Optical disc
An optical disc according to the present invention includes a plurality of recording layers; a receiving section for receiving, from outside an optical disc, a switching instruction for switching a target layer to be targeted for recording or reproducing information among the plurality of the recording layers; and a switching section for switching the target layer among the plurality of recording layers, based on the switching instruction received.
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The present invention relates to an optical disc and an apparatus for controlling tracking.
BACKGROUND ARTIn recent years, ID information is becoming more important. Experimentation on incorporating integrated circuits including ID information has been attempted. Such kinds of applications are expected to continue in the future (see, for example, Japanese Laid-Open Publication No. 2002-83482). Conventionally, a method for physically searching a portable-type optical disc which includes an IC including ID information has not been proposed.
Portable-type optical discs are dispersed after recording of the contents due to their portability. Thus, there is a demand for a method of searching for contents which have been recorded in the portable optical discs. The objective of the present invention is to provide an optical disc and a remote control device which enable searching for contents recorded on an optical disc by mounting an IC including ID information on an optical disc.
The objective of the present invention is also to provide a multi-layer disc capable of switching a target layer without applying a voltage to a conducing layer of a disc directly from outside the disc.
The objective of the present invention is also to provide an apparatus capable of controlling tracking of a laser light irradiated onto a target layer even in the case where no track is provided on the target layer.
DISCLOSURE OF THE INVENTIONAccording to the present invention, a transmitting antenna and a receiving antenna are provided in an inner peripheral portion of an optical disc, and a transmission/reception IC which stores ID information of the optical disc is connected to the antennas.
With such an optical disc, a system which can search for ID information of an optical disc from a recording/reproduction apparatus over radio waves can be provided.
According to the present invention, an optical disc includes a receiving section for receiving a switching instruction for switching a target layer and a switching section for switching a target layer based on the received switching instruction. Thereby, the optical disc can switch a target layer without applying a voltage to a conducting layer of the optical disc directly from a recording/reproduction apparatus.
The present invention achieves control of tracking of a laser light to be irradiated onto a target layer by controlling tracking of another laser light. Thereby, even in the case where no track is provided on the target layer, tracking of a laser light irradiated onto the target layer can be controlled.
FIGS. 15(a)-(c) show an operation of a tray of a recording/reproduction apparatus according to one embodiment of the present invention.
FIGS. 17(a)-(d) are diagrams showing an attachment operation of a disc according to one embodiment of the present invention.
FIGS. 24(a)-(c) are diagrams showing a method for detecting ID information according to one embodiment of the present invention.
FIGS. 27(a)-(c) are cross-sectional views illustrating a step of forming a substrate with an embedding hole according to one embodiment of the present invention.
FIGS. 29(a)-(e) are diagrams showing a positional relationship between an IC module and an information layer in a substrate according to one embodiment of the present invention.
FIGS. 30(a)-(e) are diagrams showing a step of forming an angle identification mark according to one embodiment of the present invention.
FIGS. 36(a)-(f) are diagrams illustrating a step of producing an IC module according to one embodiment of the present invention.
FIGS. 39(a)-(d) are diagrams illustrating a step of mounting a single-wound antenna and an IC.
FIGS. 40(a)-(e) are diagrams illustrating a step of mounting a multiple-wound antenna and an IC.
FIGS. 43(a)-(c) are diagrams illustrating a step of forming an IC, an antenna, and a capacitor according to one embodiment of the present invention.
FIGS. 44(a)-(c) are diagrams showing a resonance circuit according to some embodiments of the present invention.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Structure of Optical Disc)
Hereinafter, an embodiment of the present invention when applied to a recording medium having a disc shape will be described.
In an inner peripheral portion of the optical disc 1, a transmitting antenna 2 and a receiving antenna 3 are provided. The transmitting antenna 2 and the receiving antenna 3 are formed along a circumferential direction of the optical disc 1. In this example, the transmitting antenna 2 and the receiving antenna 3 are both dipole antennas.
In the inner peripheral portion of the optical disc 1, a transmission/reception IC 4 connected to the transmitting antenna 2 and the receiving antenna 3 is further provided. The transmission/reception IC 4 receives radio waves via the receiving antenna 3 and transmits radio waves via the transmitting antenna 2. In this example, the transmission/reception IC 4 is formed on a chip. The chip is called an RFID chip.
In a central portion of the optical disc 1, a hole 5 which allows the optical disc 1 to be attached to a rotation member for rotating the optical disc 1 is provided.
In an outer peripheral portion of the optical disc 1, an information layer 6, on which information can be recorded or from which information can be reproduced, is provided. The information layer 6 is formed between a substrate 7 and a transparent layer 8. An adhesive layer 9 is formed between the substrate 7 and the information layer 6.
The transmitting antenna 2 includes transmitting antenna portions 2a and 2b. The receiving antenna 3 includes receiving antenna portions 3a and 3b. The transmitting antenna portions 2a and 2b are arranged so as to have an orientation shifted by 90° from an orientation of the receiving antenna portions 3a and 3b.
The receiving antenna portions 3a and 3b are connected to the transmission/reception IC 4 via a relay substrate 11. The transmitting antenna portions 2a and 2b are connected to the transmission/reception IC 4 via wiring 10a and 10b and the relay substrate 11. The wiring 10a extends the transmitting antenna portion 2a. The wiring 10b extends the transmitting antenna portion 2b. The wiring 10a and 10b are parallel to each other.
As indicated by a cross-section along B-B′ in
When the length of the transmitting antenna portions 2a and 2b (or the receiving antenna portions 3a and 3b) of a dipole antenna is L and the wavelength is λ, L=λ/4 and λ=300/f. Thus, for a frequency of 2.4 GHz, λ=125 mm and L=31.3 mm. Accordingly, it is possible to provide the transmitting antenna 2 and the receiving antenna 3 in an inner peripheral portion of a standard optical disc having a diameter of 120 mm.
With reference to
The transmitting antenna 2 (
In an inner peripheral portion of the optical disc 1, a transmitting antenna 2 and a receiving antenna 3 are provided. The transmitting antenna 2 and the receiving antenna 3 are formed along a circumferential direction of the optical disc 1. In this example, the transmitting antenna 2 and the receiving antenna 3 are both loop antennas. The receiving antenna 3 is positioned such than it is closer to the outer periphery compared to the receiving antenna 2.
In the inner peripheral portion of the optical disc 1, a transmission/reception IC 4 connected to the transmitting antenna 2 and the receiving antenna 3 is further provided (see
When the length of the circumference of the loop antenna is L and the wavelength is λ, the antennas are set to be L=λ. Since λ=300/f, λ=125 mm. For a frequency f GHz, based on an empirical rule, a film thickness of an antenna is 2/√{square root over (f)} μm. Accordingly, when f=2.45 GHz, a film thickness of an antenna may be 1.5 μm or more.
As described above, an antenna formed along a circumferential direction of an optical disc 1 and an optical disc 1 including a transmission/reception IC 4 for transmitting/receiving radio waves via the antennas are within the scope of the present invention. An antenna which is formed on the optical disc 1 is not limited to the above-mentioned two-types of antennas (i.e., dipole antenna and loop antenna).
(Method for Obtaining ID by Remote Control)
When a view button 16 of the remote control 15 is pressed, radio waves having a particular frequency (for example, 2.45 GHz) radiate from a transmitting section 17 and a transmitting antenna 18 to the optical disc 1, as indicated by an arrow 19a. Such radio waves are received by the receiving antenna 3 of the optical disc 1 and detected by a detection section 21 of a receiving circuit 20. Thus, power 22 and a signal are obtained. The power 22 is sent to a signal generation section 23 and temporarily accumulated in a power accumulation section 24 such as a capacitor or the like. This feeble power is used to read out ID 25 in an ID number storage section 26. An ID number generation section 27 and a modulation section 28 generate a modulation signal including the ID number. The modulation signal is delayed by a time period corresponding to a time constant 30 by a time adjusting section 29. The time constant 30 is preset when the transmission/reception ICs 4 is fabricated such that every transmission/reception ICs 4 has a different time constant 30.
The ID 25 is information for identifying the optical disc 1. The ID 25 is also called ID information. The ID 25 is not limited to a number (it may be a combination of alphanumeric characters, symbols and the like). The signal generation section 23 generates a signal including ID information in response to a signal output from the receiving circuit (receiving section) 20.
The optical discs #1, #2, #3, and #4 have different response times t1, t2, t3 and t4 to the reception signal from the remote control 15. This is because the time constants 30 in the transmission/reception ICs 4 mounted on the optical discs #1 through #4 are different from each other. Thus, waveforms of the response signals from the optical discs #1 through #4 are different as shown in
The waveform of the detection signal detected by the remote control 15 is as shown in
In the remote control 15, the response signals from a plurality of optical discs 1 are separated in a time-wise manner by time separation means 32 (
Instead of presetting the time constants 30 such that every transmission/reception IC 4 has a different time constants 30, a random number generation section 34 for generating time constants at random may be provided to achieve similar effects.
The optical discs #1, #2, #3, and #4 have response signals having different amounts of shifts f1, f2, f3 and f4 in central frequencies from that of the reception signal from the remote control 15 (for example, an excitation signal having a particular central frequency). This is because the frequencies set by frequency setting sections 31 in the transmission/reception ICs 4 mounted on the optical discs #1 through #4 are different from each other. Thus, waveforms of the response signals from the optical discs #1 through #4 are different as shown in
The waveform of the detection signal detected by the remote control 15 is as shown in
In the remote control 15, the response signals from a plurality of optical discs 1 are separated with respect to the frequencies by frequency separation means 33 (
In the examples shown in
Further, in an example shown in
(Management of Disc Information by Recording/Reproduction Apparatus)
Next, with reference to
ID reproduction section 36 receives a reception signal including ID and generates ID information 37. The ID information 37 is output to a processing section 38. The processing section 38 displays the ID information 37 on a display portion 39 of the remote control 15 and transmits the ID information 37 to a receiving section 44 of a communication section 41 of the recording/reproduction apparatus 35 from a transmitting section 42 of a communication section 40. A method of communication between the communication section 40 and the communication section 41 may be an optical communication or may be a radio communication.
In the case where the communication between the communication section 40 and the communication section 41 is an optical communication, a light emitting portion for transmitting a remote control signal which is normally equipped to the remote control 15 may also serve as the transmitting section 42 and a light receiving portion for receiving the remote control signal which is usually equipped to the recording/reproduction apparatus 35 may also serve as the receiving section 44. In this case, it is not necessary to additionally provide a transmitting section 42 and a receiving section 44. Thus, a set of a transmitting/receiving unit (light receiving/emitting unit) can be omitted.
In the case where the communication between the communication section 40 and the communication section 41 is a radio communication, bidirectional communication can be performed between the communication section 40 and the communication section 41 by providing a transmitting antenna 46 and a receiving antenna 47 in the communication section 40, providing a transmitting antenna 49 and a receiving antenna 48 in the communication section 41, and using Bluetooth using radio waves of frequency 2.4 GHz or local area wireless network such as IEEE 802.11b. In this case, a transmitting antenna 46 of the remote control 15 may also serve as the transmitting antenna 18 and a receiving antenna 47 may also serve as the receiving antenna 50. Thus, a set of transmitting/receiving antennas can be omitted.
The receiving section 44 of the communication section 41 outputs the received ID information 37 to the processing section 51. In the processing section 51, a search section 52 searches a disc information file 53 and obtains disc physical property information 54, disc logic information 55 or the like corresponding to the ID information 37.
In the disc information file 53, a disc management number 57 is assigned to the ID information 37. ID information 37 is data equal to or greater than 100 bits (for example, data of 128 bits). By using disc management number 57 (for example, “04”), i.e., a virtual ID having a data amount smaller than that of the ID information 37, it becomes possible to manage IDs with smaller amount of data.
The disc information file 53 includes the disc physical property information 54 and the disc logic information 55 for each ID.
The disc physical property information 54 includes data indicating a total storage capacity 58 of the disc, a remaining capacity 59 of the disc, disc type 60 (such as rewritable type, write-once type, or ROM), the number of layers 61 of the disc (single layer or double layer) and the like.
The disc logic information 55 includes information regarding a program recorded on the disc (program information 70). The program information 70 includes property data of the program, information regarding contents, thumbnails of the contents and the like.
The program information 70a indicates program information of program 1. The program information 70a includes a program ID 71, property data 72, and contents data 86.
The property data 72 includes a start address 73, an end address 74, total recording time 75, an ID of the program coming after the current program (program ID of link destination) 76, time to start and finish recording (recording time) 77, a recording source or a TV channel number 78, a program title 79, property information of the contents of the program 80 (a category of the program 81, a name of the characters appearing in the program 82, an area 83, program contents 84 and the like). Furthermore, in the case of a program linked to a web site, the property data 72 further includes an address of a web site of a link destination (URL) 85.
The contents data 86 includes a still picture 87 (for example, a still picture in JPEG format or the like of the first scene of program 1) and motion picture data 88 for first few seconds (a low-resolution motion picture 89 in MPEG 4 format or the like and a representative screen (thumbnail) of a high-resolution motion picture 90 at a high rate in MPEG 2 format or the like. The contents data 86 may include thumbnail data 91 which is a collection of the thumbnails.
With reference to flow charts of
In step 95a, the recording/reproduction apparatus 35 waits to obtain the ID information that is to be sent from the remote control 15. In step 95b, the recording/reproduction apparatus 35 obtains new ID information which is different from the current ID information it has. Then, in step 95c, the processing section 51 defines the new ID information as the n-th ID information (i.e., ID(n)). In step 95d, the processing section 51 searches the disc information file 53 (
For example, in the case where the motion picture of a thumbnail of the program is displayed on the display portion 39 of the remote control 15, motion picture data is sent from the recording/reproduction apparatus 35 (server) to the remote control 15. The processing section 51 reads out motion picture data showing a thumbnail of program 1 (for example, motion picture data for the first 5 seconds of program 1) from the disc information file 53 and sends it to the remote control 15. The motion picture data is, for example, low-resolution motion picture data 89 of MPEG 4 grade. The processing section 38 receives the motion picture data and displays it on the displaying portion 39 (
In step 95q, in the case where the next image display request is issued, or a previous screen display request is issued by the user pressing a previous screen button 102 of the remote control 15, if m is the last in step 95y, the process returns to the first step 95a and the recording/reproduction apparatus 35 waits to obtain the next ID information. Thereafter, the same operation as described above is performed.
In this embodiment, normal quality images and low resolution motion picture 89 are both recorded in the disc information file 53. However, only normal quality images may be recorded in the disc information file 53. In this case, when a normal quality image is output, by performing rate conversion for a normal quality image (for example, MPEG2 image of 6 Mbps), the low-resolution motion picture 89 (for example, MPEG 4 image of 384 kbps) may be obtained and the low-resolution motion picture 89 may be sent to the remote control 15.
(Operation when an Image is not Displayed on Remote Control)
If it is determined “No” in step 95f (i.e., when an image is not displayed on the remote control 15), the process proceeds to steps 96a through 96c shown in
For displaying the program list on the display portion 39 of the remote control 15, as shown in
With reference to the flow chart of
In step 96h, the processing section 38 determines whether or not displaying the property data or the program list is completed and continues displaying the property data or the program list until displaying the property data or the program list is completed (
(Operation Linked with Other Machines)
In step 95r, the processing section 51 determines whether or not it is possible to connect to other machines or servers. If it is determined “No” in step 95r, the process proceeds to step 95u. In step 95u, the processing section 51 sends a message of “No data” or information indicating the message to the remote control 15 via the communication channel and displays the message or the information indicating the message on the display portion 39. If it is determined “Yes” in step 95r, in step 95s, the processing section 51 connects to another submachine 35a via the communication section 41, a communication channel 283 and a communication section 41a. The communication channel 283 may be wired or wireless, or may be the internet 284 as shown in
If it is determined “No” in step 95v (i.e., if the remote control 15 cannot display the image), the process proceeds to step 96j′ of
(Method for Reducing Time Loss During Recording/Reproduction in Recording/Reproduction Apparatus)
Next, with reference to the flowchart of
As shown in
The main unit antenna 110 transmits radio waves periodically or when the tray 113 is slid out (step 111a). Thus, when the optical disc 1 on which an ID chip is mounted is brought near the tray 113 (step 111b), ID information of the optical disc 1 is read out by radio waves transmitted from the main unit antenna 110. It is determined whether reading out the ID information of the optical disc 1 is completed (step 111c).
When the optical disc 1 is set in the tray 113, the set signal is turned ON (step 111d). When the set signal is turned ON, the tray antenna 112 transmits radio waves (step 111e). By the radio waves transmitted from the tray antenna 112, the ID information of the optical disc 1 is read out. It is determined whether reading out the ID information of the optical disc 1 is completed (step 111f).
At this step, it is recognized which of the optical discs 1 will be inserted into the recording/reproduction apparatus 35 for reproduction or recording. Thus, the reproduction or recording can be started using data in the disc information file 53 in the recording/reproduction apparatus 35.
After reading out the ID information is completed, the tray 113 is stored as shown in
As shown in
If the optical disc 1 is used in the recording/reproduction apparatus 35 for the first time, the ID information 37 read from the optical disc 1 by radio waves and optical ID information 115 optically read from the BCA are recorded in the disc information file 53 as shown in
In step 111s, a still picture image encoder 131 (
With reference to a flow chart of
Next, the data read out from the optical disc 1 is output. More specifically, in step 119r, the tray 113 is stored and the reproduction of the optical disc 1 is started. The optical ID information of the optical disc 1 is optically read out from the optical disc 1, and, in step 119t, it is verified whether the optical ID information and the radio wave ID information match or have a particular relationship. If it is determined “No” in step 119t, the optical ID information is given a higher priority, and, if there is a disc information file corresponding to the optical ID information, a thumbnail therein is output. If there is no disc information file corresponding to the optical ID information, the process is held until a signal from the optical disc 1 is obtained (step 119u). In step 119v, it is determined whether the reproduction of the optical disc 1 is started. In step 119w, it is prepared for the switching an output signal from the signal read out from the disc information file to the reproduction signal from the optical disc 1. Switching of the output signal is performed so that a time stamp of the signal read out from the disc information file matches a time stamp of the reproduction signal from the optical disc 1. In step 119x, the output signal is switched at the same time and at an interval of GOPs (step 119y). The reproduction is started in a normal reproduction mode (step 119z).
If it is determined “No” in step 119h in
In step 120, it is determined whether the optical disc 1 has been recorded one time or more, and thus, the disc information file has already been obtained. If it is determined “Yes” in step 120, in step 120a, a procedure of storing the tray 113 and recording to the optical disc 1 is started. In step 120b, the media ID and the cryptographic key block corresponding to the ID is read out from the disc information file. In step 120c, coded information, which is coded contents information, is encrypted using the media ID and the cryptographic key block read out from the disc information file to create a code. In step 120d, the code is temporarily recorded in a memory other than the optical disc, such as an IC. In other words, the code is recorded in an IC or HDD during a preparation time (normally, 30 seconds to 1 minute) for recording to the optical disc 1. In step 120e, the ID information of the optical disc 1 (referred to as optical ID information) is optically read. In step 120f, it is determined whether the optical ID information and the radio wave ID information matches or have a particular relationship. If it is determined “No” in step 120f, the process proceeds to step 120g and the optical ID information is used in precedence. The tray 113 is slid out and the radio wave ID information is read out again. Then, the optical ID information and radio wave ID information are verified. If the verification result is satisfactory, the code is restored to the original coded information, and, by using the media ID and the cryptographic key block of the disc information file 53 corresponding to the optical ID information, the coded information of the contents is encrypted again to create a code. If it is determined “Yes” in step 120f, it is determined whether preparation for recording to the optical disc is finished or not in step 120h. If it is determined “Yes” in step 120h, the rotational velocity of the optical disc 1 is set to be double-speed or higher in step 120i. In step 120j, the code recorded in a memory such as an IC or the like is recorded to the optical disc 1 from the start time.
(Method for Creating Thumbnails of Disc Information File)
In step 120k, an image for a certain amount of time or a still picture of low-definition coded information which is contents coded at a bit rate lower than that for the above coded information is recorded in the disc information file as a thumbnail.
In step 120m, when the recording rate to the optical disc 1 is SR and the rate of input signal is SI, recording is performed for a certain amount of time with SR>SI maintained. In step 120n, time information tR of the contents currently recorded in the optical disc 1 and time information tI of the contents which are currently being input are compared. If tI>tR in step 120p, the process returns to step 120m. If tI=tR, approximately (i.e., a difference between tI and tR is 1 to 2 frames), in step 120q, the contents are directly recorded to the optical disc 1. In step 120r, when recording rate of the optical disc is SR and the rate of the input signal is SI, SR≈SI. Then, normal recording is performed in step 120s.
(Method for Searching Corresponding Disc ID)
Next, a method for searching desired disc ID information and further physically locating the disc by using property information of the disc information file will be described.
First, in step 135a of
(Method for Physically Searching Optical Disc)
With reference to the flow chart of
In step 136a, a question “Search for disc?” is displayed on the display portion. In the case of searching for a disc (i.e., when it is determined “Yes” in step 136b), radio waves for a search are transmitted in step 136c. For example, as shown in
(Method for Updating Disc Information File)
A method for updating a disc information file in the case where a plurality of recording/reproduction apparatuses are used in one household.
As shown in
More specifically, in step 143b of
In step 143g, it is determined whether data of disc information files of discs different from the inserted optical disc are recorded in the disc information file region 144. If it is determined “Yes” in step 143g, it is determined whether the disc information files regarding the discs are new compared with the disc information file of the main unit (step 143h). If it is determined “Yes” in step 143h, the data of the main unit is replaced with data of the disc for only a disc information file of a disc of a particular ID (step 143i). The data reliability flag of the disc information file of another disc replaced in step 143i is set to 0 (low) (step 143j). In this way, every time a disc is inserted into apparatuses, data of the disc information file is updated.
(Method for Fabricating Antenna)
A method for fabricating an antenna according to the present invention includes a first method of first creating an IC module, in which an IC, antennas, components such as capacitors or the like and wiring are integrated, and then fixing the IC module onto a disc substrate by adhesion or the like, and a second method for directly forming antennas or wiring, or a capacitor on a disc substrate. First, the module method is described.
(Method for Fabricating Antenna in Module Scheme)
A skin depth of an antenna will be 8 μm and 0.6 μm when transmitting/receiving frequency is 13.5 MHz or 2.5 MHz, respectively. In order to efficiently receive radio waves of 13.5 MHz, the thickness of the antenna has to be 8 μm or greater. Thus, forming an antenna portion by a thick film process such as an electrolytic plating used in the normal fabrication process of a print substrate is suitable for this application, which requires sensitivity. The process is as follows. First, a substrate 7 which has an embedding hole for embedding an IC module is created. The substrate 7 may be used as a substrate for an optical disc. Separately, an IC module 201 is created and the IC module 201 is embedded in the embedding hole in the substrate 7. In the case of an optical disc of a type in which two substrates are bonded, after the two substrates are bonded, a label printing is performed to complete the optical disc.
With reference to
The IC module 201 is formed on the substrate 7 on a side of the information layer 6.
As shown in
In an optical disc in which two substrates are bonded, if the information layer 6 is formed on only one substrate, the other substrate 215 does not have an information layer 6. In this case, as shown in
Next, a method for fabricating the substrate 215a will be described with reference to
(Formation of Angle Identifying Mark)
In the conventional type optical disc, it is not necessary to specify the orientation of the substrate of the optical disc. Thus, the optical disc has no mark for identifying an angle and merely has means for recognizing characters and symbols on the substrate. Thus, a high precision for detecting an angular position cannot be achieved. In the present invention, in the case of mounting the IC, antennas or components on the substrate, the angular position has to be adjusted with high precision. Therefore, as shown in
As shown in
(Description of IC Module)
A process for fabricating the IC module 201 will be described with reference to
A wiring substrate 234 having a thin sheet shape of 10 to 20 μm, such as a flexible substrate is prepared. More specifically, a plurality of wirings are created together using a sheet having a large area, and then, after completion, the sheet is punched into doughnut-shapes as shown in
With reference to
(Method for Attaching IC Module)
A method for attaching the IC module 201 to the embedding hole 202 of the substrate 7 of the optical disc shown in step 1 of
(Method for Mounting Non-Flat IC Module)
A method for making the substrate surface flat after embedding by previously providing an embedding hole having protruded and recessed portions on the substrate 7 side has been described above. Hereinafter, a method of forming a flat embedding hole 238 in the substrate 7 will be described. As shown in
Furthermore, the IC 230 and the antenna 231 are formed on the print substrate 234 such that the volume of the IC module 201 within the range of d11 (i.e., a total sum of the volume of a portion of the IC module 201 protruding from a surface of the substrate 7 to be bonded) and the volume of a gap portion except for an antenna or IC within the range of d12 (i.e., a total sum of the volume of a gap portion which is recessed with respect to the surface on which the substrate 7 is bonded) are about the same. With such a structure, if an adhesive 236 is enclosed in a step of bonding the substrate 7 and the substrate 218 shown in step 3, when the volumes are averaged, they are even out to be zero. Thus, the embedding portion of the IC module 201 can be regarded equivalently that it has the same height as the surface on which the substrate 7 is bonded. Since they have equivalently the same heights, the same volume of the adhesive is enclosed in the IC module region, the substrate portion, and the portion of the information layer 6. Thus, the adhesive 236 is distributed with a uniform thickness. This provides an effect that the thickness of the adhesive layer 216 becomes uniform. In such a structure, an alignment in an angular direction is not necessary. This eliminates not only the need for an angle identifying mark but also a step for aligning in an angular direction.
(Method for Attaching IC to IC Module on Disc Substrate Side)
As shown in
As described with reference to step 2 of
The IC module produced as described above is mounted into the embedding hole on the side on which the substrate is bonded and the substrates are bonded. Firstly, the IC module can be protected by the adhesive layer without providing a special step for forming a protection layer, and thus, the effects that the number of steps for forming a protection layer can be reduced and the reliability of an environmental resistance is improved, are obtained. Furthermore, since the IC module is at about 0.6 mm or 1.1 mm inside the disc, the effect that the IC module is prevented from being destroyed by a mechanical contact from outside the completed bonded disc, is provided. Similar effects can be obtained by a method for directly forming an antenna which will be described below.
(Method for Directly Forming Antenna: Single-Wound Type)
A method for producing an IC module and attaching the IC module to an embedding portion of the substrate has been mainly described above. Hereinafter, a method for forming an antenna directly on a disc substrate will be described. A skin depth of an antenna will be 8 μm and 0.6 μm for 13.5 MHz or 2.5 MHz, respectively. Thus, for 2.5 GHz, an antenna can be formed by a thin-film method such as sputtering or the like. For 13.5 MHz, as shown in
With reference to
In step 1 of
With reference to
In step 3 of
In a method for forming a thin film by sputtering or the like, an antenna conductor having a thin thickness in the order of sub-micron is formed. Thus, when a low frequency is used, the thickness of the antenna conductor does not reach the skin depth and the transmission/reception efficiency of the antenna may be deteriorated. In the case where such a low frequency is used, for example, the antenna conductor may be treated with electrolytic plating or electroless plating without electrodes. The electrolytic plating may be performed by, for example, attaching electrodes to the antenna conductor and covering other metal portions, and/or recording film portions with a protection film, and immersing the antenna conductor into an electrolytic solution and then placing it into an electrolytic plating bath. By treating the antenna conductor with electrolytic plating or electroless plating without electrodes, a thickness of the antenna conductor can be increased and the thickness of the antenna conductor will become close to the skin depth. By adding such a plating step after the step of forming a thin film, the thickness of the antenna conductor can be increased. As a result, it becomes possible to improve the transmission/reception efficiency of the antenna.
(Method for Forming Antenna after Attaching IC)
As shown in
(Method for Directly Forming Multiple-Wound Antenna)
In the previous section, an embodiment of the single-wound antenna has been described. For 2.5 GHz, the single-wound antenna does not cause any problem. In the case of 13.5 MHz, the sensitivity is deteriorated. For an application which requires a higher sensitivity, a multiple-wound type antenna wound for n times is required.
The method is described in more detail with reference to the cross-sectional views shown in
Such a winding arrangement of the antenna provides an effect that the antenna can be accommodated within a smaller circle. In an optical disc, the recording region starts at a diameter of about 23 mm. Thus, only a narrow region from the inner periphery to a central hole can be utilized as an antenna area. Thus, forming bent regions provides a significant effect for an optical disc because an antenna having a larger number of windings can be accommodated.
(Method for Forming Circuit or Part of Components by Utilizing the Step of Formation of Recording Disc)
In a recording-type disc, a recording region is formed by film formation steps for 6 to 8 layers. These layers include a metal layer which reflects a light and has a high electric conductivity. There is also a plurality of layers for adjusting absorption of light. These layers are insulators having low electric conductivity. Further there is a semiconductor layer. The semiconductor layer is formed by a sputtering method. The semiconductor layer can also be formed by evaporation. The present invention is characterized in that an antenna, capacitor, resistance, and wiring are formed in the same step by utilizing film formation steps of the metal layer, dielectric, and semiconductor. Thus, production in a short time and at a low cost can be implemented by omitting a part or all of the steps for an antenna, wiring and the like.
For example, at least a part of an antenna can be formed by utilizing a film formation step for a metal reflection film included in an information layer on/from which information can be recorded/reproduced. In this case, a metal reflection film and an antenna are formed such that the thickness and the composition of the metal reflection film are substantially the same as the thickness and the composition of at least a part of the antenna.
With reference to
(Fabrication Step of Multiple-Wound Antenna and Capacitor)
With reference to
As shown in
In this way, at least a part of the antenna 231 is formed by utilizing film formation steps of metal reflection films included in the information layer. In this case, the metal reflection film and the antenna are formed such that the thickness and the composition of the metal reflection film are substantially the same as the thickness and the composition of at least a part of the antenna 231. Further, at least a part of the capacitor 263 is formed by utilizing the film-formation step for a dielectric film included in the information layer. In this case, the dielectric film and the capacitor 263 are formed such that the thickness, and the composition of the dielectric film, are substantially the same as the thickness and composition of at least part of the capacitor 263.
(Capacitance of Capacitor)
The capacitor 263 is formed for producing a resonance circuit as shown in
(Fabrication Method of Antenna Portion)
(Fabrication Method for Another Resonance Circuit)
By using the structure shown in
(Method for Fabricating Antenna and Reflection Film in the Same Step)
With reference to
By using the mask 260f as shown in
(Fabrication Method for Thin Film Antenna)
(Structure and Operation of Remote Control)
The structure of the remote control 15 which is described with reference to
Since the remote control 15 is mounted with a battery of a small capacity, it is necessary to limit an operation of the circuit for transmitting an RF signal as small as possible. The method shown in
(Application to Multi-Layer Disc)
An embodiment in which the present invention is applied to a multi-layer disc will be described.
The antenna 231 is connected to the IC 4. The IC 4 is connected to conducting layers 303a, 303b, 303c, 303d, 303e contained in the information layer 6, respectively via wirings 302a, 302b, 302c, 302d, 302e, etc., shown in
Each of the conducting layers 303a-303e is provided adjacent to at least a corresponding one of the plurality of recording layers 301a-301d, therefore each recording layer is sandwiched by the conducting layers provided immediately above and immediately below it. The wirings and the films are required to be disposed in a precise angular direction in order to manufacture the optical disc 1. In order to achieve the manufacturing, a high positional precision for the angular direction can be obtained by using an angle identifying recessed portion 220 and an angle identifying protrusion 221 shown in
The recording/reproduction apparatus 35 includes a control section 373, a focus control section 375, a transmitting section 17, a receiving section 32, an input section 17a, an output section 32a, a frequency separation section 360, a power supply generation section 22b and an antenna 18. A switching instruction 374 output from the control section 373 is transmitted to the IC 4 via the input section 17a, the transmitting section 17, the frequency separation section 360 and the antenna 18. A communication system between the recording/reproduction apparatus 35 and the IC 4 may be an electrical wavelength communication or may be an optical communication. In the case where the communication is an the optical communication, the recording/reproduction apparatus 35 and the IC 4 respectively include a light emitting section and a light receiving section for the optical communication.
(Method for Switching a Target Layer)
A signal (activation signal) for switching multi-layer films, where m number of films are present, the multi-layer films being applied with a voltage, is supplied to the multi-layer films from the layer-switching signal generation section 311 (
In the present embodiment of the present invention, a voltage is applied to the target layer so as to activate the target layer. However, energy for switching between the activation and non-activation for each layer is not limited to power (voltage). For example, optical energy can be used. In this case, each layer is formed with materials which are activated when the optical energy is supplied thereto. In the embodiment of the present invention, a state of a layer on which recording or reproducing information can be performed depending on whether external energy (for example, power (voltage) and light) is applied or not is referred to as an active state. A state of layer on which recording or reproducing information can not be performed regardless of whether external energy is applied or not is referred to as a non-active state. In the present embodiment, at least a portion of the plurality of recording layers is switched between the active state and the non-active state in response whether an activation signal is applied thereto or not.
A method of switching a target layer will be described in further detail as an example when the information layer 6 includes solid electrolytes with reference to
A layer LK (Kth layer) which is one of the plurality of the multi-layer films includes, from the top of
In a state of
The mark 314 in the layer LK indicates a strong absorption and the other recording layers indicate a weak absorption. This is because since the Fabry-Perot resonator is formed due to the presence of the reflection layer 307 and the light repeatedly passes through the recording layer 301c, an amount of light absorption by the recording layer 301c is increased. If there is the absence of the reflection layer 307, the amount of the light absorption by the recording layer 301c significantly decreases since the Fabry-Perot resonator is not formed. When an inverse voltage, i.e., a plus voltage +V1 (activation signal) is applied between the conducting layer 305a and the conducting layer 304a as shown in
When both the layer LK and the layer LK−1 are deactivated, a significant recording light reaches a first layer L1 of the bottom layer as shown in
Since the reflection layer 257 included in the first layer L1 is fixed, there is no forming or deleting cycle of the reflection layer as in the case of other layers. Thus, the reflection layer 257 does not deteriorate at all. The number of times that information can be written on the first layer L1 is more than one million times similar to a normal RAM disc. Therefore, if the first layer L1 is set as a reference layer, and frequently rewritten data such as FAT data file and management information for data address structure information for each layer is recorded on the first layer L1, the number times information can be rewritten on the optical disc can be substantially increased.
When the reflection layer 307 vanishes by removing the solid electrolyte layer 308, the recording layers included in the layer LK and the layer LK−1, etc., are formed with an electrochromic material so as to be a mark destroying type of write-once recording layer. In this case, the FAT information is required to be re-written for each additional recording. If only the first layer is a writable layer, a disc combining a plurality of write-once (W/O) layers with one layer of a rewritable layer is achieved. In this case, when the FAT, the data structure, recorded-area and unrecorded-area information, etc., are recorded on the first layer, there is an effect that wasteful consumption of recording capacity by recording additional management information together with a change of data such as the FAT the W/O layer can be reduced.
The recording layer 301c in
(Light Absorption due to a Change of Light Absorption Edge)
The recording layers 301a-301d are formed with materials having changeable electrooptical properties of which band gaps and light absorption edges respectively change due to application of voltage. In this case, the recording layer is set so as to not absorb the recording light with the wavelength λ when no voltage is applied thereto and absorb the recording light with the wavelength λ when a voltage is applied thereto due to a change of a light absorption edge. Alternatively, the wavelength λ is adjusted depending on the characteristic of the recording layer. When a recording light with the wavelength λ is used, the light is not absorbed when the voltage V2 is not applied to the recording layer 301c as shown in
An example where a multi-layer film includes a layer having changeable optical properties will be described with reference to
An example where a multi-layer film includes a layer having changeable optical properties will be described in further detail with reference to
When the voltage V1 is applied to the recording layer 310 and the layer having changeable optical properties 315a and the voltage V2 is applied to the layer having changeable optical properties 315, the refractive indexes of the layer having changeable optical properties 315 and the layer having changeable optical properties 315a are changed from n2 and n5 to n22 and n55, respectively, as shown in
Information can be reproduced as shown in
(Hybrid Disc with a Combination of One-Layer (or Two-Layer) Region and a Multi-Layer Region)
An optical disc 1 shown in
A method of recording/reproduction information on/from a hybrid disc is described with reference to
The layer LK shown in
In the case where data is recorded on the recording mark 314, it is required to update file management information such as FAT or VAT. A hybrid disc with a combination of a multi-layer and one-layer according to the present invention shown in
As a system of electrically switching a target layer (activation layer), it is considered that an electrochromic material or an electrodeposition material known as a display material, or liquid crystal material, etc., is used. In the case of this system, several hundreds of milliseconds are required for switching a target layer. Also during the switching operation of a target layer, the reflection rates and absorption rates of the target layer become unstable, thereby resulting in the instability of focusing. Therefore, there is a possibility that the optical head can collide with the opposing surface of the optical disc and receive damage. In the case of the present invention, the optical head is positioned such that light is focused on a first layer of the second region during the switching operation of a target layer. Thereby, damage to the optical head can be prevented.
The reference-layer region can be always activated regardless of application of voltage thereto. In this case, the reference-layer region is, for example, formed with amorphous materials.
A reference-layer region can be formed with a material which is activated when no voltage is applied thereto and which is deactivated when a voltage is applied thereto. In this case, a voltage is applied to the reference-layer region from the switching signal generation section 311 as necessary. Even in an optical disc in which a reference-layer region overlaps other recording layers, the reference-layer region is deactivated when the other recording layers are accessed. Thereby, attenuation of a laser light to the other recording layers due to the reference-layer region does not occur.
(Configuration of a Hybrid Disc)
A guard region 317 is provided between a first recording region 316 and a second recording region 318 in an optical disc in
In an optical disc 1 shown in
A recording layer located at the second region 318 of the outer peripheral portion can be only one layer as shown in
A description of an embodiment in which the second region 318 has a single recording layer is given. However, a second layer is a semi-transparent film (which is the same as the second layer of a two-layer optical disc) and is formed with almost same material as the first layer, so that two RAM layers (recording layers of the second region 318) are formed. In this case, a recording capacity for the second region is increased to about twice as much without reducing the number of times that rewriting is possible.
First, a disc is mounted on a recording/reproduction apparatus (step 323a). A focus is adjusted onto a ROM section or a RAM section of a first layer of a second region (step 323b). Property information (total number of disc layers, capacity for each layer, inherent ID, RAM for each layer, property information of W/O, the layer number of the defective layer, the layer number of any layer in which a defect can occur, etc.) of the disc and a cryptographic key for controlling an unauthorized duplication of the disc are read from the RAM section or ROM section in the first layer of the second region, or a memory 25a in the IC 4 (step 323d).
When a recording instruction to a layer LK is received in step 323e, the process proceeds to step 323f. There, a check is performed to determine if the layer LK is an unrequired layer. If so, the layer LK is newly defined as a reserve layer h (step 323g). A check is performed to determine if the layer LK is a potentially defective layer in step 323h. If so, all the data contained in the layer LK is moved to a reserve layer j, and the j layer is redefined as a layer LK (step 323i). Thereafter, the process proceeds to step 323j, and file management information (such as FAT, VAT, UDF) of the layer LK is read from the second region, so that an ending point of at least the last recorded data and information of an effective layer (target layer) are obtained so as to identify the target layer. A check is performed to determine in step 323k if the effective layer is the layer LK. If not, the process proceeds to a routine of switching to the layer LK in step 323v.
An instruction to “apply a voltage to the layer LK” is transmitted via a coil 231 to the optical disc from the recording/reproduction apparatus 35 shown in
The optical head is moved to the second region in step 324a. There, a focus is adjusted onto the first layer of the second region (step 324c) without switching a target layer (step 324b). File management information (such as FAT, VAT, UDF, TOC, last recorded address layer information), etc, is recorded on an RAM region of the second region 318 in step 324d. Next, the file name, information necessary for searching a file of property information and the like, a video thumbnail or compressed or uncompressed starting information indicating first 5 to 10 seconds of motion video is recorded on the second region (step 324e).
When next instruction of recording data is received (step 324f), the optical head is returned to the first region. There, data is recorded on the layer LK, and layer information indicating that this layer is the layer LK is recorded on the layer LK (step 324g). When an instruction of recording data on the layer LK+J is received (step 324h), the optical head is returned to the second region 318 (step 324i). There, a routine of switching to the layer LK−1 is performed, and information of switching to the layer LK+J is transmitted to the disc (step 324p). Thereafter, a voltage is applied to layers adjacent to the layer LK+J (step 324q). When a certain amount of time has passed, or the layer-switching completion information is received from the disc (step 324r), the flag is set to “1” (step 324s). Thereafter, the process proceeds to step 324j, and there, file management information of the layer LK is recorded on the first layer (can be second or third layer if any) of the second region 318. When the recording is completed (step 324k), the process proceeds to step 324n since the flag is set to “1” in step 324m due to the completion of switching a target layer. There, focus is adjusted onto the layer LK+J of the first region, and the process proceeds to step 325a in
Data is recorded on the layer LK+J in step 325a. When the recording is completed (step 325b), the optical head is moved to the second region so as to record the management information (step 325c), and then, the processing is completed (step 325d). When an instruction for reproducing data from the layer LK+J is received in step 325e, first, the file management information (such as FAT) of the layer LK+J of the second region is reproduced (step 325f), and thereafter, the optical head is moved to the first region so as to reproduce data from the layer LK+J (step 325g).
When an instruction for reproducing data from the layer LK is received in step 325h, an effective layer (target layer) is switched from the layer LK+J to the layer LK due to a routine of switching to the layer LK at aforementioned step 323v. The optical head is moved to the second region. Focus is adjusted onto the first layer (step 325i). The management information of the layer LK is obtained (step 325j). Thereafter, the currently effective layer, i.e., the layer LK, is set as a target layer, on which the management information is recorded on the second region (step 325k), and A check is performed to determine if the flag is set to “1” in step 325m, i.e., the effective layer has been switched to the layer LK. If the optical head is moved to the first region or have been already moved to the first region, the focus is adjusted onto the first region, and, then the data is reproduced from the layer LK (step 325n). When the reproduction is completed in step 325p, a check is performed to determine if the state of the layer should be checked in step 325q. If “Yes”, in step 325r, an instruction of checking the layer is transmitted to a microcomputer 367 (
(Method for Tracking)
The optical disc 1 shown in
The recording/reproduction control section 337 controls recording information on a predetermined recording layer (e.g., recording layer 301e) or controls reproducing information from the predetermined recording layer. A control signal output from the recording/reproduction control section 337 is divided by the time division section 351 as necessary, and the divided control signals are sequentially input to the first through third optical head sections 377, 378, 379. Each optical head section includes a laser emitting section, optical components (lens, polarization plate, beam-splitter, etc.) and an actuator, etc.
The signal generation section 376 uses the time-division section 352 and the polarization separation section 353 to separate the reflection light received from the optical disc via each optical head section so as to generate a focusing error signal and a tracking error signal for each light separated. The signals thus generated by the signal generation section 376 are sequentially input to the first through third focusing control sections 329, 334, 336 and the first through third tracking control sections 330, 333, 339.
The first focusing control section 329 controls focusing of the first laser light 328 output from the first optical head section 377. The first tracking control section 330 controls tracking of the first laser light 328. The second focusing control section 334 controls focusing of the second laser light 332 output from the second optical head section 378. The second tracking control section 333 controls tracking of the second laser light 332. The third focusing control section 336 controls focusing of the third laser light 335 output from the third optical head section 379. The third tracking control section 339 controls tracking of the third laser light 335.
A tracking method of recording information on a predetermined recording layer (e.g., recording layer 301e) or reproducing information from the predetermined recording layer will be described. A track 331 for tracking information is provided on the uppermost layer of the optical disc 1, which is referred to as a tracking layer 327. Herein, the target layer on which recording or reproduction is performed is a recording layer 301e.
First, the first laser light 328 is irradiated onto the track 331 contained in the tracking layer 327 by using the first focusing control section 329 and the first tracking control section 330. Thereby, recorded addresses or track numbers are reproduced by wobbling continuous grooves, etc. The second laser light 332 is irradiated onto the track 331a contained in the lowermost recording layer 301l by using the second focusing control section 334 and the second tracking control section 333. Thereby, recorded addresses or track numbers are reproduced by wobbling continuous grooves, etc. Since the first laser light 328 and the second laser light 332 possess the same polarization angle θa and both are also modulated with time-division, the first laser light 328 and the second laser light 332 can be separated with the time-division. Address information is readily separated since it is indicated by frequency components in a low bandwidth.
The third laser light 335 is irradiated onto the recording layer 301e of the target layer by using the third focusing control section 336. Since the third laser light 335 possesses a polarization angle, 90° different from the polarization angle θa, the reflection light of the third laser light 335 can be optically separated from the reflection lights of other laser lights by using a polarization filter/polarization mirror included in the polarization separation section 353. Thereby, the focusing of the third laser light 335 and recording/reproduction on/from the recording layer can be performed. The focus of the third laser light 335 has a predetermined positional relationship with the focus of the first laser light 328 and the focus of the second laser light 332.
According to this method, first, tracking of the first laser light 328 and the second laser light 332 is controlled. The laser light 335 is controlled such that the focus is positioned at P2/(P1+P2) on a straight line 338 which connects the track 331 and the track 331a. The P1 represents the number of layers from the tracking layer 327 to the recording layer 301e (the recording layer 301e not included). The P2 represents the number of layers from the recording layer 301e to the recording layer 301l (the recording layer 301l not included). In the example shown in
(Four-Beam Tracking System)
The apparatus 380a includes first through fourth optical head sections 377, 378, 379, 344, first through fourth focusing control sections 329, 334, 336, 346, first tracking control section 330, a fourth tracking control section 345, a recording/reproduction control section 337, a time division section 351 and signal generation section 376. Similar to other optical head sections, the fourth optical head section 344 includes a laser emitting section, optical components (lens, polarization plate, beam-splitter, etc.) and an actuator, etc. The fourth focusing control section 346 controls focusing of the fourth laser light 348 output from the fourth optical head section 344. The fourth tracking control section 345 controls tracking of the fourth laser light 348. In the optical disc 1 shown in
A four-beam tracking method of recording information on a predetermined recording layer (e.g., recording layer 301e) or reproducing information from the predetermined recording layer will be described. The first laser light 328 is irradiated onto the track 331 on the tracking layer 327 by using the first focusing control section 329 and the first tracking control section 330. Focusing the second laser light 332 and the third laser light 335 are controlled by using the second focusing control section 334 and the third focusing section 336 such that the focuses of the second laser light 332 and the third laser light 335 are adjusted onto the tracking layer 327. The first through third laser lights possess the same polarization angle θa, so that the first through third laser lights can be optically separated from the fourth laser light 348. Since the first through third laser lights can be emitted in a low frequency, the first through third laser lights are controlled with time-division by using the time division section 351 so as to be emitted. Thus, respective reflection lights of the laser lights can be separated from one another by the time separation section 352. Therefore, tracking and focusing the reflection lights can be controlled independently from one another. The fourth laser light 348 possesses a polarization angle, 90° different from the polarization angle θa. The fourth laser light 348 is irradiated by the fourth focusing control section 346 such that the focus of the fourth laser light 348 is adjusted onto a recording layer 301h. The fourth laser light 348 has a predetermined positional relationship with the first through third laser lights 328, 332, 335, respectively
According to the four-beam tracking method, the fourth tracking control section 345 controls the fourth laser light 348 such that the optical axis of the fourth laser light 348 is vertical to straight lines passing through F, C and E. Herein, F represents the focus of the third laser light 335. C represents the focus of the first laser light 328. E represents the focus of the second laser light 332. When the respective focuses of the first through third laser lights 328, 332, 335 are adjusted onto the tracking layer 327, the focus of the fourth laser light 348 scans a virtual track. That is, when focusing of the first through third lights 328, 332, 335 and tracking of the first laser light 328 are controlled, tracking of the fourth laser light 348 can be controlled.
In this case, focusing error between the second laser light 332 and the third laser light 335 is about 0.2μ. When the distance between the tracking layer 327 and the lowermost layer of the recording layer is denoted as d, the width w between the second laser light 332 and the third laser light 335 is required to be w>d. In the case with this condition, the track error is 0.2 to 0.3μ. As a result, a margin with the next track can be secured. Since the first through third laser lights 328, 332, 335 possess a different polarization angle from that of the fourth laser light 348, the first through third laser lights 328, 332, 335 and the fourth laser light 348 can be separated from each other by using the polarization separation section 354. Therefore, focusing control of the fourth laser light 348 and the recording/reproduction on/from the recording layer with the fourth laser light 348 can be performed independently from the other laser lights.
Irradiation with the second laser light 332 can be omitted. Only focusing of the first laser light 328 and the third laser light 335 and tracking of the first laser light 328 can control tracking of the fourth laser light 348.
(Circuit Operation Within a Recording Medium)
As shown in
A potentially defective layer detection section 326 applies DC or AC voltage to each layer to measure resisting value or impedance so as to check the insulative properties thereof, so that the potentially defective layer detection section 326 determines layers which have lower values for certain insulative properties as potentially defective layers and sends the result data thus determined to the microcomputer so as to accumulate the result data in a memory 25a. Data (such as, total number of layers, the layer number of the current target layer, number of layers on which information is recorded, the layer number of the defective layer, disc ID) including this data contained in the memory 25a is transmitted to the recording/reproduction apparatus 35 via the coil 231 from the demodulation circuit 365 and the transmitting section 366. The data can be transmitted through radio as in the case of the aforementioned RF-ID operation. Alternatively, the data can be transmitted together with the disc ID as in the case of the RF-ID operation. The RF-ID section 368 includes a demodulation circuit 365a. Phase change, a destruction type and color changing type recording methods have been described as methods of recording marks. However, other recording methods, such as optical magnetic recording can be used as a method of recording marks.
At least the following items are within the scope of the present invention.
A1 An optical disc including: a plurality of recording layers; a receiving section for receiving, from outside the optical disc, a switching instruction for switching a target layer to be targeted for recording/reproducing information among the plurality of the recording layers; and a switching section for switching the target layer among the plurality of recording layers, based on the received switching instruction.
A2 An optical disc according to A1, further including a plurality of conducting layers, wherein each of the plurality of conducting layers is provided adjacent to at least one corresponding recording layer of the plurality of recording layers, and the switching section adjusts voltages being applied to each of the plurality of conducting layers so as to switch the target layer.
A3 An optical disc according to A1, wherein the receiving section receives the switching instruction through a radio communication from outside the optical disc.
A4 An optical disc according to A1, further including a power supply section for supplying power to the switching section.
A5 An optical disc according to A4, wherein the power supply section receives power through a radio communication with outside the optical disc.
A6 An optical disc according to A1, further including a substrate on which the plurality of recording layers are provided, wherein a hole is formed on the substrate, and the receiving section and the switching section are embedded into the hole.
A7 An optical disc according to A1, further including a substrate on which the plurality of recording layers are provided and an integrated circuit section including the receiving section and the switching section, wherein a hole is formed on the substrate, and the integrated circuit section is embedded into the hole.
A8 An optical disc according to A1, wherein at least a portion of the plurality of the recording layers is switched between an active state and a non-active state in response to whether an activation signal output from the switching section is applied thereto or not, the optical disc further includes a predetermined region with an active state when no activation signal is applied, and property information indicating properties of the optical disc is recorded on the predetermined region.
A9 An optical disc according to A8, wherein the predetermined recording region is in an active state regardless of presence of the activation signal.
A10 An optical disc including: a plurality of recording layers, wherein at least a portion of the plurality of the recording layers is switched between an active state and a non-active state in response to whether an activation signal is applied thereto or not, the optical disc further includes a predetermined recording region with an active state when no activation signal is applied.
A11 An optical disc according to A10, including a first region on which the plurality of the recording layers are provided and a second region on which one recording layer is provided, wherein the second region includes the predetermined recording region.
A12 An optical disc according to A10, wherein property information indicating properties of the optical disc is recorded on the predetermined recording region.
A13 An optical disc according to A10, wherein the predetermined recording region is in an active state regardless of presence of the activation signal.
A14 An optical disc according to A10, wherein the predetermined recording region is in a non-active state when the activation signal is applied thereto.
A15 An apparatus for recording information on an optical disc or reproducing information from the optical disc, the optical disc including: a predetermined layer, a first and a second layer on which tracks being respectively provided, the apparatus including a first tracking control section for controlling tracking of a first laser light to be irradiated onto the first layer; and a second tracking control section for controlling tracking a second laser light to be irradiated onto the second layer, wherein a third laser light to be irradiated onto the predetermined layer has a predetermined positional relationship with the first laser light and the second laser light, the first tracking control section and the second tracking control section respectively controls tracking of the first laser light and the second laser light as so to control tracking of the third laser light.
A16 An apparatus for recording information on an optical disc or reproducing information from the optical disc, the optical disc including a predetermined layer, a first layer on which a track being provided, the apparatus including: a tracking control section for controlling tracking of a first laser light to be irradiated onto the first layer; a first focusing control section for controlling focusing of a second laser light to be irradiated onto the first layer; and a second focusing control section for controlling focusing of a third laser light to be irradiated onto the predetermined layer, wherein the third laser light has a predetermined positional relationship with the first laser light and the second laser light, the tracking control section and the first focusing section respectively controls tracking of the first laser light and focusing of the second laser light so as to control tracking of the third laser light.
INDUSTRIAL APPLICABILITYAccording to the present invention, it becomes possible to manage IDs of discs by attaching a radio wave transmission/reception IC, including ID information, to the discs.
According to a manufacturing method of the present invention, it becomes easy to fabricate an optical disc having a radio wave transmission/reception IC, including ID information, attached thereto.
The present invention solves difficulty of searching data recorded on an exchangeable type of medium, such as an optical disc. Thus, a method of manufacturing an optical disc with an easy operation of searching data recorded on the optical disc is provided.
According to the present invention, an optical disc includes a receiving section for receiving a switching instruction for switching a target layer and a switching section for switching a target layer based on the received switching instruction. Thereby, the optical disc can switch without applying a voltage to a conducting layer of the optical disc directly from a recording/reproduction apparatus.
The present invention achieves control of tracking of a laser light to be irradiated on a target layer by controlling tracking of another laser light. Thereby, even in the case that no track is provided on the target layer, tracking of a laser light irradiated on the target layer can be controlled.
Claims
1. An optical disc comprising:
- a plurality of recording layers;
- a receiving section for receiving, from outside the optical disc, a switching instruction for switching a target layer to be targeted for recording/reproducing information among the plurality of the recording layers; and
- a switching section for switching the target layer among the plurality of recording layers, based on the received switching instruction, wherein the switching section includes a signal generation section generating three switching signals for switching the target layer.
2. An optical disc according to claim 1, further comprising a plurality of conducting layers,
- wherein each of the plurality of conducting layers is provided adjacent to at least one corresponding recording layer of the plurality of recording layers, and
- the switching section adjusts voltages being applied to each of the plurality of conducting layers so as to switch the target layer.
3. An optical disc according to claim 1, wherein the receiving section receives the switching instruction through a radio communication from outside the optical disc.
4. An optical disc according to claim 1, further comprising a power supply section for supplying power to the switching section.
5. An optical disc according to claim 4, wherein the power supply section receives power through a radio communication with outside the optical disc.
6. An optical disc according to claim 1, further comprising a substrate on which the plurality of recording layers are provided,
- wherein a hole is formed on the substrate, and
- the receiving section and the switching section are embedded into the hole.
7. An optical disc according to claim 1, further comprising a substrate on which the plurality of recording layers are provided and an integrated circuit section including the receiving section and the switching section,
- wherein a hole is formed on the substrate, and
- the integrated circuit section is embedded into the hole.
8. An optical disc according to claim 1, wherein at least a portion of the plurality of the recording layers is switched between an active state and a non-active state in response to whether an activation signal output from the switching section is applied thereto or not,
- the optical disc further includes a predetermined region with an active state when no activation signal is applied, and
- property information indicating properties of the optical disc is recorded on the predetermined region.
9. An optical disc according to claim 8, wherein the predetermined recording region is in an active state regardless of presence of the activation signal.
10. An optical disc including:
- a plurality of recording layers,
- wherein at least a portion of the plurality of the recording layers is switched between an active state and a non-active state in response to whether an activation signal is applied thereto or not, wherein the activation signal is generated from the optical disc,
- the optical disc further includes a predetermined recording region with an active state when no activation signal is applied.
11. An optical disc according to claim 10, including a first region on which the plurality of the recording layers are provided and a second region on which one recording layer is provided,
- wherein the second region includes the predetermined recording region.
12. An optical disc according to claim 10, wherein property information indicating properties of the optical disc is recorded on the predetermined recording region.
13. An optical disc according to claim 10, wherein the predetermined recording region is in an active state regardless of presence of the activation signal.
14. An optical disc according to claim 10, wherein the predetermined recording region is in a non-active state when the activation signal is applied thereto.
15. A mobile communication device for conducting wireless communication with an external relay device connected to an external server through the Internet and for conducting near field communication with an external terminal in a modulation method which is different from a modulation method for the wireless communication, comprising:
- an information processing section;
- a first communication section for conducting near field communication with an external terminal, which is external to the mobile communication device, upon receipt of an instruction from the information processing section, to receive, from the external terminal, terminal information including identification information of the external terminal stored in a storage section of the external terminal, wherein the identification information identifies the external terminal;
- a second communication section for transmitting the identification information received by the first communication section to the server through the relay device and the Internet, and for receiving related information including coded motion pictures having a plurality resolutions, which is related to identification information, that is stored in a storage section of the server, through the Internet and the relay device from the server;
- a motion picture decoder for decoding the coded motion picture to generate a motion picture having a resolution lower than a predetermined resolution from the plurality of resolutions and corresponding to the identification information included in the terminal information received by the first communication section, the related information being stored in the server; and
- a display section for displaying the motion picture generated by the motion picture decoder.
16. A mobile communication device according to claim 15, wherein the near field communication by the first communication section uses a frequency band in the neighborhood of 13.5 MHz.
17. A mobile communication device according to claim 15, wherein the mobile communication device supplies electric power to the external terminal through the near field communication, and wherein, due to the electric power, the terminal information is read from the storage section of the external terminal and the terminal information is sent to the mobile communication device.
| 4701880 | October 20, 1987 | Ichihara |
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Type: Grant
Filed: May 2, 2012
Date of Patent: Sep 29, 2015
Assignee: Panasonic Intellectual Property Corporation of America (Torrance, CA)
Inventors: Mitsuaki Oshima (Kyoto), Yasumori Hino (Nara)
Primary Examiner: Nicholas Lee
Application Number: 13/462,117
International Classification: G08B 13/14 (20060101); G06K 7/00 (20060101);
