Responsive To Change In Transduced Location Patents (Class 369/47.4)
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Patent number: 7200083Abstract: A speed control method used in an optical disk drive for recording data onto an optical disk includes the following steps: detecting an allowable maximum recording speed of the optical disk and an allowable minimum recording speed of the optical disk, calculating a rotation speed of the optical disk according to the allowable maximum recording speed of the optical disk at an outermost region of the optical disk, calculating a critical position of the optical disk according to the allowable minimum recording speed at the rotation speed, and recording data onto the optical disk at the allowable minimum recording speed between an initial data position of the optical disk and the critical position of the optical disk.Type: GrantFiled: June 23, 2004Date of Patent: April 3, 2007Assignee: Lite-On It CorporationInventor: Ling-Feng Chen
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Patent number: 7171156Abstract: A method and an apparatus for providing digital quality transmission of audio and non-audio information using low cost components and arrangement. The present invention provides for the transmission of the audio and non-audio transmission by first converting the data to conform to the CD standard format and conditioning the converted signal to thereby generate a conditioned EFM signal. The conditioned EFM signal is used to frequency modulate a carrier. By converting the audio and non-audio information to conform to the CD standard format, the present method provides a low cost means of transmitting the data with error detection and correction. Another aspect of the present invention relates to embedding the non-audio information in the SUBCODE block of the data frame according to the CD standard. The non-audio information may be unrelated to the audio information, and the audio and non-audio information may be transmitted to separate devices.Type: GrantFiled: August 13, 2002Date of Patent: January 30, 2007Assignee: Thomson LicensingInventors: John Justin Caffrey, Norbert Joseph Rehm, III, Sin Hui Cheah, Karl Lewis Friedline
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Patent number: 7116622Abstract: A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sent to the motor, which causes the motor to produce a first armature current and a second armature current. In another mode, a DC signal of a third voltage is produced, which causes the motor to produce a third armature current. The armature currents are detected, and test voltages are outputted. The first and second voltages, and the first and second test voltages are used to find a motor coefficient. The third voltage, the motor coefficient, and the third test voltage are used to calculate a motor rotation speed. The calculated speed is used to control the real motor speed.Type: GrantFiled: June 18, 2003Date of Patent: October 3, 2006Assignee: MediaTek Inc.Inventor: Po-Jen Shen
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Patent number: 7088670Abstract: Plural grooves or lands formed in an information recording carrier include at least a wobbling region and data is recorded wobblingly in this wobbling region by frequency shift modulation while recorded digitally with a single or multiple waves as a channel bit.Type: GrantFiled: September 18, 2002Date of Patent: August 8, 2006Assignee: Victor Company of Japan LimitedInventor: Tetsuya Kondo
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Patent number: 7065018Abstract: A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a physical sector address (PSA) from an optical medium, calculate a table index based on the PSA, enter a lookup table module to acquire reference data, and maintain a constant data rate transfer from the optical medium for a range of PSAs.Type: GrantFiled: September 10, 2001Date of Patent: June 20, 2006Assignee: DPHI Acquisitions, Inc.Inventors: Charles R. Watt, Christopher J. Turner
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Patent number: 7012866Abstract: A rotation control method controls rotation of a CAV system recording medium which has a plurality of zones divided in a radial direction thereof. The rotation control method detects a state within a memory which temporarily stores write data to be written on the recording medium and/or read data read from the recording medium, and switches and controls a rotational speed of the recording medium based on the detected state of the memory, depending on an area which is accessed of a plurality of areas of the recording medium dividing the recording medium in the radial direction thereof.Type: GrantFiled: March 20, 2001Date of Patent: March 14, 2006Assignee: Fujitsu LimitedInventors: Teruji Yamakawa, Akira Ban, Yutaka Horiguchi
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Patent number: 7002885Abstract: A method for determining an optical write power and an optical disc access system using the same. In addition to a typical Inner Power Calibration Area, the method includes an Outer (second) Power Calibration Area implementation on the outer area of a Readable/Writable Optical disc with a constant linear velocity (CLV) format; when a data writing speed selected by a user causes a rotation speed required by an optical power calibration on an Inner (first) Power Calibration Area of the disc greater than an Optical Power Calibration (OPC) limit, the optical disc access system uses a lower rotation speed for the optical power calibration on the Outer Power Calibration Area to ensure the accuracy of the power calibration.Type: GrantFiled: October 1, 2002Date of Patent: February 21, 2006Assignee: Benq CorporationInventors: Wai W. Wang, Tso-Tsai Chen, Mason Yen
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Patent number: 6961860Abstract: A method and system for optimizing energy consumption during data read/write operations in a disk-based memory system is provided. The method includes the steps of reading a data clip length, Ls and determining an available energy-optimum recordable track segment.Type: GrantFiled: December 7, 2001Date of Patent: November 1, 2005Assignee: Nokia CorporationInventors: Jakke Makela, Venkatesh Vadde
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Patent number: 6901040Abstract: A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can include a first module for providing a period error, a proportional gain (Kp) and an integration gain (Ki); a second module for operating on the Ki and Kp to provide an output; and a third module for commutating the motor in response to the output.Type: GrantFiled: September 10, 2001Date of Patent: May 31, 2005Assignee: DPHI Acquisitions, Inc.Inventors: Charles R. Watt, Christopher J. Turner
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Patent number: 6876609Abstract: A system and method for controlling spin speed, which includes a module for receiving an indication to make a velocity change from a first RPM to a second RPM. The difference between the first RPM and the second RPM is a predetermined value. The module is operable to rotate an optical medium at a maximum control effort from the first RPM to the second RPM, and rotate the optical medium with a proportional plus integral (P+I) control at the second RPM.Type: GrantFiled: September 10, 2001Date of Patent: April 5, 2005Assignee: DPHI Acquisitions, Inc.Inventors: Charles R. Watt, Christopher J. Turner
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Patent number: 6829204Abstract: An optical disc recording device controls a rotational rate of an optical disc and an optical disc recording device recording using a constant angular velocity method, thereby efficiently using the performance of the optical disc. A CPU reads management information (a maximum address value) for a farthest recording region, which is located at a circumference farthest from a center of the optical disc. A distance from the center of the optical disc to the farthest circumference of the recording region is calculated based on the read maximum address value. The rotational rate is calculated based on the calculated distance so that the recorded data rate of the farthest recording region is a maximum recorded data rate for the optical disc, and therefore is set to be used by a servo controller.Type: GrantFiled: January 16, 2001Date of Patent: December 7, 2004Assignee: Samsung Electronics Co., Ltd.Inventor: Tohru Yoshida
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Patent number: 6826136Abstract: This invention provides method and apparatus for controlling reproduction speed of an optical disk, which detects the magnitude of a disk vibration after initial operation of an optical disk and adjusts the disk rotation speed based upon the vibration magnitude. The method according to this invention comprises the steps of rotating an installed optical disk; detecting the quantity of signal derived from tracking error signals which are combined from signals reproduced from the optical disk when the rotation speed reaches to a predetermined speed; and deciding whether to increase the rotation speed above the predetermined speed based upon the detected quantity of the signal. This invention is able to reproduce an optical disk at the possible maximum speed within allowable speed limit through detecting accurate disk vibration magnitude at the initial operation stage and adjusting the reproduction speed to higher speed.Type: GrantFiled: March 30, 2000Date of Patent: November 30, 2004Assignee: LG Electronics Inc.Inventor: Hong Jo Jeong
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Publication number: 20040202074Abstract: A method of automatically pausing an optical pickup in a DVD-RAM disc drive includes driving a DVD-RAM disc; determining whether a tracking error signal is generated during the driving of the DVD-RAM disc; generating a land/groove signal to discern land tracks and groove tracks of the DVD-RAM disc; determining from which track the tracking error signal has been generated in response to the determination that the tracking error signal has been generated; generating a jump signal in response to a state of the land/groove signal varying; and moving the optical pickup back by ½ of a track in response to the jump signal.Type: ApplicationFiled: December 1, 2003Publication date: October 14, 2004Applicant: SAMSUNG ELECTRONICS CO. LTD.Inventor: Jong-nam Park
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Patent number: 6762983Abstract: An optical disc drive has a spindle motor for rotating an optical disc; an optical pick-up which can move at least in a radial direction of the optical disc; a sensor for detecting the rotation of the motor; and a spindle servo for controlling the rotation number of the spindle motor based on signals from the sensor. This spindle servo is adapted to be operated at the time of changing the rotation number of the spindle motor, e.g. at the time of changing rotation speed of the spindle motor in multiple steps given by integral multiples of 1 or at the time of changing rotation speed when the optical pick-up moves in the radial direction of the optical disc. According to this optical disc drive, it takes a relatively short time until the rotation speed of the motor reaches the target rotation speed and its rotation becomes stable.Type: GrantFiled: October 14, 1998Date of Patent: July 13, 2004Assignee: Mitsumi Electric Co., LtdInventor: Junichi Andoh
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Patent number: 6751185Abstract: An optical disc is described for recording data, which disc has a recording area subdivided in coaxial annular zones comprising circular or spiral tracks. Each track within one of the zones is arranged for storing a same predetermined amount of data, and the first track of each zone stores an amount of data proportional to the radial position, resulting on average in a substantially constant density, the so called CLV (Constant Linear Velocity) density. The tracks comprise periodic characteristics, e.g. a wobble, which are radially aligned within each one of the zones, the periodicity being indicative of the track recording density for the track concerned. Hence the data recording and reading speed can be synchronised to the periodic characteristics, whereas any cross-talk of the periodic characteristics of neighbouring tracks is avoided.Type: GrantFiled: May 20, 2003Date of Patent: June 15, 2004Assignee: Koninklijke Philips Electronics N.V.Inventor: Gijsbert J. Van Den Enden
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Patent number: 6728177Abstract: An optical disc recording method to record data on a disc using multiple speeds by dividing a disc region into an inner circumference region and an outer circumference region depending on radii of the disc, setting a multiple recording speed for each region; setting optical recording power in a lead-in region of the inner circumference region and a lead-out region of the outer circumference region, by performing optimum power controls therein; determining in which one of the divided regions data is to be recorded using an address detected from the disc, rotating the disc at the multiple recording speed set for the one region in which the data is to be recorded, and recording the data in the one region using the set optical recording power for the one region.Type: GrantFiled: September 6, 2001Date of Patent: April 27, 2004Assignee: Samsung Electronics Co., Ltd.Inventors: Pyong-yong Seong, Kyu-hwan Jung
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Publication number: 20040057356Abstract: In a case where an image of a density that is uniform over a substantially whole area of an optical disc (200) is to be formed, a servo circuit (138) controls the rotation speed of a spindle motor (130) to be constant, and an ALPC circuit (162) controls the current level of a drive signal Li so that the laser power is constant. In this case, a main control section (170) sets the movement distance of an optical pickup (100) to be larger in the inner peripheral side where the line width of the image is larger, and that of the optical pickup (100) to be smaller in the outer peripheral side where the line width is smaller. The main control section (170) sends to a the motor driver (142) instructions for moving the optical pickup (100) by a movement distance which is determined on the basis of the setting.Type: ApplicationFiled: June 26, 2003Publication date: March 25, 2004Applicant: Yamaha CorporationInventor: Morito Morishima
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Publication number: 20040027941Abstract: An optical recording method and apparatus with different recording rates are provided for effectively increasing the average recording rate. The optical recording method includes the steps of: controlling a recording rate with a constant linear velocity (CLV) control mode; recording data; judging whether the recording rate has to be increased according to a rotating speed of a spindle motor or a recording position; and performing a process for changing the rotating speed if the recording rate is increased, and continuing recording data at the same recording rate if the recording rate is not increased. The step for changing the rotating speed includes the steps of: pausing recording data; registering a paused zone of a disc; determining a new rotating speed of the spindle motor, and driving the spindle motor at the new rotating speed; and linking recording zones to continue recording data at a new recording rate from the paused zone, when the rotating speed of the spindle motor is stable.Type: ApplicationFiled: August 9, 2002Publication date: February 12, 2004Inventors: Chih-Yuan Chen, Shou-Ren Tsai, Jyh-Shin Pan
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Publication number: 20030206501Abstract: A system and method for controlling the position of an optical head of a disc during high speed recording. In one embodiment of the method, an optical disc has a plurality of tracks. The method comprises implementing CLV recording by said optical drive, determining a wobble signal based on address information contained in said plurality of tracks of said optical disk and determining a wobble clock signal based on said wobble signal. The method further comprises decoding said wobble clock signal by a decoder, said decoder to provide a sync clock signal to an encoder loop circuit, said sync clock signal based on said wobble clock signal generating an encoder clock signal using said encoder loop circuit. In addition, the method comprises comparing said sync clock signal to said encoder clock signal to provide a position command to position the optical head of said optical drive.Type: ApplicationFiled: May 2, 2002Publication date: November 6, 2003Inventors: Hubert Song, Akio Tanaka
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Publication number: 20030198153Abstract: An optical disc is described for recording data, which disc has a recording area subdivided in coaxial annular zones comprising circular or spiral tracks. Each track within one of the zones is arranged for storing a same predetermined amount of data, and the first track of each zone stores an amount of data proportional to the radial position, resulting on average in a substantially constant density, the so called CLV (Constant Linear Velocity) density. The tracks comprise periodic characteristics, e.g. a wobble, which are radially aligned within each one of the zones, the periodicity being indicative of the track recording density for the track concerned. Hence the data recording and reading speed can be synchronised to the periodic characteristics, whereas any cross-talk of the periodic characteristics of neighbouring tracks is avoided.Type: ApplicationFiled: May 20, 2003Publication date: October 23, 2003Inventor: Gijsbert J. Van Den Enden
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Method for controlling rotation of an optical disk during a zone change in a data read out operation
Patent number: 6633524Abstract: A method for controlling the number of disk revolutions in a disk drive using a zone CLV control system to reduce or eliminate the possibility of read-out errors when the data read-out position is shifted from a current zone to a neighboring zone during a sequential data read-out operation. In accordance with the method, it is determined whether or not data to be read out is sequential data, when a zone change is made. Where sequential data is to be read out, the zone change is made under the condition in which the gain of a rotation control system for the disk motor is attenuated. Where the data to be read out is not sequential data, the gain of the disk motor rotation control system is increased. Under this condition, a seek operation is executed.Type: GrantFiled: May 20, 1999Date of Patent: October 14, 2003Assignee: Samsung Electronics Co., Ltd.Inventor: Tohru Yoshida -
Publication number: 20030174602Abstract: A modulated or deflected recording light for forming a signal area on a disk substrate for creating a master is generated, and the rotating disk substrate coated with a photosensitive material is irradiated with the recording light for exposure while the recording light is being moved in a radial direction of the disk substrate. During the irradiation of the recording light, the rotational speed of the disk substrate and the movement speed of the recording light are controlled in such a manner that they have a predetermined relationship in accordance with the pitch of tracks in the signal area. The recording light is modulated or deflected continuously in accordance with the signals for irradiation on the disk substrate, using signals corresponding to a plurality of signal areas with different track pitches.Type: ApplicationFiled: February 25, 2003Publication date: September 18, 2003Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Shinya Abe, Shuji Sato
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Publication number: 20030174605Abstract: The present invention is directed to optical discs (1), (4) on which enciphered data is recorded, wherein such optical discs comprise first recording areas (3b), (4b), where enciphered contents data is recorded, and second recording areas (3a), (4a) provided at the position where read-out is carried out prior to the first recording areas and including a first area portion (6) where cipher key data for decoding enciphered contents data is recorded and a second area portion (7) where identification data for identification of recording medium modulated by a modulation system different from that of at least the first area portion is recorded.Type: ApplicationFiled: February 24, 2003Publication date: September 18, 2003Inventors: Yoichiro Sako, Takashi Kihara, Shinichi Kazami
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Publication number: 20030090972Abstract: The method of controlling data writing velocity of an optical disk player is capable of correctly writing data on a nonstandard optical disk as well as a standard optical disk.Type: ApplicationFiled: October 28, 2002Publication date: May 15, 2003Inventors: Yuji Handa, Takashi Harada
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Publication number: 20030072225Abstract: There is provided an optical disk drive for playing or playing and recording an optical disk, and a method for controlling the optical disk drive, wherein, while the rpm of a spindle motor (11) is changed, the spindle motor (11) is controlled according to FG servo by a second spindle motor controller (23), and tracking servo by a tracking controller (18) is turned off.Type: ApplicationFiled: November 26, 2001Publication date: April 17, 2003Inventor: Junji Tada
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Publication number: 20030026180Abstract: An optical disk device for recording data in an optical disk under ZCLV control is provided. The optical disk device divides the optical disk into a plurality of zones, and drives said optical disk at a linear velocity fixed in each zone but varied among the zones. At least one of the linear velocity and the number of zones of the optical disk is controlled in accordance with the amount of data to be recorded. Data recording time is reduced by dynamically changing at least one of the linear velocity and the number of zones of the optical disk in accordance with the amount of data to be recorded, rather than fixing the number of zones and the linear velocity thereof.Type: ApplicationFiled: July 11, 2002Publication date: February 6, 2003Applicant: TEAC CorporationInventor: Kiyoshi Shidara
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Patent number: 6515948Abstract: It is intended to prevent occurrence of rotation lock waiting times when a simultaneous recording and reproducing operation is performed on a disc-shaped recording medium according to the ZCLV scheme. In a period when audio data of one data block are input to a recording buffer at a constant rate via an A/D converter, another data block that was input immediately before is recorded on and reproduced from an optical disc. Audio data constituting the reproduced data block are temporarily stored in a reproduction buffer and then read out at the constant rate and output via a D/A converter. A system controller performs control so that data blocks are recorded on the optical disc successively. As for a data block that is recorded in two adjacent zones, the system controller performs control so that the same data block that is read from the recording buffer, rather than the data block that has been recorded on the optical disc, is reproduced.Type: GrantFiled: August 25, 2000Date of Patent: February 4, 2003Assignee: Denon, Ltd.Inventor: Tadahiko Sakamoto
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Publication number: 20020191506Abstract: An optical disk recording method comprising steps of a) performing recording onto the optical disk with a ZCLV method by using zone parameter storage means for storing at least one zone division time and CLV of each zone in a track formed on the optical disk, as zone parameters, for each of a plurality of recording modes and optical disk type determination means for determining the type of the optical disk before recording; b) performing optimization of the recording velocity by detecting, before recording, servo signal fluctuation by accessing the optical disk, by determining maximum recording velocity defined by the speed of a rotational motor rotating the optical disk, and by calculating a changing point of the recording velocity; and c) limiting the speed of the rotational motor, when the servo signal fluctuation at the surface of the optical disk exceeds a reference level and determining the relation between the zone division time and the CLV of each zone.Type: ApplicationFiled: June 7, 2002Publication date: December 19, 2002Inventors: Akihiko Okamoto, Yoshiyuki Ishiyama
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Patent number: 6473377Abstract: An optical disc record carrier having at least one wobbled groove that permits information recording on both groove and land tracks is provided. Each groove has a sync wobbling modulated with a continuous signal and an address wobbling. The address wobbling includes an address portion including address information of each sector. The address portion comprising presence of a first predetermined number of wobbles and absence of a second predetermined number of wobbles. The presence and absence correspond to respective logical values of binary system. The grooves and lands are substantially the same in width throughout and wobble in phase.Type: GrantFiled: July 31, 2001Date of Patent: October 29, 2002Assignee: Victor Company of Japan, Ltd.Inventors: Hideharu Eguchi, Atsushi Hosoda, Ichiro Ueno, Yasuhiro Ueki
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Publication number: 20020141304Abstract: A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can include a first module for providing a period error, a proportional gain (Kp) and an integration gain (Ki); a second module for operating on the Ki and Kp to provide an output; and a third module for commutating the motor in response to the output.Type: ApplicationFiled: September 10, 2001Publication date: October 3, 2002Inventors: Charles R. Watt, Christopher J. Turner
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Publication number: 20020131349Abstract: A system and method for controlling spin speed, which includes a module for receiving an indication to make a velocity change from a first RPM to a second RPM. The difference between the first RPM and the second RPM is a predetermined value. The module is operable to rotate an optical medium at a maximum control effort from the first RPM to the second RPM, and rotate the optical medium with a proportional plus integral (P+I) control at the second RPM.Type: ApplicationFiled: September 10, 2001Publication date: September 19, 2002Inventors: Charles R. Watt, Christopher J. Turner
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Publication number: 20020131350Abstract: A writing method for an optical disc to optimize a writing speed, wherein a spiral track on the optical disc is divided into a plurality of zones, and different CLV writing speeds are used for performing a ZCLV writing to the zones respectively. The writing method comprises steps of: setting a plurality of writing modes; storing a plurality of zone parameter sets for the writing modes respectively in a memory, wherein each of the zone parameter sets comprises dividing times for dividing the zones, and the different CLV writing speeds for the zone respectively; determining a disc type of the optical disc by a disc type determining device before the ZCLV writing is performed; selecting one of the zone parameter sets that is suitable to the disc type of the optical disc; and performing the ZCLV writing with the writing mode corresponding to the selected zone parameter set.Type: ApplicationFiled: March 14, 2002Publication date: September 19, 2002Inventors: Shinichi Kurobe, Shinichi Sato, Hideki Iwasaki
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Publication number: 20020114232Abstract: An optical disc recording method to record data on a disc using multiple speeds by dividing a disc region into an inner circumference region and an outer circumference region depending on radii of the disc, setting a multiple recording speed for each region; setting optical recording power in a lead-in region of the inner circumference region and a lead-out region of the outer circumference region, by performing optimum power controls therein; determining in which one of the divided regions data is to be recorded using an address detected from the disc, rotating the disc at the multiple recording speed set for the one region in which the data is to be recorded, and recording the data in the one region using the set optical recording power for the one region.Type: ApplicationFiled: September 6, 2001Publication date: August 22, 2002Inventors: Pyong-yong Seong, Kyu-hwan Jung
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Publication number: 20020105867Abstract: An optical disk recording apparatus operates on an optical disk having circular tracks which are provisionally written with an index signal used for securing a constant linear velocity of the optical disk from an innermost circular track to an outermost circular track, and records data along the circular tracks at different linear densities on different annular zones of the optical disk. In the apparatus, a disk drive section rotates the optical disk while synchronizing the index signal successively read from the rotated optical disk with a predetermined reference clock signal to thereby maintain the constant linear velocity of the circular tracks. A clock generating section multiples or divides the reference clock signal by different rates to generate different writing clock signals in correspondence to the different annular zones of the optical disk.Type: ApplicationFiled: November 20, 2001Publication date: August 8, 2002Inventors: Takuya Tamaru, Tatsuo Fushiki, Katsuichi Osakabe, Yusuke Konagai, Akira Usui, Kentaro Nomoto, Masaki Dojun, Kazuhiko Honda
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Publication number: 20020097646Abstract: A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a physical sector address (PSA) from an optical medium, calculate a table index based on the PSA, enter a lookup table module to acquire reference data, and maintain a constant data rate transfer from the optical medium for a range of PSAs.Type: ApplicationFiled: September 10, 2001Publication date: July 25, 2002Inventors: Charles R. Watt, Christopher J. Turner
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Publication number: 20020071363Abstract: A disk reproducing device comprising: clock signal extracting means for extracting a regenerative clock signal from a reproduced signal; synchronization detecting means for detecting a synchronizing signal from the reproduced signal; extracted clock signal verification means for verifying that the regenerative clock signal is correctly extracted; signal processing means for performing variable linear velocity reproduction; target reproducing speed setting means for setting a target reproducing speed; reproducing speed verification means for verifying that a reproducing speed reaches the target reproducing speed; and signal processing start command generating means for outputting a signal processing start command referring outputs of said extracted clock signal verification means and said reproducing speed verification means.Type: ApplicationFiled: February 7, 2002Publication date: June 13, 2002Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Toshikazu Koudo, Masaharu Imura, Yoshiki Kuno, Yasuhisa Mashiko, Hidefumi Ishibashi
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Publication number: 20020064110Abstract: In an optical disk drive, an OPC is performed prior to a start of recording of an optical disk by accessing a power calibration area of the disk with a light beam emitted by a light source while the disk is rotated at a constant linear velocity. An optimum recording power for the light source during the recording is determined based on results of the OPC. A highest linear velocity of linear velocities is changed to a next highest linear velocity for a controlled velocity of a disk rotation device during a subsequent OPC. It is detected whether the OPC and the determination are normally performed after one of the linear velocities is set. The controlled velocity during the recording is set to an angular velocity corresponding to the one of the linear velocities at which the OPC and the determination are normally performed.Type: ApplicationFiled: November 28, 2001Publication date: May 30, 2002Inventor: Shinichi Sato
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Publication number: 20020044507Abstract: An optical disk device records data on a recordable or rewritable optical disk. The optical disk device comprises zone storing means for preliminarily storing locations of a plurality of zones set by dividing a recordable or rewritable area of the optical disk from an inner periphery thereof to an outer periphery thereof, position detecting means for detecting a position on the optical disk so as to record data at the position, judging means for judging which of the zones the position corresponds to by referring to the zone storing means, and controlling means for controlling the device to perform a data-recording by a CLV method to each of the zones specified by the judging means by setting a recording velocity and a recording power for each of the zones so as to enable the data-recording to provide an equal recording density to all of the zones.Type: ApplicationFiled: August 8, 2001Publication date: April 18, 2002Inventors: Kei Hagiwara, Haruyuki Suzuki
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Publication number: 20020039334Abstract: A rotation control method controls rotation of a CAV system recording medium which has a plurality of zones divided in a radial direction thereof. The rotation control method detects a state within a memory which temporarily stores write data to be written on the recording medium and/or read data read from the recording medium, and switches and controls a rotational speed of the recording medium based on the detected state of the memory, depending on an area which is accessed of a plurality of areas of the recording medium dividing the recording medium in the radial direction thereof.Type: ApplicationFiled: March 20, 2001Publication date: April 4, 2002Applicant: FUJITSU LIMITEDInventors: Teruji Yamakawa, Akira Ban, Yutaka Horiguchi
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Publication number: 20020036959Abstract: An optical storage carrier drive has a rotative mechanism for rotating an optical storage carrier, and a data access device for recording data to a track on the optical storage carrier. The track contains data units. The speed of each data unit passing by the data access device is termed the linear velocity. The method involves building a look-up table that divides the data units on the track into at least two sequentially arranged data blocks, and giving each data unit a different linear velocity to reduce the acceleration and deceleration of the angular velocity of the optical storage carrier.Type: ApplicationFiled: September 21, 2001Publication date: March 28, 2002Inventors: Meng-Shin Yen, William Wai Wang, Tso-Tsai Chen, Chi-Hung Chen
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Publication number: 20020024903Abstract: An optical disk unit presets a value &thgr;1 which prescribes an optimum recording pulse width of a light source for a case where the optical disk is rotated at a predetermined linear velocity on a track located at a predetermined radial position on the optical disk, and an optimum power ratio &Dgr;P of an extra pulse at a leading portion of the recording pulse where power is increased. Information is recorded on the optical disk while controlling a light emission waveform of the light source based on a value &thgr;1 (v) which prescribes the recording pulse width, a power ratio &Dgr;P(v) and an optimum recording power Pwo(v) which are successively calculated.Type: ApplicationFiled: May 24, 2001Publication date: February 28, 2002Applicant: Ricoh Company, Ltd.Inventor: Shinichi Sato
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Publication number: 20010050887Abstract: An optical disc recording device controls a rotational rate of an optical disc and an optical disc recording device recording using a constant angular velocity method, thereby efficiently using the performance of the optical disc. A CPU reads management information (a maximum address value) for a farthest recording region, which is located at a circumference farthest from a center of the optical disc. A distance from the center of the optical disc to the farthest circumference of the recording region is calculated based on the read maximum address value. The rotational rate is calculated based on the calculated distance so that the recorded data rate of the farthest recording region is a maximum recorded data rate for the optical disc, and therefore is set to be used by a servo controller.Type: ApplicationFiled: January 16, 2001Publication date: December 13, 2001Inventor: Tohru Yoshida
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Patent number: RE38704Abstract: An optical disk apparatus comprising a reproduced signal detector which digitizes a reproduced signal from an optical disk, a broadband synchronizing clock signal generator for generating a synchronizing clock signal for use in reproducing data, a signal processor for processing signals, and a disk rotation controller for controlling the optical disk by switching control modes according to the reproducing position of the disk, that is, performing CAV control using the constant rotating velocity which is the same as the current rotating velocity in a range where the synchronizing clock signal generator allows a reproduced signal to be subjected to pull-in-synchronization, and performing CLV control so that the linear velocity is constant to minimize the pull-in-enable changes of number of revolutions in a range exceeding the pull-in-synchronization range, by which arrangement the amount of change of number of spindle motor revolutions when the reproducing position of the optical pickup changes is minimized, thType: GrantFiled: November 15, 2001Date of Patent: February 15, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Taizou Kusano, Yoshiro Kashiwabara, Yasuhiro Wada, Keisuke Umeda