Abstract: An information storage medium includes a substrate forming a first groove having a depth, and a second groove adjacent to the first groove and different depth from the first groove; and a recording layer formed on the substrate to record information marks, making optical characteristics of the information marks different for each such that diffracted lights from the plurality of marks orthogonally intersect one another.

Abstract: An optical disc has spatial features (notches, bumps, etc.) that intentionally distort the analog Read Data signal. For a mark or space that is centered on a spatial feature, the distortion does not affect the resulting binary Read Data signal. If an edge of a mark or space is near the spatial feature, the resulting binary Read Data signal is altered. For calibration, marks or spaces are written adjacent to spatial features, with a range of times for initiating the writes. The result is a range of write times that do not alter the binary Read Data signal. From these known times and spatial locations, it is known when a mark or space must be written to ensure accurate spatial placement.

Abstract: An optical disk consists of a first laminated layer structure and a second laminated layer structure. The first structure has a first transparent substrate having a first surface and a second surface on both sides thereof, provided on the first surface being a light-incident plane via which a light beam is to be incident in recording or reproduction, formed alternately on the second surface being a plurality of first lands and first grooves, and a first organic-dye recording layer formed on the second surface to cover the first lands and grooves. The second structure has a second substrate, alternately formed on which are a plurality of second lands and second grooves, a reflective film formed on the second transparent substrate to cover the second lands and grooves, and a second organic-dye recording layer formed on the reflective film to face the second transparent substrate.

Abstract: An information recording medium includes a lead-in area and a data area for storing contents information. The lead-in area includes a first lead-in information area and a second lead-in information area. The first lead-in information area corresponds to a first playback mode. The second lead-in information area corresponds to a second playback mode different from the first playback mode. The first lead-in information area has a first depth and is designed for storing lead-in information related to the contents information stored in the data area. The second lead-in information area includes pre-pits having a second depth greater than the first depth. The pre-pits represent predetermined information, such as information of copyright protection, related to the contents information stored in the data area.

Abstract: An information recording medium is at least composed of a substrate having a microscopic pattern constituted by a continuous substrate of grooves formed with a groove portion and a land portion alternately, a recording layer formed on the microscopic pattern for recording information, and a light transmitting layer formed on the recording layer. The microscopic pattern is formed with satisfying a relation of P??/NA, wherein P is a pitch of the land portion or the groove portion, ? is a wavelength of reproducing light for reproducing the recording layer, and NA is a numerical aperture of an objective lens. The land portion is formed with wobbling so as to be parallel with each other for both sidewalls of the land portion. An auxiliary information based on data used supplementally when recording the information and a reference clock based on a clock used for controlling a recording speed when recording the information is recorded alternately.

Abstract: In an optical disk medium, land recording tracks (1) are coupled by first and second coupling portions (3 and 4) at a particular radial position to form a tilt detecting mark SM.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: An optical disk device has a light source which emits light; and light converging means of, in each of signal mark forming regions, each of lands, or each of grooves of an optical disk, converging the light from the light source onto a signal surface of the optical disk with selectively positioning a signal mark at any one of plural positions which are arranged in a direction that is substantially perpendicular to tracks, each of the signal mark forming regions surrounded by adjacent two of boarder lines which are between two the tracks on the signal surface of the optical disk, and which are substantially parallel to the tracks, and each of which substantially divides an area between adjacent tracks in two parts.

Abstract: A hard disk A has is constructed to include: a disk 10 in which copy protection information is written in advance in a surface shape such as slits or corrugations in a pre-recording region 13 over a substrate 11 other than a data storage region 12; a pickup unit 20 for reading the copy protection information on the disk 10; and a copy protect unit 42 made operative, when it copies the encrypted data over the data storage region 12 of the disk 10 in response to the demand of the external device B: to perform an authentication with reference to the copy protection information read by the pickup unit 20; and to output the information on the secret key, as contained in the copy protection information, to the external device B which has been recognized to be correct by that authentication.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: An optical disc in which a physical address of each smallest recording unit and a recorded address increase or decrease on first and second recording layers, and a method of identifying the recording layers. Embodiments are provided for discs having first and second recording layers with a same or an opposite track spiral direction. Physical addresses of the smallest recording units and a recorded address are increased or decreased between an inner radius and an outer radius of a recording layer in a manner which enables a reproducing and/or a recording device to more rapidly reproduce and/or record data on the disc. A physical address of the smallest recording units on the first recording layer is made different from a physical address of the smallest recording units on the second recording layer.

Abstract: A Blu-ray Disc™ optical disk for video and/or audio applications comprises a data layer having in-pits recessed into a surface of at least one data layer and on-pits elevated above the surface of at least one data layer, and further having a substrate layer disposed on each data layer. The in-pits and the on-pits may be disposed in the same data layer or on different data layers. The in-pits and the on-pits are indistinguishable from each other when read using an optical drive, and the in-pits and the on-pits are observable by SEM cross-section of the data layer of the Blu-ray Disc™ optical disk. A method for anti-piracy tagging a Blu-ray Disc™ optical disk by patterning a data layer to have in-pits and on-pits is also provided, wherein the in-pits and the on-pits are indistinguishable from each other when read using an optical drive, and are observable by SEM.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: The present invention is intended to provide an information recording medium in which ID regions (identification regions) have a high recording density. The information recording medium according to the present invention has identification regions where identification information is recorded by means of protrusions and recesses provided on edges of the information storage stripe along the width of the information storage stripe.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A disclosed optical information recording medium includes a guide track layer having grooves and ridges; and recording layers composed of an optical recording material and disposed above and below the guide track layer. The guide track layer is used to determine track positions on the recording layers.

Abstract: The present invention provides an information reproducing method which does not need to insert a special pit row for detecting a phase error but can extract phase error information for producing a reproduction clock from a reproduced signal. This method specifically includes: arranging a cell of a decreased multivalued degree having information recorded by one M-value (M<N) in one part of recorded information, e.g., at each cell having information recorded by an N-value (N?3); sampling a reproduced signal when the center of a light spot comes to the center of the cell recorded by the M-value, and detecting the cell center value; and obtaining a phase error for producing a reproduction clock based on a previously derived ideal value of the cell center value, a previously derived gradient of the reproduced signal in the vicinity of the ideal value of the cell center value, and the detected cell center value.

Abstract: According to one embodiment, an information recording medium has two or more recording layers, the track pitch falls within the range from 250 to 500 nm, and the half maximum full-width of the groove of the substrate falls within the range from 47.5% to 72.5%.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: According to one embodiment, in an information recording medium in which letting H1 (nm) a groove depth of a first substrate on which a first recording layer is formed, H2 (nm) a groove depth of a second substrate on which a second recording layer is formed, H11 (nm) a thickness of a first dye layer at a land area, H12 (nm) a thickness of the first dye layer at a groove bottom area, H21 (nm) a thickness of a second dye layer at a land area, and H22 (nm) a thickness of the second dye layer at a groove bottom area, the groove depth H1 of the first substrate and the groove depth H2 of the second substrate satisfy |H11?H12|=?, |H21?H22|=?, ?/8n?H1????/3n, and ?/8n?H2????/3n.

Abstract: According to one embodiment, an information recording medium has two or more recording layers, the track pitch falls within the range from 250 to 500 nm, and the half maximum full-width of the groove of the substrate falls within the range from 47.5% to 72.5%.

Abstract: According to one embodiment, a first recording film, interlayer, and second recording film are formed on a transparent resin substrate having a groove and land. A recording mark is formed by irradiation with a short-wavelength laser beam. The light reflectance of the recording mark formed by irradiation with the short-wavelength laser beam is higher than a light reflectance before irradiation with the short-wavelength laser beam. The first recording film has a first read-only recording mark recorded by a three-dimensional pit. The second recording film has a second read-only recording mark recorded by a three-dimensional pit. The reflectances of the pits of the first and second recording layers are 4.2% to 8.4%, or the pit width of the second recording film is larger than that of the first recording layer.

Abstract: According to one embodiment, in a multilayered write once information recording medium, the light reflectance of a recording mark formed in a first recording film by irradiation with a short-wavelength laser beam is higher than a light reflectance before irradiation with the short-wavelength laser beam, the light reflectance of a recording mark formed in a second recording film by irradiation with the short-wavelength laser beam is higher or lower than a light reflectance before irradiation with the short-wavelength laser beam, and the light reflectance of a recording mark formed in a third recording film, which is arbitrarily formed, by irradiation with the short-wavelength laser beam is higher or lower than a light reflectance before irradiation with the short-wavelength laser beam.

Abstract: A method is disclosed to purify a polymeric material by filtering a melt comprising poly(arylene ether) and poly(alkenyl aromatic) through a melt filtration system. The method provides a filtered polymeric composition having reduced levels of particulate impurities. The filtered polymeric composition prepared is suitable for use in data storage media applications.

Abstract: A multilayer optical disk including a plurality of information storage layers to/from which information is recorded and/or reproduced by an optical head. The plurality of information storage layers are stacked through intermediate layers and each information storage layer includes a wobbling track groove. The shape factors (amplitude of wobbling, depth of the track groove and/or slope angle of the side wall of the track groove, etc.) of the track groove of at least one information storage layer of the plurality of information storage layers are different from the shape factors of track grooves of other information storage layers. This allows a satisfactory signal to be reproduced from each information storage layer.

Abstract: In a recording material, physical characteristic information of the recording medium, and more specifically, material information representing the material of the disc, is recorded. Accordingly, a recording apparatus and a reading apparatus easily and accurately determine the physical characteristics of the disc, thereby making it possible to provide suitable setting for performing an operation.

Abstract: In an information recording medium comprising at least a substrate, a recording layer, and a resin layer, the substrate is formed with at least a pit corresponding to a read only area 31 and a groove corresponding to a recording/reproducing area 32 without overlapping with each other. A reflectivity of the recording layer is specified to be more than 10%. The recording layer and the resin layer are continuously adhered over both the read only and recording/reproducing areas 31 and 32. The information recording medium is characterized in that both push-pull signal outputs T1 and T2, which are reproduced from the read only area 31 and the recording/reproducing area 32 respectively, are more than 0.1 and satisfy an inequality 1.5?T1/T2?0.5.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: The magneto-optical recording medium is comprised of a phase pit substrate/dielectric layer/recording layers/dielectric layer/reflection layer and a ROM and RAM can be simultaneously regenerated. The shape of the phase pit is constructed to be 5<100×Ip/Im<22 where Im is a reflection level on the mirror face and Ip is a phase pit signal output of the shortest mark when a regeneration light having polarization in a direction horizontal to the track direction of the medium is irradiated. Since the jitter of both the magneto-optical recording/regeneration signals and phase pit signals can be suppressed within an optimum range, the quality of the regeneration signals when ROM and RAM are simultaneously regenerated can be improved.

Abstract: The optical recording medium is provided with a substrate having optical transparency and disc shape; and a recording layer formed on the substrate in which incident light enters from the substrate side to record/read information. The substrate includes a distribution of the amount of birefringence in a recording area of the substrate to cancel out the birefringence derived from a stress generated by rotating the substrate; a push-pull signal obtained by an optical spot at a wavelength of 405 nm being 0.2 or more, when the substrate rotates at a constant linear velocity and the number of revolutions 6,000 rpm; and a ratio of the maximum value to the minimum value (maximum value/minimum value) in the push-pull signal being 2.0 or less.

Abstract: The depth of pits is determined by a trade-off between the level of a push-pull signal used for servo application by a push-pull method and the level of an RF signal as a reproduced signal of information. The depth d is set to be the optimum for a disk system, which has a refractive index n of a medium, an optical wavelength ?, and an optical system with a NA (Numerical Aperture) of 0.75. The most suitable depth d for both the push-pull signal level and the RF signal level falls within a range of ?/5.5n?d??/4.7n, the second most suitable depth d falls with a range of ?/5.5n?d??/4.5n, and the depth d as the widest standard falls within a range of ?/8n?d??/4.5n.

Abstract: A high-definition optical disk device for recording and reproducing data with respect to lands and grooves of an optical disk. The grooves and the lands of the optical disk are wobbled, and address information is embedded in gray code. In the grooves and the lands, both groove track address systems and land track address systems are embedded and form redundant systems. When detecting the address of a land, in addition to demodulation of the address data from the land track address system, the address data is also extracted from the groove track address system. The address data thus extracted is used for verification to detect an error in the demodulated address data.

Abstract: To make a magneto-optical disk to have higher track density and enable stable tracking servo to be performed thereon. On an magneto-optical disk, a first groove Gv1, a second groove Gv2, and a third groove Gv3 are formed so as to be adjacently arranged. The first groove Gv1 and the second groove Gv2 are deep grooves, and the third groove Gv3 is a shallow groove. Data is recorded on six recording tracks of these three grooves and three lands between respective grooves. A CTS signal is obtained by a sum signal (A+B+C+D) of a photo-detector 6, and a push-pull signal is obtained by a difference signal (A+D)?(B+C) of a photo-detector 8.

Abstract: Of file management information for managing a file, information indicating at least a recording location of the file is recorded in a data area and a spare area, and the file is reproduced based on the information of the two areas. Even when a new defect is caused, because a File Entry, that is, a location and a size of image data is held in two locations, image reproduction is enabled even if the File Entry held in one location is lost. In addition, back up of the File Entry, which is held in one location due to the defect, can further be performed, whereby new defects caused afterward can be dealt with.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A data storage device and method of making the storage device wherein a digital and analog image may be stored thereon. The storage device includes a photosensitive layer capable of retaining an optical image thereon, which may be written in a digital format that can also be read digitally.

Abstract: In a recording material, physical characteristic information of the recording medium, and more specifically, material information representing the material of the disc, is recorded. Accordingly, a recording apparatus and a reading apparatus easily and accurately determine the physical characteristics of the disc, thereby making it possible to provide suitable setting for performing an operation.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: A signal can be detected based on a level slice system and detection delay time can be reduced by setting the recording density of a header field in a linear direction lower (coarse) than that of a user data recording field. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field. A readout error of a sector number due to a detection error is compensated for by recording address marks AM for attaining byte synchronization of the header field in both of a head portion and tail portion of information recorded in the header field.

Abstract: In a read-in area on the ROM disc, there are two control-data areas, and the Disc Information recorded in each control-data area comprises a error correction code (ECC (Error Correcting Code) block that has the same contents times, and the control-data area where reproduction-control data is recorded is separated from the other control-data area by a distance greater than the width than the width in the radial direction of the largest black dot.

Abstract: There is provided an optical disk which adopts a PRML (Partial Response and Maximum Likelihood) method for reproduction of recorded information and whose shortest pit has a conical shape without a bottom surface. If the PRML method is adopted, since it is not necessary to assure a large amplitude of a reproduction waveform of the shortest pit, the pit may have a conical shape. The conical pit enables recording with the dense shortest pit even in a conventional original disk recorder and original disk exposure process, thereby increasing a recording density in a dividing direction.