# US 7,411,892 B2 · Information recording medium

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- Number: US 7,411,892 B2
- Document ID: US7411892B2
- Status: Granted
- Kind: B2
- Application number: 11/875,877
- Filed: 2007-10-20
- Published: 2008-02-21
- Granted: 2008-08-12
- Earliest claimed: 2000-04-10
- Assignees: Victor Company of Japan, Ltd.
- Inventors: Tetsuya Kondo
- Web page: https://patentgrep.com/patent/US7411892B2

## CPC

- G11B 7/24082: Meandering
- G11B 7/007: Arrangement of the information on the record carrier, e.g. form of tracks {, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track}
- G11B 7/0079: {Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas}
- G11B 7/0901: {for track following only (G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence)}
- G11B 7/0938: {servo format, e.g. guide tracks, pilot signals}
- G11B 7/24091: Combinations of pits and tracks with specific interrelation
- G11B 23/40: Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
- G11B 7/0033: with cards {or other card-like flat carriers, e.g. flat sheets of optical film}
- G11B 7/00455: {involving reflectivity, absorption or colour changes}
- G11B 7/24012: Optical cards
- G11B 7/2585: based on aluminium
- G11B 20/00304: {the key being stored in the lead-in area [LIA]}
- G11B 20/00405: {the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track}
- G11B 20/00601: {wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity}
- G11B 2007/24308: {transition metal elements of group 11 (Cu, Ag, Au)}
- G11B 2007/2431: {group 13 elements (B, Al, Ga, In)}
- G11B 2007/24314: {group 15 elements (e.g. Sb, Bi)}
- G11B 2007/24316: {group 16 elements (i.e. chalcogenides, Se, Te)}
- G11B 2220/211: Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media
- Y10T 428/21: Circular sheet or circular blank
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

An information recording medium comprising at least a substrate and a recording layer,
wherein said substrate is formed with a read only area and a recording/reproducing area, and wherein said read only area and said recording/reproducing area do not overlap with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer is formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T1 reproduced from said read only area is more than 0.1 and another push-pull signal output T2 reproduced from said recording/reproducing area is more than 0.1, and wherein 1.5≧T1/T2≧0.5, and
wherein said recording/reproducing area is composed of a groove and a land, and further
wherein that track pitch of said grooves is arranged so as to be 0.74 μm.

### Claim 2

A reproducing method for reproducing an information recording medium comprising at least a substrate and a recording layer,
wherein said substrate is formed with a read only area and a recording/reproducing area, and wherein said read only area and said recording/reproducing area do not overlap with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer is formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T1 reproduced from said read only area is more than 0.1 and another push-pull signal output T2 reproduced from said recording/reproducing area is more than 0.1, and wherein 1.5≧T1/T2≧0.5, and
wherein said recording/reproducing area is composed of a groove and a land, and
wherein track pitch of said groove is arranged so as to be 0.74 μm, and further
wherein said information recording medium is reproduced by irradiating a laser beam on said recording layer.

### Claim 3

A reproducing method for reproducing an information recording medium comprising at least a substrate and a recording layer,
wherein said substrate is formed with a read only area and a recording/reproducing area, and wherein said read only area and said recording/reproducing area do not overlap with each other, and
wherein a reflectivity of said recording layer is more than 10%, and
wherein said recording layer is formed continuously over at least two areas of said read only area and said recording/reproducing area, and
wherein a push-pull signal output T1 reproduced from said read only area is more than 0.1 and another push-pull signal output T2 reproduced from said recording/reproducing area is more than 0.1, and
wherein said recording layer is composed of a recording material that is recordable by a wavelength of 405 nm, and further
wherein the information recording medium is reproduced by irradiating a laser beam on said recording layer through a lens having a numerical aperture NA of any one selected out from 0.4 to 0.9.