# US 5,345,435 A · Optical disc and method for recording on optical disc

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- Number: US 5,345,435 A
- Document ID: US5345435A
- Status: Granted
- Kind: A
- Application number: 07/935,815
- Filed: 1992-08-26
- Granted: 1994-09-06
- Earliest claimed: 1991-08-30
- Assignees: Sony Corporation
- Inventors: Yoshimori Yamasaki
- Web page: https://patentgrep.com/patent/US5345435A

## CPC

- G11B 11/10504: {Recording (for shaping of magnetic domains G11B11/10528, for compensation of shift G11B11/1053)}
- G11B 7/005: Reproducing (G11B7/0065 takes precedence)
- 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 7/24079: Width or depth (G11B7/24076 takes precedence)
- G11B 11/1053: {to compensate for the magnetic domain drift or time shift}
- G11B 11/10597: {Adaptations for transducing various formats on the same or different carriers}
- G11B 20/1258: {where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs}
- 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)

## Abstract

An optical disc having a plurality of recording zones, each having 2.sup.n tracks, with the recording capacity of each track in a given zone being equal and the recording capacity being different for each recording zone, and with a line recording density of each recording zone being approximately equal.

## Claims

### Claim 1

An optical disc having formed thereon plural tracks for recording information data and comprising:
a recording region subdivided into plural recording zones each having 2.sup.n tracks, n being an integer natural number, with each track in a given recording zone having a same recording capacity which is different from a recording capacity of tracks in different recording zones, and wherein a line recording density within the recording zones is approximately equal.

### Claim 2 (depends on 1)

A recording method according to claim 1, wherein the information data are recorded in accordance with a magnetic field modulating system which is a system consisting in changing a waveform rise and fall timings depending on an intensity of a recording magnetism.

### Claim 3 (depends on 1)

A recording method according to claim 1, wherein the information data are recorded in accordance with a mark length recording system which is a system consisting in inverting a level of a recording waveform.

### Claim 4 (depends on 1)

A recording method according to claim 1, wherein the information data are recorded in accordance with an edge recording system which is a system consisting in recording based on a rising and a falling edge of a readout waveform of recording data during readout.

### Claim 5

An optical disc having recording tracks formed thereon, in which information data are recorded, at a pitch narrower than 1.6 .mu.m, wherein the improvement comprises:
that a reciprocal of a line recording density of circumferential recording tracks is 1.0 to 0.6 .mu.m/bit, and wherein
that a recording region on which information data are recorded according to an edge recording system is subdivided into 2 to 10 recording zones at intervals of plural tracks.

### Claim 6

A method for recording on an optical disc, comprising the steps of:
forming a plurality of tracks on the optical disc, the tracks having a pitch narrower than 1.6 .mu.m,
forming each track to have a reciprocal of a line recording density in a circumferential direction to be 1.0 to 0.6 .mu.m/bit, and
subdividing a recording region of the optical disc into 2 to 10 recording zones at intervals of plural tracks and
carrying out recording according to an edge recording system.

### Claim 7

A method for recording information data in a recording region of an optical disc comprising the steps of:
subdividing the recording region of the optical disc into plural recording zones each having 2.sup.n tracks, n being an integer natural number, and
recording the information data so that each track in a given recording zone has a same recording capacity, which is different from a recording capacity of tracks in the other recording zones of the plurality of recording zones, and a line recording density within the recording zones is substantially equal.

### Claim 8

An optical disc having recording tracks formed thereon on which information data are recorded, wherein the improvement comprises:
that the tracks are formed at a pitch narrower than 1.6 .mu.m, a reciprocal of a line recording density of circumferential recording tracks is 1.0 to 0.7 .mu.m/bit, and
wherein a recording region on which the information data are recorded is subdivided into 2 to 10 recording zones at intervals of plural tracks.

### Claim 9

A method for recording information data in a recording region of an optical disc on which plural recording tracks are formed, comprising the steps of:
forming the recording tracks so that the recording tracks have a pitch narrower than 1.6 .mu.m,
forming circumferential recording tracks to have a reciprocal of a line recording density of 1.0 to 0.7 .mu.m/bit, and
subdividing each recording zone into plural tracks, the number of the recording zones being 2 to 10.