# US 6,577,590 B2 · Optical disk having wobble patterns

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- Number: US 6,577,590 B2
- Document ID: US6577590B2
- Status: Granted
- Kind: B2
- Application number: 10/108,917
- Filed: 2002-03-28
- Published: 2003-03-06
- Granted: 2003-06-10
- Earliest claimed: 2000-09-01
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Junichi Minamino; Atsushi Nakamura; Shigeru Furumiya; Hiromichi Ishibashi; Takashi Ishida; Toyoji Gushima
- Web page: https://patentgrep.com/patent/US6577590B2

## CPC

- G11B 27/3027: {used signal is digitally coded}
- 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 7/00745: {Sectoring or header formats within a track (formats in general G11B20/12)}
- G11B 7/24082: Meandering
- 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 20/00492: {wherein content or user data is encrypted}
- G11B 20/10009: {Improvement or modification of read or write signals}
- G11B 20/1217: {on discs}
- G11B 20/1833: {by adding special lists or symbols to the coded information (G11B20/1806, G11B20/1866 take precedence)}
- G11B 27/19: by using information detectable on the record carrier
- G11B 27/24: by sensing features on the record carrier other than the transducing track {; sensing signals or marks recorded by another method than the main recording}
- G11B 7/0053: {Reproducing non-user data, e.g. wobbled address, prepits, BCA}
- G11B 20/00086: {Circuits for prevention of unauthorised reproduction or copying, e.g. piracy (indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00)}
- G11B 2020/1221: {cluster, i.e. a data structure which consists of a fixed number of sectors or ECC blocks}
- G11B 2020/1239: {the track being a pregroove, e.g. the wobbled track of a recordable optical disc}
- G11B 2020/1265: {Control data, system data or management information, i.e. data used to access or process user data}
- G11B 2020/1268: {Address in pregroove [ADIP] information}
- G11B 2020/1274: {stored in pre-pits, i.e. in embossed pits, ROM marks or prepits}
- G11B 2020/1287: {Synchronisation pattern, e.g. VCO fields}
- G11B 2020/1292: {Enhancement of the total storage capacity}
- G11B 2020/1298: {Enhancement of the signal quality}
- G11B 2220/216: Rewritable discs
- G11B 2220/218: Write-once discs
- G11B 2220/2537: Optical discs
- G11B 2220/2541: Blu-ray discs; Blue laser DVR 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

On an optical disk medium according to the present invention, address information is recorded along a wobbling track groove 2. The track groove 2 is made up of a plurality of unit sections 22, 23. Each of these unit sections 22, 23 has side faces that are displaced periodically in a disk radial direction. This displacement oscillates at a single period in a tracking direction. However, the displacement pattern differs depending on “each bit of address information (subdivided information)” allocated to each of the unit sections 22, 23.

## Claims

### Claim 1

An optical disk which comprises a track groove and on which information is recorded along the track groove,
wherein the track groove includes a plurality of unit sections that are arranged along the track groove and that have side faces displaced periodically along the track groove, and
wherein the side faces of the unit sections are displaced in a single fundamental period, and
wherein subdivided information allocated to each said unit section is represented by a combination of wobble patterns selected from multiple types of wobble patterns that have been defined so as to correspond to respective signal waveforms that rise and fall mutually differently.

### Claim 2 (depends on 1)

The optical disk of claim 1, wherein the subdivided information allocated to each said unit section is represented by either a first displacement shape or a second displacement shape, the first displacement shape having been defined so as to correspond to a signal waveform that rises relatively steeply and falls relatively gently, the second displacement shape having been defined so as to correspond to a signal waveform that rises relatively gently and falls relatively steeply.

### Claim 3 (depends on 1)

The optical disk of claim 1, wherein the side faces of the track groove are displaced either toward disk inner periphery or disk outer periphery with respect to a center-line of the track groove.

### Claim 4 (depends on 1)

The optical disk of claim 1, wherein the information is recorded on a block-by-block basis, each said block having a predetermined length, and
wherein each said block comprises a number N of unit sections that are arranged along the track groove.

### Claim 5 (depends on 4)

The optical disk of claim 4, wherein part of the side faces that is shared by at least two of the unit sections has a constant displacement period within at least one of the blocks.

### Claim 6 (depends on 1)

The optical disk of claim 1, wherein one-bit subdivided information is allocated to each said unit section, and
wherein a group of subdivided information representing N bits is recorded on the N unit sections that are included in each said block.

### Claim 7 (depends on 6)

The optical disk of claim 6, wherein each said N-bit subdivided information group includes address information of its associated block to which the unit sections, where the subdivided information group is recorded, belong.

### Claim 8 (depends on 7)

The optical disk of claim 7, wherein each said N-bit subdivided information group includes an error correction code and/or an error detection code.

### Claim 9 (depends on 8)

The optical disk of claim 8, wherein the error correction code or the error detection code has its ability to correct an error of the address information weighted in such a manner that low-order bits of the error correction or detection code have a relatively large weight.

### Claim 10 (depends on 7)

A method for reading the address information of each said block from the optical disk as recited in claim 7, the method comprising the steps of:
irradiating the optical disk with light and generating an electric signal responsive to part of the light that been reflected from the optical disk;
generating a wobble signal, which has amplitude changing with the wobble pattern, from the electric signal; and
determining subdivided information, which has been allocated to each of the unit sections included in the block, in accordance with the wobble signal and determining the address information based on the subdivided information.

### Claim 11 (depends on 1)

An apparatus for reading subdivided information from the optical disk as recited in claim 1, the apparatus comprising:
an optical head, which irradiates the optical disk with light and generates an electric signal responsive to part of the light that been reflected from the optical disk;
read signal processing means for generating a wobble signal, which has amplitude changing with the wobble pattern, from the electric signal; and
subdivided information detecting means for determining the subdivided information in accordance with the wobble signal.

### Claim 12 (depends on 1)

A method for reading subdivided information from the optical disk as recited in claim 1, the method comprising the steps of:
irradiating the optical disk with light and generating an electric signal responsive to part of the light that been reflected from the optical disk;
generating a wobble signal, which has amplitude changing with the wobble pattern, from the electric signal; and
determining the subdivided information in accordance with the wobble signal.