# US 7,609,605 B2 · Optical storage medium, optical read/write apparatus, and optical read/write method

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- Number: US 7,609,605 B2
- Document ID: US7609605B2
- Status: Granted
- Kind: B2
- Application number: 11/701,684
- Filed: 2007-02-02
- Published: 2007-06-21
- Granted: 2009-10-27
- Earliest claimed: 2001-05-18
- Assignees: Sharp Kabushiki Kaisha
- Inventors: Junji Hirokane; Noboru Iwata
- Web page: https://patentgrep.com/patent/US7609605B2

## CPC

- G11B 7/126: Circuits, methods or arrangements for laser control or stabilisation
- G11B 7/0045: Recording (G11B7/006, G11B7/0065 take precedence)
- G11B 7/00454: {involving phase-change effects}
- 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 7/1267: Power calibration
- G11B 7/24: Record carriers characterised by shape, structure or physical properties, or by the selection of the material (characterised by the arrangement of information on the carrier G11B7/007)
- G11B 7/24038: Multiple laminated recording layers
- 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 20/00195: {using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses}
- G11B 20/0021: {involving encryption or decryption of contents recorded on or reproduced from a record carrier}
- G11B 20/00253: {wherein the key is stored on the record carrier}
- G11B 7/00718: {Groove and land recording, i.e. user data recorded both in the grooves and on the lands}
- G11B 7/263: {Preparing and using a stamper, e.g. pressing or injection molding substrates (production of optical record carriers, e.g. optical discs B29D17/005)}
- G11B 2007/0013: {for carriers having multiple discrete layers}
- 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 read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the optical read/write apparatus operates so that data is read/written from/into a second data storage layer after fully recording a recordable area of a first data storage layer. Thus, light can be shone with uniform intensity across the substantially entire recordable area of the second data storage layer without using a complex read/write system even under such conditions that the transmittance to light of the first data storage layer in the recordable area may vary depending on whether any data is recorded in the recordable area.

## Claims

### Claim 1

An optical read/write apparatus, comprising:
illumination means for supplying a read/write light beam;
optical storage medium mounting means for supporting an optical storage medium such that said read/write light beam from said illuminating means strikes only a light-striking side of said optical storage medium,
said optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers by means of a light beam striking said light-striking side of said optical storage medium, wherein:
said optical storage medium is structured and configured such that a recordable area of a first data storage layer including at least one recordable extended area portion is provided above a second data storage layer in a direction in which the first and second data storage layers are stacked, and said at least one recordable extended area portion extends in a radial direction of said optical storage medium past an entire recordable area of the second data storage layer, and, further, wherein
said first data storage layer is located closest to said light-striking surface of said optical storage medium, and the second data storage layer is located next to the first data storage layer, away from said light-striking surface.

### Claim 2

An optical read/write method comprising the steps of:
providing a read/write apparatus comprising:
illumination means for supplying a read/write light beam;
optical storage medium mounting means for supporting an optical storage medium such that said read/write light beam from said illuminating means strikes only a light-striking side of said optical storage medium,
said optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers by means of a light beam striking said light-striking side of said optical storage medium, wherein:
said optical storage medium is structured and configured such that a recordable area of a first data storage layer including at least one recordable extended area portion is provided above a second data storage layer in a direction in which the first and second data storage layers are stacked, and said at least one recordable extended area portion extends in a radial direction of said optical storage medium past an entire recordable area of the second data storage layer, and, further, wherein
said first data storage layer is located closest to said light-striking surface of said optical storage medium, and the second data storage layer is located next to the first data storage layer, away from said light-striking surface; and
reading and/or writing data from/to at least one of the stacked data storage layers.

### Claim 3

An optical read/write method comprising the steps of:
providing a read/write apparatus comprising:
illumination means for supplying a read/write light beam; and
optical storage medium mounting means for supporting an optical storage medium such that said read/write light beam from said illumination means strikes only a light-striking side of said optical storage medium,
said optical storage medium including stacked data storage layers that each are readable/writeable separately from the other layers by means of a light beam striking said light-striking side of said optical storage medium, wherein said optical storage medium is structured and configured such that a recordable area of a first layer including at least one recordable extended area portion is provided above a second data storage layer in a direction in which said first and second data storage layers are stacked, and at least one recordable extended area portion extends in a radial direction of said optical storage medium past an entire recordable area of said second storage layer, and further wherein said first data storage layer is located closest to said light-striking surface of said optical storage medium, and said second data storage layer is located next to said first data storage layer away from said light-striking surface; and wherein control means controls said illuminating means so as to write test data in a least one of said at least one extended area portion; and
writing test data in said at least one of said at least one extended area portion.