# US 2013/0155824 A1 · Optical disc device and optical disc recording method

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- Number: US 2013/0155824 A1
- Document ID: US20130155824A1
- Status: Published application
- Kind: A1
- Application number: 13/711,252
- Filed: 2012-12-11
- Published: 2013-06-20
- Earliest claimed: 2011-12-14
- Assignees: Hitachi Consumer Electronics Co., Ltd.
- Inventors: Tomomi OKAMOTO
- Web page: https://patentgrep.com/patent/US20130155824A1

## CPC

- 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 7/0953: {to compensate for eccentricity of the disc or disc tracks}
- G11B 7/0045: Recording (G11B7/006, G11B7/0065 take precedence)
- G11B 7/0956: {to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc}
- G11B 7/2405: being also used as track layers of pre-formatted layers (tracks or pits G11B7/2407)
- 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

On the occasion of providing a guard track and additionally recording data in an optical disc provided with a guide layer having a physical groove structure for carrying out tracking servo control and not having a land/groove structure in recording layers carrying out recording and playback, it has sometimes occurred that it was difficult to reposition a light spot. Given that there are a recorded area and an unrecorded area in a recording layer, recording with respect to the concerned recording layer is taken to be impossible to implement when the recording capacity of the unrecorded area is less than a prescribed value.

## Claims

### Claim 1

An optical disc device carrying out data recording or playback with respect to an optical disc formed by being provided with a guide layer having a physical groove structure for carrying out tracking servo control and stacking recording layers carrying out recording and playback, comprising:
a first optical system which focuses a light beam on the guide layer and detecting the reflected light therefrom; and
a second optical system which focuses a light beam on the recording layers and detecting reflected light therefrom,
there being, in any of the recording layers, a recorded area in which recording of the data has been completed and an unrecorded area in which data have not yet been recorded; and that, in the case where the recording capacity of the unrecorded area is equal to or greater than a prescribed threshold value, takes additional data recording by means of the second optical system to be possible to implement, and when the recording capacity of the unrecorded area is less than the prescribed threshold value, takes additional data recording with respect to the recording layer to be impossible to implement.

### Claim 2 (depends on 1)

The optical disc device according to claim 1, wherein,
on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and additionally recording the data, is taken to be impossible when the recording capacity of the unrecorded area is less than the recording capacity necessary for the generation of a guard track.

### Claim 3 (depends on 1)

The optical disc device according to claim 1, wherein,
if the number of guard tracks is taken to be n, the track pitch is taken to be Tp, the amount of optical disc eccentricity is taken to be d, the recording capacity per unit recording width of a radial position in the proximity of the unrecorded area is taken to be A, and the recording capacity of the unrecorded area is taken to be R; and implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and recording additionally, is taken to be impossible on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, in the case where
R<A×(n·Tp+d)
is satisfied.

### Claim 4 (depends on 1)

The optical disc device according to claim 1, further comprising a stepping motor moving the first optical system and second optical system in a radial direction of the optical disc,
wherein the movement quantity per pulse of the stepping motor is taken to be c and,
if the number of guard tracks is taken to be n, the track pitch is taken to be Tp, the amount of optical disc eccentricity is taken to be d, the recording capacity per unit recording width of a radial position in the proximity of the unrecorded area is taken to be A, and the recording capacity of the unrecorded area is taken to be R, implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and recording additionally, is taken to be impossible on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, in the case where
R<A×(n·Tp+d+c)
is satisfied.

### Claim 5 (depends on 3)

The optical disc device according to claim 3, wherein the amount of eccentricity d is taken to be the maximum allowable eccentricity value defined in the specification of the optical disc system.

### Claim 6 (depends on 1)

The optical disc device according to claim 1, wherein, in the case where an additional data recording in the unrecorded area of the recording layer is impossible to implement and in the case where there is a recordable unrecorded area in another recording layer, data recording is continued with respect to the other recording layer.

### Claim 7

An optical disc device recording method carrying out data recording with respect to an optical disc formed by being provided with a guide layer having a physical groove structure for carrying out tracking servo control and stacking recording layers carrying out recording and playback,
wherein the optical disc device has a first optical system focusing a light beam on the guide layer and detecting the reflected light therefrom and a second optical system focusing a light beam on the recording layers and detecting reflected light therefrom,
there being, in any of the recording layers, a recorded area in which recording of the data has been completed and an unrecorded area in which data have not yet been recorded, and, in the case where the recording capacity of the unrecorded area is equal to or greater than a prescribed threshold value, takes additional data recording by means of the second optical system to be possible to implement, and when the recording capacity of the unrecorded area is less than the prescribed threshold value, takes additional data recording with respect to the recording layer to be impossible to implement.

### Claim 8 (depends on 7)

The recording method according to claim 7, wherein, on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and additionally recording the data, is taken to be impossible when the recording capacity of the unrecorded area is less than the recording capacity necessary for the generation of the guard track.

### Claim 9 (depends on 7)

The recording method according to claim 7, wherein, if the number of guard tracks is taken to be n, the track pitch is taken to be Tp, the amount of optical disc eccentricity taken to be d, the recording capacity per unit recording width of a radial position in the proximity of the unrecorded area is taken to be A, and the recording capacity of the unrecorded area is taken to be R; and implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and recording additionally, is taken to be impossible on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, in the case where
R<A×(n·Tp+d)
is satisfied.

### Claim 10 (depends on 7)

The recording method according to claim 7, wherein the optical disc device has a stepping motor moving the first optical system and second optical system in a radial direction of the optical disc and the movement quantity per pulse of the stepping motor is taken to be c and,
if the number of guard tracks is taken to be n, the track pitch is taken to be Tp, the amount of optical disc eccentricity is taken to be d, the recording capacity per unit recording width of a radial position in the proximity of the unrecorded area is taken to be A, and the recording capacity of the unrecorded area is taken to be R; and implementation of additional data recording with respect to the recording layer, with a method of providing a guard track and recording additionally, is taken to be impossible on the occasion of carrying out a judgment on the implementation of additionally recording data after the recorded area, in the case where
R<A×(n·Tp+d+c)
is satisfied.

### Claim 11 (depends on 9)

The recording method according to claim 9, wherein the amount of eccentricity d is taken to be the maximum allowable eccentricity value defined in the specification of the optical disc system.

### Claim 12 (depends on 7)

The recording method according to claim 7, wherein, in the case where an additional data recording in the unrecorded area of the recording layer is impossible to implement and in the case where there is a recordable unrecorded area in another recording layer, data recording is continued with respect to the other recording layer.

### Claim 13 (depends on 4)

The optical disc device according to claim 4, wherein the amount of eccentricity d is taken to be the maximum allowable eccentricity value defined in the specification of the optical disc system.

### Claim 14 (depends on 10)

The recording method according to claim 10, wherein the amount of eccentricity d is taken to be the maximum allowable eccentricity value defined in the specification of the optical disc system.