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Optical disc and optical disc device

An optical disc and optical head technology, applied in the directions of beam source, optical recording head, optical recording carrier, etc., can solve the problem of not being able to obtain the optimal value of the recording power of the L0 layer, and achieve the effect of reducing the recording capacity and reducing the shrinkage.

Active Publication Date: 2007-05-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is considered that even if the recording of the L1 layer does not affect the recording quality of the L0 layer under the condition of the recording power Pwo1, at the above-mentioned test recording power, the light beam is subjected to intensity changes when passing through the L1 layer. The impact of the influence, can not get the best value of the recording power of the L0 layer (set as Pwo0)

Method used

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  • Optical disc and optical disc device
  • Optical disc and optical disc device
  • Optical disc and optical disc device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0040] FIG. 1 shows the structure of an optical disc 101 according to Embodiment 1 of the present invention, particularly the structure of a first information recording layer.

[0041] On the optical disc 101, a plurality of tracks (tracks) 102 are formed concentrically. Alternatively, a single track 102 may be formed spirally on the optical disk 101, or a plurality of tracks 102 may be formed spirally.

[0042] The area of ​​the optical disc 101 includes a pre-recorded area 103 and a recordable area 104 .

[0043] Various parameters necessary for accessing the optical disc 101 are stored in the pre-recorded area 103 .

[0044] In the recordable area 104, recording learning and recording and reproduction of user data are performed.

[0045] Fig. 2 shows the structure of a single-sided two-layer type optical disc of the present invention.

[0046] In FIG. 2, 201 is a substrate, 202 is a first information recording layer, 203 is a space layer such as an adhesive resin, 204 is...

Embodiment approach 2

[0071] FIG. 8 is a layout diagram showing the radial positional relationship of main parts of the optical disk area in another embodiment of the present invention.

[0072] In this figure, the upper part represents the protection area 503a, the control data area 504a, the protection area 505a, the first test area 506a, the buffer area 507a, the drive management information area 508a, the buffer area 509a, the user data recording area of ​​the first information recording layer. area 510a and a second test area 515a. In this figure, the lower part represents the protected area 503b, the third test area 504b, the reserved area 505b, the protected area 506b, the reserved area 507b, the buffer area 508b, the reserved area 509b, the buffer area 510b, the user data recording layer of the second information recording layer. area 511b and a fourth test area 515b. The rest of the structure and the contents of each area are substantially the same as those of the two-layer optical disc a...

Embodiment approach 3

[0086] An optical disc device for recording on the optical disc described in Embodiment 1 or 2 will be described with reference to FIGS. 9 and 10 .

[0087] FIG. 9 is a block diagram showing the outline of an optical disc device 600 .

[0088] In FIG. 9, 601 is an optical disc. The optical disc 601 has the structure described in the first or second embodiment. Among them, the optical disc device 600 can record on an optical disc having a conventional structure, for example, a single-layer optical disc.

[0089] In addition, 602 is a semiconductor laser, 603 is a collimating lens, 604 is a beam splitter, 605 is a converging mechanism, 606 is a converging lens, 607 is a light detection mechanism, 608 is a reproduction signal calculation mechanism, and 609 is a focus control mechanism. , 610 is a tracking control mechanism, 611 is an actuator, 612 is a controller, 613 is a laser drive mechanism, 615 is a signal processing unit.

[0090] Here, an optical head is constituted by ...

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Abstract

The invention provides a recordable dual-layer optical disc which allows precise recording learning on both layers. A first information recording layer located further from the light incidence side includes a read-only control data area (304a), a first test area (306a), and a second test area (315a). A second information layer located closer to the light incidence side includes a third test area (304b) located at a position opposite to the control data area (304a), and a fourth test area (315b) located at a position opposite to the second test area (315a). Thus, in a two-layer optical disc capable of recording, accurate recording learning on both of the layers can be achieved.

Description

technical field [0001] The present invention relates to an optical disc having two information recording layers and a test area in each layer. In addition, the present invention also relates to an optical disc device for recording on the optical disc. The test area is used for adjusting the various conditions of the drive, for example for learning recording conditions. Background technique [0002] In recent years, with the continuous development of higher density and larger capacity of optical discs, ensuring the reliability of optical discs has become particularly important. In order to ensure this reliability, in an optical disc device for recording or reproducing such an optical disc, recording learning is performed to obtain recording and reproducing conditions for the optical disc (see Patent Document 1). [0003] Recording learning refers to an operation of optimizing pulse conditions related to laser pulses irradiated onto an optical disc. The pulse conditions inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/125G11B7/0045
CPCG11B2007/0013G11B7/24038G11B7/00736G11B7/007
Inventor 石田隆
Owner PANASONIC CORP
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