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Optical disc apparatus and method for controlling the same

An optical disc device, optical disc technology, applied in the directions of beam guiding device, recording/reproducing by optical method, optical recording head, etc., can solve problems such as focus control separation, and achieve the effect of stabilizing recording or reproduction quality

Inactive Publication Date: 2015-06-03
HITACHI CONSUMER ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When recording or reproducing an optical disc with multiple recording layers, when jumping between layers is performed to change the layer to be recorded or reproduced, there is a new problem of loss of focus control

Method used

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  • Optical disc apparatus and method for controlling the same
  • Optical disc apparatus and method for controlling the same
  • Optical disc apparatus and method for controlling the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In recent years, as a new problem in the recording or reproduction of optical discs in which the recording layers are multilayered on one side, when the layer to be recorded or reproduced is changed by interlayer jump, the focus control is lost and the interlayer jump fails. question. Therefore, it is an object of the present invention to provide an optical disc device capable of suppressing the failure of interlayer jump and obtaining good recording or reproduction quality even in an optical disc having multiple recording layers.

[0027] figure 1 It is a schematic configuration diagram showing an example of the optical disc device of the present invention. In this embodiment, the optical disc 1 is rotated by the spindle motor 2, the optical disc 1 is irradiated with the laser beam 4 emitted from the laser light source mounted on the optical pickup device 3, and the reflected light from the optical disc is detected by a light receiving element, thereby recording data....

Embodiment 2

[0046] The second embodiment will be described. In this embodiment, the reliability of the optical disk device can be further improved by applying the objective lens shift position P obtained by the learning processing described in the first embodiment to control processing other than the interlayer jump.

[0047] The structure of the optical disc device in this embodiment can be, for example, the same as figure 1 The optical disc device shown has the same structure. The difference from the first embodiment is that the above-mentioned objective lens shift amount P is also used in other control processes besides the interlayer jump process.

[0048] Hereinafter, the focus control processing using the above-mentioned objective lens shift amount P will be specifically described.

[0049]The first application object of the lens shift position P is focus pull-in processing. When starting recording or reproduction, the optical disc device performs a focus pull-in process so that ...

Embodiment 3

[0055] The third embodiment will be described. In this embodiment, the time required to learn the shift position P of the objective lens at which the FE signal imbalance becomes smaller is shorter than that in the first embodiment, thereby improving the convenience for the user of the optical disc device.

[0056] The structure of the optical disc device in this embodiment, for example, can be figure 1 The optical disc device shown has the same structure.

[0057] The difference from the first embodiment lies in the learning processing method for finding the objective lens shift position P at which the FE signal imbalance becomes small. In the learning method in the first embodiment, the FE signal is obtained by scanning the objective lens in the focus direction at each of the plurality of objective lens shift positions, and therefore time-consuming learning is required. On the other hand, this embodiment focuses on the PP signal used when generating the TE signal in the DPP...

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Abstract

In recording or reproducing data on or from an optical disc with recording multi-layers, the focusing is likely to be out of control when an inter-layer jumping is carried out for changing a recording layer on or from which data is to be recorded or reproduced to another one. An optical disc apparatus is arranged to obtain an objective lens shift position that makes the focus signal S-character waveform better balanced in advance by learning and to carry out the inter-layer jumping at the shift position when jumping an optical pickup from one layer to another on a multilayered optical disc. The jumping at this shift position makes it possible to prevent out of focus and to stably make the recording or reproducing quality excellent.

Description

technical field [0001] The present invention relates to an optical disc device capable of recording or reproducing an optical disc having multiple recording layers. Background technique [0002] As background art in this technical field, there is, for example, JP-A-2009-59468 (Patent Document 1). This gazette states that "for a multilayer optical disc having at least a first recording layer and a second recording layer, an objective lens having a numerical aperture of 0.8 or more is used to perform recording or reproduction while performing stable layer jumps." [0003] In recent years, the following problems have arisen in the recording and reproduction of optical discs with multiple recording layers. When recording or reproducing an optical disc with multiple recording layers, when jumping between layers is performed to change the layer to be recorded or reproduced, there is a new problem of loss of focus control. [0004] Patent Document 1: Japanese Unexamined Patent Pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G11B7/09G11B7/085
CPCG11B7/08511G11B7/0945G11B2007/0013
Inventor 中村俊辉
Owner HITACHI CONSUMER ELECTRONICS CORP