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Optical disk device

An optical disc device, optical disc technology, applied to head configuration/installation, optical recording/reproduction, instruments, etc., can solve problems such as inability to ensure reproduction endurance

Inactive Publication Date: 2011-05-11
HITACHI-LG DATA STORAGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of a recording type optical disk, simply increasing the direct current and high-frequency superimposed current supplied to the laser diode cannot ensure the so-called reproduction endurance.

Method used

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Experimental program
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Embodiment Construction

[0028] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0029] (1) Configuration of the optical disc device of the present embodiment

[0030] exist figure 1 Among them, 1 represents the optical disc device of this embodiment as a whole. This optical disc device 1 includes an optical pickup 3, a microcomputer 4, an analog signal processor 5, and a digital signal processor 6, and is configured with an optical disc 2 loaded therein.

[0031] The optical pickup 3 irradiates laser light onto the optical disc 2 , detects the reflected light, converts it into an electrical signal by photoelectric conversion, and supplies it to the analog signal processor 5 . Further, the optical pickup 3 includes a laser diode 31 , a laser driver 32 , a beam splitter 33 , a power monitor 34 , a polarization beam splitter 35 , a detector 36 , a quarter wave plate 37 and an objective lens 38 .

[0032] The laser diode 31 emits laser light with...

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Abstract

Proposed is an optical disk device capable of optimally adjusting a current value of a direct current and a high frequency superimposed current for driving a laser diode. This optical disk device includes a laser driver for superimposing a high frequency current on a direct current to obtain a drive current and supplying the drive current to the laser beam source and driving the laser beam source, and a control unit for adjusting a current value of the direct current and / or the high frequency superimposed current supplied by the laser driver to the laser beam source based on the servo signal or the reproduction signal. The control unit adjusts the current value of the direct current and / or the high frequency superimposed current so that a value representing a waveform fluctuation of the servo signal or the reproduction signal satisfies a specified value of the waveform fluctuation, a value representing a reproduction performance of the reproduction signal satisfies a specified value of the reproduction performance, and a value representing a durability performance of the optical disk in relation to the laser beam satisfies a specified value of the durability performance.

Description

technical field [0001] The present invention relates to an optical disc device for reproducing an optical disc, and is applicable, for example, to an optical disc device capable of reproducing an optical disc having a plurality of recording layers. Background technique [0002] In recent years, in BD (Blu-ray) standard optical discs, a technique of enlarging the recording layer in order to increase the recording capacity has been proposed, and a dual-layer optical disc has already been put into practical use. It is expected that an optical disc having three or more recording layers (hereinafter referred to as a multi-layer optical disc) will become practical in the future in order to achieve a further increase in capacity. [0003] However, in reproduction of a multilayer optical disc, the reproduction quality tends to deteriorate due to a reduction in the reflectivity of the recording layer. Therefore, this problem is solved by increasing the direct current and the high-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/13G11B7/09
CPCG11B7/1263G11B2007/0013
Inventor 盐泽学
Owner HITACHI-LG DATA STORAGE