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Optical disk device

A technology of optical disc device and light spot, which is applied to the configuration/installation of the head, recording/reproduction with optical methods, instruments, etc., which can solve the problems of detection of undisclosed track deviation, and achieve the effect of suppressing false detection

Active Publication Date: 2009-12-09
HITACHI CONSUMER ELECTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In addition, although Patent Document 4 discloses using a wobble signal to determine the moving direction of a light beam, it does not disclose detection of track deviation using wobble.
Also, no consideration is given to track deviations in the recording

Method used

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Embodiment Construction

[0036] Next, examples of the present invention will be described.

[0037] Compared to the description of previous methods figure 2 , in the description of the embodiment of the present invention figure 1 Some functions have been added. First, use figure 2 The conventional track deviation detection method will be described, and then the track deviation detection method of the present embodiment will be described.

[0038] figure 2 Among them, 1 is a disk; 2 is an objective lens; 3 is a focus actuator that drives the objective lens in the direction of the rotational axis of the disk; 4 is a tracking actuator that drives the objective lens in the radial direction of the disk; 5 is an optical pickup unit; 6 is a seek motor that drives the optical pickup unit in the radial direction of the disc; 7 is a photodetector; 8 is a focus error signal generation unit that generates an error signal of the disc and the objective lens in the focus direction; 9 is a control focus actuat...

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PUM

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Abstract

There is a need to prevent a possible erroneous detection of an off-track condition by using a tracking error signal. The invention provides an optical disk device, comprising: an optical pickup including an objective lens, a focus actuator, a tracking actuator, a focus error signal generator, a tracking error signal generator, a focus actuator controller, a tracking actuator controller, a wobble signal generator, a first off-track detector, a zero-cross detector, a second off-track detector, an off-track determination unit and a system controller.

Description

technical field [0001] The present invention relates to an optical disc device, in particular to a servo deviation detection method in recording. Background technique [0002] As the background art in this technical field, there are, for example, JP-A-2001-344773, JP-A-8-30990, JP-A-2003-173551, and the like. These publications use the signal amplitude of the tracking error signal to judge the tracking servo deviation. [0003] In addition, as other background art, there is, for example, Japanese Patent Application Laid-Open No. 2005-174389. This gazette describes as the problem that "the modulation signal of the sum signal cannot be detected, it is difficult to measure the phase difference with the tracking error signal, and the moving direction of the beam cannot be judged", and as the solution, it is described as "equipped with a push-pull signal generating push-pull signal". A signal generation unit, and an on-track / off-track signal for judging the on-track / off-track s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09
CPCG11B7/094
Inventor 今川制时石川义典
Owner HITACHI CONSUMER ELECTRONICS CORP