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Optical disk device and gain regulating method for optical disk device

An optical disc device, gain adjustment technology, applied in the recording/reproducing by optical method, optical recording/reproducing/erasing method, configuration/installation of head, etc., can solve the problems of output saturation of tracking servo system, out of tracking and the like

Inactive Publication Date: 2003-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after a rough search from the recorded surface 20 to the unrecorded surface 21, the TEAGCG adjustment value remains larger than the ideal value, and the output of the tracking servo system is saturated, which may lead to a loss of tracking.

Method used

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  • Optical disk device and gain regulating method for optical disk device
  • Optical disk device and gain regulating method for optical disk device
  • Optical disk device and gain regulating method for optical disk device

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Embodiment Construction

[0023] Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. In addition, the medium targeted by the present invention is a medium in which a recorded area and an unrecorded area coexist or have the possibility of coexisting, more specifically, an optical disc, especially a DVD-RAM, DVD-R, DVD-RW , CD-R, CD-RW and other media. In the following description, it is abbreviated as an optical disk for simplicity.

[0024] figure 1 It is a configuration diagram of the optical disc device in Embodiment 1 of the present invention. Additionally, with Figure 4 The same constituent elements of the shown conventional optical disc device are denoted by the same reference numerals, and the description of the conventional optical disc device is still used, and repeated descriptions are omitted.

[0025] exist figure 1 In the figure, it is shown that the disc 1 and the disc motor 2, the optical pickup 3, the level shifter 4, the driver 5, ...

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Abstract

The present invention provides an optical disc device and a gain adjustment method for the optical disc device. The optical disc device comprises: a memory part (22) storing the gain adjustment value of the AS control system before the rough search; A gain correction device (30) composed of a judging unit (23) moving towards the unrecorded surface and a calculation and setting unit (24) for correcting the gain adjustment value of the tracking control system, when it is determined that it is a rough search from the recording surface to the unrecorded surface In the case of , the adjustment value of the tracking control system gain is corrected based on the rate of change of the AS control system gain before and after the rough search, since saturation of the tracking control system gain can be prevented, and a stable rough search can be performed. Even when moving from the recorded surface to the unrecorded surface, the seek process can be performed stably.

Description

technical field [0001] The present invention relates to an optical disc device and a tracking servo circuit gain adjustment method that perform gain adjustment to keep the output of the entire focus and tracking servo system constant. Background technique [0002] Conventionally, in an optical disc device, an optical pickup irradiates laser light onto a recording surface of an optical disc, receives the reflected light, detects a change in reflectance, and thereby reads information recorded on the optical disc. However, there is no way to avoid surface shaking between the optical disc and the optical pickup. Therefore, when data is reproduced and written, the objective lens of the optical pickup is used to control the laser so that it always maintains a constant focal length on the signal recording surface of the optical disc. Furthermore, the signal used to detect the focus error at this time is a focus error signal (hereinafter referred to as FE signal). [0003] On the o...

Claims

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Application Information

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IPC IPC(8): G11B7/09G11B7/085
CPCG11B7/08505G11B7/0941G11B7/09
Inventor 丈下博美
Owner PANASONIC CORP