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Gain setting method for optical disk reproducing apparatus

A technology of optical discs and reflected light, applied in the direction of optical recording/reproduction/erasing methods, recording/reproduction with optical methods, recording information on magnetic discs, etc., can solve impossible fine copying, reproduction capabilities of optical disc reproduction equipment damage and other problems, to ensure accuracy and stabilize servo operation

Inactive Publication Date: 2007-05-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the dispersion becomes too large to be absorbed, the reproduction capability of the disc reproduction device is destroyed
In this way, it is impossible to perform fine copying, including the case of having fingerprints or the like attached to the surface of the disc

Method used

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  • Gain setting method for optical disk reproducing apparatus
  • Gain setting method for optical disk reproducing apparatus
  • Gain setting method for optical disk reproducing apparatus

Examples

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Embodiment Construction

[0044] A preferred embodiment of a gain setting method for an optical disc reproducing device according to the present invention will be described in detail with reference to the accompanying drawings. Fig. 5 is an example showing a configuration diagram of the optical disk reproducing apparatus. In Fig. 5, reference numeral 100 is an optical disc; 101 is an optical disc rotation device for rotating the optical disc; 102 is a taker, which is provided with a laser emitting portion for emitting laser light to the optical disc and for converting the reflected light from the optical disc. A light-receiving element that converts light into an electrical signal; 103 is a focus actuator, which is used to drive the acquirer vertically upward or downward along the tracking direction through a drive signal; 104 is a tracking actuator, which is used to pass The drive signal drives the acquirer along the tracking direction; 105 is an amplifier, which acquires the focus error signal and th...

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Abstract

The invention provides a gain setting method for setting a gain in an amplifier that amplifies signals obtained from an optical disk, which comprises: a measuring step for measuring an output level of the amplifier; and a gain setting step for setting the gain as the value of the output level / target level, when the measured output level is 1 / N-N times (N is an integer of 2 or larger) with respect to the preset target level.

Description

technical field [0001] The present invention relates to a gain setting method for an optical disc reproducing device such as a compact disc (CD) player. Background technique [0002] Recently, rewritable recordable CDs known as compact discs to read and write (CD-RW) have been developed. In addition, for non-rewritable recordable CDs, namely compact discs read only (CD-R), a low reflective disc for such CD-Rs has also been developed. In a conventional optical disc reproducing apparatus disclosed by Japanese Laid-Open Patent Document (Japanese Unexamined Patent Publication 2000-100059), a function for such a recordable CD is included, which can switch the amplifier gain in two stages , that is, the gain obtained is 1 or 4 times the normal gain. In a conventional optical disc reproducing apparatus, both a highly reflective CD and a low reflective CD can be reproduced by switching the gain of an amplifier. [0003] Fig. 7 is a flow chart of a conventional disc identification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/00G11B7/004G11B19/12G11B20/00
CPCG11B2007/0006G11B7/0941
Inventor 畑中规男西尾亮一石川良一太田敬之
Owner PANASONIC CORP