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Device and method for obtaining optimum servo gain in optical record playing system

A playback system and optical recording technology, applied in optical recording/reproduction/erasing methods, optical recording/reproduction, head configuration/installation, etc., can solve servo instability, excessive or insufficient variation, etc. problem, to achieve the effect of improving quality, eliminating servo error gain deviation, and improving performance

Inactive Publication Date: 2008-10-29
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there will be a difference between the servo error gain and the gain of the playback power supply during the recording process, the difference in the change of the servo error gain will be too large or insufficient, so the servo will become unstable during recording.

Method used

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  • Device and method for obtaining optimum servo gain in optical record playing system
  • Device and method for obtaining optimum servo gain in optical record playing system
  • Device and method for obtaining optimum servo gain in optical record playing system

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Embodiment Construction

[0021] Hereinafter, configurations of preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] Fig. 2 is a schematic illustration of an eraser power supply level circuit in an FPDO to illustrate the method for obtaining the best servo gain in an optical recording and playback system according to the design method of the present invention.

[0023] Referring to FIG. 2 and FIG. 3 , the device and method for obtaining the best servo gain in the optical recording and playback system of the present invention are described as follows.

[0024] First of all, in order to obtain the FPDO standard level, the optical recording and playback system stores the measured FPDO level value in the variable Vref when the LD output is not in progress, and then measures the FPDO level of the playback power supply under the optical disc playback state, and puts The deviation between this value and the value of Vref is stored in ...

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PUM

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Abstract

The invention relates to a record play system, especially a device for obtaining best servo increment in the record play system and a relative method, wherein the method for obtaining best servo error increment is formed by five steps that 1, testing and storing the FPDO level before playing disc; 2, obtain the difference between the FPDO level of tested disc play state and the FPDO level before playing disc; 3, after obtaining the difference, starting OPC and testing the eraser power level when recording; 4, obtaining the difference between the third level value and the second difference value, and obtaining the different between the play power source and the eraser power resource when recording; 5, correcting the difference.

Description

【Technical field】 [0001] The present invention is related to recording and playback system, especially the device and method for obtaining the best servo gain in the optical recording and playback system. 【Background technique】 [0002] FIG. 1 is a recording waveform diagram of a common optical recording playback medium. When rewriting CD-RW, change the intensity of the laser light to irradiate the medium, and make use of the eraser power (PEO) level for recording servo signals (focus, search) during recording. [0003] The eraser power rating is much higher than the playback power (PRO) rating. Due to the different media and recording accessories, the power level of ordinary playback is 1mW~1.5mW, and the power level of eraser is 8mW~15mW. In order to obtain the servo signal, in a certain family, the power supply of the eraser has nothing to do with the media or accessories, and at the servo amplifier end of the optical recording and playback system, the gain is reduced b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/004G11B7/09G11B20/00
Inventor 金相雨
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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