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Focusing position regulating method and system thereof

A focus position and reference position technology, applied in the field of focus position adjustment and its system, to save time, avoid jitter value calculation, and increase efficiency

Inactive Publication Date: 2004-11-03
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the main purpose of the present invention is to provide a focus position adjustment method and its system to solve the problems of the traditional technology

Method used

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  • Focusing position regulating method and system thereof
  • Focusing position regulating method and system thereof
  • Focusing position regulating method and system thereof

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Embodiment Construction

[0030] see figure 1 . figure 1 It is a schematic diagram of an optical read-write device 10 applying the focus position adjustment system of the present invention. The focusing position adjusting system of the present invention is used to adjust a focusing position when an optical read-write device 10 reads an optical storage medium 12 .

[0031] The optical read-write device 10 includes an optical read-write head 14 (optical head) and a servo control unit 15 (servo control unit). The optical storage medium 12 is rotated at a rotational speed by a spindle motor 18 , so that the optical read-write head 14 reads or writes to the optical storage medium 12 . The optical storage medium 12 , especially a DVD-RAM, has a plurality of spiral recording tracks on which at least a header area (header) and a recording field (recording field) are used for recording digital files. Generally, when the optical read / write device 10 reads the header area and the recordable area, its focusing ...

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Abstract

The focusing position regulating method and system is used in regulating the focusing position of optical read / write device for reading optical storing medium. The optical storing medium is provided with one header and one recording field. The optical read / write device produces one focusing error signal for controlling the focusing of the optical pickup head. The focusing position regulating method is that after the optical read / write device tracks close loop, the focusing position is so regulated that the deviation value of the focusing error signal in the header and the recording field is within some preset range. The system includes one deviation value detecting module for detecting the deviation value and one focusing control module for regulating the focusing position.

Description

technical field [0001] The present invention relates to a focus position adjustment method and its system, in particular to a focus position adjustment method and its system applied to an optical read-write device. Background technique [0002] A conventional optical disk drive has an optical head for generating a laser beam to irradiate on an optical disk and receiving a laser beam reflected from the optical disk. In order for the optical disc drive to correctly read data on the optical disc or write data into the optical disc correctly, the optical disc drive needs to perform focus servo control and tracking servo control. The focus servo is to control the laser beam emitted by the optical disc drive to the optical disc, so that the laser beam can be focused on a specific focus position. Conventional focus servo control is accomplished based on a focus error signal generated by a light beam reflected from an optical disc. The focus error signal represents the shift of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/09G11B7/131G11B7/1381
Inventor 罗吉钧谢坤宏
Owner MEDIATEK INC
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