Method and apparatus for adjusting focusing bias of optical disk drive unit |
Title： |
| Method and apparatus for adjusting focusing bias of optical disk drive unit |
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Application Number： |
200510022067 |
Application Date： |
2005/11/09 |
Announcement Date： |
2006/07/12 |
Pub. Date： |
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Publication Number： |
1801347 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
94[China|shenzhen] |
IPC： |
G11B 7/085, G11B 7/09, G11B 21/00, G11B 20/00 |
Applicant(s)： |
Graduate School at Shenzhen, Tsinghua University |
Inventor(s)： |
Ma Jianshe, Zhang Jianyong, Fan Jiliang, Yang Mingsheng, Sun Manlong, Li Hui, Han Xiaopeng, Tang Yi, Pan Longfa, Mao Leshan, Xu Duanyi |
Key Words： |
Method, apparatus, adjust, focusing bias, optical disk, drive unit |
Abstract： |
The invention relates to a method and an apparatus for adjusting focusing bias of CD driving unit. The method comprises steps of: A. applying driving voltage to focus force device in CD driving unit and making the distance between object lens in the CD driving unit and CD float by taking a standard distance as center; B. laser light spot which is irradiated on CD being reflected on optical head detector; C. the optical head detector converting the received light spot into electronic signal and getting focusing error signal curve; D. according to the occurrence time of the extreme value in the focusing error signal curve, getting the corresponding driving value which is the extreme value occurrence voltage value; E. by adjusting the standard distance, making the extreme value occurrence voltage value in a setting range and getting the adjusted distance. |
Claim： |
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Priority： |
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PCT： |
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