Adjusting method for disc oblique angle of optical head driving unit based on pulsewidth variation |
Title： |
| Adjusting method for disc oblique angle of optical head driving unit based on pulsewidth variation |
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Application Number： |
200410046359 |
Application Date： |
2004/06/07 |
Announcement Date： |
2005/02/23 |
Pub. Date： |
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Publication Number： |
1585005 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G11B 7/09 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Ma Jianshe, Pan Longfa, Xu Duanyi |
Key Words： |
Adjusting method, disc oblique angle, optical head, driving unit, pulsewidth variation |
Abstract： |
In this method of adjustment, the preliminary searching of the object lensi s processed on the signal layer to collect the S curve. According to the defined upper pulse width T1 and the lower pulse width T2, the bias of the focal plane Td is judged to calculate the angle theta of the disk. By this angle theta, the angle of the disk is adjusted to improve the accuracy and the reliability. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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