Method for multi-condition testing of optical head moment apparatus dynamic pappmeter |
Title： |
| Method for multi-condition testing of optical head moment apparatus dynamic pappmeter |
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Application Number： |
200510066028 |
Application Date： |
2005/04/22 |
Announcement Date： |
2005/10/26 |
Pub. Date： |
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Publication Number： |
1687988 |
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 20/00G11B 21/02G01D 21/00 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Ji Jiandong, Li Lihua, Ma Jianshe, Pan Longfa, Ru Jigang, Shi Hongwei, Tang Yi, Wu Jianming, Xu Duanyi, Zhang Jianyong, Zhu Jianbiao |
Key Words： |
multi-condition testing, optical head, moment apparatus, dynamic pappmeter |
Abstract： |
The invention relates to a multimode testing method of dynamic parameters of moment instrument of an optical head, firstly making the moment instrument in a free state; outputting sine signals at different frequencies; driving the moment instrument to dither in the focusing or tracking direction; making a laser beam irradiate the reflecting point of an objective of the moment instrument to measure the dithering speed at the reflecting point; integrating the speed signal to obtain displacement response signals of the reflecting point by the excitation of the sine signals, and drawing an amplitude-frequency curve and a phase-frequency curve for focusing or tracking coil of the moment instrument, to obtain all the dynamic parameters of the focusing or tracking coil; applying different voltage biases to the focusing coil and the tracking coil to test all the dynamic parameters of the moment instrument. The test result completely and accurately represents the actual operating performance of a moment instrument all the more. |
Claim： |
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