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Method for multi-condition testing of optical head moment apparatus dynamic pappmeter

A technology of dynamic parameters and torquer, which is applied in the field of multi-state testing of dynamic parameters of optical head torquer, can solve the problems of not being able to reflect the working performance of the torquer well, the test method is not comprehensive, and the performance cannot be fully guaranteed.

Inactive Publication Date: 2005-10-26
TSINGHUA UNIV +1
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AI Technical Summary

Problems solved by technology

Testing a torquer with good performance in the free state does not fully guarantee good performance in actual work, so the test method that only tests the dynamic performance of the torquer in the free state is not comprehensive and cannot well reflect the actual working performance of the torquer

Method used

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Embodiment Construction

[0026] The method for multi-state test optical head torque device dynamic parameter that the present invention proposes, at first make torque device be in free state; Under the different frequency f from low to high output the sinusoidal signal of fixed amplitude A respectively; Torque device is in above-mentioned sinusoidal signal Driven by the drive, the jitter is generated in the focusing direction or the tracking direction; a beam of laser light is irradiated on the reflection point of the torque converter objective lens, and the jitter speed in the focusing direction or the tracking direction at the reflection point on the objective lens is measured; the above speed signal Integrating, the displacement response signal of the point in the focusing direction or tracking direction under the excitation of the above-mentioned sinusoidal signal with frequency f is Y(f)=B(f)∠φ(f), where B(f) is the torque φ(f) is the displacement response of the torquer in the focusing direction ...

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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.

Description

technical field [0001] The invention relates to a multi-state method for testing the dynamic parameters of an optical head torquer, in particular to a multi-state method for testing the dynamic parameters of an optical head torquer in an optical disc drive, and belongs to the technical field of optical storage device performance testing. Background technique [0002] In an optical disc system, the torquer is the actual implementation part of the servo action of the optical head. Its function is to drive the objective lens to move in real time according to the error signal obtained by the optical head during the optical disc reading process, that is, the focusing and tracking error signals, so that the focused spot can overcome the spot caused by the ups and downs of the optical disc in the focusing direction of the disc. And the offset of the tracking direction, so as to accurately fall on the information track of the optical disc, and realize high-quality data reading and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00
Inventor 马建设汝继刚潘龙法吴建明徐端颐季建东朱建标张建勇史洪伟李莉华唐毅
Owner TSINGHUA UNIV
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