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Method for testing axial rotation defect of optical head moment apparatus

A technology of axial rotation and detection method, which is applied in the manufacture of optical heads, optical recording heads, instruments, etc., can solve problems such as ineffective detection, achieve the effect of improving production technology and ensuring product quality

Inactive Publication Date: 2008-02-13
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no method that can effectively detect this defect in production practice

Method used

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  • Method for testing axial rotation defect of optical head moment apparatus
  • Method for testing axial rotation defect of optical head moment apparatus

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Experimental program
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Embodiment Construction

[0020] The detection method of the axial rotation defect of the optical head torquer proposed by the present invention firstly outputs the sinusoidal signal of fixed amplitude A respectively under the different frequency f from low to high; Or jitter in the tracking direction; let a beam of laser light shine on the reflection point of the torquer objective lens, and measure the focus direction or the jitter speed in the tracking direction at the reflection point on the objective lens; integrate the above speed signal to get the point Under the excitation of the above-mentioned sinusoidal signal with frequency f, the displacement response signal in the focusing direction or tracking direction is Y(f)=B(f)∠φ(f), where B(f) is the torque device at the corresponding frequency f The magnitude of the displacement response signal in the focusing direction or the tracking direction driven by the sinusoidal signal of the torque device, φ(f) is the difference between the displacement res...

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Abstract

The invention relates to a method for detecting axial rotating defect of moment instrument of an optical head, firstly outputting sine signals at different frequencies; driving the moment instrument to dither in the focusing or tracking direction; casting a laser beam upon a 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, drawing amplitude-frequency characteristic curves for focusing and tracking coils of the moment instrument and obtaining first order resonance frequencies of the focusing and tracking coils; according to the amplitude-frequency characteristic curves, judging the axial rotating defect of the moment instrument. The method is used to improve production technology and ensure the quality of product.

Description

technical field [0001] The invention relates to a detection method for an axial rotation defect of an optical head torquer, in particular to a defect detection method for 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 writing. [0003] The dynamic perform...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/22G01D21/00G11B20/00
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秦利琴
Owner TSINGHUA UNIV