Method and apparatus of measuring axial vibration of a disk...

Details Method and apparatus of measuring axial vibration of a disk... Method and apparatus of measuring axial vibration of a disk...

2005-06-28

2005-06-28

Edun, Muhammad (Department: 2655)

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With servo positioning of transducer assembly over track...

Optical servo system

C369S044250, C369S053180

Reexamination Certificate

active

06912184

ABSTRACT:
The present invention relates to method and apparatus of measuring axial vibration of a rotating disk. The present axial vibration measuring method selects a plurality of equally-spaced (45°˜120°-spaced) angular positions of a disk recording medium to conduct focusing operation at, conducts focusing operation at each selected position, measures focusing time from each start of the focusing operation to exactness in focus, and calculates axial vibration of the disk recording medium based on a deviation of the measured focusing times. The present method can measure exactly how much a rotating disk vibrates axially.

REFERENCES:
patent: 5936934 (1999-08-01), Kuribayashi et al.
patent: 6310852 (2001-10-01), Tomita et al.
patent: 6414921 (2002-07-01), Kim

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