Disc device providing eccentricity compensation using a head rad

Details Disc device providing eccentricity compensation using a head rad Disc device providing eccentricity compensation using a head rad

1997-03-21

1998-06-02

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

360 51, 360 7704, G11B 700

Patent

active

057611653

ABSTRACT:
A magnetic or optical disc device that can correctly follow the eccentricity of an eccentrically chucked disc operates with a disc having data tracks provided with uniformly spaced clock marks for providing a timing standard and includes a reproduction head mounted on a turnable arm arranged for movement relative to the disc and a head traveling radial position detector attached to the arm that detects the rotational angle and produces a head position signal. A home index signal is detected and used along with the radial position signal and a derived clock signal to measure eccentricity magnitude that is stored in a memory and subsequently accessed for use in generating a control signal for a phase lock loop that provides an eccentricity adjusted clock signal.

REFERENCES:
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patent: 5095475 (1992-03-01), Ishikawa
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Patent Abstracts of Japan, vol. 15, No. 156 (P-1192) & JP 3-25,767, Apr. 18, 1991.
Patent Abstracts of Japan, vol. 9, No. 323 (P-414) & JP 60-147,975, Dec. 18, 1985.
Patent Abstracts of Japan, vol. 13, No. 342 (P-908) & JP 1-100777, Aug. 2, 1989.
Patent Abstracts of Japan, vol. 12, No. 359 (P-762) & JP 63-108575, Sep. 27, 1988.

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