Eccentricity compensator for optical disk player and compensatin

Details Eccentricity compensator for optical disk player and compensatin Eccentricity compensator for optical disk player and compensatin

1994-04-28

1995-12-26

Epps, Georgia Y.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 48, 369 50, 369 58, 369 4432, G11B 700

Patent

active

054793890

ABSTRACT:
An eccentricity compensator for an optical disk player includes an amplifier for amplifying detected phase difference signals and outputting the amplified phase difference signal to a driving circuit, a system controller for recognizing whether a currently played disk surface is the top or bottom thereof and then comparing the error of the velocity controlling amount of a spindle motor with a reference tolerance, so as to output a control signal according to the comparison result, and a gain controller for, in the case of top-surface playback in which the velocity controlling amount is greater than the reference tolerance, controlling the gain of the amplifier in response to the control signal of the system controller, so as to vary the velocity of the spindle motor, and so as to reproduce normally a double-sided disk whose top and bottom surfaces have different eccentricities.

REFERENCES:
patent: 4700337 (1987-10-01), Inagawa et al.
patent: 4764860 (1988-08-01), Takao
patent: 5023857 (1991-06-01), Verboom
patent: 5086421 (1992-02-01), Tateishi
patent: 5121374 (1992-06-01), Barton et al.

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