Focusing servo controlling apparatus

Details Focusing servo controlling apparatus Focusing servo controlling apparatus

1996-01-29

1997-05-13

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4434, 369 4426, G11B 7095

Patent

active

056299125

ABSTRACT:
A magneto-optical disc recording or reproducing device focusing control servo system which uses a digital signal processor (DSP) to control a pulse width modulation (PWM) circuit so that if the focusing servo is to be in operation alone, such as during a focusing search or seek, fixed clocks of a fixed frequency are used for processing focusing servo signals and after engagement of the focusing servo, focusing servo is effected responsive to focusing servo signals which are formed based upon a reproduced servo pattern of the magneto-optical disc.

REFERENCES:
patent: 4512003 (1985-04-01), Kimura et al.
patent: 4907212 (1990-03-01), Pharris et al.
patent: 5103439 (1992-04-01), Bierhoff et al.
patent: 5146442 (1992-09-01), Shikichi
patent: 5379282 (1995-01-01), Wachi
patent: 5475664 (1995-12-01), Shimizume et al.

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