Control device for head unit having optical head and multiple ma

Details Control device for head unit having optical head and multiple ma Control device for head unit having optical head and multiple ma

1995-10-06

1997-01-07

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, G11B 7095

Patent

active

055924476

ABSTRACT:
A head unit control device comprising an optical head unit for radiating a laser beam onto a magneto-optical disc, a magnetic head unit including a floating magnetic head and a fixed magnetic head. Luminous flux is radiated onto the magnetic head unit and the optical head unit. The luminous flux reflected by these units is sensed by photo detectors, so that a relative position error signal is generated by a sensing circuit. When information is overwritten onto the magneto-optical disc on which information has been already recorded, the floating magnetic head is moved in synchronization with the optical head, based on the relative position error signal. When information is recorded on the magneto-optical disc on which information has not been recorded, the fixed magnetic head is moved in synchronization with the optical head, based on the relative position error signal.

REFERENCES:
patent: 4962494 (1990-10-01), Kimura
patent: 5078471 (1992-01-01), Takishima
patent: 5191562 (1993-03-01), Hensing et al.
patent: 5191570 (1993-03-01), Shirai
patent: 5297114 (1994-03-01), Itoh et al.
patent: 5309423 (1994-05-01), Noguchi et al.
patent: 5321550 (1994-06-01), Maruyama et al.
patent: 5406532 (1995-04-01), Nishikawa
patent: 5408455 (1995-04-01), Takishima
Patent Abstracts of Japan, vol. 18, No. 587, (P1824), Nov. 10, 1994 & JP 6-215434.
Patent Abstracts of Japan, vol. 16, No. 502, (P1438), Oct. 16, 1992 & JP 4-181535.

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