Controlling positioning of recording/reproducing head by combini

Details Controlling positioning of recording/reproducing head by combini Controlling positioning of recording/reproducing head by combini

1992-07-20

1994-02-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44340, 369 54, G11B 7085

Patent

active

052854353

ABSTRACT:
It is intended that the relative head speed for a track in seeking is detected precisely without being influenced by track swing due to eccentricity of a disk. To this end, the current (proportional to the acceleration of an optical head) for a voice coil motor for driving an optical head is previously detected while track following control is executed and the detected data are stored in memory. In seeking, the sum of a detected current (representative of the acceleration of the head for a fixed component) and the data supplied from the memory is integrated to provide the relative speed of the head for a track. The relative speed signal is added to the differential signal of a pulsated signal of the track traversing signal of the head. The addition output represents the precise relative speed signal in consideration of track swing. If the voice coil motor is controlled so that this relative speed coincides with a target speed signal, the head speed can be controlled without being influenced by the track swing.

REFERENCES:
patent: 4839876 (1989-06-01), Fennema
patent: 5090001 (1992-02-01), Ito et al.
patent: 5117410 (1992-05-01), Akiyama
patent: 5161140 (1992-11-01), Terada
patent: 5197058 (1993-03-01), Bell, Jr. et al.

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