Servo control method and apparatus for an opto magnetic disc

Details Servo control method and apparatus for an opto magnetic disc Servo control method and apparatus for an opto magnetic disc

1995-11-27

1997-11-11

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4429, 369 4435, G11B 7095

Patent

active

056871473

ABSTRACT:
A servo control method and an apparatus for an opto-magnetic disc swiftly converts a servo control system corresponding to a changed area when a current servo area is abruptly changed while executing a servo control operation related to a specific area of the opto-magnetic disc by an optional servo system. A control section periodically detects that the current servo area is changed to a different are due to an external shock or excessive tracking operation while executing the servo control operation, and converts the current servo system into the servo system relevant to the changed area. Thus, the time required to resume the servo control operation is reduced when the servo area is abruptly changed during the servo operation by a servo control apparatus.

REFERENCES:
patent: 4243848 (1981-01-01), Utsumi
patent: 4982392 (1991-01-01), Soejima
patent: 5065386 (1991-11-01), Takeya et al.
patent: 5077718 (1991-12-01), Matsushita

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