Driving apparatus of an optical recording medium

Details Driving apparatus of an optical recording medium Driving apparatus of an optical recording medium

1998-10-15

2000-11-28

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4435, 2502015, G11B 709

Patent

active

061544256

ABSTRACT:
A low-speed focus servo operation in which an objective lens is moved slowly is performed in a start process that is executed after mounting of an optical recording medium. On the other hand, a high-speed focus search operation in which the objective lens is moved fast is started when focusing is lost in a state that a focus servo operation is being performed. In the high-speed focus search operation, the focus servo characteristic is set to a modified version of a characteristic that is determined by a calibration operation that is performed in the start process.

REFERENCES:
patent: 5073881 (1991-12-01), Akiyama
patent: 5287339 (1994-02-01), Watanabe
patent: 5363357 (1994-11-01), Niwayama

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