Track servo control apparatus for optical disk

Details Track servo control apparatus for optical disk Track servo control apparatus for optical disk

1998-04-27

2000-12-19

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, G11B 7095

Patent

active

061635138

ABSTRACT:
In a track servo control apparatus for an optical disk, including an optical head for recording and reproducing information in a track of a rotating optical disk, a lens actuator is provided on the optical head for displacing a light spot in a direction traversing the track of the optical disk, and a positioner is associated with the optical head for displacing the optical head in a radial direction of the optical disk. The optical head generates a positional deviation signal indicative of a positional deviation between the light spot and the track, and in a track following control operation, the lens actuator is driven on the basis of a high frequency component of the positional deviation signal and the positioner is driven on the basis of a low frequency component of the positional deviation signal. A variable filter circuit receives the positional deviation signal to separate the positional deviation signal into the high frequency component and the low frequency component, and a frequency threshold of the variable filter circuit for separating the positional deviation signal into the high frequency component and the low frequency component can to be changed by an external signal.

REFERENCES:
patent: 5210732 (1993-05-01), Suenaga et al.
patent: 5247503 (1993-09-01), Nomiyama et al.
patent: 5768228 (1998-06-01), Bates et al.

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