Optical disc device with a wobble control circuit

Details Optical disc device with a wobble control circuit Optical disc device with a wobble control circuit

2005-10-04

2005-10-04

Young, W. R. (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044350, C369S053140

Reexamination Certificate

active

06952383

ABSTRACT:
An optical disc drive for accessing data stored on an optical disc is disclosed. The optical disc drive includes: a sled inside the optical disc drive, the sled sliding relative to the optical disc; an actuator on the sled, the actuator wobbling relative to the optical disc; and a control circuitry for controlling the optical disc drive. The control circuitry includes a focus compensation device for compensating focus errors caused by wobbles of the optical disc generated during rotations of the optical disc; and a high frequency compensator for compensating focus errors caused by wobbles of the optical disc generated during rotations of the optical disc at a frequency higher than a predetermined frequency. The focus compensation device controls the actuator to wobble upward and downward according to wobbles of the optical disc so as to substantially keep up wobbles of the actuator with the wobbles of the optical disc. When the optical disc is rotated at a frequency higher than the predetermined frequency, the high frequency compensator controls the actuator to wobble upward and downward so as to substantially keep up the wobbles of the actuator with the wobbles of the optical disc.

REFERENCES:
patent: 6442113 (2002-08-01), Lin
patent: 6459665 (2002-10-01), Chu
patent: 6657926 (2003-12-01), Burroughs
patent: 6816445 (2004-11-01), Leenknegt
patent: 6842414 (2005-01-01), Park

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