Optical disc apparatus and method of tracking control of optical

Details Optical disc apparatus and method of tracking control of optical Optical disc apparatus and method of tracking control of optical

1997-06-10

1999-07-06

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 709

Patent

active

059205288

ABSTRACT:
An optical disc apparatus for recording and/or reproducing with respect to an optical disc, comprises a light source for emitting a laser beam; an object lens for focusing the laser beam toward the optical disc; a supporting device which supports the object lens; a sled portion which holds this supporting device; a transporting means for moving the sled portion in the radial direction of the optical disc; a center point servo control means for detecting the movement of the object lens and moving the supporting device so that the object lens is maintained at a predetermined position; a tracking servo control means for generating a tracking error signal and moving the supporting device, so that the object lens is held on the desired track of the optical disc; a frequency detecting means for detecting the frequency of the tracking error signal; and a servo control selecting means for selectively selecting the center point servo control means or the tracking servo control means based on the frequency.

REFERENCES:
patent: 5210732 (1993-05-01), Suenaga
patent: 5285431 (1994-02-01), Ogawa
patent: 5285432 (1994-02-01), Nakane
patent: 5446713 (1995-08-01), Tateishi
patent: 5577009 (1996-11-01), Takamine
patent: 5671200 (1997-09-01), Yamaguchi

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