Tracking control apparatus for optical disk

Details Tracking control apparatus for optical disk Tracking control apparatus for optical disk

1994-05-03

1997-05-20

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4432, G11B 7085

Patent

active

056318863

ABSTRACT:
Disclosed is a tracking control apparatus for an optical disk. The optical head of the optical disk system generates a tracking error signal for servo tracking. The tracking error signal is also employed to judge whether the light spot is present in the tracking enable region of the disk. If the light spot is judged out of the tracking enable region, the optical head is moved inwardly or outwardly in the radial direction of the disk until the light spot is present in the tracking enable region to activate tracking servo.

REFERENCES:
patent: 5123002 (1992-06-01), Tateishi
patent: 5182736 (1993-01-01), Yanagi
patent: 5218588 (1993-06-01), Suzuki
patent: 5222057 (1993-06-01), Suzuki et al.
patent: 5307333 (1994-04-01), Ikeda et al.
K. Bulthuis, et al., "Ten billion bits on a disk", IEEE spectrum, pp. 26-33, Aug. 1979.
K. Torazawa, et al., "Erasable digital audio disk system", Applied Optics, vol. 25, No. 22, pp. 3990-3995, Nov. 15, 1986.

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