Optical disk apparatus having an improved tracking control syste

Details Optical disk apparatus having an improved tracking control syste Optical disk apparatus having an improved tracking control syste

1996-06-28

1999-05-18

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 4435, G11B7/09

Patent

active

059057033

ABSTRACT:
An optical disk apparatus for stable tracking and reproduction of information recorded on a high density disk, the apparatus cancels various noise components in the tracking error signal. Disturbances caused in the tracking error signal, such as crosstalk from adjacent tracks, the positional shift of the photo detectors due to a change of the ambient temperature, an inclination of the disk surface to a laser beam causing a defocus of the laser beam, and defects on a disk are eliminated. The optical disk apparatus has a light source, a diffraction grid, a semi-transparent prism, a collimator lens, an objective lens, a concave lens, a cylindrical lens, a photodetecting device, a reproduction control circuit, a tracking drive circuit, and an actuator for displacing the objective lens.

REFERENCES:
patent: 5033040 (1991-07-01), Fujita
patent: 5282192 (1994-01-01), Yamada et al.
patent: 5363358 (1994-11-01), Yanagawa

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