Optical information recording/reproducing apparatus based on tra

Details Optical information recording/reproducing apparatus based on tra Optical information recording/reproducing apparatus based on tra

1996-03-28

2000-12-26

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4442, 369 4424, G11B 709

Patent

active

061670065

ABSTRACT:
An optical information recording/reproducing apparatus for optically recording/reproducing information by irradiating a track on a recording medium with a light comprises: a detecting circuit, a tracking error signal producing circuit, and a tracking control circuit. The detecting circuit selectively detects a circular area having a diameter smaller than a diameter of a light beam reflected from the recording medium and obtains an output signal corresponding to the detected circular area. The tracking error signal producing circuit produces, from the output signal of the detecting circuit, a tracking error signal indicating a shift in a position of a light beam irradiated on the recording medium in a track width direction. The tracking control circuit controls an irradiation position of a light beam irradiated on the recording medium in the track width direction based on the tracking error signal.

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patent: 4525826 (1985-07-01), Nakamura et al.
patent: 4742218 (1988-05-01), Nakamura et al.
patent: 4945529 (1990-07-01), Ono et al.
patent: 5017768 (1991-05-01), Takagi
patent: 5150342 (1992-09-01), Nagahara et al.
patent: 5199022 (1993-03-01), Suzuki et al.

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