Optical information recording/reproducing apparatus capable of d

Details Optical information recording/reproducing apparatus capable of d Optical information recording/reproducing apparatus capable of d

1997-01-27

1998-06-23

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4426, G11B 700

Patent

active

057712140

ABSTRACT:
In an optical information recording/reproducing apparatus capable of executing a first recording method for recording information on either one of a land portion and a groove portion of a recording medium and a second recording method for recording information on both of the land portion and the groove portion, the recording medium is irradiated with a light beam, and a tracking error signal and/or focusing error signal is generated from the reflected light upon irradiation of the light beam. The level of the error signal is compared with a reference level to detect a tracking error state and/or focusing error state. The reference level is adapted to be switched according to the first or second recording method.

REFERENCES:
patent: 4786794 (1988-11-01), Dai
patent: 5184337 (1993-02-01), Rokutan
patent: 5185730 (1993-02-01), Komaki et al.
patent: 5199022 (1993-03-01), Suzuki et al.
patent: 5357496 (1994-10-01), Ikeda et al.
patent: 5568461 (1996-10-01), Nishiuchi et al.

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