Optical card recording/reproducing apparatus

Details Optical card recording/reproducing apparatus Optical card recording/reproducing apparatus

1991-05-17

1992-10-20

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 369 4429, 235454, G11B 708

Patent

active

051576449

ABSTRACT:
An optical card recording/reproducing apparatus includes a holding member for holding a recording medium inserted to perform data recording/reproducing. An optical head includes a converging lens for converging a light beam for recording/reproducing on the recording medium. A position control section moves the holding member and optical head by a predetermined distance to conform the converging position of the converging lens to the position of the recording medium close to the holding member. A focus search circuit searches a focal point by changing the distance between the converging lens and recording medium at the position close to the holding member, and outputs an in-focus detection signal. A focus control section controls the distance between the converging lens and recording medium to maintain a focal relationship between the converging lens and recording medium in response to the in-focus detection signal output from the focus search circuit.

REFERENCES:
patent: 4910725 (1990-03-01), Drexler et al.
patent: 4918415 (1990-04-01), Hashimoto et al.
patent: 5003523 (1991-03-01), Wachi et al.
patent: 5038332 (1991-08-01), Sakagami et al.
patent: 5059774 (1991-10-01), Kubo et al.

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