Optical information recording-reproducing apparatus including a

Details Optical information recording-reproducing apparatus including a Optical information recording-reproducing apparatus including a

1993-03-09

1994-01-04

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369118, 369112, 359819, G11B 700

Patent

active

052766632

ABSTRACT:
An optical information recording-reproducing apparatus includes a light source unit producing a light beam applied to an optical information recording medium, a first optical device disposed in an optical path leading from the light source unit to the optical information recording medium for directing the light beam from the light source unit to the optical information recording medium and separating the light beam passed through the optical information recording medium from the light beam from the light source unit, a second optical device for condensing the light beam passed through the optical information recording medium and separated by the first optical device, the second optical device including a first condensing lens, a holding member for holding the first condensing lens, and a second condensing lens mounted on the holding member, a first light receiving member for receiving the light beam condensed by the second optical device to obtain the focus control signal and/or a tracking control signal of the light beam directed to the optical information recording medium through the first optical device, and a second light receiving member for receiving the light beam condensed by the second optical device to obtain a reproduced signal of information recorded on the optical information recording medium.

REFERENCES:
patent: 4406520 (1983-09-01), Sato
patent: 4672594 (1987-06-01), Kato et al.
patent: 4725721 (1988-02-01), Nakamuza et al.
patent: 4785438 (1988-11-01), Mizunoe
patent: 5001695 (1991-03-01), Tominaga
patent: 5049428 (1991-09-01), Kanno et al.

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