Optical information-reproducing apparatus using separately locat

Details Optical information-reproducing apparatus using separately locat Optical information-reproducing apparatus using separately locat

1992-06-02

1994-08-09

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369 4412, 369 4414, 369112, G11B 712

Patent

active

053372999

ABSTRACT:
A light beam emitted from a light source is split into three light beams by diffracting the light beam by using a diffraction grating. The three light beams are reflected by the first side of a plane-parallel plate. The reflected light beams are projected onto an optical disk. The three signal light beams are reflected on the optical disk and returned to the plane-parallel plate in the form of three signal light beams. The plane-parallel plate allows part of the signal light beams to transmit therethrough and to reach a first photo detector. Further, the plane-parallel plate reflects the signal light beams on the second side and allows the reflected light beams to pass therethrough before reaching a second photo detector. The first photo detector receives the central light beam. The second photo detector receives the side light beams.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4753513 (1988-06-01), Shikama
patent: 4768183 (1988-08-01), Ohnishi et al.
patent: 4817072 (1989-03-01), Toide et al.
patent: 4817074 (1989-03-01), Yamanaka
patent: 5084851 (1992-01-01), Noda et al.
patent: 5095476 (1992-03-01), Greve et al.
patent: 5185731 (1993-02-01), Takahashi

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