Scanning apparatus with integrated beam separating and beam-spli

Details Scanning apparatus with integrated beam separating and beam-spli Scanning apparatus with integrated beam separating and beam-spli

1991-02-13

1992-03-10

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

050954768

ABSTRACT:
Scanning apparatus for a magneto-optical record carrier includes an integrated beam separating and beam splitting element consisting of a supporting body (30) on the surfaces of which are a semi-transparent mirror (22) and a polarization-sensitive beam-splitting layer (26). The semi-transparent mirror separates the scanning beam from the beam reflected from the record carrier. The beam-splitting layer splits the reflected beam into orthogonally polarized sub-beams (27 and 28) which are incident on respective photodiodes or on different regions of a single multiple photodiode. The supporting body may be of a birefringent material which provides orthogonally polarized beam-splitting, in which case the beam splitting layer may be omitted.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4544269 (1985-10-01), Nose et al.
patent: 4753513 (1988-06-01), Skikama
patent: 4771411 (1988-09-01), Greve
patent: 4866694 (1989-09-01), Korth
patent: 4894815 (1990-01-01), Tamanaka

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