Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-07-15
1990-01-09
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369122, G11B 700
Patent
active
048932965
ABSTRACT:
An optical pickup device having a semiconductor laser element mounted on a substrate, a photo detector formed on the substrate to receive a laser beam emitted from the semiconductor laser element and an optical element mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam, the optical element having its face opposing the semiconductor laser element formed as an inclined face on which a semitransparent reflection film is deposited. The optical path branching optical element is provided with preventing means by which, of laser beams incident on the optical element, a laser beam reflected and/or scattered within the optical element is prevented from irradiating the photo detector.
REFERENCES:
patent: 4716559 (1987-12-01), Hine
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4823331 (1989-04-01), Yoshitoshi et al.
Kume Hidehiro
Matsumoto Yoshiyuki
Mitsumori Koji
Oinoue Hiroshi
Yamamoto Etsufumi
McElheny Jr. Donald
Shaw, Jr. Philip M.
Sony Corporation
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