Optical pickup device

Details Optical pickup device Optical pickup device

1992-07-10

1994-06-21

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, G11B 7125

Patent

active

053233735

ABSTRACT:
An optical pickup device includes an optical isolator provided in a beam path of an optical system for modulating the laser beam radiated from an end face of a semiconductor laser device and returning it to an end face of the semiconductor laser device, and a detector for detecting changes in an output of the return beam from the other face of the semiconductor laser device. The optical isolator transmits a beam component having the same plane of polarization as that of the laser beam. The magneto-optical recording medium may be reproduced by an optical system without employing a differential optical system.

REFERENCES:
patent: 4449204 (1984-06-01), Shimada et al.
patent: 5067122 (1991-11-01), McGee
patent: 5152597 (1992-10-01), Barnard
patent: 5182735 (1993-01-01), Kurtz et al.
patent: 5208799 (1993-05-01), Nakao et al.
Patent Abstracts of Japan, vol. 13, No. 557 (P-974), Dec. 12, 1989 & JP-A-01 232 544 (Sony Corp.), Sep. 18, 1989.
Patent Abstracts of Japan, vol. 5, No. 91 (E-061), Jun. 13, 1981 & JP-A-56 036 185 (Mitsubishi Electric Corp.), Apr. 9, 1981.

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