Apparatus for reading information

Details Apparatus for reading information Apparatus for reading information

1983-05-06

1985-11-12

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

045532290

ABSTRACT:
An apparatus for reading information from an optical recording medium includes a laser beam source, a beam splitter, and a fixed mirror which is disposed in an optical path of a laser beam for reflecting the laser beam from the laser beam source to the beam splitter. The laser beam source is arranged so that a linearly polarized, light oscillating plane, which includes an optical axis as well as an oscillating direction of the laser beam, is perpendicular to a plane which includes a normal of the fixed mirror and the optical axis of the laser beam. In addition, the beam splitter is arranged so that a plane which includes a normal of a reflection plane of the beam splitter and the optical axis of the laser beam is parallel to the linearly polarized, light oscillating plane. According to this construction, attenuation of the laser beam is reduced.

REFERENCES:
patent: 4100577 (1978-07-01), Naruse et al.
patent: 4139263 (1979-02-01), Lehureau et al.
patent: 4312570 (1982-01-01), Southwell
patent: 4322130 (1982-03-01), Ito et al.

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