Optical light beam scanner with zero order beam reflector

Details Optical light beam scanner with zero order beam reflector Optical light beam scanner with zero order beam reflector

1988-08-16

1991-09-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369100, G11B 7135

Patent

active

050460617

ABSTRACT:
An optical recording and/or reproducing apparatus employs an optical tape, an optical disc or the like as a record medium. The apparatus comprises an acousto-optic deflector which receives a light beam and generates a zero order beam which passes straight through the deflector and a first order beam which is deflected by the deflector. The zero and first order beams are separated from each other by a polarized beam splitter. The first order beam is projected via a 1/4 wavelength plate onto an optical record medium, while the zero order beam, which does not contribute to recording or reproduction of information signals, is shunted aside so that it does not reach the optical record medium. The reflected light beam from the optical record medium is extracted by the same polarized beam splitter and used for reproduction of the information signals.

REFERENCES:
patent: 4627725 (1986-12-01), Nishio et al.
patent: 4703408 (1987-10-01), Yonezawa et al.
patent: 4742506 (1988-05-01), Fukumoto et al.
patent: 4766585 (1988-08-01), Fukumoto et al.
patent: 4853919 (1989-08-01), Miyawaki et al.
patent: 4868820 (1989-09-01), Nagashima et al.
Patents Abstracts of Japan, vol. 12, No. 366, p. 765, 9/30/88, and JP63-117324.

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