Optical playback head

Details Optical playback head Optical playback head

1989-04-20

1991-11-12

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 32, 369 4423, 369 4414, G11B 1100, G11B 700

Patent

active

050653903

ABSTRACT:
A magneto-optical playback head which comprises a first optical waveguide facing to a light source at one end thereof and facing to a magneto-optical recording medium at other end thereof for guiding an incident light beam to the magneto-optical recording medium, a second optical waveguide for guiding a light beam reflected from the magneto-optical recording medium to a photodetector provided at one end thereof, a polarizer provided for the first optical waveguide, and an analyzer provided for the second optical waveguide, the polarizer and the analyzer being formed by providing first and second conductive layers on the first and second optical waveguides, with first and second insulating buffer layers interposed therebetween, respectively.

REFERENCES:
patent: 4220395 (1980-09-01), Wang et al.
patent: 4737946 (1988-08-01), Yamashita et al.
patent: 4855986 (1989-08-01), Taki
patent: 4859033 (1989-08-01), Kono et al.
patent: 4861128 (1989-08-01), Ishikawa et al.
patent: 4945525 (1990-07-01), Yamamoto et al.
Patent Abstracts of Japan, vol. 8, No. 211 (P-303)(1648) 26 Sep. 1984, and JP-A-59 94257 (Olympus Kogaku K.K.) 30 May 1984.
Patent Abstracts of Japan, vol. 9, No. 190 (P-378) (1913) 7 Aug. 1985, and JP-A-60 59548 (Nippon Denshin Denwa Kosha) 5 Apr. 1985.
Patent Abstracts of Japan, vol. 9, No. 190 (P-378) (1913) 7 Aug. 1985, and JP-A-60 59547 (Nippon Denshin Denwa Kosha) 5 Apr. 1985.
Patent Abstracts of Japan, vol. 10, No. 232 (P-486) (2288) 12 Aug. 1986, and JP-A-61 66238 (Nippon Telegr. & Teleph. Corp.) 5 Apr. 1986.

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