Information reproducing apparatus based on opto-magnetic effect

Details Information reproducing apparatus based on opto-magnetic effect Information reproducing apparatus based on opto-magnetic effect

1982-02-26

1984-05-29

McElheny, Jr., Donald E.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

369 46, 369110, 369112, G11B 532, G11B 700

Patent

active

044518633

ABSTRACT:
An information reproducing apparatus for reproducing information recorded on a record medium based on an opto-magnetic effect is disclosed. A laser light source, a first polarizing beam splitter, a first Faraday element, a second polarizing beam splitter, an optical member having a second Faraday element or a rotatory polarizer, and first and second photodetectors, which elements are positioned along an optical axis in the described order. The angle between the polarizing axis of the first beam splitter and the polarizing axis of the second beam splitter is made .pi./4 and Faraday elements rotate the polarizing direction of the light beam therethrough. The first photodetector receives the laser beam reflected by the record medium and the second beam splitter and the second photodetector receives the laser beam reflected by the record medium, transmitted through the second beam splitter and reflected by the first beam splitter.

REFERENCES:
patent: 3396266 (1968-08-01), Max et al.
patent: 3739362 (1973-06-01), Eschelbach
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3919698 (1975-11-01), Bricot et al.
patent: 4125860 (1978-11-01), Ishii et al.

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