Opto-magnetic signal reproducing apparatus for reading, by diffe

Details Opto-magnetic signal reproducing apparatus for reading, by diffe Opto-magnetic signal reproducing apparatus for reading, by diffe

1987-09-08

1990-08-28

Hecker, Stuart N.

Static information storage and retrieval

Information masking

Polarization

365128, 365124, 365121, 369 13, 369110, 360114, 350 382, G11B 1100, G11B 700

Patent

active

049531247

ABSTRACT:
An opto-magnetic signal reproducing apparatus includes a light source unit for applying a linearly polarized light beam to a recording medium having magnetically recorded information, a splitter for splitting the light beam modulated, responding to the recorded information by a magneto-optic effect, into two light beams having different polarization directions from each other, and a reproducing device for differentially detecting the split light beams to reproduce the recorded information. The splitter imparts a phase different equal to an integer multiple of .pi. to each of the split light beams.

REFERENCES:
patent: 4558440 (1985-12-01), Tomita
patent: 4561032 (1985-12-01), Matsumoto et al.
patent: 4569035 (1986-02-01), Tomita
patent: 4573149 (1986-02-01), Deguchi et al.
patent: 4599714 (1986-07-01), Endo
patent: 4672593 (1987-06-01), Ojima et al.
patent: 4682311 (1987-07-01), Matsubayashi et al.
patent: 4691308 (1987-09-01), Takagi et al.
patent: 4725725 (1988-02-01), Ando 369110

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