Static information storage and retrieval – Information masking – Polarization
Patent
1992-08-28
1993-12-14
LaRoche, Eugene R.
Static information storage and retrieval
Information masking
Polarization
365215, 360114, 369 13, 428694, 428900, G11C 1306
Patent
active
052709663
ABSTRACT:
A rewritable magneto-optical memory device for multi-wavelength recording and reproduction having a high packing density. The device is form by a plurality of magnetic film layers, each of which has a unique characteristic wavelength at which optical absorption and magneto-optical effect occur simultaneously, in which a selective writing on one of the plurality of magnetic film layers is realized by using a writing light beam incident on the plurality of magnetic film layers which has a wavelength equal to the characteristic wavelength of that one of the plurality of magnetic film layers, and a selective reading from that one of the plurality of magnetic film layers is realized by measuring Faraday rotation angle of a reading light beam incident on the plurality of magnetic film layers which has a wavelength equal to the characteristic wavelength of that one of the plurality of magnetic film layers.
REFERENCES:
patent: 4645722 (1987-02-01), Katayara et al.
patent: 4664977 (1987-05-01), Osato et al.
patent: 4922454 (1990-05-01), Taki
patent: 5058099 (1991-10-01), Murakami et al.
patent: 5143798 (1992-09-01), Fujii
LaRoche Eugene R.
Nippon Hoso Kyokai
Yoo Do Hyum
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