Static information storage and retrieval – Information masking – Polarization
Patent
1986-01-09
1991-04-09
Moffitt, James W.
Static information storage and retrieval
Information masking
Polarization
G11C 1306
Patent
active
050070215
ABSTRACT:
An apparatus for reading out information written on a magneto-optical data storage medium through magnetization thereof in one of opposite directions normal to a surface of the medium, comprising a device for emitting circularly or linearly polarized light to the storage medium in a direction parallel to the direction of magnetization of the storage medium, and a device for readng out the information based on a change in total quantity of the polarized light which is reflected from the storage medium or transmitted through the medium. The apparatus may comprise at least one polarizing beam splitter and a quarter-wave retardation plate. The device for reading out the information may comprise at least one data-reading optical detector which generates a signal corresponding to the detected total quantity of the light reflected from the storage medium. The apparatus may further comprise a monitoring device for maintaining a constant output of a light source for emitting the light, or eliminating noises caused by a variation in output of the light source.
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patent: 4027330 (1977-05-01), Maslowski et al.
patent: 4399529 (1983-08-01), Leterme et al.
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4414650 (1983-11-01), Ohta et al.
patent: 4424580 (1984-01-01), Becker et al.
"8032 Electronics International", vol. 55, (1982) July, No. 15, New York, USA.
"Journal of Electronic Engineering", vol. 18, Feb. 1981, No. 170, Tokyo, Japan.
Brother Kogyo Kabushiki Kaisha
Moffitt James W.
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