Static information storage and retrieval – Read/write circuit – Optical
Patent
1978-12-22
1980-12-23
Hecker, Stuart N.
Static information storage and retrieval
Read/write circuit
Optical
3581285, G11C 1308
Patent
active
042414237
ABSTRACT:
In an optical memory device, such as an optical video disk, an injection laser is used as the source of the light, as the detector of the light reflected from the memory element and as the detector for controlling the proper focus of the light on the memory element. The light reflected from the memory element is fed back into the injection laser and variations in certain characteristics of the injection laser, such as the optical output at constant current, the electrical current through the laser at constant voltage and the voltage drop across the laser at constant current, are used to read the memory device and to maintain the focus.
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patent: 3992575 (1976-11-01), Velzel et al.
patent: 4005259 (1977-01-01), Kaneko
patent: 4032776 (1977-06-01), Rosmalen
patent: 4074312 (1978-02-01), Rosmalen
patent: 4190775 (1980-02-01), Sakurai et al.
Mitsuhashi et al., Self-Coupled Optical Pickup, Optics Communications, vol. 17, No. 1, pp. 95-97, 4/76.
Bartolini et al., "Optical Disk Systems Emerge," IEEE Spectrum, 8/78, pp. 20-28.
Burke William J.
Ettenberg Michael
Kressel Henry
Christoffersen H.
Cohen D. S.
Hecker Stuart N.
RCA Corporation
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