Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1981-05-27
1983-08-16
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369122, G11B 700
Patent
active
043995292
ABSTRACT:
An optical device for recording and reading on a data carrier is provided with first optical means forming a composite source of radiant energy comprising a first semiconductor-laser source for producing a polarized reading beam, a second semiconductor-laser source for producing a polarized recording beam, the two directions of polarization being at right angles to each other, and an optical element for combining the two beams followed by a polarizer. The device is also provided with second optical means comprising an optical separating element, a quarter-wave plate and an optical system for focusing the two reading and recording components after reflection from the tracks of the disk on two distinct zones of an optoelectronic detection device.
REFERENCES:
patent: 3240548 (1966-03-01), Biessels
patent: 3969573 (1976-07-01), Bouwhuis
patent: 4023033 (1977-05-01), Bricot
patent: 4027330 (1977-05-01), Maslowski et al.
patent: 4079248 (1978-03-01), Lehureau
patent: 4203133 (1980-05-01), Bricot
patent: 4334300 (1982-06-01), Arquie
"Disk Storage Technology" by White, pp. 138-148, Sci. Am. Aug. 1980.
"Integral Autofocusing System & Method of Manufacture" by Goston-pp. 1906-1908 IBM Technical Disclosure Bulletin; vol. 23, No. 5, Oct. 1980.
Patents Abstracts of Japan, vol. 3, No. 98, Apr. 18, 1979, p. 97E131.
Le Merer Jean P.
Leterme Dominique
"Thomson-CSF"
Faber Alan
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