Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1981-10-21
1984-05-01
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369101, 369124, G11B 1100
Patent
active
044465483
ABSTRACT:
An apparatus is described for point-by-point scanning of an object, which may be a phase object, an amplitude object or a combined amplitude and phase object. The object is scanned with a light, sound, electron or X-ray beam which is converged to a spot on the object. A pair of detectors disposed in the path of the modulated radiation coming from the object convert the variations in the radiation into corresponding electrical signals which are fed to a summing circuit. A variable phase shifter connected between at least one of the detectors and the summing circuit is used to introduce a phase shift in the electrical signal such as to optimize the output signal of the summing circuit for the type of object being scanned.
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patent: 4025784 (1977-05-01), Lehureau
patent: 4171879 (1979-10-01), Bricot
patent: 4349901 (1982-09-01), Howe
patent: 4366564 (1982-12-01), Haon
"System Coding Parameters Mechanics & Electromechanics of the Reflective Videodisc Player" SMPTE Journal, Feb. 1977, vol. 86, pp. 74-79, by Bogels.
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Philips Technical Review, vol. 37, 1977, No. 1, pp. 1-9, by Dekkers.
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Bouwhuis Gijsbertus
Braat Josephus J. M.
Briody Thomas A.
Faber Alan
Mayer Robert T.
Tamoshunas Algy
U.S. Philips Corporation
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