Apparatus for the point-by-point scanning of an object

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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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.

REFERENCES:
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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.
"Microwaves, Acoustics & Scanning Microscopy" by C. F. Quate, pp. 23-55.
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"Theory & Application of Digital Signal Processing", by Pobiner et al., Prentice Hall, Inc. .COPYRGT.1975, pp. 40-46.
"Position Sensing in Video Disk Readout", by Braat et al., pp. 2013-2021, Jul. 1978, vol. 17, No. 13, Applied Optics.

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