Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1973-10-18
1978-02-07
Lieberman, Eli
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
364515, G01D 536, G06F 1534, G06G 719
Patent
active
040728617
ABSTRACT:
A light-emitting target within the field of view of an optical objective is focused within a generally rectangular detection area upon a continuously moving code carrier which is subdivided into a multiplicity of juxtaposed strip zones parallel to the direction of motion, each strip zone forming a pseudo-random binary optical code pattern recurring one or more times throughout its length. The motion of the code carrier generates a pulsed light beam which is intercepted by a photoelectric transducer unit and, after electric amplification, is reconverted by a photoemissive unit into a train of luminous pulsations projected onto the code carrier in a correlation area traversed at every instant by a code pattern identical with that of the detection area. The light gated by the matching code of the correlation area is focused upon the screeen of a camera tube which therefore receives a bright spot at a point whose location on the screen corresponds to that of the target image on the detection area. The transducer unit may comprise a set of linear detectors, aligned with respective strip zones, in which case the photoemissive unit has a like number of linear light emitters parallel to the direction of carrier motion. With a single detector receiving light from the entire detection area, feeding a single light emitter, the code patterns of the several strip zones are mutually distinct.
REFERENCES:
patent: 2942118 (1960-06-01), Gedance
patent: 3239674 (1966-03-01), Aroyan
patent: 3355579 (1967-11-01), Robertson
patent: 3441724 (1969-04-01), Taylor, Jr.
patent: 3483557 (1969-12-01), Skenderoff et al.
patent: 3526893 (1970-09-01), Skenderoff et al.
patent: 3617724 (1971-11-01), McCarthy
Couderc Georges
Dansac Jean
Payen Claude A.
Symaniec Leonidas
"Thomson-CSF"
Grigsby T. N.
Lieberman Eli
Ross Karl F.
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