Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-04-16
1993-02-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
G01V 904
Patent
active
051873613
ABSTRACT:
The object detection apparatus of the photoelectric reflection type is comprised of an optical source for generating an optical ray, an optical projection system having an optical axis extending through an observation zone along a limited observation range for directing the optical ray along the optical axis, and an optical collecting system for collecting the optical ray reflected by an object which traverses the observation zone within the observation range to focus the ray into an optical spot. Further a stationary photosensor is provided to receive said optical spot and operates to generate an electrical signal only when an object enters the observation zone within the observation range. The photosensor has an effective detection region dimensioned to determine the limits of the observation range. An output circuit is connected to the photosensor to output an object detection signal only when the photosensor detects the spot. To avoid spurious actuation of the apparatus caused by drift or slowly changing conditions in the background light, the optical source includes a photoemitter for intermittently emitting a pulsing optical ray in response to a sampling signal, and the output circuit operates to produce successively sampled data according to the intensity of the detected optical ray and to calculate a relative change between preceding and succeeding sampled data.
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Copal Company Limited
Messinger Michael
Nelms David C.
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