Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-07-06
1991-04-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 250226, G01V 904, G01J 350
Patent
active
050085298
ABSTRACT:
The projection lights including the red and infrared lights are projected from a light projecting device (3) onto a reflex reflector (7) arranged at a position which is away from the light projecting device by a predetermined distance. The reflex reflector reflects the red light and absorbs the infrared light. The reflected lights from the reflex reflector or an object to be detected are detected by a photo sensitive device (4). The photo sensitive device individually detects the red light and infrared light and outputs two light detection signals. The sum of the light detection signals is compared with the first threshold value. The difference between the light detection signals is compared with the second threshold value. An object detection signal is formed on the basis of the logical arithmetic operation of the results of the comparison.
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Messinger Michael
Nelms David C.
Omron Tateisi Electronics Co.
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