Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-03-22
1991-10-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250213A, 2502084, 307311, H01J 4014
Patent
active
050556681
ABSTRACT:
The photo-sensor cell comprises two optical flip-flop sensors having two different light intensity thresholds, respectively , under imbalanced load offset conditions, two logic cells for latching only two different binary level signals from the two optical sensor respectively, without latching two of the same binary level signals from the two optical sensors due to a high or low pulsed power supply, and an output logic cell for generating an output binary signal from the time when light intensity rises beyond a higher threshold to the time when it drops below a lower threshold. Since all the elements are standardized in an IC manufacturing process and further no synchronizing clock signals are required between cells and signal processing logic owing to latch operations when a number of cells are connected in series or parallel, it is possible to realize a compact digital photo-sensor cell assembly with hysteresis activated by a pulsed power supply.
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Kazuhira Kakao et al., "Optoelectric Device with Optical-IC," Sharp Technical Report, No. 26, Jun. 1982, pp. 127-130.
Messinger Michael
Nelms David C.
Nissan Motor Co,. Ltd.
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