High-intensity opto-electronic sensor having low power consumpti

Details High-intensity opto-electronic sensor having low power consumpti High-intensity opto-electronic sensor having low power consumpti

1980-11-17

1986-05-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214R, G01D 2104

Patent

active

045917086

ABSTRACT:
An opto-electronic end-of-tape sensor has a pulsed light source for producing high intensity, short duration light pulses and a photodetector controlling a clock driven digital counter. In a normal condition with tape blocking the light pulses, the counter is kept in a reset state. If a clear light path of sufficient time duration is detected the photodetector output enables the counter to reach a predetermined count to obtain an end-of-tape signal output. The sensor circuit discriminates against pinholes in the tape by requiring detection of an uninterrupted predetermined number of light pulses to generate the end-of-tape signal.

REFERENCES:
patent: 4063085 (1977-12-01), Montanvert

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