High-intensity opto-electronic sensor having low power consumption
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United States of America Patent
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May 27, 1986
Grant Date -
N/A
app pub date -
Nov 17, 1980
filing date -
Nov 17, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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