Photoelectric switch with heating responsive to temperature and light
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United States of America Patent
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Aug 28, 1990
Grant Date -
N/A
app pub date -
Aug 17, 1989
filing date -
May 6, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The photoelectric switch includes a heating unit formed on a light transmitting plate around a beam transmission part of the body of a light receiving part. A received light quantity decision circuit compares an electrical signal corresponding to a quantity of light received with a set level to decide whether or not it is below the set level. A temperature circuit generates an electrical signal corresponding to an ambient temperature in the vicinity of the body. A driving circuit for energizing the heating unit requires that the temperature circuit below a set temperature and that the quantity of received light is also below the set level. If either condition fails, the heating unit remains deenergized.
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