Passive type crime-preventing infrared sensor provided with a mechanism of monitoring an obstruction for the visual field
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United States of America Patent
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-
Jan 1, 1991
Grant Date -
N/A
app pub date -
Jun 23, 1988
filing date -
Oct 31, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The disclosure relates to a crime-preventing infrared sensor of a passive type in which the infrared detecting element 6 detects the energy of infrared rays radiated from an object in a predetermined visual field to be monitored and an alarm is given in response to a detection signal outputted from the infrared detecting element. The crime-preventing infrared sensor comprises an infrared detector 7 for detecting a human body or any other object approaching the sensor itself independently of an object-detecting function in a visual field, whereby the obstruction in the visual field of the object-detecting function is prevented.
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