Passive infrared sensor and obstacle detection system used in the same
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United States of America Patent
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Aug 21, 2007
Grant Date -
Sep 15, 2005
app pub date -
Feb 24, 2005
filing date -
Feb 27, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to one embodiment of a passive infrared sensor, a passive infrared sensor 1 where an infrared sensing element 5 and an optical system 4 that sets a detection area A1 of the infrared sensing element 5 are covered with a cover 2. The passive infrared sensor 1 includes: a light emitting element 6 that emits infrared light from the inside of the cover 2 to the outside through the optical system 4; a reflective region 2b that is disposed outside the cover 2 and reflects at least some of the infrared light emitted from the light emitting element 6; and a light receiving element 7 that receives the infrared light reflected by the reflective region 2b, transmitted through the optical system 4 and reaching the inside of the cover 2.
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