Light emission portion, photoelectric smoke sensor, and suction-type smoke sensing system
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United States of America Patent
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Jun 3, 2014
Grant Date -
Mar 6, 2014
app pub date -
Aug 31, 2012
filing date -
Aug 31, 2012
priority date (Note) -
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Abstract
The present invention can detect smoke with high accuracy. A light emitting portion is provided with a light emitting element outputting the inspection light with high brightness, the distribution of which is adjusted. A reflection portion collects the inspection light from the light emitting element to the detection region. A diaphragm portion transmits the collected light toward the detection region, while removing light diffused to regions other than the detection region a light shielding portion shields the light diffused to the regions other than the detection region. The light emitting element is provided with a light source outputting the inspection light with high brightness and a parabolic reflective mirror whose curved surface reflects light from the light source toward the detection region, the reflected light being in a doughnut shape in which the center is relatively dark and the periphery is bright.
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