Smoke detector
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United States of America Patent
Stats
-
Jun 3, 1980
Issued Date -
N/A
app pub date -
Jan 12, 1978
filing date -
Jun 23, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A photo-electric smoke detector operating on the reflected light principle which has a rate detector for detecting the rate of increase of smoke concentration. When the rate exceeds a predetermined value, the rate detector causes the intensity of the smoke detector light source to increase, thereby increasing the sensitivity of the detector. In one embodiment of the invention, after the intensity of the light has been increased by the rate detector, it is maintained at the higher intensity for a predetermined time, even if the rate of increase of smoke concentration falls below the predetermined value.
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Family
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