G - Physics
08
B
340/155, 340/140
G08B 17/10 (2006.01)
Patent
CA 1085019
ABSTRACT OF THE DISCLOSURE A smoke detector operating on the reflected light principle, utilizing a pulsing light source and means requiring several consecutive pulses of light reflected from smoke to actuate an alarm. During normal standby operation, the light pulses at a predetermined slow rate. In one embodiment of the invention, when smoke is present, the first pulse of light reflected from the smoke causes the time interval to the next pulse to decrease, so that if smoke continues to be present, the number of reflected pulses required to actuate the alarm are received in a shorter time. In another embodiment of the invention, the first pulse of light reflected from smoke causes the pulse rate to increase for a predetermined number of pulses or for a predetermined time. In either embodiment, the time to alarm is thereby shortened without increasing the current drain of the device and without shortening the life of the pulsing light source.
290290
Chloride Batterijen B.v.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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