G - Physics – 08 – B
Patent
G - Physics
08
B
340/77, 340/140.
G08B 17/10 (2006.01) G08B 17/00 (2006.01) G08B 17/107 (2006.01)
Patent
CA 1056479
ABSTRACT OF THE DISCLOSURE A smoke detector and alarm is disclosed and includes a smoke chamber and a circuit connecting a light source, a first light sensitive resistor, a second light sensitive resistor and an electronic alarm. The smoke chamber has three light conduits or passages, the first of which permits light from the light source to illumi- nate the interior of the chamber, the second of which is positioned relative to the first so as to permit light from the first passage to fall on the second light sensitive resistor and the third of which is positioned again relative to the first so as to permit only light reflected by smoke present in the chamber to fall on the first light sensitive resistor. The circuit includes an alarm circuit causing the alarm to emit a continuous sound when light from the light source is reflected by smoke present in the chamber onto the first light sensitive resistor and a trouble circuit causing the alarm to emit an intermittent sound when light fails to fall on the second light sensitive resistor. The circuit of the smoke detector also prevents line voltage variations from inducing false-triggering of the alarm and also maintains the ratio of the resistance between the two light sensitive resistors constant so as to be unaffected by changes in brightness of the light source caused by variations in line voltage.
222844
Bray Chester W.
Muller-Girard Otto
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