CIRCUITRY TO MONITOR AND CONTROL SOURCE OF RADIANT ENERGY IN SMOKE DETECTOR
First Claim
Patent Images
1. A smoke detector comprising:
- a source which emits radiant energy;
a lens which focuses emitted radiant energy;
a sensor of radiant energy which is one of reflected or scattered off of the lens; and
control circuits coupled to the source and sensor, responsive to sensor output, to adjust at least one source electrical input.
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Accused Products
Abstract
A photo-electric smoke detector includes a source of radiant energy and a closed loop control circuit which responds to a radiant energy feedback signal to adjust an output characteristic of the emitted radiant energy and which evaluates a quality characteristic of the emitted radiant energy. The feedback circuit and the source can be intermittently activated. Emitted radiant energy is directed toward a lens. The feedback signal is proportional to radiant energy reflected or scattered off of the lens.
16 Citations
20 Claims
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1. A smoke detector comprising:
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a source which emits radiant energy; a lens which focuses emitted radiant energy; a sensor of radiant energy which is one of reflected or scattered off of the lens; and control circuits coupled to the source and sensor, responsive to sensor output, to adjust at least one source electrical input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A smoke detector which comprises:
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a housing which carries at least; a smoke chamber; an optical sensor which emits an electrical signal indicative of smoke in the chamber; a lens positioned to direct incident radiant energy, at least in part, into the chamber; and monitoring circuits which sense radiant energy reflected from the lens, which compares the sensed radiant energy to a predetermined standard and which, responsive thereto, generates a performance indicating signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A photo-electric smoke detector comprises:
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a source which emits radiant energy and a closed loop control circuit which responds to a radiant energy feedback signal to adjust an output characteristic of the emitted radiant energy and which evaluates a quality characteristic of the emitted radiant energy; and a lens where emitted radiant energy is directed toward the lens and where the radiant energy feedback signal is proportional to radiant energy which is one of reflected or scattered off of the lens.
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Specification