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 a first portion of the emitted radiant energy into a smoke chamber for use in detecting a smoke concentration therein and which reflects a second portion of the emitted radiant energy;
a sensor which senses the reflected second portion of the emitted radiant energy; 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.
10 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 a first portion of the emitted radiant energy into a smoke chamber for use in detecting a smoke concentration therein and which reflects a second portion of the emitted radiant energy; a sensor which senses the reflected second portion of the emitted radiant energy; 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 a first portion of incident radiant energy, at least in part, into the chamber for use in detecting a smoke concentration therein and to reflect a second portion of the incident radiant energy; and monitoring circuits which compare the reflected second portion of the incident radiant energy to a predetermined standard and which, responsive thereto, generate 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, where a first portion of the emitted radiant energy is focused by the lens into a smoke chamber for use in detecting a smoke concentration therein, and where a second portion of the emitted radiant energy is reflected by the lens so that the radiant energy feedback signal is proportional to the reflected second portion of the emitted radiant energy.
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Specification