Smoke detector, adjustment apparatus and test apparatus for such

Details Smoke detector, adjustment apparatus and test apparatus for such Smoke detector, adjustment apparatus and test apparatus for such

1994-12-13

1997-09-30

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340501, 340628, 250574, G08B 1710

Patent

active

056730276

ABSTRACT:
An inexpensive smoke detector having excellent general versatility and reliability allows for an increase in a range of selecting light emitting devices used for such smoke detectors and allows for reductions in the number of processes and adjustment equipment, thereby reducing costs and avoiding human adjustment errors. The smoke detector includes an A/D conversion circuit for measuring an output from a photo transistor which receives a light output of at least a light emitting diode used for smoke detection. A MPU generates a signal for driving the light emitting diode, based on a value measured by the A/D conversion circuit. The smoke detector also includes an EEPROM. A D/A conversion circuit adjusts a light emission quantity of the light emitting diode based on a value read from the EEPROM. The smoke detector further includes a voltage/current conversion circuit.

REFERENCES:
patent: 4317113 (1982-02-01), Honma
patent: 4321466 (1982-03-01), Mallory et al.
patent: 4408880 (1983-10-01), Tsuji et al.
patent: 4647785 (1987-03-01), Morita
patent: 4647786 (1987-03-01), Guttinger et al.
patent: 4785283 (1988-11-01), Yuchi
patent: 4823015 (1989-04-01), Galvin et al.
Patent Abstracts of Japan, vol. 9, No. 79 (P-347) (1802) 9 Apr. 1985.

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