Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-08-13
1985-06-18
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
307356, 307358, 340628, 250384, G08B 1710
Patent
active
045243514
ABSTRACT:
In a smoke detector of the type in which smoke is detected in a detection chamber based upon a variation of an ionization current flowing therein or a variation of light beam passing therethrough, there is provided a reference signal generating section which produces a reference signal having a predetermined characteristic corresponding to typical smoke flowing into the detection chamber when a fire occurs, and a signal comparison section which compares a detection signal detected in the detection chamber with the reference signal, wherein a smoke sensing signal is produced when the detection signal is determined as a signal due to a fire but is not produced when the detection signal is determined as the signal due to the entry of an insect into the detection chamber or due to cigarette's smoke flowing thereinto.
REFERENCES:
patent: 3618061 (1971-02-01), Livers
patent: 3781692 (1973-12-01), Escoffier
patent: 3823601 (1974-07-01), Hoppesch
patent: 3900785 (1975-08-01), Alric et al.
patent: 3946374 (1976-03-01), McMillian et al.
patent: 4260907 (1981-04-01), Winebarger
patent: 4335378 (1982-06-01), Coleman
patent: 4401978 (1983-08-01), Solomon
Fujii Hirofumi
Kimura Tetsuo
Yonezawa Tatuo
Yuasa Hayami
Myer Daniel
Nittan Company Limited
Rowland James L.
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