Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-05-31
1997-04-22
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340693, 250573, G08B 1710
Patent
active
056232535
ABSTRACT:
A projected beam-type smoke detector of the type in which a light emitter having a light emitting element is separately mounted from a light receiver having a light pickup element in order to detect a fire by an attenuation in the level of light which the light receiver receives from the light emitter, attenuation being due to the presence of smoke between the light emitter and the light receiver. The detector, comprising the light receiver, a cover status sensor for sensing the closing or opening state of a cover that is closed or opened to allow adjustments such as optical axis adjustment, sensitivity setting for light input and the like, and a control block for controlling each section of the light receiver. The control block sets the adjustment mode to each section of the light receiver when the control block receives a cover open-state signal indicative of the opening of the cover from the cover status sensor. The adjustment mode is automatically set to each section of the light receiver. The light receiver preferably comprises a sensitivity setting status, whereby the control block releases the adjustment mode.
REFERENCES:
patent: 4131888 (1978-12-01), Galvin
patent: 4651013 (1987-03-01), Kajii et al.
patent: 4749871 (1988-06-01), Galvin et la.
patent: 4827247 (1989-05-01), Giffone
patent: 5381131 (1995-01-01), Mochizuki et al.
Ishida Mariko
Narumiya Junichi
Hockiki Kabushiki Kaisha
Hofsass Jeffery
Wu Daniel J.
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