Light scattering type smoke detector

Details Light scattering type smoke detector Light scattering type smoke detector

1995-07-07

1997-06-24

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 340629, 250574, 356438, G08B 1710

Patent

active

056420994

ABSTRACT:
A light scattering type smoke detector arranged such that even if the range in which light from an LED is emitted has a dispersion, a labyrinth member 90 in the light emitting range has no edge or only a predetermined labyrinth member exist therein. The labyrinth member 90 is preferably formed by a single plate larger than the other labyrinth members 9. The edges of the labyrinth members 9 are preferably formed to a curved surface or chamfered, and the dispersion of the 0 point of a detection output is reduced and the level of the 0 point of the detection signal is lowered to thereby accurately detect light scattered by smoke.

REFERENCES:
patent: 3681603 (1972-08-01), Scheidweiler et al.
patent: 4672217 (1987-06-01), Dobrzanski
patent: 4758733 (1988-07-01), Mochizuki
patent: 4851819 (1989-07-01), Kawai et al.
patent: 4857895 (1989-08-01), Kaprelian
patent: 4897634 (1990-01-01), Sawa et al.
patent: 5021677 (1991-06-01), Igarashi et al.
patent: 5138302 (1992-08-01), Nagaoka et al.

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