Light scattering type smoke detector having an improved zero-poi

Details Light scattering type smoke detector having an improved zero-poi Light scattering type smoke detector having an improved zero-poi

1994-09-02

1996-12-24

Gonzalez, Frank

Optics: measuring and testing

By particle light scattering

With photocell detection

356340, 250574, 340630, G01N 2100, G01N 2149, G08B 1710

Patent

active

055877907

ABSTRACT:
A light scattering type smoke sensor of the present invention has a plurality of labyrinth members for facilitating an inflow of smoke entering from the outside, and for cutting off light entering from the outside; a plurality of smoke inlets each of which is formed by a space between paired ones of the labyrinth members being adjacent to each other; a smoke detecting chamber which is formed in a center portion by the labyrinth members; light emitting device for radiating light toward the smoke detecting chamber; and light receiving device for detecting light which is scattered by the smoke in the smoke detecting chamber, the light receiving device having an optical axis which intersects in the smoke detecting chamber an optical axis of the light emitting device at a scattering angle in the range of 60.degree. to 80.degree., wherein one of the labyrinth members intersects the optical axis of the light emitting device, which has a reflecting face for reflecting light radiated from the light emitting device, the reflecting face reflecting the light in a direction opposite to the light receiving device.

REFERENCES:
patent: 4359556 (1985-09-01), Dederich et al.
patent: 4851819 (1989-07-01), Kawai et al.
patent: 4897634 (1990-01-01), Sawa et al.
patent: 5021677 (1991-06-01), Igarashi et al.
patent: 5302837 (1994-04-01), Sawa et al.

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