Scattered light smoke detector

Details Scattered light smoke detector Scattered light smoke detector

2008-04-29

2008-04-29

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S337000

Reexamination Certificate

active

10518616

ABSTRACT:
The smoke detector contains an optical measuring chamber, having a sensor arrangement (2) with at least one light source (12, 12′) and one light receiver (11), and a labyrinth system (7) with screens (16) arranged on the periphery of the measuring chamber. The light source (12, 12′) and the light receiver (11) are each arranged in a housing (14, 15; 13). The above-mentioned housings (14, 15; 13) have an elongated shape and a small window opening The at least one light source (12, 12′) and light receiver (12, 12′) are arranged in the rear part of their housings (14, 15; 13), so that between the window openings of the housings (14, 15; 13) and the light-penetrated optical surfaces of the at least one light source (12, 12′) and/or the lens of the light receiver (11) a relatively large gap is formed. This gap is preferably greater than the diameter of the above-mentioned optical surfaces, or of the above-mentioned lens.In the measuring chamber between the light exit and entry side of the housings (14, 15; 13) and the screens (16) opposite them, a compact, open scattering space is formed.

REFERENCES:
patent: 4616928 (1986-10-01), Leavitt et al.
patent: 4642471 (1987-02-01), Guettinger et al.
patent: 4897634 (1990-01-01), Sawa et al.
patent: 5021677 (1991-06-01), Igarashi et al.
patent: 5138302 (1992-08-01), Nagaoka et al.
patent: 5451931 (1995-09-01), Muller et al.
patent: 5497144 (1996-03-01), Schäppi et al.
patent: 5939994 (1999-08-01), Meier et al.
patent: 6521907 (2003-02-01), Shoaff et al.
patent: 2002/0084907 (2002-07-01), Rattman et al.
patent: 1198237 (2005-04-01), None
patent: 197 33 375 (1999-02-01), None
patent: 0 636 266 (1994-01-01), None
patent: 0821 330 (1998-01-01), None
patent: 0658 264 (1998-04-01), None
patent: 0880 118 (1998-11-01), None
patent: 0 926 646 (1999-06-01), None
patent: 1 087 352 (2001-03-01), None

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