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

07365846

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

Affiliated with

Also associated with

Rating

Scattered light smoke detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Scattered light smoke detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scattered light smoke detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2775729