Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-04-05
1998-02-17
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340630, 250573, 250574, 356339, G08B 1710
Patent
active
057195579
ABSTRACT:
The present invention provides for a smoke detection chamber and a photoelectric smoke detector containing the smoke detection chamber. The smoke detection chamber has side walls with openings provided therein for ingress and egress of smoke particles, a top and a bottom. A photoemitting diode is mounted in a mounting arrangement in the side wall of the smoke detection chamber to transmit a light beam across the smoke detection chamber without directly impinging upon either the top or the bottom surfaces. The bottom of the smoke detection chamber has an opening with a shielding arrangement thereabout open to the chamber located between the centerline of the smoke detection chamber and the mounting arrangement in the side wall of the chamber. A photodiode detector is positioned generally in the opening so that it views into the smoke detection chamber through the opening and shielding arrangement, the shielding arrangement shielding the photodiode detector from incident light which may be present in the smoke detector chamber while providing for a diverging field of view of the photodiode detector. The intersection of the field of view of the photodiode detector and the light beam of the photoemitting diode defines a detection volume contained within the smoke detection chamber located close to the photoemitting diode and the photodiode detector and spaced from the surfaces of the smoke detection chamber.
REFERENCES:
patent: 3799670 (1974-03-01), Kohr
patent: 4242673 (1980-12-01), Cooper
patent: 4315158 (1982-02-01), Kakigi et al.
Mi Zhexin
Rattman William J.
Digital Security Controls Ltd.
Hofsass Jeffery
Lieu Julie B.
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