Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-09-19
1981-02-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, G01N 1506
Patent
active
042490820
ABSTRACT:
A photoelectric smoke sensing chamber in a smoke sensing blind box which comprises a cylindrical body having inner and outer walls with vertical openings with both ends of the cylindrical body closed, the chamber being characterized by inner and outer walls fixed into an annular base and upwardly extended to the ceiling of the cylindrical body; a support for a luminous element and a light receiving element, which support is sealingly fitted into the inner edge of the annular base; light shading projections radially extended from at least one portion of the inner surface in full length of each of the inner and outer shell members; and a scattered light weakening layer formed at least on the inner surface of the cylindrical body for weakening scattered light occurring due to the reflection of the beam from the luminous element. The smoke sensing chamber is capable of preventing scattered light from entering the same from the outside, weakening the reflection and scattering of the beam from the luminous element in the chamber, maintaining a high smoke sensing ability, reducing the consumption of electric power, and preventing an erroneous alarm from being given.
REFERENCES:
patent: 3863076 (1975-01-01), Steele et al.
patent: 3868184 (1975-02-01), Marsocci
patent: 3916209 (1975-10-01), Steele et al.
patent: 3917956 (1975-11-01), Malinowski
patent: 3936814 (1976-02-01), Muller-Girard et al.
patent: 4099065 (1978-07-01), Malinowski
patent: 4099178 (1978-07-01), Ranney et al.
patent: 4129383 (1978-12-01), Malinowski
patent: 4166698 (1979-09-01), Steele
Kakigi Takao
Kakigi Yasugi
Cybernet Electronics Corporation
Nelms David C.
LandOfFree
Photoelectric smoke sensor box does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photoelectric smoke sensor box, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric smoke sensor box will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-552276