A labyrinthine light scattering-type smoke detector

Details A labyrinthine light scattering-type smoke detector A labyrinthine light scattering-type smoke detector

1986-08-18

1988-07-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356439, G01N 1507, G01N 2100

Patent

active

047587334

ABSTRACT:
A light-scattering-type smoke detector having a projecting element and a light receiving element surrounded by a labyrinth is disclosed wherein the labyrinth comprises an array of a plurality of light shielding columns arranged in a circle each having a substantially J-shaped cross section, and the head portion of each column is inclined relative to the bisector of an angle formed between the lines connecting a first reflecting point with the projecting and light receiving elements, the light shielding columns having darkly colored light reflective surfaces.

REFERENCES:
patent: 4469953 (1984-09-01), Fujisawa et al.

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