A labyrinthine light scattering-type smoke detector
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United States of America Patent
Stats
-
Jul 19, 1988
Grant Date -
N/A
app pub date -
Aug 18, 1986
filing date -
Aug 24, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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