Scattered-light smoke detector with a shielding structure of detector circuits
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 30, 1990
Grant Date -
N/A
app pub date -
Dec 22, 1987
filing date -
Dec 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scattered-light smoke detector having an improved shield structure. A detector circuit is provided on a printed circuit board which is disposed at an upper portion of a smoke detecting section. The smoke detecting section includes a planar base and a surrounding wall extending downwardly from a lower surface of the base and having an opening or openings which allows or allow smoke to enter therethrough. The surrounding wall defines a smoke detecting space therein. A light emitting element and a photodetector element which are disposed at positions where they are not opposite each other and optical axes thereof intersect each other at a predetermined angle and said photodetector element can receive light from the light emitting element scattered by smoke entering the smoke detecting space. The printed circuit board is attached on an upper surface of the base. A shield layer is interposed between said printed circuit board and said base. Electric and/or electronic parts are formed in chips and packaged on an upper surface of the printed circuit board. A shield case is disposed so that it covers the electric and/or electronic parts.
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