Photoelectric, scattered light smoke detector

Details Photoelectric, scattered light smoke detector Photoelectric, scattered light smoke detector

1990-09-07

1992-08-11

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 340628, G08B 1710

Patent

active

051383020

ABSTRACT:
A photoelectric smoke detector has a circuit substrate coupled to an optical-system base as disposed in a circuit accommodating zone defined within a detector housing by the base together with a smoke supervisory zone, a light projecting element and an integrated circuit incorporating therein a light receiving element and smoke detecting means are mounted to the circuit substrate, and the optical-system base holds therein a light receiving lens which is capable of condensing scattered light from smoke particles onto the light receiving element in the integrated circuit on the circuit substrate. Effective reduction in the number of constituent parts is thereby attained, to promote reduction in manufacturing costs, and to effectively realize dimensional minimization.

REFERENCES:
patent: 2580500 (1952-01-01), Albert
patent: 4584485 (1986-04-01), Powers et al.
patent: 4897634 (1990-01-01), Sawa et al.

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