Light-transmission type smoke detector having a spiral optical p

Details Light-transmission type smoke detector having a spiral optical p Light-transmission type smoke detector having a spiral optical p

1986-03-05

1987-10-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356438, 340630, G01N 1507

Patent

active

047000791

ABSTRACT:
In a light-transmission type smoke detector, a smoke chamber is composed of a disc-like block of a non-conductive material one side of which has a spiral groove and is coated with a conductive bright metal film and a casing mounted on the block, said casing having a plurality of labyrinth structure smoke entrances. An electric circuit system is placed on the other side of the disc-like block and is covered by a shield sheet. The shield sheet and the coating metal film are electrically connected to shield the electric circuit system.

REFERENCES:
patent: 4203100 (1980-05-01), Yamauchi et al.
patent: 4383253 (1983-05-01), Lam et al.
patent: 4386388 (1983-05-01), Beun
patent: 4547673 (1985-10-01), Larsen et al.
patent: 4626695 (1986-12-01), Keeler

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