Ionization type-smoke detector

Details Ionization type-smoke detector Ionization type-smoke detector

1987-01-16

1988-11-22

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250384, G01T 118

Patent

active

047868112

ABSTRACT:
An ionization-type smoke detector having inner and outer ionization chambers, a radioactive source to ionize the air within the inner and outer ionization chambers and a printed board to mount electrical circuits for detecting electrical potential at the connecting portion between both chambers is made to be relatively thin by arranging the inner, intermediate and outer electrodes so that they are respectively vertically mounted to the printed board while being transversally spaced apart from each other.

REFERENCES:
patent: Re30323 (1980-07-01), Tomioka
patent: 3662177 (1972-05-01), Sasaki et al.
patent: 4234877 (1980-11-01), Maruyama et al.
patent: 4594512 (1986-06-01), Sasaki
patent: 4652866 (1987-03-01), Siegmann et al.

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