Ionization-type smoke detector

Details Ionization-type smoke detector Ionization-type smoke detector

1986-08-18

1988-08-02

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250382, 250384, 2503851, H01J 4700, G01N 2764

Patent

active

047615575

ABSTRACT:
In order to provide an ionization-type smoke detector, wherein the radiation from a radioactive source mounted on the inner electrode disposed within the inner ionization chamber also reaches into the outer ionization chamber through a through-hole formed in the intermediate electrode, which is easy to assemble and which has a constitution to prevent scattering of the radioactive source even though inner and outer ionization chambers are provided with the insulation base board for supporting the inner and intermediate electrodes at a predetermined spacing is connected to the printed circuit board by a mounting rod, and the outer electrode surrounding the intermediate electrode and the insulation base board with smoke inlet openings is connected at its end periphery to the printed circuit board, the printed circuit board being connected to the base of the detector by connecting pins.

REFERENCES:
patent: 4396840 (1983-08-01), Araki et al.

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