Ionization type smoke sensing device

Details Ionization type smoke sensing device Ionization type smoke sensing device

1980-10-01

1983-08-02

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, G01T 118

Patent

active

043968406

ABSTRACT:
An ionization type smoke sensing device includes a printed board. An inner electrode made of heat-resistant metal is attached to the printed board and a radioactive source is fixed to the inner electrode. An outer electrode in the form of a bottomed cylinder made of heat-resistant metal and adapted to cover the inner electrode extends through the printed board and is integrally joined to a protective lid member made of heat-resistant metal at the back of the printed board. Therefore, the outer electrode and the lid member cooperate with each other to define an ionization chamber. The outer electrode is formed with smoke inlet ports for introducing smoke into the ionization chamber. The electric circuit serves to give pulse signals of a relatively high voltage to the outer electrode and to detect the presence of smoke on the basis of the amount of a current flowing through the inner electrode.

REFERENCES:
patent: 3500368 (1970-03-01), Abe
patent: 3767917 (1973-10-01), Lampart et al.
patent: 4044262 (1977-08-01), Minowa

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