Storage type smoke detector

Details Storage type smoke detector Storage type smoke detector

1977-07-06

1978-10-31

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

340529, 340629, G01T 118

Patent

active

041236564

ABSTRACT:
In a storage type smoke detector which requires a predetermined time after an ionization smoke sensor detects a fire before a fire warning is issued, a charging circuit including a capacitor connected to a power supplying line is coupled with a discharging circuit for periodically discharging a voltage charged in the capacitor, and the discharging circuit is periodically closed by a P-channel type field effect transistor which is connected to an output end the ionization smoke sensor and which is supplied with a series of oscillating pulse.

REFERENCES:
patent: 3872449 (1975-03-01), Scheidweiler

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