Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
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
Hochiki Corporation
Willis Davis L.
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