Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1993-04-23
1995-03-21
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250384, 2503851, G01T 1185, G08B 17113
Patent
active
053998642
ABSTRACT:
An ionization type smoke detector includes a detector body, a printed circuit board on the upper surface of the detector body, an electrode mount on the upper surface of the printed circuit board, an inner electrode securing the electrode mount onto the printed circuit board and which has a radioactive source, an intermediate electrode screwed onto the electrode mount in such a way as to be situated above the inner electrode, and an outer electrode covering the electrode mount, the inner electrode and the intermediate electrode. The outer electrode has a plurality of smoke inlet windows, and is fixed to the upper surface of the printed circuit board by inserting engagement members at the lower end thereof into insertion holes of the printed circuit board. The electrode mount has an FET accommodating section including a first socket, whereas a second socket is formed on the printed circuit board. Electrodes of an FET are connected to the sockets, respectively. The detector also includes a wind shield ring surrounding the outer electrode and fixed to the upper surface of the printed circuit board by hooks extending into second insertion holes of the printed circuit board. Further, a bug screen is interposed between the outer electrode and the wind shield. A shield case abuts the lower surface of the printed circuit board and is fixed to the lower surface thereof and electrically connected to the outer electrode. A protective cover covers these components and has smoke inlet windows.
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Patent Abstracts of Japan, vol. 13, No. 329 (P-904) Jul. 25, 1989.
Hatakenaka Ikuhisa
Hatori Nobuo
Higashi Kentaro
Igarashi Yoshinori
Kamihigoshi Makoto
Fields Carolyn E.
Nohmi Bosai Ltd.
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