G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 17/11 (2006.01) G08B 17/113 (2006.01)
Patent
CA 2094735
An ionization type smoke detector includes: a detector body; a printed circuit board arranged on the upper surface of the detector body; an electrode mount arranged on the upper surface of the printed circuit board; an inner electrode which secures 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; an outer electrode which covers the electrode mount, the inner electrode and the intermediate electrode, which has a plurality of smoke inlet windows, and which 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; a wind shield ring which surrounds the outer electrode, which controls the speed at which air flows into the smoke inlet windows, and which is fixed to the upper surface of the printed circuit board by inserting hooks formed at the lower end thereof into second insertion holes of the printed circuit board; a bug screen placed between the outer electrode and the wind shield ring; a shield case abutting on the lower surface of the printed circuit board and fixed to the lower surface thereof and electrically connected to the outer electrode; and a protective cover covering these components and having smoke inlet windows.
Hatakenaka Ikuhisa
Hatori Nobuo
Higashi Kentaro
Igarashi Yoshinori
Kamihigoshi Makoto
Marks & Clerk
Nohmi Bosai Ltd.
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