发明名称 |
Ionization-type smoke detector |
摘要 |
In order to provide an ionization-type smoke detector, wherein the radiation from a radioactive source mounted on the inner electrode disposed within the inner ionization chamber also reaches into the outer ionization chamber through a through-hole formed in the intermediate electrode, which is easy to assemble and which has a constitution to prevent scattering of the radioactive source even though inner and outer ionization chambers are provided with the insulation base board for supporting the inner and intermediate electrodes at a predetermined spacing is connected to the printed circuit board by a mounting rod, and the outer electrode surrounding the intermediate electrode and the insulation base board with smoke inlet openings is connected at its end periphery to the printed circuit board, the printed circuit board being connected to the base of the detector by connecting pins.
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申请公布号 |
US4761557(A) |
申请公布日期 |
1988.08.02 |
申请号 |
US19860897617 |
申请日期 |
1986.08.18 |
申请人 |
NOHMI BOSAI KOGYO CO LTD |
发明人 |
SASAKI, TORU;IGARASHI, YOSHINORI |
分类号 |
G08B17/113;(IPC1-7):H01J47/00;G01N27/64 |
主分类号 |
G08B17/113 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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