JPS647397U

JPS647397U -

Info

Publication number: JPS647397U
Application number: JP10050887U
Authority: JP
Priority date: 1987-06-30
Filing date: 1987-06-30
Publication date: 1989-01-17

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示した断面図、第
２図は第１図の中間電極を取出して示した平面図
、第３図は本考案の中間電極の他の実施例を示し
た平面図、第４図は従来例を示した断面図、第５
図は従来の中間電極を取出して示した平面図であ
る。１……内部電離室、２……外部電離室、３……
絶縁部材、４……中間電極、５……放射線源、６
……内部電極、７……外部電極、８……開口穴、
９……回路基板、１０……網目開口板、１２……
網目開口部。 Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a plan view showing the intermediate electrode of Fig. 1 taken out, and Fig. 3 shows another embodiment of the intermediate electrode of the present invention. Fig. 4 is a sectional view showing the conventional example;
The figure is a plan view showing a conventional intermediate electrode taken out. 1... Internal ionization chamber, 2... External ionization chamber, 3...
Insulating member, 4... Intermediate electrode, 5... Radiation source, 6
...Internal electrode, 7...External electrode, 8...Opening hole,
9... Circuit board, 10... Mesh aperture plate, 12...
Mesh opening.

Claims

[Claims for Utility Model Registration] An internal ionization chamber containing an internal electrode equipped with a radiation source and partitioned by an intermediate electrode, and an external electrode formed outside the internal ionization chamber into which smoke can flow from the outside. In an ionization type smoke sensor comprising a partitioned external ionization chamber and in which radiation is irradiated from the radiation source to the external ionization chamber through an opening provided in the intermediate electrode, An ionization type smoke detector characterized by having a mesh structure with a rate of 50% or more.