Importance

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Abstract

In an ionization-type smoke detector wherein inner, intermediate and outer electrodes are supported on an insulating base, an inner ionization chamber and an outer ionization chamber being constituted by the inner and intermediate electrodes, and the intermediate and outer electrodes respectively, and a radioactive source provided to irradiate both of the ionization chambers, a detector is disclosed wherein the insulating base is formed with a through-hole to connect its upper and lower parts, the inner electrode being passed through the hole to be supported inside the insulating base at its upper portion, and the outer electrode is supported on the outside of the insulating base at its upper parts with an intervening substance being interposed therebetween, whereby the mutual creepage distances between the respective electrodes are elongated.

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First Claim