| 摘要 |
A push button switch is provided to perform an operation of a switch certainly by contacting a second protrusion to a fixing contact even when foreign materials are filled on a fixing contact portion. A push button switch(10) includes a housing(20), a fixing contact(40), and a movable contact(50). The fixing contact is installed in the housing. The movable contact is made of an elastic conductive material in a shape of a dome and placed a top side of the fixing contact. A pair of protrusions are protrusively formed to a bottom side direction to be in contact with the fixing contact at a bottom side surface of the movable contact. A first protrusion(51) is formed at a vertex part of the movable contact as well as a second protrusion(52) is formed around the vertex part of the movable contact with being separated from the first protrusion.
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