Patent ID: 11948758
Assignee: MITSUMI ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A push switch comprising:
a circuit substrate;
two fixed contacts disposed on the circuit substrate;
a non-conductive spacer disposed on the circuit substrate;
a dome-shaped spring which is disposed on the non-conductive spacer so as to be located above the two fixed contacts and can be displaced between a first position in which the two fixed contacts are in a non-conductive state and a second position in which the two fixed contacts are in a conductive state; and
a conductive elastic member disposed on a surface of the dome-shaped spring facing the circuit substrate,
wherein the dome-shaped spring has a central movable portion and a marginal portion formed so as to surround an edge of the central movable portion and extend from the edge of the central movable portion toward a lower and outer side,
wherein the conductive elastic member is formed into a layer structure containing an elastic portion adhering on a surface of the central movable portion of the dome-shaped spring facing the circuit board and a conductive layer disposed on a surface of the elastic portion facing the circuit board,
wherein when the dome-shaped spring is displaced to the second position, the two fixed contacts are in the conductive state through the conductive layer, and
wherein a lower end of the marginal portion of the dome-shaped spring is placed on the non-conductive spacer, and wherein a gap is between a center portion of the marginal portion and the non-conductive spacer.