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

Claim 6:
7. A push switch comprising:
a circuit substrate;
a central contact disposed on the circuit substrate;
an outer contact disposed on the circuit substrate so as to be spaced apart from the central contact;
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 central contact and the outer contact and can be displaced between a first position in which the central contact and the outer contact are in a non-conductive state and a second position in which the central contact and the outer contact 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 central contact and the outer contact are in the conductive state through the dome-shaped spring and the conductive elastic member, 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 spacers.