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

Claim 7:
8. 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 dome-shaped spring which is disposed 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 conductive elastic member is formed into a layer structure containing an elastic portion adhering on a surface of a 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 the dome-shaped spring has:
a marginal portion which electrically contacts with the outer contact when the dome-shaped spring is in both of the first position and the second position, and
the central movable portion which does not electrically contact with the central contact when the dome-shaped spring is in the first position and electrically contacts with the central contact through the conductive layer of the conductive elastic member when the dome-shaped spring is in the second position.