Push switch

1. A push switch comprising:

a base member including a depressed accommodating part;

a fixed contact member provided and exposed in the accommodating part of the base member;

a movable contact member installed in the accommodating part and including a dome part configured to be reversible to contact the fixed contact member;

a sheet member installed to cover the accommodating part and hold the movable contact member;

a pusher member installed between a top of the dome part and the sheet member; and

a sheet-shaped reinforcing member formed of a material having a lower coefficient of thermal expansion than the sheet member, the reinforcing member being installed over the sheet member, the reinforcing member having a circular ring shape in a plan view and being adhered to the sheet member through an adhesive layer.

2. The push switch as claimed in claim 1 , wherein the reinforcing member is installed over the sheet member at least between a part of the sheet member joined to the base member and a center of the sheet member where the pusher member is installed.

3. The push switch as claimed in claim 2 , wherein a width of the circular ring shape is more than or equal to 40% of a radius of the dome part.

4. The push switch as claimed in claim 1 , wherein the reinforcing member has a hole at a position corresponding to the pusher member in a plan view.

5. The push switch as claimed in claim 4 , wherein

the pusher member is cylindrically formed,

an outer diameter of the reinforcing member is less than or equal to 150% of a diameter of the dome part, and

a diameter of the hole is more than or equal to 100% of a diameter of the pusher member.

6. The push switch as claimed in claim 1 , wherein the reinforcing member is installed on top of the sheet member.