In a first aspect of the present disclosure, a spring plate includes a central portion; a first leg portion projecting outward from an edge of the central portion; and a second leg portion projecting outward from the edge of the central portion. The first leg portion includes a hollow portion that is positioned within an outline of the first leg portion in a top plan view, and the second leg portion includes a hollow portion that is positioned within an outline of the second leg portion in a top plan view.

A push switch includes a housing including a bottom wall and a side wall, the housing extending in a first axis direction and a second axis direction in a plan view, and a fixed contact member configured to come into contact with a movable contact member, the fixed contact member being embedded in the bottom wall of the housing by insert molding, wherein the fixed contact member includes: a first terminal exposed to an outside from a first end portion in the first axis direction of the housing; and first extension portions, constituting a pair, that are both ends of the first terminal in the second axis direction, the first extension portions being bent upward and being embedded in the bottom wall or the side wall of the housing, or in both the bottom wall and the side wall of the housing, by the insert molding.

A key stabilizer is provided, in which the key stabilizer includes a keycap and a balance bar. The keycap has a bottom surface and two protruding portions disposed thereon. The keycap moves back and forth along a vertical direction between a top position and a bottom position. Each of the two protruding portions has an engaging portion at the end thereof. The bottom surface faces the bottom position, and the two protruding portions are arranged along a horizontal direction that is perpendicular to the vertical direction. The balance bar has a hinge portion and two side portions respectively connected to both ends of the hinge portion. The hinge portion is positioned on a rotation axis parallel to the horizontal direction. The end of each of the two side portions that is away from the hinge portion is inserted into the engaging portion.

In a first aspect of the present disclosure, a spring plate includes a central portion; a first leg portion projecting outward from an edge of the central portion; and a second leg portion projecting outward from the edge of the central portion. The first leg portion includes a hollow portion that is positioned within an outline of the first leg portion in a top plan view, and the second leg portion includes a hollow portion that is positioned within an outline of the second leg portion in a top plan view.

A device according to claim 6, characterised in that the interrupting zone is positioned outside the switch zone in which two wires (54, 56) of a circuit are so arranged as to cooperate with the switch are positioned.

A method of manufacturing a waterproof board switch according to the first embodiment comprises the following steps: (A) arranging a plurality of print circuit boards on a board plate, each of the print circuit board having a top pattern on a front surface and a bottom pattern on a rear surface; (B) insulating the rear surface of the print circuit board; (C) forming a board ass'y by thermo-compression bonding an insulation adhesive film having a dome hole to the front surface of the print circuit board; (D) forming a plurality of board holes near both edges of the dome hole on the board ass'y; (E) resting a metal dome on the dome hole such that the metal dome is able to be in contact with the top pattern; (F) arranging a top coverlay having bigger width than the insulation adhesive film on the board ass'y such that the top coverlay covers the dome hole; (G) arranging a thermoplastic resin above the top coverlay, arranging a top jig above the thermoplastic resin, arranging a bottom jig below the board ass'y and then applying thermo-compression to the thermoplastic resin by means of the top jig and the bottom jig; (H) making the thermoplastic resin having flowability flow from the top coverlay to the board hole by the step (G) such that ends of the top coverlay are bended so as to be in contact with sides of the board ass'y and then are inserted into the board hole, and then thermo-compression bonding the top coverlay to the top of the board ass'y and the sides of the board ass'y by means of the thermoplastic resin; and (I) separating the board ass'y to which the top coverlay was bonded from the board plate after the step (H).