| 摘要 |
PROBLEM TO BE SOLVED: To dispense with a spacer and to increase the restoring force of a switch by molding a projection projecting from a sheet part with the shape of a dome by pressing a specific position of a flexible synthetic resin sheet by a metal mold, and shaping a rising portion rectilinearly or into the double dome. SOLUTION: A specific position of a flexible synthetic resin sheet such as polyethylene terephthalate or the like is pressed with a metal mold to form a projection 3 projecting from a sheet part 2 into the shape of a dome. Then the same is placed on a printed board 4, the sheet part 2 is placed on a wiring, and the projection 3 is mounted just above the wiring clearance part 6. This projection 3 is pressed by a key 1 having the information such as the number, character or the like on its apex face. Whereby the carbon 8 printed on a rear face of the apex of the projection 3 is pressed to the clearance portion 6 to achieve the continuity. In this dome switch 1, a rising portion 3b continued to the dome-shaped curved portion 3a of the projection 3, is rectilinear, and its angleθto the sheet part 2 is preferably 30-75 degree.
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