Sheet-like key top and its manufacturing method
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United States of America Patent
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-
Aug 15, 2000
Grant Date -
N/A
app pub date -
Apr 7, 1998
filing date -
Apr 14, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To make spherical shape of the terminal end of extruding part of a push-button switch to press a curved contact portion composed of a metal belleville spring and a resin film dome. In addition, the gate injecting mouth 4 for thermoplastic material 3 is opened in the side surface of the extruding part 2 or in the side projection made in a mold to inject the resin material in order to make molding of spherical shape of the terminal end of extruding part 2 of a push-button switch possible. By this structure, the present invention can provide a sheet-like key top having improved clicking touch and preventing break of a contact portion by residual stress.
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