Sheet-like key top and its manufacturing method

Details Sheet-like key top and its manufacturing method Sheet-like key top and its manufacturing method

1998-04-07

2000-08-15

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428195, 264132, 264241, 264267, 2643281, 200275, 200341, 200513, 15624416, 156277, B32B 300, H01H 110, B28B 500

Patent

active

061033464

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.

REFERENCES:
patent: 4155972 (1979-05-01), Hauser et al.
patent: 4449774 (1984-05-01), Takashi et al.
patent: 5152392 (1992-10-01), Isawa

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