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US 4,477,700 AGranted
Tactile membrane keyboard with elliptical tactile key elements
AssigneeRogers Corporation
InventorsFrederick A. Balash, Mary T. Caton
Life of this patent
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Abstract
A tactile or snap action membrane keyboard is presented wherein the tactile or snap action key elements are protrusions in a membrane sheet, each protrusion having a flat elliptical top surface or plateau with a plurality of inclined ramps from the base sheet to the plateau.
Claims11
A tactile snap action switch element comprising:
- a sheet of base material;
- and
- at least one snap action protrusion formed in said sheet of base material, said protrusion being elliptical.
A keyboard comprising:
- a sheet of base material;
- a plurality of tactile elements formed in said sheet of base material, each of said tactile elements being an elliptical protrusion in said base material asymmetric with respect to a line or plane of reference;
- first electrically conductive means associated with each tactile element;
- and
- second electrically conductive means aligned with each of said tactile elements, said first electrically conductive means contacting said second electrically conductive means to complete an electric circuit upon actuation of each of said tactile elements.
2 more elements
Dependencies are inferred from the claim text.