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Tactile-membrane-keyboard-with-elliptical-tactile-key-elements

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Tactile membrane keyboard with elliptical tactile key elements

Details

Inventors: Balash, Frederick A.; Caton, Mary T.;
Assignee: Rogers Corporation (Rogers, CT)
Primary Examiner: Scott; J. R.
Assistant Examiner:
Attorney, Agent or Firm: Fishman & Dionne

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.

DETAILED DESCRIPTION The tactile keyboard of this invention has keys formed in a membrane sheet which are elliptical in shape and have a plurality of inclined ramps around the key.
More specifically, each key is a protrusion having a flat elliptical top surface or plateau.
Each key also has four ramps from the membrane sheet to the plateau, at the major and minor axes of the ellipse.
A keyboard having keys according to this invention provides tactile feel for large key areas or out of the ordinary shaped key areas regardless of the point of application of actuating force.

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