Tactile membrane keyboard with elliptical tactile key elements

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

1983-11-14

1984-10-16

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200275, H01H 100, H01H 1370

Patent

active

044777000

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.

REFERENCES:
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patent: 3860771 (1975-01-01), Lynn et al.
patent: 3898421 (1975-08-01), Suzumura
patent: 3930083 (1975-12-01), Pinkham
patent: 4096364 (1978-06-01), Lynn et al.
patent: 4127758 (1978-11-01), Lowthorp
patent: 4128744 (1978-12-01), Seeger
patent: 4190748 (1980-02-01), Langford
patent: 4245138 (1981-01-01), Harper
patent: 4307268 (1981-12-01), Harper
patent: 4314116 (1982-02-01), Gordon
patent: 4322587 (1982-03-01), Burns et al.

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