Charles D Stelzner

US Patent:

44905874, Dec 25, 1984

Filed:

Apr 7, 1983

Appl. No.:

6/482832

Inventors:

Paul H. Miller - Wheaton IL
Charles D. Stelzner - Hoffman Estates IL

Assignee:

Microdot Inc. - Darien CT

International Classification:

H01H 1370

US Classification:

200 5A

Abstract:

A switch assembly comprising a flexible face cover membrane; a flexible keyboard membrane positioned immediately below the face cover membrane and including a base portion and a plurality of raised hollow contact pad portions projecting upwardly from the base portion through openings in the face cover member; a flexible printed circuit board membrane positioned below the keyboard membrane for switching coaction with the contact pad portions of the keyboard membrane; and adhesive means bonding the membranes together into a thin, flexible sealed switch sandwich. In one embodiment of the invention, the keyboard membrane is formed of a non-conductive elastomeric material and conductive elastomeric buttons are secured to the underside of the contact pad portions of the keyboard membrane for coaction with printed circuitry on the upper surface of the circuit board membrane.