Nick A Calandrello

US Patent:

44396473, Mar 27, 1984

Filed:

Jul 14, 1982

Appl. No.:

6/398374

Inventors:

Nick Calandrello - Andover MA
Robert Dimodana - Pelham NH
Louis Skarbek - Burlington MA
Don Gove - Manchester MA
Edwin Cooper - Tewksbury MA
John McKenzie - Tewksbury MA

International Classification:

H01H 1370

US Classification:

200 5A

Abstract:

An improved capacitive keyboard uses a standard printed circuit board provided in various locations with spaced conductor pairs. A conductive disc with a flat insulated lower surface is aligned above each conductor pair. All of the discs are suspended above the printed circuit board within apertures of a web of polymer foam material and held in position by a sheet of adhesive covered plastic that covers and adheres to the entire upper surface of the web and each of the discs.