Browse Prior Art Database

Sense Capacitor for Capacitive Keyboards

IP.com Disclosure Number: IPCOM000052398D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Harris, RH Williams, JA [+details]

Abstract

Capacitance keyboards are often exposed to relatively large changes in capacitance resulting from small contaminating particles between the capacitive plate members. As a result, it is desirable to have a key-board sensing capacitor which is able to change its capacitance at relatively large air gap separation distances to overcome the effect of small contaminating particles separating the plates.