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Floating Keytop, Electroluminescent Back-Lighted, Dome Switch Panel

IP.com Disclosure Number: IPCOM000039861D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Sassen, B [+details]

Abstract

This article describes a mechanical structure housing an electroluminescent light source such that the switch surface is fully and evenly lighted. Present-day dome switches with floating keytops back-lighted by electroluminescent panels leave a dead spot (no light) on the keytop surface above the keytop to switch contact point. The electroluminescent panel requires a hole to allow the keytop-actuating pin to make contact with the dome switch. This opening also facilitates tactile feel. The hole and its surrounding edges are not lighted, thereby leaving a dark spot on the keytop surface. Nomenclature imprinted on the surface of the key loses clarity. The keytop design and relocation of the electroluminescent panel disclosed herein eliminates this light loss. (Image Omitted) In the drawings, Fig.