Browse Prior Art Database

PHOSPHORESCENT KEYPAD

IP.com Disclosure Number: IPCOM000005632D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-22
Document File: 1 page(s) / 51K

Publishing Venue

Motorola

Related People

Authors:
Bernard Gasparaitis Thomas Long

Abstract

The phosphorescent keypad is constructed with a base of resilient flexible material carrying a plurality of keys. Each key top includes phosphorescent material, such as zinc sulfide copper mixed with clear silicone rubber. A mask is provided on each key to define a silhoutte of a character allowing radiation of light from the phosphorescent material in the shape of the character. A peripheral margin of phosphorescent material is also exposed about each key for defining each key. The base is constructed of white opaque silicone to reflect light from the phosphorescent material. The base includes lower surface contacts with conductive material for pro- viding electrical contacts. The bottom side of the base is covered with conductive material soaced from the contact for providing an electrostatic shield, 0 Motorola, Inc. 1987 9