Browse Prior Art Database

ELECTRONIC, PLASTIC, TOUCH CONTACT

IP.com Disclosure Number: IPCOM000005873D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-13
Document File: 1 page(s) / 45K

Publishing Venue

Motorola

Related People

Mark Malon: AUTHOR [+2]

Abstract

Described herein is a use of conductive plastic as the current carrying medium for realizing a switching device. This allows for a "touch" capability in any form factor that has been previously limited to a metal surface.

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MOTOROLA Technical Developments Volume 10 March 1990

ELECTRONIC, PLASTIC, TOUCH CONTACT

by Mark Malon and Steve Reno

Abstract: Described herein is a use of conductive plastic as the current carrying medium for realizing a switching device. This allows for a "touch" capability in any form factor that has been previously limited to a metal surface.

This concept comprises two separately existing technologies, which in combination produce a moldable interface and non-mechanical switch.

   Compounded plastic is used in varying forms in industry to protect against electrostatic discharge (ESD) and elec- tromagnetic interference (EMI). This is accomplished by formulating nickel-plated graphite or stainless steel fibers in varying concentrations within plastics. By molding in any color and form, many variations can be obtained in a products packaging. By using an elastomer, quick assembly can be made to a printed circuit board and ultimately the switching circuit.

   The switch is a 555 timer chip in a one shot configuration used as a debounce circuit. This is common today in wall or lamp touch dimmer units. The trigger input is pulled low by the grounding effect of touching the conductive plastic. The circuit then sends a pulse to the UP switch input in the customer unit, thus generating the desired effect.

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0 TOUCH YIRE

OUTPUT TO UP SY ITCH INPUT

0 Motorola, Inc. 1990 57

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