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SINGLE POLE PUSH SWITCH USING ELASTOMERIC ACTUATOR AND EDGE PLATED PCB

IP.com Disclosure Number: IPCOM000006299D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-21
Document File: 1 page(s) / 58K

Publishing Venue

Motorola

Related People

Thomas Brand: AUTHOR

Abstract

Many electronics devices, such as pagers, contain one or more single pole switches along exterior edges of the housings. Typical switches require fixturing for loca- tion as well as heat shielding during reflow soldering. The electronics device often contains a separate actuator for operating the switch. Also, with the change from CFC cleaning agents to semi-aqueous solvents in elec- tronic assembly cleaning, the additional need to shield switches from solvent and water intrusion during clean- ing has become an issue. This idea uses an elastomeric actuator combined with edge plating on the main PCB to eliminate the need for a separate switch component and the subsequent fixturing and shielding requirements.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

SINGLE POLE PUSH SWITCH USING ELASTOMERIC

ACTUATOR AND EDGE PLATED PCB

by Thomas Brand

  Many electronics devices, such as pagers, contain one or more single pole switches along exterior edges of the housings. Typical switches require fixturing for loca- tion as well as heat shielding during reflow soldering. The electronics device often contains a separate actuator for operating the switch. Also, with the change from CFC cleaning agents to semi-aqueous solvents in elec- tronic assembly cleaning, the additional need to shield switches from solvent and water intrusion during clean- ing has become an issue. This idea uses an elastomeric actuator combined with edge plating on the main PCB to eliminate the need for a separate switch component and the subsequent fixturing and shielding requirements.

In this design, switch terminals are created by using edge plating between conductors on both sides of the

main radio PCB (Figure I), or by plating internal and external runners brought out to the edge of the PCB (Figure 2). In both cases the terminals are preferably gold plated. An elastomeric actuator with a carbon con- tact pad would be designed such that the pager housing would retain the actuator without a secondary joining process (Figure 3).

  This cotiguration reduces the parts count from three (actuator, switch, and main PCB) to two (actuator and main PCB), therefore reducing material cost. In addi- tion...