Browse Prior Art Database

SURFACE MOUNTED RADIO-CHARGER CONTACTS IN RECHARGABLE BATTERIES

IP.com Disclosure Number: IPCOM000005801D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-07
Document File: 1 page(s) / 39K

Publishing Venue

Motorola

Related People

Howard Lang: AUTHOR

Abstract

Unreliable riveted electrical contacts used to connect external feed thru radio-charger contacts to internal battery circuits.

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MOTOROLA Technical Developments Volume 9 August 1989

SURFACE MOUNTED RADIO-CHARGER CONTACTS IN RECHARGABLE BATTERIES

by Howard Lang

THE PROBLEM

Unreliable riveted electrical contacts used to connect external feed thru radio-charger contacts to internal battery circuits.

THE SOLUTION

   A metal contact designed for surface mounting on a flex-circuit to give the optimum electrical connection of contact to circuit. The circuit could then be positioned within the plastic housing and the contacts (2 to 4 at a time) would then be inserted thru holes in the housing using ultrasonic energy.

   When the ultrasonic power is applied, plastic melts under the sharp edge of the larger diameter of the in- dividual contact. Molten plastic is forced into the locking groove of the contact with the action of the press inserting the contact. The molten plastic material solidifies around the contact affecting a water resistant seal which requires upwards of 50 Ibs. of force to push out.

U/S WELDER

+

HOUSING

I I' CONTACl

SOLDER

7 ' . c CIRCUIT

I

SUFF'ORT FIXTURE

I

0 Motorola, Inc. 1989 68

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