Browse Prior Art Database

THE ELECTRICAL INSULATION OF ELECTROPLATING BUS BARS IN FLEXES

IP.com Disclosure Number: IPCOM000006398D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2001-Dec-31
Document File: 1 page(s) / 57K

Publishing Venue

Motorola

Related People

Sam Hosseini: AUTHOR

Abstract

To prevent the flex's electroplating bus bar burr from shorting to a conductive substrate. See the illustration of the present condition.

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MOTOROLA INC. Technical Developments Volume 15

May 1992

THE ELECTRICAL INSULATION OF ELECTROPLATING BUS BARS IN FLEXES

by Sam Hosseini

PROBLEM:

  To prevent the flex's electroplating bus bar burr from shorting to a conductive substrate. See the illustration of the present condition.

SOLUTION:

  The electroplating process of the flexes require bus bar runners that would run off the edge of the flex. While the part is die cut, the bus bar runners are sheared,

PROPOSED SOLUTION

producing burrs which can cause electrical shorts when mounted by adhesive (PSA) to conductive sub- strate. This invention eliminates the shorting problem by cutting a notch into the flex and utilizing an insu- lator film (Mylar) as the adhesive carrier. The notch would recess the bus bar runners from the edge of the flex and the adhesive carrier would insulate the bus bar runners from the conductive mounting sub- strate. A notch will be cut into the part prior to the application of the adhesive. See the illustration of the proposed solution.

PRESENT CONDITION

CO"d"Ctl"e burr

I

7

A

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i

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Top view of the flex on substrate Top view 01 the flex on substrate

/base cost,cover coat /M bar runner

Suastrate S"bSt*ate

Sectlon A-A

Section A-A

0 Motorola. 1°C. 1992 39

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