Browse Prior Art Database

Flex Cable with Integral Damper

IP.com Disclosure Number: IPCOM000023843D
Publication Date: 2004-Apr-01
Document File: 2 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

A means to reduce mechanical vibration of a flexible printed circuit is disclosed. Frequency response plots are included to demonstrate enhanced performance.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Flex Cable with Integral Damper

  Disclosed is a design for a flexible printed circuit (FPC) that incorporates damping to attenuate mechanical vibration. The design of a conventional FPC may consist of several laminates, for example:

A base layer of polyimide


1.


2.

An adhesive layer


3.

A layer of copper


4.

Another adhesive layer


5.

The invention disclosed here replaces one or both of the adhesive layers with a viscoelastic damping polymer. One proposed construction entails replacement of an adhesive layer over the entire area of the FPC. Alternatively, replacement of only part of the adhesive could be implemented if necessary to optimize lamination integrity for reliable life of the FPC.

The following frequency response plots demonstrate reduced vibration levels for the disclosed invention which is characterized by lower gain and higher damping ratios compared to a conventional FPC.

A cover layer of polyimide

1

Page 2 of 2

   Comparison of Frequency Response Performance: Disclosed Invention vs Conventional Flexible Printed Circuit

300

250

200

100

50

0

Conventional FPC

With Integral Damper (disclosed invention)

in

1% damping ratio for conventional FPC

150Ga

6% damping ratio with Integral Damper

200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700

Frequency (Hz)

Disclosed by Hitachi Corporation

2

[This page contains 2 pictures or other non-text objects]