Woven mesh interconnect

Details Woven mesh interconnect Woven mesh interconnect

1998-09-01

2001-04-24

Kincaid, Kristine (Department: 2831)

Electricity: conductors and insulators

Conduits, cables or conductors

Combined

C174S07100B, C174S0720TR, C174S034000, C361S816000, C361S818000, C442S005000, C442S006000, C442S019000

Reexamination Certificate

active

06222126

ABSTRACT:

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
BACKGROUND OF THE INVENTION
The present invention relates generally to conductive elastomers and more particularly to a woven mesh interconnect.
Conductive elastomers are known in the art. A conductive elastomer typically comprises a non-conductive elastomeric material which has a plurality of conductive particles or flakes disposed therein. In operation, the conductive flakes or particles make an electrical connection between a device such as a packaged integrated circuit and a circuit board having electrically conductive pads or traces when the elastomer is placed between the device and the circuit board. The current carrying capacity of such an elastomer is small due to the resulting high resistance connection provided by the conductive particles of the elastomer. Further, the integrity of the connection varies from device to device since the concentration of conductive particles varies from contact to contact.
Some other conductive elastomers that are known are formed by encapsulating a plurality of conductive wires within an elastomeric material. These conductive elastomers are limited in the number of wires, the wire pitch and the number of rows of wires that can be used. These conductive elastomers also suffer from electrical and mechanical integrity problems. The wire in these elastomers require inherently high forces to assure electrical connection. Further, these wire elastomer designs exhibit a relatively large permanent deformation upon initial compression or once compressed they do not recover to the approximate initial starting height, which is referred to as compression set.
It would be desirable to have a flexible conductive elastomer which has a greater current carrying capacity as well as providing lower resistance connections and producing greater integrity of the connections.
BRIEF SUMMARY OF THE INVENTION
An electrical interconnect is comprised of a woven mesh in which an array of parallel wires is retained in spaced relation by a transverse array of nonconducting strands, the mesh being enclosed or encased within a resilient matrix. The conductive wires are on a close pitch such that a great number of wires are in contact with each contact pad to yield greater current carrying capacity and corresponding lower resistance. The closer pitch wires also provide greater redundancy of contact points. This structure can be custom configured in as many layers or in a variety of shapes as is desirable to achieve a given electrical performance or to suit an intended application. The woven mesh can be wrapped around a shaped substrate to provide electrical connections in a desired shape. The woven mesh interconnect can be integrated as part of a boot, wherein the boot receives an electrical device therein and the woven mesh interconnect provides electrical connection from the device within the boot to outside the boot. The woven mesh interconnect can be layered and shaped to form an interconnect which not only provides electrical interconnection but also provides a biasing force due to the shape of the device.


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