Tear resistant flexible substrate

Details Tear resistant flexible substrate Tear resistant flexible substrate

2006-07-04

2006-07-04

Gibson, Randy W. (Department: 2841)

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

C174S262000, C361S749000, C361S750000, C361S751000

Reexamination Certificate

active

07071419

ABSTRACT:
A flexible circuit having improved tear resistance is provided. A flexible circuit, made of polyimide film, includes at least one extension which needs to be folded. To prevent tearing, an annular piece of metal, like an exposed copper pad for example, is placed at the apex of the bend angle. A second metal is then deposited atop the annular piece of metal, thereby reinforcing the annular piece of metal. The reinforced annular piece of metal helps to prevent the flexible circuit from tearing when shearing forces are applied to the extension. Experimental results have shown that the invention provides as much as a 285% increase in tear resistance when compared to prior art flexible circuits.

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