Flexible circuit board with an electrically insulating adhesive

Details Flexible circuit board with an electrically insulating adhesive Flexible circuit board with an electrically insulating adhesive

1990-06-27

1993-08-31

Picard, Leo P.

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

179 88R, 156901, H05K 100

Patent

active

052411370

ABSTRACT:
Disclosed is a flexible circuit board comprising a pair of conductive films and an insulating adhesive layer sandwiched therebetween. The adhesive layer contains conductive powder in such a concentration that no leakage current occurs between the films. For the production of the flexible circuit board, the adhesive layer is first formed on at least one of the conductive layers and then the conductive layers are bonded with the adhesive layer therebetween. For the formation of a through hole portion in the board, pressure is applied at a predetermined spot on the board throughout the thickness thereof, to form recesses on both sides thereof, thereby compressing the corresponding portion of the adhesive layer. This increases the concentration of the conductive powder contained therein, which causes the adhesive layer between the recesses to be conductive and serve as a through hole portion for electrically connecting the two conductive films.

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