Patent ID: 9095082
Filing Date: 2015-07-28
Classification: H05K,Y10T

Abstract:
1. A method for manufacturing multilayer flexible PCBs, each of the flexible PCBs comprising n circuit layers, n representing an integer greater than 2, the method comprising: first, providing a flexible substrate strip, the flexible substrate strip comprising a plurality of PCB units, each PCB units comprising n segmental portions connected sequentially along a lengthwise direction of the flexible substrate strip; second, after the first step, forming traces in n−2 segmental portions of each PCB unit in a reel to reel process, the remaining two segmental portions left untreated without traces; third, after the second step, cutting the flexible substrate strip along border lines between the PCB units to separate the PCB units from each other; fourth, after the third step, folding each PCB unit in such a manner that the n−2 segmental portions having traces are arranged between the two segmental portions left untreated without traces; fifth, after the fourth step, laminating each folded PCB unit to form a plurality of laminated multilayer substrates; and sixth, after the fifth step, forming traces in the two segmental portions left untreated without traces.