Patent ID: 8500984

Claim:
A method for manufacturing a printed circuit board having an insulative board and a plurality of electroconductive pads arranged in a grid shape on said insulative board, the method comprising: a step for forming an electroconductive film on said insulative board; a step for forming a pattern on said electroconductive film so as to form said electroconductive pads, a lead wire connected only to electroconductive pads positioned at an outermost periphery of the plurality of electroconductive pads arranged in the grid shape so that at least one electroconductive pad not connected to said lead wire is disposed between the electroconductive pads connected to said lead wire, and inter-pad wiring for electrically connecting each of the electroconductive pads not connected to said lead wire to any of the electroconductive pads connected to said lead wire, said inter-pad wiring being disposed between adjacent electroconductive pads in a diagonal direction with respect to vertical and horizontal directions of said grid shape, wherein said inter-pad wiring includes a linear section that connects at least three of said electroconductive pads aligned diagonally on said insulative board; a step for plating each of said electroconductive pads by immersing said insulative board in a plating bath and energizing each of said electroconductive pads through said lead wire; and a step for removing said inter-pad wiring.