Patent ID: 7213335

Claim:
A method for producing a printed circuit board comprising the steps of: forming a first conductive layer on a first main side of an insulating board, forming holes through preset areas of said insulating board and said first conductive layer formed on the first main side of the insulating board, bonding a second conductive layer to a second main side of said insulating board, said second conductive layer passing over said holes, the second main side being opposite to the first main side, forming a third conductive layer on the whole first main side of said insulating board and in said holes after said bonding of said second conductive layer, masking the third conductive layer in at least one of said holes with a plating resist, plating a plate layer on exposed portions of said third conductive layer, patterning said first conductive layer to form a first conductor pattern, patterning said second conductive layer to form a second conductor pattern, and removing said plating resist and said third conductive layer from an area which had been covered with said plating resist.