Patent ID: 8302300

Claim:
A method for manufacturing a multilayer printed circuit board, the method comprising: providing a first copper clad laminate comprising a central portion and a peripheral portion; etching the peripheral portion of the first copper clad laminate to form a group of concentric copper annular collars, the group of concentric copper annular collars comprising a first copper annular collar and a second copper annular collar surrounding the first copper annular collar; determining a central axis of the first copper annular collar; laminating a second copper clad laminate and an adhesive layer onto the first copper clad laminate in a manner that the adhesive layer is sandwiched between the first and the second copper clad laminates, thus obtaining a multilayer substrate after determining the central axis; forming a detection hole through the multilayer substrate along the determined central axis; capturing an X-ray image of the multilayer substrate; analyzing the X-ray image to determine detection hole an offset distance between the detection hole and the determined central axis; and forming plated through holes in the central portion of the multilayer substrate based on the offset distance.