Patent ID: 6694614
Filing Date: 2004-02-24
Classification: B23K,H05K,Y10T

Abstract:
A laser processing method for inspecting and processing a printed circuit board for having electronic devices assembled thereon, the printed circuit board comprising at least a conductive first layer including a plurality of holes and an insulating second layer underneath the conductive first layer, said laser processing method comprising:applying a laser beam to a portion of the conductive first layer including one of the plurality of holes therein and to a corresponding portion of the insulating second layer underneath; optically detecting a reflected laser beam; judging whether or not the intensity value or the amplitude value of the reflected laser beam as a detected value conforms to a desired value; stopping laser processing of the portion of the insulating layer corresponding to the one of the plurality of holes in the conductive layer, if the detected value of the reflected laser beam differs from the desired value, wherein the one of the plurality of holes is deemed to be an abnormal hole; and processing the portion of the insulating layer corresponding to the one of the plurality of holes in the conductive layer when the detected value of the reflected laser beam conforms to the desired value.