Patent ID: 6590182
Filing Date: 2003-07-08
Classification: B23K

Abstract:
A laser repair method for a semiconductor wafer, comprising the following steps of:measuring a focal point of a laser beam on the wafer on a stage, adjusting a focus on each required part to be repair-processed, setting a focal point on which the laser beam is focused at a prescribed position in the required part to be repair-processed as a reference focal point, detecting a focal point at another position when the repair-processing is performed at said another position in the required part to be repair-processed, and performing repair-processing on the wafer by the laser beam by cutting and/or trimming a circuit pattern on a position in the required part of the wafer without adjusting the focal point, where a width of said circuit pattern is less than 1.0 &mgr;m, and interrupting the repair-processing on the required part when the focal point is outside an allowable range from the reference focal point without adjusting the focal point.