Patent ID: 7929152
Filing Date: 2011-04-19
Classification: B23K,G01B,H01L

Abstract:
1. A method of detecting a press-bonded ball at a bonding position after bonding operation in a bonding apparatus including a capillary capable of performing bonding onto a workpiece, a detection camera disposed with a certain amount of offset from the capillary and a calculation control unit for controlling bonding operation and detecting operation, the method comprising the steps of: selecting a pad having thereon a press-bonded ball whose edge corresponding to a side in an X direction of the pad is definite, as well as a pad having thereon a press-bonded ball whose edge corresponding to a side in a Y direction of the pad is definite, the respective corresponding edges being determined by the calculation control unit based upon an image of the pad that is captured by means of the detection camera; detecting distances between the two sides of the pad and the respective corresponding edges, the distances being determined by means of the calculation control unit based upon the image in the selected pad; comparing detected values based upon the distances to determine whether or not the detected values respectively fall within predetermined allowable ranges by means of the calculation control unit; and correcting the amount of offset for a next press-bonded ball by means of the calculation control unit, if either of the detected values is outside an allowable range thereof, so that the next press-bonded ball comes within the allowable range; and wherein the detection camera and the calculation control unit are implemented in the bonding apparatus that comprises instructions stored in a readable memory medium and the calculation control unit that executes the instructions.