Patent ID: 6302317
Filing Date: 2001-10-16
Classification: H01L,Y10T

Abstract:
A bump bonding apparatus comprising:a bonding head for forming bumps on a wafer having an orientation flat on a circumferential edge thereof;a bonding stage for supporting and positioning the wafer such that said bonding head is operable to form bumps on the wafer, said bonding stage including:a first pair of positioning rollers located at a first end of said bonding stage;a second pair of positioning rollers located at a second end of said bonding stage so as to face said first pair of positioning rollers in an opposing relation;a flotation-air blowing component for floating a wafer on a top surface of said bonding stage;a turning-air blowing component for rotating the wafer on said top surface of said bonding stage;a first positioning air outlet for stopping a rotation of the wafer by biasing the wafer against said first pair of positioning rollers;a second positioning air outlet for stopping a rotation of the wafer by biasing the wafer against said second pair of positioning rollers; anda switching device for switching an air supply to one of said first positioning air outlet and said second positioning air outlet; anda transporting device for transporting the wafer to said bonding stage and placing the wafer on said bonding stage in a prearranged orientation, said transporting device including an orientation flat detection component for detecting a position of the orientation flat of the wafer supported by said bonding stage.