Patent ID: 6555401
Filing Date: 2003-04-29
Classification: H01L

Abstract:
A computer-implemented method for inspecting and measuring a ball-shaped wire bond formed by an automated bonder pre-programmed to attach a connecting bond onto a bond pad of an integrated circuit, said bonder having an associated computer-controlled vision system, comprising the steps of:obtaining a first image of said bond pad before bond attachment; determining the coordinates of the center of said pad; instructing said bonder to attach said ball-shaped wire bond to the center of said pad; obtaining a second image of said bond pad after bond attachment, said second image comprising an image of the ball-shaped portion of said bond and an image of the wire portion of said bond; determining the coordinates of the center of said ball-shaped portion of said bond by computer processing of said first and second images; comparing said coordinates of said bond center and said pad center, thereby creating information for quality control of said bonder instruction and bonding process; and controlling said bond process quality by inputting new bonder instruction for correcting any identified differences between said center coordinates.