Patent ID: 6119917
Filing Date: 2000-09-19
Classification: B23K,G05B,H01L

Abstract:
A wire bonding apparatus comprising: a bonding arm which has a bonding tool at one end thereof and is supported by a plate spring so as to swing upward and downward, a linear motor which drives said bonding arm in a swinging motion, a position sensor which detects a position of said bonding arm in a vertical direction, a computer which processes signals from said position sensor and calculates a height position of said bonding arm and a limit value of a driving current that flows through said linear motor, a position control circuit which controls maintenance of a height position or a movement of said bonding arm in accordance with commands from said computer, a motor driver which generates a driving current in accordance with commands from said position control circuit and has a current limiter function that limits an amount of driving current in accordance with commands from said computer, and an external input-output means which inputs instructions into said computer and outputs results from said computer, wherein said bonding apparatus is characterized in that said computer is provided with a memory which stores a correction current value that corrects a driving force of said plate spring at said height position of said bonding arm, and said limit value of said driving current according to a bonding load.