| 摘要 |
PURPOSE:To elevate the rate of operation of a wire bonder by a method wherein even if an interval between the tip of a bonding wire and the electrode of the bonding torch becomes to be large, a regular ball is formed. CONSTITUTION:When the gap between the tip of the wire 2 and the electrode 8 of the electric torch bocomes large, the current in a conductor 10 is reduced. Misdischarge is detected 11 and is amplified 12, and when it is decided 13 that the current is smaller than the regular ball forming current, a signal is generated to drive the power source 9, and a voltage higher than the egular voltage is supplied again. Terefore, even if the gap is larger than the prescribed value, a regular ball is formed. When the regular current does not flow in the conductor 10 after said process, it is decided 13 for the first time as the faulty ball formation, or when the wire 2 is not fed to the tip of the capillary 4 on account of cutting off of the wire 2, the current does not flow and the machine is made to stop without delay. |
