| 摘要 |
PURPOSE:To provide a ball formation device for wire bonder having high responding speed even when spark discharge is unstable, and capable of maintaining a stabilized supply of constant current at all time and forming the optimum ball diameter. CONSTITUTION:The formation of a loop which comprises a drive power supply circuit 11 connected with a power supply circuit 1 and a current control circuit 12 and a switch circuit 5 connected with the drive power supply circuit 11 makes it possible to inhibit the generation of phase lag, and form a constant ball diameter by supplying stabilized constant current between a wire 8 and a discharge electrode 10. |
