| 摘要 |
PURPOSE:To make the shape of a bump constant so as to avoid poor bonding, by vibrating either a capillary or a part to be bonded, decreasing the strength of a piece of wire at a part directly over a ball, and cutting the wire, where the strength is decreased. CONSTITUTION:A ball 4 is formed at the tip of a piece of wire 2, which is inserted in a capillary 11. The capillary 1 is lowered, and the ball 4 is compressed and bonded to a part to be bonded. Thereafter the capillary 1 is lifted, and at least either the capillary 1 or the part to be bonded 6 is vibrated. Then the strength of a part 4a of the wire 2 directly over the ball 4 is decreased. Then the wire 2 is pulled and cut at a part, where the strength is decreased. Thus, the light of the wire 2 remaining at the ball 4 is made constant. Therefore the length of the wire 2 remaining on a bump 12 can be made constant at a sufficiently short state. Thus the bonding strength between the bump 12 and an external terminal can be made constant, and poor bonding is avoided. |
