| 摘要 |
PURPOSE: Disclosed is a two-step projecting bump which is formed on an electrode of a semiconductor chip by melting the end of a metallic wire passed through a capillary to form a metallic ball. CONSTITUTION: The two-step projecting bump which is formed on an electrode (4) of a semiconductor chip (8) by melting the end of a metallic wire (1) passed through a capillary (3) to form a metallic ball (2), bonding the ball (2) to the electrode (4), laterally moving and then lowering the capillary (3), welding the wire (1) to the top of the ball (2) bonded to the electrode (4), and tearing off the wire (1). A section (B) in which large crystal grains are grown by the thermal effect of the heat applied to the wire (1) at the time of melting the wire (1) and forming the ball (2) is formed in the joining section of the wire (1) with the ball (2) immediately above the ball (2).
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