FORMING METHOD OF METAL BUMP, BUMP-FORMING DEVICE, AND TOOL FOR SHAPING BUMP

摘要

PROBLEM TO BE SOLVED: To provide the forming method of a metal bump that forms the metal bump in a columnar shape for reducing the transmission loss of a signal current, a bump-forming device for forming the bump, and a tool for shaping the bump. SOLUTION: A barrel-shaped bump 8 is formed on an electrode part 5 of a circuit element 6. When a specific load is applied to a tool 11 from the upper part of the bump 8, the outer-periphery surface of the bump is chipped by a cutting edge 12 being stuck to the tool 11. The diameter of the cutting edge 12 is smaller than that of an outer periphery on a horizontal section at the middle part of the barrel-shaped bump 8, and at the same time length in the perpendicular direction of the cutting edge 12 is longer than the height of the bump 8.