Patent ID: 7905011

Claim:
A method for forming bumps on electrodes of a wiring board, comprising the steps of: (a) supplying a fluid containing conductive particles and a gas bubble generating agent onto a first region including the electrodes on the wiring board; (b) disposing a substrate having a protruding surface formed on a main surface thereof so that the protruding surface faces the first region of the wiring board; (c) heating the fluid to generate gas bubbles from the gas bubble generating agent contained in the fluid; and (d) heating the fluid to melt the conductive particles contained in the fluid, wherein in the step (c), the fluid is self-assembled on the electrodes by the gas bubbles generated from the gas bubble generating agent, and in the step (d), the conductive particles contained in the fluid self-assembled on the electrodes are melted to form the bumps on the electrodes.