Patent ID: 8297488

Claim:
A method for forming bumps on a plurality of electrodes of a wiring board, comprising the steps of: (a) supplying a resin containing conductive particles and a gas bubble generating agent onto a first region so as to contiguously cover the plurality of electrodes on the wiring board; (b) then disposing a substrate having a wall surface perpendicular to a surface of the electrodes in direct contact with the wiring board and formed near a periphery of the electrodes so that the substrate faces the wiring board; (c) heating the resin to a temperature sufficient to generate gas bubbles from the gas bubble generating agent, the temperature being such that the conductive particles are not melted, to self-assemble the resin on the entire surfaces of the electrodes by the gas bubbles generated from the gas bubble generating agent; and after the step (c), (d) heating the resin at a temperature at which the conductive particles are melted to melt the conductive particles contained in the resin self-assembled on the electrodes, thereby forming the bumps on the entire surface opposite the wiring board of the electrodes.