| 主权项 |
1. A method of manufacturing an electronic component module, the method being used to join a plurality of outer terminals of a bare IC respectively to a plurality of bumps provided on one surface of a substrate, the method comprising the steps of:
forming, on flat surface electrodes on the one surface of the substrate, the plural bumps in a stepped shape such that each bump includes a thicker portion having a relatively large thickness and a thinner portion having a relatively small thickness, and that, when looking at the bare IC in a mounted state in a plan view, the thicker portion is positioned on side closer to a center of the bare IC relative to corresponding one of the outer terminals, and the thinner portion is positioned on opposite side away from the center of the bare IC relative to the corresponding outer terminal; and forming a plurality of joining portions, which join the plural outer terminals, through deformation of the bumps, such that a height of each joining portion on the opposite side away from the center of the bare IC when looking at the mounted bare IC in a plan view is lower than a height of the joining portion on the side closer to the center of the bare IC, wherein the plurality of the outer terminals which are bumps are respectively formed immediately under the bare IC, the joining portions are respectively located immediately under the plurality of the outer terminals which are the bumps, the plurality of the outer terminals which are bumps are respectively joined with the joining portions formed on the flat surface electrodes, and the plurality of joining portions are respectively formed in contact with a top surface of the flat surface electrode and a bottom surface of the bare IC. |
