Patent ID: 7405478

Claim:
A substrate package structure comprising: bumps disposed on a surface side of a first substrate and a surface side of a second substrate, the bump at the first substrate and the bump at the second substrate being press-fitted to each other while the one surface of the first substrate and the one surface of the second substrate are confronted to each other, thereby connecting the first and second substrates to each other, wherein the bump at the first substrate is constructed so that the tip portion thereof is designed to have a flat surface, and the bump at the second substrate is constructed so that the tip portion thereof is designed to have a projecting portion narrower than the tip portion of the bump at the first substrate, wherein a width of the tip portions and a displacement between centers of the tip portions of the bumps of both the substrates are defined so that a first center of the tip portion of the bump at the second substrate is located within a predetermined range of displacements from a second center of the tip portion of the bump at the first substrate even when a positional displacement occurs in a plane direction between both the substrates under the state that the surface of the first substrate and the surface of the second substrate are confronted to each other.