Patent ID: 7268427

Claim:
A semiconductor package that can be mounted on a printed board, said semiconductor package comprising: a package board that is mounted with an exoergic circuit element; a heat spreader that transmits heat from the exoergic circuit element; and a jointing layer that is located between the exoergic circuit element and said heat spreader, joints the exoergic circuit element to said heat spreader, and is made of a solid jointing material that has substantially no elasticity, wherein said heat spreader includes a first surface jointed to the exoergic circuit element, and a second surface as a rear surface of the first surface, and wherein said heat spreader has a slit that extends in a substantially radial direction from an inner side of a first area to an outer side of the first area, the first area being jointed to the exoergic circuit element on the first surface or a second area that is an orthogonal projection of the first area onto the second surface, when said heat spreader is transparently viewed from the first or second surface.