Patent ID: 8455766

Claim:
A substrate for mounting an IC chip comprising; a printed substrate including a first build-up layer having a first conductor layer including a plurality of first conductor circuits: a low-elasticity resin layer formed on the first build-up layer of the printed substrate; a low-thermal-expansion substrate formed on the low-elasticity resin layer and comprising one of ceramics and silicon; a plurality of through-hole conductors extending through the low-thermal-expansion substrate and the low-elasticity resin layer; a second conductor layer including a plurality of second conductor circuits and formed on the low-thermal-expansion substrate, the through-hole conductors electrically connect the first conductor circuits of the first conductor layer in the printed substrate and the second conductor circuits of the second conductor layer on the low-thermal-expansion substrate; and at least one resin layer provided above the low-thermal-expansion substrate such that the at least one resin layer is interposed between the low thermal-expansion substrate and an IC chip when the IC chip is mounted to the substrate.