Importance

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Abstract

A printed wiring board includes a first circuit substrate having first pads and second pads such that the first pads are positioned to mount an electronic component on the first circuit substrate and that the second pads are positioned to electrically connect the first circuit substrate to a second circuit substrate, and metal posts including plating material and formed on the second pads respectively such that the metal posts are positioned to mount the second circuit substrate on the first circuit substrate. Each of the metal posts has a height h1 and a thickness b such that the metal posts have a value h1/b which is greater than 0.1 and smaller than 1.0 where the value h1/b is obtained by dividing the height h1 by the thickness b.

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First Claim