Importance

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Abstract

A printed wiring board includes a first conductor layer, a resin insulating layer including inorganic particles and resin, a second conductor layer including a seed layer and an electrolytic plating layer, and a via conductor connecting the first conductor layer and second conductor layer and including the seed layer and electrolytic plating layer extending from the second conductor layer. The inorganic particles include first particles, second particles, third particles and fourth particles formed such that the first and second particles are solid particles, the third and fourth particles are hollow particles, the first and third particles form an inner wall surface of the opening in the resin insulating layer, the second and fourth particles are embedded in the resin insulating layer, the first particles have shapes that are different from shapes of the second particles, and the third particles have shapes that are different from shapes of the fourth particles.

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First Claim