Patent ID: 9699920
Date: 2017-07-04
CPC Classifications: H01L,H05K,Y10T

Claim:
1. A printed wiring board, comprising: a first substrate comprising a plurality of first pads and a plurality of second pads such that the plurality of first pads is positioned to mount an electronic component on the first substrate and that the plurality of second pads is positioned to electrically connect a second substrate to the first substrate; and a plurality of metal posts formed on the plurality of second pads, respectively, such that the plurality of metal posts is positioned to mount the second substrate on the first substrate and that each of the metal posts has an upper surface, a lower surface and a curved side surface forming a smallest diameter between the upper surface and the lower surface, wherein the first substrate and the plurality of metal posts satisfy that a ratio, b/e, is in a range from 0.3 to 1.0, where b represents a length of each of the metal posts and e represents a thickness of the first substrate.