Patent ID: 9750133
Date: 2017-08-29
CPC Classifications: H05K,Y02P

Claim:
1. A printed circuit board comprising a substrate having a trench between a first region and a second region, the first region being a region where a first package is to be mounted, the second region being a region where a second package is to be mounted, wherein the substrate has a first main surface and a second main surface, the first main surface being a surface on which the first package is placed, the second main surface being positioned on a reverse side of the first main surface of the substrate, the trench has an opening portion in the second main surface, a depth of the trench from the second main surface is greater than half of a thickness of the substrate, the trench does not reach the first main surface, the substrate includes a conductor layer positioned near the first main surface and via which terminals of the first package and terminals of the second package are electrically connected, and the trench does not penetrate the conductor layer.