Patent ID: 6512185
Filing Date: 2003-01-28
Classification: H01R,H05K

Abstract:
A printed-wiring board, including a wiring pattern and land portions which are formed on a component side having electric components thereon and a soldering side of the board respectively, both of said land portions being connected with each other through an electrically conducting layer formed on an inside peripheral surface of a hole bored through said board, said electric component being soldered with lead-free solder, and said wiring pattern being covered with an insulating layer, wherein a surface of one of said land portions on said component side is covered with said insulating layer, a surface of another one of said land portions on said soldering side is not covered with said insulating layer and, when a lead of one electrical component is soldered in the hole, the solder forms electrical contact along an entire length of electrically conducting layer and with the uncovered surface of the one land portion on said soldering side while the solder is prevented from forming electrical contact with the covered surface of the one land portion on said component side as a result of being covered with said insulating layer.