Patent ID: 8853546
Filing Date: 2014-10-07
Classification: C25D,H05K,Y10T

Abstract:
1. A printed circuit board comprising: a first insulating layer; a wiring trace formed on said first insulating layer; a terminal provided at a first portion of said wiring trace; a lead for plating formed on said first insulating layer to extend from said wiring trace; and a second insulating layer formed on said first insulating layer to cover said wiring trace and said lead for plating, wherein said second insulating layer has a first opening therein to expose the terminal of said wiring trace, at least one of said first and second insulating layers includes a first portion overlapping a second portion of said wiring trace and a second portion overlapping a portion of said lead for plating, neither the second portion of said wiring trace nor the portion of said lead for plating overlapping said first opening, and a thickness of said second portion of said first or second insulating layer is set smaller than a thickness of said first portion of said first or second insulating layer such that an effective dielectric constant of a region overlapping said lead for plating is set smaller than an effective dielectric constant of a region overlapping said wiring trace.