Patent ID: 8492659
Filing Date: 2013-07-23
Classification: H05K,Y10T

Abstract:
1. A printed wiring board comprising: an insulation layer having a blind hole; a conductor layer provided on the insulation layer; a wiring layer which is electrically connected to the conductor layer via the blind hole; and a plated film formed within the blind hole which electrically connects the conductor layer with the wiring layer, is provided so as to be exposed from the blind hole, and prevents the wiring layer from being exposed from the blind hole, wherein the insulation layer has a first inner wall part contacting with the wiring layer and a second inner wall part contacting with the conductor layer, a second taper angle, measured from a line extending normal to a top surface of the wiring layer to a first part of a portion of the second inner wall part contacting with the conductor layer is larger than a first taper angle measured from the line extending normal to the top surface of the wiring layer to the first inner wall part, and a second part of the portion of the second inner wall part contacting with the conductor layer forms a concave surface in a direction towards the blind hole.