Patent ID: 9078343
Filing Date: 2015-07-07
Classification: H05K

Abstract:
1. A method for manufacturing a printed wiring board, comprising: preparing a core substrate; forming a penetrating hole in the core substrate; forming a first conductor on a first surface of the core substrate; forming a second conductor on a second surface of the core substrate on an opposite side of the first surface of the core substrate; and filling a conductive material in the penetrating hole such that a through-hole conductor is formed in the penetrating hole and the first conductor and the second conductor are connected via the through-hole conductor, wherein the forming of the penetrating hole comprises forming a first opening portion in the first surface of the core substrate, forming a second opening portion from a bottom portion of the first opening portion toward the second surface such that the second opening portion forms a first bent portion connected to the first opening portion and has a diameter which is smaller than a diameter of the first opening portion, forming a third opening portion in the second surface of the core substrate, and forming a fourth opening portion from a bottom portion of the third opening portion toward the first surface such that the fourth opening portion forms a second bent portion connected to the third opening portion and a third bend portion connected to the second opening portion and has a diameter which is smaller than a diameter of the third opening portion, the first opening portion inclines at an angle θ