| 摘要 |
PURPOSE:To stabilize an electric connection of a via-hole and to improve its reliability by filling conductive paste in a through hole formed by coating the inner periphery of the through hole of a green sheet with the paste, and forming the via-hole. CONSTITUTION:A through hole 2 made in the perpendicular direction of a green sheet 1 from its front to its rear is formed at a predetermined position of the sheet 1, conductive paste 3 printed to coat the front face of the sheet 1 is sucked with a strong force from its rear face to coat the inner periphery of the hole 2 with the paste 3, and the through hole is formed. Then, when conductive paste 4 is filled in the through hole, dried and cured, a via-hole is obtained. The via-hole has recesses 5, 5 at the side ends of the hole 3 at the side of opening, and since the volume of the conductive paste filled therein is small, the sizes of the recesses 5, 5 are largely reduced. Thus, an electrically stable connection is obtained, and its reliability can be improved. |
