MULTILAYERED PRINTED WIRING BOARD AND ITS MANUFACTURE

摘要

PURPOSE:To form a plated layer of high reliability to thermal shock in a through-hole part of a multilayered printed wiring board. CONSTITUTION:In the cross-section of a through-hole part of a multilayered printed wiring board, ends of respective layers 2-4 which constitute the wiring board form unevenness and are overlaid with smoothing copper plated layers 1. Because of a high coefficient of thermal expansion, thickening the plating of an adhesive layer 2 susceptable to cracks of a plated layer improves reliability to thermal shock.