| 摘要 |
PURPOSE:To evaluate the copper patterns of inner layers of a printed board and easily check of they are laminated in the correct order. CONSTITUTION:Through-hole lands 1, 2, 3, and 4 are provided to a non-mount region, and through-holes 1B, 2B, 3B, and 4A are provided. Copper foil patterns 1A, 2A, 3A, and ' are formed in a staggered manner, By this constitution, it can be easily judged that a printed board is defective or not. |
