| 摘要 |
PURPOSE:To provide a printed circuit board in which a characteristic impedance value, similarly to a case where wiring patterns are superposed through an insulating layer like a printed circuit board of a product region, can be obtained by an inspecting region in the board. CONSTITUTION:In a printed circuit board which has patterns 4A, 4B, 4C for measuring a characteristic impedance, and in which insulating layers 5A, 5B, 5C provided with wiring patterns are laminated in a multilayer structure, a dummy conductor layer pattern 21 is so provided as to superpose the patterns 4A, 4B, 4C on the patterns 4A, 4B, 4C through the layers 5A, 5B. |
