| 摘要 |
PURPOSE:To reduce a designing scale by half and to reduce designing period, cost by wiring a signal line pattern except a common bus and a signal line pattern of the bus as separate back wiring boards. CONSTITUTION:A female connector 5 of a printed wiring substrate side is mounted on a printed wiring substrate 3. A common bus separate type back wiring board 1, the substrate 3 and a common bus separate type back wiring board 2, the substrate 3 are respectively connected by a male connector 6 of the back wiring board side and the connector 5 of the board side. It is so designed that the signal line of the common bus of signal lines extended externally through the connector 5 from the substrate 3 is wired on the board 1 and the signal line except the common bus is wired on the board 2. |
