| 摘要 |
PROBLEM TO BE SOLVED: To realize high-speed electric signal transmission by shortening a common bus transmission line length on a backboard. SOLUTION: Printed circuit boards 101 to 103 at the surface of a backboard 120 are connected to the bus wiring on the backboard 120 by means of connectors 131a, b to 133a, b, while the printed circuit boards 104 to 106 at the rear surface of the backboard 120 are connected to the bus wiring on the backboard 120 by means of the connectors 134a, b to 136a, b. An interval between the printed circuit boards 101 to 106 is determined by the height of parts mounted on the printed circuit board. In this case, the total bush transmission line length of the bus wiring 120 can be markedly reduced than the total bus transmission line length, when 10 sheets of printed circuit board are mounted on the single surface of the backboard. |
