| 摘要 |
PROBLEM TO BE SOLVED: To restrain spurious radiation from a power supply wiring by arranging a plane-like ground wiring and a plane-like power supply wiring so that electric line of force generated between both wirings cancels each other. SOLUTION: A printed board 10 is a multilaytered printed board, and a signal wiring 30, an electric supply wiring 40 and ground wirings 51, 52 are therein. The power supply wiring 40 and the ground wirings 51, 52 from what is called a solid pattern having a plane shape spreading all over a board. Since a power supply voltage is applied between the power supply wiring 40 and a ground wiring 51 or 52, electric lines of force 71, 72 are generated. Here, the power supply wirting 40 and the ground wirings 51, 52 have the same configuration and are arranged to overlap mutually up and down. A distance between a power supply wiring and a ground wiring and a distance between a power supply wiring and a ground wiring are made the same. Since electric lines of force 71, 72 in to directions have the same size and direction thereof are different 180 deg., they cancel each other. |
