| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the unnecessary radiation of a printed board without using any expensive noise preventive parts. SOLUTION: On the surface layer 110 of the printed board 100, a driver 40, a receiver 1, manual switches 50 and 60, a pattern A, and terminals V1A1, V1A2, V1A3, and V1A4, are provided. On one inner layer 1 (120) of the board 100, a pattern B and the terminals V1A1 and V1A3 are provided and, on the other inner layer 2 (130) of the printed board 100, a pattern C and the terminals V1A2 and V1A4 are provided. In this way, signal lines respectively having patterns A, B and C are provided as the originally required one signal line, and one pattern can be selected by switching the signal lines to each other by means of a manual switch. Consequently, the pattern corresponding to an unnecessary radiation suppressing frequency region can be selected.</p> |
