| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electronic apparatus superior in noise resistance. SOLUTION: A printed wiring board 7 in an electronic apparatus for vehicles comprises through-hole lands Rg connected to a ground potential through electric wires Lg extending from other printed wiring boards and connecting copper foils 10, 20 connected to the ground potential through the frame of the electronic apparatus. On the board 7 the top end of a ground pattern Pg1 (Pg1-a, Pg1-b) laid with an origin at the through-hole lands Rg is connected through resistors 8, 9 of several to several tens ohms to ground patterns Pg2-a, Pg2-b laid with origins at the foils 10, 20. The ground pattern Pg1 is set to be a main ground pattern of electronic circuits. The board 7 can suppress a high frequency current by the resistors 8, 9 from flowing between the ground patterns Pg1, Pg2-a, Pg2-b due to high frequency noises.</p> |
