| 摘要 |
<p>PURPOSE:To eliminate the need to mount discrete resistors and to reduce the manhour of assembly by a method wherein printed wirings, each having are resistance value different from the others, are formed in the internal layer of a printed board in a multilayer and the printed wirings, each having a resistance value different from the others, are respectively combined and connected. CONSTITUTION:A transmission side IC 4 an a reception side IC 5 are mounted on a multilayer printed board 10 consisting of printed wirings 1 and 2 which have respectively a prescribed resistance value, insulating layers 8 and 9 and a normal mod layer 3 and output 41 of the IC 4 is connected with a resistor 21 of the wiring 2 having the prescribed resistance value, passes through to the layer 3 through a through hole 61, is connected to a normal mode layer 71 and moreover, is connected to input 51 of the IC 5. Combinations of the remaining 7 groups are also connected in the same way and are buried in an internal layer 70. Thereby, mounting of discrete resistors becomes unnecessary.</p> |
