| 摘要 |
PROBLEM TO BE SOLVED: To prevent malfunction of electronic parts caused by noise getting in the parts. SOLUTION: A wiring board is composed of an insulating substrate 3 having a mounting section 3a for mounting electronic parts 7 on its surface and signal lines 4, a power supply line 5, and a ground line 6 which are formed on and in the substrate 3 and electrically connected to the signal electrode, a power supply electrode, and a ground electrode of the parts 7. The substrate 3 is formed of SiO2 -Al2 O3 -MgO-ZnO-B2 O3 crystalline glass and, at the same time, at least one auxiliary ground line 6a is diverged from the ground line 6 so that the signal lines 4 may be held between the ground lines 6 and 6a and a magnetic area is formed by adding magnetic powder to at least part of the ground line 6a. |
