| 摘要 |
PROBLEM TO BE SOLVED: To avoid electric-short circuiting or large reduction in insulation resistance between adjacent wiring conductor layers. SOLUTION: A ceramic green sheet 1 is made by adding and mixing a coloring agent of Mo oxide powder having an aspect ratio of 3 or less and mean grain size of 4μm or less, an org. solvent and a solvent to a ceramic powder and sheeting the mixture. The green sheet 1 is baked in a reducing atmosphere to form a black ceramic insulation board 1a, and a wiring conductor layer 2a is formed thereon, wherein exposing a thin and long metal Mo of several tens of microns long on the insulation board 1a surface can be avoided. Consequently electrical short-circuiting or large reduction in insulation resistance between adjacent wiring conductor layers 2a can be prevented.
|
