Patent ID: 7378049
Filing Date: 2008-05-27
Classification: B32B,C04B,H01L,H05K

Abstract:
1. A method for producing a ceramic substrate having first convex portions composed of a conductive thick film material and second convex portions composed of an insulating thick film material on a surface, comprising: a first process of providing first holes for the first convex portions and second holes for the second convex portions at a distance of 50 μm or more in a first unbaked sheet and providing third holes in a second unbaked sheet; a second process of filling the first holes with a conductive paste and the second and third holes with an insulating paste after the first process; a third process of laminating the first unbaked sheet filled with the conductive paste and the insulating paste on an outermost layer of a sintered ceramic substrate, and further laminating the second unbaked sheet filled with the insulating paste on the first unbaked sheet with the second and third holes aligned followed by pressing, thereby forming a laminate, after the second process; a fourth process of sintering the laminate after the third process; and a fifth process of removing the unbaked sheets after the fourth process.