Patent ID: 11950360
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A ceramic substrate comprising: a substrate comprising a ceramic layer laminated on a shrinkage suppressing layer, the substrate having a bottom portion with a mounting surface on the ceramic layer, the shrinkage suppressing layer being located on a lower surface of the ceramic layer opposite the mounting surface and having a higher content rate of a plate-shaped ceramic filling member than a content rate of the plate-shaped ceramic filling member in the ceramic layer, and where the ceramic layer and the shrinkage suppressing layer are co-sintered layers; and a wall portion on the bottom portion of the substrate and surrounding the mounting surface, wherein the wall portion includes at least the ceramic layer, and an orientation of a grain boundary indicating an interlayer between the ceramic layer and the shrinkage suppressing layer is curved along the mounting surface and an inner wall of the wall portion.