Patent ID: 11962284
Assignee: KYOCERA CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A composite substrate comprising:
a plate-shaped body including a first substrate and a second substrate, wherein the first substrate and the second substrate overlap;
a hole in the first substrate and the second substrate in a thickness direction of the plateshaped body;
wherein a ratio A/B of an average thickness A of the first substrate to an average thickness B of the second substrate is ⅕ or less;
wherein an interface between the first substrate and the second substrate on an inner wall of the plate-shaped body that is positioned at the hole includes a part that is covered by a covering layer that contains a component that composes the second substrate; and
wherein a surface roughness of an inner wall of the first substrate is greater than a surface roughness of an inner wall of the second substrate.