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

Claim 1:
2. A composite substrate comprising:
a plate-shaped body including a first substrate made of a first material, the first substrate having a first surface and a second surface;
a second substrate made of a second material, the second substrate having a first surface and a second surface, where the first substrate and the second substrate overlap and the second surface of the first substrate faces the first surface of the second substrate;
a hole extending in a thickness direction through the plate-shaped body from a first opening in the first surface of the first substrate to a second opening in the second surface of the second substrate;
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;
an interface between the second surface of the first substrate and the first surface of the second substrate positioned in the hole, the hole having a uniform diameter at the interface;
a covering layer positioned to cover the interface in the hole;
wherein the covering layer is made of the second material.