Patent ID: 11910720
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 12:
13. A piezoelectric device, comprising:
a first substrate that includes a first surface on which a piezoelectric element and a first electrode coupled to the piezoelectric element are disposed;
a second substrate that includes a second surface on which a second electrode configured to be coupled to a control circuit is disposed;
a third substrate that is disposed between the first substrate and the second substrate, and includes a third surface bonded to the first surface and a fourth surface facing the second surface, wherein
the second substrate includes a first region in which the third substrate and the first substrate are stacked, and a second region that surrounds the first region at an outer side of the first region,
the third substrate has a through hole passing through from the third surface to the fourth surface, and a third electrode provided in the through hole and coupled to the first electrode, and
the second electrode is coupled to the third electrode and is electrically coupled to the first electrode via the third electrode; and

a tubular portion that protrudes in a stacking direction in which the third substrate and the first substrate are stacked is provided in the second region of the second substrate, and the second substrate and the third substrate are disposed in a tube of the tubular portion.