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

Claim 0:
1. 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, wherein the first substrate is provided with a plurality of the first electrodes;
a second substrate that includes a second surface on which a second electrode configured to be coupled to a control circuit is disposed, wherein the second substrate is provided with a plurality of the second electrodes corresponding to the plurality of the first electrodes;
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 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,
the third substrate is provided with a plurality of the through holes and a plurality of the third electrodes corresponding to the plurality of the first electrodes, and each one of the third electrodes is coupled to each one of the second electrodes, and
the second electrode is coupled to the third electrode and is electrically coupled to the first electrode via the third electrode; and

a wall portion that partitions between adjacent ones of the second electrodes is provided between the second substrate and the third substrate.