Patent ID: 11938731
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 substrate having a recessed portion;
a diaphragm; and
a piezoelectric actuator includes a first electrode, a piezoelectric layer, and a second electrode that are laminated in this order in a first direction, wherein
the substrate, the diaphragm, and the piezoelectric actuator are laminated in this order in the first direction,
the diaphragm includes
a first layer containing silicon as a constituent element,
a second layer disposed between the first layer and the piezoelectric actuator, and containing any one or both of at least one metal element selected from the group made of chromium, titanium, aluminum, tantalum, hafnium, and iridium, and silicon nitride, as a constituent element, and
a third layer disposed between the second layer and the piezoelectric actuator and containing zirconium as a constituent element, and
a fourth layer is provided, and the fourth layer containing any one or both of at least one metal element selected from the group made of chromium, titanium, aluminum, tantalum, hafnium, and iridium, and silicon nitride, as a constituent element, on the third layer on a piezoelectric actuator side,
the fourth layer being disposed between the second electrode and the piezoelectric layer when viewed in a direction orthogonal to the first direction.