Patent ID: 11944999
Assignee: TDK CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  H | IPC B  H

Claim 0:
1. A vibration device, comprising:
a bimorph type piezoelectric element including a piezoelectric body in which a plurality of piezoelectric layers are laminated and form a first active region and a second active region, and having a first main surface and a second main surface facing each other; and
a vibration member bonded to the second main surface of the piezoelectric element,
wherein the first active region is disposed closer to the first main surface between the first and second main surfaces, and the second active region is disposed closer to the second main surface than the first active region between the first and second main surfaces and displaced in opposite directions to the first active region, and
when a force generated in the first active region is F1, a force generated in the second active region is F2, and a force by which the vibration member restrains the second active region is Fr, F2−F1≥Fr is satisfied.