US 12,343,760 B2
Piezoelectric device
Shinsuke Ikeuchi, Nagaokakyo (JP); Seiji Umezawa, Nagaokakyo (JP); Fumiya Kurokawa, Nagaokakyo (JP); and Masayuki Suzuki, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Apr. 20, 2022, as Appl. No. 17/724,523.
Application 17/724,523 is a continuation of application No. PCT/JP2020/028652, filed on Jul. 27, 2020.
Claims priority of application No. 2019-210740 (JP), filed on Nov. 21, 2019.
Prior Publication US 2022/0241817 A1, Aug. 4, 2022
Int. Cl. B06B 1/06 (2006.01); H10N 30/30 (2023.01); H10N 30/853 (2023.01); H10N 30/88 (2023.01)
CPC B06B 1/0603 (2013.01) [H10N 30/306 (2023.02); H10N 30/8542 (2023.02); H10N 30/88 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A piezoelectric device, comprising:
an outer base that has a ring shape and includes an internal circumferential surface;
a protruding base that includes a protrusion and a tip portion, the protrusion protruding from the internal circumferential surface of the outer base toward a center of the ring shape, the tip portion being connected to the protrusion and located at the center; and
only one cantilevered portion that is connected to the tip portion, and extends while being spaced apart from the protrusion; wherein
the cantilevered portion includes a piezoelectric layer, a first electrode layer located on one side of the piezoelectric layer, and a second electrode layer opposing at least a portion of the first electrode layer with the piezoelectric layer interposed therebetween;
the cantilevered portion includes a fixed end portion connected to the tip portion and a free periphery located along the internal circumferential surface; and
the protrusion is located between a first end and a second end of the free periphery.