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    Piezoelectric device including base portion and membrane portion
    1.
    发明授权
    Piezoelectric device including base portion and membrane portion 有权

    公开(公告)号：US12185636B2

    公开(公告)日：2024-12-31

    申请号：US17506921

    申请日：2021-10-21

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Masayuki Suzuki ,  Shinsuke Ikeuchi ,  Fumiya Kurokawa ,  Yutaka Kishimoto

    IPC: H10N30/87 ,  H10N30/00

    Abstract: A piezoelectric device includes a membrane portion including a single-crystal piezoelectric layer, an upper electrode layer, and a lower electrode layer. The upper electrode layer is on a first surface. The lower electrode layer is on a second surface facing at least a portion of the upper electrode layer sandwiching the single-crystal piezoelectric layer. The single-crystal piezoelectric layer includes piezoelectric body cleavage directions extending along a boundary line between a cleavage plane occurring when the single-crystal piezoelectric layer is cleaved and the first surface. When viewed in a vertical direction, at least a portion of an upper electrode outer edge and at least a portion of a lower electrode outer edge are non-parallel to at least one of the piezoelectric body cleavage directions.

    Ultrasonic transducer
    2.
    发明授权
    Ultrasonic transducer 有权

    公开(公告)号：US12138658B2

    公开(公告)日：2024-11-12

    申请号：US17894217

    申请日：2022-08-24

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Fumiya Kurokawa ,  Yasuhiro Aida ,  Shinsuke Ikeuchi ,  Seiji Umezawa ,  Masayuki Suzuki

    IPC: B06B1/02 ,  G10K11/02

    Abstract: An ultrasonic transducer includes first and second acoustic transducers and a housing with a bottomed tubular shape. The second acoustic transducer includes an annular section supporting a second membrane section and contacting an entire periphery of the second membrane section, and an acoustic matching plate facing the second membrane section and spaced apart from the second membrane section. The acoustic matching plate is connected to a surrounding wall portion defining a sealed space with the housing. An ultrasonic transmission path sandwiched between the first membrane section and the second membrane section is provided in the sealed space. A maximum inner width of the ultrasonic transmission path is smaller than a maximum inner width of the surrounding wall portion.

    PIEZOELECTRIC DEVICE
    4.
    发明申请
    PIEZOELECTRIC DEVICE 有权

    公开(公告)号：US20220241817A1

    公开(公告)日：2022-08-04

    申请号：US17724523

    申请日：2022-04-20

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Shinsuke Ikeuchi ,  Seiji Umezawa ,  Fumiya Kurokawa ,  Masayuki Suzuki

    IPC: B06B1/06 ,  H01L41/053 ,  H01L41/113 ,  H01L41/187

    Abstract: A piezoelectric device includes an outer base, a protruding base, and only one cantilevered portion. A protruding base includes a protrusion and a tip portion. The protrusion protrudes from an internal circumferential surface of the outer base toward a center of a ring shape. The tip portion is connected to the protrusion and located at the center. The cantilevered portion is connected to the tip portion, and extends while being spaced apart from the protrusion. The cantilevered portion includes a fixed end portion and a free periphery. The fixed end portion is connected to the tip portion. The free periphery is located along the internal circumferential surface. The protrusion is located between a first end and a second end of the free periphery.

    Piezoelectric device
    6.
    发明授权
    Piezoelectric device 有权

    公开(公告)号：US11605775B2

    公开(公告)日：2023-03-14

    申请号：US16907400

    申请日：2020-06-22

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Yutaka Kishimoto ,  Shinsuke Ikeuchi ,  Masayuki Suzuki ,  Fumiya Kurokawa

    IPC: H01L41/083 ,  H01L41/047 ,  H01L41/18

    Abstract: In a piezoelectric device, electrode layers are spaced apart from each other in the direction of the normal thereto. A first piezoelectric layer is interposed between two electrode layers of electrode layers in the direction of the normal. A second piezoelectric layer is provided on an opposite side of the first piezoelectric layer from a base portion. The second piezoelectric layer is interposed between two electrode layers of the electrode layers in the direction of the normal. The half-width of a rocking curve measured by X-ray diffraction for a lattice plane of the first piezoelectric layer substantially parallel to a first main surface is smaller than a half-width for the second piezoelectric layer. The piezoelectric constant of a material defining the first piezoelectric layer is smaller than the piezoelectric constant of a material defining the second piezoelectric layer.

    Piezoelectric device
    7.
    发明授权
    Piezoelectric device 有权

    公开(公告)号：US11979713B2

    公开(公告)日：2024-05-07

    申请号：US17853979

    申请日：2022-06-30

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Seiji Umezawa ,  Matti Liukku ,  Ville-Pekka Rytkönen ,  Anssi Blomqvist ,  Shinsuke Ikeuchi ,  Fumiya Kurokawa ,  Masayuki Suzuki

    IPC: H04R17/02 ,  H10N30/853

    CPC classification number: H04R17/02 ,  H10N30/8542

    Abstract: A piezoelectric device includes a connecting section connecting a pair of beam sections adjacent to each other. The connecting section is connected to one of the pair of beam sections at a first end portion. The connecting section is connected to another of the pair of beam sections at a second end portion. The second end portion faces the first end portion in a direction in which the pair of beam sections are aligned. A second coupling portion is located along a first coupling portion. The connecting section includes only one first end portion. The connecting section includes only one second end portion. Each of the first end portion and the second end portion is closer to a tip end portion than to a fixed end portion of each of the pair of beam sections.

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