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    MULTILAYER PIEZOELECTRIC ELEMENT
    2.
    发明申请
    MULTILAYER PIEZOELECTRIC ELEMENT 审中-公开

    公开(公告)号：US20200243745A1

    公开(公告)日：2020-07-30

    申请号：US16776754

    申请日：2020-01-30

    Applicant: TDK CORPORATION

    Inventor： Makoto ISHIZAKI ,  Masaharu HIRAKAWA

    IPC: H01L41/047 ,  H01L41/083

    Abstract: A multilayer piezoelectric element includes a laminated body and a lateral electrode. The laminated body includes a piezoelectric layer, an internal electrode layer, and a dummy electrode layer. The piezoelectric layer is formed along a plane including a first axis and a second axis perpendicular to each other. The internal electrode layer and the dummy electrode layer are laminated on the piezoelectric layer. The lateral electrode is formed on a lateral surface of the laminated body perpendicular to the first axis. The internal electrode layer has a leading portion exposed to the lateral surface of the laminated body and is electrically connected with the lateral electrode via the leading portion. The dummy electrode layer is formed on the plane to surround the internal electrode layer excluding the leading portion with a gap therebetween. A slit is formed at least at one or more positions of the dummy electrode layer.

    MULTILAYER PIEZOELECTRIC DEVICE
    3.
    发明申请
    MULTILAYER PIEZOELECTRIC DEVICE 有权

    公开(公告)号：US20210104658A1

    公开(公告)日：2021-04-08

    申请号：US17064951

    申请日：2020-10-07

    Applicant: TDK CORPORATION

    Inventor： Makoto ISHIZAKI ,  Masaharu HIRAKAWA

    IPC: H01L41/312 ,  H01L41/083 ,  H01L41/047

    Abstract: A multilayer piezoelectric device includes a laminated body and an external electrode. The laminated body includes a piezoelectric layer formed along a plane including a first axis and a second axis intersecting each other and an internal electrode layer laminated on the piezoelectric layer. The external electrode is electrically connected to the internal electrode layer. The internal electrode layer includes a first slit parallel to the first axis and a second slit parallel to the second axis.

    MULTILAYER PIEZOELECTRIC ELEMENT
    4.
    发明申请
    MULTILAYER PIEZOELECTRIC ELEMENT 审中-公开

    公开(公告)号：US20200313067A1

    公开(公告)日：2020-10-01

    申请号：US16830374

    申请日：2020-03-26

    Applicant: TDK CORPORATION

    Inventor： Makoto ISHIZAKI ,  Masaharu HIRAKAWA

    IPC: H01L41/083 ,  H01L41/047 ,  H01L41/297 ,  H01L41/273

    Abstract: A multilayer piezoelectric element includes a laminated body and a lateral electrode. The laminated body includes a piezoelectric layer and an internal electrode layer. The piezoelectric layer is formed along a plane including a first axis and a second axis perpendicular to each other. The internal electrode layer is laminated on the piezoelectric layer. The internal electrode layer has a leading portion exposed to the lateral surface of the laminated body and is electrically connected with the lateral electrode via the leading portion. A dummy electrode layer is formed with a gap to surround the internal electrode layer excluding the leading portion on the plane of the piezoelectric layer. The dummy electrode layer is composed of a material whose thermal shrinkage start temperature is higher than that of a conductive metal constituting the internal electrode layer.

    PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC DEVICE
    5.
    发明申请
    PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC DEVICE 审中-公开

    公开(公告)号：US20180261758A1

    公开(公告)日：2018-09-13

    申请号：US15914093

    申请日：2018-03-07

    Applicant: TDK CORPORATION

    Inventor： Masashi KITAZAKI ,  Keisuke TERANISHI ,  Makoto ISHIZAKI

    IPC: H01L41/187 ,  H01L41/43 ,  C04B35/475 ,  C04B35/626 ,  C04B35/628 ,  C04B35/64

    Abstract: A piezoelectric composition comprises a plurality of crystal particles, wherein the piezoelectric composition includes bismuth, iron, barium, titanium, and oxygen; the crystal particles include a core and a shell covering the core; the average value of the contents of bismuth in the cores is expressed as CCORE % by mass, the average value of the contents of bismuth in the shells is expressed as CSHELL % by mass, and the CCORE is lower than the CSHELL; and the number of all the particles comprised in the piezoelectric composition is expressed as N, the number of the crystal particles including the core and the shell is expressed as n, and n/N is 0.10 to 1.00.

    MULTILAYER PIEZOELECTRIC ELEMENT
    6.
    发明申请
    MULTILAYER PIEZOELECTRIC ELEMENT 审中-公开

    公开(公告)号：US20200313069A1

    公开(公告)日：2020-10-01

    申请号：US16829010

    申请日：2020-03-25

    Applicant: TDK CORPORATION

    Inventor： Makoto ISHIZAKI ,  Masaharu HIRAKAWA

    IPC: H01L41/083 ,  H01L41/047 ,  H01L41/273

    Abstract: A multilayer piezoelectric element includes a laminated body and a lateral electrode. The laminated body includes a piezoelectric layer and an internal electrode layer. The piezoelectric layer is formed along a plane including a first axis and a second axis perpendicular to each other. The internal electrode layer is laminated on the piezoelectric layer. The internal electrode layer has a leading portion exposed to the lateral surface of the laminated body and is electrically connected with the lateral electrode via the leading portion. Ro is higher than Rc in the the laminated body. Ro is an existence rate of outer circumferential pores existing in the piezoelectric layer located in an outer circumferential part of the internal electrode layer. Rc is an existence rate of central pores existing in a central part of the laminated body.

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