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    PIEZOELECTRIC FILM
    1.
    发明公开
    PIEZOELECTRIC FILM 审中-公开

    公开(公告)号：EP4319197A1

    公开(公告)日：2024-02-07

    申请号：EP22774991.8

    申请日：2022-03-03

    Applicant: FUJIFILM Corporation

    Inventor： ISHIDA Jumpei

    IPC: H04R17/00 ,  H01L41/083 ,  H01L41/09 ,  H01L41/18

    Abstract: Provided is a piezoelectric film having high piezoelectric performance. The piezoelectric film is a piezoelectric film including a piezoelectric layer consisting of a polymer-based piezoelectric composite material that contains piezoelectric particles in a matrix containing a polymer material, and electrode layers formed on both surfaces of the piezoelectric layer, in which the piezoelectric particles observed in a cross section of the piezoelectric layer in a thickness direction have a circularity of 0.65 to 0.92.

    PIEZOELECTRIC FILM
    6.
    发明公开
    PIEZOELECTRIC FILM 审中-公开

    公开(公告)号：EP4102857A1

    公开(公告)日：2022-12-14

    申请号：EP21751010.6

    申请日：2021-01-12

    Applicant: FUJIFILM Corporation

    Inventor： TAMADA, Yoshinori

    IPC: H04R17/00 ,  H01L41/09 ,  H01L41/18 ,  H01L41/257 ,  H01L41/313 ,  H01L41/317

    Abstract: An object of the present invention is to provide a piezoelectric film capable of realizing an electroacoustic conversion film or the like in which the durability is high and a sufficient sound pressure with respect to an input operating voltage is obtained. The object is achieved by providing a piezoelectric film including a polymer-based piezoelectric composite material which contains piezoelectric particles in a matrix containing a polymer material, and electrode layers which are provided on both surfaces of the polymer-based piezoelectric composite material, in which in a case where a cross section of the film in a thickness direction is observed with a scanning electron microscope, the polymer-based piezoelectric composite material is divided into ten equal regions in the thickness direction, area ratios of the piezoelectric particles in two most distant regions are measured, and the area ratio of the piezoelectric particles in the region with a lower area ratio is set as 1, the area ratio of the piezoelectric particles in the region with a higher area ratio is 1.2 or greater.

    PIEZOELECTRIC COMPOSITE FILAMENTS AND USE THEREOF IN ADDITIVE MANUFACTURING
    7.
    发明公开
    PIEZOELECTRIC COMPOSITE FILAMENTS AND USE THEREOF IN ADDITIVE MANUFACTURING 审中-公开

    公开(公告)号：EP4064373A2

    公开(公告)日：2022-09-28

    申请号：EP22160120.6

    申请日：2022-03-04

    Applicant: Xerox Corporation

    Inventor： VELLA, Sarah J ,  ZHU, Yujie

    IPC: H01L41/18 ,  H01L41/187 ,  H01L41/193

    Abstract: Parts made by additive manufacturing are often structural in nature, rather than having functional properties conveyed by a polymer or other component. Printed parts having piezoelectric properties may be formed using a composite filament comprising a plurality of piezoelectric particles dispersed in a thermoplastic polymer. The composite filaments may be formed through melt blending and extrusion. The composite filament is compatible with fused filament fabrication and has a length and diameter compatible with fused filament fabrication, and the piezoelectric particles are substantially non-agglomerated and dispersed along the length of the composite filament. The piezoelectric particles may remain substantially non-agglomerated when dispersed in the thermoplastic polymer through melt blending. Additive manufacturing processes may comprise heating such a composite filament at or above a melting point or softening temperature thereof to form a softened composite material, and depositing the softened composite material layer by layer to form a printed part.

    LAMINATED PIEZOELECTRIC ELEMENT
    8.
    发明公开
    LAMINATED PIEZOELECTRIC ELEMENT 审中-公开

    公开(公告)号：EP4061010A1

    公开(公告)日：2022-09-21

    申请号：EP20887314.1

    申请日：2020-10-29

    Applicant: FUJIFILM Corporation

    Inventor： KAGAWA, Yusuke ,  ASHIKAWA, Teruo ,  HIRAGUCHI, Kazuo

    IPC: H04R17/00 ,  H01L41/047 ,  H01L41/083 ,  H01L41/09 ,  H01L41/18

    Abstract: An object of the present invention is to provide a laminated piezoelectric element in which piezoelectric films are laminated, capable of easily performing connection of an electrode layer of each piezoelectric film and an external device. The piezoelectric film includes a piezoelectric layer and a laminated sheet in which an electrode layer and a protective layer are laminated, piezoelectric layers are arranged between the laminated sheets facing the electrode layer, the laminated sheet includes a protruding portion protruding from the piezoelectric layer, the protruding portion is provided with a lead-out wire attached to a surface between the electrode layer and the protective layer, and the object is achieved by contacting the lead-out wire and connecting electrode layers having a same polarity of each piezoelectric film.

    PIEZOELECTRIC FILM
    10.
    发明公开
    PIEZOELECTRIC FILM 审中-公开

    公开(公告)号：EP3993439A1

    公开(公告)日：2022-05-04

    申请号：EP20833055.5

    申请日：2020-05-29

    Applicant: FUJIFILM Corporation

    Inventor： TAMADA, Yoshinori

    IPC: H04R7/20 ,  H04R17/00 ,  H01L41/047 ,  H01L41/09 ,  H01L41/18 ,  H01L41/43

    Abstract: Provided is a piezoelectric film capable of realizing an electroacoustic conversion film or the like in which the durability is high and a sufficient sound pressure with respect to an input operating voltage is obtained. The piezoelectric film is a piezoelectric film including a polymer-based piezoelectric composite material which contains piezoelectric particles in a matrix containing a polymer material, and electrode layers which are provided on both surfaces of the polymer-based piezoelectric composite material, in which in a case where a cross section of the piezoelectric film in a thickness direction is observed with a scanning electron microscope, the polymer-based piezoelectric composite material is divided into two equal regions in the thickness direction, and void volumes of the two regions are measured, a ratio of the void volume obtained by dividing the void volume of the region with a larger void volume by the void volume of the region with a smaller void volume is 1.2 or greater.

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