中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

28 records (took 0.031 seconds)

    Piezoelectric film, laminated piezoelectric element, and electroacoustic transducer
    22.
    发明授权
    Piezoelectric film, laminated piezoelectric element, and electroacoustic transducer 有权

    公开(公告)号：US11793078B2

    公开(公告)日：2023-10-17

    申请号：US17486445

    申请日：2021-09-27

    Applicant: FUJIFILM Corporation

    Inventor： Tetsu Miyoshi

    IPC: H04R17/00 ,  H10N30/00 ,  H10N30/85 ,  H10N30/88

    CPC classification number: H10N30/1051 ,  H04R17/005 ,  H10N30/852 ,  H10N30/883

    Abstract: An object is to provide a piezoelectric film that has excellent flexibility in a high temperature environment at higher than 50° C. and exhibits good flexibility even at room temperature, a laminated piezoelectric element in which the piezoelectric films are laminated, and an electroacoustic transducer using the piezoelectric film or the laminated piezoelectric element. The object is solved by the piezoelectric film including: a polymer-based piezoelectric composite material in which piezoelectric particles are dispersed in a matrix including a polymer material; and electrode layers provided on both surfaces of the polymer-based piezoelectric composite material, in which a loss tangent at a frequency of 1 Hz according to dynamic viscoelasticity measurement has a maximal value of greater than or equal to 0.1 existing in a temperature range of higher than 50° C. and lower than or equal to 150° C., and has a value of greater than or equal to 0.08 at 50° C.

    Piezoelectric film, laminated piezoelectric element, and electroacoustic transducer
    23.
    发明授权
    Piezoelectric film, laminated piezoelectric element, and electroacoustic transducer 有权

    公开(公告)号：US11778913B2

    公开(公告)日：2023-10-03

    申请号：US17486079

    申请日：2021-09-27

    Applicant: FUJIFILM Corporation

    Inventor： Tetsu Miyoshi

    IPC: H10N30/00 ,  H10N30/85 ,  H10N30/88

    CPC classification number: H10N30/1051 ,  H10N30/85 ,  H10N30/883

    Abstract: An object is to provide a piezoelectric film that has excellent flexibility in a sub-zero environment and exhibits the required flexibility even at room temperature, a laminated piezoelectric element in which the piezoelectric films are laminated, and an electroacoustic transducer using the piezoelectric film or the laminated piezoelectric element. The object is solved by the piezoelectric film including: a polymer-based piezoelectric composite material in which piezoelectric particles are dispersed in a matrix including a polymer material; and electrode layers formed on both surfaces of the polymer-based piezoelectric composite material, in which a loss tangent at a frequency of 1 Hz according to dynamic viscoelasticity measurement has a maximal value of greater than or equal to 0.1 existing in a temperature range of higher than or equal to −80° C. and lower than 0° C., and has a value of greater than or equal to 0.05 at 0° C.

    Electroacoustic transduction film and manufacturing method of electroacoustic transduction film
    25.
    发明授权
    Electroacoustic transduction film and manufacturing method of electroacoustic transduction film 有权

    公开(公告)号：US10038134B2

    公开(公告)日：2018-07-31

    申请号：US15663058

    申请日：2017-07-28

    Applicant: FUJIFILM Corporation

    Inventor： Daisuke Inoue ,  Tetsu Miyoshi

    IPC: H01L41/18 ,  H04R17/00 ,  H04R31/00 ,  H04R7/04 ,  H01L41/257 ,  H01L41/37

    CPC classification number: H01L41/183 ,  H01L41/047 ,  H01L41/193 ,  H01L41/257 ,  H01L41/37 ,  H04R7/04 ,  H04R17/005 ,  H04R17/025 ,  H04R31/003 ,  H04R2217/01 ,  H04R2307/025 ,  H04R2499/11

    Abstract: Provided are an electroacoustic transduction film in which conversion between a vibration and a voltage is able to be appropriately performed without the occurrence of dielectric breakdown of the air between upper and lower thin film electrodes even when a high voltage is applied therebetween, a user is able to be prevented from coming into contact with a piezoelectric layer, and high productivity is achieved, and a manufacturing method of an electroacoustic transduction film. A piezoelectric layer which stretches and contracts in response to a state of an electric field, an upper thin film electrode formed on one principal surface of the piezoelectric layer, a lower thin film electrode formed on the other principal surface of the piezoelectric layer, an upper protective layer formed on the upper thin film electrode, and a lower protective layer formed on the lower thin film electrode are included, and a groove which penetrates the thin film electrode and the protective layer is formed in at least a portion of an outer peripheral portion in a surface direction of at least one of the upper thin film electrode and the upper protective layer, or the lower thin film electrode and the lower protective layer.

Patent Agency Ranking