公开(公告)号：US20220013710A1

公开(公告)日：2022-01-13

申请号：US17486445

申请日：2021-09-27

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H01L41/08 ,  H01L41/053 ,  H01L41/18 ,  H04R17/00

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.

公开(公告)号：US20210266678A1

公开(公告)日：2021-08-26

申请号：US17314171

申请日：2021-05-07

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H04R17/00 ,  H01L41/047 ,  H01L41/083 ,  H01L41/193 ,  H04R1/06 ,  H04R7/06 ,  B32B7/12 ,  B32B27/20 ,  B32B27/30 ,  B32B3/04

Abstract: An object is to provide a laminated piezoelectric element capable of preventing a short circuit between adjacent piezoelectric films and an electroacoustic transducer using the laminated piezoelectric element. The object is solved by laminating a plurality of layers of piezoelectric films polarized in a thickness direction, in which a piezoelectric layer is interposed between two thin film electrodes, and causing polarization directions of the adjacent piezoelectric films to be opposite to each other.

公开(公告)号：US20180242087A1

公开(公告)日：2018-08-23

申请号：US15958150

申请日：2018-04-20

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H04R17/00 ,  H04R17/02 ,  H01L41/193 ,  H01L41/053

CPC classification number: H04R17/005 ,  B06B1/0603 ,  B06B1/0611 ,  G10K9/125 ,  G10K11/178 ,  G10K11/1785 ,  G10K2210/3212 ,  G10K2210/3226 ,  H01L41/053 ,  H01L41/193 ,  H04R3/02 ,  H04R17/025

Abstract: An electroacoustic transduction film including a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature, and thin film electrodes respectively laminated on both surfaces of the polymer composite piezoelectric body is included, and two or more of the electroacoustic transduction films are laminated, and a gap between the adjacent electroacoustic transduction films is less than or equal to 3 cm.

公开(公告)号：US20180109880A1

公开(公告)日：2018-04-19

申请号：US15841617

申请日：2017-12-14

Applicant: FUJIFILM Corporation

Inventor： Shin OZAWA ,  Daisuke INOUE ,  Tetsu MIYOSHI

IPC: H04R17/00 ,  H01L41/09 ,  H01L41/053

CPC classification number: H04R17/005 ,  H01L41/0533 ,  H01L41/09 ,  H04R7/04

Abstract: Provided are an electroacoustic transduction film and an electroacoustic transducer capable of reproducing a sound with a sufficient sound volume and preventing deterioration of appearance. The electroacoustic transduction film includes: a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature; a lower thin film electrode laminated on one principal surface of the polymer composite piezoelectric body; a lower protective layer laminated on the lower thin film electrode; an upper thin film electrode formed on the other principal surface of the polymer composite piezoelectric body; an upper protective layer laminated on the upper thin film electrode; and a colored layer laminated on at least one of a surface layer side of the upper thin film electrode and a surface layer side of the lower thin film electrode.

公开(公告)号：US20180069172A1

公开(公告)日：2018-03-08

申请号：US15808108

申请日：2017-11-09

Applicant: FUJIFILM Corporation

Inventor： Akihito FUKUNAGA ,  Tetsu MIYOSHI

IPC: H01L41/312 ,  H01L41/047 ,  H01L41/053 ,  H01L41/09 ,  H01L41/113 ,  H01L41/18 ,  H01L41/29 ,  H01L41/338 ,  H01L41/37 ,  H04R31/00 ,  H04R17/00 ,  B32B37/14 ,  B32B37/12 ,  B32B38/00 ,  B32B27/30

CPC classification number: H01L41/312 ,  B32B27/30 ,  B32B37/12 ,  B32B37/14 ,  B32B38/0004 ,  B32B2255/00 ,  B32B2305/72 ,  B32B2307/10 ,  B32B2309/105 ,  H01L41/047 ,  H01L41/0533 ,  H01L41/09 ,  H01L41/0973 ,  H01L41/113 ,  H01L41/1138 ,  H01L41/18 ,  H01L41/183 ,  H01L41/257 ,  H01L41/29 ,  H01L41/317 ,  H01L41/331 ,  H01L41/338 ,  H01L41/37 ,  H04R17/00 ,  H04R31/00

Abstract: Provided are an electroacoustic conversion film web, an electroacoustic conversion film, and manufacturing methods thereof in which costs can be reduced by reducing the number of operations without damage to thin film electrodes, the points of electrode lead-out portions can be freely determined, and thus high productivity can be achieved. A preparation step of preparing an electrode laminated body in which a single thin film electrode and a single protective layer are laminated and a lamination step of laminating the electrode laminated body and an piezoelectric layer are included. A non-adhered portion that is not adhered to the piezoelectric layer is provided in at least one end portion of the thin film electrode in a case where the electrode laminated body and the piezoelectric layer are laminated in the lamination step.

公开(公告)号：US20180014096A1

公开(公告)日：2018-01-11

申请号：US15701990

申请日：2017-09-12

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H04R1/02 ,  H04R7/24 ,  H04R1/40 ,  H04R1/26 ,  H01L41/08 ,  H04R17/00 ,  G10H3/14

CPC classification number: H04R1/02 ,  G10H3/143 ,  G10H3/146 ,  G10H2220/535 ,  G10H2220/541 ,  H01L41/0536 ,  H01L41/0805 ,  H01L41/098 ,  H01L41/183 ,  H04R1/26 ,  H04R1/32 ,  H04R1/40 ,  H04R7/24 ,  H04R17/005 ,  H04R17/025 ,  H04R2307/025 ,  H04R2400/01 ,  H04R2499/15

Abstract: An omnidirectional electroacoustic transducer capable of reproducing a sound with high acoustic quality and sufficient sound volume in a wide frequency band is provided with a small number of components. The electroacoustic transducer includes: two or more electroacoustic transduction units each including an electroacoustic transduction film and an elastic supporter, the electroacoustic transduction film having a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature, and two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body, and the elastic supporter being disposed to be closely attached to one principal surface of the electroacoustic transduction film so as to cause the electroacoustic transduction film to be bent, in which the two or more electroacoustic transduction units are disposed so that the electroacoustic transduction films face outward and form some or all of faces of a polyhedron.

公开(公告)号：US20140210309A1

公开(公告)日：2014-07-31

申请号：US14229606

申请日：2014-03-28

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H01L41/08

CPC classification number: H01L41/0805 ,  G02F2001/133394 ,  G10H3/143 ,  G10H3/146 ,  G10H2220/531 ,  G10H2220/545 ,  G10H2220/551 ,  H01L41/183 ,  H01L41/257 ,  H04R1/46 ,  H04R7/04 ,  H04R17/005 ,  H04R31/003 ,  H04R2307/025 ,  H04R2499/15

Abstract: Provided is an electroacoustic converter film including: a polymeric composite piezoelectric body having piezoelectric particles dispersed in a viscoelastic matrix which is formed of a polymer material exhibiting viscoelasticity at ordinary temperatures; thin film electrodes formed on both sides of the polymeric composite piezoelectric body; and protective layers formed on surfaces of the thin film electrodes. The electroacoustic converter film serves as a speaker capable of being integrated with a flexible display without impairing lightweightness or flexibility, and has considerable frequency dispersion in the storage modulus and also has a local maximum of the loss tangent around ordinary temperatures. A flexible display, a vocal cord microphone and a musical instrument sensor, in each of which the electroacoustic converter film is used, are also provided.

Abstract translation: 本发明提供一种电声转换膜，其特征在于，包括：聚合复合压电体，其具有分散在由常温下显示出粘弹性的聚合物材料的粘弹性基体中的压电体， 形成在聚合物复合压电体两侧的薄膜电极; 以及形成在薄膜电极的表面上的保护层。 电声转换膜用作能够与柔性显示器集成而不损害轻量化或柔性的扬声器，并且在储能模量方面具有相当大的频率分散，并且还具有常温附近的损耗角正切的局部最大值。 还提供了柔性显示器，声带麦克风和乐器传感器，其中每个都使用电声转换膜。

公开(公告)号：US20240260476A1

公开(公告)日：2024-08-01

申请号：US18595568

申请日：2024-03-05

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H10N30/50 ,  H10N30/072 ,  H10N30/85 ,  H10N30/88

CPC classification number: H10N30/50 ,  H10N30/072 ,  H10N30/85 ,  H10N30/883

Abstract: An object of the present invention is to provide a piezoelectric film and a laminated piezoelectric element, in which, in a piezoelectric film including electrode layers and protective layers on both surfaces of a piezoelectric layer containing piezoelectric particles in a matrix containing a polymer material, changes in mechanical properties and electrical properties due to a humidity of an external environment can be reduced. The piezoelectric film includes a piezoelectric layer containing piezoelectric particles in a matrix containing a polymer material, electrode layers provided on both surfaces of the piezoelectric layer, and a protective layer provided on a surface of the electrode layer opposite to the piezoelectric layer, in which the protective layer has a resin substrate and at least one inorganic layer provided on the resin substrate, and a water vapor transmission rate of the piezoelectric film is 1×10−4 g/(m2×day) or less.

公开(公告)号：US20230026623A1

公开(公告)日：2023-01-26

申请号：US17955610

申请日：2022-09-29

Applicant: FUJIFILM Corporation

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

IPC: H04R17/00 ,  H01L41/09 ,  H01L41/18 ,  H01L41/083 ,  H01L41/047 ,  H01L41/08

Abstract: Provided is a laminated piezoelectric element is formed by folding back and laminating a piezoelectric film having an electrode layer and a protective layer on both sides of a piezoelectric layer in which piezoelectric particles are dispersed in a matrix. In the laminated two layers of the piezoelectric film, in a case where a thickness of a central portion thereof is a center thickness and a position up to twice the center thickness in a direction from the folded side end part toward the center is the folded-back portion, there is a position at which the thickness is greater than the center thickness in the folded-back portion, and there is an air gap in the folded-back portion or the air gap is filled with a cementing agent. The laminated piezoelectric element is able to prevent peeling of the electrode layer and the like in the folded-back portion in the laminated piezoelectric element in which the piezoelectric film is folded back and laminated. An electroacoustic transducer uses the laminated piezoelectric element.

公开(公告)号：US20220013709A1

公开(公告)日：2022-01-13

申请号：US17486079

申请日：2021-09-27

Applicant: FUJIFILM Corporation

Inventor： Tetsu MIYOSHI

IPC: H01L41/08 ,  H01L41/053 ,  H01L41/18

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.