公开(公告)号：US20180209838A1

公开(公告)日：2018-07-26

申请号：US15907783

申请日：2018-02-28

申请人： YAMAHA CORPORATION ,  YUPO CORPORATION

发明人： Tomoya MIYATA ,  Kunio HIYAMA ,  Seiichiro IIDA ,  Hiroshi KOIKE ,  Hidekazu KODAMA

IPC分类号： G01H11/08 ,  G10H3/14 ,  H01L41/053 ,  H01L41/113 ,  H01L41/193

摘要： A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

公开(公告)号：US20200309592A1

公开(公告)日：2020-10-01

申请号：US16888033

申请日：2020-05-29

申请人： YAMAHA CORPORATION ,  YUPO CORPORATION

发明人： Tomoya MIYATA ,  Kunio HIYAMA ,  Seiichiro IIDA ,  Hiroshi KOIKE ,  Hidekazu KODAMA

IPC分类号： G01H11/08 ,  H01L41/193 ,  H01L41/053 ,  H01L41/113 ,  G10H3/14

摘要： A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

公开(公告)号：US20210289287A1

公开(公告)日：2021-09-16

申请号：US17333741

申请日：2021-05-28

申请人： Yamaha Corporation

发明人： Yu TSUCHIHASHI ,  Tomoya MIYATA

IPC分类号： H04R1/28

摘要： A electroacoustic transducer includes a housing, a piezoelectric element, a partition wall, a first tube, and a second tube. The piezoelectric element is disposed in the housing and includes a porous film and a pair of electrodes that sandwich the porous film therebetween. The partition wall divides an inner space of the housing into a first space closer to one of the pair of electrodes, and a second space closer to another of the pair of electrodes. The first tube establishes communication between a sound wave emission opening that is open to an outer space of the housing and the first space. The second tube establishes communication between the sound wave emission opening and the second space.

公开(公告)号：US20190251932A1

公开(公告)日：2019-08-15

申请号：US16394770

申请日：2019-04-25

申请人： Yamaha Corporation

发明人： Asumi MATSUDA ,  Tomoya MIYATA ,  Kazuyuki KOBAYASHI

IPC分类号： G10D3/06

CPC分类号： G10D3/06 ,  B27M3/00 ,  B32B21/08 ,  B32B21/10 ,  B32B27/08 ,  B32B27/12 ,  B32B2250/40 ,  B32B2307/554 ,  G10C3/06 ,  G10D1/02 ,  G10D1/08 ,  G10D3/02

摘要： The board for a musical instrument according to the present disclosure includes: a first base layer; and a pair of first reinforcement layers laminated on both face sides of the first base layer, in which the first reinforcement layers includes a fiber and a binder, and the fiber is a polyparaphenylenebenzobisoxazole fiber, a liquid crystal polyester fiber, an aramid fiber, a polyarylate fiber, an ultra high-molecular weight polyethylene fiber, a polyethylene naphthalate fiber or a glass fiber.

公开(公告)号：US20200245074A1

公开(公告)日：2020-07-30

申请号：US16851967

申请日：2020-04-17

申请人： Yamaha Corporation

发明人： Yu TSUCHIHASHI ,  Tomoya MIYATA

IPC分类号： H04R17/00 ,  H04R1/10

摘要： A transducer includes a hollow housing, and a piezoelectric sheet which is disposed on a first portion of an inner wall of the housing, and a block which is disposed on a second portion of the inner wall of the housing.

公开(公告)号：US20200154213A1

公开(公告)日：2020-05-14

申请号：US16739833

申请日：2020-01-10

申请人： Yamaha Corporation

发明人： Tomoya MIYATA ,  Akira MIKI ,  Yu TSUCHIHASHI

IPC分类号： H04R17/00 ,  H01L41/053 ,  H01L41/047

摘要： A transducer includes a housing, and a piezoelectric element that is disposed inside the housing and that has a porous film. The piezoelectric element is bent or curved.

公开(公告)号：US20220127442A1

公开(公告)日：2022-04-28

申请号：US17569449

申请日：2022-01-05

申请人： Yamaha Corporation

发明人： Tomoya MIYATA

IPC分类号： C08L23/22 ,  H04R1/02

摘要： A composition for an acoustic member includes a non-diene butyl rubber, and a liquid polymer having a molecular weight of 1,000 to 120,000. A difference in an SP value between the liquid polymer and the butyl rubber is within ±0.5.

公开(公告)号：US20210199517A1

公开(公告)日：2021-07-01

申请号：US17015302

申请日：2019-02-06

申请人： YAMAHA Corporation

发明人： Tomoya MIYATA

IPC分类号： G01L1/16 ,  G01H11/08 ,  G01L1/10

摘要： Provided is a measurement method including measuring, by using a piezoelectric sheet sensor in contact with a measurement object, vibration transmitted from the measurement object to the piezoelectric sheet sensor and measuring pressing force between the measurement object and the piezoelectric sheet sensor.

公开(公告)号：US20210289288A1

公开(公告)日：2021-09-16

申请号：US17333881

申请日：2021-05-28

申请人： Yamaha Corporation

发明人： Yu TSUCHIHASHI ,  Tomoya MIYATA

IPC分类号： H04R1/28

摘要： An electroacoustic transducer includes a housing, one or more partition walls, a diaphragm, and a tube. The one or more partition walls divide an inner space of the housing into a plurality of spaces, such that a volume of a first of the plurality of spaces is different from a volume of a second of the plurality of spaces except the first of the plurality of spaces. The diaphragm is disposed in the housing, such that one surface thereof faces the plurality of spaces. The tube establishes communication between a sound wave emission opening that is open to an outer space of the housing and each of the plurality of spaces.

公开(公告)号：US20170145595A1

公开(公告)日：2017-05-25

申请号：US15425191

申请日：2017-02-06

申请人： YAMAHA CORPORATION

发明人： Takayuki NOSE ,  Tomoya MIYATA

IPC分类号： D01F2/02 ,  D01D5/06 ,  D01D5/12 ,  C08K7/02 ,  C08L1/02

CPC分类号： D01F2/02 ,  C08K7/02 ,  C08L1/02 ,  D01D5/06 ,  D01D5/12 ,  D01F2/00

摘要： A cellulose fiber can reduce environmental burden while providing an enhanced modulus of elasticity easily and reliably. A composite material contains the cellulose fiber. A method of producing the cellulose fiber includes preparing a solution where needle-shaped phases each comprising a cellulose I crystal structure are dispersed in a matrix phase comprising a cellulose II crystal structure. The cellulose fiber includes the matrix phase and the needle-shaped phases contained in the matrix phase and the needle-shaped phases are oriented along an axial direction.