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：US20190311702A1

公开(公告)日：2019-10-10

申请号：US16463400

申请日：2017-11-29

申请人： YUPO CORPORATION ,  YAMAHA CORPORATION

发明人： Hiroshi KOIKE ,  Yutaro SUGAMATA ,  Seiichiro IIDA ,  Kunio HIYAMA ,  Suguru SASAKI ,  Hidekazu KODAMA

IPC分类号： G10H3/14 ,  H01L41/193 ,  H01L41/047

摘要： Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 μm.

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：US20210258693A1

公开(公告)日：2021-08-19

申请号：US17308562

申请日：2021-05-05

申请人： Yamaha Corporation

发明人： Hiroshi NAKASHIMA ,  Eiji ABE ,  Kunio HIYAMA

IPC分类号： H04R7/12 ,  B32B27/32 ,  B32B27/06 ,  H04R31/00

摘要： A speaker diaphragm includes a first polymer and a second polymer. The first polymer and the second polymer undergo phase separation. The first polymer is a polyolefin, and the second polymer is a thermoplastic resin being immiscible with the polyolefin. One of either the polyolefin or the thermoplastic resin constitutes a sea phase, and another one of either the polyolefin or the thermoplastic resin constitutes island phases being interspersed in the sea phase.

公开(公告)号：US20210136498A1

公开(公告)日：2021-05-06

申请号：US17148098

申请日：2021-01-13

申请人： Yamaha Corporation

发明人： Hiroshi NAKASHIMA ,  Eiji ABE ,  Tsunenori SANO ,  Kunio HIYAMA

IPC分类号： H04R7/12 ,  H04R31/00

摘要： A speaker diaphragm includes a substrate. The substrate includes a resin matrix and fibers. The resin matrix contains a thermoplastic resin as a main component. The fibers are dispersed in the resin matrix. The fibers are polyparaphenylenebenzobisoxazol fibers. An average length of the fibers is 0.5 mm or more and 3.0 mm or less.