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.

公开(公告)号：US20190295516A1

公开(公告)日：2019-09-26

申请号：US15757810

申请日：2016-09-14

申请人： YAMAHA CORPORATION

发明人： Ryuji HASHIMOTO ,  Eiji ABE

IPC分类号： G10D13/02

摘要： A drum head includes: a head portion in which an opening is formed along a periphery of the head portion; and a protective skin closing the opening and having air permeability.

公开(公告)号：US20180322851A1

公开(公告)日：2018-11-08

申请号：US16039593

申请日：2018-07-19

申请人： YAMAHA CORPORATION

发明人： Eiji ABE

IPC分类号： G10D9/02

CPC分类号： G10D9/023 ,  G10D7/00 ,  G10D9/02

摘要： A woodwind instrument reed is strip-shaped and has a vamp on one side in a longitudinal direction. The reed includes a resin matrix containing a liquid crystal polymer as a principal component, and a layered mineral dispersed in the resin matrix. A method for producing a woodwind instrument reed that is strip-shaped and has a vamp on one side in a longitudinal direction includes charging a composition for forming the reed into a cavity of a mold from a longitudinal end on a side opposite to the vamp to be formed. The composition contains a liquid crystal polymer as a principal component, and a layered mineral.