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公开(公告)号：US09756426B2
公开(公告)日：2017-09-05
申请号：US15023383
申请日：2015-08-17
Inventor： Hiroko Tsutsumi , Koichi Nakayama , Satoshi Koura , Kazuhiro Oshika , Mitsukazu Kuze , Tomonori Shibuya
CPC classification number: H04R9/063 , H04R1/24 , H04R7/04 , H04R7/127 , H04R7/16 , H04R7/22 , H04R7/24 , H04R9/02 , H04R2209/022 , H04R2209/024 , H04R2209/027 , H04R2307/207 , H04R2400/07 , H04R2400/11
Abstract: A loudspeaker includes a diaphragm body having a dome shape protruding upwardly, a magnetic circuit disposed below the diaphragm body, a voice coil coupled to the diaphragm body, an edge coupled to an outer circumference of the diaphragm body, and a frame coupled to the edge. The edge includes a first coupling portion provided at an outer circumference of the edge, a second coupling portion provided at an inner circumference of the edge and coupled to an outer circumference of the diaphragm body, and a roll portion disposed between the first coupling portion and the second coupling portion. The edge has a surface facing downward. The frame has a connecting surface disposed below the second coupling portion and coupled to the surface of the edge at the first coupling portion of the edge. This loudspeaker can decrease distortion of sound.
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2.发明授权公开(公告)号：US09781515B2
公开(公告)日：2017-10-03
申请号：US15023684
申请日：2015-08-21
Inventor： Tomonori Shibuya , Yoshiyuki Takahashi , Yoshimichi Kajihara , Tetsushi Itano , Mitsukazu Kuze , Takayuki Dan
CPC classification number: H04R7/06 , H04R7/125 , H04R9/045 , H04R9/06 , H04R2307/021 , H04R2307/029 , H04R2499/11 , Y10S977/796
Abstract: A loudspeaker diaphragm includes a base layer and a coating layer. The base layer contains natural fibers. The coating layer is composed of bamboo cellulose nanofibers and is formed at least on the first side of the base layer. The coating layer has a thickness in the range of 3% to 15%, both inclusive of the sum of the thicknesses of the base layer and the coating layer.
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公开(公告)号：US10708693B2
公开(公告)日：2020-07-07
申请号：US16302286
申请日：2017-06-15
Inventor： Tomonori Shibuya , Yoshiyuki Takahashi , Nobuo Nakamura , Takayuki Dan , Tetsushi Itano
Abstract: A vibration component for loudspeakers includes a base layer, an intermediate layer, and a coating layer. The base layer has a front face and a rear face, has a first density, and is formed of a paper body containing a plurality of fibers. The intermediate layer has a first face joined to the front face of the base layer, and a second face on a reverse side of the intermediate layer from the first face, has a second density higher than the first density, and includes a plurality of cellulose fibers as a main component. The coating layer is provided on the second face of the intermediate layer, and includes an inorganic powder formed of a plurality of inorganic fine particles.
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公开(公告)号：US10104475B2
公开(公告)日：2018-10-16
申请号：US15496315
申请日：2017-04-25
Inventor： Yuuki Izumi , Satoshi Koura , Tomonori Shibuya
Abstract: A magnetic circuit includes: a magnet including a first and a second surface; a top plate disposed on the first surface; a bottom plate coupled magnetically with the second surface; and a yoke coupled magnetically with the bottom plate and disposed so as to protrude from the bottom plate along a first direction. The second surface is parallel to the first surface. The first and the second surfaces are magnetized. The yoke includes a magnetic pole face that opposes the top plate. In a portion where the magnetic pole face is formed, of the yoke, a magnetic saturation part is disposed to generate magnetic saturation. The magnetic saturation part has a shape in which an area of a cross section perpendicular to the first direction decreases with nearness to a tip of the yoke along the first direction.
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