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Patent Agency Ranking
公开(公告)号：US10057686B2
公开(公告)日：2018-08-21
申请号：US15503848
申请日：2015-12-03
Inventor： Yuichi Kobayashi , Masahiko Miyazaki
CPC classification number: H04R9/06 , H04R1/025 , H04R7/12 , H04R7/18 , H04R9/025 , H04R2201/028 , H04R2499/11 , H04R2499/13 , H04R2499/15
Abstract: A loudspeaker includes a bottom plate, an internal magnet, an internal plate, an external magnetic part, a frame, a diaphragm, and a voice coil. The internal plate includes a cutout portion so that the internal plate is smaller than the internal magnet when viewed from the top surface of the internal plate. Between the voice coil and the internal plate, there are a holding portion holding magnetic fluid and a void part having a void. The magnetic fluid is held in part of the cutout portion.
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公开(公告)号：US20200374613A1
公开(公告)日：2020-11-26
申请号：US16635326
申请日：2018-08-01
Inventor： Shuji Saiki , Yuji Matsuo , Kazuyuki Kosuda , Yuichi Kobayashi , Yasuhiro Makino
Abstract: A loudspeaker including: a magnetic circuit, a voice coil, a vibration plate, a housing, and a magnetic fluid disposed between a plate and the voice coil in a magnetic gap. The magnetic circuit includes a first flow path which passes from a vibration plate side to a rear surface. The housing includes a second flow path which extends the first flow path, and a third flow path which passes through from the vibration plate side to the second flow path. A proportion of a second area to a first area matches with a proportion of an outer area to an inner area, which is an area of the vibration plate corresponding to an inner side with respect to the voice coil.
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公开(公告)号：US10244309B2
公开(公告)日：2019-03-26
申请号：US15324005
申请日：2015-06-24
Inventor： Yuichi Kobayashi
Abstract: A speaker system includes an enclosure, a speaker unit, and an elastic sheet. The speaker unit is disposed in the enclosure. The elastic sheet includes a first fiber made of a resin and a second fiber made of a resin, and is disposed in the enclosure. The second fiber is thicker than the first fiber and entangled with the first fiber.
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公开(公告)号：US20200267475A1
公开(公告)日：2020-08-20
申请号：US16755055
申请日：2018-09-18
Inventor： Kazuyuki Kosuda , Yuji Matsuo , Yuichi Kobayashi , Yasuhiro Makino
Abstract: A loudspeaker (100) includes a magnetic circuit (110) having a magnetic gap (111); a voice coil body (120) disposed in the magnetic gap (111) in an inserted state; a diaphragm (130) to which the voice coil body (120) is attached; a frame (140) to which the outer circumferential, portion of the diaphragm (130) and the magnetic circuit (110) are attached; a vibration preventing member (150) including a viscoelastic body attached to the outer circumferential, portion of the diaphragm (130) in an annular shape; and a holding member (160) having an annular shape and sandwiching the outer circumferential portion of the diaphragm (130) and the vibration preventing member (150) between the frame (140) and the holding member.
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公开(公告)号：US20200213785A1
公开(公告)日：2020-07-02
申请号：US16634695
申请日：2018-08-01
Inventor： Yuji Matsuo , Kazuyuki Kosuda , Yuichi Kobayashi , Yasuhiro Makino
Abstract: Included are a yoke, a magnet fixed to the yoke, a plate fixed to an end surface of the magnet opposite to an end surface to which the yoke is fixed, a voice coil disposed inside a magnetic gap formed by facing portions disposed in the yoke and the plate, respectively, to face each other, a vibration plate fixed to the voice coil, a holding member which holds the yoke and the vibration plate, and a magnetic fluid disposed between the facing portion of the plate and the voice coil. A coating containing a fluorine resin is formed on a surface of a portion contacting the magnetic fluid in at least one of the plate and the voice coil.
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