公开(公告)号：US09756426B2

公开(公告)日：2017-09-05

申请号：US15023383

申请日：2015-08-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroko Tsutsumi ,  Koichi Nakayama ,  Satoshi Koura ,  Kazuhiro Oshika ,  Mitsukazu Kuze ,  Tomonori Shibuya

IPC: H04R9/06 ,  H04R7/04 ,  H04R1/24 ,  H04R7/22 ,  H04R9/02 ,  H04R7/12 ,  H04R7/16 ,  H04R7/24

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.

公开(公告)号：US10531170B2

公开(公告)日：2020-01-07

申请号：US16310500

申请日：2017-08-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshimichi Kajihara ,  Takuji Miyamoto ,  Yuuki Izumi ,  Satoshi Koura

IPC: H04R1/02 ,  H04R9/06 ,  H04R9/02 ,  H04R7/16

Abstract: A loudspeaker device includes a loudspeaker, a box, and a lid. The box is provided with an opening and accommodates the loudspeaker. The lid covers the opening of the box. The lid includes a grille with one or more hexagonal holes each having an opening area equal to the area of a circle with a diameter in a range from 6.0 mm to 9.0 mm, inclusive.

公开(公告)号：US10104475B2

公开(公告)日：2018-10-16

申请号：US15496315

申请日：2017-04-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuuki Izumi ,  Satoshi Koura ,  Tomonori Shibuya

IPC: H04R9/02 ,  H04R7/18 ,  H04R9/06

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.