公开(公告)号：US20180167734A1

公开(公告)日：2018-06-14

申请号：US15834449

申请日：2017-12-07

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Shuichi KONNO ,  Ryo KURIBAYASHI ,  Kazutaka KUBO ,  Hiroyuki AMADA ,  Yohei JIN ,  Hiroyuki MORIMOTO

IPC: H04R7/12 ,  H04R9/06 ,  H04R9/02 ,  H04R7/18 ,  H04R1/28

CPC classification number: H04R7/127 ,  H04R1/288 ,  H04R7/12 ,  H04R7/18 ,  H04R7/20 ,  H04R9/025 ,  H04R9/06 ,  H04R2307/021 ,  H04R2307/204 ,  H04R2400/11

Abstract: A loudspeaker diaphragm includes a cone having a curved surface from the outer to the inner periphery, and an annular edge of which inner peripheral part is bonded to the front side of the outer peripheral part of the cone. When seen from the front, the outer periphery of the cone is defined by smooth connection of three larger-diameter parts tangent to a first circle with a larger diameter, and three smaller-diameter parts each located between adjacent two of the three larger-diameter parts and tangent to a second circle with a smaller diameter. In the cone, a shape defined by connecting together points at the same position on the central axis is more circular as the points approach the inner periphery from the outer periphery. The inner periphery of the edge has a smaller radius than the second circle.