公开(公告)号：US12015895B2

公开(公告)日：2024-06-18

申请号：US17919715

申请日：2021-10-15

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazuki Honda ,  Masashi Nishida ,  Junichi Ikeda ,  Ippei Kiyama

IPC: H04R1/38 ,  H04R7/12

CPC classification number: H04R1/38 ,  H04R7/127 ,  H04R2201/34

Abstract: A speaker includes: a diaphragm having a dome shape; a tubular member having the diaphragm disposed inside, and having an inner diameter increasing toward a front; and a phase plug. The phase plug includes: a front surface, a rear surface facing a central portion on a front surface of the diaphragm at a constant interval in parallel, and a side surface connecting the front surface and the rear surface. A front surface of the phase plug is larger than a rear surface of the phase plug as viewed in a front-rear direction of a speaker. At least a part of a side surface of the phase plug has an inclined surface extending outward while extending forward, faces an inner circumferential surface of the tubular member and a front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward an inner circumferential surface of the tubular member.