US 12,015,895 B2
Speaker
Kazuki Honda, Mie (JP); Masashi Nishida, Osaka (JP); Junichi Ikeda, Kyoto (JP); and Ippei Kiyama, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/919,715
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Oct. 15, 2021, PCT No. PCT/JP2021/038242
§ 371(c)(1), (2) Date Oct. 18, 2022,
PCT Pub. No. WO2022/102341, PCT Pub. Date May 19, 2022.
Claims priority of application No. 2020-187266 (JP), filed on Nov. 10, 2020.
Prior Publication US 2023/0142560 A1, May 11, 2023
Int. Cl. H04R 1/38 (2006.01); H04R 7/12 (2006.01)
CPC H04R 1/38 (2013.01) [H04R 7/127 (2013.01); H04R 2201/34 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A speaker comprising:
a diaphragm having a dome shape curved forward in a protruding manner;
a tubular member having the diaphragm disposed inside, the tubular member having an inner diameter increasing toward a front; and
a phase plug disposed in front of a front surface of the diaphragm,
wherein the phase plug includes:
a front surface facing forward,
a rear surface facing a central portion on the front surface of the diaphragm at a constant interval in parallel with the central portion, and
a side surface connecting the front surface and the rear surface,
wherein the front surface of the phase plug is larger than the rear surface of the phase plug as viewed in a front-rear direction of the speaker, and
wherein at least a part of the side surface of the phase plug has an inclined surface that extends outward while extending forward, faces an inner circumferential surface of the tubular member and the front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward the inner circumferential surface of the tubular member.