US 12,256,184 B2
Earpiece and earphone
Yosuke Takubo, Kanagawa (JP)
Assigned to AUDIO-TECHNICA CORPORATION, Tokyo (JP)
Appl. No. 17/426,298
Filed by Audio-Technica Corporation, Tokyo (JP)
PCT Filed Jan. 29, 2020, PCT No. PCT/JP2020/003180
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/158802, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-013432 (JP), filed on Jan. 29, 2019.
Prior Publication US 2022/0109922 A1, Apr. 7, 2022
Int. Cl. H04R 1/10 (2006.01); H04R 1/34 (2006.01)
CPC H04R 1/1016 (2013.01) [H04R 1/345 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An earpiece, comprising:
an inner cylinder that includes one open end and the other open end and is attached to a sound conduit of an earphone; and
an outer cylinder connected to the one end of the inner cylinder and extending in an umbrella shape toward the other end of the inner cylinder so as to cover an outer surface of the inner cylinder, wherein
the inner cylinder includes:
a fitting part into which a tip of the sound conduit is fitted; and
a sound guide part configured to guide sound wave from the sound conduit to an ear canal,
the sound guide part includes:
a constant diameter part that has a constant inner diameter toward one end side from the other end side and is disposed adjacent to the fitting part; and
an expanded diameter part that has an inner diameter continuously expanding toward one end side from the other end side and is disposed adjacent to the constant diameter part,
the other end of the expanded diameter part is disposed closer to the other end side compared to a boundary between an inner surface of the outer cylinder and the outer surface of the inner cylinder in an axial direction orthogonal to a radial direction of the inner cylinder,
the length between an inner surface of the expanded diameter part and the outer surface of the inner cylinder in the radial direction of the expanded diameter part is the shortest at the boundary,
an outer diameter of the inner cylinder is constant toward the one end side from the other end side, and
the outer cylinder includes:
an extension part extending from the outer surface of the inner cylinder in the radial direction of the inner cylinder; and
a bent part bent from the extension part toward the other end side of the inner cylinder.