US 11,985,492 B2
Speaker and method of manufacturing a speaker
Naoki Shinmen, Tokyo (JP); Koya Nomoto, Aichi (JP); Go Igarashi, Tokyo (JP); and Takanari Okita, Aichi (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/440,697
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Mar. 11, 2020, PCT No. PCT/JP2020/010551
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/195837, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-056894 (JP), filed on Mar. 25, 2019.
Prior Publication US 2022/0167090 A1, May 26, 2022
Int. Cl. H04R 9/02 (2006.01); H04R 31/00 (2006.01)
CPC H04R 9/025 (2013.01) [H04R 31/00 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A speaker, comprising:
an outer magnet that has a ring shape and is magnetized along an axial direction of the ring shape;
an inner magnet that has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in a direction opposite to a direction of the outer magnet along the axial direction, and is disposed inside the outer magnet through a gaps;
an outer component portion including the outer magnet;
an inner component portion including the inner magnet and forming a magnetic gap with the outer component portion; and
a vibrating plate component portion including a coil disposed in the magnetic gap and a vibrating plate;
wherein the outer component portion has an opening that is opened perpendicularly to the axial direction of the outer magnet and has a diameter larger than an outer diameter of the inner magnet
a lead wire of the coil is extracted to an outside through the opening
the inner magnet has a ring shape having an axial direction equal to the axial direction of the outer magnet and
the inner magnet is inserted into the opening and fixed.
 
9. A method of manufacturing a speaker, comprising:
forming an outer component portion including an outer magnet that has a ring shape and is magnetized along an axial direction of the ring shape;
forming an inner component portion including an inner magnet that has a circular outer shape with a diameter smaller than an inner diameter of the outer magnet and is magnetized along an axial direction of the circular shape; and
assembling the outer component portion and the inner component portion such that the inner magnet is disposed inside the outer magnet through a gap and such that a magnetizing direction of the outer magnet and a magnetizing direction of the inner magnet are opposite to each other
wherein the assembling the outer component portion and the inner component portion includes supporting at least one of the outer component portion or the inner component portion by a jig for equalizing the axial direction of the outer magnet and the axial direction of the inner magnet.