US 12,407,976 B2
Coaxial earphone core
Zhang Ren, Changzhou (CN); and Zhiwei Zhong, Changzhou (CN)
Assigned to AAC Microtech (Changzhou) Co., Ltd., Changzhou (CN)
Filed by AAC Microtech (Changzhou) Co., Ltd., Jiangsu (CN)
Filed on May 26, 2023, as Appl. No. 18/324,183.
Application 18/324,183 is a continuation of application No. PCT/CN2022/136717, filed on Dec. 6, 2022.
Prior Publication US 2024/0187782 A1, Jun. 6, 2024
Int. Cl. H04R 1/24 (2006.01); H04R 7/12 (2006.01); H04R 7/18 (2006.01); H04R 9/02 (2006.01); H04R 9/04 (2006.01); H04R 9/06 (2006.01)
CPC H04R 1/24 (2013.01) [H04R 7/127 (2013.01); H04R 7/18 (2013.01); H04R 9/025 (2013.01); H04R 9/045 (2013.01); H04R 9/063 (2013.01); H04R 2400/11 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A coaxial earphone core comprising:
a first frame;
a second frame;
a magnet system, comprising:
a first yoke fixed to the first frame;
a first magnet fixed to the first yoke;
a second magnet surrounding the first magnet to form a first magnetic gap;
a second yoke fixed on one side of the first magnet away from the first yoke;
an annular third magnet fixed to the second yoke;
a first sound unit, comprising:
a first diaphragm peripherally mounted on the first frame; and
a first coil fixed to the first diaphragm and inserted into the first magnetic gap;
a second sound unit coaxially surrounded by the first sound unit, comprising:
a second diaphragm mounted on the second frame; and
a second coil fixed to the second diaphragm; wherein
the second frame is fixed on one side of the third magnet away from the second yoke; the second yoke comprises an annular extending wall bending and extending into the third magnet; the extending wall is spaced apart from the third magnet to form a second magnetic gap; the second coil is inserted into the second magnetic gap; the second diaphragm is located on one side of the first diaphragm facing the magnet system along a vibration direction;
the first diaphragm comprises an annular inner diaphragm located in a central position, a first dome surrounding the first inner diaphragm, a first skeleton surrounding the first dome, and an first outer diaphragm surrounding the first skeleton; the second diaphragm is located on one side of the first inner diaphragm facing the magnet system along the vibration direction.