Earphone, assembly jig, and earphone manufacturing method

An earphone, wherein:

• the earphone comprises a centrosymmetric shape;
• the earphone comprises an earphone front housing, an earphone magnet, a first electrode, and a second electrode;
• the earphone magnet comprises a ring structure surrounding a center line of the earphone, and the earphone magnet is fastened on an inner wall of the earphone front housing;
• and
• both the first electrode and the second electrode are located on an outer side of the earphone, and comprise ring structures surrounding the center line of the earphone, and the first electrode and the second electrode are respectively fastened on two opposite ends of the earphone front housing.

An earphone, wherein:

• the earphone comprises a centrosymmetric shape, and the earphone comprises an earphone rear housing, a third earphone circuit board assembly, an antenna, a controller, and a switch circuit;
• two feeding points are provided on a circuit board of the third earphone circuit board assembly, and the third earphone circuit board assembly is located in the earphone rear housing;
• the antenna is located in the earphone rear housing;
• the antenna comprises a common-mode antenna;
• the antenna comprises a first antenna branch and a second antenna branch;
• the first antenna branch and the second antenna branch are spaced;
• the first antenna branch and the second antenna branch each comprise a head end;
• the head end of the first antenna branch and the head end of the second antenna branch each are connected to at least one feeding point of the at least two feeding points;
• and
• the first antenna branch is coupled to the second antenna branch, wherein the antenna works in a specified frequency band;
• and
• the controller is configured to:
• determine an antenna branch with better signal quality from the first antenna branch and the second antenna branch;
• and
• control the switch circuit to switch the antenna branch with better signal quality to be a feeding end and switch the other antenna branch to be a grounding end.