Loudspeaker and mobile device equipped with the same

1. A loudspeaker comprising

a frame having a hollow;

a diaphragm located in the hollow of the frame and having:

a first side as a surface of a recess defined by a thin part and a thick part formed around the thin part; and

a second side opposite to the first side;

an edge connecting an outer peripheral end of the diaphragm and the frame;

a magnetic circuit placed facing the recess and having a magnetic gap;

a voice coil body including:

a cylindrical bobbin;

a voice coil wound around at least part of the bobbin,

the voice coil body being placed in a center of the diaphragm so that the voice coil can be located in the magnetic gap;

a terminal fixed to the frame; and

a relay wire having a first end connected to the terminal and having a second end connected to the voice coil, at least part of the relay wire being located in the thick part.

2. The loudspeaker of claim 1 , wherein

the thick part has a through-hole; and

at least part of the relay wire is inserted in the through-hole.

3. The loudspeaker of claim 2 , wherein the through-hole penetrates between an inner peripheral surface and an outer peripheral surface of the diaphragm.

4. The loudspeaker of claim 2 , wherein the through-hole penetrates between the second side of the diaphragm and the outer peripheral surface of the diaphragm.

5. The loudspeaker of claim 2 , wherein the through-hole penetrates between the first side and the second side of the diaphragm.

6. The loudspeaker of claim 2 , further comprising a filler filled between the relay wire and the through-hole.

7. The loudspeaker of claim 1 , wherein at least part of the relay wire is routed along the first side of the thick part.

8. The loudspeaker of claim 1 , wherein

the first side of the thick part has a groove; and

at least part of the relay wire is routed along the groove.

9. The loudspeaker of claim 1 , wherein

the edge includes:

a first edge; and

a second edge located on an opposite side of the first edge with respect to a center in a thickness direction of the thick part, and

the terminal is located between the first edge and the second edge.

10. The loudspeaker of claim 1 , wherein

a gap is formed between a lateral side of an outer periphery of the diaphragm and an inner surface of the frame, and

the first end of the relay wire is connected to the terminal in the gap.

11. The loudspeaker of claim 1 , wherein the terminal includes a positive terminal and a negative terminal, and

the positive terminal and the negative terminal are located 180° rotationally symmetric with respect to a central axis of the voice coil.

12. The loudspeaker of claim 11 , wherein the relay wire includes:

a positive relay wire connecting a first terminal of the voice coil with the positive terminal; and

a negative relay wire connecting a second terminal of the voice coil and the negative terminal, and

the positive relay wire and the negative relay wire are located 180° rotationally symmetric with respect to the central axis of the voice coil.

13. The loudspeaker of claim 1 , further comprising a connection part formed in the recess and connecting the relay wire and the voice coil.

14. The loudspeaker of claim 1 , wherein

the thin part has an opening; and

the bobbin has a projection projecting from the opening.

15. The loudspeaker of claim 1 , wherein the diaphragm is made of foamed resin.

16. A mobile device comprising:

a body;

a drive part mounted in the body;

an amplifier mounted in the body; and

the loudspeaker of claim 1 receiving an output of the amplifier.

17. The mobile device of claim 16 , wherein

the body includes:

an interior part; and

an exterior part covering an outer periphery of the interior part with a predetermined space from the outer periphery, and

the loudspeaker is located in the space.

18. The mobile device of claim 17 , wherein the exterior part is either a door or a roof.