Loudspeaker, electronic apparatus using same, and mobile apparatus

Patent metadata

Field	Value
Publication number	US-9813820-B2
Application number	US-201515023419-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	Feb 25, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A loudspeaker includes a light-emitting element, a frame, a magnetic circuit provided with a magnetic gap, a diaphragm, a voice coil bobbin, and a voice coil. The diaphragm has an inner circumferential end including an end face facing the light-emitting element, and a light guide having a reflecting surface formed thereon and provided at a position where light enters from the end face. The first end of the voice coil bobbin is joined to the inner circumferential end of the diaphragm, and the second end is inserted into the magnetic gap. The voice coil is wound around the second end of the voice coil bobbin. Light from the light-emitting element enters the end face of the diaphragm, is diffused by the light guide, and is reflected on the reflecting surface.

First claim

The invention claimed is:

1. A loudspeaker comprising:
a light-emitting element;
a frame;
a magnetic circuit joined to the frame and provided with a magnetic gap;
a diaphragm including an inner circumferential end including an end face facing the light-emitting element, and a light guide having a reflecting surface and provided at a position where light enters from the end face;
a cylindrical voice coil bobbin having a first end joined to the inner circumferential end, a second end inserted into the magnetic gap; and
a voice coil wound around the second end of the voice coil bobbin.

2. The loudspeaker according to claim 1 , wherein the light-emitting element is disposed at an inside of the voice coil bobbin.

3. The loudspeaker according to claim 2 , wherein the end face is joined to an outer circumferential surface of the voice coil bobbin.

4. The loudspeaker according to claim 3 , wherein the end face is shaped along the outer circumferential surface of the voice coil bobbin.

5. The loudspeaker according to claim 3 , further comprising a bonding part joining a part of the inner circumferential end excluding the end face with the voice coil bobbin.

6. The loudspeaker according to claim 3 , wherein the voice coil bobbin is made of a transmissive material.

7. The loudspeaker according to claim 3 , wherein the voice coil bobbin has a light inlet window penetrating the voice coil bobbin and allowing the light to enter the end face of the diaphragm.

8. The loudspeaker according to claim 2 , wherein the inner circumferential end of the diaphragm projects to the inside of the voice coil bobbin.

9. The loudspeaker according to claim 8 , wherein the first end of the voice coil bobbin has a bending part joined with the diaphragm.

10. The loudspeaker according to claim 9 , wherein the bending part bends to an outside of the voice coil bobbin.

11. The loudspeaker according to claim 8 , wherein the first end of the voice coil bobbin is provided with a cutout through which the inner circumferential end of the diaphragm penetrates.

12. The loudspeaker according to claim 8 , wherein the diaphragm has a projection joined with at least one of an outer circumferential surface and an inner circumferential surface of the voice coil bobbin.

13. The loudspeaker according to claim 1 , wherein the inner circumferential end of the diaphragm is bent along the inner circumferential surface or an outer circumferential surface of the voice coil bobbin.

14. The loudspeaker according to claim 13 ,
wherein the first end of the voice coil bobbin bends outward, and
the inner circumferential end of the diaphragm is bent along the outer circumferential surface of the voice coil bobbin and is joined with the voice coil bobbin.

15. The loudspeaker according to claim 1 , wherein the inner circumferential end of the diaphragm is thicker than the light guide.

16. The loudspeaker according to claim 1 , wherein the reflecting surface of the diaphragm has a plate-shaped projection.

17. An electronic apparatus comprising:
a sound source unit configured to output a sound source signal;
an audio processor electrically connected with output from the sound source unit; and
the loudspeaker according to claim 1 electrically connected with output from the audio processor.

18. A mobile apparatus comprising:
a body;
a drive unit provided inside the body;
a sound source unit accommodated in the body and configured to output a sound source signal;
an audio processor electrically connected with output from the sound source unit; and
the loudspeaker according to claim 1 attached to the body, and electrically connected with output from the audio processor.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Yuasa Takafumi
• Yamauchi Kenji
• Takayama Satoshi
• Nakayama Koichi
• Kuribayashi Ryo

Classifications

• F21V33/0056

  Audio equipment, e.g. music instruments, radios or speakers · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• H04R1/028

  associated with devices performing functions other than acoustics, e.g. electric candles · CPC title

• H04R2499/13

  Acoustic transducers and sound field adaptation in vehicles · CPC title