Loudspeaker, electronic apparatus using same, and mobile apparatus

Patent metadata

Field	Value
Publication number	US-2016205477-A1
Application number	US-201615075107-A
Country	US
Kind code	A1
Filing date	Mar 19, 2016
Priority date	Sep 26, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A loudspeaker includes a frame, a magnetic circuit provided with a magnetic gap, a cone-shaped diaphragm, a voice coil, and an LED. The magnetic circuit is connected to a lower part of the frame. The diaphragm is connected to an outer periphery of the frame. A first end of the voice coil is connected to the diaphragm, and a second end thereof is inserted into the magnetic gap. The LED is provide on an upper part of the frame, and outputs light toward the center of the diaphragm. The LED is disposed such that the diaphragm reflects the light.

First claim

What is claimed is:

1 . A loudspeaker comprising:
a frame having an upper part and a lower part opposite to the upper part; a magnetic circuit connected to the lower part of the frame, and provided with a magnetic gap; a cone-shaped diaphragm having a front face and a rear face opposite to the front face, the rear face being connected to an outer periphery of the frame; a voice coil having a first end and a second end, the first end being connected to the diaphragm and the second end being inserted into the magnetic gap; and a light-emitting diode provided on the upper part of the frame, and disposed so as to output light toward a center of the diaphragm and the diaphragm reflects the light.

2 . The loudspeaker according to claim 1 ,
wherein the front face of the diaphragm has a concave part.

3 . The loudspeaker according to claim 1 ,
wherein the front face of the diaphragm has a convex part.

4 . The loudspeaker according to claim 3 ,
wherein the convex part is arc-shaped in cross section.

5 . The loudspeaker according to claim 3 ,
wherein the convex part includes: a first reflective part disposed with a tilt of a first angle with respect to the front face of the diaphragm, and a second reflective part disposed with a tilt of a second angle different from the first angle with respect to the front face of the diaphragm.

6 . The loudspeaker according to claim 3 ,
wherein a height of the convex part is not less than 0.01 mm and not greater than 0.07 mm.

7 . The loudspeaker according to claim 3 ,
wherein the convex part is concentric to the diaphragm and disposed in a circle on the front face of the diaphragm.

8 . The loudspeaker according to claim 7 ,
wherein the convex part is one of a plurality of convex parts and the plurality of convex parts is concentrically disposed.

9 . The loudspeaker according to claim 3 , wherein the convex part is spirally formed from an outer periphery of the diaphragm to the center of the diaphragm.

10 . The loudspeaker according to claim 1 ,
wherein the light-emitting diode is one of a plurality of light-emitting diodes disposed away from each other at equivalent intervals.

11 . The loudspeaker according to claim 1 ,
wherein the front face of the diaphragm has a color with a reflectivity higher than that of the rear face.

12 . The loudspeaker according to claim 1 ,
wherein the diaphragm includes a main resin material and a sub resin material with a reflectivity higher than that of the main resin material, and the sub resin material is contained in the main resin material.

13 . The loudspeaker according to claim 1 , further comprising a dust cap provided at the center of the diaphragm and protruding from the diaphragm toward the magnetic circuit.

14 . The loudspeaker according to claim 1 , further comprising a dust cap including a first face and a second face having a color with a reflectivity higher than that of the first face, the dust cap being provided at the center of the diaphragm such that the first face faces the magnetic circuit.

15 . The loudspeaker according to claim 1 , further comprising a dust cap provided at the center of the diaphragm, and including a main resin material and a sub resin material with a reflectivity higher than that of the main resin material.

16 . An electronic apparatus comprising:
a casing; an amplifier housed inside the casing; and the loudspeaker according to claim 1 electrically connected to the amplifier and housed inside the casing.

17 . A mobile apparatus comprising:
a main body; a driving unit installed in the main body; and the loudspeaker according to claim 1 installed in the main body.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kuribayashi Ryo
• Kubo Kazutaka
• Jin Yohei
• Sato Hitoshi
• Morimoto Hiroyuki

Classifications

• H04R2307/029

  Diaphragms comprising fibres · CPC title

• H04R7/127

  dome-shaped · CPC title

• H04R1/028

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

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title

• H04R1/025

  Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture · CPC title