Electro-Acoustic Converter, Module Using Same, Electronic Device, and Apparatus
Disclosed is a speaker comprising a frame connected with a magnetic circuit having a magnetic gap, a voice coil disposed adjacent to but not in contact with an upper side of the magnetic circuit, and a diaphragm bonded to a circumferential edge of the frame, wherein the frame and the diaphragm are configured into such peripheral shapes that conform to a mounting space allowed for the speaker inside an apparatus. This structure allows an external shape of the speaker to be freely configurable according to a limited space, yet the irregularly-shaped diaphragm is capable of being driven with an uniform amplitude, thereby providing an advantage of down-sizing and high performance.
1 . An electro-acoustic transducer comprising:
a magnetic circuit having a magnetic gap;
a frame connected with the magnetic circuit;
a voice coil disposed adjacent to but not in contact with the magnetic circuits; and
a diaphragm bonded to a circumferential edge of the frame,
wherein the frame and the diaphragm are configured into shapes having no regularity.
2 . The electro-acoustic transducer according to claim 1 , wherein external dimensions of the frame and external dimensions of the diaphragm are configured to be substantially equal.
3 . The electro-acoustic transducer according to claim 2 , wherein the voice coil includes a portion wound along at least a part of an outer periphery of the diaphragm, and disposed on a surface of the diaphragm in a configuration of wound coil.
4 . The electro-acoustic transducer according to claim 2 , wherein the magnetic circuit is arranged at the front and back sides of the diaphragm in a confronting manner.
5 . The electro-acoustic transducer according to claim 2 , wherein the voice coil is bonded to the diaphragm.
6 . The electro-acoustic transducer according to claim 2 , wherein the magnetic gap has a shape substantially analogous to a shape of an outer periphery of the diaphragm.
7 . The electro-acoustic transducer according to claim 2 , wherein the diaphragm is bonded with a plurality of voice coils of different kinds.
8 . The electro-acoustic transducer according to claim 7 , wherein the plurality of voice coils of different kinds individually perform reproduction of different frequency bands.
9 . The electro-acoustic transducer according to claim 7 , wherein the diaphragm has a discontinuous structure corresponding to the plurality of voice coils of different kinds.
10 . The electro-acoustic transducer according to claim 7 comprising a plurality of magnetic circuits corresponding to the plurality of voice coils of different kinds respectively.
11 . The electro-acoustic transducer according to claim 1 , wherein the voice coil is made of a metal wire having an insulation coating.
12 . The electro-acoustic transducer according to claim 1 , wherein the voice coil is made of a metal foil.
13 . The electro-acoustic transducer according to claim 1 , wherein the voice coil is made of an electro-conductive ink.
14 . The electro-acoustic transducer according to claim 1 , wherein the diaphragm is connected to the frame through a material having flexibility.
15 . The electro-acoustic transducer according to claim 1 , wherein the diaphragm is made of a resin.
16 . A module comprising an electro-acoustic transducer of claim 1 , and an electronic circuit connected thereto.
17 . An electronic device equipped with an electro-acoustic transducer of claim 1 .
18 . An apparatus equipped with an electro-acoustic transducer of claim 1.