| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a speaker having a plurality of speaker units each of which is capable of reproducing voice sound in a different reproduction band, with less number of components, with reduction in thickness being easy and a circuit configuration being simple. <P>SOLUTION: A speaker 1 includes a vibration part 2 containing a dielectric layer 20 made from elastomer or resin and a plurality of electrode layers 21 and 22 arranged on both front and rear surfaces of the dielectric layer 20, and a plurality of speaker units 3, 4, and 5 which are arranged, when viewed from front side or rear side, at a part where the electrode layer 21 on the front surface of the dielectric layer 20, the dielectric layer 20, and the electrode layer 21 on the rear surface of the dielectric layer 20 overlap each other, with each of speaker units having a different reproduction band for voice sound. <P>COPYRIGHT: (C)2013,JPO&INPIT |
