| 摘要 |
According to the present invention, a speaker comprises: a yoke which has an accommodating space therein; a magnet disposed in the accommodating space and equipped with a plate on an upper surface thereof; a voice coil disposed between the yoke and the magnet; a vibration plate disposed in an upper part of the plate, in which the voice coil is fixated; a cap arranged in an upper opening part of the yoke in such a way that piezoelectric elements, composed of a metal plate and piezoelectric ceramics bonded on one side or both sides of the metal plate, are integrally coupled by an insert injection, wherein the piezoelectric elements are disposed in an upper part of the vibration plate; and a circuit board coupled to the lower outside of the yoke to receive electrical signals from the outside and transmit the signals to the voice coil and the piezoelectric elements. |
