PIEZOELECTRIC VIBRATOR FOR REGENERATING SOUND, AND PIEZOELECTRIC PANEL SPEAKER AND PIEZOELECTRIC EARPHONE HAVING THE SAME

摘要

Disclosed is a multiple layer piezoelectric vibrator using multiple layer piezoelectric material to significantly improve ability of reproducing low-pitched sound when sound is reproduced by a piezoelectric material and to implement high sound pressure in a broad sound range. The piezoelectric actuators including a metal-made elastic material such as copper, tungsten, and aluminum and piezoelectric materials attached to one or both sides of the elastic material are laminated by interposing a high-pitched sound absorption material such as porous nano-particles of now- woven fabric, nano-fiber, and carbon nano-tube, or nano-particles. When sound is reproduced by a multiple layer piezoelectric material, the ability of reproducing low-pitched sound can be improved. Two or more piezoelectric actuators are laminated so that sound pressure can be also improved. Moreover, cross-sections and shapes of the respective layers may be identical to or different from each other.