PIEZOELECTRIC MICRO SPEAKER AND METHOD OF MANUFACTURING THE SAME

摘要

PURPOSE: A piezoelectric micro speaker and a method for manufacturing the same are provided to reduce the reflection of sound by forming a sound absorbing layer on the surface of a rear plate which reflects the sound. CONSTITUTION: A device plate(110) includes a diaphragm(114), a piezoelectric driving part(118), and a front cavity(111). The piezoelectric driving part vibrates the diaphragm. The front cavity is located at the front side of the diaphragm. A front plate(130) is bonded at the front side of the device plate. The front plate includes a radiation hole(132) which is in connection with the front cavity. A rear cavity(121) is bonded at the rear side of the device plate. The rear cavity faces the piezoelectric driving part. A vent hole(128) is in connection with the rear cavity. A rear plate(120) includes a sound absorbing layer(129) which absorbs sound radiated to the rear side of the diaphragm.