Patent ID: 8401220

Claim:
A micro speaker comprising: a substrate having a cavity formed therein; a diaphragm that is disposed on the substrate and overlaps the cavity, the diaphragm comprising: a first vibration membrane disposed in a first area corresponding to a center portion of the cavity; and a second vibration membrane disposed in a second area corresponding to an edge portion of the cavity, wherein a material of the second vibration membrane is different from a material of the first vibration membrane, and the second area surrounds the first area; a piezoelectric actuator comprising a first electrode layer disposed on the first vibration membrane, a piezoelectric layer disposed on the first electrode layer, and a second electrode layer disposed on the piezoelectric layer; a first lead wire that is disposed in the second area and is connected to the first electrode layer; and a second lead wire that is disposed in the second area and is connected to the second electrode layer, wherein the first and second lead wires are curved and are symmetrically disposed with respect to a center of the piezoelectric actuator.