Patent ID: 8958595
Filing Date: 2015-02-17
Classification: H04R

Abstract:
1. A micro speaker comprising: a substrate having a cavity formed therethrough in a thickness direction of the substrate; a vibrating membrane that is disposed on the substrate and covers at least a center part of the cavity; a piezoelectric actuator disposed on the vibrating membrane, wherein a movement of the piezoelectric actuator vibrates the vibrating membrane; a piston diaphragm that is disposed in the cavity and is connected to the vibrating membrane; and a piston bar that is disposed at the center part of the cavity and connects the piston diaphragm with the vibrating membrane, wherein vibration of the vibrating membrane due to the movement of the piezoelectric actuator is delivered to the piston diaphragm through the piston bar, and the piston bar and the piston diaphragm are formed as a single body.