Patent ID: 8678299

Claim:
A droplet dispensing apparatus, comprising: an elastic tube having an elastic body, defining a storage space therein, and extending a predetermined length, and including a deforming part provided on an outer surface of the elastic body; and a hollow actuator including a hollow piezoelectric stack which is constructed by stacking multiple layers of piezoelectric devices, wherein each of the piezoelectric devices is made by coating opposite surfaces of a thin ceramic sheet with an electrode, and making a hole through the thin ceramic sheet and the hole of each of the piezoelectric devices is directly coupled to the outer surface of the elastic tube so as to expand and contract the elastic tube in a longitudinal direction of the elastic tube when an external voltage is applied and to generate a force and a displacement in the longitudinal direction when an electric field is applied, wherein the hollow actuator is expanded or contracted in the longitudinal direction of the elastic tube when the external voltage is applied, thereby reducing or enlarging the volume of an inner space of the elastic tube.