Patent ID: 7909427
Filing Date: 2011-03-22
Classification: B01J,B41J

Abstract:
1. A device for printing a droplet on a substrate using an electric charge concentration effect, the device comprising: an electric field generating electrode which is needle-shaped and comprises: a substrate disposed below the droplet generating member, the substrate includes a target portion to which the droplet discharged from the discharge hole of the droplet generating member is dropped and attached; an open circuit type voltage applier electrically connected to the electric field generating electrode, the open circuit type voltage applier supplies electric charges to the electric field generating electrode so that the droplet drops onto the target portion of the substrate due to the Coulomb force generated between the charges of the electric field generating electrode and charges induced in the substrate; a volume measuring unit which measures the volume of the droplet while it hangs from the droplet generating member; and a droplet control unit which maintains the volume of the droplet at a predetermined level based on the measured volume of the droplet, wherein the droplet control unit increases or decreases compression in the solution in the receiving portion according to a signal from the volume measuring unit.