Patent ID: 7370935

Claim:
A droplet discharge device to discharge a droplet to a workpiece, comprising: a head including a plurality of nozzle rows that have a plurality of nozzles on a nozzle surface in order to discharge the droplet of a supplied liquid; an optical non-discharge nozzle detector to detect a nozzle row of the plurality of nozzle rows having a clogged nozzle as a non-discharge nozzle; a suction device to seal the nozzle row including the non-discharge nozzle that is detected on the nozzle surface and performing suction from the nozzle row to eliminate clogging of the non-discharge nozzle; and a moisture retaining device to seal the plurality of nozzle rows on the nozzle surface to retain moisture of the nozzle surface, wherein; the droplet being discharged into the moisture retaining device and microvibration being applied to a liquid boundary in a one nozzle of the nozzle row by a driving element for discharge a droplet provided for the one nozzle, in order to prevent thickening of the liquid in the one nozzle that is not clogged and is normal in the nozzle row and prevent thickening of the liquid in the one nozzle from which clogging has been eliminated in the nozzle row.