Patent ID: 8998382
Filing Date: 2015-04-07
Classification: B41J

Abstract:
1. A droplet ejection device comprising: a flow passage; a nozzle orifice formed in a wall of the flow passage; a circulation system for circulating a liquid through the flow passage; and an actuator system for generating a pressure wave in the liquid in the flow passage, wherein an obstruction member is arranged in the flow passage in a position opposite to the nozzle orifice and projecting towards the nozzle orifice, wherein the obstruction member extends transversely to the flow passage over the width of the flow passage, wherein the nozzle orifice is formed at an end of a nozzle passage that branches off from the flow passage, wherein the obstruction member is configured to force circulating liquid to flow through the nozzle passage along the nozzle orifice for removing contaminating particles and air bubbles in the vicinity of the nozzle orifice, and wherein the obstruction member extends into the nozzle passage over a width of the nozzle passage.