Patent ID: 7871160

Claim:
An inkjet printer, comprising: an ink tank to store ink, the ink tank comprising an inlet and an outlet; an auxiliary tank having an ink chamber through which the ink circulates with the ink tank; a head having nozzles which communicate with the ink chamber and eject ink therethrough; a filter which is positioned inside the auxiliary tank and divides the ink chamber into a first ink chamber which communicates with the ink tank and a second ink chamber which communicates with the nozzles, the first ink chamber comprising an auxiliary tank inlet configured to be connected with the outlet of the ink tank and an auxiliary tank outlet configured to be connected with the inlet of the ink tank; a circulation pipe which connects the ink tank with the first ink chamber and forms a circulation flow route; a pump which is positioned on the circulation flow route to apply a negative pressure to the auxiliary tank; and a compartment plate disposed between the auxiliary tank inlet and the auxiliary tank outlet, wherein the compartment plate is arranged such that ink flowing into the first chamber through the auxiliary tank inlet first flows onto the compartment plate and then flows from the compartment plate towards the filter.