Patent ID: 8020982

Claim:
A bubble removing apparatus comprising: an ink circulation line that connects an ink tank containing ink and a printer head; a filter unit including an ink inlet and an ink outlet disposed on a same end of the filter unit, the filter unit installed on the ink circulation line to filter out foreign materials contained in the ink; a housing having a filter disposed between the ink inlet and the ink outlet, wherein the housing is tapered such that the cross-sectional area of the housing gradually degreases in a direction away from the ink inlet; and a pump capable of operating in a forward and a reverse direction that operates to circulate the ink in the forward direction and in the reverse direction through the ink circulation line, wherein the ink circulation line has a length L 1 from the ink outlet to the printer head greater than a length L 2 from the ink inlet to the ink tank, and wherein L 1 >L 2 .