Patent ID: 8939550
Filing Date: 2015-01-27
Classification: B41J

Abstract:
1. An inkjet printhead comprising: a plurality of sets each of which includes a nozzle to eject ink, a pressure chamber communicating with the nozzle, and an actuator to apply force to eject the ink in the pressure chamber through the nozzle, wherein the sets are two-dimensionally arrayed; a circuit board including: a connection member to connect the wires to a driving unit, the connection member being provided outside of an array area, the array area being an area where all of the sets of the inkjet printhead are two-dimensionally arrayed, wherein the nozzles are arranged linearly to form nozzle rows, and the number of the nozzles in each of the nozzle rows is M, wherein M is an integer of 2 or more; wherein the number of the nozzle rows is N, wherein N is an integer of 2 or more; wherein the through hole via corresponding to each of the nozzles of n nozzle row of the N nozzle rows is provided inside of the array area, wherein n is any integer satisfying 1≦n<N; and wherein the through hole via corresponding to each of the nozzles of the N nozzle rows except the n nozzle row is provided outside of the array area and is provided between the array area and the connection member, the through hole via corresponding to each of the nozzles of the N nozzle rows except the n nozzle row are apart from an area where the connection member is disposed on the circuit board and are connected to the connection member by the wires.