Patent ID: 8205964

Claim:
A head array unit, comprising: a head unit including a head member including a plurality of nozzles, configured to eject liquid droplets; and a head member retainer on which the head member is disposed and fixed thereto, the head member including a first reference hole and a second reference hole for aligning the head unit relative to an alignment member; and the alignment member including first and second openings at respective locations associated with the first reference hole and the second reference hole, respectively, at least one of the first and second openings in the alignment member having a diameter larger than a diameter of the corresponding reference hole in the head member retainer, wherein a distance between the first and second openings in the alignment member is substantially same as a distance between the first and second reference holes in the head member retainer, and wherein the second reference hole is a notch in a form of an elongated slot on an edge of the head member retainer.