Patent ID: 6921149

Claim:
A liquid drop discharging head comprising a plurality of ejector units arranged along a main scanning direction, wherein: each ejector unit includes a first ejector group arranged at one side in the main scanning direction and a second ejector group arranged at another side in the main scanning direction; each ejector group includes a plurality of ejectors; all of the ejectors are arranged two-dimensionally in a predetermined plane; each ejector group is formed of ejectors arranged two-dimensionally in the plane; each ejector includes at least one nozzle; a common passage provided in each ejector group to supply the ejectors with ink; the nozzles of each ejector group are alternately arranged so that when viewed in the main scanning direction, a nozzle of one ejector of the first ejector group is followed by a nozzle of one ejector of the second ejector group, and alternates this order along a sub-scanning direction; and the ejectors in each ejector group are disposed such that an imaginary line connecting the ejectors is substantially parallel to the corresponding common passage to supply the ejectors with ink and is inclined at a predetermined angle with respect to the sub-scanning direction.