Patent ID: 7905431

Claim:
An ink jet recording head, comprising: a nozzle plate having a plurality of nozzle orifices; a metal plate having: at least two pressure generating chambers, which are configured to eject ink and provided in a row in a row direction; at least two dummy pressure generating chambers, which are configured not to eject ink and provided outside of one end of the row in the row direction, wherein there are no additional pressure generating chambers outside of the at least two dummy pressure generating chambers in the row direction; and a gap portion, partly communicating at least two of the dummy pressure generating chambers; and a piezoelectric vibrator providing a pressure variation to ink inside of the pressure generating chambers, wherein at least one of the dummy pressure generating chambers has a different shape from the pressure generating chambers, a width of one of the dummy pressure generating chambers is greater than a width of a partition wall between one of the pressure generating chambers, which corresponds to the one end of the row, and one of the dummy pressure generating chambers, which is adjacent to the one of the pressure generating chambers, and wherein the width of the one of the dummy pressure generating chambers is greater than a width of a partition wall between the one of the dummy pressure generating chambers and an adjacent one of the dummy pressure generating chambers.