Ink jet print head and ink jet printer

An ink jet print head, comprising:

• a plurality of nozzles capable of ejecting ink toward an object;
• at least two sets of pressure chambers, each set comprising a plurality of pressure chambers circularly or arcuately arranged around said nozzles, with each pressure chamber having a shape defined by a circumferential length and a radial length;
• a plurality of ink flow paths communicating said pressure chambers with corresponding ones of said nozzles;
• a diaphragm defining one surface of said pressure chambers, said diaphragm capable of vibrating to apply a pressure to said pressure chambers, thereby causing the ink within said pressure chambers to be discharged from said nozzles by way of said ink flow paths;
• and
• a plurality of piezoelectric elements attached to an external surface of said diaphragm to thereby vibrate said diaphragm,
• wherein a first, outer set of said at least two sets of pressure chambers is disposed radially outside a second, inner set of said at least two sets of pressure chambers, said first set of pressure chambers having (i) a circumferential length equal to or greater than a circumferential length of said second set of pressure chambers, and (ii) a radial length equal to or smaller than a radial length of said second set of pressure chambers.