Patent ID: 6217161
Filing Date: 2001-04-17
Classification: B41J

Abstract:
An ink jet printer head for discharging ink comprising:a cavity plate prescribing (i) an ink flow path through which the ink is supplied, (ii) a plurality of ink storing chambers, each of which is connected to the ink flow path in which the supplied ink is temporarily stored, and (iii) a plurality of ink discharge holes which are connected to respective ones of the ink storing chambers through which the temporarily stored ink is discharged; anda piezoelectric element member, which is shaped in a plate opposed to said cavity plate and has a plurality of piezoelectric elements for selectively changing capacities of the ink storing chambers,said cavity plate comprising a main plate portion and a plurality of partition wall portions, which stand from said main plate portion and are arranged at substantially equidistant intervals, for partitioning the ink storing chambers adjacent to each other,each of said partition wall portions having a root side attached to the main plate portion and a tip side positioned away from the root side, each partition wall comprising (i) a straight wall portion, which is disposed at the tip side and is constant in width from the tip side toward the root side to prescribe a straight wall substantially perpendicular to said main plate portion, and (ii) an inclined wall portion, which is disposed at the root side and increases in width from the tip side toward the root side to prescribe an inclined wall oblique to said main plate portion.