Patent ID: 6447088
Filing Date: 2002-09-10
Classification: B41J

Abstract:
An ink-jet head comprising:a plurality of discharging ports for discharging an ink; a plurality of ink channels for guiding the ink to the discharging ports, each ink channel having at least two of the discharging ports corresponding thereto; and a plurality of discharging units, each comprising one said discharging port, and one heating element associated with that said discharging port, for generating a bubble for discharging the ink by applying to the ink within the corresponding ink channel thermal energy, wherein in each said ink channel a distance OH between the discharging port and the associated said heating element is not more than 30 &mgr;m, and a distance HC between a center of one said heating element and a center of another said heating element is greater than the distance OH, and each said discharging unit has an amount of ink discharge, wherein each of the ink channels contains several of the discharging units and at least some of the discharging units in a given said ink channel have different said amounts of ink discharge, wherein the heating elements may be driven individually or simultaneously, and an equivalent amount of ink is discharged from said discharging ports.