Patent ID: 6604802
Filing Date: 2003-08-12
Classification: B41J

Abstract:
An inkjet head comprising:(a) a pressure chamber for containing ink; (b) a nozzle for communicating through said pressure chamber; (c) a piezoelectric actuator having a piezoelectric element and deforming to increase or decrease a capacity of said pressure chamber due to piezoelectric effect of the piezoelectric element; and (d) a controller for driving said actuator by supplying signals including ink-ejecting signals for driving said actuator to eject the ink and ink-non-ejecting signals for driving said actuator not to eject the ink, so as to control ink in said chamber to be ejected from said nozzle at a desirable timing; and wherein said controller is operable to drive said actuator so that, when the desirable timing for ejecting ink is such that a frequency of said ink-ejecting signals is less than 20 kHz, ink-non-ejecting signals are supplied between ink-ejecting signals to cause an overall frequency of said signals to be not less than 20 kHz.