METHOD FOR PRINTING BY INKJET PRINTHEAD, INKJET PRINTHEAD, METHOD FOR OPERATING INKJET PRINTHEAD, DRIVING CIRCUIT FOR INKJET PRINTHEAD, AND METHOD FOR CONTROLLING AVERAGE VELOCITY OF LIQUID DROPLET

摘要

PROBLEM TO BE SOLVED: To provide a method of actuating an inkjet printhead for printing on a substrate.

SOLUTION: The printhead includes: a nozzle for ejecting small ink droplets; a chamber that communicates with ink supply; and further electrically actuable means that is connected with the chamber and can actuate a plurality of times in accordance with print tone data, thereby ejecting the corresponding number of small droplets to form a print dot of an appropriate tone on the substrate. This method includes a step of applying a plurality of electrical signals to the electrically actuable means in accordance with the print tone data. The time delay between applications of successive signals is controlled such that a variation to an average velocity at which corresponding small droplets travel to the substrate to form the print dot remains to the extent of below a variation which leads to defects in the printed image detectable by the naked eye, regardless of the number of small droplets ejected to form the print dot.

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