Patent ID: 6406115
Filing Date: 2002-06-18
Classification: B41J

Abstract:
A method of printing by ejecting droplets of ink onto a printing substrate with a printhead having a plurality of drop ejectors with different sizes, comprising:firing a first size drop ejector during a first printing pass; shifting the printhead with respect to the printing substrate; and firing a second size drop ejector during a second printing pass so that the ejected droplets form spots having different diameters that are aligned in the printing direction, wherein shifting the printhead includes advancing the printing substrate a first amount for the first pass and advancing the printing substrate a second amount for the second pass, wherein the second amount is different than the first amount and shifting the printhead includes selectively firing a number of ejectors n, where n>0 and n is an even number not evenly divisible by four, to allow different size spots to be printed at every printing point.