Patent ID: 6142605
Filing Date: 2000-11-07
Classification: B41J

Abstract:
A method for swath-type ink printing without hue shift of a color printout on a printing medium with a pixel grid of rows separated by a given first true resolution in a media advance direction; said method comprising the steps of:installing a plurality of inkjet printheads in a scanning carriage which moves along a scanning axis in a forward printing direction and in a rearward printing direction across the printing medium with a pixel grid of columns separated by a given second resolution in said scanning axis, each of said printheads having a different color of ink, and each of said printheads having multiple nozzles with a nozzle resolution in the media advance direction greater than 300 dpi, said nozzle resolution being the same as the given first true resolution of the rows;positioning the inkjet printheads in the scanning carriage such that at least some of the multiple nozzles of the inkjet printheads are overlapping and respectively aligned in order to be capable of printing on adjacent rows during a single pass of the carriage along the scanning axis;calculating inking for each position in the grid independently; andperforming bidirectional color printing in both the forward printing direction and the rearward printing direction across the printing medium, including independently implementing the inking for each position in the grid.