Patent ID: 6238037
Filing Date: 2001-05-29
Classification: B41J,G06K

Abstract:
A method of performing interlace printing on a print medium with a printhead of an ink jet printer, said method comprising the steps of:providing an array of pixel locations on the print medium, each said pixel location being surrounded by between three and eight surrounding pixel locations, each said pixel location, having a common maximum number M of ink drops that said pixel location may receive;for each said pixel location, assigning a respective desired number D of ink drops which are to be placed at said pixel location, each said desired number D being one of less than and equal to M;creating N sets of threshold values, N being one of equal to and greater than M, each of said pixel locations corresponding to one of said threshold values of each said set of threshold values, integer portions of each pair of said threshold values of a same said set that correspond to respective ones of a selected said pixel location and a selected said surrounding pixel location being unequal;selectively jetting a respective, single ink drop at each said pixel location, whether said single ink drop is jetted onto a respective said pixel location being dependent upon said desired number D assigned to said respective pixel location and said corresponding threshold value of one of said sets of threshold values; andrepeating said selectively jetting step N-1 additional times, each said selectively jetting step using a different one of said sets of threshold values.