Patent ID: 6234602
Filing Date: 2001-05-22
Classification: B41J

Abstract:
A method of determining ink-jet printhead alignment offset, comprising the steps of:printing a test pattern on a sheet of media, said test pattern providing a design of predetermined nominal shape and spacing parameters in accordance with a first data set;acquiring a second data set representative of actual shape and spacing parameters of said test pattern from the test pattern on the sheet of media;fitting a first waveform representative of said first data set to said second data set such that an initial fit offset value is determined by a characteristic of fit between said first waveform and said second data set;partitioning said second data set into a plurality of individual third data sets selectively chosen from said pattern for measuring differential offset values evidenced in said second data set;fitting a measuring construct to each of said individual third data sets for determining an actual printhead alignment offset value for each of said third data sets; andcalculating an actual printhead alignment offset value for each of said third data sets using said initial offset in combination with comparison data representative of comparing said measuring construct and said second data set.