Method for analyzing positional deviation of head modules, recording medium, and method for adjusting inkjet head

A method for analyzing positional deviation of head modules of an inkjet head, in which a plurality of head modules each having a plurality of nozzles ejecting a liquid arranged therein are connected and joined with each other, and adjacent head modules have overlapping regions, the method comprising:

• a division pattern creation step of dividing a printing pattern by the head modules and thereby creating division patterns;
• a conversion factor calculation step of obtaining conversion factors of the nozzles of each division pattern;
• a standard error calculation step of changing the number of nozzles used in calculation and thereby obtain a minimum value of a standard error of a positional deviation shift amount of the head modules;
• a repetition step of changing the number of divisions of the division patterns and performing the conversion factor calculation step and the standard error calculation step with the changed division patterns;
• a determination step of determining the number of divisions and the number of nozzles with which the value of the standard error is minimal;
• and
• a shift amount calculation step of creating an analysis chart with the number of divisions determined in the determination step and calculating the positional deviation shift amount of the head modules based upon an average value of the positional deviation shift amounts of nozzles corresponding to the number of nozzles determined in the determination step.