Patent ID: 7494204
Filing Date: 2009-02-24
Classification: B41J,G06K

Abstract:
1. A method of correcting a sub-scan feed amount of a printing medium in a printing device which performs printing by recording ink dots on the printing medium while moving a print head in a main scan direction, comprising the steps of: (a) setting plural feed amounts of sub-scan of a printing medium that are to be used in actual printing; (b) printing a test pattern including a plurality of color patches printed with different correction values, respectively, for at least one representative feed amount among the plural feed amounts, the test pattern being used to determine a correction value for the representative feed amount; (c) using the correction value for the representative feed amount determined from a print of the test pattern in order to predict correction values for the other feed amounts; and (d) correcting sub-scan feed amounts during printing on the basis of the correction value for the representative feed amount and the predicted correction values for the other feed amounts; wherein the correction value for the other feed amounts are predicted from the correction value for the representative feed amount in accordance with a predetermined, non-linear, predictive curve; and wherein the representative feed amount includes a maximum value among the plural feed amounts, and the other feed amounts of the plural feed amounts for which the correction values are predicted are different from the representative feed amount.