Patent ID: 7828414
Filing Date: 2010-11-09
Classification: B41J

Abstract:
1. A head adjustment method of adjusting overlaps of a plurality of print heads, which are arranged in a widthwise direction of a print medium in an image forming apparatus, in the widthwise direction, the method comprising: setting a theoretical input pattern image to be formed by the print heads by theoretically setting discontinuous areas between widthwise unit images formed by the neighboring print heads positioned next to each other, respectively, and forming a plurality of comparative unit images, which include the widthwise unit images, in accordance with a time difference along a feeding direction of the print medium; outputting a practical output pattern image onto the print medium by driving the print heads according to the input pattern image; estimating practical overlap values of the print heads through the output pattern image; and adjusting degrees of overlap between the print heads according to the estimated overlap values, wherein the discontinuous areas between the comparative unit images vary from each other.