Patent ID: 8023871
Filing Date: 2011-09-20
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming section that forms an image on an object, the object being movable in a first direction and having a width in a second direction perpendicular to the first direction; a controlling section that controls the image forming section to form a calibration pattern on the object, the calibration pattern including a plurality of marks in a first group and a plurality of marks in a second group, the plurality of marks in the second group being formed at a different position in the second direction from the plurality of marks in the first group, the plurality of marks in each of the first group and the second group being arranged in the first direction over a predetermined range on the object, each of the plurality of marks having shape and color; a detecting section that detects the calibration pattern formed on the object, thereby obtaining detection results; and a correcting section that corrects, based on the detection results, an image forming position at which the image forming section forms an image, wherein the plurality of marks belonging to different groups and having a same color are formed at different positions with respect to the first direction in at least part of the predetermined range, and wherein each of the plurality of marks in the first group is arranged at a same position as a corresponding one of the plurality of marks in the second group with respect to the first direction, the each of the plurality of marks in the first group having a different color from the corresponding one of the plurality of marks in the second group.