JP2003154703A5 - - Google Patents

Claims (4)

Image forming means for forming an image with a plurality of lines as a set in the axial direction of the image carrier, transport means for transporting a transfer material onto which the image is transferred, and image formation for forming an image with the plurality of lines as a set In an image forming apparatus having registration correction means for correcting registration deviation of each line of the means,
The registration correction means includes a pattern forming means for controlling each of the image forming means so as to form a registration correction mark on the image carrier, a mark detection means for detecting the registration correction mark, and An image forming apparatus, wherein a registration error between the lines is corrected based on a detection result of a mark detection unit. The image forming means forms an image with n lines as a set, and the pattern forming means controls only the image forming means for forming the first line of the n lines to control the first registration correction mark. And the second registration correction mark is formed by controlling only the image forming means for forming the second line of the n lines following the first registration correction mark. 3. The image reading apparatus according to claim 1, wherein the registration correction marks are formed in order of third, fourth,..., N-1 and nth.   A calculating unit that calculates a registration shift of each line from the detection result of the mark detecting unit; 3. An image reading apparatus according to claim 1 or 2, wherein a registration error is calculated. In an image forming apparatus having an image forming means for forming an image with a set of a plurality of lines by one scanning with at least first and second laser beams in the axial direction of an image carrier
Control means for controlling the image forming means to form a mark for image alignment on the image carrier;
A transfer belt that moves to transfer a mark formed on the image carrier at a transfer position;
Detecting means for detecting the position of the mark on the transfer belt;
Correction means for correcting the resist misalignment element based on the detection output by the detection means,
The control means controls to form the first mark using only the first laser beam, and then forms the second mark using only the second laser beam;
The image forming apparatus according to claim 1, wherein the correction unit corrects a resist misalignment element between the first and second laser beams based on detection outputs of the first mark and the second mark by the detection unit.