| 摘要 |
A method and system for controlling the alignment and registration of color images such as those of cyan, yellow, magenta, and black (C, Y, M, K) which are successively printed on a photoconductive drum (30, 76) and then transferred from the drum to paper (44) during electrophotographic color printing. Each successive color image printed on paper is fused (36, 38) therein, and then vertical, horizontal and angular error signals are generated (56) after each fusion (36, 38). These error signals represent the difference between an original image reference position and the image position after each color image fusion into the paper. These error signals are then processed (60, 62) in a closed loop feedback control system in such a manner as to control (104, 102, 98) the position and scan rate of a laser beam (96) being projected onto the photoconductive drum (30, 76) to thereby cause the next-printed color image to be aligned with the previously printed color image. In this manner, the electro-optical control of each successively printed latent image formed on the photoconductive drum (30, 76) is responsible for the above alignment and paper correction without requiring complex mechanical schemes to accomplish same. <IMAGE> |
