IMAGE FORMING APPARATUS

摘要

The exposing unit emits a pair of light beams deflected to reverse scanning directions each other by a rotary polyhedron. The pattern creation unit creates color misregistration detection patterns on the transfer unit by the toner image in a reference color formed by a light beam emitted from an exposing unit and the toner image in an adjustment color formed by the other light beam having a different scanning direction. The color misregistration collection unit, on the basis of the image forming position of the toner image in the reference color, moves an image forming position of the toner image in each color formed by the light beam having the scanning direction opposite to the light beam corresponding to the reference color according to the color misregistration adjustment amount detected by the adjustment amount detection unit.

主权项

1. An image forming apparatus configured to form an image by overlaying images formed separately for every color, the apparatus comprising;
an exposing unit configured to emit a pair of light beams that are deflected to reverse scanning directions each other by a rotary polyhedron; image carriers disposed for every color and corresponding to respective light beams emitted from the plural exposing units, and each image carrier having an image carrier surface on which the corresponding light beam forms a latent image; developing units configured to form toner images corresponding to the latent images by sticking the toner onto the latent images on the image carrying surfaces; a transfer unit configured to transfer thereon the toner images carried by the image carrying surfaces of the image carriers; a pattern creation unit configured to create color misregistration detection patterns on the transfer unit by the toner image in a reference color formed by a light beam emitted from an exposing unit and the toner image in an adjustment color formed by the other light beam having a different scanning direction from the light beam emitted from the exposing unit; an adjustment amount detection unit configured to detect a color misregistration adjustment amount by means of the color misregistration detection patterns created on the transfer unit; and a color misregistration collection unit configured to, on the basis of the image forming position of the toner image in the reference color, move an image forming position of the toner image in each color formed by the light beam having the scanning direction opposite to the light beam corresponding to the reference color according to the color misregistration adjustment amount detected by the adjustment amount detection unit.