Image forming apparatus and control method thereof

Abstract

An image forming apparatus of the invention includes: a laser beam source; a laser beam source control unit configured to control the laser beam source based on image data; a plurality of photoconductive members respectively corresponding to a plurality of colors; a single piece of polygon mirror whose reflection surfaces are disposed in a rotation direction thereof with a plurality of different inclination angles respectively corresponding to the plurality of colors, scans the photoconductive members sequentially for each of the colors in a main scanning direction; a beam detector that is disposed adjacent to the photoconductive member on an upstream side of the photoconductive member in the main scanning direction; and an adjustment data control unit configured to change, in synchronization with a detection signal coming from the beam detector, color-based adjustment data for adjusting variations of an image quality parameter resulted from the optical paths and the photoconductive members varying with the colors.

Description

technical field [0001] The present invention relates to an image forming device and its control method, in particular to an image forming device and its control method for forming images by electrophotography. Background technique [0002] Conventionally, in image forming devices such as copiers, printing machines, and multifunction peripherals (MFP: Multi-Functional Peripheral), electrophotography is widely used. drum to form an electrostatic latent image on the photosensitive drum, and then develop the electrostatic latent image with toner. [0003] In an image forming apparatus using an electrophotographic method, a method called a tandem type is known as a method capable of color printing. A tandem image forming apparatus generally has four photosensitive drums corresponding to four colors of yellow (Y), magenta (M), cyan (C), and black (K). A full-color image is formed by forming toner images corresponding to respective colors side by side on respective photosensitive...

AI Technical Summary

Problems solved by technology

Therefore, when overlaying images of various colors, it will cause chromatic aberration problems

[0010] In addition, in order to change the direction of the light path, polygonal mirrors are installed on the optical path from the polygonal mirror to each photosensitive drum, but the reflection characteristics of these mirrors are also somewhat different depending on the optical path of each color.

Also, the incident angle of the laser light entering the f-θ lens differs depending on the inclination angle of the polygon mirror. Therefore, the attenuation characteristics of the f-θ lens in the main scanning direction are also somewhat different for each color.

[0011] When the optical characteristics such as the reflective characteristics of the mirror and the attenuation characteristics of the f-θ lens vary from color to color, the intensity of the laser light received on each photosensitive drum surface will also vary from color to color, so that the color of the synthesized full-color image It will be different from the originally intended color and will reduce the color reproducibility

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