Patent ID: 6188419
Filing Date: 2001-02-13
Classification: H04N

Abstract:
A color image-forming device comprising:an image-forming section, provided with a recording section for color image formation and a recording section for monochrome image formation, each of which performs optical scanning of a photoreceptor by using a rotating polygon having a reflective mirror on at least one surface thereof to guide to said photoreceptor light modulated in accordance with image information; said image-forming section forming an electrostatic latent image on said photoreceptor by light scanning, the electrostatic image corresponding to said image information, and forming an image from the electrostatic image; andprocess speed switching means, which switches a process speed of said image-forming section such that said process speed is faster during monochrome image formation than during color image formation;said recording section for monochrome image formation being provided with a first scanning mode, which corresponds to a high process speed, and a second scanning mode, which corresponds to a low process speed, and which performs scanning with a scanning density equivalent to that of the said recording section for color image formation, without changing rotation speed of said rotating polygon having a reflective mirror on at least one surface thereof.