Patent ID: 7697023

Claim:
An image forming apparatus, in which an electrostatic latent image is formed on a surface of a photoreceptor by exposure to light beams, the electrostatic latent image thus formed is developed by sticking toner on said electrostatic latent image, and said toner is transferred to a medium to be recorded for forming an image, comprising: a plurality of light beam sources; a deflecting part for deflecting a plurality of light beams generated by said plurality of light beam sources; at least one photoreceptor exposed to said plurality of light beams; a plurality of mirrors for guiding said plurality of light beams deflected by said deflecting part, each mirror guiding each light beam from said light beam sources to said at least one photoreceptor; and at least one lens for imaging each light beam on the surface of said at least one photoreceptor, wherein a curvature of a reflective surface of each mirror is respectively provided, so that a deviation of optical characteristic values of said plurality of mirrors on light paths between said plurality of light beam sources and said at least one photoreceptor is within a predetermined range, and wherein curvatures of the reflective surfaces of said plurality of mirrors are all positive or all negative.