Image forming apparatus provided with a movement control mechanism for optical system

摘要

This invention relates to an image forming apparatus of electro-photography type in which a light image obtained by reflected light from an original document image by projecting light onto the original document image is changed in size at a set magnification rate to form an electrostatic latent image on a photosensitive member, and the electrostatic latent image is developed into a toner image. The image forming apparatus includes: a magnification rate setting unit with a lens and a reflective mirror for determining a magnification rate of the light image; lens moving means for moving the lens between a first position and a second position; reflective mirror moving means for moving the reflective mirror between a third position and a fourth position along the optical path; and movement controlling means for controlling the lens moving means to move the lens and the reflective mirror between the first position and the second position and between the third position and the fourth position by respective predetermined distances upon receiving a command signal.