PURPOSE: To obtain copy image of high quality by using two cylindrical Fresnel lenses which have an axis perpendicular to a scanning direction and an axis crossing the scanning direction respectively, and arranging those lenses one over another and alloying them to reciprocate at a specific speed.

CONSTITUTION: The Fresnel lenses 10 and 11 are arranged in or near the image formation surface of a projection lens 7; enlarged projection light from the projection lens is converged and the resulting converged light is allowed to strike an image forming lens arranged in a copying part 2. The upper Fresnel lens 10 consists of the cylindrical Fresnel lens having the axis perpendicular to the scanning direction (a) and has a relatively large shape to allow the light of the entire picture to be copied at the same time; the lower Fresnel lens 11 consists of the cylindrical Fresnel lens having the axis crossing the scanning direction (a) and is made in a long and thin slit shape to allow the incidence of only part of the entire-picture light. The concatenation surface 1b of the upper Fresnel lens 10 is formed into a diffusing surface, which is rugged finely in conformity to a concatenation surface 1b.