| 摘要 |
PURPOSE:To make the distribution of the light quantity on the surface of a photoreceptor uniform with a simple adjustment, by providing plural photodetectors, which change the output in accordance with the light quantity from a light source, near the photoreceptor and providing a means for the adjustment of the inclination to the optical axis. CONSTITUTION:A slit member 11 is provided near a photoreceoptor 8, and the light from a light source is condensed by this slit member and is projected to the surface of the photoreceptor. An aperture card holding part 5 is movable, and the light from a light source device 4 scans a microfilm on the holding part 5 in every line. Plural photodetectors 12 which generate outputs corresponding to the light quantity are arranged in the axial direction of the photosensitive drum above the surface of the photoreceptor 8 and in part where these phtotodetectors 12 have no influence upon the copying operation of a slit member 11 provided adjacently to them. Thus, a high-precision distribution of the light quantity is obtained, and the adjusting work is performed easily in a short time. |
