| 摘要 |
PURPOSE:To uniformize the whole area where pictures are formed and prevent the picture quality from deterioration by the unevenness of the quantity of light, by installing a correcting means which uniformize the quantity of near-infrared light on the total width of the surface of a photoconductive photosensitive body which hardly reacts to lights of short wavelengths. CONSTITUTION:A photosensitive drum 1 has a photoconductive layer of CdS, Se, etc., which hardly reacts to the light of short wavelengths. A mirror 9 is composed of non-absorbing substances of high refractive index and low refractive index which are alternately vacuum deposited on a transparent glass plate. Therefore, about 80% of the light image of an original is reflected by the colorless non-absorbing half mirror in visual light ranges. An exposure light source of near infrared 12 is composed of tungsten filament lamps 121 and a filter 122 which transmits near-infrared lights, and the lamps 121 are installed in a plural number in the direction of the revolving shaft of the drum 1 and turned on by a prescribed voltage at the time of separating and exposing each color. The light from the light source 12 is exposed upon the light image of the original under an overlapped condition through the half mirror 9 and uniformized throughout the whole area. |
