| 摘要 |
PURPOSE:To obtain a hard copy having a high quality at a high speed, by modulating a laser beam and scanning a photosensitive body consisting of an insulating layer to which corona discharge has been executed, a photoconductive layer and a conductive supporting body, in case of printing out graphic and character information from an electronic computer, etc. CONSTITUTION:A beam of a laser oscillator 1 is led to a modulator 3 through reflecting mirrors 21, 22. An output of the modulator 3 whose strength has been modulated is reflected by a polyhedron reflector 5 from a beam expander 4, and is irradiated to a photosensitive body 8 through an f-theta image formation lens 7. A beam detector 18 decides a start timing of a signal to the modulator 3. The surface of the photosensitive body 8 consists of a conductive supporting body, a photoconductive layer and an insulating layer, on which a primary corona charger 9 and a secondary corona charger 10 are provided, and a pattern based on a difference of the surface potential is formed in accordance with a bright and dark pattern of a laser beam 12. Subsequently, it is exposed uniformly by a lamp 19, an electrostatic image whose contrast is high is formed, and a hard copy is obtained by means of a transfer system electrophotography. |
