| 摘要 |
PURPOSE:To obtain a copy, by controlling the quantity of exposure light by the output of the detecting means for the quantity of reflection light of the original so that the electrostatic contrast of the photosensitive drum becomes maximum. CONSTITUTION:Condensing light transmission material 3 is provided with many picture generating optical fiber tubes 3a arranged in parallel in the direction orthogonal to the movement direction of table 1, and part 4b of them is used for detection on the picture density, and the middle part of tubes of this part 3b is curved in the transverse direction, and the detection signal from photodetecting element 14 facing to the end part of these tubes is sent to operating means 15 to operate maximum and minimum levels, and the exposure light source is controlled through control means 16 on a basis of the output of operating means 15 so that the maximum electrostatic contrast is obtained. Further, on a basis of the output of operating means 15, the charging voltage is changed through control means 16 or the bias voltage of the developer is changed to adjust the density of the copying paper. |
