| 摘要 |
PURPOSE:To form a copy image with excellent color balance by measuring the amount of toner on an intermediate transfer body, and varying the efficiency of transfer from a photoreceptor to the intermediate transfer body or from the intermediate transfer body to transferring paper according to the measured value. CONSTITUTION:The photosensitive drum 1 is exposed to an original picture which is color-separated by a color separation filter 10 and its latent image is developed 18 with toner in corresponding colors. The developed images are positioned and transferred successively to a picture carrier sheet 222 supported on the surface of a transfer drum 22 by the 1st transfer corona electrifier 221 in the transfer drum 22, forming a multicolor picture. The densities of patch images in colors Y, M, and C formed outside of a copy picture area are detected and the high voltage power source 37 of the electrifier 221 and the grid bias power source 38 of a before-transfer electrifier 19 are controlled on the basis of the measured values. The multicolor picture on the transfer drum 22 is transferred 28 to the transferring paper 25 at a time. |
