| 摘要 |
PURPOSE:To always stabilize the density on a transfer material. CONSTITUTION:This multicolor image forming device having the arrangement of an electrifier 2, an exposure device 3, developing devices for plural colors 4, a transfer device 7 and a cleaning device 8 around an image carrier 1 is provided with a means developing a standard pattern for controlling the concentration of each color on the image carrier 1, a means directly transferring the developed standard pattern onto a transfer material carrier 15, a means 6 detecting the toner concn. of the standard pattern on the image carrier 1, a means 18 detecting the toner concn. of the standard pattern transferred onto the transfer material carrier 15, a means controlling the concentration of toner in the developing devices 4 with the toner concn. of the standard pattern on the image carrier 1 and a means controlling a transfer current value with the ratio of the toner concn. of the standard pattern on the image carrier 1 to that on the transfer material carrier 15. |
