| 摘要 |
PURPOSE:To detect a stable and exact state of image formation and to properly control image formation by delaying detection action using a means for detecting image formation conditions. CONSTITUTION:Currents flowing from the conductive substrate Al 103 of a photosensitive drum to the ground, from it to the substrate Al 103 due to discharge with chargers 2, 4 through resistors R1, R2, diodes D1, D2 are measured, and sent a multiplexer MPX, an A/D converter Vc, etc. to CPU, and image formation conditions are detected. In this case, the CPU delays detection action in response to a built-in timer, and detects stabilized image formation conditions to control image formation, after the image forming means of the chargers 2, 4 and the photosensitive drum, etc. has started action, or changed output, and further prescribed time length has elapsed. Therefore, image formation is exactly controlled without being affected by scattering, etc. of characteristics of constituent parts. |
