| 摘要 |
PURPOSE:To provide an image density controller generating a high quality image whose output density is equal to a reference density signal with less repetitions for control, even if the characteristic of an electrophotographic process is fluctuated by an environmental change. etc. CONSTITUTION:The charged voltage of an electrifying scorotron 100 and the developing bias voltage of a subsystem for developing 104 are control-inputted and, the manipulated variable of the control input is calculated based on a gain function by a manipulated variable calculator 206 and the control input is updated by a control input updating part 208 based on the value of the calculation, to control the density of an output image. At this time, the relation between the control input and the output density is experimentally obtained in advance, one or more the gain functions describing the relation between the manipulated variable of the control input and the variation of the output density are experimentally obtained and stored in a gain function storage part 302 and the gain function is selected or corrected based on the output density or a control history, to obtain the gain function most suitable for the characteristic of a process at present. |
