| 摘要 |
PURPOSE:To obtain a good image by stable control by adequately substituting absorptive members for detection light according to the colors to be controlled so as to always obtain reflection conditions for the adequate detection light thereby obtaining good detection sensitivity with the same detector regardless of the colors of developing toners. CONSTITUTION:The light absorptive member 3 is rotationally driven by the operation of a driving device 4 and the absorptive member 3b for the black toner is so prepd. and set as to contact a photosensitive body 1 side before a photodetector 2 is trigged to emit light when the reproduced color is judged to be black. A black toner detection mode is executed after such prepn. is carried out. On the other hand, the absorptive member 3 is so rotationally driven that the absorptive member 3a for the color toner of the absorptive member 3 contacts the photosensitive body 1 side when the set color is judged to be colors. The color toner detection mode is executed after such prepn. is carried out. |
