| 摘要 |
PROBLEM TO BE SOLVED: To obtain an image of high quality free from a break of a fine line, irrespective of an environmental change such as a change in temperature and a change in humidity, etc., and a variation in the type of a recording paper such as the thickness of the paper and the material variation. SOLUTION: The image forming device is provided with a sheet absence state constant voltage transfer means C5 for executing a constant voltage transfer without carrying the recording sheet into a transfer area, a sheet absence state constant voltage transfer current detector SN1 for detecting the sheet absence state constant voltage transfer current which flows when the sheet absence state constant voltage transfer is executed, and an image forming parameter setting table C2T for storing the detection signal of the detector SN1 in accordance with divided detection ranges divided into plural detection ranges in accordance with the size of the detection signal and the set value of an image forming parameter for changing a developing contrast as a difference value between a current developing bias potential applied on the developing roll and the electrostatically charged potential of the electrostatic latent image. |
