| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device capable of yielding a stable high-quality image excellent in reproducibility in both a primary color and a secondary color or yielding a stable high-quality image excellent in reproducibility in both a primary color and a secondary color even when the electrified charge amount of developer is changed because the number of image forming times is increased. SOLUTION: In this image forming device A equipped with a plurality of developing devices 4, 1st bias and 2nd bias are respectively applied to the developer carrier 23 and the developer electrifying member 26 of the respective developing devices 4 of the image forming device A, and a potential difference between the 1st bias and the 2nd bias in the developing device which performs image forming later is set to be larger than that in the developing device which performs image forming earlier. Then, the image forming device A is constituted to control the potential difference between the 1st bias and the 2nd bias in the respective developing devices 4 according to information in a storage means 30 for storing the using circumstances of the respective developing devices 4. |
