| 摘要 |
A developing agent image is formed by adhering a developing agent onto an electrostatic latent image formed on an image holding material (11) and transferred onto an image forming medium (19<5>), thereby forming an image. The ratio of a resistance value of a transfer member (30) arranged so as to face the image holding material when a voltage 1000 ÄVÜ is applied to the transfer member to a resistance value when a voltage 500 ÄVÜ is applied, is set to (0.5 ≤ ratio ≤ 0.89). Likewise, the ratio of a resistance value when 2000 ÄVÜ is applied to that when 1000 ÄVÜ is applied, is set to (0.3 ≤ ratio ≤ 0.88). Since just enough transfer current is optimally generated by such an elastic semiconductive contact roller (30), image quality can be improved using an image forming apparatus which does not need a large-capacity power source of more than 5kV, controlling the transfer of a toner image in steps of at least 1 mu A and 6V and providing a minimum transfer current of more than 10 mu A even at low temperature (10 DEG C) and low humidity (20%). <IMAGE> |
