| 摘要 |
PURPOSE:To prevent a void by using a high resistance carrier provided with a resin layer on the surface of a conductive core material as two-components containing developer, and meeting prescribed requirements among a light potential, a dark potential and a video bias potential on a photosensitive body where a digital electrostatic latent image is formed. CONSTITUTION:An organic photosensitive body drum is used as a photosensitive body 10, and its surface is electrified at, for instance, -800V by a scorotron charger, the digital electrostatic latent image is formed by binary optical scanning from a laser writer whose light source uses a laser diode. Here, the light potential is -100V. Dry two-components containing developer with said high resistance carriers is used, and electrified potential of the photosensitive body is set as follows; the dark potential VD is, for instance, -680V, the light potential VL is -80V and the bias voltage VB is -500V, to form the image formed. Here, a parameter (VB-VL)/(VD-VB) is 2.03, and the rank of a void can be improved to the rank 4.5. |
