| 摘要 |
In an image forming apparatus, a cylindrical back electrode roller is rotatably disposed at the upper side of an aperture electrode member, and a toner carry roller of a toner supply device is disposed along the longitudinal direction of the aperture electrode member at the lower side of the aperture electrode member. The aperture electrode member includes an insulating sheet, two arrays of apertures formed in the sheet, and control electrodes of approximately 1 mu m thickness, each of which is formed at the edge portion of the opening of each aperture on the sheet. Representing a line connecting the center of the toner carry roller and the center of the back electrode roller by L, the center portion of the gap between the two aperture arrays is set to locate on the line L. So, print density can be improved, and an image can be formed with high image quality.
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