| 摘要 |
An image-forming apparatus for forming an image by electrically charging a photosensitive material, forming an electrostatic image through the exposure to light and developing the electrostatic image, wherein the main charged potential, Vo, of the photosensitive material, the potential, Vr, of the exposed portion of the photosensitive material and the developing bias potential DB are so set as to satisfy the following formulas,V1, V2 and V3 are parameters calculated from a developing characteristics curve obtained by plotting the image densities to a potential difference between the developing bias potential and the surface potential, 0 V, of the photosensitive material when the image is formed by changing the developing bias potential with the exposure amount being zero in a state where the potential on the surface of the photosensitive material is maintained at zero.
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