| 摘要 |
In an image forming apparatus, a control circuit rotationally drives a development roller at a predetermined rotation speed during a development process, in which the development roller has depression portions and land portions on a circumferential surface. The depression portions and the land portions are oblique grooves in the surface. While the development roller is rotationally driven, the control circuit controls the predetermined rotation speed such that a crossing angle approximates 90°. The crossing angle is formed by a screen line in the electrostatic latent image on the circumferential surface of the latent image support and an area where the land portion of the development roller substantially passes over the circumferential surface of the latent image support.
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