| 摘要 |
<p>The present invention provides an image forming apparatus that suffers less toner particles scattering and a narrower variation in image density. In this image forming apparatus (2), a decrease of a contrast potential difference can be compensated by means of a developing bias voltage generator circuit (126) and a grid bias voltage generator circuit (124), so that the image density can be kept constant. The apparatus has a developing mechanism in which the respective average particle diameters of carrier members and toner particles, toner concentration, and the diameter and peripheral speed of a developing roller are optimized. Although the diameter of the developing roller is small, therefore, a high image density can be secured, and the value of toner particles scattering can be lowered. <IMAGE></p> |
