| 摘要 |
PURPOSE:To obtain a visible image which excels in the sharpness with no uneven development and in a high gradient, by securing the gap between the electrostatic holder and the development roller in such way that the surface of the nonpicture part has a contact at the picture part and no contact on the surface of the toner particle layer on the roller each. CONSTITUTION:A gap is secured between the electrostatic holder and the development roller 11, and the length of the gap is set larger than the toner coated layer on the roller 11. At the same time, a mutual friction charging is secured between the toner and the carrier via the stirring component. The magnetic roller 8 consists of the rotatable nonmagnetic sleeve 9 plus the magnet 10 fixed into the sleeve to form the magnetic brush along with the toner and the carrier and then transport the toner and the carrier. For the toner and the carrier transported, only the toner sticks onto the surface of the roller 11 at the position where the toner and the carrier touch or approximate to the roller 11 and by the repulsive power between the toners themselves and the reflection force together. In such way, a high-contrast picture can be obtained with no uneven development and a high gradient. |
