| 摘要 |
PURPOSE:To prevent photographic fog due to a toner and toner leak to the outside of a developing device by carrying a developer on a developer carrying guide member from a developer supply part to a developing area in accordance with rotation of a magnetic roller. CONSTITUTION:The developer is carried on a developer carrying guide member 12 from a developer supply part A to a developing area B by only rotation of a magnetic roller 11 and is brought into contact with the surface of an electrostatic latent image carrier in the front end of the developer carrying guide member 12 to develop an electrostatic latent image. Simultaneously, the developer is brought into contact with the outside peripheral surface of a developing sleeve 10 and is carried between the developing sleeve 10 and the developer carrying guide member 12 toward the developer supply part A in accordance with rotation of the developing sleeve 10. In this case, contacting of the developer to the surface of the electrostatic latent image carrier is terminated in the position where the developing sleeve 10 approaches the surface of the electrostatic latent image carrier or a position X1 where the developing sleeve 10 is most approximate to said surface. The surface of the electrostatic latent image carrier whose contacting to the developer is terminated passes said position X1 where an electric field is strong, and the toner floating in this part is stuck to an electrostatic latent image part or the outside peripheral surface of the developing sleeve 10 by the strong electric field.
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