| 摘要 |
PURPOSE:To obtain developed images of high quality which are not changed with time neither environmentally, by providing a drag generating means which generates a drag due to non-electrostatic force in the direction opposite to the flying direction of a developer so that flying of the developer can be controlled. CONSTITUTION:A developer 8 is a conductive toner and is formed into a single developer layer on a developer carrier 5 and is carried to a developing area, and the electric charge having a polarity opposite to that of an electrostatic latent image 2 is induced in this area under an electric field formed between an electrostatic latent image carrier 1 and the developer carrier 5, and the developer 8 is transferred to only an image part to terminate the development. Further, a non-electrostatic developing drag is given in the direction opposite to the direction, in which the developer tries to fly by the induced electric charge, in the developing area for the purpose of controlling the flying of the developer. By this method, the quantity of the electric charge is not varied among individual toner particles and is not varied by secular change, environmental change, or the like, and a required and sufficient quantity of the developer is always transferred, thus preventing the disturbance of developed images, the occurrence of photographic fog, the variance of density, etc. together with the secular change and the environmental change. |
