| 摘要 |
PURPOSE:To increase an amount of developer attached to an electrostatic latent image, by forming ferromagnetic protuberances on the outer circumference of a developing sleeve to give a high magnetic field. CONSTITUTION:Magnetic force lines produced from a magnet 15 are converged to the protuberances 13a of a magnetic body layer 13 on a developing sleeve 9, resulting in gathering a developer consisting of a carrier 2 and a toner 21 carried with it to the tips of the protuberances 13a. Since the protuberances 13a is nearest to a photoreceptor 4, a high electric field is obtained there, the developer is concentrated in the high electric field, and even if an amount of developer carried is small, an enough amount of toner can be attached to a latent image. |
