| 摘要 |
PURPOSE:To permit development at a high image density and high development efficiency without having fogging, ghost images, uneven sweeping patterns and negative characteristic by specifying the number of bristles per mm<2> on the surface of a developer carrying member in a development section, the height of the bristles in the development section and the relation of the nearest distance between a latent image carrier and the developer carrier. CONSTITUTION:The conditions 1.7<=(X/Y)<=7.0 and 4.9(X/Y)<-1.8=Z<=18.3(X/Y)<-0.9> and Z<=6.5 are satisfied where the number of the bristles per mm<2> on the surface of the developer carrying member (developing sleeve 22) in the development section is assumed as Z, the height of the bristles 51 in the development section as X and the nearest distance between the latent image carrier 1 and the developer carrier 22 as Y. Toner particles 37 and carrier particles are mixed and agitated on the developer carrying member 22. The development characteristic is thereby improved and the developing device having the high development efficiency and high density is obtd. |
