| 摘要 |
PROBLEM TO BE SOLVED: To obtain a stable developing characteristic by performing binary development through the use of a developer carrier in which specific grains are dispersed in the front layer of a substrate made of a specific conductive material so as to expose at least a part of the specific grains to the surface of the front layer. SOLUTION: The substrate 3a of a developer carrier is made of a conductive material whose volume resistivity is <=10<5>Ω.cm and also binary development is performed by using the developer carrier in which grains 8 which are >=10<6>Ω.cm in the volume resistivity and <=20μm in the grain diameter (a) are dispersed on the front layer of the substrate 3a, so as to expose at least a part of the grains 8 to the surface 3b of the front layer. Therefore, a developing electric field between a latent image on a photoreceptor drum and the developer carrier can be stressed. Thus, even if a developing potential is changed, the concentration of the developing electric field on an optical writing dot on the photoreceptor drum is mitigated. Further, the volume resistivity of the grains 8 dispersed on the front layer is increased to suppress the concentration and also a developer supplied from a developer supplying member is triboelectrified to increase the supply rate of the developer. |
