DEVELOPER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT, AND ELECTROPHOTOGRAPHIC DEVELOPING METHOD USING DEVELOPER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT, AND METHOD FOR ELECTROPHOTOGRAPHIC DEVELOPMENT USED FOR DEVELOPER MANUFACTURING CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT USED FOR DEVELOPER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT

摘要

PPROBLEM TO BE SOLVED: To provide a developer which has good dot reproducibility, good graininess in highlight portions, has a decreased edge effect, makes high image quality of reduced scumming obtainable, and hardly gives rise to carrier sticking, a developer container in which the developer is housed, an image forming device which is mounted with the container and further, a method for manufacturing a carrier. PSOLUTION: The developer for electrophotographic development is prepared by mixing toner particles containing at least a binder resin and coloring matter and having a weight average grain size Dt of 8 m, and a carrier. The weight average grain size of a carrier core material constituting the carrier is 20 to 45 m, and the content ratio of the particles below 44 m in grain size in the carrier core material is 80wt% and the content ratio of the particles below 22 m in grain size is 5.0wt%. Further, the magnetic moment at 1 KOe of the carrier core material is 40 emu/g. A high-resistance coating layer is formed on the surface of the carrier core material and a low-resistance coating layer B is formed thereon. PCOPYRIGHT: (C)2004,JPO