Patent ID: 6083655
Filing Date: 2000-07-04
Classification: G03G

Abstract:
A developing method comprising the steps of:stirring a two component-type developer for electrophotography which contains at least a toner and a carrier in a developer container with a stirring screw;conveying said developer to a developing section with a conveying screw and a developer carrying member which has a structure rotating around an outer circumference of a fixed magnet core; anddeveloping an electrostatic latent image formed on an image holding member by forming a magnetic brush on a developing magnetic pole at said developing section,wherein said carrier is a magnetic material dispersion-type resin carrier which contains at least a binder resin and a metal oxide, and has a coercive go force H.sub.c of 20 to 300 Oe, and said carrier has been previously exposed and magnetized in a magnetic field which is larger than a maximum value of an intensity of a vertical magnetic field on a surface of the developer carrying member, andsaid developer carrying member has a surface shape which satisfies the following conditions:0.2 .mu.m.ltoreq.average roughness of centerline (Ra).ltoreq.5.0 .mu.m,10 .mu.m.ltoreq.average interval between concavity and convexity (Sm).ltoreq.80 .mu.m,0. 03.ltoreq.Ra/Sm.ltoreq.0.5,wherein the reference symbol Ra represents an average roughness of centerline as measured in compliance with JIS-B0601 and the reference symbol Sm designates an average interval between concavity and convexity as measured in compliance with ISO 468.