Patent ID: 6258502
Filing Date: 2001-07-10
Classification: G03G

Abstract:
A two-component developer comprising at least a magnetic carrier and a toner wherein:said magnetic carrier comprises magnetic carrier particles with an average particle diameter of 35 .mu.m to 100 .mu.m, andsaid toner comprises toner particles with a weight-average particle diameter of 6.0 .mu.m to 11.5 .mu.m, to which at least one additive is externally added thereto in an amount of 0.3 to 1.5 wt. % to said toner, said toner particles comprising (a) toner particles with a particle diameter of 5 .mu.m or less with a content ratio of 15% or less by number, and (b) toner particles with such a particle diameter that is two times or greater than the weight-average particle diameter of said toner particles with a content ratio of 5% or less by volume, said toner particles satisfying a relationship of 0.60.ltoreq.D25/D75.ltoreq.0.85, wherein D25 is a number-average particle diameter when said toner particles reach a cumulative particle number of 25% in a cumulative undersize particle number distribution thereof, and D75 is a number-average particle diameter when said toner particles reach a cumulative particle number of 75% in a cumulative undersize particle number distribution.