Patent ID: 9034551
Filing Date: 2015-05-19
Classification: G03G

Abstract:
1. A two-component developer, comprising: a magnetic carrier obtained by coating a magnetic core with a resin; and toner, wherein: the magnetic core contains at least a ferrite component and SiO a ratio of a length of a longest straight line among straight lines drawable on the ferrite component observed in a reflected electron image photographed with a scanning electron microscope to a maximum diameter of the section of the magnetic core in the reflected electron image is 50% or more and 85% or less; a content of SiO the magnetic core has a specific resistance of 5.0×10 the magnetic carrier has an intensity of magnetization in 79.6 kA/m of 40.0 Am the toner has a weight-average particle diameter (D4) of 3.0 μm or more and 10.0 μm or less and an average circularity of 0.940 or more and 0.990 or less: measurement conditions: upper and lower portions in a cylindrical resin container having a measuring space with a sectional area of 2.4 cm