| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a sharp image having excellent gradation without causing an edge effect, decrease in the image density and fog even when a color original in a large image size is continuously copied and to maintain a sharp image even after lots of images are copied. SOLUTION: This carrier is produced by adding a capacitor component on the surface of magnetic carrier core particles having a ferrite component expressed by the formula (Fe2 O3 )x (A)y (B)z in such a manner that the electrostatic capacitance of the carrier determined by the measurement of the dependence of the impedance on the frequency of voltage applied under conditions of sinusoidal AC voltage with 2KV amplitude is between >=10<-15> F and <=10<-11> F. In the formula, A represents MgO, AgO2 or their mixture, B represents Li2 O, MnO, CaO, SrO, Al2 O3 , SiO2 or their mixture, and (x), (y), (z) are weight ratios satisfying 0.2<=x<=0.95, 0.005<=y<=0.3, 0<z<=0.795, and x+y+z<=1, respectively.</p> |
