Patent ID: 6517985
Filing Date: 2003-02-11
Classification: G03G

Abstract:
An electrophotographic developer comprising a toner and a carrier, the toner containing a spherical colored particles having an average shape factor (ML2/A) of about from 100 to 135 and irregular-shaped non-colored particles having a volume average particle diameter of about from 1 to 10 &mgr;m, wherein the developer has a charge distribution having a peak value Q/Ma ascribable to the spherical colored particles and a peak value Q/Mb ascribable to the irregular-shaped non-colored particles, the peak value Q/Ma and the peak value Q/Mb satisfying both the following formulae (1) and (2):20 &mgr;C/g&lE;|Q/Ma|&lE;85 &mgr;C/gâ€ƒâ€ƒ(1) âˆ’0.7 Q/Ma&lE;Q/Mb&lE;0.5 Q/Maâ€ƒâ€ƒ(2).