Patent ID: 7250243

Claim:
A nonmagnetic one-component toner for an electrophotographic image forming apparatus, the toner comprising: toner particles including a binder resin, and a coloring agent, a charging control agent (CCA), and a release agent which are contained in the binder resin; and an external additive added to the toner particles, wherein the external additive comprises: approximately 0.1 to approximately 3.0 wt % of silica having a charge opposite to the toner particles; approximately 0.1 to approximately 3.0 wt % of silica having a same charge as the toner particles; and approximately 0.1 to approximately 4.0 wt % of titanium dioxide, wherein the silica having the charge opposite to the toner particles is large silica having an average particle size of approximately 30-200 nm, and the silica having the same charge as the toner particles is small silica having an average particle size of approximately 5-20 nm, wherein titanium dioxide includes approximately 0.1-2.0 wt % of hydrophobic titanium dioxide and approximately 0.1-2.0 wt % of conductive titanium dioxide, and wherein an average particle size of the hydrophobic titanium dioxide is approximately 5-50 nm, and an average particle size of the conductive titanium dioxide is approximately 30-500 nm.