abstract |
An object of the present invention is to provide an image forming apparatus capable of forming a good image by always uniformly charging toner. A developing unit (59) mixes a toner and a carrier while generating microplasma. The average particle size of the toner is 3 to 8 μm, the average particle size of the carrier is 20 to 60 μm, the axial torque of the stirring and conveying screws 52 and 53 is 0.1 to 0.3 (kgf · cm), and the developer carrier The toner is charged by regulating the layer thickness using the developer regulating member 56 above. The microplasma has ultraviolet rays / electrons / ions and is formed within a radius of 100 μm of a portion where the toner and the carrier come into contact. [Selection diagram] Fig. 1 |