Electrophotographic image forming apparatus

An electrophotographic image forming apparatus, comprising:

• a photoconductor body which moves at a predetermined process speed having an electrostatic latent image on a surface of the photoconductor body;
• a donor roller which moves by facing the photoconductor body in a direction equal to or opposite to a moving direction of the photoconductor body and develops the electrostatic latent image on the surface of the photoconductor body by using charged toners electrostatically carried on a surface of the donor roller;
• and
• a development nip section formed between the photoconductor body and the donor roller by having a predetermined gap between the photoconductor body and the donor roller;
• wherein
• a developing traveling-wave electrode for generating a traveling-wave electric field is disposed at a position facing the surface of the donor roller at an upstream side of the moving direction of the photoconductor body relative to the development nip section separated from the donor roller;
• and
• a traveling direction of the traveling-wave electric field from the developing traveling-wave electrode is toward a side of the development nip section.