Patent ID: 7689150

Claim:
An image forming apparatus, comprising: an image carrying member which is adapted to carry an electrostatic latent image; a developer container which is adapted to contain a developer including a toner, a carrier for charging the toner, and opposite polarity particles to be charged opposite to a charge polarity of the toner; a developer carrying member which is adapted to convey the developer supplied from the developer container; a toner carrying member which is adapted to receive the toner from the developer on the developer carrying member and to convey the toner to a development position facing the image carrying member to develop the electrostatic latent image on the image carrying member; and an electric field forming section which is adapted to form an electric field between the image carrying member and the toner carrying member, the electric field including a DC component overlapped with an AC component, wherein the AC component of the electric field formed by the electric field forming section includes a trapezoidal wave.