| abstract |
An image forming apparatus of the present invention includes a bias power supply for applying a bias V B to a developer carrier on which a developer is deposited. A charge potential deposited on an image carrier, which faces the developer carrier for forming a latent image thereon, is 400 V or below in absolute value. Assume that the potential of the image carrier is lowered to V L after exposure, that a development potential is |V B −V L |, that the maximum set value of the development potential for development is |V B −V L |max, and that the development potential varies in a range satisfying relations:n n| V B −V L |≦|V B −V L |max+| V B −V L |max×0.2 n n| V B −V L |≧|V B −V L |max−| V B −V L |max×0.2 n n| V B −V L |max≦300 V n nThen image density varies by a width of 10% of image density corresponding to the maximum set value of the development potential or less. |