Patent ID: 8275296

Claim:
An image forming apparatus comprising: a first image supporting member for forming a first static latent image thereon; a second image supporting member for forming a second static latent image thereon; a first developer supporting member disposed to abut against the first image supporting member for attaching developer to the first static latent image to form a first developer image in a first color; a second developer supporting member disposed to abut against the second image supporting member for attaching developer to the second static latent image to form a second developer image in a second color; a first transfer member disposed to face the first image supporting member for transferring the first developer image on the first image supporting member to a medium; a second transfer member disposed to face the second image supporting member for transferring the second developer image on the second image supporting member to the medium; and a voltage applying unit for applying a first voltage to one of the first developer supporting member and the first transfer member and a second voltage to one of the second image supporting member and the second transfer member, wherein said voltage applying unit is arranged to apply the second voltage greater than the first voltage to one of the second developer supporting member and the second transfer member when a printing operation is performed to form a first image on a medium in the first color and not to form a second image on the medium in the second color.