Patent ID: 7822365

Claim:
An image forming apparatus comprising: a first image forming portions group including a plurality of image forming portions, which develops latent images on a plurality of image bearing members, respectively, with toners including yellow toner, magenta toner, cyan toner and black toner, a second image forming portions group including a plurality of image forming portions, which develops latent images on a plurality of image bearing members, respectively, with toners having colors different from yellow toner, magenta toner, cyan toner and black toner, an intermediate transfer belt on which images formed by the first image forming portions group and the second image forming portions group are transferred; tension members between which the intermediate transfer belt is stretched, wherein toner images formed by the first image forming portions group are transferred to a first belt face between the tension members, and toner images formed by the second image forming portions group are transferred to a second belt face between the tension members, wherein the number of the image bearing members facing the second belt face is smaller than the number of the image bearing members facing the first belt face, and the interval between neighboring image bearing members facing the second belt face is larger than interval between neighboring image bearing member facing the first belt face; and a first exposing member having a plurality of laser sources provided for the image bearing members of the second image forming portions group and a first rotary polygon mirror that scans the image bearing members of the second image forming portions group, respectively, with laser beams from the laser sources, wherein the first rotary polygon mirror is disposed at an end portion side of the second image forming portions in an aligning direction of the image bearing members of the second image forming portions group; and a second exposing member having a plurality of laser sources provided for the plurality of image bearing members of the first image forming portions group and a second rotary polygon mirror that scans the image bearing members of the first image forming portions group, respectively, with laser beams from the plurality of laser sources of the second exposing member, wherein the plurality of image bearing members of the first image forming portions group are disposed at both sides of an axis of the second rotary polygon mirror.