Patent ID: 7265768

Claim:
A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images, wherein said apparatus includes a control section that is configured to decrease color mixture or exposure error based on controlling an exposure resolution, wherein said apparatus is a 4-drum tandem image forming apparatus comprising four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; and exposure resolutions Ry, Rm, Rc, and Rk are configured to satisfy conditions of Rk≦Rc≦Rm and Rm>Rk, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively.