Patent ID: 8874001

Claim:
An image forming apparatus, comprising: a photosensitive body that is configured to carry an electrostatic latent image on a surface thereof; a charge device that is configured to charge the surface of the photosensitive body; an exposure device that is configured to form the electrostatic latent image on the photosensitive body charged by the charge device; a development device that is configured to develop the electrostatic latent image formed on the photosensitive body by the exposure device so that a developer image is formed; and a transfer device that is configured to transfer the developer image formed on the photosensitive body by the development device on a print medium, wherein a positive charge dark decay rate of the photosensitive body is greater than a negative charge dark decay rate when a dark decay rate is expressed by  V ⁢ ⁢ 0  -  V ⁢ ⁢ 5   V ⁢ ⁢ 0  × 100 ⁢ ( % ) where V0 [V] is a surface potential of the photosensitive body immediately after a completion of the charging by the charge device, and V5 [V] is the surface potential when the photosensitive body is left in a dark place for 5 seconds immediately after the completion of the charging, wherein the positive charge dark decay rate is in a range from 2.8% to 4.7%, the negative charge dark decay rate is in a range from 1.8% to 3.3%, and the photosensitive body includes a topmost surface layer made of binder resin that includes polycarbonate resin formed by the following chemical formula: