| 摘要 |
PROBLEM TO BE SOLVED: To provide a device equipped with a single-layer type photoreceptor drum the sensitivity deterioration of which is restrained even in the case exposure is small when a photoreceptive layer becomes a thin film, made excellent in gradation expression over a long term and capable of forming a high-quality image free from the lowering of image density. SOLUTION: This image forming device is provided with the organic photoreceptor drum on which an electrostatic latent image is formed, and at least an electrifying means for electrifying the surface of the organic photoreceptor drum to be positive, an exposure means, a reversal developing means and a transfer means on the outer periphery of the photoreceptor drum. In the device, the exposure means has a driving circuit for multi-valued modulation equal to or above the binary one, and the photoreceptor drum is equipped with a single photoreceptive layer consisting of binder resin incorporating at least a charge generating agent, a Hall transporting agent and an electron transporting agent on conductive base substance, and the weight ratio of the electron transporting agent to the Hall transporting agent is >=0.7. |
