| 摘要 |
PURPOSE:To enble an image superior in contrast and free from fog by supplying a photoconductive toner specified in average paticle diameter on a conductive substrate, forming a uniform toner layer on the surface of the substrate, uniformly electrostatically charging and exposing it to form a latent image. CONSTITUTION:The toner 1 having an average particle diameter of <=6mum and, e.g., natetively charged, and a carrier are attached to a magnetic sleeve 2. Bias voltage 4 reverse in porality to the charge of the toner 1 is applied to the substrate 3, and the charged toner 1 is unifomly supplied to the substrate 3 by the electrostatic attraction as the sleeve 2 rotates. When the toner layer 10 on the substrate 3 is uniformly charged, e.g., with a corona charger 5, and imagewise exposed to form an electrostatic latent image. The exposed part of the toner layer 10 is made conductive to rapidly attenuate the surface potential. As a result, the charging characteristics of the toner and its photoresponsitivity are enhanced remarkably, and an image superior in contast and free from fog can be obtained. |
