The image forming process of photoconductive toner

To obtain a good image using a photoconductive toner, the potential acceptability of the photoconductive toner layer may exceed 2.5 or preferably 3.5 V/g/m(2) and the residual potential after exposure may not exceed 20 V. The potential acceptability increases with toner sprinkling density and approaches a definite value. The initial potential increases proportional to the toner sprinkling density and the residual potential increases superlinearly. The residual potential per unit initial potential has a minimum against a definite value of toner sprinkling density, and the photoconductive toner layer has desirable potential acceptability and residual potential around this value, so that a good image is obtained. In general this value lies between 80-120 g/m(2). The electrostatic powder sprinkling method gives higher potential acceptability and lower dark decay rate than the post charging method, but no significant difference in light sensitivity. A good developing result is obtained with an air jet which has a narrow velocity distribution and is blown against the photoconductive layer at an angle near 90 degrees . Air velocity between 15-20 m/sec just on the layer gives a good result.