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The Image Forming Process of Photoconductive Toner

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Abstract

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/m2 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/m2. 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°. Air velocity between 15–20 m/sec just on the layer gives a good result.

© 1969 Optical Society of America

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