Control of a xerographic process by adjustment of the photo receptor potential in a function of the photo receptor segments

摘要

An image processing apparatus having a corona device with a charging grid for charging a photoreceptor to voltage levels, a developer for applying toner to the photoreceptor, and a corona control responsive to the signal for charging the photoreceptor by adjusting the photoreceptor voltage levels in relation to discrete photoreceptor segments. The adjustment of voltage levels is done by providing signals from a sensor in response to developing a series of test patches on the photoreceptor, relating the signals from the sensor to a given test patch, associating each of the test patches to a given segment of the photoreceptor, and adjusting the charging grid to a given voltage for each segment of the photoreceptor in response to the signals from the test patches on the photoreceptor.