Patent ID: 8483585
Filing Date: 2013-07-09
Classification: G03G

Abstract:
1. A system for adjusting a selected operating parameter of an image forming device to control white vector based on selected environmental conditions, comprising: a photoconductive unit; a charging unit having a surface biased to a voltage operative to charge a surface of said photoconductive unit; an imaging unit forming a latent image on areas of said surface of said photoconductive unit by selectively discharging said areas of said surface thereof by illumination thereof, leaving non-discharged areas of said surface different from said discharged areas thereof; a developer roll having a surface biased to a voltage operative to develop toner to said latent image on said discharged areas of said surface of the photoconductive unit; a sensor mechanism for measuring selected environmental conditions of dry-bulb temperature and relative humidity; a control mechanism for reading said sensor mechanism to adjust said voltage bias of said charging unit by applying an offset thereto based on a wet-bulb temperature value so as to substantially minimize a white vector represented by the difference in potential between said non-discharged areas on said surface of said photoconductive unit and surface potential of said developer roll, the substantially minimizing being performed without enabling onset of development of toner background on said non-discharged areas of said surface of said photoconductive unit; and a memory connected to and accessible by said control mechanism and having stored therein lists of correlated values comprising a list of wet-bulb temperature values related to values of dry-bulb temperature and relative humidity measured by said sensor mechanism correlated to a list of voltage bias offsets related to the voltage bias of said charging unit to control said white vector.