Boldness control in an electrophotographic machine

摘要

Control over the placement of image edge location on the photoconductor of an electrophotographic machine providing for a range of discharge levels for edge picture elements (PELS) which vary from greater than, to less than, that level used for fully discharged PELS. Such control is achieved independently of machine parameter control by altering edge PEL illumination intensity in accordance with data representing desired edge PEL intensity as the photoconductor sensitivity changes. A system for measuring and controlling the fully discharged PEL level establishes a measurre of photoconductor sensitivity and is used for enabling the selection of current edge PEL intensity.