Non-contact corona charging of a small radius moving surface to a desired
surface voltage with a single corona charging system with a first corona
generator applying a first charge through a screen grid having a first
bias voltage to initially charge the surface to more than half of the
desired voltage, and then a second corona generator applies the remainder
of the desired surface charge through a separate screen grid having a
second bias voltage. The two corona generators may be spaced pin arrays
angled relative to one another and substantially perpendicular to their
adjacent moving surface areas. The two screen grids may be electrically
planar and angled relative to one another, substantially parallel to
their adjacent moving surface areas.