Full wave rectification apparatus for operation of DC corotrons

Claim 1

An electrostatographic machine comprising an imaging member including an imaging surface on which latent electrostatic images are formed including a conductive layer having means for coupling to an electrical potential, development means for developing the latent image with a toner material to form a toner image corresponding to the latent image, a DC transfer corotron including at least one wire spaced from the conductive layer of the imaging member for establishing a corona generating electric field between them for depositing electrostatic charge on the backside of a support member adjacent the imaging surface for transferring a toner image from the imaging surface to the front side of a support member and power supply circuit means coupled to the corotron for applying to it an unfiltered, full wave rectified AC voltage having an amplitude that exceeds a threshold level for corona generation from about 40 to about 80 percent of its wavelength for creating transfer and stripping electric fields capable of compensating for variations in a support member including variation in thickness and moisture content wherein transfer fields are those associated with the transfer of toner images to a support member and stripping fields are those associated with separating a support member from adjacent the imaging member after charge is deposited on the backside of the support member.