CONTROLLABLE CURRENT SOURCE FOR IONOGRAPHIC HEADS
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
An ionographic print head, similar to that described in U.S. Patent No. 5,081,475 to Frank et al. (Issued Jan. 14, 1992) typically employs a wire corotron ion source and an array of voltage controlled nibs that modulate ion current flowing through a slit or outlet channel to a receiving surface. The output ion current at each slit is a function of nib voltage, air velocity, geometry and the corotron emission level. When the corotron is operated from a voltage source the corotron emission current is a steep function of applied voltage over threshold, and is very sensitive to small changes in the discharge gap geometry, including the changes caused by mechanical vibrations of the corotron wire.