Browse Prior Art Database

Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal


An ionographic imaging device which controls ion projection by shaped projection fields is described with reference to the drawings. Figures 1A and 1B show an enlarged cross sectional view of the modulation channel of the ionographic imaging head, wherein at least a portion of control electrode 28 extending through modulation channel 24 along thin film layer 40 supported on a planar insulating substrate 44 includes a resistive material segment 100. In the described embodiment, resistive material segment 100 is preferably a thin film deposited on the thin film layer 40 as by sputtering methods or the like, desirably in the same process as the remainder of the control circuit is fabricated. However, the resistive material layer may be a thin or thick film deposited on a substrate in a variety of methods. Conductive contacts 102 and 104 may be provided, connecting resistive material segment 100 respectively to switch 38 and power supply 106, held at reference voltage source VR, selected to provide an appropriate electric field configuration at the outlet end of the modulation channel. In at least one possible arrangement, VR may be equal to VH. However, as will become apparent, it is not necessary for VR to be equal to VH, and advantages may lie in careful selection of VR with respect to VH. In the drawing shown, VR