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CROSSTALK CORRECTION FOR IONOGRAPHIC HEAD HAVING SLIT APERTURES

IP.com Disclosure Number: IPCOM000026333D
Original Publication Date: 1991-Jun-30
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal

Abstract

Ionographic heads generally incorporate slits or holes for the ion exit aperture. The modulation elements in slit designs are placed close together, and as a consequence, the output ion current from each element suffers from signal crosstalk from neighboring elements. This is because the fields of each modulating element, or nib, partially extend into the space over their neighbors and influences their output. The degree of crosstalk can be reduced, for example, by reducing the exit slit width but at the cost of lowering net ion throughput. Individual exit ion holes do not suffer from this problem, but have other architectural and fabrication disadvantages and generally require higher modulation voltages. One solution is to predistort the applied nib modulating voltages to compensate for the crosstalk field. It has been shown that if the crosstalk coupling can be considered linear and the coupling only extends to a few nearest neighbors, the predistorted nib potentials that are required turn out to be a simple weighted sum of the straight input nib potentials, and only the nearest neighboring potentials are involved in the