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ELECTROSTATIC INK JET GUTTERS

IP.com Disclosure Number: IPCOM000024878D
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

In synchronous Rayleigh-type ink jet printing, charged ink droplets are directed to a recording medium along controlled trajectories to cause those ink droplets to strike the medium at desired locations. To encode the print medium with information, certain ones of droplets are diverted from the print medium to leave blank areas. One prior art ink jet printing architecture involves a drop charging technique wherein uncharged droplets strike a gutter for recirculating the ink droplets back to the drop generator and charged droplets are deflected in their trajectory away from the droplet gutter to strike the print medium.

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XEROX DISCLOSURE JOURNAL

ELECTROSTATIC INK JET GUTTERS Proposed Joel M. Pollack Classification

U.S. Cl. 346/75 Int. C1. Gold 15/18

In synchronous Rayleigh-type ink jet printing, charged ink droplets are directed to a recording medium along controlled trajectories to cause those ink droplets to strike the medium at desired locations. To encode the print medium with information, certain ones of droplets are diverted from the print medium to leave blank areas. One prior art ink jet printing architecture involves a drop charging technique wherein uncharged droplets strike a gutter for recirculating the ink droplets back to the drop generator and charged droplets are deflected in their trajectory away from the droplet gutter to strike the print medium.

It has been observed that for a variety of reasons, ink droplets intended to just miss the gutter in their trajectory toward the print medium can instead strike the lip of the gutter. Conversely, some gutter droplets which are intended to strike the gutter can miss their intended target and instead strike the paper. This misdirection of ink droplets can be caused by poor phasing of charging signals and/or aerodynamic effects caused during ink droplet flight. One solution to the slight misdirection of ink droplets in their trajectories toward either the print medium or the gutter is to slightly energize the ink droplet gutter. In this proposal, it is assumed, therefore, that the gutter is made from a conductor or slightly conductive material to which a field creating voltage can be eff...