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Ink Jet Deflection Plate Arrangement

IP.com Disclosure Number: IPCOM000077318D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

West, DL: AUTHOR [+2]

Abstract

The deflection structures maximize deflection sensitivity in order to shorten the flight path of ink drops. To achieve the best control of drop placement, the aerodynamic effects and the drop-to-drop charge interaction effects must be minimized. Both are reduced by shortening the flight distance from the point where drops enter the deflection field to the surface of impact 5.

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Ink Jet Deflection Plate Arrangement

The deflection structures maximize deflection sensitivity in order to shorten the flight path of ink drops. To achieve the best control of drop placement, the aerodynamic effects and the drop-to-drop charge interaction effects must be minimized. Both are reduced by shortening the flight distance from the point where drops enter the deflection field to the surface of impact 5.

The drops are preferably maintained in the highest possible deflection field at all times. Upper deflection plate is conformed to the path of drops charged to give the greatest deflection possible. Experiment shows this path to be circular or nearly so.

To allow the deflection plates to be as close as the ionization potential of air will permit at the point where the drops enter the deflection field just past charge coil 3, insulating layers 4a and 4b are placed on plates 1 and 2, respectively, to prevent arcing, which can otherwise occur at less than ionization potential.

Since small particles of ink bounce back from the surface of impact 5 and carry a small negative charge, they are attracted to the positive deflection plate 1. The area 12 of plate 1 near the surface of impact is not insulated. Otherwise a charge build up would occur which would reduce the deflection field density. Lower deflection plate 2 is at ground potential and offers no attraction to the reflected droplets.

Shield 7 has a narrow slit 7a to allow passage of the primary drops but pr...