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Ink Jet Gutter Arrangement

IP.com Disclosure Number: IPCOM000080444D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Bloom, RD: AUTHOR [+4]

Abstract

In electrostatic ink jet printing, the printed droplets in a character stroke or bar carry different charges to produce the required deflection. When droplets are to be discarded, however, the charge differential between two droplets to be printed followed by a droplet to be discarded produces a charge interaction, which adversely affects the trajectory of the droplets to be printed.

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Ink Jet Gutter Arrangement

In electrostatic ink jet printing, the printed droplets in a character stroke or bar carry different charges to produce the required deflection. When droplets are to be discarded, however, the charge differential between two droplets to be printed followed by a droplet to be discarded produces a charge interaction, which adversely affects the trajectory of the droplets to be printed.

For example, in a series of droplets in which successive droplets 1 thru 8 are to be recorded in an upward scan, they are given charge voltages with each charge voltage being successively greater than the last in an amount, such as 14 volts. The droplets 9 thru 11 which are to be discarded are left uncharged, thus leaving an unbalanced electrostatic force between droplet 8 and 7 and droplet 8 and 9, causing misalignment of droplet 8.

Misalignment can be nearly eliminated by providing gutters for unwanted droplets at both ends of the deflection scan, as seen in the figure. The unwanted droplet adjacent to the last printed droplet of the scan can be disposed of while maintaining only a small unbalanced electrostatic force. In the example described, droplet 9 would be provided with a charge approximately 20 volts greater than droplet 8 and, as a result, be deflected into the upper gutter. Thereafter, droplets 10 and 11 which are to be discarded into the lower gutter are left uncharged.

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