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Electric Field Shunting in Aspirated Ink Jet Printers

IP.com Disclosure Number: IPCOM000052733D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Pan, RF: AUTHOR

Abstract

In aspirated ink jet printing, ink drops are charged by a charge electrode, and then passed into a tunnel, such as the tunnel 10 illustrated schematically in Figs. 1 and 2, air simultaneously entering the tunnel and traveling coextensively with the charged ink drop stream and then approximately the same velocity so as to reduce aerodynamic effects. It has been discovered that the charge drops, before they reach the tunnel, tend to interact with the high potential deflection field, causing the drops to either go towards or away from the gutter (which receives the non-printing drops). It has been found, that this is due to the interaction of the charge electrode with the higher or lowest potential charging the end cap 11 about which the air stream enters to mix with the ink drops 12.

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Electric Field Shunting in Aspirated Ink Jet Printers

In aspirated ink jet printing, ink drops are charged by a charge electrode, and then passed into a tunnel, such as the tunnel 10 illustrated schematically in Figs. 1 and 2, air simultaneously entering the tunnel and traveling coextensively with the charged ink drop stream and then approximately the same velocity so as to reduce aerodynamic effects. It has been discovered that the charge drops, before they reach the tunnel, tend to interact with the high potential deflection field, causing the drops to either go towards or away from the gutter (which receives the non-printing drops). It has been found, that this is due to the interaction of the charge electrode with the higher or lowest potential charging the end cap 11 about which the air stream enters to mix with the ink drops 12.

For example, in Fig. 1, if the upper deflection electrode 13 is charged at, for example, 3000 volts, the end cap 11 assumes a positive potential, and depending upon the charge on the particular charged ink drops 12, the drops will be deflected toward or away from the deflection electrode at the entrance of the tunnel. Moreover, if the charge, as illustrated in Fig. 2, is on the lower deflection electrode at, for example, a negative 3000 volts, the charged ink drops tend to move toward or away from that potential and once again cause interaction which effects their position at the entrance to the tunnel rather than as the drops pass ...