Electric Field Shunting in Aspirated Ink Jet Printers
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
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.