Deflection Electrode Structure for Aspirated Ink Jet Printers
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Aspirated ink jet printers employ air movement at approximately the same velocity as the ink movement through a tunnel, which avoids the necessity of making corrections for aerodynamic problems in the ink stream. However, the use of the air stream creates problems of its own. During start up and shut down of the ink stream, splatter is likely to occur in the tunnel, for example, in the cross-hatched portion 30 illustrated in Fig. 4. Because deflection electrodes 13 and 14, which reside within the aspirator tunnel 10, create an electric field for ink drop deflection, any ink contamination on the sidewall of the tunnel between the deflection plates creates distortion of the deflection field which, in turn, degrades print quality. This article describes a scheme to minimize the contamination problem.