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Reducing Drop Misregistration from Differential Aerodynamic Retardation in a Linear Ink Jet Array

IP.com Disclosure Number: IPCOM000083054D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Fisher, DE: AUTHOR [+2]

Abstract

Differential aerodynamic retardation causes progressive drop velocity reduction from the center to either edge of an ink jet array. This results in relative misregistration of drops.

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Reducing Drop Misregistration from Differential Aerodynamic Retardation in a Linear Ink Jet Array

Differential aerodynamic retardation causes progressive drop velocity reduction from the center to either edge of an ink jet array. This results in relative misregistration of drops.

The figure shows an array of ink drops in flight to a paper 4 which is to be printed upon. The deflection signal which is applied to all ink jets simultaneously is the same, however, the placement of drops becomes curved. At close to the source, the drops 2 are in line, however, near to the paper the drops 6 are curved at the point nearest the edge of the paper 4.

The cause of the retardation of the drops near the edge of the paper relative to those near the center is caused by aerodynamic drag. All drops experience a velocity reduction during flight, but the effect is more pronounced near the array edges, where the drops are less shielded from the ambient air.

The consequence of aerodynamic retardation is that drops near the array edge strike the paper at a later time than do drops near the center. The printed array which results is a curved rather than a straight line as desired.

One method to correct for the effect of retardation has deflection information applied to the outer droplets in the streams, at a predetermined time earlier than the deflection signal is applied to the drops near the center. This results in a curvature opposite to that caused by aerodynamic retardation, howeve...