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Deflection System Providing an Equal Geometry for Each Stream to Minimize Aerodynamic Effects

IP.com Disclosure Number: IPCOM000083643D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Lane, R: AUTHOR

Abstract

The aerodynamic interaction between droplet streams in ink jet arrays results in nonuniformity of drop velocity. This is most noticeable in the outermost droplet streams, which have a slower drop velocity than the droplet streams in the interior of the array. This results in misregistration of the droplets on the printing medium.

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Deflection System Providing an Equal Geometry for Each Stream to Minimize Aerodynamic Effects

The aerodynamic interaction between droplet streams in ink jet arrays results in nonuniformity of drop velocity. This is most noticeable in the outermost droplet streams, which have a slower drop velocity than the droplet streams in the interior of the array. This results in misregistration of the droplets on the printing medium.

Fig. 1 illustrates plates 2 and 4, with plate 2 having ribs 6 and 8 formed therein and plate 4 having ribs 10 and 12 formed therein. With the plates joined together as illustrated, the spacing between ribs 6 and 8 is on the order of 10 mils, and the width of a given rib is on the order of 1 mil.

The slots between the respective ribs provide paths for droplet streams 14, 16 and 18 which are provided from an ink jet head, not shown. Since the ribs isolate adjacent streams from one another, the aerodynamic interactions are eliminated or at least substantially reduced. Accordingly, this results in velocity uniformity between the respective streams. A vacuum duct 20 may be included between the plates 2 and 4 for removal of any accumulated fluid in the structure.

Fig. 2 illustrates a front view of the plate 4, including a deflection plate 22 for deflecting droplets, which are not used for printing, to a gutter, not shown. It is to be appreciated that a plurality of the plates 2 and 4 may be used for fabricating an ink jet deflection structure.

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