Browse Prior Art Database

Multinozzle Ink Jet Head With Common Bias

IP.com Disclosure Number: IPCOM000088722D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Albrecht, DW: AUTHOR

Abstract

A multinozzle ink jet print head is shown.

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Multinozzle Ink Jet Head With Common Bias

A multinozzle ink jet print head is shown.

The print head generates a plurality of streams of ink drops 10 moving into the paper. The drops are selectively charged by signals to terminals 12 to place a voltage v or ground potential on associated charge electrode 14 at the time of drop breakoff. The drops are passed through a uniform electrostatic field produced between high voltage deflection plate 20 and ground deflection plate
22. Deflection plates 20 and 22 are positioned at an angle alpha to the direction of movement of the print head, as shown by the arrow. In Fig. 2, the angle alpha is 45 degrees.

A bias electrode 16 is positioned near the charge electrodes and a bias charge V or ground potential is selectively produced on all ink drops 10 by the bias source 18. In Fig. 2, the drop may acquire one of four charge states from the terminal 12 and the bias source 18 which generates a voltage synchronized to the data supplied to terminal 12 at one-half the frequency. The charge states v and V+v are for drops not to print, and these drops are deflected to the gutter. Uncharged drops 26 are not deflected and continue straight ahead for printing as also do bias-charged drops 24 which are deflected a small amount, as shown in the dotted lines.

As shown in Fig. 3, the apparatus can print any drop in the matrix shown, thereby providing a high resolution capability. It can be seen from Figs. 2 and 3 that some drops are used to...