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Aerodynamic Correction for Ink Jet Printing

IP.com Disclosure Number: IPCOM000088011D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Tamulis, JC: AUTHOR

Abstract

A stream 10 (Fig. 1) of writing fluid, such as conductive ink, is projected from nozzle 11 vibrated at fixed frequency by an electromechanical transducer 12. Signals to be recorded are applied to charging electrode 13 located at the point where individual ink drops 14 break from stream 10. The charged drops 14 are dispersed in accordance with their charge magnitude by deflection plates 15 and 16 for deposit on paper 17 or for interception by gutter 18.

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Aerodynamic Correction for Ink Jet Printing

A stream 10 (Fig. 1) of writing fluid, such as conductive ink, is projected from nozzle 11 vibrated at fixed frequency by an electromechanical transducer
12. Signals to be recorded are applied to charging electrode 13 located at the point where individual ink drops 14 break from stream 10. The charged drops 14 are dispersed in accordance with their charge magnitude by deflection plates 15 and 16 for deposit on paper 17 or for interception by gutter 18.

Due to the presence of drop patterns while in flight, drops 14 experience aerodynamic forces which cause incorrect placement on the paper 17. An aerodynamic correction is obtained by providing a pair of air nozzle plates 19 and 20 (Fig. 2) which, together with deflection plates 15 and 16, define an enclosed air space through which the stream of drops 14 moves. Controlled turbulence is introduced into the enclosed air space by jetting air through multiple orifices 21 located in plates 19 and 20.

The diameter D(a) (Fig. 3) of orifices 21 is in the order of a drop diameter in order to achieve the correct length scale of the turbulence in the drop flight region (e.g., 10-40 orifice diameters away). The intensity of air flow from the orifices 21 is in the order of 100-400 in/sec. for drops traveling around 1000 in/sec. The spacings X(N) and Y(N) f the orifices 21 must be experimentally determined in order to give homogeneous/isotropic turbulence in the plane of drop flight and...