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Modified Selector for Magnetic Ink Jet Printing

IP.com Disclosure Number: IPCOM000085152D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Lo, DC: AUTHOR [+2]

Abstract

In magnetic ink jet printing systems the selector is designed to select a single droplet at a time for printing or not printing purposes, dependent upon the other system control electronics. There is, however, a magnetic force applied to the droplets adjacent the selected droplet due to the "fringing field" effect.

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Modified Selector for Magnetic Ink Jet Printing

In magnetic ink jet printing systems the selector is designed to select a single droplet at a time for printing or not printing purposes, dependent upon the other system control electronics. There is, however, a magnetic force applied to the droplets adjacent the selected droplet due to the "fringing field" effect.

Fig. 1 illustrates a selection-deflection system which compensates for the fringing field effects of the selector. A parallel gap deflector 2 has pole pieces having a gap separation of 2 Lambda. A selector 4 is positioned perpendicular to the top surface of the deflector 2 and centered 1 Lambda from each of the pole pieces.

A stream of ink droplets 6 are travelling in the direction of arrow 8 towards a printing medium, not shown. Assume that the selector 4 is selecting the droplet 10 for printing purposes. A magnetic field generated by the selector 4 tends to pull the droplet 10 towards the selector 2, and the fringing field tends to pull, to a lesser extent, the adjacent droplets 12 and 14 towards the selector.

The parallel gap deflector 2 produces a magnetic force, as illustrated in Fig. 2, with the force being greatest at the points 16 and 18 which are in alignment with the droplets 12 and 14, and which is the least at a point 20 which is in alignment with the droplet 10.

Accordingly, the magnetic force produced by the deflector 2 tends to pull the droplets 12 and 14 in a downward direction towards the...