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Two Dimensional Magnetic Ink Jet Deflector

IP.com Disclosure Number: IPCOM000083050D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Fan, G: AUTHOR [+2]

Abstract

This is an electromagnetic structure having three pole pieces instead of the usual four to achieve two-dimensional, X-Y deflection of an ink droplet.

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Two Dimensional Magnetic Ink Jet Deflector

This is an electromagnetic structure having three pole pieces instead of the usual four to achieve two-dimensional, X-Y deflection of an ink droplet.

The deflector is comprised of three or more pole pieces 10, 12 and 14, which are made from ferromagnetic material of high saturation magnetization, such as Fe compounds and ferrites. Deflection is controlled by three pairs of windings 16, 18 and 20, with each pair being in series, such that the flux in the gap adds among a given pair. Each winding pair creates a field and field gradient in the gap carrying the droplet towards a given direction.

A droplet passing through the deflector can be deflected in one of the three directions 1, 2 or 3. For example, when winding 22 is activated, the droplet moves in the direction 1.

If the air gap is sufficiently large, such that the pole material is not saturated, the principle of superposition will hold in this structure. In such an instance, by judicious choice of the current flow in a given winding, a droplet may be deflected towards any given point in the X-Y plane.

The deflection principle is understood by considering the force diagram as shown in Fig. 2. By linear combination of forces in 1 and 2 directions, an area for printing in region A is covered. By linear combination of forces in the 2 and 3 directions, the area B is defined for printing, and area C is defined by a linear combination of the forces in the directions 1 and...