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Magnetic Transducer With Shunts for Magnetic Ink Jet Recorder

IP.com Disclosure Number: IPCOM000083361D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Pimbley, WT: AUTHOR

Abstract

In a magnetic ink jet recorder, a continuous jet stream of magnetic ink drops 10 is projected from a drop generator 11 past a magnetic transducer 12, to either a drop catcher 13 or a relatively movable print medium 14. The selection of drops 10 is obtained by applying data signal pulses to the winding 15 of transducer 12, in timed relation with the flight of the drops 10 adjacent a gap 16 formed by magnetic field elements 17 and 18 of transducer 12.

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Magnetic Transducer With Shunts for Magnetic Ink Jet Recorder

In a magnetic ink jet recorder, a continuous jet stream of magnetic ink drops 10 is projected from a drop generator 11 past a magnetic transducer 12, to either a drop catcher 13 or a relatively movable print medium 14. The selection of drops 10 is obtained by applying data signal pulses to the winding 15 of transducer 12, in timed relation with the flight of the drops 10 adjacent a gap 16 formed by magnetic field elements 17 and 18 of transducer 12.

When the winding 15 is energized by a selection pulse, a magnetic field is produced in the vicinity of gap 16 causing the desired ink drop to be deflected from its initial flight path Into a second flight path to drop catcher 13. The undeflected drops 10 continue along the original flight path, to become deposited in a predetermined data pattern on print medium 14.

In order to obtain quality printing the magnetic transducer 12 must be able to deflect individual drops. Therefore, the thickness of the field elements 16 and 17 is only about half the drop wavelength Lambda. However, a fringe magnetic field is produced by a selection pulse which causes a slight deflection of the adjacent drops, particularly when the drop wavelength is small.

To minimize the effect of fringe magnetic fields on adjacent drops, two small shunts 19 and 20 of ferromagnetic material are attached to opposite sides of field elements 17 and 18 adjacent gap 16. As best seen in Fig. 2, the...