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SEALED SLOT INK JET APPARATUS

IP.com Disclosure Number: IPCOM000025942D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 120K

Publishing Venue

Xerox Disclosure Journal

Abstract

An ink jet writing head comprises an ink filled cavity having a slot sealed with magnetic fluid. The slot is opened locally to permit ejection of an ink drop by subjecting the slot to coincident pressure pulses from suitably positioned piezoelectric transducers. By changing the relative timing of the pressure pulses, different spots along the slot can be opened. The magnetic fluid prevents evaporation of the ink from the slot.

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XEROX DISCLOSURE JOURNAL

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Proposed Classification
U.S. C1.346/140R
Int. C1. Gold 15/16

SEALED SLOT INK JET APPARATUS
Robert C. Forsyth

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FIG. I

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FIG. 3

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SEALED SLOT INK JET APPARATUS (Cont'd)

An ink jet writing head comprises an ink filled cavity having a slot sealed with magnetic fluid. The slot is opened locally to permit ejection of an ink drop by subjecting the slot to coincident pressure pulses from suitably positioned piezoelectric transducers. By changing the relative timing of the pressure pulses, different spots along the slot can be opened. The magnetic fluid prevents evaporation of the ink from the slot.

More specifically, as illustrated in Figures 1 and 2, the ink 1 is retained in place in Figure 1 by the presence of the magnetic fluid or ferro fluid 3. The magnetic fluid seal is retained by linear magnets 5 that produce the jetting orifice. When ejection of a droplet is desired, the seal is disrupted as illustrated in Figure 2 to permit an ink droplet to ass through the jetting orifice.

pressure within the ink reservoir. One method of generating this pressure is by the coincidence of pressure waves induced in the ink by suitably placed piezoelectric transducers. As illustrated in Figure 3, two piezoelectric transducers 1 and 3 generate pressure waves that are coincident at the location of the sealed orifice 5. The pressure waves disru t the magnetic fluid

along the slot at which the two waves are coincident can be controlled by the firing time of the pulses....