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A SEGMENTED DROP GENERATOR

IP.com Disclosure Number: IPCOM000025254D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 137K

Publishing Venue

Xerox Disclosure Journal

Abstract

Continuous ink jet devices exhibit vibration and other effects caused by the need to perturbate the fluid medium and expel1 droplets of ink from an orifice. The fact that this may be done over a wide array, creates additional problems of standing waves and accompanying power nodes, if the operating frequency changes relative to the fixed mechanical dimensions of the array. The segmented drop generator 10 shown in the accompanying figure offers a means to eliminate or minimize a number of the effects inherent in the long arrays necessary to produce high resolution, page width images. The drop generator 10 has a plurality of separate structures 12 which house a plurality of ink channels 14, the number of channels being determined by system constraints. The separation between structures is minimal, with the constraint being the interval spacing between the streams in the array. The structure 12 spacing is the means to break up any lengthwise modes caused by the operating frequency.

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XEROX DISCLOSURE JOURNAL

A SEGMENTED DROP GENERATOR Roger R. D. Snyder

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Proposed Classification
U.S. CI. 346/75
Int. CI. Gold 15/18

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Volume 9 Number 2 March/April 1984 125

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A SEGMENTED DROP GENERATOR (Cont'd)

Continuous ink jet devices exhibit vibration and other effects caused by the need to perturbate the fluid medium and expel1 droplets of ink from an orifice. The fact that this may be done over a wide array, creates additional problems of standing waves and accompanying power nodes, if the operating frequency changes relative to the fixed mechanical dimensions of the array. The segmented drop generator 10 shown in the accompanying figure offers a means to eliminate or minimize a number of the effects inherent in the long arrays necessary to produce high resolution, page width images. The drop generator 10 has a plurality of separate structures 12 which house a plurality of ink channels 14, the number of channels being determined by system constraints. The separation between structures is minimal, with the constraint being the interval spacing between the streams in the array. The structure 12 spacing is the means to break up any lengthwise modes caused by the operating frequency.

Each structure 12 is mounted on a common base 16 and could be integral therewith. Each structure has an independent, sandwich-type PZT driving element 18, an independent ink replenishment reservoir 20 which is external to and isolated from the common base, and a nozzle plate 22 having multiple nozzles 24 therein. Each nozzle is connected to the ink replenishment reservoir by an individual channel 14. The PZT driving element is positioned near the nozzle plate and is separated from the channels by a relatively thin web of material which may or may not be the same material as that of the structure 12.

Streams of ink are emitted from the nozzles when the replenishment reservoir is pressurized. The streams 26 are broken up into droplets 28 at a specific distance from the nozzle plate by applying an AC voltage of appropriate frequency to the PZT driving elements from a variable drive source 30.

The individual ink reservoir in each structure prevents standing waves in the ink system by three techniques; first, the separate reservoir prevents standing wave interaction between groups of structures; second, the length of the individual reservoir can be tuned to operate at a particular operating frequency by increasing or decreasing its length to match the chosen operating fre...