Drop Charging and Deflection in an Electrostatic Ink Jet Printer

Fillmore, Gary L.; Buehner, W. L.; West, David L.

doi:10.1147/rd.211.0037

Cited by 56 publications

(22 citation statements)

References 5 publications

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“…For example, the drop-induced charge effect caused by electrostatic cross-talk between the drop being charged and the adjacent charged droplet, can affect the drop flight path. 12 Such an effect causes the leading drop of a printed segment to hold an excess charge as compared to following drops, causing additional deflection of the leading drops [see fig. 10(a)].…”

Section: Printed Drops Dynamicsmentioning

confidence: 99%

Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell

Curodeau

Sachs

Caldarise

2000

J. Biomed. Mater. Res.

149

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Three-dimensional printing is a solid freeform fabrication process, which creates parts directly from a computer model. The parts are built by repetitively spreading a layer of powder and selectively joining the powder in the layer by ink-jet printing of a binder material. 3D printing was applied to the fabrication of sub-millimeter surface textures with overhang and undercut geometries for use in orthopedic prostheses as bony ingrowth structures. 3D printing is used to fabricate ceramic molds of alumina powder and silica binder, and these molds are used to cast the bony ingrowth surfaces of Co-Cr (ASTM F75) alloy. Minimum positive feature sizes of the ceramic mold and, therefore, minimum negative feature sizes of castings were determined to be approximately 200 x 200 x 175 microm and were limited by the strength of ceramic needed to withstand handling. Minimum negative feature sizes in the ceramic mold and, therefore, minimum positive features in the casting were found to be approximately 350 x 350 x 175 microm and were determined by limitations on removal of powder from the ceramic and the pressure required to fill these small features with molten metal during casting. Textures were designed with 5 layers of distinct geometric definition, allowing for the design of overhung geometry with overall porosity ranging from 30-70%. Features as small as 350 x 350 x 200 microm were included in these designs and successfully cast.

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Section: Printed Drops Dynamicsmentioning

confidence: 99%

Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell

Curodeau

Sachs

Caldarise

2000

J. Biomed. Mater. Res.

149

View full text Add to dashboard Cite

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“…A great deal of background work on droplet charging has been performed in the 1960's and 70's for the well-known application of ink-jet printing. A few of the more important experimental works are given by Sweet [18,19], Schneider et al [20], Kamphoefner [21], and Fillmore et al [22]. Analogous to the applications described in this work, an ink-jet jet printer produces characters on paper by deflecting charged droplets on one axis while the print head moves along the perpendicular axis.…”

Section: Droplet Chargingmentioning

confidence: 89%

Mutual Electrostatic Interactions Between Closely Spaced Charged Solder Droplets

2000

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Emerging technologies of net-form manufacturing and electronic packaging rely on the use of precisely deposited molten metal droplets with sizes on the order of 100 µm in diameter. In many technological realizations, c losely spaced droplets are electrostatically charged and deflected onto a substrate in a manner similar to ink-jet printing in order to "print" fine features onto a board for electronics applications or onto a substrate for net-form manufacturing. Unlike ink-jet printing, the aforementioned emerging technologies require the printing of large lateral dimensions onto the substrate by means of electrostatic charging and deflection (on the order of several centimeters), and hence these applications require the droplets to have significantly higher charges than in the ink-jet printing technology. The high charges of the closely spaced droplets can lead to inter-droplet electrostatic interactions that will cause significant deviations in the droplets' trajectories. Hence, the understanding of the physics of inter-droplet electrostatic interactions is of primary importance in order to assure the fidelity of the net-formed component or the printed electronic package. In this work, we present a model that predicts the trajectories of the droplets when charged and deflected and corresponding experimental validations. Conditions for which electrostatic interactions are negligible are sought.

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“…A method was developed in which uncharged drops are inserted between deflected drops [13] to prevent drop merging due to aerodynamic interaction effects. This does lower the drop utilization efficiency which, together with drop frequency, resolution, and character height requirements, determined the burst printing rate (92 twelve-pitch characters per second).…”

Section: Drop Deflection Parametersmentioning

confidence: 99%

Application of Ink Jet Technology to a Word Processing Output Printer

et al. 1977

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This paper describes a word processing system output printer that uses the electrostatic synchronous ink jet printing process. An overview of the ink jet matrix printing process is included, as well as brief descriptions of the elements of the printer. Printer performance objectives are outlined, and some of the design problems encountered during development are discussed. 2 IntroductionThe descriptive term "word processing" is becoming as meaningful in the modern office environment as "data processing" is already in the environment of the electronic computer. A key element of the word processing system is the output printer, which, typically, has been an impact printer. However, new requirements are being set for system performance and for operating speeds that exceed the capabilities of most impact printing technologies. Ink jet printing offers the capability for increased performance to meet those needs. This paper discusses the use of ink jet printing as the basis for the word processing output printer that is a component of the IBM 46/40 Document Printer.In ink jet printing, characters are formed from small ink drops, which can be produced at rates of about 10 5 drops per second. On the average, 10 3 drops per character are needed for "high quality" printing. Hence, rates of almost 100 characters per second can be achieved without dependence on the high speed operation of mechanical printing elements.As a printer requirement, character image quality is also important. Using several measures of quality, ink jet printing has proven to be at least as good as that produced by impact printers, such as electric typewriters.We felt also that such an output printer should be capable of producing a variety of character styles, including those needed for all languages based on the Roman alphabet and special symbols in to-pitch, 12-pitch, and pro-

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Drop Charging and Deflection in an Electrostatic Ink Jet Printer

Cited by 56 publications

References 5 publications

Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell

Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell

Mutual Electrostatic Interactions Between Closely Spaced Charged Solder Droplets

Application of Ink Jet Technology to a Word Processing Output Printer

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