US3278940A - Electrostatic emitter for writing with ink jet - Google Patents

Electrostatic emitter for writing with ink jet Download PDF

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Publication number
US3278940A
US3278940A US310691A US31069163A US3278940A US 3278940 A US3278940 A US 3278940A US 310691 A US310691 A US 310691A US 31069163 A US31069163 A US 31069163A US 3278940 A US3278940 A US 3278940A
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Prior art keywords
electrode
jet
ink
ink jet
writing
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Expired - Lifetime
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US310691A
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English (en)
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Ascoli Enzo
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Paillard SA
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Paillard SA
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers

Definitions

  • This invention relates to an improvement in electrostatic emitters for performing writing with a jet of ink.
  • An emitter for this process consists principally of a base of insulating material which supports a metal capillary tube fed with ink, and four deflector plates disposed symmetrically in opposing pairs around the axis of the tube and in front thereof. The difference between the potential of the tube and the mean potential of the plates creates an axial electric field which removes particles of ink, carrying electric charges, at the end of the tube, and accelerates the latter, forming a jet which strikes the writing surface.
  • This jet then passes between the deflector plates and the potential difference between two opposing plates creates a transverse electric field which deflects the path of the jet.
  • a transverse electric field which deflects the path of the jet.
  • a recording apparatus projects a jet of ink from a tube by means of an electric field, continuously, and applies a blocking voltage on a stop electrode disposed between the tube and the writing surface, and having a hole traversed by the ink jet.
  • the stop electrode is designed to send the jet of ink against an accelerator electrode also having a hole for passage of the ink jet and the result is that this electrode is soiled by the ink, so that after a certain time of operation, its form is altered by the deposit of ink, altering the qualities of emission of the ink jet.
  • the purpose of the present invention is to avoid the dispersion of the ink jet in a device in which the ink jet is deflected by means of deflector plates or electrodes to permit tracing characters on a writing surface.
  • the subject of this invention is an electrostatic emitter for writing by an ink jet, comprising an ink nozzle, means for squirting a jet of ink from this nozzle, deflector plates disposed in proximity to the jet to deviate it before it reaches a writing surface.
  • the jet having to pass at least in proximity to an electrode capable of being brought to a potential that can create an electrostatic field whereof an equipotential surface, substantially equal in value to the potential of the nozzle, is situated between the nozzle and the writing surface, in such a way as to control the ink jet and prevent it from reaching the writing surface.
  • the invention is characterized in that the said electrode is disposed in such a way as to create the said equipotential surface, between the deflector plates and the writing 3,278,940 Patented Oct. 11, 1966 surface, obliquely to the axis of the nozzle, to reflect the ink jet in a given direction outside this axis.
  • FIGS. 1 to 3 show, schematically and by way of example, three forms of execution of the subject of the invention.
  • the emitter constitutes a tube or nOZZle 1 for feeding the ink which leaves the latter in the form of a deploying jet 2 passing between deflector plates 3 and 4 and ultimately ending on a sheet 5 disposed on the surface of a roller 6.
  • first electrode 7 and a second electrode 8 are disposed between the deflector plates 3 and 4 and roller 6 there are disposed a first electrode 7 and a second electrode 8, each respectively having a hole 9, 10 for passage of the ink jet which is to reach sheet 5.
  • the hole 10 in electrode 8 is aligned with hole 9 in electrode 7 and the nozzle of tube 1.
  • Below electrode 7 there is a channel 11 which is designed to collect the ink that may accumulate and make droplets 12 at the base of electrode 7 which in this embodiment serves as a target to receive the ink jet during start-up.
  • Means, not shown, permit applying to the electrode 7 a potential substantially equal to the mean potential of the deflector plates 3 and 4. Means also applying as desired, to the electrode 8, a potential substantially equal to that of electrode 7 or a potential substantially equal to that of tube 1 are provided.
  • the potential difference between the latter and electrode 7 is situated between the electrodes 7 and 8 and obliquely intersects the axis of the nozzle.
  • the combination for deviating the jet of ink to prevent it from reaching the paper 5 at the moment the priming of the jet is arranged in such a way that there is no disturbance of the electric field between the tube 1 and the deflector plates 3 and 4.
  • This field is represented schematically by its equipotential surfaces 14. It is pointed out that the visibility in direction or arrow F is scarcely blocked by the presence of electrode 8, which constitutes the stop electrode.
  • the jet 2 is interrupted, it is controlled, when it is started up, by means not shown, by the application of the desired potential to electrode 8 to insure the deviation of the jet and its reflection toward electrode 7.
  • the priming of the jet can therefore take place without difficulty, because the focussing errors which occur at this instant have no effect on the cleanliness of the work.
  • these focussing errors can be compensated, at least in part, as a result of the convergence of the electrostatic mirror.
  • electrode 8 is suddenly brought to the potential of electrode 7 and the jet, well under way, can pass through holes 9 and 10 to trace the desired sign on paper 5.
  • the voltages for deviation of the jet in order to form the sign to be traced can be applied to plates 3 and 4 while the electrostatic mirror is still active.
  • the embodiment shown in FIG. 2 also includes tube 1, deflector plates 3 and 4, electrode 7 with hole 9 and roller 6 bearing the paper which constitutes the writing surface.
  • Electrode 8, according to FIG. 1 has been replaced, however, by two flat electrodes 15 and 16 which are brought to the same potential as that of electrode 7 during writing. At the moment of start-up of the jet, these electrodes are brought to a potential such that, the potential difference between electrode 7 and these electrodes 15 and 16 is greater than and opposite in sign to the potential difference between electrode 7 and tube 1.
  • the potential difference between electrodes 15 and 7 is slightly greater than that between electrodes 16 and 7.
  • the result of the difference in voltages applied to electrodes 15 and 16 is a dissymmetry of the electric field so that the equipotential surfaces of the field are incurved.
  • FIG. 3 shows another embodiment similar to that in FIG. 1 but in which the stop electrode 8 is simply replaced by a horizontal conductive wire 18 which can be brought to a potential creating an electrical field between this wire and electrode 7 which will be opposite in sign and greater than the electric field between tube 1 and electrode 7.
  • the equipotential surfaces are designated as 19, while the surface Whose potential is equal to that of tube 1 is marked 19a. Note that the equipotential surfaces comprised between electrode 7 and the equipotential surface 19a have a convexity toward tube 1, in such a way that there results a slight dispersion of the ink jet when the latter is reflected.
  • the form of electrode 8 in FIG. 1 could be selected to converge the ink jet directly into channel 11. We could even completely eliminate f the target in the event the jet of ink can be deviated in a direction in which it can cause no damage.
  • An electrostatic emitter for writing by ink jet 2 comprising an ink nozzle 1, means for squirting an ink jet 2 from this nozzle 1, deflector plates 3, 4 disposed in proximity to the jet 2 to deviate it before it reaches a writing surface 5, this jet 2 having to pass at least in proximity to electrode means 8, 15, 16, 18 which can be brought to a potential capable of creating an electrostatic field, whereof an equipotential surface 17a, 19a of value substantially equal to the potential of nozzle 1 is provided between the nozzle 1 and the writing surface 5 in such a way as to reflect the ink jet 2 and prevent it from reaching the writing surface 5, characterized in that the said electrode 8, 15, 16, 18 is disposed to create the said equipotential surface 17a, 19a between the deflector plates 3 and 4 and the writing surface 5, obliquely to the axis of the nozzle 1 to reflect the ink jet 2 in a given direction outside this axis.
  • said electrode means comprises a first and second electrode 7, 8 disposed between the deflector plates 3, 4 and the writing surface 5 with said first electrode disposed adjacent said deflector plates 3, 4 and each of said electrodes 7, 8 having an opening 9, 10 respectively for passage of the jet 2 when it is not reflected.
  • said electrode means includes a first electrode 7, having an opening 9 for passage of the jet when it has left the deflector plates 3, 4 and two other electrodes 15, 16 disposed between said first electrode and the writing surface 5 and capable of being brought to different potentials relative to said first electrode to create the said equipotential surface 170.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
US310691A 1962-10-08 1963-09-23 Electrostatic emitter for writing with ink jet Expired - Lifetime US3278940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1180862A CH384881A (fr) 1962-10-08 1962-10-08 Emetteur électrostatique pour l'écriture par jet d'encre

Publications (1)

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US3278940A true US3278940A (en) 1966-10-11

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ID=4377069

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US310691A Expired - Lifetime US3278940A (en) 1962-10-08 1963-09-23 Electrostatic emitter for writing with ink jet

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US (1) US3278940A (de)
AT (1) AT247885B (de)
CH (1) CH384881A (de)
DE (1) DE1204842B (de)
NL (1) NL142780B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373436A (en) * 1964-05-06 1968-03-12 Philips Corp Ink jet recorder
US3458761A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3458760A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3458762A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3484794A (en) * 1967-11-09 1969-12-16 Teletype Corp Fluid transfer device
US3500436A (en) * 1968-01-08 1970-03-10 Teletype Corp Fluid transfer device
US3579245A (en) * 1967-12-07 1971-05-18 Teletype Corp Method of transferring liquid
US3604980A (en) * 1970-05-25 1971-09-14 Mead Corp Drop-charging apparatus
FR2423338A1 (fr) * 1977-12-09 1979-11-16 Ibm Procede et dispositif pour compenser l'instabilite d'une suite de gouttelettes d'encre
WO1981003149A1 (en) * 1980-05-01 1981-11-12 Commw Scient Ind Res Org Control of droplets in jet printing
US4923743A (en) * 1987-06-15 1990-05-08 Milliken Research Corporation Apparatus and method for spraying moving substrates
US4939258A (en) * 1985-10-01 1990-07-03 Eli Lilly And Company Cycloalkanol esters of dihydrolysergic acid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1941001A (en) * 1929-01-19 1933-12-26 Rca Corp Recorder
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US2676868A (en) * 1952-06-10 1954-04-27 Carlyle W Jacob Electronic signal controlled recording system and apparatus
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766249A (en) * 1929-06-14 1930-06-24 Rca Corp Deflector
US1766241A (en) * 1929-06-15 1930-06-24 Rca Corp Deflector
FR1223700A (fr) * 1958-05-16 1960-06-20 Teletype Corp Procédé et appareil de production d'un enregistrement imprimé au moyen d'un jet d'encre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1941001A (en) * 1929-01-19 1933-12-26 Rca Corp Recorder
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US2676868A (en) * 1952-06-10 1954-04-27 Carlyle W Jacob Electronic signal controlled recording system and apparatus
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373436A (en) * 1964-05-06 1968-03-12 Philips Corp Ink jet recorder
US3458761A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3458760A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3458762A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3484794A (en) * 1967-11-09 1969-12-16 Teletype Corp Fluid transfer device
US3579245A (en) * 1967-12-07 1971-05-18 Teletype Corp Method of transferring liquid
US3500436A (en) * 1968-01-08 1970-03-10 Teletype Corp Fluid transfer device
US3604980A (en) * 1970-05-25 1971-09-14 Mead Corp Drop-charging apparatus
FR2423338A1 (fr) * 1977-12-09 1979-11-16 Ibm Procede et dispositif pour compenser l'instabilite d'une suite de gouttelettes d'encre
US4223318A (en) * 1977-12-09 1980-09-16 International Business Machines Corporation Method and apparatus for compensating for instability of a stream of droplets
WO1981003149A1 (en) * 1980-05-01 1981-11-12 Commw Scient Ind Res Org Control of droplets in jet printing
US4939258A (en) * 1985-10-01 1990-07-03 Eli Lilly And Company Cycloalkanol esters of dihydrolysergic acid
US4923743A (en) * 1987-06-15 1990-05-08 Milliken Research Corporation Apparatus and method for spraying moving substrates

Also Published As

Publication number Publication date
CH384881A (fr) 1965-02-26
NL142780B (nl) 1974-07-15
DE1204842B (de) 1965-11-11
AT247885B (de) 1966-06-27

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