WO1994008792A1 - Procede et systeme de marquage par gouttes et deflecteur de gouttes associe - Google Patents

Procede et systeme de marquage par gouttes et deflecteur de gouttes associe Download PDF

Info

Publication number
WO1994008792A1
WO1994008792A1 PCT/GB1993/002101 GB9302101W WO9408792A1 WO 1994008792 A1 WO1994008792 A1 WO 1994008792A1 GB 9302101 W GB9302101 W GB 9302101W WO 9408792 A1 WO9408792 A1 WO 9408792A1
Authority
WO
WIPO (PCT)
Prior art keywords
high voltage
voltage electrode
drops
electrode
drop
Prior art date
Application number
PCT/GB1993/002101
Other languages
English (en)
Inventor
George Arway
Frank Eremity
Original Assignee
Videojet Systems International, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Videojet Systems International, Inc. filed Critical Videojet Systems International, Inc.
Priority to AU51531/93A priority Critical patent/AU5153193A/en
Priority to JP6509753A priority patent/JPH08501997A/ja
Priority to GB9505256A priority patent/GB2285604A/en
Publication of WO1994008792A1 publication Critical patent/WO1994008792A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/09—Deflection means

Definitions

  • the structure defining the orifice is subjected to ultrasonic vibrations
  • the drop rate is proportional to the rate of vibration.
  • the stream of ink drops is directed past a charge electrode or ring where selected drops are charged.
  • a charge electrode or ring where selected drops are charged.
  • the drops are next directed past a drop deflection means comprising a pair of electrodes which have a potential difference of several thousand volts to establish an
  • the result is the ability to direct drops of ink to selected positions along a line on a printing medium by controlling the electrical charge which a drop receives. This ability is used, in conjunction with movement of the nozzle, to generate predetermined markings, such as alphanumeric characters.
  • the deflection electrodes through which the charged ink drop passes and the time taken for the ink drop to travel therethrough. It is also well known that the size of the printed character is directly related to the maximum obtainable angular change in the
  • any increase of the field intensity will enable a reduction in the length of the deflection electrodes which, in turn, translates into an advantageous decrease in both the overall size of the print head and the spacing
  • This ink mist has an electrical charge which in a collected form can
  • means including a high voltage electrode and a low voltage electrode, means for maintaining the low voltage electrode at ground or nearly at ground, means for
  • uncharged drops to include a high voltage electrode and a low voltage electrode
  • a drop marking system or a drop deflector for a drop marking system, has the insulation material covering substantially the entire surface of the high voltage electrode whereby the electric field strength can be increased by operating the high voltage electrode at a voltage which would otherwise cause inter-electrode arcing.
  • deflection means than at its exit.
  • the means for applying the high voltage to the high voltage electrode may be any suitable means for applying the high voltage to the high voltage electrode.
  • the low voltage electrode has an uninsulated portion positioned to
  • a method of deflecting selected charged drops from a first trajectory to another trajectory includes insulating the high voltage electrode to enable operation at a voltage which would otherwise cause inter-electrode arcing.
  • the method may include applying the high voltage to the high voltage electrode with the same polarity as the charge on the charged drops whereby the charged drops will be repelled by the high voltage electrode towards the low voltage electrode.
  • the high voltage electrode to prevent arcing or of using the grounded electrode for ink
  • the present invention employs this arrangement by using the high
  • the grounded electrode attracts ink mist to neutralize it thereby avoiding any substantial effect on field strength. This permits the high voltage electrode to be completely insulated to prevent
  • the deflection electrodes can be spaced closer than uninsulated or partially insulated electrodes which depend only on avoiding a dielectric breakdown of the air
  • the present invention therefore provides a print head having deflection electrodes of decreased length.
  • Figure 1 is a schematic block diagram of a known drop marking system utilized
  • Figure 2 is an enlarged diagrammatic view of the ink jet printer head shown in Figure 1 illustrating details of the drop deflector
  • FIGs 3, 4, 5 and 6 are diagrams similar to Figure 2 but illustrating alternative forms of drop deflector, in accordance with the present invention, for use with a drop
  • a drop marking system has a tank 10 for a supply of
  • resistivity of the ink is preferably in the range of 100 ohm-cm to 1500 ohm-cm.
  • the nozzle 14 has a small orifice 20 through which the ink is emitted.
  • the orifice 20 is preferably defined in a jewel 22 located in the end of the nozzle 14.
  • a piezoelectric transducer 24 is fitted in abutting contact with the nozzle 14 and is driven, generally at an ultrasonic rate, by conventional oscillator/character generator circuitry 26.
  • the ink stream, emitted from the orifice 20 by virtue of the pressure from pump 12, is broken up by the transducer 24 into a series of ink drops 28.
  • transducer 24 constitute a means for emitting a stream of ink drops along a trajectory
  • a charge electrode or ring 30 is provided along the trajectory T, near the orifice 20 and functions to charge selected individual ink drops 28, as they break off from the stream in the proximity of the ring 30, thus trapping a selected charge on each selected ink drop.
  • a positive potential is placed on ring 30 to cause a negative charge on the selected ink drops 28 which are identified in Figures 1 and 2 by individual
  • the oscillator/character generator 26 generates a time variant video
  • All of the ink drops 28 thereafter pass along the trajectory T 1 into a spaced deflection system which is indicated generally by arrow 32 and comprises divergent linear deflection electrodes 52 and 54.
  • the electrode 52 is grounded as shown at 53, but the electrode 54 is connected to a means 55 for applying high voltage sufficient to create an electric field between the electrodes 52 and 54 to deflect the selected charged drops 28.
  • All of the uncharged drops 28 are unaffected by this electric field and continue along their initial trajectory T, until intercepted by the gutter 36 and returned through conduit 38 to the ink reservoir. However, the selected negatively charged drops 28 are deflected by the electric field towards the positively charged high
  • a medium 34 such as paper or other printable material
  • E x is the electric field intensity between planar shaped deflection electrodes
  • V j0 is the initial drop velocity
  • m d is the mass of the ink drop
  • z 0 is the axial distance from the point of drop formation to the print surface.
  • each drop is in direct proportion to the magnitude of the charge "q" placed thereon. If no charge is placed on the drop, it passes deflection system 32 along a straight, undeflected path into gutter 36 and is not printed on the medium 34.
  • the ink drop deflection "x" is directly related to the intensity of the electric field "E x " which acts upon each charged ink drop as it passes through the deflection system 32 towards the print medium 34. Accordingly any increase in the field intensity "E x " will result in a linear increase in the ink drop deflection "x". Thus, consistent with maintaining a predetermined character size (i.e. maximum drop deflection), it will be appreciated that the axial distance "z 0 u travelled by the ink drops may be reduced if the electric field intensity "E x " is correspondingly increased. As previously indicated, the field intensity "E x " cannot be increased without limit
  • Figure 2 illustrates, in greater detail, the improved deflection system taught by Videojet Systems International, Inc. in which a higher field intensity than conventional is achieved.
  • the linear deflection electrodes 52 and 54 diverge, in the direction of the ink drop'travel, from a drop entrance 58 of relatively close spacing adjacent the ring 30 to a drop exit 60 of maximum spacing adjacent the medium 34 and the gutter 36.
  • the means 55 places a fixed positive high DC potential, typically about 5000
  • the desired high field intensity in the region of the entrance 58 is achieved by
  • the drop entrance 58 of the Figure 2 structure may be reduced to 3/32 inch (0.24 cm) or even 1/16 inch
  • the electrodes 52 and 54 diverge to a spacing of between about 3/16 and 5/16 inch (that is 0.48 cm to 0.80 cm) at the drop exit 60.
  • dielectric insulation material 62 can be Teflon FEP which exhibits a dielectric strength (236 KV/cm) six times that of air, and therefore, a relatively thin 1/10 inch (0.25 cm) layer of this material provides an additional 5,900 volts dielectric strength thereby doubling the maximum useable electric field intensity.
  • deflection electrode 54 to have its exit end 66 left uninsulated and exposed to provide
  • the deflection structure consists of a pair of plates defining deflection
  • the upper electrode 90 is grounded, or nearly so, to provide the low voltage electrode while the lower electrode 92 is maintained at a negative voltage on the order of 2,000 to 5,000 volts to provide the high voltage electrode.
  • voltage electrode 92 is surrounded by an insulating layer 94 which can be of any suitable insulating material such as that previously discussed in connection with the prior art insulating layer 62 in Figure 2. It should particularly be noted that, because the electrode 92 is completely encapsulated, arcing between the electrode cannot
  • the ink drops selected for marking the substrate 34 are negatively charged and are therefore repelled by the high voltage electrode 92, as indicated in the drawing, to cause a deflection onto a trajectory, such as T 2 , to mark the substrate 34.
  • the high voltage electrode is completely encapsulated in insulating material, it cannot be used for mist control. However, this function is provided by the low voltage electrode 90 due to the use of negatively charged drops, that is the same polarity as the high voltage electrode 92. Thus mist, which forms when the drops impact on the substrate 34, is attracted to an end 96 of the grounded electrode 90. Because the high voltage electrode plate 92 is encapsulated in a material of high dielectric strength having very high resistivity (of the order of a thousand volts/mil and
  • the high voltage encapsulated electrode 92 is preferably of the same polarity as the charge on the ink
  • the other electrode 90 is preferably substantially at ground potential.
  • the plates are shown as planar but may have other geometries.
  • the present invention permits increased field intensity without adverse inter-electrode arcing, thereby permitting a shorter printhead. This can be accomplished without sacrificing the ink mist neutralizing function.
  • the high voltage electrode is completely encapsulated in an insulating material.
  • the uninsulated electrode is preferably grounded or at a very nominal voltage (say not more than 100 volts) and utilized for the mist neutralization function. Because the ink drops and high voltage electrode are of the same polarity, the high voltage electrode repels the drops to cause deflection, rather than attracting the drops as in the prior art.
  • the gutter 36 could be repositioned to
  • the end 96 of the low voltage electrode 90 may be kept at a low positive voltage to collect satellites 98 from the vicinity of the catcher 36. Other satellites may
  • drops for recirculation are the most heavily charged drops which pass along trajectory
  • the relative disposition of the electrodes 90, 92 may be as shown but, if
  • the deflected drops can escape through the drop exit 60.
  • the angular diverge of the electrodes may also be increased.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

Des électrodes de déflexion (90, 92) créent une région d'intensité de champ électrique élevée et une région (96) de suppression de buée d'encre. L'intensité de champ élevée est obtenue par un écartement plus étroit des électrodes de déflexion (90, 92) qu'il n'a été possible d'obtenir jusqu'ici. L'intensité de champ de deflexion plus élevée facilite la déflexion maximale de la goutte d'encre et l'obtention de dimensions de caractères maximales, bien que la longueur utile des électrodes (90, 92) peut être sensiblement inférieure à celle des têtes d'impression classiques à jet d'encre. Un matériau isolant (94) est placé sur l'électrode de déflexion à haute tension afin d'éviter la formation d'un arc à haute tension. L'électrode isolée et les gouttes d'encre à défléchir peuvent présenter la même polarité, ce qui permet d'obtenir une région (96) de suppression de buée à placer sur l'électrode (90) à basse tension.
PCT/GB1993/002101 1992-10-13 1993-10-11 Procede et systeme de marquage par gouttes et deflecteur de gouttes associe WO1994008792A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU51531/93A AU5153193A (en) 1992-10-13 1993-10-11 Method and system for drop marking and a drop deflector for use therewith
JP6509753A JPH08501997A (ja) 1992-10-13 1993-10-11 小滴による表示方法及びシステム並びにこれと共に使用する小滴偏向器
GB9505256A GB2285604A (en) 1992-10-13 1993-10-11 Method and system for drop marking and a drop deflector for use therewith

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96013892A 1992-10-13 1992-10-13
US07/960,138 1992-10-13

Publications (1)

Publication Number Publication Date
WO1994008792A1 true WO1994008792A1 (fr) 1994-04-28

Family

ID=25502835

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/002101 WO1994008792A1 (fr) 1992-10-13 1993-10-11 Procede et systeme de marquage par gouttes et deflecteur de gouttes associe

Country Status (7)

Country Link
JP (1) JPH08501997A (fr)
CN (1) CN1090815A (fr)
AU (1) AU5153193A (fr)
CA (1) CA2145385A1 (fr)
GB (1) GB2285604A (fr)
TW (1) TW240197B (fr)
WO (1) WO1994008792A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2763870A1 (fr) * 1997-06-03 1998-12-04 Imaje Sa Systeme de commande de projection de liquide electriquement conducteur
WO1999059822A1 (fr) * 1998-05-20 1999-11-25 Linx Printing Technologies Plc Imprimante a jet d'encre et panneau deflecteur a cet effet
EP2666634A2 (fr) * 2012-05-22 2013-11-27 Hitachi Industrial Equipment Systems Co., Ltd. Appareil d'enregistrement à jet d'encre
US20130314475A1 (en) * 2012-05-25 2013-11-28 Franklin S. Love, III Resistor Protected Deflection Plates For Liquid Jet Printer
EP2979871A4 (fr) * 2013-03-28 2017-02-15 Hitachi Industrial Equipment Systems Co., Ltd. Dispositif d'impression par jet d'encre
US11752784B2 (en) 2019-05-14 2023-09-12 Electronics For Imaging, Inc. Printing systems and associated structures and methods having ink drop deflection compensation

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3794406B2 (ja) * 2003-01-21 2006-07-05 セイコーエプソン株式会社 液滴吐出装置、印刷装置、印刷方法および電気光学装置
CN101035679B (zh) * 2004-06-17 2010-06-16 录象射流技术公司 用于对准喷墨打印机充电通道的系统
GB0701233D0 (en) * 2007-01-23 2007-02-28 Videojet Technologies Inc A continuous stream ink jet print head
KR101339987B1 (ko) * 2007-12-24 2013-12-10 삼성전자주식회사 액적 질량편차 측정장치와 이의 액적 질량편차 측정방법과이를 이용하는 패턴형성 시스템 및 이를 이용하는 패턴형성시스템의 제어방법
JP5725800B2 (ja) * 2010-06-24 2015-05-27 キヤノン株式会社 液体吐出ヘッド
CN104417063B (zh) * 2013-08-21 2016-03-23 北大方正集团有限公司 一种降低套齐误差影响的方法及装置
JP7013461B2 (ja) * 2017-06-20 2022-01-31 株式会社日立産機システム インクジェット記録装置
CN108790405B (zh) * 2018-04-19 2019-07-09 华中科技大学 一种能够消除墨滴电荷的电流体动力打印喷头
CN110525048B (zh) * 2019-08-30 2020-10-09 合肥京东方卓印科技有限公司 一种测量墨滴体积的装置、系统及方法

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US4031561A (en) * 1976-05-03 1977-06-21 The Mead Corporation Startup apparatus and method for jet drop recording with relatively movable charge plate and orifice plate
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JPS5567468A (en) * 1978-11-15 1980-05-21 Fuji Xerox Co Ltd Ink jet recorder
JPS55166258A (en) * 1979-06-11 1980-12-25 Ricoh Co Ltd Ink jet recording device
US4249189A (en) * 1979-09-04 1981-02-03 The Mead Corporation Ink jet printer having improved deflection electrode
JPS5655265A (en) * 1979-10-11 1981-05-15 Ricoh Co Ltd Multiple deflecting electrode structure for liquid jet recorder
JPS56123872A (en) * 1980-03-05 1981-09-29 Ricoh Co Ltd Ink jet recording device
JPS599061A (ja) * 1982-07-09 1984-01-18 Hitachi Ltd 荷電変調式インクジエツトプリンタ
US4743922A (en) * 1984-11-13 1988-05-10 Imaje S.A. Ink jet single-nozzle printing head

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055315A1 (fr) * 1997-06-03 1998-12-10 Imaje Systeme de commande de projection de liquide electriquement conducteur
CN1095752C (zh) * 1997-06-03 2002-12-11 伊马治公司 导电液体的喷射控制系统及具有该控制系统的喷墨打印机
US6511164B1 (en) 1997-06-03 2003-01-28 Imaje S. A. Control system for spraying electrically conductive liquid
FR2763870A1 (fr) * 1997-06-03 1998-12-04 Imaje Sa Systeme de commande de projection de liquide electriquement conducteur
WO1999059822A1 (fr) * 1998-05-20 1999-11-25 Linx Printing Technologies Plc Imprimante a jet d'encre et panneau deflecteur a cet effet
US6357860B1 (en) 1998-05-20 2002-03-19 Linx Printing Technologies Plc Ink jet printer and deflector plate therefor
US6467880B2 (en) 1998-05-20 2002-10-22 Linx Printing Technologies Plc Ink jet printer and deflector plate therefor
EP2666634A3 (fr) * 2012-05-22 2014-03-12 Hitachi Industrial Equipment Systems Co., Ltd. Appareil d'enregistrement à jet d'encre
EP2666634A2 (fr) * 2012-05-22 2013-11-27 Hitachi Industrial Equipment Systems Co., Ltd. Appareil d'enregistrement à jet d'encre
US20130314475A1 (en) * 2012-05-25 2013-11-28 Franklin S. Love, III Resistor Protected Deflection Plates For Liquid Jet Printer
US20160136946A1 (en) * 2012-05-25 2016-05-19 Milliken & Company Resistor Protected Deflection Plates for Liquid Jet Printer
US9452602B2 (en) * 2012-05-25 2016-09-27 Milliken & Company Resistor protected deflection plates for liquid jet printer
US9550355B2 (en) * 2012-05-25 2017-01-24 Milliken & Company Resistor protected deflection plates for liquid jet printer
EP2979871A4 (fr) * 2013-03-28 2017-02-15 Hitachi Industrial Equipment Systems Co., Ltd. Dispositif d'impression par jet d'encre
US9636912B2 (en) 2013-03-28 2017-05-02 Hitachi Industrial Equipment Systems Co., Ltd. Ink jet recording device
US11752784B2 (en) 2019-05-14 2023-09-12 Electronics For Imaging, Inc. Printing systems and associated structures and methods having ink drop deflection compensation

Also Published As

Publication number Publication date
GB2285604A (en) 1995-07-19
TW240197B (fr) 1995-02-11
CN1090815A (zh) 1994-08-17
JPH08501997A (ja) 1996-03-05
CA2145385A1 (fr) 1994-04-28
AU5153193A (en) 1994-05-09
GB9505256D0 (en) 1995-05-10

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