EP0521764B1 - Procédé de projection de liquide et dispositif d'impression haute-résolution dans une imprimante à jet d'encre continu mettant en oeuvre ce procédé - Google Patents

Procédé de projection de liquide et dispositif d'impression haute-résolution dans une imprimante à jet d'encre continu mettant en oeuvre ce procédé Download PDF

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Publication number
EP0521764B1
EP0521764B1 EP92401840A EP92401840A EP0521764B1 EP 0521764 B1 EP0521764 B1 EP 0521764B1 EP 92401840 A EP92401840 A EP 92401840A EP 92401840 A EP92401840 A EP 92401840A EP 0521764 B1 EP0521764 B1 EP 0521764B1
Authority
EP
European Patent Office
Prior art keywords
drops
jet
ink
charging
voltage
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP92401840A
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German (de)
English (en)
French (fr)
Other versions
EP0521764A1 (fr
Inventor
Stéphane Cabinet Ballot-Schmit Vago
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Markem Imaje SAS
Original Assignee
Imaje SA
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 Imaje SA filed Critical Imaje SA
Publication of EP0521764A1 publication Critical patent/EP0521764A1/fr
Application granted granted Critical
Publication of EP0521764B1 publication Critical patent/EP0521764B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • 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
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration
    • 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
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • B41J2002/033—Continuous stream with droplets of different sizes

Definitions

  • the present invention relates to a high-precision liquid spraying method and its implementation by a high-resolution printing device in a stimulated continuous inkjet printer.
  • Such a liquid spraying process therefore applies in the field of high-resolution printing, but can also be applied in the field of microdosing of substances used, for example, during the tracing of printed microcircuits or during the application of microdroplets of conductive adhesive to mount electronic components on a support or to assemble grains of material according to a given geometry.
  • Another interesting application relates to the microdosing of chemical or biological reagents in the manufacture of drugs.
  • the ink jet Before deflection, the ink jet then consists of an alternating series of main drops and satellite drops, the diameter ratio being approximately three.
  • the satellite drops are then deflected using a "binary" type deflection technique: each nozzle of the system corresponds to only one point of the pattern to be printed. As a result, many relative movements between the print head and the support are necessary to cover a given surface, which is a drawback.
  • this printing method has another drawback due to its high sensitivity to the ink jet stimulation process. It is difficult to control the reproducibility of the characteristics of the stimulation device without individually adjusting the mechanical response of each device.
  • a continuous ink jet is divided into drops G N substantially equidistant and equidimentional.
  • V n an appropriate electric voltage
  • the jet detach the upstream filament from this main drop G n and therefore to create a satellite drop S n .
  • a voltage V n + 1 of amplitude substantially equal to V n so that the satellite drop S n remains long enough in the jet between the drops G n and G n + 1 to cross the electric deflection field located downstream and thus be deflected towards the printing medium.
  • the main drops with little deviation are recycled in the ink circuit.
  • the implementation of this method has several drawbacks.
  • the frequency of use of satellite drops is only worth a third of this employee for stimulating the jet: indeed, the drop G n + 1 , whose electrical charge is substantially equal to that of the drop G n , also generates a satellite drop not used for printing, since the value of its charge does not generally correspond to a point in the pattern to be printed.
  • the proposed electrostatic confinement places the satellite drop in an unstable equilibrium situation, affecting the precision of the deflection. This problem is further aggravated by the length of the path taken by these satellite drops which pass between the charge electrodes and then in the electric deflection field.
  • the object of the present invention is to overcome these drawbacks by proposing a method of spraying liquid by continuous jet, generating microdrops other than by acting on the amplitude or the frequency of the excitation leading to the breaking of the jet and n using no additional deflection means other than that created by the interaction between the drops in the jet.
  • the object of the invention is a high resolution liquid spraying method comprising a first step of fractionating the jet of liquid into drops, in the vicinity of an electrostatic device for charging the drops, creating an asymmetrical electric field by relative to the axis of the jet, a second step of creating a single microdrop at the upstream end of a main drop by applying a voltage V M determined in the charging device and finally a step of deflecting the microdrop intended for use by application of another voltage of load V c , lower than the voltage V M , on the main drop immediately following the microdrop.
  • liquid spraying method according to the invention will be described through its application to a high resolution printer.
  • FIG. 1 is a schematic view of an exemplary embodiment of a printing device in a high-resolution continuous inkjet printer, implementing the method according to the invention.
  • a pressurized ink tank (3) provided with an ejection nozzle (2) from which an ink jet (1) escapes.
  • a resonator circuit (4) electrically connected to a modulation circuit (5) stimulates the ink jet (1) and fixes its breaking point (6).
  • an electrical charging device (7) is placed connected to its supply circuit (8), this device having the particularity of inducing an asymmetrical electric field with respect to the axis (D) jet.
  • a detection circuit (9) is placed in the vicinity of the path of the ink drops and is connected to a circuit (10) for processing the captured information.
  • the main ink drops (11), not used for printing, are collected in a gutter (12) and returned by a pipe to the circuit (13) for general ink supply.
  • the projection process according to the invention uses a property which a drop of conductive liquid possesses, demonstrated by Lord Rayleigh in 1882 (see Adrian G. Bailey in Electrostatic Spraying of Liquids - Research Studies Press Ltd 1988): there is an upper limit to the amount of charge a drop of conductive liquid can receive. This limit is called Rayleigh limit in the case where the drop is not subjected to any external influence. Beyond this load limit value, the drop, called mother drop, becomes unstable and ejects one or more highly charged microdrops, which has the effect of bringing its load below the critical Rayleigh value.
  • the method according to the invention controls and uses this phenomenon of electrostatic instability of a drop of conductive liquid in the case of a continuous jet and stimulated in order to obtain a perfectly repetitive ejection of a microdrop unique at the upstream end of a mother drop.
  • FIG. 2a The diagram illustrating this process of creation of the micro-drops according to the invention is given in FIG. 2a.
  • the charging electrode device (7) produces an electric field that is not symmetrical with respect to the axis (D) of the jet and assigns to the mother drops (20, 22 and 24) an electrical charge V M of determined value in order to each expel a microdrop, namely the microdrops (26 and 27) respectively associated with the mother drops (22 and 24), the microdrop resulting from the drop (20) being more visible.
  • the main drops (21, 23, and 25) receive no electrical charge, so the electrostatic repulsion forces existing between the mother drops (22 and 24) and the associated microdrops (26 and 27) respectively , cause these to be very quickly picked up by the main uncharged drops (23 and 25) respectively.
  • the deflection of the microdrops used for printing is obtained by electrically charging, in an appropriate manner, the main drop which immediately follows each mother drop having created a microdrop: such a main drop is called a drop of deflection.
  • a drop of deflection is obtained by electrically charging, in an appropriate manner, the main drop which immediately follows each mother drop having created a microdrop: such a main drop.
  • Vc min of the voltage applied to the drop of deflection the electrostatic repulsion created between this drop and the microdrop preceding it, in the ink jet, is sufficient to eject the latter from the axis (D) of the jet, in the direction defined by l asymmetry of the electric field created by the charging electrode (7).
  • a continuous variation in the angle of deflection thus obtained can be controlled by varying the amount of load applied to the drop of deflection.
  • Vc min of charge of the deflection drops there is a minimum voltage Vc min of charge of the deflection drops to obtain the deflection of the printing microdrops, there is also a maximum voltage Vc max beyond which the strong electrostatic interaction between the deflection drops and the drops -mothers then prevents the expulsion of the microdrops by the latter, although the voltage V M applied to the mother-drops is greater than the Rayleigh voltage, strictly defined in the absence of any influence.
  • this voltage Vc, applied to the deflection drops is chosen to be less than the Rayleigh voltage, so that they do not expel unusable microdrops, giving the process according to the invention a good printing speed.
  • FIG. 3a is the diagram illustrating the process of creation and deflection of the printing drops and FIG. 3b is the diagram illustrating the values of the charge voltages applied to the drops of the ink jet, according to the invention.
  • the inkjet (1) is broken into main drops (30 to 35).
  • the drops (30, 32 and 34) are electrically charged by a voltage V M greater than the Rayleigh voltage to create microdrops (36, 37 and 38) respectively.
  • Two of these microdrops (36 and 37) are deflected respectively by the drops of deflection (31 and 33) which are respectively charged by the voltages (Vc31 and Vc33).
  • the main drop (35) not being electrically charged, it will absorb the microdrop (38) from the drop (34).
  • the deflection angle of the microdrops depends on the voltage Vc which is applied to the deflection drops.
  • Vc33 the charging voltage of the drop (33)
  • Vc31 the charging voltage of the drop (31)
  • the printing of a determined point on the support requires the participation of two drops of the ink jet associated with the following sequence: charging voltage of over-critical value V M , greater than the voltage of Rayleigh, to create the microdrop, then charge voltage of sub-critical value V c between Vc min and Vc max , to deflect this microdrop.
  • FIGS. 4a to 4c are schematically represented exemplary embodiments of the device for charging ink drops, according to three different geometries but all inducing an electric field that is not symmetrical with respect to the axis (D) of the ink jet ( 1).
  • the electrode (70) has the shape of a half-cylinder with an axis coinciding with the axis (D) of the ink jet (1); the electrostatic influence is strong between this electrode (70) and the jet (1), allowing the operation of the printer with low charge voltages of ink drops.
  • the electrode (71) has the shape of a single rectangular plate, of longitudinal axis parallel to the axis (D) of the jet (1).
  • the electrostatic influence between the electrode (71) and the jet (1) is lower than in the previous case but the simple shape and the small size of the electrode facilitates its production and integration at high density.
  • the third example, according to FIG. 4c, represents a compromise solution between the efficiency of the first geometry and the simplicity of the second.
  • the charging electrode (72) consists of two half-planes intersecting in a direction parallel to the axis (D) of the ink jet.
  • the projection method according to the invention has the advantage of allowing an impact of the drops of liquid on the support much smaller than the diameter of the ejection nozzle consequently increasing the precision of the implementation device, therefore the resolution of the printer in the particular case described.
  • the method makes it possible to reduce the number of elements of the liquid projection head and to simplify each of the elements - a single charge electrode is sufficient -.
  • Another advantage lies in the printing of only micro-drops with a low sensitivity to variations in the amplitude of stimulation of the ink jet, since these microdrops are not generated by action on the amplitude or frequency of the excitation leading to the breaking of the ink jet.
  • Another important advantage of the method according to the invention is that it allows the printing of ink drops in frame mode, unlike the methods described in the prior art, that is to say only one ink jet allows the printing of several lines of points corresponding to the modulation of the deflection of said drops.
  • the invention it is possible to envisage interesting industrial applications.
  • the extremely small diameter of the printing microdrop allows the design of a printer usable in all areas requiring a quality of quasi-photographic printing.
  • a prototype printer produced by the Applicant made it possible to obtain microdroplets of diameter of less than 10 microns for a diameter of ejection nozzle equal to 35 microns.
  • the invention is in no way limited to the embodiment which has just been described, obviously including the technical equivalents of the means and combinations thereof if they are used in the context of the following claims.
  • the invention can be implemented in a printing device with several simultaneous continuous ink jets which would be ejected by the same number of nozzles associated with the same reservoir.
  • the invention can also be applied in the layout of printed circuits, the mounting of electronic components or in the manufacture of medicaments as has been said before.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
EP92401840A 1991-07-05 1992-06-29 Procédé de projection de liquide et dispositif d'impression haute-résolution dans une imprimante à jet d'encre continu mettant en oeuvre ce procédé Expired - Lifetime EP0521764B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9108482A FR2678549B1 (fr) 1991-07-05 1991-07-05 Procede et dispositif d'impression haute-resolution dans une imprimante a jet d'encre continu.
FR9108482 1991-07-05

Publications (2)

Publication Number Publication Date
EP0521764A1 EP0521764A1 (fr) 1993-01-07
EP0521764B1 true EP0521764B1 (fr) 1995-06-28

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ID=9414781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401840A Expired - Lifetime EP0521764B1 (fr) 1991-07-05 1992-06-29 Procédé de projection de liquide et dispositif d'impression haute-résolution dans une imprimante à jet d'encre continu mettant en oeuvre ce procédé

Country Status (12)

Country Link
US (1) US5489929A (ko)
EP (1) EP0521764B1 (ko)
JP (1) JPH05246035A (ko)
KR (1) KR100227153B1 (ko)
CN (1) CN1029302C (ko)
AU (1) AU655037B2 (ko)
BR (1) BR9202488A (ko)
DE (1) DE69203166T2 (ko)
DK (1) DK0521764T3 (ko)
ES (1) ES2075650T3 (ko)
FR (1) FR2678549B1 (ko)
IL (1) IL102293A (ko)

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KR101180729B1 (ko) 2010-05-07 2012-09-07 제주대학교 산학협력단 경사형 절연 노즐을 구비하는 정전기 유도 증착 장치 및 이를 이용한 잉크 순환 방법
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CN102922891B (zh) * 2012-10-26 2014-08-06 厦门大学 金属微纳结构电液喷印装置
CN104153012B (zh) * 2014-07-14 2017-04-12 厦门大学 一种锥形微纳光纤制备装置及制备方法
JP6657625B2 (ja) * 2014-09-05 2020-03-04 ソニー株式会社 液滴分取装置、液滴分取方法及びプログラム
CN105772722B (zh) * 2016-03-11 2018-01-23 嘉兴学院 一种控制电流体动力学打印分辨率的控制装置及设备与方法
CN109397880B (zh) * 2018-12-14 2019-09-20 北京赛腾标识系统股份公司 设置喷嘴驱动的装置、方法及喷墨系统
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Publication number Priority date Publication date Assignee Title
AU2009318959B2 (en) * 2008-11-27 2015-08-27 Jordi Nadal Aloy Self-ventilated brake disc

Also Published As

Publication number Publication date
AU1930492A (en) 1993-01-07
CN1070610A (zh) 1993-04-07
CN1029302C (zh) 1995-07-12
ES2075650T3 (es) 1995-10-01
BR9202488A (pt) 1993-03-16
KR100227153B1 (ko) 1999-10-15
EP0521764A1 (fr) 1993-01-07
DK0521764T3 (da) 1995-11-06
DE69203166D1 (de) 1995-08-03
FR2678549A1 (fr) 1993-01-08
IL102293A0 (en) 1993-01-14
IL102293A (en) 1994-10-21
US5489929A (en) 1996-02-06
AU655037B2 (en) 1994-12-01
JPH05246035A (ja) 1993-09-24
KR930002098A (ko) 1993-02-22
DE69203166T2 (de) 1996-01-25
FR2678549B1 (fr) 1993-09-17

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