EP0899105B1 - Elektrostatischer Tintenstrahldruckkopf - Google Patents

Elektrostatischer Tintenstrahldruckkopf Download PDF

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Publication number
EP0899105B1
EP0899105B1 EP19980113591 EP98113591A EP0899105B1 EP 0899105 B1 EP0899105 B1 EP 0899105B1 EP 19980113591 EP19980113591 EP 19980113591 EP 98113591 A EP98113591 A EP 98113591A EP 0899105 B1 EP0899105 B1 EP 0899105B1
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EP
European Patent Office
Prior art keywords
ink
ink jet
recording
recording head
electrode
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
EP19980113591
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English (en)
French (fr)
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EP0899105A2 (de
EP0899105A3 (de
Inventor
Shima Kazuo
Suetsugu Junichi
Mizoguchi Tadashi
Minemoto Hitoshi
Takemoto Hitoshi
Saeki Tomoya
Hagiwara Yoshihiro
Yakushiji Toru
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NEC Corp
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NEC Corp
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Publication of EP0899105A3 publication Critical patent/EP0899105A3/de
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Publication of EP0899105B1 publication Critical patent/EP0899105B1/de
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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
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • 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
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • B41J2002/061—Ejection by electric field of ink or of toner particles contained in ink

Definitions

  • the present invention relates to an electrostatic ink jet recording head whereby printing is performed by using the electrostatic force created by an electric field to discharge ink containing charged toner particles.
  • printer recording technology based on non-impact systems has the advantage that the generation of noise during recording etc. is so small as to be negligible.
  • Ink-jet recording systems in particular, allow printing and recording at high speed directly onto a recording medium, using a simple construction.
  • FIGs. 6 - 9 illustrate a conventional example of a recording head proposed as an ink-jet recording system.
  • This conventional example uses an ink containing toner particles dispersed in a carrier liquid for printing onto recording paper 8.
  • an opposing electrode 7 is also provided at the rear side of the recording paper in a position opposing the recording electrodes 3.
  • an electric field is generated by applying a voltage to the recording electrodes 3 and the opposing electrode 7, and the toner particles in the ink are ejected towards the recording paper 8 by means of the electrostatic force created by the electric field.
  • the ink-jet recording head comprises a substrate 1 made from an insulating material of plastic, or the like, and a base film 2 covering this substrate 1.
  • the base film 2 is made from an insulating material, such as polyimide, and has a thickness of approximately 50 ⁇ m.
  • a plurality of recording electrodes 3 are patterned on the surface of this base film 2.
  • the recording electrodes 3 are formed by plating a conductive material of copper (Cu), or the like, onto the surface of the base film 2 to a thickness of 20 - 30 ⁇ m, and then patterning such that the interval between adjacent electrodes is 300 dpi pitch, namely, about 85 ⁇ m.
  • each recording electrode 3 projects externally (towards the opposing electrode) from one edge of the base film 2 by about 80 - 500 ⁇ m.
  • the surface of the recording electrodes 3 is covered uniformly by a film of insulating coating material 4 to a thickness of 10 ⁇ m or less, as shown in Fig. 7 and Fig. 8, which are enlargements of the portion indicated by arrow A in Fig. 6.
  • a portion of the upper surface of the base film 2 is covered by a cover 5.
  • the cover 5 is formed from an insulating material and is shaped such that it does not interfere with the projecting end portions of the recording electrodes 3.
  • An ink supply inlet 5a and an ink drain outlet (not illustrated) are provided, respectively.
  • the space enclosed by the base film 2 and the cover 5 forms an ink chamber, and ink is introduced via the ink supply inlet 5a such that the ink 6 is always in a full state inside the chamber.
  • a slit-shaped ink spray outlet 5b is formed at the edge of the cover 5, between the cover 5 and the base film 2.
  • the aforementioned end portions of the recording electrodes 3 project through this ink spray outlet 5b.
  • an ink meniscus indicated by symbol 6a is formed at this slit-shaped ink spray outlet 5b.
  • a constant back-pressure is applied to the ink 6 in the ink chamber.
  • the ink 6 forms an ink meniscus 6a having a concave shape at the ink spray outlet 5b. Since the end portions of the recording electrodes 3 project from the base film 2 and the cover 5, when viewed from above as in Fig. 7, the ink meniscus 6a forms a U-shape between adjacent recording electrodes 3. Furthermore, as shown in Fig. 8, when viewed from the side, the ink meniscus 6a has a downward concave shape.
  • the electric field concentrates on the end region of the ink meniscus 6a at the projecting end portion of that electrode. Induced by this electric field, the charged toner in the ink is expelled from the end region of the ink meniscus 6a. This forms an ink drop 6b, as shown in Fig. 7, which is ejected towards the recording paper 8 on the side of the opposing electrode 7 positioned opposite the recording head, and is thereby printed onto the recording paper 8.
  • Fig. 9 shows an approximate diagram of equipotential lines showing the potential generated between the recording electrodes 3 and the opposing electrode 7 during recording in a conventional ink-jet recording head.
  • a first problem is that it is difficult to form the ink into a desired dot size when recording onto recording paper. This is because a high-voltage pulse is supplied to the recording electrode 3 as a recording voltage, and the end portion of the recording electrode 3 itself forms a discharge point 3a for the ink 6. In this process, there is insufficient electrostatic force acting on the toner particles near the discharge point 3a in the direction of the discharge point 3a.
  • the equipotential lines 9 are virtually parallel to the direction of ink discharge, with the exception of the region in front of the discharge point 3a (opposing electrode side). Therefore, insufficient electrostatic force is generated in the direction of the discharge point 3a with respect to toner particles in the vicinity of the discharge point 3a. Since the electrostatic force acting on the toner particles is weak, the amount of toner particles supplied to the discharge point 3a is insufficient for forming the desired dot size.
  • a second problem is that the discharge of ink droplets becomes unstable. This is because the ink meniscus 6a connects continuously across the recording electrodes 3, having vertices at the discharge points 3a, and therefore, the liquid surface in the vicinity of a discharge point 3a which has discharged ink will vibrate and affect the ink meniscus 6a, thus making it impossible to obtain an ink meniscus 6a that is stable at all times.
  • a third problem is the occurrence of ink droplet discharge faults due to excessive concentration of toner particles in the ink spray outlet 5b.
  • the reason for this is that the ink spray outlet 5b in the cover which supplies ink 6 to the discharge points 3a for discharge, is formed in a portion of the ink chamber in the shape of a slit of a size which prevents overflowing of ink. Consequently, no flow of ink 6 is produced at the ink spray outlet 5b, and there is an excessive concentration of toner particles in this region, causing the ink viscosity to rise above the required level.
  • a fourth problem is that, in a conventional electrostatic ink jet recording head as described above, in order to feed recording paper 8 between recording electrode 3 and counter electrode 7, it is necessary to ensure a gap between recording electrode 3 and counter electrode 7 of at least about 0.5 ⁇ 1 mm.
  • a problem with such an electrostatic ink jet recording head is that, in order to effect discharge of ink drops by means of an electrical field between recording electrode 3 and counter electrode 7, the recording voltage needed for discharge of the ink drops must be made high.
  • an ink jet head is provided with a first head member comprising delivery ports which are formed as cylindrical openings on a front plate. Further a second head member is provided having a recessed part detachably receiving the first head member and an ink delivery opening on a front plate which is disposed opposite to said ink delivery ports. A control electrode is provided around the ink delivery ports and a common electrode is provided around the ink delivery opening.
  • An object of the present invention is to reduce a recording voltage.
  • an electrostatic ink jet recording head comprising: a jet member equipped with at least one ink jet terminal projecting towards the recording paper that is fed thereto, an ink supply path for feeding ink containing toner to each ink jet terminal, at least one recording electrode whereby ink from each discharge terminal is made to fly individually towards the recording paper, and a control electrode that attracts the toner arranged between the recording paper and the ink jet terminal.
  • control electrode Since the control electrode is arranged in front of the recording paper, it can be arranged closer to the ink jet terminal than the conventional counter electrode. The voltage applied to the recording electrodes can therefore be lower.
  • a further object of the present invention is to prevent deterioration of printing at high drive frequencies.
  • the recording electrodes are arranged in positions in the vicinity of the ink jet terminals described above.
  • the terminals of the recording electrodes that are closest to the recording paper are then installed in positions further from the recording paper than the respective ink jet terminals.
  • a further object of the present invention is to stabilise discharge of ink drops.
  • two planar surfaces are formed adjacent the jet member described above, and a plurality of parallel grooves are provided from the edge of one planar surface through the boundary line as far as the edge of the other planar surface. These grooves constitute ink supply paths. Recording electrodes are then provided in alternate ones of the plurality of rail-shaped sections defined between the grooves. The portions of the rail-shaped sections where the recording electrodes are provided that project due to the boundary line then constitute ink jet terminals.
  • each ink jet terminal has, arranged on both sides thereof, a rail-shaped section provided with a recording electrode. Consequently, the ink meniscus that is formed at the periphery of each ink jet terminal is partitioned by a rail-shaped section 1 from the ink meniscus of the adjacent ink jet terminal. Effects from the surroundings when the ink flies out can thus be suppressed.
  • a further object of the present invention is to avoid discharge of ink drops being adversely affected by excessive concentrations of toner particles.
  • one terminal of each groove formed in the projecting member is connected with an ink chamber for supply purposes, while the other terminal is connected with an ink chamber for discharge purposes.
  • the ink therefore flows within each groove from one terminal to the other terminal. Poor ink discharge can thereby be prevented since the recording electrode assists part of this flowing ink to fly out, with the result that excess ink cannot accumulate around the ink jet terminal.
  • Fig. 1 is a cross-sectional view of an electrostatic ink jet recording head 10 according to the present invention
  • Fig. 2 is a detail view of Fig. 1
  • Fig. 3 is a perspective view shown partially in cross-section of electrostatic ink jet recording head 10
  • Fig. 4 is a detail view of Fig. 3
  • Fig. 5 is a view showing a discharging portion from above.
  • This electrostatic ink jet recording head 10 comprises the following:
  • a counter electrode 40 that attracts toner is provided opposite the recording head 10 is arranged in a position behind recording paper 41.
  • jet member 20 has two adjacent planar faces 23, 24 and the ink jet terminals 22 are arranged in a row along a boundary line 62 formed at the boundary of these.
  • holding block 25 has a flat face 25a facing recording paper 41; and a recessed face 25b in contact with the two planar faces 23, 24 of the jet member 20.
  • holding block 25 is provided with a discharge port 25c as through hole communicating from recessed face 25b facing the ink jet terminals 22 as far as the flat face 25a.
  • Jet member 20 is a rectangular prismatic block made of insulating material of dielectric coefficient less than 10. As specific examples, ceramics or polymer materials etc. may be employed.
  • This jet member 20 is formed with a plurality of concave/convex shapes that are continuous over the mutually contacting two planar faces 23, 24.
  • These concave/convex shapes are formed by a plurality of parallel grooves 61 on planar faces 23, 24 provided from the top edge of planar face 23 and extending to the bottom edge of planar face 24.
  • the boundary of the two planar faces 23, 24 constitutes the boundary line 62, which projects in the direction in which the ink 50 flies.
  • Grooves 61 are formed along the perpendicular direction with respect to the boundary line 62 of planar faces 23, 24, and all the grooves 61 pass through boundary line 62.
  • These grooves 61 constitute ink supply paths of a plurality of ink jet terminals 22.
  • a plurality of rail-shaped sections 63 are formed defined between these grooves 61. Recording electrodes 31 are installed on alternate ones of these rail-shaped sections 63 on the face corresponding to planar face 23.
  • Ink jet terminals 22 are constituted by the tips of portions of rail-shaped sections 63 that are bent along the boundary line 62 where the recording electrodes 31 are installed. Jet member 20 is held by holding block 25 and coupling block 70 in a condition with the ink jet terminals 22 facing counter electrode 40.
  • Recording electrodes 31 are held within recording electrode substrate 3.
  • This recording electrode substrate 3 comprises a thin plate-shaped insulating substrate or film consisting of polymeric material, respectively independent recording electrodes 31 being formed thereon.
  • the surfaces of recording electrodes 31 are covered by an insulating coating material 32.
  • the thickness of substrate 3 is set less than 10 ⁇ m.
  • this recording electrode substrate 3 is installed at the upper surface of rail-shaped sections 63 in a position retracted by a few tens of ⁇ m from the discharge terminal 22. It thus covers the open portions of grooves 61 that belong to planar face 23 so that ink can flow within grooves 61.
  • the tips (i.e. the portions nearest the recording paper that is fed thereto) of recording electrodes 31 are arranged at the same interval as the desired dot pitch at one end of recording electrode substrate 3.
  • electrode pads for connection to an external driver power source, not shown.
  • the rail-shaped sections 63 of jet member 20 are formed at intervals of 1/2 of the desired dot pitch.
  • Recording electrodes 31 are arranged on the top face of rail-shaped sections 63 along alternate rail sections 63 in a condition with their respective central axes aligned.
  • the width of rail-shaped sections 63 is desirably a width of less than 20 ⁇ m but, in contrast, the width of recording electrodes 31 is set to a width that is greater than this.
  • the rail-shaped sections 63 where recording electrodes 31 are not installed function as partitions. Specifically, these partitions prevent transmission of vibrations of meniscus 52 after discharge of an ink drop 21 from ink jet terminal 22 to a meniscus 52 of another ink jet terminal 22.
  • Holding block 25 is formed of an insulating material (ceramics or polymeric material etc.) of dielectric coefficient less than 10. Its recessed face 25b is provided with a contact face 252b that directly contacts planar face 24 and contact face 251b where the planar face 23 of jet member 20 is in contact through recording electrode substrate 3. This contact face 252b covers the open section of the portion of grooves 61 belonging to planar face 24.
  • Ink can thereby flow within grooves 61.
  • discharge port 25c in the form of minute slits communicating from recessed face 25b to side face 25a.
  • These discharge ports 25c open more widely as they approach side face 25a. Consequently, even if the ink in grooves 61 overflows to discharge port 25c, return to grooves 61 can be rapidly effected.
  • control electrode 64 is installed on holding block 25 above its side face 25a.
  • This control electrode 64 is of flat plate shape along side face 25a and is provided at the periphery of discharge ports 25c. Also, this control electrode 64 is formed with holes 64a for passage of ink corresponding to discharge ports 25c.
  • Control electrode 64 is therefore also positioned nearer to recording paper 41 than ink jet terminals 22.
  • This control electrode 64 consists of conductive material such as metal and is earthed.
  • the toner in ink 50 is positively charged. Consequently, when a positive pulse voltage is applied to recording electrodes 30, ink 50 is attracted towards the side of control electrodes 64, and is easily made to fly towards recording paper 41.
  • Control electrode 64 may be connected to the negative electrode of an external voltage source, not shown.
  • Counter electrode 40 is arranged opposite the side face 25a of holding block 25. This counter electrode 40 is arranged such as to maintain a desired separation from side face 25a. Counter electrode 40 also functions as a platen for transporting recording paper 41. The recording paper 41 that is fed by a feed mechanism not shown, is therefore conveyed along a planar surface of counter electrode 40 facing ink jet terminals 22.
  • this counter electrode 40 is made of conductive material such as metal and is earthed. Consequently, when a positive pulse voltage is applied to the recording electrodes, ink drops 51 fly towards counter electrode 40. Counter electrode 40 may be connected with the negative electrode of an external voltage source, not shown.
  • Coupling block 70 holds jet member 20 from the opposite side to block 25. Jet member 20 is therefore enclosed in a tightly sealed condition by means of the holding block 25 and coupling block 70.
  • This coupling block 70 is provided with an ink chamber 71 for ink supply purposes facing the bottom edge of planar face 24 of jet member 20.
  • This ink chamber 71 is likewise connected to the lower end of each groove 61.
  • An ink supply conduit 71a for supplying ink 50 from outside is connected to this ink chamber 71.
  • this coupling block 70 is provided with an ink chamber 72 for ink discharge purposes facing the upper edge of planar face 23 of jet member 20.
  • This ink chamber 72 is also connected with the upper end of each groove 61.
  • An ink discharge conduit 72a for discharging ink 50 to the outside is connected to this ink chamber 72.
  • an ink tank having a circulatory mechanism is connected to ink supply conduit 71a and ink discharge conduit 72a. In this way, circulation of ink is constantly effected between electrostatic ink jet recording head 10 and the ink tank.
  • ink 50 that is supplied to ink chamber 71 is discharged to ink chamber 72 through grooves 61. Circulation of ink 50 within grooves 61 is therefore performed continuously. It is desirable that the ink chamber 72 for discharge purposes should be arranged above ink chamber 71 for supply purposes in order to prevent any bubbles of air from ink jet terminals 22 that are entrained being left behind in the electrostatic ink jet recording head 10.
  • a migration electrode 13 that effects liquid contact with ink 50 in each groove is installed within ink chamber 71 for supply purposes.
  • This migration electrode 13 is made of a conductive material such as metal, is connected to an external voltage source, not shown, and has a positive voltage applied to it.
  • electrostatic ink jet recording head 10 The operation of electrostatic ink jet recording head 10 will now be described.
  • Circulation of ink 50 is effected with a pressure within a range not exceeding the capillary force of the ink jet terminals 22 that are formed in jet member 20.
  • meniscuses 52 whose apices are the ink discharging terminals 22 are formed on both sides of the ink discharging terminals 22.
  • a fixed bias voltage of the same polarity as the charged toner particles is applied to migration electrode 13. Also, a fixed bias voltage of different polarity from the charged toner particles or of ground level is applied to control electrode 64.
  • a bias voltage of potential lower than that of the control electrode 64 or of the same potential as control electrode 64 is constantly applied to the counter electrode 40.
  • Ink 50 in which toner particles are dispersed is pulled up to a potential such that discharge does not occur, by means of migration electrode 13, and is supplied to each ink jet terminal 22.
  • a drive pulse voltage of the same polarity as the toner is applied from a driver, not shown, to the desired recording electrode 31.
  • an electric field is generated between recording electrode 31 and control electrode 64.
  • An electrostatic force acts on the toner particles in the ink 50 that is supplied to ink jet terminal 22 and, since this exceeds the surface tension of meniscus 52, ink drops 51 containing toner particles are discharged towards counter electrode 40 from the ink jet terminals 22. After passing through discharge port 25c, ink drops 51, maintaining the inertial force produced by their discharge, attach themselves to recording paper 41 on counter electrode 40, thereby effecting printing.
  • the equipotential lines 60 in front of ink jet terminals 22 when recording voltage is applied are formed such as to intersect practically at right angles the discharge direction. Also, an electrostatic force in the forwards direction is generated on toner particles at the side face of ink jet terminal 22. Consequently, toner particles are supplied to the tip of ink jet terminal 22 even whilst recording voltage is being applied. Furthermore, since meniscus 52 is formed in front of recording electrode 31, an ample supply of toner particles can be supplied to the tip of ink jet terminal 22 when recording voltage is applied. Consequently, since the supply of toner particles to ink jet terminals 22 can be altered by changing the time for which recording voltage is applied, dots of any desired diameter can be formed.

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

Claims (15)

  1. Elektrostatischer Tintenstrahl-Aufzeichnungskopf (10) mit:
    (a) einem Strahlelement (20) mit mindestens einer Tintenstrahl-Endstelle (22), die zum Aufzeichnungspapier (41) weist, das diesem zugeführt wird,
    (b) einem Tintenzufuhrweg (61) zum Zuführen von Toner enthaltender Tinte (50) zu der Tintenstrahl-Endstelle (22),
    (c) mindestens einer Aufzeichnungselektrode (31), die bewirkt, daß der Toner enthaltende Tintentropfen (51) von der Tintenstrahl-Endstelle (22) zum Aufzeichnungspapier (41) fliegt,
    (d) einer Steuerelektrode (64), die den Toner enthaltenden Tintentropfen anzieht und zwischen der Tintenstrahl-Endstelle (22) und dem Aufzeichnungspapier (41) angeordnet ist, und
    (e) einem Halteblock (25), der das Strahlelement (20) von der dem Aufzeichnungspapier (41) nächstgelegenen Seite hält, wobei der Halteblock (25) eine flache Fläche (25a), die dem Aufzeichnungspapier (41) zugewandt ist, und eine Ausnehmungsfläche (25b) mit zwei ebenen Flächen (251b, 252b) in Kontakt mit zwei ebenen Flächen (23, 24) des Strahlelements (20) aufweist, und wobei
       der Halteblock (25) eine Ausstoßöffnung (25c) als ein Durchgangsloch aufweist, das eine Verbindung von der der Tintenstrahl-Endstelle (22) zugewandten Ausnehmungsfläche (25b) zur ebenen Fläche (25a) des Halteblocks (25) herstellt, wobei die Ausstoßöffnung (25c) eine Form hat, die von einem Grenzabschnitt der zwei ebenen Flächen (251b, 252b) der Ausnehmungsfläche (25b) zu der flachen Fläche (25a) divergiert.
  2. Elektrostatischer Tintenstrahl-Aufzeichnungskopf (10) nach Anspruch 1, welcher weiter eine Gegenelektrode (40) aufweist, die an einer Position hinter dem Aufzeichnungspapier angeordnet ist, um den Toner anzuziehen, wobei das Aufzeichnungspapier zwischen dem Tintenstrahl-Aufzeichnungskopf (10) und der Gegenelektrode (40) liegt.
  3. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach Anspruch 1 oder 2, wobei die Aufzeichnungselektroden (31) einzeln an Positionen in der Umgebung der Tintenstrahl-Endstellen (22) angeordnet sind und wobei die Aufzeichnungselektrodenanschlüsse, die dem Aufzeichnungspapier am nächsten liegen, an Positionen eingerichtet sind, die weiter vom Aufzeichnungspapier (41) entfernt sind als die Tintenstrahl-Endstellen (22).
  4. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 3, wobei die Steuerelektrode (64) eine flache plattenförmige Elektrode ist, die zwischen den Tintenstrahl-Endstellen (22) und dem Aufzeichnungspapier (41) angeordnet ist und ein Loch (64a) zum Hindurchtreten von Tintentropfen (51), die aus den Tintenstrahl-Endstellen (22) fliegen, aufweist.
  5. Elektrostatischer Tintenstrahl-Aufzeichnungskopf (10) nach einem der Ansprüche 1 bis 4 mit zwei ebenen Flächen (23, 24), deren Grenze eine Grenzlinie (62) definiert, auf der die Tintenstrahl-Endstellen (22) in einer Reihe angeordnet sind, wobei
       der Halteblock (25) mit einer dem Aufzeichnungspapier (41) zugewandten flachen Fläche (25a) die darauf eingerichtete Steuerelektrode (64) aufweist.
  6. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 5, wobei die Steuerelektrode (64) eine plattenförmige Elektrode ist, die am Außenbereich der Ausstoßöffnung (25c) der einen flachen Fläche (25a) des Halteblocks (25) eingerichtet ist, und ein Loch (64a) zum Hindurchtreten von Tinte in der der Ausstoßöffnung (25c) entsprechenden Positionen aufweist.
  7. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 6, wobei der Tintenzufuhrweg in Form zueinander paralleler Rillen (61) ausgebildet ist, die sich zusammenhängend über die ebene Fläche (23) und die ebene Fläche (24) erstrecken, und wobei mehrere durch die Rillen (61) definierte schienenförmige Abschnitte (63) jeweils die Tintenstrahl-Endstellen (22) entlang der Grenzlinie (62) bilden.
  8. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 7, wobei die mindestens eine Aufzeichnungselektrode (31) auf den schienenförmigen Abschnitten (63) eingerichtet ist, die zu der einen oder der anderen der ebenen Flächen (23, 24) gehören.
  9. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 6, wobei der Tintenzufuhrweg in Form zueinander paralleler Rillen (61) ausgebildet ist, die sich zusammenhängend über die ebene Fläche (23) und die ebene Fläche (24) erstrecken, und wobei mehrere durch die Rillen (61) definierte schienenförmige Abschnitte (63) alternierend die Tintenstrahl-Endstellen (22) entlang der Grenzlinie (62) bilden.
  10. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach Anspruch 9, wobei die Aufzeichnungselektroden (31) auf den schienenförmigen Abschnitten (63) mit den Tintenstrahl-Endstellen (22) eingerichtet sind, die zu der einen oder der anderen der ebenen Flächen (23, 24) gehören.
  11. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach Anspruch 10, 'wobei die Breite der Aufzeichnungselektroden (31) auf einen größeren Wert gelegt ist als die Breite der shienenförmigen Abschnitte (63).
  12. Elektrostatischer Tintenstrahl-Aufzeichnungskopf (10) nach einem der Ansprüche 1 bis 11, welcher weiter einen Kopplungsblock (70) zum sandwichförmigen Anordnen des Strahlelements (20) in Zusammenwirken mit dem Halteblock (25) aufweist, wobei der Kopplungsblock (70) eine erste Tintenkammer (71) aufweist, der die Tinte (50) von außen zugeführt wird und die in Verbindung mit den Rillen (61) steht, die auf einer der ebenen Flächen (24) des Strahlelements (20) ausgebildet sind, und wobei der Kopplungsblock weiterhin eine zweite Tintenkammer (72) aufweist, die in Verbindung mit den Rillen (61) steht, die an der anderen ebenen Fläche (23) des Strahlelements (20) ausgebildet sind, um die Tinte auszustoßen.
  13. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach Anspruch 12, welcher weiter eine Migrationselektrode (13) aufweist, die innerhalb der Tintenkammer (71) eingerichtet ist und direkt in Kontakt mit Tinte (50) steht und an die eine Spannung mit der gleichen Polarität wie der Toner in der Tinte (50) angelegt ist.
  14. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 13, wobei die Aufzeichnungselektroden (31) von einem Film aus einem isolierenden Beschichtungsmaterial bedeckt sind.
  15. Elektrostatischer Tintenstrahl-Aufzeichnungskopf nach einem der Ansprüche 1 bis 14, wobei das Strahlelement (20) und der Halteblock (25) aus einem isolierenden Material mit einer Dielektrizitätskonstante von weniger als 10 bestehen.
EP19980113591 1997-07-22 1998-07-21 Elektrostatischer Tintenstrahldruckkopf Expired - Lifetime EP0899105B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP19576797 1997-07-22
JP195767/97 1997-07-22
JP19576797A JP2937955B2 (ja) 1997-07-22 1997-07-22 静電式インクジェット記録ヘッド

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EP0899105A2 EP0899105A2 (de) 1999-03-03
EP0899105A3 EP0899105A3 (de) 1999-11-24
EP0899105B1 true EP0899105B1 (de) 2003-05-28

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Publication number Priority date Publication date Assignee Title
US6604816B1 (en) 1999-06-30 2003-08-12 Hitachi, Ltd. Ink-jet recording head and ink-jet recorder
GB0000368D0 (en) 2000-01-07 2000-03-01 Xaar Technology Ltd Droplet deposition apparatus
JP2006264053A (ja) 2005-03-23 2006-10-05 Fuji Photo Film Co Ltd インクジェットヘッドおよびインクジェット記録装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS594310B2 (ja) * 1979-06-30 1984-01-28 株式会社リコー インクジェット記録装置
JPS60131252A (ja) * 1983-12-20 1985-07-12 Fuji Xerox Co Ltd インクジエツトプリンタ用記録ヘツド
JP2768080B2 (ja) * 1990-11-28 1998-06-25 松下電器産業株式会社 インクジェット記録装置
AU664404B2 (en) 1991-12-18 1995-11-16 Tonejet Limited Method and apparatus for the production of discrete agglomerations of particulate matter
JP2775544B2 (ja) * 1992-01-31 1998-07-16 松下電器産業株式会社 インクジェット記録装置
GB9601226D0 (en) * 1996-01-22 1996-03-20 The Technology Partnership Plc Ejection apparatus and method
JPH09195767A (ja) 1996-01-23 1997-07-29 Toyota Motor Corp 冷却ファン制御装置
EP0847859B1 (de) * 1996-12-13 2002-10-16 Nec Corporation Elektrostatischer Tintenstrahldruckkopf
JP2990121B2 (ja) * 1997-09-04 1999-12-13 新潟日本電気株式会社 静電式インクジェット記録装置

Also Published As

Publication number Publication date
EP0899105A2 (de) 1999-03-03
DE69815000T2 (de) 2003-12-04
DE69815000D1 (de) 2003-07-03
JPH1134338A (ja) 1999-02-09
EP0899105A3 (de) 1999-11-24
JP2937955B2 (ja) 1999-08-23

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