EP0764529B1 - Elektrostatischer Tintenstrahlaufzeichnungskopf - Google Patents

Elektrostatischer Tintenstrahlaufzeichnungskopf Download PDF

Info

Publication number
EP0764529B1
EP0764529B1 EP19960250175 EP96250175A EP0764529B1 EP 0764529 B1 EP0764529 B1 EP 0764529B1 EP 19960250175 EP19960250175 EP 19960250175 EP 96250175 A EP96250175 A EP 96250175A EP 0764529 B1 EP0764529 B1 EP 0764529B1
Authority
EP
European Patent Office
Prior art keywords
ink
recording
cover member
tip end
jet recording
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
EP19960250175
Other languages
English (en)
French (fr)
Other versions
EP0764529A3 (de
EP0764529A2 (de
Inventor
Ryosuke Uematsu
Junichi Suetsugu
Kazuo Shima
Hitoshi Minemoto
Yoshihiro Hagiwara
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Publication of EP0764529A2 publication Critical patent/EP0764529A2/de
Publication of EP0764529A3 publication Critical patent/EP0764529A3/de
Application granted granted Critical
Publication of EP0764529B1 publication Critical patent/EP0764529B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 ink-jet recording head, and more particularly, to an electrostatic ink-jet recording head for ejecting ink particle by electrostatic forces to effect printing on a piece of recording paper.
  • a non-impact recording method is superior in that an extremely small noise is generated during the printing.
  • the ink-jet recording method is considered a very excellent recording because a high speed recording may be attained on a normal paper with a simple mechanism.
  • a variety of methods therefor have heretofore been proposed.
  • the ink-jet recording methods falls into the following categories: a method in which pressure waves are generated in an ink chamber by a piezoelectric element to thereby eject ink from a nozzle for recording, another method in which ink is ejected from a nozzle by bubbles generated by heat, and an electrostatic recording method.
  • a method in which pressure waves are generated in an ink chamber by a piezoelectric element to thereby eject ink from a nozzle for recording another method in which ink is ejected from a nozzle by bubbles generated by heat
  • an electrostatic recording method by which a size of ink droplets may readily be controlled will hereinafter be noticed.
  • the electrostatic ink-jet recording apparatus is provided an opposite electrode disposed on a back side of the recording paper, and a ink-jet recording head for ejecting ink particle to the recording paper.
  • the ink-jet print head has stylus electrodes confronting with an opposite electrode. A voltage is applied to the electrodes so that an electric field generated by the application causes the ink particle such as charged toner or the like to fly toward the opposite electrode.
  • Fig. 1 is a schematic perspective view showing a conventional electrostatic ink-jet printing apparatus.
  • a top surface of a base plate 52 of an ink-jet recording head 50 is covered by a cover 54.
  • Slit-like ink ejection holes 55 for holding the ink are provided therein.
  • a plurality of recording electrodes 53 are disposed in parallel along the ink emission direction. They are provided on the surface of the base plate 52. These recording electrodes 53 are connected to a voltage driving section (not shown). A high voltage pulse is applied selectively to the recording electrodes 53 during the printing.
  • an opposite electrode 51 is disposed through the recording paper P on a line extending from the recording electrodes 53, thereby generating an electric field together with the recording electrodes 53 during the recording.
  • the recording electrodes 53 are formed into styli, the electric field is concentrated on a tip end of each recording electrode 53, and charge is accumulated on the ink located near to the recording electrodes.
  • the ink in which color particle is dispersed is used and the color particle (charged toner) is ejected for recording, it is possible to carry out the recording without any bleeding of ink irrespective of the kind of the recording paper. For this reason, for the ink-jet recording apparatus shown in Fig. 1, it is preferable to use ink in which the color particle is dispersed.
  • the color particle contained in the ink solution is subjected to a strong attractive force toward the opposite electrode 51 side in Fig. 1, i.e., in a direction toward the recording paper P by a Coulomb force generated by the charge accumulated by the recording electrodes 53. If the Coulomb force overcomes the surface tension of the ink, the ink is ejected to stick to the recording paper P. In this way, in response to an image to be recorded, a high voltage pulse is applied to the recording electrodes 53 to thereby carry out a desired recording operation.
  • the conductivity or inductivity of the ink to be used for recording is larger than the conductivity or inductivity of air, a position where the electric field is concentrated is not only determined by the arrangement of the recording electrodes, but the shape of ink meniscus formed on the ink ejection port is affected.
  • the ink meniscus is uniform in the longitudinal direction of the ink ejection ports.
  • fine irregularity is formed on the surface of the ink meniscus due to the machining allowance of the opening portions, the vibration of the meniscus after the ink ejection, the natural swing of the meniscus, and the like.
  • the electric field is concentrated on the convex portions of the fine corrugation of the meniscus generated in the vicinity of the recording electrode by the relationship of the conductivity and inductivity of the ink. Then, when the shape of the meniscus begins to be deformed by the Coulomb force, the concentration of the electric field is further promoted. As a result, the position where the ink flies is minutely displaced due to the irregularity of the fine meniscus in the initial stage. If this occurs, even if a high voltage pulse is applied to a certain recording electrode, the ink would fly from a position displaced from the recording electrode. As a result, there are cases where it would be impossible to carry out the recording on a desired position. This leads to degradation in printing quality.
  • the electrostatic ink-jet recording head has convex portions 66 at a tip end position of the recording electrode 63 at a tip end portion of the base plate 62 as shown in Fig. 2.
  • the convex and concave shapes corresponding to the shape of the convex portion 66 are applied to the ink meniscus formed in the vicinity of the tip ends of the recording electrodes 63.
  • the electric field at the tip ends of the recording electrodes 63 is concentrated onto the convex portions 66.
  • the charged color particle in the ink migrates toward the tip ends (tip ends of the convex portions 66) of the meniscus in accordance with the electric field in the ink to thereby first fly.
  • the ink-jet recording head shown in Fig. 2 for example, in the case where the resolving power of the printer is set at 11,8 dots/mm (300 dpi), it is necessary to set up the arrangement pitch of the recording electrodes 63 to about 85 ⁇ m. Therefore, the fine convex and concave portions must be formed at the tip end of the base plate 62 corresponding to the recording electrodes having such a fine pitch. For this reason, the base plate material and the machining process are largely limited, causing an increased cost, disadvantageously.
  • the base plate 62 In order to meet a sufficient mechanical strength of the base plate 62, the latter needs a thickness of 100 ⁇ m or more, whereas the pitch of the convex and concave portions to be machined must be one fifth or sixth of this thickness or less. Accordingly, the machining is extremely difficult, and also a cost for manufacture is increased, disadvantageously.
  • Fig. 2 it is possible to form the base plate 62 of thin and soft material by providing a reinforcement plate 67 at a position where the recording electrodes 63 are partitioned.
  • this degrades the mechanical strength of the convex portions of the tip end of the base plate. Accordingly, when the head tip portion is to be cleaned, or the recording paper is jammed, it is disadvantageous that it is likely that the convex portions of the tip end of the base plate is damaged.
  • the direction of the electric field in the vicinity of the recording electrodes diverges (in directions indicated by arrows) from the recording electrodes as shown in Fig. 3, the migration of color particle does not occur toward the meniscus end on the axes of the recording electrodes or does not smoothly occur. As a result, the performance for the high speed and continuous ejection of the ink has to be improved to some extent.
  • an object of the present invention is to provide an electrostatic ink-jet recording head which may readily be manufactured at low cost to thereby rapidly eject color particle in ink in a stable manner.
  • At least one convex portion is formed at a tip end portion of said cover member on the ink ejection side, and a tip end portion of the convex portion is set to project in the ink ejection direction beyond the tip end portion of the base plate on the ink ejection side.
  • the ink meniscus when the ink containing the color particle is filled in the ink flow path, the ink meniscus is formed along the shape of the convex portion of the cover member.
  • the electric field is diverged from the recording electrode, it is concentrated on the tip end portion of the cover member along the shape of the surface of the ink meniscus due to the relationship of the conductivity and inductivity of the ink and air.
  • the concentration of the electric field the color particle (charged toner) in the ink migrates toward the tip end of the meniscus and the color particle flies from the tip end of the cover member together with the ink solution.
  • the convex portion of the cover member on the ink ejection side projects beyond the tip end portion of the base plate, the electric field from the tip end of the recording electrode concentrates to the meniscus on the tip end portion of the convex portion. It is therefore possible to rapidly supply color particle to the meniscus end portion, and to carry out the recording at a high speed with high precision.
  • a plurality of stylus recording electrodes are arranged in parallel in a longitudinal direction along the ink ejection direction and a sawtoothed portion is formed on the ink ejection side of the cover member.
  • the convex portions form convex portions of said sawtoothed portion, and the convex portions are arranged so as to overlap lines extending from the stylus recording electrodes.
  • the convex ink meniscus is formed corresponding to the sawtoothed shape, the electric field diverged from the recording electrode concentrates on the tip end of the convex portion of the ink meniscus, and the color particle is effectively ejected from the tip end of the convex portion.
  • an electrostatic ink-jet recording head includes a base plate 1, a plurality of recording electrodes 2 formed on a too surface of the base plate 1 for generating an electric field for the ink ejection, a cover member 4 for forming slit-like ink flow paths 3 in an ink ejection direction (indicated by arrow A) along the recording electrodes 2, and ink ejection ports 5 formed at a tip end portion on the ink ejection side of the slit-like ink flow paths 3.
  • the tip end portion of the cover member 4 on the ink ejection side has a shape which projects beyond the tip end portion of the base plate 1 on the ink ejection side in the ink ejection direction.
  • the recording electrodes 2 are formed into styli in the longitudinal direction along the ink ejection direction. Also, the tip end portion of the cover member 4 on the ink ejection side are formed into sawteeth. A plurality of convex portions 12 form the sawteeth having sharp-pointed ends, and they are arranged so as to overlap on a line extending from each stylus recording electrode 2.
  • the base plate 1 is formed of insulating material such as glass.
  • the recording electrodes 2 one formed by patterning through a photo-lithographic method after nickel, chromium or the like has been sputtered on a surface, on the cover member side, of the base plate 1.
  • the recording electrodes 2 are arranged at 11,8 dots/mm (300 dpi), i.e., at an interval of about 85 ⁇ m. Also, as shown in Figs. 5 and 6, the tip end portion of each recording electrode 2 is covered by an insulating layer 6.
  • the cover member 4 is formed by molding resin such as polysulphone or the like.
  • the cover member 4 is mounted to face the base plate 1.
  • slit-like ink flow paths 3 are formed inside of the cover member 4 and an ink 9 is contained in the ink flow path 3.
  • the ink ejection ports 5 are formed at the tip end portion of the cover member 4.
  • the ink ejection ports 5 are formed by thickening the cover member 4. In other words, the ink ejection ports 5 are narrowed portions of the ink flow paths 3.
  • Three side walls of the cover member 4 form the side surface of the ink flow paths 3 and they are intimately contacted with the base plate 1. With this arrangement, the ink flow paths 3 are closed except for the ink ejection ports 5.
  • the ink recirculation ports 7 are provided on the top surface of the cover member 4 and are connected to an ink cartridge (not shown) via a pair of tubes (not shown). Then, under the condition that vacuum pressure at about 1 cmH 2 0 is applied to the ink 9 in the ink flow paths 3, the ink recirculation is forcibly effected.
  • the recording ink is of a type such that color fine particles (toner) made of thermoplastic resin color are dispersed in liquid of petroleum type organic solution (isoparaffin hydrocarbon) together with charge controlling agent.
  • the color particle is a charged toner which has been nominally charged with a positive polarity by Zeta potential.
  • a plurality of path separators 4a of the cover member 4 are formed at positions where the adjacent recording electrodes 2 are partitioned.
  • the path separators 4a are arranged so as to be in contact with the insulating layer 6 provided on the base plate 1 between the convex portions 12 of the cover member 4.
  • an ink meniscus 8 is formed on the ink 9 at each ink ejection port 5 by the surface tension.
  • the negative pressure is applied to the ink 9 within the ink flow path 3, and also, the tip end portions of the convex portions 12 at the tip end of the cover member 4 project beyond the tip end of the base plate 1 in the ink ejection direction.
  • the ink meniscus 8 takes a concave surface shape slanted upwardly with an apex at the convex portion 12 as viewed from the side in Fig. 6. Furthermore, the ink meniscus 8 projects along the convex portion 12 as viewed from above as shown in Fig. 5.
  • the electric field is formed from the recording electrode 2 to the opposite electrode (not shown) (corresponding to the opposite electrode 51 in Fig. 1), i.e., toward the recording paper.
  • the direction of the electric field in the vicinity of the tip end of the recording electrode 2 is such that it diverges from the recording electrode 2.
  • the charged toner in the ink 9 migrates in the ink along the electric field. As shown by the arrow in Fig. 8, a part of charged toner migrates directly toward the tip end portion of the meniscus 8. Also, another part of charged toner first migrates toward the ink meniscus surface and thereafter migrates to the meniscus end portion along the surface shape of the meniscus 8.
  • the charged toner which has been concentrated on the tip end portion of the meniscus 8 is drawn by the strong electric field concentrated on the tip end portion of the meniscus and, as shown in Fig. 5, becomes a charged toner group 10 containing the ink solution to fly toward the opposite electrode (not shown), i.e., the recording paper to thereby perform the recording.
  • the toner sticking on the recording paper to form the recording dots is heated by a heater (not shown) and fixed.
  • the charge corresponding to the amount of charge held in the charged toner group 10 which has flown is supplied to the ink 9 in the vicinity of the ink ejection part 5 from the portion which is not covered by the insulating layer 6 of the recording electrode 2.
  • the electric balance is always kept.
  • the ink meniscus 8 projects along the convex portion 12 as shown in Fig. 5.
  • the component in the tangent direction of the electric field with the meniscus 8 is toward the tip end of the meniscus 8 and its component becomes large. Accordingly, it is possible to rapidly supply the meniscus tip end portion with charged toner and to carry out high speed recording with high precision.
  • the tip end portion of the cover member 4 is formed in the sawteeth, and the position of the convex portion 12 for forming the sawteeth is overlapped with a line extending from the stylus recording electrode 2.
  • the ink meniscus 8 has an apex corresponding to the convex portion 12 of the cover member 4. For this reason, it is possible to more effectively concentrate the electric field diverging from the recording electrode 2 onto the convex portion 12, and to rapidly carry out the supply of the charged toner to the tip end portion of the meniscus. At the same time, it is possible to carry out the high speed printing with high precision by using the plurality of recording electrodes 2.
  • the sawtoothed portion for concentration of the electric field is formed not on the base plate 1 but on the cover member 4, it is possible to widen the variety of selection of the base plate material. Also, it is possible to widen the freedom of selection of the formation process for the recording electrode arranged on the base plate 1 with high precision. As a result, by selecting the low cost material which would not be suitable in the conventional example due to the machining problem and using an easy process, it is possible to reduce the manufacture cost. Moreover, the thickness of the plate of the cover member 4 is made to one which is suitable for machining, it is possible to facilitate the machining of the sawtoothed portion, to thereby further reduce the manufacture cost.
  • the cover member 4 is made of moldable material, it is possible to impart sufficient mechanical strength to the sawtoothed portion formed at the tip end portion on the ink ejection side. Thus, it is possible to prevent the damage of the sawtoothed irregularity portion due to the cleaning of the head tip portion and the clogging of the ports.
  • the dielectric strength between the recording electrode 2 and the opposite electrode may be increased, and it is possible to effectively avoid such a disadvantage that an excessive current would flow due to the generation of jamming of the recording paper or the like to damage the drive device or the like.
  • the cover member 4 may be made of other material. Also, for the electrostatic ink-jet recording head in accordance with the embodiment, the insulating layer 6 is formed after the recording electrode 2 has been printed first on the surface of the base plate 1, and thereafter, the cover member 4 which is separately machined is mounted on the base plate 1. Such an order of the manufacture process is preferable.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (7)

  1. Elektrostatischer Tintenstrahlaufnahmekopf, der Tinte verwendet, die Farbpartikel enthält, die mit einer vorbestimmten Polarität geladen sind, umfassend eine Grundplatte (1), mindestens eine Aufnahmeelektrode (2), die auf einer Oberfläche der Grundplatte zum Erzeugen eines elektrischen Feldes zum Tintenausstoß gebildet ist; ein Abdeckteil (4) zur Bildung eines Tintenstromweges (3) in einer Tintenausstoßrichtung auf der Oberfläche der Grundplatte, wo die Aufnahmeelektrode gebildet ist; und eine Tintenausstoßöffnung (5), die in einem Spitzenendabschnitt des Tintenstromweges zum Ausstoßen der Tinte gebildet ist, dadurch gekennzeichnet, daß mindestens ein konvexer Abschnitt (12) an einem Spitzenendabschnitt des Abdeckteils gebildet ist und in die Tintenausstoßrichtung vorsteht, und daß der konvexe Abschnitt so gesetzt ist, daß er über ein Spitzenendabschnitt der Grundplatte in der Tintenausstoßrichtung hinausragt.
  2. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 1, wobei der konvexe Abschnitt (12) ein scharfes/spitzes Ende aufweist.
  3. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 2, wobei eine Mehrzahl Aufnahmeelektroden (2) auf der Oberfläche der Grundplatte ausgebildet sind und parallel in Längsrichtung entlang der Tintenausstoßrichtung angeordnet sind, und ein Sägezahnabschnitt an dem Spitzenende des Abdeckteils ausgebildet ist, um eine Mehrzahl konvexer Abschnitte (12) zu bilden, wobei die konvexen Abschnitte so angeordnet sind, daß sie sich auf einer Linie, die sich von den Schreibelektroden erstreckt, überlappen.
  4. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 2, wobei das Abdeckteil (4) aus einem formbaren Material hergestellt ist.
  5. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 2, wobei ein Spitzenendabschnitt der Schreibelektrode (2) mit Isoliermaterial bedeckt ist.
  6. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 3, wobei das Abdeckteil (4) Wegseparatoren (4a) zum Separieren des Tintenflußweges (3) aufweist, und daß die Wegseparatoren an Positionen ausgebildet sind, wo die Aufnahmeelektroden (2) getrennt sind.
  7. Elektrostatischer Tintenstrahlaufnahmekopf nach Anspruch 2, wobei die Tintenausstoßöffnung (5) durch Verdickung des Abdeckteils gebildet ist, um den Tintenflußweg zu verengen.
EP19960250175 1995-08-16 1996-08-15 Elektrostatischer Tintenstrahlaufzeichnungskopf Expired - Lifetime EP0764529B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP20886395A JP2842318B2 (ja) 1995-08-16 1995-08-16 静電式インクジェット記録ヘッド
JP20886395 1995-08-16
JP208863/95 1995-08-16

Publications (3)

Publication Number Publication Date
EP0764529A2 EP0764529A2 (de) 1997-03-26
EP0764529A3 EP0764529A3 (de) 1997-08-13
EP0764529B1 true EP0764529B1 (de) 1999-07-28

Family

ID=16563374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960250175 Expired - Lifetime EP0764529B1 (de) 1995-08-16 1996-08-15 Elektrostatischer Tintenstrahlaufzeichnungskopf

Country Status (3)

Country Link
EP (1) EP0764529B1 (de)
JP (1) JP2842318B2 (de)
DE (1) DE69603426T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2859242B2 (ja) * 1997-04-04 1999-02-17 新潟日本電気株式会社 静電式インクジェット記録ヘッド
JP2005329558A (ja) 2004-05-18 2005-12-02 Fuji Photo Film Co Ltd インクジェット記録方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58179663A (ja) * 1982-04-14 1983-10-20 Nippon Telegr & Teleph Corp <Ntt> インク記録用ヘツド
JPS60228162A (ja) * 1984-04-26 1985-11-13 Tokyo Electric Co Ltd インクジエツトプリンタヘツド
ATE185285T1 (de) * 1991-12-18 1999-10-15 Tonejet Corp Pty Ltd Methode und vorrichtung zur herstellung von diskreten agglomeraten von einem teilchenförmigen material

Also Published As

Publication number Publication date
DE69603426T2 (de) 2000-01-27
JP2842318B2 (ja) 1999-01-06
EP0764529A3 (de) 1997-08-13
EP0764529A2 (de) 1997-03-26
JPH0952366A (ja) 1997-02-25
DE69603426D1 (de) 1999-09-02

Similar Documents

Publication Publication Date Title
US6511172B2 (en) Printing apparatus
US5610643A (en) Ink jet printing head having a detachable pressure chamber
EP2228218A1 (de) Bilderzeugungsvorrichtung und Verfahren zur Korrektur von Schleier
US6318842B1 (en) Liquid jet printing head and liquid jet printing apparatus provided with said liquid jet printing head
US6729716B2 (en) Liquid drop jet head and ink jet recording apparatus
EP0764529B1 (de) Elektrostatischer Tintenstrahlaufzeichnungskopf
JPH04197638A (ja) インクジェット記録装置
US20050206682A1 (en) Liquid ejecting apparatus and liquid ejecting method
JP2937961B2 (ja) 静電式インクジェット記録装置
EP0761442B1 (de) Elektrostatischer Tintenstrahlaufzeichnungskopf mit mehreren Trennwänden in Tintenstrahlrichtung
JP2737707B2 (ja) インクジェット式プリントヘッド
JP2000233499A (ja) アクチュエータ及びインクジェットヘッド並びにインクジェット記録装置
EP0778135B1 (de) Elektrostatisches Tintenstrahlaufzeichnungsgerät
JP2005096172A5 (de)
EP0836943A2 (de) Elektrostatischer Tintenstrahldrucker und Tintenstrahlkopf
JP3367840B2 (ja) インクジェット記録装置
EP0813965A2 (de) Elektrostatischer Tintenstrahldrucker mit Gateelektrode und Druckkopf dafür
JP4064312B2 (ja) 立体イメージの形成方法
EP0899105A2 (de) Elektrostatischer Tintenstrahldruckkopf
JP2004074582A (ja) インクジェットヘッド及びインクジェット記録装置
JPH06183016A (ja) インクジェット記録装置
JP2004174724A (ja) 液滴吐出ヘッド及びインクジェット記録装置
JPH05261905A (ja) インクジェットヘッド
JP3880188B2 (ja) 画像形成装置
JP2005053123A (ja) 液滴吐出ヘッド及び画像形成装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19970816

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19980904

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69603426

Country of ref document: DE

Date of ref document: 19990902

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060808

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060809

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060810

Year of fee payment: 11

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070815

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20080430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070815