EP0822075B1 - Tête d'enregistrement à jet d'encre électrostatique - Google Patents

Tête d'enregistrement à jet d'encre électrostatique Download PDF

Info

Publication number
EP0822075B1
EP0822075B1 EP19970113252 EP97113252A EP0822075B1 EP 0822075 B1 EP0822075 B1 EP 0822075B1 EP 19970113252 EP19970113252 EP 19970113252 EP 97113252 A EP97113252 A EP 97113252A EP 0822075 B1 EP0822075 B1 EP 0822075B1
Authority
EP
European Patent Office
Prior art keywords
ink jet
jet recording
recording head
head
head body
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
EP19970113252
Other languages
German (de)
English (en)
Other versions
EP0822075A3 (fr
EP0822075A2 (fr
Inventor
Kazuo Shima
Junichi Suetsugu
Ryosuke Uematsu
Tadashi Mizoguchi
Hitoshi Minemoto
Hitoshi Takemoto
Yoshihiro Hagiwara
Toru Yakushiji
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
Priority claimed from JP20236496A external-priority patent/JP2826516B2/ja
Priority claimed from JP20176096A external-priority patent/JP2826513B2/ja
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0822075A2 publication Critical patent/EP0822075A2/fr
Publication of EP0822075A3 publication Critical patent/EP0822075A3/fr
Application granted granted Critical
Publication of EP0822075B1 publication Critical patent/EP0822075B1/fr
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 electrostatic ink jet recording head and, more particularly, to an electrostatic ink jet recording head for recording by ejecting ink droplets containing toner particles in an electrostatic field.
  • an ink jet recording head has several advantages of high-speed recording, simple mechanism, direct recording onto plain paper etc.
  • Various mechanisms for the ink jet recording head have been heretofore proposed.
  • Examples of the proposed ink jet recording head include an electrostatic ink jet recording head, wherein a driving pulse is applied between a plurality of stylus ejecting electrodes or recording electrodes of a head body and an opposite electrode opposed to the ejecting electrodes with the recording medium disposed therebetween.
  • Fig. 1 shows a head body of this type of the conventional electrostatic ink jet recording head described in JP-A-07-120252 (or JP-B-8-309 993) in a perspective view.
  • the head body 100 of the ink jet recording head shown in Fig. 1 comprises a planar substrate 101 made of an insulator, on which a plurality of ejecting electrodes 102 extending along the longitudinal direction of the head body 100 are arranged in accordance with the desired resolution along the transverse direction.
  • the ejecting electrodes 102 are formed by sputtering a metal such as Cu or Ni on the entire surface of the substrate 101 and a subsequent photolithographic etching step using a mask pattern for the ejecting electrodes 102.
  • the ejecting electrodes 102 are connected to respective output lines of a printing driver not shown in the drawings, and selectively applied therefrom with a high voltage driving pulse during a recording operation.
  • an insulator resin is applied by a spin-coating technique to insulate the ejecting electrodes 102 from liquid ink.
  • Meniscus elements 103 overlap the respective ejecting electrodes 102 except for the tip portion of the ejecting electrodes 102 for forming an ink meniscus in the vicinity of each ejecting electrode 102.
  • the meniscus elements 103 are made of a photosensitive polymer film laminated on the ejecting electrodes 102 and insulator substrate 101 and patterned by a photolithographic technology.
  • a top cover plate 104 made of an insulator is disposed above the meniscus elements 103 to define an ink chamber between the top cover plate 104 and the insulator substrate 101.
  • the front edge of the cover plate 104 is located slightly behind the tips of the meniscus elements 103 and the front edge of the insulator substrate 101.
  • the top cover 104 has an ink inlet port 105 and an ink outlet port 106 for circulation of the liquid ink.
  • the gap between the front edge portion of the insulator substrate 101 and the front edge of the top cover plate 104 constitutes an ink jet slit 107, from which the meniscus elements 103 protrude together with the tips of the ejecting electrodes 102.
  • the meniscus elements 103 extend backwards below the top cover plate 104 for supporting the front edge of the same.
  • the liquid ink supplied from the ink inlet port 105 through the ink chamber passes the ink jet slit 107 and is supplied in the vicinity of the tips of the meniscus elements 103 to form an ink meniscus 108 around the meniscus elements 103.
  • One of the problems to be solved by the present invention in the conventional electrostatic ink jet recording head as mentioned above is that the supply rate of the liquid ink cannot follow the desired high- speed operation of the ink jet recording head.
  • the inventors have found that this is partly because the meniscus elements are formed on the ejecting electrodes by a photolithographic technology, which limits the thickness of the meniscus elements below several tens of micrometers. The small thickness of the meniscus elements increases the flow resistance at the ink jet slit against the liquid ink.
  • Another problem to be solved by the present invention is that the meniscus elements cannot provide a stable configuration of the meniscuses. This is attributable to the photolithographic technique in the process for forming the meniscus elements, which causes an unstable configuration of the ink meniscus. Location of the tips of the meniscus elements at the position which is located behind the front edge of the substrate is another reason.
  • EP-A-813 966 (Art 54(3)EPC) discloses an electrostatic ink jet recording head comprising a head body defining an ink chamber for receiving liquid ink, said head body having a front edge and a rear edge, and an opposing electrode opposing said front edge, said ink jet recording head ejecting the liquid ink from said head body toward said opposing electrode during a recording operation, wherein said head body includes an insulating substrate having a plurality of stripe protrusions arranged in the vicinity of said front edge, and an ejecting electrode disposed in association with said stripe protrusion.
  • US-A-4, 504, 844 discloses an on-demand inkjet printing head with a pluralily of ink passage ways in the head.
  • an object of the present invention to provide an electrostatic ink jet recording head capable of operating in a stable manner at a high speed by improving the structure of the meniscus elements.
  • the protrusion functions as a meniscus element which can be formed with a stable configuration and have a sufficient thickness desired for the meniscus element to thereby obtain a stable ink supply. Accordingly, a stable and high-speed operation of the electrostatic ink jet recording head can be obtained.
  • a head body 10 of an electrostatic ink jet recording head according to a first embodiment of the present invention comprises a base plate 13, and an elongate head substrate 16 mounted on the front edge portion of the base plate 13.
  • the elongate head substrate 16 extends in the transverse direction of the base plate 13 with the front edge of the head substrate 16 aligned with the front edge of the base plate 13.
  • the head substrate 16 has a plurality of stripe protrusions 12 extending parallel to each other from the front edge of the head substrate 16 to the rear edge thereof in the longitudinal direction of the head body 10.
  • the head body 10 further comprises ejecting electrodes 17 mounted on top of each stripe protrusion 12 of the head substrate 16 and having pointed tips in the vicinity of the front edge of the head substrate 16, a top cover plate 15 overlying the base plate 13 from the front edge portion of the base plate 13 to a location adjacent to the rear edge portion of the base plate 13 for defining an ink chamber 14 together with the base plate 13, and a plurality of electrode pads 18 arranged in the rear edge portion of the base plate 13 and each connected to a corresponding ejecting electrode 17 through a corresponding signal line 19 formed on the base plate 13.
  • a channel region 32 is formed between each two of the stripe protrusions 12 for flowing the liquid ink from the ink chamber 14.
  • the stripe protrusion 12 constitutes a meniscus element for forming a separate ink meniscus 11 at the front end portion of each channel region 32.
  • the stripe protrusion 12 also supports the front edge portion of the top cover plate 15.
  • the front edge of each ink meniscus 11 is substantially straight as viewed perpendicular to the head substrate 16, and of a U shape as viewed along the longitudinal direction of the head body 10.
  • the channel region 32 has a small width for having a capillary function, and has a thickness larger than the width to allow a sufficient ink flow at a high rate.
  • the top cover plate 15 has a front edge for defining an ink jet slit 36, which is located slightly behind the front edge of the head substrate 16, the front ends of the stripe protrusions 12 and the tips of the ejecting electrodes 17.
  • the top cover plate 15 has an ink inlet port 20 and an ink outlet port not shown in Fig. 3, similarly to the conventional ink jet recording head.
  • the head substrate 16 is made of an insulator such as glass, and the ejecting electrodes 17 are made of a metal such as Ni or Cu.
  • the head substrate 16 is formed to define the stripe protrusions 12 and channel regions 32 alternately arranged in the transverse direction of the head body 10 with a constant pitch, which corresponds to a desired resolution of the printing.
  • Each channel region 32 supplies the liquid ink 11 from the ink chamber 14 to the front edge of the head substrate 16, and provides a sufficient space for holding an ink meniscus 11 at the front end of the channel region 32.
  • the base plate 13 is made of an insulator, on which the electrode pads 18 together with the signal lines 19 are formed by a photolithographic technique to supply high positive voltage driving voltages to the ejecting electrodes 17.
  • each signal line 19 is connected to the rear end of a corresponding ejecting electrode 17 by wire bonding, and the rear end of a signal line 19 is connected to a corresponding electrode pad 18.
  • the rear ends of the ejecting electrodes 17, bonding wires and signal lines 19 are coated by an insulator resin.
  • the top cover plate 15 is made from an insulating resin by using an injection molding technique.
  • the ink inlet port 20 and the ink outlet port are connected to an ink reservoir with tubes (not shown) for circulation of the liquid ink which is effected by a pump.
  • Figs. 5A to 5H consecutively show the steps of fabricating the head substrate 16, shown in Fig. 4, mounting thereon ejecting electrodes 17.
  • a metal such as Cu or Ni is sputter-deposited on the entire flat surface of a sheet-shaped-substrate 16 to form a conductor layer 21 thereon, as shown in Fig. 5A.
  • a photoresist layer 22 is then formed on the conductor layer 21 by a spin-coating or laminating technique, as shown in Fig. 5B.
  • the photoresist layer 22 is then exposed to exposure light, as shown in Fig. 5C, through a mask 23 which defines a pattern of the ejecting electrodes 17, followed by development of the photoresist layer 22 to selectively remove the photoresist layer 22 to form a photoresist pattern on the conductor layer 21, as shown in Fig. 5D.
  • the resultant head substrate is immersed into an etching solution, which selectively etches the conductor layer 21, thereby leaving the ejecting electrodes 17 underlying the photoresist pattern 22, as shown in Fig. 5E. Thereafter, the resultant head substrate is immersed into another etching solution, which etches the photoresist pattern 22 selectively from the conductor pattern, to thereby obtain the ejecting electrodes 17 arranged on the head substrate 16 with a constant pitch, which is equivalent to the desired resolution of the printing, as shown in Fig. 5F.
  • a plurality of head substrates 16 maybe formed according to the fabrication steps mentioned above on a single wafer, followed by cutting the wafer into segments to provide a plurality of head substrates 16.
  • the head substrate 16 is subjected to a dicing step for forming the stripe protrusions 12 and channel regions 32 by using a dicing blade 24, as shown in Fig 5G.
  • the entire surface of the head substrate 16 is then coated by a coating resin 25, as shown in Fig 5H.
  • the depth of the channel regions 32 can be easily determined by the feed of the dicing blade 24 to a desired depth.
  • the stripe protrusions 12 and channel regions of the head substrate 16 may be formed by laser beam machining by using an excimer laser and a mask. In this case, the depth of the channel regions 32 can be easily determined by adjusting the length of time for laser radiation.
  • the stripe protrusions 12 of the head substrate 16 may be made of a photosensitive resin film patterned by a photolithographic technique using ultraviolet rays.
  • the depth of the channel regions 32 can be easily adjusted by the length of time for irradiation by the ultraviolet rays.
  • Fig. 6 shows a schematic illustration of the electrostatic ink jet recording head according to the present embodiment including the head body 10 of Fig. 3 and an associated opposing electrode 28.
  • the head body 10 is supported by a support member 37 so that the head body 10 is inclined at an angle of about 45° with respect to a horizontal plane to thereby direct the top corner of the front edge of the stripe protrusion 12 toward the opposing electrode 28.
  • the pointed tips of the ejecting electrodes 17 are directed toward the opposing electrode 28, which is maintained at a ground potential as shown in Fig. 6 or a negative potential.
  • the opposing electrode 28 serves as a platen for carrying a recording paper 29.
  • the support member 37 is slidably mounted on a horizontal shaft 38 extending parallel to the front edge of the head body 10.
  • the ejecting electrodes 17 are selectively applied with driving pulses to generate an electrostatic field for ejecting of ink droplets 30 from the ink meniscus 11, which is formed at the front end of the channel regions adjacent to the ejecting electrodes 17 applied with the driving pulses, toward the opposing electrode 28.
  • the recording paper 29 is fed along the opposing electrode 28 through the gap between the head body 10 and the opposing electrode 28 to receive the ejected ink droplets 30.
  • the ink droplets 30 are ejected at the corner edge of the stripe protrusion 12 defined by the front surface of the head substrate 16, top surface of the stripe protrusion 12 and the side surface of the stripe protrusion 12, i.e., side surface of the channel region 32.
  • the angle of 45° of the inclined head body 10 allows the ink meniscus 11 to be positioned due to gravity at the top corner of the front edge of the protrusion 12 on which the ejecting electrode 17 is disposed.
  • Fig. 7 shows a modification from the head body 10 of the electrostatic ink jet recording head of the first embodiment.
  • the head body 10A of the ink jet recording head of Fig. 7 is additionally provided with an electrophoretic electrode 33 at the inner rear wall of the top cover plate 15.
  • the electrophoretic electrode 33 is applied with a static voltage having the same polarity as that of the toner particles to move the toner particles in the ink chamber 14 toward the ink jet slit 36 of the head body 10A by an electrophoretic force.
  • Fig. 8 shows, similarly to Fig.
  • each ejecting electrode 17 in this embodiment is disposed on the bottom surface and both side surfaces of the channel region 32.
  • the ejecting electrode may be formed only on the side surfaces of the channel region 32.
  • the ejecting electrodes 17 are coated with an insulating resin for insulation.
  • Figs. 9A to 9E show consecutive steps in the fabrication of the head substrate 16 of the present embodiment.
  • An insulator plate 16A is first subjected to a mechanical dicing step using a dicing blade 24, as shown in Fig. 9A, to form a head substrate 16 having a plurality of stripe protrusions 12 and channel regions 32 arranged alternately at a constant pitch corresponding to a desired resolution of the printing, as shown in Fig. 9B.
  • the width of the channel region 32 is determined by the thickness of the dicing blade 24 and the depth of the channel region 32 is determined by the amount of the feed of the dicing blade 24.
  • the head substrate 16 may be formed by laser beam machining of an insulator plate 16A by using excimer laser or by photolithography of a photosensitive layer by using ultraviolet rays.
  • the depth of the channel region 32 is controlled by the time length of the irradiation by the laser beam or by the thickness of the photosensitive layer formed on the head substrate 16.
  • a metallic film 21 such as Cu, Ni etc. is formed on the entire surface of the head substrate 16 by sputter-deposition, for example, as shown in Fig. 9C.
  • the metallic film 21 on the top surface of the stripe protrusions 12 is then selectively etched away to leave the ejecting electrodes 17 remaining on the bottom surface and side surfaces of the channel regions 32 by using a photoresist pattern, as shown in Fig. 9D.
  • An overcoat 25 is then formed on the entire surface of the head substrate 16 and the ejecting electrodes 17 by a spin-coating technique for insulating the ejecting electrodes 17 from the liquid ink, as shown in Fig. 9E.
  • the ink jet recording head of the present embodiment operates in combination of the head body 10B and an associated opposing electrode, similarly to the case of the first embodiment as described with reference to Fig. 6.
  • Fig. 10 shows a top plan view of the ink jet recording head of the present embodiment in operation.
  • a driving pulse is selectively applied to desired ejecting electrodes 17 during a printing operation
  • electric lines 34 of force are generated between the ejecting electrode 17 applied with the driving pulse and the opposing electrode 28.
  • An ink meniscus 11 is formed in the channel region 32, having a concave front edge as viewed perpendicular to the head substrate 16 at the front end of the channel region 32.
  • the liquid ink is ejected as ink droplets 30 from a corner edge 35 of the stripe protrusion 12, at which the ink meniscus 11 has a maximum change in curvature, along the electric lines 34 of force, as shown in Fig. 10.
  • the corner edge 35 is defined by the side surface of the stripe protrusion 12, top surface of the stripe protrusion 12 and the front surface of the head substrate 14.
  • a modification similar to the modification 10A from the first embodiment may be made in which an electrophoretic electrode is provided at the rear edge of the ink chamber.

Landscapes

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

Claims (12)

  1. Tête d'enregistrement à jet d'encre électrostatique comprenant un corps de tête (10) définissant une chambre à encre (14) pour recevoir de l'encre liquide, ledit corps de tête (10) ayant un bord avant et un bord arrière, et une électrode opposée (28) qui est opposée audit bord avant, ladite tête d'enregistrement à jet d'encre éjectant l'encre liquide dudit corps de tête (10) vers ladite électrode opposée (28) pendant une opération d'enregistrement, dans laquelle ledit corps de tête (10) comporte un substrat isolant (16) ayant une pluralité de protubérances en forme de bandes (12) agencées au voisinage dudit bord avant, une électrode d'éjection (17) disposée de façon associée à ladite protubérance en forme de bande (12), dans laquelle ledit corps de tête (10A) comprend en outre une électrode électrophorétique (33) au voisinage d'un bord arrière de ladite chambre à encre.
  2. Tête d'enregistrement à jet d'encre électrostatique comprenant un corps de tête (10) définissant une chambre à encre (14) pour recevoir de l'encre liquide, ledit corps de tête (10) ayant un bord avant et un bord arrière, et une électrode opposée (28) qui est opposée audit bord avant, ladite tête d'enregistrement à jet d'encre éjectant l'encre liquide dudit corps de tête (10) vers ladite électrode opposée (28) pendant une opération d'enregistrement, dans laquelle ledit corps de tête (10) comporte un substrat isolant (16) ayant une pluralité de protubérances en forme de bandes (12) agencées au voisinage dudit bord avant, une électrode d'éjection (17) disposée de façon associée à ladite protubérance en forme de bande (12), comprenant en outre un élément de support (37) pour supporter ledit corps de tête (10) à un angle d'environ 45° par rapport à un plan horizontal.
  3. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 1 ou 2, dans laquelle lesdites protubérances en forme de bandes (12) s'étendent parallèlement les unes aux autres dudit bord avant vers ledit bord arrière.
  4. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 1, 2 ou 3, dans laquelle ledit corps de tête (10) comprend en outre une plaque de base (13) sur laquelle est monté ledit substrat isolant (16) dans une partie de bord avant de ladite plaque de base (13).
  5. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 1, 2, 3 ou 4, dans laquelle un espace situé entre deux desdites protubérances en forme de bandes (12) constitue une région de canal (32) pour le passage d'encre liquide.
  6. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 5, dans laquelle ladite région de canal (32) a une fonction capillaire et a une profondeur supérieure à une largeur de ladite région de canal.
  7. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 5 ou 6, dans laquelle ladite région de canal (32) a une surface formée par usinage.
  8. Tête d'enregistrement à jet d'encre électrostatique selon la revendication 5, 6 ou 7, dans laquelle chacune desdites électrodes d'éjection (17) est formée sur des surfaces latérales et une surface de fond de ladite région de canal (32).
  9. Tête d'enregistrement à jet d'encre électrostatique selon l'une quelconque des revendications 1 à 8, dans laquelle ladite électrode d'éjection (17) est recouverte d'un film isolant (25).
  10. Tête d'enregistrement à jet d'encre électrostatique selon l'une quelconque des revendications 1 à 9, dans laquelle ladite protubérance en forme de bande (12) est constituée d'un matériau photosensible.
  11. Tête d'enregistrement à jet d'encre électrostatique selon l'une quelconque des revendications 1 à 10, dans laquelle ladite électrode d'éjection (17) est disposée au-dessus de ladite protubérance en forme de bande (12).
  12. Tête d'enregistrement à jet d'encre électrostatique selon l'une quelconque des revendications 1 à 11, dans laquelle une plaque de recouvrement supérieure est superposée aux protubérances pour définir une fente d'éjection d'encre au voisinage du bord avant du corps de tête et la chambre à encre de façon adjacente à la fente d'éjection d'encre.
EP19970113252 1996-07-31 1997-07-31 Tête d'enregistrement à jet d'encre électrostatique Expired - Lifetime EP0822075B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP20176096 1996-07-31
JP202364/96 1996-07-31
JP20236496 1996-07-31
JP201760/96 1996-07-31
JP20236496A JP2826516B2 (ja) 1996-07-31 1996-07-31 静電式インクジェット記録ヘッド
JP20176096A JP2826513B2 (ja) 1996-07-31 1996-07-31 静電式インクジェット記録ヘッド

Publications (3)

Publication Number Publication Date
EP0822075A2 EP0822075A2 (fr) 1998-02-04
EP0822075A3 EP0822075A3 (fr) 1998-12-30
EP0822075B1 true EP0822075B1 (fr) 2001-11-07

Family

ID=26512967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970113252 Expired - Lifetime EP0822075B1 (fr) 1996-07-31 1997-07-31 Tête d'enregistrement à jet d'encre électrostatique

Country Status (2)

Country Link
EP (1) EP0822075B1 (fr)
DE (1) DE69707988T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1095772A1 (fr) * 1999-10-25 2001-05-02 Tonejet Corporation Pty Ltd Tête d'impression
JP2004322488A (ja) * 2003-04-25 2004-11-18 Fuji Photo Film Co Ltd 液体吐出ヘッドの作製方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869068A (ja) * 1981-10-20 1983-04-25 Ricoh Co Ltd インクジエツト記録装置
JP2845812B2 (ja) * 1996-06-17 1999-01-13 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

Also Published As

Publication number Publication date
EP0822075A3 (fr) 1998-12-30
DE69707988T2 (de) 2002-04-04
EP0822075A2 (fr) 1998-02-04
DE69707988D1 (de) 2001-12-13

Similar Documents

Publication Publication Date Title
US6092889A (en) Ink-jet head and ink-jet recording device each having a protruded-type electrode
AU720874B2 (en) Electrostatic ink-jet recording apparatus using ink containing charge particulate material
EP0822075B1 (fr) Tête d'enregistrement à jet d'encre électrostatique
EP0813969B1 (fr) Méthode de fabrication d'une tête d'enregistrement pour un dispositif d'enregistrement à jet d'encre
EP0822074B1 (fr) Tête d'enregistrement à jet d'encre électrostatique
EP0869004B1 (fr) Tête d'enregistrement électrostatique
EP0844088A2 (fr) Tête d'impression à jet d'encre électrostatique et son procédé de fabrication
JP2845812B2 (ja) 静電式インクジェット記録ヘッド
JP2845852B2 (ja) 静電式インクジェット記録ヘッド
JP2826530B2 (ja) 静電式インクジェット記録ヘッド
JP2885742B2 (ja) 静電式インクジェット記録ヘッド
JP2826516B2 (ja) 静電式インクジェット記録ヘッド
US6213591B1 (en) Injet recording apparatus
JP2786162B2 (ja) 静電式インクジェット記録装置
JP2885745B2 (ja) 静電式インクジェット記録ヘッド
JP2826513B2 (ja) 静電式インクジェット記録ヘッド
JP2826529B2 (ja) 静電式インクジェット記録ヘッド
JP2783207B2 (ja) 静電式インクジェット記録ヘッド及びその製造方法
JP2885748B2 (ja) 静電式インクジェット記録ヘッド
JP2783213B2 (ja) 静電式インクジェット記録ヘッド
JP3721572B2 (ja) インクジェット記録装置
JP2834102B2 (ja) 静電式インクジェット記録ヘッド
JP2957518B2 (ja) 静電式インクジェット記録ヘッド
JPH1044427A (ja) 静電式インクジェット記録ヘッド
JPH11157079A (ja) インクジェット記録装置

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

AX Request for extension of the european patent

Free format text: AL;LT;LV;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;RO;SI

17P Request for examination filed

Effective date: 19981118

AKX Designation fees paid

Free format text: DE FR GB

17Q First examination report despatched

Effective date: 19991019

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

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: 69707988

Country of ref document: DE

Date of ref document: 20011213

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: FR

Payment date: 20060719

Year of fee payment: 10

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

Ref country code: GB

Payment date: 20060726

Year of fee payment: 10

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

Ref country code: DE

Payment date: 20060727

Year of fee payment: 10

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

Effective date: 20070731

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: 20080201

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: 20070731

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20080331

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: 20070731