EP0812696A1 - Structure de tête d'impression avec une électrode d'écran spécifique - Google Patents

Structure de tête d'impression avec une électrode d'écran spécifique Download PDF

Info

Publication number
EP0812696A1
EP0812696A1 EP97201633A EP97201633A EP0812696A1 EP 0812696 A1 EP0812696 A1 EP 0812696A1 EP 97201633 A EP97201633 A EP 97201633A EP 97201633 A EP97201633 A EP 97201633A EP 0812696 A1 EP0812696 A1 EP 0812696A1
Authority
EP
European Patent Office
Prior art keywords
printhead structure
printing
dimension
shield electrode
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.)
Granted
Application number
EP97201633A
Other languages
German (de)
English (en)
Other versions
EP0812696B1 (fr
Inventor
Guido Desie
Jacques Leonard
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.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
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 Agfa Gevaert NV filed Critical Agfa Gevaert NV
Priority to EP19970201633 priority Critical patent/EP0812696B1/fr
Publication of EP0812696A1 publication Critical patent/EP0812696A1/fr
Application granted granted Critical
Publication of EP0812696B1 publication Critical patent/EP0812696B1/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
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing
    • B41J2/415—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit
    • B41J2/4155—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit for direct electrostatic printing [DEP]

Definitions

  • This invention relates to an apparatus for use in the process of electrostatic printing and more particularly to a printhead structure for use in Direct Electrostatic Printing (DEP).
  • DEP Direct Electrostatic Printing
  • electrostatic printing is performed directly from a toner delivery means on a receiving member substrate by means of an electronically addressable printhead structure.
  • the toner or developing material is deposited directly in an imagewise way on a receiving substrate, the latter not bearing any imagewise latent electrostatic image.
  • the substrate is an intermediate endless flexible belt (e.g. aluminium, polyimide etc.)
  • the imagewise deposited toner must be transferred onto another final substrate. If, however, the toner is deposited directly on the final receiving substrate, a possibility is fulfilled to create directly the image on the final receiving substrate, e.g. plain paper, transparency, etc. This deposition step is followed by a final fusing step.
  • the method makes the method different from classical electrography, in which a latent electrostatic image on a charge retentive surface is developed by a suitable material to make the latent image visible. Further on, either the powder image is fused directly to said charge retentive surface, which then results in a direct electrographic print, or the powder image is subsequently transferred to the final substrate and then fused to that medium. The latter process results in an indirect electrographic print.
  • the final substrate may be a transparent medium, opaque polymeric film, paper, etc.
  • DEP is also markedly different from electrophotography in which an additional step and additional member is introduced to create the latent electrostatic image. More specifically, a photoconductor is used and a charging/exposure cycle is necessary.
  • a DEP device is disclosed in e.g. US 3,689,935.
  • This document discloses an electrostatic line printer having a multi-layered particle modulator or printhead structure comprising :
  • Selected potentials are applied to each of the control electrodes while a fixed potential is applied to the shield electrode.
  • An overall applied propulsion field between a toner delivery means and a receiving member support projects charged toner particles through a row of apertures of the printhead structure.
  • the intensity of the particle stream is modulated according to the pattern of potentials applied to the control electrodes.
  • the modulated stream of charged particles impinges upon a receiving member substrate, interposed in the modulated particle stream.
  • the receiving member substrate is transported in a direction orthogonal to the printhead structure, to provide a line-by-line scan printing.
  • the shield electrode may face the toner delivery means and the control electrode may face the receiving member substrate.
  • a DC field is applied between the printhead structure and a single back electrode on the receiving member support.
  • This propulsion field is responsible for the attraction of toner to the receiving member substrate that is placed between the printhead structure and the back electrode.
  • the printhead structure as described in US 3,689,935 is thus characterised by the presence of two electrode layers and is called further on a P2-printhead structure.
  • the voltages used for image-wise deposition of toner particles is of the order of about 400 V.
  • Such devices have e.g. been described in US 4,755,837.
  • a DEP device is well suited to print half-tone images.
  • the densities variations present in a half-tone image can be obtained by modulation of the voltage applied to the individual control electrodes.
  • Providing printing apertures in a DEP printhead structure comprising two electrodes (control electrode and shield electrode) separated by an insulating plastic material, to yield a printhead capable of producing images with high resolution and also with uniform density pattern is not an obvious process.
  • All printing apertures in the printhead structure must have exactly the predetermined diameter, the electrodes must stay in place and have a well defined and constant shape, and the walls of the printing apertures through the insulating plastic must be smooth to avoid clogging of the printing apertures.
  • each aperture must be individually addressable such as to be able to yield any density between zero and maximum density.
  • every printing aperture has to be addressable to the same extent in order to yield smooth density pattern. Applying a controlling voltage of a few hundreds of volt between an individual control electrode and the global shield electrode may not short-circuit the nozzle and render it useless.
  • a printhead structure of polyimide with 3 electrode layers is described.
  • a first sheet of polyimide has a printing aperture with on one side a common shield electrode, and on the other side individual control electrodes.
  • a second sheet of polyimide is laminated upon said first sheet of flexprint material and has printing apertures with the same aperture diameter and registered with a high degree of accuracy with said first sheet with printing apertures.
  • screening electrodes are available, said screening electrodes having a diameter that is larger than the diameter of said apertures.
  • a printhead structure consisting of two sheets of polyimide foil laminated to each other. Both sheets have printing apertures with the same aperture diameter, and both of said printing apertures have to be registered to a high degree of accuracy.
  • a common shield electrode is provided at a first side of said first flexprint material facing away from said lamination side.
  • Said second sheet of flexprint material has individual control electrode at the other side of said laminated printhead structure, also facing away from said lamination side.
  • Said control electrodes in said second sheet of flexprint material have conductive patterns inside said printhead structures as depicted in figure 23 said US 5,170,185.
  • a printhead structure is made from a single sheet of flexprint material but the shape of said printing apertures is made concave in one embodiment of this invention.
  • the aperture diameter is larger at the side of the common shield electrode than at the side of the individual control electrodes.
  • the printing aperture is made in said plastic material in such a way that a concave form is obtained.
  • a single sheet of flexprint material is used.
  • the printing aperture has a fixed diameter and the individual control electrodes are through-hole-connected to the shield electrode side. Said shield electrode itself has a much larger diameter so that it remains electrically insulated from said control electrode.
  • This printhead structure is also illustrated in figure 2 of said US 5,038,159.
  • a DEP system using a printhead structure comprising two electrodes (control electrode and shield electrode) separated by an insulating plastic material and wherein printing apertures are present, wherein the printing apertures are not easily clogged by the toner particles and wherein each aperture is individually addressable in a reproducible way by low control voltages, and wherein an image with enhanced grey scale resolution can be obtained, and wherein said printhead structure can be fabricated in an easy and straightforward way.
  • DEP Direct Electrostatic Printing
  • a printhead structure comprising, an insulating material (106c) having a first and a second side, said first side carrying control electrodes (106a) associated with printing apertures, said second side carrying a shield electrode (106b), wherein
  • A B and E/D ⁇ 1.10.
  • control electrode or “control electrodes” is used to indicate the electrodes that are used to control the flow,of particles through the printing apertures and that are associated with one or more printing apertures, but a control electrode is never a common electrode for all printing apertures.
  • control electrodes are located on a first side (face) of an insulating material and are isolated from each other, so that different “control electrodes” can have a different voltage.
  • shield electrode is used to indicate a continuous electrode located on a second side (face) of said insulating material, opposite to the side (face) carrying the control electrodes. On the shield electrode a single voltage is present and the shield electrode is a common electrode for all printing apertures.
  • the voltage level needed to block completely the toner flux, in order to get image parts with no density, is rather high.
  • said high control voltages can short-circuit the shield electrode and the individual control electrodes, through the printing aperture surrounded by both apertures. This short-circuiting deteriorates the printhead structure and/or driving IC's leading to malfunction of the printing device.
  • the printhead structures according to US 3,689,935 but with only a single plane of control electrodes (P1-printhead structures) were found to provide a much higher image contrast if compared with said P2-printhead structures, i.e. can only print a small tone scale. It was found that short-circuiting and image degradation was less important for these printhead structures.
  • control voltage needed to block the toner flux from toner applicator device to final image receiving member was much lower than the control voltage needed for a printhead structure according to a P2-structure.
  • said P1-printhead structures are less suitable.
  • Printhead structure of the P1 type i.e. not comprising a shield electrode, showing segmented control electrodes have been disclosed in, e.g. US 5,515,084, JP-A 61/110567 and EP-A 720 072.
  • These modifications of a P1 type printhead structure do not overcome the drawbacks of such a type of printhead structure and are still less well suited for printing images with enhanced density resolution (e.i. a large number of density levels between maximum density and minimum density or having a large tonal range or tone scale)
  • a printhead structure of the P2 type wherein, either the shield electrode or the control electrodes or both do not reach as far as the edge of the printing apertures. Therefore a printhead structure is manufactured comprising, an insulating material (106c) having a first and a second side, said first side carrying control electrodes (106a) associated with printing apertures, said second side carrying a shield electrode (106b), wherein
  • a printhead structure has been illustrated in fig 2a.
  • 106b is the shield electrode
  • 106c represents the insulating material
  • 107 represent a printing aperture.
  • A represents the longest dimension of the printing apertures measured on said side of said insulating material carrying said shield electrode
  • B represents the dimension of the opening in the shield electrode measured in the direction of said longest dimension (A).
  • FIG. 3a A cross section through such a printhead structure, along the plane X,X' and X'' (figure 2a), is shown in figure 3a.
  • the printing aperture (107) has a longest dimension A and the shield electrode (106b) has an opening with dimension B measured in the same direction as dimension A. Dimension B is larger than dimension A so that B/A ⁇ 1.10.
  • a printhead structure, wherein more than one printing aperture is present in the opening in the shield electrode are also within the scope of this first embodiment of a printhead structure according to the present invention.
  • a printhead structure wherein the shield electrode 106b is only a thin track of conducting material surrounding all arrays of printing apertures (107), as illustrated in fig 2b, is also within the scope of this first embodiment of the present invention.
  • the "longest dimension" of a printing aperture has to be understood as the diameter of the circle defining said printing aperture in the case of circular printing apertures, as the side of the square defining said printing aperture in the case of square printing apertures, as the longest side of the rectangle defining said printing apertures in the case of rectangular printing apertures, as the longest axis of the ellipse defining said printing aperture in the case of elliptic printing apertures.
  • the longest dimension is to be understood as the diameter of the smallest circumscribed circle.
  • the printing aperture (107) has a longest dimension D, measured on said side of said insulating material carrying said control electrodes and a longest dimension A, measured on said side of said insulating material carrying said shield electrode, the shield electrode (106b) has an opening with dimension B measured in the same direction as dimension A.
  • a control electrode (106a) is present around printing aperture 107.
  • the control electrode has an opening with dimension E measured in the same direction as dimension D.
  • Dimension B is equal to dimension A (i.e. the shield electrode extends as far as the edges of the printing aperture) and the dimension E > D, such that E/D ⁇ 1.10.
  • each of the printing apertures preferably, 1.25 ⁇ E/D ⁇ 15, and more preferably 2 ⁇ E/D ⁇ 10.
  • a printhead structure wherein more than one printing aperture is associated with a single control electrode is within the scope of this embodiment of the present invention, as long as for each of the printing apertures associated with said single control electrode the relations between D and E, detailed above, are fulfilled.
  • a printhead structure is provide wherein both the control electrodes and the shield electrode do not reach as far as the edges of the printing apertures.
  • Such a printhead structure is illustrated in fig 3c.
  • the printing aperture (107) has a longest dimension D, measured on said side of said insulating material carrying said control electrodes and a longest dimension A, measured on said side of said insulating material carrying said shield electrode, the shield electrode (106b) has an opening with dimension B measured in the same direction as dimension A.
  • a control electrode (106a) is present around printing aperture 107.
  • the control electrode has an opening with dimension E measured in the same direction as dimension D.
  • Dimension B is larger than dimension A (i.e.
  • the shield electrode does not extend as far as the edges of the printing aperture), and B/A ⁇ 1.10 and the dimension E > D, (i.e. the control electrode does not extend as far as the edges of the printing aperture), such that E/D ⁇ 1.10.
  • E/D ⁇ 1.10 1.5 ⁇ B/A ⁇ 15 and 1.25 ⁇ E/D ⁇ 15; in a more preferred embodiment 2 ⁇ B/A ⁇ 10 and 2 ⁇ E/D ⁇ 10.
  • the insulating material contained in a printhead structure according to the present invention can be any insulating material known in the art, e.g. ceramic materials, glass, plastic, etc. It is preferred to use plastic materials as insulating material in a printhead structure of the present invention or thin glass (thickness lower than 400 ⁇ m) having a failure stress (under tensile stress) equal to or higher than 1 x 10 7 Pa and an elasticity modulus (Young's modulus) equal to or lower than 10 x 10 10 Pa.
  • the thickness of the insulating material is preferably between 10 and 200 ⁇ m, more preferably between 50 and 100 ⁇ m.
  • the printing apertures of a printhead structure according to the present invention can have any form, they can be circular, elliptic, square, rectangular, etc.
  • the printing apertures in a printhead structure according to the present invention can be of the type wherein each individual control electrode surrounds at least two apertures (107), both with an aspect ratio AR > 1 and part of said control electrode separates said apertures (107).
  • Such printhead structure have been disclosed in EP-A 754 557
  • Printhead structures according to the present invention can be made in an easy and convenient as known to those skilled in the art. It is e.g. possible to start from conventional polyimide foil with double side clad copper surfaces. First of all the control electrodes with printing apertures and conductive patterns are etched on one side of said flexprint material. Second the pattern of the common shield electrode is etched at the other side of said flexprint material. Both sides are registered so that the centre of each printing aperture is well aligned for both shield electrode side and control electrode side.
  • the apertures can be made by different techniques such as e.g. excimer laser burning from the control electrode side making use of the copper control electrode as mask for the laser light. Additional cleaning such as plasma etching can be applied in order to obtain a better quality regarding aperture definition and insulating power. Additional thin protective dielectric coatings can be applied over said conductive patterns and/or insulating material.
  • the insulation quality is improved by applying typical thin dielectric coatings above said patterned structure.
  • a DEP device comprising a printhead structure according to this invention, comprises essentially
  • FIG 4 a non limitative example of a device for implementing a DEP device incorporating a printhead structure according to the present invention, is shown.
  • the DEP device shown in figure 4 comprises :
  • Voltage V4 is applied to the back electrode behind the toner receiving member, the potential difference V4-V1 create a propulsion field wherein toner particles flow from the toner delivery means to the image receptive member.
  • multiple voltages V2 0 to V2 n and/or V4 0 to V4 n can be used.
  • said toner delivery means 101 creates a layer of multi-component developer on a magnetic brush assembly 103, and the toner cloud 104 is directly extracted from said magnetic brush assembly 103.
  • the toner is first applied to a conveyer belt and transported on this belt in the vicinity of the printing apertures.
  • a device according to the present invention is also operative with a mono-component developer or toner, which is transported in the vicinity of the printing apertures (107), via a conveyer for charged toner.
  • a conveyer can be a moving belt or a fixed belt. The latter comprises an electrode structure generating a corresponding electrostatic travelling wave pattern for moving the toner particles.
  • the magnetic brush assembly (103) preferentially used in a DEP device according to an embodiment of the present invention can be either of the type with stationary core and rotating sleeve or of the type with rotating core and rotating or stationary sleeve.
  • carrier particles such as described in EP-A 675 417 can be used in a preferred embodiment of the present invention.
  • any toner particles, black, coloured or colourless, can be used in a DEP device comprising a printhead structure according to the present invention. It is preferred to use toner particles as disclosed in EP-A 715 218, that is incorporated by reference, in combination with a printhead structure according to the present invention.
  • a DEP device making use of the above mentioned marking toner particles can be addressed in a way that enables it to give black and white. It can thus be operated in a "binary way", useful for black and white text and graphics and useful for classical bilevel halftoning to render continuous tone images.
  • a DEP device is especially suited for rendering an image with a plurality of grey levels.
  • Grey level printing can be controlled by either an amplitude modulation of the voltage V3 applied on the control electrode 106a or by a time modulation of V3. By changing the duty cycle of the time modulation at a specific frequency, it is possible to print accurately fine differences in grey levels. It is also possible to control the grey level printing by a combination of an amplitude modulation and a time modulation of the voltage V3, applied on the control electrode.
  • a printhead structure was made from a polyimide film of 50 ⁇ m thickness (insulating material 106c), double sided coated with a 17.5 ⁇ m thick copper film.
  • the printhead structure had two rows of printing apertures.
  • the printing apertures had a longest dimension, measured at the side of the control electrodes, D of 200 ⁇ m.
  • the total width of the square shaped copper control electrodes was 300 micron, the longest dimension of their opening E was also 200 micron.
  • the dimension of the opening in the common shield electrode, measured in the direction of the longest dimension of the printing apertures present in said opening of said shield electrode, B, was 300 ⁇ m.
  • the ratio B/A was thus 1.50 and the ratio E/D was 1.00.
  • Said printhead structure was fabricated in the following way. First of all the control electrode pattern was etched by conventional copper etching techniques. Then the shield electrode pattern was etched by conventional copper etching techniques.
  • the apertures were made by a step and repeat focused excimer laser making use of the control electrode patterns as focusing aid. After excimer burning the printhead structure was cleaned by a short isotropic plasma etching cleaning. Finally a thin coating of PLASTIK70 (trade name), commercially available from Griffin Chemie, CRC Industries NV, Belgium was applied over both surfaces of said printhead structure.
  • PLASTIK70 trade name
  • the toner delivery means (101) was a stationary core/rotating sleeve type magnetic brush comprising two mixing rods and one metering roller. One rod was used to transport the developer through the unit, the other one to mix toner with developer.
  • the magnetic brush assembly (103) was constituted of the so called magnetic roller, which in this case contained inside the roller assembly a stationary magnetic core, showing nine magnetic poles of 500 Gauss (0.05 T) magnetic field intensity and with an open position to enable used developer to fall off from the magnetic roller.
  • the magnetic roller contained also a sleeve, fitting around said stationary magnetic core, and giving to the magnetic brush assembly an overall diameter of 20 mm.
  • the sleeve was made of stainless steel roughened with a fine grain to assist in transport (Ra ⁇ 50 ⁇ m). A scraper blade was used to force developer to leave the magnetic roller. And on the other side a doctoring blade was used to meter a small amount of developer onto the surface of said magnetic brush assembly.
  • the sleeve was rotating at 100 rpm, the internal elements rotating at such a speed as to conform to a good internal transport within the development unit.
  • the magnetic brush assembly (103) was connected to an AC power supply with a square wave oscillating field of 600 V at a frequency of 3.0 kHz with 0 V DC-offset.
  • a macroscopic "soft" ferrite carrier consisting of a MgZn-ferrite with average particle size 50 ⁇ m a magnetisation at saturation of 29 emu/g (36.5 ⁇ T.m 3 /kg) was provided with a 1 ⁇ m thick acrylic coating. The material showed virtually no remanence.
  • the toner used for the experiment had the following composition : 97 parts of a co-polyester resin of fumaric acid and propoxylated bisphenol A, having an acid value of 18 and volume resistivity of 5.1 x 10 16 ohm.cm was melt-blended for 30 minutes at 110° C in a laboratory kneader with 3 parts of Cu-phthalocyanine pigment (Colour Index PB 15:3).
  • a resistivity decreasing substance - having the following structural formula : (CH 3 ) 3 N + C 16 H 33 Br - was added in a quantity of 0.5 % with respect to the binder. It was found that - by mixing with 5 % of said ammonium salt - the volume resistivity of the applied binder resin was lowered to 5x10 14 ⁇ .cm. This proves a high resistivity decreasing capacity (reduction factor : 100).
  • the solidified mass was pulverized and milled using an ALPINE Fliessbettarnastrahlmühle type 100AFG (tradename) and further classified using an ALPINE multiplex zig-zag classifier type 100MZR (tradename).
  • the resulting particle size distribution of the separated toner measured by Coulter Counter model Multisizer (tradename), was found to be 6.3 ⁇ m average by number and 8.2 ⁇ m average by volume.
  • the toner particles were mixed with 0.5 % of hydrophobic colloidal silica particles (BET-value 130 m 2 /g).
  • An electrostatographic developer was prepared by mixing said mixture of toner particles and colloidal silica in a 4 % ratio (w/w) with carrier particles.
  • the tribo-electric charging of the toner-carrier mixture was performed by mixing said mixture in a standard tumbling set-up for 10 min.
  • the shield electrode (106b) was grounded : V2 0 V.
  • To the individual control electrodes an (imagewise) voltage V3 between 0 V and -300 V was applied.
  • the back electrode (105) was connected to a high voltage power supply of +500 V.
  • To the sleeve of the magnetic brush an AC voltage of 600 V at 3.0 kHz was applied, without DC offset.
  • a printhead structure was fabricated in the same way as described for example 1, except that the longest dimension of the printing apertures, measured at the side of the shield electrode, (A), the longest dimension of the printing apertures, measured at the side of the control electrodes, (D), the dimension of the opening in shield electrode, measured in the direction of the longest dimension of the printing apertures (B) and the dimension of the opening in the control electrode, measured in the direction of the longest dimension of the printing apertures (E) were modified. The modifications are summarized in table 1.
  • Grey scale images with 16 time-modulated levels were printed with all printhead structures as tabulated in table 1.
  • the extent of the tone scale that could be printed with a printhead structure of the P1 type, comparative example 2 (CE2) was measured as the average slope of the curve D versus time-modulated grey level value in the D range 0.2 Dmax to 0.8 Dmax.
  • This extent of printed tone scale was set to be 1.00, and the extent tone scale that could be printed with the other printhead structure of the examples and comparative example were related to said extent of tone scale.
  • a larger figure means that a larger tone scale could be printed.
  • the reliability of the printhead structure was determined as the number of defect printing apertures (probably due to short-circuiting of shield and control electrode) after applying a control electrode voltage of 500 V between said control electrodes and shield electrode (or earth) for one hour.
  • the number of defects in a P2 type printhead (comparative example 1, (CE1)), was set to 1.00, the defects of the other printhead structures were related to the number of defects of the printhead structure of the P2 type, so that a lower figure is better. These values are also tabulated in table 1 under the heading 'def'.

Landscapes

  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP19970201633 1996-06-11 1997-06-03 Structure de tête d'impression avec une électrode d'écran spécifique Expired - Lifetime EP0812696B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970201633 EP0812696B1 (fr) 1996-06-11 1997-06-03 Structure de tête d'impression avec une électrode d'écran spécifique

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96201622 1996-06-11
EP96201622 1996-06-11
EP19970201633 EP0812696B1 (fr) 1996-06-11 1997-06-03 Structure de tête d'impression avec une électrode d'écran spécifique

Publications (2)

Publication Number Publication Date
EP0812696A1 true EP0812696A1 (fr) 1997-12-17
EP0812696B1 EP0812696B1 (fr) 1998-05-06

Family

ID=26142881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970201633 Expired - Lifetime EP0812696B1 (fr) 1996-06-11 1997-06-03 Structure de tête d'impression avec une électrode d'écran spécifique

Country Status (1)

Country Link
EP (1) EP0812696B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0952498A1 (fr) * 1998-04-22 1999-10-27 Agfa-Gevaert N.V. Procédé d'impression électrostatique directe pour la formation d'un motif résistant sur un substrat conducteur et utilisation dans la fabrication de circuits imprimés
WO2002024461A1 (fr) * 2000-09-20 2002-03-28 Array Ab Structure de tete d'imprimerie et dispositif d'enregistrement d'images comprenant cette structure
US9784027B2 (en) 2013-12-31 2017-10-10 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with metallic peripheral edge seal and/or methods of making the same
US10012019B2 (en) 2013-12-31 2018-07-03 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with metallic peripheral edge seal and/or methods of making the same
US10145005B2 (en) 2015-08-19 2018-12-04 Guardian Glass, LLC Techniques for low temperature direct graphene growth on glass
US10280680B2 (en) 2013-12-31 2019-05-07 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with pump-out port sealed using metal solder seal, and/or method of making the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61110567A (ja) * 1984-11-06 1986-05-28 Nippon Telegr & Teleph Corp <Ntt> イオン流制御電極
EP0435549A2 (fr) * 1989-12-18 1991-07-03 Xerox Corporation Tête d'impression à orifices pour imprimante électrostatique directe
US5214451A (en) * 1991-12-23 1993-05-25 Xerox Corporation Toner supply leveling in multiplexed DEP
WO1994026527A1 (fr) * 1993-05-18 1994-11-24 Array Printers Ab Procede d'impression sans impact utilisant une matrice multiplexee d'electrodes unitaires commandees et dispositif d'execution du procede
EP0720072A2 (fr) * 1994-12-27 1996-07-03 Sharp Kabushiki Kaisha Appareil de formation d'images

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61110567A (ja) * 1984-11-06 1986-05-28 Nippon Telegr & Teleph Corp <Ntt> イオン流制御電極
EP0435549A2 (fr) * 1989-12-18 1991-07-03 Xerox Corporation Tête d'impression à orifices pour imprimante électrostatique directe
US5214451A (en) * 1991-12-23 1993-05-25 Xerox Corporation Toner supply leveling in multiplexed DEP
WO1994026527A1 (fr) * 1993-05-18 1994-11-24 Array Printers Ab Procede d'impression sans impact utilisant une matrice multiplexee d'electrodes unitaires commandees et dispositif d'execution du procede
EP0720072A2 (fr) * 1994-12-27 1996-07-03 Sharp Kabushiki Kaisha Appareil de formation d'images

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 295 (M - 523) 7 October 1986 (1986-10-07) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0952498A1 (fr) * 1998-04-22 1999-10-27 Agfa-Gevaert N.V. Procédé d'impression électrostatique directe pour la formation d'un motif résistant sur un substrat conducteur et utilisation dans la fabrication de circuits imprimés
WO2002024461A1 (fr) * 2000-09-20 2002-03-28 Array Ab Structure de tete d'imprimerie et dispositif d'enregistrement d'images comprenant cette structure
US9784027B2 (en) 2013-12-31 2017-10-10 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with metallic peripheral edge seal and/or methods of making the same
US10012019B2 (en) 2013-12-31 2018-07-03 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with metallic peripheral edge seal and/or methods of making the same
US10280680B2 (en) 2013-12-31 2019-05-07 Guardian Glass, LLC Vacuum insulating glass (VIG) unit with pump-out port sealed using metal solder seal, and/or method of making the same
US10683695B2 (en) 2013-12-31 2020-06-16 Guardian Glass, Llc. Vacuum insulating glass (VIG) unit with metallic peripheral edge seal and/or methods of making the same
US10145005B2 (en) 2015-08-19 2018-12-04 Guardian Glass, LLC Techniques for low temperature direct graphene growth on glass

Also Published As

Publication number Publication date
EP0812696B1 (fr) 1998-05-06

Similar Documents

Publication Publication Date Title
US5708464A (en) Device for direct electrostatic printing (DEP) with &#34;previous correction&#34;
EP0754557B1 (fr) Structure de tête d&#39;impression pour son utilisation dans une imprimante électrostatique direct (DEP)
EP0812696B1 (fr) Structure de tête d&#39;impression avec une électrode d&#39;écran spécifique
EP0710898B1 (fr) Dispositif d&#39;impression électrostatique directe avec rangées d&#39;ouvertures de dimensions plus petites et plus grandes
EP0780740B1 (fr) Dispositif d&#39;impression électrostatique directe avec une structure d&#39;une tête d&#39;impression avec ouvertures à fente
EP0710897B1 (fr) Dispositif d&#39;impression électrostatique direct avec électrode individuelle d&#39;écran et de commande par ouverture
US6059398A (en) Printhead structure having electrodes not extending to the edge of printing apertures
EP0736822B1 (fr) Dispositif d&#39;impression électrostatique directe
EP0740224B1 (fr) Imprimante électrostatographique directe (DEP)
EP0753413B1 (fr) Structure de tête d&#39;impression pour l&#39;utilisation dans un dispositif DEP
US5738009A (en) Method for direct electrostatic printing (DEP)
US5889540A (en) Direct electrostatic printing device (Dep) and printhead structure with low current flow between shield and control electrodes
JP3159940B2 (ja) 特別なシールド電極を有するプリントヘッド構造体
EP0763785B1 (fr) Dispositif d&#39;impression électrostatique directe (DEP) utilisant un courant de gaz pour obtenir un nuage de rélévateur
EP0731394B1 (fr) Dispositif pour l&#39;impression électrostatique directe comprenant une structure à brosse magnétique et à tête d&#39;impression à géométrie particulière
US6102523A (en) Printer for large format printing using a direct electrostatic printing (DEP) engine
EP0719648B1 (fr) Appareil d&#39;impression électrostatique directe comprenant une structure de tête d&#39;impression avec un flux de courant inférieur ou égal à 50 microA entre les électrodes de commande et d&#39;écran
US6246424B1 (en) Device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer
EP0849645A1 (fr) Appareil d&#39;impression pour imprimer à grand format utilsant un appareil d&#39;impression électrostatique direct
EP0795792A1 (fr) Pré-processeur d&#39;image dans un dispositif d&#39;impression électrostatique directe
US6109729A (en) Direct electrostatic printing device having a printhead structure with control electrodes on one side of a slit aperture
EP0984336A1 (fr) Appareil d&#39;impression pour imprimer à grand format avec une seule unité centrale de contrôle et de surveillance de toner
EP0811894A1 (fr) Méthode d&#39;impression d&#39;information sur des substrats munis d&#39;éléments de sécurité
EP1003083B1 (fr) Appareil d&#39;impression pour imprimer à grand format, comportant une unité centrale de conditionnement pour commander et surveiller la condition du révélateur
EP0809158A2 (fr) Dispositif d&#39;impression électrostatique directe utilisant une composition de toner ayant une bonne conductivité

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

17P Request for examination filed

Effective date: 19970730

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR GB

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): BE DE FR GB

REF Corresponds to:

Ref document number: 69700008

Country of ref document: DE

Date of ref document: 19980610

ET Fr: translation filed
AKX Designation fees paid

Free format text: DE FR GB IT

RBV Designated contracting states (corrected)

Designated state(s): BE DE FR GB

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: 746

Effective date: 20000317

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

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

Ref country code: BE

Payment date: 20010425

Year of fee payment: 5

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

Ref country code: DE

Payment date: 20010515

Year of fee payment: 5

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

Ref country code: GB

Payment date: 20010516

Year of fee payment: 5

Ref country code: FR

Payment date: 20010516

Year of fee payment: 5

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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: 20020603

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

Ref country code: BE

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

Effective date: 20020630

BERE Be: lapsed

Owner name: *AGFA-GEVAERT N.V.

Effective date: 20020630

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: 20030101

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

Effective date: 20020603

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: 20030228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST