EP1234670A2 - Tête d'impression et imprimante à électrodes de déflexion améliorées - Google Patents
Tête d'impression et imprimante à électrodes de déflexion améliorées Download PDFInfo
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- EP1234670A2 EP1234670A2 EP02290450A EP02290450A EP1234670A2 EP 1234670 A2 EP1234670 A2 EP 1234670A2 EP 02290450 A EP02290450 A EP 02290450A EP 02290450 A EP02290450 A EP 02290450A EP 1234670 A2 EP1234670 A2 EP 1234670A2
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- European Patent Office
- Prior art keywords
- drops
- electrode
- electrodes
- jet
- ink
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
Definitions
- the present invention is in the field printer printheads. It concerns more particularly an improvement in electrodes of electrostatic deflection of ink drops electrically charged. It also concerns a inkjet printer equipped with this head improved.
- Inkjet printers are classified in two major technological families, a first formed by "drop on demand” printers and a second consisting of jet printers continued:
- “Drop on demand” printers are mainly office printers, intended for print text and graphic patterns, in black or in colour.
- Drop-on-demand printers generate directly and only the ink drops actually necessary to print the patterns desired.
- the print head of these printers has a plurality of ink ejection nozzles, usually aligned along an axis of alignment of nozzles and each addressing a single point of the support printing.
- the ejection nozzles are in sufficient number, the impression is obtained by the simple moving the print media under the head, perpendicular to the nozzle alignment axis. Otherwise, an additional scan of the media relative to the print head is essential.
- Continuous inkjet printers are generally used for applications industrial marking and coding.
- printers deflected continuous jet
- the amount of charge transferred to the drops of the jet is variable and each drop records a deflection proportional to the load previously assigned to it.
- the point of the print medium reached by a drop is a function of this electrical charge.
- the undeflected drops are recovered by a gutter and recycled to an ink circuit.
- a second variant of continuous jet printers deviated so-called binary continuous jet stands out mainly from the previous one by the fact that only one level of deflection of the drops is created.
- the impression of characters or patterns therefore requires the use of multi-nozzle print heads.
- the distance between the nozzles coincides with that of the impacts on the support printing. It should be noted that in general the drops intended for printing are the drops not deflected.
- Binary continuous jet printers are for high-end printing applications speed such as addressing or personalization of documents.
- the first so-called deflection technique equipotential is the oldest. It consists of use two metal electrodes with surfaces facing each other - called active surfaces -. The train of drops crosses the space between the active surfaces. Each of the active surfaces, in look of the jet, is brought to an electric potential constant and uniform. Two embodiments are particularly used.
- the first mode is illustrated in Figure 1.
- a printer has a tank 111 containing electrically conductive ink 110 which is distributed through a distribution channel 113 to a drop generator 116.
- drop generator 116 forms from the pressurized ink contained in the distribution channel 113 an inkjet and splits this stream into a train of drops.
- These drops are electrically charged selectively at by means of a charging electrode 120 supplied by a voltage generator 121.
- the charged drops pass through a space between two electrodes deviation 2, 3. Depending on their charge, they are more or less deviated.
- the least or not deviated drops are directed to a recuperator or a gutter 6 ink while the other deflected drops are directed towards a substrate 27 carried locally by a support 13.
- the successive drops of a salvo reaching the substrate 27 can thus be deflected towards an extreme low position, an extreme position high and successive intermediate positions. All the drops of the salvo form a line of width ⁇ x perpendicular to a direction Y of advance relative of the print head and the substrate.
- the print head is formed by means 116 of jet generation and fractionation ink, the charge electrode 120, the charge electrodes deviation 2, 3, and the gutter 6. This head is in general enclosed in a casing not shown.
- the time between first and last drop a burst is very short. As a result, despite a continuous movement between the print head and the substrate, we can consider that the substrate does not have moved relative to the print head during time for a salvo.
- the bursts are fired at intervals regular space.
- the second deflection technique differs from the previous one by the causes at least part of at least one of the two active surfaces forms a non-zero angle with the axis of the inkjet 1.
- Geometry is one of the most usual and retains great simplicity.
- the plates are generally parallel and spaced apart lower than that adopted in the first mode of production.
- the electric field prevailing in this upstream part 15 between the two plates 2, 3, reached then a value at least equal to that of the first mode but for a lower potential difference. he then becomes necessary, to allow printing large width segments, avoid drips the most loaded, and therefore the most deviated, to enter colliding with the electrode 3 towards which they are deflected.
- the chosen solution is to tilt relative to the axis of the jet a downstream part 16 of this electrode 3. It is clear that in the downstream region, the value of the electric field falls very important, is no longer optimal, which leads to a strong deterioration in deflection efficiency. In result.
- the main advantage of the second variant on the first is to provide substantially equivalent performance for a lower potential difference.
- Patent application FR 77 33131 proposes a variant, illustrated in FIG. 3, in which the surface active, towards which the deflection of drops, has a double longitudinal curvature and cross.
- the convexity resulting from the adoption of these curvatures eliminate any metallic edges lively and thus minimize the risk of breakdown electric.
- the longitudinal curvature of the active face 17 of electrode 3, also provides a transition improved between upstream region 15 with strong field electric and downstream region 16 low field electric.
- non-equipotential In order to maintain deflection efficiency optimal throughout the drop path, a second technical path called “non-equipotential" was imagined, in which at least one of the two active surfaces 2, 3 is brought to a potential constant but non-uniform electric.
- the request of GB patent 2,249,995 A presents, in this spirit, two different designs.
- the first shown schematically on Figure 4, uses two metal electrodes planes 2, 3 between which a difference is created potential Vd.
- piece 18 made of a material dielectric whose shape resembles that of a portion of elliptical cylinder.
- a curved face 19 of this piece is placed opposite jet 1 and constitutes the active surface of the deflection device on which the electrical potential is not uniform.
- the second design presented in the patent GB 2 249 995-A recommends the use of a material resistive to form the active face of one of the two deflection device electrodes. It is proposed to obtain, by judiciously supplying this electrode at its two ends, a variation of the potential electric along its active surface. This non-uniformity must then generate a deflection field Ed such that its value is approximately optimal in each point between the two surfaces of the device.
- This solution is criticized in said patent GB 2 249 995 A, emphasizing the strong current consumption - and therefore the important heat generation - which would imply its implementation.
- Patent FR 97 06799 contains an analysis and a detailed review of previous proposals. This document essentially attempts to describe a non-equipotential device free from the difficulties of operation described above. To this end, one at least two active surfaces are produced under form of an insulating substrate on which is deposited, depending on the height of this surface, a plurality electrodes connected to different sources of voltage. A resistive coating covers the substrate insulator and electrodes. A wise choice of number of electrodes, the value of the applied voltages and the value of the square resistance of the coating resistive allows the creation of an optimal Ed field on full height of the deflector while minimizing and controlling electrical currents and parasitic heat fluxes.
- the objective of the present invention is to produce an electrostatic deflection device that can be integrated into a print head an inkjet printer, and whose efficiency equal to or surpass that of non-equipotential designs for a much more cost price weak and this by means of an arrangement of electrodes deflection whose active surfaces are brought to uniform electrical potentials.
- Another object of the present invention is to constitute an arrangement of deflection electrodes reduced footprint and leading to a reduction of the size of a printhead of a printer in which this head is incorporated.
- Another object of the present invention is get deflection performance with a significantly reduced tension compared to usual electrode supply voltages equipotential deflection and thus facilitate integration into a print head of said electrodes and a generator of said voltage scaled down.
- Yet another object of the invention is to significantly reduce the risk of projection accidental ink on the active surface of deflection electrodes.
- the invention relates to an inkjet printer printhead continuous equipped with means for generating an ink jet along an axis of the inkjet, from at least one jet ejection nozzle, and to split the jet into a train of drops, means to charge electrically selectively the different drops of the train of drops, and electrodes of deflection of the charged drops, deflecting the drops in depending on the value of the charge received, either towards a drop recovery gutter, either towards a printing substrate locally supported by a support of the printing substrate, the deflection electrodes each having relative to the jet ejection nozzle an upstream part, and a downstream part, a surface active of each deflection electrode being a surface of said electrode which is opposite the train of drops, printhead characterized in that the jet drop deflection electrodes include two electrodes one first and one second, the active surface of the first electrode having a first concave longitudinal curvature whose local radius of longitudinal curvature is located in a plane formed by the axis of the inkjet and a direction
- the function of the recess is to allow the passage of undeviated or little drops deflected through the first electrode.
- the undeflected drops substantially follow a trajectory, which as a first approximation, can be considered straight.
- the most upstream part of the outline of the recess will be located in the immediate vicinity and slightly upstream of the point of intersection of the first electrode with the axis of the jet.
- the most upstream part of the contour of the recess must therefore be located at a distance sufficient from the point of intersection of the first electrode with the axis of the jet so that a drop not deviated can pass through the recess of the electrode with almost zero probability to intercept the electrode.
- the lightly charged drops and therefore slightly deviated have a trajectory whose curvature may be less than that of the first electrode.
- the trajectory of the slightly deviated drops is therefore likely to be secant on the active surface of the first electrode.
- the recess must be such that it allows the passage of these little deviated drops.
- the possible point of intersection of the trajectory of a little deviated drop and from the surface of the front electrode recess is necessarily downstream of the point which has been defined above as the most upstream of the recess. We can therefore consider that the downstream part of the first electrode is a part of this electrode located downstream of the point of intersection of the electrode and the jet axis.
- this recess will present as having a line of symmetry a line defined by the intersection of the front electrode obviously, with a plane containing the axis of the jets and the direction of deflection of the drops.
- the recess will have so an oblong shape centered on the line of symmetry defined above.
- the width of the recess results from a compromise between two requirements, let the safe drops through the first electrode impact between the drop and the electrode, which requires the recess to be wide, do not decrease the inter-electrode field too much, which requires that the recess is narrow.
- the diameter of the ink drops is around several tens of ⁇ m, typically between 30 and 140 ⁇ m, for example 100 ⁇ m.
- the width measured perpendicular to this line is greater than the diameter of the drops and ideally of the order of two to three times the diameter drops, typically 200 to 300 ⁇ m. However, to be sure to avoid clashes between drops and first electrode, it may be necessary to fix a width of the order of 8 to 10 times the diameter of drops.
- the curvature of the second electrode is such that the active surface of this second electrode is substantially parallel to that of the first electrode so that the two active surfaces have between they have a substantially constant spacing e.
- the contour of the recess has a most point upstream located near the intersection, before obviously from the first electrode with the jet axis ink.
- the recess has a symmetry with respect to a plane containing the axis of the inkjet.
- the recess has a width between two and ten times the diameter of the ink drops.
- the recess has the shape of a slit oblong, an opening of which opens onto the more downstream from the first electrode.
- the spacing between the active surfaces of two electrodes is substantially constant from upstream to downstream of the electrodes and between 4 and 20 times the diameter of the ink drops is approximately between 0.5 and 3 mm.
- a most downstream edge of the first electrode is closer to the print medium than a surface the most downstream of the recovery gutter.
- the second electrode is provided, from its active surface, of a groove traced along an axis contained in a plane containing the axis of the jet.
- a bottom of the groove is connected to the surface active of the second electrode by a curved surface transversely along value radii of curvature greater than the radius of the ink drops.
- Languages of the first electrode formed of on either side of the recess and the second electrode are bent transversely along radii of curvature of value greater than the radius of the drops ink.
- Figure 7 has parts A, B, C, and D.
- Part A represents a perspective view, seen from side, of a set of two electrodes according the invention.
- Part B represents a section of the two electrodes along line B-B in part A.
- the part It is a perspective view of a split electrode according to the invention.
- Part D represents a view in perspective of the convex electrode intended to make see a surface indentation.
- Figures 5, parts A and B are respectively a schematic front and left view illustrating a particular embodiment electrostatic deflection electrodes according to the invention, implemented within a head continuous jet printing, deflected single nozzle.
- the Figures 6, parts A and B, are respectively cuts made at the level of the Z axis of FIG. 5, part A, for two embodiments.
- Figure 7 is it intended to make see, more realistically, the shape of electrodes in a particular embodiment.
- Born are shown in Figures 5 - 7 that the elements relating to the electrodes which are the subject of the invention.
- the other components of the print head are known of the skilled person and their description such as illustrated in relation to the prior art, by example in relation to figure 1 is sufficient for a good understanding of the invention.
- a train of selectively charged drops 1 enters the space delimited by electrodes 2 and 3 between which there is a potential difference Vd supplied by a voltage generator 30.
- the electrodes 2 and 3 are of substantially equal heights.
- a plane tangent to electrodes 2 and 3 respectively in their most upstream part is parallel to the axis jets or intersecting at this axis at a weak angle.
- the active surface 11 of the first electrode 2 has a substantially concave longitudinal curvature opposite to that of the active surface 10 of the second electrode 3.
- An active surface 10 of electrode 3 has a convex longitudinal curvature such that this surface is in a downstream part, substantially parallel to a trajectory 4, represented by dotted, the most deviated drops. In a way known, a trajectory can be viewed by strobe lighting of the drops.
- the spacing e separating the surfaces 10 and 11, is substantially constant over the entire height of electrodes 2, 3.
- the value of the spacing e is less than 3.5 mm, preferably less than 2 mm.
- a recess 12 which in the example shown, has the form of a slot 12 visible in part B of figure 5 and B and C of the Figure 7, is practiced in the downstream part of electrode 2.
- the width of the recess 12 is larger than the diameter of the ink drops. In practical, we advantageously limit the width of the recess 12 so that the fall of the value of the Ed field existing in the downstream part of the electrodes 2, 3 does not exceed 15% of that of the field optimal created in its upstream part.
- the electrodes 2 and 3 are preferably made of stainless metal.
- the longitudinal curvature of the electrodes is preferably constant, so that the surfaces active electrodes 2, 3 are formed substantially by axis cylindrical surface parts perpendicular to the axis of the jet.
- the operation is as follows.
- the electric field Ed arising from the potential difference Vd deflects the ink drops in proportion to their electrical charge along predefined trajectories.
- Trajectory 4 is that followed by the drops carrying the maximum load Qmax. It is therefore the trajectory of the most diverted.
- the active surface of the second electrode 3 is calculated so that the probability of encountering the trajectory 4 with the second electrode is almost null, although the trajectory 4 is parallel and close to the active surface of the second electrode 3 at least in a downstream part of this surface.
- the trajectory 5 is that traveled by the drops with the minimum load Qmin to avoid the recovery gutter 6 and therefore to be directed to the printing substrate.
- Drops with electrical charges between the values Qmax and Qmin follow intermediate trajectories such that, for example, trajectories 7 or 8.
- the trajectory 9 corresponds to that of drops with a quantity of charge less than Qmin: such drops are collected by the recovery gutter 6 and recycled to a printer ink system.
- the slot 12 shown in Figure 5 part B and figure 7 part B and C is as explained above such as the least deviated drops and in particular those whose charge is less than Qmin go to through this slot.
- the most upstream part 39 of the contour 38 of this slot 12 is located in a place close to the point of intersection of the axis of the jet with the first electrode 2. Because the drops whose charge is less than Qmin and the least charged drops among those whose charge is between Qmin and Qmax pass through slot 12 of the electrode 2, the dispersion of the drops can be kept despite a spacing e between the electrodes 2 and 3 reduced by compared to the electrodes of the prior art.
- the small spacing e allows the use of a value of Vd of the order of 3 kV at location of the 8 to 10 kV usually used in equipotential electrode devices of the art prior. It is therefore particularly advantageous to realize the potential difference Vd by carrying the electrode 2 at the reference potential of the ink, usually the printer's ground potential. In these conditions, unlike the prior art or what potential is a potential opposite to that of electrode 3, relative to the ink potential, it becomes possible to bring together or even integrate the recovery gutter 6 and electrode 2 without risk of electric breakdown between these two elements and without altering the Ed field between the two electrodes.
- the distance d1 between the lower edge 21 of the gutter 6 and the support 13 may become greater than the distance d2 separating the downstream end 22 of the electrodes 2, from this same printing medium 13. This gives a significant reduction in the path taken by the drops directed towards the gutter 6 and therefore a decrease in the probability of not reaching this gutter by these drops.
- Parts A and B of Figure 6 and the part D of Figure 7 each illustrate an advantageous mode for making electrodes 2 and 3.
- Each of these modes is illustrated in figure 6 by a scale section enlarged performed approximately along the z plane defined in figure 5 part A.
- the shape of these curves can characterize, over their entire height or at less in a downstream part, the active faces 10 and 11.
- transverse curvatures illustrated in figure 6 part A is to eliminate any sharp metal edges or roughness likely generate an electric shock phenomenon which lead to a weakening of the Ed field or to a electric breakdown.
- the transverse radius of curvature of the surface 11 of the tongues 24, 25 and of the electrode 3 is in every point superior to that of the drops ink.
- FIG. 6 part B shows an electrode 2 having the same curvature characteristics transverse as the electrode 2 represented in part A.
- the active surface 10 of the electrode 3 is also with a transverse curvature having the same capacities that the electrode 3 represented in part A, at reduce the occurrence of electric shocks.
- the electrode 3 also has an indentation or longitudinal groove 14. This indentation can extend over the entire height of the surface 10 or over a downstream part only as illustrated in FIG. 7 parts A and D. Indentation 14 is located transversely opposite recess 12 of electrode 2. The width of the indentation 14 is greater than the diameter of the ink drops but remains thin enough not to move away significantly the Ed field of its optimal value.
- Vd the low value of Vd as well as the top positioning of the recovery gutter 6 allow a significant reduction in the size of the print head and drop path ink. Consequently the parasitic variations of trajectories of drops are of a weak amplitude, and the print quality is better.
Abstract
Description
- une grande valeur de e, typiquement 5 mm, est indispensable pour permettre l'impression de segments de grandes largeurs aux distances d'impression usuelles. Un tel espacement implique l'utilisation d'une très haute valeur de Vd, environ 8 kV, qui ne peut être générée au sein de la tête d'impression par manque de place, nécessite une connectique élaborée et conduit généralement à porter chacune des électrodes à des potentiels de signes opposés par rapport au potentiel de référence de l'encre ;
- une telle valeur de différence de potentiel oblige
également à respecter des écartements minimum avec
d'autres éléments métalliques de la tête d'impression
- par exemple : électrodes de charge, gouttière de récupération ou capotage, afin d'éviter tout claquage électrique. L'encombrement qui en résulte conduit à allonger inutilement le trajet des gouttes, et donc le temps durant lequel agissent les perturbations d'ordre aérodynamique ou électrostatique, nuisant ainsi à la précision des impacts sur le support d'impression ;
- il est connu de l'homme du métier que la valeur du champ de claquage entre deux électrodes plongées dans un milieu gazeux, tel que l'air, est une fonction décroissante de l'espacement e entre les deux électrodes. La forte valeur de e caractérisant ce premier mode de réalisation et les contraintes relatives à l'évitement de claquage limite la valeur du champ de déflexion Ed à une valeur inférieure à la valeur optimale. L'impression des segments de grandes largeurs requiert donc des plaques de déflexion de hauteur importante, typiquement 25 mm, de façon à obtenir la déflexion maximum recherchée par une action plus longue du champs électrique. Cette caractéristique contribue également à l'allongement du trajet des gouttes vers le support d'impression.
- de coût : la pièce supplémentaire 18 de forme complexe et dotée d'un très bon aspect de surface est rendue nécessaire ;
- de fabrication : en sus du respect des tolérances dimensionnelles, le report de la pièce diélectrique 18 requiert un collage résistant aux aspersions d'encre.
- de fonctionnement : la surface active 19 de la pièce diélectrique 18 ne permet pas l'évacuation de charges électriques parasites en provenance du milieu gazeux ambiant ou de gouttelettes d'encre accidentellement projetées sur la paroi. L'accumulation de ces charges électriques conduit rapidement à une forte dégradation de la valeur du champ Ed.
- voie équipotentielle : conception simple mais faible efficacité de déflexion.
- voie non-équipotentielle : efficacité de déflexion accrue mais mise en oeuvre difficile en raison des coûts de fabrication et des principes de fonctionnement retenus.
- la figure 1, est une représentation schématique d'une tête d'impression comportant des électrodes équipotentielles de déflexion selon l'art antérieur ;
- les figures 2, et 3 sont des représentations schématiques d'électrodes équipotentielles de déflexion d'une tête d'impression selon l'art antérieur ;
- la figure 4 est une représentation schématique d'électrodes non-équipotentielles de déflexion d'une tête d'impression selon l'art antérieur ;
- la figure 5 comporte une partie A et une partie B. La figure 5 partie A est une vue de face d'électrodes de déflexion électrostatique réalisées suivant l'invention. La figure 5 partie B représente la vue de gauche du schéma porté sur la figure 5 partie A ;
- la figure 6 comporte une partie A et une partie B. Les parties A et B représentent chacune une coupe transversale d'électrodes de déflexion électrostatique réalisées suivant une variante de l'invention.
- pénètrent dans l'indentation 14 sans heurter la
surface 10,
subissent, dans l'indentation 14, l'action d'un très faible champ électrique. Cette chute de la valeur du champ provoque une modification des trajectoires erronées de manière à les rapprocher, en sortie du dispositif de déflexion, de la trajectoire 4 des gouttes les plus déviées, dont le rapport charge sur masse respecte la valeur maximale prédéterminée. Ainsi ces gouttes bien qu'ayant une trajectoire erratique, ne heurtent pas l'électrode 3. De ce fait l'électrode 3 reste propre ce qui signifie qu'elle n'est pas déformée par la présence d'encre sur l'électrode. En conséquence les gouttes suivantes ne subiront pas de déformation de trajectoire dues à la présence éventuelle d'une goutte à trajectoire erratique. Cette disposition présente aussi pour avantage de faciliter les réglages de tension à appliquer aux électrodes à la mise en route de l'imprimante.
- simplicité de conception et efficacité de déflexion sont simultanément réalisées ;
- protection contre certaines projections d'encre sur les électrodes par ajustement de la géométrie d'une surface active au moins.
Claims (11)
- Tête d'impression d'une imprimante à jet d'encre continu équipée de moyens (116) pour générer un jet d'encre selon un axe du jet d'encre, à partir d'au moins une buse d'éjection du jet, et pour fractionner, le jet en un train de gouttes, de moyens (120, 121) pour charger électriquement de façon sélective les différentes gouttes du train de gouttes, et d'électrodes (2, 3) de déviation des gouttes chargées, déviant les gouttes en fonction de la valeur de la charge reçue, soit vers une gouttière (6) de récupération de gouttes, soit vers un substrat (27) d'impression soutenu localement par un support (13) du substrat (27) d'impression, les électrodes (2, 3) de déviation ayant chacune par rapport à la buse d'éjection du jet une partie amont (15), et une partie aval (16), une surface active (11, 10) de chaque électrode (2, 3) de déviation étant une surface de ladite électrode (2, 3) qui est en regard du train de gouttes, tête d'impression caractérisée en ce que les électrodes (2, 3) de déviation des gouttes du jet comprennent deux électrodes (2, 3) une première (2) et une seconde (3), la surface active (11) de la première électrode (2) présentant une première courbure longitudinale concave dont le rayon local de courbure longitudinale est situé dans un plan formé par l'axe du jet d'encre et une direction de déviation des gouttes, en ce que la surface active (10) de la seconde électrode (3) présente une première courbure longitudinale convexe, et en ce que la première électrode présente dans sa partie aval (16) un évidement (12) ayant un contour (38).
- Tête d'impression selon la revendication 1 caractérisée en ce que le contour (38) a un point le plus amont situé au voisinage de l'intersection avant évidement de la première électrode (2) avec l'axe du jet d'encre.
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que l'évidement (12) présente une symétrie par rapport à un plan contenant l'axe du jet d'encre.
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que l'évidement (12) a une largeur comprise entre 4 et 20 fois le diamètre des gouttes d'encre.
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que l'évidement (12) présente la forme d'une fente oblongue dont une ouverture débouche sur la partie (22) la plus avale de la première électrode (2).
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que l'espacement entre les surfaces actives (10, 11) des deux électrodes (3, 2) est sensiblement constant de l'amont à l'aval des électrodes et compris entre 4 et 20 fois le diamètre des gouttes d'encre.
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce qu'un bord le plus aval (22) de la première électrode est plus proche du support d'impression (13) qu'une surface (21) la plus avale de la gouttière de récupération (6).
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que la seconde électrode (3) a une rainure (14) selon un axe contenu dans un plan contenant l'axe du jet.
- Tête d'impression selon la revendication 8 caractérisée en ce que un fond de la rainure (14) est raccordé a la surface active (10) de la seconde électrode (3) par une surface courbée transversalement selon des rayons de courbure de valeur supérieure au rayon des gouttes d'encre.
- Tête d'impression selon l'une des revendications précédentes caractérisée en ce que des langues (24, 25) de la première électrode formées de part et d'autre de l'évidement (12) et la seconde électrode (3) sont courbées transversalement selon des rayons de courbure de valeur supérieure au rayon des gouttes d'encre.
- Imprimante caractérisée en ce qu'elle est équipée d'une tête d'impression selon l'une des revendications précédentes.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0102638A FR2821291B1 (fr) | 2001-02-27 | 2001-02-27 | Tete d'impression et imprimante a electrodes de deflexion ameliorees |
FR0102638 | 2001-02-27 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1234670A2 true EP1234670A2 (fr) | 2002-08-28 |
EP1234670A3 EP1234670A3 (fr) | 2007-03-07 |
EP1234670B1 EP1234670B1 (fr) | 2008-07-09 |
Family
ID=8860487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02290450A Expired - Lifetime EP1234670B1 (fr) | 2001-02-27 | 2002-02-25 | Tête d'impression et imprimante à électrodes de déflexion améliorées |
Country Status (7)
Country | Link |
---|---|
US (1) | US6758555B2 (fr) |
EP (1) | EP1234670B1 (fr) |
JP (1) | JP2002264339A (fr) |
CN (1) | CN1157290C (fr) |
DE (1) | DE60227436D1 (fr) |
ES (1) | ES2310200T3 (fr) |
FR (1) | FR2821291B1 (fr) |
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WO2011110609A1 (fr) | 2010-03-10 | 2011-09-15 | Markem-Imaje | Interface utilisateur pour imprimante industrielle |
EP2666634A2 (fr) * | 2012-05-22 | 2013-11-27 | Hitachi Industrial Equipment Systems Co., Ltd. | Appareil d'enregistrement à jet d'encre |
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FR2835217B1 (fr) * | 2002-01-28 | 2004-06-25 | Imaje Sa | Tete d'impression a double buse d'axes convergents et imprimante equipee |
DE10327430A1 (de) * | 2003-06-18 | 2005-01-05 | Abb Patent Gmbh | Ultraschall-Stehwellen-Zerstäuberanordnung |
US7080897B2 (en) * | 2003-10-31 | 2006-07-25 | Hewlett-Packard Development Company, L.P. | System for delivering material onto a substrate |
FR2892052B1 (fr) * | 2005-10-13 | 2011-08-19 | Imaje Sa | Impression par deflexion differentielle de jet d'encre |
US20070115331A1 (en) * | 2005-11-18 | 2007-05-24 | Videojet Technologies Inc. | Non-planar deflection electrode in an ink jet printer |
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EP1923217A1 (fr) * | 2006-11-16 | 2008-05-21 | Domino Printing Sciences Plc | Améliorations concernant imprimantes à jet d'encre continu |
US20080136861A1 (en) * | 2006-12-11 | 2008-06-12 | 3M Innovative Properties Company | Method and apparatus for printing conductive inks |
US7697256B2 (en) * | 2007-04-12 | 2010-04-13 | Hewlett-Packard Development Company, L.P. | Directing aerosol |
DE102007062620A1 (de) * | 2007-12-22 | 2009-07-09 | Schott Solar Gmbh | Verfahren und Vorrichtung zur Herstellung eines semitransparenten photovoltaischen Moduls |
FR2948602B1 (fr) | 2009-07-30 | 2011-08-26 | Markem Imaje | Dispositif de detection de directivite de trajectoires de gouttes issues de jet de liquide, capteur electrostatique, tete d'impression et imprimante a jet d'encre continu devie associes |
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JP5725800B2 (ja) * | 2010-06-24 | 2015-05-27 | キヤノン株式会社 | 液体吐出ヘッド |
FR2971451B1 (fr) | 2011-02-11 | 2013-03-15 | Markem Imaje | Detection de plage de stimulation dans une imprimante a jet d'encre continu |
DE102011113664A1 (de) * | 2011-09-20 | 2013-03-21 | Simaco GmbH | Verfahren und Vorrichtung zur Homogenisierung von Tinte für Inkjet-Geräte |
CN107745580B (zh) * | 2017-11-02 | 2023-04-07 | 北京赛腾标识系统股份公司 | 偏转电极及喷码机喷头 |
KR20200077889A (ko) * | 2018-12-21 | 2020-07-01 | 세메스 주식회사 | 인쇄 장치 및 인쇄 방법 |
CN109808310B (zh) * | 2019-03-07 | 2020-11-06 | 浙江鸣春纺织股份有限公司 | 一种喷码机连续喷墨打印装置 |
GB2600406A (en) * | 2020-10-26 | 2022-05-04 | Videojet Technologies Inc | Electrode |
JP2022120865A (ja) | 2021-02-08 | 2022-08-19 | 株式会社日立産機システム | インクジェット記録装置 |
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FR2374169A1 (fr) | 1972-11-21 | 1978-07-13 | Ibm | Aspirateur de gouttelettes dans une imprimante a jet d'encre |
WO1989003678A1 (fr) | 1987-10-30 | 1989-05-05 | Stolle Research & Development Corporation | Microspheres a faible solvant residuaire et procede de microencapsulage |
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FR2761283A1 (fr) | 1997-03-25 | 1998-10-02 | Ems Societe | Procede de sectionnement d'un tube ou de decalottage d'une partie tubulaire fermee et moyens destines a le mettre en oeuvre |
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CA1158706A (fr) * | 1979-12-07 | 1983-12-13 | Carl H. Hertz | Methode et dispositif de controle de la charge electrique de goutelettes, et imprimante au jet d'encre garnie du dispositif |
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- 2001-02-27 FR FR0102638A patent/FR2821291B1/fr not_active Expired - Fee Related
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2002
- 2002-02-04 JP JP2002027204A patent/JP2002264339A/ja not_active Withdrawn
- 2002-02-21 US US10/080,025 patent/US6758555B2/en not_active Expired - Lifetime
- 2002-02-25 EP EP02290450A patent/EP1234670B1/fr not_active Expired - Lifetime
- 2002-02-25 DE DE60227436T patent/DE60227436D1/de not_active Expired - Lifetime
- 2002-02-25 ES ES02290450T patent/ES2310200T3/es not_active Expired - Lifetime
- 2002-02-27 CN CNB021065500A patent/CN1157290C/zh not_active Expired - Lifetime
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FR2374169A1 (fr) | 1972-11-21 | 1978-07-13 | Ibm | Aspirateur de gouttelettes dans une imprimante a jet d'encre |
WO1989003678A1 (fr) | 1987-10-30 | 1989-05-05 | Stolle Research & Development Corporation | Microspheres a faible solvant residuaire et procede de microencapsulage |
US4845512A (en) | 1988-10-12 | 1989-07-04 | Videojet Systems International, Inc. | Drop deflection device and method for drop marking systems |
GB2249995A (en) | 1990-11-21 | 1992-05-27 | Linx Printing Tech | Electrostatic deflection of charged particles. |
WO1998028148A1 (fr) | 1996-12-23 | 1998-07-02 | Domino Printing Sciences Plc | Imprimante a jet d'encre continu |
FR2761283A1 (fr) | 1997-03-25 | 1998-10-02 | Ems Societe | Procede de sectionnement d'un tube ou de decalottage d'une partie tubulaire fermee et moyens destines a le mettre en oeuvre |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011110609A1 (fr) | 2010-03-10 | 2011-09-15 | Markem-Imaje | Interface utilisateur pour imprimante industrielle |
EP2666634A2 (fr) * | 2012-05-22 | 2013-11-27 | Hitachi Industrial Equipment Systems Co., Ltd. | Appareil d'enregistrement à jet d'encre |
EP2666634A3 (fr) * | 2012-05-22 | 2014-03-12 | Hitachi Industrial Equipment Systems Co., Ltd. | Appareil d'enregistrement à jet d'encre |
Also Published As
Publication number | Publication date |
---|---|
ES2310200T3 (es) | 2009-01-01 |
FR2821291B1 (fr) | 2003-04-25 |
EP1234670B1 (fr) | 2008-07-09 |
US20020118258A1 (en) | 2002-08-29 |
US6758555B2 (en) | 2004-07-06 |
JP2002264339A (ja) | 2002-09-18 |
EP1234670A3 (fr) | 2007-03-07 |
CN1365892A (zh) | 2002-08-28 |
DE60227436D1 (de) | 2008-08-21 |
CN1157290C (zh) | 2004-07-14 |
FR2821291A1 (fr) | 2002-08-30 |
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