EP1092542A1 - Imprimante et procédé d'impression par jets d'encre - Google Patents
Imprimante et procédé d'impression par jets d'encre Download PDFInfo
- Publication number
- EP1092542A1 EP1092542A1 EP00402817A EP00402817A EP1092542A1 EP 1092542 A1 EP1092542 A1 EP 1092542A1 EP 00402817 A EP00402817 A EP 00402817A EP 00402817 A EP00402817 A EP 00402817A EP 1092542 A1 EP1092542 A1 EP 1092542A1
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- EP
- European Patent Office
- Prior art keywords
- electrodes
- jet
- ink
- drops
- pair
- 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.)
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Classifications
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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
- B41J2/105—Ink jet characterised by jet control for binary-valued deflection
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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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
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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
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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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
- B41J2002/033—Continuous stream with droplets of different sizes
Definitions
- the invention lies in the field of continuous inkjet printers. It also concerns a method of selective projection of parts of a jet conductive liquid and in particular a process continuous inkjet printing.
- the process and the printer according to the present invention can be used especially in all areas manufacturers linked to writing, marking, coding, industrial addressing and decoration.
- the amount of charge transferred to drops of the spray is variable.
- Each drop registers, when passing through the second arrangement of electrodes at constant field, an increasing deflection with the electrical charge previously assigned to it and is oriented towards a specific point of the support printing.
- This technology thanks to these multiples deflection levels, allows a single nozzle to print, by segment or frame, - stitch line of a given height -, the entire pattern.
- the passage from one segment to another is carried out by the continuous displacement, perpendicular to said segment, substrate relative to the print head.
- the second variant is that of the continuous jet binary.
- This technique mainly differs from the previous one by the fact that the charge level of drops is binary.
- drops When passing through deflection electrodes, drops are deflected from uniformly or not deviated depending on the load they have received.
- Printing characters or patterns therefore generally requires the use of heads multi-nozzle printing, the hole spacing coinciding 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, i.e. the binary level of charge is zero.
- the ink that is not used to mark the substrate is directed to a gutter or an ink collector not used and is recycled in an ink circuit of so that it comes back to the nozzles printing.
- a method of breaking the jet into drops is very well described for example in a patent bearing the number US-A-4,220,958 whose inventor is Mr. CROWLEY.
- the inkjet conductive passes through carried electrodes periodically at a relatively high potential. Under the action of these electrodes, the inkjet is charged. The charges are attracted by the electrodes so that a force transverse to the jet distorts the surface of the jet. The jet speed and the transverse movement of the surface of the jet combine so that at a certain distance from the electrodes, the jet breaks in one succession of drops.
- the emission nozzles ink are vibrated.
- the jet of liquid is electro-hydrodynamically excited with an electro-hydrodynamic exciter (EHD).
- EHD electro-hydrodynamic exciter
- a third technique is to impose a variation of pressure on the liquid at the nozzle by means of a piezoelectric crystal introduced into a cavity nozzle supply. This last technique is dominant in the literature and is used by example in the machine IBM 6640 (registered trademark).
- CROWLEY's invention concerns an electro-hydrodynamic exciter in which the length of the electrodes crossed by the inkjet is equal to half a times the distance between the drops.
- thermoresistive elements Another method of inkjet stimulation for its transformation into drops is described, by example in US-A-4,638,328 DRAKE et al. he it is an activation by thermoresistive elements.
- a second family of projection printing so-called drop on demand ink is basically implementation in office printers. he is to print text or graphic patterns in colors on paper or plastic supports. AT in contrast to continuous jet printing, drop-on-demand technologies directly generate and only the ink drops actually necessary to print the desired patterns. Onne therefore finds neither an electrode nor a recirculation gutter ink between the outlet face of a nozzle and the print media. Drop printers demand are necessarily multi-nozzle machines and require an ink ejection actuator by orifice.
- U.S. Patent 4,230,558 (Fulwyler, 1980) describes a biological cell sorting device based on the creation, on demand, of a drop within a jet continuous fluid. During operation, the jet takes on the appearance of a succession of isolated drops, framed by lengths of fluid variables.
- Electro-HydroDynamic actuator electro-high voltage
- a heat source external laser
- EHD stimulation and stimulation intermittent a jet can be found in the U.S. Patent 4,220,958 (J.M. Crowley) and in an article by D. W. Hrdina and J. M. Crowley (IEEE transactions on Industry Applications, Vol. 25, n ° 4, July / August 1989, titled “Drop-on-demand Operation of Continuous Jets Using EHD Techniques "(pages 705-710).
- the objective of the present invention is to retain the benefits of jet technology continuous while combining it with some of the benefits drop-on-demand technique.
- the invention aims to suppress each jet the set of individual drop charge electrodes and the control circuit associated with this set of electrodes individual. It also aims to remove the crosstalk between different jets of the same head printing. It has been seen that according to the technique pressurized inkjet is divided into a succession of drops. Sorting the drops in front go print the substrate is done downstream from the point where the drops known as the breaking point are formed, by a arrangement of electrodes. It is this arrangement individual electrodes at each of the nozzles which creates on the one hand a complexity of realization and on the other apart, crosstalk problems.
- Sorting the drops to be deflected towards the substrate or to a recovery gutter is made in function of data from a set of generally numerical data defining the pattern to to print.
- the digital data defining the pattern to be printed are no longer used downstream of the drop formation, but upstream. These are data that will determine whether or not the formation of drops.
- the ink jet of a nozzle will no longer be divided into a succession of drops but in a succession of sections and drops.
- each nozzle is equipped with a means for forming drops ink.
- Each means of ink drop formation is coupled to the printing control means.
- the means of sorting of drops and sections for each of the jets are common to all jets.
- the sections are deflected to the ink recovery means and the drops reach the substrate.
- Each nozzle of the multi-nozzle device has its own own means of forming drops in the jet. This medium is controlled by signals formed from digital data relating to the line printed by the nozzle.
- we will protect the area where they form drops of influence of the electric field caused by means of deflection of the sections.
- the means of protection of the drops against the influence of the deflection field of the sections will formed by one or more electrodes or pairs electrodes placed upstream of the electrodes deflection and arranged to protect the formation area drops of the influence of the field created by section deflection electrodes.
- the drops will not be electrically charged and will not be deflected when they pass through the electric field of deflection located downstream.
- at least part of each section will be at the time of the formation of drops and therefore when detaching the part upstream of the section of the rest of the jet in an area of potential not zero.
- the section will be electrically charged and will be influenced by the field of deflection.
- the means for forming the drops will consist of heating elements used as actuators. These actuators cause the local heating of ink on demand and for one predetermined time to modify at least one physical characteristic of the ink capable of causing a disturbance in the jet. This disturbance is translated at a predetermined distance by training drops from the jet.
- this means to cause drops we can cite elements thermo-resistive as described for example in the DRAKE patent, in a number equal to that of the nozzles of the print head and placed near the nozzles. he could also be electro-hydrodynamic means as one of those described in the CROWLEY patent. he may also be as in the prior art a piezoelectric crystal placed in a cavity feeding the nozzle. Note that in this case, the signal not being periodic, the impulse form of the signal must be adapted so as not to generate residual vibrations disturbing the print head operation.
- the rising edge and the falling edge of an impulse aimed at deforming the piezoelectric crystal should have such a shape that there are no residual vibrations annoying of the crystal after the passage of the impulse. These residual vibrations could lead to unwanted drop formation.
- the deflection of the ink parts not directed towards the substrate is obtained by means of a electric field created downstream of the training points drops, and preferably the area containing all the points of creation of the drops of the jet is protected from the influence of the electric field of deflection.
- the jets come from nozzles whose axes are aligned.
- the axes of the nozzles are therefore contained in a plane P.
- the regions of space crossed by the jets are therefore centered regions on this plane P and delimited by planes N perpendicular to this plane P or by surfaces secants at plane P at a line common to the plane P and to a plane N.
- the drop creation area is contained in a region of zero or negligible potential, so that the drops are electrically neutral or little loaded. At least part of the downstream section of each drop, is at the moment of detachment of said drop in a region of potential not negligible so that this section is loaded electrically when it detaches from the jet.
- a region of space located downstream of the drop formation area is the seat of a field electric allowing significant deflection of sections of ink charged electrically.
- FIG. 1 represents an example comprising a electrode or a central pair of electrodes protection and deflection electrodes.
- FIG. 2 represents an example comprising a upstream pair and downstream pair of electrodes protection and deflection electrodes.
- Figure 3 shows an example with three pairs of protective electrodes and electrodes deflection.
- FIG. 4 represents an example comprising, in addition protection and deflection electrodes, charge electrodes located axially between the protection and deflection electrodes.
- Figure 5 shows an example of a control of the means for forming the drops.
- FIG. 1 shows a schematic view of a first arrangement of electrodes of a printer 100 according to an embodiment of a jet printer stimulated continuous multi-nozzle based on the method according to the invention.
- Printer 100 includes a reservoir pressurized 1 equipped with a plurality of calibrated nozzles 2 from which ink jets escape 3. At each nozzle, is associated with a stimulation device 4 placed in tank 1 and controlled by an electronic circuit external 5. The stimulation device 4 associated with a nozzle allows the creation on demand of a drop.
- Each drop is formed on the axis of the jet at which it belongs, at a predetermined distance from the nozzle. This distance is the same for all jets in so that the drops form in a form area elongated centered on a secant DB straight line substantially perpendicular to each of the jets 3.
- the stimulation device 4 is preferably constituted by means causing local ink heating for a period predetermined, for example thermoresistive elements, equal in number to that of the head nozzles printing, placed near the nozzles 2 and controlled individually by an external circuit 5.
- thermoresistive elements equal in number to that of the head nozzles printing
- the patent US-A-4,638,328 Describes an example of such device based on thermoresistive elements, sound operation and an embodiment using chemical machining techniques from the microelectronics industry.
- the stimulation device 4 could also be constituted by a piezoelectric element.
- a known variant represented by dotted lines on Figures 1 to 4 consists of replacing the stimulation thermal or piezoelectric inside the reservoir 1 by electro-hydrodynamic stimulation produced by one or more 4 'electrodes placed at near jets immediately downstream of the nozzle.
- the arrangement of electrodes consists of two groups of electrodes a first group 6 of electrodes and a second group 26.
- the electrodes of the first group 6 are constituted by a central pair 25 of electrodes 15, 16.
- the electrodes 15, 16 of the first group 6 are located on either side of the set of jets 3.
- the pair of electrodes 25 is placed so as to encompass the position DB for forming drops 13. From preferably the DB position of drop formation will be located in the immediate vicinity of the downstream edges of this pair of electrodes.
- the electrodes 15, 16 forming the central pair of electrodes 25 are connected to a same source of potential, preferably equal to potential to which the ink from reservoir 1 is applied general connected to ground, so as to create a field electric zero in the inter-electrode space.
- the pair 25 of electrodes 15, 16 could be replaced by a single U-shaped electrode having two branches 15, 16.
- the branches 15, 16 of the U are equivalent to the electrodes 15, 16 of the pair 25.
- This alternative mode has been shown in dashed lines, figures 1. It will be seen later than group 6 electrode may include additional pairs of electrodes. Whenever the electrodes of a pair are connected to the same potential source, the pair may alternatively be replaced by a U-shaped electrode, each of the two branches of U replacing one electrode of the pair.
- the electrode 26 of the second group 7 is located downstream of the first group of electrodes 6. The electrode 26 is brought to a constant high electric voltage, and creates a field electric in the surrounding space.
- the electric field prevailing in the immediate vicinity of the straight line DB is zero or very small because this space is protected by the first group of electrodes 6.
- Field strength existing in the vicinity of the downstream part of the ink streaks at electrode 26 is high enough to exert an electrostatic influence on these. After the jet breaks, the trajectory of the sections which are electrically charged by electrode 26 will be modified by the field electric, while the trajectory of the drops does not will experience very little influence.
- the sections are directed towards the ink recuperator 11 while the drops 13 are directed towards the substrate 14.
- a second embodiment shown schematically on the Figure 2 differs from the first embodiment shown in Figure 1 in that the first group of electrodes 6 constituting the protection electrodes is split into two pairs of electrodes 21, 22, one upstream pair 21 and downstream pair 22.
- Pair 21 is consisting of two electrodes 17, 18.
- the pair of electrodes 22 consists of two electrodes 19, 20.
- the electrodes 17 and 18 of the pair 21 are located on either side of the ink jet area 3.
- the electrodes 19, 20 of pair 22 are also located on either side of the jet area 3.
- the electrodes of pair 21 are subjected to a same constant voltage V1 and those of the pair 22 are subjected to the same constant voltage of opposite sign V2 preferably equal to -V1.
- the main feature of a group of electrodes such as 21 and 22 is the existence of a approximately flat region ⁇ of space se lying axially between the upstream edges and the edges downstream, respectively pairs of electrodes 21, 22 in which the potential is zero or negligible.
- the plane ⁇ is substantially perpendicular to the whole of the jets 3. If the straight line DB which is the place of formation of drops from different jets 3 is included in this region of space comprising the plane ⁇ then the drops created will carry a charge negligible electric.
- the sections 10 coming off from the jet will be subject to the influence of the electric field formed by the deflection electrode 26 and will undergo a deflection as they pass in the vicinity of the electrode 26.
- the arrangement of electrodes of protection of the area where drops form comprises three pairs of electrodes 21, 22, 25.
- the third pair of electrodes 25 comprising the electrodes 15 and 16 is located at an axial height between the heights of pairs 21 and 22.
- the electrodes 17, 18 of the pair of electrodes 21 are connected to a constant voltage V1.
- the electrodes of the pair 22 are subjected to a constant voltage V2 of sign opposite to that of the value voltage V1 preferably equal to -V1.
- the electrodes of the pair 25 are connected to a constant voltage source preferentially to mass.
- this configuration increases the volume of the region of zero or negligible potential by compared to the reference potential in which it is possible to form drops. Therefore, the position of the right DB, has more tolerances wide, which eases the constraints of precision in terms of training means for drops.
- a first group 6 comprising a pair, two pairs or three pairs of electrodes and one second group 7.
- the group 6 electrodes have the function to impose an area of zero electric field or negligible in the area where the line DB is located located at a predetermined distance from the nozzles 2. From the so the drops are not electrically charged and are virtually unaffected by the from the electrodes of the second group 7.
- this group 7 deflection electrodes can as shown in the Figures 1 to 4 consist of a simple plate 26. It can also consist of a pair of plates parallel to each other, each plate of the pair being brought to a different potential. It can also be consisting of curved conductive elements. In a manner general, the deflection can be operated with all known means for arranging electrodes to deflect ink drops.
- any known arrangement electrodes creating a slender area of potentials zero or weak electrics may be used. This zone will then house the drop formation line.
- the groups of electrodes 6 for protection and 7 for deflection are completed by a third group 30 of electrodes.
- the electrodes of this group 30 are like those of the groups 6 and 7 common to all jets 3.
- this group 30 is composed of a pair 27 of electrodes 28, 29.
- the group 30 electrodes are located downstream of the group 6 protection electrodes and upstream of deflection electrodes of group 7.
- the group 6 electrodes have been shown as a pair of electrodes 25 placed and connected in the configuration described in relationship to Figure 1. It is clear that these group 6 electrodes could have other configurations, in particular those described in relationship to Figures 2 or 3.
- the group 6 electrodes have an upstream pair 21 and a downstream pair 22.
- the downstream pair is preferably brought to a potential different from that of the reservoir from which the jets. Because of this potential difference the pair downstream subjects the trunks to a load.
- the group 30 electrodes make up a group additional charge electrodes.
- the electrodes of the upstream pair 21 and the electrodes of the pair 22 downstream are at potentials as they exist an area of zero potential between the upstream edge of the upstream electrodes and the downstream edge of the downstream electrodes. This is the main function of these electrodes. This function will generally be obtained by wearing these pairs of electrodes at opposite potentials. Although these pairs of electrodes 21,22 provide a charge to the sections 10, the group 30 electrodes are will distinguish electrodes from the downstream pair 22, by the fact that their potential for use is such that these group 30 electrodes provide a charge additional to that provided by the electrodes of the downstream pair 22 of group 6. When the arrangement includes a group (30) of electrodes charge in addition to group 7 of deflection electrodes, group 6 electrodes should be used to protect the DB formation area from drops 13 of the combined influence of the two electric fields, load and deflection.
- the electrodes 15, 16 are brought to a constant potential, preferably the one to which the ink is applied, usually the electrical ground of the printer.
- the electrodes 28, 29 of the third group are subjected to a constant voltage V.
- the assembly shown in Figure 4 allows control improved trajectories of ink sections 10 not used for printing, separating functions load sections and deflect sections and assigning to the electrodes of the third 30 and second 7 electrode groups, respectively.
- each electrode, 15, 16; 17, 18; 19, 20; 26, 28, 29 of the first 6, second 7 and possibly third 30 groups is said to be common to all the jets because in principle of a single conductive part acting on the whole jets. It could also be for one or several electrodes of different conductive parts connected to the same source of potential.
- all electrodes 15-20; 26, 28, 29 have, in projection on a plane parallel to plane P containing the axes of the nozzles, a substantially rectangular shape, a long side of the rectangle extending in a perpendicular direction to the axes of the nozzles.
- the function main of the group 6 protection electrodes the DB drop formation area is to create a zone of zero or negligible potential including the right DB.
- the electric field prevailing between the two electrodes of a pair of protective electrodes is relative to the reference potential, zero or negligible in the absence of the jet, since as we have seen, the electrodes of a pair are at the same potential.
- the presence of the jet does not disturb this state of done, in case this potential is that of ink, which is the case for the central pair 25 when it is present.
- the electrodes of a pair like for example the electrodes of the upstream pairs or downstream are at a potential different from that of ink
- the presence of the ink jet disturbs the field between the jet and each of the electrodes of the pair.
- the resulting from the field vectors on the axial line of jets is zero due to geometric symmetry local and therefore there is no deflection of the jet without the action of electric forces.
- the group 7 electrodes for deflecting sections are distinguished from the protective electrodes or of charge by the fact that these electrodes create, in the absence of a jet, an electric field in a direction substantially perpendicular to the axes of jets and plane P containing the jets.
- the field In the presence of a jet, the field is disturbed by the jet.
- the field is continuously oriented in a direction perpendicular to the jet.
- circuit electronic 5 usable on a printer 100 according to the invention.
- this circuit is connected to a memory 31 for storing digital data.
- this memory (bit-map) 31 feeds sequentially a succession of n memories of line 32 referenced 32-1 to 32-n.
- Data transfers between memory (bit-map) 31 and line memories 32 are controlled so as to itself known by a sequencer.
- the sequencer receives signals from a clock 34 and a position encoder substrate.
- the digital data at the outputs of memories 32-1 to 32-n each supply a succession 36 of digital converters / analog (DAC) referenced from 36-1 to 36-n.
- DAC digital converters / analog
- each of these converters 36-1 to 36-n feed a circuit 37-1 to 37-n respectively.
- Each circuit 37-1 to 37-n is a circuit amplification and shaping which delivers or does not not deliver, depending on the signal received as input signal to activate the 4 or 4 'training device drops.
- Circuit 5 is made up of elements 32 to 37. It has at least as many outputs, one output from the circuit 5 being constituted by a circuit output amplification 37-1 to 37-n, as nozzles 2. It can include more, especially if it is of an integrated circuit adaptable to printers of different models, each model having its own number of nozzles 2.
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
- une gamme d'encre utilisable plus étendue et par conséquent une plus large variété de supports imprimables,
- une fréquence d'émission des gouttes plus élevée et donc une vitesse d'impression accrue (environ 100 kHz et quelques mètres par seconde contre environ 10 kHz et quelques centimètres par seconde),
- une distance d'impression de la face inférieure de la tête d'impression jusqu'au support supérieur (environ 15 mm contre 1 mm).
- de réalisation et de coût : la multiplication des circuits électroniques à haute tension reliés aux électrodes de charge et la multiplication de ces mêmes électrodes de charge induisent une commande électronique complexe et coûteuse,
- d'utilisation et de performance : la connectique haute tension très dense à proximité du jet provoque des diaphonies indésirables dont l'effet sur la qualité d'impression ne peut être limité que par une réduction du taux d'utilisation des gouttes, et par conséquent, une réduction de la vitesse d'impression, et/ou une diminution de la résolution.
- une électrode, adéquatement synchronisée avec l'actuateur de stimulation, est activée lors du détachement de chacune des gouttes à trier et induit sur celles-ci une quantité de charge électrique. Il est important de noter que la stabilité et la répétabilité du processus de charge nécessite un séquencement précis lors de la formation d'une goutte : le détachement du tronçon situé en aval de la goutte doit précéder celui du tronçon situé en amont de la goutte ;
- le passage du jet de fluide à travers un champ électrique constant permet ensuite de différencier la trajectoire des gouttes, qui subissent une déflexion, de celle des tronçons de fluide non utilisés.
- une buse d'impression émettant un jet d'encre sous pression selon un axe de la buse,
- un moyen de formation de gouttes d'encre agissant sur le jet émis par la buse par brisure du jet à une distance axiale prédéterminée de la buse,
- des moyens de récupération de l'encre qui n'est pas reçue par un substrat d'impression,
- une mémoire de stockage de données numériques, représentant ensemble un motif à imprimer,
- des moyens de contrôle de l'impression ayant une entrée et une sortie, ladite entrée étant couplée à la mémoire de stockage pour recevoir de façon séquentielle une partie au moins des données numériques représentant ensemble un motif à imprimer,
- on met en pression le liquide conducteur pour former au moins un jet dans une direction axiale ;
- on brise chacun des jets en des points de brisure de jet, les points de brisure définissant ensemble une zone de formation des gouttes, cette zone étant fixe dans l'espace et dans le temps et axée sur une droite DB perpendiculaire aux jets ;
- on défléchit une partie du liquide conducteur de chaque jet dans une direction différente de la direction axiale ;
- une région protégée dont la différence de potentiel électrique par rapport au potentiel de référence est nul ou négligeable, cette région englobant la zone de création des gouttes ;
- au moins une région dont la différence de potentiel par rapport au potentiel de référence n'est pas négligeable, au moins l'une desdites régions étant immédiatement en aval de ladite région protégée ;
- au moins une région qui, en présence du jet, est le siège d'un champ électrique propre à défléchir les tronçons.
- on émet au moins un jet continu d'encre conductrice,
- on brise chacun des jets pour former des gouttes d'encre en des lieux de création de gouttes prédéterminés, les lieux définissant ensemble une zone axée sur une droite (DB) sécante sensiblement perpendiculairement à chacun des jets,
- on défléchit une partie de l'encre de chaque jet de façon à ce que cette partie d'encre défléchie n'atteigne pas le substrat,
- au moins une région de cet espace par rapport au potentiel de référence est à un potentiel négligeable ou nul et au moins une région de potentiel non négligeable est située en aval de cette région de potentiel négligeable ou nul.
Claims (12)
- Imprimante (100) à jet d'encre (3) comprenant une buse (2) d'impression émettant un jet d'encre (3) sous pression selon un axe de la buse,des moyens (4, 4') de formation de gouttes d'encre agissant sur le jet (3) émis par la buse (2) par brisure du jet à une distance axiale prédéterminée de la buse,des moyens (11, 12) de récupération de l'encre qui n'est pas reçue par un substrat (14) d'impression,une mémoire (31) de stockage de données numériques représentant ensemble un motif à imprimer,des moyens (5, 32-37) de contrôle de l'impression ayant une entrée et une sortie, ladite entrée étant couplée à la mémoire (31) de stockage pour recevoir de façon séquentielle une partie au moins des données numériques représentant ensemble un motif à imprimer,
- Imprimante (100) selon la revendication 1, caractérisée en ce qu'elle comporte :des buses (2) additionnelles d'impression,des moyens additionnels (4, 4') de formation de gouttes d'encre, chaque moyen additionnel (4, 4') agissant sur le jet (3) d'une buse (2) additionnelle par brisure du jet (3) en un point situé à une distance axiale prédéterminée de ladite buse additionnelle, l'ensemble des points de brisure du jet formant une zone (DB) de brisure,les moyens (5, 32-37) de contrôle de l'impression comportent des sorties additionnelles, chaque sortie additionnelle étant couplée à l'un des moyens additionnels (4, 4') de formation de gouttes et,le groupe (7) d'électrodes (26) déviant les tronçons vers les moyens (11, 12) de récupération de l'encre est commun à l'ensemble des jets (3).
- Imprimante (100) selon l'une des revendications 1 ou 2, caractérisée en ce qu'elle comporte en outre un groupe (6) d'électrodes (21, 22, 25) de protection électrique du point ou de la zone de formation des gouttes, ce groupe (6) étant situé en aval de la buse ou des buses (2) et en amont du groupe (7) de déflexion des tronçons (10), les électrodes (15-20) de ce groupe (6) étant communes à l'ensemble des jets (3).
- Imprimante (100) selon la revendication 3, caractérisée en ce que le groupe (6) d'électrodes de protection électrique comporte une électrode (25) centrale en forme de U ayant deux branches (15,16) ou une paire (25) centrale d'électrodes (15, 16) comportant une première (15) et une seconde (16) électrodes, ces branches (15,16) ou électrodes (15, 16) étant couplées à une même première source de potentiel et en ce que la première (15) et la seconde (16) branches ou électrodes de l'électrode ou de la paire centrale (25) de protection sont disposées de part et d'autre de l'axe ou de l'ensemble des axes des buses.
- Imprimante (100) selon la revendication 3, caractérisée en ce que le groupe (6) d'électrodes de protection électrique du point ou de la zone de formation des gouttes comportent une électrode (21) ayant deux branches ou une paire amont (21) et une électrode aval ayant deux branches ou une paire aval (22), l'électrode ou la paire amont (21) comportant une première (17) et une seconde (18) branches ou électrodes, l'électrode ou la paire aval (22) comportant une première (19) et une seconde (20) branches ou électrodes, les branches ou électrodes (17, 19 ; 18, 20) amont (21) et aval (22) étant disposées de part et d'autre de l'axe ou de l'ensemble des axes de buse (2), un bord amont de l'électrode ou de la paire amont (21) étant situé à une distance axiale de l'une des buses (2) inférieure à ladite distance prédéterminée, un bord aval de l'électrode ou de la paire aval (22) étant situé à une distance axiale de cette buse (2) supérieure à ladite distance prédéterminée.
- Imprimante (100) selon la revendication 5, caractérisée en ce que le groupe (6) d'électrodes de protection électrique comporte en outre une électrode (25) ayant deux branches (15,16) ou une paire centrale (25) d'électrodes (15, 16), les branches ou électrodes (15, 16) de cette paire centrale (25) étant situées de part et d'autre de l'axe ou de l'ensemble des axes des buses (2), l'électrode ou la paire amont (21) étant en amont de l'électrode ou la paire centrale et l'électrode ou la paire aval (22) étant en aval de la paire centrale (25).
- Imprimante (100) selon l'une quelconque des revendications 3 à 6, caractérisée en ce qu'elle comporte en outre un groupe (30) d'électrodes de charges commun à l'ensemble des jets (3) placé en aval du groupe (6) d'électrodes de protection et en amont du groupe (7) d'électrodes de déflexion.
- Imprimante (100) selon l'une des revendications 1 à 7, caractérisée en ce que les moyens (4, 4') de formation de gouttes d'encre sont constitués par des éléments thermorésistifs ou piézo-électriques (4) placés en amont des buses (2).
- Imprimante (100) selon l'une des revendications 1 à 7, caractérisée en ce que les moyens de formation des gouttes d'encre sont constitués par des électrodes formant un dispositif électro-hydrodynamique placé à proximité des jets d'encre (3) en aval des buses (2).
- Procédé de projection d'un liquide conducteur maintenu à un potentiel électrique de référence dans lequel :on met en pression le liquide conducteur pour former au moins un jet (3) dans une direction axiale ;on brise chacun des jets (3) en des points de brisure de jet, les points de brisure définissant ensemble une zone de formation des gouttes, cette zone étant fixe dans l'espace et dans le temps et axée sur une droite DB perpendiculaire aux jets ;on défléchit une partie du liquide conducteur de chaque jet dans une direction différente de la direction axiale ;
- Procédé selon la revendication 10, caractérisé en ce que pour une pluralité de jets dont les axes sont parallèles et contenus dans un même plan P,ont défléchit la trajectoire des tronçons (10) de liquide conducteur sans défléchir la trajectoire des gouttes (13) en créant des régions contenant le plan P des directions axiales dont les caractéristiques électriques, en l'absence de jet, sont permanentes dans le temps, ces régions comprenant :une région protégée dont la différence de potentiel électrique par rapport au potentiel de référence est nul ou négligeable, cette région englobant la zone de création des gouttes ;au moins une région dont la différence de potentiel par rapport au potentiel de référence n'est pas négligeable, au moins l'une desdites régions étant immédiatement en aval de ladite région protégée ;au moins une région qui, en présence du jet, est le siège d'un champ électrique propre à défléchir les tronçons.
- Procédé de projection selon l'une des revendications 10 ou 11, caractérisé en ce que le liquide conducteur est une encre, les informations extérieures commandant le séquencement des créations de gouttes sont constituées par des données numériques représentant ensemble un motif à imprimer sur un substrat (14), et en ce que les tronçons n'atteignent pas le substrat.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9912881 | 1999-10-15 | ||
FR9912881A FR2799688B1 (fr) | 1999-10-15 | 1999-10-15 | Imprimante et procede d'impression par jets d'encre |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1092542A1 true EP1092542A1 (fr) | 2001-04-18 |
EP1092542B1 EP1092542B1 (fr) | 2006-01-04 |
Family
ID=9550977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000402817 Expired - Lifetime EP1092542B1 (fr) | 1999-10-15 | 2000-10-12 | Imprimante et procédé d'impression par jets d'encre |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1092542B1 (fr) |
CN (1) | CN1170677C (fr) |
DE (1) | DE60025320T2 (fr) |
ES (1) | ES2254117T3 (fr) |
FR (1) | FR2799688B1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2851495A1 (fr) * | 2003-02-25 | 2004-08-27 | Imaje Sa | Imprimante a jet d'encre |
FR2890596A1 (fr) | 2005-09-13 | 2007-03-16 | Imaje Sa Sa | Dispositif de charge et deflexion de gouttes pour impression a jet d'encre |
WO2007042530A1 (fr) * | 2005-10-13 | 2007-04-19 | Imaje S.A. | Impression par déviation différentielle du jet d’encre |
US8162450B2 (en) | 2006-10-05 | 2012-04-24 | Markem-Imaje | Printing by deflecting an ink jet through a variable field |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2447919B (en) * | 2007-03-27 | 2012-04-04 | Linx Printing Tech | Ink jet printing |
CN105112965B (zh) * | 2015-09-16 | 2017-08-08 | 上海圣匡机电科技有限公司 | 金属件快速成型用打印头、打印装置和打印方法 |
CN105398218A (zh) * | 2015-12-14 | 2016-03-16 | 上海美创力罗特维尔电子机械科技有限公司 | 一种喷码机喷印系统 |
CN105584218A (zh) * | 2016-02-01 | 2016-05-18 | 厦门英杰华机电科技有限公司 | 平行双嘴cij喷码系统 |
CN106739506B (zh) * | 2016-12-12 | 2018-07-24 | 华中科技大学 | 一种用于电流体喷印的压电式集成喷头 |
GB201706562D0 (en) * | 2017-04-25 | 2017-06-07 | Videojet Technologies Inc | Charge electrode |
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US3596275A (en) | 1964-03-25 | 1971-07-27 | Richard G Sweet | Fluid droplet recorder |
US4220958A (en) | 1978-12-21 | 1980-09-02 | Xerox Corporation | Ink jet electrohydrodynamic exciter |
US4230558A (en) | 1978-10-02 | 1980-10-28 | Coulter Electronics, Inc. | Single drop separator |
JPS57201668A (en) * | 1981-06-08 | 1982-12-10 | Fuji Xerox Co Ltd | Charge control type ink jet printer |
US4638328A (en) | 1986-05-01 | 1987-01-20 | Xerox Corporation | Printhead for an ink jet printer |
US4638326A (en) * | 1985-03-04 | 1987-01-20 | Hitachi, Ltd. | Ink jet recording apparatus |
EP0949077A1 (fr) * | 1998-04-10 | 1999-10-13 | TOXOT Science & Applications | Procédé de projection d'un liquide électriquement conducteur et dispositif d'impression par jet d'encre continu utilisant ce procédé |
-
1999
- 1999-10-15 FR FR9912881A patent/FR2799688B1/fr not_active Expired - Fee Related
-
2000
- 2000-10-12 EP EP20000402817 patent/EP1092542B1/fr not_active Expired - Lifetime
- 2000-10-12 DE DE2000625320 patent/DE60025320T2/de not_active Expired - Lifetime
- 2000-10-12 ES ES00402817T patent/ES2254117T3/es not_active Expired - Lifetime
- 2000-10-15 CN CNB001285947A patent/CN1170677C/zh not_active Expired - Fee Related
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US3596275A (en) | 1964-03-25 | 1971-07-27 | Richard G Sweet | Fluid droplet recorder |
US4230558A (en) | 1978-10-02 | 1980-10-28 | Coulter Electronics, Inc. | Single drop separator |
US4220958A (en) | 1978-12-21 | 1980-09-02 | Xerox Corporation | Ink jet electrohydrodynamic exciter |
JPS57201668A (en) * | 1981-06-08 | 1982-12-10 | Fuji Xerox Co Ltd | Charge control type ink jet printer |
US4638326A (en) * | 1985-03-04 | 1987-01-20 | Hitachi, Ltd. | Ink jet recording apparatus |
US4638328A (en) | 1986-05-01 | 1987-01-20 | Xerox Corporation | Printhead for an ink jet printer |
EP0949077A1 (fr) * | 1998-04-10 | 1999-10-13 | TOXOT Science & Applications | Procédé de projection d'un liquide électriquement conducteur et dispositif d'impression par jet d'encre continu utilisant ce procédé |
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DRAKE D J: "BINARY CONTINUOUS THERMAL INK JET BREAK OFF LENGTH MODULATION", XEROX DISCLOSURE JOURNAL,US,XEROX CORPORATION. STAMFORD, CONN, vol. 14, no. 3, 1 May 1989 (1989-05-01), pages 95 - 100, XP000027460 * |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2851495A1 (fr) * | 2003-02-25 | 2004-08-27 | Imaje Sa | Imprimante a jet d'encre |
WO2005070676A2 (fr) * | 2003-02-25 | 2005-08-04 | Imaje Sa | Imprimante a jet d’encre continu |
WO2005070676A3 (fr) * | 2003-02-25 | 2005-12-22 | Imaje Sa | Imprimante a jet d’encre continu |
US7192121B2 (en) | 2003-02-25 | 2007-03-20 | Imaje Sa | Inkjet printer |
FR2890596A1 (fr) | 2005-09-13 | 2007-03-16 | Imaje Sa Sa | Dispositif de charge et deflexion de gouttes pour impression a jet d'encre |
WO2007031500A1 (fr) | 2005-09-13 | 2007-03-22 | Imaje S.A. | Dispositif de chargement et de deviation de gouttelettes pour impression a jet d'encre |
US7712879B2 (en) | 2005-09-13 | 2010-05-11 | Imaje S.A. | Drop charge and deflection device for ink jet printing |
WO2007042530A1 (fr) * | 2005-10-13 | 2007-04-19 | Imaje S.A. | Impression par déviation différentielle du jet d’encre |
FR2892052A1 (fr) * | 2005-10-13 | 2007-04-20 | Imaje Sa Sa | Impression par deflexion differentielle de jet d'encre |
US8104879B2 (en) | 2005-10-13 | 2012-01-31 | Imaje S.A. | Printing by differential ink jet deflection |
US8162450B2 (en) | 2006-10-05 | 2012-04-24 | Markem-Imaje | Printing by deflecting an ink jet through a variable field |
Also Published As
Publication number | Publication date |
---|---|
DE60025320D1 (de) | 2006-03-30 |
FR2799688B1 (fr) | 2001-11-30 |
FR2799688A1 (fr) | 2001-04-20 |
DE60025320T2 (de) | 2006-08-31 |
ES2254117T3 (es) | 2006-06-16 |
CN1170677C (zh) | 2004-10-13 |
EP1092542B1 (fr) | 2006-01-04 |
CN1293111A (zh) | 2001-05-02 |
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