EP3086945B1 - Imprimante à jet d'encre et procédé permettant de faire fonctionner une imprimante à jet d'encre - Google Patents

Imprimante à jet d'encre et procédé permettant de faire fonctionner une imprimante à jet d'encre Download PDF

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EP3086945B1
EP3086945B1 EP14835624.9A EP14835624A EP3086945B1 EP 3086945 B1 EP3086945 B1 EP 3086945B1 EP 14835624 A EP14835624 A EP 14835624A EP 3086945 B1 EP3086945 B1 EP 3086945B1
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Prior art keywords
ink
color
printing
drops
lighter
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German (de)
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EP3086945A2 (fr
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Jan Franck
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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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • 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
    • B41J2/205—Ink jet for printing a discrete number of tones
    • B41J2/2054—Ink jet for printing a discrete number of tones by the variation of dot disposition or characteristics, e.g. dot number density, dot shape
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • 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
    • B41J2/205—Ink jet for printing a discrete number of tones
    • B41J2/2056—Ink jet for printing a discrete number of tones by ink density change
    • B41J2002/2058—Ink jet for printing a discrete number of tones by ink density change selecting different ink densities from one colour
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/06—Heads merging droplets coming from the same nozzle

Definitions

  • the invention is directed to a method for operating an inkjet printer so that image files with a predetermined color depth of b bpc (bits per color), bc N, can thereby be printed out, the color depth signals specified in an image file from the data there, if applicable used system of colors F 1 , F 2 , F 3 , for example red, green, blue, in color depth signals of the available printing inks D 1 , D 2 , D 3 , etc., for example.
  • thermal sublimation printers or photo printers have a resolution of 300 dpi and, for example, 255 different color intensities per pixel. This allows very good image quality to be created, with no rastering to be seen. This results from the fact that a dye with a waxy texture is used in thermal sublimation printing. High temperatures of about 300 ° C or above turn the wax into a gaseous state and it can be vapor-deposited. In practice, individual areas of a printhead are heated to evaporate dyes in places from a carrier film then be transferred to the paper. The amount of the dye to be transferred can be specified on the basis of the temperature, and the brightness or color intensity of the pixel in question can thus be varied.
  • ink printers or ink jet printers for example with piezo print heads
  • the pressure is controlled either by individual electrostatic charging of a continuous ink jet, which can then be deflected in a field depending on its electrical charge (continuous inkjet process, CIJ), or by the delivery of individual drops as required (drop-on-demand -Procedure, DOD).
  • CIJ continuous inkjet process
  • DOD drop-on-demand -Procedure
  • printers usually only master 2 or 3 different color intensities per printing ink. While this is barely noticeable, especially when printing text or other black and white documents with a strong contrast between light and dark, inkjet printers are less suitable for printing color photos.
  • a generic method is in EP 1 312 653 A1 or for example in the document EP 0 899 937 A2 disclosed.
  • Inks with gray levels 0, 80, 130 and 255 are used, with only inks with gray levels 0 and 80 being used proportionally in a color intensity interval between 0 and 80, inks with gray levels 80 and 130 in a color intensity interval between 81 and 130 used, etc.
  • an ink with a color intensity of 130 is more intense by a factor of 1.625 than an ink with a color intensity of 80, so that the assignment of suitable droplet quantities proves to be complex.
  • the individual ink droplets Due to the high frequency of the ink drops and the fact that the drops of the same ink assigned to a pixel come from one and the same nozzle, the individual ink droplets do not tear away from one another, but remain together during their flight through the air through a thin strand of ink connected. As a result of the surface tension or internal tension of such an ink strand, the individual drops strive to contract and merge as they fly through the air. They therefore hit the print substrate as a single large drop.
  • inks with an odd multiple of the color intensity also entails a greater computational effort, or even prevents an exact, photo-realistic image resolution.
  • the printing process according to the invention on the one hand significantly reduces the computational effort and on the other hand considerably increases the color depth and image quality.
  • the control electronics for a printer according to the invention can be implemented much more simply and cheaply than in the prior art.
  • the negative color intensity J f, ⁇ ⁇ 0 can be set, for example, with the drop size of the printing device, if necessary also by adding a brightening, milky to white substance or a white dye.
  • n N, n ⁇ 2 0 with n N, n ⁇ 2; and two printing devices are provided, one of which is fed from the ink reservoir for the lighter ink, the other, however, from the ink reservoir for the darker ink.
  • a single nozzle is sufficient for each pixel and printing ink and ink brightness, instead of, for example, 16 previously.
  • CIJ printers Since the type of delivery of the individual ink drops is not important in the context of the invention, a distinction between CIJ printers and DOD printers is not necessary. Both types of printers can be operated according to the principle according to the invention.
  • the invention further comprises a data splitter which supplies the higher-order, maximum (b-x) bits of the color depth signal of a pixel to the printing device for the darker ink, and the lower-order x bits of the color depth signal of the same pixel to the printing device for the lighter ink. Due to the brightness setting of the various inks according to the invention, this data splitter can be constructed extremely simply.
  • the entire data word or byte can simply be transferred to a register and then overwritten with zeros on the (b - x) higher order bits in order to make the remaining lower order bits available to the printing device for the lighter ink.
  • a dual number is finally obtained, aligned right within the relevant register or data word or data byte, which can be interpreted directly as the desired number of drops of the relevant - lighter - ink to be dispensed.
  • the higher-order bits can then preferably be shifted to the right by x places, so that one finally finds - aligned right-justified within the relevant register or data word or byte - a dual number which is immediately output as the desired number of drops to be dispensed from the - darker - Ink can be interpreted.
  • a delay module which is only connected to one output of the splitter and not to the other, offers further advantages. It can thereby be achieved that all print signals relating to both inks for one color and one pixel are calculated at a single point in time, for example when the front printing device, viewed in the printing direction, is to print on a pixel; the respective other printing device for the same-colored ink with a different brightness, however, only reaches this pixel at a later point in time, so that the printing signal associated with that pixel and that ink must be buffered.
  • the invention is further characterized by color depth registers for writing in the bits of the color depth signal of a pixel assigned to a printing device.
  • a printing device usually prints a plurality of pixels simultaneously, which are then arranged in particular in a row which runs transversely to the feed direction of the paper or substrate or of the print head.
  • the color depth register expands to a kind of register vector with a corresponding number of registers, so that an individual register is assigned to each nozzle or pixel.
  • the split and in the color depth registers inscribed partial values of the original color depth signal are used directly or directly, namely as a number for the drops of the respective ink to be dispensed.
  • the corrected partial color intensities D d, ⁇ and D f, ⁇ now have opposite signs in the overall color intensity, as is also the case due to the negative or virtually negative color intensity of a colorless ink in contrast to a dark, intensely colored one Ink is the case, ie these corrected color values can be used immediately to deliver a corresponding number of drops of the ink in question.
  • each module per pixel or nozzle each of which generates a pressure pulse within a predetermined time grid, as long as the value in the color depth register assigned to a pixel or nozzle is greater than zero.
  • the time grid for this can be derived, for example, from a pulse train generated internally in the device.
  • a further module which decrements the value stored in a color depth register by one after a print pulse has been generated. For example, if the value previously stored in the register was a 1, it is now reduced to 0 and, consequently, no further pressure pulse is given on the following pulse of the specified time grid. If, on the other hand, the value stored in the color depth register was greater than 1, for example 7, it is only reduced to the value 6 and subsequently a further pressure pulse is generated, etc., until the value has actually been decremented to 0.
  • Such an arrangement leads to the fact that each time as many pressure pulses are emitted in immediate succession as in the dual number specified in the x or (b - x) bits of the color depth register.
  • the principle according to the invention can be extended to three, four or even more inks per color, each of which differs from one another in their color intensity or brightness, preferably by 2 x1 , 2 x2 , 2 x3 , etc., with x 1 N, x 2 N, x 3 N; x 1 ⁇ 1, x 2 ⁇ 1, x 3 ⁇ 1.
  • the invention further allows further development in that the individual ink drops of the same color and the same brightness to be printed one above the other are emitted in such a rapid sequence that a previous drop has not yet completely detached from the printing device if the following color drop per pixel has already occurred is released so that the ink drops do not separate from each other.
  • This allows the drop size to be influenced, so to speak, several smaller drops are "pumped" into a larger drop in order to enlarge it accordingly. It has been shown that the amount of ink dispensed per (small) drop does not or hardly vary, so that the drop size and thus the amount of dye can be controlled proportionally or linearly with good approximation.
  • part of the information of a partial color value for example its two least significant bits, can be transmitted directly to the printing device in order to allow these least significant bits of a partial color intensity value to flow into the correct drop size .
  • the higher-order bits of a partial color intensity value can then be taken into account by repeatedly dispensing drops in rapid succession.
  • the specification of individual drop sizes leads to a significant reduction in the total number of small individual drops to be dispensed, for example with a partial color intensity value of 4 bits from 15 to approximately 6, that is to say to less than half.
  • Fig. 2 The representation after Fig. 2 is based on the example of the so-called "true color" format, the one in the context of a single Color information stored in an image file or pixel has a size of 24 bits, corresponding to 24 bpp (bits per pixel).
  • RGB color values which are often used in image files, are not compatible with the printing inks cyan (C), magenta (M) and yellow (Y) and possibly black.
  • the image data are first converted into a printing format suitable for the printing inks used, for example into the CMYK coefficients, where K stands for key and represents an additional computing variable.
  • C : C 0 - K 0 .
  • M : M 0 - K 0 .
  • Y : Y 0 - K 0 ,
  • the printing device 1 consists of two print heads 2, 3, which can be constructed in the same way; of course, the two print heads 2, 3 can also be combined with one another to form a structural unit. However, each print head 2, 3 is fed with a different ink T h, ⁇ T d, ⁇ , which are provided in two ink reservoirs 4, 5.
  • the two inks T h, ⁇ T d, ⁇ each contain exactly the same printing ink D ⁇ , but in a different color intensity J h, ⁇ , J d, ⁇ ;
  • the lighter ink T h, ⁇ has a lower color intensity J h, ⁇
  • the darker ink T d, ⁇ has a higher color intensity J d, ⁇ .
  • the two inks T h, ⁇ , T d, ⁇ remain strictly separated; the lighter ink T h, ⁇ passes through a first ink line 6 from the first ink reservoir 4 to the first print head 2, while the darker ink T d, ⁇ flows through a second ink line 7 from the second ink reservoir 5 to the second print head 3.
  • the representation of the print heads 2, 3 should be understood as a bottom view. Two rows of individual nozzles 8, 9, 10, 11 can be seen there, the individual nozzles 8, 9, 10, 11 of the two rows of a printhead 2, 3 each being offset by approximately half a nozzle spacing, so that, for example Nozzles 9, 11 of the second (in Fig. 1 each lower) row exactly between the nozzles 8, 10 of the first (in Fig. 1 print the top row in each case.
  • the rows of nozzles 8 to 11 extend transversely to the feed direction 12 of the paper or to the relative direction of movement of the printing device 1 with respect to the substrate to be printed.
  • the two print heads 2, 3 are aligned such that each nozzle 10, 11 of the second print head 3 lies exactly behind a nozzle 8, 9 of the first print head 2 in the feed direction 12.
  • each nozzle 8, 9 of the first print head there is exactly one assigned nozzle 10, 11 of the second print head 3, and the center points of two pairs of nozzles 8, 10 and 9, 11, which are assigned to one another in this way, are each connected by a line connected, which is parallel to the feed direction 12 and has the same length for all nozzle pairs 8, 10 or 9, 11, corresponding to the offset d between the two printing devices 2, 3.
  • ⁇ d / v
  • x is a positive integer, preferably x> 2. So the factor 2 x assume depending on the selected x only certain values, namely 4, 8, 16, 32, etc.
  • the dye in the ink T h, ⁇ is at a concentration c h, ⁇ of 0.5% by weight
  • the invention recommends using the same compositions for the remaining components of the two inks T h, ⁇ , T d, ⁇ .
  • the inks T h, ⁇ , T d, ⁇ should also be stored in closed containers 4, 5, if possible, so that the solvent cannot evaporate and the concentration of the dye can change in an uncontrolled manner.
  • a pressure equalization opening could also be closed with a spring-loaded check valve, which only opens briefly when there is an internal negative pressure in order to let in air, but otherwise keeps the container closed, while a lid can be opened, for example unscrewed, for refilling the container.
  • the x least significant bits in each case are extracted from a color value 13, 14, 15 and assigned to the print head 2, 3 for the lighter ink T h, ⁇ , then the respectively higher order bits are extracted and the print head 2, 3 for the darker one Ink T h, ⁇ assigned.
  • the color portion 20, 21 assigned to an ink - in the present example with a length of 4 bits - can be queried whether this value 20, 21 is greater than zero.
  • this query 22, 23 shows that the respective color component 20, 21 is equal to or greater than 1, then in a subsequent method step 24, 25 the relevant printing device 2, 3, that is to say the relevant ink T h, ⁇ , T d, ⁇ assigned printing device 2, 3, causes a drop of the ink T h, ⁇ , T d, ⁇ to be emitted. Then the color component 20, 21 in question - for example the value C d for dark cyan or the value C h for light cyan or the value M d for dark magenta or the value M h for light magenta or the value Y d for dark yellow or the value Y h for light yellow - decremented by the value 1.
  • the query 22, 23 is then repeated, and only if the new color value 20, 21 is still equal to or greater than 1 is a drop of the relevant ink again printed. This leads to the fact that only as many drops of an ink are set per pixel as the dual number originally stored in the assigned color value 20, 21 or C d , C h , M d , M h , Y d , Y h .
  • the dual number 1011 corresponds to the decimal number 11
  • the drops of an ink of a predetermined color and intensity are dispensed from one and the same nozzle 8, 9, 10, 11, in rapid succession.
  • This clock is preferably generated in the printing device itself and depends on the resolution, the feed and the number of inks of one color. In any case, this cycle should be so high that the drops emitted by a single nozzle do not tear off from one another, but remain connected during the flight to the substrate to be printed or bond even more so that a single "on the substrate to be printed” Super drop "arrives and creates only a single ink spot, without internal structures, which prevents the formation of macroscopically recognizable (moiree) patterns even in areas of the same color.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Color, Gradation (AREA)
  • Color Image Communication Systems (AREA)

Claims (17)

  1. Procédé permettant de faire fonctionner une imprimante à jet d'encre de façon à ce que des fichiers image d'une profondeur de couleur prédéfinie de b bpc, b
    Figure imgb0075
    N, puissent être imprimés, en ce que le cas échéant les signaux de profondeur de couleur indiqués dans un fichier image du système de couleurs F1, F2, F3 qui y est utilisé, par exemple rouge, vert, bleu, dans des signaux de profondeur de couleur des encres d'impression disponibles D1, D2, D3, etc., par exemple cyan, magenta, jaune ainsi que, le cas échéant, noir, et/ou d'autres couleurs sont convertis de telle sorte que la résolution de b bpc utilisée pour la profondeur de couleur est maintenue dans le signal de profondeur de couleur relatif aux encres d'impression Dµ, en ce que pour une ou plusieurs, en particulier pour toutes les encres d'impression Dµ respectivement au moins deux encres Th,µ, Td,u de même couleur Dµ mais de différente intensité de couleur sont utilisées, à savoir une encre Th,µ plus claire d'une intensité de couleur claire Jh,µ > 0 ou voire une encre incolore, éclaircissante Tf,µ d'une intensité de couleur éclaircissante virtuelle Jf,µ < 0 et au moins une encre plus foncée Td,µ d'une intensité de couleur foncée Jd,µ, en ce que : J d , μ − n * J h , μ = 0
    Figure imgb0076
     ou : J d , μ + n * J f , μ = 0
    Figure imgb0077
     avec n
    Figure imgb0078
    N ≥ 2 ; et µ = 1, 2, 3 ... ;
    et en ce que sur la surface attribuée à un pixel plusieurs gouttes de la même encre Td,µ, Th,µ, Tf,µ peuvent être imprimées, à savoir au maximum (n - 1) gouttes d'encre de l'encre plus claire ou incolore Th,µ, Tf,µ et au maximum (m - 1) gouttes d'encre de l'encre plus foncée Td,µ afin que m niveaux de clarté puissent être obtenus avec l'encre plus foncée Td,µ, à savoir 0 ...(m * Jd,µ), et n niveaux de clarté avec l'encre plus claire Th,µ, à savoir 0 ... (n * Jh,µ), ce qui permet d'obtenir au total au moins (n * m) différents niveaux de clarté, à savoir 0 ... [(m - 1) * Jd,µ + (n - 1) * Jh,µ)], caractérisé en ce que n
    Figure imgb0079
    N, n = 2x, de sorte que : J d , μ − 2 x * J h , μ = 0
    Figure imgb0080
     ou : J d , μ + 2 x * J f , μ = 0
    Figure imgb0081
     en ce que x
    Figure imgb0082
    N, x ≥ 2, par exemple 2, 3 ou 4 ; 2x étant dans ces cas alors 22 = 4, ou 23 = 8, ou 24 = 16, et en ce que les signaux de commande pour un dispositif d'impression Eh,µ pour une encre plus claire ou incolore Th,µ sont obtenus à partir de x bits d'ordre inférieur du signal de profondeur de couleur relatif aux encres d'impression utilisées Dµ de telle sorte qu'un nombre de gouttes, dépendant de la valeur du nombre binaire dans les x bits d'ordre inférieur, de l'encre plus claire ou incolore Th,µ, Tf,µ est tiré successivement à intervalles rapprochés, et en ce que les signaux de commande pour un dispositif d'impression Ed,µ pour l'encre plus foncée Td,µ sont obtenus à partir de maximum (b - x) bits d'ordre supérieur du signal de profondeur de couleur relatif aux encres d'impression Dµ, tandis qu'un nombre de gouttes correspondant au nombre binaire au maximum dans les (b - x) bits d'ordre supérieur de l'encre plus foncée Td,µ est tiré successivement à intervalles rapprochés, toutefois temporisé d'un intervalle de temps +T, -T correspondant à la distance physique +d, -d des deux dispositifs d'impression Eh,µ, Ed,µ dans le sens de transport du substrat, de sorte que les gouttes d'encre de la même encre Td,u, Th,µ, Tf,µ ou de la même encre d'impression Dµ sont imprimées directement les unes au-dessus des autres.
  2. Procédé selon la revendication 1, caractérisé en ce que n = m, de sorte qu'il en résulte au total (n * n) = n2 ≥ 2b différents niveaux de clarté, à savoir 0 ... [(n - 1) * Jd,µ + Jh,µ)].
  3. Procédé selon la revendication 2, caractérisé en ce que b est d'ordre pair, donc b = 2 * x avec x
    Figure imgb0083
    N, x ≥ 1, de sorte qu'il en résulte avec les deux encres en commun au total n2 = 22x différentes profondeurs de couleurs ou niveaux de clarté, à savoir 0 ... [(n - 1) * (Jd,µ + Jh,µ)].
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que jusqu'à (2x - 1) gouttes de la même encre peuvent être imprimées les unes au-dessus des autres sur un pixel, afin que 2x niveaux de clarté puissent être obtenus avec l'encre plus foncée, à savoir 0 ... (2x - 1) * Jd,µ, et également 2x différents niveaux de clarté avec l'encre plus claire, à savoir 0 ... (2x - 1) * Jh,µ, ce qui permet d'obtenir au total 2x * 2x = 22x différents niveaux de clarté, à savoir 0 ... (2x - 1) * (Jd,µ + Jh,µ).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que les différentes intensités de couleurs ou niveaux de clarté diffèrent par le fait que les concentrations Ch,µ, Cd,µ du colorant dans l'encre satisfont à l'équation suivante : C d , μ = n * C h , μ
    Figure imgb0084
     ou C d , μ = 2 x * C h , μ .
    Figure imgb0085
  6. Procédé selon la revendication 5, caractérisé en ce que le colorant dans l'encre plus foncée correspond chimiquement au colorant dans l'encre plus claire.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que deux dispositifs d'impression sont commandés de manière temporisée d'un intervalle de temps T pour l'impression d'encres de même couleur, mais de différente profondeur de couleur ou de clarté, en ce que de préférence : T = d / v ,
    Figure imgb0086
     avec
    v = vitesse de transport relative du substrat à imprimer par rapport au dispositif d'impression.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le volume d'une goutte est compris entre 0,5 pl et 20 pl, par exemple entre 1 pl et 10 pl, de préférence entre 2 pl et 8 pl, en particulier entre 4 pl et 6 pl.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que pour la production d'une tache d'encre correspondant à l'information image pour un pixel sur le substrat par passage d'impression et encre d'impression au total uniquement un nombre d'orifices de buse correspondant aux intensités de couleur disponibles de cette encre d'impression sont utilisés dont un se trouve sur le dispositif d'impression pour une encre plus foncée, un autre sur le dispositif d'impression pour une encre plus claire.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que pour la production d'une tache d'encre correspondant à l'information image pour un pixel sur le substrat les différentes gouttes d'encre de même couleur et de même clarté sont tirées successivement à intervalles rapprochés.
  11. Procédé selon la revendication 10, caractérisé en ce que les différentes gouttes d'encre de même couleur et de même clarté tirées successivement à intervalles rapprochés sont délivrées en succession, rapide de telle sorte qu'elles se rejoignent pendant leur trajet et né produisent sur le substrat d'impression qu'une seule goutte d'encre par pixel.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que les différentes gouttes d'encre de même couleur et de même clarté tirées successivement à intervalles rapprochés sont délivrées en succession rapide de telle sorte qu'une goutte précédente ne s'est pas complètement détachée du dispositif d'impression lorsque la goutte d'encre suivante par pixel est déjà délivrée de sorte que les gouttes d'encre ne se détachent pas du tout les unes des autres.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un dispositif d'impression est utilisé qui est en mesure de délivrer des gouttes d'encre de différentes grosseurs, par exemple codées par une valeur binaire.
  14. Imprimante à jet d'encre destiné à l'impression de fichiers image d'une profondeur de couleur prédéfinie de b bpc, b ∈ N, en qualité photo, en ce que pour une ou plusieurs, en particulier toutes les encres d'impression Dµ, donc par exemple cyan, magenta, jaune ainsi que, le cas échéant, noir,
    a) respectivement au moins deux réservoirs de stockage d'encre (4, 5) sont prévus pour différentes encres d'impression Td,µ, Th,µ, Tf,µ de même couleur Dµ, mais de différente intensité de couleur, à savoir au moins une encre plus claire Th,µ d'une intensité de couleur claire Jh,µ > 0 ou voire une encre incolore éclaircissante Tfµ d'une intensité de couleur éclaircissante virtuelle Jf,µ < 0 et au moins une encre plus foncée Td,µ d'une intensité de couleur foncée Jd,µ, en ce que : J d , μ − n * J h , μ = 0
    Figure imgb0087
     ou : J d , μ + n * J f , μ = 0
    Figure imgb0088
     avec n
    Figure imgb0089
    N ≥ 2 ; ainsi que
    b) respectivement au moins deux dispositifs d'impression (2, 3) sont prévus dont l'un est alimenté à partir du réservoir de stockage d'encre (5) pour l'encre plus foncée Td,µ, l'autre en revanche à partir du réservoir de stockage d'encre (4) pour l'encre plus claire ou incolore Td,µ, Tf,µ,
    caractérisée en ce que n = 2x, de sorte que s'applique : J d , μ − 2 x * J h , μ = 0
    Figure imgb0090
     ou : J d , μ + 2 x * J h , μ = 0
    Figure imgb0091
     en ce que x
    Figure imgb0092
    N, x ≥ 2, par exemple 2, 3 ou 4 ; 2x étant dans ces cas alors 22 = 4, ou 23 = 8, ou 24 = 16, et en ce que les signaux de commande pour un dispositif d'impression Eh,µ pour une encre plus claire ou incolore Th,µ sont obtenus à partir de x bits d'ordre inférieur du signal de profondeur de couleur relatif aux encres d'impression utilisées Dµ de telle sorte qu'un nombre de gouttes, dépendant de la valeur du nombre binaire dans les x bits d'ordre inférieur, de l'encre plus claire ou incolore Th,µ, Tf,µ est tiré successivement à intervalles rapprochés, et en ce que les signaux de commande pour un dispositif d'impression Ed,µ pour l'encre plus foncée Td,µ sont obtenus à partir de maximum (b - x) bits d'ordre supérieur du signal de profondeur de couleur relatif aux encres d'impression relatives aux encres d'impression Dµ, tandis qu'un nombre de gouttes, correspondant au nombre binaire au maximum dans les (b - x) bits d'ordre supérieur, de l'encre plus foncée Td,µ est tiré successivement à intervalles rapprochés, toutefois temporisé d'un intervalle de temps +T, -T correspondant à la distance physique +d, -d des deux dispositifs d'impression Eh,µ, Ed,µ dans le sens de transport du substrat, afin que les gouttes d'encre de la même encre Td,µ, Th,µ, Tf,µ ou de la même encre d'impression Dµ soient imprimées directement les unes au-dessus des autres, et en ce que respectivement un seul orifice de buse est prévu pour la production d'une tache d'encre correspondant à l'information image pour un pixel sur le substrat de chaque dispositif d'impression Eh,µ, Ed,µ.
  15. Imprimante à jet d'encre selon la revendication 14, caractérisée par un répartiteur de données qui transmet les bits d'ordre supérieur du signal de profondeur de couleur d'un pixel au dispositif d'impression pour l'encre plus foncée, en revanche les bits d'ordre inférieur du signal de profondeur de couleur de ce même pixel au dispositif d'impression pour l'encre plus claire.
  16. Imprimante à jet d'encre selon la revendication 15, caractérisée par un module de temporisation qui est monté en aval d'une sortie du répartiteur seulement, mais pas de l'autre.
  17. Imprimante à jet d'encre selon l'une des revendications 14 à 16, caractérisée par un registre de profondeur de couleur pour enregistrer les bits du signal de profondeur de couleur d'un pixel qui sont attribués à un dispositif d'impression (2, 3), en ce qu'un module peut être prévu, lequel génère dans une tranche de temps prédéfinie respectivement une impulsion d'impression tant que la valeur dans le registre de profondeur de couleur est supérieure à zéro, éventuellement ainsi qu'un autre module qui respectivement décrémente d'une unité la valeur enregistrée dans le registre de profondeur de couleur après génération d'une impulsion d'impression.
EP14835624.9A 2013-12-23 2014-12-23 Imprimante à jet d'encre et procédé permettant de faire fonctionner une imprimante à jet d'encre Active EP3086945B1 (fr)

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EP3086945A2 (fr) 2016-11-02
IL246125B (en) 2020-10-29
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CA2933766C (fr) 2021-01-26
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PT3086945T (pt) 2020-05-27
KR102236655B1 (ko) 2021-04-06
CA2933766A1 (fr) 2015-07-02
US20160325555A1 (en) 2016-11-10
AU2014372308A1 (en) 2016-06-30
JP6461191B2 (ja) 2019-01-30
CN105848916B (zh) 2018-10-30
KR20160102499A (ko) 2016-08-30
ES2792977T3 (es) 2020-11-12
WO2015097535A2 (fr) 2015-07-02
WO2015097535A3 (fr) 2015-08-20

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