EP0636485A1 - Method and apparatus for a dot printer - Google Patents

Method and apparatus for a dot printer Download PDF

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Publication number
EP0636485A1
EP0636485A1 EP94401538A EP94401538A EP0636485A1 EP 0636485 A1 EP0636485 A1 EP 0636485A1 EP 94401538 A EP94401538 A EP 94401538A EP 94401538 A EP94401538 A EP 94401538A EP 0636485 A1 EP0636485 A1 EP 0636485A1
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EP
European Patent Office
Prior art keywords
printing
document
displacement
resolution
print head
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.)
Withdrawn
Application number
EP94401538A
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German (de)
French (fr)
Inventor
Pascal Guiheneuf
Maurice Lemoine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks France SAS
Original Assignee
Matra Communication SA
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Publication date
Application filed by Matra Communication SA filed Critical Matra Communication SA
Publication of EP0636485A1 publication Critical patent/EP0636485A1/en
Withdrawn legal-status Critical Current

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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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/51—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements serial printer type

Definitions

  • the present invention relates to a method and a device for dot printing, which can be applied in particular to facsimile.
  • Dots printing devices comprising a dots printing head, for example an ink jet printing head mounted on a carriage associated with drive members for moving the carriage relative to a document according to two substantially perpendicular directions of movement.
  • a head of this type has a series of print nozzles arranged in a line or a matrix. The print nozzles are spaced from each other and are arranged so that a displacement of the print head in a first direction prints a strip formed of elementary dots emitted by the nozzles of the head which are controlled for printing.
  • the resolution of an ink jet print head is defined by the number of dots printed per unit of length according to the direction considered.
  • Successive bands of dots are produced sequentially by carrying out a relative displacement of the print head and the document in a second direction, for example by advancing the document in a direction perpendicular to the direction of movement of the carriage, the number of bands being determined to scan the desired format of the document.
  • the document advance in the second direction is calculated so that the successive bands are joined, that is to say that the document advance is equal to the product of the distance between nozzles taken in the direction of advance, by the number of nozzles included in the print head in this direction.
  • a slight overlap zone could be created between each printed strip, for example by printing the strips at a reference resolution, that is to say a resolution which would theoretically allow to attach the bands by a corresponding advance, and to ensure a relative displacement of the document and the print head according to a step less than that corresponding to the reference resolution.
  • a reference resolution that is to say a resolution which would theoretically allow to attach the bands by a corresponding advance, and to ensure a relative displacement of the document and the print head according to a step less than that corresponding to the reference resolution.
  • the number of bands produced being determined regardless of the advance of the document, advancing at a step lower than that corresponding to the reference resolution would have the effect of shifting all the successive bands in the same direction, by an increasing amplitude , which would decrease the size of the printed document.
  • a printing method which comprises the steps of printing dots at a resolution lower than the reference resolution while retaining a relative movement of the document and the print head according to a corresponding pitch. at the reference resolution.
  • the decrease in resolution which is associated with a corresponding magnification of the dimension of the elementary points causes a widening of each strip, which is regularly distributed over the whole document and thus ensures a slight overlap of the strips without offset from them. and without any noticeable change in format.
  • a dot printing device equipped with a printing head. associated with displacement members to effect relative displacement of the print head and of a document to be printed in at least one direction of movement, the print head comprising a series of print members spaced apart from one another others in the direction of movement of an effective spacing distance greater than a reference spacing distance, these printing members being made to print dots having an effective dimension greater than a reference dimension, the displacement being effected according to a step corresponding to the reference spacing distance.
  • the ink jet print head 1 is carried by a carriage 2 which moves in a first direction 4 which will be referred to hereinafter as the horizontal direction.
  • the carriage 2 slides on a guide 3 arranged parallel to the horizontal direction.
  • the movement of the carriage 2 on the guide 3 is ensured by drive members (5, 6).
  • these members comprise a belt 6 fixed to the carriage 2 and a motor 5 driving this belt.
  • the document to be printed 8 rests on a support 7 and moves thanks to drive means 9, relative to the print head 1 in a second direction 10 which will be referred to as direction vertical.
  • the drive means 9 comprise two rollers 11 between which the document is pinched.
  • the roller located under the document is equipped with a drive motor 12.
  • Figure 2 is an enlarged schematic representation of the face of the print head which faces the document to be printed.
  • the head 1 has a line of nozzles 13 inclined at an angle A relative to the vertical direction to obtain the desired resolutions in the horizontal and vertical directions.
  • the spacing distance d taken in the vertical direction is the inverse of the resolution taken in this direction. This resolution corresponds to a dimension of the nozzles for producing an impression of elementary stitches joined when adjacent nozzles are simultaneously controlled for printing.
  • a reference resolution for example equal to 7.7 point per millimeter in the vertical direction 10, corresponds to a reference spacing distance, ie 0.1299 millimeter in the example mentioned.
  • the corresponding reference feed of the document will have a reference pitch of 8.31 mm.
  • the vertical resolution of the print head is modified so that it is less than the reference resolution, for example 7.65 points per millimeter, which corresponds to an effective spacing distance d in the vertical direction greater than the reference spacing distance, ie 0.1307 mm in the example cited.
  • FIG. 3 the result of the printing of four successive bands of theoretically contiguous dots is partially illustrated, the left part of the figure illustrating the result obtained with a conventional inkjet printhead, and the part right illustrating the result obtained according to the invention.
  • the printing is supposed to be carried out by means of an ink jet printing head comprising three printing nozzles.
  • the successive bands bear the reference 14 and the specific references 14.1, 14.2, 14.3, and 14.4.
  • the elementary points bear the reference numeral 15 and have been hatched with different inclinations depending on the band to which they belong.
  • the elementary dots 15 are printed by a print head at the reference resolution and the advance of the document to pass from one strip to the other is carried out at a step corresponding to this reference resolution.
  • the successive printed bands 14 are not always perfectly joined, this is reflected for example by the appearance of a fictitious white line 16 between the bands 14.2 and 14.3.
  • the successive strips bear the reference numeral general 18 and the specific references 18.1, 18.2, 18.3 and 18.4.
  • the elementary points bear the reference numeral 17.
  • the elementary points 17 are printed with a printing head with a resolution lower than the reference resolution and have an effective dimension greater than the reference dimension of the points 15.
  • the step of relative displacement of the document and the head remains that corresponding to the reference resolution. This is reflected in the figure by the coincidence of the center line of the strips 14 and 18 illustrated in the figure by a fixed line.
  • the printed bands 18 are wider than the bands 14, which results in a slight overlap 19 between the bands 18.1 and 18.2 d on the one hand, and the bands 18.3 and 18.4 on the other hand, and the disappearance of the fictitious line 16 between the bands 18.2 and 18.3 without general offset of the bands.
  • This widening of the bands results in a very slight overflow of the extreme bands.
  • the resulting enlargement of the format is, however, completely imperceptible due to its extremely small amplitude.
  • the print head has been described with a single line of nozzles, it may include a series of nozzles arranged in a matrix. It is even possible to provide a print head comprising a number of nozzles sufficient to produce a whole strip of elementary dots at a single stroke, the relative movement of the print head and of the document being effected in one direction.

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  • Ink Jet (AREA)
  • Dot-Matrix Printers And Others (AREA)

Abstract

The apparatus is equipped with a printing head (1) associated with displacement members for executing a relative displacement of the printing head and of a document to be printed, in at least one direction of displacement (10), the printing head comprising a series of printing members (13) spaced from one another in the direction of displacement (10) at an effective spacing distance d greater than a reference spacing distance, whilst the displacement is executed at a rate corresponding to the reference spacing difference, so that an overlap between the successive printed bands is ensured. <IMAGE>

Description

La présente invention concerne un procédé et un dispositif d'impression par points, pouvant s'appliquer notamment à la télécopie.The present invention relates to a method and a device for dot printing, which can be applied in particular to facsimile.

On connaît des dispositifs d'impression par points comprenant une tête d'impression par points, par exemple une tête d'impression à jet d'encre montée sur un chariot associé à des organes d'entraînement pour déplacer le chariot relativement à un document selon deux directions de déplacement sensiblement perpendiculaires. Une tête de ce type comporte une série de buses d'impression disposées selon une ligne ou une matrice. Les buses d'impression sont espacées les unes des autres et sont disposées pour qu'un déplacement de la tête d'impression selon une première direction imprime une bande formée de points élémentaires émis par les buses de la tête qui sont commandées pour une impression. A ce propos, on rappelle que la résolution d'une tête d'impression à jet d'encre est définie par le nombre de points imprimés par unité de longueur selon la direction considérée. Des bandes de points successives sont réalisées séquentiellement en effectuant un déplacement relatif de la tête d'impression et du document selon une seconde direction, par exemple en faisant avancer le document selon une direction perpendiculaire à la direction de déplacement du chariot, le nombre de bandes étant déterminé pour balayer le format souhaité du document.Dots printing devices are known comprising a dots printing head, for example an ink jet printing head mounted on a carriage associated with drive members for moving the carriage relative to a document according to two substantially perpendicular directions of movement. A head of this type has a series of print nozzles arranged in a line or a matrix. The print nozzles are spaced from each other and are arranged so that a displacement of the print head in a first direction prints a strip formed of elementary dots emitted by the nozzles of the head which are controlled for printing. In this regard, it is recalled that the resolution of an ink jet print head is defined by the number of dots printed per unit of length according to the direction considered. Successive bands of dots are produced sequentially by carrying out a relative displacement of the print head and the document in a second direction, for example by advancing the document in a direction perpendicular to the direction of movement of the carriage, the number of bands being determined to scan the desired format of the document.

En principe, l'avance du document selon la seconde direction est calculée pour que les bandes successives soient accolées, c'est à dire que l'avance du document est égale au produit de la distance entre buses prise selon la direction d'avance, par le nombre de buses comprises dans la tête d'impression selon cette direction.In principle, the document advance in the second direction is calculated so that the successive bands are joined, that is to say that the document advance is equal to the product of the distance between nozzles taken in the direction of advance, by the number of nozzles included in the print head in this direction.

Toutefois, les différents jeux mécaniques résultants des tolérances de fabrication des pièces de montage du chariot font que deux bandes imprimées adjacentes ne sont pas toujours exactement accolées, ce qui se traduit par l'apparition d'une ligne blanche dite fictive entre ces bandes, c'est-à-dire que cette ligne blanche n'était pas prévue dans la commande d'impression. Cette ligne blanche est d'autant plus visible que la densité d'impression est plus forte, nuisant ainsi gravement à la qualité de l'image imprimée surtout lorsqu'il s'agit d'une image graphique.However, the various mechanical clearances resulting from the manufacturing tolerances of the carriage mounting parts mean that two adjacent printed bands are not always exactly joined, which results in the appearance of a so-called fictitious white line between these bands, that is, this white line was not provided in the print order. This white line is all the more visible as the print density is higher, thus seriously affecting the quality of the printed image especially when it is a graphic image.

Pour supprimer les lignes blanches fictives d'un document, on pourrait créer entre chaque bande imprimée une légère zone de recouvrement, par exemple en effectuant l'impression des bandes à une résolution de référence, c'est à dire à une résolution qui permettrait théoriquement d'accoler les bandes par une avance correspondante, et d'assurer un déplacement relatif du document et de la tête de d'impression selon un pas inférieur à celui correspondant à la résolution de référence. Toutefois, le nombre des bandes réalisées étant déterminé quelle que soit l'avance du document, une avance à un pas inférieur à celui correspondant à la résolution de référence aurait pour effet dé décaler toutes les bandes successives dans le même sens, selon une amplitude croissante, ce qui diminuerait le format du document imprimé.To remove the fictitious white lines from a document, a slight overlap zone could be created between each printed strip, for example by printing the strips at a reference resolution, that is to say a resolution which would theoretically allow to attach the bands by a corresponding advance, and to ensure a relative displacement of the document and the print head according to a step less than that corresponding to the reference resolution. However, the number of bands produced being determined regardless of the advance of the document, advancing at a step lower than that corresponding to the reference resolution would have the effect of shifting all the successive bands in the same direction, by an increasing amplitude , which would decrease the size of the printed document.

Selon l'invention, on propose un procédé d'impression qui comprend les étapes de réaliser une impression de points à une résolution inférieure à la résolution de référence tout en conservant un déplacement relatif du document et de la tête d'impression selon un pas correspondant à la résolution de référence.According to the invention, a printing method is proposed which comprises the steps of printing dots at a resolution lower than the reference resolution while retaining a relative movement of the document and the print head according to a corresponding pitch. at the reference resolution.

Ainsi, la diminution de la résolution qui se trouve associée à un grossissement correspondant de la dimension des points élémentaires provoque un élargissement de chaque bande, lequel est régulièrement réparti sur tout le document et assure ainsi un léger chevauchement des bandes sans décalage de celles-ci et sans modification perceptible du format.Thus, the decrease in resolution which is associated with a corresponding magnification of the dimension of the elementary points causes a widening of each strip, which is regularly distributed over the whole document and thus ensures a slight overlap of the strips without offset from them. and without any noticeable change in format.

Selon l'invention, on prévoit également un dispositif d'impression par points équipé d'une tête d'impression associée à des organes de déplacement pour effectuer un déplacement relatif de la tête d'impression et d'un document à imprimer selon au moins une direction de déplacement, la tête d'impression comportant une série d'organes d'impression espacés les uns des autres selon la direction de déplacement d'une distance d'écartement effective supérieure à une distance d'écartement de référence, ces organes d'impression étant réalisés pour imprimer des points ayant une dimension effective supérieure à une dimension de référence, le déplacement étant effectué selon un pas correspondant à la distance d'écartement de référence.According to the invention, there is also provided a dot printing device equipped with a printing head. associated with displacement members to effect relative displacement of the print head and of a document to be printed in at least one direction of movement, the print head comprising a series of print members spaced apart from one another others in the direction of movement of an effective spacing distance greater than a reference spacing distance, these printing members being made to print dots having an effective dimension greater than a reference dimension, the displacement being effected according to a step corresponding to the reference spacing distance.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention en relation avec les figures ci-jointes parmi lesquelles :

  • la figure 1 est une vue en perspective partielle schématique d'un dispositif d'impression à chariot,
  • la figure 2 est une représentation schématique agrandie de la face de la tête d'impression qui est tournée vers le document à imprimer,
  • la figure 3 est un schéma comparatif entre le résultat d'impression d'un document obtenu avec les moyens d'impression classiques et le résultat d'impression du même document obtenu avec le procédé et le dispositif de l'invention.
Other characteristics and advantages of the invention will appear on reading the following description of a particular non-limiting embodiment of the invention in relation to the attached figures, among which:
  • FIG. 1 is a schematic partial perspective view of a carriage printing device,
  • FIG. 2 is an enlarged schematic representation of the face of the print head which faces the document to be printed,
  • Figure 3 is a comparative diagram between the printing result of a document obtained with conventional printing means and the printing result of the same document obtained with the method and the device of the invention.

En référence à la figure 1, la tête d'impression à jet d'encre 1 est portée par un chariot 2 qui se déplace selon une première direction 4 qui sera par la suite dénommée direction horizontale. Le chariot 2 coulisse sur un guide 3 disposé parallèlement à la direction horizontale. Le déplacement du chariot 2 sur le guide 3 est assuré par des organes d'entraînement (5, 6). Dans le mode de réalisation illustré, ces organes comportent une courroie 6 fixée au chariot 2 et un moteur 5 entraînant cette courroie.Referring to Figure 1, the ink jet print head 1 is carried by a carriage 2 which moves in a first direction 4 which will be referred to hereinafter as the horizontal direction. The carriage 2 slides on a guide 3 arranged parallel to the horizontal direction. The movement of the carriage 2 on the guide 3 is ensured by drive members (5, 6). In the illustrated embodiment, these members comprise a belt 6 fixed to the carriage 2 and a motor 5 driving this belt.

Le document à imprimer 8, par exemple une feuille de papier, repose sur un support 7 et se déplace grâce à des moyens d'entraînement 9, relativement à la tête d'impression 1 selon une seconde direction 10 qui sera par la suite dénommée direction verticale. Les moyens d'entraînement 9 comportent deux rouleaux 11 entre lesquels le document est pincé. Le rouleau situé sous le document est équipé d'un moteur d'entraînement 12.The document to be printed 8, for example a sheet of paper, rests on a support 7 and moves thanks to drive means 9, relative to the print head 1 in a second direction 10 which will be referred to as direction vertical. The drive means 9 comprise two rollers 11 between which the document is pinched. The roller located under the document is equipped with a drive motor 12.

La figure 2 est une représentation schématique agrandie de la face de la tête d'impression qui est tournée vers le document à imprimer. La tête 1 comporte une ligne de buses 13 inclinée d'un angle A par rapport à la direction verticale pour obtenir les résolutions souhaitées selon les directions horizontales et verticales. La distance d'écartement d prise selon la direction verticale est l'inverse de la résolution prise selon cette direction. A cette résolution correspond une dimension des buses pour réaliser une impression de points élémentaires accolés lorsque des buses adjacentes sont simultanément commandées pour une impression.Figure 2 is an enlarged schematic representation of the face of the print head which faces the document to be printed. The head 1 has a line of nozzles 13 inclined at an angle A relative to the vertical direction to obtain the desired resolutions in the horizontal and vertical directions. The spacing distance d taken in the vertical direction is the inverse of the resolution taken in this direction. This resolution corresponds to a dimension of the nozzles for producing an impression of elementary stitches joined when adjacent nozzles are simultaneously controlled for printing.

A une résolution de référence, par exemple égale à 7,7 point par millimètre selon la direction verticale 10, correspond une distance d'écartement de référence, soit 0,1299 millimètre dans l'exemple mentionné. Pour une tête d'impression comportant 64 buses, l'avance de référence correspondante du document aura un pas de référence de 8,31 mm.A reference resolution, for example equal to 7.7 point per millimeter in the vertical direction 10, corresponds to a reference spacing distance, ie 0.1299 millimeter in the example mentioned. For a print head with 64 nozzles, the corresponding reference feed of the document will have a reference pitch of 8.31 mm.

Selon l'invention, tout en commandant séquentiellement le moteur 12 pour obtenir une avance du document égale au pas de référence, on modifie la résolution verticale de la tête d'impression pour que celle-ci soit inférieure à la résolution de référence, par exemple de 7,65 points par millimètre, ce qui correspond à une distance d'écartement d effective selon la direction verticale supérieure à la distance d'écartement de référence, soit 0,1307 mm dans l'exemple cité.According to the invention, while sequentially controlling the motor 12 to obtain a document advance equal to the reference pitch, the vertical resolution of the print head is modified so that it is less than the reference resolution, for example 7.65 points per millimeter, which corresponds to an effective spacing distance d in the vertical direction greater than the reference spacing distance, ie 0.1307 mm in the example cited.

Ainsi, alors que dans les dispositifs conventionnels la largeur d'une bande est de 8,31 mm, on obtient ici une largeur de bande de 8,36 mm, ce qui permet d'absorber un jeu de 0,05 mm entre deux bandes.Thus, while in conventional devices the width of a strip is 8.31 mm, here a strip width of 8.36 mm is obtained, which makes it possible to absorb a clearance of 0.05 mm between two strips .

Sur la figure 3, on a illustré partiellement le résultat de l'impression de quatre bandes successives de points théoriquement accolés, la partie gauche de la figure illustrant le résultat obtenu avec une tête d'impression à jet d'encre classique, et la partie droite illustrant le résultat obtenu selon l'invention. Dans les deux cas l'impression est supposée être effectuée au moyen d'une tête d'impression à jet d'encre comportant trois buses d'impression.In FIG. 3, the result of the printing of four successive bands of theoretically contiguous dots is partially illustrated, the left part of the figure illustrating the result obtained with a conventional inkjet printhead, and the part right illustrating the result obtained according to the invention. In both cases the printing is supposed to be carried out by means of an ink jet printing head comprising three printing nozzles.

Sur la partie gauche de la figure 3, les bandes successives portent la référence 14 et les références particulières 14.1, 14.2, 14.3, et 14.4. Les points élémentaires portent la référence numérique 15 et ont été hachurés avec des inclinaisons différentes selon la bande à laquelle ils appartiennent. Les points élémentaires 15 sont imprimés par une tête d'impression à la résolution de référence et l'avance du document pour passer d'une bande à l'autre est effectuée selon un pas correspondant à cette résolution de référence. Toutefois, du fait des jeux mécaniques du chariot, les bandes successives imprimées 14 ne sont pas toujours parfaitement accolées, ceci se traduit par exemple par l'apparition d'une ligne blanche fictive 16 entre les bandes 14.2 et 14.3.On the left-hand side of FIG. 3, the successive bands bear the reference 14 and the specific references 14.1, 14.2, 14.3, and 14.4. The elementary points bear the reference numeral 15 and have been hatched with different inclinations depending on the band to which they belong. The elementary dots 15 are printed by a print head at the reference resolution and the advance of the document to pass from one strip to the other is carried out at a step corresponding to this reference resolution. However, due to the mechanical games of the carriage, the successive printed bands 14 are not always perfectly joined, this is reflected for example by the appearance of a fictitious white line 16 between the bands 14.2 and 14.3.

Sur la partie droite de la figure 3, on a de la même façon illustré le résultat de l'impression des quatre bandes successives du document, obtenue cette fois par le procédé et le dispositif de l'invention, les bandes successives portent la référence numérique générale 18 et les références particulières 18.1, 18.2, 18.3 et 18.4. Les points élémentaires portent la référence numérique 17. Les points élémentaires 17 sont imprimés avec une tête d'impression à une résolution inférieure à la résolution de référence et ont une dimension effective supérieure à la dimension de référence des points 15. Le pas de déplacement relatif du document et de la tête reste celui correspondant à la résolution de référence. Ceci se traduit sur la figure par la coïncidence de la ligne médiane des bandes 14 et 18 illustrée sur la figure par un trait fixe mixte.On the right-hand side of FIG. 3, the result of the printing of the four successive strips of the document, similarly illustrated this time by the method and the device of the invention, has been illustrated, the successive strips bear the reference numeral general 18 and the specific references 18.1, 18.2, 18.3 and 18.4. The elementary points bear the reference numeral 17. The elementary points 17 are printed with a printing head with a resolution lower than the reference resolution and have an effective dimension greater than the reference dimension of the points 15. The step of relative displacement of the document and the head remains that corresponding to the reference resolution. This is reflected in the figure by the coincidence of the center line of the strips 14 and 18 illustrated in the figure by a fixed line.

Du fait de la résolution inférieure à la résolution de référence et de l'accroissement correspondant de la dimension des points élémentaires, les bandes imprimées 18 sont plus larges que les bandes 14, ce qui entraîne un léger recouvrement 19 entre les bandes 18.1 et 18.2 d'une part, et les bandes 18.3 et 18.4 d'autre part, et la disparition de la ligne fictive 16 entre les bandes 18.2 et 18.3 sans décalage général des bandes. Cet élargissement des bandes se traduit par un très léger débordement des bandes extrêmes. L'agrandissement de format qui en résulte est toutefois totalement imperceptible en raison de son amplitude extrêmement faible.Due to the lower resolution than the reference resolution and the corresponding increase in the size of the elementary dots, the printed bands 18 are wider than the bands 14, which results in a slight overlap 19 between the bands 18.1 and 18.2 d on the one hand, and the bands 18.3 and 18.4 on the other hand, and the disappearance of the fictitious line 16 between the bands 18.2 and 18.3 without general offset of the bands. This widening of the bands results in a very slight overflow of the extreme bands. The resulting enlargement of the format is, however, completely imperceptible due to its extremely small amplitude.

Bien entendu l'invention n'est pas limitée au mode de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications.Of course, the invention is not limited to the embodiment described and it is possible to make variant embodiments without departing from the scope of the invention as defined by the claims.

En particulier, bien que la tête d'impression ait été décrite avec une seule ligne de buses elle peut comporter une série de buses disposées en matrice. On peut même prévoir une tête d'impression comportant un nombre de buses suffisant pour réaliser d'un seul coup toute une bande de points élémentaires, le déplacement relatif de la tête d'impression et du document étant effectué selon une seule direction.In particular, although the print head has been described with a single line of nozzles, it may include a series of nozzles arranged in a matrix. It is even possible to provide a print head comprising a number of nozzles sufficient to produce a whole strip of elementary dots at a single stroke, the relative movement of the print head and of the document being effected in one direction.

Bien que l'invention ait été décrite en relation avec une résolution prise selon la direction verticale, elle peut également être mise en oeuvre selon la direction horizontale.Although the invention has been described in relation to a resolution taken in the vertical direction, it can also be implemented in the horizontal direction.

Bien que l'invention ait été décrite en relation avec une tête d'impression à jet d'encre, elle peut être mise en oeuvre pour tout dispositif d'impression par points, notamment une tête d'impression thermique.Although the invention has been described in relation to an ink jet print head, it can be applied used for any dot printing device, in particular a thermal printing head.

Claims (2)

Procédé d'impression d'un document (8) au moyen d'une tête d'impression par points (1) comprenant une série d'organes d'impression (13), ce procédé comportant les étapes de réaliser séquentiellement une impression de points et un déplacement relatif du document (8) et de la tête d'impression (1) selon un pas correspondant à une résolution de référence, caractérisé en ce que l'impression de points est effectuée selon une résolution inférieure à la résolution de référence.Method for printing a document (8) by means of a dot printing head (1) comprising a series of printing members (13), this method comprising the steps of sequentially printing dot printing and a relative movement of the document (8) and the print head (1) according to a step corresponding to a reference resolution, characterized in that the printing of dots is carried out at a resolution lower than the reference resolution. Dispositif d'impression par points équipé d'une tête d'impression (1) associée à des organes de déplacement (9) pour effectuer un déplacement relatif de la tête d'impression et d'un document à imprimer (8) selon au moins une direction de déplacement (10), la tête d'impression comportant une série d'organes d'impression (13) espacés les uns des autres d'une distance d'écartement effective selon la direction de déplacement (10), pour imprimer des points ayant une dimension effective, le déplacement étant effectué selon un pas correspondant à une distance d'écartement de référence associée à une dimension de référence des points, caractérisé en ce que la distance d'écartement effective et la dimension effective des points sont respectivement supérieures à la distance d'écartement de référence et à la dimension de référence.Dot-print device equipped with a print head (1) associated with displacement members (9) to effect relative displacement of the print head and of a document to be printed (8) according to at least a direction of movement (10), the printhead comprising a series of printing members (13) spaced from each other by an effective spacing distance along the direction of movement (10), for printing points having an effective dimension, the displacement being carried out at a step corresponding to a reference spacing distance associated with a reference dimension of the points, characterized in that the effective spacing distance and the effective dimension of the points are respectively greater at the reference spacing distance and at the reference dimension.
EP94401538A 1993-07-27 1994-07-05 Method and apparatus for a dot printer Withdrawn EP0636485A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9309233 1993-07-27
FR9309233A FR2708233B1 (en) 1993-07-27 1993-07-27 Method and device for dot printing.

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EP0636485A1 true EP0636485A1 (en) 1995-02-01

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EP94401538A Withdrawn EP0636485A1 (en) 1993-07-27 1994-07-05 Method and apparatus for a dot printer

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EP (1) EP0636485A1 (en)
JP (1) JPH07148976A (en)
FR (1) FR2708233B1 (en)

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US6409309B1 (en) * 1995-12-29 2002-06-25 Sony Corporation Recording apparatus having high resolution recording function
EP0832743A2 (en) * 1996-09-30 1998-04-01 Canon Kabushiki Kaisha Ink-jet printer and printing method, auxiliary member, ink-jet head, warp correction method, ink-jet head unit and color-mixture reducing method
EP0832744A2 (en) * 1996-09-30 1998-04-01 Canon Kabushiki Kaisha Ink-jet print apparatus and method
EP0832744A3 (en) * 1996-09-30 1999-01-13 Canon Kabushiki Kaisha Ink-jet print apparatus and method
EP0832743A3 (en) * 1996-09-30 1999-07-07 Canon Kabushiki Kaisha Ink-jet printer and printing method, auxiliary member, ink-jet head, warp correction method, ink-jet head unit and color-mixture reducing method
US6109727A (en) * 1996-09-30 2000-08-29 Canon Kabushiki Kaisha Ink-jet printer and printing method, auxiliary member, ink-jet head, warp correction method, ink-jet head unit and color-mixture reducing method
US6227647B1 (en) 1996-09-30 2001-05-08 Canon Kabushiki Kaisha Ink-jet print apparatus and method using a pivoting ink-jet recording head
US6505908B1 (en) 1996-09-30 2003-01-14 Canon Kabushiki Kaisha Ink-jet printer and printing method, auxiliary member, ink-jet head, warp correction method, ink-jet head unit and color-mixture reducing method
EP1392091A2 (en) * 2002-08-20 2004-02-25 Xerox Corporation Method and system for printing integrated circuit patterns
EP1392091A3 (en) * 2002-08-20 2004-12-01 Xerox Corporation Method and system for printing integrated circuit patterns
US6890050B2 (en) 2002-08-20 2005-05-10 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US7303244B2 (en) 2002-08-20 2007-12-04 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US7549719B2 (en) 2002-08-20 2009-06-23 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US7963628B2 (en) 2002-08-20 2011-06-21 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US7992958B2 (en) 2002-08-20 2011-08-09 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US7997680B2 (en) 2002-08-20 2011-08-16 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head
US8104863B2 (en) 2002-08-20 2012-01-31 Palo Alto Research Center Incorporated Method for the printing of homogeneous electronic material with a multi-ejector print head

Also Published As

Publication number Publication date
FR2708233A1 (en) 1995-02-03
FR2708233B1 (en) 1995-09-01
JPH07148976A (en) 1995-06-13

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