EP0159402A1 - Ink recording device with variable character quality - Google Patents

Ink recording device with variable character quality Download PDF

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Publication number
EP0159402A1
EP0159402A1 EP84115424A EP84115424A EP0159402A1 EP 0159402 A1 EP0159402 A1 EP 0159402A1 EP 84115424 A EP84115424 A EP 84115424A EP 84115424 A EP84115424 A EP 84115424A EP 0159402 A1 EP0159402 A1 EP 0159402A1
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EP
European Patent Office
Prior art keywords
ink
recording medium
quality
characters
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84115424A
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German (de)
French (fr)
Other versions
EP0159402B1 (en
Inventor
Artur Dipl.-Ing. Milbrandt
Rüdiger Ing. Hillmann
Hubertus Ing. Reinfeld
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Siemens AG
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Siemens AG
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Publication of EP0159402A1 publication Critical patent/EP0159402A1/en
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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
    • B41J2/5056—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 using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • 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
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation

Definitions

  • the invention relates to an ink writing device for displaying characters and / or graphic patterns of different font quality according to the preamble of claim 1.
  • an ink writing device To display characters or graphic patterns with an ink writing device, it is known to spray individual ink droplets from one or more nozzles of an ink print head against a recording medium.
  • an ink writing device as described, for example, in Siemens magazine 51, 1977, pages 219 to 221, the droplet is ejected in such a way that the drive elements assigned to the individual nozzles of the ink print head, hereinafter referred to as transducers, are individual, that is to say depending on them whether droplet ejection should take place or not be controlled by a control circuit.
  • transducers the drive elements assigned to the individual nozzles of the ink print head
  • any desired character can be represented on the recording medium in this way by a grid-like arrangement of ink dots.
  • the characters or patterns shown are therefore always in a grid, the column and line spacing of which is determined by the movement of the write head in relation to the record carrier and by the spray frequency of the ink print head.
  • Each ejected ink droplet has the same size, ie the ink volume of each ejected ink droplet chens is constant. This means that the diameters of the ink dots applied to the recording medium also have a constant diameter.
  • the signals for controlling the piezo transducers are formed in a control circuit as a function of the information about the character to be displayed, which information is taken from a character generator, wherein the grid in which the character is represented in a dot form is also taken into account.
  • an improvement in font quality over standard quality can be achieved by increasing the number of ink droplets ejected to represent a character within the matrix, which is tantamount to reducing the printing speed.
  • the individual points of the matrix are overwritten, so to speak, it being expedient to carry out a feed comprising, for example, half a column spacing.
  • the object of the invention is to provide a possibility for an ink writing device with which, even when displaying characters or patterns with different, different font qualities, there is always a largely closed line of characters or patterns without changing the geometry of the ink print head.
  • One of the main advantages of the invention is that the setting of the font quality for the characters to be displayed, in particular the setting for the display in a draft, a standard or in a fine writing quality can be carried out in a simple manner in the control circuit of the ink writing device, whereby by changing the droplet size, ie by varying the volume of the ink individual droplets in both cases a closed line as well as a sharp contour of the characters shown is guaranteed.
  • Fig. 1 serves to explain the imprint of a character with different font quality according to the prior art, in which the ink droplets each have the same, constant diameter, i.e. have the same and constant volume.
  • This example is based on a matrix with five columns (x-direction) and seven rows (y-direction), which is often used to display characters with matrix printers.
  • the outlet openings of the nozzles of an ink print head which are usually arranged in a nozzle plate D.P., are shown on the left in FIG.
  • the seven outlet nozzles D1 to D7 arranged here as an example and arranged in a vertical row
  • an arrangement with two or more rows of nozzles, which are then expediently offset from one another could also be used.
  • the character “L” is to be printed first in the so-called draft font quality (font quality S1), not all of the cross points of the matrix are used. Rather, both in the column direction (x direction) and in the row direction (y direction) of the matrix, only every second crossing point is printed.
  • the character “L” then has the shape provided with the reference symbol S1.
  • the shape of the character printed with this font quality has the shape provided with the reference character S2.
  • the matrix dots are first printed with standard font quality as in the printing of the character, with the feed in the x direction being simultaneously reduced to half. Then there is an offset in the y direction by half a line spacing with subsequent ejection of ink droplets for the individual columns.
  • the character formed in this way is shown under the reference symbol S3 in FIG. 1.
  • Fig. 2 shows the representation of the character "L” taking into account the teaching of the invention.
  • the size of the ink droplets applied to the recording medium ie the volume of each individual ink droplet, is changed depending on the type of font quality selected.
  • the nozzle plate DP shown on the left in FIG. 3 with the seven outlet openings of the nozzles D1 to D7 corresponds to that shown in FIG. 1 th nozzle plate.
  • To represent the character "L” in draft font quality 51 ink droplets with a relatively large volume of ink are ejected, so that the diameter d1 of the ink dots applied to the recording medium is such that the individual ink dots touch, for example as shown in FIG .
  • the volume of ink ejected with each ink droplet is reduced compared to the design font quality 51.
  • the ink dots applied to the recording medium for this standard font quality have a diameter d2 which is smaller than the diameter d1. In this way, the character "L" provided with the reference symbol 52 is formed.
  • the volume of ink that is ejected with each ink droplet is reduced again.
  • the ink dots applied to the recording medium then each have a diameter d3, which in turn is smaller than the diameter d2. In this way, the character "L" provided with the reference symbol S3 in FIG. 3 is produced.
  • the lines of the character shown form a closed form in all three font qualities, and that, in addition, the outer contours of the characters are sharper even when the ink dots overlap on the recording medium due to the reduction in the diameter of the individual ink droplets. Overall, the visual impression is significantly improved with each of the selected font qualities.
  • the ink writing device consists of the actual ink print head K, which is, for example, a plastic body which contains a plurality of ink channels which point in the direction of the recording medium P end at the nozzle plate DP.
  • a transducer (not shown here) is assigned to each ink channel and can be controlled in pulses by means of an electronic control ST. Depending on a drive pulse, the transducer is deformed, which leads to the ejection of a single droplet of ink.
  • the control pulses are formed in accordance with the signals which are emitted by a character generator ZG.
  • the control circuit ST also has the input signals S1, S2 and S3 available, which are output in accordance with the selected font quality.
  • the signals S1, S2 and S3 can be input, for example, by means of manually operated switches.
  • the matrix pattern corresponding to the corresponding font quality is defined in the control circuit ST and the activation of the transducers is determined according to the selected matrix pattern.
  • the signals for the movement of the ink print head K and the recording medium P are also emitted via the control circuit ST.
  • two drive devices namely a first motor MI for moving the ink print head K and a second motor M2 for moving the recording medium P.
  • the ink print head is moved line by line, that is to say horizontally, along the line over the recording medium P via the first motor M1.
  • the second motor M2 is used for line-by-line transport of the recording medium P.
  • the motor M2 also takes over the transport offset by half a line spacing of the record carrier for the representation of a character in visual lettering quality.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

1. Ink recording device having a print head, the ink channels of which, directed with the outlet openings towards the recording medium, are in each case assigned a transducer element, which uses trigger pulses, formed in a control cuircuit corresponding to the characters or patterns to be represented, to effect a discharge of ink in the form of droplets, having drive devices for the print head and for the recording medium in order to generate a relative movement between print head and recording medium, the matrix assigned to the individual characters or graphic patterns being varied for the representation of characters or graphic patterns of different type quality and, depending on signals for different type qualities, the volume of the individual ink droplets sprayed against the recording medium being adjustable according to the type quality by an alteration of the amplitude or of the duration of the control pulses, characterized in that the adjustment of the droplets size for different type quality is such that the volume of a droplet, and thus the diameter (d1, d2, d3) of an image dot on the recording medium (P) is largest in the draft quality operating mode, smallest in the letter quality operating mode, and in that, for each chosen type quality, the diameter (d1, d2, d3) of the ink dots applied to the recording medium (P), which can be controlled by the control signals (S1, S2, S3) is such that the ink dots in each case at least touch in the matrix (x, y), predetermined for the chosen type quality, on the recording medium (P).

Description

Die Erfindung betrifft eine Tintenschreibeinrichtung zur Darstellung von Zeichen und/oder grafischen Mustern unterschiedlicher Schriftqualität gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to an ink writing device for displaying characters and / or graphic patterns of different font quality according to the preamble of claim 1.

Zur Darstellung von Zeichen oder von grafischen Mustern mit einer Tintenschreibeinrichtung werden bekanntlich einzelne Tintentröpfchen aus einer oder aus mehreren Düsen eines Tintendruckkopfes gegen einen Aufzeichnungsträger gespritzt. Mit einer Tintenschreibeinrichtung, wie sie z.B. in der Siemens-Zeitschrift 51, 1977, Seiten 219 bis 221 beschrieben ist, erfolgt der Tröpfchenausstoß in der Weise, daß die den einzelnen Düsen des Tintendruckkopfes zugeordneten Antriebselemente, im folgenden Wandler genannt, individuell, d.h. abhängig davon, ob ein Tröpfchenausstoß stattfinden soll oder nicht über eine Steuerschaltung angesteuert werden. Unter Berücksichtigung einer Relativbewegung zwischen dem Tintendruckkopf und dem Aufzeichnungsträger kann auf diese Weise jedes gewünschte Zeichen auf dem Aufzeichnungsträger durch eine rasterförmige Anordnung von Tintenpunkten dargestellt werden. Die dargestellten Zeichen oder Muster liegen somit stets in einem Raster, dessen Spalten- und Zeilenabstände durch die Bewegung des Schreibkopfes in Bezug auf den Aufzeichnungsträger und durch die Spritzfrequenz des Tintendruckkopfes bestimmt ist. Jedes ausgestoßene Tintentröpfchen hat dabei die gleiche Größe, d.h. das Tintenvolumen jedes ausgestoßenen Tintentröpfchens ist jeweils konstant. Das bedeutet, daß auch die Durchmesser der auf den Aufzeichnungsträger aufgetragenen Tintenpunkte einen konstanten Durchmesser besitzen. Die Signale zur Ansteuerung der Piezowandler werden in einer Steuerschaltung abhängig von den aus einem Zeichengenerator entnommene Informationen über das darzustellende Zeichen gebildet, wobei zusätzlich noch das Raster, in welchem das Zeichen punktförmig dargestellt wird, berücksichtigt wird.To display characters or graphic patterns with an ink writing device, it is known to spray individual ink droplets from one or more nozzles of an ink print head against a recording medium. With an ink writing device, as described, for example, in Siemens magazine 51, 1977, pages 219 to 221, the droplet is ejected in such a way that the drive elements assigned to the individual nozzles of the ink print head, hereinafter referred to as transducers, are individual, that is to say depending on them whether droplet ejection should take place or not be controlled by a control circuit. Taking into account a relative movement between the ink print head and the recording medium, any desired character can be represented on the recording medium in this way by a grid-like arrangement of ink dots. The characters or patterns shown are therefore always in a grid, the column and line spacing of which is determined by the movement of the write head in relation to the record carrier and by the spray frequency of the ink print head. Each ejected ink droplet has the same size, ie the ink volume of each ejected ink droplet chens is constant. This means that the diameters of the ink dots applied to the recording medium also have a constant diameter. The signals for controlling the piezo transducers are formed in a control circuit as a function of the information about the character to be displayed, which information is taken from a character generator, wherein the grid in which the character is represented in a dot form is also taken into account.

Für den praktischen Einsatz von Tintenschreibeinrichtungen wird häufig gefordert, die Zeichen mit verschiedener, unterschiedlicher Schriftqualität darzustellen. Man unterscheidet neuerdings zwischen einer sogenannten Entwurfsqualität (draft quality), einer Standardqualität und einer sogenannten Schönschriftqualität. Letztere wird häufig auch durch den Ausdruck "Near Letter Quality" (NLQ) bezeichnet. Es ist bekannt (DE-OS 33 07 196), zur Erzielung verschiedener Schriftqualitäten die Druckgeschwindigkeit zu verändern, d.h. die Druckgeschwindigkeit gegenüber der für die Darstellung von Zeichen in einer Standardqualität vorgesehene Druckgeschwindigkeit zu verdoppeln und dabei jeweils nur in jeder zweiten Spalte der Matrix ein Tintentröpchen auszustoßen. Es ist einleuchtend, daß damit die Qualität reduziert ist und z.B. Zeichen in der sogenannten Entwurfsqualität abgedruckt werden. Andererseits kann man eine Verbesserung der Schriftqualität gegenüber der Standardqualität dadurch erreichen, daß die Anzahl der zur Darstellung eines Zeichens innerhalb der Matrix ausgestoßenen Tintentröpfchen vergrößert wird, was gleichbedeutend mit einer Reduzierung der Druckgeschwindigkeit ist. In diesem Falle findet sozusagen ein Überschreiben der einzelnen Punkte der Matrix statt, wobei es zweckmäßig ist, einen beispielsweise einen halben Spaltenabstand umfassenden Vorschub durchzuführen.For the practical use of ink writing devices, it is often required to display the characters with different, different font quality. A distinction has recently been made between a so-called draft quality, a standard quality and a so-called fine writing quality. The latter is often also referred to by the expression "Near Letter Quality" (NLQ). It is known (DE-OS 33 07 196) to change the printing speed to achieve different font qualities, i.e. to double the printing speed compared to the printing speed provided for the representation of characters in a standard quality and to only eject an ink droplet in every second column of the matrix. It is obvious that this reduces the quality and e.g. Characters can be printed in the so-called design quality. On the other hand, an improvement in font quality over standard quality can be achieved by increasing the number of ink droplets ejected to represent a character within the matrix, which is tantamount to reducing the printing speed. In this case, the individual points of the matrix are overwritten, so to speak, it being expedient to carry out a feed comprising, for example, half a column spacing.

Mit diesen Möglichkeiten ist jedoch insofern ein Problem verbunden, als lediglich bei der Standard-Schriftqualität der optische Eindruck eines geschlossenen Zeichenzuges entsteht. Bei einer Darstellung der Zeichen in Entwurfsqualität verschlechtert sich der optische Eindruck der dargestellten Zeichen deshalb, weil die einzelnen Punkte, aus denen das Zeichen gebildet ist, deutlich erkennbar sind. Bei der Darstellung der Zeichen in der Schönschriftqualität besteht die Gefahr, daß infolge des kleineren Abstandes der einzelnen Tintentröpfchen zueinander diese zu stark ineinander fließen, wodurch die Konturen der Zeichen unscharf werden. Außerdem erscheint durch die veränderte Proportion Schrifthöhe zu Strichdicke ein dargestelltes Zeichen verschwommen.However, there is a problem with these options in that only the standard font quality creates the visual impression of a closed drawing string. When the characters are displayed in draft quality, the visual impression of the characters shown deteriorates because the individual points from which the character is formed are clearly recognizable. When the characters are displayed in the fine writing quality, there is a risk that due to the smaller spacing of the individual ink droplets from one another, these will flow too strongly into one another, as a result of which the contours of the characters will become blurred. In addition, the changed proportion of the font height to the line thickness makes a displayed character appear blurred.

Aufgabe der Erfindung Ist es, für eine Tintenschreibeinrichtung eine Möglichkeit anzugeben, mit der auch bei der Darstellung von Zeichen oder Mustern mit verschiedenen, unterschiedlichen Schriftqualitäten stets ein weitgehend geschlossener Linienzug der Zeichen oder Muster entsteht, ohne daß die Geometrie des Tintendruckkopfes geändert wird.The object of the invention is to provide a possibility for an ink writing device with which, even when displaying characters or patterns with different, different font qualities, there is always a largely closed line of characters or patterns without changing the geometry of the ink print head.

Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Weitere im Rahmen der Erfindung liegende vorteilhafte Ausgestaltungen sind in den Unteransprüchen gekennzeichnet.This object is achieved in accordance with the characterizing features of patent claim 1. Further advantageous refinements within the scope of the invention are characterized in the subclaims.

Einer der wesentlichen Vorteile der Erfindung besteht darin, daß die Einstellung der Schriftqualität für die darzustellenden Zeichen, insbesondere die Einstellung auf die Darstellung in einer Entwurfs-, einer Standard- oder in einer Schönschriftqualität in einfacher Weise in der Steuerschaltung der Tintenschreibeinrichtung durchgeführt werden kann, wobei durch die Veränderung der Tröpfchengröße, d.h. durch eine Variation des Tintenvolumens der einzelnen Tröpfchen in jedem Falle sowohl ein geschlossener Linienzug als aber auch eine scharfe Kontur der dargestellten Zeichen gewährleistet ist.One of the main advantages of the invention is that the setting of the font quality for the characters to be displayed, in particular the setting for the display in a draft, a standard or in a fine writing quality can be carried out in a simple manner in the control circuit of the ink writing device, whereby by changing the droplet size, ie by varying the volume of the ink individual droplets in both cases a closed line as well as a sharp contour of the characters shown is guaranteed.

Einzelheiten der Erfindung werden im folgenden unter Bezugnahme auf die Zeichnungen erläutert. Dabei zeigen

  • Fig. 1 ein Zeichen mit konstantem Tröpfchendurchmesser,
  • Fig. 2 ein Zeichen mit erfindungsgemäß verändertem Tröpfchendurchmesser und
  • Fig. 3 ein Beispiel für eine Tintenschreibeinrichtung mit der die Erfindung realisiert werden kann.
Details of the invention are explained below with reference to the drawings. Show
  • 1 is a character with constant droplet diameter,
  • Fig. 2 is a character with the droplet diameter changed according to the invention and
  • Fig. 3 shows an example of an ink writing device with which the invention can be implemented.

Das in Fig. 1 dargestellte Beispiel.dient zur Erläuterung des Abdruckes eines Zeichens mit unterschiedlicher Schriftqualität nach dem Stande der Technik, bei dem die Tintentröpfchen jeweils gleichen, konstanten Durchmesser, d.h. gleiches und konstantes Volumen besitzen. Diesem Beispiel liegt eine zur Darstellung von Zeichen mit Matrixdruckern häufig verwendete Matrix mit fünf Spalten (x-Richtung) und sieben Zeilen (y-Richtung) zugrunde. Die Austrittsöffnungen der Düsen eines Tintendruckkopfes, die üblicherweise in einer Düsenplatte.DP angeordnet sind, sind auf der linken Seite in Fig. 1 dargestellt. Anstelle der hier als Beispiel verwendeten, in einer senkrechten Reihe angeordneten, sieben Austrittsdüsen D1 bis D7, könnte auch eine Anordnung mit zwei oder mehr Reihen von Düsen, die dann zweckmäßigerweise gegeneinander versetzt sind, verwendet werden.The example shown in Fig. 1 serves to explain the imprint of a character with different font quality according to the prior art, in which the ink droplets each have the same, constant diameter, i.e. have the same and constant volume. This example is based on a matrix with five columns (x-direction) and seven rows (y-direction), which is often used to display characters with matrix printers. The outlet openings of the nozzles of an ink print head, which are usually arranged in a nozzle plate D.P., are shown on the left in FIG. Instead of the seven outlet nozzles D1 to D7 arranged here as an example and arranged in a vertical row, an arrangement with two or more rows of nozzles, which are then expediently offset from one another, could also be used.

Unter der Annahme, daß z.B. das Zeichen "L" zunächst in der sogenannten Entwurfsschriftqualität (Schriftqualität S1) abgedruckt werden soll, werden nicht sämtliche Kreuzungspunkte der Matrix ausgenützt. Vielmehr wird sowohl in Spaltenrichtung (x-Richtung) als auch in Zeilenrichtung (y-Richtung) der Matrix jeweils nur jeder zweite Kreuzungspunkt bedruckt. Das Zeichen "L" hat dann die mit dem Bezugszeichen S1 versehene Form. Für die Darstellung des gleichen- Zeichens "L" in der sogenannten Standard- schriftqualität werden sämtliche für dieses Zeichen möglichen Matrixpunkte besetzt. Die Form des mit dieser Schriftqualität abgedruckten Zeichens hat die mit dem Bezugszeichen S2 versehene Form. Zur Darstellung des gleichen Zeichens "L" in der sogenannten Schönschriftqualität werden zunächst die Matrixpunkte wie im Abdruck des Zeichens mit Standardschriftqualität bedruckt, wobei zugleich der Vorschub in x-Richtung auf die Hälfte reduziert wird. Anschließend findet dann ein Versatz in y-Richtung um einen halben Zeilenabstand mit nachfolgendem Ausstoß von Tintentröpfchen für die einzelnen Spalten statt. Das auf diese Weise gebildete Zeichen ist unter dem Bezugszeichen S3 in Fig. 1 dargestellt.Assuming that, for example, the character "L" is to be printed first in the so-called draft font quality (font quality S1), not all of the cross points of the matrix are used. Rather, both in the column direction (x direction) and in the row direction (y direction) of the matrix, only every second crossing point is printed. The character "L" then has the shape provided with the reference symbol S1. For the representation of the same character "L" in the so-called standard font quality, all possible matrix points for this character are occupied. The shape of the character printed with this font quality has the shape provided with the reference character S2. To display the same character "L" in the so-called fine writing quality, the matrix dots are first printed with standard font quality as in the printing of the character, with the feed in the x direction being simultaneously reduced to half. Then there is an offset in the y direction by half a line spacing with subsequent ejection of ink droplets for the individual columns. The character formed in this way is shown under the reference symbol S3 in FIG. 1.

Lediglich bei der Standardschriftqualität S2 entspricht das abgedruckte Zeichen einer optisch guten lesbaren Form.. Die Darstellung des Zeichens in der Entwurfsschriftqualität S1 weist dagegen eine deutliche Punktstruktur auf, und bei der Darstellung des Zeichens in der Schönschriftqualität S3 besteht die Neigung, daß durch ein Verfließen der übereinanderliegenden Tintenpunkte das Zeichen verwaschene und verschwommene Konturen aufweist.Only in the case of the standard font quality S2 does the printed character correspond to an optically well readable form. The representation of the character in the draft font quality S1, on the other hand, has a clear dot structure, and when the character is represented in the fine font quality S3 there is a tendency that the blurring of the superimposed dots of ink have blurred and blurred outlines.

Fig. 2 zeigt die Darstellung des Zeichens "L" unter Berücksichtigung der erfindungsgemäßen Lehre. Die Größe der auf den Aufzeichnungsträger aufgebrachten Tintentröpfchen, d.h. das Volumen jedes einzelnen Tintentröpfchens ist dabei abhängig von der Art der gewählten Schriftqualität verändert. Die auf der linken Seite in Fig. 3 dargestellte Düsenplatte DP mit den sieben Austrittsöffnungen der Düsen Dl bis D7 entspricht der in Fig. 1 gezeigten Düsenplatte. Zur Darstellung des Zeichens "L" in der Entwurfsschriftqualität 51 werden jeweils Tintentröpfchen mit einem relativ großen Tintenvolumen ausgestoßen, so daß die Durchmesser dl der auf den Aufzeichnungsträger aufgebrachten Tintenpunkte derart ist, daß sich die einzelnen Tintenpunkte, z.B. wie in Fig. 2 dargestellt, berühren. Es liegt jedoch auch im Rahmen der Erfindung, die Durchmesser der Tintenpunkte derart zu wählen, daß sich die Tintenpunkte auf dem Aufzeichnungsträger überlappen.Fig. 2 shows the representation of the character "L" taking into account the teaching of the invention. The size of the ink droplets applied to the recording medium, ie the volume of each individual ink droplet, is changed depending on the type of font quality selected. The nozzle plate DP shown on the left in FIG. 3 with the seven outlet openings of the nozzles D1 to D7 corresponds to that shown in FIG. 1 th nozzle plate. To represent the character "L" in draft font quality 51, ink droplets with a relatively large volume of ink are ejected, so that the diameter d1 of the ink dots applied to the recording medium is such that the individual ink dots touch, for example as shown in FIG . However, it is also within the scope of the invention to choose the diameter of the ink dots such that the ink dots overlap on the recording medium.

Wird die Standardschriftqualität S2 gewählt, so wird das mit jedem Tintentröpfchen ausgestoßene Tintenvolumen gegenüber der Entwurfsschriftqualität 51 reduziert. Die für diese Standardschriftqualität auf den Aufzeichnungsträger aufgetragenen Tintenpunkte haben einen Durchmesser d2, der geringer ist als der Durchmesser d1. Es entsteht auf diese Weise das mit dem Bezugszeichen 52 versehene Zeichen "L".If the standard font quality S2 is selected, the volume of ink ejected with each ink droplet is reduced compared to the design font quality 51. The ink dots applied to the recording medium for this standard font quality have a diameter d2 which is smaller than the diameter d1. In this way, the character "L" provided with the reference symbol 52 is formed.

Wird die Schönschriftqualität gewählt, so wird das Tintenvolumen, das mit jedem Tintentröpfchen ausgestoßen wird, noch einmal reduziert. Die auf den Aufzeichnungsträger aufgetragenen Tintenpunkte besitzen dann jeweils einen Durchmesser d3, der wiederum kleiner ist als der Durchmesser d2. Es entsteht auf diese Weise das in Fig. 3 mit dem Bezugszeichen S3 versehene Zeichen "L".If the fine writing quality is selected, the volume of ink that is ejected with each ink droplet is reduced again. The ink dots applied to the recording medium then each have a diameter d3, which in turn is smaller than the diameter d2. In this way, the character "L" provided with the reference symbol S3 in FIG. 3 is produced.

Man erkennt, daß bei allen drei Schriftqualitäten die Linienzüge des dargestellten Schriftzeichens eine geschlossene Form bilden, und daß darüber hinaus auch bei überlappenden Tintenpunkten auf dem Aufzeichnungsträger infolge der Reduzierung des Durchmessers der einzelnen Tintentröpfchen die äußeren Konturen der Zeichen schärfer sind. Insgesamt ist der optische Eindruck bei jeder der gewählten Schriftqualitäten deutlich verbessert.It can be seen that the lines of the character shown form a closed form in all three font qualities, and that, in addition, the outer contours of the characters are sharper even when the ink dots overlap on the recording medium due to the reduction in the diameter of the individual ink droplets. Overall, the visual impression is significantly improved with each of the selected font qualities.

Ein Beispiel für eine Tintenschreibeinrichtung, bei der die erfindungsgemäße Lehre angewendet werden kann, zeigt Fig. 3. Im wesentlichen besteht die Tintenschreibeinrichtung aus dem eigentlichen Tintendruckkopf K, der z.B. ein Kunststoffkörper ist, der eine Mehrzahl von Tintenkanälen enthält, die in Richtung auf den Aufzeichnungsträger P an der Düsenplatte DP enden. Jedem Tintenkanal ist ein hier nicht dargestellter Wandler zugeordnet, der über eine elektronische Steuerung ST impulsweise ansteuerbar ist. In Abhängigkeit von einem Ansteuerimpuls findet eine Verformung des Wandlers statt, die zum Ausstoß eines einzelnen Tintentröpfchens führt. Die Bildung der Ansteuerimpulse erfolgt entsprechend den Signalen, die von einem Zeichengenerator ZG abgegeben werden. Dieser enthält die zur Darstellung von Zeichen notwendigen Muster, die entsprechend den Eingabedaten ED aufgerufen werden. Der Steuerschaltung ST stehen darüber hinaus die Eingangssignale Sl, S2 und S3 zur Verfügung, die entsprechend der gewählten Schriftqualität abgegeben werden. Die Eingabe der Signale Sl, S2 und S3 kann beispielsweis mittels manuell betätigbarer Schalter geschehen. Abhängig von den Steuersignalen 51, S2 und S3 wird in der Steuerschaltung ST das der entsprechenden Schriftqualität entsprechende Matrixmuster festgelegt und die Aktivierung der Wandler wird entsprechend dem gewählten Matrixmuster bestimmt. Zugleich werden über die Steuerschaltung ST auch die Signale für die Bewegung des Tintendruckkopfes K und des Aufzeichnungsträgers P abgegeben. Dazu sind zwei Antriebseinrichtungen, nämlich ein erster Motor MI für die Bewegung des Tintendruckkopfes K und ein zweiter Motor M2 für die Bewegung des Aufzeichnungsträgers P vorgesehen. Über den ersten Motor M1 wird der Tintendruckkopf zeilenweise, also horizontal längs einer Zeile über den Aufzeichnungsträger P bewegt. Der zweite Motor M2 dient zum zeilenweisen Transport des Aufzeichnungsträger P. Darüber hinaus übernimmt der Motor M2 auch den um einen halben Zeilenabstand versetzten Transport des Aufzeichnungsträgers für die Darstellung eines Zeichens in Sehönschriftqualität.An example of an ink writing device in which the teaching according to the invention can be applied is shown in FIG. 3. Essentially, the ink writing device consists of the actual ink print head K, which is, for example, a plastic body which contains a plurality of ink channels which point in the direction of the recording medium P end at the nozzle plate DP. A transducer (not shown here) is assigned to each ink channel and can be controlled in pulses by means of an electronic control ST. Depending on a drive pulse, the transducer is deformed, which leads to the ejection of a single droplet of ink. The control pulses are formed in accordance with the signals which are emitted by a character generator ZG. This contains the patterns necessary for the representation of characters, which are called up in accordance with the input data ED. The control circuit ST also has the input signals S1, S2 and S3 available, which are output in accordance with the selected font quality. The signals S1, S2 and S3 can be input, for example, by means of manually operated switches. Depending on the control signals 51, S2 and S3, the matrix pattern corresponding to the corresponding font quality is defined in the control circuit ST and the activation of the transducers is determined according to the selected matrix pattern. At the same time, the signals for the movement of the ink print head K and the recording medium P are also emitted via the control circuit ST. For this purpose, two drive devices, namely a first motor MI for moving the ink print head K and a second motor M2 for moving the recording medium P, are provided. The ink print head is moved line by line, that is to say horizontally, along the line over the recording medium P via the first motor M1. The second motor M2 is used for line-by-line transport of the recording medium P. In addition, the motor M2 also takes over the transport offset by half a line spacing of the record carrier for the representation of a character in visual lettering quality.

Claims (4)

1. Tintenschreibeinrichtung mit einem Druckkopf, dessen mit den Austrittsöffnungen auf den Aufzeichnungsträger gerichteten Tintenkanäle jeweils ein Wandlerelement zugeordnet ist, das durch in einer Steuerschaltung entsprechend den darzustellenden Zeichen oder Mustern gebildeten Ansteuerimpulsen einen tröpfchenweisen Ausstoß von Tinte bewirkt, mit Antriebsvorrichtungen für den Druckkopf und für den Aufzeichnungsträger, um eine Relativbewegung zwischen Druckkopf und Aufzeichnungsträger zu erzeugen, wobei die Zeichen oder grafischen Muster auf dem Aufzeichnungsträger zur Darstellung der Zeichen oder grafischen Muster mit verschiedener Schriftqualität die den einzelnen Zeichen oder grafischen Mustern zugeordnete Matrix verändert ist,
dadurch gekennzeichnet, daß die Steuerschaltung (ST) in Abhängigkeit von Signalen (Sl,S2, S3) für unterschiedliche Schriftqualitäten die Kriterien für die Ansteuerimpulse derart ändert, daß das Volumen der einzelnen gegen den Aufzeichnungsträger (P) gespritzten Tintentröpfchen entsprechend der Schriftqualität einstellbar ist.1.Ink writing device with a printhead, whose respective ink channels directed to the outlet openings on the recording medium are assigned a transducer element which, by means of control pulses formed in a control circuit in accordance with the characters or patterns to be represented, causes droplet ejection of ink, with drive devices for the printhead and for the Record carrier in order to generate a relative movement between the print head and the record carrier, the characters or graphic patterns on the record carrier being changed to represent the characters or graphic patterns with different font quality, the matrix assigned to the individual characters or graphic patterns,
characterized in that the control circuit (ST) changes the criteria for the control pulses as a function of signals (S1, S2, S3) for different font qualities such that the volume of the individual ink droplets sprayed against the recording medium (P) can be adjusted according to the font quality. 2. Tintenschreibeinrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß in der Steuerschaltung (ST) in Abhängigkeit von den Signalen (Sl,S2,S3) für unterschiedliche Schriftqualität die Amplitude der Steuerimpulse einstellbar ist, und daß das Volumen eines Tröpfchens und damit der Durchmesser (dl,d2,d3) eines Bildpunktes auf dem Aufzeichnungsträger (P) bei der Betriebsart Entwurfsqualität am größten, bei der Betriebsart Schönschrift am kleinsten ist.2. Ink writing device according to claim 1,
characterized in that in the control circuit (ST) depending on the signals (Sl, S2, S3) for different font quality the amplitude of the control pulses is adjustable, and that the volume of a droplet and thus the diameter (dl, d2, d3) one Pixel on the record carrier (P) is the greatest in the draft quality mode and the smallest in the fine print mode. 3. Tintenschreibeinrichtung nach Anspruch 1,
dadurch gekennzeichnet , daß die Steuerschaltung (S) die Größe der ausgestoßenen Tintentröpfchen und damit den Durchmesser (dl,d2,d3) der Tintenpunkte auf dem Aufzeichnungsträger (P) in Abhängigkeit der Steuersignale (S1,S2,53) durch eine Änderung der Dauer der an die Wandler des Schreibkopfes (SK) abgegebenen Ansteuerimpulse einstellt.3. Ink writing device according to claim 1,
characterized in that the control circuit (S) the size of the ejected ink droplets and thus the diameter (dl, d2, d3) of the ink dots on the recording medium (P) as a function of the control signals (S1, S2,53) by changing the duration of the sets drive pulses delivered to the transducers of the write head (SK). 4. Tintenschreibeinrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet , daß der durch die Steuersignale (S1,S2,S3) einstellbare Durchmesser (dl,d2,d3) der auf den Aufzeichnungsträger (P) aufgebrachten Tintenpunkte für jede gewählte Schriftqualität derart ist, daß sich die Tintenpunkte in der für die gewählte Schriftqualität vorgegebenen Matrix (x,y) auf dem Aufzeichnungsträger (P) jeweils mindestens berühren.4. Ink writing device according to claim 3 or 4, characterized in that by the control signals (S1, S2, S3) adjustable diameter (dl, d2, d3) of the ink dots applied to the recording medium (P) for each selected font quality is such that the ink dots in the matrix (x, y) specified for the selected font quality on the recording medium (P) at least touch each other.
EP84115424A 1984-04-27 1984-12-14 Ink recording device with variable character quality Expired EP0159402B1 (en)

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DE3415787 1984-04-27
DE3415787 1984-04-27

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US4803500A (en) * 1986-07-04 1989-02-07 Siemens Aktiengesellschaft Ink printer means comprising interchangeable ink heads
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DE4012355A1 (en) * 1989-04-28 1990-10-31 Siemens Ag Control of print head for printing images, esp. laser print head - enabling approximately constant line thickness using interpolation of line segments with very small displacement units
DE4004543A1 (en) * 1990-02-14 1991-08-22 Siemens Ag Ink jet printing method for smooth foil - providing relative offset between individual points in successive raster lines
EP0588616A1 (en) * 1992-09-18 1994-03-23 Canon Kabushiki Kaisha Recording apparatus
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EP1294578B2 (en) † 2000-06-26 2018-10-17 Interglarion Limited Method for the production of components with a pre-determined surface appearance, in particular for front panels of kitchen units
WO2012064476A1 (en) * 2010-11-11 2012-05-18 Eastman Kodak Company Multiple resolution continuous ink jet system

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EP0159402B1 (en) 1989-03-01
DE3476860D1 (en) 1989-04-06

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