EP2049336B1 - Measuring element for measuring a colour register and method for colour register regulation or colour register measurement - Google Patents

Measuring element for measuring a colour register and method for colour register regulation or colour register measurement Download PDF

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Publication number
EP2049336B1
EP2049336B1 EP07786003A EP07786003A EP2049336B1 EP 2049336 B1 EP2049336 B1 EP 2049336B1 EP 07786003 A EP07786003 A EP 07786003A EP 07786003 A EP07786003 A EP 07786003A EP 2049336 B1 EP2049336 B1 EP 2049336B1
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EP
European Patent Office
Prior art keywords
measuring element
frequency
part measuring
pattern
optical density
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Not-in-force
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EP07786003A
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German (de)
French (fr)
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EP2049336A1 (en
Inventor
Helmut Schild
Andreas Lippold
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Manroland AG
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Manroland AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/52—Marks on printed material for registering

Definitions

  • the invention relates to a measuring element for measuring a color register. Furthermore, the invention relates to a method for color register control and color register measurement.
  • a substrate such as e.g. a printing sheet, successively moved by a plurality of successively arranged printing units, preferably in each of the printing units, a partial printing image is applied in a special ink on the substrate.
  • the substrate is preferably moved through four successive arranged printing units, wherein in each of the printing units, a partial printing image in the printing inks cyan, magenta, yellow and black is applied to the substrate.
  • a color register controller includes a circumferential register adjusting means for compensating for circumferential displacement of the partial printing images, a side register adjusting means for compensating for displacement of the partial printing images in the axial direction of the printing cylinders, and a skew register adjusting means for compensating rotational misalignments of the partial printing images.
  • the positional accuracy of the partial printing images on the substrate or the color register of the partial printing images must be detected by measurement, with this purpose serve measuring elements that are printed on the substrate.
  • From the DE 39 15 587 C1 are measuring elements for measuring a color register or a passport and a method for determining the positional accuracy of partial printing images on a substrate known, wherein according to the DE 39 15 587 C1 the positional accuracy of partial print images is detected by printing two identical measuring elements on a printing substrate and evaluating the correlation between them, the positional accuracy of the partial printed images being greater the higher the correlation between the two identical measuring elements.
  • a mark for detecting the register error or registration error in multi-color printing known.
  • the marking has a plurality of parallel spaced straight bars of equal width, which are printed with at least two partial colors one above the other.
  • the evaluation of the area coverage is based on a reference standard in which the marking is printed in one color and in which the bars occupy a certain area proportion of the bar field.
  • the perfect overprinting of the partial colors does not change the area proportion.
  • the area ratio of the bars increases, which is recorded with a measuring device and stored as a measure of error. For this purpose, the offset of the bars is measured and assigned to the resulting surface enlargement.
  • the present invention is based on the problem of creating a novel measuring element for measuring a color register and a novel method for color register control or color register measurement.
  • the measuring element according to the invention for measuring a color register is composed of at least two partial measuring elements which are printed one above the other on the printing material.
  • the partial measuring elements each have an at least one-dimensional pattern of repeating regions of different optical density or area coverage, wherein the partial measuring elements have different frequencies with which these regions repeat themselves. These frequencies can be constant or variable seen over the size of the sub-measuring elements.
  • the overprinting of such partial measuring elements results in an interference, which serves as a measured variable for the positional accuracy of the partial pressure images, which are applied to the printing material with the aid of the printing units involved in the compression of the measuring element.
  • the main advantage of the measuring element according to the invention is that even then the accuracy of the color register or register can be determined with a high resolution if the camera used to detect the measuring element has only a low resolution.
  • the measuring element according to the invention makes use of a vernier effect in order to increase the resolution of the camera used for scanning the measuring element.
  • the present invention relates to a measuring element for determining the positional accuracy of printed on a substrate on one another printed Opera Kunststoffe, so for determining the accuracy of the color register or passport, wherein a determined hereby actual value for color register control can be used in that the actual value is compared with a target value and dependent on this comparison, manipulated variables for register adjustment devices are generated.
  • Fig. 1 to 3 visualize a first embodiment of the present invention, wherein Fig. 1 shows a measuring element 20, which is formed of two partial printed part measuring elements. Each of the two sub-measuring elements is generated via an individual printing unit, wherein in the embodiment of the Fig. 1 to 3 each of the two sub-measuring elements has a one-dimensional pattern of repeating regions with different optical density or different area coverage. The frequency of the two partial measuring elements, with which the areas of different optical density or different area coverage repeat, is different, so that the overprint of these two partial printed images results in an interference which serves as a measured variable for the color register or the register.
  • Fig. 3 shows a partial measuring element 21 with a one-dimensional pattern of repetitive areas of different optical density or different area coverage, these areas is a bar sequence having a certain frequency.
  • FIG. 2 shows Fig. 2 a measuring element 22, which analogous to the measuring element 20 of the Fig. 1 is constructed, but in which the increase of the optical density or area coverage generated by the interference is not in the center of the measuring element 22, but rather is shifted to the left.
  • This serves as a measured variable for the fact that the partial printed images of the printing units which are involved in the printing of the measuring element 20 have a misalignment in the direction in which the one-dimensional pattern of the partial measuring elements of the measuring element 22 periodically repeats.
  • the measuring elements 20 and 22 include the Fig. 1 and 2 two partially printed sub-measuring elements, wherein a first part measuring element has a first one-dimensional pattern of frequency repeating regions of different optical density or different area coverage, wherein a second sub-measuring element a second one-dimensional pattern of frequency repeating areas with different optical density or having different area coverage, and wherein the frequencies of the two one-dimensional patterns are different.
  • the one-dimensional patterns are according to Fig. 1 around bars.
  • the frequency f 2 of the second one-dimensional pattern of the second Operamesselements is determined depending on the size of the measuring element, in such a way that the size of the measuring element of the wavelength ⁇ 1 of the interference of the two patterns corresponds, the frequency f 1 of the interference of the difference Frequencies f 1 and f 2 of the two one-dimensional pattern corresponds.
  • the positional accuracy of two partial printing images can be determined in one direction, in the direction in which the pattern of the one-dimensional partial measuring elements repeats periodically. Accordingly, with such a measuring element, depending on the direction in which the same is printed on a printing material, the positional accuracy of two partial printing images and thus two printing units can be detected either in the circumferential direction or in the axial direction of the printing cylinder.
  • Fig. 1 to 3 is the frequency f 1 of the first one-dimensional pattern of the first Partmesselements and the frequency f 2 of the second one-dimensional pattern of the second Partmesselements over the size or extent of the partial measuring elements seen constant.
  • these frequencies can also be variable over the size or extension of the partial measuring elements.
  • these frequencies can be dimensioned differently in the middle of the partial measuring element than at the edges of the partial measuring elements.
  • the achievable resolution can be adapted to the size of the deviation to be measured, preferably such that the smaller the deviation to be measured, the greater the resolution.
  • Fig. 4 shows a second embodiment of a measuring element 23 according to the invention, which consists of the in FIGS. 5 and 6 shown partial measuring elements 24 and 25 composed.
  • the two partial measuring elements 24 and 25 according to FIGS. 5 and 6 in turn have a one-dimensional pattern of repeating with an individual frequency ranges of different optical density or different area coverage, which are designed as a bar series, for better visual recognition of the accuracy of the color register or passers some of the bars are extended, namely in the partial measuring element 24th of the Fig. 5 the two middle bars and the partial measuring element 25 of the Fig. 6 the middle bar.
  • Fig. 7, 8 show measuring elements according to the invention 26 and 27, each consisting of two sub-printed part measuring elements, each of the partial measuring elements has a two-dimensional pattern of repeating in two linearly independent directions areas of different optical density and different area coverage.
  • Fig. 9 shows such a partial measuring element 28 which is formed like a checkerboard and in a first direction, a pattern of repetitive areas with different optical density or different optical surface coverage and in a second, perpendicular direction also a pattern of areas with different optical density or different Has area coverage.
  • Fig. 9 are the frequencies in which the areas of different optical density or different area coverage repeat in the two directions of the Operamesselements 28, the same size. However, these frequencies can also be different in size.
  • the size of Operamesselements 28 in both directions the same size. Again, however, the size of the Detailmesselements 28 may differ from each other in both directions.
  • the increase in the optical density caused by the interference is offset relative to the center of the measuring element 27.
  • An interference generated by the overprinting of two partial measuring elements can also bring about a reduction of the optical density or area coverage.
  • the position of the interference in the measuring element in turn serves as a measured variable for the positional accuracy of the partial pressure images and thus as a measured variable for the color register or the register, wherein with a measuring element according to Fig. 7 or 8, the positional accuracy in two directions, namely in the circumferential direction and in the axial direction of the impression cylinder, can be determined simultaneously.
  • the partial measuring element 28 of the Fig. 9 the frequency with which repeat the areas of different optical density or area coverage in the linearly independent directions, the same size. However, these frequencies can also be different in size.
  • FIGS. 10 and 11 show further embodiments of measuring elements according to the invention, which consist of two partial printed sub-elements with a two-dimensional pattern of repeating regions of different optical density or area coverage, wherein Fig. 12 such a partial measuring element 31 shows.
  • the partial measuring element 31 of the Fig. 12 has as well as the partial measuring element 28 of the Fig. 9 Repeating areas of different optical density or different area coverage in two linearly independent directions, so that therefore to avoid unnecessary repetition of the comments to Fig. 7 to 9 can be referenced. If two partial measuring elements according to Fig. 12 that are different in terms of the frequencies of the repeating regions of different optical density or different area coverages, printed on one another, again resulting in interference, which lead to an increase in the optical density in the region of interference, wherein Fig. 10 the interference in the middle of the measuring element 29 and in Fig. 11 the interference is offset from the center of the measuring element 30.
  • a density distribution for the measuring elements For the purposes of the invention, it is possible to detect a density distribution for the measuring elements. Such a density distribution consists of discrete values. An interpolation can be used to determine an at least one-dimensional function of the density distribution, from which the position of the interference can be calculated.

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  • Spectrometry And Color Measurement (AREA)

Abstract

The invention relates to a measuring element (20;22;26;27;29;30) for measuring a colour register, having at least two part measuring elements (21;24;25;28;31) which are printed over one another, wherein each part measuring element (21;24;25;28;31) is produced with an individual printing unit, wherein each part measuring element (21;24;25;28;31) has an at least one-dimensional pattern comprising repeating regions having a different optical density or a different area coverage, and wherein printing said part measuring elements (21;24;25;28;31) over one another produces an interference which serves as measuring variable for the colour register.

Description

Die Erfindung betrifft ein Messelement zur Messung eines Farbregisters. Des Weiteren betrifft die Erfindung ein Verfahren zur Farbregisterregelung sowie Farbregistermessung.The invention relates to a measuring element for measuring a color register. Furthermore, the invention relates to a method for color register control and color register measurement.

In Druckmaschinen, wie z.B. in Bogendruckmaschinen, wird ein Bedruckstoff, wie z.B. ein Druckbogen, nacheinander durch mehrere hintereinander angeordnete Druckwerke bewegt, wobei vorzugsweise in jedem der Druckwerke ein Teildruckbild in einer speziellen Druckfarbe auf den Bedruckstoff aufgetragen wird. Durch das Übereinanderdrucken mehrerer solcher Teildruckbilder wird letztendlich das gewünschte, mehrfarbige Druckbild auf dem Bedruckstoff erzeugt. Im Falle des autotypischen Zusammendrucks wird der Bedruckstoff vorzugsweise durch vier hintereinander angeordnete Druckwerke bewegt, wobei in jedem der Druckwerke ein Teildruckbild in den Druckfarben Cyan, Magenta, Gelb und Schwarz auf den Bedruckstoff aufgetragen wird. Beim Drucken mehrfarbiger Druckbilder müssen demnach verschiedene Teildruckbilder miteinander zur Deckung gebracht werden, wobei die Lagegenauigkeit der Teildruckbilder auf dem Bedruckstoff zueinander als Farbregister bzw. als Passer bezeichnet wird.In printing machines, such as in sheetfed presses, a substrate such as e.g. a printing sheet, successively moved by a plurality of successively arranged printing units, preferably in each of the printing units, a partial printing image is applied in a special ink on the substrate. By overprinting several such partial print images ultimately the desired multi-color print image is generated on the substrate. In the case of autotypic Zusammendrucks the substrate is preferably moved through four successive arranged printing units, wherein in each of the printing units, a partial printing image in the printing inks cyan, magenta, yellow and black is applied to the substrate. Accordingly, when printing multicolor print images, various partial print images must be made coincident with each other, and the registration accuracy of the partial print images on the print material is referred to each other as a color register or a passer.

Um die in den unterschiedlichen Druckwerken zu druckenden Teildruckbilder auf den Bedruckstoff exakt auftragen zu können, verfügt nach dem Stand der Technik eine Druckmaschine über eine sogenannte Farbregisterregelung. Eine Farbregisterregelung umfasst eine Umfangsregisterverstelleinrichtung, um eine Verschiebung der Teildruckbilder in Umfangsrichtung ausgleichen, eine Seitenregisterverstelleinrichtung, um eine Verschiebung der Teildruckbilder in Achsrichtung der Druckzylinder auszugleichen, und eine Schrägregisterverstelleinrichtungen, um Drehfehllagen der Teildruckbilder zu kompensieren.In order to be able to apply the partial printing images to be printed in the different printing units exactly to the printing material, according to the state of the art a printing press has a so-called color register control. A color register controller includes a circumferential register adjusting means for compensating for circumferential displacement of the partial printing images, a side register adjusting means for compensating for displacement of the partial printing images in the axial direction of the printing cylinders, and a skew register adjusting means for compensating rotational misalignments of the partial printing images.

Hierzu muss die Lagegenauigkeit der Teildruckbilder auf dem Bedruckstoff bzw. das Farbregister der Teildruckbilder messtechnisch erfasst werden, wobei hierzu Messelemente dienen, die auf den Bedruckstoff gedruckt werden.For this purpose, the positional accuracy of the partial printing images on the substrate or the color register of the partial printing images must be detected by measurement, with this purpose serve measuring elements that are printed on the substrate.

Aus der DE 39 15 587 C1 sind Messelemente zur Messung eines Farbregisters bzw. Passers sowie ein Verfahren zur Bestimmung der Lagegenauigkeit von Teildruckbildern auf einem Bedruckstoff bekannt, wobei nach der DE 39 15 587 C1 die Lagegenauigkeit von Teildruckbildern dadurch erfasst wird, dass zwei identische Messelemente auf einem Bedruckstoff gedruckt und die Korrelation zwischen denselben ausgewertet wird, wobei die Lagegenauigkeit der Teildruckbilder zueinander um so größer ist, je höher die Korrelation zwischen den beiden identischen Messelementen ist. Hierzu ist die Verwendung einer sehr hoch auflösenden Kamera erforderlich, damit das von der Kamera erfasste Signal eine entsprechend große Schärfe aufweist, die es ermöglicht, die Korrelation zwischen den beiden identischen Messelementen zu berechnen.From the DE 39 15 587 C1 are measuring elements for measuring a color register or a passport and a method for determining the positional accuracy of partial printing images on a substrate known, wherein according to the DE 39 15 587 C1 the positional accuracy of partial print images is detected by printing two identical measuring elements on a printing substrate and evaluating the correlation between them, the positional accuracy of the partial printed images being greater the higher the correlation between the two identical measuring elements. This requires the use of a very high-resolution camera, so that the signal captured by the camera has a correspondingly high sharpness, which makes it possible to calculate the correlation between the two identical measuring elements.

Weiterhin ist aus der DE 102 04 681 A1 eine Markierung zur Erfassung des Registerfehlers oder Passerfehlers im Mehrfarbendruck bekannt. Die Markierung hat mehrere parallel im Abstand angeordnete gerade Balken gleicher Breite, die mit wenigstens zwei Teilfarben übereinander gedruckt werden. Zur Auswertung der Flächendeckung wird von einem Referenzstandard ausgegangen, bei dem die Markierung in einer Farbe gedruckt ist und bei dem die Balken einen bestimmten Flächenanteil des Balkenfelds einnehmen. Beim perfekten Übereinanderdrucken der Teilfarben ändert sich der Flachenanteil nicht. Bei einem Registerfehler oder Passerfehler vergrößert sich der Flächenanteil der Balken, was mit einem Messgerät erfasst und als Fehlermaß gespeichert wird. Dazu wird der Versatz der Balken ausgemessen und der resultierenden Flachenvergrößerung zugeordnet.Furthermore, from the DE 102 04 681 A1 a mark for detecting the register error or registration error in multi-color printing known. The marking has a plurality of parallel spaced straight bars of equal width, which are printed with at least two partial colors one above the other. The evaluation of the area coverage is based on a reference standard in which the marking is printed in one color and in which the bars occupy a certain area proportion of the bar field. The perfect overprinting of the partial colors does not change the area proportion. In the case of a register error or registration error, the area ratio of the bars increases, which is recorded with a measuring device and stored as a measure of error. For this purpose, the offset of the bars is measured and assigned to the resulting surface enlargement.

Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zugrunde ein neuartiges Messelement zur Messung eines Farbregisters sowie ein neuartiges Verfahren zur Farbregisterregelung bzw. Farbregistermessung zu schaffen.On this basis, the present invention is based on the problem of creating a novel measuring element for measuring a color register and a novel method for color register control or color register measurement.

Dieses Problem wird durch ein Messelement zur Messung eines Farbregisters gemäß Ansprüche 1 und 2 und durch ein Verfahren gemäß Anspruch 13 gelöst.This problem is solved by a measuring element for measuring a color register according to claims 1 and 2 and by a method according to claim 13.

Das erfindungsgemäße Messelement zur Messung eines Farbregisters setzt sich aus mindestens zwei Teilmesselementen zusammen, die übereinander auf den Bedruckstoff gedruckt werden. Die Teilmesselemente verfügen jeweils über ein zumindest eindimensionales Muster aus sich wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. Flächendeckung, wobei die Teilmesselemente unterschiedliche Frequenzen aufweisen, mit welchen sich diese Bereiche wiederholen. Diese Frequenzen können dabei über die Größe der Teilmesselemente gesehen konstant oder variabel sein. Durch den Übereinanderdruck solcher Teilmesselemente ergibt sich eine Interferenz, die als Messgröße für die Lagegenauigkeit der Teildruckbilder dient, die mit Hilfe der am Zusammendruck des Messelements beteiligten Druckwerke auf den Bedruckstoff aufgetragen werden. Der Hauptvorteil des erfindungsgemäßen Messelements liegt darin, dass auch dann die Genauigkeit des Farbregisters bzw. Passers mit einer hohen Auflösung bestimmt werden kann, wenn die zur Erfassung des Messelements verwendete Kamera lediglich eine geringe Auflösung aufweist. Das erfindungsgemäße Messelement macht sich dabei einen Noniuseffekt zu Nutzen, um die Auflösung der zur Abtastung des Messelements verwendeten Kamera zu erhöhen.The measuring element according to the invention for measuring a color register is composed of at least two partial measuring elements which are printed one above the other on the printing material. The partial measuring elements each have an at least one-dimensional pattern of repeating regions of different optical density or area coverage, wherein the partial measuring elements have different frequencies with which these regions repeat themselves. These frequencies can be constant or variable seen over the size of the sub-measuring elements. The overprinting of such partial measuring elements results in an interference, which serves as a measured variable for the positional accuracy of the partial pressure images, which are applied to the printing material with the aid of the printing units involved in the compression of the measuring element. The main advantage of the measuring element according to the invention is that even then the accuracy of the color register or register can be determined with a high resolution if the camera used to detect the measuring element has only a low resolution. The measuring element according to the invention makes use of a vernier effect in order to increase the resolution of the camera used for scanning the measuring element.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:

Fig. 1:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein eindimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist;
Fig. 2:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein eindimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist;
Fig. 3:
ein Teilmesselement der Messelemente der Fig. 1 und 2;
Fig. 4:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein eindimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist
Fig. 5:
ein erstes Teilmesselement des Messelements der Fig. 4;
Fig. 6:
ein zweites Teilmesselement des Messelements der Fig. 4;
Fig. 7:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein zweidimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist;
Fig. 8:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein zweidimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist;
Fig. 9:
ein Teilmesselement der Messelemente der Fig. 7 und 8;
Fig. 10:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein zweidimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist;
Fig. 11:
ein erfindungsgemäßes Messelement aus zwei übereinander gedruckten Teilmesselementen, wobei jedes Teilmesselement ein zweidimensionales Muster aus sich mit einer individuellen Frequenz wiederholen- den Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist, und
Fig. 12:
ein Teilmesselement der Messelemente der Fig. 10 und 11.
Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1:
a measuring element according to the invention consisting of two sub-measuring elements printed on top of each other, each sub-measuring element having a one-dimensional pattern of regions with a different optical density or different area coverage repeating with an individual frequency;
Fig. 2:
a measuring element according to the invention consisting of two sub-measuring elements printed on top of each other, each sub-measuring element having a one-dimensional pattern of regions with a different optical density or different area coverage repeating with an individual frequency;
3:
a partial measuring element of the measuring elements of Fig. 1 and 2 ;
4:
a measuring element according to the invention of two sub-measuring elements printed on top of each other, wherein each sub-measuring element has a one-dimensional pattern of regions with a different optical density or different area coverage repeating with an individual frequency
Fig. 5:
a first partial measuring element of the measuring element of Fig. 4 ;
Fig. 6:
a second partial measuring element of the measuring element of Fig. 4 ;
Fig. 7:
a measuring element according to the invention comprising two sub-measuring elements printed on top of each other, each sub-measuring element having a two-dimensional pattern of regions with a different optical density or area coverage repeating an individual frequency;
Fig. 8:
a measuring element according to the invention comprising two sub-measuring elements printed on top of each other, each sub-measuring element having a two-dimensional pattern of regions with a different optical density or area coverage repeating an individual frequency;
Fig. 9:
a partial measuring element of the measuring elements of FIGS. 7 and 8 ;
Fig. 10:
a measuring element according to the invention comprising two sub-measuring elements printed on top of each other, each sub-measuring element having a two-dimensional pattern of regions with a different optical density or area coverage repeating an individual frequency;
Fig. 11:
a measuring element according to the invention comprising two sub-measuring elements printed on top of each other, each sub-measuring element repeating a two-dimensional pattern with an individual frequency. the areas with different optical density or different area coverage, and
Fig. 12:
a partial measuring element of the measuring elements of 10 and 11 ,

Die hier vorliegende Erfindung betrifft ein Messelement zur Ermittlung der Lagegenauigkeit von auf einen Bedruckstoff übereinander gedruckten Teildruckbildem, also zur Ermittlung der Genauigkeit des Farbregisters bzw. Passers, wobei ein hierbei ermittelter Istwert zur Farbregisterregelung dadurch verwendet werden kann, dass der Istwert mit einem Sollwert verglichen wird und abhängig von diesem Vergleich Stellgrößen für Registerverstelleinrichtungen generiert werden.The present invention relates to a measuring element for determining the positional accuracy of printed on a substrate on one another printed Teilbildbild, so for determining the accuracy of the color register or passport, wherein a determined hereby actual value for color register control can be used in that the actual value is compared with a target value and dependent on this comparison, manipulated variables for register adjustment devices are generated.

Fig. 1 bis 3 visualisieren ein erstes Ausführungsbeispiel der hier vorliegenden Erfindung, wobei Fig. 1 ein Messelement 20 zeigt, welches aus zwei übereinander gedruckten Teilmesselementen gebildet ist. Jedes der beiden Teilmesselemente wird über ein individuelles Druckwerk erzeugt, wobei im Ausführungsbeispiel der Fig. 1 bis 3 jedes der beiden Teilmesselemente ein eindimensionales Muster aus sich wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist. Die Frequenz der beiden Teilmesselemente, mit welchen sich die Bereiche unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung wiederholen, ist dabei unterschiedlich, so dass sich durch den Übereinanderdruck dieser beiden Teildruckbilder eine Interferenz ergibt, die als Messgröße für das Farbregister bzw. den Passer dient. Fig. 3 zeigt ein Teilmesselement 21 mit einem eindimensionalen Muster aus sich wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung, wobei es sich bei diesen Bereichen um eine Balkenfolge handelt, die eine bestimmte Frequenz aufweist. Fig. 1 to 3 visualize a first embodiment of the present invention, wherein Fig. 1 shows a measuring element 20, which is formed of two partial printed part measuring elements. Each of the two sub-measuring elements is generated via an individual printing unit, wherein in the embodiment of the Fig. 1 to 3 each of the two sub-measuring elements has a one-dimensional pattern of repeating regions with different optical density or different area coverage. The frequency of the two partial measuring elements, with which the areas of different optical density or different area coverage repeat, is different, so that the overprint of these two partial printed images results in an interference which serves as a measured variable for the color register or the register. Fig. 3 shows a partial measuring element 21 with a one-dimensional pattern of repetitive areas of different optical density or different area coverage, these areas is a bar sequence having a certain frequency.

Werden zwei solche Teilmesselemente mit einer unterschiedlichen Frequenz des als Balkenfolge ausgebildeten eindimensionalen Musters übereinander gedruckt, so ergibt sich z. B. dass in Fig. 1 dargestellte Messelement 20, wobei in Fig. 1 die durch den Übereinanderdruck der beiden Teilmesselemente erzeugte Interferenz in etwa in der Mitte des Messelements 20 eine Erhöhung der optischen Dichte bzw. Flächendeckung bewirkt. Eine durch den Übereinanderdruck zweier Teilmesselemente erzeugte Interferenz kann auch eine Verringerung der optischen Dichte bzw. Flächendeckung bewirken.If two such partial measuring elements with a different frequency of the one-dimensional pattern formed as a bar sequence are printed one above the other, then z. B. that in Fig. 1 illustrated measuring element 20, wherein in Fig. 1 the interference generated by the overprinting of the two partial measuring elements approximately in the middle of the measuring element 20, an increase in the optical density or area coverage causes. An interference generated by the overprinting of two partial measuring elements can also bring about a reduction of the optical density or area coverage.

Es soll davon ausgegangen werden, dass eine solche Erhöhung der optischen Dichte bzw. Flächendeckung in der Mitte des Messelements 20 einer hohen Genauigkeit des Farbregisters bzw. Passers in der Richtung entspricht, in welcher sich das eindimensionale Muster der Teilmesselemente periodisch wiederholt. In dieser Richtung liegen demnach die Teildruckbilder der Druckwerke, die am Druck des Messelements 20 beteiligt sind, exakt aufeinander.It should be understood that such an increase in the optical density in the center of the sensing element 20 corresponds to a high accuracy of the color register in the direction in which the one-dimensional pattern of the sub-sensing elements repeats periodically. In this direction, therefore, the partial printing images of the printing units, which are involved in the pressure of the measuring element 20, exactly to each other.

Demgegenüber zeigt Fig. 2 ein Messelement 22, welches analog zum Messelement 20 der Fig. 1 aufgebaut ist, bei welchem jedoch die durch die Interferenz erzeugte Erhöhung der optischen Dichte bzw. Flächendeckung nicht in der Mitte des Messelements 22 liegt, sondern vielmehr nach links verschoben ist. Dies dient dann als Messgröße dafür, dass die Teildruckbilder der Druckwerke, die am Druck des Messelements 20 beteiligt sind, in der Richtung, in welcher sich das eindimensionale Muster der Teilmesselemente des Messelements 22 periodisch wiederholt, eine Fehllage aufweist.In contrast, shows Fig. 2 a measuring element 22, which analogous to the measuring element 20 of the Fig. 1 is constructed, but in which the increase of the optical density or area coverage generated by the interference is not in the center of the measuring element 22, but rather is shifted to the left. This then serves as a measured variable for the fact that the partial printed images of the printing units which are involved in the printing of the measuring element 20 have a misalignment in the direction in which the one-dimensional pattern of the partial measuring elements of the measuring element 22 periodically repeats.

Wie bereits oben ausgeführt, umfassen die Messelemente 20 und 22 der Fig. 1 und 2 zwei übereinander gedruckte Teilmesselemente, wobei ein erstes Teilmesselement ein erstes eindimensionales Muster aus sich mit einer Frequenz wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist, wobei ein zweites Teilmesselement ein zweites eindimensionales Muster aus sich mit einer Frequenz wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist, und wobei die Frequenzen der beiden eindimensionalen Muster unterschiedlich sind. Bei den eindimensionalen Mustern handelt es sich gemäß Fig. 1 um Balkenfolgen.As already stated above, the measuring elements 20 and 22 include the Fig. 1 and 2 two partially printed sub-measuring elements, wherein a first part measuring element has a first one-dimensional pattern of frequency repeating regions of different optical density or different area coverage, wherein a second sub-measuring element a second one-dimensional pattern of frequency repeating areas with different optical density or having different area coverage, and wherein the frequencies of the two one-dimensional patterns are different. The one-dimensional patterns are according to Fig. 1 around bars.

Die beiden Frequenzen der beiden eindimensionalen Muster werden vorzugsweise derart festgelegt: Die Frequenz f1 des ersten eindimensionalen Musters des ersten Teilmesselements wird dadurch bestimmt, dass die Wellenlänge λ1 des ersten Musters der maximal zu messenden Abweichung des Farbregisters entspricht, wobei die Frequenz f1 des ersten eindimensionalen Musters dem Kehrwert der Wellenlänge λ1 des ersten eindimensionalen Musters entspricht. Für die Frequenz f1 des ersten eindimensionalen Musters gilt demnach: f 1 = 1 λ 1 ; wobei λ 1 = max Passerabweichung .

Figure imgb0001
The two frequencies of the two one-dimensional patterns are preferably determined such that the frequency f 1 of the first one-dimensional pattern of the first Teilmesselements is determined by the wavelength λ 1 of the first pattern corresponds to the maximum deviation of the color register to be measured, the frequency f 1 of first one-dimensional pattern corresponds to the reciprocal of the wavelength λ 1 of the first one-dimensional pattern. Accordingly, for the frequency f 1 of the first one-dimensional pattern: f 1 = 1 λ 1 ; in which λ 1 = Max register deviation ,
Figure imgb0001

Die Frequenz f2 des zweiten eindimensionalen Musters des zweiten Teilmesselements wird abhängig von der Größe des Messelements festgelegt, und zwar derart, dass die Größe des Messelements der Wellenlänge λ1 der Interferenz der beiden Muster entspricht, wobei die Frequenz f1 der Interferenz der Differenz der Frequenzen f1 und f2 der beiden eindimensionalen Muster entspricht. Für die Frequenz f2 des zweiten eindimensionalen Musters gilt demnach: f 2 = f 1 - f I ,

Figure imgb0002

und f 1 = 1 λ I ;
Figure imgb0003
wobei λ1 = Messelementgröße. The frequency f 2 of the second one-dimensional pattern of the second Teilmesselements is determined depending on the size of the measuring element, in such a way that the size of the measuring element of the wavelength λ 1 of the interference of the two patterns corresponds, the frequency f 1 of the interference of the difference Frequencies f 1 and f 2 of the two one-dimensional pattern corresponds. For the frequency f 2 of the second one-dimensional pattern, the following applies: f 2 = f 1 - f I .
Figure imgb0002
and f 1 = 1 λ I ;
Figure imgb0003
where λ 1 = measuring element size.

Mit einem solchen Messelement, welches aus dem Übereinanderdruck von zwei eindimensionalen Teilmesselementen gebildet ist, kann die Lagegenauigkeit von zwei Teildruckbildern in einer Richtung bestimmt werden, und zwar in der Richtung, in welcher sich das Muster der eindimensionalen Teilmesselemente periodisch wiederholt. Mit einem solchen Messelement kann demnach abhängig davon, in welche Richtung dasselbe auf einen Bedruckstoff gedruckt ist, die Lagegenauigkeit von zwei Teildruckbildern und damit zwei Druckwerken entweder in Umfangsrichtung oder in Achsrichtung der Druckzylinder erfasst werden.With such a measuring element, which is formed from the overprinting of two one-dimensional partial measuring elements, the positional accuracy of two partial printing images can be determined in one direction, in the direction in which the pattern of the one-dimensional partial measuring elements repeats periodically. Accordingly, with such a measuring element, depending on the direction in which the same is printed on a printing material, the positional accuracy of two partial printing images and thus two printing units can be detected either in the circumferential direction or in the axial direction of the printing cylinder.

Soll die Lagegenauigkeit dieser beiden Teildruckbilder sowohl in Umfangsrichtung als auch in Achsrichtung der Teildruckbilder erfasst werden, so müssen hierzu zwei derartige Messelemente auf den Bedruckstoff aufgedruckt werden, und zwar in unterschiedlichen Bereichen des Bedruckstoffs in voneinander linear unabhängigen Richtungen. Soll weiterhin eine Drehfehllage der Teildruckbilder erkannt werden, so müssen an sich gegenüberliegenden Seiten eines Bedruckstoffs entsprechende Messelemente auf den Bedruckstoff gedruckt werden.If the positional accuracy of these two partial printing images are to be recorded both in the circumferential direction and in the axial direction of the partial printing images, then two such measuring elements must be printed on the printing material, in different regions of the printing material in linearly independent directions. If, furthermore, a rotational misalignment of the partial printing images is to be detected, corresponding measuring elements must be printed on the printing material on opposite sides of a printing material.

Im Ausführungsbeispiel der Fig. 1 bis 3 ist die Frequenz f1 des ersten eindimensionalen Musters des ersten Teilmesselements sowie die Frequenz f2 des zweiten eindimensionalen Musters des zweiten Teilmesselements über die Größe bzw. Erstreckung der Teilmesselemente gesehen konstant. Es sei darauf hingewiesen, dass diese Frequenzen auch über die Größe bzw. Erstreckung der Teilmesselemente gesehen variabel sein können. So können z.B. in der Mitte der Teilmesselement diese Frequenzen anders bemessen sein als an Rändern der Teilmesselemente. In diesem Fall kann die erzielbare Auflösung an die Größe der zu messenden Abweichung angepasst werden, vorzugsweise derart, dass die Auflösung um so größer ist, je kleiner die zu messenden Abweichung ist.In the embodiment of Fig. 1 to 3 is the frequency f 1 of the first one-dimensional pattern of the first Teilmesselements and the frequency f 2 of the second one-dimensional pattern of the second Teilmesselements over the size or extent of the partial measuring elements seen constant. It should be noted that these frequencies can also be variable over the size or extension of the partial measuring elements. For example, these frequencies can be dimensioned differently in the middle of the partial measuring element than at the edges of the partial measuring elements. In this case, the achievable resolution can be adapted to the size of the deviation to be measured, preferably such that the smaller the deviation to be measured, the greater the resolution.

Fig. 4 zeigt ein zweites Ausführungsbeispiel eines erfindungsgemäßen Messelements 23, welches sich aus den in Fig. 5 und 6 dargestellten Teilmesselementen 24 und 25 zusammensetzt. Die beiden Teilmesselemente 24 und 25 gemäß Fig. 5 und 6 weisen wiederum ein eindimensionales Muster aus sich mit einer individuellen Frequenz wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung auf, die als Balkenfolgen ausgebildet sind, wobei zur besseren visuellen Erkennung der Genauigkeit des Farbregisters bzw. Passers einige der Balken verlängert sind, nämlich im Teilmesselement 24 der Fig. 5 die beiden mittleren Balken und im Teilmesselement 25 der Fig. 6 der mittlere Balken. Fig. 4 shows a second embodiment of a measuring element 23 according to the invention, which consists of the in FIGS. 5 and 6 shown partial measuring elements 24 and 25 composed. The two partial measuring elements 24 and 25 according to FIGS. 5 and 6 in turn have a one-dimensional pattern of repeating with an individual frequency ranges of different optical density or different area coverage, which are designed as a bar series, for better visual recognition of the accuracy of the color register or passers some of the bars are extended, namely in the partial measuring element 24th of the Fig. 5 the two middle bars and the partial measuring element 25 of the Fig. 6 the middle bar.

Liegt bei einem Übereinanderdruck der beiden Teilmesselemente 24 und 25 der Fig. 5 und 6 der mittlere Balken des Teilmesselements 25 zwischen den beiden mittleren Balken des Teilmesselements 24 (siehe Fig. 4), so liegen die entsprechenden Teildruckbilder in der Richtung, in welcher sich die Balken der beiden Teilmesselemente 24 und 25 periodisch wiederholen, exakt übereinander.Is in an overprint of the two sub-measuring elements 24 and 25 of the FIGS. 5 and 6 the middle bar of Teilmesselements 25 between the two middle bars of Teilmesselements 24 (see Fig. 4 ), so are the corresponding partial printing images in the direction in which repeat the bars of the two sub-measuring elements 24 and 25 periodically exactly above the other.

Fig. 7, 8 zeigen erfindungsgemäße Messelemente 26 und 27, die jeweils aus zwei übereinander gedruckten Teilmesselementen bestehen, wobei jedes der Teilmesselemente ein zweidimensionales Muster aus sich in zwei linear unabhängigen Richtungen wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist. Fig. 9 zeigt ein derartiges Teilmesselement 28, welches schachbrettartig ausgebildet ist und in einer ersten Richtung ein Muster aus sich wiederholenden Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher optischer Flächendeckung und in einer zweiten, senkrecht verlaufenden Richtung ebenfalls ein Muster aus Bereichen mit unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweist. In Fig. 9 sind die Frequenzen, in weichen sich die Bereiche unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung in den beiden Richtungen des Teilmesselements 28 wiederholen, gleich groß. Diese Frequenzen können jedoch auch unterschiedlich groß sein. Weiterhin ist in Fig. 9 die Größe des Teilmesselements 28 in beiden Richtungen gleich groß. Auch hier kann jedoch in beiden Richtungen die Größe des Teilmesselements 28 voneinander abweichen. Fig. 7, 8 show measuring elements according to the invention 26 and 27, each consisting of two sub-printed part measuring elements, each of the partial measuring elements has a two-dimensional pattern of repeating in two linearly independent directions areas of different optical density and different area coverage. Fig. 9 shows such a partial measuring element 28 which is formed like a checkerboard and in a first direction, a pattern of repetitive areas with different optical density or different optical surface coverage and in a second, perpendicular direction also a pattern of areas with different optical density or different Has area coverage. In Fig. 9 are the frequencies in which the areas of different optical density or different area coverage repeat in the two directions of the Teilmesselements 28, the same size. However, these frequencies can also be different in size. Furthermore, in Fig. 9 the size of Teilmesselements 28 in both directions the same size. Again, however, the size of the Teilmesselements 28 may differ from each other in both directions.

Werden zwei Teilmesselemente, die jeweils ein zweidimensionales Muster aus sich in zwei linear unabhängigen Richtungen wiederholenden Bereichen unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung aufweisen, wobei die Frequenzen der zweidimensionalen Muster der beiden Teilmesselemente voneinander abweichen, übereinander gedruckt, so ergeben sich wiederum Interferenzen, die als Messgröße für die Lagegenauigkeit der Teilmessbilder und damit als Messgröße für das Farbregister bzw. den Passer dienen.If two partial measuring elements each having a two-dimensional pattern of regions of different optical density or different area coverage repeating in two linearly independent directions, the frequencies of the two-dimensional patterns of the two partial measuring elements differing from one another, are printed one above the other, again resulting in interferences Measured variable for the positional accuracy of the partial measuring images and thus serve as a measured variable for the color register or the register.

Im Messelement 26 der Fig. 7 führt diese Interferenz zu einer Erhöhung der optischen Dichte in der Mitte des Messelements 26, in Fig. 8 ist hingegen die durch die Interferenz bewirkte Erhöhung der optischen Dichte gegenüber der Mitte des Messelements 27 versetzt. Eine durch den Übereinanderdruck zweier Teilmesselemente erzeugte Interferenz kann auch eine Verringerung der optischen Dichte bzw. Flächendeckung bewirken. Die Lage der Interferenz im Messelement dient wiederum als Messgröße für die Lagegenauigkeit der Teildruckbilder und damit als Messgröße für das Farbregister bzw. den Passer, wobei mit einem Messelement gemäß Fig. 7 bzw. 8 die Lagegenauigkeit in zwei Richtungen, nämlich in Umfangsrichtung sowie in Achsrichtung der Druckzylinder, gleichzeitig ermittelt werden kann.In the measuring element 26 of Fig. 7 This interference leads to an increase in the optical density in the middle of the measuring element 26, in FIG Fig. 8 On the other hand, the increase in the optical density caused by the interference is offset relative to the center of the measuring element 27. An interference generated by the overprinting of two partial measuring elements can also bring about a reduction of the optical density or area coverage. The position of the interference in the measuring element in turn serves as a measured variable for the positional accuracy of the partial pressure images and thus as a measured variable for the color register or the register, wherein with a measuring element according to Fig. 7 or 8, the positional accuracy in two directions, namely in the circumferential direction and in the axial direction of the impression cylinder, can be determined simultaneously.

Wie bereits ausgeführt, ist beim Teilmesselement 28 der Fig. 9 die Frequenz, mit welcher sich die Bereiche unterschiedlicher optischer Dichte bzw. Flächendeckung in den linear voneinander unabhängigen Richtungen wiederholen, gleich groß. Diese Frequenzen können jedoch auch unterschiedlich groß sein.As already stated, is the partial measuring element 28 of the Fig. 9 the frequency with which repeat the areas of different optical density or area coverage in the linearly independent directions, the same size. However, these frequencies can also be different in size.

Es muss lediglich darauf geachtet werden, dass in beiden Richtungen die zweidimensionalen Muster der übereinander zu druckenden Teilmesselemente unterschiedlich große Frequenzen aufweisen. Die Bemessung der Frequenzen in beiden Richtungen für die beiden Teilmesselemente kann analog zu der im Zusammenhang mit dem Ausführungsbeispiel der Fig. 1 bis 3 beschriebenen Vorgehensweise erfolgen.It only has to be ensured that the two-dimensional patterns of the sub-measuring elements to be printed on one another have different frequencies in both directions. The dimensioning of the frequencies in both directions for the two partial measuring elements can analogously to that in connection with the embodiment of Fig. 1 to 3 described procedure done.

Fig. 10 und 11 zeigen weitere Ausführungsbeispiele erfindungsgemäßer Messelemente, die aus zwei übereinander gedruckten Teilmesselementen mit einem zweidimensionalen Muster sich wiederholender Bereiche unterschiedlicher optischer Dichte bzw. Flächendeckung bestehen, wobei Fig. 12 ein derartiges Teilmesselement 31 zeigt. 10 and 11 show further embodiments of measuring elements according to the invention, which consist of two partial printed sub-elements with a two-dimensional pattern of repeating regions of different optical density or area coverage, wherein Fig. 12 such a partial measuring element 31 shows.

Das Teilmesselement 31 der Fig. 12 verfügt ebenso wie das Teilmesselement 28 der Fig. 9 über sich in zwei linear unabhängigen Richtungen wiederholende Bereiche unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckung, so dass demnach zur Vermeidung unnötiger Wiederholungen auf die Ausführungen zu Fig. 7 bis 9 verwiesen werden kann. Werden zwei Teilmesselemente gemäß Fig. 12, die sich hinsichtlich der Frequenzen der sich wiederholenden Bereiche unterschiedlicher optischer Dichte bzw. unterschiedlicher Flächendeckungen unterscheiden, übereinandergedruckt, so ergeben sich wiederum Interferenzen, die im Bereich der Interferenz zu einer Erhöhung der optischen Dichte führen, wobei in Fig. 10 die Interferenz in der Mitte des Messelements 29 und in Fig. 11 die Interferenz gegenüber der Mitte des Messelements 30 versetzt ist.The partial measuring element 31 of the Fig. 12 has as well as the partial measuring element 28 of the Fig. 9 Repeating areas of different optical density or different area coverage in two linearly independent directions, so that therefore to avoid unnecessary repetition of the comments to Fig. 7 to 9 can be referenced. If two partial measuring elements according to Fig. 12 that are different in terms of the frequencies of the repeating regions of different optical density or different area coverages, printed on one another, again resulting in interference, which lead to an increase in the optical density in the region of interference, wherein Fig. 10 the interference in the middle of the measuring element 29 and in Fig. 11 the interference is offset from the center of the measuring element 30.

Im Sinne der Erfindung ist es möglich, eine Dichteverteilung für die Messelemente zu erfassen. Eine solche Dichteverteilung besteht aus diskreten Werten. Über eine Interpolation lässt sich eine zumindest eindimensionale Funktion der Dichteverteilung bestimmen, aus der die Lage der Interferenz berechnet werden kann.For the purposes of the invention, it is possible to detect a density distribution for the measuring elements. Such a density distribution consists of discrete values. An interpolation can be used to determine an at least one-dimensional function of the density distribution, from which the position of the interference can be calculated.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

2020
Messelementmeasuring element
2121
TeilmesselementPart measuring element
2222
Messelementmeasuring element
2323
Messelementmeasuring element
2424
TeilmesselementPart measuring element
2525
TeilmesselementPart measuring element
2626
Messelementmeasuring element
2727
Messelementmeasuring element
2828
TeilmesselementPart measuring element
2929
Messelementmeasuring element
3030
Messelementmeasuring element
3131
TeilmesselementPart measuring element

Claims (13)

  1. A measuring element for measuring a colour register, with at least two part measuring elements (21, 25, 28, 31) printed on top of one another, wherein each part measuring element (21, 25, 28, 31) is generated with an individual printing couple, in which a part print image of a special printing colour each is applied, wherein each part measuring element (21, 25, 28, 31) comprises an at least unidimensional pattern of repetitive regions of different optical density or different area coverage, characterized in that the part measuring elements (21, 25, 28, 31) are so designed that upon printing on top of one another of these part measuring elements (21, 25, 28, 31) a measurable optical interference between the part measuring elements (21, 25, 28, 31) is created and in that the interference can be captured as measuring variable for the colour register, wherein a first part measuring element (21, 25, 28, 31) has a first unidimensional pattern of regions with different optical density or different area coverage which are repeated with a frequency, wherein a second part measuring element (21, 25, 28, 31) comprises a second unidimensional pattern of regions with different optical density or different area coverage which are repeated with a frequency, and wherein the frequencies of the two unidimensional patterns are different.
  2. The measuring element for measuring a colour register, with at least two part measuring elements (21, 25, 28, 31) printing on top of one another, wherein each part measuring element (21, 25, 28, 31) is created with an individual printing couple in which a part print image each of a special printing colour is applied, wherein each part measuring element (21, 25, 28, 31) comprises an at least unidimensional pattern of repeating regions of different optical density or different area coverage, characterized in that the part measuring elements (21, 25, 28, 31) are so designed that during the printing on top of one another of these part measuring elements (21, 25, 28, 31) a measurable optical interference between the part measuring elements (21, 25, 28, 31) is created, and in that the interference can be captured as measuring variable for the colour register,
    wherein a first part measuring element (21, 25, 28, 31) comprises a first two-dimensional pattern of regions with different optical density or different area coverage which are repeated in two linearly independent directions, wherein a second part measuring element (21, 25, 28, 31) comprises a second two-dimensional pattern of regions with different optical density or different area coverage which are repeated in two linearly independent directions.
  3. The measuring element according to Claim 2, characterized in that a frequency of the repetitive regions with different optical density or different area coverage in the first direction of the first two-dimensional pattern has the same magnitude as a frequency of the repetitive regions with different optical density or different area coverage in the second, linearly independent direction of the first two-dimensional pattern, in that a frequency of the repetitive regions with different optical density or different area coverage has the same magnitude in the first direction of the second two-dimensional pattern as a frequency of the repetitive regions with different optical density or different area coverage in the second, linearly independent direction of the second two-dimensional patter, and in that the frequency of the first two-dimensional pattern differs in magnitude from the frequency of the second two-dimensional pattern.
  4. The measuring element according to Claim 2, characterized in that a frequency of the repetitive regions with different optical density or different area coverage in the first direction of the first two-dimensional pattern has a magnitude that differs from a frequency of the repetitive regions with different optical density or different area coverage in the second, linearly independent direction of the first two-dimensional patter, in that a frequency of the repetitive regions with different optical density or different area coverage in the first direction of the second two-dimensional pattern differs in magnitude from a frequency of the repetitive regions with different optical density or different area coverage in the second, linearly independent direction of the second two-dimensional patter, and in that the frequencies of the first two-dimensional pattern differ in magnitude from the corresponding frequencies of the second two-dimensional pattern.
  5. The measuring element according to Claim 1, characterized in that the frequency of the first unidimensional pattern of the first part measuring element (21, 25, 28, 31) is fixed in such a manner that the wavelength of the first pattern corresponds to the maximum deviation of the colour register to be measured.
  6. The measuring element according to Claim 5, characterized in that the frequency of the second unidimensional pattern of the second part measuring element (21, 25, 28, 31) is fixed by the magnitude of the measuring element in such a manner that the magnitude of the measuring element corresponds to the wavelength of the interference from both patterns, wherein the frequency of the interference corresponds to the difference of the frequencies of the two patterns.
  7. The measuring element according to Claim 5 or 6, characterized in that in the frequencies of the first unidimensional pattern of the first part measuring element (21, 25, 28, 31) and of the second unidimensional pattern of the second part measuring element (21, 25, 28, 31) is constant seen over the magnitude of the part measuring elements.
  8. The measuring element according to Claim 5 to 6, characterized in that the frequency of the first unidimensional pattern of the first part measuring element (21, 25, 28, 31) and of the second unidimensional pattern of the second part measuring element (21, 25, 28, 31) is variable seen over the magnitude of the part measuring elements.
  9. The measuring element according to Claim 3 or 4, characterized in that the frequency of the first two-dimensional pattern of the first part measuring element (21, 25, 28, 31) is fixed in both linearly independent directions in such a manner that the wavelength of the first pattern corresponds to the maximum deviation of the colour register to be measured in the respective direction.
  10. The measuring element according to Claim 9, characterized in that the frequency of the second two-dimensional pattern of the second part measuring element (21, 25, 28, 31) in both linearly independent directions is fixed in the respective direction dependent on the magnitude of the measuring element in such a manner that the magnitude of the measuring element corresponds to the wavelength of the interference from both patterns, wherein the frequency of the interference corresponds to the difference of the frequencies of the two patterns.
  11. The measuring element according to Claim 9 or 10, characterized in that the frequency of the first two-dimensional pattern of the first part measuring element (21, 25, 28, 31) in both linearly independent directions and the frequency of the second two-dimensional pattern of the second part measuring element (21, 25, 28, 31) is constant in both linearly independent directions seen over the magnitude of the part measuring elements (21, 25, 28, 31).
  12. The measuring element according to Claim 9 or 10, characterized in that the frequency of the first two-dimensional pattern of the first part measuring element (21, 25, 28, 31) in at least one of the two linearly independent directions and the frequency of the second two-dimensional pattern of the second part measuring element (21, 25, 28, 31) in at least one of the two linearly independent directions is variable seen over the magnitude of the part measuring elements (21, 25, 28, 31).
  13. A method for the colour register closed-loop control or colour register measurement, with at least two part measuring elements (21, 25, 28, 31) printed on top of one another, wherein each part measuring element (21, 25, 28, 31) is created with an individual printing couple in which a part print image each of a special printing colour is applied, wherein each part measuring element (21, 25, 28, 31) comprises an at least unidimensional pattern of repetitive regions of different optical density or different area coverage, wherein at least two part measuring elements (21, 25, 28, 31) printed on a substrate on top of one another are measured, wherein during this the actual value of the colour register is measured and for the colour register closed-loop control is compared with a setpoint value, and wherein dependent on this comparison the colour register closed-loop control takes place, characterized in that a density distribution deviating from a uniform distribution for the or each measuring element formed of part measuring elements (21, 25, 28, 31) printed on top of one another is captured, which consists of discrete values, wherein by way of interpolation an at least unidimensional function of the density distribution is determined, from which the position of the interference is calculated.
EP07786003A 2006-08-04 2007-07-12 Measuring element for measuring a colour register and method for colour register regulation or colour register measurement Not-in-force EP2049336B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006036587A DE102006036587A1 (en) 2006-08-04 2006-08-04 Measuring element for measuring a color register and method for color register control or Farbregistermessung
PCT/EP2007/006171 WO2008014874A1 (en) 2006-08-04 2007-07-12 Measuring element for measuring a colour register and method for colour register regulation or colour register measurement

Publications (2)

Publication Number Publication Date
EP2049336A1 EP2049336A1 (en) 2009-04-22
EP2049336B1 true EP2049336B1 (en) 2011-12-07

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EP07786003A Not-in-force EP2049336B1 (en) 2006-08-04 2007-07-12 Measuring element for measuring a colour register and method for colour register regulation or colour register measurement

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EP (1) EP2049336B1 (en)
AT (1) ATE536261T1 (en)
DE (1) DE102006036587A1 (en)
WO (1) WO2008014874A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3103648A2 (en) 2015-06-12 2016-12-14 manroland web systems GmbH Printing in register onto transparent substrates

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DE102008025419A1 (en) * 2008-05-27 2009-12-03 Manroland Ag Method for color register measurement on a printing machine
DE102009050047A1 (en) 2008-11-13 2010-05-20 Heidelberger Druckmaschinen Ag Compact register mark
DE102011009791B4 (en) 2011-01-29 2016-02-04 Sächsisches Institut für die Druckindustrie GmbH - Institut des Vereins Polygraph Leipzig e.V. Measuring element for measuring any superimposed markings
DE102012104584A1 (en) * 2012-05-29 2013-12-05 Océ Printing Systems GmbH & Co. KG Method for controlling a color printer or color copier

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JPS585259A (en) * 1981-07-03 1983-01-12 Toppan Printing Co Ltd Registering method in printing
DE3915587C1 (en) * 1989-05-16 1990-11-08 Man Roland Druckmaschinen Ag, 6050 Offenbach, De Measurement element for multiple colour offset printing - determines match difference between two partial images independently of quality of image signal
DE69225659T2 (en) * 1991-09-24 1998-09-24 Raphael L Levien Alignment marks
US5857784A (en) * 1997-01-28 1999-01-12 Bayer Corp. Agfa Division Image position error detection technique
US6150231A (en) * 1998-06-15 2000-11-21 Siemens Aktiengesellschaft Overlay measurement technique using moire patterns
US6553906B1 (en) * 2000-10-17 2003-04-29 Nexpress Solutions Llc Method and apparatus for sensing a register discrepancy in a multi-color printed item, and register control system and register marks
DE10204681A1 (en) 2002-02-06 2003-08-07 Gerd Laubmann Marking for registration mark error detection has two part colors printed one over other
US6644773B2 (en) * 2002-03-15 2003-11-11 International Business Machines Corporation Method, system, and article of manufacture for performing registration calibration for printing devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3103648A2 (en) 2015-06-12 2016-12-14 manroland web systems GmbH Printing in register onto transparent substrates
DE102015109412A1 (en) 2015-06-12 2016-12-15 Manroland Web Systems Gmbh Registered printing of transparent substrates

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Publication number Publication date
EP2049336A1 (en) 2009-04-22
ATE536261T1 (en) 2011-12-15
DE102006036587A1 (en) 2008-02-07
WO2008014874A1 (en) 2008-02-07

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