EP0817955A1 - Procede de verification de dessins-modeles imprimes en couleur et dispositif de mise en uvre dudit procede - Google Patents

Procede de verification de dessins-modeles imprimes en couleur et dispositif de mise en uvre dudit procede

Info

Publication number
EP0817955A1
EP0817955A1 EP96908006A EP96908006A EP0817955A1 EP 0817955 A1 EP0817955 A1 EP 0817955A1 EP 96908006 A EP96908006 A EP 96908006A EP 96908006 A EP96908006 A EP 96908006A EP 0817955 A1 EP0817955 A1 EP 0817955A1
Authority
EP
European Patent Office
Prior art keywords
radiation sources
receiver
light
semiconductor radiation
semiconductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96908006A
Other languages
German (de)
English (en)
Inventor
Fritz Kurandt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
System Kurandt GmbH
Original Assignee
System Kurandt GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by System Kurandt GmbH filed Critical System Kurandt GmbH
Publication of EP0817955A1 publication Critical patent/EP0817955A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs

Definitions

  • the invention relates to a method for checking color printing templates for their correctness and / or accuracy with regard to coloring, alignment, printed image arrangement and the like according to the preamble of claim 1 and to a device for carrying out the method.
  • a device for carrying out such a method is already known from EP 0 256970 B1.
  • This known device for color measurement on a sample with a transmitter focusing a plurality of semiconductor radiation sources of different spectral ranges controls the radiation sources sequentially, the radiation reflected by the sample being fed to a computer for evaluation by means of a single receiver and the Radiation sources are focused on the sample in such a way that the sequential control of three semiconductor radiation sources for the colors blue, green and red is aimed at one and the same point of the sample.
  • the known device is used in the
  • a preferred application example for such a test method is the fully automated production of folding boxes as packaging for a wide variety of products, such as the pharmaceutical industry, the food industry and the like.
  • the sequence of the individual processing stages is broadly characterized in that initially large-format cardboard sheets are provided with colored imprints, the arrangement and outline of which are matched to later folding boxes, of which a single cardboard sheet can contain a large number.
  • the print images are in
  • the areal cheapest arrangement for minimizing waste is distributed in such a way that a maximum of individual cuts can be produced from standardized sheet formats. It is possible that the later individual cutouts, in technical terms here referred to as "benefits", are printed on the sheets in very different orientations, for example rotated in rows and rows by 90 ° or 180 °.
  • a wide variety of imprints, for example for folding boxes of different sizes or different products, can also appear on one and the same sheet and the sheets alternately have different total prints.
  • the stacks are delivered in large pallets matted cardboard sheets with the color imprints, individually removed from a so-called insertion, for example by means of suction cups, and separated in cycles, fed to snow-punching punching machines, which then punch out the individual benefits precisely from the sheet.
  • the cardboard sheets individually removed from the sheet stack via the suction cups are in this case transported from the insert via transport belts to the feed table and both against a front stop which is referred to as the front mark, as well as precisely aligned against a lateral stop, the so-called side mark.
  • the cardboard sheet stands still for a short time (approx. 10 ms) before it is introduced into the punching station, that is, at the moment in which the front and side edges are positioned extremely precisely.
  • a starting chain and gripper system takes over the sheet or blank and pulls it into the punching station, which in the given high-performance production takes place in rapid succession for all subsequent sheets in the same way.
  • the chains moving the blank there are slowed down again with exact timing and stride length.
  • the subsequent stamping stroke of the stamping unit separates the folding box blanks in the given cycle sequence, which here is less than 3 / ⁇ .
  • the color printing sheets Before the color printing sheets are introduced into the punching station, they must be checked for a plurality of individual criteria in order subsequently to be able to avoid rejects as far as possible. This includes recognizing that the correct sheet in accordance with the die and patrix of the punch has been aligned on the feed table in front of the punching station, especially since the intermixing of different color printing templates, that is to say of cardboard sheets with different printing contents, is by no means excluded when delivering pallets can be. As is known per se, this type of security is checked by means of binary code printed on the sheets. A further control criterion is that of the sheet being inserted in the correct direction, that is to say its alignment on the attachment corresponding to the subsequent punching process. location table. It must also be checked that the print image (s) are properly aligned with the sheet.
  • print registers which later are preferably register triangles located in the area of the waste edges, the scanning widths and color contents of which have to be checked via an actual / setpoint comparison.
  • an essential control criterion is the check for color fastness of the color printing template for each of the printing inks used.
  • An improved control option is the use of so-called print mark scanning, by printing additional individual characters on the color printing templates by means of optical fiber sensors, the existing coded printing can be recognized very quickly, so that in the event of malfunctions, the automatic machine sequence is stopped and the faulty cardboard sheet before it enters the punching crucible is drawn in, can be removed.
  • the control options realized by means of optical fiber sensors do not provide an adequate optical resolution for the constantly growing requirements and, in particular, cannot be used for checking the necessary color measurements.
  • the above-mentioned device for color measurement according to EP 0 256 970 B1 already largely remedies this, since it contains a color measuring head, whose punctiform scanning is possible with a high resolution and which also works with a high measuring sequence.
  • This device for color measurement is equipped with three semiconductor radiation sources of different spectral ranges, namely for the colors blue, green and red, which are triggered in series by pulses. The radiation focused on a point reflects the remitted portion from this point back to a single receiver, which is followed by a computer and evaluation electronics. With this device the measuring process is only possible with moving color printing originals, the movement being measured by means of an incremental encoder in given path units.
  • CCDs as electronic image converters, ie components that are almost unrivaled today, is possible here in a particularly advantageous manner even with a high storage capacity, the CCD receiver being able to be cost-effective since it only receives monochromatic light. Since the individual receiving elements (pixels) are arranged with high accuracy in a fixed spacing grid, this grid can be used for geometric measurements, ie the measurements can be carried out with good resolution based on the geometric assignment between the illuminated line / surface and the receiver.
  • CCD sensors have often been used in conjunction with flash lamps, or halogen light has been used without pulsing, with color components having to be separated by filters in front of the receivers.
  • code are removed from a template using a scanner and processed in a computer-controlled manner, for example when cashing out goods in wholesale stores, the one to be scanned can and will be The original is illuminated only in a non-pulsed manner with monochromatic constant light sources so that, for example, when red light sources are used, color detections which lie in this wavelength range cannot be carried out.
  • the present method can be combined into a functional unit, which considerably simplifies assembly, disassembly and maintenance.
  • FIG. 1 shows a schematic illustration of only a row of semiconductor radiation elements which are arranged cyclically in a repetitive manner and sequentially emit light of the wavelengths blue, green and red with the associated collecting optics, and
  • FIG. 2 shows an illustration according to FIG. 1 with reduction optics for the light remitted by the sample onto a CCD cell receiver.
  • the dimensional arrangement shown in the exemplary embodiment according to FIGS. 1 and 2 for carrying out the method according to the invention consists of a row 1 of five times three semiconductor radiation sources, each triple periodicity each having a blue, green and red light-emitting semiconductor diode la, lb, lc. This periodicity is repeated a total of five times in the row shown, ie the blue semiconductor diode la, the green semiconductor diode lb and the red semiconductor diode lc are followed again in this order by la blue, lb green, lc red in a cyclical order.
  • the semiconductor diodes la, lb, lc as radiation sources are connected to a control unit which carries out a serial control.
  • the serially controlled semiconductor radiation sources that is to say briefly emitting light pulses in succession, in each case together, but in succession the blue, green and red, are identified by a suitable mirror and lens arrangement 2 as a blue, green and red line 3, that is to say as a projected projection, the semiconductor arrangement is projected directly onto the test specimen, that is to say onto the bar and / or area coding printed on the test specimen, as a print mark (s).
  • the light line 3 (or light matrix) generated is carried out using a series of red, green, blue light-emitting diode blocks, which is collected by a cylindrical lens 2.
  • the linear blue, green and red semiconductor arrangement projects red, green and blue lines with a length of 100 mm in the exemplary embodiment, ie on a 1: 1 scale of the diode arrangement.
  • the light reflected or remitted by the projection surface is then, as shown in FIG. 2, via a converging optics 4 again sharp image in the form of line 5 in a dimension reduced ten times.
  • a 10 mm long CCD receiver is arranged in the imaging plane of line 5.
  • the CCD receiver is composed of 1,000 pixels, that is to say receiver elements with a center spacing of 10 ⁇ m, that is to say that for each 0.1 mm of the illuminated line on the test specimen, one pixel is used as a measuring sensor and thus also one geometric assignment is possible with accurate measurements.
  • the simplified representation according to FIGS. 1 and 2 thus represents a line camera with one-dimensional scanning in its mode of operation and application, whereby it is easily possible and within the scope of the present inventive concept to arrange this one-dimensional arrangement as a matrix into one expand two-dimensional geometrical arrangement, with the color sequence then blue, green, red; blue, green, red etc. are repeated in a row for the second dimension in the respective column, i.e. in the first column again starting with blue, green, red, in the second with green, red, blue in the third with red, green, blue and so on, cyclically permeated with the given periodicity.
  • this grid can be used completely for geometric measurements, for which only the length of the light line 3, the imaging scale of the receiver optics 2 and thus ultimately the Dimensioning of the CCD receiver and the number of receiver elements must be known.
  • the light-emitting diode combinations 1, which are driven in series in rapid succession, thus generate, on the CCD receiver elements, geometrically, at the same location, reception signals which correspond to the remitted light components of the red, blue and green projection lines 3.
  • the CCD receiver elements are followed by a computer-controlled evaluation device which evaluates the intensity pattern supplied by the receiver elements in the three different spectral ranges with regard to the geometry in relation to the print marks on the test specimen irradiated by the semiconductor radiation sources and with regard to the color to be derived from the intensity pattern .
  • the method according to the invention and the mode of operation of the device described above are to be explained with reference to a folding box punching machine which, as described above, punches out the folding box blanks from cardboard sheets aligned for the punching process. Codings and print marks are applied to the cardboard sheets as templates, which must be recognized as correct, otherwise the punching process is interrupted.
  • the CCD receiver is calibrated against a white standard, ie the reflectance of the white standard is measured when irradiated with the different wavelengths, and the activation times of the radiation sources and thus the exposure time of the receiver elements controlled depending on the spectral ranges so that the same reflectance, for example 100%, is generated in each spectral range.
  • the individual markings to be recognized are irradiated and the respective intensity pattern generated by the CCD receiver depending on the location as. Comparison patterns are stored or the intensity patterns are analyzed with regard to color and geometry and comparison values are saved.
  • the control unit switches on the red, green and blue radiation sources in quick succession and thus exposes the CCD line, on the surface of which the pattern of the detected original is shown.
  • the amount of light supplied to the pixels is integrated and serially read out and evaluated pixel by pixel for evaluation.
  • the evaluation device is thus aware of which measurement point on the template with which intensity was emitted during the respective red, green or blue exposure and can make a comparison with the specified intensity pattern and make a statement about the correctness of the color or the location of the Hit print template.
  • the semiconductor radiation sources in each case of a spectral range can be arranged in a row for themselves, so that, for example, a row with red, a row with green and a row with blue semiconductor radiation sources are provided, the radiation of the different rows, however, should form projection lines 3 which lie one above the other.
  • the radiation of different spectral ranges can preferably be combined via dirchroic mirrors, which makes the measurement even more precise, ie any position-dependent position errors are not included in the measurement, since they are the same for all spectral ranges.
  • the arrangement of the semiconductor radiation sources can be carried out in such a way that radiation sources with two alternating spectral ranges, for example red and green in a first
  • Row, and radiation sources with yet another spectral range, for example blue in a second row, are arranged, with both rows emitting a line from the side.
  • the radiations can be brought together via dichroic mirrors.
  • Hybrids can also be used in which semiconductor elements of different spectral ranges are arranged in one housing. It is essential that the remitted light line or light surface is mapped on the CCD receiver in a geometric assignment is so that a correct evaluation can be made.
  • radiation sources with three different spectral ranges have been selected; Of course, several or other spectral ranges can also be provided.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L'invention concerne un procédé permettant de vérifier la justesse et/ou l'exactitude des coloris, de l'alignement, de la structure de l'impression et similaires de dessins-modèles imprimés en couleur, dans le cadre de la production en ligne, à vitesse élevée, de produits d'emballage, d'étiquetage et d'autres produits similaires fabriqués en série. Plusieurs opérations doivent être accomplies en plusieurs étapes de production sur différentes unités de machine, dont le déroulement est régulé au moyen de codes prédéfinis. A cet effet, on utilise plusieurs sources de rayonnements à semi-conducteurs (1) à commande séquentielle de différentes zones spectrales. La part réfléchie du rayonnement focalisé sur les codes de l'échantillon régule des processus de traitement subséquents par l'intermédiaire d'une unité électronique d'évaluation commandée par ordinateur. Les sources de rayonnements à semi-conducteurs sont disposées de manière linéaire et/ou planiforme et sont actionnées de manière séquentielle par impulsions, en fonction de leur zone spectrale. La part de rayonnement renvoyée par l'échantillon est projetée à l'endroit voulu sur un récepteur CCD par l'intermédiaire d'un système optique récepteur, et les diagrammes d'intensité fournis par le récepteur CCD sont évalués dans un dispositif d'évaluation.
EP96908006A 1995-03-30 1996-03-26 Procede de verification de dessins-modeles imprimes en couleur et dispositif de mise en uvre dudit procede Withdrawn EP0817955A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19511782 1995-03-30
DE19511782A DE19511782C2 (de) 1995-03-30 1995-03-30 Verfahren zur Prüfung von Farbdruckvorlagen und Vorrichtung zur Durchführung des Verfahrens
PCT/DE1996/000593 WO1996030733A1 (fr) 1995-03-30 1996-03-26 Procede de verification de dessins-modeles imprimes en couleur et dispositif de mise en ×uvre dudit procede

Publications (1)

Publication Number Publication Date
EP0817955A1 true EP0817955A1 (fr) 1998-01-14

Family

ID=7758226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96908006A Withdrawn EP0817955A1 (fr) 1995-03-30 1996-03-26 Procede de verification de dessins-modeles imprimes en couleur et dispositif de mise en uvre dudit procede

Country Status (4)

Country Link
EP (1) EP0817955A1 (fr)
JP (1) JPH11502924A (fr)
DE (1) DE19511782C2 (fr)
WO (1) WO1996030733A1 (fr)

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US5963333A (en) * 1996-09-12 1999-10-05 Color Savvy Systems Limited Color sensor
IT1292543B1 (it) * 1997-04-09 1999-02-08 Viptronic Srl Sistema di rilevamenti densitometrici e spettrometrici.
DE19853120C1 (de) * 1998-11-18 2001-09-27 Igt Emus Elektronische Mess Un Verfahren und Meßeinrichtung zum Messen der Transparenz, Opazität und Wolkigkeit
EP1302742B1 (fr) * 2001-10-16 2016-03-30 Datalogic IP Tech S.r.l. Système de balayage optoéléctronique pour déterminer la forme et/ou le volume d'objets
DE102004003613B4 (de) 2004-01-25 2015-01-08 grapho metronic Meß- und Regeltechnik GmbH Vorrichtung und Erfassung eines Bildes von einem vorbestimmten Ausschnitt eines in Bewegung befindlichen Druckerzeugnisses
DE102004014532B3 (de) 2004-03-23 2005-03-03 Koenig & Bauer Ag Optisches System zur Erzeugung eines beleuchteten Gebildes
DE102004014541B3 (de) 2004-03-23 2005-05-04 Koenig & Bauer Ag Optisches System zur Erzeugung eines Beleuchtungsstreifens
DE102004035786B4 (de) * 2004-03-23 2010-04-01 Koenig & Bauer Aktiengesellschaft Inline-Inspektionssysteme
DE102005007780A1 (de) 2005-02-19 2006-08-31 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zur Messung der zonalen Farbgebung
DE102005031957B4 (de) 2005-07-08 2007-03-22 Koenig & Bauer Ag Vorrichtung zur Inspektion eines Bedruckstoffes mit uneinheitlich reflektierenden Oberflächen
DE102005053433B4 (de) * 2005-11-09 2009-05-14 Leuze Electronic Gmbh & Co Kg Verfahren zum Erfassen von Passermarken
DE102006012330C5 (de) 2006-03-17 2023-04-06 manroland sheetfed GmbH Bogendruckmaschine mit Nachverarbeitungseinheit
DE102006056758A1 (de) * 2006-12-01 2008-06-05 Lithec Gmbh Verfahren und Einrichtung zum Messen von Farb- und Helligkeitsanteilen
DE102007031088A1 (de) * 2007-07-04 2009-01-08 Manroland Ag Verfahren zur messtechnischen Erfassung eines bedruckten Bedruckstoffs
JP5358527B2 (ja) * 2010-07-20 2013-12-04 株式会社日立ハイテクノロジーズ 分光光度計、および吸光度測定方法
JP6500070B1 (ja) * 2017-10-16 2019-04-10 ジャパンシステム株式会社 検査装置、検査用照明装置

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Also Published As

Publication number Publication date
DE19511782A1 (de) 1996-10-02
WO1996030733A1 (fr) 1996-10-03
JPH11502924A (ja) 1999-03-09
DE19511782C2 (de) 1997-07-31

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