EP0759192B1 - Bande de commande de processus et procede d'enregistrement - Google Patents

Bande de commande de processus et procede d'enregistrement Download PDF

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Publication number
EP0759192B1
EP0759192B1 EP96903928A EP96903928A EP0759192B1 EP 0759192 B1 EP0759192 B1 EP 0759192B1 EP 96903928 A EP96903928 A EP 96903928A EP 96903928 A EP96903928 A EP 96903928A EP 0759192 B1 EP0759192 B1 EP 0759192B1
Authority
EP
European Patent Office
Prior art keywords
strip
process control
value
control strip
exposure
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.)
Expired - Lifetime
Application number
EP96903928A
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German (de)
English (en)
Other versions
EP0759192A1 (fr
Inventor
Thomas Köhler
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0759192A1 publication Critical patent/EP0759192A1/fr
Application granted granted Critical
Publication of EP0759192B1 publication Critical patent/EP0759192B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/007—Processing control, e.g. test strip, timing devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree

Definitions

  • the invention relates to the field of electronic reproduction technology and relates to a process control strip for visual control and calibration an exposure process for a recording material, in particular for a Printing plate, and a method for recording the process control strip.
  • the dot and line, screened exposure of a recording material is usually done by means of an electronic one Recording device, also called imagesetter or recorder.
  • image signal values which represent the tonal values to be recorded
  • a raster generator supplied in which the image signal values after a raster function in Control signal values for one generated in an exposure unit of the imagesetter Exposure beam to be converted.
  • the exposure beam switch on and off and thus determine which pixels as parts of the halftone dots exposed on the film or not exposed.
  • the grid function sets the size of the grid points depending on the ones to be recorded Tonal values.
  • the real tonal values produced on the film give way or screen dot sizes from the desired nominal tonal values, since every pixel and therefore every raster point by overexposing more or less is recorded enlarged.
  • the deviations between the real generated Tonal values and the nominal tonal values are referred to as point increases, which lead to disturbing tonal value changes in the reproduction.
  • the dot gains are therefore compensated for in the imagesetter during film exposure, by the image signal values representing the nominal tonal values after a correction curve determined before the film exposure by a so-called Film linearization can be corrected so that the real on the film recorded tonal values correspond to the nominal tonal values.
  • the film exposed in the imagesetter is placed in a developing station developed and used for the production of a printing form.
  • the conventional production of printing plates takes place in two sub-processes.
  • a film is exposed using an imagesetter and the exposed Film developed in a development station.
  • the exposed and developed film as a template in a copier copied a photosensitive printing plate, whereby also slight positive or negative dot gains and thus tone value distortions can occur.
  • the exposed printing plate is then also in one Development station developed.
  • the conventional calibration of the first sub-process namely the point and line-wise film exposure in an imagesetter and film development in one Development station, for example with the help of stepped standard gray wedges, which are exposed on the film and co-developed, and by measuring the Solid densities. Constant monitoring of the stability of exposure and development is too expensive in practice with the known means. Compliance For this reason, a stable work process has so far been carried out indirectly Control and regulation or adjustment of suitable process parameters such as the intensity of the exposure beam and / or the correction curve in the imagesetter and the development temperature and / or the regeneration rates in the development station.
  • the conventional calibration of the second sub-process namely the pictorial one Exposure of the printing plate in a copier and the development of the exposed Printing plate in a development station, is often made using the microline method with the help of precision measuring strips, for example with the FOGRA precision measuring strips PMS-I or the UGRA offset test wedge 1982.
  • These Precision measuring strips are e.g. B. in detail in "fogra praxis report” No. 34, 1990, Fogra-PMS-I and UGRA offset test wedge 1982.
  • FOGRA German Research Association for Printing and Reproduction Technology e.V.
  • test film which together in a copying device copied with the original onto a printing plate in order to be on the printing plate a control image for visual control of the subsequent development process to create.
  • the test film shows fine signal elements in the form of finely structured Districts and rough signal elements in the form of a roughly structured background district that surrounds and separates the finely structured districts.
  • the Districts each consist of a large number of points.
  • the finely structured Districts are such that a change in process conditions to one visible change in their optical density results while the optical Density of the roughly structured background area when the process conditions change changes only slightly, causing changes in process conditions be displayed visually.
  • Constant monitoring of the stability of the copying process and the development of the Printing plate is also too expensive in practice with the known means.
  • adherence to a stable work process takes place at the So far, copying has also been done indirectly through control and regulation or adjustment suitable process parameters such as the exposure time or the number of cycles and the duration of vacuum suction of the pressure plate at the imagewise exposures in the copier and the development temperature or the regeneration rates in the development station.
  • suitable process parameters such as the exposure time or the number of cycles and the duration of vacuum suction of the pressure plate at the imagewise exposures in the copier and the development temperature or the regeneration rates in the development station.
  • the object of the invention is therefore to provide a process control strip for visual Control and calibration of an exposure process for a recording material, in particular for a printing plate, and a method for recording to improve the process control strip in such a way that it can also be used for direct exposure of printing plates in electronic recording devices are applicable and high quality quality monitoring with regard to exposure and development enable.
  • Fig. 1 shows the basic structure of a process control strip (1) for direct exposure of printing plates by means of an imagesetter (computer-to-plate).
  • the process control strip (1) is during the direct exposure of the printing plate in the imagesetter outside of that intended for the information to be exposed Area of the printing plate exposed on the printing plate and together with the information developed in a development station.
  • the exposed and developed process control strip (1) is used for visual control and setting of the process parameters such as the intensity of the exposure beam and the development temperature and / or the regeneration rates in the development station.
  • the process control strip (1) basically consists of three in the direction of the larger one Extension of the process control strip (1) extending parallel to each other arranged strips, namely a setpoint strip (2), an actual value strip (3) and a display strip (4).
  • the setpoint strip (2) is a stepped tonal value wedge for example 16 reference levels from 0% to 100%.
  • the reference tone values of the tone value wedge are largely process-independent, i.e. they change only insignificant in the case of fluctuations in process parameters.
  • a setpoint range can be set within the tone value wedge of the setpoint strip (1) (5) the at least one reference tone level as the setpoint tolerance range contains that in the exposure and development process on the Pressure plate should be reached.
  • the reference tone levels of the Tone value wedge appropriately selected such that the desired setpoint range (5) lies in the middle area of the process control strip (1).
  • a tone value wedge can also be used with continuously changing reference tone values.
  • the tone value wedge of the setpoint strip (2) is a line grid with perpendicular to Extension of the process control strip (1) oriented lines (6) formed are composed of individual pixels during exposure.
  • the reference tone values of the tonal value wedge are due to the ratio of line width to line interval of the line grid defined.
  • the lines (6) of the tone value wedge represent rough signal elements The size of the coarse signal elements changes with fluctuations the process parameters are only minor because of the process-dependent changes the pixel sizes essentially only in the direction of the lines on the side Edges of the lines (6) lead to negligible tonal value changes, whereby the reference tone values of the setpoint strip (2) are essentially process-independent are.
  • the structure of the line grid of the setpoint strip (2) is due to the resolving power of the human eye and should be chosen that the integrating effect regarding a homogeneous impression is not lost goes.
  • a favorable value for the line spacing in the line grid lies in the range 10 to 16 times the value of the pixel diameter by the addressing can be set when generating the halftone dot.
  • the actual value strip (3) running parallel to the setpoint strip (2) is finely screened, for example with 333 lines / cm, and represents a highly process-dependent, but represents a uniform tonal value within the actual value strip (3).
  • the actual value strip (3) consists of a plurality of fine arranged in a grid Halftone dots, each halftone dot within a grid of the grid is composed of individual exposed pixels during the exposure.
  • the sum of the exposed pixel areas or the halftone dot size within one Grid mesh based on the total area of the grid mesh determines the exposed tonal value.
  • the exposed pixels or those composed of the exposed pixels Grid points within the actual value strip (3) form fine signal elements, whose size changes with fluctuations in the process parameters, which creates process-dependent tonal value changes.
  • each halftone dot is more appropriate Way from a comparatively large number of within a grid of the available pixels of the grid are exposed, for example from 2 x 2 exposed pixels within a 3 x 3 pixel grid.
  • a process-dependent change in pixel size thus brings about a comparable one large change in the percentage of the total area of a Grid mesh, so that changes in pixel size due to fluctuations the process parameter changes the tonal value within the actual value strip (3) arise.
  • the structure of the grid in the actual value strip (3) with regard to the size of the grid mesh, the dot size and dot shape is determined by the resolution limited to the printing plate to be exposed and is therefore of the plate type and additional also dependent on addressing when generating raster points. practical Values are 3 to 5 times the addressing for the side length of one square grid grid.
  • Each pixel size exposed on the actual value strip (3) of the process control strip (1) or dot size thus represents one achieved in the exposure process Tone value that corresponds to a reference tone value of the tone value wedge of the setpoint strip (2) matches.
  • the tonal value of the actual value strip changes (3) while the tonal values of the tonal value wedge in the setpoint strip (2) of the process control strip (1) remain practically stable.
  • the tonal values are matched at another point on the process control strip (1).
  • the process control strip (1) is parallel to the setpoint strip (2) and the Actual value strips (3) extending display strips (4) in the longitudinal direction of the strip Display fields arranged one behind the other and labeled with symbols (7) is divided.
  • a display field (7a) e.g. B. with the label "setpoint reached” or “correct exposure” while the neighboring display fields (7b, 7c) e.g. B. with the inscription “falling below setpoint” or “too little exposure” or “setpoint exceeded” or “too much exposure” are provided.
  • Fig. 3 shows a process control strip (1) simulated as a contone pressure Reproduction of the real optical impression for printing reasons not is possible, the real optical impression in Fig. 3 is by means of a contone print the process control strip (1) simulated.
  • the visual tonal value comparison thus advantageously provides a continuous one Statement about process stability.
  • the distance between the "coarseness" of the line grid the tone value wedge in the setpoint strip (2) and the "fineness" of Dot grid in the actual value strip (3) determines the sensitivity of the control process.
  • the calibration and control procedure with the help of the process control strip (1) enables a highly sensitive quality assessment of the overall process of direct exposure and development of printing plates.
  • the high sensitivity poses in particular the increased quality requirements that are certain when exposing Printing plates with frequency-modulated grids exist.
  • Fig. 4 shows a basic block diagram of a device for direct exposure of printing plates, in particular offset printing plates.
  • the facility exists essentially a raster image processor (8), simply called RIP, a plate imager (9) and a plate development station (10).
  • One sheet to be exposed on the printing plate and the one next to the sheet Process control strips (1) to be exposed are, for example, in an electronic Assembly station assembled according to an imposition program.
  • the one there PostScript image data obtained are then processed in a raster image processor (8) interpreters included in a display list.
  • the raster generator also contained in the raster image processor (8) Display list after a raster function in corresponding control signal values in Form of a bitmap for switching on and off pixel by pixel in an exposure unit of the platesetter (9) converted exposure beam.
  • the platesetter (9) takes the pixel-by-line exposure of the printing plate (11) before.
  • the control signal values of the bitmap determine during plate exposure, which pixels are exposed as parts of the halftone dots on the printing plate (11) or not exposed.
  • the grid function defines the size of the grid points depending on the tonal values to be recorded.
  • the exposure beam is, for example, a laser beam, which by means of the control signal values controlled modulator is switched on and off.
  • a platesetter (9) can, for example, the "Gutenberg" platesetter from Linotype-Hell AG can be used.
  • the exposed plate is on the printing plate (11) exposed in the platesetter (9) Printing sheet (12) and the process control strip exposed outside the printing sheet (12) (1) visible.
  • a CTX printing plate for example, can be used as the printing plate (11) from Polychrome can be used.
  • the exposed printing plate (11) is developed in the plate development station (10).
  • the process control strip (1) on the exposed and developed printing plate (10 ') is then used for visual control of the exposure process and for adjustment the process parameter used.

Claims (15)

  1. Bande de contrôle de procédé pour contrôler visuellement un procédé d'exposition d'un support d'enregistrement comportant des éléments de signaux grossiers dont la taille est essentiellement constante pour les variations du procédé et des éléments de signaux fins dont la taille change lors des variations du procédé,
    caractérisée en ce que
    une première bande (2) qui s'étend dans la direction de la plus grande extension de la bande de contrôle de procédé (1), comporte un coin de valeurs de teinte avec des valeurs de teinte de référence variant dans la direction de la bande, indépendamment du procédé, pour constituer des éléments de signaux grossiers ;
    une seconde bande (3) parallèle à la première bande (2) ayant une trame avec des points de trame fins comme éléments de signaux fins qui représentent dans la seconde bande (3), une valeur de teinte régulière, dépendant fortement du procédé ; et
    la matière d'enregistrement est une plaque d'impression.
  2. Bande de contrôle de procédé selon la revendication 1,
    caractérisée en ce que
    le coin des valeurs de teinte de la première bande (2) est en forme de trame linéaire.
  3. Bande de contrôle de procédé selon la revendication 2,
    caractérisée en ce que
    les lignes (6) de la trame linéaire de la première bande (2) sont orientées perpendiculairement à la direction de la bande.
  4. Bande de contrôle de procédé selon l'une des revendications 2 ou 3,
    caractérisée en ce que
    les lignes (6) de la trame linéaire de la première bande (2) et les points de trame de la seconde bande (3) sont composées de pixels enregistrés.
  5. Bande de contrôle de procédé selon l'une des revendications 1 à 4,
    caractérisée en ce que
    chacun des points de trame à l'intérieur d'une maille de la trame de la seconde bande (3) est exposé par un grand nombre de pixels, disponibles à l'intérieur de la maille de la trame.
  6. Bande de contrôle de procédé selon la revendication 5,
    caractérisée en ce que
    chaque maille de la trame se compose de 3 x 3 pixels et chaque point de trame dans une maille de trame est exposé par 2 x 2 pixels.
  7. Bande de contrôle de procédé selon l'une des revendications 1 à 6,
    caractérisée en ce que
    dans le coin des valeurs de teinte de la première bande (2) on définit une zone de valeurs de consigne (5) qui comprend au moins une valeur de teinte de référence souhaitée dans le procédé d'exposition pour la comparaison visuelle avec la valeur de teinte obtenue dans le procédé d'exposition pour la seconde bande (3).
  8. Bande de contrôle de procédé selon l'une des revendications 1 à 7,
    caractérisée en ce que
    les valeurs de teinte de référence du coin de valeur de teinte dans la première bande (2) sont choisies pour que la plage de valeurs de consigne définies (5) se situe dans la plage médiane de la bande de contrôle de procédé (1).
  9. Bande de contrôle de procédé selon l'une des revendications 1 à 8,
    caractérisée en ce que
    la bande de contrôle de procédé (1) comporte une troisième bande (4) parallèle à la première et à la seconde bande (2, 3) pour afficher le degré de concordance des valeurs de teinte entre les valeurs de teinte de référence de la première bande (2) et les valeurs de teinte de la seconde bande (3) obtenues par le procédé d'exposition.
  10. Bande de contrôle de procédé selon la revendication 9,
    caractérisée en ce que
    la troisième bande (4) est subdivisée en champs d'affichage (7) placés l'un derrière l'autre dans la direction de la bande, ces champs indiquant le degré respectif de concordance des valeurs de teinte par des symboles.
  11. Bande de contrôle de procédé selon les revendications 9 et 10,
    caractérisée en ce que
    à la plage de valeurs de consigne (5) définie de la première bande (2), est associé un champ d'affichage (7a) dans la troisième bande (4) avec le symbole « valeur de teinte réalisée » ; et
    les champs d'affichage (7b, 7c) voisins de la troisième bande (4) reçoivent des symboles « dépassement vers le haut de la valeur de consigne » ou « dépassement vers le bas de la valeur de consigne ».
  12. Procédé d'exposition d'une bande de contrôle de procédé,
    caractérisé en ce que
    la bande de contrôle de procédé est une bande de contrôle selon l'une des revendications 1 à 11 et cette bande (1) est exposée directement sur une plaque d'impression (11) pixel par pixel et ligne par ligne.
  13. Procédé selon la revendication 12,
    caractérisé en ce que
    l'exposition de la bande contrôle de procédé (1) se fait en même temps qu'on réalise l'exposition point par point et ligne par ligne de la plaque d'impression (11).
  14. Procédé selon l'une des revendications 12 ou 13,
    caractérisé en ce que
    la bande de contrôle de procédé (1) génère des données postscript.
  15. Procédé selon l'une des revendications 12 à 14,
    caractérisé en ce que
    la bande de contrôle de procédé (1) est orientée lors de l'exposition point par point et ligne par ligne de la plaque d'impression (11) pour que les lignes (6) de la trame linéaire de la première bande (2) soient dans la direction des lignes.
EP96903928A 1995-03-04 1996-03-02 Bande de commande de processus et procede d'enregistrement Expired - Lifetime EP0759192B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19507665 1995-03-04
DE19507665A DE19507665A1 (de) 1995-03-04 1995-03-04 Verfahren zur Kalibrierung und Kontrolle einer Belichtung und Belichtungs-Kontrollstreifen
PCT/DE1996/000363 WO1996027821A1 (fr) 1995-03-04 1996-03-02 Bande de commande de processus et procede d'enregistrement

Publications (2)

Publication Number Publication Date
EP0759192A1 EP0759192A1 (fr) 1997-02-26
EP0759192B1 true EP0759192B1 (fr) 2003-01-02

Family

ID=7755685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96903928A Expired - Lifetime EP0759192B1 (fr) 1995-03-04 1996-03-02 Bande de commande de processus et procede d'enregistrement

Country Status (5)

Country Link
US (1) US5748331A (fr)
EP (1) EP0759192B1 (fr)
JP (1) JP2888992B2 (fr)
DE (2) DE19507665A1 (fr)
WO (1) WO1996027821A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP1832924A1 (fr) * 2006-03-10 2007-09-12 Heidelberger Druckmaschinen AG Bande de contrôle de processus et procédé d'enregistrement

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JPH10104761A (ja) * 1996-10-02 1998-04-24 Noritsu Koki Co Ltd 面光源の自動補正方法および自動補正装置
EP0847858B1 (fr) * 1996-12-11 2002-07-24 Agfa-Gevaert Bande de contrôle visible pour milieux de formation d'images
DE19825828A1 (de) * 1998-06-10 1999-12-16 Agfa Gevaert Ag Kontrollelement für ein strahlungsempfindliches Aufzeichnungsmaterial und Verfahren zum Bestimmen der Belichtungsenergie für ein strahlungsempfindliches Aufzeichnungsmaterial mittels eines Kontrollelements
GB0012457D0 (en) * 2000-05-22 2000-07-12 Priest Mark Calibrating printing machines
WO2003033266A1 (fr) * 2001-10-15 2003-04-24 Toppan Printing Co., Ltd. Procede d'impression, matiere imprimee et controleur d'impression
GB2392994A (en) * 2002-05-30 2004-03-17 Medivance Instr Ltd Apparatus and method for monitoring the efficacy of an X-ray or photographic development process
FR2865293B1 (fr) * 2004-01-20 2006-03-31 Atmel Nantes Sa Microcontroleur a convertisseur numerique analogique synchronise.
DE102004013290A1 (de) 2004-03-18 2005-09-29 Heidelberger Druckmaschinen Ag Visuelle Kontrolleinrichtung für belichtete Druckplatten
WO2008053719A1 (fr) * 2006-10-31 2008-05-08 Konica Minolta Medical & Graphic, Inc. Procédé de fabrication de plaque, dispositif de sortie d'image sur plaque d'impression, dispositif d'édition d'image et système de sortie d'image sur plaque d'impression
US8570340B2 (en) 2008-03-31 2013-10-29 Konica Minolta Laboratory U.S.A., Inc. Systems and methods for data compression
US8699042B2 (en) * 2008-06-12 2014-04-15 Konica Minolta Laboratory U.S.A., Inc. Systems and methods for multi-mode color blending
DE102013010970A1 (de) 2013-07-01 2015-01-08 Heidelberger Druckmaschinen Ag Speziell gerastertes Graumessfeld
CN108594425B (zh) * 2016-07-24 2020-03-06 哈尔滨理工大学 对比度连续调节方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1832924A1 (fr) * 2006-03-10 2007-09-12 Heidelberger Druckmaschinen AG Bande de contrôle de processus et procédé d'enregistrement
DE102006011140A1 (de) * 2006-03-10 2007-09-13 Heidelberger Druckmaschinen Ag Prozesskontrollstreifen und Verfahren zur Aufzeichnung

Also Published As

Publication number Publication date
JPH09505678A (ja) 1997-06-03
DE59610020D1 (de) 2003-02-06
DE19507665A1 (de) 1996-09-05
JP2888992B2 (ja) 1999-05-10
US5748331A (en) 1998-05-05
WO1996027821A1 (fr) 1996-09-12
EP0759192A1 (fr) 1997-02-26

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