EP1410113A1 - Method and device for controlling a print process with high colour density - Google Patents
Method and device for controlling a print process with high colour densityInfo
- Publication number
- EP1410113A1 EP1410113A1 EP02758387A EP02758387A EP1410113A1 EP 1410113 A1 EP1410113 A1 EP 1410113A1 EP 02758387 A EP02758387 A EP 02758387A EP 02758387 A EP02758387 A EP 02758387A EP 1410113 A1 EP1410113 A1 EP 1410113A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toner
- latent
- mark
- color density
- toner mark
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00025—Machine control, e.g. regulating different parts of the machine
- G03G2215/00029—Image density detection
- G03G2215/00033—Image density detection on recording member
- G03G2215/00037—Toner image detection
- G03G2215/00042—Optical detection
Definitions
- the invention relates to a method for controlling the printing process in a printer or copier, in which a character generator generates a latent printed image and a latent toner mark on an intermediate carrier. Furthermore, the invention relates to a device for performing the method.
- toner material corresponding to the image structure is applied and fixed to a carrier material, for example paper, in order to produce the printed image.
- a carrier material for example paper
- Examples of such printing processes are the electrophotographic process and the magnetoelectric process.
- a latent printed image for example on a photoconductor, is first generated on an intermediate carrier, this latent printed image is colored and subsequently transferred to the carrier.
- the coloring of the printed image must be kept within narrow, predetermined limits.
- Such a printed image can have solid areas, halftone halftone areas,
- Contain lines, characters and other, relatively complex picture elements Contain lines, characters and other, relatively complex picture elements.
- the degree of inking for the printed image is indirectly determined using a toner mark and the printing process is controlled or regulated depending on the print result for this toner mark. Therefore, in addition to the latent print image essential for the customer, a latent toner mark is also generated on the intermediate carrier. Such a toner mark is relatively small compared to the area of the printed image.
- DE-A-39 38 354 describes a method for controlling the printing process in an image forming device.
- a latent toner mark When a latent toner mark is generated, the energy is reduced compared to the energy for producing a latent printed image.
- a reflex sensor determines the color density of the colored toner mark. Depending on the signal of this reflex sensor, either the lamp voltage of the character generator, the bias for a development process or the grid voltage of the main charger is set. The influence on the toner concentration in the development station is not described.
- the energy per unit area for the production of the latent toner mark is reduced compared to the energy per unit area for the production of the latent printed image with an otherwise identical image structure.
- this energy is in the form of radiation energy.
- this radiation energy for producing the latent toner mark which is designed, for example, as a full-tone area, is reduced compared to the radiation energy of an equally large full-tone area of the latent printed image. The result of this is that the color density of the solid tone area of the toner mark is less than the color density in the corresponding printed image.
- the signal from the reflection sensor that scans the toner mark is larger; in addition, the operating point of the reflection sensor lies on a characteristic curve of the color density over the toner concentration in a steeper range.
- a change in the color density on the toner mark accordingly brings about a correspondingly greater change in the signal of the reflection sensor, as a result of which the toner concentration can be tracked with a higher accuracy in order to achieve the desired color density on the printed printed image.
- a device having the features of claim ... is specified.
- the technical effects that can be achieved with this device have already been described in connection with the method.
- An embodiment of the invention is explained below with reference to the drawing. In it shows
- Fig. 1 shows schematically the structure of important functional elements in an electrophotographic
- Fig. 2 is a block diagram for controlling the
- Fig. 4 is a diagram showing the coloration on the paper as a print carrier depending on the toner concentration.
- Fig. 1 shows schematically the structure of important components of a device for controlling an electrophotographic
- a character generator 10 is designed in the form of an LED comb. It contains a large number of LEDs, the light of which is emitted onto the surface of a photoconductor drum 12 in order to generate latent image structures in the form of a charge image there.
- the character generator 10 emits light with the light output Ll.
- This area a is an area in which print images are generated for the customer.
- the LEDs of the character generator 10 send light to generate the structure of a
- Toner mark 14 out.
- this light has a lower light output L2 than the light output L1 in area a for an identical image structure, in the present case a full- tone image structure.
- the mark 14 colored with toner (the process step of developing with toner has been omitted in FIG. 1 for reasons of clarity) is scanned on the photoconductor 12 by a reflection sensor 16. Its electrical signal is used to control or regulate the printing process, as will be explained in more detail below.
- the printed image 18 colored with toner is transferred to a paper web 20.
- the toner mark 14 is not included in the printed image 18 for the customer.
- a basic setting and further steps are carried out to print the color density or the desired degree of coloring:
- Step a The print image requested by the customer is printed with a color density that can be set on the printer.
- Step b Using a densitometer, the color density in the customer's printed image is measured.
- This color density is a logarithmic measure of the ratio of the reflectance of the background to the reflectance of the image structure.
- Step c If the desired color density for the
- the toner concentration is changed manually or automatically until the actual color density matches the desired color density.
- Step d The light output L2 for the toner mark is reduced compared to the light output Ll in the case of high color densities, ie in the case of dark image structures in the printed image.
- Step e The basic setting of the printing process has been completed. When a plurality of pages are subsequently printed, the toner concentration is controlled or regulated so that the reduced one
- Fig. 2 shows in a block diagram the control of the coloring with high color density of the printed image for the customer.
- the blocks 22 and 24 describe the generation of the latent printed image 18 or the latent toner mark 14.
- the light energy L2 of the LEDs for producing the latent toner mark is reduced by a constant factor compared to the light energy L1 for producing the latent printed image 18. For example, this can be done by lowering the current that is supplied to the corresponding LEDs of the LED comb.
- the colored toner mark is scanned with the aid of the reflection sensor 16 and the measured one
- Color density imaged in a signal 26 This signal 26 represents an actual value of the printing process.
- This actual value 26 is compared with a target value 28.
- This setpoint was previously determined in the calibration method described above according to step c in a trial run.
- a setpoint-actual value comparator 30 determines the actual value deviation 32. Because of this deviation 32, the toner concentration is changed, for example increased or decreased. For example, to adjust the toner concentration
- the characteristic curve 36 results. It must be taken into account that the toner mark has a relatively small area in comparison to the printed image 18. Accordingly, the coloring is darker and the color density is increased.
- the characteristic curve 38 results for a relatively large area of the printed image.
- the characteristic curve 40 shows the relationship between the toner concentration and
- Control stroke for the control process By lowering the light output, a large control stroke can be achieved with the same toner concentration, as the characteristic curve 40 shows.
- Toner concentration is increased at characteristic 40 at this operating point. In this way, too Control accuracy for controlling the printing process improved.
- Light output L2 for the toner mark 14 can also take place in such a way that the ratio or the differential quotient of the toner concentration and color density at the operating point of the reflection sensor 16 exceeds a predetermined value.
- the characteristic curves 36, 38, 40 are not linear. A sufficient slope of the characteristic curve 36 is present in the range of small toner concentrations. This means that a lowering of the light output L2 for the toner mark 14 is no longer absolutely necessary and can be reversed. Therefore, in one embodiment of the invention, the reduction in light output is reversed from a color density value ⁇ a predetermined threshold value.
- the intermediate carrier on which the toner mark 14 is applied can also be a
- the invention can also be used for electromagnetic. Printing processes are applied. It is also possible to transfer the toner mark 14 onto a transfer belt and to scan this toner mark 14 on the transfer belt. It is also possible to
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Color Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
Beschreibungdescription
Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher ParbdichteMethod and device for controlling a printing process at high ink density
Die Erfindung betrifft ein Verfahren zum Steuern des Druckprozesses bei einem Drucker oder Kopierer, bei dem ein Zeichengenerator auf einem Zwischenträger ein latentes Druckbild und eine latente Tonermarke erzeugt. Weiterhin betrifft die Erfindung eine Einrichtung zum Durchführen des Verfahrens .The invention relates to a method for controlling the printing process in a printer or copier, in which a character generator generates a latent printed image and a latent toner mark on an intermediate carrier. Furthermore, the invention relates to a device for performing the method.
Bei elektrografisch arbeitenden Druckern oder Kopierern wird zur Erzeugung des gedruckten Bildes Tonermaterial entsprechend der Bildstruktur auf einen Trägerstoff, beispielsweise Papier, aufgebracht und fixiert. Beispiele für derartige Druckprozesse sind die elektrofotografischen Verfahren und das magnetoelektrische Verfahren. Hierbei wird zunächst auf einem Zwischenträger ein latentes Druckbild, zum Beispiel auf einem Fotoleiter, erzeugt, dieses latente Druckbild eingefärbt und nachfolgend auf den Träger übertragen. Zur Erzielung einer hohen Druckqualität muß die Einfärbung des Druckbildes innerhalb enger vorgegebener Grenzen gehalten werden. Ein derartiges Druckbild kann Vollflächen, gerasterte Halbtonflächen,In the case of electrographically operating printers or copiers, toner material corresponding to the image structure is applied and fixed to a carrier material, for example paper, in order to produce the printed image. Examples of such printing processes are the electrophotographic process and the magnetoelectric process. In this case, a latent printed image, for example on a photoconductor, is first generated on an intermediate carrier, this latent printed image is colored and subsequently transferred to the carrier. In order to achieve high print quality, the coloring of the printed image must be kept within narrow, predetermined limits. Such a printed image can have solid areas, halftone halftone areas,
Linien, Zeichen und andere, relativ komplexe Bildelemente enthalten. Zur genauen Steuerung des Druckprozesses wird anhand einer Tonermarke der Einfärbungsgrad für das Druckbild indirekt bestimmt und der Druckprozess abhängig vom Druckergebnis bei dieser Tonermarke gesteuert oder geregelt. Auf dem Zwischenträger wird daher neben dem für den Kunden wesentlichen latenten Druckbild auch eine latente Tonermarke erzeugt. Eine derartige Tonermarke ist verglichen mit der Fläche des Druckbildes relativ klein.Contain lines, characters and other, relatively complex picture elements. To precisely control the printing process, the degree of inking for the printed image is indirectly determined using a toner mark and the printing process is controlled or regulated depending on the print result for this toner mark. Therefore, in addition to the latent print image essential for the customer, a latent toner mark is also generated on the intermediate carrier. Such a toner mark is relatively small compared to the area of the printed image.
Bei hohen Farbdichten oder Einfärbungsgraden ist eine hohe Konzentration des Farbstoffes erforderlich, d.h. die zugehörige Tonermarke ist relativ dunkel . Beim Abtasten einer derartigen dunklen Tonermarke durch einen optischen Reflexionssensor ist dessen Empfindlichkeit verringert, d.h. die Kennlinie der Farbdichte auf der Tonermarke über die Tonerkonzentration verläuft relativ flach. Dies hat zur Folge, daß bei hohen Farbdichten die Einstellung der genauen Tonerkonzentration schwierig ist. Dieser Effekt wird noch dadurch vergrößert, daß kleine Flächen dunkler eingefärbt werden als große Flächen, d.h. die relativ kleinen Tonermarken sind dunkler eingefärbt als die größeren Flächenelemente des Druckbildes.With high color densities or degrees of coloring, a high concentration of the dye is required, ie associated toner brand is relatively dark. When such a dark toner mark is scanned by an optical reflection sensor, its sensitivity is reduced, ie the characteristic of the color density on the toner mark over the toner concentration is relatively flat. As a result, it is difficult to set the exact toner concentration at high color densities. This effect is further increased by the fact that small areas are colored darker than large areas, ie the relatively small toner marks are colored darker than the larger area elements of the printed image.
Die DE-A-39 38 354 beschreibt ein Verfahren zum Steuern des Druckprozesses bei einer Bilderzeugungseinrichtung. Beim Erzeugen einer latenten Tonermarke wird die Energie gegenüber der Energie für das Erzeugen eines latenten Druckbildes abgesenkt . Ein Reflexsensor ermittelt die Farbdichte der eingefärbten Tonermarke. Abhängig von dem Signal dieses Reflexsensors wird entweder die Lampenspannung des Zeichengenerators, die Vorspannung für einen Entwicklungsprozeß oder die GitterSpannung des Hauptladers eingestellt. Die Beeinflussung der Tonerkonzentration in der Entwicklungsstation wird nicht beschrieben.DE-A-39 38 354 describes a method for controlling the printing process in an image forming device. When a latent toner mark is generated, the energy is reduced compared to the energy for producing a latent printed image. A reflex sensor determines the color density of the colored toner mark. Depending on the signal of this reflex sensor, either the lamp voltage of the character generator, the bias for a development process or the grid voltage of the main charger is set. The influence on the toner concentration in the development station is not described.
Das Dokument WO 99/36834 derselben Anmelderin beschreibt das Abtasten von Tonermarken mithilfe eines Reflexsensors . Abhängig vom Meßergebnis des Reflexsensors wird die Tonerkonzentration in der Entwicklerstation eingestellt.Document WO 99/36834 by the same applicant describes the scanning of toner marks using a reflex sensor. Depending on the measurement result of the reflex sensor, the toner concentration is set in the developer station.
Das Dokument DE-A-199 00 164 derselben Anmelderin beschreibt das Messen der Tonerdichte einer Tonermarke. Abhängig vom gemessenen Wert wird die Tonerkonzentration eingestellt .Document DE-A-199 00 164 by the same applicant describes the measurement of the toner density of a toner mark. The toner concentration is set depending on the measured value.
Es ist Aufgabe der Erfindung, ein Verfahren und eine Einrichtung zum Steuern des Druckprozesses anzugeben, bei dem auch bei hoher Farbdichte die Tonerkonzentration mit hoher Genauigkeit eingestellt werden kann.It is an object of the invention to provide a method and a device for controlling the printing process which can be used to set the toner concentration with high accuracy even with high color density.
Diese Aufgabe wird für ein Verfahren durch die Merkmale des Anspruchs 1 gelöst .This object is achieved for a method by the features of claim 1.
Gemäß der Erfindung wird die Energie je Flächeneinheit für das Erzeugen der latenten Tonermarke gegenüber der Energie je Flächeneinheit für das Erzeugen des latenten Druckbildes bei sonst gleicher Bildstruktur abgesenkt. Bei elektrofotografischen Druckprozessen z.B. liegt diese Energie in Form von Strahlungsenergie vor. Dies bedeutet, daß bei elektrofotografischen Prozessen diese Strahlungsenergie für das Erzeugen der latenten Tonermarke, die zum Beispiel als Volltonfläche ausgebildet ist, gegenüber der Strahlungsenergie einer gleich großen Volltonfläche des latenten Druckbildes abgesenkt wird. Dies hat zur Folge, daß die Farbdichte der Volltonfläche der Tonermarke geringer ist als die Farbdichte im entsprechenden Druckbild. Demgemäß ist das Signal des Reflexionssensors, der die Tonermarke abtastet, größer; außerdem liegt der Arbeitspunkt des Reflexionssensors auf einer Kennlinie der Farbdichte über die Tonerkonzentration in einem steileren Bereich. Eine Änderung der Farbdichte auf der Tonermarke bewirkt demgemäß eine entsprechend größere Änderung des Signals des Reflexionssensors, wodurch die Tonerkonzentration mit einer höheren Genauigkeit nachgeführt werden kann, um die gewünschte Farbdichte auf dem gedruckten Druckbild zu erzielen.According to the invention, the energy per unit area for the production of the latent toner mark is reduced compared to the energy per unit area for the production of the latent printed image with an otherwise identical image structure. In electrophotographic printing processes e.g. this energy is in the form of radiation energy. This means that in electrophotographic processes, this radiation energy for producing the latent toner mark, which is designed, for example, as a full-tone area, is reduced compared to the radiation energy of an equally large full-tone area of the latent printed image. The result of this is that the color density of the solid tone area of the toner mark is less than the color density in the corresponding printed image. Accordingly, the signal from the reflection sensor that scans the toner mark is larger; in addition, the operating point of the reflection sensor lies on a characteristic curve of the color density over the toner concentration in a steeper range. A change in the color density on the toner mark accordingly brings about a correspondingly greater change in the signal of the reflection sensor, as a result of which the toner concentration can be tracked with a higher accuracy in order to achieve the desired color density on the printed printed image.
Gemäß einem weiteren Aspekt der Erfindung wird eine Einrichtung mit den Merkmalen des Anspruchs ... angegeben. Die mit dieser Einrichtung erzielbaren technischen Effekte sind im Zusammenhang mit dem Verfahren bereits beschrieben. Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Zeichnung erläutert . Darin zeigtAccording to a further aspect of the invention, a device having the features of claim ... is specified. The technical effects that can be achieved with this device have already been described in connection with the method. An embodiment of the invention is explained below with reference to the drawing. In it shows
Fig. 1 schematisch den Aufbau wichtiger Funktionselemente in einem elektrofotografischenFig. 1 shows schematically the structure of important functional elements in an electrophotographic
Drucker,Printer,
Fig. 2 ein Blockschaltbild zur Regelung desFig. 2 is a block diagram for controlling the
Einfärbegrades bei einer Absenkung der Lichtleistung für die Tonermarke,Degree of coloring when the light output for the toner brand is reduced,
Fig. 3 die Einfärberegelung bei normaler und geringer Farbdichte, undFig. 3, the coloring control with normal and low color density, and
Fig. 4 ein Diagramm, welches die Einfärbung auf dem Papier als Druckbildträger abhängig von der Tonerkonzentration zeigt.Fig. 4 is a diagram showing the coloration on the paper as a print carrier depending on the toner concentration.
Fig. 1 zeigt schematisch den Aufbau wichtiger Komponenten einer Einrichtung zum Steuern eines elektrofotografischenFig. 1 shows schematically the structure of important components of a device for controlling an electrophotographic
Druckprozesses. Ein Zeichengenerator 10 ist in Form eines LED-Kammes ausgebildet. Er enthält eine Vielzahl von LEDs, deren Licht auf die Oberfläche einer Fotoleitertrommel 12 ausgesendet wird, um dort latente Bildstrukturen in Form eines Ladungsbildes zu erzeugen. Im Bereich a sendet der Zeichengenerator 10 Licht mit der Lichtleistung Ll aus. Dieser Bereich a ist ein Bereich, in welchem Druckbilder für den Kunden erzeugt werden. In einer daneben geordneten Spur mit dem Bereich b senden die LEDs des Zeichengenerators 10 Licht zum Erzeugen der Struktur einerPrinting process. A character generator 10 is designed in the form of an LED comb. It contains a large number of LEDs, the light of which is emitted onto the surface of a photoconductor drum 12 in order to generate latent image structures in the form of a charge image there. In area a, the character generator 10 emits light with the light output Ll. This area a is an area in which print images are generated for the customer. In an adjacent track with the area b, the LEDs of the character generator 10 send light to generate the structure of a
Tonermarke 14 aus. Dieses Licht hat jedoch eine geringere Lichtleistung L2 als die Lichtleistung Ll im Bereich a für eine gleiche Bildstruktur, im vorliegenden Fall eine ■ Vollton-Bildstruktur. Die mit Toner eingefärbte Marke 14 (der Prozessschritt des Entwickeins mit Toner wurde in der Fig. 1 aus Übersichtsgründen weggelassen) wird auf dem Fotoleiter 12 durch einen Reflexionssensor 16 abgetastet. Dessen elektrisches Signal wird zum Steuern oder Regeln des Druckprozesses ausgenutzt, wie weiter unten noch genauer erläutert wird.Toner mark 14 out. However, this light has a lower light output L2 than the light output L1 in area a for an identical image structure, in the present case a full- tone image structure. The mark 14 colored with toner (the process step of developing with toner has been omitted in FIG. 1 for reasons of clarity) is scanned on the photoconductor 12 by a reflection sensor 16. Its electrical signal is used to control or regulate the printing process, as will be explained in more detail below.
In einem späteren Prozessschritt wird das mit Toner eingefärbte Druckbild 18 auf eine Papierbahn 20 übertragen. Die Tonermarke 14 ist im Druckbild 18 für den Kunden nicht enthalten.In a later process step, the printed image 18 colored with toner is transferred to a paper web 20. The toner mark 14 is not included in the printed image 18 for the customer.
Um das Druckbild für den Kunden mit der gewünschtenTo the print image for the customer with the desired
Farbdichte oder dem gewünschten Einfärbungsgrad zu drucken werden eine Grundeinstellung und weitere Schritte vorgenommen:A basic setting and further steps are carried out to print the color density or the desired degree of coloring:
Schritt a: Es wird das vom Kunden gewünschte Druckbild mit einer am Drucker einstellbaren Farbdichte gedruckt .Step a: The print image requested by the customer is printed with a color density that can be set on the printer.
Schritt b: Mit Hilfe eines Densitometers wird die Farbdichte im Druckbild des Kunden gemessen.Step b: Using a densitometer, the color density in the customer's printed image is measured.
Diese Farbdichte ist ein logarithmisches Maß des Verhältnisses aus Reflexionsgrad des Hintergrunds zum Reflexionsgrad der Bildstruktur.This color density is a logarithmic measure of the ratio of the reflectance of the background to the reflectance of the image structure.
Schritt c: Falls die gewünschte Farbdichte für dasStep c: If the desired color density for the
Druckbild des Kunden nicht erreicht wird, so wird die Tonerkonzentration manuell oder automatisch geändert, bis die tatsächliche Farbdichte mit der gewünschten Farbdichte übereinstimmt .If the customer's print image is not reached, the toner concentration is changed manually or automatically until the actual color density matches the desired color density.
Schritt d: Die Lichtleistung L2 für die Tonermarke ist bei hohen Farbdichten, d.h. bei dunklen Bildstrukturen im Druckbild gegenüber der Lichtleistung Ll abgesenkt. Schritt e: Die Grundeinstellung des Druckprozesses ist abgeschlossen. Beim anschließenden Drucken einer Vielzahl von Seiten wird die Tonerkonzentration so gesteuert oder geregelt, daß die mit der verringertenStep d: The light output L2 for the toner mark is reduced compared to the light output Ll in the case of high color densities, ie in the case of dark image structures in the printed image. Step e: The basic setting of the printing process has been completed. When a plurality of pages are subsequently printed, the toner concentration is controlled or regulated so that the reduced one
Lichtleistung Ll auf der Tonermarke vorhandene Farbdichte konstant bleibt.Light output Ll color density on the toner mark remains constant.
Fig. 2 zeigt in einem Blockschaltbild schematisch die Regelung der Einfärbung bei hoher Farbdichte des Druckbildes für den Kunden. Die Blöcke 22 und 24 beschreiben das Erzeugen des latenten Druckbildes 18 bzw. der latenten Tonermarke 14. Die Lichtenergie L2 der LEDs zum Erzeugen der latenten Tonermarke ist um einen konstanten Faktor gegenüber der Lichtenergie Ll für das Erzeugen des latenten Druckbildes 18 abgesenkt. Beispielsweise kann dies durch Absenken des Stromes erfolgen, der den entsprechenden LEDs des LED-Kammes zugeführt wird. Die eingefärbte Tonermarke wird mit Hilfe des Reflexionssensors 16 abgetastet und die gemesseneFig. 2 shows in a block diagram the control of the coloring with high color density of the printed image for the customer. The blocks 22 and 24 describe the generation of the latent printed image 18 or the latent toner mark 14. The light energy L2 of the LEDs for producing the latent toner mark is reduced by a constant factor compared to the light energy L1 for producing the latent printed image 18. For example, this can be done by lowering the current that is supplied to the corresponding LEDs of the LED comb. The colored toner mark is scanned with the aid of the reflection sensor 16 and the measured one
Farbdichte in einem Signal 26 abgebildet. Dieses Signal 26 stellt einen Istwert des Druckprozesses dar. Dieser Istwert 26 wird mit einem Sollwert 28 verglichen. Dieser Sollwert wurde zuvor in dem weiter oben beschriebenen Einmeßverfahren gemäß Schritt c in einem Probebetrieb festgelegt. Ein Sollwert-Istwert-Vergleicher 30 stellt die Istwertabweichung 32 fest. Aufgrund dieser Abweichung 32 wird die Tonerkonzentration verändert, beispielsweise erhöht oder erniedrigt . Zum Einstellen der Tonerkonzentration kann zum Beispiel auf eineColor density imaged in a signal 26. This signal 26 represents an actual value of the printing process. This actual value 26 is compared with a target value 28. This setpoint was previously determined in the calibration method described above according to step c in a trial run. A setpoint-actual value comparator 30 determines the actual value deviation 32. Because of this deviation 32, the toner concentration is changed, for example increased or decreased. For example, to adjust the toner concentration
Förderwendel, die den Tonertransport zur Entwicklerstation bewerkstelligt, eingewirkt werden. Bei der derart eingeregelten Tonerkonzentration wird das Druckbild 18 und die Tonermarke 14 erzeugt. Das Druckbild 18 wird dann ausgegeben. Fig. 3 zeigt das Beispiel bei normaler und geringer Farbdichte; gleiche Teile sind gleich bezeichnet. Beim Prozess des Erzeugens des latenten Druckbildes 18 und der latenten Tonermarke 14 wird die Absenkung der Energie für das Erzeugen der Tonermarke 14 rückgängig gemacht, d.h. die Lichtleistung L2 ist gleich der Lichtleistung Ll .Conveyor helix, which carries out the toner transport to the developer station. With the toner concentration regulated in this way, the printed image 18 and the toner mark 14 are generated. The printed image 18 is then output. Fig. 3 shows the example with normal and low color density; same parts are labeled the same. In the process of generating the latent printed image 18 and the latent toner mark 14, the lowering of the energy for producing the toner mark 14 is reversed, ie the light output L2 is equal to the light output L1.
Fig. 4 zeigt Kennlinien der Einfärbung in Abhängigkeit von der Tonerkonzentration in der Entwicklerstation. Aufgetragen ist die Farbdichte auf dem bedruckten Papier über die Tonerkonzentration in Prozent . Wenn für die latente Tonermarke 14 und das latente Druckbild 18 bezogen auf sonst gleiche Bildstrukturen jeweils dieselbe Lichtenergie je Flächeneinheit verwendet wird, so ergibt sich die Kennlinie 36. Zu berücksichtigen ist, daß die Tonermarke eine relativ kleine Fläche im Vergleich zum Druckbild 18 hat. Demgemäß ist die Einfärbung dunkler und die Farbdichte erhöht. Die Kennlinie 38 ergibt sich für eine relativ große Fläche des Druckbildes. Die Kennlinie 40 zeigt den Zusammenhang von Tonerkonzentration und4 shows characteristic curves of the coloration as a function of the toner concentration in the developer station. The color density on the printed paper is plotted against the toner concentration in percent. If the same light energy per unit area is used for the latent toner mark 14 and the latent printed image 18, based on otherwise identical image structures, the characteristic curve 36 results. It must be taken into account that the toner mark has a relatively small area in comparison to the printed image 18. Accordingly, the coloring is darker and the color density is increased. The characteristic curve 38 results for a relatively large area of the printed image. The characteristic curve 40 shows the relationship between the toner concentration and
Farbdichte des Druckbildes auf dem Papier, wenn die latente Marke mit einer abgesenkten Lichtleistung L2 erzeugt wird.Color density of the printed image on the paper when the latent mark is generated with a reduced light output L2.
Im Arbeitspunkt mit einer Tonerkonzentration von 5 % ist anhand der Kennlinie 36 zu erkennen, daß eine relativ große Farbdichte auf dem Papier erreicht wird. Diese Kennlinie 36 ist jedoch sehr flach, so daß bei einer Änderung er Tonerkonzentration sich die Farbdichte auf dem Papier kaum mehr ändert, d.h. es liegt ein sehr kleinerAt the operating point with a toner concentration of 5%, it can be seen from the characteristic curve 36 that a relatively large color density is achieved on the paper. However, this characteristic curve 36 is very flat, so that when the toner concentration is changed, the color density on the paper hardly changes, i.e. it is a very small one
Regelhub für den Regelungsprozess vor. Durch Absenken der Lichtleistung kann ein großer Regelhub bei gleicher Tonerkonzentration erreicht werden, wie die Kennlinie 40 zeigt. Die Steigung der Kennlinie oder der Wert des Differentials der Farbdichte auf dem Papier zurControl stroke for the control process. By lowering the light output, a large control stroke can be achieved with the same toner concentration, as the characteristic curve 40 shows. The slope of the characteristic curve or the value of the differential of the color density on the paper
Tonerkonzentration ist bei der Kennlinie 40 in diesem Arbeitspunkt vergrößert. Auf diese Weise wird auch die Regelgenauigkeit zum Regeln des Druckprozesses verbessert . Die Absenkung der Lichtleistung L2 für das Erzeugen der latenten Tonermarke 14 kann umso größer erfolgen, je größer die gewünschte Farbdichte des gedruckten Druckbildes auf dem Papier ist. Die Absenkung derToner concentration is increased at characteristic 40 at this operating point. In this way, too Control accuracy for controlling the printing process improved. The lower the light output L2 for producing the latent toner mark 14, the greater the greater the desired color density of the printed printed image on the paper. Lowering the
Lichtleistung L2 für die Tonermarke 14 kann auch derart erfolgen, daß das Verhältnis oder der Differentialquotient aus Tonerkonzentration und Farbdichte im Arbeitspunkt des Reflexionssensors 16 einen vorgegebenen Wert überschreitet.Light output L2 for the toner mark 14 can also take place in such a way that the ratio or the differential quotient of the toner concentration and color density at the operating point of the reflection sensor 16 exceeds a predetermined value.
Wie anhand der Fig. 4 zu erkennen ist, sind die Kennlinien 36, 38, 40 nicht linear. Im Bereich kleiner Tonerkonzentrationen ist eine ausreichende Steigung der Kennlinie 36 vorhanden. Dies bedeutet, daß eine Absenkung der Lichtleistung L2 für die Tonermarke 14 nicht mehr unbedingt erforderlich ist und rückgängig gemacht werden kann. Daher wird bei einem Ausführungsbeispiel der Erfindung ab einem Farbdichtewert < einem vorgegebenen Schwellwert die Absenkung der Lichtleistung rückgängig gemacht .As can be seen from FIG. 4, the characteristic curves 36, 38, 40 are not linear. A sufficient slope of the characteristic curve 36 is present in the range of small toner concentrations. This means that a lowering of the light output L2 for the toner mark 14 is no longer absolutely necessary and can be reversed. Therefore, in one embodiment of the invention, the reduction in light output is reversed from a color density value <a predetermined threshold value.
Es sind zahlreiche Varianten der beschriebenen Erfindung möglich. Beispielsweise kann der Zwischenträger, auf dem die Tonermarke 14 aufgebracht wird, auch einNumerous variants of the described invention are possible. For example, the intermediate carrier on which the toner mark 14 is applied can also be a
Fotoleiterband sein. Die Erfindung kann auch für elektromagnetische. Druckverfahren angewendet werden. Auch ist es möglich, die Tonermarke 14 auf ein Transferband zu übertragen, und diese Tonermarke 14 auf dem Transferband abzutasten. Weiterhin ist es möglich, dieBe a photo conductor tape. The invention can also be used for electromagnetic. Printing processes are applied. It is also possible to transfer the toner mark 14 onto a transfer belt and to scan this toner mark 14 on the transfer belt. It is also possible to
Tonerkonzentration anhand vorgegebener Kennlinien einzustellen, die den Zusammenhang zwischen Farbdichte auf dem Trägermaterial und der Tonerkonzentration bei abgesenkter Energie für die Erzeugung der latenten Marke wiedergeben. BezugszeichenlisteAdjust the toner concentration on the basis of predetermined characteristic curves which reflect the relationship between the color density on the carrier material and the toner concentration with reduced energy for the generation of the latent mark. LIST OF REFERENCE NUMBERS
10 Zeichengenerator10 character generator
12 Fotoleitertrommer12 photoconductor drums
14 Tonermarke14 toner mark
16 Reflexionssensor16 reflection sensor
18 Druckbild18 printed image
20 Papierbahn20 paper web
22 Funktionsblock22 function block
24 Funktionsblock24 function block
26 Signal26 signal
28 Sollwert28 setpoint
30 Sollwert-Istwert-Vergleich30 Setpoint-actual value comparison
32 Istwert-Abweichung32 Actual value deviation
36 Kennlinie36 characteristic curve
38 Kennlinie38 characteristic curve
40 Kennlinie40 characteristic curve
Ll Lichtleistung a Bereich b BereichLl light output a area b area
L2 Lichtleistung L2 light output
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10136259A DE10136259A1 (en) | 2001-07-25 | 2001-07-25 | Method for controlling a printing process in a printer or copier uses a character generator to produce a toner mark on an intermediate carrier and a reflection sensor to determine color density for a colored toner mark |
| DE10136259 | 2001-07-25 | ||
| PCT/EP2002/008260 WO2003012553A1 (en) | 2001-07-25 | 2002-07-24 | Method and device for controlling a print process with high colour density |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1410113A1 true EP1410113A1 (en) | 2004-04-21 |
| EP1410113B1 EP1410113B1 (en) | 2008-07-09 |
Family
ID=7693065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02758387A Expired - Lifetime EP1410113B1 (en) | 2001-07-25 | 2002-07-24 | Method and device for controlling a print process with high colour density |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7016620B2 (en) |
| EP (1) | EP1410113B1 (en) |
| DE (2) | DE10136259A1 (en) |
| WO (1) | WO2003012553A1 (en) |
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| DE10233671A1 (en) | 2002-07-24 | 2004-02-05 | OCé PRINTING SYSTEMS GMBH | Method and device for adjusting the toner concentration in the developer station of an electrophotographic printer or copier |
| US20050214015A1 (en) * | 2004-03-25 | 2005-09-29 | Eastman Kodak Company | Densitometer for use in a printer |
| KR101265264B1 (en) | 2006-07-31 | 2013-05-16 | 삼성전자주식회사 | Method and apparatus for estimating toner density using toner image, method and apparatus for supplying toner using thereof |
| DE102006058580A1 (en) | 2006-12-12 | 2008-06-26 | OCé PRINTING SYSTEMS GMBH | Method and device for adjusting the dot size of printed images produced by means of an electrophotographic printing or copying system |
| DE102006058579A1 (en) | 2006-12-12 | 2008-06-26 | OCé PRINTING SYSTEMS GMBH | A method and apparatus for processing a measurement signal to detect a property of a toner mark |
| DE102007001687B4 (en) | 2007-01-11 | 2015-09-03 | Océ Printing Systems GmbH & Co. KG | A method and apparatus for processing a measurement signal to detect a property of a toner mark |
| DE102007009070A1 (en) | 2007-02-23 | 2008-08-28 | OCé PRINTING SYSTEMS GMBH | Method and device for detecting an electric potential as well as electrical charges on a printer or copier |
| DE102008030972A1 (en) * | 2008-06-30 | 2009-12-31 | OCé PRINTING SYSTEMS GMBH | Method for determining the character width of characters constructed from printing dots in a printer or copier |
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| US10555412B2 (en) | 2018-05-10 | 2020-02-04 | Applied Materials, Inc. | Method of controlling ion energy distribution using a pulse generator with a current-return output stage |
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| US5293198A (en) * | 1990-08-10 | 1994-03-08 | Ricoh Company, Ltd. | Image forming apparatus for controlling the dynamic range of an image |
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| JPH063931A (en) * | 1992-06-23 | 1994-01-14 | Ricoh Co Ltd | Image forming device |
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| JP3536407B2 (en) * | 1995-03-07 | 2004-06-07 | ミノルタ株式会社 | Digital image forming equipment |
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- 2001-07-25 DE DE10136259A patent/DE10136259A1/en not_active Ceased
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2002
- 2002-07-24 US US10/486,372 patent/US7016620B2/en not_active Expired - Fee Related
- 2002-07-24 WO PCT/EP2002/008260 patent/WO2003012553A1/en not_active Ceased
- 2002-07-24 EP EP02758387A patent/EP1410113B1/en not_active Expired - Lifetime
- 2002-07-24 DE DE50212480T patent/DE50212480D1/en not_active Expired - Lifetime
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| Title |
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| See references of WO03012553A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20040234285A1 (en) | 2004-11-25 |
| WO2003012553A1 (en) | 2003-02-13 |
| DE50212480D1 (en) | 2008-08-21 |
| US7016620B2 (en) | 2006-03-21 |
| EP1410113B1 (en) | 2008-07-09 |
| DE10136259A1 (en) | 2003-02-20 |
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