EP1410113A1 - Procede et dispositif pour piloter un processus d'impression avec une forte densite chromatique - Google Patents

Procede et dispositif pour piloter un processus d'impression avec une forte densite chromatique

Info

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
Application number
EP02758387A
Other languages
German (de)
English (en)
Other versions
EP1410113B1 (fr
Inventor
Volkhard Maess
Hans Winter
Christian Scholz
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP1410113A1 publication Critical patent/EP1410113A1/fr
Application granted granted Critical
Publication of EP1410113B1 publication Critical patent/EP1410113B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de piloter un processus d'impression dans une imprimante ou dans une photocopieuse. Un repère de toner est produit sur un support intermédiaire (12) par un générateur de caractères (10), avec une énergie réduite comparativement à celle requise pour produire l'image imprimée (18), avec par ailleurs une structure d'image identique. Un détecteur de réflexion (16) détermine la densité chromatique du repère de toner (14) coloré et ajuste la concentration en toner dans un poste de développement en fonction d'un signal.
EP02758387A 2001-07-25 2002-07-24 Procede et dispositif pour piloter un processus d'impression avec une forte densite chromatique Expired - Lifetime EP1410113B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10136259A DE10136259A1 (de) 2001-07-25 2001-07-25 Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher Farbdichte
DE10136259 2001-07-25
PCT/EP2002/008260 WO2003012553A1 (fr) 2001-07-25 2002-07-24 Procede et dispositif pour piloter un processus d'impression avec une forte densite chromatique

Publications (2)

Publication Number Publication Date
EP1410113A1 true EP1410113A1 (fr) 2004-04-21
EP1410113B1 EP1410113B1 (fr) 2008-07-09

Family

ID=7693065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02758387A Expired - Lifetime EP1410113B1 (fr) 2001-07-25 2002-07-24 Procede et dispositif pour piloter un processus d'impression avec une forte densite chromatique

Country Status (4)

Country Link
US (1) US7016620B2 (fr)
EP (1) EP1410113B1 (fr)
DE (2) DE10136259A1 (fr)
WO (1) WO2003012553A1 (fr)

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DE10233671A1 (de) 2002-07-24 2004-02-05 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Einstellen der Tonerkonzentration in der Entwicklerstation eines elektrofotografischen Druckers oder Kopierers
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KR101265264B1 (ko) 2006-07-31 2013-05-16 삼성전자주식회사 테스트 패턴을 이용한 토너농도 추정 방법 및 장치, 이를이용한 토너 공급 방법 및 장치
DE102006058579A1 (de) 2006-12-12 2008-06-26 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Verarbeiten eines Messsignals zum Erfassen einer Eigenschaft einer Tonermarke
DE102006058580A1 (de) 2006-12-12 2008-06-26 OCé PRINTING SYSTEMS GMBH Verfahren und Anordnung zum Einstellen der Punktgröße von mit Hilfe eines elektrografischen Druck- oder Kopiersystems erzeugten Druckbildern
DE102007001687B4 (de) 2007-01-11 2015-09-03 Océ Printing Systems GmbH & Co. KG Verfahren und Vorrichtung zum Verarbeiten eines Messsignals zum Erfassen einer Eigenschaft einer Tonermarke
DE102007009070A1 (de) 2007-02-23 2008-08-28 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Erfassen eines elektrischen Potentials sowie von elektrischen Ladungen ein einem Drucker oder Kopierer
DE102008030972A1 (de) * 2008-06-30 2009-12-31 OCé PRINTING SYSTEMS GMBH Verfahren zur Ermittlung der Zeichenbreite von aus Druckpunkten aufgebauten Zeichen bei einem Druck- oder Kopiergerät
US10510575B2 (en) 2017-09-20 2019-12-17 Applied Materials, Inc. Substrate support with multiple embedded electrodes
US10714372B2 (en) 2017-09-20 2020-07-14 Applied Materials, Inc. System for coupling a voltage to portions of a substrate
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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KR102827481B1 (ko) 2019-01-22 2025-06-30 어플라이드 머티어리얼스, 인코포레이티드 펄스 전압 파형을 제어하기 위한 피드백 루프
US11508554B2 (en) 2019-01-24 2022-11-22 Applied Materials, Inc. High voltage filter assembly
US11462389B2 (en) 2020-07-31 2022-10-04 Applied Materials, Inc. Pulsed-voltage hardware assembly for use in a plasma processing system
US11901157B2 (en) 2020-11-16 2024-02-13 Applied Materials, Inc. Apparatus and methods for controlling ion energy distribution
US11798790B2 (en) 2020-11-16 2023-10-24 Applied Materials, Inc. Apparatus and methods for controlling ion energy distribution
US11495470B1 (en) 2021-04-16 2022-11-08 Applied Materials, Inc. Method of enhancing etching selectivity using a pulsed plasma
US11948780B2 (en) 2021-05-12 2024-04-02 Applied Materials, Inc. Automatic electrostatic chuck bias compensation during plasma processing
US11791138B2 (en) 2021-05-12 2023-10-17 Applied Materials, Inc. Automatic electrostatic chuck bias compensation during plasma processing
US11967483B2 (en) 2021-06-02 2024-04-23 Applied Materials, Inc. Plasma excitation with ion energy control
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US11810760B2 (en) 2021-06-16 2023-11-07 Applied Materials, Inc. Apparatus and method of ion current compensation
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Also Published As

Publication number Publication date
DE10136259A1 (de) 2003-02-20
WO2003012553A1 (fr) 2003-02-13
DE50212480D1 (de) 2008-08-21
US20040234285A1 (en) 2004-11-25
EP1410113B1 (fr) 2008-07-09
US7016620B2 (en) 2006-03-21

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