EP0226750B1 - Verfahren zur elektrostatischen Farbbildherstellung durch Bildumkehr - Google Patents

Verfahren zur elektrostatischen Farbbildherstellung durch Bildumkehr Download PDF

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Publication number
EP0226750B1
EP0226750B1 EP19860114668 EP86114668A EP0226750B1 EP 0226750 B1 EP0226750 B1 EP 0226750B1 EP 19860114668 EP19860114668 EP 19860114668 EP 86114668 A EP86114668 A EP 86114668A EP 0226750 B1 EP0226750 B1 EP 0226750B1
Authority
EP
European Patent Office
Prior art keywords
color toner
photoconductor
donor member
areas
toner layer
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
Application number
EP19860114668
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English (en)
French (fr)
Other versions
EP0226750A1 (de
Inventor
Josef Matkan
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.)
Stork Colorproofing BV
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Stork Colorproofing BV
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.)
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Publication date
Application filed by Stork Colorproofing BV filed Critical Stork Colorproofing BV
Priority to AT86114668T priority Critical patent/ATE54377T1/de
Publication of EP0226750A1 publication Critical patent/EP0226750A1/de
Application granted granted Critical
Publication of EP0226750B1 publication Critical patent/EP0226750B1/de
Expired legal-status Critical Current

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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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies

Definitions

  • This invention relates to electrophotography and in particular to a novel method of preparing by an electrophotographic process multicolor pre-press proofs from negative color separation films..
  • pre-press proofs as is well known in the art is to assess color balance and strength which can be expected from the final press run and accordingly to correct the separation transparencies before the printing plates are made therefrom. In many instances it is also required to produce so-called customer proofs for approval of subject, composition and general appearance of the print prior to press run. Thus it is essential that the pre-press proof should have the same appearance as the press print, that is to say in addition to matching the colors of the press print, the pre-press proof should be on the same paper as the press print.
  • the color separation transparencies are accepted or corrected if found necessary and then used for the preparation of printing plates.
  • positive working and negative working printing plates There are so-called positive working and negative working printing plates, as is well known in the art.
  • a positive working printing plate is exposed to a positive transparency or film positive wherein the information to be printed corresponds directly to opaque areas whereas the non-printing background areas correspond to transparent areas contained on such film positive.
  • the exposed areas contained thereon are rendered removable by chemical treatment and the underlying usually grained aluminium plate surface forms then the water receptive non-printing or non-image areas whereas the unexposed areas contained thereon form the ink receptive printing or image areas during the subsequent lithographic or offset printing.
  • a negative working printing plate is exposed to light through a film negative wherein the information to be printed corresponds to transparent areas whereas the non-printing background areas correspond to opaque areas contained on such film negative.
  • the exposed areas become photohardened and form the ink receptive printing areas whereas the unexposed areas are removed by chemical treatment and the underlying water receptive usually grained aluminium plate surface forms the non-printing or non-image areas during subsequent lithographic or offset printing.
  • pre-press proofing processes containing in general four colors, such as yellow, magenta, cyan and black.
  • pre-press proofing processes are disclosed for instance in United States Patents Numbers 3,337,340, 3,419,411 and 3,862,848.
  • Prior art electrophotographic pre-press proofing processes are not suitable for the proofing of film negatives used for the preparation of negative working printing plates that is to say such processes are not suitable for the reversal reproduction of imagery wherein the transparent areas contained on a film negative are to be reproduced as the image areas on the pre-press proof.
  • Reversal reproduction per se by electrophotography is well known in the art but the processes employed for this purpose are not suitable for multicolor pre-press proofing.
  • Reversal image reproduction in electrophotography is normally carried out according to prior art practices by means of so-called repulsion toning.
  • This process comprises the steps of electrostatically charging the surface of a photoconductor to a polarity, typically charging an n-type photoconductor such as zinc oxide to negative polarity, exposing said surface to a film negative containing the image to be reproduced in the form of transparent areas and the non-image part in the form of opaque areas whereby the photoconductor surface becomes discharged in the exposed image areas while retaining the charge in the unexposed non-image areas and applying to said surface toner material having the same polarity as that of the charges contained on said surface, typically applying negative toner material to a negatively charged n-type photoconductor surface, whereby such toner material is repelled from the charged non-image areas onto the discharged image areas forming toner deposits thereon corresponding to the image to be reproduced.
  • the thus formed image deposits in certain instances are fused to the photoconductor surface whereas in other
  • the invention provides a method of electrostatographic image reversal wherein a positive print comprising a receptor sheet having image-free areas and image areas formed by color toner deposits is produced from a negative film having opaque areas corresponding to the image-free areas on said print and transparent areas corresponding to the image areas on said print, said method characterized by the steps of electrostatically charging a photoconductor to deposit thereon uniformly charges of a first polarity, exposing said photoconductor to light through a negative film thereby to discharge said photoconductor in the areas corresponding to said transparent areas of said negative film while retaining said charges thereon in areas corresponding to said opaque areas of said negative film, forming a uniform color toner layer of a second polarity on a donor member, effecting a virtual contact between said photoconductor and said color toner layer on said donor member to thereby transfer portions of said color toner layer to said photoconductor by attraction to said retained charges thereon while preserving said color toner layer on said donor member in the form of color toner
  • FIG. 1 a photoconductive recording member 1 comprising a photoconductive layer 2 on a conductive support 3, uniformly charged to negative polarity as indicated by the negative charges 4.
  • a film negative separation of the first color 5 containing opaque final background or non-image areas 6 and transparent final image areas 7 is placed in contact with photoconductive recording member 1 for contact exposure through light source 8.
  • Figure 2 is illustrated the photoconductive recording member 1 after exposure, having retained negative electrostatic charges 4 only in the areas corresponding to opaque areas of negative film separation 5 of Figure 1.
  • a donor member 9 comprising for instance a metal cylinder, partially immersed in liquid toner of the first color 10 containing therein suspended positive toner particles 11.
  • the liquid toner 10 is contained within tank 12.
  • An electrode 13 which may be in the shape of a knife-edge, is placed within tank 12 beneath donor member 9 spaced a short distance apart therefrom. Electrode 13 is connected to the positive terminal of power supply 14, the negative terminal of same being grounded.
  • Donor member 9 is also grounded, whereby an electrophoretic cell is formed wherein donor member 9 and electrode 13 constitute the two electrodes of opposite polarity.
  • Photoconductive recording member 1 is caused to traverse in the direction shown at the same linear speed as the circumferential speed of donor member 9, its photoconductive surface 2 containing after exposure residual negative charges 4 thereon being in virtual contact with rotating donor member 9, its conductive support 3 being grounded.
  • toner layer 15 is split, in that portion of toner layer 15 contacting the photoconductive surface 2 where electrostatic charges 4 are contained thereon are attracted and transferred thereto whereas those portions of toner layer 15 contacting areas on photoconductive layer 2 which, due to preceding exposure are free of electrostatic charges, remain thereon.
  • the remaining portion 16 of toner layer 15 on donor member 9 corresponds to the transparent final image areas 7 of film negative 5 in Figure 1.
  • the toner deposits forming said remaining portion 16 are electrostatically transferred onto receptor member such as printing stock 17 and the circumferential speed of transfer roll 19 being the same as the circumferential speed of donor member 9.
  • Electrostatic transfer is effected by connecting transfer roll 19 to the negative terminal of power supply 20, the positive terminal of which is grounded. It will be seen that transferred first color toner deposits 18 on printing stock 17 are contained thereon in areas corresponding to the final transparent image areas 7 of first color separation film negative 5 as shown in Figure 1 and thus a reversal reproduction, that is to say a positive print from a negative film has been produced by toner transfer based on attraction throughout.
  • the above disclosed steps are repeated in succession with negative film separations of subsequent colors and corresponding color toners.
  • the receptor member or printing stock carrying thereon the preceding color toner deposits is moved around the transfer roll in register with the donor member to ensure that all color images are transferred to the printing stock in exact register with each other.
  • the color separation film negatives are placed in register with the photoconductive recording member during contact exposure, and as the photoconductive member traverses the donor member for transfer toning, registration means are provided to ensure exact coincidence between corresponding image areas on the photoconductive surface and the donor member surface.
  • electrostatic transfer from the donor member onto the printing stock has been illustrated by means of a roll comprising for instance a conductive core connected to the terminal of the power supply and a cover layer of semi-conductive elastomer, as is well known in the art, however other well known means for eleotrostatic transfer such as a corona generator can be employed equally well to serve the same purpose.
  • transfer of color toner deposits from the donor member onto the receiving member may be effected by methods other than electrostatic, such as for instance by pressure, adhesion, heat and/or embedment in a receptor coating on the receiving member.
  • the photoconductive member has been illustrated as a flat plate and the donor member as a cylinder, it should be realized that the photoconductive member may be cylindrical and the donor member flat, or both members can be flat or cylindrical, or either or both members can be in the form of belts, if so desired.
  • the receptor member instead of being a flexible paper sheet as illustrated can comprise a rigid material such as cardboard or metal plate, in which case of course appropriate re-arrangement of the transfer from the donor to the receptor member will be required, as would be obvious to those skilled in the art.
  • FIG. 3 comprises only the essential elements of the present invention, and it should be realized that in practice it may be desirable to incorporate other elements as are commonly used in electrostatographic equipment for improving performance and/or image quality, such as for instance a doctor blade or corona generator means to control the quantity of carrier liquid over the toner layer formed on the donor member, means to wet the photoconductor surface with carrier liquid type solvent before and/or after transfer toning, cleaning means to remove toner layer portions from the photoconductive surface preparatory to oharging for a following color, means to wet with carrier liquid type solvent the donor member and/or the receptor member prior to toner deposit transfer, and the like.
  • a doctor blade or corona generator to control the quantity of carrier liquid over the toner layer formed on the donor member, means to wet the photoconductor surface with carrier liquid type solvent before and/or after transfer toning, cleaning means to remove toner layer portions from the photoconductive surface preparatory to oharging for a following color, means to wet with carrier liquid type solvent the donor member and
  • An important feature of this invention consists in the capability to precisely predetermine the thickness of the toner layer formed on the donor member as a function of the electrophoretic mobility of specific toners, toner concentration, the gap between electrode and donor member, electrode voltage and speed of rotation of donor member.
  • Color toners usable in the process of the present invetion may be for example as disclosed in U.S. Patent No. 3,998,746 of Tsuneda, U.S. Patent 3,820,986 of Fukashima et al., and U.S. Patent . 3,419,411 of Wright.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)

Claims (10)

1. Verfahren zur elektrostatographischen Bildumkehr, bei welchem ein positiver Abdruck mit einem Empfängerblatt, das bildfreie Bereiche und bildinformationshaltige Bereiche aufweist, welche durch Farbtonerablagerungen erzeugt werden, mittels eines Negativfilms gebildet wird, der undurchsichtige Bereiche entsprechend den bildfreien Bereichen auf dem genannten Abdruck und transparente Bereiche aufweist, die den genannten bildinformationshaltigen Bereichen auf dem- Abdruck entsprechen, gekennzeichnet durch folgende Verfahrensschritte:
A. Elektrostatisches Aufladen eines Fotoleiters, um auf ihm eine gleichförmige Aufladung einer ersten Polarität zu erzeugen;
B. Belichten des Fotoleiters durch einen Negativfilm hindurch, derart, daß der Fotoleiter in den Bereichen entsprechend den genannten transparenten Bereichen des Negativfilms entladen wird, während die Ladungen auf dem Fotoleiter in Bereichen entsprechend den genannten undurchsichtigen Bereichen des Negativfilms erhalten bleiben;
C. Bilden einer gleichförmigen Farbtonerschicht einer zweiten Polarität auf einem Spenderelement;
D. Herbeiführen einer wirksamen Berührung zwischen dem genannten Fotoleiter und der besagten Farbtonerschicht auf dem Spenderelement, um Teile der Farbtonerschicht auf den Fotoleiter durch Anziehung an die aufrechterhaltenen Ladungen auf dem Fotoleiter zu übertragen, während die Farbtonerschicht auf dem genannten Spenderelement in Gestalt von Farbtonerablagerungen in den übrigen Teilen des Spenderelementes verbleibt;
E. Übertragen der Farbtonerablagerungen von dem Spenderelement auf ein Empfängerblatt; und
F. Fixieren der Farbtonerablagerungen auf dem Empfängerblatt.
2. Verfahren zur elektrostatographischen Bildumkehr nach Anspruch 1, dadurch gekennzeichnet, daß eine Mehrzahl negativer Farbauszugsfilme aufeinanderfolgender Farben und entsprechende Farbtoner der Reihe nach verwendet werden, um einen mehrfarbigen Abdruck zu erzeugen, der das genannte Empfängerblatt aufweist, das bildfreie Bereiche und bildinformationshaltige Bereiche enthält, die durch mehrfache Farbtonerablagerungen in Ausrichtung aufeinander erzeugt sind, wobei die Verfahrensschritte der Übertragung des genannten Toners und der genannter Farbtonerablagerungen jeweils in Ausrichtung erfolgt und die Farbtonerabiagerungen auf dem Empfängerblatt anschließend an die letzte Ablagerung von Toner auf dem Empfängerblatt erfolgt und wobei die Verfahrensschritte A bis F mit den Farbauszugsfilmen und den jeweiligen Farbtonern wiederholt werden.
3. Verfahren zur elektrostatographischen Bildumkehr nach Anspruch 2, dadurch gekennzeichnet, daß die Teile der ersten Farbtonerschicht, welche auf den Fotoleiter übertragen worden ist, von diesem entfernt werden, bevor die nächste Farbtonerschicht, welche aufzubringen ist, abgelagert wird.
4. Verfahren zur elektrostatographischen Bildumkehr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Bildung jeder Farbtonerschicht auf dem Spenderelement durch elektrophoretische Ablagerung erfolgt.
5. Verfahren zur elektrostatographischen Bildumkehr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Farbtonerablagerungen elektrostatisch von dem Spenderelement auf das Empfängerblatt übertragen werden.
6. Verfahren zur elektrostatographischen Bildumkehr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die genannten zweite Polarität entgegengesetzt zu der Polarität der Ladungen ist, welche auf den Fotoleiter aufgebracht worden sind.
7. Verfahren zur elektrostatographischen Bildumkehr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die gleichförmige Farbtonerschicht auf dem Spenderelement durch elektrophoretische Ablagerung bis zum Erreichen einer vorbestimmten Dicke erfolgt.
8. Verfahren zur elektrostatographischen Bildumkehr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die optische Dichte der Farbtonerablagerungen auf dem Empfängerblatt, welches diese Ablagerungen von dem Spenderelement erhält, durch die Dicke der gleichförmigen Farbtonerschicht, die auf dem Spenderelement erzeugt wird, gesteuert wird.
9. Verfahren zur elektrostatographischen Bildumkehr, nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Fotoleiter sich auf einem leitfähigen Träger befindet und daß der leitfähige Träger und das Spenderelement elektrisch angeschlossen werden, während der Fotoleiter in Berührung mit der Farbtonerschicht auf dem Spenderelement gebracht wird, um dadurch Teile der Farbtonerschicht auf den Fotoleiter zu übertragen.
10. Verfahren zur elektrostatographischen Bildumkehr nach Anspruch 9, dadurch gekennzeichnet, daß der leitfähige Träger und das Spenderelement auf unterschiedlichem elektrischen Potential relativ zueinander gehalten werden, während der Fotoleiter in Berührung mit der Farbtonerschicht gebracht wird.
EP19860114668 1985-10-31 1986-10-22 Verfahren zur elektrostatischen Farbbildherstellung durch Bildumkehr Expired EP0226750B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114668T ATE54377T1 (de) 1985-10-31 1986-10-22 Verfahren zur elektrostatischen farbbildherstellung durch bildumkehr.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPH319285 1985-10-31
AU3192/85 1985-10-31
AU64346/86A AU581790B2 (en) 1985-10-31 1986-10-31 Method of electrostatic colour proofing by image reversal

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EP0226750A1 EP0226750A1 (de) 1987-07-01
EP0226750B1 true EP0226750B1 (de) 1990-07-04

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EP19860114668 Expired EP0226750B1 (de) 1985-10-31 1986-10-22 Verfahren zur elektrostatischen Farbbildherstellung durch Bildumkehr

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AU (1) AU581790B2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02501957A (ja) * 1987-01-15 1990-06-28 ストルク　コロルプルーフィング　ビー　ベー イメージ反転プロセス
AU598702B2 (en) * 1987-12-01 1990-06-28 Stork Colorproofing B.V. Electrostatic proofing of negative color separations
USRE37859E1 (en) 1991-07-09 2002-09-24 Indigo N.V. Development control system
WO1993001531A1 (en) * 1991-07-09 1993-01-21 Spectrum Sciences B.V. Latent image development apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU473306B2 (en) * 1970-10-08 1976-06-17 Research Laboratories Of Australia Pty Ltd Method of and means for the developmetn of electrostatic images
US4021586A (en) * 1970-10-08 1977-05-03 Canon Kabushiki Kaisha Method of and means for the development of electrostatic images
US3862848A (en) * 1971-12-24 1975-01-28 Australia Res Lab Transfer of color images
DE2525405A1 (de) * 1974-06-07 1976-03-04 Australia Res Lab Verfahren zur druckinduzierten entwicklung elektrostatischer latenter bilder
JPS53113551A (en) * 1977-03-15 1978-10-04 Fuji Photo Film Co Ltd Developing device
US4358195A (en) * 1980-04-11 1982-11-09 Coulter Systems Corporation Electrophotographic color proofing apparatus
DD215879A1 (de) * 1983-05-31 1984-11-21 Univ Magdeburg Tech Einrichtung und verfahren zur bildmaessigen elektrofotografischen entwicklung
AU3987785A (en) * 1984-02-14 1985-09-12 Coulter Systems Corp. Multicolour electrostatic duplicator

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Publication number Publication date
AU581790B2 (en) 1989-03-02
EP0226750A1 (de) 1987-07-01
AU6434686A (en) 1987-05-07

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