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EP0672967A2 - Méthode et appareil de formation d'images utilisant un élément de transfert intermédiaire - Google Patents

Méthode et appareil de formation d'images utilisant un élément de transfert intermédiaire Download PDF

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Publication number
EP0672967A2
EP0672967A2 EP95201534A EP95201534A EP0672967A2 EP 0672967 A2 EP0672967 A2 EP 0672967A2 EP 95201534 A EP95201534 A EP 95201534A EP 95201534 A EP95201534 A EP 95201534A EP 0672967 A2 EP0672967 A2 EP 0672967A2
Authority
EP
European Patent Office
Prior art keywords
image
intermediate transfer
transfer member
liquid
toner particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95201534A
Other languages
German (de)
English (en)
Other versions
EP0672967A3 (fr
Inventor
Benzion Landa
Ishaiau Lior
Hanna Pinhas
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.)
HP Indigo BV
Original Assignee
Indigo 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.)
Filing date
Publication date
Application filed by Indigo BV filed Critical Indigo BV
Publication of EP0672967A2 publication Critical patent/EP0672967A2/fr
Publication of EP0672967A3 publication Critical patent/EP0672967A3/fr
Withdrawn legal-status Critical Current

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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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0173—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member plural rotations of recording member to produce multicoloured copy, e.g. rotating set of developing units
    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/0174—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member plural rotations of recording member to produce multicoloured copy
    • 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
    • G03G2215/06—Developing structures, details
    • G03G2215/0602—Developer
    • G03G2215/0626—Developer liquid type (at developing position)

Definitions

  • the present invention relates generally to imaging apparatus and techniques and more particularly to apparatus and techniques for transfer of images from an image-bearing surface to a substrate via an intermediate transfer medium.
  • U.S. Patent 4,684,238 describes intermediate transfer apparatus in which a plurality of liquid images, which include a liquid carrier having toner particles dispersed therein, are attracted from a photoconductive member to an intermediate belt. Liquid carrier is removed from the intermediate belt by vacuum apparatus and the toner particles are compacted on the intermediate belt in image configuration. Thereafter, the toner particles are transferred from the intermediate belt to the copy sheet in image configuration by electrostatic attraction.
  • U.S. Patent 4,690,539 shows a system similar to that shown in U.S. Patent 4,684,238 which is suitable for multi-color multiple-pass electrophoretic image transfer.
  • U.S. Patent 4,015,027 describes an electrophotographic toner transfer and fusing method wherein a heated roller or belt is employed for pressure transfer of dry toner images from an intermediate transfer medium onto paper.
  • line 29 - column 12 line 38 there appears a detailed discussion of heating of images upon transfer thereof as proposed therein and as taught in the prior art including specifically U.S. Patent 3,591,276 to Byrne.
  • a belt construction characterized in that it has a very low heat capacitance and a thickness of between 15 and about 200 microns is proposed in U.S. Patent 4,015,027.
  • the belt comprises a 50 micron layer of aluminized Kapton having a 25 micron coating of silicon rubber.
  • Another embodiment employs a 12.5 micron layer of stainless steel instead of the Kapton together with a silicon rubber coating.
  • a reflecting layer is incorporated in the belt to reduce heating thereof.
  • U.S. Patent 4,796,048 describes a system for transferring a liquid toner image from a photoconductive member to an intermediate transfer member for subsequent transfer to a copy sheet.
  • the liquid toner image is heated to remove solvent associated with the toner image.
  • the toner particles are melted to thermally offset the image to the copy sheet.
  • U. S. Patent 4,708,460 describes a system for transferring a liquid toner image from a photoconductive member to an intermediate transfer member for subsequent transfer to a copy sheet.
  • the liquid toner image is heated by radiant heat on the intermediate transfer member to vaporize some of the liquid carrier and to partially melt the toner particles, decreasing their viscosity.
  • heat substantially vaporizes the remainder of the liquid carrier from the image and fuses the image to the copy sheet.
  • the present invention seeks to provide improved imaging apparatus.
  • apparatus for transfer of a liquid toner image (containing carrier liquid and toner particles which solvate the carrier liquid at a solvation temperature above room temperature) from an image bearing surface to a substrate
  • the apparatus comprising: an intermediate transfer member arranged in operative association with the image bearing surface, first transfer means operative for transferring the image from the image bearing surface onto the intermediate transfer member, and heating apparatus operative for heating the image on the intermediate transfer member to a temperature above the solvation temperature, below the melting point of the toner particles and below the boiling point of the carrier liquid prior to transfer of the image to the substrate so as to cause the image to adhere to the substrate.
  • the apparatus also comprises second transfer means operative for transferring the heated image from the intermediate transfer member to a substrate, the second transfer means being operative for cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • the second transfer means in conjunction with the substrate is operative to cool the image sufficiently such that the adhesion of the image to the intermediate transfer member is less than the cohesion of the image.
  • the first transfer means includes, in a preferred embodiment of the invention, apparatus for transferring multiple images from the image bearing surface onto the intermediate transfer member.
  • the toner particles in the liquid toner image are pigmented.
  • the heating apparatus is operative to heat the image such that the image remains at a temperature above the solvation temperature until contact of the image with the substrate.
  • the intermediate transfer member comprises a thin walled cylinder preferably with a thickness of less than 125 microns. In alternative preferred embodiments the wall thickness may be less than 50, less than 30 or less than 7 microns.
  • the thin walled cylinder includes metallic material. In a preferred embodiment the thin walled cylinder comprises a layer of polymer material and a thin release layer.
  • the intermediate transfer member includes a relatively heat conductive inner layer and a relatively heat insulative outer layer.
  • the intermediate transfer member has a low effective heat capacity such that the surface temperature of the intermediate transfer member is substantially reduced during transfer of an image therefrom onto substrate.
  • a method for transfer of a liquid toner image (containing carrier liquid and toner particles which solvate the carrier liquid at a solvation temperature above room temperature) from an image bearing surface to a substrate, including the steps of: transferring the image from the image bearing surface onto an intermediate transfer member, and heating the image on the intermediate transfer member to a temperature above the solvation temperature, below the melting point of the toner particles and below the boiling point of said carrier liquid prior to transfer of the image to the substrate so as to cause the image to adhere to the substrate.
  • the method includes, in a preferred embodiment of the invention, the step of cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • the image is cooled sufficiently such that the adhesion of the image to the intermediate transfer member is less than the cohesion of the image.
  • the step of transferring the image from the image bearing surface is repeated a plurality of times, each transfer corresponding to an image of a different color.
  • the method preferably includes the step of transferring the heated image from the intermediate transfer member to the substrate, wherein the step of transferring the image from the intermediate transfer member onto the substrate is operative to cool the image to below the solvation temperature.
  • apparatus for transfer of an image from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface, means for transferring an image from the image bearing surface onto the intermediate transfer member, and means for transferring the image from the intermediate transfer member onto a substrate and being operative for heating the intermediate transfer member and the image so as to cause the image to adhere to the substrate and for cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • apparatus for transfer of multiple images from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface, means for transferring multiple images from the image bearing surface onto the intermediate transfer member, and means for transferring the multiple images from the intermediate transfer member onto a substrate and being operative for heating the intermediate transfer member and the image so as to cause the image to adhere to the substrate and for cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • apparatus for transfer of an image from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface, means for transferring an image from the image bearing surface onto the intermediate transfer member, and means for transferring the image from the intermediate transfer member onto a substrate and wherein the intermediate transfer member includes a thin walled cylinder of thickness less than 125 microns.
  • apparatus for transfer of multiple images from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface, means for transferring multiple images from the image bearing surface onto the intermediate transfer member, and means for transferring the multiple images from the intermediate transfer member onto a substrate and wherein the intermediate transfer member includes a thin walled cylinder of thickness less than 125 microns.
  • apparatus for transfer of an image from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface; means for transferring an image from the image bearing surface onto the intermediate transfer member, and means for transferring the image from the intermediate transfer member onto a substrate and wherein the intermediate transfer member includes a relatively heat conductive inner layer and a relatively heat insulative outer layer.
  • apparatus for transfer of multiple images from an image bearing surface onto a substrate including an intermediate transfer member positioned in operative association with the image bearing surface, means for transferring multiple images from the image bearing surface onto the intermediate transfer member, and means for transferring the multiple images from the intermediate transfer member onto a substrate and wherein the intermediate transfer member includes a relatively heat conductive inner layer and a relatively heat insulative outer layer.
  • an intermediate transfer member for transfer of an image from an image bearing surface onto a substrate and including a thin walled cylinder having a thickness less than 125 microns.
  • an intermediate transfer member for transfer of an image from an image bearing surface onto a substrate and including a relatively heat conductive inner layer and a relatively heat insulative outer layer.
  • a method for transfer of an image from an image bearing surface onto a substrate including the steps of positioning an intermediate transfer member in operative association with the image bearing surface, transferring an image from the image bearing surface onto the intermediate transfer member, and transferring the image from the intermediate transfer member onto a substrate and including the steps of heating the intermediate transfer member and the image so as to cause the image to adhere to the substrate and cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • a method for transfer of multiple images from an image bearing surface onto a substrate including the steps of positioning an intermediate transfer member in operative association with the image bearing surface, transferring multiple images from the image bearing surface onto the intermediate transfer member, and transferring the multiple images from the intermediate transfer member onto a substrate including the steps of heating the intermediate transfer member and the image so as to cause the image to adhere to the substrate and cooling the intermediate transfer member sufficiently such that the adhesion of the image thereto is less than the cohesion of the image.
  • Fig. 1 there is shown electrostatographic imaging apparatus in which the present invention may be employed and employing a liquid image forming composition.
  • the imaging apparatus may comprise an electrostatographic printing machine or alternatively any other suitable type of imaging apparatus.
  • systems in which the present invention may be employed include electrophotography, electrography, ionography, xero-printing, gravure-like printing and electrostatic printing.
  • Drum 10 is driven in the direction of arrow 16 such that the photoconductive surface 12 moves past a corona discharge device 18 adapted to charge the photoconductive surface 12.
  • An image to be reproduced is focused by a lens 20 upon the photoconductive surface 12.
  • the areas of the photoconductive surface 12 struck by light conduct the charge, or a portion thereof, to ground, thus forming an electrostatic latent image.
  • Developer liquid containing pigmented particles is circulated from any suitable source into a gap 22 defined between a development electrode 24 and the photoconductive surface 12.
  • the development electrode 24 may be appropriately biased as known to the art, to assist in toning the electrostatic latent image as it passes into contact with the developer liquid.
  • the transfer assembly 50 comprises an intermediate transfer element 52, typically in the form of a cylindrical roller.
  • the intermediate transfer element 52 is preferably an intermediate transfer element of the type illustrated in any of Figs. 4A - 7B.
  • Transfer of the image from the photoconductive surface 12 to the intermediate transfer element 52 may take place in accordance with any suitable technique known in the prior art. Examples of suitable techniques are electrostatic transfer, heat transfer, pressure transfer, electrophoretic transfer and combinations thereof. A preferred transfer method is electrophoretic transfer.
  • the liquid toner image is heated on the intermediate transfer member 52. Heating of the image enhances its cohesiveness and renders it tacky, so as to enhance its adhesion to the substrate 40.
  • toner which is prepared in the following manner: 1000g. Elvax II 5550 resin (DuPont) and 500g. Isopar L were mixed in a Ross double planetary mixer for one hour at 90 degrees C, then for a further hour after addition of 250g. Mogul L carbon black (Cabot) which had been wetted by 500g. Isopar L, and finally for another hour after addition of 2000g. Isopar L preheated to 110 degrees C. Stirring was continued in the absence of heating until the temperature reached 40 degrees C.
  • the image 60 located on the intermediate transfer element 52 is heated, by means which will be described hereinbelow, to a temperature which produces desired tackiness of the image. Then the heated image establishes contact with the substrate 40 as shown in Fig. 2A.
  • a toner of the type described in detail on the preceding page wherein a toner of the type described in detail on the preceding page, a toner of the type described in U.S. Patent 4,794,651, the contents of which are hereby incorporated herein by reference, or any other liquid toner which solvates at a temperature below its melting point is used
  • the image 60 is heated to a temperature below the melting point of the dry resin but above the temperature at which the resin swells or begins to solvate with the carrier liquid and becomes tacky, and below the boiling point of the carrier liquid.
  • a liquid toner which does not solvate at a temperature below the melting point of the pigmented solid particles therein may be employed. In such a case, heating of the image to a temperature as high as the melting point of the pigmented solid particles therein is required.
  • the heat transfer to the image from the element 52 and from the image to the substrate 40 is preferably such that the image is cooled, so as to increase its viscosity, while at least maintaining and preferably increasing its cohesiveness. In this way, complete or nearly complete transfer of the image from the intermediate transfer element 52 to the substrate is realized.
  • Fig. 2C illustrates the complete or nearly complete transfer of the image to the substrate 40.
  • the image 60 and member 52 are initially heated to a temperature T 1 of 105 degrees C, which is below the melting point of the resin but above the solvation temperature. During the "transfer duration" the temperature of the image/paper interface is reduced to a temperature T 2 of 85 degrees C, at which the viscosity is increased over that at the higher temperature.
  • Fig. 3 is an illustration, not necessarily to scale, of the dependence of viscosity of an image on temperature. It is seen that the reduction of temperature from T 1 to T 2 provides a corresponding significant rise in viscosity.
  • the image is initially heated to a temperature at which it solvates, so that it will adhere well to the substrate.
  • the image is then cooled, increasing its viscosity and thus increasing its cohesiveness.
  • the adhesion of the image to the substrate is greater than its adhesion to the release coated intermediate transfer member, and the increased cohesion of the image preserves the integrity of the transferred image, providing substantially complete transfer of the image to the substrate.
  • FIG. 4A - 7B illustrate four alternative embodiments of intermediate transfer elements constructed and operative in accordance with a preferred embodiment of the invention.
  • the intermediate transfer element comprises a thin-walled roller 70.
  • Roller 70 preferably is formed of two rigid end portions 72 and 74 and a thin cylindrical layer 76 typically coated with a release layer 78.
  • Typical materials and thicknesses are as follows: Layer 76: metalized polyester Thickness: 25 microns
  • Release layer 78 Teflon (DuPont) Thickness: 5 microns
  • the layer 76 may be a 5 micron thick film of nickel alloy, such as a nickel cobalt or nickel chromium alloy and the release layer may be a 2 micron thick layer of Teflon.
  • Kapton polyimide film may be employed instead of polyester.
  • the release layer may be a thin layer of silicone rubber.
  • the thin cylindrical layer 76 is axially tensioned, as by a spring arrangement 80, sufficient to eliminate most surface irregularities.
  • a suitable tension is 10 Kg.
  • enhanced rigidity and surface uniformity of the thin-walled cylinder 70 is provided by pneumatically pressurizing the interior of the cylinder, by any suitable pressurized gas.
  • a valve 82 may be provided for this purpose.
  • the thin-walled cylinder 70 is heated by the passage of electrical current along layer 76 via conductors 84 and 86, which establish an electrical circuit via end portions 72 and 74.
  • layer 76 must either be or include a layer which is an electrical conductor of suitable characteristics.
  • the electrical power required to provide desired heating of the intermediate transfer element 70 is relatively low.
  • a heating lamp 90 is disposed interior of a radiation transmissive tube 92, such as a quartz tube. Disposed in generally coaxial surrounding relationship with quartz tube 92 and supported on annular end supports 94 is an intermediate transfer layer 96 having formed thereon a release layer 98.
  • layers 96 and 98 may be identical to layers 76 and 78 in the embodiment of Figs. 4A and 4B.
  • tensioning apparatus of the type illustrated in Fig. 4A may be employed.
  • layers 96 and 98 which are more massive and thus more rigid than layers 76 and 78 may be employed.
  • the release layer 98 is provided with sufficient thermal insulation capacity to limit the amount of thermal conduction therethrough so that during transfer of the image to the substrate 40, the image may be cooled as described above in connection with the thin-walled intermediate transfer element.
  • Suitable materials and thicknesses for the non-thin-walled intermediate transfer element are as follows: Layer 96: Aluminum Thickness: 5 mm
  • Layer 98 Silicone rubber Thickness: 2 mm
  • the roller 100 may be either of the thin-walled type or of the non-thin-walled type described above. Heating of the roller 100 is provided externally of the roller by a heating station 102.
  • the heating station 102 employs radiant heaters, which heat the roller by radiation. Alternatively the heating station 102 may heat the roller 100 by conduction through direct contact with the roller.
  • a roller 110 may be either thin- walled or non-thin-walled. Heating of the roller 110 is provided by an internal radiant heater assembly 112 which is mounted internally of roller 110. Radiant heater 112 comprises an elongate radiative heat source 114 which is associated with a reflector 116, which prevents direct radiation from source 114 from reaching the area at which the image is transferred from the roller 110 to substrate 40 (Fig. 1), thus providing differential heating of roller 110 and permitting cooling of the image during transfer as described hereinabove.
  • a suitable weight 118 may be mounted onto the reflector 116 so that when the reflector 116 and weight 118 are pivotably mounted with respect to the roller, they will retain the orientation illustrated, notwithstanding rotation of the roller 110.
  • an intermediate transfer member including a thin surface which supports the image during transfer, the thin surface having an effective heat capacity per unit area which is less than that of the substrate.
  • the thin surface may be a cylindrical surface or alternatively an endless belt or any other configuration. Normally, due to its thinness, the thermal conductivity along the surface is sufficiently small such that the thermal mass of the supports, such as end rollers for a cylindrical surface like that shown in the drawings, may be disregarded.
  • the effective thermal mass of the intermediate transfer element is relatively small. This may be achieved either by the use of a thin-walled roller as described hereinabove, whose inherent thermal mass is limited, or alternatively by the use of a roller, other than a thin-walled roller, but having an outer layer which is a sufficiently good thermal insulator such that the heat transfer characteristics thereof are as required. Such a structure has been described above.
  • Fig. 8 illustrates a variation of the apparatus of Figs. 7A and 7B, using identical reference numerals where appropriate, wherein a reflector is oriented so as to prevent direct radiation heating of the roller from the transfer stage through the photoconductor contact stage.
  • the approximate roller temperature at various locations therealong is as shown in Fig. 9.
  • the intermediate transfer member gives up a measured quantity of heat to the substrate during image transfer thereto (between locations B and C) and remains at a relatively low temperature, i.e. below about 85 degrees centigrade, until it contacts the photoconductive surface 12, at which point it gives up further heat very quickly to the photoconductive surface 12 (between locations D and E).
  • the photoconductive surface does not heat up appreciably in view of its relatively large thermal mass.
  • the intermediate transfer member remains at generally the same temperature until it is exposed to radiation heating (at location 0) and is heated gradually until it reaches a steady state temperature (at location A) just before transfer contact with the substrate (at location B).
  • This development takes place at a first temperature T1; transfer of the image to the intermediate transfer member takes place at an image temperature T2, higher than T1 and final transfer from the intermediate transfer member to the substrate takes place at a temperature T3 higher than temperature T2.
  • the temperature of the intermediate transfer member when it is in propinquity to the photoconductive surface 12 is sufficiently low as to preclude damage to the photoconductive surface 12, even during prolonged contact or propinquity, as when neither of the surfaces is rotating. Accordingly prior art mechanisms for separating the intermediate transfer member from the photoconductive surface 12 when the apparatus is not in operation are not required.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)
  • Wet Developing In Electrophotography (AREA)
EP95201534A 1988-10-04 1989-10-03 Méthode et appareil de formation d'images utilisant un élément de transfert intermédiaire. Withdrawn EP0672967A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8823256 1988-10-04
GB8823256A GB8823256D0 (en) 1988-10-04 1988-10-04 Imaging apparatus
EP90900375A EP0437546B1 (fr) 1988-10-04 1989-10-03 Procede et appareil d'imagerie au moyen d'un element de transfert intermediaire

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP90900375.8 Division 1989-10-03

Publications (2)

Publication Number Publication Date
EP0672967A2 true EP0672967A2 (fr) 1995-09-20
EP0672967A3 EP0672967A3 (fr) 1995-11-22

Family

ID=10644680

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95201534A Withdrawn EP0672967A3 (fr) 1988-10-04 1989-10-03 Méthode et appareil de formation d'images utilisant un élément de transfert intermédiaire.
EP90900375A Expired - Lifetime EP0437546B1 (fr) 1988-10-04 1989-10-03 Procede et appareil d'imagerie au moyen d'un element de transfert intermediaire

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90900375A Expired - Lifetime EP0437546B1 (fr) 1988-10-04 1989-10-03 Procede et appareil d'imagerie au moyen d'un element de transfert intermediaire

Country Status (5)

Country Link
EP (2) EP0672967A3 (fr)
JP (1) JP2883733B2 (fr)
DE (1) DE68926572T2 (fr)
GB (1) GB8823256D0 (fr)
WO (1) WO1990004216A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001002910A1 (fr) * 1999-07-05 2001-01-11 Indigo N.V. Imprimantes et copieurs effectuant le prechauffage du substrat avant le transfert
EP1079281A3 (fr) * 1999-08-23 2001-09-19 Kabushiki Kaisha Toshiba Méthode et appareil de formation d'images
US6861193B1 (en) 2000-05-17 2005-03-01 Hewlett-Packard Indigo B.V. Fluorescent liquid toner and method of printing using same

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636349A (en) * 1988-09-08 1997-06-03 Indigo N.V. Method and apparatus for imaging using an intermediate transfer member
CA2075948C (fr) * 1989-01-04 2001-07-03 Ishaiau Lior Systeme d'imagerie a element de transfert intermediaire
WO1992010793A1 (fr) * 1989-01-04 1992-06-25 Spectrum Sciences B.V. Systeme d'imagerie a element intermediaire de transfert
WO1992017825A1 (fr) * 1989-01-04 1992-10-15 Spectrum Sciences B.V. Systeme d'imagerie muni d'elements de transfert intermediaires
US5592269A (en) * 1993-03-26 1997-01-07 Indigo N.V. Imaging system having an intermediate transfer member
US5815783A (en) * 1989-12-06 1998-09-29 Indigo N.V. Method and apparatus for printing on both sides of a substrate
EP0753797B1 (fr) * 1990-12-13 2001-02-28 Indigo N.V. Methode de formation d'images à élément de transfert intermédiaire
EP0577597B1 (fr) * 1991-03-26 1996-05-15 Indigo N.V. Systeme d'imagerie muni d'elements de transfert intermediaires
US6623902B1 (en) 1991-03-28 2003-09-23 Hewlett-Packard Indigo B.V. Liquid toner and method of printing using same
US6146803A (en) * 1991-03-28 2000-11-14 Indigo N.V. Polymer blend liquid toner compositions
EP0513820A3 (en) * 1991-05-17 1993-05-19 Hewlett-Packard Company Conditioning roller and method of operation for use with a photoconductive drum in an electrophotographic color printer
IL107217A (en) * 1993-10-08 2004-05-12 Hewlett Packard Indigo Bv Development control system
DE69125853T2 (de) * 1991-07-09 1997-11-27 Indigo N.V., Maastricht Entwicklungsgeraet fuer latente bilder
USRE37859E1 (en) 1991-07-09 2002-09-24 Indigo N.V. Development control system
US5289238A (en) * 1991-09-05 1994-02-22 Spectrum Sciences B.V. Liquid toner developing apparatus having metal blade with insulating coating in contact with developing roller
CA2119452C (fr) * 1991-09-20 2002-08-13 Benzion Landa Methode et appareil d'impression directe d'images
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WO1995022086A1 (fr) * 1994-02-08 1995-08-17 Nippon Steel Corporation Appareil de formation d'image polychrome a developpeur liquide
IL112731A0 (en) * 1995-02-21 1995-05-26 Indigo Nv Imaging apparatus with temperature control
WO1996029633A1 (fr) * 1995-03-23 1996-09-26 Indigo N.V. Dispositif de production d'images
US6108513A (en) * 1995-04-03 2000-08-22 Indigo N.V. Double sided imaging
IL113552A (en) * 1995-04-30 2005-09-25 Hewlett Packard Indigo Bv Apparatus and method for centerless printing of images particularly on cylindrical objects
IL114992A0 (en) 1995-08-17 1995-12-08 Indigo Nv Intermediate transfer blanket and method of producing the same
CA2231197A1 (fr) * 1995-09-08 1997-03-13 Indigo N.V. Appareil d'imagerie et dispositif de sortie perfectionne associe
AU2975397A (en) 1997-06-03 1998-12-21 Indigo N.V. Intermediate transfer blanket and method of producing the same
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US6912952B1 (en) 1998-05-24 2005-07-05 Hewlett-Packard Indigo B.V. Duplex printing system
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JP2003534215A (ja) 2000-04-18 2003-11-18 ヒューレット−パッカード・インデイゴ・ビー・ブイ シートの搬送における位置及び詰まりのモニター
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EP0437546B1 (fr) 1996-05-29
GB8823256D0 (en) 1988-11-09
WO1990004216A1 (fr) 1990-04-19
EP0437546A1 (fr) 1991-07-24
EP0672967A3 (fr) 1995-11-22
DE68926572T2 (de) 1996-12-19
JP2883733B2 (ja) 1999-04-19
DE68926572D1 (de) 1996-07-04
JPH04502218A (ja) 1992-04-16

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