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EP0147341A2 - Verfahren zur elektrophotographischen Reproduktion, mit umgekehrter Entwicklung, auf einem leitenden Bildträger mit Verwendung eines magnetischen Einkomponentigen Entwicklungspulvers und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur elektrophotographischen Reproduktion, mit umgekehrter Entwicklung, auf einem leitenden Bildträger mit Verwendung eines magnetischen Einkomponentigen Entwicklungspulvers und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0147341A2
EP0147341A2 EP84420207A EP84420207A EP0147341A2 EP 0147341 A2 EP0147341 A2 EP 0147341A2 EP 84420207 A EP84420207 A EP 84420207A EP 84420207 A EP84420207 A EP 84420207A EP 0147341 A2 EP0147341 A2 EP 0147341A2
Authority
EP
European Patent Office
Prior art keywords
photoconductive surface
conductive support
image
powder
magnetic
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Withdrawn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
EP84420207A
Other languages
English (en)
French (fr)
Other versions
EP0147341A3 (de
Inventor
Kim Pham Quang
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.)
Rhone Poulenc Systemes SA
Original Assignee
Rhone Poulenc Systemes SA
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 Rhone Poulenc Systemes SA filed Critical Rhone Poulenc Systemes SA
Publication of EP0147341A2 publication Critical patent/EP0147341A2/de
Publication of EP0147341A3 publication Critical patent/EP0147341A3/de
Withdrawn legal-status Critical Current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
    • G03G15/161—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
    • 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

Definitions

  • the present invention relates to an electrophotographic reproduction process, with reverse development, on a conductive support, using a single-component magnetic development powder. It also relates to an electrophotographic reproduction device, with reverse development, on a conductive support, using a single-component magnetic development powder.
  • the subject of the invention is an improvement of the method and the device according to the French patent application registered under the number 80/10 611, published under the number 2 482 323.
  • An object of the invention is a method of photographic electr q reproduction, with reverse development, and a device for its implementation, on a conductive support, using a single-component magnetic development powder which make it possible to obtain an image of very good quality which does not present, in particular, lighter areas in the dark areas, which is well defined and is presented on a clean background.
  • the conductive support is connected to the terminal of the same sign as that of the charge of the photoconductive surface of at least one voltage generator.
  • the photoconductive surface, the magnetic means and the conductive support are connected to the terminal of the same sign as that of the charge of the photoconductive surface of the same tensor generator.
  • the electrophotographic reproduction method according to the invention is such that a voltage is applied to the magnetic means at least equal to the voltage applied to the photoconductive surface.
  • a voltage greater than the voltage applied to the photoconductive surface is applied to the magnetic means.
  • the conductive support is connected to the terminal of the same sign as that of the charge of the photoconductive surface of at least one voltage generator by means consisting of conductive wires and d resistant elements.
  • the conductive support is connected to the terminal of sign different from that of the charge of the photoconductive surface of at least one voltage generator via the ground.
  • the photoconductive surfaces generally used in electrophotographic reproduction can be used.
  • the photoconductive surface can be made of selenium, of an alloy containing selenium, of cadmium sulphide, of zinc oxide or even be made of an organic photoconductive material, such as polyvinylcarbazole or a derivative of oxadiazole.
  • a photoconductive surface of selenium or selenium alloy is positively charged, while a photoconductive surface of cadmium sulfide or zinc oxide is negatively charged, most organic photoconductive materials also charge negatively.
  • photoconductive surface does not presume the geometric shape thereof.
  • the photoconductor surface may for example be in the form of a flexible strip, without 'end or not, or more often in the form of a cylindrical surface generally circular guideline.
  • magnetic means By “magnetic means” is meant, in the present text, both means which convey the single-component magnetic developing powder in the vicinity of the photoconductive surface and means which allow the development of the charge image to form an image of powder.
  • the magnetic means are such that part of their outer surface is in contact with the magnetic developing powder contained in a container, in order to take it up and their outer surface, once carrying magnetic developing powder, comes to the in the vicinity of the photoconductive surface provided with the charge image so that the magnetic developing powder is transferred to the photoconductive surface to form the powder image.
  • magnetic means it is possible to use, for example, a magnetic brush or a strip, for example of magnetic rubber or formed of a textile tape or of a film coated with a magnetic coating, such a strip also being conductive.
  • a magnetic brush composed of a metal cylinder, called a sheath, is used in which magnets are rotated, the magnetic brush thus retains on the surface of the sheath the one-component magnetic development powder.
  • one-component magnetic development powder is meant a development powder in which only one type of magnetic particles is present, coated with a suitable resin and having a volume resistivity less than or at most equal to 10 15 ⁇ cm 2 / cm, as well as mixtures of developing powders, as defined above, of different resistivities and particle sizes.
  • the magnetic developing powder can be made up of particles of metallic oxide, for example of iron oxide, coated with resin which can comprise particular adjuvants in order to improve the fluidity of the magnetic developing powder or the fixing properties. or to modify the charge taken by the particles.
  • the means for transferring the powder image to the conductive support are of a well known type. They can implement the action of an electric field or the corona effect or even combine the action of an electric field and the pressure between the photoconductive surface and the conductive support.
  • conductive support is meant in the present text a support whose surface resistivity is less than 10 13 ⁇ cm 2 / cm.
  • the "conductive support” can be conductive in the mass, it can also be conductive only in the vicinity of the surface onto which the powder image is transferred, thus it is not going beyond the ambit of the invention by putting in place works a conductive support formed of a conductive support as defined above associated with a base, for example non-conductive.
  • the conductive supports which can be used in the present invention can be of any kind.
  • low resistivity supports such as metallic supports are very suitable. It is thus possible, depending on the type of conductive support used, to produce for example directly lithographic printing plates using an encrophilic magnetic development powder and a conductive support made of treated polyester, metal, coated paper Vietnamese or even directly " transparent "projectable using as a conductive support a transparent polyester film, coated with a conductive layer.
  • conductive support does not presume the geometric shape thereof.
  • the conductive support may, for example, be in the form of a flexible strip, endless or not, of rigid, semi-rigid or flexible plate, of sheet, or else be in the form of a cylindrical surface generally of circular director.
  • the means for wetting the conductive support are of a type usually used, it is possible in particular to use coating means.
  • a movable conductive support one can use fixed coating means such as, for example, a brush or a pad.
  • the coating means are constituted by a rotating coating roller device.
  • volatile dielectric liquid with a volume resistivity greater than 10 3 ⁇ cm 2 / cm those which are not too volatile are used so that a thin layer of liquid is effectively present at all points of the conductive support at the time of image transfer. powder but also sufficiently volatile to evaporate quickly.
  • a liquid will be used having a volatility index of between 0.01 and 0.4 according to the standard NFT 30-301 of August 1969.
  • the dielectric liquid used will not be a solvent for the material forming the photoconductive surface so as not to deteriorate it.
  • the dielectric liquid will not be a solvent for the resins used for the production of the magnetic developing powder so as not to cause even a partial softening of the magnetic developing powder which would thus risk being fixed on the conductive support. detrimentally.
  • transferring the powder image from the conductive support to a copy support conventional means can be used, for example it is possible to transfer the powder image from the conductive support to a copy support by pressing.
  • pressure fixing means can be used, the conductive support or the copy support passing between two pressure rollers.
  • Means for transferring the powder image by pressure can of course constitute means for fixing the powder image.
  • fixing means constituted by heating means such as a ramp or an infrared oven, such fixing means can of course be combined with fixing means by pressure.
  • the device comprises means for connecting the photoconductive surface, the magnetic means and the conductive support to the terminal of the same sign as that of the charge of the photoconductive surface of at least one generator. Of voltage.
  • the voltage generator a voltage generator of a type commonly used in electrophotographic reproduction is used.
  • the photoconductive surface, the magnetic means and the conductive support are connected to the positive terminal of at least one voltage generator.
  • the photoconductive surface, the magnetic means and the conductive support are connected to the negative terminal of at least a voltage generator.
  • the device according to the invention is such that it comprises mcyens for connecting the photoconductive surface, the magnetic means and the conductive support to the terminal of the same sign as that of the charge of the photoconductive surface of the same voltage generator.
  • a device comprising a single voltage generator makes it possible to obtain images of powder of excellent quality.
  • the device according to the invention comprises means for applying to the magnetic means a voltage at least equal to the voltage applied to the photoconductive surface.
  • it comprises means for applying to the magnetic means a voltage greater than the voltage applied to the photoconductive surface.
  • the magnetic means of which consist of a magnetic brush is preferably such that the sheath of the magnetic brush is connected to the voltage generator.
  • the embodiment of the electrophotographic reproduction device, with reverse development, object of the invention, described below and represented by the attached figure, is such that the photoconductive surface is a surface cylindrical with circular director, that the magnetic means are a magnetic brush, that the conductive support is in the form of a cylindrical surface, the photoconductive surface, the magnetic brush and the conductive support being placed so that their axes are parallel.
  • the attached figure is a sectional view through a plane perpendicular to the axes.
  • the device for the implementation of the electrophotographic reproduction process, with inverted development, on a conductive support using a single-component magnetic development powder, object of the invention, the device, also object of the invention, can be used. and shown in the attached figure.
  • the magnetic brush (2) is composed of a sheath (22) in which magnets rotate, part of its outer surface, that is to say its sheath (22), is in contact with the developing powder.
  • magnetic (3) the latter being contained in a tray (18).
  • the means for transferring (4) the powder image from the photoconductive surface (1) to the conductive support (5) implement, according to the present embodiment, the action of an electric field combined with the pressure action between the photoconductive surface (1) and the conductive support (5).
  • the means (6) for wetting the conductive support (5) with a volatile dielectric liquid (7) with a volume resistivity greater than 10 3 J6 cm 2 / cm, prior to the transfer of the powder image, are, according to the present mode embodiment, constituted by a coating roller (19) wetted by contact with a porous block (20) partly immersed in the dielectric liquid (7) contained in a reservoir (21).
  • the means for transferring the powder image from the conductive support (5) to the copy support (9) use, according to the embodiment of the invention shown in the figure, the pressure existing between the conductive support (5) and the roller (8).
  • the copy support (9) advances by rotating the conductive support (5) and the roller (8) in opposite directions to each other, the pressure existing between the conductive support (5) and the roller (8 ) simultaneously performs the fixing of the powder image on the copy support (9).
  • the means for respectively connecting the photoconductive surface - this (1) in selenium, the sheath (22) of the magnetic brush (2), and the conductive support (5) to the positive terminal (23) of the voltage generator (13) consist, for example, of conductive son (10, 11, 12).
  • a resistant element R 1 is placed on the conducting wire (10 ) between the photoconductive surface (1) and the positive terminal (23) of the voltage generator (13).
  • a resistant element R 2 is placed on the conductive wire (12) between the conductive support (5) and the photoconductive surface (1), the conductive support (5) being, according to the embodiment shown, connected to the positive terminal (23) of the voltage generator (13) in series with the photoconductive surface (1).
  • a charge image is formed on the photoconductive surface (1) from an original using an appropriate optical system (25).
  • the monocomponent magnetic developing powder (3) contained in the tank (18) is conveyed, in the vicinity of the photoconductive surface (1), by means of the magnetic brush (2), part of the outer surface of the sheath (22) is in contact with the magnetic powder (3), and the charge image is developed inversely to obtain a powder image.
  • the powder image is transferred in (4) from the photoconductive surface (1) to the conductive support (5) under the influence of the electric field existing between the photoconductive surface (1) and the conductive support (5), in the presence of '' a layer of volatile dielectric liquid with a volume resistivity greater than 10 3 ⁇ cm 2 / cm.
  • the conductive support (5) has been coated with dielectric liquid by contact with the coating roller (19) of the means (6) for wetting the conductive support (5).
  • the image obtained is well defined and has no colored background.
  • the method and the device for its implementation, according to the invention make it possible to obtain, with reverse development, on a conductive support, using a single-component magnetic development powder, an image of very good quality.
  • the image obtained does not have a lighter area in the dark areas, it is well defined and moreover is presented on a clean background.
  • the process of electrophotographic reproduction, with reverse development, on a conductive support, using a single-component magnetic development powder, object of the invention does not impose any change in polarity of the charge on the surface.
  • photoconductive, nor of change of developing powder compared to a process with direct development one can also easily obtain with the device, object of the invention, a powder image conforming to the original, that is to say developed directly, by providing suitable electrical means acting only during the development phase of the charge image in order to allow direct development.
  • a selenium photoconductive surface (1) On a selenium photoconductive surface (1), positive charges are uniformly deposited using a corona effect device (14) formed by 2 wires spaced 11 mm apart and located 11 mm apart. of the photoconductive surface (1).
  • the corona effect device. is supplied with a direct voltage of 6,500 volts.
  • the residual surface voltage of the charged photoconductive surface, after 10 seconds, is 1,300 volts (voltage measured with a MONROE model 244 electrometer).
  • Cn performs the insolation of the photoconductive surface (1) from an original consisting of a REGMA frame using an appropriate optical system (25).
  • the light radiation is delivered by a SYLVANIA 600 watt bulb, delivering 400 Lux at the photoconductive surface (1).
  • the enlargement ratio used is 1.
  • the charge image obtained is developed, in an inverted manner, using a negative one-component developer powder for pressure fixing, sold under the trade name HMT 824-3 from the company HITACHI METALS LTD.
  • a magnetic brush (2) with a fixed sheath (22) and rotating magnets was used at the speed of 620 rpm so as to displace the developing powder.
  • the distance between the sheath (22) without developing powder and the photoconductive surface (1) is approximately 0.3 mm, the thickness of developing powder carried by the magnetic brush (2) is approximately 0.2 mm.
  • the conductive support (5) consists of a metallic cylinder of polished appearance, previously coated with a layer of dielectric liquid, constituted by an isoparaffinic hydrocarbon sold under the trade name ISOPAR G by the company ESSO.
  • the image is transferred by pressure, under a pressure of 25 kg / cm between the conductive support (5) and the roller (8), on a copy support (9) consisting of a sheet of plain paper sold under the trade name VELIN 75 RG by Papeteries VOIRON DES GORGES.
  • the sheath (22) of the magnetic brush (2) is polarized by a positive voltage of 1500 volts, the photoconductive surface (1) is subjected to a positive voltage of 700 volts and the conductive support (5) is connected to ground. .
  • a voltage generator (13) is used which supplies a voltage of approximately 1600 volts.
  • the photoconductive surface (1) is connected by the conductive wire (10) to the positive terminal (23) of the voltage generator (13) via a resistive element R 1 of 20 M ⁇ .
  • the voltage applied to the photoconductive surface (1) is approximately 650 volts.
  • the sheath (22) of the magnetic brush (2) is connected directly by the conductive wire (11) to the positive terminal (23) of the voltage generator (13). The sheath (22) of the magnetic brush (2) is then brought to a voltage approximately 1000 volts higher than the voltage to which the photoconductive surface is brought.
  • the conductive support is connected to the positive terminal (23) of the voltage generator (13) via the conductive wire (12) via the 10 M ⁇ resistive element R 2 , in series with the photoconductive surface (1) and the resistive element R 1 .
  • the image obtained on the copy medium (9) is reproduced below, it can be seen that it is of very good quality.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Wet Developing In Electrophotography (AREA)
EP84420207A 1983-12-22 1984-12-11 Verfahren zur elektrophotographischen Reproduktion, mit umgekehrter Entwicklung, auf einem leitenden Bildträger mit Verwendung eines magnetischen Einkomponentigen Entwicklungspulvers und Vorrichtung zur Durchführung des Verfahrens Withdrawn EP0147341A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320799 1983-12-22
FR8320799A FR2557317B1 (fr) 1983-12-22 1983-12-22 Procede de reproduction electrophotographique, avec developpement inverse, sur un support conducteur a l'aide d'une poudre de developpement magnetique monocomposant et dispositif pour la mise en oeuvre du procede

Publications (2)

Publication Number Publication Date
EP0147341A2 true EP0147341A2 (de) 1985-07-03
EP0147341A3 EP0147341A3 (de) 1985-08-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84420207A Withdrawn EP0147341A3 (de) 1983-12-22 1984-12-11 Verfahren zur elektrophotographischen Reproduktion, mit umgekehrter Entwicklung, auf einem leitenden Bildträger mit Verwendung eines magnetischen Einkomponentigen Entwicklungspulvers und Vorrichtung zur Durchführung des Verfahrens

Country Status (5)

Country Link
US (1) US4607940A (de)
EP (1) EP0147341A3 (de)
JP (1) JPS60221773A (de)
DK (1) DK625884A (de)
FR (1) FR2557317B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992010793A1 (en) * 1989-01-04 1992-06-25 Spectrum Sciences B.V. Imaging system with intermediate transfer member
EP0513547A2 (de) * 1991-04-18 1992-11-19 Hitachi, Ltd. Elektrofotografisches Aufzeichnungsgerät
WO1993004409A1 (en) * 1991-08-14 1993-03-04 Indigo N.V. Duplex printer
US5552875A (en) * 1991-08-14 1996-09-03 Indigo N.V. Method and apparatus for forming duplex images on a substrate
US5572274A (en) * 1989-01-04 1996-11-05 Indigo N.V. Liquid developer imaging system and method utilizing an intermediate transfer member
EP0753797A2 (de) * 1990-12-13 1997-01-15 Indigo N.V. Bilderzeugungssystem mit Zwischenübertragungselement
US5636349A (en) * 1988-09-08 1997-06-03 Indigo N.V. Method and apparatus for imaging using 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

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US4804995A (en) * 1985-07-31 1989-02-14 Kabushiki Kaisha Toshiba Charged latent image developing apparatus
US4684238A (en) * 1986-06-09 1987-08-04 Xerox Corporation Intermediate transfer apparatus
US4768060A (en) * 1987-03-05 1988-08-30 Savin Corporation Push-pull liquid development method and apparatus
IL111846A0 (en) * 1994-12-01 1995-03-15 Indigo Nv Imaging apparatus and intermediate transfer blanket therefor
EP0764891B1 (de) * 1991-07-09 2001-07-18 Indigo N.V. Flüssigtonerentwickler-Kartusche
USRE37859E1 (en) 1991-07-09 2002-09-24 Indigo N.V. Development control system
US6912952B1 (en) 1998-05-24 2005-07-05 Hewlett-Packard Indigo B.V. Duplex printing system
DE69836646T2 (de) 1998-05-24 2007-10-11 Hewlett-Packard Indigo B.V. Drucksystem
US6823786B1 (en) 1999-11-07 2004-11-30 Hewlett-Packard Indigo B.V. Tandem printing system with fine paper-position correction
WO2001079096A1 (en) 2000-04-18 2001-10-25 Indigo N.V. Sheet transport position and jam monitor
US6363234B2 (en) 2000-11-21 2002-03-26 Indigo N.V. Printing system
US6594463B2 (en) * 2001-08-23 2003-07-15 Kabushiki Kaisha Toshiba Image forming apparatus and method with intermediate transfer member
US20110318081A1 (en) * 2010-06-28 2011-12-29 Toshiba Tec Kabushiki Kaisha Image forming apparatus and image forming method

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FR1421638A (fr) * 1963-11-19 1965-12-17 Australia Res Lab Perfectionnements apportés aux procédés d'impression électrostatique
FR1575733A (de) * 1967-04-21 1969-07-25
EP0040128A2 (de) * 1980-05-12 1981-11-18 Rhone-Poulenc Systemes Verfahren zur elektrographischen Reproduktion auf einem Träger unter Verwendung eines magnetischen einkomponentigen Entwicklungstoners
US4415254A (en) * 1980-10-03 1983-11-15 Olympus Optical Company Ltd. Electrophotographic copying apparatus with transfer bias voltage stabilizer

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JPS5136072B2 (de) * 1971-12-28 1976-10-06
JPS5280902A (en) * 1975-12-26 1977-07-07 Fuji Xerox Co Ltd Offset printing method employing image recording element
US4056314A (en) * 1976-06-04 1977-11-01 Xerox Corporation Liquid ink imaging system
US4357096A (en) * 1981-03-06 1982-11-02 Eastman Kodak Company Dispersion supply apparatus for photoelectrophoretic migration imaging
JPS58114043A (ja) * 1981-12-28 1983-07-07 Ricoh Co Ltd カラ−記録方法

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Publication number Priority date Publication date Assignee Title
FR1421638A (fr) * 1963-11-19 1965-12-17 Australia Res Lab Perfectionnements apportés aux procédés d'impression électrostatique
FR1575733A (de) * 1967-04-21 1969-07-25
EP0040128A2 (de) * 1980-05-12 1981-11-18 Rhone-Poulenc Systemes Verfahren zur elektrographischen Reproduktion auf einem Träger unter Verwendung eines magnetischen einkomponentigen Entwicklungstoners
US4415254A (en) * 1980-10-03 1983-11-15 Olympus Optical Company Ltd. Electrophotographic copying apparatus with transfer bias voltage stabilizer

Cited By (11)

* 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
WO1992010793A1 (en) * 1989-01-04 1992-06-25 Spectrum Sciences B.V. Imaging system with intermediate transfer member
US5572274A (en) * 1989-01-04 1996-11-05 Indigo N.V. Liquid developer imaging system and method utilizing 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
EP0753797A2 (de) * 1990-12-13 1997-01-15 Indigo N.V. Bilderzeugungssystem mit Zwischenübertragungselement
EP0753797A3 (de) * 1990-12-13 1997-05-07 Indigo Nv Bilderzeugungssystem mit Zwischenübertragungselement
EP0513547A2 (de) * 1991-04-18 1992-11-19 Hitachi, Ltd. Elektrofotografisches Aufzeichnungsgerät
EP0513547A3 (en) * 1991-04-18 1993-04-21 Hitachi, Ltd. Electrophotographic recording apparatus
EP0702278A3 (de) * 1991-04-18 1997-07-23 Hitachi Ltd Elektrofotografisches Aufzeichnungsgerät
WO1993004409A1 (en) * 1991-08-14 1993-03-04 Indigo N.V. Duplex printer
US5552875A (en) * 1991-08-14 1996-09-03 Indigo N.V. Method and apparatus for forming duplex images on a substrate

Also Published As

Publication number Publication date
FR2557317A1 (fr) 1985-06-28
FR2557317B1 (fr) 1986-04-18
DK625884D0 (da) 1984-12-21
US4607940A (en) 1986-08-26
JPS60221773A (ja) 1985-11-06
DK625884A (da) 1985-06-23
EP0147341A3 (de) 1985-08-07

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