EP0779560A2 - Procédé et appareil de développement d'une imgae latente électrostatique - Google Patents

Procédé et appareil de développement d'une imgae latente électrostatique Download PDF

Info

Publication number
EP0779560A2
EP0779560A2 EP96119782A EP96119782A EP0779560A2 EP 0779560 A2 EP0779560 A2 EP 0779560A2 EP 96119782 A EP96119782 A EP 96119782A EP 96119782 A EP96119782 A EP 96119782A EP 0779560 A2 EP0779560 A2 EP 0779560A2
Authority
EP
European Patent Office
Prior art keywords
image areas
intermediate carrier
particles
developing device
voltage
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
EP96119782A
Other languages
German (de)
English (en)
Other versions
EP0779560B1 (fr
EP0779560A3 (fr
Inventor
Anton Rodi
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.)
Eastman Kodak Co
NexPress Digital LLC
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0779560A2 publication Critical patent/EP0779560A2/fr
Publication of EP0779560A3 publication Critical patent/EP0779560A3/fr
Application granted granted Critical
Publication of EP0779560B1 publication Critical patent/EP0779560B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • 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
    • G03G13/06—Developing
    • G03G13/08—Developing using a solid developer, e.g. powder developer
    • 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
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to a method and an apparatus for developing an electrostatic latent image which has been formed on a surface of a movable intermediate carrier by means of electrically charged dielectric paint particles which are transported through a gap between the surface of the intermediate carrier and a surface of a developing device .
  • Such a method and the corresponding device are e.g. B. known from xerography and are used for development in laser printers, copiers, etc.
  • a photoconductor drum is electrically charged and exposed, thereby creating a latent charge pattern on the photoconductor drum that corresponds to the print density distribution of the image to be printed or copied.
  • the latent charge image is then developed by supplying toner to the photoconductor drum which is attracted to and adheres to charged image areas on the photoconductor drum.
  • the photoconductor drum forms an intermediate carrier for the developed toner image, which is then transferred to and fixed on a substrate such as paper.
  • the toner is supplied to the intermediate carrier from a developing device which, for. B. is a cylinder or a belt that runs past the intermediate carrier at a more or less small distance.
  • a developing device which, for. B. is a cylinder or a belt that runs past the intermediate carrier at a more or less small distance.
  • the toner consists of dielectric pigmented particles with a diameter between 5 and 20 microns.
  • the developing device is a belt which rotates around several cylinders and which passes through the intermediate carrier, a photoconductor drum, at a distance which is many times larger than the diameter of the toner particles.
  • the toner particles adhered to the belt by frictional electricity bounce under the action of an electric field across the gap between the belt and the photoconductor drum, leaving non-electrically charged areas of the electrostatic charge pattern colorless.
  • the electric field on the side of the tape comes from an electrode with a pointed edge around which the tape is guided.
  • the change in direction as the ribbon passes the edge also increases the distance between adjacent toner particles of the color layer in the gap and reduces the cohesive forces between the toner particles so that less force is required to remove the individual toner particles from the layer.
  • the voltage differences between image areas and non-image areas of the electrostatic charge pattern be relatively high in order to obtain a sufficiently high-contrast toner image. This is not a problem if the charge pattern is formed by exposing a photoconductor that has been uniformly charged in advance to a few hundred or a thousand volts, e.g. B. in a photocopier or a laser printer.
  • the invention has for its object to provide a development technique that enables sufficient and high-contrast transfer of printing ink to an intermediate carrier, which has an electrostatic latent image with relatively small voltage differences between the different image areas.
  • the ink particles are transported through the gap between the surface of the intermediate carrier and a surface of a developing device so that they more or less fill the gap, but no pressure is exerted on the ink particles.
  • the invention can thus be understood as an intermediate model between “jumper development”, in which there is essentially empty space in the gap, and “contact development”, in which the colored particles are pressed against the intermediate carrier.
  • the invention provides a development technique which manages with relatively small voltage differences in the electrostatic latent image on the intermediate carrier, e.g. B. about 40 volts. Such voltages can be generated in a simple, reliable and inexpensive manner by means of conventional electronics.
  • the invention enables a latent electrostatic image with this property to be developed into a color image which enables adequate color coverage in image areas and which has no background coloration in non-image areas.
  • the latter problem the uncontrolled transfer of color particles to areas that are supposed to remain color-free, is particularly detrimental to conventional "contact development” techniques.
  • the intensity of the color coverage can be controlled excellently, so that a very fine and faithful reproduction of gray levels is possible.
  • an electric field is generated in the gap, which changes in a certain way along the transport path of the color particles.
  • a tension on the surface of the developing device along the transport path is changed, or the stresses on the surface of the intermediate carrier are changed together along the transport path.
  • the color particles transported in the gap are negatively charged, e.g. B. by friction electricity.
  • voltages and charges are understood to mean positive voltages or charges unless otherwise stated.
  • the image areas on the intermediate carrier are under a certain (positive) tension, depending on the desired later gray level at this point, in order to attract the negatively charged color particles thereon.
  • the paint particles were charged positively, the voltages mentioned would be negative.
  • a voltage of zero volts is chosen as the reference voltage, which generally corresponds to the earth potential. In a practical embodiment, this reference voltage can be shifted positively or negatively to the earth potential, the remaining voltages being changed accordingly while maintaining all voltage differences.
  • the voltages are adjusted so that the colored particles pass a substantially field-free area in which they can be distributed over the entire gap width.
  • the only field from which a noteworthy effect originates in this area is the field which originates from charge islands on the surface of the intermediate carrier, ie from the image areas of the electrostatic charge image. These charge islands have a charge that is opposite to the charge of the color particles, so that some of the paint particles are attracted to it. The remaining color particles can remain in the loosely distributed state or adhere to the surfaces of the intermediate carrier or the developing device by means of local forces, provided they come close to them.
  • this voltage is next increased from zero or a value around zero to a value of a few 100 volts.
  • This voltage can be chosen so high that there is just no breakdown between the developing device and the intermediate carrier. This creates a field in which the color particles in the non-image areas detach from the surface of the intermediate carrier, but partially adhere to them in the loaded image areas. In order for all of the color particles to lift off the surface of the intermediate carrier in the non-image regions, the close-acting forces to which color particles are exposed, which have adhered to the surface of the intermediate carrier in the preceding, essentially field-free region, must be overcome.
  • the Van der Waals forces on a particle that is in the vicinity of a surface is referred to below as the adhesive force.
  • Imaging power is the force on a charged particle in the vicinity of a conductive surface, which corresponds to the attraction of an oppositely charged particle, which can be imagined as a mirror image on the other side of this surface.
  • the image power is inversely proportional to the square of the distance of the particle center from the surface and becomes negligible in the technique described herein small if this distance is greater than the range of the adhesive forces. Therefore, the adhesive forces and the image forces are collectively referred to herein as proximity forces, with a range in the range of a few tens of nanometers.
  • the color particles which are opposite to the non-image areas are located at some distance from it. This is because the force which drives the color particles in the electric field of the gap towards the surface of the developing device increases suddenly as soon as the proximity forces are no longer effective. In the image areas, the number of particles that are more likely to be attracted to the image areas is reduced in favor of the number of particles that are more likely to be attracted to the surface of the developing device.
  • the tension on the surface of the Developing device again reduced, at most so much that the color particles are still a few tens of nanometers from the surface of the intermediate carrier in the non-image areas, so that the near-acting forces on this surface can just not be effective again. This prevents individual color particles from spontaneously switching to the non-image areas, and there is no background coloring in non-image areas.
  • the level of cleavage of the color layer in the image areas of the intermediate carrier shifts in favor of color particles that are transferred to the image areas. Therefore, even with slight voltage differences between the image areas and the non-image areas on the intermediate carrier, a high-contrast color transfer is possible, as is required for printing in offset quality.
  • the force on the color particles that adjoin the intermediate supports in the non-image areas has a hysteresis property as a combination of the close-acting forces and the force of the electric field in the gap. This makes use of the invention in order to provide for a given color coverage with lower voltage differences in the electrostatic latent image without having to accept any deterioration in the background of the developed image.
  • grayscale results when using color particles with an average diameter of between a few ⁇ m and 20 ⁇ m and a gap width between approx. 10 and 200 ⁇ m, the width of the gap being a multiple of the average diameter of the color particles. But it is also possible to make the gap only slightly larger than the diameter of the paint particles, z. B. only one layer of color particles is transported into the gap. Grayscale can still be reproduced under partly because the color particles are not strictly organized in practice and have different sizes. Therefore, the cleavage plane is not to be seen as a sharp boundary, but rather as an area in which there are different probabilities according to a Gaussian distribution that a single color particle is drawn in one direction or the other. According to the invention, very low gray levels can be achieved more easily and uniformly than in the conventional "jumper development", since the threshold voltage is significantly lower.
  • an alternating voltage of a few kHz can be superimposed on the third voltage.
  • the amplitude of the superimposed alternating voltage can be up to 200 volts, so that the third voltage is an alternating voltage with peak values between 0 and 200 volts and an effective voltage of 100 volts.
  • a rotating cylinder or a belt running around a cylinder can be used as the intermediate carrier.
  • the surface of the intermediate carrier has a multiplicity of mutually insulated microcells which are individually charged outside the region of the gap.
  • the surface of the intermediate carrier can also be a homogeneous dielectric layer on which charge islands have been generated in accordance with the desired print image.
  • the developing device can have a fixed plate, a fixed or rotating cylinder or a belt rotating around a cylinder.
  • There are various options for transporting the color particles into the gap For example, it is conceivable that the color particles through Gravity slip into the gap. Or one of the many other transport techniques that are known from development technology is used.
  • the color particles can adhere electrostatically to the intermediate carrier before the voltage on the intermediate carrier is brought to zero in the first region of the gap. Magnetic one-component developers can also be considered.
  • the surface curvature which has an effect on the field strength, may have to be taken into account when dimensioning the stresses in the gap. You get a better overview of the conditions in the gap and, above all, a longer distance on which the color particles in the different areas in the gap can be realigned if a belt is used for the intermediate carrier and / or the developing device, with the belt over the length of the gap runs parallel and synchronously with the opposite cylinder or belt.
  • its surface can have a multiplicity of conductive elements which run transversely to the transport path of the color particles, with adjacent conductive elements being more or less insulated from one another.
  • the conductive elements can be supplied with the voltages just required via sliding contacts, or they are capacitively or inductively coupled to generators which induce the corresponding voltages therein.
  • the conductive elements need not be completely isolated from one another. In the event that the surface of the intermediate carrier between the conductive elements is not is completely insulating, but has a low conductivity, the voltage curve can be even, and there are no abrupt field changes when the conductive elements z. B. reach a sliding contact. Not only macroscopic means such as e.g. B. conductor strips, but also microscopic structures, as they exist in directional materials that conduct better in a preferred direction than transversely to it.
  • Fig. 1 shows a small section on the circumference of a development cylinder 1 and an intermediate carrier 2, which is also a cylinder.
  • the development cylinder 1 and the intermediate carrier 2 are mounted above or below the figure on a printing press and are driven so that they rotate synchronously or with a defined differential speed in the arrow directions shown.
  • a surface 3 of the development cylinder 1 and a surface 4 of the intermediate carrier 2 lie opposite one another, with a gap 5 between them.
  • the development cylinder 1 conveys z. B. four layers of paint particles 6 into the gap 5.
  • the color particles 6 are z. B. negatively charged dielectric particles, the z. B. stick by electrostatic attraction in several layers on the surface 3 of the developing cylinder 1.
  • the color particles 6 are shown in a regular arrangement only for simplification and clarity of the drawing; in practice they are more or less statistically distributed.
  • the paint particles 6 are exaggerated in size compared to the size of the cylinder.
  • the gap 5 is so wide at its narrowest point between the development cylinder 1 and the intermediate carrier 2 that the ink particles 6 conveyed therein fill most of the gap 5 without being pressed together.
  • the development cylinder 1 On the surface 3 of the development cylinder 1 there are a plurality of straight conductor strips 8, each of which extends perpendicular to the plane of the figure across the entire length of the development cylinder 1.
  • the conductor strips 8 are arranged distributed over the entire circumference of the development cylinder 1 and are insulated from one another.
  • the surface 4 of the intermediate carrier 2 has a multiplicity of conductive, mutually insulated microcells (not shown in FIG. 1), as described in US Pat. No. 4,792,860 mentioned above. These microcells, their size is chosen in accordance with the desired print resolution, selectively more or less heavily loaded at a point on the circumference of the intermediate carrier 2 that is not visible in the drawing.
  • the surface 4 of the intermediate carrier 2 thus carries an electrostatic charge pattern that corresponds to the desired print image. In the gap 5, color particles 6 are selectively transferred to this charge pattern, so that behind the gap 5 there are color islands 7 of color particles 6 on the surface 4 of the intermediate carrier 2, which correspond to the colored areas of the image to be printed. This developed image is then transferred to another location on the circumference of the intermediate carrier 2 on paper and fixed thereon.
  • FIGS. 2a to 2c show the three areas in the gap 5 along the transport path of the color particles 6, in which the stresses on the surface 3 of the intermediate carrier 1 U 0 , U max or U E can be created.
  • U is 1min z. B. equals zero and U 1 is greater than U 1min , z. B. equal to 40 volts.
  • the microcell 9a forms an image area in which maximum color saturation is desired, and the microcell 9b forms a non-image area to which no color is to be transferred.
  • the voltage U 0 on the surface 3 of the developing cylinder 1 is zero or approximately zero, so that the ink particles 6 in the gap 5 are not subjected to any general force. However, a part of the color particles 6 is attracted to the charged microcell 9a, and some colored particles adhere to the microcell 9b and to the surface 3 of the development cylinder 1 solely by means of local forces.
  • the voltage on the surface 3 of the development cylinder 1 is a positive voltage U max , which, at a few hundred volts, is substantially greater than the voltage U 1 of the microcell 9a and which generally attracts the colored particles 6 to the surface 3 of the development cylinder 1 .
  • the voltage U max is selected so that the color particles 6 are completely separated from the microcell 9b, even if they have stuck to them in the meantime. The proximity forces on color particles 6, which adhere to the microcell 9b, must therefore be overcome. A portion of the colored particles 6 which have been attracted by the microcell 9a in FIG. 2a is drawn towards the surface 3 of the development cylinder 1 in FIG.
  • the voltage U max is lowered to a voltage U E that is less than U max and greater than / equal to U 1 .
  • the voltage U E is selected so that the color particles 6 immediately above the microcell 9b do not just touch it, more precisely that the near-acting forces from the microcell 9b are not yet able to draw color particles 6 to the microcell 9b.
  • more paint particles 6 are again attracted to the microcell 9a, in FIG. 2c two layers of paint particles.
  • the thickness of the transferred ink layer is substantially greater than the thickness of the ink layer which is held by the microcell 9a in the phase shown in FIG. 2b.
  • the cleavage plane in the color layer shifts in favor of transferred color particles in the image areas, but not in favor of transferring color particles in the non-image areas. Therefore, by lowering the voltage on the surface 3 of the development cylinder 1, very small voltage differences between the microcells 9a, 9b that can be generated by conventional electronics are used in order to achieve color saturation in image areas and a color-free background in non-image areas.
  • the last voltage U E also ensures that the non-transferred ink particles 6 adhere to the surface 3 of the development cylinder 1 and are transported out of the gap.
  • the voltage U E can be maintained or refreshed during the further rotation of the development cylinder 1, so that the surface 3 can take up new ink particles 6 and transport them again from the left into the gap 5, as shown in FIG. 1.
  • the voltage on the opposite side can alternatively also be changed.
  • the voltages U 1 and U 1min are changed together while maintaining the voltage intervals between them.
EP96119782A 1995-12-12 1996-12-10 Procédé et appareil de développement d'une imgae latente électrostatique Expired - Lifetime EP0779560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19546248 1995-12-12
DE19546248A DE19546248A1 (de) 1995-12-12 1995-12-12 Verfahren und Vorrichtung zum Entwickeln eines elektrostatischen latenten Bildes

Publications (3)

Publication Number Publication Date
EP0779560A2 true EP0779560A2 (fr) 1997-06-18
EP0779560A3 EP0779560A3 (fr) 2000-10-04
EP0779560B1 EP0779560B1 (fr) 2002-08-14

Family

ID=7779830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119782A Expired - Lifetime EP0779560B1 (fr) 1995-12-12 1996-12-10 Procédé et appareil de développement d'une imgae latente électrostatique

Country Status (6)

Country Link
US (1) US5737004A (fr)
EP (1) EP0779560B1 (fr)
JP (1) JPH09179401A (fr)
KR (1) KR100236262B1 (fr)
CN (1) CN1158437A (fr)
DE (2) DE19546248A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09307710A (ja) * 1996-05-10 1997-11-28 Brother Ind Ltd 画像読取記録装置
US7433637B2 (en) * 2004-04-08 2008-10-07 Kabsushiki Kaisha Toshiba Image forming apparatus and method of manufacturing electronic circuit using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997688A (en) 1974-05-31 1976-12-14 Xerox Corporation Developing an electrical image
US4792860A (en) 1987-02-27 1988-12-20 Kuehrle Manfred R Thermodynamic printing method and means

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3550556A (en) * 1968-01-11 1970-12-29 Xerox Corp Development apparatus
JPS4837611B1 (fr) * 1969-07-03 1973-11-12
US3719169A (en) * 1971-05-07 1973-03-06 Xerox Corp Plural electrode development apparatus
GB1458766A (en) * 1973-02-15 1976-12-15 Xerox Corp Xerographic developing apparatus
CA1138723A (fr) * 1978-07-28 1983-01-04 Tsutomu Toyono Methode et appreil de developpement pour transfert de revelateur par polarisation electrique
US4473627A (en) * 1978-07-28 1984-09-25 Canon Kabushiki Kaisha Developing method for developer transfer under electrical bias and apparatus therefor
US4777500A (en) * 1986-03-31 1988-10-11 Salmon Peter C Electrostatic color printer
JP3020641B2 (ja) * 1991-04-01 2000-03-15 株式会社リコー 現像装置
US5314774A (en) * 1992-05-22 1994-05-24 Hewlett-Packard Company Method and apparatus for developing color images using dry toners and an intermediate transfer member
JP2962088B2 (ja) * 1993-03-05 1999-10-12 株式会社日立製作所 カラープリンタ
US5552817A (en) * 1993-12-13 1996-09-03 Kuehnle; Manfred R. Electrothermal printing ink with monodispersed synthetic pigment particles and method and apparatus for electronic printing therewith
EP0661607B1 (fr) * 1993-12-29 2000-08-02 Canon Kabushiki Kaisha Appareil de développement utilisant une impulsion de polarisation empêchant la formation d'un voile
US5889867A (en) * 1996-09-18 1999-03-30 Bauck; Jerald L. Stereophonic Reformatter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997688A (en) 1974-05-31 1976-12-14 Xerox Corporation Developing an electrical image
US4792860A (en) 1987-02-27 1988-12-20 Kuehrle Manfred R Thermodynamic printing method and means

Also Published As

Publication number Publication date
EP0779560B1 (fr) 2002-08-14
DE19546248A1 (de) 1997-06-19
DE59609560D1 (de) 2002-09-19
KR100236262B1 (ko) 1999-12-15
EP0779560A3 (fr) 2000-10-04
US5737004A (en) 1998-04-07
JPH09179401A (ja) 1997-07-11
KR970049100A (ko) 1997-07-29
CN1158437A (zh) 1997-09-03

Similar Documents

Publication Publication Date Title
DE3411948C2 (fr)
DE2419595A1 (de) Elektrographisches aufzeichnungsverfahren und aufzeichnungseinrichtung
DE3205829A1 (de) Elektrostatische druckvorrichtung
DE19710693B4 (de) Bildaufzeichnungsverfahren und Bildaufzeichnungseinrichtung
DE2407380A1 (de) Vorrichtung und verfahren zum entwickeln latenter elektrostatischer bilder
DE2257150A1 (de) Verfahren und vorrichtung zum schlaglosen drucken mit fluessiger farbe
DE1497087A1 (de) Verfahren des elektrostatischen Druckens
DE60108027T2 (de) Bilderzeugungsvorrichtung
EP0786705A1 (fr) Procédé d'impression électrostatique et dispositif avec une tête d'impression contenant des brosses
DE60107913T2 (de) Bilderzeugungsgerät
DE3119027A1 (de) Elektrofotographisches verfahren und einrichtungen zur durchfuehrung des verfahrens
EP0713155B1 (fr) Dispositif d'impression
DE2755489C2 (de) Elektrostatisches Druckverfahren
EP1882211A1 (fr) Dispositif et procede pour imprimer un support d'enregistrement des deux cotes, avec un dispositif de changement de charge et un dispositif d'application de nouvelle charge
WO2005111735A2 (fr) Procede et dispositif pour encrer un element applicateur d'imprimante ou de photocopieuse electrophotographique
EP0779560B1 (fr) Procédé et appareil de développement d'une imgae latente électrostatique
DE2600605C3 (de) Elektrostatischer Strichcode-Drucker
DE2731636C3 (de) Elektrografisches Aufzeichnungsgerät
DE3234893C2 (fr)
DE2403143A1 (de) Kopiergeraet und verfahren zum bewirken unterschiedlicher stufen in der grauskalenwiedergabe
DE3010981C3 (de) Verfahren und Vorrichtung zur Herstellung eines Tonerbildes auf der Oberfläche eines dielektrischen Aufzeichnungselementes
DE2733878A1 (de) Elektropulskopiervorrichtung
DE19637613C2 (de) Druckmaschine zum Erzeugen eines Bildes mittels Tonpartikeln
DE19501477A1 (de) Bilderzeugungsvorrichtung mit einer Einrichtung zum Entfernen von Toner
EP0052789A2 (fr) Procédé de transfert d'un dessin de pigment

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19961210

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB NL

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 20020207

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB NL

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 59609560

Country of ref document: DE

Date of ref document: 20020919

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20021028

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20021125

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20021217

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030221

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030228

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20030515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031210

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20031210

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20041025

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20041130

Year of fee payment: 9

NLS Nl: assignments of ep-patents

Owner name: HEIDELBERG DIGITAL L.L.C.

Owner name: EASTMAN KODAK COMPANY

NLT1 Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1

Owner name: NEXPRESS DIGITAL LLC

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060701

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20060701