EP0490105B1 - Dispositif pour la description selon une image d'une plaque d'impression - Google Patents

Dispositif pour la description selon une image d'une plaque d'impression Download PDF

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Publication number
EP0490105B1
EP0490105B1 EP91119321A EP91119321A EP0490105B1 EP 0490105 B1 EP0490105 B1 EP 0490105B1 EP 91119321 A EP91119321 A EP 91119321A EP 91119321 A EP91119321 A EP 91119321A EP 0490105 B1 EP0490105 B1 EP 0490105B1
Authority
EP
European Patent Office
Prior art keywords
electron beam
printing forme
electron
beam gun
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91119321A
Other languages
German (de)
English (en)
Other versions
EP0490105A1 (fr
Inventor
Alfred Hirt
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.)
Manroland AG
Original Assignee
MAN Roland 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0490105A1 publication Critical patent/EP0490105A1/fr
Application granted granted Critical
Publication of EP0490105B1 publication Critical patent/EP0490105B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1058—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by providing a magnetic pattern, a ferroelectric pattern or a semiconductive pattern, e.g. by electrophotography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/006—Printing plates or foils; Materials therefor made entirely of inorganic materials other than natural stone or metals, e.g. ceramics, carbide materials, ferroelectric materials

Definitions

  • the invention relates to a device for image-wise writing and erasing by polarization or depolarization of a printing form coated with ferroelectric material and an erasing device assigned to the depolarization or repolarization of the printing form.
  • a device of this type is known from DE-OS 36 33 758, in which the printing form is also coated with ferroelectric material and to which a pair of electrodes and a heat source for local polarization or depolarization is assigned and which can be controlled via an information transmission unit.
  • the property is used that differently polarized locations of the ferroelectric material have different affinities for color and water.
  • the pictorial polarization of the printing form takes place through spontaneous flipping of certain areas, the so-called domains, within the material under the effect of an electric field. It is typical of ferroelectrics that this so-called spontaneous polarization takes place from a defined, material-dependent field strength of the so-called coercive field strength.
  • the material After polarization has taken place, the material remains in the previously generated polarized state.
  • This stable state is achieved in that the charges applied to the surface build up an electric field inside the material, in which the ferroelectric domains are aligned during polarization and form a fixed double layer of charge and counter-charge generated by dipoles, which can only be achieved by strong external fields or high temperature can be destroyed, ie the polarization can only be reversed by an electric field of the same size but in the opposite direction or by heating via the so-called Curie point. Only if the spontaneous polarization necessary amount of charge can flow on the surface of the printing form, ie only if the product current x time is sufficiently large, can be polarized.
  • the known device is based on the principle of pin electrodes.
  • the charge is transferred to the surface by touch or via micro-discharge in the gap between the pen electrodes and the surface of the printing form. This results in an abrasive material load or an insufficient amount of charge.
  • the object of the invention is to create a device of the type mentioned at the beginning in which a sufficient amount of charge is ensured with contactless charge transfer and an improved resolution of the pixels.
  • an electron beam gun 1 has an evacuated housing 2 to avoid scattering of the electrons on air molecules.
  • a beam generation system 3 for emitting electrons, for accelerating to a certain speed and for beam focusing is introduced in the housing 2.
  • a beam shaping system 4 which essentially has electrostatic or magnetic lenses, and a deflection system 5, which is likewise constructed from electrostatic or magnetic deflection elements.
  • the gas pressure in the housing 2 should not be greater than approximately 10 -3 mbar.
  • a pump 6 preferably a high vacuum pump such as a turbomolecular, cryogenic or diffusion pump, is attached to the housing 2.
  • the beam generation system 3, the beam shaping system 4 and the deflection system 5 are followed by an imaging space 7 which is closed by apertures, tubes or the like. is separated from the rest of the housing 2 and can be evacuated by means of a pump 8.
  • the imaging space 7 is delimited by means of an extension 13 arranged on the underside of the housing 2 and modeled on the surface of the printing form 9.
  • An electron detector device 29 is arranged in the imaging space 7 above an impact point 30 of the electron beam 12 on the printing form 9.
  • the electron beam gun 1 is attached radially over a pressure roller 10 provided with a ferroelectric layer 9 to the layer 9 in a contactless manner.
  • a positively chargeable contact strip 11 is arranged along the pressure roller 10 parallel to its axis.
  • the electron beam 12 generated by the electron beam gun 1 is brought directly onto the ferroelectric printing form 9 of the printing roller 10 which passes beneath it.
  • the printing form 9, which was previously positively polarized by means of the contact strip 11, or the previously non-polar printing form 9, is thereby polarized negatively by the negatively charged electrons.
  • Depolarization can also be done using a heat source, e.g. a laser, heated pens, or the like, by heating the ferroelectric material above the Curie point.
  • the primary electrons emerging from the beam generation system 3 are accelerated by a controllable direct voltage and bundled into an electron beam 12 by electron lenses.
  • the Electron beam 12 is guided so that it scans the printing roller 10 rotating under the electron beam gun 1 point by point.
  • the interaction of the fast primary electrons with the ferroelectric printing form 9 of the roller 10 creates secondary electrons 28 which emerge from the surface of the ferroelectric printing form 9 in a substantially disordered manner and can be measured as a secondary electron current by means of the electron detector device 29.
  • the electron detector device 29 is essentially designed as a ring-shaped, electrically conductive electron catcher, which in the simplest embodiment is constructed from a simple sheet metal. Better sensitivity is achieved with arrangements that use photomultipliers. In principle, all arrangements are possible that are also used in scanning electron microscopy.
  • the secondary electron current 28 can be represented in a known manner on a cathode ray tube deflected synchronously with the primary electron beam 12 as the intensity of the pixels.
  • the secondary electron yield is dependent on the type of material and the topography of the surface of the ferroelectric printing plate 9 of the printing roller 10 and also on the surface potential of the charged printing plate 9.
  • the contrast in the secondary electron image produced by changing the topography can be used to detect defects on the surface of the latter
  • the potential contrast superimposed on the contrast is a direct measure of the state of charge of the ferroelectric printing form 9 and this in turn is a measure of the degree of polarization generated in the corresponding pixel.
  • the gray scale value in the secondary electron image is thus a measurement variable 31 for the pictorial labeling of the ferroelectric layer.
  • this measurement variable 31 is used to control or regulate the information transmission unit 32 in such a way that, for example, the spot size can be influenced electronically by controlling the focusing 33, the degree of polarization by controlling the dwell time 34 of the electron beam in a pixel.
  • the electron beam 12 provides a sufficient amount of charge and enables a short imaging time.
  • the resolution of the individual halftone dots can reach an order of magnitude of less than 10 micrometers. With the devices available from video technology, inertia-free control of the electron beam 12 is possible.
  • the spot size control is very simple to do by defocusing in the beam shaping system 4 of the electron beam gun 1.
  • the pictorial polarization is completely contactless, i.e. without abrasive material stress. Polarizing is easier at high temperatures than at low temperatures.
  • the electron energy adjustable in the electron beam gun 1 by the acceleration voltage of the beam generation system 3 enables defined local heating and facilitates polarization.
  • An obstacle to the use of the electron beam 12 as a writing element is the need to guide it in a vacuum, since the range of the electrons is too short at normal pressure.
  • a pair or more sliding seals 14 are attached between the extension 13 and the ferroelectric printing form 9 of the printing roller 10 on each side of the housing 2.
  • a pump connection 15 for connecting a pump is provided between each two sliding seals 14 on one side.
  • the electron beam generating system 3 is separated from the imaging chamber 17 by means of diaphragms 16 or tubes and can be kept at a vacuum of less than 10 ⁇ 4 mbar by means of the pumps 6 and 8.
  • ferrofluids 18 are used between the extension 13 of the housing 2 and the ferroelectric layer 9 of the pressure roller 10 for sealing.
  • a ferrofluid 18 is a suspension of magnetic particles in a carrier liquid. If a ferrofluid 18 is introduced into the gap 19 between the housing 2 and the surface of the printing form 9, it forms a ring which is focused from the sealing technology of rotary unions in a known manner by means of a permanent magnet 20 and hermetically seals the housing 2 of the electron beam gun 1 against the printing form 9 from.
  • Another embodiment uses a vacuum-tight window instead of the vacuum lock to seal the housing 2 of the electron beam gun 1 against normal pressure. It is preferably attached between the beam generator system 3 and the imaging space 17 instead of an aperture.
  • Such windows made of thin metal or oxide foils have long been known as Lenard windows. They guarantee an electron loss below 10 percent and are also mechanically stable enough to withstand a pressure difference of 1 bar.
  • FIG. 4 A variation of the electron gun 3 is illustrated in FIG. 4. Since the electron loss in the window strongly depends on the electron energy, an electron beam 21 is first strongly accelerated from a first electrode 22 to a central electrode 23 by means of the voltage + U2 and then braked to a third electrode 24 by means of the voltage - U2. A window 25 is preferably introduced here in the beam direction after the opening of the central electrode 23, so that only very small losses occur.
  • the evacuated housing 2 of the electron beam gun 1 has a plate 27 made up of a plurality of channels 26 at the location of the electron beam outlet. So-called micro-channel plates are preferably used, with channels with a diameter of 10 to 20 micrometers. These channels 26 shield the evacuated housing 2 against the outside normal pressure. At the same time, the channels 26 provide the resolution elements of the image-writing device. The resolution that can be achieved in this case depends on the distance between the plate 27 and the surface of the printing form 9, since the charge current can no longer be geometrically controlled due to the short range of the electrons at normal pressure.
  • the effect of charge increase in the channels 26 proves to be particularly advantageous, namely that the high-energy electrons generate secondary charge carriers through collisions with the gas molecules in the channels 26 and with the channel wall, which leads to a greatly increased charge carrier current on the surface of the printing form 9 to lead.
  • a special selection of the medium in the channels results in up to 20-fold charge carrier reinforcement.
  • the charge image generated on the printing plate 7 by the device according to the invention is also suitable for the recording of charged toner particles corresponding to the charge image.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Electron Beam Exposure (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (7)

  1. Appareil pour l'enregistrement et l'effacement d'images par polarisation ou dépolarisation d'une forme d'impression revêtue d'une matière ferro-électrique, et d'un dispositif d'effacement correspondant, destiné à la dépolarisation ou à la transpolarisation de la forme d'impression, caractérisé en ce qu'un faisceau d'électrons (12) issu d'un canon à électrons (1) et circulant dans le vide, qui peut être piloté au moyen d'une unité (32) de transmission de l'information, est projeté directement sur la forme d'impression (9) pour polariser des zones pédéterminées de la forme d'impression (9).
  2. Appareil selon la revendication 1, caractérisé en ce que le canon à électrons (1) présente une chambre (17) de formation de l'image qui est isolée hermétiquement de la pression normale par un sas à vide.
  3. Appareil selon la revendication 2, caractérisé en ce qu'il est prévu des garnitures d'étanchéité glissantes pour fermer hermétiquement la chambre (17) de formation de l'image.
  4. Appareil selon la revendication 2, caractérisé en ce qu'on utilise des ferro-fluides (18) pour la fermeture hermétique de la chambre (17) de formation de l'image.
  5. Appareil selon la revendication 1, caractérisé en ce que le boîtier (2) du canon à électrons (1), dans lequel on a fait le vide, présente une fenêtre (25) étanche au vide.
  6. Appareil selon la revendication 1, caractérisé en ce que le boîtier (2) du canon à électrons (1), dans lequel on a fait le vide peut être fermé par une plaque (27) composée d'une multiplicité de canaux (26).
  7. Appareil selon la revendication 1, caractérisé en ce que, dans la région qui surmonte un point d'impact (30) du faisceau d'électrons (12) sur la forme d'impression (9), est prévu un dispositif détecteur d'électrons (29) qui reçoit les signaux issus de la forme d'impression (9) sous la forme d'électrons secondaires 28
EP91119321A 1990-12-07 1991-11-13 Dispositif pour la description selon une image d'une plaque d'impression Expired - Lifetime EP0490105B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4039105 1990-12-07
DE4039105A DE4039105C2 (de) 1990-12-07 1990-12-07 Vorrichtung zur bildmäßigen Beschreibung einer Druckform

Publications (2)

Publication Number Publication Date
EP0490105A1 EP0490105A1 (fr) 1992-06-17
EP0490105B1 true EP0490105B1 (fr) 1994-12-28

Family

ID=6419825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119321A Expired - Lifetime EP0490105B1 (fr) 1990-12-07 1991-11-13 Dispositif pour la description selon une image d'une plaque d'impression

Country Status (5)

Country Link
US (1) US5194881A (fr)
EP (1) EP0490105B1 (fr)
JP (1) JP3073575B2 (fr)
CA (1) CA2056493C (fr)
DE (2) DE4039105C2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212582A1 (de) * 1992-04-15 1993-10-21 Hell Ag Linotype Verfahren zur Gravur von Druckformen sowie Druckform zur Durchführung des Verfahrens
DE4213013C2 (de) * 1992-04-21 1995-11-16 Frankenthal Ag Albert Vorrichtung zum Erzeugen eines zu druckenden Musters auf einer Druckform-Hülse
DE4235242C1 (de) * 1992-10-20 1993-11-11 Roland Man Druckmasch Löschbare Druckform
US5446687A (en) * 1994-01-31 1995-08-29 Terastore, Inc. Data storage medium for storing data as a polarization of a data magnetic field and method and apparatus using spin-polarized electrons for storing the data onto the data storage medium and reading the stored data therefrom
US5546337A (en) * 1994-01-31 1996-08-13 Terastore, Inc. Method and apparatus for storing data using spin-polarized electrons
US6304481B1 (en) 1994-01-31 2001-10-16 Terastore, Inc. Method and apparatus for storing data using spin-polarized electrons
DE19640649A1 (de) * 1996-10-02 1998-04-16 Roland Man Druckmasch Antrieb für eine Bogendruckmaschine
US5927206A (en) * 1997-12-22 1999-07-27 Eastman Kodak Company Ferroelectric imaging member and methods of use
US6061265A (en) * 1998-12-23 2000-05-09 Intel Corporation Quantum magnetic memory
US6639832B2 (en) 2001-08-08 2003-10-28 Intel Corporation Quantum magnetic memory

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE525595A (fr) * 1953-01-10
DE1571833C3 (de) * 1965-04-03 1975-04-30 Fuji Shashin Film K.K., Kanagawa (Japan) Verfahren zur Herstellung von Flachdruckformen oder hektographischen Druckformen
US3673597A (en) * 1970-04-02 1972-06-27 Ncr Co Method and apparatus for recording and/or displaying images utilizing thermomagnetically sensitive microscopic capsules
US3795009A (en) * 1970-06-17 1974-02-26 Bell & Howell Co Information recording methods, apparatus and media using deformable magnetized materials
DE2530290A1 (de) * 1974-07-08 1976-01-22 Hitachi Ltd Verfahren und vorrichtung zum kopieren
US3999481A (en) * 1974-11-15 1976-12-28 Xerox Corporation Method for making a master
DE2819993C3 (de) * 1978-05-08 1982-01-28 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Mundstück zur Ankoppelung einer Elektronenstrahlkanone an Druckformzylinder
US4307165A (en) * 1980-10-02 1981-12-22 Eastman Kodak Company Plural imaging component microcellular arrays, processes for their fabrication, and electrographic compositions
DE3175839D1 (en) * 1981-10-10 1987-02-19 Hell Rudolf Dr Ing Gmbh Electron beam engraving method and apparatus for carrying it out
US4446858A (en) * 1982-06-28 1984-05-08 Verter Allan H Arm and shoulder brace
FR2581212B1 (fr) * 1985-04-26 1988-06-17 Commissariat Energie Atomique Imprimante a canon a electrons
DE3633758A1 (de) * 1986-10-03 1988-04-07 Man Technologie Gmbh Druckmaschine

Also Published As

Publication number Publication date
JPH04275148A (ja) 1992-09-30
DE4039105A1 (de) 1992-06-11
DE59104069D1 (de) 1995-02-09
DE4039105C2 (de) 1994-12-08
US5194881A (en) 1993-03-16
EP0490105A1 (fr) 1992-06-17
CA2056493C (fr) 1997-02-25
CA2056493A1 (fr) 1992-06-08
JP3073575B2 (ja) 2000-08-07

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