EP0802049B1 - Procédé d'impression demi-tons et machine d'impression pour sa réalisation - Google Patents

Procédé d'impression demi-tons et machine d'impression pour sa réalisation Download PDF

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Publication number
EP0802049B1
EP0802049B1 EP96106202A EP96106202A EP0802049B1 EP 0802049 B1 EP0802049 B1 EP 0802049B1 EP 96106202 A EP96106202 A EP 96106202A EP 96106202 A EP96106202 A EP 96106202A EP 0802049 B1 EP0802049 B1 EP 0802049B1
Authority
EP
European Patent Office
Prior art keywords
printing
tone
stencil
optical data
rotary
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
EP96106202A
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German (de)
English (en)
Other versions
EP0802049A1 (fr
Inventor
Heinz Mungenast
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.)
Schablonentechnik Kufstein GmbH
Original Assignee
Schablonentechnik Kufstein GmbH
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
Priority to ES96106202T priority Critical patent/ES2129907T3/es
Application filed by Schablonentechnik Kufstein GmbH filed Critical Schablonentechnik Kufstein GmbH
Priority to DE59601451T priority patent/DE59601451D1/de
Priority to EP96106202A priority patent/EP0802049B1/fr
Priority to AT96106202T priority patent/ATE177684T1/de
Priority to US08/833,450 priority patent/US5907996A/en
Priority to JP9093966A priority patent/JP3046780B2/ja
Priority to CN97104202A priority patent/CN1078133C/zh
Publication of EP0802049A1 publication Critical patent/EP0802049A1/fr
Application granted granted Critical
Publication of EP0802049B1 publication Critical patent/EP0802049B1/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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0831—Machines for printing webs
    • B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/10—Starting-up the machine

Definitions

  • the invention relates to a halftone test printing method according to the claim 1 mentioned type and a rotary stencil printing machine according to the preamble of claim 8.
  • a halftone printing stencil with at least one is already known from EP-A-0 679 510 known two areas, the uniform stencil opening structures which, however, differ from area to area are.
  • test prints in a screen printing process carry out several test prints.
  • a firm base can be a drum, for example.
  • the trial prints will be optimized with these methods, d. H. the test prints are made with a Original (optical target data) compared. Depending on this comparison the printing parameter "delivery pressure of the doctor blade" is changed until the desired result has been achieved.
  • Templates for textile printing which in some areas and due to the pattern to be generated different amounts of color per unit area apply (halftone printing) are generally known. It can these stencils around flat stencils or rotary printing stencils act. These stencils can be screen printing stencils, flexographic printing stencils, Gravure stencils, etc. Common to all that they have uniform stencil opening structures in different stencil areas have, however, from area to area are different. In the case of screen printing stencils are in different Stencil areas the screen openings one with masking varnish coated screen covered or exposed to different degrees, to different degrees of permeability in the respective areas to obtain. The sieve could also be made from the start be that there are different screen openings in different areas having. The latter also applies to the flexographic stencils or gravure stencils mentioned above, where, however, there are no through openings.
  • template opening structure refers to that in the surface of the above-mentioned stencils.
  • nickel is exposed at the exposed areas of the metallic Sheath of the hollow cylinder deposited, while in the places where a lacquer point has remained, a hole is created in the nickel coating.
  • a galvanic process is a sleeve or galvano template pattern-dependent openings of different diameters in different Preserved sample areas, which is why later during the Printing different amounts of color through the respective pattern areas.
  • Stencils of the type mentioned above can also be sprayed on Liquid is generated on the template base cylinder.
  • the different permeability of the template areas by different long switch-on or switch-off times of a spray nozzle used.
  • this would allow an evenly perforated sieve to be used Way with top coat to immediately different To obtain areas with different degrees of permeability.
  • the masking layer which is used for electroplating a corresponding sieve on the closed surface of a carrier body is injected.
  • a sieve could have a polymerizable cover layer first sprayed an opaque liquid according to the pattern after which a large-scale exposure takes place. After curing the A development process would then take place in uncovered layer regions.
  • the invention has for its object to provide a halftone test printing process to produce halftone prints more free of interference or true to color can.
  • the template opening structures can be those that already existing sieve openings through one coming to rest on it Lacquer layer are more or less covered.
  • the template opening structures can also be directly sieve openings that are mentioned in the Areas each have different sizes. After all, should under template opening structures also such recesses or depressions are understood, which are in the surface of a gravure or flexographic printing form are located.
  • the color values and / or the color intensities are preferably used as optical data used. They are very easy to grasp and assess visually.
  • the optical data of the respective Printed images can also be measured electronically, including the comparison the optical data with the corresponding setpoints and the adjustment the printing parameter can be carried out automatically. This makes possible uninterrupted operation of the printing press and thus one faster start of printing.
  • the areas mentioned now come outside the actual pattern area of the halftone printing stencil so that the corresponding print images, which are assigned to these areas, outside of the actual halftone pattern are printed.
  • area marks The areas mentioned outside the actual pattern area of the halftone printing stencil are to be referred to as area marks below. In these surface marks are therefore uniform template opening structures available, but different from area mark to area mark are.
  • the print images obtained in each case using the area marks on the web are referred to below as area mark images.
  • the surface marks can lie directly on one another or separately or be arranged at a distance from each other.
  • the printer can match the specified target colors or target intensities change the setting parameters of the respective inking unit. Also an automatic one Measurement and readjustment is possible, as already mentioned.
  • these include Printing parameters of an inking unit the contact pressure of the squeegee or, in the case of coating squeegees the curvature of the stroking lip, the printing speed, the Doctor blade diameter, ink sump height and ink viscosity.
  • doctor blades their shape, more precisely the curvature of the doctor blade lip, by pushing the squeegee down more or less on the end faces the template can be changed.
  • For printing machines with magnetic Squeegee attraction can increase the pressure of the squeegee by strengthening or weakening it of the magnetic field can be changed.
  • test prints In order to be able to engrave a halftone pattern correctly, first use a Sequence of test prints with engravings that have different permeabilities, made a test halftone print. This is then measured d. that is, the intensity of the color application is determined and the position of the color value is determined in a color system suitable for the color determination. Such color systems are known and z. B. standardized under DIN 5033 and DIN 6164.
  • This test print is expediently printed on a printing press carry out which either the future production machine is or at least corresponds to the design.
  • the type of engraving of the Test templates will be the type of engraving of the envisaged production templates correspond.
  • the test prints will be made that the previously mentioned setting parameters of the printing press in predetermined Limits can be varied in stages. When evaluating such test prints you then get tabular assignments of color intensities to opening ratios the engraving. Certain tables also belong to each table Values of the setting parameters specified above.
  • the color value or the color intensity of the Print under the area marks either immediately after each stencil a reading device (video camera, color scanner) read out or at the latest at the end of the machine, i.e. when the machine is running out, using a measuring device which is common for all printing stations.
  • a reading device video camera, color scanner
  • a measuring device which is common for all printing stations.
  • an experienced printer can visually assess the color loss and correct the printing parameters by hand. If necessary, this is done with the help of a comparison sample.
  • the mechanical measurement of the color loss and the computer-controlled Processing of this measurement result will then be provided if the press is equipped so that at least some of the mentioned setting parameters by servomechanics or servomotors can be changed.
  • the measuring device In the event that there are no surface marks on the edge of the template are, and as a replacement of these area marks areas of the actual To serve as a template, the measuring device must have the to be able to measure printed areas in these areas on which Printing machine can be arranged movable. Your route can then be computer controlled can be set.
  • a rotary stencil printing machine stands out according to the invention by an optical measuring device for measurement optical data in predetermined areas of halftone printing, the uniform Have template opening structures that vary from area to area are different; and a control device for changing Print parameters depending on the optical data measured in each case of the at least two areas to the optical data of the at least to approximate two ranges to a respective setpoint.
  • Figure 1 shows a halftone rotary printing stencil 1, which in its middle part 2 is equipped with a pattern engraving 3, the different Permeability in different areas having.
  • area marks 4 At the front edge of the halftone rotary printing template 1 there are several, here separate area marks 4, each one had uniform permeability, but the permeability Distinguish from area mark 4 to area mark 4.
  • the area marks 4 are nothing other than predetermined ones Engraving areas in which there are stencil openings of one size, which are smaller compared to a standard size. Is the halftone rotary printing template 1 z. B.
  • the uniform Sieve structure is covered by a lacquer layer, so are in the area marks 4 the screen openings each at different distances from the lacquer layer covered to 4 different in different area marks To achieve permeability.
  • a print mark 5 (Pico) provided, which is realized here by a circular ring and which for easier Bringing a precisely fitting print on a printing press stencils 1 arranged one behind the other.
  • This print mark 5 is also located at the front edge of the halftone rotary printing stencil 1 outside the Pattern engraving 3.
  • a trial print is made using such a halftone rotary printing stencil 1 carried out, so the printed area marks 4 for the purpose a comparison standard is held for the visual assessment of the engraving, which z. B. consists of printed fabric with correct tonal values. With such a visual The press must of course be stopped for comparison. Poses it turns out that the printed area marks 4, that is, the respective printed images of the area marks 4 deviate from the respective comparison standard, so Adjusted printing parameters accordingly, so that the next Print the printed area marks better in accordance with the respective Comparison standards.
  • a rotary stencil printing machine 6 is shown, on which several 1 equipped stencils 1 are used.
  • the templates 1 via gears 7 and repeat gear 8 driven so that it is synchronized with that under the stencils 1 through the machine 6 run web 9 or the printing blanket 10 run.
  • the gears 7 are attached to template heads, which are glued into the front of the templates 1 become.
  • the web 9 is on the blanket 10 with a very light removable adhesive is glued on and this is therefore from the printing blanket 10 during of the pressure.
  • the printing blanket 10 is a very wide rubber fabric conveyor belt with a very smooth surface and with one if possible uniform bending behavior across the width. This printing blanket 10 overflows two deflection rollers 11 and 15, which are wrapped by the printing blanket 10.
  • the rear deflection roller 15 is driven by a DC motor 16. This deflecting roller pulls the printing blanket 10 under the stencils 1.
  • the front deflecting roller 11 is driven by the printing blanket 10.
  • the Deflection roller 11 drives the individual repeat gear 8 via one of these FIGS. 2 by the side wall 14 concealed bevel gear and an equally concealed Countershaft. With this arrangement, the mentioned synchronous operation between Stencils 1 and web 9 to be printed reached.
  • the area marks 4 Each template 1 will be put on the web along with the pattern 9 printed there and give surface mark images 12.
  • a video camera 13 is mounted on the side wall 14 at the end of the printing press 6 and continuously measures the color values and intensities of the area mark images 12. The recorded video images are sent to a computer 17 via a data line 18 sent.
  • Adjusted controller 20 which affects the speed of the DC motor 16, or a servomechanism is influenced via the signal line 21, which the position or the pressure of one of the squeegees mounted in the stencils 1 changed.
  • FIG 3 shows a single inking unit of the rotary stencil printing machine 6 shown.
  • the template 1 is equipped with surface marks 4.
  • Small rollers 22 support the template 1 in its ends so that the template 1 cannot change its position in relation to the machine 6. These roles 22 are supported in roller blocks 23 which run along slide guides 24 adjusted and adjusted to different template diameters can.
  • gears 25 on the Template 1 attached and connected to it in a rotationally fixed manner.
  • gearboxes are housed on both sides of the machine. From these gears are only the meshing with the template 1 gear 26 to detect.
  • the countershafts 27 run above
  • the right side wall 14 is a servomechanism 28 for pivoting a doctor blade 29 provided in template 1. Also a bearing block 30 of this doctor blade 29 is servomechanically adjustable in the vertical direction.
  • a signal line 21 leads to each of the two devices Computer 17 comes and via which the two servo mechanics the required Adjustment commands are sent.
  • the height adjustment the doctor blade 29 is made by a double rocker 32.
  • the one on her left end is held rotatably in a fixed bracket 33 and their right end can be raised or lowered by the servomechanism 34 can.
  • the servomechanism engages with the projecting end of a single rocker 35 28 on. If this end is raised or lowered by the servomechanism 28, then the doctor blade 29 rotatably mounted in the double rocker 32 is pivoted, The thin, deformable doctor blade 36 is attached to the doctor blade 29. If the doctor blade 29 is lowered, the curvature of the changes Doctor blade 36 and especially the wedge angle, which the end of the doctor blade 36 with template 1.
  • the doctor blade 29 By pivoting the doctor blade 29 can especially the zone of the color exit from the template 1 in its direction of rotation be moved forward or back. Both parameters affect the amount of dye that exits the template 1 or enters the web 9.
  • the outside diameter of the template 1 corresponds to the pitch circle diameter of the gear 25, which is attached to the template 1 and with the gear 26 of the repeat gear combs.
  • FIG. 5 shows the cross section of a rotary stencil printing station, in which a squeegee 36 inside a template 1 by electromagnets 38 presses against the inner wall of the template 1, which in turn to the Web 9 and the printing blanket 10 is pressed.
  • the printing blanket 10 is running above a printing table 37.
  • the ends of the cores 39 of the electromagnets 38 open into a groove 41 of the printing table 37, so that when heated and thereby conditional expansion not unevenly from below against the printing blanket 10 queue and cause streaky color loss; a heating up because of the winding body 40 is not avoidable in this type.
  • the winding body 40 is electrically connected to a via the leads 47 voltage variable DC source 48 connected. Before the doctor roll 36 is paint in the form of a swamp 42.
  • Liquid paint from the swamp 42 becomes from the moving wall of the template 1 and also from the wall of the general also rotating doctor roller 36 in the conical gap between the doctor roller 36 and template 1 are drawn in and through the pattern-related openings the template 1 pressed into the web 9. So that a high magnetic Flow as free of resistance as possible and free from scattering by the magnetic Doctor roller 36 is guided, are arranged in the longitudinal direction of the template 1 Magnets 38 alternately poled and at their lower ends by one magnetic yoke 43 connected.
  • the printing table 37 serves the hollow support 44.
  • This and the printing table 37 are made of a magnetic non-conductive material, such as aluminum.
  • the doctor blade 36 will through a stop bar 45, the liquid pressure generated in the sump 42 and held in place by the magnetic forces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Screen Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color, Gradation (AREA)

Claims (15)

  1. Procédé d'impression d'épreuve en demi-tons présentant les étapes ci-après :
    préparation d'au moins un patron d'impression demi-tons (1) ayant au moins deux zones (4) qui présentent des structures à ouvertures de patron régulières, en étant cependant différentes d'une zone à une autre;
    réalisation d'une impression d'épreuve avec un tel patron d'impression à demi-tons (1) pour générer des images d'impression (12) associés aux zones (4) respectives;
    comparaison des données optiques des au moins deux images d'impression (12) avec des valeurs de consigne correspondantes; et, le cas échéant
    réajustement de paramètres d'impression de manière que les au moins deux images d'impression (12) s'approchent des valeurs de consigne correspondantes à l'occasion de l'impression subséquente.
  2. Procédé d'impression à demi-tons selon la revendication 1, caractérisé en ce que les données optiques des images d'impression (12) respectifs sont mesurées électroniquement.
  3. Procédé d'impression à demi-tons selon la revendication 2, caractérisé en ce que la comparaison entre les données optiques et les valeurs de consigne correspondantes ainsi que le réajustement des paramètres d'impression s'effectuent automatiquement.
  4. Procédé d'impression à demi-tons selon la revendication 1, 2 ou 3, caractérisé en ce qu'on exploite comme données optiques les valeurs de couleur et/ou les intensités de couleur.
  5. Procédé d'impression à demi-tons selon l'une des revendication 1 à 4, caractérisé en ce que les zones (4) citées sont situées à l'extérieur de la zone de modèle (3) proprement dite du patron d'impression à demi-tons (1).
  6. Procédé d'impression à demi-tons selon la revendication 5, caractérisé en ce que les zones (4) sont situées à distance les unes des autres.
  7. Procédé d'impression à demi-tons selon l'une des revendications 1 à 6, caractérisé en ce que l'on utilise comme patron d'impression à demi-tons (1) un patron cylindrique.
  8. Machine à imprimer à patron rotatif, comportant
    un dispositif de tourillonnement et d'entraínement (7, 8) destiné au tourillonnement et à la rotation d'au moins un patron d'impression à rotation à demi-tons (1); et
    une couverture d'impression (10) pour une bande de matériau (9) sur laquelle une impression en demi-tons peut être produite au moyen du patron d'impression à rotation à demi-tons (1); caractérisée par
    un dispositif de mesure optique (13) destiné à mesurer les données optiques dans des zones prédéterminées de l'impression à demi-tons, qui présentent des structures d'ouverture de patron régulières qui cependant sont différentes d'une zone à une autre zone, et
    une unité de commande (17, 20) destinée à modifier les paramètres d'impression en fonction des données optiques chaque fois mesurées, au moins deux zones (4), pour que les données optiques des au moins deux zones (4) s'approchent d'une valeur de consigne respective.
  9. Machine à imprimer à patron rotatif selon la revendication 8, caractérisée en ce que l'unité de commande (17, 20) contient un étage comparateur destiné à comparer les données optiques mesurées à des données de valeur de consigne optiques, ainsi qu'un étage de réglage destiné à modifier les paramètres d'impression en fonction du résultat de la comparaison.
  10. Machine à imprimer à patron rotatif selon la revendication 8 ou 9, caractérisée en ce que le dispositif de mesure (13), mesure à titre de données optiques, des valeurs de couleur et/ou des intensités de couleur.
  11. Machine à imprimer à patron rotatif selon l'une des revendications 8 à 10, caractérisée en ce que le dispositif de mesure (13) présente une caméra vidéo.
  12. Machine à imprimer à patron rotatif selon l'une des revendications 8 à 11, caractérisée en ce qu'il peut recevoir plusieurs patrons d'impression à rotation à demi-tons (1).
  13. Machine à imprimer à patron rotatif selon la revendication 12, caractérisée en ce qu'un dispositif de mesure (13) commun est prévu pour tous les patrons d'impression à rotation à demi-tons (1).
  14. Machine à imprimer à patron rotatif selon la revendication 12, caractérisée en ce qu'à chaque patron d'impression à rotation à demi-tons (1) est associé un dispositif de mesure (13) propre.
  15. Machine à imprimer à patron rotatif selon la revendication 13 ou 14, caractérisée en ce que le ou les dispositifs de mesure (13) prévus en plusieurs exemplaires sont dirigés sur le bord de la bande de matériau (9).
EP96106202A 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation Expired - Lifetime EP0802049B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE59601451T DE59601451D1 (de) 1996-04-19 1996-04-19 Halbton-Druckverfahren und Druckmaschine zu seiner Durchführung
EP96106202A EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation
AT96106202T ATE177684T1 (de) 1996-04-19 1996-04-19 Halbton-druckverfahren und druckmaschine zu seiner durchführung
ES96106202T ES2129907T3 (es) 1996-04-19 1996-04-19 Procedimiento de impresion a media tinta y maquina de imprimir para su realizacion.
US08/833,450 US5907996A (en) 1996-04-19 1997-04-07 Half-tone printing process
JP9093966A JP3046780B2 (ja) 1996-04-19 1997-04-11 ハーフトーン印刷方法及びハーフトーン印刷装置
CN97104202A CN1078133C (zh) 1996-04-19 1997-04-18 半色调印刷方法及实现该方法的印刷机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96106202A EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation

Publications (2)

Publication Number Publication Date
EP0802049A1 EP0802049A1 (fr) 1997-10-22
EP0802049B1 true EP0802049B1 (fr) 1999-03-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106202A Expired - Lifetime EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation

Country Status (7)

Country Link
US (1) US5907996A (fr)
EP (1) EP0802049B1 (fr)
JP (1) JP3046780B2 (fr)
CN (1) CN1078133C (fr)
AT (1) ATE177684T1 (fr)
DE (1) DE59601451D1 (fr)
ES (1) ES2129907T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59914564D1 (de) * 1999-04-14 2008-01-10 Daetwyler Ag Verfahren zur Erzeugung von Gravurdaten
NL2002915C2 (en) * 2009-05-22 2010-11-23 Mps Holding B V PRINTING MODULE AND PRINTING MACHINE PROVIDED WITH SUCH A PRINTING MODULE.
JP6131826B2 (ja) * 2013-10-30 2017-05-24 トヨタ紡織株式会社 乗物用シート
CN107901646B (zh) * 2017-11-21 2020-01-14 三河市数印通科技有限公司 一种解决数码印刷同色异谱现象的数码印刷方法
CN109177451A (zh) * 2018-07-30 2019-01-11 如皋市金轶纺织有限公司 纱线数码刮涂机
NL2023203B1 (en) * 2019-05-27 2020-12-02 Spgprints B V Screen printing, in particular rotary screen printing of textile materials

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605016A1 (de) * 1976-02-10 1977-08-11 Mitter & Co Rotationsdruckmaschine, insbesondere siebdruckmaschine mit mindestens einer druckstation
US4546700A (en) * 1981-12-30 1985-10-15 Kollmorgen Technologies Corporation Method and apparatus for sensing and maintaining color registration
EP0324718B1 (fr) * 1988-01-14 1992-07-08 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
DE8905925U1 (de) * 1989-05-11 1990-04-12 MBK Maschinenbau Kiefersfelden GmbH, 8205 Kiefersfelden Einrichtung zum winkelsynchronen Antreiben einzelner Druckschablonen einer Rotationssiebdruckmaschine
EP0408507B1 (fr) * 1989-07-14 1993-11-10 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramées imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
JP2599068B2 (ja) * 1991-10-24 1997-04-09 大日本スクリーン製造株式会社 網点形成方法
DE4240077C2 (de) * 1992-11-28 1997-01-16 Heidelberger Druckmasch Ag Verfahren zur zonalen Steuerung/Regelung der Farbführung in einer Druckmaschine
ATE167111T1 (de) * 1996-04-19 1998-06-15 Schablonentechnik Kufstein Ag Halbtonschablone sowie verfahren und vorrichtung zu ihrer herstellung

Also Published As

Publication number Publication date
JP3046780B2 (ja) 2000-05-29
EP0802049A1 (fr) 1997-10-22
JPH1035076A (ja) 1998-02-10
ATE177684T1 (de) 1999-04-15
CN1165091A (zh) 1997-11-19
CN1078133C (zh) 2002-01-23
US5907996A (en) 1999-06-01
ES2129907T3 (es) 1999-06-16
DE59601451D1 (de) 1999-04-22

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