EP0338025A1 - Emploi d'un dispositif pour impression par transfert à laser. - Google Patents

Emploi d'un dispositif pour impression par transfert à laser.

Info

Publication number
EP0338025A1
EP0338025A1 EP88902416A EP88902416A EP0338025A1 EP 0338025 A1 EP0338025 A1 EP 0338025A1 EP 88902416 A EP88902416 A EP 88902416A EP 88902416 A EP88902416 A EP 88902416A EP 0338025 A1 EP0338025 A1 EP 0338025A1
Authority
EP
European Patent Office
Prior art keywords
lambda
microcapsules
printing
laser
dye
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
EP88902416A
Other languages
German (de)
English (en)
Other versions
EP0338025B1 (fr
Inventor
Peter Kleinschmidt
Gerhard Mader
Hans Meixner
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.)
Siemens AG
Original Assignee
Siemens AG Oesterreich
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 Siemens AG Oesterreich filed Critical Siemens AG Oesterreich
Priority to AT88902416T priority Critical patent/ATE76609T1/de
Publication of EP0338025A1 publication Critical patent/EP0338025A1/fr
Application granted granted Critical
Publication of EP0338025B1 publication Critical patent/EP0338025B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/287—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using microcapsules or microspheres only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/34—Multicolour thermography
    • B41M5/345—Multicolour thermography by thermal transfer of dyes or pigments

Definitions

  • a print carrier e.g. a sheet of paper, the surface of the paper being coated directly with microcapsules, initially over the entire surface.
  • These microcapsules contain an ink used as printing ink.
  • this capsule is broken open, namely if the incident laser radiation has a certain minimum energy.
  • the ink contained in the capsule is absorbent for this laser radiation in such a way that the laser beam energy is absorbed by this ink.
  • the material of the wall of the capsule has such laser radiation absorption. It has also already been stated to use such material for the wall of the capsule that such a chemical reaction takes place when the laser radiation strikes that the capsules can be broken open with a minimum of radiation energy.
  • the printing process can be carried out without the use of printed letter masks in such a way that the individual letters are put together point by point by the appropriately controlled focused laser beam.
  • microcapsules hit by the laser radiation can be made conductive and can thus be detached from the originally all-over coating.
  • the sheet of paper is then placed in a mechanical crimping device with the coating of its surface corresponding to the positive of the print pattern with microcapsules directed where the transfer of the printing ink takes place with the bursting of the microcapsules.
  • microcapsules are filled with ink in a variety of colors, e.g. are distributed microcapsules with red ink contained therein and those with green ink contained therein.
  • Laser radiation with different wavelengths is used and microcapsules are provided which, depending on the color they contain, respond selectively to a respective wavelength of the laser radiation.
  • ink ribbon for transfer printing has been known for a long time from US Pat. No. 3,570,380.
  • the print medium e.g. Paper and this ink ribbon are brought into surface contact with one another at least in the intended printing area. Intensity hitting the ink ribbon causes the printing dye contained in the ink ribbon to be transferred to the printing medium.
  • This ribbon can be used for single color printing. Ribbons have also been used in devices described in more recent publications.
  • a thermal transfer printer (3P-A-58-110 270) the use of multicolored ink ribbon has already been provided, as is known from conventional typewriters, in which ink ribbons with parallel stripes of different color, e.g. black and red.
  • Microcapsules are now present on the print carrier in such a distribution as it corresponds to the previous irradiation of the ink ribbon or how this corresponds to the pattern to be printed.
  • a merely latent image is generated on the ink ribbon, this latent image is transferred to the print carrier when it comes into contact with the printing medium, and the latent image is only later converted into the actual image on the other in some other device, in particular a mechanical squeezing device Print media converted.
  • These known methods thus perform printing using several types of energy, for example radiation energy for generating the latent image and mechanical pressure for actually printing the latent image on the printing medium.
  • the object of the present invention is to implement such measures or to specify such a device for laser transfer printing, which works with a print carrier which is not necessarily specially prepared, for example with normal paper, which enables high printing speed and which ensures high registration accuracy for multicolor printing.
  • the invention is intended to make it unnecessary to have to carry out a subsequent treatment (removal of printing ink not used for printing).
  • a device for laser transfer printing with at least one laser beam source for the generators (each) of a focused laser beam, with an electrical control device for this beam source and its laser beam, with a receptacle for a print carrier, e.g. Paper in sheet or roll form, with a receptacle for an ink ribbon, which serves as a carrier for at least one printing dye, with a pressure device between which the ink ribbon and the printing medium are pressed together, this device permeable to the respective laser beam Has dissolved, and this ribbon is a carrier film that is coated with microcapsules, the carrier film being transparent to the one or more laser wavelengths used.
  • the microcapsules contain the printing dye.
  • there are microcapsules filled with differently colored printing dye which are distributed over the surface of the carrier film of the ribbon. The distribution can be random or patterned. For example, the latter can be a line pattern.
  • printing can be carried out, in which multi-color printing can also be carried out in a single pass.
  • This not only has the advantage that a high printing speed can be achieved, but also the coverage of the individual color images is not dependent on repeated adjustment or positioning of the printing medium and the laser beam control.
  • micro-in addition to the dye (of the respective color), capsules can also contain an absorber material which contributes to the fact that focused laser radiation which is directed toward a particular microcapsule, even at a relatively low intensity, causes this microcapsule to be broken open for the purpose of pressing is burst or the like. Additionally or alternatively, it can also be provided that the wall of the microcapsule consists of such a material that has an absorber effect for the laser radiation.
  • the microcapsules can contain a chemically reactive substance which, in the radiation provided, enables a reaction which releases more energy than was absorbed in the reactive substance by radiation energy. It can be provided that this process is wavelength-dependent.
  • laser radiation sources with different wavelengths are used and those absorber materials are used which selectively respond to one of the respective wavelengths.
  • a specific printing ink can then be controlled with the radiation of a specific laser wavelength, the associated microcapsules of which are burst. It is then printed in this color at the respective location. In this way, several colors can be selectively printed practically in the same place at the same time, with the result that the printing point has the corresponding mixed color.
  • Laser diodes are particularly suitable for realizing the invention as a laser beam source.
  • Ga-As laser diodes with a wavelength of 0.81 ⁇ m and InGaAsP laser diodes with a wavelength of 1.3 and 1.6 ⁇ m are available.
  • FIG. 1 shows a simple device for preferably single-color printing.
  • the print carrier e.g. Paper
  • designated. 2 denotes a piece of the ink ribbon used according to the invention with a carrier film 3 and the layer 4 thereon with microcapsules.
  • This layer 4 with the microcapsules faces the printing surface of the printing medium 1.
  • the pressure device consists of a body 5 transparent to the laser radiation to be described below and a counter surface 6 e.g. a roller.
  • FIG. 7 denotes a laser diode array. It is sufficient if this array is a linear arrangement of laser diodes. 8 is a condenser and 9 an imaging lens. The rays of the peripheral laser diodes of this array are shown in the figure at 10 and 11. The electrical control is designated by 12. Depending on which of the laser diodes of the array is controlled, a respective narrowly delimited area (dot) in the layer 4 of the microcapsules is irradiated. The absorption of the laser radiation striking the microcapsules in question leads to the destruction of the microcapsules and to the release and transfer of the printing dye contained in these microcapsules onto the surface of the print carrier.
  • dot narrowly delimited area
  • Figure 2 shows an embodiment of a device according to the invention, which is specially designed for multicolor printing.
  • the print medium e.g. Paper, again labeled 1.
  • the ink ribbon is designated 2 and touches the paper at least at location P of the printing process to be carried out at the moment.
  • the layer containing the microcapsules 41 on the carrier film 3 is again designated by 4.
  • the microcapsules 41 each contain printing fluid of different colors.
  • the different colored microcapsules are e.g. mixed closely distributed.
  • the optics are designated 21 overall. It comprises three laser arrays 22, 23 and 24, which have mutually different wavelengths Lambda 1, Lambda 2, Lambda 3 of the respectively emitted laser beam.
  • differently colored microcapsules 41 are used which selectively respond to the different wavelengths lambda 1, lambda 2 or lambda 3.
  • microcapsules with yellow dye respond, for example, only to a beam of wavelength lambda 2.
  • microcapsules of the color cyan which respond to the laser beam with the wavelength lambda 3.
  • control devices used here for the individual laser diode arrays 22 to 24 are also not shown.
  • FIG. 3 shows, in greatly enlarged representation, the Farb ⁇ ribbon 2 with spaced in the layer 4 microcapsules 41.
  • the letters Y, M and C represent the respective color of the Druckf ⁇ rbstoffes contained in the respective microcapsules 4 and represent the well-known complementary colors Yellow, magenta and cyan.
  • the laser beam of the laser diode array 23 with the wavelength lambda 1, which is focused on the layer of the microcapsules 41, can only burst microcapsules with the color magenta. This result is shown in FIG. 3.
  • the leaking, magenta-colored liquid 25 wets or dyes the paper at the relevant location P, thus producing a printing dot (dot) with this color.
  • the reproduction of the color "black” can be improved if additional microcapsules with black printing ink are provided for this purpose.
  • Figure 4 shows the respective spectral absorption Y, M and C of the dyes yellow, magenta and Cya ⁇ .
  • the figure also contains 4 shows the laser wavelength ranges Lambda 1, Lambda 2 and Lambda 3 for corresponding diode lasers.
  • Selective absorber materials are used which respond to the respective wavelength lambda 1 or lambda 2 or lambda 3 and whose absorption spectrum is represented by A, A2 and A-.
  • copper-II-chloride is suitable as an absorber for the wavelength lambda 1 of the galllum aluminum arsenide laser diode.
  • a microcapsule 41 of the color in which this absorber substance with the absorption spectrum A is contained can then be burst with the radiation of this laser diode.
  • this this is the color magenta.
  • the microcapsules 41 with the differently colored printing dyes contained therein can also be arranged in a pattern on the ink ribbon 2 or on its carrier film 3 with respect to the individual colors. This pattern can be periodically consecutive, parallel lines arranged according to colors.
  • the microcapsules of a particular color can then be controlled by the laser radiation without the need for wavelength-selective measures.
  • a laser diode array with a wavelength is sufficient to cover all colors, i.e. to control all lines in succession.
  • it can also be used for e.g. d.ei colors three laser diode arrays are provided, each of which controls the rows of the respective assigned color.
  • the multicolor print can thus also be carried out simultaneously.
  • An advantage of such an embodiment is that it is not necessary for the microcapsules to respond selectively to (different) wavelength ranges of the focused laser radiation. It is therefore sufficient to provide a single absorber substance.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Electronic Switches (AREA)
  • Color Printing (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)

Abstract

Impression par transfert à laser, notamment impression en plusieurs couleurs, pour laquelle est utilisé un ruban encreur (2) revêtu de microcapsules (41) contenant les différentes encres d'impression.
EP88902416A 1987-03-27 1988-03-23 Emploi d'un dispositif pour impression par transfert à laser Expired - Lifetime EP0338025B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88902416T ATE76609T1 (de) 1987-03-27 1988-03-23 Anwendung einer vorrichtung fuer lasertransferdruck.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3710183 1987-03-27
DE19873710183 DE3710183A1 (de) 1987-03-27 1987-03-27 Vorrichtung fuer laser-transferdruck

Publications (2)

Publication Number Publication Date
EP0338025A1 true EP0338025A1 (fr) 1989-10-25
EP0338025B1 EP0338025B1 (fr) 1992-05-27

Family

ID=6324162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88902416A Expired - Lifetime EP0338025B1 (fr) 1987-03-27 1988-03-23 Emploi d'un dispositif pour impression par transfert à laser

Country Status (5)

Country Link
EP (1) EP0338025B1 (fr)
JP (1) JPH02502708A (fr)
AT (1) ATE76609T1 (fr)
DE (2) DE3710183A1 (fr)
WO (1) WO1988007450A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486905B2 (en) * 1998-01-06 2002-11-26 Asahi Kogaku Kogyo Kabushiki Kaisha Image-forming substrate and image-forming system using same

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DE3731835A1 (de) * 1987-09-22 1989-03-30 Siemens Ag Laserstrahl-induziertes farbdrucken
DE3817625A1 (de) * 1988-05-25 1989-11-30 Agfa Gevaert Ag Verfahren und vorrichtung zur herstellung einer thermokopie
GB2223604B (en) * 1988-09-06 1992-08-19 Mitsubishi Electric Corp Printer
DE3911813C2 (de) * 1989-04-11 1998-08-13 Eastman Kodak Co Verfahren und Vorrichtung zum laserstrahlungsinduzierten Transferdruck mit Druckfarbträger mit Mikrokapseln
DE3918146A1 (de) * 1989-05-31 1990-12-06 Siemens Ag Mikrokapseln mit einer polymeren kapselwand
DE69015539T2 (de) * 1989-09-28 1995-08-03 Fuji Photo Film Co Ltd Verfahren zur Bildformung auf wärmeempfindlichem Aufzeichnungsmaterial.
DE3937203C2 (de) * 1989-11-08 2001-11-22 Oce Printing Systems Gmbh Elektrophotographisches Druckverfahren
US5105206A (en) * 1989-12-27 1992-04-14 Eastman Kodak Company Thermal printer for producing transparencies
US5170178A (en) * 1991-03-26 1992-12-08 Minolta Camera Kabushiki Kaisha Thermal transfer recording apparatus
US5252425A (en) * 1991-08-19 1993-10-12 Eastman Kodak Company Hard copy imaging system
US5240900A (en) * 1992-12-17 1993-08-31 Eastman Kodak Company Multicolor, multilayer dye-doner element for laser-induced thermal dye transfer
US5334575A (en) * 1992-12-17 1994-08-02 Eastman Kodak Company Dye-containing beads for laser-induced thermal dye transfer
US5234891A (en) * 1992-12-17 1993-08-10 Eastman Kodak Company Mixture of dye-containing beads for laser-induced thermal dye transfer
US5234890A (en) * 1992-12-17 1993-08-10 Eastman Kodak Company Multicolor dye-containing beads for multilayer dye-donor element for laser-induced thermal dye transfer
US5625402A (en) * 1993-04-30 1997-04-29 Eastman Kodak Company Digital printers using multiple lasers or laser arrays with different wavelengths
DE19707274C2 (de) * 1997-02-24 2002-02-21 Ruediger Kreuter Vollfarbdruckverfahren
ES2442777T3 (es) 2010-11-08 2014-02-13 U-Nica Technology Ag Procedimiento y dispositivo para la generación de imágenes en color con un láser UV sobre sustratos pigmentados y productos producidos por los mismos
DE102016202476A1 (de) * 2016-02-18 2017-08-24 Heidelberger Druckmaschinen Ag Vorrichtung zum Heißfolienprägen

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JPS5774173A (en) * 1980-10-28 1982-05-10 Canon Inc Color picture recorder
JPS5838177A (ja) * 1981-09-01 1983-03-05 Canon Inc 熱ビ−ム転写印字装置
US4842976A (en) * 1982-01-18 1989-06-27 Mead Corp. Color image-forming process
JPS5989192A (ja) * 1982-11-13 1984-05-23 Kanzaki Paper Mfg Co Ltd 多色記録体
JPS59196294A (ja) * 1983-04-21 1984-11-07 Ricoh Co Ltd 画像形成方法
JPS59227468A (ja) * 1983-06-09 1984-12-20 Tohoku Richo Kk レ−ザ熱転写記録装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486905B2 (en) * 1998-01-06 2002-11-26 Asahi Kogaku Kogyo Kabushiki Kaisha Image-forming substrate and image-forming system using same

Also Published As

Publication number Publication date
WO1988007450A1 (fr) 1988-10-06
DE3871520D1 (de) 1992-07-02
DE3710183A1 (de) 1988-10-13
EP0338025B1 (fr) 1992-05-27
JPH02502708A (ja) 1990-08-30
ATE76609T1 (de) 1992-06-15

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