EP0041099B1 - Ruban pour imprimer sans frappe - Google Patents

Ruban pour imprimer sans frappe Download PDF

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Publication number
EP0041099B1
EP0041099B1 EP19810101361 EP81101361A EP0041099B1 EP 0041099 B1 EP0041099 B1 EP 0041099B1 EP 19810101361 EP19810101361 EP 19810101361 EP 81101361 A EP81101361 A EP 81101361A EP 0041099 B1 EP0041099 B1 EP 0041099B1
Authority
EP
European Patent Office
Prior art keywords
ribbon
resistive
layer
aluminium
impact printing
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
Application number
EP19810101361
Other languages
German (de)
English (en)
Other versions
EP0041099A1 (fr
Inventor
Walter Crooks
Karl John Fowler
William Joseph Weiche
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0041099A1 publication Critical patent/EP0041099A1/fr
Application granted granted Critical
Publication of EP0041099B1 publication Critical patent/EP0041099B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J31/00—Ink ribbons; Renovating or testing ink ribbons
    • B41J31/05—Ink ribbons having coatings other than impression-material coatings

Definitions

  • the present invention relates to a ribbon for non-impact printing. Printing is accomplished with such ribbons by transferring ink from the ribbon to paper by means of localized heating of the ribbon.
  • the heating is obtained by contacting the ribbon with point electrodes and a broad area contact electrode.
  • the high current density in the neighbourhood of the point electrodes during an applied voltage pulse produces intense local heating which causes transfer of dye from the ribbon to a paper in contact with the ribbon.
  • Resistive ribbon printing per se is well known in the prior art. See, for example, U.S. Patent 3,744,611. This patent is typical of the current state of the art and it teaches a resistive ribbon containing three layers: (1) a resistive layer, (2) a conductive layer, and (3) a heat transferrable ink layer.
  • U.S. Patents 3,978,247 and 4,088,442 show operations involving the transfer of dye by sublimation.
  • U.S. Patent 4,032,691 deals with a recording material and shows sublimation of a heat sensitive layer exposed to radiation. None of these patents, however, is in any way concerned with resistive ribbon printing.
  • a resistive ribbon for non-impact printing characterised in that the ribbon includes a resistive substrate layer containing a sublimable dye and an electrically conductive layer of aluminium having a thickness of from 200A to 8000A.
  • the present invention provides a resistive ribbon for non-impact printing containing only two layers instead of the conventional three layers. These layers are the resistive substrate layer in which the sublimable dye is incorporated and the electrically conductive layer of aluminium.
  • the present invention thus results in a greatly simplified ribbon capable of being manufactured more readily than has been the case in the past.
  • the thickness of the aluminium conductive layer is a critical feature of the present invention. In order to provide proper electric conductivity, the aluminium layer should be at least 200A thick. On the other hand, if the aluminium is too thick, the sublimable dye cannot pass through it. The aluminium layer therefore should be no thicker than 8000A. The optimum thickness is about 400A It was an unexpected finding of the present invention that the sublimable dye could successfully pass through an aluminium layer this thick.
  • the present invention is capable of being used with any known resistive substrate.
  • U.S. Patent 4,103,066 describes such a substrate made of polycarbonate resin containing electrically conductive carbon particles. Such a substrate has given very satisfactory results with the present invention.
  • Substrates made of polyester resin containing carbon particles may also be used in ribbons embodying the present invention such substrates may also include in addition to polycarbonate resin and carbon black, a block copolymer of bisphenol A carbonate and dimethyl siloxane.
  • any sublimable dye of choice may be used with the present invention.
  • a preferred example is crystal violet.
  • Other useful dyes include, for example Subla Print Black (L.B. Holliday, Ltd.), Sudan Blue, and Alcian Blue (Registered Trade Marks).
  • the resistive layer should be from about 5 to 25 microns thick, and the sublimable dye should be from about 30% to about 40% by weight.
  • a resistive ribbon was formulated as follows: 8.25 grams of polycarbonate, 3.5 grams of electrically conductive carbon black and 4.0 grams of crystal violet was dispersed in 156 grams of dichloromethane. The dispersion was formed into a coating having a final thickness of 17 microns. It was then coated by vacuum deposition with a layer of aluminium having a thickness of 200A. The ribbon is then mounted on a print robot against paper with a print head consisting of tungsten electrodes engaged against the backside. Very good quality print was obtained at 10 inches (25.4 cm) per second using a current of 50 milliamps. The print had a violet colour.
  • a resistive layer as described above was coated and a layer of aluminium was vacuum deposited to a thickness of 5000A.
  • Print was obtained in the manner described in Example I. The print was violet in colour.
  • a resistive layer was prepared in the manner described in Example I excpet the crystal violet was replaced with Subla Print Black (L.B. Holliday, Ltd.). The layer was coated with a vacuum deposition of aluminium, 200A thick. Print was obtained in the same manner as Example I. Print was black in colour.

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)

Claims (4)

1. Un ruban résistif pour impression sans impact caractérisé en ce qu'il comprend une couche de support résistive contenant un colorant sublimable et une couche électriquement conductrice d'aluminium ayant une épaisseur de l'ordre de 200 A à 8000 A (2 x 10-sm à 80 x 10-8m).
2. Un ruban selon la revendication 1 dans lequel l'épaisseur de la couche conductrice est de l'ordre de 400 A (4x 10-8m).
3. Un ruban selon la revendication 1 ou 2 dans lequel la couche résistive comprend une résine et du carbone conducteur.
4. Un ruban selon l'une quelconque des revendications 1 à 3 dans lequel le colorant sublimable est du violet cristallisé.
EP19810101361 1980-05-30 1981-02-25 Ruban pour imprimer sans frappe Expired EP0041099B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15465880A 1980-05-30 1980-05-30
US154658 1980-05-30

Publications (2)

Publication Number Publication Date
EP0041099A1 EP0041099A1 (fr) 1981-12-09
EP0041099B1 true EP0041099B1 (fr) 1983-11-09

Family

ID=22552216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810101361 Expired EP0041099B1 (fr) 1980-05-30 1981-02-25 Ruban pour imprimer sans frappe

Country Status (4)

Country Link
EP (1) EP0041099B1 (fr)
JP (1) JPS5921791B2 (fr)
CA (1) CA1153550A (fr)
DE (1) DE3161346D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470714A (en) * 1982-03-10 1984-09-11 International Business Machines Corporation Metal-semiconductor resistive ribbon for thermal transfer printing and method for using
US4692044A (en) * 1985-04-30 1987-09-08 International Business Machines Corporation Interface resistance and knee voltage enhancement in resistive ribbon printing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT230910B (de) * 1961-01-11 1964-01-10 Establissement Consulting Farbband

Also Published As

Publication number Publication date
JPS5921791B2 (ja) 1984-05-22
EP0041099A1 (fr) 1981-12-09
JPS5711080A (en) 1982-01-20
DE3161346D1 (en) 1983-12-15
CA1153550A (fr) 1983-09-13

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