EP0129379A2 - Media and method for printing - Google Patents
Media and method for printing Download PDFInfo
- Publication number
- EP0129379A2 EP0129379A2 EP84303892A EP84303892A EP0129379A2 EP 0129379 A2 EP0129379 A2 EP 0129379A2 EP 84303892 A EP84303892 A EP 84303892A EP 84303892 A EP84303892 A EP 84303892A EP 0129379 A2 EP0129379 A2 EP 0129379A2
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- EP
- European Patent Office
- Prior art keywords
- conductive layer
- layer
- heat
- printing
- electrode
- 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.)
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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
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/3825—Electric current carrying heat transfer sheets
Definitions
- the second conductive layer 104 and resistive layer 103 are adjusted to be larger in length resistance than the first conductive layer 102.
- the relation between the resistance values is the same as in the electro-carbon-transfer printing media detailed in the aforesaid Journal of the Institute of Image Electronics Engineers of Japan, Vol. 11, No. 1 Pages 3 to 9 (1982) in which the construction and material for the second conductive layer and resistive layer are also detailed.
- 105 designates an ink layer made of low-melting-point resin mixed with color or black pigment or dye (for example, wax or not- hardening epoxy resin) or of resin mixed with thermal-sublimating dye.
- the heat generated at this time passes through the heat-conductive layer 504 of the second printing medium 507 and raises the tenperature of a part 513 of the ink layer 505.
- the ink layer 505 is formed of heat-molten ink
- the ink is molten by the temperature rise and adheres to the surface of the object to be printed.
- the object 508 and the second printing medium 507 together with the first conductive layer 506 are peeled off and a part 508 of the thermally transfered ink remains on the surface of the object to be printed, thereby completing the printing.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
- Electronic Switches (AREA)
Abstract
Description
- This invention relates to a printing method for printing on an object to be printed patterns or picture images converted into electric signals.
- Conventionally, many methods have been well known which print onto an object to be printed the patterns or picture images converted into electric signals. For example, there has been a method called xerography which converts electric signals to optical signals before printing on paper the patterns or picture images.
- A method called the wire-dot matrix impact printer has also hitherto been used which impacts an ink ribbon by a thin wire to print out paper. Further, a method called the ink-jet which jets drops of liquid ink from a nozzle so as to print the patterns or picture images, that of printing the same on a heat-sensitive paper by use of a thermal head, and that of flowing a current from an electrode pin onto an electro- sensitive paper to break a metallic film and print onto paper the patterns or picture images, have hitherto been used.
- These methods, however, are defective respectively. For example, the xerography method is complicated in imaging to enlarge an apparatus and also need good maintenance. The wire-dot method improves no resolution because of mechanically making one dot so that the printed characters or patterns are not of so good quality and the printing speed is slow. The method of ink-jet causes clogging at a thin nozzle bore and is slow in speed, The method using the heat-sensitive paper is slow in speed. A thermal transfer method for printing on ordinal paper has been proposed which superposes on ordinal paper a sheet coated with heat- melting ink and then heats them by the thermal head for printing, but is defective in the resolution and speed.
- Also, the electro-carbon-transfer method has hitherto been well known (the Journal of the Institute of Image Electronics Engineers of Japan, Vol. 11, No. 1 Pages 3 - 9, 1982), which uses a printing medium comprising a second conductive layer of resin containing copper powder, a resistive layer of resin containing carbon powder, and a first conductive layer of vapor deposition film of aluminum or the like, successively in layers. This printing method is that an electrode is brought into contact with the upper surface of the second conductive layer and voltage is applied between the electrode and the first conductive layer, at which time the applied voltage heats and breaks down the resistive layer and first conductive layer so that a part of carbon powder contained in the resistive layer is adhered to an object to be printed when existing at the first conductive layer side. Such phenomenon occurs in a short time to result in that relatively high speed printing is possible. In other words, the printing was possible at the speed of 100 µs/dot more than ten times the printing speed by use of thermal head, such as heat-sensitive method or thermal transfer method. Also, there has been a method of reducing an amount of carbon on the resistive layer, using not-black conductors, and coating color ink on the first conductive layer, so that,when voltage is applied, both the resistive layer and conductive layer are broken to scatter the color ink to thereby also enable the color image printing. However, in order to obtain the conductivity enough to carry out heat-breakdown, carbon need be mixed to a certain extent and therefore the color ink is mixed with the carbon when broken and scattered, to be a cloudy color.
- An object of the invention is to provide a medium and a method for printing, which eliminate the above conventional defects and enable high speed printing and also color printing.
- A medium for printing according to the invention comprises: a heat-conductive layer having an electrical insulating property; a resistive layer formed on one surface of said heat-conductive layer; a conductive layer formed on said resistive layer; and an ink layer formed on the other surface of said heat-conductive layer.
- By using this printing medium, a method of printing according to the invention comprises the steps of: providing the printing medium; putting said printing medium on an object to be printed so that a surface of said ink layer contacts a surface of said object to be printed; contacting an electrode on a surface of said conductive layer; and applying a voltage between said electrode and said resistive layer so that a current flows through said electrode, said conductive layer and said resistive layer to heat said resistive layer at a position below said electrode to molten said ink layer at a position below said electrode, whereby the molten ink is printed on said object to be printed at a position below said electrode.
- Further, more preferably, a medium for printing according to the invention comprises: a heat-conductive layer having an electrical insulating property; a first conductive layer formed on one surface of said heat-conductive layer; a resistive layer formed on said first conductive layer; a second conductive layer formed on said resistive layer; and an ink layer formed on the other surface of said heat-conductive layer.
- By using this printing medium, a method of printing according to the invention comprises the steps of : providing the printing medium; putting said printing medium on an object to be printed so that a surface of said ink layer contacts a surface of said object to be printed; contacting an electrode on a surface of said second conductive layer; and applying a voltage between said electrode and said first conductive layer so that a current flows through said electrode, said second conductive layer and said first conductive layer to heat said resistive layer at a position below said electrode to molten said ink layer at a position below said electrode, whereby the molten ink is printed on said object to be printed at a position below said electrode.
- A further method of printing according to the invention comprises the steps of: providing a first printing medium having a resistive layer; providing a second printing medium comprising a heat-conductive layer and an ink layer; putting said first printing medium on said second printing medium so that one surface of said first printing medium contacts a surface of said heat-conductive layer;
- putting said second printing medium on an object to be printed so that a surface of said ink layer contacts a surface of said object to be printed; contacting an electrode on the other surface of said first printing medium; and applying a voltage between said electrode and the surface of said first printing medium contacting said heat resistive layer so that a current flows through said electrode and said resistive layer to heat said resistive layer at a position below said electrode to molten said ink layer at a position below said electrode, whereby the molten ink is printed on said object to be printed at a position below said electrode.
- The above and other objects and novel features of the invention will more fully appear from the following detailed description in accordance with the accompanying drawings.
- Fig. 1 is an enlarged sectional view of an embodiment of a medium for printing of the invention,
- Fig. 2 is a schematic view explanatory of the printing method using the medium for printing in Fig. 1,
- Fig. 3 is an enlarged sectional view of a modified embodiment of a medium for printing of the invention,
- Fig. 4 is an enlarged sectional view of another modified embodiment of a medium for printing of the invention,
- Fig. 5 is a schematic view explanatory of a printing method using the medium for printing in Fig. 4,
- Fig. 6 is an enlarged sectional view of a modification of the medium for printing in Fig. 4, and
- Fig. 7 is an enlarged sectional view of another modification of the medium for printing in Fig. 4, different from that in Fig. 6.
- Referring to Fig. 1,
reference numeral 101 designates a heat-conductive layer having anelectrical insulating property, which is a thin plastic sheet of about 5 to 50 µm in thickness, for example, polyester terephthalate or polyvinyl chloride; 102 designates a first conductive layer, which is preferably a metallic vapor-coating film of 500 to 1000 1, such as Al; 103 designates a resistive layer of resin of 1 to 50 µm in thickness and containing conductive powder, the conductive powder being preferably metallic powder or carbon; and 104 designates a second conductive layer which comprises resin of 1 to 50 µm in thickness and contains conductive powder. Theresistive layer 103 is adjusted to be larger in a thickness resistance value than the secondconductive layer 104. The secondconductive layer 104 andresistive layer 103 are adjusted to be larger in length resistance than the firstconductive layer 102. The relation between the resistance values is the same as in the electro-carbon-transfer printing media detailed in the aforesaid Journal of the Institute of Image Electronics Engineers of Japan, Vol. 11, No. 1 Pages 3 to 9 (1982) in which the construction and material for the second conductive layer and resistive layer are also detailed. Also, 105 designates an ink layer made of low-melting-point resin mixed with color or black pigment or dye (for example, wax or not- hardening epoxy resin) or of resin mixed with thermal-sublimating dye. - Next, a printing method using the medium for printing in Fig. 1 will be described in accordance with Fig. 2. The medium for printing, as shown in Fig. 2, is superposed on an object 206 (such as paper) to be printed, an
electrode 207 is press-contacted with a secondconductive layer 204, and voltage from apower source 208 is applied between theelectrode 207 and a firstconductive layer 202. Hence, a current flows in the secondconductive layer 204 as shown by 209 in Fig. 2 to heat theresistive layer 203 in part (a portion 210), whereby anink layer 211 just below theportion 210 is molten by heating through the heat-conductive layer, or the sublimating dye sublimates, to thereby adhere to theobject 206 to be printed. The adhering amount relates to an amount of flowing current or the flowing time thereof. Thereafter, when the medium for printing are removed from the object to be printed, the printing is completed. In this case, the heat-conductive layer 201 prevents the debris of resistive layer caused by energization from adhering to the object to be printed, thereby obtaining distinct dot pattern and color . - In addition, the object to be printed is not defined to the paper as in the above-mentioned embodiment. For example, plastic or metal may apparently be applicable.
- A polyethylene terephthalate sheet of 10 µm in thickness was used as the heat-conductive layer, on one main surface of which was formed an aluminum 0 vapor coating film of 600 A as the first conductive layer. The surface resistance of the aluminum vapor coating film was 7 to 10 Ω/sq.
-
-
- Next, the composition of:
- Polyvinyl chloride acetate copolymer:was formed as the low-melting-point resin ink layer of 5 pm in thickness on the other main surface of heat-conductive layer. Thus a medium for printing which is a laminated object in five layers of 45 µm in thickness as a whole was obtained.
- The thus obtained medium for printing was superposed on a sheet of ordinary paper and set up as shown in Fig. 2 and was applied with a voltage of 100 V for 0.1 msec.
- As the result,
- distinct black dots were printed on the paper.
-
- The thus obtained medium for printing was set up on a sheet of ordinary paper as shown in Fig. 2 and was applied with a voltage of 100 V for 0.1 msec. As the result a dot of clean cyanic color was printed on the paper.
- In the above examples, butyral resin was used as the binder of the second conductive layer or resistive layer, but the binder is not limited to butyral resin. For example, polyvinyl chloride, polyethylene, polyurethane, ethylene-vinyl acetate copolymer, polystyrene, polypropylene, or polyvinyl acetal, may be usable as the binder. Also, as the conductive powder added to the second conductive layer and resistive layer, powder of zinc oxide tin oxide, aluminum, tin, gold or silver may be used. Also, the following sublimating dyes may be used, for example, so as to obtain the three primary colors. Yellow
-
- In addition, in the above example examples, the object to be printed was paper or the like, but other materials may be used. For example, when the distinct printing is intended to be obtained by use of sublimating dye, the object to be printed is preferably not-ordinary paper but paper or plastic sheet coated on the surface with a developer. These include a plastic sheet coated on the surface of which is coated, for example, Japanese acid clay, fine grain powder of silica, or fine grain powder of 2-acrylamide-2-methylpropane sulfonic acid or the like, through polyvinyl alcohol, casein, polyester, styrenebutadiene copolymer, and the like or the same coated or laminated only with a resin layer of polyester or poly-2-acrylamide-2-methyl propane sulfonic acid or the like.
- Referring to Fig. 3,
reference numeral 301 designates a heat-conductive layer having an electrical insulating property, which is a thin plastic sheet of about 5 to 50 µmin thickness. For example, polyester terephthalate or vinyl chloride is usable as the heat-conductive layer.Reference numeral 302 designates a resistive layer of resin of about 1 to 50 µm in thickness, containing conductive powder which is preferably metallic powder or carbon.Reference numeral 303 designates a conductive layer of resin of 1 to 50 µm in thickness, containing conductive powder in the same way as theresistive layer 103 in Fig. 1. Theresistive layer 302 is adjusted to be larger in a thicknesswise resistance value than theconductive layer 303. This construction is equivalent to that obtained by omitting the first conductive layer from the medium for printing comprising five layers as shown in Fig. 1, theresistive layer 302 being used also as the first conductive layer in Fig. 1.Reference numeral 304 designates an ink layer the same as in the medium for printing in Fig. 1. - Since the printing method using the medium in Fig. 3 is quite the same as that using the medium in Fig. 1, its explanation is omitted here.
-
-
- Next, on the other main surface of the heat-conductive layer, the composition of:
-
- The thus obtained medium for printing was set up on a sheet of ordinary paper as shown in Fig. 2, and applied with a voltage of 200 V for 100 p sec. As the result, a distinct black dot was printed or the paper.
- Next, explanation will be given on another modified embodiment of a medium for printing and printing method of the invention. Referring to Fig. 4, this medium for printing comprises two separate sheets which are equivalent to those obtained by dividing the media for printing in Fig. 1 into the heat-
conductive layer 101 and firstconductive layer 102 at the boundary - therebetween. Such a construction is easy to be applied with a voltage because the first conductive layer is exposed to the exterior. A
first printing medium 406 comprises a firstconductive layer 401, aresistive layer 402, and asecond cnductive layer 403, the respective layers being the same as the firstconductive layer 102,resistive layer 103 and secondconductive layer 104 in Fig. 1, where, in this case, these three layers form one sheet. Asecond printing medium 407 ; comprises a heat-conductive layer 404 serving also as a support, and an ink layer 405, the heat-conductive layer 404 being preferably a thin plastic sheet of about 5 to 50 µm thick, for example, polyethylene terephthalate or polyvinyl chloride. The ink layer 405 coated on thelayer 404 is made of low-melting-point resin (e.g. wax or not- hardening epoxy resin) mixed with color or black pigment or dye or resin mixed with sublimating dye. - Now, explanation will be given on the printing method using the medium for printing of Fig. 4 with reference to Fig. 5. In Fig. 5, the surface of the second
conductive layer 501 of thefirst printing medium 506 is superposed on the surface of the heat-conductive layer 504 of thesecond printing medium 507,and further the surface of theink layer 505 of thesecond printing medium 507 is superposed on anobject 508 te.g. paper or the like) to be printed. In other words, the first printing medium 506 is superposed on the second printing medium 507, and the second printing medium is superposed on theobject 508 to be printed. Anelectrode 509 is brought into contact with the secondconductive layer 503 of the first printing medium, and agrounding roller 510 is brought into contact with the firstconductive layer 501 of thefirst printing medium 506. A voltage from apower source 511 is applied between theelectrode 509 and the groundingroller 510 so that a current flows therebetween. The current heats or sometimes breaks apart 512 of theresistive layer 502 just below theelectrode 509' - The heat generated at this time passes through the heat-
conductive layer 504 of thesecond printing medium 507 and raises the tenperature of apart 513 of theink layer 505. In a case where theink layer 505 is formed of heat-molten ink, the ink is molten by the temperature rise and adheres to the surface of the object to be printed. Thereafter, theobject 508 and thesecond printing medium 507 together with the firstconductive layer 506 are peeled off and apart 508 of the thermally transfered ink remains on the surface of the object to be printed, thereby completing the printing. In this case, debris of the resistive layer caused by energization is prevented from adhering to the object to be printed, so that a distinct dot formation and color can be obtained. Since the firstconductive layer 501 of the first medium for printing is exposed, the electrical connection of low contact resistance can be obtained ty a simple grounding roller or the like. This eliminates the problem of heating at the portion of the grounding roller in comparation with the conventional grounding method of using a grounding roller having a contact area larger than that of an electrode at the same side as the electrode 509 (on the surface of the second conductive layer with the surface of second conductive layer). - Incidentally, in the aforesaid description, the first medium for printing is of three layers, but other constructions are possible. Fig. 6 shows a modified construction of the first medium for printing in Fig. 4.
Reference numeral 601 designates a resistive layer, and 602 designates a conductive layer. Inother words, the first conductive layer is omitted from the first medium for printing in Fig. 4. The printing method using the medium for printing of Fig. 6 is the same as shown in Fig. 5. - Fig. 7 shows another modified construction of the first medium for printing.
Reference numeral 701 designates a first conductive layer, 702 designates a resistive layer, 703 designates a second conductive layer, and 704 designates a protective layer. In other words, theprotective layer 704 is provided on the surface of the first conductive layer of the first medium for printing in Fig. 4. Theprotective layer 704 is preferably a resin film to thereby prevent the first conductive layer from corroding due to humidity or the like. - On a glass substrate, the composition of:
- Next, on a polyethylene terephthalate sheet of 9 µm thick, the conposition of:
- Polyvinyl chloride acetate copolymer:were coated to be of 5 µm in film thickness, to obtain a second medium for printing.
- The first and second media for printing and a sheet of ordinary paper were set up as shown in Fig. 5 and a voltage of 100 V was applied to the first medium for 200 p sec. As the result, a distinct black dot was printed on the paper.
- Onto a polyethylene terephthalate sheet of 9 µm thick, the composition of:
- Sublimating dye (magenta)
- This second medium for printing and the first medium for printing obtained in the Example 4 were set up as shown in Fig. 2 and a voltage of 70 V was applied to the first medium for 1 msec. As the result, a clean magenta dot was printed on the paper.
- Onto a glass substrate, the composition of:
- The thus obtained first medium for printing and the second medium for printing obtained in the example 4 were set up cn a sheet of ordinary paper as shown in Fig. 5 and a voltage of 200 V was applied to the first medium for 100 p sec. As the result, a distinct dot was printed on the ordinary paper.
- Although several embodiments have been described, they are merely exemplary of the invention and not limit the scope of the invention. It should be understood that various changes and modifications are made without departing from the scope of the invention which is defined solely by the appended claims.
Claims (20)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP103690/83 | 1983-06-09 | ||
JP58103689A JPS59227491A (en) | 1983-06-09 | 1983-06-09 | Recording method |
JP58103690A JPS59227492A (en) | 1983-06-09 | 1983-06-09 | Electrifying transfer recording medium |
JP103689/83 | 1983-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0129379A2 true EP0129379A2 (en) | 1984-12-27 |
EP0129379A3 EP0129379A3 (en) | 1987-02-25 |
Family
ID=26444296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84303892A Withdrawn EP0129379A3 (en) | 1983-06-09 | 1984-06-08 | Media and method for printing |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0129379A3 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2713822A (en) * | 1948-12-20 | 1955-07-26 | Columbia Ribbon & Carbon | Planographic printing |
US3744611A (en) * | 1970-01-09 | 1973-07-10 | Olivetti & Co Spa | Electro-thermic printing device |
US4195937A (en) * | 1977-09-19 | 1980-04-01 | Termcom, Inc. | Electroresistive printing apparatus |
US4309117A (en) * | 1979-12-26 | 1982-01-05 | International Business Machines Corporation | Ribbon configuration for resistive ribbon thermal transfer printing |
EP0042950A2 (en) * | 1980-06-30 | 1982-01-06 | International Business Machines Corporation | Current collector for resistive ribbon printers |
EP0059308A2 (en) * | 1981-03-02 | 1982-09-08 | International Business Machines Corporation | A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon |
-
1984
- 1984-06-08 EP EP84303892A patent/EP0129379A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2713822A (en) * | 1948-12-20 | 1955-07-26 | Columbia Ribbon & Carbon | Planographic printing |
US3744611A (en) * | 1970-01-09 | 1973-07-10 | Olivetti & Co Spa | Electro-thermic printing device |
US4195937A (en) * | 1977-09-19 | 1980-04-01 | Termcom, Inc. | Electroresistive printing apparatus |
US4309117A (en) * | 1979-12-26 | 1982-01-05 | International Business Machines Corporation | Ribbon configuration for resistive ribbon thermal transfer printing |
EP0042950A2 (en) * | 1980-06-30 | 1982-01-06 | International Business Machines Corporation | Current collector for resistive ribbon printers |
EP0059308A2 (en) * | 1981-03-02 | 1982-09-08 | International Business Machines Corporation | A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon |
Also Published As
Publication number | Publication date |
---|---|
EP0129379A3 (en) | 1987-02-25 |
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Inventor name: NISHIMURA, YUTAKA Inventor name: SIMIZU, RYOTA Inventor name: TSUKAMOTO, MASAHIDE Inventor name: KATAKABE, NOBORU |