JP2974687B2 - Composite recording media - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, and more particularly to a composite recording medium capable of multilayer recording having a magnetic recording layer and a resistance heating type (electric heating) recording layer.

[Background of the Invention]

A magnetic recording medium having a magnetic recording layer provided on the surface of a base such as plastic is widely used as a credit card, a cash card, an IC card, a ticket, a commuter pass, a magnetic tape, and the like. Such a magnetic recording medium,
It has the advantage that its recording density is high and it is not easy to read out recorded information from the outside.However, since recorded information is inevitably invisible, it is necessary to record visible information on these recording media. May occur. In such a case, characters, designs, and the like have been printed on a margin or the back surface of the base surface of the magnetic recording medium. However, since the magnetic recording medium is generally small in size, necessary characters are printed. There is a shortage of space for printing visible information, such as the fact that a sufficient amount of information cannot be printed.

For this reason, characters and characters are also placed on the magnetic recording layer of the magnetic recording medium.
In recent years, a magnetic recording medium in which visible information such as a pattern is formed by a printing unit has recently appeared. However, since the visible information is formed by ordinary printing means,
The contents were uniform and fixed, and there was a drawback that there was little change. In addition, printing individual information such as barcodes, OCR characters, names, and expiration dates on the magnetic recording layer according to individual circumstances leads to an increase in manufacturing costs, which is not feasible. Further, since the printing ink of 2 to 5 microns is provided on the magnetic recording, the distance between the magnetic recording layer and the magnetic head becomes large, and the magnetic output of that portion is lower than that of the non-printed portion, and the output fluctuation is reduced. The problem that it becomes large arises.

In recent years, forgery and falsification of magnetic recording media such as cash cards, credit cards, commuter passes and the like have become a major social problem, and much research has been conducted on how to prevent forgery and falsification of magnetic recording information. However, at present, a simple and effective method for preventing forgery or falsification of magnetic recording information has not been found yet.

In view of the above situation, the present inventors have already proposed a thermosensitive magnetic recording medium in which a magnetic recording layer and a thermosensitive recording layer are combined (Japanese Patent Application No. 59-199284). This recording medium is
A heat-sensitive recording layer made of a non-magnetic thin film is further provided on the magnetic recording layer so that visible information can be recorded on the thin-film heat-sensitive recording layer by heating and printing means such as a thermal head together with magnetic information recording. By the way, when such a recording medium is used for, for example, a stored fair card (for example, for station service), a protective layer is provided on the surface of the heat-sensitive recording layer in order to improve physical durability such as gade suitability. Is always required for practical use. In the case of the recording medium as described above, the heat-sensitive recording layer is formed of a thin film of a low melting point metal such as Al or Sn so as to withstand a temperature of about 120 ° C.

However, in the thermosensitive magnetic recording medium having the above-described structure, when recording visible information using a thermal head, a relatively large amount of heat is required to be applied for printing, so that printing speed is severely limited. Problem. Further, the application of such a high heat quantity also leads to a problem of shortening the life of the thermal head.
On the other hand, in order to increase the printing speed, it is conceivable to reduce the thickness of the protective layer as much as possible. However, reducing the thickness of the protective layer means that the durability is correspondingly reduced, which causes a problem in practicality. On the other hand, it is also conceivable to lower the heat-sensitive temperature range of the heat-sensitive recording layer itself. However, in this case, on the contrary, the storage stability decreases, and deterioration and discoloration occur as the storage temperature increases, and the durability also decreases. There is. As described above, in the conventional recording medium, the printing sensitivity and the durability are mutually contradictory, and at present, no one satisfying both of them has been obtained.

The present invention is intended to solve the problems associated with the conventional techniques described above, and the present invention has the following objects.

a) To provide a composite recording medium having different qualities including both magnetic information and visible information and capable of recording a large amount of information.

b) To provide a composite recording medium having excellent durability and capable of high-speed printing and high-speed recording.

c) To provide a composite recording medium in which individual visible information according to each situation can be easily recorded.

d) To provide a recording medium in which forgery or falsification of magnetic information cannot be easily performed.

e) To provide a recording medium which can double-check magnetic information and visible information and which is difficult to forge and alter.

f) To provide a recording medium with a small decrease in magnetic output due to a visible recording portion provided on a magnetic recording layer.

[Summary of the Invention]

In the composite recording medium according to the present invention, a magnetic recording layer is provided on a substrate, and a heat-sensitive recording layer composed of a non-magnetic thin film and a protective layer composed of a resistance heating material are formed in this order on the surface of the magnetic recording layer. It is characterized by being done.

In the composite recording medium of the present invention, magnetic information can be recorded on the magnetic recording layer in the medium by ordinary magnetic information recording means, and visible information can be recorded on the heat-sensitive recording layer. Recording of information on the heat-sensitive recording layer is performed by applying a current according to print information from the electrode head by bringing the electrode head into contact with a protective layer made of a resistance heating material provided on the surface of the heat-sensitive recording layer. This is performed by destroying the non-magnetic thin film (thermosensitive recording layer) by the heat generated according to the print information.

In the composite recording medium of the present invention, if necessary, a coloring layer or a concealing layer for concealing the color of the magnetic recording layer may be provided between the nonmagnetic thin film (thermal recording layer) and the magnetic recording layer. In some cases, an adhesive layer for increasing the adhesive force between the layers to prevent peeling between the layers may be provided.

[Specific description of the invention]

Hereinafter, the present invention will be described based on specific examples shown in the drawings.

As shown in FIG. 1, a composite recording medium 1 according to the present invention basically includes a sheet-shaped or plate-shaped substrate 2, a magnetic recording layer 3 provided thereon, It comprises a heat-sensitive recording layer 4 made of a non-magnetic thin film and a protective layer 5 made of a resistance heat-generating material provided thereon.
The protective layer desirably has good light transmittance, but need not be completely transparent.

The magnetic recording layer 3 is provided entirely or partially on the surface of the base 2. The heat-sensitive recording layer 4 is provided entirely or partially on the surface of the magnetic recording layer 3.
In some cases, as shown in FIG. 2, the heat-sensitive recording layer 4 may be provided on the surface of the base 2 over a wider area than the magnetic recording layer 3.

2 shows another specific example of the composite recording medium 1 according to the present invention.

The composite recording medium 1 shown in FIG. 3 has a magnetic recording layer 3, a coloring layer 6, a heat-sensitive recording layer 4, and a protective layer 5 laminated on a base 2 in this order. The layer 6 has a function of giving a contrast to the visible information recorded on the thermosensitive recording layer 4. In this case, the colored layer 6 may have a function as a concealing layer for concealing the color of the magnetic recording layer 4. Further, in the above case, if a concealing layer (not shown) for concealing the color of the magnetic recording layer 4 is separately provided between the coloring layer 6 and the magnetic recording layer 3, the effect of the coloring layer is further enhanced.

In the composite recording medium 1 shown in FIG. 4, a magnetic recording layer 3 and a thermosensitive recording layer 4 are laminated on a base 2 in this order, and between the magnetic recording layer 3 and the thermosensitive recording layer 4. An adhesive layer 7 is provided. The adhesive layer 7 not only functions to strengthen the adhesiveness between the magnetic recording layer 3 and the heat-sensitive recording layer 4 and prevents the two layers from peeling off, but also enhances the heat insulating effect of the adhesive layer to minimize the adhesive layer. The heat-sensitive recording layer can be destroyed with a minimum amount of heat, and the sensitivity can be increased. Also, the colored layer of FIG. 3 has the same effect by selecting a material.

In the composite recording medium 1 shown in FIG. 5, a magnetic recording layer 3, a heat-sensitive recording layer 4, and a protective layer 5 are laminated in this order on both front and back surfaces of a base 2, respectively. Many records can be recorded.

Hereinafter, the method for producing the composite recording medium according to the present invention and the materials used will be described.

The composite recording medium 1 according to the present invention is
The magnetic recording layer 3, the heat-sensitive recording layer 4, the protective layer 5, and if necessary, the colored layer 6 or the adhesive layer 7 can be formed by a printing method, a coating method, a vapor deposition method, or the like.

Also, as shown in FIG. 6, once on the transfer substrate 8,
A transfer laminate 11 in which a protective layer 5, a heat-sensitive recording layer 4, a magnetic recording layer 3, and a hot-melt adhesive layer 10 are laminated in this order via a release layer 9 is prepared, and the hot-melt adhesive of the laminate 11 is prepared. The recording medium 1 according to the present invention can be formed by a transfer method in which the layer 10 is adhered to the surface of the base 2 and the transfer base 8 is removed by the release layer 9.

Further, as shown in FIG. 7, a sticking laminate 13 in which the magnetic recording layer 3, the heat-sensitive recording layer 4, and the protective layer 5 are temporarily laminated on the sticking substrate 12, is prepared. An adhesive layer 14 is provided on the back surface, and the base 2 and the adhered substrate 12 are integrally adhered to each other through the adhesive layer 14 by an attaching method.
The recording medium 1 according to the present invention can also be formed.

The substrate 2 has a sheet shape or a plate shape, and the substrate 2 is made of nylon, cellulose diacetate,
Plastics such as cellulose triacetate, polythrylene, polyethylene, polypropylene, polyester, polyimide, and polycarbonate, metals such as copper and aluminum, paper, impregnated paper, and the like can be used alone or in combination as composites. A preferable material may be appropriately selected from the above materials in consideration of physical properties required for the base material, such as strength, rigidity, concealing property, and light opacity. The thickness of the substrate 2 is about 0.005 to 5 mm.

The magnetic recording layer 3 is made of γ-Fe ₂ O ₃ , Co-coated γ-Fe ₂ O ₃ , Fe ₃ O
_{4, CrO 2, Fe, Fe} -Cr, Fe-Co, Co-Cr, Co-Ni, MnA
l, Ba ferrite, Sr ferrite and other known magnetic fine particles are dispersed in a suitable resin or ink vehicle, and a dispersion is prepared by a conventionally known coating method such as a gravure method, a roll method, or a knife edge method. 2 can be formed. The magnetic recording layer 3 is made of Fe, Fe-C
A metal or alloy such as r, Fe-Co, Co-Cr, or a compound thereof can be formed on the substrate 2 by a vacuum deposition method, a sputtering method, a plating method, or the like.

When the magnetic recording layer 3 is formed by a coating method,
Its film thickness is about 1 to 100 microns, preferably about 5 to 20 microns. When the magnetic recording layer 3 is formed by a vacuum evaporation method, a sputtering method, or a plating method, the film thickness is 10
It is about 0 to 1 micron, preferably about 500 to 2000.

Resins or ink vehicles in which magnetic fine particles such as γ-Fe ₂ O ₃ are dispersed include butyral resin, vinyl chloride / vinyl acetate copolymer resin, urethane resin, polyester resin, cellulose resin, acrylic resin, styrene / maleic An acid copolymer resin or the like is used, and if necessary, a rubber-based resin such as nitrile comb or a urethane elastomer is added. Further, in the dispersion obtained by dispersing the magnetic fine particles in the resin, a surfactant, a silane coupling agent, a plasticizer, wax, silicone oil, carbon, and other pigments can be added as necessary. .

The heat-sensitive recording layer 4 is made of a metal such as Te, Sn, In, Al, Bi, Pb, Zn, or an alloy thereof, or a compound of the above-mentioned metal such as Te-carbide, by a vacuum deposition method, a sputtering method, a plating method, or the like. It can be formed on the recording layer.
The heat-sensitive recording layer 4 made of a non-magnetic thin film plays a role as a heat-sensitive recording layer for receiving and recording heat generated in the protective layer 5, and is therefore preferably a material having a low melting point. The film thickness of such a non-magnetic thin film is about 100 to 1 micron (μm), preferably about 500 to 1000 °.

The protective layer 5 is made of a resistive heat-generating material that can generate heat when energized. This resistance heating material has a surface resistance
It preferably has physical properties of 10 ^-2 to 10 ⁷ Ω / □.
Further preferred are those surface resistance 10~10 ³ Ω / □ of the. Such a resistance heating material can be composed of a composition obtained by mixing a predetermined amount of a conductive substance with a resin.
As shown in FIG. 8, the protective layer 5 is also formed by temporarily applying an insulating resin layer 5a and then attaching a conductive material layer 5b to the surface thereof by a vapor deposition method, a sputtering method, or the like. can do.

As the resin used for the composition for the protective layer, ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, cellulose derivatives such as cellulose acetate, polystyrene, styrene resin such as poly-α-methylstyrene or styrene copolymer resin,
Acrylic or methacrylic resin such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, polybutyl acrylate, etc. alone or copolymerized resin, rosin, rosin-modified maleic resin, rosin-modified phenolic resin, polymerized rosin, etc. Rosin ester resin,
Polyvinyl acetate resin, coumarone resin, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin, butyral resin, and the like can be used.

On the other hand, examples of the conductive material include tin oxide, indium oxide, tin-indium oxide, antimony-titanium oxide, antimony-indium oxide, and the surface of pigment particles such as titanium oxide and barium sulfate. The surface-treated with the above-mentioned conductive substance, a conductive polymer containing a complex or the like, various conductive surfactants, and the like can be used.

The mixing ratio of the resin and the conductive material can be appropriately adjusted so that the composition falls in the range of the physical properties described above. Further, in the present invention, the above-described conductive substance can be directly deposited on the heat-sensitive recording layer by a vapor deposition method, a sputtering method, a CVD method, or the like to form a protective layer. It can also be manufactured by providing an insulating resin layer once on the recording layer and further attaching the conductive substance thereon by a vapor deposition method, a sputtering method or the like. The conductive material layer thus formed is particularly excellent in durability in terms of chemical resistance and the like.

The thickness of the protective layer is not particularly limited, but may be 0.
The range of 05 to 15μ is preferred.

Also, the surface lubricity can be improved by adding silicone or the like to the protective layer.

Colored layer 6 is a cellulose derivative such as ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, cellulose acetate, polystyrene, a styrene resin such as poly-α-methylstyrene or a styrene copolymer resin, polymethyl methacrylate,
Acrylic or methacrylic resins such as polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate, alone or copolymerized resins, rosin, rosin-modified maleic resin, rosin-modified phenolic resin, rosin ester resin such as polymerized rosin, poly Various pigments are added to binders such as vinyl acetate resin, coumarone resin, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin, and butyral resin according to the color to be colored, and, if necessary, a plasticizer. , Stabilizer, wax, grease, desiccant, drying aid, curing agent, thickener,
After adding the dispersant, using a colored coating or ink sufficiently kneaded with a solvent or a diluent, using a coating method or a printing method such as a normal gravure method, a roll method, a knife edge method, an offset method, and the like, Can be formed in parts.

The adhesive layer 7 is made of vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, vinyl chloride / propionic acid copolymer, rubber resin, cyanoacrylate resin, cellulose resin, ionomer resin, polyolefin copolymer. To the binder such as coalescence, if necessary, after adding a plasticizer, a stabilizer, a curing agent, and the like, using a coating for an adhesive layer that is sufficiently kneaded with a solvent or a diluent, a gravure method, a roll method, It can be formed on a desired portion on the substrate by a coating method such as a knife edge method. In particular, when an adhesive layer is provided on the magnetic recording layer, it is preferable that the thermoplastic resin be emulsified and applied and dried to form a heat-sealable adhesive layer in order to prevent re-dissolution of the magnetic recording layer. .

Magnetic information is obtained by a normal method such as a magnetic head.
It is recorded in the magnetic recording layer 3.

On the other hand, visible information such as a barcode, OCR characters, name, and expiration date is recorded on the thermal recording layer 4. The recording on the heat-sensitive recording layer 4 is performed by applying an AC or DC voltage to the protective layer 5 by an energizing means such as an electrode array, and by applying heat to the protective layer and the non-magnetic thin film layer 4 to generate heat. This is performed by selectively destroying the layer 4 according to the printing information. Therefore, in the present invention,
The amount of heat generated can be easily adjusted by changing the applied voltage without using a heating printing means such as a thermal head as the printing means. In the thermal head, when the applied voltage is increased to cause a current to flow through the resistance heating element provided between the electrodes to generate heat, the heating element is destroyed by an overcurrent, and thereafter printing becomes impossible. However, in the present invention, even if the voltage applied from the printing electrode is increased, the electrode is not destroyed, and high heat can be generated instantaneously. It can be dramatically higher.

Further, in the composite recording material of the present invention, since the resistance heating action can be increased as the thickness of the protective layer is increased, this is advantageous in further improving the durability. Furthermore, in the present invention, as described above, the voltage applied from the printing electrode can be relatively easily increased, and high heat can be generated instantaneously. Therefore, it is possible to improve the durability without lowering the printing speed.

In general, in the case of conventionally known discharge breakdown recording, the voltage application portion of the protective layer is often destroyed, but the protective layer may be formed of a material that remains without being destroyed even after printing. In the present invention, such an embodiment is also included in the scope of the present invention.

When the magnetic information and the visible information are recorded as described above, the recording may be performed in the order of the visible information and then the magnetic information, or the magnetic information and the visible information may be recorded in the order of the visible information. However, since the printing section generates heat when recording the visible information, if the temperature of the magnetic recording layer may become higher than the Curie temperature when recording the visible information, first record the visible information and then record the magnetic information. Is preferred.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples. In the following examples, all “parts” are by weight unless otherwise specified.

Example 1A On a polyethylene terephthalate sheet having a thickness of 188 microns, a magnetic paint having the following composition was applied by a gravure coating method to form a magnetic recording layer having a thickness of 10 microns. Next, tin was vapor-deposited thereon by a vacuum vapor deposition method to a thickness of 1000 ° as measured by a film thickness measurement method using a quartz oscillator to form a non-magnetic thin film layer as a heat-sensitive recording layer. Next, a coating material for forming a protective layer having the following composition was applied by a gravure coating method to form a protective layer having a thickness of 5 μm, thereby obtaining a composite recording medium of the present invention.

Composition of magnetic paint: Co-coated γ-Fe ₂ O ₃ (“X-6000” manufactured by Titanium Industry Co., Ltd.) 75 parts partially saponified vinyl chloride / vinyl acetate copolymer resin 10 parts (“VINYLITE VAGH” manufactured by Union Carbide) Polyurethane terrestomer resin 10 parts (Sanprene IB114B manufactured by Sanyo Chemical Industries) Cotton-like saturated polyester resin (Toyobo's Byron RV
53SS ") 5 parts Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts Toluene 50 parts Isocyanate-based curing agent" AT Mitech "manufactured by Mitsubishi Chemical Corporation
NY-220A ") 3 parts Protective layer paint composition: Polyvinyl butyral resin 3 parts (Sekisui Chemical Co., Ltd." ESLEC BX ") Moisture-curable urethane resin 3 parts (Mitsui Toatsu Co., Ltd." Olester M95-50A "methyl ethyl ketone 30 parts Toluene 30 parts Ethyl acetate 30 parts Conductive pigment 6 parts (tin indium oxide) Example 1B After forming a magnetic recording layer and a non-magnetic thin film layer on a polyethylene terephthalate sheet in the same manner as in Example 1, protection of the following composition was carried out. The coating for the layer was applied to a thickness of 5 μm by a gravure coating method and dried, and then a thin film of tin indium oxide was deposited thereon by a vacuum deposition method at 1000 ° to form a conductive protective layer of the embodiment shown in FIG.

Composition of protective layer paint: Polyvinyl butyral resin 3 parts (Sekisui Chemical Co., Ltd. "ESLEC BX") Moisture-curable urethane resin 3 parts (Mitsui Toatsu Co., Ltd. "Olester M95-50A" Methyl ethyl ketone 30 parts Toluene 30 parts Ethyl acetate 30 parts Conductive pigment 6 parts (tin indium oxide) Example 2 After forming a magnetic recording layer and a non-magnetic thin film layer on a polyethylene terephthalate sheet in the same manner as in Example 1A,
Using a colored paint having the following composition, a transparent colored protective layer having a thickness of 3 μm was formed by a gravure coating method. Further, a conductive thin film was formed thereon in the same manner as in Example 1A.

Composition of paint for transparent colored protective layer: Partially saponified vinyl chloride / vinyl acetate copolymer resin 20 parts (Vinylite VAGH manufactured by Union Carbide) Coating material 3 parts Isocyanate-based curing agent 3 parts (Takeda Chemical Co., Ltd. D110N ") 30 parts of methyl ethyl ketone 30 parts of toluene Example 3 A magnetic recording layer was formed on a polyethylene terephthalate sheet in the same manner as in Example 1A, and a film was formed by a gravure coating method using the same colored paint as used in Example 2. A colored layer having a thickness of 3 microns was formed. In the case of this example, the pigment does not need to be a transparent pigment, but rather has higher opacity in order to hide the color of the magnetic layer. Therefore, in the case of this example, the amount of the pigment is increased to about 10 parts. Then, tin was applied thereon by vacuum evaporation.
A nonmagnetic thin film layer as a heat-sensitive recording layer was formed by vapor deposition to a thickness of 00 °. Further, a conductive protective layer was formed thereon.

Example 4 After forming a magnetic recording layer and a non-magnetic thin film layer on a polyethylene terephthalate sheet in the same manner as in Example 1A,
Using a coating for a protective layer having the following composition, a protective layer having a thickness of 1 micron was formed by a gravure coating method.

Composition of protective layer paint: Polyvinyl butyral resin 3 parts (Sekisui Chemical Co., Ltd. "ESLEC BX") Moisture-curable urethane resin 3 parts (Mitsui Toatsu Co., Ltd. "Olester M95-50A" Methyl ethyl ketone 30 parts Toluene 30 parts Ethyl acetate 30 parts Conductive pigment 6 parts (tin indium oxide) Example 5 In the same manner as in Example 1A, after forming a magnetic recording layer on a polyethylene terephthalate sheet, using a coating for an adhesive layer having the following composition, a gravure coating method was used. A first adhesive layer having a thickness of 0.5 micron was formed, and then tin was deposited thereon to a thickness of 1000 mm by a vacuum deposition method to form a non-magnetic thin film layer as a heat-sensitive recording layer. A protective layer was formed.

Composition of paint for adhesive layer: 10 parts of vinyl chloride / vinyl acetate copolymer resin (“Vinylol K-2” manufactured by Kogaku Kagaku) 1 part of isocyanate curing agent (“Takenate D110N” manufactured by Takeda Pharmaceutical Co., Ltd.) Ethyl acetate 200 Example 6 First, a thermal transfer tape having a width of 6.5 mm for forming a magnetic recording layer and a non-magnetic thin film layer on a substrate was produced as follows.

(A) A release layer having a thickness of 1 micron was formed on a 25 micron thick polyethylene terephthalate sheet by a gravure coating method using a paint for a release layer having the following composition.

Composition of paint for release layer: Cellulose acetate resin (Dainippon Celluloid) 5 parts Methylol melamine thermosetting resin (Nippon Carbide) 1 part Methyl ethyl ketone 50 parts Methyl alcohol 25 parts Toluene 25 parts (b) Example 1A Using the same protective layer paint as used in
A protective layer having a thickness of 3 μm was formed on the release layer by a gravure coating method.

(C) A non-magnetic thin film was formed by providing a 1000-nm-thick tin layer on the protective layer by vacuum evaporation.

(D) using the same paint for the adhesive layer as used in Example 5,
An adhesive layer having a thickness of 0.5 μm was formed on the nonmagnetic thin film by a gravure coating method.

(E) Using the same magnetic paint as used in Example 1A, a magnetic recording layer having a thickness of 10 μm was formed on the adhesive layer by a gravure coating method.

(F) Using a hot melt adhesive layer paint having the following composition,
A hot-melt adhesive layer having a thickness of 10 μm was formed on the magnetic recording layer by a gravure coating method.

Composition of paint for hot melt adhesive layer: 1 part of vinyl chloride / vinyl acetate copolymer resin (“DENKARAC 721” manufactured by Denki Kagaku) acrylic resin 2 parts toluene 8 parts ethyl acetate 8 parts The transfer tape was thermally transferred onto a vinyl chloride base material, and was 86 mm long, 54 mm wide and 0.8 m thick.
m cards manufactured.

Example 7 A bar code, an OCR character, a Chinese character, a Roman character, etc. were printed on the recording medium manufactured according to Examples 1 to 6 by applying a voltage having an applied energy density of 30 mJ / mm ² by an electrode head. A desired pattern was formed on the medium. Barcodes and OCR characters were clear enough to be read by a machine.

Next, when the magnetic recording was performed on the printed recording medium by a magnetic head, the influence of the printing on the reproduction output was within a range where there was no practical problem.

〔The invention's effect〕

The composite recording medium according to the present invention has the following effects because it has a magnetic recording layer, a heat-sensitive recording layer composed of a non-magnetic thin film, and a protective layer composed of a resistive heat-generating material.

a) Both magnetic information and visible information can be recorded on a recording medium, and a large amount of information can be recorded.

b) In addition to magnetic information, individual visual information according to individual circumstances can be easily recorded.

c) Since the protective layer is made of a resistive heat-generating material, high-speed printing by the energizing printing means is possible, and the durability is improved.

d) Since the heat-sensitive recording layer composed of the non-magnetic thin film layer is integrally provided on the magnetic recording layer, it is more difficult to forge and falsify the recording medium as compared with a recording medium having only a magnetic recording layer. It is.

e) Magnetic information and barcode, OCR
Since visible information such as characters can be recorded, a double check of a magnetic check and a mechanical read check can be performed, which also makes it difficult to forge or alter the recording medium.

f) The thickness of the non-magnetic thin film layer, which is a visible information recording portion provided on the magnetic recording layer, is smaller than that of the visible information recording portion provided by the printing means. And the output fluctuation of the reproduction output is small.

[Brief description of the drawings]

1 to 5 and 8 are cross-sectional views of the composite recording medium according to the present invention, and FIGS. 6 and 7 are transfer images used for manufacturing the composite recording medium according to the present invention. It is sectional drawing of a laminated body. 1 ... recording medium, 2 ... base, 3 ... magnetic recording layer, 4 ...
... heat-sensitive recording layer, 5 ... protective layer, 6 ... colored layer.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-199284 (JP, A) JP-A-59-199285 (JP, A) JP-A-64-30786 (JP, A) JP-A-2- 137121 (JP, A) JP-A-64-144086 (JP, A) JP-A-1-103493 (JP, A) JP-B-51-11500 (JP, B1) (58) Fields investigated (Int. ⁶ , DB name) B41M 5/24

Claims (5)

(57) [Claims] 1. A magnetic recording layer is provided on a substrate, and a heat-sensitive recording layer made of a non-magnetic thin film and a protection material made of a resistive heat-generating material made of a mixture of a resin and a conductive substance are provided on the surface of the magnetic recording layer. A composite recording medium, wherein the layers are formed in this order. 2. The composite recording material according to claim 1, wherein said protective layer is made of a heat-generating material having a light transmittance and a surface resistance of 10 ⁻² to 10 ⁷ Ω / □. 3. The composite recording material according to claim 1, wherein a coloring layer is provided between the magnetic recording layer and the non-magnetic thin film layer. 4. The composite recording material according to claim 1, wherein an adhesive layer is provided between each of said layers. 5. The non-magnetic thin film layer is composed of Te, Sn, In, Al, Bi, P
The composite recording material according to claim 1, wherein the composite recording material is made of a material selected from the group consisting of b, Zn, or an alloy or compound thereof.