JPH0768942A - Heat-sensitive magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a recording medium wherein a large amt. of both magnetic information and visible information are input by providing both a magnetic recording layer on the upper face of a substrate and a magnetic thin film layer consisting of a metal, an alloy or a compd. thereof on the magnetic recording layer as a heat-sensitive recording layer. CONSTITUTION:A heat-sensitive magnetic recording body 1 is constituted by providing both a magnetic recording layer 3 on the upper face of a substrate 2 and a magnetic thin film layer 4 consisting of a metal, an alloy or a compd. thereof on the magnetic recording layer 3 as a heat-sensitive recording layer. In this case, the compd. may be an oxide of a magnetic metal or an alloy thereof. In addition, the magnetic thin film layer is at least one selected from a group consisting of Fe, Co, Ni, Fe-Co, Fe-Co-Ni, gamma-Fe2O3, Co-doped iron oxide, etc., or a mixture thereof. On the other hand, a coloring layer 5 may be provided on the upper face of the magnetic thin film layer 4. In addition, a protective layer may be provided on the uppermost layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosensitive magnetic recording medium having a magnetic recording layer and a thermosensitive recording layer.

[0002]

2. Description of the Related Art A magnetic recording medium having a magnetic recording layer provided on the surface of a substrate such as plastic is a credit card, cash card, ID card, boarding ticket, commuter pass, magnetic tape. Widely used as such. Such a magnetic recording medium has an advantage that the recording density is high and the recorded information cannot be easily read from the outside, but the recorded information is inevitably invisible, and therefore, these recording media In some cases, it may be necessary to record visible information in the.

In such a case, it has been practiced to print characters, designs, etc. on the margins or the back surface of the base surface of the magnetic recording medium. However, since the magnetic recording medium is generally small in size, There is a shortage of space for printing visible information such as necessary characters, and it is not possible to print a sufficient amount of information.

Therefore, in recent years, a magnetic recording medium in which visible information such as characters and patterns is formed on the magnetic recording layer of the magnetic recording medium by a printing means has appeared. However, since the visible information is formed by various printing means, its contents are uniform and fixed, and there is a drawback that the change is scarce. Further, on the magnetic recording layer, for example, a bar code, an OCR character, a name,
Printing individual information such as the expiration date leads to an increase in manufacturing cost, which is not practical.

Further, since the printing ink of 2 to 5 μm is provided on the magnetic recording layer, 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-printing portion. However, there is also a drawback that the output fluctuation becomes large.

By the way, in recent years, forgery / alteration of magnetic recording media such as cash cards, credit cards, and commuter passes has become a big social problem, and many studies have been made on how to prevent forgery / alteration of magnetic recording information. However, a simple and effective method of preventing forgery / alteration of magnetic recording information has not yet been found.

The present invention is intended to solve the problems associated with the prior art as described above, and the present invention has the following objects. a) To provide a recording medium capable of incorporating a large amount of information including both magnetic information and visible information. b) To provide a recording medium on which individual visible information can be easily recorded according to each situation. c) To provide a recording medium that cannot easily forge or alter magnetic information. d) To provide a recording medium that can be checked by magnetic information and visible information and can be double checked, and that is difficult to counterfeit or alter. e) To provide a recording medium in which the decrease in the magnetic output due to the visible recording portion provided on the magnetic recording layer is small.

[0008]

In a thermosensitive magnetic recording medium according to the present invention, a thin film layer made of a metal or an alloy or a compound thereof is provided as a thermosensitive recording layer on a magnetic recording layer provided on a substrate. Characteristically, visible information is recorded by destroying the thin film layer with a heating means such as a laser beam or a thermal head. The metal or alloy is composed of magnetic metal.

Further, if necessary, a colored layer or a protective layer for clarifying visible information may be provided on the magnetic thin film layer, and a colored layer may be provided between the thin film layer and the magnetic recording layer. It is also possible to provide an adhesive layer for increasing the adhesive force between the layers to prevent peeling between the layers in some cases.

In some cases, a thin film layer made of a metal or an alloy or a compound thereof (preferably an oxide) is provided on the substrate as a heat sensitive recording layer, and a magnetic recording layer is provided on the thin film layer to provide a heat sensitive magnetic layer. A recording medium may be configured. In this case, the substrate is transparent and visible information is recorded by destroying the thin film layer with a laser beam. The metal or alloy is composed of a magnetic metal, and thus the thin film layer is a magnetic thin film layer.

The present invention will be described below with reference to specific examples shown in the drawings.

The thermosensitive magnetic recording medium 1 according to the present invention comprises a first
As shown in the figure, it is composed of a sheet-like or plate-like substrate 2, a magnetic recording layer 3 provided thereon, and a magnetic thin film layer 4 provided on the magnetic recording layer 3 as a heat-sensitive recording layer. Has been done. The magnetic recording layer 3 is provided entirely or partially on the surface of the substrate 2. In addition, the magnetic thin film layer 4
Is provided on the surface of the magnetic recording layer 3 wholly or partially, but in some cases, as shown in FIG.
The magnetic thin film layer 4 may be provided on the surface of the substrate 2 over a wider area than the magnetic recording layer 3.

Another specific example of the thermosensitive magnetic recording medium 1 according to the present invention is shown in FIGS. In the thermosensitive magnetic recording medium 1 shown in FIG. 3, a magnetic recording layer 3, a magnetic thin film layer 4, and a coloring layer 5 are laminated in this order on a substrate 2, and the coloring layer 5 is recorded as visible. It has the function of giving contrast to information for clarity.

In the thermosensitive magnetic recording medium 1 shown in FIG. 4, a magnetic recording layer 3, a coloring layer 5 and a magnetic thin film layer 4 are laminated in this order on a substrate 2, and the coloring layer 5 is recorded. It has a function of giving contrast to the visible information.

In the thermosensitive magnetic recording medium 1 shown in FIG. 5, a magnetic recording layer 3, a magnetic thin film layer 4 and a protective layer 6 are laminated in this order on a substrate 2, and the protective layer 6 is magnetic. Thin film layer 4
Plays a role in protecting the surface of.

In the thermosensitive magnetic recording medium 1 shown in FIG. 6, a magnetic recording layer 3 and a magnetic thin film layer 4 are laminated in this order on a substrate 2, and a magnetic recording layer 3 and a magnetic thin film layer 4 are formed. An adhesive layer 7 is provided between them. The adhesive layer 7 serves to strengthen the adhesiveness between the magnetic recording layer 3 and the magnetic thin film layer 4 and prevent the layers from peeling off.

The thermal recording medium 1 shown in FIG. 7 has a magnetic recording layer 3, a first colored layer 5a, and a magnetic thin film layer 4 on a substrate 2.
And the second colored layer 5b are stacked in this order. By providing two colored layers, when only the magnetic thin film layer 4 is destroyed by a laser beam or the like for printing, the printed portion looks like the first colored layer 5a and the second colored layer 5b overlap, and On the other hand, when both the second colored layer 5b and the magnetic thin film layer 4 are destroyed by a laser beam or the like and printed, the printed portion exhibits the color of the first colored layer 5a and the color of the surrounding second colored layer 5b. Clearly distinguished.

In the thermosensitive magnetic recording medium 1 shown in FIG. 8, a magnetic recording layer 3 and a magnetic thin film layer 4 are laminated in this order on both front and back surfaces of a substrate 2, and magnetic information and visible information are recorded. Many can be recorded.

In the thermosensitive magnetic recording medium 1 shown in FIG. 9, a magnetic thin film layer 4 is provided on a transparent substrate 2, and a magnetic recording layer 3 is provided on this magnetic thin film layer. This recording medium 1
Is preferable when the physical strength of the magnetic thin film layer is weak because the magnetic thin film layer 4 is not exposed on the outer surface.
In this case, it is desirable that writing on the magnetic thin film layer 4 which is a heat sensitive recording layer is performed by a laser beam through the transparent substrate 2.

The method of manufacturing the thermosensitive magnetic recording medium according to the present invention and the materials used will be described below.

In the thermosensitive magnetic recording medium 1 according to the present invention, a magnetic recording layer 3 and a magnetic thin film layer 4 are provided directly on a substrate 2 and, if necessary, a coloring layer 5, a protective layer 6 or an adhesive layer 7.
Can be formed by a direct method provided by a printing method or a coating method.

Further, as shown in FIG. 10, the protective layer 6, the coloring layer 5, and the protective layer 6 are once provided on the transfer substrate 8 via the release layer 9.
A transfer laminate 11 in which the first adhesive layer 7a, the magnetic thin film layer 4, the second adhesive layer 7b, the magnetic recording layer 3 and the hot melt adhesive layer 10 are laminated in this order is prepared, and the hot melt of the laminate 11 is prepared. The recording medium 1 according to the present invention can also be formed by a transfer method in which the adhesive layer 10 is adhered to the surface of the substrate 2 and the transfer substrate 8 is removed by the release layer 9.

Further, as shown in FIG. 11, a sticking laminated body 13 in which the magnetic recording layer 3 and the magnetic thin film layer 4 are once laminated on the sticking substrate 12 is prepared, and the back surface of the laminated body 13 is prepared. It is also possible to form the recording medium 1 according to the present invention by a bonding method in which the adhesive layer 14 is provided and the substrate 2 and the adhesive substrate 12 are integrally bonded via the adhesive layer 14.

The substrate 2 is in the form of a sheet or a plate, and examples of the substrate 2 include nylon, cellulose diacetate, cellulose triacetate, polystyrene, polyethylene, polypropylene, polyester, polyimide, polycarbonate and other plastics, and copper. , Metal such as aluminum, paper, and impregnated paper can be used alone or in combination to form a composite. Considering the physical properties required for the base material, such as strength, rigidity, hiding power, and light opacity, a preferable material may be appropriately selected from the above materials. The thickness of the base material 2 is 0.005 to 5
It is about mm.

The magnetic recording layer 3 is composed of γ-Fe ₂ O ₃ , Co-deposited γ-Fe ₂ O ₃ , Fe ₃ O ₄ , CrO ₂ , Fe and Fe.
-Cr, Fe-Co, Co-Cr, Co-Ni, MnA
1, a dispersion of conventionally known magnetic fine particles such as Ba ferrite, Sr ferrite, etc. dispersed in an appropriate resin or ink vehicle is applied to a substrate by a conventionally known coating method such as a gravure method, a roll method or a knife edge method. 2 can be formed on. The magnetic recording layer 3 is made of Fe,
A metal or alloy such as Fe-Cr, Fe-Co, or Co-Cr, or an oxide thereof may be used to form it 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 the coating method, its thickness is 1 to 100 μm, preferably 5 μm.
It is about 20 microns. When the magnetic recording layer 3 is formed by a vacuum vapor deposition method, a sputtering method, or a plating method, the film thickness thereof is 100 angstroms to 1 micron, preferably 500 to 2000 angstroms.

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

The magnetic thin film layer 4 is made of Fe, Co, Ni, Fe.
-Co, Fe-Cr, Fe-V, Fe-Ni, Fe-P
t, Fe-Pd, Fe-Cu, Fe-Zn, Co-N
i, Co-Cr, Co-V, Co-Cu, Co-Mn,
Co-P, Ni-Cr, Ni-Cu, Ni-Zn, Ni
-V, Ni-Mn, Fe-Co-Ni, Fe-Mn-C
o, Fe-Ni-Cr, Fe-Ni-Mn, Fe-Co
-Cr, Co-Mn-Ni, Co-Ni-P, γ-Fe
₂ O ₃ , Fe ₃ O ₄ , Co-doped iron oxide, Co-deposited iron oxide, CrO ₂ , BaO · 6Fe ₂ O ₃ , SrO · 6Fe
A metal or alloy such as ₂ O ₃ or a mixture thereof can be formed on the magnetic recording layer provided on the base material 2 by a vacuum deposition method, a sputtering method, a plating method, or the like. Since the magnetic thin film layer 4 serves as a heat-sensitive recording layer, it preferably has a low melting point. The film thickness of the magnetic thin film layer is 100 angstroms to 1 micron, preferably about 500 to 1000 angstroms.

The coloring layer 5 comprises a cellulose derivative such as ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, or cellulose acetate,
Styrene resin such as polystyrene and poly-α-methylstyrene, or styrene copolymer resin, homopolymer or copolymer resin of acrylic resin or methacrylic resin such as polymethylmethacrylate, polyethylmethacrylate, polyethylacrylate and polybutylacrylate. As a binder for rosin, rosin-modified maleic acid resin, rosin-modified phenolic resin, rosin ester resin such as polymerized rosin, polyvinyl acetate resin, coumarone resin, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin, butyral resin, etc. , Various pigments are added according to the color to be colored, and if necessary, a plasticizer, a stabilizer,
Ordinary gravure method, roll using a colored paint or ink prepared by adding wax, grease, desiccant, drying aid, curing agent, thickener, dispersant and thoroughly kneading with solvent or diluent It can be formed at a desired portion by a coating method such as a coating method, a knife edge method, an offset method or a printing method.

The protective layer 6 can be formed by laminating a synthetic resin film, by an extrusion coating method, or by coating a synthetic resin paint. As the synthetic resin forming the protective layer, the same synthetic resins as those used in forming the colored layer can be widely used in consideration of the application or the adhesiveness with other layers. In particular, use of a thermosetting synthetic resin is advantageous in terms of surface hardness and prevention of contamination, and if a coating material containing an ultraviolet curable synthetic resin is used, curing after application can be instantaneously performed. preferable. Further, the surface can be made releasable by adding silicone or the like to the protective layer.

The adhesive layer 7 is a vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, vinyl chloride / propionic acid copolymer, rubber resin, cyanoacrylate resin, cellulose resin, ionomer resin, polyolefin. In a binder such as a system copolymer, if necessary,
After adding a plasticizer, a stabilizer, a curing agent, etc., using an adhesive layer coating obtained by sufficiently kneading with a solvent or a diluent,
It can be formed on a desired portion on the substrate by a coating method such as a gravure method, a roll method, or a knife edge method. In particular, when an adhesive layer is provided on the magnetic recording layer, it is preferable that a thermoplastic resin is emulsified and applied and dried to form a heat-sealing type adhesive layer in order to prevent the magnetic recording layer from being redissolved. .

The magnetic information is recorded in the magnetic recording layer 3 by a usual method such as a magnetic head. On the other hand, visible information such as barcode, OCR characters, name, expiration date,
Recording is performed by selectively destroying the magnetic thin film layer with a heating means such as a thermal head, a laser beam, or a hot stamp.

When recording magnetic information and visible information,
You may record in the order of visible information and then magnetic information,
Alternatively, the magnetic information and the visible information may be recorded in this order. However, since the heating means is used to record the visible information, when the temperature of the magnetic recording layer may be higher than the Curie temperature when recording the visible information, the visible information is first recorded and then the magnetic information is recorded. Is preferably recorded.

[0034]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the following examples, all "parts" are parts by weight unless otherwise specified. Example 1 On a polyethylene terephthalate sheet having a thickness of 188 μm, 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 μm. Then, a Co—Ni (Co80
%, Ni 20%, the same hereinafter) was measured by a film thickness measurement method using a quartz oscillator and vapor-deposited to a film thickness of 500 Å to form a magnetic thin film layer serving as a thermal recording layer.

Composition of magnetic paint: Co-deposited γ-Fe ₂ O ₃ 75 parts ^{(“X-6000” manufactured by Titanium Industry Co., Ltd.)} Partially saponified vinyl chloride / vinyl acetate copolymer resin 10 parts ^{(manufactured by Union Carbide Co.) Vinylite VAGH ")} Polyurethane elastomer resin 10 parts ^{(Sanyo Kasei Kogyo's" Samprene IB114B ")} Linear saturated polyester resin 5 parts ^{(Toyobo" Byron RV53SS ")} Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts Toluene 50 parts Isocyanate curing agent 3 parts ^{("AT My Tech NY-220A" manufactured by Mitsubishi Kasei Co.)} Example 2 After forming a magnetic recording layer and a magnetic thin film layer on a polyethylene terephthalate sheet in the same manner as in Example 1, a colored paint having the following composition was used. , Thickness 3 by gravure coating method
A micron colored layer was formed.

Composition of Colored Paint: Partially Saponified Vinyl Chloride / Vinyl Acetate Copolymer Resin 20 Parts ^{(Union Carbide's "Vinylite VAGH")} Pigment 10 Parts Isocyanate Curing Agent 3 parts ^{(Takenate D110N, Takeda Pharmaceutical Co., Ltd.) )} Methyl ethyl ketone 30 parts Toluene 30 parts Example 3 A magnetic recording layer was formed on a polyethylene terephthalate sheet in the same manner as in Example 1, and then the same colored paint as that used in Example 2 was used to form a film having a thickness of 3 μm. The colored layer of was formed. Then, Co-Ni was vapor-deposited thereon to a film thickness of 500 Å by a vacuum vapor deposition method to form a magnetic thin film layer serving as a heat-sensitive recording layer. Example 4 In the same manner as in Example 1, after forming a magnetic recording layer and a magnetic thin film layer on a polyethylene terephthalate sheet, a protective layer coating material having the following composition was used to form a protective layer having a thickness of 1 micron by a gravure coating method. did.

Composition of paint for protective layer: Polyvinyl butyral resin 3 parts ^{(Sekisui Chemical Co., Ltd. “ESREC BX”)} Moisture curable urethane resin 3 parts ^{(Mitsui Toatsu Co., Ltd. “Orestar M95-50A”)} Methyl ethyl ketone 30 parts Toluene 30 parts Ethyl acetate 30 parts Example 5 A magnetic recording layer was formed on a polyethylene terephthalate sheet in the same manner as in Example 1, and then a coating material for an adhesive layer having the following composition was used to form a 0.5 micron thick gravure coating method. The first adhesive layer was formed. Then, Co-Ni was vapor-deposited thereon to a film thickness of 500 angstroms by a vacuum vapor deposition method to form a magnetic thin film layer as a heat-sensitive recording layer.

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

(A) On a 25-micron-thick polyethylene terephthalate sheet, a 1-micron-thick release layer was formed by a gravure coating method using a release-layer coating composition having the following composition.

Composition of coating for release layer: Cellulose acetate resin 5 parts ^{(manufactured by Dainippon Celluloid Co.)} methylol melamine thermosetting resin 1 part ^{(manufactured by Nippon Carbide)} methyl ethyl ketone 50 parts methyl alcohol 25 parts toluene 25 parts (b ) Using the same protective layer paint used in Example 4,
A protective layer having a thickness of 1 micron was formed on the release layer by a gravure coating method.

(C) Using the same colored paint as used in Example 2, a colored layer having a thickness of 3 μm was formed on the protective layer by a gravure coating method.

(D) Using an adhesive layer coating composition having the following composition,
A second adhesive layer having a thickness of 0.5 μm was formed on the colored layer by the gravure coating method. This second adhesive layer is for improving the adhesiveness between the colored layer and the magnetic thin film.

Composition of paint for second adhesive layer: Acrylic resin 1 part ^{(manufactured by Toray, “Cotax LK-761”) Polygrindyl} ether 1 part ^{(manufactured by Toray, “Denacol EX-612”)} 50 parts methyl ethyl ketone Toluene 50 parts (e) Co-Ni having a film thickness of 500 angstrom was provided on the second adhesive layer by a vacuum evaporation method to form a magnetic thin film.

(F) Using the same adhesive layer coating material as used in Example 5, a first adhesive layer having a thickness of 0.5 μm was formed on the magnetic thin film by a gravure coating method.

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

(H) A hot-melt adhesive layer having a thickness of 10 μm was formed on the magnetic recording layer by a gravure coating method using a coating composition for the hot-melt adhesive layer having the following composition.

Composition of paint for hot-melt adhesive layer: Vinyl chloride / vinyl acetate copolymer resin 1 part ^{(“Denkalac 721” manufactured by Denki Kagaku KK)} Acrylic resin 2 parts Toluene 8 parts Ethyl acetate 8 parts Next, in this way The transfer tape produced as described above was thermally transferred onto a vinyl chloride base material to produce a card having a vertical length of 86 mm, a width of 54 mm and a thickness of 0.8 mm. Example 7 Bar codes, OCR characters, Chinese characters, Roman characters, etc. were printed on recording media manufactured according to Examples 1 to 6 above with an Ar laser at an applied energy density of 50 mJ / mm ² . A pattern was formed.
The bar code and OCR characters were clear enough to be read by a machine.

Then, magnetic recording was performed on this printed recording medium with a magnetic head, and a recording density of 420 FRP was obtained.
I (flux reversal per inch)
The playback output is 5.9V in the printing section and 6.3 in the non-printing section.
The output reduction due to printing was 6%, and the effect of the printing on the reproduction output was within a practically acceptable range.

[0049]

The thermosensitive magnetic recording medium according to the present invention has the following effects because it has a thermosensitive recording layer composed of a magnetic recording layer and a magnetic thin film layer. a) Both magnetic information and visible information can be recorded on the recording medium, and since the heat-sensitive recording layer can also be a magnetic recording layer, a large amount of information can be recorded. b) In addition to magnetic information, individual visible information according to each situation can be easily recorded. c) Since the thermosensitive recording layer composed of a magnetic thin film layer is integrally provided on the magnetic recording layer, the recording medium is different from the recording medium having only the magnetic recording layer by changing the magnetic characteristics. It becomes difficult to match the magnetic characteristics when the product is forged or altered. d) Magnetic information, bar code, OC on the recording medium
Since visible information such as R characters can be recorded, and these visible information can also be magnetic recognition information, magnetic check, mechanical read check, and double check with both can be performed. From this point as well, forgery / alteration of the recording medium is possible. Have difficulty.
In particular, since the conditions for performing mechanical read-out check by the optical system are severe, it is possible to support a wide range of applications only by magnetic recognition. e) The thickness of the magnetic thin film layer, which is the 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 therefore, between the magnetic head and the magnetic recording layer. The spacing loss is small and the output fluctuation of the playback output is small.

[Brief description of drawings]

FIG. 1 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 2 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 3 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 4 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 5 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 6 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 7 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 8 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 9 is a sectional view of a thermosensitive magnetic recording medium according to the present invention.

FIG. 10 is a cross-sectional view of a transfer laminate used when manufacturing a magnetic recording medium according to the present invention.

FIG. 11 is a cross-sectional view of a transfer laminate used when manufacturing a magnetic recording medium according to the present invention.

[Explanation of symbols]

 1 recording medium 2 substrate 3 magnetic recording layer 4 magnetic thin film layer 5 colored layer 6 protective layer

Claims (13)

[Claims] 1. A heat-sensitive magnetic recording comprising a magnetic recording layer provided on a substrate, and a magnetic thin film layer made of a metal, an alloy or a compound thereof provided on the magnetic recording layer as a heat-sensitive recording layer. Medium. 2. The thermosensitive magnetic recording medium according to claim 1, wherein the compound is an oxide of a magnetic metal or an alloy thereof. 3. The magnetic thin film layer comprises Fe, Co, Ni, F
e-Co, Fe-Cr, Fe-V, Fe-Ni, Fe-
Pt, Fe-Pd, Fe-Cu, Fe-Zn, Co-N
i, Co-Cr, Co-V, Co-Cu, Co-Mn,
Co-P, Ni-Cr, Ni-Cu, Ni-Zn, Ni
-V, Ni-Mn, Fe-Co-Ni, Fe-Mn-C
o, Fe-Ni-Cr, Fe-Ni-Mn, Fe-Co
-Cr, Co-Mn-Ni, Co-Ni-P, γ-Fe
₂ O ₃ , Fe ₃ O ₄ , Co-doped iron oxide, Co-deposited iron oxide, CrO ₂ , BaO · 6Fe ₂ O ₃ , SrO · 6Fe
The thermosensitive magnetic recording medium according to claim 1, comprising at least one selected from the group consisting of ₂ O ₃ and a mixture thereof. 4. A colored layer is provided on the magnetic thin film layer.
The heat-sensitive magnetic recording medium according to. 5. The thermosensitive magnetic recording medium according to claim 1, wherein a colored layer is provided between the magnetic recording layer and the magnetic thin film layer. 6. The thermosensitive magnetic recording medium according to claim 1, wherein a first colored layer is provided between the magnetic recording layer and the magnetic thin film layer, and a second colored layer is provided on the magnetic thin film layer. 7. The thermosensitive magnetic recording medium according to claim 1, wherein a protective layer is provided on the uppermost layer. 8. The thermosensitive magnetic recording medium according to claim 1, wherein an adhesive layer is provided between the respective layers. 9. A thermosensitive magnetic recording medium characterized in that a magnetic thin film layer made of a metal, an alloy or a compound thereof is provided as a thermosensitive recording layer on a transparent substrate, and a magnetic recording layer is provided on the thin film layer. . 10. The thermosensitive magnetic recording medium according to claim 9, wherein the compound is an oxide of a magnetic metal or an alloy thereof. 11. The thermosensitive magnetic recording medium according to claim 9, wherein a colored layer is provided between the magnetic recording layer and the magnetic thin film layer. 12. The thermosensitive magnetic recording medium according to claim 9, wherein a protective layer is provided on the uppermost layer. 13. An adhesive layer is provided between the respective layers.
13. The thermosensitive magnetic recording medium according to any one of 1 to 12.