JP3112997B2 - Composite recording media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium,
In particular, the present invention relates to a composite recording medium comprising a magnetic recording layer and a discharge breakdown recording layer in a single medium.

[0002]

2. Description of the Related Art Magnetic recording media in which a magnetic recording layer is formed on the surface of a plastic base material include credit cards,
It is widely used as D cards, commuter passes, magnetic tapes and the like. Such a magnetic recording medium has the advantage that the recording density is high and the recorded information cannot be easily read from the outside, but it is necessary to record the visible information together with the magnetic information on the recording medium. There is. Conventionally, in such a case, usually, visible information such as characters and graphics is printed on a margin or the back surface of the base material surface of the magnetic recording medium.

[0003]

In a method in which visible information is printed only, the information content must be uniform and fixed. Therefore, for example, individual information such as a name and an expiration date and the like are not included. Recording of additional information according to the usage of the recording medium by printing leads to an increase in manufacturing cost and is not practical.

Further, since the size of a magnetic recording medium is generally small, a space for printing necessary character information is limited, and there is a problem that a sufficient amount of visible information cannot be printed.

[0005] Furthermore, in recent years, with the spread of magnetic cards, falsification and forgery have become a social problem. Conventional magnetic recording media are provided with sufficiently effective prevention means in terms of preventing forgery. There is no present.

The present invention is to solve the above-mentioned problems of the prior art, and the present invention has the following objects. (1) To provide an information recording medium capable of recording both magnetically recorded information and visible information in a complex manner. (2) To provide an information recording medium capable of recording easily and quickly individual information such as a name and an expiration date and visible information such as additional information according to a use condition of the recording medium. (3) To provide a composite recording medium capable of double-checking magnetic information and visible information and effective in preventing forgery and falsification.

[0007]

The basic feature of the composite recording medium according to the present invention is that a magnetic recording layer and a discharge breakdown recording layer are laminated.

In a preferred embodiment of the present invention,
It is characterized in that the surface electric resistance of the magnetic recording layer is controlled in the range of 10 ³ to 10 ¹³ Ω.

Further, in a preferred embodiment of the present invention,
A barrier layer is provided between the magnetic recording layer and the discharge breakdown recording layer.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 is a sectional view showing the basic structure of a composite recording medium according to the present invention. As shown in the figure, the composite recording medium according to the present invention is formed by laminating a magnetic recording layer 2 and a discharge breakdown print recording layer 3 on a substrate 1 in this order.

The substrate 1 is made of a sheet, film or plate-like material, and is not particularly limited as a material. PET (polyethylene terephthalate), nylon, cellulose diacetate, polystyrene, polyethylene, polypropylene, polyester , Polyimide,
Plastic such as polycarbonate, metal such as copper and aluminum, paper, impregnated paper, and the like can be used alone or in combination. The thickness of the substrate is 0.005 to
About 5 mm is appropriate.

The magnetic recording layer 2 is made of γ-Fe ₂ O ₃ , Fe ₃
O ₄ , CrO ₂ , Fe, Fe—Cr, Fe—Co, Co
-Cr, Co-Ni, MnAl, Ba ferrite, Sr
A dispersion in which conventionally known magnetic fine particles such as ferrite are dispersed in a suitable resin or ink vehicle,
It can be formed on the substrate 1 by a conventionally known coating method such as a gravure method, a roll method, and a knife edge method.
Furthermore, the magnetic recording layer 2 is made of Fe, Fe-Cr, Fe
A metal or alloy such as -Co, Co-Cr, or Co-Ni can be formed on the substrate 1 by a method such as a vacuum evaporation method, a sputtering method, and a plating method. When the magnetic recording layer is formed by a coating method, its thickness is 1 to 1
It is about 00 μm, preferably about 5 to 20 μm. When the magnetic recording layer is formed on a substrate by a method such as a vacuum evaporation method, a sputtering method, and a plating method, the thickness of the magnetic recording layer is 100 Å to 1 μm, preferably 500 to 2000 μm.
Angstroms.

The resin or ink vehicle 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, and acrylic resin. A resin, a styrene / maleic acid copolymer resin or the like is used, and a rubber-based resin such as a nitrile rubber or a urethane elastomer can be added as necessary. If necessary, a surfactant, a silane coupling agent, a plasticizer, a wax, a silicone oil, carbon, and other additives can be used.

In the present invention, it is preferable that the surface electric resistance of the magnetic recording layer is limited to a specific range. Specifically, the surface electric resistance is in the range of 10 ³ Ω to 10 ¹² Ω, more preferably. Is preferably controlled in the range of 10 ⁵ to 10 ⁹ Ω in order to satisfy both the printing performance on the discharge breakdown printing layer described later and the improvement of the magnetic characteristics. That is, if the surface electric resistance of the magnetic recording layer 2 constituting the lower layer of the discharge breakdown printing layer 3 is less than 10 ³ Ω, it is difficult to secure a sufficient resistance for performing the discharge breakdown recording. Exceeds 10 ¹² Ω, the discharge printing performance is greatly reduced, which is not preferable. In the present invention, the surface electric resistance of the magnetic recording layer 2 itself is set to 10 ³ to 10 ¹² instead of separately providing a low resistance layer below the discharge breakdown printing layer 3.
By setting in the range of Ω, the same function as the above low resistance layer is realized, thereby preventing the deterioration of the magnetic characteristics due to the spacing loss, and improving the discharge breakdown printing and the magnetic recording characteristics. Can be expressed.

Therefore, in the present invention, in order to control the surface electric resistance of the magnetic recording layer to the above range,
An inorganic pigment can be added to the magnetic recording layer. Examples of pigments added for such purposes include carbon, metal oxides such as titanium oxide, tin oxide, and indium oxide, and metals such as gold, silver, nickel, aluminum, and copper. The amount of the pigment to be added can be appropriately selected according to the material thereof, but is usually about 0.1 to 20% by weight.

The discharge destruction printing recording layer 3 is made of a thin film of a single metal, alloy or compound, and is a layer whose recording portion can be destroyed by utilizing a discharge phenomenon. Specifically, Al, N
metals such as i, Sn, Zn, Te, In, Bi, Pb,
Alternatively, these alloys and compounds are used. The discharge breakdown print recording layer 3 can be formed on the magnetic recording layer 2 by a method such as a vacuum evaporation method, a sputtering method, and a plating method.
The film thickness of the discharge breakdown recording layer 3 is about 100 Å to 1 μm, more preferably about 300 Å to 1000 Å.

When information is recorded on the discharge-destruction print recording layer, an earth roller 1 is placed on the surface of the medium as shown in FIG.
0 is contacted to generate a discharge in accordance with the recording information by the recording pin 11 to form a discharge breakdown portion 12 in the discharge breakdown print recording layer 3 to record information.

In the present invention, it is possible to record magnetic recording information on the magnetic recording layer and to record visible information on the discharge breakdown printing recording layer in a superimposed manner. In this discharge breakdown print recording layer, for example, individual information such as a name and an expiration date and visible information such as additional information according to the use condition of a recording medium can be recorded simply and quickly.

As described above, in the present invention, different information of the two types of recording means can be recorded in a complex manner, so that magnetic information and visible information can be double-checked in a single recording medium. Therefore, it is effective in preventing forgery and alteration.

FIG. 2 shows an example in which a barrier layer 4 is formed between the magnetic recording layer 2 and the discharge breakdown print recording layer 3, and an anchor layer 5 and a protective layer 6 are further formed on the discharge breakdown print layer 3. is there.

The barrier layer 4 is effective in preventing the discharge breakdown print layer 3 from being deteriorated due to leaching of water or the like into the magnetic recording layer. As described above, when a pigment is added to the magnetic recording layer in order to control the surface electric resistance value of the magnetic recording layer within a specific range, the added pigment, the magnetic fine particles, and the impurities contained therein are subjected to discharge breakdown printing. Although the deterioration of the recording layer is promoted, in order to prevent the deterioration, it is preferable to form a barrier layer 4 between the magnetic recording layer 2 and the discharge breakdown recording layer 3 as shown in FIG. The barrier layer can be composed of a cured layer such as an acrylic resin.

The protective layer 6 is formed for the purpose of protecting the recording layer in order to secure the physical characteristics and durability of the recording medium. It is provided for the purpose of improving the adhesiveness with the layer 6. The protective layer can be made of a thin material having a large surface strength, for example, a UV-curable synthetic resin film. Anchor layer is a resin with excellent adhesive properties, such as polyester resin, urethane resin,
It can be composed of a vinyl chloride / vinyl acetate copolymer, an ethylene / vinyl acetate copolymer, an ionomer resin, a polyolefin-based copolymer, or the like.

The thicknesses of the protective layer 6 and the anchor layer 5 are desirably adjusted so that the total thickness of these two layers is 2 μm or less. If the total thickness of these layers formed on the discharge breakdown print recording layer 3 exceeds 2 μm, the printing characteristics on the discharge breakdown print recording layer will be greatly reduced.

[0025]

The composite recording medium of the present invention has the following effects because the magnetic recording layer and the discharge-disruption print recording layer are laminated. (1) Both magnetically recorded information and visible information can be recorded in a complex manner. (2) Visible information such as individual information such as name and expiration date and additional information according to the usage of the recording medium can be easily and quickly recorded. (3) Magnetic information and visible information can be double-checked, making forgery and falsification difficult.

[0026]

EXAMPLE A coating having the following composition was applied on a 188 μm thick polyethylene terephthalate film (PET film) by a gravure coating method to form a magnetic recording layer having a thickness of 10 μm.

Barium ferrite 36 parts by weight Urethane resin 12 parts by weight Carbon 2 parts by weight Toluene 20 parts by weight Methyl ethyl ketone 15 parts by weight Methyl isobutyl ketone 15 parts by weight Isocyanate-based curing agent 2 parts by weight On the magnetic recording layer formed as described above. In addition, a coating of the following composition as a barrier layer by a gravure coating method,
The coating was formed to a thickness of 0.5 μm.

Acrylic resin 40 parts by weight Toluene 30 parts by weight Methyl ethyl ketone 30 parts by weight Isocyanate-based curing agent 2 parts by weight Aluminum is formed on the above barrier layer to a thickness of 400 Å by a vacuum evaporation method, and this is recorded by discharge breakdown printing. Layers.

Further, a coating having the following composition was formed on the discharge breakdown recording layer by a gravure coating method to form an anchor layer having a thickness of 0.5 μm.

Polyester resin 10 parts by weight Vinyl chloride / vinyl acetate copolymer 10 parts by weight Toluene 50 parts by weight Methyl ethyl ketone 50 parts by weight Isocyanate curing agent 5 parts by weight Finally, a paint having the following composition is coated on the anchor layer by a gravure coating method. And a protective layer having a thickness of 1 μm was formed.

Polyvinyl butyral resin 10 parts by weight Urethane resin 10 parts by weight Tetrafluoroethylene powder 10 parts by weight Ethyl acetate 30 parts by weight Toluene 30 parts by weight Methyl ethyl ketone 30 parts by weight For the composite recording medium of the present invention thus obtained, When magnetic recording and discharge breakdown printing recording were performed, clear printing was performed, and read / write of magnetic recording was also performed without any problem.

[0032]

Comparative Example A comparative example was prepared in the same manner as above except that no carbon was added to the coating material for the magnetic recording layer. The surface resistance of the magnetic recording layer is 2.4 × 10 ¹⁵ (Ω)
It became. When magnetic recording and discharge breakdown printing recording were performed on this composite recording medium, reading and writing of the magnetic recording were performed without any problem, but very unclear printing was obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic configuration of a composite recording medium according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a composite recording medium according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic recording layer 3 Discharge-discharge print recording layer 4 Barrier layer 5 Anchor layer 6 Protective layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-199284 (JP, A) JP-A-51-51943 (JP, A) JP-A-62-94396 (JP, A) JP-A-2- 137121 (JP, A) JP-A-3-22215 (JP, A) JP-A-4-368613 (JP, A) JP-A-2-130371 (JP, U) JP-A 52-107609 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B42D 15/10 501-551 G11B 5/70

Claims (4)

(57) [Claims] 1. A composite recording medium comprising a magnetic recording layer and a discharge-destruction printing recording layer laminated, wherein the surface electric resistance of the magnetic recording layer is controlled in the range of 10 ³ Ω to 10 ¹² Ω. A composite recording medium, characterized in that: 2. The composite recording medium according to claim 1, wherein a magnetic recording layer and a discharge breakdown recording layer are laminated in this order on a base material. 3. The composite recording medium according to claim 2, wherein an anchor layer and a protective layer are formed in this order on said discharge breakdown print recording layer. 4. A composite recording medium comprising a magnetic recording layer and a discharge breakdown print recording layer laminated on each other, wherein a barrier layer is provided between the magnetic recording layer and the discharge breakdown print recording layer. Characterized by a composite recording medium.