JPH06282962A - Magnetic recording medium provided with bar code - Google Patents

Abstract

(57) [Summary] [Structure] In a magnetic recording medium in which a magnetic recording layer and a reversible thermosensitive recording layer located thereabove are provided on at least one surface of a substrate, and an OP layer is provided as an uppermost layer,
A bar code layer is provided on a layer located below the P layer, the bar code layer being optically invisible by a bar code hiding layer located above the bar code layer. recoding media. [Effect] In addition to preventing mechanical damage to the barcode, the barcode cannot be tampered with without destroying the OP layer, so high safety is ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium provided with a rewritable reversible thermosensitive recording layer and an identification bar code.

[0002]

2. Description of the Related Art Magnetic recording media are widely used as cards that are convenient to carry and useful for various commercial transactions. This magnetic recording medium has a basic structure in which a magnetic recording layer is provided in a desired region on the surface of a base material having an appropriate thickness.

As such a magnetic recording medium, a magnetic recording medium provided with a reversible thermosensitive recording layer capable of visually printing the usage history, balance, etc. has already been put into practical use. There is. This reversible thermosensitive recording medium is made of a material that changes to transparent or opaque (white turbid) depending on its thermal history when heated by a thermal head.

It is also desirable to provide information for identifying the type of magnetic recording medium, the issuer, and the like. A bar code is the most common as the most suitable identification information. In the magnetic recording medium, the barcode is provided by means of printing or the like on the OP layer which is the uppermost layer of the medium.

[0005]

However, when the bar code is provided on the surface of the magnetic recording medium, the bar code is easily damaged during use and is always visible and readable, so that protection against tampering is required. In terms of aspects, it is not perfect.

It is an object of the present invention to provide a magnetic recording medium which eliminates the above-mentioned drawbacks by providing a bar code in a layer below the OP layer.

[0007]

According to the present invention, a magnetic recording layer and a reversible thermosensitive recording layer located thereabove are provided on at least one surface of a substrate, and an OP layer is provided as the uppermost layer. In a magnetic recording medium, a bar code layer provided on a layer located below the OP layer and a bar code located above the bar code layer and making the bar code layer optically invisible. There is provided a magnetic recording medium having a bar code, which is provided with a hiding layer.

That is, in the present invention, the bar code layer indicating the identification information is provided at least below the OP layer. Therefore, the bar code layer is always protected by the OP layer, which is surely protected from damage during carrying or reading or writing operation of information. Moreover, since the barcode layer is visually hidden by the hiding layer located above it, even the presence thereof cannot be recognized by the usual means, and the risk of tampering is extremely low.

In the present invention, the bar code layer may be provided above or below the reversible thermosensitive recording layer.

Further in a preferred embodiment of the present invention,
Under the reversible thermosensitive recording layer, a metal vapor deposition layer that functions as a light reflecting layer is provided for the purpose of improving the visibility of the visible information recorded in this layer. The barcode layer may be provided below the metal vapor deposition layer.

Alternatively, the magnetic recording layer and the bar code layer may be provided on one surface of the substrate, and the reversible thermosensitive recording layer may be provided on the other surface of the substrate.

In any case, it is desirable that the concealing layer for concealing the bar code is provided adjacent to the bar code layer, but it is provided on another layer located on the bar code layer. Can also obtain a similar concealment function.

By providing the bar code layer on the layer located below the OP layer, the layer above the bar code layer is affected by the thickness of the bar code layer to cause unevenness. It is possible to substantially eliminate the influence by performing pressure coating with a roll at the time of formation. For example, by using a roll of paper as a substrate and applying each layer by a winding method, the barcode layer can be embedded in the layer formed above the barcode layer.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the following description and the attached drawings, the same or equivalent parts are denoted by the same reference numerals.

FIG. 1 is a schematic sectional view showing a part of a magnetic recording medium provided with a bar code according to the present invention.

In FIG. 1, on the surface of the substrate 1, a magnetic recording layer 2, an anchor layer 3, a metal vapor deposition layer 4, an anchor layer 5,
The reversible thermosensitive recording layer 6 and the OP layer 7 are laminated in this order,
On the reversible thermosensitive recording layer 6 located below the OP layer 7, a bar code layer 8 and a large number of the bar code layer 8 and a hiding layer 9 are provided.

FIG. 2 shows a magnetic recording medium in which the overcoat 10 is provided on the reversible thermosensitive recording layer 6 in the structure of FIG.

Further, FIG. 3 shows a magnetic recording medium in which the bar code layer 8 and the concealing layer 9 are provided on the lower surface side of the reversible thermosensitive recording layer 6 in the configuration of FIG.

In still another embodiment shown in FIG. 4, the bar code layer 8 and the masking layer 9 are provided on the upper surface of the magnetic recording layer 2.

In the examples shown in FIGS. 1 to 4, each layer including the magnetic recording layer 2, the metal vapor deposition layer 4, the reversible thermosensitive recording layer 6, the OP layer 7, the bar code layer 8 and the hiding layer 9 is a base layer. The magnetic recording layer 2, the OP layer 7, the bar code layer 8 and the concealing layer 9 are provided on one surface of the base material 1 as shown in FIG. It is also possible to provide the anchor layer 3, the metal vapor deposition layer 4, the anchor layer 5, the reversible thermosensitive recording layer 6 and the OP layer 7 on the other surface of 1.

In the present invention, the substrate 1 is a sheet or a synthetic sheet made of synthetic resin such as polyethylene terephthalate (PET), polyvinyl acetate, polystyrene (PS), epoxy resin, polyvinyl chloride (PVC) and polycarbonate (PC). It is configured by using paper or the like. The thickness of the base material 1 is usually 100 to 300 μm.
It is a degree.

As the magnetic recording layer 2, a magnetic recording layer conventionally used in this type of magnetic recording medium can be used. For example, as a magnetic material, B having a particle size of 10 μm or less, preferably 0.01 to 5 μm
a-ferrite, Sr-ferrite, Co deposited γ-Fe
₂ O ₃ , γ-Fe ₂ O ₃ , acicular iron powder, CrO ₂ is used, and a polyester resin, an alkyd resin, a vinyl resin, a polyurethane resin or a mixed resin thereof which is generally used as a binder resin is used. You can The mixing ratio of the binder resin and the magnetic material is appropriately set in consideration of the adhesiveness with the base material 1, the strength of the coating film, the voltage detected by the magnetic head, and the like. Usually, former / latter = 1/1 by weight
The range of 1 to 1/10, preferably 1/2 to 1/8 is suitable. The thickness of the magnetic recording layer 2 is usually about 5 to 20 μm.

The metal vapor-deposited layer 4 can be formed by vapor-depositing a metal such as aluminum, tin or zinc by a usual method, and is formed on the reversible thermosensitive recording layer 6 provided thereabove. It is desirable to have a sufficiently high reflectivity to provide sufficient contrast for the opaque pattern.

The anchor layers 3 and 5 are provided on the vapor-deposited metal layer 4 as needed in order to improve the adhesiveness to the layer adjacent thereto, and the material thereof is vinyl-based, acrylic-based or Urethane resin is suitable.

The reversible thermosensitive recording layer 6 becomes opaque (white turbid) when it is heated to a temperature of the first temperature T ₁ or higher and then cooled to a lower temperature T ₂ or lower. T ₁
When it is heated to a temperature between T ₂ and T ₂ and then cooled to T ₂ or lower, it has the property of becoming transparent.

The reversible thermosensitive recording layer 6 is formed by applying a coating material in which a higher fatty acid is dispersed in a binder resin to an appropriate thickness, for example, 2 to 10 μm. The higher fatty acid has 16 to 24 carbon atoms.
Any fatty acid commonly used in the art, such as stearic acid, behenic acid, palmitic acid, etc., can be used. Also, a hydroxyl group-substituted fatty acid having 2 or more hydroxyl groups at any position on the main chain and having 14 or more carbon atoms, such as dihydroxybehenic acid, dihydroxystearic acid, trihydroxystearic acid, or tetrahydroxystearic acid and an aliphatic ester are used. In that case, there is an advantage that the transparentization temperature range is further expanded.

Further, by using the dicarboxylic acid and the aliphatic ester, there is an advantage that the clarification temperature range is expanded to the high temperature side.

As the binder resin, alkyd resin, vinyl chloride resin, urethane resin, xylene resin, phenol resin, coumarone resin, vinyltoluene resin, terpene resin, vinyltoluene / butadiene copolymer resin, vinyltoluene / acrylate copolymer. Oil-soluble resin such as resin, polyvinyl alcohol resin, methyl cellulose resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, methyl vinyl ether-maleic anhydride copolymer resin, polyacrylic acid resin, gelatin, gum arabic, etc. are used. can do.

The OP layer 7 is used as a protective layer or abrasion resistant layer in conventional magnetic recording media, for example, cellulose resin, urethane resin, polyester resin, alkyd resin, vinyl resin, epoxy. Resins, acrylic resins and the like can be used. These resins include oleoamide as a material for imparting lubricity,
Stearoamide, silicone and the like can be added. In order to reduce the amount of solvent used, an ultraviolet curable resin or an electron beam curable resin can be used.

In the present invention, the bar code layer 8 can be formed by printing in a desired pattern using an ink containing magnetic particles. In this case, OP
By scanning the barcode layer 8 with the magnetic head along the surface of the layer 7, it is possible to extract an output signal corresponding to the pattern of the barcode layer 8, and this output signal can be used to identify the magnetic recording medium. used. Alternatively, the barcode layer 8 can be formed by using an infrared absorbing ink.

The concealment layer 9 provided so as to cover the bar code layer 8 is provided for concealing a specific pattern given to the bar code layer 8 so that it cannot be visually recognized. It is formed by a means such as printing using a material that does not penetrate.

[0032]

As described above, according to the present invention,
Since the bar code layer itself is concealed by the concealment layer, it is not possible to know whether or not the magnetic recording medium has bar code information. Even if it is known, it is confirmed at which position it is provided. And the barcode pattern cannot be easily recognized.

Further, since the bar code layer is provided in a layer lower than the OP layer, the OP layer must be destroyed even if the bar code is tampered with.
This also destroys the bar code pattern, making tampering virtually impossible.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a magnetic recording medium having a barcode according to an embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view of a magnetic recording medium according to a second embodiment of the present invention.

FIG. 3 is a partial longitudinal sectional view of a magnetic recording medium according to a third embodiment of the present invention.

FIG. 4 is a partial vertical sectional view of a magnetic recording medium according to a fourth embodiment of the present invention.

FIG. 5 is a partial longitudinal sectional view of a magnetic recording medium according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic recording layer 3 Anchor layer 4 Metal vapor deposition layer 5 Anchor layer 6 Reversible thermosensitive recording layer 7 OP layer 8 Barcode layer 9 Concealment layer 10 Overcoat

Front page continuation (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location G06K 19/10 G11B 23/40 Z 7201-5D 8623-5L G06K 19/00 R

Claims (7)

[Claims] 1. A magnetic recording medium in which a magnetic recording layer and a reversible thermosensitive recording layer located above the magnetic recording layer are provided on at least one surface of a substrate, and an OP layer is provided as an uppermost layer, the magnetic recording medium having a thickness higher than that of the OP layer. A bar code layer provided on a layer located below, and a bar code hiding layer located above the bar code layer and making the bar code layer invisible optically. And a magnetic recording medium having a barcode. 2. The magnetic recording medium according to claim 1, wherein the barcode layer is provided on the reversible thermosensitive recording layer. 3. The magnetic recording medium according to claim 1, wherein the bar code layer is provided in a layer below the reversible thermosensitive recording layer. 4. The reversible thermosensitive recording layer is provided above the magnetic recording layer, and a metal vapor deposition layer is provided between the magnetic recording layer and the reversible thermosensitive recording layer. The magnetic recording medium according to 1. 5. The magnetic recording medium according to claim 4, wherein the bar code layer is provided between the magnetic recording layer and the metal vapor deposition layer. 6. The magnetic recording layer and the bar code layer are provided on one surface of the base material, and the reversible thermosensitive recording layer is provided on the other surface of the base material. 1. The magnetic recording medium according to 1. 7. The magnetic recording medium according to claim 6, wherein a metal vapor deposition layer is provided between the magnetic recording layer and the reversible thermosensitive recording layer.