JP3238190B2 - Magnetic card and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card which can be used for a prepaid card, a commuter pass, a cash card, a credit card, and the like to determine the authenticity of the card, a method of manufacturing the same, and a method of using the same.

[0002]

2. Description of the Related Art In recent magnetic cards, a prepaid card called a prepaid card has been widely used. However, since this prepaid card is treated like a voucher in the market, data tampering,
Unauthorized use such as forgery must be prevented, and various devices have been devised so far. For example, the magnetic card is subjected to magnetic recording, punching, shape, printed pattern, and the like as fixed information, and is read to determine the authenticity of the magnetic card.

[0003]

However, these methods have their advantages and disadvantages, and are not always sufficient for authenticity judgment. For example, even when an irregular pattern is used, the printing information becomes constant as long as the same printing plate is used, and there is a problem that forgery by imitation of the printing can be easily performed. Accordingly, it is an object of the present invention to provide a magnetic card, which is difficult to forge and has high security, and can easily determine the authenticity, a method of manufacturing the same, and a method of using the same.

[0004]

According to the present invention, a pigment is added to one side.
A mixture of two or more dispersed incompatible binder resins
From pigments, non-uniform pigments in the coating film, optical
An information layer that can be read is formed on the magnetic layer, and the non-uniformity is optically detected, so that information unique to the non-uniformity is used for authenticity determination. A magnetic card having such a pigment non-uniformly uses two or more incompatible binder resins, disperses the pigment in one of the binder resins, mixes these two binder resins, and forms a magnetic layer. It can be obtained by coating on top. Due to the incompatibility of the binder resin, a sea-island layer in which the pigment is unevenly formed is formed on the magnetic layer. The layers on the sea / island have different light absorption / reflection characteristics.

[0005] When two or more kinds of resins are mixed in a vehicle of a paint, a technique of forming a sea-island structure in the coating film or generating irregularities on the surface depending on their compatibility is known in other fields ( "Polymer Surface Technology", March 5, 1977,
See Nikkan Kogyo Shimbun, pp. 182 to 189, etc.). The formation of the layer having a sea-island structure depends on the action of the paint itself during the formation of the coating film, and can be performed by any coating / printing method.
Further, the non-uniformity can be controlled by adjusting the compatibility by the kind of the diluting solvent, adjusting the viscosity of the coating material by the dilution ratio, adding an additive, and the difference in the surface tension of the lower layer even if the same pigment and resin are used. Pigments that can be used in the present invention are TiO ₂ , SiO
_2. Various inorganic and organic pigments such as carbon black.
Resins that can be used in the present invention include acrylic, polyester,
In addition to isocyanate compounds, it is only necessary that compatibility can be controlled by their combination.
There are various resins such as vinyl chloride, polyurethane, alkyd, melamine, vinyl acetate, epoxy, polyamide, melamine and the like, and among these, those which are incompatible or have low compatibility are selected. Also, combining two different color pigments,
It is also possible for each to exist on the sea / island. Coating methods include bar coating, gravure coating, nozzle coating,
Any method such as blade coating can be used.

In order to form a multilayer by making the pigment non-uniformly present on the surface of the magnetic layer, various similar methods are conceivable. However, these methods are unsatisfactory as described below. (1) When a pigment is added to a normal lacquer at a low concentration, at a certain concentration or more, the pigment is uniformly filled and a clear sea / island pattern is not obtained, and when it is too thin, the sensitivity of the optical sensor decreases. (2) When a pigment which is non-uniformly aggregated is added to an ordinary lacquer, the pigment is pre-agglomerated, resulting in large surface irregularities, which has an adverse effect on recording / reproduction of the magnetic layer. (3) When different kinds of pigments having different surface properties, particle diameters, specific gravities, etc. are mixed, it is necessary to select two or more kinds of pigments having different properties, and there is a limitation in composition. (4) When a Bernard cell is formed by a method such as lowering the paint viscosity, the same pattern is formed. In addition, a security improvement method in which fibers and pigments are kneaded into the base material can be considered, but optical reading on a non-magnetic surface is required. Further, the manufacturing method is also difficult, and there is a high possibility that the base material becomes uneven, and when a magnetic layer is applied thereon, the writing / reading characteristics are affected.

[0007]

According to the present invention, the following operations and effects can be obtained. -High security can be easily obtained.・ By making the pigment non-uniform in the coating, the non-uniformity is recorded in advance (for example, before ticket issuance), and after the ticket is issued, it is checked with the record to determine the authenticity of the card. it can. The recording / verification unit is on the same surface as the magnetic recording layer, and can be implemented in a non-contact manner by an optical sensor without destroying the card.

[0008]

【Example】

Example 1 The following composition A containing two incompatible resin components was prepared. Figures are parts by weight. Titanium oxide (Kronos KR380: trade name, manufactured by Titanium Industry) 100 Acrylic resin (Acrydic A156: trade name, manufactured by Dainippon Ink and Chemicals) 50 (solid content: 20) Polyester resin (Byron 200: trade name, manufactured by Toyobo Co., Ltd.) 80 (〃20) 13) Isocyanate compound (Coronate HL: trade name, manufactured by Nippon Polyurethane) 13 (） 10) Methyl ethyl ketone x (Since Vylon 200 is a solid resin, it is 25% in advance with a solvent of methyl ethyl ketone: toluene = 8: 2.) Titanium oxide After dispersing in acrylic resin, let down with other resin and solvent. Coating was performed with a Meyer bar, and drying was performed with hot air after about 30 seconds. The amount of x is 5
When the values were changed to 0, 100, 150, and 200, a surface state in which island portions of the polyester resin were uniformly dispersed in the sea portion of the acrylic resin in which the titanium oxide pigment was present was observed, and x increased. The diameter of the island increased in proportion. When x = 150 and drying is performed 15 seconds after application, drying is the same as x = 50 after about 30 seconds, and drying after 1 minute is the same as drying when x = 200 after about 30 seconds. Was. Therefore, it can be seen that by changing various conditions, a non-uniform pattern having islands of various average particle sizes can be obtained. 1 and 2 show a planar state of an example of the obtained layer. It was also found that the surface of the polyester resin portion was thin and the portion of the acrylic resin containing the pigment was thick. When the reflected light was observed using an optical sensor, the reproduced waveform shown in FIG. 3 was obtained. However, it is a relative value when the reflected light from the portion containing the pigment is 1. The pitch of the waveform increases as x increases. As an application method of this result, for example, it is conceivable that the sea / island pattern is specified in advance by the average particle size and the particle size distribution or the standard deviation, and the read waveform from the magnetic card is compared and used for authenticity determination. .

Example 2 In the formulation A of Example 1, titanium oxide was dispersed not in an acrylic resin but in a polyester, and red-down was performed with another resin and solvent. Compared with Example 1, the island-shaped portion was inverted and the reproduced waveform was also inverted, and similar results were obtained.

Example 3 The following tendency is observed when the amount of x is the same on the substrate on which the composition A of Example 1 is applied. Surface tension is high 54 dyne / cm x = 50 Similar tendency to 45 dyne / cm x = 100 ３８ 38 dyne / cm x = 150 〃 Surface tension is low 25 dyne / cm x = 200 〃 However, surface tension is base material, base coat It was adjusted according to the composition of the film.

Example 4 The following materials and combinations thereof in the composition A of Example 1 include the following materials and combinations thereof. Acrylic resin (Acridic A156 (Dainippon Ink and Chemicals)) Polyester (Vylon 290 (Toyobo)) Isocyanate ( If Coronate L (Nippon Polyurethane) is methyl ethyl ketone, a clear interface does not appear in the cross section as in Example 1, but a clear uneven pattern is formed on the surface, and the difference in reproduction output from both parts is small and the resolution is low. Decreases, but the effect is the same.

Example 5 When a surfactant or the like having an aggregating action is added to the compositions of Examples 1 to 4, the aggregation pattern becomes large. When 2 parts of the phosphoric acid ester (Gafax RE410: Toho Chemical) was added to the composition A with respect to the resin 100, the aggregation pattern became large.

Example 6 When the solvent (x) of the composition A was not methyl ethyl ketone but methyl ethyl ketone: cyclohexane = 80: 20, the aggregation pattern became large.

[Brief description of the drawings]

FIG. 1 shows a surface pattern of a surface layer of a magnetic card according to the present invention.

FIG. 2 shows a surface pattern of a surface layer of the magnetic card according to the present invention.

FIG. 3 shows an optical reflection reproduction waveform of a surface layer of a magnetic card according to the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B42D 5/00-15/10 551 G06K 19/10 G11B 5/80

Claims (4)

(57) [Claims] 1. An incompatible two or more pigments dispersed on one side.
A magnetic card, comprising an optically readable information layer formed from a mixture of the above binder resin and having a non-uniform pigment in a coating film, on a magnetic layer. 2. A method comprising using two or more incompatible binder resins, dispersing a pigment in one of the binder resins, mixing the two or more binder resins, and applying the mixture on the magnetic layer. Optically readable sea / island-like information where the pigment is unevenly present due to incompatibility
A method for manufacturing a magnetic card in which an information layer is formed on a magnetic layer. 3. A non-uniform pigment is present due to incompatibility.
Optically who <br/> method for forming a readable Water island information layer, using two or more binder resins, to claim 2 is to make the concavo-convex structure by its incompatibility A method for manufacturing the magnetic card according to the above. 4. An incompatible two or more pigments dispersed on one side.
From a magnetic card formed of a mixture of the above binder resin and a sea / island-shaped information layer on which a pigment is non-uniformly formed on a magnetic layer, the non-uniformity is optically read and the read pattern is used. A method for judging the authenticity of a magnetic card, which judges authenticity.