JPH0969177A - Authenticity judgment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a recording medium from being forged or frauduently altered by comparing individual medium information stored in a reader with electromagnetic wave information detected by irradiating the recording medium with an electromagnetic wave and judging the authenticity of the recording medium. SOLUTION: The recording medium 10 is irradiated with an electromagnetic wave radiated from an electromagnetic wave irradiation device 20, the reflected electromagnetic wave is detected by an electromagnetic wave detector 31, amplified by an amplifier 32 and converted into a digital signal by an A/D converter 33 and the digital signal is inputted to a CPU 34. The individual information of the medium 10 has been recorded in the CPU 34. The authenticity of the medium 10 is judged by comparing the electromagnetic wave information of the medium 10 obtained from an electromagnetic wave absorbing layer and an electromagnetic wave reflecting layer with the indivisual medium information stored in the CPU 34. Since plural security means are prepared, the recording medium can be prevented from being forged or frauduently altered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a genuineness / counterfeit determination system having a high security performance, which comprises a recording medium and a reading device for reading the recording medium.

[0002]

2. Related Art and Problems to be Solved by the Invention
Cards used for boarding tickets, commuter tickets, credit cards, prepaid cards, etc. usually have a magnetic layer for recording various information on a base material such as paper or plastic.
However, the fraudulent act of forging or altering and using these cash-exchangeable cards has become a problem.

Therefore, there is known a method of providing an information recording card which is difficult to be counterfeited or altered and a discriminating portion for discriminating authenticity, which is different from the magnetic layer, on the card in order to discriminate the authenticity of the card. However, a malicious fraudulent act of knowing the configuration of the above-mentioned identification unit for authenticity determination and forging has also occurred.

An object of the present invention is to provide a genuine / counterfeit determination system having high security performance which can prevent forgery or alteration.

[0005]

The gist of the present invention is to provide a recording medium having at least an electromagnetic wave absorbing layer and an electromagnetic wave reflecting layer having a plurality of different patterns, a reading device for reading the recording medium, and an electromagnetic wave irradiating device. In the authenticity determination system having, the reading device stores medium individual information that correlates with electromagnetic wave information detected by irradiating the recording medium with electromagnetic waves emitted from the electromagnetic wave irradiating device. The authenticity determination system is characterized by determining the authenticity of the recording medium by comparing the medium individual information stored in (3) with the electromagnetic wave information detected by irradiating the recording medium with an electromagnetic wave. The medium individual information is preferably stored in the reading device as digital information obtained by converting the electromagnetic wave information according to a certain rule.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of the authenticity determination system of the present invention, and FIG. 2 shows the configuration of a recording medium used in the authenticity determination system. Further, FIG. The waveform of the electromagnetic wave obtained by irradiating the same with the electromagnetic wave is shown in FIG.

The authenticity determination system of the present invention is a recording medium 1
0, an electromagnetic wave irradiation device 20, and a reading device 30. The reading device 30 includes an electromagnetic wave detector 31, an amplifier 32, and an A / D.
It is composed of a converter 33 and a CPU 34.

The electromagnetic wave emitted from the electromagnetic wave irradiation device 20 is irradiated onto the recording medium 10 and then reflected and detected by the electromagnetic wave detector 31. The detected electromagnetic wave is amplified by the amplifier 32, converted into a digital signal by the A / D converter 33, and converted into C
It is input to PU34. Further, individual information of the recording medium 10 is recorded in the CPU 34. Electromagnetic wave irradiation device 20
The structure is not particularly limited as long as it can generate electromagnetic waves.

An example of the layer structure of the recording medium 10 used in the present invention is shown in FIG. The electromagnetic wave absorption layer 2, on the base material 1,
The electromagnetic wave reflection layer 3, the masking layer 4, and the protective layer 5 are sequentially provided. When the electromagnetic wave is irradiated from the protective layer 5 side, the electromagnetic wave passes through the protective layer 5, a part is reflected by the electromagnetic wave reflecting layer 3, and the other part is directly absorbed by the electromagnetic wave absorbing layer 2.

An example of the waveform of the reflected electromagnetic wave is shown in FIG. In the figure, the vertical axis represents the electromagnetic wave intensity, and the horizontal axis represents the scanning direction.

The authenticity of the recording medium is judged by comparing the electromagnetic wave information of the recording medium 10 obtained from the electromagnetic wave absorbing layer 2 and the electromagnetic wave reflecting layer 3 with the medium individual information stored in the CPU 34. Determine false. If the determination is within the preset range of closeness, the recording medium is determined to be true.

The medium individual information is stored in the reading device as digital information obtained by converting electromagnetic wave information according to a certain rule.
Increases security. As a rule for converting into digital information, for example, a signal divided into a large number of sub areas,
There are methods such as binarization at a certain slice level or conversion into several hierarchical values.

The CPU 34 stores individual information of a plurality of recording media. The method of collating the electromagnetic wave information obtained from the recording medium 10 with the medium individual information stored in the CPU 34 is not particularly limited. For example, there is a method of giving an identifiable signal to each recording medium used and reading the medium individual information corresponding to the signal, or a method of searching all the stored medium individual information at high speed.

The structure of the recording medium will be described. The substrate used in the recording medium of the present invention is a plate, a sheet, or a film, and its material is paper, polyvinyl chloride, polyethylene, polypropylene, polyimide, polyester, polycarbonate, nylon, Plastics such as acrylic resin, metals such as copper and aluminum, and papers such as impregnated paper and synthetic paper can be used alone or in combination as a composite.

The electromagnetic wave absorbing layer usually contains a component that absorbs electromagnetic waves of 1 to 5 GHz. For example, carbon black, an electromagnetic wave absorbing dye dispersed in a binder,
Examples include resins and pigments having high electromagnetic wave absorption. Further, among the non-magnetic metals, those capable of absorbing electromagnetic waves in the above range may be used.

The electromagnetic wave reflection layer can be obtained by vapor deposition or sputtering of a non-magnetic metal, or by coating an ink in which a substance having a high electromagnetic wave reflectance is dispersed in a binder. Further, it may be formed by transferring an ink layer of an electromagnetic wave reflecting substance.

When an evaporation method or a sputtering method is used to form an electromagnetic wave reflection layer having a plurality of different patterns, a plurality of masking materials having different patterns may be provided on a base material to perform evaporation or sputtering. In addition, the point is a design,
It is composed of lines, characters, marks, and other arbitrary figures, and its shape is not particularly limited.

When a coating method using ink or the like is used, plates having different designs may be combined. For example, after printing a design on the left side of the base material, a method of sequentially printing different designs from the left side to the right side without overlapping with the design, a method of printing a design and then repeatedly printing different designs on the design, After printing an arbitrary number of designs at predetermined intervals, different designs are repeatedly printed without overlapping the designs, and the predetermined intervals are filled with the designs.

As the pigment having a high electromagnetic wave reflectance, pearl pigment, calcium carbide, titanium oxide, indium oxide and the like can be used. The binder is ethyl cellulose,
Cellulose derivatives such as cellulose acetate, polystyrene,
Styrene resin such as poly-α-methylstyrene, acrylic or methacrylic resin such as polyethyl acrylate and polymethyl methacrylate, rosin ester resin such as rosin and polymerized rosin, polyvinyl acetate resin, vinyl chloride resin, polyester resin , Polyurethane resin, butyral resin, vinyl chloride vinyl acetate copolymer resin, vinyltoluene resin and the like.

The binder is selected according to the printing method,
If necessary, a plasticizer and other additives can be used. Further, instead of the pigment, Zn, Pb, Bi, Al, I
It is also possible to use an ink composed of a metal such as n, Sn, or Te, an alloy thereof, a compound, or an organic dye.

The concealing layer is a mixture of organic and inorganic pigments such as process inks, leuco black dyes, carbon blacks and the like, which transmit electromagnetic waves and absorb visible light, in the same binder as described above in an appropriate ratio. It is formed by the ink and the like. Further, electromagnetic wave absorbing dyes such as anthraquinone type, aminium type, polymethine type, diimonium type, cyanine type and organometallic complex type may be mixed.

A method of manufacturing the recording medium used in the present invention will be specifically described. FIG. 4 shows an example of a schematic diagram of an offset printing machine used for manufacturing the recording medium used in the present invention, FIGS. 5 to 7 show the structure of a plate cylinder described later, and FIGS.
0 shows a plurality of different symbols formed using the plate cylinder shown in FIGS.

An electromagnetic wave absorbing layer 2 having a thickness of 1 μm was coated on the entire surface of a card with an ink containing carbon black on a polyester film substrate 1 having a thickness of 188 μm.

On the electromagnetic wave absorbing layer 2, an electromagnetic wave reflecting layer 3 having a plurality of different patterns of 2 μm was formed by using titanium oxide ink. The method of forming the pattern will be described later. On the electromagnetic wave reflecting layer 3, an ink containing an organic black dye, a color developer and an electromagnetic wave absorbing dye is applied to form a concealing layer 4 of 6 μm.
Formed.

Further, a solution in which a vinyl chloride-vinyl acetate copolymer was dissolved was applied onto the concealing layer 4 to form a protective layer 5 having a thickness of 2 μm.

In the offset printing machine shown in FIG. 4, for example, an infeed roll 200 for supplying a substrate 100 to be printed, an outfeed roll 300 for winding the substrate 100, an infeed roll 200 and an outfeed roll 300. Between the impression cylinder 400, the infeed roll 200, the outfeed roll 300, and the impression cylinder 40.
A drive system (not shown) for driving 0 and 0 is provided.

Blanket rolls 500, 600, 700, 800 are sequentially provided facing the impression cylinder 400. Opposed to the blanket roll 500, a plate cylinder 510 having a later-described plate is provided.

Further, facing the plate cylinder 510, the plate cylinder 51
0 is provided with an ink roll 520 for supplying ink,
An ink pan 530 for supplying ink is provided below the ink roll 520. Blanket roll 60
0,700,800 are also plate cylinders 610,710,81
0, ink rolls 620, 720, 820 and ink pans 630, 730, 830 are provided.

The ink roll 520 comes into contact with the ink stored in the ink pan 530, and then transfers the ink to the plate provided on the plate cylinder 510. Further, the ink transferred to the plate is transferred to the blanket roll 500, and a pattern is drawn on the blanket roll 500.

On the other hand, the material to be printed 100 is supplied from the infeed roll 200 and moves on the surface of the impression cylinder 400. The blanket roll 500 rotates and the design is transferred to the printing target 100. Similarly, the plate cylinders 610, 7
The design of the plate provided in 10, 810 is transferred from the blanket rolls 600, 700, 800 to the printing medium 100.

A method of forming an electromagnetic wave reflection layer having a plurality of different patterns will be described. After printing the pattern on the left side of the base material,
FIG. 5 shows a configuration of a plate cylinder used in a method of printing different designs sequentially from the left side to the right side without overlapping the designs.

The plate cylinder 510 is divided into four equal parts in the width direction, and the plates 501, 502, and 503 are circumferentially provided from the right end to the right quarter. The plate cylinder 610 is 1/4 right in the width direction.
From the center to the center, the illustrations 601 to 604 are provided in a circumferential shape. The plate cylinder 710 is provided with the plates 701 to 705 in a circumferential shape from the center to the right 3/4 in the width direction.
Is from right 3/4 to left end in the width direction.
6 are provided circumferentially. The size of all the plates is the same, and the ratio of the diameter of the plate cylinder is 3: 4: 5: 6. A part of the obtained pattern is shown in FIG.

The obtained pattern is a pattern in which four different symbols are arranged continuously in the longitudinal direction from left to right in the width direction, and if the symbols are cut, the symbols match. A recording medium having an electromagnetic wave reflection layer composed of a plurality of different patterns, which is composed of a non-designed group, is obtained.

FIG. 6 shows the structure of a plate cylinder used in a method of printing different designs repeatedly after printing the designs. Illustrations 501 to 503 are provided on the plate cylinder 510 in a circumferential shape. Similarly, the plates 601 to 6 are displayed on the plate cylinder 610.
04 are provided circumferentially, and the plate 710 has plates 701-7.
05 are provided circumferentially, and the plate cylinder 810 further includes the plate 8
01 to 806 are provided circumferentially. The size of all the plates is the same, and the ratio of the diameter of the plate cylinder is 3: 4: 5: 6. A part of the obtained pattern is shown in FIG.

By cutting the pattern shown in FIG. 9 in the width direction, a recording medium having an electromagnetic wave reflection layer composed of a plurality of different patterns in which a plurality of patterns are overwritten can be obtained.

After printing an arbitrary number of patterns at predetermined intervals,
FIG. 7 shows the structure of a plate cylinder used for a method of printing different patterns repeatedly without overlapping the patterns and filling the predetermined intervals with the patterns. The plate cylinder 510 has three plates 501, 502, 503 at equal intervals on the surface. The plate cylinders 610, 710, and 810 are also arranged at equal intervals in the plates 601 to 604, 701 to 705, and 801 to 80.
6 is provided. The ratio of the diameters is 3: 4: 5: 6 so that the distance between the plates is the same. The diameter of the blanket roll is the same as the diameter of the opposite plate cylinder. If the number of symbols provided on each plate cylinder is 3, 4, 5, 6 then 60 patterns can be obtained. A part of the obtained pattern is shown in FIG.
Shown in

When the pattern shown in FIG. 10 is cut into a group of symbols composed of four different symbols, it has an electromagnetic wave reflection layer composed of a plurality of different symbols composed of a group of symbols which do not match each other. A recording medium is obtained.

The recording medium used in the authenticity determination system of the present invention is composed of an electromagnetic wave absorbing layer and an electromagnetic wave reflecting layer composed of a plurality of different patterns, and information recorded in the reading device is a preset approximation. Since the authenticity of the recording medium is determined to be true when it is within the range of the sex, the security function is superior to a system in which these two types of information are independent and unrelated.

Further, the information stored in the recording medium is difficult to imitate because the patterns formed on the electromagnetic wave reflecting layer are a plurality of different patterns. Further, since the shielding layer for shielding visible light is provided, the electromagnetic wave absorbing layer and the electromagnetic wave reflecting layer cannot be visually recognized, so that the security performance is improved.

[0040]

As described above, since the authenticity determination system of the present invention has a plurality of security means,
Forgery or alteration can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an outline of a true / false determination system of the present invention.

FIG. 2 shows an example of a layer structure of a recording medium used in the authenticity determination system of the present invention.

3 shows a waveform of reflected light obtained by irradiating the recording medium shown in FIG. 2 with an electromagnetic wave.

FIG. 4 shows an example of a schematic view of an offset printing machine used in the present invention.

FIG. 5 shows an example of the structure of a plate cylinder.

FIG. 6 shows an example of a configuration of a plate cylinder different from that of FIG.

FIG. 7 shows an example of the configuration of a plate cylinder different from those in FIGS. 5 and 6.

FIG. 8 shows a pattern obtained by using the plate cylinder shown in FIG.

FIG. 9 shows a design obtained by using the plate cylinder shown in FIG.

FIG. 10 shows a pattern obtained by using the plate cylinder shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Electromagnetic wave absorption layer 3 Electromagnetic wave reflection layer 4 Concealment layer 5 Protective layer 10 Recording medium 20 Electromagnetic wave irradiation device 30 Reader

Claims (2)

[Claims] 1. A genuineness / counterfeit determination system having a recording medium having at least an electromagnetic wave absorbing layer and an electromagnetic wave reflecting layer having a plurality of different patterns, a reading device for reading the recording medium, and an electromagnetic wave irradiation device, wherein: The reading device stores medium individual information that correlates with electromagnetic wave information detected by irradiating the recording medium with electromagnetic waves emitted from the electromagnetic wave irradiating device, and records with the medium individual information stored in the reading device. An authenticity determination system characterized by determining authenticity of a recording medium by comparing the electromagnetic wave information detected by irradiating the medium with electromagnetic waves. 2. The authenticity determination system according to claim 1, wherein the medium individual information is stored in a reading device as digital information obtained by converting the electromagnetic wave information according to a certain rule.