JPH07237380A - Authenticity decidable printed matter and method for deciding authenticity thereof - Google Patents

Abstract

PURPOSE:To easily decide authenticity by a simple method even when printed matters such as banknote, bond, check, ticket, credit card, other deeds or the like are formed with a copier or the like. CONSTITUTION:An authenticity decision part 4 made of electrically conductive ink 3 is formed on paper base 2 by normal printing system. By energizing the authenticity decision part 4 and an electrical circuit integrally through the semultaneous contact of two electrodes of a decider, which is formed by connecting the electrodes by the predetermined intervals with both the end parts of an electrical circuit connecting with power source and a continuity displaying means, the authenticity is easily decided with the continuity displaying means connected in the circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter which can be verified as authenticity, and more specifically, a certificate such as banknotes, securities, checks, tickets, or printed matter such as a credit card, which is counterfeit printed or copied. The present invention relates to a printed matter which can be easily detected by a simple authenticity judging method even if it is forged by a machine.

[0002]

2. Description of the Related Art In recent years, due to the rapid improvement in performance of color printers and copiers, the range of resolution or contrast adjustment has been significantly improved and expanded, making it difficult to identify a copy forgery at a glance. Further, with the spread of these copying machines, it has become possible for anyone to easily forge or alter certificates and the like. Therefore, as a conventional anti-counterfeit measure, the quality of the paper and the printing method are devised,
For example, a watermark or paper is put on the paper, a ground pattern printing that uses a gradation pattern or moire effect in the printed pattern, or a visual judgment method such as incorporating a fine pattern, or magnetic ink reading using magnetic ink There has been proposed a mechanical method of making a judgment by an apparatus, or a method of making a visual judgment by using an ultraviolet irradiation apparatus and visualizing a pattern by an ultraviolet irradiation apparatus, and making a judgment by using a combination of visual and mechanical.

[0003]

However, in the above-mentioned conventional method, for example, it is difficult to select and adjust the printing ink by the visual judgment method.
It is necessary to print complicated characters such as background pattern and color pattern on the cover after printing characters and patterns on the latent image part and background part. Since it is possible, authenticity is usually judged by visual inspection using a magnifying glass, a microscope, etc., and the judgment requires skill. Further, the conventional mechanical discrimination method requires a special and expensive device such as an ultraviolet irradiation device and a magnetic ink reading device, and these devices also have a problem that they are not easy to handle in terms of size and weight.

In view of such a problem, according to the present invention, even if the printing form is forged by a copying machine or the like, the judge can easily judge the forgery by using the judging device having a simple structure and good handling property. Further, it is an object of the present invention to provide a printed matter that cannot be easily visually recognized by a special treatment performed for authenticity determination.

[0005]

In order to achieve the above-mentioned object, in the printed matter of the present invention, an authenticity judging section made of a conductive ink is formed on a paper substrate by a usual printing method, and this judging section is provided with a power source. And an electric circuit to which the continuity display means is connected, and two electrodes of a judging device having electrodes connected to both ends of the circuit at predetermined intervals are simultaneously brought into contact with each other to connect the authenticity judging unit and the electric circuit. The authenticity can be easily determined by the continuity display means which is energized as a unit and connected in the circuit. In addition, the dummy of the authenticity determination part is printed with normal printing ink, or has conductivity,
In addition, by forming the authenticity determining portion with transparent ink, it is difficult for an abuser who does not know the position of the determining portion to identify or visually recognize it. That is, when a conductive ink mixed with a colored ink is prepared on the paper substrate and the authenticity determination portion is printed,
A dummy is printed on the same paper substrate in another appropriate place with normal ink of the same form and color as the authenticity judgment part to make it difficult to identify the position of the authenticity judgment part with the naked eye, or the unprinted part or already printed Achieves the intended purpose by providing a printed matter in which an authenticity judgment portion which does not adversely affect the printed portion and which is invisible to the naked eye is formed by overcoating a transparent portion with a conductive transparent ink. It is a thing.

[0006]

The conductive ink is printed on a paper substrate by a usual printing method to form a conductive authenticity judgment part, and the judgment part and the electric circuit are integrated by contacting two electrodes of the judgment device. If the printed matter is genuine, the authenticity determination section is electrically conductive, so the continuity display means connected in the circuit reacts, while if the printed matter is a fake, the authenticity determination section is an insulator. Therefore, the continuity display means does not react, and therefore the judge can judge the authenticity by the presence or absence of the continuity display. Furthermore, by printing a dummy of the authenticity determination part, or by printing the authenticity determination part with a conductive and transparent ink, the position of the authenticity determination part can be identified with the naked eye, or itself. Is difficult to see. Moreover, since the number of constituent elements of the judging device is small and the structure thereof is very simple, it is possible to manufacture a judging device which is inexpensive and has excellent handling properties in terms of size and weight.

[0007]

The present invention will be described in detail below based on preferred embodiments. In this embodiment, as shown in FIG. 1 and FIG. 2, the authenticity judgment is performed with the conductive ink 3 along the left side of the paper base 2 of the gift certificate 1 which is an embodiment of the authenticity judgment printed material of the present invention. The copy 4 is to be printed.
On the other hand, along the right side of the paper base 2, a dummy 5 of the same shape and color as the authenticity determination section 4 is printed with ink containing no conductive agent, and the naked eye can distinguish between the authenticity determination section 4 and the dummy 5. It is something that should not be done.

The conductive ink in the present invention may be a low resistance type colored conductive ink using a magnetic inorganic pigment such as iron oxide, but more preferably, an oxide of tin and indium, that is, ITO (Sn
/ In ₂ O ₃ ) It is preferable to use an ultrafine powder dispersed in an ink resin vehicle to form an ink. this is,
The specific resistance value of this ITO ultrafine powder is 10 ⁻¹ to 10 ⁻⁴ Ω
・ Since the resistance value is much lower than that of the conventional magnetic inorganic pigments such as iron oxide at about cm, by converting the ITO ultrafine particles with such a low resistance value into an ink, it becomes a normal conductive ink. In comparison, not only a conductive ink whose resistance value is remarkably suppressed can be obtained, but also a material obtained by uniformly dispersing the ITO ultrafine powder having a particle diameter of 0.1 μm or less has transparency. Therefore, by incorporating this in a transparent resin vehicle, it is possible to prepare a transparent ink having conductivity. Therefore, in the present invention, when the ITO conductive ink is used, it is possible to obtain the authenticity judging section having excellent conductivity even if the coating amount is reduced as compared with the usual conductive ink, or This has the effect of reducing the voltage / capacity of the power supply of the judging device. Further, either a colored ink containing a usual dye or pigment or a transparent ink prepared with a transparent resin vehicle can be arbitrarily selected.

For example, when the ITO conductive ink is printed on the paper substrate 2 with a coating thickness of 1.0 μm, the authenticity determining portion 4 having a surface resistance value of about 1.2 × 10 ³ Ω / □ is obtained, or When printing is performed with a coating thickness of 2.5 μm, it is possible to obtain an authenticity determination portion having a surface resistance value of 5.5 × 10 ² Q / mouth. Alternatively, when a transparent ITO conductive ink is printed with a coating thickness of 1.0 μm, the surface resistance value is 1.5 × 10 ³ Ω.
It is possible to obtain a transparent and transparent authenticity judging portion having a / mouth and a haze value of about 1.5%. Further, in this case, the dummy is not necessary because the authenticity determination unit itself cannot be visually recognized.

In the present invention, the authenticity determination unit 4 is
Printing is carried out by a usual method such as an offset method or a gravure method, but it is most suitable to print on a paper substrate by using a screen method capable of adjusting the ink buildup in a wide range. The printing form is not limited to solid, and may be formed with a tint block or the like. Therefore, for example, the tint block part such as the title of the gift certificate 1 and the amount column may be formed with the conductive ink 3.

Next, a method of judging the authenticity of the printed matter will be described. As shown in FIG. 3, in the present embodiment, the judge judges the power supply 7 connected in the circuit, the judgment lamp 8 as the continuity display means, and the judgment device 6 composed of the electrodes 9 at both ends of the circuit. The principle of the determination is that if both electrodes 9 of the determination device 6 are simultaneously brought into contact with the authenticity determination section 4 provided at a proper position of the gift certificate 1, if the gift certificate 1 is a genuine circuit. However, if the gift certificate 1 is a fake, the circuit does not conduct and the determination lamp 8 does not light. Therefore, the judge can judge the authenticity of the gift certificate 1 by visually checking whether or not the judgment lamp 8 is turned on.

Furthermore, since the resistance value changes by changing the length of the image pattern or the coating thickness of the authenticity judging section, it is possible to change the length of the image pattern or the coating thickness by applying a constant voltage. A specific current value is obtained corresponding to the corresponding specific resistance value. Therefore, in this case, if an ammeter or the like is used as the continuity display means, the ID of the printed matter due to the change of the current value can be checked at the same time as the authenticity determination. In the present invention, the power source may be either a DC power source or an AC power source, but a DC power source is preferable in order to simplify the configuration of the determiner.

[0013]

According to the present invention, the authenticity judging portion can be easily formed by a normal printing method, and the judge judges that the authenticity judging portion of the printed matter is in contact with both electrodes of the judging device and energized together with the electric circuit. The authenticity can be determined very easily only by confirming the conduction state by the conduction display means.
Then, when the authenticity determination portion is printed with a colored conductive ink, a dummy of the same form and color as the authenticity determination portion is printed, or by printing the authenticity determination portion with a transparent conductive ink, With the naked eye, it is difficult to identify the position of the authenticity determination part, or to visually recognize it,
Therefore, it becomes very difficult for an abuser to forge the authenticity determination unit. Furthermore, since the number of constituent elements of the judging device is small and the structure thereof is very simple, it is possible to create a judging device that is inexpensive and has excellent handleability in terms of size and weight, and has a merit in cost. In addition, there is an effect that the place to be judged is not limited.

[Brief description of drawings]

FIG. 1 is a plan view of a gift certificate which is a printed matter according to the present invention, which is capable of authenticity determination.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic view of a state in which an electrode of a discriminator is in contact with an authenticity determination unit to determine authenticity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gift certificate which is a printed matter capable of authenticity judgment 2 ... Paper base 3 ... Conductive ink 4 ... Authentication judgment part 5 ... Dummy 6 ... Judgment device 7 ... Power supply 8 ... Conductive display means 9 ... Electrode

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Claims (4)

[Claims] 1. A printed matter capable of authenticity determination, comprising an authenticity determination section made of conductive ink printed at a predetermined position on a paper substrate. 2. The printed material capable of authenticity judgment according to claim 1, wherein the conductive ink has transparency. 3. The conductive ink is an ink obtained by dispersing ultrafine powder of tin and indium oxide in a resin vehicle for ink to form an ink. Thru | or the printed matter which can be verified as the authenticity of Claim 2. 4. An electric circuit in which a power source and a continuity display means are connected, and a determiner in which electrodes are connected to both ends of the circuit with a predetermined interval, and an electric circuit is provided. When the two electrodes of the circuit are simultaneously brought into contact with the authenticity determination portion formed on the paper substrate of the printed matter capable of authenticity determination according to the third paragraph, and the authenticity determination portion and the electric circuit are energized as a unit. An authenticity determination method for a printed material, which is capable of authenticity determination, characterized in that the authenticity is determined based on the conduction state of.