JP2002029137A - Method for judging genuineness of affixed seal in vermillion seal ink, genuineness judging device, and seal for judging genuineness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly judge genuineness by distinguishing whether a seal is affixed in a vermilion seal ink or is printed by a printer. SOLUTION: It is distinguished whether the ink used is the vermilion seal ink or an ink by an ink jet printer, by ascertaining the color fading characteristics of the ink with the use of an aqueous hypochlorous acid solution. Thus the genuineness of the affixed seal is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an authenticity judging method, an authenticity judging device and an authenticity judging seal for judging authenticity of a vermilion imprint.

[0002]

2. Description of the Related Art Unlike the European and American signature cultures, in Asian countries such as Japan, personal authentication security using a seal has been used for a long time. The use of seals varies from the level of approval used to receive luggage to the level that requires high security such as certificates of public institutions, contracts such as sales and purchases, and bank transactions. In particular, in bank transactions, it is often related to high-value transactions such as deposit withdrawal using a passbook, and the security value of the seal is extremely high. In such authenticity verification of a seal, a judgment as to whether or not the registered seal is in agreement with the seal is currently made visually or electronically.

[0003]

Such a seal culture is based on the premise that a seal cannot be forged. However, with the recent increase in the performance of OA devices, particularly scanners and printers, it has become possible to read and print imprints electronically even at the home level.
2. Description of the Related Art Ink jet printers are rapidly spreading because they can print high-quality images comparable to photographs at low cost.

[0004] Since the current seal check only performs geometric check, if the same figure is the same figure, it is determined that they match, irrespective of whether they are truly stamped or printed by a printer. I will. For this reason, a means for discriminating “whether by imprinting or printing by a printer” is required in addition to the conventional geometrical matching, but there has been no practical method so far.

[0005] Forgery of an imprint, forgery by an electrophotographic printer or a thermal transfer printer can be considered, but printing by these printers differs from vermilion imprinting in that gloss is generated on the surface, so that the authenticity can be judged by the naked eye. . However,
In an ink jet printer, since such surface gloss does not occur, it is difficult for the naked eye to judge the authenticity.

SUMMARY OF THE INVENTION An object of the present invention is to determine whether printing is performed by imprinting or printing by a printer, and to reliably determine authenticity.

[0007]

SUMMARY OF THE INVENTION The present invention uses an aqueous solution of sodium hypochlorite to determine whether the used ink is vermilion ink or ink for an ink jet printer based on its fading characteristics. Is determined. A further invention is a device for determining the authenticity of a vermilion imprint, comprising a concentration measuring section and a sodium hypochlorite aqueous solution application section.

[0008] A further invention is a seal for determining the authenticity of a vermilion imprint, wherein sodium hypochlorite is adhered to a sheet substrate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment In an experiment, a vermilion (manufactured by Tsukahara Kogyo Co., Ltd.) and an ink jet printer manufactured by Company A and B
An inkjet printer manufactured by the company was used. For the measurement of the concentration, a color meter manufactured by Sakata Inx was used.

[0010] Sodium hypochlorite is dissolved in pure water.
A 7% aqueous solution was prepared. Using a vermilion, A and B ink jet printers, a 10 mm diameter soaked circle was printed in vermilion on high quality paper to obtain a print sample. After measuring the color densities of the three types of print samples on a magenta base using a color meter, the adjusted sodium hypochlorite aqueous solution was applied. The color change one second after the application was measured again on a magenta basis. Table 1 shows the results.

[0011]

[Table 1]

As shown in the table, the application of the aqueous solution of sodium hypochlorite did not affect the vermilion printing, but it was found that the dye was quickly faded in the ink jet printer. This is because the vermilion ink is an inorganic substance, whereas the ink of the ink jet printer is an organic substance and is decomposed by sodium hypochlorite.

Thus, by applying the aqueous solution of sodium hypochlorite, the authenticity of vermilion could be determined. Second Embodiment FIG. 1 is a front view showing a configuration of a second embodiment of the present invention,
FIG. 2 is a cross-sectional view of the same.

The apparatus includes a photometric unit 1 for measuring the ink density of a paper printing unit, a coating unit 3 for coating a test liquid with a coating roller 2, and a processing unit 4 for controlling equipment and performing data processing.
Consists of Here, a color meter manufactured by Sakata Inx Co., Ltd. is used for the photometric unit 1, and the photometric unit 1 is set to a measurement mode in magenta in advance. Sodium hypochlorite was dissolved in pure water to prepare a 17% aqueous solution.
It is stored in the test liquid storage unit 5.

Reference numeral 6 denotes a transport roller for transporting the test paper, 7 a test paper insertion slot for inserting the test paper, and 8 a power supply. Reference numeral 9 denotes an indicator provided on the front of the apparatus, and displays an authenticity detection result. In the experiments, as in the first embodiment, vermilion (manufactured by Tsukahara Kogyo) and ink jet printers manufactured by A company,
An inkjet printer manufactured by the company was used. Using a vermilion ink jet printer manufactured by Company A and an ink jet printer manufactured by Company B, a solid circle having a diameter of 10 mm was printed in vermilion on high-quality paper to obtain a test paper as a sample.

The test paper thus prepared was inserted into the test paper insertion slot 7. The apparatus first measures the density initial value on the magenta base by the side light unit 1. After the measurement, the test paper is further transported, and the test solution is applied by the application roller 2. One second after the application, the test paper is reversely conveyed and conveyed again to the photometric unit 1. Here, the density measurement on the magenta base is performed again.

The concentration measurement result data before and after the application of the test liquid is as follows:
The test solution is sent to the processing station 4, where it is determined whether the concentration of the test solution has decreased due to application. Here, 50 before and after application of the test solution
When the density change was not less than 50%, the red indicator was turned on, and when the density change was less than 50%, the blue indicator was turned on. Here, the display means may be a sound notification system other than the display by the indicator 9.

[0018]

[Table 2]

Table 2 shows the results of the determination by the authenticity determination device. It can be seen that the blue indicator is lit on vermilion test paper and the red indicator is lit on printer test paper. As described above, the authenticity of vermilion was able to be determined by the apparatus for applying the aqueous solution of sodium hypochlorite with the roller and comparing the concentrations before and after the application.

Third Embodiment FIG. 3 is a front view showing the structure of the third embodiment, and FIG. 4 is a cross-sectional view of the same. The apparatus comprises a photometric unit 1 for measuring the ink density of a paper printing unit, an application unit 30 for spraying and applying a test liquid, and a processing unit 4 for controlling the equipment and performing data processing. Here, a color meter manufactured by Sakata Inx Co., Ltd. is used for the photometric unit 1, and the photometric unit 1 is set to a measurement mode in magenta in advance.

Sodium hypochlorite is dissolved in pure water,
A 7% aqueous solution was prepared and placed in a test liquid storage section 5 as a test liquid. Reference numeral 6 denotes a transport roller for transporting the test paper, reference numeral 7 denotes a test paper insertion slot for inserting the test paper, and reference numeral 8 denotes a power supply. 9 is an indicator provided on the front of the device,
Displays the authenticity detection result.

In the experiment, as in the case of the first embodiment, vermilion (manufactured by Tsukahara Kogyo) and ink jet printers manufactured by A and B were used as the ink jet printers. Using a vermilion ink printer manufactured by Company A and an ink jet printer manufactured by Company B, a filled circle having a diameter of 10 mm was printed in vermilion on high-quality paper to obtain a test paper as a sample.

The test paper thus prepared was inserted into the test paper insertion slot 7. In the apparatus, first, the photometric unit 1 measures a density initial value on a magenta basis. After the measurement, the test paper is further transported, and the test solution is applied by the test solution spraying unit 31. One second after the application, the test paper is reversely conveyed and conveyed to the side light unit 1 again. Here, the density measurement on the magenta base is performed again. The concentration-side fixed result data before and after the application of the test liquid is sent to the processing unit 4, where it is determined whether or not the concentration has decreased due to the application of the test liquid. Here, when there is a concentration change of 50% or more before and after the application of the test solution, the red indicator lights up,
When the change in density was less than 50%, the blue indicator was set to light.

Here, similarly to the above, the display means may be a sound notification system other than the display by the indicator 9.

[0025]

[Table 3]

Table 3 shows the results of such determination by the authenticity determination device. It can be seen that the blue indicator is lit on vermilion test paper and the red indicator is lit on printer test paper. As described above, the authenticity of vermilion was able to be determined by the apparatus in which the aqueous solution of sodium hypochlorite was applied by spraying and the concentration before and after the application was compared.

Fourth Embodiment Cyanoacrylate as an adhesive and sodium hypochlorite prepared in the first embodiment are mixed at a weight ratio of 19: 1, and the mixture is mixed with a polystyrene sheet. Coated on vinylidene fluoride film. The thus prepared seal containing sodium hypochlorite was attached to the three types of print samples manufactured in the first embodiment, and the color change before and after that was measured. Table 4 shows the measurement results.

[0028]

[Table 4]

As shown in the table, when the seal containing sodium hypochlorite was attached, the printing of vermilion was not affected, but it was found that the dye was quickly faded by the ink jet printer. Here, the print density was slightly increased in the vermilion printing because the surface reflection was increased by sticking the seal. As described above, by authenticating sodium hypochlorite, the authenticity of vermilion could be more easily determined.

The sheet substrate is not limited to the above-mentioned film, but may be any other material suitable for use. The method of attaching sodium hypochlorite is selected according to the type of the material, and the coating is performed. There is application by a sprayer or by a brush, and it can also be performed by dipping, and the adhesion state includes surface adhesion and impregnation. According to the first to fourth embodiments described above, it can be seen that the authenticity of the seal can be easily determined at the counter of the bank. Also,
It can be used in a wide variety of documents that require various types of seals, such as applications at government offices and contracts at service institutions, as well as bank counters.

[0031]

According to the present invention described in detail above, it is determined whether the used ink is vermilion ink or ink of an ink jet printer by using the aqueous solution of hypochlorous acid and its fading characteristics, and thereby, the imprinting of the stamp is performed. Since the authenticity is determined, it is possible to reliably determine whether the seal is imprinted or printed by a printer.

Further, according to the vermilion stamp authenticity determination device provided with the concentration measuring section and the sodium hypochlorite aqueous solution application section, there is an effect that it is possible to automatically determine whether the stamping or the printing by the printer is performed. . Further, according to the seal for judging the authenticity of the vermilion imprint, which is characterized by being impregnated with sodium hypochlorite, there is an effect that the imprint or the printing by the printer can be more easily and reliably determined.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a second embodiment.

FIG. 2 is a cross-sectional view showing a configuration of a second embodiment.

FIG. 3 is a front view showing the configuration of a third embodiment.

FIG. 4 is a cross-sectional view showing the configuration of the third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photometry section 2 coating roller 3 30 coating section 4 processing section 5 test liquid storage section 6 transport roller 7 test paper insertion port 8 power supply 9 indicator

Claims (5)

[Claims] 1. A method for judging the authenticity of a vermilion imprint, characterized by using an aqueous solution of sodium hypochlorite to determine the color fading characteristics. 2. An authenticity judging device for a vermilion imprint, comprising a concentration measuring section and a sodium hypochlorite aqueous solution applying section. 3. The authenticity judging device for a vermilion imprint according to claim 2, wherein an application roller is used in an application portion of the aqueous solution of sodium hypochlorite. 4. The authenticity judging device for a vermilion imprint according to claim 2, wherein a sprayer is used in an application portion of the aqueous solution of sodium hypochlorite. 5. A seal for judging the authenticity of a vermilion imprint, wherein sodium hypochlorite is adhered to a sheet substrate.