JPS58134782A - Printed material for verification - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to printed matter for verification.

BACKGROUND ART Conventionally, printed materials such as banknotes, securities, and horse racing tickets have been used with openwork of specific symbols and figures to prevent counterfeiting, and embossing techniques have been used as a processing method.

However, although such openwork has the advantage that anyone can easily see through it and determine the authenticity of banknotes and securities, it is also easy to forge, and it can also be used for specific purposes. has some disadvantages. For example, personal signatures and stamps on verification cards used in place of passbooks at banks and post offices, or credit cards used for credit sales at stores, etc., are not openwork but are usually hidden and cannot be filtered through a specific filter. What is desired is something that can be visually recognized and verified by use. Conventionally, as such a verification method, verification prints printed with two or more types of ink that have similar color tones in the visible light range and differ in reflectance in the wavelength range of 650 or more plates are used for 6 FI Onm.
A method of recognizing patterns with differences in reflection density by viewing through a filter that transmits only the wavelengths above (
(Sho 46-2F1288), and the signature is written on the verification card with India ink or ink that does not transmit or reflect infrared rays, such as black ink for drafting, and a film that transmits only infrared rays is pasted on it with ramie cloth or a card. There is a method of concealing the upper signature and recognizing it with a verification device (Sho 47-30371). However, the former can be easily recognized with the naked eye through a red filter or red light irradiation, the difference in reflectance in the visible region and the density difference through the filter are small, and the ink color is limited to black or fruits and vegetables, making it impractical. In the latter case, the ink is limited to black, and therefore, the coating that completely adjoins it is only black or highly-concentrated coloring, which has the problem of greatly limiting its range of use.

The present invention was completed as a result of intensive research in order to overcome the problems of these conventional technologies, and it involves printing by selecting a conventional ink of the same color tone as an ink containing a specific pigment. Therefore, the hidden pattern printed with the specific ink cannot be identified with the naked eye even when using a filter or irradiating it with light.
It can only be identified by photographing it with a camera that is relatively sensitive to near-infrared rays in the 000 nm wavelength range and displaying it on a CRT, or by viewing it with an infrared pure, etc., and automatic verification is possible. The purpose of this invention is to provide a highly practical verification printed matter that is highly safe and can be used in any color tone.

That is, the present invention is characterized in that at least two or more types of ink layers of the same color tone having different near-infrared transmittances or reflectances are arranged side by side or laminated on a base material having near-infrared reflective ability. At least two or more types of ink layers of the same color tone with different near-infrared transmittances or reflectances are arranged or laminated on the reference print and a base material that has near-infrared reflecting ability, and then the near-infrared rays are transmitted. This is a printed material for verification, characterized in that it is covered with an overcoat layer to hide it, and furthermore, a printed layer that transmits near infrared rays is formed on the surface of the overcoat layer. .

The present invention was made due to the optical properties of pigments contained in printing ink, and some pigments have almost no difference in transmittance or reflectance compared to ordinary pigments (visible range ÷). But 700-1. There are some materials with large differences in transmittance or reflectance in the OOOnm near-infrared region. That is, a pigment that does not transmit or reflect light in the near-infrared region, and nJ
Viewing area Pigments that transmit or reflect near-infrared rays of 700 to 1.00 nm (l nm) while having the same transmittance or reflectance as the pigments are selected, and the ink obtained by blending these pigments is By printing a hidden pattern on the base material that is the printing material, a similar leopard-like pattern is made, which makes it impossible to identify it with the naked eye and can only be identified by near-infrared rays of 700 to 1.000 nm. Our goal is to provide the best printed materials possible.

Hereinafter, the present invention will be described in detail based on the drawings.

FIGS. 1 to 4 are cross-sectional views showing specific examples of the printed material for verification of the present invention, and FIG. 5 and FIG. It is a diagram.

In FIG. 1, A is 700 to 1. Ink layer that transmits or reflects near infrared rays of OOOnm, B is 700 to i, oo
o An ink layer that does not transmit or reflect near infrared rays and has the same color tone as the ink layer A, and ink layers of the same color tone of the two gods are arranged side by side on the base material 2. . The base material 2 can be any material used as a printing material, but specifically, paper, plastic sheet, plastic film, cloth, synthetic paper, ceramic board, etc. are preferable. Moreover, the base material 2 is 700-1. OOOnm
If the material is made of a material that reflects near-infrared rays, it can be used as is, but if the material is made of a material that transmits the near-infrared rays, it is necessary to form a reflective layer 1 or 1' on either the upper surface or the lower surface.

It is sufficient that the ink layer A and the ink layer B have a difference in near-infrared transmittance or reflectance, and the two are selected relative to each other.
1. It is not limited to those that do not transmit or reflect OOOnm near infrared rays.

The reference printed matter in FIG. 1 has the same color tone, so it appears to be a single color to the naked eye, but it is 700 to 1. When near-infrared rays of OOOnm are irradiated, there is a difference in transmittance or reflectance between ink layer A and ink layer B. When photographed or viewed using pure infrared light, the ink layer of B is bright and the ink layer of B is dark, resulting in a strong density difference.The hidden pattern of B is clearly recognized.

The pigment blended into the ink forming ink layer A is 700
Any material may be used as long as it has a high near-infrared transmittance or reflectance of ~1,000 nm. Specific examples include Penjijinero, Penjijinero G1 Carmine 6B.
, Daiki Red C, Bouchi Red D, Phthalocyanine Blue, Fast Sky Blue, Yellow Lead, Permanent Red 4R.

Ultramarine blue, phthalocyanine green, chromium oxide, etc. are used, but it is preferable to use lake pigments that do not have iron atoms, and other organic and inorganic pigments.

Pigment compounded in the ink forming ink layer B, 1, transmittance and reflection of near infrared rays from 700 to 1,000 nm, and reflection 4'. As long as the low value is 0, any child can be 0.Specific examples include carbon and pigments that generally have iron atoms, such as triiron tetroxide, red iron oxide, iron oxide, amber, and yellow oxide. Iron, ocher, naphthol green B N
(C, I, Pigment ()reen 12)
, Pigment Green-7B (C, 1, Pigment
Green 8), navy blue (C, engineering, 77F110.
C, 1,77F120), Chinamae, Brunswick Blue, Antwerp Blue, Chrome Green 2, Zinc Green, Alchemist, aluminum powder, metal powder such as bronze powder, and various other color tones are preferred.

The reflective material 1 can be any material as long as it reflects near-infrared rays and has an affinity with the base material. Specific examples include zinc oxide, basic lead carbonate, and basic sulfuric acid. Lead, lead sulfate, lithopone, zinc sulfate, titanium oxide,
White pigments such as antimony oxide, pallite powder, precipitated barium sulfate, barium carbonate, lime carbonate powder, precipitated calcium carbonate, gypsum, asbestos, clay, silica powder, diatom, talc, aluminum white, basic magnesium carbonate,
Extender pigments such as Gloss White 1 and Satin White, foamed films, foamed containers such as Foamed A and Nyuki, porous materials such as mixtures of talc and resin 11°, fibers, cellulose and its derivatives, and the above. Examples include the actual appearance of materials. Although any color tone of the reflective material can be used, it is particularly preferable that the color tone is the same as that of the base material or white.

Diagram 2 is a reference printed matter in which ink layer A is laminated on ink layer B, and Figure 3 is a printed matter in which ink layer A is laminated on ink layer A.
Figure 4 shows ink layer B of 700 to 1
．． The ink layer A is coated with ink layer A that transmits 000 nm of near-infrared rays without reflecting it.All of these inquiry prints have the same effect as the reference print shown in Figure 1, and the hidden patterns can be clearly seen. can be recognized.

Figure 5 shows a comparison print similar to Figure 1 in which ink layer A and ink layer B are placed side by side and then covered and hidden with an overcoat layer 3 that transmits near-infrared rays in the range of 700 to 1,000 nm. If near-infrared rays are irradiated, hidden patterns can be easily recognized using the above-mentioned camera or infrared pure.

Overcoat layer 3 is on top of ink layers A and B.
．． Formed by overcoating or pasting with a colorless or colored ink or film that transmits OOOnm near infrared rays, the first tone can be any color such as black, blue, green, yellow, red, white, etc. However, if a white material is used as a material, it is advantageous because any pattern can be printed on it, but on the other hand, the concealment of the hidden pattern on the base makes it difficult to use other colors. This problem can be solved by making the ink layer A and the ink layer B as equal in tone as possible and printing without gaps, although this is somewhat more difficult than in the case where the ink layer A and B are printed.

In addition, when white is used, by making the ink layer A and the ink layer B as light in color as possible, it is possible to obtain a state with a higher degree of whiteness.

FIG. 6 shows an overcoat layer 3 formed on the inks MA and B of FIG. ! ! 70 on the surface of 3
0-1. This is an inquiry printed material in which a printed layer 4 is formed by printing with an ink that transmits OOn nm near-infrared rays. The ink for printing 1-4 is 700-1. Any material may be used as long as it transmits near infrared rays of 1 m of OOOr.

Especially when using black as a color tone, carbon is used.
Stamped ink on the white overcoat layer 11
It is preferable to do so.

In FIG. 7, as in FIG. 3, an ink layer B is laid down on top of the ink layer A, and the layer is covered and concealed with a colored layer 5 made of colored ink that transmits near infrared rays.

In this case, if a base material with long near-infrared transmittance is used, the hidden pattern can be identified by looking through it, but in that case, a colored layer is formed on both sides of the base material, not just one side. It is necessary.

As mentioned above, all of the verification printed matter explained based on each drawing are 700 to 1. Hidden patterns can be clearly recognized using a camera sensitive to OOOnm near-infrared rays or pure infrared rays.

Forming Ink 1-A and B □ The amount of pigment added to the ink should be the amount that distinguishes the pattern □゛ The amount that is included in the stem and the song, and the specific amount varies depending on the type of pigment □ The density of the hidden pattern can be increased by adding a pigment that does not transmit or reflect near-infrared rays to the ink used for ink layer A, and printing ink layer B with it. can be adjusted.

In addition, the ink used in the present invention
Ink layer B uses ink of the same color to form a single color printing surface, but ink layer A of different colors is used.
The object of the present invention can be sufficiently achieved by forming a printed surface on which ink layer B is printed and performing multicolor printing without limiting the color printed on the substrate to a single color.

The verification printed matter of the present invention obtained in this manner has a specific seven
00-1. OO'Onm's hidden patterns can be identified only by near-infrared rays, making it extremely invisible.Also, hidden patterns such as letters and figures are hidden in single- or multi-colored printed matter. It has a wide range of applications and can be applied to ordinary printed matter.

1:,,: The present invention has such advantages, and further effects are listed below.

1) It cannot be easily recognized by women because it cannot be identified with visible light.

2) It is possible to form the toe pattern with printed layers of the same color tone with a large difference in near-infrared transmittance or reflectance, so the hidden pattern can be identified very clearly 03) Two or more types of ink of the same color tone Because the difference in density appears very large, it is recommended to display a hidden pattern printed small in advance or a detailed pattern such as a fingerprint on a CRT by enlarging it, and to use a continuous tone pattern for the hidden pattern. It is Noh.

4) Since the hues used in the ink are all pigment-based, the printing layer has excellent light resistance and heat resistance, and it is easy to make ink and adjust the color. 5) Which hidden pattern set is used? It is also possible in other colors.

6) By overcoating with white ink, it is possible to print a picture or text on it regardless of the hidden pattern, and if you use 1m of overcoat, the registration of the hidden pattern during printing will always be 1 level. We don't have to meet.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Ink B1 was prepared by adding 13% black ink containing carbon as a Japanese additive to Yellow Wa 6 ink for offset, and red, yellow, and indigo for offset were prepared without using carbon as a pigment. Ink A, which has the same color tone as the above ink, was prepared using only each ink, and the colors were spread using an RI tester so that the color tone was the same. The roll is divided into two parts, and the color density is 0.30c for B with black ink.
c, 0.341 c for ink A1 prepared by hand
It is c. Figure 8 shows the spectral reflection curve of the sample displayed on art paper. The difference in reflectance at a wavelength of 800 nm is 75% or more. Furthermore, when I looked at this exhibit using pure infrared light, I could not see any color difference visually, but B1 with black ink had a high density, while A looked almost as white as the undeveloped paper part, and they were large. It was possible to identify it by the difference in concentration.

Example 2 Offset ink B2, which uses navy blue as a pigment, and offset ink A2, which uses indigo, yellow, and red to match the color tone, were spread on art paper using a T (I tester), and the spectral reflectance was measured. When I added 1, it was as shown in Figure 9.The color matching in the visible range was not sufficient, but the wavelength was 8 (
The difference in reflectance at 10 nm is 80%. Also, when viewed with infrared pure, the concentration difference between both samples was that of Example 1.
The difference was larger than that in the case of .

Example 3 Yellow, red, and indigo inks for offset were mixed in equal amounts to create black ink A, and the color was spread on coated paper, and black ink B, which uses carbon as a pigment, was coated. The spectral reflectance of a sample spread on paper with an RT tester'□ was measured in the same manner as in Example 1. , :#;! ':*e@1
01m1゜oh, eh. ='= 800 nm &Cokf
The difference in reflectance was 90%.

Example 4 Offset black ink in which 20% by weight of carbon as a pigment was added to the offset ink was mixed at a content of 24% by weight, 4.8% by weight, and 9.1% by weight. Adjust the meat and test it on coated paper with an RI tester at 030c.
A sample was prepared by developing the color at a concentration of c. When these spectral reflectance curves were measured, the results were as shown in FIG. Further, the reflectance at a wavelength of 81'lOnm is as shown in Table 1.

Table 1 Example 5 Overcoat material was sealed, and 1 portion of Iriodin Ti100 was added.
Contains 7% by weight. Q, Ql with modified acrylic resin solution
Create an opaque overcoat layer on &j9 polyvarnish and chill film. The film was mixed with a developed color sample of ink B4 using navy blue as a pigment and without using navy blue.
Color samples of ink A4 prepared by adding e[ to yellow, red, and indigo, and each sample B5. covered with HIJ overcoat film. When the spectral reflectance curve of A was measured, the result was shown in FIG. When samples covered with these overcoat films were photographed with a camera using a solid-state image sensor and viewed on a CRT, the moss had large density differences and was clearly distinguishable. A 40W tungsten lamp is sufficient as a light source.

Example 6 Mix equal amounts of yellow, red, and indigo offset inks to prepare black ink, and use the ink as a sample of ink B6 using the dark blue used in Example 5 and 80 samples of ink not using it. Spread the color on top of the color sample, and apply each sample B7.
+ The spectral reflectance of AT was measured.

The results are shown in FIG. In the visible range of 400 nm to 700 nm, the reflectance decreases greatly, but at 700 nm
It can be seen that in the region of m or more, the decrease is slight. The difference in reflectance between A1 and B at a wavelength of 800 nm was 64%, which was almost the same as when the black ink was undeveloped.

Example 7 UvllllJ! using titanium oxide as a pigment! A white film is prepared by applying 0.2 cc of the chemical type ink onto a 0.1.0-mm thick polyester film using an RI tester. This was placed over a color sample prepared with blue ink Ba, which mainly used navy blue as a pigment, and blue ink A, which did not use navy blue but had a tone matching it, and the spectral reflections of each ink B, l A, When the ratio was measured, the result was 0 as shown in Figure 14.When this sample was photographed with a camera using a solid-state image sensor under the irradiation of light from a 40W tungsten light bulb, a large difference in shading appeared on the CRT.

Example 8 A white sheet with a hidden pattern and letters for cards was prepared under the following conditions. An offset phase number ink using navy blue as an ink that does not reflect or transmit near-infrared light is used, and a combination ink is adjusted using yellow, red, and indigo inks for offset according to the color tone.

First, use an offset printing machine to make a flat print on art paper using combination ink, then print the hidden pattern and letters using the above-mentioned navy indigo ink, and then print on the entire surface using white ink using titanium oxide. conduct.

After printing three times, the hidden pattern was completely hidden.

An appropriate pattern was printed on this white paper sheet using normal process ink (yellow) and black ink adjusted with three process ink colors other than black ink, to create a card-like item. This is 40. When photographed using a W tungsten lamp as a light source and a solid-state image sensor, the black ink areas adjusted in three colors showed a slight increase in density in both areas, but the difference in density was clear. It appeared on the CRT and I was able to recognize the hidden pattern. I was also able to clearly recognize letters and fingerprints that were 7th grade in size. Furthermore, I was able to sufficiently recognize the hidden patterns of the ren IfIjc and key.

[Brief explanation of the drawing]

Figures 1 to 4 show specific examples of printed matter for fish holds according to the present invention, and sectional views thereof, and Figures 5 to 7 show specific examples of printed matter for verification on which an overcoat layer is formed. The cross-sectional views and FIGS. 8 to 14 are curve diagrams showing the light reflectance of Examples 1 to 8. 1.1'... Reflective layer 2... Base material 3... Overcoat* 4... Print layer 5... Colored layer A, A, %A,... Transmits or reflects near infrared rays Ink layers B, B, ~B9...Ink layers that do not transmit or reflect near-infrared rays Applicant Kyodo Printing Co., Ltd. Agent 2. Yutaka 1) Yoshio 1st Director Norihiro Watanabe'
11 Figure 1! ' Fig. 2 Fig. 5 1!1PJ6 Fig. 7 Fig. 8 Fig. Wavelength (TtWL) Fig. 9 Fig. 10 Reverse length (Recite) Fig. 11 Wavelength (TITIL) Fig. 13 Wavelength (us)

Claims (1)

[Scope of Claims] l) At least two or more ink layers of the same color with different near-infrared transmittances or reflectances are arranged or laminated on a base material having near-infrared reflecting ability. A collation printed material featuring: 2) At least two or more types of ink layers of the same color tone with different near-infrared transmittances or reflectances are arranged or laminated on a base material that has near-infrared reflecting ability, and then an overcoat that transmits near-infrared rays. 1. A printed matter for verification, characterized in that it is covered with a layer to hide it, and further has a printed layer that transmits near infrared rays formed on the surface of the overcoat layer.