JP3353409B2 - Copy forgery prevention pattern and matching method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copy forgery prevention pattern comprising a plurality of patterns having absorptions in different wavelength regions, and particularly to a pattern which can be visually recognized, a pattern which can be recognized by infrared rays, or a pattern which can be recognized both. The present invention relates to a copy forgery prevention pattern composed of a plurality of combinations, and to a collation method of a copy forgery prevention pattern.

[0002]

2. Description of the Related Art Conventionally, machine-readable code marks such as bar codes and OCR characters have been used as means for reading information described in securities such as stock certificates, bonds, checks, gift certificates, lottery tickets, commuter passes and the like. In many cases, a code mark is formed on a base material surface that normally reflects light in the near infrared region using black ink containing carbon black or the like that absorbs light in the near infrared region.

For example, Japanese Patent Application Laid-Open No. 58-45999 discloses the use of infrared reflectivity and infrared absorbency of white ink and black ink to form mechanically readable information on a pattern mark such as a bar code. It describes that the recorded information is read by applying it to a medium or the like, irradiating it with infrared light, scanning a mark, and binarizing the intensity of the reflected infrared light. It describes that a visible light is shielded so that information is not read illegally, and a concealing layer that transmits infrared rays is formed to prevent the information from being easily read by visible light.

In recent years, color copiers have made remarkable progress, and if these are used, the above-mentioned securities can be copied almost in the same manner as genuine products. For this reason, studies have been made to make copying completely impossible. However, since it is difficult to completely prevent copying, it is necessary to register a copy forgery prevention pattern in the copying machine main body, and when the printed matter provided with this pattern is copied in the copying machine, the copying machine itself is used. Warning means have been proposed to prevent copying before the copying prevention pattern is automatically recognized, such as stopping the copying function or preventing accurate copying. However, since the pattern can be visually observed, the pattern itself is tampered with. There is a problem that copying is possible by concealing the pattern, copying and connecting half of the pattern, and the like.

[0005] Therefore, as a means for making it invisible, other than a method using a concealing layer for blocking light of a specific wavelength as described above, in addition to itself, the absorption in the visible light region is small, and the wavelength region other than that is used. In particular, the heat-absorbing glass or infrared-absorbing glass is crushed as an infrared-absorbing material, and the resulting pigment is contained in the ink to form a code mark as described above, and has low absorption in the visible light region. Therefore, it has been considered as an effective means for forgery, falsification, falsification, etc. because it becomes difficult to see.

However, in recent years, it is extremely easy to obtain infrared image reading means such as an infrared camera, and the above-mentioned code mark made of an infrared absorbing material can be easily read. Therefore, these cannot be said to be sufficient as effective prevention means against forgery, alteration, falsification, and the like.

The present invention combines a plurality of patterns having absorption in different wavelength regions and incorporates a dummy pattern to prevent unnecessary exposure and to provide a copy forgery prevention pattern which is difficult to falsify, alter and forge. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 divides an image pattern composed of characters, marks, designs, and the like, and converts one of them into an infrared ray. The ink has absorption in the region and no or little absorption in the visible region, and the other is composed of ink having absorption in the infrared region and the visible region,
And an ink that has the same absorption in the visible region but has the same absorption in the visible region but does not absorb in the infrared region, and an ink that has the same absorption in the infrared region and the visible region superimposed on the image pattern and / or the image pattern. And a dummy pattern made of at least one of inks having low absorption in the visible region.

[0009]

According to a second aspect of the present invention, an image pattern composed of characters, marks, designs, or the like is made of ink having absorption in the infrared region and no or little absorption in the visible region, and the vicinity of the image pattern and / or Alternatively, the anti-copying pattern is a combination of a black pattern which is superimposed on an image pattern and has an absorption in an infrared region and a visible region and an ink which has an absorption in a visible region and has no absorption in an infrared region.

[0011] The invention according to claim 3 is an ink which has absorption in the infrared region and no absorption in the visible region.

Embedded image (Wherein, n is 1 or 2, R is hydrogen or carbon number 1 to 1)
An alkyl group having 2 or an alkyl group having 2 to 5 carbon atoms, X is ClO ₄ —, BF ₄ —, CCl ₃ COO—, CF ₃ COO
—, SbF ₆ ⁻ , C ₆ H ₅ SO ₃ ⁻ , C ₂ H ₅ SO ₃ ⁻ , PO ₄ — ³
Is a copy forgery prevention pattern.

[0012] According to a fourth aspect of the present invention, there is provided an ink according to the present invention, wherein the ink having absorption in the infrared region and no absorption in the visible region contains Fe ²⁺ and / or Cu ²⁺ and contains phosphorus pentoxide as a main component. This is a copy forgery prevention pattern including a salt-based white crystal powder or a glass powder.

The invention according to claim 5 is obtained by subtracting the visible absorption image pattern from the infrared absorption image pattern obtained through the infrared transmission filter from the copy forgery prevention pattern formed on the base material. This is a copy forgery prevention pattern matching method for comparing and matching an image pattern with a predetermined image pattern.

The invention according to claim 6 is obtained by subtracting a visible absorption image pattern from an infrared absorption image pattern obtained through an infrared transmission filter from a copy forgery prevention pattern formed on a base material. This is a copy forgery prevention pattern matching method for comparing and matching an image pattern with a predetermined image pattern.

More specifically, the present invention relates to FIG.
As shown in FIG. 5, an image pattern A composed of characters, marks, designs, and the like serving as a reference for indicating authenticity is divided, and one of the inks has absorption in an infrared region and has no or little absorption in a visible region. And the other is configured as a divided pattern C made of ink having absorption in the infrared region and the visible region. Further, the vicinity of the image pattern A and / or the image pattern A
A copy-forgery prevention pattern comprising a divided pattern C made of ink having absorption in the infrared and visible regions superimposed on a dummy pattern D made of ink having the same absorption in the visible region but having no absorption in the infrared region. It is one. The dummy pattern D may be an ink that absorbs in the infrared region and has little absorption in the visible region.

In the copy forgery prevention pattern 1, a dummy pattern D is further provided as a camouflage on the original image pattern A. Thus, the copy forgery prevention pattern 1 looks like E in the visible region. Also, it looks like F according to an infrared reading device such as an infrared camera.

Therefore, even if the original is copied as it is,
The pattern A, which is the reference of the copy forgery prevention pattern 1, is not reproduced only by copying E. Ordinary CCD
Even if the infrared cut filter attached to the camera or the like is removed and read, only the F appears and the pattern A, which is the collation reference of the copy forgery prevention pattern 1, is not reproduced.

In order to reproduce the pattern A, which is a reference for collation of the copy forgery prevention pattern 1, F is first read by a reading device with the infrared cut filter removed. F
Are a divided pattern B having absorption in the infrared region and no absorption in the visible region, a divided pattern C having absorption in the infrared region and the visible region, and a dummy having absorption in the same visible region as the divided pattern C. Since the patterns D are arranged so as to be close to each other or partially overlap, according to the infrared camera (with an infrared cut filter), a pattern combining B, C, and D having absorption in each region is reproduced. . Then, the divided pattern B constituting the pattern A which is the collation reference
Since the divided pattern C has absorption in the infrared region, the pattern A is reproduced by irradiating the infrared light obtained through the infrared transmission filter and detecting the reflected light.

This pattern A can be reproduced by irradiating a specific wavelength, that is, infrared rays, without mere copying of the pattern A in normal copying.・ Impossibility can be decided. Since the pattern A has absorption in the visible region of the divided pattern C, the divided pattern C is not visible under visible light.
Since only the pattern A can be seen and the entire pattern A cannot be known and the dummy pattern D overlaps, a higher camouflage effect can be obtained.

Next, the present invention will be described with reference to FIG. Characters or marks that serve as verification criteria to indicate authenticity,
The pattern S made of a design or the like is made of ink having absorption in the infrared region and no or little absorption in the visible region. Further, a dummy pattern T made of black ink which is superimposed on the pattern S and / or is superposed on the pattern S and has absorption in the infrared region and the visible region, and has an absorption in the infrared region and the visible region, and a red pattern having an absorption in the visible region. This is a copy prevention pattern 2 formed by combining a dummy pattern U made of ink having no absorption in the outer region.

The copy forgery prevention pattern 2 is provided with a dummy pattern T and a dummy pattern U as a camouflage in addition to the original pattern S. Thereby, the copy forgery prevention pattern 2 looks like V in the visible region. In addition, according to an infrared reading device (using an infrared transmission filter) such as an infrared camera, it looks like W.

That is, since the dummy pattern T is also recognized at the same time, only the pattern S cannot be recognized.

Therefore, to extract only the pattern S,
For the visual pattern V, an image X in which R = G = B in the read output by the RGB color separation sensors.
Is extracted, and the arithmetic processing is performed so that the image X is subtracted from the image W. By comparing this with the pattern S stored in the copying machine in advance, the pattern S can be recognized.

This pattern S can be used, for example, as a copy protection mark. The printed matter on which the mark is written is simply recorded on the copying machine, and reading and collating the mark serves as a countermeasure against illegal copying such as stopping copying or restricting accurate copying.

As described above, under normal visible light, the pattern S is camouflaged by the dummy pattern T and the dummy pattern U, so that the pattern S is difficult to see, and even if an attempt is made to read by irradiating infrared rays, the dummy pattern T appears. It is difficult to accurately reproduce the pattern S.

The ink used in the anti-counterfeiting pattern of the present invention, which has an absorption in the infrared region and no absorption in the visible region, comprises an ultraviolet-curable resin component and an infrared-absorbing material having the above-mentioned physical properties. , A prepolymer, a monomer, a photopolymerization initiator, an auxiliary agent and the like.

Specifically, the prepolymer includes epoxy acrylate, epoxidized oil acrylate, urethane acrylate, unsaturated polyester, polyester acrylate, polyether acrylate, vinyl / acrylate, polyene / thiol, silicone, polybutadiene,
Polystyrylethyl methacrylate and the like can be mentioned.

As the monomer, a monofunctional monomer, 2
There are functional monomers and polyfunctional monomers, and also have a role as a solvent.

Examples of the monofunctional monomer include t-butylaminoethyl methacrylate, 2-cyanoethyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyloxyethyl acrylate, dicyclopentenyloxyethyl methacrylate, and 2 (2 -Ethoxyethoxy) ethyl acrylate, 2-ethoxyethyl acrylate, 2-ethylhexyl acrylate, n-hexyl acrylate, 2-hydroxyethyl acrylate,
2-2-hydroxyethyl methacrylate, hydroxypropyl acrylate, isobornyl acrylate, isobornyl methacrylate, isodecyl acrylate,
Isodecyl methacrylate, isooctyl acrylate, n-lauryl acrylate, 2-methoxyethyl acrylate, 2-phenoxyethyl acrylate, stearyl methacrylate, tridecyl methacrylate, N
-Vinylpyrrolidone, tetrahydrofurfuryl acrylate, glycidyl methacrylate and the like.

As the bifunctional monomer, neopentyl glycol acrylate, polyethylene glycol 200
Examples include diacrylate, bisphenol A ethoxyethoxy diacrylate, tripropylene glycol diacrylate, and tetraethylene glycol diacrylate.

Examples of the polyfunctional monomer include pentaerythritol triacrylate, trimethylolpropane triacrylate, propoxytrimethylol, propane triacrylate, and dipentaerythritol hexaacrylate. Further, as a photopolymerization initiator, a photoradical generator, an intramolecular bond cleavage type and an intermolecular hydrogen abstraction type are known, and as the intramolecular bond type, benzoisobutyl ether, benzyldimethyl ketal,
Diethoxyacetophenone, acyloxime ester, chlorinated acetophenone, hydroxyacetophenone, acylphosphine oxide, and the like.As the intermolecular hydrogen abstraction type, benzophenone, Michler-ketone, dibenzosuberone, 2-ethylanthraquinone, isobutylthioxane And benzyl.

In addition, a photopolymerization initiation aid having a sensitizing effect on amines such as n-butylamine, di-n-butylamine and tri-n-butylphosphine allylthiouric acid, sulfones and phosphines is added.

In addition, a non-reactive resin such as wax, vaseline, polyester, epoxy, and triazine resin and a surface modifier are added to improve printability.

Next, the present invention is applied to the copy forgery prevention pattern of the present invention.
Low absorption in visible region and absorption in infrared region
The coloring material is represented by the following general formula (I). In the formula, n is 1 or 2, and R is hydrogen or
An alkyl group having 1 to 12 carbon atoms, and an alkyl group having 2 to 5 carbon atoms.
An alkyl group is effective. X is a perchlorate (Cl
O_Four ^-), Fluoborate (BF_Four ^-), Trichlor
Acetate (CCl_ThreeCOO-), trifluoroacetate (C
F_ThreeCOO-), hexafluoroantimonate (Sb
F ₆ ^-), Benzenesulfonate (C₆H_FiveS
O_Three ^-), Ethanesulfonate (C_TwoH_FiveS
O_Three ^-), Phosphate (PO_Four ^-3).

Further, as an example of an infrared absorbing material having a low absorption in the visible region and a low absorption in the infrared region, phosphate-based white crystals and glass-based powders are made of Fe ²⁺ and / or Cu.
²⁺ at least 20% by weight, phosphorus pentoxide (P ₂ O ₅ )
Preferably, the above-mentioned phosphorus pentoxide (P ₂ O ₅ ) is 40 to 70% by weight, Fe ²⁺ and / or
Alternatively, a crystal powder containing 30 to 70% of Cu ²⁺ is desirable.

Then, this phosphate-based white crystal powder is melted with respect to the phosphate-based composition having the above composition,
It may be cooled as amorphous or crystallized by heat treatment and powdered.

The phosphate-based white crystal powder may contain the following compounds as required. Al ₂ O ₃ 0 to 10.0 wt% B ₂ O ₃ 0~30.0 wt% MgO 0 to 10.0 wt% ZnO 0 to 3.0 wt% K ₂ O 0~15.0 wt% BaO 0 -10.0% by weight SrO 0-1.0% by weight Ni, CO, Se trace

[0038]

The anti-counterfeiting pattern of the present invention is divided into an image pattern and one of which is absorbed by the ink in the infrared region and has little or no absorption in the visible region, and the other is divided into the infrared region and the visible region by ink. An ink that has absorption in the infrared and visible regions, has the same absorption in the visible region but has no absorption in the infrared region, and an ink that has absorption in the infrared region and has an absorption in the infrared region. By forming a dummy pattern composed of at least one of the inks having low absorption, the dummy pattern appears together with the divided image pattern in the visible region, and the image pattern appears in the infrared region.

The image pattern is made of ink having absorption in the infrared region and having little or no absorption in the visible region, and a black pattern having absorption in the infrared region and the visible region and a red pattern having absorption in the visible region. By forming a dummy pattern composed of ink having no absorption in the outer region, only the dummy pattern appears in the visible region, and a part of the image pattern and the dummy pattern appears in the infrared region. Further, in order to reproduce the image pattern, the visual output pattern V is read out by the respective RGB sensors for color separation.
An image X where G = B is extracted, and an arithmetic processing is performed so that the image X is subtracted from the image W.

By comparing this with an image pattern stored in a copying machine in advance, an image pattern provided on a printed material or the like can be recognized.

[0041]

Embodiments of the present invention will be described below in detail.

Example 1 (1) Infrared transmission process ink (Toyo Ink Manufacturing ID)
OL Cyan, magenta, yellow, black ink) (2) Infrared absorbing process ink (Mark V indigo, 97C black manufactured by Toyo Ink) (3) Infrared absorbing ink (white) (a) UV curable resin component・ Photomer 5018 (aliphatic polyester tetraacrylate, manufactured by San Nopco) 60 parts ○ Monomer ・ Kayarad TMPTA (trimethylolpropane triacrylate manufactured by Nippon Kayaku) 14 parts ○ Polymerization initiator ・ Kayacure MBP (3,3′-dimethyl-4-) Methoxybenzophenone Nippon Kayaku 1 part Nissocure TX (Tioxanthone Nippon Soda) 8 parts Sandry 1000 (4-phenoxydichloroacetophenone sand) 1 part ○ White petrolatum 4 parts N, N ', N'-tetrakis (p-di n- butyl aminophenyl) - and perchlorate 12 parts of p- phenylenediamine aminium, it was kneaded, and inked. (B) Toyo Ink Manufacture SS 16B Medium 10 parts by weight Toyo Ink Manufacture SUR 100B 2 parts by weight Solvent Toyo Ink Manufacture S-787 10 parts by weight Infrared absorbing pigment P ₂ O ₅ 50.0% FeO 49.5% ZnO Crystal powder with a composition of 5%

FIG. 1 shows the print pattern described above. First, the division pattern B is printed using the white infrared absorbing ink of (3) (a) or (b) above as an ink that has absorption in the infrared region and has no absorption in the visible region, and The division pattern C is printed using the infrared absorption process ink of the above (2) as the ink having the absorption in the infrared region and the visible region of the above (2) so as to form the pattern A. Further, a dummy pattern D was printed using the infrared transmitting process ink of the above (1) as an ink having no absorption in the infrared region.

The pattern E was confirmed by visual inspection of the printed surface, but the pattern A, which was a copy forgery prevention mark, could not be visually recognized.

Further, the pattern F could be confirmed by reading using a CCD camera or a linear sensor with the infrared cut filter removed, but the pattern A, which is a copy prevention mark, could not be confirmed at this time.

Further, the infrared cut filter was removed from the spectroscope of the linear sensor (TCD1500C manufactured by Toshiba) having the spectral sensitivity as shown in FIG. 3, and the infrared transmission filter (IR8 manufactured by HOYA) having the spectral characteristics shown in FIG.
3) was mounted, the sample was irradiated with a xenon lamp, and the reflected light was detected. As a result, pattern A was confirmed.

Example 2 A pattern S was printed using the (3) infrared-absorbing ink of Example 1, and an infrared-absorbing process ink was used as an ink having absorption in the infrared region and the visible region thereon. The dummy pattern T was printed using Toyo Ink Manufacturing Mark V 97C black), and the dummy pattern U was printed using the infrared transmission process ink of (1) above as an ink having no absorption in the infrared region. When the printed surface was visually observed, the pattern V was confirmed, but the pattern S, which is a copy prevention mark, could not be visually recognized.

Further, even when a CCD camera or a linear sensor without an infrared cut filter was used, the pattern S as a copy prevention mark could not be confirmed. Further, a linear sensor having a spectral sensitivity as shown in FIG.
The infrared cut filter was removed from the spectrometer (1500C), an infrared transmission filter (IR83 made by HOYA) having the spectral characteristics shown in FIG. 4 was attached, and a xenon lamp was irradiated to detect the reflected light. Although confirmed, the pattern S, which is a copy protection mark, cannot be recognized due to the influence of the dummy pattern T. Therefore, for the pattern V, an image X in which R = G = B in the read output by the RGB color separation sensors.
Is extracted and the image X is subtracted from the image W, and the pattern S is taken out. The pattern S can be extracted. The pattern S can be recognized by comparing it with the pattern S stored in the copying machine in advance. We were able to.

[0049]

As described above, the anti-counterfeiting pattern of the present invention is formed by superimposing anti-copying marks and dummy patterns with inks having different wavelength absorption characteristics to thereby prevent anti-counterfeiting. Since the mark is difficult to visually recognize, the exact shape and the like of the mark become unclear, making it difficult to forge, falsify, or falsify, which is a deterrent to fraud. Also, the copy forgery prevention pattern matching method can reproduce the copy forgery prevention mark by subtracting an unnecessary dummy pattern from the pattern including the copy forgery prevention mark and the dummy pattern, so that the system can be easily incorporated into the copying machine. It is possible to prevent fraudulent activities using a copying machine.

[Brief description of the drawings]

FIG. 1 is a plan view of a printed material formed by sequentially forming a copy forgery prevention pattern of the present invention.

FIG. 2 is a plan view of a printed material formed by sequentially forming a copy forgery prevention pattern of the present invention.

FIG. 3 is a linear sensor TCD made by Toshiba having spectral sensitivity.
It is a graph which shows the 1500 spectral characteristics.

FIG. 4 is a graph showing the spectral characteristics of the infrared transmission filters applied in Examples 1 and 2.

[Explanation of symbols]

 1, 2 Copy forgery prevention pattern A pattern B division pattern C division pattern D dummy pattern E pattern F pattern S pattern T dummy pattern U dummy pattern V pattern W pattern

Claims (6)

(57) [Claims] An image pattern composed of characters, marks, designs, etc. is divided, and one of them is made of ink having absorption in an infrared region and having little or no absorption in a visible region, and the other is made of an infrared region and a visible region. An ink having absorption in the infrared region and visible region in the vicinity of the image pattern and / or superimposed on the image pattern and having the same absorption in the visible region, And a dummy pattern comprising at least one of an ink having no absorption in an infrared region and an ink having an absorption in an infrared region and having a low absorption in a visible region. 2. Characters, marks, designs, etc.
Absorb the image pattern in the infrared region and absorb in the visible region
It is composed of no or little ink and the image
Superimposed on the vicinity of the turn and / or the image pattern
Black pattern with absorption in infrared and visible regions
And an ink that has absorption in the visible region and no absorption in the infrared region
Characterized by combining dummy patterns consisting of
Copy forgery prevention pattern. 3. Absorption in the infrared region and absorption in the visible region.
No ink of is, [Formula 1] (Wherein, n is 1 or 2, R is hydrogen or carbon number 1 to 1)
2 alkyl group or an alkyl group having a carbon number of 2 to 5, X is
ClO ₄ —, BF ₄ —, CCl ₃ COO—, CF ₃ COO
—, SbF ₆ ⁻ , C ₆ H ₅ SO ₃ ⁻ , C ₂ H ₅ SO ₃ ⁻ , PO ₄ — ³
3. The method according to claim 1, further comprising:
A copy forgery prevention pattern described in REKA. 4. An absorption in the infrared region and absorption in a visible region.
Ink without ink is Fe ²⁺ And / or Cu ²⁺ Containing
Phosphate-based white crystalline powder containing phosphorus pentoxide as a main component or
Or glass powder.
The forgery prevention pattern according to any one of the above. 5. A copy forgery prevention pattern formed on a base material.
The infrared absorption image obtained through the infrared transmission filter.
By subtracting the visible absorption image pattern from the turn
The obtained image pattern is compared with a predetermined image pattern.
Forgery prevention pattern matching method characterized by matching
Law. 6. A copy protection pattern formed on a base material.
3 color same density image pattern by color separation sensor
Infrared absorption detected and obtained through an infrared transmission filter
Subtract the three color same density image pattern from the image pattern
Image pattern obtained by
Forgery prevention pattern, characterized by comparing and matching
Matching method.