JPH0768983A - Medium for information carrying sheet and machine-readable information carrying sheet using the same - Google Patents

Abstract

PURPOSE:To obtain an information carrying sheet in which an information pattern is scarcely visually observed with bare eyes and a medium applied to a method for manufacturing the same by dispersing infrared absorption substance represented by the special structural formula in a film coated in a sheet substance, etc. CONSTITUTION:A medium for an information carrying sheet is used for manufacturing the sheet. In this case, infrared absorption substance represented by the shown structural formula is dispersed in an entire sheet substrate or in a specific region or in a film coating its upper surface. In the formula, n is natural number of 1 or 2, R is hydrogen or alkyl group having 1-12 carbon atoms, X<-> is ClO4<->, BF4<->, CCl3COO<->, CF3COO<->, SbF6<->, C6H5SO3<->, C2H5SO3<->, or PO4<3->, or their mixture. On the other hand, colored pigment or dye is contained together with the absorption substance in the sheet substance or the coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information carrying sheet such as securities or identification cards having a machine readable information pattern by an infrared reading device, and in particular, the presence of the above information pattern can be visually recognized by the naked eye. The present invention relates to a difficult information carrying sheet and a medium for the information carrying sheet which is applied to the production of the information carrying sheet.

[0002]

2. Description of the Related Art In recent years, with the spread of color copying machines, there have been a lot of cases where counterfeit securities such as stocks, bonds, checks, passbooks and lottery tickets are forged.

On the other hand, ID cards such as passports and driver's licenses are provided with a face photo column and a signature column for identifying whether or not the owner is the owner. Recently, these columns have been provided. There are also many cases of falsification, alteration and misuse.

Therefore, conventionally, in order to prevent such forgery and alteration, a printing ink containing an infrared absorbing substance such as carbon black or leuco dye is used to infrared-irradiate any part of the above-mentioned securities, identification card, etc. A method of providing a machine-readable information pattern with a reading device has been adopted. That is, for the former counterfeit copy, the copying machine main body is provided with means for mechanically reading the information pattern, and by providing the control means for stopping the copying operation when the information pattern is read by the copying machine. In order to prevent this, and in the case of tampering with the latter, the ID card such as the created passport or driver's license is mechanically read by an infrared reading device to determine the presence or absence of the above information pattern. The truth is determined.

However, since the above infrared absorbing substances such as carbon black and leuco dyes have a light absorbing property even in the visible region, the above information pattern is mechanically read by an infrared reading device and its presence is visible to the naked eye. It was easy to read and was still insufficient as a means for effectively preventing the above forgery and alteration.

Under such a technical background, heat ray absorbing glass or infrared absorbing glass has recently been crushed as a new infrared absorbing material having a small absorption in the visible region and an absorptivity in the infrared region. A method of obtaining the pigment is being investigated.

When such an infrared absorbing material is applied to form an information pattern as described above, since the information pattern has a small absorption in the visible region, it becomes difficult to see, so that the information is forged or altered. It was said that can be effectively prevented.

[0008]

By the way, the infrared absorbing material obtained by crushing the above-mentioned heat ray absorbing glass or infrared absorbing glass certainly reduces absorption in the visible region when compared with conventional materials such as carbon black. Has been
On the other hand, it has a drawback that the absorption in the infrared region is inferior to that of carbon black and the like.

Therefore, when an infrared absorbing material made of the above infrared absorbing glass or the like is applied to obtain a printing ink and the information pattern described above is formed by this infrared absorbing printing ink, the infrared region is sufficient. In order to have absorptivity, it is necessary to set the film thickness of the pattern larger than that of the ink to which carbon black or the like is applied, and a step is generated between the sheet base material and the pattern forming site, and the above information is obtained from this step. There is a drawback that the existence of the pattern is known, and there is still a problem that it is insufficient as a means for preventing the above-mentioned forgery and alteration.

The present invention has been made by paying attention to such a problem, and its object is to apply to an information-bearing sheet in which the presence of the above-mentioned information pattern is hard to be visually recognized with the naked eye, and to manufacture the information-bearing sheet. The present invention is to provide a medium for an information carrying sheet.

[0011]

Therefore, the present inventor has continued diligent research in order to achieve the above-mentioned object, and replaces the information pattern with the conventional method in which the information pattern is composed of infrared-absorbing ink, and the infrared reflectivity is changed. While this is composed of ink, N, N, N ', N', tetrakis (P-
A compound represented by di-butylamino) P phenylenediaminium salt is applied, and in a sheet base material such as securities, identification cards, etc. on which the above information pattern is formed or in a film coated on the surface thereof. The present invention has been completed by discovering that the presence of an information pattern is hard to be visually recognized by dispersing the infrared absorbing substance.

That is, the invention according to claim 1 is premised on the medium for an information carrying sheet applied to the production of an information carrying sheet, and the inside of the entire sheet base material or a specific region, or the entire above-mentioned sheet base material. Alternatively, an infrared absorbing substance represented by the following structural formula (I) is dispersed inside the coating film coated on the specific region,

[Chemical 2] (In the formula, n is a natural number of 1 or 2, R is hydrogen or an alkyl group having 1 to 12 carbon atoms, X ⁻ is ClO ₄ ⁻ , B
F ₄ ⁻ , CCl ₃ COO ⁻ , CF ₃ COO ⁻ , SbF ₆ ⁻ , C ₆
H ₅ SO ₃ ⁻ , C ₂ H ₅ SO ₃ ⁻ , or PO ₄ ³⁻ or a mixture thereof is shown) The invention according to claim 3 is produced by applying the medium for the information carrying sheet. Based on the information carrying sheet as described above, the information carrying sheet medium is provided with an information pattern formed by an infrared reflective ink in an arbitrary portion of a region in which the infrared absorbing material is dispersed.

In the information-bearing sheet thus obtained, the medium for the information-bearing sheet is coated on the entire sheet base material or inside the specific area, or on the entire sheet base material or on the specific area. Since the above-mentioned special infrared absorbing substance is dispersed inside the coating film, the medium for the information-bearing sheet in the area where the information pattern of the region where the infrared absorbing substance is dispersed is not provided absorbs infrared rays, Since the information pattern provided in an arbitrary part of the area where the absorbing substance is dispersed is composed of infrared reflective ink, it reflects infrared light. By combining these, the above information pattern can be mechanically read by infrared light. Is possible.

Examples of the infrared reflecting ink include white type infrared reflecting ink containing titanium oxide (TiO ₂ ) as a main component. These infrared reflecting inks are infrared rays such as the above infrared absorbing glass. Since the infrared reflection coefficient is larger than the absorption coefficient, infrared rays sufficient for detecting an information pattern can be reflected even if the ink film thickness is set thin. Therefore, since the film thickness of the ink forming the above information pattern becomes thinner, a step is less likely to occur between the sheet base material and the information pattern, and a white type infrared reflecting ink containing titanium oxide as a main component is used. When applied, the sheet base material and the information pattern can be colored in the same color, which makes it difficult to visually inspect the information pattern with the naked eye.

Here, as the sheet base material constituting the main part of the medium for the information carrying sheet, any sheet material can be used according to the applied information carrying sheet, for example, plain paper, synthetic paper, plastic sheet. Etc. Further, as a means for dispersing the infrared absorbing substance in the entire sheet base material or inside a specific region, a method such as kneading, kneading, and kneading is exemplified depending on the type of the material constituting the sheet base material. it can. For the purpose of reinforcing the sheet base material, a reinforcing sheet may be laminated on one side or both sides of the sheet base material in which the infrared absorbing substance is dispersed.

Further, instead of the method of dispersing it in the sheet substrate, a method of coating the whole or a specific region of the sheet substrate with the coating agent in which the infrared absorbing substance is dispersed may be adopted.

On the other hand, the means for forming an information pattern by the above-mentioned infrared-reflective ink on an arbitrary portion of the region where the infrared absorbing substance is dispersed in the medium for the information-bearing sheet is optional according to the information-bearing sheet to be applied. For example, when it is applied to securities such as stock certificates, bonds, and checks, printing methods such as gravure and offset, which are the usual manufacturing methods for such securities, and passports, driver's licenses, etc. When it is applied to identification cards etc., the transcription method can be exemplified. Further, a process ink having absorptivity in the visible region and having no infrared absorption is used to form an appropriate pattern according to the type of the information carrying sheet on any part of the medium for the information carrying sheet by any forming means. The presence of an appropriate pattern of this process ink makes it more difficult to visually observe the information pattern with the naked eye.

Next, the infrared absorbing substance dispersed in the entire sheet substrate or in the specific region or in the coating film coated on the sheet substrate or in the specific region is represented by the following structural formula (I). The compounds indicated apply.

[0019]

[Chemical 3] However, in the formula, n represents a natural number of 1 or 2, R represents hydrogen or an alkyl group having 1 to 12 carbon atoms, preferably 2 to 5 carbon atoms. X ⁻ is perchlorate (ClO ₄ ⁻ ), fluoroborate (BF ₄ ⁻ ), trichloroacetate (CCl ₃ CO 2).
O ⁻ ), trifluoroacetate (CF ₃ COO ⁻ ), hexafluoroantimonate (SbF ₆ ⁻ ), benzene sulfonate (C ₆ H ₅ SO ₃ ⁻ ), entasulfonate (C
₂ H ₅ SO ₃ ⁻ ) and phosphate (PO ₄ ³⁻ ) or a mixture thereof.

When the infrared absorbing substance represented by the above structural formula (I) is applied, the infrared absorbing substance is excellent in its infrared absorbing ability, and therefore the infrared absorbing substance dispersed in the sheet base material or the coated film is used. It has the advantages that the blending ratio can be reduced and that the sheet base material or the above-mentioned coating can be colored white.

Here, since the infrared absorbing substance to be applied in the above-mentioned medium for the information carrying sheet is white or lightly colored, it is suitable for use where a white or lightly colored sheet base material is used. However, when it is applied to a sheet base material that requires a color other than this, the effect is halved. The invention according to claim 2 is made from such a technical demand.

That is, the invention according to claim 2 is claim 1
On the premise of the medium for an information-bearing sheet according to, the inside of the sheet base material or the inside of the coating film contains a color pigment or a dye together with the infrared absorbing substance represented by the structural formula (I). It is a thing.

However, in the invention according to the second aspect, it is desirable that the information pattern is formed by an infrared reflective ink having the same color as the color of the color-adjusted sheet base material or the coating film coated on the surface thereof. Claim 4
The invention according to (1) is made from such technical demands.

That is, the invention according to claim 4 is based on the information-carrying sheet according to claim 3, and a coloring pigment or dye having no absorptivity in the infrared region is contained in the infrared reflective ink. It is characterized by that.

Next, various information such as passports and driver's licenses, identification cards, stock certificates, bonds, checks, passbooks, lottery tickets, tickets, coupons, commuter passes, etc. can be applied to the information carrying sheet. In addition to securities, securities-related products such as ID cards, credit cards, cash cards, plastic cards such as gift cards, and prepaid cards typified by telephone cards can be used instead of cash vouchers.

Further, the information pattern has, for example, wavelengths of 750 nm, 780 nm, 810n produced by a semiconductor laser.
m, 830 nm, 905 nm, 940 nm, or other laser light is radiated to cut the light in the visible region and an infrared camera identifies the pattern as a black negative pattern.

[0027]

According to the first aspect of the present invention, the structural formula (I) is provided inside the entire sheet substrate or the specific region, or inside the film coated on the entire sheet substrate or the specific region. Since the infrared absorbing substance represented by (1) is dispersed, the infrared rays irradiated onto the region where the infrared absorbing substance is dispersed are absorbed by the infrared absorbing substance, and the infrared reflectance from the region is reduced.

Therefore, a machine-readable information-carrying sheet can be easily manufactured by forming an information pattern with an infrared-reflecting ink on an arbitrary portion of a region in which the infrared-absorbing substance is dispersed in the information-carrying sheet medium. It becomes possible.

According to the second aspect of the invention, since the sheet base material or the coating film contains a color pigment or dye together with the infrared absorbing substance represented by the structural formula (I). The sheet base material or the coating film can be color-adjusted to a chromatic color system suitable for the application.

On the other hand, according to the third aspect of the invention, since the information carrier sheet medium is provided with the information pattern formed by the infrared-reflective ink in an arbitrary portion of the region where the infrared-absorbing substance is dispersed. In combination with a sheet base material or a coating film that absorbs infrared rays, the above information pattern can be mechanically read by infrared rays.

Further, since the infrared reflective ink usually has a large infrared reflection coefficient as compared with the infrared absorption coefficient of the above-mentioned infrared absorbing glass or the like, even if the ink film thickness is set thin, it is sufficient for detecting the information pattern. It can reflect infrared rays. Therefore, since the film thickness of the ink forming the information pattern becomes thinner, a step is less likely to occur between the sheet base material or the coating film and the information pattern, which makes it difficult to visually check the information pattern with the naked eye. Becomes

On the other hand, according to the invention of claim 4, since the coloring pigment or dye having no absorption in the infrared region is contained in the infrared reflecting ink, the color is adjusted to a chromatic color system. The application to the information carrying sheet medium according to item 2 makes it difficult to visually check the information pattern with the naked eye.

[0033]

EXAMPLES Examples of the present invention will be described in detail below.

Example 1 A securities paper was coated with the following composition for film formation (ultraviolet curable offset ink) to form a film in which an infrared absorbing substance was dispersed to form a medium for an information carrying sheet. Manufactured.

(Composition for forming a film) Oligomer (Aliphatic polyester tetraacrylate 60 parts by weight: San Nopco's trade name Photomer 5018) Monomer (Trimethylolpropane triacrylate 14 parts by weight: Nippon Kayaku's trade name Kayarad TMPTA) Polymerization initiator (3,3-dimethyl-4-methoxybenzophenone 1 part by weight: Nippon Kayaku Co., Ltd., trade name Kayacure MBP) Polymerization initiator (thioxanthone 8 parts by weight: Nippon Soda Co., Ltd., trade name Nissocur TX) Polymerization initiator ( 4-phenoxydichloroacetophenone: Sandry 1000) 1 part by weight white petrolatum 4 parts by weight N, N, N ', N'-tetrakis (p-di-n-butylaminophenyl) p phenylenediaminium excess Chlorate (infrared absorbing material) 12 parts by weight Medium for carrying sheet in the visual is white, and the reflectance to light of a semiconductor laser of 940nm was 19% (see the solid line A in FIG. 6).

Next, a white-based infrared reflective ink containing titanium oxide as a main component (trade name: offset ink TSP202 manufactured by Toyo Ink Mfg. Co., Ltd.) is formed on the medium for the information carrying sheet.
An information pattern having a thickness of 2 μm was formed by a mixed ink obtained by adding a small amount of process ink (trade name: FDOL ... indigo, red, yellow manufactured by Toyo Ink Mfg. Co., Ltd.) to white). The reflectance of this information pattern with respect to the light from the semiconductor laser is 80%.
(See solid line B in FIG. 6), the PCS (print contrast signal) value, which is the image contrast, was 0.76.

Further, four color process inks (trade name F manufactured by Toyo Ink Mfg. Co., Ltd.) having a property of transmitting infrared rays are formed on the medium for information carrying sheet on which the above information pattern is formed.
DOL ... indigo, crimson, yellow, mixed ink) was used to offset-print a color image to obtain a target information carrying sheet. The reflectance of the color image with respect to the light from the semiconductor laser is shown by the solid line C in FIG.

Then, in this information carrying sheet,
Since the thickness of the information pattern is as thin as 2 μm and there is almost no step due to the pattern formation, it is difficult to visually recognize the information pattern from the surface shape, and it is difficult to distinguish the medium for information carrying sheet and the information pattern from white type. In addition, since the above-mentioned information pattern is covered with the color image of the process ink, it is difficult to visually check it from the color, and only the above-mentioned color image is visible.

Next, the infrared cut filter attached to the linear sensor (trade name TCD1500C manufactured by Toshiba Corp.) having the relative sensitivity shown in FIG. 4 is removed, and in place of this, the red cut filter having the spectral characteristic shown in FIG. After attaching an external transmission filter (trade name IR83 manufactured by HOYA), the information carrying sheet was irradiated with light of 940 nm and the machine reading was attempted. As a result, a negative pattern containing only the above information pattern was confirmed on a black background. It was At this time, the color image formed by the process ink could not be seen, and this color image did not hinder the mechanical reading of the information pattern.

On the other hand, when an attempt was made to copy the above information-bearing sheet by a color copying machine, the color copying machine did not operate because the copy prevention mark registered in the color copying machine was included in a part of the information pattern. Could not be done.

Example 2 N, N, N ′, N′-Tetrakis (p-di-n-butylaminophenyl) pphenylenediaminium hexafluoroanthate powder was mixed with polyethylene terephthalate pellets (Japan Unipet). The medium 2 for information-carrying sheets was manufactured by kneading the product under the trade name RT543) at a blending ratio of 0.5% by weight and forming a film to form a sheet base material 20 having a thickness of 188 μm.

The information carrying sheet medium 2 was visually white and had a reflectance of 20% with respect to the light of the semiconductor laser of 940 nm.

A bar code-shaped information pattern 21 having a thickness of 2 μm as shown in FIG. 1 was formed on the medium 2 for information carrying sheet by using the above-mentioned white type infrared reflecting ink containing titanium oxide as a main component. The reflectance of the information pattern 21 with respect to the semiconductor laser beam of 940 nm was 80% as in Example 1, and the PCS value as the image contrast was 0.75.

Next, color images 22, 23, 24 of stock certificate pattern are formed on the medium 2 for information carrying sheet provided with the information pattern 21 by using the process ink of four colors having the property of transmitting infrared rays. Was offset-printed to produce the intended information carrying sheet (stock certificate) 25.

In this information carrying sheet 25, since the thickness of the information pattern 21 is as thin as 2 μm and there is almost no step due to the pattern formation, it is difficult to visually check the information pattern from the surface shape, and for the information carrying sheet. Both the medium 2 and the information pattern 21 are white and it is difficult to distinguish them, and since the color images 22, 23, and 24 formed by the process ink cover the information pattern 21, it is difficult to visually check the colors, as shown in FIG. Only the color image was visible.

On the other hand, as shown in FIG.
As shown in FIG. 3, when irradiating light of 940 nm from the light source 3 and observing the reflected light with the IR scope 4 attached with the infrared transmission filter, the information pattern 21 is formed on the black background.
A negative barcode-shaped pattern in FIG. 3 was confirmed as shown in FIG. 3 (however, in FIG. 3, it is shown by inverting black and white). At this time, the color image formed by the process ink could not be seen, and the color image did not hinder the mechanical reading of the information pattern 21 as in Example 1.

[0047]

According to the inventions according to claims 1 and 2, the above-mentioned structure is provided inside the entire sheet substrate or the specific region, or inside the film coated on the entire sheet substrate or the specific region. Since the infrared absorbing substance represented by the formula (I) is dispersed, a machine-readable information carrying sheet is formed by forming an information pattern with an infrared reflecting ink at an arbitrary site in the region where the infrared absorbing substance is dispersed. It has the effect of being easily manufactured.

According to the invention of claims 3 to 4,
Since the presence of the machine-readable information pattern is less visible to the naked eye, it has the effect of providing an information-bearing sheet that is not easily forged or altered.

[Brief description of drawings]

FIG. 1 shows an information carrying sheet according to a second embodiment of FIG.
Sectional drawing of II-II surface.

FIG. 2 is a plan view of the information carrying sheet according to the second embodiment on which a stock certificate pattern color image is formed.

FIG. 3 is a plan view of an information carrying sheet according to a second embodiment in which an information pattern is read by an IR scope.

FIG. 4 is a graph showing relative sensitivity of a linear sensor applied in Example 1 to wavelength.

5 is a graph showing the spectral characteristics of the infrared transmission filter applied in Example 1. FIG.

FIG. 6 is a graph showing the information carrier sheet medium manufactured in Example 1, the information carrier sheet medium, the information pattern, and the reflectance of the color image with respect to each wavelength.

[Explanation of symbols]

 2 medium for information carrying sheet 20 sheet base material 21 information pattern 22 color image 23 color image 24 color image 25 information carrying sheet

Claims (4)

[Claims] 1. A medium for an information-bearing sheet applied to the production of an information-bearing sheet, comprising the entire sheet base material or a specific region, or
An information carrier sheet medium, wherein an infrared absorbing substance represented by the following structural formula (I) is dispersed inside the entire sheet base material or inside a coating film coated on a specific region. [Chemical 1] (In the formula, n is a natural number of 1 or 2, R is hydrogen or an alkyl group having 1 to 12 carbon atoms, X ⁻ is ClO ₄ ⁻ , B
F ₄ ⁻ , CCl ₃ COO ⁻ , CF ₃ COO ⁻ , SbF ₆ ⁻ , C ₆
H ₅ SO ₃ ⁻ , C ₂ H ₅ SO ₃ ⁻ , PO ₄ ³⁻ , or a mixture thereof) 2. The information according to claim 1, wherein the sheet base material or the coating film contains a color pigment or dye together with the infrared absorbing substance represented by the structural formula (I). Carrier sheet media. 3. A machine reading comprising an information pattern formed by an infrared-reflective ink in an arbitrary portion of a region in which the infrared-absorbing substance is dispersed in the medium for an information-bearing sheet according to claim 1 or 2. Possible information carrying sheet. 4. The machine-readable information-carrying sheet according to claim 3, wherein the infrared-reflective ink contains a coloring pigment or dye which does not absorb in the infrared region.