JP3409351B2 - Information carrying sheet - Google Patents

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 and identification cards having a machine-readable information pattern by an infrared reading device, and in particular, the presence of the information pattern can be visually recognized by the naked eye. The present invention relates to a difficult information carrying sheet.

[0002]

[Prior art]

In recent years, with the spread of color copiers, there have been many cases where counterfeit securities such as stock certificates, bonds, checks, passbooks and lottery tickets are forged.

On the other hand, identification documents 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 portion of the securities, identification card or the like. A method of providing a machine-readable information pattern with a reading device has been adopted.

[0006]

By the way, since the carbon black, leuco dye and the like have a light absorbing property not only in the infrared region but also in the visible light region, the marks such as the bar code pattern can be machined by an infrared reading device. The pattern was readable and visible.

Therefore, in order to make the existence of the information pattern conscious, there is a possibility that this portion is forged or altered.

The present invention has been made by paying attention to such a problem, and an object thereof is a machine having a machine-readable mark such as a bar code pattern and the mark is hard to be visually recognized. It is to provide a readable information carrying sheet.

[0009]

Means for Solving the Problems That is, the invention according to claim 1, the surface having an infrared reflective, constituted by the surface color similar der Ru infrared absorbing printing ink layer
With a machine-readable mark, said infrared-absorbing
The printing ink layer has a ^composition containing Fe ²⁺ and / or Cu ^2+.
Phosphate-based white crystalline powder whose main component is phosphorus pentoxide
An information-bearing sheet containing: Well
The invention according to claim 2 is a surface having infrared reflectivity.
And an infrared-absorbing printing ink that is similar in color to the surface
A machine-readable mark composed of layers,
The infrared-absorptive printing ink layer is Fe ²⁺ and / or C
The above glass containing a glass-based powder material containing u ²⁺ ,
The powder-based material is a solvent for the infrared absorbing printing ink.
The information carrying sheet is characterized in that the composition to be removed contains 80% by weight or less .

In the invention according to claim 1 or 2 , the surface having infrared reflectivity and the surface are partially formed.
Since it has a similar color to the infrared-absorbing printing ink layer that is concealed in, it is difficult to see machine-readable marks (hereinafter simply referred to as marks), but the infrared reflectance (absorption) is different. Machine reading with infrared light is possible.

Incidentally, the information carrying sheet usually has a white or pale appearance. On the other hand, the infrared reflectance (rate) desired in machine reading is 60% or more. In order to obtain a surface satisfying such requirements, the material of the information carrying sheet may be mixed with an infrared reflecting substance such as titanium oxide, or the surface of the information carrying sheet may be coated with an ink containing the infrared reflecting substance. Further, the surface can be adjusted to an arbitrary color by using an infrared reflecting substance and a colorant having no infrared absorption in combination.

Next, the infrared-absorbing printing ink layer provided on the surface must have at least the same color as the surface. As described above, since the surface is assumed to be white or light-colored, phosphorus pentaoxide (P ₂ O) containing 20% by weight or more of Fe ²⁺ and / or Cu ²⁺ which is a white or light-colored infrared absorbing substance. ₅ ) Crystal powder mainly composed of
Alternatively, a glass-based powder containing Fe ²⁺ and / or Cu ²⁺ is used.

A crystal powder containing 20 wt% or more of Fe ²⁺ and / or Cu ²⁺ and containing phosphorus pentoxide (P ₂ O ₅ ) as a main component (hereinafter referred to as a phosphate-based white crystal powder) is Fe ²⁺
And / or a crystalline powder containing 20% by weight or more of Cu ^{2+ and} having phosphorus pentoxide (P ₂ O ₅ ) as a main component, preferably 40 to 70% by weight of phosphorus pentoxide, Fe ²⁺ and / or
Alternatively, a crystal powder containing 30 to 70% of Cu ²⁺ is desirable. The phosphate-based white crystal powder is obtained by melting and crystallizing the phosphate-based composition having the above-mentioned composition to obtain a phosphate-based white crystal and powdering the same. is there.

Further, the glass powder containing Fe ²⁺ and / or Cu ²⁺ (hereinafter referred to as glass powder material) means phosphorus pentoxide (P ₂ O ₅ ) as a main component, and iron oxide and / or Or a powder material containing 1.0% by weight or more of copper oxide, more preferably 35.0 to 80.0% by weight of phosphorus pentoxide,
It is a glass-based powder material containing 0 to 3.0% each of iron oxide and copper oxide.

If necessary, the following compounds may be contained in the phosphate white crystal powder and the glass powder material.

Al ₂ O ₃ 2.0 to 10.0% by weight B ₂ O ₃ 1.0 to 30.0% by weight MgO 3.0 to 10.0% by weight ZnO 0 to 3.0% by weight K ₂ O 0 to 15.0 wt% BaO 0 to 10.0 wt% SrO 0 to 1.0 wt% Ni, Co, Se Trace amount

The infrared absorbing printing ink can be obtained by dispersing the phosphate white crystal powder or the glass powder material in a binder resin.

It is desirable that the phosphate-based white crystal powder or glass-based powder material described above is contained in the infrared absorbing printing ink composition excluding the solvent in an amount of 80% by weight or less. If it exceeds 80% by weight, the mark formed becomes matte and the powder surface is reflected, that is, infrared light is reflected and the cohesive force is also limited, and the adhesiveness and scratch strength are reduced. is there.

As the binder contained in the infrared absorptive printing ink, vinyl acetate vinyl resin, saturated polyester, polyurethane elastomer and the like can be applied, and 20% by weight or less is contained in the infrared absorptive printing ink composition excluding the solvent. Preferably. Further, in addition to the above materials, a defoaming agent, a lubricant and the like may be contained.

Next, as the solvent applied to the infrared absorbing printing ink, toluene, methyl isobutyl ketone, xylene, cyclohexanol, isobutyl acetate,
Examples thereof include cyclohexanone, methylcyclohexanone, glycol derivatives such as ethylene glycol monobutyl ether, and mixed solvents thereof. Of course, a solventless type may also be used.

Further, since the white crystalline powder material and the glass powder material exhibit white or light coloring by themselves, they may be slightly visible when applied to a chromatic color substrate. In such a case, it is possible to make visual observation difficult by mixing a coloring pigment or a dye and adjusting the same color system as that of the chromatic color substrate.

The infrared absorbing ink is partially printed on the surface having infrared reflectivity by a known printing method with an infrared absorbing printing ink having a similar color to the surface, and the surface having infrared reflectivity and infrared absorbing properties are absorbed. Forming a mark composed of a printing ink layer having a positive polarity. The infrared absorbing property of the infrared absorbing printing ink layer varies depending on the film thickness of the infrared absorbing printing ink layer.
% Or less) is preferable. The mark is not particularly limited, but a bar code having high reading accuracy is preferable.

In the information-bearing sheet according to the first or second aspect, it is difficult to visually recognize the mark as described above. However, a pattern such as a character is appropriately overprinted on the mark by the process ink that transmits infrared rays. In some cases, a pattern such as characters can be formed on the mark. In other words, the surface and the infrared-absorbing printing ink layer are of the same color, but the infrared-absorbing printing ink layer has a thickness, which may cause minute irregularities and make the presence of the mark conscious. There is. Therefore, in order to make the presence of the mark less visible, it is effective to provide a printing layer that does not absorb infrared rays. The invention according to claim 3 is created from such a technical point of view.

That is, the invention according to claim 3 is premised on the information carrying sheet having the machine-readable mark according to claim 1 or 2 , and a printing layer having no infrared absorption is provided on the machine-readable mark. It is an information carrying sheet characterized by being provided.

The infrared-absorptive printing layer is a layer in which a pattern such as characters is appropriately solidly or partially overprinted on the mark by a process ink having an absorptivity in the visible region and having no infrared absorption. The process ink used here is a conventional process ink exhibiting colors such as cyan, yellow, magenta, and black.

The mark such as a bar code provided on the surface of the information carrying sheet according to any one of claims 1 to 3 has a wavelength of 750 nm by a semiconductor laser,
A black pattern is identified by laser light of 780 nm, 810 nm, 830 nm, 905 nm, or the like.

[0027]

According to the first or second aspect of the present invention, a mark such as a bar code is formed by a base material having infrared reflectivity and an infrared absorbing ink layer of a similar color to the surface that partially hides the surface. Since the marks are formed, it is difficult to visually recognize the marks. However, since the infrared rays have different reflectivity (absorption), mechanical reading by infrared rays is possible.

On the other hand, according to the third aspect of the invention, since the pattern is appropriately overprinted on the mark by the process ink which has the absorptivity in the visible region and does not absorb the infrared rays, the presence of the information pattern is further improved. It can be even more confusing.

[0029]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[Embodiment 1] An information carrying sheet 1 according to this embodiment has a surface 2 formed of coated paper as shown in FIGS. 1 and 2, and an infrared absorbing property formed on the surface 2 and described below. Of the bar code pattern formed by the printing ink layer 3 (shown by a broken line in FIG. 1) and overprinted on the bar code pattern by the following process ink (indigo, red, yellow). The printing layer 4, 5, 6 constitutes the main part.

In the following, the cupric-containing phosphate-based composition having the following composition is first melted and crystallized to obtain a cupric-containing phosphate-based white crystalline compound. .

[Cuprate-containing phosphate composition] P ₂ O ₅ 50.0% by weight CuO 49.5% by weight ZnO 0.5% by weight

Regarding this compound, a copper tube (CuK
When X-ray diffraction was performed using α), the diffraction angle (2θ)
= 28.14, 30.07, 30.34, and 44.01 have strong peaks, and it is confirmed that they are crystallized.

Next, the cupric-containing phosphate-based white crystals were pulverized into powder, and this was used as an infrared absorbing pigment to prepare an infrared absorbing printing ink having the following composition.

[0035] [Infrared absorbing printing ink]   Pigment (cupric acid-containing white crystalline phosphate compound) 30 parts by weight   Vinyl acetate vinyl resin (Sekisui Chemical Co., Ltd., trade name Elex A) 10 parts by weight   Saturated polyester (product name Byron 103 manufactured by Toyobo Co., Ltd.) 5 parts by weight   Polyurethane elastomer 12 parts by weight           (Product name N-2304 manufactured by Nippon Polyurethane Industry Co., Ltd.)   Isocyanate curing agent 3 parts by weight   0.5 parts by weight of triethylenediamine   Solvent (toluene / methyl isobutyl ketone) 60 parts by weight

Then, by applying this infrared absorbing printing ink, an infrared absorbing printing ink layer 3 having a film thickness of 10 μm was provided on the surface 2 to form a bar code pattern.

The barcode pattern composed of the surface 2 and the infrared-absorbing printing ink layer 3 was indistinguishable from the naked eye. Further, when this bar code pattern was mechanically read using light having a wavelength of 780 nm, its PCS (print contrast signal) value was 0.75.

Further, a process ink having a property of transmitting infrared rays (trade name: FDOL manufactured by Toyo Ink Mfg. Co., Ltd.) was used to form 3 on the bar code pattern as shown in FIG.
An information carrying sheet 1 having a bar code pattern was obtained by forming various types of visible color (indigo, crimson, yellow) printing layers 4, 5 and 6 in a pattern.

In this information carrying sheet 1, the entire visible color (indigo, crimson, yellow) printing layers 4, 5 and 6 were visible, but the bar code pattern was hardly visible.

When the information carrying sheet 1 was also mechanically read using light having a wavelength of 780 nm, the PCS value thereof was 0.75, and the printed layers 4, 5,
It was the same value regardless of the presence or absence of 6.

Incidentally, FIG. 3 shows the transmittance of the infrared-absorbing printing ink layer 3 and the area where the printing layers 4, 5 and 6 overlap (black area 46 indicated by α in FIG. 2) with respect to the applied wavelength. FIG.

From this graph, it can be seen that the infrared absorbing printing ink layer 3 has an absorbing property in the infrared region but not in the visible region, and the black region 46 is visible. It can be confirmed that it has absorptivity in the region but not in the infrared region.

[Embodiment 2] In the information carrying sheet according to this embodiment, the coated paper colored as the surface is applied, and the infrared ray in which the coloring agent of the same color as the coloring agent used for the coloring is mixed. It is substantially the same as the information carrying sheet according to Example 1 except that a bar code pattern having a film thickness of 10 μm is formed by an absorptive printing ink.

Also in this information carrying sheet,
Although the entire visible color (indigo, crimson, yellow) print layer was in a visible state, the barcode pattern was hardly visible, so that the barcode pattern was not considered.

When this information-carrying sheet was also mechanically read using light having a wavelength of 780 nm, its PCS value was 0.75.

Example 3 The information carrying sheet according to this example is the same as the information carrying sheet described in Example 1 except that the infrared absorbing printing ink is changed to the following composition.

[0047] [Infrared absorbing printing ink]   Pigment (Asahi Glass Co., Ltd. product name Brillite crushed) 40 parts by weight   Vinyl chloride-vinyl acetate copolymer resin 10 parts by weight             (Sekisui Chemical Co., Ltd. product name S-REC A)   Saturated polyester (product name Byron 103 manufactured by Toyobo Co., Ltd.) 5 parts by weight   Polyurethane elastomer 12 parts by weight             (Product name N-2304 manufactured by Nippon Polyurethane Company)   Isocyanate curing agent 3 parts by weight   0.5 parts by weight of triethylenediamine   Solvent (toluene / methyl isobutyl ketone) 60 parts by weight

However, the above-mentioned pigment (commercially available from Asahi Glass Co., Ltd., brilliant crushed) has the following composition.

Al ₂ O ₃ 5.2 wt% P ₂ O ₅ 78.0 wt% MgO 5.4 wt% BaO 9.0 wt% CuO 1.7 wt% SrO 0.05 wt%

Also in this example, the surface and the bar code pattern were indistinguishable from each other and could not be visually recognized.
The wavelength of this barcode pattern is 780 nm.
When a machine reading was carried out using the above light, the PCS (print contrast signal) value was 0.70.

Example 4 The information carrying sheet according to this example is the same as the information carrying sheet described in Example 2 except that the infrared absorbing printing ink described in Example 3 is applied.

Also in this example, the surface and the bar code pattern were indistinguishable from each other and could not be visually recognized.
The wavelength of this barcode pattern is 780 nm.
When a machine reading was carried out using the above light, the PCS (print contrast signal) value was 0.70.

[0053]

According to the invention of claim 1 or 2 , it becomes difficult to visually recognize the mark by the base material forming the surface of the information carrying sheet and the printing ink layer formed on the base material, and
A combination of the above-mentioned base material, which is made of a material having infrared reflectivity on one side and an infrared ray absorbing material on the other side, and the mark enables mechanical reading by infrared rays.

According to the invention of claim 3 , a pattern such as a character is appropriately overprinted on a mark such as a bar code pattern by a process ink having absorptivity in the visible region and not absorbing infrared rays. , I don't even notice the barcode pattern.

[0055]

[Brief description of drawings]

FIG. 1 is a schematic partial perspective view of an information carrying sheet according to a first embodiment.

FIG. 2 is a partial cross-sectional view of the information carrying sheet according to the first embodiment.

FIG. 3 is a graph showing the bar code pattern of the information carrying sheet according to Example 1 and the transmittance of the printed layer with respect to the applied wavelength.

[Explanation of symbols]

1 Information carrying sheet 2 surface 3 Infrared absorbing printing ink layer 4 printing layers 5 printing layers 6 printing layers

Front page continuation (72) Inventor Tomohiko Yoshimura 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (56) Reference JP-A-3-275389 (JP, A) JP-A-63-307996 ( (58) Fields investigated (Int.Cl. ⁷ , DB name) B42D 5/00-15/10

Claims (3)

(57) [Claims] 1. An infrared-reflective printing ink layer having a surface having an infrared-reflecting property and a machine-readable mark composed of an infrared-absorbing printing ink layer having a color similar to that of the surface. An information-bearing sheet comprising Fe ²⁺ and / or Cu ²⁺ and a phosphate-based white crystalline powder containing phosphorus pentoxide as a main component. 2. An infrared-reflective surface, and a machine-readable mark composed of an infrared-absorbing printing ink layer having a color similar to that of the surface, wherein the infrared-absorbing printing ink layer comprises: A glass-based powder material containing Fe ²⁺ and / or Cu ²⁺ , wherein the glass-based powder material is contained in an amount of 80% by weight or less in the composition excluding the solvent of the infrared absorbing printing ink. Characteristic information carrying sheet. 3. The information carrying sheet according to claim 1, wherein a printing layer having no infrared absorption is provided on the machine-readable mark.