JP2008114380A - Printed matter applied with forgery-preventing measure and judging method of authenticity thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printed matter applied with forgery-preventing measures which make forgery and duplication difficult and moreover facilitate the determination of authenticity. <P>SOLUTION: The intaglio printed matter is applied with the forgery-preventing measures having a latent image part which is constituted of a liner-patterned projection including a printing image having a prescribed pitch and a line width and extending in one direction and a background which is constituted of a liner-patterned projection including a printing image having almost the same pitch and the line width as the printing image of the latent image part and extending in the direction intersecting the printing image of the latent image part. The printing images are formed partially at least of a first ink which contains a lanthanoid rare-earth compound. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to securities such as stock certificates and gift certificates, and printed materials such as seals and tags for products, and a method for determining the authenticity of such printed materials.

  Traditionally, in addition to securities such as stock certificates, gift certificates, credit cards, and even seals and tags for products, printing with elaborate printing technology (intaglio printing) to prevent unauthorized use due to counterfeiting and duplication Etc.) is generally applied. However, in view of the frequent occurrence of unauthorized use due to counterfeiting / duplication in recent years, special anti-counterfeiting measures have been taken in addition to these sophisticated printing.

  Examples of the above-mentioned special anti-counterfeiting methods include, for example, a method of attaching a hologram, a method of applying a material or an image that develops color by ultraviolet rays, and a method of judging authenticity by irradiating ultraviolet rays, and a line-like uneven pattern having different line directions on the metal foil layer. A method of pasting an image body with a so-called opal effect on securities, etc., where the shading and brightness of the line-shaped uneven pattern group changes when the viewing angle is changed by forming an embossed pattern of multiple groups is there.

  In addition, as one of the technologies using elaborate printing technology, a latent image pattern consisting of fine line-shaped convex portions with a fine pitch is printed on securities, etc., and it looks like a simple strip when viewed from above. There is an anti-counterfeiting technology (intaglio printed matter) using the fact that a latent image pattern appears when a securities is tilted or observed from a different viewpoint (see Patent Document 1).

  However, recently, the hologram technology and the technology for determining authenticity by ultraviolet irradiation have been generalized, and forgery / replication has become relatively easy. In addition, the technique using the above-mentioned opal effect can relatively easily read a line shape, and forgery and duplication have been facilitated with a reading technique and a machine.

  Furthermore, the intaglio printed matter having the latent image pattern composed of the line-shaped convex portions needs to be printed with dark ink because the latent image portion needs to have contrast when viewed obliquely. The intaglio printed material has a heavy thickness in which gradation is expressed by the depth, width, and interval of the image line, and the technique and equipment of the engraver are not generalized, so that it is difficult to reproduce by intaglio printing. However, when the pattern of the latent image portion itself is relatively simple, there is a problem that a certain degree of reproduction (copying) including a feeling of touch is possible by overlapping toner several times by color copying or the like. there were.

  In this case, when a light intaglio printed material is used, the color copy reproduces the color by multiplying four colors, so that the toner cannot be deposited, and therefore the effect of preventing forgery (copying) is enhanced. However, the intaglio printed material having the latent image pattern as described above has a problem that the contrast of the latent image portion is insufficient and a sharp visualization effect of the latent image portion cannot be obtained.

  Therefore, a technique for forming a light intaglio print having a latent image pattern using a fluorescent material that emits visible light when irradiated with ultraviolet rays as an intaglio ink has been introduced. In this case, when the intaglio printed matter having the latent image pattern is irradiated with ultraviolet rays, the image portion emits light, and a pattern such as a character in a high contrast portion appears to appear, and can be used as a forgery prevention technique (see Patent Document 2). ).

  On the other hand, there are inks that exhibit different hues under different light sources. This is a material made of ink using a material characterized by spectral characteristics (generally called metameric material). For example, the hue when viewed under sunlight is different from the hue when viewed under fluorescent light. Based on this, it is considered that true / false determination is possible (see Patent Documents 3 and 4).

However, the above materials are generally thin in hue, and it is difficult to tell the difference in hue unless a large amount of material is contained in the ink or the printing film thickness is increased, so usually used printing methods such as offset printing and gravure printing. However, there is a problem that authenticity determination as a forgery-preventing printed matter becomes difficult.
Japanese Patent Laid-Open No. 2002-166689 JP-A-2005-335107 Japanese Patent Laid-Open No. 10-278460 JP 2000-327978 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a printed matter that is difficult to forgery / reproduce and that is provided with a forgery prevention measure that can easily determine authenticity.

  The invention according to claim 1 is substantially the same as the latent image portion including a line-shaped convex portion including a line having a predetermined pitch and line width and extending in one direction, and the image line of the latent image portion. In a printed matter that has been provided with anti-counterfeit measures having a pitch and a line width and a background portion composed of line-shaped convex portions including an image line extending in a direction intersecting the image line of the latent image portion, At least a part of the image line is formed of a first ink containing a lanthanoid rare earth compound.

  The invention according to claim 2 is characterized in that the lanthanoid rare earth compound is selected from the group consisting of oxides, carbides, chlorides, fluorides, sulfides and nitrides of lanthanoid rare earth elements. A printed matter on which the forgery prevention measure according to Item 1 is applied.

The invention according to claim 3 is the printed matter subjected to the forgery prevention measure according to claim 2, wherein the lanthanoid rare earth compound is Ho ₂ O ₃ .

  According to a fourth aspect of the present invention, a part of the line-shaped convex parts constituting the latent image part and the background part is formed of the first ink, and the other part is 3 of blue, green and red. A line formed with a second ink having a hue that matches the hue of the first ink when irradiated with light from a light source having a light emitting characteristic at a wavelength, and the second ink is under sunlight The printed matter is provided with a forgery prevention measure according to any one of claims 1 to 3, wherein the printed matter is formed so as to form a desired pattern.

  According to a fifth aspect of the present invention, when the printed matter according to any one of the first to fourth aspects is irradiated with light from a light source having emission characteristics of blue, green, and red, the printed matter is applied to the printed matter. The hue of the first ink is changed as compared with the case of irradiating with sunlight, and when the printed matter is viewed from an oblique direction, it is determined that the latent image portion is easily recognized as authentic. This is a method for determining the authenticity of printed matter.

  In the printed matter subjected to the forgery prevention measure of the present invention, at least a part of the image line included in the line-shaped convex portions constituting the latent image portion and the background portion is formed with the first ink containing a lanthanoid rare earth compound. ing. The hue of the first ink is a light color having a low contrast difference with a printing substrate such as fine paper under sunlight, but is irradiated with light from a light source having emission characteristics at three wavelengths of blue, green, and red. Below, it becomes a hue with a comparatively high contrast difference with a printing base material. Therefore, when the printed matter is irradiated with sunlight, a light-colored simple strip pattern is only seen when viewed from the front or obliquely. On the other hand, when this printed matter is irradiated with light from a light source that emits light at three wavelengths of blue, green, and red, it looks like a fine pattern when viewed from the front, but when viewed from an oblique direction. The latent image portion composed of the line-shaped convex portions can be visually recognized.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing an embodiment of an intaglio printed material to which a forgery prevention measure of the present invention is applied. 2A is a view showing the intaglio printed matter of FIG. 1 viewed from the front under sunlight, and FIG. 2B is the oblique view of the intaglio printed matter of FIG. 1 from the viewpoint A direction under sunlight. FIG. FIG. 3A is a diagram showing the intaglio printed matter of FIG. 1 viewed from the front under a three-wavelength fluorescent lamp, and FIG. 3B is a perspective view of the intaglio printed matter of FIG. 1 under a three-wavelength fluorescent lamp. It is a figure which shows the case where it sees diagonally from A direction. FIG. 4 is a plan view showing another embodiment of the intaglio printed matter to which the forgery prevention measure of the present invention is applied.

  Although the printed matter according to the present invention can be produced by intaglio printing, screen printing, or the like, the intaglio printed matter will be typically described below.

  An intaglio printed matter 1 shown in FIG. 1 is composed of a line-shaped convex portion including a horizontally extending image line 11 arranged so as to form a letter “convex” on a printing base material 10 such as fine paper. The latent image portion 21 and the background portion 22 formed of a line-shaped convex portion including the image line 12 extending in a direction perpendicular to the image line 11 in a region other than the latent image portion 21.

  The line 11 of the line-shaped convex portions constituting the latent image portion 21 has a pitch P1 and a line width W1. The line 12 of the line-shaped convex part constituting the background part 22 has a pitch P2 and a width W2 substantially the same as the line 11. The pitches P1 and P2 of the image lines 11 and 12 are set to a range of 0.1 to 1.0 cm, and the line widths W1 and W2 are set to a range of 0.02 to 0.6 mm. More preferably, the pitches P1 and P2 are set to 0.25 cm, and the line widths W1 and W2 are set to 0.1 mm. The height (the amount of fill) of the image lines 11 and 12 is determined according to the pitch and the line width, but is generally set in the range of 10 to 100 μm.

In the intaglio printed matter 1 in FIG. 1, the image lines 11 and 12 of the line-shaped convex portions constituting the latent image portion 21 and the background portion 22 are printed with an intaglio ink containing a lanthanoid rare earth oxide. Specific examples of the lanthanoid rare earth compound used in the present invention include Ho ₂ O ₃ , Nd ₂ O ₃ , NdCl ₃ , NdF ₃ , Nd ₂ F ₃ , Pr ₂ O ₃ , PrCl ₃ , and PrF _3. Can be mentioned.

Hereinafter, the intaglio printed matter 1 of the present invention using an intaglio ink containing Ho ₂ O ₃ as a lanthanoid rare earth compound will be described. This intaglio print 1 utilizes the fact that the lines 11 and 12 are light yellow when observed under sunlight 31, and the lines 11 and 12 are pink when observed under a three-wavelength fluorescent lamp 32. The anti-counterfeit effect is obtained. The principle will be described as follows.

It is known that the absorption spectrum of Ho ₂ O ₃ has sharp absorption peaks near wavelengths of 450 nm, 550 nm, and 650 nm. That is, Ho ₂ O ₃ absorbs light in the above wavelength range, but does not absorb much light in other wavelength ranges.

In contrast, sunlight exhibits high emission energy over almost the entire visible wavelength range. Since Ho ₂ O ₃ having the above absorption characteristics absorbs a considerable portion of sunlight, the image lines 11 and 12 are light yellow under sunlight 31 and the contrast difference with the printing substrate 10 is low. For this reason, under sunlight 31, the latent image portion 21 is displayed even when the intaglio printed material 1 is viewed from the front as shown in FIG. 2A or when viewed from the viewpoint A direction as shown in FIG. And the background portion 22 are difficult to distinguish. Therefore, under the sunlight 31, there is no visualization effect of the latent image portion 21, and the forgery prevention measure is not noticed.

On the other hand, light from a light source having emission characteristics at three wavelengths of blue, green, and red, specifically, light from a three-wavelength fluorescent lamp is blue (wavelength 450 nm), green (wavelength 540 nm), and red (wavelength 610 nm). High emission energy is shown in the 3 wavelength region. Ho ₂ O ₃ having the above absorption characteristics absorbs blue (wavelength 450 nm) emission and green (wavelength 540 nm) emission, but reflects red (wavelength 610 nm) emission without absorbing it. Under 32, the image lines 11 and 12 are pink, and the contrast difference from the printing substrate 10 is relatively high. Therefore, under the fluorescent lamp 32, as shown in FIG. 3A, when the intaglio printed material 1 is viewed from the front, the latent image portion 21 ′ and the background portion 22 ′ appear to be entirely pink stripes. When the intaglio printed matter 1 is viewed obliquely from the viewpoint A direction as shown in FIG. 3B, the latent image portion 21 ′ can be easily visually recognized. Therefore, when the printed matter is irradiated with light from a three-wavelength fluorescent lamp and viewed from an oblique direction, it can be determined that the latent image portion 21 'is easy to see, so that it can be determined to be authentic. is there.

FIG. 4 is a plan view showing another embodiment of the intaglio printed matter to which the forgery prevention measure of the present invention is applied. The arrangement of the image lines of the latent image portion 41 and the background portion 42 of the intaglio print 2 is the same as that of the intaglio print 1 shown in FIG. 1, but includes image lines formed using two types of ink. Thus, it differs from the intaglio printed matter 1 shown in the figure. That is, in this intaglio printed matter 2, the line-shaped convex portions constituting the latent image portion 41 and the background portion 42 are partly formed of the first ink containing a lanthanoid rare earth compound such as Ho ₂ O _3. Part of the second ink (lanthanoid) with a hue that matches the hue of the first ink (in this case, pink) when light is emitted from a light source that emits light at three wavelengths of blue, green, and red Image line formed with no rare earth compound). In the latent image portion 41 and the background portion 42, an image line formed only with the first ink and / or an image line formed only with the second ink is formed as necessary. The area | region of the 2nd ink is formed so that the desired pattern 43 distinguished from the area | region printed with the 1st ink which exhibits light yellow under sunlight may be made. In FIG. 4, a heart shape that covers a part of the latent image portion 41 and the background portion 42 is shown as an example of the pattern 43, but the region and shape of the pattern 43 are not particularly limited.

  As described above, the image line partially formed of the first ink and the other partially formed of the second ink uses the Zammel printing method among the intaglio printing methods. By changing the ink in a part of the ink, it can be formed without being interrupted.

  When this intaglio printed matter 2 is viewed under a three-wavelength fluorescent lamp 32, the hue of the pattern 43 and the hue of the image area formed by the first ink around the latent image portion 41 and the background portion 42 are the same. As a result of the match, the whole becomes pink, and the presence of the pattern 43 is not known. This corresponds to the state shown in FIG. For this reason, when the intaglio printed material 2 is viewed obliquely from the viewpoint A direction as shown in FIG. 3B, the latent image portion 41 can be easily visually recognized. Accordingly, when the printed matter is irradiated with light from a three-wavelength fluorescent lamp, the pattern 43 becomes invisible, and the latent image portion 41 can be easily recognized when viewed from an oblique direction. Therefore, there is an anti-counterfeit effect.

  Hereinafter, the present invention will be described in detail with specific examples.

[Example 1]
A first intaglio ink (oxidation polymerization type) containing a lanthanoid rare earth compound was prepared having the following composition.
[Composition of first intaglio ink]
Ho ₂ O ₃ 70 parts by weight Intaglio ink medium (manufactured by Toyo Ink Manufacturing Co., Ltd.) 30 parts by weight.

  White-quality fine paper is prepared as a printing substrate, and intaglio printing is performed on the printing substrate using a plate on which the intaglio latent image has been applied with the above-described intaglio ink to obtain an intaglio print as shown in FIG. It was.

  When this intaglio printed material is viewed in sunlight, the latent image portion and the background portion appear to be a pale yellow thin pattern as a whole, and there is no contrast even when the printed material is tilted, making it difficult to see the latent image portion. . On the other hand, when the intaglio printed material is viewed under a three-wavelength fluorescent lamp, the latent image portion and the background portion appear pink, and the latent image portion can be visually recognized when viewed from an oblique direction. Therefore, this printed matter can be used as an intaglio printed matter with anti-counterfeit measures.

[Example 2]
In addition to the first intaglio ink containing a lanthanoid rare earth compound used in Example 1, the following color matching intaglio ink was prepared as a second intaglio ink not containing a lanthanoid rare earth compound.
[Composition of second intaglio ink]
Intaglio ink (special color pink) (manufactured by Toyo Ink Manufacturing Co., Ltd.) 100 parts by weight.

  The first intaglio ink is used as the first color, the second intaglio ink is used as the second color, and the ink roller of each color is formed into a predetermined pattern on the printing substrate (white-based high-quality paper) by the Zammel intaglio printing method. Intaglio printing was performed using a plate with shaving and an intaglio latent image, and an intaglio print as shown in FIG. 4 was obtained.

  When this intaglio print is viewed under sunlight, a pink pattern is visible in the latent image portion and the background portion. On the other hand, when this intaglio printed material is viewed under a three-wavelength fluorescent lamp, the entire latent image portion and background portion appear to be pink strips, so that the pattern that was visible under sunlight cannot be seen, and more The latent image portion can be visually recognized when viewed from the direction. Therefore, it can be said that this printed matter is an intaglio printed matter in which anti-counterfeit measures are taken.

The top view which shows one Embodiment of the intaglio printed matter which applied the forgery prevention measure of this invention. The figure which shows the case where the intaglio printed matter of FIG. 1 is seen from the front under sunlight, and the figure which shows the case where the intaglio printed matter of FIG. 1 is seen diagonally from the viewpoint A direction under sunlight. The figure which shows the case where the intaglio printed matter of FIG. 1 is seen from the front under a three-wavelength fluorescent lamp, and the figure which shows the case where the intaglio printed matter of FIG. 1 is seen diagonally from the viewpoint A direction under a three-wavelength fluorescent lamp . The top view which shows other embodiment of the intaglio printed matter which gave the forgery prevention measure of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Intaglio printed matter, 10 ... Printing base material, 11, 12 ... Image line, 21, 21 '... Latent image part, 22, 22' ... Background part, 31 ... Sunlight, 32 ... Fluorescent lamp, 41 ... Latent Image part, 42 ... background part, 43 ... pattern.

Claims (5)

  A latent image portion composed of line-shaped convex portions having a predetermined pitch and line width and including an image line extending in one direction, and having substantially the same pitch and line width as the image line of the latent image portion; A printed matter having a forgery prevention measure having a background portion composed of a line-shaped convex portion including an image line extending in a direction intersecting the image line of the latent image portion, wherein at least a part of the image line is a lanthanoid Printed matter with anti-counterfeit measures characterized in that it is formed of a first ink containing a rare earth compound.   The anti-counterfeiting measure according to claim 1, wherein the lanthanoid rare earth compound is selected from the group consisting of oxides, carbides, chlorides, fluorides, sulfides and nitrides of lanthanoid rare earth elements. Printed material. The printed material with the anti-counterfeit measure according to claim 2, wherein the lanthanoid rare earth compound is Ho ₂ O ₃ .   The line-shaped convex portions constituting the latent image portion and the background portion are partly formed from the first ink and the other part from a light source having light emission characteristics at three wavelengths of blue, green, and red. It includes an image line formed of a second ink having a hue that matches the hue of the first ink when irradiated with light, and the second ink is formed to form a desired pattern under sunlight. A printed matter having the anti-counterfeit measure according to any one of claims 1 to 3.   When the printed matter according to any one of claims 1 to 4 is irradiated with light from a light source having light emission characteristics at three wavelengths of blue, green, and red, compared to when the printed matter is irradiated with sunlight. A method of determining authenticity of a printed matter, wherein the authenticity of the printed matter is determined when the hue of the first ink changes and the latent image portion is easily viewed when the printed matter is viewed from an oblique direction.

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