JP2016078273A - Antifalsifying medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifalsifying medium capable of determining authenticity with a simple work, even when a user does not know information such as a latent image in advance.SOLUTION: An antifalsifying medium comprises: a change image formation part 20 on which, plural patterns are formed so that, by changing an angle, an image of each pattern can be viewed; and a latent image formation part 30 on which a pattern is formed, the pattern becomes a visible state by a predetermined action, and the pattern is invisible under visible light. One (b) of the patterns formed on the change image formation part 20 is the same as a pattern (d) formed on the latent image formation part 30.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a forgery prevention technique using a technique in which visible information changes depending on a situation.

  Conventionally, security products such as securities, passports, ID certificates and the like that require high security have been used. When forgery occurs in such a security product, there is a risk of losing consumer confidence in the product as a whole, and in turn, for each company / organization, so various anti-counterfeit technologies have been implemented.

  Among various anti-counterfeiting techniques, information is usually hidden and cannot be visually confirmed, but a technique that can confirm a latent image by irradiating ultraviolet rays or infrared rays is widely used (see Patent Document 1). In this way, a technique that is not visible as it is and can be visually recognized by applying some action is also called a covert technique.

Japanese Patent No. 3544536

  When the covert technique as described above is used, it is necessary to make known information such as patterns and characters of the latent image to a person who performs authenticity determination in advance. However, if the information is not transmitted accurately, it may be judged that the correct one is false and the wrong one is true. For example, if the printed matter that was printed with colorless fluorescent ink as “OK” has been revised to the word “GENUINE”, and if the revised information has not been correctly communicated, it is not clear which word is true. It will disappear.

  Therefore, an object of the present invention is to provide a forgery prevention medium capable of determining authenticity by a simple operation without knowing information such as a latent image in advance.

In order to solve the above-described problem, in the first aspect of the present invention, a change image forming unit in which a plurality of patterns are formed so that an image of each pattern can be visually recognized by changing an angle;
It has a latent image forming portion that forms a pattern that is invisible in visible light and is visible by causing a predetermined action,
An anti-counterfeit medium is provided in which one of the patterns formed on the change image forming unit is the same as the pattern formed on the latent image forming unit.

  According to the first aspect of the present invention, the change image forming portion in which a plurality of patterns are formed so that the image of each pattern can be visually recognized by changing the angle, and the state is invisible under visible light. A pattern formed in the latent image forming unit, one of the patterns formed in the changed image forming unit has a latent image forming unit formed with a pattern that becomes visible by causing a predetermined action. Therefore, it is possible to judge the authenticity by recognizing the image formed as a latent image by a simple operation and confirming that the same image is the same as one of the change images. . That is, even if a person who determines authenticity does not know the information of the image itself in advance, the image can be determined by simple confirmation work, and authenticity can be determined.

  In the second aspect of the present invention, one of the patterns formed on the change image forming unit and the pattern formed on the latent image forming unit are formed using the same image. Features.

  According to the second aspect of the present invention, one of the patterns formed in the change image forming unit and the pattern formed in the latent image forming unit are formed using the same image, so Matching images can be represented in the change image forming unit and the latent image forming unit, and authenticity can be reliably determined.

  In the third aspect of the present invention, the pattern formed in the change image forming unit that is the same as the pattern formed in the latent image forming unit is formed so as to be visible when tilted from the front. It is characterized by being.

  According to the third aspect of the present invention, the pattern formed in the changed image forming unit that is the same as the pattern formed in the latent image forming unit is formed so as to be visible when tilted from the front. Therefore, it is possible to prevent the same pattern as the pattern formed on the latent image forming unit from being confirmed from the front.

  According to the present invention, it is possible to determine the authenticity of an anti-counterfeit medium by a simple operation without knowing information such as a latent image in advance.

It is a figure which shows the structure of the forgery prevention medium which concerns on one Embodiment of this invention. FIG. 6 is a diagram illustrating a relationship between a pattern visually recognized by a change image forming unit 20 and a direction. FIG. 4 is a diagram showing details of a change image forming unit 20. It is a figure which shows the comparative example in case the pitch of a 1st pattern and a 2nd pattern is the same. It is a flowchart which shows the manufacturing process of the forgery prevention medium which concerns on this embodiment. It is a figure which shows the state at the time of utilization of the forgery prevention medium which concerns on one Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
<1. Configuration of anti-counterfeit media>
FIG. 1 is a plan view showing a forgery prevention medium according to an embodiment of the present invention. In FIG. 1, 10 is a base material, 20 is a change image forming unit, and 30 is a latent image forming unit. The change image forming unit 20 and the latent image forming unit 30 can be formed on the surface of the substrate 10 by a predetermined method.

  The change image forming unit 20 records a change image in which a plurality of patterns are switched. In the present embodiment, the first pattern, the second pattern, and the third pattern are switched depending on the viewing angle. Here, the pattern means a visually recognizable expression such as a design, a pattern, a pattern, or a shape. Various techniques for switching a plurality of patterns to each other can be used to form the change image forming unit 20. The change image forming unit 20 uses an overt technique for forming information that can be recognized by human senses. All the patterns formed on the change image forming unit 20 can be visually recognized only by the act of tilting.

  First, three patterns to be formed on the change image forming unit 20 and one pattern to be formed on the latent image forming unit 30 are determined. One of the three patterns of the change image forming unit 20 is the same as the pattern of the latent image forming unit 30. In order to make them completely the same, it is preferable to use the same image data expressing a pattern. The other two patterns of the three patterns of the changed image forming unit 20 are different from the patterns of the latent image forming unit 30. At this time, it is preferable to adopt a clearly different pattern so that the difference in pattern can be clearly recognized. Of the three patterns of the change image forming unit 20, the image formed so as to be recognized when viewed from the front and not recognized when tilted is not recognized when viewed from the first pattern, and tilted. The images formed so as to be recognized sometimes are referred to as a second pattern and a third pattern.

  Although omitted in FIG. 1, characters, designs, and the like are printed on the substrate 10 other than the changed image forming unit 20 and the latent image forming unit 30 with ordinary ink, so that the visible light is not visible. It is formed in a visible state.

  The latent image forming unit 30 is realized by applying fluorescent printing on the substrate 10 that is invisible under visible light and emits visible light when irradiated with infrared rays. That is, the third pattern shown in FIG. 1D (in the example of FIG. 1D, the form of the letter “A”) is printed with infrared light emitting ink.

  Next, pattern formation in the change image forming unit 20 will be described. The change image forming unit 20 is formed with three patterns, a first pattern, a second pattern, and a third pattern shown in FIGS. The first pattern is a line-shaped pattern as shown in FIG. Here, “line” means “a group of parallel lines in which a plurality of straight lines having a certain width are arranged at a pitch (interval) of a predetermined width (for example, two to three times the width of the straight line)”. is there.

  As shown in FIG. 1C, the second pattern expresses the shape of the letter “Z” as a whole by unevenness. The second pattern “Z” is shown in a colored state for convenience of explanation, but is actually a collection of irregularities of colorless (same color as the base material 10). That is, the line segment along the left-right direction in the drawing expresses the concave portion or the convex portion. The first pattern shown in FIG. 1B and the second pattern shown in FIG. 1C are formed on the change image forming unit 20 so as to overlap the first pattern printed with colored ink. The

  The pitch of the lines of the first pattern (interval between the line segments) and the pitch of the irregularities of the second pattern (interval between the recesses and recesses, or the interval between the protrusions and the protrusions) are formed in different states. ing. Therefore, when viewed from directly above the first pattern, which is a printed line pattern, only the first pattern is visible. The second pattern “Z” shown in FIG. 1C is a concavo-convex pattern and is formed in a line shape, and the pitch (the interval between the concave portion and the concave portion, or the interval between the convex portion and the convex portion). ) Is 1.5 times the pitch of the first pattern which is a printed line pattern.

  In the change image forming unit 20, the first pattern and the second pattern are in a parallel state where the angle at which the lines intersect is 0 degrees, that is, in a parallel state. Since the pitch of the lines of the first pattern and the second pattern is different by a half pitch (1/2 pitch), although not shown, the first convex portion constituting the second pattern and the fourth The first line and the sixth line of the first line printed with the first pattern overlap with the convex part.

  An example of the third pattern is shown in FIG. The third pattern is also formed in the latent image forming unit 30 as described above. The change image forming unit 20 and the latent image forming unit 30 are different in the manner of forming the third pattern. As described above, the latent image forming unit 30 is formed by fluorescent printing with infrared light emitting ink. On the other hand, in the change image forming unit 20, the third pattern is printed with ink that does not conceal the ink that forms the first pattern, such as colorless and transparent ink that reflects at a special angle, or light-colored ink. Is done. In the third pattern, as shown in FIG. 1D, the letter “A” is embedded in the rectangular fill pattern, but the letter “A” is reversed. May be.

  A method of visually recognizing a plurality of patterns in the change image forming unit 20 will be described with reference to FIG. FIG. 2 shows a case where the observer observes the change image forming unit 20 from the direction of the arrow K (K1, K2, K3) in a state where the forgery prevention medium 1 having the change image forming unit 20 is placed in a horizontal position. It shows how it is visually recognized.

  When the change image forming unit 20 is observed from the front (directly above) direction K1 of the forgery prevention medium 1, only the first pattern shown in FIG. 1B is clearly observed. Since the 2nd pattern is formed by unevenness, it cannot be visually recognized from the front direction. Further, the third pattern “A” cannot be visually recognized because it is printed with colorless and transparent or light-colored ink.

  Next, when the change image forming unit 20 is observed from the oblique direction K2, the third pattern “A” is clearly visually recognized, and the images of the first pattern and the second pattern “Z” are faint. It is in a state that is visually recognized. When the change image forming unit 20 is observed from the oblique direction K3 that is further closer to the forgery prevention medium 1, the image “A” that is the third pattern and the image of the line that is the first pattern are not visually recognized. Only the image of the second pattern “Z” is clearly visible.

  FIG. 3 is a diagram illustrating details of the change image forming unit 20. The relationship between the first pattern and the second pattern in the change image forming unit 20 will be described with reference to FIG. When a part of the change image forming unit 20 is cut out and enlarged, as shown in FIG. 3, a colored first pattern (thick line) by printing and a second pattern (unevenness) for generating a latent image overlap each other. ing.

  In FIG. 3, the thick line indicates each line segment of the 10,000 lines constituting the first pattern. A solid line parallel to each line segment of the first pattern indicates a convex part of the second pattern, and a broken line parallel to each line segment of the first pattern indicates a concave part of the second pattern. Is shown. In the present embodiment, the pitch ratio of the first line of the first pattern and the pitch ratio of the convex portions (or concave portions) of the second pattern is 1: 1.5, so the first pattern of the first pattern After the first line and the first convex part of the second pattern coincide with each other, the sixth line of the first pattern coincides with the fourth convex part of the second pattern. When the change image forming unit 20 is observed in such a state from the direction indicated by the arrow K3, three lines out of the first pattern lines are visually recognized as shown in FIG. 3B. This is because some of the lines of the first pattern are hidden by the convex portions of the second pattern.

  For comparison, FIG. 4 shows a case where the first pattern printed with colored ink by printing and the second pattern of the concavo-convex shape are formed to overlap and have the same pitch. In the second pattern, a plurality of convex portions indicated by solid lines and a plurality of concave portions indicated by broken lines are formed in parallel. Since the first pattern shown in FIG. 4 and the second pattern have the same pitch of the lines and the pitch of the concave and convex portions (or convex portions), the first line of the first pattern and the second pattern When the first recesses of the two patterns match, the other lines of the first pattern and the other recesses of the second pattern all match. When such a state is observed from the direction indicated by the arrow K3, the lines of the first pattern are hidden by the convex portions of the second pattern, and no change image forming unit 20 is visually recognized.

  FIG. 4B is a diagram in which FIG. 4A is observed obliquely from a position close to the anti-counterfeit medium 1 (see the observation direction K3 in FIG. 2), but in front of the convex portion of the second pattern (observation). Only the first pattern that is not obstructed by the convex portion in front of the first pattern is observed. In the example of FIG. 4B, no single line segment of the first pattern is visually recognized.

<2. Production of anti-counterfeit media>
Next, a method for manufacturing the anti-counterfeit medium shown in FIG. 1 will be described. FIG. 5 is a flowchart showing an outline of a method for manufacturing a forgery prevention medium according to the present embodiment. First, preparation of the first pattern is performed in order to produce a first line-shaped pattern (step S10). Specifically, the line screen and the unexposed film for making a plate are brought into close contact with each other and exposed from the line screen side so that the width of the solid line and the width of the space becomes 1: 2, thereby producing a line pattern original plate. The line pattern original plate is exposed according to the size of the change image forming unit 20 to produce a printing plate as a printing plate (step S20). Subsequently, a line-shaped first pattern is formed by a known printing method such as offset printing using the produced printing plate (step S30). As a result, a first line-shaped pattern is formed in the change image forming unit 20.

  Next, image data of the third pattern “A” is prepared (step S40). When the image data of the third pattern “A” is prepared, the third pattern for the change image forming unit 20 is made (step S50). Specifically, a printing plate for forming a third pattern that becomes a part of the change image forming unit 20 is produced based on the image data of the third pattern “A”.

  More specifically, first, an original plate for plate making is prepared from the plate based on the image data of the third pattern “A”. Then, exposure is performed according to the size of the base material 10 with the prepared master for plate making, and a printing plate which is a printing plate is prepared.

  In step S50, the third pattern plate making is performed, and when the third pattern printing plate is obtained, the third pattern "A" is formed (step S60). Specifically, the third pattern “A” is printed at the position where the changed image forming unit 20 is formed on the base material 10 so as to overlap the first pattern printed in step S30.

  Various known methods such as offset printing can be used as the third pattern printing method. For the printing of the third pattern, colorless and transparent ink is used in which the printed surface reflects light when the printed material is at a predetermined angle. As described above, in addition to the colorless and transparent ink, printing may be performed under the first pattern (on the base material 10 side) with an ink having a strong contrast with the first pattern. In this case, an image generated by the first pattern and the third pattern is visually recognized in two colors.

  In this embodiment, pearl ink is used as colorless and transparent ink. Here, the pearl ink which is a colorless and transparent ink will be described. The pearl ink is called pearl ink because the surface of the ink after printing has a pearly luster. Pearl ink is made using pigments of guanine microcrystals collected from the surface of freshwater fish scales and carbonate / arsenate-based materials. Each of these pigments is a flaky crystal, and when the light strikes the crystal surface, it is regularly multiple-reflected, and thus exhibits a gloss like a pearl surface. When used as a printing ink, the surface of the dried ink is transparent and has the reflective properties as described above.

  Next, image data of the second pattern “Z” is prepared (step S70). When the image data of the second pattern “Z” is ready, the second pattern for the change image forming unit 20 is made (step S80). Specifically, a printing plate for forming the second pattern “Z” that becomes a part of the change image forming unit 20 is prepared based on the image data of the second pattern “Z”.

  When the second pattern is made in step S80 and the second pattern printing plate is obtained, the second pattern “Z” is formed (step S90). Specifically, the second pattern “Z” is formed at the position where the change image forming unit 20 is formed on the base material 10 on which the first pattern and the third pattern have already been formed by printing.

  The formation of the first pattern in step S30, the formation of the third pattern in step S60, and the formation of the second pattern in step S90 are performed on the formation position of the change image forming unit 20 that is the same position. The first to third patterns can be formed by changing the form of processing for the same position.

  Next, details of the formation of the second pattern will be described. The second pattern is a concavo-convex formation pattern, which may be a character pattern or a pattern pattern. As described above, the present embodiment is configured to have the shape of the letter “Z” as a whole. The pitch is determined in relation to the first pattern described above. Usually, the pitch of the second pattern is made wider than the pitch of the first pattern. An intaglio is prepared in order to partially pressurize the printed material to form the unevenness as the second pattern. Therefore, a film original for producing an intaglio is prepared. Intaglio plate making means includes a method of making a recess by etching with a chemical and a method of making a groove mechanically, and the second pattern forming means (pressing die) is made by either method.

  In step S90, a second pattern forming unit that is a push mold is attached to the embossing machine, and in step S60, the second pattern is formed on the change image forming unit 20 on which the third pattern is formed. In order to impart the embossing property to the substrate 10, it is preferable to use a paper having long fibers and relatively rough properties as the substrate 10. When the material of the base material cannot be selected, it is preferable to perform embossing after moistening the embossed portion and softening the embossed surface.

  In addition, using the image data of the third pattern “A” prepared in step S40, the latent image forming unit 30 performs plate making for forming a latent image (step S100). Specifically, a plate for forming the latent image forming unit 30 is created based on the image data of the third pattern “A”. In the case where the latent image forming unit 30 is formed by offset printing with fluorescent ink (infrared light emitting ink) that emits light by infrared rays, a plate for offset printing is produced.

  In step S40, the latent image plate-making is performed, and when the plate for the third pattern “A” is obtained, a latent image pattern is formed (step S110). In the case of emitting light by infrared rays, offset printing is performed at a predetermined position on the substrate 10 with fluorescent ink that emits infrared rays, and the latent image forming unit 30 is formed.

  The formation of the third pattern on the changed image forming unit 20 in step S60 and the formation of the third pattern on the latent image forming unit 30 in step S110 are performed using the common image data prepared in step S40. Therefore, the pattern of the same mode is surely formed.

<3. Use of anti-counterfeit media>
The authenticity determination method of the forgery prevention medium manufactured as mentioned above is demonstrated. FIG. 6 is a diagram illustrating a state when the anti-counterfeit medium 1 is used. Under normal visible light, as shown in FIG. 6A to FIG. 6C, the image of the third pattern that is specifically formed does not appear in the latent image forming unit 30. 6A to 6C, the position of the latent image forming unit 30 is indicated by a broken-line rectangle.

  When the anti-counterfeit medium 1 is viewed from the front under normal visible light, as shown in FIG. 6A, an image of the first line pattern is visually recognized in the change image forming unit 20. . When the anti-counterfeit medium 1 is tilted slightly under normal visible light, the third pattern image “A” is visually recognized in the change image forming unit 20 as shown in FIG. 6B. . When the anti-counterfeit medium 1 is further tilted under normal visible light, the second pattern image “Z” is visually recognized in the change image forming unit 20, as shown in FIG. 6C. .

  At this time, it cannot be determined whether the forgery prevention medium 1 is genuine or fake. Here, the latent image forming unit 30 is caused to emit light by irradiating the anti-counterfeit medium 1 with infrared rays. Thereby, as shown in FIG. 6D, the image “A” of the third pattern is visually recognized in the latent image forming unit 30. Thus, the user recognizes that “A” is a pattern for proving authenticity. Then, as shown in FIG. 6B, it can be determined that the forgery prevention medium 1 is authentic because the image “A” of the same pattern also appeared in the change image forming unit 20. it can.

  The anti-counterfeit medium according to the present invention can be applied to various things such as banknotes, identification cards, passports, cash vouchers, gift certificates, coupon tickets, admission tickets, tickets, coupon tickets, stickers, labels, packages, tags, and the like. .

  As the base material of the anti-counterfeit medium, various materials can be used as long as they can form a plurality of patterns, such as paper, synthetic resin, and metal.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above embodiment, three patterns are formed as patterns to be formed in the change image forming unit 20, but any number of patterns may be formed as long as there are two or more.

  In the above embodiment, a character-shaped pattern such as “A” or “Z” is used as a pattern to be formed in the change image forming unit 20. However, the shape can be determined whether or not they are the same. Anything is acceptable.

  In the above embodiment, the overt technique for realizing the change image forming unit 20 uses printing with different inks and formation of the concavo-convex shape. However, the present invention is not limited to this. Various well-known overt techniques such as a latent image using the image can be used. For example, the technology described in Japanese Patent No. 4604209 can be applied as a latent image using the difference in glossiness.

  In the above embodiment, fluorescent printing using infrared light-emitting ink is used as a covert technique for realizing the latent image forming unit 30. However, the present invention is not limited to this. It is possible to use various known covert techniques such as infrared latent image printing. For example, the technique described in Japanese Patent No. 3544536 can be applied as infrared latent image printing.

DESCRIPTION OF SYMBOLS 1 ... Anti-counterfeit medium 10 ... Base material 20 ... Change image formation part 30 ... Latent image formation part

Claims (3)

A change image forming unit in which a plurality of patterns are formed so that an image of each pattern can be visually recognized by changing the angle;
It has a latent image forming portion that forms a pattern that is invisible in visible light and is visible by causing a predetermined action,
An anti-counterfeit medium, wherein one of the patterns formed on the change image forming unit is the same as the pattern formed on the latent image forming unit.   The counterfeit according to claim 1, wherein one of the patterns formed on the change image forming unit and the pattern formed on the latent image forming unit are formed using the same image. Prevention medium.   The pattern formed on the change image forming unit that is the same as the pattern formed on the latent image forming unit is formed so as to be visible when tilted from the front. The forgery prevention medium according to claim 2.

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