JP2009045779A - Antiforging medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily discriminate authenticity without being limited by an observational direction. <P>SOLUTION: In a plurality of projecting parts 11, each of which is formed on a sheet base material 2, and the side 11a of each of which has a character part mark 12 or a background part mark 13, the side 11a of the projecting part is composed of a plurality of peripherally split regions 14a-14d under the condition that the character part marks 12 and the background part marks 13 in every region of a plurality of the regions 14a-14d have marking colors 12a-12d and 13a-13d different from one another. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anti-counterfeit medium such as an anti-counterfeit sheet, and more particularly to an anti-counterfeit structure in which information that is visually recognized changes in accordance with an observation direction.

  In the past, counterfeit crimes have frequently occurred in securities such as prepaid cards, various admission tickets, gift certificates and stock certificates because they are widely distributed and can be exchanged relatively easily. In particular, in recent years, with the improvement and popularization of copying machines such as color copiers, counterfeit products that cannot be easily distinguished from genuine products can be manufactured relatively easily, and countermeasures against counterfeiting are required. Yes. Moreover, measures against counterfeiting are required not only for the above-mentioned securities but also for banknotes.

  As one of countermeasures against such counterfeiting, a technique that enables authenticity determination of securities and banknotes using a latent image is considered, and is disclosed in, for example, Patent Document 1.

  The technique disclosed in Patent Document 1 includes a plurality of printed lines on a sheet base material, parallel to the printed lines, a part extending in a direction orthogonal to the printed lines, and a cross section The raised relief lines are provided to raise the latent image depending on the observation direction. When the substrate is viewed from the front, all the printed lines are visible. However, when the observation direction is changed to a direction perpendicular to the printed lines and the relief lines, the portion of the printed lines where the relief lines extend is visible behind the extended relief lines. While not possible, the other parts of the printed line remain visible. Thereby, a latent image corresponding to the shape of the relief line can be raised.

In this way, in the case of a sheet base material provided with a relief line with a raised cross section, the printed information including the printed line printed on the surface is copied, but the raised shape of the relief line is reproduced. Can not. For this reason, even when the observation direction of the copy is changed, the latent image does not appear, thereby making it possible to determine authenticity.
JP 2000-313161 A

  However, as described above, on the sheet base material, a plurality of printed lines, parallel to the printed lines, a part extends in a direction perpendicular to the printed lines, and the cross-section is raised. In the case where a relief line is provided and a latent image is raised by the printed line and the relief line, the latent image only appears when viewed from a direction perpendicular to the printed line and the relief line. It is hard to say that it is easy to determine authenticity by image. In particular, when the observation direction is limited, there is a possibility that the authenticity determination by the latent image cannot be performed.

  The present invention has been made in view of the problems of the conventional techniques as described above, and provides an anti-counterfeit medium that can easily perform authenticity determination without being limited to an observation direction. With the goal.

In order to achieve the above object, the present invention provides:
Having a convex portion formed with a side surface on the substrate;
The side surface includes a plurality of regions divided in the circumferential direction, and information having different colors for each of the plurality of regions is displayed.

  In the present invention configured as described above, when the substrate is observed from the surface, either the information displayed on the side surface of the convex portion is either all visible or all is invisible. It becomes a state. When all the information displayed on the side surface of the convex portion is visible, the information displayed on the side surface of the convex portion, that is, information having different colors for each of the plurality of regions divided in the circumferential direction of the side surface. All are visible. If the observation direction is changed from this state to a direction that forms an acute angle with respect to the substrate surface, only the region facing the observation direction among the plurality of regions divided in the circumferential direction of the side surface of the convex portion becomes visible. Only the information having the color displayed in the area is visually recognized.

  In this way, when the substrate is observed from the surface, all the information having different colors for each of the plurality of regions divided in the circumferential direction of the side surface of the convex portion is visible or displayed on the side surface of the convex portion. When all of the recorded information is invisible and is observed from a direction that makes an acute angle with the substrate surface, it is displayed in a region facing the observation direction among a plurality of regions divided in the circumferential direction of the side surface of the convex portion. The color of information that is visually recognized when the substrate is observed from the surface and when viewed from a direction that makes an acute angle with respect to the substrate surface, such that only information having the determined color is visible. Will be different. Here, the side surface of the convex portion is divided into a plurality of regions in the circumferential direction, and information having different colors is displayed for each of the plurality of regions, so that the observation direction forms an acute angle with respect to the substrate surface. Regardless of the direction of change, the visible color change as described above occurs.

  In addition, when the observation direction is changed to a direction parallel to the substrate surface in a state of forming an acute angle with respect to the substrate surface, a plurality of pieces divided in the circumferential direction of the side surface of the convex portion according to the observation direction. The visible area of the area changes, and this also causes a change in the color of the visually recognized information.

  As described above, in the present invention, the side surface of the convex portion formed on the base material is composed of a plurality of regions divided in the circumferential direction, and information having different colors for each of the plurality of regions is displayed. Because of the configuration, when the substrate is observed from the surface, all the information with different colors for each of the plurality of regions divided in the circumferential direction of the side surface of the convex portion is visible or displayed on the side surface of the convex portion. When all of the recorded information is invisible and is observed from a direction that makes an acute angle with the substrate surface, it is displayed in a region facing the observation direction among a plurality of regions divided in the circumferential direction of the side surface of the convex portion. The color of information that is visually recognized when the substrate is observed from the surface and when viewed from a direction that makes an acute angle with respect to the substrate surface, such that only information having the determined color is visible. And the observation direction should be Even if the direction is changed in any direction that forms an acute angle, the above-described change in the visually recognized color occurs, and the true / false discrimination is easily performed without being limited to the observation direction. be able to. In addition, since the plurality of areas in which information having different colors is displayed are obtained by dividing the side surface of the convex portion in the circumferential direction, the observation direction is based on an acute angle with respect to the substrate surface. Even when the direction is changed in a direction parallel to the material surface, the color to be visually recognized changes, and it is possible to determine the authenticity.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an anti-counterfeit sheet that is an embodiment of the anti-counterfeit medium of the present invention, (a) is a diagram showing the overall configuration, and (b) is an anti-counterfeit structure shown in (a). 10 is a diagram showing a detailed configuration of FIG. 10, (c) is a cross-sectional view taken along the line AA ′ shown in (b), (d) is a diagram showing a configuration of the convex portion 11 provided with the character mark 12, (e) Is a diagram showing the configuration of the convex portion 11 provided with the background portion mark 13, (f) is a view of the convex portion 11 for showing the detailed configuration of the character portion mark 12, and (g) is the background portion. It is the figure which looked at the convex part 11 for showing the detailed structure of the mark 13 from the front.

  As shown in FIG. 1, the forgery prevention sheet 1 of the present embodiment is configured by providing a forgery prevention structure 10 in a partial region of a sheet base 2 made of paper. The sheet base material 2 has a flat surface portion 3, an information printing region 4 is provided in a partial region of the flat surface portion 3, and a forgery prevention structure 10 is provided in another region. The anti-counterfeit sheet 1 configured in this manner can be used as an entrance ticket for a concert, for example. In this case, the contents of the concert, the venue name, the seat number, etc. are printed in the information printing area 4. In addition, before the information is printed in the information printing area 4 of the sheet base material 2, it may be possible to print a tint block or precolor the sheet base material 2 as a pre-print. In this case, it is necessary not to make it difficult to see the latent image by the forgery prevention structure 10.

  As shown in FIG. 1B, the anti-counterfeit structure 10 provided on the sheet base 2 includes a plurality of protrusions 11 formed in a matrix on the sheet base 2, and among the plurality of protrusions 11, A character mark 12 serving as information provided only on the convex portion 11 serving as a position expressing “T” as a latent image, and a convex portion 11 provided with no character mark 12 among the plurality of convex portions 11. It is comprised from the background part mark 13 used as the provided information. As shown in FIGS. 1C to 1E, the convex portion 11 has a shape in which the apex portion is removed from the cone, and the sheet base material 2 is 0.05 mm from the flat portion 3 side with an embossed plate or the like. The side surface 11a is formed by being recessed by about 0.1 mm, and the same surface as the flat surface portion 3 is the top portion 11b. The cross-sectional area gradually increases from the top portion 11b toward the depression direction of the sheet base material 2, and the bottom of the convex portion 11 has a circular shape with a diameter of 0.5 mm or less.

The character part mark 12 is a position where the height from the bottom of the side surface 11a of the convex part 11 which is a position expressing the latent image “T” among the plurality of convex parts 11 is the first height h _1. And is provided by printing over the entire circumference. Background section mark 13, the entire circumference at the level becomes the second height h ₂ position from the bottom of the side surface 11a of the protrusion 11 of the character portion mark 12 is not provided among the plurality of protrusions 11 It is provided by printing across. Here, the height h ₁ at which the character portion mark 12 is provided on the side surface 11 a of the convex portion 11 and the height h _{2 at} which the background portion mark 13 is provided are the height at which the background portion mark 13 is provided. h ₂ is lower than the height h ₁ at which the character mark 12 is provided.

  Further, as shown in FIGS. 1 (f) and 1 (g), the side surface 11 a of the convex portion 11 is divided into four regions 14 a to 14 d in the circumferential direction, and the character portion mark 12 is provided for each region 14 a to 14 d. The background mark 13 is composed of four mark colors 13a to 13d having different colors for each of the regions 14a to 14d. The mark color 12a and mark color 13a, the mark color 12b and mark color 13b in the region 14b, the mark color 12c and mark color 13c in the region 14c, and the mark color 12d and mark color 13d in the region 14d are the same color. .

  Note that the forgery prevention structure 10 illustrated in the present embodiment is formed with ten convex portions 11 each in length and width for the sake of simplicity of explanation. Characters that become latent images that can be lifted by the forgery prevention structure 10 can be made minute, and curves and the like can be easily expressed.

  Below, the manufacturing method of the forgery prevention sheet 1 comprised as mentioned above is demonstrated.

  First, the character part mark 12 and the background part mark 13 are each printed in a circular shape in the region of the sheet base material 2 where the forgery prevention structure 10 is provided. The character part mark 12 is printed at a position where a latent image “T” is formed in the 10 × 10 matrix area where the convex part 11 is provided, and the background part mark 13 is printed in a 10 × 10 matrix form. Printing is performed at a position in the area where the character mark 12 is not printed. The character part mark 12 and the background part mark 13 are similar to each other, and the diameter thereof is as described above when the convex part 11 is formed in the region where the character part mark 12 and the background part mark 13 are provided. Further, the diameter of the character mark 12 is smaller than the diameter of the background mark 13 so that the height of the background mark 13 is lower than the height of the character mark 12. The combination of the character mark 12 and the background mark 13 is set in advance according to the latent image (“T” in the present embodiment) that emerges from the forgery prevention structure 10 and is given as print data. The printing of the character mark 12 and the background mark 13 may be performed simultaneously with the pre-printing as described above, or may be performed after the pre-printing described above.

  Next, a plurality of convex portions 11 are formed by pressing an embossed plate from the flat surface portion 3 side of the sheet base material 2 to an area where the character portion mark 12 and the background portion mark 13 are printed. At this time, by forming the convex portion 11 so as to overlap the character portion mark 12 and the background portion mark 13, the character portion mark 12 and the background portion mark 13 are provided over the entire circumference of the side surface 11a of the convex portion 11, respectively. The resulting shape.

  As described above, the anti-counterfeit sheet 1 is manufactured, and then information corresponding to the application is printed on the information printing area 4 of the sheet base 2 and used.

  Below, the effect | action of the forgery prevention sheet 1 mentioned above is demonstrated.

  First, the operation when the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front, that is, from the normal direction of the flat portion 3 of the sheet base material 2 will be described.

  2A and 2B are diagrams for explaining the operation when the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front. FIG. 2A is a diagram viewed from the cross-sectional direction, and FIG. It is a figure which shows how the character part mark 12 and the background part mark 13 appear.

  When the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front, that is, from the normal direction of the plane part 3 as shown in FIG. 2A, the character part marks 12 provided on the plurality of convex parts 11 respectively. In addition, since the background mark 13 is not obstructed from the observation direction, all the character mark 12 and the background mark 13 are visually recognized as shown in FIG.

  Although the character part mark 12 and the background part mark 13 are provided so that the height from the plane part 3 is different from each other on the side surface 11a of the convex part 11, they are similar to each other, and the anti-counterfeit sheet 1 When viewed from the front, it is observed from the height direction, whereby the character mark 12 and the background mark 13 are recognized as substantially the same shape, and the marks of the same shape are formed side by side. It is recognized as a thing. As the convex portion 11 is finer, these are more easily recognized as substantially the same shape.

  In addition, when the forgery prevention sheet 1 shown in FIG. 1 is observed from the front, all the mark colors 12a to 12d constituting the character mark 12 are visually recognized for each of the convex portions 11, and each of the convex portions 11 is observed. All the mark colors 13a to 13d constituting the background mark 13 are visually recognized.

  Next, an operation when the observation direction with respect to the anti-counterfeit sheet 1 shown in FIG. 1 is changed from the front direction, that is, the direction that forms an acute angle from the normal direction of the flat portion 3 of the sheet base material 2 will be described.

  FIG. 3 is a diagram for explaining the operation when the observation direction with respect to the anti-counterfeit sheet 1 shown in FIG. 1 is changed from the front, and (a) changes the observation direction to the B direction in FIG. The figure which shows the appearance of the convex part 11 at the time of letting it be, (b) is the figure which shows the appearance of the convex part 11 when changing the observation direction to the C direction in FIG. 1, (c) is The figure which shows the appearance of the convex part 11 when changing an observation direction to the D direction in FIG. 1, (d) is the figure of the convex part 11 when changing the observation direction to the E direction in FIG. It is a figure which shows how to look.

  When the observation direction with respect to the anti-counterfeit sheet 1 shown in FIG. 1 is changed from the front, only the side where the side surface 11a faces the observation direction is visually recognized in the convex portion 11, and the opposite side is hidden in the convex portion 11. Will not be visible. Therefore, when the observation direction is changed to the B direction in FIG. 1, as shown in FIG. 3A, the region 14a of the four regions 14a to 14b divided on the side surface 11a faces the observation direction, and the character In the convex part 11 in which the part mark 12 is formed, the mark color 12 a part of the character part mark 12 is mainly visually recognized, and in the convex part 11 in which the background part mark 13 is formed, the mark color of the background part mark 13. The portion 13a is mainly visually recognized. Thereby, the character part mark 12 and the background part mark 13 are visually recognized by the color mainly composed of the mark colors 12a and 13a.

  When the observation direction is changed to the direction C in FIG. 1, as shown in FIG. 3B, the region 14b of the four regions 14a to 14b divided on the side surface 11a faces the observation direction, and the character In the convex part 11 in which the part mark 12 is formed, the mark color 12b part is mainly visually recognized in the character part mark 12, and in the convex part 11 in which the background part mark 13 is formed, the mark color in the background part mark 13 is marked. The portion 13b is mainly visually recognized. As a result, the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12b and 13b.

  When the observation direction is changed to the D direction in FIG. 1, as shown in FIG. 3C, the region 14c of the four divided regions 14a to 14b of the side surface 11a faces the observation direction, and the character In the convex part 11 in which the part mark 12 is formed, the mark color 12c part of the character part mark 12 is mainly visually recognized. In the convex part 11 in which the background part mark 13 is formed, the mark color of the background part mark 13 is marked. The portion 13c is mainly visually recognized. Thereby, the character part mark 12 and the background part mark 13 are visually recognized by the color mainly composed of the mark colors 12c and 13c.

  When the observation direction is changed to the E direction in FIG. 1, as shown in FIG. 3D, the region 14d of the four regions 14a to 14b divided on the side surface 11a faces the observation direction, and the character In the convex part 11 where the part mark 12 is formed, the mark color 12d part of the character part mark 12 is mainly visually recognized, and in the convex part 11 where the background part mark 13 is formed, the mark color of the background part mark 13 The portion 13d is mainly visually recognized. As a result, the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12d and 13d.

  Thus, when the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front, the character mark 12 and the background mark 13 are visually recognized in four colors of four mark colors 12a to 12d and 13a to 13d, respectively. In addition, when the observation direction with respect to the forgery prevention sheet 1 is changed to a direction that forms an acute angle from the front, the character part mark 12 and the background part mark 13 are observed among the four mark colors 12a to 12d and 13a to 13d, respectively. It will be visually recognized by the color of the mark color of the area facing the direction, and the visually recognized color will be changed by changing the observation direction in the character part mark part 12 and the background part mark 13. .

  Next, an operation when the observation direction is changed to a direction that forms an acute angle with respect to the forgery prevention sheet 1 will be described.

FIG. 4 is a diagram for explaining the operation when the observation direction for the forgery prevention sheet 1 shown in FIG. 1 is changed from the front, (a) is a view as seen from the cross-sectional direction, (b). Is a diagram showing an angle θ _{1 in the} observation direction with respect to the plane portion 3 when the background mark 13 becomes invisible, and (c) is a diagram showing a state in which the character mark 12 is viewed at the angle θ ₁ shown in (b). (D) is a view showing how the character mark 12 and the background mark 13 are seen when the anti-counterfeit structure 10 is viewed from the B direction in FIG. 1, and (e) is an anti-counterfeit structure 10 from the C direction in FIG. FIG. 5F shows how the character mark 12 and the background mark 13 appear when viewed, and FIG. 5F shows the character mark 12 and the background mark 13 when the anti-counterfeit structure 10 is viewed from the direction D in FIG. The figure which shows how it looks, (g) when the anti-counterfeit structure 10 is seen from the direction E in FIG. It is a diagram showing the appearance of the shaped portion mark 12 and the background portion mark 13.

When the observation direction with respect to the anti-counterfeit sheet 1 shown in FIG. 1 is changed from the state shown in FIG. 3, the angle formed by the observation direction with respect to the flat portion 3 of the sheet substrate 2 becomes more acute. And if the angle which the observation direction with respect to the plane part 3 of the sheet | seat base material 2 makes becomes smaller than angle (theta) _{1 as} shown in FIG.4 (b), the character part mark 12 provided in the side surface 11a of the convex part 11, and The background part mark 13 out of the background part mark 13 is hidden by the convex part 11 adjacent to the observation direction side of the convex part 11 provided with the background part mark 13 and becomes invisible. Note that the angle θ _{1 at which} the background mark 13 is hidden by the convex portion 11 and cannot be seen is the observation of the background mark 13 and the convex portion 11 provided with the background mark 13 as shown in FIG. The distance in the direction parallel to the plane part 3 between the end part of the top part 11b of the convex part 11 adjacent to the direction side is w ₁ , and the difference in height between the background mark 13 and the convex part 11 is t ₁ . Then, the angle θ ₁ = tan ⁻¹ (t ₁ / w ₁ ) is expressed.

On the other hand, in the character part mark 12, even when the angle formed by the observation direction with respect to the flat part 3 of the sheet base material 2 becomes an angle θ ₁ at which the background part mark 13 cannot be seen, as shown in FIG. Furthermore, it is not hidden by the convex part 11 adjacent to the observation direction side of the convex part 11 provided with the character part mark 12.

Therefore, when the observation direction with respect to the anti-counterfeit sheet 1 is changed to, for example, the B direction in FIG. 1 and the angle formed by the observation direction with respect to the flat portion 3 of the sheet base material 2 is smaller than θ ₁ , the side surface of the convex portion 11. Of the character mark 12 and the background mark 13 provided on 11a, all the character mark 12 and only the background mark 13 provided on the side surface 11a of the convex portion 11 that forms the foremost line in the observation direction are visible. As a result, as shown in FIG. 4D, the latent image “T” formed by the character mark 12 appears to appear. Further, at this time, since the side surface 11a of the convex portion 11 is viewed only on the observation direction side as described above, when the anti-counterfeit structure 10 of the anti-counterfeit sheet 1 is viewed from the B direction in FIG. The region 14a on the side surface 11a of the convex portion 11 is mainly visually recognized, whereby the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12a and 13a. .

Here, in the anti-counterfeit sheet 1 shown in FIG. 1, the character mark 12 constituting the latent image that emerges depending on the observation direction extends over the entire circumference of the side surface 11 a of the convex portion 11 formed on the sheet base material 2. Since the plurality of convex portions 11 are formed in a matrix, the observation is made from any direction as long as the angle between the plane portion 3 of the sheet base material 2 and the observation direction is smaller than θ _1. Even so, the latent image by the character mark 12 appears to appear.

  For example, when the observation direction with respect to the anti-counterfeit sheet 1 is changed to the C direction in FIG. 1, the latent image “T” formed by the character mark 12 appears to emerge as shown in FIG. become. Even in this case, the region 14b is mainly visually recognized on the side surface 11a of the convex portion 11, so that the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12b and 13b. Will be.

  Further, when the observation direction with respect to the anti-counterfeit sheet 1 is changed to the D direction in FIG. 1, the latent image “T” formed by the character mark 12 appears to emerge as shown in FIG. become. Even in this case, the region 14c is mainly visually recognized on the side surface 11a of the convex portion 11, so that the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12c and 13c. Will be.

  Further, when the observation direction with respect to the anti-counterfeit sheet 1 is changed to the E direction in FIG. 1, the latent image “T” formed by the character mark 12 appears to emerge as shown in FIG. become. Even in this case, the region 14d is mainly visually recognized on the side surface 11a of the convex portion 11, and accordingly, the character portion mark 12 and the background portion mark 13 are visually recognized in colors mainly including the mark colors 12d and 13d. Will be.

  Note that, in any of the above-described observations, the background mark 13 provided on the side surface 11a is formed in the projection 11 that forms the row in the forefront direction in the observation direction among the projections 11 formed in a matrix. Although it can be visually recognized, the number of the convex portions 11 is large, or the line width of the latent image constituted by the character portion marks 12 as shown in FIGS. It is only necessary to recognize that the background mark 13 is unrelated to the latent image by being thicker than the line width of If the latent image is obscured by the background portion mark 13 provided on the side surface 11a of the convex portion 11 that forms the foremost row in the observation direction, the character portion mark 12 that forms the latent image is displayed in the matrix. What is necessary is just to provide in the convex part 11 away from the circumference | surroundings among the several convex parts 11 formed in the shape.

If the angle formed between the flat surface portion 3 of the sheet base material 2 and the observation direction is smaller than θ _{1, the} background of the character portion mark 12 and the background portion mark 13 provided on the side surface 11a of the convex portion 11 as described above. Although the part mark 13 is hidden and cannot be seen, the angle formed by the plane portion 3 of the sheet base material 2 and the observation direction is further reduced, and the angle formed by the observation direction with respect to the plane portion 3 of the sheet base material 2 is as shown in FIG. becomes smaller than the angle theta ₂ (c), the even character portion mark 12 provided on the side surface 11a of the protrusion 11, the viewing direction of the convex portion 11 of the character portion mark 12 is provided It is hidden by the adjacent convex part 11 and cannot be seen. That is, when the angle θ formed by the observation direction with respect to the flat surface portion 3 of the sheet base material 2 is θ ₂ ≦ θ ≦ θ ₁ , the character portion mark 12 and the background portion mark 13 provided on the side surface 11a of the convex portion 11. Among them, only the character part mark 12 becomes visible, so that the latent image “T” appears to appear. Note that the angle θ _{2 at which} the character part mark 12 is hidden by the convex part 11 becomes invisible, as shown in FIG. 4C, the character part mark 12 and the observation of the convex part 11 on which the character part mark 12 is provided. The distance in the direction parallel to the plane part 3 between the end part of the top part 11b of the convex part 11 adjacent to the direction side is w ₂ , and the difference in height between the character part mark 12 and the convex part 11 is t ₂ . Then, the angle θ ₂ = tan ⁻¹ (t ₂ / w ₂ ) is expressed.

  Thus, when the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front, the character part mark 12 and the background part mark 13 are recognized as being formed side by side with the same shape mark. The character mark 12 and the background mark 13 are visually recognized in four colors of four mark colors 12a to 12d and 13a to 13d, respectively, and the observation direction with respect to the anti-counterfeit sheet 1 is changed to a direction that forms an acute angle from the front. In this case, the latent image “T” by the character mark 12 appears and the character mark 12 constituting the latent image “T” has a mark color corresponding to the observation direction among the mark colors 12a to 12d. Will be visually recognized.

  Further, when the observation direction is changed in a direction parallel to the plane portion 3 in a state where an acute angle is formed with respect to the plane portion 3 of the anti-counterfeit sheet 1, the character mark 12 constituting the latent image “T” is changed. The color changes according to the viewing direction, and the color of the visible latent image “T” changes.

  When the anti-counterfeit sheet 1 described above is copied, the information printed in the information printing area 4 of the sheet base material 2 and the character mark 12 and the background mark 13 provided by printing on the sheet base material 2 are copied. However, the convex part 11 cannot be reproduced. Therefore, even if the observation direction of the copy is changed, the latent image by the character mark 12 does not appear, and the colors of the character mark 12 and the background mark 13 do not change. Authenticity discrimination can be performed. Thus, when performing authenticity determination, in the anti-counterfeit sheet 1 of the present embodiment, when the observation direction with respect to the anti-counterfeit sheet 1 is changed from the normal direction of the flat portion 3 of the sheet base material 2 to which direction Even so, since the latent image by the character mark 12 appears to appear, it is possible to easily determine whether the latent image is true or false without being limited to the observation direction. Even when the observation direction is changed to a direction parallel to the plane portion 3 in a state where an acute angle is formed with respect to the plane portion 3 of the anti-counterfeit sheet 1, the colors of the character portion mark 12 and the background portion mark 13 are changed. However, the four mark colors 12a to 12d remain unchanged, and it is possible to determine whether the mark is true or false. Moreover, since the convex part 11 is formed by denting the plane part 3 of the sheet | seat base material 2, when the sheet base material 2 is seen from the front and back, or when it touches directly, the convex part 11 is recognized. It becomes difficult and the convex part 11 becomes difficult to reproduce, and the forgery prevention function can be improved.

(Other embodiments)
5A and 5B are diagrams showing an anti-counterfeit sheet as another embodiment of the anti-counterfeit medium of the present invention, wherein FIG. 5A is a diagram showing the entire configuration, and FIG. 5B is an anti-counterfeit shown in FIG. The figure which shows the detailed structure of the structure 110, (c) is a figure which shows the detailed structure which looked at the convex part 111 shown to (b) from the diagonal, (d) is a front view of the convex part 111 shown in (b). It is a figure which shows the detailed structure seen from.

  As shown in FIG. 5A, the forgery prevention sheet 101 in this embodiment is provided with a forgery prevention structure 110 in which a plurality of convex portions 111 are formed in a matrix shape, as shown in FIG. Is configured. As shown in FIG. 5 (c), each of the plurality of convex portions 111 has a shape in which the apex portion is removed from the cone, and includes a side surface 111a and a top portion 111b. It is configured. Further, as shown in FIGS. 5C and 5D, the side surface 111a and the top portion 111b are divided into four regions 114a to 114d in the circumferential direction of the side surface 111a with the center portion of the top portion 111b as the center. The regions 114a to 114d are painted with different mark colors 112a to 112d. That is, information having different mark colors 112a to 112d is displayed in the four regions 114a to 114d into which the convex portion 111 is divided.

  In the anti-counterfeit sheet 101 configured as described above, when the anti-counterfeit sheet 101 is observed from the front, the mark colors 112a to 112d applied to the convex portions 111 are visually recognized at an equal ratio, and the observation direction is set to counterfeit. When changing in a direction that forms an acute angle with respect to the prevention sheet 101, only the region corresponding to the observation direction among the four regions 114 a to 114 d is visually recognized on the side surface 111 a of the convex portion 111. Of the mark colors 112a to 112d applied to the portion 111, the convex portion 111 is visually recognized with a color that is mainly the mark color applied to the region, thereby enabling authenticity determination. Further, when the observation direction is changed in a direction parallel to the anti-counterfeit sheet 101 in a state where the anti-counterfeit sheet 101 is at an acute angle, the color visually recognized according to the observation direction is changed. Authenticity discrimination can be performed.

  In the above-described embodiment, the convex portions 11 and 111 are divided into four regions, and marks are displayed with different mark colors for each of the four regions. Is not limited to four, and it is sufficient that information is displayed with different colors for each of the divided areas.

  In addition, the convex portions 11 and 111 may be of a cylindrical shape, a conical shape without the top portions 11b and 111b, or a dome shape. It is also conceivable that the cross section is rectangular. Further, the sheet base 2 is not limited to being formed by recessing the flat surface portion 3, but may be protruded from the flat surface portion 3 of the sheet base material 2 in the normal direction of the flat surface portion 3. In addition, when the convex part 11 is a cylindrical thing in what was shown in FIG. 1, when the forgery prevention sheet 1 is observed from the front, the character part mark 2 and the background part mark 3 will not be visually recognized.

  In the embodiment described above, the forgery prevention sheet 1, 101 in which the anti-counterfeit structure 10, 110 is provided on the sheet base material 2 made of paper has been described as an example of the forgery prevention medium. Is not limited to such anti-counterfeit sheet 1,101, but also includes a sheet base material made of a film or a card base material made by laminating a plurality of resin layers and provided with anti-counterfeit structures 10, 110 as described above. It is possible to apply.

It is a figure which shows the forgery prevention sheet | seat used as one Embodiment of the forgery prevention medium of this invention, (a) is a figure which shows the whole structure, (b) is a detailed structure of the forgery prevention structure shown to (a). (C) is a cross-sectional view taken along the line AA ′ shown in (b), (d) is a diagram showing a configuration of a convex portion provided with a character mark, and (e) is provided with a background mark. The figure which shows the structure of the convex part, (f) is the figure which looked at the convex part for showing the detailed structure of a character part mark from the front, (g) is the convex part for showing the detailed structure of a background part mark It is the figure which looked at from the front. It is a figure for demonstrating the effect | action at the time of observing the anti-counterfeit sheet | seat shown in FIG. 1 from the front, (a) is the figure seen from the cross-sectional direction, (b) is a character part mark and background part in a forgery prevention structure. It is a figure which shows how a mark looks. It is a figure for demonstrating an effect | action at the time of changing the observation direction with respect to the forgery prevention sheet | seat shown in FIG. 1 from the front, (a) is the case where the observation direction is changed into the B direction in FIG. The figure which shows the appearance of a convex part of FIG. 1, (b) is a figure which shows the appearance of a convex part when changing an observation direction to the C direction in FIG. 1, (c) is an observation direction in FIG. The figure which shows the appearance of a convex part when changing to a direction, (d) is a figure which shows the appearance of a convex part when changing an observation direction to the E direction in FIG. It is a figure for demonstrating an effect | action at the time of changing the observation direction with respect to the forgery prevention sheet 1 shown in FIG. 1 from the front, (a) is the figure seen from the cross-sectional direction, (b) is a background part mark. The figure which shows angle (theta) ₁ of the observation direction with respect to the plane part 3 when it becomes invisible, (c) is a figure which shows the state which looked at the character part mark at angle (theta) ₁ shown in (b), (d) is a figure. The figure which shows the appearance of the character part mark and background part mark when seeing the forgery prevention structure from B direction in 1, (e) is the character part mark and background when seeing the forgery prevention structure from C direction in FIG. The figure which shows the appearance of a part mark, (f) is a figure which shows the appearance of a character part mark and a background part mark at the time of seeing a forgery prevention structure from D direction in FIG. 1, (g) is E direction in FIG. It is a figure which shows the appearance of the character part mark and the background part mark at the time of seeing the forgery prevention structure. It is a figure which shows the forgery prevention sheet | seat which becomes other embodiment of the forgery prevention medium of this invention, (a) is a figure which shows the whole structure, (b) is detailed of the forgery prevention structure shown to (a). The figure which shows a structure, (c) is a figure which shows the detailed structure which looked at the convex part shown in (b) from diagonally, (d) is the detailed structure which looked at the convex part shown in (b) from the front. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Anti-counterfeit sheet | seat 2 Sheet | seat base material 3 Plane part 4 Information printing area 10,110 Anti-counterfeit structure 11,111 Convex part 11a, 111a Side surface 11b, 111b Top part 12 Character part mark 12a-12d, 13a-13d, 112a- 112d, 113a to 113d Mark color 13 Background portion mark 14a to 14d, 114a to 114d Area

Claims (1)

Having a convex portion formed with a side surface on the substrate;
The forgery prevention medium, wherein the side surface includes a plurality of regions divided in a circumferential direction, and information having different colors for each of the plurality of regions is displayed.

Images