JP4832192B2 - Anti-counterfeit media - Google Patents

Description

  The present invention relates to an anti-counterfeit medium such as an anti-counterfeit sheet, and more particularly to an anti-counterfeit structure using a latent image.

  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, when the copy is made, the print information including the printed line printed on the surface is copied, but the raised shape of the relief line is not included. It cannot be reproduced. 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 based on 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 a forgery prevention medium that can easily perform authenticity determination by a latent image without being limited to an observation direction. The purpose is to provide.

In order to achieve the above object, the present invention provides:
A plurality of convex portions formed to protrude in the normal direction of the planar portion on the base material having the planar portion,
For each of the plurality of convex portions, a plurality of first mark portions provided on the planar portion so as to surround the convex portion,
And a second mark portion provided over the entire circumference of the side surface of the predetermined convex portion among the plurality of convex portions.

  In the present invention configured as described above, when observed from the normal direction of the planar portion of the substrate, the planar portion provided with the first mark portion is opposed to the observation direction. Is reflected in the observation direction on the first mark portion provided on the plane portion, and the first mark portion can be clearly seen. On the other hand, since the side surface of the convex portion provided with the second mark portion does not face the observation direction, the light from the observation direction is observed on the second mark portion provided on the side surface of the convex portion. In other directions, the light is reflected and dispersed, and the second mark portion can be seen only thinly. Therefore, when observed from the normal direction of the planar portion of the base material, only the first mark portion provided around the convex portion where the second mark portion is not provided among the plurality of convex portions. Even in a convex portion that is visually recognized and provided with a second mark portion on the side surface among the plurality of convex portions, the second mark portion can only be seen thin, whereas the first mark portion can be clearly seen. Only the first mark portion is visually recognized by the illusion. Moreover, when the observation direction with respect to the base material is changed from the normal direction of the flat portion of the base material from this state, the observation direction comes to face the side surface of the convex portion provided with the second mark portion. To go. Then, the light from the observation direction is reflected in the observation direction on the second mark portion provided on the side surface of the convex portion, so that the second mark portion can be clearly seen. On the other hand, since the plane portion provided with the first mark portion does not face the observation direction, light from the observation direction is also emitted in directions other than the observation direction on the first mark portion provided on the plane portion. The light is reflected and dispersed, so that the first mark portion can be seen only thinly. Therefore, if the plurality of second mark portions are provided on a predetermined convex portion among the plurality of convex portions so that the predetermined information as a latent image is expressed, the observation direction with respect to the base material is set to the base material. When changing from the normal direction of the plane portion, the latent image by the second mark portion appears to appear. Here, in this invention, since the 2nd mark part is provided over the perimeter of the side surface of a convex part, in what direction the observation direction with respect to a base material is from the normal line direction of the plane part of a base material. Even if it is changed, the latent image by the second mark portion appears to appear.

  In addition, when the plurality of convex portions are close to each other, when the observation direction with respect to the base material is changed from the normal direction of the flat surface portion of the base material, the first mark portion provided on the flat surface portion becomes The convex portion surrounded by the first mark portion is hidden by the convex portion adjacent to the observation direction side, and only the latent image by the second mark portion is easily visible.

  As described above, in the present invention, the second mark portion constituting the latent image that emerges when the observation direction is tilted from the normal direction of the planar portion of the substrate is a convex formed on the substrate. Since it is provided over the entire circumference of the side surface of the part, the latent image emerges without being restricted in the observation direction, and authenticity determination by the latent image can be easily performed.

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

(First embodiment)
FIG. 1 is a diagram showing an anti-counterfeit sheet as a first embodiment of the anti-counterfeit medium of the present invention, (a) is a diagram showing the entire configuration, and (b) is a forgery shown in (a). The figure which shows the detailed structure of the prevention structure 10, (c) is AA 'sectional drawing shown in (b), (d) is a figure which shows the structure of the convex part 11 in which the inner mark 13 was provided, (e) ) Is a diagram showing a configuration of the convex portion 11 where the inner mark 13 is not provided.

  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 material 2 includes a plurality of convex portions 11 formed in a matrix on the sheet base material 2 and around the plurality of convex portions 11. A plurality of outer peripheral marks 12 that are first mark portions provided respectively, and an inner mark 13 that is a second mark portion provided only on a predetermined convex portion 11 among the plurality of convex portions 11. Has been. As shown in FIG. 1 (c), the convex portion 11 has a shape in which the apex portion is removed from the cone, protrudes about 0.1 mm in the normal direction of the flat portion 3 of the sheet base 2, and the flat portion 3 Is a circular shape having a diameter of 0.5 mm or less. As the distance from the boundary portion increases, the cross-sectional area gradually decreases. As shown in FIGS. 1D and 1E, the opposite side of the boundary portion is a top portion 11b parallel to the plane portion 3. Therefore, the side surface 11 a of the convex portion 11 faces an oblique direction with respect to the normal line of the plane portion 3. The outer peripheral mark 12 is provided by printing on the flat surface portion 3 of the sheet base material 2 so as to surround the convex portion 11, and the boundary portion between the convex portion 11 and the flat surface portion 3 is circular. It has become. The inner mark 13 is provided by printing over the entire circumference of the side surface 11a of the predetermined convex portion 11 among the plurality of convex portions 11, and the boundary portion between the convex portion 11 and the flat surface portion 3 is circular. In addition, since the cross-sectional area of the convex portion 11 gradually decreases as the distance from the boundary portion increases, the circular shape is obtained when viewed from the normal direction of the flat surface portion 3 of the sheet base material 2. The anti-counterfeit structure 10 illustrated in the present embodiment uses ten convex portions 11 and outer peripheral marks 12 each in vertical and horizontal directions for the sake of simplicity of explanation, but the number thereof should be increased. As a result, the character that becomes a latent image that can be lifted by the forgery prevention structure 10 can be made finer, and a curve or the like can be easily expressed.

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

  FIG. 2 is a diagram for explaining a manufacturing method of the forgery prevention sheet 1 shown in FIG. 1, and shows only a region of the sheet base material 2 where the forgery prevention structure 10 is provided.

  First, the outer periphery mark 12 and the inner mark 13 are each printed in a circular shape in a region where the anti-counterfeit structure 10 of the sheet substrate 2 is provided (FIG. 2A). The outer periphery mark 12 is printed in a 10 × 10 matrix, and the inner mark 13 is printed along the outer periphery mark 12 in the outer periphery mark 12 that is a position where “T” is formed among the 100 outer periphery marks 12. To do. The combination of the outer peripheral mark 12 and the inner mark 13 is set in advance according to a 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 outer peripheral mark 12 and the inner mark 13 may be performed simultaneously with the pre-printing as described above or after the pre-printing described above.

  Next, a plurality of convex portions 11 are formed using an embossed plate in a region where the outer peripheral mark 12 and the inner mark 13 are printed (FIG. 2B). The convex portion 11 is formed inside the 100 outer peripheral marks 12 and the portion provided with the inner mark 13 so that the outer side of the inner mark 13 becomes a boundary portion with the plane portion 3, thereby The outer peripheral mark 12 surrounds the convex portion 11, and the inner mark 13 has a shape provided over the entire circumference of the side surface of the convex portion 11.

  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.

  3A and 3B are diagrams for explaining the operation when the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front. FIG. 3A is a diagram illustrating light reflection in the anti-counterfeit structure 10, and FIG. FIG. 4A is a diagram illustrating how the outer peripheral mark 12 and the inner mark 13 are seen by reflection of light, and FIG. 5C is a diagram illustrating how the outer peripheral mark 12 and the inner mark 13 are viewed in the forgery prevention structure 10.

  When the anti-counterfeit sheet 1 shown in FIG. 1 is observed from the front, the plane portion 3 of the sheet base 2 is opposed to the observation direction. Therefore, in the region that becomes the plane portion 3, light from the observation direction is in the observation direction. Reflected as it is, the amount of received light in the observation direction of the reflected light increases. Of the outer periphery mark 12 and the inner mark 13 provided in the forgery prevention structure 10, the outer periphery mark 12 is provided in a region to be the flat portion 3 of the sheet base material 2, and therefore, is shown by a one-dot chain line in FIG. As shown, the light from the observation direction is reflected in the observation direction on the outer periphery mark 12, so that the outer periphery mark 12 can be clearly seen as shown in FIG.

  On the other hand, in the side surface 11a of the convex part 11 formed on the sheet base material 2, when the anti-counterfeit sheet 1 is observed from the front, the light from the observation direction is in the observation direction because it is not opposed to the observation direction. The amount of received light in the observation direction of the reflected light is reduced by reflecting in other directions. Of the outer periphery mark 12 and the inner mark 13 provided in the forgery prevention structure 10, the inner mark 13 is provided on the side surface 11 a of the convex portion 11, and therefore, from the observation direction as shown by the broken line in FIG. Is reflected and dispersed on the inner mark 13 in directions other than the observation direction, so that the inner mark 13 can be seen only thinly as shown in FIG.

  Therefore, when the anti-counterfeit sheet 1 is observed from the front, as shown in FIG. 3 (c), among the plurality of protrusions 11, the protrusions 11 where the inner mark 13 is not provided are provided around the periphery. Only the outer circumference mark 12 is visually recognized, and the outer circumference mark 12 can be clearly seen in the convex portion 11 in which the inner mark 13 is provided on the side surface 11a among the plurality of convex portions 11 while the inner mark 13 is only seen thin. Due to this illusion, almost only the outer peripheral mark 12 is 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 normal direction of the flat portion 3 of the sheet base material 2 will be described.

  FIG. 4 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) shows the reflection of light in the anti-counterfeit structure 10. FIGS. 4B and 5B are views showing how the outer periphery mark 12 and the inner mark 13 are seen by the reflection of light shown in FIG. 5A, and FIGS. 5C to 5F are the outer periphery mark 12 and the inner mark 13 in the forgery prevention structure 10. It is a figure which shows how to see.

  When the observation direction with respect to the forgery prevention sheet 1 shown in FIG. 1 is changed from the front, the observation direction approaches a direction facing the side surface 11 a of the convex portion 11 formed on the sheet substrate 2. Then, on the side surface 11a of the convex portion 11, the light from the observation direction is reflected as it is in the observation direction, and the amount of received light in the observation direction of the reflected light increases. Of the outer periphery mark 12 and the inner mark 13 provided in the forgery prevention structure 10, the inner mark 13 is provided on the side surface 11 a of the convex portion 11 formed on the sheet substrate 2. As indicated by the alternate long and short dash line, light from the observation direction is reflected on the inner mark 13 in the observation direction, so that the inner mark 13 can be clearly seen as shown in FIG.

  On the other hand, since the planar portion 3 of the sheet base material 2 does not face the observation direction, light from the observation direction is reflected in directions other than the observation direction, and the amount of received light in the observation direction of the reflected light is reduced. Of the outer periphery mark 12 and the inner mark 13 provided in the forgery prevention structure 10, the outer periphery mark 12 is provided on the flat surface portion 3 of the sheet base material 2, so that it is observed as indicated by a broken line in FIG. The light from the direction is reflected and dispersed on the outer peripheral mark 12 in the direction other than the observation direction, and as a result, the outer peripheral mark 12 can be seen only thinly as shown in FIG.

  Therefore, if the observation direction with respect to the anti-counterfeit sheet 1 is changed to the lower side in FIG. 1, for example, as shown in FIG. 4C, the latent image formed by the inner mark 13 provided on the anti-counterfeit structure 10 “T” appears to appear. At this time, when the convex portion 11 is formed in the vicinity, or when the observation direction with respect to the forgery prevention sheet 1 is greatly changed from the normal direction of the sheet base material 2, the outer peripheral mark 12 provided on the flat surface portion 3. However, it is hidden by the protrusion 11 adjacent to the observation direction side of the protrusion 11 surrounded by the outer peripheral mark 12 and becomes invisible, and the latent image by the inner mark 13 is easily visible.

  Here, in the anti-counterfeit sheet 1 shown in FIG. 1, the inner mark 13 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. Therefore, even when the observation direction is changed from the normal direction of the flat surface portion 3 of the sheet base material 2 to any direction, the latent image by the inner mark 13 appears to appear. . For example, when the observation direction with respect to the anti-counterfeit sheet 1 is changed to the upper side in FIG. 1, the latent image “T” formed by the inner mark 13 appears to appear as shown in FIG. When the observation direction with respect to the anti-counterfeit sheet 1 is changed to the right side in FIG. 1, the latent image “T” formed by the inner mark 13 appears to emerge as shown in FIG. When the observation direction with respect to the anti-counterfeit sheet 1 is changed to the left side in FIG. 1, the latent image “T” constituted by the inner mark 13 emerges as shown in FIG. It becomes visible.

  When the anti-counterfeit sheet 1 is copied, the information printed in the information printing area 4 of the sheet base 2 and the outer peripheral mark 12 and the inner mark 13 provided by printing on the sheet base 2 are copied. The convex part 11 cannot be reproduced. For this reason, even if the observation direction of the copy is changed, the latent image by the inner mark 13 does not appear, thereby making it possible to determine authenticity. 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 inner mark 13 appears to appear, it is possible to easily determine the authenticity of the latent image without being limited to the observation direction.

  It should be noted that the outer peripheral mark 12 and the inner mark 13 provided in the forgery prevention structure 10 are not uniform in width as in the present embodiment, and may have a shape protruding partly in the width direction. Further, the inner mark 13 may be configured such that the inside of the illustrated inner mark 13 is all colored. However, in that case, in order to make it difficult to visually recognize the inner mark 13 when the anti-counterfeit sheet 1 is observed from the front, the formation angle of the convex portion 11 with respect to the flat portion 3 needs to be steep.

  Further, the convex portion 11 may be conical or dome-shaped without the top portion 11b. In the case of the dome shape, a region that is not substantially parallel to the flat surface portion 3 of the convex portion is defined as a side surface, and the inner mark 13 is provided in that region.

(Second Embodiment)
FIG. 5 is a diagram showing an anti-counterfeit sheet that is a second embodiment of the anti-counterfeit medium of the present invention, (a) is a diagram showing the overall configuration, and (b) is a forgery shown in (a). The figure which shows the detailed structure of the prevention structure 110, (c) is AA 'sectional drawing shown in (b), (d) is a figure which shows the structure of the convex part 111 in which the inner mark 113 was provided, (e) ) Is a diagram showing a configuration of the convex portion 111 where the inner mark 113 is not provided.

  As shown in FIG. 5, the anti-counterfeit sheet 1 of this embodiment is configured by providing a forgery prevention structure 110 in a partial region of a sheet base material 102 made of paper. The sheet base material 102 has a flat portion 103, an information printing region 104 is provided in a partial region of the flat portion 103, and a forgery prevention structure 110 is provided in another region. The anti-counterfeit sheet 101 configured as described above can be used as an entrance ticket for a concert or the like, for example, similar to the one shown in the first embodiment. In this case, the contents of the concert, the venue name, the seat number, etc. are printed in the information printing area 104. In addition, before the information is printed in the information printing area 104 of the sheet base material 102, it may be possible to print a tint block or precolor the sheet base material 102 as a pre-print. In this case, it is necessary to prevent the latent image from the forgery prevention structure 110 from being difficult to see.

  As shown in FIG. 5B, the forgery prevention structure 110 provided on the sheet base material 102 includes a plurality of convex portions 111 formed in a matrix on the sheet base material 102, and around the plurality of convex portions 111. A plurality of outer peripheral marks 112 that are first mark portions provided respectively, and an inner mark 113 that is a second mark portion provided only on a predetermined convex portion 111 among the plurality of convex portions 111. Has been. As shown in FIG. 5C, the convex portion 111 has a shape obtained by removing the apex portion from the quadrangular pyramid, and protrudes about 0.1 mm in the normal direction of the flat portion 103 of the sheet base material 102. The boundary part with 103 has a rectangular shape with a side of 0.5 mm or less. As the distance from the boundary portion increases, the cross-sectional area gradually decreases. As shown in FIGS. 5D and 5E, the opposite side of the boundary portion is a top portion 111 b parallel to the plane portion 103. Therefore, the convex portion 111 has four side surfaces 111 a, and each of the four side surfaces 111 a faces an oblique direction with respect to the normal line of the plane portion 103. The outer peripheral mark 112 is provided by printing on the flat surface portion 103 of the sheet base material 102 so as to surround the convex portion 111 by a broken line, and the boundary portion between the convex portion 111 and the flat surface portion 103 is a rectangular shape. It has a rectangular shape. The inner mark 113 is formed of a broken line like the outer peripheral mark 112, and is provided by printing over the entire circumference of the four side surfaces 111 a of the predetermined convex portion 111 among the plurality of convex portions 111. Since the boundary portion with the flat surface portion 103 has a rectangular shape, and the cross-sectional area of the convex portion 111 gradually decreases as the distance from the boundary portion increases, the normal direction of the flat surface portion 103 of the sheet base material 102 When viewed from above, the shape is rectangular.

  In the anti-counterfeit sheet 101 configured as described above, first, the outer peripheral mark 112 and the inner mark 113 are printed on the sheet base material 102, and then the convex portion, as shown in the first embodiment. It is manufactured by forming 111.

  Below, the effect | action of the forgery prevention sheet 101 mentioned above is demonstrated.

  First, an operation when the forgery prevention sheet 101 shown in FIG. 5 is observed from the front surface, that is, the normal direction of the flat portion 103 of the sheet base material 102 will be described.

  6A and 6B are diagrams for explaining the operation when the anti-counterfeit sheet 101 shown in FIG. 5 is observed from the front. FIG. 6A is a diagram showing light reflection in the anti-counterfeit structure 110, and FIG. FIG. 8A is a diagram showing how the outer periphery mark 112 and the inner mark 113 are seen by the reflection of light shown in FIG.

  When the anti-counterfeit sheet 101 shown in FIG. 5 is observed from the front, since the flat portion 103 of the sheet base material 102 faces the observation direction, light from the observation direction is in the observation direction in the region that becomes the flat portion 103. Reflected as it is, the amount of received light in the observation direction of the reflected light increases. Among the outer periphery mark 112 and the inner mark 113 provided in the forgery prevention structure 110, the outer periphery mark 112 is provided in a region to be the flat portion 103 of the sheet base material 102, and therefore, is indicated by a one-dot chain line in FIG. As shown, the light from the observation direction is reflected on the outer periphery mark 112 in the observation direction, so that the outer periphery mark 112 can be clearly seen as shown in FIG.

  On the other hand, in the side surface 111a of the convex portion 111 formed on the sheet base material 102, when the anti-counterfeit sheet 101 is observed from the front, the light from the observation direction is in the observation direction because it is not opposed to the observation direction. The amount of received light in the observation direction of the reflected light is reduced by reflecting in other directions. Of the outer periphery mark 112 and the inner mark 113 provided on the forgery prevention structure 110, the inner mark 113 is provided on the side surface 111a of the convex portion 111, and therefore, from the observation direction as shown by the broken line in FIG. Is reflected and dispersed in the direction other than the observation direction on the inner mark 113, so that the inner mark 113 can be seen only thinly as shown in FIG. 6B.

  Therefore, when the anti-counterfeit sheet 101 is observed from the front, as shown in FIG. 6 (c), among the plurality of protrusions 111, the protrusions 111 where the inner mark 113 is not provided are provided around the periphery. Only the outer peripheral mark 113 is visible, and the inner mark 113 can be seen only thinly in the convex part 111 in which the inner mark 113 is provided on the side surface 111a among the plurality of convex parts 111, but the outer peripheral mark 112 is clearly visible. Due to this illusion, almost only the outer peripheral mark 112 is visible.

  Next, an operation when the observation direction with respect to the anti-counterfeit sheet 101 illustrated in FIG. 5 is changed from the front, that is, the normal direction of the flat portion 103 of the sheet base material 102 will be described.

  FIG. 7 is a diagram for explaining the operation when the observation direction with respect to the forgery prevention sheet 101 shown in FIG. 5 is changed from the front, and (a) shows the reflection of light in the forgery prevention structure 110. FIGS. 4B and 4B are views showing how the outer periphery mark 112 and the inner mark 113 are seen by the reflection of light shown in FIG. 5A, and FIGS. It is a figure which shows how to see.

  When the observation direction with respect to the forgery prevention sheet 101 illustrated in FIG. 5 is changed from the front, the observation direction approaches a direction facing the side surface 111 a of the convex portion 111 formed on the sheet base material 102. Then, on the side surface 111a of the convex portion 111, light from the observation direction is reflected as it is in the observation direction, and the amount of received light in the observation direction of the reflected light increases. Of the outer periphery mark 112 and the inner mark 113 provided on the forgery prevention structure 110, the inner mark 113 is provided on the side surface 111a of the convex portion 111 formed on the sheet base material 102, and therefore, as shown in FIG. As shown by the alternate long and short dash line, light from the observation direction is reflected on the inner mark 113 in the observation direction, so that the inner mark 113 can be clearly seen as shown in FIG.

  On the other hand, since the flat portion 103 of the sheet base material 102 does not face the observation direction, light from the observation direction is reflected in directions other than the observation direction, and the amount of received light in the observation direction of the reflected light is reduced. Of the outer periphery mark 112 and the inner mark 113 provided on the forgery prevention structure 110, the outer periphery mark 112 is provided on the flat surface portion 103 of the sheet base material 102, so that it is observed as indicated by a broken line in FIG. The light from the direction is reflected and dispersed on the outer periphery mark 112 in the direction other than the observation direction, and as a result, the outer periphery mark 112 can be seen only as thin as shown in FIG.

  Therefore, if the observation direction with respect to the forgery prevention sheet 101 is changed to the lower side in FIG. 5, for example, as shown in FIG. 7C, the latent image formed by the inner mark 113 provided in the forgery prevention structure 110 “T” appears to appear. At this time, when the convex portion 111 is formed in the vicinity, or when the observation direction with respect to the forgery prevention sheet 101 is greatly changed from the normal direction of the sheet base material 102, the outer peripheral mark 112 provided on the flat surface portion 103. However, the projection 111 adjacent to the observation direction side of the projection 111 surrounded by the outer peripheral mark 112 is hidden and cannot be seen, and the latent image formed by the inner mark 113 is easily visible.

  Here, in the anti-counterfeit sheet 101 shown in FIG. 5, the inner marks 113 constituting the latent image that emerges depending on the observation direction are formed on the entire circumference of the four side surfaces 111 a of the convex portion 111 formed on the sheet base material 102. Since the observation direction is changed in any direction from the normal direction of the flat portion 103 of the sheet base material 102, the latent image formed by the inner mark 113 appears to appear. become. For example, when the observation direction with respect to the anti-counterfeit sheet 101 is changed to the upper side in FIG. 5, the latent image “T” formed by the inner mark 113 appears to emerge as shown in FIG. When the observation direction with respect to the forgery prevention sheet 101 is changed to the right side in FIG. 5, the latent image “T” formed by the inner mark 113 appears to emerge as shown in FIG. When the observation direction with respect to the anti-counterfeit sheet 101 is changed to the left side in FIG. 5, the latent image “T” constituted by the inner mark 113 emerges as shown in FIG. It becomes visible.

  When the anti-counterfeit sheet 101 described above is copied, the information printed in the information printing area 104 of the sheet base material 102 and the outer periphery mark 112 and the inner mark 113 provided by printing on the sheet base material 102 are copied. The convex portion 111 cannot be reproduced. For this reason, even if the observation direction of the copy is changed, the latent image formed by the inner mark 113 does not appear, and thus it is possible to determine authenticity. When performing the authenticity determination in this way, in the forgery prevention sheet 101 of the present embodiment, when the observation direction with respect to the forgery prevention sheet 101 is changed from the normal direction of the flat portion 103 of the sheet base material 102 to which direction Even so, since the latent image by the inner mark 113 appears to emerge, it is possible to easily determine the authenticity of the latent image without being limited to the observation direction.

  In addition, as the formation angle of the projections 11 and 111 with respect to the flat portions 3 and 103 shown in the two embodiments described above is closer to 90 degrees, when the anti-counterfeit sheet 1 and 101 is viewed from the front, the latent Although it is possible to make it difficult to see the inner marks 13 and 113 constituting the image, on the other hand, when the observation direction is inclined from the normal direction of the plane portions 3 and 103, the observation direction is the side surface of the convex portions 11 and 111. Since the inner marks 13 and 113 forming the latent image are hidden by the projections 11 and 111 adjacent to the observation direction before facing the 11a and 111a, the above-described effects cannot be obtained. It is preferable to set appropriately considering the line width of 113 and the reflectance of the sheet base material 2, 102.

  Moreover, about the protrusion height from the plane parts 3 and 103 of the convex parts 11 and 111, and the dimension of the boundary part with the plane parts 3 and 103, not only what was mentioned above but can be set suitably.

  Further, the present invention may be configured by combining the above-described two embodiments. That is, as shown in the first embodiment, in the forgery prevention sheet in which the convex portion having a circular shape at the boundary portion with the flat portion is formed, the outer peripheral mark and the inner mark are made circular in a broken line. In the anti-counterfeit sheet in which the convex portion having a rectangular shape at the boundary with the flat portion is formed as shown in the second embodiment, the outer peripheral mark and the inner mark are each in a continuous rectangular shape. It is possible to do. However, the distance from the center is substantially constant such that the boundary between the convex part and the flat part is circular, and the distance from the center is substantially constant as the inner mark is also circular. In this case, the shape of the inner mark that can be viewed from the same direction is the same, and the fine shape of the latent image that emerges from the inner mark can be made uniform.

  In the above-described two embodiments, the forgery prevention sheet 1, 101 in which the forgery prevention structure 10, 110 is provided on the sheet base material 2, 102 made of paper is described as an example of the forgery prevention medium. However, the present invention is not limited to the anti-counterfeit sheet 1,101, but the anti-counterfeit structure 10, 110 as described above is provided on a sheet base material made of a film or a card base material made by laminating a plurality of resin layers. It is also possible to apply it to other things.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the forgery prevention sheet | seat used as 1st Embodiment of the forgery prevention medium of this invention, (a) is a figure which shows the whole structure, (b) is the detail 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 the configuration of the convex portion provided with the inner mark, and (e) is provided with the inner mark. It is a figure which shows the structure of the convex part which is not. It is a figure for demonstrating the manufacturing method of the forgery prevention sheet | seat shown in FIG. 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 a figure which shows reflection of the light in a forgery prevention structure, (b) was shown to (a). The figure which shows the appearance of the outer periphery mark and inner mark by reflection of light, (c) is a figure which shows the appearance of the outer periphery mark and the inner mark in the forgery prevention structure. It is a figure for demonstrating the effect | action at the time of changing the observation direction with respect to the forgery prevention sheet shown in FIG. 1 from the front, (a) is a figure which shows reflection of the light in a forgery prevention structure, (b) is The figure which shows how the outer periphery mark and inner mark look by reflection of the light shown to (a), (c)-(f) is a figure which shows the appearance of the outer periphery mark and inner mark in a forgery prevention structure. It is a figure which shows the forgery prevention sheet | seat used as 2nd Embodiment of the forgery prevention medium of this invention, (a) is a figure which shows the whole structure, (b) is the detail 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 the configuration of the convex portion provided with the inner mark, and (e) is provided with the inner mark. It is a figure which shows the structure of the convex part which is not. It is a figure for demonstrating the effect | action at the time of observing the forgery prevention sheet | seat shown in FIG. 5 from the front, (a) is a figure which shows reflection of the light in a forgery prevention structure, (b) was shown to (a). The figure which shows the appearance of the outer periphery mark and inner mark by reflection of light, (c) is a figure which shows the appearance of the outer periphery mark and the inner mark in the forgery prevention structure. It is a figure for demonstrating the effect | action at the time of changing the observation direction with respect to the forgery prevention sheet shown in FIG. 5 from the front, (a) is a figure which shows reflection of the light in a forgery prevention structure, (b) is The figure which shows how the outer periphery mark and inner mark look by reflection of the light shown to (a), (c)-(f) is a figure which shows the appearance of the outer periphery mark and inner mark in a forgery prevention structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Anti-counterfeit sheet 2,102 Sheet base material 3,103 Plane part 4,104 Information printing area 10,110 Anti-counterfeit structure 11,111 Convex part 11a, 111a Side surface 11b, 111b Top part 12,112 Peripheral mark 13,113 Inner mark

Claims (1)

A plurality of convex portions formed to protrude in the normal direction of the planar portion on the base material having the planar portion,
For each of the plurality of convex portions, a plurality of first mark portions provided on the planar portion so as to surround the convex portion,
An anti-counterfeit medium having a second mark portion provided over the entire circumference of a side surface of a predetermined convex portion among the plurality of convex portions.

Images