JP2008290300A - Antifalsification medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve securability in an antifalsification structure employing latent image therein. <P>SOLUTION: The antifalsification structure of this antifalsification medium has a colored background region 12 and a plurality of mark parts 11, each of which has the color different from that of the colored background region 12 and is provided in a matrix form on the colored background region 12 on a sheet base material 2. In each region among regions, the latent images to be formed therein of which are different from one another, of the colored background region 12, a plurality of convexities 13 each having convex surfaces rising from some arcs on different directional sides from each other towards the center of a circular annular shape from the outer periphery of the circular annular shape with the colored background region 12 at its center are formed, while, in the remaining region, a plurality of convexities 13 each having convex surfaces rising from some arcs of the same directional sides as the latent image-forming convexities towards the center of the circular annular shape from the outer periphery of the circular annular shape with a center having the same as that of the mark part 11 are formed. <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 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, 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 emerges with the printed line and the relief line, it corresponds to the shape of the relief line when observed from a direction perpendicular to the printed line and the relief line. Since only one latent image emerges, it is difficult to say that the security is high.

  The present invention has been made in view of the problems of the conventional techniques as described above, and an object thereof is to provide a forgery prevention medium having high security.

In order to achieve the above object, the present invention provides:
A background color region provided on the substrate surface;
A plurality of mark portions provided in a matrix having a color different from the background color region on the background color region;
A row and / or a column is formed in the first region of the background color region in parallel with the arrangement direction of the plurality of mark portions, and the first of the annular outer periphery centering on the background color region A plurality of first convex portions including a convex surface rising from a partial arc on the direction side toward the center of the annular shape, the convex surface including the background region;
An annular shape that forms a row and / or a column in parallel with the arrangement direction of the plurality of first protrusions in an area other than the first area in the background color area, and has the same center as the mark part A plurality of second convex portions each having a convex surface that rises from a partial arc on the first direction side toward the center of the annular shape,
A row and / or a column is formed in the second region of the background color region in parallel with the arrangement direction of the plurality of mark portions, and the first of the annular outer periphery centering on the background color region. A plurality of third convex portions including a convex surface rising from a part of the arc on the second direction side different from the direction toward the center of the annular shape, and including the background region on the convex surface;
An annular shape that forms a row and / or a column in parallel with the arrangement direction of the plurality of third convex portions in an area other than the second area in the background color area, and has the same center as the mark part A plurality of fourth convex portions having convex surfaces rising from a part of the arc on the second direction side toward the center of the annular shape.

  In the present invention configured as described above, when the substrate is observed from the front, the substrate is provided with a row and / or column configured in a color different from the background color region on the background color region of the substrate surface. A plurality of mark portions are recognized. A plurality of first to fourth convex portions are respectively formed on the base material, but when the base material is observed from the front, the top side to the bottom side in the convex shape of the first to fourth convex portions Therefore, only the plurality of mark portions constituting the rows and / or columns are recognized, and the latent image does not appear to appear. When the observation direction is changed from this state to a first direction that forms an acute angle with respect to the substrate surface, the first and second convex portions each have an annular shape centered on the background color region or the mark portion. The convex surface of the first and second convex portions is opposed to the observation direction because it has a convex surface that rises from a part of the arc on the first direction side toward the center of the annular shape. The colors of the convex surfaces of the first and second convex portions are easy to see by the reflection of light. The convex surface of the first convex portion includes the background color region, and the convex surface of the second convex portion is the center of the annular shape from a partial arc of the annular shape having the same center as the mark portion. The first convex portion and the second convex portion are caused by the difference in contrast between the convex surface of the first convex portion and the convex surface of the second convex portion. Can be identified, and the latent image formed by the first convex portion or the second convex portion appears to appear. Further, when the observation direction is changed to the second direction that forms an acute angle with respect to the substrate surface, the third and fourth convex portions each have an annular shape centered on the background color region or the mark portion. Since the outer surface has a convex surface that rises from a partial arc on the second direction side toward the center of the annular shape, the surfaces of the third and fourth convex portions face the observation direction, The colors of the convex surfaces of the third and fourth convex portions are easy to see due to the reflection of light. The convex surface of the third convex portion includes a background color region, and the convex surface of the fourth convex portion is the center of the annular shape from a partial arc of the annular shape having the same center as the mark portion. Since the mark portion is included because it rises toward the surface, the third convex portion and the fourth convex portion are caused by the difference in contrast between the convex surface of the third convex portion and the convex surface of the fourth convex portion. Can be identified, and the latent image formed by the third or fourth protrusions appears to appear.

  As described above, a plurality of first to fourth protrusions formed on the base material when the observation direction is changed in the first direction relative to the base material surface and when the observation direction is changed in the second direction. The convex part whose convex surface is opposite to the observation direction of the part changes, and accordingly, the latent image by the first convex part or the second convex part and the third convex part or the fourth convex part depend on the observation direction. Different latent images emerge from the latent image of the part.

  As described above, in the present invention, the plurality of first and second convex portions for expressing the latent image are in the first direction out of the annular outer periphery centered on the background color region or the mark portion. A convex surface rising from a partial arc on the side toward the center of the toric shape, and a plurality of third and fourth convex portions for expressing a latent image form a background color region or a mark portion. Since the outer periphery of the annular shape as the center has a convex surface that rises from a part of the arc on the second direction side different from the first direction toward the center of the annular shape, the observation direction is the base material The convex surface of the plurality of first to fourth convex portions formed on the substrate is opposed to the observation direction when the surface is changed in the first direction and the second direction with respect to the surface. Depending on the direction of observation, the first convex portion or the second convex portion changes. A latent image by parts, results in a different look latent image emerged in the latent image by the third convex portion or the fourth convex portions, thereby improving the security.

  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 an arrangement of mark portions constituting the anti-counterfeit 10, (c) is a diagram showing an arrangement of the convex portions 13 constituting the anti-counterfeit structure 10 shown in (a), and FIGS. It is a perspective view which shows an example of the convex part 13 shown.

  As shown in FIG. 1A, the forgery prevention sheet 1 of this 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 that becomes the surface of the base material, and 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 has a background on a background color region 12 made of the same white color as the base color of the flat surface 3 of the sheet base 2. A plurality of mark portions 11 made of black different from the color region 12 are provided. The plurality of mark portions 11 are arranged in rows and columns on the background color region 12 to form a matrix.

  In the region where the plurality of mark portions 11 are provided in a matrix, a dome-shaped convex portion formed by depression of the sheet base material 2 from the flat portion 3 side by about 0.05 to 0.1 mm with an embossed plate or the like. 13 is formed. As shown in FIG. 1 (c), the convex portion 13 is composed of a combination of four convex portions 13 made of an arc of a quarter circle. When the convex portion 13 is composed of one convex portion 13, FIG. As shown in d), the shape is formed by a quarter arc of the outer circumference of the dome shape, and when it is formed of four convex portions 13, it is in the shape of one dome as shown in FIG. The shape of this convex part 13 changes with the arrangement positions. And it becomes the 1st-8th convex part by the arrangement position and direction. The anti-counterfeit structure 10 illustrated in the present embodiment has 400 mark portions 11 formed in a 20 × 20 matrix 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.

  2A and 2B are diagrams showing the arrangement of a part of the convex portions constituting the forgery prevention structure 10 shown in FIG. 1, wherein FIG. 2A is a diagram showing the entire arrangement, and FIG. 2B is a diagram shown in FIG. The figure which shows the one convex part 13b, (c) is a figure which shows the one convex part 13a shown to (a).

  Of the convex portions 13 constituting the anti-counterfeit structure 10 shown in FIG. 1, the first convex portion 13a is hidden by the arrangement shape of the plurality of convex portions 13a as shown in FIGS. 2 (a) and 2 (c). The rows and columns are formed in parallel with the arrangement direction of the plurality of mark portions 11 so as to express the letter “T” as an image, and are formed in the first region of the background color region 12. From the arc on the A side in FIG. 1 (c), which is the first direction of the outer circumference of the circle centered on the background color region 12 surrounded by the four mark portions 11, toward the center of the circle. The convex surface includes a mark portion 11 and a background color region 12.

  Further, as shown in FIGS. 2A and 2B, the second convex portion 13 b includes a plurality of mark portions 11 so as to surround a region where the plurality of convex portions 13 a are formed in the background color region 12. Are formed in parallel with the arrangement direction of each of the above, and each of them is formed in the first direction among the outer circumferences of the circles having the same center as that of the mark portion 11 in FIG. The convex surface rises from the arc of ¼ toward the center of the circle, and only the mark portion 11 is included in the convex surface.

  3A and 3B are diagrams showing an arrangement of a part of the convex portions constituting the forgery prevention structure 10 shown in FIG. 1, wherein FIG. 3A is a diagram showing the entire arrangement, and FIG. 3B is a diagram shown in FIG. The figure which shows the one convex part 13d, (c) is a figure which shows the one convex part 13c shown to (a).

  Of the convex portions 13 constituting the anti-counterfeit structure 10 shown in FIG. 1, the third convex portion 13a is hidden by the arrangement shape of the plurality of convex portions 13c, as shown in FIGS. The rows and columns are formed in parallel with the arrangement direction of the plurality of mark portions 11 so as to express the letter “P” as an image, and are formed in the second region of the background color region 12. From the arc on the B side in FIG. 1 (c), which is the second direction of the outer circumference of the circle centered on the background color region 12 surrounded by the four mark portions 11, toward the center of the circle. The convex surface includes a mark portion 11 and a background color region 12.

  Further, as shown in FIGS. 3A and 3B, the fourth convex portion 13 d has a plurality of mark portions 11 so as to surround a region where the plurality of convex portions 13 c are formed in the background color region 12. Are arranged in rows and columns in parallel with the arrangement direction, and each of them is a second side of the outer periphery of a circle having the same center as that of the mark portion 11 and is in the second direction in FIG. The convex surface rises from the arc of ¼ toward the center of the circle, and only the mark portion 11 is included in the convex surface.

  4A and 4B are diagrams showing an arrangement of a part of the convex portions constituting the forgery prevention structure 10 shown in FIG. 1, wherein FIG. 4A shows the entire arrangement, and FIG. 4B shows the arrangement shown in FIG. The figure which shows the one convex part 13f, (c) is a figure which shows the one convex part 13e shown to (a).

  Among the convex portions 13 constituting the forgery prevention structure 10 shown in FIG. 1, the fifth convex portion 13e is latent depending on the arrangement shape of the plurality of convex portions 13e as shown in FIGS. 4 (a) and 4 (c). A row and a column are formed in parallel with the arrangement direction of the plurality of mark portions 11 so as to express the letter “F” as an image, and each is formed in the third region of the background color region 12. Of the outer periphery of the circle centered on the background color region 12 surrounded by the four mark portions 11, a convex surface rises from the ¼ arc on the C side in FIG. 1C toward the center of the circle. The convex surface includes a mark portion 11 and a background color region 12.

  Further, as shown in FIGS. 4A and 4B, the sixth convex portion 13f includes a plurality of mark portions 11 so as to surround a region where the plurality of convex portions 13e are formed in the background color region 12. Are formed in parallel with the arrangement direction of each of the above, and each of them is formed by forming a quarter arc on the C side in FIG. To the center of the circle, and the convex surface includes only the mark portion 11.

  FIG. 5 is a diagram showing an arrangement of some convex portions constituting the forgery prevention structure 10 shown in FIG. 1, (a) is a diagram showing the entire arrangement, and (b) is shown in (a). The figure which shows the one convex part 13h, (c) is a figure which shows the one convex part 13g shown to (a).

  Among the convex portions 13 constituting the anti-counterfeit structure 10 shown in FIG. 1, the seventh convex portion 13g is hidden by the arrangement shape of the plurality of convex portions 13e as shown in FIGS. A row and a column are formed in parallel with the arrangement direction of the plurality of mark portions 11 so as to express the character “S” as an image, and are formed in the fourth region of the background color region 12. Of the outer circumference of the circle centered on the background color region 12 surrounded by the four mark portions 11, a convex surface rises from the ¼ arc on the D side in FIG. 1C toward the center of the circle. The convex surface includes a mark portion 11 and a background color region 12.

  Further, as shown in FIGS. 5A and 5B, the eighth convex portion 13 h includes a plurality of mark portions 11 so as to surround a region where the plurality of convex portions 13 g are formed in the background color region 12. Are formed in parallel with the arrangement direction of each of the circles, and each of them is formed by ¼ arc on the D side in FIG. To the center of the circle, and the convex surface includes only the mark portion 11.

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

  First, 400 mark portions 11 are printed in black in a 20 × 20 matrix shape in an area where the anti-counterfeit structure 10 of the sheet base material 2 is provided, that is, an area to be a white background color area 12. The mark portion 11 may be printed simultaneously with the pre-printing as described above or after the pre-printing described above.

  Next, the convex part 13 is formed by pressing the embossed plate from the flat part 3 side of the sheet base material 2 to the area where the mark part 11 is printed. By this embossed plate, the convex portion 13a is formed between the four mark portions 11 in the first region that forms “T” that becomes a latent image in the region where the mark portion 11 is printed, and the convex portion 13b. Is formed on the mark portion 11 in a region other than the first region in the mark portion 11. Further, the convex portion 13c is formed between the four mark portions 11 in the second region that forms “P” as a latent image in the region where the mark portion 11 is printed. The portion 11 is formed on the mark portion 11 in a region other than the second region. Further, the convex portion 13e is formed between the four mark portions 11 in the third region that forms “F” that is a latent image in the region where the mark portion 11 is printed, and the convex portion 13f The portion 11 is formed on the mark portion 11 in a region other than the third region. The convex portion 13g is formed between the four mark portions 11 in the fourth region that forms “S” as a latent image in the region where the mark portion 11 is printed, and the convex portion 13h The portion 11 is formed on the mark portion 11 in a region other than the fourth region.

  Thereby, as shown in FIG.1 (c), the convex part 13 formed on the sheet | seat base material 2 consists of one which has one dome-shaped 1/4 convex part by the arrangement position, or several There will be a combination of convex parts of the two.

  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.

  FIG. 6 is a diagram for explaining the operation when the anti-counterfeit sheet 1 shown in FIGS. 1 to 5 is observed from the front, and shows how the anti-counterfeit structure 10 is seen.

  When the anti-counterfeit sheet 1 shown in FIG. 1 to FIG. 5 is observed from the front, that is, from the normal direction of the plane portion 3, the background color region 12 is white in the anti-counterfeit structure 10 as shown in FIG. 6. On the other hand, since the plurality of mark portions 11 provided in a matrix in the background color region 12 are black, the plurality of mark portions 11 in the matrix shape are recognized. At this time, a plurality of convex portions 13 are formed on the sheet base material 2. When the anti-counterfeit sheet 1 is observed from the front, the convex portions 13 are observed from the top side toward the bottom side. Therefore, the convex portion 13 is difficult to be recognized, the plurality of mark portions 11 are only recognized in a matrix shape, and the latent images “T”, “P”, “F”, and “S” appear to rise. Not come.

  Next, an effect | action at the time of changing the observation direction with respect to the forgery prevention sheet 1 shown in FIGS. 1-5 from the front, ie, the normal line direction of the plane part 3 of the sheet | seat base material 2, is demonstrated.

  FIG. 7 is a diagram for explaining the operation when the observation direction for the forgery prevention sheet 1 shown in FIGS. 1 to 5 is changed from the front. FIG. FIGS. 4B to 4E are views showing how the forgery prevention structure 10 is seen.

  When the observation direction with respect to the anti-counterfeit sheet 1 shown in FIGS. 1 to 5 is changed from the front, the angle formed by the observation direction with respect to the flat portion 3 of the sheet base 2 becomes an acute angle, and the convex portion 13 Among them, there is a convex portion whose convex surface is opposed to the observation direction. As shown in FIG. 7A, light from the observation direction is reflected as it is in the observation direction and the amount of reflected light received in the observation direction increases at the convex part whose convex surface faces the observation direction. Thereby, the color of the convex surface of the convex portion can be clearly seen.

  Here, when the observation direction for the anti-counterfeit sheet 1 shown in FIGS. 1 to 5 is changed from the front to the A side in FIG. 1 (a), among the convex portions 13 formed on the sheet base material 2, The convex portions 13a and 13b have convex surfaces that rise from the ¼ arc on the A side in FIG. 1A toward the center of the circle in the outer circumference of the circle centered on the background color region 12 or the mark portion 11. Therefore, the convex surfaces of the convex portions 13a and 13b are opposed to the observation direction. As shown in FIG. 2C, the convex portion 13a includes the mark portion 11 and the background color region 12 on the convex surface, and the convex portion 13b, as shown in FIG. Since only the mark portion 11 is included in the convex surface, the convex portion 13a and the convex portion 13b can be identified by the difference in contrast between the convex surface of the convex portion 13a and the convex surface of the convex portion 13b. As a result, as shown in FIG. 7B, in the black region formed by the convex portion 13b, the latent image “T” formed by the convex portion 13a appears to appear in a lighter color than black.

  Moreover, if the observation direction with respect to the forgery prevention sheet 1 shown in FIGS. 1 to 5 is changed from the front to the B side in FIG. The portions 13c and 13d have a convex surface that rises from the ¼ arc on the B side in FIG. 1A toward the center of the circle in the outer circumference of the circle centered on the background color region 12 or the mark portion 11. The convex surfaces of the convex portions 13c and 13d face the observation direction. As shown in FIG. 3C, the convex portion 13c includes the mark portion 11 and the background color region 12 on the convex surface, and the convex portion 13d is formed as shown in FIG. Since only the mark portion 11 is included in the convex surface, the convex portion 13c and the convex portion 13d can be identified by the difference in contrast between the convex surface of the convex portion 13c and the convex surface of the convex portion 13d. As a result, as shown in FIG. 7C, in the black region formed by the convex portion 13d, the latent image “P” by the convex portion 13c appears to appear as a lighter color than black.

  Moreover, when the observation direction with respect to the anti-counterfeit sheet 1 shown in FIGS. 1 to 5 is changed from the front to the C side in FIG. The portions 13e and 13f have a convex surface that rises from the ¼ arc on the C side in FIG. 1A toward the center of the circle in the outer periphery of the circle centering on the background color region 12 or the mark portion 11. The convex surfaces of the convex portions 13e and 13f are opposed to the observation direction. As shown in FIG. 4C, the convex portion 13e includes the mark portion 11 and the background color region 12 on the convex surface, and the convex portion 13f is formed as shown in FIG. Since only the mark portion 11 is included in the convex surface, the convex portion 13e and the convex portion 13f can be distinguished by the difference in contrast between the convex surface of the convex portion 13e and the convex surface of the convex portion 13f. As a result, as shown in FIG. 7D, the latent image “F” by the convex portion 13e appears to appear in a lighter color than black in the black region by the convex portion 13f.

  Moreover, when the observation direction with respect to the anti-counterfeit sheet 1 shown in FIGS. 1 to 5 is changed from the front to the D side in FIG. The portions 13g and 13h have a convex surface that rises from the ¼ arc on the D side in FIG. 1A toward the center of the circle in the outer circumference of the circle centered on the background color region 12 or the mark portion 11. The convex surfaces of the convex portions 13g and 13h are opposed to the observation direction. As shown in FIG. 5C, the convex portion 13g includes the mark portion 11 and the background color region 12, and the convex portion 13h is formed as shown in FIG. Since only the mark portion 11 is included in the convex surface, the convex portion 13g and the convex portion 13h can be identified by the difference in contrast between the convex surface of the convex portion 13g and the convex surface of the convex portion 13h. As a result, as shown in FIG. 7E, in the black region formed by the convex portion 13h, the latent image “S” by the convex portion 13g appears to appear in a lighter color than black.

  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 mark portions 11 provided in a matrix by printing on the sheet base material 2 are copied. The projection 13 cannot be reproduced. For this reason, even when the observation direction of the copy is changed, the latent image formed by the plurality of convex portions 13 does not appear, and it is possible to perform authenticity determination. Thus, when performing authenticity determination, in the anti-counterfeit sheet 1 of the present embodiment, the observation direction with respect to the anti-counterfeit sheet 1 is changed to the respective directions A to D in FIG. The latent images that emerge from and appear different from each other, thereby improving the security. Moreover, since the convex part 13 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 13 is recognized. This makes it difficult for the convex portion 13 to be reproduced, thereby improving the forgery prevention function.

  Note that the information to be a latent image is not limited to the above-described “T”, “P”, “F”, “S”, and the like. The part 13 may be configured only by rows or only by columns. Moreover, it is not limited to one consisting of a single character, but may be one consisting of a plurality of characters or a pattern. It is also conceivable to divide the plurality of convex portions 13 representing the latent image into a plurality of regions and to make characters and the like appear in each of the plurality of regions.

  In addition, in the above-described embodiment, the background color region 12 and the mark portion 11 are colored with the background color region 12 being white and the mark portion 11 being black. The portion 11 may be white and is not limited to white or black as long as the colors are different from each other.

  In this embodiment, the convex portions 13a, 13c, 13e, and 13g representing the latent images “T”, “P”, “F”, and “S” define the background color region 12 between the four mark portions 11. Convex portions 13b, 13d, 13f, and 13h are formed so as to have a convex surface that rises from a quarter arc on a predetermined direction side of the outer periphery of the circle as a center toward the center of the circle, In the outer circumference of a circle having the same center as that of the mark portion 11, the example has a convex surface rising from a quarter arc on the predetermined direction side toward the center of the circle, but the convex portion 13a, 13c, 13e, and 13g are predetermined in the outer periphery of a circle having the same center as that of the mark portion 11 in the region expressing the latent images “T”, “P”, “F”, and “S”. Standing up from the ¼ arc on the direction side toward the center of the circle In a region surrounding the convex portions 13b, 13d, 13f, and 13h surrounding the convex portions 13b, 13d, 13f, and 13h, 1 / It may have a convex surface rising from the arc of 4 toward the center of the circle.

  Further, in the present embodiment, the convex portion 13 has a convex surface that rises from the ¼ arc on the predetermined direction side toward the center of the circle on the outer periphery of the circle centering on the background color region 12 or the mark portion 11. The convex portion in the present invention may be a polygonal shape or an elliptical shape, and in the present invention including a polygonal shape or an elliptical shape, Define.

  Further, in the present embodiment, the convex portion 13 rises from a partial arc in any one of the four directions of the outer circumference of the circle centering on the background color region 12 or the mark portion 11 toward the center of the circle. However, the number of directions is not limited to four as long as it is two or more, and the convex surface is directed from the arc in which the ring shape is divided into the number toward the center of the circle. It will stand up.

  In this embodiment, the anti-counterfeit sheet 1 in which the anti-counterfeit structure 10 is provided on the sheet base material 2 made of paper has been described as an example of the anti-counterfeit medium. The present invention is not limited to 1, but can be applied to a sheet base material made of a film or a card base material in which a plurality of resin layers are laminated and provided with the forgery prevention structure 10 as described above.

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 mark which comprises the forgery prevention structure shown to (a) The figure which shows the arrangement | sequence of a part, (c) is a figure which shows the arrangement | sequence of the convex part which comprises the forgery prevention structure shown in (a), (d), (e) is an example of the convex part shown in (c). It is a perspective view shown. It is a figure which shows the arrangement | sequence of the one part convex part which comprises the forgery prevention structure shown in FIG. 1, (a) is a figure which shows the whole arrangement | sequence, (b), (c) is 1 shown in (a). It is a figure which shows two convex parts. It is a figure which shows the arrangement | sequence of the one part convex part which comprises the forgery prevention structure shown in FIG. 1, (a) is a figure which shows the whole arrangement | sequence, (b), (c) is 1 shown in (a). It is a figure which shows two convex parts. It is a figure which shows the arrangement | sequence of the one part convex part which comprises the forgery prevention structure shown in FIG. 1, (a) is a figure which shows the whole arrangement | sequence, (b), (c) is 1 shown in (a). It is a figure which shows two convex parts. It is a figure which shows the arrangement | sequence of the one part convex part which comprises the forgery prevention structure shown in FIG. 1, (a) is a figure which shows the whole arrangement | sequence, (b), (c) is 1 shown in (a). It is a figure which shows two convex parts. It is a figure for demonstrating an effect | action at the time of observing the forgery prevention sheet | seat shown in FIGS. 1-5 from the front. 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 FIGS. 1-5 from the front, (a) is a figure for demonstrating reflection of the light in a convex part. (B)-(e) is a figure which shows the appearance of the forgery prevention structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-counterfeit sheet | seat 2 Sheet | seat base material 3 Plane part 4 Information printing area 10 Anti-counterfeit structure 11 Mark part 12 Background color area 13, 13a-13h Convex part

Claims (1)

A background color region provided on the substrate surface;
A plurality of mark portions provided in a matrix having a color different from the background color region on the background color region;
A row and / or a column is formed in the first region of the background color region in parallel with the arrangement direction of the plurality of mark portions, and the first of the annular outer periphery centering on the background color region A plurality of first convex portions including a convex surface rising from a partial arc on the direction side toward the center of the annular shape, the convex surface including the background region;
An annular shape that forms a row and / or a column in parallel with the arrangement direction of the plurality of first protrusions in an area other than the first area in the background color area, and has the same center as the mark part A plurality of second convex portions each having a convex surface that rises from a partial arc on the first direction side toward the center of the annular shape,
A row and / or a column is formed in the second region of the background color region in parallel with the arrangement direction of the plurality of mark portions, and the first of the annular outer periphery centering on the background color region. A plurality of third convex portions including a convex surface rising from a part of the arc on the second direction side different from the direction toward the center of the annular shape, and including the background region on the convex surface;
An annular shape that forms a row and / or a column in parallel with the arrangement direction of the plurality of third convex portions in an area other than the second area in the background color area, and has the same center as the mark part An anti-counterfeit medium having a plurality of fourth convex portions each having a convex surface rising from a partial arc on the second direction side toward the center of the annular shape.

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