Tamper-proof seal

Abstract

To provide a secure tamper-proof seal with an inexpensive and low-cost structure.SOLUTION: A tamper-proof seal 1 of the present disclosure comprises a seal layer 10, a base layer 20, and a gloss layer 30. The seal layer 10 forms a transparent layer having an adhesive applied to its rear surface. The base layer 20 forms a transparent layer laminated on the front surface of the seal layer 10. The gloss layer 30 is laminated on the surface of the base layer 20 and forms a layer in which fine concave-convex patterns are formed by transparent ink. The concave-convex pattern 31 includes a pattern region 33 and a character region 34. In the pattern region 33, a combination of fine concave-convex lines is arranged to form a predetermined regular pattern. In the character region 34, a combination of fine concave-convex lines is arranged to form a predetermined character string. The pattern region 33 and the character region 34 at least partially overlap.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an anti-counterfeiting seal.

Background Art

[0002] Conventionally, anti-counterfeiting media attached to various certificates and the like are known. Patent Document 1 discloses an anti-counterfeiting medium using a hologram structure in which a three-dimensional image is recorded by laser processing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the laser processing for manufacturing the hologram structure has a problem of high processing cost, so it has a lack of versatility.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a secure anti-counterfeiting seal with an inexpensive and low-cost configuration.

Means for Solving the Problems

[0006] The anti-counterfeiting seal of the present disclosure includes a seal layer, a base layer, and a gloss layer. The seal layer forms a transparent layer with an adhesive applied to the back surface. The base layer forms a transparent layer laminated on the surface of the seal layer. The gloss layer is laminated on the surface of the base layer and forms a layer with a fine uneven pattern formed by transparent ink. The uneven pattern includes a pattern area and a character area. In the pattern area, myriad lines formed by fine unevenness are arranged to constitute a predetermined regular pattern. In the character area, myriad lines formed by fine unevenness are arranged to constitute a predetermined character string. At least a part of the pattern area and the character area overlap each other.

Advantages of the Invention

[0007] According to the present disclosure, it is possible to provide an anti-counterfeiting seal that can be realized with a low-cost configuration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

[0010] (1) Outline of the anti-counterfeiting seal 1 The outline of the anti-counterfeiting seal 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing an example of a certificate on which the anti-counterfeiting seal 1 is used. FIG. 2 is a plan view of the certificate shown in FIG. 1.

[0011] As shown in FIG. 1, the anti-counterfeiting seal 1 according to the present embodiment is a seal member attached to various certificates and the like. The anti-counterfeiting seal 1 has a function of proving that the attached certificate is genuine. That is, the anti-counterfeiting seal 1 is attached to the certificate for the purpose of preventing forgery of the certificate. Thereby, by simply attaching the anti-counterfeiting seal 1, it is possible to prevent forgery of official certificates.

[0012] Therefore, when the anti-counterfeiting seal 1 is attached, it is confirmed that the certificate is genuine. The anti-counterfeiting seal 1 is composed of a plurality of transparent layers and has light transmissivity, so that the contents described in the certificate can be confirmed through the anti-counterfeiting seal 1.

[0013] As shown in FIG. 2, for example, the following information is described in the certificate. · Name of the certificate · Identification information of the person to be certified (name, address, personal number, etc.) · Attributes of the person to be certified recognized by the public institution (qualification, disability level, affiliated institution, etc.) · Matters related to the issuance of the certificate (issuing authority, issue date, etc.) Note that the items described in the certificate are arbitrarily changed depending on the type of the certificate.

[0014] The person to be certified presents the certificate at the administrative window, and the following matters are approved by the administrative agency. · The person to be certified does or does not do a predetermined action ·The person to be certified receives the provision of a predetermined article or service Note that the matters approved by possessing the certificate are arbitrarily set according to the type of certificate.

[0015] As shown in FIG. 1, the certificate is delivered from the issuer to the person to be certified with the anti-counterfeiting seal 1 affixed. The anti-counterfeiting seal 1 has restricted circulation and it is difficult for anyone other than the issuer of the certificate to obtain it. For this reason, improper use of the anti-counterfeiting seal 1 is avoided.

[0016] (2) Configuration of the anti-counterfeiting seal 1 Next, the configuration of the anti-counterfeiting seal 1 will be described with reference to FIGS. 3 to 5. FIG. 3 is a plan view of the anti-counterfeiting seal 1 shown in FIG. 1. FIG. 4 is an exploded cross-sectional view taken along the arrow IV-IV of the anti-counterfeiting seal 1 shown in FIG. 3. FIG. 5 is an enlarged view of the symbol V shown in FIG. 3.

[0017] As shown in FIG. 3, a specific character string and a specific pattern are formed on the anti-counterfeiting seal 1. As shown in FIG. 4, the anti-counterfeiting seal 1 includes a seal layer 10, a base layer 20, and a gloss layer 30. The anti-counterfeiting seal 1 is formed by printing the base layer 20 on the surface of the adhesive seal constituting the seal layer 10 and printing the gloss layer 30 on the surface of the base layer 20. The structure of each layer will be described in detail.

[0018] The seal layer 10 is a transparent seal with an adhesive applied to its back surface. The seal layer 10 is made of, for example, a colorless and transparent PET (polyethylene terephthalate) material. The seal layer 10 has light transmissivity. An adhesive is applied to the back surface of the seal layer 10. Note that the seal layer 10 may be colored and transparent. The seal layer 10 is affixed to various certificates issued by public institutions. The thickness of the seal layer 10 is, for example, several tens of μm to several hundreds of μm.

[0019] The underlayer 20 is a transparent layer laminated on the surface of the seal layer 10. The underlayer 20 has a base portion 21 printed with a transparent base ink. The base portion 21 has light transmissivity. An arbitrary character string or pattern is printed on a part of the base portion 21 with a colored ink. The thickness of the underlayer 20 is, for example, several μm to several tens of μm.

[0020] In the illustrated example, the character string "〇× City" indicated by the symbol L is printed at the four corners of the rectangular base portion 21 in plan view (see FIG. 3). The characters or patterns printed on the underlayer 20 are printed with a colored ink.

[0021] The type of the colored ink used for the underlayer 20 is not particularly limited, but ultraviolet curable ink (UV ink) can be used. This is because the curing time can be shortened by irradiating ultraviolet rays after printing the UV ink. Also, in order to sufficiently obtain the glossiness due to the fine lines formed in the gloss layer 30 described later, it is preferable to use an ink having as much luster as possible. Since the gloss layer 30 is formed on the surface of the underlayer 20, it is desirable that the surface of the underlayer 20 be a uniform surface with as few irregularities as possible.

[0022] Thus, at least one of a predetermined character string and a pattern is printed with a colored ink on a part of the underlayer 20. Therefore, by printing specific information on the underlayer 20, the structure of the anti-counterfeiting seal 1 can be made more complex and more secure.

[0023] As shown in FIG. 3, the gloss layer 30 is a colorless and transparent layer laminated on the surface of the underlayer 20. A transparent ink is further printed on the surface of the underlayer 20 in the gloss layer 30. Therefore, the gloss layer 30 has light transmissivity. The transparent ink is printed to have a predetermined thickness such as several tens of μm to several hundreds of μm. In the gloss layer 30, fine lines forming a fine uneven pattern 31 are formed with the transparent ink. The thickness, interval, and depth of the fine lines are, for example, several tens of μm to several hundreds of μm.

[0024] The term "multiple lines" refers to a collection of regularly arranged lines. The multiple lines are formed, for example, by a group of parallel lines. By adjusting the thickness, spacing, and depth of the concavities and convexities of the convex portions 32 that make up the group of parallel lines, the local permeability in the transparent region can be changed, and the degree of gloss can be expressed with shades. A smooth portion where no multiple lines are formed may be formed on a part of the surface of the gloss layer 30.

[0025] In the multiple lines shown in the enlarged view of FIG. 4, the height and width of the convex portions 32 can be arbitrarily set. The transparent ink preferably has high light transmittance. As the transparent ink, a light-colored ink that can visually recognize the patterns and characters printed on the base layer 20 with colored ink may be used. As the transparent ink, similar to the colored ink used for the base layer 20, UV ink may be used and cured by ultraviolet irradiation to shorten the manufacturing time.

[0026] The concavo-convex pattern 31 includes a pattern region 33 and a character region 34. In the pattern region 33, multiple lines formed by fine concavities and convexities are arranged to form a predetermined regular pattern.

[0027] As shown in FIG. 3, in the present embodiment, a grid-like pattern region 33 regularly arranged over the entire surface of the gloss layer 30 is formed. Each of the plurality of pattern regions 33 has the same size and the same shape as each other. Therefore, as a whole of the pattern regions 33, an aesthetic appearance with a unified pattern is produced.

[0028] A group of parallel lines included in one pattern region 33 are oriented in the same direction as each other. In other words, in the gloss layer 30, the pattern region 33 is defined by a group of parallel lines extending in the same direction. That is, in FIG. 3, although a part of the parallel lines included in the pattern region 33 is not shown, actually, inside one pattern region 33 having a rectangular shape, it is occupied by a group of parallel lines extending in the same direction.

[0029] In the text area 34, a predetermined character string is formed by arranging a group of parallel lines formed by fine irregularities. In the present embodiment, a character area 34 indicating the character string "〇×CITY" is formed in a part of the gloss layer 30. The group of parallel lines included in the character area 34 are oriented in the same direction as each other. In other words, in the gloss layer 30, the character area 34 is defined by a group of parallel lines extending in the same direction.

[0030] FIG. 5 is an enlarged view of the symbol V in the anti-counterfeiting seal 1 shown in FIG. 3. As shown in FIG. 5, in the gloss layer 30, the pattern areas 33 adjacent to each other have a group of parallel lines constituting each of them extending in different directions from each other. Thereby, in the gloss layer 30, a delicate pattern can be formed by the parallel lines formed by the fine irregularities.

[0031] Also, in the gloss layer 30, the parallel lines constituting the pattern area 33 extend in a direction different from the parallel lines constituting the character area 34. Thereby, in the gloss layer 30, a delicate character string can be visibly formed by the parallel lines formed by the fine irregularities.

[0032] Also, in each of the plurality of character areas 34, the parallel lines constituting the character area 34 extend in the same direction as each other. For this reason, in adjacent character areas 34, it is easier to recognize that the character string "〇×CITY" is represented by a group of character areas 34. 〇×CITY indicates the issuer of the certificate. Therefore, it can be proved that the issuer of the certificate is genuine by the character area 34 formed on the anti-counterfeiting seal 1.

[0033] And, in the anti-counterfeiting seal 1 of the present embodiment, the pattern area 33 and the character area 34 at least partially overlap. In the example of FIG. 5, the pattern areas 33A to 33D and the character area 34 overlap. That is, the pattern areas 33A to 33D, which are originally rectangular areas, have a shape excluding the character area 34.

[0034] In this way, in the gloss layer 30, a complex pattern composed of a specific design and a specific character string is formed by a transparent ink. This makes it even more difficult to counterfeit, and with an inexpensive and low-cost configuration, the secure anti-counterfeiting seal 1 can be provided.

[0035] Also, on the surface of the gloss layer 30, there is an uneven pattern 31 formed by myriad lines. Therefore, when observing the light that passes through the gloss layer 30 while incident on and reflected by the uneven pattern 31, the gloss changes variously, and a high-class feeling can be expressed.

[0036] And as shown in FIG. 1, in the anti-counterfeiting seal 1, since all the layers are configured to be transparent, a pattern composed of a specific design and character string is formed in the gloss layer 30, which has a gloss feeling, but the content described in the certificate can be sufficiently visually recognized.

[0037] (3) Manufacturing method of the anti-counterfeiting seal 1 Next, the manufacturing method of the anti-counterfeiting seal 1 will be described with reference to FIGS. 6 to 9. FIG. 6 is a schematic diagram showing the manufacturing line 100 of the anti-counterfeiting seal 1 shown in FIG. 1. FIG. 7 is a plan view of the plate 41C used for printing the anti-counterfeiting seal 1 shown in FIG. 1. FIG. 8 is a view showing the base material 2 input into the manufacturing line 100 shown in FIG. 7. It is a flowchart showing the manufacturing method of the anti-counterfeiting seal 1.

[0038] The anti-counterfeiting seal 1 is manufactured by flexographic printing performed a plurality of times. Flexographic printing is a type of relief printing, which is a printing method in which ink is adhered to the convex portion of a plate made of a soft material such as resin and the ink is transferred to the base material 2 to be printed.

[0039] As shown in FIG. 6, the manufacturing line 100 includes a first printing machine 110, a second printing machine 120, a third printing machine 130, a die cutting machine 140, and a plurality of conveying rollers 150. The first printing machine 110, the second printing machine 120, the third printing machine 130, and the die cutting machine 140 are arranged in this order from the previous process to the subsequent process. The plurality of conveying rollers 150 are configured such that the first printing machine 110, the second printing machine 120, the third printing machine 130, and the die cutting machine 140 form a series of manufacturing line 100.

[0040] The first printing machine 110 is a printing machine that prints a transparent base ink as the base portion 21 of the base layer 20 on the surface of the seal layer 10. The second printing machine 120 is a printing machine that prints the character string L with a colored ink on the surface of the base portion 21 of the base layer 20. The third printing machine 130 is a printing machine that prints the gloss layer 30 on the surface of the base layer 20. Since the first printing machine 110 to the third printing machine 130 have a common configuration, the specific configuration will be collectively described below.

[0041] Each of the printing machines 110 to 130 is a flexographic printing machine. Each of the printing machines 110 to 130 includes a plate cylinder 40, an impression cylinder 50, an anilox roll 60, and an ink pan 70. The plate cylinder 40 is a roller member to which a plate 41 is attached. The plate 41 is wound around the outer peripheral surface of the plate cylinder 40.

[0042] As shown in FIG. 7, a pattern and a character string to be printed are formed on the plate 41. The plate 41C shown in FIG. 7 corresponds to the plate 41 used for printing the gloss layer 30. The plate 41 is formed of a resin material or a rubber material. On the surface of the plate 41, unevenness corresponding to the pattern and the character string to be printed is formed in a state reversed from the finished state.

[0043] The plate 41 is manufactured by being formed by laser processing. Thereby, a fine surface shape can be realized, and since no chemicals are used during the manufacture of the plate 41, there is an advantage of low environmental impact.

[0044] The impression cylinder 50 conveys the long base material 2 while pressing it against the plate cylinder 40. Thereby, the ink is transferred onto the surface of the base material 2. By adjusting the pressing force of the impression cylinder 50, the printing state can be adjusted.

[0045] When using UV ink as the ink, after transferring the ink onto the base material 2, it may be irradiated with an ultraviolet lamp. Thereby, the ink cures immediately and can proceed continuously to the next process.

[0046] The ink pan 70 is a container for storing ink. In the ink pan 70, the inks for forming each layer are stored.

[0047] The anilox roll 60 is a roller member that transfers the ink in the ink pan 70 onto the surface of the plate 41. The anilox roll 60 scoops up the ink in the ink pan 70 by adhering the ink to the outer peripheral surface, and transfers the ink onto the plate 41 by contacting the surface of the plate 41. The conveyance roller 150 is a roller member that conveys the long base material 2.

[0048] The die cutter 140 is arranged at the most downstream of the production line 100. The die cutter 140 performs die cutting of the anti-counterfeiting seal 1 from the base material 2 introduced into the production line 100, and removes the backing paper 11 contained in the base material 2. Here, the base material 2 introduced into the production line 100 will be described.

[0049] As shown in FIG. 8, the base material 2 includes an adhesive seal 10 and a backing paper 11. The adhesive seal 10 is a seal member made of, for example, a PET (polyethylene terephthalate) material, and an adhesive is applied to the back surface. The adhesive seal 10 is adhered to the backing paper 11. A base layer 20 is printed on the surface of the adhesive seal 10. That is, the adhesive seal 10 of the base material 2 becomes the seal layer 10 of the anti-counterfeiting seal 1.

[0050] The die-cutting machine 140 performs die-cutting on the substrate 2 on which the gloss layer 30 has been printed. In the die-cutting process, as shown by the dashed line in FIG. 8, a die shape corresponding to the size of the anti-counterfeiting seal 1 is pressed onto the surface of the adhesive seal 10, and a half-cut is performed so as to make a cut in the adhesive seal 10 corresponding to the outer shape of the anti-counterfeiting seal 1.

[0051] The die-cutting machine 140 further performs deburring on the substrate 2 that has been half-cut. Deburring is an operation of removing the frame portion of the adhesive seal 10 that corresponds to the outside of the anti-counterfeiting seal 1. Thereby, a tack seal in which a plurality of anti-counterfeiting seals 1 are arranged can be obtained with respect to the backing paper 11.

[0052] Next, the manufacturing process of the anti-counterfeiting seal 1 will be described. As shown in FIG. 9, in the manufacture of the anti-counterfeiting seal 1, first, a plate 41 is produced (step S101). The production of the plate 41 is performed by laser processing based on the printing images of the base layer 20 and the gloss layer 30. Thereby, the plates 41A to 41C used in the respective printing machines 110 to 130 are produced respectively.

[0053] With the produced plate 41 attached to each of the printing machines 110 to 130, printing of the base layer 20 on the substrate 2 is performed (step S102). In the printing of the base layer 20, first, using the first printing machine 110, printing of the base portion 21 using a transparent base ink is performed on the surface of the adhesive seal 10 on the substrate 2. Thereafter, using the second printing machine 120, printing of a character string or pattern using a colored ink is performed on the surface of the base portion 21.

[0054] After the printing of the base layer 20, printing of the gloss layer 30 is performed (step S103). In the printing of the gloss layer 30, using the third printing machine 130, printing of the uneven pattern 31 using a transparent ink is performed on the surface of the base layer 20.

[0055] After the printing of the gloss layer 30, die cutting is performed (step S104). In die cutting, a cut corresponding to the outer shape of the anti-counterfeiting seal 1 is made by half-pressing the blade die of the die cutting machine 140 against the surface of the base material 2. In the die cutting, deburring is then performed, and a plurality of tack seals with the anti-counterfeiting seals 1 arranged side by side on the backing paper 11 are obtained.

[0056] Thereafter, the tack seal is cut to a predetermined length. This completes the production of the anti-counterfeiting seal 1. When using the anti-counterfeiting seal 1, the anti-counterfeiting seal 1 removed from the tack seal is affixed to various certificates.

[0057] (4) Modification The modification of the present embodiment will be described below.

[0058] In the present embodiment, the base portion 21 of the underlayer 20 is shown to be transparent, but this is not the only case. The base portion 21 of the underlayer 20 may not be transparent. That is, a specific character string or pattern may be printed on the base portion 21 of the underlayer 20 with colored ink. In this case, the underlayer 20 will not have transparency. Therefore, such an anti-counterfeiting seal 1 can be used as a ticket to prove the authenticity of the certificate by being affixed to a part of the certificate without covering the entire certificate.

[0059] Also, in the present embodiment, the anti-counterfeiting seal 1 is shown to include the seal layer 10, the underlayer 20, and the gloss layer 30, but this is not the only case. That is, the anti-counterfeiting seal 1 may include only the seal layer 10 and the gloss layer 30.

[0060] Also, in the present embodiment, an example where the anti-counterfeiting seal 1 is affixed to various certificates is shown, but this is not the only case. The anti-counterfeiting seal 1 may be affixed to various printed materials such as business cards and advertising printed materials for the purpose of imparting a sense of luxury, in addition to valuable printed materials such as gift tickets and admission tickets.

[0061] Further, by combining the directions of the myriad lines formed on the gloss layer 30, the gloss layer 30 may have various shapes. The myriad lines are not limited to straight lines and may be curves.

[0062] Also, in this embodiment, a manufacturing method of manufacturing the anti-counterfeiting seal 1 using flexographic printing has been described, but this is not the only case. As the manufacturing method of the anti-counterfeiting seal 1, various printing methods can be adopted. For example, silk screen printing capable of printing with ink piled up like flexographic printing can be adopted. These printing methods can form a three-dimensional uneven pattern 31 on the gloss layer 30 while ensuring a predetermined thickness for the base layer 20.

[0063] Also, in this embodiment, a configuration in which the seal layer 10 is a transparent seal member with an adhesive applied to the back surface has been shown, but this is not the only case. That is, a special packaging film provided with a film layer instead of the seal layer 10 is also included in the present invention. The special packaging film includes a film layer, a base layer 20, and a gloss layer 30. The configurations of the base layer 20 and the gloss layer 30 are the same as those in the above-described embodiment. The film layer is formed of a transparent film material to which no adhesive is applied. The film layer may be colored and transparent. The thickness of the film layer is, for example, several tens of μm.

[0064] The special packaging film is used, for example, as packaging paper for covering a specific product. Thereby, it can be proved that the product covered with the special packaging film is genuine, and designability can be imparted to the product at the distribution stage.

[0065] For example, as conventional packaging paper, a plain and colorless transparent film material is widely known. Since such a general packaging film is plain and colorless transparent, it has a side of lacking designability. In the special packaging film included in the present invention, since the gloss changes variously due to the uneven pattern of the gloss layer 30, a high-class feeling can be produced for the product at the distribution stage.

[0066] In addition, since the uneven pattern 31 of the gloss layer 30 includes the design area 33 and the character area 34, for example, by printing a specific logo indicating the origin of a product as an uneven pattern in the design area 33 or the character area 34, a product in the distribution stage can be provided with an origin display function. Further, this can prove that the covered product is genuine.

[0067] As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist thereof. In addition, a plurality of components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in a certain embodiment may be added to the components of another embodiment, or some of the components among all the components shown in a certain embodiment may be deleted from the embodiment.

[0068] In addition, the drawings schematically show each component mainly for facilitating the understanding of the invention. Also, the configuration of each component shown in the above embodiments is an example and is not particularly limited. Needless to say, various changes, omissions, and combinations are possible without substantially departing from the effects of the present invention.

[0069] (5) Supplementary Note The invention according to the present disclosure is supplemented as follows.

[0070] (Supplementary Note 1) A transparent seal layer having an adhesive applied to the back surface, A transparent base layer laminated on the surface of the seal layer, A gloss layer laminated on the surface of the base layer and having a fine uneven pattern formed by transparent ink, The uneven pattern includes a pattern area in which ten thousand lines formed by fine unevenness are arranged to form a predetermined regular pattern, and a character area in which ten thousand lines formed by fine unevenness are arranged to form a predetermined character string The pattern area and the character area are at least partially overlapped, anti-counterfeiting seal.

[0071] (Appendix 2) The ten thousand lines constituting the symbol area extend in a direction different from that of the ten thousand lines constituting the character area. The anti-counterfeiting seal according to Appendix 1.

[0072] (Appendix 3) Comprising a plurality of the symbol areas, For the symbol areas adjacent to each other, the ten thousand lines constituting each of them extend in directions different from each other. The anti-counterfeiting seal according to Appendix 1 or 2.

[0073] (Appendix 4) At least one of a predetermined character string and a symbol is printed with a colored ink on a part of the base layer. The anti-counterfeiting seal according to any one of Appendices 1 to 3.

[0074] (Appendix 5) The seal layer is affixed to various certificates issued by public institutions. The anti-counterfeiting seal according to any one of claims 1 to 4.

Industrial Applicability

[0075] The present disclosure is applicable to the field of anti-counterfeiting seals.

Explanation of Signs

[0076] 1: Anti-counterfeiting seal 10: Seal layer 20: Base layer 30: Gloss layer 31: Concavo-convex pattern 32: Convex part 33: Symbol area 34: Character area 40: Plate cylinder 41: Plate 50: Press cylinder 60: Anilox roll 70: Ink pan

Claims

1. A transparent seal layer with adhesive on the back side; A transparent base layer laminated on the surface of the sealing layer; a glossy layer on the surface of the base layer, on which a fine uneven pattern is formed using transparent ink; Equipped with The uneven pattern includes a pattern area in which lines formed by fine unevenness are arranged to form a predetermined regular pattern, and a character area in which lines formed by fine unevenness are arranged to form a predetermined character string. The design area and the character area at least partially overlap each other in this anti-counterfeiting seal.

2. 2. The counterfeit prevention seal according to claim 1, wherein the lines constituting the design area extend in a different direction from the lines constituting the character area.

3. A plurality of the design areas are provided, 3. The counterfeit prevention seal according to claim 1, wherein the lines constituting the adjacent pattern areas extend in different directions.

4. 3. The counterfeit prevention seal according to claim 1, wherein at least one of a predetermined character string and a predetermined design is printed on a part of the base layer using colored ink.

5. The counterfeit prevention seal according to claim 4, wherein the seal layer is attached to various certificates issued by public institutions.

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