JP2008265248A - Forgery-proof medium and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery-proof medium which can be applied to articles of value such as a bank note, a passport, valuable securities, stamps, a commodity tag, coupon tickets for toll road etc. and various kinds of tickets. <P>SOLUTION: This forgery-proof medium has a part of a base material to which an optically changing element with a light reflective layer is imparted, a region, without the optically changing element, where a first image is formed, and a region, with the optically changing element, where a second image is formed. The first image is formed by a plurality of perforations opened through the base material or blind perforations, in the region to which the optically changing element is not imparted. On the other hand, the second image is formed by a plurality of light transmitting pixels which are void of an optically reflecting base material for the light reflecting layer of the optically changing element. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anti-counterfeit medium that can be applied to valuables such as banknotes, passports, securities, stamps, product tags, toll roads, and various valuable tickets, and a method for producing the same.

  Anti-counterfeiting technology is applied to valuable items such as banknotes, passports, securities, stamps, product tags, toll roads, and other valuables to guarantee and maintain their value. Therefore, the authenticity of such valuables is determined by attaching an optical change element to the surface of the base material. A thread or a hologram made of an optically changing element is one of anti-counterfeit elements that are particularly effective from the viewpoint of copy prevention and copy prevention, and has been applied to many valuable items.

  As a technique in which a hologram is used, for example, an anti-counterfeit label in which a hologram transfer foil layer is attached and formed on the surface of a base material is disclosed (for example, see Patent Document 1).

In addition, as a technique for imparting information to the metal vapor deposition layer of the hologram, it is a label material comprising at least a transparent plastic film substrate, a diffraction grating pattern, a metal vapor deposition layer and an adhesive layer, and the unique information obtained by melting the metal vapor deposition layer It is a forgery-proof label material having a printing pattern as follows, and the metal vapor-deposited layer is melted in a non-contact manner by irradiation with a laser beam such as YAG or CO ₂ from the transparent plastic film substrate surface, An anti-counterfeit label material characterized by having a printed pattern is disclosed (for example, see Patent Document 2).

  In addition, as a technique combining holograms and printing, there is disclosed a hologram-attached securities characterized in that in a securities provided with holograms, a different pattern is engraved on each leaf like a split between the hologram and paper. (For example, see Patent Document 3).

  In addition, as a technology combining a hologram and a fine hole, a valuable printed matter composed of a base material and a sheet of optically variable elements attached to one surface of the base material, In the range including the attached part, a hole is formed through the laser beam, and the sheet is provided with specific information on both sides, and the sheet information is on the surface side to which the sheet is attached. It can also be confirmed from the back side through the hole formed through the base material, and when trying to peel off the sheet, the base material is broken and restored due to the formation of many fine holes A valuable printed matter characterized by having a configuration that makes it difficult is disclosed (for example, see Patent Document 4).

  Further, in the anti-counterfeit medium in which the optical change element is applied to a part of the base material, a boundary between the area where the optical change element is applied to a part of the base material and the area where the optical change element is not applied is formed. An anti-counterfeit medium is disclosed in which a split image is formed by a group of fine perforations so as to be sandwiched (see, for example, Patent Document 5).

JP 61-182580 A (1st page, Fig. 1-4) JP-A-10-333574 (page 1-4, FIGS. 1 and 2) JP 2000-355183 A (page 1-3, FIGS. 1 and 2) Japanese Patent No. 3336378 (pages 1-6, FIGS. 5 and 6) Japanese Patent Laying-Open No. 2006-205673 (page 1-7, FIG. 1-13)

  However, in recent years, it has become possible for anyone to know the principle of holograms and the like, and holograms that are so reproducible that they cannot be discerned at first glance have been forged and duplicated. In addition, the hologram may be peeled off and altered. Therefore, forgery or tampering can be easily performed only by attaching a hologram to a substrate as in Patent Document 1. Since the unique information of Patent Document 2 cannot be easily counterfeited, the anti-counterfeiting effect is excellent, but there is a possibility that the information is cleanly peeled off from the substrate and altered. For this reason, as disclosed in Patent Document 3, a technique is disclosed in which a picture is engraved between the hologram and the base material, and the act of peeling off the hologram and preventing tampering is disclosed. However, the picture was observed with reflected light. It was something that could be confirmed. Patent Document 4 is a matter of forming a perforation in a hologram, but there is no description about the form of the tally. In Patent Document 5, the perforations are formed in the hologram in the form of split marks. However, since the perforated groups of mark marks can be formed by the same method in the area where the hologram is applied and the area where the hologram is not applied, it is copied. There was an easy problem.

  The present invention is intended to solve the above-described problems, and a different image can be confirmed between reflected light and transmitted light, a region where no optical change element is provided, and an optical change element is provided. It is difficult to produce an image formed in the same area by the same method, and proposes an anti-counterfeit medium excellent in anti-duplication or authenticity discrimination effect and its production method.

  In the present invention, an optical change element having a light-reflective layer is provided on a part of a base material, and a first image is formed in a region where the optical change element is not provided. The second image is formed in the region where the optical change element is not provided, and the first image is formed in the region not provided with the optically changing element by a plurality of perforations penetrating or not penetrating the substrate. The anti-counterfeit medium is formed of a plurality of light-transmitting pixels from which the light-reflective substrate of the light-reflective layer of the static change element is removed. Note that the first image and the second image are arranged adjacent to each other or close to each other, and one image (pattern) is formed by the two images.

  Further, the anti-counterfeit medium of the present invention is provided with an optical change element having a light-reflective layer and a region not provided with the optical change element and an optical change element provided on a part of the substrate. An image is formed in the region, and the image is composed of a first pixel and a second pixel, and the first pixel is formed by a plurality of perforations penetrating or not penetrating the base material in the region where the optical change element is not provided. The formed second pixel is an anti-counterfeit medium characterized by being formed of a plurality of light-transmitting pixels from which the light-reflecting substrate of the light-reflecting layer of the optical change element is removed.

  The anti-counterfeit medium according to the present invention is an anti-counterfeit medium characterized in that the shape of the perforated and light transmissive pixels is at least one of a circle, an ellipse, a square, a polygon, and a special shape.

  The anti-counterfeit medium of the present invention is an anti-counterfeit medium characterized in that the diameter of the perforated and light transmissive pixels is 40 to 1000 μm.

  In the present invention, an optical change element having a light-reflective layer is provided on a part of the base material, and the first is applied to a region where the optical change element is not provided and a region where the optical change element is provided. In the method for producing an anti-counterfeit medium on which an image composed of the first pixel and the second pixel is formed, means for applying an optically changing element to a part of the base material, and the first mechanical method penetrates the base material. Or means for forming the first pixel by a plurality of non-penetrating perforations and a plurality of light-reflective substrates of the light-reflective layer of the optically variable element removed by a chemical method or a second mechanical method. A method for manufacturing a forgery prevention medium, characterized in that it is manufactured by means for forming a second pixel by a light-transmitting pixel.

In addition, in the method for producing a forgery prevention medium of the present invention, the first mechanical method is characterized in that a plurality of perforations penetrating or not penetrating the substrate are formed by a CO ₂ laser or a perforating needle.

In the method for producing a forgery prevention medium of the present invention, the second mechanical method is characterized in that the light reflective substrate of the light reflective layer is removed by a YVO ₄ or YAG laser.

  In addition, the method for producing an anti-counterfeit medium of the present invention is characterized in that the light reflecting substrate of the light reflecting layer is removed by a chemical method using a solvent.

  The anti-counterfeit medium of the present invention forms a meaningful image by an image formed in a region not provided with the optical change element and a region provided with the optical change element. Different images can be confirmed with transmitted light, and since it plays an indicia role, even if the OVD is peeled off and tampered with, there is no perforated image on one side, so a meaningful image cannot be formed, The discrimination can be easily performed.

  In the anti-counterfeit medium of the present invention, it is difficult to produce an image formed in an area not provided with an optical change element and an area provided with an optical change element by the same method. Excellent effect.

  The anti-counterfeit medium according to the present invention is difficult to discriminate authenticity because the optical change element is not provided when the optical change element is peeled off in the course of distribution. Since a part of the image is formed in a region to which no is given, it is possible to determine whether the image is true or false.

  In addition, the diffraction effect of the optically variable element is not impaired by forming individual diameters of the light transmissive pixels at about 40 to 120 μm.

  From the above, since the anti-counterfeit medium of the present invention is excellent in anti-duplication and authenticity discrimination effects, banknotes, passports, securities, stamps, product tags, toll road tickets, cards, various tickets, etc. Can be applied to valuables.

  The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

(Forgery prevention medium)
FIG. 1 shows a forgery prevention medium A1 and a sectional view thereof. As shown in FIG. 1, an optical change element 2 having a light reflective layer is applied to a part of the surface of a substrate 1, and a region to which the optical change element 2 is applied and an optical change element 2 are applied. An image 3 is formed including a region that has not been processed. Since the image 3 is formed including a region to which the optical change element 2 is applied and a region to which the optical change element 2 is not applied, the image 3 is in the form of a tally. In FIG. 1, the image 3 has a rectangular design.

  The image 3 includes a first pixel 3a and a second pixel 3b. The first pixel 3 a is formed by a plurality of perforations 4 penetrating the base material 1 in a region where the optical change element 2 is not provided. As shown in FIG. 2, the second pixel 3 b is a light-reflective substrate in the light-reflective layer 5 of the optical change element 2 including the protective layer 7, the diffraction grating pattern 8, the light-reflective layer 5, and the adhesive layer 9. Are formed by a plurality of light-transmissive pixels 6 from which is removed. The optical change element 2 used in the present invention is not limited to the above-described configuration, and an aluminum foil or a hologram having a diffraction grating on the aluminum foil can be used. Therefore, it is sufficient to have at least the light reflective layer 5. The light reflective layer 5 can be formed of aluminum, gold, silver, tin, bismuth, nickel, lead, or the like. Further, the shape of the optical change element is not particularly limited, such as a special shape such as a circle, an ellipse, a polygon, and a star, a thread shape, or a window-open thread shape. Therefore, it can be read by at least one sensor such as reflected light, transmitted light, and magnetism.

  FIG. 3A shows a case where the anti-counterfeit medium A1 is observed with reflected light. The anti-counterfeit medium A1 is a diagram illustrating a case where the diameter of the perforations 4 is about 80 to 1000 μm and the diameter of the light transmissive pixels 6 is about 40 to less than 120 μm. As shown to Fig.3 (a), since the several perforation which penetrates the base material 1 which is the 1st pixel 3a is formed at 80-1000 micrometers, it can confirm with the naked eye. Since the second pixel 3b is formed by a plurality of light-transmitting pixels 6 of about 40 to less than 120 μm from which the light-reflective layer 5 has been removed, the second pixel 3b is affected by the reflected light of the light-reflective layer 5 with the naked eye. It becomes difficult to confirm. Therefore, only the first pixel 3a can be confirmed.

  FIG. 3B shows a case where the anti-counterfeit medium A1 is observed with transmitted light. As shown in FIG. 3B, since the plurality of perforations 4 penetrating the base material 1 that is the first pixel 3a are formed with 80 to 1000 μm, the transmitted light from the perforations 4 is visually confirmed. be able to. Since the transmitted light amount of the plurality of light transmissive pixels 6 as the second pixels 3b is larger than the transmitted light amount of the light reflective layer 5, a contrast is generated. Therefore, the image 3 composed of the first pixel 3a and the second pixel 3b can be confirmed.

(Modification 1)
FIG. 4A shows a case where the anti-counterfeit medium A2 is observed with reflected light. The anti-counterfeit medium A2 is a diagram showing a case where the diameter of the perforations 4 is about 40 to less than 80 μm and the diameter of the light transmissive pixels 6 is about 120 to 1000 μm. As shown to Fig.4 (a), since the several perforation 4 which penetrates the base material 1 which is the 1st pixel 3a is formed in less than 40-80 micrometers, it will be in the state which is hard to confirm with the naked eye. Since the second pixel 3b is formed by a plurality of light transmissive pixels 6 of about 120 to 1000 μm from which the light reflective layer 5 has been removed, the second pixel 3b is not easily affected by the reflected light of the light reflective layer 5, and is not visible to the naked eye. Can be confirmed. Therefore, only the second pixel 3b can be confirmed.

  FIG. 4B shows a case where the anti-counterfeit medium A2 is observed with transmitted light. As shown in FIG. 4B, the plurality of perforations 4 penetrating through the base material 1 as the first pixel 3a are formed with 40 to 80 μm, but transmitted light is obtained from the fine perforations and is visually observed. Can be confirmed. Since the transmitted light amount of the plurality of light transmissive pixels 6 as the second pixels 3b is larger than the transmitted light amount of the light reflective layer 5, a contrast is generated. Therefore, the image 3 composed of the first pixel 3a and the second pixel 3b can be confirmed.

  Further, by appropriately selecting the diameter of the perforation of the first pixel 3a and the diameter of the light transmissive pixel 6 of the second pixel 3b, the first pixel 3a and the second pixel can be obtained when observed with reflected light. 3b is not confirmed together, and when observed with transmitted light, the image 3 composed of the first pixel 3a and the second pixel 3b can be confirmed, or when observed with reflected light or transmitted light, A configuration in which both the first pixel 3a and the second pixel 3b can be confirmed can be manufactured.

(Modification 2)
The present invention is not limited to the anti-counterfeit medium A1 or the anti-counterfeit medium A2 illustrated in FIG. 1, and a plurality of perforations 4 that are the first pixels 3a, as in the anti-counterfeit medium A3 illustrated in FIG. 5, Non-penetrating, that is, it does not have to penetrate through the substrate 1. In this case, when observed with reflected light, it becomes difficult to confirm with the naked eye than the diameter of the perforation 4 selected with the anti-counterfeit medium A1 or the anti-counterfeit medium A2. Therefore, in order to be able to confirm with the reflected light, the diameter is larger than 80 μm. It is necessary to form large. This is because the perforations 4 do not penetrate the base material, so that the concave portions of the perforations 4 have the same color as the base material 1 and are difficult to contrast. Similarly, when observed with transmitted light, the diameter of the perforation 4 selected with the anti-counterfeit medium A1 or the anti-counterfeit medium A2 is difficult to confirm with the naked eye. Therefore, in order to be able to confirm with the transmitted light, the diameter is larger than 40 μm. Need to form.

(Modification 3)
FIG. 6 is a diagram illustrating the forgery prevention medium A4. In the anti-counterfeit medium A4, the optical change element 2 having the light reflective layer 5 is applied to a part of the base material 1, and the first image 11 (numeral 1) is applied to the area where the optical change element 2 is not applied. ) And the second image 12 (number 2) is formed in the region to which the optically variable element 2 is applied. The first image 11 is formed by a plurality of perforations 4 penetrating or not penetrating the base material in a region where the optical change element 2 is not provided. The second image 12 is formed by a plurality of light transmissive pixels 6 from which the light reflective base material of the light reflective layer 5 of the optical change element 2 is removed. The design of the first image 11 and the second image 12 is not particularly limited, and it is possible to form characters, symbols, numbers, color patterns, logo marks, designs, or the like.

(Modification 4)
FIG. 7A is a diagram illustrating the forgery prevention medium A5 in which the optical change element 2 is formed in a thread.

(Modification 5)
FIG. 7B is a diagram showing a forgery prevention medium A6 in which the optical change element 2 is formed in a window opening thread.

  The design of the image 3 formed by the first pixel 3a and the second pixel 3b is not particularly limited, and may form characters, symbols, numbers, color patterns, logo marks, designs, or the like. Is possible. Further, it is possible to embed information in the image 3.

  For example, as shown in FIG. 8, the image 3A formed by the first pixel 3a and the second pixel 3b has a large number of fine background perforations that become a background image (a region other than the letter T in the drawing) on the base material. 4a and / or the background light transmissive pixel 6a and the background perforation 4a and / or the background light transmissive pixel 6a, the latent image (the region of the letter T in the drawing) is shifted by approximately half a pitch in the X direction. In this example, the information perforations 4b and / or the information light transmissive pixels 6b are arranged. Further, the latent image may be formed by the information perforations 4b and / or the information light transmissive pixels 6b arranged with a substantially half-pitch shift in the Y direction.

  Further, as shown in FIG. 9, the image 3B is formed by information perforations 4b1 and / or information light transmitting pixels 6b1 arranged with a substantially half-pitch shift in the X direction, and information arranged with a substantially half-pitch shift in the Y direction. In this example, a plurality of latent image images (T, J) are formed by the perforation 4b2 and / or the information light transmitting pixel 6b2.

  Further, as shown in FIG. 10, the image 3C includes a large number of fine background perforations 4a and / or background light transmissive pixels 6a that become background images on the base material, and background perforations 4a and / or backgrounds that become latent images. In this example, the information perforation 4b and / or the information light transmissive pixel 6b are different from each other in the size of the perforation and / or the light transmissive pixel as compared with the light transmissive pixel 6a. In the drawing, the diameter of the information perforation 4b and / or the information light transmissive pixel 6b is larger than that of the background perforation 4a and / or the background light transmissive pixel 6a, but is larger than the background perforation 4a and / or the background light transmissive pixel 6a. Alternatively, the diameter of the information perforations 4b and / or the information light transmissive pixels 6b may be smaller. The larger diameter is preferably about 1.5 to 3 times the smaller diameter.

  Further, the positional relationship in the X direction and / or Y direction between the background perforation 4a and / or the background light transmissive pixel 6a and the information perforation 4b and / or the information light transmissive pixel 6b is not particularly limited. Further, as shown in FIG. 11, the image 3D includes a large number of fine background perforations 4a and / or background light transmissive pixels 6a serving as a background image on the substrate, and background perforations 4a and / or background light serving as a latent image. Compared to the transmissive pixel 6a, the information perforation 4b and / or the information light transmissive pixel 6b are different from each other in the arrangement angle of the perforation and / or the light transmissive pixel (the elliptical shape and the arrangement angle differ by 90 degrees in the drawing). This is an example. The arrangement angle is not particularly limited, but is preferably about 30 to 150 degrees.

  The images 3A, 3B, 3C, and 3D shown in FIGS. 8 to 11 are misaligned and / or sized with respect to the background perforation and / or background light transmitting pixels and the information perforation and / or information light transmitting pixels. Although they are different or arranged at different angles, the perforated and / or light transmissive pixels are fine so that, for the naked eye, the background perforated and / or background light transmissive pixels and the information perforated and / or information light transmissive pixels It is not possible to visually distinguish them.

  The images 3A and 3B in FIG. 8 or FIG. 9 are such that a latent image can be visually recognized by overlaying discriminating tools on which stripes extending in the vertical or horizontal direction are formed, and the base material in FIG. 10 or FIG. 11 is tilted. The latent image formed in the images 3C and 3D can be visually recognized. For example, the discriminating tool in which stripe lines are formed can be formed by, for example, YCM (yellow, cyan, magenta), YCM, YCM,... In the order of stripes extending in the vertical or horizontal direction, or RGB (red, green, Yellow), RGB, RGB... Can be formed in the order of stripes extending in the vertical direction or the horizontal direction, or lines can be formed by unevenness.

  Furthermore, the forgery prevention medium of the present invention can embed confidential information in the image 3. An example is shown below. The circular or polygonal shape in the drawings shown in FIGS. 12A to 12D is a perforated and light transmissive pixel. FIG. 12A is an example in which “0” and “1” are expressed by the interval between the row of perforations and / or light transmissive pixels, and the perforations and / or light transmissive pixels in the second row from the top. The interval (S, S ′) is divided into a wider interval (S) between the perforated and / or light transmissive pixels and a smaller interval (S ′) between the perforated and / or light transmissive pixels than the interval (S). The intervals between the perforations and / or the light-transmitting pixels are large, large, large, small, small, small, and thus information can be expressed as “111000” or “000111”. Similarly, the perforation and / or light transmissive pixel intervals (S, S ′) in the third row are small, large, large, small, small, and large. Thus, information can be expressed as “011001” or “100110”. Information can be similarly assigned to the first line and the fourth and subsequent lines.

  FIG. 12B is an example in which “0” and “1” are expressed by the positions of the perforations and / or light transmissive pixels, and the positions (T) of the perforations and / or light transmissive pixels in the first row. Is a perforation and / or light transmission that is displaced from the position (T) of the first row of perforations and / or light transmissive pixels in the second row of perforations and / or light transmissive pixels. The information can be expressed as “0101010” when the directional pixel (U ′) is “1” and the perforated and / or light transmissive pixel (U) not shifted is “0”. Also, the perforation and / or light transmissive pixel (U ′) shifted from the position (T) of the perforation in the first row is set to “0”, and the perforation and / or light transmissive pixel (U) not shifted is set to “0”. If “1”, information can be expressed as “1010101”. Similarly, information can be given to the first row and the third and subsequent rows.

  FIG. 12C is an example in which “0” and “1” are expressed by the size of the perforated and / or light transmissive pixels. In the perforated and / or light transmissive pixels in the second row from the top, If the large diameter perforation and / or light transmissive pixel (V ′) is “1” and the small perforation and / or light transmissive pixel (V) is “0”, information is expressed as “0101010”. can do. Also, if the perforation and / or light transmissive pixel (V ′) having a large diameter is “0” and the small perforation and / or light transmissive pixel (V) is “1”, information “1010101” is obtained. Can be expressed. Information can be similarly assigned to the first row and the third and subsequent rows.

  FIG. 12D shows an example in which “0” and “1” are expressed by the shape of the perforated and / or light transmissive pixels. In the second row of perforated and / or light transmissive pixels, Information can be expressed as “0101010” when a square perforation and / or light transmissive pixel (W ′) is “1” and a circular perforation and / or light transmissive pixel (W) is “0”. . If the polygonal perforation and / or light transmissive pixel (W ′) is “0” and the circular perforation and / or light transmissive pixel (W) is “1”, information is represented as “1010101”. be able to. Information can be similarly assigned to the first row and the third and subsequent rows.

  The images in which the confidential information of FIG. 12A to FIG. 12D is embedded are as follows: “Authentication discriminating body and fine discriminating device having fine perforations: Japanese Patent No. 3385461, Japanese Patent No. 3388388 Reference "," Anti-counterfeit formed body having perforated rows with information and its reading discrimination method: see Japanese Patent No. 3388389 ", and" Authenticity discrimination device having fine perforations: Japanese Patent No. 3306510 " It is described in. Therefore, different information (variable information) can be given for each medium.

  In the forgery prevention medium A6 shown in FIG. 13, the individual print information 10 and the image 3 of the base material 1 are formed. In the image 3, confidential information that cannot be viewed is embedded. The secret information can form the same information as the individual print information 10 or different information. FIG. 14 is an explanatory diagram of a method for authenticating the forgery prevention medium A7. As shown in FIG. 14, STEP 1 reads the individual print information 10 and the confidential information by the authentication client terminal. Confidential information can be read using the reading device described in “Reading device for binarized data given by fine punching: see Japanese Patent No. 3385357”, and printing information can read characters, designs, etc. It can be read by a general reading device.

STEP 2 authenticates the individual print information 10 and the confidential information read by the authentication server terminal via the network and the database in which the individual print information 10 and the confidential information are registered in advance in the authentication server terminal.

STEP 3 determines “true” when the individual print information 10 and the confidential information match at the authentication server terminal, and determines “false” when the individual print information 10 and the confidential information do not match, via the network. The determination result is communicated to the authentication client terminal for authentication.

  The diameter of the perforation of the anti-counterfeit medium of the present invention and the light transmissive pixel is preferably 40 to 1000 μm. When it is 40 μm or less, it becomes difficult to confirm an image when observed with transmitted light, and when it is 1000 μm or more, the strength of the substrate may be impaired. Moreover, it is preferable to form the pitch of perforated and light transmissive pixels in the range of 60 to 2000 μm. Further, the shape of the perforated and light transmissive pixels is not particularly limited, but can be formed by at least one of a circle, an ellipse, a square, a polygon, a line, and a special shape. In addition, since the image on which the forgery prevention medium is formed is formed by a laser processing machine, different variable information can be easily formed on each sheet. For example, the numbers may be different, such as “12345” for the first image and “12346” for the second image.

The substrate is not particularly limited as long as it can transmit light, and is made of paper or plastic. The basis weight in the case of a paper substrate is preferably about 10 to 100 g / m ² . The substrate may be structured like a multilayer paper. The thickness of the substrate is preferably about 50 to 1000 μm. Moreover, it is preferable that the thickness of the base material and the diameters of the perforated and light-transmitting pixels are about 0.5 to 2 times the thickness of the base material.

  In the anti-counterfeit medium of the present invention, when an optical change element is applied to one surface of a base material, a ground pattern is formed on one surface and / or the other surface of the base material in a region where the optical change element is applied. A printed pattern such as a colored pattern can be formed.

Furthermore, the anti-counterfeit medium of the present invention may be provided by embossing and printing.

(Method for producing anti-counterfeit medium)
The anti-counterfeit medium has a first pixel or a first one of the image by means for applying an optically changing element to a part of the substrate and a plurality of perforations penetrating or not penetrating the substrate by the first mechanical method. A second image of the image by means of forming the image of the image and a plurality of light transmissive pixels from which the light reflective substrate of the light reflective layer of the optically variable element has been removed by a chemical method or a second mechanical method. It can be produced by means of forming a pixel or a second image. These production procedures are not particularly limited.

  For example, an optical change element is applied to a part of the substrate in the first step, and the first step of the image is performed in the second step by a plurality of perforations penetrating or not penetrating the substrate by the first mechanical method. In the third step, the second step of the image is performed by the plurality of light-transmitting pixels from which the light-reflecting substrate of the light-reflecting layer of the optically variable element is removed by the second mechanical method. Pixels can be formed to produce an anti-counterfeit medium. In the first step, the first pixel of the image is formed by a plurality of perforations penetrating or not penetrating the substrate by the first mechanical method, and the chemical method or the second step is performed in the second step. The second pixel of the image is formed by a plurality of light transmissive pixels from which the light reflective substrate of the light reflective layer of the optical change element has been removed by a mechanical method. An optical change element can be added to the part to produce a forgery prevention medium.

In the first mechanical method, a plurality of perforations penetrating or not penetrating the substrate can be formed by a CO ₂ laser beam of a laser processing machine or a perforating needle of a perforator. In the second mechanical method, the light reflective substrate of the light reflective layer can be removed by a YVO ₄ or YAG laser of a laser processing machine. A chemical method can form a light-transmitting pixel by removing a part of the light-reflective layer with a solvent containing a 5% caustic soda solution at 20 to 50 ° C.

The type of laser is not particularly limited as long as it is a laser beam capable of forming the above-described perforation and light transmissive pixels, but the first laser beam is a CO ₂ laser (wavelength 10.6 μm), The laser beam 2 is preferably YVO ₄ (wavelength 1.06 μm) or YAG laser (wavelength 1.06 μm).

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, the content of this invention is not limited to the range of these Examples.

Example 1
A hologram was applied in a spot shape on the surface of a paper substrate having a thickness of about 80 μm using a hologram application machine. The hologram includes a protective layer 7, a diffraction grating pattern 8, a light reflective layer 5, and an adhesive layer 9. Next, an image 3 was formed by a laser processing machine across the boundary between the area where the hologram was affixed and the area where the hologram was not affixed.

The image 3 includes a first pixel 3a and a second pixel 3b. In the first pixel 3a, a plurality of circular perforations having a diameter of 85 μm and a perforation interval of 170 μm penetrating the base material 1 were formed in a region where the hologram 2 was not applied by a CO2 laser of a laser processing machine. In the second pixel 3b, the light-reflective substrate of the light-reflective layer 5 of the hologram 2 was removed with a YVO ₄ laser (MD-V9600 output 5% or more manufactured by Keyence Corporation) of a laser processing machine. By removing the light-reflecting substrate, the light-transmitting pixels 6 having a diameter of 40 μm and a distance of 170 μm were formed. An anti-counterfeit medium B1 having an image 3 as shown in FIG. 15 was obtained. In the forgery prevention medium B1, only the first pixel 3a can be confirmed when observed with reflected light, and the image 3 composed of the first pixel 3a and the second pixel 3b can be confirmed when observed with transmitted light.

(Example 2)
A paper substrate having a thickness of about 100 μm was prepared in which a band-like thread-shaped hologram was inserted at the paper making stage. The hologram includes a protective layer 7, a diffraction grating pattern 8, a light reflective layer 5, and an adhesive layer 9. Next, an image 3 was formed by a laser processing machine across the boundary between the area where the hologram was affixed and the area where the hologram was not affixed. The image 3 includes a first pixel 3a and a second pixel 3b. In the first pixel 3a, a plurality of circular perforations having a diameter of 40 μm and a perforation interval of 120 μm penetrating the substrate 1 were formed in a region where the hologram 2 was not applied by a CO2 laser of a laser processing machine.

In the second pixel 3b, the light-reflective substrate of the light-reflective layer 5 of the hologram 2 was removed with a YVO ₄ laser (MD-V9600 output 5% or more manufactured by Keyence Corporation) of a laser processing machine. By removing the light-reflective substrate, the light-transmitting pixels 6 having a diameter of 150 μm and a distance of 200 μm were formed. An anti-counterfeit medium B2 having an image 3 as shown in FIG. 16 was obtained. In the anti-counterfeit medium B2, the second pixel 3b can be confirmed when observed with reflected light, and the first pixel 3a is difficult to confirm. When observed with transmitted light, the first pixel 3a and the second pixel 3b are not observed. The image 3 consisting of the pixels 3b was confirmed.

It is a figure which shows the forgery prevention medium A1 and its sectional drawing. FIG. 3 is a diagram showing an optical change element 2 and a light-transmissive pixel 6 formed on the optical change element 2. It is a figure which shows the case where the forgery prevention medium A1 is observed by reflected light or transmitted light. It is a figure which shows the case where the forgery prevention medium A2 is observed by reflected light or transmitted light. It is a figure which shows the forgery prevention medium A3 in which the some perforation which is the 1st pixel 3a is non-penetrating. It is a figure which shows the forgery prevention medium A4. It is a figure which shows the forgery prevention medium A5 in which the optical change element 2 was formed in the thread | sled, and the forgery prevention medium A6 in which the optical change element 2 was formed in the window opening thread | sled. It is a figure which shows the example in which the latent image was formed in the image 3A. It is a figure which shows the example in which the latent image was formed in the image 3B. It is a figure which shows the example in which the latent image was formed in the image 3C. It is a figure which shows the example in which the latent image was formed in the image 3D. It is a figure which shows the example by which confidential information was embedded in the image. It is a figure which shows the forgery prevention medium A6. It is explanatory drawing of the method of authenticating the forgery prevention medium A6. It is a figure which shows the forgery prevention medium B1. It is a figure which shows the forgery prevention medium B2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Optical change element 3, 3A, 3B, 3C, 3D Image 3a 1st pixel 3b 2nd pixel 4 Perforation 4a Background perforation 4b, 4b1, 4b1, 4b2 Information perforation 5 Light reflective layer 6 Light transmission Pixel 6a background light transmissive pixel 6b, 6b1, 6b2 information light transmissive pixel 7 protective layer 8 diffraction grating pattern 9 adhesive layer 10 individual print information A1, A2, A3, A4, A5, A6, A7, B1, B2 counterfeit Prevention medium S Widely perforated holes S 'Narrowly spaced perforated holes T Perforated position U Perforated holes not displaced from the perforated position U' Perforated holes displaced from the perforated position V Small diameter perforated holes V 'Large diameter perforated holes W Circular Drilling W 'Polygonal drilling

Claims (9)

An optically variable element having a light reflective layer is applied to a part of the substrate,
A first image is formed in a region to which the optical change element is not applied, and a second image is formed in a region to which the optical change element is applied;
The first image is formed by a plurality of perforations penetrating or non-penetrating the base material in a region where the optically changing element is not provided,
The anti-counterfeit medium, wherein the second image is formed by a plurality of light-transmissive pixels from which the light-reflective substrate of the light-reflective layer of the optical change element is removed. An optically variable element having a light reflective layer is applied to a part of the substrate,
An image is formed in a region not provided with the optical change element and a region provided with the optical change element,
The image is composed of a first pixel and a second pixel,
The first pixel is formed by a plurality of perforations penetrating or non-penetrating the base material in a region where the optically changing element is not provided,
The anti-counterfeit medium, wherein the second pixel is formed of a plurality of light-transmissive pixels from which the light-reflective substrate of the light-reflective layer of the optical change element is removed. The anti-counterfeit medium according to claim 1 or 2, wherein the shape of the perforations and the light transmissive pixels is at least one of a circle, an ellipse, a square, a polygon, and a special shape. The first image and the second image are arranged adjacent to each other or close to each other, and a predetermined shape (pattern) is formed by the first image and the second image. The medium for preventing forgery according to 1 or 3. The forgery prevention medium according to claim 1, 2, 3, or 4, wherein the diameter of the perforations and the light-transmitting pixels is 40 to 1000 µm. An optical change element having a light-reflective layer is provided on a part of the substrate, and the first pixel and the first pixel are provided in a region where the optical change element is not provided and a region where the optical change element is provided. In the method for producing an anti-counterfeit medium on which an image composed of two pixels is formed,
Means for applying the optically variable element to a part of the substrate;
Means for forming the first pixel by a plurality of perforations penetrating or non-penetrating the substrate by a first mechanical method;
Produced by means for forming the second pixel by a plurality of light transmissive pixels from which the light reflective substrate of the light reflective layer of the optically variable element has been removed by a chemical method or a second mechanical method. A method for producing a forgery prevention medium, which is characterized in that: The method for producing a forgery prevention medium according to claim 6, wherein the first mechanical method forms a plurality of perforations penetrating or non-penetrating the base material by a CO ₂ laser or a perforating needle. 7. The method for producing a forgery prevention medium according to claim 6, wherein the second mechanical method is such that the light reflective substrate of the light reflective layer is removed by a YVO ₄ or YAG laser. 7. The method for producing an anti-counterfeit medium according to claim 6, wherein the chemical method is such that the light-reflecting substrate of the light-reflecting layer is removed by a solvent.

Images