JP5310984B2 - Anti-counterfeit medium having flexibility and its verification method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium for forgery prevention having flexibility which can easily perform forgery prevention and truth/falsehood determination for articles, and to provide a verification method therefor. <P>SOLUTION: In the medium for forgery prevention, having flexibility, a support body (11) having flexibility is provided with a latent image device (12), having a refractive layer and a verification device (13) in the surface same as the support body (11) or in the surface different therefrom; and when the support body (11) is deformed and the verification device (13) matches the latent image device (12), different images appear when the same surfaces as the support body (11) are face one another and when the different surfaces face one another. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an anti-counterfeit medium using a latent image for the purpose of displaying hidden characters and hidden patterns for performing anti-counterfeiting and authenticity determination of articles by using a filter. Relates to an anti-counterfeit medium having flexibility, in which a latent image device and a verification device are arranged on the same surface, and a verification method thereof.

  Conventionally, securities such as banknotes, gift certificates, passports, and authentication media have been pasted with a medium that is difficult to forge as a countermeasure against forgery. In this case, authenticity determination is performed by visual determination (overt function) or determination using a verifier (covert function).

  However, a medium for preventing forgery that can be visually checked for authenticity is easily forged. Therefore, in recent years, a latent image technique using a polarization technique has been proposed, and a latent image appears by overlapping a polarizing film to determine authenticity.

  However, in order to determine the authenticity of the latent image device, a dedicated verifier such as a polarizing film is required. Usually, a retailer or a service provider can prepare a verifier for authenticity determination and perform authenticity determination assuming a voucher or ticket received from a consumer. However, it is unlikely that a general consumer has obtained a verifier in advance assuming these situations, and authentication cannot be made.

  In order to solve this problem, there is a proposal of a medium in which a verifier and a latent image device are integrated (see, for example, Patent Document 1).

  However, as in this proposal, when the verifier is rotated 90 °, a positive image is expressed as a negative, but it is difficult to rotate the verifier 90 ° in a medium in which the verifier and the latent image device are integrated. It is difficult to confirm that the image is reversed.

Prior art documents are shown below.
Special table 2001-525080 gazette

  The present invention is intended to solve such problems of the prior art, and provides a forgery prevention medium having a flexibility that can easily prevent counterfeiting of articles and determine authenticity, and a method for verifying the same. Objective.

The present invention has been made to solve the above problems, and the invention according to claim 1 of the present invention is the same as the support (11) having the flexibility. It comprises a latent image device (12) and a verification device (13) provided with a reflective layer in a plane or on a different surface, and deforms the support (11) to verify the latent image device (12) 13) A flexible device including a latent image device (12) and a verification device (13) in which different images appear depending on whether the same surface of the support (11) faces or when different surfaces face each other. A forgery prevention medium having flexibility, wherein the latent image device (12) has a reflective layer and has a plurality of optical axes, and the verification device (13) Is a linear polarizer , When the same surface is facing, and an optical axis which is installed such that the long axis or short axis of the rectangular anti-counterfeit medium is one of the latent image device (12) in the direction of the axis to ± 22.5 ° When the optical axis of the verification device (13) coincides and different surfaces face each other, the latent image device is arranged such that the optical axis of the other latent image device (12) coincides with the optical axis of the verification device (13). (12) A forgery prevention medium having flexibility in which the verification device (13) is arranged.

According to a second aspect of the present invention, there is provided a latent image device (12) having a flexible support (11) provided with a reflective layer on the same or different surface of the support (11), and verification. When the device (13) is provided, and the same surface of the support (11) faces when the support (11) is deformed and the verification device (13) is aligned with the latent image device (12) A forgery prevention medium having a latent image device (12) and a verification device (13) in which different images appear when different surfaces face each other, and the latent image device (12) reflects When the same plane faces when the verification device (13) is a device having a plurality of optical axes and having a linear polarizer and phase retarders on both sides, the latent image device ( 12) One optical axis with When the optical axis of the phase retarder on either side of the verification device (13) coincides and the different planes face each other, the other optical axis of the latent image device (12) and the other optical axis of the verification device (13) The medium is a forgery prevention medium having flexibility in which the latent image device (12) and the verification device (13) are arranged so that the optical axis of the phase retarder of the surface coincides.

In the invention according to claim 3 of the present invention, the long axis side of the rectangular anti-counterfeit medium having flexibility according to claim 1 or 2 is deformed so that the same surface faces each other. This is a verification method in which an authenticity determination is performed by causing an image that appears different from the case where the same surface faces when an image appearing in the case and the long surface side are deformed to face each other to face each other.

  The medium for preventing forgery having flexibility according to the present invention includes a latent image device and a verification device provided with a reflective layer on the same or different surface of the support on the support having flexibility. And a latent image device and a verification device in which different images appear when the same surface of the support faces and when a different surface faces when the support is deformed and the verification device is aligned with the latent image device Thus, it is possible to accurately and easily determine the authenticity of an article using only a medium without using a special verifier.

  The embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7, but is not particularly limited thereto.

  FIG. 1 shows one embodiment of a flexible anti-counterfeit medium according to the present invention, (a) is a plan view, (b) is a side sectional view, and FIG. FIG. 3 is a side sectional view showing a state in which the support is deformed so that the same surface of the support faces when the verification device is aligned with the latent image device of the anti-counterfeit medium having flexibility. It is a side sectional view showing a state in which the support is deformed so as to face each other on a different surface of the support when the verification device is matched with the latent image device of the anti-counterfeit medium having flexibility according to the invention, FIG. 4 shows another embodiment of the flexible anti-counterfeit medium according to the present invention, (a) is a plan view, (b) is a side sectional view, and FIG. 5 is according to the present invention. The other Example of the medium for anti-counterfeit which has flexibility is shown, (a) is a top view FIG. 6B is a side sectional view, and FIG. 6 is a plan view showing an example of an image that appears when the medium shown in FIG. 5 is deformed as shown in FIG. 2 and the verification device is superimposed on the latent image device. FIG. 7 is a plan view showing an embodiment of an image that appears when the medium shown in FIG. 5 is deformed as shown in FIG. 3 and the verification device is superimposed on the latent image device.

  As shown in FIG. 1, the medium for preventing forgery having flexibility according to one embodiment of the present invention has a flexible support (11) on the same or different surface of the support (11). A latent image device (12) having a reflective layer is provided, a light transmitting portion (14) is provided on the support (11), and a verification device (13) is provided on the light transmitting portion (14). As shown in FIG. 2, when the support (11) is deformed and the verification device (13) is aligned with the latent image device (12), the same surface of the support (11) faces. As shown in FIG. 3, the medium is a flexible anti-counterfeit medium having a latent image device (12) and a verification device (13) in which different images appear when different surfaces face each other. Further, it is necessary that the different images are designed in a relationship between negative and positive.

  When the latent image device (12) includes a reflective layer and has a plurality of optical axes, and the verification device (13) is a linear polarizer, a single latent image device (12) is formed when the same surface faces each other. When the optical axis of the image device (12) coincides with the optical axis of the verification device (13) and different surfaces face each other, the optical axis of the other latent image device (12) and the optical axis of the verification device (13) Are arranged such that the latent image device (12) and the verification device (13) match.

  The latent image device (12) includes a reflective layer and has a plurality of optical axes, and the verification device (13) is a device in which a linear polarizer is provided with a phase retarder on both sides. When one surface of the latent image device (12) and the optical axis of the phase retarder on either surface of the verification device (13) coincide with each other, and different surfaces face each other, The latent image device (12) and the verification device (13) are arranged so that the other optical axis of the image device (12) and the optical axis of the phase retarder on the other surface of the verification device (13) coincide with each other. Yes.

  Here, the support (11, 29, 40) that can be used in the present invention will be described. It is essential that the support has flexibility, and it may be opaque or transparent. However, as shown in FIGS. 2 to 3, since the verification device (13) may perform verification over the support, in the case of an opaque support, there is no need to devise such as providing a window on the support. must not.

  Further, it is preferable that the birefringence of the support is controlled even if it is transparent. For example, a plastic film produced by stretching can be used. There are uniaxially stretched and biaxially stretched films depending on how to stretch. These include cellophane, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyolefin (PO), ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVA), polyvinyl chloride, polyethylene naphthalate (PEN). Polyethylene terephthalate (PET), nylon, acrylic, triacetyl cellulose (TAC) film, and the like.

  Next, a combination of the latent image device (12) and the verification device (13) will be described. Since the present invention is characterized in that different images appear when verified as shown in FIG. 2 and when verified as shown in FIG. 3, the shape of the support, the latent image device (12), and the verification device The position on the support (13) and the combination of the latent image device (12) and the verification device (13) become important. In the present invention, for ease of verification, the shape of the support is rectangular, and the latent image device (12) and the verification device (13) are positioned at both ends of the long axis of the rectangle as shown in FIG. It is desirable to arrange in.

A device that can be used in the present invention is a polarizer. This polarizer is an absorption polarizer in which PVA is impregnated with iodine or a dichroic dye and stretched and aligned, an absorption polarizer in which a dichroic dye is aligned in an alignment film, or a cholesteric liquid crystal with λ A reflective polarizer combining a / 4 phase retarder, a reflective polarizer laminated with a birefringent multilayer film, a prism polarizer formed into a lenticular lens shape with a Brewster angle, and a birefringent material formed in a diffraction grating shape A birefringent diffractive polarizer, a diffractive polarizer in which grooves of a diffractive structure are formed deeply, and the like can be used. In addition to this, any element that can separate or extract a specific polarization component by reflected light or transmitted light can be used, and the polarizer of the present invention is used.

  The latent image device (12) is formed by combining the reflection layer, the polarizer, and the phase shifter in which the optical axis directions are changed in a pattern, and partially changes the polarization direction of the latent image device (12) in the pattern. Method can be used. For example, a λ / 4 phase retarder is disposed on the reflective layer. When linearly polarized light in the same direction as the optical axis of the phase retarder is incident from the phase retarder side, this linearly polarized light is not affected by the phase retarder, so it is reflected and reflected while maintaining the polarization state. Is not affected by the phase retarder. Then, when a linear polarizer is used, it is not affected by the phase retarder, so that it passes through the linear polarizer as it is. However, when linearly polarized light is incident on the optical axis of the phase retarder at an angle of 45 °, the linearly polarized light is affected by the phase retarder and reflected with a phase difference of λ / 4, and the light is again reflected. When passing through, a phase difference of λ / 4 is added due to the influence of the phase difference. That is, light that is incident on the optical axis of the phase retarder with linearly polarized light being inclined by 45 ° is reflected with a phase difference of λ / 2, and the plane of polarization of the linearly polarized light is rotated by 90 °. Then, when a linear polarizer is used, the linearly polarized light with the 90 ° polarization plane rotated blocks the light. In this way, by changing the optical axis direction of the phase retarder with a pattern, the polarization state of partially incident polarized light can be changed.

  A liquid crystal material having birefringence can be used as means for changing the optical axis of the phase retarder by a pattern. Birefringence means that the refractive index of a substance varies depending on the direction of the optical axis, and therefore the speed of light varies when passing through the substance. Therefore, a phase difference is generated in the light after passing through the substance by the difference in the passing speed. Here, the alignment film is subjected to an alignment treatment in a biaxial direction, and a liquid crystal is applied thereon, whereby a biaxially aligned liquid crystal can be obtained. The retardation value can be determined by the birefringence and film thickness of the liquid crystal.

  The λ / 4 phase difference is used for the phase difference elements a and b in FIGS. 4 (21) and (23) and is arranged on the metal reflection layer in a pattern, and the optical axes of the two phase difference elements a and b ( 22) and (24) are preferably a latent image device in which a rectangular support is installed so as to be in the direction of ± 22.5 ° with respect to the major axis or minor axis. The liquid crystal can be designed and used as a λ / 4 phase retarder for this phase retarder. At this time, the verification device uses a linear polarizer, and the optical axis (27) is arranged in the direction reversed left and right with respect to the optical axis (22) or (24) of the λ / 4 phase difference element arranged in the latent image device.

  For example, in the case where the optical axis (27) of the verification device is arranged in the direction left and right reversed with respect to the optical axis (22) of the phase retarder, if the same surface is faced by deforming the long axis side of the medium, The direction of the optical axis (27) coincides with the optical axis (22) of the phase retarder, and an angle difference of 45 ° is made from the optical axis (24) of the phase retarder. As a result, the direction of the incident linearly polarized light is maintained in the portion of the phase retarder (21), and the light is transmitted. In the portion of the phase retarder (23), the polarization plane of the incident linearly polarized light is rotated by 90 °. The light is blocked by the linear polarizer.

  Further, when the long axis side of the medium is deformed so that different surfaces face each other, the direction of the optical axis (27) of the verification device coincides with the optical axis (24) of the phase retarder, and the optical axis (22 of the phase retarder). ) Has an angle difference of 45 °. As a result, the polarization plane of the incident linearly polarized light is rotated by 90 ° in the portion of the phase retarder (21), the light is blocked by the linear polarizer as the verification device, and the portion of the phase retarder (23) is in the incident straight line. The direction of polarization is maintained and light is transmitted.

A λ / 8 phase retarder is used for the phase retarders c and d in FIGS. 5 (31) and (33) and arranged on the metal reflection layer in a pattern, and the optical axes of the two phase retarders c and d ( 32) and (34) are preferably a latent image device in which a rectangular support is arranged in a direction of ± 22.5 ° with respect to the major axis or minor axis. The liquid crystal can be designed and used as a λ / 8 phase retarder. At this time, the verification device creates a polarizer (39) between two phase retarders (38) as shown in FIG. At this time, the phase difference (38) is a λ / 8 phase difference, and the optical axis (37) of the polarizer and the optical axis (41) of the phase difference are arranged with an angle difference of 45 °. Further, the optical axis (41) of the phase retarder of the verification device is arranged so as to be reversed left and right with respect to the optical axis (32) or (34) of the phase retarder of the latent image device.

  In addition, the latent image device and the verification device may be prepared by transferring a transfer foil having each function and transferring it to the support, or by printing directly on the support, or having each function. You may laminate and produce a film.

  The present invention will be described in detail with specific examples.

<Example 1>
An unstretched triacetyl cellulose (TAC) film was used as a support having flexibility. The latent image device produced a transfer foil and transferred it to a TAC film. Moreover, the verification device was stuck using the absorption type polarizer which impregnated the iodine and impregnated the polyvinyl alcohol (PVA) film, and was oriented.

The latent image device was created as follows. Biaxially stretched polyethylene terephthalate (PET) film (trade name: Lumirror 25T60 manufactured by Toray Industries, Inc.) as a base material and photo-alignment agent (trade name: IA-01 manufactured by Dainippon Ink & Chemicals, Inc.) applied by microgravure. Membrane was performed. This photo-alignment agent is a material having a liquid crystal alignment force in the polarization direction when irradiated with 365 nm polarized light. Therefore, the surface of the photo-alignment film is irradiated with ² J / cm ² using polarized ultraviolet rays, and irradiated with a pattern of ² J / cm ² in a direction with an angle difference of 45 ° with respect to the polarization direction of the entire surface. went. Thereafter, UV curable liquid crystal (trade name: UCL-008, manufactured by Dainippon Ink & Chemicals, Inc.), which is a liquid crystalline monoacrylate, was applied by microgravure. Since the birefringence of UCL-008 is 0.18, the film thickness is set to 0.76 μm so that the phase difference value becomes λ / 4 with respect to the light having a central wavelength of 550 nm of visible light. I made it. Furthermore, aluminum vapor deposition was performed so that a film thickness might be set to 50 nm, and the metal reflective layer was provided. In order to form a transfer foil, a resin of a copolymer of vinyl chloride and vinyl acetate was converted into an ink and coated with a thickness of 2 μm with a microgravure on the metal reflective layer, and an adhesive was provided. This was thermally transferred to a support with a roll transfer machine so that the photo-alignment film was the uppermost surface. When transferring, the transfer was performed so that the orientation direction of one liquid crystal was inclined by 22.5 ° with respect to the minor axis of the support. On the other hand, the verification device was attached so that the optical axis was inclined by 22.5 ° with respect to the minor axis of the support.

  As shown in FIG. 2, when the latent image device was viewed through the verification device with the support deformed, the circular image as shown in FIG. 6 appeared. As shown in FIG. 4, an image appears in which the portion of the phase retarder (23) is blackened because light is blocked, and the portion of the phase retarder (21) shows a metal reflection color.

  Further, as shown in FIG. 3, when the latent image device was viewed with the verification device after the support was deformed, an image as shown in FIG. 7 in which the negative / positive was reversed from FIG. 6 appeared. In the portion of the phase retarder (23), a metal reflection color appeared, and the portion of the phase retarder (21) appeared black. In this way, an image different from that in the verification as shown in FIG. 2 appeared.

As described above, the verification method of the anti-counterfeit medium is an image that appears when the major axis side of the anti-counterfeit medium having flexibility is deformed so that the same surface faces each other, and the major axis side is deformed. When different faces are made to face each other, an image different from the case where the same faces are made to face is made to appear and authenticity determination is performed.

One Example of the medium for anti-counterfeit which has the flexibility concerning this invention is shown, (a) is a top view, (b) is a sectional side view. It is a sectional side view showing a state in which the support is deformed so that the same surface of the support faces when the verification device is aligned with the latent image device of the anti-counterfeit medium having flexibility according to the present invention. . It is a sectional side view which shows the state which deform | transformed the support body so that it might face in a different surface of a support body when match | combining a verification device with the latent image device of the medium for a forgery prevention which has the flexibility concerning this invention. . The other Example of the medium for anti-counterfeit which has the flexibility concerning this invention is shown, (a) is a top view, (b) is a sectional side view. The other Example of the forgery prevention medium which has the flexibility which concerns on this invention is shown, (a) is a top view, (b) is a sectional side view. FIG. 6 is a plan view illustrating an example of an image that appears when the medium illustrated in FIG. 5 is deformed as illustrated in FIG. 2 and the verification device is superimposed on the latent image device. FIG. 6 is a plan view showing an example of an image that appears when the medium shown in FIG. 5 is deformed as shown in FIG. 3 and a verification device is superimposed on a latent image device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11, 29, 40 ... Flexible support body 12 ... Latent image device 13 ... Verification device 14 ... Light transmission part 21 ... Phase difference element a
22 ... Optical axis of phase difference element a 23 ... Phase difference element b
24: Optical axis of phase difference element b 25: Phase difference element arranged in pattern 26, 28: Polarizer 27: Optical axis of polarizer 31: Phase difference element c
32 ... Optical axis of phase difference c 33 ... Phase difference d
34 ... Optical axis of phase difference element d 35 ... Phase difference element arranged in pattern 36, 39 ... Polarizer 37 ... Optical axis of polarizer 38 ... Phase difference element 41 ... Optical axis of phase retarder

Claims (3)

A support having flexibility is provided with a latent image device provided with a reflective layer on the same surface or a different surface of the support and a verification device, and the support is deformed to the latent image device. The anti-counterfeiting of a rectangular with a flexible image having a latent image device and a verification device in which different images appear depending on whether the same surface of the support faces or a different surface when the verification device is combined Medium,
When the latent image device has a reflective layer and has a plurality of optical axes, and the verification device is a linear polarizer, when the same surface faces, a forgery of a rectangular shape of one latent image device Other latent image devices when the optical axis of the verification device is aligned with the optical axis of the verification device and the optical axis of the verification device facing each other, with the major axis or minor axis of the prevention medium in the direction of ± 22.5 ° An anti-counterfeit medium having flexibility, in which the latent image device and the verification device are arranged so that the optical axis of the optical device matches the optical axis of the verification device. A support having flexibility is provided with a latent image device provided with a reflective layer on the same surface or a different surface of the support and a verification device, and the support is deformed to the latent image device. The anti-counterfeiting of a rectangular with a flexible image having a latent image device and a verification device in which different images appear depending on whether the same surface of the support faces or a different surface when the verification device is combined Medium,
The latent image device comprises a reflective layer, and has a plurality of optical axes, the verification device Ri Ah in the device provided with the phase Sako on both sides linear polarizer, when the same surface is facing, latent When one optical axis of the image device matches the optical axis of the phase retarder on either side of the verification device and the different surfaces face each other, the other optical axis of the latent image device and the other of the verification device latent image device and the anti-counterfeit medium having variable Tou of placing the verification device such that the optical axis of the phase Sako matching surface. An image that appears when the long axis side of the rectangular anti-counterfeit medium having the flexibility of claim 1 or 2 is deformed so that the same surfaces face each other, and the long axis side A verification method for performing authenticity determination by causing an image different from the case where the same surfaces face each other to appear when different surfaces are deformed to face each other.