JP2009139453A - Medium for forgery prevention having flexibility, and verification method therefor - Google Patents

Medium for forgery prevention having flexibility, and verification method therefor Download PDF

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Publication number
JP2009139453A
JP2009139453A JP2007313176A JP2007313176A JP2009139453A JP 2009139453 A JP2009139453 A JP 2009139453A JP 2007313176 A JP2007313176 A JP 2007313176A JP 2007313176 A JP2007313176 A JP 2007313176A JP 2009139453 A JP2009139453 A JP 2009139453A
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Prior art keywords
latent image
device
optical axis
verification device
image device
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JP2007313176A
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JP5310983B2 (en
Inventor
Akira Kubo
Mihoko Nagayoshi
Hideki Ochiai
章 久保
美保子 永吉
英樹 落合
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Toppan Printing Co Ltd
凸版印刷株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D2033/00Structure or construction of identity, credit, cheque or like information-bearing cards
    • B42D2033/26Liquid-crystal material

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium for forgery prevention having flexibility which can easily perform forgery prevention and truth/falsehood judgement for articles, and to provide a verification method therefor. <P>SOLUTION: The medium for forgery prevention having flexibility has: a support body (11) having flexibility is provided with a latent image device (12), and a verification device (13) in the surface which is identical to that in 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 in the case where the same surfaces of the support body (11) are face each other and when the different surfaces face one another. <P>COPYRIGHT: (C)2009,JPO&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. A latent image device (12) and a verification device (13) are provided in the plane or in different planes, and the support (11) is deformed to align the verification device (13) with the latent image device (12). Sometimes the counterfeiting prevention device having the latent image device (12) and the verification device (13) in which different images appear depending on whether the same surface of the support (11) faces or a different surface faces each other. Media.

The invention according to claim 2 of the present invention is the counterfeit for preventing counterfeit having flexibility according to claim 1, wherein the different image has a relationship between negative and positive. It is a prevention medium.

  According to a third aspect of the present invention, in the flexible anti-counterfeit medium according to the first or second aspect, the latent image device (12) has a plurality of optical axes, and the verification device ( When 13) is a linear polarizer and the same surface faces, the optical axis of one latent image device (12) matches the optical axis of the verification device (13), and different surfaces face each other. The latent image device (12) and the verification device (13) are arranged so that the optical axis of the other latent image device (12) and the verification device (13) coincide with each other. It is a prevention medium.

  The invention according to claim 4 of the present invention is the anti-counterfeit medium having flexibility according to claim 1 or 2, wherein the latent image device (12) has a right circular polarization property and a left circular polarization property. The verification device (13) has the flexibility to function as a right circular polarizer from one surface and to function as a left circular polarizer from the other surface. It is a medium for preventing forgery.

  The invention according to claim 5 of the present invention is the counterfeit prevention medium having flexibility according to claim 1 or 2, wherein the latent image device (12) has a plurality of optical axes, and the verification device ( 13) is a device in which a phase polarizer is provided on both sides of a linear polarizer, and one of the optical axis of the latent image device (12) and the verification device (13) when the same surface faces each other When the optical axis of the phase retarder on the other surface coincides and different surfaces face each other, the other optical axis of the latent image device (12) and the optical axis of the phase retarder on the other surface of the verification device (13) And a latent image device (12) and a verification device (13) are arranged so as to coincide with each other.

  The invention according to claim 6 of the present invention is a case where the major surface of the flexible anti-counterfeit medium according to any one of claims 1 to 5 is deformed so that the same surfaces face each other. This is a verification method in which an authenticity determination is performed by causing an image to appear different from the case where the same surface is faced when the major surface is deformed so that different surfaces face each other.

  The medium for preventing forgery having flexibility according to the present invention comprises a support having flexibility and a latent image device and a verification device on the same surface or different surfaces of the support, and the support. When the verification device is deformed and the verification device is aligned with the latent image device, the latent image device and the verification device in which different images appear depending on whether the same surface of the support faces or a different surface faces Therefore, 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)
FIG. 5 is a sectional side view, FIG. 5 shows still another embodiment of the flexible anti-counterfeit medium according to the present invention, (a) is a plan view, and (b) is a side sectional view. 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 the medium shown in FIG. FIG. 4 is a plan view showing an example of an image that appears when the verification device 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). 2 is provided with a latent image device (12), a support (11) is provided with a light transmission part (14), and a verification device (13) is provided on the light transmission part (14), as shown in FIG. As shown in FIG. 3, 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 described above, the medium is a flexible anti-counterfeit medium having the latent image device (12) and the 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.

  The latent image device (12) has a plurality of optical axes. When the verification device (13) is a linear polarizer and the same surface faces, the latent image device (12) When the optical axis 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) coincides with the optical axis of the verification device (13). A latent image device (12) and a verification device (13) are arranged.

  The latent image device (12) has two regions, a region having right circular polarization and a region having left circular polarization, and the verification device (13) has a right circular polarization from one surface. It functions as a child and functions as a left circular polarizer from the other side.

  Further, when the latent image device (12) has a plurality of optical axes, and the verification device (13) is a device that includes a linear polarizer and phase retarders on both sides, the same surface faces each other. When the optical axis of one phase of the latent image device (12) and the optical axis of the phase retarder on either side of the verification device (13) match and different surfaces face each other, the latent image device (12) The latent image device (12) and the verification device (13) are arranged so that the other optical axis matches the optical axis of the phase retarder on the other surface of the verification device (13).

  Here, the support (11, 29, 42) 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 oriented, or an absorption polarizer in which a dichroic dye is oriented in the form of an alignment film, or a cholesteric liquid crystal with λ A reflective polarizer combined with 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 optical axis directions of the polarizer and the retarder with a pattern, and a method of partially changing the polarization direction of the latent image device (12) with the pattern is used. I can do it. For example, when the optical axis of the λ / 2 phase retarder coincides with or is inclined by 90 ° with respect to the optical axis of the linear polarizer, it is not affected by the phase retarder. However, if the optical axis of the phase retarder is inclined by 1φ with respect to the optical axis of the linear polarizer, the polarization plane is inclined by 2φ. For example, when a λ / 2 phase retarder is formed at an angle of 45 ° with respect to the polarizer optical axis, the plane of polarization rotates 90 °. 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.

  As shown in FIG. 4, the polarizer (30) and the phase retarder (25) arranged in a pattern can be combined to form a latent image device. On the polarizer (30), λ / 2 phase retarders are arranged in a pattern for the phase retarders a and b of (21) and (23), and the optical axes (22 of the two phase retarders a and b) ) And (24) are preferably a latent image device in which a rectangular support is arranged so that the major axis or minor axis is in the direction of ± 22.5 °. The liquid crystal can be designed and used as a λ / 2 phase retarder for this phase retarder. An absorbing layer may be provided to improve the contrast. At this time, it arrange | positions so that the optical axis of a polarizer (30) may be parallel or 90 degrees with the optical axis (22) or (24) of phase differencer a and b. At this time, a linear polarizer is used as the verification device, and the optical axis (27) of the polarizer of the verification device is reversed left and right with respect to the optical axis (22) or (24) of the phase difference a, b of the latent image device. Deploy.

  For example, assuming that the optical axis of the polarizer of the latent image device is made to coincide with the optical axis (22) of the phase retarder a (21), the light passing through the phase retarder a (21) Since it is not affected, the light passing through the polarization state is maintained and the light passing through the phase difference b (23) is incident on the optical axis of the phase difference at an angle of 45 °. The light whose polarization direction is inclined by 90 ° from the previous polarization state passes. For such a latent image device, when the optical axis (27) of the verification device is arranged in the direction horizontally reversed with respect to the optical axis (22) of the phase difference element a (21), the major axis side of the medium is deformed. If the same surface is made to face, the direction of the optical axis (27) of the verification device coincides with the optical axis (22) of the phase difference a (21). Then, the light passing through the phase retarder a (21) passes through the verification device, and the light passing through the phase retarder b (23) is blocked by the verification device because the polarization plane is rotated by 90 °.

  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 difference b. Then, since the plane of polarization of the light passing through the phase retarder a (21) is inclined by 90 ° with respect to the optical axis (27) of the verification device, the light is blocked and the phase retarder b (23) is verified. Light is transmitted because it matches the optical axis of the device.

  As shown in FIG. 5, the phase retarder (35) is arranged in a pattern using λ / 4 phase retarders for the phase retarders c and d of (31) and (33), and two phase retarders c and d are used. The optical axes (32) and (34) may be a latent image device in which the long and short axes of a rectangular support are arranged in a direction of ± 45 ° with respect to the long axis or short axis. An absorbing layer may be provided to improve the contrast. At this time, the optical axis of the polarizer (36) and the optical axes (32) or (34) of the phase retarders c and d are arranged with an angle difference of 45 °. For this latent image device, a verification device is manufactured by sandwiching a polarizer (40) between two phase retarders (39) as shown in FIG. At this time, the phase retarder (39) is a λ / 4 phase retarder, and the optical axis (38) of the polarizer and the optical axis (41) of the phase retarder are arranged with an angle difference of 45 °. In this case, the direction of the optical axis of the verification device is not particularly specified.

  A circularly polarized reflective polarizer can also be used for the polarizer (36) of FIG. The phase retarders c and d of (31) and (33) are arranged in a pattern using λ / 4 phase retarders, and the optical axes (32) and (34) of the two phase retarders c and d are rectangular. It is desirable to use a latent image device that is arranged so that the major axis or minor axis of the support is in the direction of ± 45 °. At this time, a linear polarizer is used for the verification device, and the optical axis (38) of the polarizer of the verification device is 45 ° with respect to the optical axis (32) or (34) of the phase shifter c, d of the latent image device. Tilt and place.

  In addition, when a circularly polarized reflective polarizer is used for the polarizer (36) in FIG. 5, λ / 2 phase difference is used for the phase retarders c and d in (31) and (33) and arranged in a pattern. In addition, the optical axes (32) and (34) of the two phase retarders c and d are latently arranged in a direction of ± 22.5 ° with respect to the long or short axis of the rectangular support. An imaging device is desirable. For this latent image device, a verification device is manufactured by sandwiching a polarizer (40) between two phase retarders (39) as shown in FIG. At this time, the phase retarder (39) is a λ / 4 phase retarder, and the optical axis (38) of the polarizer and the optical axis (41) of the phase retarder are arranged with an angle difference of 45 °.

  A cholesteric liquid crystal may be used for the circularly polarized reflection type polarizer. The latent image device may be printed with a pattern of cholesteric liquid crystal that reflects clockwise circularly polarized light and cholesteric liquid crystal that reflects counterclockwise circularly polarized light.

  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. A cholesteric liquid crystal (manufactured by Merck & Co., Inc.) was coated thereon with a micro gravure. To this, a sumi ink with a thickness of 1.4 μm and a vinyl chloride / vinyl acetate copolymer resin was converted into an ink and coated with a microgravure in a thickness of 2 μm to provide an absorption layer and an adhesive, respectively. This was thermally transferred to a support with a roll transfer machine so that the photo-alignment film was the uppermost surface. At the time of transfer, transfer was performed so that the alignment direction of one liquid crystal was parallel to the short axis of the support. On the other hand, the verification device was transferred so that the optical axis was inclined by 45 ° with respect to the short axis of the support.

  As shown in FIG. 2, when the latent image device was viewed with the verification device by deforming the support as shown in FIG. 2, a star-shaped image as shown in FIG. 6 appeared. As shown in FIG. 5, the phase difference (33) portion was blocked by light and black, and the phase difference (31) portion reflected light at a wavelength that coincided with the chiral pitch of the cholesteric liquid crystal.

  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. At the phase retarder (33), light having a wavelength matching the chiral pitch of the cholesteric liquid crystal is reflected, and the phase retarder (31) appears 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, 42 ... 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 30: Polarizer 31: Position Phase difference c
32 ... Optical axis of phase difference c 33 ... Phase difference d
34: Optical axis of phase difference element d 35: Phase difference elements arranged in a pattern 36, 37, 39, 40: Polarizer 38: Optical axis of polarizer 39: Phase difference element 41: Optical axis of phase retarder

Claims (6)

  1.   When a flexible support is provided with a latent image device and a verification device on the same or different surfaces of the support, and the verification device is aligned with the latent image device by deforming the support. A forgery prevention medium having flexibility, comprising a latent image device and a verification device in which different images appear depending on whether the same surface of the support faces the same or a different surface.
  2.   2. The medium for preventing forgery having flexibility according to claim 1, wherein the different images have a relationship between negative and positive.
  3.   When the latent image device has a plurality of optical axes and the verification device is a linear polarizer, when the same surface faces each other, the optical axis of one latent image device and the optical axis of the verification device 3. The flexible device according to claim 1, wherein the latent image device and the verification device are arranged so that the optical axis of the other latent image device matches the optical axis of the verification device when different planes face each other. Medium for preventing forgery.
  4.   The latent image device has two regions, a region having right circular polarization and a region having left circular polarization, and the verification device functions as a right circular polarizer from one side, The medium for preventing forgery having flexibility according to claim 1 or 2, which functions as a left circular polarizer from the surface.
  5.   When the latent image device has a plurality of optical axes, and the verification device is a device having a linear polarizer and a phase retarder on both sides, the latent image device has 1 When one optical axis matches the optical axis of the phase retarder on one side of the verification device, and different planes face each other, the other optical axis of the latent image device and the phase retarder on the other side of the verification device 3. The medium for preventing forgery having flexibility according to claim 1 or 2, wherein the latent image device and the verification device are arranged so that the optical axis of each of them coincides.
  6.   An image that appears when the major surface side of the flexible anti-counterfeit medium according to any one of claims 1 to 5 is deformed so that the same surfaces face each other, and the major axis side is deformed. A verification method for performing authenticity determination by causing different images to appear when different surfaces face each other and when the same surface faces each other.
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JP2013064882A (en) * 2011-09-16 2013-04-11 Toppan Printing Co Ltd Information recording medium
WO2014203986A1 (en) * 2013-06-21 2014-12-24 富士フイルム株式会社 Polarization filter and sensor system

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JP2013064882A (en) * 2011-09-16 2013-04-11 Toppan Printing Co Ltd Information recording medium
WO2014203986A1 (en) * 2013-06-21 2014-12-24 富士フイルム株式会社 Polarization filter and sensor system
JP2015004856A (en) * 2013-06-21 2015-01-08 富士フイルム株式会社 Polarization filter and application of the same
US9671540B2 (en) 2013-06-21 2017-06-06 Fujifilm Corporation Polarization filter and sensor system

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