JP4335352B2 - Anti-counterfeit body and forgery discrimination method - Google Patents

Anti-counterfeit body and forgery discrimination method Download PDF

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Publication number
JP4335352B2
JP4335352B2 JP5857599A JP5857599A JP4335352B2 JP 4335352 B2 JP4335352 B2 JP 4335352B2 JP 5857599 A JP5857599 A JP 5857599A JP 5857599 A JP5857599 A JP 5857599A JP 4335352 B2 JP4335352 B2 JP 4335352B2
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Prior art keywords
light
polarized light
circularly polarized
selective reflection
reflection layer
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JP2000255200A (en
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祐美 横山
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大日本印刷株式会社
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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

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a forgery prevention body and a forgery discrimination method for preventing forgery of an object such as a card, a gift certificate, a cash voucher, a ticket, a banknote, a passport, an identification card, a security, or a public competition voting ticket.
[0002]
[Prior art]
Conventionally, as a method of preventing counterfeiting of credit cards, certificates, and vouchers, a method of sticking a forgery prevention body difficult to forge to an anti-counterfeit object and visually or mechanically determining the authenticity is known. ing. Such anti-counterfeit bodies include those using holograms and liquid crystal films.
Holograms include those that visually discriminate characters and pictures as holograms, those that machine recognize numerical codes and specific patterns as holograms, and those that combine both. Holograms have been widely used because they cannot be duplicated by a normal color copying apparatus or the like and are effective in preventing forgery and have high design properties.
As a liquid crystalline film, a method using a cholesteric liquid crystal whose reflection color changes depending on a viewing angle (Japanese Patent Laid-Open No. 63-51193), a method using a nematic liquid crystal having optical anisotropy (Japanese Patent Laid-Open No. 8-43804), etc. Has been proposed. In particular, the method using a cholesteric liquid crystal is an excellent method for preventing forgery because two characteristics of the cholesteric liquid crystal, that is, selective reflection and circular polarization selectivity can be incorporated into one medium as information for authenticity identification. It is.
[0003]
[Problems to be solved by the invention]
However, the above-described conventional holograms have become capable of manufacturing counterfeit products with the recent spread of hologram manufacturing technology, and the effect of preventing forgery is reduced.
Also, the method using cholesteric liquid crystal is difficult to match the color tone, even if you try to make the liquid crystal that reflects left circularly polarized light and the liquid crystal that reflects right circularly polarized light the same color, it will be subtly shifted and uncomfortable. Is produced.
[0004]
An object of the present invention is to provide an anti-counterfeit body and a forgery determination method that are rich in design, difficult to counterfeit, and can be easily determined forgery.
[0005]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
In order to solve the above-mentioned problem, the invention of claim 1 is formed of a base material (11) and a predetermined region of the base material (11), and of incident light, either left circularly polarized light or right circularly polarized light. When the left circularly polarized light is incident on the first light selective reflective layer (12) that reflects only one light and displays the discrimination information, and the first light selective reflective layer (12), the left circular polarized light When the right circular polarized light is emitted after being converted to right circular polarized light, the right circular polarized light is converted into left circular polarized light and emitted, and the phase difference providing layer (13) A second light selective reflection layer (14) that is formed in a predetermined region and reflects the same circularly polarized light as the polarized light reflected by the first light selective reflection layer (12) and displays information that is the same as or different from the discrimination information ; a forgery prevention member having the second light selective reflection layer (14) is paired in the first light selective reflection layer (21) Te is a forgery prevention member, characterized in that it is formed shifted by a predetermined distance so that a portion thereof overlaps when viewed from the thickness direction of the anti-fake material.
[0006]
The invention according to claim 2 is formed on the base material (11) and a predetermined region of the base material (11), and among the incident light, only one of the left circularly polarized light and the right circularly polarized light is reflected and discriminated. Formed on the first light selective reflection layer (12) for displaying information and the first light selective reflection layer (12). When left circularly polarized light is incident, the left circularly polarized light is converted into right circularly polarized light and emitted. When the right circularly polarized light is incident, the right circularly polarized light is converted into the left circularly polarized light and emitted, and formed in a predetermined region of the base material (11) and the first light selection A forgery prevention body having a second light selective reflection layer (14) that reflects the same circularly polarized light as the polarized light reflected by the reflective layer (12) and displays information that is the same as the discrimination information or has parallax , The second light selective reflection layer (14) is seen from the thickness direction of the anti-counterfeit body with respect to the first light selective reflection layer (12). A forgery prevention member, characterized in that it is formed shifted by a predetermined distance.
[0007]
According to a third aspect of the present invention, in the forgery prevention body according to the first or second aspect, the second light selective reflection layer (14) has a liquid crystal phase similar to that of the first light selective reflection layer (12). It is a forgery prevention body characterized by being a layer which has.
[0010]
The invention of claim 4 is a forgery determination method for determining forgery of a forgery prevention body according to any one of claims 1 to 3, wherein either the left circularly polarized light or the right circularly polarized light is detected. When viewed with one eye through the first discriminating unit that transmits only light, and viewed with the other eye through the second discriminating unit that transmits only the other light of left circularly polarized light or right circularly polarized light, It is a forgery discrimination method characterized by discriminating a genuine product when the discrimination information looks three-dimensional and a counterfeit product when it does not look three-dimensional.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a first embodiment of a forgery prevention body according to the present invention. In the figure, (A) is a plan view, and (B) is a cross-sectional view taken along the line BB of (A).
The anti-counterfeit body 10 includes a base material 11, a first light selective reflection layer 12, a phase difference providing layer 13, a second light selective reflection layer 14, and a protective layer 15.
[0012]
The base material 11 is a base material that serves as a carrier for the anti-counterfeit body 10. The substrate 11 is made of paper (for example, fine paper, art paper, coated paper, mirror coated paper, condenser paper, paraffin paper, etc.), plastic film (for example, polyethylene terephthalate (PET), polypropylene (PP), Polyvinyl chloride (PVC), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polyvinyl alcohol (PVA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene copolymer (AS) , Cellulose acetate butyrate (CAB), cellulose propionate (CP), etc.), metals (for example, gold, silver, copper, aluminum, etc.) and the like or composites can be suitably used.
Further, it is desirable that the base material 11 is dark-colored printed so as to absorb the light transmitted through the first light selective reflection layer 12 and the second light selective reflection layer 14 and prevent excessive reflection.
[0013]
The first light selective reflection layer 12 is a layer that reflects only one of the left circularly polarized light and the right circularly polarized light in the incident light. The first light selective reflection layer 12 is formed on the right half of the substrate 11. The first light selective reflection layer 12 displays the letter “N” as discrimination information.
[0014]
The first light selective reflection layer 12 has a cholesteric liquid crystal phase. The average spiral axis orientation of the cholesteric liquid crystal phase is parallel to the film thickness direction. The cholesteric liquid crystal will be described later in detail. The first light selective reflection layer 12 may use any medium that exhibits optically selective reflection and circular polarization selectivity, such as a polymer film in which cholesteric liquid crystal alignment is fixed or a film in which cholesteric liquid crystal particles are dispersed in a carrier. Although it is possible, in particular, a polymer film in which liquid crystal alignment is fixed can be suitably used.
[0015]
An example of such a polymer film is a polymer film in which a low molecular liquid crystal is cholesterically aligned and then the low molecular liquid crystal is crosslinked and fixed by photoreaction or thermal reaction. As another example, a side chain type or main chain type thermotropic polymer liquid crystal was cholesterically aligned in a liquid crystal state and then cooled to a temperature below the liquid crystal transition point to fix the alignment state. A polymer film can be mentioned. Furthermore, a polymer film prepared by fixing the alignment state by gradually removing the solvent after cholesteric alignment of the side chain type or main chain type lyotropic polymer liquid crystal in a solution can also be used.
[0016]
Examples of polymer liquid crystals that can be used in the production of these films include side chain polymers such as polyacrylates, polymethacrylates, polysiloxanes, and polymalonates having a liquid crystal forming group in the side chain, and polyesters having a liquid crystal forming group in the main chain. Main chain polymers such as polyester amide, polycarbonate, polyamide, and polyimide.
[0017]
The first light selective reflection layer 12 is formed by adhering the film to the substrate 11. For this bonding, thermosetting resins (for example, phenol resins, furan resins, urea resins, melamine resins, polyester resins, polyurethane resins, epoxy resins and other resins), thermoplastic resins (for example, Polyvinyl acetate, polyvinyl alcohol, polyvinyl chloride resin, polyvinyl butyral resin, poly (meth) acrylic resin, nitrocellulose, polyamide and other resins), rubber (for example, butadiene-acrylonitrile rubber, neoprene rubber and other rubber), glue, Among natural resins, casein, sodium silicate, dextrin, starch, gum arabic and the like, an adhesive mainly composed of one type or two or more types can be used. These adhesives may be any of a solution type, an emulsion type, a powder type, or a film type. Furthermore, these adhesives may be any of a room temperature solidification type, a solvent volatile solidification type, or a melt solidification type.
[0018]
The phase difference providing layer 13 is a layer that birefrings incident light to generate different phases depending on the polarization direction, thereby providing a phase difference. The phase difference providing layer 13 is formed on the base material 11 and the first light selective reflection layer 12.
Birefringence is a phenomenon that occurs because the refractive index of a medium is not uniform depending on the polarization direction, and the phase difference σ of light transmitted through such a medium is
σ = 2π (n e -n o ) d / λ
n e: extraordinary refractive index n o: ordinary index d: thickness of the medium lambda: the wavelength of light, be given is known. That is, for a medium having a certain thickness d, the phase difference σ depends on the wavelength λ of light.
Phase difference providing layer 13 is incident wavelength λ = 2 (n e -n o ) d becomes right circularly polarized light while transmitting the right-handed circularly polarized light, a phase difference sigma = [pi (i.e., 1/2-wavelength) give. Therefore, the incident right circularly polarized light is converted into left circularly polarized light. Then, the phase difference providing layer 13 emits the left circularly polarized light.
[0019]
The phase difference providing layer 13 can be formed of a plastic film produced in a stretching process. Stretching is a method for producing a film by stretching a plastic at an appropriate temperature not higher than the melting point and not lower than the glass transition point, and includes uniaxial stretching and biaxial stretching depending on the stretching direction. In the present invention, since it is sufficient that the refractive index anisotropy exists, a film produced by any one of the uniaxial stretching method and the biaxial stretching method can be used.
Specifically, the retardation layer 13 is made of cellophane, cellulose, polyester, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), polyvinylidene chloride ( PVDC), polymethyl methacrylate (PMMA), polystyrene (PS), polyethylene terephthalate (PET), nylon and the like can be used to form a stretched film.
[0020]
The phase difference providing layer 13 is formed by adhering the plastic film to the base material 11 and the first light selective reflection layer 12. For this adhesion, an adhesive that adheres the first light selective reflection layer 12 to the substrate 11 may be used.
[0021]
The second light selective reflection layer 14 is a layer that reflects polarized light in the same rotational direction as the polarized light reflected by the first light selective reflective layer 12. The second light selective reflection layer 14 is formed on the phase difference providing layer 13 so as not to overlap the first light selective reflection layer 12. The second light selective reflection layer 14 displays the letter “D” as the discrimination information. The second light selective reflection layer 14 is a layer having the same cholesteric liquid crystal phase as the first light selective reflection layer 12. The second light selective reflection layer 14 is also adhered to the phase difference providing layer 13 by using the adhesive.
[0022]
The protective layer 15 is a layer that protects the surface of the anti-counterfeit body 10. Examples of the material of the protective layer 15 include acrylic resin, urethane resin, epoxy resin, silicon resin, EVA resin, polyamide resin, polyester resin, polystyrene resin, and cellulose resin. It is not limited. The protective layer 15 may be appropriately selected according to the required physical properties required for the surface of the anti-counterfeit body 10 such as light resistance, smoothness, hard coat property, and wear resistance. The protective layer 15 is also adhered to the phase difference providing layer 13 and the second light selective reflection layer 14 using the adhesive.
[0023]
(Description of cholesteric liquid crystal)
The cholesteric liquid crystal has a regular twist so that the alignment structure of the liquid crystal molecules draws a spiral in the film thickness direction. A cholesteric liquid crystal has two optical properties of selective reflection and circular polarization selectivity when the pitch P (the film thickness necessary for rotating liquid crystal molecules by 360 °) and the wavelength λ of incident light are substantially equal. (References: Fundamentals of liquid crystal and display applications, Corona, etc.).
[0024]
Selective reflectivity refers to the property of strongly reflecting light within a specific wavelength band of incident light. Since the selective reflectivity is limited and expressed within a specific wavelength band, the reflected light becomes a chromatic color with high color purity by appropriately selecting the pitch P of the cholesteric liquid crystal. Λs the center wavelength of the band, if the bandwidth [Delta] [lambda], these are the pitch P of the optical medium (= λ / n m) and the average refractive index n m (= √ ((n e 2 + n o 2) / 2)) is determined as shown in equations (1) and (2). Here, [Delta] n is the difference between the extraordinary ray refractive index n e and ordinary index n o in the plane of the optical medium (Δn = n e -n o) .
λs = n m · P (1)
Δλ = Δn · P / n m (2)
[0025]
The center wavelength λs and the wavelength bandwidth Δλ shown in the expressions (1) and (2) are defined when the incident light to the cholesteric liquid crystal layer is perpendicularly incident (0 ° incidence, on-axis incidence). When the light is obliquely incident (off-axis incident), the pitch P apparently decreases, so the center wavelength λs shifts to the short wavelength side, and the bandwidth Δλ decreases. This phenomenon is called blue shift because λs shifts to the short wavelength side, and the shift amount depends on the incident angle, but can be easily identified by visual observation. For example, the reflected color of a cholesteric liquid crystal that is colored red when viewed from the vertical (0 ° incidence position) changes in order of orange, yellow, green, blue-green, and blue as the viewing angle increases. Observed.
[0026]
The circularly polarized light selectivity means a property of transmitting only circularly polarized light in a specific rotation direction and reflecting circularly polarized light having the opposite rotation direction. Of the incident light, the circularly polarized light component in the same direction as the twist direction of the alignment structure of the cholesteric liquid crystal is reflected, and the rotational direction of the reflected light is also the same direction, while the circularly polarized light component rotating in the opposite direction is transmitted. Is a unique property unique to cholesteric liquid crystals. In the case of a cholesteric liquid crystal having a left twisted structure, the left circularly polarized light is reflected, the reflected light remains as the left circularly polarized light, and the right circularly polarized light is transmitted.
[0027]
FIG. 2 is a schematic diagram showing how light travels when a forgery prevention body is applied with a discriminator that transmits only left circularly polarized light.
The first light selective reflection layer 12 and the second light selective reflection layer 14 of the anti-counterfeit body 10 are layers that reflect only the left circularly polarized light in the incident light.
The discriminator 30 is a combination of a so-called quarter-wave plate 30a that converts circularly polarized light into linearly polarized light and a polarizing plate 30b that transmits only light in a specific polarization direction.
[0028]
(1) When the natural light 50 passes through the protective layer 15 and reaches the second light selective reflection layer 14, the left circularly polarized light 51L of the natural light 50 is reflected. The right circularly polarized light 51 </ b> R passes through the second light selective reflection layer 14 and the phase difference providing layer 13 and is absorbed by the base material 11.
(2) In (1), the reflected left circularly polarized light 51 </ b> L is transmitted through the quarter wavelength plate 30 a of the discriminator 30 and converted into linearly polarized light 52.
(3) In (2), the converted linearly polarized light 52 coincides with the polarization direction of the polarizing plate 30b and passes through the polarizing plate 30b.
[0029]
(4) On the other hand, when the natural light 50 passes through the protective layer 15 and the phase difference providing layer 13 and reaches the first light selective reflection layer 12, the left circularly polarized light 54L of the natural light 50 is reflected. The right circularly polarized light 54 </ b> R passes through the first light selective reflection layer 12 and is absorbed by the base material 11.
(5) In (4), the reflected left circularly polarized light 54L passes through the phase difference providing layer 13 and is converted to right circularly polarized light 55R.
(6) In (5), the converted right circularly polarized light 55 </ b> R passes through the quarter wavelength plate 30 a of the discriminator 30 and is converted to linearly polarized light 56. The linearly polarized light 56 is 90 degrees different in polarization direction from the linearly polarized light 52.
(7) In (6), the converted linearly polarized light 56 is different from the polarization direction of the polarizing plate 30b and cannot pass through the polarizing plate 30b.
[0030]
(how to use)
FIG. 3 is a diagram for explaining how to use the first embodiment of the forgery prevention body according to the present invention.
(1) The user visually checks the anti-counterfeit body 10.
At this time, the user can confirm the letter “D” displayed on the second light selective reflection layer 14 and the letter “N” displayed on the first light selective reflection layer 12 (FIG. )).
[0031]
(2) In (1), the user who has confirmed the letters “D” and “N” visually confirms the forgery prevention body 10 through a discriminator that transmits only the left circularly polarized light.
At this time, the user can confirm only the letter “D” displayed on the second light selective reflection layer 14, and the letter “N” displayed on the first light selective reflection layer 12 disappears. Visual confirmation is not possible (Figure (B)).
[0032]
(3) In (2), the user who confirms with the discriminator that transmits only the left circularly polarized light visually checks the forgery prevention body 10 through the discriminator that transmits only the right circularly polarized light.
At this time, the user can confirm only the letter “N” displayed on the first light selective reflection layer 12, and the letter “D” displayed on the second light selective reflection layer 14 disappears. Visual confirmation is not possible (Figure (C)).
From the above, the user can determine that the forgery prevention body 10 is genuine.
[0033]
According to the present embodiment, the first light selective reflection layer 12 and the second light selective reflection layer 14 only reflect specific circularly polarized light. Forgery can be determined.
Moreover, since the 1st light selective reflection layer 12 and the 2nd light selective reflection layer 14 have a cholesteric liquid crystal phase, a color change arises according to the viewing angle, and it is excellent in design property.
Further, since the phase difference providing layer 13 converts the right circularly polarized light into left circularly polarized light and the left circularly polarized light into right circularly polarized light, when the first light selective reflection layer 12 and the second light selective reflection layer 14 are provided, The apparent reflection characteristics of the first light selective reflection layer 12 and the second light selective reflection layer 14 can be changed.
[0034]
(Second Embodiment)
FIG. 4 is a diagram showing a second embodiment of the forgery prevention body according to the present invention. In the figure, (A) is a plan view, and (B) is a cross-sectional view taken along the line BB of (A).
In each embodiment described below, parts having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted as appropriate.
The anti-counterfeit body 10 is formed so as to be shifted by a predetermined distance from the base material 11, the first light selective reflection layer 12, the phase difference providing layer 13, and the first light selective reflection layer 12. A two-light selective reflection layer 14 and a protective layer 15 are provided.
The first light selective reflection layer 12 displays a cylinder as discrimination information.
The second light selective reflection layer 14 displays a cylinder having the same shape, color, etc., shifted from the cylinder displayed by the first light selective reflection layer 12 by a predetermined distance.
[0035]
(how to use)
(1) The user visually checks the anti-counterfeit body 10.
At this time, since the discrimination information displayed on the first light selective reflection layer 12 and the discrimination information displayed on the second light selective reflection layer 14 are the same color, the user cannot distinguish the discrimination information. I do not know what is displayed.
(2) In (1), the user who visually confirms the anti-counterfeit body 10 visually confirms the anti-counterfeit body 10 through a glasses-type three-dimensional discrimination tool.
This three-dimensional discrimination tool includes a first discrimination unit that combines a so-called quarter-wave plate and a polarizing plate that transmits only light in a specific polarization direction, and transmits only left-handed circularly polarized light. The right eye includes a second discriminating unit that combines a so-called quarter-wave plate and a polarizing plate that transmits only light having a polarization direction different by 90 degrees with respect to the polarizing plate of the first discriminating unit, Only right circularly polarized light is transmitted.
At this time, the user can check only the image displayed on the second light selective reflection layer 14 with the left eye, and can check only the image displayed on the first light selective reflection layer 12 with the right eye. Can do.
For this reason, the user can confirm the discrimination information three-dimensionally based on the principle of stereoscopic photography.
[0036]
According to the present embodiment, the second light selective reflection layer 14 displays the same discrimination information as the discrimination information of the first light selective reflection layer 12 while being shifted by a predetermined distance. Forgery discrimination can be easily performed based on whether or not the discrimination information can be confirmed three-dimensionally.
Moreover, since the 2nd light selective reflection layer 14 is the same color as the 1st light selective reflection layer 12, if there is no discriminating tool, what is displayed is not known, and its secrecy is high.
[0037]
(Third embodiment)
FIG. 5 is a diagram showing a third embodiment of the forgery prevention body according to the present invention. In the figure, (A) is a plan view, and (B) is a cross-sectional view taken along the line BB of (A).
The anti-counterfeit body 10 is predetermined for the base material 11, the first light selective reflection layer 12, the phase difference providing layer 13 formed in the first light selective reflection layer 12, and the first light selective reflection layer 12. It has the 2nd light selective reflection layer 14 formed in the base material 11, shifted | deviated only by distance.
The first light selective reflection layer 12 displays a quadrangular prism as discrimination information.
The phase difference providing layer 13 is formed on the first light selective reflection layer 12.
The second light selective reflection layer 14 displays a quadrangular column having the same shape, color, etc. with a predetermined distance from the quadrangular column displayed by the first light selective reflection layer 12.
[0038]
According to the present embodiment, since the second light selective reflection layer 14 is formed on the base material 11 similarly to the first light selective reflection layer 12, the first light selective reflection layer 12 and the second light selective reflection are formed. The layer 14 can be formed simultaneously and the productivity is good.
[0039]
(Fourth embodiment)
FIG. 6 is a diagram showing a fourth embodiment of the forgery prevention body according to the present invention. In the figure, (A) is a plan view, and (B) is a cross-sectional view taken along the line BB of (A).
The anti-counterfeit body 10 includes a base material 11, a light selective reflection layer 12 formed by printing on the base material 11, and a phase difference providing layer 13 formed at a predetermined position of the light selective reflection layer 12.
The light selective reflection layer 12 is printed by a printing method such as gravure printing, silk screen printing, intaglio printing, letterpress printing, and ink jet printing using an ink in which cholesteric liquid crystal particles are dispersed.
The phase difference providing layer 13 forms a barcode.
[0040]
According to the present embodiment, the light selective reflection layer 12 is formed by printing, so that mass productivity is good.
Moreover, since the light selective reflection layer 12 can be uniformly printed and formed without dividing it into a plurality of locations, the productivity is good.
Furthermore, since the phase difference providing layer 13 forms a barcode, it can be mechanically forged using a barcode reader that irradiates circularly polarized light.
[0041]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, in the first to third embodiments, the light selective reflection layer may be printed and formed.
In the fourth embodiment, the light selective reflection layer may be formed of a film.
Furthermore, as the base material 11, a card (for example, cash card, credit card, ID certificate, etc.), securities (for example, a gold certificate, gift certificate, gift certificate, stock certificate, etc.), commuter pass, prepaid card, passport, admission ticket, etc. And a light selective reflection layer or the like may be provided on a part thereof.
Furthermore, an adhesive layer may be provided on the substrate 11 and attached to the card or the like.
[0042]
【The invention's effect】
As described above in detail, according to the present invention, the first light selective reflection layer 12 and the second light selective reflection layer 14 only reflect specific circularly polarized light. If it sees, forgery discrimination can be performed easily.
Further, since the phase difference providing layer 13 converts the right circularly polarized light into left circularly polarized light and the left circularly polarized light into right circularly polarized light, the apparent reflection characteristics of the first light selective reflection layer 12 and the second light selective reflection layer 14. Can be changed.
[0043]
According to the present invention, the second light selective reflection layer is formed on the substrate in the same manner as the first light selective reflection layer, so the first light selective reflection layer and the second light selective reflection layer are formed simultaneously. be able to.
[0044]
According to the present invention, the second light selective reflection layer displays the discrimination information that is the same as or different from the discrimination information displayed by the first light selective reflection layer. appear.
[0047]
According to the present invention, forgery determination is performed based on whether or not the determination information looks three-dimensional using a determination tool, so that forgery determination can be easily performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a forgery prevention body according to the present invention.
FIG. 2 is a schematic diagram showing how light travels when a forgery prevention body is applied with a discriminator that transmits only left-handed circularly polarized light.
FIG. 3 is a diagram illustrating a method of using the first embodiment of the forgery prevention body according to the present invention.
FIG. 4 is a diagram showing a second embodiment of the forgery prevention body according to the present invention.
FIG. 5 is a diagram showing a third embodiment of the forgery prevention body according to the present invention.
FIG. 6 is a diagram showing a fourth embodiment of the forgery prevention body according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Counterfeit prevention body 11 Base material 12 1st light selective reflection layer 13 Phase difference providing layer 14 2nd light selective reflection layer 15 Protective layer 30 Discriminating tool 30a 1/4 wavelength plate 30b Polarizing plate

Claims (4)

  1. A substrate;
    A first light selective reflection layer that is formed in a predetermined region of the substrate and reflects only one of the left circularly polarized light and the right circularly polarized light among the incident light, and displays discrimination information ;
    Formed in the first light selective reflection layer, when left circularly polarized light is incident, the left circularly polarized light is converted into right circularly polarized light and emitted; when right circularly polarized light is incident, the right circularly polarized light is left A phase difference-imparting layer that is converted into circularly polarized light and is emitted;
    A second light selective reflection layer that is formed in a predetermined region of the phase difference providing layer, reflects the same circularly polarized light as the polarized light reflected by the first light selective reflection layer, and displays information that is the same as or different from the discrimination information a forgery prevention having bets,
    The second light selective reflection layer is formed to be shifted from the first light selective reflection layer by a predetermined distance so that a part of the second light selective reflection layer overlaps when viewed from the thickness direction of the anti-counterfeit body.
    Anti-counterfeit body characterized by.
  2. A substrate;
    A first light selective reflection layer that is formed in a predetermined region of the substrate and reflects only one of the left circularly polarized light and the right circularly polarized light among the incident light, and displays discrimination information ;
    Formed in the first light selective reflection layer, when left circularly polarized light is incident, the left circularly polarized light is converted into right circularly polarized light and emitted; when right circularly polarized light is incident, the right circularly polarized light is left A phase difference-imparting layer that is converted into circularly polarized light and is emitted;
    A second light selective reflection layer that is formed in a predetermined region of the base material and reflects the same circularly polarized light as the polarized light reflected by the first light selective reflection layer and displays information that is the same as or different from the discrimination information ; a forgery prevention member having,
    The second light selective reflection layer is formed to be shifted from the first light selective reflection layer by a predetermined distance when viewed from the thickness direction of the anti-counterfeit body.
    Anti-counterfeit body characterized by.
  3. In the anti-counterfeit body according to claim 1 or 2,
    The second light selective reflection layer is a layer having a liquid crystal phase similar to that of the first light selective reflection layer.
    A forgery prevention body characterized by that.
  4. A forgery determination method for performing forgery determination of an anti-counterfeit body according to any one of claims 1 to 3 ,
    Seeing with one eye through the first discriminating unit that transmits only one of the left circularly polarized light and the right circularly polarized light,
    When viewed with the other eye through the second discriminating unit that transmits only the other light of the left circularly polarized light or the right circularly polarized light,
    A forgery discrimination method characterized by discriminating a genuine product when the discrimination information looks three-dimensional and a counterfeit product when the discrimination information does not look three-dimensional.
JP5857599A 1999-03-05 1999-03-05 Anti-counterfeit body and forgery discrimination method Expired - Lifetime JP4335352B2 (en)

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