JP2000255200A - Anti-counterfeiting body and counterfeit discrimination method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a forgery prevention body and a forgery discrimination method which are rich in design, are difficult to forge, and can be easily forged. SOLUTION: A base material 11, a first light selective reflection layer 12 formed in a predetermined region of the base material 11, and reflecting only one of left circularly polarized light and right circularly polarized light among incident light, Formed on the first light selective reflection layer 12, when left circularly polarized light is incident, the left circularly polarized light is converted to right circularly polarized light and emitted, and when right circularly polarized light is incident, the right circularly polarized light is converted to left circularly polarized light. A phase difference providing layer 13 which converts the light into circularly polarized light and emits the same; and a second light selective reflection formed in a predetermined area of the phase difference providing layer 13 and reflecting the same circularly polarized light as the polarized light reflected by the first light selective reflection layer 12. And a layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a card, a gift certificate,
The present invention relates to an anti-counterfeiting body for preventing counterfeiting of an object such as a cash voucher, a ticket, a bill, a passport, an identification card, a security, a public voting ticket, and a forgery discrimination method.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing forgery of credit cards, certificates, and vouchers, a forgery-preventing body that is difficult to forge is attached to a forgery-preventing object, and the authenticity is visually or mechanically determined. There are known ways to do this. Such anti-counterfeiting bodies include those using a hologram or a liquid crystal film. The hologram includes a hologram that visually recognizes a character or a picture as a hologram, a numerical code or a specific pattern that is mechanically recognized as a hologram, and a combination of the two. Holograms have become widespread 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 crystal film, a method using a cholesteric liquid crystal whose reflection color changes depending on the viewing angle (Japanese Patent Laid-Open No.
3-51193) and a method using a nematic liquid crystal having optical anisotropy (Japanese Patent Application Laid-Open No. 8-43804). In particular, the method using a cholesteric liquid crystal can incorporate the two characteristics of the cholesteric liquid crystal, ie, the selective reflection property and the circular polarization selectivity, into one medium as information for authenticity discrimination. It is.

[0003]

However, with the conventional holograms described above, counterfeit products can be manufactured with the spread of hologram manufacturing technology in recent years, and the counterfeit prevention effect is reduced. Also, in the method using cholesteric liquid crystal, it is difficult to adjust the color tone even if the liquid crystal that reflects left circularly polarized light and the liquid crystal that reflects right circularly polarized light have the same color. Is generated.

[0004] It is an object of the present invention to provide a forgery prevention body and a forgery discrimination method which are rich in design, are difficult to forge, and can be easily forged.

[0005]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. In order to solve the above problem, the invention according to claim 1 includes a substrate (1)
1) a first light selective reflection layer (12) formed on a predetermined region of the base material (11) and reflecting only one of left circularly polarized light and right circularly polarized light among incident light; When the left circularly polarized light is formed on the one light selective reflection layer (12),
A phase difference providing layer (13) that converts the left circularly polarized light into right circularly polarized light, emits the right circularly polarized light, and converts the right circularly polarized light into left circularly polarized light and emits the same; Layer (13)
And a second light selective reflection layer (14) that reflects the same circularly polarized light as the first light selective reflection layer (12) reflects.

According to a second aspect of the present invention, only one of the left circularly polarized light and the right circularly polarized light of the incident light is formed on the substrate (11) and the predetermined region of the substrate (11). A first light selective reflection layer (12) and a first light selective reflection layer (12)
When left circularly polarized light is incident, the left circularly polarized light is converted to right circularly polarized light and emitted, and when right circularly polarized light is incident, the right circularly polarized light is converted to left circularly polarized light and emitted. And a second light selective reflection layer (14) formed in a predetermined area of the substrate (11) and reflecting the same circularly polarized light as the first light selective reflection layer (12) reflects. )).

[0007] The third aspect of the present invention is the first or second aspect.
In the forgery preventive body described in 1 above, the first light selective reflection layer (1)
2) displaying discrimination information, and a second light selective reflection layer (14).
Is an anti-counterfeit body that displays information that is the same as or has parallax with the discrimination information.

According to a fourth aspect of the present invention, there is provided a substrate (11), and a light selection member formed on the substrate (11) and reflecting only one of left circularly polarized light and right circularly polarized light among incident light. When the left circularly polarized light is incident on the reflection layer (12) and a predetermined area of the light selective reflection layer (12), the left circularly polarized light is converted into the right circularly polarized light, and the right circularly polarized light is emitted. In this case, the anti-counterfeit body has a phase difference providing layer (13) that converts the right circularly polarized light into left circularly polarized light and emits the same.

[0009] The invention of claim 5 is the invention of claims 1 to 4.
A forgery discrimination method for discriminating a forgery of an anti-counterfeit body according to any one of the above items, wherein a discriminator (30) that transmits only one of left circularly polarized light and right circularly polarized light is applied. If there is an area that disappears and cannot be visually checked,
This is a forgery discrimination method characterized in that when there is no area that is genuine and disappears and cannot be visually checked, it is determined to be a counterfeit.

The invention of claim 6 is a forgery discrimination method for discriminating forgery of an anti-counterfeiting body according to claim 3, wherein the first countermeasure that transmits only one of the left circularly polarized light and the right circularly polarized light is used.
Through the discriminating unit, when viewed with one eye, through the second discriminating unit that transmits only the other light of either left circularly polarized light or right circularly polarized light, when viewed with the other eye, the discrimination information becomes three-dimensional. This is a forgery discrimination method characterized by discriminating a genuine product when it can be seen and a fake product when it cannot be seen three-dimensionally.

[0011]

Embodiments of the present invention will be described below in more detail with reference to the drawings. (First Embodiment) FIG. 1 is a view showing a first embodiment of a forgery prevention body according to the present invention. In the figure, (A) is a plan view,
(B) is a BB cross-sectional view of (A). Anti-counterfeiting body 1
No. 0 has 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.

The base material 11 is a base material serving as a carrier of the forgery preventive body 10. The base material 11 is made of paper (for example, high-quality paper, art paper, coated paper, mirror-coated paper,
Condenser paper, paraffin paper, etc.), plastic film (for example, polyethylene terephthalate (PE)
T), polypropylene (PP), polyvinyl chloride (PV)
C), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polyvinyl alcohol (PVA), acrylonitrile / butadiene / styrene copolymer (ABS), acrylonitrile / styrene copolymer (AS), cellulose acetate butyrate Rate (CAB), cellulose propionate (CP), etc.), metal (eg, gold, silver, copper, aluminum, etc.)
A simple substance or a composite such as described above can be suitably used. Further, it is desirable that the base material 11 be subjected to dark printing so as to absorb light transmitted through the first light selective reflection layer 12 and the second light selective reflection layer 14 and prevent unnecessary reflection.

The first light selective reflection layer 12 is a layer that reflects only one of left circularly polarized light and right circularly polarized light among 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 character “N” as the discrimination information.

The first light selective reflection layer 12 has a cholesteric liquid crystal phase. The average helical axis direction 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 optical 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 possible, a polymer film having a fixed liquid crystal orientation can be suitably used.

As an example of such a polymer film,
After the cholesteric orientation of the low-molecular liquid crystal, a polymer film in which the low-molecular liquid crystal is cross-linked by a photoreaction or a thermal reaction to fix the orientation thereof can be used. Further, 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 lower than the liquid crystal transition point to fix the alignment state. Polymer films can be given. Furthermore, a polymer film produced by performing cholesteric alignment of a side chain type or main chain type lyotropic polymer liquid crystal in a solution and then gradually removing the solvent to fix the alignment state can be used.

Examples of the polymer liquid crystal which can be used for preparing these films include side-chain polymers such as polyacrylates, polymethacrylates, polysiloxanes and polymalonates having a liquid crystal-forming group in the side chain, and liquid crystal-forming groups in the main chain. And main chain polymers such as polyesters, polyesteramides, polycarbonates, polyamides, and polyimides.

The first light selective reflection layer 12 is formed by bonding the above-mentioned film to the substrate 11. For this bonding, a thermosetting resin (for example, a phenol resin, a furan resin, a urea resin, a melamine resin, a polyester resin, a polyurethane resin, an epoxy resin, or another resin), a thermoplastic resin (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, neobrene rubber and other rubbers),
Adhesives containing one or more of glue, natural resin, casein, sodium silicate, dextrin, starch, gum arabic and the like can be used. These adhesives may be of a solution type, an emulsion type, a powder type or a film type. further,
These adhesives may be any of a room temperature solidification type, a solvent volatilization type, and a fusion solidification type.

The phase difference imparting layer 13 is a layer that birefringes incident light to generate different phases depending on the polarization direction, thereby imparting 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
This is a phenomenon that occurs because the refractive index of the medium is not uniform depending on the polarization direction, and the phase difference σ of the 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, it is 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, the wavelength λ = 2 (n _e -n
_o ) When the right circularly polarized light of d is incident, a phase difference σ = π (that is, 波長 wavelength) is given while transmitting the right circularly polarized light. 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.

The phase difference providing layer 13 can be formed of a plastic film produced in a stretching step. Stretching is a method for producing a film by stretching a plastic at an appropriate temperature from the melting point to the glass transition point or more, and includes uniaxial stretching and biaxial stretching depending on the stretching direction. In the present invention, a film produced by any of uniaxial stretching and biaxial stretching can be used as long as it has a refractive index anisotropy. Specifically, the retardation providing 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), or a stretched film made of nylon or the like.

The phase difference providing layer 13 is made of the plastic
The film is formed by adhering to the substrate 11 and the first light selective reflection layer 12. For this bonding, an adhesive for bonding the first light selective reflection layer 12 to the substrate 11 may be used.

The second light selective reflection layer 14 is a layer that reflects polarized light in the same rotation direction as the polarized light reflected by the first light selective reflection layer 12. The second light selective reflection layer 14 includes the retardation layer 13
It is formed above and at a position that does not overlap with the first light selective reflection layer 12. The second light selective reflection layer 14 displays the character “D” as the discrimination information. 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 bonded to the retardation layer 13 using the above-mentioned adhesive.

The protective layer 15 is a layer that protects the surface of the anti-counterfeit body 10. The protective layer 15 is made of acrylic resin, urethane resin, epoxy resin, silicon resin,
A single product or a mixture of an EVA resin, a polyamide resin, a polyester resin, a polystyrene resin, a cellulose resin and the like can be exemplified, but the invention is not limited thereto. The protective layer 15 may be appropriately selected depending on the required physical properties such as light resistance, smoothness, hard coat properties, and abrasion resistance required on the surface of the forgery prevention body 10 according to the application.
The protective layer 15 is also formed using the above-mentioned adhesive,
And adhere to the second light selective reflection layer 14.

(Explanation of Cholesteric Liquid Crystal) Cholesteric liquid crystal has a regular twist so that the alignment structure of liquid crystal molecules draws a spiral in the film thickness direction. The cholesteric liquid crystal has two optical properties of selective reflection and circular polarization selectivity when the pitch P (the film thickness required for liquid crystal molecules to rotate 360 °) and the wavelength λ of incident light are almost equal. (References: Fundamentals of liquid crystal and display applications, Corona, etc.).

The term "selective reflection" refers to the property of strongly reflecting light within a specific wavelength band among incident light. Since this selective reflectivity is expressed only within a specific wavelength band,
By appropriately selecting the pitch P of the cholesteric liquid crystal, the reflected light becomes a chromatic color with high color purity. Assuming that the center wavelength of the band is λs and the bandwidth is Δλ, these are the pitch P (= λ / _nm ) of the optical medium and the average refractive index _nm (=
^{_{√ ((n e 2 + n}} o 2) / 2)) by equation (1),
Determined as in (2). Here, [Delta] n is the difference in the extraordinary ray refractive index n _e and ordinary index n _o in the plane of the optical medium ([Delta] n
= N _e -n _o) to. λs = n _m · P (1) Δλ = Δn · P / _nm (2)

The center wavelength λs and the wavelength bandwidth Δλ shown in the equations (1) and (2) are defined when the light incident on the cholesteric liquid crystal layer is vertically incident (0 ° incident, on-axis incident). However, the incident light is obliquely incident (off-a
xi incident), the pitch P apparently decreases, so that the center wavelength λs shifts to the shorter wavelength side and the bandwidth Δ
λ decreases. This phenomenon is called blue shift because λs shifts to the shorter wavelength side, and the shift amount depends on the incident angle, but can be easily identified by visual observation.
For example, the reflection color of a cholesteric liquid crystal that becomes red when viewed from the vertical (0 ° incident position) changes sequentially from orange, yellow, green, blue-green, and blue as the viewing angle increases. To be observed.

Circularly polarized light selectivity refers to the property of transmitting only circularly polarized light in a specific rotation direction and reflecting circularly polarized light in the opposite rotation direction. Of the incident light, a circularly polarized component in the same direction as the twist direction of the alignment structure of the cholesteric liquid crystal is reflected,
The direction of rotation of the reflected light is the same, while the point of transmission of the circularly polarized light component rotating in the opposite direction is a unique property unique to cholesteric liquid crystals. In the case of a cholesteric liquid crystal having a left-handed structure, left circularly polarized light is reflected, the reflected light is left circularly polarized light, and right circularly polarized light is transmitted.

FIG. 2 is a schematic diagram showing how light travels when a discriminator that transmits only left-handed circularly polarized light is applied to the anti-counterfeit body. The first light selective reflection layer 12 and the second light selective reflection layer 14 of the forgery prevention body 10 are layers that reflect only left-handed 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.

(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. Right circular polarized light 51R
Is transmitted through the second light selective reflection layer 14 and the phase difference providing layer 13 and is absorbed by the substrate 11. (2) In (1), the reflected left circularly polarized light 51L is transmitted through the 板 wavelength plate 30a of the discriminator 30, and becomes linearly polarized light 5L.
Converted to 2. (3) In (2), the converted linearly polarized light 52 matches the polarization direction of the polarizing plate 30b and passes through the polarizing plate 30b.

(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 54R 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 into right circularly polarized light 55R. (6) In (5), the converted right circularly polarized light 55R is
The light passes through the 波長 wavelength plate 30 a of the discriminator 30 and is converted into linearly polarized light 56. This linearly polarized light 56 has a polarization direction of
It differs by 90 degrees 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.

(Method of Use) FIG. 3 is a diagram for explaining a method of using the first embodiment of the forgery preventive body according to the present invention. (1) The user visually checks the forgery prevention 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. )).

(2) In (1), the user who has confirmed the letters "D" and "N" visually checks the forgery preventive body 10 through a discriminator that transmits only left circularly polarized light. At this time, the user can check only the character “D” displayed on the second light selective reflection layer 14, and the character “N” displayed on the first light selective reflection layer 12 disappears. Visual confirmation becomes impossible (FIG. (B)).

(3) In (2), the user who has confirmed with the discriminator that transmits only left circularly polarized light visually checks the forgery prevention body 10 through the discriminator that transmits only right circularly polarized light. At this time, the user can confirm only the character “N” displayed on the first light selective reflection layer 12, and the character “D” displayed on the second light selective reflection layer 14 disappears. Visual confirmation is no longer possible (Fig. (C)). As described above, the user can determine that the forgery prevention body 10 is genuine.

According to this embodiment, the first light selective reflection layer 1
Since the second and second light selective reflection layers 14 reflect only specific circularly polarized light, if the reflected light is viewed using a discriminator,
It is easy to determine forgery. Further, since the first light selective reflection layer 12 and the second light selective reflection layer 14 have a cholesteric liquid crystal phase, they change color depending on the viewing angle, and are excellent in design. Further, since the phase difference providing layer 13 converts right circularly polarized light into left circularly polarized light and left circularly polarized light into right circularly polarized light, when provided in the first light selective reflection layer 12 and the second light selective reflection layer 14, The apparent reflection characteristics of the first light selective reflection layer 12 and the second light selective reflection layer 14 can be changed.

(Second Embodiment) FIG. 4 is a view showing a second embodiment of a forgery prevention body according to the present invention. In the figure, (A)
Is a plan view, and (B) is a BB cross-sectional view of (A).
In the following embodiments, portions that perform the same functions as those in the above-described first embodiment will be denoted by the same reference numerals, and redundant description will be omitted as appropriate. The anti-counterfeit body 10 is
Base material 11, first light selective reflection layer 12, and retardation providing layer 1
3, a second light selective reflection layer 14 formed so as to be shifted by a predetermined distance with respect to the first light selective reflection layer 12, and
And a protective layer 15. The first light selective reflection layer 12 displays a cylinder as discrimination information. Second light selective reflection layer 14
Displays a column having the same shape, color, and the like shifted by a predetermined distance from the column displayed by the first light selective reflection layer 12.

(Method of Use) (1) The user visually confirms the forgery prevention body 10. At this time, the user cannot distinguish between 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 because they have the same color. , Do not know what is displayed. (2) In (1), the user who visually confirms the forgery prevention body 10 visually confirms the forgery prevention body 10 through a glasses-type three-dimensional discriminator. This three-dimensional discriminator includes a first discriminating unit in which a so-called quarter-wave plate and a polarizing plate that transmits only light in a specific polarization direction are combined with the left eye, and transmits only left circularly polarized light. In addition, the so-called ４
A second combination of a wavelength plate and a polarizing plate that transmits only light having a polarization direction different by 90 degrees from the polarizing plate of the first determination unit.
A discriminator is provided, and 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 check only the image displayed on the first light selective reflection layer 12 with the right eye. Can be. For this reason, the user can check the discrimination information three-dimensionally according to the principle of the three-dimensional photograph.

According to the present embodiment, the second light selective reflection layer 1
4 displays the same discrimination information as the discrimination information of the first light selective reflection layer 12 by a predetermined distance, so that the discrimination tool can be used to determine whether the discrimination information can be three-dimensionally checked. It is easy to determine forgery. Further, since the second light selective reflection layer 14 has the same color as the first light selective reflection layer 12,
Without the discriminator, it is difficult to know what is being displayed, and the confidentiality is high.

(Third Embodiment) FIG. 5 is a view showing a third embodiment of a forgery preventive body according to the present invention. In the figure, (A)
Is a plan view, and (B) is a BB cross-sectional view of (A).
The anti-counterfeit body 10 includes a base material 11 and a first light selective reflection layer 12.
And the phase difference providing layer 1 formed on the first light selective reflection layer 12
3 and a second light selective reflection layer 14 formed on the substrate 11 so as to be shifted by a predetermined distance from the first light selective reflection layer 12. The first light selective reflection layer 12 displays a quadratic prism as the 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 has a shape and a shape corresponding to the rectangular prism displayed by the first light selective reflection layer 12.
The square pillars having the same color and the like are displayed by being shifted by a predetermined distance.

According to the present embodiment, the second light selective reflection layer 1
4, the first light selective reflection layer 12 and the second light selective reflection layer 14 can be formed at the same time since the first light selective reflection layer 12 is formed on the base material 11 similarly to the first light selective reflection layer 12, and the productivity is improved. Good.

(Fourth Embodiment) FIG. 6 is a view showing a fourth embodiment of a forgery prevention body according to the present invention. In the figure, (A)
Is a plan view, and (B) is a BB cross-sectional view of (A).
The forgery prevention body 10 has 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 formed by gravure printing, silk screen printing, and ink using ink in which cholesteric liquid crystal particles are dispersed.
Printing is performed by a printing method such as intaglio printing, letterpress printing, or an inkjet method. The phase difference providing layer 13 forms a bar code.

According to the present embodiment, the light selective reflection layer 12
Is mass-produced because it is formed by printing. Further, the light selective reflection layer 12 can be uniformly formed without being divided into a plurality of portions.
Since it can be formed by printing, productivity is good. Further, since the phase difference providing layer 13 forms a barcode, forgery can be mechanically discriminated using a barcode reader that irradiates circularly polarized light.

(Modifications) Various modifications and changes are possible without being limited to the above-described embodiment, 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 formed by printing. Further, in the fourth embodiment, the light selective reflection layer may be formed of a film. Further, as the base material 11,
Using a card (for example, cash card, credit card, ID card, etc.), securities (for example, cash voucher, gift certificate, gift certificate, stock certificate, etc.), commuter pass, prepaid card, passport, admission ticket, etc. The portion may be provided with a light selective reflection layer or the like. Furthermore, an adhesive layer may be provided on the base material 11 and attached to the card or the like.

[0042]

As described in detail above, according to the first aspect of the present invention, the first light selective reflection layer 12 and the second light selective reflection layer 14 reflect only specific circularly polarized light. If it is used and the reflected light is observed, it is possible to easily determine forgery. Further, since the phase difference providing layer 13 converts right circularly polarized light to left circularly polarized light and left circularly polarized light to 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.

According to the second aspect of the present invention, since the second light selective reflection layer is formed on the substrate similarly to the first light selective reflection layer, the first light selective reflection layer and the second light selective reflection layer are formed. The reflection layer can be formed at the same time.

According to the third aspect of the present invention, the second light selective reflection layer displays the same or parallaxed discrimination information as the discrimination information displayed by the first light selective reflection layer. The discrimination information looks three-dimensional.

According to the fourth aspect of the present invention, the light selective reflection layer can be formed uniformly without being divided into a plurality of portions, so that the productivity is good.

According to the fifth aspect of the present invention, forgery determination is performed by using the determination tool based on whether or not there is an area that disappears and cannot be visually checked. Therefore, forgery determination can be easily performed.

According to the sixth aspect of the present invention, forgery determination is performed by using the determination tool based on whether or not the determination information looks three-dimensional, so that forgery determination can be easily performed.

[Brief description of the drawings]

FIG. 1 is a view 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 discriminator that transmits only left circularly polarized light is applied to the forgery prevention body.

FIG. 3 is a view for explaining a method of using the forgery prevention body according to the first embodiment of the present invention.

FIG. 4 is a view showing a second embodiment of a forgery prevention body according to the present invention.

FIG. 5 is a view showing a third embodiment of a forgery preventive body according to the present invention.

FIG. 6 is a view showing a fourth embodiment of a forgery prevention body according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Forgery prevention body 11 Substrate 12 1st light selective reflection layer 13 Phase difference providing layer 14 2nd light selective reflection layer 15 Protective layer 30 Discriminator 30a 1/4 wavelength plate 30b Polarizing plate

Claims (6)

[Claims] A first light selective reflection layer formed on a predetermined region of the substrate and reflecting only one of left circularly polarized light and right circularly polarized light among incident light; Formed on 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, and when right circularly polarized light is incident, the right circularly polarized light is converted into a left circularly polarized light. A phase difference providing layer which converts the light into polarized light and emits the same; and a second light selective reflecting layer which is formed in a predetermined region of the phase difference providing layer and reflects the same circularly polarized light as the polarized light reflected by the first light selective reflecting layer. Anti-counterfeit body having 2. A base material, a first light selective reflection layer formed on a predetermined region of the base material and reflecting only one of left circularly polarized light and right circularly polarized light among incident light, Formed on 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, and when right circularly polarized light is incident, the right circularly polarized light is converted into a left circularly polarized light. A phase difference providing layer that converts the light into polarized light and emits the light; and a second light selective reflecting 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 reflecting layer. Anti-counterfeit body. 3. The anti-counterfeit body according to claim 1, wherein the first light selective reflection layer displays discrimination information, and wherein the second light selective reflection layer is the same as or different from the discrimination information. An anti-counterfeit body characterized by displaying information with parallax. 4. A base material, a light selective reflection layer formed on the base material and reflecting only one of left circularly polarized light and right circularly polarized light among incident light, Formed in a predetermined area, when left circularly polarized light is incident, the left circularly polarized light is converted to right circularly polarized light and emitted, and when right circularly polarized light is incident, the right circularly polarized light is converted to left circularly polarized light. Anti-counterfeiting body having a phase difference providing layer to be injected. 5. The method according to claim 1, wherein:
The forgery discrimination method for performing forgery discrimination of the anti-counterfeiting body described in the paragraph, when a discriminator that transmits only one of the left circularly polarized light or the right circularly polarized light is applied, it disappears and cannot be visually confirmed. A forgery discrimination method characterized in that when there is an area, it is a genuine article, and when there is no area that disappears and cannot be visually checked, it is judged to be a forgery article. 6. A forgery discrimination method for performing forgery discrimination of an anti-counterfeiting body according to claim 3, wherein the forgery discrimination is performed through a first discrimination unit that transmits only one of the left circularly polarized light and the right circularly polarized light. If the discrimination information looks three-dimensional when viewed with the other eye through the second discrimination unit that transmits only the other light of the left circularly polarized light or the right circularly polarized light, it is a genuine product And
A forgery discrimination method characterized by discriminating a counterfeit product when it cannot be seen three-dimensionally.