JP4402382B2 - Authenticity determination medium, authenticity determination medium label, authenticity determination medium transfer sheet, authenticity determination sheet, and authenticity determination information recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a medium for authenticity determination that can be distinguished from those obtained by forgery or falsification based on unauthorized intentions. The present invention also relates to such a medium for authenticity determination processed into a label form or transfer sheet form suitable for application to an article. Furthermore, the present invention also relates to a sheet and an information recording body to which the authenticity determination medium is applied.
[0002]
[Prior art]
For example, credit cards, deposit and saving cards, various types of cash vouchers, or identification cards, etc., cause various troubles if they are counterfeited or tampered with and used illegally, so in order to prevent damage caused by forgery or tampering It is desirable to have a function that can identify the authenticity of each. In addition, for example, luxury products such as wristwatches, leather products, precious metal products or jewelry, in particular, what is said to be a luxury brand product, audio products, electrical appliances, music software recorded on media, video software, game software, Alternatively, computer software is also subject to counterfeiting, and similarly, it is desirable to have a function that can identify authenticity.
[0003]
Conventionally, holograms are frequently used for the purpose of enabling authenticity identification of various articles including the above-mentioned articles. This is because the hologram has manufacturing difficulties due to the precision of its structure. However, the method of manufacturing a hologram is known to experts, and since it is precise, it is difficult to distinguish between a genuine hologram and a forged hologram.
[0004]
Therefore, as a substitute for the hologram, a base material and a light selective reflection layer that is formed on one surface of the base material and reflects only one of the left-hand polarized light and the right-hand polarized light among the incident light. And a true / false determination body having a determination unit that includes determination information for determining a new product, which is formed on at least a part of the light selective reflection layer (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
JP 2000-25373 (page 3-5, FIG. 1)
[0006]
In the authenticity determination body described in Patent Document 1, the determination part is formed of an embossed hologram, and a precise pattern can be formed as the determination part. However, in order to form the determination part with an embossed hologram, it is necessary to sufficiently lengthen the contact time between the embossed mold and the material to be embossed, in order to sufficiently reproduce the unevenness of the hologram engraved in the embossed mold. In addition to the difficulty in shortening the manufacturing time, the manufacturing process of the embossing mold itself has a large number of steps, and thus there is a disadvantage that it is difficult to change the pattern of the determination unit.
[0007]
[Problems to be solved by the invention]
The problem of the present invention is that it is difficult to shorten the manufacturing time when forming the determination portion with an embossed hologram, and there are many steps during the manufacturing of the emboss mold, and it is difficult to change the pattern of the determination portion. It is an object of the present invention to provide a true / false determination medium that can eliminate the above-mentioned problem.
[0008]
[Means for solving the problems]
It has been found that the above-mentioned problems of the present invention can be solved by making the alignment state of the light selective reflection layer formed of, for example, a cholesteric liquid crystal layer different in a pattern, so that the present invention is reached based on this. I was able to.
[0009]
1st invention has the orientation pattern based on the difference in orientation on the surface of a base material, Out of the incident light on the surface which has the said orientation pattern, Left circularly polarized light or Right circularly polarized light In the medium for authenticity determination in which the light selective reflection layer that reflects any one of the above is laminated ,
The authenticity determination is characterized in that the orientation pattern is formed by laminating a non-orientation pattern and / or a low orientation pattern on the surface of the orientation film laminated on the surface of the substrate. It relates to a medium for use.
[0012]
According to a second invention, in the first invention, the surface of the substrate has orientation, and the orientation pattern has a non-orientation pattern and / or a low orientation pattern on the surface of the substrate. The present invention relates to a medium for authenticity determination, characterized in that it is configured by being laminated.
[0013]
The third invention is the first or second one of the invention, the light selective reflecting layer is related to authenticity determination medium, which is a cholesteric liquid crystal layer.
[0014]
The fourth invention relates to a medium label for authenticity determination, wherein an adhesive layer is further laminated on the medium for authenticity determination of any one of the first to third inventions.
[0015]
5th invention is related with the medium transfer sheet for authenticity determination characterized by the fact that the authenticity determination medium of any one of the 1st- 3rd invention is laminated | stacked on the peelable surface of the peelable base material. is there.
[0016]
A sixth invention relates to a sheet capable of authenticity determination, characterized by having the authenticity determination medium of any one of the first to third inventions visible in a part of the sheet.
[0017]
In the seventh invention, the authenticity determination medium according to any one of the first to third inventions is laminated on the surface of the information recording body which is the object of authenticity determination, or is visible on a part of the information recording body. The present invention relates to an information recording body capable of authenticity determination.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a view showing a laminated structure of a cross section of the authenticity determination medium of the present invention. As shown in FIG. 1 (a), the authenticity determination medium 1 has an alignment film 3 laminated on the upper surface of the substrate 2 in the figure, and the alignment film 3 has no orientation. By laminating the alignment pattern 4, an alignment pattern composed of an alignment film exposed in a portion without the non-alignment pattern 4 is formed, and the alignment pattern is formed on the alignment film 3 and the non-alignment pattern. 4, a light selective reflection layer 5 is laminated on one surface. Here, the light selective reflection layer 5 is, for example, a cholesteric liquid crystal layer, and the cholesteric liquid crystal has an alignment portion 5a in an alignment state on the alignment pattern.
[0019]
As shown in FIG. 1B, the authenticity determination medium 1 has the light selective reflection layer 5 on the orientation pattern formed by the presence or absence of the orientation film, that is, the orientation film 3a partially laminated. It may be laminated. The light selective reflection layer 5 is a cholesteric liquid crystal layer, for example, and has an alignment portion 5a having the same planar shape as the alignment film 3a on the alignment film 3a.
[0020]
In the example described with reference to FIG. 1, all of the examples require an alignment film different from the base material 2. However, when the stretched plastic sheet is used as the base material 2, the alignment film has an alignment film. Even if not, the surface has orientation. Therefore, since the orientation pattern is generated by laminating the non-orientation pattern on the base material 2, if the light selective reflection layer 5 which is a cholesteric liquid crystal layer, for example, is laminated thereon, reference is made to FIG. The orientation portion 5a similar to that described above is formed, and the authenticity determination medium 1 can be obtained. In addition, the orientation pattern may be based not only on the difference between “with orientation” and “without orientation” but also on the degree of orientation. For example, even when a resin solution capable of forming an alignment film is applied and rubbing is not performed, there is some alignment, so a combination of such a low-orientation and one that has no alignment at all, or has been rubbed An orientation pattern may be formed by a combination with the orientation film.
[0021]
In addition, the orientation may be partially lost or reduced by heating a part of the surface of the stretched plastic sheet or the part having the orientation of the base material 2 laminated with the orientation film. However, since an orientation pattern can be formed, if the light selective reflection layer 5 which is, for example, a cholesteric liquid crystal layer is laminated on the orientation pattern thus formed, as shown in FIG. The orientation part 5a is formed, and the authenticity determination medium 1 can be obtained.
[0022]
As the base material 2, it is possible to reduce the thickness, and it is preferable to have a solvent resistance and a heat resistance that can withstand the processing when manufacturing the medium for mechanical strength and authenticity determination. Since it depends on the purpose of use, it is not limited, but a film-like or sheet-like plastic is preferable. For example, various types of plastic films such as polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC), diacetyl cellulose, polyethylene / vinyl alcohol and the like can be exemplified. .
[0023]
Any alignment film 3 (including 3a) may be used as long as it can be generally used as an alignment film, such as polyvinyl alcohol resin (PVA) and polyimide resin. The alignment film 3 is formed by applying a solvent solution of these resins to the surface of the substrate 2 as described above and drying it, followed by rubbing with a cloth, a brush, or the like. If a coating film is formed in a pattern using various printing methods instead of coating and rubbing is performed, a patterned alignment film 3a can be formed into an alignment pattern.
[0024]
When the non-orientation pattern 4 or the low orientation pattern is formed on the formed alignment film 3, various methods and materials can be used, but various printing methods are advantageous for pattern formation. Accordingly, it is preferable to use an appropriate resin solution or dispersion, and as the resin solution or dispersion, a colored solution may be used as necessary.
[0025]
The material constituting the non-orientation pattern 4 or the low orientation pattern and the material constituting the lower alignment film may be the same or different, but both are the same, and the non-orientation pattern 4 or the low orientation pattern 4 is low. When the orientation pattern is made of a transparent material, the light selective reflection layer 5 is laminated on the upper layer, and when the right circularly polarized light or the left circularly polarized light reflected by the light selective reflective layer is irradiated, the transparency is high. There is an advantage that the pattern is visible.
[0026]
The light selective reflection layer 5 is made of a cholesteric liquid crystal layer, and a portion corresponding to the orientation pattern in the lower layer is in an aligned state. The cholesteric liquid crystal layer in the aligned state has a property of reflecting only one of left circularly polarized light and right circularly polarized light in incident light. The cholesteric liquid crystal layer is used by applying a solvent solution, which is a composition containing cholesteric liquid crystal, and drying, or at this time, using a polymerizable cholesteric liquid crystal composition to prepare an ultraviolet polymerizable composition, After coating and drying, it can also be formed by irradiating with ultraviolet rays for polymerization.
[0027]
When the light selective reflection layer 5 is observed with natural light when laminated on the orientation pattern, as shown schematically in FIG. 3A, the light selective reflection layer 5 is a pattern corresponding to the orientation pattern (here, the letter “A”). .) 5a is a latent image, which is not visible at all or can only be seen indistinctly. It is assumed that the reverse pattern portion of the letter “A” in the light selective reflection layer 5, that is, the background portion of “A” is in an oriented state. Here, if the light selective reflection layer 5 has a property of reflecting only the right circularly polarized light, when the right circularly polarized light is incident on the light selective reflective layer 5, the reverse pattern of "A", that is, the background of "A" Reflection occurs in the pattern portion, but no reflection occurs in the portion “A”, so that the letter “A” can be visually recognized due to the difference in brightness (FIG. 3B). A background portion appears colored based on the helical pitch of the cholesteric liquid crystal, and when the left circularly polarized light is incident on the light selective reflection layer 5, the left circularly polarized light is not reflected. All parts are dark (FIG. 3C).
[0028]
Further, if the light selective reflection layer 5 has a property of reflecting only the left circularly polarized light, the right circularly polarized light is not reflected when the right circularly polarized light is incident. Therefore, both the letters “A” and the background are dark. When the left circularly polarized light is incident, the letter “A” can be visually recognized due to the difference between brightness and darkness, and the portion in the aligned state appears colored based on the helical pitch of the cholesteric liquid crystal.
[0029]
Therefore, the authenticity determination medium 1 of the present invention in which the light selective reflection layer 5 is laminated on the orientation pattern exhibits different reflectivity by allowing the right circularly polarized light and the left circularly polarized light to be incident separately, and observed. From the viewpoint of the person who sees it, it will look different, so check the appearance of the authentic thing in advance, or make each of the right circular polarization and the left circular polarization both authentic and true / false It is possible to make a true / false judgment by entering and comparing the reflectivity or appearance. In addition, right circularly polarized light or left circularly polarized light is incident on the light selective reflection layer 5 and is observed by simply observing the right circularly polarizing plate or the left circularly polarized light on the light selective reflection layer 5. Also good.
[0030]
The authenticity determination medium 1 described with reference to FIG. 1 and FIG. 2 is used for authenticity determination by processing into a label or transfer sheet form as described below with reference to FIG. Application to various articles to which the medium is to be applied can be facilitated.
[0031]
FIG. 4A relates to the label form, and the example shown in the figure is an adhesive layer on the light selective reflection layer 5 side of the authenticity determination medium 1 having a laminated structure as described with reference to FIG. The authenticity determination medium label 11 is configured by laminating 6. As the authenticity determination medium 1 to be used, in addition to the medium shown in FIG. 2, the medium shown in FIG. 1 (a) and FIG. 1 (b) may be used. 4A, the adhesive layer 6 is laminated on the light selective reflection layer 5 side, but the adhesive layer may be laminated on the substrate 2 side. However, when the authenticity determination medium 1 is configured using a base material that requires the alignment film 3 such as a triacetyl cellulose film, in order to see the latent image as described above, In order for the latent image to be visible, right circularly polarized light or left circularly polarized light may be incident from the light selective reflection layer 5 side or from the substrate 2 side, but a polyethylene terephthalate resin film or a polycarbonate resin may be used. When the surface is oriented like a film and is configured using a base material that does not require an orientation film, it is necessary to make right circularly polarized light or left circularly polarized light incident from the light selective reflection layer 5 side. is there. In addition, when the adhesive bond layer is laminated | stacked on the base material 2 side, you may laminate | stack a protective layer on the light selective reflection layer 5 side. The adhesive layer 6 can be various types of adhesive layers, but is preferably a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer.
[0032]
FIG. 4B relates to the form of the transfer sheet. The adhesive layer 6 and the base material 2 side are provided on the light selective reflection layer 5 side of the authenticity determination medium 1 having a laminated structure as described with reference to FIG. The authenticity determination medium transfer sheet 12 is configured by laminating the peelable surface 7 a of the peelable substrate 7. As in the case of the authenticity determination medium label 11, the authenticity determination medium 1 to be used may be the one shown in FIGS. 1A and 1B in addition to the one shown in FIG. In the above description referring to FIG. 4B, the peelable base material 7 is laminated on the base material side 2 side and the adhesive layer 6 is laminated on the light selective reflection layer 5 side. The peelable substrate 7 may be laminated on the 5 side, and the adhesive layer 6 may be laminated on the substrate 2 side. However, in the case where the authenticity determination medium 1 is configured using a base material that requires the alignment film 3, the authenticity determination medium label 11 described above depends on whether the transfer target is transparent or opaque. The adhesive layer 6 may be laminated on a preferable side based on the same considerations as in the case. The adhesive layer 6 may be various types of adhesive layers, but may be a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer. The adhesive layer may be applied to the surface of the adherend, and a transfer sheet without an adhesive layer may be used.
[0033]
The authenticity determination medium 1 of the present invention is preferably applicable to various articles using the authenticity determination medium label 11 or the authenticity determination medium transfer sheet 12 as described above. The authenticity determination medium label 11 is applied by adhering the adhesive layer 6 toward the article to be adhered, and the authenticity determination medium transfer sheet 12 is attached to the adhesive layer 6. After making it adhere | attach toward the articles | goods side used as a body, it applies by peeling the peelable base material 7. FIG.
[0034]
FIG. 5 is a diagram for explaining application of the authenticity determination medium 1 mainly for a sheet-like object. What is shown in FIG. 5A is an information recording body 21 capable of authenticating authenticity, in which the authenticity determination medium 1 is laminated on a part of the surface of the information recording body 9. The information recording body 9 is in the form of a sheet made of paper or plastic sheet as a base material. In the example shown in the figure, information such as the amount of money to be used as a voucher, the name of the issuing company, letters such as a cautionary note, a coloring pattern, etc. It is formed and recorded by means such as printing.
[0035]
In FIG. 5 (b), a medium for authenticity determination is built in a sheet-like material in advance so as to be visible, and a concave opening 10 that does not become a through hole is formed in paper or a plastic sheet. The authenticity determination medium 1 is formed so that it can be seen from the opening 10, and the authenticity determination medium 1 is shown in a very narrow width of about 0.5 mm to 5 mm as an example for easy application. It is cut into a vertically long thread, and when laminating several layers constituting paper, an opening 10 is provided in the layer constituting the surface layer, and a thread-like authenticity determination medium is sandwiched between the layers. It is formed by applying. If necessary, the thread-like authenticity medium is colored on one side, such as the base material, for the purpose of improving the visibility when irradiated with circularly polarized light. In order to ensure the adhesiveness between the thread-like authenticity determination medium and the sheet-like material in a state where the adhesive is used, an adhesive layer, preferably a heat-sensitive adhesive layer, may be laminated on both sides. Such a sheet-like material to which a medium for authenticity determination is applied is suitable for use in an information recording medium, particularly a printed matter having a cash voucher or other economic value.
[0036]
【Example】
Example 1
A TAC film is prepared, and a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., product number: “110”, used as a 5% aqueous solution (transparent)) is applied to the surface and dried, followed by rubbing treatment. An alignment film was formed. Subsequently, gravure printing was performed on the alignment film using the same PVA solution (transparent) used to form the alignment film, thereby forming characters and designs. Thereafter, on the entire surface of the alignment film including the letters and designs, nematic liquid crystal (BASF Co., Ltd., trade name: “Palio Color LC242”), chiral agent (BASF Co., Ltd., trade name; “Palio Color”) LC756 ") and a 15% solution of a blended UV polymerization initiator (solvents are toluene and methyl ethyl ketone, referred to as polymerizable cholesteric liquid crystal ink) are coated on one side and dried to develop a cholesteric liquid crystal phase. Irradiation was performed to form a cholesteric liquid crystal layer having a thickness of 2 μm that reflects only right-handed circularly polarized light, and a medium for authenticity determination was obtained.
[0037]
(Example 2)
A PET film was prepared as a substrate, and a medium for authenticity determination was obtained in the same manner as in Example 1 except that the alignment film was not formed.
[0038]
In the authenticity determination media obtained in Example 1 and Example 2, the cholesteric liquid crystal is not aligned on the characters and the pattern formed by gravure printing, and is aligned in the other portions, but the characters and The pattern could hardly be confirmed under normal illumination, but when the right circularly polarizing plate was superimposed on the cholesteric liquid crystal layer, the letters and the pattern became dark and the other portions were colored. Further, when the right circularly polarizing plate was removed and the left circularly polarizing plate was overlaid on the cholesteric liquid crystal layer, the entire cholesteric liquid crystal layer became dark and no characters or designs were observed. In addition, when the right circularly polarizing plate and the left circularly polarizing plate were stacked on the substrate side, the same result as above was obtained in the example 1, but in the example 2, any circularly polarized light was obtained. Even when the plates were stacked, the whole color was dark and characters and designs could not be observed.
[0039]
(Comparative Example 1)
A laminate in which a TAC film, a colored ink pattern, and a cholesteric liquid crystal layer are sequentially laminated is obtained in the same manner as in Example 1 except that the TAC film is used as a base material and gravure printing is performed using a normal colored ink. It was. In this laminate, characters and designs are visible under normal illumination, and when the right circular polarizing plate is superimposed on the cholesteric liquid crystal layer, portions other than the characters and designs are colored, and the right circular polarizing plate When the left circularly polarizing plate was overlaid on the cholesteric liquid crystal layer, the entire cholesteric liquid crystal layer turned dark. However, when any of the circularly polarizing plates was overlaid, letters and designs could be observed.
[0040]
(Comparative Example 2)
The TAC film, the cholesteric liquid crystal layer, and the colored ink pattern were sequentially formed in the same manner as in Example 1 except that the TAC film was used as a base material and gravure printing was performed on the cholesteric liquid crystal layer using a normal colored ink. A laminated body was obtained. In this laminate, characters and designs are visible under normal illumination, and when the right circular polarizing plate is overlaid on the cholesteric liquid crystal layer, only the portions other than the characters and designs are colored. When the polarizing plate is removed and the left circular polarizing plate is superimposed on the cholesteric liquid crystal layer, only the portions of the cholesteric liquid crystal layer other than the characters and designs become dark. And the design was observable.
[0041]
【The invention's effect】
According to the invention of claim 1, the light selective reflection layer is a lower layer formed by laminating a non-orientation pattern or / and a low orientation pattern on the surface of the orientation film laminated on the surface of the substrate. An orientation portion corresponding to the orientation pattern is generated, and the orientation pattern can be easily formed by, for example, printing, so that the number of manufacturing steps is not increased and the pattern can be easily changed. A fake determination medium can be provided.
[0044]
According to the invention of claim 2 , in addition to the effect of the invention of claim 1, a non-orientated or / and low-orientated pattern is formed by printing or the like by using a substrate having a surface with orientation. Thus, it is possible to provide a true / false determination medium capable of forming an orientation pattern.
[0045]
According to the invention of claim 3 , in addition to the effect of the invention of claim 1 or 2 , the light selective reflection layer is specifically composed of a cholesteric liquid crystal layer. It is possible to provide a true / false determination medium that can be easily applied on an orientation pattern using the.
[0046]
According to the invention of claim 4, the medium for authenticity determination capable of exerting the effect of the invention of any one of claims 1 to 3 can be easily applied to an article using an adhesive layer. A media label can be provided.
[0047]
According to the invention of claim 5, since the authenticity determination medium capable of exhibiting the effects of any of claims 1 to 3 is configured to be transferable, the authenticity that can be easily applied to an article A medium transfer sheet for determination can be provided.
[0048]
According to the invention of claim 6, since the medium for authenticity determination according to any one of claims 1 to 4 is applied, it is possible to determine whether the information to be added is true or false. Sheets can be provided.
[0049]
According to the invention of claim 7 , since the authenticity determination medium of any of the inventions of claims 1 to 3 is applied, information recording capable of authenticity determination enabling self-authentication determination is possible. The body can be provided.
[Brief description of the drawings]
FIG. 1 is a view showing a laminated structure of a medium for authenticity determination according to the present invention.
FIG. 2 is a view showing a laminated structure of another authenticity determination medium of the present invention.
FIG. 3 is a diagram showing a state of authenticity determination using the authenticity determination medium of the present invention.
FIG. 4 is a diagram showing a label and a transfer sheet suitable for applying the authenticity determination medium of the present invention to various articles.
FIG. 5 is a diagram showing an application example of the authenticity determination medium of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ......... Authenticity determination medium 2 ......... Base material 3 .... Alignment film 4 .... Non-orientation pattern 5 ..... Photoselective reflection layer (5a; orientation part)
6: adhesive layer 7: peelable substrate (7a; peelable surface)
8... Information recording body 9... Information 10... Opening 11... Reality determination medium label 12. Body 22 ......... Authenticity sheet

Claims (7)

The substrate has an orientation pattern based on the orientation difference on the surface of the base material, and reflects either left circularly polarized light or right circularly polarized light out of the incident light on the surface having the oriented pattern. In the medium for authenticity determination in which the light selective reflection layer is laminated ,
The authenticity determination is characterized in that the orientation pattern is formed by laminating a non-orientation pattern and / or a low orientation pattern on the surface of the orientation film laminated on the surface of the substrate. Media.   The surface of the substrate has orientation, and the orientation pattern is formed by laminating a non-orientation pattern and / or a low orientation pattern on the surface of the substrate. The medium for authenticity determination according to claim 1. Claim 1 or claim 2 authenticity determination medium according any one the light selective reflection layer is characterized in that it is a cholesteric liquid crystal layer. An authenticity determination medium label, wherein an adhesive layer is further laminated on the authenticity determination medium according to any one of claims 1 to 3 . You claim 1 to 3 authenticity determination medium transfer sheet, characterized in that the authenticity determination medium according to any one is stacked peelable surface of the releasable substrate. A sheet capable of authenticity determination, comprising the medium for authenticity determination according to any one of claims 1 to 3 so as to be visible in a part of the sheet. The authenticity determination medium according to any one of claims 1 to 3 is laminated on a surface of an information recording body that is an object of authenticity determination, or is visible on a part of the information recording body. An information recording medium that can determine whether the feature is true or false.

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