JPH0858224A - Data carrier member - Google Patents

Abstract

PURPOSE: To provide a data carrier member hardly forged and altered and capable of simply judging the fact of forgery and alteration by the naked eye. CONSTITUTION: A data carrier member (transparent card) 50 is mainly constituted of a transparent card base material 51 and a discrimination part 52 formed from optically variable ink containing light pervious optically variable flakes and generating color shift between two or more different colors corresponding to an angle of incident light. The reflected light from the discrimination part 52 generates color shift between two or more different colors while the light transmitted through the card base material 51 is in the relation of a complementary color with reflected light at the angle position at that time and is shifted while it keeps the complementary color relation with reflected light corresponding to a looking angle position to generate color shift between two or more different colors. Therefore, by respectively confirming the peculiar color shift of reflected light and that of transmitted light in the discrimination part provided to the data carrier member, the genuineness of the data carrier member can be judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information carrier such as a passport, driver's license, stock certificate, bond, check, ID card, credit card, gift card, etc.
The present invention relates to an improvement of an information carrier which is difficult to be altered and whose facts can be easily judged by the naked eye even when these are forged or altered.

[0002]

2. Description of the Related Art In recent years, with the spread of color copying machines, there have been a lot of cases where counterfeit securities such as stocks, bonds, checks, passbooks and lottery tickets are forged.

On the other hand, ID cards such as passports and driver's licenses are provided with a face photo column and a signature column for identifying whether or not the owner is the owner. Recently, these columns have been provided. There have been many cases of falsification, alteration and misuse.

Therefore, conventionally, in order to prevent such forgery and alteration, a printing ink containing an infrared absorbing substance such as a leuco dye is used in an infrared reading device at an arbitrary portion such as the above-mentioned securities and identification card. A machine-readable information pattern has been adopted. That is, for the former counterfeit copy, the copying machine main body is provided with means for mechanically reading the information pattern, and by providing the control means for stopping the copying operation when the information pattern is read by the copying machine. In order to prevent this, and in the case of tampering with the latter, the ID card such as the created passport or driver's license is mechanically read by an infrared reading device to determine the presence or absence of the above information pattern. The truth is determined.

However, since an infrared absorbing substance such as a leuco dye has a light absorbing property even in the visible region, the above information pattern can be mechanically read by an infrared reading device and its existence is easily recognizable to the naked eye. It has been insufficient as a means for effectively preventing the above-mentioned forgery and alteration.

[0006] On the other hand, a hologram layer is formed on an arbitrary portion of the above-mentioned securities, identification card, etc., and the above-mentioned forgery / counterfeiting is performed depending on the presence / absence of a hologram pattern reproduced from this hologram layer.
A method for preventing alteration has also been developed. That is, the main part of this hologram layer is composed of the uneven pattern composed of the interference fringes formed on the surface of the resin layer, and when the surface is irradiated with white light, the diffracted light reflected by the uneven pattern surface interferes with each other. An image is formed and the hologram pattern described above is reproduced at the image forming position.

[0007]

However, this hologram layer also has a problem that it is relatively easy for a person having knowledge of holograms to forge it. That is, the hologram layer formed on the hologram layer is formed by irradiating the hologram layer formed on an arbitrary portion such as an identification card with laser light, and causing the reflected laser light to enter a preset photosensitive material. This is because so-called dead copying, which is a copying of the uneven pattern on the photosensitive material, can be performed relatively easily.

The present invention has been made by paying attention to such a problem. The problem is that it is difficult to counterfeit / alter, and even if these counterfeits / alterations are made, the fact is An object is to provide an information carrier that can be easily determined with the naked eye.

[0009]

That is, the information carrier according to the invention of claim 1 contains light-transmissive optically variable flakes, and includes two or more different colors depending on the angle of incident light. An identification portion for authenticity determination formed of an optically variable ink that causes color misregistration is provided at an arbitrary position on the base material, and at least the portion of the base material on which the identification portion is formed is light-transmissive. It is characterized by having.

In the invention according to claim 1, the optically transparent optically variable flakes contained in the optically variable ink have an optical film thickness (n · d, n is a refractive index, and d is a physical film thickness). It consists of a multi-layer optical thin film in which low-refractive index layers and high-refractive index layers of ceramic materials are alternately combined, and reflects or transmits light rays in a predetermined wavelength range, and by changing the viewing angle (that is, the angle of incident light). Depending on the optical path length in the thin film, the color of the transmitted light or the reflected light appears to change. Therefore, the reflected light from the identifying portion formed of the above-mentioned optically variable ink is 2
While the color shift occurs between the above different colors, the transmitted light transmitted through the light transmissive base material has a complementary color relationship with the reflected light at the angular position at that time, and the complementary color relationship with the reflected light depending on the viewing angular position. The color shift is caused to occur between the two or more different colors while maintaining the above value.

Therefore, it is possible to judge the authenticity of the information carrier by visually observing the color shift peculiar to the reflected light and the color shift peculiar to the transmitted light in the identifying portion provided on the information carrier. Is possible.

Further, the above-mentioned optical characteristics of the above-mentioned optically variable flakes are largely dependent on each film thickness of the multilayer optical thin film constituting this optically variable flake, the total number of films, the type of material constituting each thin film and the combination thereof. The optical characteristics vary greatly with slight variations in these parameters.

Therefore, it is practically difficult to inspect the optically variable ink constituting the discriminating portion to prepare flakes having the same optical characteristics as the optically variable flakes contained in the ink, and thus it is practically difficult to carry the information. It is possible to reliably prevent forgery / alteration of the body, and even when the forgery / alteration is performed, the difference in the color shift of the reflected light and the color shift of the transmitted light in the above-mentioned identification portion can be visually confirmed. By doing so, it becomes possible to easily judge the fact of forgery / alteration.

Regarding the base material on which the identification portion is formed, it is sufficient that at least the portion of the base material on which the identification portion is provided has a light-transmitting property, and the entire base material is a light-transmitting material. The base material may be formed, or the base material may be made of a material that is light-transmissive only in the portion where the identification portion is provided and is not light-transmissive in other portions. Any material such as a plastic film, a sheet, or a synthetic paper can be selected according to the application. Further, by forming an information pattern such as a character pattern, a bar code pattern, a graphic pattern, etc., with an ink appropriately on the portion of the base material where the identification portion is provided, the object of authenticity determination is the reflected light and transmitted light of the identification portion. Since the color misregistration information and the information pattern are used, it is possible to more reliably prevent counterfeiting / alteration of the information carrier as the number of determination targets increases. The invention according to claim 2 is made for such a technical reason.

That is, the invention according to claim 2 is premised on the information carrier according to the invention according to claim 1, and an information pattern for authenticity determination is provided in a portion of the base material where the identification portion is formed. It is characterized by that.

Next, in order to improve the accuracy of the color shift information of the reflected light and the transmitted light in the discrimination section, the reflection of the optically variable flakes contained in the optically variable ink constituting the discrimination section in the reflected light region. The transmittance is preferably 50% or more, and the transmittance in the transmitted light region is preferably 50% or more,
More preferably, the reflectance of the optically variable flakes in the reflected light region is 70% or more, and the transmittance in the transmitted light region thereof is 7%.
It is preferably 0% or more. Claims 3 and 4
The invention according to is based on such technical reasons.

That is, the invention according to claim 3 is premised on the information carrier according to the invention according to claim 1 or 2, wherein the optical variable flakes have a reflectance of 50% or more in the reflected light region, The invention according to claim 4 is characterized in that the optical variable flakes have a reflectance in the reflected light region of 70% or more, and a transmitted light in the transmitted light region of 50% or more. It is characterized in that it has an optical characteristic that the transmittance in the region is 70% or more.

Further, the above-mentioned optically variable flakes are composed of a multilayer optical thin film in which the ceramic materials of the low refractive index layer and the high refractive index layer are alternately combined, as described above. Considering that the above-mentioned optical characteristics are realized and the identification portion formed on the base material is apparently flat, the total film thickness thereof is preferably less than 1.2 μm, more preferably 0.6 μm or less. . Also,
Regarding the total number of layers of the multilayer optical thin film, while the above-mentioned optical characteristics are realized with a minimum of two layers, if the layers are excessively laminated, the optical transparency of the optically variable flakes is impaired. Therefore, the total number of layers is 5 or less. Is desirable. Furthermore, regarding the difference in refractive index between the low refractive index layer and the high refractive index layer,
Considering the contrast and sharpness of the color shift of the reflected light and the color shift of the transmitted light in the above-mentioned identification portion, it is 0.3 or more, preferably 0.5 or more. Claims 5 to 11
The invention according to (3) is made from such a technical demand.

That is, the invention according to claim 5 is based on the information carrier according to any one of claims 1 to 4, and the optically variable flakes have a multilayer thin film structure. The invention according to claim 6 is based on the information carrier according to claim 5, characterized in that the total film thickness of the multilayer thin film is less than 1.2 μm.
The invention according to (2) is characterized in that the total film thickness of the multilayer thin film is 0.6 μm or less.

Next, the invention according to claim 8 is based on the information carrier according to claim 5, characterized in that the total number of the multilayer thin films is 2 to 5 layers. The invention according to 9 is characterized in that the multilayer thin film structure is composed of high refractive index layers and low refractive index layers which are alternately arranged.

Further, the invention according to claim 10 is the invention according to claim 9.
Based on the information carrier according to the invention described above, the difference in the refractive index between the high refractive index layer and the low refractive index layer is 0.3 or more, the invention according to claim 11, It is characterized in that the refractive index layer and the low refractive index layer are made of a ceramic material.

Next, as constituent materials applicable to the high refractive index layer in the above optically variable flakes, titanium dioxide (refractive index n = 2.3) and zirconium dioxide (refractive index n
= 2.1), zinc sulfide (refractive index n = 2.3), cerium dioxide (refractive index n = 2.3 to 2.5), zinc oxide (refractive index n = 2.1), tantalum oxide (refractive index) Rate n = 2.2),
Indium oxide (refractive index n = 2.0), tin oxide (refractive index n = 2.0), tin oxide-indium oxide mixture (IT
O, the refractive index n = 2.0) and other ceramic materials, and the constituent materials applicable to the low refractive index layer include magnesium fluoride (refractive index n = 1.4) and calcium fluoride (refractive index n = 1.4). n = 1.4), cerium fluoride (refractive index n =
1.63), aluminum fluoride (refractive index n = 1.
3), silicon dioxide (refractive index n = 1.5), aluminum oxide (refractive index n = 1.6), magnesium oxide (refractive index n = 1.6), magnesium fluoride (refractive index n = 1.
4) and other ceramic materials. As described above, the optical characteristics of the transmitted light and the reflected light can be changed by changing each film thickness of the multilayer optical thin film, the total number of films, the type of material forming each thin film and the combination thereof. In addition, materials other than those listed above are not particularly limited to substances as long as the difference in refractive index between the high refractive index layer and the low refractive index layer is 0.3 or more. Claims 12 and 13 relate to the invention in which the materials forming the high refractive index layer and the low refractive index layer are specified.

That is, the invention according to claim 12 is based on the information carrier according to claim 9, wherein the high-refractive-index layer comprises titanium dioxide, zirconium dioxide, zinc sulfide, cerium dioxide, zinc oxide, The invention according to claim 13 is characterized in that it is made of a ceramic material selected from tantalum oxide, indium oxide, tin oxide, and a mixture of tin oxide-indium oxide.
The low refractive index layer is made of a ceramic material selected from magnesium fluoride, calcium fluoride, cerium fluoride, aluminum fluoride, silicon dioxide, aluminum oxide, magnesium oxide, and magnesium fluoride. It is a feature.

Next, as the film forming means of the multilayer thin film forming the optically variable flakes, any film forming method can be applied as long as the film thickness of each thin film can be controlled. Among them, the dry method is excellent for forming a thin film, and includes a normal vapor deposition method, a physical vapor deposition method such as sputtering, and a CV method.
A chemical vapor deposition method such as the D method can be used.
In particular, the method for producing optically variable flakes using a vacuum roll coater is industrially suitable.

The optically variable ink can be obtained by dispersing the above optically variable flakes in an ink vehicle in the same manner as the pigment. Any kind of ink vehicle may be used as such an ink vehicle, and an appropriate vehicle condition is set according to the printing method of the above-mentioned identification portion, the type of the base material on which the identification portion is formed, and other printing conditions. do it. For example, cellulosic, vinyl chloride, acrylic, polyamide, polyester, epoxy resin as a binder, evaporative drying, oxidative polymerization, two-liquid reaction,
A drying method such as photocuring can be used.

As the above printing method, letterpress printing,
There are methods such as gravure printing, offset printing, and screen printing, and an appropriate method may be selected.

At this time, it should be noted that the optically variable flakes are uniformly dispersed in the ink vehicle and the optical characteristics of the optically variable flakes are not impaired. It is desirable that the particle size of 2 to 20 μm. However, depending on the printing method, the viscosity of the ink, etc., a suitable particle size of the optically variable flakes can be appropriately set within this range and dispersed in the vehicle for use.

The information carrier is applicable to:
Various identification documents such as the passport and driver's license mentioned above,
Stock certificates, bonds, checks, passbooks, lottery tickets, tickets, coupon tickets,
In addition to securities such as commuter passes, plastic cards such as ID cards, credit cards, cash cards, and gift cards, securities-related products such as prepaid cards typified by telephone cards, which can be replaced with cash vouchers, and banknotes can be cited.

[0029]

According to the information carrier of the present invention, the light-transmitting optically variable flakes are contained between two or more different colors depending on the angle of incident light. An identification portion for authenticity determination formed of an optically variable ink that causes color misregistration is provided at an arbitrary position on the base material, and at least the portion of the base material on which the identification portion is formed is light-transmissive. It is characterized by having.

The optically transmissive optically variable flakes contained in the above optically variable ink reflect or transmit light rays in a predetermined wavelength range, and by changing the viewing angle (that is, the angle of the incident light). It has an optical characteristic that the color of transmitted light or reflected light looks different. Therefore, the reflected light from the identification portion formed of the optically variable ink causes a color shift between two or more different colors, while the transmitted light transmitted through the light transmissive base material has an angular position at that time. There is a complementary color relationship of the reflected light at, and a shift occurs while maintaining a complementary color relationship with the reflected light depending on the viewing angle position, causing a color shift between two or more different colors.

Therefore, it is possible to determine the authenticity of the information carrier by confirming the color shift peculiar to the reflected light and the color shift peculiar to the transmitted light in the identification portion provided on the information carrier. Become.

In addition, it is practically difficult to inspect the optically variable ink constituting the above-mentioned identification part to prepare flakes having the same optical characteristics as the optically variable flakes contained in the ink, so that it is difficult to carry information. It is possible to reliably prevent forgery / alteration of the body, and even when the forgery / alteration is performed, the difference in the color shift of the reflected light and the color shift of the transmitted light in the above-mentioned identification portion can be visually confirmed. By doing so, it becomes possible to easily judge the fact of forgery / alteration.

On the other hand, according to the information carrier according to the inventions of claims 2 and 3 to 13, the information pattern for authenticity determination is provided at the portion of the base material where the identification portion is formed. Since the target of authenticity determination in the information carrier is the color shift information of the reflected light and transmitted light in the identification unit and the above information pattern, the number of determination targets increases, so that forgery / alteration of the information carrier is more reliable. It becomes possible to prevent it.

[0034]

EXAMPLES Examples of the present invention will be described in detail below.

A plurality of optically variable inks (preparation examples 1 to 3) applied in the examples prior to the examples of the present invention.
1 and Comparative Examples 1 to 5) were prepared, respectively, and printed on the appropriate substrate described below to visually evaluate the optical variability. “Preparation of Optically Variable Ink”, that is, the optically variable ink is an optically variable flake having a three-layer thin film structure shown in FIG. 2 or a five-layer thin film structure shown in FIG. 3 and polyester as an ink vehicle. Resin and ethyl acetate,
Further, it is prepared by mixing an auxiliary agent for improving the dispersion of the optically variable flakes in a predetermined mixing ratio.

As the above-mentioned auxiliary agent, any type may be used, and materials and compounding ratios are set so as to be appropriate conditions in accordance with the printing method, the type of substrate and other printing conditions. There is. For example, a surfactant such as a nonionic surfactant, anionic surfactant, or a cationic surfactant can be used as the dispersant, but in this example, the nonionic surfactant is applied. There is.

Then, the prepared optically variable ink is
The visible transmission spectrum and reflection spectrum of the transparent polyester film and the black polyester film, which are coated on the transparent polyester film and the black polyester film by a bar coater or printed in a pattern by screen printing to form an ink coating, are used for ultraviolet and visible spectrophotometry. Optical variability (that is, “complementary color”, “color change”, and “visibility”) was evaluated by measuring with a meter (however, only the data of Preparation Example 31 is shown) and visually. {Preparation Example 1} First, as shown in FIG. 2, the optically variable flakes 10 were formed into a high refractive index layer 1, a low refractive index layer 2 and a high refractive index layer 1.
The three-layer thin film structure was applied, zinc sulfide was used as the high refractive index layer 1, and magnesium fluoride was used as the low refractive index layer 2, and the total thickness of the three-layer thin film was 0.5 μm or less. Further, the particle size of the optically variable flake 10 is 2 to 20 μm.
Those within the range of m were applied and dispersed in the above vehicle to obtain an optically variable ink.

Next, when the transparent polyester film and the black polyester film on which the ink coating of the optically variable ink is formed is viewed from the vertical direction, the central wavelength of absorption in transmitted light, that is, The central wavelength of reflection was 580 nm, and the reflected light appeared yellow and the transmitted light appeared blue-violet. At this time, the reflectance of the reflected light is 70
%, And the transmittance in the transmitted light region was 70% or more. On the other hand, when the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

In this way, the reflected light causes a color shift between two or more different colors, and at the same time, the transmitted light has a complementary color relationship with the reflected light at the angular position at that time, and the reflected light is different from the reflected light depending on the viewing angular position. Shifting while maintaining the complementary color relationship caused a color shift between two or more different colors.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility".

In the item "Complementary color", the one in which the contrast of the complementary color can be confirmed very clearly is indicated by ⊚, the clear one is indicated by ○, and the unclear one is indicated by ×, and "color change" is indicated.
In the item of, the color shift can be confirmed very clearly, ◎, the clear one is indicated by ○, the unclear one is indicated by ×, and in the “Visibility”, the above “complementary color” and “color change” are displayed. Is marked with ⊚, the clear is marked with ○, and the unclear is marked with ×. {Preparation Example 2} In the optically variable flakes 10, except that zinc sulfide is used as the high refractive index layer 1 and calcium fluoride is used as the low refractive index layer 2, the total thickness of the three-layer thin film and the particle size of the flakes. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 3} Total thickness of three-layer thin film and particle size of flakes except that zinc sulfide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". Preparation Example 4 Except that zirconium dioxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flakes 10, the total film thickness of the three-layer thin film and the particle size of the flakes, etc. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 5} The total thickness of the three-layer thin film and the particle size of the flakes except that zirconium dioxide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed in a direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". Preparation Example 6 Except that zirconium dioxide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2 in the optically variable flake 10, the total film thickness of the three-layer thin film and the particle size of the flakes. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 7} Except that titanium dioxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flake 10, the total film thickness of the three-layer thin film and the particle size of the flakes, etc. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed in the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 8} The total film thickness of the three-layer thin film and the particle size of the flakes, etc., except that titanium dioxide is applied as the high refractive index layer 1 and magnesium oxide is applied as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed vertically from the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 9} The total film thickness of the three-layer thin film and the particle size of the flakes, etc., except that titanium dioxide is applied as the high refractive index layer 1 and aluminum oxide is applied as the low refractive index layer 2 in the optically variable flake 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed in the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". Preparation Example 10 Except that cerium dioxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flake 10, the total thickness of the three-layer thin film and the particle size of the flakes, etc. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 11} The total film thickness of the three-layer thin film and the particle size of the flakes except that cerium dioxide is used as the high refractive index layer 1 and cerium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 12} The total film thickness of the three-layer thin film, the particle size of the flakes, etc. are the same except that cerium dioxide is used as the high refractive index layer 1 and aluminum oxide is used as the low refractive index layer 2 in the optically variable flakes 10. It is the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 13} Except that zinc oxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flakes 10, the total film thickness of the three-layer thin film and the particle size of the flakes, etc. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of transmission absorption, that is, the central wavelength of reflection is 580 nm.
The reflected light appeared yellow and the transmitted light appeared violet. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, when the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 14} The total film thickness of the three-layer thin film and the particle size of the flakes except that zinc oxide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 15} In the optically variable flakes 10, except that zinc oxide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2, the total film thickness of the three-layer thin film and the particle size of the flakes. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 16} The total film thickness of the three-layer thin film and the particle size of the flakes, etc., except that tantalum oxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 1 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 17} Total thickness of three-layer thin film and particle size of flakes except that tantalum oxide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 18} Total thickness of three-layer thin film and particle size of flakes except that tantalum oxide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 19} The total film thickness of the three-layer thin film and the particle size of the flakes, etc., except that indium oxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 20} In the optically variable flakes 10, except that indium oxide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2, the total film thickness of the three-layer thin film and the particle size of the flakes. The preparation example 1 described above
The same as the optically variable flakes of the present invention.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 21} The total film thickness of the three-layer thin film and the particle size of the flakes except that indium oxide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. The preparation example 1 described above
The same as the optically variable flakes of the present invention.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 22} In the optically variable flakes 10, except that tin oxide is used as the high refractive index layer 1 and silicon dioxide is used as the low refractive index layer 2, the total thickness of the three-layer thin film and the particle size of the flakes, etc. Is the same as the optically variable flake according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 23} The total film thickness of three-layer thin film and the particle size of flakes except that tin oxide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 24} Total thickness of three-layer thin film and particle size of flakes except that tin oxide is used as the high refractive index layer 1 and aluminum fluoride is used as the low refractive index layer 2 in the optically variable flake 10. Etc. are the same as the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption of transmission, that is, the central wavelength of reflection is 580 nm.
The reflected light appeared yellow and the transmitted light appeared violet. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, when the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 25} As the high refractive index layer 1 in the optically variable flakes 10, a mixture of tin oxide and indium oxide (IT
O) and that the low refractive index layer 2 is made of silicon dioxide, the total film thickness of the three-layer thin film, the particle size of the flakes, and the like are the same as those of the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed in the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 26} As the high refractive index layer 1 in the optically variable flakes 10, a mixture of tin oxide and indium oxide (IT
O) and the fact that magnesium fluoride is applied as the low refractive index layer 2, the total film thickness of the three-layer thin film, the particle size of the flakes, and the like are the same as those of the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 27} As the high refractive index layer 1 in the optically variable flakes 10, a mixture of tin oxide and indium oxide (IT
O) and the fact that aluminum fluoride is applied as the low refractive index layer 2, the total film thickness of the three-layer thin film, the particle size of the flakes, and the like are the same as those of the optically variable flakes according to Preparation Example 1.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 28} First, as shown in FIG. 3, the optically variable flakes 10 were prepared by adding the high refractive index layer 1, the low refractive index layer 2, the high refractive index layer 1, the low refractive index layer 2 and the high refractive index layer 1 to each other. A high-refractive index layer 1 was made of zirconium dioxide and a low-refractive index layer 2 was made of silicon dioxide, and the total thickness of the 5-layer thin film was 1.0 μm or less. In addition, the optically variable flakes 10 having a particle size in the range of 2 to 20 μm were applied and dispersed in the vehicle to obtain an optically variable ink.

Next, when the transparent polyester film and the black polyester film on which the ink coating film of the optically variable ink is formed is viewed from the vertical direction, the central wavelength of absorption in transmitted light, that is, The central wavelength of reflection was 580 nm, and the reflected light appeared yellow and the transmitted light appeared blue-violet. At this time, the reflectance of the reflected light is 80
%, And the transmittance in the transmitted light region was 80% or more. On the other hand, when the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

As described above, the reflected light causes a color shift between two or more different colors, and at the same time, the transmitted light has a complementary color relationship with the reflected light at the angular position at that time, and the reflected light is different from the reflected light depending on the viewing angular position. Shifting while maintaining the complementary color relationship caused a color shift between two or more different colors.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 29} The total thickness of the five-layer thin film and the particle size of the flakes except that cerium dioxide is used as the high refractive index layer 1 and cerium fluoride is used as the low refractive index layer 2 in the optically variable flakes 10. Is the same as the optically variable flake according to Preparation Example 28.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of reflected light was 80% or more and the transmittance of the transmitted light region was 80% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility". {Preparation Example 30} Except that titanium dioxide is used as the high refractive index layer 1 and aluminum oxide is used as the low refractive index layer 2 in the optically variable flake 10, It is the same as the optically variable flakes according to Preparation Example 28.

The total thickness of the five-layer thin film and the particle size of the flakes are adjusted except that cerium dioxide is used as the high refractive index layer 1 and cerium fluoride is used as the low refractive index layer 2 in the optically variable flake 10. Identical to the optically variable flakes of Example 28.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared yellow and the transmitted light appeared bluish purple. At this time, the reflectance of the reflected light was 70% or more, and the transmittance of the transmitted light region was 70% or more. On the other hand, film 45
When tilted, the center wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Preparation Example 31} In the optically variable flakes 10, except that zinc sulfide is used as the high refractive index layer 1 and magnesium fluoride is used as the low refractive index layer 2, the total film thickness of the five-layer thin film and the particle size of the flakes. Etc. are the same as the optically variable flakes of Preparation Example 28.

A visible spectrum of reflected light in the black polyester film having the ink coating film formed thereon is shown in FIG. 4, and a visible spectrum of transmitted light in the transparent polyester film having the ink coating film formed thereon is also shown in FIG. When viewed from the direction perpendicular to the ink coating of the polyester film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection was 580 nm, the reflected light appeared yellow and the transmitted light appeared blue-violet. . At this time, the reflectance of reflected light was 80% or more and the transmittance of the transmitted light region was 80% or more. On the other hand, when the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, the reflected light was changed to green and the transmitted light was changed to reddish purple, and the visibility was good.

Table 2 shows the thin film structure of the optically variable ink according to this preparation example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Comparative Example 1} Aluminum oxide (refractive index n = 1.6) is applied as the high refractive index layer 1 and silicon dioxide (refractive index n = 1.5) is applied as the low refractive index layer 2 in the optically variable flakes 10. The particle size of the flakes and the like are the same as those of the optically variable flakes according to Preparation Example 1 except that the total thickness of the three-layer thin film is 0.6 μm or less.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared pale yellow and the transmitted light appeared pale bluish purple. When the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, and the reflected light changed to a light green color and the transmitted light changed to a light reddish purple color. Since the difference in refractive index from the refractive index layer 2 is less than 0.3, the contrast of "complementary color" relation is not clear, and
The "color change" was also unclear and the "visibility" was poor.

Table 3 shows the thin film structure of the optically variable ink according to this comparative example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility".

In this way, the reflected light causes a color shift between two or more different colors, and the transmitted light has a complementary color relationship with the reflected light at the angular position at that time, and the reflected light is different from the reflected light depending on the viewing angular position. A shift occurred while maintaining the complementary color relationship, and a color shift occurred between two or more different colors. However, as described above, the difference in the refractive index between the high refractive index layer 1 and the low refractive index layer 2 is insufficient, so that reflection It was difficult to confirm the color change between light and transmitted light, and the anti-counterfeit / alteration resistance was not good. {Comparative Example 2} Aluminum oxide (refractive index n = 1.6) is applied as the high refractive index layer 1 and silicon dioxide (refractive index n = 1.5) is applied as the low refractive index layer 2 in the optically variable flakes 10. Except for the above, the total film thickness of the five-layer thin film and the particle size of the flakes are the same as those of the optically variable flakes according to Preparation Example 28.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared pale yellow and the transmitted light appeared pale bluish purple. When the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, and the reflected light changed to a light green color and the transmitted light changed to a light reddish purple color. Since the difference in refractive index from the refractive index layer 2 is less than 0.3, the contrast of "complementary color" relation is not clear, and
The "color change" was also unclear and the "visibility" was poor.

Table 3 shows the thin film structure of the optically variable ink according to this comparative example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Comparative Example 3} Titanium dioxide (refractive index n = 2.3) as the high refractive index layer 1 and zirconium dioxide (refractive index n = 2.
1) is applied and the total thickness of the three-layer thin film is 0.6μ
The particle diameter and the like of the flakes are the same as those of the optically variable flakes according to Preparation Example 1 except that the particle diameter is m or less.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed perpendicularly to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared pale yellow and the transmitted light appeared pale bluish purple. When the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, and the reflected light changed to a light green color and the transmitted light changed to a light reddish purple color. Since the difference in refractive index from the refractive index layer 2 is less than 0.3, the contrast of "complementary color" relation is not clear, and
The "color change" was also unclear and the "visibility" was poor.

Table 3 shows the thin film structure of the optically variable ink according to this comparative example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Comparative Example 4} Titanium dioxide (refractive index n = 2.3) as the high refractive index layer 1 and zirconium dioxide (refractive index n = 2.
Except that 1) is applied, the total film thickness of the 5-layer thin film, the particle size of the flakes, and the like are the same as those of the optically variable flakes according to Preparation Example 28.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the direction perpendicular to the ink coating film, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 5
At 80 nm, the reflected light appeared pale yellow and the transmitted light appeared pale bluish purple. When the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, and the reflected light changed to a light green color and the transmitted light changed to a light reddish purple color. Since the difference in refractive index from the refractive index layer 2 is less than 0.3, the contrast of "complementary color" relation is not clear, and
The "color change" was also unclear and the "visibility" was poor.

Table 3 shows the thin film structure of the optically variable ink according to this comparative example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change", and "visibility". {Comparative Example 5} Titanium dioxide (refractive index n = 2.3) is applied as the high refractive index layer 1 and silicon dioxide (refractive index n = 1.5) is applied as the low refractive index layer 2 in the optically variable flake 10. In addition, a reflective layer of aluminum was applied as the third layer instead of the high refractive index layer, and the total thickness of the five-layer thin film was set to 1.0 μm or less. Also, the optically variable flake 10
The particle size of 2 to 20 μm is applied, and
An optically variable ink was prepared by dispersing in the above vehicle.

When the transparent polyester film and the black polyester film on which the ink coating film is formed are viewed from the vertical direction with respect to the ink coating film, the central wavelength of reflection is 580 nm and the reflected light is light yellow. It was visible, but the transmitted light was not visible because it was blocked by the aluminum reflective layer. When the film was tilted by 45 degrees, the central wavelength was shifted to the lower wavelength side, and the reflected light was changed to a light green color, but the transmitted light was not visible because it was blocked by the reflective layer.
The "color change" of the reflected light was clear and the "visibility" was good.

As described above, the reflected light causes a color shift between two or more different colors, but the transmitted light is blocked by the reflective layer and has no complementary color relationship with the reflected light, and the change in color of the transmitted light should be used. I couldn't.

Table 3 shows the thin film structure of the optically variable ink according to this comparative example, the constituent material of each thin film, and the evaluation results of "complementary color", "color change" and "visibility".

[0116]

[Table 1]

[0117]

[Table 2]

[0118]

[Table 3] [Embodiment] Next, a transparent card (information carrier) according to an embodiment of the present invention in which an identification portion is formed by using the optically variable ink of Preparation Example 31 will be described.

That is, this transparent card 50 is shown in FIG.
As shown in (A) to (B), a card base material 51 made of a transparent polyester sheet, and an identification section 52 made of the optically variable ink of Preparation Example 31 provided on the lower right side of the card base material 51. The main portion of the card base 51 is formed, and a character pattern (information pattern) 53 formed of black ink containing a black pigment is provided at a portion of the card base 51 where the identification portion 52 is provided. At the same time, various data as an information carrier (for example, "MEMBER'S CARD") is provided on the other part of the card substrate 51.
Character information) is printed and formed.

Then, the identification portion 52 of the transparent card 50.
When viewed from the vertical direction, the central wavelength of absorption in transmitted light, that is, the central wavelength of reflection is 580 nm, and the reflected light α ₁
Appears yellow, and the transmitted light β ₁ appears bluish-purple which is a complementary color of yellow. At this time, the reflectance of the reflected light α ₁ is 8
The transmittance in the transmitted light region was 0% or more and 80% or more. On the other hand, when the transparent card 50 is tilted by 45 degrees, the central wavelength shifts to the lower wavelength side, the reflected light α ₂ changes color to green, and the transmitted light β ₂ changes to red-purple which is a complementary color of green. changed.

On the other hand, "TOP formed by black ink
The character pattern 53 "OK" was visually recognized through the identification portion 52, and the character pattern 53 was visually recognized even when the reflected light changed in color by tilting the transparent card 50.

Therefore, this transparent card is
The authenticity can be easily determined by confirming the presence or absence of the character pattern 53 "OK" and visually confirming the color change of the reflected light and the transmitted light in the identification section 52.

[0123]

According to the information carrier of the present invention as defined in claims 1 and 3 to 13, the color shift peculiar to the reflected light and the transmitted light peculiar to the identification portion provided on the information carrier are unique. By confirming each color shift, there is an effect that the authenticity of the information carrier can be easily determined.

Further, since it is practically difficult to prepare flakes having the same optical characteristics as the optically variable flakes contained in the optically variable ink which constitutes the above-mentioned identification portion, it is impossible to forge or alter the information carrier. Can be reliably prevented, and
Even if the forgery / alteration is performed, the fact that the forgery / alteration is easily detected can be easily determined by visually observing the difference between the color shift of the reflected light and the color shift of the transmitted light in the identification section. There is.

On the other hand, according to the information carrier according to the inventions of claims 2 and 3 to 13, the information pattern for authenticity determination is provided on the base material at the portion where the identification portion is formed, Since the target of authenticity judgment in the information carrier is the color shift information of the reflected light and transmitted light in the identification section and the above information pattern, the number of judgment targets is increased, so that the forgery / alteration of the information carrier is more reliably prevented. It has the effect that can be done.

[Brief description of drawings]

FIG. 1A is a perspective view of a transparent card (information carrier) according to an embodiment, and FIG. 1B is a cross-sectional view thereof.

FIG. 2 is a cross-sectional view showing optically variable flakes having a three-layer thin film structure prepared in Examples.

FIG. 3 is a cross-sectional view showing optically variable flakes having a five-layer thin film structure prepared in Examples.

FIG. 4 is a graph showing a visible spectrum of reflected light in a black polyester film on which an optically variable ink coating film according to Preparation Example 31 is formed.

FIG. 5 is a graph showing a visible spectrum of transmitted light in a transparent polyester film on which an optically variable ink coating film according to Preparation Example 31 is formed.

[Explanation of symbols]

 1 High Refractive Index Layer 2 Low Refractive Index Layer 10 Optically Variable Flakes 50 Transparent Card (Information Carrier) 51 Card Base Material 52 Identification Part 53 Character Pattern (Information Pattern)

Claims (13)

[Claims] 1. Identification for authenticity determination formed by an optically variable ink containing optically transmissive optically variable flakes that causes a color shift between two or more different colors depending on the angle of incident light. An information carrier, wherein the portion is provided at an arbitrary position on the base material, and at least a portion of the base material on which the identification portion is formed is light transmissive. 2. The information carrier according to claim 1, wherein an information pattern for authenticity determination is provided on a portion of the base material where the identification portion is formed. 3. The optical variable flakes have optical characteristics that the reflectance in the reflected light region is 50% or more and the transmittance in the transmitted light region is 50% or more. Information carrier described. 4. The optical variable flakes have optical characteristics such that the reflectance in the reflected light region is 70% or more and the transmittance in the transmitted light region is 70% or more. Information carrier described. 5. The information carrier according to claim 1, wherein the optically variable flakes have a multilayer thin film structure. 6. The information carrier according to claim 5, wherein the total thickness of the multilayer thin films is less than 1.2 μm. 7. The information carrier according to claim 5, wherein the total thickness of the multilayer thin films is 0.6 μm or less. 8. The information carrier according to claim 5, wherein the total number of the multilayer thin films is 2 to 5. 9. The information carrier according to claim 5, wherein the multilayer thin film structure is composed of high refractive index layers and low refractive index layers which are alternately arranged. 10. The information carrier according to claim 9, wherein the difference in refractive index between the high refractive index layer and the low refractive index layer is 0.3 or more. 11. The information carrier according to claim 9, wherein the high refractive index layer and the low refractive index layer are made of a ceramic material. 12. A ceramic in which the high refractive index layer is selected from titanium dioxide, zirconium dioxide, zinc sulfide, cerium dioxide, zinc oxide, tantalum oxide, indium oxide, tin oxide, and a mixture of tin oxide-indium oxide. The information carrier according to claim 9, which is made of a material. 13. The low refractive index layer is made of a ceramic material selected from magnesium fluoride, calcium fluoride, cerium fluoride, aluminum fluoride, silicon dioxide, aluminum oxide, magnesium oxide, and magnesium fluoride. The information carrier according to claim 9, wherein the information carrier is provided.