JPH06286367A - Display body and method for judging its genuineness - Google Patents

Abstract

PURPOSE:To provide a display body wherein a color of image visible from the normal direction of image under white light and a color of image visible from an angle different from the normal direction are different from each other, and provide a method for judging whether the display body is true one or not at a glance and judging genuineness of it mechanically as well. CONSTITUTION:A display body has, on a base material, images made of a colorant 2 consisting of a light reflecting metallic foil and a transparent material having high refractive index provided on the surface of the foil. For the colorant 2, a colorant wherein a color of image visible from the normal direction of image under white light and a color of image visible from an angle different from the normal line are different from each other is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display such as a card or a sheet on which an image is formed on a base material, and particularly to a color of an image visually recognized from a normal direction of the image under a white ray. The present invention relates to a display body in which the color of an image visually recognized from different angles with respect to a normal direction is different, and a method for determining the authenticity of the display body.

[0002]

2. Description of the Related Art In recent years, cards have come to be widely used commercially, for example, as credit cards, cash cards, etc., and as ID cards etc. for security management. There are many cases of abuse. Conventional cards have images such as designs, visible information such as letters and numbers, and embossed characters on the surface of the card base, and magnetic recording is added to increase the amount of information and mechanize the use of the card. In order to further increase the amount of information, an IC card having an IC chip such as a memory and an optical card for optical recording have come to appear.

In particular, commercial cards are required to have excellent design and appearance in addition to security management, and various designs have been adopted.
However, although high-level security technologies such as IC cards have emerged, in reality, card handling is performed visually by a card operator to facilitate the creation of a fake person, and especially the card design is more sophisticated. On the other hand, improvements in printing technology make it easier to create fake people, making visual discrimination, especially instantaneous discrimination, difficult.

Therefore, in order to prevent forgery, various technical measures such as encryption of magnetic data, printing by fluorescence, printing of micro characters, sticking of hologram, use of paper panel, adoption of indentation, etc. are taken. Has been taken.

[0005]

As described above, at present, it is difficult to determine whether or not the display body is genuine at first glance, and it has an image that enables this determination. There has never been a display such as a card. The present invention has been made to solve the above problems, and an image viewed from a different angle with respect to the color of the image viewed from the normal direction of the image under a white ray and the normal direction. The first object of the present invention is to provide a display body that is different from the color of and can judge whether or not the display body is genuine at first glance, and also makes a true / false determination mechanically. A second object is to provide a method for determining the authenticity of a display capable of performing the above.

[0006]

In order to achieve the above object, first, in the invention described in claim 1, a light-reflecting metal foil and a high-refractive-index transparent film provided on the surface thereof are provided on a substrate. In a display body having an image formed of a coloring material composed of a material, the coloring material is visually recognized from a direction normal to the image under a white ray at a different angle with respect to the color of the image and the direction normal to the image. It is a coloring material that differs from the color of the image.

According to the second aspect of the invention, the substrate has an image formed of a coloring material composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface of the light-reflecting metal foil. The image is formed with a coloring material in which the color of the image visually recognized from the normal direction of the image under a white ray and the color of the image visually recognized from a different angle with respect to the normal direction are formed by different coloring materials, and the surface of the image is It is composed of a plurality of sets of line-shaped corrugated concavo-convex pattern groups, each of which is changed in various directions.

Here, the above-mentioned coloring material composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface thereof,
It is in the form of small pieces and is mixed with printing ink. Also,
The angle different from the normal direction is 30 to 70.
Is the angle in degrees. Further, in the invention according to claim 5,
A display unit for setting and correlating a correlation between an incident angle of irradiation light having one or more specific wavelengths and its reflectance with respect to an image formed on the display unit according to claim 1 or 2. The formed image is irradiated with irradiation light having a specific wavelength at a predetermined incident angle, and the correctness of the display is determined based on the correlation between the reflectance and the incident angle obtained at the specific wavelength.

Here, the correctness of the display body at a plurality of specific wavelengths is determined.

[0010]

Therefore, in the display body according to the first aspect of the invention, as a coloring material, it is visually recognized from a different angle with respect to the color of the image and the normal direction of the image viewed under the white ray. By using a coloring material having a color different from that of the image, the color of the reflected light changes depending on the visual direction, and thus it is possible to easily make a visual determination as to whether the image is true or false.

Further, in the display body according to the second aspect of the present invention, the image is viewed under a white ray from the direction of the normal line of the image and the image viewed from different angles with respect to the normal line direction. Is formed of a coloring material having a different color from that of the image, and the surface of the image is composed of a plurality of sets of linear wavy uneven patterns, and the wavy uneven patterns are formed by changing in various directions of the wavy uneven patterns. The angle of the light reflected from the coloring material changes without tilting the card, and the color changes in the part of the image, and the color change of the image also occurs by changing the angle of the display body. Authenticity can be easily determined.

Furthermore, in the authenticity determination method for a display body according to a fifth aspect of the present invention, an incident angle of irradiation light having one or more specific wavelengths and a reflectance thereof with respect to an image formed on the display body. Each of the correlation with and set, irradiating the image formed on the display with irradiation light of a specific wavelength at a predetermined incident angle,
By determining the correctness of the display based on the correlation between the reflectance and the incident angle obtained at the specific wavelength, it is possible to easily determine the authenticity by the machine.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing a configuration example of a card which is a display body according to the present invention, and FIG. 2 is a plan view showing a configuration example of the card. That is, as shown in FIG. 1 and FIG. 2, the card of the present example is composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface of the base material 1, and under the white light beam. At different angles with respect to the color of the image visually recognized from the normal direction of the image and the normal direction (in this example, 3
The colored layer 2 on which a predetermined image is formed by a coloring material having a color different from the color of the image viewed from an angle of 0 to 70 degrees) is provided,
Further, the background printing layer 3 is provided around the coloring layer 2 by using a printing ink having the same color as that seen when the coloring layer 2 is viewed from the normal direction.

Here, as the coloring layer 2, there is used one in which a small-sized coloring material composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface thereof is mixed with the printing ink. can do. Specifically, for example, a material obtained by coating aluminum with a metal oxide can be used. Further, as the other substances constituting the ink used for the colored layer 2, for example, the following substances can be used.

(Binder) Salt vinyl acetate resin, saturated polyester, polyurethane elastomer, etc. This binder is contained in the printing ink composition excluding the solvent in an amount of 20% by weight or less. (Solvent) Toluene, methylisobutylene, xylene, cyclohexanol, isobutyl acetate, cyclocyhexanone, methylcyclocyhexanone, glycol derivatives such as ethylene glycol monobutyl ether, or a mixed solvent thereof.

In the card of the present embodiment constructed as described above, the color of the image visually recognized from the normal direction of the image under the white ray and the visible direction from the angle of 30 to 70 degrees with respect to the normal direction. Since the colored layer 2 is formed using a coloring material having a color different from that of the image, the color of the reflected light changes depending on the visual direction. Therefore, it is possible to easily make a visual determination as to whether the image is true or false.

That is, when the card is viewed from the front, the colored layer 2 looks red, for example, and the angle at which the card is viewed is changed (for example, when viewed from an angle of 45 degrees with respect to the card).
The colored layer 2 looks green, for example. As a result, when the color of the background printing layer 3 is red and the color of the card is red, when the card is viewed from the front, the entire card looks like a solid red color. When viewed from an angle of 45 degrees), the color changes, and the colored layer 2 portion looks green.

Therefore, the authenticity of the card can be easily judged visually. On the other hand, by utilizing the change in color depending on the viewing angle of the colored layer 2 portion, the angle of the card can be changed to read the spectral characteristics, and the authenticity of the card can be easily determined by a machine. That is, by utilizing the fact that the spectral characteristics change depending on the incident angle of light to the colored layer 2, the incident angle of irradiation light of one or more specific wavelengths with respect to the image of the colored layer 2 formed on the card Correlation with the reflectance is set respectively, and the image of the colored layer 2 formed on the card is irradiated with irradiation light of a specific wavelength at a predetermined incident angle. By determining whether the display body is correct or not based on the correlation, it can be determined that the image is formed by the coloring layer 2 using the coloring material of this embodiment. Therefore, it is possible to easily determine the authenticity by the machine.

For example, as shown in FIG. 3, 600 nm and 700 nm are used as specific wavelengths, and the light source is tilted at 45 degrees (green) and the light source is tilted at 0 degree (red). The reflectance of light at the wavelength is measured and the reflectance is obtained. And the angle of the light source with respect to the card (4
By correlating the reflectance at a specific wavelength (600 nm, 700 nm) with 5 °, 0 °), the authenticity of the card in the colored layer 2 can be determined.

In this way, a specific angle (45 degrees, 0
Reflected light (600 nm: green, 700 n)
Depending on whether or not (m: red) is obtained, it can be determined that the image is formed by the coloring layer 2 using the coloring material of this embodiment. Next, using the actual measurement data shown in FIG. 4, regarding the correlation between the incident angle of the irradiation light having the specific wavelength and the reflectance thereof, that is, the color change depending on the incident angle of the irradiation light,
This will be described more specifically.

As a measurement sample, a screen ink of “GOLD-GREEN” type was used among the three kinds of coloring materials, and a solid coating of about 6 μm was formed on a white vinyl chloride (center core). FIG. 4 shows the spectral characteristics of the measurement sample when the angle of the light source for irradiation is changed. From this data, it can be seen that the wavelength at which the peak of reflection appears changes by changing the incident angle of light with respect to the coloring material. For example, when the incident angle of light with respect to the coloring material is 0 degree, the reflection peak appears near 600 nm, and when the incident angle of light with respect to the coloring material is 45 degrees, the reflection peak appears around 530 nm. The peak appears.

When the authenticity of a coloring material is judged by a machine, it is possible by irradiating light of two specific wavelengths while changing the incident angle with respect to the coloring material and observing the relationship of the light reflectance at that time. Become. Now, the wavelength of the incident light is 610 nm and 550 n
Assuming that m is the incident angle of light with respect to the coloring material and 0 ° and 30 °, 55% when the incident angle of light is 0 ° when the coloring material is irradiated with light having a wavelength of 610 nm. The light is reflected to a degree of about 35% when the incident angle of the light is 30 degrees. Further, when the coloring material is irradiated with light having a wavelength of 550 nm, about 24% of the light is reflected when the incident angle of light is 0 degree, and about 34% is reflected when the incident angle of light is 30 degrees. .

Therefore, if the colorant is irradiated with light having a wavelength of 610 nm and the reflectance of light is divided by 45%, the reflectance when the incident angle of light is 0 degree is compared with the divided value. When the incident angle of light is 30 degrees, the reflectance becomes lower than the divided value. Also, if the wavelength is 5
The reflectance of light when the colorant is irradiated with 50 nm light is 2
If it is divided into 9%, if the incident angle of light is 0 degree,
The reflectance becomes lower than the divided value, and becomes higher than the divided value when the incident angle of light is 30 degrees.

That is, when the colorant is irradiated with light having a wavelength of 610 nm, when the light reflectance is divided by 45%, the light incident angle is high at 0 degrees and the light incident angle is at 30 degrees. Was low, but when the colorant was irradiated with light having a wavelength of 550 nm, when the light reflectance was divided by 29%,
When the incident angle of light is 0 degree, it is low.
If the degree is 6 degrees, the wavelength becomes 6
This is the opposite of the case of irradiation with 10 nm light.

On the other hand, in the case of ordinary ink, the shape of the spectral characteristics does not change even if the incident angle of light changes, so that there is no reversal at a wavelength where the reflectance of light is high or low depending on the incident angle of light. Therefore, for example, by setting the colorant under the following conditions, it is possible to determine the authenticity of the coloring material by a machine, and it is possible to determine the authenticity of the coloring material using the machine. Become.

(A) When the light having a wavelength of 610 nm is irradiated, if the light reflectance is divided by 45%, the light incident angle becomes 0.
When the angle of incidence of light is 30 degrees, the reflectance of light is high. (B) When the light having a wavelength of 550 nm is irradiated and the light reflectance is divided by 29%, the light reflectance is low when the incident angle of light is 0 degree and the incident angle of light is 30 degrees. Has a high light reflectance.

As described above, the card of this embodiment is composed of the light-reflecting metal foil and the high-refractive-index transparent material provided on the surface of the base material 1, and the method of forming an image under white light rays. 30 with respect to the color of the image visually recognized from the line direction and the normal direction
A colored layer 2 on which a predetermined image is formed by a coloring material having a color different from that of an image viewed from an angle of 70 degrees is provided, and the colored layer 2 is viewed around the colored layer 2 in the normal direction. When the background printing layer 3 is provided with the printing ink having the same color as the color that is sometimes seen, and when the authenticity of the card is determined, one for the image of the coloring layer 2 formed on the card The correlation between the incident angle of the irradiation light having the specific wavelength and the reflectance thereof is set, and the image of the coloring layer 2 formed on the card is irradiated with the irradiation light having the specific wavelength at the predetermined incident angle to obtain the specific wavelength. Whether or not the display body is correct is determined based on the correlation between the reflectance and the incident angle obtained in.

Therefore, since the color of the reflected light changes depending on the visual direction, it is possible to easily determine the authenticity by the visual sense, and it is possible to enhance the effect of preventing forgery and falsification of the card. That is, in this embodiment, the background printing layer 3 made of the printing ink having the same color as the color seen when the coloring layer 2 is viewed from the front (0 degree) is provided around the coloring layer 2, and it is noticeable. However, since the color of the reflected light from the tilted position is different, the discrimination becomes easier, and the authenticity of the card can be discriminated.

Further, with respect to the image of the coloring layer 2 formed on the card, the correlation between the incident angle of the irradiation light having one or more specific wavelengths and the reflectance thereof is set, and the coloring formed on the card is determined. The image of the layer 2 is irradiated with irradiation light of a specific wavelength at a predetermined incident angle, and the correctness of the display is determined based on the correlation between the reflectance and the incident angle obtained at the specific wavelength.
It becomes possible to easily determine the authenticity by the machine.

As described above, it is possible to enhance the effect of preventing forgery and tampering of the card. Next, another embodiment of the present invention will be described. FIG. 5 is a plan view showing another configuration example of a card which is a display body according to the present invention, and the same elements as those in FIGS. 1 and 2 are designated by the same reference numerals.

That is, as shown in FIG. 5, the card of this embodiment is composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface of the base material 1, and the At different angles with respect to the color of the image visually recognized from the normal direction of the image and the normal direction (in this example, an angle of 30 to 70 degrees)
The coloring layer 2 on which a predetermined image is formed by a coloring material having a color different from that of the image visually recognized from the
The surface of the image is composed of a plurality of sets of parallel wavy corrugated pattern groups 4 and is configured to be changed in various directions of the parallel wavy corrugated pattern group 4.

Here, as a specific method of forming the linear wavy uneven pattern group 4, for example, a pattern formed by the linear wavy uneven pattern group is blank-pressed on the image of the colored layer 2 to form a pattern. To form. In this case, the pattern of the mold is arbitrary, and for example, a checkered pattern, a specific mark, a design, etc. can be considered.

In the card of this embodiment constructed as described above, the image is visually recognized from the normal direction of the image under the white ray and the visual angle is visually recognized from the angle of 30 to 70 degrees with respect to the normal direction. The color of the image to be formed is formed of a coloring material different from that of the image, and the surface of the image is composed of a plurality of sets of linear wavy uneven pattern groups, each of which changes in various directions. The angle of the light reflected from the colored layer 2 changes without tilting the card due to the corrugated concavo-convex pattern, resulting in a change in color in a part of the image. In addition, changing the angle of the card also changes the color of the image. Therefore, it is possible to easily determine whether the card is authentic or not, and it is possible to further enhance the effect of preventing counterfeiting or falsification of the card.

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below. (A) In each of the above embodiments, the case where the colored layer 2 is formed with a normal image has been described, but the present invention is not limited to this. For example, as shown in FIG. 6 or FIG. 2 such as bar code or carla code
Even if formed with a dimensional code, as in the case described above, the authenticity of the Carla code is determined by whether or not the reflected light is obtained at a specific angle, and by reading the data of the code itself, the code It is possible to further improve the security.

Further, in this case, as in the case described above, background printing is performed around the colored layer 5 forming the code by using the printing ink having the same color as the color seen when the colored layer 5 is viewed from the front. You may make it provide a layer. (B) In the embodiment shown in FIGS. 1 and 2, the coloring layer 2 is used.
It is also possible to form the portion of No. 2 by a normal printing ink and form the surrounding portion of the background printing layer 3 by the coloring layer using the coloring material of this embodiment described above.

(C) In each of the above embodiments, as the coloring layer 2, as described above, a small piece of coloring material composed of the light-reflecting metal foil and the high refractive index transparent material provided on the surface thereof. The case where the colored layer 2 is formed by mixing with the printing ink has been described, but the present invention is not limited to this, and the colored layer 2 may be formed from the light reflective metal foil and the high refractive index transparent material provided on the surface thereof in the surface layer. You may

(D) In each of the above embodiments, the case where the present invention is applied to a card has been described. However, the present invention is not limited to this, and the same effects can be obtained by applying the present invention in the same manner. is there. (E) In each of the above-described embodiments, the angle different from the normal direction is 30 to 70 degrees, but the angle is not limited to this.

[0038]

As described above, according to the present invention, the color of an image visually recognized from a normal direction of an image under a white ray and the color of an image visually recognized from a different angle with respect to the normal direction. Differently, it is possible to provide a display body capable of determining whether or not the display body is genuine at first glance, and also it is possible to mechanically determine whether the display body is true or false. Can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a card which is a display according to the present invention.

FIG. 2 is a plan view showing a configuration example of a card according to the same embodiment.

FIG. 3 is a schematic diagram for explaining a method of determining the authenticity of a card in the embodiment.

FIG. 4 is a characteristic diagram showing an example of actual measurement data regarding a correlation between an incident angle of irradiation light of a specific wavelength and its reflectance in the same example.

FIG. 5 is a plan view showing another embodiment of a card which is a display body according to the present invention.

FIG. 6 is a plan view showing another embodiment of a card which is a display body according to the present invention.

FIG. 7 is a plan view showing another embodiment of a card which is a display body according to the present invention.

[Explanation of Codes] 1 ... Substrate, 2 ... Colored layer, 3 ... Background printed layer, 4 ... Line-shaped corrugated concavo-convex pattern group, 5 ... Colored layer.

Claims (6)

[Claims] 1. A display body having an image formed on a base material with a colorant composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface thereof, wherein the colorant comprises: A display body, wherein a color of an image visually recognized from a normal direction of an image under a white ray and a color of an image visually recognized from a different angle with respect to the normal direction are different coloring materials. 2. An image formed by a coloring material composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface of the base material is provided, and the image is an image under white light rays. The color of the image viewed from the normal direction and the color of the image viewed from different angles with respect to the normal direction are formed of different coloring materials, and the surface of the image has a linear wavy pattern group. A display body, characterized in that the display body is composed of a plurality of sets of the above, and each is changed in various directions of a corrugated corrugated pattern group. 3. The coloring material composed of a light-reflecting metal foil and a high-refractive-index transparent material provided on the surface of the foil is in the form of a small piece, and is mixed with a printing ink. Item 3. The display according to item 1 or 2. 4. The display body according to claim 1, wherein an angle different from the normal direction is 30 to 70 degrees. 5. A correlation between an incident angle of irradiation light having one or more specific wavelengths and its reflectance is set for each of the images formed on the display body according to claim 1 or 2. , Irradiating the image formed on the display to be collated with irradiation light of a specific wavelength at a predetermined incident angle, and determining the correctness of the display based on the correlation between the reflectance and the incident angle obtained at the specific wavelength. A method for determining the authenticity of a display body, which is characterized in that 6. The authenticity determination method for a display body according to claim 5, wherein whether the display body is correct or not at a plurality of specific wavelengths is determined.