JP2002274001A - Image recording medium and method for discriminating truth and falsehood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image recording medium having excellent forgery and alteration preventiveness and a method for discriminating truth and falsehood. SOLUTION: The image recording medium 1 comprises an information carrying layer 11 having identification information and image information 12 recorded therein, and at least two types of flaky power-containing layer having different color changing reflecting angles. The method for discriminating the truth and the falsehood comprises the steps of irradiating parts of the power-containing layer of the medium 1 having at least the carrying layer 11 recording the identification information and the image information 12 and except the power- containing layer from a light source of a predetermined direction, comparing a spectral reflectivity obtained by observing reflected lights of two directions including at least a front reflecting angle with that of the part except the power- containing layer, and discriminating the truth and the falsehood according to a difference of the reflectivities in predetermined wavelengths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a contact-type or non-contact type electronic or magnetic card or sheet for storing personal information or the like for which security (security) such as forgery and alteration prevention is required. The present invention also relates to a preferable image recording medium and a method of determining authenticity.

[0002]

2. Description of the Related Art In recent years, in the service industries such as banks, companies, schools, and government offices, contact or non-contact electronic or magnetic cards are often issued. Cash cards, employee cards, employee cards, membership cards, student cards, alien registration cards, and various licenses used in these fields are recorded with personal information and cannot be easily forged or altered. Has been security-treated.

[0003]

As an example of such a process, forgery / falsification prevention technology in which a color changing layer whose color changes depending on the viewing angle has become widespread in order to prevent forgery / falsification at low cost. Such a color changing layer is, for example,
It is formed by printing with a color changing ink, such as pearl ink, whose color changes depending on the viewing angle. Such a color-changing ink contains a pigment that multiply reflects light, and the color appears to change due to interference of light reflected by the pigment.

[0004] For example, Japanese Unexamined Patent Publication No. Hei 6-28667 proposes a method for determining the authenticity of a variable-angle discoloration material. However, if there is a scale pigment-containing layer on the outermost surface, the reflectance changes depending on the surface condition, or if a protective layer is provided on the scale pigment-containing layer, the spectral reflectance changes or the true / false discrimination property is increased. Not enough.

[0005] In addition, in the case of having a counterfeit deterrent effect by a copy or a scanner, etc., for a highly forged one, it is necessary to judge authenticity by visually judging color judgment and glossiness. It was not enough for simple concentration measurement.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide an image recording medium excellent in anti-counterfeiting and forgery and a method of determining authenticity.

[0007]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to the first aspect of the invention, there is provided an image recording medium having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer and having different colors depending on the reflection angle. At least two different angles
An image recording material comprising a kind of flaky powder-containing layer. ].

According to the first aspect of the present invention, at least two types of scale-like powder-containing layers differ in color depending on the reflection angle, and can more reliably prevent forgery and falsification.

According to a second aspect of the present invention, there is provided an image recording medium having at least an information-bearing layer on which identification information and image information are recorded and a flaky powder-containing layer. And 10 for the specular reflection angle
The color changes in different reflection angle ranges from not less than 45 ° and not more than 45 °,
And an image recording body characterized in that the color is different from the color of an area other than the flaky powder-containing layer. ].

According to the second aspect of the present invention, the color changes in the reflection angle range by the flaky powder-containing layer, and also differs from the color of the region other than the flaky powder-containing layer, thereby more surely forging and falsifying. Can be prevented.

According to a third aspect of the present invention, there is provided an image processing apparatus comprising: “When the color of reflected light is represented by an L ^* a ^* b ^* color system in a reflection angle range different from the regular reflection light angle by 10 ° or more and 45 ° or less, 3. The image recording medium according to claim 1, wherein the a ^* value and the b ^* value are reversed in the reflection angle range. ].

According to the third aspect of the present invention, the a ^* value and the b ^* value are reversed in the reflection angle range, and the color is different depending on the reflection angle, thereby making it possible to more reliably prevent forgery and falsification.

According to a fourth aspect of the present invention, there is provided an image processing apparatus, comprising: "When the color of the reflected light at the specular reflection angle is represented by an L ^* a ^* b ^* color system, a ^*
2. A scaly powder-containing layer region where b ^* > b ^* and a scaly powder-containing layer region where a ^* <b ^*.
Or the image recording medium according to claim 2. ].

According to the invention described in claim 4, a ^*
There are a flaky powder-containing layer region of> b ^* and a flaky powder-containing layer region of a ^* <b ^* , and the color differs depending on the reflection angle, thereby making it possible to more reliably prevent forgery and falsification.

According to a fifth aspect of the present invention, there is provided an image processing apparatus comprising:
The image recording body according to any one of claims 1 to 4, wherein m or less micro characters are provided. ].

According to the fifth aspect of the present invention, forgery and falsification can be more reliably prevented by providing micro-characters.

According to a sixth aspect of the present invention, there is provided a method according to any one of the first to fifth aspects, wherein the fluorescent coloring layer or the infrared coloring layer is provided so as to at least overlap with the flaky powder-containing layer. Item 2. The image recording medium according to item 1. ].

According to the invention described in claim 6, when the fluorescent coloring layer or the infrared coloring layer at least overlaps with the flaky powder containing layer, the color changes between the overlapping portion and the non-overlapping portion. Forgery and forgery can be prevented more reliably.

According to a seventh aspect of the present invention, there is provided an image recording medium according to any one of the first to sixth aspects, wherein the transparent protective layer is provided on the outermost layer. ].

According to the seventh aspect of the present invention, the protective layer is protected by the transparent protective layer provided on the outermost layer.

According to the invention described in claim 8, the personal information such as face image, address, name, date of birth, etc. is described as the identification information. Or the image recording material according to item 1. ].

According to the invention described in claim 8, the card can be used as an individual authentication card such as a cash card, an employee card, an employee card, a member card, a student card, an alien registration card and various licenses.

According to a ninth aspect of the present invention, there is provided a method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer. And irradiating a portion other than the scaly powder-containing layer from a light source in a certain direction and including at least a specular reflection angle 2
Spectral reflectance obtained by observing the reflected light in the direction and the spectral reflectance of the portion other than the flaky powder-containing layer are compared, and authenticity is determined based on a difference in reflectance at a predetermined wavelength. Judgment method. ].

According to the ninth aspect, the authenticity can be reliably determined based on the difference in reflectance at a predetermined wavelength.

According to a tenth aspect of the present invention, there is provided a method for binarizing a spectral reflectance waveform obtained by observing reflected light in at least two directions including at least a specular reflection angle, and performing spectral analysis on portions other than the flaky powder-containing layer. The authenticity determination method according to claim 9, wherein the reflectance waveform is binarized, the respective waveforms are compared, and the authenticity is determined based on a difference in reflectance at a predetermined wavelength. 』
It is.

According to the tenth aspect of the present invention, the spectral reflectance waveforms are binarized and compared, so that the authenticity can be reliably determined based on the reflectance difference at a predetermined wavelength. .

The invention according to claim 11 is a method for judging the authenticity of an image recording medium having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer,
The scaly powder-containing layer is irradiated from a light source in a certain direction, and the colors in at least two directions including the regular reflection angle are measured, and the colors of the regular reflection light and the reflection angles other than the regular reflection light are L ^* a ^* b ^*. When represented in a color system, the reflection angle at which the a ^* value b ^* value is reversed,
A true / false judgment method characterized by performing a true / false judgment with a predetermined a ^* b ^* value. ].

According to the eleventh aspect of the present invention, a
^* A reflection angle value b ^* value is reversed, it is possible to reliably perform authenticity determination at a predetermined a ^* b ^* values.

According to a twelfth aspect of the present invention, there is provided a method for judging the authenticity of an image recording medium having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer and having different colors depending on the reflection angle. Then, the scale-like powder-containing layer is irradiated from a light source in a certain direction, and a spectral reflectance waveform obtained by observing reflected light in at least two directions including angles at which specular reflection angle and color are different is binarized based on a predetermined standard, and the reflection angle is calculated. A true / false judgment method characterized in that a true / false judgment is made by correlating a spectral reflectance waveform of reflected light with a reflection angle having a different color. 』
It is.

According to the twelfth aspect of the present invention, the binarized spectral reflectance waveform of the reflected light at the reflection angle,
By correlating the reflection angles having different colors, the authenticity can be reliably determined.

According to a thirteenth aspect of the present invention, there is provided an image recording medium having at least one fluorescent coloring layer and one infrared coloring layer,
The light source irradiates with a light source in an ultraviolet region and an infrared region in addition to a visible light region, and the color, spectral reflectance, or color of each reflected light in the visible light, ultraviolet light region, and infrared light region is true at different reflection angles. 13. The method according to claim 9, wherein a false determination is performed. ].

According to the thirteenth aspect of the present invention, it is possible to reliably determine the authenticity of the reflected light in the visible light, the ultraviolet light region, and the infrared light region at different reflection colors or at different reflection angles. It can be carried out.

According to a fourteenth aspect of the present invention, there is provided a method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer,
The scaly powder-containing layer is subjected to image processing of a scaly powder image photographed with an optical microscope on a predetermined color basis, and the authenticity is determined based on the color basis and the existence ratio per unit area of the image-processed scaly powder. Characteristic judgment method. ].

According to the fourteenth aspect of the present invention, the authenticity can be reliably determined based on the color standard and the existence ratio of the image-processed flaky powder per unit area.

According to a fifteenth aspect of the present invention, there is provided a method according to the first aspect, wherein the scaly powder-containing layer is irradiated with at least
The image is taken with an optical microscope at two reflection angles, the flaky powder image at each reflection angle is image-processed with a predetermined color reference, and the authenticity is determined based on the color reference and the reflection angle. The authenticity determination method described in the above. ].

According to the fifteenth aspect, the flaky powder image at the reflection angle can be image-processed based on a predetermined color standard, and the authenticity can be reliably determined based on the color standard and the reflection angle.

The invention according to claim 16 is characterized in that "the scale-like powder-containing layer is irradiated from a light source in a certain direction,
Photographed by an optical microscope at two reflection angles, image processing of the flaky powder image at each reflection angle is performed based on a predetermined color standard, and authenticity is determined based on the color standard and the existence ratio of the image-processed flaky powder per unit area. The authenticity determination method according to claim 14, wherein ].

According to the sixteenth aspect of the present invention, the authenticity can be reliably determined based on the color standard and the ratio of the image-processed flaky powder per unit area.

The invention according to claim 17 is characterized in that "the scaly powder image is binarized based on a predetermined color standard, and the authenticity is determined based on the color standard and the existence ratio per unit area. An authenticity determination method according to claim 14 or 16. ].

According to the seventeenth aspect of the invention, the authenticity can be reliably determined based on the color reference and the existence ratio per unit area.

The invention according to claim 18 is based on the invention that "the scaly powder-containing layer is irradiated from a light source in a certain direction, and the scaly powder image photographed by an optical microscope is binarized based on at least two or more colors. The image processing is performed.
A method for determining the authenticity according to claim 16. ].

According to the eighteenth aspect of the present invention, by performing image processing for binarizing the scale-like powder image based on at least two or more colors, the authenticity can be reliably determined.

According to a nineteenth aspect of the present invention, there is provided an image recording apparatus according to any one of the ninth to eighteenth aspects, wherein the image recording body is the image recording body according to any one of the first to eighth aspects. Method for determining the authenticity described in the section. ].

According to the nineteenth aspect, it is possible to reliably determine the authenticity of an image recording medium having a different color depending on the reflection angle.

According to a twentieth aspect of the present invention, there is provided an image recording medium having at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer, at least partially overlapping the flaky powder-containing layer. Provide a transparent high-refractive-index resin layer so that the angle at which the reflection angle at which the color changes by irradiating from a light source in a certain direction, on the flaky powder-containing layer,
An image recording medium, which is different from the above-mentioned scaly powder-containing layer overlapping the transparent high refractive index resin layer. ].

According to the twentieth aspect, the angle at which the reflection angle at which the color changes when irradiated from a light source in a certain direction overlaps the scale-like powder-containing layer and the transparent high refractive index resin layer. By being different from the flaky powder containing layer that is
Forgery and falsification can be prevented more reliably.

According to a twenty-first aspect of the present invention, there is provided an image recording medium according to the twentieth aspect, wherein a transparent protective layer is provided. ].

According to the twenty-first aspect of the present invention, the protective layer is protected by the transparent protective layer provided on the outermost layer.

According to a twenty-second aspect of the present invention, a transparent high refractive index resin layer is provided so as to overlap at least a part of the flaky powder-containing layer and at least a part of the flaky powder-containing layer described in the image recording medium. A method for determining the authenticity of an image recording medium,
A true / false determination method, wherein a true / false determination is performed based on a reflected light angle emitted from a light source in a certain direction in each region and a color of each region at the reflected light angle. ].

According to the twenty-second aspect of the present invention, the transparent high-refractive-index resin layer overlaps at least a part of the flaky powder-containing layer and at least a part of the flaky powder-containing layer described in the image recording medium. Can be reliably determined for the image recording medium provided with the mark.

[0052]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image recording medium and an authenticity discrimination method according to the present invention will be described below in detail with reference to the drawings.

First, an example of the image recording body is shown in FIG.

FIG. 1 is a sectional view of an image recording medium. The image recording medium 1 of this embodiment has an information carrying layer 1 on a substrate 10.
1 is provided. Identification information and image information 12 are recorded on the information carrying layer 11. Further, the information carrying layer 11
On the top, a background 13 and scales 14 and 15 are provided, a character 16 is provided so as to overlap the background 13 and the scale 14, a character 17 is provided so as to overlap the background 13 and the scale 15, and the transparent protective layer 18 is provided. Is provided on the outermost layer. Scales 14, 15
Are at least two types of flaky powder-containing layers having different reflection angles at which colors change, and the image recording body 1 has different colors depending on the reflection angles.

Further, personal information such as a face image, an address, a name, a date of birth, and the like are described as identification information. This image recording medium 1 includes a cash card, an employee card, an employee card, a membership card, a student card, Used as a personal authentication card for alien registration cards and various licenses.

FIG. 2 is a diagram showing the appearance when the image recording body is arranged perpendicular to the line of sight, and FIG. 3 is a diagram showing the appearance when the image recording body is arranged at an angle of 50 ° with respect to the line of sight. The color of the image recording medium 1 differs depending on the reflection angle.

The image recording medium 1 irradiates the scales 14 and 15 from a light source in a certain direction, changes the color in a reflection angle range different from the regular reflection light angle by 10 ° or more and 45 ° or less, and changes the color of the scales 14 and 15. It is also different from the color of the region other than 15. This image recording body 1 is provided with a micro character 20 having a long side of 0.5 mm or less.

FIG. 4 is a sectional view of another embodiment of the image recording medium. In the image recording medium 1 of this embodiment, the same components as those of the embodiment of FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted. The image recording medium 1 of this embodiment is
The fluorescent coloring layer 30 overlaps the scale 14 and the infrared coloring layer 31 overlaps the scale 15.

FIG. 5 is a sectional view of another embodiment of the image recording body. In the image recording medium 1 of this embodiment, the same components as those of the embodiment of FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted. The image recording medium 1 of this embodiment is
A background 32 and transparent high-refractive-index resin layers 33 and 34 are provided so as to overlap the background 13 and the scales 14 and 15. The transparent high refractive index resin layer 33 overlaps a part of the scale 14, and the transparent high refractive index resin layer 34 overlaps a part of the scale 15.

As described above, the transparent high-refractive-index resin layers 33 and 34 overlap at least a part of the scales 14 and 15.
And the angles at which the reflection angles at which the color changes when illuminated from a light source in a certain direction are different between the scales 14 and 15 and the scales 14 and 15 overlapping the transparent high refractive index resin layers 33 and 34. .

In the figures, scales 14 and 15 represent the stencil pattern of the scaly powder-containing layer containing scaly pigment, and the background 1
Reference numerals 3 and 32 denote background patterns, characters 16 and 17 and image 12
Means an information carrying layer. <Substrate> As the substrate, papers such as paper, polypropylene, polystyrene, or synthetic paper obtained by laminating them with paper, plastics such as transparent or white polyethylene terephthalate base film, polyethylene terephthalate base film, and vinyl chloride base film Films, films of various metals and ceramics, etc. may be mentioned. IC memory, optical memory, magnetic memory, etc. may be incorporated in the substrate, and a single layer or a composite film of the above films may be used. The thickness of the substrate is about 100 to 1000 μm, preferably 300 to 800 μm. A writing layer may be provided on the back side. (Pattern pattern including scale pigment and background pattern not including scale pigment) Scale pigment is a scale-like flaky metal powder,
The surface of the core made of mica or flaky inorganic material is at least one selected from metals, alloys and metal oxides.
It is coated with a seed, and examples thereof include iris-colored pearl pigments and pearl chips.

The scale pigments preferably used in the present invention include metal oxides or metal sulfides which are transparent in the visible region and have a refractive index of 2.0 or more, as thin film coatings which give mica reflectivity (high iris reflection). Coated with, for example, Sb ₂ S ₃ , Fe ₂ O ₃ , PbO, ZnSe, CdS,
Bi ₂ O ₃ , TiO ₂ , PbCl ₂ , CeO ₂ , Ta ₂ O ₅ ,
ZnS, ZnO, CdO, Nd ₂ O ₃ , Sb ₂ O ₃ , SiO
And a single layer of InO ₃ or two layers.

When mica and a metal oxide film are combined, the difference in the refractive index is greater than 0.4, so that the amount of reflected white light is large, and at the same time, the secondary light is reflected at the interface between the mica and the metal oxide film. Because it causes refraction, it becomes highly iris reflective,
It works to promote the discoloration effect more effectively. At this time,
By controlling the thickness of the metal oxide film covering the mica, a scale pigment having high rainbow reflectivity of any color tone can be obtained.

The film thickness is 10 to 10,000 °, preferably 2
A film thickness in the range of 00 to 2000 ° is desirable because it has high iris reflectivity in the visible region. A commercially available example of such scale pigment is "Iriodin" (trade name, MERC)
K company). "Iriodin" is a stable inorganic flake pigment in which the surface of natural mica is coated with a metal oxide having a high refractive index such as titanium oxide and iron oxide. The light reflected at the boundary with the medium gives pearl luster. By changing the thickness of the coated titanium oxide, a specific iris color can be emphasized in the “Iriodin”. Further, an optical interference pigment in which an optical interference film is multi-layered is suitably used in the present invention.

Such a light interference pigment is specifically,
For example, it is commercially available from SHCPA under the trade name OVI. Such a scale pigment is used as an ink by adding a vehicle and additives to a mixture with a colorant.

As the additive, a heat-meltable compound or a thermoplastic compound is preferably used. Examples of the heat-fusible compound include vegetable waxes such as carnauba wax, candelilla wax, wood wax, ouriculi wax, rice wax, jojoba oil, and Espal wax; animal waxes such as beeswax, insect wax, shellac wax and spermaceti, lanolin; Petroleum waxes such as paraffin wax, microcrystalline wax, petrolatum, ester wax and oxidized wax; and mineral waxes such as montan wax, ozokerite and ceresin; Fischer-Tropsch wax, polyethylene wax, montan wax derivatives, paraffin wax derivatives, microcrystalline wax So-called waxes such as derivatives, hardened castor oil, synthetic waxes such as hardened castor oil derivatives, and the like. In addition to these waxes, palmitic acid, stearic acid, margaric acid, behenic acid, etc. Higher fatty acids; higher alcohols such as palmityl alcohol, stearyl alcohol, behenyl alcohol, marganyl alcohol, myricyl alcohol and eicosanol; higher fatty acid esters such as cetyl palmitate, myristyl palmitate, cetyl stearate and myricyl stearate; acetamido, propion Examples include amides such as acid amide, palmitic amide, stearic amide, behenic amide and amide wax; and higher amines such as stearylamine, behenylamine and palmitylamine.

Examples of the thermoplastic compound include polyacetoacetal, butyral resin, polyurethane resin, cellulose resin, polystyrene resin, polyethylene resin, polypropylene resin, polyester resin, polyamide resin, acrylic resin, and polycarbonate resin. Can be

The scale-containing layer pattern in the form of the first image recording medium of the present invention is formed of a scale-containing layer pattern having at least two kinds of angles at which the color changes depending on the reflection angle. At least two types of scale-containing layer patterns may have the same color that changes depending on the reflection angle.

In the scaly powder-containing layer according to the second embodiment of the present invention, the angle at which the color changes depending on the reflection angle is 10 ° or more and 45 ° or less with respect to the regular reflection angle. The angle at which the color changes can be changed, for example, by controlling the angle and frequency at which the color is changed with respect to the scale pigment type or the scale pigment base material.

The angle of the specular reflection light is 10 ° or more and 45 ° or more.
L ^* a ^* b ^*
When represented by the color system (JIS Z8729), the a ^* value b ^* value is reversed in the reflection angle range.

The color of the reflected light at the regular reflection angle is represented by L ^* a ^*.
When expressed in b ^* color system (JIS Z8729), a ^* >
b ^* a scaly powder-containing layer region is, there is a scale-like powder-containing layer region is a ^* <b ^*.

The L ^* a ^* b ^* color system is the most popular color system used in every field to represent the color of an object, and is planned by the International Commission on Illumination (CIE).
It is adopted in JIS (JIS Z8729).
In the L ^* a ^* b ^* color system, lightness is represented by L ^* , and chromaticity indicating hue and saturation is represented by a ^* b ^* . FIG. 6 shows a chromaticity diagram of the L ^* a ^* b ^* color system. In FIG. 6, a ^* and b ^* indicate the direction of the color, and a ^*
Is red, -a ^* is green, and b ^* is yellow, -b ^*
Indicates the blue direction. As the numerical value increases, the color becomes more vivid, and at the center, the color becomes duller.

In this case, it is preferable that the scale pigments contained in the respective layers of the color print pattern have different particle size distributions or different densities of the scale pigments. In addition, it is preferable that the scale pigment is arranged in parallel with the base material. Further, in the plurality of scale-containing layer patterns, it is preferable that the angle and the frequency at which each of the scale-type pigment patterns is uniformly arranged with respect to the base material of the scale pigment are different. The angle set with respect to the substrate is preferably 0 ° to 50 °, more preferably 5 ° to 30 °. If they are installed randomly, the color change due to the angle will be small and the color developability will be degraded. in this case,
Even with the same pigment, the angle at which the color changes can be changed. As the scale pigments, those having a particle size of 5 to 100 μm are generally used. However, if only pigments having a relatively small particle size with a particle size distribution of about 5 to 25 μm are used, the color of the scale pigment changes depending on the viewing angle. Effect can not be obtained sufficiently, and if only a pigment having a relatively large particle size with a particle size distribution of about 50 to 100 μm is used, the transfer of the flake pigment onto the base material is insufficient when a color pattern is formed. And the color developability deteriorates.

The color pattern including the scale pigment is formed by printing as an ink as described above, or by transferring a coating film formed by mixing a scale pigment with a well-known binder resin. . Representative examples of the binder resin include, for example, acrylic resins such as polymethyl methacrylate, styrene resins such as polystyrene, vinyl chloride resins such as polyvinyl chloride, vinylidene chloride resins such as polyvinylidene chloride, and polyethylene terephthalate. Polyester resin, cellulose resin such as cellulose acetate, polyvinyl acetal resin such as polyvinyl butyral, epoxy resin, amide resin, urethane resin, melamine resin, alkyd resin, phenol resin, fluorine resin, silicone Base resin, polycarbonate, polyvinyl alcohol, casein, gelatin and the like.

The background pattern may be printed using an OP ink, a thermoplastic resin composed of a block polymer of polystyrene and polyolefin, a hydrogenated styrene-based thermoplastic resin, a styrene-based thermoplastic resin, a functionalized reactive styrene-based resin. It is formed by transferring a coating film composed of a thermoplastic resin, an olefin-based thermoplastic resin, a thermoplastic fluororubber, a polyester-based thermoplastic resin, a polyurethane-based thermoplastic resin, polyvinyl butyral, a styrene-maleic anhydride copolymer resin, or the like. .

The background pattern may be transparent or colored. Further, the background pattern may contain a fluorescent pigment and / or a white pigment. As white pigments, for example, titanium oxide, calcium carbonate, zinc oxide,
Examples include aluminum oxide and talc.

The color pattern including the scale pigment and the background pattern not including the scale pigment are attached to the same screen on the surface of the base material of the image recording body by hair removal, that is,
The color pattern and the background pattern are formed so as to be adjacent to each other. It is preferable that the color pattern and the background pattern have the same thickness, and the preferable thickness is 2 to 5 μm. 2
When the thickness is smaller than μm, the effect of changing the color depending on the viewing angle of the scale pigment cannot be sufficiently obtained, and when the thickness is larger than 5 μm, the image recording property deteriorates.

The color pattern according to the present invention includes a scale pattern containing a scale pigment that changes from a specific color 1 to a specific color 2 depending on the viewing angle, and a color 3 from a specific color 3 depending on the viewing angle. It may be composed of three types of color pattern including a color pigment pattern including a scale pigment and a color pattern including a scale pigment that changes from a specific color 5 to a specific color 6 depending on a viewing angle. Only the color pattern changing from the specific color 1 to 2 may be composed of at least two types of color pattern having different angles at which the color changes.

The image recording medium of the present invention may have, in addition to the color pattern containing the scale pigment, a color pattern that emits a specific color when irradiated with ultraviolet rays or infrared rays. Such a pattern can be formed by using an ultraviolet absorbing pigment or an infrared absorbing pigment. <Image recording method> Image recording is performed by forming an information carrying layer by providing at least one selected from an authentication identification image such as a face image, an attribute information image, and format printing, and then forming an image or a printing surface on the information carrying layer. This is performed by forming a protective layer on the side using a coating or a thermal transfer sheet as needed.

When a transfer foil is used as the transparent protective layer, the transfer of the transfer foil to the material to be transferred is usually performed by means such as a thermal head, a heat roller, a hot stamp machine or the like which can apply pressure while heating.

As a method of forming an authentication identification image typified by a face image, a silver halide photographic method and a sublimation type thermal transfer recording method, which are advantageous for forming a gradation image, can be mentioned. In recent years, a driving license has been typified. So the latter is becoming more common.

The attribute information is a name, an address, a date of birth, a qualification, and the like. The attribute information is usually recorded as character information, and a fusion type thermal transfer recording method is generally used. The format printing is performed on the base material or the image receiving layer used in the sublimation type thermal recording system by a printing method such as resin letterpress printing, lithographic printing, and silk printing.

The image recording medium of the present invention may be further provided with a picture layer. Printed material, hologram,
Barcode, matte pattern, fine pattern, tint block, uneven pattern, etc. are appropriately selected, visible light absorbing color material, ultraviolet light absorbing material,
It is composed of an infrared absorbing material, a fluorescent whitening material, a metal deposited layer, a glass deposited layer, and the like. Holograms include relief holograms, Fresnel holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser holograms such as image holograms, Lippmann holograms,
A white reproduction hologram such as a rainbow hologram, a color hologram, a computer hologram, a hologram display, a multiflex hologram, a hologram flex stereogram, a holographic diffraction grating, or the like can be arbitrarily adopted.

FIGS. 7 and 8 show an embodiment of the authenticity judgment method of the present invention.

FIG. 8 shows the light source 50a and the light-receiving part 50b of the spectral colorimeter 50 for measuring the color. The color measuring and inputting device is particularly provided that the values described in the present invention can be obtained. There are no restrictions. For example, there are a colorimeter for tristimulus values, a spectral radiance meter, and an optical microscope.

The optical microscope is not particularly limited. For example, there is a method in which an image captured by a computer with a video scope is subjected to color image processing by image processing software to measure a color area per unit area. As the light source, a halogen bulb or the like can be selected. Light sources of ultraviolet wavelength light and infrared light can also be used.

The method for determining the authenticity of an image recording medium according to the present invention is as follows.
The scales 14 and 15 and the portion 1a other than the scales 14 and 15 are irradiated from the light source 50a in a certain direction, and reflected light in two directions including at least a regular reflection angle is observed by the light receiving unit 50b. Spectral reflectance and scale 1
The spectral reflectances of the portions 1a other than 4 and 15 are compared, and the authenticity is determined based on the difference in the reflectance at a predetermined wavelength.

The computer 51 binarizes the spectral reflectance waveform obtained by observing the reflected light in at least two directions including the specular reflection angle, and converts the spectral reflectance waveform of the portion 1 a other than the scales 14 and 15 into a binary value. And comparing the two, and the authenticity is determined based on the difference in reflectance at a predetermined wavelength.

When the color of the specular reflection light and the color of the reflection angle other than the specular reflection light are represented by the L ^* a ^* b ^* color system, a ^: value b ^*
True / false judgment can be made based on the reflection angle at which the value is reversed and a predetermined a ^* b ^* value.

Further, the computer 51 binarizes the spectral reflectance waveform obtained by observing the reflected light in at least two directions including the angle at which the specular reflection angle and the color are different from each other based on a predetermined reference, and obtains the spectral reflectance of the reflected light at the reflection angle. The authenticity is determined by correlating the waveform and the reflection angle with different colors.

FIG. 9 shows another example of the authenticity determination method according to another embodiment of the present invention.

This embodiment is a case where the image recording medium 1 shown in FIG. 4 has at least one fluorescent coloring layer and one infrared coloring layer, and the light source is an ultraviolet region and a red region in addition to the visible light region. The light is radiated by the light source 50c in the outer region, received by the light receiving unit 50d, and the computer 51 determines whether the color of the reflected light in the visible light, the ultraviolet light region, or the infrared light region or the spectral reflectance or the reflection angle is different. Make a decision.

FIG. 10 shows another example of the authenticity determination method according to another embodiment of the present invention.

In this embodiment, the scales 14, 1
5 is photographed by an optical microscope 52, and the photographed scaly powder image is image-processed by a computer 51 based on a predetermined color criterion, and authenticity judgment is performed based on the color criterion and the existence ratio per unit area of the image-processed scaly powder. Do.

The scales 14 and 15 are fixed to the light source 5 in a certain direction.
Irradiated from 2a, photographed with an optical microscope 52 at at least two reflection angles, a computer 51 performs image processing on the scaly powder image at each reflection angle with a predetermined color reference, and judges whether the color reference and the reflection angle are true or false. It can be performed. Further, the computer 51 performs image processing on the flaky powder image at each reflection angle based on a predetermined color standard,
True / false judgment is made based on the color reference and the existence ratio per unit area of the image-processed flaky powder.

The scale-like powder image can be binarized based on a predetermined color standard, and the authenticity can be determined based on the color standard and the existence ratio per unit area.

Further, the scales 14 and 15 are irradiated from a light source in a certain direction, and image processing for binarizing the scale-like powder image taken by the optical microscope 52 based on at least two or more colors is performed.

The method for determining the authenticity of an image recording medium according to the present invention is as follows.
The image recording body 1 is the image recording body according to claims 1 to 8, but is not limited thereto, and includes at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer. The present invention can be applied to the determination of the authenticity of an image recording medium.

Further, transparent high refractive index resin layers 33 and 34 are provided so as to overlap the scales 14 and 15 and at least a part of the scales 14 and 15 described in the image recording medium 1 shown in FIG. In the image recording medium, the authenticity is determined from the angle of the reflected light emitted from the light source in a certain direction in each area and the color of each area at the angle of the reflected light. [Examples] Hereinafter, the present invention will be described in detail with reference to examples, but embodiments of the present invention are not limited thereto. In addition,
Hereinafter, “parts” indicates “parts by weight”. Example 1 (Preparation of base material) White polypropylene resin [manufactured by Mitsubishi Yuka: Noblen FL2] on both sides of a polyethylene terephthalate (manufactured by Teijin Limited: Tetron HS350) having a thickness of 350 μm.
5HA] by extrusion lamination to a thickness of 50
μm. One surface of the obtained composite resin sheet was subjected to a corona discharge treatment at 25 W / m ² · min, and this sheet was used as a base material. (Preparation of Image Receiving Layer as Information Carrying Layer for Sublimation-Type Thermal Transfer Recording) A coating liquid for forming a first image receiving layer and a coating for forming a second image receiving layer having the following composition on the surface of the substrate subjected to the corona discharge treatment. The solution and the coating solution for forming the third image receiving layer were applied and dried in this order, and laminated so that the thicknesses thereof became 0.2 μm, 2.5 μm, and 0.5 μm, respectively, to form an image receiving layer. <Coating liquid for forming the first image receiving layer> 9 parts of polyvinyl butyral resin [manufactured by Sekisui Chemical Co., Ltd .: SREC BL-1] 9 parts isocyanate [manufactured by Nippon Polyurethane Industry Co., Ltd .: coronate HX] 1 part methyl ethyl ketone 80 parts butyl acetate 10 parts 2 Coating Solution for Forming Image Receiving Layer> Polyvinyl Butyral Resin [Sekisui Chemical Co., Ltd .: S-REC BX-1] 6 parts Metal ion-containing compound (Compound MS) 4 parts Methyl ethyl ketone 80 parts Butyl acetate 10 parts <3rd image receiving layer forming Coating liquid> Polyethylene wax [Toho Chemical Industry Co., Ltd .: Hitec E1000] 2 parts Urethane-modified ethylene acrylic acid copolymer [Toho Chemical Industry Co., Ltd .: Hitec S 6254] 8 parts Methylcellulose [Shin-Etsu Chemical Co., Ltd .: SM15] 0 .1 part water 90 parts (including color pattern with scale pigment and scale pigment (Formation of Background Pattern, Micro-Character) On the image receiving layer of the base material, solid printing was performed using a scale pigment ink 1 and an OP ink having the following compositions using a multicolor offset printing machine. That is, the color pattern including the scale pigment is solid-printed with the scale pigment ink 1 (area 1), and 30% halftone dot printing is performed at a different position with the scale pigment ink 2 (area 2). Printed with OP ink as micro-characters. The border between the color pattern and the background pattern was so-called hair removal. Either the color print pattern, the background pattern, or the printing order of the micro characters may be first. As a printing method, a method such as gravure, letterpress, or silk screen may be used in addition to offset printing. <Scale pigment ink 1> Iriodin 231 (particle size distribution: 5 to 25 μm: manufactured by MERCK) 35 parts Nipporan N5230 (thermoplastic compound: manufactured by Nippon Polyurethane) 10 parts Urethane acrylate oligomer 30 parts Aliphatic polyester acrylate oligomer 10 parts Dilocure 1173 (Ciba Specialty Chemicals) 5 parts Trimethylolpropane acrylate 10 parts <Scale pigment ink 2> Iriodin 223 (particle size distribution 5 to 25 μm: MERCK) 35 parts Nipporan N5230 (Thermoplastic compound: Nippon Polyurethane) 10 parts Urethane acrylate oligomer 30 parts Aliphatic polyester acrylate oligomer 10 parts Dylocure 1173 (manufactured by Ciba Specialty Chemicals) 5 parts Trimethi Roll Propane Acrylate 10 parts (Preparation of ink sheet for sublimation type thermal transfer recording) Coating liquid for forming yellow ink layer and magenta ink layer of the following composition on 6 μm thick polyethylene terephthalate sheet processed to prevent fusing on the back surface The coating liquid and the coating liquid for forming a cyan ink layer were provided so that the thickness of each was 1 μm, and three color ink sheets of yellow, magenta, and cyan were obtained. <Coating liquid for forming yellow ink layer> Yellow dye (Compound Y-1) 3 parts Polyvinyl acetal (manufactured by Denki Kagaku Kogyo Co., Ltd .: Denka Butyral KY-24) 5.5 parts Polymethyl methacrylate-modified polystyrene [Toa Gosei Chemical Industry Co., Ltd. Co., Ltd .: Rededa GP-200] 1 part Urethane-modified silicone oil [Dainichika Chemical Co., Ltd .: Dialomer SP-2105] 0.5 parts Methyl ethyl ketone 70 parts Toluene 20 parts <Coating liquid for forming a magenta ink layer> Magenta Dye (Compound M-1) 2 parts Polyvinyl acetal (Denka Butyral KY-24, manufactured by Denki Kagaku Kogyo Co., Ltd.) 5.5 parts Polymethyl methacrylate modified polystyrene [Toa Gosei Chemical Industry Co., Ltd .: Rededa GP-200] 2 parts Urethane-modified silicone oil [Dalinomer SP-2110 manufactured by Dainichi Seika Kogyo Co., Ltd.] 0.5 parts methyl ethyl ketone 70 parts toluene 20 parts <Cyan ink layer forming coating liquid> cyan dye (compound C-1) 1.5 parts cyan dye (compound C-2) 1.5 parts polyvinyl acetal [electrochemical 5.6 parts of polymethyl methacrylate-modified polystyrene [manufactured by Toa Gosei Chemical Co., Ltd .: Reda GP-200] 1 part Urethane-modified silicone oil [manufactured by Dainichiseika: Dialomer SP -21 05] 0.5 parts Methyl ethyl ketone 70 parts Toluene 20 parts (Preparation of ink sheet for melt-type thermal transfer recording) A 6 μm thick polyethylene terephthalate sheet coated on the back side with an anti-fusion coating to form an ink layer having the following composition The working solution was applied to a thickness of 2 μm and dried to obtain an ink sheet. <Coating liquid for forming ink layer> Carnauba wax 1 part Ethylene vinyl acetate copolymer [manufactured by DuPont Chemical: EV40Y] 1 part Carbon black 3 parts Phenolic resin [Arakawa Chemical Industries: Tamanol 521] 5 parts Methyl ethyl ketone 90 Part (Formation of face image) The image receiving layer on which the color pattern containing the scale pigment and the background pattern not containing the scale pigment are overlapped with the ink layer side of the ink sheet for sublimation type thermal transfer recording, and from the ink sheet side By heating using a thermal head under the conditions of an output of 0.23 W / dot, a pulse width of 0.3 to 4.5 msec, and a dot density of 16 dots / mm, a human image with gradation is formed on the image receiving layer. did. In this image, the dye and nickel in the image receiving layer form a complex. (Formation of character information) The color print pattern containing the scale pigment and the background pattern printing portion not containing the scale pigment on the base material are superimposed on the ink layer side of the ink sheet for melt-type thermal transfer recording, and from the ink sheet side. Output 0.5 W / dot, pulse width 1.0 ms, dot density 1 using thermal head
By heating under the condition of 6 dots / mm, character information was formed so as to cover the boundary between the color pattern and the background pattern. (Formation of Protective Layer) -Preparation of Transfer Foil- One side of polyethylene terephthalate (S-25) manufactured by Diafoil Hoechst Co., Ltd.
The intermediate layer and the adhesive layer were sequentially laminated to obtain a transfer foil having the structure of support / release layer / transparent resin layer / intermediate layer / adhesive layer. << Coating solution for each layer for transfer foil >><Coating solution for forming release layer> Film thickness: 1.0 μm Acrylic resin [Mitsubishi Rayon Co., Ltd.] 5 parts Polyvinyl acetal [Sekisui Chemical Co., Ltd.] 5 parts Methyl ethyl ketone 40 parts Toluene 50 Part <Transparent resin layer: UV curable layer coating liquid> Cured resin elongation at break 30% Trifunctional monomer [manufactured by Shin-Nakamura Chemical Co.] 35 parts Epoxy-modified bifunctional oligomer [manufactured by Shin-Nakamura Chemical Co.] 30 parts Contains unsaturated group Acrylic resin 30 parts Photopolymerization initiator (manufactured by Ciba Geigy) 5 parts Methyl ethyl ketone 50 parts Toluene 100 parts Curing after application was performed by a high-pressure mercury lamp of 160 W / cm ^{2 at} an irradiation distance of 18 cm and light scanning of CS 5 m. The Dry film thickness was 7.0 μm. <Intermediate layer forming coating liquid> Thickness: 1.0 μm Polyvinyl butyral resin [manufactured by Sekisui Chemical: Eslec BX-1] 3.5 parts Tuftex M-1913 [manufactured by Asahi Kasei Corporation] 5 parts Curing agent Polyisocyanate [Coronate] HX Nippon Polyurethane 1.5 parts Methyl ethyl ketone 90 parts Curing after addition of a curing agent was performed at 50 ° C. for 24 hours. <Coating liquid for forming adhesive layer> Film thickness: 0.5 μm Urethane-modified ethylene ethyl acrylate copolymer (manufactured by Toho Chemical Industry Co., Ltd.) 8 parts Polyacrylate copolymer (manufactured by Nippon Pure Chemical Co., Ltd.) 2 parts Water 45 parts Ethanol 45 parts (Formation of protective layer on card) The information carrying layer made up of the face image and character information and the adhesive layer surface of the transfer foil, which were formed earlier, are overlapped, and silicone rubber (rubber) is placed around a metal roller with an outer diameter of 3 cm. The surface temperature of the heat roller with a hardness of 80) is heated to 190 ° C., pressed from the transfer foil side, and transferred at a transfer speed of 23 mm / sec and a linear pressure of 10 kg / cm, and the transfer foil support is peeled off. Thus, an image recording medium 1 of the present invention shown in FIG. 11 was obtained.

In the obtained image recording medium 101, as shown in FIG. 12, the color of the color pattern including the scale pigment changes from silver to green and from green to red depending on the viewing angle. It has an excellent anti-counterfeiting property by combining two different patterns. Example 2 On a base image receiving layer prepared in the same manner as in Example 1, a multi-color offset printing machine was used to solid-print a stencil pattern containing a scale pigment with scale pigment ink 1, and a non-printed portion was formed. It was printed with OP ink as a background pattern. Further, a scale area 2 in which a color pattern is overprinted with the scale pigment ink 1 is printed on a part of the upper scale area 1 and a part of the non-printed part formed by the scale pigment ink 1, and the non-printed part is set as a background. The pattern was overprinted with OP ink. The border between the color pattern and the background pattern was so-called hair removal.

Next, after forming an information carrying layer composed of a face image and character information in the same manner as in Example 1, a protective layer was formed in the same manner as in Example 1, and an image recording medium of the present invention shown in FIG. 102 was obtained. The scaly containing layer was irradiated from a light source at 45 ° to the normal with the apparatus shown in FIG. 14 and the angle at which the color changed was measured. The scaly area 1 and the scaly area 2 were respectively 35 ° and 15 ° with respect to the specular reflection angle. The color has changed.

An excellent anti-counterfeiting property was obtained, in which a pattern in which the color of a chromatic pattern containing scaly pigments changed from silver to green depending on the viewing angle had two patterns with different shadings and different discoloration angles. Example 3 On the image receiving layer of the support prepared in the same manner as in Example 1,
Using a multicolor offset printing machine, a color pattern including a fluorescent coloring pigment was solid-printed with the fluorescent pigment ink 1, and a non-printed portion was printed with an OP ink as a background pattern. further,
A scale area 2 in which the color pattern was overprinted was printed on a part of the upper area 1 of the color pattern formed with the fluorescent pigment ink 1, and the non-printed part was overprinted with OP ink as a background pattern. The border between the color pattern and the background pattern was so-called hair removal.

Then, after forming an information carrying layer composed of a face image and character information in the same manner as in the first embodiment, a protective layer was formed in the same manner as in the first embodiment. 103 was obtained. The scale-containing layer was irradiated with a device shown in FIG. 14 from a light source at 45 ° to the normal, and the angle at which the color changed was measured. As a result, the color of the scale region 2 changed at 15 ° to the specular reflection angle. Further, when the light source is a UV lamp, the color of the color pattern including the scale pigment changes from silver to green, and the same scale area 2 emits blue light, and the scale area 1 whose color does not change depending on the angle emits blue light. It has excellent anti-counterfeiting and anti-counterfeiting properties by combining two different patterns. Comparative Example 1 A multi-color offset printing machine was used to solid-print a stencil pattern containing a flake pigment with a flake pigment ink 3 having a lower composition on the image receiving layer of the substrate prepared in the same manner as in Example 1. The printed portion was printed with OP ink as a background pattern. Further, a color pattern was overprinted with the scale pigment ink 3 on the color pattern formed with the scale pigment ink 3, and the non-printed portion was overprinted with OP ink as a background pattern. The border between the color pattern and the background pattern was so-called hair removal.

Next, after forming an information carrying layer composed of a face image and character information in the same manner as in the first embodiment, a protective layer is formed in the same manner as in the first embodiment.
I got As shown in FIG. 14, the scale-containing layer was
When the light was irradiated from a 5 ° light source and the angle at which the color changed was measured, the scale area 1 and the scale area 2 were each 4
The color gradually changed from 5 ° to 55 °.

The color change was gradual and did not change unless it was close to the light source. <Scale pigment ink 3> Iriodin 231 (particle size distribution: 5 to 25 μm: manufactured by MERCK) 15 parts Nipporan N5230 (thermoplastic compound: manufactured by Nippon Polyurethane) 10 parts Urethane acrylate oligomer 30 parts Aliphatic polyester acrylate oligomer 10 parts Dilocure 1173 (Ciba Specialty Chemicals) 5 parts Trimethylolpropane acrylate 10 parts Dispersion was sufficiently performed with three rolls. Example 4 On a substrate image receiving layer prepared in the same manner as in Example 1, a multi-color offset printing machine was used to print a 50% halftone dot pattern containing scale pigment with scale pigment ink 2 to obtain a non-printing pattern. The printed portion was printed with OP ink as a background pattern. further,
On the upper scale region 1 of the color print pattern formed by the scale pigment ink 1, a color print pattern was further overprinted with 50% halftone dots with the scale pigment ink 2, and the non-printed portion was overprinted with OP ink as a background pattern. The border between the color pattern and the background pattern was so-called hair removal.

Next, after forming an information carrying layer composed of a face image and character information in the same manner as in the first embodiment, a protective layer was formed in the same manner as in the first embodiment.
I got Using this image recording medium 104, the scale-containing layer was irradiated from a light source at 45 ° to the normal with the apparatus shown in FIG. The color was measured with a GC2000 (manufactured by Nippon Denshoku Industries Co., Ltd.) and expressed in L ^* a ^* b ^* color system, as shown in Table 1.

[0107]

[Table 1] Scale region 1 a ^* b ^* value at the a ^* b ^* values at 20 ° to 25 ° with respect to the regular reflection angle is reversed is in the range of -1 to 1.

The color pattern of the chromatic pattern including the scale pigment changed from green to red depending on the viewing angle. The color change angle and a ^* b ^* value were measured, and it was determined that the product was a predetermined genuine product. In addition, it has excellent anti-counterfeiting properties. Example 5 Using the image recording medium 104 produced in the same manner as in Example 2, the scale-containing layer was set at 45 ° with respect to the normal using the apparatus shown in FIG.
And the specular colorimeter (GC2000; manufactured by Nippon Denshoku Industries Co., Ltd.) was used to measure the color at a normal line of 0 ° and a specular colorimetric angle of 45 ° with respect to the normal line of 0 °. A spectral reflectance waveform of 400 nm to 700 nm was obtained.

[0109] The spectral reflectance waveform is represented by 1 centered on the average reflectance.
19 and FIG.
A processing waveform of 0 was obtained. The scale-containing layer was irradiated from a light source at 45 ° with respect to the normal line as shown in FIG. 14 and the angle at which the color changed was measured. The scale region 1 and the scale region 2 were colored at 35 ° and 15 ° with respect to the specular reflection angle, respectively. Has changed.

An intrinsic product having a pattern in which the color of the color pattern including the scale pigment changes from silver to green depending on the viewing angle, the spectral reflectance waveform is measured and the binarized spectral reflectance waveform and the discoloration angle are predetermined Could be determined. Also,
It has excellent anti-counterfeiting properties. Example 6 An image recording member 105 was prepared in the same manner as in Example 4 except that the scale pigment ink was changed to Ink 2. Using the produced image recording medium 105, the scale-containing layer was subjected to an optical microscope (VH-70).
00; manufactured by Keyence Corporation) with a white light source.
The image was photographed at a magnification of 000, and the area of the green component was calculated using image processing software on a computer. FIG. 21 shows a conceptual diagram thereof. The area of the red component was 5%.

The color pattern of the chromatic pattern including the scale pigment changed from green to red depending on the viewing angle, and it was determined that each color component and its ratio per unit area were predetermined authentic products. In addition, it has excellent anti-counterfeiting properties. Example 7 Using the image recording medium 105 produced in the same manner as in Example 6, the scale-containing layer was irradiated with an optical microscope (VH-7000; manufactured by KEYENCE CORPORATION) using a halogen lamp light source at 45 ° to the normal line. The scale-containing layer was photographed by observing at a magnification of 1000 in each of two directions from the regular reflection angle and the normal line 0 °. Then, the area of the red component of the image obtained by observing and photographing the image from the specular reflection angle was calculated using image processing software on a computer, and it was 75% per unit area. FIG. 22 shows a conceptual diagram thereof. Green component is 2% per unit area
was. The area of the red component of the image observed and photographed from the normal 0 ° was calculated to be 15% per unit area and 65% per unit area for the green component. FIG. 23 shows a conceptual diagram thereof.

The color pattern of the color pattern including the scale pigment changes from green to red depending on the viewing angle, and it can be determined that each color component and its ratio per unit area are predetermined authentic products. In addition, it has excellent anti-counterfeiting properties. Example 8 A scale pattern 1 containing scale pigments was solid-printed with scale pigment ink 1 on a base image receiving layer prepared in the same manner as in Example 1 using a multicolor offset printing machine to produce scale areas 1. Then, the non-printed portion was printed with OP ink as a background pattern. Furthermore, the scale area 1 formed with the scale pigment ink 1
Further, only 50% of the scale region 1 was overprinted by gravure printing with a high-refractive-index resin ink (CYB-MATEX Co., Ltd., containing GS600-4, refractive index 1.87). The border between the color pattern and the background pattern was so-called hair removal. (FIG. 3) Next, after forming an information carrying layer composed of a face image and character information in the same manner as in the first embodiment, a protective layer is formed in the same manner as in the first embodiment to obtain an image recording body 104 of the present invention. Was.

The obtained image recording medium 106 has an angle at which 50% of the color of one color pattern including scale pigment changes from silver to green depending on the viewing angle, and a color change pattern with the remaining 50% area of the color pattern. Has an excellent anti-counterfeiting property of combining two different patterns.

[0114]

As described above, according to the first aspect of the present invention, at least two types of flaky powder-containing layers differ in color depending on the reflection angle, and can more reliably prevent forgery and falsification.

According to the second aspect of the present invention, the color changes in the reflection angle range due to the flaky powder-containing layer, and also differs from the color of the region other than the flaky powder-containing layer, thereby more reliably preventing forgery and falsification. be able to.

According to the third aspect of the present invention, the a ^* value b ^* value is reversed in the reflection angle range, and the color is different depending on the reflection angle.
Forgery and falsification can be prevented more reliably.

According to the fourth aspect of the present invention, there is a flaky powder-containing layer region where a ^* > b ^* and a flaky powder-containing layer region where a ^* <b ^* . Forgery and falsification can be prevented more reliably.

According to the fifth aspect of the present invention, forgery and falsification can be more reliably prevented by providing micro-characters.

According to the sixth aspect of the present invention, when the fluorescent coloring layer or the infrared coloring layer at least overlaps with the flaky powder-containing layer, the color changes between the overlapping portion and the non-overlapping portion, thereby providing more reliable. Forgery and forgery can be prevented.

In the invention according to claim 7, the protective layer is protected by the transparent protective layer provided on the outermost layer.

According to the invention described in claim 8, the card can be used as an individual authentication card such as a cash card, an employee card, an employee card, a member card, a student card, an alien registration card and various licenses.

According to the ninth aspect, the authenticity can be reliably determined based on the difference in reflectance at a predetermined wavelength.

According to the tenth aspect of the present invention, the spectral reflectance waveform is binarized and compared, so that the authenticity can be reliably determined based on the reflectance difference at a predetermined wavelength.

According to the eleventh aspect, the authenticity can be reliably determined based on the reflection angle at which the a ^* value b ^* value is reversed and the predetermined a ^* b ^* value.

In the twelfth aspect of the present invention, binarization is performed,
Correlation between the spectral reflectance waveform of the reflected light at the reflection angle and the reflection angles having different colors enables reliable determination of the authenticity.

According to the thirteenth aspect of the present invention, it is possible to surely determine the authenticity at the reflection angles where the colors, spectral reflectances, or colors of the reflected light in the visible light, ultraviolet light, and infrared light regions are different. it can.

According to the fourteenth aspect of the present invention, the authenticity can be reliably determined based on the color standard and the existence ratio of the image-processed flaky powder per unit area.

According to the fifteenth aspect, it is possible to perform image processing on the scale-like powder image at the reflection angle based on a predetermined color criterion, and to surely determine the authenticity based on the color reference and the reflection angle.

According to the sixteenth aspect of the present invention, the authenticity can be reliably determined based on the color standard and the existence ratio per unit area of the image-processed flaky powder.

According to the seventeenth aspect of the invention, the authenticity can be reliably determined based on the color reference and the existence ratio per unit area.

According to the eighteenth aspect, by performing image processing for binarizing a scale-like powder image based on at least two or more colors, the authenticity can be reliably determined.

According to the nineteenth aspect, it is possible to reliably determine the authenticity of an image recording medium having a different color depending on the reflection angle.

According to the twentieth aspect of the present invention, the angle at which the reflection angle at which the color changes when illuminated from a light source in a certain direction overlaps the scale-like powder-containing layer and the transparent high refractive index resin layer. The forgery and forgery can be more reliably prevented by being different on the powder-form containing layer.

According to the twenty-first aspect of the present invention, the protective layer is protected by the transparent protective layer provided on the outermost layer.

In the invention according to claim 22, a transparent high-refractive-index resin layer is provided so as to overlap at least a part of the flaky powder-containing layer and at least a part of the flaky powder-containing layer described in the image recording medium. The authenticity of the image recording medium can be reliably determined.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an image recording body.

FIG. 2 is a diagram showing how the image recording medium looks when placed perpendicular to the line of sight.

FIG. 3 is a diagram showing how the image recording medium looks when placed at an angle of 50 ° with respect to the line of sight.

FIG. 4 is a sectional view of another embodiment of an image recording medium.

FIG. 5 is a cross-sectional view of another embodiment of the image recording body.

FIG. 6 is a diagram showing an L ^* a ^* b ^* color system chromaticity diagram.

FIG. 7 is a diagram showing an embodiment of a true / false judgment method.

FIG. 8 is a diagram showing an embodiment of a true / false judgment method.

FIG. 9 is a diagram showing an embodiment of a true / false judgment method.

FIG. 10 is a diagram showing an embodiment of a true / false judgment method.

FIG. 11 is a sectional view of an embodiment of an image recording body.

FIG. 12 is a diagram showing an embodiment of a true / false judgment method.

FIG. 13 is a sectional view of an embodiment of an image recording medium.

FIG. 14 is a diagram showing an embodiment of a true / false judgment method.

FIG. 15 is a sectional view of an embodiment of the image recording body.

FIG. 16 is a diagram showing an embodiment of a true / false judgment method.

FIG. 17 is a diagram showing a relationship between wavelength and reflectance.

FIG. 18 is a diagram showing a relationship between wavelength and reflectance.

FIG. 19 is a diagram showing a relationship between wavelength and binarized reflectance.

FIG. 20 is a diagram showing a relationship between wavelength and binarized reflectance.

FIG. 21 is a conceptual diagram illustrating a state in which an image is captured by an optical microscope and an area of a red component is calculated by image processing software on a computer.

FIG. 22 is a conceptual diagram showing a state in which the area of the red component of an image obtained by observing and photographing an image photographed by an optical microscope is calculated from specular reflection angles using image processing software on a computer.

FIG. 23 is a conceptual diagram showing a state in which an image is captured by an optical microscope and areas of red and green components of the image are calculated by image processing software on a computer.

[Explanation of symbols]

1,101,102,103,104,105,106
Image recording body 10 Base material 11 Information carrying layer 12 Identification information and image information 13 Background 14, 15 Scale 16, 17 Character 18 Transparent protective layer 20 Micro-character 30 Fluorescent coloring layer 31 Infrared coloring layer 32 Background 33, 34 Transparent high refraction Rate resin layer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G06K 7/10 G06K 7/10 Z 19/06 19/00 E 19/10 RF term (reference) 2C005 HA02 HB01 HB09 JA17 JB01 JB12 JB13 KA06 KA40 MA03 MB01 MB08 NA02 NA06 PA21 TA21 TA22 2H113 AA03 AA06 BC09 CA32 CA33 CA37 CA39 CA46 EA01 FA56 4J039 AB02 AB12 AD01 AD03 AD07 AD10 AE04 AE06 AE08 BA06 BA26 BC19 BC34 BC36 BE01 EA28 EA28 BB11 BB12 BC01 5B072 AA09 BB08 CC02 CC27 FF02 JJ08 KK01

Claims (22)

[Claims] 1. An image recording medium having at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer and having different colors depending on the reflection angle, wherein at least two types of scales having different reflection angles at which the color changes. An image recording body comprising a powder-like layer containing particles. 2. An image recording medium having at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer, wherein the flaky powder-containing layer is irradiated from a light source in a certain direction, and the angle of the specularly reflected light is changed. An image recording medium characterized in that the color changes in a reflection angle range different from 10 ° to 45 °, and also differs from the color of a region other than the flaky powder-containing layer. 3. An angle of 10 ° or more and 45 ° with respect to the angle of the specularly reflected light.
The a ^* value b ^* value is reversed in the reflection angle range when the color of the reflected light is represented by the L ^* a ^* b ^* color system in different reflection angle ranges. 3. The image recording medium according to 2. 4. The color of the reflected light at the specular reflection angle is L ^* a ^* b.
^* When represented by a color system, there is a flaky powder-containing layer region where a ^* > b ^* and a flaky powder-containing layer region where a ^* <b ^*. 3. The image recording medium according to 2. 5. The image recording body according to claim 1, wherein a micro character having a long side of 0.5 mm or less is provided. 6. The image recording medium according to claim 1, wherein a fluorescent coloring layer or an infrared coloring layer is provided so as to at least overlap with the flaky powder-containing layer. . 7. The image recording medium according to claim 1, wherein a transparent protective layer is provided on an outermost layer. 8. The identification information includes a face image, an address, a name,
8. The image recording medium according to claim 1, wherein personal information such as a date of birth is described. 9. A method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer, wherein the flaky powder-containing layer and the flaky powder-containing layer are not included. The part is irradiated from a light source in a certain direction, and the spectral reflectance of the reflected light in at least two directions including the specular reflection angle is compared with the spectral reflectance of the part other than the flaky powder-containing layer. A true / false judgment method characterized by performing a true / false judgment based on a difference in reflectance. 10. A binarizing process for a spectral reflectance waveform obtained by observing reflected light in two directions including at least a specular reflection angle, and a binarizing process for a spectral reflectance waveform of a portion other than the flaky powder-containing layer. 10. The method according to claim 9, wherein the comparison is performed, and the authenticity is determined based on a difference in reflectance at a predetermined wavelength.
Method for determining the authenticity described in 1. 11. A method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer, wherein the flaky powder-containing layer is irradiated from a light source in a certain direction. When the colors in at least two directions including the specular reflection angle are measured, and the color of the specular reflection light and the color of the reflection angle other than the specular reflection light are represented by L ^* a ^* b ^* color system, a ^* value b ^* The reflection angle at which the value is reversed,
A true / false judgment method characterized by performing a true / false judgment with a predetermined a ^* b ^* value. 12. A method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer and having different colors depending on the reflection angle. Irradiate from a light source in a certain direction, binarize the spectral reflectance waveform obtained by observing reflected light in two directions including at least a specular reflection angle and an angle different in color based on a predetermined reference,
A true / false judgment method characterized by performing a true / false judgment by correlating a spectral reflectance waveform of reflected light at a reflection angle with reflection angles having different colors. 13. The image recording medium has at least one fluorescent coloring layer and one infrared coloring layer, and the light source irradiates with a light source in an ultraviolet region and an infrared region in addition to a visible light region, and emits visible light and ultraviolet light. The true or false determination according to any one of claims 9 to 12, wherein the authenticity is determined at a reflection angle at which the color, the spectral reflectance, or the color of each of the reflected light in the region and the infrared light region is different. False judgment method. 14. A method for judging the authenticity of an image recording body having at least an information carrying layer on which identification information and image information are recorded, and a flaky powder-containing layer, wherein the flaky powder-containing layer is photographed with an optical microscope. A true / false judgment method comprising: performing image processing on a powder image based on a predetermined color standard; and performing authenticity judgment based on the color standard and the existence ratio per unit area of the image-processed flaky powder. 15. The flaky powder-containing layer is irradiated from a light source in a certain direction, photographed by an optical microscope at at least two reflection angles, and the flaky powder image at each reflection angle is image-processed on a predetermined color basis. 15. The authenticity determination method according to claim 14, wherein the authenticity is determined based on the color reference and the reflection angle. 16. The flaky powder-containing layer is irradiated from a light source in a certain direction, photographed with an optical microscope at at least two reflection angles, and image-processed on the flaky powder image at each reflection angle according to a predetermined color standard. 15. The authenticity determination method according to claim 14, wherein the authenticity is determined based on the color standard and the existence ratio per unit area of the image-processed flaky powder. 17. The method according to claim 14, wherein the scale-like powder image is binarized based on a predetermined color standard, and the authenticity is determined based on the color standard and the existence ratio per unit area.
7. The method for judging authenticity according to item 6. 18. An image processing for irradiating the scaly powder-containing layer from a light source in a certain direction and binarizing a scaly powder image taken by an optical microscope based on at least two or more colors. Any one of claims 14 to 16
Method for determining the authenticity described in the section. 19. The image recording medium according to claim 1, wherein the image recording medium is the image recording medium according to claim 1.
19. The method according to claim 18, wherein: 20. An image recording medium having at least an information carrying layer on which identification information and image information are recorded and a flaky powder-containing layer, wherein a transparent high refractive index resin is provided so as to overlap at least a part of the flaky powder-containing layer. Provide a layer, the angle at which the reflection angle at which the color changes by irradiating from a light source in a certain direction, on the flaky powder-containing layer, and on the flaky powder-containing layer overlapping the transparent high refractive index resin layer. An image recording medium characterized in that: 21. The image recording medium according to claim 20, further comprising a transparent protective layer. 22. The image recording medium having a transparent high refractive index resin layer provided so as to overlap at least a part of the flaky powder-containing layer and at least a part of the flaky powder-containing layer described in the image recording medium. A true / false determination method, wherein the true / false determination is performed based on the angle of reflected light emitted from a light source in a certain direction in each area and the color of each area at the reflected light angle.