JP7302281B2 - Information recording media, media and booklets - Google Patents

Description

The present invention relates to an information recording medium, medium and booklet.

2. Description of the Related Art Conventionally, there is a digital watermarking technique for embedding specific information in an image or the like. If this technology is used in printed matter, information can be embedded at a level that cannot be visually recognized by humans, and the artistic effect of the printed matter is not impaired. Also, the information embedded in the printed matter can be read by a reading device.

When this embedded information is used for authenticity determination, for example, it is desirable that the embedded information is difficult to be estimated from the copy. For this reason, a technology related to an information recording medium designed to make the embedded information less likely to be estimated has been disclosed (for example, Patent Document 1).

JP 2016-93895 A

According to Patent Document 1, an application capable of reading codes is installed in a mobile terminal such as a smart phone. However, when the mobile terminal is used in a security area such as a factory where the mobile terminal cannot be used, the authentication cannot be determined.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording medium, a medium, and a booklet that enable authenticity determination without using an application.

The present invention solves the above problems by means of the following solutions.
A first invention is an information recording medium having a composite image including a first image and a second image formed on the first image, wherein the first image is formed of a glittering material. wherein the second image is formed of a transparent material and includes at least a first divided image and a second divided image; and the first divided image is a pattern image generated according to a specific rule. , the amount of reflected light varies depending on an observation angle, the second divided image is formed by applying a fluorescent material to the transparent material, and the synthesized image is recognizable from the first divided image at a specific observation angle. wherein the second divided image can be recognized at a specific wavelength.
A second invention is the information recording medium according to the first invention, wherein the second divided image is a pattern image generated according to the rule, and is configured such that the amount of reflected light varies depending on the observation angle, and the synthesized image is and the information recording medium capable of recognizing the second image including the first divided image and the second divided image at the specific viewing angle. It is possible to obscure the pattern image of the first divided image.
A third invention is the information recording medium according to the first invention or the second invention, wherein the region of the first divided image is coded by performing conversion processing corresponding to the rule on the first divided image. is an information recording medium having a size capable of generating data corresponding to .
A fourth invention is the information recording medium according to any one of the first invention to the third invention, wherein the second divided image includes the fluorescent material that emits light in the UV-B region or the UV-C region. is given to the transparent material, and the composite image is an information recording medium in which the second divided image is recognizable in ultraviolet rays having wavelengths in the UV-B region and the UV-C region. It is possible to obtain an information recording medium that is difficult to forge (imitate) and difficult to crack.
A fifth invention is the information recording medium according to any one of the first invention to the fourth invention, wherein the first divided image includes the fluorescent material that emits light in the UV-B region or the UV-C region. is given to the transparent material, the first divided image and the second divided image emit light of different colors, and the combined image has wavelengths in the UV-B region and the UV-C region The information recording medium is such that the first divided image can be recognized in ultraviolet rays of .
A sixth invention is the information recording medium according to any one of the first invention to the fifth invention, wherein the first image comprises a background image and a pattern image, and the background image accounts for 50% or more of 70%. % or less, and the pattern image has a dot area ratio of 100%.
A seventh invention is a medium comprising the information recording medium according to any one of the first invention to the sixth invention.
An eighth invention is a booklet comprising the information recording medium according to any one of the first invention to the sixth invention.

According to the present invention, it is possible to provide an information recording medium, a medium, and a booklet that enable authenticity determination without using an application.

FIG. 3 is a diagram for explaining a printed matter according to the embodiment; FIG. It is a figure for demonstrating the ink used with the printed matter which concerns on this embodiment. FIG. 4 is a diagram showing an example of an image of a bright layer according to the embodiment; It is a figure which shows the example of the pattern image of the transparent layer which concerns on this embodiment. It is a figure which shows the printing example of the transparent layer which concerns on this embodiment. It is a figure for demonstrating the observation mode based on the structure of the information recording medium which concerns on this embodiment. FIG. 4 is a diagram for explaining the positional relationship between an illumination light source and a camera when copying a card according to the embodiment; 3 is a functional block diagram of the reader according to the embodiment; FIG. 6 is a flowchart showing code identification processing in the reading device according to the embodiment; It is a figure for demonstrating the relationship between the information recording medium which concerns on this embodiment, and a reading process.

EMBODIMENT OF THE INVENTION Hereafter, the form for implementing this invention is demonstrated, referring a figure. This is just an example, and the technical scope of the present invention is not limited to this.
(embodiment)
FIG. 1 is a diagram for explaining a printed matter 10 according to this embodiment.
FIG. 2 is a diagram for explaining the ink used in the printed matter 10 according to this embodiment.

<Printed matter 10>
A printed matter 10 (medium) shown in FIG. 1A is, for example, a ticket such as an admission ticket. FIG. 1A shows a plan view of the printed matter 10 viewed from above in the vertical direction Z. FIG. For example, the printed matter 10 itself has a monetary value, but a copy of the printed matter 10 does not have a monetary value. A printed matter 10 includes a base 11 and an information recording medium 30 .
The base 11 is a base material of the printed matter 10, and is made of white paper, for example. Note that the base 11 is not limited to white paper, as long as it has a flat surface capable of supporting a printed image, and may be other materials such as high-quality paper, coated paper, tack paper, plastic card, and film. The printed image applied to the printed product 10 relates to the content of the ticket in this example.

<Structure of information recording medium 30>
An information recording medium 30 is provided on the surface side of the base 11, that is, on the upper side in the Z direction. The information recording medium 30 is printed with information such as a code, which is used for authenticity determination, by latent image printing. The image printed on the information recording medium 30 is changed by changing the viewing direction of the base 11 .
FIG. 1(B) is a partial schematic diagram of a cross section along the GG direction in FIG. 1(A). FIG. 1B shows a cross-sectional view of the printed matter 10 viewed from the front in the Y direction. As shown in FIG. 1B, the information recording medium 30 includes a bright layer 31 and a transparent layer 32 on the base 11 .

The glitter layer 31 is a layer on which an image (first image) composed of a background image and a pattern image is printed with ink containing a glitter material. Here, the image formed by the bright layer 31 is not particularly limited, and may be a pattern or, for example, a code readable by the reader 5 described later.
The transparent layer 32 is a layer on which a pattern image (second image) different from the pattern image of the bright layer 31 is printed with ink of a transparent material. The pattern image of the transparent layer 32 is composed of two divided images. A code recognition image (first divided image), which is one of the divided images, is only transparent ink. On the other hand, the pattern image (the second divided image), which is the remaining image among the divided images, is formed by applying a fluorescent material to transparent ink. Here, in the following description, it is assumed that the pattern image formed by the transparent layer 32 is the same pattern image for the code recognition image and the pattern image. However, the pattern image may be a different pattern image, or may not be a pattern image.
In this example, both the bright layer 31 and the transparent layer 32 are square, and the transparent layer 32 is formed over the bright layer 31 .

Here, a method for manufacturing the information recording medium 30 will be briefly described.
First, a base 11 on which ticket contents have been printed is prepared, and a background image and a pattern image are gravure-printed as a glitter layer 31 on the base 11 with glossy ink or the like containing a glitter material. Various types of ink are assumed as the ink for drawing the background image and the pattern image, for example, as exemplified below.
For example, it may be silver ink containing aluminum powder, copper powder, zinc powder, tin powder, iron phosphide, or the like. Alternatively, the ink may be a silver ink mixed with a chromatic color ink containing a pigment or a dye.

Furthermore, the glitter layer 31 may be ink of only a glitter material exhibiting bluish gold or reddish gold. Moreover, the ink of the luster material showing bluish gold or reddish gold may be mixed with the chromatic ink of the above-mentioned colored pigment.
Furthermore, pearl ink, liquid crystal ink, OVI (Optical Variable Ink), CSI (Color Shifting Ink), etc., which are inks containing functional pigments that change color by reflecting light, may also be used. Incidentally, the pearl ink is an ink containing a pearl pigment that has a pearl luster compared to ordinary pigments, and has safety, luster, and high-class feeling. Liquid crystal inks are inks containing liquid crystals that have the property of changing color with temperature.
In the example shown in FIG. 2, the glitter layer 31 uses silver ink containing a glitter material.

Next, an image for code recognition and a design image are overlaid as a transparent layer 32 with transparent ink or the like on the image of the bright layer 31 and gravure-printed. The ink for drawing the code recognition image is, for example, achromatic ink such as matte OP varnish, transparent varnish, ink varnish, transparent ink or medium ink. These inks may be any printing inks such as ultraviolet curable inks, oxidative polymerization inks, penetrating inks, heat drying inks, and evaporation drying inks. The ink for drawing the pattern image is an ink obtained by mixing the achromatic ink described above with a fluorescent material, for example, an ink that emits light in the UV-B region or the UV-C region. The UV-B region has an ultraviolet excitation wavelength of about 313 nm (280-315 nm), while the UV-C region has an ultraviolet excitation wavelength of about 254 nm (200-280 nm). Inks that emit light in the UV-B region or the UV-C region are special inks that are not commercially available.

In the following description, an ink obtained by mixing achromatic ink with a fluorescent material, such as ink that emits light when irradiated with light in the UV-B region or the UV-C region, is also referred to as "special fluorescent ink". . These special fluorescent inks develop a fluorescent color when irradiated with ultraviolet rays having wavelengths in the UV-B region or the UV-C region, and are colorless and transparent under normal circumstances.

FIG. 2 exemplifies a case where the ink used for the transparent layer 32a forming the code recognition image is an achromatic ink, and the ink used for the transparent layer 32b forming the pattern image is a special fluorescent ink. FIG. 2(a) shows a cross-sectional view, and (a-1) and (a-2) are both when the plan views (b) and (c) are cut along the line II. is a diagram. As shown in FIG. 2(b-1), the ink used for the transparent layer 32a constituting the code recognition image and the ink used for the transparent layer 32b constituting the pattern image are used in any case. It is also colorless and transparent under normal light irradiation. As shown in FIG. 2(b-2), the transparent layer 32a is colorless and transparent when irradiated with ultraviolet light having a specific wavelength, which is light in the UV-B region or the UV-C region, but the transparent layer 32b is , for example, fluorescent blue light. Here, in addition to blue, at least green and red should be prepared as colors that emit light under an environment where light in the UV-B region or the UV-C region is irradiated by the special fluorescent ink. Then, by combining these three colors of special fluorescent inks, various colors can be emitted.
Note that the bright layer 31 is not visible in an environment where light in the UV-B region or the UV-C region is irradiated, so it is not shown in FIG. Also, in FIG. 2(c-1), it is actually colored in silver.

Here, the thickness of each of the inks applied as the bright layer 31 and the transparent layer 32 is, for example, about 1 micrometer. In addition, the thickness of the ink is not limited to this. Also, for example, the thickness of the ink may vary depending on the material.
The above-described printing process is not limited to gravure printing, and may be wet offset printing, dry offset printing, letterpress printing, waterless lithographic printing, flexographic printing, screen printing, intaglio printing, and the like.

Next, in the printing area of a certain area printed in the printing process of the information recording medium 30, the printing condition expressed in % by which the base can be hidden is defined as the area ratio. The printing of the bright layer 31 and the transparent layer 32 will be described as a dot area ratio.
FIG. 3 is a diagram showing an example of an image of the bright layer 31 according to this embodiment.
FIG. 4 is a diagram showing an example of a pattern image of the transparent layer 32 according to this embodiment.

FIG. 3 shows an enlarged view of an image C1 (first image) of the bright layer 31 and a region E1 that is a part thereof. The bright layer 31 is a layer on which the image C1 is printed. The image C1 is an image in which a foreground portion C1a and a background portion C1b are expressed in binary, as shown in an area E1.
The foreground portion C1a constitutes a pattern image, and is printed with a halftone dot area ratio of 100%, for example.

The background portion C1b is for reducing the blank area where the base 11 is exposed, and constitutes a background image. The background portion C1b is printed with a halftone dot area ratio of 75%, for example. However, the halftone dot area ratio of the background portion C1b is an example and is not limited to this. That is, the halftone dot area ratio of the background portion C1b may be other than 75%. In this case, the halftone dot area ratio of the background portion C1b is preferably 50% or more and 70% or less with respect to the pattern image of the transparent layer 32 in order to improve the reading stability.

The foreground portion C1a and the background portion C1b are printed over the entire range constituting the bright layer 31. FIG. As a printing method, the foreground portion C1a and the background portion C1b may be printed at the same time, or the foreground portion C1a may be printed after the background portion C1b is printed. When the foreground portion C1a is printed after the background portion C1b is printed, the background portion C1b and the foreground portion C1a can have different colors.

FIG. 4A shows an enlarged view of an image C2 (second image) of the transparent layer and a region E2 that is a part thereof. The transparent layer 32 is a layer on which the image C2 is printed. The image C2 is a pattern image in which a foreground portion C2a and a background portion C2b are expressed in binary, as shown in an area E2.
The pattern image of this image C2 differs in code system from the pattern image of the foreground portion C1a described above. Details of the pattern image of the image C2 will be described later.

For example, the foreground portion C2a is printed with a halftone dot area ratio of 100%, and the background portion C2b is printed with a halftone dot area ratio of 25%, for example. However, this ratio is an example and is not limited to this. For example, the halftone dot area ratio of the foreground portion C2a may be less than 100%. The rate may be greater than or equal to 25% or less. Also, the density of the foreground portion C2a and the background portion C2b may be reversed.
Since such an image C2 of the transparent layer 32 of the information recording medium 30 is a pattern image, it is meaningless at first glance.

Here, the transparent layer 32 of the information recording medium 30 is not limited to one on which a pattern image including the foreground portion C2a and the background portion C2b is printed.
FIG. 4B shows a case where the image Cy of the transparent layer 32 is a pattern image consisting of only the foreground portion. In this case, the print area Cya of the image Cy is printed with a halftone dot area ratio of 100%, and the pattern image is expressed in binary by the print area Cya and the non-print area Cyb.

Next, pattern images of the transparent layer 32 shown in FIGS. 4A and 4B will be described.
A pattern image is an image generated by a specific rule. A pattern image can express characteristic points and lines in a spatial frequency domain that has been frequency-transformed by Fourier transform, for example. By performing conversion processing on the image C2 (or image Cy), the data after the conversion processing can express characteristic points, for example.
Here, the specific rule is not limited to Fourier transform, and may be other transform processes. For example, it may be a conversion process for a bar code, a conversion process for a two-dimensional code such as a QR code (registered trademark), or the like.

Next, the relationship between the wavelength of light in the transparent layer 32 and the visible image will be described together with a printing example of the pattern image of the transparent layer 32 .
FIG. 5 is a diagram showing a print example of the transparent layer 32 according to this embodiment.
FIG. 5A shows an image for code recognition, which is a transparent layer 32a printed with achromatic ink.
Further, FIG. 5B shows a design image which is a transparent layer 32b printed with a special fluorescent ink. The special fluorescent ink used in this example is a luminescent material that emits light in an environment where it is irradiated with light in the UV-C region.
Both the code recognition image and the pattern image are the same pattern image.

FIG. 5(C) shows the transparent layer 32 resulting from printing FIG. 5(B) on top of the printing of FIG. 5(A).
FIG. 5(D) shows a display mode when the transparent layer 32 of FIG. 5(C) is irradiated with light in the UV-C region. In this way, in an environment in which light in the UV-C region is irradiated, only the pattern image indicated by the transparent layer 32b is in a state of being illuminated by the special fluorescent ink.
It should be noted that the display state when normal light is applied to FIG. 5(C) is a colorless and transparent state as shown in FIG. 5(E).

Next, regarding the information recording medium 30 described above, the relationship between the observation angle (observation angle) and the visible image will be described.
FIG. 6 is a diagram for explaining an observation mode based on the structure of the information recording medium 30 according to this embodiment.
FIG. 6 illustrates three positional relationships among the illumination light source 21, the viewpoint 22, and the information recording medium 30 in the diffuse reflection area and the regular reflection (specular reflection) area. When the viewpoint 22 (22a) is at the position P1 with respect to the positions of the illumination light source 21 and the information recording medium 30, it means that the observation is made in the diffuse reflection area. Also, when the viewpoint 22 (22b) is at the position P2 with respect to the positions of the illumination light source 21 and the information recording medium 30, it means that the observation is made in the specular reflection area.
An image C1 and an image C2 shown in FIGS. 3 and 4A will be described below as an example.

When the information recording medium 30 is composed only of the bright layer 31, in the diffuse reflection area, a large difference in the amount of reflected light occurs due to the density difference between the foreground portion C1a and the background portion C1b of the image C1 in FIG. C1a and the background portion C1b can be distinguished, and the pattern image which is the foreground portion C1a can be recognized. On the other hand, in the specular reflection area, both the foreground portion C1a and the background portion C1b reflect large amounts of light, so that the difference cannot be perceived and the foreground portion C1a and the background portion C1b cannot be distinguished. That is, the pattern image, which is the foreground portion C1a, cannot be recognized in the specular reflection area.
In this way, the bright layer 31 uses ink of a bright material, so that the pattern image, which is the foreground portion C1a, can be displayed in various ways, such as being visible or invisible depending on the viewing angle.

Next, when the information recording medium 30 consists of only the transparent layer 32, the image C2 in FIG. 4A cannot be distinguished in the diffuse reflection area because it is transparent. On the other hand, in the specular reflection area, since the amount of reflected light varies depending on the density difference between the foreground portion C2a and the background portion C2b, the foreground portion C2a and the background portion C2b can be distinguished.
As described above, the transparent layer 32 is made of a material (such as ink) that reflects light in different amounts depending on the viewing angle, so that the pattern image, which is the image C2 of the transparent layer 32, can be seen or hidden depending on the viewing angle. You can show it.

When the information recording medium 30 has the transparent layer 32 formed on the bright layer 31, the pattern image, which is the foreground portion C1a, can be distinguished from the foreground portion C2a and the background portion C2b in the diffuse reflection area. , the pattern image, which is the foreground portion C1a, is observed as a whole. Further, in the specular reflection area, the foreground portion C1a and the background portion C1b cannot be distinguished, and the foreground portion C2a and the background portion C2b can be distinguished.
Therefore, the information recording medium 30 can be displayed in various ways such that the image of the bright layer 31 and the transparent layer 32 may or may not be visible depending on the viewing angle.

<Reproduction of printed matter 10>
Next, a case where the printed matter 10 is duplicated will be described.
FIG. 7 is a diagram for explaining the positional relationship between the illumination light source 21 and the camera 23 when copying the printed matter 10 according to this embodiment.
7A and 7B show the positional relationship between the illumination light source 21, the camera 23, and the printed matter 10 of a duplicating machine such as a copier. The image of the information recording medium 30 of the printed matter 10 is captured by the camera 23 while being irradiated with light from the illumination light source 21 shown in FIG. 7(A) or 7(B).

FIG. 7A shows a case where the illumination light source 21 and the camera 23 are positioned perpendicular to the information recording medium 30 and the camera 23 acquires an image. FIG. 7B shows a case where the illumination light source 21 irradiates the information recording medium 30 from a slightly oblique direction, and the camera 23 photographs the information recording medium 30 from a direction perpendicular to it to obtain an image. . In either case, the camera 23 captures images of both the bright layer 31 and the transparent layer 32 of the information recording medium 30 depending on the positional relationship between the illumination light source 21 and the information recording medium 30 .
Based on the image obtained by the camera 23 in this manner, a copy of the printed matter 10 is produced in the copier.

The copy product has a printed body (not shown) at a position corresponding to the information recording body 30 (see FIG. 1(A)) of the printed material 10 . The printed material has a composite image of the image of the bright layer 31 of the information recording medium 30 and the pattern image of the transparent layer 32 . Therefore, even when the printed material is observed at an observation angle from any area (diffuse reflection area, specular reflection area, etc.), only the composite image can be seen on the printed material. Therefore, only the pattern image of the transparent layer 32 cannot be observed on the printed material.

In addition, since the printed material is printed with commercially available ink, it does not emit light in an environment exposed to light such as UV-C region unlike special fluorescent ink. Therefore, by irradiating the printed matter with light in the UV-C region, it is possible to easily confirm that the copy having the printed matter is a counterfeit.

Furthermore, when the printed matter 10 is printed in monochrome, the printed matter has a layer made of black ink containing general carbon. On the other hand, if the print 10 is printed in color, the print will have layers of common CMYK inks.
On the other hand, as described above, the bright layer 31 of the information recording medium 30 of the printed matter 10 is produced using metallic ink.
Therefore, it becomes difficult to adjust the color represented by the metallic ink in the duplicating machine, and the printed material of the copy product has a different color tone from the information recording material 30 of the genuine printed material 10.例文帳に追加Also, it is difficult to copy transparent ink with a duplicating machine. Therefore, the copy product can be recognized as a counterfeit at a glance by the difference in color.

<Reading device 5>
Next, the reading device 5 (external device) that reads the code from the information recording medium 30 of the printed matter 10 will be described.
FIG. 8 is a functional block diagram of the reading device 5 according to this embodiment.
The reading device 5 is, for example, a mobile terminal typified by a smart phone.
The reading device 5 includes a control section 50 , a storage section 60 , a reading section 65 , a touch panel display 67 and a communication interface section 69 .
The control unit 50 is a CPU (central processing unit) that controls the entire reading device 5 . The control unit 50 reads and executes an OS (operating system) and application programs stored in the storage unit 60 to cooperate with the above-described hardware and execute various functions.
Control unit 50 includes image reception unit 51 , conversion unit 53 , and code identification unit 55 .

The image receiving portion 51 receives the image data of the information recording medium 30 via the reading section 65 as the information recording medium 30 is read by the reading section 65 .
The conversion unit 53 uses a conversion application 61b, which will be described later, to perform predetermined conversion on the image data received by the image reception unit 51, thereby acquiring data for code generation.
The code identification unit 55 refers to the code table 63 and identifies the code from the data acquired by the conversion unit 53 .

The storage unit 60 is a storage area such as a hard disk or a semiconductor memory device for storing programs, data, etc. necessary for the control unit 50 to execute various processes.
A computer is an information processing apparatus having a control unit, a storage device, etc. The reading device 5 is an information processing apparatus having a control unit 50, a storage unit 60, etc., and is included in the concept of a computer.
Storage unit 60 stores program storage unit 61 and code table 63 .
The program storage unit 61 is a storage area that stores various programs. The program storage unit 61 stores a control program 61a and a conversion application 61b. The control program 61 a is a program for executing each function of the control section 50 . The conversion application 61b is a dedicated application for reading codes called from the control program 61a. The control program 61 a and the conversion application 61 b are downloaded from, for example, an application distribution server (not shown) via the communication interface section 69 and stored in the program storage section 61 .
The code table 63 is a table that stores codes. The code table 63 stores in advance data corresponding to the pattern image of the transparent layer 32 and codes corresponding to the data.

The reading unit 65 is, for example, a camera, and is a device that acquires printed content such as images and characters as images. The information recording medium 30 of the printed matter 10 is read by the reading section 65 of the reading device 5 .
The touch panel display 67 has a function as a display section configured by a liquid crystal panel or the like, and a function as an input section for detecting touch input by a user's finger or the like.
The communication interface unit 69 is an interface for communicating with, for example, the distribution server described above.

<Processing of reading device 5>
Next, processing of the reading device 5 will be described.
FIG. 9 is a flowchart showing code identification processing in the reading device 5 according to this embodiment.
FIG. 10 is a diagram for explaining the relationship between the information recording medium 30 and reading processing according to this embodiment.
At step S (hereinafter simply referred to as “S”) 10 in FIG.
In S<b>11 , the control unit 50 (image receiving unit 51 ) reads an image on the information recording medium 30 via the reading unit 65 .

Here, the user can read the image with the reading unit 65 from an angle at which the pattern image of the transparent layer 32 of the information recording medium 30 can be read. Further, the user can read the image with the reading unit 65 from an angle at which the image of the bright layer 31 of the information recording medium 30 can be read. Furthermore, the user can read the image with the reading unit 65 from an angle at which the image of both the bright layer 31 and the transparent layer 32 of the information recording medium 30 can be read.
When specifying the code, the user specifies the specular reflection area where the transparent layer 32 is visible and reads the image from an angle at which the pattern image of the transparent layer 32 can be read. perform an operation.

Here, the image reading process will be described based on an example.
10A shows the transparent layer 32-2 of the information recording medium 30. FIG. FIG. 10B shows a transparent layer 32-3 of the information recording medium 30 having a smaller area than that shown in FIG. 10A.
In both the transparent layers 32-2 and 32-3, the transparent layer 32b forming the pattern image is printed in a state of being shifted with respect to the transparent layer 32a forming the code recognition image. there is Regarding the printing order of the transparent layer 32a forming the code recognition image and the transparent layer 32b forming the pattern image, either one may be printed first.
In order to read an image, the control unit 50 sets the reading start position to, for example, the upper left position 35, moves it to the right in the X direction from the position 35, and when it reaches the right end, returns to the left in the X direction. , downward in the Y direction and to the right in the X direction. By doing so, the control unit 50 reads the pattern image of the transparent layer 32 .

In S12 of FIG. 9, the control unit 50 (conversion unit 53) performs conversion processing on the read image and acquires data for code generation. The conversion process is executed by the conversion application 61b.
After the image received by the image receiving unit 51 is read, conversion processing is performed on the read image to acquire data for code generation.
The transparent layer 32-2 shown in FIG. 10(A) is large enough for the region of the transparent layer 32a constituting the code recognition image to acquire data for code generation. Therefore, even if the transparent layer 32b forming the pattern image is slightly misaligned, the control unit 50 can acquire data for code generation from the transparent layer 32-2. On the other hand, in the transparent layer 32-3 shown in FIG. 10B, the area of the transparent layer 32a constituting the code recognition image is small. Therefore, the control unit 50 cannot acquire data for code generation from the transparent layer 32-3. In the transparent layer 32-3, when the transparent layer 32b forming the pattern image is not displaced with respect to the transparent layer 32a forming the code recognition image, the control unit 50 controls the transparent layer 32-3. It may be possible to obtain data for code generation.

In S13 of FIG. 9, the control unit 50 (code identification unit 55) refers to the code table 63 and determines whether or not the code corresponding to the acquired data has been identified. If the code table 63 matches the acquired data, the code can be identified. If the code can be identified (S13: YES), the control unit 50 shifts the process to S14. On the other hand, if the code could not be specified (S13: NO), the control unit 50 shifts the process to S14a.
In S14, the control unit 50 causes the touch panel display 67 to display that the code has been identified. After that, the control unit 50 terminates this process. After completing this process, the control unit 50 performs a process based on the specified code.
On the other hand, in S14a, the control unit 50 causes the touch panel display 67 to display that there is an error. After that, the control unit 50 terminates this process.

When the user uses the reading device 5 and the reading unit 65 reads the image from an angle at which only the pattern image of the transparent layer 32 can be read, the control unit 50 obtains only the pattern image of the transparent layer 32 . Then, the control unit 50 executes the conversion application 61b, and if the area of the transparent layer 32a constituting the code recognition image is large enough to obtain data for code generation, the code (S12 in FIG. 9). Here, since the code corresponding to the pattern image of the transparent layer 32 is stored in the code table 63, the control unit 50 can identify the code (S13: YES in FIG. 9).
On the other hand, the control unit 50 executes the conversion application 61b, and if the area of the transparent layer 32a forming the code recognition image is not large enough to acquire data for code generation, the code (S12 in FIG. 9). Therefore, the code for the acquired data is not stored in the code table 63, and the control unit 50 cannot identify the code (S13 in FIG. 9: NO).

Further, when the reading unit 65 reads the image from an angle at which the user can read the pattern image of the transparent layer 32 and the image of the bright layer 31 using the reading device 5, the control unit 50 It is not possible to obtain only the pattern image of layer 32 . Even when the reading unit 65 reads the image from an angle at which only the image of the bright layer 31 can be read, the control unit 50 does not obtain only the pattern image of the transparent layer 32 . In such a case, the pattern image included in the image of the bright layer 31 has a code system different from that of the pattern image of the transparent layer 32 . Therefore, when the conversion application 61b is executed (S12 in FIG. 9), the control unit 50 cannot acquire data for specifying the code corresponding only to the pattern image of the transparent layer 32. FIG. Therefore, the code for the acquired data is not stored in the code table 63, and the control unit 50 cannot identify the code (S13 in FIG. 9: NO).

Thus, according to this embodiment, the following effects are obtained.
(1) The information recording medium 30 uses fluorescent ink for the transparent layer 32b forming the pattern image, which is a part of the transparent layer 32. For example, if light of a specific wavelength corresponding to the fluorescent ink is irradiated, A pattern image appears. Therefore, the pattern image can be visually recognized, and the authenticity of the information recording medium 30 can be easily determined by the presence or absence of the pattern image.
In addition, of the transparent layers 32, which are printed layers using transparent ink, at least the transparent layer 32a forming the code recognition image is used as a pattern image, so that the transparent layer 32a forming the code recognition image can be seen visually. It can be hard to recognize.
Since the transparent layer 32 is arranged over the bright layer 31, the transparent layer 32 can be made more difficult to visually recognize.

(2) In the information recording medium 30, the transparent layer 32b forming the pattern image is used as a pattern image, so that the transparent layer 32a forming the image for code recognition is formed from the transparent layer 32, which is a printed layer using transparent ink. can be made more difficult to visually recognize. Further, if the code recognition image and the pattern image are printed without deviation, the processing time until the reading device 5 acquires the data can be shortened.
(3) In the information recording medium 30, the area of the transparent layer 32a that constitutes the code recognition image is sized so that data corresponding to the code can be generated, so that the reading device 5 constitutes the code recognition image. Data can be obtained from the transparent layer 32a. By doing so, the code can be obtained from the transparent layer 32a forming the image for code recognition.

(4) The information recording medium 30 uses a special fluorescent ink that emits light in the UV-B region or the UV-C region for the transparent layer 32b that constitutes the pattern image. Ink glows. This is because normal light and black light that irradiates light in the UV-A region do not emit light, making it difficult to duplicate the pattern image, and light in the UV-B region or UV-C region emits light. can be seen, the authenticity of the information recording medium 30 can be easily determined.
Special fluorescent ink that emits light in the UV-B region or UV-C region is not commercially available, making counterfeiting more difficult.

(5) In the information recording medium 30, the bright layer 31 is composed of a background portion C1b forming a background image with a halftone dot area ratio of 50% to 70% and a foreground portion C1a forming a pattern image with a halftone dot area ratio of 100%. Consists of Therefore, the transparent layer 32 can be easily recognized at a specific viewing angle at which the transparent layer 32 can be recognized.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Moreover, the effects described in the embodiments are merely enumerations of the most suitable effects produced by the present invention, and the effects of the present invention are not limited to those described in the embodiments. The above-described embodiments and modifications described later can be used in combination as appropriate, but detailed description thereof will be omitted.

(deformed form)
(1) In the present embodiment, as the transparent layer 32 made of transparent achromatic ink, the transparent layer 32a forming the code recognition image is made of achromatic ink, and the transparent layer 32b forming the pattern image is made of special color ink. Although the fluorescent ink has been described as an example, it is not limited to this. For example, the transparent layer 32a forming the code recognition image may be made of special fluorescent ink. In that case, the transparent layer 32a forming the code recognition image may be colored differently from the transparent layer 32b forming the pattern image so that it can be distinguished from the transparent layer 32b forming the pattern image. In this way, it is difficult to forge because it is difficult to understand visually.
Also, the transparent layer 32b forming the pattern image is made of fluorescent ink that emits light under black light, such as ink in the UV-A range, which has an ultraviolet wavelength of about 315 to 380 nm, instead of the UV-C range. There may be.
Furthermore, although the bright layer 31 uses a single color ink as an example, it may use a plurality of colors of ink.

(2) In the present embodiment, both the code recognition image and the pattern image forming the image C2 of the transparent layer 32 are pattern images. However, the present invention is not limited to this. The design image may not be a pattern image.

(3) In the present embodiment, the bright layer 31 and the transparent layer 32 have been described as having a square shape, but they are not limited to this. The bright layer 31 and the transparent layer 32 may have other shapes such as a rectangular shape, a circular shape, and an elliptical shape. Further, although the transparent layer 32b forming the pattern image has been described as having a star pattern, it may have other shapes and patterns such as heart patterns and triangles.

(4) In the present embodiment, the image C2 of the transparent layer 32 is composed of two divided images, ie, the code recognition image and the pattern image. However, the present invention is not limited to this. It may be composed of three or more divided images, and for example, there may be a plurality of pattern images.

(5) In the present embodiment, an example in which the transparent layer 32 is formed directly on the bright layer 31 has been described, but the present invention is not limited to this. For example, a substrate such as a transparent film may be provided between the bright layer 31 and the transparent layer 32 . Further, for example, in contrast to the case where the transparent layer 32 is formed on the bright layer 31 described in the present embodiment, even if the transparent layer 32 further has a substrate such as a transparent film, good.

(6) In the present embodiment, the printed matter 10 having the information recording medium 30 has been described as an example of a ticket, but it is not limited to this. For example, it may be an ID card or a card medium used in a game. Also, other than the ticket, the copied product may be a printed matter such as a paper medium that has no monetary value, or a label for security protection, etc., although it itself has a monetary value. . Furthermore, a booklet such as a passport may be used.
(7) In the present embodiment, an example of printing a pattern image has been described, but the present invention is not limited to this. A pattern image may be formed by a method other than printing such as transfer or laser drawing.

(8) In the present embodiment, the mobile terminal is used as an example of the reading device, but the present invention is not limited to this. For example, it may be a personal computer. The reading unit may be a scanner or the like.

5 reading device 10 printed matter 21 illumination light source 23 camera 30 information recording medium 31 bright layer 32, 32a, 32b transparent layer 50 control section 60 storage section 61a control program 61b conversion application 63 code table 65 reading section C1, C2, Cy image C1a background Image C1b Pattern image

Claims (7)

An information recording medium having a composite image including a first image and a second image formed on the first image,
The first image is an image formed of a glitter material,
the second image is formed of a transparent material and includes at least a first split image and a second split image;
The first divided image is a pattern image generated according to a specific rule, and is configured so that the amount of reflected light varies depending on the viewing angle,
In the first divided image, a fluorescent material that emits light in the UV-B region or the UV-C region is applied to the transparent material,
The second divided image is obtained by applying a fluorescent material to the transparent material,
The composite image is recognizable from the first divided image at a specific viewing angle, and is recognizable from the second divided image at a specific wavelength ,
The information recording medium , wherein the synthesized image is recognizable with ultraviolet rays having wavelengths in the UV-B region and the UV-C region . In the information recording medium according to claim 1,
The second divided image is a pattern image generated according to the rule, and is configured such that the amount of reflected light varies depending on the observation angle,
The information recording medium, wherein the synthesized image allows recognition of the second image including the first divided image and the second divided image at the specific viewing angle. In the information recording medium according to claim 1 or claim 2,
The area of the first divided image has a size capable of generating data corresponding to a code by performing conversion processing corresponding to the rule on the first divided image. In the information recording medium according to any one of claims 1 to 3,
In the second divided image, the fluorescent material that emits light in the UV-B region or the UV-C region is applied to the transparent material,
the first divided image and the second divided image emit light of different colors;
The information recording medium, wherein the composite image is one in which the second divided image can be further recognized in ultraviolet rays having wavelengths in the UV-B region and the UV-C region. In the information recording medium according to any one of claims 1 to 4 ,
The first image is composed of a background image and a pattern image,
The background image is configured with a halftone dot area ratio of 50% or more and 70% or less,
The information recording medium, wherein the pattern image has a halftone dot area ratio of 100%. A medium comprising the information recording medium according to any one of claims 1 to 5 . A booklet comprising the information recording medium according to any one of claims 1 to 5 .

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