JP7351108B2 - Information records, media and booklets - Google Patents

Description

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

2. Description of the Related Art Conventionally, there is a technology for digital watermarking that embeds specific information in images and the like. If this technology is used in printed matter, it is possible to embed information at a level that humans cannot visually recognize, without damaging the artistic effect of the printed matter. Furthermore, information embedded in printed matter can be read by a reading device.

When using this embedded information, for example, to determine authenticity, it is desirable that the embedded information be difficult to infer from a duplicate. Therefore, a technique related to an information recording medium that is devised so that embedded information is difficult to be estimated has been disclosed (for example, Patent Document 1).

Japanese Patent Application Publication No. 2016-93895

The device described in Patent Document 1 has a problem in that reading of the transparent layer is unstable if there is a blank area in the bright layer. On the other hand, if you eliminate blank areas and completely cover the entire surface of the glitter layer with ink, as in solid printing, the reading of the transparent layer will be stable, but the information on the transparent layer will be easier to find, making it more susceptible to forgery. turn into.

An object of the present invention is to provide an information recording body, a medium, and a booklet that are hard to be forged and have high readability.

The present invention solves the above problems by the following solving means.
A first invention is an information recording medium comprising a composite image including a base image, a first image formed on the base image, and a second image formed on the first image. The base image is an image formed of a glitter material and has a dot area ratio of 50% to 70%, the first image is formed of a glitter material, and the second image is a transparent image. The first image and the second image are different pattern images generated according to specific rules, and each is configured to have a different amount of reflected light depending on the viewing angle, and the composite image is The information recording body is capable of recognizing at least one of the first image and the second image.
A second invention is the information recording medium according to the first invention, wherein the second image is formed within a base image area in which the base image is formed.
A third invention is the information recording body according to the first invention or the second invention, wherein the base image and the first image are formed of the glittering material of different colors. It is.
A fourth invention is an information recording medium according to any one of the first invention to the third invention, wherein the base image is an irregular halftone dot image.
A fifth invention is the information recording medium according to the fourth invention, wherein the base image is an image obtained by FM screening.
A sixth invention is a medium comprising the information recording body according to any one of the first invention to the fifth invention.
A seventh invention is a booklet comprising any of the information recording bodies according to the first invention to the fifth invention.

According to the present invention, it is possible to provide an information recording body, a medium, and a booklet that are hard to be forged and have high readability.

FIG. 3 is a diagram for explaining a printed matter according to the present embodiment. FIG. 3 is a diagram showing an example of a base image of a glitter base layer according to the present embodiment. FIG. 3 is a diagram showing an example of a first image of the bright information layer according to the present embodiment. It is a figure which shows the example of the 2nd image of the transparent layer based on this embodiment. FIG. 3 is a diagram for explaining an observation mode based on the structure of an information recording body according to the present embodiment. FIG. 3 is a diagram showing reading results associated with changes in the dot area ratio in the bright base layer of the information recording medium according to the present embodiment. FIG. 3 is a diagram for explaining the positional relationship between an illumination light source and a camera when copying a card according to the present embodiment. FIG. 2 is a functional block diagram of a reading device according to the present embodiment. It is a flowchart which shows the code identification process in the reading device concerning this embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that 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.
<Printed material 10>
The printed matter 10 (medium) shown in FIG. 1(A) is, for example, a ticket such as an admission ticket. FIG. 1(A) shows a plan view of the printed material 10 viewed from above in the vertical direction Z. For example, the printed matter 10 itself has monetary value, but a copy of the printed matter 10 has no monetary value. The printed matter 10 includes a base 11 and an information recording body 30.
The base 11 is a base material that is the basis of the printed matter 10, and is made of white paper, for example. Note that the base 11 is not limited to white paper, and may be made of other materials such as high-quality paper, coated paper, tack paper, plastic card, film, etc. as long as it has a flat surface capable of supporting a printed image. In this example, the printed image applied to the printed material 10 is related to the content of the ticket.

<Structure of information recording body 30>
An information recording body 30 is provided on the front side of the base 11, that is, on the upper side in the Z direction. The information recording body 30 has information used for determining authenticity, such as a code, printed thereon by latent image printing. The image printed on the information recording medium 30 changes by changing the observation direction of the base 11.
FIG. 1(B) is a partial schematic diagram of a cross section taken along line GG in FIG. 1(A). FIG. 1(B) shows a cross-sectional view of the printed matter 10 viewed from the front in the Y direction. As shown in FIG. 1(B), the information recording body 30 includes a bright base layer 31, a bright information layer 32, and a transparent layer 33 on the base 11.

The glitter base layer 31 is a layer in which a base image, which is an irregular pattern image (halftone image), is printed with ink containing a glitter material.
The glitter information layer 32 is a layer on which a first image, which is a pattern image, is printed with ink containing a glitter material. Here, the first image formed by the bright information layer 32 is, for example, a code readable by a reading device 5, which will be described later.
The transparent layer 33 is a layer on which a second image, which is a pattern image different from the pattern image of the glitter information layer 32, is printed using ink of a transparent material. Here, the second image formed by the transparent layer 33 is, for example, a code readable by the reading device 5 described later.
In this example, the glitter base layer 31, the glitter information layer 32, and the transparent layer 33 are all square-shaped, and the transparent layer 33 is formed over the entire glitter base layer 31.

Here, a method for manufacturing the information recording body 30 will be briefly described.
First, a base 11 on which the contents of a ticket have been printed in advance is prepared, and a base image is gravure printed as a glitter base layer 31 on the base 11 using a gloss ink containing a glitter material.
Next, on the image of the glitter base layer 31, a first image is overlaid and gravure printed as a glitter information layer 32 using a gloss ink containing a glitter material.
As the ink for drawing the base image and the first image, various types of ink are assumed, for example, as exemplified below.
For example, it may be a silver ink containing aluminum powder, copper powder, zinc powder, tin powder, iron phosphide, or the like. Alternatively, the ink may be a mixture of silver ink and chromatic ink containing colored pigments containing pigments and dyes.

Furthermore, the ink for drawing the glitter base layer 31 and the glitter information layer 32 may be an ink made only of a glitter material exhibiting a bluish gold color or a reddish gold color. Alternatively, the ink of a glittering material exhibiting a bluish golden color or a reddish golden color may be mixed with a chromatic ink containing 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 be used. Note that the pearl ink is an ink containing a pearl pigment that has a pearlescent luster compared to ordinary pigments, and has safety, gloss, and a luxurious feel. Liquid crystal ink is an ink containing liquid crystal that has the property of changing color depending on temperature.

Note that the ink for drawing the glitter base layer 31 and the glitter information layer 32 may be the same colored ink but made of different materials, or may be made of the same material or different colored inks made of different materials. .

Next, on the first image of the glitter information layer 32, a second image is superimposed as a transparent layer 33 using transparent ink or the like and gravure printed. The ink for drawing the second image is, for example, an achromatic ink such as matte OP varnish, transparent varnish, ink varnish, transparent ink, or medium ink. Note that these inks may be any printing ink such as ultraviolet curing ink, oxidative polymerization ink, penetrating ink, superheat drying ink, evaporation drying ink, etc.

Here, the thickness of the ink applied as the glitter base layer 31, the glitter information layer 32, and the transparent layer 33 is, for example, about 1 micrometer. Note that the thickness of the ink is not limited to this. Further, for example, the thickness of the ink may be changed depending on the material.
The above-mentioned printing process is not limited to gravure printing, but may also be wet offset printing, dry offset printing, letterpress printing, waterless lithographic printing, flexo printing, screen printing, intaglio printing, etc.

Next, in a printing area of a certain area printed in the printing process of the information recording body 30, the area ratio is the area where the base can be hidden, expressed as a percentage, and the area ratio is the area where the base can be hidden by halftone dots. The printing of the bright base layer 31, bright information layer 32, and transparent layer 33 will be explained in terms of point area ratio.
FIG. 2 is a diagram showing an example of a base image of the bright base layer 31 according to the present embodiment.
FIG. 3 is a diagram showing an example of the first image of the bright information layer 32 according to the present embodiment.
FIG. 4 is a diagram showing an example of the second image of the transparent layer 33 according to this embodiment.

FIG. 2 shows an image B including an image B1 and an image B2 that can be applied as a base image of the glitter base layer 31.
Image B, in this example, is an irregular pattern image called an FM screen. Image B shows irregular pattern images ranging from image B0 with a halftone dot area ratio of 0% to image B3 with a halftone dot area ratio of 100%. Among images B, those suitable as base images are from image B1 with a halftone dot area ratio of 50% to image B2 with a halftone dot area ratio of 70%.
The bright base layer 31 is used to stabilize the reading of the transparent layer 33. Therefore, it is desirable to use images ranging from image B1 with a halftone dot area ratio of 50% to image B2 with a halftone dot area ratio of 70%. Note that a suitable halftone area ratio of image B will be described later.

FIG. 3 shows an enlarged image of the image C1 (first image) of the bright information layer 32 and a region E1 that is a part of the image C1. The glitter information layer 32 is a layer on which the image C1 is printed. The image C1 is a binary pattern image represented by a printing area C1a and a non-printing area C1b, as shown in an area E1.
The printing area C1a is printed with a halftone dot area ratio of 100%, for example.
The non-print area C1b is an area where no printing is performed.

FIG. 4 shows an enlarged image of an image C2 (second image) of the transparent layer and a region E2 that is a part thereof. The transparent layer 33 is a layer on which the image C2 is printed. The image C2 is a binary pattern image represented by a printing area C2a and a non-printing area C2b, as shown in an area E2.
The pattern image shown by the print area C2a of this image C2 and the pattern image shown by the print area C1a of the image C1 described above have different code systems.

Next, the image C2 of the transparent layer 33 shown in FIG. 4 will be described.
Image C2 is an image generated according to a specific rule. The image C2 can represent characteristic points and lines in a spatial frequency domain that is frequency-transformed by performing Fourier transformation, for example. By performing the conversion process on the image C2, the data after the conversion process can represent, for example, characteristic points.
Here, the specific rule is not limited to Fourier transform, but may be other transform processing. For example, it may be a conversion process for a barcode, a conversion process for a two-dimensional code such as a QR code (registered trademark), or the like.

Note that the image C1 of the bright information layer 32 shown in FIG. 3 is also similar to the image C2 of the transparent layer 33, and by performing the conversion process on the image C1, the data after the conversion process is can represent points. However, the image C1 of the bright information layer 32 and the image C2 of the transparent layer 33 are different pattern images generated according to a specific rule.
Moreover, since the image C1 of the bright information layer 32 and the image C2 of the transparent layer 33 of the information recording body 30 are pattern images, they are meaningless images when viewed by a person at first glance.

As a method for manufacturing this information recording body 30, for example, a bright base layer 31 is printed on the base 11 in advance by, for example, offset printing.
Next, the bright information layer 32 and transparent layer 33 are printed according to the customer's requirements.
Here, as described above, the base image printed on the bright base layer 31 is an irregular pattern image formed by halftone dots such as an FM screen, so it cannot be printed finely by offset printing or gravure printing. It is desirable to do so.
On the other hand, the first image printed on the glitter information layer 32 may be an image rougher than an irregular pattern image formed by halftone dots such as an FM screen. Therefore, the first image printed on the glitter information layer 32 is not limited to offset printing or gravure printing, but may be printed by various manufacturing methods such as a toner printer or foil transfer.

Next, regarding the information recording body 30 described above, the relationship between the viewing viewpoint angle (observation angle) and the visible image will be explained.
FIG. 5 is a diagram for explaining an observation mode based on the structure of the information recording body 30 according to this embodiment.
FIG. 6 is a diagram showing a reading result 40 associated with a change in the dot area ratio in the bright base layer 31 of the information recording medium 30 according to the present embodiment.

FIG. 5 illustrates three positional relationships among the illumination light source 21, the viewpoint 22, and the information recording body 30 in the diffuse reflection area and the regular reflection (specular reflection) area. When the viewpoint 22 (22a) is located at the position P1 with respect to the positions of the illumination light source 21 and the information recording body 30, observation is performed in a diffuse reflection area. Further, when the viewpoint 22 (22b) is located at the position P2 with respect to the positions of the illumination light source 21 and the information recording body 30, it means that the observation is made in a specular reflection area.
In the following, the image C1 and the image C2 shown in FIGS. 3 and 4 will be described as examples.

When the information recording body 30 consists only of the bright information layer 32, in the diffuse reflection area, there is a large difference in the amount of reflected light due to the difference in density between the print area C1a and the non-print area C1b of the image C1 in FIG. The print area C1a and the non-print area C1b can be distinguished, and the pattern image that is the print area C1a can be recognized. On the other hand, in the specular reflection area, since both the printing area C1a and the non-printing area C1b have a large amount of reflected light, the difference cannot be sensed, and the printing area C1a and the non-printing area C1b cannot be distinguished. That is, in the specular reflection area, the pattern image that is the print area C1a cannot be recognized.
In this way, the glitter information layer 32 can be made to appear in various ways, such as the pattern image that is the print area C1a being visible or invisible depending on the viewing angle, by using the ink of the glitter material.

Next, when the information recording body 30 consists of only the transparent layer 33, the image C2 in FIG. 4 is transparent and cannot be distinguished in the diffuse reflection area. On the other hand, in the regular reflection area, the amount of reflected light changes depending on the density difference between the printing area C2a and the non-printing area C2b, so the printing area C2a and the non-printing area C2b can be distinguished.
In this way, the transparent layer 33 uses a material (such as ink) that changes the amount of reflected light depending on the viewing angle, so that the pattern image, which is the image C2 of the transparent layer 33, may or may not be visible depending on the viewing angle. You can make it look like this.

Next, in the case where the information recording body 30 includes a glitter base layer 31, a glitter information layer 32, and a transparent layer 33, the pattern image that is the print area C1a cannot be distinguished in the diffuse reflection area. , since the printing area C2a and the non-printing area C2b cannot be distinguished, the pattern image of the printing area C1a is observed as a whole.
Further, in the specular reflection area, the printing area C1a and the non-printing area C1b cannot be distinguished, but the printing area C2a and the non-printing area C2b can be distinguished.
Therefore, the information recording body 30 can be displayed in various ways, such as images of the bright information layer 32 and the transparent layer 33 being visible or invisible depending on the viewing angle.

However, since the glitter base layer 31 is located at the base of the glitter information layer 32, the base image forming the glitter base layer 31 overlaps with the non-print area C1b. Furthermore, when the dot area ratio of the bright base layer 31 is low, many blank areas occur, making it unstable to read the transparent layer 33. Therefore, when reading the bright information layer 32 and the transparent layer 33, it is necessary to consider the dot area ratio of the base image of the bright base layer 31.

FIG. 6 shows the reading results 40 of the image C1 and the image C2 when the dot area ratio of the bright base layer 31 is changed. The reading result of the image C1 is shown in the code reading result of the bright information layer 32 of the reading result 40. An "o" in the code reading result of the bright information layer 32 indicates that the code could be read, and an "x" indicates that the code could not be read. According to the reading result 40, if the dot area ratio of the base image of the bright base layer 31 was 70% or less, a pattern image that was the print area C1a was observed, and the image C1 could be read. On the other hand, when the dot area ratio of the base image of the bright base layer 31 was 80%, the base image of the bright base layer 31 resulted in obstructing the reading of the pattern image, which is the print area C1a.

Further, the reading result of the image C2 is shown in the reading result 40 of the code reading result of the transparent layer 33. "◎" and "○" in the result of reading the code of the transparent layer 33 indicate that the code could be read, and "x" indicates that it could not be read. According to the reading result 40, if the dot area ratio of the base image of the bright base layer 31 was 50% or more, a pattern image that was the print area C2a was observed, and the image C2 could be read. On the other hand, when the dot area ratio of the base image of the bright base layer 31 was 40% or 30%, the base image of the bright base layer 31 itself had many blank areas, making reading unstable. In addition, when the dot area ratio of the base image of the bright base layer 31 is 50% (indicated by "○" in the figure), those with a dot area ratio of 60% or more (indicated by "◎" in the figure) ), it was necessary to adjust the reading angle more precisely. In other words, those having a halftone dot area ratio of 60% or more are easy to read without strict adjustment of the reading angle and have excellent reading stability.
According to the reading result 40, if the dot area ratio of the base image of the bright base layer 31 is from 50% or more to 70% or less, the image C1 and the image C2 can be viewed at each readable observation angle. I was able to read it from. Further, a more preferable range was a range in which the dot area ratio of the base image of the bright base layer 31 was from 60% or more to 70% or less.

<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 the present embodiment.
7(A) and 7(B) show the positional relationship between the illumination light source 21, camera 23, and printed matter 10 of a duplicating machine such as a copying machine. An image of the information recording body 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 FIG. 7(B).

FIG. 7A shows a case where the illumination light source 21 and the camera 23 are positioned perpendicularly to the information recording medium 30, and the camera 23 acquires an image. Further, FIG. 7(B) shows a case where the illumination light source 21 illuminates the information recording medium 30 from a slightly oblique direction, and the camera 23 photographs the information recording medium 30 from a vertical direction to obtain an image. . In either case, the camera 23 can capture all images of the bright base layer 31, bright information layer 32, and transparent layer 33 of the information recording body 30, depending on the positional relationship between the illumination light source 21 and the information recording body 30. .
In this way, based on the image obtained by the camera 23, a copy of the printed matter 10 is produced in the duplicating machine.

The copy product has a printed material (not shown) at a position corresponding to the information recording material 30 (see FIG. 1(A)) of the printed material 10. The printed body has a composite image of a base image of the glitter base layer 31 of the information recording body 30, a first image of the glitter information layer 32, and a second image of the transparent layer 33. Therefore, no matter which viewing angle the printed material is viewed from any region (diffuse reflection region, specular reflection region, etc.), only the composite image will be visible. Therefore, in the printed body, for example, only the second image of the transparent layer 33 cannot be observed, and only the first image of the glitter information layer 32 cannot be observed.

Further, when the printed matter 10 is printed in monochrome, the printed material has a layer made of a general black ink containing carbon. On the other hand, when the printed material 10 is printed in color, the printed material has a layer made of common CMYK inks.
On the other hand, as described above, the glitter base layer 31 and the glitter information layer 32 of the information recording body 30 of the printed matter 10 are produced using metallic ink.
Therefore, in the duplicating machine, it becomes difficult to adjust the color expressed by the metallic ink, and the printed matter of the copied product has a different color tone from the information recording body 30 of the genuine printed matter 10. Also, it is difficult to copy transparent ink with a duplicating machine. Therefore, it is easy to tell at a glance that a copy is a fake based on the difference in color.

<Reading device 5>
Next, the reading device 5 (external device) that reads the code from the information recording body 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 smartphone.
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 cooperates with the above-mentioned hardware and executes various functions by appropriately reading and executing the OS (operating system) and application programs stored in the storage unit 60.
The control unit 50 includes an image reception unit 51, a conversion unit 53, and a code identification unit 55.

The image receiving unit 51 receives image data of the information recording body 30 via the reading unit 65 when the reading unit 65 reads the information recording body 30 .
The conversion unit 53 performs a predetermined conversion on the image data received by the image reception unit 51 using a conversion application 61b to be described later, and obtains 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.
Note that a computer refers to an information processing device equipped with a control section, a storage device, etc., and the reading device 5 is an information processing device equipped with a control section 50, a storage section 60, etc., and is included in the concept of computer.

The storage unit 60 stores a program storage unit 61 and a 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 61a is a program for executing each function of the control unit 50. The conversion application 61b is a dedicated application for reading codes, which is called from the control program 61a. The control program 61a and the conversion application 61b are downloaded from, for example, an application distribution server (not shown) via the communication interface section 69, and are stored in the program storage section 61.
The code table 63 is a table that stores codes. For example, the code table 63 stores in advance data corresponding to the second image of the transparent layer 33 and a code corresponding to the data.

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

<Processing of reading device 5>
Next, the processing of the reading device 5 will be explained.
FIG. 9 is a flowchart showing code identification processing in the reading device 5 according to this embodiment.
In step S (hereinafter simply referred to as "S") 10 of FIG. 9, the control section 50 of the reading device 5 activates the reading section 65.
In S11, the control unit 50 (image reception unit 51) reads the image contained in the information recording body 30 via the reading unit 65.

Here, the user can read the second image using the reading unit 65 from an angle that allows the second image of the transparent layer 33 of the information recording body 30 to be read. Further, the user can read the first image using the reading unit 65 from an angle that allows reading the first image included in the bright information layer 32 of the information recording body 30. Furthermore, the user reads the first image and the second image by moving the reading unit 65 from an angle that allows reading both the first image of the bright information layer 32 of the information recording body 30 and the second image of the transparent layer 33. Can be read.
When specifying the code, the user reads the image from an angle that allows the second image of the transparent layer 33 to be read, for example, specifies the specular reflection area where the transparent layer 33 is visible and reads the image. Perform the following operations.

In S12, the control unit 50 (conversion unit 53) performs conversion processing on the read image and obtains data for code generation. The conversion process is executed by the conversion application 61b.
After reading the image received by the image receiving unit 51, a conversion process is performed on the read image to obtain data for code generation.

In S13, the control unit 50 (code identifying unit 55) refers to the code table 63 and determines whether the code corresponding to the acquired data has been identified. If there is something in the code table 63 that matches the acquired data, the code can be identified. If the code has been identified (S13: YES), the control unit 50 moves the process to S14. On the other hand, if the code cannot be identified (S13: NO), the control unit 50 moves the process to S14a.
In S14, the control unit 50 displays on the touch panel display 67 that the code has been identified. After that, the control unit 50 ends this process. Note that after finishing 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 an error message. After that, the control unit 50 ends this process.

When the user uses the reading device 5 and the reading unit 65 reads the image from an angle that allows reading only the second image of the transparent layer 33, the control unit 50 obtains only the second image of the transparent layer 33. . Then, the control unit 50 executes the conversion application 61b and acquires data for identifying the code (S12 in FIG. 9). Here, since the code corresponding to the second image of the transparent layer 33 is stored in the code table 63, the control unit 50 can identify the code (S13 in FIG. 9: YES).

On the other hand, when the user uses the reading device 5 to read the images from an angle that allows the reading unit 65 to read the second image of the transparent layer 33 and the first image of the glitter information layer 32, the control unit 50 does not obtain only the second image of the transparent layer 33. Even when the reading unit 65 reads the image from an angle that allows reading the base image of the bright base layer 31 and the first image of the bright information layer 32, the control unit 50 reads only the second image of the transparent layer 33. I never get it. In such a case, the pattern image that is the first image of the bright information layer 32 has a different code system from the pattern image that is the second image of the transparent layer 33. Therefore, when the control unit 50 executes the conversion application 61b (S12 in FIG. 9), the control unit 50 cannot acquire data for specifying the code corresponding only to the pattern image that is the second image of the transparent layer 33. 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).

As described above, the present embodiment has the following effects.
(1) The information recording body 30 includes a bright base layer 31 below the bright information layer 32 and the transparent layer 33, which has a base image having a dot area ratio of 50% or more and 70% or less. Then, the transparent layer 33 is formed within the area of the bright base layer 31. Since the bright base layer 31 gives a glossy appearance to the transparent layer 33, stable reading by the reading device 5 can be achieved.

(2) By forming the glitter base layer 31 and the glitter information layer 32 using glitter materials of different colors, it is possible to make it more difficult to adjust the color in a copying machine, for example. Therefore, the information recording body 30 can be made more difficult to forge.
(3) By making the image of the bright base layer 31 into an irregular halftone dot image, moiré, which is a striped pattern caused by interference between halftone dots, can be made less likely to occur.
Moreover, by using an image obtained by FM screening as the image of the bright base layer 31 as irregular halftone dots, it becomes difficult to forge, and security is improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. Further, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. In addition, although the embodiment mentioned above and the modification mentioned later can be used in combination suitably, detailed description is abbreviate|omitted.

(Deformed form)
(1) In the present embodiment, the transparent layer 33 is explained using a single layer structure as an example, but the structure is not limited to this. For example, a base layer may be provided in the transparent layer, and a two-layer structure including a layer having information and a halftone dot area ratio of 100% may be used. In this way, the structure of the transparent layer becomes more complex, making it more difficult to fake.

(2) In the present embodiment, the base image of the bright base layer 31 has been explained using an FM screening image as an example, but the base image is not limited to this. Other irregular halftone dot images may also be used.

(3) In this embodiment, the glitter base layer 31, the glitter information layer 32, and the transparent layer 33 are described as having a square shape, but they are not limited to this. The bright base layer 31, the bright information layer 32, and the transparent layer 33 may have other shapes such as a rectangular shape, a circular shape, an elliptical shape, or the like.

(4) In this embodiment, the transparent layer 33 is formed directly on the bright information layer 32, but the present invention is not limited thereto. For example, a base material such as a transparent film may be provided between the bright information layer 32 and the transparent layer 33. Furthermore, for example, in contrast to the one in which the transparent layer 33 is formed on the glitter information layer 32 described in this embodiment, a base material such as a transparent film may be further provided on the transparent layer 33. Good too.

(5) In the present embodiment, the printed matter 10 having the information recording body 30 has been described using a ticket as an example, but the present invention is not limited to this. For example, it may be an ID card or a card medium used in a game. In addition, other than tickets, although the copy itself has monetary value, it may be a printed matter such as a paper medium that does not have monetary value, or it may be a security protection label, etc. . Furthermore, a booklet such as a passport may be used.
(6) In this embodiment, the image of each layer is obtained by printing as an example, but the present invention is not limited to this. The pattern image of the bright information layer or transparent layer may be formed by a method other than printing, such as transfer or laser drawing.

(7) In the present embodiment, the reading device is described using a mobile terminal as an example, 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 body 31 Bright base layer 32 Bright information layer 33 Transparent layer 50 Control section 60 Storage section 61a Control program 61b Conversion application 63 Code table 65 Reading section B, B0 to B3, C1 , C2 Image C1a, C2a Print area C1b, C2b Non-print area

Claims (9)

An information recording body comprising a composite image including a base image, a first image formed on the base image, and a second image formed on the first image,
The base image is an image formed of a glittering material and has a dot area ratio of 50% or more and 70% or less,
The first image is formed of a glitter material of a different color from the base image,
The second image is formed of a transparent material,
The first image and the second image are
are different pattern images generated by specific rules,
Each is configured so that the amount of reflected light differs depending on the viewing angle.
In the composite image, at least one of the first image and the second image can be recognized depending on the viewing angle.
Information record. a base image, a first image formed on the base image, a second base image formed on the first image, and a second image formed on the second base image. An information recording medium comprising a composite image including:
The base image is an image formed of a glittering material and has a dot area ratio of 50% or more and 70% or less,
the first image is formed of a glittering material;
The second image is an image formed of a transparent material and has a dot area ratio of 100%,
The second base image is formed of a transparent material,
The first image and the second image are
are different pattern images generated by specific rules,
Each is configured so that the amount of reflected light differs depending on the viewing angle.
In the composite image, at least one of the first image and the second image can be recognized depending on the viewing angle.
Information record. In the information recording body according to claim 2 ,
The base image and the first image are formed of the glitter material of different colors,
Information record. An information recording body comprising a composite image including a base image, a first image formed on the base image, and a second image formed on the first image,
a base material on the first image, and the second image is formed on the base material,
the base material is transparent;
The base image is an image formed of a glittering material and has a dot area ratio of 50% or more and 70% or less,
the first image is formed of a glittering material;
The second image is formed of a transparent material,
The first image and the second image are
are different pattern images generated by specific rules,
Each is configured so that the amount of reflected light differs depending on the viewing angle.
In the composite image, at least one of the first image and the second image can be recognized depending on the viewing angle ,
The base image and the first image are formed of the glitter material of different colors ,
Information record. In the information recording body according to any one of claims 1 to 4,
the second image is formed within a base image area in which the base image is formed;
Information record. In the information recording body according to any one of claims 1 to 5,
the base image is an irregular halftone image;
Information record. The information recording body according to claim 6,
The base image is an image obtained by FM screening,
Information record. A medium comprising the information recording body according to any one of claims 1 to 7. A booklet comprising the information recording body according to any one of claims 1 to 7.

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