WO2018163228A1 - Method for assessing authenticity of printed matter and method for preventing counterfeiting of printed matter - Google Patents

Abstract

The present invention pertains to a method for assessing the authenticity of printed matter and a method for preventing counterfeiting of printed matter. Printed matter (12) has a specific region (14) in which is printed a substance (26) that emits infrared rays (24) upon being irradiated with ultraviolet rays (16). This method has: a first step for irradiating the specific region (14) with ultraviolet rays (16); a second step for detecting infrared rays (24) that are emitted from the specific region (14) in accordance with the irradiation by the ultraviolet rays (16), and reading the shape of the specific region (14) or the intensity of the infrared rays (24); and a third step for determining the authenticity of the printed matter (12) on the basis of the result of the reading.

Description

Method for determining authenticity of printed matter and method for preventing forgery of printed matter

The present invention relates to a printed matter authenticity determination method and a printed matter forgery prevention method.

Recently, passwords and personal symbols and marks have been printed with fluorescent ink that is difficult to see under normal visible light for personal authentication and confidentiality of documents ( (For example, see Japanese Patent No. 4185032, Japanese Patent Laid-Open No. 9-188835, and Japanese Patent Laid-Open No. 8-239611).

Further, for example, JP-A-2002-086889 discloses a forgery-preventing printed matter, and JP-A-2011-001409 discloses a pigment suitable for security printing for preventing forgery.

In the techniques described in Japanese Patent No. 4185032, Japanese Patent Laid-Open No. 9-188835, and Japanese Patent Laid-Open No. 8-239611, all of the conventional fluorescent inks are colorless in the visible light region and difficult to see with the naked eye. However, by irradiating the ultraviolet excitation light with an ultraviolet lamp or the like, the fluorescent ink emits fluorescence in the visible light region, so that visual recognition with the naked eye becomes easy.

Recently, it is easy to obtain such fluorescent inks and ultraviolet lamps. For this reason, there is a risk that forgery in which a password printed on a document with fluorescent ink is previously confirmed with an ultraviolet lamp and printed on another document with the same fluorescent ink may be facilitated.

On the other hand, Japanese Patent Application Laid-Open Nos. 2002-086889 and 2011-001409 describe phosphors for ultraviolet excitation and infrared light emission, and the wavelengths of excitation light and detection light are separated from each other. It is disclosed that a filter that cuts interference is unnecessary. However, the light emission performance (quantum efficiency, etc.) of the actual phosphor is not shown, and the possibility is shown, and it is far from practical use. In addition, there is no specific disclosure about an actual authenticity determination method using such a material.

The present invention has been made in consideration of such problems. Although the authenticity of a printed matter is simple, the confidentiality of the printed matter is high and a large amount of inspection can be performed in a short time. An object is to provide a forgery determination method and a forgery prevention method for printed matter.

[1] The first aspect of the present invention is a method for determining the authenticity of a printed material, wherein the printed material has a specific region on which a substance that emits infrared light by irradiating ultraviolet rays is printed, The second step of detecting the infrared rays emitted from the specific region with the irradiation of the ultraviolet rays and reading the shape of the specific region or the intensity of the infrared rays, And a third step of determining the authenticity of the printed matter based on the third step.

By adopting the method for determining the authenticity of a printed material according to the present embodiment, the authenticity of the printed material can be determined accurately and easily and inexpensively, and the printed material can be prevented from being counterfeited. That is, it contributes to a method for preventing forgery of printed matter.

[2] In the first aspect of the present invention, the second step of reading the shape of the specific region or the intensity of the infrared is to capture an image of the specific region with an infrared detection device that detects the infrared, The third step of determining authenticity of the printed matter may be authenticating the image.

By adopting such a method, an image that cannot be recognized by normal visual inspection and is difficult to forge can be used as a criterion for authenticity determination, high-precision authenticity judgment can be performed, and forgery of printed matter can be prevented. Useful.

[3] In the first aspect of the present invention, the specific area is imaged by a camera having sensitivity in a visible light area, and the authentication is preset with the image captured by the camera under the irradiation of the ultraviolet rays. It may be determined that the authentication is negative when the authentication image matches.

By adopting such a method, even if the image is forged, if the forged printing fluorescent ink is forged, the image is detected by a camera having sensitivity in the visible light region. For this reason, it can be determined to be counterfeit in the authentication step.

[4] In the first aspect of the present invention, the authentication is determined as positive authentication when an image captured by the infrared detection device matches a preset authentication image under the irradiation of the ultraviolet rays. May be.

By adopting such a method, it is more difficult to forge the authentication image and the fluorescent ink, and it is possible to prevent the forgery of the printed matter and the authenticity judgment with high authenticity determination accuracy and security level.

[5] In the first aspect of the present invention, the ultraviolet ray is an ultraviolet ray on which a specific primary signal is superimposed, and a secondary signal superimposed on the infrared ray radiated from the specific region with the irradiation of the ultraviolet ray is obtained. The authenticity of the printed matter may be determined by reading and based on the secondary signal.

By adopting such a method, the authenticity determination can be simplified and higher accuracy can be realized. Usually, a specific pattern and figure are printed with a wavelength conversion material (ultraviolet excitation, infrared emission phosphor), and a highly accurate determination is obtained by a method of recognizing such a shape. In this case, there is a problem that a complicated processing circuit and apparatus for recognizing a figure, a shape, and the like are necessary and become large-scale.

Also, there is a problem in that it takes time and accuracy when printing on the phosphor, so that the shape does not collapse. It is possible to make a judgment based on the presence / absence of an application area that may be in any shape instead of a pattern. In such a case, similar phosphors (including phosphors with low emission efficiency) were applied. However, since it emits light slightly, accurate determination cannot be made.

Therefore, through the above-described method, the authenticity of the printed matter can be easily determined simply by confirming the synchronization and matching of the irradiation signal (primary signal) and the detection signal (secondary signal). In addition, there is no need to depend on printing patterns and graphics, and labor can be reduced.

[6] In the first aspect of the present invention, the specific region of the printed matter is a phosphor that is excited by the excitation light including the ultraviolet rays and emits light including the near infrared rays, and has an internal quantum efficiency of 10 % May be a region which is printed with an ink containing a phosphor having a pigment content of at least% as a pigment and is colorless under visible light.

By adopting such a method, the authentication of images, the reading of secondary signals superimposed on infrared rays, the authenticity of printed matter based on the secondary signals, etc. can be made with a higher accuracy and simpler device. It becomes possible.

[7] In the first aspect of the invention, the ultraviolet rays applied to the specific region are ultraviolet rays including a predetermined level, and the predetermined level is the ink containing the phosphor having an internal quantum efficiency of 10% or more as a pigment. Is used, the infrared rays emitted from the specific region as a result of the irradiation of the ultraviolet rays are infrared rays of a detectable level, and the phosphor contains an internal quantum efficiency of less than 10% as a pigment. When using the infrared ray, the infrared ray emitted from the specific region with the irradiation of the ultraviolet ray may be an undetectable infrared ray.

This makes it possible to operate at a high security level that cannot be imitated by a third party by making the predetermined level known only to the parties.

[8] In the first aspect of the present invention, in the first step of irradiating the specific region with the ultraviolet light, the surface on which the specific region is set is irradiated with the ultraviolet light, and accompanied with the irradiation of the ultraviolet light. The second step of detecting the infrared ray radiated from the specific region and reading the shape of the specific region or the intensity of the infrared ray may detect the infrared ray emitted from the surface on which the specific region is set. Good.

By adopting such a method, the ultraviolet irradiation device and the infrared detection device can be installed adjacent to or at the same position, and the entire device can be realized in a compact manner. In addition, there is a merit that alignment between the irradiation position and the detection position becomes easy.

[9] In the first aspect of the present invention, in the first step of irradiating the specific region with the ultraviolet light, the surface on which the specific region is set is irradiated with the ultraviolet light, and accompanied with the irradiation of the ultraviolet light. The second step of detecting the infrared ray emitted from the specific region and reading the shape of the specific region or the intensity of the infrared ray detects the infrared ray emitted from a surface where the specific region is not set. Also good.

This is an authentication image and signal detection method that takes advantage of the phosphor that emits infrared rays when excited by ultraviolet rays. Ultraviolet rays with short wavelengths are difficult to transmit through objects such as printed matter, and infrared rays with long wavelengths are Utilizes the property of being easily transmitted through an object. By adopting such a method, the ultraviolet irradiation device and the infrared detection device can be arranged on a straight line, and the arrangement of the entire device can be simplified. In addition, since it is easy to continuously pass inspection objects through irradiation and detection lines arranged on a straight line, a large amount of inspection objects can be processed in a short time. Furthermore, since the irradiated ultraviolet rays do not enter the infrared detection device at the time of detection, detection noise can be eliminated and detection with high accuracy is possible.

[10] In the first aspect of the present invention, the first step may irradiate the ultraviolet rays using an ultraviolet irradiation device, and the second step may detect the infrared rays using an infrared detection device. .

[11] In the first aspect of the present invention, the ultraviolet irradiation device may be a device that emits long-wavelength ultraviolet light.

[12] In the first aspect of the present invention, the detection element used in the infrared detection device may be a solid-state imaging element.

[13] In the first aspect of the present invention, the infrared detecting device may be a device that visualizes near infrared rays using a photomultiplier tube.

[14] In the first aspect of the present invention, the infrared detecting device may be a card coated with a paint that receives infrared light and emits visible light.

[15] In the first aspect of the present invention, a distance between the printed matter and the infrared detection device may be larger than a maximum length that defines the specific area.

[16] In the first aspect of the present invention, the substance that emits infrared rays when irradiated with ultraviolet rays may include a phosphor having a perovskite structure represented by BaSnO ₃ as a main component.

By adopting such an inorganic material, it has the characteristics that durability can be maintained and infrared emission performance can be maintained for a long period of time even in an environment of ultraviolet irradiation.

[17] In the method for preventing forgery of a printed material according to the second aspect of the present invention, the printed material has a specific region printed with a substance that emits infrared rays by irradiating ultraviolet rays, and the specific region is irradiated with the ultraviolet rays. Based on the result of the first step, the second step of detecting the infrared ray emitted from the specific region with the irradiation of the ultraviolet ray, and reading the shape of the specific region or the intensity of the infrared ray And a third step of determining the authenticity of the printed matter.

The printed material authenticity determination method and the printed material forgery prevention method according to the present invention have at least the following effects.
(A) It is easy on the side to be inspected (used), and it is possible to perform the authenticity determination and inspection with high confidentiality that is unknown to the side not knowing how to use.
(B) A large amount of inspection is possible in a short time.
(C) A large-scale device is not required.
(D) Inspection on site such as an airport becomes easy.
(E) The security level is high.

FIG. 1A shows an example of a first authenticity determination method, and is an explanatory diagram showing a state in which a specific area printed on a printed matter is picked up with a normal camera under ultraviolet light, and FIG. 1B is under ultraviolet light. It is explanatory drawing which shows the state which is imaging the specific area | region printed on printed matter with the infrared rays detection apparatus. FIG. 2 is an explanatory diagram showing an example of the crystal structure of the phosphor particles contained in the ink used in the present embodiment. FIG. 3 is an explanatory diagram showing the authentication process for samples 1 to 4. FIG. 4 is a flowchart showing an example of the authentication operation in the first authenticity determination method. FIG. 5A shows an example of a second authenticity determination method, and is an explanatory view showing a state where an image printed with a specific ink is captured under ultraviolet light, and FIG. 5B shows another ink under ultraviolet light. It is explanatory drawing which shows the state which has imaged the image printed by. FIG. 6 is a flowchart showing an example of the authentication operation in the second authenticity determination method. FIG. 7 is a configuration diagram illustrating an example of a third authenticity determination device used in the third authenticity determination method. FIG. 8 is a flowchart showing an example of the third authenticity determination method. FIG. 9A is an explanatory diagram illustrating an example of an ultraviolet irradiation device, and FIG. 9B is an explanatory diagram illustrating another example of the ultraviolet irradiation device. FIG. 10A is a diagram illustrating signal waveforms of a primary signal, an optical signal, and a secondary signal when printed with a specific ink, and FIG. 10B is a diagram illustrating a primary signal, an optical signal, and a secondary signal when printed with other ink. It is a figure which shows the signal waveform of a signal. FIG. 11 is an explanatory diagram showing a configuration of an ultraviolet irradiation apparatus having a plurality of semiconductor lasers. FIG. 12 is an explanatory diagram illustrating an example of a determination method in the signal determination apparatus. FIG. 13 is a diagram illustrating a first configuration example in the case of determining the authenticity of a plurality of printed materials. FIG. 14 is a diagram illustrating a second configuration example in the case of determining the authenticity of a plurality of printed materials. FIG. 15 is a diagram illustrating a third configuration example when determining the authenticity of a plurality of printed materials. FIG. 16 is a diagram illustrating a fourth configuration example (No. 1) in the case of determining the authenticity of a plurality of printed materials. FIG. 17 is a diagram illustrating a fourth configuration example (No. 2) in the case of determining the authenticity of a plurality of printed materials.

Hereinafter, embodiments of a printed material authenticity determination method and a printed material forgery prevention method according to the present invention will be described with reference to FIGS. 1A to 17. In the present specification, “˜” indicating a numerical range is used as a meaning including numerical values described before and after the numerical value as a lower limit value and an upper limit value.

First, a device according to a first specific example (hereinafter referred to as a first authenticity determination device 10A) used in a printed material authenticity determination method (hereinafter referred to as a first authenticity determination method) according to the first embodiment. Will be described with reference to FIGS. 1A to 4.

As shown in FIGS. 1A and 1B, the first authenticity determination device 10A is sensitive to an ultraviolet irradiation device 18 such as an ultraviolet lamp that irradiates the specific region 14 of the printed matter 12 with an ultraviolet ray 16 and mainly in the visible light region. It has a normal camera 19 (see FIG. 1A), an infrared detection device 20 (see FIG. 1B) such as an infrared camera having sensitivity in the infrared light region, and an authentication device 22.

A substance that emits infrared rays 24 when irradiated with ultraviolet rays 16 is printed on the specific region 14 of the printed matter 12. For example, an image for authentication is printed with specific ink 26. Images include numbers, letters, pictures, marks, barcodes, two-dimensional codes, and the like. Here, the specific area 14 refers to an area set in advance for determining the authenticity of the printed material 12, and is set to either the front surface or the back surface of the printed material 12. Therefore, for example, if the specific area 14 is set on the surface of the printed material 12, the surface of the printed material 12 is the surface on which the specific area 14 is set, and the back surface of the printed material 12 is the surface on which the specific region 14 is not set. It is.

In FIG. 1A and FIG. 1B, the image is shown with a thickness that allows the image with the ink 26 to be visually recognized. However, the image cannot actually be visually recognized under visible light. That is, the specific region 14 of the printed matter 12 is a colorless region under visible light.

The above-described ink 26 is excited by excitation light including ultraviolet rays 16, emits light including near infrared rays, and contains a phosphor having an internal quantum efficiency of 10% or more as a pigment.

The phosphor is preferably an inorganic oxide having a perovskite structure. Examples of the phosphor include a phosphor having a perovskite structure represented by BaSnO ₃ . As shown in FIG. 2, this phosphor has a perovskite-type crystal structure, Ba (barium) is arranged at each vertex, Sn (tin) is arranged at the body center, and Sn is the center. O (oxygen) is arranged in the face center. Because it is an inorganic material that does not contain carbon, it has excellent durability against long-term use of the printed matter 12 and irradiation of ultraviolet rays 16 and the like. Can be maintained. Further, the fine particles are white, and even if mixed with the ink or the like, it does not affect the color development of the ink, which is preferable.

The composition of the phosphor can be measured by an energy dispersive X-ray analyzer. The crystal structure can be measured by a powder X-ray diffractometer (XRD).

The method for producing the phosphor includes a step of reacting these raw materials using raw materials containing Ba and Sn. In the step of reacting the raw materials, for example, a hydrothermal synthesis method, a supercritical hydrothermal synthesis method, or the like can be preferably employed. However, the raw materials may be synthesized by firing in the air.

Then, the ultraviolet irradiation device 18 irradiates the specific region 14 of the printed matter 12 with the ultraviolet rays 16. The normal camera 19 images a portion of the printed matter 12 that is irradiated with the ultraviolet rays 16. The normal camera 19 and the infrared detection device 20 image a portion of the printed matter 12 that is irradiated with the ultraviolet rays 16.

The authentication device 22 determines negative authentication, that is, incorrect when a normal image captured by a normal camera 19 matches a preset authentication image (authentication image) under ultraviolet light. .

The authentication device 22 determines negative authentication when the infrared image captured by the infrared detection device 20 does not match a preset authentication image under ultraviolet light.

Further, the authentication device 22 does not match the normal image captured by the normal camera 19 with the preset authentication image under the ultraviolet light, and the infrared detection device 20 captures the image under the ultraviolet light. When the set infrared image matches the preset authentication image, it is determined for the first time that the authentication is positive, that is, correct.

Here, the first authenticity determination method will be described with reference to FIGS. As an example, the difference in authentication between samples 1 to 4 will also be described.

Sample 1 printed the same image as the authentication image with specific ink 26 on a specific region 14 (for example, the upper surface) of printed matter 12 as shown in FIG. In sample 2, an image different from the authentication image was printed with a specific ink 26 in a specific area 14 of the printed matter 12. Sample 3 was printed with the same image as the authentication image with the other ink 27 that emits fluorescence in the visible light region by the ultraviolet irradiation device 18. Sample 4 did not print an image on the specific area 14 of the printed material 12. In FIG. 3, in order to show that the images printed on samples 1 to 3 cannot be viewed under visible light, the images are shown by broken lines.

First, in step S1 of FIG. 4, the ultraviolet irradiation device 18 irradiates the specific region 14 of the printed matter 12 with ultraviolet rays 16 by manual operation by an operator or automatic control by a computer.

In step S2, the normal camera 19 images a portion of the printed matter 12 irradiated with the ultraviolet rays 16 by manual operation by an operator or automatic control by a computer. That is, a normal image is acquired.

In step S3, the authentication device 22 compares the normal image captured by the normal camera 19 with a preset authentication image. If the normal image matches the authentication image, negative authentication is performed in step S4. Then, the subsequent authentication process is terminated.

Here, in both samples 1 and 2, an image is printed on the specific region 14 of the printed matter 12 with the specific ink 26. However, since the fluorescent ink emits infrared light under the irradiation of the ultraviolet rays 16, the normal camera 19 having sensitivity in the visible light region cannot capture an image of the specific ink 26.

Therefore, in Samples 1 and 2, the normal image captured by the normal camera 19 does not match the preset authentication image. In addition, since an image is not originally printed in the specific area 14 for the sample 4, the normal image captured by the normal camera 19 and the authentication image set in advance also do not match in this case.

Since the sample 3 has the same image as the authentication image printed with the other ink 27 that emits fluorescence in the visible light region by the ultraviolet irradiation device 18, that is, the ink 27 that is not the specific ink 26, The captured normal image matches the preset authentication image. That is, sample 3 is determined as negative authentication.

On the other hand, if it is determined in step S3 described above that the normal image and the authentication image do not match, the process proceeds to the next step S5. In step S5, instead of the normal camera 19, the infrared detection device 20 images a portion of the printed matter 12 that is irradiated with the ultraviolet rays 16 by manual operation by an operator or automatic control by a computer. That is, an infrared image is acquired.

In the next step S6, the authentication device 22 compares the infrared image captured by the infrared detection device 20 with a preset authentication image. If the infrared image matches the authentication image, the authentication device 22 determines in step S7. Authenticate positively. On the other hand, if the infrared image does not match the authentication image, negative authentication is performed in step S4.

Here, since the samples 1 and 2 have an image printed on the specific region 14 with the specific ink 26 as described above, the specific ink 26 emits infrared light under ultraviolet light. As a result, as shown in FIG. 3, the samples 1 and 2 each capture an image of the specific ink 26 by the infrared detection device 20. Since sample 1 prints an image that matches the authentication image, it is determined as positive authentication, and since sample 2 prints an image that does not match the authentication image, it is determined as negative authentication. Note that sample 4 is not originally printed in the specific area 14 and thus does not match the preset authentication image, resulting in negative authentication.

As described above, among samples 1 to 4, only sample 1 printed with the above-described specific ink 26 and an image that matches the authentication image is positively authenticated, and the other is negatively authenticated, which is effective in preventing forgery. I understand.

That is, conventionally, when the normal image captured by the normal camera 19 under the ultraviolet light matches the authentication image, the authentication is determined as positive authentication. However, in the first authenticity determination method, the normal image is determined in step S3. If the authentication image matches the authentication image, negative authentication is determined. Therefore, even if an image that matches the authentication image is printed using ink 27 other than the specific ink 26, it is processed as a forged printed matter or the like. As a result, it is possible to prevent forgery in which a password or the like printed on a document or the like with a fluorescent ink is previously confirmed with an ultraviolet lamp, and another document is printed with the same fluorescent ink. Even if the image is forged, if the forged printing fluorescent ink is forged, the image is detected by the camera 19 having sensitivity in the visible light region, so that the authentication step (step S3 ) Can be determined to be counterfeit.

Furthermore, in this embodiment, it is determined that the authentication is positive only when the infrared image captured by the infrared detection device 20 matches the authentication image under ultraviolet light. Therefore, even if conventional fluorescent ink is used, it is impossible to obtain a positive authentication. A positive authentication can be obtained only by using a specific ink 26 and printing an image that matches the authentication image. Since it is not visible light emission by ultraviolet irradiation, it cannot be confirmed by visual observation, and using a special device called the infrared detection device 20 and authenticating with image information shared between parties prevents prevention of counterfeiting of printed matter, etc. And improve the security level.

Next, a device according to a second specific example (hereinafter referred to as a second authenticity determination device) used in a printed material authenticity determination method (hereinafter referred to as a second authenticity determination method) according to the second embodiment. 10B) will be described with reference to FIGS. 5A to 6. FIG.

As shown in FIGS. 5A to 6, the second authenticity determination device 10B includes the ultraviolet irradiation device 18, the infrared detection device 20, and the authentication device 22 in the same manner as the first authenticity determination device 10A described above. The difference is that the intensity of the ultraviolet rays 16 emitted from the irradiation device 18 is set as follows.

That is, as shown in FIG. 5A, when the specific region 14 of the printed matter 12 is printed with a specific ink 26 containing a specific phosphor having an internal quantum efficiency of 10% or more as a pigment, the infrared detection device 20 It sets so that the intensity | strength I of the read infrared rays 24 may become more than the preset threshold value Ith. In other words, as shown in FIG. 5B, the intensity I of the infrared rays 24 read by the infrared detecting device 20 when the phosphor 27 having an internal quantum efficiency of less than 10% is printed as the pigment 27 is threshold. Set to be less than the value Ith.

Here, the second authenticity determination method will be described with reference to the flowchart of FIG.

First, in step S101 of FIG. 6, the ultraviolet irradiation device 18 irradiates the specific region 14 of the printed matter 12 with ultraviolet rays 16 by manual operation by an operator or automatic control by a computer.

In step S102, the infrared detecting device 20 detects the infrared rays 24 from the specific area 14. Next, in step S103, the authentication device 22 performs affirmative authentication in step S104 when the intensity I of the infrared ray 24 detected by the infrared detection device 20 is greater than or equal to the threshold value Ith. On the other hand, if the intensity of infrared rays is less than the threshold value Ith, negative authentication is performed in step S105.

In this second authenticity determination method, as described above, the relationship between the internal quantum efficiency of the phosphor and the intensity of the infrared ray 24 emitted from the specific region 14 is grasped, and the intensity of the infrared ray 24 to be positively authenticated in advance. By setting (threshold value Ith), the authenticity determination can be simplified and the accuracy can be improved. Further, in order to determine the intensity of infrared light emitted by such ultraviolet irradiation based on the threshold value Ith, the internal quantum efficiency of the phosphor to be used is slightly varied depending on the intensity of the ultraviolet light 16 to be irradiated. Is preferably 10% or more. If it is less than 10%, the intensity of the emitted infrared rays 24 is insufficient, and detection with a simple device becomes unstable.

Next, an apparatus according to a third specific example (hereinafter referred to as a third authenticity determination device) used in a printed matter authenticity determination method (hereinafter referred to as a third authenticity determination method) according to the third embodiment. 10C) will be described with reference to FIGS.

As illustrated in FIG. 7, the third authenticity determination device 10 </ b> C irradiates ultraviolet rays 16 in which a specific primary signal Sa <b> 1 is superimposed (modulated with a specific primary signal Sa <b> 1) on a specific region 14 of the printed matter 12. The device 18, the infrared ray 24 emitted from the specific area 14, the infrared detection device 20 that reads (extracts) the secondary signal Sa <b> 2 superimposed on the infrared ray 24, and the printed matter based on at least the read secondary signal Sa <b> 2. And a signal determination device 30 for determining true / false of twelve.

The specific area 14 of the printed matter 12 is printed with specific ink 26. The ink 26 is a phosphor that is excited by excitation light including ultraviolet rays 16 and emits light including near infrared rays, and includes a phosphor having an internal quantum efficiency of 10% or more as a pigment. Therefore, the specific region 14 of the printed matter 12 is a colorless region under visible light. Of course, if an image or the like is printed on the base of the ink 26, the image is visually recognized through the ink 26. In addition, the external shape of the specific area | region 14 is arbitrary and can employ | adopt square, circular, an ellipse, a polygon, etc.

Further, the distance between the printed matter 12 and the infrared detection device 20 may be larger than the maximum length that defines the specific region 14. Since the reach distance of the infrared ray 24 is longer than that of the ultraviolet ray 16, the degree of freedom of the installation position of the infrared ray detection device 20 can be increased accordingly, and it is possible to flexibly cope with various device configurations.

Here, the third authenticity determination method will be described with reference to the flowchart of FIG.

First, in step S201 of FIG. 8, the ultraviolet irradiation device 18 irradiates the specific region 14 of the printed matter 12 with the ultraviolet light 16 on which the specific primary signal Sa1 is superimposed (modulated with the specific primary signal Sa1). In step S <b> 202, the infrared detection device 20 detects the infrared ray 24 emitted from the specific area 14. In step S203, the infrared detector 20 reads the secondary signal Sa2 superimposed on the detected infrared ray 24. In step S204, the signal determination device 30 determines the authenticity of the printed matter 12 based on the read secondary signal Sa2.

Examples of the primary signal Sa1 include an ON / OFF pattern signal, a signal that modulates the phase of the ultraviolet ray 16, a signal that modulates the amplitude of the ultraviolet ray 16, and a signal that modulates the polarization plane of the ultraviolet ray 16. Of course, the ultraviolet light 16 may be modulated with the primary signal Sa1 using a modulation method used in normal optical communication. Examples of normal optical communication include time division multiplexing, optical wavelength multiplexing, multilevel modulation, and polarization multiplexing. Examples of the ON / OFF pattern signal include a high level / low level pattern signal.

Further, as the ultraviolet irradiation device 18, for example, a direct modulation method in which a semiconductor laser that emits ultraviolet rays 16 is directly turned on / off with a primary signal Sa 1, or an ultraviolet light emitted from the semiconductor laser is used as a primary modulator. An external modulation system that changes the phase, amplitude, polarization plane, and the like according to the signal Sa1 can be employed.

For example, as shown in FIG. 9A, a pattern signal Sp that changes to ON and OFF with respect to time is directly input to the semiconductor laser 32 as the primary signal Sa1. As a result, the semiconductor laser 32 outputs an optical signal Lp (ultraviolet ray 16) that blinks in accordance with ON / OFF of the pattern signal Sp.

Alternatively, as shown in FIG. 9B, an optical modulator 34 is arranged on the output side of the semiconductor laser 32, and a pattern signal Sp that changes temporally ON and OFF is input to the optical modulator 34 as the primary signal Sa1. . For example, a reference signal Sb that is always ON is input to the semiconductor laser 32, and ultraviolet rays 16 are emitted from the semiconductor laser 32. As a result, the light modulator 34 outputs an optical signal Lp (ultraviolet light 16) in which the emitted light (ultraviolet light 16) from the semiconductor laser 32 blinks according to ON / OFF of the pattern signal Sp.

That is, the ultraviolet ray 16 modulated by the pattern signal Sp including the high level and the low level is emitted from the ultraviolet ray irradiation device 18. By irradiating the specific region 14 with the ultraviolet rays 16, the infrared rays 24 having the intensity corresponding to the high level and the low level are emitted. As a result, the infrared detection device 20 outputs a pattern signal (secondary signal Sa2: see FIG. 7) that changes to ON / OFF in time corresponding to the high level / low level.

In this case, as shown in FIG. 10A, a medium level signal obtained by reducing the ON level (high level) may be included as the pattern signal Sp as the primary signal Sa1. That is, the level relationship is high level> medium level> low level. When the maximum level of the pattern signal Sp is 100, for example, the high level is 80 to 100, the medium level is 40 to 60, the low level is 0 to 20, and the like.

As a result, as shown in FIG. 7, the ultraviolet light irradiation device 18 emits an optical signal Lp (ultraviolet light 16) modulated by the pattern signal Sp including high level, medium level and low level. By irradiating the specific region 14 with the ultraviolet rays 16, the infrared rays 24 having the intensity corresponding to the high level, the medium level, and the low level are emitted. As a result, the infrared detection device 20 outputs a pattern signal (secondary signal Sa2) that changes to ON / OFF in time corresponding to the high level / low level and the medium level / low level.

As shown in FIG. 10A, when the medium level is printed with the ink 26 containing the specific phosphor having an internal quantum efficiency of 10% or more as the pigment in the specific region 14 of the printed matter 12, the infrared detection device 20 The level that is output as ON, that is, is set so as to be high when read as the secondary signal Sa2. In other words, as shown in FIG. 10B, the level output as OFF from the infrared detecting device 20 when the phosphor having an internal quantum efficiency of less than 10% is printed as the pigment, that is, the secondary signal. It is set so that it is at a low level when it is read as Sa2. This makes it possible to increase the concealment of the primary signal Sa1 despite the simple signal form of ON / OFF.

That is, as described above, the primary signal Sa1 is added to temporal ON / OFF, and the signal intensity is set as a pattern. For example, a signal pattern is set so that a low intensity signal cannot be detected according to the internal quantum efficiency of the phosphor contained in the ink. And, since only the parties can know the characteristics of the printed matter, the primary signal pattern, and the resulting secondary signal pattern, it is possible to operate with a high security level that cannot be imitated by a third party. It becomes possible.

When three or more levels are employed, such as a high level, a medium level, and a low level, at least the primary signal Sa1 is not an ON / OFF pattern signal, but a shade corresponding to the level as a signal component. It may be a gray signal.

As a modification of the ultraviolet irradiation device 18, for example, as shown in FIG. 11, two semiconductor lasers (first semiconductor laser 32A and second semiconductor laser 32B) may be used. In this case, for example, the first pattern signal Sp1 and the second pattern signal Sp2 by ON / OFF are directly input to the first semiconductor laser 32A and the second semiconductor laser 32B, respectively. The first semiconductor laser 32A outputs a first optical signal Lp1 (ultraviolet ray 16) that blinks in response to ON / OFF of the first pattern signal Sp1, and the second semiconductor laser 32B turns ON / OFF the second pattern signal Sp2. The second optical signal Lp2 (ultraviolet ray 16) that blinks in response to is output. Of course, three or more semiconductor lasers may be used.

Further, as the ultraviolet irradiation device 18, a device that emits ultraviolet light having a short wavelength that cannot be visually recognized may be used. For example, a black light that emits ultraviolet light having a long wavelength of 315 to 400 nm may be used. Good.

On the other hand, the infrared detection device 20 may be configured by an infrared light receiving element that receives an optical signal of the infrared light 24 from the specific region 14 of the printed matter 12. Alternatively, an infrared camera using a solid-state imaging device such as a CCD or CMOS as a detection element, a battery-driven infrared viewer that visualizes near infrared rays using a photomultiplier tube, and the like can be given. Of course, the infrared detection device 20 is a combination of an infrared viewer card coated with a paint that receives infrared light 24 and emits visible light, and a camera (CCD camera, CMOS camera, etc.) that detects visible light from the infrared viewer card. May be used.

When the signal determination device 30 uses, for example, one semiconductor laser 32 (see FIG. 9) as the ultraviolet irradiation device 18, and uses, for example, one infrared light receiving element as the infrared detection device 20, as shown in FIG. , ON periods T1, T2, T3... Of the primary signal Sa1 (pattern signal Sp) to the semiconductor laser 32 or the optical modulator 34 (see FIG. 9), and the secondary signal Sa2 detected by the infrared light receiving element. For example, when the ON periods Ta, Tb, Tc,... Are the same, it is determined that the printed matter 12 is correct.

The signal determination device 30 may determine the authenticity of the printed matter by comparing the image data from the infrared camera with the pattern signal. In particular, when an infrared camera, an infrared viewer, or the like is used as the infrared detection device 20, the present invention can also be applied when the ultraviolet irradiation device 18 includes a plurality of semiconductor lasers (see FIG. 11). In other words, when multiple semiconductor lasers are used, by supplying different pattern signals to each semiconductor laser, it is possible to identify complex optical signals (ultraviolet rays) whose ON / OFF timing differs spatially and temporally. The region 14 can be irradiated. In this case, as described above, by using an infrared camera, an infrared viewer, or the like as the infrared detection device 20, the ON cycle at a plurality of spatially separated locations from sequentially captured image data in units of frames. Can be captured. As a result, the signal determination device 30 can easily determine the authenticity of the printed matter 12 by comparing ON cycles at a plurality of locations with a plurality of pattern signals by the same method as described above.

Of course, it may be determined as follows. Changes in captured images (reference moving images) due to ultraviolet irradiation from a plurality of semiconductor lasers on a correct printed matter 12 and a plurality of preset reference pattern signals are recorded in a memory. In the actual determination on the printed matter 12 whose authenticity is unknown, the authenticity of the printed matter 12 may be determined by comparing the moving image captured by the infrared camera or the infrared viewer with the reference moving image. Good.

Next, a configuration example and a determination method when determining the authenticity of a plurality of printed materials 12 in the third authenticity determination method will be described with reference to FIGS.

In the first configuration example, as shown in FIG. 13, for example, a third authenticity determination device 10 </ b> C is installed in association with a first sheet counting device 40 </ b> A that counts the number of bundled printed materials 12.

The first number counting device 40A includes, for example, an accommodating portion 42 that accommodates a plurality of printed materials 12, an urging means 44 that presses the plurality of printed materials 12 upward, and only the uppermost printed material 12 of the plurality of printed materials 12. It has a roller 46 that pulls out in one direction and a pair of rollers 48 that convey the drawn printed matter 12 in one direction. Of course, the first sheet counting device 40A is not limited to the above-described configuration.

The third authenticity determination device 10 </ b> C is installed above the printed material 12 in the conveyance process by a pair of rollers 48, for example.

The ultraviolet irradiation device 18 of the third authenticity determination device 10C always irradiates the ultraviolet rays 16 in an oblique direction toward the surface of the printed matter 12 in the conveyance process. The ultraviolet ray 16 is modulated by the primary signal Sa1. If the specific ink 26 is printed on the specific region 14 on the surface of the printed matter 12, the specific region 14 irradiated with the ultraviolet ray 16 is irradiated when the irradiation position of the ultraviolet ray 16 coincides with the specific region 14 of the printed matter 12. Infrared rays 24 are emitted. The infrared ray 24 enters the infrared detection device 20. The infrared detection device 20 reads the secondary signal Sa2 superimposed on the detected infrared ray 24 and outputs it to the signal determination device 30.

The signal determination device 30 determines the authenticity of the printed matter 12 based on the input secondary signal Sa2. In this case, it is preferable to include a synchronization signal indicating the start of determination in the primary signal Sa1. Thereby, the authenticity determination in the signal determination apparatus 30 can be performed with high accuracy.

In addition, since the ultraviolet ray 16 is irradiated on the surface on which the specific region 14 is set and the infrared ray 24 emitted from the surface on which the specific region 14 is set is detected, the ultraviolet irradiation device 18 and the infrared detection device 20 are provided. It can be installed adjacent to or at the same position, and the entire apparatus can be realized in a compact manner. In addition, there is a merit that alignment between the irradiation position and the detection position becomes easy.

In addition, when the specific ink 26 is not printed in the specific area 14 of the printed matter 12, the infrared ray 24 is not radiated from the specific area 14, or the overall level is low even if the infrared ray 24 is radiated. 30 cannot distinguish ON / OFF. In such a case, the signal determination device 30 determines that the printed matter 12 is “false”. The same applies to second to fourth configuration examples described later.

In the above-described example, the ultraviolet rays 16 are constantly irradiated. However, the ultraviolet rays 16 may be irradiated when the specific area 14 of the printed matter 12 reaches a preset position. In this case, it is not necessary to include a synchronization signal indicating the start of determination in the primary signal Sa1.

Next, as shown in FIG. 14, the second configuration example has substantially the same configuration as the first configuration example described above, but for example, a pair of rollers 48 irradiates ultraviolet rays above the printed matter 12 in the process of conveyance. The difference is that an apparatus 18 is installed and an infrared detection apparatus 20 is installed below the printed material 12 in the process of conveyance.

The ultraviolet irradiation device 18 always irradiates the ultraviolet rays 16 toward the surface (for example, the surface) on which the specific region 14 of the printed matter 12 in the conveyance process is set. If the specific ink 26 is printed on the specific region 14 on the surface of the printed matter 12, the specific region 14 irradiated with the ultraviolet ray 16 is irradiated when the irradiation position of the ultraviolet ray 16 coincides with the specific region 14 of the printed matter 12. Infrared rays 24 are emitted. In this case, since the infrared ray 24 passes through the printed matter 12 and is emitted from the back surface of the printed matter 12, the secondary signal Sa2 superimposed on the infrared ray 24 is read by the infrared detecting device 20 as described above. The signal determination device 30 determines the authenticity of the printed matter 12 based on the input secondary signal Sa2.

This is an authentication image and signal detection method that takes advantage of the feature of a phosphor that emits infrared rays 24 when excited by the ultraviolet rays 16. The ultraviolet rays 16 having a short wavelength are difficult to transmit through an object such as a printed matter 12 and have a long wavelength. Reference numeral 24 uses the property of easily passing through such an object.

By adopting such a method, that is, the ultraviolet ray 16 is irradiated to the surface where the specific region 14 is set, and the infrared ray 24 emitted from the surface where the specific region 14 is not set is detected. The ultraviolet irradiating device 18 and the infrared detecting device 20 can be arranged on a straight line, so that the arrangement of the entire device can be simplified. Moreover, since it is easy to continuously pass the inspection object (printed matter 12) through the irradiation and detection lines arranged on a straight line, a large amount of inspection objects can be processed in a short time. Furthermore, since the irradiated ultraviolet rays 16 do not enter the infrared detecting device 20 at the time of detection, detection noise can be eliminated and highly accurate detection is possible.

As shown in FIG. 15, in the third configuration example, a third authenticity determination device 10C is installed in association with a second number counting device 40B different from the first number counting device 40A.

Although details of the second number counting device 40B are omitted, one short side of the bundled printed matter 12 is opened, and the printed matter 12 is counted one by one from the uncounted bundle into a container (not shown) that has been counted. Move. The number of sheets is counted in the process of moving the printed matter 12 one by one.

The ultraviolet irradiation device 18 of the third authenticity determination device 10C is installed to face the surface of the printed matter 12 when the moving printed matter 12 reaches the center position. In particular, the ultraviolet light emitting surface is installed so as to face the specific area 14 on the surface of the printed matter 12. The infrared detection device 20 is disposed at a position facing the ultraviolet irradiation device 18 and facing the back surface of the printed matter 12 when the moving printed matter 12 reaches the center position.

And the ultraviolet irradiation device 18 always irradiates the ultraviolet rays 16 toward the printed matter 12 in the middle of movement. If the specific ink 26 is printed on the specific region 14 on the surface of the printed matter 12, the specific region 14 irradiated with the ultraviolet ray 16 is irradiated when the irradiation position of the ultraviolet ray 16 coincides with the specific region 14 of the printed matter 12. Infrared rays 24 are emitted. In this case, since the infrared ray 24 passes through the printed matter 12 and is emitted from the back surface of the printed matter 12, the secondary signal Sa2 superimposed on the infrared ray 24 is read by the infrared detecting device 20 as described above. The signal determination device 30 determines the authenticity of the printed matter 12 based on the input secondary signal Sa2.

Also in this case, similarly to the above-described second configuration example, the ultraviolet irradiation device 18 and the infrared detection device 20 can be arranged on a straight line, and there is an advantage that the arrangement of the entire device can be simplified. Moreover, since it is easy to continuously pass the inspection object (printed matter 12) through the irradiation and detection lines arranged on a straight line, a large amount of inspection objects can be processed in a short time. Furthermore, since the irradiated ultraviolet rays 16 do not enter the infrared detecting device 20 at the time of detection, detection noise can be eliminated and highly accurate detection is possible.

As shown in FIGS. 16 and 17, the fourth configuration example has substantially the same configuration as the third configuration example described above, but differs in the following points. That is, the ultraviolet irradiation device 18 and the infrared detection device 20 are installed at positions facing the surface side of the printed matter 12. For example, in the configuration example shown in FIG. 16, the ultraviolet irradiation device 18 can irradiate the surface 16 of the printed material 12 when the moving printed material 12 reaches the center position, in particular, the specific region 14 with the ultraviolet light 16. Is installed. The infrared detecting device 20 is installed at a position where the infrared ray 24 from the specific region 14 irradiated with the ultraviolet ray 16 can be received.

In the configuration example shown in FIG. 17, the ultraviolet irradiation device 18 irradiates, for example, the ultraviolet rays 16 on the surface of the uppermost printed matter 12 (printed matter 12 to be counted) of the uncounted bundle, particularly on the specific region 14. It is installed at a position where it can be irradiated. The infrared detecting device 20 is installed at a position where the infrared ray 24 from the specific region 14 irradiated with the ultraviolet ray 16 can be received.

Also in the fourth configuration example shown in FIGS. 16 and 17, the specific ink 26 is printed on the specific region 14 on the surface of the printed matter 12. In the fourth configuration example, similarly to the first configuration example described above, the surface 16 on which the specific region 14 is set is irradiated with the ultraviolet rays 16 and the infrared ray 24 emitted from the surface on which the specific region 14 is set is emitted. Since the detection is performed, the ultraviolet irradiation device 18 and the infrared detection device 20 can be installed adjacent to or at the same position, and the entire device can be realized in a compact manner. In addition, there is a merit that alignment between the irradiation position and the detection position becomes easy. In particular, in the configuration example shown in FIG. 17, it is possible to remove the printed matter 12 determined as “false” before counting.

As described above, the third authenticity determination method includes a first step of irradiating the specific region 14 of the printed matter 12 with the ultraviolet ray 16 on which the specific primary signal Sa1 is superimposed (modulated with the specific primary signal Sa1), and the ultraviolet ray 16. The second step of detecting the infrared signal 24 radiated from the specific region 14 with the irradiation of the laser beam and reading the secondary signal Sa2 superimposed on the detected infrared signal 24, and the printed material 12 based on the read secondary signal Sa2 And a third step for determining authenticity.

By adopting such a method, it is possible to simplify and improve the accuracy of authenticity determination. Usually, a specific pattern and figure are printed with a wavelength conversion material (ultraviolet excitation, infrared emission phosphor), and a highly accurate determination is obtained by a method of recognizing such a shape. In this case, there is a problem that a complicated processing circuit and apparatus for recognizing a figure, a shape, and the like are necessary and become large-scale. In addition, there is a problem in that it takes time and accuracy when printing on a phosphor, so that the shape does not lose its shape. It is possible to make a judgment based on the presence / absence of an application area that may be in any shape instead of a pattern. In such a case, similar phosphors (including phosphors with low emission efficiency) were applied. However, since it emits light slightly, accurate determination cannot be made.

Therefore, through the first to third steps described above, the authenticity of the printed matter 12 can be easily confirmed simply by confirming the synchronization and matching of the irradiation signal (primary signal Sa1) and the detection signal (secondary signal Sa2). Judgment is possible. In addition, there is no need to depend on printing patterns and graphics, and labor can be reduced.

In the above-described third authenticity determination method, an example in which the third authenticity determination device 10C is used has been described. However, instead of the third authenticity determination device 10C, the first authenticity determination device 10A and the second authenticity determination device described above are used. The false determination device 10B can be used.

That is, the authenticity determination method in the case of determining the authenticity of the plurality of printed materials 12 shown in FIGS. 13 to 17 irradiates the ultraviolet rays 16 on which the specific primary signal Sa1 is superimposed and superimposes them on the infrared rays 24. The threshold value is not limited to the third authenticity determination method of reading the secondary signal Sa2, but the first authenticity determination method for authenticating the image in the image of the specific area 14 or the intensity of the infrared ray 24 that emits light. The second true / false determination method that is determined based on the above is also employed as appropriate.

Therefore, by adopting the printed material authenticity determination method according to the present embodiment, the authenticity of the printed material can be determined easily and inexpensively, and the printed material can be prevented from being counterfeited. That is, it contributes to a method for preventing forgery of printed matter.

It should be noted that the printed matter authenticity determination method and the printed matter forgery prevention method according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention. .

Claims (17)

1. A method for determining the authenticity of a printed material (12),
   The printed matter (12) has a specific region (14) on which a substance (26) that emits infrared rays (24) by being irradiated with ultraviolet rays (16) is printed.
   A first step of irradiating the specific region (14) with the ultraviolet light (16);
   The infrared ray (24) emitted from the specific region (14) with the irradiation of the ultraviolet ray (16) is detected, and the shape of the specific region (14) or the intensity of the infrared ray (24) is read. Steps,
   And a third step of determining the authenticity of the printed matter (12) based on the read result.
2. In the authenticity determination method of the printed matter (12) according to claim 1,
   In the second step of reading the shape of the specific area (14) or the intensity of the infrared ray (24), an image of the specific area (14) is captured by an infrared detection device (20) that detects the infrared ray (24). Is to do
   The method of determining authenticity of a printed matter (12), wherein the third step of determining authenticity of the printed matter (12) authenticates the image.
3. In the printed matter (12) authenticity determination method according to claim 2,
   The specific area (14) is imaged by a camera (19) having sensitivity in the visible light area,
   The authentication is characterized in that negative authentication is determined when the image captured by the camera (19) matches a preset authentication image under irradiation of the ultraviolet rays (16). The authenticity determination method of the printed matter (12) to be performed.
4. In the authenticity determination method of the printed matter (12) according to claim 2 or 3,
   The authentication is determined as affirmative authentication when an image captured by the infrared detection device (20) matches a preset authentication image under irradiation of the ultraviolet rays (16). The authenticity determination method of printed matter (12).
5. In the authenticity determination method of the printed matter (12) according to claim 1,
   The ultraviolet ray (16) is an ultraviolet ray on which a specific primary signal (Sa1) is superimposed,
   A secondary signal (Sa2) superimposed on the infrared ray (24) radiated from the specific region (14) with the irradiation of the ultraviolet ray (16) is read, and the printed matter is based on the secondary signal (Sa2). A method for determining the authenticity of a printed matter (12), wherein the authenticity of (12) is determined.
6. The method for determining the authenticity of a printed matter (12) according to any one of claims 1 to 5,
   The specific region (14) of the printed matter (12) is a phosphor that is excited by excitation light including the ultraviolet rays (16) and emits light including near infrared rays, and has an internal quantum efficiency of 10%. A method for determining the authenticity of a printed matter (12), characterized in that the printed matter (12) is an area that is printed with an ink (26) containing the phosphor as a pigment and is colorless under visible light.
7. In the printed matter (12) authenticity determination method according to claim 6,
   The ultraviolet ray (16) applied to the specific region (14) is an ultraviolet ray including a predetermined level,
   The predetermined level is emitted from the specific region (14) with the irradiation of the ultraviolet ray (16) when the ink (26) containing the phosphor having an internal quantum efficiency of 10% or more as a pigment is used. When the ink containing the phosphor having a detectable level of infrared rays (24) and having an internal quantum efficiency of less than 10% is used as a pigment, the irradiation with the ultraviolet rays (16) is accompanied. The method of determining authenticity of a printed matter (12), wherein the infrared ray (24) emitted from the specific region (14) is an undetectable level infrared ray.
8. The method of determining authenticity of a printed matter (12) according to any one of claims 1 to 7,
   In the first step of irradiating the specific region (14) with the ultraviolet ray (16), the surface on which the specific region (14) is set is irradiated with the ultraviolet ray (16),
   The infrared ray (24) emitted from the specific region (14) with the irradiation of the ultraviolet ray (16) is detected, and the shape of the specific region (14) or the intensity of the infrared ray (24) is read. 2 step detects the said infrared rays (24) emitted from the surface in which the said specific area | region (14) was set, The authenticity determination method of printed matter (12) characterized by the above-mentioned.
9. The method of determining authenticity of a printed matter (12) according to any one of claims 1 to 7,
   In the first step of irradiating the specific region (14) with the ultraviolet ray (16), the surface on which the specific region (14) is set is irradiated with the ultraviolet ray (16),
   The infrared ray (24) emitted from the specific region (14) with the irradiation of the ultraviolet ray (16) is detected, and the shape of the specific region (14) or the intensity of the infrared ray (24) is read. In step 2, the authenticity determination method for the printed matter (12), wherein the infrared ray (24) emitted from a surface on which the specific area (14) is not set is detected.
10. The method for determining authenticity of a printed matter (12) according to any one of claims 1 to 9,
    The first step irradiates the ultraviolet rays (16) using an ultraviolet irradiation device (18),
    The method of determining authenticity of a printed matter (12), wherein the second step detects the infrared ray (24) using an infrared detecting device (20).
11. The method of determining authenticity of a printed matter (12) according to claim 10,
    The method of determining authenticity of a printed matter (12), wherein the ultraviolet irradiation device (18) is a device that emits ultraviolet light having a long wavelength.
12. The method of determining authenticity of a printed matter (12) according to claim 10 or 11,
    A method for determining the authenticity of a printed matter (12), wherein the detection element used in the infrared detection device (20) is a solid-state image sensor.
13. The method of determining authenticity of a printed matter (12) according to claim 10 or 11,
    The method of determining authenticity of a printed matter (12), wherein the infrared detection device (20) is a device that visualizes near infrared rays using a photomultiplier tube.
14. The method of determining authenticity of a printed matter (12) according to claim 10 or 11,
    The method for determining the authenticity of a printed matter (12), wherein the infrared detection device (20) is a card applied with a paint that receives the infrared ray (24) and emits visible light.
15. The method for determining the authenticity of a printed matter (12) according to any one of claims 10 to 14,
    The method of determining authenticity of a printed matter (12), wherein a distance between the printed matter (12) and the infrared detection device (20) is greater than a maximum length that defines the specific area (14).
16. The printed matter (12) authenticity determination method according to any one of claims 1 to 15,
    The substance that emits the infrared rays (24) by irradiating the ultraviolet rays (16) contains a phosphor having a perovskite structure represented by BaSnO ₃ as a main component. False judgment method.
17. A method for preventing forgery of printed matter (12),
    The printed matter (12) has a specific region (14) printed with a substance that emits infrared rays (24) when irradiated with ultraviolet rays (16).
    A first step of irradiating the specific region (14) with the ultraviolet light (16);
    The infrared ray (24) emitted from the specific region (14) with the irradiation of the ultraviolet ray (16) is detected, and the shape of the specific region (14) or the intensity of the infrared ray (24) is read. Steps,
    And a third step of determining the authenticity of the printed matter (12) based on the read result. A method for preventing forgery of the printed matter (12).

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