JP2007196608A - Article provided with information recording medium and reading apparatus for the information recording medium - Google Patents

Abstract

The present invention is not affected by an article provided with an information recording medium in which an information recording medium having confidential information that cannot be recognized by the naked eye is placed on a printed matter, and the color or pattern of the printed matter of the article. It is another object of the present invention to provide a reading apparatus in which the presence / absence of secret information on an information recording medium and information reproduction (reading) of the secret information are reliably performed.
A diffraction grating element group having secret information that cannot be visually recognized is formed on a surface of a substrate, the diffraction grating element group having a diffraction grating in which a grating interval and a grating angle are set. In an article having an information recording medium in which an information recording medium on which predetermined confidential information can be read and detected by reproduction information of the diffraction grating from the diffraction grating element group is arranged on the surface of the printed matter, at least a part of an image constituting the printed matter Is formed of an ink that absorbs ultraviolet light or infrared light.
[Selection] Figure 2

Description

  The present invention relates to an article provided with an information recording medium in which an information recording medium having confidential information that cannot be recognized by the naked eye is placed on a printed matter, and the information recording without being affected by the color or pattern of the printed matter of the article. The present invention relates to a reading apparatus in which the presence / absence of confidential information on a medium and information reproduction (reading) of the confidential information are reliably performed.

As a method of determining the authenticity of an information recording medium having a diffraction grating using a verification machine, information is coded and recorded by a combination of fine diffraction grating patterns formed by a diffraction grating having a specific grating direction and spatial frequency. A method of obtaining a diffracted light by irradiating a pattern information portion with a laser beam or the like and reading it with a sensor is known.
In addition, a barcode formed by the presence or absence of a diffractive structure such as a diffraction grating is recorded so that diffracted light is generated in a light receiver installed at a predetermined position with respect to incident light, and scanned with laser light or the like. A method of receiving a diffraction image, capturing an output waveform, recognizing a code, and determining authenticity is also known.

However, since the information recording medium having the diffraction grating obtained as described above records information in a specific area, it is easy to find an area where information is recorded with an observation device such as a magnifying glass. If the angle at which the laser beam is irradiated is known, it is possible to create a counterfeit product based on the information.
In order to solve such a problem, an authentication code formed by a unit image of a diffractive structure formed with a size that cannot be visually recognized is recorded, and a reading device using a laser beam or the like is used. A method of reading the information and determining the authenticity has been proposed. (See Patent Document 1)
However, when authenticity is determined by such a method, when the diffraction grating pattern of the information recording medium to be determined is formed on an object on which a color or pattern is arranged, laser light is used. Depending on the combination of the background color and pattern of the base material portion onto which the diffraction grating pattern is transferred, it becomes difficult to read information clearly.
JP 2003-215319 A

  The present invention has been made in consideration of the above technical background, and an article including an information recording medium in which an information recording medium having confidential information that cannot be recognized with the naked eye is placed on a printed material, and It is an object of the present invention to provide a reading apparatus capable of reliably performing the presence / absence of confidential information on an information recording medium and information reproduction (reading) of the confidential information without being affected by the color or pattern of the printed matter of the article.

In order to achieve the above object, that is, the invention according to claim 1 is a secret that cannot be visually recognized by a plurality of minute diffraction gratings having a grating interval and a grating angle set on the substrate surface. An information recording medium in which a diffraction grating element group having information is formed, and an information recording medium on which a predetermined secret information can be read and detected by reproduction information of the diffraction grating from the diffraction grating element group is arranged on the surface of the printed matter In an article having
An article provided with an information recording medium, wherein at least a part of an image constituting the printed matter is formed of an ink that absorbs ultraviolet light or infrared light.

  The invention according to claim 2 is an article provided with the information recording medium according to claim 1, further comprising an absorption layer that absorbs ultraviolet light or infrared light on the back surface of the information recording medium. .

  According to a third aspect of the present invention, there is provided the information recording medium according to the first aspect, further comprising an adhesive layer that absorbs ultraviolet light or infrared light between the information recording medium and the printed matter. It is an article.

  The invention according to claim 4 is the article provided with the information recording medium according to claim 1, wherein the substrate of the printed matter absorbs ultraviolet light or infrared light.

  The invention according to claim 5 is the information recording medium according to any one of claims 1 to 4, wherein the image constituting the printed material is a pattern, a character, a picture, a photograph, or the like. It is an article provided with.

The invention according to claim 6 is a reading device for reading the confidential information of the information recording medium having the confidential information in the article having the information recording medium according to any one of claims 1 to 5. ,
A light source that emits ultraviolet or infrared light; and
Secret information reading means for reading secret information detected by a combination of diffracted light based on illumination light from the light source to the diffraction grating element group,
An information recording medium reader comprising at least determination means for determining authenticity based on information from the confidential information reading means. According to the invention described in claim 6, by using a light source that emits ultraviolet light or infrared light as the illumination light source, the color of the article in which a plurality of minute diffraction grating elements are arranged can be any color. Even if a fine pattern is arranged on the article to which the diffraction grating element group is transferred, it is possible to read the secret information that appears without being affected by the fine pattern.

  A seventh aspect of the present invention is the information recording medium reading device according to the sixth aspect, comprising a plurality of the light sources. According to the invention described in claim 7, a specific diffraction grating element among the plurality of diffraction grating elements reproduces a part of the confidential information by irradiating the diffraction grating element with light from a specific light source. The other diffraction grating element reproduces a part of the confidential information by irradiating light from a light source arranged in a direction different from the specific light source to the diffraction grating element. Accordingly, since the light source required for reproducing the secret information differs, the forgery thereof becomes more difficult.

  According to the present invention, by illuminating with an article provided with an information recording medium in which confidential information that cannot be recognized by the naked eye is placed on a printed material and a light source that emits ultraviolet light or infrared light, Therefore, it is possible to provide a reading apparatus in which the presence / absence of confidential information on the information recording medium to be determined and the information reproduction (reading) of the confidential information are reliably performed without being influenced by the color or pattern of the printed matter of the article. .

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 1 to 6 are schematic cross-sectional views of an article provided with an information recording medium as an embodiment of the present invention. FIG. 7 is a schematic perspective view showing an example of the information recording medium in the present invention. FIG. 8 is an explanatory diagram showing an example of a secret information reading method according to the present invention. FIG. 9 is an explanatory diagram showing another example of the secret information reading method according to the present invention. FIG. 10 is an explanatory diagram showing still another example of the secret information reading method according to the present invention.

  As shown in FIG. 1, the article provided with the information recording medium of the present invention is composed of an information recording medium that holds confidential information. The material constituting the information recording medium has a high transmittance for visible light, ultraviolet light, and infrared light. The information recording medium 12 illuminates the authenticity of the substrate 11 of the printed material with the confidential information that is held. When the printed material base 11 is banknotes, securities, or various certificates, the authenticity of the printed material base 11 itself can be proved by the presence of confidential information, and otherwise it can be determined to be counterfeit. Moreover, when the base material 11 of printed matter is a packaging material, the authenticity of the content packaged with this base material (packaging material) 11 can be discriminated.

  This confidential information cannot be read with the naked eye but can be read using a specific detection device, and the article 1 provided with the information recording medium has the following form.

  That is, the information recording medium 12 includes at least a light reflection layer 124. As will be described later, the light reflecting layer 124 has a concavo-convex shape, and the concavo-convex forms a reflective diffraction grating, and the direction of the reflected diffracted light is all or part of the secret information. The article having the information recording medium shown in FIG. 1 includes an adhesive layer 125 that adheres the light reflecting layer 124 to the substrate 11 of the printed matter. Thus, the substrate 11 of the printed matter and the light reflecting layer 124 are provided. Other layers may be interposed between the two. In FIG. 1, reference numeral 123 denotes a protective layer that protects the light reflecting layer 124 from scratches and dirt.

  2-6 shows the form of the articles | goods provided with the information recording medium as one Example of this invention. In the figure, reference numeral 13 denotes a coating portion of ink having absorbability for ultraviolet light or infrared light. FIG. 3 shows the configuration of the information recording medium in the present invention. Reference numeral 14 denotes an ultraviolet light or infrared light absorbing layer, and this absorbing layer is connected to the information recording medium via the adhesive layer 15. Bonded to the back. FIG. 4 shows the information recording medium shown in FIG. 3 placed on a printed material base 11. In FIG. 5, an adhesive layer 125 of the information recording medium is used that absorbs ultraviolet light or infrared light, and is adhered to the substrate 11 of the printed matter. In FIG. 6, the substrate 11 itself of the printed material has an ultraviolet light or infrared light absorbability.

  As shown in the perspective view of FIG. 7, the surface of the information recording medium 12 is divided into a large number of regions, and diffraction grating elements 12a, 12b,. The diffraction grating elements 12a, 12b,... Are composed of the diffraction gratings, and at least some of the diffraction grating elements 12a, 12b,. Holding a part. The other diffraction grating elements 12x, 12y,... Are dummy and do not hold confidential information. The dummy diffraction grating elements 12x, 12y,... Are mixed to conceal the presence and position of the diffraction grating element 12a that holds confidential information. In addition, when each of these many diffraction grating elements 12a, 12b,... Including the dummy diffraction grating elements 12x, 12y,... It is possible to display a beautiful visible image that changes, and to conceal confidential information in this beautiful visible image, and to make it more difficult to find its presence and position. Moreover, by including colors and patterns in the printed material base 11 on the back surface of the information recording medium 12, confidential information can be camouflaged, and a further security effect can be provided.

A method for reading confidential information will be described with reference to the drawings. The diffraction grating element 12a holding confidential information can be irradiated with irradiation light from a specific light source 2, and the direction of reflected diffracted light generated in response to this can be detected to read the presence and content of the confidential information. . As the light source 2, it is necessary to use a surface light source having a wavelength region in the ultraviolet. The reflected diffracted light can be detected by, for example, arranging an ultraviolet sensor at a predetermined position (see FIG. 8). It is also possible to place a projection screen 3 that emits fluorescence at a predetermined position, emit the diffracted light onto the screen, and photograph the presence or absence of the light spot thus obtained with a camera or the like. It is also possible to focus the reflected diffracted light on an image on a projection screen that emits fluorescence and capture the obtained image to read confidential information.

  It is also possible to provide a plurality of diffraction grating elements 12a, 12b,... That hold a part of the confidential information, and to configure all of the confidential information by the reflected diffraction light of the plurality of diffraction grating elements 12a, 12b,. Is possible. In this case, the secret information can be detected by emitting the reflected diffracted light of the plurality of diffraction grating elements 12a, 12b,... On the image plane of the ultraviolet camera installed in advance. In addition, a projection screen that emits fluorescence is installed at a position corresponding to the image plane of the camera, and reflected diffracted light is emitted on the projection screen, and the presence or absence of the light spot thus obtained is photographed with a camera or the like to detect confidential information. It is also possible to do. In FIG. 9, four diffraction grating elements 12a, 12b, 12c, and 12d are used as diffraction grating elements that hold a part of confidential information, and are emitted in response to irradiation light from the same surface light source 2. It is explanatory drawing which shows the method of irradiating the projection screen 3 of 4 reflected diffracted lights and photographing this light spot with the camera 4 etc. FIG. In the figure, reference numeral 5 denotes a determination means such as a CPU.

  Further, the secret information can be reproduced by irradiating each of the plurality of diffraction grating elements 12a, 12b,... With reading light from surface light sources arranged in different directions. That is, among the plurality of diffraction grating elements, some of the diffraction grating elements 12a and 12b are irradiated with light from a specific light source 21 to reproduce a part of the secret information, and are transmitted to the other diffraction grating elements 12c and 12d. On the other hand, light is irradiated from an ultraviolet light source 22 arranged in a direction different from the specific light source 21 to reproduce a part of the confidential information. FIG. 10 is an explanatory diagram showing this state. The diffraction grating elements 12a and 12b are irradiated with reading light from the light source 21, while the diffraction grating elements 12c and 12d are irradiated with reading light from the light source 22 to reflect and diffract. It is generating light. The reflected diffracted light from the diffraction grating elements 12 a, 12 b, 12 c, and 12 d is irradiated on the projection screen 3 that emits fluorescence, and is photographed by the camera 4 through the lens 6. In the figure, reference numerals 71 and 72 denote switching means for switching between the light sources 21 and 22.

1 is a schematic cross-sectional view of an article provided with an information recording medium as one embodiment of the present invention. 1 is a schematic cross-sectional view of an article provided with an information recording medium as one embodiment of the present invention. It is a schematic cross section which shows an example of the information recording medium in this invention. 1 is a schematic cross-sectional view of an article provided with an information recording medium as one embodiment of the present invention. 1 is a schematic cross-sectional view of an article provided with an information recording medium as one embodiment of the present invention. 1 is a schematic cross-sectional view of an article provided with an information recording medium as one embodiment of the present invention. It is a model perspective view which shows an example in the article | item provided with the information recording medium as one Example of this invention. It is explanatory drawing which shows an example of the reading method of the confidential information in this invention. It is explanatory drawing which shows the other example of the reading method of the confidential information in this invention. It is explanatory drawing which shows another example of the reading method of the confidential information in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Article 11 provided with information recording medium 11 Printed substrate 12 Information recording medium 124 Light reflecting layers 12a, 12b, 12c, 12d Diffraction grating elements 12x, 12y holding confidential information Dummy diffraction grating elements 2, 21, 22... Light source having wavelength region in ultraviolet 3. Image plane of ultraviolet compatible camera 4. Ultraviolet compatible camera 6. Lens 7.

Claims (7)

A diffraction grating element group having secret information that cannot be visually recognized is formed on a substrate surface having a plurality of diffraction gratings each having a diffraction grating in which a grating interval and a grating angle are set. The diffraction grating element group In an article having an information recording medium in which an information recording medium capable of reading and detecting predetermined secret information from the reproduction information of the diffraction grating is arranged on the surface of the printed matter,
An article provided with an information recording medium, wherein at least a part of an image constituting the printed matter is formed of an ink that absorbs ultraviolet light or infrared light.   The article provided with the information recording medium according to claim 1, further comprising an absorption layer that absorbs ultraviolet light or infrared light on a back surface of the information recording medium.   The article provided with the information recording medium according to claim 1, further comprising an adhesive layer that absorbs ultraviolet light or infrared light between the information recording medium and the printed matter.   The article provided with the information recording medium according to claim 1, wherein the substrate of the printed matter absorbs ultraviolet light or infrared light.   The article comprising the information recording medium according to any one of claims 1 to 4, wherein an image constituting the printed matter is a pattern, a character, a pattern, a photograph, or the like. A reading device for reading confidential information of an information recording medium provided with confidential information in an article having the information recording medium according to any one of claims 1 to 5,
A light source that emits ultraviolet or infrared light; and
Secret information reading means for reading secret information detected by a combination of diffracted light based on illumination light from the light source to the diffraction grating element group,
An apparatus for reading an information recording medium, comprising: at least determination means for determining authenticity based on information from the confidential information reading means.   7. The information recording medium reading device according to claim 6, comprising a plurality of the light sources.

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