JP2014141296A - Storage body, laminate, and authenticity determination method for storage body and laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage body capable of confirming safely a concealed image which cannot be confirmed by infrared ray.SOLUTION: A storage body 100 comprises: a storage main body 10 made of paper or opaque resin and storing an object to be stored; and an image 20 including a conductor and disposed on other than an outer surface 10x of the storage main body 10. The storage main body 10 reflects or absorbs infrared ray, and penetrates electromagnetic wave in a range of 0.1 THz-3 THz of frequency.

Description

  The present invention relates to a container and a laminate having a concealed image. The present invention also relates to a method for determining the authenticity of the container and a method for determining the authenticity of the laminate.

There is known a technique for concealing an image so that it is not visually recognized by the naked eye in a medium that requires anti-counterfeiting or authenticity determination, and reading the concealed image by irradiating infrared rays (for example, Patent Documents) 1 and 2).
In such a medium, it is necessary to conceal the image with a material that transmits infrared rays.

JP 2001-96889 A Registered Utility Model No. 3013328

  However, since infrared rays do not pass through thick paper or resin such as corrugated cardboard, when an image is provided inside an envelope or the like made of thick paper or resin, the image cannot be read using infrared rays. In particular, many cardboards have voids inside, and infrared rays are scattered in these voids, so that images cannot be read by transmitting infrared rays.

  In order to read an image concealed with thick paper or resin, it may be possible to use radiation such as X-rays. However, as the apparatus becomes large-scale, measures against exposure are necessary.

  Therefore, an object of the present invention is to provide a container, a laminate, a method for determining authenticity of a container, and a method for determining authenticity of a laminate that can safely check a concealed image that cannot be confirmed by infrared rays.

The container according to the present invention comprises:
A container body that is made of paper or opaque resin and that accommodates an object to be accommodated;
An image including a conductor provided on the outer surface of the container body, and
With
The container body reflects or absorbs infrared rays and transmits electromagnetic waves in a frequency range of 0.1 THz to 3 THz.

In the above container,
The container body is
The first layer;
A second layer stacked on the first layer,
The image may be provided between the first layer and the second layer.

In the above container,
The image may be provided on an inner surface of the container body.

In the above container,
The container body has an envelope shape, and has an envelope portion and a flap portion provided in the envelope portion,
The image may be provided at a position covered by the flap portion when the flap portion is folded and bonded to the envelope portion.

In the above container,
The container body may be formed of one or a plurality of plain papers as the paper, cardboard as the paper, or polystyrene foam as the resin. When the container body is formed of the plain paper, the thickness of the container body is preferably in the range of 100 μm to 1 cm. When the container body is formed of the corrugated cardboard, the thickness of the container body is preferably in the range of 3 mm to 3 cm. When the container body is formed of the polystyrene foam, the thickness of the container body is preferably in the range of 50 mm to 200 cm.

In the above container,
The conductor may be carbon black or metal.

In the above container,
The image may be a barcode.

The laminate according to the present invention comprises:
A first layer formed of paper or opaque resin;
A second layer laminated to the first layer, formed of paper or opaque resin;
An image including a conductor provided between the first layer and the second layer;
With
The first layer and the second layer reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz.

A method for determining authenticity of a container according to the present invention includes: a container body that is made of paper or an opaque resin and that houses an object to be stored; and an image including a conductor provided on a surface other than the outer surface of the container body. The container body reflects or absorbs infrared rays and transmits electromagnetic waves in a frequency range of 0.1 THz to 3 THz, and a method for determining the authenticity of the container,
Irradiating the container with electromagnetic waves in a frequency range of 0.1 THz to 3 THz;
Obtaining a transmission image by the electromagnetic wave transmitted through the container, or a reflection image by the electromagnetic wave reflected from the container;
Determining authenticity of the container based on the transmission image or the reflection image;
Is provided.

The method for determining the authenticity of a laminate according to the present invention includes a first layer formed of paper or opaque resin, a second layer stacked on the first layer formed of paper or opaque resin, An image including a conductor provided between the first layer and the second layer, wherein the first layer and the second layer reflect or absorb infrared rays and have a wavelength of 0.1 THz to 3 THz. A method for determining the authenticity of a laminate that transmits electromagnetic waves in a frequency range,
Irradiating the laminate with an electromagnetic wave having a frequency range of 0.1 THz to 3 THz;
Obtaining a transmission image by the electromagnetic wave transmitted through the laminate, or a reflection image by the electromagnetic wave reflected from the laminate;
Determining authenticity of the laminate based on the transmission image or the reflection image;
Is provided.

  In the method for determining the authenticity of a container or a laminate according to the present invention, the electromagnetic wave having the frequency range of 0.1 THz to 3 THz is generated using a nonlinear optical effect generated by irradiating a nonlinear optical crystal with laser light. An electromagnetic wave may be used.

  The present invention is an image acquisition device that acquires an image provided on a container body that includes a container body that is made of paper or an opaque resin and that houses a container object. The container body is provided on the outer surface, and the container body is configured to reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz. A light irradiation unit that irradiates the container with electromagnetic waves in a frequency range of 3 THz, and an image acquisition unit that acquires a transmission image of the electromagnetic waves transmitted through the container, or a reflection image of the electromagnetic waves reflected from the container. And an image acquisition device. The image acquisition device may acquire an image based on an electromagnetic wave transmitted through a gap between images, or may acquire an image based on an electromagnetic wave reflected by the image.

  The present invention is provided in a laminate including a first layer formed of paper or opaque resin, and a second layer stacked on the first layer formed of paper or opaque resin. An image acquisition device for acquiring an image, wherein the image is provided between the first layer and the second layer, and the first layer and the second layer reflect or absorb infrared rays. The image acquisition device is configured to transmit an electromagnetic wave having a frequency range of 0.1 THz to 3 THz, and a light irradiation unit that irradiates the laminate with an electromagnetic wave having a frequency range of 0.1 THz to 3 THz; It is an image acquisition apparatus provided with the image acquisition part which acquires the transmission image by the said electromagnetic wave which permeate | transmitted the said laminated body, or the reflected image by the said electromagnetic wave reflected from the said laminated body. The image acquisition device may acquire an image based on an electromagnetic wave transmitted through a gap between images, or may acquire an image based on an electromagnetic wave reflected by the image.

  In the image acquisition device according to the present invention, an electromagnetic wave generated using a nonlinear optical effect generated by irradiating a nonlinear optical crystal with laser light is used as the electromagnetic wave in the frequency range of 0.1 THz to 3 THz. Also good.

  According to the present invention, an image including a conductor is provided on a surface other than the outer surface of the container body, and the container body reflects or absorbs infrared rays and transmits electromagnetic waves in a frequency range of 0.1 THz to 3 THz. Therefore, by irradiating the electromagnetic wave, the electromagnetic wave is reflected by the conductor included in the image. Therefore, based on the obtained reflected image or transmitted image, a hidden image that cannot be confirmed by infrared rays can be safely confirmed. it can.

It is a top view which shows the structure of the container which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the AA cross section of the container of FIG. It is a figure explaining the preparation methods of the container of FIG. It is a figure which shows schematic structure of the transmission image acquisition apparatus which concerns on 1st Embodiment. It is a figure which shows the permeation | transmission image acquired from the container of FIG. It is a flowchart explaining the authenticity determination method of the container of FIG. It is a figure which shows schematic structure of the reflected image acquisition apparatus which concerns on 2nd Embodiment. It is sectional drawing of the container which concerns on 3rd Embodiment. It is a top view which shows the structure of the laminated body which concerns on 4th Embodiment. It is sectional drawing which shows the structure of the BB cross section of the laminated body of FIG. It is a flowchart explaining the authenticity determination method of the laminated body of FIG. It is a figure for demonstrating the evaluation method in Example 1. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

(First embodiment)
FIG. 1 is a plan view showing a configuration of a container 100 according to the first embodiment. FIG. 2 is a cross-sectional view showing the configuration of the AA cross section of the container 100 of FIG.

  As shown in FIG. 1, the container 100 includes a container main body 10 that stores an object to be stored, and an image 20.

  The container body 10 is made of paper. In the present embodiment, the container body 10 is formed of cardboard as paper, and the container 100 is referred to as a cardboard envelope. That is, the container body 10 has an envelope shape, and includes an envelope portion 11 and a flap portion (gluing margin) 12 provided at an opening of the envelope portion 11. The flap part 12 is folded back 180 ° and adhered to the adhesive region 11a of the envelope part 11, whereby the container 100, which is a cardboard envelope, is sealed. FIG. 1 shows the container 100 before the flap 12 is folded back.

  As shown in FIG. 2, the container body 10 includes a first layer 13 that is a cardboard, and a second layer 14 and a third layer 15 that are stacked on the first layer 13. Of the two surfaces facing outward of the first layer 13 formed in an envelope shape, the second layer 14 is laminated and bonded to one surface, and the third layer 15 is laminated to the other surface. It is glued.

  The container body 10 is configured to reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz (hereinafter referred to as terahertz waves). In this specification, “reflect or absorb infrared rays” means that when the container body 10 is irradiated with infrared rays, the infrared rays are not transmitted through the container body 10 at all, and the infrared rays are transmitted through the container body 10. Even so, it means that the amount of transmitted infrared light is so small that the transmitted infrared light cannot be detected by the sensor.

  The image 20 is provided other than the outer surface 10 x of the container body 10. In this example, the image 20 represents the characters “DNP”. The outer surface 10x is a surface that faces the outer side of the container body 10 when the container body 10 is sealed, that is, a surface that can be visually recognized by the naked eye. In the present embodiment, the image 20 is provided between the first layer 13 and the second layer 14. Therefore, the image 20 cannot be visually recognized when the container 100 is visually recognized from the outside. In particular, even if the inner surface of the envelope part 11 is visually recognized from the opening of the envelope part 11 before the container 100 is sealed, the image 20 cannot be visually recognized. That is, the image 20 is hidden.

  Further, the image 20 is provided at a position where the flap portion 12 is covered by the flap portion 12 when the flap portion 12 is folded back 180 ° and adhered to the envelope portion 11 and sealed. Thereby, even when the thickness of the second layer 14 is thin, after the container 100 is sealed, the image 20 can be more reliably prevented from being visually recognized. However, the image 20 may be provided at another position when the thickness of the second layer 14 is thick, and may be provided at the position where there is a position covered with a member other than the flap portion 12. .

  The image 20 is formed by printing ink on the first layer 13. As will be described later, the ink includes a conductor that reflects terahertz waves, for example, a granular conductor. In this embodiment, the conductor is carbon black.

  Next, a method for manufacturing the container 100 will be described. FIG. 3 is a diagram illustrating a method for manufacturing the container 100 of FIG.

  First, as shown in FIG. 3A, an image 20 is printed on the first layer 13 which is a corrugated cardboard cut into a predetermined shape using an ink containing carbon black. As such an ink, a known ink may be used. Further, the composition of each component in the ink is not particularly limited, and an optimum composition is set according to the printing method, the material of the first layer 13, the characteristics required for the container 100, and the like. Also, the printing method is not particularly limited, and an inkjet method, a screen printing method, a gravure printing method, or the like can be appropriately used.

  Next, as shown in FIG. 3B, the second layer 14 is laminated on the first layer 13 so as to cover the image 20, and the first layer 13 and the second layer 14 are bonded. In addition, the third layer 15 is laminated on the first layer 13 with a predetermined interval from the second layer 14, and the first layer 13 and the third layer 15 are bonded. Thereby, a corrugated cardboard envelope paper is created.

Next, as shown in FIG. 3C, the corrugated envelope paper of FIG. 3B is folded back 180 ° at the portion of the first layer 13 where the second layer 14 and the third layer 15 are not laminated. At this time, two sides other than the folded side and the side that becomes the sealing port in the envelope portion 11 are appropriately bonded to create the container 100 that is a cardboard envelope. Note that an adhesive flap portion may be provided on each of the two sides to be bonded, and the flap portion may be folded back by 180 ° for bonding. In this case, the image 20 may be provided at a position covered by the flap portion.
Then, the sending object (accommodating object) is accommodated in the container 100 and sealed.

Then, the authenticity determination method of such a container 100 using the transmission image acquisition apparatus 1 is demonstrated.
FIG. 4 is a diagram illustrating a schematic configuration of the transmission image acquiring apparatus 1 according to the first embodiment. As illustrated in FIG. 4, the transmission image acquisition device 1 includes a light source 200, a mirror 300, and an image acquisition unit 400.

  The light source 200 irradiates the container 100 via the mirror 300 with a terahertz wave having a frequency range of 0.1 THz to 3 THz. Thus, in the present embodiment, the light source 200 and the mirror 300 constitute the light irradiation unit 150 that irradiates the container 100 with the terahertz wave in the frequency range of 0.1 THz to 3 THz. The terahertz wave has a beam diameter that irradiates a part of the container 100. The frequency range of the terahertz wave is more preferably 1 THz to 2 THz because the container body 10 is more easily transmitted. The mirror 300 changes the traveling direction of the terahertz wave and directs it toward the container 100.

  As an example of a terahertz wave generation system used for the light source 200, a laser beam is irradiated to a photoconductive antenna, a semiconductor, or a nonlinear optical crystal, and a terahertz wave is generated using a nonlinear optical effect, optical parametric, difference frequency mixing, or the like. A radiating configuration is conceivable. Other examples of the terahertz wave generation system include a quantum cascade laser (QCL), a resonant tunnel diode (RTD), a gyrotron, a free electron laser (FEL), and the like. Conceivable.

  The container 100 is normally confirmed in a sealed state. However, in order to clarify the figure, in the illustrated container 100, the illustration of the flap portion 12 bonded to the second layer 14 is omitted. ing.

  The terahertz wave passes through the container body 10 of the container 100 and is reflected by the carbon black included in the image 20.

  The image acquisition unit 400 is arranged at a position where the terahertz wave transmitted through the container 100 can be detected, and acquires a transmitted image of the terahertz wave transmitted through the container 100 by imaging the in-plane distribution of the intensity. . As the image acquisition unit 400, for example, a terahertz imager IRV-T0831 (manufactured by NEC Corporation) can be used.

  As a method of reading the image 20 by the image acquisition unit 400, a method of imaging in a planar shape with a light receiving system in which a plurality of light receiving elements are arranged in an array, a scanning line is obtained by first scanning in one dimension with the light receiving elements Then, there is a method of obtaining a two-dimensional planar image by scanning a plurality of times parallel to the scanning line.

  Examples of a terahertz light receiving system used in the image acquisition unit 400 include a pyroelectric detector, a Golay cell, a Schottky barrier diode, a two-dimensional plasma excitation FET (Field Effect Transistor), a semiconductor bolometer, and a superconducting TES (Transition Edge Sensor). A superconductive SIS (Superconductor Insulator Superconductor) mixer or the like can be considered. As another example of a terahertz wave receiving system, a laser beam is irradiated to a photoconductive antenna, a semiconductor, or a nonlinear optical crystal using the same principle as that of a terahertz wave generating system, and nonlinear optical effects and optical parametrics are used. Also, a configuration in which terahertz waves are detected using difference frequency mixing or the like can be considered.

  A lens that adjusts the beam diameter of the terahertz wave may be provided between the light source 200 and the mirror 300 or between the mirror 300 and the image acquisition unit 400.

  FIG. 5 is a diagram showing a transmission image acquired from the container 100 of FIG. Since the terahertz wave incident on the portion of the image 20 is reflected and does not reach the image acquisition unit 400, and the terahertz wave incident on the portion other than the image 20 is transmitted and reaches the image acquisition unit 400, as shown in FIG. In addition, a transparent image representing the same characters “DNP” as the image 20 can be acquired.

  Therefore, by confirming the transmission image, it can be confirmed nondestructively whether or not the container 100 is genuine. Moreover, since the image 20 cannot be visually recognized with the naked eye, forgery of the container 100 can be prevented.

  That is, the authenticity determination of the container 100 can be performed using the above-described transmission image acquisition device 1 as follows.

  FIG. 6 is a flowchart for explaining the authenticity determination method of the container 100 of FIG. As shown in FIG. 6, first, the container 100 is irradiated with a terahertz wave by the light source 200 (step S1).

  Next, the image acquisition unit 400 acquires a transmission image by the terahertz wave that has passed through the container 100 (step S2).

  Finally, the authenticity of the container 100 is determined based on the acquired transmission image (step S3). In other words, when the transparent image is normal, it is determined that the container 100 is “true”, and when the transparent image is not normal, it is determined that the container 100 is “体”.

  As described above, according to the present embodiment, the image 20 containing carbon black is provided between the first layer 13 and the second layer 14 of the container body 10, and the container body 10 reflects or absorbs infrared rays. And it is made to transmit the terahertz wave. Accordingly, since the terahertz wave is reflected by the carbon black included in the image 20 by irradiating the terahertz wave, the concealed image 20 that cannot be confirmed by infrared rays can be confirmed based on the obtained transmission image. Further, since the terahertz wave is safer than radiation such as X-rays, the image 20 can be confirmed safely.

  Further, the cardboard, which is the material of the container body 10, can have high strength even when it is formed of thin paper. Corrugated cardboard formed of thin paper has a high terahertz wave transmittance, so that a clear transmission image can be obtained while ensuring strength. Corrugated cardboard is inexpensive and easily available.

  The container 100 is not limited to the above-described cardboard envelope, and may be a cardboard box or a cardboard container. Also, cardboard may be used instead of cardboard.

  The container body 10 may be formed of an opaque resin as long as it reflects or absorbs infrared rays and transmits terahertz waves. The opaque resin means a resin having such an opacity that the image 20 cannot be visually recognized with the naked eye. If it is such resin, the kind will not be specifically limited, For example, a polystyrene foam, polyethylene, a polypropylene, a polyethylene terephthalate etc. may be sufficient.

The container body 10 may be formed of resin cardboard. In this case, the container 100 is referred to as a cardboard envelope, a cardboard box, or a plastic cardboard box. The container body 10 may be formed of foamed polystyrene as a resin. In this case, the container 100 is referred to as a foamed polystyrene box or a foamed polystyrene container. Styrofoam has a higher transmittance of terahertz waves than other resins, and therefore a clearer transmission image can be obtained. Moreover, it is cheap and easy to obtain.
Even in such a container 100, the above-described effects can be obtained.

  The image 20 may be a barcode, a two-dimensional code, an OCR number, a number, a character, a picture, a symbol, or the like. When the image 20 is a barcode or a two-dimensional code, information recorded in the barcode or the two-dimensional code acquired as a transparent image can be easily read. In this case, if the information read from the bar code or the two-dimensional code is authentic, the container is determined to be “true”. If the information is not authentic, the container is “贋”. Is determined.

By using a bar code or a two-dimensional code as the image 20, it is possible to record a larger amount of information than numbers and characters, so that the forgery prevention can be further improved.
In addition, when using a barcode, the image acquisition unit 400 can be configured in a simple manner by using a method in which the image acquisition unit 400 scans one-dimensionally with a light receiving element to obtain one scanning line. Easy to read.

(Modification of the first embodiment)
The image 20 may be formed using an ink containing a metal as a conductor. As such an ink, a known ink may be used. For example, iron oxide, gold particles, silver particles, platinum particles, or the like may be used as the metal. The composition of each component in the ink is not particularly limited, and an optimum composition is set according to the printing method, the material of the first layer 13, and the characteristics required for the container 100.

  As a specific method for forming the image 20, for example, a micro transfer printer MD-5500 manufactured by Alps Electric Co., Ltd., which is a thermal transfer printer, and a black transfer ribbon containing iron oxide are used. There is a method of printing a JAN (Japanese Article Number) code which is a barcode as an image 20 on plain plain paper.

  Also according to this modification, the terahertz wave is reflected by the metal included in the image 20, and thus the same effect as that of the first embodiment can be obtained.

  Moreover, since the image 20 formed with the ink containing a metal reflects terahertz waves more easily than the image 20 of the first embodiment, a clearer transmission image can be acquired.

(Second Embodiment)
In the present embodiment, a reflection image is acquired instead of the transmission image.

  FIG. 7 is a diagram illustrating a schematic configuration of the reflected image acquisition apparatus 2 according to the second embodiment. As shown in FIG. 7, the reflected image acquisition device 2 includes a light source 200 and an image acquisition unit 400. The light source 200 and the image acquisition unit 400 have the same functions as those in the first embodiment.

  The light source 200 irradiates the container 100 of the first embodiment with terahertz waves in the frequency range of 0.1 THz to 3 THz. As described above, in the present embodiment, the light source 200 configures the light irradiation unit 150 that irradiates the container 100 with the terahertz wave in the frequency range of 0.1 THz to 3 THz.

  The image acquisition unit 400 is arranged at a position where the terahertz wave reflected from the container 100 can be detected, and acquires a reflected image of the terahertz wave reflected from the container 100 by imaging the in-plane distribution of the intensity. .

  The terahertz wave that has entered the portion of the image 20 is reflected and reaches the image acquisition unit 400, and the terahertz wave that has entered the portion other than the image 20 is transmitted and does not reach the image acquisition unit 400. A reflection image representing the characters “DNP” can be acquired.

That is, the authenticity determination of the container 100 can be performed using the reflection image acquisition device 2 as follows. First, the container 100 is irradiated with a terahertz wave by the light source 200. Next, the image acquisition unit 400 acquires a reflection image by the terahertz wave reflected from the container 100. Finally, the authenticity of the container 100 is determined based on the acquired reflection image.
As described above, this embodiment can provide the same effects as those of the first embodiment.

(Third embodiment)
In the present embodiment, the position of the image 20 is different from that of the first embodiment.

  FIG. 8 is a cross-sectional view of the container 100 according to the third embodiment. The appearance of the container 100 is almost the same as that of the first embodiment of FIG. 1, and only the cross-sectional structure is different. That is, as shown in FIG. 8, the container body 10 is formed of a single-layer cardboard in an envelope shape, and the image 20 is provided on the inner surface 10 y of the container body 10. The image 20 can be formed by the same method as in the first embodiment.

According to this embodiment, there is no need to stack two layers of cardboard as in the first embodiment, so that the container 100 can be manufactured easily and inexpensively.
Moreover, the same effect as 1st Embodiment is also acquired.

(Fourth embodiment)
The present embodiment relates to a stacked body 600.

  FIG. 9 is a plan view showing the configuration of the multilayer body 600 according to the fourth embodiment. FIG. 10 is a cross-sectional view showing the configuration of the cross section BB of the laminate 600 of FIG.

  As illustrated in FIGS. 9 and 10, the stacked body 600 includes a first layer 61, a second layer 62, and an image 20.

  The first layer 61 is made of paper or opaque resin. The second layer 62 is made of paper or opaque resin, and is laminated and bonded to the first layer 61.

  The first layer 61 and the second layer 62 reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz.

  The image 20 is provided between the first layer 61 and the second layer 62 and includes a conductor. The image 20 can be formed by the same ink and method as in the first embodiment.

  Using the transmission image acquiring apparatus 1 of the first embodiment, the authenticity of the stacked body 600 can be determined as follows, similarly to the first embodiment.

  FIG. 11 is a flowchart illustrating a method for determining the authenticity of the stacked body 600 of FIG. As shown in FIG. 11, first, the light source 200 irradiates the laminated body 600 with terahertz waves (step S11).

Next, the image acquisition unit 400 acquires a transmission image by the terahertz wave that has passed through the stacked body 600 (step S12).
Finally, the authenticity of the laminated body 600 is determined based on the acquired transmission image (step S13).

  In the present embodiment, the first layer 61 and the second layer 62 are made of cardboard, and the laminated body 600 is used as a cover of a book, for example. In this case, it is possible to confirm whether or not the book is genuine by confirming whether or not the same image as the image 20 appears in the transparent image.

  Note that the modification of the first embodiment or the second embodiment may be combined with the third or fourth embodiment.

  The aspect of the present invention is not limited to the individual embodiments described above, and includes various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the contents described above. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded. The following examples were carried out in order to evaluate the transmissivity with respect to terahertz waves of members that can be used as the container body 10 of the container 100 and the first layer 61 and the second layer 62 of the laminate 600. It is.

Example 1
As shown in FIG. 12, a shield 30 provided with an image 20 was prepared. The shield 30 is configured on the assumption that it is used as a member for the container body 10 of the container 100 and the first layer 61 and the second layer 62 of the laminate 600. The shield 30 is configured to reflect or absorb at least infrared rays. For this reason, the image 20 cannot be acquired by the infrared rays irradiated toward the image from the surface of the shield 30 on which the image 20 is not provided.

  In this embodiment, as the shielding object 30, one plain paper or a laminate of 2 to 100 plain papers was used. As plain paper, α Eco Paper Type R70 manufactured by TANOSSSE was used. The thickness per plain paper was 100 μm. Therefore, the thickness t of the shielding object 30 was in the range of 100 μm to 1 cm.

  As the image 20, a pseudo barcode pattern obtained by arranging a plurality of conductor patterns 21 having a predetermined width was used. Here, “pseudo” means that the barcode pattern does not include any specific information. That is, the width w of each conductor pattern 21 and the interval s between each conductor pattern are set for evaluating the terahertz wave permeability, and are set to give specific information to the barcode pattern. Not a thing. Here, the width w of each conductor pattern 21 and the space | interval s between each conductor pattern were set in the range of 100 micrometers-3 mm. As a material constituting each conductor pattern 21, an aluminum transfer foil was used.

As shown in FIG. 12, it was evaluated whether or not the image 20 provided on the shield 30 could be acquired using the reflection image acquisition device 2. As the light source 200 of the light irradiation unit 150 of the reflection image acquisition device 2, a light source capable of generating a terahertz wave using a nonlinear optical effect generated by irradiating a nonlinear optical crystal with laser light was used. Specifically, the light source 200 includes an Nd: YAG laser light source that generates pump light, a semiconductor laser light source that generates idler light, and a nonlinear optical crystal for generating terahertz waves based on the pump light and idler light. , Including. The wavelength of the pump light was 1064 nm. The semiconductor laser light source is configured as a wavelength tunable light source capable of generating a continuous wave within a range of 1066 to 1075 nm. As the nonlinear optical crystal, a lithium niobate crystal was used. In addition, a lithium niobate crystal was used as a detection element included in the image acquisition unit 400. By using such a light source 200, a terahertz wave generated by so-called optical parametric or difference frequency mixing can be obtained.
The nonlinear optical crystal is a crystal that responds nonlinearly, that is, not proportional to the electromagnetic field of light when intense light such as laser light is incident. The nonlinear optical effect is a nonlinear response, that is, a response that is not proportional to the electromagnetic field of light. The optical parametric and difference frequency mixing described above are a kind of nonlinear optical effect.

Using the light irradiation unit 150 including the light source 200 described above, the shielding object 30 was irradiated with terahertz waves. The frequency of the terahertz wave irradiated on the shield 30 was 1.2 THz, and the intensity was 300 mW. Further, the intensity of the terahertz wave applied to the unit area of the shield 30 was 10.6 mW / cm ² .

  The terahertz wave reflected by the image 20 was detected using the image acquisition unit 400. Further, the in-plane distribution of the detected terahertz wave intensity was imaged, and it was confirmed whether or not the image 20 as a barcode pattern could be identified. As a result, when the thickness of the shield 30 was in the range of 100 μm to 1 cm, the width and interval of each conductor pattern 21 of the barcode pattern could be recognized. That is, the barcode pattern could be identified.

(Example 2)
Except for the point of using corrugated cardboard as the shielding object 30, the permeability of the shielding object 30 to the terahertz wave was evaluated in the same manner as in the case of Example 1. Specifically, a single corrugated board or a laminate of a plurality of corrugated boards is used as the shield 30. The thickness of the shield 30 was in the range of 3 mm to 3 cm.

  Similarly to the case of Example 1, it was evaluated whether or not the image 20 provided on the shielding object 30, that is, the barcode pattern can be acquired using the reflection image acquisition device 2. As a result, the barcode pattern could be identified when the thickness of the shield 30 was in the range of 3 mm to 3 cm.

(Example 3)
Except for the point of using polystyrene foam as the shielding object 30, the permeability of the shielding object 30 to the terahertz wave was evaluated in the same manner as in the case of Example 1. The thickness of the shield 30 was in the range of 50 mm to 200 cm.

  Similarly to the case of Example 1, it was evaluated whether or not the image 20 provided on the shielding object 30, that is, the barcode pattern can be acquired using the reflection image acquisition device 2. As a result, the barcode pattern could be identified when the thickness of the shield 30 was in the range of 50 mm to 200 cm.

(Example 4)
As in the case of Example 1, except that the light source 200 of the reflected image acquisition device 2 is a femtosecond pulsed light as excitation light and a time-domain spectroscopic method that generates a terahertz wave using a photoconductive antenna. Similarly, the permeability of the shield 30 with respect to terahertz waves was evaluated. Specifically, the light source 200 includes a femtosecond pulse light source that generates femtosecond pulse light with a pulse width of 80 fs, and an LT-GaAs photoconductive antenna. Further, femtosecond pulsed light having a pulse width of 80 fs was used as detection light used in the image acquisition unit 400.

  The light irradiation unit 150 including the light source 200 described above was used to irradiate the shield 30 made of plain paper with terahertz waves. As a result, when the thickness of the shielding object 30 is 100 μm, that is, when the shielding object 30 is made of one plain paper, the barcode pattern can be identified. However, when the thickness of the shield 30 is 200 μm, that is, when the shield 30 is configured as a laminate of two or more plain papers, the barcode pattern cannot be identified.

  In general, the intensity of a terahertz wave generated by using a nonlinear optical effect is larger than the intensity of a terahertz wave generated by time domain spectroscopy. For this reason, in Examples 1 to 3, it is considered that the barcode pattern could be identified even when the thickness of the shield 30 was large. In order to identify the barcode pattern more reliably, it is preferable that the intensity of the terahertz wave applied to the shielding object 30 is further larger than the above-described 300 mW, for example, 1 W or more.

  In each of the above-described embodiments, the reflected image acquisition device 2 that acquires an image based on the terahertz wave reflected by the image 20 is used. However, the present invention is not limited to this. Even when the transmission image acquisition apparatus 1 that acquires an image based on the terahertz wave that has passed through the gap of the image 20 is used, the same evaluation regarding the transparency of the shielding object 30 is performed. The result is considered to be obtained.

DESCRIPTION OF SYMBOLS 1 Transmission image acquisition apparatus 2 Reflection image acquisition apparatus 10 Container body 10x Outer surface 10y Inner surface 11 Envelope part 12 Flap part 13,61 1st layer 14,62 2nd layer 15 3rd layer 20 Image 21 Conductor pattern 30 Shielding object 31 Paper DESCRIPTION OF SYMBOLS 100 Container 150 Light irradiation part 200 Light source 300 Mirror 400 Image acquisition part 600 Laminated body

Claims (15)

A container body that is made of paper or opaque resin and that accommodates an object to be accommodated;
An image including a conductor provided on the outer surface of the container body, and
With
The container body reflects or absorbs infrared rays and transmits electromagnetic waves in a frequency range of 0.1 THz to 3 THz. The container body is
The first layer;
A second layer stacked on the first layer,
The container according to claim 1, wherein the image is provided between the first layer and the second layer.   The container according to claim 1, wherein the image is provided on an inner surface of the container body. The container body has an envelope shape, and has an envelope portion and a flap portion provided in the envelope portion,
The container according to claim 2 or 3, wherein the image is provided at a position covered by the flap portion when the flap portion is folded and bonded to the envelope portion.   The container according to any one of claims 1 to 4, wherein the container body is formed of cardboard as the paper or foamed polystyrene as the resin. The container body is formed of one or more plain papers as the paper, cardboard as the paper, or polystyrene foam as the resin,
When the container body is formed of the plain paper, the thickness of the container body is in the range of 100 μm to 1 cm,
When the container body is formed of the corrugated cardboard, the thickness of the container body is in the range of 3 mm to 3 cm,
The container according to any one of claims 1 to 4, wherein when the container body is formed of the polystyrene foam, the container body has a thickness in a range of 50 mm to 200 cm.   The container according to any one of claims 1 to 6, wherein the conductor is carbon black or metal.   The container according to any one of claims 1 to 7, wherein the image is a barcode. A first layer formed of paper or opaque resin;
A second layer laminated to the first layer, formed of paper or opaque resin;
An image including a conductor provided between the first layer and the second layer;
With
The first layer and the second layer are laminated bodies that reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz. A container body that is made of paper or opaque resin and accommodates an object to be accommodated, and an image including a conductor provided on a surface other than the outer surface of the container body, the container body reflecting infrared rays Or a method for determining the authenticity of a container that absorbs and transmits electromagnetic waves in a frequency range of 0.1 THz to 3 THz,
Irradiating the container with electromagnetic waves in a frequency range of 0.1 THz to 3 THz;
Obtaining a transmission image by the electromagnetic wave transmitted through the container, or a reflection image by the electromagnetic wave reflected from the container;
Determining authenticity of the container based on the transmission image or the reflection image;
A method for determining authenticity. A first layer formed of paper or opaque resin, a second layer formed of paper or opaque resin, laminated on the first layer, and the first layer and the second layer. An image including a conductor provided therebetween, wherein the first layer and the second layer reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz. A method of authenticity determination,
Irradiating the laminate with an electromagnetic wave having a frequency range of 0.1 THz to 3 THz;
Obtaining a transmission image by the electromagnetic wave transmitted through the laminate, or a reflection image by the electromagnetic wave reflected from the laminate;
Determining authenticity of the laminate based on the transmission image or the reflection image;
A method for determining authenticity.   The electromagnetic wave produced | generated using the nonlinear optical effect produced by irradiating a laser beam with respect to a nonlinear optical crystal as an electromagnetic wave of the said frequency range of 0.1 THz-3 THz is used. Authentication method. An image acquisition device for acquiring an image provided on a container that is formed of paper or opaque resin and includes a container body that stores a storage object,
The image is provided other than the outer surface of the container body,
The container body is configured to reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz,
The image acquisition device includes:
A light irradiation unit for irradiating the container with electromagnetic waves in a frequency range of 0.1 THz to 3 THz;
An image acquisition unit for acquiring a transmission image by the electromagnetic wave transmitted through the container, or a reflection image by the electromagnetic wave reflected from the container;
An image acquisition device comprising: An image provided in a laminate including a first layer formed of paper or opaque resin and a second layer stacked on the first layer formed of paper or opaque resin is obtained. An image acquisition device that performs
The image is provided between the first layer and the second layer;
The first layer and the second layer are configured to reflect or absorb infrared rays and transmit electromagnetic waves in a frequency range of 0.1 THz to 3 THz,
The image acquisition device includes:
A light irradiation unit that irradiates the laminate with electromagnetic waves in a frequency range of 0.1 THz to 3 THz;
A transmission image by the electromagnetic wave transmitted through the laminate, or an image acquisition unit for acquiring a reflection image by the electromagnetic wave reflected from the laminate;
An image acquisition device comprising:   The electromagnetic wave produced | generated using the nonlinear optical effect produced by irradiating a laser beam with respect to a nonlinear optical crystal is used as said electromagnetic wave of the frequency range of 0.1 THz-3 THz. Image acquisition device.

Images