JP2002268524A - Printed material with optical diffraction image and device for judging authenticity of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hologram which has complicated contents and makes forgery more difficult, a printed product which uses the hologram and a device to judge the authenticity of the printed product. SOLUTION: The optical diffraction image is obtained by forming at least one visible pattern and two or more invisible patterns giving different forms from each other on a plane in one region. The invisible patterns contain at least one pair of such patterns that the irradiation angles of reproducing light to reproduce the patterns differ by 90 deg. from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffraction image formed on a surface of a card or a voucher for preventing forgery and a device for determining the authenticity of a printed matter formed with the light diffraction image.

[0002]

2. Description of the Related Art In recent years, the number of credit cards and gift certificates on which light diffraction images (hereinafter referred to as holograms) represented by holograms having high design properties and high anti-counterfeiting effects for color copying and the like are increasing. I have. The production of holograms requires a special technique, so that only a limited number of companies can produce them. Even if counterfeit products appear, they are easily traced from the above-mentioned background, so that the counterfeit prevention effect is extremely high. Although the hologram has an extremely high anti-counterfeiting effect, the analysis of the technology progresses with the passage of time, and there is a possibility that a hologram that is technically similar may appear. Therefore, many inventions have been introduced in which the following time is delayed by adding a new technology to an invisible area to aim for a higher forgery prevention effect. For example, as disclosed in Japanese Patent Application Laid-Open No. 5-204289, a technique in which a barcode is formed in an invisible state near a hologram designed to be visible, and the barcode is reproduced by a laser beam and read by a line sensor. Is introduced. Also, Japanese Patent Application Laid-Open No. 7-144844 introduces a technique for projecting a single image on a screen by irradiating a reproduction beam in a single direction.

[0003]

SUMMARY OF THE INVENTION Accordingly, there is provided a hologram in which the above technique is made more complicated and forgery is more difficult, a printed matter using the hologram, and a device for determining the authenticity of the printed matter.

[0004]

According to one aspect of the present invention, a light diffraction image includes at least one visible pattern and at least two invisible patterns each having a different shape. Are formed on the same plane in the same region, and the invisible pattern includes at least one set of patterns having different reproduction light irradiation angles for pattern reproduction by 90 degrees.

[0005] In the thin plate-shaped printed matter according to the second aspect of the present invention, one or more visible patterns and two or more invisible patterns each having a different shape are formed on a plane in the same area, The invisible pattern is characterized in that a light diffraction image including at least one set of patterns having different reproduction light irradiation angles for pattern reproduction by 90 degrees is formed on the surface.

According to a third aspect of the present invention, there is provided an apparatus for judging the authenticity of a printed matter on which an optical diffraction image is formed, wherein one or more visible patterns and two or more invisible patterns each having a different shape are the same. And a thin plate-like printed material on the surface of which a light diffraction image including at least one set of patterns different in reproduction light irradiation angle for pattern reproduction by 90 degrees is stored as the invisible pattern. A storage unit, a light source for reproducing a pattern included in the invisible pattern and having a reproduction light irradiation angle different by 90 degrees, and a screen for projecting the pattern are built-in.

According to a fourth aspect of the present invention, in the light diffraction image according to any one of the first to third aspects, the two or more invisible patterns are within a square area having a side of 5 mm or less. It is characterized by being formed in.

According to a fifth aspect of the present invention, there is provided an apparatus for determining the authenticity of a printed matter on which an optical diffraction image is formed, wherein the reproduction light for reproducing the pattern comprises:
It is a laser beam.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a printed matter on which an optical diffraction image is formed and an apparatus for determining the authenticity thereof will be described with reference to the drawings.

FIG. 1 is a diagram for explaining the reproduction of a set of invisible hologram patterns having a reproduction light irradiation angle different by 90 degrees according to the present invention, and FIG. 2 is a diagram showing one visible pattern and each having a different shape. FIG. 3 is a diagram for explaining a true / false determination device that reproduces an invisible hologram by inserting a credit card in which two invisible patterns are formed on the same plane in the same area, and FIG. 3 illustrates the principle of hologram creation FIG. 4 is a diagram for explaining the principle of hologram reproduction, and FIG. 5 is a diagram for explaining an embodiment of a device for determining the authenticity of a printed matter formed with a hologram for reproducing the invisible pattern of FIG. Fig. 6
FIG. 7 is an example of a cross-sectional view of a state where a hologram is transferred to a forgery prevention medium, and FIG. 7 is an example of a cross-sectional view of a state where a hologram seal is attached to the forgery prevention medium.

FIG. 1A is photographed such that the reproduced image A101 looks "true" when the reproduced light 300 is applied to the hologram sheet 1 (the corner C is at the upper right) from the direction shown in FIG. On the other hand, FIG. 1B shows that the reproduced image B102 is “positive” when the hologram sheet 1 (the corner C is rotated 90 degrees to the right from the state of FIG. 1A) is irradiated with the reproduction light 300 from the direction shown in FIG. It was taken to look like " According to the present invention, the reproduced image A is shared with the hologram sheet 1 so that the area is shared and the center of the reproduced image is the same.
The reproduced image B is formed in an invisible state. Depending on the structure of the device for determining the authenticity of a hologram formed on a printed matter, which will be described later, the reproduced image of FIG. 1 may be reproduced right and left or upside down.

FIG. 2 shows that a credit card 7 serving as a forgery prevention medium is stored in a storage section of the authenticity determination device 6 for a printed matter on which a hologram is formed, and the hologram surface is irradiated with reproduction light from directions different by 90 degrees. Screen 6
This is a case where “true” and “positive” reproduced images are reproduced side by side on the surface of “0”. The transferred hologram 10 of FIG.
In FIG. 6, at least one visible hologram image and at least two invisible holograms are formed. The invisible hologram is reproduced by a laser light source provided inside the authenticity determination device 6 of the printed matter on which the hologram is formed, and is projected on the screen 60. In addition, the size of the hologram forming area must be determined in consideration of an error in the storage position of the printed matter on which the hologram is formed. As shown in FIG. 2, in the case of a credit card made of plastic, since the storage state in the storage portion is good, the size of the hologram formation region only needs to be formed in a square of 2 mm square. However, in the case of a paper medium in which expansion and contraction due to humidity and edge damage are concerned, it is necessary to set the above-mentioned hologram formation position wide, and it is necessary to form the hologram at about 5 mm square.

In FIG. 2, besides the case where the forgery prevention medium 7 is a credit card, the case where the medium is a plastic card such as a cash card, an employee card, a qualification certificate, etc. , Stock certificates, etc., may be paper sheets, but in any case, they are gold vouchers and have a risk of being forged. For this reason, if necessary, each time handling is performed or when suspicion arises, the authenticity determination device for the hologram-formed printed matter will be used, but if it is used with common specifications, it is necessary to use a card It is necessary to determine the hologram formation position with respect to the class and the paper certificate, and if the card and the certificate have the same formation position, the storage portion can be used in common. If the card and the certificate are formed at different positions, it is necessary to mount a switching part or switch to a device having a different storage unit.

Referring to FIG. 3, a general method for producing a hologram will be described. A hologram is a hologram in which information of an object is recorded using light interference. When a hologram is irradiated with reproduction light, a hologram can reproduce a three-dimensional image by diffraction. In order to manufacture the hologram 1, the object 5 is irradiated with a highly coherent light such as a laser beam emitted from a laser light source 2 through a lens 4, and the reflected object light 12 is reflected on the reflected object light 12. Irradiation 11 is superposed, and the interference fringes 13 generated by the irradiation are printed on the photosensitive material (1) and recorded. In FIG. 3, the same laser light is diffracted by the half mirror 3 to generate reference light via a lens. The hologram includes a rainbow hologram, an integral hologram, a Lippmann hologram, and the like, and is reproduced by laser light or reproduced by white light. In particular, a rainbow hologram can record interference fringes in an uneven shape,
A large number of copies can be made by emboss copying means. As a method of producing a forgery prevention medium, the irregularities of the hologram are duplicated on a plastic film, and are processed into a heat transfer foil or a label by a method described in detail in FIGS. Alternatively, an anti-counterfeiting medium is prepared by sticking.

FIG. 4 shows a method of reproducing the hologram image created in FIG. 3, and the reproduction is performed by irradiating the reproduction surface with the reproduction light having the same angle as that at the time of hologram generation. The hologram 1 is irradiated with the laser light 2 or light emitted from another point light source via the lens 4, and the resulting virtual image 50 is visually observed with the eyes (Me) or projected on a screen and visually recognized. I do. When a reproduced image is recognized by reflection, a virtual image in the figure is recognized. When the hologram is formed on a transparent film, the real image 51 transmitted from the base side of the film is recognized.

Referring to FIG. 5, one embodiment of the apparatus for determining forgery of a printed matter on which a hologram is formed according to the present invention will be described. In FIG. 5, the laser light emitted from the laser light source 20 is applied to the surface of the hologram 10 transferred to the forgery prevention medium 7 inserted into the storage unit provided on the forgery determination device 6 of the printed matter on which the hologram is formed. The hologram 10 passes through a half mirror. The irradiated light is reflected by the reflection layer formed on the back side of the hologram, and further reflected by the mirror 62 and projected on the screen 60 as diffracted light of the reproduced image A to form the reproduced image A. On the other hand, a part of the laser light emitted from the laser light source 20 is reflected by the half mirror and is reflected by the mirror 6.
4 illuminates the hologram 10, and the illuminated light is reflected by a reflective layer formed on the back side of the unevenness of the hologram, and further reflected by the mirror 63 to reproduce the reproduced image B.
Is projected on the screen 60 as the diffracted light, and forms a reproduced image B.

As described with reference to FIG. 1, when the number of reflections until the light reflected from the hologram surface is projected onto the screen is an odd number, the hologram itself forms an inverted image, and when the number of reflections is even, Has a positive image formed. Since the formed hologram reproduction image is projected on the screen as "authentic", the inserted forgery prevention medium is illuminated to be genuine.

Although not shown, as another embodiment for confirming a reproduced image differing by 90 degrees from the one-step recognition method described above, the position of the light source is switched so that the reproduced image is reproduced in two steps on a screen adjacent to 90 degrees. Can be projected on the screen to check "true" and "correct" separately.

Although not shown, the direction of insertion of the subject with respect to the same light source is 9
In some embodiments, different reconstructed images are confirmed on the same screen using the same light source by changing the angle by 0 degrees. According to this method as well, the reproduced image is projected on the screen, and “true” and “correct” can be confirmed in two steps.

There are the following methods for synthesizing a visible hologram and the above-mentioned set of invisible holograms. For example, in the case of holograms by optical recording, a method of separately exposing holograms to different photosensitive materials and combining them later, and a method of simultaneously setting and exposing a plurality of light sources corresponding to a plurality of subjects at the time of shooting are available. is there. Which one to select depends on the condition of the equipment on the production side. Also,
In the case of a computer generated hologram, two types of invisible hologram information are regularly distributed and coexist on a computer in a partial area of the visible hologram. In addition, it can be synthesized with a grating hologram, a visible hologram having a scattering structure, another hologram having a diffraction grating structure, or a printed material.

The transfer hologram will be described with reference to FIG. A transfer type hologram is a heat-resistant plastic film (base layer) that has a layer that is peeled off by heat and a reflection type hologram formed on it. A hologram of a type in which a hologram foil piece is transferred onto a forgery prevention medium by pressing with a mold made of a conductive rubber. As shown in FIG. 6, the hologram is transferred onto the forgery prevention medium 7, and the adhesive layer 113 bonds the reflection layer 112, which is the lowermost layer of the hologram, to the forgery prevention medium 7. The hologram layer 100 having an emboss pattern is formed on the reflection layer 112. On the outer side of the hologram layer 100, a second protective layer 111 for protecting the hologram layer from wear and chemicals is formed, and on the outermost side, a first protective layer left at the time of transfer is formed. Is formed. This first protective layer is substantially a release material, and may be left on the base film side during thermal transfer.

FIG. 7 shows a case where the hologram is in the form of an adhesive label and is stuck on a forgery prevention medium.
In this case, the anti-counterfeit medium has a rough surface or a curved surface, unlike a card having a mirror-like surface. First, the adhesive material 213 adheres and supports the hologram label on the forgery prevention medium 70. The reflection layer 212 is formed outside the adhesive 213, and the embossed hologram layer 200 is formed outside the reflection layer 212. On the outside of the hologram layer 200, a release layer 210 is formed so as to separate the hologram layer from the hologram layer when the hologram layer is peeled off and reused, and the uppermost layer becomes the base layer 114. I have.

In FIG. 7, when the hologram label once adhered to the forgery prevention medium 70 is peeled off, a part of the hologram layer remains on the surface of the forgery prevention medium 70 and a part is adhered to the base film and peeled off. There is a method of breaking the hologram layer so that it cannot be reused, and such a hologram label is called a brittle label.

In FIGS. 6 and 7, when the forgery prevention medium 7 is a so-called plastic card such as a credit card, a cash card, an employee card, a certificate of qualification, an ID card such as a car license, etc., a thermal transfer hologram is used. Applicable, various types of gift certificates, bills, stock certificates, bonds, traveler's checks, admission tickets, passports and other paper anti-counterfeiting media 70 can be used as heat transfer type or label type holograms, wristwatches, name play Label-type holograms are used for brand-name tags and other decorative items.

Next, materials generally used in the above-described embodiments will be briefly described. As the base film on which the hologram is formed, a transparent or white heat-resistant polyester or polycarbonate film having a thickness of 12 to 50 μm is used depending on the intended use. The anti-counterfeit medium 7 is made of a plastic resin such as polyvinyl chloride, polyester, polycarbonate, or ABS. The anti-counterfeit medium 70 is made of soft vinyl chloride, high-quality paper, medium paper, coated paper, art paper, or the like. Synthetic paper or the like is used. In addition, as the reflection layer, generally, inexpensive aluminum, nickel,
Chromium and the like are often used, and rarely a zinc alloy which is a transparent reflection film is used. As a hologram regenerated light source, a semiconductor laser or an LED is easily used in terms of size, and a He-Ne laser, a mercury lamp, or the like can be used depending on the device.

[0026]

According to the present invention, the invisible diffraction grating pattern reproduced by the laser beam is accommodated in the same area and the position of the image discriminating viewer is changed, or the angle of the reproduced light is changed. Since different images can be reproduced, a higher security effect is achieved as compared with the conventional method of reproducing a single image. In addition, since a normal white light reproducing hologram or a diffraction grating can be formed outside the laser light reproducing hologram area and used as a visible hologram image, the security effect of the hologram itself is added. can do.

[Brief description of the drawings]

FIG. 1 is a view for explaining the reproduction of a set of invisible hologram patterns having different reproduction light irradiation angles of 90 degrees according to the present invention.

FIG. 2 shows a true / false determination apparatus that reproduces an invisible hologram by inserting a credit card in which one visible pattern and two invisible patterns each having a different shape are formed on a plane in the same area into a storage unit. Diagram to explain

FIG. 3 is a diagram for explaining the principle of hologram creation

FIG. 4 is a diagram for explaining the principle of hologram reproduction;

FIG. 5 is a diagram for explaining an embodiment of a device for determining the authenticity of a printed matter formed with a hologram for reproducing the invisible pattern of FIG. 2;

FIG. 6 is an example of a cross-sectional view showing a state where a hologram is transferred to a forgery prevention medium.

FIG. 7 is an example of a cross-sectional view of a state in which a hologram seal is stuck to a forgery prevention medium.

[Explanation of symbols]

Reference Signs List 1 hologram (hologram sheet) 2 light source 3, 63 half mirror 4 lens 5 subject 6 genuineness determination device for printed matter forming hologram 7 credit card (forgery prevention medium) 10 transferred hologram 11 reference light 12 object light 13 interference fringe Reference Signs List 20 laser light source 50 virtual image 51 real image 60 screen 62, 63, 64 mirror 70 anti-counterfeit medium 100, 200 hologram layer 101 reproduced image A 102 reproduced image B 103 diffracted light of reproduced image A 104 diffracted light of reproduced image B 110 first protection Layer 111 Second protective layer 112, 212 Reflective layer 113 Adhesive layer 200 Hologram layer 210 Release layer 213 Adhesive layer 214 Base layer 300 Reproduced light a When reproducing an image with reproduced light at a normal angle, ba sheet is 90 degrees right And the reproduction light at the same angle as a C corner Me first case of reproducing the image

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03H 1/18 G03H 1/18

Claims (5)

[Claims] 1. One or more visible patterns and two or more invisible patterns, each having a different shape, are formed on a plane in the same area, and the invisible pattern has a reproduction light irradiation angle for pattern reproduction. A light diffraction image comprising at least one set of patterns that differ by 90 degrees from each other. 2. One or more visible patterns and two or more invisible patterns each having a different shape are formed on a plane in the same area, and the invisible pattern has a reproduction light irradiation angle for pattern reproduction. Wherein a light diffraction image containing at least one set of patterns differing by 90 degrees is formed on the surface. 3. One or more visible patterns and two or more invisible patterns each having a different shape are formed on a plane in the same region, and the invisible patterns have a reproduction light irradiation angle for pattern reproduction. For storing a sheet-like printed material having a light diffraction image formed on the surface thereof containing at least one set of patterns different from each other by 90 degrees, and a pattern included in the invisible pattern and having a reproduction light irradiation angle different by 90 degrees. And a printed matter on which a light diffraction image is formed, wherein the light source and a screen for projecting a pattern are incorporated. 4. The two or more invisible patterns have a side of 5
The light diffraction image according to any one of claims 1 to 3, wherein the light diffraction image is formed in a square area of not more than mm. 5. The apparatus according to claim 3, wherein the reproduction light for reproducing the pattern is a laser beam.