JP2007292899A - Authenticity discrimination structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an authenticity discrimination structure having fine information by characters, marks, figures or the like in a concave-convex pattern in an inside or outside of fine characters so as to solve problems that by conventional techniques, a forged product can be produced even when a relatively inexpensive grating plot device is used and that minute microcharacters or geometric microfigures are three-dimensionally gathered to constitute a specified three-dimensional form. <P>SOLUTION: An authenticity discrimination structure is provided in which first hidden information is formed by figures in a hologram or a grating, and further, second hidden information is formed as a concave-convex pattern by characters or marks or a combination of these inside the first hidden information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an authenticity identification structure, and more particularly to an authenticity identification structure in which fine information by characters and symbols is further formed by unevenness inside a fine pattern.

In recent years, it has become possible to obtain extremely sophisticated copies by improving the resolution function and color reproduction function of a color copier.
For this reason, in order to prevent counterfeiting by color copiers, cash notes such as high-value banknotes and gift certificates have the same reflection density as part of the design with small dots and fine lines that cannot be read by the color copier sensor. It is incorporated in the design designed in.
As a result, when trying to copy these high-value banknotes and gift certificates with a color copier, the copier scanner reads out small dots and fine lines, and those parts are identified as white and are identified as copies. .

  In addition, holograms and diffraction gratings are characterized by their visual visibility and require advanced technology for their production, and as a means of preventing counterfeiting for some high-value banknotes and other cash vouchers. Have been used.

For example, “documents” having a diffractive structure that cannot be copied or counterfeited without much cost and effort are provided (see, for example, Patent Document 1).
According to the description in Patent Document 1, in a document such as a securities or an identification card having a macroscopic structure which is engraved on a predetermined surface and exerts a diffractive optical action, the macroscopic structure is 10 pieces / mm. The concavo-convex structure of each partial surface is different from the concavo-convex structure of the adjacent partial surfaces. The authenticity information of the document is represented by at least one group of partial surfaces of these partial surfaces, and the maximum dimension of each partial surface representing the authenticity information is set to a size smaller than 0.3 mm. As a result, the authenticity information can only be identified using auxiliary means such as a loupe.
In addition, a “three-dimensional micropattern display body” is provided because a simple hologram is insufficient as a forgery prevention means (see, for example, Patent Document 2).
According to the description in Patent Document 2, a hologram is composed of a large number of micro-characters or a three-dimensional collection of geometric micro-graphics. It is assumed that it is a “three-dimensional micropattern display body” arranged so as to gather three-dimensionally to form a specific three-dimensional shape body.

Japanese Utility Model Publication No. 9-66 JP 2004-138688 A

The technique described in Patent Document 1 can produce such fake counterfeits even if a relatively inexpensive grating plotting device is used.
In addition, the technique described in Patent Document 2 is a technique in which minute micro characters or geometrical micro graphics are three-dimensionally arranged to form a specific three-dimensional body. It does not use micro characters as a means for authenticating.
Accordingly, an object of the present invention is to provide an authenticity identification structure in which fine information by characters and symbols is further formed by unevenness inside a fine pattern.

  In order to achieve the above object, a first aspect of the authenticity identification structure of the present invention is characterized in that a first hidden information by a pattern is formed in a hologram or a diffraction grating, and the first hidden information is On the inside, the second hidden information by any one of a character, a symbol, or a combination thereof is formed by unevenness.

  The second mode is characterized in that, in the first mode, the second hidden information is information composed of the same character or the same symbol.

  The third mode is characterized in that, in the first mode, the second hidden information is information composed of different types of characters or different types of symbols.

  According to a fourth aspect, in the second and third aspects, the second hidden information is information formed by arranging characters and symbols at different sizes and / or different densities. To do.

  The fifth aspect is characterized in that, in the first to fourth aspects, the first hidden information has a size of 300 μm or less.

1) As in the first aspect, a first hidden information by a pattern is formed in a hologram or a diffraction grating, and inside the first hidden information, either a character, a symbol, or a combination thereof By forming the second hidden information by the irregularities, a person who attempts fraud does not understand the existence and details of the authentic identification structure, and a high anti-duplication effect can be expected.
2) Also, as in the second aspect, in the first aspect, the second hidden information is information composed of the same characters or the same symbols, so that the design is the first hidden information. Since it is difficult to express the gradation of the pattern with the diffraction grating technique, a high anti-duplication effect can be expected.
Further, since the characters or symbols are the same, the authenticity can be determined quickly by a determination device or the like.
3) Also, as in the third aspect, in the first aspect, the second hidden information is information composed of different types of characters or different types of symbols, so that the first hidden information is It is possible to give a tone to a certain pattern, and since it is difficult to express the tone of a pattern by the technique using a diffraction grating, a high anti-duplication effect can be expected.
Further, since the characters or symbols are different, the analysis of hidden information becomes more difficult, and a high copy prevention effect can be expected.
4) As in the fourth aspect, in the second and third aspects, the second hidden information is information formed by arranging characters and symbols with different sizes and / or different densities. As a result, it is possible to give a tone to the pattern which is the first hidden information, and since it is difficult to express the tone of the pattern by the technique using the diffraction grating, a high anti-duplication effect can be expected.
In addition, since different types of characters and symbols are arranged with different sizes and / or different densities, the analysis is made more difficult and an extremely high anti-duplication effect can be expected.
5) In addition, as in the fifth aspect, in the first to fourth aspects, the first hidden information has a size of 300 μm or less, so that some forgery prevention measures are applied to the portion. As a result, it can be expected to have a restraining effect against fraud.
Further, since the first hidden information forming unit can be identified by enlarging with a magnifying glass or the like, it is possible to easily perform authentication identification in the first stage.

The authenticity identification structure of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining the authenticity identification structure of the present invention, FIG. 2 is an example of an enlarged view of a part of the boundary line of the design of FIG. 1, and FIG. 3 is an enlarged view of a part of FIG. An example of FIG. 4, FIG. 4 to FIG. 7 are examples of an enlarged view of FIG. 2, and FIG. 8 is a diagram for explaining an example of second hidden information.
Either the character or the symbol may be used for the second hidden information, but in the present embodiment, an explanation will be given by citing an example in which a character (alphabet) and a part of the symbol are used.

The authenticity identification structure of the present invention will be described with reference to FIG.
For authenticity identification means, a relief hologram of a three-dimensional image expressed by interference fringes caused by interference of light between object light and reference light, a diffraction grating by a two-dimensional image, etc. are used. Reproduction holograms such as rainbow holograms, color holograms, computer generated holograms that mechanically draw images using electron beams, etc., and synthetic holograms that are created by combining characters, symbols, designs, etc. with these holograms are used. Is done.

When using a diffraction grating or a hologram in a transfer form, a release layer is formed on a heat-resistant substrate film, and a thermosetting resin layer is formed thereon, for example, and a thermosetting resin layer is formed. An uneven structure is formed, a reflective layer is formed, a heat-sensitive adhesive layer is formed thereon to form a transfer film, and an extremely thin resin layer including the adhesive layer is formed by a heated metal mold or the like. Is transferred onto a printed matter such as paper.
When using a diffraction grating or hologram in the form of a label, a thermosetting resin layer is formed on the base film, an uneven structure is formed on the thermosetting resin layer, and a reflective layer is formed on the uneven structure Then, an adhesive layer is formed thereon, the adhesive surface is coated with release paper, the substrate film is punched into a predetermined size together with the release paper, and the release paper is peeled off to form an object. Affix and use.

The reflection layer is provided in order to give reflectivity to the concavo-convex surface of the diffraction grating or hologram forming layer.
The reflection layer includes an opaque reflection layer and a transparent reflection layer having transparency. However, when used as a means for authenticity identification as in the present invention, a copy check element is incorporated, and aluminum, nickel, or the like is incorporated. An opaque reflecting layer made of metal is formed.
As a method for forming the reflective layer, there are a vacuum vapor deposition method, a sputtering method, an ion plating method, and the like, which are properly used depending on the purpose.
In addition, as a means for forming a release layer, a thermosetting resin layer, an adhesive layer, an adhesive layer, etc., a general coating method such as a gravure coating method, a die coating method, a knife coating method, a roll coating method, a silk screen, etc. Select from the printing methods to use.

The diffraction grating and hologram of FIG. 1 (which will be described in the following description as an example of a diffraction grating) are included in the diffraction structure of a two-dimensional image, the boundary of characters included, the boundary of a diffraction grating pattern, etc. Are formed with identification information by means of irregularities.
The authenticity identification information includes a star-shaped pattern boundary 11 formed of the diffraction grating 1 and a line segment formed inside the character or inside the diffraction grating pattern, in addition to the boundary of the included character (not shown). It can also be incorporated into part of the design.

With reference to FIG. 2, an example of an enlarged view of a part of the symbol boundary in FIG. 1 will be described.
At the boundary 11 of the diffraction grating pattern, a star-shaped fine pattern 111 with gradation as the first hidden information is formed by the second hidden information due to the unevenness and the diffraction grating 112 formed in part. ing.
The star-shaped fine pattern 111, which is the first hidden information, becomes darker as it goes to the upper left and becomes brighter as it goes to the lower right.
The first hidden information 111 is not limited to a fine star shape, and may be any creature, animal, figure, or the like.
Moreover, although the star shape of the same shape is located in a line in the example of a figure, you may be comprised by different symbols.
The first hidden information 111 is formed with a height “H” (H ≦ 300 μm) that cannot be identified visually.
A diffraction grating is formed in the region 112 other than the first hidden information with a structure in which the first hidden information is difficult to recognize.

An example of an enlarged view of a part of FIG. 2 will be described with reference to FIG.
FIG. 3 is an example of an enlarged view of a part of FIG. 2, but in the partial area 1111 of the fine design 111, as the second hidden information 2, a plurality of characters, a plurality of symbols, or a plurality of A combination of letters and symbols is formed.
In the example of FIG. 3, the partial area 1111 of the fine symbol 111 is formed by arranging the second hidden information 2 by combining the capital letter “A” of the alphabet and the capital letter “V” of the alphabet at high density. It is an example.
When all the areas of the first hidden information by the fine symbol 111 shown in FIG. 3 are in the state of the partial area 1111 of the fine symbol, the first hidden information is in a state of uniform brightness.
In addition, when the size and density of the second hidden information formed on the fine pattern 111, which is the first hidden information, are changed, the first hidden information is given gradation in brightness. It becomes a state.

  On the other hand, in the region 112 other than the first hidden information forming region, for example, a diffraction grating having a grating angle of 90 ° and a grating pitch of 1.0 μm is formed.

An example of an enlarged view of a part of FIG. 2 will be described with reference to FIG.
In the partial area 1111a of the fine symbol 111 in FIG. 2, an alphabetic capital letter “A” is formed as the second hidden information 2a.
A partial region 1111a of the fine pattern 111 is a region that is recognized darkly, and is a region in which the second hidden information 2a is formed at a high density.
Further, in the partial area 1112a of the fine symbol 111 of FIG. 2, the same character type as the uppercase letter “A” of the alphabet formed in the partial region 1111a of the fine symbol 111 of FIG. It is formed with low density.
The partial area 1112a of the fine design 111 is a brightly recognized area, and is an area in which the same character type as the partial area 1111a of the fine design 111 has the same size and is arranged at a different density.
On the other hand, a diffraction grating having a grating angle of 90 ° and a grating pitch of 1.0 μm is formed in the region 112 other than characters and symbols, which are the second hidden information.

With reference to FIG. 5, another example in which a part of FIG. 2 is enlarged will be described.
An alphabetic capital letter “A” is formed in a partial region 1111a of the fine symbol 111 in FIG. The partial area 1111a of the fine symbol 111 is an area that is darkly recognized in which the second hidden information 2a is formed at a high density.
Further, the partial area 1112b of the fine symbol 111 of FIG. 2 has a larger size of the same type of letters of the alphabet capital letter “A” formed in the partial region 1111a of the fine symbol as the second hidden information, It is formed with low density.
A partial area 1112b of the fine symbol 111 is an area that is recognized brightly, and is an area in which the same character type has different sizes and is arranged at different densities.
On the other hand, a diffraction grating having a grating angle of 90 ° and a grating pitch of 1.0 μm is formed in the region 112 other than characters and symbols, which are the second hidden information.

With reference to FIG. 6, another example in which a part of FIG. 2 is enlarged will be described.
In the partial area 1111c of the fine symbol 111 of FIG. 2, alphabets and symbols of different character types are formed in the same size as the second hidden information 2c.
The partial area 1111c of the fine pattern 111 is an area that is recognized darkly, and is an area in which the second hidden information 2c is formed at a high density.
Further, in the partial area 1112c of the fine symbol 111 of FIG. 2, alphabets and symbols formed in the partial area 1111c of the fine symbol as the second hidden information 2d are formed in the partial area 1111c of the fine symbol. The size is smaller than the size.
The partial area 1112c of the fine design 111 is a brightly recognized area, and is an area in which the same character type formed in the partial area 1111c of the fine design 111 has a different size and is arranged at a different density.
On the other hand, a diffraction grating having a grating angle of 90 ° and a grating pitch of 1.0 μm is formed in the region 112 other than characters and symbols, which are the second hidden information.

With reference to FIG. 7, another example of an enlarged view of a part of FIG. 2 will be described.
An alphabetic capital letter “A” is formed in a partial region 1111a of the fine symbol 111 in FIG. The partial area 1111a of the fine symbol 111 is an area that is darkly recognized in which the second hidden information 2a is formed at a high density.
Further, in the partial area 1112c of the fine symbol 111 of FIG. 2, alphabets and symbols formed in the partial area 1111c of the fine symbol as the second hidden information 2d are formed in the partial area 1111c of the fine symbol. The size is smaller than the size.
The partial area 1112c of the fine symbol 111 is a brightly recognized area, and is a region where character types 2d different from the partial area 1111a of the fine symbol are arranged at different densities.
On the other hand, a diffraction grating having a grating angle of 90 ° and a grating pitch of 1.0 μm is formed in the region 112 other than characters and symbols, which are the second hidden information.

An example of the second hidden information will be described with reference to FIG.
The size “H” of the characters and symbols as the second hidden information 2 is set to 0.5 to 50 μm, and the depth “D” of the concave portions of the characters and symbols is set to 0.05 to 0.25 μm. Is done.

  Can be used for banknotes, gift certificates, admission tickets, gift certificates, bills, checks, cards, certificates, warranty cards, etc.

It is a figure for demonstrating the authentication identification structure of this invention. It is an example of the figure which expanded a part of boundary line of the design of FIG. It is an example of the figure which expanded a part of FIG. It is an example of the figure which expanded a part of FIG. It is another example of the figure which expanded a part of FIG. It is another example of the figure which expanded a part of FIG. It is another example of the figure which expanded a part of FIG. It is a figure for demonstrating an example of 2nd hidden information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram or diffraction grating 2, 2a, 2b, 2c, 2d Second hidden information 11 Pattern boundary 111 Fine pattern, first hidden information 112 Area other than first hidden information, area other than characters and symbols 1111 , 1111a, 1111c Partial area of fine pattern 1112, 1112b, 1112c Partial area of fine pattern

Claims (5)

The first hidden information by the pattern is formed in the hologram or diffraction grating,
An authenticity identification structure, wherein the second hidden information by any one of a character, a symbol, or a combination thereof is formed by unevenness inside the first hidden information. The authenticity identification structure according to claim 1,
The second hidden information is an authenticity identification structure characterized in that it is information composed of the same character or the same symbol. The authenticity identification structure according to claim 1,
The second hidden information is an authenticity identification structure characterized in that it is information composed of different types of characters or different types of symbols. In the authenticity identification structure according to claim 2 or 3,
The second hidden information is information that is formed by arranging characters and symbols with different sizes and / or different densities. In the authenticity identification structure according to claims 1 to 4,
The first hidden information is an authenticity identification structure characterized in that the size is not more than 300 μm.

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