JPH06206394A - Forgery preventive printed matter and forgery preventive method - Google Patents

Abstract

PURPOSE:To make reading of a printed matter and discrimination of a copy easy, by a method wherein in the printed matter such as a note, the first and second information display layers are formed on a base and optical diffraction patterns are provided respectively on an upper layer or a lower layer of the information display layers each so that their optical diffraction directions become different from each other. CONSTITUTION:In a note 20, letters are printed and information display layers 22A-22D (they are regarded as 22 in the lump) are formed on base 21 and hologram formed layers 23A-23D (they are regarded as 23 in a batch) are formed on its upper layer. The hologram formed layer 23 is constituted of a hologram resin layer, reflective layer, adhesive layer and protective layer. Then the hologram formed layers 23A-23D each are provided so that respective optical diffractive directions are made to differ from each other. In this case, it may be favorable method is constituted so that diffraction is performed at least in two directions different from each other even if the whole are made not to differ always 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 forgery-preventing printed material and a forgery-preventing method for preventing forgery of cash vouchers, securities, and other important documents by copying.

[0002]

2. Description of the Related Art In recent years, copying performance has been remarkably improved by color copying of copying machines. The copy is of high quality and almost invisible to the naked eye as compared with the original of the copy. Along with this, the objects to be copied such as cash vouchers and important documents are being copied and used illegally. In order to prevent such forgery, various methods have been conventionally considered.

FIG. 6 is a side view showing an example of the structure of a conventional anti-counterfeit printed matter, showing the invention disclosed in Japanese Patent Laid-Open No. 56-10493. As shown in FIG. 6, a glass bead layer 3 is formed on the display layer 2 recorded on the base material 1. According to this invention, the light 4a that passes through the center of each glass bead of the glass bead layer 3
Lights 4b, 4 that go straight through only the other peripheral parts
c can be diffracted. Therefore, the display layer 2 can be read by the naked eye, but cannot be copied by the reflection type electronic copying machine.

FIG. 7 is a plan view showing an example of the structure of a printed matter to which a conventional forgery prevention method is applied.
2 shows the invention disclosed by No. 2-18586. As shown in FIG. 7, an optically transparent conversion medium layer 11 composed of a transparent hologram or a diffraction grating is formed on the display layer (not shown) of the base material 10. According to the present invention, when light is incident on the optically transparent conversion medium layer 11, scattered light can be generated. Therefore, there is an effect that the illumination light of the copying apparatus is illegally reflected, and the display section to be originally copied is missing, whitened, blackened, or distorted to make it unreadable or indistinguishable.

Furthermore, as disclosed in Japanese Utility Model Laid-Open No. 58-138670, a half-vapor-deposited seal is stuck on the information layer of a document, and JP-A-60-135598.
There is an iris layer provided on the information layer.

[0006]

However, the above-mentioned conventional anti-counterfeit printed matter and anti-counterfeit method have the following problems. In the invention shown in FIG. 6, since only the light 4a passing through the central portion of each glass bead is made to go straight, the characters of the display layer 2 located therebelow can be read, but the glass beads There is a problem that it becomes difficult to read characters and the like on the display layer 2 located below the peripheral portion.

Further, in the invention shown in FIG. 7, for example, when light is incident from the direction A in the figure, scattered light can be generated, but in the direction B in the figure (a predetermined angle at which the light is not diffracted). When the light was incident from, the scattered light could not be generated. Therefore, there is a problem that it is possible to copy without illicit reflection by observing the direction B in the figure.

[0008] Furthermore, the half-deposited product as in Japanese Utility Model Laid-Open No. 58-138670 has a problem that the printed matter is difficult to see because it exhibits a metallic color. Further, the one provided with an iris layer as in JP-A-60-13598,
Since the reflected light was weak, the printed matter copied was only blurred, and it could not be judged that the printed matter was clearly copied.

The present invention has been made in order to solve the above-mentioned problems, and it is a copy that does not make the printed matter difficult to read and that light is incident from any direction. It is an object of the present invention to provide an anti-counterfeit printed matter and an anti-counterfeit method that can be easily identified.

[0010]

In order to achieve the above-mentioned object, a means for solving the forgery-proof printed matter according to the present invention comprises a base material and first and second information display layers formed on the base material. A first light diffraction pattern formed of a transparent or semi-transparent hologram or diffraction grating formed in a predetermined range on the upper layer or the lower layer of the first information display layer, and the first light diffraction pattern of the upper layer or the lower layer of the second information display layer. A second transparent or semi-transparent hologram or diffraction grating formed in a predetermined area
And a light diffraction direction of the first light diffraction pattern and a light diffraction direction of the second light diffraction pattern are different directions.

The means for solving the forgery prevention method according to the present invention is as follows.
A forgery prevention method for preventing copying of an image of a first information display layer and a second information display layer formed on a base material by a copying apparatus, the method comprising: A first light diffraction pattern formed of a transparent or semitransparent hologram or a diffraction grating formed in a predetermined range, and a transparent or semitransparent hologram formed in a predetermined range of an upper layer or a lower layer of the second information display layer, or A second light diffraction pattern formed of a diffraction grating, wherein the light diffraction direction of the first light diffraction pattern and the light diffraction direction of the second light diffraction pattern are different directions, 1
A part of the light diffracted by the first or second light diffraction pattern is received by the light receiving portion of the copying apparatus together with the image of the second information display layer, and a visual image of the first and second information display layers. The feature is that an image different from is copied.

[0012]

In the anti-counterfeit printed matter solving means, not only the light diffraction pattern is not copied as the light diffraction pattern, but also the images of the first and second information display layers are transparent in a predetermined range of the upper layer or the lower layer. Semi-transparent first and second light diffraction patterns are formed,
Even if the illumination light is emitted from any direction,
In addition, since the light is diffracted in a different direction from that of the second light diffraction pattern, the first information display layer and the second information display layer are copied with different colors, lightness, or vividness, and thus are copies. It is possible to provide an anti-counterfeit printed matter that can be easily identified.

The first means of solving the forgery prevention method is
And the illumination light of the copying apparatus is diffracted in different directions by the second light diffraction pattern, and the light receiving unit of the copying apparatus receives the illumination light diffracted by the first or second light diffraction pattern together with the image of the information display layer. Since light is received, an image different from the visual image of the information display layer is copied. Therefore, since it is possible to easily discriminate the copy, it is possible to prevent unauthorized use of the copy due to forgery.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a forgery-preventing printed material and a forgery-preventing method according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the configuration of an embodiment of a cash voucher to which the forgery-preventing printed material according to the present invention is applied. As shown in FIG. 1, the cash voucher 20 has a base material 21 such as a paper material and a “100
The information display layer 22 (22A to 22) on which the character "0" is printed
D) and the hologram forming layer 23 formed thereabove
(23A to 23D).

FIG. 2 is a side view showing details of the information display layer 22 and the hologram forming layer 23 of the cash voucher 20 shown in FIG. As shown in FIG. 2, the hologram forming layer 23 includes a hologram resin layer 23a, a reflecting layer 23b, and an adhesive layer 23c.
And a protective layer 23d.

The hologram resin layer 23a is made of a material such as a thermoplastic resin, a thermosetting resin, or a mixture thereof. In addition, a moldable substance which has a radically polymerizable unsaturated group and is cured by heat and light or other radiation can be used.

On the lower surface of the hologram resin layer 23a, a relief surface for a hologram image is formed. On this relief surface, a two-dimensional or three-dimensional image that can be reproduced with recorded image white light is recorded as a hologram image, for example, by a relief hologram method. Examples of the method for photographing a hologram image include an image hologram, a rainbow hologram, and a partially formed holographic grating.

Further, the hologram image is not necessarily recorded by a holographic method,
A relief diffraction grating obtained by recording by mechanical means such as direct drawing by an electron beam drawing device or a kind of photosensitive material by photolithography may be partially formed. Further, in general, a relief diffraction grating embossed and duplicated is used. In the present invention, the hologram image includes a diffraction pattern formed by the above diffraction grating.

The reflective layer 23b is a hologram resin layer 23a.
The hologram effect on the relief surface of the hologram image is increased. When used as a transparent hologram, the reflective layer 23b needs to have reflective transparency, and examples thereof include a transparent material having a refractive index different from that of the hologram resin layer 23a and a metal thin film having a thickness of less than 200 Å. . In the former case, the refractive index of the reflective layer 23b may be larger or smaller than the refractive index of the hologram resin layer 23a, but the difference in refractive index is preferably 0.1 or more, and the difference is 0. It is preferably 5 or more, and more preferably 1.0 or more. In the case of the latter, although it is a metal thin film, since the thickness is less than 200Å, the light wave transmittance is large, and therefore, the hologram effect is exerted and the underlying layer is not hidden.

Examples of the material of the reflective layer 23b include Sb ₂ S ₃ (3.0) and ZnS (2.1) which are continuous transparent thin films having a larger refractive index than the hologram resin layer 23a. To form the reflection layer 23b on the hologram resin layer 23a, a thin film forming method such as a vacuum vapor deposition method or a sputtering method may be used.

The adhesive layer 23c is for adhering the hologram forming layer 23 to the information display layer 22, and is made of a transparent or translucent acrylic or rubber adhesive.

The protective layer 23d is provided to protect the hologram forming layer 23 from damage due to external force and to have strength, and is not necessary for the transfer foil. As a material of the protective layer 23d, a simple substance, a mixture, a copolymer or the like of cellulose resin, polyimide resin, polystyrene resin, polyester resin, polyolefin resin can be used. The protective layer 23d has a thickness of 5 to 20.
About 0 μm is preferable. The protective layer 23d may form a hologram image by a relief hologram or the like as long as it can be embossed and may also serve as the hologram resin layer 23a. In this case, the hologram resin layer 23a is unnecessary.

The hologram forming layers 23A to 23A shown in FIG.
3D is provided so that the diffraction directions of light are different from each other. In the present invention, it may be provided so as to diffract in at least two different directions, but in the embodiment, all of the hologram forming layers 23A to 23D are provided so as to diffract in different directions. In order to make the diffraction directions of the hologram image different, it is sufficient to select the directions of the reference light and the object light with respect to the hologram master during photographing. Also, the hologram forming layer 2
When 3 is a diffraction grating, the grating spacing may be different, or the grating direction may be different during transfer. Even if formed in this manner, the hologram forming layer 23 is formed to be substantially transparent or semi-transparent, so that the information display layer 22
A to 22D are easily visible from the outside.

FIG. 3 shows a hologram forming layer 2 according to the present invention.
3 is a perspective view showing a positional relationship between 3 and the information display layer 22. FIG. In the figure, (a) shows the relationship between the hologram forming layer 23 and the information display layer 22 shown in FIGS. 1 and 2.

In FIG. 1A, the information display layer 22 is first formed on the base material 21 (FIGS. 1 and 2), and the hologram forming layer 23, which is the upper layer, has the same size as the information display layer 22. The example shown in FIG. By forming in this way, the information display layer 22 appears to shine due to the hologram forming layer 23.

In the figure, (b) shows the hologram forming layer 23.
Shows an example in which the information display layer 22 is formed in a predetermined range on the base material 21 and a part of the upper layer is formed on the information display layer 22. By forming in this way, the information display layer 22
It seems that the peripheral part of the shines.

In (c) of the figure, the information display layer 22 (broken line portion in the figure) is first formed on the base material 21, and the hologram forming layer 23 is formed in a predetermined range above the base material 21 (wider than the information display layer 22). Shows an example in which is formed. Even if the hologram forming layer 23 is formed in this way, the information display layer 22 appears to shine as in the case of (a).

In the figure (d), the information display layer 22 is first formed in a predetermined range, and the hologram forming layer 23 in which characters and the like are shaped (in a range narrower than the information display layer 22) is formed thereon. An example is shown. Therefore, the information display layer 22
Is easily visible from the outside including the portion located below the hologram forming layer 23, and the hologram forming layer 2
3 appears to shine.

As described above, the hologram forming layer 23 and the information display layer 22 are not limited to those shown in (a) (relationship shown in FIGS. 1 and 2) in the drawings, but (b) to (d) in the drawings. ) May be formed. As a forming method, either one of the hologram forming layer 23 and the information display layer 22 may be formed and then the other may be formed, or the hologram forming layer 23 and the information display layer 22 may be formed simultaneously. May be.

Next, how the cash voucher 20 of FIG. 1 is copied by the copying apparatus will be described. FIG. 4 shows the cash voucher 2 of FIG.
It is a side view which shows a mode when 0 is copied by a copying device. Illumination light 30 from the light emitting unit 25 of the copying apparatus causes the cash voucher 2
When the hologram forming layer 23 and the information display layer 22 of 0 are illuminated, the illumination light 30 is reflected on the upper surfaces of the hologram forming layer 23 and the information display layer 22 to generate reflected light 31, and the reflected light 31 is copied. Copying is performed by entering the light receiving unit 35 of the apparatus.

Generally, in a copying machine, the reflected light 3
The larger the light amount of 1 (the larger the amount of light received by the light receiving unit), the whiter the image becomes. On the contrary, the reflected light 3
The smaller the light amount of 1 (the smaller the amount of light received by the light receiving unit), the more the image becomes black.

First, as shown in FIG. 4, when the illuminating light 30 is incident on the information display layers 22A to 22D from the light emitting portion 25, the illuminating light 30 is received to generate reflected lights 31a to 31d from the information display layers 22A to 22D, respectively. Is emitted. Further, the illumination light 30 is emitted from the light emitting unit 25 to the hologram display layers 23A to 23D.
Is incident on the hologram display layer 23A.
23D to 23D emit reflected lights 31e to 31h, respectively.

The light receiving section 35 receives these reflected lights 31a to 3a.
1d, 31e to 31h are received and copied as an image.
Here, for example, the hologram forming layer 23A and the information display layer 2
2A (that is, the number “1” shown in FIG. 1) is the reflected light 3
1a and 31e are received by the light receiving unit 35 and copied (other numbers are also copied by the same operation).

As shown in FIG. 4, the hologram forming layer 23
Since A to 23D are provided so as to diffract incident light in different directions, the light amounts of the reflected lights 31e to 31h received by the light receiving unit 35 are all different.
Therefore, the image of each character "1000" is copied in a different shade or color.

FIG. 5 is a plan view showing a copy 40 obtained by copying the cash voucher 20 in this manner. Information display layer 22A-
The images of 22D and the hologram images 23A to 23D are copied as images 42A to 42D, respectively. Figure 4
Further, as shown in FIG. 5, since the reflected light 31g from the hologram forming layer 23C is hardly incident on the light receiving section 35, the image 42C is blackened and copied. In addition, most of the reflected light 31f from the hologram forming layer 23B is incident on the light receiving unit 35, so the image 42B
Is whitened and copied. In this way, copy 4
Each character of "1000" of 0 is copied in a different shade or color. Therefore, the copy 40 can be easily discriminated as a copy of the cash voucher 20.

In the case of the forming method as shown in FIG. 3B, the peripheral portion of the information display layer 22 actually has a brilliance due to the action of the hologram forming layer 23, but at least 1 is obtained by copying. Since the peripheral portion of the partial information display layer 22 loses this shine and the peripheral portion is blackened and copied, it is possible to easily determine whether or not it has been copied.
Further, in the case of the forming method as shown in FIG.
Since at least a part of the characters shaped on the hologram forming layer 23 is whitened and copied, it is possible to easily determine whether or not it has been copied.

Although one embodiment of the anti-counterfeit printed matter and the anti-counterfeit method according to the present invention has been described above, the present invention is not limited to the above-mentioned embodiments and various modifications can be made without departing from the scope of the invention. It is possible. For example, in FIG.
As shown in, the formation range of the information display layer 22 and the hologram forming layer 23 may be any range, and further, after forming the information display layer 22, the hologram forming layer 23 is provided as an upper layer. Alternatively, the information display layer 22 may be provided on the hologram forming layer 23 after the hologram forming layer 23 is formed.

Although the information display layer 22 is shown by the numeral "1000", it is not limited to the numeral and may be formed by characters, figures, symbols, or a combination thereof, and may be formed on almost the entire area of the printed matter. .

The hologram layer 23 formed in a predetermined area above or below one information display layer 22 is not limited to one having a diffraction direction of one direction, and may be, for example, the above-mentioned "100".
The hologram forming layer 23 may be formed so as to diffract in a plurality of directions within the area of the numeral “1” of the numeral “0”. Further, the grating of the diffraction grating does not need to be formed by a straight line. For example, a diffraction grating having a continuous curved line as a grating is selected in each area and provided in each information display layer. A diffraction pattern may be formed.

Although the cash voucher 20 is given as an example to which the anti-counterfeit printed matter is applied, the bill is not limited to the cash voucher, bills, securities, lottery tickets, concert tickets, amusement park admission tickets, ski lift tickets, balance certificates. It can be widely applied to a medium having a property value showing an amount and a predetermined condition, such as a book, a bill, a bond, a highway pass, a ticket, a check, an important document such as an official document. Furthermore, the base material 20
Is not limited to paper materials, but can be applied to materials such as telephone cards, credit cards, car tickets, commuter tickets, and other plastic materials.

[0041]

As described above, according to the anti-counterfeit printed matter according to the first aspect, even if the copy is made by irradiating the illuminating light from any direction, the first information display layer and the Since the image is copied with a different color, brightness, or vividness from the second information display layer, it can be easily identified as a copy.

According to the forgery prevention method of claim 2,
The illumination light of the copying apparatus is diffracted in different directions by the first and second light diffraction patterns, and the diffracted light is also received by the light receiving section. Therefore, an image different from the visual image of the information display layer is copied. It Therefore, since it is possible to easily discriminate the copy, it is possible to prevent unauthorized use of the copy due to forgery.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of a cash voucher to which a forgery-preventing printed material according to the present invention is applied.

FIG. 2 is a side view showing details of an information display layer 22 and a hologram forming layer 23 of the cash voucher 20 of FIG.

FIG. 3 is a perspective view showing the relationship between the hologram forming layer 23 and the information display layer 22 according to the present invention.

FIG. 4 is a side view showing how the cash voucher 20 of FIG. 1 is copied by a copying apparatus.

FIG. 5 is a plan view showing a copy 40 obtained by copying the cash voucher 20.

FIG. 6 is a side view showing an example of the configuration of a conventional anti-counterfeit printed matter.

FIG. 7 is a plan view showing an example of the configuration of a printed matter to which a conventional forgery prevention method is applied.

[Explanation of symbols]

 20 Gold Voucher 21 Base Material 22 (22A to 22D) Information Display Layer 23 (23A to 23D) Hologram Forming Layer

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G03H 1/18 8106-2K G06K 19/06 19/10

Claims (2)

[Claims] 1. A base material, first and second information display layers formed on the base material, and transparent or semitransparent formed in a predetermined range of an upper layer or a lower layer of the first information display layer. First light diffraction pattern comprising a hologram or a diffraction grating, and a second light diffraction pattern comprising a transparent or semi-transparent hologram or a diffraction grating formed in a predetermined area above or below the second information display layer. And a diffraction direction of light of the first light diffraction pattern and a diffraction direction of light of the second light diffraction pattern are different directions. 2. A forgery prevention method for preventing copying of an image of a first information display layer and a second information display layer formed on a base material by a copying apparatus, the first information display layer A first light diffraction pattern formed of a transparent or semi-transparent hologram or diffraction grating formed in a predetermined area of the upper layer or the lower layer, and a transparent light formed in a predetermined area of the upper layer or the lower layer of the second information display layer. A second light diffraction pattern formed of a semitransparent hologram or a diffraction grating, wherein the light diffraction direction of the first light diffraction pattern and the light diffraction direction of the second light diffraction pattern are different directions. As a result, part of the light diffracted by the first or second light diffraction pattern is received by the light receiving unit of the copying apparatus together with the images of the first and second information display layers, and the first and second information display layers are received. Information display layer Anti-counterfeit method for causing copied the image different from the visual image.