JP3408844B2 - Anti-counterfeit media - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forgery prevention medium for preventing forgery and copying of secret documents and other important documents by a copying machine.

[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, secret documents and the like are being copied and used more fraudulently. In order to prevent such forgery, various anti-counterfeit media have been conventionally proposed.

For example, as a first example, Japanese Patent Laid-Open No. 2-296
The "copy check sheet" disclosed in Japanese Patent No. 79 is cited. This is because hidden characters and the like are displayed on the medium invisible to the naked eye by the first patterned halftone dots and the second patterned halftone dots having different dot arrangements, and information is displayed in a color tone that is difficult to reproduce by copying. It was recorded. With such a configuration, the above information cannot be copied unless the copy density is increased. When copying is performed with a high copy density, the difference between the first patterned halftone dots and the second patterned halftone dots is conspicuous, and the hidden characters and the like are displayed in a readable form on the copy. As a result, it is possible to determine with the naked eye that it is a copy.

As a second example, Japanese Utility Model Laid-Open No. 61-13856.
The "copy protection paper" disclosed in Japanese Patent No. 3 is cited. This is a printing of a latent image in which line fine particles are applied in the vertical and horizontal directions, and a background other than the latent image is printed with halftone dots which cannot be reproduced by copying. With this configuration, when this paper is copied, the background is not copied, so that the latent image appears remarkably on the copy. Furthermore, by providing the fine lines in the vertical and horizontal directions, at least a part of the latent image can be clearly displayed on the copy regardless of which direction the illumination light of the copying machine is applied. .

As another example, there is one in which copying is prevented by using metallic glossy paper or red paper. When these metallic glossy papers or red papers are copied, the image is blackened and copied, so that it is possible to determine whether or not it is a copy.

[0006]

However, in the above-mentioned first or second example of the prior art, only a hidden character or a latent image is displayed on a copy, and therefore it is determined whether the copy is a copy or not. However, the information recorded on the medium could be read. Therefore, there is no effect in the case where copying itself is inconvenient. Further, the metallic glossy paper or the red paper can make the information of the copy unreadable or difficult to read, but there is a problem that the information of the original itself becomes difficult to read.

The present invention has been made in order to solve the above-mentioned problems, and the recorded information has a good legibility, and it can be surely discriminated whether it is a copy or not. Furthermore, the purpose is to make it difficult to read the information of the copy.

[0008]

In order to achieve the above-mentioned object, a first solution of the anti-counterfeit medium according to the present invention is a background layer (11) made of an opaque body, and at least a part of the background layer. laminated provided, and capable of transmitting transparent or translucent light-transmitting layer incident light to the background layer (12), stacked and provided on the light transmitting layer, characters, figures, symbols,
On the light transmitting layer , a pattern forming layer (13) having a pattern or a pattern or a pattern formed by combining these
Alternatively, an information recording layer (1) that is transparent or semi-transparent and is capable of recording information is laminated on the pattern forming layer.
4) and are provided.

A second solving means is characterized in that the background layer and the pattern forming layer have substantially the same color.

[0010]

In the first solution, a part of the illumination light emitted from the light emitting portion of the copying machine is transmitted through the information recording layer and the light transmission layer and reflected by the background layer. A part of this reflected light is blocked by the pattern forming layer in its optical path and is not received by the light receiving portion of the copying machine. Therefore, the image can be blackened and copied in different colors. Furthermore, it is possible to make a copy of characters and the like difficult to read.

In the second solving means, the background layer and the pattern forming layer have substantially the same color. Therefore, the readability of the information recorded on the information recording layer can be improved and the concealability of the pattern forming layer can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an anti-counterfeit medium according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of an embodiment of the anti-counterfeit medium according to the present invention. As shown in FIG. 1, an anti-counterfeit medium 10 (hereinafter, simply referred to as “medium 10”) includes a background layer 11 and a light transmission layer 1.
2, the pattern forming layer 13, and the information recording layer 14.

The background layer 11 is a layer formed of paper material, synthetic paper, plastic film or the like. In the background layer 11,
An opaque body that does not transmit the illumination light emitted from the light source of the copying machine is used. The light transmission layer 12 is formed by laminating, for example, PET (polyethylene terephthalate) on the background layer 11 by transferring, pasting or the like. For the light transmission layer 12, a transparent body or a semitransparent body that transmits illumination light is used.

The pattern forming layer 13 is formed by, for example, a mesh pattern (whether or not the outer shape of the dots is circular), a line pattern, a tint block, a character, a figure, a symbol, a pattern, or a pattern or a combination thereof. It is a layer in which a pattern is provided on the light transmitting layer 12 by printing or the like. For the pattern forming layer 13, a color material that transmits illumination light as little as possible is used. In the medium 10 of FIG. 1, the light transmitting layer 12 and the pattern forming layer 13 are provided on substantially the entire surface of the background layer 11,
It may be provided only in a part of the area.

The upper surface of the background layer 11 and the pattern forming layer 13 may have any color, but the color tone of the pattern forming layer 13 and the color tone of the background layer 11 are synchronized with each other to make the image of the pattern difficult to see and to keep the hiding property. In order to increase the color, it is preferable that both have the same or similar colors. Further, it is preferable that both of them are white or a light color system similar thereto.
By forming in this way, the information recording layer 1 described later is formed.
By making the background color of the information recorded in 4 to be a single color and white, it becomes possible to have an appearance similar to that of ordinary paper, and to improve the legibility (readability) of the characters and the like recorded in the information recording layer 14. Can be increased.

The information recording layer 14 is a layer for recording information such as characters, and is made of a transparent body or a translucent body which transmits illumination light. The surface of the information recording layer 14 has writing suitability, toner fixing suitability, ribbon transfer suitability, and the like, and in order to improve the fixing property of dyes and pigments such as ink ribbons and toners, for example, surface unevenness due to matte treatment is used. Is applied,
Alternatively, a resin layer containing a porous material is formed.

FIG. 2 shows the information recording layer 14 of the medium 10 of FIG.
FIG. 3 is a cross-sectional view showing a medium 10A (on which an information layer 15 is provided) on which information such as characters is recorded. Hereinafter, how the medium 10A is copied by the copying machine will be described with reference to FIG. A copying machine for copying the medium 10A is a general copying machine conventionally used, that is, an illumination light emitted from a light emitting portion is applied to a copy object at a predetermined angle (for example, 45 °), and the reflected light is perpendicular to the copy. A device for copying by receiving the components. Here, the copy by the copying machine is copied as a whitened image as the amount of the reflected light (the amount of light received by the light receiving unit) increases, and conversely, the amount of reflected light (the amount of light received by the light receiving unit is received. The smaller the amount of light), the more the image is copied as a blackened image.

The illumination light emitted from the light emitting portion of the copying machine to the medium 10A includes (1) the illumination light 2 incident on the information layer 15.
0, (2) the illumination light 30 is incident from a region other than the information layer 15 and is incident on the pattern forming layer 13, and (3) the illumination light 30 is incident from a region other than the information layer 15 and is also the pattern forming layer 1
The illumination light 40 is incident on a region other than 3.

In the case of (1), the illumination light 20 is reflected by the information layer 15 and becomes reflected light 20a, 20b ,. The vertical component 20a of the reflected light is received by the light receiving section of the copying machine. Therefore, the image of the information layer 15 is copied as it is.

In the case of (2), the illumination light 30 is reflected by the pattern forming layer 13 and reflected light 30a, 30b,
・ ・ It becomes. The reflected lights 30a, 30b, ... Are transmitted to the outside through the information recording layer 14, and the vertical component 30a of the reflected light is received by the light receiving section of the copying machine. Therefore, the image of the pattern forming layer 13 is copied as it is.

In the case of (3), the illumination light 40 is incident on the light transmission layer 12, is further transmitted through the light transmission layer 12, is incident on the background layer 11, is reflected by the background layer 11, and is reflected light 40a. , 40b, ... Reflected light 40a, 40b,
.. passes through the light transmission layer 12 and is emitted to the outside. Figure 2
As shown in, the component 40b further passes through the information recording layer 14 and is emitted to the outside, while the vertical component 40a has its optical path blocked by the pattern forming layer 13. Therefore, the vertical component 40a is hardly received by the light receiving section of the copying machine. As a result, the information recording layer 14 on which the illumination light 40 enters
The upper area is blackened and is copied in a color different from that of the original (medium 10A). Similarly, even when the reflected light is transmitted through the pattern forming layer 13, if the optical path is blocked by the information layer 15, the region is blackened and copied in a color different from the original.

Therefore, when the medium 10A is copied,
At least a part of the area is blackened and copied in different colors, and the image on the medium 10A cannot be copied as it is. Therefore, it is possible to determine at a glance whether or not it is a copy. Here, as described above, by making the color of the background layer 11 and the pattern forming layer 13 white or a similar light color system, the difference between the image of the copy and the image of the original can be made more conspicuous. it can.

Further, depending on the thickness of the light transmitting layer 12 and the degree of pattern density of the pattern forming layer 13, the image of the information layer 15 can be unclearly copied, not only forgery prevention but also for the information layer 15 is prevented. It is also possible to make the image difficult to read and prevent copying itself.

Although one embodiment of the anti-counterfeit medium according to the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the present invention. Is. For example, when the light transmission layer 12 is formed of a plastic film or the like, the background layer 11
May be formed by applying a color material on the surface of the light transmitting layer 11.

In the medium 10, the light transmitting layer 12 and the pattern forming layer 13 are provided on substantially the entire surface of the background layer 11, but they may be provided in a part of the background layer 11. Further, the information recording layer 14 does not necessarily have to be provided on substantially the entire surface of the background layer 11, and further, the information recording layer 14 does not necessarily have to be provided on the light transmitting layer 12 and the pattern forming layer 13. Further, the information recording layer 14 may be provided as a part of the upper layer of the light transmission layer 12 and the pattern forming layer 13.

In the medium 10, the light transmission layer 12,
Although the pattern forming layer 13 and the information recording layer 14 are provided, they may be provided on both surfaces. Alternatively, when only the common information is printed on one side, the information recording layer 14 is formed on this side.
Only one may be provided.

The anti-counterfeit medium according to the present invention can be widely applied to various media such as checks, official documents, specifications, design drawings, contracts and the like.

[0028]

According to the anti-counterfeit medium according to the first aspect of the present invention, a part of the reflected light of the illumination light of the copying machine is prevented from being received by the light receiving section of the copying machine. Therefore, at least a part of the image is black. It can be converted into different colors and copied in different colors. As a result, the authenticity of the medium can be reliably discriminated visually. Furthermore, depending on the degree of density of the pattern, etc., it is difficult to read characters, etc.
It is possible to prevent copying itself.

According to the anti-counterfeit medium according to claim 2,
Since the background layer and the pattern forming layer have substantially the same color, it is possible to improve the readability of characters and the like on the information recording layer and enhance the concealability of the pattern forming layer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an example of an anti-counterfeit medium according to the present invention.

2 shows information recorded on the medium 10 of FIG. 1 (information layer 1
FIG. 5 is a diagram illustrating a state when a medium 10A (provided with No. 5) is copied.

[Explanation of symbols]

10 Anti-counterfeit medium 11 background layer 12 Light transmission layer 13 pattern formation layer 14 Information recording layer 15 Information layer

Claims (2)

(57) [Claims] 1. A background layer made of an opaque body, a transparent or semitransparent light-transmitting layer which is laminated on at least a part of the background layer and can transmit incident light to the background layer, stacked and provided on the transparent layer, laminated characters, figures, symbols, patterns, or a picture or patterned layer forming a pattern by these bonds, to the light-transmitting layer or the patterned layer
And a transparent or semitransparent information recording layer capable of recording information, the anti-counterfeit medium. 2. The background layer and the pattern forming layer,
The anti-counterfeit medium according to claim 1, which has substantially the same color.