JP3387320B2 - Securities protected from copy forgery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a transfer foil for preventing copy forgery in a partial area of securities such as stock certificates, bonds, checks, bills, etc., and makes it impossible to reproduce by using a color copying machine. The present invention relates to securities that have been protected against copying and forgery.

[0002]

2. Description of the Related Art Hitherto, the duplication of securities by copying has been occasionally found and has been a hot topic on newspapers and the like. On the other hand, various anti-counterfeit measures have been studied mainly in the printing industry and many have been put into practical use. For example,
As one of the countermeasures against copying, by applying photoengraving technology and printing technology, a latent image consisting of fine constituents with a density different from the surroundings is printed so that it can be seen uniformly by the naked eye. A latent image appears due to the reproduction accuracy of (Japanese Patent Publication No. 55-45400), and the copy obtained by the color copying machine has a different pattern from the original, so it is immediately known that the copy is a duplicate, which makes it difficult to duplicate. A printed matter is known (Japanese Utility Model Publication No. 59-99773).

[0003] Also, as a proof of authenticity, it is attached to securities so that it can be distinguished from counterfeit goods. For example, according to Japanese Utility Model Publication No. 54-143199, A metal glossy portion is provided on the copy part, and when the copy is made, the metal glossy portion is reproduced black due to the reflection of light. There is known a relief-type hologram formed in an irregular shape.
In other words, the color of reflected light changes depending on the viewing angle due to diffraction and interference of light, and the color seen differs depending on the viewing position.
Since it can be easily determined whether it is a counterfeit, this hologram can be copied or reproduced by a color copier by transferring or pasting a hologram in a spot or tape shape on a partial area of securities. is there.

[0004]

However, in recent years,
Due to the improved copy reproduction accuracy of the color copier, it is possible to reproduce with such precision that you will miss it if you do not pay close attention to it. For example, securities having a metallic luster portion as described above are effective in preventing copy / counterfeiting by copying, but if an aluminum foil or the like is attached as a metallic luster portion later, it can be determined whether it is a genuine article or a counterfeit article. Can not. In addition, typical holograms can be reproduced by current color copiers except for the metallic luster, and because the hologram principle and layer structure are simple, they are more likely to be counterfeited. Is getting weaker.

Therefore, according to the present invention, a transfer foil having a color tone and a color in which it is easy to discriminate the authenticity and a copy reproduction is difficult is provided in a partial area of securities, and the authenticity can be easily discriminated visually. In this way, it is to provide securities for which copy forgery is prevented, which makes reproduction by a color copying machine impossible.

[0006]

According to claim 1 of the present invention for solving the above-mentioned problems, a metal formed by laminating two or more layers of a release layer and a metal or metal oxide thin film on a substrate. A transfer foil provided with a thin film layer and an adhesive layer, wherein one of the metal thin film layers is a metal reflective layer having a film thickness of 100 to 10000Å, the metal thin film layer and the metal reflective layer of the transfer foil.
Ink or transparent ink between or on the metal thin film layer
Provides a pattern layer by printing letters, numbers, patterns, etc.
Kicking with a copy preventing forgery, characterized in that it has transferred the transfer foil on a portion of the securities are securities decorated.

[0007]

According to claim 2, in securities copy forgery prevention is applied according to claim 1, thickness of laminated by a layer of adhesive layers or adhesive anchor layer and the adhesive layer in the transfer foil It is characterized in that it is in the range of 2 μm to 5 μm.

[0009]

[Action] As shown in FIG. 1, the transfer foil 18, the metal thin film layer 13 formed by stacking two or more layers of metal or metal oxide thin film
By forming one of these layers as a metal reflection layer 15 made of a metal having a film thickness of 100 to 10,000 Å, the metal thin film layer 13 appears on the surface by transfer, and reflects or transmits a light ray in a predetermined wavelength range, and the naked eye. By changing the viewing angle, the light wavelength in the thin film changes, and the color of the transmitted or reflected light appears to change to rainbow, so that the distinguishability can be improved. Therefore, it is difficult to manufacture a transfer foil, and when copying with a highly accurate color copier,
The color that changes depending on the angle appearing on the surface cannot be reproduced, and moreover, it is copied in black by the metal reflection layer 15 and cannot be reproduced.

In the present invention , as shown in FIG. 2, by providing a pattern layer 14 such as letters, numbers and patterns made of colored ink or transparent ink between the metal thin film layer 13 and the metal reflection layer 15, the naked eye can see. Although this pattern layer can be clearly confirmed on the background having a metallic luster, the pattern layer 14 made of a color ink other than the black ink and the transparent ink can be reproduced by copying with a color copying machine. The background due to the reflective layer 15 is reproduced in black due to the reflection of light. On the other hand, when the pattern layer 14 made of black ink and transparent ink is provided, the pattern made of black ink can be confirmed with the naked eye in the same manner as other colored ink patterns. Since the pattern layer 14 can be recognized because the color change due to the thin film layer 13 is erased, the pattern layer 1 can be recognized by copying with a color copying machine.
In No. 4 as well, the entire transfer foil is reproduced in black due to the reflection of light from the metal reflection layer 15, and the pattern cannot be recognized.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing the structure of a transfer foil in one reference example of the present invention, and FIG. 2 shows an embodiment of the transfer foil of the present invention , in which (a) is a metal thin film. It is a cross-section explanatory drawing of the transfer foil which provided the pattern layer between the layer and the metal reflection layer, and (b) is explanatory drawing (b) represented by the plane seen from the upper part. Further, FIG. 3 is an explanatory view showing a cross section showing a state in which the transfer foil is transferred to a partial area of securities, and FIG. 4 is provided in a partial area on the face of securities in one embodiment. It is an explanatory view represented by a plane showing the transfer foil.

[0012] The copy preventing transfer foil 18 is as shown in FIG.
A release layer 11 on the base material 10 such as a resin film, and a metal
Alternatively, a metal thin film layer 13 made of metal oxide and gold made of metal
A metal foil reflection layer 15 and an adhesive layer 16 are laminated to form a transfer foil.
The thickness of the metal reflection layer 15 is 100 to 10,000 Å
It is what In addition, the metal thin film layer 13 and the metal film
Between the spray layer 15 and the colored ink or transparent ink
By providing the pattern layer 14 of letters, numbers, patterns, etc., the naked eye
Made it easy to distinguish. Furthermore, this transfer foil 18
Facets of securities 20 such as tickets, bonds, checks, promissory notes, etc.
Copy forgery is prevented by transferring to a partial area of 0a.
Securities can be obtained.

Here, the metal used for the metal thin film 13 or the metal reflective layer 15 is a simple substance selected from chromium, nickel, aluminum, iron, titanium, silver, gold and copper, or a mixture or alloy thereof. It is formed. The metal reflection layer 15 may be formed to have a thickness of 100 to 10000Å by a method such as a usual vacuum deposition method or a sputtering method.

As the thin film 13 made of a metal oxide, zinc sulfide (refractive index n = 2.3), titanium dioxide (n
= 2.4), zirconium dioxide (n = 2.0), indium oxide (n = 2.0), tin oxide (n = 2.0), tantalum oxide (n = 2.2), cerium oxide (n = 2.
2), zinc oxide (n = 2.0), silicon dioxide (n = 1.
5), magnesium fluoride (n = 1.4), calcium fluoride (n = 1.4), aluminum oxide (n = 1.
6), magnesium oxide (n = 1.6), gallium oxide (n = 1.7), or the like, or a mixture thereof.

The metal thin film layer 13 is formed by appropriately selecting from the above-mentioned various materials on the basis of optical properties such as refractive index, reflectance and transmittance, weather resistance, chemical resistance, interlayer adhesion, etc. and laminating as a thin film. A known method can be used as the forming method, and the film thickness, the film forming rate, the number of stacked layers, or the optical film thickness (= n
It can be formed by a known method such as an ordinary vacuum vapor deposition method or a sputtering method that can control d, n: refractive index, d: film thickness).

The metal thin film layer 13 made of a metal or a metal oxide can be provided with two or more layers having different layer configurations, and the optical properties of the metal thin film layer 13 are different from those of different layer configurations. Composition and composition of each metal thin film, material,
The thickness and the like are arbitrarily set, and the composition, the combination of materials, the number of laminated thin films and the thickness are not particularly limited, and the optical characteristics of the obtained metal thin film layer are different from each other. Good.

The metal thin film layer 13 reflects or transmits a light beam in a predetermined wavelength range by the metal thin film forming the metal thin film layer 13 and changes the viewing angle to change the light wavelength in the thin film, thereby transmitting or reflecting light. The color of is different. This improves the distinguishability and
It is extremely difficult to manufacture, and exhibits a high anti-counterfeit property.

The metal reflection layer 15 made of metal has a film thickness of 100 to 10000Å, preferably 300 to 2000.
By setting the thickness to Å, even if the other metal thin film layer 13 transmits light, the metal reflection layer of this thickness reflects the light.
Even if it is applied to a color copier, this part will be reflected and reproduced as black, so it cannot be forged by copying.

The copy foil forgery prevention transfer foil 18 is provided with a pattern layer 14 such as letters, numbers or patterns between the metal thin film layer 13 and the metal reflection layer 15 by using an appropriate colored ink or transparent ink. After the transfer, the pattern layer 14 can be clearly confirmed with the naked eye through the metal thin film layer 13 when viewed from above. The method of forming this pattern layer may be a known gravure printing method, an offset printing method, or the like, and the gravure printing method was used in this example.
The pattern layer 14 can be provided on the surface of the metal thin film layer 13, and the effect is the same.

The adhesive layer 16 in the transfer foil for copy prevention may be a commonly used adhesive, and examples thereof include vinyl chloride-vinyl acetate copolymer, acrylic adhesive, polyester polyamide and the like. It is not limited to. However, the adhesive layer 16 has a thickness of 2 μm or more, and preferably has a thickness of about 2 to 5 μm, so that it is difficult to peel off when it is transferred to the securities 20, and peeling with time is prevented. be able to.

The base material 10 of the transfer foil 18 is not particularly limited as long as it has a certain degree of rigidity and surface smoothness. For example, a polymer such as a polyethylene terephthalate film or a polyolefin film is used. Examples include films.

[0022]

EXAMPLES Specific examples will be described below.

Reference Example 1 A polyethylene terephthalate film having a thickness of 25 μm was used as a base material 10 of a transfer foil, and a release layer 11 having a thickness of 1 μm was provided on the polyethylene terephthalate film to oxidize titanium dioxide (n = 2.4). A metal thin film layer 13 made of a metal oxide of tin (n = 2.0) is laminated by a vacuum deposition method to a thickness of 50 Å or less, and aluminum is further deposited by a vacuum deposition method to a thickness of 600.
A metal reflection layer 15 of Å is laminated, and an adhesive layer 16 made of a vinyl chloride-vinyl acetate copolymer resin is formed thereon with a thickness of 3 μm.
Then, a transfer foil 18 for copy forgery prevention was obtained.

This transfer foil 18 was heat-transferred onto a partial area of the face 20a of the securities (in this embodiment, stock certificates were used) 20 to obtain securities for which copy forgery was prevented. The surface of the transferred transfer foil 18 changes to a color such as golden, green, or yellow-green depending on the visual angle such as upward or obliquely at 45 degrees.

The securities 20 for which the copy forgery is prevented
When a copy was made with a color copying machine, the paper surface 20a other than the transfer foil 18 was beautifully reproduced and reproduced.
The part of was copied to black.

Example 2 A polyethylene terephthalate film having a thickness of 25 μm was used as the base material 10, a release layer 11 having a thickness of 1 μm was provided on the film, and cerium oxide (n = 2.2) and silicon dioxide (n) were used. =
The metal thin film layer 13 of the metal oxide of 1.5) is laminated by the vacuum deposition method to a thickness of 50 Å or less, and the character pattern layer 14 is printed in red by the gravure printing method. A metal reflective layer 15 having a thickness of 800Å is laminated on the aluminum by a vacuum deposition method, and an adhesive layer 16 made of a vinyl chloride-vinyl acetate copolymer resin is provided on the metal reflective layer 15 to a thickness of 3 μm to prevent copy forgery. Transfer foil 1
Got 8.

The transfer foil 18 thus obtained was heat-transferred onto a partial area of the bill face 20a of a securities (a check was used in this embodiment) 20 to obtain securities for which copy forgery was prevented. The surface of the transferred transfer foil 18 changes to a color such as golden, green, or yellow-green depending on the visual angle such as upward or obliquely 45 degrees, and the vermilion pattern layer 14 can be clearly confirmed with the naked eye. did it.

When the obtained securities forgery-proofed were copied by a color copying machine, the transfer foil 1
Although the card surface 20a other than 8 and the vermilion pattern layer 14 of the transfer foil were reproduced and reproduced neatly, the pattern layer 14 of the transfer foil 18 was reproduced.
The background part of the metallic luster other than was copied to black.

<Example 3> A pattern layer 14 of characters was printed by a gravure printing method with a transparent ink between the metal reflection layer 15 and the metal thin film layer 13 made of a metal oxide, and otherwise the same as in Example 2. Thus, a transfer foil 18 for copy forgery prevention was obtained. This obtained transfer foil 1
8 is securities (in the case of this embodiment, a check is used) 2
Thermal transfer was carried out to a partial area of the 0th bill face 20a to obtain securities with copy forgery protection. Except for the pattern layer 14, the surface of the transferred transfer foil 18 changes to a color such as golden, green, or yellow-green depending on the visual angle such as upward or obliquely 45 degrees, and the pattern layer 14 part has this color. Since no change was seen, it could be clearly confirmed with the naked eye.

When the obtained copy-protected securities were copied by a color copying machine, the surface 20a other than the transfer foil 18 was beautifully reproduced and reproduced.
The part including the pattern layer 14 was copied in black including the pattern layer 14.

[0031]

Since the present invention has the above-mentioned constitution, it has the following effects. That is, a transfer foil in which a metal thin film layer made of a metal or a metal oxide and a metal reflective layer made of a metal are laminated. By transferring the transfer foil onto securities, the thin film layer appears on the surface, and light rays in a predetermined wavelength range are emitted. The wavelength of light in the thin film is changed by reflecting or transmitting the light and changing the viewing angle with the naked eye, and the color of the transmitted or reflected light looks like a rainbow color, so that the distinguishability can be improved. Therefore, it is difficult to manufacture a transfer foil, and when copying with an accurate color copier, it is not possible to reproduce the color that changes depending on the angle that appears on the surface, and the metal reflective layer copies black. It is impossible to reproduce the transfer foil. Therefore, it is possible to prevent forgery and falsification by copying by thermally transferring this transfer foil to securities.

Further, the thickness of the adhesive layer in the transfer foil is set to 2
When the thickness is at least μm, it is difficult to peel off when transferred to securities, and peeling with time can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view showing a structure of a transfer foil according to a reference example of the present invention.

[Figure 2] shows the configuration of a transfer foil in the embodiment of the present invention, (a) is a sectional view of a transfer foil having a patterned layer between the metal thin film layer and the metal reflective layer, (b ) Is an explanatory view showing this transfer foil in a plane.

FIG. 3 is a cross-sectional explanatory view showing a security forgery-prevented securities of the present invention, showing a state in which the transfer foil is transferred to a partial area of the security.

FIG. 4 is an explanatory view showing a security against which copy / counterfeiting is prevented according to the present invention, and is a plane view showing a state in which the transfer foil is transferred to a partial area of the security.

[Explanation of symbols]

10 ... Base material 11 ... Release layer 13 ... Metal thin film layer 14 ... Pattern layer 15 ... Metal reflective layer 16 ... Adhesive layer 20 ... Securities 20a ... Securities face

Claims (2)

(57) [Claims] 1. A release layer, a metal thin film layer formed by laminating two or more layers of a metal or metal oxide thin film and an adhesive layer are provided on a substrate, and one of the metal thin film layers has a thickness of 100. ~ 100
A transfer foil comprising a the metal reflective layer Å, before
Between the metal thin film layer and the metal reflective layer of the transfer foil, a colored
By printing letters, numbers, patterns, etc. with ki or transparent ink
A securities for which copy forgery prevention has been performed, characterized in that the transfer foil is transferred to a partial area of the securities while a pattern layer is provided . 2. The film thickness of the adhesive layer or the layer in which the adhesive anchor layer and the adhesive layer are laminated in the transfer foil is from 2 μm to 5 μm.
The securities for which copy / counterfeiting prevention has been performed according to claim 1 , wherein the securities are in the range of μm.