JPH07186581A - Laminate - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention makes it difficult to discriminate the layer structure and constituent materials of the laminate itself, and can also prevent forgery and tampering with a unique color tone that enables true / false discrimination of the laminate. In particular, the present invention provides an optical forgery / tampering prevention laminate formed by laminating ceramics. [Structure] A transparent vapor deposition layer 3 formed by laminating a plurality of ceramic materials having different refractive indexes on a substrate 2, a print layer 4 formed in a desired pattern, and a protective layer 5 are formed. Since the printed layer 4 has the same color or a similar color to the light of a specific wavelength region of and the viewing angle of the transparent deposited layer is changed between the patterned printed layers, the color of the transparent deposited layer looks different. , The difference from the color of the print layer becomes clear and can be easily discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optically identifiable laminate, and more particularly to a laminate which is difficult to forge or falsify.

[0002]

2. Description of the Related Art Conventionally, means for preventing forgery has been such that it is difficult to imitate the article itself, or by attaching something difficult to imitate to the article as proof of authenticity, There is something that makes it possible to distinguish between genuine and fake. For example, in the former, fine processing is applied to itself, such as securities such as banknotes, or it is colored in a color that is difficult to imitate. This makes it possible to prevent illegal copying by making it difficult to forge. Furthermore, due to advances in printing and duplication technology, and advances in digital technology such as copying machines, it becomes possible to easily reproduce even the fine processing described above and even when it is difficult to imitate colors. Correspondingly, the technology is becoming finer, making it more difficult to copy and forge.

Since the latter is only attached to an article and is easy to handle, it has been widely used. For example, there is a seal on which an image formed of a relief hologram is formed. This has an effect that a hologram image is formed in an uneven shape and can be mass-produced by embossing. In particular, considering the layer structure, it is difficult to peel off the seal, or it is configured to make it difficult to regenerate after peeling, if you stick it on a card, banknote, certificate etc. once as an object of use, peel it off It is possible to tell at a glance that some or all of the hologram has been destroyed and that some kind of alteration such as falsification has been made to the article as well as forgery.

[0004] As such a prior art, Jitsuko Sho-46-
As described in Japanese Patent No. 4432, there is one in which a release layer is partially provided on the back side of a transparent plastic substrate, which has a pattern, and an adhesive layer is provided thereon.
Further, as described in Japanese Utility Model Publication No. 3-7372, there is a transparent film substrate on which a transparent release layer is partially formed, and a print display layer is provided on the transparent release layer. As described in Japanese Utility Model Publication No. 4-17554, a readhesion preventive pressure-sensitive adhesive sheet is disclosed.

Further, in the case of the seal having the anti-counterfeiting function, it is possible to easily discriminate whether it is a genuine article or a counterfeit article, it is difficult to discriminate the constitution of the laminate itself, and the anti-counterfeiting function does not change depending on the surrounding environment. There is a request.

[0006]

However, since the true / false discrimination due to the high degree of miniaturization will be overlooked unless a very careful view such as enlarging a fine portion or comparing with a genuine article is observed. In addition, the brightness of the place and the confirmation time must be taken sufficiently, and it is becoming inconsistent with the actual transaction status. Moreover, even if the material is special, it cannot be made to be a peculiar material, and the cost becomes high, which is not realistic. Further, since the hologram as described above has a simple hologram principle and a simple structure such as layers, it is apt to be forged, so that the anti-counterfeit effect due to the hologram is weakened.

Further, the above-mentioned sheet having the release layer patterned and the readhesion-preventing pressure-sensitive adhesive sheet exhibit their function by being peeled off, and in the state where they are attached to those for preventing forgery. However, it is difficult to determine the sheet itself.

Therefore, the present invention is a laminated body capable of preventing forgery and tampering having a unique color tone that enables the true and false distinction of the laminated body, while it is difficult to discriminate the laminated structure and constituent materials of the laminated body itself. In particular, it is an object of the present invention to provide an optical forgery / counterfeiting preventive laminate formed by laminating ceramics.

[0009]

The invention described in claim 1 is a laminate in which a transparent vapor deposition layer, a print layer formed in a desired pattern and a protective layer are sequentially laminated on a substrate. A laminated body, wherein the transparent vapor deposition layer is formed by laminating a plurality of ceramic materials having different refractive indexes, and the printing layer has the same color as or a color similar to that of the transparent vapor deposition layer.

The invention described in claim 2 is based on the invention described in claim 1, and is a laminated body characterized in that the transparent vapor deposition layer comprises a combination of a high refractive index layer and a low refractive index layer. is there.

According to a third aspect of the present invention, on the premise of the first aspect of the invention, the transparent vapor deposition layer is made of a ceramic material having a different refractive index, and is a combination of a high refractive index layer and a low refractive index layer. It is a laminated body characterized by being arranged alternately.

According to a fourth aspect of the invention, on the premise of the first aspect of the invention, the transparent vapor-deposited layer is made of a combination of any one of magnesium fluoride, silicon dioxide, or magnesium oxide and zinc sulfide. It is a laminated body characterized by the above.

According to a fifth aspect of the present invention, on the premise of the first aspect of the invention, the transparent vapor deposition layer is made of a combination of one of magnesium fluoride, silicon dioxide, or magnesium oxide and zirconium dioxide. It is a laminated body characterized by the above.

According to a sixth aspect of the present invention, on the premise of the first aspect of the invention, the transparent vapor-deposited layer is composed of a combination of one of magnesium fluoride, silicon dioxide, or magnesium oxide and titanium dioxide. It is a laminated body characterized by the above.

The invention described in claim 7 is based on the invention described in claim 1, wherein the transparent vapor deposition layer is magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride, aluminum fluoride, aluminum oxide or It is a laminated body characterized by comprising a combination of any one of magnesium oxide and cerium dioxide.

The invention described in claim 8 is based on the invention described in claim 1, wherein the transparent vapor deposition layer is magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride, aluminum fluoride, aluminum oxide or It is a laminated body characterized by comprising a combination of any one of magnesium oxide and tantalum oxide.

According to a ninth aspect of the invention, based on the first aspect of the invention, the transparent vapor deposition layer has magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride, aluminum fluoride, aluminum oxide or It is a laminate characterized by comprising a combination of any one of magnesium oxide and zinc oxide.

The invention described in claim 10 is claim 1
Assuming the invention described above, the transparent vapor deposition layer is composed of a combination of any one of magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride, aluminum fluoride, aluminum oxide or magnesium oxide and indium oxide. It is a featured laminate.

The invention set forth in claim 11 is based on the invention of claim 1 and is a laminate characterized in that the base material is black.

The invention described in claim 14 is the same as claim 1.
Based on the described invention, the laminated body is characterized in that the printed layer is composed of an array of a plurality of bar-shaped patterns.

[0021]

The laminated body of the present invention has a property of reflecting or transmitting a light ray in a specific wavelength region by alternately combining a transparent vapor-deposited layer with a ceramic having a low refractive index and a ceramic having a high refractive index. Since the film thickness of the transparent vapor deposition layer changes by changing the angle, the wavelength region shifts, and the colors appear different, which makes it easy to discriminate. In addition, when viewed in the vertical direction, the patterned printed layer formed on the transparent deposited layer has the same color or a similar color to the light of a specific wavelength range. By changing the viewing angle, the color of the transparent vapor deposition layer looks different, and the difference from the color of the printed layer becomes clear.

Further, by coloring the lower layer of the transparent vapor-deposited layer, it becomes easier to see without affecting the color change of transmitted light or reflected light, and the type of color can be selected.

【Example】

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing the constitution of the laminate of the present invention, and FIG. 2 shows the optical reading principle of the pattern of the printed layer of the laminate of the present invention and the transparent vapor deposition layer exposed therebetween ( FIG. 3A is a sectional view and FIG. 3B is a plan view, particularly showing a state as viewed from a direction perpendicular to the laminated body, and FIG. 3 similarly shows a pattern of a printed layer of the laminated body of the present invention and transparent vapor deposition exposed between them. It is sectional drawing (a) and the top view (b) which show the optical reading principle with respect to a layer, and especially the state seen from the diagonal direction is shown. FIG. 4 is a graph showing the visible spectrum of the transparent vapor deposition layer formed of the laminate of the present invention.

The reference numeral 1 in FIG. 1 is a laminate of the present invention, and a substrate 2
A transparent vapor deposition layer 3, a printing layer 4, and a protective layer 5 are sequentially laminated on top. The transparent vapor deposition layer 3 is a ceramic layer including a high refractive index layer 6 and a low refractive index layer 7. The protective layer 5 is provided to protect the surface of the laminated body, and it is necessary that the protective layer 5 has little optical influence.

The substrate 2 is not particularly limited as long as it has a certain degree of rigidity and surface smoothness, and examples thereof include polymer films such as polyester films and polyolefin films. Further, it is possible to color the transparent vapor-deposited layer or the like with a coloring agent within a range that does not affect reading, and it is also possible to coat the surface of the base material 2.

The transparent vapor deposition layer 3 is formed by alternately laminating a plurality of ceramics having different refractive indexes with a specific film thickness. For example, as the low refractive index layer 7, magnesium oxide (refractive index n
= 1.6), silicon dioxide (n = 1.5), magnesium fluoride (n = 1.4), calcium fluoride (n = 1.3)
~ 1.4), cerium fluoride (n = 1.6), aluminum fluoride (n = 1.3), aluminum oxide (n =
1.6) and titanium dioxide (n = 2.4) and zirconium dioxide (n = 2.
0), zinc sulfide (n = 2.3), zinc oxide (n = 2.
1), one of indium oxide (n = 2.0), cerium oxide (n = 2.3), and tantalum oxide (n = 2.1), which is a composite layer laminated in a predetermined thickness. . The transparent vapor deposition layer 3 can also be provided with a plurality of layers formed of the above combinations. In the present embodiment, materials other than those listed above can be used as long as they satisfy the laminating conditions of the constituent layers.

The optical path length in the thin film is changed by reflecting or transmitting a light ray in a predetermined wavelength range to the transparent vapor deposition layer 3 and changing the viewing angle, so that the color of the transmitted light or the reflected light is changed. is there. As a result, the anti-counterfeit property is exhibited.

Any film forming method can be used for the transparent vapor deposition layer 3 as long as the film thickness can be controlled. Among them, the dry method is excellent for forming a thin film, and a physical vapor deposition method such as an ordinary vacuum vapor deposition method or sputtering, or a chemical vapor deposition method such as a CVD method can be used for this.

The total thickness of the transparent vapor deposition layer 3 is preferably 1 μm or less. Especially when the substrate is a polymer resin film, if it exceeds 1 μm, the flexibility becomes poor and the transparent vapor deposition layer 3
This is because cracks may occur in the.

The pattern shape of the printed layer 4 can be arbitrarily determined, and at least part of the vapor deposition layer can be seen from the upper surface. Print layer 4
May be partially formed on the transparent vapor deposition layer 3, or may be formed so as to be substantially in such a state. The printing layer 4 can be formed by a conventionally known printing method such as gravure printing or a coating method. Particularly, in the present invention, a base material that absorbs light is used, and an optical function is provided on the base material. When the color of the printing layer is composed of a single color, the color of this thin film should be the color when viewed from the vertical direction or a color very close to it, and when printing multiple colors. Defines at least one color as the same color or a similar color. The ink that makes up this printing layer is
The condition is not particularly limited, but any condition satisfying the above conditions may be used. Further, a transparent anchor layer may be formed below the printing layer 4. Lower refractive index?

The protective layer 5 is a resin having a light-transmitting property in a specific wavelength region and having abrasion resistance, such as a protective effect against abrasion and scratches from the outside, such as hydroxyethyl cellulose, carboxymethyl cellulose, Polyvinyl alcohol, starch, styrene-maleic acid copolymer, homopolymer or copolymer of methacrylic resin such as polymethylmethacrylate / polyethylmethacrylate, polystyrene, acrylic-styrene copolymer, acrylic resin, polyester resin, chroman resin , ABS resin, nitrocellulose or other resin or fluorine resin, resin mixed with silicon resin as it is or dissolved or dispersed in a solvent such as toluene or xylene for spin coating, roll coating, knife edge Method, offset printing method, gravure printing , A screen printing method using a coating and printing method, to form the protective layer 5. Further, a thermosetting resin, an ultraviolet curable resin, a curable resin such as an electron beam curable resin, or glass can be used as long as it has the above characteristics, but depending on the value of the refractive index, the thickness, etc. Need to consider.

2A and 2B are a sectional view and a plan view showing the optical reading principle of the pattern of the printed layer 4 and the transparent vapor deposition layer 3 exposed between the patterns when the laminate 1 of the present invention is viewed from the vertical direction. As shown in FIGS. 2 and 3, the print layers 4 are arranged in a plurality of bars, and the lower transparent vapor deposition layer 3 is exposed from between the bar-shaped print layers 4. There is. In this case, the transparent vapor-deposited layer 3 and the printed layer 4 have the same color or a color when the thin film of the transparent vapor-deposited layer 3 is viewed from the vertical direction or a color very close to the color as described above, and therefore, they seem to be the same color at the first glance, and therefore the same It is determined to be a layer. That is, this is because the printing layer 4 that reflects a wavelength close to a light ray having a wavelength that is incident on and reflected by the transparent vapor deposition layer 3 is provided.

3A and 3B are a sectional view and a plan view showing the optical reading principle of the pattern of the printed layer 4 and the transparent vapor deposition layer 3 exposed between the patterns when the laminate 1 of the present invention is viewed in an oblique direction. As in FIG. 2, the lower transparent vapor deposition layer 3 is exposed from between the bar-shaped print layers 4. In this case, since the reflected light is viewed in an oblique direction, the transparent vapor deposition layer 3 is formed by alternately laminating a plurality of ceramics having different refractive indexes as described above with a specific film thickness. Since the optical path length changes and the color of transmitted light or reflected light looks different, a color difference (or hue difference) is generated between the printed layer 4 and the printed layer 4, which does not change color depending on the viewing angle. Can be identified.

In addition to the bar pattern as described above, the printed layer 4 can be formed with any pattern such as a design such as letters, numbers and patterns. Further, in the case of being composed of a plurality of colors, by making at least one color the same color or a similar color and changing the viewing angle of the laminated body 1 as shown in FIG. 2 and FIG. When the change occurs, it becomes possible to discriminate the truth.

That is, since the laminated body 1 of the present invention appears to have the same hue in the reflection image from a specific direction, it is determined as an integral structure, and in the reflection image from another direction, the printing layer 4 and the transparent vapor deposition layer 3 are formed. Since they appear to have different hues, they can be easily distinguished from each other. The two colors do not necessarily have to be completely the same color when viewed from a specific direction, and can be distinguished from each other when viewed from another direction.
The color change of the print layer 4 may be generated, or the color of the print layer 4 may be set.

Next, the present invention will be described in detail with reference to examples.

The visible spectrum of the transparent vapor-deposited layer 3 of the laminated body of the present invention thus prepared was measured by an external-visible / visible spectrophotometer.

Example 1 A black polyester film having a thickness of 25 μm was used as the substrate 2, silicon dioxide was used as the low refractive index layer 7 and titanium dioxide was used as the high refractive index layer 6 in the transparent vapor deposition layer 3. However, the number of layers was 5 layers. The total film thickness was 1 μm or less. After forming the transparent vapor deposition layer 3 on the substrate 2, the visible spectrum was measured, and the result is shown in FIG. The central wavelength of absorption of visible light perpendicular to the film is 55
The wavelength was 0 nm, and when the visible light was incident at an angle of 45 degrees, the center wavelength was shifted to the low wavelength side, and a color change occurred.

In this way, the transparent vapor-deposited layer 3 was patterned (such as letters) with a printing ink of the same color as seen in the vertical direction to form a printed layer 4 to obtain a laminate 1. When the laminated body 1 was observed at different viewing angles, no color change occurred in the printed layer 4, but the color of the other transparent vapor deposition layer 3 changed and the pattern formed by the printed layer 4 was clear. I was able to determine.

Example 2 A soda glass film having a black surface and a thickness of 1 mm was used as the base material 2, silicon dioxide was used as the low refractive index layer 7 in the transparent vapor deposition layer 4, and a high refractive index layer 6 was used. Titanium dioxide was used as the material, and the number of layers was five.
The total film thickness was 1 μm or less. Transparent vapor deposition layer 3 on substrate 2
After forming, the transparent vapor-deposited layer 3 was patterned (characters, etc.) with a printing ink of the same color as seen in the vertical direction to form a printed layer 4 to obtain a laminate 1.
When the laminated body 1 was observed at different viewing angles, no color change occurred in the printed layer 4, but the color of the other transparent vapor deposition layer 3 changed and the pattern formed by the printed layer 4 was clear. I was able to determine.

[0042]

The laminate of the present invention has the property of reflecting or transmitting light rays in a specific wavelength region by alternately combining a transparent vapor-deposited layer with a ceramic having a low refractive index and a ceramic having a high refractive index. Since the film thickness of the transparent vapor deposition layer changes by changing the angle, the wavelength region shifts and the colors look different, which makes it possible to easily discriminate between them.
Moreover, when viewed from the vertical direction, the patterned printing layer formed on the transparent vapor-deposited layer with respect to the light of a specific wavelength region has the same color or a similar color, so that it looks the same or a color close to the same color in the specific direction. . By changing the viewing angle of the transparent vapor deposition layer through the pattern-like printed layer, the color of the transparent vapor deposition layer looks different, and the difference from the color of the printed layer becomes clear, so that the discrimination is easy, It exhibits extremely high forgery resistance.

Further, by coloring the lower layer of the transparent vapor deposition layer, it becomes easier to see without affecting the change in the color of transmitted light or reflected light, and the type of color can be selected.

As described above, the anti-counterfeiting effect is extremely high,
It has an excellent effect which is not found in the conventional medium for identification.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a laminated body of the present invention.

FIG. 2 is a cross-sectional view (a) showing an optical reading principle of a pattern of a printed layer and a transparent vapor deposition layer exposed between the patterns of the laminated body of the present invention viewed from a direction perpendicular to the laminated body. b) It is a plan view.

FIG. 3 is a sectional view (a) and a sectional view (b) showing an optical reading principle of a pattern of a printing layer and a transparent vapor deposition layer exposed between the patterns of the laminated body of the present invention when viewed from an oblique direction.
It is a top view.

FIG. 4 is a graph showing a visible spectrum of a transparent vapor deposition layer formed of the laminate of the present invention in Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base material 3 Transparent vapor deposition layer 4 Printing layer 5 Protective layer 6 High refractive index layer 7 Low refractive index layer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Nagahisa Matsudaira 1-5-1, Taito, Taito-ku, Tokyo Within Toppan Printing Co., Ltd. (72) Tsutomu Kakubo 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Fuminobu Fuminobu 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Satoshi Kitamura 1-1-5 Taito, Taito-ku, Tokyo Toppan Imprint Co., Ltd.

Claims (12)

[Claims] 1. A laminated body in which a transparent vapor deposition layer, a print layer formed in a desired pattern, and a protective layer are sequentially laminated on a substrate, wherein the transparent vapor deposition layer has a plurality of ceramic materials having different refractive indexes. And a printed layer having the same color as or a color similar to that of the transparent vapor deposition layer. 2. The transparent vapor deposition layer comprises a combination of a high refractive index layer and a low refractive index layer.
The laminate described. 3. The transparent vapor deposition layer is made of a ceramic material having a different refractive index, and a combination of high refractive index layers and low refractive index layers is alternately arranged. Laminate. 4. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is composed of a combination of any one of aluminum fluoride, aluminum oxide or magnesium oxide and zinc sulfide. 5. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which comprises a combination of any one of aluminum fluoride, aluminum oxide or magnesium oxide and zirconium dioxide. 6. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is composed of a combination of any one of aluminum fluoride, aluminum oxide or magnesium oxide and titanium dioxide. 7. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is composed of a combination of any one of aluminum fluoride, aluminum oxide and magnesium oxide and cerium dioxide. 8. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is made of a combination of any one of aluminum fluoride, aluminum oxide, and magnesium oxide and tantalum oxide. 9. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is composed of a combination of any one of aluminum fluoride, aluminum oxide or magnesium oxide and zinc oxide. 10. The transparent vapor deposition layer comprises magnesium fluoride, silicon dioxide, calcium fluoride, cerium fluoride,
The laminate according to claim 1, which is composed of a combination of indium oxide with any one of aluminum fluoride, aluminum oxide and magnesium oxide. 11. The laminate according to claim 1, wherein the base material is black. 12. The laminated body according to claim 1, wherein the printed layer comprises an array of a plurality of bar-shaped patterns.