JPH07256824A - Laminate - Google Patents

Abstract

PURPOSE:To provide a laminate for preventing optical forgery and alteration difficult in the discrimination of the layer constitution or constitutional materials thereof and capable of being subjected to the discrimination of genuineness from the mechanical reading of reflected light with a specific wavelength. CONSTITUTION:The transparent ceramic layer 4 laminated on a base material 2 or metal foil is constituted of zinc oxide doped with trivalent or more metal or a semiconductor. This transparent ceramic layer 4 is transparent and shows absorption in an infrared region, especially, in a wavelength region of 1000nm or more corresponding to the dopant amt. (carrier concn.) of zinc oxide or the thickness of the ceramic layer. Therefore, infrared rays emitted within this wavelength region are attenuated at the time of the transmission through the ceramic layer and, from the quantity of the reflected light from the ceramic layer, a laminate can be specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optically distinguishable laminate, and more particularly to a laminate exhibiting absorption in a specific wavelength region.

[0002]

2. Description of the Related Art Conventionally, it is difficult to imitate an article itself as a means for preventing counterfeiting, and it is easy to find a trace of fraudulent activity such as counterfeiting or falsification, so that a genuine article and a fake article can be reliably assured. There is something that can be identified. For example, like securities such as banknotes, they are subjected to fine processing or colored with colors that are difficult to imitate, or as a special material, imitation of imitation or printing technology, or by copying machine This makes it possible to prevent forgery by making illegal copying difficult. 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.

Further, there is an identification body which is difficult to copy or forge and which can be read by a machine. For example, Japanese Patent Laid-Open Nos. 4-233684 and 5-5078.
As described in Japanese Patent Publication No. 8 etc., there is a method in which a bar code pattern consisting of a diffraction grating representing specific information is formed on the surface of a card, and the information is read by detecting reflected light of laser irradiation light. . Further, there is a method of reading a reflection image or a transmission image of a relief type hologram, a volume phase type hologram, or the like by irradiating the relief type hologram or volume phase type hologram with laser light or white light, which has been put into practical use. These are formed directly on the medium or object to be identified, through a seal with a hologram image on the base material, or a transfer foil with a hologram image that can be peeled off on the transfer surface. A hologram image may be formed on the medium / object to be identified. In this way, the optically readable information is provided on the identification object, and the identification information can be easily read.

Further, as a simpler and more reliable method of determining authenticity, Japanese Patent Application Laid-Open No. 2-16044, and Japanese Patent Application Nos. 5-244062 and 5-2404062 by the present applicant.
No. 244063 and Japanese Patent Application No. 5-244064. These are the viewing angles (ie the supporting angles)
It is made by forming a multilayer interference layer that causes a unique color shift (color change of reflected light) in accordance with the above. Since the visible color differs depending on the observation position, it is confirmed whether it is genuine or not. Whether or not it can be determined.

In addition, these laminates are constructed so that they are difficult to peel off or difficult to regenerate after peeling in consideration of the layer structure. According to this, the cards, bills,
It is possible to tell at a glance that some or all of the hologram has been tampered with, as well as being counterfeited, because part or all of the hologram is destroyed if it is peeled off after it has been attached to a certificate or the like. It was done.

As described in JP-B-46-4432, the prior art for making such peeling difficult or regenerating after peeling is difficult is to provide a peeling layer partially on the back side of a transparent plastic substrate. There is one in which it has a pattern and an adhesive layer is provided on it. Also, fairness 3-73
As disclosed in Japanese Patent Laid-Open No. 72-72, there is one in which a transparent release layer is partially formed on the back side of a transparent film base material, and a print display layer is provided on the transparent release layer.
As described in Japanese Patent No. 7554, a readhesion-preventing pressure-sensitive adhesive sheet is disclosed.

Further, in the case of a laminated body having an anti-counterfeiting function, it can be easily discriminated whether it is a genuine article or a forged article, it is difficult to discriminate the constitution of the laminated body itself, and the anti-counterfeiting function does not change due to the surrounding environment. Is required.

[0008]

However, the true / false discrimination due to the high degree of miniaturization of the printed matter should be overlooked if the minute portion is magnified or compared with the genuine article so as not to pay attention. However, it is becoming unsuitable for the current situation, for example, because the brightness of the place and the confirmation time must be taken sufficiently. 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, the diffraction grating and the hologram are necessary for recording information or performing highly accurate authenticity determination, but are not cheap to use for simple authenticity determination,
The device for reading it is also the same. Further compression, bending,
The mechanical strength against scratching is not sufficient, and reading may be affected even when used in such a bad environment.

Further, the above-mentioned sheet having the release layer patterned and the re-adhesion preventive 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, in the present invention, it is difficult to discriminate the layer structure and the constituent materials of the laminate itself, and the optical forgery / counterfeiting prevention is capable of performing the genuine / counterfeit discrimination based on the mechanical reading of the reflected light of a specific wavelength. It aims at providing the laminated body for.

[0011]

According to a first aspect of the present invention, there is provided a laminate in which a metal layer, a transparent ceramic layer and a protective layer are sequentially laminated on a substrate, and the transparent ceramic layer is 3 layers.
It is a laminate characterized by being zinc oxide formed by doping a metal having a valence of at least or a semiconductor.

According to a second aspect of the present invention, in a laminated body in which a transparent ceramic layer and a protective layer are sequentially laminated on a metal foil, the transparent ceramic layer is an oxide formed by doping a metal having a valence of 3 or more, or a semiconductor. It is a laminated body characterized by being zinc.

According to a third aspect of the present invention, in the laminated body according to the first and second aspects, the trivalent or higher metal or semiconductor is aluminum, boron, scandium, gallium, silicon, yttrium, ytterbium, indium or thallium. Is characterized in that.

According to a fourth aspect of the invention, in the laminated body according to the first aspect, the metal layer is gold, aluminum, nickel or chromium.

According to a fifth aspect of the invention, in the laminated body according to the second aspect, the metal foil is gold, aluminum, nickel, or chromium.

According to a sixth aspect of the present invention, in the laminated body according to the first and second aspects, the protective layer is transparent in the visible wavelength region and the wavelength region of 1000 to 3000 nm.

The invention according to claim 7 is the laminated body according to claim 1 or 2, characterized in that a printing layer is provided on the transparent ceramic layer.

The invention described in claim 8 is the laminated body according to claim 1, characterized in that a printing layer is provided on the metal layer.

According to a ninth aspect of the invention, in the laminated body according to the first aspect, a printing layer is provided on the metal foil.

According to a tenth aspect of the invention, in the laminated body according to the seventh and eighth aspects, the printing layer is 1000 to 30.
It is characterized by absorbing electromagnetic waves in the wavelength region of 00 nm.

The eleventh aspect of the invention is characterized in that, in the laminated body according to the first aspect, an adhesive layer is provided on the non-laminated side of the base material.

[0022]

According to the laminate of the present invention, the transparent ceramic layer to be laminated on the base material or the metal foil is made of zinc oxide doped with a metal having a valence of 3 or more, or a semiconductor to obtain a transparent ceramic. The layer is transparent in the visible region and absorbs in the infrared region, and particularly in the wavelength region of 1000 nm or more, depending on the dopant amount (carrier concentration) and film thickness, it is irradiated in this wavelength region. The infrared rays are attenuated when they pass through the transparent ceramic layer, and the laminate can be specified by measuring the amount of reflected light.

Further, when the printing layer is provided on the transparent ceramic layer, the above-described function of the transparent ceramic layer exposed between the information and the printed image can be obtained.

【Example】

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

FIG. 1 is a sectional view showing the constitution of the laminate of the present invention, FIG. 2 is a sectional view showing another constitution of the laminate of the present invention, and FIG. 3 is a printed layer of the laminate of the present invention. 2A is a cross-sectional view and FIG. 2B is a plan view showing the optical reading principle of the transparent ceramic layer exposed between the pattern of FIG.
In particular, a state in which the laminate is irradiated with electromagnetic waves from above is shown, and FIG. 4 is a sectional view (a) showing an optical reading principle of the transparent ceramic layer provided on the pattern of the printing layer of the laminate of the present invention. It is a figure and (b) top view, and shows the state where especially the layered product was irradiated with electromagnetic waves from the above. FIG. 5A is a sectional view and FIG. 5B is a plan view showing the optical reading principle of the pattern of the printed layer of the laminated body of FIG. 2 and the transparent ceramic layer exposed between them. FIG. 6 shows a state in which electromagnetic waves are radiated from a direction, and FIG. 6 is a sectional view (a) and a plan view (b) showing an optical reading principle of the transparent ceramic layer provided on the pattern of the printed layer of the laminated body of FIG. In particular, it shows a state in which the laminate is irradiated with electromagnetic waves from above. FIG. 7 is a graph showing the reflectance of the transparent ceramic layer according to the laminate of the present invention.

1 of FIG. 1 is a laminate of the present invention, which is a substrate 2
A metal layer 3, a transparent ceramic layer 4, and a protective layer 5 are sequentially laminated on the top. The transparent ceramic layer 4 is zinc oxide formed by doping a metal having a valence of 3 or more or a semiconductor.
The protective layer 5 is provided to protect the surface of the laminate 1, and it is necessary that the reading layer and the like have a small optical influence on the reading wavelength.

The base material 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. Alternatively, metal, glass, paper with a sealing process, or the like may be used.

The metal layer 3 may be made of a material having a high light reflectance such as gold, aluminum, nickel, or chromium, and is not limited to the above-mentioned ones, and has a good reflection equal to or higher than that of metal. Any material having a ratio can be used. The formed film thickness is not particularly limited as long as good reflectance can be obtained, but it is preferably 700 Å or more. The reading irradiation light that has entered the laminate 1 is reflected by the metal layer 3. For this metal layer 3, a physical vapor deposition method such as a normal vacuum vapor deposition method or sputtering, or a chemical vapor deposition method such as a CVD method can be used, and the metal layer 3 is arbitrarily selected according to the material forming the metal layer. You can choose. For example, a foil made of the above metal may be attached to the base material 2. Alternatively, a coating liquid in which fine particles such as metal flakes are dispersed in a resin in a solvent may be applied.

The transparent ceramic layer 4 is a metal having a valence of 3 or more,
Alternatively, it is composed of zinc oxide doped with a semiconductor, and the metal or semiconductor having a valence of 3 or more is aluminum, boron,
It is selected from scandium, gallium, silicon, yttrium, ytterbium, indium and thallium. Any film forming method can be used for the transparent ceramic layer 4 as long as the film thickness can be controlled. Among them, the dry method is superior for the formation of a thin film, and includes a normal vapor deposition method, a physical vapor deposition method such as sputtering, and a CVD method.
Chemical vapor deposition methods such as the method can be used.

The transparent ceramic layer 4 preferably has a film thickness of 2000 Å or less. Especially when the substrate 2 is a polymer resin film, if it exceeds 2000 Å, it is 1000 to 3000 nm.
Since the absorption of irradiation light is close to 100% in the wavelength range of
When the reflectance becomes 0, the flexibility of the thin film becomes poor,
This is because cracks may occur in the transparent ceramic layer 3.

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, and is particularly transparent in the visible region. It is sufficient that it is present and reflects / absorbs in the wavelength range of 1000 to 3000 nm and does not inhibit the function of zinc oxide formed by doping a metal or semiconductor having a valence of 3 or more. For example, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, starch, styrene-maleic acid copolymer, homo- or copolymer of methacrylic resin such as polymethyl methacrylate / polyethyl methacrylate, polystyrene,
Acrylic-styrene copolymer, acrylic resin, polyester resin, chroman resin, ABS resin, nitrocellulose resin or fluorine resin, resin mixed with silicon resin as it is, or dissolved in a solvent such as toluene or xylene The dispersed material is applied by a coating / printing method such as a spin coating method, a roll coating method, a knife edge method, an offset printing method, a gravure printing method, or a screen 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. If the transparent ceramic layer 4 has mechanical strength and durability against the external environment, the protective layer 5 can be omitted.

Although not shown, the laminate 1 having the above-mentioned layer structure is irradiated with infrared rays of a specific wavelength, the infrared rays pass through the protective layer 5, are reflected by the metal layer 3 via the transparent ceramic layer 4, and are again transparent. The reflected light is measured through the ceramic layer 4 and the protective layer 5. At this time, since the infrared rays are attenuated when passing through the transparent ceramic layer 4, the amount of light is compared with a preset characteristic value of the transparent ceramic layer 4 to determine the authenticity. The rate of this attenuation is determined by the amount of dopant (carrier concentration) and the film thickness.

The laminated body 6 shown in FIG. 2 comprises a metal foil 7 on which a transparent ceramic layer 4 and a protective layer 5 are provided. The transparent ceramic layer 4 and the protective layer 5 are laminated as shown in FIG. It is the same as that used for body 1. Metal foil 7
Is not limited to the above, as long as it has a high light reflectance such as gold, aluminum, nickel, or chrome like the metal layer 3, and the thickness can obtain strength and predetermined reflectance. Anything can be used.

Next, the laminated body 8 shown in FIG.
The metal layer 3, the transparent ceramic layer 4, the printed layer 9, and the protective layer 5 are sequentially laminated on top of this. Further, the laminated body 10 shown in FIG. 4A has a structure in which the metal layer 3, the printed layer 9, the transparent ceramic layer 4, and the protective layer 5 are sequentially laminated on the base material 2.
In the drawings, the same numbers indicate the same layers.

The pattern shape of the printed layer 9 can be arbitrarily determined, and in the laminated body 8 shown in FIG. 3, at least a part of the transparent ceramic layer can be seen from the upper surface. That is, the printed layer 9 may be partially formed on the transparent ceramic layer 4, or may be formed so as to be substantially in such a state. In addition, in the laminated body 10 shown in FIG. 4, a part of the metal layer may be seen from the upper surface. That is, the print layer 9 may be partially formed on the metal layer 3, or may be formed so as to be substantially in such a state.

The printing layer 9 can be formed by a conventionally known printing method or coating method such as gravure printing. Particularly in the present invention, the printing layer 9 is 1000 to 3000.
Any material may be used as long as it exhibits absorption of electromagnetic waves having a wavelength of nm. The ink or coating agent forming this printing layer is not particularly limited, but may be any one that satisfies the above conditions.

Further, when the color of the printing layer is composed of a single color, the color of this thin film may be a color viewed from above or a color very close to it, and a transparent anchor layer is formed below the printing layer 9. May be.

FIG. 3 is a sectional view and a plan view showing an optical reading principle of the pattern of the printed layer 9 and the transparent ceramic layer 4 exposed between the patterns of the laminated body 8 of the present invention as seen from the vertical direction. The print layer 9 represents a pattern 20 of “TOP” as shown in FIG.
The transparent ceramic layer 4, which is the lower layer, is exposed from the area where the transparent layer is not formed. This laminated body 8 is irradiated with an electromagnetic wave (A) having a specific wavelength in the wavelength range of 1000 to 3000 nm, and the light amount of the electromagnetic wave (B) reflected by the metal layer 3 is detected by a sensor (not shown). Since the amount of the reflected electromagnetic wave (B) is limited depending on the amount of the dopant and / or the film thickness of the transparent ceramic layer 4, the authenticity can be determined based on this.
Since the electromagnetic waves applied to the printing layer 9 are absorbed here,
It is not detected by the sensor, and the sensor is the metal layer 3
Only the reflected wave of the electromagnetic wave that has reached is detected.

FIG. 4 is a sectional view and a plan view showing an optical reading principle of the pattern of the printing layer 9 and the transparent ceramic layer 4 exposed between the patterns when the laminate 10 of the present invention is viewed from the vertical direction. As shown in FIG. 4B, the printed layer 9 represents the “TOP” pattern 20, and the lower metal layer 3 is exposed from the place where the printed layer 9 is not formed. Similar to the laminated body 8 of FIG. 3, the laminated body 8 is irradiated with an electromagnetic wave (A) having a specific wavelength in the wavelength range of 1000 to 3000 nm, and the amount of light of the electromagnetic wave (B) reflected by the metal layer 3 is detected by the sensor. It is detected by (not shown). Since the amount of the reflected electromagnetic wave (B) is limited depending on the amount of the dopant and / or the film thickness of the transparent ceramic layer 4, the authenticity can be determined based on this. Since the electromagnetic waves that have reached the printing layer 9 are absorbed here, they are not detected by the sensor, and the sensors detect only the reflected waves of the electromagnetic waves that have reached the metal layer 3.

As described above, the transparent ceramic layer 4 and the printed layer 9 are the same layer by making the color when viewed from above or a color very close to it so that they seem to be the same color at first glance. Therefore, it is possible to make the print layer 9 as secret as a hidden character and further improve the forgery prevention effect.

In addition to the above-mentioned characters, the printing layer 9 can be formed with any pattern such as a design such as characters, numbers and patterns.

The laminated bodies 11 and 12 shown in FIGS.
The printed layer 9 may be formed similarly to the laminated body 8 shown in FIG. 3 and the laminated body 10 shown in FIG. 4, and has at least the same effect.

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

The reflectance of the produced laminate of the present invention was measured.

Example 1 A transparent polyester film having a thickness of 12 μm was used as the substrate 2, and aluminum was vapor-deposited on the metal layer 3 by a vacuum vapor deposition method to a thickness of 800 Å. Next, a zinc oxide layer 4 containing 2% by weight of aluminum was formed by a sputtering method, and each of the zinc oxide layers 4 was formed by 50%.
A film having a film thickness of 0, 800, 1000, 1500Å was formed. Further, a protective layer 5 was formed on the zinc oxide layer 4. This reflectance was measured, and the result is shown in FIG. About 1000
At a wavelength of nm or more, the amount of reflection changed depending on the film thickness of the zinc oxide layer 4.

Example 2 An aluminum foil 7 having a thickness of 12 μm was used as a substrate, and a zinc oxide layer 4 containing 2% by weight of aluminum was formed by a sputtering method. The zinc oxide layer 4 was 500, 800 and 1000, respectively. 1500
A film having a thickness of Å was formed. Further, a protective layer 5 was formed on the zinc oxide layer 4. This reflectance was measured, and the result is shown in FIG. At a wavelength of about 1000 nm or more, the amount of reflection changed depending on the film thickness of the zinc oxide layer 4.

Example 3 A transparent polyester film having a thickness of 12 μm was used as the base material 2, and aluminum was vapor-deposited on the metal layer 3 by a vacuum vapor deposition method to a thickness of 800 Å. Next, a zinc oxide layer 4 containing 1.5% by weight of boron was formed by a reactive vapor deposition method.
A film having a film thickness of 0, 1000, 1500Å was formed. Further, a pattern 20 of “TOP” shown in FIG. 3 was printed on the zinc oxide layer 4 by a gravure printing method to form a protective layer 5. The reflectance of the portion where the pattern 20 is not formed was measured, and the result is shown in FIG. At a wavelength of about 1000 nm or more, the amount of reflection changed depending on the film thickness of the zinc oxide layer 4. Almost no reflection was observed in the portion where the pattern 20 was formed.

Example 4 A transparent polyester film having a thickness of 12 μm was used as the base material 2, and aluminum was vapor-deposited on the metal layer 3 to a thickness of 800 Å by a vacuum vapor deposition method. Next, the pattern 20 of "TOP" shown in FIG. 4 was formed by printing by the gravure printing method. 1. Add boron by reactive vapor deposition.
A zinc oxide layer 4 containing 5% by weight was formed, and the zinc oxide layer 4 having a film thickness of 500, 800, 1000, 1500Å was formed. Further, a protective layer 5 was formed on the zinc oxide layer 4. The reflectance of the portion where the pattern 20 is not formed was measured, and the result is shown in FIG. At a wavelength of about 1000 nm or more, the amount of reflection changed depending on the film thickness of the zinc oxide layer 4. Almost no reflection was observed in the portion where the pattern 20 was formed.

Example 5 An aluminum foil 7 having a thickness of 12 μm was used as a substrate, and a zinc oxide layer 4 containing 1.5% by weight of boron was formed by a reactive vapor deposition method.
Were formed to have film thicknesses of 500, 800, 1000 and 1500Å, respectively. Further, a “TOP” pattern 20 shown in FIG. 5 was printed on the zinc oxide layer 4 by a gravure printing method to form a protective layer 5. The reflectance of the portion where the pattern 20 is not formed was measured, and the result is shown in FIG. Zinc oxide layer 4 at wavelengths above about 1000 nm
The amount of reflection changed depending on the film thickness of. Almost no reflection was observed in the portion where the pattern 20 was formed.

Example 6 An aluminum foil 7 having a thickness of 12 μm was used as a substrate, and a “TOP” pattern 20 shown in FIG. 6 was formed by printing by a gravure printing method. Next, a zinc oxide layer 4 containing 1.5% by weight of boron was formed by a reactive vapor deposition method.
And the zinc oxide layer 4 is 500, 800, 1 respectively.
000, 1500Å film thickness was formed. Further, a protective layer 5 was formed on the zinc oxide layer 4. This pattern 20
The reflectance of the part where no slab was formed was measured, and the result is shown in FIG.
Shown in. At a wavelength of about 1000 nm or more, the amount of reflection changed depending on the film thickness of the zinc oxide layer 4. Pattern 2
Almost no reflection was observed in the portion where 0 was formed.

[0051]

EFFECT OF THE INVENTION The laminate of the present invention comprises a transparent ceramic layer laminated on a substrate or a metal foil made of zinc oxide formed by doping a metal having a valence of 3 or more or a semiconductor, and In the process where electromagnetic waves enter and are reflected by the metal layer or metal foil, the transparent ceramic layer is transparent in the visible region and exhibits absorption in the infrared region, and particularly in the wavelength region of 1000 nm or more, the dopant amount (carrier Infrared rays irradiated in this wavelength range are attenuated when they pass through the transparent ceramic layer because the absorption depends on the (concentration) and the film thickness. It is possible to determine whether or not it has. As a result, the structure has a simpler structure than that of a conventional machine-readable laminated body having an optical reading pattern such as a diffraction grating, and the authenticity determination can be easily performed, and an extremely high forgery prevention effect is exhibited. Is.

Even if the print layer is formed on the layer before or after the transparent ceramic layer, the same true / false determination can be performed by measuring the reflected light on the exposed surface.

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 showing another configuration of the laminated body of the invention.

FIG. 3 is a cross-sectional view and (b) showing an optical reading principle of a pattern of a printing layer and a transparent vapor deposition layer exposed between the patterns, showing a state in which an electromagnetic wave is radiated from above the laminate of the present invention. It is a top view.

FIG. 4 is a cross-sectional view and (b) showing an optical reading principle of a transparent vapor deposition layer provided on a pattern of a printing layer, showing a state in which electromagnetic waves are radiated from above the laminate of the present invention. It is a top view.

FIG. 5 shows a state in which electromagnetic waves are radiated from above the laminated body of FIG. 2 and shows an optical reading principle of a pattern of a printed layer and a transparent ceramic layer exposed between them (a).
It is sectional drawing and (b) top view.

6 is a cross-sectional view (a) and (b) showing an optical reading principle of a transparent ceramic layer provided on a pattern of a printed layer, showing a state in which electromagnetic waves are radiated from above the laminate of FIG. It is a top view.

FIG. 7 is a graph showing the reflectance of a transparent ceramic layer according to the laminate of the invention.

[Explanation of symbols]

 1 Laminated body 2 Base material 3 Metal layer 4 Transparent ceramic layer 5 Protective layer 6 Laminated body 7 Metal foil 8 Laminated body 9 Printing layer 10 Laminated body 11 Laminated body 12 Laminated body 20 pattern

Claims (11)

[Claims] 1. A laminated body in which a metal layer, a transparent ceramic layer, and a protective layer are sequentially laminated on a base material, wherein the transparent ceramic layer is zinc oxide doped with a metal having a valence of 3 or more or a semiconductor. A laminated body characterized by the above. 2. A laminated body in which a transparent ceramic layer and a protective layer are sequentially laminated on a metal foil, wherein the transparent ceramic layer is zinc oxide formed by doping a metal having a valence of 3 or more or a semiconductor. And a laminate. 3. The trivalent or higher valent metal or semiconductor is aluminum, boron, scandium, gallium, silicon,
The laminate according to claim 1 or 2, which is yttrium, ytterbium, indium or thallium. 4. The laminate according to claim 1, wherein the metal layer is gold, aluminum, nickel, or chromium. 5. The laminate according to claim 2, wherein the metal foil is gold, aluminum, nickel, or chromium. 6. The protective layer has a visible wavelength range of 1000 to 1000.
The laminate according to claim 1 or 2, which exhibits transparency in a wavelength region of 3000 nm. 7. A laminate according to claim 1, wherein a printed layer is provided on the transparent ceramic layer. 8. The laminate according to claim 1, wherein a printed layer is provided on the metal layer. 9. The laminate according to claim 2, wherein a printed layer is provided on the metal foil. 10. The laminate according to claim 7, wherein the printed layer absorbs electromagnetic waves in a wavelength range of 1000 to 3000 nm. 11. The laminated body according to claim 1, wherein an adhesive layer is provided on the non-laminated side of the base material.