JPH0899490A - Image indicator and thermal transfer sheet used for image formation and manufacture of image indicator - Google Patents

Abstract

PURPOSE: To obtain an image indicator allowing the individual Information on the basis of image data to be invisible from the outside by laminating an image receiving layer having an Information recording part containing an image and infrared absorbing substance on the substrate, and coating on the information recording part a concealing layer that permits infrared rays to be passed therethrough and absorbs visible rays. CONSTITUTION: The image indicator 1 includes an image receiving layer 7 having an image 3 such as a face picture, an information layer 4 and a concealing layer 5 for concealing the information layer 4 disposed on the substrate 2. The information recording layer 4 is formed of an infrared absorbing substance consisting of an infrared absorbing substance, binder resin such as vinyl acetate resin, and a mixed solvent. For such infrared absorbing substance, phosphate glass or the like is employed which is obtained by grinding infrared absorbing glass or heat absorbing glass having small absorption in the visible region. The concealing layer 5 is of the type where the information recording layer 4 is made invisible, and a substance permitting visible rays to be absorbed and infrared rays to be passed therethrough, e.g. diarylmethane dye is used therefor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of individually authenticating an image formed on the basis of image data, particularly forgery, falsification,
The present invention relates to an image display body having an information recording portion effective for alteration, a thermal transfer sheet used for forming the image, and a method for manufacturing the image display body.

[0002]

2. Description of the Related Art In recent years, there is an increasing tendency to incorporate a face photograph of the owner of a card or a portable medium as image information. Credit cards, cash cards, members cards, ID cards, etc. are generally used as cards, and passports, passbooks, etc. are used as portable media. By collating the photograph of the owner's face, the collation accuracy is remarkably improved, and there is a certain effect in preventing fraudulent behavior such as giving psychological restraint to the fraudulent user. Japanese Patent Application Laid-Open No. 6-67592 discloses a method of forming such an image on a medium such as a card.
It is disclosed in Japanese Patent Application No. 5-60408, and a method for forming the image is disclosed in Japanese Patent Application Laid-Open No. 6-106743. Further, as a means for preventing forgery of these images, as disclosed in Japanese Patent Laid-Open No. 6-183184, a hologram or an ultraviolet fluorescent layer is added to a protective sheet arranged on the image so that it is a genuine product. Was visually confirmed.

[0003]

However, the functions of the conventional holograms are visual authenticity and positioning as a design, and precise discrimination of holograms requires skill, so strict identification is difficult. Also, the card processing device does not have a function of authenticating a hologram. Furthermore, while relief holograms that have been widely used in the past are optically superior, they only provide the same picture and information, and provide individual information (serial number, unique information, ID information, etc.) for individual identification of cards and media. It could not be installed in the same place. Therefore, it is necessary to form the individual information of the card or the medium by using other information recording means, and the arrangement position and the design are restricted.

Further, the ultraviolet fluorescent layer can be easily identified by the fluorescent color, but similarly, only the same pattern and information are provided, and the ultraviolet fluorescent layer has a drawback that it has no weather resistance.

Although information that can be mechanically authenticated by an optical sensor or the like can be provided in the vicinity of the image, the presence of the information can be easily recognized by visual inspection, which may lead to forgery or alteration.

Therefore, the present invention has been made in view of the above circumstances, and in addition to forming an image based on image data,
An object of the present invention is to provide an image display body capable of simultaneously forming individual information related to the image and making the individual information invisible from the outside, a thermal transfer sheet used for forming the image, and a method for manufacturing the image display body.

[0007]

According to a first aspect of the present invention, an image display body is obtained by laminating an image receiving layer having an information recording portion containing an image and an infrared light absorbing substance formed on at least a base material. The information recording section is characterized in that a concealing layer that transmits infrared light and absorbs visible light is formed by coating.

The image display body according to the second aspect of the present invention comprises an image receiving layer having an information recording portion containing an image and an infrared light absorbing substance formed on at least a substrate, a transparent thin film reflecting layer,
It is characterized in that hologram layers are sequentially laminated, and a concealing layer that transmits infrared light and absorbs visible light is formed on the information recording portion by coating.

The second aspect of the present invention is characterized in that the transparent thin film reflective layer has a larger refractive index than the hologram layer.

Further, in the first and second aspects of the present invention, the image of the image receiving layer is formed on the information recording portion and also serves as a concealing layer which transmits infrared light and absorbs visible light. Characterize.

The thermal transfer sheet according to the third aspect of the present invention is an image receiving layer having at least a heat resistant base sheet, a release layer, an image and an information recording portion containing an image and an infrared light absorbing substance and having thermal adhesiveness. And a concealing layer that transmits infrared light and absorbs visible light is formed by coating on the information recording portion.

In the thermal transfer sheet according to the fourth aspect of the present invention, an information recording portion containing at least a heat resistant base sheet, a peeling layer, a hologram layer, a transparent thin film reflecting layer, an image and an infrared light absorbing substance is formed. A heat-adhesive image-receiving layer is sequentially laminated, and a concealing layer that transmits infrared light and absorbs visible light is formed on the information recording portion by coating.

The fourth aspect of the present invention is characterized in that the transparent thin film reflective layer has a larger refractive index than the hologram layer.

Further, in the third and fourth aspects of the present invention, the image of the image receiving layer is formed on the information recording portion and also serves as a concealing layer which transmits infrared light and absorbs visible light. Characterize.

A method of manufacturing an image display body according to a fifth aspect of the present invention is at least a heat resistant base sheet, a release layer,
In a method of manufacturing an image display body using a thermal transfer sheet which is capable of forming an image by sublimation transfer and / or thermal fusion transfer and has thermal adhesiveness to the transfer surface, an image and infrared light are applied to the image receiving layer surface. A concealing layer that transmits and absorbs visible light is formed respectively, and subsequently an information recording portion containing an infrared light absorbing substance is transferred and formed on the concealing layer. It is characterized in that each layer of the thermal transfer sheet except the heat resistant base sheet is pressure-bonded to the surface and transferred and formed.

Further, in the fifth aspect of the present invention,
The image of the image receiving layer is formed on the information recording portion, and also functions as a concealing layer that transmits infrared light and absorbs visible light.

[0017]

According to the image display member of the present invention, the visible image formed on the image receiving layer and the infrared light absorbing material covered with the concealing layer which transmits infrared light and absorbs visible light. By additionally providing the information recording layer containing the above, only the image can be visually recognized on the appearance, and the information recording layer below the concealing layer can be detected and identified by irradiation of infrared rays. Further, since the information recording layer can be provided as individual information together with the image formation, it is possible to identify each image display body. Furthermore, by stacking a hologram layer on the image display body, it is possible to reduce the space limitation due to the arrangement position on the base material and the design, and to reduce the hologram,
Even if one of the image and the information recording section is altered or tampered with, the other information is damaged, and the fact of alteration or tampering remains.

Further, according to the thermal transfer sheet of the present invention, the visible image formed on the image receiving layer and the infrared light absorbing substance as individual information are provided on the concealing layer which transmits infrared light and absorbs visible light. It is possible to create an image display body that can be provided with an information recording layer containing. Further, only the image is visually recognized on the appearance, and the information recording layer under the concealing layer is detected and identified by the irradiation of infrared rays. Further, since the information recording layer can be provided as individual information together with the formation of the image, it is possible to identify each image display body.

Further, according to the method for producing an image display of the present invention, the image, the concealing layer and the information recording layer are sublimated and / or heat-melt transferred to the image receiving layer in successive steps, and the individual information is displayed for each image display as individual information. Any different information can be formed. Furthermore, although this information recording layer is difficult to recognize in appearance, it can be detected and identified by irradiation with infrared rays.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1 is a plan view of the image display body of the present invention, FIG. 2 is a cross-sectional view of the image display body taken along line XX of FIG. 1, and FIGS. 3 and 4 are for producing the image display body of FIG. FIG. 5 is a sectional view of a thermal transfer sheet used, FIG. 5 is a conceptual diagram showing an image detected and recognized by infrared irradiation of the image display body of FIG. 1, and FIG. 6 is an image display according to a second invention of the present invention. FIG. 7 is a plan view of the body, FIG. 7 is a cross-sectional view of the image display body taken along line XX of FIG. 6, and FIGS. 8 and 9 are cross-sectional views of the thermal transfer sheet used to create the image display body of FIG. 6. Yes, in FIG.
12 is a conceptual view showing an image detected and recognized by infrared irradiation of the image display body of FIG. 6, FIG. 11 is a plan view of an image display body according to another embodiment of the second invention of the present invention, and FIG. FIG. 12 is a cross-sectional view of the image display body taken along line XX of FIG.
13 is a cross-sectional view of a thermal transfer sheet used for producing the image display body of FIG. 11, FIG. 14 is a conceptual diagram showing an image detected and recognized by infrared irradiation of the image display body of FIG. 11, and FIG. FIG. 16 is a side view showing an example of a thermal transfer ribbon used for producing the thermal transfer sheet of the present invention, and FIG. 16 is a conceptual diagram illustrating a continuous manufacturing process for manufacturing an image display body via the thermal transfer sheet of the present invention. .

As shown in FIG. 2, the image display 1 of the present invention shown in FIG. 1 has an image 3 such as a face photograph and an information recording layer 4 on a substrate 2.
Then, the image receiving layer 7 on which the concealing layer 5 covering the information recording layer 4 is arranged, the attribute information 14 related to the image 3 and the printing section 15 as common information of the image display body are formed. As shown in FIG. 4, the image 3, the information recording layer 4, and the image recording layer 7 are formed on the image receiving layer 7 by a thermal transfer ribbon or the like on the thermal transfer sheet 6 having at least the heat resistant base sheet 9, the peeling layer 8 and the image receiving layer 7 shown in FIG. A thermal transfer sheet 6'of the present invention having a concealing layer 5 is formed, and each layer other than the heat resistant base sheet 9 (image 3, information recording layer 4, concealing layer 5) is formed on the substrate 2 by thermal transfer of the thermal transfer sheet 6 '. , The image receiving layer 6, the peeling layer 8 and the like) are transferred and formed, and the image display body 1 is obtained. In addition to the image 3 to be viewed, this image display body 1 is provided with an information recording section 4 that can be mechanically read by infrared rays, and since this information is difficult to visually confirm due to the concealing layer 5, it is forged or altered. In addition, it becomes difficult and even if forgery / alteration is made, in addition to the visual authenticity determination, the genuineness / counterfeit determination is also made by mechanical reading, so it is possible to more reliably discover the fact of forgery / alteration. .

The image display 1 of FIG. 6 according to the second aspect of the invention.
As shown in FIG. 7, reference numeral 1 denotes an image 3 such as a face photograph on a substrate 2, an image receiving layer 7 in which an information recording layer 4 and a masking layer 5 covering the information recording layer 4 are arranged, a transparent thin film reflecting layer. 13, the hologram forming layer 12, the attribute information 14 related to the image 3, and the printing unit 15 as common information of the image display body are formed.
An image receiving layer as shown in FIG. 9 is formed on the thermal transfer sheet 16 having at least the heat resistant base sheet 9, the peeling layer 8, the hologram forming layer 12, the transparent thin film reflecting layer 13 and the image receiving layer 7 shown in FIG. Thermal transfer sheet 16 'of the present invention having image 3, information recording layer 4, and hiding layer 5 on 7
Of the heat transfer sheet 16 ′ is formed on the base material 2 by thermal transfer, and each layer (image 3,
The information recording layer 4, the hiding layer 5, the image receiving layer 7, the peeling layer 8 and the like) are transferred and formed, and the image display 11 is obtained. This image display body 11 has an image 3 and a hologram pattern 10 to be visually observed.
In addition, the information recording unit 4 capable of being mechanically read by infrared rays is provided, and since it is difficult to visually confirm this information by the concealing layer 5, it is difficult for the information to be counterfeited or altered, and forgery
In addition to visual authenticity judgment even if alteration is made,
Since authenticity determination is also performed by mechanical reading, it is possible to more reliably discover the fact of forgery / alteration.

The present invention can be used for portable media such as credit cards, cash cards, members cards, ID cards, etc., and passports, passbooks, etc., and various other images can be provided. And
An arbitrary image can be provided depending on the application.

Further, each configuration will be described in detail. In addition, the same numbers are used for the portions having the same configuration in the respective drawings relating to the image display body and the thermal transfer sheet of the present invention. First, the base material 2 includes, for example, polyvinyl chloride resin, paper material, polyethylene terephthalate resin, acrylic resin, polycarbonate resin, ABS resin, and the like. Particularly, the base material surface that reflects light in the infrared wavelength region is used. preferable. White color is especially desirable.

The image receiving layer 7 is provided on the thermal transfer sheet 6,
After the image 3, the information recording layer 4, and the concealing layer 5 are formed to form the thermal transfer sheet 6 ′, the thermal transfer sheet 6 is transferred to the substrate 2, and the image receiving layer 7 of the thermal transfer sheet 6 ′ is the image 3 / information. The surface on which the recording layer 4 and the hiding layer 5 are formed is heat-bonded to the base material 2. It is preferable that the image receiving layer 7 can stably transfer and form the image 3, the information recording layer 4, and the concealing layer 5 and has good thermal adhesiveness to the substrate 2. Details are disclosed in the following thermal transfer sheet.

Next, the image 3 consists of a sublimation transfer material of yellow, magenta and cyan and / or a black heat-melting transfer material (wax type transfer material) for visual information such as a face photograph,
Usually, it is optionally formed from these transfer materials formed into a thermal transfer ribbon. As described in, for example, JP-A-3-79384 and the like, a sublimable transfer material is a material that enters a sublimation or melting transition state by heat and penetrates into the image receiving layer. For example, a binder and a dye are main components, and a binder is used as a binder. A resin containing a cross-linked product of polyvinyl alcohol such as polyvinyl acetal and polyvinyl butyral as a main component is mentioned, and the dye is a diarylmethane-based, triarylmethane-based, thiazole-based, methine-based, azomethane-based, xanthene-based, axazine-based, thiazine System, azine system, acridine system, azo system, spirodipyran system, isodolinospiropyran system, fluorane system, rhodamine dactam system, anthraquinone system and the like. The heat-meltable transfer material is a material that is melted by heat and fused to the image receiving layer, and includes, for example, a wax layer and a heat transfer layer. As waxes, plant waxes such as candelilla wax, carnauba wax, rice wax and wood wax, animal waxes such as beeswax, lanolin and whale wax, petroleum waxes such as montan wax and petrolatane, and synthetic waxes such as polyethylene wax. Synthetic hydrocarbons such as waxes, modified waxes such as montan wax derivatives, hydrogenated waxes such as hydrogenated castor oil, lauric acid, valmitic acid, myristic acid,
There are fatty acids such as stearic acid and waxes such as fatty acid amides, fatty acid anilides and imido waxes, and the resins include acrylics, styrenes, rosins, vinyls, acetals and rubbers.

The hot melt transfer material is, for example, saturated polyester resin, polyvinyl chloride, polyvinyl chloride resin such as polyvinyl chloride-vinyl acetate, polymethyl acrylate,
Poly (2-naphthyl) acrylate, poly (methyl methacrylate), poly (ethyl methacrylate), poly (methacrylic acid) -t-
Butyl, polyphenylmethacrylate, copolymer of methylmethacrylate and alkylmethacrylate (however, the alkyl group has 2 to 6 carbon atoms) polymethylchloroacrylate, acrylic resin such as acryl-styrene copolymer, polystyrene, polydivinyl Resins of vinyl resins such as benzene, polyvinyltoluene, styrene-butadiene copolymer, and titanium oxide, calcium carbonate, Hansa yellow, oil emery 2G, oil black, pyrazolone orange, oil red, red iron oxide, anthraquinone violet, phthalocyanine blue as colorants. , Aluminum powder, bronze powder, pearl essence, magnetic powder, carbon black and the like.

The information recording layer 4 includes, for example, an infrared absorbing material, a binder resin such as vinyl acetate vinyl chloride resin, saturated polyester and polyurethane elastomer, and toluene,
Methyl isobutyl ketone, xylene, cyclohexanol, isobutyl acetate, cyclohexanone, methyl cyclohexanone, a glycol derivative such as ethylene glycol monobutyl ether, etc., or an infrared absorbing ink having a mixed solvent as a main component, and by this action infrared absorption and The recorded information is read by the contrast with the reflection of infrared rays from the underlying substrate or the like. Such infrared absorbing substances are organic / inorganic pigments, dyes, etc. that absorb in the infrared wavelength region. As an example, cyanine type, naphthoquinone type, anthraquinone type, triphenylmethane type,
Phthalocyanine type, pyrylium type, squarylium type,
Examples thereof include aluminum-based dyes, dithiol metal complex salts, diimmonium-based dyes, and inorganic pigments such as carbon black. Since these inorganic pigments have absorption in the visible light region, in order to completely conceal the provided information, it is necessary to further absorb visible light, that is, a black or dark color concealing layer.

Further, as the infrared absorbing material, there are glass-based materials such as phosphate glass and sulfuric acid glass which are required by crushing infrared absorbing glass or heat absorbing glass having a small absorption in the visible region and making it into a pigment. For example Fe ²⁺ and / or Cu ²⁺
A glass-based powder material containing Specifically, phosphorus pentoxide (P ₂ O ₅ ) is the main component, and iron oxide and /
Alternatively, it is a powder material containing 1.0% by weight or more of copper oxide, preferably 35.0 to 80.0% by weight of phosphorus pentoxide, and 0 to 3.0% of iron oxide and copper oxide, respectively.

Further, a phosphate-based white crystal powder can be mentioned.
It Specifically Fe²⁺And / or Cu ²⁺20% by weight or less
Including phosphorus pentoxide (P₂O_Five) -Based crystal powder
And preferably 40 to 7% by weight of phosphorus pentoxide.
0%, Fe²⁺And / or Cu²⁺30-70% each
It is a crystal powder containing. For these phosphate-based compositions
It is melted and crystallized to form a phosphate-based white crystal
Is obtained and powdered. Further moth
Lath-based powder material and phosphate-based white crystalline powder are not required.
However, the following compounds may be contained. Al2O3 2.0-10.0% by weight B2O3 1.0-30.0% by weight MgO 3.0-10.0% by weight ZnO 0-3.0% by weight K2O 0-15.0% by weight BaO 0-10 0.0 wt% SrO 0-1.0 wt% Ni, Co, Se Trace amount

Further, white crystalline materials such as sulfate white crystalline powder, a white reaction product of tungsten hexachloride and phosphoric acid ester and / or phosphorous acid, and the like can be mentioned. Since these have little absorption in the visible light region and have a white or light coloring, the hiding layer for hiding it need not be black. Therefore, the color of the hiding layer and the image forming pattern are not limited, and it is possible to give a decorative effect to the image display surface. Furthermore, because of its excellent infrared absorption ability, it is possible to reduce the mixing ratio of the infrared absorbing substance dispersed in the infrared absorbing ink that constitutes the information recording section, and it is difficult to visually check the information recording section when the base material is white. It also has the advantage of

The information recording layer 4 is formed by using the above infrared absorbing ink, for example, a bar code, a two-dimensional code, a character,
Arbitrary patterns such as numbers and figures can be provided by known transfer means such as sublimation transfer and thermal transfer, or known printing means such as screen printing, offset printing and gravure printing.

The hiding layer 5 makes the information recording layer 4 invisible, and is a substance that absorbs visible light and transmits infrared light,
For example, diarylmethane type, triarylmethane type, thiazole type, methine type, azomethane type, xanthene type,
Axazine, thiazine, azine, acridine,
Azo dyes, spirodipyran dyes, isodolinospiropyran dyes, fluorane dyes, rhodamine dactam dyes, anthraquinone dyes, and the like can be used. These substances are mixed with a binder of polyester resin, vinyl acetal resin, cellulose resin, acrylic resin, polyamide resin, and the known transfer method such as sublimation transfer, thermal transfer, or gravure coating, roll coating, blade coating, etc. It is provided by known coating means or known printing means such as screen printing, offset printing, gravure printing and the like.

Further, the thermal transfer sheet 8 on which the image 3, the information recording layer 4, and the masking layer 5 of the image display 1 are once formed.
As shown in FIG. 3, a heat-resistant base sheet 9 as a support is provided with a release layer 8 and an image receiving layer 7 in this order. The heat-resistant base sheet 9 is a heat-resistant sheet that is not softened and deformed by heat and pressure during thermal transfer, and examples thereof include a biaxially stretched polyethylene terephthalate film, a polyethylene naphthalate film, and a polycarbonate.

The peeling layer 8 peels together with the image receiving layer 7 from the heat resistant base sheet 9 when it is transferred to the substrate 2 of the image display body 1. In addition to having peeling property, the peeling layer 8 is exposed to the outside in the image display body 1. Therefore, it is necessary that the image receiving layer 7 or the like which is the inner layer has a function of protecting from chemical damage or mechanical damage due to permeation of chemicals / solvents, etc. A mixture of a plastic resin and an anti-friction agent is used.

The thermoplastic resin prevents penetration of chemicals such as plasticizers, acids, alkalis, alcohols and kerosene, and
It suppresses the occurrence of scratches due to scratches. For example,
Examples include polymethylmethacrylate, epoxy resin, and nitrocellulose. These polymethylmethacrylate and epoxy resins have excellent plasticizer resistance among existing thermoplastic resins, and are substances that are easily peeled off from the heat resistant base sheet 9. The plasticizer is contained in a soft vinyl sheet, a plastic eraser, etc., and when it comes into contact with the plasticizer, the plasticizer migrates to the image surface, causing discoloration of the image and the like.

The anti-friction agent improves abrasion resistance and scratch resistance. For example, Teflon powder; polyethylene powder; animal wax, plant wax,
Natural wax such as mineral wax and petroleum wax; synthetic hydrocarbon wax, aliphatic alcohol wax and acid wax, aliphatic ester wax and glycerite wax, hydrogenated wax, synthetic ketone wax, amine and amide Examples thereof include synthetic waxes such as waxes, chlorinated hydrocarbon waxes, synthetic animal wax waxes and α-olein waxes; metal salts of higher fatty acids such as zinc stearate.

The mixing ratio of the above-mentioned thermoplastic resin and anti-friction agent is 85 to 95 with respect to 100 parts by weight of the thermoplastic resin.
The range of 5 to 15 parts by weight of the anti-friction agent is preferable.
The coating amount of the peeling layer 8 is preferably about 1 to 3 g / m ² .

Further, the release layer 8 may be blended with a release improving agent such as a linear saturated polyester resin in order to improve the cuttability of the transfer portion from the thermal transfer sheet during thermal transfer. The mixing ratio is preferably about 0 to 3 parts by weight with respect to 100 parts by weight. It should be noted that it is desirable not to add other additives such as an ultraviolet absorber to the release layer. Addition of these reduces the chemical resistance and causes chemicals such as plasticizers.
This may cause penetration of solvents and the like, and may also cause deterioration of mechanical strength.

The peeling layer 8 is formed by coating the composition constituting the peeling layer with a suitable solvent and subjecting it to gravure coating,
The heat-resistant base sheet 9 is formed by applying and drying the heat-resistant base sheet 9 using a known application means such as roll coating or bar coating.

The image receiving layer 7 is formed by forming the image 3 by means of a thermal transfer means using a thermal transfer ribbon 17 which is a sublimable or thermofusible transfer material, and is further thermally adhered to the base material 2 of the image display body 1. The image receiving layer 7 on which the image 3 is formed constitutes a part of the image display 1. That is, the image receiving layer 7 is made of a thermoplastic resin capable of forming an image made of a sublimable or heat-meltable transfer material or the like by a thermal transfer means and having thermal adhesiveness to the base material 2.

If the thermoplastic resin has a low thermal melting temperature, a part of the thermoplastic resin of the image receiving layer 7 may be thermally fused (transferred) to the thermal transfer ribbon 17. It is conceivable to use a thermoplastic resin having a high temperature, but the temperature setting of heating means such as a heat roll or a heat plate in the heat transfer step of transferring the image receiving layer 7 of the heat transfer sheet 6 on which the image 3 is formed to the base material 2. Needs to be set high. However, the image 3 consisting of sublimable dyes etc. due to high temperature
There is a problem that deterioration (discoloration) and heat damage to the base material 2 occur. Further, in order to prevent the thermal transfer ribbon 17 from adhering the image receiving layer 7 in order to prevent thermal fusion of the image receiving layer 7, an additive such as silicon may be mixed into the image receiving layer 7. There is a problem that the adhesiveness to the material 2 deteriorates. Therefore, the problem was solved by setting the glass transition point of this thermoplastic resin to 50 ° C. or higher and adding a filler to form the image receiving layer 7.

The thermoplastic resin used for the image receiving layer 7 preferably has a glass transition point (Tg) of 50 ° C. or higher and 130 ° C. or lower. In the case of a thermoplastic resin having a glass transition point (Tg) of less than 50 ° C., after the transfer to the substrate 2, the thermoplastic resin causes migration of the dye, and thus the image 3
In the case of a thermoplastic resin in which bleeding occurs and the glass transition point is 130 ° C. or higher, the image receiving layer 7 is heated by the above-mentioned heating means.
It is necessary to heat the substrate 2 to a base material 2 at a high temperature, and the base material 2 such as a card may be deformed by heat.

Examples of such a thermoplastic resin include polyester such as linear saturated polyester, vinyl chloride resin such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer resin, polyacrylic acid, polyacrylic acid-2. -Methoxyethyl, poly (methyl acrylate), poly (acrysan-2-naphthyl), poly (isobornyl acrylate), poly (methacrylomethyl), poly (acrylonitrile), poly (methyl chloroacrylate), poly (methyl methacrylate), poly (ethyl methacrylate), poly (meth) acrylic acid-tert. -Acrylic resins such as butyl, polybutyl isobutyl methacrylate, polyphenyl methacrylate, copolymer resins of methyl methacrylate and alkyl methacrylate (provided that the alkyl group has 2 to 6 carbon atoms), polystyrene, polydivinylbenzene, polyvinyl Benz , Styrene - butadiene copolymer resin, styrene-alkyl methacrylate (carbon number of wherein the alkyl group is 2-6) include vinyl resins such as.

Further, when the image 3 is formed by the thermal head using the thermal transfer ribbon 17 on the surface of the image receiving layer 7, the main component of the image receiving layer 7 is the thermoplastic resin. Is fused to the dye layer of the thermal transfer ribbon 17 to make the image 3 unclear,
A filler having an anti-blocking property in the thermoplastic resin to prevent heat fusion, particularly an inorganic or organic filler having a heat melting temperature (softening point or decomposition point in the case of an organic filler, melting point in the case of an inorganic filler) of 200 ° C. or higher. Added.

Examples of such organic fillers include polytetrafluoroethylene fine particles, starch, silicone resin fine particles, polyacrylonitrile-based fine particles, cured resin fine particles made of benzognamine resin and melamine resin. Examples of the non-8 filler include calcium carbonate, talc, kaolin, zinc oxide, titanium oxide, silicon oxide, aluminum hydroxide, and magnesium oxide.

The mixing ratio of the thermoplastic resin and the filler may be in the range of 1 to 200 parts by weight of the filler with respect to 100 parts by weight of the thermoplastic resin. The method of applying the image-receiving layer 7 is to first form the image-receiving layer composition into a coating material with a suitable solvent, and then apply and dry this coating material using a known coating means such as gravure coating, roll coating, bar coating. . Coating amount is 1
It is about 3 g / m ² .

Further, in order to prevent the discoloration of the dye constituting the image 3 due to the light, the maximum absorption wavelength of 250 to 250 is contained in the image receiving layer.
You may add a 400 nm ultraviolet absorber. Examples of such an ultraviolet absorber include phenyl salicylate, p-tert-butylphenyl salicylate, p-
Salicylic acid-based UV absorbers such as octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy- 4-methoxybenzophenone, 2,2'-dihydroxy-4,
4'-dimethoxybenzophenone, 2-hydroxy-4
Benzophenone-based UV absorbers such as -methoxy-5-sulfobenzophenone, 2- (2'-hydroxy-5'-
Methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert.
-Butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-ditert
-Butylphenyl) -5-chlorobenzotriazole,
Benzotriazole-based UV absorbers such as 2- (2'-hydroxy-3 ', 5'-ditert-amylphenyl) benzotriazole, 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate, ethyl-2. Examples include cyanoacrylate-based ultraviolet absorbers such as -cyano-3,3-diphenylacrylate. The mixing ratio of the ultraviolet absorber may be in the range of 5 to 40 parts by weight with respect to 100 parts by weight of the mixture of the thermoplastic resin and the filler.

Further, the hologram forming layer 12 constituting the image display body 11 of the second invention is a surface relief type hologram composed of an uneven hologram pattern 10, and further a transparent thin film reflecting layer 13 is provided. It is preferable to use a two-component reaction type urethane resin for the hologram forming layer 12, because the embossing moldability is good, uneven press is less likely to occur and a bright reproduced image is obtained, and the adhesiveness with the transparent thin film layer is also good. It has the characteristic that

Such a two-component reaction type urethane resin is a prepolymer having an isocyanate group and a polyol component such as polyether polyol, polyester polyol, acrylic polyol, etc., in view of various physical properties such as solvent resistance, heat resistance and processability. A polyol-curable urethane resin consisting of and is suitable. Among them, the polyol component has a glass transition point of 7
An acrylic polyol resin having an OH group in the range of 0 to 105 ° C. and an OH group in the range of 50 to 150 has good coating suitability, and embossing moldability required for a thermal transfer sheet and releasability from a heat resistant base sheet. A very good thermal transfer sheet can be obtained. As the isocyanate component,
Toluene diisocyanate (TDI), xylene diisocyanate (XDI), hexamethylene isocyanate (HMDI) and the like can be used.

Further, as a modifier for improving coating suitability and transferability, a cellulose resin such as nitrocellulose, acetylcellulose, cellulose acetate butyrate, cellulose acetate propionate, ethyl cellulose, and methyl cellulose is used as a two-component reactive urethane resin. Up to 30% by weight can be added. In order to coat such a hologram forming layer 12, a paint resin is applied onto the heat resistant base sheet 9 of the thermal transfer sheet 16 shown in FIG. 8 by a method such as roll coating or blade coating.
It can be formed by drying, and its film thickness is 0.5 to 5 μ.
It is set to about m.

The hologram-forming layer 12 formed in this manner is appropriately bonded to the heat-resistant base sheet 9 coated with the release layer 8 and has excellent moldability by heating and pressing during embossing. It also has no adhesiveness to the surface relief hologram stamper whose surface is plated with nickel, gold, chrome, etc., and has good adhesiveness to the transparent thin film reflective layer 13, and when transferred to a substrate. The required film cutting performance is also good. In addition to the surface relief hologram described above, a Lippmann hologram, a grating hologram, or the like can be used as the hologram, and their configurations can be appropriately changed according to the hologram used.

Next, the transparent thin film reflecting layer 13 formed on the hologram forming layer 12 of the thermal transfer sheet 16 shown in FIG.
The hologram forming layer 12 has a higher refractive index and a higher transmittance in the visible light region. If the transparent thin-film reflective layer 13 having a high refractive index is provided along the uneven surface of the hologram forming layer 12, the transparent thin-film layer within the reproducible angle range of the hologram image is formed in the reproducible angle range of the hologram image due to the angle dependence of the reproduction which is a characteristic of the hologram. While it has the maximum light reflectance and functions as a "reflection hologram," it functions as a transparent body outside the reproducible angle range of the hologram image.
The image 3 on the base material 2 side can be seen through.

Examples of the material forming the transparent thin film reflective layer 13 include the inorganic materials shown in Table 1 below.

[0055]

[Table 1]

As the method for forming the transparent thin film reflective layer 13, known film forming means such as vacuum vapor deposition method, sputtering method and ion plating method can be used.
A range of 00 to 10000Å is suitable.

Further, in order to improve the adhesiveness between the image receiving layer 7 and the transparent thin film reflective layer 13, a primer layer may be provided between them. A urethane resin is suitable as such a material, and specifically, a urethane resin comprising a polyol ion component such as a polyurethane ionomer resin, a polyether polyol, a polyester polyol, and an acrylic polyol, and a prepolymer having an isocyanate group is used. .

The image 3, the information recording layer 4, and the concealing layer 5 which are once formed on the thermal transfer sheets 6 and 16 are preferably formed by transfer means as shown in FIGS. 4 and 9, respectively. In this transfer means, for example, as shown in FIG. 15, a thermal transfer ribbon in which a transfer ink layer for forming an image 3, an information recording layer 4 and a hiding layer 5 is provided adjacent to each other on one heat resistant support film 18. It is possible to transfer and form on the thermal transfer sheets 6 and 16 by 17 or a thermal transfer ribbon (not shown) formed separately. Each layer other than the heat resistant base sheet 9 is thermally transferred from the thermal transfer sheets 6 and 16 shown in FIGS. 4 and 9 to the substrate 2 (image 3, information recording layer 4, hiding layer 5, image receiving layer 7, release layer 8 and the like). )
Is transferred and formed, and the image display body 1 of FIG. 2 is obtained.

5 and 10 show image information detected and recognized by irradiation of infrared rays (not shown) on the image display body 1. The information recording layer 4 is hidden by the hiding layer 5 and made invisible. Can recognize the contents of. Next, a method for manufacturing the image display body of the present invention will be described. FIG. 17 shows a continuous manufacturing process for manufacturing an image display through the thermal transfer sheet of the present invention. At least the heat-resistant base sheet 9, the release layer 8 shown in FIG. The long thermal transfer sheet 6 including the image receiving layer 7 (including the hologram forming layer 12 and the transparent thin film reflective layer 13 as shown in FIG. 8 in the second invention) is sent out, and the thermal transfer sheet 6 is sent in the first thermal transfer step. The image 3, the information recording layer 4, and the concealing layer 5 are formed on the upper surface (see FIG.
As shown in FIG. 1, the hologram forming layer 12 and the transparent thin film reflecting layer 1
3) is further formed, and the image forming surface of the thermal transfer sheet 6 ′ is brought into contact with the base material 2 in the second thermal transfer step, and as shown in FIG. Each of the recording layer 4, the image receiving layer 7 on which the masking layer 5 is formed, and the peeling layer 8 (including the hologram forming layer 12 and the transparent thin film reflecting layer 13 as shown in FIG. 9 in the second invention) are used as the base material 2 The thermal transfer sheet 6'is formed by thermal transfer on the upper side, and the thermal transfer sheet 6'after the thermal transfer is wound up by the winding roll f.

The thermal transfer ribbon 17 is provided with a transfer material for transferring and forming the image 3, the information recording layer 4 and the hiding layer 5 on the thermal transfer sheet 6. In this thermal transfer ribbon 17, for example, as shown in FIG. 15, each transfer material (image, information recording layer, concealing layer) is adjacent to a support member according to a portion constituting the image display member, and one image display member is formed. Each transfer material necessary for forming is provided as one unit, and further this unit is provided continuously. Note that each of the transfer materials may be a separate thermal transfer ribbon, and in that case, a transfer means is required for each thermal transfer ribbon in order to perform a continuous process.

Each thermal transfer process will be described below. In the first thermal transfer process, the thermal transfer sheet 6 arranged on the transfer drum a is brought into contact with the thermal head b which heats the thermal transfer ribbon 17 to a predetermined transferable temperature, and the thermal head b is transferred to form image data. Accordingly, heat is generated to form the predetermined image 3, the hiding layer 5, the information recording layer 4 and the like on the thermal transfer sheet 6. Reference numeral c is a guide roll for guiding the thermal transfer ribbon 17 and the thermal transfer sheet 6.

In the second thermal transfer step, the thermal transfer sheet 6'on which the image 3, the information recording layer 4, the hiding layer 5 and the like are formed.
Is contacted with a heat roll d that generates heat to a predetermined transferable temperature, the heat roll d is caused to generate heat, and the above layers are formed on the base material 2
Thermal transfer formed on top.

According to the present invention, since the information medium having different image information is easily manufactured by transferring and forming in two steps as described above, the information is formed at one time.
It is easy to find tampering and alteration marks.

Hereinafter, further specific examples of the present invention will be described. <Example 1> The thermal transfer sheet 6 of Example 1 is a heat resistant base sheet 9 made of a biaxially stretched polyethylene terephthalate film having a thickness of 25 µm as shown in Fig. 3.
The peeling layer 8 and the image receiving layer 7 are formed on. Each layer will be described in detail below.

[Thermal Transfer Sheet] (Release Layer Paint) Acrylic Resin 25 parts Toluene 40 parts Methylethylketone 20 parts Methylisobutylketone 15 parts (Receptor / adhesive layer paint) Polyester resin 25 parts Vinyl chloride-vinyl acetate copolymer resin 5 parts Methylethylketone 40 Part Toluene 30 parts On the heat resistant base sheet 9 made of a polyethylene terephthalate film having a thickness of 25 μm biaxially stretched, the release layer coating material was dried at a drying temperature of 110 using a gravure coater.
The release layer 8 was formed by applying the coating at 1.5 ° C. and a coating thickness of 1.5 μm.
The image-receiving layer coating composition was applied onto the image-receiving layer coating material using a gravure coater at a drying temperature of 110 ° C. and a coating thickness of 2.0 μm.
Was formed to obtain the thermal transfer sheet 6 shown in FIG.

[Thermal Transfer Ribbon] The thermal transfer ribbon 17 is provided for providing the concealing layer 5 and the information recording layer 4 on the thermal transfer sheet 6, and as shown in FIG.
The information recording / transferring section 20 is composed of two parts. In this embodiment, the hiding layer transfer portion 19 is used for image formation and hiding layer formation.

The ink constituting each part will be specifically described below. (Hiding layer transfer part) 19 ... (Visible light absorption, infrared light transmission) Yellow 19a HSY-62 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts 2. Magenta 19b HSY-31 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts 3. Cyan 19c HSY-42 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts (information recording layer transfer part [black]) 20a ... (visible light absorption, infrared light absorption) Methacrylic acid ester 20 parts Vinyl chloride vinyl acetate copolymer 6 parts Carbon black 4 parts MEK 70 parts The above four color inks were placed on a heat-resistant support film 9 having a thickness of 6 μm and a gravure coater as shown in FIG. A thermal transfer ribbon 17 composed of four colors was manufactured by applying and drying so that each color was alternately arranged.

Then, the thermal transfer sheet 6 and the thermal transfer ribbon 17 are set in the image forming apparatus 22 shown in FIG.
A heating element group (not shown) of the thermal head b is caused to generate heat based on image data (for example, a facial photograph), and is transferred to the image receiving layer 7 of the thermal transfer sheet 6 from the three color dyes of the concealed transfer portion 19 (yellow, magenta, cyan). A multi-color image 3 is formed, and a concealing layer 5 for concealing information is formed by using a mixture of the above three colors, and the transfer ribbon portion of the information recording layer transfer portion [black] 20a is further formed on the cover layer 5 portion. Was used to form an information recording portion 4 (characters of TOP), and a thermal transfer sheet 6 ′ shown in FIG. 4 was produced.

Next, the image receiving layer 7 of the thermal transfer sheet 6'is brought into contact with the white base material 2 made of polyvinyl chloride, and pressure / heating (heating) is performed from the side of the thermal transfer sheet 6'by heating means (heat roll d). (Temperature: 150 ° C.), the image-receiving layer 7 is pressure-bonded to the base material 2, and the heat-resistant base film 9 is peeled off from the thermal transfer sheet 6 ′ to form the image 3, the information recording layer 4, and the hiding layer 5 as shown in FIG. An image display body 1 having

When the image display 1 is visually observed, as shown in FIG. 1, the image 3 of the face photograph and the hiding layer 5 can be confirmed, but the information recording layer 4 is black, and the black hiding layer 5 makes it difficult to read. Is.

For this image display body 1, 750 nm, 78
When a semiconductor laser beam of 0 nm, 810 nm, 830 nm, 905 nm, etc. is irradiated, these laser beams are absorbed by the cupric-containing phosphate-based white crystalline compound which is the infrared absorbing substance of the information recording section 4, As shown in (1), the characters "TOP" can be read as a pattern due to the difference in contrast due to the transmission of infrared rays and the absorption of infrared rays. For example, when a monochrome monitor is used for this, the portion where infrared rays are reflected shows white and the portion where infrared rays are absorbed shows black.

<Example 2> The thermal transfer sheet 16 of Example 2 was biaxially stretched as shown in FIG.
A heat-resistant base sheet 9 made of a polyethylene terephthalate film, a peeling layer 2, a hologram forming layer 12 having an uneven hologram pattern 10 forming a relief hologram, and a material having a refractive index higher than that of the hologram forming layer 12. The transparent thin film reflective layer 13 made of (ZnS) and the image receiving layer 7 form a main part thereof. Each layer will be described in detail below. The description of the same components as those in the first embodiment will be omitted.

[Thermal Transfer Sheet] (Hologram Forming Layer Coating Material) Mixture of vinyl chloride-vinyl acetate copolymer resin and urethane resin 25 parts Methyl ethyl ketone 50 parts Toluene 25 parts Heat resistance consisting of biaxially stretched 25 μm thick polyethylene terephthalate film A release layer coating material similar to that used in Example 1 was applied onto the base film 9 using a gravure coater at a drying temperature of 110 ° C. and a coating thickness of 1.5 μm.
Was formed. A hologram forming layer 12 is formed on the peeling layer 8 by applying a hologram forming layer coating material at a drying temperature of 110 ° C. and a coating thickness of 2.0 μm using a gravure coater to form a hologram forming layer 12, and a hologram pattern is formed on the hologram forming layer 12. The hologram pattern forming surfaces of the stamper (not shown) are overlapped, and embossing (embossing press) processing is performed under the heating condition of 160 ° C. by the press machine to form the hologram pattern 10 (concave pattern, wavy line) on the hologram forming surface. did.

Next, ZnS having a thickness of about 800 Å is formed on the hologram forming layer 12 provided with the hologram pattern 10.
Is vacuum-deposited to form a transparent thin film reflective layer 13, and the same image-receiving layer coating material as in Example 1 is dried on the transparent thin film reflective layer 13 using a gravure coater at a drying temperature of 110 ° C. and a coating thickness of 2.0 μ.
m to form the image receiving layer 7, and a thermal transfer sheet 16 as shown in FIG. 8 was produced.

The thermal transfer sheet 16 and the thermal transfer ribbon 15 similar to that of the first embodiment are set in the image forming apparatus shown in FIG. 16, and the heating element group of the thermal head b is subjected to image data (for example, a facial photograph) as in the first embodiment. ) To form a multicolored image 3 on the image receiving layer 7 of the thermal transfer sheet 16, and at the same time, the hiding layer 5 and the information recording layer 4 (the letters TOP) hidden by the hiding layer 5 are formed. A thermal transfer sheet 16 ′ shown in 9 was produced.

Next, as in Example 1, the image receiving layer 7 of the thermal transfer sheet 16 'was brought into contact with the white base material 2 made of polyvinyl chloride, and pressure was applied from the thermal transfer sheet side by heating means (heat roll d). While heating (heating temperature: 150 ° C.) to press-bond the image receiving layer 7 to the base material 2, the thermal transfer sheet 1
The heat resistant base film 9 was peeled off from 6'to prepare an image display 11 having a hologram pattern 10, an image 3, an information recording layer 4 and a masking layer 5 as shown in FIG.

When the image display body 11 is visually observed, as shown in FIG. 6, the hologram pattern 10 and the face photograph image 3,
Although the hiding layer 5 can be seen, the information recording layer 4 is black,
The black hiding layer 5 makes it difficult to read.

For this image display body 11, as in Example 1, 750 nm, 780 nm, 810 nm, 830 nm,
When a semiconductor laser beam of 905 nm or the like is irradiated, these laser beams are absorbed by the cupric-containing phosphate-based white crystal compound of the information recording layer 4, so that infrared transmission and infrared absorption as shown in FIG. The characters "TOP" can be read as a pattern due to the difference in contrast due to. For example, when a monochrome monitor is used for this, the portion where infrared rays are reflected shows white and the portion where infrared rays are absorbed shows black.

<Embodiment 3> In this embodiment, the image 23 and the information recording layer 4 are similarly provided on the thermal transfer sheet 16 of Embodiment 2 shown in FIG. 8 by using the thermal transfer ribbon 17. The thermal transfer ribbon 17 includes a hiding layer transfer section 19 and an information recording transfer section 2.
It consists of two parts, 0. Further, as the infrared absorbing substance contained in the information recording layer 4, a white cupric acid-containing phosphate white crystallized product was used. Each layer will be described in detail below. In addition,
Description of the same parts as those in the first and second embodiments will be omitted. [Thermal Transfer Ribbon] (Hiding Layer Transfer Part) 19 ... (Visible Light Absorption, Infrared Light Transmission) Yellow 19a HSY-62 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts 2. Magenta 19b HSY-31 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts 3. Cyan 19c HSY-42 Mitsubishi Kasei 3 parts BX-1 Sekisui Chemical Co., Ltd. 4 parts Toluene / MEK 93 parts (information recording layer transfer part [white]) 20b ... (visible light absorption, infrared light absorption) cupric containing phosphate white crystalline compound 4 parts 6 parts of methacrylic acid ester 20 parts vinyl chloride-vinyl acetate copolymer of (P ₂ O _5, CuO, melt crystallized ZnO) MEK 70 parts the above four colors of ink, Using a gravure coater, the heat-resistant support film 18 was coated on a polyester film having a thickness of 6 μm so that each color was alternately arranged and dried to prepare a thermal transfer ribbon 17 composed of four colors.

The thermal transfer ribbon 17 and the second embodiment
17 is set in the image forming apparatus shown in FIG. 17, and the heating element group of the thermal head is made to generate heat based on the image data (for example, a facial photograph) in the same manner as in Example 1 to form the image receiving layer 7 of the thermal transfer sheet 16. An image 23 also serving as a masking layer for masking the information recording layer 4 was formed, and the information recording layer 4 (characters of TOP) hidden by the image 23 was formed to prepare a thermal transfer sheet 16 ″ shown in FIG.

Next, as in Example 1, the image receiving layer 7 of the thermal transfer sheet 16 "was formed on the white base material 2 made of polyvinyl chloride.
And the image receiving layer 7 is pressed against the base material 2 by pressurizing and heating (heating temperature: 150 ° C.) from the side of the thermal transfer sheet by a heating means (heat roll d), and at the same time, the thermal transfer sheet 1
The heat-resistant base film 9 was peeled off from 6 ″ to prepare an image display body 21 having a hologram pattern 10, an image 23 and an information recording layer 4 as shown in FIG.

When visually observing this image display body 21, FIG.
As shown, the image 23 including the hologram pattern 10 and the facial photograph can be confirmed, but the information recording layer 4 is hidden by the image 23 and is difficult to read.

For this image display body 21, 750 nm, 780 nm, 810 nm, 830 nm,
When a semiconductor laser beam of 905 nm or the like is irradiated, these laser beams are absorbed by the cupric-containing phosphate-based white crystalline compound of the information recording layer 4, so that the infrared ray is transmitted and the infrared ray is absorbed as shown in FIG. The character "TOP" can be read as a pattern due to the difference in contrast. For example, when a monochrome monitor is used for this, the portion where infrared rays are reflected shows white and the portion where infrared rays are absorbed shows black. Since the information recording layer 4 thus concealed does not affect the reading with white and visible light, it is possible to form the image 23 which also serves as a concealment layer on the upper surface of the information recording layer 4.

[0084]

According to the image display of the present invention, the visible image formed on the image receiving layer and the infrared light absorption covered with the concealing layer which transmits infrared light and absorbs visible light. By installing the information recording layer containing the substance, only the image and the hiding layer can be visually recognized from the outside, but since the information recording layer under the hiding layer is read by the irradiation of infrared rays, the authenticity can be determined. You can surely discover the fact of alteration or falsification. Further, by individually providing the information recording layer together with the formation of the image, it is possible to identify each image display body. Furthermore, by stacking a hologram layer on the image display body, it is possible to reduce the space limitation due to the arrangement position on the substrate and the design.
Even if one of the image and the information recording section is altered or tampered with, the other information is damaged, and the fact of alteration or tampering remains.

The infrared absorbing substance used in the information recording layer is white or lightly colored, and the base material of the image display is made of a white material so that the concealing layer has a color or pattern other than solid. This makes it possible to make it difficult to visually check the information recording layer without impairing the decorative effect of the image display body and surely prevent forgery / alteration.

Furthermore, according to the method for producing an image display of the present invention, the image, the hiding layer and the information recording layer can be formed at once by sublimation transfer or thermal fusion transfer in a continuous series of steps. The image display is easy to manufacture.

Further, according to this manufacturing method, the hiding layer and the information recording layer are formed for each image display body by sublimation transfer or thermal fusion transfer, so that it is easy to record different information on each image display body. In addition, it is possible to provide an image display body that is difficult to counterfeit, alter, and falsify.

[Brief description of drawings]

FIG. 1 is a plan view of an image display body of the present invention.

FIG. 2 is a cross-sectional view of the image display body taken along line XX of FIG.

FIG. 3 is a cross-sectional view of a thermal transfer sheet used to create the image display body of FIG.

FIG. 4 is a cross-sectional view of a thermal transfer sheet used to create the image display body of FIG.

FIG. 5 is a conceptual diagram showing an image detected and recognized by infrared irradiation of the image display body of FIG.

FIG. 6 is a plan view of an image display body according to a second invention of the present invention.

7 is a cross-sectional view of the image display body taken along line XX of FIG.

FIG. 8 is a cross-sectional view of a thermal transfer sheet used to create the image display body of FIG.

9 is a cross-sectional view of a thermal transfer sheet used for producing the image display body of FIG.

FIG. 10 is a conceptual diagram showing an image detected and recognized by infrared irradiation of the image display body of FIG.

FIG. 11 is a plan view of an image display body according to another embodiment of the second aspect of the present invention.

12 is a cross-sectional view of the image display body taken along line XX of FIG.

13 is a cross-sectional view of a thermal transfer sheet used for producing the image display body of FIG.

FIG. 14 is a conceptual diagram showing an image detected and recognized by infrared irradiation of the image display body of FIG.

FIG. 15 is a side view showing an example of a thermal transfer ribbon used for producing the thermal transfer sheet of the present invention.

FIG. 16 is a conceptual diagram illustrating successive manufacturing steps for manufacturing an image display body via the thermal transfer sheet of the present invention.

[Explanation of symbols]

1, 11 and 21 Image display 2 Substrate 3, 23 Image 4 Information recording layer 5 Concealment layer 6, 6 ', 16, 16', 16 "Thermal transfer sheet 7 Image receiving layer 8 Release layer 9 Heat resistant base sheet 10 Hologram pattern 12 Hologram Forming Layer 13 Transparent Thin Film Reflecting Layer 14 Attribute Information 15 Printing Section 17 Thermal Transfer Ribbon 18 Heat Resistant Supporting Film 19 Concealment Layer Transfer Section 19a Yellow 19b Magenta 19c Cyan 20 Information Recording and Transfer Section 22 Image Forming Device a Transfer Drum b Thermal Head c Guide roll d Heat roll e Unwind roll f Take-up roll

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B41M 5/38 G03H 1/02 1/18

Claims (10)

[Claims] 1. An image receiving layer having an information recording portion containing an image and an infrared light absorbing substance formed thereon is laminated on at least a substrate, and infrared light is transmitted on the information recording portion, and An image display body, which is formed by coating a hiding layer that absorbs visible light. 2. An image receiving layer having an information recording portion containing an image and an infrared light absorbing substance formed on at least a base material, a transparent thin film reflecting layer, and a hologram layer, which are laminated in this order on the information recording portion. Is an image display body formed by coating a concealing layer that transmits infrared light and absorbs visible light. 3. The image display according to claim 2, wherein the transparent thin film reflective layer has a refractive index larger than that of the hologram layer. 4. The image of the image receiving layer is formed on the information recording portion, and also serves as a concealing layer that transmits infrared light and absorbs visible light. The image display body described in. 5. A heat resistant base sheet, a release layer,
An information recording portion containing an image and an infrared light absorbing substance is formed, and an image receiving layer having thermal adhesiveness is sequentially laminated, and infrared light is transmitted through the information recording portion, and visible light is transmitted. A thermal transfer sheet, which is formed by coating an absorbing masking layer. 6. A heat-resistant base sheet, a release layer,
An information recording part containing a hologram layer, a transparent thin film reflective layer, an image and an infrared light absorbing substance is formed, and an image receiving layer having thermal adhesiveness is sequentially laminated, and infrared light is formed on the information recording part. A thermal transfer sheet, which is formed by coating a concealing layer that transmits light and absorbs visible light. 7. The thermal transfer sheet according to claim 6, wherein the transparent thin film reflective layer has a larger refractive index than the hologram layer. 8. The image of the image-receiving layer is formed on the information recording portion, and also serves as a concealing layer that transmits infrared light and absorbs visible light. The thermal transfer sheet described in. 9. A heat resistant base sheet, a release layer,
In a method for producing an image display body using a thermal transfer sheet which is capable of forming an image by sublimation transfer and / or thermal fusion transfer and has thermal adhesiveness to a transfer surface, the image and infrared light are provided on the image receiving layer surface. And a respective hiding layer that transmits visible light is formed, and subsequently the image receiving layer surface of the thermal transfer sheet formed by transferring and forming an information recording portion containing an infrared light absorbing substance on the hiding layer is used as a base material. A method for producing an image display body, which comprises press-bonding to an adherend surface and transferring and forming each layer of a thermal transfer sheet excluding the heat resistant base sheet. 10. The image display according to claim 9, wherein an image which transmits infrared light and absorbs visible light is formed in the information recording portion of the image receiving layer and also serves as a concealing layer. Production method.