JPH06314057A - Transparent hologram - Google Patents

Abstract

PURPOSE:To form display parts for characters and graphics on the surface of a base in such a manner that viewing is not obstructed by formation of a hologram and that a sufficient hologram effect is exhibited by forming a thin-film layer consisting of a transparent material having the refractive index different from the refractive index of a hologram forming layer on the relief surface of this hologram forming layer. CONSTITUTION:The display parts 2 are formed on the base 1 and the transparent type hologram 3 is formed in the upper part position of the display parts 2. The transparent type hologram 3 is constituted by forming a hologram effect layer on the hologram forming layer 4. For example, the hologram forming layer 4 is provided with the relief forming surface 5 as the hologram forming surface and the relief forming surface 5 is provided with the thin-film layer 6 as the hologram effect layer. The thin-film layer 6 consists of a transparent material which is capable of exhibiting the hologram effect and does not conceal the display parts 2 of the lower layer and varys in the refractive index from the hologram forming layer 4. The refractive index of the thin-film layer 6 may be larger of smaller than the refractive index of the hologram forming layer in such a case and 0.1 difference in the refractive index is more preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in holograms, and more specifically, it appears as a mere transparent body outside the reproducible angle range of holograms, and as a reflection hologram within the reproducible angle range of holograms. It is related to a transparent hologram that is designed to produce the effect of.

[0002]

2. Description of the Related Art Holography is a new technique for recording the wavefront of light from an object. A hologram produced by this technique can reproduce a stereoscopic image and also enables multiple recording. Become. Taking advantage of such peculiar appearance and novelty of hologram, it is attempted to form the hologram by a method such as transfer, pasting or direct formation on a support such as a credit card, cash card, book cover, record jacket, etc. Has been done in various ways.

[0003]

Usually, a support such as a card or a cover of a book is provided with a display portion such as characters or a pattern on its surface. In this case, the position where the hologram is formed is It becomes a problem. Heretofore, it has been common to provide a hologram in a portion where a display portion such as characters and pictures is not provided. Since the hologram provided on the support such as cards is usually a reflection hologram, the hologram itself,
This is because it lacks transparency, and therefore providing a hologram on the display portion for characters or the like can prevent the display portion for characters or the like from being visually recognized and diminish the display effect.

For example, in a relief hologram, which is a kind of hologram, a reflective metal thin film (for example, an aluminum thin film) is formed on the relief forming surface by vapor deposition or the like (the film thickness is usually 1000 Å). When it is provided on the display unit, the light wave propagating in the metal thin film is attenuated in the traveling direction, so that the display unit cannot be seen from the outside. Therefore, conventionally, there is no choice but to provide a hologram in a portion where a display portion such as a character is not provided. Therefore, 1) there is a restriction on the hologram forming position, which lacks flexibility in design. , It is difficult to form a hologram depending on the arrangement and size of the display unit provided on the support, or there is no choice but to allow some reduction of the display effect of the display unit. ) In order to more reliably prevent counterfeiting of cards and cash vouchers, it is desirable to form a hologram on the display part such as the number display, magnetic recording part, and stamp part, but it has been the case in the past for the reasons described above. However, there are drawbacks such as lack of proper means for preventing forgery because it is difficult. Furthermore,
Since the reflective metal film is usually silver-white and has high brightness, there is a problem that a feeling of strangeness is great when a hologram is provided on various supports such as cards.

[0005]

The transparent hologram of the present invention has the relief of a hologram forming layer made of a thermosetting resin, an ionizing radiation curable resin or an ultraviolet curable resin having a relief hologram relief surface on the surface thereof. A thin film layer made of a transparent material having a refractive index different from that of the hologram forming layer is formed on the surface. Further, the difference between the refractive index of the hologram forming layer and the refractive index of the thin film layer may be 0.1 or more. Furthermore, it may be formed on a base film, or if necessary, an adhesive layer may be formed on the side opposite to the base film to form a hologram transfer foil, or an adhesive layer may be formed, or if necessary, The release paper may be laminated on the pressure-sensitive adhesive layer to form a hologram label, or may be formed on the support or, if necessary, formed on the support through the display part, and may be formed at the bottom of the thin film layer. The display part may be formed on the.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a transparent hologram of the present invention, in which 1 is a support, a display unit 2 is provided at an arbitrary position of the support 1, and a transparent type is provided above the display unit 2. A hologram 3 is provided. In the present invention, the transparent hologram refers to a hologram which has a property of not hiding the display portion, that is, transparency, and which is transparent in itself and thus has a function as a hologram. The above-mentioned "transparent" means that the display part is not hidden, and therefore a semitransparent one is also included in the present invention. The transparent hologram 3 is configured by providing a hologram effect layer for increasing the hologram effect on the hologram forming layer. In the present invention, the hologram effect layer is preferably a thin film layer having a thickness in the transparent region of the material forming the effect layer, generally 10 to 10000Å is preferred, and more preferably 100 to 10 Å. 5000 Å, and one example of the configuration of the present invention is shown in FIG. This figure shows an example of the structure in which the transparent hologram is a relief hologram. The hologram forming layer 4 is provided with a relief forming surface 5 as a hologram forming surface, and the relief forming surface 5 is further provided with a hologram effect layer. Is provided as a thin film layer 6. 7 is an adhesive layer. The thin film layer 6 is
It is made of a transparent material which is capable of exhibiting the hologram effect and which does not hide the display portion of the lower layer and which has a different refractive index from the hologram forming layer. In this case, the refractive index of the thin film layer 6 may be larger or smaller than that of the hologram forming layer, but the difference in refractive index is preferably 0.1 or more, more preferably 0.5 or more. According to the experiments by the present inventors, 1.0
It is optimal to be larger than the above. By providing the transparent thin film layers having different refractive indexes as described above, the hologram effect is exhibited and the display portion of the lower layer is not hidden.

As the specific material of the thin film layer, for example, the following materials (1) to (5) can be used. (1) Transparent continuous thin film having a refractive index larger than that of the hologram forming layer. There are a transparent continuous thin film in the visible region and a transparent continuous thin film in the infrared or ultraviolet region. The former is shown in Table 1 and the latter is shown in Table 2. Are shown respectively. In the table, n indicates a refractive index (hereinafter, (2) to
The same applies to (4)).

[Table 1] Visible region transparent body

[Table 2] Infrared or ultraviolet region transparent body (2) Transparent ferroelectric having a refractive index larger than that of the hologram forming layer.

[Table 3] (3) Transparent continuous thin film having a smaller refractive index than the hologram forming layer is shown in Table 4.

[Table 4] (4) Resin with Different Refractive Index from Hologram Forming Layer The hologram forming layer may have a larger or smaller refractive index. Examples of these are shown in Table 5.

[Table 5] In addition to the above, general synthetic resins can be used, but resins having a large difference in refractive index from the hologram forming layer are particularly preferable. (5) A laminated body obtained by appropriately combining the materials of (1) to (4) above. The combination of the materials (1) to (4) is arbitrary, and the vertical positional relationship of each layer in the layer structure is also arbitrarily selected. As a method for forming the thin film layer 6 on the hologram forming layer 4, when the thin film layer 6 is made of the materials (1) to (3), a vacuum deposition method, a sputtering method, a reactive sputtering method, an ion plating method. A general thin film forming means such as an electroplating method can be used, and when the thin film layer 6 is made of the material (4), a general coating method can be used. When the thin film layer 6 is made of the material (laminate) of the above (5), the above-mentioned means, methods and the like are appropriately combined and used. In the case of the material of (4) above, the material may not be a thin film as long as it is a transparent material, and as another embodiment of the present invention, a resin layer having a thickness equal to or larger than the thin film may be provided in the hologram forming layer. When the transparent hologram is a relief hologram,
The display unit 2 and the support 1 may be located on the side of the relief forming surface or on the side of the surface opposite to the relief forming surface, and the present invention applies any configuration. Also, in the hologram other than the relief hologram, the display unit 2
The support 1 may be located on the thin film layer forming surface side or on the surface opposite to the thin film layer forming surface side. Further, in the case of a relief hologram, the thin film layer 6 may be provided so as to fill the relief forming surface (that is, one surface becomes a flat surface).
Alternatively, it may be provided so as to follow the relief forming surface (that is, one surface becomes an uneven surface). The hologram forming layer 4 is generally made of resin. This hologram forming resin layer has a single layer structure or a multilayer structure (for example, a hologram forming resin provided on a substrate film, or the hologram forming resin itself has a laminated structure). Existing). The hologram forming layer may be a plane hologram or a volume hologram, and in the case of a plane hologram, a relief hologram is particularly preferable in terms of mass productivity and cost. In addition, Frennel holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser reproduction holograms such as image holograms, white light reproduction holograms such as rainbow holograms, and color holograms utilizing these principles, computer holograms, hologram displays, A multiplex hologram, a holographic diffraction grating, or the like can be used. The hologram forming photosensitive material for recording the interference fringes includes silver salt, dichromated gelatin, thermoplastics, diazo photosensitive material, photoresist, ferroelectric, photochromic material, thermochromic material, chalcogen. Glass or the like can be used.

In the present invention, as the material of the hologram forming layer, thermoplastic resin such as polyvinyl chloride, acrylic (eg, MMA), polystyrene, polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane ( (Meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate,
It is possible to use a cured product of a thermosetting resin such as melamine (meth) acrylate or a triazine-based acrylate, or a mixture of the above-mentioned thermoplastic resin and thermosetting resin. Further, as the material of the hologram forming layer of the present invention, a thermoformable substance having a radical polymerizable unsaturated group can be used, and there are the following two types. (1) A polymer having a radically polymerizable unsaturated group in a polymer having a glass transition point of 0 to 250 ° C. More specifically, as the polymer, the following compounds (1) to (2) to (1) to (4) described below are prepared by polymerizing or copolymerizing the following compounds.
Thus, a radical-polymerizable unsaturated group introduced can be used. Monomers having hydroxyl groups: N-methylol acrylamide, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 2 -Hydroxy-3-phenoxypropyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, and the like. Monomers having a carboxyl group: acrylic acid, methacrylic acid, acryloyloxyethyl monosuccinate, etc. Epoxy group-containing monomer: Grildil methacrylate, etc. Monomers having an aziridinyl group: 2-aziridinylethyl methacrylate, allyl 2-aziridinylpropionate and the like. Monomers having amino groups: acrylamide, methacrylamide, diacetone acrylamide, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate and the like. Monomers having sulfone groups: 2-acrylamido-2-methylpropanesulfonic acid, etc. Isocyanate group-containing monomers: 2,4-toluene diisocyanate and 2-hydroxyethyl acrylate, such as an adduct of 1 mole to 1 mole of diisocyanate and an additive of a radical-polymerizable monomer having active hydrogen. Further, in order to control the glass transition point of the above copolymer or to control the physical properties of the cured film, the above compound and a copolymerizable monomer such as You can also let it. Examples of such a copolymerizable monomer include methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, and t-methacrylate.
Examples thereof include butyl acrylate, t-butyl methacrylate, isoamyl acrylate, isoamyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and the like.

Next, the polymer obtained as described above is reacted by the following methods (a) to (d) to introduce a radical-polymerizable unsaturated group to obtain a hologram-forming resin. it can. (A) In the case of a polymer or copolymer of a monomer having a hydroxyl group, a monomer having a carboxyl group such as acrylic acid or methacrylic acid is subjected to a condensation reaction. (B) In the case of a polymer or copolymer of a monomer having a carboxyl group or a sulfone group, the above-mentioned monomer having a hydroxyl group is subjected to a condensation reaction. (C) In the case of a polymer or copolymer of a monomer having an epoxy group, an isocyanate group or an aziridinyl group, the above-mentioned monomer having a hydroxyl group or a monomer having a carboxyl group is subjected to an addition reaction. (D) In the case of a polymer or copolymer of a monomer having a hydroxyl group or a carboxyl group, a monomer having an epoxy group, a monomer having an aziridinyl group, or a diisocyanate compound and a hydroxyl group-containing acrylate monomer 1 to 1 mol of the adduct is subjected to an addition reaction. In order to carry out the above reaction, it is preferable to add a trace amount of a polymerization inhibitor such as hydroquinone and to carry out it while sending dry air. (2) A compound having a radically polymerizable unsaturated group having a melting point of 0 to 250 ° C. Specifically, stearyl acrylate, stearyl methacrylate, triacryl isocyanurate, cyclohexanediol diacrylate,
Examples thereof include cyclohexanediol dimethacrylate, spiroglycol diacrylate, and spiroglycol dimethacrylate. Further, in the present invention, the above (1) and (2) may be mixed and used, and
A radically polymerizable unsaturated monomer may be added to them. This radically polymerizable unsaturated monomer is to improve the crosslink density and heat resistance upon irradiation with ionizing radiation, and in addition to the above-mentioned monomers, ethylene glycol diacrylate, ethylene glycol dimethacrylate, Polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, hexanediol diacrylate, hexanediol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane diacrylate, trimethylolpropane dimethacrylate, pentaerythritol tetraacrylate, penta Erythritol tetramethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentae Thylitol hexaacrylate, dipentaerythritol hexamethacrylate, ethylene glycol diglycidin ether diacrylate, ethylene glycol diglycidyl ether dimethacrylate, polyethylene glycol diglycidyl ether diacrylate, polyethylene glycol diglycidyl ether dimethacrylate, propylene glycol diglycidyl ether di Acrylate, propylene glycol diglycidyl ether dimethacrylate, polypropylene glycol diglycidyl ether diacrylate, polypropylene glycol diglycidyl ether dimethacrylate, sorbitol tetraglycidyl ether tetraacrylate, sorbitol tetraglycidyl ether tetramethacrylate, etc. Bets can be, with respect to solid content 100 parts by weight of the copolymer mixture described above, it is preferably used in an 0.1 parts by weight. Further, although the above are sufficiently curable by electron beam, when cured by ultraviolet irradiation, benzoquinone as a sensitizer, benzoin, benzoin ethers such as benzoin methyl ether, halogenated acetophenones, biatyls. Those that generate radicals by irradiation with ultraviolet rays, such as, can also be used.

The hologram forming layer can be obtained by a conventionally known method. For example, when the transparent hologram is a relief hologram, the hologram original plate on which interference fringes are recorded in the form of depressions and projections is used as a press die, the hologram forming resin sheet is placed on the hologram original plate, and both are formed by means of a heating roll or the like. The hologram forming layer can be obtained by a method of heating and pressing to duplicate the uneven pattern of the hologram original plate on the surface of the hologram forming resin sheet.

The display unit 2 refers to all visually appealing objects, and may or may not have a specific meaning in terms of content, and may be functionally intended for design and appearance decoration. Alternatively, it may be for information purposes. Examples of such a display unit are images of characters, numbers, symbols, figures, patterns, tint blocks, etc .; barcodes, O
Equipment read information such as CR, MICR, bit data; personal identification information such as fingerprints, facial photographs, signatures; identification mark of registered trademark; authentication display such as company name stamp and registration stamp. Further, the display section may be a continuous printing layer provided by solid printing of an arbitrary hue. As the display means of the display unit, 1) printing, 2) silver salt photograph, blueprint, diazo photograph, dichromated gelatin photograph, photoresist, photochromy, electrophotography, thermomagnetic recording, thermoplastic recording, 3 ) Display by hard copy means, for example, electro-sensitive recording such as discharge recording, electrolytic recording, electrostatic recording, electro-recording; pressure-sensitive recording using carbon or carbon-free; physical or chemical thermal recording, 4) Laser recording, holography, magnetic recording, engraving, embossing,
Examples include sky papermaking method display, handwriting display, and liquid crystal display display. The display unit 2 may be provided on the support 1 as shown in FIGS. 2 and 5, or may be provided on the surface (lower surface) of the thin film layer 6 although not particularly shown. Display unit 2
Is provided on the support body 1, the display unit 2 may be provided on the upper surface of the support body 1 as shown in FIG. 2 or may be provided inside the support body 1 as shown in FIG. It may be provided on both the upper surface and the inside of the support 1. Further, the display unit 2 is not limited to being provided only at the lower position of the transparent hologram 3, but may be provided at the upper position of the transparent hologram 3 as shown in FIG. Further, the transparent hologram 3 may be further provided with a protective layer such as a protective plate, a protective film and a protective coating layer. For example, in the case of a three-layer laminated plastic card, a transparent hologram is formed by heat-sealing a transparent vinyl chloride oversheet on and under a sheet having a vinyl chloride core sheet on which a picture layer is provided and a transparent hologram is further provided thereon. It can also be a plastic card with.

As the material of the support 1, paper such as Japanese paper, kraft paper, Clupak paper, crepe paper, corrugated paper, high-quality paper, OCR paper, MICR paper, foam paper, coated paper, art paper, synthetic paper and the like; paper Cover materials such as cloth paper, cloth cloth paper, leather; polyvinyl chloride, thermoplastic polyester, polymethacrylate, polyvinyl acetate, polyacrylate, polyethylene, polypropylene, polystyrene, polyvinylidene chloride, polyacrylonitrile, polycarbonate, polyamide, polyurethane, Polyimide, cellulosic resin, synthetic rubber resin, natural rubber resin, phenol resin, urea resin, melamine resin, epoxy resin, alkyd resin, unsaturated polyester resin, and mixed resins and copolymers of appropriate combinations thereof. Plastics such as resins; Synthetic rubber, rubber such as natural rubber;
Copper, iron, aluminum, tin-lead, and alloys of appropriate combinations thereof; fibers such as cotton, staple fibers, synthetic fibers, glass fibers, and non-woven fabrics; wood and other wood-based materials; glass; appropriate combinations of the above various materials Combined composite materials are used.
The support 1 can have various shapes such as a paper sheet, a plate, a sheet, a film and a foil, and the shape and thickness can be arbitrarily selected. The support 1 may be transparent or opaque, so the transparent hologram 3 may be a reflective hologram or a transparent hologram.

In order to provide the transparent hologram 3 on the support 1, a hologram transfer foil is formed in advance, and this is provided by a transfer method, or a hologram label is formed, and this is made by an adhesive method. It may be provided. One configuration example of the hologram transfer foil is shown in FIG. The hologram transfer foil 8 shown in the figure is formed by laminating a protective layer 10, a hologram forming layer 4, a thin film layer 6, and an adhesive layer 7 on a base film 9 in this order. As the material of the base film 9, polymer films such as polyethylene terephthalate, polyimide, polymethylmethacrylate, polystyrene, polyvinyl butyral, and polycarbonate, synthetic paper, metal films such as iron, and laminates thereof are used. Protective layer 10
Has a role of providing a peeling property between the base film 9 and the hologram forming layer 4, and also providing printability of the surface after transfer, protection of the hologram forming layer 4, etc., and the material thereof is an acrylic resin, Cellulose-based resin, vinyl-based resin, polyester-based resin, urethane-based resin, olefin-based resin, amide-based resin, epoxy-based resin and the like are exemplified, and the film thickness thereof is 0.1 to 10 μm, preferably 0.5 to 5 μm. Is preferred. As the material of the adhesive layer 7, a wide variety of known adhesives such as acrylic resins, vinyl resins, polyester resins, urethane resins, amide resins, epoxy resins, rubber resins, and ionomer resins are used. It can be used and its film thickness is 0.
It is preferably 1 to 50 μm, and more preferably 1 to 10 μm. In order to enhance the adhesiveness between the hologram forming layer 4 and the protective layer 10 and enhance the durability of the hologram forming layer 4, an overprint layer made of a curable acrylic resin, a cellulose resin, a vinyl resin, or the like is used as the hologram. It may be provided between the forming layer 4 and the protective layer 10, and the thin film layer 6
In order to enhance the adhesiveness between the adhesive layer 7 and the adhesive layer 7, an anchor layer made of vinyl chloride-vinyl acetate copolymer, acrylic resin, urethane resin or the like is provided between the thin film layer 6 and the adhesive layer 7. Good.

Hologram transfer foil 8 constructed as described above
Is laminated on the support 1 so that the adhesive layer 7 is in contact with the surface of the support 1, and the base film 9 is peeled off by heating and pressing, whereby the transparent hologram 3 is transferred to the support 1 (FIG. 2). Such a structure is provided, for example, as shown in FIG. 1, on a support 1 configured as a fixed deposit certificate, a display unit 2 formed by printing as a bank name and an authentication seal, and the display unit 2. It is applied to the embodiment including the transparent hologram 3. An example of the structure of the hologram label is shown in FIG. The hologram label 11 shown in the figure is formed by laminating a hologram forming layer 4, a thin film layer 6, an adhesive layer 13, and a release paper 14 on a base sheet 12. The base material sheet 12 serves to protect the hologram forming layer 4 and increase the mechanical strength of the whole.
Polyvinyl chloride, polyester acrylic resin, epoxy resin, amide resin, urethane resin or the like is used, and the film thickness thereof is preferably 10 to 500 μm.

The material of the adhesive layer 13 is acrylic,
A general adhesive such as a rubber type is widely used. This pressure-sensitive adhesive is obtained by adding a tackifier to an elastic body, and as the elastic body, polyisoprene rubber, polyisobutyl rubber, SB
Examples of the tackifier include polyterpene resin, gum rosin, rosin ester and rosin derivatives, oil-soluble phenol resin, coumarone indene resin, Examples include petroleum hydrocarbons. In addition to the tackifier, a softening agent, a filler, an antiaging agent, etc. may be added. The thickness of the adhesive layer 13 is 0.1 to
It is preferably 50 μm.

As the release paper 14, used is a base material such as paper or film coated with silicone resin, wax, paraffin or the like. An anchor layer similar to that in the hologram transfer foil may be provided between the thin film layer 6 and the adhesive layer 13 in order to enhance the adhesiveness between the thin film layer 6 and the adhesive layer 13. Hologram label 11 configured as described above
Is cut and formed into an appropriate size, and the transparent hologram 3 can be provided on the support 1 by peeling off the release paper 14 and sticking it on the support 1 via the adhesive layer 13 (FIG. 5). . Such a configuration has, for example, a support 1 configured as a magnetic card, a display unit 2 displaying the name of the owner of the magnetic card, and the display unit 2 as shown in FIG.
The present invention is applied to the embodiment including the transparent hologram 3 provided above.

In the embodiment in which the display unit 2 is provided on the support 1, the display unit 2 is not limited to being provided on the support 1 in advance. For example, in constructing the hologram transfer foil 8 and the hologram label 11, the display 2 is provided below or inside the adhesive layer 7 and the adhesive layer 13, respectively, and the hologram transfer foil 8 and the hologram label 11 are attached to the support 1 It is also possible to configure so that the display unit 2 is transferred and adhered together with the transparent hologram 3 when they are transferred and adhered respectively. In addition, the transparent hologram is not limited to being provided on a smooth surface, and may be provided on an uneven surface as in the case of being provided on a display portion in which characters and the like are embossed in a convex shape. Furthermore, the hologram itself is not embossed. May be.

In the present invention, the support (having a display portion) on which the transparent hologram is to be formed covers all articles, products and products. Therefore, specific examples of the transparent hologram forming body include cartons, containers, bags, cassette cases, cassette halves, floppy cases, wrapping paper and other packages; stock certificates, checks, bills, securities, certificates,
Banknotes, boarding tickets, wagon tickets, stamps, stamps, appreciation tickets, etc .; cash cards, credit cards, members' cards, greeting cards, postcards, business cards, IC cards, etc .; other forms, envelopes, Tags, Shiori, calendars, posters, brochures, passports, POP supplies, coasters, displays, nameplates, keyboards, cosmetics, accessories (clocks, writers), stationery, building materials, radios, TVs, speakers, calculators, car instrument panels , Emblems, keys, clothing, footwear, devices, OA equipment and the like.

When the transparent hologram is constructed as a reflection hologram in the present invention, due to the angle dependence of the reproduction which is a characteristic of the hologram, it appears as a mere transparent body outside the reproducible angle range of the hologram, and the reproduction of the hologram. The light reflectance is maximized within the possible angle range, and the effect as a reflection hologram appears. next,
The present invention will be described in more detail with reference to specific examples.

(Example 1) Thickness 2 made of polyester
A protective layer, a hologram forming layer, a transparent continuous thin film layer and an adhesive layer were sequentially formed on one surface of a 5 μm base film to obtain a hologram transfer foil. The composition of each layer is as follows.
The hologram forming layer was formed as a relief hologram after forming the resin layer. Protective layer composition Cellulose acetate resin 5 parts by weight Methanol 25 parts by weight Methyl ethyl ketone 45 parts by weight Toluene 25 parts by weight Methylolated melamine resin 0.5 parts by weight Paratoluene sulfonic acid 0.05 parts by weight Hologram forming layer composition Acrylic resin 40 parts by weight Melamine resin 10 parts by weight Anon 50 parts by weight Methyl ethyl ketone 50 parts by weight Transparent continuous thin film layer composition ZnS adhesive layer composition Vinyl chloride / vinyl acetate copolymer 20 parts by weight Acrylic resin 10 parts by weight Ethyl acetate 20 parts by weight Toluene 50 parts by weight Letters on fine paper After the hologram transfer foil obtained as described above is superposed on the printed portion of the savings certificate provided with the pattern by the offset printing method so that the adhesive layer is in contact with the printed portion, the base of the transfer foil is formed. Apply a hot plate to the film side, 170 ℃, 50Kg heating under the conditions of cm ^2, pressurized and then transferred to transparent hologram peel off the base film on the deposit certificate. When the obtained savings certificate containing the hologram was observed, characters and the like could be seen from the top of the hologram, and a stereoscopically reproduced image of the hologram was recognized by viewing it at different angles.

Example 2 The following composition was refluxed for 6 hours for copolymerization. Methyl methacrylate 284 parts by weight 2-hydroxyethyl methacrylate 130 parts by weight ethyl acetate 1100 parts by weight α, α′-azobisisobutyronitrile 2 parts by weight Then, 0.1 parts by weight of paramethoxyphenol is added to the obtained reaction product. After stopping the addition reaction, 100 parts by weight of 2-hydroxyethyl methacrylate and 1 mol to 1 mol adduct of 2,4-toluene diisocyanate were added, and further 5 parts by weight of dibutyltin dilaurate was added, and dry air was sent. While reacting at 80 ° C for 5 hours. After cooling the reaction solution to room temperature, 15 parts by weight of an ultraviolet sensitizer (Irgacure 184 manufactured by Ciba Geigy) was added and uniformly dissolved to obtain an ultraviolet curable resin composition. Next, a 200 μm-thick polyethylene terephthalate film as a base sheet was coated with 2 μm of the ultraviolet resin composition to prepare a hologram forming film. This hologram forming film could be stored in a wound state without stickiness at room temperature. Next, the resin surface of the obtained film and the concave-convex surface of the mold on which the hologram is recorded in the shape of concave-convex are overlapped, and heated and pressed using a nip roll at 150 ° C and a pressure of 20 Kg / cm ² , The mold and the film were brought into close contact with each other. 80W from the film side with these closely attached
10 cm under an ultraviolet lamp with an output of / cm
The coated resin was cured by irradiating it with ultraviolet rays at a speed of m / min. Then, the film was peeled from the seed mold to obtain a relief hologram. Next, as a transparent continuous thin film layer, T
iO ₂ was heated and evaporated by an electron beam heating method, and a 200 Å thin film was vacuum-deposited on the relief forming surface. Next, a transparent continuous thin film surface of the hologram forming film and the adhesive are formed while coating the release surface of the release paper coated with silicone resin on a paper base with an acrylic ester adhesive to form a film of 20 μm. The faces were contacted and dry laminated to obtain a hologram seal. The hologram seal was punched out to obtain a hologram label having an appropriate shape, the release paper of the label was peeled off, and the hologram label was attached on a plastic card. This plastic card has a magnetic stripe transferred 1
A 00μm vinyl chloride film, a 560μm hard vinyl chloride core on which letters and patterns are printed by offset printing, and another 100μm vinyl chloride film are laminated in a sandwich form with the vinyl chloride core at the center, and 150 ° C. , 50 Kg / cm ² under heat and pressure. The hologram label was attached to the corresponding position of the printed pattern. When the obtained card with hologram was observed, characters and the like could be seen from the top of the hologram, and a stereoscopically reproduced image of the hologram was confirmed by viewing at different angles.

[0022]

The transparent hologram according to the present invention is reproduced only within a specific reproduction angle range, and the hologram is not recognized at other normal angles and is merely seen as a transparent body. A hologram reproduced within the reproduction angle range has an advantage that it does not hinder the visual observation of the display portion such as characters and can exert a sufficient hologram effect. Further, in the vicinity of the reproducible angle range of the hologram, both the hologram and the display section can be viewed by merely changing the observation position, and the duality of the design is exhibited. As described above, according to the present invention, there is an advantage that the hologram effect and the display effect can be combined. According to the present invention, since the hologram does not obstruct the viewing of the display portion, there is no restriction on the position where the hologram is formed on the support, and there is an effect that the degree of freedom in design is widened. Since there is no problem in appearance even if the hologram is placed on the part, when the present invention is applied to cards and cash vouchers, it is possible to effectively prevent forgery of cards and cash vouchers without reducing the commercial value. Can be planned. As described above, in the present invention, the hologram can be seen only as a transparent body outside the reproducible angle range. Therefore, silver white with high brightness as in the case of being provided on the conventional reflection type hologram support having a reflective metal thin film. There is no discomfort due to, and there is an effect that the appearance is excellent.

[0023]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment in which a hologram is provided by transfer.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a vertical sectional view of a hologram transfer foil.

FIG. 4 is a perspective view showing an embodiment in which a hologram is provided by pasting.

5 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 6 is a vertical sectional view of a hologram label.

[Explanation of symbols]

 1 Support 2 Display 3 Transparent Hologram

Claims (9)

[Claims] 1. A refractive index different from that of the hologram forming layer on the relief surface of the hologram forming layer made of a thermosetting resin, an ionizing radiation curable resin, or an ultraviolet curable resin having a relief hologram relief surface on the surface. A transparent hologram in which a thin film layer made of a transparent material is formed. 2. The transparent hologram according to claim 1, wherein the difference between the refractive index of the hologram forming layer and the refractive index of the thin film layer is 0.1 or more. 3. The transparent hologram according to claim 1, which is formed on a base film. 4. The transparent hologram according to claim 3, wherein an adhesive layer is formed on the side opposite to the base film. 5. The transparent hologram according to claim 1 or 2, wherein an adhesive layer is formed. 6. The transparent hologram according to claim 5, wherein a release paper is laminated on the adhesive layer. 7. The transparent hologram according to claim 1 or 2, which is formed on a support. 8. The transparent hologram according to claim 7, which is formed on a support through a display section. 9. The transparent hologram according to claim 1, wherein a display portion is formed below the thin film layer.