JP2000047556A - Production of article having light diffracting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the production method of article having light diffracting structure with which an article is provided with a light diffracting structure performing the display of picture patterns or the like or recording of characters or images through the radiation of laser beams onto the light reflecting layer of the light diffracting structure without exerting any adverse influence caused by the heat of laser beams upon an object to be transferred. SOLUTION: Concerning the production of article having light diffracting structure with which a light diffracting structure forming layer 4 and a light reflecting layer 5 are transferred on the article while using light diffracting structure transfer foil constituted by laminating the light diffracting structure forming layer 4 and light reflecting layer 5 on a support 1, one part of the light reflecting layer 5 is destroyed by irradiating the light diffracting structure transfer foil with laser beams 10 before transferring the light diffracting structure forming layer 4 and light reflecting layer 5 to the article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an article having a light diffraction structure formed with a hologram or a diffraction grating. In particular, by irradiating a laser beam to the light reflection layer of the light diffraction structure and destructing a part of the light reflection layer, light such as a display of a picture, a pattern, or the like, or a recording of a character, an image, or the like is formed. The present invention relates to a method for manufacturing an article having a light diffraction structure having a diffraction structure.

[0002]

2. Description of the Related Art Conventionally, various patterns, such as credit cards, cash cards, etc.
Articles having a light diffraction structure having a light diffraction structure such as a hologram or a diffraction grating on which a display of a pattern or the like or a recording of a character or an image is formed are already known. These light diffraction structures are generally formed by laminating a light diffraction structure forming layer and a light reflection layer.

Conventionally, as a method of forming a recorded display on these optical diffraction structures, for example, when recording an interference fringe of a diffraction grating or a hologram as a relief of the surface unevenness, the diffraction grating or the interference fringe is formed in an uneven shape. Using the original plate recorded and displayed as a press mold, a coating solution of the resin for the light diffraction structure forming layer is gravure coated on the protective layer of a laminated sheet in which a release resin layer and a protective layer are sequentially laminated on a support sheet. Coating method, roll coating method, applied by means such as a bar coating method, to form a coating film, on which the original plate is stacked, and by appropriate means such as a heating roll, and both are heated and pressure-bonded to form an original plate. The concave and convex pattern is duplicated on the light diffraction structure forming layer to form various recorded displays. As described above, the method of recording and displaying the diffraction grating or the interference fringes of the hologram on the surface of the light diffraction structure layer as the relief of the surface unevenness has mass productivity and can reduce the cost.

[0004] However, in the above-described recording display on the conventional optical diffraction structure, since the recorded display is formed by duplicating the concave and convex pattern of the original on the optical diffraction structure forming layer, the same recorded display content is mass-produced. Although it is preferable in the case, when it is desired to produce a variety of light diffraction structures having various different recording indications, or when it is desired to record and display variable information on the optical diffraction structure, it is difficult to produce, and the production efficiency is poor. There is a disadvantage that.

Therefore, in addition to the above-described recording and display of the concavo-convex pattern on the light diffraction structure forming layer, as a manufacturing method for performing a new recording and display on the light diffraction structure, for example, Japanese Patent Publication No.
85102 and Japanese Patent Publication No. 6-90590. According to the above-described known technique, a card with a hologram on which a hologram is transferred is prepared in advance, and a laser beam is irradiated on the reflection layer in contact with the hologram layer of the card to form a hole in the reflection layer. Is recorded and displayed.

However, in the method of irradiating the hologram layer of the card with a hologram with a laser beam as described above, heat is accumulated in portions other than the light reflection layer,
There is a danger that the vinyl chloride of the card substrate will burn and become black. As a cause of scorching, many of those used as card base materials, for example, paper, plastic, etc., are colored, and the pigment for coloring absorbs laser light and damages the card base material. May be the cause. When the card is used as a magnetic card conforming to ISO, a white polyvinyl chloride (hereinafter, referred to as PVC) sheet having a thickness of 280 μm is used as a core sheet.
100 μm thick transparent PV on both sides
A four-layer base sheet (total thickness of 0.7) in which C sheets are stacked as oversheets and stacked by hot pressing or the like
6 mm) is used, but when the hologram foil is transferred onto this base sheet and then the hologram foil is processed by laser light, the following problem occurs. If a laser absorbing pigment (for example, black with carbon black) is printed between the core sheet and the oversheet, laser irradiation is performed when the hologram foil transferred on the core sheet is subjected to laser processing. The surface becomes a convex swelling state in the portion where it is made. Since this phenomenon has not been rigorously analyzed and verified, its exact location is unknown, but the following is expected from the viewpoint of appearance and situation. Laser processing is to destroy a metal layer, and a laser beam is applied to a substrate by breaking the metal layer. Therefore, the laser is absorbed by the black ink portion, the ink is vaporized, the volume expands, and the oversheet layer is pushed up. As a result, it is considered that the surface of the card swells in a convex shape at the portion irradiated with the laser. Also, depending on the color of the printing ink formed on the surface of the card substrate, a color that easily absorbs laser light, for example,
There is a problem that the effect on the laser beam is different due to the difference in various conditions when the carbon black is superimposed with silica or their picture, and thus the color of the printing ink is restricted.

[0007]

As described above, in the state where the light diffraction structure is provided in advance on an article base material such as a card, the light reflection layer of the light diffraction structure is irradiated with laser light to form a light reflection layer. In the method of displaying various records on the
Irradiation of the laser beam may have an adverse effect on the article substrate.When irradiating the laser beam, the laser beam depends on the influence of the laser light on the material of each article substrate, the printing ink on the surface of the article substrate, and the processing conditions. It was necessary to change the light irradiation conditions, and there were various restrictions when processing the light reflection layer with laser light. In the present invention, without detrimental effects on the article by the irradiation of laser light, the light reflection layer of the light diffraction structure, the display of the pattern, pattern, and the like by the irradiation of the laser light, and the characters, images, etc. were subjected to recording. An object of the present invention is to provide a method for manufacturing an article having a light diffraction structure, which can manufacture an article having a light diffraction structure.

[0008]

In order to achieve the above-mentioned object, a method for producing an article having an optical diffraction structure according to the present invention comprises:
An article having a light diffraction structure formed by transferring the light diffraction structure forming layer and the light reflecting layer onto an article using a light diffraction structure transfer foil in which a light diffraction structure forming layer and a light reflecting layer are laminated on a support. In the manufacturing method, before transferring the light diffraction structure forming layer and the light reflection layer to the article, the light diffraction structure transfer foil is irradiated with laser light to partially destroy the light reflection layer. It is assumed that.

Further, there is provided a method for manufacturing an article having an optical diffraction structure, wherein the laser light is pulsed laser light.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for manufacturing an article having an optical diffraction structure according to the present invention will be described in detail with reference to an embodiment of the present invention, including its material and manufacturing method.

[About the Light Diffraction Structure Transfer Foil] (Support) As the support used for the light diffraction structure transfer foil of the present invention, each layer laminated thereon, that is, a release resin layer,
The heat resistance and solvent resistance when the protective layer, the light diffraction structure forming layer, the light reflection layer, and the adhesive layer are sequentially formed by coating or the like, and the formed light diffraction structure transfer layer is used as a base for an article such as a card. When using a thermal transfer method when transferring to a material, the heat resistance is required, and a plastic film having such performance, for example, a biaxially stretched polyethylene terephthalate film (hereinafter, simply referred to as a PET film) is used. Etc. can be used. PET
If a film is used, its thickness should be 5-250 μm
The thickness is more preferably 20 to 50 μm in consideration of workability, tensile strength, thermal efficiency during thermal transfer, and the like.

(Release resin layer) A release resin layer laminated on at least one surface of the support by coating or the like adheres well to the support and compares the resin of the protective layer formed thereon. It is preferable to use a resin that can be easily peeled off and has excellent heat resistance, solvent resistance, and the like. As such a resin, for example, various thermosetting resins having excellent crosslinking properties such as a melamine resin can be suitably used. By using such a resin while controlling the degree of crosslinking, the peeling force at the time of transfer can be appropriately adjusted. The releasable resin layer can be formed by a coating method using a reverse roll coater or the like, and its thickness may be thin, and about 0.1 to 4 μm is sufficient.

(Protective Layer) The protective layer provided on the release resin layer serves as the outermost layer of a card or the like after transfer to protect the lower layer, and has transparency, scratch resistance, and the like. A resin having abrasion resistance, heat resistance, chemical resistance, stain resistance and the like is suitable. Such resins include, for example, ionizing radiation-curable resins, specifically, polyurethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, and the like. To adjust the crosslinking density, a polyfunctional or monofunctional monomer may be added and used, and if necessary, a known photoreaction initiator and sensitizer may be added and used. In addition, a polyene / thiol-based ionizing radiation curable resin and the like are also excellent in abrasion resistance and can be preferably used.

If necessary, additives such as a surfactant, an antistatic agent, and an ultraviolet absorber may be added to the above-mentioned resin for the protective layer. Further, a method for providing a protective layer is as follows. After a coating solution is prepared from the resin composition for a protective layer and applied by various known roll coating methods or gravure coating methods, UV (ultraviolet) irradiation or EB (electron beam) irradiation is performed. ) The protective layer can be formed by curing the resin by irradiation or the like. In order to adjust the viscosity, an appropriate organic solvent may be added to the coating solution, if necessary. In this case, after coating, first, hot air drying is performed to remove the organic solvent, and then UV or EB is applied. The curing of the resin may be performed by the irradiation.

The thickness of such a protective layer is 0.5 to 4.0 μm in order to reduce the thickness of the entire light diffraction structure transfer layer.
It is preferable to be within the range. 0.5μ of protective layer thickness
When the thickness is less than m, sufficient abrasion resistance and abrasion resistance cannot be obtained, and when the thickness exceeds 4.0 μm, there is no necessity because the abrasion resistance is already sufficient. This is not preferable because the thickness of the entire transfer layer may increase and the magnetic recording / reading characteristics may decrease.

(Light Diffraction Structure Forming Layer) On the protective layer, a light diffraction structure forming layer, that is, a layer on which a hologram or a diffraction grating is formed is provided. The light diffraction structure itself can be used for both planar holograms and volume holograms. Specific examples are relief holograms, Lippmann holograms, Fresnel holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser reproduction holograms (such as image holograms), and white light. Examples include a reproduction hologram (such as a rainbow hologram), a color hologram, a computer hologram, a hologram display, a multiplex hologram, a holographic stereogram, and a holographic diffraction grating.

The material of the formation layer for forming these light diffraction structures is polyvinyl chloride, acrylic resin (eg, PMM
A), thermoplastic resins such as polystyrene and polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate , A thermosetting resin such as melamine (meth) acrylate or triazine acrylate can be used alone, or a mixture of the above-mentioned thermoplastic resin and thermosetting resin can be used. Or a material obtained by adding a radical polymerizable unsaturated monomer to these materials to make them ionizing radiation-curable. In addition, photosensitive materials such as silver salts, dichromated gelatin, thermoplastics, diazo photosensitive materials, photoresists, ferroelectrics, photochromic materials, thermochromic materials, and chalcogen glass can be used.

A method for forming a light diffraction structure using the above-mentioned materials can be formed by a conventionally known method.
For example, when recording interference fringes of a diffraction grating or hologram as a relief of surface irregularities, an original plate on which the diffraction gratings or interference fringes are recorded in the form of irregularities is used as a press mold, and a release resin Layer, a coating solution of the resin for the light diffraction structure forming layer is applied on the protective layer of the laminated sheet in which the protective layer is sequentially laminated by means of a gravure coating method, a roll coating method, a bar coating method, etc. A film is formed, and the original is superimposed thereon, and the two are heated and pressed by an appropriate means such as a heating roll, so that the concavo-convex pattern of the original can be duplicated. When a photopolymer is used, a photopolymer can be coated on the protective layer of the laminated sheet in the same manner, and then the original can be overlapped and irradiated with a laser beam to perform replication. Thus, the method of recording the diffraction grating or the interference fringes of the hologram on the surface of the light diffraction structure layer as a relief of the surface irregularities has mass productivity,
It is particularly preferable in that the cost can be reduced. The thickness of such a light diffraction structure forming layer is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 0.1 to 4 μm.

(Light Reflecting Layer) As described above, interference fringes of a diffraction grating or a hologram are recorded as a relief of irregularities on the surface of the light diffraction structure forming layer, and the light reflecting layer is formed on the relief surface in order to increase the diffraction efficiency. Form. As the material of the light reflection layer,
Aluminum (Al), zinc (Zn), indium (I
n), gold (Au), silver (Ag), cobalt (Co), tin (Sn), selenium (Se), titanium (Ti), iron (F
e), elemental metals such as tellurium (Te), copper (Cu), lead (Pb), nickel (Ni), palladium (Pd), or alloys thereof.

As a method of forming a thin film of the light reflecting layer, a thin film forming method such as a vacuum evaporation method, a sputtering method, and an ion plating method may be mentioned. For the thin film, appropriate conditions may be set according to the color tone, design, application, etc.
The range is preferably from 0 ° to 1 μm, more preferably from 100 to 100
0 ° is more preferred. When it is desired to provide a colored light reflecting layer having transparency, the film thickness is preferably 200 ° or less. When it is desired to provide a colored light reflecting layer having a concealing property, the film thickness is desirably 200 mm or more. The thin film is
As described above, the color tone, the concealing property, the transparency, and the like can be set as necessary in consideration of the use of the transfer foil and the total design.

(Adhesive Layer) The light diffractive structure transfer foil does not provide an adhesive layer in advance on the light reflecting layer, and the adhesive is used to transfer the light diffractive structure transfer layer onto the card substrate. The adhesive may be applied after coating on the layer, or the light diffraction structure transfer foil may be configured in a state where the adhesive layer is formed on the light reflection layer in advance, and has a light diffraction structure. It may be selected when determining the manufacturing process of the article. The material of the adhesive layer is preferably a material having good adhesiveness to the light reflection layer and capable of firmly adhering to a transfer object such as a card at the time of transfer. Specifically, vinyl chloride resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, acrylic resins, polyester resins, polyurethane resins, polyamide resins, rubber modified products, and the like. Suitable ones can be selected from among them, and these can be used alone or in a mixed system of two or more kinds, and can be used by further adding a hard resin, a plasticizer, and other additives as necessary. it can.

The adhesive layer formed of the above materials is
Usually, the material can be formed by applying a solution in the form of a solution, applying the solution with a roll coater or the like, and drying.
The thickness of the adhesive layer is preferably in the range of 0.5 to 5 μm,
The range of 1.5 to 3 μm is more preferable. As described above, the light diffraction structure transfer layer in which the protective layer, the light diffraction structure forming layer, the light reflection layer, and the adhesive layer are sequentially laminated on the release resin layer of the support as the light diffraction structure transfer layer. Foil can be manufactured. However,
The adhesive layer may be previously laminated on the light reflecting layer as described above, or the adhesive layer is not laminated on the light reflecting layer, and when transferring the light diffraction structure transfer layer, An adhesive may be applied. in this case,
When an adhesive layer is provided on the light reflection layer in advance, the adhesive can be applied over a wide area to produce the adhesive layer, so that the production efficiency is high. When an adhesive is applied when transferring the light diffraction structure transfer layer without providing an adhesive layer on the light reflection layer in advance, when the laser light is applied, the light reflection layer is directly irradiated with the laser light. Therefore, there is an advantage that the energy of the laser beam may be low and there is no danger of the adhesive being burned by the irradiation of the laser beam.

The light diffraction structure transfer foil having the above structure is irradiated with laser light by using laser light on the light reflection layer to display a picture or pattern to be applied or to record characters or images. By doing so, the portion of the light reflection layer irradiated with the laser beam is destroyed, and a pattern, pattern, character, record, or the like is formed on the light reflection layer, whereby the light diffraction structure transfer foil of the present invention is manufactured.

Further, it is desirable that the laser light applied to the light reflecting layer is pulsed light rather than continuous light. Continuous laser light is light that always keeps the same output for a certain period of time, whereas pulsed light is light that has high output only for a very short period of time. Does not accumulate on the substrate or the like, so that it is possible to perform design processing, depiction of characters, and the like without causing damage such as deformation and alteration at that portion. As a result, conditions that allow stable laser processing, such as the output of laser light, can be set broadly, so that stable processing can be performed without being affected by fluctuations in the output of laser light. As the pulse laser light used in the present invention, a method of controlling the output of a CW laser light by an external modulator, or inserting a Q switch into a laser resonator and storing the laser light in a laser medium by switching the Q switch. There is a method of instantly outputting the energy that has been applied. Specific examples of the former laser include an argon laser and He-N
There are e-lasers, YAG lasers, semiconductor lasers, etc., and a mechanical shutter, an A / O modulation element, an E / O modulation element, etc. are inserted as Q switches as external modulators, and several tens of Pulse light with a time width of nano to several hundred nanoseconds can be generated.

When irradiating the light diffraction structure transfer foil having the above structure with a laser beam, if the support is transparent to the laser beam, it can be irradiated from the support side or from the adhesive layer side. However, it is particularly preferable to irradiate from the adhesive layer side close to the light reflection layer because the light reflection layer can be destroyed by low-energy laser light. In addition, when the light diffraction structure transfer foil is formed into a roll sheet and processed,
In order to perform processing while keeping the distance between the transfer foil and the laser constant, the transfer foil can be wound around the drum and irradiated with laser light from the outside to break the light reflection layer. When wrapped so as to be in contact with and irradiate laser light from the support side, dust during processing accumulates on the drum, which is a factor that hinders stable processing.

As described above, as a preferable example, after manufacturing the light diffraction structure transfer foil having no adhesive layer, the light reflection layer is irradiated with laser light to process the light reflection layer. It may be stable to manufacture a light diffraction structure transfer foil on which a display of a pattern, a pattern, etc., and a record of characters, images, etc. are formed.

In the method for producing an article having a light diffraction structure according to the present invention, a light diffraction structure transfer foil comprising a support and a light diffraction structure forming layer and a light reflection layer laminated thereon is irradiated with laser light. After the display of a pattern, a pattern, or the like, a character, an image, or the like is formed on the light reflection layer by destroying a part of the light reflection layer, the light diffraction structure of the light diffraction structure transfer foil is formed on the article. Because the transfer layer is affixed, by controlling the irradiation of laser light, various types of different designs, such as designs, patterns, etc., image information such as face photographs, etc., and different machine readable for each article Since information such as barcodes, OCR characters, and OMR can be formed by destruction of the light reflecting layer, a wide range of recording and display options can be selected and can be adapted to various uses.

[About Article Having Light Diffraction Structure] The light diffraction structure transfer foil of the present invention transfers the light diffraction structure transfer layer onto an article as described above. Certain articles are information media that need to be particularly secure, such as credit cards,
Cards such as cash cards, ID cards, gift certificates,
Examples include cash vouchers such as stock certificates, identification cards, passports, driver's licenses, and the like. By attaching an optical diffraction structure to them, it is possible to prevent counterfeiting, falsification, and judge authenticity. Also, even for media that do not need to have security properties, irradiate with laser light,
By applying a design display such as a pattern or a pattern by destroying a part of the light reflection layer, a design effect excellent in design can be expected, so that watches, bags, accessories, containers, cosmetics, electric appliances, etc. Various articles may be provided with a light diffraction structure, and the surface of the light diffraction structure transfer layer is excellent in physical properties such as abrasion resistance, so that it can be widely used in various articles in general.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a specific embodiment of the method for manufacturing an article having an optical diffraction structure according to the present invention, a case where a card medium having an optical diffraction structure is manufactured using a card medium as a transfer object will be described below. This will be described in detail using an example. However, the present invention is not limited to these drawings and examples.

FIG. 1 is a schematic sectional view for explaining the structure of one embodiment of the light diffraction structure transfer foil. In FIG. 1, a light diffractive structure transfer foil 20 is provided with a releasable resin layer 2 on one surface of a support 1, and is further protected on the releasable resin layer 2 as a light diffractive structure transfer layer 7. A layer 3, a light diffraction structure forming layer 4, a light reflecting layer 5, and an adhesive layer 6 are sequentially laminated, and the protective layer 3 has an ionizing radiation curable resin having a thickness of 0.5 to 4.0 μm. Is used so that the abrasion resistance of the light diffraction structure transfer layer 7 after being transferred to the transfer object has a durability of 100 times or more in a wear resistance test using a Taber-type ab laser.

The light diffraction structure transfer layer 7 is applied to the card base material.
When transferring, for example, the adhesive layer 6 surface of the light diffraction structure transfer foil 20 is overlapped with the surface of the card substrate, and the support 1 is pressed by a hot press device or a hot stamping device.
By heating and pressing from the side, the adhesive layer 6 is melted or softened and adheres to the surface of the transfer-receiving body. Thereafter, the support 1 is peeled off to easily peel off at the interface between the release resin layer 2 and the protective layer 3, and the light diffraction structure transfer layer 7 having the protective layer 3 as the outermost layer is the transfer target. Transferred to card.

When the article having the light diffraction structure of the present invention is applied to a card medium, examples of the base sheet include polyvinyl chloride, polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene resin, acrylic resin,
In addition to resins such as polypropylene and polyethylene, metals such as aluminum and copper, paper, and impregnated paper such as resin or latex, etc., alone or in combination, can be used.

The thickness of the base sheet varies depending on the material, but is usually in the range of about 10 μm to 5 mm. In particular, in the case of a magnetic card, when the base sheet conforms to the ISO standard, its thickness is 0.76 m.
m. When the base sheet is formed of polyvinyl chloride (hereinafter, PVC), usually, a white PVC sheet having a thickness of 280 μm is used as a core sheet, two of which are stacked, and a transparent PVC sheet having a thickness of 100 μm is provided on both sides thereof. Are laminated as an over sheet and laminated by hot pressing or the like.
m) is used. In this case, the magnetic recording layer is provided on the surface of the transparent PVC sheet (oversheet) in the form of a tape or the entire surface in advance, so that the magnetic recording layer can be pressed into the base sheet even in the form of a tape during lamination by hot pressing or the like. It is integrated and laminated with a smooth surface.

Hereinafter, a specific embodiment will be described. [Example 1] (Production of light diffraction structure transfer foil) As shown in FIG.
A 25 μm-thick biaxially stretched transparent PET film (single-sided corona discharge treatment) was used, and a coating liquid for a release resin layer having the following composition was dried on the corona discharge-treated surface by a gravure reverse coating method. Was applied so as to have a thickness of 0.5 μm, thereby producing a support 1 on which the release resin layer 2 was laminated. Composition of coating solution for release resin layer Melamine resin 5 parts by weight Solvent Methyl alcohol 25 parts by weight Solvent Ethyl alcohol 45 parts by weight Cellulose acetate resin 1 part by weight Paratoluenesulfonic acid 0.05 part by weight

Next, a coating liquid for a protective layer having the following composition is applied on the release resin layer 2 by a gravure reverse coating method so that the thickness after curing becomes 0.5 μm, and ultraviolet irradiation is performed. Equipment (High pressure mercury lamp 2 with 160 W / cm output)
UV light was applied at a dose of 500 mJ / cm ² to cure the coating film, thereby forming the protective layer 3. Composition of coating solution for protective layer Polyurethane acrylate (prepolymer) 20 parts by weight Dipentaerythritol hexaacrylate 100 parts by weight 2-hydroxyethyl acrylate 5 parts by weight Photopolymerization initiator 1 part by weight Sensitizer 1 part by weight

Next, a coating solution for forming a light diffraction structure having the following composition was applied onto the protective layer 3 by a gravure rivers coating method so that the thickness when dried was 2 μm.
The resin layer was dried at 0 ° C. for 1 minute to form a resin layer for forming an optical diffraction structure. Composition of coating solution for forming optical diffraction structure layer Acrylic resin 40 parts by weight Melamine resin 10 parts by weight Solvent Cyclohexanone 50 parts by weight Solvent Methyl ethyl ketone 25 parts by weight

A hologram master is placed on a resin layer for forming the light diffraction structure, and the hologram master is placed at 150 ° C. and 50 kg / h.
After the hologram relief 8 was molded by applying heat and pressure under the condition of cm ² for 1 minute, the hologram master was peeled off to form the light diffraction structure forming layer 4 having the hologram relief 8.

Next, a thin film layer having a thickness of 350 ° was formed on the hologram relief forming surface of the light diffraction structure forming layer 4 using aluminum (Al) by a magnetron sputtering method to form a light reflecting layer 5.

An adhesive layer coating solution having the following composition was applied onto the light reflecting layer 5 by a gravure reverse coating method so that the thickness when dried was 2 μm, and dried to form an adhesive layer 6. An optical diffraction structure transfer foil of Example 1 was produced. Composition of Coating Solution for Adhesive Layer Vinyl chloride-vinyl acetate copolymer 20 parts by weight Acrylic resin 10 parts by weight Solvent Ethyl acetate 20 parts by weight Solvent Toluene 50 parts by weight The light diffraction structure transfer foil 20 of Example 1 produced as described above.
The thickness configuration of each layer is as follows. Support sheet (25 µm) / Releasable resin layer (0.5 µm) / Protective layer (0.5 µm) / Light diffraction structure forming layer (2 µm) / Light reflecting layer (350 °) / Adhesive layer (2 µm)

Then, as shown in FIG. 2, a YAG laser beam 10 having an output of 5 W, a beam spot size of 50 μm, and a wavelength of 1064 nm was applied from a laser beam source 9 to an objective lens 11.
Is focused on the light reflection layer 5 from the adhesive layer 6 side of the light diffraction structure transfer foil 20, and a part of the light reflection layer 5 is continuously destroyed by the laser light 10, so that the face image 1
3 was formed.

(Preparation of Card Having Optical Diffraction Structure) FIG.
As shown in the figure, a 0.76 mm-thick polyvinyl chloride sheet (two white core sheets and two transparent oversheets) was used.
The substrate sheet 14 of the transfer member composed of the layer stacking structure) is heated at 150 ° C. and 10 kg /
After the light diffraction structure transfer layer 7 of the light diffraction structure transfer foil 20 was transferred to the surface of the base material sheet 14 by heating and pressing under the condition of cm ² for 1 second, the release resin layer 2 and the support sheet 1 were separated. By peeling off, a card 30 having an optical diffraction structure of Example 1 as shown in FIGS. 4 and 5 was produced.

Example 2 (Preparation of Light Diffraction Structure Transfer Foil) As shown in FIG. 1, a biaxially stretched transparent PET film (single-sided corona discharge treatment) having a thickness of 25 μm was used as the support sheet 1 and its corona was used. On the discharge-treated surface, a coating liquid for a release resin layer having the following composition was applied by a gravure reverse coating method so that the thickness when dried was 0.5 μm, and the release resin layer 2 was laminated. A support sheet 1 was produced. Composition of coating solution for release resin layer Melamine resin 5 parts by weight Solvent Methyl alcohol 25 parts by weight Solvent Ethyl alcohol 45 parts by weight Cellulose acetate resin 1 part by weight Paratoluenesulfonic acid 0.05 part by weight

Next, a coating liquid for a protective layer having the following composition is applied onto the release resin layer 2 by a gravure reverse coating method so that the thickness after curing becomes 0.5 μm, and ultraviolet irradiation is performed. Equipment (High pressure mercury lamp 2 with 160 W / cm output)
UV light was applied at a dose of 500 mJ / cm ² to cure the coating film, thereby forming the protective layer 3. Composition of coating solution for protective layer Polyurethane acrylate (prepolymer) 20 parts by weight Dipentaerythritol hexaacrylate 100 parts by weight 2-hydroxyethyl acrylate 5 parts by weight Photopolymerization initiator 1 part by weight Sensitizer 1 part by weight

Next, a coating solution for forming a light diffraction structure having the following composition was applied onto the protective layer 3 by a gravure rivers coating method so that the thickness when dried was 2 μm.
The resin layer was dried at 0 ° C. for 1 minute to form a resin layer for forming an optical diffraction structure. Composition of coating solution for forming optical diffraction structure layer Acrylic resin 40 parts by weight Melamine resin 10 parts by weight Solvent Cyclohexanone 50 parts by weight Solvent Methyl ethyl ketone 25 parts by weight

A hologram master was placed on a resin layer for forming the light diffraction structure, and the hologram master was placed at 150 ° C. and 50 kg / h.
After the hologram relief 8 was molded by applying heat and pressure under the condition of cm ² for 1 minute, the hologram master was peeled off to form the light diffraction structure forming layer 4 having the hologram relief 8.

Next, on the hologram relief forming surface of the light diffraction structure forming layer 4, a thin film layer having a thickness of 350 ° was formed by magnetron sputtering using aluminum (Al) to form a light reflecting layer 5. The light diffraction structure transfer foil of Example 2 manufactured as described above has a configuration in which the adhesive layer 6 is not provided on the upper surface of the light reflection layer 5 with respect to the light diffraction structure transfer foil of Example 1. That is, the light diffraction structure transfer foil 20 without the adhesive layer 6 was manufactured from the structure of the light diffraction structure transfer foil 20 shown in FIG. The thickness configuration of each layer is as follows. Support sheet (25 μm) / Releasable resin layer (0.5 μm)
m) / protective layer (0.5 μm) / light diffraction structure forming layer (2 μm)
m) / Light reflection layer (350 °)

Next, with respect to the light diffraction structure transfer foil of Example 2 in which only the adhesive layer 6 of the light diffraction structure transfer foil 20 of FIG. The YAG laser beam 10 having a wavelength of 1064 nm is condensed on the light reflection layer 5 by the objective lens 11 and a part of the light reflection layer 5 is continuously destroyed by the laser beam 10 so that the face image 13 by the destruction portion 12 is formed. Formed.

(Preparation of Card Having Optical Diffraction Structure) FIG.
In the light diffraction structure transfer foil 20 of Example 2, the coating liquid for an adhesion layer having the following composition was applied to the upper surface of the light reflection layer 6 of the light diffraction structure transfer foil of Example 2 in a state where the adhesive layer 6 was not provided by a gravure reverse coating method. After coating to form an adhesive layer, a thickness of 0.7
6mm polyvinyl chloride sheet (2 white core sheets,
The light diffractive structure transfer sheet is adhered to the base sheet 14 of the object to be transferred composed of two transparent oversheets (four-layer laminated structure), and is supported from the protective layer 3 of the light diffractive structure transfer foil to the releasable resin layer 2. The body sheet 1 was peeled off, and a card 30 having an optical diffraction structure of Example 2 as shown in FIGS. 4 and 5 was produced. Composition of coating solution for adhesive layer Vinyl chloride-vinyl acetate copolymer 20 parts by weight Acrylic resin 10 parts by weight Solvent Ethyl acetate 20 parts by weight Solvent Toluene 50 parts by weight

Example 3 (Preparation of Light Diffraction Structure Transfer Foil) As shown in FIG.
A 25 μm-thick biaxially stretched transparent PET film (single-sided corona discharge treatment) was used, and a coating liquid for a release resin layer having the following composition was dried on the corona discharge-treated surface by a gravure reverse coating method. Was applied so as to have a thickness of 0.5 μm, thereby producing a support 1 on which the release resin layer 2 was laminated. Composition of coating solution for release resin layer Melamine resin 5 parts by weight Solvent Methyl alcohol 25 parts by weight Solvent Ethyl alcohol 45 parts by weight Cellulose acetate resin 1 part by weight Paratoluenesulfonic acid 0.05 part by weight

Next, a coating liquid for a protective layer having the following composition is applied onto the release resin layer 2 by a gravure reverse coating method so that the thickness after curing becomes 0.5 μm, and irradiation with ultraviolet rays is performed. Equipment (High pressure mercury lamp 2 with 160 W / cm output)
UV light was applied at a dose of 500 mJ / cm ² to cure the coating film, thereby forming the protective layer 3. Composition of coating solution for protective layer Polyurethane acrylate (prepolymer) 20 parts by weight Dipentaerythritol hexaacrylate 100 parts by weight 2-hydroxyethyl acrylate 5 parts by weight Photopolymerization initiator 1 part by weight Sensitizer 1 part by weight

Next, a coating solution for forming a light diffraction structure having the following composition was applied onto the protective layer 3 by a gravure rivers coating method so that the thickness when dried was 2 μm.
The resin layer was dried at 0 ° C. for 1 minute to form a resin layer for forming an optical diffraction structure. Composition of coating solution for forming optical diffraction structure layer Acrylic resin 40 parts by weight Melamine resin 10 parts by weight Solvent Cyclohexanone 50 parts by weight Solvent Methyl ethyl ketone 25 parts by weight

A hologram master is placed on a resin layer for forming the light diffraction structure, and the hologram master is placed at 150 ° C. and 50 kg / h.
After the hologram relief 8 was molded by applying heat and pressure under the condition of cm ² for 1 minute, the hologram master was peeled off to form the light diffraction structure forming layer 4 having the hologram relief 8.

Next, a 500-nm-thick thin film layer was formed on the hologram relief forming surface of the light diffraction structure forming layer 4 using aluminum (Al) by a magnetron sputtering method to form a light reflecting layer 5.

An adhesive layer coating solution having the following composition was applied on the light reflecting layer 5 by a gravure reverse coating method so as to have a dry thickness of 2 μm, and dried to form an adhesive layer 6. An optical diffraction structure transfer foil of Example 3 was produced. Composition of Coating Solution for Adhesive Layer Vinyl chloride-vinyl acetate copolymer 20 parts by weight Acrylic resin 10 parts by weight Solvent Ethyl acetate 20 parts by weight Solvent Toluene 50 parts by weight The light diffraction structure transfer foil 20 of Example 1 produced as described above.
The thickness configuration of each layer is as follows. Support sheet (25 μm) / Releasable resin layer (0.5 μm)
m) / protective layer (0.5 μm) / light diffraction structure forming layer (2 μm)
m) / light reflecting layer (500 °) / adhesive layer (2 μm)

Next, as shown in FIG. 2, the pulse light narrowed down from the laser light source 9 to a peak output of 10 kW / time width of 0.2 μS and a beam diameter of 100 μm is bonded to the light diffraction structure transfer foil 20 by the objective lens 11. The light is focused on the light reflection layer 5 from the layer 6 side, and a part of the light reflection layer 5 is continuously destroyed by the laser light 10, so that the face image 13 by the destruction portion 12 is obtained.
Was formed.

(Production of Card Having Optical Diffraction Structure) FIG.
As shown in the figure, a 0.76 mm-thick polyvinyl chloride sheet (two white core sheets and two transparent oversheets) was used.
The substrate sheet 14 of the transfer member composed of the layer stacking structure) is heated at 150 ° C. and 10 kg /
After the light diffraction structure transfer layer 7 of the light diffraction structure transfer foil 20 was transferred to the surface of the base material sheet 14 by heating and pressing under the condition of cm ² for 1 second, the release resin layer 2 and the support sheet 1 were separated. By peeling off, a card 30 having an optical diffraction structure of Example 3 as shown in FIGS. 4 and 5 was produced.

[0057]

As described in detail above, the method for manufacturing an article having an optical diffraction structure according to the present invention provides a method for manufacturing an article having an optical diffraction structure at a stage prior to transfer to an article to be transferred. The light reflecting layer in the crystal structure forming layer is irradiated with a laser beam, and a part of the light reflecting layer is destroyed to display a pattern, display of a pattern or the like, characters, recording of an image or the like on the light reflecting layer. Since it is formed, there is no fear of adverse effects on the object to be transferred due to the irradiation of laser light, that is, discoloration, deformation, damage, etc. of the object to be transferred due to heat. In addition, when setting the irradiation conditions of laser light, it is not necessary to consider the restrictions of each transfer object, so that the optimum laser light can be applied to different conditions depending on the lamination structure of the light diffraction structure transfer foil and the irradiation direction. By performing the irradiation, a recorded display on the light reflecting layer can be formed. Further, by using a pulse laser beam as the laser beam, the influence of heat on the light reflection layer can be reduced as much as possible, and damage to other portions of the light diffraction structure transfer foil can be prevented. Therefore, even for an object to be transferred using a material which is conventionally susceptible to heat, an article in which a light diffraction structure in which a display of a pattern, a pattern, or the like, a character, an image or the like is formed on a light reflecting layer is attached. It has become possible to manufacture and to develop a wide range of products.

In the method for producing an article having an optical diffraction structure according to the present invention, a pattern, a pattern, an image, or the like formed by a hologram or a diffraction grating formed on a light diffraction structure forming layer before the transfer to an object to be transferred. In addition to the display, before the transfer of the light diffraction structure transfer layer to the transfer target, as a second recording display, a new light reflection layer, a display of a pattern, pattern, etc., characters,
Since images and other records can be formed, it is possible to respond to different types of records and displays, such as variable information, for each light diffraction structure transfer layer. It can be performed efficiently. Also,
For this reason, even if a large number of light diffraction structure transfer foils on which the same hologram or diffraction grating is displayed, such as a pattern, a pattern, etc., are manufactured and stocked, the recording display of the light reflection layer portion is thereafter performed.
Since it can be formed by freely changing, even if a person who plans forgery, falsification, etc., makes a counterfeit or falsified product, a record display for judging the authenticity is added to the light reflection layer By changing the record display to the conventional product, countermeasures for counterfeiting and falsification can be taken in a short period of time.

[0059]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an optical diffraction structure transfer foil according to the present invention.

FIG. 2 is a cross-sectional view showing an embodiment in a state where laser light is irradiated on the light diffraction structure transfer foil according to the present invention.

FIG. 3 is a cross-sectional view showing an example of a state after irradiating a laser beam to the light diffraction structure transfer foil according to the present invention.

FIG. 4 is a sectional view showing an embodiment of an article having a light diffraction structure according to the present invention.

FIG. 5 is a plan view showing an embodiment of an article having a light diffraction structure according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 support 2 release resin layer 3 protective layer 4 light diffraction structure forming layer 5 light reflection layer 6 adhesive layer 7 light diffraction structure transfer layer 8 hologram relief 9 laser light source 10 laser light 11 objective lens 12 perforated part 13 face image 14 base sheet 20 light diffraction structure transfer foil 30 article having light diffraction structure

Continued on the front page F-term (reference) 2C005 HA02 HA10 HB02 HB03 HB10 JA15 JA18 JA19 JB02 JB08 JB09 KA24 KA37 KA48 LA11 LA19 LA20 LA22 LA30 2H049 AA07 AA33 CA05 CA28 2K008 AA13 BB00 DD02 EE04 FF03 FF27H17

Claims (2)

[Claims] 1. A light diffractive structure transfer foil (20) comprising a light diffractive structure forming layer (4) and a light reflecting layer (5) laminated on a support (1). In a method for manufacturing an article having a light diffraction structure to which a diffraction structure forming layer (4) and a light reflecting layer (5) are transferred, the light diffraction structure forming layer (4) and the light reflecting layer (5) are transferred to the article. A method of manufacturing an article having a light diffraction structure, wherein a part of the light reflection layer (5) is destroyed by irradiating the light diffraction structure transfer foil (20) with a laser beam (10) before. 2. The method according to claim 1, wherein the laser beam is a pulsed laser beam.