JPH11227368A - Information display medium, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information display medium which does not spoil printing information on the medium, and is equipped with a decorative effect of a reflective type OVD, a verification function, and a copying preventive effect, and its manufacturing method. SOLUTION: On an information part 2 on a base material 1 having at least image information or character information, an OVD 3 wherein a hologram or a diffraction grating is formed, is provided for this information display medium, and the OVD 3 is formed into a dot-shape, and the dot-shaped OVD 3 is formed in such a manner that the dot area is 0.25-4 mm<2> , and the occupied area is in a range of 30-70%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information display medium on which an image is formed by transferring it to, for example, a credit card, securities, certificates, etc., and in particular, information formed by forming an OVD image composed of a hologram or a diffraction grating. The present invention relates to a display medium and a method for manufacturing the same.

An OVD (Optical Variable Device) such as a hologram image or a diffraction grating image capable of expressing a stereoscopic image or a special decoration image using light interference has been developed. OVD technology of these holograms and diffraction gratings requires advanced manufacturing technology and is difficult to duplicate, so credit cards, ID cards,
It has been used for cards such as prepaid cards. Recently, attention has been paid to the fact that reflection type OVD images cannot be reproduced by color copying, and they are frequently used in paper tickets such as gift certificates, checks, bills, stock certificates, admission tickets, and various certificates. ing. Furthermore, due to its high decorativeness, it is often used for packaging materials, books, pamphlets, POPs, and the like. In the present specification, techniques for optically expressing an image such as the hologram image and the diffraction grating image are collectively referred to as OVD.

[0003] As a means for attaching these OVDs to articles, a method has conventionally been adopted in which transfer is formed using a transfer foil. This type of transfer foil is known to have a configuration in which a release layer, a relief layer having a hologram or an image pattern of a diffraction grating formed thereon, an OVD layer composed of a reflective layer, and an adhesive layer are sequentially laminated on a substrate sheet. Have been. These OVD patterns (holograms and diffraction grating patterns) engraved on the transfer foil are copied in large amounts by a well-known method of duplicating a fine concavo-convex pattern on a nickel press plate and heating and pressing the relief layer. I have. on the other hand,
As a method of transferring and attaching the transfer foil or the like copied in large quantities, heat transfer using a hot stamp is generally used.

Unlike a hologram that can reproduce a three-dimensional image, a plurality of types of simple diffraction gratings are arranged in a small area to form pixels, and a diffraction grating image such as a grating image or a pixelgram that expresses an image is also used. A large number of copies are made in the same manner as holograms, and they are used by sticking to some credit cards, securities, certificates, and the like as means for preventing forgery.

In particular, a reflection type OVD having a metallic luster has a high light reflection efficiency, has a high decorative effect, and allows the OVD to be confirmed at a glance, so that its authenticity can be easily confirmed. Also, when copying with a color copier,
Since that part is reproduced in black and it is impossible to reproduce OVD, it is increasingly used as a means for preventing color copying.

[0006] On the other hand, the method of transferring and attaching the OVD transfer foil having the OVD copied in large quantities involves disposing the OVD transfer foil between a heated stamp of metal and an object to be transferred.
In general, a hot stamping method in which a D transfer foil is pressed against an object to be transferred by engraving is used, and a roll transfer method using a heated roll instead of a heated engraving is also used.

However, in a conventional information medium with a reflective OVD, the information on the medium cannot be applied because the information on the medium is hidden because the OVD is attached to a part or the entire surface of the medium. There was a problem.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an information display medium which does not impair the print information on the medium and has the decoration effect, verification function, and copy protection effect of the reflective OVD, and a method of manufacturing the same. The purpose is to:

[0009]

In order to achieve the above object, according to the present invention, a halftone dot O composed of fine dots is provided.
It is characterized in that VD information is formed on print information on a medium, thereby enabling OVD to be formed without hiding print information on the medium.

That is, claim 1 is an information display medium having an OVD in which a hologram or a diffraction grating is formed on an information portion on a base material having at least image information or character information. An information display medium characterized by being formed in a halftone dot shape.

According to a second aspect, in the information display medium according to the first aspect, the halftone dot OVD has a dot area of 0.25 mm ^{2 to} 4 mm ² and an occupied area of 30% to 7 mm.
It is characterized by being formed in a range of 0%.

A third aspect of the present invention relates to an OVD forming layer in which a release layer / relief hologram or a diffraction grating is formed on at least a substrate having image or character information /
An OVD transfer ribbon having a structure in which at least a reflective thin film layer / adhesive layer formed on a relief surface of a VD formation layer is laminated is transferred in a dot shape with a small area by a thermal head to form an OVD halftone image. A method for manufacturing an information display medium characterized by the following.

According to a fourth aspect of the present invention, in the method for manufacturing an information display medium according to the third aspect, the OVD halftone image has a dot area of 0.25 mm ^{2 to} 4 mm ² and an occupied area of 30% to 30%. It is characterized by being transferred in a range of 70%.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of the information display medium of the present invention. First, an information display medium in which an OVD section 3 is formed by dot-shaped halftone dots on an information section 2 drawn on a base material 1. When observing this medium, it is possible to easily confirm three pieces of information of the information drawn on the OVD itself, together with the print information 2 (displayed by TOP) and the image information drawn by the OVD dot 3 (displayed by OK). Also,
The OVD information that reflects light enhances the decorative effect of the present information display medium and provides a highly designable medium, while the information display medium has a high forgery prevention effect such as color copy prevention.

[0015] dots OVD in the present invention does not impair the printing information 2 on the medium, and an image drawn on OVD is necessary large enough to visually confirm, 0.25 mm ² ~
A size of 4 mm ² is preferable. If the size is less than 0.25 mm ² , the OVD image is difficult to see. If the size is 4 mm ² or more, the print information on the medium is hidden, making it difficult to confirm the information. Therefore,
The area occupied by the halftone dots is preferably 30% to 70% for the same reason.

FIG. 2 is a sectional view showing an example of the configuration of a reflective OVD transfer ribbon according to the information display medium of the present invention.
A peelable layer 22 is formed on a support 21,
The OVD layer 23 is formed below. Further, a back coat layer 25 is formed on the back surface of the support 21 (the surface opposite to the surface on which the peelable layer 22 is formed). This configuration example shows the configuration of the relief type OVD,
The D layer 23 includes a relief hologram or a relief layer 23a having a diffraction grating pattern and a reflective layer 23b provided on a surface on which the relief hologram or the diffraction hologram is formed. The adhesive layer 2 is provided under the reflective layer 23b.
4 are formed.

Hereinafter, the constituent materials together with the role of each layer will be described in detail. The support 21 is required to have heat resistance and strength not to be softened and deformed by heat and pressure in thermal transfer, and may be made of polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, polyethylene terephthalate, or polyethylene. It is possible to use one selected from synthetic resins such as naphthalate, polypropylene, and polyvinyl alcohol, natural resins, paper, synthetic paper, and the like, or a complex selected from the above and combined. Further, the thickness is preferably about 2 to 25 μm in consideration of operability and workability.

The release layer 22 may be made of any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin as long as it can be easily peeled off from the support 21. In consideration of the foil breaking property, a thermoplastic resin is preferable. Examples include thermoplastic polyacrylate resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, chlorinated polypropylene resins, epoxy resins, polyester resins, nitrocellulose resins, and styrene. An acrylate resin, a polyether resin, a polycarbonate resin, or the like can be used alone or in combination. In addition, in consideration of the foil-cutting property and abrasion resistance, various waxes such as petroleum wax and vegetable wax, metal salts of higher fatty acids such as stearic acid,
A lubricant such as silicone oil, an organic filler such as Teflon powder, polyethylene powder, silicone fine particles and acrylonitrile fine particles, and an inorganic filler such as silica fine particles can also be added. The release layer 2
No. 2 need not be provided when the support 21 itself has releasability or when the support 21 itself has been subjected to a release treatment. Furthermore, it is also possible to provide a protective layer after transfer in order to impart frictional properties.

The OVD forming layer 23 is a layer for recording a hologram or a diffraction grating, and includes a relief hologram recorded on the surface as an uneven relief,
This is a layer having a well-known light diffraction image such as a volume hologram in which an image is three-dimensionally recorded in the thickness direction.

Among them, a relief type is preferable in consideration of mass productivity and cost. That is, a relief type OVD (hologram or diffraction grating) having a fine concavo-convex pattern is produced by an optical photographing method, and a nickel press plate in which the pattern is duplicated by an electroplating method is produced using the OVD as a master plate. Thereafter, a method of heating and pressing a press plate on the relief layer to copy the concavo-convex pattern is a method in which the copy can be obtained in large quantities and at low cost.
When this relief type OVD is used, it is preferable to provide a reflection layer having a different refractive index from the relief surface in order to increase diffraction efficiency.

Therefore, the relief forming layer 23a is required to have a performance capable of being molded by a press plate, and the material may be any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin. good. Examples include thermoplastic resins such as acrylic resins, epoxy resins, cellulosic resins, and vinyl resins, and urethanes obtained by adding a polyisocyanate as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group as a crosslinking agent. Resins, thermosetting resins such as melamine resins and phenolic resins, and ultraviolet or electron beam curable resins such as epoxy (meth) acrylic and urethane (meth) acrylates can be used alone or in combination. In addition, any other than the above can be used as long as an OVD image can be formed.

As the reflection layer 23b, a high-refractive-index material that reflects light can be used. However, metals such as Al, Sn, Au, Ag, and Cr, which have excellent light reflectivity, and their oxidized materials are used. It is preferable to use an inorganic material such as a material. Furthermore, these materials can be used alone or as a composite laminate, and are formed by a known thin film forming technique such as a vacuum evaporation method and a sputtering method. The thickness is preferably from 50 to 10,000 from the problem of reflectance. If it is possible to obtain reflection efficiency, gravure coat, roll coat, die coat, and other materials such as organic, organic-inorganic composite, and organic material with inorganic filler dispersed
1000 ° to 100000 ° (0.1 μm to 10 μm) by a known coating method or printing method such as screen printing.
m) It is also possible to form. It is to be noted that the present invention is not limited to these, and any material other than the above can be used as long as the material has light reflectivity.

The adhesive layer 24 is formed of the reflective layer 23b and the substrate 1
Alternatively, a performance of bonding a non-transfer medium is required. The material is preferably a thermoplastic resin, and a simple substance or a copolymer of an acrylic resin, an epoxy resin, a polyester resin, a vinyl resin or the like can be used alone or in combination, but is not limited thereto. In addition, in consideration of blocking prevention and foil breaking properties, various waxes such as petroleum wax and vegetable wax, metal salts of higher fatty acids such as stearic acid, lubricants such as silicone oil, Teflon powder, polyethylene powder, silicone Organic fillers such as fine particles and acrylonitrile-based fine particles and inorganic fillers such as silica fine particles can also be added.

The back coat layer 25 may be a commonly used one as long as it is configured to prevent the transfer ribbon from sticking to the thermal head. Examples of the binder include acrylic resin and epoxy resin. Resin,
Cellulose resin, thermoplastic resin such as vinyl resin,
Addition of polyisocyanate as a crosslinking agent to acrylic polyol or polyester polyol having reactive hydroxyl group, thermosetting resin such as crosslinked urethane resin, melamine resin, phenolic resin, epoxy (meth) acryl, urethane (meth) acrylate Or an ultraviolet or electron beam curable resin such as a silicone resin can be used alone or in combination. Those to which various surfactants as slip agents, lubricants such as polyethylene wax and silicone wax, and fillers such as talc are added as needed can be used. In addition, any material other than the above can be used as long as it can prevent sticking to the thermal head.

The OVD transfer ribbon shown in FIG. 2 will be described. In this example, a transparent polyethylene terephthalate film of 12 μm was used as the support 21.

The release protective layer 22 of the transfer ribbon is made of O
In order to more effectively transfer the VD layer 23 to a transfer target (not shown), the composition is provided in consideration of the releasability from the support and the foil cutting property, and has the following compounding ratio. By gravure printing method, drying temperature 110 ° C, thickness 0.8
μm. <Composition of the peelable protective layer> Acrylic resin 30 parts Polyethylene powder 1 part Toluene 40 parts Methyl ethyl ketone 40 parts Methyl isobutyl ketone 20 parts

In this example, the relief layer 23a was formed by a gravure printing method at a drying temperature of 110 ° C. and a thickness of 0.5 μm using a composition having the following compounding ratio. <Composition of Relief Layer> Vinyl chloride-vinyl acetate copolymer: 25 parts Urethane resin: 10 parts Methyl ethyl ketone: 70 parts Toluene: 30 parts In addition, press molding at a plate surface temperature of 165 ° C. is performed on the relief layer 23a. Formed. After that, the reflective layer 23b was provided with Al to a thickness of 300 to 500 ° by a vacuum evaporation method.

The adhesive layer 24 is formed by gravure printing at a drying temperature of 110 ° C. and a thickness of 1.0 μm. <Composition of adhesive layer> Vinyl chloride-vinyl acetate copolymer: 30 parts Polyester resin: 20 parts Methyl ethyl ketone: 50 parts Toluene: 50 parts

The back coat layer 25 formed on the back surface (the surface opposite to the surface on which the releasable protective layer is formed) on the support 21 prevents sticking when transferring with a thermal head, and provides a transfer ribbon. Is a layer for preventing sticking to a thermal head, and a composition having the following compounding ratio is formed by a gravure printing method at a drying temperature of 110 ° C. and a thickness of 1.0 μm. <Composition of the back coat layer> Vinyl resin: 50 parts Isocyanate curing agent: 5 parts Silicone WAX: 1 part Methyl ethyl ketone: 50 parts Toluene: 50 parts

Next, a base material having information will be described. The substrate 1 was a white PVC card of 54 mm × 85 mm, and a pattern and character information were printed by a known thermal transfer card printer. Hereinafter, the base material to which the print information is added is referred to as a print card.

The information display medium of the present invention was produced using the OVD transfer ribbon and the printing card obtained as described above, and the transfer of the ribbon was performed by a known thermal transfer printer. Further, as shown in FIG. 3, the transfer was performed with a dot of 1 mm square per dot so that the occupied area was 50% to form an OVD portion.

An information display medium having an OVD image produced by the above method can be used without hiding information on a print card.
VD is formed and OVD together with the information on the card
An information display medium having a high design property was obtained because a unique sense of luminance and chaining of images and colors depending on the viewing direction were observed. On the other hand, when this medium was color-copied, the OVD portion was reproduced in black, and it could be easily judged to be a fake.

[0033]

As described above, the information display medium of the present invention has a dot-like OVD without hiding the information on the base material.
(Holograms and diffraction gratings). Thereby, the information on the base material, the information by the OVD halftone dot and the information drawn on the OVD can be checked at a time,
OVD provides a medium with a high design effect with a light decoration effect. Also, when color copying was performed, the OVD halftone dots became black halftone dots, and had a copy protection effect that could be easily distinguished from OVD and fake, thereby achieving a higher forgery prevention effect. Furthermore, by using an OVD ribbon, it is possible to easily form an OVD halftone dot in an arbitrary shape.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an information display medium of the present invention in a plane.

FIG. 2 is an explanatory view showing a configuration example of an OVD transfer ribbon according to the information display medium of the present invention in a cross section.

FIG. 3 is an enlarged view of an OVD halftone dot according to the information display medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Print information 3 ... OVD part 21 ... Support 22 ... Releasable protective layer 23 ... OVD forming layer 23a ... Relief forming layer 23b ... Reflective thin film layer 24 ... Adhesive layer 25 ... Back coat layer 32 ... Printing Information 33 ... OVD dot

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Atsushi Kijima 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Kiyoshi Horie 1-1-5-1 Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (4)

[Claims] An information display medium having an OVD in which a hologram or a diffraction grating is formed on at least an information portion on a base material having image information or character information, wherein the OVD is formed in a halftone dot shape. An information display medium characterized by being performed. 2. The method according to claim 2, wherein the halftone dot OVD has a dot area of 0.2.
5mm ^{2 to} 4mm ² occupying 30% to 70%
The information display medium according to claim 1, wherein the information display medium is formed in the range of: 3. An OVD forming layer in which a release layer / relief hologram or a diffraction grating is formed on a substrate having at least image or character information / a reflective thin film formed on a relief surface of the OVD forming layer A method for manufacturing an information display medium, characterized in that an OVD transfer ribbon having at least a layer / adhesive layer is transferred in the form of a dot having a small area by a thermal head to form an OVD halftone image. 4. The halftone image has a dot area of 0.25 mm.
4. The method for manufacturing an information display medium according to claim 3, wherein the transfer is performed so that the occupied area is ^{2 to 4} mm ² and the occupied area is 30 to 70%.