JPH11352863A - Hologram transfer foil and information carrying member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to judge whether an information carrying medium, such as securities, is genuine or not even if hologram foil is peeled by incorporating a colorless transparent fluorescent material which is hardly visible by visual observation into an adhesive layer. SOLUTION: The hologram transfer foil 10 is formed by successively laminating a hologram forming layer 14, a reflection layer 16 and the adhesive layer 18 on the surface of a transfer foil base layer 12. At this time, the adhesive layer 18 for adhesion to an information carrying base sheet, etc., is formed on the reflection layer 16. The material for forming the adhesive layer 18 is not particularly restricted, insofar as such material does not change the properties of the hologram forming layer 14 or attack the layer. The colorless transparent fluorescent material which is hardly visible by visual observation is incorporated into the adhesive layer 18. The colorless transparent fluorescent material which is hardly visible by visual observation is preferably an IR emitting fluorescent material. The IR emitting fluorescent material includes an IR visible conversion fluorescent material which is excited by IR light to emit visible light and a material which is excited by IR light to emit a longer wavelength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION It is widely practiced to adhere a hologram foil to an information-bearing medium such as securities to prevent forgery and falsification and to enhance the effect of preventing forgery and falsification. However, the hologram foil is peeled off due to long-term use, use under severe conditions, and the like, and the place for determining whether or not the information-bearing medium such as securities is genuine is lost and cannot be fulfilled. The present invention provides a hologram transfer foil that can prove whether or not an information-bearing medium such as securities is genuine even if the hologram foil is peeled off due to long-term use, use under severe conditions, and the like. And an information carrying medium.

[0002]

2. Description of the Related Art Although a hologram capable of reproducing a three-dimensional image or the like by using light interference requires a high level of manufacturing technology, it can be formed in the form of a seal, foil, or the like. It is attached to the surface of an information-bearing medium such as a compact disc, sporting goods, branded goods, ROM board, and the like, and is used as a means for determining whether an article is a genuine article or an unauthorized article based on the presence or absence of the article.

However, the hologram foil is peeled off due to long-term use or use under severe conditions, and the basis for determining whether or not the information carrying medium such as securities is genuine is lost, and the original function is lost. It often happens that it fails.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for determining whether an information-bearing medium such as securities is genuine even if the hologram foil is peeled off due to long-term use or use under severe conditions. An object of the present invention is to provide a hologram transfer foil and an information-carrying medium that can be verified.

[0005]

According to the present invention, there is provided a hologram comprising a transfer foil base sheet, a hologram forming layer, a reflective layer, and an adhesive layer. In the transfer foil, a hologram transfer foil is characterized in that a colorless and transparent fluorescent material that is difficult to recognize visually is mixed into the adhesive layer.

According to a second aspect of the present invention, there is provided the hologram transfer foil according to the first aspect, wherein the colorless and transparent fluorescent material which is difficult to recognize visually is an infrared-emitting fluorescent material. Things.

Further, in the third aspect, an adhesive layer is provided on the information-bearing medium base sheet on which printing or the like has been performed.
An information-carrying medium comprising a reflective layer and a hologram-forming layer, wherein the adhesive layer is mixed with a colorless and transparent fluorescent material which is difficult to recognize visually.

According to a fourth aspect of the present invention, there is provided the information carrying medium according to the third aspect, wherein the colorless and transparent fluorescent material which is difficult to visually recognize is an infrared light emitting fluorescent material. It was done.

[0009]

Embodiments of the present invention will be described below. As shown in FIG. 1, the hologram transfer foil (10)
Is formed by sequentially laminating a hologram forming layer (14), a reflecting layer (16), and an adhesive layer (18) on the surface of a transfer foil base sheet (12).

[0010] The transfer foil base layer (12) according to the present invention.
Can support each layer constituting the hologram transfer foil (10) at the time of manufacturing, and can be a protective layer because it is the outermost layer at the time of use. As such a transfer foil base layer (12), a transparent resin film such as a vinyl chloride resin or a polyester resin can be used.

Next, a hologram forming layer (1) having a hologram pattern formed on the transfer foil base layer (12)
The method 4) is required to be made of a resin that can form a film, has good embossing moldability, hardly causes press unevenness, and can obtain a bright reproduced image.

The hologram-forming layer may be formed of a thermoplastic resin such as a polycarbonate resin, a polystyrene resin, or a polyvinyl chloride resin, or a copolymer or a mixture thereof, an unsaturated polyester resin, a melamine resin, or an epoxy resin. Thermosetting resins such as (meth) acrylate resins such as urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate; These copolymers or mixtures, and thermoformable materials having radically polymerizable unsaturated groups can be used.

Then, the material constituting the hologram forming layer is applied on the transfer foil base layer (12) to a thickness of several μm by a coating forming method such as a gravure coating method, and dried to form fine irregularities constituting the relief hologram. A hologram pattern is formed by heating and pressing a nickel press plate having a pattern formed thereon onto the hologram forming layer 3.

The hologram pattern may be a pattern that can be visually read by irradiating white light, but is preferably a pattern that can be read using monochromatic light of a specific wavelength from the viewpoint of preventing fraud. .

Next, the reflection layer (16) formed on the hologram formation layer (14) is a layer that reflects an incident light beam. As a material for such a reflective layer, metals such as aluminum, silver, gold, and tin can be used. These films shine metallic colors and are impermeable.

However, the reflective layer merely shines in a metallic color, and is slightly inferior in decorativeness.

The reflection layer (16) may be formed of a transparent thin film having a different refractive index from the hologram forming layer.

Here, the transmissive thin film is a thin film that exhibits light transmissivity and generates light reflection at an interface due to a difference in refractive index from the hologram forming layer, and is used for reproducing a hologram image on the hologram forming surface. In addition, the transmissive reflective layer (16)
The hologram forming layer (refractive index n
= 1.3 to 1.6) is preferable for improving the decorative property. For example, the following inorganic materials can be used.

That is, for example, Sb_TwoS_Three, Fe_TwoO_Three,
TiO_Two, CdS, CeO_Two, PbCl_Two, CdO, S
b_TwoO_Three, Bi_TwoO_Three, ZnS, WO_Three, SiO, In
_TwoO_Three, PbO, Ta_TwoO_Three, ZnO, CaO.SiO
_Two, ZrO, Cd_TwoO_Three, Al_TwoO_ThreeEtc.
EB deposition method, vacuum deposition on the hologram formation layer
Method, sputtering method, reactive sputtering method, Io
It can be formed by film forming means such as plating method.
Wear.

Next, on the reflective layer (16), an adhesive layer (1) for adhering to the information carrying medium base sheet (20) and the like.
8) is formed. The material for forming the adhesive layer (18) is not particularly limited as long as it does not alter or invade the hologram forming layer (14). For example, butyl rubber-based, natural rubber-based, silicon-based, polyisobutyl-based adhesive components, alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl monomer and other aggregating components, unsaturated carboxylic acids, hydroxyl group-containing monomers, An adhesive to which additives such as a modifying component represented by acrylonitrile and the like, a polymerization initiator, a plasticizer, a curing agent, a curing accelerator, an antioxidant and the like are added as necessary can be applied.

The adhesive layer (18) contains a colorless and transparent fluorescent material which is difficult to recognize visually. As the colorless and transparent fluorescent material that is difficult to visually recognize, an infrared-emitting fluorescent material is preferable. The infrared-emitting fluorescent agent is an infrared-visible conversion fluorescent agent that emits visible light when excited by infrared light,
nm) and longer wavelengths (980-1020 nm)
Some emit light.

The former infrared-visible conversion fluorescent agent is a phosphor having a very special excitation mechanism, and excites visible light emission by using a plurality of infrared photons having a small energy. There are two types of mechanisms, one by multi-step excitation in the activator ion and the other by multiple resonance energy transfer from the sensitizer, each enabling high excitation. The first type is observed in many host crystals using Er ³⁺ or Ho ³⁺ as an activator, and the latter type is a sensitizer Yb ³⁺ that absorbs infrared rays and emits light by multi-step energy transfer. The central Er ³⁺ , Tm ³⁺ , Ho ^{3+ and the} like are excited to a high level. YF ₃ : Yb + Er, YF ₃ : Yb + T
m, BaFCl: Yb + E r can be used.

Excitation by infrared light (800 nm)
Light emitting at longer wavelengths (980-1020 nm)
For example, if the composition is LiNd_0.9Yb_0.1P_FourO₁₂, Li
Bi _0.2Nd_0.7Yb_0.1P_FourO_12,Nd_0.9Yb_0.1
Nd_Five(MoO_Four)_Four,NaNd_0.9Yb_0.1P_FourO_12,
Nd_0.8Yb_0.2Na_Five(WO_Four)_Four, Nd_0.8Yb
_0.2Na_Five(Mo_0.5W_0.5O_Four)_Four,Ce_0.05Gd_0.05
Nd_0.75Yb_0.15Na_Five(W_0.7Mo_0.3O_Four)_Four, N
d_0.9Yb_0.1Al_Three(BO_Three)_Four,Nd_0.9Yb _0.1A
l_2.7Cr_0.3(BO_Three)_FourNd_0.6Yb_0.4P_FiveO
_14,Nd_0.8Yb_{0. Two}K_Three(PO_Four)_TwoEtc. can be used
You.

The hologram transfer foil (10) thus produced can be adhered to various information-bearing medium base sheets (20) via an adhesive layer (18). For example, various cards such as identification cards, credit cards,
Video cassettes, compact discs, sports equipment,
It is attached to the surface of an information-bearing medium such as a branded product or a ROM board, and is used as a means for determining whether an article is genuine or illicit based on the presence or absence.

FIG. 2 shows a state in which the hologram transfer foil is adhered to the information carrying medium. Information bearing media base sheet such as securities such as stock certificates and bonds, and credit cards (20)
Hologram transfer foil (10) through an adhesive layer (18)
Are adhered by applying heat, pressure or the like.

Here, the information-bearing medium to which the hologram transfer foil of the present invention thus formed is bonded can be used for a long time.
Even if the hologram foil is peeled off due to use under severe conditions, a part of the adhesive layer (18) remains on the information-bearing medium base sheet (20). When irradiated with ultraviolet light, it emits fluorescent light, indicating that the hologram transfer foil (10) was present there, and it can be proved that the information-bearing medium such as securities is genuine.

Here, in the present invention, a colorless and transparent fluorescent material which is difficult to visually recognize is used as the fluorescent material because the fluorescent material has a security function, and the presence of the fluorescent material is a right to know a specific secret. Need to be limited to those who have However, if it is colored, its existence is easily known to the general public, and there is a risk of being forged or tampered with. That is, in order to avoid the danger, a colorless and transparent fluorescent material which is difficult to recognize visually is used.

[0028]

As described above, the present invention has the following effects. That is, the present invention provides a method for forming an adhesive layer on an information-bearing medium base sheet even if the hologram transfer foil adhered to an information-bearing medium such as securities is peeled off due to long-term use or use under severe conditions. The remaining information can be proved by illuminating with an infrared ray or the like whether or not the information-bearing medium such as securities is genuine.

Moreover, since a colorless and transparent fluorescent material which is hardly visually perceived is used as the fluorescent material, especially if an infrared-emitting fluorescent material is used, its existence is not easily known to ordinary people, so that it is forged or falsified. Risk is extremely low. Therefore, the present invention exerts an excellent practical effect when used as security for securities and various cards.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section of a hologram transfer foil according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a cross section of an information carrying medium according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 hologram transfer foil 12 ‥‥ transfer foil base layer 14 形成 hologram forming layer 16 ‥‥ reflective layer 18 ‥‥ adhesive layer 20 ‥‥ information carrying medium base sheet 22 ‥‥ information carrying medium

Claims (4)

[Claims] 1. A hologram transfer foil comprising a transfer foil base sheet, a hologram-forming layer, a reflective layer, and an adhesive layer, wherein the adhesive layer contains a colorless and transparent fluorescent material which is difficult to recognize visually. A hologram transfer foil, characterized in that: 2. The hologram transfer foil according to claim 1, wherein the colorless and transparent fluorescent material which is difficult to recognize visually is an infrared-emitting fluorescent material. 3. An information-bearing medium having an adhesive layer, a reflective layer, and a hologram-forming layer on an information-bearing medium base sheet on which printing or the like has been applied, wherein the adhesive layer has a colorless and transparent fluorescent material which is difficult to recognize visually. An information-bearing medium characterized by containing a material. 4. An information-carrying medium according to claim 3, wherein the colorless and transparent fluorescent material which is difficult to recognize visually is an infrared-emitting fluorescent material.