JP2001293982A - Information recording medium and information recording card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the function to prevent forgery and the like from being committed beyond its existing level by imparting relevancy to other information contained in a base, when a light diffraction structure of a hologram or the like is used by sealing it for the purpose of preventing an unlawful act from being committed. SOLUTION: A hologram seal 6 is laminated on a base 2 and the function to prevent forgery can be further enhanced by imparting information relevant to intrinsic information per base or/and intrinsic information per hologram to the record 65a by the variation of a reflective layer 65 as a lower layer of a hologram layer 64, and preferably storing a dye image 66a or a pigment image 66b in the lower layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffractive structure (typically, a hologram) provided on a base material, and furthermore, a second information obtained by a change in a light reflecting layer constituting the light diffractive structure. The present invention relates to an information recording medium and an information recording card which are more difficult to prevent forgery by having.

[0002]

2. Description of the Related Art Some information recording media on which various information are recorded can be exchanged for expensive money, such as securities, or they are expensive. Even if they are not, there are credit cards that can be economically expensive if used improperly. In each case,
Unauthorized persons such as "counterfeiting" that fake counterfeit goods as genuine and "authorization" that obtains the genuine article and alters it improperly continue.

One of the measures against counterfeiting and alteration is
A hologram seal is attached as a certificate stamp. The hologram is used in the form of a small seal because it has a fine pattern and requires a high level of technology for manufacturing. The hologram seal in the present specification can be roughly classified as long as it can adhere a light diffraction structure to an appropriate base material. For example, the base material, the light diffraction structure, the light reflective layer, and the adhesive layer are From a transfer foil consisting of a sequentially laminated label form or a base material, a release layer, a primer layer, a light diffraction structure layer, a light reflective layer, and a heat-sensitive adhesive layer, a transfer consisting of each layer after the release layer The layer is peeled off, or the substrate, the peeling layer, the primer layer, the light diffraction structure layer, the light reflective layer, the heat-sensitive adhesive layer, and the pressure-sensitive adhesive layer are sequentially laminated, and it is going to peel off from the adherend. Then
There is a brittle label where the interface between the substrate and the release layer, and in some cases, the light diffraction structure layer is partially destroyed, and in each case, the light reflective layer is partially removed, etc.
Information other than the hologram is held.

At present, to manufacture a hologram seal,
After irradiating a curable resin such as a photosensitive resin with interference light of a laser beam to generate irregularities, or to change the refractive index of light inside, or to obtain a hologram by copying using an irregular mold, etc. , Metallic luster layer such as aluminum thin film on uneven surface,
Or by laminating a transparent layer with a different refractive index of light as a light reflective layer from the cured resin that generated the hologram,
The hologram is used with enhanced visibility, and usually, for the purpose of further improving durability, a protective layer is formed of a curable resin composition containing a curable resin as a main component.

Actually, considering the convenience in the manufacturing process,
A protective layer formed of an ionizing radiation-curable resin, for example, with a releasable resin layer interposed on a support sheet, a primer layer, if necessary, a light diffraction structure layer (= hologram layer or diffraction grating layer), light reflectivity Layer, and a transfer sheet in which an adhesive layer and the like are sequentially laminated and formed, on a base material such as a card by transfer, a protective layer, a primer layer, a light diffractive structure layer, a light reflective layer, and an adhesive, if necessary, from above. In many cases, a layer in which agent layers are sequentially laminated is obtained (JP-A-10-187046).

Meanwhile, in the hologram seal described above, the picture is recorded by a diffraction grating containing picture information, and is itself very precise, and it is extremely difficult to imitate the same thing. For this reason, a hologram sticker is widely used because it is difficult to forge, and there are quite a few cases where it is used for a credit card.

[0007] However, a large number of hologram seals are common to credit cards of the same company. Therefore, if it is proof that the hologram sticker is genuine, the idea is to illegally obtain a credit card, peel off the hologram sticker, and stick it on an illegally created card base material. .

In connection with this, Japanese Patent Publication No. 6-85102 and Japanese Patent Publication No. 6-90590 disclose, in addition to the first information included in the hologram, the second information by processing the reflection layer. Although it is described that the difficulty of counterfeiting the hologram is increasing, only information such as letters, symbols, and figures is given as the second information,
No relevance to other information on the substrate or the like is mentioned.

Similarly, JP-A-2000-47555 and JP-A-2000-47556 disclose pictures, patterns, characters, images (for example, face photographs) other than hologram pictures, and machine-readable bars. Code, OCR
It is described that characters, OMR, and the like are preferably formed by using a pulse laser, but also does not mention relevance to other information on a substrate or the like.

[0010]

SUMMARY OF THE INVENTION In the present invention, when an optical diffraction structure such as a hologram is used as a seal for the purpose of preventing fraud, the ability to prevent forgery and the like is reduced by using other information on a base material or the like. The goal is to further increase the relevance by providing a relationship with

[0011]

According to our study, an optical diffraction structure such as a hologram is recorded on a substrate to which the hologram or the like is to be attached, which is different from the optical diffraction structure such as a hologram. It has been found that the above problem can be solved by recording information associated with information unique to each base material and / or (2) information unique to each light diffraction structure. Was.

According to a first aspect of the present invention, a light diffraction structure comprising at least a light reflective layer and a light diffraction structure layer is embedded in a base material so as to be observable from above the base material, or is laminated. Laminated on a base material, the base material has recorded therein information unique to each base material, and the light reflective layer has information associated with the information unique to each base material. Are recorded by changing the light-reflective layer. The second invention is characterized in that at least a light-reflective layer and a light-diffraction structure layer comprising a light-diffraction structure layer are embedded in the base material so as to be observable from above the base material, or are stacked on the base material. The present invention relates to an information recording medium, wherein information unique to each light diffraction structure is recorded on the light reflective layer by a change in the light reflective layer. According to a third aspect of the present invention, the light diffraction structure including at least the light reflective layer and the light diffraction structure layer is embedded in the base material so as to be observable from above the base material, or is laminated on the base material. It is laminated on, the substrate has recorded therein information unique to each substrate, the light reflective layer, information associated with information unique to each substrate, and one The present invention relates to an information recording medium characterized in that information unique to each light diffraction structure is recorded by changing a light reflective layer. A fourth invention relates to the information recording body according to any one of the first to third inventions, wherein further information is recorded between the substrate and the light diffraction structure. . A fifth invention relates to the information recording card according to any one of the first to fourth inventions, wherein the base material has a portable card size.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information recording card according to the present invention applied to a card such as a bank card or a credit card will be described as an example. In this specification, a card is
Industrially and commercially negotiated, 54mm x 8
It has a portable size of about 6mm and has an ID (= I
D), etc., which have some proof function. It should be noted that the present invention is not limited to a credit card, and the light diffraction structure is shown by an example using a hologram as a typical example, but is not limited to a hologram.

An information recording card 1 shown in FIG. 1 is an example of a credit card. In addition to characters such as a card name and an expiration date item on a base material 2, a design determined for each card type, and the like are shown. 3 shows information unique to each card, that is, a card number which is information unique to each base material, the name of a card holder, and the like, and is embossed by embossing. Character 4 (expiration date is also formed of embossed characters) and magnetic recording layer 5 (often concealed) are formed.
In addition, the card has a hologram sticker 6 which is guaranteed to be genuine and is attached to prevent forgery. In addition, although not shown, some credit cards have a concealing layer formed to make the magnetic recording layer invisible.

A print 3, an embossed character 4, and a magnetic recording layer 5 are usually provided in the case of a card.
It is not always necessary to arrange them all, but considering the function of the current card, the magnetic recording layer 5 is at a minimum.
And an IC module or / and an optical recording layer may be provided in place of the magnetic recording layer 5, and two or three of the magnetic recording layer, the IC module, and the optical recording layer may be provided. May be provided.

[0016] Logos and pictures such as card names for distinguishing cards issued from the same credit company of various types have lower priority than the magnetic recording layer and the IC module, but are provided in practical use. And for credit card applications, it should have embossed characters that may actually be used.

The card 1 shown in FIG.
FIG. 2 shows a cross section taken along the line. FIG. 2 mainly shows a position where the hologram seal 6 is laminated, and FIG.
(A) shows a mode in which a hologram seal 6 is laminated on a card base material 2 and the hologram seal 6 is applied to the surface of a half-finished card by a transfer method. In FIG. 2B, a transparent sheet 2a called an oversheet is the uppermost layer near the surface of the card base material, and a core sheet 2b is laminated thereunder,
The hologram seal 6 is laminated between the core sheet 2b and the oversheet 2a. In this form, the hologram seal 6 is previously attached to either the core sheet 2b or the oversheet 2a in the process of completing the card base material, or when the core sheet 2b and the oversheet 2a are attached, The hologram seal is applied depending on whether the hologram seal 6 is interposed.

In consideration of use as a card, the hologram seal 6 is preferably formed so as to have a thickness of 8 μm or less as a whole, more preferably 6 μm or less.

FIG. 3A shows an example in which the present invention is applied particularly to the hologram seal 6. In FIG. 3A, a vertically long rectangular hologram seal 6 has a hologram image 7 (hologram image itself is not shown) formed in an entire region surrounded by a peripheral frame line, and the center is slightly upward. Forms an image area 8 in which a face photograph is recorded and formed as an aggregate of halftone dots of different sizes due to a change in the light reflective layer of the hologram seal 6.

In the lower part of the hologram seal 6 shown in FIG. 3A, information 9 associated with information unique to each base material 2 of the card 1 is stored in the light-reflective layer of the hologram seal 6. Is formed. In the illustrated example, the information 9 is the same as the card number represented by the embossed characters 4 on the base material 2 and the name of the card holder. Further, at the upper right of the hologram seal 6, a hologram seal 6
, That is, information unique to one hologram seal is recorded and formed by a change in the light reflective layer of the hologram seal 6.

FIG. 3B shows an example of a hologram sign panel in which the present invention is applied not to a hologram seal but to a sign panel often provided on the back of a card. Therefore, in one card, FIG.
3A may be laminated on the front and back of the card. In FIG. 3B, the horizontally long hologram sign panel 11 has a basic structure
Similarly to the hologram seal shown in FIG. 3A, a hologram image 12 (hologram image itself is not shown) is formed in the entire region surrounded by the frame line. The cardholder's own signature 13
The difference is that the hologram is recorded and formed by a change in the light reflective layer.

In a credit card or the like, the signature 13
However, if the signature 13 is formed only on the signature panel 11, the character of the signature 13 is information unique to one hologram seal, but if there is another signature panel with a handwritten signature on the card, The signature 13 recorded and formed by the change in the light reflective layer of the hologram is the card 1
It can be said that the information is associated with information unique to each base material 2.

With reference to two examples of the hologram seal 6 and the sign panel 11, it has been described that information other than the hologram is recorded in the folded hologram seal structure by changing the light reflective layer. Recording of information due to a change in layer and information to be recorded will be described.

In the above, in order to record information by changing the light reflective layer, the reflective layer is partially removed by a thermal, chemical, or mechanical method, and the reflective layer is partially deformed. Partially changing the color of the reflective layer, partially changing the structure of the reflective layer, thermally changing the phase, partially changing the polarization characteristics of the reflective layer (magneto-optical method), and changing the partial mask. The reflective layer can be partially formed by performing metal deposition or the like through the intermediary process, or by partially replacing the material of the reflective layer. In order to record information by changing the light-reflective layer, any of the above-mentioned methods may be used, but it is preferable to employ a thermal method capable of performing recording with a small number of steps.

Examples of the thermal recording method include a method using a thermal head, a method using a laser beam, and a flash exposure with infrared rays using a mask or an infrared absorption pattern. Above all, laser light is excellent because it has high energy efficiency and scanning is possible.In particular, when pulsed laser light is used as laser light, high output can be obtained only in a very short time, This is preferable since it has no adverse effect on the layer. Particularly, in a recording method using a laser beam, as an example, halftone dots and lines can be formed at a pitch of 10 μm, and a very precise image can be formed. .

The information recorded by the change in the light-reflective layer as described in (1) to (4) is not recorded / reproduced with respect to the amplitude and phase of the light wave like a hologram, but is only the amplitude and / or wavelength of the light wave. Record /
It is something that is played.

The information recorded by the change of the light reflective layer includes the card number of the credit card,
Alternatively, there is an attribute number such as a name, a gift certificate, or a ticket number in a gift certificate. The information of these numbers is usually also recorded on the card base material, and is information unique to one card base material, so long as the information is associated with the information unique to each card base material. It is. In addition, "associated" does not necessarily indicate that the numbers are the same, but also includes the case where they are represented by different numbers and characters that look different by appropriate conversion, encryption, etc. It is only necessary to correspond to 1: 1.

Information recorded by the change in the light-reflective layer includes attribute data such as a photograph, fingerprint, or signature, or manufacturing data such as a manufacturing date, a manufacturing location, and a manufacturing lot number, in addition to the above. When these data are recorded on both the card base material and the hologram seal, the data becomes information associated with information unique to each card base material. Information is unique for each light diffraction structure (hologram in this case). Of course, the information recorded by the change in the light reflective layer may be a company name or a card name that does not necessarily require security, or other information. Regardless of the type of information, numerical and character information is recorded in a normal form and can be visually recognized.
It may be recorded in a form readable by humans and machines, such as CR characters or OMR characters.

As exemplified in FIG. 3, two types of information, that is, information associated with information unique to one card substrate and information unique to one optical diffraction structure, are used in the present invention. In, either one type of information may be recorded or both types of information may be recorded, but the former provides higher security.

In the present invention, the substrate 2 and the light diffraction structure (hologram in the above example) 6 are laminated on each other regardless of the form shown in FIG. 2A or FIG. 2B. Therefore, another information can be recorded between the base material 2 and the light diffraction structure 6 to further increase the difficulty of forgery and falsification.

Referring to FIG. 4A, an example in which different information is recorded between the substrate 2 and the light diffraction structure 6 will be described. FIG.
4 (a) and 4 (b) show a structure close to the shape to be implemented. FIG. 4 (a) shows the structure shown in FIG. 2 (a), and FIG. 2 (b).

In the card 1 shown in FIG. 4A, a hologram seal 6 is laminated on a card base material 2, and the cover seal 6 is composed of a release layer 61 and a release primer layer 6 from above.
2, having a structure in which a protective layer 63, a hologram layer (light diffraction structure layer) 64 having hologram irregularities on the lower surface, a light reflective layer 65, an image receiving layer 66, and an adhesive layer 67 are sequentially laminated. The light-reflective layer has a record 65a, and the image-receiving layer 66 has records 66a and 66b.

The card 1 shown in FIG. 4 (b) has a base material composed of a core sheet 2b and an oversheet 2a, and is the same as that in FIG. 4 (a). Hologram seal 6 having
Is laminated between the core sheet 2b and the oversheet 2a, but in practice, the base material is often composed of two core sheets and one oversheet above and below the core sheet. .

3A and 3B, the light reflecting layer 65 has a portion 65a in which the light reflecting layer 65 is changed, and information different from the hologram image of the hologram layer 64 is recorded. ing.

In FIGS. 3A and 3B,
In the image receiving layer 66, a dye image 66a formed by transferring a sublimable dye and a pigment image 66b formed by attaching a pigment or a pigment and a binder resin are formed.

The release layer 6 adheres the transfer sheet base material and the hologram seal 6 that are not shown in this figure with an appropriate adhesive force, and stably transfers the hologram seal 6 during transfer.
In this manner, there is a case where the film is transferred together with another layer onto the card substrate 2 which is the adherend by the transfer, and a case where the film remains attached to the transfer sheet substrate.

The release primer layer 62 is for ensuring the adhesive force between the release layer and the lower layer, and is auxiliary and may be omitted. The protective layer 63 is used to improve the durability of the hologram, for example, abrasion resistance, solvent resistance, or contamination resistance. When the durability is required to be high, a thermosetting resin or ionizing radiation curable resin is used. It is provided by coating or the like using a conductive resin, and is cured by heating or irradiation with ionizing radiation.

The hologram layer 64 is formed by forming hologram irregularities on a synthetic resin layer. As a hologram which is a typical example of the optical diffraction structure, both a plane hologram and a volume hologram can be used. Hologram), white light reproduction hologram (rainbow hologram, etc.), color hologram, computer hologram, hologram display, multiplex hologram, holographic stereogram, holographic diffraction grating and the like.

As the synthetic resin constituting the hologram layer 64, 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.

The formation of the hologram on the resin layer is performed as follows.
It can be formed by a conventionally known method using the above materials. For example, when recording an interference fringe of a diffraction grating or a hologram as a relief of surface irregularities, an original having the diffraction grating or the interference fringes recorded in the form of irregularities is used as a press mold, and the original is superimposed on the resin layer. By appropriate means such as a heating roll, by heat-pressing both,
The concave and 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.

As described above, the method of recording the interference fringes of the diffraction grating or the hologram on the surface of the light diffraction structure layer as the relief of the surface unevenness is particularly preferable since it has mass productivity and can reduce the cost. The thickness of such a hologram layer is 0.1
The range is preferably from 6 to 6 µm, more preferably from 0.1 to 4 µm.

When an interference fringe of a diffraction grating or a hologram is recorded as a relief of irregularities on the surface of the light diffraction structure layer 64 as described above, the light reflective layer 65 is placed on the relief surface in order to increase the diffraction efficiency. Preferably, it is formed.

If a thin metal film such as aluminum which reflects light is formed on the relief surface as the light reflecting layer 65, a reflection type light diffraction structure, typically, a hologram can be obtained.
If a transparent thin film is formed on the relief surface, a transparent light diffraction structure, typically, a hologram can be obtained. Whether to use the reflection type or the transparent type can be appropriately selected depending on the purpose. When a non-transparent metal thin film is used as the light-reflective layer 65, the light-reflective layer 65 needs to be directed to the side opposite to the observation side of the light diffraction structure layer,
In the case of the transparent light reflecting layer 65, the light reflecting layer 65
May be directed to either. In short, the laminated structure in which the light reflective layer 65 is laminated on the relief surface of the light diffraction structure layer 64 may be arranged in such a direction that the light diffraction structure (typically, a hologram) can be seen from the observation side. When printing is performed on the lower layer of the light diffraction structure layer 64, it is necessary to have transparency in order to secure the visibility thereof, and it is preferable to use a transparent thin film.

When the light reflecting layer 65 is formed of a metal thin film, Cr, Fe, Co, Ni, Cu, Ag, Au, G
e, Al, Mg, Sb, Pb, Cd, Bi, Sn, S
A metal such as e, In, Ga, or Rb, an oxide thereof, or a nitride thereof is formed alone or in combination. Of these, Al, Cr,
Ni, Ag, Au or the like is particularly preferable. When the light reflective layer is formed of a metal thin film, a thin film forming method such as a vacuum evaporation method, a sputtering method, and an ion plating method is used.

As a material of the light reflective layer 65, a continuous thin film of a substance having a different refractive index from that of the light diffraction structure layer 65 may be used. The thickness of the continuous thin film may be any as long as it is a transparent region of the material forming the thin film, but is usually preferably 100 to 1000 °. Examples of a method for forming a continuous thin film on the relief surface include a thin film forming method such as a vacuum deposition method, a sputtering method, and an ion plating method. The continuous thin film may have a refractive index larger or smaller than that of the light diffraction structure layer 64, but preferably has a refractive index difference of 0.3 or more, and a difference of 0.5 or more, and more preferably 1.0 or more. More preferably, there is.

As the continuous thin film having a higher refractive index than the light diffraction structure layer 64, ZnS, TiO ₂ , Al ₂ O ₃ , Sb ₂
Examples include S ₃ , SiO, TiO, and SiO ₂ . As a continuous thin film having a smaller refractive index than the light diffraction structure layer 64,
LiF, MgF ₂ , AlF _{3 and the} like can be mentioned. Also,
When the thickness is 200 ° or less, since the light transmittance is relatively small, it can be used as a light reflective layer while being transparent. Further, a transparent synthetic resin having a different refractive index from the light diffraction structure layer, for example, a layer of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl acetate, polyethylene, polypropylene, polymethyl methacrylate is added to the light reflective layer 65. It can also be used.

The image receiving layer 66 is made of a resin capable of receiving various color materials in the form of ink, ink ribbon, toner or the like to perform recording and holding the color material adhered or dyed by recording. Things. When such recording is not performed, the decorative material layer 66 may be omitted.

Specifically, the material constituting the image receiving layer 66 is a thermoplastic resin such as an acrylic resin, a polyamide resin, a polyvinyl acetate resin, a vinyl chloride / vinyl acetate copolymer resin, a polyester resin, or a cellulose resin. Preferably, it is composed of one or more of these resins. Alternatively, a thermosetting resin such as a polyurethane resin or an epoxy resin may be used, and may be used in combination with a thermoplastic resin.

The adhesive layer 67 is made of a vinyl chloride resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a polyester resin, a polyurethane resin, a polyamide resin, or the like. It is composed of a material appropriately selected from rubber modified products and the like. These may be used alone or in a mixed system of two or more kinds, and may be used by adding a hard resin, a plasticizer, and other additives as necessary. Although it is more convenient to provide the adhesive layer 67 on the transfer sheet, the adhesive layer 67 may be used by applying to the adherend and / or the transfer sheet at the time of transfer.

When each layer of the hologram seal 6 is formed of a synthetic resin on a transfer sheet substrate having mechanical strength such as a polyester resin film, the layers are sequentially formed by a known coating method or the like. Go. Recording of information on the light-reflective layer was performed at the time when the light-reflective layer was formed, or once the transfer sheet was formed up to the adhesive layer and completed, and then transferred to the substrate. This may be performed later or any of them.

The recording on the image receiving layer is preferably performed in a state where the image receiving layer is exposed, and therefore before the formation of the adhesive layer. However, the image receiving layer 66 may be provided on the base material 2 in advance, and after recording information, other layers of the hologram seal may be transferred. In any case, dye image 6
6a can be recorded using a sublimation transfer sheet formed by laminating a layer in which a sublimable dye is dissolved in a binder, a pigment image 66bh, and a melt transfer sheet formed by laminating a layer in which a pigment is dispersed in wax. The latter can be formed by electrophotography.

The material of the substrate 2 is polyvinyl chloride,
In addition to resins such as polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene, acrylic, polypropylene, polyethylene, etc., metals such as aluminum and copper, paper, and impregnated paper such as resin or latex alone Alternatively, a composite sheet or the like can be used. When heat resistance is required, a sheet of an amorphous polyester resin, a blend resin of an amorphous polyester resin and a polycarbonate resin, or the like can be used as a material of the base material 2.

The thickness of the substrate 2 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 mm.
It is. Then, the base sheet is made of polyvinyl chloride (hereinafter, referred to as polyvinyl chloride).
In the case of forming by PVC), usually, a white PVC sheet having a thickness of 280 μm is used as a core sheet, and two sheets are laminated, and transparent PVC sheets each having a thickness of 100 μm are overlaid on both sides as oversheets and laminated by hot pressing or the like. A base sheet having a total thickness of 0.76 mm is used.

In the above description, a card, especially a credit card has been described in mind, but various cards such as a bank card, an identification card, a membership card, a gift certificate, a gift certificate,
Alternatively, the present invention can be applied to a certificate, an examination ticket, a passport, a certificate of various qualifications issued by a public organization, and the like.

[0055]

According to the first aspect of the present invention, in addition to the image, information associated with information unique to each base material is recorded on the optical diffraction structure such as a hologram. Therefore, it is difficult to convert the light diffraction structure to another base material, and even if you try to make a new one, the light diffraction structure must correspond to the base material, so the difficulty of counterfeiting and alteration has increased An information recording medium can be provided. According to the second aspect of the present invention, in addition to the image, a unique information is added for each light diffraction structure to the light diffraction structure such as a hologram and recorded. It is difficult to convert to other base materials, and even if you try to create a new one,
Each time, unique information must be recorded in the light diffraction structure, so that it is possible to provide an information recording medium with increased difficulty of forgery and alteration. According to the third aspect of the present invention, it is possible to provide an information recording medium having both the effects of the first and second aspects of the present invention. According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3, since another information is recorded between the light diffraction structure and the base material, the manufacturing process is further complicated, An information recording medium with increased difficulty of forgery and alteration can be provided. According to the fifth aspect of the present invention, it is possible to provide an information recording card having the effects of any one of the first to fourth aspects of the present invention and having the convenience of the card.

[Brief description of the drawings]

FIG. 1 is a plan view of a card according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a card according to an embodiment of the present invention.

FIG. 3 is a plan view of a hologram seal according to the present invention.

FIG. 4 is a partial cross-sectional view of the card of the preferred embodiment.

[Explanation of symbols]

Reference Signs List 1 card 2 base material 4 embossed character 6 hologram seal 7 hologram 8 image 9 unique information for each base material 10 unique information for each light diffraction structure 65 light reflective layer (65a; recording by change of light reflective layer) 66 Image receiving layer (66a; dye image, 66b; pigment image)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C005 HA02 HA10 HB01 HB02 HB09 HB10 JA01 JA08 JA11 JA15 JA26 JB08 JB09 KA01 KA08 KA15 KA31 KA37 KA45 KA48 LA03 LA11 LA20 LA22 LA29 LA30 LB03 LB07 LB08 A43AA AA AA70 2K008 AA13 BB08 EE04

Claims (5)

[Claims] 1. A light diffractive structure comprising at least a light reflective layer and a light diffractive structure layer is embedded and laminated in a base material so as to be observable from above the base material, or is formed on the base material. Laminated, unique information is recorded for each substrate on the substrate, the light reflective layer,
An information recording medium, wherein information associated with information unique to each base material is recorded by a change in a light reflective layer. 2. A light diffractive structure comprising at least a light reflective layer and a light diffractive structure layer is embedded and laminated in a base material so as to be observable from above the base material, or is formed on the base material. An information recording body which is laminated, wherein information unique to each light diffraction structure is recorded on the light reflective layer by a change in the light reflective layer. 3. A light diffractive structure comprising at least a light reflective layer and a light diffractive structure layer is embedded and laminated in a base material so as to be observable from above the base material, or is formed on the base material. Laminated, the base has recorded thereon unique information for each base, and the light reflective layer has information associated with the unique information for each base, and one light An information recording medium wherein information unique to each diffraction structure is recorded by a change in a light reflective layer. 4. Between the substrate and the light diffraction structure,
The information recording body according to any one of claims 1 to 3, wherein further information is recorded. 5. The information recording card according to claim 1, wherein the base material has a portable card size.