JP2002140682A - Information recording medium and method for manufacturing information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more improve the safety of a seal of light diffraction structure by expressing the execution of forgery/modification by adding data to a hologram seal of a type for recording data in a reflection layer by a laser or the like by a similar means as an appearance change of the hologram seal. SOLUTION: A hologram layer 9 and a metallic reflection layer 8 are successively laminated on the lower surface of a transparent plastics film 10 as a hologram seal 6, and after forming a record consisting of a set of fine hole parts 8a on the reflection layer 8 by the laser or the like, the hologram seal 6 is laminated on a substrate 2 through a heat sensitive coloring layer 7 to form an information recording body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a recording method in which a metal reflection layer constituting an optical diffraction structure such as an optical diffraction structure is composed of a set of fine apertures formed by thermal recording such as laser recording. Also, the present invention relates to an information recording medium comprising a set of such fine holes, in which it is difficult to rewrite a recording, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Some information recording media recording various types of information, such as cash vouchers and securities, have a high monetary value, and the information recording media themselves have a high monetary value. Even if you do not have one, there is a kind of credit card that can be economically expensive if used improperly. In any case, there is no end to unjust persons such as "counterfeiting" which falsifies counterfeiting as genuine and "authorization" which acquires the genuine article and changes it illegally.

One of the measures against counterfeiting and alteration is
A hologram seal is attached as a certificate stamp. Optical diffraction structures represented by holograms are often used, for example, in the form of small seals, because of their precise patterns and the need for advanced technology in their manufacture. In addition,
In general, hologram seals include those in which an original hologram having a three-dimensional image is formed and those in which a diffraction grating having no three-dimensional image is contoured in an appropriate pattern, and the like. Are called hologram seals because they are similar. In the following description, a hologram is also used as a term indicating a diffraction grating, and a hologram seal is also used as a term indicating a seal having a diffraction grating.

At present, to manufacture a hologram seal,
The hologram layer is formed by irradiating a curable resin such as a photosensitive resin with interference light of a laser beam to cause fine irregularities or a change in the refractive index of light inside, or by using an irregular mold to copy the hologram layer. After obtaining, by laminating a metallic gloss layer such as an aluminum thin film on the uneven surface, or a transparent layer having a different refractive index of light from the resin of the hologram layer as a reflective layer,
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.

In practice, in order to easily apply the hologram to various adherends, a protective layer formed of an ionizing radiation-curable resin, such as a releasable resin layer on a support sheet, is required. A primer layer, a hologram layer, a metal reflection layer, and a transfer sheet in which an adhesive layer and the like are sequentially laminated and used, and a transfer layer is formed on a substrate such as a card by transfer, a protective layer from above, a primer layer as necessary, In many cases, a hologram layer, a metal reflection layer, and an adhesive layer are sequentially laminated (JP-A-10-187046).

[0006] The hologram pattern of the hologram seal described above is itself very fine, and it is difficult to imitate the same thing. Therefore, it is said that the hologram seal attached is difficult to forge. For these reasons, hologram seals are widely used,
It is often used for credit cards.

[0007] However, hologram seals are commonly used for similar credit cards of the same company in many cases, and such credit cards are widely available. If it is proof that the hologram sticker is genuine, obtain a credit card, peel off the hologram sticker,
The idea arises of sticking to an illegally created card substrate.

In connection with this, Japanese Patent Publication No. 6-85102 and Japanese Patent Publication No. 6-90590 disclose processing the second information in addition to the first information possessed by the optical diffraction structure by processing the reflection layer. Although it is described that it is to be provided, the difficulty of forgery of the light diffraction structure is increasing, but 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 those of the light diffraction structure,
And machine-readable barcodes, OCR characters, O
It is described that MR and the like are preferably formed by using a pulse laser.

In the above technique, although information other than the light diffraction structure is added to the light diffraction structure to make the manufacturing process more complicated, the added information itself is not special. , May be analyzed and imitated, especially due to counterfeiting or falsification when reworking the reflective layer of the light diffraction structure separated from genuine cards etc. It is difficult to determine that there is.

[0010]

SUMMARY OF THE INVENTION In the present invention, when a hologram seal of a type that records on a reflective layer is forged or altered by additional recording by the same means, forgery or alteration is performed. An object of the present invention is to further improve the safety of the hologram seal so as to appear as a change in the appearance of the hologram seal.

[0011]

According to our study, after recording on the reflective layer of the hologram, a thermosensitive coloring layer is formed under the holographic layer, so that additional recording can be performed with unintended intention. In the case of counterfeiting or alteration, the thermosensitive coloring layer immediately below the opening formed by the additional recording develops a color, and an information recording body having an appearance that cannot be generated by regular recording is obtained. Has been found to be able to be solved, and the present invention has been achieved.

According to a first aspect of the present invention, there is provided a light diffraction structure comprising a laminated structure in which at least a metal reflection layer and a light diffraction structure layer are laminated from the lower surface side. Embedded or laminated in the adherend substrate so as to be observable from above the material, or laminated on the adherend substrate, and further, the metal reflective layer has a fine aperture Recording is formed, and a thermosensitive coloring layer is laminated on the substrate under the light diffraction structure or on the adherend substrate at a position corresponding to the lower part of the light diffraction structure. And an information recording medium. According to a second aspect of the present invention, at least an optical diffraction structure layer and a metal reflection layer are sequentially laminated on one surface of a film-like base material, and then a fine opening is formed on the metal reflection layer using a laser beam. Form a record consisting of a set of holes, and after forming the record,
After laminating a thermosensitive coloring layer on the metal reflective layer to obtain a recorded composite laminated film, the recorded laminated composite film and the adherend substrate are adhered on the thermosensitive coloring layer side. The present invention relates to a method for producing an information recording body, which is laminated so as to face a body base material. According to a third aspect of the present invention, at least an optical diffraction structure layer and a metal reflection layer are sequentially laminated on one surface of a film-like base material, and then a fine opening is formed on the metal reflection layer using a laser beam. After forming a recording formed of a set of holes to obtain a laminated film on which recording has been performed, and laminating a thermosensitive coloring layer on an adherend substrate, the recording-formed laminated film is coated with the laminated film. The present invention relates to a method for manufacturing an information recording body, comprising laminating a wearing base material such that the metal reflective layer and the thermosensitive coloring layer face each other. In a fourth aspect based on the second or third aspect, one surface of the film-shaped substrate is a release surface, and the recording-formed composite laminated film or the recording-formed laminated film is attached to the adherend. The present invention relates to a method for producing an information recording body, wherein the film-like substrate is peeled off when laminating the substrate with a substrate. According to a fifth aspect of the present invention, in any one of the second to fourth aspects, prior to laminating the light diffraction structure layer on the film-like substrate, laminating a release layer or a protective layer,
Alternatively, the present invention relates to a method for manufacturing an information recording body, comprising sequentially laminating the release layer and the protective layer. According to a sixth aspect, in any one of the second to fifth aspects, after laminating the metal reflective layer, a heat-sensitive adhesive layer is laminated on the metal reflective layer, or an anchor layer and the heat-sensitive adhesive layer are formed. Laminated in order, when laminating the thermosensitive coloring layer, the thermosensitive adhesive layer is laminated on the thermosensitive coloring layer, or the anchor layer and the thermosensitive adhesive layer are sequentially laminated. And a method for manufacturing an information recording medium. According to a seventh aspect of the present invention, at least one of a light diffractive structure layer and a metal reflective layer is sequentially laminated on one surface of the film-like base material, and a heat-sensitive coloring layer is laminated in different places. And, using a laser beam, and after forming a record consisting of a collection of fine apertures in the metal reflective layer, after performing the film-shaped substrate with the side on which each layer is laminated the inside the film-like substrate By folding, laminating the metal reflective layer and the thermosensitive coloring layer,
Thereafter, by peeling and removing the portion of the film-shaped base material that is laminated with the thermosensitive coloring layer, a recording comprising the set of the film-shaped base material, the light diffraction structure layer, and the fine apertures is formed. 3. After obtaining a recorded composite laminated film on which the formed metal reflection layer and the thermosensitive coloring layer are laminated, the recorded composite laminated film and the adherend substrate are laminated. The present invention relates to a method for producing the described information recording medium. An eighth invention is the information according to the seventh invention, wherein at least one side of one surface of the film-shaped substrate is a release surface, and at least a thermosensitive coloring layer is laminated on the release surface. The present invention relates to a method for manufacturing a recording medium. A ninth invention is directed to the eighth invention, wherein the entire surface of one surface of the film-shaped substrate is a release surface, and when the recorded composite laminated film and the adherend substrate are laminated, The present invention relates to a method for producing an information recording medium, wherein the film-like substrate is peeled off. Tenth
In the invention according to any one of the seventh to ninth inventions, prior to laminating the light diffraction structure layer on the film-like substrate, a release layer or a protective layer is laminated, or the release layer and the The present invention relates to a method for manufacturing an information recording body, comprising sequentially laminating protective layers. In an eleventh aspect based on the seventh to eleventh aspects, prior to laminating the thermosensitive coloring layer, a thermosensitive adhesive layer is laminated on the film-like substrate, or the thermosensitive adhesive layer and The present invention relates to a method for manufacturing an information recording body, which comprises sequentially stacking anchor layers.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An information recording medium according to the present invention will be described with reference to an information recording card applied to a card such as a bank card or a credit card. However, the present invention is not limited to credit cards. In this specification, a card refers to an industrially and commercially negotiated card having a portable size of about 54 mm × 86 mm and having some kind of proof function such as identification (= ID). Shall be.

As shown in FIG. 1, the information recording card 1
This is the appearance of a credit card. The printing 3 is applied on the base material 2 of the information recording card 1. For example, in addition to characters such as the name of the card and the item of the expiration date, the printing 3 of an appropriate design such as a design determined for each type of the card. An embossed character 4 is also provided on the base material 2. The embossed character 4 is formed by embossing, and is information unique to each card, that is, a card number, an expiration date of the card, and a name of a card holder, which are information unique to each base material. Is shown. On the base material 2, a magnetic recording layer 5 is formed. The magnetic recording layer 5 may be further covered with a concealing layer to make it invisible. A hologram seal 6 is attached to a part of the base material 2 to ensure that the card is genuine and to prevent forgery. On the hologram seal 6, for example, as shown in FIG. 1, a pattern (shown by a star outline design) 5a, a face photograph 6b of the card holder, and the like are formed.

A print 3, an embossed character 4, a magnetic recording layer 5 and the like formed on a base material 2 are usually provided in the case of a card. You don't have to have all of these, but when you consider the features of the current card,
At a minimum, a magnetic recording layer 5 should be provided. Of course,
An IC module and / or an optical recording layer (both not shown) may be provided instead of the magnetic recording layer 5,
It may have two or three of the magnetic recording layer, the IC module, and the optical recording layer.

[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. It should be provided with an embossed character 4 which may be actually used for a credit card application.

FIG. 2 shows a cross section of the information recording card 1 cut along the line AA in the left-right direction across the portion where the hologram seal 6 is attached. The hologram seal 6 may be stacked on the base material 2 as shown in FIG. 2A.
This mode is suitable when the light diffraction structure seal 6 is applied by a transfer method or the like. As shown in FIG. 2B, the light diffractive structure seal 6 is made of a laminate in which a transparent sheet 2a whose uppermost layer is called an oversheet and a normal white sheet 2b called a core sheet are stacked thereunder. May be interposed and laminated between base materials. In many cases, the actual card base material 2 is formed by laminating oversheets on and under two core sheets. Therefore, in the case of this form, the hologram seal 6 is pasted on either the core sheet 2b or the over sheet 2a in the process of completing the card base, or
It is suitable when the hologram seal 6 is applied depending on whether the optical diffraction structure seal 6 is interposed when the core sheet 2b and the oversheet 2a are attached.

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

The specific structure of the hologram seal 6 is shown in FIG.
It is explained while citing. In the present invention, as shown in FIG. 3A, the hologram seal 6 includes at least a hologram layer 9 made of a transparent resin layer having a hologram.
And a hologram structure having a laminated structure in which a metal reflective layer 8 is laminated thereunder. Usually, a hologram is formed as fine irregularities on the lower surface side of the hologram layer 9, and the metal reflection layer 8 is laminated on the irregular lower surface along the irregularities. Then, in the metal reflection layer 8, a record composed of a collection of fine openings 8a is formed. Here, the opening 8a indicates a hole having a hole penetrating the metal reflective layer 8. Further, in the present invention, the thermosensitive coloring layer 7 is laminated so as to cover the lower part of the metal reflection layer 8 of the hologram seal 6, at least the lower part of the opening 8a of the metal reflection layer 8, and the hologram seal 6 It has a basic structure in which the hologram layer 9, the metal reflection layer 8, and the thermosensitive coloring layer 7 are sequentially laminated.

Actually, in the basic structure of the hologram seal described above, it is difficult to smoothly manufacture and handle the hologram seal. Therefore, the hologram seal 6 is further laminated with a film-like base material 10 as the uppermost layer. Often the structure is

The hologram seal 6 including the film-shaped substrate 10 can be laminated as it is with the thermosensitive coloring layer 7 side facing the adherend, or when the film-shaped substrate is peeled off during lamination. is there. In the former case, the hologram seal 6 is also called a hologram label, and in the latter case, the hologram seal 6 is called a hologram transfer sheet. Therefore, in this specification, the hologram seal 6
Is used to include both hologram labels and hologram transfer sheets. Various types of hologram seals described with reference to FIGS. 3 to 5 can be any of a hologram label and a hologram transfer sheet.

Various layers can be further added to the hologram seal as described below with reference to FIG. 3B. In FIG. 3B, various layers that are frequently used are comprehensively added, but not all layers are always added. In order to enhance the adhesiveness between the layers, a treatment such as a corona discharge treatment, an oxidation treatment, or an anchor layer coating can be arbitrarily performed. Also,
When laminating separately prepared ones, an adhesive may be used as appropriate.

The release layer 14 is added when the hologram seal 6 is used as a hologram transfer sheet.
This is a layer for causing a smooth separation between the film-shaped base material 10 serving as the base material of the transfer sheet and each layer to be transferred (collectively referred to as a transfer layer). With necessary strength, it also plays a role of an adhesive for laminating the film-shaped substrate 10 and the transfer layer. Although the term release layer is used in various senses, in this specification, the release layer 14 is to be released together with the transfer layer during transfer. Note that a release layer that is laminated on the film-shaped substrate 10 side and peeled off while being adhered to the film-shaped substrate 10 during transfer may be formed.

The protective layer 13 is composed of the release layer and the release layer 14 described above.
Regardless of whether it is present or not, it occupies a part of the uppermost layer of the transfer layer together with the release layer, thereby improving the physical or chemical durability of the surface of the transfer layer after transfer. In the case of a hologram label, since the film-shaped substrate 10 is the uppermost surface and can also serve as a protective layer, it is not necessary to provide a separate protective layer. If provided, it may be provided on the upper surface of the film-shaped substrate 10.

The heat-sensitive adhesive layer 12 is formed on the hologram seal 6.
Is an adhesive layer for laminating on the adherend. When the adhesive layer is made of a heat-sensitive adhesive, it is easy to use and is often used because it does not have tackiness when not in use.However, it is also possible to use an adhesive other than the heat-sensitive adhesive to form the adhesive layer. it can. The hologram seal 6 having the basic structure shown in FIG. 3A has an adhesive applied to the thermosensitive coloring layer 7 side of the hologram seal 6 and / or on the adherend at the time of lamination on the adherend. Thus, it can be used as a hologram label or a hologram transfer sheet. However, it is easier to use the structure of the hologram seal 6 with an adhesive layer as described above.

The anchor layer 11 is a layer for improving the adhesiveness between the hologram seal and the thermosensitive coloring layer 12. In the present specification, in a portion where the adhesive layer or the heat-sensitive adhesive layer is laminated, they may be laminated via an anchor layer.

The hologram seal 6 having the above structure
At least, in a state where the thermosensitive coloring layer 7 is not laminated, a recording composed of a collection of fine openings 8a is formed in the metal reflection layer 8 by a thermal recording method. Examples of the thermal recording method include a method using a thermal head, a method using a laser beam, and an infrared flash exposure using a mask or an infrared absorption pattern. Among them, 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 for a very short time, so that it can be used for other layers. It is preferable because it does not have an adverse effect. In the recording method using laser light, for example, 10 μm
Since halftone dots and lines can be formed and a very precise image can be formed, a shaded pattern such as the face photograph 6b shown in FIG. There are advantages that can be done.

As described above, information recorded by recording composed of a collection of fine openings 8a formed in the metal reflection layer is recorded / reproduced with respect to the amplitude and phase of a light wave like an optical diffraction structure. Instead, they are recorded / reproduced only with respect to the amplitude and / or wavelength of the light wave.

The information recorded by the collection of the fine openings 8a formed in the metal reflection layer 8 may be of any content and recording format. For example, the information may be a credit card number or a diffusion holder. It is preferable to use an attribute number such as a name of a gift certificate, 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 2 and is information unique to each card base material 2. Information. 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. 1: 1
It should just correspond to.

The information recorded by the collection of the fine apertures of the metal reflection layer 8 may be attribute data such as a face photograph, a fingerprint or a signature,
There is manufacturing data such as manufacturing location and manufacturing lot number.If these data are recorded on both the card base and the optical diffraction structure seal, the information associated with the information unique to each card base and However, when the information is recorded only on the hologram seal 6, the information is unique to one hologram seal. Of course, the information recorded on the metal reflective layer 8 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 visible,
The information may be recorded in a machine-readable form such as a bar code, an OCR character, or an OMR character in a form that can be read by both humans and machines.

In the present invention, one of the above two types of information, that is, information associated with information unique to one card substrate and information unique to one hologram, is used in the present invention. May be recorded alone, or both types of information may be recorded, but at least recording the former type of information is higher than not recording the former type of information. Give security.

In the hologram seal 6 of the present invention,
By the thermal recording method, fine apertures 8 are formed in the metal reflection layer 8.
Since a record consisting of the set of a is formed, it is necessary to laminate the thermosensitive coloring layer 7 after the recording.

Then, as shown in FIG. 4, a hologram layer 9 and a metal reflection layer 8 are sequentially laminated on the lower surface of the film-like base material 10 to produce a hologram seal 6. At this stage, any one of the release layer, the release layer 14 and the protective layer 13 described with reference to FIG. 3B, or two or more layers may be laminated.

Next, the light diffraction structure seal 6 in this state is irradiated with a laser beam or the like to form a recording formed of a set of fine openings 8a in the metal reflection layer 8 by using a thermal recording method. I do. After forming the record, the thermosensitive coloring layer 7,
The thermosensitive coloring layer 7 may be laminated on the lower surface of the metal reflective layer 8 or may be laminated on the adherend.

FIG. 4C shows a case in which the thermosensitive coloring layer 7 is laminated on the lower surface of the metal reflection layer 8 and then laminated on the adherend. Substrate 2 is assumed. First, the thermosensitive coloring layer 7 is laminated so as to cover the lower surface of the metal reflection layer 8, at least the lower surface of the opening 8 a of the metal reflection layer 8. Since the lamination of the thermosensitive coloring layer 7 can be performed by coating or transfer, the lamination of the thermosensitive coloring layer 7 may be accompanied by an adhesive layer. Since the laminated body on which the thermosensitive coloring layer 7 is laminated is then attached and laminated on the adherend, the thermosensitive adhesive layer 12 described with reference to FIG. 3B may be laminated. Alternatively, the heat-sensitive adhesive layer 12 may be laminated via the anchor layer 11. The laminate in which the heat-sensitive coloring layer 7 and the heat-sensitive adhesive layer 12 are stacked is superimposed on the base material 2 as an adherend such that the heat-sensitive adhesive layer 12 side is in contact with the laminate, and is heated. Preferably, the layers are bonded to each other by heating while applying pressure so that they are bonded to each other. The heat-sensitive adhesive layer 12
Is not laminated on the lower surface of the thermosensitive coloring layer 7 as described above,
It may be laminated on the base material 2 or may be laminated on both. As described above, when the thermosensitive coloring layer 7 is laminated on the lower surface of the metal reflection layer 8, even before the lamination on the base material 2, the thermochromic layer 7 already has the effect of preventing tampering. As described, it is more preferable than the case where the thermosensitive coloring layer 7 is laminated on the adherend.

FIG. 4 (c ') shows that the thermosensitive coloring layer 7 is laminated on the substrate 2 which is the adherend, and the metal reflecting layer 8 is formed on the thermosensitive coloring layer 7 in a fine pattern. A case is shown in which a hologram seal on which a record including a set of apertures 8a is formed is stacked. Therefore, first, the thermosensitive coloring layer 7 is laminated on the card base material 2. Since the lamination of the thermosensitive coloring layer 7 can be performed by coating or transfer, the lamination of the thermosensitive coloring layer 7 may be accompanied by an adhesive layer. In addition, a hologram seal in which a film-shaped base material 10, a hologram layer 9, and a metal reflection layer 8 are sequentially laminated, and a recording formed of a collection of fine openings 8a is formed in the metal reflection layer 8, The heat-sensitive adhesive layer 12 may be laminated, or the heat-sensitive adhesive layer 1 may be interposed via the anchor layer 11.
2 may be laminated. This heat-sensitive adhesive layer 12
It may be laminated on the thermosensitive coloring layer 7 laminated on the base material 2, that is, it can be provided on one or both of those to be adhered.

Thereafter, a film-shaped base material 10, a hologram layer 9, and a metal reflection layer 8 are sequentially laminated, and a hologram seal in which a recording made up of a collection of fine openings 8a is formed in the metal reflection layer 8; The base material 2 on which the thermosensitive coloring layer 7 is laminated is connected to the metal reflection layer 8 side of the hologram seal and the base material 2
The layers are superposed on each other so as to face the heat-sensitive coloring layer 7 and heated, preferably by heating while applying pressure, thereby bonding and laminating each other. In addition,
4 (c) and (c '), when the film-like base material 10 is peeled off at the time of lamination, it is a transfer, and when it is used without being peeled off, it is a label.

In the above method, recording cannot be performed on the metal reflective layer 8 in the state where the thermosensitive coloring layer 7 is present. Therefore, after recording, the thermosensitive coloring layer 7 is laminated or adhered. It is necessary to laminate the thermosensitive coloring layer 7 on the body side. However, if possible, among the layers involved, other than the substrate 2 of the adherend, the film-like substrate 1
It is convenient to complete the lamination on the zero.

Referring to FIG. 5, the film-shaped substrate 10
A laminate is prepared in which each layer other than the base material 2 is laminated in advance, and recording on the metal reflective layer 8 can be performed without affecting the thermosensitive coloring layer 7. A method for manufacturing an information recording medium using the method will be described.

First, a hologram layer 9 and a metal reflection layer 8 are sequentially laminated on one side of the film-like substrate 10 in FIG. Hologram layer 9
Preferably, fine irregularities of the hologram are formed on the upper surface side, and the metal reflection layer 8 is laminated along the irregularities. In FIG. 5A, the thermosensitive coloring layer 7 is laminated on the other side of the film-shaped substrate 10 toward the right side from the center. Therefore, the hologram layer 9 and the metal reflection layer 8 and the thermosensitive coloring layer 7 are laminated on the film-like base material 10 at different locations, and a hologram seal intermediate which is a recording object to be subjected to the next recording 15 are formed.

By using a thermal recording method such as irradiating the metal reflection layer 8 of the hologram seal intermediate 15 thus prepared with a laser beam, the metal reflection layer 8 has fine holes 8a. Is formed from a set of
(B)). Subsequently, the film-shaped substrate 10 is formed around a substantially middle portion (shown by a vertical broken line) in which the hologram layer 9 and the metal reflection layer 8 and the thermosensitive coloring layer 7 are separately laminated. 10, the upper surface of the thermosensitive coloring layer 7 and the upper surface of the metal reflective layer 8 having the opening 8a are overlapped and bonded together. If necessary, by heating
Preferably, the layers are bonded to each other by heating while applying pressure so that they are bonded to each other.

After the lamination, the portion where the film-shaped substrate 10 and the thermosensitive coloring layer 7 are laminated is peeled off. After peeling, the portion of the film-form base material 10 where the film-form base material 10 and the thermosensitive coloring layer 7 are laminated is unnecessary, so that it is cut or slit as necessary and removed. Good.

As described above, a hologram seal in which a hologram layer 9, a metal reflection layer 8 on which a recording made of a set of apertures 8 a is recorded, and a thermosensitive coloring layer 7 are sequentially laminated on a film-like substrate 10. 15 'is obtained, just as in FIG.
One corresponding to the upper laminate in (c) is obtained. Thereafter, in the same manner as described with reference to FIG. 4 (c), the information recording medium is obtained by laminating with the base material 2 of the adherend. At the time of sticking, there are a case of transfer in which the film-like base material 10 is peeled and a case of a label which is not peeled.

Various layers described with reference to FIG. 3B can be added to the light diffraction structure seal intermediate 15 described with reference to FIG. Here, the film-like substrate 1
One or more of the release layer, the release layer 14 and the protective layer 13 may be arbitrarily selected and laminated between the zero and the light diffraction structure layer 9 as described above. Film substrate 10
Since it is necessary to transfer the thermosensitive coloring layer 7 to the metal reflecting layer 8 side between the thermosensitive coloring layer 7 and the thermosensitive coloring layer 7, the release layer and the release layer 1
4. One or more layers may be arbitrarily selected from the respective layers of the protective layer 13 and laminated.

As described with reference to FIGS. 5B and 5C, since the metal reflective layer 8 and the thermosensitive coloring layer 7 need to be laminated, the adhesive layer, preferably the thermosensitive adhesive layer, It is good to laminate on one or both of the metal reflective layer 8 and the thermosensitive coloring layer 7, but from the viewpoint of recording, it is more preferable that the metal reflective layer 8 has no heat-sensitive adhesive layer. preferable.

It is more convenient to laminate a heat-sensitive adhesive layer on the uppermost layer of the hologram seal 15 'as shown in FIG. 5 (c), and this heat-sensitive adhesive layer is a heat-sensitive coloring layer. However, in the initial state shown in FIG. 5A, an adhesive layer, preferably between the film-like base material 10 on the lower surface of the thermosensitive coloring layer 7 on the right side, is preferably used. Preferably, a heat-sensitive adhesive layer is laminated. Therefore, in some cases, the thermosensitive coloring layer 7 on the right side in FIG.
May have a laminated structure of an adhesive layer, a thermosensitive coloring layer 7, and an adhesive layer from the film-like substrate 10 side. Preferably, each of the adhesive layers is a heat-sensitive adhesive layer. Hereinafter, the materials constituting each of the above-mentioned layers, the forming method, and the like will be described.

As the film-like base material 10, when manufacturing a hologram seal, heat resistance and solvent resistance required for sequentially laminating each layer, and also forming the optical diffraction structure seal as a card base material When using a thermal transfer method by sticking or transferring on an adherend such as, it is necessary to have heat resistance, and a plastic film having these properties, for example, a biaxially stretched polyethylene terephthalate film (hereinafter simply referred to as , PET film). It is preferable that the film-shaped base material 10 is transparent in manufacturing the hologram seal and in confirming the manufactured hologram seal. When using a PET film, the thickness is preferably from 5 to 250 μm, and considering the workability, tensile strength, thermal efficiency at the time of thermal transfer, etc.
Those having a thickness of 50 μm are more preferred. If necessary, the film-shaped substrate 10 is adhered to the film-shaped substrate 10, and
A release layer on which a layer to be laminated is easily peeled off may be formed so as to be releasable. The release layer is formed, for example, by adding wax, silicone resin, or the like to a resin having adhesiveness to the film-shaped substrate 10 such as a polyester resin.

The release layer 14 is used to stabilize the adhesion between the film substrate 10 and the transfer layer so as to be appropriate, and to release the transfer layer smoothly during transfer. Here, as described above, it is assumed that the material is transferred onto the adherend together with the transfer layer by transfer. In some cases,
In order to secure the adhesive force between the release layer and the lower layer, a release primer layer may be interposed. The release layer 14 is formed of an acrylic skeleton resin such as an acrylic resin, a vinyl chloride / vinyl acetate copolymer, a mixture of cellulose acetate and a thermosetting acrylic resin, a melamine resin, or a resin selected from a nitrocellulose resin and the like. Accordingly, it is composed of a resin composition in which polyethylene wax, wax, silicone resin or the like is blended as an additive. Preparation of peel force,
In particular, a polyester resin can be added to the above resin to increase the peeling force. These resins and additives may be dissolved or dispersed with an appropriate solvent and applied as a release layer forming ink composition or coating composition by a known printing means or coating means, followed by drying and solidifying. Thus, the release layer 14 can be formed.

The protective layer 13 is used to improve the durability of the hologram, for example, abrasion resistance, solvent resistance, stain resistance, etc. When the demand for durability is high, a thermosetting resin or the like is used. It is provided by coating using an ionizing radiation curable resin and cured by heating or irradiation with ionizing radiation. Specific examples of ionizing radiation-curable resins include:
Polyurethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, and the like, which may be used by adding a polyfunctional or monofunctional monomer to adjust the viscosity or crosslink density to each prepolymer, Further, if necessary, a known photoreaction initiator and sensitizer may be added for use. In addition, a polyene / thiol-based ionizing radiation curable resin and the like are also excellent in abrasion resistance and can be preferably used.

The hologram layer 9 is a layer in which a light diffraction structure is formed on a synthetic resin layer. As the hologram, both a plane hologram and a volume hologram can be used, and specific examples are a relief hologram, a Lippmann hologram,
Fresnel hologram, Fraunhofer hologram, lensless Fourier transform hologram, laser reproduction hologram (image hologram, etc.), white light reproduction hologram (rainbow hologram, etc.), color hologram,
Examples include computer holograms, hologram displays, multiplex holograms, holographic stereograms, holographic diffraction gratings, and the like.
In addition to the method using the holographic recording method, the diffraction grating may be directly formed by mechanical cutting or by using an electron beam or a laser beam.

The synthetic resin constituting the hologram layer 9 includes polyvinyl chloride, acrylic resin (eg, PMMA),
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,
Thermosetting resins such as melamine (meth) acrylate and triazine acrylate can be used alone or in combination with the thermoplastic resin and the thermosetting resin. Further, radical polymerizable unsaturated groups can be used. It is possible to use a thermoformable substance having the composition or a substance obtained by adding a radical polymerizable unsaturated monomer to the composition to make the composition curable with ionizing radiation. In addition, silver salts, gelatin dichromate, thermoplastics, diazo photosensitive materials, photoresists,
Photosensitive materials such as ferroelectrics, photochromic materials, thermochromic materials, and chalcogen glass can also 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. When recording the interference fringes of the hologram as a relief of surface irregularities, using an original plate in which the interference fringes are recorded in the form of irregularities as a press mold, superimposing the original plate on the resin layer, and appropriately using a heating roll or the like. By heat-pressing the both, the concave and convex pattern of the original plate 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 relief of the surface unevenness is
The method of recording interference fringes on the surface of the hologram layer is particularly preferable because it has mass productivity and can reduce the cost. The thickness of such a hologram layer is preferably in the range of 0.1 to 6 μm, more preferably in the range of 1 to 4 μm.

When interference fringes are recorded as reliefs on the hologram layer 9 as described above, it is preferable to form the metal reflection layer 8 on the relief surface in order to increase the diffraction efficiency. As the metal reflection layer 8, a thin metal film such as aluminum which reflects light is formed on the relief surface. As the metal thin film, in addition to aluminum, Cr, film-like base material e, Co, Ni, Pd, Cu, Ag, Au,
Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, T
I, a film-like substrate e, a metal such as Te, Zn, In, Ga, or Rb, an oxide, a nitride, or an alloy composed of a combination of these metals. Of these, Al, Cr, Ni, Ag, or A
u and the like are particularly preferred.

The formation of the metal reflection layer 8 composed of a metal thin film
It is performed by a thin film forming method such as a vacuum evaporation method, a sputtering method, and an ion plating method. The thickness of the metal reflective layer 8 may be set under appropriate conditions depending on the color tone, design, application, etc., but is preferably in the range of 50 to 1 μm, and more preferably 100 to 1000 °. When it is desired to provide a colored light reflecting layer having transparency,
Å It is preferable to set the following. 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 used for the transfer foil,
In consideration of the total design, it can be set as required, such as color tone, concealing property, or transparency.

The heat-sensitive coloring layer 7 is described in JP-A-5-57463.
And a known color former, a developer and, if necessary, a sensitizer used in a thermosensitive recording medium as described in JP-A-5-38031. .

Among these, any color-forming substance used as an electron acceptor in a thermosensitive recording medium can be used as the color-forming agent. For example, colorless leuco dyes such as triphenylmethphthalide type, phenothiazine type, spiropyran type, rhodamine lactam type, leucomilan type, and fluoran type are exemplified, and among them, fluoran type dyes are preferable.

As the color developer, any acidic substance used as an electron acceptor in a thermosensitive recording medium can be used. For example, acidic clay kaolin, inorganic developers such as zeolite, or aromatic carboxylic acids, anhydrides or metal salts thereof, organic sulfonic acids, or other organic acids, phenolic compounds, methylolated phenolic compounds And organic color developers such as salts and complexes of phenol compounds. Among them, a methylol compound of a phenol compound or a salt (including a complex salt) of a phenol compound is more preferable.

As the sensitizer, any sensitizer used in the composition for laser marking can be used, and among them, borates, phosphates and silicates are preferable. The particle size of the sensitizer is usually 10 μm or less,
Above all, those having a thickness of 1 to 4 μm are preferable. These sensitizers may be surface-treated with a titanium coupling agent, a silane coupling agent, a metallic soap, a surfactant, a resin, or the like in order to enhance dispersibility.

The above-mentioned color former, color developer, and sensitizer to be added as required, preferably have a developer / color former ratio of 0.1 / 1 to 5/1, more preferably 0.5 / 1 ~
3/1. The sensitizer is a color former, a developer, and a sensitizer to be added as necessary, and the total amount of non-volatile components in an ink composition or a coating composition comprising a binder resin, a solvent, or a diluent. Content rate,
It is 3 to 60% (mass ratio, the same applies hereinafter), more preferably 5 to 40%. Further, a color former, a developer,
The content of the sensitizer in the total amount of the nonvolatile components in the ink composition or the coating composition is 10 to 90%, more preferably 30 to 95%. With these compounding ratios,
In the ink composition, or in the coating composition, when including a color former, a developer, and a sensitizer, as long as the method does not cause the color former to be colored, there is no particular limitation, these are simultaneously, or They can be added separately during the manufacture of the ink composition or the coating composition, or some or all of the color former, developer and sensitizer may be blended at the time of use.

As an example of the ink composition for gravure printing, a color former is a leuco dye, a developer is a methylol compound of a phenolic compound and / or a salt of a phenolic compound, and water / alcohol is used. The water / alcohol-based gravure printing ink composition dissolved in the mixed solvent can (1) easily form a laser-colorable layer in any pattern, and (2) have a high sensitivity to laser irradiation. In addition, marking is possible even if there is an overcoat layer on the color-forming layer, and (3) there is no blank color development (natural coloring) in the ink composition, and a one-component dispersion system is used. It is preferred because it has the advantage of being usable.

Among the leuco dyes that can be used in the water / alcohol-based gravure printing ink composition, fluoran-based dyes are preferable. As the methylolated phenolic compound, methylolated phenol is preferably a salt of phenolic compound. Is preferably a salt of 4,4'-sulfonyldiphenol. As the color developer, it is particularly preferable to use a methylol compound of phenol alone, since it is excellent in the color developability and clarity of the laser-irradiated portion and the non-color developability of the laser non-irradiated portion.

As the binder resin that can be used in the water / alcohol-based gravure printing ink composition, a neutral resin that is soluble in a lower alcohol and is capable of forming a film is preferable. For example, polyamide resin, polyvinyl butyral resin, nitrocellulose Resins or nitrocellulose resins, acrylic resins, vinyl chloride / vinyl acetate copolymer resins, urethane resins, petroleum resins, chlorinated rubber resins, cyclized rubber resins, alkyd resins, and the like. Among them, a polyamide resin is preferable.

The thermosensitive coloring layer 7 may be formed by any method as long as it does not cause coloration of the layer. In addition to gravure printing, printing methods such as flexographic printing and silk screen printing may be used. In addition, it can be performed by a coating method such as roll coating and gravure coating.

The heat-sensitive adhesive layer 12 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. , 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.

Each layer of the hologram seal 6 is formed on a film-like base material 10 having mechanical strength, such as a polyester resin film, in the case of being formed of a synthetic resin by a known coating method or the like. Go.

Materials for the substrate 2 of the adherend include resins such as polyvinyl chloride, polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene, acryl, polypropylene and polyethylene, as well as aluminum, Metal such as copper, paper, and impregnated paper such as resin or latex, or a composite sheet 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 substrate 2 is made of a polyvinyl chloride resin (hereinafter, referred to as a polyvinyl chloride resin).
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 four-layered base material (total thickness 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. In addition, various products that are expensive and are likely to be targeted as counterfeiting and alteration, such as jewelry such as jewelry, watches, ceramics, cosmetics, electric products, and leather products such as bags.

[0070]

EXAMPLES (Example 1) A hologram transfer sheet was manufactured as follows. On one side of a transparent polyethylene terephthalate resin film having a thickness of 25 μm, each of the following layer forming compositions is gravure coated, dried, and a release layer having a thickness of 1.5 μm and a resin layer having a thickness of 2 μm are sequentially formed. On the resin layer, using a hologram master provided with an uneven pattern of interference fringes of the hologram, the fine unevenness was formed by embossing to form a hologram layer, and the fine unevenness of the obtained hologram layer was provided. On the surface,
An aluminum thin film having a thickness of 500 ° was formed by a vacuum evaporation method. In the composition of each layer forming composition, “part” is based on mass.

(Composition for forming release layer) ・ Acrylic resin 40 parts ・ Polyester resin 2 parts ・ Methyl ethyl ketone 50 parts ・ Toluene 50 parts (Hologram layer forming composition) ・ Acrylic resin 40 parts ・ Melamine resin 10 parts ・ Cyclohexane 50 Parts ・ Methyl ethyl ketone 50 parts

A YAG laser having an output of 5 W, a beam spot size of 50 μm, and a wavelength of 1064 nm is focused on the aluminum thin film obtained as described above, using a laser light source, by adjusting the position of the objective lens, and drawing. On the aluminum thin film, variable information, such as a face image of a cardholder and a card number, which is composed of a set of fine apertures, was recorded for each card.

Each of the following layer forming compositions was gravure coated on the aluminum thin film on which the recording was performed, and dried to form a color-forming layer having a thickness of 0.5 μm and a thickness of 2 μm.
Were sequentially formed to obtain a hologram transfer sheet having a laser recording portion.

(Composition for forming color-forming layer) 50 parts of acrylic resin 20 parts of color former (fluoran leuco dye) 20 parts of color developer (phenolic compound) 10 parts of sensitizer (zinc sulfate) Toluene 50 parts ・ Methyl ethyl ketone 50 parts (composition for forming adhesive layer) ・ Vinyl chloride / vinyl acetate copolymer resin 20 parts ・ Acrylic resin 10 parts ・ Ethyl acetate 20 parts ・ Toluene 50 parts

A four-layer structure in which two white core sheets are laminated with transparent upper and lower sheets interposed therebetween and having a thickness of 0.76
mm card base material is prepared, and the hologram transfer sheet obtained above is overlaid so that the adhesive layer side of the hologram transfer sheet is in contact with the card base material.
Transfer was performed under the conditions of a temperature of 10 ° C., a pressure of 10 kg / cm ² and a press time of 1 second, and the polyethylene terephthalate resin film was peeled off to obtain a card having an optical diffraction structure and a laser recording portion.

Example 2 The color-forming layer in Example 1 was formed not on a hologram transfer sheet but on a card base material. That is, the hologram transfer sheet was produced in the same manner as in Example 1, except that the color-forming layer was not formed. A 1 μm thick color-forming layer was formed on the card substrate by hand coating with a wire rod (= Meyers bar) using the same color-forming layer forming composition as used in Example 1. .

A hologram transfer sheet produced without the color-forming layer was transferred onto the color-forming layer provided on the card substrate under the same conditions as in Example 1, and the polyethylene terephthalate resin film was peeled off. A card having a hologram and a laser recording section was obtained.

(Comparative Example) Except that the color-forming layer was not formed,
In the same manner as in Example 1, a hologram transfer sheet was prepared and transferred to a card substrate to obtain a card having a hologram and a laser recording portion.

Using a laser light source for the laser unrecorded portions of the cards obtained in Examples 1, 2 and Comparative Example,
Output 5W, beam spot size 100μm, wavelength 10
By adjusting the position of the objective lens with a 64 nm YAG laser, condensing it on the aluminum thin film, and drawing the image, additional variable information consisting of a set of fine apertures was recorded on the aluminum thin film.

With the recording of the additional variable information, in the cards obtained in the first and second embodiments, the additional recording portion is colored black, and it can be easily visually confirmed that the additional recording has been performed. As a result, it was found that tampering by laser recording was possible, but in the card of the comparative example, the additionally recorded portion was visually indistinguishable from the portion recorded at the beginning, and was altered by laser recording. It turned out to be extremely difficult to determine

[0081]

According to the first aspect of the present invention, since a recording comprising a set of apertures is made on the metal reflecting layer below the light diffraction structure, and a thermosensitive coloring layer is further laminated on the lower surface,
When additional recording is performed on the metal reflective layer of the information recording medium on which recording has been performed in this manner, the thermosensitive coloring layer appears to be colored from the opening, so that it is clear that the additional recording has been performed. Can be provided. According to the invention of claim 2, after recording with a laser beam on the metal reflective layer, the thermosensitive coloring layer is laminated, and then laminated on the base material. Although the heat-sensitive coloring layer can form a color, it is possible to provide a method of manufacturing an information recording medium capable of preventing the heat-sensitive coloring layer from coloring during normal recording. According to the third aspect of the present invention, recording by laser light is performed on the metal reflective layer, and the thermosensitive coloring layer is laminated on the base material in advance and then laminated to form an information recording body. Similar to the invention of item 2, after the product becomes
Although the heat-sensitive coloring layer can be colored by additional recording, it is possible to provide a method of manufacturing an information recording body capable of preventing the heat-sensitive coloring layer from coloring during normal recording. According to the fourth aspect of the present invention, in addition to the effects of the second or third aspect, an information recording medium capable of applying a light diffraction structure with a metal reflective layer on which a recording is formed to a base material by transfer. Can be provided. According to the fifth aspect of the invention, in addition to the effects of the second aspect of the invention,
Since the release layer and / or the protective layer are laminated, when the release layer is laminated, the adhesiveness before peeling and the smoothness of the release are imparted, and when the protective layer is laminated, the surface of the transfer layer has durability. It is possible to provide a method for manufacturing an information recording medium that can improve the performance. According to the invention of claim 6, in addition to the effect of any one of claims 2 to 5,
Since the heat-sensitive adhesive layer, or the anchor layer and the heat-sensitive adhesive layer were laminated on the lower surface of the metal reflective layer laminated on the light diffraction structure or on the lower surface of the thermosensitive coloring layer further laminated on the metal reflective layer, When pasting on the above thermosensitive coloring layer or on the substrate, it can be done efficiently without the trouble of preparing and applying an adhesive, and when accompanied by an anchor layer,
It is possible to provide a method for manufacturing an information recording body in which the adhesiveness of the heat-sensitive adhesive layer to the lower surface of the metal reflective layer or the lower surface of the thermosensitive coloring layer laminated on the metal reflective layer is improved. According to the invention of claim 7, in addition to the effect of the invention of claim 2, the light diffraction structure layer, the metal reflection layer, and the thermosensitive coloring layer are laminated on one film-like substrate at different places. Since the thermosensitive coloring layer is separated at the time of regular recording, the thermosensitive coloring layer is not affected.Lamination of the thermosensitive coloring layer can be performed by folding the film-like base material in two. It is possible to provide a method of manufacturing an information recording medium that can be performed in the same manner as the method of the second invention. According to the invention of claim 8, in addition to the effect of the invention of claim 7, the surface of the film-like base material at the position where the thermosensitive coloring layer is laminated is releasable. It is possible to provide a method for manufacturing an information recording medium that can be easily peeled off from a base material, and can smoothly perform folding of a film-like base material and laminating a thermosensitive coloring layer on a metal reflection side. According to the ninth aspect of the invention, since the layers laminated on the film-like substrate of the light diffraction structure layer with the metal reflection layer can be more easily separated,
Provided is a method for manufacturing an information recording body, which facilitates transfer of a laminated body in which an optical diffraction structure layer, a metal reflective layer on which recording is formed, and a thermosensitive coloring layer are laminated to an adherend substrate by transfer. be able to. According to the tenth aspect, the seventh aspect is provided.
In addition to the effects of any one of claims 9 to 9, since a release layer and / or a protective layer are laminated, when laminating a release layer, stability of adhesiveness before release and smoothness of release are imparted,
When laminating a protective layer, it is possible to provide a method for manufacturing an information recording medium that can improve the durability of the surface of the transfer layer. According to the eleventh aspect of the present invention, the heat-sensitive coloring layer is laminated on the film-like base material with the heat-sensitive adhesive layer interposed therebetween, or with the anchor layer and the heat-sensitive adhesive layer interposed from the heat-sensitive coloring layer side. Since the film-shaped base material is folded in two and the thermosensitive coloring layer is laminated on the metal reflection side, an adhesive is separately prepared and applied when pasting or transferring to the adherend base material. It is possible to provide a method of manufacturing an information recording medium that does not need to be performed.

[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 sectional view of a card.

FIG. 3 is a plan view of a light diffraction structure seal.

FIG. 4 is a diagram showing a method for manufacturing an information recording medium using an optical diffraction structure seal.

FIG. 5 is a diagram showing another method for manufacturing an information recording medium using a light diffraction structure seal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Card 2 Base material (2a; oversheet, 2b; core sheet) 3 Printing 4 Embossed character 5 Magnetic recording layer 6 Light diffraction structure seal 7 Thermal coloring layer 8 Metal reflection layer 9 Light diffraction structure layer 10 Film base 11 Anchor layer 12 Heat-sensitive adhesive layer 13 Protective layer 14 Release layer 15 Light diffraction structure seal intermediate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02B 5/18 G02B 5/32 5/32 G03H 1/18 G03H 1/18 G06K 19/00 R G06K 19 / 08 FF term (reference) 2C005 HA02 HB10 JA01 JA08 JA09 JA18 JA19 JA26 JB08 JB09 JB17 KA01 KA06 KA09 KA10 KA40 KA48 KA51 LA19 LB07 MA02 MB08 PA01 PA14 PA21 PA40 2H049 AA07 AA25 AA15 CA15 A07 CA05 A07 CA05 A07 CA13 CC03 EE04 HH18 5B035 AA15 BB05

Claims (11)

[Claims] 1. A light diffraction structure comprising a laminated structure in which at least a metal reflection layer and a light diffraction structure layer are stacked from the lower surface side, and the light diffraction structure layer is observed from above the adherend substrate with the light diffraction structure layer side as the upper surface side. It is possible to be embedded and laminated in the adherend substrate, or to be laminated on the adherend substrate, and further, the metal reflective layer comprises a set of fine apertures An information recording, wherein a recording is formed, and a thermosensitive coloring layer is laminated on the adherend substrate at a position corresponding to the lower part of the light diffraction structure or the lower part of the light diffraction structure. body. 2. On one surface of a film-shaped substrate, at least an optical diffraction structure layer and a metal reflection layer are sequentially laminated,
Next, using a laser beam, a recording comprising a collection of fine apertures is formed in the metal reflection layer, and after formation of the recording, a thermosensitive coloring layer is laminated on the metal reflection layer to form a recording. After obtaining the finished composite laminated film, the information is characterized in that the record-formed composite laminated film and the adherend substrate are laminated such that the thermosensitive coloring layer side faces the adherend substrate side. Manufacturing method of recording medium. 3. On one surface of a film-shaped substrate, at least a light diffraction structure layer and a metal reflection layer are sequentially laminated,
Next, using a laser beam, to form a record formed of a collection of fine apertures in the metal reflective layer to obtain a recorded formed laminated film, and the thermosensitive coloring layer on the adherend substrate And after laminating, the information recording body, wherein the recording-formed laminated film and the adherend substrate are laminated such that the metal reflective layer and the thermosensitive coloring layer side face each other. Manufacturing method. 4. The method according to claim 1, wherein one surface of the film-shaped base material is a release surface, and the film is formed when the record-formed composite laminate film or the record-formed laminate film is laminated with the adherend substrate. The method for producing an information recording body according to claim 2, wherein the substrate is peeled off. 5. A method of laminating a release layer or a protective layer or laminating the release layer and the protective layer in order before laminating the light diffraction structure layer on the film-like substrate. The method for producing an information recording medium according to claim 2. 6. After laminating the metal reflection layer, a heat-sensitive adhesive layer is laminated on the metal reflection layer, or an anchor layer and the heat-sensitive adhesive layer are laminated in order, and the thermosensitive coloring layer is laminated. In this case, the heat-sensitive adhesive layer is laminated on the heat-sensitive coloring layer, or the anchor layer and the heat-sensitive adhesive layer are sequentially laminated.
5. The method for producing an information recording medium according to any one of items 5 to 5. 7. laminating at least a light diffractive structure layer and a metal reflective layer on one surface of the film-shaped substrate in order, and laminating a thermosensitive coloring layer in different places; And using a laser beam to form a record consisting of a collection of fine apertures in the metal reflective layer, and then folding the film-like substrate with the side on which the layers are laminated on the inside. Then, by laminating the metal reflective layer and the thermosensitive coloring layer, and then, by peeling off the portion of the film-shaped base material laminated with the thermosensitive coloring layer, the film-shaped substrate, light diffraction Structural layer,
After obtaining a recorded composite laminated film on which a recording comprising a collection of the fine apertures is formed, and a thermosensitive coloring layer, the recorded composite laminated film and the adherend base are obtained. 3. The method according to claim 2, wherein the material is laminated. 8. The information recording medium according to claim 7, wherein at least one side of one surface of the film-shaped base is a release surface, and at least a thermosensitive coloring layer is laminated on the release surface. Manufacturing method. 9. The whole surface of one surface of the film-like substrate is a release surface, and the film-like substrate is peeled off when the recorded composite laminated film and the adherend substrate are laminated. 9. The method for producing an information recording medium according to claim 8, wherein 10. A laminating layer or a protective layer, or laminating the peeling layer and the protective layer in order before laminating the light diffraction structure layer on the film-like substrate. The method for manufacturing an information recording medium according to claim 7. 11. A method of laminating a heat-sensitive adhesive layer on the film-like base material or laminating the heat-sensitive adhesive layer and an anchor layer in order prior to laminating the thermosensitive coloring layer. The method for producing an information recording medium according to claim 7.