JPH09297938A - Information recording medium and method of manufacturing the same - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an information recording medium that is difficult to be forged. A substrate, a first recording layer and a protective layer are provided,
At least one of the substrate and the protective layer is a transparent information recording medium, and has a second recording layer arranged so that one surface is in contact with the transparent substrate or the transparent protective layer, and the second recording It is characterized in that the information carried in the layer can be reproduced only from the side surface of the information recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium and its manufacturing method. In particular, the present invention relates to a highly reliable information recording medium and a manufacturing method thereof.

[0002]

2. Description of the Related Art Currently, magnetic recording cards such as credit cards and bank cards are widely used as information recording media carried by individuals. In recent years, IC cards and optical cards have been used as portable information recording media having a larger recording capacity. Etc. have been proposed, and application thereof to electronic money by utilizing the large recording capacity and application of a passbook card recording transaction data with a bank are also considered.

The portable information recording medium for handling such important information about money makes it difficult for an unauthorized person to use the stolen or stolen information recording medium, and also makes it a legitimate information recording medium. It is important to make a structure that is difficult for anyone other than the manufacturer to manufacture, that is, difficult to forge.

As one of the methods, a face photograph and personal information of the cardholder, data of the issuer of the information recording medium and unique marks such as hologram information are used as initial information in the information recording medium. It is generally performed in advance before distributing the.

As a method of attaching the initial information, various methods for making counterfeiting of the information recording medium more difficult are used. For example, the above-mentioned initial information is created on a thin sheet and the sheet is A method of adhering to a card and attaching it is known.

In addition to the attachment of the initial information, a lot of processing for the purpose of preventing forgery is attached.

For example, in a laminated type insertion card in which an information sheet is laminated with a transparent sheet, a method of inserting a watermark pattern or special fine printing is also possible.

By the way, when the information recording medium having a large recording capacity is taken into consideration, it is expected that the social impact when the information recording medium is counterfeited and used is greater than ever. It

For this reason, it is required to add information for preventing forgery to such an information recording medium, which is harder to imitate than ever before.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and an object thereof is to provide an information recording medium which is difficult to forge.

It is another object of the present invention to provide a method of manufacturing an information recording medium that is difficult to forge.

[0012]

An information recording medium according to one embodiment of the present invention comprises a substrate, a first recording layer and a protective layer in this order, and at least one of the substrate and the protective layer has a predetermined wavelength. Information recording medium transparent to light in the area, having a second recording layer arranged so that one surface is in contact with a transparent substrate or a transparent protective layer, and is carried by the second recording layer It is characterized in that the recorded information can be reproduced only from the side surface of the information recording medium under the light of the predetermined wavelength range.

The present invention further comprises a substrate, a first recording layer and a protective layer, and in a method of manufacturing an information recording medium in which the substrate and the protective layer are transparent, a second substrate is provided on the transparent substrate or the transparent protective layer. Forming a recording layer; carried on the second recording layer when the substrate and the protective layer are arranged so that the second recording layer is located between the substrate and the protective layer A concealing layer that enables reproduction of information only from the side surface of the information recording medium,
Between the substrate and the second recording layer, and at least one of the surfaces of the substrate opposite to the side facing the protective layer; and between the protective layer and the second recording layer, and the protective layer. A step of forming on at least one of the surface opposite to the side opposite to the substrate;
And a step of joining the substrate and the protective layer so that the second recording layer is located between them.

The present invention also provides a method of manufacturing an information recording medium comprising a substrate, a first recording layer and a protective layer, wherein the substrate or the protective layer is transparent, and the second recording layer is formed on the transparent layer. Step; the information recording medium carries the information carried on the second recording layer when the substrate and the protective layer are arranged so that the second recording layer is not located between the substrate and the protective layer. Forming a concealing layer that can be reproduced only from the side surface of the second recording layer on the surface opposite to the side facing the transparent layer of the second recording layer;
And a step of joining the substrate and the protective layer so that the second recording layer is not located between them.

According to one embodiment of the present invention, the information which can be reproduced only from the side surface of the information recording medium includes the second recording layer arranged so as to contact the transparent layer of the information recording medium and the second recording layer. It is composed of concealing layers arranged so as to be sandwiched.

When attempting to counterfeit the information recording medium having such a structure, it is necessary to reproduce the manufacturing process from the beginning, and it is necessary to compare the sheet with the initial information recorded thereon with a forgery preventing means. Thus, the number of steps required for manufacturing is remarkably increased, and a more effective anti-counterfeit effect can be obtained as compared with the conventional case.

That is, since the information recognizable only from the side surface is formed so as not to be exposed on the surface of the information recording medium,
It cannot be easily tampered with, and the stolen information recording medium or the found information recording medium can be prevented from being illegally used.

Further, since the information for suppressing forgery is not exposed on the surface of the information recording medium, it does not narrow the display area of the information to be displayed on the surface of the information recording medium.

Furthermore, in recent years, it has been proposed that the portable information recording medium be a hybrid type in which a plurality of information storage means such as an IC chip, an optical recording section, and a magnetic recording section are combined. It is preferable that the electrodes of the chip and the magnetic recording portion are exposed on the surface of the information recording medium, but the information for preventing forgery according to the present invention can be freely arranged on the information recording medium of the IC chip and the magnetic recording portion. Less likely to affect the degree.

[0020]

1 (a) is a schematic perspective view of an optical card according to a first embodiment of the present invention, and FIG. 1 (b) is FIG.
2 is a plan view of the optical card shown in FIG. 2A, and FIG. 2 is a sectional view taken along line AA of the optical card shown in FIG.

In FIGS. 1 (a), 1 (b) and 2, 3 is a substrate for an optical card having a preformat on one surface, and 5 is an optical recording capable of recording and reproducing optical information. Layers (first recording layer) and 7 are protective layers. This protective layer is bonded to the surface of the substrate 3 on which the first recording layer 5 is formed by the adhesive layer 9. Also, 11 is the substrate 3,
A hard coat layer formed on the surface opposite to the side on which the first recording layer is formed. The light beam 13 for recording and reproducing information incident on the first recording layer, for example, in the infrared region. This prevents scratches on the incident surface of a light beam having a wavelength.

The substrate 3 is transparent to the light beam 13 and also transparent to light in the visible region. Further, the protective layer 7 and the adhesive layer 9 are transparent to light in at least the visible region.

Then, the second recording layer 1 carrying predetermined information on the surface of the protective layer 7 opposite to the side facing the substrate 3.
Two stripes 5 are formed by printing with an ink that exhibits a blue color under light in the visible region.

The first concealing layer 17 is arranged on the surface of the substrate 3 opposite to the side facing the protective layer 7. The second recording layer 15 is configured by the first concealing layer 17 so that it cannot be visually recognized from the substrate side of the optical card 1 under visible light. The second recording layer 15 is configured so that it cannot be visually recognized from the protective layer 7 side of the optical card 1 by the second concealing layer 19 arranged on the surface of the protective layer 7.

That is, the substrate 3 side of the optical card 1 and the protective layer 7
From the side, the second recording layer 15 cannot be visually recognized because the hiding layers 17 and 19 are present. However, as shown in FIG. 1A, from the side surface of the optical card 1, a second light is emitted under visible light.
The recording layer can be visually recognized through the substrate 3, the protective layer 7 and the adhesive layer 9 which are transparent to visible light. Since such a second recording layer 15 cannot be recognized from the surface of the optical card by the concealment layers 17 and 19, an easy counterfeit optical card and a regular optical card in which the arrangement of information on the surface of the optical card is simply imitated. Can be identified simply by confirming the presence or absence of the second recording layer.

In order to forge such an optical card, it is necessary to provide the second recording layer 15 so as to contact the transparent protective layer. For example, when the printing layer is to be formed by modifying an existing optical card, first, the concealing layer 19 on the surface of the protective layer is removed to prepare a transparent surface of the protective layer, and then the second recording layer is provided on the transparent surface. Then again the hiding layer 19
It is necessary to go through the steps such as provision of, and forgery requires an extremely large number of procedures. As can be seen from this, the second recording layer 15 improves the difficulty of counterfeiting the optical card and gives the optical card higher reliability.

By the way, the optical card as described above is the second one.
Since the recording layer 15 is not recognized from the card surface, the surface of the concealing layer 17 can be given an arbitrary design. Then, by providing information on the surface of the concealing layer 17 by, for example, printing or the like, the anti-counterfeiting property of the optical card of this embodiment can be further improved. That is, when attempting to forge such an optical card, in addition to the step of providing the second recording layer 15 in contact with the transparent protective layer described above, it is necessary to go through the step of forming print information on the surface of the concealment layer 17, The difficulty of counterfeiting is further enhanced.

The information carried on the second recording layer 15 is not limited as long as it can be identified from the side surface of the optical card 1. Specific examples include the visually recognizable patterns, characters, and patterns as shown in FIG. When the information to be carried on the second recording layer 15 is information that can be visually recognized, the color may be any color as long as it is visually recognizable, and it is particularly preferable to use fluorescent ink or the like to visually check the information. This is preferable for easy reading.

In the optical card according to the above embodiment,
The method of forming the second recording layer 15 is not particularly limited, and the protective layer 7
Any method can be used as long as it can impart desired information to the surface of the. Examples thereof include known printing methods such as a gravure coating method.

The type and color of the information can be changed for each issuer of the optical card, for example, for each credit card company or bank, and even if the card is issued by the same issuer, the color and The information can also be changed, which makes the optical card even more resistant to counterfeiting.

Next, it is preferable that the distance between the second recording layer 15 and the first concealing layer 17 is 150 μm or more, preferably 400 μm or more, because the information can be surely recognized from the side surface of the optical card. As shown in FIG. 2, the second recording layer 15
In the case where the transparent layer between the first concealing layer 17 and the first concealing layer 17 is a laminated film of a plurality of layers made of different materials, the total thickness of the laminated film may meet the above conditions.

Specifically, for example, when the protective layer is fixed on a substrate with an adhesive layer and the adhesive layer is transparent, the total thickness of the protective layer and the adhesive layer should satisfy the above thickness. By so doing, the readability of information carried by the second recording layer from the side surface can be further improved. However, in this case, when the difference in refractive index between layers made of different materials is within 0.2, particularly within 0.1, there is little reflection at the interface between the transparent layers, and the information can be easily recognized from the side surface of the optical card. Can be done accurately.

The second recording layer 1 is used as the hiding layers 17 and 19.
5 is an opaque layer for concealing the second recording layer from the surface of the optical card so that it cannot be recognized under the normal reading condition of information, for example, under the light in the visible region.

Here, the opacity is defined as the transmittance of predetermined reproduction light of the information of the second recording layer 15 being 5% or less, preferably 2% or less.

Examples of such a layer include a printed layer containing a predetermined amount of pigment (titanium oxide, aluminum oxide, etc.) and metal particles (aluminum, etc.), a plastic film, a metal sheet, opaque paper, and the like. The concealing layer composed of the printing layer can be formed, for example, by directly applying the ink containing the above-mentioned pigment or metal particles to the surface on which the concealing layer is to be provided by using a known printing method. When a plastic film, a metal sheet or paper is used as the hiding layer, it can be formed by adhering it to the surface on which the hiding layer is provided with an adhesive or the like.

Further, these concealing layers may be layers for giving other functions to the optical card of this embodiment, or auxiliary layers for giving other functions. That is, for example, as the concealing layer 17, a resin film provided with a magnetic first recording layer that gives a magnetic stripe to this optical card can be used. Further, the concealing layer 19 may be a print layer for providing information on the surface of the protective layer of the optical card or a base layer thereof.

As the material used for the substrate 3 of the optical card according to the present embodiment, any substrate can be used as long as it is an optically recordable and reproducible substrate, such as a glass plate, polycarbonate, polyvinyl chloride, polymethylmethacrylate. And the like, such as a plastic resin substrate.

When at least one of the recording light beam and the reproducing light beam is made incident on the first recording layer 5 through the optical card substrate 3, the substrate surface is protected from scratches and dust, and is transparent and scratch-resistant. Specific examples of the layer 11 include thin films of photocurable resin, epoxy resin, acrylic resin, silicon resin, and the like.

On the surface of the optical card substrate 1, a magnetic stripe, card design printing, bar code, OCR
It is possible to provide characters, holograms, sign panels, and so on, which are provided in general credit cards and the like.

Any material can be used for the first recording layer 5 as long as it is a material used for an optical recording material capable of recording / reproducing and / or erasing with a laser beam, and an organic dye recording material or a metal recording material can be used. . Also,
There may be other layer configurations such as a reflective layer and an undercoat layer.

As the adhesive layer 9, a conventionally known ordinary adhesive can be used. For example, vinyl acetate, acrylic acid ester, vinyl chloride, ethylene, acrylic acid, polymers and copolymers of vinyl monomers such as acrylamide, polyamide, polyester, thermoplastic adhesives such as epoxy resins, amino resins (urea resins, Melamine resin),
Adhesives such as phenol resin, epoxy resin, urethane resin, thermosetting vinyl resin and the like, and rubber type adhesives such as natural rubber, nitrile rubber, chloro rubber, silicone rubber and the like are used.

The protective layer 7 needs to be transparent, and the same material as that of the optical card substrate in the case where the above-mentioned transparency is required can be used.

Further, an IC chip may be embedded in at least one of the substrate 3 and the protective layer 7 of the optical card of the present embodiment to form a hybrid card capable of recording by both optical recording and IC recording.

In FIG. 3, the first concealing layer 17 of the optical card having the structure shown in FIGS. 1 and 2 is provided with the transparent substrate 3 and the transparent adhesive layer 9.
FIG. 4 shows a structure in which the first concealing layer 17 of the optical card having the structure shown in FIGS. 1 and 2 is arranged between the transparent protective layer 7 and the transparent adhesive layer 9. Is shown.

Next, the structure of an optical card according to another embodiment will be described with reference to FIGS.

5 (a), 5 (b), 5 (c), 6 (a) and 6 (b) respectively show the second recording layer 15 between the substrate of the optical card and the protective layer. Figure 1 (a) and Figure 1
The configuration differs from the optical card disclosed in (b) and FIG.

Specifically, in the configurations shown in FIGS. 5 (a), 5 (b) and 5 (c), the second recording layer is arranged between the protective layer 7 and the adhesive layer 9. 6A and FIG. 6B show the second recording layer arranged between the adhesive layer 9 and the substrate 3.

In the above structure, the first hiding layer 1
7 is preferably arranged on the surface of the substrate 3 opposite to the surface facing the protective layer 7, or on at least one of the second recording layer 15 and the substrate 3. The second concealing layer 19 is preferably disposed on the surface of the protective substrate 7 opposite to the side facing the substrate 3 and at least one of the protective substrate 7 and the second recording layer 15.

When the first masking layer 17 is arranged between the substrate 3 and the second recording layer, the second masking layer 19 is on the side of the protective layer 7 opposite to the side facing the substrate 3. It is preferable to dispose the first concealing layer 17 on the surface of the substrate 3 facing the protective layer 7 when the second concealing layer is disposed between the protective layer 7 and the second recording layer 15. Is preferably arranged on the opposite surface. With this arrangement, the thickness of the transparent layer in contact with the second recording layer can be increased, and it becomes easy to recognize the information carried by the second recording layer from the side surface of the optical card 1.

For example, in the configuration of FIG.
The hiding layer 17 is disposed on the surface of the substrate 3 opposite to the side facing the protective layer 7, and the second hiding layer 19 is the protective layer 7.
On the surface opposite to the side facing the substrate 3. In FIG. 5B, the first hiding layer 17 is replaced by the second recording layer 15
The structure provided on the surface of the side facing the substrate of FIG.

Further, in FIG. 5C, the second concealing layer 1
9 shows a structure in which 9 is provided between the protective layer 7 and the second recording layer 15.

In the structure of FIG. 6A, the first concealing layer is disposed on the surface of the substrate 3 opposite to the side facing the protective layer 7, and the second concealing layer is the protective layer 7 of the substrate. It is arranged on the surface opposite to the side opposite to 3.

Furthermore, FIG. 6B shows the first concealing layer 17
Is disposed between the substrate 3 and the second recording layer 15, and the second concealing layer 19 is disposed on the surface of the protective layer 7 opposite to the side facing the substrate 3.

In the structure shown in FIGS. 7A, 7B and 7C, the second recording layer 15 is formed on the surface of the substrate 3 opposite to the side facing the protective layer 7. The configuration is different from the optical card disclosed in FIGS. 1A, 1B and 2 in the point.

In the above structure, the first hiding layer 1
7 is disposed on the surface of the second recording layer 15 opposite to the surface facing the substrate 3, and the second concealing layer 19 is the surface of the protective layer 7 opposite to the surface facing the substrate 3. Also, it is preferable to dispose on at least one of the protective layer 7 and the second recording layer 15. Specifically, for example, in the configuration of FIG.
The hiding layer 17 is disposed on the surface of the second recording layer 15 opposite to the side facing the substrate 3, and the second hiding layer 19 is the protective layer 7.
On the surface opposite to the side facing the substrate 3.

In FIG. 7B, the first concealing layer 17 is the second
The configuration is shown in which the second concealing layer 19 is disposed on the surface of the recording layer 15 opposite to the side facing the protective layer 7, and the second concealing layer 19 is disposed between the protective layer 7 and the adhesive layer 9.

Further, FIG. 7C shows that the second concealing layer 19 is arranged between the adhesive layer 9 and the substrate 3 in FIG.
This is different from the configuration shown in (b).

FIGS. 8 and 9 show an optical card having a structure in which a reflection layer 21 is added to the optical cards shown in FIGS. 1 (a), 1 (b) and 2. That is, in FIG. 8, the reflective layer 21 is formed on the side of the protective layer 7 facing the substrate 3. Further, the reflective layer 21 is constructed so that the presence of the optical card cannot be recognized when the optical card is viewed from the substrate 3 side by the first concealing layer 17.

When the reflective layer 21 is provided on the second recording layer 15 via the transparent layer in this way, the second recording layer 15
There is an advantage that recognition from the side of is easier.
Further, since it becomes possible to read the information inside from the end of the card, it is effective when it is desired to carry a large amount of information such as characters on the second recording layer 15.

The reflective layer 21 can be formed, for example, by adhering a metal foil or a resin film obtained by vapor-depositing a metal at a desired position with an adhesive or the like.

The position of the reflective layer 21 is not limited to the surface of the protective layer 7 opposite to the side on which the second recording layer 15 is formed. For example, when the adhesive layer 9 is transparent, the adhesive layer 9 and the substrate are Three
Or the interface between the substrate 3 and the transparent protective layer 11, or the interface between the transparent protective layer 11 and the hiding layer 17.

Further, as shown in FIG. 9, the second recording layer 15
A reflective layer 21 may be disposed between the second concealing layer 19 and the second concealing layer 19 so as to be in contact with the second recording layer 15. In this case the second
The effect of improving the contrast of the information carried by the recording layer and facilitating the reproduction of the information can be expected.

The reflecting layer 21 is not inserted, and the first hiding layer 1
7. A metal is vapor-deposited on at least one of the surface of the second concealing layer 7 facing the second recording layer and the surface of the second concealing layer 19 facing the second recording layer,
Alternatively, the function equivalent to that of the reflective film can be achieved by sputtering to form a reflective surface.

This reflective layer 21 can be applied to all of the optical cards shown in FIGS. For example, in the configuration shown in FIG. 3, 1 between the hiding layer 17 and the transparent protective layer 11, between the transparent protective layer 11 and the substrate 3, and between the substrate 3 and the adhesive layer 9.
It can be placed in any place. Further, a reflective layer may be provided between the second recording layer 15 and the protective layer 7, and between the concealing layer 17 and the transparent protective layer 11, between the transparent protective layer 11 and the substrate 3, and between the substrate 3 and the adhesive layer 9. 1 position, the second recording layer 15 and the protective layer 7
It can also be placed in two places between.

As described above, the reflective layer is formed by the first concealing layer 17 and the second concealing layer.
Even when arranged between the recording layers 15 and between the second concealing layer 19 and the second recording layer, at least one surface of the second recording layer is a transparent member such as the protective layer 7 or the adhesive layer 9. Is preferably in contact with.

Further, in the configuration shown in FIG. 6 (a),
The reflective layer 21 is provided between the first hiding layer 17 and the second recording layer 15, for example, between the first hiding layer 17 and the protective layer 11, between the protective layer 11 and the transparent substrate 5, and between the transparent substrate 3 and the second recording layer 15. It can be placed at one place between.

The reflective layer 21 is provided between the second recording layer 15 and the second concealing layer 19, for example, between the second recording layer 15 and the adhesive layer 9.
You may provide in one place between the adhesive layer 9 and the transparent protective layer 7, and between the transparent protective layer 7 and the 2nd concealment layer 19.

A reflective layer may be provided both between the first concealing layer 17 and the second recording layer 15 and between the second concealing layer and the second recording layer. Even in this case, it is preferable that at least one surface of the second recording layer 15 is in contact with the transparent member, for example, the transparent substrate 1 or the transparent adhesive layer 9.

Furthermore, in the structure shown in FIG. 7A, the reflective layer 21 can be arranged between the first concealing layer 17 and the second recording layer 15. Alternatively, the reflective layer 21 includes the transparent adhesive layer 9 and the transparent protective layer 7 between the transparent substrate 3 and the transparent adhesive layer 9.
In between, the transparent protective layer 7 and the second concealing layer 19 may be arranged at one place. Further, the reflective layer includes the first concealing layer 17 and the second concealing layer 17.
Between the recording layer 15 and between the transparent substrate 3 and the transparent adhesive layer 9,
Between the transparent adhesive layer 9 and the transparent protective layer 7, the transparent protective layer 7 and the second
You may provide in both of the one place between the concealment layers 19.

In the optical card having the structure shown in FIG. 3 to FIG. 7, reflection is reflected both between the first concealing layer 17 and the second recording layer 15 and between the second recording layer 15 and the second concealing layer 19. When arranging the layers, it is preferable that at least one surface of the second recording layer is in contact with a transparent member such as the transparent substrate 1, the transparent adhesive layer 9 or the transparent protective layer 7. With such a configuration, it becomes easier to reproduce the information carried by the second recording layer from the side surface of the optical card.

In the optical card having the structure shown in FIGS. 5 to 7, the protective layer 7 may be opaque to the light used for reproducing the information carried by the second recording layer 15, for example, the light in the visible region. Good. For example, in FIG. 10, the protective layer 7 of the optical card having the configuration shown in FIG.
In this case, the second concealing layer 19 in FIG. 5A can be omitted. In the optical card having the structure shown in FIGS. 2 to 6, the substrate 3 is the second recording layer 15
It may be opaque to the light used for reproducing the information carried by, for example, the light in the visible region. For example, FIG. 11 shows the optical card shown in FIG. 2 in which the substrate 3 is an opaque substrate 25. And in such a configuration, the first concealing layer 17
Can be omitted. When the opaque substrate is also opaque to the recording light beam for recording information on the first recording layer or the reproducing light beam for recording information on the first recording layer, this recording / reproducing light beam is used. The second concealing layer 19 is preferably provided at a position that does not interfere with the recording of information on the first recording layer and the reproduction of information on the first recording layer, because the light needs to enter through the protective layer 7.

The above-mentioned reflective layer can also be introduced into an optical card provided with an opaque substrate or an opaque protective layer. For example, in the optical card having the configuration shown in FIG. 10, between the first concealing layer 17 and the surface protective layer 11, the surface protective layer 11
It is possible to dispose the reflection layer between the transparent substrate 3 and the transparent substrate 3, and further at one position between the transparent substrate 3 and the transparent adhesive layer 9.

Similarly, in the optical card shown in FIG. 11, between the opaque substrate 25 and the transparent adhesive layer 9, between the transparent adhesive layer 9 and the transparent protective layer 7, and between the second recording layer and the second concealing layer 19. The reflective layer 21 can be arranged.

Next, FIG. 12A and B- in FIG.
The optical card shown in FIG. 12B, which is a sectional view taken along the line B, relates to still another embodiment of the present invention. FIG. 12
In FIGS. 12A and 12B, the first recording layer 5 is a region 1 on the surface of the substrate 3 on which the preformat is formed.
No. 01, which is made of a metallic material.
The first recording layer 5 can function as the reflective layer 21.

Since the first recording layer 5 is opaque, the first recording layer 5 is formed on the substrate 3, and the protective layer 7 is formed.
Of the second recording layer 15 in a region overlapping with the first recording layer forming region of
In the case of providing, the first recording layer can have the functions of the reflective layer 21 and the concealing layer 19. Then, the information on the second recording layer 15 is reproduced only from the side surface of the optical card through the transparent protective layer 7 or the transparent protective layer 7 and the transparent adhesive layer 9, and the presence of the reflective layer causes the side surface of the optical card of the information to be reproduced. The visibility from is good.

Next, the present invention will be described in more detail by way of examples.

The present invention is not limited to the contents described in the examples below.

In each of the following Examples and Comparative Examples, the transmittance of the opaque hiding layer was measured by a spectrophotometer (trade name: MCP
D-1000; manufactured by Otsuka Electronics Co., Ltd.).

Example 1 An optical card having the structure shown in FIG. 5B was manufactured as follows.

(Preparation of transparent protective layer 7 having first recording layer 15 and second concealing layer 19) Length 100 mm, width 100 m
m, 0.3 mm thick transparent substrate of polycarbonate, black ink (trade name: Sericol 13-911 Black; Teikoku Ink Mfg. Co., Ltd.) ) Company made), thickness of 20 microns, visible light transmittance of 2%
The following opaque black print layer was formed by gravure printing.

Then, a blue two-component curable urethane acrylate-based ink (trade name: HAC ink medium) is formed at a predetermined position (the position where the second recording layer 15 is formed in FIG. 13) on the other surface of the polycarbonate transparent substrate. 3 parts by weight of a blue pigment (product number 440) having an average particle size of 5 μm in 10 parts by weight, HAC
Ink mixed with 1 part by weight of an ink curing agent; all made by Seiko Advance Co., Ltd.) width 3 mm, length 1
The second recording layer 15 having two 0 mm stripes was formed. Next, a white ink obtained by adding 3 parts by weight of a titanium oxide pigment to 10 parts by weight of a vinyl chloride ink so as to cover the second recording layer 15 (trade name: Sericol 13-611).
White; manufactured by Teikoku Ink Co., Ltd. was used to form a 20-micron-thick opaque first concealing layer 17 having a transmittance of 2% or less for visible light by gravure printing.

(Preparation of transparent substrate 3 having first recording layer 5 and surface protection layer 11) 100 mm long, 100 mm wide,
A urethane acrylate-based UV curable resin (trade name: Uni) on the surface of the polycarbonate-made transparent substrate with a thickness of 0.4 mm, which has a preformat for optical cards formed on one surface, on the side without the preformat. Dick; manufactured by Dainippon Ink and Chemicals, Inc. was spin-coated to a thickness of 4 μm and cured using a UV lamp (80 W / cm) to form a transparent hard coat layer (transparent protective layer 11). Further, in the optical recording area (25 in FIG. 13) on the preformat forming surface of the polycarbonate substrate,
3w of 1,5,5-tetrakis (p-diethylaminophenyl) -2,4-pentadienium perchlorate
A t% diacetone alcohol solution was applied by a gravure coating method and dried to form a first film having a thickness of 1000 angstrom.
The recording layer 5 was formed.

(Production of Optical Card) The transparent protective layer 7 and the substrate 3 produced as described above are used as the first concealing layer 17 and the first recording layer 5.
And 60 μm thick ethylene vinyl acetate hot melt adhesive (trade name: hirodine 758
0; manufactured by Hirodyne Industry Co., Ltd.) and then cut into optical card sizes of 85.6 mm in length and 54 mm in width to obtain an optical card.

When the side surface of the thus obtained optical card where the second recording layer is exposed is observed, two blue stripes can be visually recognized through the transparent protective layer 7 having a thickness of 0.3 mm. On the other hand, this optical card from the substrate side and the protective layer side,
As a result of observing the optical card so as to face it, the second recording layer 15 could not be visually recognized.

(Embodiment 2) FIG. 10B is carried out as follows.
An optical card having the configuration described in 1. was produced.

(Preparation of transparent substrate 3 having first recording layer 5, second recording layer 15, surface protective layer 11 and first concealing layer 17) Length 100 mm, width 100 mm, thickness 0.4 mm, one of Urethane acrylate UV-curable resin (trade name: Unidick; Dainippon Ink and Chemicals, Inc.) on the surface of the polycarbonate transparent substrate on which the optical card preformat is formed, on the side where the preformat is not formed. 4 μm in thickness was spin-coated with a UV lamp (80 W / cm) and cured to form a transparent hard coat layer (transparent protective layer 11). Further, 1,1,5,5-tetrakis (p is added to the optical recording area (5 in FIG. 13) on the preformat forming surface of the polycarbonate substrate.
-Diethylaminophenyl) -2,4-pentadienium perchlorate solution of 3 wt% in diacetone alcohol is applied by a gravure coating method and dried to a thickness of 1000.
The first recording layer 5 of Angstrom was formed. Next, a red two-component curable urethane acrylate-based ink (trade name: HAC) is placed at a predetermined position (the position where the second recording layer 15 in FIG. 13 is formed) on the side where the first recording layer is formed on this substrate. Ink medium 10 parts by weight with an average particle size of 5 μm
3 parts by width of 3 mm and length of 10 mm are mixed with 3 parts by weight of the red pigment (product number 500) and 1 part by weight of an HAC ink curing agent made of an isocyanate resin; both are manufactured by Seiko Advance Co., Ltd. The second recording layer 15 having the stripes was formed.

Further, a black two-component curable urethane acrylate ink (trade name: on the transparent protective layer 11 of the substrate) corresponding to the region where the second recording layer 15 is formed.
HAC ink medium 10 parts by weight, 3 parts by weight of a black pigment (product number 710) having an average particle size of 5 μm, HAC ink curing agent 1
Inks mixed with parts by weight; all manufactured by Seiko Advance Co., Ltd. were printed using a screen plate of mesh 200 to form a printing layer having a dry film thickness of 10 μm. This printed layer had a transmittance of 2% or less with respect to visible light, and this printed layer was used as the first concealing layer 17 for concealing the second recording layer 15.

(Preparation of Protective Layer 23 Opaque to Visible Light) Used in Example 1 having a thickness of 20 μm on one surface of a white vinyl chloride sheet having a length of 100 mm, a width of 100 mm, and a thickness of 0.3 mm. White ink (Product name: Sericol 13-
611 white; Teikoku Ink Co., Ltd. was used for printing to prepare a substrate completely opaque to visible light.

(Fabrication of Optical Card) The substrate 3 and the protective layer 23 prepared and prepared as described above are thickened so that the first recording layer 5 of the substrate and the printing layer non-forming surface of the protective layer 23 face each other. A hot melt adhesive (trade name: Evaflex 7580; manufactured by Hirodyne Industry Co., Ltd.) made of an ethylene-vinyl acetate copolymer having a length of 60 μm is used for bonding, and then a vertical length of 8
An optical card was obtained by cutting into an optical card size of 5.6 mm and width 54 mm.

When the side surface of the thus obtained optical card where the second recording layer is exposed is observed, two red stripes can be visually recognized through the transparent substrate 3 having a thickness of 0.4 mm. On the other hand, as a result of observing the optical card from the substrate side and the protective layer side so as to face the optical card, the second recording layer 15 could not be visually recognized.

(Embodiment 3) As shown in FIG.
An optical card having the structure shown in was prepared.

(Preparation of transparent substrate 3 provided with first recording layer 5, first concealing layer 17, second recording layer 15 and surface protective layer 11) Length 100 mm, width 100 mm, thickness 0.4 mm, one of Urethane acrylate UV-curable resin (trade name: Unidick; Dainippon Ink and Chemicals, Inc.) on the surface of the polycarbonate transparent substrate on which the optical card preformat is formed, on the side where the preformat is not formed. 4 μm in thickness was spin-coated with a UV lamp (80 W / cm) and cured to form a transparent hard coat layer (transparent protective layer 11). Further, 3 wt% of 1,1,5,5-tetrakis (p-diethylaminophenyl) -2,4-pentadienium perchlorate was added to the optical recording area (5 in FIG. 13) on the preformat forming surface of the polycarbonate substrate. Apply diacetone alcohol solution by gravure coating method and dry to a thickness of 10
A first recording layer 5 of 00 angstrom was formed.

Next, the first position is provided at a position including the predetermined position (the position where the second recording layer 15 of FIG. 13 is formed) on the preformat formation surface side of this substrate and not interfering with the first recording layer 5. The white ink used in Example 1 (trade name: Sericol 13-611 White; manufactured by Teikoku Ink Co., Ltd.) was gravure-printed as the concealing layer 17 to form a white opaque printing layer having a thickness of 20 μm. Next, the second recording layer 15 was formed on the first hiding layer 17 in the same manner as in Example 1.

(Preparation of Protective Layer 7 with Second Concealing Layer 19) The white ink used in Example 1 (product) on one surface of a polycarbonate transparent substrate 100 mm long, 100 mm wide, and 0.3 mm thick. Name: Sericor 13-611 white;
Gravure printing was performed with Teikoku Ink Co., Ltd. to provide a card printing layer having a thickness of 20 μm and a visible light transmittance of 2% or less, and this card printing layer was used as a second concealing layer.

(Production of Optical Card) The substrate 3 and the protective layer 7 prepared and prepared as described above are arranged so that the first recording layer 5 of the substrate 3 and the surface of the protective layer 7 on which the second concealing layer is not formed face each other. Then, in the same manner as in Example 1, the optical card was produced by bonding and punching.

Observing the side surface of the thus obtained optical card where the second recording layer is exposed, two blue stripes have a transparent adhesive layer and a transparent protective layer 7 having a thickness of 0.3 mm.
It was possible to visually recognize through. On the other hand, this optical card
As a result of observation from the protective layer side so as to face the optical card, the second recording layer 15 could not be visually recognized.

Reference Example A transparent substrate 3 having a first recording layer 5, a first concealing layer 17, a second recording layer 15 and a surface protective layer 11 was prepared in the same manner as in Example 3.

Protective layer 2 used in the optical card of Example 3
The same protective layer 23 as 3 was prepared.

The substrate 3 and the protective layer 23 were bonded in the same manner as in Example 1 so that the first recording layer 5 of the substrate 3 and the printed layer forming surface of the protective layer 23 faced, and punched and cut. An optical card was made.

Observing the side surface of the thus obtained optical card where the end portion of the second recording layer is exposed, the thickness of the transparent layer in contact with one surface of the second recording layer is the thickness of the transparent adhesive. It was difficult to visually recognize the two blue stripes because it was only 60 μm.

Example 4 An optical card having the structure shown in FIG. 8 was manufactured as follows.

(Preparation of protective layer 7 including second recording layer 15, second concealing layer 19 and reflective layer 21) Length 100 mm, width 1
A transparent substrate made of polycarbonate having a thickness of 00 mm and a thickness of 0.3 mm is prepared, and second recording is performed at a predetermined position on one surface (a position where the second recording layer 15 of FIG. 13 is formed) in the same manner as in Example 1. Layer 15 was formed. Then, the opaque white ink used in Example 1 (trade name: Sericol 13-611 White; Teikoku Ink Co., Ltd.) was used so that the entire surface of the substrate on which the second recording layer 15 was formed was covered with the second recording layer 15. ) Was applied by gravure to form a printing layer having a thickness of 20 μm, which was used as the second concealing layer 19.

Next, a 15 μm-thick aluminum foil is hot-stamped with a hot stamp on the surface of the substrate opposite to the surface on which the second recording layer is formed, at a position corresponding to the second recording layer forming region. The reflective layer 23 was formed.

(Preparation of transparent substrate 3 provided with first recording layer 5, surface protection layer 11 and first concealing layer 17) Length 100 mm,
100 mm wide, 0.4 mm thick, a polycarbonate transparent substrate with a preformat for optical cards formed on one surface, and a urethane acrylate UV-curable resin (product name) on the surface without the preformat. : Unidick; manufactured by Dainippon Ink and Chemicals, Inc., spin-coated to a thickness of 4 μm, and UV lamp (80 W / c)
m) was used for curing to form a transparent hard coat layer (transparent protective layer 11). Furthermore, an optical recording area (2 in FIG. 13) on the preformat forming surface of this polycarbonate substrate is used.
A solution of 1,1,5,5-tetrakis (p-diethylaminophenyl) -2,4-pentadienium perchlorate in 3 wt% diacetone alcohol was applied to 5) by a gravure coating method, and dried to a thickness of 1000 angstrom. The first recording layer 5 was formed.

On the transparent protective layer 11 of the substrate, the visible light transmittance for hiding the second recording layer 15 is 2%.
The following first concealment layer 17 is formed by using a white two-component curable urethane acrylate-based ink (trade name: HAC ink medium 1).
White pigment with an average particle size of 5 μm in 0 part by weight (Product No. 120) 3
An ink obtained by mixing 1 part by weight of HAC ink curing agent and 1 part by weight of HAC ink; both were manufactured by Seiko Advance Co., Ltd. to form a dry film thickness of 20 μm.

(Production of Optical Card) The protective layer 7 and the substrate 3 produced as described above are replaced with the reflective layer 21 of the protective layer 7 and the first substrate 3
An optical card was obtained by combining the recording layers 5 so as to face each other in the same manner as in Example 1 and punching and cutting.

When the side surface of the thus obtained optical card where the second recording layer is exposed is observed, two blue stripes can be visually recognized through the transparent protective layer 7 having a thickness of 0.3 mm. On the other hand, this optical card from the substrate side and the protective layer side,
As a result of observing the optical card so as to face it, the second recording layer 15 could not be visually recognized.

Example 5 An optical card having the structure shown in FIG. 12 was produced as follows.

(Preparation of Transparent Substrate 3 Having First Recording Layer 5) A polycarbonate transparent substrate having a length of 100 mm, a width of 100 mm, and a thickness of 0.4 mm, on one surface of which a preformat for an optical card is formed, A urethane acrylate UV curable resin (trade name: Unidick; manufactured by Dainippon Ink and Chemicals, Inc.) was spin-coated to a thickness of 4 μm on the surface on which the preformat was not formed, and a UV lamp (80 w / cm) ) Was used to form a transparent hard code layer (transparent protective layer 11). Further, a tellurium oxide film having a thickness of 12 is formed in a predetermined region (101 in FIG. 12A) on the preformat formation surface of the polycarbonate substrate.
The first recording layer 5 was provided by vapor deposition to 00 angstrom.

(Preparation of transparent protective layer 7 having second recording layer 15 and second concealing layer 19) Length 100 mm, width 100 m
In the first embodiment of the first embodiment, the characters "OPTICAL CARD" are horizontally reversed in a region of one surface of a polycarbonate transparent substrate having a thickness of 0.3 mm and a thickness of 0.3 mm, which overlaps the first recording layer 5 of the substrate prepared above. The same blue ink as that used for forming the two recording layers was printed to form the second recording layer 15, and the white ink used in Example 1 so as to cover the second recording layer 15 (trade name: Sericol 13). -611 White; Teikoku Ink Co., Ltd. product, 20 μm thick opaque printing layer with visible light transmittance of 2% or less (second concealing layer 19)
Was formed.

(Production of Optical Card) Substrate 3 produced above
And the protective layer 7 as the first recording layer of the substrate 3 and the second recording layer of the protective layer 7.
The optical card was obtained by bonding in the same manner as in Example 1 so that the surface on which the recording layer 15 was not formed was opposed, and punching and cutting.

The character information provided inside the optical card thus obtained is visually recognized as a result of observing the optical card from the substrate side and the protective layer side so as to face the optical card. I couldn't. But the first of the optical cards
When the side surface where the recording layer is exposed is observed, the surface of the first recording layer 5 facing the second recording layer 15 functions as the reflective layer 21, and the character information carried by the second recording layer is reflected, It could be visually recognized through the transparent adhesive layer 9 and the transparent protective layer 7.

Example 6 An optical card having the structure shown in FIG. 7C was manufactured as follows.

(Production of Transparent Substrate 3 Having First Recording Layer 5, Second Recording Layer 15, First Concealing Layer 17, Second Concealing Layer 19 and Surface Protective Layer 11) Length 100 mm, Width 100 mm, Thickness 0 4 mm, urethane acrylate UV curable resin (trade name: Unidick; large) on the entire surface of the polycarbonate-made transparent substrate on one side of which the preformat for optical cards is not formed, on the side where the preformat is not formed. Made by Nippon Ink Chemical Co., Ltd. to a thickness of 4 μm
Coating by bar coating method, UV lamp (80W / cm)
Was irradiated and cured to form the surface protective layer 11. Next, a transparent two-component curable urethane acrylate-based ink (trade name: as a receiving layer for providing the magnetic stripe on the surface protective layer 11 at the position where the magnetic stripe is provided)
An ink in which 1 part by weight of a HAC ink curing agent is mixed with 10 parts by weight of a HAC ink medium; both are manufactured by Seiko Advance Co., Ltd., and a red two-component curable urethane acrylate ink (trade name: 10 parts by weight of a HAC ink medium). 1 part by weight of a HAC ink curing agent was further mixed with 3 parts by weight of a red pigment having an average particle size of 5 μm (product number 510); all were manufactured by Seiko Advance Co., Ltd. As shown, a red ink is used in the pattern portion of the second recording layer 15 provided at a position corresponding to the edge of the card, and a transparent ink is used in the other portion where the magnetic stripe is provided. Magnetic stripe receiving layer consisting of a red second recording layer having a thickness of 10 μm and a printing layer made of transparent ink Was formed.

Then, an opaque magnetic tape (product name: ISO-GE00-11 having a width of 11.4 mm and having an adhesive layer on the back surface and having a transmittance of 2% or less for visible light).
4; manufactured by Tokyo Magnetic Printing Co., Ltd.) and used as the first concealing layer 17 for concealing the second recording layer 15 by overlapping and adhering the adhesive layer of the magnetic tape and the above-mentioned receiving layer (FIG. 1 of 14
7).

3-tetrakis (p-diethylaminophenyl) -2,4-pentadienium perchlorate
A wt% diacetone alcohol solution was applied by a gravure coating method and dried to form a first recording layer 5 having a thickness of 1000 Å. Further, the white ink (trade name: Sericol 13-611 white; Teikoku) used in Example 1 was formed in a region corresponding to the region in which the second recording layer 15 was formed on the surface of the substrate on which the preformat was formed. Ink Co., Ltd. was printed to a thickness of 20 μm to form the second concealing layer 19 having a visible light transmittance of 2% or less.

The protective layer 7 has a length of 100 mm and a width of 100.
A transparent substrate made of polycarbonate having a thickness of 0.3 mm and a thickness of 0.3 mm was prepared.

The above-prepared substrate 3 and protective layer 7 are arranged so that the first recording layer 5 of the substrate 3 faces the protective layer 7.
They were joined in the same manner as in Example 1 and punched and cut to obtain an optical card.

When the side surface of the thus obtained optical card where the second recording layer was exposed was observed, the barcode could be visually recognized through the transparent substrate having a thickness of 0.4 mm. On the other hand, as a result of observing the optical card from the substrate side and the protective layer side so as to face the optical card, the second recording layer 15 could not be visually recognized.

(Embodiment 7) The second recording layer inside the magnetic stripe of Embodiment 6 is arranged in 5 digit numbers of 1 mm square and the concealing layer 72.
Was prepared in the same manner as in Example 6 except that was provided on the side of the protective substrate that was in contact with the adhesive layer.

Although the information of the second recording layer could not be confirmed from the card surface side, a 5-digit number could be confirmed from the end portion.

(Embodiment 8) In Embodiment 6, the second recording layer 15 on the inner side of the magnetic stripe is 2 × 5 from the bar code.
An optical card was prepared in the same manner as in Example 6 except that the second hiding layer 19 was formed on the surface of the protective layer 7 opposite to the side in contact with the adhesive layer 9, and the second hiding layer 19 had a pattern of mm.

Observation of the side surface of the thus obtained optical card exposing the second recording layer revealed that the transparent substrate had a thickness of 0.4 mm, the transparent adhesive layer had a thickness of 60 μm, and the thickness of 0.3.
The pattern could be visually recognized through the mm transparent protective layer. On the other hand, as a result of observing the optical card from the substrate side and the protective layer side so as to face the optical card, the pattern could not be visually recognized.

(Example 9) (Preparation of magnetic tape having second recording layer on surface) Red two-component curable urethane acrylate ink (10 parts by weight of HAC ink medium was mixed with 1 part by weight of HAC ink curing agent). , And a red pigment with an average particle size of 5 μm (Part No. 510)
An ink prepared by mixing 3 parts by weight; all prepared by Seiko Advance Co., Ltd. was prepared, and the magnetic tape (trade name: ISO-GE00-114; manufactured by Tokyo Magnetic Printing Co., Ltd.) used in Example 6 was prepared. Gravure printing is performed on an adhesive layer provided in advance on the back surface of the magnetic recording surface and at a position corresponding to the edge of the card, and two magnetic tapes with a thickness of 10 μm, a width of 3 mm, and a length of 10 mm are formed. Second consisting of stripes
A recording layer was provided.

(Preparation of Transparent Protective Layer 7 Comprising the Second Concealing Layer 19 and the Second Recording Layer 15) As the transparent protective layer 7, a length of 10 was used.
A transparent polycarbonate substrate having a thickness of 0 mm, a width of 100 mm and a thickness of 0.3 mm was prepared, and a magnetic tape having a second recording layer on the surface was laminated so that the second recording layer side was in contact with the protective layer 7, and then at 100 ° C. The protective layer and the magnetic tape were integrated by pressing, and a transparent protective layer 7 having a second recording layer 15 was prepared in which a magnetic stripe having a visible light transmittance of 2% or less was used as a second concealing layer.

(Production of Transparent Substrate 3 Having First Recording Layer 5, Surface Protective Layer 11 and First Concealing Layer 17) In the same manner as in Example 4, the first recording layer 5, the surface protective layer 11 and the 1 A transparent substrate having the hiding layer 17 was prepared.

(Production of Optical Card) With respect to the protective layer 7 and the substrate 3, the surface of the protective layer 7 on which the second recording layer and the magnetic stripe are not provided faces the first recording layer side of the substrate 3. In this way, the optical card was obtained by combining the same as in Example 1 and punching and cutting.

When the optical card thus obtained was observed under visible light, a red stripe was visually recognizable from the side surface of the optical card through the transparent substrate, the transparent adhesive layer and the transparent protective layer. On the other hand, when the optical card was observed from the substrate side and the protective layer side so as to face the optical card, the second recording layer 15 could not be visually recognized.

(Embodiment 10) In Embodiment 9, the second recording layer is a 1-mm square with 5 digits, and the first concealing layer is the surface of the transparent substrate opposite to the protective layer. The same procedure as in Example 9 was performed except that the two recording layers were provided so as to overlap each other.

As a result of observing this optical card under visible light from the protective layer side and the transparent substrate surface side so as to face the optical card, the number of the second recording layer could not be confirmed.
From the end of the optical card, a 5-digit number could be confirmed through the transparent adhesive layer and the transparent protective layer.

(Example 11) The two stripes of Example 9 were changed to a pattern of 2 mm x 5 mm square, and the concealing layer was placed inside the transparent protective substrate so as to overlap the second recording layer inside the magnetic tape. Except for the provision, it was manufactured in the same manner as in Example 9.

The result of observing this optical card under visible light from the protective layer side and the transparent substrate surface side so as to face the optical card, the pattern of the second recording layer could not be confirmed, but the optical card end From the part, the pattern could be confirmed through the transparent adhesive layer and the transparent protective layer.

(Example 12) (Preparation of magnetic tape having reflective layer and second recording layer) On the back surface of the same magnetic tape as used in Example 9, an aluminum reflective layer having a thickness of 1000 angstrom was formed by vacuum evaporation. Was set up. Then, bar code information was printed as a second recording layer by screen printing on the surface of the reflective layer at a position corresponding to the edge of the card, using the same two-component curable urethane acrylate ink as used in Example 9. . Next, an ethylene methacrylic acid-based hot melt adhesive (trade name: NUCREL) having a thickness of 5 μm so as to cover the second recording layer on the surface of the reflective layer.
An adhesive layer made of Mitsui DuPont Chemical Co., Ltd. was formed. The visible light transmittance of this adhesive layer was 95%.

An optical card was prepared in the same manner as in Example 9 except that this magnetic tape was used.

When the optical card thus obtained was observed under visible light, the barcode information could be visually recognized through the transparent substrate, the transparent adhesive layer and the transparent protective layer. On the other hand, when the optical card was observed from the substrate side and the protective layer side so as to face the optical card, the second recording layer 15 could not be visually recognized.

Example 13 An optical card having the structure shown in FIG. 2 was manufactured as follows.

(Preparation of transparent protective layer 7 having second recording layer 15 and second concealing layer 19) Length 100 mm, width 100
A transparent polycarbonate substrate having a thickness of 0.3 mm and a thickness of 0.3 mm was prepared. Example 1 is placed at a predetermined position on one surface of this substrate.
3 mm wide, 10 length long using blue ink
The white ink used in Example 1 so that the second protective layer 15 consisting of two stripes of 2 mm in size was formed by printing, and the entire surface of the second recording layer of the substrate was covered with the second recording layer 15. (Trade name: Sericol 13-611 White; (manufactured by Teikoku Ink Co., Ltd.)) and a second concealing layer 19 having a thickness of 20 microns and a transmittance for visible light of 2% or less.
Was formed.

(Preparation of Transparent Substrate 3 Comprising Surface Protective Layer 11, First Concealing Layer 17, and First Recording Layer 5) Length 100 m
A polycarbonate transparent substrate having m, a width of 100 mm, and a thickness of 0.4 mm and having a preformat for an optical card formed on one surface thereof was prepared. A urethane acrylate UV curable resin (trade name: Unidick; manufactured by Dainippon Ink and Chemicals, Inc.) was spin-coated to a thickness of 4 μm on the surface of the substrate on which the preformat was not formed, and the UV lamp ( It was cured using a power of 80 W / cm) to form a hard coat layer (surface protection layer 11). Furthermore, 3 wt% of 1,1,5,5-tetrakis (p-dimethylaminophenyl) -2,4-pentadienium perchlorate was added to the optical recording area on the surface of the substrate on which the preformat was formed. A diacetone alcohol solution was gravure coated and dried to form a first recording layer 5 having a thickness of 1000 angstrom.

(Production of Optical Card) Protective Layer 7 and Substrate 3
Were bonded in the same manner as in Example 1 so that the surface of the protective layer 7 on which the second recording layer 15 was not formed and the first recording layer 5 of the substrate 3 faced each other.

Next, a two-component curing type urethane acrylate ink having the following composition (trade name: HAC ink medium;
10 parts by weight of Seiko Advance Co., Ltd., a silver-colored pigment having an average particle diameter of 3 microns (trade name: Silver pigment 606)
A; Seiko Advance Co., Ltd.) 3 parts by weight, and H
AC ink curing agent (1 part by weight) is prepared, and is provided on the surface of the surface protection layer 11 of the work size optical card in which the substrate 3 and the protection layer 7 are bonded together, in the area where the second recording layer 15 is formed. Screen printing was performed on the corresponding region using a screen plate of mesh 225 to form a first hiding layer 17 having a thickness (20) μm. Then, an optical card was obtained by punching and cutting into a card size of 85.6 mm × 54 mm.

When the side surface of the thus obtained optical card where the end surface of the second recording layer is exposed is observed, the thickness is 0.
Blue stripes could be visually recognized through the 4 mm transparent substrate, the 60 μm thick transparent adhesive layer and the 0.3 mm thick transparent protective layer. On the other hand, when the optical card was observed from the substrate side and the protective layer side so as to face the optical card, the second recording layer could not be visually recognized.

[0142]

According to the embodiments of the present invention described above, (1) the card collation mark, management information such as the date of manufacture of the card, and various information such as ID information are provided on the inner surface of the card. Since it can be supported on the recording layer, it is difficult to forge and an information recording medium having excellent reliability can be obtained. (2) The second recording layer carrying various information is arranged adjacent to the transparent layer, and the information of the second recording layer is configured to be reproducible only from the side surface of the information recording medium. Visual information that is usually applied to the front and back of the medium (for example, a picture,
Further information can be added to the information recording medium without any restrictions on the formation or design of photographs, characters, numbers, etc.). (3) Since the second recording layer is sealed on the inner surface of the information recording medium, it is difficult for the medium to be read due to scratches or scratches on the edge of the medium, and information is overwritten on the edge in an attempt to counterfeit. However, the determination of authenticity is obvious, and even if the information in the second recording layer is forged, the laminated structure of the medium must be destroyed, which makes the forgery difficult. (4) By providing the reflective layer, the information in the second recording layer can be easily identified and the readable range can be provided with a depth, so that planar information such as character information can also be read from the end of the medium. It can be read and the amount of readable information can be increased. And so on.

[Brief description of drawings]

FIG. 1A is a schematic perspective view of an information recording medium according to an embodiment of the present invention. FIG. 1B is a schematic plan view of the information recording medium of FIG.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic cross-sectional view of an information recording medium according to another embodiment.

FIG. 4 is a schematic cross-sectional view of an information recording medium according to another embodiment.

FIG. 5A is a schematic sectional view of an information recording medium according to another embodiment. (B) A schematic sectional view of an information recording medium according to another embodiment. (C) A schematic cross-sectional view of an information recording medium according to another embodiment.

FIG. 6A is a schematic sectional view of an information recording medium according to another embodiment. (B) A schematic sectional view of an information recording medium according to another embodiment.

FIG. 7A is a schematic cross-sectional view of an information recording medium according to another embodiment. (B) A schematic sectional view of an information recording medium according to another embodiment. (C) A schematic cross-sectional view of an information recording medium according to another embodiment.

FIG. 8 is a schematic sectional view of an information recording medium provided with a reflective layer according to another embodiment.

FIG. 9 is a schematic sectional view of an information recording medium provided with a reflective layer according to another embodiment.

FIG. 10A is a schematic sectional view of an information recording medium provided with an opaque protective layer according to another embodiment. (B) It is a schematic sectional drawing of the information recording medium provided with the opaque protective layer concerning other embodiment.

FIG. 11 is a schematic cross-sectional view of an information recording medium provided with an opaque substrate according to another embodiment.

FIG. 12A is a schematic perspective view of an information recording medium according to still another embodiment. 12B is a sectional view taken along the line BB of FIG.

FIG. 13 is an explanatory diagram of the fifth embodiment.

FIG. 14 is an explanatory diagram of the sixth embodiment.

[Explanation of symbols]

 1 Optical Card 3 Substrate 5 Optical Recording Layer 7 Protective Layer 9 Adhesive Layer 11 Surface Protective Layer 13 Recording / Reproducing Light Beam 15 Second Recording Layer 17 First Hiding Layer 19 Second Hiding Layer 21 Reflective Layer 23 Opaque Protective Layer 25 Opaque substrate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G06K 19/10 G06K 19/00 R

Claims (35)

[Claims] 1. An information recording medium comprising a substrate, a first recording layer and a protective layer in this order, at least one of the substrate and the protective layer being an information recording medium transparent to light in a predetermined wavelength range, A transparent substrate or a transparent protective layer having a second recording layer arranged so that one surface thereof is in contact with the information, and the information carried on the second recording layer is exposed under light of the predetermined wavelength range. An information recording medium characterized in that it can be reproduced only from the side surface of the information recording medium. 2. The protective layer is bonded to the substrate by an adhesive layer which is transparent to light in the predetermined wavelength range.
Information recording medium. 3. The information recording medium according to claim 1, wherein both the substrate and the protective layer are transparent to light in the predetermined wavelength range. 4. The information recording medium according to claim 1, wherein the protective layer is opaque to light in the predetermined wavelength range. 5. The information recording medium according to claim 1, wherein the substrate is opaque to light in the predetermined wavelength range. 6. The information recording medium according to claim 1, wherein the second recording device is arranged between the substrate and the protective layer. 7. The information recording medium according to claim 3, which is dependent on claim 2, wherein the second recording layer is arranged between the protective layer and the adhesive layer. 8. The information recording medium according to claim 3, wherein the second recording layer is arranged between the substrate and the adhesive layer, and is dependent on claim 2. 9. The information recording medium according to claim 3, wherein the second recording layer is arranged on the surface of the substrate opposite to the side facing the protective layer. 10. The information recording medium according to claim 3, wherein the second recording layer is disposed on the surface of the protective layer opposite to the side facing the substrate. 11. A substrate between the substrate and the second recording layer, and at least one surface of the substrate opposite to a side facing the protective layer, and between the protective layer and the second recording layer. And first and second concealment that allows the second recording layer to be reproduced only from the side surface of the information recording medium at at least one of two positions on the surface of the protective layer opposite to the side facing the substrate. An information recording medium according to claim 6 when dependent on claim 3 having layers. 12. A first concealment layer is provided on a surface of the second recording layer opposite to the side facing the substrate, and a surface of the protective layer opposite to the side facing the substrate, and the first masking layer. 10. The information recording medium according to claim 9, when dependent on claim 3, having a second concealing layer at least at one location between the two recording layers and the protective layer. 13. A second concealment layer is provided on the surface of the substrate opposite to the side facing the protective layer, and at least at one location between the substrate and the second recording layer. The second concealing layer is provided on the surface of the layer opposite to the side facing the protective layer.
The information recording medium according to claim 10, when the information recording medium is dependent on. 14. The reflective layer according to claim 11, further comprising a reflective layer between at least one of the second recording layer and the first hiding layer and between the second recording layer and the second hiding layer. Any information recording medium. 15. A light-reflecting layer surface is provided on at least one of a surface of the first concealing layer facing the second recording layer and a surface of the second concealing layer facing the second recording layer. Claim 1
The information recording medium according to any one of 1 to 13. 16. The information recording medium according to claim 6, when dependent on claim 4, having a concealing layer on the surface of the substrate opposite to the side facing the protective layer. 17. A subordinate claim according to claim 4, wherein a concealing layer is provided on at least one of the surface of the substrate and the adhesive layer, and the surface of the substrate opposite to the side facing the protective layer. Item 7 The information recording medium. 18. When dependent on claim 4, wherein a concealing layer is provided between at least one of the surface of the substrate and the second recording layer, and on at least one surface of the substrate opposite to the side facing the protective layer. The information recording medium according to claim 8. 19. The information recording medium according to claim 6, when dependent on claim 5, having a concealing layer on the surface of the protective layer opposite to the side facing the substrate. 20. A subordinate to claim 5, wherein a concealing layer is provided between the protective layer and the second recording layer and on at least one surface of the protective layer opposite to the side facing the substrate. The information recording medium according to claim 7, 21. When dependent on claim 5, wherein a concealing layer is provided between the protective layer and the adhesive layer and on at least one surface of the protective layer opposite to the side facing the substrate. The information recording medium according to claim 8. 22. The information recording according to claim 16, further comprising a reflective layer between the concealing layer and the second recording layer and at least at one location between the second recording layer and the protective layer. Medium. 23. At least one of a surface of the concealing layer facing the second recording layer and a surface of the protective layer facing the second recording layer has a light reflecting surface. Information recording medium. 24. The information recording medium according to claim 19, further comprising a reflective layer between the concealing layer and the second recording layer and at least at one location between the second recording layer and the substrate. . 25. At least one of the surface of the concealing layer facing the second recording layer and the surface of the substrate facing the second recording layer has a light reflecting surface. Any information recording medium. 26. The information recording medium according to claim 1, wherein the information recording medium is an optical card. 27. The information recording medium according to claim 1, wherein the first recording layer is an optical recording layer. 28. The information recording medium according to claim 1, wherein the information carried by the second recording layer includes visible information. 29. The information recording medium according to claim 1, wherein the hiding layer includes a magnetic recording medium. 30. The information recording medium according to claim 1, wherein the light in the predetermined wavelength range is light in the visible range. 31. A method of manufacturing an information recording medium comprising a substrate, a first recording layer and a protective layer, wherein the substrate and the protective layer are transparent, wherein the second recording layer is on the transparent substrate or the transparent protective layer. Forming the second recording layer, the information carried on the second recording layer when the substrate and the protective layer are arranged so that the second recording layer is located between the substrate and the protective layer. A concealing layer that enables reproduction only from the side surface of the information recording medium, at least one of the surface between the substrate and the second recording layer, and the surface of the substrate opposite to the side facing the protective layer; Forming between the protective layer and the second recording layer, and on at least one of the surface of the protective layer facing the substrate and the surface opposite to the substrate;
And a step of joining the substrate and the protective layer so that the second recording layer is located therebetween, and a method for manufacturing an information recording medium. 32. A method of manufacturing an information recording medium comprising a substrate, a first recording layer and a protective layer, wherein the substrate or the protective layer is transparent, the step of forming the second recording layer on the transparent layer; The information carried on the second recording layer when the substrate and the protective layer are arranged such that the second recording layer is not located between the substrate and the protective layer is a side surface of the information recording medium. Forming a concealing layer that can be reproduced only on the surface of the second recording layer opposite to the surface facing the transparent layer; and between the substrate and the protective layer between the second recording layer. A method of manufacturing an information recording medium, the method including: joining so as not to be located in 33. The method of manufacturing an information recording medium according to claim 32, wherein a transparent substrate is used as the substrate, and the protective layer is opaque. 34. The method of manufacturing an information recording medium according to claim 32, wherein an opaque substrate is used as the substrate, and the protective layer is transparent. 35. The substrate and the protective layer are made transparent, and the second recording layer is formed on the surface of the substrate, and the second recording layer is formed.
33. The information recording medium according to claim 32, further comprising a step of providing a second concealing layer between the recording layer and the protective layer and on at least one of the surface of the protective layer opposite to the side facing the second recording layer. Production method.