JPH113412A - Data recording medium and imprinting body for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording medium which is difficult to be forged or duplicated and is also readable even by a conventional bar code reader. SOLUTION: A data recording medium 10 has a supporting body and an optical data recording layer 14 that is provided on it. The layer 14 has high reflectance areas 14H and low reflectance areas 14L which have mutually different reflectance to visible light due to optical interference effects. The areas 14H and 14L are arranged in the form of a bar code pattern, and the pattern corresponds to recorded data on the layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording medium in which a data recording layer on which data readable by an optical reader is recorded is formed on a support, and a transfer member used for manufacturing the data recording medium. .

[0002]

2. Description of the Related Art A data recording medium having a barcode pattern on which information readable by an optical machine is recorded is used in various fields. The principle of reading the code pattern utilizes the contrast between the black and white portions of the base pattern and the code pattern. For example, light from a light emitting diode or a semiconductor laser is applied to a barcode pattern,
Based on the difference in reflectance between the base and the barcode pattern,
The width of the pattern portion is detected, and the recording data is read based on this width. Generally, a black color such as carbon black is used for the code pattern from the viewpoint of quality and cost. As a special case, there is a blue or red color code pattern, but the reading principle is exactly the same as above.

However, when such a code pattern that can be clearly recognized by the naked eye is used, the code pattern may impair the aesthetic appearance depending on the type of the medium to which the code pattern is applied. Further, the barcode pattern can be easily copied or forged by a copying machine or the like.

In order to prevent such duplication and forgery. There is also a measure of attaching or bonding a special optical medium having a metallic luster to an article as a transfer foil or a seal. For example, credit cards include OVD (optical variab)
There is a method in which a transfer foil is adhered to a card by thermal transfer to form a hologram or a grating image on the card.

A hologram or a grating image has an optical interference function that causes a unique color shift (color change of a reflected color) according to a viewing angle, and thus, a visible color differs depending on a viewing position. If you check for that,
It is possible to determine whether or not it is genuine, and at the same time, it has a remarkable forgery prevention effect against forgery using a color copying machine or the like. As these holograms and grating images, those which not only exhibit a forgery prevention effect and decoration effect but also allow information to be read by a machine have been developed. These are called machine-readable holograms.

[0006]

However, the machine readable hologram requires a special optical reader, and there is a problem that a currently popular bar code reader cannot be used.

The present invention has been made in view of the above circumstances, and has as its object to provide a data recording medium which is difficult to forge or duplicate and which can be read by a conventional code pattern reader. And Further, a second object of the present invention is to provide a transfer member capable of easily manufacturing such a data recording medium.

[0008]

In order to solve the above-mentioned problems, a data recording medium according to the present invention comprises a support, and an optical data recording layer provided on the support. The recording layer has a plurality of regions having different reflectivities for light of a specific wavelength due to an optical interference effect, the regions are arranged in a code pattern, and the pattern formed by the regions is the optical data recording layer. It is characterized by being compatible with recording data.

Further, a data recording medium according to the present invention comprises a support, and an optical data recording layer provided on the support, wherein the optical data recording layer comprises a plurality of optical data recording layers arranged in a code pattern. Each of the regions is composed of at least one thin film and at least one of the regions is composed of a plurality of laminated thin films. By at least one being different, the regions have different reflectivities for light of a specific wavelength, and the pattern formed by the region corresponds to the recording data of the optical data recording layer. It may be a feature.

[0010] In the data recording medium according to the present invention,
A plurality of regions arranged in a code pattern have different reflectivities. Code pattern readers are usually
Since the data is read based on the difference in the partial reflectance of the code pattern, even in the data recording medium according to the present invention, if the difference between the reflectances of the above-mentioned areas is made larger than the sensitivity of the reader, the conventional technique is used. With a code pattern reader according to the same principle as before. Further, the optical data recording layer according to the present invention has a completely different aesthetic appearance from a normal code pattern such as a bar code, and if the presence or absence of the pattern is confirmed, it is easy to discriminate between a genuine product and a counterfeit product. Moreover, it cannot be manufactured by simple means such as a copying machine. Therefore, forgery and duplication can be prevented.

Further, the data recording medium according to the present invention is
On the surface of the optical data recording layer opposite to the support, an optical diffraction layer that exhibits a diffraction image different from the code pattern due to an optical interference effect may be provided. Since the diffraction image of the optical diffraction layer has different colors depending on the position to be observed,
It is possible to more reliably determine whether or not it is a genuine article, and at the same time, it has a remarkable forgery prevention effect against forgery using a color copying machine or the like. Furthermore, the optical data recording layer is superimposed by the optical diffraction layer, and the optical diffraction layer shows an optical diffraction image to an observer, so that the optical data recording layer becomes less aesthetically noticeable. Also, if an optical diffraction layer is formed on a conventional code pattern, a black-and-white pattern can be seen through the optical diffraction layer, which impairs aesthetics. Such a defect can be avoided.

Further, the transfer body for producing a data recording medium according to the present invention comprises a transfer support, a release layer provided on one surface side of the transfer support, and a release layer opposite to the transfer support side of the release layer. An optical data recording layer provided on the surface side, and an adhesive layer provided on the surface opposite to the transfer support side of the optical data recording layer and capable of adhering to a support serving as a transfer object. The optical data recording layer has a plurality of regions having different reflectivities for light of a specific wavelength due to an optical interference effect, the regions are arranged in a code pattern, the pattern formed by the region is It corresponds to the recording data of the optical data recording layer.

Further, the transfer body for producing a data recording medium according to the present invention comprises a transfer support, a release layer provided on one side of the transfer support, and a release layer opposite to the transfer support side of the release layer. An optical data recording layer provided on the surface side, and an adhesive layer provided on the surface opposite to the transfer support side of the optical data recording layer and capable of adhering to a support serving as a transfer object. Wherein the optical data recording layer has a plurality of regions arranged in a code pattern, each of the regions is composed of at least one thin film, and at least one of the regions is a laminated plural thin film. The thicknesses of the thin films in each of the regions, the number of layers, and at least one of the components are different, so that the regions have different reflectances with respect to light of a specific wavelength. Or characterized in that to the pattern corresponds to the recording data of the optical data recording layer.

In manufacturing a data recording medium, an optical data recording layer may be formed directly on a support to be transferred, but depending on the type of support to be transferred,
Such a forming step may not be suitable. In addition, it may be necessary to change the recording data in a transaction process of the support as the transfer object, so that it is sometimes convenient to be able to replace the optical data recording layer. In such a case, as described above, it is preferable that the image is transferred to a support serving as a transfer target using a transfer member.

In this transfer body for producing a data recording medium, between the optical data recording layer and the release layer,
An optical diffraction layer exhibiting a diffraction image different from the code pattern due to an optical interference effect may be provided. After transferring the transfer member to the transfer member, the optical diffraction layer is left overlying the optical data recording layer. Thus, it is possible to easily manufacture a data recording medium provided with the above-mentioned optical diffraction layer.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1. First Embodiment A. First Embodiment FIG. 1 shows a data recording medium 1 according to a first embodiment of the present invention.
Indicates 0. The data recording medium 10 includes a support 11 and
Optical data recording layer 14 formed on support 11
And On the optical data recording layer 14, a protective layer 12 is formed. An adhesive layer 15 is provided on the lower surface of the support 11. In the illustrated example, the thickness of the data recording medium 10 is exaggerated, but in actuality, the entire thickness of the data recording medium 10 is less than 100 μm.

The support 11 is selected from the group consisting of synthetic resins such as polyethylene terephthalate, polyvinyl chloride, polyester, polycarbonate, polyethyl methacrylate, and polystyrene; natural resins; paper; It consists of a composite of

The protective layer 12 is provided to protect the optical data recording layer 14, and is made of a transparent resin or an inorganic material. For example, the resin used as the material of the protective layer 12 is selected from thermoplastic acrylic resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer, cellulose resin, chlorinated polypropylene resin, or the like, or Mixtures of those selected from the above, or those obtained by adding oil silicon, fatty acid amide, and zinc stearate thereto, and the like can be given.

The adhesive layer 15 is a layer for adhering the data recording medium 10 to the article 16 and includes an adhesive component such as acrylic, butyl rubber, natural rubber, silicon, polyisobutyl, etc., an alkyl methacrylate, It is composed of an adhesive mixed with an aggregation component such as vinyl ester, acrylonitrile, styrene, and vinyl monomer. In addition, these components, unsaturated carboxylic acid, hydroxyl group-containing monomer, modifying components such as acrylonitrile and polymerization initiator,
Additives such as a plasticizer, a curing agent, an effect accelerator, and an antioxidant may be added as necessary. Optical data recording layer 14
The material of the adhesive layer 15 is not limited as long as the material does not deteriorate.

The optical data recording layer 14 reflects external light transmitted through the protective layer 12. As shown in FIGS. 2 and 3,
The optical data recording layer 14 includes a plurality of areas 14 having different reflectivities for light of a specific wavelength due to an optical interference effect.
H, 14L, and these areas 14H, 14L
Are arranged alternately. Specifically, the region 14H has a high reflectance with respect to visible light, the region 14L has a low reflectance, and the regions 14H and 14L are arranged in a barcode shape. The regions 14H and 14L are both a metal thin film layer 141, a ceramic thin film layer 142,
The multilayer optical film 3 is laminated, but the thickness and components of each layer are different between the high reflectance region 14H and the low reflectance region 14L. In FIG. 2, the subscripts H and L are used to distinguish between the high reflectance area 14H and the low reflectance area 14L.

As the metal used for the metal thin film layers 141 and 143, aluminum, iron, titanium, silver and the like can be used. The formation of the metal thin film layers 141 and 143 can be performed by a vacuum evaporation method, a sputtering method, or the like.
The specific forming method is determined according to the component material of each layer.

The ceramic used for the ceramic thin film layer 142 includes zinc sulfide, titanium dioxide, zirconium dioxide, indium oxide, tin oxide, tantalum oxide, and the like.
Cerium oxide, zinc oxide, magnesium fluoride, calcium fluoride, aluminum fluoride, cerium fluoride, silicon dioxide, aluminum oxide, magnesium oxide and the like can be used. The method for forming the ceramic thin film layer 142 is as follows.
There is no particular limitation as long as the thickness can be controlled, but the dry method is excellent. For example, a physical vapor deposition method such as a vacuum deposition method and a sputtering method, and a chemical vapor deposition method such as a CVD method are possible.

In order to form the regions 14H and 14L at positions adjacent to each other, before forming the high reflectance region 14H, a mask is applied to a position corresponding to the low reflectance region 14L, and layers are formed only at necessary portions. It is good to be formed. On the other hand, before forming the low reflectance area 14L, it is preferable to apply a mask to a position corresponding to the high reflectance area 14H.

FIG. 3 is a plan view of the data recording medium 10. In the optical data recording layer 14, a code pattern is formed using the difference in reflectance between the high reflectance area 14H and the low reflectance area 14L for visible light. That is, it corresponds to the data in which the pattern formed by the areas 14H and 14L is recorded. For example, area 14
Regardless of the level of the reflectance of H and 14L, if the width of the area is large, it indicates "1" in the binary system, and if the width of the area is small, it is "0".
Will be represented. In the optical data recording layer 14 of FIG. 3, data “0011010” is recorded from the left side.

By the way, a conventional bar code reader is:
Utilizing the contrast between the white bar and the black bar of the barcode pattern, the width of the pattern portion is detected based on the difference in the reflectance between the two, and the recording data is read based on this width. Since the regions 14H and 14L in this embodiment also have a difference in reflectance, if the difference in the reflectance is made larger than the sensitivity of the reader, it is possible to read the barcode reader using the same principle as the conventional barcode reader. It is possible.

That is, when the data recording medium 10 is moved to the left at a constant speed with respect to the stationary reader as shown by the arrow in FIG. 3, the reader reads "00111010" recorded here. Can be read. Alternatively, the same applies to a case where the reader scans rightward at a constant speed.

The optical data recording layer 14 can be made less noticeable in appearance than a conventional bar code pattern composed of white bars and black bars. Further, the optical data recording layer 14 has a completely different aesthetic appearance from a normal bar code, and if the presence or absence of the optical data recording layer 14 is confirmed, it is possible to easily discriminate between a genuine product and a counterfeit product. Moreover, since it cannot be manufactured by simple means such as a copying machine, it is possible to prevent forgery or duplication of the data recording medium 10.

As described above, this data recording medium 10
Is adhered to the article 16. That is, the data recording medium 10 is used as a data tag that can be attached, detached, or replaced. In other words, the article 16 is used as a data recording medium by attaching the data tag.

In manufacturing the data recording medium, the article 16 may be used as a support, and the optical data recording layer 14 may be formed directly on the article 16. However, article 1
Depending on the type of 6, the deposition of the optical data recording layer 14 such as evaporation or sputtering may not be suitable. Further, in the process of trading the article 16, it may be necessary to change the recording data, and it is sometimes convenient to be able to replace the optical data recording layer 14. In such a case, it is preferable that the data recording medium 10 be adhered to the article 16 using the adhesive layer 15 as described above.

B. Prototype Example A data recording medium 10 corresponding to the above embodiment was prototyped. The support 11 was a transparent polyethylene terephthalate film having a thickness of 50 μm. The protective layer 12 was formed by printing a composition having a compounding ratio shown in Table 1 by a gravure printing method. The drying temperature after printing was 110 ° C. The thickness of the protective layer 12 was 0.8 μm.

[Table 1]

The low reflectance area 1 of the optical data recording layer 14
4L has the configuration shown in Table 2.

[Table 2]

On the other hand, the high reflectance area 14H has the structure shown in Table 3. The second column in Tables 2 and 3 shows the material, and the third column shows the thickness.

[Table 3]

The adhesive layer 15 was formed by printing a composition having a compounding ratio shown in Table 4 by a gravure printing method. The drying temperature after printing was 110 ° C. The thickness of the adhesive layer 15 was 20 μm.

[Table 4] The arrangement of the regions 14H and 14L was the same as in FIG. That is, the data “0011010” was recorded on the optical data recording layer 14 from the left side. When the data recording medium 10 manufactured as described above was read by a normal bar code reader, the reading result was "0011010".

2. Second Embodiment In the above embodiment, the optical data recording layer 14
Has three layers in each of the regions 14H and 14L, but the number of layers is not limited to this. FIG.
1 shows an optical data recording layer 14 of a data recording medium 10 according to an embodiment. In this embodiment, the optical data recording layer 14 includes a metal thin film layer 141, a high refractive index ceramic thin film layer 142, a low refractive index ceramic thin film layer 144, and a metal thin film layer 143. In FIG. 4,
The suffixes H and L represent the high reflectance area 14H and the low reflectance area 1
The layer to which 4L belongs is distinguished.

Here, the low refractive index ceramic thin film layer 14 is used.
4 is different from the first embodiment in that
Other features are the same as in the first embodiment. The high-refractive-index ceramic thin film layer 142 is formed of a high-refractive-index ceramic such as zinc sulfide, titanium dioxide, zirconium dioxide, indium oxide, tin oxide, tantalum oxide, cerium oxide, and zinc oxide. This is the same as the embodiment. The low refractive index ceramic thin film layer 144 is formed of a material having a lower refractive index than the high refractive index ceramic thin film layer 142. For example, as this material, magnesium fluoride, calcium fluoride, aluminum fluoride,
Cerium fluoride, silicon dioxide, aluminum oxide, magnesium oxide and the like can be used. The method of forming the low refractive index ceramic thin film layer 144 may be the same as the method of forming the high refractive index ceramic thin film layer 142.

Also in this embodiment, the regions 14H, 1
The reflectance for 4L visible light can be made different, so that the data recording medium 10 can be used in the same manner as described above. If the reflectances of the regions 14H and 14L can be made different, the number of layers constituting the optical data recording layer 14 is not limited to the first embodiment and the second embodiment, but may be more multilayered. It is also possible. Further, the number of layers in the region 14H and the region 14L
And the number of layers may be different.

3. Third Embodiment A. Configuration and Method of Use FIG. 5 shows a transfer body 20 used for manufacturing a data recording medium according to the third embodiment of the present invention, and FIG. 6 shows a manufactured data recording medium 30. As shown in FIG. 5, the transfer body 20 includes a transfer support 21, a release layer 22 formed on the lower surface thereof, and an optical diffraction layer (OVD) formed on the lower surface thereof.
Layer: an optical variable device layer 23, an optical data recording layer 24 formed on the lower surface thereof, and an adhesive layer 25 formed on the lower surface thereof. Further, the transfer support 2
The back coat layer 26 is formed on the upper surface of the substrate 1. Although the thickness of the transfer body 20 is exaggerated in the illustrated example,
Actually, the entire thickness of the transfer body 20 is less than 100 μm.

As shown in FIG. 5, the adhesive layer 25 is
The transfer body 20 is placed on the article 36 so that the transfer body 20 is brought into contact with the article 36. When the transfer body 20 is pressed and heated by the thermal head 40 from above, the transfer body 20 is adhered to the article 36 by the adhesive layer 25. Thereafter, the release layer 22 is separated from the optical diffraction layer 23, so that the optical diffraction layer 23 and the optical data recording layer 24 are left on the article 36. Thus, the optical diffraction layer 23 and the optical data recording layer 24
The data recording medium 30 having the structure in which the is adhered to the article 36 is manufactured.

The transfer support 21 is selected from synthetic resins such as polyethylene terephthalate, polyvinyl chloride, polyester, polycarbonate, polyethyl methacrylate, and polystyrene; natural resins; paper; synthetic paper; Consists of a complex of selected ones.

The release layer 22 is provided for effectively transferring the optical diffraction layer 23 and the like to the article 36 as a transfer object, and is made of a resin containing an acrylic resin, toluene, or the like. In addition, thermoplastic acrylic resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, cellulosic resin, chlorinated polypropylene resin or those containing oil silicone, fatty acid amide, and zinc stearate added to them can be used. is there. Further, an inorganic substance may be added.

In the optical diffraction layer 23, a relief hologram, a pixelgram or a grating image is formed on the surface opposite to the release layer 22, that is, on the surface facing the optical data recording layer 24. This relief-shaped hologram, pixelgram or grating image is formed by forming a fine uneven pattern on the surface, and has an optical interference function that causes a unique color shift (color change of the reflected color) according to the viewing angle. Thus, the color that can be seen differs depending on the observation position, and the observer can see the stripe pattern or other images. This concavo-convex pattern can be formed by, for example, a nickel press plate.

The optical diffraction layer 23 has good embossing formability, hardly generates defects during pressing, provides a bright diffraction image, has good adhesion to the optical data recording layer 24, and has good adhesion to the release layer 22. Is made of a material having good temporary adhesiveness and releasability. Examples of such a material include a mixture of a vinyl chloride-vinyl acetate copolymer resin and methyl ethyl ketone. Also, polycarbonate resin, polystyrene resin,
Thermoplastic resin such as polyvinyl chloride resin, unsaturated polyester resin, melamine resin, epoxy resin, heat-effective resin such as urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, triazine (meth) acrylate Or a mixture thereof, or a thermoformable material having a radically polymerizable unsaturated group. In addition to these, a material having stability capable of forming an optical diffraction structure can be used.

In the data recording medium 30, since the optical diffraction layer 23 is coated on the optical data recording layer 24, the optical data recording layer 24 is hardly visible to the naked eye. For this purpose, the optical diffraction layer 23
Preferably covers the entire optical data recording layer 24.

The adhesive layer 25 is a layer for adhering the data recording medium 30 to the article 36, and includes an adhesive component such as acrylic, butyl rubber, natural rubber, silicon, polyisobutyl, etc., an alkyl methacrylate, It is composed of an adhesive mixed with an aggregation component such as vinyl ester, acrylonitrile, styrene, and vinyl monomer. In addition, these components, unsaturated carboxylic acid, hydroxyl group-containing monomer, modifying components such as acrylonitrile and polymerization initiator,
Additives such as a plasticizer, a curing agent, an effect accelerator, and an antioxidant may be added as necessary. Optical data recording layer 24
The material of the adhesive layer 25 is not limited as long as the material does not deteriorate.

The optical data recording layer 24 is the optical diffraction layer 2
3 reflects external light passing through. As shown in FIGS. 7 and 8, the optical data recording layer 24 has a plurality of regions 24H and 24L having different reflectivities for light of a specific wavelength due to an optical interference effect.
24L are alternately arranged. Specifically, with respect to visible light, the region 24H has a high reflectance, the region 24L has a low reflectance, and the regions 24H and 24L are arranged in a barcode shape. The region 24H includes the metal thin film layer 24
1, a multilayer optical film in which a ceramic thin film layer 242 and a metal thin film layer 243 are laminated.
41 is a multilayer optical film in which a metal thin film 41 and a metal thin film layer 243 are laminated. In FIG. 7, the subscripts H and L indicate the high reflectance regions 24.
H and the low reflectance region 24L are distinguished to which layer the layer belongs. The materials and forming methods of the metal thin film layers 241 and 243 and the ceramic thin film layer 242 are the same as in the first embodiment.

The back coat layer 26 formed on the transfer support 21 transfers the transfer medium 20 to the data recording medium 30.
When manufacturing the transfer support 21,
Prevent from sticking to. For this reason, the back coat layer 2
6 is formed, for example, by mixing a slip agent with a resin serving as a binder or the like. As the binder, for example, a thermoplastic acrylic resin, a cellulose resin, a polyester resin, a thermosetting resin such as an acrylic polyol or a polyester polyol, a silicone EB-curable resin, or the like can be used. As the slip agent, various surfactants, polyethylene wax, silicone wax, silicone wax and the like can be used, and a filler such as talc can be added as needed.

FIG. 8 is a plan view of the data recording medium 30. In the optical data recording layer 24, a code pattern is formed utilizing the difference in reflectance between the high reflectance region 24H and the low reflectance region 24L for visible light. That is, it corresponds to the data in which the pattern formed by the areas 24H and 24L is recorded. Also in this embodiment,
As in the first embodiment, regardless of the reflectivity of the regions 24H and 24L, if the width of the region is large, it represents "1" in the binary system, and if the width of the region is small, it represents "0". I do. Like the optical data recording layer 14 in FIG. 3, the data “0011010” is recorded from the left side in the optical data recording layer 24 in FIG. Region 24 in this embodiment
Since H and 24L also have a difference in the reflectance, if the difference in the reflectance is made larger than the sensitivity of the reader, it is possible to read with a conventional bar code reader according to the same principle as the conventional one.

As shown in FIG. 8, a register mark 37 is provided on the article 36. The register mark 37 is a thin film on which a relief-type grating image is formed, which can be manufactured by the same process using the same material as the optical diffraction layer 23 described above. Register mark 37
Is bonded to the article 36 by, for example, an adhesive. The reader sequentially reads the register mark 37 and refers to the reading position of the register mark 37 to read the areas 24H, 2H.
The width of each of 4L is calculated. Thereby, the scanning speed of the reader or the data recording medium 3 for the reader is
Even if the transport speed of 0 fluctuates, the respective widths of the regions 24H and 24L, that is, the data recorded on the optical data recording layer 24 can be accurately read.

If the reflectivities of the regions 24H and 24L can be made different, the optical data recording layer 2
The number of layers constituting 4 is not limited to this embodiment, and it is possible to have more layers. Further, the region 24H
May be the same as the number of layers in the region 24L. Further, the thickness and components of each layer may be different between the high reflectance region 24H and the low reflectance region 24L.

The optical data recording layer 24 can be made less noticeable in appearance than a conventional bar code pattern composed of a white bar and a black bar. Further, the optical data recording layer 24 is covered with an optical diffraction layer 23, and the optical diffraction layer 23 shows an optical diffraction image to an observer. Therefore, as shown in FIG. Layer 24 is further aesthetically less noticeable.

If the optical diffraction layer 23 is formed on a conventional bar code pattern, the optical diffraction layer 2
The black-and-white pattern can be seen through 3 to impair the appearance, but the optical data recording layer 24 of the present embodiment can avoid such problems.

The optical data recording layer 24 has a completely different aesthetic appearance from a normal bar code. By confirming the presence or absence of the optical data recording layer 24, it is possible to determine whether the optical data recording layer is genuine or not. Since the data recording medium 30 cannot be manufactured by any means, forgery or duplication of the data recording medium 30 can be prevented. In addition, holograms, diffraction images such as pixelgrams and grating images also have different colors depending on the observation position, so if you check the presence or absence, it is even more reliable to determine whether they are genuine. At the same time, it has a remarkable forgery prevention effect against forgery using a color copying machine or the like. The diffraction image is recorded on the optical data recording layer 24.
It is necessary not to disturb the reading of the pattern, but the type of the pattern is not limited as long as this condition is satisfied.

When manufacturing the data recording medium 30, the article 36 may be used as a support, and the optical data recording layer 24 and the optical diffraction layer 23 may be directly laminated on the article 36. However, depending on the type of the article 36, the formation of the optical data recording layer 24 by deposition or sputtering may not be suitable. Further, in the process of trading the article 36, it may be necessary to change the recording data, and it may be convenient to be able to replace the optical data recording layer 24. In such a case, as described above, the transfer body 20
It is preferable that the image data is transferred to the article 36 by using.

B. Prototype Example The transfer body 20 corresponding to the above-described embodiment was formed, and the data recording medium 30 was prototyped. The transfer support 21 has a thickness of 12 μm.
m of a transparent polyethylene terephthalate film. The release layer 22 was formed by printing a composition having a compounding ratio shown in Table 5 by a gravure printing method. Drying temperature after printing is 11
It was brought to 0 ° C. The thickness of the release layer 22 was 0.8 μm.

[Table 5]

The optical diffraction layer 23 was formed by printing a composition having a compounding ratio shown in Table 6 by a gravure printing method. The drying temperature after printing was 110 ° C. The thickness of the release layer 22 is 0.5
μm. The diffraction image of the optical diffraction layer 23 was formed by press molding at a plate surface temperature of 165 ° C. with a nickel press plate. The diffraction image was a grating image using two-beam interference.

[Table 6]

The low reflectance area 2 of the optical data recording layer 24
4L has the configuration shown in Table 7.

[Table 7]

On the other hand, the high reflectivity region 24H has the structure shown in Table 8. The second column in Tables 7 and 8 shows the material, and the third column shows the thickness.

[Table 8]

The arrangement of the regions 24H and 24L was the same as in FIG. That is, the data “0011010” was recorded on the optical data recording layer 24 from the left side.

The adhesive layer 25 was formed by printing a composition having a compounding ratio shown in Table 9 by a gravure printing method. The drying temperature after printing was 110 ° C. The thickness of the adhesive layer 25 was 1.0 μm.

[Table 9]

The back coat layer 26 was formed by printing a composition having a compounding ratio shown in Table 10 by a gravure printing method. The drying temperature after printing was 110 ° C. The thickness of the back coat layer 26 was 1.0 μm.

[Table 10]

Thus, a transfer member 20 was formed. Thereafter, the transfer body 20 was transferred to the article 36 using the known thermal head 40, and the data recording medium 30 was manufactured. The article 36 to be transferred was a white vinyl chloride card.

When the data recording medium 30 was read by a normal bar code reader, the read result was “0011”.
010 ". In addition, the appearance of the portion where the optical diffraction layer 23 and the optical data recording layer 24 overlapped each other had the same decorative function as the diffraction grating image because of the optical diffraction layer 23.

4. Other Modifications In the above-described embodiment, a code system in which the width of each area of the optical data recording layers 14 and 24 is set to two types is adopted, but other code systems used in the current barcode are used. It is also possible to employ.

In the above embodiment, the optical data recording layers 14 and 24 have regions having different reflectances for visible light, but regions having different reflectances for infrared wavelengths may be formed.

In the above embodiment, the code pattern of the optical data recording layers 14 and 24 is a bar code pattern in which rectangular bars are arranged in a line.
Other code patterns in which a plurality of geometric patterns such as circles and ellipses are arranged may be used. For example, a carla code pattern or a vericode pattern can be used. Further, the geometric pattern regions may be arranged in a plurality of rows.

[0066]

As described above, according to the present invention,
Forgery and duplication of the data recording medium are made difficult, and the data recorded on the data recording medium can be read even by a conventional code pattern reader. Further, according to the transfer body of the present invention, it is possible to easily manufacture such a data recording medium.

[Brief description of the drawings]

FIG. 1 is a side view showing a data recording medium according to a first embodiment of the present invention.

FIG. 2 is an enlarged side sectional view showing in detail a laminated state of optical data recording layers of the data recording medium shown in FIG.

FIG. 3 is a plan view showing the data recording medium shown in FIG.

FIG. 4 is a cross-sectional view illustrating a stacked state of optical data recording layers of a data recording medium according to a second embodiment of the present invention.

FIG. 5 is a side view showing a transfer body used for manufacturing a data recording medium according to a third embodiment of the present invention.

6 is a side view showing a data recording medium manufactured using the transfer body shown in FIG.

FIG. 7 is an enlarged side sectional view showing in detail a laminated state of optical data recording layers of the data recording medium shown in FIG.

8 is a plan view showing the data recording medium shown in FIG.

FIG. 9 is an enlarged view of a portion IV in FIG. 8;

[Explanation of symbols]

10 data recording medium, 11 support, 12 protective layer,
14 ... optical data recording layer, 14H ... high reflectance area, 1
4L: low reflectance region, 141H, 141L: metal thin film layer, 142H, 142L: ceramic thin film layer, 143
H, 143L: metal thin film layer, 144H, 144L: low refractive index ceramic thin film layer, 15: adhesive layer, 16: article (support), 20: transfer body, 21: transfer support, 22: release layer, 23 ... Optical diffraction layer, 24 ... optical data recording layer,
24H: High reflection area, 24L: Low reflection area, 241H,
241L: metal thin film layer, 242H: ceramic thin film layer,
243H, 243L: metal thin film layer, 25: adhesive layer, 26
... back coat layer, 30 ... data recording medium, 36 ... article (transferred object, support), 37 ... register mark, 40
… Thermal head

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G06K 19/06 G03G 21/00 550 // G11B 7/24 522 G06K 19/00 D

Claims (6)

[Claims] An optical data recording layer provided on a support, wherein the plurality of optical data recording layers have different reflectivities for light of a specific wavelength due to an optical interference effect. A data recording medium having a region, wherein the region is arranged in a code pattern, and a pattern formed by the region corresponds to recording data of the optical data recording layer. 2. An optical data recording layer comprising: a support; and an optical data recording layer provided on the support, wherein the optical data recording layer has a plurality of regions arranged in a code pattern. The region is formed of at least one thin film and at least one of the regions is formed of a plurality of stacked thin films, and the thickness of each thin film in the region, the number of stacked layers and at least one of the components are different from each other, A data recording medium, wherein the regions have different reflectivities for light of a specific wavelength, and a pattern formed by the regions corresponds to recording data of the optical data recording layer. 3. The optical data recording layer is provided with an optical diffraction layer presenting a diffraction image different from the code pattern due to an optical interference effect on a surface side opposite to the support. 3. The data recording medium according to claim 1, wherein: 4. A transfer support, a release layer provided on one surface side of the transfer support, and an optical data recording layer provided on a surface side of the release layer opposite to the transfer support side. An optical data recording layer, provided on a surface side opposite to the transfer support side, and an adhesive layer capable of adhering to a support serving as a transfer object; and It has a plurality of regions having different reflectances for light of a specific wavelength due to the effect, the regions are arranged in a code pattern, and the pattern formed by the regions corresponds to the recording data of the optical data recording layer. A transfer member for manufacturing a data recording medium. 5. A transfer support, a release layer provided on one surface side of the transfer support, an optical data recording layer provided on a surface side of the release layer opposite to the transfer support side, The optical data recording layer is provided on the surface side opposite to the transfer support side and includes an adhesive layer that can be adhered to a support serving as a transfer object, and the optical data recording layer has a code pattern shape. Has a plurality of regions arranged in each of the above, each of the regions is formed of at least one thin film and at least one of the regions is formed of a plurality of stacked thin films, the thickness of the thin film of each of the regions, Due to at least one of the number of layers and the component being different, the regions have different reflectivities for light of a specific wavelength, and the pattern formed by the regions is different from the recording data of the optical data recording layer. Data recording medium-producing transcripts characterized in that it corresponds to the data. 6. An optical diffraction layer, which exhibits a diffraction image different from the code pattern due to an optical interference effect, is provided between the optical data recording layer and the release layer. Item 6. The transfer body for manufacturing a data recording medium according to Item 4 or 5.