JPH07186577A - Information recording medium and transfer sheet - Google Patents

Abstract

PURPOSE:To provide an information recording medium and a transfer sheet in which new information can be written without impairing a decoration effect peculiar for a hologram, forgery preventing effect and falsification preventing effect. CONSTITUTION:An information recording medium 20 has a thermal recording layer 2, a photothermal conversion layer 3, a hologram forming layer 4, a transparent thin film layer 5, an adhesive layer 6, and a protective layer 7. The layer 2 is provided on a base material 1. The layer 3 is provided on the layer 2, and the layer 4 is provided on the layer 3. The layer 5 is provided on the layer 4, and the layer 6 is provided on the layer 5. The layer 7 is provided on the layer 6. Since the medium 20 is formed with a hologram, it has a decoration effect, and scarcely forged or falsified. When a laser beam, etc., is emitted to the layer 3, the layer 4 is heated. As a result, information is recorded on the layer 4.

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 adhered to, for example, a credit card, and a transfer sheet used for manufacturing the information recording medium, which is provided with a hologram image effective for preventing forgery and alteration. Information can be newly recorded by irradiating a high-energy light beam such as a laser beam.

[0002]

2. Description of the Related Art Conventionally, various holograms are known.
It has an excellent three-dimensional appearance as a three-dimensional display. This hologram was used to decorate the surface of various articles (base materials).

In recent years, in addition to the above-mentioned three-dimensional appearance, the hologram has been examined for use as an information recording medium, and various holograms have been proposed. This is because it is difficult to forge or alter the hologram.

As an example of this hologram, a single light reproduction type hologram is known. An information pattern is formed on the single light reproduction hologram. Then, the information pattern is irradiated with laser light in the visible wavelength region. As a result, the information pattern is imaged and reproduced on the image plane such as frosted glass.

As another example of use as an information recording medium, a machine-readable hologram is known. In this machine-readable hologram, a relatively simple identification mark such as a bar code or a Carla code is formed as the information pattern. The reproduced information pattern is mechanically read by using an optical sensor or the like.

Further, recently, an attempt has been made to enable visual confirmation of an information pattern by attaching a transparent hologram to an image display portion such as a credit card or an ID card.

[0007]

However, while such a conventional hologram is difficult to forge or alter, it is impossible to newly write information after forming an information pattern.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording medium in which new information can be written without impairing the decorative effect, the forgery preventing effect and the alteration preventing effect peculiar to the hologram, and an information recording medium of this information recording medium. It is to provide a transfer sheet used for manufacturing.

[0009]

The invention according to claim 1 provides at least a heat-sensitive recording layer on a substrate, a light-heat converting layer provided on the heat-sensitive recording layer, and a light-heat converting layer provided on the light-sensitive recording layer. The information recording medium includes a transparent thin film layer and a hologram layer including a hologram forming layer on which a hologram image is formed.

The invention according to claim 2 is characterized by comprising a peeling layer releasably provided on a support, and a transparent thin film layer and a hologram forming layer provided with a hologram image on the peeling layer. A transfer sheet including a hologram layer, a photothermal conversion layer provided on the hologram layer, a thermosensitive recording layer provided on the photothermal conversion layer, and an adhesive layer provided on the thermosensitive recording layer. is there.

[0011]

In the information recording medium according to the first aspect of the present invention, since the hologram is formed, it has a decorative effect and is hard to be forged or altered. When the light-heat conversion layer is irradiated with light such as a laser beam, the light-heat conversion layer generates heat and heats the heat-sensitive recording layer. As a result, information is recorded on the thermosensitive recording layer. Therefore, this information recording medium can record new information without impairing the decorative effect, the forgery prevention effect, and the alteration prevention effect peculiar to the hologram.

The information recording medium 20 will be described with reference to FIGS. This information recording medium 20 is provided on a base material 1, and has a thermosensitive recording layer 2, a photothermal conversion layer 3, and a hologram forming layer 4.
The transparent thin film layer 5, the adhesive layer 6, and the protective layer 7 are sequentially laminated (see FIG. 1).

The material of the base material 1 is paper, glass,
Plastic, metal or wood can be used. It is preferable that these materials are appropriately selected depending on the strength, flexibility, weight, adhesiveness, processability, etc. required of the substrate 1 provided with the information recording medium 20. Further, the thickness of the base material 1 can be freely set, and it is desirable to change it as necessary.

As the heat-sensitive recording layer 2, the self-coloring layer 8 of FIG. 2 or the concealing layer 9 and the coloring layer 10 of FIG.
Can be considered. Although the two examples of FIG. 2 or FIG. 3 are given as the thermal recording layer 2, the present invention is not limited to these.

More specifically, the self-color-changing layer 8 shown in FIG. 2 is formed mainly of a color-changing substance. This color-changing substance, when heated, causes a chemical change and develops or disappears color. That is, in the self-color-changing layer 8, only the heated portion changes color. Therefore, when a part of the self-color changing layer 8 is heated, a part that does not change color and a part that changes color are formed in the self-color changing layer 8. The color of the discolored portion can be used as a color for displaying the recorded information. The discolorable substance includes organic substances and inorganic substances. Examples of the organic discoloring substance include a combination of a leuco dye and a developer, a combination of a diazonium salt and a coupler, and the like. Further, examples of the inorganic discoloring substance include molybdic acid compounds, amorphous silicon hydride, iron oxide and iron hydroxide.

The method for forming the self-color changing layer 8 is appropriately selected from a coating method and a printing method. Substrate 1
It is provided thereon with a thickness of 0.1 to 50 μm, preferably 3 to 10 μm. Examples of the coating method include gravure coating, knife coating, and roll coating.
The printing method includes offset printing, gravure printing, screen printing and the like.

On the other hand, the thermosensitive recording layer 2 shown in FIG. 3 is composed of a colored layer 10 colored in a color for displaying recorded information and a concealing layer 9 covering the colored layer 10. This hiding layer 9
Is for hiding the color of the colored layer 10. And the hiding layer 9
When a part of is heated, that part is dissolved and removed. As a result, a part of the colored layer 10 is exposed. Therefore, in the heat-sensitive recording layer 2, a color portion of the hiding layer 9 and a color portion of the coloring layer 10 are formed. Therefore, information is recorded on the thermosensitive recording layer 2. Examples of the material of the concealing layer 9 include low melting point metal thin films such as tin. As a material for the colored layer 10, an ink having a desired hue (a color for displaying recorded information) is suitable.

The method for forming the coloring layer 10 is appropriately selected from the same methods as the method for forming the self-color-changing layer 8 having a thickness of 0.5 to 50 μm, preferably 1 to 5 μm on the substrate 1. It is desirable to use the selected method. Further, the concealing layer 9 is formed on the colored layer 10 by using a vapor phase coating method such as a vacuum vapor deposition method or a sputtering method, and is 500 to 5
It is desirable to form it to a thickness of 000 nm.

The photothermal conversion layer 3 contains a light absorbing substance. The light absorbing substance may be any substance that absorbs light in the wavelength band irradiated when information is recorded on the thermosensitive recording layer 2 and converts it into heat energy. For example, when a semiconductor laser having a wavelength of 780 nm is used as the light source, a light absorbing substance that absorbs light in this wavelength band can be used. Examples of this light absorbing substance include organic dye-based cyanine dyes, phthalocyanine dyes, pyrylium dyes, squarylium dyes, and aluminum dyes.

In the method of forming the photothermal conversion layer 3, first,
The light absorbing substance is dispersed in a polymer resin. As the polymer resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin, polyurethane resin, acrylic resin or the like is suitable. Next, the dispersion on the thermosensitive recording layer 2 is appropriately selected from the same method as the method for forming the self-color-changing layer 8 and is 0.1 to 10 μm, preferably 1 to 3 μm.
It has a thickness of m. The light-heat conversion layer 3 may be formed on the heat-sensitive recording layer 2 by using a vapor-phase coating method such as a vapor deposition method or a sputtering method.

The hologram forming layer 4 has a transparent resin portion and a hologram forming portion in which one surface of the transparent resin portion is heated and pressed to form an uneven surface with a stamper. When a two-component reactive urethane resin is used as the material of this transparent resin portion, extremely good results are obtained. This is because the two-component reactive urethane resin has good embossing moldability, is less likely to cause press spots, produces a bright reproduced image, and has good adhesiveness with the reflective layer (transparent thin film layer 5). .

As the two-component reactive urethane resin, a polyol-curable urethane resin is suitable in view of various physical properties such as solvent resistance, heat resistance and processability. This polyol-curable urethane resin is composed of a prepolymer having a polyol component and an isocyanate component. As the above-mentioned polyol component, polyether polyol, polyester polyol, acrylic polyol or the like is suitable. Further, as the above-mentioned isocyanate component, toluene diisocyanate (TDI), xylene diisocyanate (XDI) or hexamethylene isocyanate (H
MDI) etc. can be applied.

When an acrylic polyol as a polyol component having a glass transition point in the range of 70 to 150 ° C. and an OH group number in the range of 50 to 150 is used, the coating suitability is improved. It becomes good, and the embossing moldability required for the hologram forming layer 4 becomes extremely good.

In addition, the cellulose-based resin modifier is used as described in 2 above.
When 30% by weight is added to the liquid-reactive urethane resin at the maximum, the coating suitability of the hologram forming layer 4 is improved. Suitable cellulose resins include nitrocellulose, acetyl cellulose, cellulose acetate butyrate, cellulose acetate propionate, ethyl cellulose and methyl cellulose.

As a method of applying the hologram forming layer 4, it is suitable to form the resin by coating it by a method such as roll coating or blade coating and then drying it. At this time, the thickness of the hologram forming layer 4 is
About 0.5 to 5 μm is desirable.

The hologram forming layer 4 is formed into an excellent uneven surface by heating and pressing during embossing. Further, the hologram layer 4 does not exhibit adhesiveness to the surface relief hologram stamper or the hologram stamper, and exhibits good adhesiveness to the transparent thin film layer 5. The surface of the surface relief hologram stamper is plated with nickel, gold, chrome or the like.

Next, as a material for forming the transparent thin film layer 5, a material having a higher refractive index than the hologram forming layer 4 and a high transmittance in the visible light region is suitable. The transparent thin film layer 5 is formed according to the uneven surface (hologram forming portion) of the hologram forming layer 4. Therefore, the transparent thin film layer 5 has the angle dependence of reproduction which is a characteristic of the hologram. As a result, when light is incident on the transparent thin film layer 5 within a reproducible angle range of the hologram image, the transparent thin film layer 5 has a maximum light reflectance. Therefore, the transparent thin film layer 5
Causes the hologram forming layer 4 to function as a “reflection hologram”. On the other hand, when light is incident on the transparent thin film layer 5 at an angle exceeding the reproducible angle range of the hologram image, the transparent thin film layer 5 functions simply as a transparent body. In this case, it is possible to print on the thermosensitive recording layer 2 using a laser. Further, the printed information pattern can be visually checked. Table 1 shows examples of the material of the transparent thin film layer 5.
There are inorganic materials described in.

[0028]

[Table 1]

As a method of forming the transparent thin film layer 5, a film forming means such as a vacuum vapor deposition method, a sputtering method or an ion plating method can be applied. The thickness of the transparent thin film layer 5 is preferably in the range of 10 to 1000 nm.

The adhesive layer 6 enhances the adhesion strength between the transparent thin film layer 5 and the protective layer 7. Thermoflexible resin is used for the adhesive layer 6. Examples of the thermo-flexible resin include polyester such as linear saturated polyester, vinyl chloride resin such as polyvinyl chloride-vinyl acetate copolymer resin, acrylic resin, or vinyl resin. Examples of the acrylic resin include polyacrylic acid, 2-methoxyethyl polyacrylate, polymethyl acrylate, 2-naphthyl polyacrylate, isobornyl polyacrylate, polymethacrylomethyl, polyethyl methacrylate, polymethacrylic acid. -T-butyl, polyisobutyl methacrylate, polyphenyl methacrylate,
Alternatively, a copolymer resin of methyl methacrylate and alkyl methacrylate (provided that the alkyl group has 2 to 6 carbon atoms) is suitable. Suitable vinyl resins include polystyrene, polyvinylbenzene, or styrene-butadiene copolymer resin styrene and alkyl methacrylate (provided that the alkyl group has 1 to 6 carbon atoms).

The method for applying the adhesive layer 6 is as follows. First, the composition containing the above-mentioned flexible resin is made into a coating material with a suitable solvent, and the coating material is applied by gravure coating, roll coating or bar code coating. It can be applied and dried.

The protective layer 7 prevents the transparent thin film layer 5, the hologram forming layer 4, the photothermal conversion layer 3 and the heat-sensitive recording layer 2 from chemical damage or mechanical damage. Further, it is preferable that the protective layer 7 is made of a material that transmits the light emitted when the information is recorded on the thermosensitive recording layer 2. In addition, the protective layer 7
Is preferably a material having a transmittance as high as possible in the wavelength range of light. Further, the material of the protective layer 7 has a required strength,
It is selected by flexibility, adhesiveness, processability, or the like. For example, a sheet (film) made of vinyl chloride resin or polyethylene terephthalate resin can be used. The thickness of the protective layer 7 is selected depending on the purpose, but it is desirable that it is as thick as possible from the viewpoint of preventing falsification of recorded information on the thermal recording layer 2. Also,
The thickness of the protective layer 7 is 5 μm or more, preferably 20 μm.
With the above, it is possible to prevent falsification of the thermal recording layer 2 by a heat source such as a thermal head.

The transfer sheet according to the second aspect of the invention can be used when the information recording medium according to the first aspect is manufactured on a substrate. That is, the adhesive layer of the transfer sheet is adhered to the base material. Further, the support material is peeled off from the peeling layer. As a result, the information recording medium according to claim 1 can be manufactured on the base material.

As an example of this transfer sheet, the thermal transfer sheet 21 shown in FIG. 4 will be described. This thermal transfer sheet 21
Is manufactured by sequentially laminating the peelable protective layer 12, the hologram forming layer 4, the transparent thin film layer 5, the photothermal conversion layer 3, the heat-sensitive recording layer 2, and the heat-sensitive adhesive layer 13 on the support film 11. Then, the thermal transfer sheet 21 is adhered to the entire one surface or a part of the one surface of the various types of the base material 1 which is the transfer target by thermocompression. Further, the support film 11 is peeled off from the peelable protective layer 12. As a result, as shown in FIG. 5, the information recording portion 22 can be easily formed on the base material 1.

The thermal transfer sheet 21 is required to have the following special properties because the support film 11 has to be peeled off after adhering to the substrate 1.

First, the support film 11 must have heat resistance when the thermal transfer sheet 21 is thermally transferred to the substrate 1. This heat resistance is not softened by the heat and pressure at the time of thermal transfer,
Alternatively, it has a property of not deforming. In addition, the heat-sensitive adhesive layer 13
Is desired to have a property of easily adhering to the base material 1 by the above heat and pressure. Furthermore, the support film 11 must be easily peeled from the peelable protective layer 12 after the transfer. Further, the peelable protective layer 12 after transfer has a hologram forming layer 4, a transparent thin film layer 5, a photothermal conversion layer 3 and a thermosensitive recording layer 2.
It is desirable to have the ability to protect the material from chemical or mechanical damage.

The following are mentioned as those having the above properties.

Since the support film 11 is required to have heat resistance, examples thereof include a biaxially stretched polyethylene terephthalate film or a polyethylene naphthalate film.

The peelable protective layer 12 is made of a mixture of a thermo-flexible resin and an anti-friction agent for peeling from the support film 11 and for protecting the hologram forming layer 4 and the like.

As the thermoflexible resin, polymethylmethacrylate or epoxy resin can be used. This is because these are easily peeled off. On the other hand, the anti-friction agent is added to improve wear resistance and scratch resistance. As the anti-friction agent, for example, fluorine resin powder, polyethylene powder, animal wax, plant wax, natural wax such as mineral wax or petroleum wax, synthetic hydrocarbon wax,
Synthetic wax such as fatty acid alcohol and acid wax, fatty acid ester and glycerite wax, hydrogenated wax, synthetic ketone wax, amine and amide wax, chlorinated hydrocarbon wax, synthetic animal wax wax or alpha olefin wax Alternatively, a metal salt of a higher fatty acid such as zinc stearate can be used.

The peelable protective layer 12 contains 85 to 95% by weight of the thermo-flexible resin and 5 to 15% by weight of the anti-friction agent based on 100% by weight of the total amount of the thermo-flexible resin and the anti-friction agent. If Further, the coating amount of the peelable protective layer 12 is 1 to 3 g /
m ² is good.

In the method of applying the peelable protective layer 12, first, the composition of the peelable protective layer 12 is made into a coating material with a suitable solvent. Next, this coating material is applied onto the support film 11 by a coating method such as gravure coating, roll coating or bar code coating, and dried.

The hologram forming layer 4 is the same as the hologram forming layer 4 of FIG. 1 and is appropriately bonded to the peelable protective layer 12. Similarly, the transparent thin film layer 5 and the photothermal conversion layer 3
The thermal recording layer 2 is also the same as that of FIG.

The heat-sensitive adhesive layer 13 needs to be adhered to the surface of the base material 1 such as a plastic material by applying heat and pressure. Therefore, the heat-sensitive adhesive layer 13 is made of thermo-flexible resin. This thermo-flexible resin preferably has a glass transition point (Tg) of 50 to 130 ° C. When the glass transition point is higher than 130 ° C., a high temperature is required for transfer, the base material 1 may be deformed, or the thermosensitive recording layer 2 may be discolored or destroyed. On the other hand, the glass transition point is 5
When the temperature is lower than 0 ° C., the support film 11 is obtained when the transfer sheet of the present invention is stored in a wound state (roll).
The heat-sensitive recording layer 13 adheres to the recording layer 22 and damages the information recording portion 22 (see FIG. 5).

The flexible resin of the heat-sensitive adhesive layer 13 and the coating method thereof are the same as those of the adhesive layer 6.

The thermal transfer sheet 21 thus obtained is overlaid on the base material 1 and heat and pressure are applied to bond them. Then, only the support film 11 is peeled and removed. As a result, the information recording section 22 can be transferred onto the base material 1. This transfer may be performed by heating the heat-sensitive adhesive layer 13 to a temperature equal to or higher than the softening point of the thermoflexible resin contained in the heat-sensitive adhesive layer 13.
The heating temperature is usually 150 to 250 ° C. The heating time may be about 1 to 10 seconds.

[0047]

EXAMPLES Examples of the present invention will be described below.

As an example of the information recording medium according to the first aspect, the information recording medium 20 was directly formed on the base material 1. Each structure used for this formation is as follows.

Substrate 1 Vinyl Chloride Sheet Thermosensitive Recording Layer 2 Leuco Dye (Crystal Violet Lactone) 20% Developer (Bisphenol S) 20% Acrylic Resin 20% Toluene (Solvent) 40% Photothermal Conversion Layer 3 Light Absorber (Cyanine) 2% Acrylic resin 18% Isocyanate curing agent (TDI) 2% Toluene (solvent) 78% Hologram forming layer 4 Mixture of vinyl chloride-vinyl acetate copolymer resin and urethane resin 25% Isocyanate curing agent (TDI) 3 % Methyl ethyl ketone 42% Toluene 30% Transparent thin film layer 5 Zinc sulfide Adhesive layer 6 Polyester resin 30% Toluene (solvent) 70% Protective layer 7 Transparent vinyl chloride sheet

To form the information recording medium 20, first, the thermosensitive recording layer 2 having the above composition ratio is applied to the substrate 1 which is a vinyl chloride sheet having a thickness of 0.56 mm to a thickness of 10 μm. Next, the photothermal conversion layer 3 having the above composition ratio is applied on the thermosensitive recording layer 2 to a thickness of 3 μm. This photothermal conversion layer 3
The hologram forming layer 4 having the above composition ratio is applied thereon to a thickness of 2 μm. However, the thermal recording layer 2, the photothermal conversion layer 3 and the hologram forming layer 4 are applied by the gravure method.

Next, an uneven hologram pattern is formed on the upper surface of the hologram forming layer 4 by heat of 120 ° C. A transparent thin film layer 5 of zinc sulfide is formed on the hologram forming layer 4 to a thickness of 1000 A (angstrom) by vapor deposition. On the transparent thin film layer 5, the adhesive layer 6 having the above composition ratio is applied by a screen method to a thickness of 3 μm. Then, a vinyl chloride sheet having a thickness of 0.1 mm, which is the protective layer 7, is covered on the adhesive layer 6, and the protective layer 7 is heated by heat at 70 ° C.
Are adhered to the adhesive layer 6. As a result, the information recording medium 20
Can be manufactured on the substrate 1.

The information recording medium 20 has a beam diameter of 150 μm.
A printing test was performed by irradiating the semiconductor laser of m. As a result, it was possible to write information on the thermal recording layer 2.
It is also possible to visually confirm this information.

Next, as an example of the transfer sheet according to claim 2, a thermal transfer sheet 21 shown in FIG. 4 was produced. Further, the thermal transfer sheet 21 is thermally transferred to the substrate (transfer target) 1 and the support film 11 is peeled off. As a result, the information recording section 22 shown in FIG. 5 was manufactured. Each structure used for producing the thermal transfer sheet 21 is as follows.

Support film 11 Polyethylene terephthalate film Releasable protective layer 12 Acrylic resin 25% Toluene 30% Methyl ethyl ketone 30% Methyl isobutyl ketone 15% Hologram forming layer 4 Mixture of vinyl chloride-vinyl acetate copolymer resin and urethane resin 25% Isocyanate Curing agent (TDI) 3% Methyl ethyl ketone 42% Toluene 30% Transparent thin film layer 5 Zinc sulfide photothermal conversion layer 3 Light absorber (cyanine dye) 2% Acrylic resin 18% Isocyanate curing agent (TDI) 2% Toluene (solvent) 78 % Heat-sensitive recording layer 2 Leuco dye (crystal violet lactone) 20% Developer (bisphenol S) 20% Acrylic resin 20% Toluene (solvent) 40% Heat-sensitive adhesive layer 13 Polyester resin 30% Toluene (solvent) 70% substrate (transfer member) 1 Vinyl chloride sheet

The thickness of the thermal transfer sheet 21 is 2
On the supporting film 11 which is a polyethylene terephthalate film of 5 μm, the peelable protective layer 12 having the above composition ratio
To a thickness of 2 μm and the hologram forming layer 4 having the above composition ratio.
Is sequentially applied by a gravure method to a thickness of 3 μm. A hologram pattern 120 is formed on the hologram forming layer 4.
It is formed by heat of ℃. On this hologram forming layer 4, a transparent thin film layer 5 of zinc sulfide is formed to a thickness of 500 A by a vapor deposition method. On the transparent thin film layer 5, the photothermal conversion layer 3 having the above composition ratio in a thickness of 3 μm, the thermosensitive recording layer 2 in a thickness of 10 μm, and the thermosensitive adhesive layer 13 in a thickness of 2 μm are sequentially formed by the gravure method. Apply. Then, the substrate 1 made of a vinyl chloride sheet having a thickness of 0.75 mm is covered on the heat-sensitive adhesive layer 13, and 130
The base material 1 is adhered to the heat-sensitive adhesive layer 13 by heat of ° C. As a result, the information recording portion 22 can be formed on the base material 1.

The information recording section 22 has a beam diameter of 150 μm.
The semiconductor laser of No. 1 was irradiated to perform a printing test. As a result, it becomes possible to write information on the thermosensitive recording layer 2, and it is possible to visually confirm this information.

[0057]

According to the present invention, it is possible to provide an information recording medium on which new information can be written without impairing the decorative effect, the forgery preventing effect and the alteration preventing effect peculiar to the hologram. Further, a transfer sheet used for manufacturing this information recording medium can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a configuration example of an information recording medium of the present invention.

FIG. 2 is a vertical cross-sectional view showing the structure of a heat-sensitive recording layer in the information recording medium of the present invention.

FIG. 3 is a vertical cross-sectional view showing the structure of a heat-sensitive recording layer in the information recording medium of the present invention.

FIG. 4 is a vertical sectional view showing a structural example of a transfer sheet of the present invention.

FIG. 5 is a vertical cross-sectional view showing an information recording medium manufactured by the transfer sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Thermal recording layer 3 Photothermal conversion layer 4 Hologram forming layer 5 Transparent thin film layer 6 Adhesive layer 7 Protective layer 8 Self-color-changing layer 9 Concealing layer 10 Coloring layer 11 Support film 12 Peeling protective layer 13 Thermosensitive adhesive layer 20 Information recording Medium 21 Thermal transfer sheet 22 Information recording unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B41M 5/40 G11B 13/00 9075-5D 9121-2H B41M 5/26 B

Claims (2)

[Claims] 1. A hologram in which at least a thermosensitive recording layer, a photothermal conversion layer provided on the thermosensitive recording layer, and a transparent thin film layer and a hologram image provided on the photothermal conversion layer are formed on a substrate. An information recording medium comprising a hologram layer formed of a forming layer. 2. A peeling layer which is peelably provided on a support material, a hologram layer which is provided on the peeling layer and comprises a transparent thin film layer and a hologram forming layer on which a hologram image is formed, and a hologram layer on the hologram layer. A transfer sheet comprising: a photothermal conversion layer provided on the thermosensitive recording layer; a thermosensitive recording layer provided on the photothermal conversion layer; and an adhesive layer provided on the thermosensitive recording layer.