JP7318324B2 - Information recording medium, thermal transfer medium, and method for manufacturing information recording medium - Google Patents

Description

The present invention is an information recording medium and an indirect transfer recording method that are difficult to forge or falsify individual information such as images, patterns, and characters that require security recorded on paper such as passports, ID cards, tickets, and passbooks. and a method for manufacturing an information recording medium using the same.

Conventionally, printed matter on which characters and patterns are printed by various methods, especially personal authentication media such as passports and ID cards, credit cards, passbooks, and other information recording media that require security are printed with ordinary facial photographs and character information. In addition to the image, an image having a special visual effect is provided in order to provide security and design for preventing forgery and falsification.

As a technique for providing an image having a special visual effect, it is widely practiced to attach an optical device such as a so-called hologram or a diffraction grating as a form of transfer foil to a recording medium. These optical devices exhibit special display effects such as color change depending on the viewing angle, rainbow color display, changing, and 3D display, and are highly difficult to manufacture, such as requiring a vacuum process. known and widely used.

However, since these optical devices have become widely used, it is relatively easy to obtain similar ones, and it is difficult to provide individual patterns on the information recording medium due to the manufacturing process, and the same pattern cannot be used. , the effect of preventing forgery and falsification has been limited. Moreover, since it is clear that these optical devices are provided with the aim of preventing counterfeiting, there is a risk that they may conversely induce counterfeiting and falsification.

In addition, for example, in Patent Document 1, patterns of inks with different light transmittance are printed on a transparent card base material, and by allowing light to pass through, a contrast is produced by the difference in the transmittance of the inks of each pattern, and high transmittance is visually observed. A card is disclosed that allows the user to confirm the shape of the ink-resistant ink portion. However, in the card of Patent Document 1, the transparent pattern must be printed at the time of molding the card, and only a pattern such as a fixed design can be provided. However, the scope of application was limited.

Further, Patent Document 2 discloses a method of forming a latent image using fluorescent ink. A colorless fluorescent ink containing a substance is printed on a card to form a latent image. However, in order to make it possible to determine whether or not the displayed contents of the issued card are genuine, it was necessary to create a printed version for each card, which was not practical.

Japanese Patent No. 4742725 Registered Utility Model No. 3029273

The present invention has been made in view of these problems, and it is possible to determine whether or not the information printed on each information recording medium is genuine, and to tamper with it without leaving any trace of fraudulent activity. To provide an information recording medium which is difficult to process and hardly induces forgery or falsification, a thermal transfer medium suitable for an indirect transfer recording system, and a method for manufacturing the information recording medium using the same.

In order to solve the above problems, the invention according to claim 1 of the present invention is
a first image forming unit formed of C, M, and Y ink layers;
a character information forming portion formed of a Bk ink layer;
A light scattering layer, an IR black layer, a second image forming section formed of C, M and Y ink layers, a security pattern containing individual information formed of a Bk ink layer, and a negative of the security pattern formed of the IR black layer A security formation part in which a hidden information layer combined with a pattern is sequentially laminated from the surface side to the base material side,
an overlay layer covering the parts;
is provided on a substrate.

Further, the invention according to claim 2 of the present invention is
An overlay layer is detachably provided on a support, and on a part of the overlay layer, a light scattering layer both having thermal transferability, and an IR black layer made of ink that transmits near infrared rays and absorbs visible light. are sequentially laminated intermediate transfer media;
A thermal transfer ribbon in which at least four color ink layers of C, M, Y, and Bk and an IR black layer, all of which have thermal transferability, are separately painted in a plane-sequential manner;
A thermal transfer medium for indirect transfer recording consisting of

Further, the invention according to claim 3 of the present invention is
an intermediate transfer medium having an overlay layer detachably provided on a support;
A light scattering layer, an IR black layer made of ink that transmits near-infrared rays and absorbs visible light, an ink layer of at least four colors of C, M, Y, and Bk, and an IR black layer, all of which have thermal transferability, A thermal transfer ribbon that is painted sequentially,
A thermal transfer medium for indirect transfer recording consisting of

Further, the invention according to claim 4 of the present invention is
A method for manufacturing an information recording medium by an indirect transfer recording system using the thermal transfer medium according to claim 2,
from the thermal transfer ribbon onto the overlay layer of the intermediate transfer medium,
A first image forming section to which the C, M, and Y ink layers are transferred and a character information forming section to which the Bk ink layer is transferred are provided,
from the thermal transfer ribbon onto the IR black layer of the intermediate transfer medium,
A second image layer composed of C, M, and Y ink layers, and a hidden information layer in which a security pattern containing individual information composed of a Bk ink layer and a negative pattern of the security pattern composed of an IR black layer are combined are sequentially transferred. A security forming part is provided by stacking,
Manufacture of an information recording medium characterized in that an intermediate transfer medium is superimposed on an information recording medium, and a first image forming section, a character information forming section, a security forming section, and an overlay layer are thermally and pressure-transferred onto the information recording medium by thermal pressure transfer. The method.

Further, the invention according to claim 5 of the present invention is
A method for manufacturing an information recording medium by an indirect transfer recording system using the thermal transfer medium according to claim 3,
from the thermal transfer ribbon onto the overlay layer of the intermediate transfer medium,
transferring a light scattering layer and an IR black layer overlying the light scattering layer;
A first image forming section having transferred C, M, and Y ink layers and a character information forming section having transferred Bk ink layer are provided on a site other than the IR black layer,
Concealment by combining a second image layer with C, M, and Y ink layers, a security pattern containing individual information with a Bk ink layer, and a negative pattern of the security pattern with an IR black layer overlaid on the IR black layer. Information layers are sequentially transferred and laminated to provide a security forming part,
Manufacture of an information recording medium characterized in that an intermediate transfer medium is superimposed on an information recording medium, and a first image forming section, a character information forming section, a security forming section, and an overlay layer are thermally and pressure-transferred onto the information recording medium by thermal pressure transfer. The method.

The present invention applies not only a fixed pattern provided by a method such as printing when manufacturing an information recording medium, but also individual information such as personal information and variable information to information recording mediums such as ID cards and passports that require high security. , an information recording medium recorded on demand while maintaining security as a security pattern invisible under normal lighting conditions, a thermal transfer medium for indirect transfer recording, and a method for manufacturing an information recording medium using the thermal transfer medium can provide

More specifically, by thermally transferring the color ink of each color of the thermal transfer ribbon to the intermediate transfer medium by a known heating means such as a thermal head, it is possible to provide a normal color image and an ink character image, and at the same time, light scattering is possible. A layer and an IR black layer made of ink that transmits near infrared rays and absorbs visible light are laminated as a security part, and the security part is colored with cyan (also simply referred to as C. The same applies hereinafter.), magenta (M ), a combination of a second image layer formed of a yellow (Y) ink layer, a security pattern containing individual information formed of a black (Bk) ink layer, and a negative pattern of the security pattern formed of an IR black layer. By overlapping and transferring the concealed information layer, the security pattern of the concealed information layer becomes visible only when irradiated with near-infrared rays, and cannot be copied with a copier, etc., and can be used under normal lighting conditions. In this case, the fact that the security pattern and the second image layer are provided there is simply visible in black, and the fact that the security pattern and the second image layer are provided there is not known.

Even if the security pattern is to be tampered with, the security pattern is re-transferred from the intermediate transfer medium to the information recording medium by the indirect transfer recording method, so that the security pattern is on the innermost layer side of the information recording medium, and the security pattern is on the upper layer side at the time of tampering. In addition, the security pattern is a combination of the IR black layer ink and the Bk ink layer by tweezers. Therefore, it is possible to obtain an information recording medium that can be easily discriminated if it has been tampered with.

1 is a perspective view showing an example of a thermal transfer ribbon 1 of the thermal transfer medium of the present invention; FIG. FIG. 4 is a cross-sectional view showing an example of a combination of thermal transfer media of the present invention; FIG. 2 is a perspective view showing an example of a thermal transfer ribbon 7 of the thermal transfer medium of the present invention; FIG. 4 is a cross-sectional view showing an example of a second combination of thermal transfer media of the present invention; FIG. 3 is a schematic cross-sectional view showing an example of an intermediate transfer foil that is primarily transferred using the thermal transfer medium of the present invention; 1 is a plan view showing an example of an information recording medium of the present invention; FIG. FIG. 7 is a cross-sectional view taken along line AA' of FIG. 6; 1 is a conceptual diagram showing an example of an indirect transfer recording type recording apparatus; FIG. FIG. 4 is an explanatory view showing an example in which strong visible light is transmitted through the information recording medium of the present invention; FIG. 4 is an explanatory view showing an example of reading by a CCD camera after irradiating the information recording medium of the present invention with near-infrared rays.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Further, in the following description, the same reference numerals may be given to the same members, etc., and the description thereof may be omitted.

FIG. 1 is a perspective view showing an example of a thermal transfer ribbon 1 of the thermal transfer medium of the present invention. On the surface side of a long ribbon-like heat-resistant support 2, C, M, Y, and Bk ink layers each made of thermal transfer ink, and an IR layer made of thermal transfer ink that transmits near-infrared rays and absorbs visible light. The black layer IR2 is applied in a frame-sequential manner and wound into a roll.

As the support 2, those commonly used for thermal transfer ribbons can be used, and polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are particularly preferred. A thickness of 2 to 50 μm can be used, and a thickness of 2 to 16 μm is more preferable. A back coat layer may be provided on the back side of the support 2 in consideration of running properties during thermal transfer.

The thermal transfer ink that constitutes the IR black layer IR2 is an ink that transmits part of visible light wavelengths of 400 to 780 nm and near infrared rays of 780 to 1400 nm wavelengths. On the other hand, black Bk ink is an ink that absorbs light with a wavelength of 400 to 1400 nm. These inks may be a single ink or a mixture of two or more inks as long as they have a wavelength that does not interfere with the light transmission portion and light absorption portion and are of the same color.

As the color inks of C, M, and Y, those known as three primary colors of subtractive color mixture for expressing a full-color image can be used. Further, if necessary, a special color ink layer other than this can be provided.

Each of the thermal transfer inks described above may be of the sublimation transfer type or the melt transfer type. However, the melt transfer ink having high durability is more suitable for personal authentication information recording media. preferable.

FIG. 2 is a cross-sectional view showing an example of a combination of thermal transfer media of the present invention. The intermediate transfer medium 6 has the overlay layer 4 detachably provided on the support 3, and is detached from the support 3 and transferred to the information recording medium during secondary transfer in the indirect transfer recording method. The overlay layer 3 may have a single layer structure as shown in the figure, but may also have a structure in which a separation protective layer, an intermediate layer, an image receiving layer, etc. are laminated.

The intermediate transfer medium 6 has a light scattering layer 5 and an IR black layer IR1 laminated on a part thereof in each area corresponding to the recording surface of the information recording medium, which is the subject of secondary transfer. The place where the light scattering layer 5 and the IR black layer IR1 are laminated corresponds to the position where the security pattern is provided on the information recording medium by secondary transfer, and is the place where the security is formed. The light scattering layer 5 and the IR black layer IR1 can also be provided by general printing such as gravure printing, coating, and the like.

FIG. 2 is a schematic diagram, and the area of each thermal transfer ink layer may be an area sufficient for recording on the entire recording surface of the information recording medium. However, the IR black layer IR2 may have an area equivalent to that of the light scattering layer 5 and the IR black layer IR1.

Primary transfer from the thermal transfer ribbon 1 to the intermediate transfer medium 6 is performed as follows. The thermal transfer ribbon 1 is brought into contact with the overlay layer 4 side of the intermediate transfer medium 6, and the C, M, and Y color inks are thermally transferred from the thermal transfer ribbon 1 by the thermal head to the intermediate transfer medium 6 at a location other than the security forming portion. A color image such as a face photograph is formed in the set first image forming section, and a second color image is transferred onto the IR black layer IR1 to provide a second image layer. Similarly, Bk ink is thermally transferred to the character information forming portion to form character information such as characters and symbols, and Bk ink is thermally transferred onto the second image layer to form arbitrary individual information such as names and ID numbers. Establish a security pattern that includes Next, the IR black layer IR2 is thermally transferred onto the security pattern in a pattern that is a negative pattern of the security pattern to form a hidden information layer in which the Bk ink pattern and the IR black layer IR2 ink pattern are combined in a combed manner. Primary transfer is performed as described above.

At this time, the security pattern can be an arbitrary pattern by appropriately controlling the heating of the thermal head, and can be a different pattern for each recording surface of the information recording medium, that is, a pattern of individual information.

FIG. 3 is a perspective view showing an example of the thermal transfer ribbon 7 of the thermal transfer medium of the present invention. FIG. 4 is a sectional view showing an example of a second combination of thermal transfer media of the present invention. Materials similar to those in the above examples can be used for the members of the thermal transfer medium.

The thermal transfer ribbon 7 includes a light diffusion layer 5 made of thermally transferable ink, an IR black layer IR1, C, M, Y, and Bk ink layers on the surface side of a long ribbon-like heat-resistant support 2. The IR black layer IR2 is applied in a frame-sequential manner and wound into a roll. Further, the intermediate transfer medium 8 has the overlay layer 4 provided on the support 3 in a detachable manner.

Primary transfer from the thermal transfer ribbon 7 to the intermediate transfer medium 8 is performed as follows. The thermal transfer ribbon 7 is brought into contact with the overlay layer 4 side of the intermediate transfer medium 8, and the light diffusing layer 5 and the IR black layer IR1 are transferred from the thermal transfer ribbon 7 to the security formation portion in a predetermined size by the thermal head. Next, the C, M, and Y color inks are thermally transferred to form a color image such as a photograph of the face on the first image forming section set at a location other than the security forming section of the intermediate transfer medium 8, and A second color image is transferred onto IR black layer IR1 to provide a second image layer. Similarly, Bk ink is thermally transferred to the character information forming portion to form character information such as characters and symbols, and Bk ink is thermally transferred onto the second image layer to form arbitrary individual information such as names and ID numbers. Establish a security pattern that includes Next, the IR black layer IR2 is thermally transferred onto the security pattern in a pattern that is a negative pattern of the security pattern to form a hidden information layer in which the Bk ink pattern and the IR black layer IR2 ink pattern are combined in a combed manner. The thermal head, which is the recording head of the indirect transfer type recording device, can perform high-definition recording at 300 DPI to 600 DPI, and can combine the Bk ink pattern and the IR black layer IR2 ink pattern in a combed manner. be. Primary transfer is performed as described above.

FIG. 5 is a schematic cross-sectional view showing an example of an intermediate transfer medium on which primary transfer is performed using the thermal transfer medium of the present invention. In both of the above-described two examples, after the primary transfer, the state is the same as that shown in FIG. It is formed. In the first image forming unit 10, C, M, and Y ink layers are transferred to form a color image, for example, an image such as a face photograph is formed. The character information forming unit 11 records information such as characters, symbols, and logos in a single color with Bk ink. In the security formation portion 12, the light diffusion layer 5 and the IR black layer IR1 are laminated, and a second image layer 28 is formed on which a second color image is formed using C, M, and Y color inks. A hidden information layer 29 is formed by combining a security pattern of Bk ink and a negative pattern of the security pattern of IR black layer IR2.

Here, for example, the first image forming unit 10 is illustrated so that the C, M, and Y ink layers are juxtaposed because the first image forming unit 10 has the C, M, and Y ink layers. It schematically shows that it is formed from, and it is not actually juxtaposed, and the others are the same.

The intermediate transfer medium 9 having such a configuration is superimposed on the recording surface of the information recording medium, which is the final recording medium, and is subjected to secondary transfer including the overlay layer 4 by applying heat and pressure, thereby forming the information recording medium. Finalize. An adhesive layer may be provided on the recording surface of the information recording medium in order to improve adhesiveness.

FIG. 6 is a plan view showing an example of the information recording medium of the present invention, showing an example of the information recording medium after secondary transfer as described above, viewed under normal irradiation conditions. be. Here, the information recording medium 21 is an example of a passport. The first image forming section 10 records a photograph of the face, the character information forming section 11 records characters, and the security forming section 12 forms an IR black sheet on the front side. Since the layer IR1 can be seen through the light-scattering layer 5, the whole appears almost black. Therefore, since the fact that an image or characters are hidden in the security formation unit 12 is not known, it does not become a trigger for forgery or falsification, and thus has the effect of suppressing forgery or falsification.

FIG. 7 shows a cross section of the information recording medium 21 of FIG. 6 cut along a straight line AA'. The first image forming portion 10 , the character information forming portion 11 , the security forming portion 12 and the overlay layer 4 are transferred to the recording surface side of the base material 20 via the adhesive layer 22 . In the security forming portion 12, the second image layer 28 and the hidden information layer 29 are formed inside as described above, although they cannot be seen from the outside under the condition of irradiation with visible light. The substrate 20 is not particularly limited, but in the case of a passport, general paper, security paper, synthetic paper, plastic sheet, etc. can be exemplified.

By applying the thermal transfer medium of the present invention to a recording apparatus of an indirect transfer recording system, the information recording medium of the present invention can be produced. FIG. 8 is a conceptual diagram showing an example of an indirect transfer recording type recording apparatus. The intermediate transfer media 6 and 8 pass from the intermediate transfer medium unwinding portion 16 through between the thermal head 15 and the platen roller 19 of the primary transfer portion, and then pass between the heat roller 18 and the backup roller 30 of the secondary transfer portion to the intermediate transfer medium. It is taken up by the transfer medium take-up unit 17 . The thermal transfer ribbons 1 and 7 pass between the thermal head 15 and the platen roller 19 of the primary transfer section from the thermal transfer ribbon unwinding section 13 and are wound up by the thermal transfer ribbon winding section 14 .

The thermal head 15 and the platen roller 19 of the primary transfer portion are pressed against each other during the primary transfer to bring the thermal transfer ribbons 1 and 7 and the intermediate transfer media 6 and 8 into close contact with each other, and the thermal head 15 is moved according to desired recording information. The thermal transfer ink of the thermal transfer ribbons 1 and 7 is transferred to the intermediate transfer media 6 and 8 by heating the heating elements.

The heat roller 18 and the backup roller 30 of the secondary transfer portion nip the intermediate transfer medium 6, 8 on which desired information is recorded and the information recording medium 21 at the time of the secondary transfer, and convey them while applying heat and pressure. Then, the first image forming portion, the character information forming portion, the security forming portion, and the overlay layer are transferred to the information recording medium 21 .

Next, a method for verifying the security formation portion provided on the information recording medium of the present invention will be described. FIG. 9 is an explanatory diagram showing an example in which strong visible light is transmitted through the information recording medium of the present invention. Under normal irradiation conditions, the second image layer 28 and the concealed information layer 29 of the security formation portion 12 are invisible due to the presence of the IR black layer IR1 and the IR black layer IR2. By selecting the material, thickness, etc. of the base material, the second image 24 of the second image layer can be seen faintly with the slightly transmitted light when the back side of the base material is irradiated with the light source. Therefore, whether or not the second image 24 can be seen can be used as a means for judging authenticity.

As another verification method, FIG. 10 is an explanatory diagram showing an example in which the information recording medium of the present invention was irradiated with near-infrared rays and read by a CCD camera. Many CCD cameras are capable of detecting not only visible light but also near-infrared rays, so they are easy to apply. When the information recording medium 21 of the present invention is imaged by the CCD camera 25, the irradiated near-infrared rays are not absorbed by the IR black layer IR1 and the IR black layer IR2 of the concealed information layer 29, and are absorbed by the Bk ink layer of the concealed information layer 29. It is imaged in an absorbed manner only with a security pattern containing individual information. If the result is displayed on the monitor 26 or the like, a concealment image 27 provided as a security pattern at the portion of the security forming portion 12 is displayed. Therefore, whether or not the concealment image 27 is displayed can be used as a means for judging authenticity.

As described above, the thermal transfer medium of the present invention and the information recording medium using the same can be provided with a security pattern that cannot be seen under normal lighting conditions as a concealed image, without causing forgery or tampering. Also, it is possible to provide a thermal transfer medium and an information recording medium using the same, on which it is easy to determine whether or not there is a trace of forgery or falsification.

EXAMPLES The present invention will be described in more detail with reference to examples below. In addition, the present invention is not limited to the following examples.

<Example 1>
[Preparation of intermediate transfer medium]
An intermediate transfer medium A similar to that of FIG. 2 was obtained in the following manner.
On one side of a PET substrate with a thickness of 12 μm,
An epoxy resin is formed to a thickness of 0.8 μm by a gravure coater to form an overlay layer, and a mixed resin obtained by mixing a polyester resin and a filler is partially formed to a thickness of 4.0 μm by a comma coater to form a light diffusion layer,
A mixed resin obtained by mixing a polyester-based resin and an IR black pigment was formed to a thickness of 1.0 μm by a gravure coater and layered as an IR black layer IR1.

(Ink composition of overlay layer)
jER1003 (Mitsubishi Chemical Corporation) 20 parts by weight MEK/TL (1:1) 80 parts by weight

(Ink composition of light scattering layer)
Byron 500 (Toyobo Co., Ltd.) 25 parts by weight Silo Hobic 100 (Fuji Silysia Co., Ltd.) 5 parts by weight MEK/TL (1:1) 70 parts by weight

(Ink composition of IR black layer)
Cyan pigment 2 parts by weight Magenta pigment 2 parts by weight Yellow pigment 2 parts by weight Vylon 500 (Toyobo Co., Ltd.) 14 parts by weight MEK/TL (1:1) 84 parts by weight

[Preparation of thermal transfer ribbon]
A thermal transfer ribbon A similar to that shown in FIG. 2 was obtained as follows.
On one side of a PET substrate with a thickness of 12 μm,
A mixed resin obtained by mixing each pigment of cyan (C), magenta (M), yellow (Y), black (Bk), and IR black (IR) into a polyester resin was coated face-sequentially with a thickness of 1.0 μm by a gravure coater. It was formed by painting separately.

(Composition of cyan ink)
Cyan pigment 5 parts by weight Vylon 500 (Toyobo Co., Ltd.) 15 parts by weight MEK/TL (1:1) 80 parts by weight

(Composition of magenta ink)
Magenta pigment 5 parts by weight Vylon 500 (Toyobo Co., Ltd.) 15 parts by weight MEK/TL (1:1) 80 parts by weight

(Composition of yellow ink)
Yellow pigment 5 parts by weight Vylon 500 (Toyobo Co., Ltd.) 15 parts by weight MEK/TL (1:1) 80 parts by weight

(Composition of black ink)
Carbon black pigment 5 parts by weight Vylon 500 (Toyobo Co., Ltd.) 15 parts by weight MEK/TL (1:1) 80 parts by weight

(Composition of IR black ink)
The ink for the IR black layer of the intermediate transfer medium A was the same.

[Production of information recording medium]
The above intermediate transfer medium A and thermal transfer ribbon A are mounted on an indirect transfer recording type passport issuing printer eP600 (Toppan Printing Co., Ltd.), and primary and secondary transfer are performed using passport paper as an information recording medium to record information. got a body

<Example 2>
[Preparation of intermediate transfer medium]
An intermediate transfer medium B similar to that shown in FIG. 4 was obtained in the following manner.
An overlay layer was formed by forming an epoxy resin to a thickness of 0.8 μm on one side of a PET substrate having a thickness of 12 μm using a gravure coater.

[Preparation of thermal transfer ribbon]
A thermal transfer ribbon B similar to that shown in FIG. 4 was obtained as follows.
On one side of a PET substrate with a thickness of 12 μm,
A light diffusion layer, an IR black layer IR1, C, M, Y, Bk, and an IR black layer IR2 were formed by separately painting the layers in a frame-sequential manner.
The light diffusion layer was formed by a comma coater to a thickness of 4.0 μm with a mixed resin obtained by mixing a polyester resin and a filler.
IR black layers IR1, C, M, Y, Bk, and IR black layers IR2 are each made of a mixed resin in which IR black, cyan, magenta, yellow, black, and IR black pigments are mixed in a polyester resin to a thickness of 1.5 mm. It was formed with a gravure coater to 0 μm.

[Production of information recording medium]
An information recording medium was obtained in the same manner as in Example 1 using the intermediate transfer medium B and the thermal transfer ribbon B described above.

<Comparative Example 1>
By changing the IR black layer IR1 portion of the intermediate transfer medium A of Example 1 to black (Bk), the IR black layer IR1 of the second image formed in the security formation portion was changed to black (Bk). , an information recording medium similar to that of Example 1 was obtained.

<Evaluation>
For the obtained information recording body,
・Authentication judgment 1 Visual confirmation of the second image by strong visible light irradiation ・Authentication judgment 2 Authenticity judgment was performed by two methods of mechanical reading of concealed information by a CCD camera.
Table 1 summarizes the evaluation results of the above examples and comparative examples.

The information recording media of Example 1, Example 2, and Comparative Example 1 did not differ in appearance under normal lighting conditions, but there was a difference when authenticity determination was performed. In Examples 1 and 2 of the present invention, good judgment results were obtained in both of the two types of authenticity judgment methods, and a high security effect was confirmed. could not be determined.

1, 7 Thermal transfer ribbons 2, 3 Support C Cyan M Magenta Y Yellow Bk Black IR1, IR2 IR black layer 4 Overlay Layer 5 Light scattering layers 6, 8, 9 Intermediate transfer medium 10 First image forming unit 11 Character information forming unit 12 Security forming unit 13 Thermal transfer ribbon winding Feeding section 14 Thermal transfer ribbon winding section 15 Thermal head 16 Intermediate transfer medium feeding section 17 Intermediate transfer medium winding section 18 Heat roller 19 Platen roller 20 Information recording medium base material 21 Information recording medium 22 Adhesive 23 Visible light 24 Second image 25 CCD camera 26 Monitor 27 Concealment Image 28 Second image layer 29 Hidden information layer 30 Backup roller 100 Printer

Claims (3)

a first image forming unit formed of C, M, and Y ink layers;
a character information forming portion formed of a Bk ink layer;
A light scattering layer, an IR black layer, a second image forming section formed of C, M and Y ink layers, a security pattern containing individual information formed of a Bk ink layer, and a negative of the security pattern formed of the IR black layer A security formation part in which a hidden information layer combined with a pattern is sequentially laminated from the surface side to the base material side,
an overlay layer covering the parts;
is provided on a substrate. An overlay layer is detachably provided on a support, and on a part of the overlay layer, a light scattering layer both having thermal transferability, and an IR black layer made of ink that transmits near infrared rays and absorbs visible light. are sequentially laminated intermediate transfer media;
A thermal transfer ribbon in which at least four color ink layers of C, M, Y, and Bk and an IR black layer, all of which have thermal transferability, are separately painted in a plane-sequential manner;
A method for manufacturing an information recording medium by an indirect transfer recording method using a thermal transfer medium for indirect transfer recording consisting of
providing a first image forming section for transferring C, M and Y ink layers from a thermal transfer ribbon onto an overlay layer of an intermediate transfer medium and a character information forming section for transferring a Bk ink layer;
From the thermal transfer ribbon onto the IR black layer of the intermediate transfer medium, a second image layer composed of C, M, and Y ink layers, a security pattern containing individual information composed of a Bk ink layer, and a negative pattern of the security pattern composed of an IR black layer. A hidden information layer combined with is sequentially transferred and laminated to provide a security forming part,
Manufacture of an information recording medium characterized in that an intermediate transfer medium is superimposed on an information recording medium, and a first image forming section, a character information forming section, a security forming section, and an overlay layer are thermally and pressure-transferred onto the information recording medium by thermal pressure transfer. Method. an intermediate transfer medium having an overlay layer detachably provided on a support;
A light scattering layer, an IR black layer made of ink that transmits near-infrared rays and absorbs visible light, an ink layer of at least four colors of C, M, Y, and Bk, and an IR black layer, all of which have thermal transferability, A thermal transfer ribbon that is painted sequentially,
A method for manufacturing an information recording medium by an indirect transfer recording method using a thermal transfer medium for indirect transfer recording consisting of
transferring the light scattering layer and the IR black layer overlying the light scattering layer from the thermal transfer ribbon onto the overlay layer of the intermediate transfer medium;
A first image forming section having transferred C, M, and Y ink layers and a character information forming section having transferred Bk ink layer are provided on a site other than the IR black layer,
Concealment by combining a second image layer with C, M, and Y ink layers, a security pattern containing individual information with a Bk ink layer, and a negative pattern of the security pattern with an IR black layer overlaid on the IR black layer. Information layers are sequentially transferred and laminated to provide a security forming part,
Manufacture of an information recording medium characterized in that an intermediate transfer medium is superimposed on an information recording medium, and a first image forming section, a character information forming section, a security forming section, and an overlay layer are thermally and pressure-transferred onto the information recording medium by thermal pressure transfer. Method.