JP2023026824A - Information recording body and heat-sensitive transfer medium - Google Patents

Abstract

To provide an information recording body for a booklet such as a passport and a visa that require a high security property and a credit card, which has a high counterfeit prevention effect and has an image whose authenticity is easy to determine and to provide a heat-sensitive transfer medium provided for the manufacturing thereof.SOLUTION: The information recording body is formed by laminating the following each comprised of a plastic sheet in this order: the first protective layer; a laser color development layer; a core layer; the second protective layer; and an overlay layer. The overlay layer includes the first security pattern whose image is formed by at least infrared permeation ink on demand, and the image obtained by overlapping the first pattern and the second security pattern where image is formed on the laser color development layer on demand by laser engraving can display different security pattern information depending on observation angles. And also a heat-sensitive transfer medium is provided for the manufacturing of the information recording body.SELECTED DRAWING: Figure 1

Description

The present invention relates to an information recording medium such as a booklet such as a passport or a visa, a card, or the like, and an information recording medium having an image highly effective in preventing counterfeiting, and a thermal transfer medium.

2. Description of the Related Art Various security methods have been proposed to protect personal information in information recording bodies related to personal authentication, such as passports, visa stickers, and ID cards.

For example, according to the currently used passport or ICAO (International Civil Aviation Organization) regulations, it must be readable both visually and by optical character recognition. It is said to be at the discretion of each country.

Commonly used security features include chemical reactants that react with organic solvents, etc., iridescent pearl chips, fibers (silk or synthetic fibers, visible or invisible, fluorescent or non-fluorescent), holograms, and microcharacter printing. Security threads of printed films, paper with watermark patterns, etc., various inks such as fading ink, fluorescent ink, thermal ink, optically changing ink (so-called OVI etc.), fine line printing, rainbow printing, intaglio printing, We are trying to simultaneously improve security and aesthetics by incorporating various techniques such as pixel printing.

Conventionally, a face photograph as visual confirmation information in a passport is a combination of photographs, but in recent years, there is a tendency to digitize the photograph information and form an image on the passport. As a method of forming images on passports, there are thermal transfer recording methods using transfer ribbons such as the resin-type melting type, the wax-melting type, and the sublimation type using dye sublimation/diffusion, electrophotography, and inkjet. Laws, etc. are being considered.

Image display media containing personal authentication data of this type include those in which an image pattern formed based on image data is provided on a base material such as polyvinyl chloride or polycarbonate, or on a paper base material. Further, in addition to the above image pattern, there is known one having a hologram or a diffraction grating.

A method of inserting a plurality of pieces of information for identifying an individual in addition to a photograph of the face is being considered. For example, there is a method of authentication by inserting digital watermark information in a facial photograph, storing the information in an IC chip in the same medium, and collating the digital watermark information with the information in the IC chip (Patent Document 1 below). .

There is also a method of digitizing the feature points of face photo information, converting the values into two-dimensional codes, printing them on the same medium, and comparing the two-dimensional code data with the feature points of the face photo for authentication ( Patent Document 2 below).

However, the techniques of Patent Document 2 and Patent Document 3 below require a dedicated device and decoder for reading the information on the IC chip and the two-dimensional code.

As another verification method, there is a method of inserting multiple facial photographs that can be authenticated by visual information. Patent documents 3, 4, 5).

However, the method using these fluorescent materials requires the use of an ultraviolet lamp (black light), so the situations in which authentication is possible are limited.

As a method for forming a hologram or a diffraction grating in addition to an image pattern such as a photograph of a face, image formation by an intermediate transfer method using an intermediate transfer medium having a hologram layer as an image receiving sheet on which an image pattern such as a photograph of the face is formed. and the like (Patent Document 6 below).

Such a hologram or diffraction grating transfer foil performs a sufficient function as an anti-counterfeiting effect. For this reason, with the development of counterfeiting technology, there is a possibility that the transfer layer will be removed by some method, the image data etc. will be falsified, and then the transfer foil will be placed again.

In order to solve this problem, a masking pattern is applied under the optical element, and two colors of yellow (Y), magenta (M), and cyan (C) are used to form the pattern, thereby creating moire patterns with color changes. A technique for forming and visually recognizing is proposed (Patent Document 7 below).

However, in the technique of Patent Document 7 below, it is necessary to visually recognize the concealing pattern through an optical element from the side opposite to the side on which the pattern is printed, and there is a problem that the authentication procedure becomes complicated.

JP 2001-126046 A Japanese Patent Application Laid-Open No. 2004-70532 JP-A-7-125403 JP-A-2000-141863 JP-A-2002-226740 JP-A-6-106740 JP 2019-142083 A

Therefore, the present invention has been made in order to cope with the above-mentioned problems. Further, it is an object of the present invention to provide an information recording medium having an image whose authenticity can be easily determined, and a thermal transfer medium for producing the information recording medium.

As a means for solving the above-mentioned problems, the invention according to claim 1 comprises a first protective layer, a laser coloring layer, a core layer, a second protective layer, and an overlay layer, which are each made of a plastic sheet, laminated in this order. wherein the overlay layer includes at least a first security pattern image-formed on demand with infrared transmissive ink, and the first pattern and the laser coloring layer are turned on by laser engraving An image obtained by superimposing the second security pattern image formed on demand is an information recording medium capable of displaying different security pattern information depending on the viewing angle.

According to a second aspect of the present invention, there is provided the information recording medium according to the first aspect, wherein the security pattern information that varies depending on the viewing angle is visualized by a moire pattern.

According to a third aspect of the invention, the overlay layer is laminated by bonding an intermediate transfer foil containing a pattern formed by a thermal transfer method to the second protective layer. 3. An information recording medium according to items 1 and 2.

Further, the invention according to claim 4 is a thermal transfer medium for forming a pattern by the thermal transfer method, which is used for producing the information recording medium according to claims 1 to 3, comprising: Black (K), cyan (C), magenta (M), and yellow (Y) ink panels, functional (S) ink panels that serve as security layers, and primer (P) ink panels that serve as adhesive layers in sequence. A thermal recording medium characterized by comprising:

Further, the invention according to claim 5 is the thermal recording medium according to claim 4, wherein the functional ink is an infrared transmitting ink.

According to the present invention, different patterns can be displayed simply by changing the viewing angle of the information recording medium, and the authenticity of the information recording medium can be easily confirmed.

Further, according to the present invention, since both the first pattern formed with infrared transmissive ink and the second pattern formed by laser engraving can be formed on demand, a printing plate is not required. It becomes possible to manufacture a large amount of individually unique information recording media without the need for manufacturing.

Further, according to the present invention, since the first pattern can be formed in a single color by an infrared transmissive ink panel, the formation of a fine image required for moiré generation does not require precise alignment required in the case of multicolor, It becomes possible to do it easily.

Further, according to the present invention, when the second pattern formed directly below the first pattern is formed by laser engraving, since the first pattern is made of infrared transmitting ink, the quality of laser engraving is improved. no influence.

Further, according to the present invention, the pattern of the overlay including the first pattern can be formed using conventional thermal transfer equipment without requiring special image forming equipment for security.

In addition, according to the present invention, the pattern for confirming authenticity is not an image of a single layer, but is expressed only by combining images of different layers formed by two different methods, so alteration and counterfeiting is extremely difficult. A difficult information recording body can be provided.

1 is a schematic diagram showing an example of a thermal transfer medium in an example of the present invention; FIG. 1 is a schematic diagram showing an example of a printer that issues an information recording medium of the present invention; FIG. It is a schematic diagram of an example of the information recording medium issued by this invention. 1 is a cross-sectional view of an information recording medium cut along line A-A' in an embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view showing an example of positions and viewing angles of patterns 1 and 2 in the embodiment of the present invention; FIG. 4 is a schematic diagram showing an example of image change of a security image (moiré image) when the information recording medium is tilted in the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. Although the drawings will be referred to in the following description as appropriate, the aspects described in the drawings are examples of the present invention, and the present invention is not limited to the aspects described in these drawings.

It should be noted that the same reference numerals are used throughout the drawings for all constituent elements that exhibit the same or similar functions, and overlapping descriptions will be omitted.

(Thermal transfer medium)
FIG. 1 is a perspective view of a thermal transfer medium according to one embodiment of the invention.
A thermal transfer medium 1 shown in FIG. 1 has a strip shape. In FIG. 1, a thermal transfer medium 1 is in the form of a roll with one end unwound. The thermal transfer medium 1 may have other shapes.

The thermal transfer medium 1 includes a support 2, ink panels K, C, M, and Y as color material layers, an infrared absorption ink panel S as a security layer, and a primer ink panel P as an adhesive layer. . If necessary, a fluorescent panel or a bright panel may be additionally inserted.

The support 2 has a strip shape. The support 2 may have other shapes.
The support 2 has sufficient resistance to heat during transfer. The support 2 is, for example, a polymer film such as polyethylene terephthalate film. The support 2 may have a single layer structure or a multilayer structure.

Ink panels K, C, M, Y, S and P are provided on one main surface of the support 2 . More specifically, on the main surface of the support 2, a plurality of ink panel groups each consisting of ink panels K, C, M, Y, S, and P are arranged in the in-plane direction, here, the support 2. are arranged in the longitudinal direction of the In each ink panel group, the ink panels K, C, M, Y, S and P are arranged in the in-plane direction. Here, in each ink panel group, ink panels K, C, M, Y, S and P are arranged in this order in the longitudinal direction of the support 2 . Also, here, the ink panels K, C, M, Y, S, and P each have a strip shape extending in the width direction of the support 2 .

Each hue panel, ink panel K, C, M, and Y, is a color ink panel for black, cyan, magenta, and yellow, respectively. Each of the ink panels K, C, M and Y consists of thermal transfer ink. Here, the thermal transfer ink is color ink containing a coloring material and a binder resin. The colorants included in ink panels K, C, M and Y are one or more pigments, one or more dyes, or combinations thereof. The color inks forming the ink panel K, the color inks forming the ink panel C, the color inks forming the ink panel M, and the color inks forming the ink panel Y each emit white light. It exhibits black, cyan, magenta and yellow colors when illuminated at .

The infrared transmitting ink used for the ink panel S is generally produced by mixing cyan, magenta, and yellow pigments, which are process colors, to give a black color. In addition, bisbenzofuran-based pigments, azomethine-based pigments, perylene-based pigments, azo-based dyes and bismuth sulfide pigments can be used.

As the binder used for each hue panel and ink panel S, any substantially transparent thermoplastic resin can be used. For example, acrylic resin, urethane resin, styrene resin, and polyester resin can be used. , Epoxy resins, vinyl resins, rosin resins, polyolefin resins, polyamide resins, etc. can be exemplified, but are not necessarily limited to these. can be used as a composite such as a copolymer. Further, fillers and waxes exemplified by silica, talc, calcium carbonate and the like may be added.

The thermoplastic resin used for the ink panel P may be any material that adheres the transfer foil and the base material (plastic) of the information recording medium. Examples include acrylic resin, urethane resin, polyester resin, vinyl chloride, and Examples include vinyl resins such as vinyl acetate, polyolefin resins such as polyethylene and polypropylene, and various derivatives and copolymers thereof, but are not necessarily limited to these. In addition, various resins may be used singly or as mixtures or composites of two or more. Furthermore, in addition to life imprisonment fillers and organic fillers exemplified by silica, talc, calcium carbonate, waxes, etc. may be added.

The dimensions of each of the ink panels K, C, M, Y, S, and P can be appropriately set, for example, matched to the dimensions of the recording area on the recording medium to which the thermal transfer ink is to be transferred from the thermal transfer medium 1. .

The thermal transfer medium 1 may further have a back coat layer such as a heat resistant layer and a lubricating layer on the side of the support 2 opposite to the ink panels K, C, M, Y, S and P.

(intermediate transfer foil)
The intermediate transfer foil requires at least an image-receiving layer to be transferred from the thermal transfer medium 1, but if necessary, a peeling layer, an anchor layer, a hologram-forming layer, etc. may be laminated. A back coat layer may be formed on the opposite side. As the support, resin films such as polyethylene terephthalate, polyethylene naphthalate, polyimide, polycarbonate, acrylic resin, polypropylene, and triacetyl cellulose can be used.

The image-receiving layer includes, for example, polyester resins such as linear saturated polyester, vinyl chloride diameter resins such as polyvinyl chloride and polyvinyl chloride-vinyl acetate copolymer resin, polyacrylic acid, poly-2-methoxyethyl acrylate, poly Methyl acrylate, polyacrylonitrile, polymethyl chloroacrylate, polymethyl methacrylate, polyethyl methacrylate, polytert-butyl methacrylate, polyisobutyl methacrylate, polyphenyl methacrylate, methyl methacrylate, alkyl methacrylate (however, vinyl diameter resins such as copolymer resins having 2 to 6 carbon atoms in the alkyl group), polystyrene resins, polydivinylbenzene, polyvinylbenzene, styrene-butadiene copolymer resins, urethane resins, epoxy resins, and the like. is not limited to Further, these resins may be used alone or as a composite such as a mixture or laminate of two or more kinds, and various additives such as ultraviolet absorbers and fillers may be added.

The release layer preferably has peelability and foil tearability when heated, and also has a function of preventing chemical and mechanical damage from the outside after being transferred to a transfer target (base material). Examples thereof include thermoplastic acrylic resins, cellulose resins, chlorinated polypropylene resins, etc., but are not necessarily limited to these. Further, these resins may be used alone or as a composite such as a mixture or laminate of two or more kinds, and furthermore, fluororesin powder and polyethylene powder. Animal waxes, plant waxes, fatty alcohol and acid waxes, amine and amide waxes, chlorinated waxes, metal salts of higher fatty acids such as zinc stearate, and other anti-friction agents and inorganic substances are added. good.

The anchor layer can be provided as necessary, for example, it can be provided as an OVD (Optical Variable Device) layer having a security image such as a hologram or a diffraction grating.

(Information recording material excluding transfer foil)
The first protective layer, the laser coloring layer, the core layer, and the second protective layer, which constitute the information recording medium (hereinafter referred to as the information recording medium base material) before the transfer foil is adhered, are made of, for example, vinyl chloride resin or polycarbonate. - Bonate resin, polyester resin such as polyethylene terephthalate, acrylonitrile-butadiene-styrene copolymer resin, acrylic resin, plastic resin made of polyolefin resin such as polypropylene resin, and the like, but are not necessarily limited. In addition, it is preferable that each layer is made of the same base material because the information recording medium becomes more uniform and durable when it is thermocompressed.

Examples of the laser coloring layer include a polycarbonate resin carbonized by irradiation with a laser beam, and a resin similar to the core sheet or protective sheet mixed with a laser coloring agent. As for the thickness of each layer, the thickness of the protective layer is preferably 50 μm to 200 μm, the thickness of the core layer is preferably 50 μm to 600 μm, and the thickness of the laser coloring layer is preferably 20 μm to 200 μm.

Said laser light assumes the use of YAG laser, YVO4 laser (1064 nm) or _CO2 laser (10600 nm).

(Method of creating information recording medium)
FIG. 2 is a diagram schematically showing an example of an indirect transfer recording apparatus that can be used for manufacturing an information recording medium.

The information recording medium according to the embodiment of the present invention can be manufactured using the thermal transfer medium 1 and the thermal transfer printer as described above. FIG. 2 shows an example in which a thermal transfer printer is configured by a primary transfer section 101 which is an indirect transfer type printer.

In the indirect transfer recording apparatus shown in FIG. 2, the thermal transfer medium 1 is unwound from a thermal transfer medium unwinding section 3, and thermal head 5 and platen roller 10 of primary transfer section 101 for performing thermal transfer printing on intermediate transfer foil 6. and then taken up by the thermal transfer medium take-up unit 4 . Further, the intermediate transfer foil 6 is unwound from the unwinding roll 7, passed between the thermal head 5 of the primary transfer portion 101 and the platen roller 10, and then thermally and pressure-transferred onto the recording medium 11 as the transfer target. After passing between the heat roller 9 and the platen roller 10 at the secondary transfer section 102 , the sheet is taken up by the intermediate transfer foil take-up section 8 .

In the primary transfer section 101, from the thermal transfer medium 1 to the intermediate transfer foil 6, a color image or a color image is transferred from ink panels K, C, M and Y of four colors of black, cyan, magenta and yellow onto an overlay layer which is also an image receiving layer of the intermediate transfer foil 6. A pattern such as a character is transferred, and a first security pattern is transferred from the infrared transmissive ink panel S. Further, an adhesive layer is transferred from the primer ink panel P.

The intermediate transfer foil 6 on which each pattern is formed is transported to the secondary transfer section 102 and is thermally pressed onto the information recording medium substrate 11 by the heat roller 9, whereby each pattern formed by the primary transfer section 101 is transferred. It is transferred together with the overlay layer to the information recording medium substrate 11 to form the information recording medium 12 .

In this manner, the patterns of color images, characters, etc., and the glitter patterns can be formed into arbitrary shapes and arrangements by appropriately controlling the operation of the thermal head 5 . Therefore, arbitrary individual information can be recorded on the intermediate transfer foil 6 and on the information recording medium 12 .

Furthermore, although not shown here, the information recording medium 12 is selectively irradiated with a laser beam from the intermediate transfer foil side to form a second security pattern on the laser coloring layer.

(Information recording body)
FIG. 3 is a plan view showing an example of the information recording medium 12 obtained as described above.
In FIG. 3, in the personal information printing area of the information recording medium 12, a first image 13 consisting of a facial photograph image and the first security pattern and the second security pattern, which are also facial photograph images, are superimposed. A second image 14 and a character string 15 consisting of character information such as name, date of birth, personal number, etc. are provided.

FIG. 4 is a cross-sectional view taken along line A-A' in FIG. The first image 13 is formed as a color image by synthesizing the ink panels C, M, and Y, the character string 15 is formed as a monochrome image by the ink panel K, and the overlay 16 formed on the intermediate transfer foil 6 is the first image. A primer layer P is adhesively laminated on one protective layer 21 .

The second image 14 is the first security pattern 14-P1 by the ink panel S on the same layer as the C, M, Y, and K layers, and is formed in the laser coloring sheet 21 by laser engraving. 2 security patterns 14-P2, respectively. The first security pattern 14-P1 and the second security pattern 14-P2 are separated by the sum of the thicknesses of the first protective layer 21 and the core layer 19, h.

The distance h, that is, the distance between the first security pattern 14-P1 and the second security pattern 14-P2 for generating security information as moire, must be equal to or greater than the pattern pitch, preferably 100 μm or greater. As the distance between the first security pattern 14-P1 and the second security pattern 14-P2 increases, the motion of the moiré image becomes more dynamic when the information recording medium 12 is tilted, and visibility improves.

The base material of the information recording medium 12 may be either a transparent base material (transparent plastic card) or only a transparent base material (a window-opening plastic card) where the second image 14 is provided. A symmetrical thickness structure is preferred to reduce warping of the plastic card.

The first security pattern 14-P1 formed by the security panel S becomes one of moire images. The first security pattern 14-P1 may or may not be straight. The pattern pitch of the first security pattern 14-P1 should be narrower than the distance h between the first security pattern 14-P1 and the second security pattern 14-P2. Also, the line pitch of the first security pattern 14-P1 follows the line width, and the line width may be 40 μm or more and 400 μm or less, and the face image is formed by changing the line width.

A laser beam is irradiated from the overlay 16 side of the obtained information recording medium 12, and the laser printed layer 20 is carbonized by the laser beam from above the first security pattern 14-P1 in the second image 14 area (in FIG. 4, L), forming a second security picture 14-P2. At this time, since the first security pattern 14-P1 is formed of the infrared transmissive ink, energy loss of the laser light is small, and reliable laser engraving is possible.

The formed second security pattern 14-P2 becomes another moire image. The second security pattern 14-P2 may or may not be straight. The pattern pitch of the second security pattern 14-P2 should be narrower than the distance between the first security pattern 14-P1 and the second security pattern 14-P2, and is shifted from the first security pattern 14-P1. By forming it at a straight position, the image changes when the information recording medium is tilted. Further, the line pitch of the security pattern 14-P2 follows the line pitch of the first security pattern 14-P1, and the line width of the security pattern 14-P2 is 20 μm or more and less than or equal to the line width of the first security pattern 14-P1. Good if

(Authentication judgment)
FIG. 5 is a cross-sectional view of the information recording medium schematically showing that the second image is different depending on the observation position. A state viewed from the side when viewed from a viewing angle B (oblique) 23 is shown.

FIG. 6 shows a front view of an information recording medium image 24 when authenticated at the viewing angle A (front) obtained by observing at the viewing angle A (front) 22 and an information recording medium image 24 observed at the viewing angle B (oblique) 23 . FIG. 11 is a perspective view of an information recording medium image 26 when authenticated at a viewing angle B (oblique) 23 obtained.

In the information recording medium image 24 viewed from the front at the viewing angle A22, the portion of the second image 14 is observed as a monochrome face image 25, whereas the information recording medium image 26 viewed obliquely at the oblique viewing angle B23. Then, a security effect (moiré) is generated in the portion of the second image 14, and an image 27 in which a latent image of personal information, such as the date of birth, which cannot be observed at the viewing angle A22 is visualized is observed. be.

In this way, the security latent images of the first security pattern 14-P1 and the second security pattern 14-P2 formed by the security panel S, which cannot be observed independently, can be moiré by changing the observation angle of the information recording medium 12. can be made into a visible image 27 that is expressed and observed.

Examples of the present embodiment are shown below.
(Preparation of thermal transfer medium)
A hue panel and a security panel (S ), and the adhesive panel (P) is sequentially formed from a mixed resin in which various pigments are mixed with a polyester resin using a gravure coater. A primer panel (P) of 1.2 μm was used as a thermal transfer medium.

The composition of each ink is as follows.
[Composition of cyan ink]
Cyan pigment 5 parts by weight Byron 500 (Toyobo Co., Ltd.) 15 parts by weight MEK (Toyo Ink Mfg. Co., Ltd.) 80 parts by weight
[Composition of magenta ink]
Magenta pigment 5 parts by weight Byron 500 (Toyobo Co., Ltd.) 15 parts by weight MEK (Toyo Ink Mfg. Co., Ltd.) 80 parts by weight [Composition of yellow ink]
Yellow pigment 5 parts by weight Byron 500 (Toyobo Co., Ltd.) 15 parts by weight MEK (Toyo Ink Mfg. Co., Ltd.) 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 (Toyo Ink Mfg. Co., Ltd.) 80 parts by weight
[Composition of security ink]
Infrared transmission ink Cyan pigment 3 parts by weight
Magenta pigment 3 parts by weight
Yellow pigment 4 parts by weight
Byron 500 (Toyobo Co., Ltd.) 10 parts by weight MEK (Toyo Ink Manufacturing Co., Ltd.) 80 parts by weight
[Composition of primer]
Byron 500 (Toyobo Co., Ltd.) 20 parts by weight MEK (Toyo Ink Manufacturing Co., Ltd.) 80 parts by weight

(Production of intermediate transfer foil)
On one side of a 12 μm polyethylene terephthalate (PET) substrate, an epoxy resin was formed as an overlay layer with a gravure coater to a thickness of 0.8 μm to obtain an intermediate transfer foil 6 . The ink composition of the overlay layer is as follows.
[Ink Composition of Overlay Layer]
jER1003 (Mitsubishi Chemical Co., Ltd.) 20 parts by weight MEK (Toyo Ink Manufacturing Co., Ltd.) 80 parts by weight

(Production of information recording medium)
The information recording medium was produced by the method shown in the above (Method for producing information recording medium) explained with reference to FIG.

The first image 13 is formed with cyan (C), magenta (M), and yellow (Y), which are color material panels, and the character string 15 is formed with black (K). Further, the second image 14 was formed as a first security pattern 14-P1 by the security panel (S) and printed and arranged on the card surface. The first security pattern 14-P1 formed by the security panel (S) becomes one of the moire images. The first security pattern 14-P1 was formed with a parallel line (straight line) image with a line width of 40 μm to 120 μm.

The second image 14 is printed and arranged as a first security pattern 14-P1 on the same layer as each of the images by the security panel (S), and the first security pattern 14-P1 is passed through the laser coloring layer, YVO4 A laser (1064 nm) was used to selectively irradiate a laser beam, and an image having a line width of 40 μm was formed by combining the second security pattern 14-P2 printed and arranged. It was confirmed that the latent image of the character string arranged in the face image was visualized by the contrast of the moire generated by the observation angle.

From the above, it is possible to produce a thermal transfer medium with a new security panel in the same processing process as a normal thermal transfer medium. An information recording body capable of personal authentication was produced.

In particular, since the formation of an image that represents authenticity in authentication is not based on single-layer ink or optical properties, but only by combining information formed on multiple layers, information recording media with extremely high resistance to alteration and counterfeiting can be produced. did it.

REFERENCE SIGNS LIST 1 thermal transfer medium 2 support K black panel C cyan panel M magenta panel Y yellow panel S security panel (infrared transmission ink panel)
P... Primer panel 3... Thermal transfer medium unwinding part 4... Thermal transfer medium winding part 5... Thermal head 6... Intermediate transfer foil 7... Intermediate transfer foil unwinding part 8 ... Intermediate transfer foil winding part 9 ... Heat roll 10 ... Platen roller 11 ... Information recording medium base material 12 ... Information recording medium 13 ... First image 14 ... Second Image 14-P1... First security pattern of second image 14-P2... Second security pattern of second image 15... Character string AA'... Cross section L... Laser coloring (carbonized part)
h... Distance between pattern 1 and pattern 2 16... Overlay 17... Peeling layer 18... Image receiving layer 19... Core sheet 20... Laser printing sheet 21... Protective lamination sheet 22...・Viewing angle A (front)
23 Viewing angle B (oblique)
24 Image of information recording body when authenticated at viewing angle A 25 Image A
26 Image of information recording body when authenticated at viewing angle B 27 Image B
101... primary transfer section 102... secondary transfer section

Claims (5)

In an information recording medium comprising a first protective layer, a laser coloring layer, a core layer, a second protective layer, and an overlay layer, which are each made of a plastic sheet and laminated in this order, the overlay layer is formed on demand with at least an infrared transmitting ink. An image obtained by superimposing the first security pattern and a second security pattern formed on demand on the laser coloring layer by laser engraving, comprising an image-formed first security pattern. , an information recording body capable of displaying different security pattern information depending on the viewing angle. 2. The information recording medium according to claim 1, wherein the security pattern information that differs depending on the viewing angle is visualized by a moire pattern. 3. An information recording medium according to claim 1, wherein said overlay layer is laminated by adhering an intermediate transfer foil containing a pattern formed by a thermal transfer method to said second protective layer. . A thermal transfer medium for forming a pattern by the thermal transfer method, which is used for producing the information recording medium according to any one of claims 1 to 3, wherein black (K) and cyan (C) are used as a coloring material layer. , magenta (M), and yellow (Y) ink panels, a functional (S) ink panel serving as a security layer, and a primer (P) ink panel serving as an adhesive layer. medium. 5. A thermal recording medium according to claim 4, wherein said functional ink is an infrared transmitting ink.

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