JP2015182431A - Authenticity determining forgery prevention display body and manufacturing method thereof and authenticity determining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery prevention display body which is hard to be duplicated and improved in durability.SOLUTION: A forgery prevention display body 1A capable of determining authenticity includes a substrate 2, and an authenticity determining display part 3A provided along the substrate 2. The authenticity determining display part 3A has a fine line part 8a which is extended in a curve line or polygonal line having an uneven line width, and is formed by dense metal atoms. The fine line part 8a forms a finger-print pattern including a striped pattern arranged so as to be in parallel in a wider pitch than the line width of the fine line part 8a.

Description

  The present invention relates to an anti-counterfeit display capable of determining authenticity, a manufacturing method thereof, and an authenticity determining method.

Conventionally, various anti-counterfeiting techniques such as holograms, watermarks, luminescent ink, and latent image patterns have been applied to prevent forgery of, for example, cash vouchers, securities, certification stamps, credit cards, membership cards, and expensive items. .
In recent years, semiconductor components such as microchips have become counterfeit targets. By replacing a microchip incorporated in a communication device or a military device with a counterfeit product, it becomes possible to artificially generate a situation such as leakage of confidential information or a fatal device malfunction. For this reason, it is required to apply anti-counterfeiting technology to very fine parts on the micrometer scale.

  The anti-counterfeiting technology includes an overt type that is visible with the naked eye under natural light, and a covert type that is not visible with the naked eye and can only be confirmed by using a special optical device. Since the covert type is invisible to the naked eye, the covert type is less likely to be noticed that anti-counterfeiting has been applied compared to the overt type, and is less likely to be duplicated or imitated. Therefore, a high anti-counterfeiting effect is expected.

  As an example of the covert type anti-counterfeiting technique, Patent Document 1 proposes a technique using taggant particles that are fine particles having traceable information therein. Taggant particles are known to have letters, numbers, signs, and special colors, and can be identified by magnifying them. Therefore, since the taggant particles themselves are difficult to discriminate and are difficult to duplicate or imitate, the technique of Patent Document 1 is considered to have a high anti-counterfeit effect.

  In addition, as an example of a technique that cannot be visually recognized by the naked eye and difficult to duplicate or imitate due to its high irregularity, Patent Document 2 proposes a technique that uses an irregular ink distribution pattern of transparent ink. Has been. In this technique, a transparent ink that repels the underlying layer is applied to form an ink distribution pattern. Then, an irregularly repelled ink distribution pattern image is measured (read) with a dedicated reader capable of measuring the ink surface temperature distribution at a resolution of 12 dots / mm, and the obtained ink distribution pattern image is uniquely specified in advance. Register as Then, the surface temperature of the determination object is measured by the reader, and the authenticity determination is performed by collating with the registered ink distribution pattern image. This technique is considered to have a high anti-counterfeiting effect due to the invisibility with the naked eye by using transparent ink and the low reproducibility by using “repelling” of ink.

International Publication No. 2012/141212 JP 2012-40834 A

  However, even the anti-counterfeit technology described in Patent Document 1 may be counterfeited. In other words, even if taggant particles are used, if the specific information of the particles is revealed, it can be copied or imitated, and as a result, authenticity determination becomes difficult. Note that Patent Document 1 proposes taggant particles that also have second identification information that cannot be identified at a magnification that allows identification of the first identification information, assuming that the first identification information is duplicated. However, even in this case, if the second identification information is also clarified, it can be duplicated or imitated, and it is still difficult to determine authenticity.

  In addition, since the anti-counterfeiting technique described in Patent Document 2 uses an irregular pattern formed by ink “repelling”, the pattern size and the pattern formation region tend to vary, and the ink pattern size and It is difficult to form an identifiable pattern in a fine area below the resolution. Moreover, even if it is possible to form a pattern that can be identified by a fine area below the ink pattern size or resolution, it is difficult to read an image because an image reader with a resolution of 12 dots / mm is used. It is.

The present invention has been made in view of the above problems, and provides an anti-counterfeit display body capable of authenticity determination that is difficult to duplicate and can improve durability, and a method for manufacturing the same. The purpose is to do.
Another object of the present invention is to provide a true / false determination method capable of preventing erroneous determination by using the anti-counterfeit display body capable of determining authenticity of the present invention.

  In order to solve the above problems, a forgery prevention display body capable of determining authenticity according to the first aspect of the present invention includes a base material, and a display unit for authenticity determination provided along the base material. The display unit for anti-counterfeiting capable of determining authenticity, wherein the display unit for determining authenticity is formed in a curved line shape or a broken line shape having a non-uniform line width, and is formed by densely gathering metal atoms. It has a thin line portion, and the thin line portion forms a fingerprint-like pattern including a stripe pattern arranged in parallel at a pitch wider than the line width.

  In the forgery prevention display body, it is preferable that the pitch of the thin line portions in the striped pattern is 10 nm or more and 100 nm or less.

  In the anti-counterfeit display, an organic polymer capable of self-organizing a periodic phase separation structure is disposed on the base material between the thin line portions, and the fine line in the striped pattern It is preferable that the pitch of the part matches the pitch of the periodic phase separation structure.

  In the forgery prevention display body, it is preferable that the periodic phase separation structure is a cylinder structure or a lamellar structure.

  In the forgery prevention display body, the organic polymer layer thickness is preferably 10 nm or more and 100 nm or less.

  In the forgery prevention display body, it is preferable that the thin line portion is formed of a simple substance of the metal atom attached on the base material or a compound containing the metal atom.

  In the forgery prevention display body, it is preferable that an alignment mark having a certain positional relationship with the fingerprint pattern is formed on the base material in a range where the fingerprint pattern is formed.

  The method for producing an anti-counterfeit display body capable of determining authenticity according to the second aspect of the present invention includes a base material and a display unit for authenticity determination provided along the base material. A method for producing a display for preventing counterfeiting, wherein an organic polymer capable of forming a periodic phase-separated structure in a self-organizing manner is applied on a substrate, and the organic applied on the substrate A microdomain that draws a fingerprint-like pattern that includes a stripe-like pattern that is stretched in parallel with a pitch wider than the line width, while the polymer is heated to extend the line width into a non-uniform curve or polygonal line. Forming a phase-separated structure having a self-organized structure, and selectively introducing metal atoms into the microdomain of the phase-separated structure, whereby the metal atoms are concentrated along the microdomain. Fine A metal atom introduction step for forming a portion, and by executing these steps, a display unit for authenticity determination having the fine line portion for drawing the fingerprint pattern is formed along the base material And

  In the method for producing the counterfeit-preventing display body, after the metal atom introduction step, the organic polymer is removed from the base material, and the thin wire portion made of the metal atom or the compound containing the metal atom is used as the base. It is preferable to carry out an organic polymer removing step for depositing on the material.

  In the method for manufacturing the counterfeit-preventing display body, the pitch of the periodic phase separation structure in the striped pattern is 10 nm to 100 nm, and the layer thickness of the organic polymer is 10 nm to 100 nm. preferable.

  In the method for manufacturing a counterfeit-preventing display body, the periodic phase separation structure is preferably a cylinder structure or a lamella structure.

  In the method for manufacturing the counterfeit-preventing display body, it is preferable to execute an alignment mark forming step in which an alignment mark is formed on the substrate before the coating step.

  An anti-counterfeit display body capable of determining authenticity according to the third aspect of the present invention includes a base material and an anti-counterfeit display capable of determining authenticity provided with a display section for authenticity determination provided along the base material. It is a display body, Comprising: The said authenticity determination display part is set as the structure manufactured using the preparation method of the forgery prevention display body which can perform the said authenticity determination.

  In the authenticity determination method according to the fourth aspect of the present invention, an image of the authenticity determination display part in the authentic product of the anti-counterfeit display is acquired, and the image of the fingerprint pattern read from the acquired image Data is registered as authentic image data of the anti-counterfeit display, and an image of the authenticity display part of the anti-counterfeit display for determination is acquired, and a fingerprint pattern read from the acquired image The image data is compared with the genuine image data registered in advance, thereby determining the authenticity of the determination target.

  In the authenticity determination method, it is preferable that the image of the authenticity determination display unit is acquired by a scanning electron microscope or an atomic force microscope (AFM).

According to the anti-counterfeit display body capable of determining authenticity and the manufacturing method thereof according to the present invention, the line is extended into a curved line or a polygonal line having a non-uniform line width, and metal lines are densely formed into a fingerprint pattern. Since the anti-counterfeit display portion having the portion is formed, it is difficult to duplicate and the durability can be improved.
In addition, according to the authenticity determination method of the present invention, since the determination is performed using the anti-counterfeit display body capable of determining authenticity of the present invention, it is possible to prevent an erroneous determination of authenticity.

FIG. 3 is a schematic enlarged plan view and a schematic enlarged cross-sectional view of a forgery prevention display body according to a first embodiment of the present invention. It is typical process explanatory drawing which shows the manufacturing process of the display body for forgery prevention of the 1st Embodiment of this invention. It is the typical enlarged plan view of the display body for forgery prevention of the 2nd Embodiment of this invention, and typical enlarged sectional drawing. It is typical process explanatory drawing which shows the manufacturing process of the display body for forgery prevention of the 2nd Embodiment of this invention. It is the typical enlarged plan view and the typical expanded sectional view of the display body for forgery prevention of the 3rd Embodiment of this invention. It is typical process explanatory drawing which shows the manufacturing process of the display body for forgery prevention of the 3rd Embodiment of this invention. It is a typical enlarged plan view and a typical expanded sectional view of a display object for forgery prevention of a 4th embodiment of the present invention. It is typical process explanatory drawing which shows the manufacturing process of the display body for forgery prevention of the 4th Embodiment of this invention. It is an example of the image of the anti-counterfeit display body containing the organic polymer layer and the image of the anti-counterfeit display body from which the organic polymer layer is removed, acquired in the phase mode of the scanning electron microscope. It is an example of the image of the display object for forgery prevention containing the organic polymer layer acquired in the phase mode of AFM, and the example of the image of the display body for forgery prevention which removed the organic polymer layer.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
An anti-counterfeit display body according to a first embodiment of the present invention will be described.
1A and 1B are a schematic enlarged plan view and a schematic enlarged cross-sectional view of a counterfeit-preventing display body according to a first embodiment of the present invention.
1 (a) and 1 (b) are schematic diagrams, the shape and dimensions are exaggerated (other than the following FIG. 9 (a), (b), FIG. 10 (a), and (b)). The same applies to the drawings.

A counterfeit prevention display 1A shown in FIGS. 1A and 1B is configured to be able to determine authenticity as will be described later. For this reason, the counterfeit prevention display body 1A is formed or fixed to an anti-counterfeit object such as, for example, a cash voucher, securities, certification stamp, credit card, membership card, expensive article, or very fine semiconductor-related parts. Therefore, it can be used for authenticity determination.
An anti-counterfeit display body 1A according to the present embodiment includes a base material 2 and a display unit for authenticity determination 3A provided along one surface 2a of the base material 2.

The material of the base material 2 is not particularly limited as long as the authenticity determination display portion 3A can be provided on the surface, and the material can be appropriately selected according to the purpose.
Examples of suitable materials for the substrate 2 include film substrates such as PET (polyethylene terephthalate), PETG (polyethylene terephthalate copolymer), PVC (polyvinyl chloride), glass, silicon wafers, ITO (oxidized). Indium tin).
In addition, the base material 2 may be provided separately from the forgery prevention target object and bonded to the forgery prevention target object, or a part of the forgery prevention target object may be used as the base material 2.
In particular, when glass, silicon wafer, ITO, or the like is used as the base material 2, the base material 2 may be a member that constitutes a part of an electronic component or an optical component that is a forgery prevention target.

In addition, although Fig.1 (a) and (b) depict the base material 2 like a sheet-like member as an example for a schematic diagram, the base material 2 is not in a plate-like member or a sheet-like member. It is not limited. Further, the surface of the substrate 2 may be a flat surface or a curved surface.
Further, in FIG. 1A, the base material 2 is drawn as if it has the same dimensions as the authenticity determination display unit 3A in plan view, but the base material 2 is displayed as the authenticity determination display unit. It is also possible to provide in a range wider than 3A.

The shape of the region where the authenticity determination display unit 3A is formed is not particularly limited, but in the present embodiment, a rectangular region is adopted as an example.
The size of the authenticity determination display unit 3A depends on the size of the forgery prevention object. For example, in the case of a rectangular region, the length of one side is a square or a rectangle of 0.5 μm to 100 μm. It is more preferable that the length of one side is a square or a rectangle of 0.5 μm to 10 μm.
Further, in the case of a shape other than a rectangle, it is preferable that the size includes a rectangular region having such a size on the inside.

In the base material 2, an alignment mark 4 (see FIG. 1A, not shown in FIG. 1B) is formed on the surface 2a in a range where the authenticity determination display portion 3A is provided.
As will be described later, the alignment mark 4 is a part for determining the position and image acquisition range of the display unit for authenticity determination 3A when acquiring the image of the display unit for authenticity determination 3A and performing the authenticity determination. It is. For this reason, any shape may be used as long as the mark can be read by the image acquisition unit of the authenticity determination display unit 3A described later. For example, shapes such as a cross, a circle, and a rectangle can be given.
Further, the number of alignment marks 4 is not particularly limited.

The alignment mark 4 can be configured by, for example, a concave portion or a convex portion having an appropriate shape in plan view, or a combination of the concave portion and the convex portion.
When the alignment mark 4 is formed as a recess, it can be formed by, for example, appropriate etching according to the material of the substrate 2.
In the case where the alignment mark 4 is formed as a convex portion, for example, an appropriate material can be formed on the substrate 2 by an inkjet method or the like.
The height difference of the alignment mark 4 with respect to the base material 2 is a size that can be followed by a display unit for authenticity determination 3A, which will be described later, and substantially corresponds to the unevenness of the alignment mark 4 on the surface of the display unit for authenticity determination 3A. If it is a magnitude | size in which the same unevenness | corrugation is formed, it will not specifically limit. That is, an appropriate height difference that allows the position of the alignment mark 4 to be identified via the authenticity determination display unit 3A is possible by an image acquisition unit of the authenticity determination display unit 3A described later.
For example, the height difference of the alignment mark 4 with respect to the base material 2 is preferably 2 to 10 times the thickness of the authenticity determination display portion 3A.
When the alignment mark 4 has a linear part in plan view, the line width is not particularly limited, but is preferably 10 nm to 100 nm, for example.

In the present embodiment, as an example, the alignment mark 4 employs a cross-shaped concave portion having a crossing center at a position separated on one diagonal line of the rectangular region where the authenticity determination display portion 3A is formed. In this alignment mark 4, the cross-shaped linear portions are extended in parallel with the outer shape of the authenticity determination display portion 3 </ b> A.
By forming the alignment mark 4 in two places in this way, the dimension (size, length) of the pattern can be confirmed from these intervals, and the directionality can also be confirmed. .

  The authenticity determination display section 3A is a portion that can be determined authenticity by having a unique pattern, and in the present embodiment, includes a continuous phase 6 and a thin line portion 8a.

The continuous phase 6 is a layered portion provided so as to cover the base material 2 in the region where the authenticity determination display portion 3A is formed, and is formed of an organic polymer.
The layer thickness of the continuous phase 6 is preferably 10 nm or more and 100 nm or less, and more preferably 30 nm or more and 50 nm or less.

The thin line portion 8a is a linear portion formed on the surface of the continuous phase 6 so as to extend in a curved line shape or a broken line shape having a non-uniform line width and densely gather metal atoms.
In the present embodiment, the metal atoms of the thin wire portion 8a are introduced into an organic polymer that constitutes a microdomain having a cylinder structure that is phase-separated with respect to the organic polymer of the continuous phase 6, and are concentrated along the microdomain. ing.
The metal atoms in the thin line portion 8a are arranged so that the image of the authenticity determination display portion 3A can be clearly obtained.
For this reason, the metal atoms may be densely packed with simple metal atoms, or may be densely packed with a metal atom compound. As the metal atom compound, for example, metal oxides and metal hydroxides are suitable.
Further, the metal group or the atomic group containing the metal atom may be densely charged, that is, in an ionic state.
Further, the type of metal atom is not particularly limited, but, for example, Au (gold), Pt (platinum), Pd (palladium), Fe (iron), Cu (copper), Ni (nickel) and the like are preferably employed. be able to.

Thus, when metal atoms are densely packed in the thin wire portion 8a, for example, when the image acquisition means is a scanning electron microscope, secondary electrons increase in the thin wire portion 8a where the metal atoms are densely packed. For this reason, the contrast with the continuous phase 6 made of an organic polymer is increased, and a clear image can be obtained.
Further, for example, when the image acquisition means is an AFM (atomic force microscope), the portion where the metal atoms are concentrated in the thin wire portion 8a and the continuous phase 6 have viscoelasticity, adsorptivity, and the like. Since a difference occurs, a clear image can be acquired.

The shape of the thin line portion 8a in plan view is a fingerprint pattern including a striped pattern arranged in parallel at a pitch wider than the line width of the thin line portion 8a.
As shown to Fig.1 (a), each striped pattern can be joined to the other fine wire part 8a, or can be branched from the other fine wire part 8a. The striped pattern can be swirled, meandered, or bent.
Such a fingerprint-like pattern of the thin line portion 8a has a non-uniform line width and the complexity of each striped pattern itself, as well as the size, shape, and arrangement of the line width and each striped pattern. Is produced in a shape that cannot be repeatedly reproduced even under the same production conditions. That is, the authenticity determination display unit 3A is difficult to duplicate in that the same product cannot be produced.
For this reason, the fingerprint pattern for each authenticity determination display section 3A is a unique pattern.

The fingerprint-like pattern formed by the thin line portion 8a can be set to an appropriate numerical value for the line width of the thin line portion 8a and the pitch of the fine line portion 8a in the stripe pattern so that the pattern cannot be duplicated by a lithography technique or the like. It is preferable to make it into a range.
For example, the line width of the thin line portion 8a is preferably 2 nm or more and 50 nm or less.
In addition, the pitch of the parallel fine line portions 8a in each striped pattern by the fine line portions 8a is preferably 10 nm or more and 100 nm or less, and more preferably 10 nm or more and 50 nm or less.
In addition, the pitch of the thin line part 8a shall acquire the image of the thin line part 8a, and shall measure it with the space | interval of the centerline of the thin line part 8a. However, since the pitch of the thin line portion 8a varies depending on the location, measurement is performed by sampling a plurality of striped patterns at a plurality of locations.

If the line width of the thin line portion 8a is in the range of less than 2 nm, a clear image cannot be acquired in the authenticity determination described later, and the accuracy of the authenticity determination is lowered. Further, the durability of the thin wire portion 8a is deteriorated.
If the line width of the thin line portion 8a is in a range exceeding 50 nm, the line width may be reproduced and reproduced as a pattern depending on the line width, which is not preferable.
If the pitch of the thin line portions 8a is in the range of less than 10 nm, it becomes difficult to form a stable continuous phase 6, and even if it can be formed, the striped pattern is aged over time as compared with the case of a line width of 10 nm or more. May change easily.
If the pitch of the thin line portions 8a is in a range exceeding 100 nm, the pitch may be reproduced and reproduced as a pattern depending on the pitch, which is not preferable.

A method for producing the anti-counterfeit display 1A having such a configuration will be described.
2A, 2B, 2C, and 2D are schematic process explanatory views showing the manufacturing process of the counterfeit-preventing display body according to the first embodiment of the present invention.

  In order to produce the counterfeit-preventing display 1A, an alignment mark formation step, a coating step, a pattern formation step, and a metal atom introduction step are performed in this order.

The alignment mark forming step is a step of forming the alignment mark 4 on the surface of the substrate 2.
For example, when the substrate 2 is a silicon wafer, a cross-shaped alignment mark 4 as shown in FIG. 1A can be formed as a recess on the substrate 2 by, for example, photolithography. it can.

Next, as shown in FIG. 2A, a coating process is performed. This step is a step of applying the organic polymer 7A capable of forming a periodic phase separation structure in a self-organizing manner onto the base material 2 on which the alignment mark 4 is formed.
As the organic polymer 7A, an organic polymer in which a nanometer-scale periodic pattern is self-organized and a phase separation structure is formed and then metal atoms can be introduced into the microdomains is employed.
As such an organic polymer 7A, a block copolymer formed by bonding two or more different polymer components having low compatibility with each other at the terminal is preferably used.

Depending on the polymer chain length in such a microscopic region, such a block copolymer may be subjected to annealing treatment (heating treatment) at a temperature higher than the glass transition temperature of the copolymer so that polymer components having low compatibility do not cross each other. A periodic phase separation structure is formed in a self-organizing manner.
Here, “periodic phase separation structure” means that it is periodic when partially viewed. Since the partial periodic structure as a whole is a combined structure without having regularity such as a period, for example, it is an irregular structure as a whole.
Therefore, an irregular self-organization pattern composed of a periodic phase separation structure formed by the self-organization phenomenon in this way is exactly the same even when produced under the same conditions using the same organic polymer. The pattern cannot be reproduced.
Further, since the pattern size is very fine, it cannot be visually recognized by the naked eye, and further, it is a pattern that is difficult to duplicate even by using a very expensive process such as a lithography technique.
In this way, since the self-organized pattern cannot reproduce the exact same pattern even when the same organic polymer 7A is used, there are two or more same patterns as in the human fingerprint pattern. It becomes a pattern.

  As the block copolymer, a copolymer in which each block is connected in series, a star-type block copolymer in which each block is connected at one point, etc. are known, and any block copolymer can be used. it can. However, in this embodiment, in particular, a diblock copolymer in which two different polymer components are bonded at the ends is more preferably used.

The fine structure formed by phase separation of such a diblock copolymer (microphase separation structure) is a sphere (spherical) structure, a cylinder (columnar) structure, depending on the volume ratio of each polymer constituting the block copolymer, It changes variously with gyroidal structure and lamellar (plate-like) structure. The relationship between the phase separation structure of this block copolymer and the volume fraction of the polymer is known from the phase diagram expressed by the Flory-Haggins interaction parameter χ, the degree of polymerization N of the polymer, and the volume fraction of the polymer component. Yes.
In the present embodiment, a block copolymer having a volume ratio of polymer components capable of forming a cylinder structure is used.
The repeated pattern size (periodic pattern size) of the microphase-separated structure depends on the molecular weight of the diblock copolymer. Therefore, by appropriately selecting the molecular weight of the diblock copolymer, the size of the periodic pattern, that is, the size of the periodic phase separation structure can be adjusted to the target size.

  The diblock copolymer used for the organic polymer 7A is not particularly limited. For example, polystyrene-polylactic acid, polystyrene-poly-2-vinylpyridine, polystyrene-poly-4-vinylpyridine, polystyrene-polydimethylsiloxane, polystyrene -Poly-N, N-dimethylacrylamide, polybutadiene-poly-4-vinylpyridine, polystyrene-polyferrocenyldimethylsilane, polybutadiene-polymethyl methacrylate, polybutadiene-poly-t-butyl methacrylate, polybutadiene-poly-t-butyl acrylate , Polybutadiene-polydimethylsiloxane, poly-t-butyl methacrylate-poly-4-vinylpyridine, polyethylene-polymethyl methacrylate, poly-t-butyl methacrylate-poly-2-vinylpyri Polyethylene-poly-2-vinylpyridine, polyethylene-poly-4-vinylpyridine, polyisoprene-poly-2-vinylpyridine, polymethyl methacrylate-polystyrene, poly-t-butyl methacrylate-polystyrene, polymethyl acrylate-polystyrene , Polybutadiene-polystyrene, polyisoprene-polystyrene, polybutadiene-sodium polyacrylate, polybutadiene-polyethylene oxide, poly-t-butyl methacrylate-polyethylene oxide, polystyrene-polyacrylic acid, polystyrene-polymethacrylic acid, and the like.

In addition, the self-organization of the block copolymer is induced by annealing (heating) above the phase transition temperature, but as the molecular weight of the block copolymer increases, the phase separation behavior becomes dull and the microphase It becomes difficult to form a separation structure.
Generally, in order to form a microphase separation structure having a spatial period exceeding 100 nm (hereinafter simply referred to as a period), an extremely long annealing process (heating process) is required.
Moreover, since the period of this micro phase separation structure prescribes | regulates the pitch of the thin wire | line part 8a, it is preferable that it is not too small.
For this reason, as the organic polymer 7A, it is preferable to use an organic polymer having a molecular weight in which the period of the microphase separation structure is 10 nm to 100 nm.

In order to perform the coating process of this embodiment with such an organic polymer 7A, a coating solution diluted with a good solvent is prepared for both polymers constituting the diblock copolymer.
And this coating liquid is apply | coated to the surface 2a of the base material 2 by well-known methods, such as a spin coat method, a bar coat method, a spray coat method, a cast method, for example.
Thereby, as shown in FIG.2 (b), the organic polymer layer 17A is formed.
Thus, the coating process is completed.

The layer thickness of the organic polymer layer 17A in the coating step coincides with the period of the microphase separation structure so that the self-organized microphase separation structure is uniformly formed on the substrate 2. Preferably it is. However, since the period of the actual microphase separation structure varies somewhat, it is sufficient that they coincide within a range of 5% or less of the average period.
The layer thickness of the organic polymer layer 17A after the formation of the microphase separation in the next step takes a discrete value that matches the period of the microphase separation. Therefore, when the film thickness of the organic polymer layer 17A when forming the film does not match the period of the microphase separation structure, the organic polymer layer 17A has a region having a different period depending on the location, resulting in a step. become.
Therefore, it is preferable to match the layer thickness of the organic polymer layer 17A in the coating step with the period of the microphase separation structure. Thereby, when reading the pattern of the thin wire | line part 8a formed on the organic polymer layer 17A, it can prevent making an error.

Next, a pattern formation process is performed. In this step, the organic polymer 7A applied on the substrate 2 is heated to extend the line width into a non-uniform curve shape or a broken line shape, and to arrange in parallel at a pitch wider than the line width. This is a step of forming a phase separation structure having a microdomain describing a fingerprint-like pattern including a striped pattern in a self-organized manner.
That is, the organic polymer layer 17A is annealed (heated) at a temperature equal to or higher than the phase transition temperature of each block copolymer as the component, and then cooled to return to room temperature.
Thereby, self-organization proceeds, and the organic polymer layer 17A becomes an organic polymer layer 17A ′ in which a microphase separation structure is formed, as shown in FIG. 2B.
In the present embodiment, the microphase separation structure of the organic polymer layer 17A ′ is a microphase separation structure including a cylinder domain 5a having a cylinder structure as a microdomain and a continuous layer 6.
The cylinder domain 5a formed here has a periodic structure partially due to self-organization, and has a structure in which such periodic structures are irregularly combined as a whole. As shown in FIG. 1A, the pattern is substantially the same (including the same case) as the fingerprint pattern of the thin line portion 8a.

  Some polymers constituting the block copolymer may undergo crosslinking or decomposition due to the presence of oxygen in the annealing atmosphere. Therefore, the annealing process in this step is preferably performed in a vacuum or in an inert atmosphere (for example, in an atmosphere of nitrogen or argon).

As shown in FIG. 2B, the cylinder domain 5a formed in this way is surrounded by the continuous phase 6 and buried in the organic polymer layer 17A ′, and on the surface of the organic polymer layer 17A ′. Not exposed.
Therefore, next, the cylinder domain 5a is exposed on the surface of the organic polymer layer 17A ′.

  As a method of exposing the cylinder domain 5a on the surface of the organic polymer layer 17A ′, a method of removing the surface layer of the organic polymer layer 17A ′ by a thickness corresponding to half of the period of the microphase separation structure, or the cylinder domain 5a For example, a solvent may be selectively introduced to swell the cylinder domain 5a to rupture the portion of the continuous phase 6 covering the cylinder domain 5a to expose the cylinder domain 5a.

  As a method for removing the organic polymer layer 17A 'by a half-cycle thickness, for example, a dry etching method such as oxygen plasma etching, argon cluster etching, reactive ion etching, or the like can be used.

As a method of selectively introducing a solvent into the cylinder domain 5a and exposing it by swelling, the polymer component that forms the cylinder domain 5a is a good solvent and the polymer component that forms the continuous layer 6 On the other hand, a method of immersing the organic polymer layer 17A ′ in a solvent that becomes a poor solvent can be mentioned.
Thereby, a solvent can be selectively introduced into the cylinder domain 5a. As a result, the cylinder domain 5a introduced with the solvent swells to expand its volume, and the continuous phase 6 on the surface of the organic polymer layer 17A ′ is ruptured to expose the cylinder domain 5a.

By any one of these methods, as shown in FIG. 2C, an organic polymer layer 17A ″ in which the cylinder domain 5a is exposed on the surface is obtained. Between the cylinder domains 5a parallel to each other and between the cylinder domains 5a and the base material 2, the continuous phase 6 is in a state of being arranged.
Although illustration of the shape of the cylinder domain 5a exposed on the surface in plan view is omitted, for example, the pattern is substantially the same (including the same case) as the fingerprint-like pattern of the thin line portion 8a as shown in FIG. ing.
Thus, the pattern forming process is completed.

Next, a metal atom introduction step is performed. This step is a step of forming fine wire portions 8a in which metal atoms are densely arranged along the cylinder domain 5a by selectively introducing metal atoms into the cylinder domain 5a of the phase separation structure.
As a method for introducing metal atoms into the cylinder domain 5a, for example, an electroless plating method, a sol-gel method, a chemical modification method, or the like can be employed.
Since the cylinder domain 5a is electrically insulated from the base material 2 by sandwiching the continuous phase 6 with the base material 2, the electroplating method and the electrolytic deposition method are used in this embodiment. It is not possible.
However, as will be described later, when the microdomain has a lamellar structure extending from the base material 2 and can be electrically connected to the base material 2 and the base material 2 is made of a material that can be used as an electrode, the electroplating is performed. It is also possible to use a method or an electrolytic deposition method.

For example, in order to perform this step by electroless plating, a solvent that is a good solvent for the polymer component that forms the cylinder domain 5a and a poor solvent for the polymer component that forms the continuous layer 6 Next, a plating solvent in which a component (electroless plating catalyst) serving as a catalyst for electroless plating is dissolved is prepared.
Next, the organic polymer layer 17A ″ is immersed in this plating solvent. Thereby, an electroless plating catalyst is selectively introduced into the cylinder domain 5a. Thereafter, the metal is introduced into the cylinder domain 5a by immersing the organic polymer layer 17A '' in an electroless plating bath containing a target metal for electroless plating.
Thus, according to the electroless plating method described above, single atoms of metal atoms are introduced into the cylinder domain 5a by the action of the electroless plating catalyst selectively introduced into the cylinder domain 5a, and the metal atoms are concentrated. A part is formed in the cylinder domain 5a.
As a result, as shown in FIG. 2D, a thin line portion 8a is formed along the cylinder domain 5a.

Moreover, when performing this process by sol-gel method, a metal atom is introduce | transduced as a metal oxide. Therefore, it is a good solvent for the polymer component that forms the cylinder domain 5a, and a sol that is a precursor of a metal oxide prepared with a solvent that is a poor solvent for the polymer component that forms the continuous layer 6. The organic polymer layer 17A ″ is immersed in the substrate.
Thereafter, after the gelation reaction for forming a metal oxide is advanced, the organic polymer layer 17A ″ is taken out from the gel solution, washed with a solvent and dried, so that an oxide of a metal atom is selectively added to the cylinder domain 5a. be introduced.
Thus, according to the sol-gel method described above, oxides of metal atoms are introduced into the cylinder domain 5a, and dense portions of metal atoms are formed in the cylinder domain 5a.
As a result, as shown in FIG. 2D, a thin line portion 8a is formed along the cylinder domain 5a.

Moreover, when performing this process by a chemical modification method, as an organic polymer 7A apply | coated by an application | coating process, as a polymer component which forms the cylinder domain 5a, for example, poly-4-vinyl pyridine or poly-2-vinyl A polymer having a metal coordinating functional group such as pyridine is used. When the cylinder domain 5a is formed of such an organic polymer, metal ions can be selectively coordinated to the cylinder domain 5a.
Therefore, in this step, a solution containing metal atom ions forming the thin wire portion 8a is prepared, and the organic polymer layer 17A ″ is immersed in this solution to coordinate the metal ions to the cylinder domain 5a. As a result, metal atoms are introduced into the cylinder domain 5a in the form of ions.
Thereafter, the organic polymer layer 17A ″ is subjected to a reduction treatment to deposit metal in the cylinder domain 5a.
In this way, according to the chemical modification method described above, the metal ion selectively coordinated to the cylinder domain 5a is reduced, so that a single metal atom is introduced into the cylinder domain 5a, and the metal atom Are formed in the cylinder domain 5a.
As a result, as shown in FIG. 2D, a thin line portion 8a is formed along the cylinder domain 5a.

When this step is performed by a chemical modification method, metal ions are coordinated in the cylinder domain 5a, and then immersed in a basic aqueous solution to precipitate metal atom hydroxides in the cylinder domain 5a. It is possible.
A solution containing metal atom ions forming the thin wire portion 8a is prepared, and the organic polymer layer 17A ″ is immersed in this solution to coordinate metal ions to the cylinder domain 5a. As a result, metal atoms are introduced into the cylinder domain 5a in the form of ions.
Thereafter, by immersing the organic polymer layer 17A '' in a basic solution, it is possible to deposit a metal atom hydroxide in the cylinder domain 5a depending on the solubility product of the metal atom hydroxide. Become.
In this way, according to the chemical modification method described above, metal ions selectively coordinated to the cylinder domain 5a are converted into hydroxides, whereby metal atom hydroxides are introduced into the cylinder domains 5a. Thus, a dense portion of metal atoms is formed in the cylinder domain 5a.
As a result, as shown in FIG. 2D, a thin line portion 8a is formed along the cylinder domain 5a.

When a metal atom is introduced into the cylinder domain 5a by any of the methods exemplified above, this step is completed.
Thereby, the forgery prevention display body 1A in which the authenticity determination display portion 3A including the thin line portion 8a for forming the fingerprint pattern as shown in FIGS. 1A and 1B is obtained.

Next, the authenticity determination method of the present embodiment using the counterfeit prevention display 1A will be described.
In the authenticity determination method of the present embodiment, first, an image of the authenticity determination display unit 3A in the authentic product of the anti-counterfeit display 1A is acquired, and a fingerprint pattern by the thin line portion 8a read from the acquired image is obtained. The image data is registered as authentic image data of the forgery prevention display 1A.

The fingerprint pattern by the thin line portion 8a has a narrow line width, and the pitch of the fine line portions 8a in the striped pattern is also narrow, so that high resolution is required. For this reason, as an image acquisition means, it is preferable to use a scanning electron microscope, AFM, etc., for example.
However, the image acquisition means is not limited to this as long as the image of the fingerprint pattern on the display unit 3A for authenticity determination and the image corresponding to the alignment mark 4 can be acquired.

The thin wire portion 8a contains a metal atom and contains an inorganic component different from the continuous phase 6 made of an organic polymer.
For this reason, in a scanning electron microscope, a clear image can be acquired by, for example, a secondary electron detection mode or a backscattered electron detection mode, or a combination mode thereof. Further, in the AFM, for example, a clear image can be acquired by the phase mode.
An image acquisition range (hereinafter referred to as a verification range) to be used for verification is set in advance with reference to the position of the alignment mark 4.
The position of the alignment mark 4 is formed on the authenticity determination display portion 3A so as to have an uneven shape corresponding to the unevenness of the alignment mark 4, so that the position of the step portion appears in the image. For this reason, an accurate position can be specified by appropriate image processing.

The collation range can be specified by measurement parameters of the image acquisition means (for example, measurement magnification, measurement range, etc.).
The size of the collation range can be determined to an appropriate size according to the measurement limit of the image acquisition means to be used, the shape of the fingerprint pattern of the authenticity determination display unit 3A, and the like.
For example, when the image acquisition unit is a scanning electron microscope and the pitch of the thin line portions 8a is in the above-described preferable range, and the verification range is a square, the verification range is preferably 0.5 nm square to 100 nm square. is there.

When the position of the alignment mark 4 can be identified, an image in the collation range is acquired by the image reading means, and this is used as genuine image data.
The genuine image data is stored in a suitable storage device in a database so that it can be read out when authenticity determination is necessary.
At that time, together with the authentic image data, the reading conditions of the image acquisition means, the manufacturing information of the authenticity determination display unit 3A, and the conditions of the collation range are also stored so as to serve as a reference for setting / determination of authenticity determination. It is preferable to keep it.
In the case of a scanning electron microscope, examples of reading conditions include reading conditions such as measurement mode, measurement magnification, and acceleration voltage. In the case of AFM, reading conditions such as operation frequency and measurement range can be listed.
The manufacturing information of the authenticity determination display unit 3A includes, for example, the pattern period of the fingerprint pattern (pitch of the fine line part 8a in the striped pattern), information on the material and composition of the organic polymer 7A used, and the fine line part 8a. Information on metal species and the like can be given.

Next, the authenticity determination of the forgery prevention display body 1A to be determined is performed.
First, in the same manner as when the genuine image data is acquired, the image data in the verification range of the authenticity determination display unit 3A in the determination target forgery prevention display body 1A is acquired. That is, the position of the alignment mark 4 is identified, and an image in the collation range based on the position of the alignment mark 4 is acquired under the same reading conditions.

Next, this image data and the genuine image data are collated. Here, it is only necessary to compare the fingerprint-like patterns with each other. The collation method is not particularly limited, and a known appropriate image comparison method can be employed.
When the determination target image and the authentic image data match except for errors caused by reading errors and calculation errors, it is determined as “genuine product”, and when they do not match, it is determined as “counterfeit product”.
In this way, the authenticity determination can be performed for the forgery prevention display body 1A to be determined.

Even if the same organic polymer is used for the fingerprint pattern in the authenticity determination display section 3A, the exact same pattern cannot be reproduced, and the pattern size is very fine and cannot be visually recognized by the naked eye. is there.
Therefore, it is difficult to recognize that the anti-counterfeiting process is performed in the first place. In addition, since the fingerprint pattern in the authenticity determination display unit 3A is difficult to duplicate even by using a very expensive process such as a lithography technique, a high forgery prevention effect can be exhibited.
If there is a suspicion that pattern duplication has been attempted by any means, it will not be duplicated at least by self-organization. Therefore, the material corresponding to the portion corresponding to the continuous phase 6 or the portion corresponding to the thin wire portion 8a is used. It is also effective in determining authenticity whether or not the same component is analyzed.

In the anti-counterfeit display 1A of the present embodiment, metal atoms are concentrated in the thin wire portion 8a in the form of, for example, a single metal atom or a metal inorganic compound in the thin wire portion 8a forming the fingerprint pattern.
For this reason, compared with the case where the fingerprint-like pattern is formed only by the cylinder domain 5a, higher durability and weather resistance with respect to heat, light, and a solvent can be provided.
As a result, since the fingerprint-like pattern is less likely to change with time, missing, deformed, and worn due to the use of the determination target product, reading errors due to damage or deterioration of the pattern structure during image reading can be prevented.

  According to the authenticity determination method of the present embodiment, the determination is performed using the anti-counterfeit display 1A of the present embodiment, so that erroneous determination can be prevented.

[Second Embodiment]
Next, a forgery prevention display body according to a second embodiment of the present invention will be described.
3A and 3B are a schematic enlarged plan view and a schematic enlarged cross-sectional view of a counterfeit-preventing display body according to a second embodiment of the present invention.

As shown in FIGS. 3A and 3B, the forgery prevention display body 1B of the present embodiment is replaced with the authenticity determination display section 3A of the forgery prevention display body 1A of the first embodiment. , A display unit 3B for authenticity determination is provided.
Hereinafter, a description will be given centering on differences from the first embodiment.

The authenticity determination display unit 3B deletes the continuous phase 6 from the authenticity determination display unit 3A, and the fine line portion 8b that forms the same fingerprint pattern as the fine line portion 8a in the first embodiment has a base material 2 is directly attached to the surface 2a of 2.
The thin line portion 8b is made of a single metal atom similar to that in the first embodiment or a compound containing a metal atom. As the compound containing a metal atom, a metal oxide or a metal hydroxide is preferable.

Next, a method for producing the forgery prevention display body 1B of the present embodiment will be described.
FIG. 4 is a schematic process explanatory view showing the manufacturing process of the counterfeit prevention display body of the second embodiment of the present invention.

  In order to produce the forgery prevention display body 1B, first, the alignment mark forming process, the coating process, the pattern forming process, and the metal atom introduction process in the method for producing the forgery prevention display body of the first embodiment are similarly performed. The counterfeit prevention display body 1A is manufactured.

  Next, an organic polymer removal step is performed. In this step, the continuous phase 6 made of the organic polymer 7A and the cylinder domain 5a are removed from the substrate 2, and a thin wire portion 8b made of a metal atom or a compound containing a metal atom is attached to the surface 2a of the substrate 2. It is a process.

As a method for removing the continuous phase 6 and the cylinder domain 5a, for example, dry etching such as oxygen plasma etching, argon cluster etching, and reactive ion etching can be used.
At this time, for example, in the case of oxygen plasma etching, the etching conditions are set such that only the component of the organic polymer 7A is selectively removed at a chamber pressure of 10 Pa, an RF bias of 250 W, and an oxygen flow rate of 12 sccm.

When etching is performed in this manner, the continuous phase 6 made of the organic polymer 7A and the cylinder domain 5a are removed, and a metal atom introduced into the cylinder domain 5a or a compound containing a metal atom is deposited on the surface 2a. Then, the thin wire portion 8b having the same pattern shape as the thin wire portion 8a is formed.
Further, in the forgery prevention display body 1A, even when a charged metal atom or a charged atomic group containing a metal atom is introduced, a metal atom or a compound containing a metal atom is gradually obtained by transferring charges in an etching atmosphere. In the same manner, the thin line portion 8b is formed.
Since the surface 2a to which the fine line portion 8b adheres is in a surface activated state by being etched, the fine line portion 8b adheres firmly to the surface 2a and the position is fixed.

As for the line width of the thin line portion 8b formed in this way and the pitch in the striped pattern, dimensions derived from the conditions for self-organization of the organic polymer 7A are preserved.
Therefore, although etching is used, the dimensions are much finer than when a similar material containing metal atoms is etched to form a line.

In this way, when the organic polymer 7A is removed from the surface 2a and the fine line portion 8b adheres to the surface 2a, as shown in FIG. 4, the authenticity determination display portion 3B composed of the fine line portion 8b is formed. .
Thereby, an organic polymer removal process is complete | finished and the display body 1B for forgery prevention is produced.

  Such an anti-counterfeit display 1B can be used in the authenticity determination method of the first embodiment, similarly to the anti-counterfeit display 1A of the first embodiment.

The counterfeit prevention display body 1B according to the present embodiment includes the authenticity determination display unit 3B having a unique pattern that is difficult to duplicate, exactly the same as the fingerprint-like pattern according to the first embodiment. Similar to the embodiment, duplication is difficult and durability can be improved.
In particular, in the present embodiment, the authenticity determination display unit 3B does not include the organic polymer 7A, which is inferior in durability compared to the thin line portion 8b, so that the durability can be further improved.

[Third Embodiment]
Next, a forgery prevention display body according to a third embodiment of the present invention will be described.
FIGS. 5A and 5B are a schematic enlarged plan view and a schematic enlarged cross-sectional view of a counterfeit-preventing display body according to a third embodiment of the present invention.

As shown in FIGS. 5A and 5B, the counterfeit prevention display body 1C of the present embodiment is replaced with the authenticity determination display portion 3A of the counterfeit prevention display body 1A of the first embodiment. , A display unit 3C for authenticity determination is provided.
Hereinafter, a description will be given centering on differences from the first embodiment.

The authenticity determination display unit 3C includes a thin line portion 8c instead of the thin line portion 8a of the authenticity determination display unit 3A.
The fine wire portion 8c is a portion in which metal atoms similar to the fine wire portion 8a are densely formed in a plate-like region penetrating the layer thickness of the continuous phase 6 from the position of the surface 2a. The width is extended in the shape of a curve or a broken line with a non-uniform width.
The shape of the thin line portion 8c in plan view is a unique fingerprint pattern having a striped pattern, as in the first embodiment.
In the present embodiment, the metal atoms of the thin wire portion 8c are introduced into an organic polymer that constitutes a microdomain having a lamellar structure phase-separated with respect to the organic polymer of the continuous phase 6, and are concentrated along the microdomain. ing.

  The preferred range of the line width (hereinafter simply referred to as line width) of the fine wire portion 8c and the pitch of the fine wire portion 8c in the striped pattern is the same as the line width and pitch of the fine wire portion 8a of the first embodiment. is there.

A method for producing the counterfeit prevention display body 1C having such a configuration will be described.
6 (a), 6 (b), and 6 (c) are schematic process explanatory views showing the manufacturing process of the counterfeit prevention display body according to the third embodiment of the present invention.

  In order to produce the counterfeit-preventing display 1C, an alignment mark formation step, a coating step, a pattern formation step, and a metal atom introduction step are performed in this order.

  The alignment mark formation step is the same as the alignment mark formation step in the first embodiment.

Next, as shown in FIG. 6A, a coating process is performed. This step is the same as in the first embodiment except that the organic polymer 7C is applied instead of the organic polymer 7A in the first embodiment to form an organic polymer layer 17C on the substrate 2. This is the same process as the coating process.
The organic polymer 7C is a material that self-organizes a periodic phase separation structure that forms a lamellar structure by adjusting the volume ratio of the block copolymer.
As materials suitable for the organic polymer 7C, all materials suitable for the organic polymer 7A exemplified in the description of the first embodiment can be adopted.
The layer thickness of the organic polymer layer 17C is preferably in the same range as the organic polymer layer 17A in the first embodiment.

Next, a pattern formation process is performed. In this step, the organic polymer 7C is heated instead of the organic polymer 7A, and as shown in FIG. 6B, the lamellar domain 5c, which is a microdomain of the lamellar structure, is formed. It is the same process as the pattern formation process in one embodiment.
The organic polymer layer 17C is heated and cooled to become an organic polymer layer 17C ′ in which self-organization proceeds and a microphase separation structure is formed. In this embodiment, the microphase separation structure of the organic polymer layer 17C ′ is a microphase separation structure composed of a lamellar domain 5c having a lamellar structure and a continuous layer 6 as a microdomain as shown in FIG. Is done.
The lamellar domain 5c formed here has a periodic structure partially due to self-organization, and has a structure in which such periodic structures are irregularly combined as a whole. For example, as shown in FIG. 5A, the pattern is substantially the same (including the same case) as the fingerprint pattern of the thin line portion 8c.

As shown in FIG. 6B, the lamellar domain 5c formed in this way has one end in the layer thickness direction in close contact with the surface 2a of the substrate 2, and the other end on the surface of the organic polymer layer 17C ′. Exposed.
Therefore, in this step, it is not necessary to expose the lamella domain 5c on the surface of the organic polymer layer 17C ′. However, in order to ensure that the end of the lamella domain 5c is exposed from the organic polymer layer 17C ′ or to improve the flatness of the surface, the surface of the organic polymer layer 17C ′ is, for example, appropriately A slight removal process may be performed by etching or the like.
Thus, the pattern forming process is completed.

Next, a metal atom introduction step is performed. This step is the same as the metal atom introduction step in the first embodiment except that a metal atom is introduced into the lamellar domain 5c.
In the present embodiment, since the lamellar domain 5c is in contact with the surface 2a of the substrate 2, as a method for introducing metal atoms, the electroless plating method and the sol-gel method described in the first embodiment are used. In addition to the chemical modification method or the like, for example, an electroplating method or an electrolytic deposition method can be employed by employing a conductive substrate as the substrate 2.

For example, in order to perform this step by electroplating or electrolytic deposition, first, the conductive mark is used as the substrate 2, and the alignment mark forming step, the applying step, and the pattern forming step are performed.
In this step, a metal solvent that is a good solvent for the polymer component that forms the lamellar domain 5c and a poor solvent for the polymer component that forms the continuous layer 6 is used. The organic polymer layer 17C ′ is immersed in an electroplating bath or an electrolysis bath containing seeds.
Then, using the substrate 2 as a working electrode, a counter electrode and a reference electrode are placed in an electroplating bath or an electrolytic bath, and an electric field for depositing metal, metal oxide, or metal hydroxide is applied. Thereby, a metal, a metal oxide, or a metal hydroxide is selectively deposited on the lamella domain 5c, and a metal atom is introduced into the lamella domain 5c as a metal, a metal oxide, or a metal hydroxide.
Thereby, as shown in FIG.6 (c), the thin wire | line part 8c is formed along the lamella domain 5c.

When a metal atom is introduced into the lamellar domain 5c by any of the methods exemplified in the above and the first embodiment, this step is finished.
In this way, the counterfeit prevention display body 1 </ b> C in which the authenticity determination display portion 3 </ b> C including the fine line portion 8 c forming the fingerprint pattern as shown in FIGS. 5A and 5B is formed. .

  Such an anti-counterfeit display 1C can be used in the authenticity determination method of the first embodiment, similarly to the anti-counterfeit display 1A of the first embodiment.

The counterfeit prevention display body 1C of the present embodiment includes the authenticity determination display unit 3C having a unique pattern that is difficult to duplicate, exactly the same as the fingerprint pattern of the first embodiment. Similar to the embodiment, duplication is difficult and durability can be improved.
In particular, in the present embodiment, in the pattern formation step, the step of exposing the lamella domain 5c to the surface can be omitted, and thus the forgery prevention display body 1C can be more efficiently manufactured.

[Fourth Embodiment]
Next, a forgery prevention display body according to a fourth embodiment of the present invention will be described.
FIGS. 7A and 7B are a schematic enlarged plan view and a schematic enlarged sectional view of a counterfeit prevention display body according to the fourth embodiment of the present invention.

As shown in FIGS. 7A and 7B, the anti-counterfeit display 1D according to the present embodiment is replaced with the authenticity determination display unit 3C of the anti-counterfeit display 1C according to the third embodiment. , A display unit 3D for authenticity determination is provided.
Hereinafter, a description will be given focusing on differences from the third embodiment.

The authenticity determination display unit 3D is obtained by deleting the continuous phase 6 from the authenticity determination display unit 3C and leaving a thin line portion 8d that forms a fingerprint-like pattern similar to the thin line portion 8c in the third embodiment. It is.
The thin wire portion 8d is made of a single metal atom, a metal oxide, or a metal hydroxide similar to that in the third embodiment.

Next, a method for producing the forgery prevention display body 1D of the present embodiment will be described.
FIG. 8 is a schematic process explanatory view showing the manufacturing process of the counterfeit prevention display body of the fourth embodiment of the present invention.

  In order to manufacture the counterfeit prevention display 1D, first, the alignment mark formation step, the coating step, the pattern formation step, and the metal atom introduction step in the method for manufacturing the counterfeit prevention display body of the third embodiment are similarly performed. To produce a counterfeit-proof display 1C.

  Next, an organic polymer removal step is performed. In this step, the continuous phase 6 made of the organic polymer 7C and the lamellar domain 5c are removed from the substrate 2 and the fine wire portion 8c is left attached to the surface 2a. This is a step of forming the thin wire portion 8d made of metal, metal oxide, or metal hydroxide.

As a method for removing the continuous phase 6 and the lamella domain 5c, the same etching as in the second embodiment can be used.
In addition, for example, in the case of oxygen plasma etching, the etching conditions are set such that only the component of the organic polymer 7C is selectively removed with a chamber internal pressure of 10 Pa, an RF bias of 250 W, and an oxygen flow rate of 12 sccm.

When etching is performed in this manner, the continuous phase 6 and the lamellar domain 5c made of the organic polymer 7C are removed, and the thin wire portion 8d made of metal, metal oxide, or metal hydroxide introduced into the lamellar domain 5c is formed. Will be formed.
The line width of the thin line portion 8d formed in this way and the pitch in the striped pattern have dimensions derived from the conditions for self-organization of the organic polymer 7C.
Therefore, although etching is used, the dimensions are much finer than when a similar material containing metal atoms is etched to form a line.

In this way, when the organic polymer 7C is removed from the surface 2a and the fine line portion 8b remains on the surface 2a, the authenticity determination display portion 3D including the fine line portion 8d is formed as shown in FIG. .
Thereby, an organic polymer removal process is complete | finished and the display body 1D for forgery prevention is produced.

  Such an anti-counterfeit display 1D can be used in the authenticity determination method of the first embodiment, similarly to the anti-counterfeit display 1A of the first embodiment.

The anti-counterfeit display body 1D of the present embodiment includes the authenticity determination display unit 3D having a unique pattern that is difficult to duplicate, exactly the same as the fingerprint-like pattern of the third embodiment. Similar to the embodiment, duplication is difficult and durability can be improved.
In particular, in the present embodiment, the authenticity determination display unit 3D does not include the organic polymer 7C, which is inferior in durability to the thin line portion 8d, and therefore the durability can be further improved.

In the description of each of the above embodiments, the alignment mark is described in the case where the alignment mark is formed within the range where the fingerprint pattern of the authenticity determination display unit is formed. However, the alignment mark has a fingerprint pattern. It is also possible to provide in the area | region on the base material which is not formed.
In addition, when the verification range of the fingerprint pattern in the authenticity determination display unit can be specified by means other than the alignment mark, the alignment mark may be omitted. For example, the alignment mark can be omitted when the collation range can be specified based on the outer shape of the authenticity determination display unit, or when the entire authenticity determination display unit is within the collation range.

  In addition, all the components described in the above embodiments can be implemented by appropriately changing or deleting combinations within the scope of the technical idea of the present invention.

Examples of the anti-counterfeit display bodies 1A and 1B and the manufacturing method thereof according to the first embodiment and the second embodiment will be described.
FIGS. 9A and 9B are examples of images of an anti-counterfeit display body including an organic polymer layer, obtained in the phase mode of a scanning electron microscope, and an anti-counterfeit display body from which the organic polymer layer is removed. It is an example of an image. FIGS. 10A and 10B are an example of an image of an anti-counterfeit display body including an organic polymer layer and an image of an anti-counterfeit display body obtained by removing the organic polymer layer, acquired in the AFM phase mode. It is an example. In either case, the unit of the vertical axis and the horizontal axis is μm.

First, in order to produce the counterfeit-preventing display 1A, an alignment mark was formed on the surface of a silicon wafer cut into a 1 cm square, and the substrate 2 was manufactured (alignment mark forming step).
Next, a polystyrene-poly-2-vinylpyridine block copolymer (Mn = 44000-b-18500, Mw / Mn = 1.07) is used as the organic polymer 7A so that the weight concentration is 1%. A coating solution was prepared by preparing with toluene. Here, Mn is a number average molecular weight, and Mw is a weight average molecular weight.
Next, the organic polymer 7A was formed into a film by applying this coating liquid to the substrate 2 using a spin coating method (application process). At this time, the rotation speed of the spin coat was 1000 rpm.

Next, the pattern formation process was performed.
First, the substrate 2 on which the organic polymer layer 17A was formed was annealed (heated) for 24 hours at 230 ° C. using a vacuum oven to form a microphase separation structure. At this time, the formed organic polymer layer 17A ′ is not exposed to the surface of the organic polymer layer 17A ′ although the cylinder domain 5a is formed as schematically shown in FIG. Met.
When the layer thickness of the organic polymer layer 17A ′ was measured using AFM after the annealing treatment, it was 48 nm.
Next, in order to rupture the surface of the organic polymer layer 17A, a 1% HCl aqueous solution was dropped on the entire surface of the organic polymer layer 17A so as to cover it, and left at room temperature for 3 hours. Thereby, a self-organized pattern in which the cylinder domain 5a of 2-polyvinylpyridine was exposed on the surface of the organic polymer layer 17A was formed.

Next, an aqueous solution containing 10 mM HAuCl ₄ was dropped on the entire surface of the organic polymer layer 17A ′ so as to cover it, and left at room temperature for 3 hours (metal atom introduction step).
As a result, Au ions in the aqueous solution were selectively coordinated to the cylinder domain 5a and concentrated in the cylinder domain 5a.
Thereby, the counterfeit-proof display body 1A was produced.

Next, the obtained anti-counterfeit display 1A was subjected to oxygen plasma treatment (chamber internal pressure 10 Pa, RF bias 250 W, oxygen flow rate 12 sccm) to remove the organic polymer 7 by etching (organic polymer removal step).
Thereby, the display body 1B for forgery prevention was produced.

Next, an image of the collation range on the surface of the display unit 3A for authenticity determination of the obtained anti-counterfeit display 1A was acquired in a scanning electron microscope and an AFM phase mode. The collation range was specified using the alignment mark 4.
FIG. 9A shows an image obtained by a scanning electron microscope, and FIG. 10A shows an image obtained by an AFM.
Moreover, the image of the collation range of the surface of the display part 3A for authenticity determination of the display body 1B for forgery prevention is shown in FIG.9 (b) and FIG.10 (b).
As can be seen from the images in FIGS. 9A, 9B, 10A, and 10B, the obtained images are curved and irregular in any of the anti-counterfeit displays 1A and 1B. It was a self-organized pattern and was obtained as a clear pattern image.
The period in the striped pattern was 44 nm as calculated from these image data.

The obtained image data was registered as genuine image data. And as a process which performs authenticity determination, the image of the collation range was acquired again using the same sample.
After that, when it was compared with registered genuine image data, the acquired image matched the genuine image data. Therefore, it was confirmed that the same determination target as the genuine product is determined to be the genuine product.

  The present invention can be used, for example, for authenticity determination such as gold vouchers, securities, certification stamps, credit cards, membership cards, expensive articles, or very fine semiconductor-related parts.

1A, 1B, 1C, 1D Anti-counterfeit display (Anti-counterfeit display capable of authenticity determination)
2 Substrate 3A, 3B, 3C, 3D Authenticity display 4 Alignment mark 5a Cylinder domain (periodic phase separation structure, microdomain)
5c Lamella domain (periodic phase separation structure, microdomain)
6 Continuous phase (periodic phase separation structure)
7A, 7C Organic polymer (Organic polymer capable of self-organizing periodic phase separation structure)
17A, 17A ′, 17A ″, 17C, 17C ′ Organic polymer layers 8a, 8b, 8c, 8d

Claims (15)

An anti-counterfeit display body capable of authenticity determination comprising a base material and a display unit for authenticity determination provided along the base material,
The display unit for authenticity determination is
It has a thin line portion that is formed in a curved line or a broken line shape with a non-uniform line width, and in which metal atoms are densely formed,
The fine line portion forms a fingerprint-like pattern including a striped pattern arranged in parallel with a pitch wider than the line width.
Anti-counterfeit display that can determine authenticity. The pitch of the thin line portions in the striped pattern is
The display body for forgery prevention capable of authenticity determination according to claim 1, wherein the display body is 10 nm or more and 100 nm or less. On the base material between the thin wire portions, an organic polymer capable of forming a periodic phase separation structure in a self-organized manner is disposed,
The pitch of the thin line portions in the striped pattern is
The counterfeit-preventing display body capable of authenticity determination according to claim 1 or 2, wherein the display body matches the pitch of the periodic phase separation structure. The periodic phase separation structure is
4. The forgery prevention display body capable of authenticity determination according to claim 3, wherein the display body has a cylinder structure or a lamella structure. The layer thickness of the organic polymer is
5. The forgery prevention display body capable of authenticity determination according to claim 3 or 4, wherein the display body is 10 nm or more and 100 nm or less. The thin line portion is
The forgery prevention display body capable of authenticity determination according to claim 1 or 2, wherein the display body is made of a simple substance of the metal atoms or a compound containing the metal atoms attached on the base material. On the substrate within the range where the fingerprint pattern is formed,
The counterfeit prevention display body according to any one of claims 1 to 6, wherein an alignment mark having a fixed positional relationship with the fingerprint pattern is formed. A method for producing an anti-counterfeit display capable of determining authenticity comprising a base material and a display unit for authenticity determination provided along the base material,
An application step of applying an organic polymer capable of forming a periodic phase-separated structure in a self-organized manner onto a substrate;
By heating the organic polymer coated on the base material, the line width is extended in a non-uniform curve shape or a broken line shape, and stripes are arranged in parallel at a pitch wider than the line width. A pattern forming step of self-organizing a phase-separated structure having a microdomain that draws a fingerprint-like pattern including a pattern; and
A metal atom introduction step of forming a fine line portion in which the metal atoms are densely arranged along the microdomain by selectively introducing metal atoms into the microdomain of the phase separation structure;
Including
By executing these steps, a display unit for authenticity determination having the fine line portion that draws the fingerprint pattern is formed along the base material.
A method for producing an anti-counterfeit display capable of determining authenticity. After the metal atom introduction step,
The organic polymer is removed from the base material, and an organic polymer removal step is performed in which the thin wire portion made of the metal atom or the compound containing the metal atom is attached to the base material. Item 9. A method for producing an anti-counterfeit display body capable of determining authenticity according to Item 8. The pitch of the periodic phase separation structure in the striped pattern is
10 nm or more and 100 nm or less,
The layer thickness of the organic polymer is
The method for producing a forgery-preventing display body capable of authenticity determination according to claim 8 or 9, wherein the display body is 10 nm or more and 100 nm or less. The periodic phase separation structure is
The method for producing an anti-counterfeit display body capable of authenticity determination according to any one of claims 8 to 10, wherein the display body has a cylinder structure or a lamella structure. Before the coating process,
The method for producing an anti-counterfeit display body capable of authenticity determination according to any one of claims 8 to 11, wherein an alignment mark forming step of forming an alignment mark on the substrate is executed. An anti-counterfeit display body capable of authenticity determination comprising a base material and a display unit for authenticity determination provided along the base material,
The authenticity determination display unit is manufactured using the method for manufacturing an anti-counterfeit display body capable of determining authenticity according to any one of claims 8 to 12.
Anti-counterfeit display that can determine authenticity. An image of the fingerprint pattern obtained by acquiring an image of the authenticity determination display portion in the authentic product of the anti-counterfeit display body according to any one of claims 1 to 7, and reading from the acquired image The data is registered as the authentic image data of the anti-counterfeit display,
By acquiring an image of the authenticity determination display portion of the forgery prevention display object to be determined, and collating image data of the fingerprint pattern read from the acquired image with the genuine image data registered in advance , Determine the authenticity of the determination target,
Authenticity determination method. The image of the authenticity determination display section is:
The authenticity determination method according to claim 14, wherein the authenticity determination method is obtained by a scanning electron microscope or an atomic force microscope.