KR20210015031A - Device for preventing counterfeit - Google Patents

Abstract

An anti-counterfeiting element comprises: a first image element comprising a base and a diffractive optical element layer provided on the base and having a diffraction pattern to implement a first image for authenticity determination using light in a visible light region; a second image element disposed in a lower part of the diffractive optical element layer and provided to implement a second image for authenticity determination depending on external light other than the visible light or application conditions; and a bonding layer interposed between the first image element and the second image element to bond the first image element and the second image element to each other. Accordingly, the first and second images for authenticity determination can be implemented.

Description

Anti-counterfeiting device {DEVICE FOR PREVENTING COUNTERFEIT}

The present invention relates to an anti-counterfeiting device. In more detail, the present invention relates to an anti-counterfeiting device capable of implementing an image for determining authenticity using a pattern for determining authenticity.

Counterfeiting of expensive items such as software, CDs, DVDs, securities, liquor, and medicines has emerged as a major social problem. Because most of the products produced by counterfeiting have low quality, the company suffers enormous damage, such as undermining the trust gained through great efforts by such counterfeit acts. In order to solve such a forgery problem, companies are making efforts to prevent the distribution of counterfeit products by giving their products a technology that makes it difficult to counterfeit or determine the genuine and counterfeit products.

A hologram is a representative thing given to a product to prevent counterfeiting. In order to design a hologram, a hologram is designed using an interference shape between the reference light and the object light reflected from the object as the reference light and the object light irradiated to the object using a beam splitter.

The hologram is a medium in which interference fringes that reproduce a three-dimensional image are recorded and is made using the principle of holography. Accordingly, the hologram can implement a specific image by irradiating the reproduced light having the same frequency, wavelength, and phase as the reference light to the interference fringe at a specific angle. Also, the color or shape of the reflected light may change depending on the viewing angle.

However, since there is a limit to the information that can be recorded as a hologram, it is difficult to produce an elaborate hologram. Furthermore, there is a limit that the reproduced light must have the same phase, wavelength, and frequency as the reference light. This problem has become a serious problem that the duplication is easy as the hologram starts to be duplicated by a hologram duplication mechanism such as a digital scanner. In addition, the hologram pattern forming the hologram is regular as it has a certain shape.

Accordingly, in recent years, a technology for recording information on an anti-counterfeiting film using a nano-imprinting method has been introduced. The nano-imprinting method is a method of forming a diffraction pattern on an anti-counterfeiting film by using a mold having a nano pattern, and has been widely used in recent years because it can record a lot of information at low cost.

In general, the anti-counterfeiting film is irradiated in a straight direction so that the laser light transmitted through the inside is diffracted in a certain direction. Accordingly, after the laser light irradiated in a straight direction toward the anti-counterfeiting film passes through the anti-counterfeiting film, an image for anti-counterfeiting is realized by light diffracted by the diffraction pattern.

In recent years, in order to implement an anti-counterfeiting image, there is a demand for the development of an anti-counterfeiting device that implements a plurality of different images according to different application conditions.

Accordingly, an object of the present invention is to provide an anti-counterfeiting device capable of implementing a plurality of different authenticity determination images using different application conditions.

In order to achieve the above object, the anti-counterfeiting device according to an embodiment of the present invention is provided on a base and on the base, and has a diffraction pattern to implement a first authenticity determination image using light in the visible region. A first image element including a diffractive optical element layer provided so that it is disposed under the diffractive optical element layer, and can implement a second authenticity determination image according to external light or application conditions excluding the visible light. And a bonding layer interposed between the first image element and the second image element, and bonding the first and second image elements to each other.

In an embodiment of the present invention, the bonding layer may be interposed between the base and the second image element.

In one embodiment of the present invention, the bonding layer may be interposed between the diffractive optical element layer and the second image element.

Here, the first image element is provided along the profile of the diffraction pattern on the diffractive optical element layer, and a refractive index controlling thin film made of a material having a refractive index difference of at least 0.1 or more from a material constituting the diffractive optical element layer It may contain more.

In addition, the refractive index control thin film may include at least one of light reflective metallic materials made of gold, silver, and aluminum.

In an embodiment of the present invention, the second image element is a functional pattern that is interposed between a substrate and the substrate and the bonding layer, and can implement the second authenticity determination image according to the external light or application conditions It may include.

Here, the functional pattern may include a functional material capable of implementing the image for determining the second authenticity by converting optical properties according to any one of ultraviolet rays, heat, magnetism, humidity, and pressure.

According to the anti-counterfeiting device according to embodiments of the present invention, a first image device including a diffractive optical device layer using visible light and a second image device using light or application conditions other than the visible light are provided. . Accordingly, the anti-counterfeiting device can implement a plurality of authenticity determination images including a first authenticity determination image and a second authenticity determination image in response to different application conditions.

1 is a cross-sectional view illustrating an anti-counterfeiting device according to an embodiment of the present invention.
2 is a cross-sectional view illustrating an anti-counterfeiting device according to another embodiment of the present invention.
3 is a cross-sectional view illustrating a phase difference of reflected light reflected from a first image element included in an anti-counterfeiting element.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present invention, various modifications can be made and various forms can be obtained, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form of disclosure, it is to be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In the accompanying drawings, the sizes and amounts of objects are shown to be enlarged or reduced from the actual size for clarity of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "include" are intended to designate the existence of features, steps, functions, components, or combinations thereof described in the specification, and other features, steps, functions, and components It is to be understood that the possibility of addition or presence of or combinations thereof is not preliminarily excluded.

Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

1 is a cross-sectional view illustrating an anti-counterfeiting device according to an embodiment of the present invention.

Referring to FIG. 1, an anti-counterfeiting device according to an embodiment of the present invention includes a first image device 110, a second image device 120, and a bonding layer 130. The anti-counterfeiting device may implement a first authenticity determination image and a second authenticity determination image different from each other according to application conditions such as light, magnetism, or pressure applied from the outside.

The first image element 110 may implement the first authenticity determination image using visible light.

The first image element 110 includes a base 111 and a diffractive optical element layer 115.

The base 111 may be made of a polymer material. For example, the base 111 may be made of a PET material.

A diffractive optical element layer 115 is provided on the upper surface of the base 111.

A diffraction pattern is formed on the upper surface of the diffractive optical element layer 115. The diffraction pattern may have various sizes and shapes. For example, the shape of the diffraction pattern may include a stripe shape, a mosaic shape, a pyramid shape, and the like. The diffraction pattern may be defined as a pattern for using diffraction characteristics for implementing a specific image through a design algorithm including Fourier transform and Fourier inverse transform processes.

The diffraction pattern may be formed through a hot embossing process, a nanoimprinting process, or a transfer printing process.

The second image element 120 is disposed under the first image element 110. The second image element 120 is disposed under the diffractive optical element layer 115.

The second image element 120 is provided to implement a second authenticity determination image using external light or an application condition other than the visible light.

Examples of the external light may include ultraviolet rays. That is, the ultraviolet rays pass through the first image element 110 and reach the second image element 120. In this case, the second image element 120 may implement a second authenticity determination image.

Alternatively, the application condition may include heat, magnetism, humidity, or pressure. In this case, the second image element 120 may display a second authenticity determination image according to the application condition.

The second image element 120 includes a substrate 121 and a functional pattern 125 interposed between the substrate 121 and the bonding layer 130 and capable of implementing the second authenticity determination image. .

When the functional pattern 125 includes a heat-reactive material, the functional pattern 125 may have a property of discoloration according to temperature.

Examples of the heat-reactive material may include a mixture of a Zion pigment and a synthetic resin. Zion pigments included in the thermally reactive material may have a plurality of types. Accordingly, the functional pattern 125 may implement various color changes according to temperature.

The functional pattern 125 may include magnetic particles and a solvent. The magnetic particles are aligned in a direction parallel to the direction of the first magnetic field to form a particle chain. On the other hand, when a second magnetic field is applied to the particle chain, the particle chain moves in a direction close to the bonding layer 130. On the other hand, when the intensity or direction of the second magnetic field is changed, or when a third magnetic field opposite to the direction of the second magnetic field is applied, the particle chains move away to the bonding layer 130, and thus the contrast and darkness of the second authenticity determination image Color can be adjusted.

Meanwhile, the functional pattern 125 may implement a second authenticity determination image in response to humidity. In this case, the functional pattern 125 may include cobalt chloride. Alternatively, the functional pattern 125 may include a pigment and a humidity indicator solution. In this case, as the pigment, for example, a blue pigment manufactured by VIDHI (manufactured by Dyestuff Mfg.) may be used. In this case, the functional pattern 125 is colored green in a dry state and purple in a humid state, so that a change in humidity may be sensed.

Alternatively, the functional pattern 125 may include a liquid medium and a pigment distributed in the medium and having a different orientation according to the applied pressure.

That is, the liquid medium is sufficiently viscous so that the pigment, which can be aligned by pressure, is not reoriented when externally applied pressure is released. When a pressure is applied to the surface of the second image element 120 in a positive direction or a tangential direction (shearing), the liquid medium and the pigment are disturbed and the appearance of the element may be changed. At this time, the pigment may change from an equilibrium state to a disordered state by the applied pressure. On the other hand, upon removal of the pressure, the pigment returns to its aligned state.

The bonding layer 130 is interposed between the first image element 110 and the second image element 120. The bonding layer 130 bonds the first image element 110 and the second image element 120 to each other.

That is, the bonding layer 130 may be interposed between the base 111 and the substrate 1121 included in the second image element 120.

The bonding layer 130 may be formed through a laminating process. The bonding layer 130 may be cooled, for example, to bond the first image element 110 and the second image element 120 to each other.

The anti-counterfeiting device according to an embodiment of the present invention includes first and second image devices 110 and 120 capable of separately implementing first and second authenticity determination images, respectively, using visible light and an application condition different from the visible light. ). Thus, the authenticity determination element can implement a plurality of images.

2 is a cross-sectional view illustrating an anti-counterfeiting device according to an embodiment of the present invention.

Referring to FIG. 2, the anti-counterfeiting device according to an embodiment of the present invention includes a first image device 110, a second image device 120, and a bonding layer 130. The anti-counterfeiting device 100 may implement a first authenticity determination image and a second authenticity determination image different from each other according to an application condition such as light, magnetism, or pressure applied from the outside.

The first image element 110 may implement the first authenticity determination image using visible light. The first image element 110 includes a base 111, a diffractive optical element layer 115, and a refractive index adjusting thin film 117.

The base 111 may be made of a polymer material. For example, the base 111 may be made of a PET material. A diffractive optical element layer 115 is provided on the lower surface of the base 111.

A diffraction pattern is formed on the lower surface of the diffractive optical element layer 115. The diffraction pattern may have various sizes and shapes. For example, the shape of the diffraction pattern may include a stripe shape, a mosaic shape, a pyramid shape, and the like. The diffraction pattern may be defined as a pattern for using diffraction characteristics for implementing a specific image through a design algorithm including Fourier transform and Fourier inverse transform processes.

The diffraction pattern may be formed through a hot embossing process, a nanoimprinting process, or a transfer printing process.

The refraction control thin film 117 is formed along the profile of the diffraction pattern. Accordingly, the refractive index adjusting thin film 117 may be formed to have a uniform thickness. The refractive index control thin film 117 may be made of a material having a refractive index difference of at least 0.1 or more from a material constituting the diffractive optical element layer 115.

That is, if the refractive index adjusting thin film 117 is omitted, the difference in refractive index between the diffractive optical element layer 115 and the bonding layer 130 may be less than 0.1. In this case, the diffractive optical element layer 115 has difficulty in implementing a first authenticity determination image using the visible light. On the other hand, when the refractive index adjusting thin film 117 is interposed between the diffractive optical element layer 115 and the bonding layer 130, the refractive index adjusting thin film 117 and the diffractive optical element layer 115 The difference in refractive index between may be adjusted to 0.1 or more. Accordingly, the first image element 110 including the diffractive optical element layer 115 can easily implement a first authenticity determination image using visible light.

That is, when the difference in refractive index between the diffraction pattern of the diffractive optical element layer 115 and the underlying film in contact with the diffraction pattern is at least 0.1, the diffractive optical element layer 115 determines the first authenticity with visible light. Dragon images can be implemented.

The refractive index control thin film 117 may include a light reflective metal material such as gold, silver, and aluminum.

The thickness of the refractive index adjusting thin film 117 may be adjusted according to the required light transmittance. For example, the refractive index control thin film 117 may have a thickness of 1 nm to 4 nm.

The phase of the reflected light reflected from the surface of the refractive index adjusting thin film 117 is changed due to the step difference formed in the diffraction pattern of the refractive index adjusting thin film 117. Accordingly, a specific diffraction image may be implemented by the reflected lights being mutually interfered.

The second image element 120 is disposed under the first image element 110. That is, the second image element 120 is disposed under the diffractive optical element layer 115.

The second image element 120 is provided to implement a second authenticity determination image using external light or an application condition other than the visible light.

3 is a cross-sectional view illustrating a phase difference of reflected light reflected from a first image element included in an anti-counterfeiting element.

3, when there is a height difference (h) between diffraction patterns and the diffraction pattern has n _p (=1+p), the phase difference (φ1-φ2) at different positions is the following equation. Same as 1.

Here, k ₀ (=2π/λ), p is a difference value greater than 1, which is the refractive index of air, and h is the difference in height of the diffraction pattern.

Using the phase difference, an image for authenticity determination can be implemented from a diffraction pattern.

Although the present invention has been shown and described with reference to a preferred embodiment as described above, it is not limited to the above embodiment, and within the scope of the spirit of the present invention, various Transformation and change are possible. Such modifications and variations are to be viewed as falling within the scope of the present invention and the appended claims.

110: first image element 111: base
115: diffractive optical element layer 117: refractive index control thin film
120: second image element 121: substrate
135: functional pattern 130: bonding layer

Claims (7)

A first image element including a base and a diffractive optical element layer provided on the base and having a diffraction pattern to implement a first authenticity determination image using light in a visible light region;
A second image element disposed under the diffractive optical element layer and provided to implement a second authenticity determination image according to external light or application conditions excluding the visible light; And
An anti-counterfeiting device comprising a bonding layer interposed between the first image device and the second image device, and bonding the first image device and the second image device to each other. The device of claim 1, wherein the bonding layer is interposed between the base and the second image device. The device of claim 1, wherein the bonding layer is interposed between the diffractive optical device layer and the second image device. The method of claim 3, wherein the first image element is provided along the profile of the diffraction pattern on the diffractive optical element layer, and is made of a material having a refractive index difference of at least 0.1 or more from a material constituting the diffractive optical element layer. A device for preventing counterfeiting further comprising a refractive index adjusting thin film. The device of claim 4, wherein the refractive index control thin film comprises at least one selected from a group of light reflective metals formed by gold, silver and aluminum. The method of claim 1, wherein the second image element,
Board; And
An anti-counterfeiting device comprising a functional pattern interposed between the substrate and the bonding layer and capable of implementing the second authenticity determination image according to the external light or an application condition. The method of claim 6, wherein the functional pattern comprises a functional material capable of implementing the second authenticity determination image by converting optical properties according to any one of ultraviolet rays, heat, magnetism, humidity, and pressure. Anti-counterfeiting element.

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