KR102009115B1 - Reflective-transmissive type film for preventing counterfeit - Google Patents

Abstract

The anti-transmission anti-counterfeiting film is provided on the base, on the base, and formed along the profile of the diffraction pattern on the diffractive optical element layer and the diffractive optical element layer having a diffraction pattern for realizing the image for authenticity determination. And a light transmittance adjusting thin film capable of partially reflecting and transmitting incident light. As a result, the transflective anti-counterfeiting film may reflect and transmit incident light to implement diffraction images on both sides of the film.

Description

Transflective anti-counterfeiting film {REFLECTIVE-TRANSMISSIVE TYPE FILM FOR PREVENTING COUNTERFEIT}

The present invention relates to a transflective anti-counterfeiting film. More specifically, the present invention relates to a transflective anti-counterfeiting film capable of realizing an image for authenticity determination using a pattern for authenticity determination.

Counterfeiting of expensive items such as software, CDs, DVDs, securities, liquor, medicines, etc. is a big social problem. Since most of the counterfeit goods are of low quality, the company is suffering from the damage caused by the forgery of the company. In order to solve the counterfeit problem, companies are making efforts to prevent the distribution of counterfeit goods by giving them a technology that makes forgery difficult or a technology for judging genuine and counterfeit goods.

A hologram is a typical example given to a product to prevent forgery. In order to design the hologram, a hologram is designed using an interference shape between the object light and the reference light reflected from the object with the object light and the reference light irradiated to the object using a beam splitter.

The hologram is a medium recording interference fringes that reproduce a three-dimensional image, and is made using the principle of holography. As a result, the hologram may implement a specific image by irradiating the interference fringes with the same frequency, wavelength, and phase as the reference light to the interference fringe at a specific angle. In addition, the color or shape of the reflected light may change according to the viewing angle.

However, since the information that can be recorded as a hologram has a limit, it is difficult to produce a sophisticated 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 been serious because the hologram is started to be replicated by a hologram duplication mechanism such as a digital scanner and the duplication is easy. In addition, the hologram pattern constituting the hologram is regular as it has a certain shape.

Accordingly, recently, a technique of recording information on an anti-counterfeiting film by a nano imprinting method was introduced. The nanoimprinting method is a method of forming a diffraction pattern on an anti-counterfeiting film using a mold having a nanopattern, and thus has been widely used in recent years because a large amount of information can be recorded at low cost.

Generally, the anti-counterfeiting film is irradiated in a straight direction so that the laser beam transmitted through the inside is diffracted in a constant direction. Accordingly, the anti-counterfeiting pattern is realized by the light diffracted by the diffraction pattern after the laser irradiated in the straight direction to the anti-counterfeiting film passes through the anti-counterfeiting film.

However, the transmissive anti-counterfeiting film has a problem that is difficult to apply to products of various shapes including the three-dimensional bulk. In addition, since the transmissive anti-counterfeiting film itself must ensure light transmittance as a whole, there is a limitation in the material forming the transmissive anti-counterfeiting film.

Accordingly, one object of the present invention is to provide a semi-transmissive anti-counterfeiting film which overcomes the limitation of light transmittance of the transmissive anti-counterfeiting film.

In order to achieve the above object, the anti-transmission anti-counterfeiting film according to an embodiment of the present invention is provided on the base, the base, the diffractive optical element layer having a diffraction pattern for realizing the image for authenticity determination and the It is formed along the profile of the diffraction pattern on the diffractive optical element layer, and includes a light transmittance adjusting thin film capable of partially reflecting and transmitting the incident incident light.

In one embodiment of the present invention, the light transmittance adjusting thin film has a light transmittance in the range of 40 to 60% of the light having a wavelength in the visible light region, the image for authenticity determination toward both the top and bottom of the base. Can be implemented,

In one embodiment of the present invention, the light transmittance adjusting thin film may include at least one selected from the group of light reflective metals made of gold, silver and aluminum.

In one embodiment of the present invention, at least one information pattern unit for storing information on the upper or lower portion of the base may be further provided.

Here, the light transmittance adjusting thin film may have a thickness adjusted to have a maximum transmittance with respect to incident light having a wavelength of 500 to 600 nm.

Here, the information pattern portion may be provided on the bottom surface of the base, and may include a QR pattern layer including QR information.

On the other hand, the light transmittance adjusting thin film may have a thickness adjusted so that the light transmittance adjusting thin film has a transmittance of less than 50% with respect to incident light having a wavelength of 500 to 600 nm.

In this case, the information pattern part may include a hologram pattern layer provided on the light transmittance adjusting thin film and using incident light having a wavelength of 500 to 600 nm as reproduction light. In addition, a transparent bonding layer interposed between the light transmission control thin film and the hologram pattern layer may be further provided to bond the light transmission control thin film and the hologram pattern layer to each other.

Meanwhile, the light transmittance adjusting thin film has a light transmittance within a range of 40 to 60% with respect to light having a wavelength in the visible light region, and the information pattern portion has a hologram pattern layer formed on an upper portion of the base and a QR formed on the lower portion of the base. It may include a pattern layer.

In one embodiment of the present invention, a bonding layer for bonding the planarization layer and the light transmission control thin film interposed between the planarization layer and the light transmission control thin film and the planarization layer provided on the light transmission control thin film. This may be additionally provided.

According to the transflective anti-counterfeiting film according to embodiments of the present invention, by providing a diffractive optical element that can replace the hologram, it is possible to implement a nano-sized fine pattern. As a result, a complex image can be easily implemented, and a diffraction pattern having an irregularly random shape or size can be implemented. In addition, an image having a plurality of colors may be easily implemented using light having various wavelengths and phases.

On the other hand, unlike the conventional transmissive anti-counterfeiting film, it is possible to implement the image for forgery determination toward both the upper and lower surfaces of the base. Therefore, the authenticity of the subject can be easily determined regardless of the degree of light transmittance of the subject.

Furthermore, as the additional hologram pattern layer or the QR pattern layer is additionally provided, the forgery determination may be performed more accurately, or additional information for tracking and managing the product may be stored.

Meanwhile, as the planarization layer and the bonding layer are additionally provided, the thickness of the transflective anti-counterfeiting film may be effectively adjusted as the thickness of the bonding layer changes.

1 is a cross-sectional view illustrating a transflective anti-counterfeiting film according to an embodiment of the present invention.
FIG. 2 is a graph illustrating light transmittance according to the thickness of the light transmittance adjusting thin film of FIG. 1.
3 is a cross-sectional view illustrating a transflective anti-counterfeiting film according to another embodiment of the present invention.
Figure 4 is a cross-sectional view illustrating a semi-transmission anti-counterfeiting film according to another embodiment of the present invention.
5 is a cross-sectional view illustrating a semi-permeable anti-counterfeiting film according to another embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a semi-permeable anti-counterfeiting film according to an embodiment of the present invention.
7A is a photograph photographing a hologram as a comparative example.
It is a photograph which image | photographed the semi-transmissive anti-counterfeiting film which has the diffractive optical element of this invention.
8 is a cross-sectional view for explaining a phase difference of light transmitted through a diffraction pattern included in a transmissive anti-counterfeiting film.
9 is a cross-sectional view for explaining a phase difference of light transmitted through a diffraction pattern included in a reflective anti-counterfeiting film.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous embodiments, particular 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 the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In the accompanying drawings, the size and amount of the objects are shown to be enlarged or reduced than actual for clarity of the invention.

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

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "include" are intended to indicate that there is a feature, step, function, component, or combination thereof described on the specification, and other features, steps, functions, components Or it does not exclude in advance the possibility of the presence or addition of them in combination.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

Referring to FIG. 1, the anti-transmission anti-counterfeiting film 100 according to an embodiment of the present invention includes a base 110, a diffractive optical element layer 130, and a light transmittance adjusting thin film 150. The transflective anti-counterfeiting film 100 has a part of the LED light or laser light incident from the outside is reflected from the light transmittance adjusting thin film 150 and part is transmitted. As a result, a specific image may be embodied toward both the upper and lower portions of the base 110. In this case, the specific image may correspond to an image for authenticity determination. For example, the specific image may include a trademark or a log of a manufacturing company of an object requiring authenticity determination.

The base 110 may be made of a polymer material. For example, the base 110 may be made of a PET material. In addition, since the double-sided adhesive tape (not shown) is formed on the lower surface of the base 110, it may be provided to attach the base 110 to a specific product.

The diffractive optical element layer 130 is provided on the top surface of the base 110.

A diffraction pattern is formed on the upper surface of the diffractive optical element layer 130. 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 realizing a specific image through a design algorithm including a Fourier transform and a Fourier inverse transform.

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

The light transmittance adjusting thin film 150 is formed along the profile of the diffraction pattern. As a result, the light transmittance adjusting thin film 150 may be formed to have a uniform thickness. The light transmittance adjusting thin film 150 may reflect a part of the light incident to the outside to implement a specific image thereon, while transmitting a portion of the external light to implement a specific image thereunder. Therefore, the anti-transmission anti-counterfeiting film 100 including the light transmittance adjusting thin film 150 may be used regardless of the light transmittance of the object for authenticity determination.

The light transmittance adjusting thin film 150 may include a light reflective metal material such as gold, silver, and aluminum.

The light transmittance of the light transmittance adjusting thin film 150 may be adjusted according to its thickness. For example, the light transmittance adjusting thin film 150 may have a thickness of 1 nm to 4 nm.

Due to the step formed in the diffraction pattern of the light transmittance adjusting thin film 150, the light reflected from the surface of the light transmittance adjusting thin film 150 is changed in phase. As a result, the reflected light may interfere with each other to implement a specific diffraction image.

FIG. 2 is a graph illustrating light transmittance according to the thickness of the light transmittance adjusting thin film of FIG. 1.

Referring to FIG. 2, when the light transmittance adjusting thin film 150 is made of gold, light transmittance according to the wavelength of each thickness is shown.

When the light transmittance adjusting thin film 150 is made of gold, the light transmittance adjusting thin film 150 may have a thickness of 2 to 4 nm. As a result, the light transmittance adjusting thin film may have a light transmittance of 40 to 60% in the visible light region.

In particular, at 550 nm of external light, the light transmittance adjusting thin film having a thickness of 3 nm is estimated to have a light transmittance of about 50%.

According to an embodiment of the present invention, unlike the conventional transmissive anti-counterfeiting film, the transflective anti-counterfeiting film 100 may be attached to an object having various shapes including a three-dimensional bulk. That is, in the case of the conventional transmissive anti-counterfeiting film by implementing the image for authenticity determination using the transmitted light transmitted through the product, it is difficult to use the transmissive anti-counterfeiting film when the object is opaque.

On the other hand, the semi-transmissive anti-counterfeiting film 100 according to an embodiment of the present invention may have an advantage that can be used regardless of the various shapes or materials of the object to be attached.

In one embodiment of the present invention, the transflective anti-counterfeiting film 100 further includes a planarization layer 190 and a bonding layer 170.

The planarization layer 190 is provided on the light transmission control thin film 150. The planarization layer 190 removes the step formed in the diffraction pattern to planarize the entire upper surface thereof.

The planarization layer 190 is provided to cover the light transmittance adjusting thin film 150. As a result, the planarization layer 190 may protect the light transmittance adjusting thin film 150 and the diffractive optical element layer 130 from external impact. In addition, since the planarization layer 190 covers the diffractive optical element layer 130 as a whole, replication of the anti-transmission anti-counterfeiting film 100 may be suppressed.

The planarization layer 190 may be formed of any one of light transmitting resins formed of PVC, PMMA, PET, PT, acrylic, and epoxy.

The bonding layer 170 is interposed between the planarization layer and the light transmission control thin film. The bonding layer 170 bonds the planarization layer 190 and the light transmission control thin film 150 to each other. The bonding layer 170 may be formed through a laminating process. For example, the bonding layer 170 may be cooled to bond the planarization layer 190 and the light transmission control thin film 150 to each other.

Examples of the material forming the bonding layer 170,

Figure 3 is a cross-sectional view illustrating a semi-permeable anti-counterfeiting film according to an embodiment of the present invention.

Referring to FIG. 3, the anti-transmission anti-counterfeiting film 100 according to an embodiment of the present invention includes a base 110, a diffractive optical element layer 130, a light transmittance adjusting thin film 150, and an information pattern portion. . The information pattern portion may include, for example, a hologram pattern layer 180.

The hologram pattern layer 180 is provided on the light transmittance adjusting thin film 150. The hologram pattern layer 180 uses reflected light in which a part of incident light incident to the outside is reflected from the light transmittance adjusting thin film 150. As a result, the transflective anti-counterfeiting film 100 may implement a hologram thereon.

On the other hand, the transmitted light through which part of the incident light incident to the outside is transmitted through the light transmittance adjusting thin film 150 is a diffraction pattern formed on the diffractive optical element layer 130 and the light transmittance adjusting thin film 150 and the diffractive optical element. The difference in refractive index between the layers 130 may produce a specific image. As a result, the transflective anti-counterfeiting film 100 may determine whether the forgery is performed using the specific image.

As a result, the anti-reflective anti-counterfeiting film 100 may implement a hologram on the top thereof and simultaneously implement a specific image on the bottom thereof.

Here, the light transmittance adjusting thin film 150 may have a thickness adjusted to have a transmittance of less than 50% with respect to incident light having a wavelength of 500 to 600 nm. As a result, as the light transmittance adjusting thin film 150 has a relatively high light reflectivity with respect to the incident light, light required for realizing the hologram may reach the hologram pattern layer 180 in a greater amount.

4 is a cross-sectional view illustrating a semi-transmission anti-counterfeiting film according to an embodiment of the present invention.

Referring to FIG. 4, the anti-transmission anti-counterfeiting film 100 according to an embodiment of the present invention includes a base 110, a diffractive optical element layer 130, a light transmittance adjusting thin film 150, and an information pattern portion. . The information pattern unit may include, for example, a QR pattern layer 120.

The QR pattern layer 120 is located below the base 110. The QR pattern layer 120 uses transmitted light through which some of the incident light incident to the outside has passed through the light transmittance adjusting thin film 150. As a result, the transflective anti-counterfeiting film 100 may recognize the information stored in the QR pattern layer 120 located below the bonding layer 170. That is, a QR scanner (not shown) may facilitate tracking and managing an object by using the information, for example, a production lot, by scanning the QR pattern layer 120.

As a result, the anti-reflective anti-counterfeiting film 100 implements a specific image at the bottom thereof, and can read QR information formed at the bottom thereof.

Here, the light transmittance adjusting thin film 150 may have a thickness adjusted to have a maximum transmittance with respect to incident light having a wavelength of 500 to 600 nm. Thus, as the light transmittance adjusting thin film 150 has a relatively high light transmittance with respect to the incident light, it may reach the QR pattern layer 120 in a greater amount. Therefore, the QR scanner can effectively recognize the information stored in the QR pattern layer 120.

5 is a cross-sectional view illustrating a semi-permeable anti-counterfeiting film according to an embodiment of the present invention.

Referring to FIG. 5, the anti-transmission anti-counterfeiting film 100 according to an embodiment of the present invention includes a base 110, a diffractive optical element layer 130, a light transmittance adjusting thin film 150, and an information pattern portion. . The information pattern unit may include, for example, a hologram pattern layer 180 and a QR pattern layer 120.

The hologram pattern layer 180 is provided on the light transmittance adjusting thin film 150. The hologram pattern layer 180 uses reflected light in which a part of incident light incident to the outside is reflected from the light transmittance adjusting thin film 150. As a result, the transflective anti-counterfeiting film 100 may implement a hologram thereon.

The QR pattern layer 120 is positioned below the base 110. The QR pattern layer 120 uses transmitted light through which some of the incident light incident to the outside has passed through the light transmittance adjusting thin film 150. As a result, the transflective anti-counterfeiting film 100 may recognize the information stored in the QR pattern layer 120 located below the base 110. That is, the QR scanner scans the QR pattern layer 120 to facilitate tracking and management of an object using the information, for example, a production lot.

6 is a flowchart illustrating a method of manufacturing a semi-transmission anti-counterfeiting film according to an embodiment of the present invention.

1 and 6, in the method for manufacturing a transflective anti-counterfeiting film according to an embodiment of the present invention, first, a diffractive optical element layer 130 is formed on one surface of the base 110 (S110). ). The diffractive optical element layer 130 having the diffraction pattern may be formed through a hot embossing process, a nano imprinting process, or a transfer printing process.

Subsequently, along the profile of the diffraction pattern, a light transmittance adjusting thin film 150 for reflecting and transmitting the light incident to the outside is formed (S130). The light transmittance adjusting thin film 150 may be formed through an atomic layer deposition process, a sputtering process, or an ion beam process.

The light transmittance adjusting thin film 150 may be formed using a light reflective metal material such as gold, silver, and aluminum. The light transmittance adjusting thin film 150 may be formed to have a thickness of 1 nm to 4 nm.

Meanwhile, an information pattern layer such as the QR pattern layer 120 is formed on the other surface of the base 110. Alternatively, an information pattern layer such as the hololog spam pattern layer 180 (see FIG. 5) is formed on a separate base.

Thereafter, the information pattern layer is bonded onto the light transmittance adjusting thin film 150. As a result, a semi-transmissive anti-counterfeiting film 100 including an information pattern layer and the light transmittance adjusting thin film 150 is manufactured.

7A is a photograph photographing a hologram as a comparative example. It is a photograph which image | photographed the semi-transmissive anti-counterfeiting film which has the diffractive optical element of this invention.

Referring to FIGS. 7A and 7B, the hologram has a structure in which an interference fringe is formed repeatedly, while the anti-transmission anti-counterfeiting film having the diffractive optical element of the present invention has a structure in which an irregular fringe is formed in multiple layers. can confirm.

8 is a cross-sectional view for explaining a phase difference of light transmitted through a diffraction pattern included in a transmissive anti-counterfeiting film.

Referring to FIG. 8, when there is a height difference h between diffraction patterns, and the diffraction pattern has n _p (= 1 + p),

The phase difference (φ ₁ -φ ₂ ) at different positions is shown in Equation 1 below.

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

The phase difference may be used to implement an image for authenticity determination from a diffraction pattern.

9 is a cross-sectional view for explaining a phase difference of light transmitted through a diffraction pattern included in a reflective anti-counterfeiting film.

Referring to FIG. 9, when there is a height difference h between diffraction patterns and the diffraction pattern has n _p (= 1 + p),

The phase difference (φ ₁ -φ ₂ ) at different positions is shown in Equation 1 below.

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

The phase difference may be used to implement an image for authenticity determination from a diffraction pattern.

Although the present invention has been shown and described with reference to preferred embodiments as described above, it is not limited to the above embodiments and various modifications made by those skilled in the art without departing from the spirit of the present invention. Modifications and variations are possible. Such modifications and variations are intended to be within the scope of the invention and the appended claims.

100: transflective anti-counterfeiting film 110: base
130: diffractive optical element layer 150: light transmittance adjusting thin film
170: bonding layer 190: planarization layer

Claims (11)

Base;
A diffractive optical element layer provided on the base and having a diffraction pattern for realizing an image for authenticity determination;
A light transmittance adjusting thin film formed on the diffractive optical element layer along a profile of the diffraction pattern and partially reflecting and transmitting incident incident light;
At least one information pattern unit for storing information on the upper or lower portion of the base,
The light transmittance adjusting thin film has a thickness adjusted to have a maximum transmittance with respect to incident light having a wavelength of 500 to 600 nm,
The information pattern portion is provided on the lower surface of the base, semi-transmissive anti-counterfeiting film, characterized in that it comprises a QR pattern layer containing QR information. According to claim 1, The light transmittance adjusting thin film has a light transmittance in the range of 40 to 60% of the light having a wavelength in the visible light region, and can implement the image for authenticity determination toward both the top and bottom of the base Semi-transmissive anti-counterfeiting film, characterized in that. The anti-transmission anti-counterfeiting film of claim 1, wherein the light transmittance adjusting thin film includes at least one selected from a group of light reflective metals formed of gold, silver, and aluminum. delete delete delete The anti-transmission anti-counterfeiting film of claim 1, wherein the light transmittance adjusting thin film has a thickness adjusted to have a transmittance of less than 50% with respect to incident light having a wavelength of 500 to 600 nm. The anti-transmission anti-counterfeiting film according to claim 7, wherein the information pattern part comprises a hologram pattern layer provided on the light transmittance adjusting thin film and using incident light having a wavelength of 500 to 600 nm as reproduction light. The anti-transmission anti-counterfeiting agent of claim 8, further comprising a transparent bonding layer interposed between the light transmission control thin film and the hologram pattern layer and mutually bonding the light transmission control thin film and the hologram pattern layer. film. According to claim 1, The light transmittance adjusting thin film has a light transmittance in the range of 40 to 60% with respect to light having a wavelength in the visible light region,
The information pattern portion is a semi-transmission anti-counterfeiting film, characterized in that it comprises a holographic pattern layer formed on the upper portion and the QR pattern layer formed on the lower portion of the base. According to claim 1, Flattening layer provided on top of the light transmission control thin film; And
The anti-transmission anti-counterfeiting film further comprises a bonding layer interposed between the light transmission control thin film and the planarization layer to bond the planarization layer and the light transmission control thin film to each other.

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