JP6799098B2 - Semi-transparent anti-counterfeit film - Google Patents

Description

The present invention relates to a semi-transmissive type anti-counterfeit film, and more particularly to a semi-transmissive type anti-counterfeit film capable of embodying an image for authenticity determination by using an authenticity determination pattern.

Forgery of expensive items such as software, CDs, DVDs, securities, Western liquors, and medicines has become a major social problem. Since many of the counterfeit goods have low quality, such counterfeiting has caused enormous damage such as loss of trust gained by the manufacturer with much effort. In order to solve such a counterfeiting problem, manufacturers are making efforts to prevent the distribution of counterfeit products by imparting technology that makes counterfeiting difficult or technology that determines whether the product is genuine or counterfeit.

A typical example of a product given to prevent counterfeiting is a hologram. In order to design a hologram, a hologram is designed by using an object light and a reference light to be applied to an object by using a beam splitter, and using an interference phenomenon between the object light reflected from the object and the reference light.

The hologram is a medium on which interference fringes that reproduce a stereoscopic image are recorded, and is created using the principle of holography. Thereby, the hologram can realize a specific image by irradiating the interference fringes with reproduced light having the same frequency, wavelength and phase as the reference light at a specific angle. Also, the color or morphology of the reflected light can change depending on the viewing angle.

However, since there is a limit to the information that can be recorded by a hologram, there is a problem that it is difficult to produce an elaborate hologram. As a result, the reproduced light must have the same phase, wavelength, and frequency as the reference light. From such a problem, it becomes easy to reproduce a hologram by a hologram duplication device such as a digital scanner, and the problem becomes serious. Further, since the hologram pattern forming the hologram has a certain shape, it is regular.

As a result, a technique for recording information on an anti-counterfeit film using the nano-imprinting method was recently introduced. The nanoimprinting method is a method of forming a diffraction pattern on an anti-counterfeit film using a mold having a nanopattern, and is widely used in recent years because a large amount of information can be recorded at low cost. ing.

Normally, the anti-counterfeit film is irradiated in the straight direction so that the laser transmitted through the inside is diffracted in a certain direction. As a result, after the laser irradiating the anti-counterfeit film in the straight direction passes through the anti-counterfeit film, the anti-counterfeit pattern is embodied by the light diffracted by the diffraction pattern.

However, the transmissive anti-counterfeit film has a problem that it is difficult to apply to products having various shapes including a three-dimensional bulk. Further, since the transmissive anti-counterfeit film itself must ensure light transmission as a whole, there are restrictions on the material of the transmissive anti-counterfeit film.

The present invention has been made in view of the above problems, and one object of the present invention is to provide a semi-transmissive anti-counterfeit film that overcomes the limitation of light transmission of the transmissive anti-counterfeit film. With the goal.

In order to achieve the above object, the transflective anti-counterfeit film according to an embodiment of the present invention has a base and a diffraction pattern provided on the base to embody an image for authenticity determination. A diffractive optical element layer and a light transmittance adjusting thin film formed on the diffractive optical element layer along the profile of the diffraction pattern and capable of partially reflecting and transmitting incident incident light are included.

In one embodiment of the present invention, 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, and both the upper part and the lower part of the base. It is possible to embody an image for authenticity judgment toward.

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

In one embodiment of the invention, an upper or lower portion of the base may further include at least one information pattern section that stores information.

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

At this time, the information pattern unit may be provided on the lower surface of the base and include a QR pattern layer containing QR information.

The light transmittance adjusting thin film may have a thickness adjusted so as to have 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 unit 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. Further, a transparent bonding layer that is sandwiched between the light transmission adjusting thin film and the hologram pattern layer and that mutually bonds the light transmission adjusting thin film and the hologram pattern layer may be further provided.

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, and the information pattern portion is a hologram formed on the upper part of the base. It may include a pattern layer and a QR pattern layer formed on the lower part of the base.

In one embodiment of the present invention, the flattening layer provided on the upper part of the light transmission adjusting thin film is sandwiched between the light transmission adjusting thin film and the flattening layer, and the flattening layer and the light transmission adjusting are sandwiched between the flattening layer. A bonding layer for mutual bonding with the thin film may be further provided.

According to the transflective anti-counterfeit film according to the embodiment of the present invention, a nano-sized fine pattern can be realized by providing a diffractive optical element that can replace the hologram. Thereby, a complex image can be easily embodied, and a diffraction pattern having an irregularly random shape or size can be embodied. In addition, an image having a plurality of colors can be easily realized by using light having various wavelengths and phases.

In addition, unlike the existing transmissive anti-counterfeit film, it is possible to embody an image for forgery determination toward both the upper surface and the lower surface of the base. Therefore, the authenticity of the target body can be easily determined regardless of the degree of light transmission of the target body.

By extension, a separate hologram pattern layer or QR pattern layer can be additionally provided to make the counterfeit determination more accurate or to store additional information for tracking and managing the product.

On the other hand, by additionally providing the flattening layer and the bonding layer, the thickness of the semi-transmissive anti-counterfeit film can be effectively adjusted by changing the thickness of the bonding layer.

It is sectional drawing explaining the semi-transmissive type anti-counterfeit film by one Example of this invention. It is a graph which showed the light transmittance by the thickness of the light transmittance adjustment thin film of FIG. It is sectional drawing explaining the semi-transmissive type anti-counterfeit film by another Example of this invention. It is sectional drawing explaining the semi-transmissive type anti-counterfeit film according to still another Example of this invention. It is sectional drawing explaining the semi-transmissive type anti-counterfeit film according to still another Example of this invention. It is a flowchart explaining the manufacturing method of the semi-transmissive type anti-counterfeit film by the Example of this invention. As a comparative example, it is a photograph which imaged a hologram. It is a photograph which imaged the transflective type anti-counterfeit film which has the diffractive optical element of this invention. It is sectional drawing for demonstrating the phase difference of the light transmitted through the diffraction pattern contained in the transmission type anti-counterfeit film. It is sectional drawing for demonstrating the phase difference of the light transmitted through the diffraction pattern contained in the reflection type anti-counterfeit film.

Hereinafter, the grounding clamp unit and the substrate support assembly according to the embodiment of the present invention will be described in detail with reference to the attached drawings. The present invention can be modified in various ways and can have various forms, and a specific embodiment will be illustrated in the drawings and described in detail in the text. However, it should be understood that this does not limit the invention to any particular form of disclosure, but includes all modifications, equivalents, or alternatives contained within the ideas and technical scope of the invention. In the description of each drawing, similar reference numerals are given to similar components. In the accompanying drawings, the dimensions of the structure are shown enlarged for the sake of clarity of the present invention.

The terms first, second, etc. can be used to describe various components, but the components are not limited by the terms. The term is used only to distinguish one component from the other. For example, the first component may be referred to as the second component, and the second component may be referred to as the first component without departing from the scope of rights of the present invention.

The terms used herein are merely used to describe a particular embodiment and are not intended to limit the invention. A singular expression includes multiple expressions unless they are expressed in a distinctly different context. As used herein, terms such as "including" or "having" are intended to include features, numbers, stages, actions, components, parts, or a combination thereof described herein. It should be understood that it does not preclude the existence or addition of one or more other features or numbers, stages, actions, components, components, or combinations thereof.

Unless defined as different, all terms used herein, including technical or scientific terms, are generally understood by those with ordinary knowledge in the technical field to which the present invention belongs. It has the same meaning as the one. Terms such as those defined in commonly used dictionaries should be construed as having a meaning consistent with the meaning in the context of the relevant technology and is ideal unless explicitly defined in this application. Is not interpreted in an overly formal sense.

FIG. 1 is a cross-sectional view illustrating a reflective-transmissive type anti-counterfeit film according to an embodiment of the present invention.

Referring to FIG. 1, the transflective anti-counterfeit 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. In the semi-transmissive anti-counterfeit film 100, LED light or laser light incident from the outside is partially reflected from the light transmittance adjusting thin film 150 and partially transmitted. Thereby, a specific image can be embodied toward both the upper part and the lower part of the base 110. At this time, the specific image may be an image for authenticity determination. For example, the particular image may include a trademark or logo of the manufacturer of the object that requires authenticity determination.

The base 110 may be made of a polymeric material. For example, the base 110 can be a PET material. Further, a double-sided adhesive tape (not shown) is formed on the lower surface of the base 110 so that the base 110 can be attached to a specific product.

A diffractive optical element layer 130 is provided on the upper surface of the base 110.

A diffraction pattern is formed on the upper surface of the diffractive optical element layer 130. The diffraction pattern can have a variety of 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 can be defined as a pattern for using diffraction characteristics to embody a particular image through a design algorithm that includes a Fourier transform and an inverse Fourier transform process.

The diffraction pattern can be formed by a hot embossing step, a nanoimprinting step or a transfer printing step.

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 can be formed so as to have a uniform thickness. The light transmittance adjusting thin film 150 can reflect a part of the light incident from the outside and embody a specific image on the upper part thereof, while transmitting a part of the external light and transmit a specific image on the lower part thereof. Can be realized. Therefore, the semi-transmissive anti-counterfeit film 100 including the light transmittance adjusting thin film 150 can be used regardless of the light transmittance of the authenticity determination target.

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

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

In the light transmittance adjusting thin film 150, the phase of the light reflected on the surface of the light transmittance adjusting thin film 150 changes depending on the step formed in the diffraction pattern. As a result, a specific diffraction image can be realized by mutual interference of the reflected light.

FIG. 2 is a graph showing the light transmittance depending on the thickness of the light transmittance adjusting thin film of FIG.

With reference to FIG. 2, when the light transmittance adjusting thin film 150 is made of gold, the light transmittance according to the wavelength according to the thickness thereof 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 can have a light transmittance of 40 to 60% in the visible light region.

In particular, it is estimated that the light transmittance adjusting thin film having a thickness of 3 nm has a light transmittance of about 50% in external light of 550 nm.

According to one embodiment of the present invention, unlike the existing transmissive anti-counterfeit film, the semi-transmissive anti-counterfeit film 100 adheres to objects having various shapes including a three-dimensional bulk. It is possible. That is, in the case of the existing transmissive anti-counterfeit film, since the image for authenticity determination is realized by using the transmitted light transmitted through the product, when the object is opaque, the transmissive counterfeit It is difficult to use a protective film.

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

In one embodiment of the present invention, the semi-transmissive anti-counterfeit film 100 further includes a flattening layer 190 and a bonding layer 170.

The flattening layer 190 is provided on the upper portion of the light transmission adjusting thin film 150. The flattening layer 190 removes the step formed in the diffraction pattern and flattens the upper surface thereof as a whole.

The flattening layer 190 is provided so as to cover the light transmittance adjusting thin film 150. As a result, the flattening layer 190 can protect the light transmittance adjusting thin film 150 and thus the diffractive optical element layer 130 from external impact. Further, by covering the diffractive optical element layer 130 as a whole with the flattening layer 190, duplication of the semitransmissive anti-counterfeit film 100 can be suppressed.

The flattening layer 190 can be formed from any one of light transmissive resins made of PVC, PMMA, PET, PT, acrylic and epoxy.

The bonding layer 170 is sandwiched between the flattening layer and the light transmission adjusting thin film. The bonding layer 170 mutually bonds the flattening layer 190 and the light transmission adjusting thin film 150. The bonding layer 170 can be formed by a laminating step. The bonding layer 170 can mutually bond the flattening layer 190 and the light transmission adjusting thin film 150, for example, by cooling.

FIG. 3 is a cross-sectional view illustrating a semi-transmissive anti-counterfeit film according to an embodiment of the present invention.

Referring to FIG. 3, the semi-transmissive anti-counterfeit 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.

The hologram pattern layer 180 is provided on the upper portion of the light transmittance adjusting thin film 150. The hologram pattern layer 180 uses reflected light in which a part of the incident light incident from the outside is reflected from the light transmittance adjusting thin film 150. As a result, the semitransparent anti-counterfeit film 100 can embody a hologram on the upper portion thereof.

On the other hand, the transmitted light transmitted by a part of the incident light incident from the outside through the light transmittance adjusting thin film 150 includes the diffraction pattern formed on the diffraction optical element layer 130, the light transmittance adjusting thin film 150, and the above. A specific image can be realized by the difference in the transmittance with the diffractive optical element layer 130. As a result, the semitransparent anti-counterfeit film 100 can determine the presence or absence of counterfeiting using the specific image.

As a result, the semi-transmissive anti-counterfeit film 100 can embody a hologram on its upper part while simultaneously embodying a specific image on its lower part.

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

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

Referring to FIG. 4, the semi-transmissive anti-counterfeit 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 in which a part of incident light incident from the outside has passed through the light transmittance adjusting thin film 150. As a result, the semi-transmissive anti-counterfeit film 100 makes the information stored in the QR pattern layer 120 located below the bonding layer 170 recognizable. That is, the QR scanner (not shown) can easily track and manage the object by scanning the QR pattern layer 120 using the information, for example, a production lot.

As a result, the semi-transmissive anti-counterfeit film 100 embodies a specific image under the semitransparent film 100, and can read QR information formed under the semitransparent film 100.

Here, the light transmittance adjusting thin film 150 may have a thickness adjusted so as to have a maximum transmittance with respect to incident light having a wavelength of 500 to 600 nm. As a result, since the light transmittance adjusting thin film 150 has a relatively high light transmittance with respect to the incident light, the QR pattern layer 120 can be reached in a larger amount. Therefore, the QR scanner can effectively recognize the information stored in the QR pattern layer 120.

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

Referring to FIG. 5, the semi-transmissive anti-counterfeit 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 upper portion of the light transmittance adjusting thin film 150. The hologram pattern layer 180 uses reflected light in which a part of incident light incident from the outside is reflected from the light transmittance adjusting thin film 150. As a result, the semitransparent anti-counterfeit film 100 can embody a hologram on the upper portion thereof.

On the other hand, the QR pattern layer 120 is located below the base 110. The QR pattern layer 120 uses transmitted light in which a part of incident light incident from the outside has passed through the light transmittance adjusting thin film 150. As a result, the semi-transmissive anti-counterfeit film 100 makes the information stored in the QR pattern layer 120 located below the base 110 recognizable. That is, the QR scanner scans the QR pattern layer 120 to facilitate tracking and management of the object using the information, for example, a production lot.

FIG. 6 is a flowchart illustrating a method for manufacturing a transflective anti-counterfeit film according to an embodiment of the present invention.

Referring to FIGS. 1 and 6, in the method for producing a semitransmissive anti-counterfeit film according to an embodiment of the present invention, first, the diffraction optical element layer 130 is formed on one surface of the base 110 (S110). The diffraction optical element layer 130 having the diffraction pattern can be formed by a hot embossing step, a nanoimprinting step, or a transfer printing step.

Subsequently, the light transmittance adjusting thin film 150 that reflects and transmits the light incident from the outside is formed along the profile of the diffraction pattern (S130). The light transmittance adjusting thin film 150 can be formed by an atomic layer deposition step, a sputtering step, or an ion beam step.

The light transmittance adjusting thin film 150 can be formed by using a light-reflecting metal substance such as gold, silver, or aluminum. The light transmittance adjusting thin film 150 can be formed so as to have a thickness of 1 nm to 4 nm.

On the other hand, an information pattern layer such as the QR pattern layer 120 is formed on the other surface of the base 110. In contrast to this, an information pattern layer such as the hologram pattern layer 180 (see FIG. 5) is formed on a separate base.

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

FIG. 7A is a photograph of a hologram taken as a comparative example. FIG. 7B is a photograph of a transflective anti-counterfeit film having the diffractive optical element of the present invention.

Referring to FIGS. 7A and 7B, the hologram is a semi-transmissive anti-counterfeit film having the diffractive optical element of the present invention, whereas the interference fringes are periodically and iteratively formed. Can be confirmed to have a structure in which irregular stripes are formed as multiple layers.

FIG. 8 is a cross-sectional view for explaining the phase difference of light transmitted through the diffraction pattern included in the transmission type anti-counterfeit 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 the following mathematics. It seems to be Equation 1.

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

An image for authenticity determination can be realized from the diffraction pattern using the phase difference.

FIG. 9 is a cross-sectional view for explaining the phase difference of the light transmitted through the diffraction pattern included in the reflection type anti-counterfeit film.

With reference to FIG. 9, when there is a height difference h between the diffraction patterns and the diffraction pattern has n _p (= 1 + p), the phase difference (φ _{1 −} φ ₂ ) at different positions is the following mathematics. It looks like Equation 2.

_{Φ 1 '-Φ 2' = -k} 0 × 2h '( Equation 2)
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.

An image for authenticity determination can be realized from the diffraction pattern using the phase difference.

Although the present invention has been illustrated and described with reference to desirable examples as described above, the present invention is not limited to the above-mentioned examples and is ordinary knowledge in the technical field to which the invention belongs within the range not deviating from the technical idea of the present invention. Various modifications and changes are possible depending on the person who has. Such modifications and modifications are included in the appended claims.

100 Semi-transmissive anti-counterfeit film 110 Base 130 Diffractive optical element layer 150 Light transmittance adjustment thin film 170 Bonding layer 190 Flattening layer

Claims (5)

With the base
A diffractive optical element layer provided on the base and having a diffraction pattern for embodying an image for authenticity determination,
A light transmittance adjusting thin film formed on the diffractive optical element layer along the profile of the diffraction pattern and capable of partially reflecting and transmitting incident light.
Includes a QR pattern layer containing QR information provided at the bottom of the base.
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, and an image for authenticity determination toward both the upper part and the lower part of the base. Can be embodied,
A semi-transmissive anti-counterfeit film, characterized in that the light transmittance adjusting thin film has a thickness adjusted so as to have maximum transmittance with respect to incident light having a wavelength of 500 to 600 nm. The transflective anti-counterfeit film according to claim 1, wherein the light transmittance adjusting thin film contains at least one selected from a group of light-reflecting metals composed of gold, silver and aluminum. The semi-transmissive anti-counterfeit film according to claim 1 or 2, further comprising a hologram pattern layer provided on the light transmittance adjusting thin film. The third aspect of claim 3, further comprising a transparent bonding layer sandwiched between the light transmittance adjusting thin film and the hologram pattern layer and mutually bonding the light transmittance adjusting thin film and the hologram pattern layer. Semi-transmissive anti-counterfeit film. A flattening layer provided on the upper part of the light transmittance adjusting thin film,
Claim 1 or claim 1, further comprising a bonding layer sandwiched between the light transmittance adjusting thin film and the flattening layer, and mutually bonding the flattening layer and the light transmittance adjusting thin film. 2. The transflective anti-counterfeit film according to 2.