阅读说明：本技术 半透过型防伪膜 (Semi-permeable anti-counterfeiting film ) 是由 崔眞荣 李容准 朴范圭 于 2019-03-29 设计创作，主要内容包括：半透过型防伪膜包括：基底、位于所述基底上且具有用于形成真伪判定用图像的衍射图案的衍射性光学元件层及沿着所述衍射图案的轮廓形成于所述衍射性光学元件层且能够使入射的入射光部分反射及部分透过的透光度调节薄膜。因此,半透过型防伪膜可通过使入射光反射及透过以在膜两侧形成衍射图像。本发明的半透过型防伪膜能够轻易地呈现复杂的图像,能够不规则地呈现具有随机形状或大小的衍射图案。并且,能够利用具有多种波长及相位的光轻易地呈现具有多种颜色的图像。(The semi-permeable type anti-counterfeiting film comprises: the optical device includes a substrate, a diffractive optical element layer located on the substrate and having a diffraction pattern for forming an image for authenticity determination, and a transmittance adjusting film formed on the diffractive optical element layer along a profile of the diffraction pattern and capable of partially reflecting and partially transmitting incident light. Accordingly, the semi-transmissive type anti-counterfeiting film can form diffraction images on both sides of the film by reflecting and transmitting incident light. The semi-permeable anti-counterfeiting film can easily present complex images and can irregularly present diffraction patterns with random shapes or sizes. Further, images having a plurality of colors can be easily expressed by light having a plurality of wavelengths and phases.)

1. A semi-permeable anti-counterfeiting film, which is characterized by comprising:

a substrate;

a diffractive optical element layer which is provided on the base and has a diffraction pattern for forming an image for authenticity judgment; and

and a transmittance adjusting film formed on the diffractive optical element layer along the profile of the diffraction pattern, the transmittance adjusting film being capable of partially reflecting and partially transmitting incident light.

2. The semi-permeable anti-counterfeiting film according to claim 1, wherein:

the transmittance adjusting film has a transmittance in a range of 40 to 60% with respect to light having a wavelength in a visible light range, and can form an image for authenticity judgment on the upper and lower portions of the base.

3. The semi-permeable anti-counterfeiting film according to claim 1, wherein:

the transmittance adjusting film contains at least one selected from a group of light-reflecting metals consisting of gold, silver, and aluminum.

4. The semi-permeable anti-counterfeiting film according to claim 1, wherein:

the upper or lower portion of the substrate further includes at least one information pattern portion storing information.

5. The semi-permeable anti-counterfeiting film according to claim 4, wherein:

the transmittance adjustment film has a thickness adjusted to have a maximum transmittance for incident light having a wavelength of 500 to 600 nm.

6. The semi-permeable anti-counterfeiting film according to claim 5, wherein:

the information pattern portion includes a QR pattern layer located under the substrate and containing QR information.

7. The semi-permeable anti-counterfeiting film according to claim 4, wherein:

the transmittance adjusting film has a thickness adjusted to have a transmittance of less than 50% for incident light having a wavelength of 500 to 600 nm.

8. The semipermeable anti-counterfeiting film according to claim 7, wherein the information pattern part comprises:

a hologram pattern layer on the transmittance adjustment film and using incident light having a wavelength of 500 to 600nm as reproduction light.

9. The semi-permeable anti-counterfeiting film according to claim 8, further comprising:

and a transparent adhesive layer interposed between the transmittance adjustment film and the hologram pattern layer and adhering the transmittance adjustment film and the hologram pattern layer to each other.

10. The semi-permeable anti-counterfeiting film according to claim 4, wherein:

the transmittance adjustment film has a transmittance in the range of 40 to 60% for light having a wavelength in the visible ray region,

the information pattern part includes a hologram pattern layer formed on an upper portion of the substrate and a QR pattern layer formed on a lower portion of the substrate.

11. The semi-permeable anti-counterfeiting film according to claim 1, further comprising:

a planarization layer on the transmittance adjustment film; and

and an adhesive layer interposed between the transmittance adjustment film and the planarization layer and adhering the planarization layer and the transmittance adjustment film to each other.

Technical Field

The invention relates to a semi-permeable anti-counterfeiting film. More particularly, the present invention relates to a semi-permeable anti-counterfeit film capable of presenting an image for authenticity judgment using an image for authenticity judgment.

Background

The counterfeiting of valuable articles such as software, CDs, DVDs, securities, foreign wine, medicines, etc. has become a very big social problem. The counterfeited products are mostly of low quality, so that the corresponding enterprises suffer significant losses due to the counterfeiting, such as losing the credit of accumulating a great deal of effort. In order to solve such a forgery problem, many companies have attempted to prevent the distribution of counterfeits by using a technique that is difficult to forge products, a technique for determining genuine products and counterfeit products, and the like.

The most typical of products to be protected against counterfeiting is a hologram (hologram). In order to design a hologram, the hologram is designed by using an interference phenomenon between object light reflected from an object and reference light by the object light and the reference light irradiated to the object by a beam splitter.

The hologram is a medium in which interference fringes for reproducing a stereoscopic image are recorded, and is produced by using the principle of holography. Therefore, the hologram can present a specific image by irradiating the interference pattern with reproduction light having the same vibration frequency, wavelength, and phase as the reference light at a specific angle. Also, the color or morphology of the reflected light may vary with viewing angle.

However, information that can be recorded by a hologram is limited, and thus there is a problem in that it is difficult to manufacture a fine hologram. Also, there is a limitation that the reproduction light must have the same phase, wavelength, and vibration frequency as the reference light. The problem of easy replication is exacerbated as holograms begin to be replicated by hologram replication devices such as digital scanners. Further, the hologram pattern constituting the hologram has a predetermined shape and regularity.

Therefore, a technique of recording information on the anti-counterfeit film by the nanoimprint method has recently appeared. The nanoimprint method is a method of forming a diffraction pattern on a security film using a mold having a nano pattern, and has been widely used recently because of low cost and capability of recording a large amount of information.

In general, the anti-counterfeiting film diffracts laser light that is irradiated in a straight line direction and passes through the inside in a predetermined direction. Therefore, the laser beam irradiated to the anti-counterfeit film in the straight direction passes through the anti-counterfeit film and is diffracted by the diffraction pattern to form the anti-counterfeit pattern.

However, the transmission type anti-counterfeiting film has a problem that it is difficult to apply the film to products having various shapes including three-dimensional objects. Further, since the transmission type anti-counterfeiting film itself must ensure light transmission as a whole, there is a limitation in the material constituting the transmission type anti-counterfeiting film.

Disclosure of Invention

Technical problem

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

Technical scheme

To achieve the above object, a semi-permeable anti-counterfeiting film according to an embodiment of the present invention includes: the optical device includes a substrate, a diffractive optical element layer located on the substrate and having a diffraction pattern for presenting an image for authenticity judgment, and a transmittance adjusting film formed on the diffractive optical element layer along a profile of the diffraction pattern and capable of partially reflecting and partially transmitting incident light.

According to one embodiment of the present invention, the transmittance adjustment film has a transmittance in a range of 40 to 60% for light having a wavelength in a visible light range, and can present an image for authenticity judgment to the upper and lower portions of the substrate.

According to an embodiment of the present invention, the transmittance adjustment film may contain at least one selected from a group of light-reflective metals consisting of gold, silver, and aluminum.

According to an embodiment of the present invention, the upper or lower portion of the substrate may further include at least one information pattern portion storing information.

Wherein the transmittance adjustment film may have a thickness adjusted to have a maximum transmittance for incident light having a wavelength of 500 to 600 nm.

Wherein the information pattern part may include a QR pattern layer located under the substrate and containing QR information.

In addition, the transmittance adjustment film may have a thickness adjusted to have a transmittance of less than 50% for incident light having a wavelength of 500 to 600 nm.

In this case, the information pattern part may include a hologram pattern layer on the transmittance adjustment film and using incident light having a wavelength of 500 to 600nm as reproduction light. And may further include a transparent adhesive layer interposed between the transmittance adjustment film and the hologram pattern layer and adhering the transmittance adjustment film and the hologram pattern layer to each other.

In addition, the transmittance adjustment film has a transmittance in a range of 40 to 60% for light having a wavelength of a visible ray region, and the information pattern part may include a hologram pattern layer formed at an upper portion of the substrate and a QR pattern layer formed at a lower portion of the substrate.

According to an embodiment of the present invention, a planarization layer on the transmittance adjustment film may be further included; and a pasting layer which is arranged between the transmittance adjusting film and the planarization layer and mutually pastes the planarization layer and the transmittance adjusting film.

Technical effects

The semi-transmissive anti-counterfeiting film according to the embodiment of the present invention has a diffractive optical element that can replace a hologram, and thus can exhibit a nano-sized micro pattern. Thus, a complicated image can be easily presented, and a diffraction pattern having a random shape or size can be irregularly presented. Further, images having a plurality of colors can be easily expressed by light having a plurality of wavelengths and phases.

In addition, unlike a conventional transmission-type anti-counterfeiting film, images for forgery determination can be displayed on the upper and lower surfaces of the base. Therefore, the authenticity of the object can be easily determined regardless of the degree of light transmittance of the object.

Further, since another hologram pattern layer or QR pattern layer is provided, forgery can be determined more accurately, or additional information for tracking and managing a product can be stored.

In addition, because the semi-permeable anti-counterfeiting film further comprises the flattening layer and the pasting layer, the thickness of the semi-permeable anti-counterfeiting film can be effectively adjusted along with the change of the thickness of the pasting layer.

Drawings

Fig. 1 is a sectional view illustrating a semi-permeable type anti-counterfeiting film according to an embodiment of the present invention;

fig. 2 is a graph illustrating transmittance corresponding to the thickness of the transmittance adjustment film of fig. 1;

fig. 3 is a sectional view illustrating a semi-permeable anti-counterfeiting film according to another embodiment of the present invention;

fig. 4 is a sectional view illustrating a semi-permeable anti-counterfeiting film according to still another embodiment of the present invention;

fig. 5 is a sectional view illustrating a semi-permeable anti-counterfeiting film according to still another embodiment of the present invention;

fig. 6 is a flowchart illustrating a method of manufacturing the semi-permeable anti-counterfeiting film of the embodiment of the present invention;

FIG. 7a is a photograph of a hologram taken as a comparative example;

FIG. 7b is a photograph of the semi-transparent type anti-counterfeiting film having the diffractive optical element of the present invention;

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

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

Description of the reference numerals

100: semi-permeable type anti-counterfeiting film 110: substrate

130: diffractive optical element layer 150: transmittance adjusting film

170: adhesive layer 190: planarization layer

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, the present invention is not limited to the specific embodiments disclosed, and therefore, the present invention should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. In the drawings, the size and the amount of an object are shown enlarged or reduced from the actual size for clarity of the present invention.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The term is used for the purpose of distinguishing one component from another. For example, a first component may be named as a second component, or a second component may be named as a first component similarly, without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular references also include plural references without explicit recitation herein. The terms "comprising" or "having" and the like in the present application should be interpreted as referring to the presence of the features, steps, functions, constituent elements, or combinations thereof described in the specification, and should not be interpreted as excluding other features, steps, functions, constituent elements, or combinations thereof.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the relevant art and should not be interpreted in an ideal or excessive formal sense unless explicitly defined by the present application.

Fig. 1 is a sectional view illustrating a semi-permeable anti-counterfeiting film according to an embodiment of the present invention.

Referring to fig. 1, a semi-transparent type anti-counterfeiting film 100 according to an embodiment of the present invention includes a substrate 110, a diffractive optical element layer 130, and a transmittance adjustment film 150. In the semi-transmissive anti-counterfeiting film 100, part of LED light or laser light incident from the outside is reflected by the transmittance adjustment film 150, and the other part is transmitted. Accordingly, a specific image can be presented to the upper and lower portions of the substrate 110. Here, the specific image may correspond to an image for authenticity judgment. For example, the specific image may include a trademark or logo (logo) of a manufacturing company of the object whose authenticity needs to be determined.

The substrate 110 may be made of a high molecular substance. For example, the substrate 110 may be made of PET. And a two-sided adhesive tape (not shown) may be formed on the lower surface of the base 110 so that the base 110 can be adhered to a specific product.

The substrate 110 has a diffractive optical element layer 130 thereon.

A diffraction pattern is formed on 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 may be defined as a pattern for rendering the diffraction characteristics of a particular image with a design algorithm that includes fourier transform and inverse fourier transform processes.

The diffraction pattern may be formed by a thermal imprint process, a nanoimprint process, or a transfer process.

The transmittance adjustment film 150 is formed along the profile of the diffraction pattern. For this, the transmittance adjustment film 150 may be formed to have a uniform thickness. The transmittance adjustment film 150 may reflect a part of the light incident from the outside to present a specific image on an upper portion thereof, and in addition, transmit a part of the external light to present a specific image on a lower portion thereof. Therefore, the semi-permeable anti-counterfeit film 100 including the transmittance adjustment film 150 can be used regardless of the transmittance of the object for authentication determination.

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

The transmittance of the transmittance adjusting film 150 can be adjusted by using the thickness thereof. For example, the transmittance adjustment film 150 may have a thickness of 1nm to 4 nm.

The phase of the light reflected by the surface of the light transmittance adjusting film 150 is different in the light transmittance adjusting film 150 depending on the difference of the diffraction pattern. The reflected light may interfere with each other to present a particular diffraction image.

Fig. 2 is a graph illustrating transmittance corresponding to the thickness of the transmittance adjustment film of fig. 1.

Referring to fig. 2, the transmittance of the transmittance adjustment film 150 is shown for each thickness according to the wavelength in the case where the film is made of gold.

In the case where the transmittance adjustment film 150 is made of gold, the transmittance adjustment film 150 may have a thickness of 2 to 4 nm. Therefore, the transmittance adjustment film may have a transmittance of 40 to 60% in a visible ray region.

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

According to an embodiment of the present invention, the semi-permeable anti-counterfeiting film 100 may be attached to various shapes of objects including three-dimensional objects, unlike the existing transmission type anti-counterfeiting film. That is, since the conventional transmission type forgery prevention film presents an image for authenticity judgment by using light transmitted through the product, it is difficult to use the transmission type forgery prevention film when the object is opaque.

On the other hand, the semi-permeable anti-counterfeiting 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 attached object.

According to an embodiment of the present invention, the semi-transparent anti-counterfeiting film 100 further includes a planarization layer 190 and an adhesive layer 170.

The planarization layer 190 is positioned on the transmittance adjustment film 150. The planarization layer 190 removes a step formed in the diffraction pattern and planarizes the entire surface thereof.

The planarization layer 190 is disposed to cover the transmittance adjustment film 150. Accordingly, the planarization layer 190 can protect the transmittance adjustment film 150 and the diffractive optical element layer 130 when external impact is applied. The flattening layer 190 covers the entire diffractive optical element layer 130, thereby suppressing the semipermeable anti-counterfeit film 100 from being duplicated.

The planarization layer 190 may be made of any one of transparent resins including polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), Polypropylene (PT), acrylic, and epoxy.

The adhesive layer 170 is interposed between the planarization layer and the transmittance adjustment film. The adhesive layer 170 adheres the planarization layer 190 and the transmittance adjustment film 150 to each other. The adhesive layer 170 may be formed through a lamination process. The adhesive layer 170 may adhere the planarization layer 190 and the transmittance adjustment film 150 to each other by cooling, for example.

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

Referring to fig. 3, the semi-transmissive anti-counterfeiting film 100 according to an embodiment of the present invention includes a substrate 110, a diffractive optical element layer 130, a transmittance adjustment film 150, and an information pattern part. The information pattern part may include, for example, a hologram pattern layer 180.

The hologram pattern layer 180 is positioned on the upper portion of the transmittance adjustment film 150. The hologram pattern layer 180 uses reflected light, a portion of which is reflected by the transmittance adjustment film 150, from incident light incident from the outside. Accordingly, the semi-transmissive anti-counterfeiting film 100 may present a hologram on the upper portion thereof.

In addition, a part of the incident light incident from the outside, which is transmitted through the transmittance adjustment film 150, may represent a specific image by a diffraction pattern formed in the diffractive optical element layer 130, a difference in refractive index between the transmittance adjustment film 150 and the diffractive optical element layer 130. Therefore, the semi-transmissive anti-counterfeiting film 100 can determine whether or not to be forged using the specific image.

As a result, the semi-transmissive anti-counterfeiting film 100 can represent a hologram on the upper portion thereof and a specific image on the lower portion thereof.

Wherein the transmittance adjustment film 150 may have a thickness adjusted to have a transmittance of less than 50% for incident light having a wavelength of 500 to 600 nm. Accordingly, the transmittance adjustment film 150 has a relatively high light reflectance to the incident light, and thus the light required for hologram rendering can reach the hologram pattern layer 180 more.

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

Referring to fig. 4, the semi-transmissive anti-counterfeiting film 100 according to an embodiment of the present invention may include a substrate 110, a diffractive optical element layer 130, a transmittance adjustment film 150, and an information pattern part. The information pattern portion may include, for example, a QR pattern layer 120.

The QR pattern layer 120 is positioned at a lower portion of the substrate 110. The QR pattern layer 120 uses a transmitted light, which is partially transmitted through the transmittance adjustment film 150, of an incident light incident from the outside. The semi-transparent type anti-counterfeiting film 100 thus enables identification of information stored in the QR pattern layer 120 located at the lower portion of the adhesive layer 170. That is, a QR scanner (not shown) can easily track and manage an object using the information, such as a production lot, by scanning the QR pattern layer 120.

As a result, the semi-transmissive anti-counterfeiting film 100 can read QR information located below the semi-transmissive anti-counterfeiting film while displaying a specific image on the lower portion thereof.

Wherein the transmittance adjustment film 150 may have a thickness adjusted to have a maximum transmittance for incident light having a wavelength of 500 to 600 nm. Therefore, the transmittance adjustment film 150 has a relatively high transmittance to the incident light, and a greater amount of light can reach the QR pattern layer 120. Accordingly, the QR scanner can effectively recognize information stored in the QR pattern layer 120.

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

Referring to fig. 5, the semi-transmissive anti-counterfeiting film 100 according to an embodiment of the present invention includes a substrate 110, a diffractive optical element layer 130, a transmittance adjustment film 150, and an information pattern part. The information pattern part may include, for example, a hologram pattern layer 180 and a QR pattern layer 120.

The hologram pattern layer 180 is positioned on the upper portion of the transmittance adjustment film 150. The hologram pattern layer 180 uses reflected light, a portion of which is reflected by the transmittance adjustment film 150, from incident light incident from the outside. Accordingly, the semi-transmissive anti-counterfeiting film 100 may present a hologram on the upper portion thereof.

In addition, the QR pattern layer 120 is positioned at a lower portion of the substrate 110. The QR pattern layer 120 uses a transmitted light, which is partially transmitted through the transmittance adjustment film 150, of an incident light incident from the outside. The semi-transparent type anti-counterfeiting film 100 thus enables identification of information stored in the QR pattern layer 120 located at the lower portion of the substrate 110. That is, the QR scanner may easily track and manage the object body using the information, such as the production lot, etc., by scanning the QR pattern layer 120.

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

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

Thereafter, a transmittance adjustment film 150 that reflects and transmits the light incident from the outside is formed along the profile of the diffraction pattern (S130). The transmittance adjustment film 150 may be formed through an atomic layer deposition process, a sputtering process, or an ion beam process.

The transmittance adjustment film 150 may be formed using a light-reflective metal substance such as gold, silver, or aluminum. The transmittance adjustment film 150 may be formed to have a thickness of 1nm to 4 nm.

In addition, an information pattern layer such as a QR pattern layer 120 is formed on the other surface of the substrate 110. Alternatively, an information pattern layer such as the hologram pattern layer 180 (refer to fig. 5) is formed on another substrate.

Thereafter, the information pattern layer is attached to the transmittance adjustment film 150. Thereby, the semi-transparent type anti-counterfeiting film 100 including the information pattern layer and the transmittance adjustment film 150 is manufactured.

Fig. 7a is a photograph of a hologram taken as a comparative example. Fig. 7b is a photograph of the semi-transparent type anti-counterfeiting film having the diffractive optical element of the present invention.

Referring to fig. 7a and 7b, it can be confirmed that interference patterns of the hologram are periodically and repeatedly formed, and on the contrary, the semi-transparent anti-counterfeiting film having the diffractive optical element according to the present invention has a structure in which a plurality of layers of irregular patterns are formed.

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

Referring to fig. 8, there is a height difference h between the diffraction patterns, and in the case where the diffraction patterns have np of 1+ p,

phase difference at different positions

As shown in the following mathematical formula 1.

Mathematical formula 1

φ₁-φ₂＝k₀×p×h

Wherein k is₀P is a difference larger than the refractive index of air 1, and h is a height difference of the diffraction pattern.

The phase difference can be used to present an image for authenticity judgment based on the diffraction pattern.

Fig. 9 is a surface view for explaining a phase difference of light reflected by a diffraction pattern included in the reflective anti-counterfeit film.

Referring to fig. 9, there is a height difference h between diffraction patterns having n_pIn the case of 1+ p, the total of p,

phase difference at different positions

As shown in the following mathematical formula 2.

Mathematical formula 2

φ₁′-φ₂′＝-k₀×2h

Wherein k is₀P is a difference larger than the refractive index of air 1, and h is a height difference of the diffraction pattern.

The phase difference can be used to present an image for authenticity judgment based on the diffraction pattern.

While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Such modifications and variations are to be considered as included within the scope of the present invention.