KR20210073138A - Security film and security product comprising the same - Google Patents

Abstract

Disclosed is a security film, comprising: a substrate; a first color conversion layer and a second color conversion layer respectively formed in a first region and a second region of the substrate; and a printed layer formed in a third region disposed adjacent to the first region or the second region. At a first viewing angle, the first region and the third region are observed as a first color, and at a second viewing angle, the second region and the third region are observed as the first color. The security film according to the present invention has an effect of providing a visual effect in which a pattern of the first color is moved, enlarged or reduced according to the viewing angle.

Description

Security film and security product including same {SECURITY FILM AND SECURITY PRODUCT COMPRISING THE SAME}

The present invention relates to a security film and a security product including the same, and more particularly, to a security film having a simple structure and providing a visual effect in which a pattern of a specific color moves, enlarges or reduces according to a viewing angle, and a security product including the same it's about

Security films such as banknotes, securities, gift certificates, passports, ID cards, and product labels are generally used to prevent forgery.

In addition, the number of cases in which such a security film is included in a product or its packaging for genuine authentication is increasing.

The security film is implemented in the form of being included in the security document or produced in the form of a film and attached to the surface of the security document, and usually has a special visual effect. Examples of such visual effects include holograms, moire magnification, fluorescence, parallax motion, and the like.

However, security film is always exposed to the risk of forgery, so the development of security film technology different from the existing general security film is required.

The color-shifting security element is an element that changes color depending on the viewing angle of the observer, and is being used in various ways because it can visually identify authenticity without using a separate authenticity identification device. A representative example of the color conversion security element is to be implemented with color-shifting, hologram, color-shifting ink, and the like.

The color conversion security element cannot be reproduced by simple scanning and copying, so it is a very effective technology in terms of preventing counterfeiting. However, as there are recent cases of forgery using similar films on the market, it is difficult to cope with advanced counterfeiting only with a simple color conversion effect. . Therefore, various security technologies have been proposed to counter such high-level forgery.

Such security technologies include a technology for strengthening security characteristics by combining a thin film interference layer and a diffraction pattern, a technology for disposing metal layers having different color tones to appear different color tones, etc. However, these technologies are manufactured due to the complicated implementation process. There are disadvantages in that the cost increases or the color conversion effect is insufficient.

Accordingly, there is a need for a color conversion security element technology capable of improving the anti-counterfeiting effect by providing various visual effects with a simple structure.

1. Korea Patent Publication No. 2004-0074073 (2004.08.21)

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to provide a security film with improved security by providing various visual effects with a simple structure and a security product including the same. Specifically, an object of the present invention is to provide a security film and a security product in which an effect of moving, expanding or reducing a pattern of a specific color according to a viewing angle is implemented.

The object of the present invention is not limited to the above, and other objects and advantages of the present invention not mentioned can be understood by the following description.

The security film according to the present invention includes a substrate, a first color conversion layer and a second color conversion layer respectively formed in the first region and the second region of the substrate, and a third region disposed adjacent to the first region or the second region and a printed layer formed on the , wherein the first region and the third region are observed with a first color at a first viewing angle, and the second region and the third region are observed with a first color at a second viewing angle .

The first color conversion layer and the second color conversion layer may be inverted from each other at the first viewing angle and the second viewing angle.

In addition, the first region, the second region, and the third region are arranged to implement a visual effect in which the pattern of the first color moves according to the viewing angle, or a visual effect in which the pattern of the first color is enlarged or reduced according to the viewing angle is implemented can be arranged as much as possible.

In addition, the first color conversion layer and the second color conversion layer may be formed by stacking a light absorption layer, a dielectric layer, and a reflective layer. In this case, the thickness of the dielectric layer in the first region and the second region may be different from each other.

In addition, the substrate may be laminated on the substrate in the order of a light absorbing layer, a dielectric layer and a reflective layer in the case of a transparent substrate, or may be laminated on the substrate in the order of a reflective layer, a dielectric layer and a light absorbing layer if the substrate is an opaque substrate.

In addition, the light absorption layer and the reflection layer may be formed in the third region.

The present invention discloses a security product comprising the security film according to any one of the above. The security film may be adhered to the security product through the adhesive layer.

According to an embodiment of the present invention, security is improved by providing various visual effects with a simple structure by forming a plurality of color conversion areas in which the same color as the color of the printing area appears at different viewing angles around the printing area of a specific color. It is effective in providing security film and security products. Specifically, an effect in which a pattern of a specific color moves or is enlarged or reduced according to a viewing angle may be implemented.

However, the effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description.

1 is a cross-sectional view of a security film according to an embodiment of the present invention.
2 and 3 are views for explaining a visual effect when the security film according to the present invention is observed from various directions.
4 and 5 are flowcharts illustrating an embodiment of a method for manufacturing a security film according to the present invention.
6 and 7 are flowcharts showing a modified example of the method for manufacturing a security film according to the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art. The embodiments presented below may be modified in various other forms, and the scope of the present invention is not limited to the following embodiments, and all changes, equivalents or substitutes included in the spirit and scope of the present invention should be understood as including

Like reference numerals are used for like elements in describing the accompanying drawings. In the accompanying drawings, the dimensions of the structures may be enlarged or reduced than in reality in order to help a clear understanding of the present invention.

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention.

In this specification, it should be understood that terms such as “comprise” or “have” specify the presence of the listed features, and do not preclude the possibility of the presence or addition of one or more other features. In this specification, the term “and/or” is used only to distinguish one feature from another to describe the listed features, and these features are not limited by these terms. Where it is described in the following description that a first feature is connected, coupled or connected with a second feature, this does not exclude that a third feature may be described between the first feature and the second feature.

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

1 is a cross-sectional view of a security film showing an embodiment according to the present invention.

Referring to FIG. 1 , a security film 100 according to the present invention includes a substrate 10 , a light absorption layer 20 , a printing layer 30 , a dielectric layer 50 , and a reflective layer 80 . The light absorption layer 20 , the dielectric layer 50 , and the reflective layer 80 are sequentially stacked to form a color conversion layer.

The substrate 10 may be a transparent substrate having transparency. Alternatively, as long as the surface roughness has a low surface characteristic, it may be used without being greatly limited. Specifically, polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polystyrene, acrylic resin, polyvinyl chloride (PC), glycol azide-polyester, acrylic It may be at least one selected from the group consisting of ronitrile-butadiene-styrene (ABS) and mixtures thereof, but is not limited thereto. More specifically, it may be transparent polycarbonate or transparent polyethylene terephthalate.

The light absorption layer 20 is formed on the entire surface of the substrate 10 and may be made of any light absorption material having desired light absorption characteristics.

The thickness of the light absorption layer 20 may have a thickness in the range of 1 to 50 µm, preferably 3 to 15 µm, depending on a desired color change effect. Such a light absorption layer may be formed of a single material, may have a combination and arrangement of various materials, and may have the same or different physical thicknesses.

In addition, the light absorption layer 20 is selected from the group consisting of Cr, Al, Cu, Co, Ni, Zn, Sn, Ag, Pd, Pt, Ti, V, Fe, W, Mo, Rh, Nb, or a combination thereof. can be used by Among them, it is more preferable to use Cr in consideration of the light absorption effect and adhesion to other metal layers. The transmittance of the light absorption layer may be in the range of 30% to 65%.

The printed layer 30 is formed on a portion of the light absorption layer 20 to form a pattern. At this time, the shape of the printed pattern is not particularly limited, and may be formed in various shapes such as a circle, a triangle, a trapezoid, a polygon, or a wavy shape. The printing layer 30 may be formed of ink of a specific color.

The dielectric layer 50 may be formed on the upper surface of the light absorption layer 20 on which the printed layer 30 is not formed. The dielectric layer 50 may _{be vacuum-deposited and coated with a silicon oxide film (SiO 2} ), and various color conversion effects may be obtained by controlling its thickness in a range of approximately 200 to 550 nm. The thickness of the dielectric layer 50 may vary depending on a color to be expressed.

The dielectric layer 50 may be formed to have a different thickness for each region. For example, as shown in FIG. 1 , dielectric layers 50 having different thicknesses may be formed in the first and second regions on the left and right sides of the third region where the printed layer 30 is formed. To this end, the first dielectric layer 51 and the second dielectric layer 52 are stacked in the second region where the relatively thick dielectric layer is formed, and the second dielectric layer ( 52) can be formed. In this case, the first dielectric layer 51 and the second dielectric layer 52 may be formed of the same material. For example, all of them may be a silicon oxide film.

The thickness of the dielectric layer 50 may be formed so that the color observed in the first area or the second area is the same as the color of the third area (the area in which the printed layer 30 is formed) at a specific viewing angle. For example, the thickness of the dielectric layer 50 formed in the first region is the same as the color observed in the first region when the security film 100 is viewed from the vertical direction is the same as the color of the third region, and when the viewing angle is changed It may be color-converted and set to a thickness different from the color of the third region. In addition, the thickness of the dielectric layer 50 formed in the second region is different from the color of the third region in which the printed layer 30 is formed so that the color observed in the second region when the security film 100 is viewed from a vertical direction is different from that of the third region in which the printed layer 30 is formed. , when the viewing angle is changed, the thickness may be set to be the same as the color of the third region by color conversion.

The reflective layer 80 may be made of various reflective materials, and a metal, a metal alloy, or a combination thereof having a high reflectance and easy deposition may be used. Preferably, aluminum (Al), which is easily formed by vacuum deposition and has high reflectance, may be used. The reflective layer 80 may have a thickness in the range of 1 to 200 nm, preferably 10 to 100 nm.

The reflective layer 80 may be formed only on the dielectric layer 50 , or may also be formed on the printed layer 30 . When the reflective layer 80 is also formed on the printed layer 30, the color of the third area where the printed layer 30 is formed and the first or second area on which the color conversion layer is formed can be adjusted to look the same. can

Although only one of the first to third regions is illustrated in FIG. 1 , the security film of the present invention may include a plurality of first to third regions. The number, formation pattern, arrangement, etc. of the first to third regions may be variously designed according to the implemented visual effect. For example, the first to third regions shown in FIG. 1 may be repeatedly formed while maintaining the order, or may be repeatedly formed in a different order. A predetermined pattern may be formed by repeatedly arranging groups including at least one of the first to third regions according to a series of rules.

In the security film according to an embodiment of the present invention, color inversion may occur in the first region and the second region by color conversion according to the viewing angle. That is, in the first area and the second area in which the color conversion layer is formed, the color conversion layer is visually recognized as the first color and the second color at a specific viewing angle of the user, and when the viewing angle is changed to a specific viewing angle, the first area and the second area These may be visually recognized as the second color and the first color, respectively. That is, the two colors may be reversed depending on the viewing angle viewed by the user, resulting in color inversion. In this case, the color of the third area in which the print layer 30 is formed may be the same as the first color or the second color. As a result, a visual effect in which the pattern moves, enlarges, or reduces according to the viewing angle is implemented, thereby further improving the security of the security film.

2 is a view for explaining the visual effect of a security film according to an embodiment of the present invention, wherein the first region is indicated by '1', the second region is indicated by '2', and the third region is indicated by '3'. It was. Fig. 2(a) is a result of observing the security film from a first viewing angle (eg, the front side), and Fig. 2(b) is a result of observing the security film from a second viewing angle (eg, a side surface). The direction in which the security film 100 is viewed may be viewed from the direction of the substrate.

The first area and the second area are areas in which the color conversion layer is formed, and the third area is an area in which the printing layer 30 is formed. It is assumed that the third region is printed with ink such that it is observed at the first viewing angle with the same color as that of the first region. Alternatively, the thickness of the dielectric layer formed in the first region may be adjusted so that the same color is observed in consideration of the ink color.

As shown in FIG. 2 , at the first viewing angle, the first region and the third region may be observed with the same first color, and the second region may be observed with a second color different from the first color. Also, as the viewing angle is changed from the first viewing angle to the second viewing angle by tilting the security film or viewing from the side, the colors of the first region and the second region are reversed. By such color inversion, the first region is observed as the second color and the second region is observed as the first color. Accordingly, the effect of moving the pattern of the second color according to the viewing angle may be obtained.

3 is a view for explaining a visual effect of a security film according to another embodiment of the present invention. In the embodiment of FIG. 3 , a pattern arranged to surround the third region in the order of the first region and the second region or the second region and the first region is repeatedly formed. Fig. 3(a) is a result of observing the security film from a first viewing angle (eg, the front side), and Fig. 3(b) is a result of observing the security film from a second viewing angle (eg, a side surface). The first area and the second area are areas in which the color conversion layer is formed, and the third area is an area in which the printing layer 30 is formed. Also in FIG. 3 , it is assumed that the color of the ink layer or the thickness of the dielectric layer is adjusted so that the colors of the first region and the third region are the same at the first viewing angle.

As shown in FIG. 3 , at the first viewing angle, the first region and the third region may be equally observed as the first color, and the second region may be observed as the second color. Therefore, a relatively large rectangle is observed on the left side and a relatively small rectangle on the right side based on the rectangle observed as the second color.

Also, as the viewing angle is changed from the first viewing angle to the second viewing angle by tilting the security film or viewing from the side, the colors of the first region and the second region are reversed. By such color inversion, the first region is observed as the second color and the second region is observed as the first color. As a result, a relatively small rectangle is observed on the left side and a relatively large rectangle is observed on the right side with respect to the rectangle observed as the second color. That is, according to the present embodiment, the effect that the pattern of the second color is enlarged or reduced according to the viewing angle can be obtained.

As shown in FIGS. 2 and 3 , various patterns are formed by variously combining the first to third regions, and thus various visual effects can be obtained. In particular, since a visual effect in which a pattern is moved or enlarged or reduced according to a viewing angle is implemented, it is possible to easily check whether forgery or not with the naked eye without a special tool.

4 and 5 are flowcharts and cross-sectional views illustrating a method of manufacturing a security film according to an embodiment of the present invention. 4 and 5, the security film according to an embodiment of the present invention includes a substrate preparation step (step S10); light absorption layer forming step (step S20); Printing layer forming step (S30 step); a first masking step (step S40); forming a first dielectric layer (step S50); a second masking step (step S60); forming a second dielectric layer (step S70); It may be manufactured by the first and second masking removal steps (step S80) and the reflective layer forming step (step S90).

The substrate preparation step (step S10 ) is a step of preparing the above-described substrate 10 .

The light absorption layer forming step (step S20 ) is a step of forming the light absorption layer 20 on the surface of the prepared substrate.

The printed layer forming step (S30 step) is a step of forming a printed layer 30 pattern in a partial area (third area) of the light absorption layer 20 .

The first masking step (step S40 ) is a step of forming the first masking 40 on the upper surface of the printed layer 30 pattern. A first masking 40 is used to remove a subsequently deposited dielectric layer.

The first dielectric layer forming step (S50 step) is a step of forming the first dielectric layer 51 having a first thickness. The first thickness may be determined in consideration of the color of the first region, and the color of the first region may be selected to be the same color as the color of the printing layer 30 at the first viewing angle.

The second masking step (step S60 ) is a step of forming the second masking 60 on the first dielectric layer 51 formed in the first region. A second masking 60 is used to remove the subsequently deposited second dielectric layer 52 . The second masking 60 may also be formed on the printed layer 30 .

The second dielectric layer forming step (S70 step) is a step of forming the second dielectric layer 52 so that the thickness of the dielectric layer in the second region becomes the second thickness. That is, in the second region, the first dielectric layer 51 and the second dielectric layer 52 may be stacked to form a dielectric layer having a second thickness. The second thickness may be selected such that the color of the second region at a specific viewing angle is the same as the color of the third region in which the printed layer 30 is formed.

The first and second masking removal steps (step S80 ) are steps of removing the first masking 40 and the second masking 60 , and in this process, the dielectric layer deposited on the first and second masks 40 and 60 . (51, 52) can also be removed together.

Next, the reflective layer forming step (step S90) is performed to form the reflective layer 80 . The reflective layer 80 may be formed over the entire first to third regions, and may be formed using a conventional vacuum deposition method.

4 and 5, while simultaneously removing the first masking 40 and the second masking 60, the masking removal step may be performed separately. The sequence of this manufacturing method is shown in FIGS. 6 and 7 .

6 and 7, the substrate preparation step (step S10), the light absorption layer forming step (S20 step), the printing layer forming step (S30 step); a first masking step (step S40); forming a first dielectric layer (step S50); a first masking removal step (step S81); a second masking step (step S60); forming a second dielectric layer (step S70); The security film may be manufactured by the second masking removal step (step S82) and the reflective layer forming step (step S90). That is, unlike the embodiments of FIGS. 4 and 5 in which the first masking 40 and the second masking 60 are simultaneously removed in step S80, this embodiment removes the first masking once after forming the first dielectric layer ( S81), there is a difference in that after forming the second dielectric layer, the step of removing the second masking (S82) is performed.

In the above embodiment, it is assumed that the observation is performed from the lower portion of the security film 100 , that is, from the direction of the substrate. However, unlike this, the same applies when viewing from the upper portion of the security film 100 , that is, from the direction in which the printed layer 30 is formed. Visual effects can be created. To this end, the formation order of the light absorption layer 20 and the reflective layer 80 may be changed. That is, after the reflective layer 80 is first formed on the substrate 10 , the printed layer 30 and the dielectric layer 50 may be formed, and finally the light absorption layer 20 may be formed. In this case, the base 10 may use an unknown base material.

In addition, although the embodiment has been described as forming a color conversion layer by laminating a light absorption layer, a dielectric layer, and a reflective layer, the scope of the present invention is not limited thereto. For example, the color conversion layer may be formed using a color conversion ink. In this case, the color conversion layer formed in the first area and the color conversion layer formed in the second area may use a color conversion ink having a color reversal effect according to a viewing angle.

The security film 100 according to the embodiment of the present invention can be applied to security products such as various security documents or products. The security film 100 may be inserted into a security product in the form of a silver wire or manufactured in the form of a sticker and attached to the surface. To this end, the security film 100 may further include an adhesive layer (not shown). For example, the security film 100 may be configured to be attached to the surface of the security product by forming an adhesive layer on one surface or the other surface on which the printed layer is formed.

Although described with reference to the above-limited embodiments and drawings, it will be apparent to those skilled in the art that these are only embodiments, and that various modifications are possible within the scope of the technical idea of the present invention. For example, all or part of each embodiment may be selectively combined and implemented, thereby providing various visual effects not specifically described in the embodiments. Accordingly, the protection scope of the present invention should be defined by the description of the claims and their equivalents.

100: security film
10: description
20: light absorption layer
30: print layer
50: dielectric layer
80: reflective layer

Claims (11)

materials;
a first color conversion layer and a second color conversion layer respectively formed in the first region and the second region of the substrate;
a printed layer formed in a third region disposed adjacent to the first region or the second region;
including,
At the first viewing angle, the first region and the third region are observed as a first color,
The security film, characterized in that at the second viewing angle, the second region and the third region are observed with the first color. According to claim 1,
The security film, characterized in that the first color conversion layer and the second color conversion layer are inverted from each other at the first viewing angle and the second viewing angle. According to claim 1,
The security film, characterized in that the first region, the second region, and the third region are arranged to implement a visual effect in which the pattern of the first color moves according to a viewing angle. According to claim 1,
The security film, characterized in that the first region, the second region, and the third region are arranged to realize a visual effect in which the pattern of the first color is enlarged or reduced according to a viewing angle. According to claim 1,
The first color conversion layer and the second color conversion layer are formed by laminating a light absorption layer, a dielectric layer, and a reflective layer. 6. The method of claim 5,
A security film, characterized in that the thickness of the dielectric layer in the first region and the second region is different from each other. 6. The method of claim 5,
wherein the substrate is a transparent substrate, and is laminated on the substrate in order of a light absorption layer, a dielectric layer, and a reflective layer. 6. The method of claim 5,
wherein the substrate is an opaque substrate, and is laminated on the substrate in order of a reflective layer, a dielectric layer, and a light absorption layer. 6. The method of claim 5,
The security film, characterized in that the light absorption layer and the reflection layer are also formed in the third region. A security product comprising the security film of any one of claims 1 to 9. 11. The method of claim 10,
The security film is a security product, characterized in that it is adhered through an adhesive layer.

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