KR20190075270A - Color reversal security elements according to viewing angle - Google Patents

Abstract

The present invention relates to a color inversion security element according to a viewing angle and a manufacturing method thereof. The color inversion security element comprises: a substrate; and a color conversion optical layer formed on the substrate and including a first region formed of a convex pattern and a second region separated from the first region. The convex pattern is formed to satisfy a color inversion condition. According to the present invention, the two regions are recognized by different colors by the convex pattern, and color inversion of the colors of the two regions are inverted according to the viewing angle, so that the color inversion can be more dramatically recognized with naked eyes without any tools, thereby easily checking forgery and alternation.

Description

{COLOR REVERSAL SECURITY ELEMENTS ACCORDING TO VIEWING ANGLE}

The present invention relates to a security element for causing a color reversal in which colors of two regions are reversed according to a viewing angle, and a manufacturing method thereof.

Security products such as banknotes, securities, confidential documents, etc., have at least one security technology such as silver or chroma, color conversion ink, and hologram applied to prevent counterfeiting. Particularly, paper is provided with a transparent synthetic resin film such as polyester to prevent forgery by inserting a hidden line which is produced by cutting a strip of 1 to 5 mm.

In recent years, security elements have been developed that make it easy for the general public to check with the naked eye. In particular, color-shifting security elements change color depending on the viewer's angle, and use tools such as a magnifying glass or ultraviolet lamp And it is easy to confirm the authenticity even with the naked eye. In addition, the color conversion effect can not be reproduced by merely scanning and copying, which is a very effective technique for preventing forgery.

However, recently, counterfeit cases using similar films such as a beauty film and a stationary film have occurred, and it is difficult to cope with a high degree of counterfeiting only by a simple color conversion effect. Various security technologies have been proposed in order to cope with such counterfeiting. Such security techniques include a technique of enhancing security characteristics by combining a thin film interference layer and a diffraction pattern, a technique of disposing metal layers having different hues to produce different hues, and the like, There is a disadvantage in that the cost is increased or the color conversion effect is insufficient.

Therefore, there is a demand for a color conversion security technology that can improve not only the effect of causing color conversion but also the effect of preventing forgery by maximizing visual change at low cost.

KR 10-2004-0074073 A.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an image display apparatus and a display method thereof, in which a first area and a second area are visually recognized as a first color and a second color, And a color reversal in which the first area and the second area are reversed to the second color and the first color, respectively, and a manufacturing method thereof.

According to an aspect of the present invention, there is provided a substrate comprising: a substrate; And a color conversion optical layer formed on the substrate and including a first region formed of a convex pattern and a second region separated from the first region, wherein the convex pattern is formed so as to satisfy the color reversal condition, Wherein the color reversal condition is such that the first region and the second region of the color conversion optical layer are visually observed in a first hue and a second hue at a first viewing angle, A color reversal security element according to the viewing angle is provided, characterized in that the color reversal security element is reversed to the first color and is visible.

The convex pattern may be formed as an inclined surface having a specific angle to satisfy the color reversal condition at the first viewing angle or the second viewing angle.

The plurality of convex patterns may have the same inclined surface so that the color reversal occurs simultaneously at the first viewing angle or the second viewing angle.

An inflating agent is printed between the substrate and the color converting optical layer and the inflating agent expands when heat or heat and pressure are simultaneously applied so that the convex pattern is formed on the color converting optical layer.

The convex pattern may be formed by printing a water-soluble ink on a part of the base material, forming the color conversion optical layer, and then cutting out the water-soluble ink.

The color conversion optical layer may be formed of a color conversion film that is viewed with the first color or the second color according to a viewing angle.

The color converting optical layer may be formed through multilayer thin film metal deposition including a light absorbing layer, a dielectric layer, and a reflective layer.

According to another aspect of the present invention, there is provided a method of manufacturing a security element according to the first aspect, comprising: printing an inflator on one side of the substrate; Forming the color conversion optical layer to cover the inflator; And a step of simultaneously applying heat, heat and pressure to the inflator so that the inflator expands to form the convex pattern on the color converting optical layer.

The convex pattern may be formed as an inclined surface having a specific angle to satisfy the color reversal condition at the first viewing angle or the second viewing angle.

The plurality of convex patterns may have the same inclined surface so that the color reversal occurs simultaneously at the first viewing angle or the second viewing angle.

The color conversion optical layer may be formed of a color conversion film that is viewed with the first color or the second color according to a viewing angle.

Further, according to another preferred embodiment, there is provided a security product including a color reversal security element according to the aforementioned viewing angle.

As described above, according to the present invention, in the color conversion optical layer including the first region constituted by the convex pattern and the second region defined by the first region, the two regions are visually recognized in different colors by the convex pattern, In the first viewing angle of the user, the first area and the second area are respectively viewed as a first color and a second color, and at a second viewing angle of the user, the first area and the second area are reversed to the second color and the first color, respectively It is possible to easily confirm whether or not the image is forged or falsified by recognizing the color conversion more dramatically by the naked eye without any other tool.

Further, since the film surface is formed in a convex pattern, it can be used as an element for preventing forgery and falsification due to tactile effect, thus providing an effect as a security element for a visually impaired person at the same time.

1 is a view showing that a color converting optical layer is viewed in two colors according to a viewing angle.
2 is a block diagram illustrating the configuration of a security element that is visible at a first viewing angle in accordance with one embodiment of the present invention.
FIG. 3 is a view showing a pattern recognized at a first viewing angle according to an embodiment of the present invention.
4 is a block diagram illustrating a configuration of a security element that is viewed at a second viewing angle according to another embodiment of the present invention.
5 is a view showing a pattern recognized at a second viewing angle according to another embodiment of the present invention.
6 is a view showing the manufacture of a block pattern according to another embodiment of the present invention.
7 is a diagram illustrating a security element manufactured in accordance with another embodiment of the present invention.
8 is a view showing the manufacture of a block pattern according to another preferred embodiment of the present invention.
9 is a view showing a security element manufactured according to another preferred embodiment of the present invention.
10 and 11 are views showing a security element manufactured according to another preferred embodiment of the present invention.
12 is a diagram illustrating a security element formed by a cutout according to another preferred embodiment of the present invention.
13 is a plan view of a security element according to another preferred embodiment of the present invention.
14 is a view illustrating a height of a convex pattern of a security element according to another preferred embodiment of the present invention.
15 is a flowchart showing a specific example of a method of manufacturing a security element according to another preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention are shown and described, and the other parts of the drawings and descriptions are omitted so as not to obscure the gist of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In addition, terms and words used in the following description and claims should not be construed to be limited to ordinary or dictionary meanings, but are to be construed in a manner consistent with the technical idea of the present invention As well as the concept.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For simplicity of explanation, one or more methods are shown and described herein as a series of steps, for example in the form of a flowchart or a flowchart, but the present invention is not limited by the order of the steps, As it can be done in a different order than that shown and described herein or concurrently with other steps. Furthermore, not all illustrated steps may have to be implemented in accordance with the present invention.

In describing the various embodiments of the present invention, corresponding elements are denoted by the same names and the same reference numerals. In order to explain the embodiments of the present invention, the size of components, the thickness of lines, and the like in the drawings referred to may be exaggerated for the sake of understanding. Also, in the present invention, the terms 'upper' and 'lower' are expressions indicating relative positions, and the present invention does not exclude the presence of other components in the middle.

1 is a view showing that a color converting optical layer is viewed with two colors according to a viewing angle.

Is 1, the color converting optical layer 11 is (a) a is admitted to the magenta color first field of view gyak (θ _1), (b) is viewed in the green color second field gyak (θ ₂₎ Respectively.

The color conversion optical layer 11 may be printed using a liquid polymer, an optically variable ink from SICPA, Iriodin (R) from Merck, and the like.

It may also be constituted by multilayer thin film metal deposition, which will be described in FIGS. 10 and 11. FIG.

The color-shifting color conversion security element has a merit that the color can be changed according to an angle viewed by an observer, and the authenticity can be easily confirmed even by the naked eye without using a tool such as a magnifying glass or an ultraviolet lamp. In addition, the color conversion effect can not be reproduced by merely scanning and copying, which is a very effective technique for preventing forgery.

However, recently, counterfeit cases using similar films such as a beauty film and a stationary film have occurred, and it is difficult to cope with a high degree of counterfeiting only by a simple color conversion effect. Various security technologies have been proposed in order to cope with such counterfeiting. Such security techniques include a technique of enhancing security characteristics by combining a thin film interference layer and a diffraction pattern, a technique of disposing metal layers having different hues to produce different hues, and the like, There is a disadvantage in that the cost is increased or the color conversion effect is insufficient.

2 is a block diagram illustrating a configuration of a security element 10 that is viewed at a first viewing angle in accordance with one embodiment of the present invention.

2, the security element 10 according to the present invention includes a substrate 13, a color conversion optical layer 11, and a convex pattern 15. [

The base material 13 may be a synthetic resin film, but not always limited thereto.

It is preferable that the synthetic resin film is transparent and elongate. Such a film is preferably made of a material selected from the group consisting of polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polyamide (PA), acrylonitrile butadiene styrene (ABS), polyvinyl chloride (polyvinyl fluoride), and polyvinylidene fluoride (PVDF). The thickness of such a synthetic resin film is preferably 5-100 mu m, but is not limited thereto.

The color conversion optical layer 11 may be formed on the base material 13 or on one side as the color conversion optical layer described in Fig.

The convex pattern 15 is a part of the color conversion optical layer 11 protruding like an emboss.

The convex pattern 15 allows the security element 10 to be viewed in two colors. That is, the color is recognized as two colors, magenta color recognized by a viewing angle of? ₁ and green color recognized by a viewing angle of? ₂ . If the region constituted by the convex pattern 15 is referred to as a first region and the region separated from the first region is referred to as a second region, the first region is visually recognized as a green color, and the second region is visually recognized as a magenta color .

In other words, the color conversion optical layer in which only one color change occurs is recognized as two colors due to the convex pattern 15. [

For example, referring to FIG. 3, if the pattern A is a first region formed by the convex pattern 15 and the other region is a second region, the pattern A is a first region, And the other portion is visually recognized as a magenta color as the second region.

4 is a block diagram illustrating a configuration of a security element 10 that is viewed at a second viewing angle in accordance with another embodiment of the present invention.

Referring to FIG. 4, the difference from FIG. 2 is that the user is viewing at a viewing angle different from FIG.

The convex pattern 15 allows the security element 10 to be viewed in two colors. That is, the color is recognized as two colors, magenta color recognized by a viewing angle of? ₁ and green color recognized by a viewing angle of? ₂ .

Compared with FIG. 2, the first region constituted by the convex pattern 15 is visually recognized as a magenta color, and the second region is recognized as a green color. That is, the colors of the first area and the second area are reversed and 'color reversed'.

For example, referring to FIG. 5, the pattern (A) is visually recognized as a magenta color as a first region and the second region is recognized as a green color.

As described above, when comparing the embodiments of Figs. 2 to 5, in the color converting optical layer 11 including the first region composed of the convex pattern 15 and the second region different from the first region, The first area (the convex pattern area) and the second area (the other area) are visually recognized as the first color (green) and the second color (magenta), respectively, at a specific viewing angle of the user. The first area (convex pattern area) and the second area (other area) are visually recognized as the second color (magenta) and the first color (green), respectively, when the user looks at another specific viewing angle.

That is, according to the viewing angle that the user views, the two colors are rearranged and 'color reversal' occurs.

Therefore, it is possible to easily confirm whether or not a forgery or falsification has occurred by perceiving the color conversion more dramatically by the naked eye without any other tool.

In addition, since the film surface is formed in a convex pattern, it can be used as an element for preventing forgery and falsification due to tactile effect, thereby providing an effect as a security element for a visually impaired person at the same time.

In order to generate the above-described dramatic color reversal, the convex pattern 15 must be formed so as to satisfy a predetermined 'color reversal condition'.

Color reversal conditions, in the first region and the second region of the color converting optical layer 11, the first viewing angle (θ ₁₎ in each of which is admitted to the first color and the second color, a second viewing angle (θ ₂₎ So as to be reversed to the second color and the first color, respectively.

That is, it is preferable to form the inclined surface of the convex pattern 15 so that a viewing angle of? ₁ and? ₂ is generated.

It is preferable that the plurality of convex patterns 15 have the same inclined surface so that color reversal occurs simultaneously at the first viewing angle or the second viewing angle when the number of the convex patterns 15 is plural.

Although the convex pattern 15 is formed in the color conversion optical layer 11 for the convenience of explanation throughout the specification, the concave pattern may be formed instead of the convex pattern 15 in the color conversion optical layer 11 It is obvious that the same color reversal effect can be obtained.

6 is a view showing the manufacture of the block pattern 15 according to another embodiment of the present invention.

Referring to Fig. 6, a printing plate 21 (mold or roll) for forming the convex pattern 15 is shown.

The pressure or the heat and the pressure are simultaneously applied to the color conversion optical layer 11 by using the printing plate 21, the metal mold 21 or the roll 21 in which a plurality of concavities and convexities are formed according to a specific pattern or pattern design, A convex pattern 15 or a concave pattern can be formed on a part or entire surface of the substrate 11.

7 shows that the convex pattern 15 is formed on the security element 10 by using the printing plate 21, the metal mold 21, or the roll 21.

8 is a view showing the manufacture of a block pattern 15 according to another preferred embodiment of the present invention.

Referring to Fig. 8, use of an inflator 23 to form the convex pattern 15 is shown.

Examples of the expanding agent (23) include a low molecular weight organic acid or a type that induces carbon dioxide gas discharge through reaction of an acid salt with salt or sodium hydrogen carbonate, and a type that acts singly at room temperature including tartaric acid or tin. As one type of swelling agent 23, baking powder refers to all of the chemical swelling agents in powder form. The most commonly used baking powder is a mixture of sodium aluminum sulfate and calcium phosphate.

The inflator 23 can be printed between the substrate 13 and the color conversion optical layer 11.

The expanding agent 23 can swell up (expand) when heat, heat, and pressure are applied simultaneously, so that the convex pattern 15 is formed in the color conversion optical layer 11.

Figure 9 shows the convex pattern 15 and the color reversal optical layer 11 produced by expanding the inflator 23 and that the inflated inflator 25 is bulging up before it is expanded .

10 and 11 are views showing a security element 10 manufactured according to another preferred embodiment of the present invention.

Referring to FIGS. 10 and 11, it is shown that the color conversion optical layer 11 is formed using multilayer thin film metal deposition.

The multilayer thin film metal deposition is to form the color conversion optical layer 11 by forming the light absorbing layer 31, the dielectric layer 33, and the reflection layer 35 on the substrate.

Such a multi-layered thin-film metal structure selects a constituent material and a forming thickness according to a color to be displayed according to a viewing angle in a final product. The constituent material is composed of a material having the same or different refractive index and having a refractive index between 5 nm and 1000 nm It may be desirable to form different thicknesses.

10, a reflective layer 35 is formed on one side of the substrate 13, and a dielectric layer 33 and a light absorbing layer 31 are sequentially formed on the reflective layer 35. Alternatively, as shown in FIG. 11, The light absorbing layer 31 may be formed and then the dielectric layer 33 and the reflective layer 35 may be sequentially formed.

The light absorbing layer 31 is preferably formed to a thickness of 5-10 nm and any one or a combination of two or more of chromium, nickel, palladium, titanium, cobalt, iron, tungsten, molybdenum and iron oxide may be used as a material.

The dielectric layer 33 may be formed of any one or a combination of two or more of SiO2 (silicon dioxide), Al2O3 (aluminum oxide), and MgF2 (magnesium fluoride). The thickness of the dielectric layer 33 is preferably 100 nm to 1000 nm . ≪ / RTI >

The reflective layer 35 may be selected from any one of Al, Sn, Cu, Zn, Pt, Au, Ag, Ni and Fe or an alloy thereof. The reflective layer 35 may have a thickness of at least 20 nm, .

12 is a view showing a security element 10 formed by a cutout according to another preferred embodiment of the present invention.

In the formation of the optical layer 11 in which the color is changed, it may be formed on the entire surface of the synthetic resin film as a base material through printing or lamination deposition as described above. Alternatively, A portion of the cutout portion 38 may be cut out so that the color of the cutout portion 38 and the peripheral portion thereof may be formed differently.

As a method of cutting out a part of the color conversion optical layer 11, when the color conversion optical layer 11 is formed using printing, a water soluble ink is printed on a part of the base material 13 in accordance with the design form A part of the color converting optical layer 11 can be cut out by completely printing the color converting optical layer 11 and washing and washing the water-soluble ink.

As another cut-out method, when a color conversion optical layer is formed through the multilayer thin film metal deposition described in FIGS. 10 and 11, a portion of the substrate 13 is formed using water-soluble ink at any one stage among the multi- And then the remaining multilayer deposition is performed. Thereafter, the water-soluble ink is washed with water to cut out a portion thereof.

FIG. 13 is a plan view photograph of a security element 10 according to another preferred embodiment of the present invention, and FIG. 14 is a view showing a height of a convex pattern of a security element according to another preferred embodiment of the present invention Fig.

As an example using the method of FIG. 11, chromium may be deposited to a thickness of 5 nm on a 38 μm PET film to form an absorption layer, and then a color conversion film may be manufactured in the order of lamination of a SiO 2 dielectric layer of 410 nm and a 30 nm Al reflective layer.

The color conversion film thus manufactured has a magenta color when viewed from the front and a green color as shown in FIG. 1 (b) when viewed from the side at 45 °.

The color conversion film manufactured by the above-described method is embossed (convex pattern, concave pattern or concaved pattern 15) with the printing plate 21 having the concave-convex portion as shown in Fig.

At this time, the printing plate forming the embossing 15 may be embossed 15 in the form of letter, number, specific pattern, shape or the like. The angle between the substrate surface and the shape which is irregularly concave and convex may be expressed by the color The color conversion security element 10 according to the viewing angle can be created.

The color reversal security element 10 according to the thus produced viewing angle can be divided into an oddly embossed portion and a non-embossed portion as shown in FIGS. 13 and 14, It can be changed differently.

The color conversion film formed according to the deposition laminate design, that is, the surface of the security element 10 which is not embossed, is seen as a magenta color when viewed from the front as shown in FIG. 3, and a green color appears as a portion where unevenness is formed.

However, when the color reversal security element 10 is obliquely observed at an inclination of 45 degrees, the surface of the security element 10 which is not embossed is seen as a green color, and the portion where the unevenness is formed is reversed to a color opposite to that of a magenta color do.

15 is a flowchart (S50) showing a specific example of a method of manufacturing the security element 10 according to another preferred embodiment of the present invention.

Referring to FIG. 15, in step S51, the inflator 23 may be printed on one side of the substrate 13.

The inflator 23 may be printed on a part of the substrate 13 according to the pattern or pattern to be implemented.

The color conversion optical layer 11 or the color conversion optical film 11 may be formed so as to cover the inflator 23 in the step S53.

The color conversion optical layer 11 can be printed using a liquid crystal polymer, a color conversion ink, or the like.

Further, the color converting optical layer 11 may be formed through the multilayer thin film metal deposition described in Figs.

Heat, heat and pressure are applied simultaneously to the inflator 23 in step S55 so that the inflator 23 is inflated to form the convex pattern 15 on the color conversion optical layer 11 or the color conversion optical film 11. [

As described above, according to the present embodiments, in the color conversion optical layer 11 including the first region composed of the convex pattern 15 and the second region separated from the first region, the convex pattern 15 The first region and the second region are visually recognized as the first color and the second color at the first viewing angle of the user and the first region and the second region are viewed at the second viewing angle of the user, 2 regions are reversed to the second color and the first color, respectively. Thus, it is possible to easily confirm whether or not the image is forged or falsified by recognizing the color conversion more visually without any tools.

In addition, since the film surface is formed in a convex pattern, it can be used as an element for preventing forgery and falsification due to tactile sensation, so that it can simultaneously provide an effect as a security element for the visually impaired.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Color reversal security factor according to viewing angle
11: color conversion optical layer or color conversion optical film
13: substrate
15: convex pattern or concave pattern or embossing
21: Printing plate or mold or roll
23, 25: Inflator
31: absorbing layer
33: Dielectric layer
35: Reflective layer
38: cutout portion

Claims (12)

materials; And
A color conversion optical layer formed on the substrate, the color conversion optical layer including a first region formed of a convex pattern and a second region separated from the first region;
/ RTI >
The convex pattern is formed so as to satisfy the color reversal condition,
Wherein the color reversal condition is such that the first region and the second region of the color conversion optical layer are visually observed in a first hue and a second hue at a first viewing angle, The color reversal security element according to the viewing angle.
The method according to claim 1,
Wherein the convex pattern is formed as a slope of a specific angle so as to satisfy the color reversal condition at the first viewing angle or the second viewing angle.
The method according to claim 1,
Wherein the plurality of convex patterns have the same inclined surface so that the color reversal occurs simultaneously at the first viewing angle or the second viewing angle.
The method according to claim 1,
Wherein an expansion agent is printed between the substrate and the color conversion optical layer and the expanding agent expands when heat or heat and pressure are simultaneously applied to form the convex pattern on the color conversion optical layer. Element.
The method according to claim 1,
Wherein the convex pattern is formed by printing a water-soluble ink on a part of the substrate and forming the color-converting optical layer and then cutting out the water-soluble ink.
The method according to claim 1,
Wherein the color conversion optical layer is formed of a color conversion film that is viewed with the first color or the second color according to a viewing angle.
The method according to claim 1,
Wherein the color converting optical layer is formed through a multilayer thin film metallization including a light absorbing layer, a dielectric layer, and a reflective layer.
A manufacturing method for manufacturing the security element of claim 1,
Printing an inflator on one side of the substrate;
Forming the color conversion optical layer to cover the inflator; And
Applying heat or heat and pressure to the inflating agent simultaneously to cause the inflating agent to expand to form the convex pattern on the color converting optical layer;
≪ / RTI >
9. The method of claim 8,
Wherein the convex pattern is formed as an inclined surface having a specific angle so as to satisfy the color reversal condition at the first viewing angle or the second viewing angle.
9. The method of claim 8,
Wherein the plurality of convex patterns have the same inclined surface so that the color reversal occurs simultaneously at the first viewing angle or the second viewing angle.
9. The method of claim 8,
Wherein the color conversion optical layer is formed of a color conversion film visually recognized as the first color or the second color according to a viewing angle.
A security product comprising a color reversal security element according to any one of claims 1 to 7.

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