KR101625981B1

KR101625981B1 - Multi-view 3d image security element and security goods comprising the same

Info

Publication number: KR101625981B1
Application number: KR1020150108316A
Authority: KR
Inventors: 주성현; 채종훈; 최일훈; 김동후; 강주희; 김종재; 박병훈
Original assignee: 한국조폐공사
Priority date: 2015-07-30
Filing date: 2015-07-30
Publication date: 2016-06-01

Abstract

Provided are a security element having an improved effect in comparison to a conventional technology, and a security product including the same. The security element comprises: a microlens array wherein a plurality of microlenses is arranged at predetermined arrangement intervals; a first micro image array, wherein a plurality of microimages is arranged at arrangement intervals which are different from the predetermined arrangement intervals, and which is separated from the microlens array; and a second microimage array which is arranged at the same arrangement interval. Only a moire expansion image formed by the first microimages is observed in a first observation distance. A moire expansion image formed by the second microimages is observed from a second observation distance which is shorter than the first observation distance.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a multi-view image security element and a security product including the same,

The present invention relates to a security element and a security product including the security element. More particularly, the present invention relates to a security element including both a moire enlarged image and a moire enlarged image that appear at a normal time, and a security product using the same.

Security documents such as banknotes, securities, gift certificates, passports, ID cards, and security labels generally use security features to prevent forgery and falsification. Also, these security factors are increasingly included in the product or its package for activation.

As a security element technique used in security documents, a technique of representing a stereoscopic effect using the principle of moire magnification is known. Korean Patent Registration No. 1089435, for example, discloses a technique for displaying a stereoscopic moire enlarged image and an ortho-parallactic motion effect using a micro lens array and a micro image array.

According to this technique, a stereoscopic film having a thin thickness can be produced, and a stereoscopic image to be realized is observed in a wide viewing range. However, the stereoscopic effect is monotonous and it is difficult to express an enlarged image of a more colorful color.

Korean Patent No. 1324764 discloses a technique for realizing a hidden effect in which a moire enlarged image is observed only when the security element is observed near the surface of the security element, which is not visible at the time of general observation. According to this technology, there is an advantage that the security function is strengthened, but the security element has a structure in which a plurality of lenticular lenses are overlapped, so that the entire thickness of the security element becomes thick, which is a restriction factor for application of the security element.

Therefore, as a security element using a moire enlarged image, there is a demand for a security element technology capable of realizing a thinner thickness while having improved stereoscopic effect and enhanced security function.

Korean Patent No. 1089435 Korean Patent No. 1324764

SUMMARY OF THE INVENTION It is an object of the present invention to provide a security element having improved effects over the prior art and a security product including the security element. Specifically, the present invention relates to a thin-walled security element comprising a plurality of moiré magnified images, some of which are not visible at normal viewing times and are only observed at a close proximity to the surface of the security element, The purpose is to provide one.

According to an aspect of the present invention, there is provided a security element comprising: a substrate; A microlens array in which a plurality of microlenses are formed in a predetermined arrangement period on the upper side of the substrate; A first micro image array in which a plurality of first micro images are formed in a first arrangement period at a lower portion of the substrate; And a second micro image array in which second micro images are formed in a second arrangement period under the first micro image array, wherein the arrangement period of either the first arrangement period or the second arrangement period is a period Wherein the first micro image array and the second micro image array are both of the same arrangement period as the predetermined arrangement period of the microlenses and the other one of the arrangement periods is different from the predetermined arrangement period of the lenses, Is located within the focal depth of the lens. At this time, a protective layer may be further formed on the microlens array.

According to another aspect of the present invention, there is provided a security element comprising: a substrate; A first micro image array in which a plurality of first micro images are formed in a first arrangement period at a lower portion of the substrate; A second micro-image array in which a plurality of second micro-images are formed in a second arrangement period under the first micro-image array; A microlens array in which a plurality of microlenses are formed at a predetermined arrangement period under the second micro image array; And a reflective layer formed under the microlens array, wherein the arrangement period of any one of the first arrangement period and the second arrangement period is an arrangement period different from the predetermined arrangement period of the microlenses, Is the same arrangement period as the predetermined arrangement period of the microlenses, and both the first micro image array and the second micro image array are located within the focal depth of the microlens. At this time, a spacer layer may be further interposed between the second micro image array and the microlens array.

In some embodiments of the present invention, a hidden effect observation unit may be formed on a specific area of the security element, and an alignment period that is the same as a predetermined alignment period of the first micro-image array and the second micro- May be formed in at least the hidden effect observing portion.

In addition, the first micro image and the second micro image may be formed in different colors.

Further, in some embodiments of the present invention, the focal plane of the microlens may be located between the first micro image and the second micro image, and the F-number of the microlens may be two or more .

The first micro image or the second micro image may be intaglio printed in a recess formed in the image forming layer, and the intaglio printing may include a step of forming a concave portion in which the color ink, the color conversion ink, the metallic ink, the magnetic ink, Or a specific wavelength sensitive ink, or may be formed by vacuum depositing a dielectric material or a metal material in the recessed portion.

The security element according to the present invention comprises a first moire magnification image appearing from the first micro image array and a second moire magnification image appearing from the second micro image array, Only one of the first moire magnification image and the second moire magnification image is observed when being observed in a state of being separated by an observation distance, and in a state of being apart from the first observation distance by a second observation distance close to the surface of the security element And when observing, one of the first moire enlarged image and the second moire enlarged image may be observed. Here, the second observation distance may be 5 cm or less.

A security product according to another aspect of the present invention may include a security element of any of the above embodiments.

At this time, the security element may be attached to the surface of the security product, or may be at least partially inserted into the security product.

When the security element is included in the curved surface of the security product, the arrangement period of the microlenses, the first and second micro images may be corrected in consideration of the arrangement period distortion due to the curved surface, The following formula 1 can be considered for correction.

p = (r + t) / r ------ [Formula 1]

(where p is the difference in arrangement period distortion of the microlens array and the first or second micro image array, r is the radius of curvature of the curved surface, t is the distance between the microlens array and the first or second micro image array Distance)

According to another aspect of the present invention, there is provided an activation module for authenticating a security element of any one of the above embodiments, comprising: an imaging unit for taking a close-up picture of a security element; An image analyzer for analyzing a moire enlarged image photographed by the photographing unit; A characteristic value extracting unit for extracting a predetermined characteristic value of the analyzed moire enlarged image; A reference value storage unit in which the design value of the characteristic value of the moire enlarged image is stored as a reference value; An authentication unit for comparing the characteristic value extracted by the characteristic value extracting unit with a reference value stored in the reference value storage unit to authenticate whether the product is genuine; And an authentication result output unit outputting the authentication result.

The activation device according to another aspect of the present invention includes the activation module.

According to another aspect of the present invention, there is provided a security element comprising: a micro lens array in which a plurality of microlenses are formed in a predetermined arrangement period; A first micro image array formed at a predetermined distance from the microlens array and having a plurality of first micro images formed in a first arrangement period; And a second micro image array formed spaced apart from the first micro image array by a predetermined distance and wherein a plurality of second micro images are formed in a second arrangement period, wherein the first micro image array and the second micro image array Are arranged in the same direction (upper or lower) with respect to the microlens array, the first arrangement period being different from the predetermined arrangement period of the microlenses, and the second arrangement period being a predetermined arrangement And the first micro image array and the second micro image array are all located within the focal depth of the microlens.

Here, the second micro image array may include a first area in which the second micro images are formed in a second arrangement period and a second area formed in a third arrangement period, And / or may be different from the first arrangement period.

In addition, in the second region, a first moire magnification image appearing from the first micro image array and a third moire magnification image appearing from the second micro image array may be simultaneously observed.

Also, the second micro image may be formed of different images in the first area and the second area.

According to the present invention, it is possible to provide a security element having an improved effect over the prior art and a security product including the security element. Specifically, according to the present invention, by providing a thin-walled security element that includes a plurality of moire magnification images, some of which are not visible at normal viewing times and are only observed at a near instant near the surface of the security element, The effect of preventing forgery and falsification can be greatly improved.

Further, according to the present invention, it is possible to easily confirm whether a genuine article is authenticated by using an activation device such as a portable terminal.

1 is a cross-sectional view of a security element in accordance with an embodiment of the present invention.
2 is a conceptual diagram showing the correlation of the depth of focus according to the curvature of the microlens.
3 is a view showing the positional relationship between the depth of focus of the microlenses and the first and second micro image arrays.
4 is a view showing an enlarged moire image in the security element according to the present invention.
5 is a diagram illustrating a security element according to the present invention with hidden effect monitoring.
6 is a cross-sectional view of a security element according to another embodiment of the present invention.
7 is a cross-sectional view of a security element according to another embodiment of the present invention.
8 to 10 are illustrations of a security product including a security element according to the present invention.
11 is a configuration diagram of the activation module according to the present invention.
12 is an example of authenticating whether or not the security element is authentic by the activation device.
FIG. 13 (a) is a view showing a moire enlarged image in a security element according to another embodiment of the present invention, and FIG. 13 (b) is a cross-sectional view of a security element according to line A-A '.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to or limited by the embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the present invention, the terms 'upper' and 'lower' are to be understood as terms representing relative directions, and it is to be understood that any one configuration is formed in 'upper' or 'lower' It is not entirely excluded that the constitution is intervened. In describing the various embodiments of the present invention, corresponding elements are denoted by the same names and the same reference numerals.

1 is a cross-sectional view of a security element in accordance with an embodiment of the present invention. 1, a security element 100 according to an exemplary embodiment of the present invention includes a substrate 110, a microlens array 120 formed on the substrate 110, a substrate 110, And a second micro image array 140 formed at a lower portion of the first micro image array 130. The first micro image array 130 is formed at a lower portion of the first micro image array 130,

The substrate 110 has a structure for separating the micro-lens array 120 and the micro-image arrays 130 and 140 from each other by a predetermined distance while supporting the security element 100 as a whole. The substrate 110 may be a transparent material having a high transmittance in the visible light region And may be a flexible film material. For example, it may be a plastic material such as polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polypropylene (PP), polyethylene (PE)

The thickness of the substrate 110 may be 0.5 mm or less, but the thickness may be determined according to the depth of focus of the microlens 121. That is, the thickness of the substrate 110 may be determined so that the first microimage array 130 and the second microimage array 140 are positioned within the focal depth of the microlens 121. Preferably, the focal plane of the microlens 121 is between the first micro-image array 130 and the second micro-image array 140, specifically between the first micro-image 132 and the second micro- Micro-image 142, as shown in FIG.

The microlens array 120 has a microlens array 121 having a fine size. The microlens array 120 has a two-dimensional Bravais lattice structure such as a square array, a rectangular array, a hexagonal array, As shown in FIG. The array period of the microlens array 120 may be about 100 탆 or less, but is not limited thereto.

Each of the microlenses 121 constituting the microlens array 120 may have a relatively deep depth of focus such that the first micro image array 130 and the second micro image array 140 are located within the depth of focus thereof. have. For this purpose, it is preferable that the ratio of the focal length to the diameter of each microlens 121, that is, the F-number is 2 or more. An F-number of 2 or more can be obtained by adjusting the curvature of the microlens. For example, when the diameter is about 50 mu m, the curvature of the lens can be designed so that the focal distance is 100 mu m or more.

The correlation between the curvature of the lens and the depth of focus is conceptually shown in FIG. As shown in FIG. 2, the depth of focus is relatively shallow for a hemispheric lens, whereas the depth of focus may be relatively deep when the overall curvature is reduced. It is difficult to make both the first micro image array 130 and the second micro image array 140, which are vertically spaced apart, to be included in the depth of focus. However, when a micro lens having a deep depth of focus is used, The focal plane is positioned between the first micro image array 130 and the second micro image array 140 and specifically between the first micro image 132 and the second micro image 142 When the thickness is set, both the first micro image array 130 and the second micro image array 140 may be included in the depth of focus of the microlens 121 as shown in FIG. Thus, as described later, it is possible to make all of the moire enlarged images due to the two micro image arrays 130 and 140 vividly observed.

1 to 3, the microlenses 121 constituting the microlens array 120 are illustrated as refracting lenses in which a material having a specific refractive index is formed into a curved surface. However, no. For example, within the range suitable for the purpose of the present invention, the microlens 121 may be a diffractive lens, a gradient index lens, or other optical system capable of performing imaging function.

The first micro image array 130 has a structure in which the first micro images 132 are arranged in the first image forming layer 131 at a first period and the micro images 132 are arranged under the substrate 110, May be formed in a direction opposite to the array 120. The first image forming layer 131 may be formed of a resin material such as UV curable resin and the first microimages 132 may be formed on the first image forming layer 131 by intaglio printing such as imprint or gravure printing Or the like. Optionally, the first micro-images 132 may be printed directly on the surface of the substrate 110, in which case the first image-forming layer 131 may be the same as the substrate 110.

The second micro image array 140 may be formed in the lower portion of the first micro image array 130 in a configuration in which the second micro images 142 are arranged in the second image forming layer 141 at a second period. The second micro-images 142 may be formed on the second image-forming layer 141 by intaglio printing or gravure printing such as imprint printing or the like, Or the like.

The first micro image 132 and the second micro image 142 are arranged in a planar array in the first micro image array 130 and the second micro image array 140, , A two-dimensional Bravais lattice such as a rectangular array, a hexagonal array, and a parallelogramar array. The arrangement of the first micro image 132 and the second micro image 142 may be the same as the arrangement of the microlenses 121.

The first period, which is the period of arrangement of the first micro images 132 of the first micro image array 130, may be different from the arrangement period of the micro lenses 121. For example, the arrangement period of the first micro-images 132 may be smaller or larger than the arrangement period of the micro-lenses 121. This may cause the moire enlarged image by the first micro-images 132 to appear to be inside the security element 100 or protrude out of the security element 100, Thereby providing a stereoscopic effect to the liquid crystal panel 100.

However, the difference in the arrangement period of the first micro images 132 and the micro lenses 121 is not large, and the arrangement period ratio of the first micro images 132 to the arrangement periods of the micro lenses 121 is within about 0.9 to 1.1 Can be.

As a method of making the arrangement periods of the first micro images 132 and the microlenses 121 different from each other, a method known in the art of a stereoscopic effect using a moire enlargement phenomenon can be used. For example, the intervals between the microlenses 121 and the micro images 132 may be formed differently, or may be formed at equal intervals, but the alignment periods may be made different by adjusting the matching angles of the two arrays .

The second period of the second micro image 142 of the second micro image array 140 may be the same as the period of the micro lenses 121. That is, the second micro images 142 and the microlenses 121 may have the same arrangement and arrangement period. For this purpose, it is possible to design two arrays of the same arrangement type and equally spaced, and then substantially overlap (matching angle = 0). When the array period is the same, the enlargement magnification of the moire enlarged image becomes infinite. Therefore, in a general viewpoint (the distance between the eyes and the security element is about 30 cm), the moire enlarged image is not observed. And the separation distance of the security element can be observed only at about 5 cm or less. Here, the same arrangement period does not necessarily mean completely the same, but may mean that the ratio of the two arrangement periods is in the range of 0.997 to 1.003.

By forming the first and second micro images 132 and 142 in different colors, the moire enlarged images by the micro images 132 and 142 may be displayed in different colors. To this end, a method may be used in which a concave portion is formed in the first image forming layer 131, a first color coating material is filled, a concave portion is formed in the second image forming layer 141, and a second color coating material is filled have. As the first and second color paints, a general colored ink may be used, but special inks having additional functions such as a color conversion ink, a metallic ink, a magnetic ink, an ultraviolet sensitive ink, an infrared sensitive ink and a specific wavelength sensitive ink may be used have. Alternatively, the first and second micro images 132 and 142 may be formed by vacuum deposition of a dielectric material, a metal material, or the like in the recess. The method of forming the first and second micro images 132 and 142 is not limited to the engraved printing but may be a method of printing first and second colors of paints on the first and second image forming layers 131 and 141 May be used.

The thicknesses of the first and second micro image arrays 130 and 140 are not necessarily the same, but may be determined so that they are all located within the depth of focus of the microlenses 121. To this end, the focal plane of the microlens 121 may be adjusted to be positioned between the first and second micro image arrays 130 and 140, specifically between the first and second micro images 132 and 142.

FIG. 4 is a view showing a moire enlarged image in the security element 100 according to the present invention, which is a result of observing the security element 100 in the direction of the microlens array 110. Reference numeral 210 denotes an image obtained by enlarging the first micro image array 130 by a moire enlargement phenomenon in a first moiré enlargement image, reference numeral 220 denotes a second moiré enlargement image, and a second micro image array 140 includes a moiré enlargement It is an image enlarged by the phenomenon.

As shown in FIG. 4, according to the security element 100 of the present invention, only the first moire magnification image 210 is observed when the observer's eye is observed at a distance of the first observation distance from the surface of the security element 100 The second moire enlargement image 220 is not observed but is hidden when it is observed at a second observation distance closer to the surface of the security element 100 than the first observation distance, . The second observation distance may be a distance smaller than the first observation distance, for example, about 5 cm or less.

On the other hand, by making the arrangement period of the first micro-images 132 different from the arrangement period of the microlenses 121, a stereoscopic effect observed at different depths from the surface can be displayed. For example, if the arrangement period of the first micro-images 132 is made smaller than the arrangement period of the micro-lenses 121 (for example, 0.9), the first moire enlargement image 210 appears to be inwardly in the surface, A stereoscopic effect can be imparted such that when it is made larger than the arrangement period of the lenses 121 (for example, 1.1), it is observed as if protruding from the surface.

Also, the first and second micro images 132 and 142 are formed in different colors, so that the first and second moiré enlargement images 210 and 220 may be displayed in different colors. This can be a factor for further enhancing the authenticity of authenticity and forgery prevention function by adding visual effects to the stereoscopic effect of the security element 100 according to the present invention.

As described above, in the security element 100 according to the embodiment of the present invention, some of the two or more moire magnification images are observed at the first observation distance, and the others are not observed at the first observation distance, Since the effect observed at the second observation distance is exhibited, the security effect is more excellent than when a plurality of moire enlarged images are observed at the same observation distance. In addition, it is possible to easily check whether or not falsification or deformation has occurred without using a separate identification tool. Particularly, since the hidden effect can be realized by a thin film-like security element, there is an advantage that a plurality of lenticular lens sheets can overlap with each other in a variety of application fields compared to the conventional technology.

On the other hand, when the first and second micro images 132 and 142 are formed on the same plane, the printing process is not easy and the degree of design freedom is not high due to the overlap interference phenomenon. On the other hand, This problem can be solved by forming the micro images 132 and 142 so as to be spaced apart in the vertical direction and forming the micro lenses 121 to have a relatively large focal distance.

In the present embodiment, two micro image arrays 130 and 140 are provided. However, three or more micro image arrays may be provided to display three or more moire enlarged images. In this case, three or more microimage arrays can be adjusted to be included in the depth of focus of the microlenses 121.

Although the first micro image array 130 is formed on the second micro image array 140 in this embodiment, its position may be changed. That is, the relative positions of the first and second micro images 132 and 142 in the up and down direction are not limited to the present invention.

Meanwhile, a second micro image array 140 for giving a hidden effect may be formed only at a specific position of the security element 100, as shown in FIG. 5 shows a hidden effect observation unit 230 formed at a specific position of the security element 200 and a second micro image array 140 formed only at the hidden effect observation unit 230. According to this configuration, The second moire enlarged image 220 can be observed only when the eye is closely located to the eye 230, and only the first moire enlarged image 210 can be observed in the remaining area.

6 is a cross-sectional view of a security element 300 according to another embodiment of the present invention. In comparison with the embodiment of FIG. 1, there is a difference that the protective layer 310 is further provided on the upper portion of the microlens array 120. The security element 100 of FIG. 1 may cause physical durability such as scratches or breakage of the microlens 121 because the microlens array 120 is exposed on the surface, or contact copying may occur, May be the cause of forgery. On the other hand, the security element 300 of FIG. 6 improves the durability of the microlens array 120 because the microlens array 120 is covered with the protective layer 310, .

The protective layer 310 is preferably made of a material having a large difference in refractive index from the microlens 120, and the refractive index difference is preferably larger than 0.2. For example, when the refractive index of the material of the microlens 121 is about 1.9, the refractive index of the material of the protective layer 310 may be about 1.5. Or the refractive index difference between the material of the microlens 121 and the material of the protective layer 310 is not large, a high refractive index transparent coating may be applied to the surface of the microlens array 120 to cause a refractive index difference with the material of the protective layer 310 have. The high refractive index transparent coating can be formed by an optical coating method in which a high refractive index medium such as TiO ₂ , ZrO ₂ , ZnS, ZnO and the like is vacuum deposited.

7 is a cross-sectional view of a security element 400 in accordance with another embodiment of the present invention. In the description of the security element 400, a detailed description of the contents overlapping with the above embodiments will be omitted. 7, a security element 400 according to another embodiment of the present invention includes a substrate 110, a first micro image array 130 formed on the bottom of the substrate 110, A second micro image array 140 formed below the image array 130, a microlens array 120 formed below the second micro image array 140, a reflective layer (not shown) formed under the microlens array 120 410).

The substrate 110 may be a transparent material having a high transmittance in the visible light region and configured to physically protect the surface of the security element 400 while fully supporting the security element 400, It may be a material. For example, it may be a plastic material such as polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polypropylene (PP), polyethylene (PE)

A first micro image array 130 and a second micro image array 140 are formed below the substrate 110. The first and second micro image arrays 130 and 140 have first and second micro images 132 and 142 arranged at regular intervals on the first and second image forming layers 131 and 141, Images 132 and 142 may be print patterns printed with engraved or embossed. The first micro image 132 may be a printed pattern printed directly on the surface of the substrate 110 and in this case the second image forming layer 131 may be the same as the substrate 110. [

A microlens array 120 is formed below the second micro image array 140. The microlens array 120 has a microlens array 121 of a fine size and has a planar arrangement. The specific structure of the microlens array 120 is similar to that described in the embodiment of FIG. The curvature of the microlens 121 can be adjusted so that the first and second micro image arrays 130 and 140 are included in the depth of focus of the microlens 121, The focal length can be adjusted so as to be located between the first and second micro image arrays 130 and 140, specifically, between the first and second micro images 132 and 142. Unlike the embodiment of FIG. 1, the substrate 110 is not interposed between the micro image arrays 130 and 140, so that the microlens array 120 may be formed to have a predetermined thickness, A focal length can be adjusted by inserting a spacer layer (not shown)

In this embodiment, since the direction of the substrate 110 is the observation direction, the reflection layer 410 is formed under the microlens array 120. The reflective layer 410 is configured to allow the microlens array 120 to serve as a mirror, and the microlens array 120 serves as a reflector due to the reflective layer 410. Due to such a configuration, first and second moiré enlargement images 210 and 220 generated from the first and second micro images 132 and 142 can be observed in the upper direction of the substrate 110. The reflective layer 410 may be formed of a metal material having a high reflectivity in a visible light region such as aluminum (Al) or silver (Ag), but the present invention is not limited thereto. Other methods of providing a reflective effect can be used.

The security element 400 according to the present embodiment is configured such that, as in the above-described embodiments, some of the two or more moire magnification images are observed at the first observation distance, the other portions are not observed at the first observation distance, The effect observed at the second observation distance smaller than the first observation distance can be obtained. Further, since the hidden effect can be realized as a thin film-like security element, there is an advantage that a structure in which a plurality of lenticular lens sheets are overlapped is free from the application field of the prior art.

In particular, the first and second micro images 132 and 142 are spaced apart from each other in the vertical direction and the focal distance of the micro lens 121 is relatively increased, Can be easily formed without interference.

In addition, since the microlens array 120 is not exposed to the surface and the surface is protected by the substrate 110, durability is improved without a separate protective layer, and the possibility of forgery by close copying is reduced .

The embodiment of FIG. 7 may also include three or more micro image arrays to allow three or more moire enlarged images to be displayed. In this case, three or more microimage arrays can be adjusted to be included in the depth of focus of the microlenses 121. In addition, the vertical positions of the first micro image array 130 and the second micro image array 140 can be changed, and the relative positions of the two arrays are not limited in the present invention.

8 to 10 are illustrations of a security product including a security element according to the present invention. In the present invention, the term " security product " is used to mean all items including security elements, and is not limited to a specific object. For example, a security product may be a product, package, label, document, currency, card, identification, etc., that includes a security element.

8 is a diagram illustrating a case where the security element 510 according to the present invention is applied to a surface or a package of a product. The security element 510 may be a security element according to any of the embodiments of the present invention and may be attached to the surface of the article 500 using a sticker type label. At this time, in order to enhance the security, it is possible to add an operation identification function for displaying a specific pattern or letter when the label is not dropped or the label is dropped. The operation identification function is widely known in the security technology field, and thus a detailed description thereof will be omitted.

The security element 510 may be attached to the surface of the article 500, but may be integrally formed with the article 500 using an in-mold injection process or the like.

If the surface of the article 500 to which the security element 510 is attached is not a flat surface but a curved surface as shown in FIG. 8, the security element 510 can be designed considering the curvature of the curved surface to be attached. For example, when the security element 100 of FIG. 1 is attached to a curved surface, the micro lens array 120 and the first and second micro image arrays 130 and 140 are bent along the surface, , The arrangement period of the two micro images 132 and 142 may vary, and if there is a difference in the degree of variation, the first and second moiré enlarged images 210 and 220 may not be distorted or hidden. In order to solve this problem, considering the degree of warping of the microlens array 120 and the first and second micro image arrays 130 and 140 when attached to the curved surface, The array period can be corrected.

For example, when the security element 100 of FIG. 1 is attached to a curved surface of a radius of curvature r, the microlens array 120 may be more distorted in the arrangement period as compared to the first micro-image array 130 have. The difference p between the arrangement period distortion of the microlens array 120 and the arrangement period distortion of the first micro image array 130 is defined by the curvature radius r and the distance t between the two arrays Can be.

p = (r + t) / r ------ [Formula 1]

Therefore, it is possible to design the array period of each array considering the arrangement period of the microlens array 120 in the design process of the security element 100 is further distorted by p than the arrangement period of the first micro image array 130 So that even if adhered to the curved surface by this correction, the undistorted first moire enlarged image 210 as intended can be displayed. On the other hand, the arrangement period distortion of the second micro-image array 140 may be corrected in the same manner to realize the hidden effect as originally intended.

FIG. 9 is an exemplary view illustrating application of a security element 610 according to the present invention to a security document 600 such as a bank note, a gift certificate, and the like. The security element 610 may be made of a sticky type label and attached to the surface of the security document 600 in the same manner as described in FIG. 8, but may be inserted in the form of a partially exposed windowed thread as shown in FIG. 9 It is possible. The partial exposure hidden line may be manufactured by a method known in the security arts, such that a part is exposed outside the security document 600 and another part is embedded inside the security document 600, as shown in FIG. For example, the narrow and long strip-shaped security element 610 film can be manufactured by putting it in the process of manufacturing a secure document sheet.

FIG. 10 is an exemplary view illustrating application of the security element 710 according to the present invention to a card-type security product 700 such as a credit card, an ID card, and a passport. The security element 710 may be made of a sticker type label in the same manner as described in FIG. 8 and may be attached to the surface of the security product 700, at the same time, an operation identification technique may be applied together. Alternatively, in the course of manufacturing the card-type security product 700 by stacking a plurality of sheets of thin plastic sheets, the security element 710 according to the present invention may be disposed between the sheets or the outermost sheet, have.

The hidden effect of the security elements 100, 200, 300, 400, and 500 according to the present invention can be observed with the naked eye by changing the observation distance to a near-time point. However, And can be used to perform activation. The activation device is used to photograph the security elements 100, 200, 300, 400 and 500 according to the present invention, analyze the photographed second moire magnification image 220, extract a predetermined characteristic value therefrom, A device for authenticating by comparing a characteristic value with a stored reference value, and may be a portable terminal such as a smart phone including an activation module. At this time, the activation module may be provided in the activation device by installing predetermined software such as a smartphone application in the portable terminal.

One embodiment of the activation module is shown in FIG. 11, the activation module 800 according to the present invention includes an imaging unit 810, an image analysis unit 820, a characteristic value extraction unit 830, a reference value storage unit 840, 850 and an authentication result output unit 860.

The photographing unit 810 is configured to photograph the second moire enlarged image 220, and may include a camera module, and may optionally include an auto focus module and an automatic photographing module. For example, after activating the activation module and bringing the camera of the activation device closer to the surface of the security element, the second moire enlarged image 220 that has been hidden after being automatically focused can be automatically photographed. Activating the activation module here may mean, for example, running software installed in the mobile terminal. At this time, when the hidden effect observation unit 230 is provided in the security element, the camera can be photographed close to the hidden effect observation unit 230.

The image analyzing unit 820 is a unit for analyzing the image photographed by the photographing unit 810 and the characteristic value extracting unit 830 is for extracting characteristic values of the second moire enlargement image 220 among the analyzed images . Here, the characteristic value may be a numerical value that can be used to specify the second moire enlarged image 220 such as the number, the width, the size, the color, the arrangement period, and the arrangement angle of the second moire enlarged image 220.

The authentication unit 850 compares the characteristic value extracted by the characteristic value extraction unit 830 with the reference value stored in the reference value storage unit 840 to determine whether the authentication value is genuine or not . The authentication result may be outputted through the authentication result output unit 860 and the authentication result output through the authentication result output unit 860 may be video output through the display, audio output through the speaker, have.

FIG. 12 is an exemplary view illustrating an operation of activating the product 500 to which the security element 510 according to the present invention is applied, using the activation module 800 included in the activation device 900. FIG. 12, if the security element 510 is photographed close-up with the camera of the activation device 900 after activation of the activation module 800, the second moire enlargement image 910 Is photographed and the authentication result 920 is output to the display.

The security element according to embodiments of the present invention does not require that the arrangement period of the first micro image 132 or the second micro image 142 is constant in the entire area of the security element, . 5 illustrates that the second micro image array 140 is formed only in the hidden effect observation unit 230 so that the hidden effect is observed only in the hidden effect observation unit 230. However, It is possible to form the micro image array 140 and to form the arrangement period of the second micro images 142 differently from the hidden effect observation section 230 area. This will be described with reference to another embodiment of the present invention in Fig.

FIG. 13 (a) is a view showing a moire enlarged image in a security element according to another embodiment of the present invention, and FIG. 13 (b) is a cross-sectional view of a security element according to line A-A '. Compared with the embodiment of FIG. 5, the security element 1000 according to the present embodiment has second micro-images 142 formed in regions other than the hidden effect observation unit 230, Different from the arrangement period of the microlenses 121, unlike the observation unit 230. For example, the arrangement period of the second micro-images 142 is the same as the arrangement period of the microlenses 121 in the hidden effect observation unit 230, Lt; RTI ID = 0.0 > 0.9-1. &Lt; / RTI > Therefore, the second moire magnification image 220 can be observed at a close time, for example, when the distance between the eyes and the security element is about 5 cm or less, although it is not observed at the general viewpoint in the hidden effect observation unit 230 . In addition to the hidden effect observation unit 230, the first moire magnification image 210 by the first micro image array 130 and the third moire magnification image 240 by the second micro image array 142 ) Can be observed.

The third moire enlarged image 240 may be observed at a depth different from that of the first moire enlarged image 210. Such a stereoscopic effect may be formed by arranging the second micro image 142 in the area other than the hidden effect observing part 230 And adjusting the period. For example, if the array period of the first micromirrors 132 is made smaller than the array period of the microlenses 121 (for example, 0.9), the first moiré magnification image 210 appears to be inside the surface, When the arrangement period of the second microimages 142 in the area other than the effect observation unit 230 is made larger than the arrangement period of the microlenses 121 (for example, 1.1), the third moiré enlargement image 240 protrudes out of the surface As shown in FIG.

13 (a), the second micro image 142 in the hidden effect observation unit 230 and the other areas may have different arrangement periods, different image types, shapes, sizes, colors, etc. have.

Also, the arrangement period of the first micro images 132, the type, shape, size, color, etc. of the image are not necessarily constant over the entire area of the security element, and may vary depending on the area. Therefore, a new stereoscopic effect can be given such that different moire enlarged images are observed depending on the security element area.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. For example, the security element of the present invention is not limited to forming only one kind of micro images in one image forming layer, and a plurality of kinds of micro images may be formed. At this time, different kinds of micro images may be formed according to the regions as shown in FIG. 13, but it is also possible that different types of micro images are formed in the same area.

In addition, the technical ideas described in the embodiments may be independently performed, or may be combined with each other. Accordingly, the scope of protection of the present invention should be determined by the description of the claims and their equivalents.

100, 200, 300, 400, 510, 610, 710, 1000:
110: substrate
120: micro lens array
121: Micro lens
130: first micro image array
131: first image forming layer
132: 1st micro image
140: second micro image array
141: Second image forming layer
142: second micro image
210: 1st moiré enlarged image
220: The second moiré enlarged image
230: Hide effect monitor
240: The third moiré enlarged image
310: protective layer
410: reflective layer
500, 600, 700: Security products
800: Activation module
900: Activation device

Claims

materials;
A microlens array in which a plurality of microlenses are formed in a predetermined arrangement period on the upper side of the substrate;
A first micro image array in which a plurality of first micro images are formed in a first arrangement period at a lower portion of the substrate; And
A second micro image array in which second micro images are formed in a second arrangement period under the first micro image array;
Lt; / RTI >
The array period of any one of the first array period and the second array period is an array period different from the predetermined array period of the microlenses and the other array period is the same array period as the predetermined array period of the microlenses ,
Wherein the first micro-image array and the second micro-image array are all located within the focal depth of the micro-
A first moire magnification image appearing from the first micro image array and a second moire magnification image appearing from the second micro image array, wherein the observer's eye is spaced apart from the security element surface by a first viewing distance, Only one of the first moire magnification image and the second moire magnification image is observed, and when observing in a state of being apart from the first observation distance by a second observation distance close to the surface of the security element, The other of the image and the second moiré magnification image is observed,
Further comprising one or more micro image arrays in addition to the first and second micro image arrays, or by varying the arrangement period of the first and second micro image arrays according to the area of the security element, Characterized in that in addition to the magnified image, one or more other moire magnification images are further observed.

The method according to claim 1,
And a protective layer is further formed on the microlens array.

materials;
A first micro image array in which a plurality of first micro images are formed in a first arrangement period at a lower portion of the substrate;
A second micro-image array in which a plurality of second micro-images are formed in a second arrangement period under the first micro-image array;
A microlens array in which a plurality of microlenses are formed at a predetermined arrangement period under the second micro image array;
A reflective layer formed under the microlens array;
/ RTI >
The array period of any one of the first array period and the second array period is an array period different from the predetermined array period of the microlenses and the other array period is the same array period as the predetermined array period of the microlenses ,
Wherein the first micro-image array and the second micro-image array are all located within the focal depth of the micro-
A first moire magnification image appearing from the first micro image array and a second moire magnification image appearing from the second micro image array, wherein the observer's eye is spaced apart from the security element surface by a first viewing distance, Only one of the first moire magnification image and the second moire magnification image is observed, and when observing in a state of being apart from the first observation distance by a second observation distance close to the surface of the security element, The other of the image and the second moiré magnification image is observed,
Further comprising one or more micro image arrays in addition to the first and second micro image arrays, or by varying the arrangement period of the first and second micro image arrays according to the area of the security element, Characterized in that in addition to the magnified image, one or more other moire magnification images are further observed.

The method of claim 3,
Further comprising a gap-maintaining layer between the second micro-image array and the micro-lens array.

5. The method according to any one of claims 1 to 4,
And a hidden effect observing unit formed in a specific area of the security element,
Wherein the micro image array having the same arrangement period as the predetermined arrangement period of the microlenses among the first micro image array and the second micro image array is formed at least in the hidden effect observation section.

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5. The method according to any one of claims 1 to 4,
Wherein the first micro image and the second micro image are formed in different colors.

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5. The method according to any one of claims 1 to 4,
Wherein the focal plane of the microlens is located between the first micro image and the second micro image.

5. The method according to any one of claims 1 to 4,
Wherein the F-number of the microlenses is greater than or equal to two.

5. The method according to any one of claims 1 to 4,
Wherein the first micro image or the second micro image is intaglio printed in a recess formed in the image forming layer.

12. The method of claim 11,
The intaglio printing may include filling at least one of the colored ink, the color conversion ink, the metallic ink, the magnetic ink, the ultraviolet sensitive ink, the infrared sensitive ink, and the specific wavelength sensitive ink in the recess,
And a dielectric material or a metal material is vacuum-deposited in the recess.

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5. The method according to any one of claims 1 to 4,
Wherein the second viewing distance is 5 cm or less.

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A security product comprising the security element of any one of claims 1 to 4.

17. The method of claim 16,
Wherein the security element is attached to, or at least partially inserted into, the surface of the security product.

17. The method of claim 16,
Wherein the security element is included on a curved surface of the security product,
Wherein the arrangement period of the microlenses, the first and second micro images is corrected in consideration of arrangement period distortion caused by the curved surface.

19. The method of claim 18,
Wherein the correction is based on the following formula (1).
p = (r + t) / r ------ [Formula 1]
(where p is the difference in arrangement period distortion of the microlens array and the first or second micro image array, r is the radius of curvature of the curved surface, t is the distance between the microlens array and the first or second micro image array Distance)

An activation module for authenticating a security element of any one of claims 1 to 4,
A photographing unit for photographing a close-up of the security element;
An image analyzer for analyzing a moire enlarged image photographed by the photographing unit;
A characteristic value extracting unit for extracting a predetermined characteristic value of the analyzed moire enlarged image;
A reference value storage unit in which the design value of the characteristic value of the moire enlarged image is stored as a reference value;
An authentication unit for comparing the characteristic value extracted by the characteristic value extracting unit with a reference value stored in the reference value storage unit to authenticate whether the product is genuine;
An authentication result output unit outputting the authentication result;
And an activation module.

An activation device comprising the activation module of claim 20.

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A microlens array in which a plurality of microlenses are formed in a predetermined arrangement period;
A first micro image array formed at a predetermined distance from the microlens array and having a plurality of first micro images formed in a first arrangement period; And
A second micro image array spaced a predetermined distance from the first micro image array and having a plurality of second micro images formed in a second arrangement period;
Lt; / RTI >
The first micro image array and the second micro image array are located in the same direction (upper or lower) with respect to the microlens array,
Wherein the first arrangement period is different from the predetermined arrangement period of the microlenses, the second arrangement period is equal to the predetermined arrangement period of the microlenses,
Wherein the first micro-image array and the second micro-image array are all located within the focal depth of the micro-
Wherein the second micro image array includes a first area in which the second micro images are formed in a second arrangement period and a second area in which the second micro images are formed in a third arrangement period,
Wherein the third arrangement period is different from the predetermined arrangement period of the microlenses.

24. The method of claim 23,
Wherein the third arrangement period is different from the first arrangement period.

25. The method of claim 24,
Wherein a first moire magnification image appearing from the first micro image array and a third moire magnification image appearing from the second micro image array are simultaneously viewed in the second area.

24. The method of claim 23,
Wherein the second micro image is formed of different images in the first area and the second area.