KR20220075917A - Card with security element identification function with improved visibility - Google Patents

Abstract

The card having a security element identification function with improved visibility according to the present invention has a special layer structure, so even though a security element having a structural color is adopted, there is an effect of excellent visual identification, and identification of the security element in a general card use environment While being able to block the security element, the identification of the security element has an excellent effect in the environment where the identification of the security element is required.

Description

Card with security element identification function with improved visibility

The present invention relates to a card having a security element identification function with improved visibility.

Among security elements used in recent years, as security elements using optical properties, thin film structures, holograms using gratings, and color change devices using pigments are widely used. These security elements use light absorption, interference, and diffraction, and are increasingly easily forged due to the development of advanced radiation technology or computer-based scanning technology.

In general, as a method of realizing color, there is absorption of light by a dye, or a method called structural adj color as a photonic crystal structure made by periodically stacking thin films. The color realization method using the dye has the advantage of being relatively easy to manufacture, but it can be easily produced if the type of the dye is known, and there are no other security elements other than the color characteristics, so it is easy to forge or forgery. On the other hand, the security element using the structural color that uses the interference and diffraction of light by the structure has the advantage that it is not easy to forge or falsify due to the complicated structure.

These structural colors are widely applied in the way that various substances or living things produce colors in the natural world. If you look at the structure in detail, color is realized by controlling light with a nano-sized photonic crystal structure. For example, the blue color of the wings of Morpho butterfly is a representative structural color, and there is one that reflects blue light using a tree-like structure of tens to hundreds of nanometers in the wing area to realize the color.

However, compared to the security element through the absorption of light by the pigment, the security element through the structural color has a limit that the identification with the naked eye is significantly lowered. Therefore, the security element through structural color requires a technology to be applied to cards and the like so that it can be visually distinguished.

Korean Patent Registration No. 10-1222855

SUMMARY OF THE INVENTION It is an object of the present invention to provide a card having a security element identification function with improved visibility, including a security element having a structural color with excellent visual identification.

Another object of the present invention is to provide a card having an improved security element identification function, which can block the identification of a security element in a general card use environment, and has excellent visibility of the security element in an environment requiring identification of the security element .

A card according to the present invention comprises: a photosensitive color change layer in which visible light transmittance is reduced when irradiated with ultraviolet light, and visible light transmittance is increased when non-irradiated with ultraviolet light; and a security element layer laminated on the photosensitive color change layer and having a structural color.

In one embodiment of the present invention, the photosensitive color change layer comprises: a) an identification mode in which visible light transmittance is converted to x% or less and reflects (dark color, etc.) light in the visible region when irradiated with ultraviolet light; and b) a non-identification mode in which the visible light transmittance is converted to more than x% during non-irradiation of ultraviolet rays; may include (x: a real number of 0 to 80 independently of each other), the a) identification mode and b) non-identification The mode can be reversibly switched according to the presence or absence of UV irradiation.

In one embodiment of the present invention, the photochromic layer may include a base layer coated with a layer including a photochromic organic compound; or a base layer containing a photochromic organic compound in a matrix; may be, wherein the photochromic organic compound is Spirooxazine, Spiropyran, Fulgide, Thioindigo , and may include any one or two or more selected from triarylmethane.

In an example of the present invention, the laminate may further include a light reflection layer laminated on the other surface of the photosensitive color change layer on which the security element layer is laminated.

In an example of the present invention, the light reflection layer may be a transparent white-based sheet or an opaque white-based sheet.

In an example of the present invention, the light reflection layer may be a transparent white sheet, and the light transmittance may be 10% or less.

In an example of the present invention, the laminate may further include a transparent layer laminated on the upper portion of the security element layer or the lower portion of the photosensitive color change layer.

The card according to an embodiment of the present invention may further include a card-type housing layer in which a through hole or groove is formed, and the laminate may be inserted into the through hole or groove of the housing.

The card according to an embodiment of the present invention may further include a transparent layer laminated on the upper or lower portion of the card-type housing layer.

In one example of the present invention, the surface of the photosensitive color change layer on which the security element layer is laminated may consist of a laminated region on which the security element layer is laminated and an unstacked region on which the security element layer is not laminated, the card comprising: It may further include a card-type housing layer having a through-hole formed therein, wherein the card-type housing layer is laminated on the surface of the non-stacked region of the photochromic layer, and the security element layer is formed in the through-hole of the card-type housing layer. Can be stacked to be inserted.

A card according to an embodiment of the present invention includes a card-type housing layer in which a through hole or groove is formed; and a card-type transparent layer laminated on one surface of the card-type housing layer and having a through-hole formed therein, wherein the card-type transparent layer and the card-type housing layer correspond to each of the through-holes to form an integral through-hole. The stacked body may be inserted into the through-hole, the security element layer may be inserted to be positioned in the through-hole of the card-type housing layer, and the photosensitive color change layer may be inserted into the through-hole of the card-type transparent layer. It can be inserted so as to be located in

The card having a security element identification function with improved visibility according to the present invention has an excellent effect of visual identification even though the security element having a structure color is adopted.

In addition, the card having a security element identification function with improved visibility according to the present invention can block the identification of the security element in a general card use environment, and there is an excellent effect of identification of the security element in an environment requiring the identification of the security element.

1 to 3 are views schematically showing the layer structure of a card according to the present invention.
4 is an image showing a comparison of the difference in discrimination according to the presence or absence of ultraviolet irradiation of the card according to the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the stacked body for identification of the security element and a card including the same according to the present invention.

The drawings described in this specification are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Therefore, the present invention is not limited to the drawings presented and may be embodied in other forms, and the drawings may be exaggerated to clarify the spirit of the present invention.

Unless otherwise defined in technical terms and scientific terms used in this specification, those of ordinary skill in the art to which this invention belongs have the meanings commonly understood, and in the following description and accompanying drawings, the subject matter of the present invention Description of known functions and configurations that may unnecessarily obscure will be omitted.

A singular form of a term used herein may be construed to include a plural form as well unless otherwise indicated.

Unless otherwise specified, the unit of % used in the present specification means % by weight unless otherwise specified.

As used herein, the term “layer” or “film” means that each material forms a continuum and has a dimension with a relatively small thickness compared to width and length. Accordingly, the terms “layer” or “film” in this specification should not be interpreted as a two-dimensional flat plane.

Conventionally, when a security element including a structural color is used to increase security, the visibility of the structural color is remarkably deteriorated, and there is a limitation in that it is difficult to identify with the naked eye. The structural color has a difference in visibility depending on the amount of ambient light and the viewing angle. In particular, the structural color has a large difference in visibility according to the difference in absorption and reflection of light on the other side of the structural color in the direction of viewing the structural color.

Accordingly, the present invention provides a card including a security element with significantly improved visibility while being able to use the conventional security element including the structural color as it is, and in addition, in some cases, the identification of the security element is required only in an environment where the identification of the security element is required. By enabling identification, it provides a card with significantly improved security, such as preventing recognition of whether a security element has been applied or not.

The card according to the present invention includes a photosensitive color change layer 10 having reduced visible light transmittance when irradiated with ultraviolet light and increased visible light transmittance when non-irradiated with ultraviolet light; and a security element layer 20 laminated on the photosensitive color change layer 10 and having a structural color.

As shown in Fig. 4, the security element layer 20 having a structural color is usually a security shape formed on a transparent substrate layer, and the security shape is opaque or made of a material having a relatively low light transmittance compared to the background color on the substrate layer. is drawn and formed on Therefore, when the security element layer 20 having the structural color is applied to the card as it is, visibility and security are significantly reduced. However, in the present invention, the photosensitive color change layer 10 having a visible light transmittance that changes depending on the presence or absence of UV irradiation is laminated on one surface of the security element layer 20 having a structural color, so that visibility and security are remarkably improved.

Since the security element layer 20 having a structural color is widely known, reference may be made to the known literature, for example, Korean Patent Registration No. 10-1222855 may be referred to. As a specific example, the method of manufacturing the security element layer 20 includes a master manufacturing step (S11), a master mold manufacturing step (S12), and a metal-dielectric thin film sample manufacturing step ( S13) and a security element manufacturing step (S14) may be included. The master (master) manufacturing step (S11) may be a step of manufacturing a master (master) having a plurality of concave portions formed on the upper surface. The master mold manufacturing step ( S12 ) may be a step of manufacturing a master mold by plating an upper surface of the master. The metal-dielectric thin film sample preparation step ( S13 ) may be a step of manufacturing a metal-dielectric thin film sample by stacking a metal-dielectric thin film on a substrate. In this case, in the step of preparing the metal-dielectric thin film sample ( S13 ), the metal-dielectric thin film may be stacked in multiple layers on the substrate. The security element manufacturing step (S14) is the metal-dielectric thin film sample by imprinting the master mold (imprint) on the double reflectivity (bi-reflectivity) characteristics and color characteristics according to polarization (polarization) It may be a step of manufacturing the security element.

In the present invention, in the case of normal times when ultraviolet rays are not irradiated, the visible light transmittance of the photosensitive color change layer 10 laminated on the other surface of the security element layer 20 is maintained in a high state, so that the other surface side of the security element layer 20 is According to the brightness, the visibility of the structure color on the security element layer 20 as shown in the left image of FIG. 4 is very poor. When ultraviolet rays are irradiated, the visible light transmittance of the photosensitive color change layer 10 laminated on the other surface of the security element layer 20 is reduced, so that the other surface of the security element layer 20 is darkened. Similarly, the visibility of the structural color on the security element layer 20 is significantly improved.

Preferably, the photosensitive color change layer 10 includes: a) an identification mode in which the visible light transmittance is converted to x% or less and reflects light in a wavelength range of 300 to 450 nm, preferably 300 to 400 nm, when irradiated with ultraviolet rays; and b) a non-identification mode in which the visible light transmittance is converted to more than x% during non-irradiation of ultraviolet rays; Here, x in the a) identification mode and x in the b) non-identification mode are each independently 0 to 80, specifically, a real number of 0 to 70, more specifically 10 to 70, and even more specifically 20 to 70.

In the identification mode, when ultraviolet light is irradiated to the photosensitive color-change layer 10 , the photo-sensitive color-change layer 10 reflects light in a wavelength region in the above-described range, thereby causing an observer to view the other surface of the security element layer 20 . This black (Dark gray) series is observed at the same time as the structure color of the security element layer 20 is clearly shown. In this way, as the photosensitive color change layer 10 is converted from transparent to black series by UV irradiation, the structural color of the security element layer 20 laminated thereon is clearly and clearly identified.

The photosensitive color-changing layer 10 is not limited as long as it includes a photochromic material whose visible light transmittance is reduced when irradiated with ultraviolet rays and whose visible light transmittance is increased when irradiated with ultraviolet rays, and is generally opaque when irradiated with ultraviolet rays and is transparent when irradiated with ultraviolet rays. It may mean a layer that is released. As a specific example, the photochromic layer 10 may include a base layer coated with a layer including a photochromic material; or a substrate layer containing a photochromic material in a matrix; may be. In this case, the base layer may be a transparent layer, and the matrix may be usually a polymer, but is not limited thereto. For example, the photochromic material maintains a transparent state in which light is transmitted and the opposite side is visible in normal times when no ultraviolet rays are irradiated, but when ultraviolet rays are irradiated, the visible light transmittance is relatively reduced and the opposite side is substantially invisible. It may refer to a material that imparts a reversible conversion of optical properties to the photosensitive color change layer 10 . Examples of the material include any one or two or more selected from spirooxazine, spiropyran, fulgide, thioindigo, triarylmethane, etc. and photochromic organic compounds. In addition, photochromic coordination compounds, photochromic inorganic compounds, etc. can also be used, and may be generally referred to as photosensitive dyes, which are well-known, so it is okay to refer to the known literature.

As the photochromic organic compound according to an embodiment of the present invention, a compound represented by the following Chemical Formula 1 may be exemplified, but the present invention is not limited thereto.

[Formula 1]

The photochromic layer 10 may include a photosensitive region containing the photochromic material in which optical characteristics change is formed throughout the layer, and includes the photosensitive region and a non-photosensitive region not containing the photochromic material. it may have been done

As a preferred example, the laminate may further include light reflection layers 30 and 30 that are laminated on the other surface of the photosensitive color change layer 10 on which the security element layer 20 is laminated. When the light reflective layer 30 is further applied, the other side of the security element is observed brightly in the direction in which the light reflective layer 30 looks at the structural color of the security element by the light reflective layer 30 in an environment where ultraviolet rays are not irradiated, so visibility is sharply reduced. . Therefore, by making it possible to identify the security element only in an environment where identification is required, the security is remarkably improved by making it impossible to recognize whether the security element has been applied or not.

The light reflection layer 30 may be a transparent white-based sheet or an opaque white-based sheet, and preferably, the light transmittance in terms of allowing the other side of the security element to be observed brighter in the direction in which the structure color of the security element is viewed. This 10% or less may be a transparent white-based sheet, and more preferably an opaque white-based sheet.

In one example of the present invention, the laminate may further include a transparent layer laminated on the upper portion of the security element layer 20 or the lower portion of the photosensitive color change layer 10 . The transparent layer may serve to protect the security element layer 20 and the photochromic layer 10 .

Hereinafter, a structure that can actually have a card according to the present invention will be described with reference to various examples along with FIGS. 1 to 3 .

As shown on the left side of FIG. 1 , the card according to an embodiment of the present invention may further include a card-type housing layer 40 having a through hole or groove formed therein, and a through hole or groove of the housing 40 . It may be that the laminate is inserted into the.

In the present specification, the size of the through hole or groove may be appropriately adjusted according to the size of the security element, and the size of the security element may also be appropriately controlled according to the purpose and use, and thus is not limited.

1, the card according to an embodiment of the present invention may further include a transparent layer 50 laminated on the upper and/or lower portion of the card-type housing layer 40, or It may further include the light reflection layers 30 and 30 stacked on the upper and/or lower portions of the card-type housing layer 40 . The transparent layer 50 may serve to protect the security element layer 20 , the photochromic layer 10 , and the card-type housing layer 40 .

As shown on the left side of FIG. 2 , in an example of the present invention, the surface of the photosensitive color-change layer 10 on which the security element layer 20 is laminated is the stacked area on which the security element layer 20 is laminated and the security element layer 20 is laminated. The element layer 20 may be formed of an unstacked region in which the layer is not stacked, and the card may further include a card-type housing layer 40 having a through-hole formed therein, and the card-type housing layer 40 may be It is laminated on the surface of the non-stacked region of the sensitive color change layer 10 , and may be laminated so that the security element layer 20 is inserted into the through hole of the card-type housing layer 40 . Also, as shown on the right side of FIG. 2 , the card may further include a transparent layer 50 stacked on top of the security element layer 20 and the card-type housing layer 40 . The transparent layer 50 may serve to protect the security element layer 20 and the card-type housing layer 40 .

As shown on the left side of Figure 3, the card according to an embodiment of the present invention, the card-type housing layer 40 is formed with a through hole or groove; and a card-type transparent layer 60 laminated on one surface of the card-type housing layer 40 and having a through-hole formed therein, wherein the card-type transparent layer 60 and the card-type housing layer 40 are each The through-holes may be stacked correspondingly to form an integral through-hole, and the stacked body is inserted into the through-hole, so that the security element layer 20 is positioned in the through-hole of the card-type housing layer 40 . may be inserted, and the photosensitive color change layer 10 may be inserted so as to be positioned in the through hole of the card-type transparent layer 60 . Also, as shown on the right side of FIG. 3 , the card may further include a transparent layer 50 laminated on the security element layer 20 and the card-type housing layer 40 . The transparent layer 50 may serve to protect the security element layer 20 and the card-type housing layer 40 .

The card-type transparent layer and the card-type housing layer may be any structure including the outer surface of the card, and may include, for example, a display on which a pattern, text, or picture is printed on the outer surface of the card. As a specific example, the card-type transparent layer and the card-type housing layer may be a lasable sheet, which partially or entirely covers the sub-pixels R, G, and B on the transparent sheet through a laser beam. (mask), dark, non-reflective surfaces to form gray levels of high-quality, personalized laser images, so that text, glyphs, etc. are engraved or printed on transparent sheets it may have been

The thickness of the “layer” referred to in this specification is not particularly limited because it can be appropriately adjusted as long as it can have the shape, standard, etc. of a conventional card. As a specific example, the average thickness of the photochromic layer 10 may be 50 to 500 μm, specifically 75 to 300 μm, and the average thickness of the security element layer 20 is 50 to 500 μm, specifically 75 to 300 μm. It may be a μm, and the average thickness of the light reflection layer 30 may be 50 to 500 μm, specifically 75 to 300 μm. In addition, the thickness of the laminate to which each layer is added, that is, the average thickness of the card may be 300 to 1,000 μm, specifically, 500 to 1,000 μm. However, this is only described as a preferred example, and the present invention is not construed as being limited thereto.

The “layer” referred to in the present specification is not particularly limited as long as it is a material that satisfies the above-described properties/effects of each layer, and various components such as polymer series, metal series, and inorganic series may be used as main components. As a specific example, the polymer series is polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polystyrene (PS), polycarbonate (PC), polymethyl methacrylate (PMMA) ), polyethersulfone (PES), polyvinylidene fluoride (PVDF), polyetherketone (PEEK), polyphenylsulfide (PPS), and may include any one or two or more selected from aromatic polyester. As a specific example, the metal series may include any one or two or more selected from aluminum, copper, iron, and magnesium. As a specific example, the inorganic group may include any one or two or more selected from paper, wood, stone, and glass.

Although the “card” according to the present invention is expressed in a rectangular shape in the drawings, there are no restrictions on its shape and specifications, such as n-shaped (n is 3 or more), circular, oval, and n-gonal (n is 3 or more) with rounded corners. No, as a typical card, a rectangular card with rounded corners can be exemplified.

10: photochromic layer, 20: security element layer,
30: light reflection layer, 40: housing layer,
50: transparent layer, 60: card-type transparent layer

Claims (12)

a photosensitive color change layer having a reversible light characteristic in which visible light transmittance is reduced when irradiated with ultraviolet light, and visible light transmittance is increased when non-irradiated with ultraviolet light; and
A card comprising a laminate comprising a; a security element layer laminated on the photosensitive color change layer and having a structural color. The method of claim 1,
The photosensitive color-changing layer is a card that reflects light in a wavelength region of 300 to 400 nm when irradiated with ultraviolet light. 3. The method of claim 2,
The photosensitive color change layer,
a) an identification mode in which the visible light transmittance is converted to x% or less when irradiated with ultraviolet rays; and
b) a non-identification mode in which the visible light transmittance is converted to more than x% during non-irradiation of ultraviolet rays; including (x: a real number of 0 to 80 independently of each other),
A card in which a) identification mode and b) non-identification mode are reversibly switched depending on the presence or absence of UV irradiation. 4. The method of claim 3,
The photochromic layer may include a base layer coated with a layer including a photochromic organic compound; or a base layer containing a photochromic organic compound in a matrix; and
The photochromic organic compound is any one or two or more selected from spirooxazine, spiropyran, fulgide, thioindigo, and triarylmethane card containing. According to claim 1,
The laminate is
The card further comprising a light reflective layer laminated on the other surface of the photosensitive color change layer on which the security element layer is laminated. 6. The method of claim 5,
The light reflection layer is a transparent white-based sheet or an opaque white-based sheet. 7. The method of claim 6,
The light reflective layer is a transparent white sheet, the card having a light transmittance of 10% or less. According to claim 1,
The laminate is
The card further comprising a transparent layer laminated on the upper portion of the security element layer or on the lower portion of the photochromic layer. The method of claim 1,
The card is
It further comprises a card-type housing layer in which a through hole or groove is formed,
A card into which the stacked body is inserted into a through hole or groove of the housing. 10. The method of claim 9,
The card is
The card further comprising a transparent layer laminated on the upper or lower portion of the card-type housing layer. According to claim 1,
The surface of the photosensitive color change layer on which the security element layer is laminated consists of a laminated region on which the security element layer is laminated and an unstacked region on which the security element layer is not laminated,
The card is
It further comprises a card-type housing layer having a through hole formed therein,
The card-type housing layer is laminated on the surface of the non-stacked region of the photosensitive discoloration layer, the card being laminated so that the security element layer is inserted into the through hole of the card-type housing layer. The method of claim 1,
The card is
a card-type housing layer in which a through hole or groove is formed; and
It further includes; a card-type transparent layer laminated on one surface of the card-type housing layer, the through-hole is formed,
The card-type transparent layer and the card-type housing layer are stacked correspondingly so that each through-hole forms an integral through-hole,
The laminate is inserted into the integral through-hole, the security element layer is inserted to be positioned in the through-hole of the card-type housing layer, and the photochromic layer is inserted to be positioned in the through-hole of the card-type transparent layer. card.

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