KR102460572B1 - Anti-counterfeiting means for improving visibility by using brightness contrast relation, manufacturing method thereof, and forgery authentication method using the same - Google Patents

Abstract

An objective of the present invention is to provide a forgery prevention means including a highly visible polarization layer. The present invention relates to a forgery prevention means including: a base layer; and a display layer disposed on an upper side of the base layer, printed with liquid crystal ink or provided with a colored liquid crystal film, and having latent identification patterns that are not visually identified in a non-polarized light irradiation state. The color expressed on the display layer in a state in which polarized light is irradiated is a color that has a relationship of chroma contrast with a dye applied to the base layer.

Description

{Anti-counterfeiting means for improving visibility by using brightness contrast relation, manufacturing method thereof, and forgery authentication method using the same}

The present invention relates to a forgery prevention means for improving visibility using a chroma contrast relationship, a manufacturing method thereof, and a forgery authentication method using the same.

Various methods such as light authentication, thermal authentication, pressure authentication, and magnetic authentication are used as authentication methods for preventing forgery. The authentication method that allows the hidden mark to be revealed is increasingly used and advanced.

As one of the polarized liquid crystals that can be authenticated for forgery, there is a cholesteric liquid crystal in which molecules are twisted at a certain angle to form a spiral structure for each layer, which has been applied to LCD panels mainly used in mobile phones. is being used

Cholesteric liquid crystal has a unique property of selectively reflecting light according to the twisted direction of the spiral and the pitch of the repeating structure to express a specific color. Visibility is one of the most important factors in

As a method to increase visibility, the cholesteric liquid crystal itself may be designed and improved to have excellent reflectivity or color expression, which is a method that has been used in many prior art.

However, in the case of the prior art, there is a problem in that it is difficult to ensure visibility in certain situations, such as when the intensity of light is lowered, the camera performance is poor, or the label is contaminated. There is a need to maximize the relative visibility resulting from the relationship.

An object of the present invention is to provide a forgery prevention means including a polarizing layer with high visibility.

In addition, an object of the present invention is to enable the authentication device to better recognize the hidden pattern of the forgery prevention means.

In addition, an object of the present invention is to diversify detailed authentication techniques within the optical authentication method using polarized light.

According to an embodiment of the present invention, the base layer; and a display layer disposed on the upper side of the base layer, printed with liquid crystal ink or provided with a colored liquid crystal film, and having a latent image identification pattern that is not visible to the naked eye in a state in which non-polarized light is irradiated; The color expressed on the display layer in the irradiated state can provide a forgery prevention means, characterized in that it is a color having a chroma contrast relation with the dye applied to the base layer.

In an exemplary embodiment, the chroma contrast relation may have a difference in chroma values of 7 or more in a color system of A. H. Munsell (Munsell).

In an exemplary embodiment, the display layer includes a first display layer including cholesteric liquid crystal microcapsules; and a second display layer including cholesteric liquid crystal microcapsules having a different orientation from that of the first display layer, wherein the colors expressed when polarized light is irradiated to the first display layer and the second display layer are mutually saturated. It may be a color forming a contrasting relationship.

In an exemplary embodiment, a color synchronization ratio of the first display layer and the second display layer may be 95% or more based on visual observation in a state in which the non-polarized light is irradiated.

In an exemplary embodiment, the display layer includes a first display layer including cholesteric liquid crystal microcapsules; and a second display layer printed with general ink that does not contain cholesteric liquid crystal microcapsules, wherein the color expressed in the first display layer is chroma contrast with that of the dye included in the second display layer. It can be a color that makes up a relationship.

In an exemplary embodiment, the display layer further comprises a design print layer disposed between the base layer and the display layer and having a specific pattern printed with general ink, wherein the display layer is laminated on top of the design print layer, The color expressed on the display layer in a state in which the polarized light is irradiated may be a color having a color saturation contrast relation with a color of a dye included in the general ink printed on the design printing layer.

In an exemplary embodiment, the display layer includes a first display layer including cholesteric liquid crystal microcapsules; and a second display layer; and a third display layer comprising cholesteric liquid crystal microcapsules, wherein the color expressed when polarized light is irradiated to the first display layer is mutually saturated with the color of the dye included in the base layer or the second display layer. A contrast relationship is formed, and a color expressed when polarized light is irradiated to the third display layer may have a similar chroma relationship with the color of the dye included in the base layer or the second display layer.

In an exemplary embodiment, the chroma contrast relation may have a difference in chroma values of 2 or less on a color system of A. H and Munsell.

In an exemplary embodiment, in the forgery authentication method of the forgery prevention means, a first authentication step of recognizing a first pattern expressed through the first display layer through a display device to the display layer irradiated with polarized light; and a second authentication step in which a second pattern expressed through the second display layer is recognized through a display device;

In an exemplary embodiment, the first authentication step may be performed sequentially or simultaneously through the display device.

According to an embodiment of the present invention, the base layer; a design printing layer disposed on the upper side of the base layer and having a specific pattern printed with general ink; and a display layer disposed on the upper side of the design print layer, printed with liquid crystal ink or provided with a colored liquid crystal film, and having a latent image identification pattern that is not discernible with the naked eye in a state where non-polarized light is irradiated; In this irradiated state, the color expressed in the display layer can provide a forgery prevention means, characterized in that it is a color forming a color saturation contrast relation with the color of the dye included in the general ink printed on the design printing layer.

According to an embodiment of the present invention, the base layer; and a display layer disposed on the upper side of the base layer, printed with liquid crystal ink or provided with a colored liquid crystal film, and having a latent image identification pattern that is not discernible with the naked eye in a state where non-polarized light is irradiated. The layer includes a first display layer and a second display layer, and is included in each of the first display layer and the second display layer so that the colors expressed in the display layer in a state in which polarized light is irradiated have a chroma contrast relation with each other. It is possible to provide a forgery prevention means, characterized in that.

In an exemplary embodiment, a stretched film disposed on the upper side of the display layer to improve visibility during photo authentication; may further include.

It is possible to provide a forgery prevention means, characterized in that.

According to an embodiment of the present invention, it is possible to provide a method of manufacturing the forgery prevention means.

In an exemplary embodiment, the ink containing the cholesteric liquid crystal of the present invention may include an oil solvent and an organic polymer.

In an exemplary embodiment, the oily solvent of the present invention is preferably n-methylpyrrolidone (N-methylpyrrolidone), methylethyl ketone, toluene, cyclohexanone, and these It may be an oily solvent selected from the group containing a mixture of

In an exemplary embodiment, the organic polymer of the present invention may be a heat-curable or light-curable adhesive. Preferably, the thermosetting polymer is a polyurethane-based polymer, a polyvinylalcohol-based polymer, a polyacryl-based polymer, an epoxy-based polymer, a melamine-based resin, or an isocyanate. It may be selected from the group comprising polymer-based polymers, cellulose derivatives, and mixtures thereof. The photo-curable adhesive may be selected from the group including acrylate-based, epoxy-based, vinyl-based monomers, and mixtures thereof.

In an exemplary embodiment, the anti-counterfeiting medium of the present invention may be preferably a label, sticker, packaging material or paint.

In an exemplary embodiment, the specific pattern for determining whether the forgery or not of the present invention may be a barcode or QR code, and most preferably, a QR code.

In an exemplary embodiment, the term 'counterfeiting' as used herein refers to any act of creating a new non-existing object for the purpose of use by an unauthorized person, or any act of changing an existing object without authorization can do.

The present invention has the effect of providing a forgery prevention means including a polarizing layer with high visibility.

In addition, the present invention has the effect of allowing the authentication device to better recognize the hidden pattern of the forgery prevention means.

In addition, the present invention has an effect of diversifying detailed authentication techniques even within the optical authentication method using polarized light.

1 is a schematic diagram of the structure of a cholesteric liquid crystal ink and liquid crystal.
Figure 2 shows a cross section of the forgery prevention means according to an embodiment of the present invention.
3 is a schematic diagram of the Munsell color system.
4 shows a cross-section of a forgery prevention means according to another embodiment of the present invention.
5 shows a cross-section of a forgery prevention means according to another embodiment of the present invention.
6 is a view showing a state of being viewed using a polarizing film (polarized viewer), with the forgery prevention means without the stretched film layer and the forgery prevention means including the stretched film layer of FIG. 5 side by side.
7 shows a state of checking whether forgery or not using a mobile phone screen.
8 shows a state of checking whether forgery or not using a polarizing film.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows the molecular arrangement state of a cholesteric liquid crystal used in a means for preventing forgery using polarized light. It is confirmed that the molecules are arranged differently in each planar layer, but rotate in a spiral shape toward the top or bottom. can

When polarized light is irradiated on the surface of the cholesteric liquid crystal, various colors and patterns are externally expressed depending on the arrangement state of the molecules, and this latent image expression technology can be applied to the display layer of the forgery prevention means described below.

Hereinafter, the forgery prevention means 100 according to an embodiment of the present invention will be described with reference to FIG. 2 .

Forgery prevention means according to an embodiment of the present invention is a base layer 110, a design print layer 120 laminated on the upper side of the base layer and printed with general ink, the base layer 110 or the design print layer. The display layer 130 is laminated on the upper side and printed with cholesteric liquid crystal ink to include a hidden mark.

The base layer 110 may be located in the lowermost layer of the forgery prevention means 100, and various film layers used for manufacturing labels in the art, such as synthetic resin, paper, and metal, may be used.

The design print layer 120 is printed with general ink that can be visually confirmed even in a state in which non-polarized light is irradiated on the base layer 110, and consists of a pattern distinct from the display layer 130 to be described later. can be

In addition, the patterns constituting the design print layer 120 can be configured in various shapes and colors. It is preferable to be provided with a pattern that can be digitally authenticated by a display device, such as a QR code or a BAR code.

On the other hand, the display layer 130 may be printed on the substrate layer 110 or printed on the design printing layer 120 when the design printing layer 120 is provided, the first display layer 131 and A second display layer 132 may be included.

The display layer 130 may have a printing thickness of 15 μm or less. In printing the display layer 130 on the design print layer 120 or the substrate layer 110 , a key factor related to applicability is the thickness of the print layer. In terms of thickness, if the thickness of the printing layer is thick, there may be a problem in that the available printing substrate is limited or printing is impossible.

The lower limit of the average size of ink particles available for actual printing is 15 μm (eg, silkscreen printing method), and the average ink particle size of more advanced printing methods (eg, gravure printing method, offset printing method) is less than 5 μm.

Therefore, the thickness of the display layer 150 according to an embodiment of the present invention may be 15 μm or less, and more preferably 5 μm or less because the thickness of the printed layer should be larger in order to be applied to packaging materials. can

Meanwhile, both the first display layer 131 and the second display layer 132 may be printed with cholesteric liquid crystal ink, and any one of the first display layer 131 and the second display layer 132 may be printed. Only the display layer may be printed with cholesteric liquid crystal ink, and the remaining display layers may be printed using general ink.

When both the first display layer 131 and the second display layer 132 are printed using cholesteric liquid crystal ink, the orientation of the cholesteric liquid crystal used in each display layer may be different, and through this, each other By irradiating polarized light, different colors are identified, so that a hidden mark can be identified to check forgery or not.

In addition, the first display layer 131 and the second display layer 132 may be printed with the same color or ink that appears to have the same color at a glance in a state in which the non-polarization is irradiated, and more specifically, the non-polarized light is irradiated. In this state, the color synchronization ratio of the first display layer and the second display layer is preferably 95% or more based on visual observation.

This is because, in some cases, the activation method is disclosed to the outside, otherwise, if only the seller or the anti-counterfeiting service provider can check whether the product is a fake, consumers or a third party who produces or distributes the fake product can use this activation method. This is so that it cannot be seen and measured with the naked eye.

Meanwhile, the cholesteric liquid crystal powder may be a cholesteric liquid crystal microcapsule, and the cholesteric liquid crystal microcapsule may have a printable average diameter of about 10 μm.

In the display layer 130 provided with ink containing cholesteric liquid crystal, the weight of cholesteric liquid crystal powder contained based on the total weight of ink containing cholesteric liquid crystal may account for 1-30%, and the remaining At least a portion of the weight may be occupied by at least one of the general inks.

In addition, in the display layer including the cholesteric liquid crystal among the display layers, the cholesteric liquid crystal powder and the thermosetting binder may be mixed with each other, and the weight of the cholesteric liquid crystal powder is the base layer ( 110) or the design printing layer 120 and the maximum possible adhesion may be 30% or less.

At this time, in consideration of adhesiveness and stability, the thermosetting binder is preferably provided as an acrylic acid-based binder.

In addition, as the weight of the cholesteric liquid crystal powder increases, visibility during authentication may be higher.

In addition, among the total weight of the ink including the cholesteric liquid crystal, at least a portion of the remaining weight except for the weight of the cholesteric liquid crystal may be occupied by a nematic liquid crystal or a liquid crystal polymer, not a general ink.

Through this, a part of the total weight of the ink is composed of cholesteric liquid crystal and the remaining part is composed of nematic liquid crystal or liquid crystal polymer, and a current flows through it to adjust the orientation angle of the nematic liquid crystal or liquid crystal polymer to reduce polarization during authentication. When illuminated, the front and rear colors can be reflected differently.

Meanwhile, the first display layer 131 and the second display layer 132 include phosphorescence ink, thermochromic ink, and photochromic ink, in addition to liquid crystal ink containing cholesteric liquid crystal. ink), optical variable ink, magnetic ink, humidity ink, and pressure ink may be printed with at least any one of.

On the other hand, in order to improve visibility during authentication, the liquid crystal ink constituting the display layer 130 shows a chroma contrast relation between the color expressed in the display layer under polarized light and the dye applied to the base layer 110 . It may be a color forming.

In addition, the color expressed in a state in which polarized light is irradiated to the liquid crystal ink may be a color having a chroma contrast relation with the dye applied to the base layer 110 or the dye included in the design printing layer 120 .

In the present specification, the saturation contrast relationship refers to a color relationship in which the saturation difference is more than a predetermined value from each other in the color system system of A. H, Munsell. may mean a combination of

In the present specification, as for the saturation contrast relation, the difference in the chroma value on the color system of A. H. Munsell may be 7 or more, preferably 8 or more.

According to this embodiment, the color of the display layer 130 can be visibly contrasted with the base layer 110 or the design print layer 120 when polarized light is irradiated, so that the hidden mark can be more clearly expressed during photo authentication. .

On the other hand, this embodiment can be applied even when the display layer 130 uses temperature, magnetism, pressure, or humidity authentication instead of the photo authentication method, and displays as temperature changes, magnetism or pressure is applied, or humidity changes. The color expressed in the layer 130 may have a chroma contrast relation with the color of the base layer 110 or the design print layer 120 .

Fig. 3 is a color wheel of A. H, Munsell, where the chroma contrast relation refers to the relationship between the chroma value 2 and the chroma value 9 on the radial (chroma) line representing the chroma. , preferably 8) may be defined as a relationship in which visibility is maximized when contrasted adjacent to each other.

In addition, the pseudo-chroma relationship (1) defined in this specification is a predetermined value (2, preferably 1) that is different from each other on the upper and lower chroma posts, such as the relationship between the chroma value 5 and the chroma value 6 in the radial direction (chroma) representing the chroma. It can be specified by a color relationship positioned so as to be different from each other, and in the case of a similar saturation relationship, it is a color relationship that can be perceived as a similar color with the naked eye when compared to each other adjacent to each other.

Hereinafter, a forgery prevention means according to another embodiment of the present invention will be described with reference to FIG. 4 , but differences from the above-described embodiment will be mainly described below in order to avoid repetitive description.

The display layer 130 may further include a third display layer 133 including cholesteric liquid crystal microcapsules in addition to the first display layer 131 and the second display layer 132 .

Specifically, the color that is contained in the cholesteric liquid crystal microcapsule of the first display layer 131 and is expressed when polarized light is irradiated is the color of the dye contained in the base layer 110 or the second display layer 132 and Colors that form a chroma contrast relationship with each other and are contained in cholesteric liquid crystal microcapsules in the third display layer 133 and are expressed when polarized light is irradiated are the base layer 110 or the design printed layer 120 or the second second display layer 133 . The color of the dye included in the display layer 132 may be provided to have a similar chroma relationship with each other.

Accordingly, during authentication, the first pattern expressed through the first display layer 131 may be clearly expressed, and the second pattern expressed through the third display layer 133 may be displayed on the base layer 110 . Alternatively, the expression may be blurred so as to be difficult to distinguish from the design print layer 120 or the second display layer 132 .

Through this, it is possible to maximize the security of the forgery prevention means by performing simultaneous authentication or two-step authentication using clear patterns and unclear patterns that are difficult to identify.

Hereinafter, with reference to FIG. 5, the forgery prevention means 100 according to another embodiment of the present invention will be described.

The forgery prevention means 100 according to another embodiment of the present invention includes an adhesive layer 140 laminated on the display layer, and a stretched film layer adhered to the adhesive layer 140 and stretching general plastic polymer molecules in a certain direction. (150) may be further included.

When the stretched film layer 150 is positioned on the display layer 130, the light refracted by the cholesteric liquid crystal ink is further refracted, so that the discrimination power of the identification pattern (hidden mark) can be increased during authentication.

The stretched film is preferably composed of an OPP Film (Bi-Axially oriented PP film) having improved optical properties and improved transparency.

6 is an experimental example in which the forgery prevention means not including the stretched film layer 150 and the forgery prevention means including the stretched film layer 150 are placed side by side and authenticated using a polarizing film (polarized viewer).

Here, it can be seen that the display layer 130 has a circular pattern, and the forgery prevention means including the stretched film layer 150 on the right side is brighter and has higher saturation than the left side.

That is, as can be seen in this experimental example, as a result of introducing and comparing the stretched film layer capable of refracting polarized light, it can be confirmed that the displayed color exhibits a more shiny visibility improvement effect.

The counterfeit prevention means on the right side used in the comparative experiment were a base layer containing synthetic PP paper, a design print layer containing a binder containing 15% silver powder, 10% cholesteric liquid crystal microcapsules with a liquid crystal content of 7%, and an acrylic binder. A first display layer printed by mixing, a second display layer printed by mixing 10% of cholesteric liquid crystal microcapsules with a liquid crystal content of 7% and 90% of an acrylic binder, and a 30 μm stretched film (OPP Film, Bi-Axially) oriented PP film) layer.

7 is an example illustrating a state in which light authentication is performed by irradiating polarized light from the liquid crystal of the mobile device so that the latent imaged identification pattern appears on the display layer 130, and FIG. 8 is the cholesteric film using a polarizing film. This is an example illustrating a state in which photo authentication is performed by allowing polarized light to reach the forgery prevention means 100 including the liquid crystal display layer so that a latent imaged identification pattern appears.

Hereinafter, the forgery authentication method of the forgery prevention means 100 performed through the mobile device 50 having the display will be described in detail.

In the forgery authentication method of the forgery prevention means 100 according to an embodiment of the present invention, the forgery prevention means 100 is photographed using a camera mounted on the display device, and the non-polarized light is irradiated with the naked eye. The first authentication step (S1) of checking whether forgery is prevented through the pattern, and the second authentication step of confirming whether the forgery prevention is prevented through the pattern confirmed in the state in which the polarized light is irradiated to the forgery prevention means 100 (S2) may be included.

In the case of the second authentication step (S2), which is polarization authentication, authentication may be performed in the manner described with reference to FIGS. 8 and 9 .

In addition, the secondary authentication step (S2) that is performed through the display device is a 2-1 authentication step (S2-1) of confirming the first pattern that is clearly expressed, and the second authentication step (S2-1) that is expressed in a blurry manner to precisely recognize the pattern. A 2-1 authentication step (S2-2) of confirming the second pattern may be included.

Even if the effect is not described in this specification, the present invention may additionally have different effects of each of the above-described components, and derive a new effect that cannot be seen in the prior art according to the organic coupling relationship between the above-described respective components. can do.

In addition, the embodiments shown in the drawings may be modified and implemented in other forms, and when implemented including the configuration claimed in the claims of the present invention or implemented within the scope of equivalents, it should be considered to belong to the scope of the present invention. something to do.

Forgery prevention means 100 Base layer 110
Design Print Layer 120 Display Layer 130
first display layer 131 second display layer 132
first display layer 133 adhesive layer 140
Stretched film layer 150

Claims (14)

base layer; and
A display layer disposed on the upper side of the base layer, printed with liquid crystal ink or provided with a colored liquid crystal film, and having a latent image identification pattern that is not visually discernable in a state where non-polarized light is irradiated;
The display layer is
a first display layer including cholesteric liquid crystal microcapsules; and
a second display layer; and
A third display layer comprising cholesteric liquid crystal microcapsules;
The color expressed when polarized light is irradiated to the first display layer has a chroma contrast relation with the color of the dye included in the base layer or the second display layer,
The color expressed when polarized light is irradiated to the third display layer has a similar chroma relationship with the color of the dye included in the base layer or the second display layer,
The color expressed on the display layer in a state where polarized light is irradiated is a color that has a chroma contrast relation with the dye applied to the base layer.
The chroma-to-saturation relationship is
It is a color relationship in which the difference in chroma in the color system of A. H, Munsell is 7 or more,
The pseudo-saturation relationship is
It is a color relationship located so as to be different from each other by a predetermined value or less on the upper and lower saturation posts,
a first authentication step of recognizing a first pattern expressed through the first display layer through a display device on the display layer irradiated with polarized light; and
A second authentication step in which a second pattern expressed through the second display layer is recognized through a display device;
Forgery prevention means, characterized in that. delete According to claim 1,
The display layer is
a first display layer including cholesteric liquid crystal microcapsules; and
a second display layer including cholesteric liquid crystal microcapsules having a different orientation from that of the first display layer;
The colors expressed when polarized light is irradiated to the first display layer and the second display layer are colors that have a chroma contrast relation with each other.
Forgery prevention means, characterized in that. 4. The method of claim 3,
In a state in which the non-polarized light is irradiated, the color synchronization rate of the first display layer and the second display layer is 95% or more based on visual observation.
Forgery prevention means, characterized in that. According to claim 1,
The display layer is
a first display layer including cholesteric liquid crystal microcapsules; and
a second display layer printed with general ink that does not contain cholesteric liquid crystal microcapsules;
The color expressed when polarized light is irradiated to the first display layer is a color having a chroma contrast relation with the color of the dye included in the second display layer.
Forgery prevention means, characterized in that. The method of claim 1,
A design printing layer disposed between the base layer and the display layer and formed with a specific pattern printed with general ink; further comprising,
The display layer is laminated on top of the design print layer,
The color expressed on the display layer in the state in which the polarized light is irradiated is
A color that has a contrasting relationship with the color saturation of the dye contained in the general ink printed on the design printing layer.
Forgery prevention means, characterized in that. delete According to claim 1,
The chroma-to-saturation relationship is
In Munsell's (A. H, Munsell's) color system, a color relationship in which the difference in chroma is less than 2
Forgery prevention means, characterized in that. In the forgery authentication method using the forgery prevention means according to any one of claims 1 and 8,
The first authentication step is performed sequentially or simultaneously through the display device.
Authentication method of forgery prevention means, characterized in that. delete delete delete According to claim 1,
A stretched film disposed on the upper side of the display layer to improve visibility during photo authentication; further comprising
Forgery prevention means, characterized in that. A method of manufacturing a forgery prevention means according to claim 1.

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