KR102474178B1 - Forgery Prevention Means Including a Cholesteric Liquid Crystal Display Layer and a Light Scattering Layer - Google Patents

Abstract

The present invention provides a forgery/alteration prevention means which comprises: a substrate; a printed layer disposed on the upper side of the substrate and having a first pattern printed thereon; a cholesteric liquid crystal display layer disposed on the printed layer and having a second pattern printed thereon; and an optical structure layer disposed on the cholesteric liquid crystal display layer and including a light scattering layer. According to the present invention, the forgery/alteration prevention means provides advantages of efficiently preventing forgery/alteration prevention when forgery/alteration is checked by emitting light of a light emitting means or screen of a forgery/alteration checking means, or the light of the screen, simplifying manufacture, decreasing manufacturing costs, detecting forgery/alteration without a separate forgery/alteration checking device, and significantly increasing visibility and quickly determining forgery/alteration by including the optical structure layer.

Description

Forgery Prevention Means Including a Cholesteric Liquid Crystal Display Layer and a Light Scattering Layer}

The present invention relates to a forgery prevention means including a cholesteric liquid crystal display layer and a scattering layer, and more particularly, to a substrate, a printed layer on top of the substrate, a cholesteric liquid crystal display layer on top of the printed layer, and the collet It relates to a forgery prevention means including an optical structure layer including a scattering layer on top of a stereo liquid crystal display layer.

Due to industrial development in the 21st century, producers are distributing products with various technologies and providing them to general consumers. As the level of awareness of products and technologies of general consumers gradually improves, it is common for general consumers to consider the quality and function of a specific product before consuming it. However, products produced and distributed in large quantities are always threatened by the distribution of fake products, which is fatal to both producers and general consumers. In particular, in the case of products that can affect health while being distributed in large quantities, such as cosmetics, food, and medical products, the distribution of fake products is emerging as a social problem.

Under this background, interest in various anti-counterfeiting technologies, which are mainly used in fields requiring high security such as the financial sector, is pouring out in all industrial fields. In general, holograms and QR codes among genuine product authentication technologies are low in technical difficulty and easy to copy, and technologies such as NFC, RFID, and dot-code are highly Due to the unit cost, it is generally difficult to apply it to the cosmetic or food field, so a new technology with advantages in both technical difficulty and unit cost is continuously required in the technical field to which the present invention belongs.

In general, the difficulty of technology increases when the differentiation of materials is strengthened. The differentiation of materials is distinguished between cases in which the material itself is new and cases in which the material can be applied are excellent in applicability, and in the case of excellent applicability, it is less dependent on the characteristics of the product group to which the technology using the material is applied. It is evaluated as a key factor in mass production. In particular, in the field of forgery prevention technology, it is well known that printability is an important factor evaluated as the applicability of materials used.

In order to be evaluated as a material with excellent printability, it must have an ink form that can be easily printed on general paper or film and used in anti-counterfeiting technology. Fluorescence ink, phosphorescent ink ( phosphorescene ink, thermochromic ink, photochromic ink, optical variable ink, magnetic ink, liquid crystal, and the like are widely used.

Liquid crystal is a representative material to which the principle of polarized light is applied, and is a technology used to measure various optical characteristics and identify materials in various technical fields as well as daily life, such as sunglasses or liquid crystal display screens. As the arrangement of the liquid crystal molecules is changed, the rotation of the polarization plane becomes incomplete, thereby blocking some of the light passing through the polarizing plate. It is known that the principle of polarization is applied.

Liquid crystal is a substance that has both liquid and solid properties. At low temperatures, it is a crystal with solid properties. It is a material mainly used in

Cholesteric liquid crystal is a liquid crystal in which molecules in each layer are twisted at a certain angle to form a spiral structure. In LCD panels, which are mainly used in portable electronic devices, etc., a polarizing film is attached to the surface of two glass substrates, and liquid crystal molecules are oriented in the direction of each polarization axis so as to be orthogonal to the polarization axis. Referring to FIG. 1, when the liquid crystal is twisted along the polarization axis, the vibration direction of light rotates according to the direction in which the liquid crystal molecules are aligned, and when a constant voltage is applied, the twist structure of the liquid crystal is destroyed so that the light cannot be rotated. , light does not pass through it and a black and white image is displayed. That is, it can be used as a detector that can confirm authenticity by printing a hidden mark that cannot be confirmed with the naked eye in a normal state by adjusting the alignment of the arranged liquid crystals, and is limitedly exposed to the outside when a special light is irradiated.

Cholesteric liquid crystal is a liquid crystal to which a dopant is added to induce a periodic spiral structure in a general nematic liquid crystal, and the director of the nematic liquid crystal has a spiral structure that forms layers while twisting along the spiral axis. can be formed according to When the helical axes of the cholesteric liquid crystal are vertically aligned with respect to the substrate surface, a planar structure is endowed with a unique property of selectively reflecting light according to the twisted direction of the spiral and the pitch of the repeating structure. . That is, if the light incident on the cholesteric liquid crystal is expressed as the sum of circularly polarized light having rotational directions opposite to each other, among the incident light, the circularly polarized light of the twisted direction, such as the helical structure of the cholesteric liquid crystal, is reflected and reflected. Circularly polarized light in the direction is transmitted. When an anti-counterfeiting pattern using cholesteric liquid crystal is disclosed using the properties of such cholesteric liquid crystal and a polarizing effect is applied to the fixed liquid crystal structure of a mobile phone, a hidden mark that cannot be confirmed from the outside under normal circumstances is observed with the naked eye. It can be.

In Patent Application No. 10-2016-7009110, a polarizing material is applied to a forgery prevention means, and a polarizer layer is applied to a part of a recording medium, and a transfer foil including a polarizer layer and an adhesive layer is adhered to counterfeiting formed on the recording medium. As a prevention medium, it is disclosed that an image is formed by laser engraving or heating using a thermal head, but there is a clear limitation in mass production sufficient to produce genuine certification labels.

Throughout this specification, a number of papers and patent documents are referenced and citations are indicated. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety, so that common technical knowledge in the technical field to which the present invention belongs and the content of the present invention are more clearly described.

The inventors of the present invention diligently studied to develop a forgery prevention means that is very difficult to forgery, easy to manufacture, inexpensive to manufacture, and capable of detecting forgery even without a separate forgery checking device.

As a result, the forgery prevention means including the base material, the printed layer on top of the base material, the cholesteric liquid crystal display layer on top of the printed layer, and the optical structure layer on the top of the cholesteric liquid crystal display layer polarized light emitted from the forgery checking means In light of this, it was found that forgery and alteration is very difficult, manufacturing is simple, and the production cost is low, and forgery detection is possible even without a separate forgery checking device.

In addition, when the inventors of the present invention irradiate light generated from an external light source to the forgery and alteration prevention means, the light source is located above the forgery and alteration prevention means, and an organ for recognizing light, for example, the observer's eyes, is located above the light source. In this case, since the organ does not recognize the light obscured by the light source, the light source is disposed at an angle so as to form an angle greater than 0 degrees with the virtual straight line formed by the anti-counterfeiting means and the organ to irradiate light, In this case, in order to solve the technical problem that the anti-counterfeiting means has insufficient visibility in performing the function of preventing forgery and alteration, intensive research was conducted.

As a result, when the forgery prevention means includes an optical structure layer including a scattering layer, even when light is irradiated by positioning the light source at an angle as described above, the forgery prevention means has much better visibility and forgery detection The present invention was completed by finding that the hidden mark for the purpose can be more quickly and easily identified.

In addition, the inventors of the present invention, when the anti-counterfeiting means including the cholesteric liquid crystal display layer includes optical structure layers including scattering layers on upper and lower sides of the cholesteric liquid crystal display layer, further improved With visibility, it was found that the hidden mark for forgery discrimination can be identified more quickly and easily.

That is, an object of the present invention is to provide a forgery prevention means including an optical structure layer including a cholesteric liquid crystal display layer and a scattering layer.

In addition, another object of the present invention is to provide a forgery identification method using a forgery prevention means including an optical structure layer including a cholesteric liquid crystal display layer and a scattering layer.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

The present invention provides a forgery prevention means.

According to one aspect of the present invention, the present invention provides a substrate; a printed layer located on the upper side of the substrate and having a specific pattern printed thereon; a cholesteric liquid crystal display layer located above the printed layer and printed with a hidden pattern; and a first optical structure layer disposed on the cholesteric liquid crystal display layer.

According to one aspect of the present invention, the present invention provides a substrate; a printed layer located on the upper side of the substrate and having a specific pattern printed thereon; a first optical structural layer positioned over the printed layer; and a cholesteric liquid crystal display layer disposed on the first optical structure layer and having a hidden pattern printed thereon.

According to one aspect of the present invention, the present invention provides a substrate; a printed layer located on the upper side of the substrate and having a specific pattern printed thereon; a first optical structural layer positioned over the printed layer; a cholesteric liquid crystal display layer on top of the first optical structure layer and printed with a hidden pattern; and a second optical structure layer positioned on the cholesteric liquid crystal display layer.

According to one aspect of the present invention, the optical structure layer is an optical structure layer including a scattering layer and a protective layer, and provides forgery prevention means.

The term 'cholesteric liquid crystal' used herein may refer to a liquid crystal in which each layer of molecules arranged in a planar shape rotates in a spiral shape. When polarized light is irradiated on a material containing 'cholesteric liquid crystal', a specific color, shape, or change in color and shape can be detected compared to a state in which polarized light is not irradiated.

As used herein, the term 'QR code' may refer to a two-dimensional (matrix) type code containing various information in various combinations of printed patterns composed of circular or rectangular dots of various shapes.

The term 'forgery' used in this specification may refer to any act of creating a new object that does not exist for the purpose of use by an unauthorized person, or any act of applying changes to an existing object without authorization.

According to one preferred aspect of the present invention, the cholesteric liquid crystal display layer of the present invention preferably includes a first cholesteric liquid crystal display layer and a second cholesteric liquid crystal display layer, wherein the first cholesteric liquid crystal display layer At least one of the LIC liquid crystal display layer and the second cholesteric liquid crystal display layer may be printed with an ink containing cholesteric liquid crystal.

According to a preferred aspect of the present invention, the first cholesteric liquid crystal display layer and the second cholesteric liquid crystal display layer of the present invention may be printed in the same color.

According to a preferred aspect of the present invention, the first cholesteric liquid crystal display layer and the second cholesteric liquid crystal display layer of the present invention may each be printed with an ink containing cholesteric liquid crystal, and each The cholesteric liquid crystals may have different orientations.

According to one preferred aspect of the present invention, the first cholesteric liquid crystal display layer of the present invention can be printed with a first ink containing cholesteric liquid crystal, and the printed second cholesteric liquid crystal display layer is It may be printed with a second ink containing cholesteric liquid crystals, and the cholesteric liquid crystals included in the first ink may have a different orientation from the cholesteric liquid crystals included in the second ink.

According to a preferred aspect of the present invention, 0.1 to 100 μm, preferably 0.5 to 50 μm, more preferably 1 to 30 μm, still more preferably 1 to 15 μm of the cholesteric liquid crystal display layer of the present invention can be

According to a preferred aspect of the present invention, the cholesteric liquid crystal display layer of the present invention may preferably be mixed with a complementary fluorescent dye, nematic liquid crystal or liquid crystal polymer.

In the present invention, it is very important that the cholesteric liquid crystal is mixed with a complementary fluorescent dye, nematic liquid crystal or liquid crystal polymer. Because, when complementary fluorescent dyes are added to cholesteric liquid crystals, the color seen with the naked eye and the color after authentication can be made different, and by adjusting the polarization alignment angle by mixing nematic liquid crystals or liquid crystal polymers with cholesteric liquid crystals This is because the color can be changed after authentication.

According to a preferred aspect of the present invention, the optical structure layer of the present invention may include a scattering layer, and preferably, the optical structure layer may include a scattering layer and a protective layer.

According to a preferred aspect of the present invention, the scattering layer of the present invention scatters light incident on one side of the scattering layer to make a luminance distribution of light emitted on the other side of the scattering layer even. Accordingly, when the light incident to one side of the scattering layer has a relatively small amount of light or has a relatively concentrated luminance distribution, the light emitted to the other side of the scattering layer is relatively even even though it has a relatively small amount of light. It may have a luminance distribution.

In the present invention, it is very important that the light emitted to the other surface of the scattering layer has a relatively even luminance distribution. Because, since the forgery and alteration prevention system including the forgery and alteration prevention means according to the present invention uses the screen of the forgery and alteration checking means as a light source, a light source having a relatively concentrated luminance distribution and having a smaller amount of light than a device for dimming is used. , This is because it is difficult to visually determine forgery or alteration through the forgery prevention means unless the observer's eye is located in a specific position.

That is, the anti-counterfeiting means according to the present invention includes an optical structure layer including a scattering layer, so that the hidden mark formed by the anti-counterfeiting means is displayed at the position of the observer despite using a screen such as a forgery checking means as a light source. can be observed without being bound by

Specifically, the standard deviation of the luminance distribution of light incident to the upper surface of the scattering layer may be smaller than the standard deviation of the luminance distribution of light emitted to the lower surface of the scattering layer.

According to a preferred aspect of the present invention, the scattering layer of the present invention may be a scattering layer in which triangular prisms are repeatedly formed on one side of the scattering layer, and the angle formed by the two sides forming the triangular prism is selected to solve the technical problem for which the present invention is aimed.

In the present invention, it is very important that triangular prisms are repeatedly formed on one side of the scattering layer. Because the triangular prism can scatter the light emitted from one side of the scattering layer in a direction perpendicular to the plane of the substrate while passing the light incident to the other side of the scattering layer. Even when the light collecting device or light sensing organ located on the upper side of the substrate is obliquely positioned to have a certain angle with respect to the direction perpendicular to the plane of the substrate, a sufficient amount of light incident perpendicular to the device or organ is secured This is because a much clearer hidden mark can be provided to the device or organ through this, and a forgery prevention function can be provided much more quickly and clearly.

According to one aspect of the present invention, the triangular prism formed on one side of the scattering layer may be formed differently depending on the aspect to be implemented. Specifically, the height and width of each triangular prism formed on one side of the scattering layer are 10 μm or less, 1000 nm (1 μm) or less, or 500 nm or less. As the height and width of the triangular prism decrease, the degree of scattering or diffusion of light is improved and visibility can be improved, so the height and width of the triangular prism are preferably the same as above.

According to one preferred aspect of the present invention, the scattering layer of the present invention may be included in an optical structure layer, wherein the optical structure layer is a first optical structure layer including a first scattering layer, and is a first optical structure layer of the cholesteric liquid crystal display layer. It can be located on the upper side. In this case, the triangular prisms may be repeatedly formed on the upper surface of the first scattering layer, and the light emitted from the upper surface of the cholesteric liquid crystal display layer is transmitted to the lower surface of the first scattering layer. When the incident light is then emitted to the upper surface of the first scattering layer, the light emitted to the upper surface of the first scattering layer is scattered or diffused, and the observer's eyes are not located in a direction perpendicular to the substrate. Even in the forgery and alteration prevention means according to the present invention provides a degree of visibility that can clearly and quickly determine whether forgery or alteration. At this time, the scattering layer may be formed of a known synthetic resin, preferably a translucent or transparent synthetic resin, for example, a cellulose-based resin, an acrylic resin, or polyester. According to a preferred aspect of the present invention, the optical structure layer is a second optical structure layer including a second scattering layer and is positioned below the cholesteric liquid crystal display layer. can do. In this case, the triangular prisms may be repeatedly formed on the lower surface of the second scattering layer, and the light incident on the upper surface of the second scattering layer is emitted to the lower surface of the second scattering layer. In this case, it is scattered or diffused and is configured to have a distribution in more diverse directions when reflected on the printed layer or substrate, and accordingly, even when the observer's eyes are not located in the direction perpendicular to the substrate, forgery prevention according to the present invention Visibility is provided to the extent that it is possible to clearly and quickly determine whether forgery or alteration has been made through means.

According to a preferred aspect of the present invention, the protective layer of the present invention may serve to protect triangular prisms repeatedly formed on one side of the scattering layer, and preferably, the lower portion of the protective layer When light is incident on the surface, the light emitted through the passivation layer is further diffused to provide a clearer hidden mark to the concentrator or the light sensing organ.

According to a preferred aspect of the present invention, an optical structure layer may be positioned on top of the cholesteric liquid crystal display layer of the present invention, and an adhesive layer is additionally positioned between the cholesteric liquid crystal display layer and the optical structure layer. can do.

According to a preferred aspect of the present invention, a stretched film layer may be positioned on top of the cholesteric liquid crystal display layer of the present invention, and an adhesive layer is further positioned between the cholesteric liquid crystal display layer and the stretched film layer can do.

The stretched film layer refers to a film having a characteristic in which intermolecular bonds constituting the film are substantially maintained when uniaxially or biaxially stretched.

The stretched film layer may be composed of a stretched film, that is, a uniaxially stretched film capable of longitudinal or transverse stretching, or a biaxially stretched film capable of longitudinal and transverse stretching. When the stretched film is stretched, as bonds between molecules constituting the stretched film are maintained, physical properties of the stretched film may not change and may have a stretched section that is not broken or ruptured. Preferably, the stretched film constituting the stretched film layer according to the present invention may be a stretched film having an elongation of 60% to 180%, more preferably a stretched film having an elongation of 80% to 120%, , The stretched film may be a stretched film made of a synthetic polymer material including polypropylene and polyethylene.

According to a preferred aspect of the present invention, an optical structure layer may be positioned on the cholesteric liquid crystal display layer of the present invention, and an adhesive layer is further provided between the cholesteric liquid crystal display layer and the optical structure layer. A stretched film layer may be additionally positioned on top of the optical structure layer, and an adhesive layer may be additionally positioned between the optical structure layer and the stretched film layer.

According to a preferred aspect of the present invention, a stretched film layer may be positioned on top of the cholesteric liquid crystal display layer of the present invention, and an adhesive layer may be positioned between the cholesteric liquid crystal display layer and the stretched film layer. An optical structural layer may be positioned on top of the stretched film layer, and an adhesive layer may be additionally positioned between the stretched film layer and the optical structural layer.

According to a preferred aspect of the present invention, a first optical structure layer may be positioned on the cholesteric liquid crystal display layer of the present invention, and an adhesive layer between the cholesteric liquid crystal display layer and the first optical structure layer This may be additionally positioned, a stretched film layer may be positioned on top of the optical structure layer, an adhesive layer may be additionally positioned between the first optical structure layer and the stretched film layer, and the stretched film layer A second optical structure layer may be positioned on top of, and an adhesive layer may be additionally positioned between the stretched film layer and the second optical structure layer.

According to a preferred aspect of the present invention, the substrate, the printing layer, the cholesteric liquid crystal display layer, the adhesive layer, the optical structure layer, the protective layer, and the stretched film layer may be formed of a known synthetic resin. have.

According to another aspect of the present invention, the present invention is a forgery and alteration prevention medium containing a polarizing material, a specific pattern capable of determining whether forgery or alteration is printed on the forgery prevention medium, and the forgery or alteration can be irradiated with polarized light. Provides a forgery and alteration prevention means including a polarizing material for checking the forgery and alteration prevention means by irradiating the forgery and alteration prevention medium, or using a polarizing film.

According to a preferred aspect of the present invention, the anti-counterfeiting medium of the present invention may preferably be a label, sticker, packaging material or paint.

According to a preferred aspect of the present invention, the specific shape capable of determining whether the forgery or falsification of the present invention may be, for example, a barcode or QR code, and another example is a pattern having meaning (see FIG. 6), source indication, trademark (trademark) or mark (Remark) may be used. Also, a kind of character or logo may be expressed.

In the present invention, it is a very important configuration that the most desirable specific shape capable of determining whether the forgery or alteration is the QR code. This is because, when a specific shape is a QR code, it is possible to easily convert a screen such as a forgery checking means to a dedicated screen capable of identifying forgery and alteration, and also to check whether the first forgery or alteration is detected by QR code recognition itself.

According to a preferred aspect of the present invention, a separate identification pattern that can be identified by polarized light generated from a light emitting means such as a forgery checking means or a screen may be printed on the specific shape of the present invention.

In the present invention, it is a very important configuration that a separate identification pattern that can be identified by polarized light generated on a screen such as forgery and alteration confirmation means is printed on the specific shape. This is because, when a separate identification shape that can be identified by polarized light generated on a screen such as a forgery checking means is printed on a specific shape, a means for checking whether forgery or alteration can be provided separately from the QR code.

According to a preferred aspect of the present invention, the forgery checking means of the present invention may be preferably a forgery checking means selected from the group comprising a smartphone, a tablet PC, a monitor and an LCD TV, and more preferably a smart It may be a phone or a tablet PC, and most preferably a smart phone.

According to a preferred aspect of the present invention, the forgery checking means of the present invention preferably uses a screen portion of the forgery checking means selected from the group including the smartphone, tablet PC, monitor, and LCD TV to prevent the forgery and alteration It may be confirmed by irradiating the medium with light generated from the screen portion.

In the present invention, it is a very important configuration to irradiate polarized light generated from the screen portion to the forgery prevention medium using a flash or screen portion, which is a light emitting means of a smartphone, which is a forgery confirmation means. Because, in the process of passing through or reflecting the polarized light generated from the light emitting means or the screen portion of the forgery and alteration detection means, the color and/or shape of the identification pattern is changed so that the identification pattern can be visually recognized. because it makes it identifiable.

According to a preferred aspect of the present invention, the polarized light generated from the screen portion of the forgery and alteration checking means is irradiated to the forgery and alteration prevention means according to the present invention, and as the light is irradiated to the forgery and alteration prevention means, the eyes of the observer The identification pattern can be identified.

A first imaginary line formed by the forgery and alteration preventing means with the forgery and alteration checking means, more specifically, the screen of the light emitting means of the forgery and alteration checking means, and a virtual second line formed by the forgery and alteration preventing means and the eye of the observer are irradiation angles. can form When the forgery checking means irradiates light to the forgery prevention means according to the present invention, the irradiation angle may be determined in the range of 0 to 90 degrees.

When the irradiation angle is 0 degree to an acute angle of less than 30 degrees, the identification shape is at least partially covered by the forgery and alteration confirmation means and is not identified by the observer's eyes, is not substantially identified, is vaguely identified, or It may be inaccurately identified as a part of it being covered by the forgery confirmation means. Therefore, the irradiation angle is preferably in the range of more than 0 degrees and less than 90 degrees, more preferably in the range of more than 0 degrees and less than 45 degrees, and more preferably in the range of more than 0 degrees and less than 30 degrees.

In another aspect of the present invention, the present invention provides forgery prevention means according to the present invention; Forgery confirmation means, more specifically, forgery confirmation means including a light emitting means; and an observer's eyes, wherein when light is irradiated onto the forgery and alteration prevention means, the pattern printed on the printed layer can be identified by the observer's eyes, and the forgery and alteration prevention means When the light generated from the screen of the forgery checking unit is irradiated, a shape different from the printed shape may be additionally identified to the eyes of the observer.

When a virtual first line formed by the forgery and alteration preventing means and the forgery and alteration checking means and a virtual second line formed by the forgery and alteration preventing means and the observer's eyes form an angle greater than 0 and less than 45 degrees, the observer's A shape different from the printed shape to the eye can be visually discerned.

According to a preferred aspect of the present invention, the anti-counterfeiting medium containing the polarizing material of the present invention is preferably printed using an ink that has the same color or looks the same at first glance, but either ink is a cholesteric liquid crystal ink , and another ink may include a printed layer printed using a cholesteric liquid crystal ink in a direction different from that of the cholesteric liquid crystal ink.

According to a preferred aspect of the present invention, the specific shape of the present invention is preferably a QR code shape, and the QR code is recognized using the forgery checking means, for example, an electronic device such as a smartphone or a tablet PC It may be to convert the screen portion of the forgery checking means into a dedicated screen capable of checking the printed layer using the polarizing material.

The features and advantages of the present invention are summarized as follows:

(a) the present invention describes; a printed layer located on the upper side of the substrate and having a specific pattern printed thereon; a cholesteric liquid crystal display layer located above the printed layer and printed with a hidden pattern; and an optical structure layer including a scattering layer disposed above the printed layer.

(b) In the present invention, incident light is uniformly scattered by the scattering layer included in the optical structure layer and condensed by the scattering layer through the inclusion of the optical structure layer, which greatly improves visibility and enables rapid detection of forgery and alteration. A forgery prevention means is provided.

(c) When the forgery prevention means of the present invention is checked for forgery by illuminating the light of the forgery confirmation means screen or the light of the light emitting means, forgery is very difficult, manufacturing is simple, the production cost is low, as well as a separate It provides the advantage of being able to detect forgery and alteration without having a forgery and alteration checking device.

(d) The anti-counterfeiting means of the present invention provides an advantage in that the luminance distribution of light is more uniform through the optical structure layer, thereby improving visibility and discrimination of the pattern of the printed layer.

Hereinafter, drawings for explaining the present invention in more detail will be briefly described. The drawings shown and referred to in the specification of the present invention have the purpose of clearly explaining various aspects of the present invention, and are in no way intended to limit the scope of the present invention to one aspect of the invention represented by the drawings, and the scale is may be exaggerated.
1 shows the structure of cholesteric liquid crystal ink and liquid crystal.
Figure 2a shows a cross-section of one aspect of the forgery prevention means of the present invention.
Figure 2b shows a cross-section of one aspect of the forgery prevention means of the present invention.
Figure 3 shows a cross-section of one aspect of the forgery prevention means of the present invention.
Figure 4 shows a cross section of one aspect of the forgery prevention means of the present invention.
Figure 5 shows a cross section of one aspect of the forgery prevention means of the present invention.
6 shows a state in which forgery or alteration is checked using a mobile phone screen.
7 shows a QR code for preventing forgery and alteration in which an identification pattern (“NBST”) manufactured using ink containing a polarizing material is printed in the middle of the QR code.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents or substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

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

2 to 5 show cross-sections of anti-counterfeiting means including a cholesteric liquid crystal display layer according to an embodiment of the present invention.

Referring to FIG. 2A , the anti-counterfeiting means 100 including a cholesteric liquid crystal display layer according to an embodiment of the present invention includes a substrate 110, a printed layer 120, and a first cholesteric liquid crystal display layer. (131) and a cholesteric liquid crystal display layer 130 including a second cholesteric liquid crystal display layer 132, an adhesive layer 140 and an optical structure layer 150.

The substrate 110 is located on the lowermost layer of the anti-counterfeiting means 100 including the cholesteric liquid crystal display layer, and various thin films used to manufacture labels and the like in the technical field to which the present invention belongs, such as synthetic resin, paper, and metal. this can be used

The printed layer 120 is located on top of the substrate 110, and a pattern distinct from that of the cholesteric liquid crystal display layer 130 described later is printed.

The cholesteric liquid crystal display layer 130 is positioned on the printed layer 120 and includes a first cholesteric liquid crystal display layer 131 and a second cholesteric liquid crystal display layer 132 .

The first cholesteric liquid crystal display layer 131 and the second cholesteric liquid crystal display layer 132 are printed using an ink containing cholesteric liquid crystal only in one of the cholesteric liquid crystal display layers. And, another cholesteric liquid crystal display layer is the embodiment printed using general ink that does not contain cholesteric liquid crystal, and the first cholesteric liquid crystal display layer 131 and the second cholesteric liquid crystal display layer 131. There is an embodiment in which all of the liquid crystal display layer 132 is printed using an ink containing cholesteric liquid crystal.

In the case of an embodiment in which both the first cholesteric liquid crystal display layer 131 and the second cholesteric liquid crystal display layer 132 are printed using ink containing cholesteric liquid crystal, each cholesteric liquid crystal display The alignment of the cholesteric liquid crystals used in the layer must be different so that a hidden mark can be identified to determine whether it is forged or altered.

The ink containing the cholesteric liquid crystal used in the printing of the cholesteric liquid crystal display layer 130 and the general ink not containing the cholesteric liquid crystal are both the same color or an ink that appears to be the same color at a glance. It should be.

The adhesive layer 140 may be positioned on top of the cholesteric liquid crystal display layer 130 , and the optical structure layer 150 may be positioned on top of the adhesive layer 140 .

The optical structure layer 150 is positioned on top of the adhesive layer 140 , and the optical structure layer 150 includes a scattering layer 151 and a protective layer 152 .

The scattering layer 151 is positioned above the adhesive layer 140 , and the protective layer 152 is positioned above the scattering layer 151 .

The scattering layer 151 may scatter light incident on the lower surface of the scattering layer 151 to even out the luminance distribution of the light emitted on the upper surface of the scattering layer 151 .

Specifically, the standard deviation of the luminance distribution of light incident to the upper surface of the first scattering layer may be smaller than the standard deviation of the luminance distribution of light emitted to the lower surface of the first scattering layer.

In addition, the standard deviation of the luminance distribution of light emitted from the upper surface of the second scattering layer may be greater than the standard deviation of the luminance distribution of light incident from the lower surface of the second scattering layer.

Triangular prisms are repeatedly formed on the top surface of the scattering layer 151 . The angle ("α") formed by the two sides forming the triangular prism may be 10 to 170 degrees, preferably 30 to 150 degrees, more preferably 45 to 120 degrees, More preferably, it may be 60 to 105 degrees, and most preferably, it may be 85 to 95 degrees.

Triangular prisms formed on the scattering layer 151 and the passivation layer 152 may be formed at the same angle as each other. Accordingly, the wide angle of light passing through the prism and scattered can be adjusted.

Referring to FIG. 2B , the adhesive layer 140 may be positioned on top of the printing layer 120, and the optical structure layer 150 may be positioned on top of the adhesive layer.

The optical structure layer 150 is positioned on top of the adhesive layer 140 , and the optical structure layer 150 includes a scattering layer 151 and a protective layer 152 .

The scattering layer 151 is positioned above the adhesive layer 140 , and the protective layer 152 is positioned above the scattering layer 151 .

The scattering layer 151 may scatter the light incident on the upper surface of the scattering layer 151 to even out the luminance distribution of the light emitted on the lower surface of the scattering layer 151 . Triangular prisms are repeatedly formed on the lower surface of the scattering layer 151 . The angle ("α") formed by the two sides forming the triangular prism may be 10 to 170 degrees, preferably 30 to 150 degrees, more preferably 45 to 120 degrees, More preferably, it may be 60 to 105 degrees, and most preferably, it may be 85 to 95 degrees.

Referring to FIG. 3, in the anti-counterfeiting means 100 including the cholesteric liquid crystal display layer according to an embodiment of the present invention, the stretched film layer 160 is selectively positioned on top of the optical structure layer 150. can do. When the stretched film layer 160 is positioned on top of the optical structure layer 150, the adhesive layer 140b may be positioned between the optical structure layer 150 and the stretched film layer 160.

When the stretched film layer 160 is positioned on top of the optical structure layer 150, the refractive index of light refracted by the cholesteric liquid crystal ink is controlled to increase the discrimination of hidden marks.

Referring to FIG. 4 , in the anti-counterfeiting means 100 including the cholesteric liquid crystal display layer according to an embodiment of the present invention, the stretched film layer 160 is selectively positioned under the optical structure layer 150. can do. When the stretched film layer 160 is positioned under the optical structure layer 150, the adhesive layer 140b may be positioned between the optical structure layer 150 and the stretched film layer 160.

When the stretched film layer 160 is positioned on top of the cholesteric liquid crystal display layer 130, the light refracted by the cholesteric liquid crystal ink can be further refracted to form a clearer hidden mark. discernment is increased.

Referring to FIG. 5 , the anti-counterfeiting means 100 including a cholesteric liquid crystal display layer according to an embodiment of the present invention includes a first optical structure layer 150a and a second optical structure layer 150b. can do. In this case, the second optical structure layer 150b may be positioned on the printed layer 120, and the cholesteric liquid crystal display layer 130 may be positioned on the second optical structure layer 150b. The first optical structure layer 150a may be positioned on top of the cholesteric liquid crystal display layer 130 .

In this case, an adhesive layer 140a may be positioned between the first optical structure layer 150a and the cholesteric liquid crystal display layer 130, and the cholesteric liquid crystal display layer 130 and the second An adhesive layer 140b may be positioned in the middle of the optical structure layer 150b.

In this case, when light generated from the light emitting means or the screen of the forgery checking means is incident on the second optical structure layer 150b, the light is incident on the upper surface of the second scattering layer 151b, and the second It is emitted to the lower surface of the scattering layer 151b.

In this case, the second scattering layer 151b scatters the light incident on the upper surface of the second scattering layer 151b to even out the luminance distribution of the light emitted on the lower surface of the second scattering layer 151b. can Triangular prisms are repeatedly formed on the lower surface of the second scattering layer 151b. The angle ("α") formed by the two sides forming the triangular prism may be 10 to 170 degrees, preferably 30 to 150 degrees, more preferably 45 to 120 degrees, More preferably, it may be 60 to 105 degrees, and most preferably, it may be 85 to 95 degrees.

In this case, when light emitted from the upper surface of the cholesteric liquid crystal display layer 130 is incident on the first optical structure layer 150a, the light is emitted to the lower surface of the first scattering layer 151a. It is incident and emitted to the upper surface of the first scattering layer 151a.

In this case, the first scattering layer 151a scatters the light incident on the lower surface of the first scattering layer 151a to even out the luminance distribution of the light emitted on the upper surface of the first scattering layer 151a. can Triangular prisms are repeatedly formed on the upper surface of the first scattering layer 151a. The angle ("α") formed by the two sides forming the triangular prism may be 10 to 170 degrees, preferably 30 to 150 degrees, more preferably 45 to 120 degrees, More preferably, it may be 60 to 105 degrees, and most preferably, it may be 85 to 95 degrees.

6 and 7, a QR code for preventing forgery and alteration in which an identification pattern (“NBST”) manufactured using ink containing a polarizing material according to an embodiment of the present invention is printed in the middle of the QR code. can confirm.

The process of determining whether forgery or alteration using the forgery or alteration prevention means according to the present invention includes the steps of firstly identifying whether or not forgery or alteration by recognizing the QR code using a camera mounted on the forgery or alteration check means; And light generated from the light emitting means or the screen of the forgery checking means is radiated to the forgery prevention means at an angle in the range of 0 to 90 degrees to make a secondary judgment on whether or not the forgery is falsified by whether or not the identification pattern is the same or not. steps may be included.

The cholesteric liquid crystal display layer of the anti-counterfeiting means according to the present invention may be printed using inks having the same color or seemingly identical at a glance, and one ink may be printed using liquid crystal ink and the other ink may be printed using general ink. can

The cholesteric liquid crystal display layer of the forgery prevention means according to the present invention and one side of the cholesteric liquid crystal display layer can be printed using retardation ink in which retardation film powder is mixed with general printing ink, and the color is the same or It can be printed using inks that look the same at a glance, one ink can be printed using the phase difference ink, and the other ink can be printed using general ink.

The cholesteric liquid crystal display layer of the anti-counterfeiting means according to the present invention can be printed using inks having the same color or seemingly identical at first glance, one ink having a specific structure and the other ink having the specific structure. It can be printed using a liquid crystal ink having a structure different from a liquid crystal ink having a structure. The liquid crystal ink having the specific structure may be a cholesteric liquid crystal ink in which liquid crystals are oriented in a spiral direction, and the liquid crystal ink having the other structure may be a liquid crystal ink having the spiral direction. It may be a cholesteric liquid crystal ink, nematic liquid crystal, or liquid crystal polymer oriented in a direction opposite to the direction.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and the present invention is within the technical spirit of the present invention. It is clear that modification or improvement is possible by the person.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

10: QR code
20: identification shape
100: forgery prevention means
110: base
120: printing layer
130: cholesteric liquid crystal display layer
131: first cholesteric liquid crystal display layer
132: second cholesteric liquid crystal display layer
140: adhesive layer
150: optical structure layer
151: scattering layer
152: protective layer
160: stretched film layer

Claims (13)

write;
a printed layer located on the upper side of the substrate and having a first pattern printed thereon;
a cholesteric liquid crystal display layer positioned above the printed layer and having a second pattern printed thereon;
a first optical structure layer on top of the cholesteric liquid crystal display layer and including a first scattering layer; and
a second optical structure layer located above the printing layer and below the cholesteric liquid crystal display layer and including a second scattering layer;
The upper surface of the first scattering layer has a prism pattern in which triangular prisms are repeatedly extended and formed.
delete According to claim 1,
The second scattering layer is characterized in that triangular prisms are repeatedly formed on the upper surface,
The forgery and alteration prevention means, characterized in that the angle formed by the two sides of the inclined surfaces forming the triangular prism is 30 to 150 degrees.
According to claim 1,
A standard deviation of luminance distribution of light incident on the upper surface of the first scattering layer is smaller than a standard deviation of luminance distribution of light emitted on the lower surface of the first scattering layer.
According to claim 3,
A standard deviation of luminance distribution of light emitted from the upper surface of the second scattering layer is greater than a standard deviation of luminance distribution of light incident from the lower surface of the second scattering layer.
According to claim 4 or 5,
The first optical structure layer or the second optical structure layer further includes a protective layer, and when the protective layer is added, it is positioned in contact with one surface of the scattering layer.
According to claim 1,
The anti-counterfeiting means further comprises a stretched film layer, and the stretched film layer, when added, is positioned above the cholesteric liquid crystal display layer.
According to claim 1,
The cholesteric liquid crystal display layer includes a printed first cholesteric liquid crystal display layer and a printed second cholesteric liquid crystal display layer, the printed first cholesteric liquid crystal display layer and the printed second cholesteric liquid crystal display layer. At least one of the two cholesteric liquid crystal display layers is printed with an ink containing cholesteric liquid crystal.
According to claim 8,
The forgery and alteration prevention means, characterized in that the printed first cholesteric liquid crystal display layer and the printed second cholesteric liquid crystal display layer are printed in the same color.
According to claim 8 or 9,
The printed first cholesteric liquid crystal display layer is printed with a first ink containing cholesteric liquid crystal, and the printed second cholesteric liquid crystal display layer is printed with a second ink containing cholesteric liquid crystal. and the cholesteric liquid crystal contained in the first ink has a different orientation from that of the cholesteric liquid crystal contained in the second ink.
Forgery prevention means according to claim 1; Forgery and alteration checking means including a light emitting means for irradiating polarized light; and an anti-counterfeiting system consisting of an observer's eye.
According to claim 11,
When light is irradiated to the forgery and alteration preventing means, the first pattern printed on the printed layer is identified to the eyes of the observer, and the light generated from the light emitting means or screen of the forgery and alteration checking means is irradiated to the forgery and alteration preventing means In this case, the second shape expressed through the cholesteric liquid crystal display layer to the eye of the observer is additionally identified.
According to claim 11,
When a virtual first line formed by the forgery and alteration preventing means and the forgery and alteration checking means and a virtual second line formed by the forgery and alteration preventing means and the observer's eyes form an angle greater than 0 and less than 45 degrees, the observer's Characterized in that the second shape is visually identified to the eye, forgery prevention system.

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