CN220121018U - Identification element and identification object - Google Patents
Identification element and identification object Download PDFInfo
- Publication number
- CN220121018U CN220121018U CN202320949886.9U CN202320949886U CN220121018U CN 220121018 U CN220121018 U CN 220121018U CN 202320949886 U CN202320949886 U CN 202320949886U CN 220121018 U CN220121018 U CN 220121018U
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- identification
- region
- color
- identification element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims description 72
- 230000003287 optical effect Effects 0.000 claims description 35
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 18
- 229920006254 polymer film Polymers 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 8
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims description 8
- 238000003475 lamination Methods 0.000 claims description 8
- 239000003086 colorant Substances 0.000 abstract description 26
- 239000004973 liquid crystal related substance Substances 0.000 description 50
- 239000000976 ink Substances 0.000 description 32
- 239000011248 coating agent Substances 0.000 description 24
- 238000000576 coating method Methods 0.000 description 24
- 230000010287 polarization Effects 0.000 description 24
- 238000000034 method Methods 0.000 description 20
- 239000000049 pigment Substances 0.000 description 20
- 238000002360 preparation method Methods 0.000 description 20
- 239000005020 polyethylene terephthalate Substances 0.000 description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 description 10
- 238000001035 drying Methods 0.000 description 9
- 239000004743 Polypropylene Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 7
- 229910052753 mercury Inorganic materials 0.000 description 7
- 238000004132 cross linking Methods 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000004988 Nematic liquid crystal Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- UHKJHMOIRYZSTH-UHFFFAOYSA-N ethyl 2-ethoxypropanoate Chemical compound CCOC(C)C(=O)OCC UHKJHMOIRYZSTH-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Polarising Elements (AREA)
Abstract
The present utility model relates to the field of identification media, and more particularly to an identification element and an identification object. An identification element comprising a first area 1 and a second area 2 randomly distributed. The phase difference layer is arranged, the identification dimension is increased, and the identification element which has multiple colors under a single identification window and can be switched along with the rotation of the identification window is provided; the phase difference layer is arranged, so that the identification difficulty is reduced, and an identification element which has multiple colors only through the irradiation of a mobile phone screen and can be switched in color when the mobile phone screen rotates is provided; the patterned phase difference layer is added, so that the safety of the identification element is further improved, and the identification element which can be identified only by irradiation of a mobile phone screen and is formed by multiple color combinations and is patterned is provided, and when the mobile phone screen rotates, the colors and the patterns can be switched.
Description
Technical Field
The present utility model relates to the field of identification media, in particular to G02B5/32, more particularly to an identification element and an identification object.
Background
Japanese patent laid-open publication No. 2003-73600 discloses that a print layer is provided in an anti-counterfeit print using an ink containing either or both of a right-handed polarizing pigment that reflects a part of right-handed circularly polarized light in incident light and a left-handed polarizing pigment that reflects a part of left-handed circularly polarized light in incident light. The authenticity of the counterfeit printed matter is visually judged by using the authenticity judging filter of the circular polarizer, so that the authenticity can be judged by a simple device. Currently, there are commercially available pigments of both left-and right-handed polarization, which are mixed and then made into an ink, and printed on a target object to form a counterfeit product. Japanese patent laid-open No. 11-42875 discloses a technique: the identification medium on which two layers of cholesteric liquid crystals are superimposed is visually inspected through liquid crystal filters having the same properties, and the authenticity is identified by changing the color according to the respective corresponding liquid crystal filters. However, the liquid crystal simple determiner, which is the same as that of the cholesteric liquid crystal used, needs to be used, and its versatility is low.
Patent CN100416312C discloses a two-layer medium in which left-handed cholesteric liquid crystals are stacked on top of each other, wherein cholesteric liquid crystal layers having different directions of rotation have different reflection colors, the colors cannot be recognized by the naked eye, and the identification medium of the target object is visually recognized by a simple determiner having an optical filter through which only light of right-handed circular polarization passes and an optical filter through which only light of left-handed circular polarization passes, and the colors of the right-handed circular polarization polymer cholesteric liquid crystal layers are visible on the right-handed circular polarization optical filter side and the colors of the left-handed circular polarization polymer cholesteric liquid crystal layers are visible on the left-handed circular polarization optical filter side, whereby the authenticity of the target object is recognized. The utility model has the following defects, and the optical effect and the safety are weakened: first, in a single identifier window, only one color can be observed; secondly, the color displayed in the recognizer window is constant; thirdly, the identifier is not readily available, which limits the convenience and popularity of the identification.
Disclosure of Invention
In view of the problems existing in the prior art, a first aspect of the present utility model provides an identification element, as shown in fig. 1, including a first area 1 and a second area 2 which are randomly distributed, wherein the first area includes n layers of left-handed cholesteric liquid crystal reflective layers 1L and n layers of right-handed cholesteric liquid crystal reflective layers 1R stacked on each other, and a color difference Δe between stacked colors 1L-R of the left-handed cholesteric liquid crystal reflective layers 1L and stacked colors 1R-G of the right-handed cholesteric liquid crystal reflective layers 1R is greater than or equal to 6.5; the second region comprises n layers of left-handed cholesteric liquid crystal reflecting layers 2L and n layers of right-handed cholesteric liquid crystal reflecting layers 2R which are mutually overlapped, the color difference value delta E between the lamination color 2L-G of the left-handed cholesteric liquid crystal reflecting layers (2L) of the second region and the lamination color 1R-G of the right-handed cholesteric liquid crystal reflecting layers (1R) of the first region is less than or equal to 6.5, and the color difference value delta E between the lamination color 2R-R of the right-handed cholesteric liquid crystal reflecting layers (2R) of the second region and the lamination color 1L-R of the left-handed cholesteric liquid crystal reflecting layers (1L) of the first region is less than or equal to 6.5; n is more than or equal to 1.
The color difference delta E is used for quantitatively describing the difference of two colors, and the larger the value of delta E is, the larger the color difference is, and the expression of delta E is as follows: Δe= [ (Δl:) 2 +(Δa*) 2 +(Δb*) 2 ] 1/2 。
Δl=l samples-L standard (brightness/black-white difference), also referred to as brightness difference.
Δa=a sample-a standard (red/green difference), also referred to as chromaticity difference.
Δb=b test article-b standard (yellow/blue difference), also referred to as chromaticity difference.
Preferably, the color difference value ΔE between the lamination color 1L of the left-handed cholesteric liquid crystal reflection layer 1L and the lamination color 1R of the right-handed cholesteric liquid crystal reflection layer 1R in each region is not less than 13, more preferably, the color difference value ΔE is not less than 25.
In the first region of the present utility model, the left-handed cholesteric liquid crystal reflective layer 1L and the right-handed cholesteric liquid crystal reflective layer 1R are superimposed in such a manner that the reflected light colors are a mixture 1C of the respective reflected light colors, conforming to the rule of addition. For example, the color of the reflected light after the red left-handed liquid crystal layer is superimposed with the green right-handed liquid crystal layer is yellow. From an identification perspective, the human eye cannot tell, without means, which specific colors the stack of colors is mixed from. However, the additive color can be reduced by means of the circular polarizer, i.e. only the color 1L-R of the left-handed liquid crystal layer can be observed through the left-handed circular polarizer, and only the color 1R-G of the right-handed liquid crystal layer can be observed through the right-handed circular polarizer. In view of this, in order to enable easier recognition by the observer with the aid of the tool, the color contrast of the left-handed liquid crystal layer and the right-handed liquid crystal layer should be as great as possible. The inventors found that when the color difference ΔE of the left-handed liquid crystal layer color 1L-R and the right-handed liquid crystal layer color 1R-G is not less than 6.5, a slightly noticeable color difference can be distinguished, when ΔE is not less than 13, a more noticeable color difference can be distinguished, and when ΔE is not less than 25, a very noticeable color difference can be distinguished.
Preferably, the color difference value delta E between the color 2L of the second region left-handed cholesteric liquid crystal reflecting layer (2L) and the color 1R of the first region right-handed cholesteric liquid crystal reflecting layer (1R) is less than or equal to 6.5, preferably, the color difference value delta E is less than or equal to 3.2, and more preferably, delta E is less than or equal to 1.6.
The inventors have unexpectedly found that in the present utility model, the color difference value ΔE between the color 2L of the second region left-handed cholesteric liquid crystal reflective layer (2L) and the color 1R of the first region right-handed cholesteric liquid crystal reflective layer (1R) is not more than 6.5, and the color difference value ΔE between the color 2R of the second region right-handed cholesteric liquid crystal reflective layer (2R) and the color 1L of the first region left-handed cholesteric liquid crystal reflective layer (1L) is not more than 6.5, so that the second region has a smaller color difference from the first region without the aid of a recognition tool, so that the difference between the two regions cannot be distinguished by an observer, and the second region always exhibits a significant color difference from the first region with the aid of the recognition tool.
Preferably, the color difference value delta E of the light reflected by the cholesteric liquid crystal reflecting layer in the first area and the cholesteric liquid crystal reflecting layer in the second area is less than or equal to 6.5, preferably, the color difference value delta E is less than or equal to 3.2, and more preferably, delta E is less than or equal to 1.6. The inventors have unexpectedly found that when the cholesteric liquid crystal reflective layer disposed in the second region is the same as the cholesteric liquid crystal reflective layer disposed in the first region, the best contrast recognition effect of circularly polarized light can be obtained under the condition that the colors of the reflected light are the same.
In one embodiment, as shown in fig. 2, the first region and/or the second region of the identification element further comprises a phase difference layer 3, which is located on the outer layer, i.e. the viewing side, of the identification element.
In the present utility model, the retardation layer is located in all or part of the first region and the second region, that is, the area of the retardation layer is equal to or smaller than the areas of the first region and the second region.
Preferably, the retardation of the retardation layer 3 is 50 to 250nm, preferably 60 to 230nm.
The addition of the phase difference layer 3 in the utility model can change the polarization state of the light reflected by the cholesteric liquid crystal reflecting layer, and the inventor surprisingly found that the phase delay of the phase difference layer 3 is controlled within the scope of the utility model, can maximally convert the left and right circular polarized light reflected by the left and right cholesteric liquid crystal reflecting layer into approximate linear polarized light respectively, and the polarization direction is approximately vertical.
The material of the retardation layer 3 in the present utility model is not particularly limited, and those skilled in the art can make routine selections, and in one embodiment, the material of the retardation layer 3 is a high molecular polymer film and/or a liquid crystal polymer film.
Examples of the polymer film include polypropylene (PP), polyurethane (PU), thermoplastic Polyurethane (TPU), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyvinyl alcohol (PVA), polycarbonate (PC), triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), polyimide (PI), and the like, and are preferably selected from polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), and more Preferably Polypropylene (PP).
When the material of the retardation layer 3 in the present utility model is a high molecular polymer film, the retardation caused by the polymer film is derived from unidirectional or bidirectional stretching in the production and manufacturing process, and the retardation of the polymer film can meet the above constraint conditions under a proper stretching ratio and a proper thickness, and the specific stretching ratio and thickness can be obtained by a person skilled in the art according to the prior art or a limited number of experiments.
When the identification element according to the present utility model includes the phase difference layer 3 and the phase difference layer 3 is a polymer film, the preparation method of the identification element can be selected by those skilled in the art conventionally, for example, the first region ink and the second region ink may be directly printed on the polymer film, that is, the polymer film serves as both the phase difference layer to adjust the polarization state of the cholesteric liquid crystal reflected light and as a printing substrate of the cholesteric liquid crystal ink to form the identification object having the identification element. In this case, the recognition object has double-sided recognition, i.e. the recognition element is observed through the substrate surface and the recognition element is directly observed with different optical characteristics, which further increases the security of the recognition element.
In another embodiment, the material of the retardation layer 3 is a liquid crystal polymer film, and the preparation method of the liquid crystal polymer film can be selected conventionally by those skilled in the art. For example, nematic liquid crystals are formed by photoalignment, or are obtained by the method described in patent US 20080291389.
In one embodiment, the material of the retardation layer 3 is a laminated high molecular polymer film and liquid crystal polymer film.
The phase difference layer changes the identification mode of the identification element, namely, the identification dimension is increased, namely, the phase difference layer is changed from the single-color abrupt switching to the gradual switching. For example, the change in color of the identification element can be observed by a single piece of linear polarizer, by horizontal rotation. Specifically, under the action of the phase difference layer, the left-hand polarized light 1L-R and the right-hand polarized light 1R-G in the first region of the identification element in FIG. 2 are respectively converted into linear polarized light 1L3-R and 1R3-G with nearly vertical polarization directions, and the left-hand polarized light 2L-G and the right-hand polarized light 2R-R in the second region are respectively converted into linear polarized light 2L3-G and 2R3-R with nearly vertical polarization directions. It can be seen that 1L3-R and 2L3-G have the same linear polarization direction, 1R3-G and 2R3-R have the same linear polarization direction, and the two sets of linear polarization directions are nearly perpendicular. At this time, when the polarization direction of the linear polarizer is parallel to 1L3-R and 2L3-G, only 1L3-R and 2L3-G are transmitted, and the observed colors are R color (first area) and G color (second area) with obvious contrast; at this time, the linear polarizer was rotated to 90 °, only 1R3-G and 2R3-R were transmitted, and the colors observed at this time were G (first region) and R (second region) with a distinct contrast; and the saturation of the color is gradually changed during the rotation, that is, the G color gradually appears after the R color gradually disappears as the linear polarizer rotates.
The phase difference layer increases the identification dimension, so that the identification element has multiple colors under a single identification window, and the colors can be switched along with the rotation of the identification window.
Preferably, as shown in fig. 3, the retardation layer 3 includes a first optical axis region 31 and a second optical axis region 32, and the first optical axis region 31 and the second optical axis region 32 are horizontally arranged and are in close contact with each other.
Further preferably, the optical axis angle between the first optical axis region 31 and the second optical axis region 32 is 90 ° ± 15 °. When the included angle between the two is within the scope of the utility model, the phase difference layer is a patterned phase difference layer.
In the utility model, the first optical axis area 31 and the second optical axis area 32 are arranged, the included angle of the optical axes is 90 degrees plus or minus 15 degrees, and circular polarized light can be converted into linear polarized light with the polarization direction approximately vertical, and the color of the light is not changed. The patterned phase difference layer further improves the security level, i.e. more complex security features can be observed through the linear polarizer or the cell phone screen. Specifically, taking the drawings as an example: when the included angle between the linear polarized light emitted by the mobile phone screen and the optical axis of the patterned phase difference layer is-45 degrees, the linear polarized light is converted into orthogonal circular polarized light, namely left-handed circularly polarized light and right-handed circularly polarized light, and the orthogonal circular polarized light continues to downwards spread. The left-hand circularly polarized light can be reflected by the left-hand liquid crystal layer in the identification element back to human eyes through the right-hand liquid crystal layer, and the color of the left-hand liquid crystal layer can be observed. That is, in the first region, the R color of the left-handed liquid crystal layer can be observed, and in the second region, the G color of the left-handed liquid crystal layer can be observed. And when the mobile phone screen is rotated until the included angle between the mobile phone linear polarization direction and the optical axis of the phase difference layer is 45 degrees, the patterned color is switched, and the G color of the right-handed liquid crystal layer in the first area and the R color of the right-handed liquid crystal layer in the second area can be observed. In the rotation process of the mobile phone, the saturation of the color is gradually changed, namely, along with the rotation of the linear polaroid, the invisible pattern gradually disappears from the R/G pattern to the G/R pattern.
In a second aspect the utility model provides a recognition object comprising said recognition element.
The identification element according to the utility model is present in the ink in the form of a pigment, which is attached to the identification object by printing.
Preferably, the identification object comprises a first area ink layer and a second area ink layer, wherein the first area ink layer comprises a first area in the identification element, and the second area ink layer comprises a second area in the identification element.
The method for preparing the identification element into the pigment in the present utility model is not particularly limited, and those skilled in the art can make routine selections. For example the method mentioned in patent US5942030 a. In one embodiment, a method of preparing a identification element into a pigment includes: 1) Applying a first polymerizable cholesteric liquid crystal to a substrate surface; 2) Aligning the liquid crystal; 3) Polymerizing the liquid crystal; 4) Repeating the steps 1-3 to finish the manufacture of the second cholesteric liquid crystal layer; 5) Optionally, repeating the steps 1-3 to finish the preparation of more cholesteric liquid crystal layers; 6) The polymer film is separated from the substrate surface and crushed to form pigment particles, completing the preparation of the cholesteric liquid crystal pigment for the first region. Based on the above method, the preparation of the cholesteric liquid crystal pigment for the second region is completed.
In addition, the method for preparing the ink of the present utility model is not particularly limited, and those skilled in the art can make routine selections. Such as the method mentioned in patent US9840632B2, etc. In the preparation process, the first region-used cholesteric liquid crystal pigment and the second region-used cholesteric liquid crystal pigment are respectively made into ink, and the first region ink and the second region ink are obtained.
The manner of attaching the ink printing to the recognition object in the present utility model is not particularly limited, and those skilled in the art may make routine selections such as screen printing, offset printing, gravure printing, letterpress printing, ink-jet printing, and the like.
In the present utility model, the color difference value ΔE of the first region ink layer and the second region ink layer is 6.5 or less, preferably 3.2 or less, and more preferably 1.6 or less.
In a third aspect, the present utility model provides a method for identifying an identification object using an LCD-type or OLED-type display device, for example, using a mobile phone screen for identification, lighting the mobile phone screen, irradiating an identification element from a phase difference layer side, turning the mobile phone, and observing a change in the appearance color of the identification element.
The phase difference layer is arranged, so that the identification difficulty is reduced, the identification can be realized by using an LCD (liquid crystal display) or OLED (organic light emitting diode) display device, and particularly, the identification can be realized by using a common mobile phone screen, so that the popularization difficulty of an identification tool is reduced. The light emitted by the screen is linearly polarized (a few screens emit light that is approximately linearly polarized). The linear polarized light irradiates the surface of the identification element and is firstly converted into circular polarized light or circular polarized light through the phase difference layerFor example, when the angle between the linear polarization direction of the mobile phone and the optical axis of the phase difference layer is-45 degrees, the linear polarization emitted by the mobile phone is converted into left-hand circular polarization and then continuously propagates downwards. The left-hand circularly polarized light can be reflected back to human eyes by the left-hand liquid crystal layer through the right-hand liquid crystal layer in the identification element, and the color of the reflected light is the same as that of the left-hand liquid crystal layer, so that the color of the reflected light of the left-hand liquid crystal can be observed. Specifically, in the first region, the color R of the left-handed liquid crystal layer is observed, and in the second region, the color G of the left-handed liquid crystal layer is observed. And when the mobile phone screen is rotated until the included angle between the linear polarization direction of the mobile phone and the optical axis of the phase difference layer is 45 degrees, the linear polarization emitted by the mobile phone is converted into right-handed circular polarization to be continuously transmitted downwards, and similarly, the G color of the first area and the R color of the second area are finally observed. And in the rotation process of the mobile phone, the saturation of the color is gradually changed, namely, the R color gradually disappears and the G color gradually appears or the R color gradually appears after the G color gradually disappears in the same area along with the rotation of the linear polaroid.
The utility model also provides a method for identifying the identification object by using the left-handed circular polarizer or right-handed circular polarizer identifier, which is characterized in that the left-handed circular polarizer or right-handed circular polarizer identifier is placed above the identification object, and the change of the apparent colors of different areas of the identification element in the identification object is observed through the identifier.
The utility model also provides a method for identifying the identification object by using the double window formed by the left-handed circular polaroid and the right-handed circular polaroid, in particular to a method for placing a double window identifier formed by the left-handed circular polaroid and the right-handed circular polaroid above the identification object and observing the change of the appearance color of an identification element in the identification object under different windows through the identifier.
Advantageous effects
The identification element of the utility model can realize multiple colors under a single identification window;
according to the utility model, the phase difference layer is arranged on the identification element, so that the identification dimension is increased, and the identification element which has multiple colors under a single identification window and can be switched in color along with the rotation of the identification window is provided;
according to the utility model, the phase difference layer is arranged on the identification element, so that the identification difficulty is reduced, and the identification element which has multiple colors only through the irradiation of the mobile phone screen and can be switched in color when the mobile phone screen rotates is provided;
the utility model adds the patterned phase difference layer on the identification element, further improves the safety of the identification element, and provides the identification element which can be identified only by the irradiation of the mobile phone screen, has multiple color combinations, is patterned, and can switch the colors and the patterns when the mobile phone screen rotates.
Drawings
FIG. 1 is a schematic view showing the structure of an identification element according to a first embodiment of the present utility model;
FIG. 2 is a schematic diagram of the structure of an identification element according to a first embodiment of the present utility model;
FIG. 3 is a schematic view of a structure of an identification element according to a third embodiment of the present utility model;
wherein 1-a first region; 2-a second region; 3-a phase difference layer; 31-a first optical axis region; 32-a second optical axis region; 1L-a first domain left-handed cholesteric liquid crystal reflective layer; 1R-a first domain dextrorotatory cholesteric liquid crystal reflective layer; 2R-a second domain dextrorotatory cholesteric liquid crystal reflective layer; 2L-second domain left-handed cholesteric liquid crystal reflective layer.
Detailed Description
Example 1
An identification element comprises a first area and a second area which are adjacent, wherein the first area comprises a left-handed cholesteric liquid crystal reflecting layer 1L and a right-handed cholesteric liquid crystal reflecting layer 1R which are mutually overlapped, and a color difference value delta E between the colors 1L-R of the left-handed cholesteric liquid crystal reflecting layer 1L and the colors 1R-G of the right-handed cholesteric liquid crystal reflecting layer 1R is more than or equal to 6.5; the second region comprises a left-handed cholesteric liquid crystal reflecting layer 2L and a right-handed cholesteric liquid crystal reflecting layer 2R which are mutually laminated, the color difference value delta E between the color 2L-G of the left-handed cholesteric liquid crystal reflecting layer 2L of the second region and the color 1R-G of the right-handed cholesteric liquid crystal reflecting layer 1R of the first region is less than or equal to 6.5, and the color difference value delta E between the laminated color 2R-R of the right-handed cholesteric liquid crystal reflecting layer 2R of the second region and the laminated color 1L-R of the left-handed cholesteric liquid crystal reflecting layer 1R of the first region is less than or equal to 6.5. The color difference delta E of the light reflected by the cholesteric liquid crystal reflecting layer in the first area and the cholesteric liquid crystal reflecting layer in the second area is less than or equal to 6.5.
An identification object comprising a first zone ink layer comprising a first zone in an identification element and a second zone ink layer comprising a second zone in the identification element.
The preparation method of the first region ink comprises the following steps:
(1) Preparation of first domain liquid crystal pigment:
coating a left-handed cholesteric liquid crystal coating liquid (red) on the surface of the PET substrate in an intaglio coating mode, wherein the wet coating amount is 10-12g/sqm; drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 0.6J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Continuously coating right-handed cholesteric liquid crystal coating liquid (green), wherein the wet coating amount is 10-12g/sqm; drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 1J/cm 2 . Peeling the liquid crystal film from the PET surface, grinding and crushing the liquid crystal film by using a grinder, and screening the liquid crystal film by a 400-mesh screen to obtain a liquid crystal pigment for a first area, wherein the average particle size of the liquid crystal pigment is 50 mu m;
(2) Preparation of first region liquid crystal ink:
the formula of the liquid crystal ink is as follows:
20% first domain liquid crystal pigment
20% of the UV resin, based on the total weight of the resin,BASF AG
25% of the UV resin, based on the total weight of the resin,BASF AG
10% UV reactive diluent, 1,6 hexanediol diacrylate (HDDA), sartomer company
5% initiator, TPO, BASF Co
15% solvent, ethyl ethoxypropionate, dow Corp
5% dispersant, polyacrylate-polyacrylic acid Block copolymer solution, pick Germany
Firstly dispersing the first area liquid crystal pigment in a dispersing agent, a solvent and a UV reactive diluent, and then adding the rest substances for fully mixing to obtain the first area liquid crystal ink.
The preparation method of the second region ink comprises the following steps:
(1) Preparation of second domain liquid crystal pigment:
coating a left-handed cholesteric liquid crystal coating liquid (green) on the surface of a PET substrate in an intaglio coating mode, wherein the wet coating amount is 10-12g/sqm; drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 0.6J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Continuously coating right-handed cholesteric liquid crystal coating liquid (red), wherein the wet coating amount is 10-12g/sqm; drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 1J/cm 2 . The liquid crystal film was peeled off from the PET surface, ground and pulverized by a grinder, and filtered through a 400-mesh screen to obtain a second domain liquid crystal pigment having an average particle diameter of about 50. Mu.m.
(2) Preparation of second region liquid crystal ink:
the formulation is the same as the first domain liquid crystal ink, except that the first domain liquid crystal pigment is replaced with the second domain liquid crystal pigment.
The preparation method is implemented in the same way as the preparation of the liquid crystal ink in the first area.
The preparation method of the identification object comprises the following steps:
the two liquid crystal inks are respectively printed by a screen printer with a overprinting function and an ultraviolet curing unit, the printing stock is black coated paper with the density of 120g/sqm, the printing pattern is a character of 30, wherein the pattern 3 is printed by the liquid crystal ink in a first area, and the pattern 0 is printed by the liquid crystal ink in a second area. The printed matter is quickly cured by ultraviolet after passing through a drying unit, and the dry film thickness is 15 micrometers. The ink has a readily observable liquid crystal flop effect after drying of the ink film.
Example 2
An identification element, in particular as in embodiment 1, differs in that both the first region and the second region comprise a phase difference layer 3, which is located on the outer layer, i.e. the viewing side, of the identification element.
The material of the phase difference layer 3 is a high molecular polymer film, and the specific preparation method is as follows: selecting Torarayfan TM As a retardation film, the 30 μm PP film of (E) was found to have a phase retardation of 75 to 87nm at different positions by Axocan test.
An identification object, in particular as in embodiment 1, differs in that the first and the second region in the identification element each comprise a phase difference layer 3, which is located on the outer layer of the identification element, i.e. the viewing side.
The method for producing the identification object is the same as in example 1, except that the PP film of the retardation layer is used as a printing material and directly printed on the surface thereof.
Example 3
An identification element, in particular, the same as in example 2, is different in that the material of the retardation layer 3 is a liquid crystal polymer film, and the preparation method of the liquid crystal polymer film is as follows: coating nematic liquid crystal coating liquid on the PET surface after flannelette friction, wherein the wet coating amount is 5g/sqm (the dry coating amount is 1.15 g/sqm); drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 0.6J/cm 2 . Measured by Axoscan, the phase delay is125nm。
The preparation method of the identified object is specifically the same as in example 2.
Example 4
An identification element, in particular, the difference from embodiment 2 is that the phase difference layer 3 includes a first optical axis region 31 and a second optical axis region 32, the first optical axis region 31 and the second optical axis region 32 are horizontally arranged and are in close contact with each other, an optical axis included angle between the first optical axis region 31 and the second optical axis region 32 is 89 °, at this time, the phase difference layer is a patterned phase difference layer, and the preparation method of the phase difference layer 3 is as follows:
coating a photo-alignment coating liquid on the surface of PET, wherein the wet coating amount is 5g/sqm; after drying and orientation at 80 ℃, carrying out graphic exposure under a linear polarized high-pressure mercury lamp, wherein the graph is formed by small five-pointed star, and the exposure energy is 0.1J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Subsequently, a nematic liquid crystal coating liquid was coated on the surface thereof in a wet coating amount of 5g/sqm (dry coating amount of 1.15 g/sqm); drying at 80deg.C, and crosslinking and curing under high pressure mercury lamp with curing energy of 0.6J/cm 2 . The nematic liquid crystal layer has a phase retardation of 125nm as measured by Axoscan. The optical axis included angle of different areas of the graphical phase difference is 89 degrees through the analysis of a polarizing microscope. The patterned retardation layer was subjected to composite transfer with the identification element obtained in example 1, and the identification element having a nematic liquid crystal retardation film was obtained after the transfer.
The preparation method of the identified object is specifically the same as in example 2.
The identification method comprises the following steps:
the identification element obtained in example 1 was identified using a double window circular polarizer. When observed with naked eyes, the 30 characters on the identification element are not obviously different; and placing a double-window identifier consisting of the left-handed circular polarizer and the right-handed circular polarizer above the identification element, and observing the change of the appearance color of the identification element under different windows through the identifier. The left window can observe the number 3 for red and the number 0 for green; the right window may observe a green number 3 and a red number 0.
Identification of the identification element obtained in examples 2 and 3 using linear polarizers. When observed with naked eyes, the 30 characters on the identification element are not obviously different; the single-chip linear polaroid identifier is placed above the identification element, the red number 3 and the green number 0 can be observed through the identifier, at the moment, the identifier is rotated, the numbers 3 and 0 are synchronously faded to disappear, then the identifier is continuously rotated, the number 3 is gradually changed into green, the number 0 is gradually changed into red, and the color is gradually enhanced. And continuing to rotate the identifier, and repeating the processes of color fading, switching and intensity turning.
Identification of the identification element obtained in examples 2 and 3 using a smart phone. When observed with naked eyes, the 30 characters on the identification element are not obviously different; the mobile phone screen is lightened to irradiate the identification element, the red number 3 and the green number 0 can be observed, at the moment, the mobile phone is rotated, the numbers 3 and 0 turn down to disappear synchronously, then the mobile phone is continuously rotated, the number 3 gradually turns green, the number 0 gradually turns red, and the color is gradually enhanced. And continuing to rotate the mobile phone, and repeating the processes of color fading, switching and intensity turning.
Identification of the identification element obtained in example 4 using a smart phone. When observed with naked eyes, the 30 characters on the identification element are not obviously different; the screen of the mobile phone is lightened to irradiate the identification element, and a green five-pointed star is observed in a red number 3, and meanwhile, a red five-pointed star is observed in a green number 0. Turning the mobile phone screen, changing the number 3 from red to green, and changing the five-pointed star from green to red; and the number 0 is reversed from green to red and five-pointed star from red to green.
Claims (10)
1. An identification element is characterized by comprising a first area (1) and a second area (2) which are randomly distributed, wherein the first area comprises n layers of left-handed cholesteric liquid crystal reflecting layers (1L) and n layers of right-handed cholesteric liquid crystal reflecting layers (1R) which are mutually overlapped, and a color difference value delta E between the lamination color 1L of the left-handed cholesteric liquid crystal reflecting layers (1L) and the lamination color 1R of the right-handed cholesteric liquid crystal reflecting layers (1R) is more than or equal to 6.5; the second region comprises n layers of left-handed cholesteric liquid crystal reflecting layers (2L) and n layers of right-handed cholesteric liquid crystal reflecting layers (2R) which are mutually overlapped, the color difference value delta E between the color 2L of the left-handed cholesteric liquid crystal reflecting layers (2L) of the second region and the color 1R of the right-handed cholesteric liquid crystal reflecting layers (1R) of the first region is less than or equal to 6.5, and the color difference value delta E between the color 2R of the right-handed cholesteric liquid crystal reflecting layers (2R) of the second region and the color 1L of the left-handed cholesteric liquid crystal reflecting layers (1L) of the first region is less than or equal to 6.5; n is more than or equal to 1.
2. The identification element of claim 1 wherein the first and second regional cholesteric liquid crystal reflective layers reflect a light color difference Δe of 6.5 or less.
3. The identification element according to claim 1 or 2, characterized in that the first area and/or the second area in the identification element further comprises a phase difference layer (3) present at least in a partial area, which is located in the outer layer of the identification element.
4. A recognition element according to claim 3, characterized in that the phase retardation of the phase difference layer (3) is 50-250nm.
5. The identification element according to claim 4, characterized in that the material of the phase difference layer (3) is a high molecular polymer film and/or a liquid crystal polymer film.
6. The identification element according to claim 5, characterized in that the material of the phase difference layer (3) is a laminated high molecular polymer film and liquid crystal polymer film.
7. A recognition element according to claim 3, characterized in that the phase difference layer (3) comprises a first optical axis region (31) and a second optical axis region (32).
8. The identification element according to claim 7, characterized in that the optical axis angle of the first optical axis region (31) and the second optical axis region (32) is 90 ° ± 15 °.
9. An identification object comprising an identification element as claimed in any of the claims 1-8, characterized in that the identification object comprises a first area ink layer and a second area ink layer.
10. The identification object of claim 9 wherein the first region of the ink layer comprises a first region of the identification element and the second region of the ink layer comprises a second region of the identification element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320949886.9U CN220121018U (en) | 2023-04-24 | 2023-04-24 | Identification element and identification object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320949886.9U CN220121018U (en) | 2023-04-24 | 2023-04-24 | Identification element and identification object |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220121018U true CN220121018U (en) | 2023-12-01 |
Family
ID=88913515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320949886.9U Active CN220121018U (en) | 2023-04-24 | 2023-04-24 | Identification element and identification object |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220121018U (en) |
-
2023
- 2023-04-24 CN CN202320949886.9U patent/CN220121018U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7728931B2 (en) | Security element and method for producing same | |
| KR101358542B1 (en) | Identification medium, identification method and identification device | |
| EP0720753B1 (en) | Coloured material | |
| US7667894B2 (en) | Security element and process for producing the same | |
| US8696031B2 (en) | Oriented image coating on transparent substrate | |
| CN102481723B (en) | The method for forming photon crystal material | |
| CN112368613B (en) | Identification medium, authenticity determination method, and article | |
| AU2011100315A4 (en) | Security element | |
| WO2011065242A1 (en) | Identification medium and identification method therefore | |
| WO2021065484A1 (en) | Display medium, display product, and display set | |
| MXPA01002160A (en) | Multilayer reflective film or pigment with viewing angle dependent reflection characteristics. | |
| WO2004102234A1 (en) | Object identification medium and identification method | |
| CN103676261B (en) | Optically variable anti-counterfeiting element and preparation method thereof, anti-fake product | |
| US20100112314A1 (en) | Invisible Pigments and Ink | |
| EP3392054B1 (en) | Method of manufacturing a polymeric valuable document substrate or security element | |
| CN107132607A (en) | Optical anti-counterfeiting film apparatus | |
| WO2020121791A1 (en) | Authenticity determining viewer and manufacturing method for same, method for determining authenticity of authentication medium, and authenticity determining set | |
| CN220121018U (en) | Identification element and identification object | |
| CN116500718A (en) | Identification element and identification object | |
| CN114207083A (en) | Composite pigment, identification medium and authenticity judgment method | |
| JP2021076792A (en) | Display medium, manufacturing method therefor, and ink | |
| JP5811568B2 (en) | Anti-counterfeit media | |
| CN116449477A (en) | Identification element, identification object comprising identification element and identification method | |
| US20220244595A1 (en) | Display medium, display product, and display set | |
| WO2019189144A1 (en) | Flakes, method for producing same, and paint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |