CN210534365U - Optical element with colorful invisible patterns - Google Patents
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- CN210534365U CN210534365U CN201921517961.4U CN201921517961U CN210534365U CN 210534365 U CN210534365 U CN 210534365U CN 201921517961 U CN201921517961 U CN 201921517961U CN 210534365 U CN210534365 U CN 210534365U
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Abstract
The utility model relates to an anti-fake technical field, specificly involve a colored stealthy pattern optical element. The color invisible pattern optical element at least comprises a nematic liquid crystal layer, a photosensitive orientation layer and a reflection layer, wherein the photosensitive orientation layer is arranged between the reflection layer and the nematic liquid crystal layer; the photosensitive alignment layer includes at least two regions having different pretilt angles of molecules with respect to the plane of the reflective layer. The utility model discloses in the direction orientation of the nematic phase liquid crystal molecule of different regions according to the photosensitive orientation molecule in its place region, different regions have different optical phase delay. When the optical element is observed through the polaroid, polarized light passes through different areas of the element to generate different optical delays, the wavelengths of reflected light are within the range of visible light, different colors appear in different areas of the element, and colorful images are presented, so that the perfect combination of anti-counterfeiting and art is realized.
Description
Technical Field
The utility model relates to anti-fake technical field, concretely relates to colored stealthy pattern optical element.
Background
The liquid crystal anti-counterfeiting technology is widely used, and liquid crystal can usually generate special optical effect to achieve the purpose of easy identification and difficult counterfeiting. In which, by using the optical anisotropy of the liquid crystal material, layers having a certain phase retardation can be formed, which are colorless and transparent to the naked eye, but can generate polarized light interference in the presence of a polarizer, and exhibit a certain color, i.e., the color can be expressed only under a specific condition, and thus the color can be considered invisible, and the specific color is determined by the phase retardation of the liquid crystal layer. Different phase retardations and colors can be produced by lamination of multiple layers of liquid crystals, but this method is complicated in process, requires the use of multiple layers of liquid crystals and multiple overlapping, and increases cost and manufacturing difficulty. Both patent CN101361026B and patent CN201680014134.6 propose an advanced, invisible color pattern realization method, which is to fill up the liquid crystal layer by providing grooves and/or microstructures with different depths of 0.05-1 μm on the substrate, so that the liquid crystal layer in different areas has different thicknesses (or called heights) and, correspondingly, different phase retardation sizes. Different amounts of phase retardation are indistinguishable to the naked eye, but when viewed using a polarizer, can produce invisible patterns that are distinguishable by different chromatic phases. However, the utility model has the following disadvantages: 1) the scale fall of the groove of the object substrate of the utility model inevitably generates boundaries visible to naked eyes, and the boundaries can lead the invisible patterns to be perceived and revealed before observation, thereby losing the hidden significance; 2) the boundaries of the grooves cause disorder of the alignment posture of the liquid crystal, and the invisible information is also visualized to some extent.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a color invisible pattern optical element using only a single liquid crystal layer and a method of manufacturing the same, and eliminates the situation in which an invisible pattern trace can be observed by the naked eye. The utility model provides a technical problem still in providing a valuable articles who is provided with above-mentioned optical element, through combining above-mentioned optics anti-fake element, can observe the colorful hidden image that optical element contains under the polaroid, provide the anti-fake element that has artistic expression for valuable articles.
Specifically, in order to solve the technical problem, the color invisible pattern optical element at least comprises a nematic liquid crystal layer, a photosensitive alignment layer and a reflecting layer, wherein the photosensitive alignment layer is arranged between the reflecting layer and the nematic liquid crystal layer; the photosensitive alignment layer includes at least two regions having different pretilt angles of molecules with respect to the plane of the reflective layer.
As a preferable technical scheme, the range of the pretilt angle of the molecules is-60 to 60 degrees.
As a preferable technical solution, the liquid crystal material molecular alignment direction of the nematic liquid crystal layer is the same as the photosensitive material molecular alignment direction of the photosensitive alignment layer.
As a preferable technical scheme, the thickness of the nematic liquid crystal layer is the same.
As a preferable technical scheme, the thickness of the nematic liquid crystal layer is 0.5-6 μm.
As a preferable technical scheme, the reflecting layer is a cholesteric liquid crystal layer or a substrate metal plating layer.
In a preferred embodiment, the metal coating layer in the metal coating layer of the substrate is selected from one of an aluminum coating layer, a copper coating layer and a silver coating layer.
As a preferable technical solution, the substrate in the substrate metal plating layer is selected from one of PP, PET, PC, TAC, COP, PMMA, PI, PA, POE, PP, PS, PU, PVA, PE, and PEN.
The utility model provides a colored stealthy pattern optical element carries out the setting of different pretilt angles through to the column phase liquid crystal layer, makes the column phase liquid crystal layer contain a plurality of regions that have different phase delay to interfere through the polarized light and produce different colours, create complicated color effect, and this kind of color effect bore hole can not observe, observes just can show through the polaroid, thereby plays fine anti-fake effect. Moreover, because the utility model discloses in do not use recess, step, microstructure etc. to have the region of obvious physics difference in height, consequently can not produce step boundary department reflection form difference, cause the unable stealthy defect of stealthy pattern. And simultaneously, the utility model discloses the thickness of each regional liquid crystal layer is the same, and is whole more even level and smooth, can not produce the disorderly condition of liquid crystal orientation. Furthermore, the utility model provides a colored invisible patterns optical element only adopts the show that the one deck liquid crystal layer can realize multiple color, simple structure, and the preparation is convenient, and is with low costs, when being applicable to the anti-fake among various high-grade artistic product etc., can make the product more pleasing to the eye, gives higher value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the optical element with color invisible patterns according to the present invention.
Fig. 2 is a diagram showing the anti-counterfeit effect of the optical element with color invisible patterns according to the present invention.
Wherein, the liquid crystal layer comprises 1-nematic phase, 2-photosensitive orientation layer, 3-reflection layer, 4-area I, 5-area II and 6-area III.
Detailed Description
The technical features of the technical solutions provided in the present invention will be described more clearly and completely with reference to the following detailed description, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In order to solve the above problems, the present invention provides a color invisible pattern optical element using only a single liquid crystal layer and a method of manufacturing the same, and eliminates the situation in which an invisible pattern trace can be observed by the naked eye. The utility model provides a technical problem still in providing a valuable articles who is provided with above-mentioned optical element, through combining above-mentioned optics anti-fake element, can observe the colorful hidden image that optical element contains under the polaroid, provide the anti-fake element that has artistic expression for valuable articles.
Specifically, in order to solve the technical problem, the color invisible pattern optical element at least comprises a nematic liquid crystal layer, a photosensitive alignment layer and a reflecting layer, wherein the photosensitive alignment layer is arranged between the reflecting layer and the nematic liquid crystal layer; the photosensitive alignment layer includes at least two regions having different pretilt angles of molecules with respect to the plane of the reflective layer.
When the anisotropic layer is arranged between the reflecting layer and the polaroid, incident natural light is polarized by the polaroid and converted into linearly polarized light, the linearly polarized light is further decomposed into ordinary light o light and extraordinary light e light when passing through the anisotropic layer, the o light and the e light are transmitted back to the polaroid after reaching the reflecting layer, and because the refractive indexes on the transmission route are different, the o light and the e light generate phase difference after passing through the anisotropic layer, and interference can be formed when the o light and the e light are emitted by the polaroid to generate color. The specific color is determined by the magnitude of the phase difference, and further, by the phase retardation of the optically anisotropic layer.
In some embodiments, the pretilt angle of the molecules is in the range of-60 to 60 degrees. Preferably, the liquid crystal material molecular orientation direction of the nematic liquid crystal layer is the same as the photosensitive material molecular orientation direction of the photosensitive orientation layer. The utility model discloses in photosensitive orientation material of pretilt is oriented and is formed along the direction of difference under the effect of polarized light. Specifically, the reaction of the photosensitive alignment molecules when irradiated by linearly polarized ultraviolet light is caused by the electric field of the incident polarized light, so that the photosensitive alignment molecules are aligned along the angle between the direction of the electric field and the plane of the photosensitive alignment layer, thereby forming a solid angle with respect to the plane of the substrate, which is the pretilt angle θ of the photosensitive alignment layer molecules.
The nematic liquid crystal molecules of the present invention are rod-like molecules having different refractive indices in the major axis direction and the minor axis direction, and the randomly mixed nematic liquid crystal molecules have refractive index differences that cancel each other out and macroscopically exhibit optical isotropy. However, when the liquid crystal molecules are oriented in a regular manner as a whole, the difference in refractive index can be macroscopically expressed to form optical anisotropy. The alignment of the nematic liquid crystal molecules requires an indirect method of inducing the alignment of the liquid crystal indirectly by aligning another substance (photosensitive alignment material).
The alignment direction of the liquid crystal material molecules of the nematic liquid crystal layer is the same as that of the photosensitive material molecules of the photosensitive alignment layer, so that the range of the pre-tilt angle of the molecules of the nematic liquid crystal layer is-60 degrees. Thus, the nematic liquid crystal layer also comprises at least two regions having different pretilt angles of the molecules with respect to the plane of the reflective layer. In the present application, the effective phase retardation of the nematic liquid crystal layer is the projection of its intrinsic phase retardation onto a plane due to the presence of different pretilt angles of different regions on the layer, i.e.: deltaθ＝δ0Cos θ, thereby forming at least two regions having different phase retardations. And the size of the phase retardation determines the color of the macroscopic polarized light after interference.
The applicant has found that when the incident direction of the linearly polarised uv light used for exposure is at an angle to the photosensitive alignment layer, the direction of the electric field of the incident linearly polarised light is perpendicular to the direction of the incident light and therefore also at an angle to the plane of the alignment layer. The reaction that occurs when the photosensitive alignment molecules are irradiated by linearly polarized ultraviolet light is caused by the electric field of the incident polarized light, and thus the photosensitive alignment molecules are aligned along the angle between the direction of the electric field and the plane of the photosensitive alignment layer, thereby forming a solid angle with respect to the plane of the substrate, which is the pretilt angle θ of the molecules of the photosensitive alignment layer. Therefore, the applicant can finally realize color control of the invisible pattern by controlling the exposure angle control of the photosensitive alignment layer. Obviously, when increasing the regional quantity that has different pretilt angles, the utility model discloses can realize the colored pattern in a plurality of regions, create more complicated color effect. The utility model discloses when the pretilt angle of well photosensitive orientation layer/nematic phase liquid crystal layer is too little, the phase delay of its production is not obvious, and the color anti-fake effect is not showing significantly, and too big inclination realizes that the degree of difficulty is big, and stability is relatively poor.
The photosensitive alignment layer and the nematic liquid crystal layer in the present invention are prepared by respectively preparing a photosensitive alignment material and a nematic liquid crystal material into a solution, and then coating the solution by a method known to those skilled in the art. The photosensitive alignment material and the nematic liquid crystal material can be purchased from the market and can be purchased from Shanghai Huan New Material science and technology company Limited.
In some embodiments, the thickness of each region of the nematic liquid crystal layer is the same, and since there is no region with obvious physical height difference on the liquid crystal layer, the defect that the invisible pattern cannot be invisible due to the difference of reflection form at the step boundary is not generated, and simultaneously, due to the same thickness of the liquid crystal layer, the patterned optical element is more uniform and smooth, and the condition of liquid crystal orientation disorder is not generated as in the prior art.
In some embodiments, the nematic liquid crystal layer has a thickness of 0.5 to 6 μm. Generally, after a nematic liquid crystal material solution is coated on a photosensitive alignment layer for about 6 μm, different direction information is written by linear polarized ultraviolet light with the wavelength of 280-340nm in an air atmosphere (namely, linear polarized ultraviolet light exposure with the angle of-60 degrees with the plane of a reflecting layer is used), and then the coating is cured by an ultraviolet mercury lamp in a nitrogen atmosphere to form a nematic liquid crystal layer with a first area and a second area which have different optical anisotropies. In the process, the liquid crystal material in the nematic liquid crystal layer is cured and shrunk, and the final thickness is in the range of 0.5-6 μm.
The utility model discloses in the effect of reflector layer is reflected light, makes the ordinary light and the reflection of extraordinary light through the reflector layer that are decomposed, produces the phase difference because of the different refracting indexes on the propagation route, can form and interfere, produces the colour. The material of the reflective layer of the present invention is not particularly limited, and any material known to those skilled in the art may be used.
In some embodiments, the reflective layer is a cholesteric liquid crystal layer or a substrate metal plating; preferably, the metal coating in the base metal coating is selected from one of an aluminum coating, a copper coating and a silver coating; further preferably, the substrate in the substrate metal plating layer is selected from one of PP, PET, PC, TAC, COP, PMMA, PI, PA, POE, PP, PS, PU, PVA, PE, and PEN.
The present invention will be described in detail with reference to the following examples. It is necessary to point out here that the following examples are only used for further illustration of the present invention, and should not be interpreted as limiting the scope of the present invention, and that the skilled person in this field can make some insubstantial modifications and adjustments according to the above-mentioned contents of the present invention, and still fall within the scope of the present invention.
Examples
Example 1: referring to fig. 1 and 2, embodiment 1 provides a color invisible pattern optical element comprising a nematic liquid crystal layer 1, a photosensitive alignment layer 2, and a reflective layer 3, the photosensitive alignment layer 2 being disposed between the reflective layer 3 and the nematic liquid crystal layer 1; the photosensitive alignment layer 2 comprises three regions having different pretilt angles of molecules with respect to the plane of the reflective layer 3. Wherein the reflective layer 3 is aluminized PET.
The colored invisible pattern optical element can be prepared by a method well known to those skilled in the art, such as:
coating a photosensitive orientation material on an aluminum surface gravure of aluminum-plated PET, and then exposing a region I by using linearly polarized ultraviolet light which forms 0 degree with the plane of a reflecting layer and has the wavelength of 310nm, wherein the region I is in a flower shape; then, linear polarization ultraviolet light (same as the above) forming an angle of 30 degrees with the plane of the reflecting layer is used for exposing the photosensitive orientation layer of the area II, and the shape of the area II is leaves; and then exposing the area III by using linearly polarized ultraviolet light which forms 50 degrees with the plane of the reflecting layer, wherein the shape of the area III is a background. After all the exposures were completed, a nematic liquid crystal material with a wet thickness of 6 μm was coated on the surface of the photosensitive alignment layer, and the nematic liquid crystal layer was cross-linked and cured with ultraviolet light.
Since the birefringence of the nematic liquid crystal molecules (pretilt angle of 30 degrees) in the obtained region ii was 0.866 times that of the region 1 (tilt angle of 0 degrees), and the birefringence of the nematic liquid crystal molecules (pretilt angle of 60 degrees) in the region iii was 0.5 times that of the region 1 (pretilt angle of 0 degrees), 3 regions had significant phase retardation differences, when the optical element was observed with a polarizing plate, the respective regions of the element exhibited different colors, the region 1 was a red flower, the region ii was a green leaf, and the region iii was a blue background. The image of the safflower versus green leaf on the whole of the element was observed through the polarizing plate. The optical element is used for anti-counterfeiting of high-grade commodities in a labeling mode.
Example 2: referring to fig. 1 and 2, embodiment 2 provides a color invisible pattern optical element comprising a nematic liquid crystal layer 1, a photosensitive alignment layer 2, and a reflective layer 3, the photosensitive alignment layer 2 being disposed between the reflective layer 3 and the nematic liquid crystal layer 1; the photosensitive alignment layer 2 includes at least three regions having different pretilt angles of molecules with respect to the plane of the reflective layer 3. Wherein the reflective layer 3 is a cholesteric liquid crystal layer.
The colored invisible pattern optical element can be prepared by a method well known to those skilled in the art, such as:
coating the cholesteric liquid crystal material on a PET (polyethylene terephthalate) substrate provided with release paper, coating a photosensitive orientation material on the cholesteric liquid crystal layer, and exposing a region I by using linear polarization ultraviolet light which forms 0 degree with the plane of the reflecting layer and has the wavelength of 310nm, wherein the region I is in a flower shape; then, linear polarization ultraviolet light (same as the above) forming an angle of 30 degrees with the plane of the reflecting layer is used for exposing the photosensitive orientation layer of the area II, and the shape of the area II is leaves; and then exposing the area III by using linearly polarized ultraviolet light which forms 50 degrees with the plane of the reflecting layer, wherein the shape of the area III is a background. After all the exposures were completed, a nematic liquid crystal material with a wet thickness of 6 μm was coated on the surface of the photosensitive alignment layer, and the nematic liquid crystal layer was cross-linked and cured with ultraviolet light.
Since the birefringence of the nematic liquid crystal molecules (pretilt angle of 30 degrees) in the obtained region ii was 0.866 times that of the region 1 (tilt angle of 0 degrees), and the birefringence of the nematic liquid crystal molecules (pretilt angle of 60 degrees) in the region iii was 0.5 times that of the region 1 (pretilt angle of 0 degrees), 3 regions had significant phase retardation differences, when the optical element was observed with a polarizing plate, the respective regions of the element exhibited different colors, the region 1 was a red flower, the region ii was a green leaf, and the region iii was a blue background. The image of the safflower versus green leaf on the whole of the element was observed through the polarizing plate. The optical element is used for anti-counterfeiting of high-grade commodities in a labeling mode.
The drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.
For purposes of clarity, the thickness of layers or regions in the figures used to describe embodiments of the present disclosure are exaggerated or reduced, i.e., the figures are not drawn on a true scale.
Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content disclosed above into equivalent embodiments with equivalent changes, but all those skilled in the art do not depart from the technical scope of the present invention, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (8)
1. A color invisible pattern optical element, characterized in that the color invisible pattern optical element comprises at least a nematic liquid crystal layer, a photosensitive alignment layer and a reflective layer, wherein the photosensitive alignment layer is arranged between the reflective layer and the nematic liquid crystal layer; the photosensitive alignment layer includes at least two regions having different pretilt angles of molecules with respect to the plane of the reflective layer.
2. The optical element according to claim 1, wherein the pretilt angle of the molecules is in the range of-60 to 60 degrees.
3. The optical element according to claim 1, wherein the nematic liquid crystal layer has a molecular alignment direction of the liquid crystal material which is the same as the photosensitive alignment layer.
4. The optical element according to claim 1, wherein the nematic liquid crystal layers have the same thickness.
5. The optical element according to claim 1, wherein the nematic liquid crystal layer has a thickness of 0.5 to 6 μm.
6. The optical element according to claim 1, wherein the reflective layer is a cholesteric liquid crystal layer or a substrate metal plating layer.
7. The optical element according to claim 6, wherein the metal plating layer of the base metal plating layer is one selected from the group consisting of an aluminum plating layer, a copper plating layer, and a silver plating layer.
8. The optical element with invisible patterns according to claim 7, wherein the substrate in the substrate metal plating layer is one selected from the group consisting of PP, PET, PC, TAC, COP, PMMA, PI, PA, POE, PP, PS, PU, PVA, PE, PEN.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285819A (en) * | 2020-11-03 | 2021-01-29 | 上海先幻新材料科技有限公司 | Polarizing film with different optical retardation areas, optical system and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285819A (en) * | 2020-11-03 | 2021-01-29 | 上海先幻新材料科技有限公司 | Polarizing film with different optical retardation areas, optical system and application |
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Effective date of registration: 20211112 Address after: 201400 Building 1, No.1 Haikun Road, Fengxian District, Shanghai Patentee after: Shanghai Xianren new materials partnership (L.P.) Address before: 201799 block B44, 4th floor, building 5, No. 2278, Zhaozhong Road, Chonggu Town, Qingpu District, Shanghai Patentee before: SHANGHAI XIANHUAN NEW MATERIAL TECHNOLOGY CO.,LTD. |
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Effective date of registration: 20230109 Address after: 201400 Building 1, No.1 Haikun Road, Fengxian District, Shanghai Patentee after: Shanghai Xianren new materials partnership (L.P.) Patentee after: Shanghai Xianhuan Hi Tech New Materials Co.,Ltd. Address before: 201400 Building 1, No.1 Haikun Road, Fengxian District, Shanghai Patentee before: Shanghai Xianren new materials partnership (L.P.) |
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