WO2021218100A1

WO2021218100A1 - Micromirror dynamic photochromic film

Info

Publication number: WO2021218100A1
Application number: PCT/CN2020/126841
Authority: WO
Inventors: 朱昊枢; 叶瑞; 孙营春; 左志成; 任家安; 陈林森; 朱志坚
Original assignee: 苏州苏大维格科技集团股份有限公司; 苏大维格(盐城)光电科技有限公司
Priority date: 2020-04-29
Filing date: 2020-11-05
Publication date: 2021-11-04
Also published as: CN211787903U

Abstract

Disclosed is a micromirror dynamic photochromic film, successively comprising a micro-lens array layer (12), a base film (11), an information layer (13), an upper medium layer (14), an intermediate medium layer (15) and a lower medium layer (16), wherein the information layer (13) is in contact with the upper medium layer (14), and the upper medium layer (14), the intermediate medium layer (15) and the lower medium layer (16) form a color-changing structure which presents a color change along with a change in viewing angle. The upper medium layer (14), the intermediate medium layer (15) and the lower medium layer (16) form the color-changing structure which presents a color change along with a change in viewing angle, such that the micromirror dynamic photochromic film has the dual anti-counterfeit effects of dynamic micro-pattern magnification change and color change when being turned.

Description

Dynamic optical variable film of micromirror

This application claims the priority of the Chinese patent application whose application date is April 29, 2020 and the application number is 202020695385.9, the entire content of which is incorporated into this application by reference.

Technical field

The utility model relates to the technical field of anti-counterfeiting, in particular to a dynamic optical variable film of a micromirror.

Background technique

In the modern commodity economy, the competition is fierce, and the lawbreakers are driven by profits to counterfeit securities, valuable bills, trademarks, logos and packaging of hot-selling commodities. With the development of science and technology, counterfeiters use modern high-tech means to penetrate into the anti-counterfeiting special printing industry. As far as the current anti-counterfeiting market in my country is concerned, the overall situation is that "the anti-counterfeiting technology product market is chaotic, low-performance anti-counterfeiting products compete at low prices, and high-tech and high-performance anti-counterfeiting products are in a difficult situation."

The existing dynamic security films are based on both sides of the substrate, with a micro lens layer on one side and a micro graphic layer on the other side. The product presents a dynamic graphic effect, and the color is a fixed color, without discoloration effect, and low anti-counterfeiting force.

The foregoing description is to provide general background information, and does not necessarily constitute prior art.

Utility model content

The purpose of the utility model is to provide a micro-mirror dynamic light-changing film with a color-changing effect.

The utility model provides a micro-mirror dynamic light variable film, which in turn includes a micro-lens array layer, a base film, an information layer with micro graphics, an upper medium layer, an intermediate medium layer, and a lower medium layer. When the upper dielectric layer is in contact, the upper dielectric layer, the middle dielectric layer, and the lower dielectric layer form a color-changing structure that changes color with the change of the viewing angle.

In one of the embodiments, the refractive index of the upper dielectric layer and the lower dielectric layer are both greater than the refractive index of the intermediate dielectric layer.

In one of the embodiments, the information layer is provided with at least one micro-image and text layer with micro-image and text information. When the micro-image and text layer has multiple layers, the micro-image and text of each layer are the same as those of the other layers. Correspondence staggered.

In one of the embodiments, the micro-graphic layer is provided with a micro-graphic groove, and the micro-graphic groove forms the micro-graphic information, or the micro-graphic groove is filled with ink , The ink follows the shape of the micro-graphic groove to form the micro-graphic information.

In one of the embodiments, the microlens array layer is provided with a plurality of microlenses of the same size, and the information layer is arranged near the focal plane of the microlenses.

In one of the embodiments, the thickness of the upper dielectric layer is smaller than that of the middle dielectric layer, and the thickness of the lower dielectric layer is smaller than that of the middle dielectric layer.

In one of the embodiments, the micromirror dynamic optical variable film further includes a color layer, the color layer is disposed on the side of the lower dielectric layer away from the intermediate dielectric layer, and the color layer is provided with at least one color area.

In one of the embodiments, the micro-lens dynamic optical variable film further includes a dielectric protective layer, a transparent protective layer, a pressure-sensitive adhesive layer, and a release paper layer, and the dielectric protective layer is disposed on the micro lens array layer away from the On one side of the base film, the transparent protective layer is disposed on the side of the medium protective layer away from the microlens array layer, and the pressure-sensitive adhesive layer is disposed on a side of the color layer away from the lower dielectric layer. Side, the release paper layer is arranged on the side of the pressure-sensitive adhesive layer away from the color layer.

The micromirror dynamic light-changing film provided by the utility model forms a color-changing structure that changes color with the change of the observation angle through the upper dielectric layer, the middle dielectric layer, and the lower dielectric layer, so that the micromirror dynamic light When the variable film rotates, it has the dual anti-counterfeiting effect of the dynamic zooming change of the micro-graphics and the color change, and the anti-counterfeiting force is extremely high.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of the micro-mirror dynamic light-changing film according to the first embodiment of the present invention;

2 is a schematic diagram of the structure of the micro-mirror dynamic light change film according to the second embodiment of the present invention;

Fig. 3 is a schematic diagram of the structure of the micro-mirror dynamic light-changing film according to the third embodiment of the present invention.

Detailed ways

The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

The first embodiment

Please refer to FIG. 1, the micro-mirror dynamic optical variable film provided in the first embodiment of the present invention includes a micro-lens array layer 12, a base film 11, an information layer 13, an upper dielectric layer 14, an intermediate dielectric layer 15, and a lower dielectric layer in sequence. Layer 16. The information layer 13 is in contact with the upper dielectric layer 14, and the upper dielectric layer 14, the middle dielectric layer 15 and the lower dielectric layer 16 form a color-changing structure that changes color with the change of the viewing angle.

The microlens array layer 12 is provided with a plurality of microlenses of uniform size in a lattice arrangement or randomly arranged, and a base film 11 is provided on the lower surface of the microlens array layer 12.

The transparency of the base film 11 is relatively high to ensure that the information layer 13 provided on the lower surface of the base film 11 can be clearly seen through the base film 11. Specifically, the base film 11 is PET (Polyethylene terephthalate, polyethylene terephthalate), and an information layer 13 is provided on the lower surface of the base film 11.

The information layer 13 is provided with a micro-graphic information layer with micro-graphic information. The micro-graphic layer is provided with a micro-graphic groove 50, and the micro-graphic groove 50 forms micro-graphic information.

Specifically, the micro graphic information in the micro graphic layer is set near the focal plane of the micro lens, and the moiré magnification effect is formed by the micro lens, so that the micro graphic information observed through the micro lens array layer 12 is three-dimensional and dynamic. Enlarge to increase the anti-counterfeiting effect.

A color-changing structure is provided on the lower surface of the information layer 13, and the color-changing structure is a multilayer thin film resonance structure. The structure is based on the principle of resonance to realize the expression of colors: standing wave resonance occurs when the incident wavelength changes at different observation angles to realize the color change, that is, the color changes as the observation angle changes.

The discoloration structure is specifically explained as follows.

The upper dielectric layer 14 and the lower dielectric layer 16 are prepared by a vacuum evaporation process or a vacuum sputtering process, and the intermediate dielectric layer 15 is prepared by a vacuum evaporation process or a vacuum sputtering process or a nano-coating method. Wherein, the upper dielectric layer 14 is prepared on the surface of the information layer 13 on the side with the micro-graphic information; the intermediate dielectric layer 15 is prepared on the lower surface of the upper dielectric layer 14; the lower dielectric layer 16 is prepared on the lower surface of the intermediate dielectric layer 15.

Specifically, the material of the upper dielectric layer 14 is a high refractive index medium, such as titanium dioxide and zinc sulfide, with a thickness of 10-80 nm; the material of the upper dielectric layer 14 may also be metal, with a thickness of 6-10 nm. The material of the intermediate dielectric layer 15 is a metal compound, such as magnesium fluoride, or metal or polymer, with a thickness of 150nm-2um; the material of the lower dielectric layer 16 is a high refractive index medium, such as titanium dioxide, zinc sulfide, and its thickness It is 10-80 nm; the material of the lower dielectric layer 16 can also be metal, and its thickness is 10-50 nm. The color expression is achieved by designing the upper dielectric layer 14, the middle dielectric layer 15 and the lower dielectric layer 16 with the materials of each layer or/and different thicknesses. As the thickness changes, the displayed color changes, and with the observation angle (incident The angle) changes, the color presented will also change.

In this embodiment, the material of the upper dielectric layer 14 is metallic chromium, which is prepared by a vacuum evaporation process, and its thickness is 8nm; the surfaces on both sides of the upper dielectric layer 14 follow the shape of the information layer 13 in contact with the upper dielectric layer 14. The surface with the micro graphic information side. The intermediate dielectric layer 15 is PMMA (Polymethyl methacrylat), which is prepared by nano-coating, and its thickness is 1 um; the upper surface of the intermediate dielectric layer 15 follows the shape of the information layer in contact with the upper dielectric layer 14 13 The surface on the side with the micro-graphic information, and the lower surface is flat. The material of the lower dielectric layer 16 is metallic aluminum, and the thickness is 30 nm. Among them, the upper dielectric layer 14, the middle dielectric layer 15 and the lower dielectric layer 16 form a slab waveguide resonance structure with a color changing function, and the structure is specifically a Fabry-Perot cavity.

In practical applications, the refractive index of the upper dielectric layer 14 and the refractive index of the lower dielectric layer 16 are both greater than the refractive index of the intermediate dielectric layer 15. Wherein, the refractive index of the intermediate dielectric layer 15 is 1.38-1.51.

When the observation angle changes, the position of the resonance spectrum shifts, and the color of the product changes. Therefore, the product of this embodiment has the dual anti-counterfeiting effects of dynamic zooming change of micro-graphics and color change when rotating, and the anti-counterfeiting force is extremely high.

Second embodiment

As shown in FIG. 2, the micro-mirror dynamic optical variable film provided by the second embodiment of the present invention sequentially includes a micro-lens array layer 22, a base film 21, an information layer 23, an upper dielectric layer 24, an intermediate dielectric layer 25, and a lower dielectric layer. 26. The information layer 23 is in contact with the upper dielectric layer 24, and the upper dielectric layer 24, the middle dielectric layer 25, and the lower dielectric layer 26 form a resonance structure that changes color with the change of the viewing angle. The difference between the micro-mirror dynamic light-changing film of this embodiment and the above-mentioned first embodiment is that the micro-mirror dynamic light-changing film further includes a color layer 27. The color layer 27 is arranged on the side of the lower dielectric layer 26 away from the intermediate dielectric layer 25.

The color of the color layer 27 is dark, such as black, deep purple, and deep blue; the thickness of the color layer 27 is 0.1 um to 20 um; preferably, the thickness of the color layer 27 is 1 um to 10 um. The material of the color layer 27 is nano-scale ink, and the color of the color layer 27 is black.

In this embodiment, each dielectric layer is prepared by a vacuum evaporation process. Therefore, the upper surface and the lower surface of each dielectric layer conform to the surface of the information layer 13 which is in contact with the upper dielectric layer 14 and has the micro-graphic information side. . Specifically, the material of the upper dielectric layer 24 is zinc sulfide, the refractive index is 2.4, and the thickness is 10 nm; the material of the intermediate dielectric layer 25 is magnesium fluoride, the refractive index is 1.38, and the thickness is 200 nm. The material of the lower dielectric layer 26 is titanium dioxide with a thickness of 30 nm.

The upper dielectric layer 24, the middle dielectric layer 25, and the lower dielectric layer 26 form a slab waveguide resonance structure. Together with the superposition of the color layer 27, the position of the resonance spectrum shifts, and the product exhibits complex color changes. When the observation angle changes, the resonance frequency will move, so that the colorful dynamic color-changing film of the present invention has a color-changing effect at the same time. Therefore, by superimposing the color layer 27 to absorb colors of different wavelengths, the wavelength of the final reflected light is changed instead of the color presented by the original resonance structure, thus achieving a strong (ie, darker color) and complex color change effect, thereby Enhance the sense of vision, and enhance the anti-counterfeiting effect. The product of this embodiment has the dual anti-counterfeiting effects of dynamic zooming changes of micro-graphics and complex color changes when rotating, and the anti-counterfeiting strength is extremely high.

The third embodiment

As shown in FIG. 3, the micro-mirror dynamic optical variable film provided by the third embodiment of the present invention includes a micro-lens array layer 32, a base film 31, an information layer 33, an upper dielectric layer 34, an intermediate dielectric layer 35, and a lower dielectric layer in sequence. 36. The information layer 33 is in contact with the upper dielectric layer 34, and the upper dielectric layer 34, the middle dielectric layer 35, and the lower dielectric layer 36 form a slab waveguide resonant structure that changes color as the viewing angle changes.

The difference between the micro-mirror dynamic light-changing film of this embodiment and the above-mentioned second embodiment is that the micro-mirror dynamic light-changing film further includes a dielectric protective layer 38, a transparent protective layer 39, a pressure-sensitive adhesive layer 310, and a release paper layer 311, and The information layer 33 is provided with two micro-graphic layers.

The dynamic light change film of the micromirror of this embodiment will be described in detail below.

The two micro-graphic layers are the first micro-graphic layer 331 and the second micro-graphic layer 332; the first micro-graphic layer 331 is located on the lower surface of the base film 31, and the second micro-graphic layer 332 is laid on the first micro-graphic layer 331. The lower surface of the micro graphic layer 331. The thickness of the first micro-graphic layer 331 and the second micro-graphic layer 332 is set corresponding to the focal length of the micro lens, and the micro-graphic information in the two micro-graphic layers is correspondingly staggered. Therefore, the micro-mirror dynamic optical variable film has a variety of anti-counterfeiting functions, thereby enhancing the anti-counterfeiting ability. The moiré magnification effect is formed by the micro lens, so that each micro graphic information forms a multi-layer dynamic three-dimensional anti-counterfeiting effect, thereby increasing the anti-counterfeiting effect. At the same time, the micro-graphic information of each micro-graphic layer observed through the micro-lens array layer 12 shows a partial or entire layout on the micro-mirror dynamic optically variable film.

Specifically, the ink 60 is scraped at the micro-graphic groove 50 of the first micro-graphic layer 331, and the ink 60 follows the shape of the micro-graphic groove 50 to form micro-graphic information, so that the micro-graphic information has colors and increases prominence. sex. The micro-graphic information of the second micro-graphic layer 332 is the micro-graphic groove 50.

In other embodiments, the information layer 33 is provided with at least three micrograph and text layers, and the micrograph and text information arrangement positions of the micrograph and text layers are staggered with each other. The micro-graphic information in each micro-graphic layer can be the same or different. The micro-graphic information of the same micro-graphic layer can be a single type, or multiple combinations, such as a combination of graphics, text and images, or a single Kind of.

The dielectric protection layer 38 is arranged on the side of the microlens array layer 32 away from the base film 31, the transparent protection layer 39 is arranged on the side of the dielectric protection layer 38 away from the microlens array layer 32, and the pressure-sensitive adhesive layer 310 is arranged on the color layer 37 away from the base film 31. On the side of the lower dielectric layer 36, the release paper layer 311 is disposed on the side of the pressure-sensitive adhesive layer 310 away from the color layer 37. A transparent protective layer 39 is provided outside the dielectric protective layer 38. The dielectric protective layer 38 protects the structure of the microlens array layer 32 from being damaged, and the transparent protective layer 39 meets the performance requirements of the product under the conditions of use.

When in use, the release paper layer 311 is peeled off, and the pressure-sensitive adhesive layer 310 is attached to the use substrate.

The product provided by this embodiment is convenient to use; it has the effect of dynamically zooming in on images and texts and the effect of changing colors, and the anti-counterfeiting degree is extremely high.

In the drawings, the sizes and relative sizes of layers and regions are exaggerated for clarity. It should be understood that when an element such as a layer, region, or substrate is referred to as being "formed on," "disposed on," or "on" another element, the element can be directly disposed on the other element, or There may be intermediate elements. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements.

In this article, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", The orientation or positional relationship indicated by "horizontal" is based on the orientation or positional relationship shown in the drawings, which is only for the clarity of the technical solution and the convenience of description, and therefore cannot be understood as a limitation of the present invention.

In this article, the sequential adjectives "first" and "second" used to describe elements are only used to distinguish elements with similar attributes, and do not mean that the elements described in this way must be in a given order, or time, space, or time. Level or other restrictions.

In this document, unless otherwise specified, "plurality" and "several" mean two or more than two.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

In this article, the terms "include", "include" or any other variants thereof are intended to encompass non-exclusive inclusion, in addition to including those elements listed, but also other elements not explicitly listed.

The above are only specific implementations of the present utility model, but the protection scope of the present utility model is not limited to this. Any person skilled in the art can easily think of changes or changes within the technical scope disclosed by the utility model. Replacement shall be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A micromirror dynamic optically variable film, which is characterized in that it comprises a microlens array layer, a base film, an information layer, an upper dielectric layer, an intermediate dielectric layer, and a lower dielectric layer in sequence, wherein the information layer is in contact with the upper dielectric layer, The upper dielectric layer, the intermediate dielectric layer, and the lower dielectric layer form a color-changing structure that changes in color as the viewing angle changes.
8. The micromirror dynamic optical variable film according to claim 1, wherein the refractive index of the upper dielectric layer and the lower dielectric layer are both greater than the refractive index of the intermediate dielectric layer.
The micro-mirror dynamic light-change film according to claim 1, wherein the information layer is provided with at least one micro-image-text layer with micro-image-text information, and when the micro-image-text layer has multiple layers, each The micro-pictures and texts of the layers are staggered correspondingly with the micro-pictures of the other layers.
The micro-mirror dynamic optical variable film of claim 3, wherein the micro-graphic layer is provided with a micro-graphic groove, and the micro-graphic groove forms the micro-graphic information, or, The micro graphic groove is filled with ink, and the ink follows the shape of the micro graphic groove to form the micro graphic information.
3. The dynamic optical variable film for micromirrors according to claim 1, wherein a plurality of microlenses of uniform size are arranged on the microlens array layer, and the information layer is arranged near the focal plane of the microlenses.
3. The micromirror dynamic optical variable film according to claim 1, wherein the thickness of the upper dielectric layer is smaller than that of the middle dielectric layer, and the thickness of the lower dielectric layer is smaller than that of the middle dielectric layer.
The micro-mirror dynamic light-change film according to claim 1, wherein the micro-mirror dynamic light-change film further comprises a color layer, and the color layer is disposed on a side of the lower dielectric layer away from the intermediate dielectric layer. , The color layer is provided with at least one color area.
8. The micro-mirror dynamic light-change film of claim 7, wherein the micro-mirror dynamic light-change film further comprises a dielectric protective layer, a transparent protective layer, a pressure-sensitive adhesive layer, and a release paper layer, and the medium protects The layer is arranged on the side of the microlens array layer away from the base film, the transparent protective layer is arranged on the side of the medium protection layer away from the microlens array layer, and the pressure-sensitive adhesive layer is arranged on the side of the microlens array layer. The color layer is on a side away from the lower medium layer, and the release paper layer is arranged on a side of the pressure-sensitive adhesive layer away from the color layer.