Optical product with gradient structural color

Abstract

The utility model discloses an optical product with gradually-changed structural colors, which comprises a bearing base body, a plurality of light-emitting diodes and a plurality of light-emitting diodes, the diffraction structure layer is arranged on the first surface of the bearing substrate; the diffraction structure layer comprises a plurality of micro-nano structures, and the micro-nano structures at least comprise a first micro-nano structure and a second micro-nano structure which are adjacently arranged; wherein an included angle a is formed between the first micro-nano structure and the first direction, an included angle b is formed between the second micro-nano structure and the first direction, and the included angle a is not equal to the included angle b. According to the optical product provided by the invention, the included angles between the micro-nano structures in every two adjacent areas and the first direction are different, and the included angle differences between the micro-nano structures in every two adjacent areas and the first direction are basically the same, so that the situation that the deflection angle between the micro-nano structures in the adjacent areas is too large is reduced; therefore, the structural color generated by the micro-nano structure does not jump visually, and the effect of color gradual change visually exists.

Description

Technical Field

[0001] This utility model relates to the fields of holography and decoration technology, and in particular to an optical product with gradient structural color. Background Technology

[0002] The use of diffraction structure color in submicron gratings is a common anti-counterfeiting method in the packaging of banknotes, cigarettes, alcohol, and daily chemical products. Its principle is based on the diffraction optical phenomenon produced when light waves strike the surface of a submicron grating structure, resulting in a visual impact different from ordinary printing, with vibrant colors, unique textures, and a dynamic feel.

[0003] However, in the existing technology, periodic gratings can diffract and separate incident light to produce structural colors. However, it is difficult to achieve color stability in existing grating diffraction structural colors. That is, the colors produced by existing grating diffraction structures are prone to jump phenomena, and it is even more difficult to achieve continuous and controllable color change effects.

[0004] In summary, there is an urgent need to provide a new design structure and manufacturing process to solve the technical problems existing in the prior art. Utility Model Content

[0005] Therefore, it is necessary for this utility model to provide an optical product with gradient structural color to solve the above-mentioned technical problems.

[0006] One technical solution of this utility model is:

[0007] An optical product with gradient structural colors, characterized in that it comprises:

[0008] A support substrate, the support substrate comprising a first surface and a second surface;

[0009] A diffraction structure layer is disposed on the first surface of the supporting substrate; the diffraction structure layer includes a plurality of micro-nano structures, the micro-nano structures including at least a first micro-nano structure and a second micro-nano structure disposed adjacently; wherein, the first micro-nano structure forms an angle α with a first direction, the second micro-nano structure forms an angle b with the first direction, and the angle α and the angle b are not equal.

[0010] As an improved technical solution of this utility model, the diffraction structure layer includes several groups of region blocks, the groups of region blocks are arranged in a preset manner, the groups of region blocks include several region block units, and the region block units in the groups of region blocks are arranged in a preset manner; there are two adjacent first region block units and second region block units in the groups of region blocks, wherein the first region block unit is provided with several first micro-nano structures, and the second region block unit is provided with several second micro-nano structures.

[0011] As an improved technical solution of this utility model, the group of regional blocks further includes a third regional block unit disposed adjacent to the second regional block unit. The third regional block unit is provided with a third micro-nano structure. The third micro-nano structure forms an angle c with the first direction, wherein the absolute value of the difference between the included angle a and the included angle b is equal to the absolute value of the difference between the included angle b and the included angle c.

[0012] As an improved technical solution of this utility model, at least one group of regional blocks contains micro-nano structures within several regional block units that form an angle with the first direction. The absolute value of the difference between the angle formed by the micro-nano structures in one adjacent regional block unit and the first direction is s, and the absolute value of the difference between the angle formed by the micro-nano structures in another adjacent regional block unit and the first direction is t. The difference between s and t is not equal, and the absolute value of the difference between s and t is not greater than 5°.

[0013] As an improved technical solution of this utility model, the absolute value of the difference between the included angle a and the included angle b is not less than 0.5° and not greater than 5°.

[0014] As an improved technical solution of this utility model, the micro-nano structure protrudes from and / or is recessed on the first surface of the supporting substrate.

[0015] As an improved technical solution of this utility model, the first surface of the supporting substrate is further provided with a polymer layer, and the micro-nano structure is disposed on the side of the polymer layer away from the supporting substrate to form the diffraction structure layer.

[0016] As an improved technical solution of this utility model, the surface of the micro-nano structure is provided with a refractive layer, and the refractive index of the refractive layer is not less than 2.

[0017] As an improved technical solution of this utility model, the surface of the refractive layer is provided with a protective layer, and the transmittance of the protective layer is not less than 50%.

[0018] As an improved technical solution of this utility model, the micro-nano structure is one or a combination of two or more of the following: microlens, cylindrical mirror, CD pattern, Fresnel lens, brushed texture, and submicron grating structure.

[0019] The beneficial effects of this utility model are:

[0020] This application provides an optical product with gradient structural color. By setting micro-nano structures on the surface of a substrate, and making the angles between the micro-nano structures in each pair of adjacent regions and the first direction different, while the angle differences between the micro-nano structures in each pair of adjacent regions and the first direction are basically the same, the change between the angles is controlled to be equal, or in other words, the change between the angles is continuous. This reduces the excessive deflection angle between the micro-nano structures in adjacent regions, so that the structural color produced by the micro-nano structures does not change abruptly, and there is a visual color gradient effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an optical product with gradient structural color according to the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of an optical product with gradient structural color according to the present invention;

[0023] Figure 3 This is a schematic diagram of another cross-section of an optical product with gradient structural color according to the present invention;

[0024] Figure 4 This is a schematic diagram of another cross-section of an optical product with gradient structural color according to the present invention;

[0025] Figure 5 This is a schematic diagram of another cross-section of an optical product with gradient structural color according to the present invention;

[0026] Figures 6a-6d This is another structural schematic diagram of an optical product with gradient structural color according to the present invention. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0028] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] Unless otherwise defined, all 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 pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The optical product provided in this application can be used in the fields of decorative materials technology and visual anti-counterfeiting technology. In the field of decorative materials, it can be applied to indoor and outdoor decorative panels, wallpaper, textiles, etc., achieving continuous changes in structural color according to the environmental atmosphere or user needs, greatly enhancing the artistry and personalization of decoration. In the field of visual anti-counterfeiting, its unique continuously changing structural color can serve as a difficult-to-imitate anti-counterfeiting feature, applied to currency, certificates, high-end product packaging, etc., effectively enhancing the anti-counterfeiting performance of products and protecting market order and consumer rights. The optical product is characterized by comprising:

[0031] The carrier substrate includes a first surface and a second surface; the carrier substrate can be a material such as glass, PET, PMMA, etc., or a thermosetting material or a photocurable material, or another structure, namely, the first surface of the carrier substrate is provided with a polymer layer, which can be a thermosetting material or a photocurable material.

[0032] A diffraction structure layer is located on the first surface of the substrate. The diffraction structure layer includes several micro / nano structures, each including at least a first micro / nano structure and a second micro / nano structure arranged adjacent to each other. The first micro / nano structure forms an angle α with a first direction, and the second micro / nano structure forms an angle b with the first direction, where angle α and angle b are not equal. Here, the first direction can be defined as a two-dimensional coordinate plane with the surface of the optical product as the X-axis. The micro / nano structures form angles with the X-axis, and adjacent micro / nano structures have different angles with the X-axis. For example, the first micro / nano structure has an angle of 90° with the X-axis, the adjacent second micro / nano structure has an angle of 89°, the third micro / nano structure adjacent to the second micro / nano structure has an angle of 88°, and so on. Micro / nano structures in adjacent regions are arranged in an arithmetic progression with a 1° angle difference. The angle variation described here is based on micro / nano structures arranged in a predetermined direction. As an improved technical solution of this utility model, the absolute value of the difference between the included angle α and the included angle b is not less than 0.5° and not greater than 5°. As an improved technical solution of this utility model, the micro / nano structure protrudes from and / or is recessed into the first surface of the supporting substrate.

[0033] As an improved technical solution of this utility model, the diffraction structure layer includes several groups of region blocks, which are arranged in a preset manner, for example, the group of region blocks are arranged along the Y-axis direction. Each group of region blocks includes several region block units, which are arranged in a preset manner, for example, the region block units are arranged along the X-axis direction. Each group of region blocks contains two adjacent first region block units and a second region block unit. The first region block unit has several first micro / nano structures, and the second region block unit has several second micro / nano structures. Taking one of the group of region blocks as an example, this group of region blocks includes several region block units arranged along the X-axis direction. Each region block unit includes several micro / nano structures. The angles formed by the micro / nano structures in adjacent region block units with the X-axis are different. For example, the group of region block units may contain first micro / nano structures and second micro / nano structures respectively. The angle difference between the micro / nano structures in adjacent region block units can be equal or unequal. When they are unequal, the difference between the different angles cannot be too large; only in this way can the continuous gradation of the structural color be better guaranteed.

[0034] As an improved technical solution of this utility model, the group of regional blocks further includes a third regional block unit adjacent to the second regional block unit. The third regional block unit contains a third micro / nano structure, which forms an angle c with the first direction. The absolute value of the difference between angle a and angle b is equal to the absolute value of the difference between angle b and angle c. In several regional block units within the same group of regional blocks, the difference between the angles between the micro / nano structures in any pair of adjacent regional block units and the first direction is equal, forming an arithmetic sequence. The smaller the difference between adjacent angles, the more continuous the gradient structure color and the richer the colors.

[0035] As an improved technical solution of this utility model, at least some micro-nano structures within several regional block units of the aforementioned group of regional blocks form an angle with the first direction. Specifically, the absolute value of the difference between the angle formed by the micro-nano structures in one adjacent regional block unit and the first direction is 's', and the absolute value of the difference between the angle formed by the micro-nano structures in another adjacent regional block unit and the first direction is 't'. 's' and 't' are not equal, and the absolute value of the difference between 's' and 't' is not greater than 5°. This provides that the difference in the angle between the micro-nano structures in adjacent regional block units and the first direction can be unequal, but this difference cannot be too large, otherwise it will affect the gradual transition effect. In this way, the entire change process has a smooth gradual transition, avoiding abrupt color changes and presenting a natural and smooth color transition effect.

[0036] As an improved technical solution of this utility model, the first surface of the supporting substrate is further provided with a polymer layer, and the micro / nano structure is disposed on the side of the polymer layer away from the supporting substrate, forming the diffraction structure layer. Similarly, the micro / nano structure in this technical solution can also be protruding and / or recessed on the surface of the polymer layer away from the supporting substrate.

[0037] As an improved technical solution of this utility model, the surface of the micro / nano structure is provided with a refractive layer, and the refractive index of the refractive layer is not less than 2. A metal oxide with a refractive index greater than 2 is vapor-deposited on the surface of the micro / nano structure to ensure the uniformity of the oxide, and the thickness of the refractive layer is controlled at 50~80nm; this high-refractive-index oxide coverage can effectively enhance the interaction between light and the micro / nano structure, resulting in narrow-band reflection.

[0038] As an improved technical solution of this utility model, the surface of the refractive layer is provided with a protective layer, and the transmittance of the protective layer is not less than 50%. By filling its surface with a transparent colloid, the stability and reliability of structural color changes are ensured.

[0039] As an improved technical solution of this utility model, the micro-nano structure is one or a combination of two or more of the following: microlens, cylindrical mirror, CD pattern, Fresnel lens, brushed texture, and submicron grating structure.

[0040] Please see Figure 1 as well as Figure 2 An optical product 100 with gradient structural colors, the optical product 100 comprising a set of region blocks, wherein the set of region blocks includes five region block units, namely A, B, C, D and E. Figure 1 As can be seen, each of the five regional block units contains micro / nano structures, and the angles between these micro / nano structures and the X-axis (also known as the first direction) are not the same. There is a difference in the angles between the micro / nano structures and the first direction within adjacent regional block units. This difference can be a constant or a variable value. Figure 1 The micro / nano structure given is a submicron grating; such as Figure 2 As shown, the optical product 100 includes a carrier substrate 10, which includes a first surface and a second surface disposed opposite to it. The carrier substrate 10 is made of PET. The first surface of the carrier substrate 10 is provided with a first micro-nano structure 20 (A), a second micro-nano structure 21 (B), a third micro-nano structure 22 (C), and a fourth micro-nano structure 23 (D). The cross-section of the micro-nano structure is rectangular. Because the angle formed between the micro-nano structure of each block unit and the first direction is different, the size of the rectangle formed by the cross-section of the micro-nano structure is also different in the same direction. Therefore, the sizes of the first micro-nano structure 20 (A), the second micro-nano structure 21 (B), the third micro-nano structure 22 (C), and the fourth micro-nano structure 23 (D) are different.

[0041] Please see Figure 3 Another optical product with a different structure is given. The first surface of the carrier substrate 10 is provided with a first micro-nano structure 20' (A), a second micro-nano structure 21' (B), a third micro-nano structure 22' (C) and a fourth micro-nano structure 23' (D). The cross-section of the micro-nano structure is triangular. Of course, the cross-section of the micro-nano structure can also be a submicron grating of other shapes.

[0042] Please see Figure 4 Another optical product includes a carrier substrate 10, which includes a first surface and a second surface disposed opposite to it. The carrier substrate 10 is made of PET. The first surface of the carrier substrate 10 is provided with a first micro-nano structure 20 (A), a second micro-nano structure 21 (B), a third micro-nano structure 22 (C), and a fourth micro-nano structure 23 (D). It is also provided with a refractive layer 30, which is made of a high refractive index material and has a refractive index of not less than 2. The refractive layer 30 covers the first micro-nano structure 20 (A), the second micro-nano structure 21 (B), the third micro-nano structure 22 (C), and the fourth micro-nano structure 23 (D). The thickness of the refractive layer 30 is 50~80nm and it has a certain transmittance.

[0043] Please see Figure 5 ,exist Figure 4 In addition to the above, a protective layer 40 is also included. The protective layer 40 is disposed on the surface of the refractive layer 30. The protective layer 40 has a certain transmittance, and the transmittance is not less than 50%. The protective layer 40 can be a photocurable adhesive or a thermocurable adhesive, such as a UV adhesive, or other polymer materials.

[0044] Please see Figures 6a-6d The structures of different optical products are given, such as Figure 6a , 6b As shown, optical product 200 is a pentagram and optical product 300 is a circle. The submicron grating of this optical product is not based on a single area block, but is achieved by continuously changing the grating orientation angle (the angle between the grating and the first direction). This continuously variable angle grating can be implemented through software programming based on feature point sampling methods, and finally, the photolithography fabrication of this subwavelength variable angle grating is achieved through high-resolution imaging lithography or electron beam lithography. Figure 6c , 6d As shown, the pattern formed by the submicron grating-based regional block units in optical product 400 is created by an inward-outward gradient design method, while the pattern formed by the submicron grating-based regional block units in optical product 500 is created by a fan-shaped gradient design method.

[0045] The method for forming a submicron grating in this application is as follows: Using a dual-beam interference lithography machine, based on the grating equation L=2sinӨ / λ (L: grating frequency, Ө: interference angle, λ: laser wavelength), with a laser wavelength λ of 395nm, the dual-beam angle Ө is adjusted to 33.6 degrees to obtain bright and dark interference fringes of 2800 lines / mm. The photoresist plate is placed on the X and Y moving platforms. By adjusting the height, the two beams converge at the interference point on the recording interface of the photoresist plate. The angle control device is activated, and during the displacement of the X and Y platforms, the dual-beam angle is continuously changed according to a preset program. During the change, the position and angle changes are monitored and fed back in real time by a detection device, and the angle change parameters are adjusted to ensure the smoothness of the gradient. After exposure, a relief grating structure is obtained through development.

[0046] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail above with reference to the accompanying drawings. Many specific details are set forth in the above description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An optical product with gradient structural colors, characterized in that, include: A support substrate, the support substrate comprising a first surface and a second surface; A diffraction structure layer is located on the first surface of the supporting substrate; the diffraction structure layer includes a plurality of micro-nano structures, the micro-nano structures including at least a first micro-nano structure and a second micro-nano structure arranged adjacent to each other; wherein, the first micro-nano structure forms an angle α with a first direction, the second micro-nano structure forms an angle b with the first direction, and the angle α and the angle b are not equal.

2. The optical product with gradient structural color according to claim 1, characterized in that, The diffraction structure layer includes several groups of region blocks, which are arranged in a preset manner. Each group of region blocks includes several region block units, which are arranged in a preset manner. Each group of region blocks contains two adjacent first region block units and a second region block unit. The first region block unit is provided with several first micro-nano structures, and the second region block unit is provided with several second micro-nano structures.

3. The optical product with gradient structural color according to claim 2, characterized in that, The group of regional blocks also includes a third regional block unit disposed adjacent to the second regional block unit. The third regional block unit is provided with a third micro-nano structure. The third micro-nano structure forms an angle c with the first direction, wherein the absolute value of the difference between the included angle a and the included angle b is equal to the absolute value of the difference between the included angle b and the included angle c.

4. The optical product with gradient structural color according to claim 2, characterized in that, At least one set of regional blocks contains micro-nano structures within several regional block units that form an angle with the first direction. The absolute value of the difference between the angle formed by the micro-nano structures in one adjacent regional block unit and the first direction is s, and the absolute value of the difference between the angle formed by the micro-nano structures in another adjacent regional block unit and the first direction is t. The difference between s and t is not equal, and the absolute value of the difference between s and t is not greater than 5°.

5. The optical product with gradient structural color according to claim 1, characterized in that, The absolute value of the difference between the included angle a and the included angle b is not less than 0.5° and not greater than 5°.

6. The optical product with gradient structural color according to claim 1, characterized in that, The micro / nano structure protrudes from and / or is recessed on the first surface of the supporting substrate.

7. The optical product with gradient structural color according to claim 1, characterized in that, The first surface of the support substrate is further provided with a polymer layer, and the micro-nano structure is disposed on the side of the polymer layer away from the support substrate to form the diffraction structure layer.

8. The optical product with gradient structural color according to claim 1, characterized in that, The surface of the micro / nano structure is provided with a refractive layer, and the refractive index of the refractive layer is not less than 2.

9. An optical product with gradient structural color according to claim 8, characterized in that, The surface of the refractive layer is provided with a protective layer, and the transmittance of the protective layer is not less than 50%.

10. An optical product with gradient structural color according to claim 1, characterized in that, The micro / nano structure is one or a combination of two or more of the following: microlens, cylindrical mirror, CD pattern, Fresnel lens, brushed texture, and submicron grating structure.

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