Electromagnetic reflecting film

Abstract

The present application relates to a kind of electromagnetic reflection films, at least including first reflective layer and second reflective layer, first reflective layer includes conductive layer and multiple first convex structures spaced on conductive layer along first direction, second reflective layer is stacked on the side of first reflective layer close to first convex structure, second reflective layer includes substrate and multiple second convex structures spaced on substrate along second direction, second convex structure is located on the side of substrate away from first reflective layer, electromagnetic wave can be incident to first reflective layer by second reflective layer.The electromagnetic reflection film by setting first convex structure and second convex structure, make the reflection and diffuse reflection of incident electromagnetic wave in the process of propagation, change the original propagation direction of electromagnetic wave and make electromagnetic wave disorder propagation, and then some regional signal shielding and the electromagnetic wave intensity in specified range can be enhanced.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to an electromagnetic reflective film. Background Technology

[0002] In radio communication, electromagnetic waves exhibit the physical characteristic of rectilinear propagation. During propagation, electromagnetic waves travel in a straight line from the source in a fixed direction. Therefore, receiving equipment must be positioned in the direction of propagation to receive the signal. Furthermore, some devices that do not need to receive signals may experience interference from the electromagnetic waves if they are positioned in the direction of propagation.

[0003] Therefore, there is an urgent need for a device that can change the direction of electromagnetic wave propagation, so that electromagnetic waves can propagate in a disordered manner, thereby meeting the needs of signal shielding in some areas and expanding the propagation range. Summary of the Invention

[0004] The purpose of this invention is to provide an electromagnetic reflective film that can change the direction of electromagnetic wave propagation and allow it to propagate randomly, thereby expanding the propagation range.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electromagnetic reflective film is provided, comprising at least a first reflective layer and a second reflective layer. The first reflective layer includes a conductive layer and a plurality of first protrusions spaced apart on the conductive layer along a first direction. The second reflective layer is stacked on the side of the first reflective layer near the first protrusions. The second reflective layer includes a substrate and a plurality of second protrusions spaced apart on the substrate along a second direction. The second protrusions are located on the side of the substrate away from the first reflective layer. Electromagnetic waves can pass through the second reflective layer and be incident on the first reflective layer.

[0007] Furthermore, the first direction and the second direction are set at an angle.

[0008] Furthermore, the first direction and the second direction are perpendicular to each other.

[0009] Furthermore, the extension direction of the first protruding structure is perpendicular to the first direction, and the extension direction of the second protruding structure is perpendicular to the second direction.

[0010] Furthermore, the surface of the conductive layer near the first protruding structure is a reflective surface, and part or all of the surface of the first protruding structure facing away from the conductive layer is not parallel to the reflective surface, and part or all of the surface of the second protruding structure facing away from the substrate is not parallel to the reflective surface.

[0011] Furthermore, the cross-sections of the first protruding structure and the second protruding structure are circular.

[0012] Furthermore, along the first direction, the distance between two adjacent first protruding structures is the first reflection distance, and the plurality of first reflection distances are arranged with a trend of being larger in the middle and smaller on both sides. Along the second direction, the distance between two adjacent second protruding structures is the second reflection distance, and the plurality of second reflection distances are arranged with a trend of being larger in the middle and smaller on both sides.

[0013] Furthermore, an adhesive medium is provided between the first reflective layer and the second reflective layer, and the first reflective layer and the second reflective layer are bonded together by the adhesive medium.

[0014] Furthermore, the electromagnetic reflective film also includes an adhesive film layer, which is disposed on the second reflective layer, and the second protruding structure is embedded in the adhesive film layer.

[0015] Furthermore, the adhesive film layer has raised ridges or grooves on the side away from the second reflective layer, and the raised ridges or grooves are distributed in a mesh pattern.

[0016] The advantages of this invention compared to the prior art are:

[0017] The electromagnetic reflective film of the present invention can cause electromagnetic waves to be reflected and diffusely reflected multiple times on the surface of the first reflective layer and the second protruding structure surface of the second reflective layer, thereby changing the propagation direction of the electromagnetic waves and causing them to propagate randomly to the second reflective layer side of the electromagnetic reflective film. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the electromagnetic reflective film according to an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view along line AA of the electromagnetic reflective film according to an embodiment of the present invention.

[0020] Figure 3 This is a top view of the electromagnetic reflective film according to an embodiment of the present invention.

[0021] Figure 4 This is a top view of an electromagnetic reflective film according to another embodiment of the present invention.

[0022] In the picture:

[0023] 1. First reflective layer; 10. Conductive layer; 11. First protruding structure; 2. Second reflective layer; 20. Substrate; 21. Second protruding structure; 3. Adhesive film layer. Detailed Implementation

[0024] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 1 and Figure 2 As shown, the present invention provides an electromagnetic reflective film comprising at least a first reflective layer 1 and a second reflective layer 2. The first reflective layer 1 includes a conductive layer 10 and a plurality of first protrusions 11 spaced apart along a first direction on the conductive layer 10. The second reflective layer 2 is stacked on the side of the first reflective layer 1 near the first protrusions 11. The second reflective layer 2 includes a substrate 20 and a plurality of second protrusions 21 spaced apart along a second direction on the substrate 20. The second protrusions 21 are located on the side of the substrate 20 away from the first reflective layer 1. Electromagnetic waves can pass through the second reflective layer 2 and be incident on the first reflective layer 1. It is understood that the electromagnetic waves used in radio communication have long wavelengths and cannot penetrate the conductive layer 10. When an electromagnetic wave is incident on the surface of the conductive layer 10, it will be reflected, and the reflection normal will be perpendicular to the surface of the conductive layer 10. When an electromagnetic wave is incident on the first protrusions 11 on the conductive layer 10, due to the change in the direction of the reflection normal with the surface shape of the first protrusions 11, the electromagnetic wave undergoes diffuse reflection and propagates in different directions. In this embodiment, when electromagnetic waves enter from one side of the second reflective layer 2, a portion of the electromagnetic waves are incident on the surface of the second protruding structure 21 and undergo diffuse reflection, changing their original propagation direction and propagating disorderly towards the second reflective layer 2 side of the electromagnetic reflective film. The remaining portion of the electromagnetic waves passes through the substrate 20 of the second reflective layer 2 and is incident on the surfaces of the conductive layer 10 and the first protruding structure 11 of the first reflective layer 1. At this time, the electromagnetic waves are reflected and diffusely reflected on the surfaces of the conductive layer 10 and the first protruding structure 11, respectively, causing the electromagnetic waves to change their original propagation direction and propagate disorderly towards the second reflective layer 2 side. Electromagnetic waves reflected back from the first reflective layer 1 to the second reflective layer 2 side partially pass through the gaps between the second protruding structures 21 and continue to propagate, while the remaining portion of the electromagnetic waves are incident on the surface of the second protruding structure 21 and undergo diffuse reflection, being reflected back to the surface of the first reflective layer 1 again. This process repeats, causing the electromagnetic waves to be reflected and diffusely reflected multiple times on the surfaces of the first reflective layer 1 and the second protruding structure 21 of the second reflective layer 2, changing the propagation direction of the electromagnetic waves and causing them to propagate disorderly towards the second reflective layer 2 side of the electromagnetic reflective film. This can then form signal shielding in the space on one side of the first reflective layer 1 of the electromagnetic reflective film, enhance the electromagnetic wave intensity in the space on one side of the second reflective layer 2 of the electromagnetic reflective film, and expand the original coverage range of the electromagnetic waves.

[0026] Specifically, the first direction and the second direction are arranged at an angle. It is understood that this angled arrangement of the two directions helps to create a grid-like projection of the first protruding structure 11 and the second protruding structure 21 onto the surface of the conductive layer 10, allowing electromagnetic waves to pass through the gaps between the protruding structures and enter the first reflective layer 1. Of course, in other embodiments, the first and second directions can also be arranged parallel, with gaps between the projections of the first protruding structure 11 and the second protruding structure 21 onto the surface of the conductive layer 10, allowing electromagnetic waves to pass through the gaps between the protruding structures and enter the first reflective layer 1.

[0027] Specifically, refer to Figure 3 In the illustrated embodiment, the first direction and the second direction are perpendicular to each other. It is understood that when electromagnetic waves successively enter the surfaces of the second protruding structure 21 and the first protruding structure 11, and the second protruding structure 21 is set at an angle to the first protruding structure 11, the directions of the two protruding structures are different. This causes the electromagnetic waves, after being incident on the surfaces of the protruding structures, to have different directions after reflection. Furthermore, this causes the reflected electromagnetic waves to propagate disorderly to the space on one side of the second reflective layer 2 of the electromagnetic reflective film, enhancing the electromagnetic wave intensity in that area and expanding the propagation range. In this embodiment, the first direction and the second direction are perpendicular to each other. In the vertical direction on the surface of the electromagnetic reflective film, the projection distribution of the first protruding structure 11 and the second protruding structure 21 is more uniform, thereby making the reflection and diffuse reflection of electromagnetic waves in each region more uniform.

[0028] Specifically, the extension direction of the first protruding structure 11 is perpendicular to the first direction, and the extension direction of the second protruding structure 21 is perpendicular to the second direction. In this embodiment, the first protruding structure 11 and the second protruding structure 21 are metal wires or metal strips, and are respectively arranged at intervals along the perpendicular directions of the first and second directions. Of course, in other embodiments, the first protruding structure 11 and the second protruding structure 21 can also be other metal structures. The projections of the first protruding structure 11 and the second protruding structure 21 onto the reflective surface of the conductive layer 10 after the overlap of the first reflective layer 1 and the second reflective layer 2 form a mesh, which is beneficial for the uniform diffuse reflection of electromagnetic waves in this area. At the same time, the first protruding structure 11 is arranged parallel to each other along the surface of the conductive layer 10, and the second protruding structure 21 is arranged parallel to each other along the surface of the substrate 20, which is simple in structure and easy to manufacture.

[0029] Specifically, the surface of the conductive layer 10 near the first protruding structure 11 is a reflective surface. Part or all of the surface of the first protruding structure 11 facing away from the conductive layer 10 is not parallel to the reflective surface, and part or all of the surface of the second protruding structure 21 facing away from the substrate 20 is also not parallel to the reflective surface. It is understood that when an electromagnetic wave is incident on the electromagnetic reflection film, diffuse reflection occurs on the surface of the first protruding structure 11 facing away from the conductive layer 10 and on the surface of the second protruding structure 21 facing away from the substrate 20. The fact that part or all of the surfaces of the first protruding structure 11 and the second protruding structure 21 are not parallel to the reflective surface causes the propagation direction of the electromagnetic wave after diffuse reflection on the first protruding structure 11 and the second protruding structure 21 to differ from the propagation direction after reflection from the reflective surface of the conductive layer 10, further causing the reflected electromagnetic wave to propagate disorderly.

[0030] It should be noted that the surface of the first protruding structure 11 facing away from the conductive layer 10 is the surface away from the conductive layer 10, with the largest cross-section of the first protruding structure 11 parallel to the conductive layer 10 as the interface. Alternatively, it can be understood as the surface of the first protruding structure 11 that cannot be illuminated by light from the conductive layer 10. Similarly, the surface of the second protruding structure 21 facing away from the substrate 20 is the surface away from the substrate 20, with the largest cross-section of the second protruding structure 21 parallel to the substrate 20 as the interface. Again, it can be understood as the surface of the second protruding structure 21 that cannot be illuminated by light from the substrate 20.

[0031] Specifically, the cross-sections of the first protruding structure 11 and the second protruding structure 21 are circular. The cross-section is a radial section of the protruding structure. It can be understood that by setting the protruding structure to a circular shape, the direction of the reflection normal changes continuously when the electromagnetic wave is incident on the surface of the protruding structure, thereby causing a continuous change in the propagation direction of the reflected electromagnetic wave, and further causing the reflected electromagnetic wave to propagate randomly. Of course, in other embodiments, the cross-sections of the first protruding structure 11 and the second protruding structure 21 can also be triangular, elliptical, rectangular, prismatic, or other geometric shapes.

[0032] In another embodiment, such as Figure 4As shown, along the first direction, the distance between two adjacent first protruding structures 11 is the first reflection distance, and multiple first reflection distances are arranged with a trend of being larger in the middle and smaller on both sides. Along the second direction, the distance between two adjacent second protruding structures 21 is the second reflection distance, and multiple second reflection distances are arranged with a trend of being larger in the middle and smaller on both sides. It can be understood that the reflection distance between the first protruding structures 11 and the second protruding structures 21 is arranged with a trend of being larger in the middle and smaller on both sides, so that the distribution density of the first protruding structures 11 and the second protruding structures 21 in the middle part of the electromagnetic reflective film is less than the distribution density in the two sides, and so that the projection of the two on the reflective surface of the conductive layer 10 has a distribution density in the middle part less than the distribution density in the surrounding parts. When an electromagnetic wave is incident on the surface of the electromagnetic reflective film, the diffuse reflection intensity of the electromagnetic wave in the surrounding parts is greater than that in the middle part, causing the electromagnetic wave to propagate into the peripheral space of the electromagnetic reflective film, expanding the propagation range of the electromagnetic wave, and increasing the electromagnetic wave intensity in the peripheral region of the electromagnetic reflective film.

[0033] Specifically, an adhesive medium is provided between the first reflective layer 1 and the second reflective layer 2, and the first reflective layer 1 and the second reflective layer 2 are bonded together by the adhesive medium. In this embodiment, the adhesive medium fills the gap between two adjacent first protrusions 11, and the filling thickness of the adhesive medium is not less than the distance between the two opposing surfaces of the conductive layer 10 and the substrate 20. Providing an adhesive medium between the first reflective layer 1 and the second reflective layer 2 can, on the one hand, connect and fix the first reflective layer 1 and the second reflective layer 2, and on the other hand, fill the gap between the first protrusions 11, avoiding gaps between the first reflective layer 1 and the second reflective layer 2, which could cause defects such as bulging, denting, or wrinkling of the conductive layer 10 when the electromagnetic reflective film is subjected to pressure or temperature changes.

[0034] Specifically, the substrate 20 is made of PI material. It is understood that electromagnetic waves can pass through the substrate 20 and enter the surface of the conductive layer 10. Therefore, the material of the substrate 20 does not have electromagnetic shielding properties or has very weak electromagnetic shielding properties.

[0035] Reference Figure 1 As shown, the electromagnetic reflective film also includes an adhesive film layer 3, which is disposed on the second reflective layer 2, and the second protruding structure 21 is embedded in the adhesive film layer 3. It can be understood that the adhesive film layer 3 is beneficial for protecting the second protruding structure 21, and at the same time, it can be connected to other components.

[0036] Specifically, the adhesive film layer 3 has raised ribs or grooves on the side away from the second reflective layer 2, and the raised ribs or grooves are distributed in a mesh pattern. It can be understood that setting raised ribs or grooves can increase the adhesion of the adhesive film layer 3 surface, which is beneficial for the adhesive film layer 3 to connect with other components.

[0037] Specifically, the conductive layer 10 is a metal layer, conductive rubber, or other conductive material, and the conductive layer 10 must have good electromagnetic shielding performance.

[0038] The significant effect of this embodiment is that the electromagnetic reflective film, through multiple reflections and diffuse reflections on the surface of the first reflective layer 1 and the surface of the second protruding structure 21 of the second reflective layer 2, alters the propagation direction of electromagnetic waves, causing them to propagate disorderly towards the second reflective layer 2 side of the electromagnetic reflective film. This, in turn, creates signal shielding in the space on the first reflective layer 1 side of the electromagnetic reflective film, enhances the electromagnetic wave intensity in the space on the second reflective layer 2 side of the electromagnetic reflective film, and expands the original coverage area of ​​the electromagnetic waves.

[0039] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. An electromagnetic reflective film, characterized in that, It includes at least a first reflective layer (1) and a second reflective layer (2). The first reflective layer (1) includes a conductive layer (10) and a plurality of first protrusions (11) spaced apart on the conductive layer (10) along a first direction. The second reflective layer (2) is stacked on the side of the first reflective layer (1) close to the first protrusions (11). The second reflective layer (2) includes a substrate (20) and a plurality of second protrusions (21) spaced apart on the substrate (20) along a second direction. The second protrusions (21) are located on the side of the substrate (20) away from the first reflective layer (1). Electromagnetic waves can pass through the second reflective layer (2) and be incident on the first reflective layer (1). Electromagnetic waves are reflected and diffusely reflected multiple times on the surface of the first reflective layer (1) and the surface of the second protruding structure (21) of the second reflective layer (2), causing the propagation direction of the electromagnetic waves to change and propagate disorderly to the second reflective layer (2) side of the electromagnetic reflective film. Along the first direction, the distance between two adjacent first protruding structures (11) is the first reflection distance, and multiple first reflection distances are arranged with a trend of being larger in the middle and smaller on both sides. Along the second direction, the distance between two adjacent second protruding structures (21) is the second reflection distance, and multiple second reflection distances are arranged with a trend of being larger in the middle and smaller on both sides.

2. The electromagnetic reflective film according to claim 1, characterized in that, The first direction and the second direction are set at an angle.

3. The electromagnetic reflective film according to claim 2, characterized in that, The first direction and the second direction are perpendicular to each other.

4. The electromagnetic reflective film according to claim 1, characterized in that, The extension direction of the first protruding structure (11) is perpendicular to the first direction, and the extension direction of the second protruding structure (21) is perpendicular to the second direction.

5. The electromagnetic reflective film according to claim 4, characterized in that, The surface of the conductive layer (10) near the first protruding structure (11) is a reflective surface. Part or all of the surface of the first protruding structure (11) facing away from the conductive layer (10) is not parallel to the reflective surface. Part or all of the surface of the second protruding structure (21) facing away from the substrate (20) is not parallel to the reflective surface.

6. The electromagnetic reflective film according to claim 5, characterized in that, The cross-sections of the first protruding structure (11) and the second protruding structure (21) are circular.

7. The electromagnetic reflective film according to claim 1, characterized in that, An adhesive medium is provided between the first reflective layer (1) and the second reflective layer (2), and the first reflective layer (1) and the second reflective layer (2) are bonded together by the adhesive medium.

8. The electromagnetic reflective film according to claim 1, characterized in that, The electromagnetic reflective film also includes an adhesive film layer (3), which is disposed on the second reflective layer (2), and the second protruding structure (21) is embedded in the adhesive film layer (3).

9. The electromagnetic reflective film according to claim 8, characterized in that, The adhesive film layer (3) has protrusions or grooves on the side away from the second reflective layer (2), and the protrusions or grooves are distributed in a mesh pattern.

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