A cover plate
By creating grooves in the metal layer of the 3C product cover to make it non-conductive, and combining the design of the dielectric layer and the protective layer, the problem of excessive electromagnetic shielding effect is solved, achieving good signal and wireless charging safety, while meeting appearance requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LENS TECH CHANGSHA
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-02
AI Technical Summary
Existing 3C product covers have the problem of excessive electromagnetic shielding effect, which affects signal reception, and the conductivity poses a risk of internal components being burned out by the current during wireless charging.
Grooves are created in the metal layer to make it non-conductive, and different types of metal materials are combined through the design of dielectric and protective layers to achieve specific color effects and metallic textures.
It effectively solves the problem of poor signal, avoids the risk of internal components being burned by current during wireless charging, and meets the market's requirements for appearance.
Smart Images
Figure CN224319383U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of 3C product cover technology, specifically to a cover. Background Technology
[0002] A cover, in application, can be a back cover, front cover, a component, or an entire housing. It can refer to a removable or non-removable outer shell covering 3C products, including but not limited to: mobile phones, tablets, smartwatches, smart translation devices, computers (laptops, desktops) and related accessories, digital measuring equipment, and smart glasses. Covers protect the internal components of the product and provide a certain degree of waterproofing, dustproofing, and shock resistance.
[0003] With the arrival of the 5G era and the widespread adoption of 3C products such as smartphones, smartwatches, and smart wearables, consumers' demands for electronic products are no longer limited to performance and lifespan; their requirements for visual effects are also increasing.
[0004] To achieve the aesthetic requirements of 3C products, special color effects can be achieved by electroplating a dielectric film onto the cover plate of the product and then superimposing a metal film.
[0005] However, metals generally have high conductivity, and many applications require them to be non-conductive. For example, some electronic products have wireless charging capabilities. If the cover is conductive, it can cause the internal components of the electronic product to be burned out by the current. Furthermore, using a metal layer for the back cover of an electronic product can create an electromagnetic shielding effect, affecting the electronic device's signal reception. Therefore, the conductivity of the metal film layer must be addressed when applying metal to the cover of electronic products. Utility Model Content
[0006] The purpose of this invention is to overcome the problem of excessive electromagnetic shielding effect of cover plates for 3C products in the existing technology.
[0007] To achieve the above objectives, the present invention provides a cover plate, which includes a substrate layer 1, a dielectric layer 2 and a metal layer 3 stacked sequentially.
[0008] The metal layer 3 has a groove A, the groove A is inward in the depth direction and penetrates the metal layer 3, so that the metal layer 3 is non-conductive.
[0009] Preferably, the trenches A are configured as a plurality of interconnected trenches A, which divide the metal layer 3 into at least two grid cells.
[0010] The length L of any two nodes connected in the grid cell is less than (λ / 20), where λ is the wavelength of the antenna signal communication wave.
[0011] In a preferred embodiment, the trench A includes a plurality of transverse trenches and a plurality of longitudinal trenches, and the transverse trenches and the longitudinal trenches are connected and divide the metal layer 3 into a grid of interwoven transverse and longitudinal trenches, the grid trenches dividing the metal layer 3 into the grid units;
[0012] The transverse trench is defined to extend from one transverse side of the metal layer to the other side, and the longitudinal trench extends from one longitudinal side of the metal layer to the other side.
[0013] Preferably, the medium layer 2 includes a texture layer 21, and the texture layer 21 includes a plurality of texture units.
[0014] In a preferred embodiment, each of the mesh cells covers at least one of the texture cells.
[0015] Preferably, the area of a single texture unit is >10. -4 mm 2 .
[0016] In a preferred embodiment, the area of a single grid cell is a first area, and the sum of the areas of the single grid cell and the trench A adjacent to the single grid cell is a second area, wherein the ratio of the first area to the second area is less than the seepage threshold of the grid cell.
[0017] Preferably, each of the grid cells is square, and the ratio of the first area to the second area is less than 59%.
[0018] In a preferred embodiment, each of the grid cells is a regular hexagon, and the ratio of the first area to the second area is less than 69.8%.
[0019] In a preferred embodiment, each of the grid cells is an equilateral triangle, and the ratio of the first area to the second area is less than 50%.
[0020] Preferably, the width of the groove A is W, where 1μm ≤ W < 100μm.
[0021] More preferably, the width of the groove A is W, where 5μm≤W≤20μm.
[0022] In a preferred embodiment, the trench A extends through the dielectric layer 2.
[0023] Preferably, the cover plate further includes a protective layer 4 disposed on the outside of the metal layer 3, and the material of the protective layer 4 has an absorption rate of 50%-80% in the ultraviolet band.
[0024] In a preferred embodiment, the material of the protective layer 4 has an absorption rate of 50%-80% at 315nm-400nm.
[0025] Compared with the prior art, the present invention has at least the following advantages:
[0026] This invention, through the design of grooves, effectively solves the problem of poor signal in 3C products while ensuring that the cover plate has a metallic texture; and it can also avoid the risk of internal components being burned by current when wirelessly charging 3C products.
[0027] The cover plate provided by this utility model can be made of different types of metal, thus allowing for different colors, such as high-brightness silver, high-saturation orange-red, gray, etc., meeting the market's requirements for the appearance of 3C products.
[0028] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of a preferred membrane structure of a cover plate provided by this utility model;
[0030] Figure 2 This is a top view of the microstructure of a preferred cover plate provided by this utility model.
[0031] Explanation of reference numerals in the attached figures
[0032] 1. Substrate layer; 2. Dielectric layer; 3. Metal layer; 4. Protective layer; 21. Texture layer; 22. High refractive index layer; 23. Low refractive index layer; 24. Bonding layer; A. Trench; W. Trench width. Detailed Implementation
[0033] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0034] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0035] As mentioned above, see Figures 1-2 The present invention provides a cover plate, which includes a substrate layer 1, a dielectric layer 2 and a metal layer 3 stacked in sequence.
[0036] The metal layer 3 has a groove A, the groove A is inward in the depth direction and penetrates the metal layer 3, so that the metal layer 3 is non-conductive.
[0037] This invention makes the metal layer non-conductive by setting grooves, which can effectively solve the problem of poor signal of 3C products while ensuring that the cover has a metallic texture; and can also avoid the risk of internal components being burned by current when wirelessly charging 3C products.
[0038] It should be noted that, Figure 1 The term "inner" refers to the side facing the inside of the electronic product after the cover plate is assembled into the electronic product, while the side facing the outside is called "outer".
[0039] In one specific embodiment, the substrate layer 1 is a transparent substrate, which may be selected from, but is not limited to, a glass substrate, a ceramic substrate, a gemstone substrate, and a plastic substrate.
[0040] In one specific embodiment, the trench A divides the metal layer 3 into at least two grid cells, where the length L of any two connected nodes in the grid cell is less than (λ / 20), and λ is the wavelength of the antenna signal communication wave. This arrangement ensures that the metal layer has the fewest possible trenches while avoiding shielding of the antenna signal by the metal.
[0041] In one specific implementation, λ is the wavelength of the 5G antenna signal communication wave, λ=85mm, L<4.25mm.
[0042] In one specific embodiment, the trench A includes a plurality of transverse trenches and a plurality of longitudinal trenches, and the transverse trenches and the longitudinal trenches are connected and divide the metal layer 3 into a grid of interwoven transverse and longitudinal trenches, the grid trenches dividing the metal layer 3 into the grid units;
[0043] The transverse trench is defined to extend from one transverse side of the metal layer to the other side, and the longitudinal trench extends from one longitudinal side of the metal layer to the other side.
[0044] In one specific embodiment, the dielectric layer 2 and the metal layer 3 are used together to achieve a specific color for the cover plate.
[0045] In one specific embodiment, the dielectric layer 2 further includes a bonding layer 24 and a stacked structure of high and low refractive index materials arranged sequentially. The stacked structure of high and low refractive index materials may include one or more sets of high refractive index layers 22 and low refractive index layers 23. This structure of the dielectric layer 2 is used to achieve specific optical effects in this invention, such as enhancing reflection, transmission, or producing specific color effects.
[0046] In order to increase the mechanical interlocking effect and reduce the risk of peeling of each film layer, in a specific embodiment, the material forming the bonding layer 24 needs to form strong chemical bonds with the substrate layer 1, such as Si-O bonds, Si-C bonds, Si-O-Al bonds; or the bonding layer 24 has a nanoscale rough surface.
[0047] In one specific embodiment, the material of the bonding layer 24 is selected from at least one of Si, ZrO2, and Al2O3.
[0048] In one specific embodiment, the refractive index n of the high-refractive layer 22 is greater than 1.9, and the refractive index 1.3 < n < 1.7 of the low-refractive layer 23.
[0049] From an economic perspective, the high-refractive-index layer 22 is preferably one or more of TiO2, Nb2O5, and Ti3O5, and the low-refractive-index layer 23 is preferably one or more of SiO2 and MgF2.
[0050] In one specific embodiment, the metal layer 3 is used to brighten the color of the cover plate and / or give the cover plate a metallic appearance.
[0051] In one specific embodiment, the material of the metal layer 3 is selected from Al, Nb, or Cu to achieve a high-brightness silver, high-saturation orange-red, or gray effect on the cover plate.
[0052] In order to make the cover plate have a richer appearance, in one specific embodiment, the medium layer 2 includes a texture layer 21, and the texture layer 21 includes a plurality of texture units.
[0053] To avoid texture distortion on the surface of the substrate layer 1, in one specific embodiment, each mesh cell covers at least one texture cell.
[0054] In a preferred embodiment, the texture layer 21 is a UV brushed texture layer.
[0055] In one specific embodiment, one side of the texture layer 21 is tightly bonded to one side of the substrate layer 1, and the other side is tightly bonded to the bonding layer 24.
[0056] In a preferred embodiment, the cover plate further includes a protective layer 4 disposed outside the metal layer 3, and the material of the protective layer 4 has an absorption rate of 50%-80% in the ultraviolet band. The inventors of this utility model have discovered that, in this preferred embodiment, the energy required to open the trench A can be saved without increasing the thickness of the protective layer 4, and the risk of cracking due to excessive thickness of the protective layer 4 is effectively reduced.
[0057] In a preferred embodiment, the material of the protective layer 4 needs to have good adhesion to the metal layer 3 and needs to meet the requirement of high hardness.
[0058] In one specific embodiment, the material of the protective layer 4 has an absorption rate of 50%-80% at 315nm-400nm.
[0059] In one specific embodiment, the material of the protective layer 4 has an absorption rate of 50%-80% at 345nm-355nm.
[0060] In one specific embodiment, the material of the protective layer 4 is selected from at least one of Si3N4, Si, Ge, and SiC.
[0061] In a preferred embodiment, when the material of the metal layer 3 is Al, the material of the protective layer 4 is Si3N4 and Si; Si3N4 is used to protect the metal layer 3 from scratches or oxidation; Si can reduce the reflection generated by the metal layer 3 when the trench A is opened, thereby reducing the power required to set the trench A, and can also reduce heat accumulation, preventing the metal layer 3 from forming molten residue due to overheating, thereby reducing the energy density required to continuously open the trench A.
[0062] In a preferred embodiment, when the material forming the metal layer 3 is Cu, in order to increase the adhesion of the coating layer, a CuO layer is also provided between the low refractive layer 23 and the metal layer 3, and the thickness of the CuO layer is 5-10 nm.
[0063] In one specific embodiment, the thickness of each film layer in the cover plate is designed using McLeod optical thin film design software.
[0064] In one specific embodiment, the thickness of the substrate layer 1 is 0.05mm-0.15mm.
[0065] In one specific embodiment, the thickness of the texture layer 21 is 20-30 μm.
[0066] In one specific embodiment, the thickness of the bonding layer 24 is 3-5 nm.
[0067] In one specific embodiment, the thickness of the high-refractive layer 22 is 10-120 nm.
[0068] In one specific embodiment, the thickness of the low-refractive layer 23 is 10-120 nm.
[0069] In one specific embodiment, the thickness of the metal layer 3 is 25-60 nm.
[0070] In one specific embodiment, the thickness of the protective layer 4 is 10-40 nm.
[0071] For example, in the high-brightness silver cover plate, the thickness of the high-refractive layer 22 is 45-120nm, the thickness of the high-refractive layer 22 is 45-120nm, and the thickness of the metal layer 3 is 25-50nm.
[0072] For example, in a high-saturation orange-red cover plate, the thickness of the high-refractive layer 22 is 10-20 nm, and the thickness of the metal layer 3 is 25-60 nm.
[0073] For example, in the gray cover plate, the thickness of the high refractive layer 22 is 10-120 nm, and the thickness of the metal layer 3 is 25-60 nm.
[0074] In one specific implementation, the area of a single texture unit is >10. -4 mm 2 .
[0075] In one specific implementation, the area of a single grid cell is a first area, and the sum of the areas of the single grid cell and the trench A adjacent to the single grid cell is a second area, wherein the ratio of the first area to the second area is less than the seepage threshold of the grid cell.
[0076] In one specific implementation, each of the grid cells is a regular hexagon, and the ratio of the first area to the second area is less than 69.8%.
[0077] In one specific implementation, each of the grid cells is an equilateral triangle, and the ratio of the first area to the second area is less than 50%.
[0078] See Figure 2 To facilitate practical operation, this utility model provides a preferred embodiment in which a single grid cell is square and the ratio of the first area to the second area is less than 59%.
[0079] It should be noted that, Figure 2 The following is a top view of the microstructure of a preferred cover plate provided by this utility model. In this preferred embodiment, the thickness of the coating (including bonding layer 24, high refractive layer 22, low refractive layer 23, metal layer 3, and protective layer 4) is too thin relative to the thickness of the texture layer 21, so the coating cannot be displayed when actually photographed under a microscope. This utility model will not be described in detail here, and those skilled in the art should not understand it as a limitation of this utility model.
[0080] In one specific embodiment, the width of the groove A is W, where 1μm ≤ W < 100μm.
[0081] In one specific embodiment, the width of the groove A is W, where 5μm≤W≤20μm.
[0082] In one specific embodiment, the non-conductive detection method is as follows: The resistance of the metal layer 3 is measured using a probe method, specifically within any 2cm x 2cm area of the metal layer 3. Before trenches are created on the metal layer 3, it is conductive and in a continuous state, with a resistance of 0. After trenches are created, the metal layer 3 is divided into at least two grid units, with the gap between two adjacent grid units (i.e., the width of trench A) ≥ 1μm (preferably 5μm-20μm). If the resistance within any 2cm x 2cm area is greater than 100MΩ, then the metal layer 3 is in a non-conductive state.
[0083] In one specific embodiment, the trench A extends through the dielectric layer 2.
[0084] This invention does not impose any special requirements on the preparation method of the cover plate; those in the art can choose according to their needs.
[0085] This invention does not impose any special requirements on the shape of the texture unit; those skilled in the art can select it using conventional techniques.
[0086] This invention does not impose any special requirements on the electroplating conditions, and those skilled in the art can select them according to conventional technical means in the field.
[0087] This invention can effectively solve the problem of poor mobile phone signal while ensuring that the product cover has a metallic texture; and it can avoid the risk of internal components being burned by current when the mobile phone is wirelessly charged.
[0088] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.
Claims
1. A cover plate, characterized in that, The cover plate includes a substrate layer (1), a dielectric layer (2) and a metal layer (3) stacked in sequence. The metal layer (3) has a groove (A) with the groove (A) facing inward and penetrating the metal layer (3) so that the metal layer (3) is non-conductive.
2. The cover plate according to claim 1, characterized in that, The trench (A) divides the metal layer (3) into at least two grid cells. The length L of any two nodes connected in the grid cell is less than (λ / 20), where λ is the wavelength of the antenna signal communication wave.
3. The cover plate according to claim 2, characterized in that, The trench (A) includes multiple transverse trenches and multiple longitudinal trenches, and the transverse trenches and the longitudinal trenches are connected and divide the metal layer (3) into a grid of interwoven transverse and longitudinal trenches, and the grid trenches divide the metal layer (3) into grid units; The transverse trench is defined to extend from one transverse side of the metal layer to the other side, and the longitudinal trench extends from one longitudinal side of the metal layer to the other side.
4. The cover plate according to claim 2, characterized in that, The medium layer (2) includes a texture layer (21), and the texture layer (21) includes a plurality of texture units.
5. The cover plate according to claim 4, characterized in that, Each of the aforementioned mesh cells at least covers a single aforementioned texture cell; And / or, the area of a single texture unit is >10 -4 mm 2 .
6. The cover plate according to claim 2, characterized in that, The area of a single grid cell is a first area, and the sum of the areas of the single grid cell and the trenches (A) adjacent to the single grid cell is a second area. The ratio of the first area to the second area is less than the seepage threshold of the grid cell.
7. The cover plate according to claim 5, characterized in that, Each of the aforementioned grid cells is square, and the ratio of the first area to the second area is less than 59%. Alternatively, a single grid cell may be a regular hexagon, and the ratio of the first area to the second area may be less than 69.8%. Alternatively, a single grid cell may be an equilateral triangle, and the ratio of the first area to the second area may be less than 50%.
8. The cover plate according to claim 1, characterized in that, The width of the groove (A) is W, where 1μm≤W<100μm; And / or, the trench (A) extends through the dielectric layer (2).
9. The cover plate according to any one of claims 1-8, characterized in that, The cover plate also includes a protective layer (4) disposed on the outside of the metal layer (3), and the material of the protective layer (4) has an absorption rate of 50%-80% in the ultraviolet band.
10. The cover plate according to claim 9, characterized in that, The width of the groove (A) is W, where 5μm≤W≤20μm; And / or, the material of the protective layer (4) has an absorption rate of 50%-80% at 315nm-400nm.