Membrane and terminal device
By depositing a silicon carbide layer on the substrate, the problem of reduced adhesion caused by the reaction between the substrate and the silicon dioxide film was solved, achieving a strong bond between the film and the metal shell and excellent optical performance.
Patent Information
- Application Number
- CN202423170042.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-19
AI Technical Summary
When depositing a silicon dioxide film on a substrate with a high carbon content, oxygen readily reacts with the carbon in the substrate, leading to a decrease in the adhesion of the anti-fingerprint film.
The structure consists of a substrate layer, a silicon carbide layer, and a functional layer stacked sequentially. The substrate layer contains carbon elements, and the silicon carbide layer is deposited by material vapor deposition to avoid oxygen reaction and enhance the bonding force.
It improves the bonding force between the diaphragm and the metal housing, enhances the diaphragm's wear resistance, adhesion, and optical properties, and improves the user experience.
Smart Images
Figure CN223786316U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of protection film, especially relates to a diaphragm and terminal device. BACKGROUND
[0002] The surface of the shell of the electronic device is usually plated with an anti-fingerprint film to improve the use effect of the product. To improve the adhesion and durability of the anti-fingerprint film, a layer of silicon dioxide film is usually provided as an intermediate layer between the substrate layer plated on the electronic device and the anti-fingerprint film. However, when plating a silicon dioxide film on a substrate layer with a high carbon content, for example, the carbon content in the substrate layer is as high as 70%, the oxygen element in the silicon dioxide film is prone to react with the carbon element in the substrate layer, resulting in a decrease in the bonding force of the anti-fingerprint film. SUMMARY
[0003] In view of the above, it is necessary to provide a diaphragm and terminal device to improve the bonding force of the diaphragm and the metal shell.
[0004] The diaphragm provided by the embodiments of the present application comprises a substrate layer, a silicon carbide layer and a functional layer which are sequentially stacked, the substrate layer is used to be plated on the outer surface of a metal shell, the upper and lower sides of the silicon carbide layer are connected with the substrate layer and the functional layer respectively, and the substrate layer contains carbon elements.
[0005] In some embodiments, the thickness of the substrate layer ranges from 0.2 μm to 2 μm.
[0006] In some embodiments, the thickness of the silicon carbide layer ranges from 5 nm to 100 nm.
[0007] In some embodiments, the thickness of the functional layer ranges from 5 nm to 30 nm.
[0008] In some embodiments, the diaphragm is provided with a hollow part, and the hollow part penetrates through the substrate layer, the silicon carbide layer and the functional layer.
[0009] In some embodiments, the material of the substrate layer is one of chromium carbonitride, titanium carbonitride and chromium carbide.
[0010] In some embodiments, the diaphragm further comprises a protective layer, the protective layer is arranged on the side of the functional layer away from the silicon carbide layer, and the protective layer is used to protect the functional layer.
[0011] In some embodiments, the material of the protective layer is polyethylene terephthalate.
[0012] The embodiments of the present application also provide a terminal device, which comprises:
[0013] a metal shell; and a diaphragm.
[0014] The aforementioned diaphragm is deposited on the outer surface of the metal housing, and the base layer is connected to the outer surface of the metal housing.
[0015] In some embodiments, the side of the diaphragm extends to the periphery of the metal housing.
[0016] In the aforementioned membrane, the base layer is connected to the functional layer through a silicon carbide layer. Since the silicon carbide layer does not contain oxygen, the carbon element in the base layer is prevented from reacting with the elements contained in the silicon carbide layer, thus ensuring the bonding force between the membrane and the metal shell. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the terminal device provided in the embodiments of this application.
[0018] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the terminal device along the II-II direction.
[0019] Figure 3 for Figure 2 The image shows the surface microstructure of the membrane.
[0020] Figure 4 for Figure 2 The diagram shows a schematic of the optical constant curve of the diaphragm.
[0021] Figure 5 for Figure 2 The diagram shows the color difference curve of the film.
[0022] Explanation of symbols for main components: diaphragm 100, substrate 10, silicon carbide layer 20, functional layer 30, perforated part 40, protective layer 50, terminal device 200, metal shell 201. Detailed Implementation
[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0024] In the description of the present application, it needs to be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or components indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, it needs to be explained that the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.
[0025] In the description of the present application, it needs to be explained that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other, it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal communication of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.
[0026] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0027] Referring to Figure 1 , the present application provides a terminal device 200, which comprises a metal shell 201 and a diaphragm 100, the diaphragm 100 covers the upper surface of the metal shell 201. Exemplarily, the terminal device 200 can be a mobile phone, a watch, a tablet computer and the like.
[0028] Referring to Figure 1 and Figure 2 , the diaphragm 100 comprises a substrate layer 10, a silicon carbide layer 20 and a functional layer 30 which are sequentially stacked, the substrate layer 10 is plated on the outer surface of the metal shell 201, the upper and lower sides of the silicon carbide layer 20 are connected with the substrate layer 10 and the functional layer 30 respectively, and the substrate layer 10 has carbon elements.
[0029] In this way, the substrate layer 10 in the diaphragm 100 described above is connected to the functional layer 30 through the silicon carbide layer 20, since the silicon carbide layer 20 does not contain oxygen elements, the reaction between the carbon elements in the substrate layer 10 and the elements contained in the silicon carbide layer 20 is avoided, and the bonding force of the diaphragm 100 is ensured.
[0030] Referring to Figure 3 , Figure 3For the scanning electron microscope (SEM) image showing the surface microstructure of the diaphragm 100, it can be seen from the figure that the surface structure of the silicon carbide layer 20 is tight without large gaps, apertures, etc., which can make the surface of the silicon carbide layer 20 have the characteristics of good bonding force and strong density. Please refer to Figure 4 , Figure 4 The figure shows the optical constant curve obtained by testing the diaphragm 100, from which it can be seen that the refractive index and extinction coefficient of the silicon carbide layer 20 change at different wavelengths, and then the silicon carbide layer 20 has better refractive index and extinction coefficient. Please refer to Figure 5 , Figure 5 The figure shows the color difference curve obtained by testing the diaphragm 100, from which it can be seen that the change of the silicon carbide layer 20 with different thicknesses in a and b values, by adjusting the thickness and element ratio of the silicon carbide layer 20 to adjust the interference effect, and then adjust the color difference to meet the different use requirements of the diaphragm 100. Among them, Figure 5 The change of a value in the above is usually related to red-green color, Figure 5 The change of b value in the above is usually related to yellow-blue color.
[0031] In this embodiment, the substrate layer 10 and the silicon carbide layer 20 are plated by material vapor deposition method. The material vapor deposition method here is a technology for forming a thin film on the surface of a material, which includes physical vapor deposition (PVD) and chemical vapor deposition (CVD): physical vapor deposition is a technology for vaporizing materials into atoms, molecules or ions under vacuum conditions by physical methods, and depositing a thin film on the surface of the material through a gas phase process. The main methods of PVD include vacuum evaporation, sputtering plating, ion plating, etc.; chemical vapor deposition is a method for forming a metal or compound thin film on the surface of a substrate by the interaction of mixed gas and the surface of the substrate at a certain temperature. Specifically, when plating the silicon carbide layer 20, Ar is ionized into Ar+ ions and bombards the Si target to sputter Si particles in the plating cavity, and the introduced acetylene gas is ionized to generate C+ ions, and Si and C react to form a silicon carbide layer deposited on the substrate layer 10. The process parameters for plating the silicon carbide layer 20 include argon flow rate of 150-600 sccm, acetylene flow rate of 10-20 sccm, bias voltage of 50-200 V, duty cycle of 30%-70%, temperature of 80-140℃, and Si target current of 4-12 A.
[0032] In some embodiments, the functional layer 30 is an anti-fingerprint film (AF film) plated by evaporation, and the main component of the functional layer 30 is fluorine-containing resin. The functional layer 30 can avoid the terminal device 200 from sticking fingerprints, thereby improving user experience.
[0033] In some embodiments, the thickness of the base layer 10 ranges from 0.2 μm to 2 μm.
[0034] When the thickness of the base layer 10 is less than 0.2 μm, the abrasion resistance of the membrane 100 is reduced due to the reduced thickness of the base layer 10, and the base layer 10 cannot provide sufficient adhesion, resulting in poor adhesion of the silicon carbide layer 20 and the functional layer 30. When the thickness of the base layer 10 is greater than 2 μm, the amount of material used for the base layer 10 increases, increasing the production cost, and the excessively thick base layer 10 also affects the optical performance of the membrane 100, such as the transmittance and reflectance. Therefore, by setting the thickness of the base layer 10 to range from 0.2 μm to 2 μm, the base layer 10 can provide sufficient adhesion and abrasion resistance, which is conducive to the stable adhesion of the silicon carbide layer 20 and the functional layer 30, and is conducive to ensuring the optical performance of the membrane 100, without negatively affecting the optical performance of the membrane 100.
[0035] In some embodiments, the thickness of the silicon carbide layer 20 ranges from 5 nm to 100 nm.
[0036] When the thickness of the silicon carbide layer 20 is less than 5 nm, the silicon carbide layer 20 cannot form sufficient interfacial bonding, resulting in insufficient adhesion between the base layer 10 and the functional layer 30, and the silicon carbide layer 20 cannot effectively buffer the thermal expansion or mechanical stress between the base layer 10 and the functional layer 30, increasing the risk of cracking or delamination of the membrane 100. When the thickness of the silicon carbide layer 20 is greater than 100 nm, the excessively thick silicon carbide layer 20 can increase light scattering and absorption, affecting the transparency and optical performance of the membrane 100, and can reduce the thermal conductivity of the membrane 100, affecting its heat dissipation performance. Therefore, by setting the thickness of the silicon carbide layer 20 to range from 5 nm to 100 nm, the silicon carbide layer 20 can form good interfacial bonding, enhance the adhesion between the base layer 10 and the functional layer 30, and effectively buffer the thermal expansion or mechanical stress between the base layer 10 and the functional layer 30, in addition to ensuring the transparency, optical performance, and heat dissipation performance of the membrane 100.
[0037] In some embodiments, the thickness of the functional layer 30 ranges from 5 nm to 30 nm.
[0038] When the thickness of the functional layer 30 is less than 5 nm, the functional layer 30 is too thin and may not be able to withstand friction and impact in daily use, resulting in reduced durability of the membrane 100. When the thickness of the functional layer 30 is greater than 30 nm, the excessively thick functional layer 30 affects the optical transparency of the membrane 100. Therefore, by setting the thickness of the functional layer 30 to range from 5 nm to 30 nm, the durability and optical transparency of the membrane 100 can be ensured.
[0039] Please refer to Figure 3In some embodiments, the diaphragm 100 is provided with a hollow part 40, which penetrates the base layer 10, the silicon carbide layer 20 and the functional layer 30.
[0040] In this way, since the terminal device 200 is provided with a volume hole, a camera and other structures, the hollow part 40 is arranged to avoid the above-mentioned structures, so as to avoid the diaphragm 100 from shielding the structures, which is beneficial to improve the experience effect of the user.
[0041] In some embodiments, the material of the base layer 10 is one of chromium carbonitride, titanium carbonitride and chromium carbide.
[0042] In this way, by setting the material of the base layer 10 as one of chromium carbonitride, titanium carbonitride and chromium carbide, the base layer 10 has the characteristics of high hardness, good wear resistance and excellent corrosion resistance, which helps to enhance the durability and reliability of the diaphragm 100.
[0043] Please refer to Figure 1 In some embodiments, the diaphragm 100 further comprises a protective layer 50, which is arranged on the side of the functional layer 30 away from the silicon carbide layer 20, and the protective layer 50 is used to protect the functional layer 30. Specifically, the material of the protective layer 50 is polyethylene terephthalate.
[0044] By setting the protective layer 50, the good mechanical properties and impact strength of the protective layer 50 can effectively protect the functional layer 30 and the metal shell 201.
[0045] In some embodiments, the side edge of the diaphragm 100 extends to the circumferential side of the metal shell 201.
[0046] Since the circumferential side of the metal shell 201 is arc-shaped and connected to the outer surface of the metal shell 201, such as a curved screen of a mobile phone, a watch head of an electronic watch and the like, in this way, by setting the side edge of the diaphragm 100 to extend to the circumferential side of the metal shell 201, the metal shell 201 can be completely covered, thereby effectively protecting the metal shell 201.
[0047] Specifically, the mechanical properties of the diaphragm 100 provided in the embodiments of the present application are tested, and the specific results are shown in Table 1.
[0048] Table 1: Mechanical property test statistics table
[0049]
[0050] From the contents in Table 1, the first test item evaluates the adhesion of the film layer in the strip area, and the test specification requires the adhesion of the film layer to reach 4B or higher. The result shows 5B / 5B / 5B, which means that the film sheet 100 reaches the high adhesion level of 5B at three test points, and the test is determined to pass. The second test item evaluates the adhesion of the film layer in the spot area, and the test evaluation is similar to the strip area. The test specification requires the adhesion of the film layer to reach 4B or higher. The result shows 5B / 5B / 5B, which means that the film sheet 100 reaches the high adhesion level of 5B at three test points, and the test is determined to pass. The third test item evaluates the interlayer peeling performance of the film layer, and the test specification requires that the peeling area does not exceed 10000 square microns in a 2x2 square inch area. The result shows OF / 10, which means that no peeling is found in 10 test samples, and the test is determined to pass. The fourth test item evaluates the crack resistance of the film layer when impacted. The test specification requires that the film layer does not appear "spider web" cracks in the impact test. The result shows OF / 2pcs, which means that no cracks are found in two test samples, and the test is determined to pass. The fifth test item evaluates the impact resistance of the film layer when impacted like granite. The test specification requires that the impact resistance level of the film layer reaches CAT3 or higher. The result shows CAT5 / CAT5, which means that both test samples reach the high impact resistance level of CAT5, and the test is determined to pass.
[0051] Therefore, from the test results of the first and second test items, it can be known that the combination between the film sheet 100 and the metal shell 201 is very firm and not easy to peel or fall off. From the test result of the third test item, it can be known that the peeling area of the film sheet 100 is far below the specification requirement of 10000 square microns, and the test result shows no peeling, which means that the film sheet 100 can remain intact and not easy to delaminate when subjected to peeling force. From the test result of the fourth test item, it can be known that the film sheet 100 does not appear "spider web" cracks in the impact test, which means that the film sheet 100 has good impact resistance and can resist external impact without cracks. From the test result of the fifth test item, it can be known that the film sheet 100 reaches the impact resistance level of CAT5, which is the highest level in this test, which means that the film sheet 100 has very high resistance when impacted like granite. Therefore, from the above analysis and test results, it can be known that the film sheet 100 performs comprehensively in mechanical properties, and has good adhesion, anti-peeling, impact resistance and crack resistance, which can meet the high-standard application requirements.
[0052] Specifically, the water drop angle of the test samples and the comparative samples of the embodiments of the present application is tested, and the specific results are shown in Table 2. Among them, the water drop angle is used to measure the size of the contact angle between the liquid drop and the solid surface, so as to reflect the cleanliness, wettability and performance of the coating of the material surface.
[0053] Table 2: Test result statistics table of water drop angle
[0054]
[0055] Test samples 1-5 in Table 2 are all the film sheets 100 provided by the present application, and the base layer 10 and the functional layer 30 are connected by the silicon carbide layer 20. Comparative samples 1-5 are test films, and comparative samples 1-5 all include a first film layer, a second film layer and a third film layer which are sequentially stacked. The first film layer and the third film layer are the same as the base layer 10 and the functional layer 30 of the present application, and the second film layer is a silicon dioxide layer. The first film layer and the third film layer are connected through the silicon dioxide layer. In this way, by comparing the measurement results of the water drop angles of test samples 1-5 and corresponding comparative samples 1-5 under different friction times, the water repellency of the surface of test samples 1-8 and corresponding comparative samples 1-5 is reflected.
[0056] From the content of Table 2, it can be seen that when test samples 1-5 are tested, no matter how many times of friction, the test results of the water drop angle are kept between 114.6° and 118.47°, indicating that the performance of the test sample is good. When comparative samples 1-5 are tested, when the initial friction times is 0, the water drop angle is between 118.4° and 119.2°, which is good; when the friction times increases to 500 times, the water drop angle decreases slightly, but still remains above 116°; when the friction times increases to 1000 times, the water drop angle decreases slightly, but still remains above 115.4°; when the friction times increases to 3000 times, the water drop angle decreases to 113.1°, indicating that the performance decreases; when the friction times increases to 6000 times, the water drop angle further decreases to 109.8°, indicating that the performance decreases.
[0057] In this way, from the content and specific analysis of Table 2, it can be seen that the water drop angle of test samples 1-5 of the film sheet 100 changes little after different times of friction, which indicates that the film sheet 100 has good surface stability and durability. In addition, after multiple times of friction, the water drop angle of the film sheet 100 still remains at a high degree, and the film sheet 100 has good anti-fingerprint, anti-fouling performance and wear resistance, because a high water drop angle is usually related to the film body surface not easy to be stained with fingerprints and dirt.
[0058] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. A diaphragm, characterized by The diaphragm comprises a substrate layer, a silicon carbide layer and a functional layer which are sequentially stacked, the substrate layer is used for plating on the outer surface of a metal shell, the upper and lower sides of the silicon carbide layer are connected with the substrate layer and the functional layer respectively, and the substrate layer has carbon elements.
2. The membrane of claim 1, wherein, The thickness of the substrate layer ranges from 0.2 μm to 2 μm.
3. The membrane of claim 1, wherein, The thickness of the silicon carbide layer ranges from 5 nm to 100 nm.
4. The membrane of claim 1, wherein, The thickness of the functional layer ranges from 5 nm to 30 nm.
5. The membrane of claim 1, wherein, The diaphragm is provided with a hollow part which penetrates through the substrate layer, the silicon carbide layer and the functional layer.
6. The membrane of claim 1, wherein, The material of the substrate layer is one of chromium carbonitride, titanium carbonitride and chromium carbide.
7. The membrane of claim 1, wherein, The diaphragm further comprises a protective layer which is arranged on the side of the functional layer away from the silicon carbide layer, and the protective layer is used for protecting the functional layer.
8. The membrane of claim 7, wherein, The material of the protective layer is polyethylene terephthalate.
9. A terminal device, characterized by comprising: The diaphragm comprises: a metal shell; and The diaphragm is plated on the outer surface of the metal shell, and the substrate layer is connected with the outer surface of the metal shell.
10. The terminal device of claim 9, wherein, The side edge of the diaphragm extends to the circumferential side of the metal shell.