Electronic device housing assembly and electronic device

Abstract

The application provides an electronic device shell assembly, comprising: a base material, a surface of the base material comprising a first region and a second region connected to each other; the first region is provided with a first paint layer, a surface of the first paint layer having a loop-shaped texture structure formed by a plurality of micron-level wrinkles; the second region is provided with a second paint layer, a gloss of the surface of the second paint layer being different from a gloss of the surface of the first paint layer. The application also provides a preparation method of the electronic device shell assembly and an electronic device comprising the same. The first paint layer with a surface having a loop-shaped texture structure formed by a plurality of micron-level wrinkles is used as a matte layer, and a specific forming mode thereof can enable the second paint layer to be cured at the same time, so that the electronic device shell assembly surface presents different appearance effects, and meanwhile, a step difference between the two is small or does not exist, and the two do not diffuse to each other to cause unclear boundaries, thereby affecting the product appearance.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to an electronic device housing assembly and an electronic device. Background Technology

[0002] With the increasing variety of computer, communication, and consumer electronics (3C products), consumers have more demands for the appearance of electronic products. For example, they may use different material splicing schemes as the appearance, or use the same material but different processes to make spliced ​​appearances, or make appearances with the same light and different colors, or the same gloss and matte finish. Summary of the Invention

[0003] Based on this, this application provides an electronic device housing assembly and an electronic device. The surface of the electronic device housing assembly provided by this application can achieve different gloss levels on the surface of the electronic device housing, ensuring the consistency between glossy and matte surfaces or matte and ultra-matte surfaces, and there is no step difference at the splicing of different appearance effects.

[0004] This application provides an electronic device housing assembly, including:

[0005] The substrate, the surface of which includes a first region and a second region that are interconnected;

[0006] The first region is provided with a first paint layer, and the surface of the first paint layer has a loop-like texture structure formed by multiple micron-level folds;

[0007] The second region is provided with a second paint layer, and the gloss of the surface of the second paint layer is different from that of the surface of the first paint layer.

[0008] This application uses a first paint layer with a loop-like textured structure formed by multiple micron-level folds as a matte layer. Its specific formation method allows the second paint layer to cure simultaneously, resulting in minimal or no difference in the surface area between the two layers, preventing cross-diffusion and unclear boundaries that would affect the product's appearance. Furthermore, the different gloss levels of the first paint layer 1021 and the second paint layer 1022 create different visual effects on the surface of the electronic device housing assembly, achieving aesthetic diversity. Additionally, the loop-like textured structure formed by multiple micron-level folds on the surface of the first paint layer provides a skin-friendly feel, enhancing the user experience.

[0009] In some specific implementations, the gloss of the second paint layer can be higher than that of the first paint layer, forming a combination of high gloss, gloss, semi-gloss, or matte finishes, or a combination of different matte finishes to achieve a variety of appearances.

[0010] In some specific implementations, the second paint layer and the first paint layer have the same thickness, and there is no step difference at the joint between them, so there will be no problem of scratching your hands, and it is more aesthetically pleasing.

[0011] In some specific implementations, the first paint layer is formed from an excimer paint composition comprising: 30 wt% to 40 wt% of an excimer resin; 15 wt% to 25 wt% of a UV high-functionality resin; 5 wt% to 10 wt% of a yellowing-resistant resin; 4 wt% to 8 wt% of a UV monomer; 1 wt% to 3 wt% of a photoinitiator; 10 wt% to 20 wt% of a solvent; 1 wt% to 3 wt% of additives; and 3 wt% to 6 wt% of a matting agent. The first paint layer formed from the above excimer paint composition has a low gloss, exhibiting a matte effect, and has good adhesion to the substrate.

[0012] In some specific implementations, the second paint layer is formed from a varnish composition comprising: 20 wt% to 35 wt% of a UV high-functionality resin; 10 wt% to 25 wt% of a UV low-functionality resin; 1 wt% to 5 wt% of a UV monomer; 2 wt% to 4 wt% of a photoinitiator; 1 wt% to 3 wt% of a leveling agent; 20 wt% to 30 wt% of a solvent; and 0 to 1 wt% of additives. The varnish composition is a high-gloss topcoat, which contrasts sharply with the first paint layer and provides a good appearance.

[0013] This application also provides a method for manufacturing the above-mentioned electronic device housing assembly, comprising the following steps:

[0014] A substrate is provided, the surface of which includes a first region and a second region that are interconnected.

[0015] An excimer paint composition is applied to a first region of the substrate, and a varnish composition is applied to a second region of the substrate.

[0016] After leveling the excimer paint composition and varnish composition, an energy of 1000 mJ / cm was applied. 2 ~2000mj / cm 2 The first curing was performed using LEDs with wavelengths of 395nm to 445nm, followed by curing with an energy of 400mJ / cm². 2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm, followed by a final curing process with an energy of 800mJ / cm². 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm to form the first and second paint layers, respectively.

[0017] This application utilizes the characteristics of excimer resin paint compositions that only undergo surface curing under excimer lamps, forming multiple micron-level wrinkles, and subsequently fully curing into a film, and the characteristics of clear varnish compositions that do not cure under excimer lamps, and the fact that the two do not diffuse into each other. The excimer paint composition and clear varnish composition are respectively coated on the first and second regions of the substrate, forming paint films with different gloss levels under the same curing conditions, thereby obtaining electronic device housing components with different surface effects, such as a combination of gloss and matte or different matte finishes. This process is not only simple and time-saving, but also ensures that the difference in gloss level between paint films with different gloss levels is small or non-existent. At the same time, the excimer paint composition and clear varnish composition do not diffuse into each other, which can avoid the splicing seams being crooked or blurred, ensuring that the electronic device housing components have a better appearance.

[0018] This application also provides an electronic device, including the electronic device housing assembly described in the above-described technical solution. The electronic device housing assembly described in the above-described technical solution has a surface coating film with small or no step differences and varying gloss levels, and the seams are clear, resulting in a good appearance. Simultaneously, the first coating layer, having a loop-like texture structure formed by multiple micron-level folds, has a skin-friendly feel, enhancing the user experience of the electronic device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the process of achieving a surface with both gloss and matte finish using a combination of spraying and laser engraving.

[0020] Figure 2 This is a schematic diagram illustrating the process of achieving a surface with both gloss and matte finishes using a batch spraying method.

[0021] Figure 3 This is a schematic diagram illustrating the process of achieving a surface with both gloss and matte finishes using a combination of masking spraying and simultaneous curing.

[0022] Figure 4 This is a schematic diagram of the structure of an electronic device in one embodiment of this application;

[0023] Figure 5 A schematic diagram of the structure of the electronic device housing assembly provided in this application;

[0024] Figure 6 Photographs of the electronic device housing assembly provided in this application;

[0025] Figure 7 Low-magnification electron microscope images of the electronic device housing assembly provided in this application;

[0026] Figure 8 High-magnification electron microscope images of the electronic device housing assembly provided in this application;

[0027] Figure 9 This is an electron microscope image of the first paint layer;

[0028] Figure 10 This is an electron microscope image of the second paint layer;

[0029] Figure 11 This is a schematic diagram of the surface structure of the first paint layer provided in an embodiment of this application;

[0030] Figure 12 This is a schematic diagram of the stacked structure of an electronic device housing assembly provided in another embodiment of this application;

[0031] Figure 13 A process flow diagram for the fabrication of the electronic device housing assembly provided in this application. Detailed Implementation

[0032] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0033] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," etc., mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] For 3C products, a combination of spraying and laser engraving is generally used to achieve a surface finish that is both glossy and matte. (See [link / reference]) Figure 1 , Figure 1 This is a schematic diagram illustrating the process of achieving a matte / gloss surface using a combination of spraying and laser engraving. The main process involves first spraying a high-gloss topcoat 12 onto the entire surface of the substrate 11, then using laser engraving to create a matte surface 14 in specific areas 13, thus forming a matte / gloss surface. However, this method is too time-consuming and costly for products with large surface areas. Batch spraying is another method for obtaining a matte / gloss surface; see [link to relevant documentation]. Figure 2 , Figure 2 The schematic diagram illustrates the process of achieving a glossy and matte finish on the surface using a batch spraying method. First, the first area 21 of the substrate surface is masked. Then, the first topcoat 23 is sprayed and cured on the second area 22 of the substrate surface. Next, the first topcoat 23 is masked, and the second topcoat 24 is sprayed and cured on the first area 21 of the substrate surface. The first topcoat 23 and the second topcoat 24 are opposite to each other, being glossy and matte respectively. However, this method can easily lead to a difference in the joint between the first topcoat 23 and the second topcoat 24, which may cause problems such as scratching the hand.

[0035] The applicant discovered in their research that a method combining masking spraying and simultaneous curing can be used to prepare a surface that is both glossy and matte. (See [link to relevant documentation]). Figure 3 , Figure 3 The schematic diagram illustrates the process of achieving a glossy and matte finish on the surface by using a combination of masking spraying and simultaneous curing. First, the first area 31 of the substrate surface is masked. Then, the first topcoat 33 is sprayed onto the second area 32 of the substrate surface. Next, the first topcoat 33 is masked, and the second topcoat 34 is sprayed onto the first area 31 of the substrate surface. At the same time, the first topcoat 33 and the second topcoat 34 are cured. The first topcoat 33 and the second topcoat 34 are opposite to each other, being glossy and matte paints. However, in this scheme, the matte powder in the matte paint will diffuse towards the glossy paint side, causing appearance defects such as blurred splicing boundaries and unevenness.

[0036] Based on this, one embodiment of this application provides an electronic device housing assembly, including:

[0037] The substrate, the surface of which includes a first region and a second region that are interconnected;

[0038] The first region is provided with a first paint layer, and the surface of the first paint layer has a loop-like texture structure formed by multiple micron-level folds;

[0039] The second region is provided with a second paint layer, and the gloss of the surface of the second paint layer is higher than that of the surface of the first paint layer.

[0040] The electronic device described in this application can be any device with communication and storage functions, such as smartphones, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, tablets, Personal Digital Assistants (PADs), laptops, digital cameras, e-book readers, portable multimedia players, handheld devices with wireless communication functions, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, 5G terminal devices, etc. The embodiments of this application are not limited to this.

[0041] This application uses a smartphone as an example for illustration; see [link / reference]. Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device according to one embodiment of this application. In one embodiment, the electronic device 10 includes a mid-frame 100, a display screen 200, and a battery cover 300. The mid-frame 100 connects the display screen 200 and the battery cover 300 respectively, forming a receiving space. The motherboard, memory, power supply, and other components of the electronic device 10 are disposed within the receiving space. The mid-frame 100 and the battery cover 300 constitute the appearance of a smartphone, which is the housing assembly described in the following embodiments. Those skilled in the art will understand that the housing assembly described in the following embodiments can be a mid-frame, a battery cover, or, when the mid-frame and battery cover are integrated, the housing assembly is a mid-frame and a battery cover.

[0042] See Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , Figure 5 This is a structural schematic diagram of the electronic device housing assembly provided in this application. Figure 6 Photographs of the electronic device housing assembly provided in this application. Figure 7 These are low-magnification electron microscope images of the electronic device housing assembly provided in this application. Figure 8 High-magnification electron microscope images of the electronic device housing assembly provided in this application. Figure 9 This is an electron microscope image of the first paint layer. Figure 10 The image shows an electron microscope image of the second paint layer, where 101 is the substrate, 1021 is the first paint layer, and 1022 is the second paint layer.

[0043] The electronic device housing assembly includes a substrate 101, which is the main structure constituting the electronic device housing assembly. Its material includes, but is not limited to, metal, resin or resin composite material, etc. This application does not have any special significance for it, and it can be used to manufacture electronic device housings.

[0044] The surface of the substrate 101 includes a first region and a second region that are interconnected. The first region is provided with a first paint layer, and the second region is provided with a second paint layer. This application does not impose any special limitations on the shape, size, etc., of the first and second regions, and they can be designed according to the requirements of the electronic device housing assembly. The first and second regions are interconnected and together constitute the surface of the electronic housing. The surface of the first region is provided with a first paint layer 1021, and the surface of the second region is provided with a second paint layer 1022. Those skilled in the art will understand that the first paint layer 1021 and the second paint layer 1022 are interconnected.

[0045] In this application, the first paint layer 1021 and the second paint layer 1022 have different gloss levels, which makes the surface of the electronic device housing assembly present different appearance effects, thus achieving appearance diversity. Those skilled in the art will understand that the gloss of a paint film is related to its appearance. For example, when the gloss is >85, the paint film can be called a high-gloss paint film. Its surface is as smooth as a mirror, reflecting light and making it look bright and dazzling, with good decorative and aesthetic properties. When the gloss is 61-85, the paint film can be called a glossy paint film. Its surface has a certain gloss, but it is slightly softer than high gloss, giving the paint film a fresh and bright effect, with certain decorative and aesthetic properties. When the gloss is 31-60, the paint film can be called a semi-gloss paint film. Its gloss is between glossy and matte, giving the paint film a soft and elegant feeling. When the gloss is 16-30, the paint film can be called matte. Its surface has a slight gloss, but it is not dazzling, presenting a soft and warm luster. When the gloss is 0-15, the paint film is called matte. Its surface has almost no gloss, presenting a hazy appearance and not reflecting light.

[0046] In this application, the first paint layer 1021 and the second paint layer 1022 have different gloss levels, specifically, they can reach different degrees as described above, so that the surface of the electronic device housing assembly presents different appearance effects. For example, it can be a combination of high gloss and matte, a combination of gloss and matte, a combination of flat gloss and matte, or a combination of matte with different degrees of matte, presenting two different appearance effects.

[0047] In some specific implementations, the surface of the first paint layer 1021 has a loop-like texture structure formed by multiple micron-level folds, see [link to relevant documentation]. Figure 11 , Figure 11 This is a schematic diagram of the surface structure of the first paint layer provided in an embodiment of this application. It has multiple micron-level wrinkles, each wrinkle forming a loop-like texture structure. In some specific implementations, the height of each wrinkle is determined by the thickness of the first paint layer, generally ranging from 10 μm to 30 μm, and the center-to-center distance between adjacent wrinkles is preferably 5 μm to 15 μm. The first paint layer 1021, having a loop-like texture structure formed by multiple micron-level wrinkles, has a low gloss level, exhibiting a matte effect.

[0048] In some specific implementations, the gloss of the surface of the second paint layer 1022 is different from that of the surface of the first paint layer. As mentioned above, the gloss of the surface of the second paint layer 1022 can be much higher than that of the surface of the first paint layer 1021, forming a combination of high gloss, gloss, semi-gloss, or matte finishes; the gloss of the surface of the second paint layer 1022 can be slightly higher than that of the surface of the first paint layer 1021, forming a combination of different matte finishes. This application does not impose any special restrictions on this.

[0049] In some specific implementations, the first paint layer 1021 and the second paint layer 1022 have the same thickness, meaning there is no difference in thickness between them, thus avoiding problems such as scratching the hands. This application selects a first paint layer with a loop-like texture structure formed by multiple micron-level folds as the matte layer. Its specific formation method allows the second paint layer to cure simultaneously with it, eliminating any difference in thickness between them and preventing cross-diffusion that could lead to unclear boundaries and affect the product's appearance. In some specific implementations, the thickness of the first and second paint layers is 15μm to 50μm, preferably 20μm to 45μm, and more preferably 25μm to 40μm.

[0050] In some specific implementations, the first paint layer 1021 is formed by curing an excimer paint composition. The excimer paint composition refers to a composition that can be surface-cured under excimer lamp irradiation to form multiple micron-level wrinkles, creating a loop-like texture structure, and then cured again to achieve complete curing of the composition. This application does not impose any special limitations on the excimer paint composition. However, for better adhesion to the substrate used in electronic device housing components, the excimer paint composition preferably includes:

[0051] 30wt% to 40wt% excimer resin;

[0052] 15wt%–25% UV-functionalized resin;

[0053] 5wt% to 10wt% of yellowing-resistant resin;

[0054] 4wt% to 8wt% of UV monomers;

[0055] 1 wt% to 3 wt% of photoinitiator;

[0056] 10wt% to 20wt% of solvent;

[0057] 1wt% to 3wt% of additives;

[0058] 3wt% to 6wt% matting agent.

[0059] The excimer paint composition includes 30wt% to 40wt% of excimer resin, which is a resin that can be cured under excimer lamp irradiation to form wrinkles. This application does not have any special limitations on the excimer resin, including but not limited to aliphatic polyesters.

[0060] The excimer paint composition comprises 15 wt% to 25% of a UV high-functionality resin. This UV high-functionality resin can be cured under ultraviolet light, providing the paint layer with the required properties, such as hardness and abrasion resistance. Those skilled in the art will understand that the UV high-functionality resin described in this application is a resin with a functionality of 6 or higher. This application does not impose any special limitations on the UV high-functionality resin; any commercially available resin with the aforementioned functions is acceptable.

[0061] The excimer paint composition includes 5 wt% to 10 wt% of a yellowing-resistant resin, which is used to improve the yellowing resistance of the paint film. In some specific implementations, the yellowing-resistant resin is a resin with a functionality of 2 to 3. This application does not impose any particular limitation on the yellowing-resistant resin; commercially available resins with the above-mentioned functions are acceptable.

[0062] The excimer paint composition comprises 4 wt% to 8 wt% of UV monomers. These UV monomers can improve the leveling properties and toughness of the composition, and increase the crosslinking density of the paint film. This application does not impose any particular limitation on the UV monomers; commercially available polymerizable monomers with the aforementioned functions are acceptable.

[0063] The excimer paint composition includes 1 wt% to 3 wt% of a photoinitiator, which is used to initiate resin polymerization and crosslinking, thereby curing the resin to form a paint film. This application does not impose any particular limitation on the photoinitiator; it can be selected based on the photopolymerization groups in each resin.

[0064] The excimer paint composition includes 10wt% to 20wt% solvent for dissolving the resin to form a solution. This application does not impose any particular limitation on the solvent, as long as it is capable of dissolving the corresponding raw materials.

[0065] The excimer paint composition includes 1 wt% to 3 wt% of additives, which are used to improve the performance of the paint film, including but not limited to additives that improve the feel, leveling agents, ultraviolet light absorbers, etc. This application does not impose any special restrictions on the types and specific components of the additives, and those skilled in the art can select them as needed.

[0066] The excimer paint composition includes 3wt% to 6wt% of matting powder. The matting powder has the functions of facilitating curing and film formation, facilitating construction, improving the thixotropic effect of the paint film, preventing sagging, and preventing glossy edges. This application does not impose any special restrictions on the type of matting powder, and those skilled in the art can select it as needed.

[0067] The excimer paint composition provided in this application can form multiple micron-level wrinkles under excimer curing conditions, thereby forming a loop-like texture structure with low gloss, presenting a matte finish, and having a good tactile feel, which can improve the user experience of electronic device housing components.

[0068] Specifically, the excimer paint composition can be cured under the following conditions:

[0069] Using an energy of 1000 mJ / cm 2 ~2000mj / cm 2 The first curing was performed using LEDs with wavelengths of 395nm to 445nm, followed by curing with an energy of 400mJ / cm². 2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm, followed by a final curing process with an energy of 800mJ / cm². 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm.

[0070] In some specific implementations, the second paint layer 1022 is formed by curing a clear varnish composition, which can be a high-gloss topcoat; this application does not have any particular limitation on this. In some specific implementations, the clear varnish composition includes:

[0071] 20wt%–35wt% UV-functionalized resin;

[0072] 10wt% to 25wt% of UV low-functional resin;

[0073] 1wt% to 5wt% of UV monomers;

[0074] 2wt%–4wt% of photoinitiator;

[0075] 1wt% to 3wt% leveling agent;

[0076] 20wt% to 30wt% of solvent;

[0077] 0-1 wt% of additives.

[0078] The varnish composition is a high-gloss topcoat, which contrasts sharply with the first paint layer and has a good appearance. The varnish composition includes 20wt% to 35wt% of a UV-curable high-functionality resin. This UV-curable resin can be cured under ultraviolet light, providing the paint layer with the required properties, such as hardness and abrasion resistance. Those skilled in the art will understand that the UV-curable high-functionality resin described in this application is a resin with a functionality of 6 or higher. This application does not impose any special limitations on the UV-curable high-functionality resin; any commercially available resin with the aforementioned functions is acceptable.

[0079] The varnish composition includes 10 wt% to 25 wt% of a UV low-functionality resin, which is used to adjust the toughness, hardness, and other properties of the coating film. In some specific implementations, the UV low-functionality resin is a resin with a functionality of 2 to 3. This application does not impose any special limitations on the UV low-functionality resin; any commercially available resin with the above-mentioned functions is acceptable.

[0080] The varnish composition includes 1 wt% to 5 wt% of UV monomers, which can improve the leveling properties, toughness, adhesion, and other properties of the composition. This application does not impose any special limitations on the UV monomers; commercially available polymerizable monomers with the aforementioned functions are acceptable.

[0081] The varnish composition includes 2 wt% to 4 wt% of a photoinitiator, which is used to initiate resin polymerization and crosslinking, thereby curing the resin to form a varnish film. This application does not impose any particular limitation on the photoinitiator; it can be selected based on the photopolymerization groups in each resin.

[0082] The varnish composition includes 20wt% to 30wt% solvent for dissolving the resin to form a solution. This application does not impose any particular limitation on the solvent, as long as it is capable of dissolving the corresponding raw materials.

[0083] The varnish composition includes 1 wt% to 3 wt% of a leveling agent for adjusting the wetting and leveling properties of the solution. This application does not impose any particular limitation on the leveling agent; it can be one or more commonly used leveling agents. When multiple leveling agents are used, this application does not impose any particular limitation on the selection of the leveling agents or their relative amounts.

[0084] The varnish composition includes 0 wt% to 1 wt% of additives, which are used to improve the performance of the paint film, including but not limited to additives that improve the feel and ultraviolet light absorbers. This application does not impose any special restrictions on the types and specific components of the additives, and those skilled in the art can select them as needed.

[0085] The varnish composition provided in this application does not cure under excimer curing conditions, but cures into a film during the subsequent curing process, forming a high-gloss varnish film that exhibits a high-gloss state, thereby forming a glossy and matte appearance structure.

[0086] To simplify the preparation process, the varnish composition and the excimer resin composition are cured simultaneously; that is, the varnish composition can also be cured using the following method:

[0087] Using an energy of 1000 mJ / cm 2 ~2000mj / cm 2 The first curing was performed using LEDs with wavelengths of 395nm to 445nm, followed by curing with an energy of 400mJ / cm².2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm, followed by a final curing process with an energy of 800mJ / cm². 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm.

[0088] This application uses a first paint layer with a loop-like texture structure formed by multiple micron-level folds as a matte layer. Its specific formation method enables the second paint layer to cure at the same time, so that the step difference between the two is small or non-existent, and they will not diffuse into each other, resulting in unclear boundaries and affecting the product appearance.

[0089] In some specific implementations, the electronic device housing assembly further includes a primer layer 103 disposed on the surface of the substrate 101. The primer layer 103 is used to improve the adhesion between the substrate 101 and the first paint layer 1021 and the second paint layer 1022. See also Figure 12 , Figure 12 This is a schematic diagram of the stacked structure of an electronic device housing assembly provided in another embodiment of this application, wherein 101 is a substrate, 1021 is a first paint layer, 1022 is a second paint layer, 103 is a primer layer, and 104 is a color paint layer.

[0090] This application does not impose any special restrictions on the primer layer 103, which can be an adhesive resin, such as acrylic resin, polyurethane or epoxy resin.

[0091] To further improve the appearance of the electronic device housing assembly, it may also include a color paint layer 104 disposed on the surface of the primer layer 103. The color paint layer 104 can improve the color of the electronic device housing assembly. In some specific implementations, the color paint layer 104 may include resin and pigments. This application does not have any particular limitations on it, and the color paint layer can be formed using commonly used color paint compositions for housing assemblies.

[0092] This application also provides a method for manufacturing the above-mentioned electronic device housing assembly, comprising the following steps:

[0093] A substrate is provided, the surface of which includes a first region and a second region that are interconnected.

[0094] An excimer paint composition is applied to a first region of the substrate, and a varnish composition is applied to a second region of the substrate.

[0095] After leveling the excimer paint composition and varnish composition, an energy of 1000 mJ / cm was applied. 2 ~2000mj / cm 2The first curing was performed using LEDs with wavelengths of 395nm to 445nm, followed by curing with an energy of 400mJ / cm². 2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm, followed by a final curing process with an energy of 800mJ / cm². 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm to form the first and second paint layers, respectively.

[0096] See Figure 13 , Figure 13 This is a process flow diagram for the fabrication of the electronic device housing assembly provided in this application. First, a first paint layer composition is sprayed onto a first region 301 on the surface of the substrate 30, and then a second paint layer composition is sprayed onto a second region 302. After the first and second paint layer compositions are leveled, they are sequentially pre-cured, excimer-cured, and cured a third time to form a first paint layer 303 and a second paint layer 304 on the substrate.

[0097] Specifically, this application first provides a substrate 30. The surface of the substrate 30 is divided into a first region 301 and a second region 302, which are interconnected, according to a predetermined appearance structure. Then, a first paint composition is applied to the first region 301 and a second paint composition is applied to the second region 302 using a masking method. Those skilled in the art will understand that the second region 302 can be masked before applying the first paint composition to the first region 301, and then the first paint composition can be masked before applying the second paint composition to the second region 302; alternatively, the first region 301 can be masked before applying the second paint composition to the second region 302, and then the second paint composition can be masked before applying the first paint composition to the first region 301. This application does not have any particular limitations in this regard. As mentioned above, the first paint composition can be an excimer paint composition, and the second paint composition can be a varnish composition. This application does not have any particular limitations on the coating method; it can be screen printing, roller coating, spraying, or other coating methods commonly used by those skilled in the art.

[0098] After the excimer paint composition and clear varnish composition are applied, they are leveled to achieve substantially the same thickness. At this point, both the excimer paint composition and clear varnish composition are in a liquid state, and leveling can achieve the same thickness. Simultaneously, the excimer paint composition and clear varnish composition belong to different systems and will not diffuse into each other, thus not affecting their clear boundaries. This application does not impose any particular limitation on the leveling method; leveling can be achieved through gravity or surface tension. In some specific implementations, the leveling temperature is 40℃~60℃, and the time is 5min~10min.

[0099] After leveling, the colloidal paint composition and the clear varnish composition are cured simultaneously, with the specific curing parameters as follows:

[0100] Using an energy of 1000 mJ / cm 2 ~2000mj / cm 2 The first curing was performed using LEDs with wavelengths of 395nm to 445nm, followed by curing with an energy of 400mJ / cm². 2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm, followed by a final curing process with an energy of 800mJ / cm². 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm.

[0101] This application first uses an energy of 1000 mJ / cm 2 ~2000mj / cm 2 The first curing was performed using LED lamps with wavelengths of 395nm–445nm (UVV). During this process, the excimer resin paint composition underwent deep curing, reaching a microgel state, while the clear varnish composition remained unchanged. Then, an energy level of 400mJ / cm² was used for further curing. 2 ~500mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm–275nm (UVC). This excimer lamp has relatively weak penetrating power and cannot reach the deep layers of the excimer resin composition; it only allows for a rapid surface reaction to form a loop-like microstructure, while the varnish composition remains unchanged. Finally, an energy of 800mJ / cm² was used for curing. 2 ~1200mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm to 420nm (UVA) to completely cure the excimer resin paint composition into a film. At the same time, the varnish composition is completely cured into a film, thereby forming the first paint layer 303 and the second paint layer 304.

[0102] This application utilizes the characteristics of excimer resin paint compositions that only undergo surface curing under excimer lamps, forming multiple micron-level wrinkles, and subsequently fully curing into a film, and the characteristics of clear varnish compositions that do not cure under excimer lamps, and the fact that the two do not diffuse into each other. The excimer paint composition and clear varnish composition are respectively coated on the first and second regions of the substrate, forming paint films with different gloss levels under the same curing conditions, thereby obtaining electronic device housing components with different surface effects, such as a combination of gloss and matte or different matte finishes. This process is not only simple and time-saving, but also ensures that the difference in gloss level between paint films with different gloss levels is small or non-existent. At the same time, the excimer paint composition and clear varnish composition do not diffuse into each other, which can avoid the splicing seams being crooked or blurred, ensuring that the electronic device housing components have a better appearance.

[0103] This application provides an electronic device, including the electronic device housing assembly described in the above-described technical solution. The electronic device housing assembly described in the above-described technical solution has a surface coating film with small or no step differences and varying gloss levels, and the seams are clear, resulting in a good appearance. Simultaneously, the first coating layer, having a loop-like texture structure formed by multiple micron-level folds, has a skin-friendly tactile feel, enhancing the user experience of the electronic device.

[0104] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronic device housing assembly, comprising: The substrate, the surface of which includes a first region and a second region that are interconnected; The first region is provided with a first paint layer, and the surface of the first paint layer has a loop-like texture structure formed by multiple micron-level folds; The second region is provided with a second paint layer, and the gloss of the surface of the second paint layer is different from that of the surface of the first paint layer. The first paint layer and the second paint layer are cured and formed simultaneously. The curing process specifically involves: Using an energy of 1000 mJ / cm 2 ~2000 mJ / cm 2 The first curing was performed using LEDs with wavelengths of 395nm~445nm, followed by curing with an energy of 400mJ / cm². 2 ~500 mJ / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm~275nm, followed by a final curing process with an energy of 800 mJ / cm². 2 ~1200 mJ / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm~420nm.

2. The electronic device housing assembly according to claim 1, wherein the gloss of the second paint layer surface is higher than the gloss of the first paint layer surface.

3. The electronic device housing assembly according to claim 2, characterized in that, The first paint layer and the second paint layer have the same thickness.

4. The electronic device housing assembly according to claim 3, characterized in that, The thickness of the first paint layer and the second paint layer is 15μm~50μm.

5. The electronic device housing assembly according to claim 4, characterized in that, The first paint layer is formed by curing an excimer paint composition.

6. The electronic device housing assembly according to claim 5, characterized in that, The excimer paint composition comprises: 30wt%~40wt% excimer resin; 15wt%~25% UV high-functionality resin; 5wt%~10wt% of yellowing-resistant resin; 4wt%~8wt% UV monomer; 1wt%~3wt% of photoinitiator; 10wt%~20wt% solvent; 1wt%~3wt% of additives; 3wt%~6wt% matting agent.

7. The electronic device housing assembly according to claim 4, characterized in that, The second paint layer is formed by curing a varnish composition.

8. The electronic device housing assembly according to claim 7, characterized in that, The varnish composition comprises: 20wt%~35wt% UV high-functionality resin; 10wt%~25wt% UV low-functionality resin; 1wt%~5wt% UV monomer; 2wt%~4wt% of photoinitiator; 1wt%~3wt% leveling agent; Solvents of 20wt%~30wt%; 0~1wt% of additives.

9. The electronic device housing assembly according to any one of claims 1 to 8, characterized in that, The substrate includes any one of metal, resin, or resin composite material.

10. A method for manufacturing an electronic device housing assembly according to any one of claims 1 to 9, comprising the following steps: A substrate is provided, the surface of which includes a first region and a second region that are interconnected. An excimer paint composition is applied to a first region of the substrate, and a varnish composition is applied to a second region of the substrate. After leveling the excimer paint composition and varnish composition, an energy of 1000 mJ / cm was applied. 2 ~2000 mJ / cm 2 The first curing was performed using LEDs with wavelengths of 395nm~445nm, followed by curing with an energy of 400mJ / cm². 2 ~500 mJ / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 200nm~275nm, followed by a final curing process with an energy of 800 mJ / cm². 2 ~1200 mJ / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 320nm~420nm to form the first and second paint layers, respectively.

11. The preparation method according to claim 10, characterized in that, The leveling temperature is 40℃~60℃, and the time is 5min~10min.

12. An electronic device comprising the electronic device housing assembly as described in any one of claims 1 to 9.

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