Appearance structure for terminal device and terminal device

Abstract

The application provides an appearance structure for a terminal device and the terminal device, the appearance structure comprising a base body and a film layer structure, the base body having an outer surface, and the film layer structure being arranged on and fixed to the outer surface of the base body. The film layer structure comprises an inner film layer and an outer film layer which are arranged in a stacking manner along the thickness direction of the appearance structure and are fixed to each other, and the inner film layer is arranged between the outer film layer and the outer surface of the base body. The inner film layer comprises an inner texture layer which is arranged in a structure with textures, and the outer film layer comprises a protective layer which is arranged in a transparent structure. The appearance structure provided in the embodiments of the application has rich visual effects and high reliability.

Description

Technical Field

[0001] This application relates to the field of membrane structure technology, and in particular to an appearance structure for a terminal device and the terminal device itself. Background Technology

[0002] With the widespread adoption and continuous improvement of the functions of terminal devices, consumers have placed higher demands on the appearance design of mobile phones and other terminal devices. Terminal devices typically achieve specific aesthetic effects by attaching a film layer to the substrate of the exterior structural components. Traditional appearance designs are mostly based on single materials, flat surfaces, or simple textures, resulting in severe homogenization and failing to meet consumers' pursuit of personalization and visual appeal. In recent years, although some products have attempted to enhance the appearance through surface textures or pattern designs, these designs often lack depth and fluidity, making it difficult to achieve complex and dynamic visual effects. Visually rich appearance designs require the superposition of different functional layers within the film layer, resulting in a thicker film layer. Furthermore, when the substrate lacks sufficient rigidity, it is often necessary to thicken the film layer to compensate for the overall rigidity of the exterior structural components. Attaching a thicker film layer to the substrate can easily lead to problems such as delamination and cracking, resulting in poor reliability of the entire exterior structural component. Therefore, existing exterior structural components suffer from monotonous visual effects and poor reliability. Utility Model Content

[0003] The appearance structural components and terminal devices provided in this application embodiment solve the problems of monotonous visual effects and poor reliability of existing appearance structural components.

[0004] A first aspect of this application provides an appearance structural component for a terminal device. The appearance structural component includes a substrate and a film structure. The substrate has an outer surface, and the film structure is applied to and fixed to the outer surface of the substrate.

[0005] The membrane structure includes an inner membrane layer and an outer membrane layer, which are stacked and fixed to each other along the thickness direction of the external structural component. The inner membrane layer is disposed between the outer membrane layer and the outer surface of the substrate. The inner membrane layer includes an inner textured layer with a textured structure, and the outer membrane layer includes a protective layer with a transparent structure.

[0006] The appearance structural component provided in this application includes a substrate and a film structure. The outer surface of the substrate refers to the surface of the substrate facing the outside of the terminal device. The film structure is applied to the outer surface of the substrate, and the desired appearance effect can be achieved through the design of the film structure. The film structure includes an inner film layer and an outer film layer. The inner film layer includes an inner texture layer, whose main function is to present textures, such as patterns and designs. By adjusting the formulation and preparation process of the inner texture layer, a rich variety of texture effects can be presented. The outer film layer includes a protective layer, whose main function is to protect the inner film layer, preventing the texture of the inner film layer from being chemically and physically damaged during long-term use. It also enhances the rigidity of the appearance structural component, making it more durable. The outer film layer is disposed outside the inner film layer, and the protective layer is made transparent, allowing the texture effect of the inner film layer to be seen through the protective layer.

[0007] Because the membrane structure is located on the outer surface of the substrate, and the appearance of the exterior structural component depends entirely on the membrane structure, while the appearance of the substrate itself has no impact on the overall visual presentation of the exterior structural component, the substrate material can be freely selected. For example, considering structural characteristics such as rigidity and bending resistance, harder materials such as metals can be chosen to ensure the reliability of the exterior structural component. Based on this, the design and material selection of the membrane structure can focus on the appearance effect without needing to compensate for insufficient rigidity of the substrate by thickening the membrane structure. Therefore, the membrane structure can be made relatively thin and fits the substrate surface more closely, making the bond between the two more reliable and reducing the risk of delamination and cracking. Furthermore, the inner texture layer of the membrane structure already meets the basic appearance requirements. Due to the overall thinness of the membrane structure, more functional layers (such as multiple texture layers) can be superimposed within it while ensuring reliability. This results in a richer and more diverse visual effect for the exterior structural component, enhancing its layering and texture, and giving the product a higher level of sophistication and differentiation.

[0008] Therefore, the appearance structural components provided in this application have rich visual effects and high reliability.

[0009] In one possible implementation, the substrate includes metallic and / or non-metallic portions.

[0010] In one possible implementation, the thickness of the inner membrane layer is in the range of 0.07 mm to 0.17 mm, the thickness of the outer membrane layer is in the range of 0.07 mm to 0.24 mm, and the total thickness of the membrane structure is in the range of 0.15 mm to 0.43 mm.

[0011] By controlling the total thickness of the membrane structure, as well as the thicknesses of the inner and outer membrane layers, within the aforementioned range, both visual effects can be satisfied, and the thickness of the membrane structure can be kept relatively thin, thereby improving the fit between the membrane structure and the substrate.

[0012] In one possible implementation, the inner texture layer is set as any one of: cellulose acetate membrane, thermoplastic polyurethane membrane, or polyurethane membrane. These membrane materials can all be processed to produce textures, exhibiting a unique gloss, and are relatively thin, occupying little thickness space, which is beneficial for superimposing other layers in the membrane structure. Adjusting the membrane material formulation and preparation process can further modify the texture effect, obtaining a rich variety of patterns and designs.

[0013] In one possible implementation, the protective layer is a polymer film. The transparency of the protective layer is greater than or equal to 50% to clearly present the texture effect of the inner film layer.

[0014] In one possible implementation, the outer film layer further includes a first outer texture layer, which is disposed on the side of the protective layer opposite to the inner film layer and is configured to have a textured structure. The first outer texture layer has a matte finish.

[0015] Adding a first outer texture layer to the outer membrane layer allows the texture of the first outer texture layer to be superimposed with the texture of the inner texture layer, making the texture of the membrane structure more layered and fluid.

[0016] In one possible implementation, the outer membrane layer further includes a second outer texture layer, which is disposed on the side of the protective layer near the inner membrane layer and is configured to have a textured structure. Superimposing the second outer texture layer can further enhance the richness and layering of the overall texture of the membrane structure; multiple textures can present a three-dimensional visual effect.

[0017] In one possible implementation, the outer film layer also includes a coating layer, which is disposed on the side of the protective layer close to the inner film layer. The coating layer has multiple functions, such as enhancing hardness, resisting oxidation, improving heat dissipation performance, blocking ultraviolet rays, and slowing down the aging and fading of the dye layer. Optical coatings can also control optical and color effects, comprehensively improving the texture and durability of the appearance structural components.

[0018] In one possible implementation, the inner film layer further includes a substrate layer disposed on the side of the inner texture layer opposite to the outer film layer, and configured as a colored structure. The colored structure allows the film structure to exhibit a variety of colors, masking the color and defects of the substrate.

[0019] In one possible implementation, the substrate layer includes a cover ink layer, or the substrate layer includes an offset layer.

[0020] Using the above method, the cover ink layer can provide basic colors such as white, black, and blue, and can be directly sprayed onto the inner texture layer, making the processing method relatively simple. The offset printing layer can be processed to produce personalized base colors, such as gradient colors and rainbow colors.

[0021] In one possible implementation, a first adhesive layer is provided between the outer membrane layer and the inner membrane layer, and the two layers are fixedly connected by the first adhesive layer; a second adhesive layer is provided between the membrane structure and the outer surface of the substrate, and the two layers are fixedly connected by the second adhesive layer.

[0022] The inner and outer membrane layers are fixedly connected by adhesive bonding, which is simple to operate, easy to process, and provides strong adhesion. This method allows the membrane structure to be processed as a whole before being bonded to the substrate, facilitating further processing and ensuring more reliable bonding between the internal layers.

[0023] In one possible implementation, the first adhesive layer includes a first adhesive aid layer, a first adhesive layer, and a second adhesive aid layer that are sequentially stacked and fixedly connected along the thickness direction of the exterior structural component. The first adhesive aid layer is disposed between the outer film layer and the first adhesive layer and is fixedly connected to the side of the outer film layer near the inner film layer. The second adhesive aid layer is disposed between the first adhesive layer and the inner film layer and is fixedly connected to the side of the inner film layer near the outer film layer.

[0024] By adopting the above solution, an adhesion-enhancing layer is added to the upper and lower surfaces of the first adhesive layer to improve the adhesion between the first adhesive layer and the inner and outer film layers, making the adhesion strength more reliable.

[0025] In one possible implementation, both the first and second adhesion promoter layers are made of varnish. Varnish can improve the interfacial state between the adhesive layer and other layers, working synergistically through physical wetting, chemical bonding, and mechanical interlocking to form a stronger interfacial bond and enhance adhesive strength.

[0026] In one possible implementation, the second adhesive layer includes a second adhesive layer, which is configured as an adhesive film or an adhesive layer formed after the flowable adhesive has cured. Using an adhesive layer for bonding is cost-effective and easy to operate.

[0027] In one possible implementation, the membrane structure further includes an inner protective membrane layer, which is stacked and fixedly connected between the inner membrane layer and the outer surface of the substrate. The inner protective membrane layer includes a protective layer, which is configured as a polymer membrane.

[0028] Using the above scheme, the inner film layer is sandwiched between two protective film layers (outer film layer and inner protective film layer). The two film layers protect both sides of the inner film layer, making the texture of the inner film layer clear, durable and long-lasting.

[0029] In one possible implementation, the exterior structural component is the casing of the terminal device. Designing personalized patterns, designs, and colors on the casing of the terminal device can give the product a differentiated appearance, thereby distinguishing it from other products on the market. Excellent appearance design can often attract more consumers and enhance the product's competitiveness.

[0030] A second aspect of this application provides a terminal device including the appearance structural component provided in any of the above embodiments. The surface of the film structure facing away from the substrate in the appearance structural component constitutes at least a portion of the outer surface of the terminal device, such that the visual effect of the film structure is presented on the outside of the terminal device. Attached Figure Description

[0031] Figure 1a This is a three-dimensional structural diagram of the terminal device according to an embodiment of this application;

[0032] Figure 1b This is a three-dimensional structural diagram of the terminal device in an embodiment of this application. Figure 2 ;

[0033] Figure 2 This is a cross-sectional structural diagram of the terminal device according to an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the stacked structure of an exterior structural component in a reference design;

[0035] Figure 4 This is a schematic diagram of the stacked structure of the first embodiment of the appearance structural component of this application;

[0036] Figure 5 This is a schematic diagram of the stacked structure of the second embodiment of the appearance structural component of this application;

[0037] Figure 6 This is a schematic diagram of the stacked structure of the third embodiment of the appearance structural component of this application;

[0038] Figure 7 This is a schematic diagram of the stacked structure of the fourth embodiment of the appearance structural component of this application;

[0039] Figure 8 This is a schematic diagram of the first processing flow for the appearance structural component according to an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the second processing flow for the appearance structural component in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] Reference Design:

[0043] 100', Exterior structural components;

[0044] 1', Substrate; 10', Outer surface; 11', Inner surface;

[0045] 2', Membrane structure; 31', Texture layer; 41', Protective layer;

[0046] 5' First adhesive layer; 6' Second adhesive layer.

[0047] This application:

[0048] 100. Exterior structural components;

[0049] 1. Substrate; 10. Outer surface; 2. Film structure;

[0050] 3. Inner film layer; 31. Inner texture layer; 32. Substrate layer; 321. Cover ink layer; 322. Offset layer; 323. Third adhesion aid layer;

[0051] 4. Outer film layer; 41. Protective layer; 42. First outer texture layer; 43. Second outer texture layer; 44. Coating layer;

[0052] 5. First adhesive layer; 51. First adhesion aid layer; 52. First adhesive layer; 55. Second adhesion aid layer;

[0053] 6. Second adhesive layer; 61. Second glue layer;

[0054] 7. Inner protective film layer; 71. Protective layer; 72. Third adhesive layer;

[0055] 200. Terminal equipment; 81. Screen; 82. Housing; 821. Mid-frame; 8211. Mid-plate; 8212. Outer frame; 822. Back cover; 83. Camera module; 84. Camera decorative parts;

[0056] Z, the thickness direction of the exterior structural components. Detailed Implementation

[0057] Exterior structural components refer to parts that constitute the external form of a product and also provide structural support. They are widely used in smartphones, laptops, tablets, smart home devices, wearable devices, automotive electronics, and other fields. Terminal devices typically achieve specific aesthetic effects by attaching a film layer structure to the substrate of the exterior structural component. To enhance the richness of the terminal device's appearance and meet consumers' demands for product quality, this application provides an exterior structural component that achieves thinning of the film layer structure through a special lamination design, thereby improving the visual texture richness while ensuring the reliability of the exterior structural component.

[0058] It should be noted that the appearance structural components provided in the embodiments of this application can be applied to all terminal devices that require an aesthetic effect, such as mobile phones, monitors, laptops, PCs (Personal Computers), tablets (portable Android devices, PADs), wearable devices, in-vehicle devices, virtual reality (VR) devices, augmented reality (AR) devices, e-book readers, digital cameras, printers, and speakers. The embodiments of this application do not limit the type of terminal device or its field of application. To make the objectives, technical solutions, and advantages of this application clearer, the implementation methods of this application will be further described in detail below using a mobile phone as an example.

[0059] Please see Figures 1a to 2 , Figure 1a This is a three-dimensional structural diagram of the terminal device according to an embodiment of this application; Figure 1b This is a three-dimensional structural diagram of the terminal device in an embodiment of this application. Figure 2 ; Figure 2 This is a cross-sectional structural diagram of the terminal device according to an embodiment of this application.

[0060] like Figures 1a to 2 As shown, this application embodiment provides a terminal device 200. In one possible implementation, the terminal device 200 is a mobile phone. Specifically, the terminal device 200 includes a housing 82 and a screen 81 mounted on the housing 82. The housing 82 serves to protect the terminal device 200 and support the entire device, while the screen 81 is used to display images. The screen 81 can be, but is not limited to, a liquid crystal display (LCD), an organic light-emitting diode (OLED) screen, an active-matrix organic light-emitting diode (AMOLED) screen, or a quantum dot light-emitting diode (QLED) screen, etc. This application embodiment does not limit the type and specific structure of the screen 81.

[0061] The specific structure of the shell 82 is not limited. For example... Figure 2As shown, in one possible implementation, the housing 82 includes a middle frame 821 and a back cover 822. The middle frame 821 has a middle plate 8211 and an outer frame 8212, with the outer frame 8212 surrounding and connecting to the outer periphery of the middle plate 8211. The middle plate 8211 supports the screen 81 and the internal components of the terminal device 200, while the outer frame 8212 is a frame structure surrounding the periphery of the terminal device 200, which helps to fix the screen 81 and the back cover 822. The back cover 822, also called a battery cover, is located on the back of the terminal device 200. The back cover 822, the middle frame 821, and the screen 81 can together form a closed enclosure to house the electronic components inside the terminal device 200. In another possible implementation, the terminal device 200 may not have a separate back cover 822; instead, the middle plate 8211 of the middle frame 821 can be directly used as the back cover 822. The base plate and the outer frame 8212 can be an integral structure or a separate structure; this application embodiment does not limit this.

[0062] The materials of the mid-frame 821 and the back cover 822 are not limited. They can be metals, such as titanium alloy, aluminum alloy, magnesium alloy, etc., or non-metals, such as plastic, glass, ceramic, etc., or a combination of metals and non-metals. This application embodiment does not impose any restrictions on this. It should be noted that the housing 82 of the terminal device 200 can be a 2D housing or a 3D housing. This application embodiment does not impose any restrictions on this. Among them, a 2D housing refers to a housing with a flat surface (such as the outer surface of the back cover 822, the outer wall surface of the outer frame), and a 3D housing refers to a housing with curved surfaces, such as arc surfaces, parabolic surfaces, etc., and there are no specific restrictions.

[0063] Those skilled in the art will understand that the housing 82 of the terminal device 200 is an appearance structural component. Designing personalized patterns, designs, and colors on the housing 82 can give the product a differentiated appearance, thus distinguishing it from other products on the market. Excellent appearance design can often attract more consumers and enhance the product's competitiveness. The appearance structural component 100 provided in this application embodiment can be applied to the housing 82 of the terminal product. It should be noted that the housing 82 of the terminal product can be entirely (including the back cover 822 and the middle frame 821) using the appearance structural component 100 provided in this application embodiment, or only a portion of it can use the appearance structural component 100 provided in this application embodiment. For example, only the back cover 822 can use the appearance structural component 100 provided in this application embodiment, or only the middle frame 821 can use the appearance structural component 100 provided in this application embodiment; there is no limitation on this.

[0064] like Figure 1bAs shown, in one possible implementation, the terminal device 200 further includes a camera module 83 and a camera decorative element 84. The camera module 83 is installed inside the terminal device 200 and includes one or more cameras, each performing a different shooting function. This application embodiment does not limit the number or specific type of cameras. The camera decorative element 84 is installed on the back cover 822 and is used to protect, fix, and seal the camera, serving as part of the electronic device's appearance. The camera decorative element 84 can be circular, hexagonal, rectangular, etc., and this application embodiment does not impose any limitations on this; the accompanying drawings are for illustrative purposes only. Those skilled in the art will understand that the camera decorative element 84 is also an appearance structural component and can adopt the appearance structural component 100 provided in this application embodiment.

[0065] Some terminal devices 200 are also equipped with a bracket, which is rotatably connected to the housing 82 and can be used to support the entire device when unfolded. The bracket is also an external structural component 100 and can be the external structural component 100 provided in the embodiments of this application. In addition to the examples above, the terminal product may also include other external structural components, all of which can be the external structural components 100 provided in the embodiments of this application, and will not be listed here one by one.

[0066] Please see Figure 3 , Figure 3 This is a schematic diagram of the stacked structure of an exterior structural component in a reference design.

[0067] like Figure 3 As shown, in one reference design, the appearance structural component 100' includes a substrate 1' and a membrane structure 2', wherein the substrate 1' has an outer surface 10' and an inner surface 11', and the membrane structure 2' is applied to the inner surface 11' of the substrate 1'. The inner surface 11' can be understood as the surface of the substrate 1' facing the interior of the terminal device, and conversely, the outer surface 10' can be understood as the surface of the substrate 1' facing the exterior of the terminal device. The user sees the outer surface 10' of the appearance structural component 100' from the outside.

[0068] The film structure 2' includes a textured layer 31' and a protective layer 41' stacked together, with the textured layer 31' disposed between the substrate 1' and the protective layer 41'. The textured layer 31' is used to present texture, and multiple textured layers can be set in the film structure 2' to enrich the appearance. The protective layer 41' is disposed inside the textured layer 31' to protect it. The film structure 2' is bonded and fixed to the inner surface 11' of the substrate 1' by a first adhesive layer 5', and the textured layer 31' and the protective layer 41' are fixedly connected by a second adhesive layer 6'.

[0069] Understandably, the substrate 1' is the main supporting structure in the appearance structural component 100', and its mechanical performance requirements are high. However, since the substrate 1' is located on the outermost side of the appearance structural component 100', it must be made transparent so that users can see the texture of the texture layer through the substrate 1'. Therefore, the material selection for the substrate 1' is very limited, and only transparent materials such as glass and plastic can be used. These materials have defects such as poor rigidity, fragility, and poor bending resistance, resulting in poor reliability. In order to improve the reliability of the appearance structural component 100', it is often necessary to increase the thickness of the protective layer 41' in the membrane structure 2' to compensate for the reliability of the substrate 1', resulting in a thicker membrane structure 2' (the overall thickness of the membrane structure 2' is greater than 0.4 mm).

[0070] The manufacturing process of the appearance structural component 100' typically involves first separately fabricating the membrane structure 2' and the substrate 1', and then attaching the membrane structure 2' to the substrate 1'. When the membrane structure 2' is thick, attaching it to the substrate 1' easily leads to problems such as delamination and cracking, resulting in extremely poor reliability of the appearance structural component 100'. These problems are particularly severe in 3D shells, where stress concentration occurs when the membrane structure 2' is attached to curved surfaces, further increasing the risk of delamination and cracking. To mitigate this risk, the thickness of the membrane structure 2' must be controlled within a certain range to avoid excessive thickness. This also means that the number of layers in the membrane structure 2' is limited, preventing the use of multiple layers to enrich the appearance. Moreover, increasing the thickness of the protective layer 41' also reduces the space for other layers, further restricting their number. Therefore, the appearance design of such appearance structural components 100' is often relatively simple and lacks depth. The appearance structural component 100 provided in this application overcomes the above-mentioned defects, which will be described in detail below with reference to the accompanying drawings.

[0071] Please see Figure 4 , Figure 4 This is a schematic diagram of the stacked structure of the first embodiment of the appearance structural component of this application.

[0072] The appearance structural component 100 provided in this application embodiment includes a substrate 1 and a membrane structure 2. The substrate 1 has an outer surface 10, and the membrane structure 2 is covered and fixed to the outer surface 10 of the substrate 1. The outer surface 10 can be understood as the surface of the substrate 1 facing the outside of the terminal structure, for example... Figure 2 The upper surface of the middle and rear cover 822 and the outer wall surface of the outer frame 8212. By covering the outer surface 10 of the substrate 1 with the film structure 2, the desired appearance effect can be achieved through the design of the film structure 2.

[0073] The membrane structure 2 includes an inner membrane layer 3 and an outer membrane layer 4, which are stacked and fixed to each other along the thickness direction Z of the external structural component. The inner membrane layer 3 is disposed between the outer membrane layer 4 and the outer surface 10 of the substrate 1. The inner membrane layer 3 includes an inner texture layer 31, which is configured to have a textured structure. The outer membrane layer 4 includes a protective layer 41, which is configured to be transparent.

[0074] The main function of the inner texture layer 31 in the inner film layer 3 is to present textures, such as patterns and designs. By adjusting the formulation and preparation process of the inner texture layer 31, a rich variety of texture effects can be achieved. The outer film layer 4 includes a protective layer 41, whose main function is to protect the inner film layer 3 from chemical and physical damage during long-term use. It also enhances the rigidity of the appearance structural component 100, making it more durable. The outer film layer 4 is disposed on the outside of the inner film layer 3, and the protective layer 41 is made transparent, allowing the texture effect of the inner film layer 3 to be seen through the protective layer 41.

[0075] It should be noted that the protective layer 41 can be a completely transparent structure (with a light transmittance close to 100%, allowing light to pass through in a straight line with almost no scattering or absorption), or a semi-transparent structure (with a light transmittance less than 100%, allowing light to be scattered multiple times or partially absorbed by the internal microstructure). As long as the user can see the pattern of the inner film layer 3 through the outer film layer 4, this embodiment does not impose any limitations on this. In one possible implementation, the transparency of the protective layer 41 is greater than or equal to 50%, or can be understood as a light transmittance greater than or equal to 50%, to clearly present the texture effect of the inner film layer 3. In some possible implementations, the transparency of the protective layer 41 can also be less than 50%, and this embodiment does not impose any limitations on this.

[0076] Since the membrane structure 2 is located on the outer surface 10 of the substrate 1, and the appearance of the appearance structural component 100 depends entirely on the membrane structure 2, while the appearance of the substrate 1 itself has no impact on the overall visual presentation of the appearance structural component 100, the material of the substrate 1 can be freely selected. For example, considering structural characteristics such as rigidity and bending resistance, a harder material such as metal can be selected to ensure the reliability of the appearance structural component 100. Based on this, the design and material selection of the membrane structure 2 can focus on the appearance effect, without needing to thicken the membrane structure 2 to compensate for the insufficient rigidity of the substrate 1. Therefore, the membrane structure 2 can be made relatively thin and fits more closely to the surface of the substrate 1, making the bond between the two more reliable and reducing the risk of delamination and cracking. Furthermore, the inner texture layer 31 of the membrane structure 2 already satisfies the basic appearance effect. Since the membrane structure 2 is relatively thin overall, more functional layers (such as multiple texture layers) can be superimposed on it while ensuring reliability. This makes the visual effect of the appearance structural component 100 richer and more diverse, enhancing its layering and texture, and giving the product a higher level of sophistication and differentiation. Therefore, the appearance structural component 100 provided in this application embodiment has a rich visual effect and high reliability.

[0077] In one possible implementation, when the appearance structure 100 is applied to the terminal device 200, the surface of the film structure 2 in the appearance structure 100 facing away from the substrate 1 constitutes at least a portion of the outer surface of the terminal device 200. The outer surface of the terminal device 200 can be understood as its appearance surface, i.e., the surface that the user can directly observe from the outside, so that the visual effect of the film structure 2 is presented on the outside of the terminal device 200. For example, as... Figure 2 As shown, in one possible implementation, the back cover 822 of the terminal device 200 adopts the appearance structural component 100 provided in the embodiments of this application, and the surface of the film structure 2 facing away from the substrate 1 constitutes the outer surface of the back cover 822. Figure 2 (The upper surface of the back cover 822 is shown in the middle). It should be noted that the surface of the film structure 2 in the appearance structure 100 that is away from the substrate 1 can constitute the entire outer surface 10 of the terminal device 200, or it can only constitute a part of the outer surface 10 of the terminal device 200. This application embodiment does not limit this.

[0078] It should be noted that the specific materials of each layer in the substrate 1 and the membrane structure 2 are not limited. In one possible implementation, the substrate 1 includes metallic and / or non-metallic parts. This can be understood as the substrate 1 being entirely made of metallic materials, such as aluminum alloy, titanium alloy, stainless steel, etc. Alternatively, the substrate 1 can be entirely made of non-metallic materials, such as fiber-reinforced composite (FRP), plastic, ceramic, glass, etc. Or, the substrate 1 can be a hybrid of metallic and non-metallic materials, i.e., one part is made of metallic materials and the other part is made of non-metallic materials; there are no specific restrictions, and the choice can be flexible according to actual needs. Preferably, the substrate 1 can be made of a high-strength metallic material to ensure the overall mechanical properties of the appearance structural component 100 and improve reliability.

[0079] In one possible implementation, the inner texture layer 31 is set as any one of the following: cellulose acetate (CA) film, thermoplastic polyurethane (TPU) film, or polyurethane (PU) film. All of these film materials can be processed to produce textures, exhibiting a unique glossy finish. They are also relatively thin, occupying little thickness space, which is beneficial for stacking other layers in the film structure 2. Adjusting the film material formulation and preparation process can further adjust the texture effect, obtaining a rich variety of patterns and designs. Other materials can also be used for the inner texture layer 31; the above are merely examples.

[0080] In one possible implementation, the protective layer 41 is a polymer film, including but not limited to PC (polycarbonate), PMMA (polymethyl methacrylate), PET (polyethylene terephthalate), PE (polyethylene), and composite sheets (such as composite sheets of PC and PMMA). These materials have high transparency, a certain degree of hardness, and waterproof properties, allowing the internal texture to be displayed while protecting the inner membrane and the shell 82. Furthermore, these materials are relatively inexpensive, saving on production costs. Other materials can also be used for the protective layer 41; the above are merely examples.

[0081] It should be noted that the thickness of the overall appearance structural component 100 and its internal layers is not limited. In one possible implementation, the thickness of the inner film layer 3 is in the range of 0.07mm to 0.17mm, the thickness of the outer film layer 4 is in the range of 0.07mm to 0.24mm, and the total thickness of the film structure 2 is in the range of 0.15mm to 0.43mm. By controlling the total thickness of the film structure 2, as well as the thicknesses of the inner film layer 3 and the outer film layer 4, within the above ranges, both visual effects can be satisfied, and the thickness of the film structure 2 can be kept relatively thin, improving the adhesion between the film structure 2 and the substrate 1. It should be noted that the thickness of the inner film layer 3 can also be less than 0.07mm or greater than 0.17mm, the thickness of the outer film layer 4 can also be less than 0.07mm or greater than 0.24mm, and the total thickness of the film structure 2 can be less than 0.15mm or greater than 0.43mm; this embodiment does not impose any limitations on these aspects.

[0082] In one possible implementation, the thickness of the inner texture layer 31 in the inner film layer 3 is in the range of 0.05 mm to 0.10 mm, which can ensure the structural strength, stability, and texture effect of the inner texture layer 31. Furthermore, a smaller thickness of the inner texture layer 31 can reduce the impact on the overall strength of the film structure 2. In some possible implementations, the thickness of the inner film layer 3 can also be less than 0.05 mm or greater than 0.10 mm; this embodiment does not impose any limitations on this.

[0083] In one possible implementation, the thickness of the protective layer 41 in the outer film layer 4 is in the range of 0.05 mm to 0.20 mm, providing sufficient strength to protect the inner texture layer 31 without being too thick to avoid affecting the bonding and conformability between the film structure 2 and the substrate 1. In some possible implementations, the thickness of the protective layer 41 may also be less than 0.05 mm or greater than 0.20 mm; this embodiment does not impose any limitations on this.

[0084] The thickness of the substrate 1 is related to its material selection. In one possible implementation, when the substrate 1 is made of metal, its thickness is in the range of 0.1mm to 1.0mm. When the substrate 1 is made of plastic, its thickness is in the range of 0.5mm to 2.0mm. When the substrate 1 is made of fiber-reinforced composite, its thickness is in the range of 0.1mm to 1.0mm. Setting the thickness of the substrate 1 within the above range according to the material selection can meet the strength requirements of the appearance structural component 100 and has high reliability. Furthermore, the thickness of the substrate 1 is not too large, saving material costs and contributing to the thinner and lighter design of the terminal device 200.

[0085] Those skilled in the art will understand that setting an inner texture layer 31 in the inner film layer 3 and a protective layer 41 in the outer film layer 4 only satisfies the most basic texture effect and protection requirements. Based on this, more layers can be stacked in the film structure 2 to further enhance the visual effect and the strength of the film structure 2. A variety of layers can be added, such as other texture layers, as well as optical coatings, ink layers, offset printing layers, liquid crystal layers, etc., which can enhance the overall texture flow and three-dimensionality of the film structure 2, achieving innovative appearance design. Specifically, more texture layers, optical coatings, liquid crystal layers, offset printing layers, screen printing layers, etc., can be added to the inner film layer 3 to achieve texture diversification and innovation; texture layers, optical coatings, liquid crystal layers, offset printing layers, etc., can be added to the outer film layer 4 to optimize the texture of the film structure 2. The type, quantity, and positional distribution of the added layers in the film structure 2 can be flexibly designed according to the desired visual effect; the solutions provided in this application are merely examples. The following uses two solutions as examples to further illustrate the layers that can be added to the film structure 2 and their corresponding effects.

[0086] Please see Figures 5 to 7 , Figure 5 This is a schematic diagram of the stacked structure of the second embodiment of the appearance structural component of this application; Figure 6 This is a schematic diagram of the stacked structure of the third embodiment of the appearance structural component of this application; Figure 7 This is a schematic diagram of the stacked structure of the fourth embodiment of the appearance structural component of this application.

[0087] like Figure 5 As shown, in one possible implementation, the outer membrane layer 4 further includes a first outer texture layer 42. The first outer texture layer 42 is disposed on the side of the protective layer 41 opposite to the inner membrane layer 3 and is configured with a textured structure (e.g., patterns, designs, etc.). Adding the first outer texture layer 42 to the outer membrane layer 4 allows the texture of the first outer texture layer 42 to be superimposed with the texture of the inner texture layer 31, making the texture of the membrane structure 2 more layered and fluid. In one possible implementation, the first outer texture layer 42 has a matte structure, thereby giving the appearance structure 100 a matte texture, reducing reflection, preventing dizziness, and providing greater visual comfort. In some possible implementations, the first outer texture layer 42 can also be a high-gloss structure; this embodiment does not limit this.

[0088] The material and processing method of the first outer texture layer 42 are not limited. In one possible implementation, the first outer texture layer 42 can be an adhesive layer processed by AG (Anti-Glare) technology. Specifically, the AG process is used to change the originally smooth, reflective surface into a matte diffuse reflective surface, thereby eliminating glare. Through pre-designed micro-textures, decorative patterns (such as imitation stone texture, cement texture, brushed texture, etc.) are presented, increasing the three-dimensional depth effect. As the outermost layer of the appearance structural component 100, the adhesive layer can also protect the inner layers and prevent the inner decorative texture from being scratched or contaminated.

[0089] like Figure 6 As shown, in one possible implementation, the outer membrane layer 4 may further include a second outer texture layer 43. The second outer texture layer 43 is disposed on the side of the protective layer 41 near the inner membrane layer 3 and is configured to have a textured structure. Superimposing the second outer texture layer 43 can further enhance the richness and layering of the overall texture of the membrane structure 2, and the multi-layered texture can present a three-dimensional visual effect. This application embodiment does not limit the material and type of the second outer texture layer 43; for example, it can be an adhesive layer, a cellulose acetate membrane, etc.

[0090] like Figure 6 As shown, in one possible implementation, the outer film layer 4 may further include a coating layer 44, which is disposed on the side of the protective layer 41 near the inner film layer 3. The coating layer 44 has multiple functions, such as enhancing hardness, resisting oxidation, improving heat dissipation performance, blocking ultraviolet rays, and slowing down the aging and fading of the dye layer. Optical coatings can also control optical and color effects. Some coating layers 44 can also achieve high-reflection mirror effects, thereby comprehensively improving the texture and durability of the appearance structural component 100. The type and material of the coating layer 44 can be set as needed, such as metal compound coatings such as silicon oxide, niobium oxide, and titanium oxide. This application embodiment does not limit this.

[0091] In one possible implementation, each layer in the outer film layer 4 is configured as a transparent structure (including completely transparent and semi-transparent), so that the outer film layer 4 as a whole presents a transparent effect, and the texture and color of the inner texture layer 31 can be seen through the outer film layer 4. This application embodiment does not limit the transparency of each layer in the outer film layer 4.

[0092] like Figure 5 As shown, in one possible implementation, the inner film layer 3 further includes a substrate layer 32. The substrate layer 32 is disposed on the side of the inner texture layer 31 opposite to the outer film layer 4 and is configured as a colored structure. The colored structure can be understood as a structure that allows the film structure 2 to display color (e.g., white, red, green, purple, etc.), which can mask the color and defects of the substrate 1. The specific type and material of the substrate layer 32 are not limited, such as... Figure 5As shown, in one possible implementation, the substrate layer 32 includes a capping ink layer 321, which can provide basic colors such as white, black, and blue. The capping ink layer 321 can be directly sprayed onto the bottom surface of the inner texture layer 31 (i.e., the surface facing away from the outer film layer 4), making the processing method relatively simple. Figure 6 As shown, in an alternative implementation, the substrate layer 32 includes an offset printing layer 322. The offset printing layer 322 transfers patterns and colors onto the adhesive layer, allowing for the creation of personalized background colors, such as gradients or rainbow colors. The offset printing layer 322 is bonded to the inner texture layer 31. Specifically, the offset printing layer 322 can be directly bonded to the bottom surface of the inner texture layer 31, or, as shown... Figure 6 As shown, the substrate layer 32 may further include a third adhesion promoter layer 323, which is disposed between the offset printing layer 322 and the inner texture layer 31 to increase the adhesion between the offset printing layer 322 and the inner texture layer 31 and improve the bonding force. The material of the third adhesion promoter layer 323 can be varnish or the like, and there are no specific limitations.

[0093] More membrane layers can be added to membrane structure 2, such as Figure 7 As shown, in one possible implementation, the membrane structure 2 further includes an inner protective membrane layer 7, which is stacked and fixedly connected between the inner membrane layer 3 and the outer surface 10 of the substrate 1. The inner protective membrane layer 7 includes a protective layer 71, which is a polymer membrane. With this structure, the inner membrane layer 3 is sandwiched between two protective membrane layers (outer membrane layer 4 and inner protective membrane layer 7), and the two membrane layers protect both sides of the inner membrane layer 3, making the texture of the inner membrane layer 3 clear, durable, and long-lasting. The material of the protective layer 71 is not limited, and can be, for example, PC, PMMA, PET, PE, composite boards, etc. In some possible implementations, a textured layer, a coating layer, etc., can also be superimposed on the inner protective membrane layer 7 to enrich the visual effect of the membrane structure 2. In one possible implementation, the inner protective membrane layer 7 can be fixedly connected to the inner membrane layer 3 through a third adhesive layer 72. The material of the third adhesive layer 72 is not limited, and can include, for example, an adhesive layer, which can be an adhesive film or a cured flowable adhesive; there are no specific limitations.

[0094] It should be noted that the order of the layers in the above-mentioned membrane structure 2 can be interchanged; the attached diagram is for illustrative purposes only.

[0095] The bonding method between the outer membrane layer 4 and the inner membrane layer 3 is not limited, such as Figures 4 to 6 As shown, in one possible implementation, a first adhesive layer 5 is provided between the outer membrane layer 4 and the inner membrane layer 3, and the two layers are fixedly connected by the first adhesive layer 5. This adhesive method for fixing the inner membrane layer 3 and the outer membrane layer 4 is simple to operate, easy to process, and provides strong bonding.

[0096] The material and structure of the first adhesive layer 5 are not limited, such as Figure 5As shown, in one possible implementation, the first adhesive layer 5 includes a first adhesive aid layer 51, a first adhesive layer 52, and a second adhesive aid layer 55, which are sequentially stacked and fixedly connected along the thickness direction Z of the outer structural component. The first adhesive aid layer 51 is disposed between the outer film layer 4 and the first adhesive layer 52, and is fixedly connected to the side of the outer film layer 4 near the inner film layer 3. The second adhesive aid layer 55 is disposed between the first adhesive layer 52 and the inner film layer 3, and is fixedly connected to the side of the inner film layer 3 near the outer film layer 4. Those skilled in the art will understand that the bonding strength between the materials of the inner film layer 3 and the outer film layer 4 and the first adhesive layer 52 may be poor (e.g., ...). Figure 5 When the middle protective layer 41 is made of plastic, its adhesion to the first adhesive layer 52 is poor, resulting in weak bonding. Therefore, an adhesion-enhancing layer is added to the upper and lower surfaces of the first adhesive layer 52 to improve the adhesion between the first adhesive layer 52 and the inner film layer 3 and the outer film layer 4, making the bonding strength more reliable. In some possible implementations, an adhesion-enhancing layer may be provided only on one surface of the first adhesive layer 52, such as only the first adhesion-enhancing layer 51 or only the second adhesion-enhancing layer 55. This application embodiment does not limit this.

[0097] The materials of the first adhesion promoter 51 and the second adhesion promoter 55 are not limited. In one possible implementation, the material of the first adhesion promoter 51 and / or the second adhesion promoter 55 is a clear varnish. The clear varnish can improve the interface state between the adhesive layer and other layers, working synergistically in terms of physical wetting, chemical bonding, and mechanical interlocking to form a stronger interfacial bond and improve adhesive strength. The materials of the first adhesion promoter 51 and the second adhesion promoter 55 can be the same or different, and this application embodiment does not limit this. The first adhesive layer 52 can be an adhesive film, such as a backing adhesive, or a thermosetting or thermoplastic adhesive film formed from polyurethane, epoxy resin, etc. The first adhesive layer 52 can also be a cured flow adhesive, such as UV adhesive (Ultraviolet Curing Adhesive), OCA adhesive (Optically Clear Adhesive), hot melt adhesive, etc., and this application embodiment does not limit its material. Preferably, the first adhesive layer 52 can be a UV adhesive. UV adhesive has a simple curing method, fast curing speed and low cost, which can improve the manufacturing efficiency of the appearance structural component 100 and reduce the manufacturing cost.

[0098] like Figures 4 to 6 As shown, in one possible implementation, a second adhesive layer 6 is provided between the membrane structure 2 and the outer surface 10 of the substrate 1, and the membrane structure 2 is fixedly connected through the second adhesive layer 6. By fixing the membrane structure 2 to the substrate 1 through adhesive bonding, the membrane structure 2 can be processed as a whole before being bonded to the substrate 1, which facilitates the processing of the membrane structure 2 and makes the bonding between the internal layers of the membrane structure 2 more reliable.

[0099] The structure and material of the second adhesive layer 6 are not limited. In one possible implementation, the second adhesive layer 6 includes a second adhesive layer 61. The second adhesive layer 61 can be an adhesive film, such as a backing adhesive, or a thermosetting or thermoplastic adhesive film formed of polyurethane, epoxy resin, etc. The second adhesive layer 61 can also be a cured flow adhesive, such as UV adhesive, OCA adhesive, hot melt adhesive, etc. The material of this application embodiment is not limited. In addition, an adhesion promoter layer can be added to the upper and lower surfaces of the second adhesive layer 61 to enhance the bonding force between the film structure 2 and the substrate 1 and ensure the connection strength.

[0100] The preceding text mainly described the laminated structure of the exterior structural component 100 in the embodiments of this application. Thickness and material selection will be discussed below. Figure 5 Taking the structure in the example, the possible processing methods of the appearance structural component 100 are illustrated.

[0101] Please see Figures 8 to 9 , Figure 8 This is a schematic diagram of the first processing flow for the appearance structural component according to an embodiment of this application; Figure 9 This is a schematic diagram of the second processing flow for the appearance structural component in an embodiment of this application.

[0102] like Figure 5 As shown, in one possible implementation, the appearance structural component 100 includes, from top to bottom, the following: a first outer texture layer 42 (using AG texture), a protective layer 41 (using PC, PET, PMMA, or composite materials), a first adhesion aid layer 51 (using varnish), a first adhesive layer 52 (using UV adhesive), a second adhesion aid layer 55 (using varnish), an inner texture layer 31 (using cellulose acetate film), a substrate layer 32 (using a cover ink layer 321), a second adhesive layer 61 (using UV adhesive), and a substrate 1.

[0103] like Figure 8 As shown, in one possible implementation, the processing technology of the exterior structural component 100 includes:

[0104] The outer film layer 4 and the first adhesive layer 51 are processed separately, as are the inner film layer 3 and the second adhesive layer 55 (in no particular order).

[0105] The processing of the combination of the outer film layer 4 and the first adhesive layer 51 includes: first, processing a protective layer 41; then, processing the first adhesive layer 51 (by spraying or printing varnish) on one side of the protective layer 41; processing an adhesive layer on the other side of the protective layer 41; and then processing a texture on the adhesive layer using an AG process to form the first outer texture layer 42. The order in which the first adhesive layer 51 and the first outer texture layer 42 are processed on the first protective layer 41 can be interchanged, and this embodiment does not limit this.

[0106] The processing of the combination of the inner film layer 3 and the second adhesion-enhancing layer 55 includes: preparing an inner texture layer 31; then processing the second adhesion-enhancing layer 55 (sprayed or printed varnish) on one side of the inner texture layer 31; and processing a substrate layer 32 (coated with a base ink applied by screen printing or spraying) on ​​the other side of the inner texture layer 31 to provide a base color for the inner texture layer 31. The order in which the second adhesion-enhancing layer 55 and the substrate layer 32 are processed on the inner texture layer 31 can be interchanged, and this embodiment does not limit this.

[0107] The preparation process of the inner texture layer 31 may include: mixing cellulose acetate powder with pigments of different colors, and then proceeding through processes such as batching, kneading, frying, shaping, extrusion, pressing, shaving, baking, and stretching to prepare a cellulose acetate membrane with a relatively large size and thin thickness. Pearl powder (mica powder), glass powder, and other powders may also be added during batching. Pearl powder can cause multiple reflections of light at the interface between mica and metal oxides, producing a soft pearly luster, while glass powder can enhance the film's light reflection effect and increase brightness. Those skilled in the art will understand that the texture on the cellulose acetate membrane mainly depends on the extrusion process. By designing the extrusion die, a membrane material of a specified shape can be extruded, and the target texture is formed through subsequent pressing and stretching. In one possible implementation, a circular die can be used to extrude long strip structures, which are then twisted into a braid and arranged for pressing. The cellulose acetate sheet is then stretched laterally and longitudinally at different stretching ratios, creating a unique cloud-like effect while thinning the membrane.

[0108] The composition of a cover coat ink typically consists of a primer, intermediate coat, and topcoat. The main components are resins such as acrylic and polyurethane. Adding different proportions of pigments, fillers, and additives produces different effects. The primer serves as a corrosion protectant and increases the adhesion between the paint layer and the substrate. The intermediate coat, acting as a middle layer, bonds tightly to the primer while filling in any unevenness, increasing the paint layer thickness, and improving impact resistance and abrasion resistance. The topcoat, by adding colorant, pearlescent powder, and additives, achieves the final visual effect. This application does not limit the specific composition of the cover coat ink.

[0109] After the outer film layer 4 and the first adhesive layer 51, and the inner film layer 3 and the second adhesive layer 55 are processed, they are bonded together using the first adhesive layer 52 to form a film structure 2 blank. In one possible implementation, UV adhesive can be applied once to the second adhesive layer 55 away from the inner texture layer 31. The outer film layer 4 and the first adhesive layer 51 are then placed flat on the inner film layer 3 and the second adhesive layer 55 (the order can be reversed). The UV adhesive between them is then pressed to a uniform thickness using a pressure roller in a transfer device and transferred to an ultraviolet region for photocuring. The above bonding method is merely an example and does not limit the embodiments of this application.

[0110] The blank of the membrane structure 2 is precisely machined using CNC (Computer Numerical Control) and other methods to match its shape with the substrate 1, thus forming the membrane structure 2.

[0111] The membrane structure 2 is adhered to the substrate 1 through the second adhesive layer 6 to form the appearance structural component 100. During the adhesion process, a vacuum bonding device with a contour bonding fixture can be used to expel air between the membrane structure 2 and the substrate 1, reducing defects such as bubbles, fog, filaments, or scorch marks caused by trapped air (air not expelled in time and trapped between the membrane structure 2 and the substrate 1). Specifically, the membrane structure 2 can be aligned and adhered to the substrate 1 using a fixture or manually, followed by hot pressing to pre-activate the adhesive film's adhesion. After the appearance structural component 100 is shaped using a contour fixture, it is placed in a sealed bag for vacuum degassing. Finally, it is placed in an oven to fully activate the adhesive film's adhesion, and baked to obtain the finished product. Because the membrane structure 2 is airtight, direct baking after being adhered to the substrate 1 may cause internal air entrapment, resulting in localized bulges and affecting the product's appearance. Therefore, degassing is necessary before baking to improve the appearance refinement and adhesion reliability of the shell 82. For example, the pressure of the vacuum bonding equipment can be greater than or equal to 0.1 MPa to achieve a better bonding effect. The pressure of the vacuum bonding equipment can also be less than 0.1 MPa, and this application embodiment does not limit this.

[0112] Using the above processing procedure, after the inner membrane layer 3 and the outer membrane layer 4 are bonded together, the membrane structure 2 is then attached to the substrate 1 as a whole, thereby improving the reliability and rigidity of the appearance structural component 100 and achieving a differentiated appearance. By introducing a multi-layered structure and using different materials, colors, or microstructures in each layer, the reflection, refraction, and interference effects of light between different layers are utilized to ultimately present a flowing cloud-like appearance effect.

[0113] like Figure 9 As shown, in one possible implementation, the protective layer 41 and the first adhesive layer 51, as well as the inner texture layer 31 and the second adhesive layer 55, can be fabricated first. After bonding the two together with the first adhesive layer 52, the first outer texture layer 42 and the substrate layer 32 can be fabricated to form the film structure 2 blank. The order in which the first outer texture layer 42 and the substrate layer 32 are fabricated can be interchanged; the attached figure is for illustrative purposes only.

[0114] The exterior structural component 100 may also include more or fewer processing steps, or a certain process or material selection in the above processing steps may be replaced to achieve diverse effects. For example, such as Figure 6As shown, in one possible implementation, the sprayed or printed base ink layer 321 can be replaced with a gradient offset printing layer 322 (which can be achieved using offset printing technology) to achieve a multi-dimensional gradient color effect. Combined with the cloud-like texture of the inner texture layer 31, it enhances the overall sense of layering and visual flow of the appearance structural component 100.

[0115] In one possible implementation, the inner texture layer 31 can be replaced with a TPU film instead of a cellulose acetate film. TPU particles are mixed with color powder and functional additives, and pearl powder (mica powder) and glass powder can also be added. After being heated and plasticized in stages by a single / twin screw extruder, it is extruded from a T-slit die and then cast, cooled, and shaped to obtain the cloud pattern.

[0116] like Figure 6 As shown, a second outer texture layer 43 and a coating layer 44 can also be added below the protective layer 41. The second outer texture layer 43 can be a curved texture, superimposed on the cloud pattern of the inner texture layer 31, enhancing the overall layering of the film and forming a more fluid and delicate cloud pattern appearance. Specific processes may include coating one side of the protective layer 41 with UV adhesive, transferring the pattern on the mold onto the adhesive layer by roller pressing and curing to form the second outer texture layer 43, and then coating the side of the inner texture layer 31 away from the protective layer 41, thereby increasing the light reflectivity of the second inner texture layer 31 and making the cloud pattern present a brighter and more transparent visual effect. In one possible implementation, the composition of the coating layer 44 can be metal compounds such as silicon oxide, niobium oxide, and titanium oxide, and the coating method includes vacuum coating, including evaporation coating, sputtering coating, ion plating, etc., which are not limited in this embodiment.

[0117] Compared to Figure 5 The structure, Figure 6 The differences in the structure shown include: replacing the inner texture layer 31 with a TPU film; adding a second outer texture layer 43 and a coating layer 44 below the protective layer 41; replacing the ink layer of the substrate layer 32 with an offset printing layer 322; and adding a third adhesion promoter layer 323 between the TPU film and the offset printing layer 322 to improve the adhesion of the offset printing ink. This allows for gradient background colors and richer colors, such as white, blue, and yellow, which can cover the color or defects of the substrate 1 itself and improve the overall visual effect of the appearance structural component 100.

[0118] The above description illustrates the implementation of this application through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0119] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0120] The following explains the terminology that may appear in the embodiments of this application.

[0121] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0122] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0123] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An exterior structural component for a terminal device, characterized in that, The exterior structural component includes a substrate and a membrane structure. The substrate has an outer surface, and the membrane structure is covered and fixed to the outer surface of the substrate. The film structure includes an inner film layer and an outer film layer stacked and fixed to each other along the thickness direction of the external structural component. The inner film layer is disposed between the outer film layer and the outer surface of the substrate. The inner film layer includes an inner texture layer, which is configured to have a textured structure. The outer film layer includes a protective layer, which is configured to be transparent.

2. The appearance structural component as described in claim 1, characterized in that, The matrix includes metallic and / or non-metallic portions.

3. The appearance structural component as described in claim 1, characterized in that, The thickness of the inner membrane layer is in the range of 0.07 mm to 0.17 mm, the thickness of the outer membrane layer is in the range of 0.07 mm to 0.24 mm, and the total thickness of the membrane structure is in the range of 0.15 mm to 0.43 mm.

4. The appearance structural component as described in claim 1, characterized in that, The inner texture layer is configured as any one of the following: cellulose acetate film, thermoplastic polyurethane film, or polyurethane film.

5. The appearance structural component as described in claim 1, characterized in that, The protective layer is a polymer film; the transparency of the protective layer is greater than or equal to 50%.

6. The appearance structural component as described in any one of claims 1-5, characterized in that, The outer membrane layer further includes a first outer texture layer, which is disposed on the side of the protective layer opposite to the inner membrane layer and is configured to have a textured structure; The first outer texture layer has a matte structure.

7. The appearance structural component as described in any one of claims 1-5, characterized in that, The outer membrane layer further includes a second outer texture layer, which is disposed on the side of the protective layer near the inner membrane layer and is configured to have a textured structure.

8. The appearance structural component as described in any one of claims 1-5, characterized in that, The outer film layer also includes a coating layer, which is disposed on the side of the protective layer close to the inner film layer.

9. The appearance structural component as described in any one of claims 1-5, characterized in that, The inner film layer further includes a substrate layer, which is disposed on the side of the inner texture layer opposite to the outer film layer and is configured as a colored structure.

10. The appearance structural component as described in claim 9, characterized in that, The substrate layer includes a cover ink layer, or the substrate layer includes an offset printing layer.

11. The appearance structural component as described in any one of claims 1-5, characterized in that, A first adhesive layer is provided between the outer membrane layer and the inner membrane layer, and the two layers are fixedly connected by the first adhesive layer; a second adhesive layer is provided between the membrane structure and the outer surface of the substrate, and the two layers are fixedly connected by the second adhesive layer.

12. The appearance structural component as described in claim 11, characterized in that, The first adhesive layer includes a first adhesive aid layer, a first adhesive layer, and a second adhesive aid layer that are sequentially stacked and fixedly connected along the thickness direction of the external structural component. The first adhesive aid layer is disposed between the outer film layer and the first adhesive layer and is fixedly connected to the side of the outer film layer near the inner film layer. The second adhesive aid layer is disposed between the first adhesive layer and the inner film layer and is fixedly connected to the side of the inner film layer near the outer film layer.

13. The appearance structural component as described in claim 12, characterized in that, The first adhesion promoter layer is made of varnish, and / or the second adhesion promoter layer is made of varnish.

14. The appearance structural component as described in claim 11, characterized in that, The second adhesive layer includes a second adhesive layer, which is configured as an adhesive film or an adhesive layer formed after curing of a flowable adhesive.

15. The appearance structural component as described in any one of claims 1-5, characterized in that, The membrane structure further includes an inner protective membrane layer, which is stacked and fixedly connected between the inner membrane layer and the outer surface of the substrate; The inner protective film layer includes a protective layer, which is configured as a polymer film.

16. The appearance structural component as described in any one of claims 1-5, characterized in that, The external structural component is the housing of the terminal device.

17. A terminal device, characterized in that, The appearance structure includes any one of claims 1 to 16, wherein the surface of the film structure facing away from the substrate constitutes at least a portion of the outer surface of the terminal device.

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