Composite film, case, and electronic device

Abstract

The application provides a composite film, a shell and an electronic device. The composite film comprises a transparent substrate, a skin layer is arranged on one side of the transparent substrate in the thickness direction of the transparent substrate, and the skin layer is a transparent layer; at least one color layer and at least one bottom film layer are arranged on the other side of the transparent substrate in the thickness direction of the transparent substrate, and the at least one color layer is arranged between the transparent substrate and the at least one bottom film layer. The composite film can realize a multi-color gradient effect to improve the aesthetic appearance of the shell.

Description

Technical Field

[0001] This application relates to the field of packaging materials, specifically to a composite film, a housing, and an electronic device. Background Technology

[0002] To meet the diverse aesthetic demands of consumers for consumer electronics, some existing consumer electronics products, such as mobile phones and tablets, already use simulated leather, such as polyurethane (PU) leather, as their back covers. Current PU leather back covers primarily achieve a leather-like effect by coating a colored PU layer onto a substrate and then printing textures onto that PU layer. However, because the color in this type of PU leather back cover comes from the PU layer itself, and the PU layer is limited by its material properties, the resulting colors are limited and cannot achieve gradient colors or specific pattern displays. Therefore, the color and texture effects of current PU leather back covers are relatively limited, failing to meet the demands for differentiated aesthetics. Summary of the Invention

[0003] This application provides a composite film, a housing, and an electronic device, wherein the composite film can achieve a multi-color gradient effect to enhance the aesthetics of the housing.

[0004] In a first aspect, this application provides a composite film comprising a transparent substrate, a textured layer being provided on one side of the transparent substrate in the thickness direction, the textured layer being a transparent layer; and at least one color layer and at least one base film layer being provided on the other side of the transparent substrate in the thickness direction, the at least one color layer being disposed between the transparent substrate and the at least one base film layer.

[0005] The composite film of this application has a transparent textured layer on top of a transparent substrate, giving the composite film a leather-like effect. The color layer is located at the bottom of the transparent substrate, separate from the textured layer and the transparent substrate layer, and is a single, independent layer. In this structure, both the textured layer and the transparent substrate are transparent layers, and the color of the composite film can be displayed by the color layer. The color layer, being a separate layer, is unaffected by the material of the transparent substrate and the textured layer, and can independently form various colors. During manufacturing, different materials can be used to control the color, achieving the desired color rendering effect and avoiding the influence of the transparent substrate and the textured layer. A bottom film layer is placed at the bottom of the color layer, used for color rendering and improving the color rendering effect, and also serves to protect the color layer, preventing delamination and affecting the appearance of the composite film layer.

[0006] In one alternative implementation, the transparent substrate can be a colorless transparent substrate, and the textured layer can be a colorless transparent textured layer, avoiding any influence of the transparent base and textured layer on the final color of the composite film. Additionally, the transparent substrate of this application can possess a certain degree of flexibility to improve the leather-like feel of the composite film and its adhesion to the color layer.

[0007] In one alternative implementation, the thickness of the transparent substrate is 0.1–0.15 mm. The transparent substrate needs to have a certain thickness to provide sufficient strength support for the composite film, but the thickness of the transparent substrate should not be too thick, so as not to increase the overall thickness of the composite film or affect the color development effect of the composite film.

[0008] In one alternative implementation, the transparent substrate is a thermoplastic polyurethane (TPU) substrate. Transparent substrates made of TPU have high flexibility, which improves the leather-like feel of the composite film. Simultaneously, it improves the adhesion between the transparent substrate and the textured and color layers, preventing poor adhesion caused by an overly rigid transparent substrate. Furthermore, using a highly flexible TPU substrate as the transparent substrate allows for greater styling options, such as bending the edges, facilitating the creation of composite films with various shapes.

[0009] In one alternative implementation, the textured layer is an ultraviolet (UV) adhesive layer with a leather-like texture. The UV adhesive layer can be transparent and is easy to coat, cure, and press to create the texture. Simultaneously, the UV adhesive layer exhibits high stability and stain resistance; as the outermost layer of the composite film, it prevents contaminant deposition, protects the transparent substrate of the composite film, and extends its service life. Furthermore, wear-resistant components, such as inorganic oxides, can be added to the UV adhesive layer to improve its wear resistance.

[0010] In one alternative implementation, the thickness of the texture layer is 0.05–0.1 mm. Controlling the thickness of the texture layer within the range of 0.05–0.1 mm facilitates the formation of textures without affecting the visual thickness of the texture layer, thus avoiding a layered effect.

[0011] In one alternative implementation, the color layer is an ink color layer. Ink pigments can achieve a rich variety of color combinations, offer a wide range of colors, and have strong compatibility with other materials, facilitating the selection of transparent substrates. Therefore, using an ink color layer allows for the easy creation of various colors while maintaining high adhesion to the transparent substrate, preventing delamination issues.

[0012] In one optional implementation, the number of color layers is 2 to 6. When the number of color layers is controlled between 2 and 6, the colors are purer, the photosensitivity is better, and different color patterns can be easily formed to enhance the visual effect of the composite film.

[0013] In one alternative implementation, the thickness of each color layer is 8–15 μm. Controlling the thickness of each color layer within the range of 8–15 μm can improve the adhesion between the color layer and other layers, improve the flatness of each color layer, and also avoid the thickness of each color layer being too thick, which would increase the thickness of the composite film.

[0014] In one optional implementation, the number of base film layers is 2 to 4. Since the base film layer is mainly used for color development of the color layer, controlling the number of base film layers to 2 to 4 layers can effectively improve the color development effect of the color layer. The base film layer can be an ink base film layer, which, when combined with the color layer, has better color development and higher adhesion.

[0015] In one alternative implementation, the thickness of each base film layer is 5–10 μm. Controlling the thickness of each base film layer within this range ensures the uniformity of the base film coating and guarantees good color reproduction when combined with the color layer.

[0016] In one alternative implementation, a modification layer is provided between the transparent substrate and the color layer. This modification layer includes one of an ink layer, a pearlescent layer, or a UV layer. By providing a modification layer between the transparent substrate and the color layer, fine textures can be designed and formed in the modification layer to achieve diverse texture effects. Alternatively, the modification layer can be without texture, and its brightness can be increased to further enhance the overall brightness of the composite film, achieving a glossy effect. Furthermore, when the modification layer is an ink layer, such as a magnetic ink layer, it can create visual effects such as gradients or iridescent sheen.

[0017] In one alternative implementation, the thickness of the modification layer is 8–15 μm. Controlling the thickness of the modification layer within the range of 8–15 μm achieves an effective modification effect without affecting the color rendering of the color layer.

[0018] In one optional implementation, a coating layer with a thickness of 100–400 nm is provided between the modification layer and the color layer. By providing the coating layer, the coating layer can be composited with the modification layer, making the texture or brightness of the modification layer more textured, while improving the adhesion strength between the modification layer and the color layer, preventing delamination between the modification layer and the color layer, and improving the stability and reliability of the color rendering effect of the composite film.

[0019] In one alternative implementation, the total thickness of the composite membrane is 200–250 μm. The composite membrane of this application is relatively thin, which meets the demand for thinner and lighter casings.

[0020] The composite film of this application can achieve a leather texture by transferring UV adhesive onto the outer surface of a transparent substrate, while the inner surface has a color layer and a base film layer, thus maintaining the appearance, feel, and visual quality of leather. A pearlescent layer or UV layer can also be printed between the transparent substrate and the color layer to enrich the texture and achieve a comprehensive and innovative aesthetic effect. This method can achieve various colors and precise micro-texture effects based on the feel and appearance of leather, without increasing the overall thickness, maintaining a thin and lightweight profile.

[0021] Secondly, this application provides a method for manufacturing a composite membrane, the method comprising the following steps:

[0022] A textured layer is formed on one side of the transparent substrate, and at least one color layer and at least one base film layer are formed sequentially on the other side of the transparent substrate.

[0023] In the method for manufacturing the composite film of this application, there is no specific limitation on the order of manufacturing the texture layer and the color layer. For example, during the manufacturing process, the texture layer can be manufactured first, followed by the color layer and the base film layer, or the color layer and the base film layer can be manufactured first, followed by the texture layer.

[0024] In one optional implementation, the method for forming the textured layer includes at least one of screen printing, transfer printing, printing, and coating. In another optional implementation, the method for forming the color layer and the base film layer includes at least one of screen printing, printing, and coating.

[0025] In an alternative implementation, the method further includes the steps of forming a modification layer and a coating layer between the transparent substrate and the color layer.

[0026] Thirdly, this application provides a housing that includes the composite membrane of this application.

[0027] In one implementation, the housing may also be a bottom shell, with the composite membrane disposed on the surface of the bottom shell, such as the outer surface.

[0028] The casing of this application, by including the composite film of this application, can have a leather-like texture while presenting richer colors and patterns, thus improving the aesthetics of the casing.

[0029] Fourthly, this application provides an electronic device, which includes the composite film of this application or the housing of this application.

[0030] The technical effects that can be achieved by the second to fourth aspects mentioned above can be referred to the corresponding effect descriptions in the first aspect mentioned above, and will not be repeated here.

[0031] In this application, the data in the various possible implementations, such as the thickness of the texture layer, the thickness of the transparent substrate, the thickness of the color layer, the thickness of the base film layer, the thickness of the modification layer, and the thickness of the coating layer, should be understood as being within the range defined in this application, provided that the values ​​are within the engineering measurement error range. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a composite membrane structure according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a composite membrane according to another embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a composite membrane according to another embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the housing structure according to one embodiment.

[0036] Figure label:

[0037] 10-Composite membrane;

[0038] 11-Transparent substrate; 12-Texture layer; 13-Color layer; 14-Base film layer; 15-Finishing layer; 16-Coating layer;

[0039] 21-Bottom shell; 22-Film layer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0041] Currently, the imitation leather back covers used in consumer electronics products are mainly made of PU leather. This is achieved by coating a substrate with a colored PU layer and then pressing a leather texture onto the PU layer. However, existing PU leather only comes in a limited range of colors, failing to meet the demand for diverse patterns and a wider variety of colors.

[0042] Based on this, this application provides a composite film. The composite film of this application achieves richer color effects by setting a separate color layer, thus freeing it from the limitations of other layers.

[0043] Figure 1 This is a schematic diagram of the structure of a composite membrane according to one embodiment. Figure 1 As shown, the composite film 10 of this application embodiment includes a textured layer 12, a transparent substrate 11, at least one color layer 13, and at least one base film layer 14 stacked sequentially.

[0044] The transparent substrate 11 provides basic structural support for the composite film 10. The transparent substrate 11 can be a colorless transparent substrate made of plastic material, with a light transmittance of 80% or higher, or even 85% or higher, or even 90% or higher. The transparent substrate 11 is a single layer, with a thickness of 0.1 to 0.15 mm. This thickness of transparent substrate 11 provides high light transmittance while meeting basic strength requirements. For example, the thickness of the transparent substrate 11 can be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, or any two of these values. These values ​​can be considered as the lower limit or upper limit of the thickness range of the transparent substrate 11.

[0045] As an example, the transparent substrate 11 may be thermoplastic polyurethane elastomer (TPU), polycarbonate (PC), polyethylene glycol terephthalate (PET), transparent nylon, acrylonitrile-styrene copolymer (AS), etc.

[0046] In one specific embodiment, the transparent substrate 11 is a TPU substrate. The transparent substrate 11, made of TPU material, has high flexibility, which improves the leather-like feel of the composite film. Simultaneously, it improves the adhesion between the transparent substrate 11 and the textured layer 12 and the color layer 13, preventing poor adhesion caused by an overly rigid transparent substrate 11. Furthermore, using a highly flexible TPU substrate as the transparent substrate 11 allows for more diverse shaping effects; for example, the edges of the transparent substrate 11 can be bent, facilitating the fabrication of composite films with various shapes.

[0047] by Figure 1 Taking the indicated direction as an example, the texture layer 12 is located on the outer surface of the transparent substrate 11 and serves as the outer layer of the composite film 10. The texture layer 12 has a leather-like texture, which can be formed by pressing. The texture layer 12 is a transparent layer and can be colorless. The texture layer 12 can also be a UV adhesive layer. Using a UV adhesive layer as the texture layer 12, it can be formed by transfer printing. During the transfer process, the leather-like texture can be formed directly. The UV adhesive layer is easy to cure; after the transfer is completed, it can be cured by irradiating with UV light. After curing, the UV adhesive layer has high stability and can prevent moisture erosion, thereby protecting the anti-aging properties of the transparent substrate 11.

[0048] To achieve an effective texture effect, the thickness of the texture layer 12 can be 0.05–0.1 mm. Controlling the thickness of the texture layer 12 within this range allows for a better-looking texture without excessively increasing the thickness of the composite film 10. Combined with the transparent substrate 11, it provides a soft leather-like texture and a tactile feel. For example, the thickness of the texture layer 12 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, or any two of these values. These values ​​can be considered as the lower limit or upper limit of the thickness range of the texture layer 12.

[0049] Since the textured layer 12 is located on the outermost layer of the composite film 10, to improve its dustproof performance, a certain amount of anti-fouling components, such as silicone-based polyurethane, can be added to the forming material of the textured layer 12, such as the UV adhesive. After adding the anti-fouling components, the textured layer 12 can exhibit a textured effect while also possessing a certain degree of anti-fouling properties, thus serving as an anti-fouling layer. In addition, wear-resistant components, such as inorganic oxide particles, can be added to the UV adhesive layer to improve its wear resistance. The particle size of the added wear-resistant components can be controlled at the nm level to avoid affecting the light transmittance of the textured layer.

[0050] Continue to refer to Figure 1 To achieve the color effect of the composite film 10, a color layer 13 can be provided on the inner surface of the transparent substrate 11. The color layer 13 can be formed on the inner surface of the transparent substrate 11 by printing. Since the color layer 13 is a separate layer structure, it is not limited by the transparent substrate 11 and the texture layer 12, and various colors and patterns can be formed.

[0051] The textured layer 12 provides a leather-like effect, while the transparent substrate 11 provides a base support; both are transparent layers. The pattern and color formed by the color layer 13 are visible through the transparent substrate 11 and the textured layer 12. The color layer 13 can be an ink color layer, whose main components include pigments, binders, fillers, and various additives. The color layer 13 is formed using an ink pigment layer, which facilitates printing and coating. Furthermore, the ink pigment layer can form good adhesion with transparent substrates 11 of various materials. The color layer 13 can achieve different colors by adding different colored pigments to the ink, facilitating the production of different color layers.

[0052] Color layer 13 shall be at least one layer, and may also be a combination of two or more layers. Figure 1In the structure shown, the color layer 13 consists of two layers. When the color layer 13 is multi-layered, the multiple color layers 13 are stacked together. In one embodiment, the composite film 10 has 2 to 6 color layers 13. Having 2 to 6 color layers 13 improves the purity of the color layers and allows for the formation of various color combinations or patterns to meet the needs of color rendering. Exemplarily, the number of color layers 13 can be 2, 3, 4, 5, or 6. The number of color layers 13 can be set according to the specific color rendering effect.

[0053] The thickness of each color layer 13 can be 8–15 μm to achieve better color rendering. Furthermore, when the thickness of each color layer 13 is 8–15 μm, multiple layers of color layers 13 can be stacked to create colorful and complex patterns while reducing the total thickness of the color layers 13. For example, the thickness of each color layer 13 can be 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, or any two of these values. These values ​​can be used as the lower limit or upper limit of the thickness range of the color layer 13.

[0054] Continue to refer to Figure 1 To achieve color development and fixation of the color layer 13, a base film layer 14 is provided at the bottom of the color layer 13. The base film layer 14 can be an ink cap bottom layer to bond with the ink color layer, making the color development of the ink color layer purer. In addition, the ink cap bottom layer has a higher adhesion to the ink color layer and can be bonded to the ink color layer by printing or coating. The color of the base film layer 14 can be black. The color layer 13 is disposed between the base film layer 14 and the transparent substrate 11. The base film layer 14 can be at least one layer, or it can be two or more layers. Figure 1 In the illustrated embodiment, the bottom film layer 14 has two layers. In one embodiment, the bottom film layer 14 may have 2 to 4 layers. The thickness of each bottom film layer 14 may be 5 to 10 μm. Exemplarily, the thickness of each bottom film layer 14 may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or any two of these values. The values ​​listed above can be used as the lower limit or the upper limit of the thickness range of the bottom film layer 14.

[0055] The composite film of this embodiment, due to the layered arrangement of the texture layer 12 and the color layer 13, allows for flexibility in the arrangement of the color layer 13, thereby enriching the colors and patterns of the composite film 10. Figure 1Taking the composite film shown as an example, by combining the above layers, a composite film 10 with a leather-like texture and diverse colors and patterns can be obtained. The total thickness of the composite film 10 can be 200–250 μm. The composite film 10 of this application is relatively thin, which meets the demand for thinner and lighter housings.

[0056] In this embodiment of the composite film 10, during manufacturing, a leather texture can be achieved by transferring UV adhesive onto the outer surface of a transparent substrate 11, while the inner surface color layer 13 and base film layer 14 maintain the appearance, feel, and visual quality of leather. The method for forming the leather texture layer includes, but is not limited to, at least one of screen printing, transfer printing, printing, and coating. Similarly, the methods for forming the color layer and base film layer include, but are not limited to, at least one of screen printing, transfer printing, printing, and coating.

[0057] For example, Figure 1 The method for manufacturing the composite membrane in the illustrated embodiment may include the following steps:

[0058] Step S11: Transfer a UV adhesive layer to one side of the transparent substrate 11 and press a leather texture to form a leather texture layer 12, and then apply a protective film to the surface of the leather texture layer 12.

[0059] Step S12: Print an ink color layer 13 on the other side of the transparent substrate 11;

[0060] Step S13: Print ink base film layer 14 on the surface of ink color layer 13.

[0061] The texture is achieved by transferring a UV adhesive layer onto the outer surface of the TPU substrate, and the color is achieved by printing a color layer on the inner side of the TPU substrate, resulting in a greater variety of color effects.

[0062] To achieve better color rendering and texture, this application also provides another composite film.

[0063] Figure 2 This is a schematic diagram of the structure of a composite membrane according to another embodiment of this application. Figure 2 As shown, the composite film 10 includes a textured layer 12, a transparent substrate 11, a decorative layer 15, a color layer 13, and a base film layer 14, which are sequentially stacked. The textured layer 12, transparent substrate 11, color layer 13, and base film layer 14 are... Figure 1 The texture layer 12, transparent substrate 11, color layer 13 and bottom film layer 14 in the illustrated embodiment are the same, and will not be described again here.

[0064] Reference Figure 2A modification layer 15 is disposed between the transparent substrate 11 and the color layer 13. The modification layer 15 can be a pearlescent layer, such as a pearlescent PU paint layer. When the modification layer is a pearlescent layer, it can enhance the overall brightness of the composite film. The modification layer 15 can be a single layer with a thickness of 8–15 μm. Since the modification layer 15 is disposed on top of the color layer 13, it can be a transparent layer to avoid affecting the display of the color layer 13. Alternatively, in another embodiment, the modification layer 15 can also be an ink layer, such as a magnetic ink layer. The ink layer can display gradient colors or iridescent colors to form a gradient color coating or an iridescent coating, thereby increasing the cool display effect of the composite film.

[0065] Figure 2 The fabrication process of the composite membrane in the illustrated embodiment may include the following steps:

[0066] Step S21: Transfer a UV adhesive layer onto one side of the transparent substrate 11 and press a leather texture to form a leather texture layer 12, and then attach a protective film to the surface of the leather texture layer 12.

[0067] Step S22: Print a pearlescent layer on the other side of the transparent substrate 11 to form a decorative layer 15;

[0068] Step S23: Print ink color layer 13 on the surface of the finishing layer 15;

[0069] Step S24: Print ink base film layer 14 on the surface of ink color layer 13.

[0070] Figure 3 This is a schematic diagram of the structure of a composite membrane according to another embodiment of this application. Figure 3 As shown, the composite film 10 includes a textured layer 12, a transparent substrate 11, a modification layer 15, a coating layer 16, a color layer 13, and a base film layer 14, which are sequentially stacked. The textured layer 12, transparent substrate 11, color layer 13, and base film layer 14 are... Figure 1 The texture layer 12, transparent substrate 11, color layer 13 and bottom film layer 14 in the illustrated embodiment are the same, and will not be described again here.

[0071] exist Figure 3 In the illustrated embodiment, the modification layer 15 can be a pearlescent layer or an ink layer, or it can be a UV layer with fine texture. When the modification layer is a UV layer with fine texture, a finer texture layer different from the leather texture layer 12 can be pressed into the UV layer, which improves the visual appearance and texture of the composite film, making its leather texture effect more realistic, and enriching the diversity of the texture effect of the composite film.

[0072] Continue to refer to Figure 3When the modification layer 15 is a UV layer with fine texture, a coating layer 16 can also be disposed between the modification layer 15 and the color layer 13. The coating layer 16 can work together with the modification layer 15 to highlight the texture in the modification layer 15, making the fine texture of the modification layer 15 more visible. Furthermore, the coating layer 16 can help improve the adhesion strength between the modification layer 15 and the color layer 13, preventing delamination. The coating layer 16 can be a single layer. Since the coating layer 16 is also disposed on top of the color layer 13, the coating layer 16 also needs to be a colorless and transparent layer. For example, the coating layer 16 can be a non-conductive electroplated film layer, and its main components can include SiO2, Nb2O5, TiO2, etc. It is mainly used to improve the quality of the micro-texture of the modification layer.

[0073] By superimposing a pearlescent layer or a combination of a UV layer and a coating layer on the inner side of a transparent substrate 11, such as a TPU substrate, the composite film can achieve more precise micro-texture effects and a high-gloss quality, while still possessing a leather-like tactile and visual effect.

[0074] For example, Figure 3 The fabrication process of the composite membrane in the illustrated embodiment may include the following steps:

[0075] Step S1: Transfer a UV adhesive layer to one side of the transparent substrate 11 and press the leather texture to form a leather texture layer 12, and then apply a protective film to the surface of the leather texture layer 12.

[0076] Step S2: Print a UV layer on the other side of the transparent substrate 11 to form a decorative layer 15;

[0077] Step S3: A coating layer 16 is formed by depositing a film on the surface of the modification layer 15;

[0078] Step S4: Print ink color layer 13 on the surface of coating layer 16;

[0079] Step S5: Print the ink base film layer 14 on the surface of the ink color layer 13.

[0080] in, Figure 2 and Figure 3 In the composite film with the structure shown, when the modification layer 15 is included, the modification layer 15 can be in direct contact with the transparent substrate 11, or an adhesive layer can be added between the transparent substrate 11 and the modification layer 15 to improve the adhesion between the transparent substrate 11 and the modification layer 15.

[0081] Figure 2 and Figure 3In the composite film shown, the addition of the modification layer 15 and the coating layer 16 allows for the creation of more intricate micro-texture effects and a high-gloss finish, building upon the tactile and visual appeal of leather. This enriches the overall appearance and achieves a comprehensive and innovative aesthetic. Therefore, the composite film of this embodiment can achieve various color and intricate micro-texture effects while maintaining a thin and light profile, without increasing the overall thickness.

[0082] The composite film provided in this application is an innovative composite film with the appearance and feel of leather. By transferring a UV adhesive layer onto the front surface of a TPU substrate to achieve a leather texture, printing a color layer and a base film layer on the inner side, and optionally adding a finishing layer and a coating layer, a comprehensive and innovative appearance effect with diverse colors and patterns is achieved while maintaining the leather-like feel and appearance. Furthermore, by adding a pearlescent layer or a UV layer as a finishing layer and adding a coating layer, the overall texture can be enriched.

[0083] The composite film of this application embodiment can be used in the housing of electronic devices. The composite film can be used directly as a soft shell for electronic devices, or as an outer covering film for the housing, giving the electronic device housing a colorful leather-like appearance.

[0084] Figure 4 This is a schematic diagram of the structure of a housing according to one embodiment. The housing includes a bottom shell 21 and a composite film 10 according to this embodiment. The composite film 10 is disposed on the surface of the bottom shell 21. The composite film 10 is fixed to the bottom shell 21 by means including, but not limited to, bonding, snap-fitting, etc. The bottom film layer 14 of the composite film 10 is connected to the bottom shell 21, and the textured layer 12 of the composite film 10 is located on the outermost side, forming the outer surface of the housing. The bottom shell 21 and the composite film 10 can be bonded together by an adhesive film layer 22. When the bottom shell 21 and the composite film 10 are bonded together by the adhesive film layer 22, the thickness of the adhesive film layer 22 can be 0.05 to 0.1 mm to ensure sufficiently high bonding strength between the bottom shell 21 and the composite film 10. When the bottom shell 21 and the composite film 10 are connected by a non-bonded method such as compression or snap-fitting, the adhesive film layer 22 may not be provided between the bottom shell 21 and the composite film 10.

[0085] The bottom shell 21 can be made of fiberboard, such as fiberglass board or aramid fiberboard. The thickness of the bottom shell 21 can be 0.2 to 0.5 mm. During the manufacturing of the shell, the composite film 10 can be directly bonded to the bottom shell 21 or formed by integral molding process.

[0086] The housing formed using the composite film of the present application embodiment can achieve various colors, patterns, and fine micro-texture display effects based on the tactile and visual effects of leather, without increasing the overall thickness, thus keeping the housing thin and light.

[0087] For the same technical purpose, this application also provides an electronic device. This electronic device includes the composite film described in this application.

[0088] For the same technical purpose, this application also provides an electronic device. This electronic device may include the housing described in this application.

[0089] The electronic devices in this application include, but are not limited to, consumer electronic devices, such as mobile phones, tablets, laptops, and watches.

[0090] The terminology used in the above embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0091] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0092] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology 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. A composite membrane, characterized in that, The material includes a transparent substrate, a textured layer on one side of the transparent substrate in the thickness direction, the textured layer being a transparent layer; and at least one color layer and at least one base film layer on the other side of the transparent substrate in the thickness direction, the at least one color layer being disposed between the transparent substrate and the at least one base film layer.

2. The composite membrane according to claim 1, characterized in that, The thickness of the transparent substrate is 0.1 to 0.15 mm.

3. The composite membrane according to claim 1 or 2, characterized in that, The transparent substrate is a TPU substrate.

4. The composite membrane according to any one of claims 1-3, characterized in that, The textured layer is a UV adhesive layer, and the UV adhesive layer has a textured surface.

5. The composite membrane according to any one of claims 1-4, characterized in that, The thickness of the textured layer is 0.05–0.1 mm.

6. The composite membrane according to any one of claims 1-5, characterized in that, The color layer is an ink color layer.

7. The composite membrane according to any one of claims 1-6, characterized in that, The number of color layers is 2 to 6.

8. The composite membrane according to any one of claims 1-7, characterized in that, The thickness of each color layer is 8–15 μm.

9. The composite membrane according to any one of claims 1-8, characterized in that, The number of layers in the bottom film layer is 2 to 4.

10. The composite membrane according to any one of claims 1-9, characterized in that, The thickness of each of the bottom film layers is 5–10 μm.

11. The composite membrane according to any one of claims 1-10, characterized in that, A modification layer is provided between the transparent substrate and the color layer, and the modification layer includes either a pearlescent layer or a UV layer.

12. The composite membrane according to claim 11, characterized in that, The thickness of the modified layer is 8–15 μm.

13. The composite membrane according to claim 11 or 12, characterized in that, A coating layer is provided between the modification layer and the color layer, and the thickness of the coating layer is 100-400 nm.

14. The composite membrane according to any one of claims 1-13, characterized in that, The total thickness of the composite membrane is 200–250 μm.

15. A method for producing a composite membrane as described in any one of claims 1-14, characterized in that, include: A textured layer is formed on one side surface of the transparent substrate, and at least one color layer and at least one base film layer are sequentially formed on the other side surface of the transparent substrate.

16. The method according to claim 15, characterized in that, The method for forming the textured layer includes at least one of screen printing, transfer printing, printing, and coating. The methods for forming the color layer and the base film layer include at least one of screen printing, transfer printing, printing, and coating.

17. The method according to claim 15 or 16, characterized in that, The method further includes the steps of forming a modification layer and a coating layer between the transparent substrate and the color layer.

18. A housing, characterized in that, Includes the composite membrane as described in any one of claims 1-14.

19. The housing according to claim 18, characterized in that, The housing includes a bottom shell, and the composite membrane is disposed on the surface of the bottom shell.

20. An electronic device, characterized in that, The electronic device includes a composite membrane as described in any one of claims 1-14; or, the electronic device includes a housing as described in claim 18 or 19.

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