Shell of electronic device and manufacturing method for shell, and electronic device

Abstract

The present application relates to the technical field of electronic products. Provided are a shell of an electronic device, a manufacturing method for the shell, and an electronic device. In the shell, a cellulose acetate membrane and a protective layer are sequentially provided on the inner surface of a substrate, wherein the cellulose acetate membrane can endow the shell with unique textures and luster. By setting the substrate and the protective layer to be a polycarbonate layer, a polymethyl methacrylate layer or a composite board formed by compositing polycarbonate and polymethyl methacrylate, the substrate and the protective layer are both made of plastics, such that the manufacturing cost of the shell can be reduced, thereby saving on the production cost of the whole electronic device. In addition, by sandwiching the cellulose acetate membrane between the matrix and the protective layer, the cellulose acetate membrane can be protected from both sides, and gaps in both sides of the cellulose acetate membrane can be reduced, thereby enhancing the compactness of the shell. Furthermore, the waterproof performance of the shell is improved, and the reliability of the shell and the whole electronic device is improved.

Description

Electronic device shell, manufacturing method thereof, and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410775896.4, filed on June 14, 2024, and entitled "Electronic device shell, manufacturing method thereof, and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic products, in particular to an electronic device shell, a manufacturing method thereof, and an electronic device. BACKGROUND

[0003] The shell of an electronic device is mainly made of metal, glass, plastic or ceramic. As the signal transmission capability of a metal shell is limited, with the advent of the 5G era, more and more manufacturers choose glass or plastic with strong signal transmission capability to make the shell.

[0004] In order to present a better appearance effect, the shell of some electronic devices adopts glass as the base body, and an optically clear adhesive (OCA) is used to attach an acetate film to the inner surface of the glass, so as to inject natural mineral powder into the shell through the acetate film, and give the shell a unique texture and luster. An ink layer is provided on the acetate film as the cover bottom layer of the shell. A coating layer, a UV texture layer and other structure layers can also be provided between the cover bottom layer and the acetate film to enhance the color effect of the shell.

[0005] However, the existing shell of an electronic device has high manufacturing cost, and some also have poor waterproof performance and affect the texture effect of the acetate film. SUMMARY

[0006] The present application provides an electronic device shell, a manufacturing method thereof, and an electronic device. The shell of the electronic device has a texture and luster, and has low manufacturing cost, good waterproof performance, good appearance effect, low cost and high reliability.

[0007] The first aspect of the present application provides an electronic device shell, comprising: a base body comprising an outer surface and an inner surface arranged oppositely; the base body is a polycarbonate layer, a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate; an acetate film arranged on the side where the inner surface of the base body is located; a protective layer arranged on the side of the acetate film away from the base body; the protective layer is a polycarbonate layer, a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate.

[0008] The shell of the electronic device of the present application takes the base as the main support structure, the outer surface of the base faces the outside world, the inner surface of the base faces the inside of the electronic device, and the inner surface of the base is sequentially provided with an acetate film and a protective layer. By adding an acetate film in the shell, the acetate film can give the shell a unique texture and luster. By setting the base and the protective layer as a polycarbonate layer, a polymethyl methacrylate layer, or a composite board composed of polycarbonate and polymethyl methacrylate, both the base and the protective layer are made of plastic, which can reduce the manufacturing cost of the shell and thus save the production cost of the entire electronic device. Moreover, by sandwiching the acetate film between the base and the protective layer, the acetate film can be protected from both sides, and the voids on both sides of the acetate film can be reduced, and the density of the acetate film on both sides can be enhanced. Furthermore, the waterproof performance of the shell can be improved, the appearance effect of the shell can be prevented from being affected by water absorption of the acetate film, and the reliability of the shell and the entire electronic device can be improved.

[0009] In a possible implementation, a first glue layer is arranged between the base and the acetate film, and a second glue layer is arranged between the protective layer and the acetate film.

[0010] The first glue layer and the second glue layer respectively bond the base and the protective layer to the two sides of the acetate film, ensuring the connection strength of the base, the acetate film, and the protective layer. Moreover, the acetate film is clamped by the first glue layer and the second glue layer, and the base and the protective layer are both high-density structural parts, which can reduce the voids on both sides of the acetate film, ensure the density of the acetate film on both sides, improve the waterproof performance of the shell, prevent water from entering the acetate film, and ensure the appearance effect of the shell.

[0011] In a possible implementation, at least one of the first glue layer and the second glue layer is a UV glue layer.

[0012] By setting at least one of the first glue layer and the second glue layer as a UV glue layer, the curing method of the UV glue is simple, the curing speed is fast, and the cost is low, which can improve the manufacturing efficiency of the shell and reduce the manufacturing cost of the shell.

[0013] In a possible implementation, the thickness of the base ranges from 0.30 mm to 0.45 mm, and the thickness of the protective layer ranges from 0.05 mm to 0.15 mm.

[0014] By setting the thickness of the base layer to be between 0.03mm and 0.45mm, the base layer has sufficient thickness to meet the structural strength requirements of the base layer. Moreover, the thickness of the base layer is not too large, which can reduce the thickness of the shell. By setting the thickness of the protective layer to be between 0.05mm and 0.15mm, the thickness of the protective layer is not too small, and the protective layer has sufficient structural strength and stability to support the acetate film and prevent external moisture from entering the acetate film. Moreover, the thickness of the protective layer is smaller than the thickness of the base layer, which can reduce the overall thickness of the shell.

[0015] In a possible implementation, the thickness of the acetate film ranges from 0.05mm to 0.15mm.

[0016] By setting the thickness of the acetate film to be between 0.05mm and 0.15mm, the acetate film has a certain thickness, which can ensure the structural strength and stability of the acetate film, ensure the texture effect and gloss of the acetate film, and avoid the influence of other structural layers on the appearance effect of the shell. Moreover, the thickness of the acetate film is relatively small, which can avoid the influence of the acetate film being too thick on the structural strength of the shell.

[0017] In a possible implementation, the shell of the electronic device further includes a cover bottom layer disposed on the side of the protective layer away from the acetate film.

[0018] By disposing the cover bottom layer on the side of the protective layer away from the acetate film, the cover bottom layer can be located on the side surface of the shell facing the inside of the electronic device. The cover bottom layer serves as the inner surface layer of the shell, which is usually an ink layer printed or sprayed, and can protect the shell from being scratched or marred by the structural layers below.

[0019] In a possible implementation, the shell of the electronic device further includes at least one plating layer disposed between the cover bottom layer and the protective layer.

[0020] By disposing at least one plating layer between the cover bottom layer and the protective layer, the hardness, oxidation resistance, durability, and heat dissipation performance of the shell can be enhanced. Thus, the stability and reliability of the shell are improved, and the service life of the shell is prolonged.

[0021] In a possible implementation, the at least one plating layer includes a silicon oxide layer attached to the cover bottom layer and a zirconium oxide layer disposed between the silicon oxide layer and the protective layer.

[0022] In a possible implementation, an ink layer is disposed between the silicon oxide layer and the zirconium oxide layer.

[0023] In a possible implementation, the shell of the electronic device further includes a UV texture layer disposed between the protective layer and the plating layer.

[0024] By setting the UV texture layer between the protective layer and the coating layer, the UV texture layer can be formed on the protective layer by the UV transfer printing method. In this way, the adhesion between the coating layer and the protective layer can be enhanced, and the integrity and reliability of the shell can be improved. In some cases, the UV texture layer can also be superimposed with the texture effect of the acetate film, which can improve the appearance effect of the shell.

[0025] In a possible implementation, the shell of the electronic device further includes: a reinforcing layer, disposed on the outer surface of the base body.

[0026] By setting the reinforcing layer on the outer surface of the base body, the reinforcing layer serves as the outer surface layer of the shell and is mainly used for hardening treatment of the outer surface of the shell to enhance the hardness and wear resistance of the shell. Thus, the stability and reliability of the shell are improved, and the service life of the shell is prolonged.

[0027] A second aspect of the present application provides a manufacturing method of a shell of an electronic device, including: providing a base body and an acetate film, and connecting the inner surface of the base body and the acetate film; providing a protective layer, and connecting the protective layer to the side surface of the acetate film away from the base body; wherein the base body and the protective layer are respectively a polycarbonate layer, a polymethyl methacrylate layer, or a composite board composed of polycarbonate and polymethyl methacrylate.

[0028] The manufacturing method of the shell of the present application provides the base body, the acetate film, and the protective layer, connects the inner surface of the base body and the acetate film, and connects the protective layer to the side surface of the acetate film away from the base body. By adding the acetate film to the shell, the acetate film can give the shell a unique texture and luster. By setting the base body and the protective layer as a polycarbonate layer, a polymethyl methacrylate layer, or a composite board composed of polycarbonate and polymethyl methacrylate, the base body and the protective layer are both made of plastic, which can reduce the manufacturing cost of the shell and thus save the production cost of the entire electronic device. Moreover, by sandwiching the acetate film between the base body and the protective layer, the acetate film can be protected from both sides, which is conducive to reducing the gap on both sides of the acetate film and enhancing the compactness of the acetate film on both sides. Thus, the waterproof performance of the shell is improved, the appearance effect of the shell is prevented from being affected by water absorption of the acetate film, and the reliability of the shell and the entire electronic device is improved.

[0029] In a possible implementation, connecting the base body and the acetate film includes: forming a first glue layer on the surface of one of the base body and the acetate film; connecting the base body and the acetate film through the first glue layer; and / or connecting the protective layer to the side surface of the acetate film away from the base body includes: forming a second glue layer on the side surface of the acetate film away from the base body; and connecting the protective layer to the side surface of the acetate film away from the base body through the second glue layer.

[0030] In a possible implementation, when the base body is a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate, and the first adhesive layer is a UV adhesive layer, the base body and the cellulose acetate film are connected by the first adhesive layer, comprising: arranging a UV lamp on the side where the cellulose acetate film is located, so that the UV light emitted by the UV lamp passes through the cellulose acetate film to the first adhesive layer to cure the first adhesive layer.

[0031] When the first adhesive layer is a UV adhesive layer, the first adhesive layer needs to be cured by UV light. When the base body is a polymethyl methacrylate layer or a composite board, the cellulose acetate film has a higher transmittance to UV light than the base body. By arranging the UV lamp on the side where the cellulose acetate film is located, the UV light emitted by the UV lamp passes through the cellulose acetate film to the first adhesive layer. This ensures the absorption rate of the first adhesive layer to the UV light and guarantees the complete curing of the first adhesive layer.

[0032] In a possible implementation, when the protective layer is a polycarbonate layer and the second adhesive layer is a UV adhesive layer, the protective layer is attached to the surface of the cellulose acetate film away from the base body, comprising: arranging a UV lamp on the side where the protective layer is located, so that the UV light emitted by the UV lamp passes through the protective layer to the second adhesive layer to cure the second adhesive layer.

[0033] When the second adhesive layer is a UV adhesive layer, the second adhesive layer needs to be cured by UV light. When the protective layer is a polycarbonate layer, the protective layer has a high transmittance to UV light. By arranging the UV lamp on the side where the protective layer is located, the UV light passes through the protective layer to the second adhesive layer. This ensures the absorption rate of the second adhesive layer to the UV light and guarantees the complete curing of the second adhesive layer. Moreover, the structure layer penetrated by the UV light is less, the absorption rate of the second adhesive layer to the UV light is fast, and the curing rate of the second adhesive layer is high.

[0034] In a possible implementation, when the base body is a polycarbonate layer, the protective layer is a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate, and the second adhesive layer is a UV adhesive layer, the protective layer is attached to the surface of the cellulose acetate film away from the base body, comprising: arranging a UV lamp on the side where the base body is located, so that the UV light emitted by the UV lamp passes through the base body, the first adhesive layer and the cellulose acetate film in sequence to the second adhesive layer to cure the second adhesive layer.

[0035] When the second adhesive layer is a UV adhesive layer, the second adhesive layer needs to be cured by UV light. When the base body is a polycarbonate layer and the protective layer is a polymethyl methacrylate layer or a composite board, the base body has a higher transmittance to UV light than the protective layer. By arranging the UV lamp on the side where the base body is located, the UV light passes through the base body, the first adhesive layer and the cellulose acetate film in sequence to the second adhesive layer. This ensures the absorption rate of the second adhesive layer to the UV light and guarantees the complete curing of the second adhesive layer.

[0036] In a possible implementation, the method further includes: forming a cover bottom layer on the side of the protective layer away from the cellulose acetate film.

[0037] In a possible implementation, the method further includes: forming at least one plating layer between the cover bottom layer and the protective layer.

[0038] In a possible implementation, the method further includes: forming a UV texture layer between the protective layer and the plating layer.

[0039] In a possible implementation, the method further includes: forming a reinforcing layer on the outer surface of the base body.

[0040] A third aspect of the present application provides an electronic device, which includes a display screen and the shell as described above, and the display screen is mounted on the shell.

[0041] The electronic device of the present application includes a shell and a display screen mounted on the shell, the shell takes a base body as a main support structure, an outer surface of the base body faces the outside world, an inner surface of the base body faces the inside of the electronic device, and the inner surface of the base body is sequentially provided with a cellulose acetate film and a protective layer. By adding the cellulose acetate film in the shell, the cellulose acetate film can give the shell a unique texture and luster. By setting the base body and the protective layer as a polycarbonate layer, a polymethyl methacrylate layer, or a composite board composed of polycarbonate and polymethyl methacrylate, the base body and the protective layer are both made of plastic, which can reduce the production cost of the shell and further save the production cost of the whole electronic device. Moreover, by sandwiching the cellulose acetate film between the base body and the protective layer, the cellulose acetate film can be protected from both sides, and it is beneficial to reduce the gap on both sides of the cellulose acetate film and enhance the compactness on both sides of the cellulose acetate film. Furthermore, the waterproof performance of the shell is improved, the appearance effect of the shell is prevented from being affected by water absorption of the cellulose acetate film, and the reliability of the shell and the whole electronic device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] FIG. 1 is a structural schematic diagram of an electronic device provided by an embodiment of the present application;

[0043] FIG. 2 is an exploded structural diagram of the electronic device shown in FIG. 1;

[0044] FIG. 3 is a structural schematic diagram of another electronic device provided by an embodiment of the present application;

[0045] FIG. 4 is a structural schematic diagram of the electronic device in FIG. 3 in a folded state;

[0046] FIG. 5 is a structural schematic diagram of the electronic device in FIG. 3 in an unfolded state;

[0047] FIG. 6 is an exploded structural diagram of the electronic device in FIG. 3;

[0048] FIG. 7 is a structural schematic diagram of a first shell according to an embodiment of the present application;

[0049] FIG. 8 is a structural schematic diagram of a second shell according to an embodiment of the present application;

[0050] FIG. 9 is a structural schematic diagram of a third shell according to an embodiment of the present application;

[0051] FIG. 10 is a structural schematic diagram of a fourth shell according to an embodiment of the present application;

[0052] FIG. 11 is a structural schematic diagram of a fifth shell according to an embodiment of the present application;

[0053] FIG. 12 is a step flow chart of a manufacturing method of a shell according to an embodiment of the present application.

[0054] Legend: 10-electronic device; 100-display screen; 200-shell; 300-circuit board; 400-battery; 500-camera; 110-foldable screen; 120-straight screen; 210-first shell; 220-second shell; 230-rotation shaft mechanism; 111-first non-bending part; 112-bendable part; 113-second non-bending part; 201-middle frame; 202-back cover; 2001-base body; 2002-acetate film; 2003-protection layer; 2004-first glue layer; 2005-second glue layer; 2006-cover bottom layer; 2007-strengthening layer; 2008-coating layer; 2009-ink layer; 2010-UV texture layer; 20081-silicon oxide layer; 20082-zirconium oxide layer; a-polycarbonate layer; b-polymethyl methacrylate layer. DETAILED DESCRIPTION

[0055] The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0056] The electronic device can be a consumer electronic product. For example, the electronic device includes, but is not limited to, a mobile phone, a tablet computer (PAD), a notebook computer, a laptop computer, a netbook, an ultra-mobile personal computer (UMPC), a walkie-talkie, a POS (Point of sales) machine, a personal digital assistant (PDA), a multimedia player, an e-book reader, an in-vehicle device, a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, and the like. The wearable device includes, but is not limited to, a smart bracelet, a smart watch, a smart head-mounted display, smart glasses, and the like.

[0057] FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application. Referring to FIG. 1, an electronic device 10 is taken as a straight-line electronic device for example, for example, the electronic device 10 is a straight-line mobile phone. The electronic device 10 can include a display screen 100 and a housing 200. One side surface of the display screen 100 is used to display image information. The side surface of the display screen 100 is usually defined as the front surface thereof, and the other side surface opposite to the front surface thereof is the back surface thereof. The housing 200 is arranged around the display screen 100 and the back surface thereof, and is used to support and fix the display screen 100 and provide protection. The front surface of the display screen 100 is exposed outside the housing 200, so that a user can watch the content displayed by the display screen 100 or perform input operation on the electronic device 10.

[0058] FIG. 2 is an exploded structural diagram of the electronic device shown in FIG. 1. Referring to FIG. 2, when the electronic device 10 is a straight-line electronic device, the housing 200 of the electronic device 10 can include a middle frame 201 and a back cover 202. The middle frame 201 is connected between the display screen 100 and the back cover 202. The display screen 100 is supported on one side surface of the middle frame 201, and the back cover 202 is connected to the other side surface of the middle frame 201.

[0059] The display screen 100 is usually integrally attached to the middle frame 201 to ensure the strength and stability of the display screen 100 and meet the use requirements of the display screen 100. The back cover 202 is usually connected to the middle frame 201 in a lapping manner. The middle frame 201 and the back cover 202 jointly form a receiving cavity. The receiving cavity is used to install a circuit board 300, a battery 400, a camera 500, a loudspeaker (not shown in the figure), and the like.

[0060] FIG. 3 is a structural schematic diagram of another electronic device according to an embodiment of the present application. FIG. 4 is a structural schematic diagram of the electronic device in FIG. 3 in a folded state. FIG. 5 is a structural schematic diagram of the electronic device in FIG. 3 in an unfolded state.

[0061] Referring to FIGS. 3-5, the electronic device 10 is taken as an example of a foldable electronic device, for example, a foldable mobile phone. The electronic device 10 can include at least two parts that can rotate relative to each other. In different use scenarios, the electronic device 10 can have different use states. The present embodiment takes the foldable electronic device as an example of the electronic device 10 that can be folded once. The electronic device 10 includes two parts that can rotate relative to each other. By rotating the two parts relative to each other, the use state of the electronic device 10 can be changed.

[0062] The two parts of the electronic device 10 can rotate relative to each other in the direction of the arrow shown in FIG. 3. When the two parts are rotated to be stacked on each other, the electronic device 10 is in the folded state shown in FIG. 4. At this time, the volume of the electronic device 10 is small, and the electronic device 10 is easy to carry. The two parts of the electronic device 10 can also rotate relative to each other in the direction opposite to the direction of the arrow in FIG. 3. When the two parts are rotated to be coplanar, the electronic device 10 is in the unfolded state shown in FIG. 5, and the unfolding angle a of the electronic device 10 is, for example, 180°. At this time, the electronic device 10 can realize large-screen display.

[0063] It should be noted that the angles illustrated in the present embodiment are allowed to have a small deviation. For example, the unfolding angle a of the electronic device 10 is 180°, which means that the unfolding angle a can be 180°, or approximately 180°, such as 170°, 175°, 185°, or 190°, etc. The angles illustrated in the following can be understood in the same way.

[0064] In addition, in addition to the electronic device 10 that can be folded once, the electronic device 10 can also be an electronic device 10 that can be folded more than twice. At this time, the electronic device 10 can include multiple parts that are connected by rotation in sequence. Adjacent two parts can be folded to a folded state by being relatively close to each other, and adjacent two parts can be unfolded to an unfolded state by being relatively far away from each other.

[0065] FIG. 6 is an exploded structural diagram of the electronic device in FIG. 3. Referring to FIG. 6, for the foldable electronic device, the electronic device 10 can also include a display screen 100 and a housing 200. The front of the display screen 100 is used to display image information, and the housing 200 is arranged around the side and back of the display screen 100 to support and fix the display screen 100 and provide protection, which will not be described here.

[0066] The display screen 100 of the electronic device 10 can include a folding screen 110, which can include a first non-bending part 111, a bendable part 112, and a second non-bending part 113 arranged in sequence along a first direction. Alternatively, in the first direction, the bendable part 112 is located between the first non-bending part 111 and the second non-bending part 113. Wherein, the folding mode of the electronic device 10 can be the horizontal folding shown in FIGS. 3-5, at this time, the first direction can be the X direction shown in FIG. 6. Of course, the folding mode of the electronic device 10 can also be vertical folding, which is not limited in the present embodiment.

[0067] For example, the folding screen 110 can be made of a flexible material to make the bendable part 112 bendable. The folding screen 110 can be an organic light-emitting diode (OLED) display screen 100.

[0068] The shell 200 is used to support and fix the folding screen 110, and drive the folding screen 110 to switch between the folded state and the unfolded state. Referring to FIG. 6, the shell 200 includes a first shell 210, a second shell 220, and a hinge mechanism 230 connected between the first shell 210 and the second shell 220. The first shell 210 and the second shell 220 are rotatably connected through the hinge mechanism 230, so as to realize the relative rotation between the first shell 210 and the second shell 220.

[0069] The first shell 210 supports and fixes the first non-bending part 111 of the folding screen 110, the second shell 220 supports and fixes the second non-bending part 113 of the folding screen 110, and the hinge mechanism 230 supports the bendable part 112 of the folding screen 110. In other words, the first non-bending part 111 of the folding screen 110 is fixedly connected to the first shell 210, the second non-bending part 113 of the folding screen 110 is fixedly connected to the second shell 220, and the bendable part 112 of the folding screen 110 is arranged corresponding to the hinge mechanism 230.

[0070] During use of the electronic device 10, the first non-bending part 111 and the second non-bending part 113 of the folding screen 110 always remain in a planar state, while the bendable part 112 of the folding screen 110 can bend. When the hinge mechanism 230 drives the first shell 210 and the second shell 220 to rotate relative to each other, the first non-bending part 111 and the second non-bending part 113 of the folding screen 110 change their orientation accordingly, and the bendable part 112 of the folding screen 110 bends or flattens as the orientation of the first non-bending part 111 and the second non-bending part 113 changes.

[0071] The first housing 210 and the second housing 220 can rotate towards each other to be relatively stacked. At this time, the housing 200 is in a folded state, and the folding screen 110 is in a folded state along with the folding of the housing 200 (as shown in FIG. 4). The first housing 210 and the second housing 220 can also rotate away from each other to be coplanar. At this time, the housing 200 is in an unfolded state, and the folding screen 110 is in an unfolded state along with the unfolding of the housing 200 (as shown in FIG. 5).

[0072] It should be noted that the present embodiment takes the electronic device 10 as an example of an inner folding electronic device. When the electronic device 10 is in a folded state, the first non-bending part 111 and the second non-bending part 113 of the folding screen 110 are relatively attached, the housing 200 is arranged outside the folding screen 110, and the folding screen 110 is located between the first housing 210 and the second housing 220. In this way, when the inner folding electronic device is in a folded state, the housing 200 can provide protection for the folding screen 110 to prevent the folding screen 110 from being scratched by a hard object.

[0073] If the inner folding electronic device needs to realize a display function in a folded state, a straight screen 120 can be additionally arranged on the back of the housing 200. The electronic device 10 realizes a display function in a folded state by relying on the straight screen 120 (see FIG. 3 or FIG. 4). In other words, the display screen 100 of the inner folding electronic device can include the folding screen 110 and the straight screen 120. The folding screen 110 can be attached to the front of the housing 200, and the folding screen 110 can be switched between an unfolded state and a folded state along with the movement of the housing 200. When the electronic device 10 is in a folded state, the folding screen 110 is not visible to the outside. The straight screen 120 can be attached to the back of the housing 200, and the straight screen 120 displays when the electronic device 10 is in a folded state.

[0074] In other examples, the electronic device 10 can also be an outer folding electronic device. When the electronic device 10 is in a folded state, the first non-bending part 111 and the second non-bending part 113 of the folding screen 110 are opposite to each other, and the housing 200 is located between the first non-bending part 111 and the second non-bending part 113. In other words, when the outer folding electronic device is in a folded state, the folding screen 110 is arranged outside the first housing 210 and the second housing 220, the folding screen 110 is visible to the user, and the display function can be realized by using the folding screen 110. Therefore, it is not necessary to additionally increase the straight screen 120 on the back of the housing 200 in order to realize the display function of the electronic device 10 in a folded state.

[0075] In addition, in some embodiments, the electronic device 10, especially the inner folding electronic device, can be suspended at an angle β (see FIG. 3) between the unfolded state and the folded state. For example, the suspension angle β of the electronic device 10 can be 120°, 130°, 140°, or 150°, etc. Among them, the shell 200 can be suspended at a half-unfolded state between the folded state and the unfolded state by the damping force provided by the shell 200, and the folding screen 110 stays at the half-unfolded state with the shell 200.

[0076] At this time, the bendable part 112 of the folding screen 110 is also in a bent state, and the bending degree of the bendable part 112 is less than that when it is in the folded state. The folding screen 110 is relatively inclined between the first non-bendable part 111 and the second non-bendable part 113, and the included angle between the first non-bendable part 111 and the second non-bendable part 113 is, for example, 120°, 130°, 140°, or 150°, etc.

[0077] Continuing to refer to FIG. 6, in the shell 200 of the folding electronic device, the first shell 210 and the second shell 220 can each include a middle frame 201, and the first non-bendable part 111 and the second non-bendable part 113 of the folding screen 110 can be supported on the front surface of the corresponding middle frame 201. Among them, for the outer folding electronic device or the inner folding electronic device without an additional straight screen 120, the first shell 210 and the second shell 220 of the electronic device 10 can each further include a back cover 202 connected to the side surface of the middle frame 201 away from the folding screen 110. For the inner folding electronic device with an additional straight screen 120, one of the first shell 210 and the second shell 220 can not include the back cover 202, but instead install the straight screen 120 on the back of the middle frame 201.

[0078] Among the first shell 210 and the second shell 220, the middle frame 201 and the back cover 202 (or the straight screen 120) together enclose a receiving cavity, and the receiving cavity is used to install the circuit board 300, the battery 400, the camera 500, the speaker (not shown in the figure), and the like.

[0079] As described in the background, in the related art, the shell 200 of some electronic devices 10 uses glass as the base 2001, and uses OCA adhesive layer to attach the acetate film 2002 to the inner surface of the glass, so as to give the shell 200 a unique texture and luster through the acetate film 2002. However, due to the high cost of glass and OCA adhesive layer, the manufacturing cost of the existing shell 200 is usually high, which is not conducive to the cost control of the entire electronic device 10. Moreover, before the shell 200 is assembled into the entire electronic device 10, and during the service of the shell 200 in the entire electronic device 10, there is a problem that the acetate film 2002 is easy to absorb water, which affects the appearance effect and reliability of the shell 200.

[0080] Therefore, the shell 200 of the electronic device 10 is improved in the embodiments of the present application. The shell 200 takes a base as a main support structure. An outer surface of the base faces the outside world, and an inner surface of the base faces the inside of the electronic device 10. The inner surface of the base is sequentially provided with an acetate film and a protective layer. By adding the acetate film in the shell 200, the acetate film can give the shell 200 a unique texture and luster. By taking the base and the protective layer as a polycarbonate layer, a polymethyl methacrylate layer, or a composite board composed of polycarbonate and polymethyl methacrylate, the base and the protective layer are both made of plastic, which can reduce the manufacturing cost of the shell 200 and further save the production cost of the entire electronic device 10. Moreover, by sandwiching the acetate film between the base and the protective layer, the acetate film can be protected from both sides, and the gap on both sides of the acetate film can be reduced, and the compactness of the acetate film on both sides can be enhanced. Furthermore, the waterproof performance of the shell 200 can be improved, the appearance effect of the shell 200 can be prevented from being affected by water absorption of the acetate film, and the reliability of the shell 200 and the entire electronic device 10 can be improved.

[0081] The shell 200 of the electronic device 10 in the embodiments of the present application is described in detail below.

[0082] For example, the electronic device 10 is a straight-line electronic device, and the shell 200 can be specifically improved by the back cover 202 in the shell 200. For example, the electronic device 10 is a folding electronic device, and the shell 200 can be specifically improved by the back cover 202 in the first shell 210 and the second shell 220. When the electronic device 10 is a tablet computer, a notebook computer, a wearable device, or other electronic products, the shell 200 as an appearance part in the electronic device 10 can be improved.

[0083] FIG. 7 is a structural schematic diagram of a first shell according to an embodiment of the present application. FIG. 8 is a structural schematic diagram of a second shell according to an embodiment of the present application. FIG. 9 is a structural schematic diagram of a third shell according to an embodiment of the present application. FIG. 10 is a structural schematic diagram of a fourth shell according to an embodiment of the present application.

[0084] Referring to any one of FIGS. 7 to 10, in the present embodiment, the shell 200 can include a base 2001, an acetate film 2002, and a protective layer 2003 sequentially stacked. The two side surfaces of the base 2001 in the thickness direction are an outer surface and an inner surface, respectively. The outer surface of the base 2001 faces the outside world, and the inner surface of the base 2001 faces the inside of the electronic device 10. For example, the outer surface of the base 2001 can face away from the middle frame 201, and the inner surface of the base 2001 can face toward the middle frame 201. The acetate film 2002 and the protective layer 2003 are sequentially arranged on the side where the inner surface of the base 2001 is located.

[0085] The base body 2001 can be a support body in the shell 200, which serves as the main force bearing structure of the shell 200, for the shell 200 to have sufficient structural strength to ensure the stability and reliability of the shell 200, and to ensure the service life of the shell 200. The base body 2001 can have a certain thickness, and the base body 2001 has good hardness and mechanical strength to provide the required structural strength of the shell 200.

[0086] The base body 2001 can be a transparent structure, and the light transmittance of the base body 2001 can reach more than 90%, and the appearance effect of the shell 200 is mainly presented by the acetate film 2002 located inside the base body 2001. The acetate film 2002 is a film made of acetate fiber, and the acetate fiber is a thermoplastic resin obtained by esterification under the action of a catalyst with acetic acid as a solvent and acetic anhydride as an acetylating agent. The acetate film 2002 made of acetate fiber has the advantages of good layering, good gloss, not easy to deform and discolor, and durable. By setting the acetate film 2002 on the inside of the base body 2001, the shell 200 can be given special texture and gloss, and the appearance effect of the shell 200 can be improved.

[0087] For example, the acetate film 2002 can be a film piece formed by a series of processes such as proportioning, stirring, kneading, mixing, plate forming, cutting, etc. on the powder-like acetate fiber raw material. Different colored toner (colored powder substance) can be mixed with the acetate fiber raw material to form at least two different colored acetate fiber raw materials. Then, the acetate fiber raw materials of different colors are made into large particle pieces or small size sheet pieces, and then the large particle pieces or small size sheet pieces are mixed or placed and shaped, and then plate formed into acetate fiber plates with larger size and greater thickness. After that, the acetate fiber plates are stretched and cut to form acetate film 2002 with appropriate size and thickness.

[0088] Natural mineral powder can also be added to the raw material for making the acetate film 2002, and the natural mineral powder can be mixed into the acetate fiber raw material to form a powder-like raw material. The addition of natural mineral powder can make the acetate film 2002 present a special natural texture and gloss to improve the appearance effect of the shell 200. For example, natural bead material can be mixed into the acetate fiber raw material to make the shell 200 present a gloss very close to that of pearls.

[0089] It can be understood that by adding natural mineral powder to the acetate fiber raw material, the acetate film 2002 presents a texture and gloss very close to nature. At the same time, by taking advantage of the good plasticity and strong deformation ability of the acetate fiber raw material, the acetate film 2002 is easy to stretch and deform, and can form an infinitely variable and unique texture effect.

[0090] In this way, by stretching the acetic acid fiber plate after the pressing plate is formed, for example, by stretching the acetic acid fiber plate in the transverse direction and in the longitudinal direction, not only can the thickness of the acetic acid fiber plate be thinned to form the acetic acid fiber film 2002 with a relatively thin thickness, but also the direction, profile and gloss of the texture on the acetic acid fiber plate will change, and each acetic acid fiber film 2002 formed finally will have a unique texture and gloss. Thus, each electronic device 10 provided with the shell 200 can have a unique appearance effect.

[0091] Taking the acetic acid fiber film 2002 with two different colored powder raw materials as an example, the two different colored powder raw materials can have similar colors, and the texture formed by the acetic acid fiber film 2002 can have different depths or light and dark interlaced. Thus, the shell 200 of the electronic device 10 can have a texture effect with similar color systems and light and dark interlaced. Alternatively, the two different colored acetic acid fiber raw materials can have a large difference in color, and the texture formed by the acetic acid fiber film 2002 can have two colors interlaced and unique changes. Thus, the shell 200 of the electronic device 10 can have a texture effect with two colors interlaced and unique visual effects.

[0092] Since the acetic acid fiber film 2002 uses acetic acid fiber as the base material 2001, compared with a plate material with a larger density and higher hardness, the acetic acid fiber film 2002 is easy to absorb water. If the acetic acid fiber film 2002 absorbs too much water, it will affect the texture and gloss of the acetic acid fiber film 2002, and further affect the appearance effect of the shell 200. If the acetic acid fiber film 2002 absorbs too much water, it can also affect the connection strength between the acetic acid fiber film 2002 and the structure layers on both sides thereof, and further affect the stability and reliability of the shell 200, and affect the service life of the shell 200.

[0093] To this end, the embodiment further provides a protective layer 2003 on the side of the acetic acid fiber film 2002 away from the base 2001. The protective layer 2003 can also have a certain thickness, and the protective layer 2003 has good hardness and mechanical strength. The base 2001 and the protective layer 2003 sandwich the acetic acid fiber film 2002 to form a sandwich structure. The base 2001 and the protective layer 2003 are tightly attached to the two sides of the acetic acid fiber film 2002, respectively. For the base 2001 and the protective layer 2003 with sufficient hardness and mechanical strength, the density of the base 2001 and the protective layer 2003 is relatively large, which can reduce the gap on both sides of the acetic acid fiber film 2002 and ensure the compactness on both sides of the acetic acid fiber film 2002, thereby protecting the two sides of the acetic acid fiber film 2002.

[0094] Therefore, by sandwiching the acetate film 2002 between the base 2001 and the protective layer 2003 in such a sandwich structure, the waterproof performance of the shell 200 can be improved. The external water vapor is prevented from entering the acetate film 2002, avoiding the acetate film 2002 from absorbing water to affect the texture and gloss, and ensuring the appearance effect of the shell 200. Moreover, the connection strength between the acetate film 2002 and the base 2001 and the protective layer 2003 on both sides thereof is ensured, the stability and reliability of the shell 200 are improved, and the service life of the shell 200 is prolonged.

[0095] For example, during the use of the electronic device 10, due to the close adhesion of the acetate film 2002 to the base 2001 and the protective layer 2003 on both sides thereof, the acetate film 2002 has few gaps on both sides thereof and has high density on both sides thereof. The external water vapor can be prevented from entering the acetate film 2002 from the outer surface of the shell 200 (the side on which the base 2001 is located). Moreover, due to the few gaps on both sides of the acetate film 2002, the overall density of the sandwich structure formed by the acetate film 2002, the base 2001, and the protective layer 2003 on both sides thereof is large, and the external water vapor can also be prevented from entering the acetate film 2002 from the circumferential side of the shell 200, preventing the side wall of the shell 200 from being waterlogged and avoiding the waterlogging problem caused by the assembly mode of the shell 200 and the middle frame 201.

[0096] Before the shell 200 is assembled to the electronic device 10, by sandwiching the acetate film 2002 between the base 2001 and the protective layer 2003 in such a sandwich structure, the external water vapor can also be prevented from entering the acetate film 2002 from the two side surfaces of the shell 200. The texture and gloss effect of the acetate film 2002 are ensured, and the appearance strength of the shell 200 is ensured. Moreover, the protective layer 2003 can enhance the structural strength of the shell 200, the connection strength between the acetate film 2002 and the base 2001 and the protective layer 2003 on both sides thereof is high, the stability and reliability of the shell 200 can be improved, and the shell 200 can be prevented from being damaged.

[0097] The base 2001 can be made of polycarbonate (PC) and is a polycarbonate layer a. The polycarbonate has high transparency, meeting the light transmittance requirement of the base 2001. Meanwhile, the polycarbonate also has other advantages such as high impact strength, good toughness, good fatigue resistance, good dimensional stability, and wide use temperature range, which can improve the reliability and service life of the shell 200.

[0098] Alternatively, the base 2001 can also be made of poly(methyl methacrylate) (PMMA), and the base 2001 is a PMMA layer b. PMMA has high transparency, and can meet the light transmittance requirement of the base 2001. In addition, PMMA has other advantages such as high strength, high hardness, good wear resistance, and good dimensional stability, and can improve the reliability and service life of the shell 200.

[0099] Alternatively, the base 2001 can be made of a composite of polycarbonate and PMMA, and the base 2001 is a composite board made of polycarbonate and PMMA. In this way, on the basis of ensuring high light transmittance of the base 2001, the composite board as the base 2001 has both the impact toughness of polycarbonate and the high hardness and wear resistance of PMMA, and can further improve the reliability and service life of the shell 200.

[0100] When the base 2001 is a composite board made of polycarbonate and PMMA, the polycarbonate layer a and the PMMA layer b can be co-extruded and extruded into a composite board to serve as the base 2001. In this way, the base 2001 has good integrity and high structural strength between layers without using adhesives, which is conducive to improving the stability and reliability of the shell 200. Moreover, since no adhesives are used, there is no problem of solvent residue, and the base 2001 has no odor.

[0101] Taking an example in which the base 2001 includes a polycarbonate layer a and a PMMA layer b, the PMMA layer b can be arranged on the side where the outer surface of the base 2001 is located, so as to ensure the hardness and wear resistance of the shell 200. The polycarbonate layer a is arranged on the side where the inner surface of the base 2001 is located, so as to ensure the impact toughness of the base 2001 and improve the overall impact toughness of the shell 200.

[0102] Similarly to the base 2001, the protective layer 2003 can be made of polycarbonate, and the protective layer 2003 is a polycarbonate layer a, which has high impact strength and good toughness. Alternatively, the protective layer 2003 can be made of PMMA, and the protective layer 2003 is a PMMA layer b, which has high hardness and good wear resistance. Alternatively, the protective layer 2003 can be made of a composite of polycarbonate and PMMA, and the protective layer 2003 is a composite board made of polycarbonate and PMMA, which has both the impact toughness of polycarbonate and the high hardness and wear resistance of PMMA. Details are not described herein.

[0103] For example, when the protective layer 2003 is a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b, the polycarbonate layer a and the polymethyl methacrylate layer b can be co-extruded and extruded into the composite board to serve as the protective layer 2003. In this way, the protective layer 2003 does not need to use an adhesive between layers, has good integrity and high structural strength, and does not have a solvent residue problem, which will not be described here.

[0104] In addition, since the protective layer 2003 is located on the side of the acetate film 2002 away from the base 2001, the protective layer 2003 is away from the outer surface of the shell 200. Thus, there is no special requirement for the surface properties of the protective layer 2003. When the protective layer 2003 is a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b, the stacking position of the polycarbonate layer a and the polymethyl methacrylate layer b is not limited.

[0105] By using a polycarbonate layer a, a polymethyl methacrylate layer b, or a composite board composed of polycarbonate and polymethyl methacrylate as the base 2001 and the protective layer 2003, the base 2001 and the protective layer 2003 are both made of plastic. On the basis of ensuring the structural strength of the base 2001 and the protective layer 2003, the cost of the base 2001 and the protective layer 2003 is low. Thus, the manufacturing cost of the shell 200 can be reduced, and the production cost of the entire electronic device 10 can be saved.

[0106] The thickness of the base 2001 can be in the range of 0.30mm-0.45mm. In this way, the base 2001 has sufficient thickness to meet the structural strength requirements of the base 2001. Further, it ensures that the shell 200 has sufficient structural strength, stability and reliability, and ensures the service life of the shell 200. At the same time, the thickness of the base 2001 is not too large, which can reduce the overall thickness of the shell 200, which is beneficial to the thinning of the electronic device 10.

[0107] In addition, when the base 2001 is a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b, by controlling the thickness of the base 2001 to be between 0.30mm-0.45mm, the thickness of the single polycarbonate layer a and the single polymethyl methacrylate layer b is not excessively limited, and the stability and reliability of the polycarbonate layer a and the polymethyl methacrylate layer b can be ensured.

[0108] Exemplarily, the thickness of the base 2001 can be 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.40 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, etc.

[0109] The thickness of the protective layer 2003 can range from 0.05 mm to 0.15 mm, or in other words, the thickness of the protective layer 2003 can be between 0.05 mm and 0.15 mm. In this way, as a structural layer arranged on the side of the cellulose acetate film 2002 away from the base 2001, the thickness of the protective layer 2003 is not too small, and the protective layer 2003 has sufficient structural strength and stability to support the cellulose acetate film 2002 and prevent external moisture from entering the cellulose acetate film 2002. At the same time, the thickness of the protective layer 2003 is smaller than the thickness of the base 2001, and on the basis of improving the structural strength of the shell 200 by the protective layer 2003, the thickness of the protective layer 2003 is smaller, which can thin the overall thickness of the shell 200, and is conducive to the slimming of the electronic device 10.

[0110] In addition, when the protective layer 2003 is a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b, by controlling the thickness of the protective layer 2003 to be between 0.05 mm and 0.15 mm, the thickness of the single polycarbonate layer a and the single polymethyl methacrylate layer b is not excessively limited, and the stability and reliability of the polycarbonate layer a and the polymethyl methacrylate layer b can be ensured.

[0111] Exemplarily, the thickness of the protective layer 2003 can be 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, etc.

[0112] The thickness of the cellulose acetate film 2002 can range from 0.05 mm to 0.15 mm, or in other words, the thickness of the cellulose acetate film 2002 can be between 0.05 mm and 0.15 mm. In this way, the cellulose acetate film 2002 has a certain thickness, which can ensure the structural strength and stability of the cellulose acetate film 2002, ensure that the cellulose acetate film 2002 has good texture effect and gloss, and avoid that the structural layer arranged on the side of the cellulose acetate film 2002 away from the base 2001 affects the appearance effect of the shell 200. Moreover, the thickness of the cellulose acetate film 2002 is small, and for the cellulose acetate film 2002 which has strong deformation ability and small structural strength, the cellulose acetate film 2002 can be prevented from being too thick to affect the structural strength of the shell 200, and the stability and reliability of the shell 200 can be ensured.

[0113] For example, the cellulose acetate film 2002 can have a thickness of 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, etc.

[0114] Referring to FIG. 7, the base 2001 is shown as a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b. The polymethyl methacrylate layer b is on the side where the outer surface of the base 2001 is located, and the polycarbonate layer a is on the side where the inner surface of the base 2001 is located. In addition, the protective layer 2003 is shown as a polycarbonate layer a.

[0115] In this way, the base 2001 has both the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. At the same time, the protective layer 2003 is a single-layer polycarbonate layer a, which is convenient for processing the relatively thin protective layer 2003 and has the impact toughness of polycarbonate. Thus, the reliability and service life of the shell 200 can be improved.

[0116] Referring to FIG. 8, the base 2001 is shown as a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b. The polymethyl methacrylate layer b is on the side where the outer surface of the base 2001 is located, and the polycarbonate layer a is on the side where the inner surface of the base 2001 is located. In addition, the protective layer 2003 is shown as a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b.

[0117] In this way, the base 2001 has both the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. Similarly, the protective layer 2003 has both the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. Thus, the reliability and service life of the shell 200 can be improved.

[0118] Referring to FIG. 9, the base 2001 is shown as a polycarbonate layer a, and the protective layer 2003 is also shown as a polycarbonate layer a. In this way, the base 2001 and the protective layer 2003 both have the impact toughness of polycarbonate. In addition, the base 2001 and the protective layer 2003 both adopt a single-layer polycarbonate layer a, which is convenient for processing the base 2001 and the protective layer 2003 and is conducive to improving the manufacturing efficiency of the shell 200.

[0119] Referring to FIG. 10, the base 2001 is exemplified as a polycarbonate layer a. Also, the protective layer 2003 is exemplified as a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b. In the exemplified protective layer 2003, the polycarbonate layer a is located on the side of the protective layer 2003 facing the cellulose acetate film 2002, and the polymethyl methacrylate layer b is located on the side of the protective layer 2003 facing away from the cellulose acetate film 2002.

[0120] In this way, the base 2001 has the impact toughness of polycarbonate. Also, the base 2001 adopts the single-layer polycarbonate layer a, which facilitates the processing of the base 2001. The protective layer 2003 has both the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. Thus, the reliability and service life of the shell 200 can be improved.

[0121] Referring to any one of FIGS. 7 to 10, since the base 2001 and the protective layer 2003 are both thin plate members with high hardness and high rigidity, and the cellulose acetate film 2002 is a thin film with good elasticity and strong deformation capacity, in order to connect the base 2001, the cellulose acetate film 2002 and the protective layer 2003 together, the base 2001 and the protective layer 2003 can be respectively bonded to the two sides of the cellulose acetate film 2002 by an adhesive, so as to realize the close connection of the three and ensure the integrity and stability of the shell 200.

[0122] Among them, the first adhesive layer 2004 can be arranged between the base 2001 and the cellulose acetate film 2002, and the base 2001 and the cellulose acetate film 2002 are bonded together through the first adhesive layer 2004. The second adhesive layer 2005 is arranged between the protective layer 2003 and the cellulose acetate film 2002, and the protective layer 2003 and the cellulose acetate film 2002 are bonded together through the second adhesive layer 2005. The first adhesive layer 2004 and the second adhesive layer 2005 are used to firmly bond the base 2001 and the protective layer 2003 to the two sides of the cellulose acetate film 2002, so as to ensure the connection strength between the three.

[0123] The cellulose acetate film 2002 is clamped by the first adhesive layer 2004 and the second adhesive layer 2005, which reduces the gap on both sides of the cellulose acetate film 2002 and ensures the compactness of the cellulose acetate film 2002 on both sides. Also, the base 2001 and the protective layer 2003 on both sides of the cellulose acetate film 2002 are both high-density structural members, which can provide good protection for the cellulose acetate film 2002. In this way, the external moisture can be prevented from entering the cellulose acetate film 2002 from both sides of the shell 200 and the side wall of the shell 200, so as to avoid affecting the texture effect and gloss of the cellulose acetate film 2002 and ensure the appearance effect of the shell 200.

[0124] For example, at least one of the first adhesive layer 2004 and the second adhesive layer 2005 is a UV adhesive layer. UV (Ultraviolet Rays) adhesive, also known as ultraviolet-curing adhesive, photosensitive adhesive, or shadowless adhesive, refers to a type of adhesive that requires ultraviolet light irradiation to cure. UV adhesives have a simple curing method, fast curing speed, and low cost. Using UV adhesive to bond at least one of the substrate 2001 and the protective layer 2003 to the cellulose acetate membrane 2002 can improve the manufacturing efficiency of the housing 200 and reduce its manufacturing cost. Therefore, it is beneficial to reduce the overall production cost of the electronic device 10.

[0125] For example, the first adhesive layer 2004 between the substrate 2001 and the cellulose acetate membrane 2002 is a UV adhesive layer, and the second adhesive layer 2005 between the protective layer 2003 and the cellulose acetate membrane 2002 is also a UV adhesive layer. Alternatively, the first adhesive layer 2004 between the substrate 2001 and the cellulose acetate membrane 2002 can be a UV adhesive layer, and the second adhesive layer 2005 between the protective layer 2003 and the cellulose acetate membrane 2002 can be another type of adhesive layer. Or, the first adhesive layer 2004 between the substrate 2001 and the cellulose acetate membrane 2002 can be another type of adhesive layer, and the second adhesive layer 2005 between the protective layer 2003 and the cellulose acetate membrane 2002 can be a UV adhesive layer. Of course, the first adhesive layer 2004 between the substrate 2001 and the cellulose acetate membrane 2002, and the second adhesive layer 2005 between the protective layer 2003 and the cellulose acetate membrane 2002 can both be other types of adhesive layers.

[0126] When at least one of the first adhesive layer 2004 and the second adhesive layer 2005 is selected from other types of adhesive layers, the adhesive layer can be an OCA adhesive layer. OCA (Optically Clear Adhesive) has high light transmittance, high adhesion, and good weather resistance, water resistance, high temperature resistance, and UV resistance. Using OCA adhesive to connect at least one of the substrate 2001 and the protective layer 2003 to the cellulose acetate membrane 2002 can ensure the bonding strength between the three, and ensure the integrity and structural strength of the shell 200.

[0127] Referring again to any of Figures 7 to 10, the housing 200 further includes a cover layer 2006, which is disposed on the side of the protective layer 2003 facing away from the cellulose acetate membrane 2002. The cover layer 2006 may be located on the surface of the housing 200 facing inwards towards the electronic device 10, or in other words, the cover layer 2006 serves as the inner surface layer of the housing 200. The cover layer 2006 typically comprises multiple layers of ink. By printing or spraying multiple layers of ink onto the inner surface of the housing 200, the housing 200 can be protected from wear or scratches to the structural layers beneath the cover layer 2006.

[0128] The cover bottom layer 2006 corresponds to the primer layer of the shell 200. For the multi-layer ink layer included in the cover bottom layer 2006, the multi-layer ink layer can include an ink layer located on the surface layer of the shell 200 and the multi-layer ink layer printed thereon. The ink layer located on the surface layer can be a white ink layer, a gray ink layer or a black ink layer, and the other ink layers can all be white ink layers. The primer layer provides a color-uniform and non-transparent primer layer for the shell 200, which can ensure the appearance effect of the shell 200. The color ink layer is not used as the cover bottom layer 2006 to prevent affecting the color and texture of other structural layers of the shell 200 and preventing affecting the appearance effect of the shell 200.

[0129] For example, the cover bottom layer 2006 can include a flame-retardant ink layer. The flame-retardant ink can be an ink in which a flame retardant is added to improve the flame-retardant performance of the ink layer. In this way, the shell 200 can be prevented from accidentally catching fire, and the safety and reliability of the shell 200 can be improved.

[0130] Continuing to refer to any one of FIGS. 7 to 10, the shell 200 can further include a reinforcing layer 2007 disposed on the outer surface of the base 2001. The reinforcing layer 2007 can be located on the side surface of the shell 200 facing outward of the electronic device 10, or in other words, the reinforcing layer 2007 serves as the outer surface layer of the shell 200. The reinforcing layer 2007 is mainly used for hardening treatment of the outer surface of the shell 200 to enhance the hardness and wear resistance of the shell 200. Thus, the stability and reliability of the shell 200 are improved, and the service life of the shell 200 is prolonged. For example, a UV glue layer can be formed on the outer surface of the base 2001 by using a curtain coating or UV transfer printing technology, and the UV glue layer serves as the reinforcing layer 2007 after curing.

[0131] In addition, a silk screen texture, for example, a logo pattern of the electronic device 10, can be formed on the side surface of the reinforcing layer 2007 facing the base 2001 or on any side surface of the base 2001 (the outer surface of the base 2001 or the inner surface of the base 2001). Alternatively, an etching texture, for example, a logo pattern of the electronic device 10, can be formed on any side surface of the base 2001 by using a laser etching process.

[0132] FIG. 11 is a structural schematic diagram of a fifth shell provided by an embodiment of the present application. Referring to FIG. 11, the base 2001 is a composite plate, and the protective layer 2003 is a polycarbonate layer a. In some embodiments, other film layers can be further arranged between the cover bottom layer 2006 and the protective layer 2003 to enhance the structural strength and hardness of the shell 200, improve the reliability of the shell 200, and prolong the service life of the shell 200.

[0133] The coating layer 2008 can be arranged between the cover bottom layer 2006 and the protective layer 2003. The coating layer 2008 can improve the performance of the shell 200. For example, the coating layer 2008 can improve the hardness of the shell 200, improve the anti-falling ability of the shell 200, improve the oxidation resistance and durability of the shell 200, and the like.

[0134] For example, the coating layer 2008 arranged between the cover bottom layer 2006 and the protective layer 2003 can include a silicon oxide layer 20081, for example, attached to the cover bottom layer 2006. Silicon oxide (SiO2) is a main material for manufacturing glass and ceramic, and has good stability, high strength, high hardness, good wear resistance and anti-aging performance. By adding the silicon oxide layer 20081 to the shell 200, the strength and hardness of the shell 200 can be improved, the wear resistance and anti-aging performance of the shell 200 can be enhanced, and the shell 200 can be prevented from being filled with water, which can also help to improve the flame retardant performance of the shell 200. Thus, the stability and reliability of the shell 200 can be improved, and the service life of the shell 200 can be prolonged.

[0135] Based on the silicon oxide layer 20081 arranged between the cover bottom layer 2006 and the protective layer 2003, a zirconium oxide layer 20082 can also be added between the cover bottom layer 2006 and the protective layer 2003. The zirconium oxide layer 20082 can be arranged between the silicon oxide layer 20081 and the protective layer 2003. Zirconium oxide (ZrO2) belongs to ceramic material, and has electrical, magnetic, thermal, optical and other properties. Zirconium oxide has high hardness, high dielectric constant, good stability, corrosion resistance, oxidation resistance and other advantages. By adding the zirconium oxide layer 20082 to the shell 200, the shell 200 can be more solid and wear-resistant, not shield signals, and have good heat dissipation, which can improve the reliability and service life of the shell 200.

[0136] An ink layer 2009 can be arranged between the silicon oxide layer 20081 and the zirconium oxide layer 20082 to isolate the silicon oxide layer 20081 and the zirconium oxide layer 20082. The silicon oxide layer 20081 and the zirconium oxide layer 20082 can be prevented from affecting and interfering with each other during the formation of the zirconium oxide layer 20082 and the silicon oxide layer 20081, and the performance of the silicon oxide layer 20081 and the zirconium oxide layer 20082 can be ensured.

[0137] Continuing to refer to FIG. 11, the shell 200 can further be provided with a UV texture layer 2010, which can be provided between the protective layer 2003 and the film-coated layer 2008. For example, the UV texture layer 2010 can be formed on the protective layer 2003. The UV texture layer 2010 can be formed by processing a mold to form a desired texture, dropping UV glue on the mold, and then covering the protective layer 2003 on the mold, and after processes such as rolling and photocuring, peeling the protective layer 2003 from the mold. In this way, the texture on the mold can be completely copied to the protective layer 2003 through the UV glue, thereby realizing UV transfer printing and forming the UV texture layer 2010.

[0138] By providing the UV texture layer 2010 between the protective layer 2003 and the film-coated layer 2008, the UV texture layer 2010 can be formed on the protective layer 2003, which can enhance the adhesion between the film-coated layer 2008 and the protective layer 2003, and improve the integrity and reliability of the shell 200. In some cases, the texture effect of the UV texture layer 2010 can be superimposed with the texture effect of the acetate film 2002 through the protective layer 2003, to improve the appearance effect of the shell 200.

[0139] The shell 200 of the electronic device 10 provided in the embodiments of the present application also provides a manufacturing method (hereinafter referred to as the manufacturing method) for manufacturing the shell 200 of the electronic device 10. The manufacturing method will be described in detail below.

[0140] FIG. 12 is a step flowchart of the manufacturing method of the shell provided in the embodiments of the present application. Referring to FIG. 12, the manufacturing method includes the following steps:

[0141] S100, providing a base 2001 and an acetate film 2002, and connecting the inner surface of the base 2001 and the acetate film 2002.

[0142] Referring to any one of FIGS. 7-11, first, the base 2001 and the acetate film 2002 are provided, and the base 2001 and the acetate film 2002 are stacked and precisely aligned. Then, the base 2001 and the acetate film 2002 are connected and integrated.

[0143] Among them, the acetate film 2002 can be manufactured first. The manufacturing process of the acetate film 2002 will be described below.

[0144] As mentioned above, the powder raw material can be provided first. The powder raw material can include only the cellulose acetate raw material. Alternatively, a natural mineral powder can be added to the cellulose acetate raw material, and the two can be mixed to form the powder raw material. Color powders of different colors can be mixed with the powder raw material to form powder raw materials of at least two different colors. Hereinafter, a cellulose acetate film 2002 will be formed from two powder raw materials of different colors, and a specific example will be described in which the two powder raw materials are referred to as an A raw material and a B raw material, respectively.

[0145] After the A raw material and the B raw material are formed, the A raw material and the B raw material are added to solvents, respectively, and kneaded sufficiently (this process can be performed in a kneader). The A raw material and the B raw material are uniformly kneaded to form A blocks and B blocks that are soft in texture and large in volume. The A blocks and the B blocks are left to stand for a certain period of time.

[0146] Then, the A blocks and the B blocks are cut into large thin pieces to form A large pieces and B large pieces. The A large pieces and the B large pieces are further cut into small thin pieces to form A small pieces and B small pieces. Depending on the molding requirements of the cellulose acetate film 2002, the A small pieces and the B small pieces can be further processed into granular or short columnar shapes to form A granules and B granules. For example, the A granules and the B granules can each have a length of about 25 mm.

[0147] After the A granules and the B granules are dried, the next mixing process is performed. Depending on the texture requirements of the cellulose acetate film 2002, the A granules and the B granules can be mixed uniformly, or the A granules and the B granules can be arranged in a specific pattern. For example, the A granules and the B granules can be arranged alternately from the center to the outside, so that the cellulose acetate film 2002 has a radial texture. Then, the arranged A granules and B granules are heated and pressed to form a cellulose acetate plate that is large in planar size and thick in thickness. The cellulose acetate plate is dried, baked, and leveled to form a dry and flat cellulose acetate plate.

[0148] Next, the cellulose acetate plate is stretched. The cellulose acetate plate can be stretched at least once in the horizontal direction and at least once in the vertical direction. In this process, the cellulose acetate plate that is large in size and thick in thickness is stretched to become a cellulose acetate sheet that is larger in size and thinner in thickness. At the same time, as the thickness of the cellulose acetate plate decreases, the texture of the cellulose acetate plate changes, and the final cellulose acetate sheet has the appearance texture of the housing 200. Finally, the cellulose acetate sheet is cut to form cellulose acetate films 2002 that meet the size requirements.

[0149] Taking the white particles as the A particles and the light gray particles as the B particles as an example, the acetate film 2002 formed after the A particles and the B particles are mixed uniformly, hot-pressed, stretched, and cut can have multiple color blocks with white and light gray colors, and each white color block and light gray color block has a unique texture, which can give the shell 200 a unique natural texture and luster.

[0150] As for the bonding connection of the base 2001 and the acetate film 2002, a first adhesive layer 2004 can be formed on the surface of one of the base 2001 and the acetate film 2002, the other of the base 2001 and the acetate film 2002 is placed on the first adhesive layer 2004, and the base 2001 and the acetate film 2002 are accurately aligned. Then, the base 2001 and the acetate film 2002 are pressed together to bond the base 2001 and the acetate film 2002 together with the first adhesive layer 2004, so as to ensure that the base 2001 and the acetate film 2002 are connected firmly and flatly.

[0151] The point gluing process can be used to coat the UV glue or OCA (optical transparent adhesive) on the surface of the base 2001 or the surface of the acetate film 2002 to form the first adhesive layer 2004. When the first adhesive layer 2004 is a UV glue layer, the UV glue is coated on the base 2001 or the acetate film 2002, and then the first adhesive layer 2004 is irradiated by a UV lamp to cure the first adhesive layer 2004 by using the ultraviolet light emitted by the UV lamp. In addition, the propagation direction of the ultraviolet light emitted by the UV lamp can be selected to ensure that the ultraviolet light completely cures the first adhesive layer 2004, so as to ensure that the base 2001 and the acetate film 2002 are connected firmly.

[0152] When the base 2001 is the aforementioned polycarbonate layer a, the base 2001 has a high transmittance to ultraviolet light. At this time, the UV lamp can be arranged on the side where the base 2001 is located, and the ultraviolet light emitted by the UV lamp passes through the base 2001 to reach the first adhesive layer 2004. Alternatively, the UV lamp can also be arranged on the side where the acetate film 2002 is located, and the ultraviolet light emitted by the UV lamp passes through the acetate film 2002 to reach the first adhesive layer 2004. Whether the ultraviolet light passes through the base 2001 to reach the first adhesive layer 2004 or the ultraviolet light passes through the acetate film 2002 to reach the first adhesive layer 2004, the first adhesive layer 2004 has a high absorption rate to ultraviolet light, which can ensure that the first adhesive layer 2004 is completely cured.

[0153] When the substrate 2001 is the aforementioned polymethyl methacrylate layer b or the composite board, the cellulose acetate film 2002 has a higher transmittance to ultraviolet light than the substrate 2001. At this time, the ultraviolet lamp can be arranged on the side where the cellulose acetate film 2002 is located, and the ultraviolet light emitted by the ultraviolet lamp passes through the cellulose acetate film 2002 to reach the first adhesive layer 2004. In this way, the absorption rate of the first adhesive layer 2004 to ultraviolet light is ensured, and the complete curing of the first adhesive layer 2004 is ensured.

[0154] S200, a protective layer 2003 is provided and attached to the side surface of the cellulose acetate film 2002 away from the substrate 2001.

[0155] After the substrate 2001 and the cellulose acetate film 2002 are bonded together through the first adhesive layer 2004, the protective layer 2003 is then placed on the side of the cellulose acetate film 2002 away from the substrate 2001. The protective layer 2003 is accurately aligned with the cellulose acetate film 2002, and the protective layer 2003 is attached to the cellulose acetate film 2002 to bond the substrate 2001, the cellulose acetate film 2002 and the protective layer 2003 together.

[0156] Specifically, a second adhesive layer 2005 can be formed on the surface of one of the protective layer 2003 and the cellulose acetate film 2002, and the other of the whole formed by the cellulose acetate film 2002 and the substrate 2001 and the protective layer 2003 is placed on the second adhesive layer 2005. After the protective layer 2003 and the cellulose acetate film 2002 are accurately aligned, the whole of the substrate 2001, the cellulose acetate film 2002 and the protective layer 2003 is pressed together to bond the protective layer 2003 and the cellulose acetate film 2002 together by the second adhesive layer 2005, so as to ensure that the protective layer 2003 and the cellulose acetate film 2002 are firmly and smoothly connected.

[0157] Similarly, a point gluing process can be used to apply UV glue or OCA (optical transparent adhesive) on the surface of the protective layer 2003 or the surface of the cellulose acetate film 2002 to form the second adhesive layer 2005. When the second adhesive layer 2005 is a UV glue layer, the first adhesive layer 2004 is irradiated by the ultraviolet lamp, and the second adhesive layer 2005 is cured by the ultraviolet light emitted by the ultraviolet lamp. Similarly, the propagation direction of the ultraviolet light emitted by the ultraviolet lamp can be selected to ensure that the second adhesive layer 2005 is completely cured by the ultraviolet light, and the protective layer 2003 and the cellulose acetate film 2002 are firmly connected.

[0158] When the substrate 2001 and the protective layer 2003 are both the polycarbonate layer a, the substrate 2001 and the protective layer 2003 have high transmittance to ultraviolet light. At this time, the ultraviolet lamp can be arranged on the side where the protective layer 2003 is located, so that the ultraviolet light emitted by the ultraviolet lamp passes through the protective layer 2003 to reach the second adhesive layer 2005. Alternatively, the ultraviolet lamp can also be arranged on the side where the substrate 2001 is located, and the ultraviolet light emitted by the ultraviolet lamp passes through the substrate 2001, the first adhesive layer 2004 and the cellulose acetate film 2002 in sequence to reach the second adhesive layer 2005. Since the protective layer 2003, the substrate 2001 and the first adhesive layer 2004 all have high light transmittance, the absorption efficiency of the second adhesive layer 2005 to ultraviolet light is high regardless of the arrangement of the ultraviolet lamp, and the second adhesive layer 2005 can be completely cured. When the ultraviolet lamp is arranged on the side where the protective layer 2003 is located, the ultraviolet light passes through fewer structural layers, the absorption rate of the second adhesive layer 2005 to ultraviolet light is fast, and the curing rate of the second adhesive layer 2005 is high.

[0159] When the protective layer 2003 is the polycarbonate layer a and the substrate 2001 is the polymethyl methacrylate layer b or the composite board, the protective layer 2003 has higher transmittance to ultraviolet light than the substrate 2001. At this time, the ultraviolet lamp can be arranged on the side where the protective layer 2003 is located, and the ultraviolet light passes through the protective layer 2003 to reach the second adhesive layer 2005. Conversely, when the substrate 2001 is the polycarbonate layer a and the protective layer 2003 is the polymethyl methacrylate layer b or the composite board, the substrate 2001 has higher transmittance to ultraviolet light than the protective layer 2003. At this time, the ultraviolet lamp can be arranged on the side where the substrate 2001 is located, and the ultraviolet light passes through the substrate 2001, the first adhesive layer 2004 and the cellulose acetate film 2002 in sequence to reach the second adhesive layer 2005. In this way, the absorption rate of the second adhesive layer 2005 to ultraviolet light can be ensured, and the second adhesive layer 2005 can be completely cured.

[0160] When the protective layer 2003 and the substrate 2001 are both the polymethyl methacrylate layer b or the composite board, the protective layer 2003 and the substrate 2001 have similar transmittance to ultraviolet light. Therefore, the ultraviolet lamp can be arranged on the side where the protective layer 2003 is located, or the ultraviolet lamp can be arranged on the side where the substrate 2001 is located. The irradiation time of the ultraviolet lamp can be appropriately prolonged to ensure that the second adhesive layer 2005 is completely cured.

[0161] With reference to any one of FIGS. 7-11, after the base 2001, the cellulose acetate film 2002, and the protective layer 2003 are laminated together, a cover bottom layer 2006 can be formed on the side of the protective layer 2003 facing away from the cellulose acetate film 2002, which is on the side surface of the housing 200 facing into the electronic device 10. For example, a plurality of ink layers can be printed or sprayed on the side of the protective layer 2003 facing away from the cellulose acetate film 2002 as the cover bottom layer 2006.

[0162] In addition, a reinforcing layer 2007 can also be formed on the outer surface of the base 2001, i.e., the side surface of the base 2001 facing away from the cellulose acetate film 2002. For example, a UV glue layer can be formed on the outer surface of the base 2001 by a flow coating or UV transfer printing technique, which, after curing, serves as the reinforcing layer 2007.

[0163] With reference to FIG. 11, when other structural layers are provided between the protective layer 2003 and the cover bottom, these structural layers can be sequentially formed on the protective layer 2003 before the cover bottom layer 2006 is formed, and finally, the cover bottom layer 2006 is formed on these structural layers.

[0164] For example, the structural layers provided between the protective layer 2003 and the cover bottom can include at least one plating layer 2008. The plating layer 2008 can be formed on the side of the protective layer 2003 facing away from the cellulose acetate film 2002, and then the cover bottom is formed on the plating layer 2008. For example, when the plating layer 2008 includes a silicon oxide layer 20081 and a zirconium oxide layer 20082, the zirconium oxide layer 20082 can be formed on the side of the protective layer 2003 facing away from the cellulose acetate film 2002, and then the silicon oxide layer 20081 is formed on the side of the zirconium oxide layer 20082 facing away from the protective layer 2003. Before the silicon oxide layer 20081 is formed, an ink layer 2009 can be printed or sprayed on the zirconium oxide layer 20082, and then the silicon oxide layer 20081 is formed on the ink layer 2009.

[0165] On this basis, the structural layers provided between the protective layer 2003 and the cover bottom can also include a UV texture layer 2010, which can be provided between the protective layer 2003 and the plating layer 2008. At this time, before the plating layer 2008 is formed on the side of the protective layer 2003 facing away from the cellulose acetate film 2002, the UV texture layer 2010 can be formed on the protective layer 2003 by a UV transfer printing process, and then the plating layer 2008 is formed on the UV texture layer 2010.

[0166] In the description of the embodiments of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be indirect connection through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0167] The terms "first", "second", "third", "fourth" and the like (if any) in the description of the embodiments of the present application and the claims and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

Claims

1. A housing of an electronic device, characterized by, The application relates to a protective layer for an acetic acid fiber film, and a manufacturing method thereof. The protective layer comprises: a base body comprising oppositely arranged outer and inner surfaces; the base body is a polycarbonate layer, a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate; an acetic acid fiber film arranged on the side of the base body where the inner surface is located; 2.The electronic device housing of claim 1, wherein, a protective layer arranged on the side of the acetic acid fiber film away from the base body; the protective layer is a polycarbonate layer, a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate. 3.The housing of the electronic device according to claim 2, wherein A first adhesive layer is arranged between the base body and the acetic acid fiber film, and a second adhesive layer is arranged between the protective layer and the acetic acid fiber film.

4. The housing of an electronic device according to any one of claims 1 to 3, characterized in that At least one of the first and second adhesive layers is a UV adhesive layer.

5. The housing of an electronic device according to any one of claims 1 to 3, characterized in that The thickness of the base body ranges from 0.30 mm to 0.45 mm, and the thickness of the protective layer ranges from 0.05 mm to 0.15 mm.

6. The housing of an electronic device according to any one of claims 1 to 3, characterized in that The thickness of the acetic acid fiber film ranges from 0.05 mm to 0.15 mm. The application further relates to a protective layer for an acetic acid fiber film, and a manufacturing method thereof. 7.The housing of the electronic device according to claim 6, wherein The protective layer further comprises: a cover bottom layer arranged on the side of the protective layer away from the acetic acid fiber film. 8.The housing of the electronic device according to claim 7, wherein, The protective layer further comprises: at least one coating layer arranged between the cover bottom layer and the protective layer. The at least one coating layer comprises: 9.The housing of the electronic device according to claim 8, wherein, a silicon oxide layer attached to the cover bottom layer; 10.The electronic device housing of claim 7, wherein, a zirconium oxide layer arranged between the silicon oxide layer and the protective layer. An ink layer is arranged between the silicon oxide layer and the zirconium oxide layer.

11. The housing of an electronic device according to any one of claims 1 to 3, characterized in that The protective layer further comprises: a UV texture layer arranged between the protective layer and the coating layer.

12. A method of manufacturing a housing of an electronic device, characterized by: The protective layer further comprises: a reinforcing layer arranged on the outer surface of the base body. The application further relates to a manufacturing method of a protective layer for an acetic acid fiber film. The manufacturing method comprises the following steps:

13. The method of producing a case of an electronic device according to claim 12, wherein providing a base body and an acetic acid fiber film, and connecting the inner surface of the base body and the acetic acid fiber film in a bonded manner; providing a protective layer, and bonding the protective layer to the side surface of the acetic acid fiber film away from the base body; wherein the base body and the protective layer are respectively a polycarbonate layer, a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate. The step of connecting the base body and the acetic acid fiber film in a bonded manner comprises the following steps: forming a first adhesive layer on the surface of one of the base body and the acetic acid fiber film; connecting the base body and the acetic acid fiber film in a bonded manner through the first adhesive layer; 14. The method of producing a case of an electronic device according to claim 13, wherein and / or, the step of bonding the protective layer to the side surface of the acetic acid fiber film away from the base body comprises the following steps: forming a second adhesive layer on the side surface of the acetic acid fiber film away from the base body; 15. The method of producing a case of an electronic device according to claim 13, wherein bonding the protective layer to the side surface of the acetic acid fiber film away from the base body through the second adhesive layer. When the base body is a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate, and the first adhesive layer is a UV adhesive layer, the step of connecting the base body and the acetic acid fiber film in a bonded manner through the first adhesive layer comprises the following steps: arranging an ultraviolet lamp on the side where the acetic acid fiber film is located, and allowing the ultraviolet light emitted by the ultraviolet lamp to pass through the acetic acid fiber film to the first adhesive layer, so as to cure the first adhesive layer. When the protective layer is a polycarbonate layer, and the second adhesive layer is a UV adhesive layer, the step of bonding the protective layer to the side surface of the acetic acid fiber film away from the base body comprises the following steps: The ultraviolet lamp is arranged on the side where the protective layer is located, and ultraviolet light emitted by the ultraviolet lamp passes through the protective layer to the second adhesive layer to solidify the second adhesive layer.

16. The method of producing a case of an electronic device according to claim 13, wherein When the base is a polycarbonate layer, the protective layer is a polymethyl methacrylate layer or a composite board composed of polycarbonate and polymethyl methacrylate, and the second adhesive layer is a UV adhesive layer, the protective layer is attached to the side surface of the cellulose acetate film away from the base, comprising: The ultraviolet lamp is arranged on the side where the base is located, and ultraviolet light emitted by the ultraviolet lamp passes through the base, the first adhesive layer and the cellulose acetate film in sequence to the second adhesive layer to solidify the second adhesive layer.

17. The method of producing a case of an electronic device according to any one of claims 12 to 16, wherein Further comprising: A cover bottom layer is formed on the side of the protective layer away from the cellulose acetate film.

18. The method of producing a case of an electronic device according to claim 17, wherein Further comprising: At least one plating layer is formed between the cover bottom layer and the protective layer.

19. The method of producing a case of an electronic device according to claim 18, wherein Further comprising: A UV texture layer is formed between the protective layer and the plating layer.

20. The method of producing a case of an electronic device according to any one of claims 12 to 16, wherein Further comprising: A reinforcing layer is formed on the outer surface of the base.

21. An electronic device, comprising: A display screen is installed in the shell. A display screen is installed in the shell.

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