The casing of electronic devices and its manufacturing method; electronic devices

Abstract

This application provides a housing for an electronic device and a method for manufacturing the same, relating to the field of electronic product technology. The housing has a cellulose acetate membrane and a protective layer sequentially disposed on the inner surface of a substrate. The cellulose acetate membrane imparts a unique texture and gloss to the housing. By using a polycarbonate layer, a polymethyl methacrylate layer, or a composite board made of polycarbonate and polymethyl methacrylate as the substrate and protective layer, and by making both the substrate and protective layer from plastic, the manufacturing cost of the housing can be reduced, thereby saving on the overall production cost of the electronic device. Furthermore, by sandwiching the cellulose acetate membrane between the substrate and the protective layer, the cellulose acetate membrane can be protected from both sides, and the gaps on both sides of the cellulose acetate membrane can be reduced, enhancing the density of the housing. This, in turn, improves the waterproof performance of the housing and enhances the reliability of both the housing and the overall electronic device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, in particular to a shell of an electronic device, a manufacturing method thereof and the electronic device. BACKGROUND

[0002] 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 to make the shell of glass or plastic with strong signal transmission capability.

[0003] 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 arranged on the acetate film as the cover bottom layer of the shell. A plating layer, a UV texture layer and other structure layers can also be arranged between the cover bottom layer and the acetate film to enhance the color effect of the shell.

[0004] However, the manufacturing cost of the shell of the existing electronic device is high, and some of them also have the problems of poor waterproof performance, affecting the texture effect of the acetate film, etc. SUMMARY

[0005] The present application provides a shell of an electronic device, a manufacturing method thereof and the 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.

[0006] The first aspect of the present application provides a shell of an electronic device, 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.

[0007] 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.

[0008] 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.

[0009] By bonding the base and the protective layer to the two sides of the acetate film through the first glue layer and the second glue layer respectively, the connection strength of the base, the acetate film and the protective layer can be ensured. 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, avoid water entering the acetate film, and ensure the appearance effect of the shell.

[0010] In a possible implementation, at least one of the first glue layer and the second glue layer is a UV glue layer.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] In one possible implementation, the thickness of the acetate film ranges from 0.05mm to 0.15mm.

[0015] 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.

[0016] In one 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.

[0017] 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.

[0018] In one 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.

[0019] 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.

[0020] In one 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.

[0021] In one possible implementation, an ink layer is disposed between the silicon oxide layer and the zirconium oxide layer.

[0022] In one possible implementation, the shell of the electronic device further includes a UV texture layer disposed between the protective layer and the plating layer.

[0023] 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.

[0024] In a possible implementation, the shell of the electronic device further includes: a reinforcing layer, disposed on the outer surface of the base body.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In a possible implementation, the method further includes: forming at least one plating layer between the cover bottom layer and the protective layer.

[0037] In a possible implementation, the method further includes: forming a UV texture layer between the protective layer and the plating layer.

[0038] In a possible implementation, the method further includes: forming a reinforcing layer on the outer surface of the base body.

[0039] 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.

[0040] 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, which is conducive to reducing the gap on both sides of the cellulose acetate film and enhancing the compactness of the cellulose acetate film on both sides. Furthermore, the waterproof performance of the shell is improved, the appearance effect of the shell is prevented from being affected due to water absorption of the cellulose acetate film, and the reliability of the shell and the whole electronic device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 FIG. 1 shows a structural schematic diagram of an electronic device according to an embodiment of the present application;

[0042] Figure 2 FIG. 2 shows an exploded structural diagram of the electronic device shown in FIG. 1; Figure 1

[0043] Figure 3 FIG. 3 shows a structural schematic diagram of another electronic device according to an embodiment of the present application;

[0044] Figure 4 FIG. 4 shows a structural schematic diagram of the electronic device shown in FIG. 3 in a folded state; Figure 3

[0045] Figure 5 Figure 3 ​​​A schematic diagram of the electronic devices in the deployed state;

[0046] Figure 6 for Figure 3 Exploded view of electronic devices in the system;

[0047] Figure 7 This is a schematic diagram of the structure of the first type of shell provided in the embodiments of this application;

[0048] Figure 8 This is a schematic diagram of the structure of the second type of shell provided in the embodiments of this application;

[0049] Figure 9 This is a schematic diagram of the structure of the third type of shell provided in the embodiments of this application;

[0050] Figure 10 This is a schematic diagram of the structure of the fourth type of shell provided in the embodiments of this application;

[0051] Figure 11 This is a structural schematic diagram of the fifth type of shell provided in the embodiments of this application;

[0052] Figure 12 A flowchart illustrating the steps of a method for manufacturing a housing according to an embodiment of this application.

[0053] Explanation of reference numerals in the attached figures:

[0054] 10-Electronic devices;

[0055] 100 - Display screen; 200 - Housing; 300 - Circuit board; 400 - Battery; 500 - Camera;

[0056] 110 - Foldable screen; 120 - Flat screen; 210 - First housing; 220 - Second housing; 230 - Hinge mechanism;

[0057] 111 - First non-bending part; 112 - Bending part; 113 - Second non-bending part; 201 - Middle frame; 202 - Back cover;

[0058] 2001 - Substrate; 2002 - Cellulose acetate film; 2003 - Protective layer; 2004 - First adhesive layer; 2005 - Second adhesive layer; 2006 - Top layer; 2007 - Reinforcing layer; 2008 - Coating layer; 2009 - Ink layer; 2010 - UV texture layer;

[0059] 20081 - Silicon oxide layer; 20082 - Zirconia layer;

[0060] a-Polycarbonate layer; b-Polymethyl methacrylate layer. Detailed Implementation

[0061] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0062] This application provides an electronic device, which can be a consumer electronics product. Exemplary examples include, but are not limited to, mobile phones, portable Android devices (PADs), laptops, laptop computers, netbooks, ultra-mobile personal computers (UMPCs), walkie-talkies, point-of-sale (POS) machines, personal digital assistants (PDAs), multimedia players, e-book readers, in-vehicle devices, wearable devices, virtual reality (VR) devices, and augmented reality (AR) devices. Wearable devices include, but are not limited to, smart bracelets, smartwatches, smart head-mounted displays, and smart glasses.

[0063] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. (Refer to...) Figure 1 As shown, taking a candybar-style electronic device 10 as an example, such as a candybar mobile phone, the electronic device 10 may include a display screen 100 and a housing 200. One side surface of the display screen 100 is used to display image information, and this side surface of the display screen 100 is generally defined as its front side, and the other side surface opposite to its front side is its back side. The housing 200 surrounds the periphery and back side of the display screen 100, and is used to support and fix the display screen 100 and provide protection. The front side of the display screen 100 is exposed outside the housing 200 so that the user can view the content displayed on the display screen 100 or perform input operations on the electronic device 10.

[0064] Figure 2 for Figure 1 The diagram shows the exploded structure of the electronic device. (Refer to...) Figure 2 As shown, when the electronic device 10 is a candybar electronic device, the housing 200 of the electronic device 10 may 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.

[0065] The display screen 100 is generally 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 rear cover 202 is generally connected to the middle frame 201 in a lapping manner, and the middle frame 201 and the rear cover 202 jointly form a receiving cavity for mounting the circuit board 300, the battery 400, the camera 500, a loudspeaker (not shown in the figure) and other devices.

[0066] Figure 3 Another structural schematic diagram of an electronic device is provided in the embodiments of the present application. Figure 4 As shown in Figure 3 a structural schematic diagram of an electronic device in a folded state. Figure 5 As shown in Figure 3 a structural schematic diagram of an electronic device in an unfolded state.

[0067] Referring to Figures 3 to 5 , taken the folding electronic device as an example, for example, the electronic device 10 is a folding mobile phone, the electronic device 10 can include at least two parts capable of relative rotation, and the electronic device 10 can have different use states in different use scenarios. The embodiments take the folding electronic device as the electronic device 10 capable of one folding as an example, the electronic device 10 includes two parts capable of mutual rotation, and the use state of the electronic device 10 is changed by the relative rotation of the two parts.

[0068] The two parts of the electronic device 10 can be relatively rotated along the arrow direction shown in Figure 3 When the two parts are rotated to be stacked with each other, the electronic device 10 is in a folded state shown in Figure 4 At this time, the volume of the electronic device 10 is small, and the electronic device 10 is convenient to carry. The two parts of the electronic device 10 can also be relatively rotated in the direction opposite to the arrow direction in Figure 3 When the two parts are rotated to be coplanar, the electronic device 10 is in an unfolded state shown in Figure 5 , and the unfolding angle α of the electronic device 10 is, for example, 180°. At this time, the electronic device 10 can realize large-screen display.

[0069] It should be noted that the angles exemplified in the embodiments are allowed to have a little deviation. For example, the unfolding angle α of the electronic device 10 is 180°, which means that the unfolding angle α can be 180°, or about 180°, such as 170°, 175°, 185° or 190°, etc. The angles exemplified in the following can be understood in the same way.

[0070] In addition, in addition to the electronic device 10 capable of one-time folding, the electronic device 10 can also be an electronic device 10 capable of more than two-time folding. At this time, the electronic device 10 can include a plurality of parts connected in sequence and rotatable, and adjacent two parts can be relatively close to be folded into a folded state, and adjacent two parts can also be relatively far apart to be unfolded into an unfolded state.

[0071] Figure 6 For Figure 3 , a disassembly structure diagram of the electronic device is shown. Referring to Figure 6 , for the folding electronic device, the electronic device 10 can also include a display screen 100 and a shell 200. The front of the display screen 100 is used to display image information, and the shell 200 is arranged around the side and back of the display screen 100, which is used to support and fix the display screen 100 and provide protection, which will not be described here.

[0072] The display screen 100 of the electronic device 10 can include a folding screen 110, and the folding screen 110 can include a first non-bending part 111, a bendable part 112 and a second non-bending part 113 arranged in sequence in 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 Figures 3 to 5 , at this time, the first direction can be the X direction shown in Figure 6 . Of course, the folding mode of the electronic device 10 can also be vertical folding, which is not limited in the present embodiment.

[0073] For example, the folding screen 110 can be made of flexible material to make the bendable part 112 bendable. The folding screen 110 can be an organic light-emitting diode (OLED) display screen 100.

[0074] 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 Figure 6 , the shell 200 includes a first shell 210, a second shell 220 and a rotating shaft mechanism 230, the rotating shaft mechanism 230 is connected between the first shell 210 and the second shell 220, and the first shell 210 and the second shell 220 are rotatably connected through the rotating shaft mechanism 230, so that the relative rotation between the first shell 210 and the second shell 220 is realized.

[0075] The first shell 210 supports and fixes the first non-bendable part 111 of the folding screen 110, the second shell 220 supports and fixes the second non-bendable part 113 of the folding screen 110, and the rotating shaft mechanism 230 supports the bendable part 112 of the folding screen 110. In other words, the first non-bendable part 111 of the folding screen 110 is fixedly connected to the first shell 210, the second non-bendable 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 rotating shaft mechanism 230.

[0076] In use, the first non-bendable part 111 and the second non-bendable part 113 of the folding screen 110 always remain in a planar state, while the bendable part 112 of the folding screen 110 can be bent. When the rotating shaft mechanism 230 drives the first shell 210 and the second shell 220 to rotate relative to each other, the first non-bendable part 111 and the second non-bendable part 113 of the folding screen 110 change their orientations accordingly, and the bendable part 112 of the folding screen 110 bends or flattens according to the change in the orientations of the first non-bendable part 111 and the second non-bendable part 113.

[0077] The first shell 210 and the second shell 220 can rotate towards each other to be relatively stacked. At this time, the shell 200 is in a folded state, and the folding screen 110 is in a folded state (as shown in FIG. 2B) along with the folding of the shell 200. The first shell 210 and the second shell 220 can also rotate away from each other to be coplanar. At this time, the shell 200 is in an unfolded state, and the folding screen 110 is in an unfolded state (as shown in FIG. 2A) along with the unfolding of the shell 200. Figure 4 Figure 5 The first shell 210 and the second shell 220 can rotate towards each other to be relatively stacked. At this time, the shell 200 is in a folded state, and the folding screen 110 is in a folded state (as shown in FIG. 2B) along with the folding of the shell 200. The first shell 210 and the second shell 220 can also rotate away from each other to be coplanar. At this time, the shell 200 is in an unfolded state, and the folding screen 110 is in an unfolded state (as shown in FIG. 2A) along with the unfolding of the shell 200.

[0078] It should be noted that the present embodiment takes the inner folding electronic device 10 as an example. When the electronic device 10 is in a folded state, the first non-bendable part 111 and the second non-bendable part 113 of the folding screen 110 are relatively attached, the shell 200 is arranged around the folding screen 110, and the folding screen 110 is located between the first shell 210 and the second shell 220. In this way, when the inner folding electronic device is in a folded state, the shell 200 can provide protection for the folding screen 110 to prevent the folding screen 110 from being scratched by a hard object.

[0079] If the inner folding electronic device needs to realize a display function in a folded state, a straight screen 120 can be additionally provided on the back of the shell 200. The electronic device 10 realizes a display function in a folded state by relying on the straight screen 120 (see FIG. 2C). Figure 3 or Figure 4 ​In other words, the display screen 100 of the inner folding electronic device can include a folding screen 110 and a straight screen 120. The folding screen 110 can be attached to the front surface of the housing 200, and the folding screen 110 can be switched between the unfolded state and the folded state as the housing 200 moves. When the electronic device 10 is in the folded state, the folding screen 110 is not visible from the outside. The straight screen 120 can be attached to the back surface of the housing 200, and the straight screen 120 displays when the electronic device 10 is in the folded state.

[0080] In other examples, the electronic device 10 can also be an outer folding electronic device. When the electronic device 10 is in the folded state, the first non-bending portion 111 and the second non-bending portion 113 of the folding screen 110 face away from each other, and the housing 200 is located between the first non-bending portion 111 and the second non-bending portion 113. In other words, when the outer folding electronic device is in the folded state, the folding screen 110 is located outside the first housing 210 and the second housing 220, and the folding screen 110 is visible to the user, and the display function can be realized by using the folding screen 110. Thus, it is not necessary to additionally increase the straight screen 120 on the back surface of the housing 200 in order to realize the display function of the electronic device 10 in the folded state.

[0081] In addition, in some embodiments, the electronic device 10, especially the inner folding electronic device, can be suspended at an angle β (see FIG. 1C) 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. The housing 200 can be suspended at a half-unfolded state between the folded state and the unfolded state by the damping force provided by the housing 200, and the folding screen 110 stays at the half-unfolded state with the housing 200. Figure 3

[0082] At this time, the bendable portion 112 of the folding screen 110 is also in the bent state, and the bending degree of the bendable portion 112 is less than the bending degree in the folded state. The first non-bending portion 111 and the second non-bending portion 113 of the folding screen 110 are relatively inclined to each other, and the included angle between the first non-bending portion 111 and the second non-bending portion 113 is, for example, 120°, 130°, 140°, or 150°, etc.

[0083] Continuing to refer to FIG. 1C, the electronic device 10 can be in the half-unfolded state, and the folding screen 110 can be in the bent state. Figure 6 ​In the housing 200 of the foldable electronic device, the first housing 210 and the second housing 220 can each include a middle frame 201, and the first non-bending portion 111 and the second non-bending portion 113 of the foldable 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 additionally arranging the straight screen 120, the first housing 210 and the second housing 220 of the electronic device 10 can each further include a back cover 202, and the back cover 202 is connected to the side surface of the middle frame 201 away from the foldable screen 110. For the inner folding electronic device additionally arranged with the straight screen 120, one of the first housing 210 and the second housing 220 can not include the back cover 202, but instead install the straight screen 120 on the back surface of the middle frame 201.

[0084] Among the first housing 210 and the second housing 220, the middle frame 201 and the back cover 202 (or the straight screen 120) jointly enclose a receiving cavity, and the receiving cavity is used to install the circuit board 300, the battery 400, the camera 500, the loudspeaker (not shown in the figure) and other devices.

[0085] As described in the background, in the related art, the housing 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 impart unique texture and luster to the housing 200 through the acetate film 2002. However, due to the high cost of glass and OCA adhesive layer, the manufacturing cost of the existing housing 200 is usually high, which is not conducive to the cost control of the whole electronic device 10. Moreover, before the housing 200 is assembled into the whole electronic device 10, and during the service of the housing 200 in the whole electronic device 10, there is also a problem that the acetate film 2002 is easy to absorb water, which affects the appearance effect and reliability of the housing 200.

[0086] 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 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, the base and the protective layer are both made of plastic, which can reduce the manufacturing cost of the shell 200, thereby saving the production cost of the entire electronic device 10. Moreover, by clamping the acetate film between the base 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. In turn, the waterproof performance of the shell 200 is improved, preventing the appearance effect of the shell 200 from being affected by water absorption of the acetate film, and improving the reliability of the shell 200 and the entire electronic device 10.

[0087] The shell 200 of the electronic device 10 of the embodiments of the present application is described in detail below.

[0088] For example, the electronic device 10 is a straight-line electronic device as described above, and specifically, the back cover 202 in the shell 200 can be improved. For example, the electronic device 10 is a folding electronic device as described above, and specifically, the back cover 202 in the first shell 210 and the second shell 220 can be improved. 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.

[0089] Figure 7 The first shell structure provided by the embodiments of the present application is schematically shown. Figure 8 The second shell structure provided by the embodiments of the present application is schematically shown. Figure 9 The third shell structure provided by the embodiments of the present application is schematically shown. Figure 10 The fourth shell structure provided by the embodiments of the present application is schematically shown.

[0090] Reference Figures 7 to 10In any of the embodiments, the shell 200 can include a base body 2001, an acetate film 2002, and a protective layer 2003 arranged in sequence. The two side surfaces of the base body 2001 in the thickness direction are respectively an outer surface and an inner surface. The outer surface of the base body 2001 faces the outside world, and the inner surface of the base body 2001 faces the inside of the electronic device 10. Taking the rear cover 202 in the electronic device 10 described above as an example, the outer surface of the base body 2001 can face away from the middle frame 201, and the inner surface of the base body 2001 can face the middle frame 201. The acetate film 2002 and the protective layer 2003 are arranged in sequence on the side where the inner surface of the base body 2001 is located.

[0091] 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, and is used to make the shell 200 have sufficient structural strength to ensure the stability and reliability of the shell 200 and to protect 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.

[0092] The base body 2001 can be a transparent structure, and the light transmittance of the base body 2001 can reach more than 90%. The appearance effect of the shell 200 is mainly presented by the acetate film 2002 located on the inner side of 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 arranging the acetate film 2002 on the inner side 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.

[0093] 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, and cutting from a 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.

[0094] The natural mineral powder can be mixed into the cellulose acetate raw material to form a powder-like raw material. The addition of the natural mineral powder can make the cellulose acetate film 2002 exhibit a special natural texture and glossiness to enhance the appearance effect of the shell 200. For example, the natural concha material can be mixed into the cellulose acetate raw material to make the shell 200 exhibit a glossiness very close to that of a pearl.

[0095] It can be understood that the cellulose acetate film 2002 exhibits a very natural texture and glossiness by adding the natural mineral powder to the cellulose acetate raw material. At the same time, the cellulose acetate film 2002 is easy to stretch and deform due to the good plasticity and strong deformation ability of the cellulose acetate raw material, and can form an infinitely variable and unique texture effect.

[0096] The thickness of the cellulose acetate film 2002 can be reduced by stretching the cellulose acetate plate after the pressing plate is formed, for example, by stretching the cellulose acetate plate in the transverse direction and in the longitudinal direction. Moreover, the direction, profile and gloss of the texture on the cellulose acetate plate will change, and each cellulose acetate film 2002 formed ultimately exhibits a unique texture and gloss. Thus, each electronic device 10 configured with the shell 200 can exhibit a unique appearance effect.

[0097] For example, the two different colored powder-like raw materials of the cellulose acetate film 2002 can be close in color, and the texture formed by the cellulose acetate film 2002 can vary in depth or be interlaced with light and shade. Thus, the shell 200 of the electronic device 10 has a texture effect with color systems close to each other and interlaced with light and shade. Alternatively, the two different colored cellulose acetate raw materials can have a large difference in color, and the texture formed by the cellulose acetate film 2002 can be interlaced with two colors and unique in variation. Thus, the shell 200 of the electronic device 10 has a texture effect with two colors interlaced and unique in vision.

[0098] Since the cellulose acetate film 2002 uses cellulose acetate as the base material 2001, it is easy to absorb water compared to a plate material with a larger density and higher hardness. If the cellulose acetate film 2002 absorbs too much water, it will affect the texture and gloss of the cellulose acetate film 2002, and thus affect the appearance effect of the shell 200. If the cellulose acetate film 2002 absorbs too much water, it may also affect the connection strength between the cellulose acetate film 2002 and the structure layers on both sides thereof, and thus affect the stability and reliability of the shell 200 and the service life of the shell 200.

[0099] To this end, the embodiment further provides a protective layer 2003 on the side of the cellulose acetate film 2002 away from the substrate 2001. The protective layer 2003 can also have a certain thickness and good hardness and mechanical strength. The substrate 2001 and the protective layer 2003 sandwich the cellulose acetate film 2002 therebetween to form a sandwich structure. The substrate 2001 and the protective layer 2003 are closely attached to the two sides of the cellulose acetate film 2002, respectively. For the substrate 2001 and the protective layer 2003 having sufficient hardness and mechanical strength, the density of the substrate 2001 and the protective layer 2003 is relatively large, which can reduce the gaps on the two sides of the cellulose acetate film 2002 and ensure the compactness of the two sides of the cellulose acetate film 2002, thereby protecting the two sides of the cellulose acetate film 2002.

[0100] Therefore, the sandwich structure of the substrate 2001 and the protective layer 2003 sandwiching the cellulose acetate film 2002 therebetween can improve the waterproof performance of the shell 200. The external water vapor is prevented from entering the cellulose acetate film 2002, and the cellulose acetate film 2002 is prevented from absorbing water to affect the texture and gloss, thereby ensuring the appearance effect of the shell 200. In addition, the connection strength between the cellulose acetate film 2002 and the substrate 2001 and the protective layer 2003 on the two sides thereof is ensured, and the stability and reliability of the shell 200 are improved, thereby prolonging the service life of the shell 200.

[0101] For example, during the use of the electronic device 10, the two sides of the cellulose acetate film 2002 are closely attached to the substrate 2001 and the protective layer 2003, respectively, the gaps on the two sides of the cellulose acetate film 2002 are small, and the compactness of the two sides of the cellulose acetate film 2002 is high. The external water vapor is prevented from entering the cellulose acetate film 2002 from the outer surface (the side where the substrate 2001 is located) of the shell 200. In addition, due to the small gaps on the two sides of the cellulose acetate film 2002, the overall density of the sandwich structure of the cellulose acetate film 2002, the substrate 2001, and the protective layer 2003 is large, and the external water vapor is also prevented from entering the cellulose acetate film 2002 from the circumferential side of the shell 200, the water is prevented from entering the side wall of the shell 200, and the water entering problem caused by the assembly mode of the shell 200 and the middle frame 201 is avoided.

[0102] Before the shell 200 is assembled to the electronic device 10, the sandwich structure of the substrate 2001 and the protective layer 2003 sandwiching the cellulose acetate film 2002 therebetween can also prevent the external water vapor from entering the cellulose acetate film 2002 from the two side surfaces of the shell 200. The texture and gloss effect of the cellulose acetate film 2002 are ensured, and the appearance strength of the shell 200 is ensured. In addition, the protective layer 2003 can enhance the structural strength of the shell 200, the connection strength between the cellulose acetate film 2002 and the substrate 2001 and the protective layer 2003 on the two sides thereof is high, the stability and reliability of the shell 200 are improved, and the shell 200 is prevented from being damaged.

[0103] The base 2001 can be made of polycarbonate (PC), and the base 2001 is a polycarbonate layer a. The polycarbonate has high transparency, and can meet the light transmittance requirement of the base 2001. In addition, the polycarbonate has other advantages such as high impact strength, good toughness, good fatigue resistance, good dimensional stability, and wide use temperature range, and can improve the reliability and service life of the shell 200.

[0104] Alternatively, the base 2001 can be made of poly (methyl methacrylate) (PMMA), and the base 2001 is a poly (methyl methacrylate) layer b. The poly (methyl methacrylate) has high transparency, and can meet the light transmittance requirement of the base 2001. In addition, the poly (methyl methacrylate) 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.

[0105] Alternatively, the base 2001 can be made of polycarbonate and poly (methyl methacrylate), and the base 2001 is a composite board made of polycarbonate and poly (methyl methacrylate). In this way, on the basis of ensuring high light transmittance of the base 2001, the composite board as the base 2001 has both impact toughness of the polycarbonate and high hardness and wear resistance of the poly (methyl methacrylate), and can further improve the reliability and service life of the shell 200.

[0106] When the base 2001 is a composite board made of polycarbonate and poly (methyl methacrylate), the polycarbonate layer a and the poly (methyl methacrylate) layer b can be co-extruded and extruded into the composite board as the base 2001. In this way, the base 2001 has good integrity and high structural strength without using adhesives between layers, which is conducive to improving the stability and reliability of the shell 200. In addition, since no adhesives are used, there is no problem of solvent residue, and the base 2001 has no odor.

[0107] Taking an example of the base 2001 including one polycarbonate layer a and one poly (methyl methacrylate) layer b, the poly (methyl methacrylate) 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.

[0108] Similar 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 polymethyl methacrylate, and the protective layer 2003 is a polymethyl methacrylate layer b, which has high hardness and good wear resistance. Alternatively, the protective layer 2003 can be made of a composite of polycarbonate and polymethyl methacrylate, and the protective layer 2003 is a composite board made of a composite of polycarbonate and polymethyl methacrylate, which has the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. Details are not described herein.

[0109] For example, when the protective layer 2003 is a composite board made of a composite of polycarbonate and polymethyl methacrylate, 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. Details are not described herein.

[0110] 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 made of a composite 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.

[0111] By using the polycarbonate layer a, the polymethyl methacrylate layer b, or the composite board made of a composite 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.

[0112] The thickness of the base 2001 can be in the range of 0.30mm-0.45mm, or in other words, the thickness of the base 2001 can be between 0.30mm and 0.45mm. In this way, the base 2001 has sufficient thickness to meet the structural strength requirements of the base 2001. Further, the structural strength of the shell 200 is ensured, the stability and reliability of the shell 200 are ensured, and the service life of the shell 200 is ensured. 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.

[0113] 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 0.30 mm and 0.45 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.

[0114] For example, 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.

[0115] 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 less 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 small, which can thin the overall thickness of the shell 200, and is conducive to the slimming of the electronic device 10.

[0116] 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.

[0117] For example, 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.

[0118] The thickness of the cellulose acetate film 2002 can range from 0.05 mm to 0.15 mm, or 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 and gloss, and avoid the structure layer provided on the side of the cellulose acetate film 2002 away from the base 2001 affecting the appearance of the shell 200. Moreover, the thickness of the cellulose acetate film 2002 is small, and for cellulose acetate films 2002 that have strong deformation ability and small structural strength, the cellulose acetate film 2002 can avoid being too thick and affecting the structural strength of the shell 200, ensuring the stability and reliability of the shell 200.

[0119] For example, the thickness of the cellulose acetate film 2002 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.

[0120] Referring to Figure 7 As shown in the figure, the base 2001 is a composite board composed of a layer of polycarbonate layer a and a layer of polymethyl methacrylate layer b. The polymethyl methacrylate layer b is located on the side where the outer surface of the base 2001 is located, and the polycarbonate layer a is located on the side where the inner surface of the base 2001 is located. Moreover, the protective layer 2003 is a polycarbonate layer a.

[0121] In this way, the base 2001 has 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 a protective layer 2003 with a small thickness and has the impact toughness of polycarbonate. Thus, the reliability and service life of the shell 200 can be improved.

[0122] Referring to Figure 8 As shown in the figure, the base 2001 is a composite board composed of a layer of polycarbonate layer a and a layer of polymethyl methacrylate layer b. The polymethyl methacrylate layer b is located on the side where the outer surface of the base 2001 is located, and the polycarbonate layer a is located on the side where the inner surface of the base 2001 is located. Moreover, the protective layer 2003 is a composite board composed of a layer of polycarbonate layer a and a layer of polymethyl methacrylate layer b.

[0123] In this way, the base 2001 has the impact toughness of polycarbonate and the high hardness and wear resistance of polymethyl methacrylate. Similarly, the protective layer 2003 has 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.

[0124] Referring to Figure 9 As shown in the drawings, the base 2001 is a polycarbonate layer a, and the protective layer 2003 is also a polycarbonate layer a. In this way, the base 2001 and the protective layer 2003 both have the impact toughness of polycarbonate. Moreover, the base 2001 and the protective layer 2003 are both single-layer polycarbonate layers a, which facilitates the processing of the base 2001 and the protective layer 2003 and helps to improve the manufacturing efficiency of the shell 200.

[0125] Referring to Figure 10 As shown in the drawings, the base 2001 is a polycarbonate layer a. Moreover, the protective layer 2003 is a composite board composed of a polycarbonate layer a and a polymethyl methacrylate layer b. In the protective layer 2003 shown in the drawings, the polycarbonate layer a is located on the side of the protective layer 2003 facing the acetate film 2002, and the polymethyl methacrylate layer b is located on the side of the protective layer 2003 facing away from the acetate film 2002.

[0126] In this way, the base 2001 has the impact toughness of polycarbonate. Moreover, the base 2001 is a single-layer polycarbonate layer a, which facilitates the processing of the base 2001. The protective layer 2003 has 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.

[0127] Referring to Figures 7 to 10 As shown in any of the drawings, since the base 2001 and the protective layer 2003 are both thin plate members with high hardness and rigidity, and the acetate film 2002 is a thin film with good elasticity and strong deformation ability, in order to connect the base 2001, the 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 acetate film 2002 by an adhesive to achieve the close connection of the three and ensure the integrity and stability of the shell 200.

[0128] The first adhesive layer 2004 can be arranged between the base 2001 and the acetate film 2002, and the base 2001 and the 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 acetate film 2002, and the protective layer 2003 and the 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 on both sides of the acetate film 2002, so as to ensure the connection strength between the three.

[0129] The acetate film 2002 is clamped by the first adhesive layer 2004 and the second adhesive layer 2005, so as to reduce the gap on both sides of the acetate film 2002 and ensure the compactness of the acetate film 2002. In addition, the base 2001 and the protective layer 2003 on both sides of the acetate film 2002 are high-density structural members, which can provide good protection for the acetate film 2002. In this way, the external water vapor can be prevented from entering the 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 acetate film 2002 and ensure the appearance effect of the shell 200.

[0130] 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 light curing adhesive, photosensitive adhesive or shadowless adhesive, refers to a kind of adhesive that must be cured by ultraviolet light. The curing method of UV adhesive is simple, the curing speed is fast and the cost is low. By using UV adhesive to bond at least one of the base 2001 and the protective layer 2003 to the acetate film 2002, the production efficiency of the shell 200 can be improved, and the production cost of the shell 200 can be reduced. Therefore, it is beneficial to reduce the production cost of the entire electronic device 10.

[0131] For example, the first adhesive layer 2004 between the base 2001 and the acetate film 2002 is a UV adhesive layer, and the second adhesive layer 2005 between the protective layer 2003 and the acetate film 2002 is also a UV adhesive layer. Alternatively, the first adhesive layer 2004 between the base 2001 and the acetate film 2002 is a UV adhesive layer, and the second adhesive layer 2005 between the protective layer 2003 and the acetate film 2002 is an adhesive layer of other types. Alternatively, the first adhesive layer 2004 between the base 2001 and the acetate film 2002 is an adhesive layer of other types, and the second adhesive layer 2005 between the protective layer 2003 and the acetate film 2002 is a UV adhesive layer. Of course, the first adhesive layer 2004 between the base 2001 and the acetate film 2002 and the second adhesive layer 2005 between the protective layer 2003 and the acetate film 2002 can also be adhesive layers of other types.

[0132] When at least one of the first adhesive layer 2004 and the second adhesive layer 2005 is selected as other type of adhesive layer, the adhesive layer can be an OCA adhesive layer. The OCA (Optically Clear Adhesive) has high light transmittance, high adhesion, and good weather resistance, water resistance, high temperature resistance, and ultraviolet resistance. Using the OCA adhesive to connect at least one of the base 2001 and the protective layer 2003 to the acetate film 2002 can ensure the bonding strength between the three, and ensure the integrity and structural strength of the shell 200.

[0133] Continuing to refer to Figures 7 to 10 According to any of the above, the shell 200 further includes a cover bottom layer 2006, which is arranged on the side of the protective layer 2003 away from the acetate film 2002. The cover bottom layer 2006 can be located on the side surface of the shell 200 facing the electronic device 10, or in other words, the cover bottom layer 2006 serves as the inner surface layer of the shell 200. The cover bottom layer 2006 generally includes multiple ink layers, and by printing or spraying multiple ink layers on the inner surface of the shell 200, the shell 200 can be protected to prevent the structural layer below the cover bottom layer 2006 from being scratched or marred.

[0134] The cover bottom layer 2006 corresponds to the primer layer of the shell 200. For the multiple ink layers included in the cover bottom layer 2006, the multiple ink layers can include an ink layer located on the surface layer of the shell 200 and multiple ink layers 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. This provides a primer layer that is uniform in color and opaque, which can ensure the appearance effect of the shell 200. Avoiding using a colored ink layer as the cover bottom layer 2006 can prevent affecting the color and texture of other structural layers of the shell 200 and prevent affecting the appearance effect of the shell 200.

[0135] For example, the cover bottom layer 2006 can include a flame-retardant ink layer. Flame-retardant ink is ink with a flame retardant added to improve the flame-retardant properties of the ink layer. In this way, accidental fires of the shell 200 can be prevented, and the safety and reliability of the shell 200 can be improved.

[0136] Continuing to refer to Figures 7 to 10As shown in any one of the embodiments, the housing 200 may further include a reinforcing layer 2007, which is disposed on the outer surface of the substrate 2001. The reinforcing layer 2007 may be located on the side of the housing 200 facing away from the electronic device 10, or in other words, the reinforcing layer 2007 serves as the outer surface layer of the housing 200. The reinforcing layer 2007 is mainly used to harden the outer surface of the housing 200 to enhance its hardness and wear resistance. This improves the stability and reliability of the housing 200 and extends its service life. For example, a UV adhesive layer may be formed on the outer surface of the substrate 2001 using a coating or UV transfer printing technique; this UV adhesive layer, after curing, serves as the reinforcing layer 2007.

[0137] Furthermore, a silkscreen texture can be formed on the surface of the reinforcing layer 2007 facing the substrate 2001, or on any surface of the substrate 2001 (the outer surface or the inner surface of the substrate 2001). This silkscreen texture can be, for example, a logo pattern of the electronic device 10. Alternatively, an etching texture can be formed on any surface of the substrate 2001 using a laser etching process. This etching texture can also be, for example, a logo pattern of the electronic device 10.

[0138] Figure 11 This is a structural schematic diagram of the fifth type of housing provided in an embodiment of this application. (Refer to...) Figure 11 As shown in the figure, the substrate 2001 is a composite plate and the protective layer 2003 is a polycarbonate layer a, as an example. In some embodiments, other film layers can be provided between the bottom cover 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 extend the service life of the shell 200.

[0139] At least one coating layer 2008 may be provided between the bottom cover 2006 and the protective layer 2003. The addition of the coating layer 2008 improves the performance of the housing 200. For example, it can enhance the hardness of the housing 200, improve the impact resistance of the housing 200, and improve the oxidation resistance and durability of the housing 200.

[0140] For example, the coating layer 2008 disposed between the bottom cover 2006 and the protective layer 2003 may include a silicon oxide layer 20081, which is, for example, attached to the bottom cover 2006. Silicon oxide (SiO2) is a major material for manufacturing glass and ceramics, and it has good stability, high strength, high hardness, wear resistance, and anti-aging properties. By adding a silicon oxide layer 20081 to the housing 200, the strength and hardness of the housing 200 can be improved, its wear resistance and anti-aging properties can be enhanced, water ingress into the housing 200 can be prevented, and its flame retardant properties can also be improved. Therefore, the stability and reliability of the housing 200 can be improved, and its service life can be extended.

[0141] On the basis of 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 (ZrO2) belongs to ceramic materials, which has electrical, magnetic, thermal, optical and other properties. Zirconium oxide has the advantages of high hardness, high dielectric constant, good stability, corrosion resistance, oxidation resistance and the like. By adding the zirconium oxide layer 20082 in the shell 200, the shell 200 can be more solid and wear-resistant, not shield the signal, and have good heat dissipation, which can improve the reliability and service life of the shell 200.

[0142] The 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. In the process of forming the zirconium oxide layer 20082 and the silicon oxide layer 20081, mutual influence and mutual interference are avoided, and the performance of the silicon oxide layer 20081 and the zirconium oxide layer 20082 is ensured.

[0143] Continuing to refer to Figure 11 The shell 200 can also be provided with a UV texture layer 2010, which can be arranged between the protective layer 2003 and the coating layer 2008. For example, the UV texture layer 2010 can be formed on the protective layer 2003. The required texture can be formed on the mold, the UV glue is added on the mold, and then the protective layer 2003 is covered on the mold. After rolling, light curing and other processes, the protective layer 2003 is peeled off from the mold. In this way, the texture on the mold can be completely copied to the protective layer 2003 through the UV glue, so as to realize UV transfer printing and form the UV texture layer 2010.

[0144] By arranging the UV texture layer 2010 between the protective layer 2003 and the coating layer 2008, the UV texture formed on the protective layer 2003 can enhance the adhesion between the coating 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 on the texture effect of the acetate film 2002 through the protective layer 2003, so as to improve the appearance effect of the shell 200.

[0145] The application embodiment also provides a manufacturing method of the shell 200 of the electronic device 10 (hereinafter referred to as the manufacturing method), which is used for manufacturing the shell 200 of the electronic device 10. The manufacturing method will be described in detail below.

[0146] Figure 12 The shell manufacturing method provided in the application embodiment is shown in the step flow chart. Referring toFigure 12 The manufacturing method includes the following steps:

[0147] S100, providing a base 2001 and a cellulose acetate film 2002, and connecting the inner surface of the base 2001 and the cellulose acetate film 2002.

[0148] Combining Figures 7-11 According to any of the above, first, provide the base 2001 and the cellulose acetate film 2002, and stack and accurately align the base 2001 and the cellulose acetate film 2002. Then, connect the base 2001 and the cellulose acetate film 2002 to form an integral whole.

[0149] Among them, the cellulose acetate film 2002 can be made first. The manufacturing process of the cellulose acetate film 2002 is described below.

[0150] As described above, the powder raw material can be provided first. The powder raw material can only include cellulose acetate raw material. Alternatively, natural mineral powder can be added to the cellulose acetate raw material, and the two can be mixed into a powder raw material. Different colored toners are mixed with the powder raw material to form at least two different colored powder raw materials. Below, the cellulose acetate film 2002 is formed from two colored powder raw materials, and the two colored powder raw materials are specifically taken as A raw material and B raw material for example, and the manufacturing process is described below.

[0151] After forming the A raw material and the B raw material, the A raw material and the B raw material are respectively added to the solvent, and the A raw material and the B raw material are kneaded (the process can be carried out in a kneading machine) to ensure that the A raw material and the B raw material are evenly kneaded, and the A raw material and the B raw material are formed. The A block and the B block are soft and large in size. Ensure that the A block and the B block are evenly colored and stand for a period of time.

[0152] Then, the A block and the B block are cut to form A large pieces and B large pieces. The A large pieces and the B large pieces are further cut to form A small pieces and B small pieces. According to the forming requirements of the cellulose acetate film 2002, the A small pieces and the B small pieces in the form of small pieces will be further processed. The A small pieces and the B small pieces are extruded and cut into granular or short columnar shape to form A particles and B particles. For example, the length of the A particles and the B particles is about 25mm.

[0153] After the A particles and the B particles are dried, the next step of mixing is performed. According to the texture requirements of the acetate film 2002, the A particles and the B particles can be mixed uniformly, or the A particles and the B particles can be placed in a specific pattern. For example, the A particles and the B particles are alternately arranged from the center to the outside, so that the acetate film 2002 forms a radial texture effect. Then, the A particles and the B particles are heated and pressed to form an acetate board with a large planar size and a large thickness. The acetate board is dried, baked, and leveled to form a dry and flat acetate board.

[0154] Next, the acetate board is subjected to a stretching process, which can include at least one horizontal stretching and at least one vertical stretching. In this process, the acetate board with a large size and a large thickness is stretched into an acetate sheet with a larger size and a thinner thickness. At the same time, as the thickness of the acetate board continuously decreases, the texture on the acetate board also continuously changes, and the final acetate sheet presents the appearance texture of the shell 200. Finally, the acetate sheet is cut to form an acetate film 2002 with a required size.

[0155] Taking the A particles as white particles and the B particles as light gray particles as an example, the acetate film 2002 formed after the A particles and the B particles are uniformly mixed, 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.

[0156] As for the 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, and 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 by the first adhesive layer 2004, so as to ensure that the base 2001 and the acetate film 2002 are connected firmly and flatly.

[0157] The point dispensing 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 glue layer 2004. When the first glue 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 glue layer 2004 needs to be irradiated by a UV lamp. The UV light emitted by the UV lamp is used to cure the first glue layer 2004. In addition, the propagation direction of the UV light emitted by the UV lamp can be selected to ensure that the UV light completely cures the first glue layer 2004 and ensures that the base 2001 and the acetate film 2002 are firmly connected.

[0158] When the base 2001 is the aforementioned polycarbonate layer a, the base 2001 has a high transmittance to UV light. At this time, the UV lamp can be arranged on the side where the base 2001 is located, and the UV light emitted by the UV lamp passes through the base 2001 to reach the first glue layer 2004. Alternatively, the UV lamp can also be arranged on the side where the acetate film 2002 is located, and the UV light emitted by the UV lamp passes through the acetate film 2002 to reach the first glue layer 2004. Whether the UV light passes through the base 2001 to reach the first glue layer 2004 or the UV light passes through the acetate film 2002 to reach the first glue layer 2004, the first glue layer 2004 has a high absorption rate to the UV light, which can ensure that the first glue layer 2004 is completely cured.

[0159] When the base 2001 is the aforementioned polymethyl methacrylate layer b or the composite board, the acetate film 2002 has a higher transmittance to UV light than the base 2001. At this time, the UV lamp can be arranged on the side where the acetate film 2002 is located, and the UV light emitted by the UV lamp passes through the acetate film 2002 to reach the first glue layer 2004. This ensures that the first glue layer 2004 has a high absorption rate to the UV light, which guarantees that the first glue layer 2004 is completely cured.

[0160] S200, a protective layer 2003 is provided and attached to the side surface of the acetate film 2002 away from the base 2001.

[0161] After the base 2001 and the acetate film 2002 are bonded together through the first glue layer 2004, the protective layer 2003 is placed on the side of the acetate film 2002 away from the base 2001. The protective layer 2003 is accurately aligned with the acetate film 2002, and the protective layer 2003 is attached and connected with the acetate film 2002, so that the base 2001, the acetate film 2002 and the protective layer 2003 are attached together.

[0162] Specifically, the 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 one of the cellulose acetate film 2002 and the substrate 2001 formed as a whole and the protective layer 2003 can be placed on the second adhesive layer 2005. After the protective layer 2003 and the cellulose acetate film 2002 are accurately aligned, the substrate 2001, the cellulose acetate film 2002 and the protective layer 2003 are 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.

[0163] Similarly, the UV adhesive or OCA (optical transparent adhesive) can also be coated on the surface of the protective layer 2003 or the surface of the cellulose acetate film 2002 by the dispensing process to form the second adhesive layer 2005. When the second adhesive layer 2005 is the UV adhesive 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.

[0164] When the substrate 2001 and the protective layer 2003 are both the aforementioned 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 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 have high transmittance, the absorption efficiency of the second adhesive layer 2005 to the ultraviolet light is high regardless of the arrangement of the ultraviolet lamp, so that 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 the ultraviolet light is fast, and the curing rate of the second adhesive layer 2005 is high.

[0165] When the protective layer 2003 is the aforementioned polycarbonate layer a, the base 2001 is the aforementioned polymethyl methacrylate layer b or the composite board, the protective layer 2003 has a higher transmittance of ultraviolet light than the base 2001. At this time, the ultraviolet lamp can be arranged on the side of the protective layer 2003, and the ultraviolet light passes through the protective layer 2003 to reach the second adhesive layer 2005. Conversely, when the base 2001 is the aforementioned polycarbonate layer a, the protective layer 2003 is the aforementioned polymethyl methacrylate layer b or the composite board, the base 2001 has a higher transmittance of ultraviolet light than the protective layer 2003. At this time, the ultraviolet lamp can be arranged on the side of the base 2001, and the ultraviolet light passes through the base 2001, the first adhesive layer 2004 and the 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 the ultraviolet light can be ensured, and the complete curing of the second adhesive layer 2005 can be ensured.

[0166] When the protective layer 2003 and the base 2001 are both the aforementioned polymethyl methacrylate layer b or the composite board, the protective layer 2003 and the base 2001 have a comparable transmittance of ultraviolet light. Therefore, the ultraviolet lamp can be arranged on the side of the protective layer 2003 or the side of the base 2001. The irradiation time of the ultraviolet lamp can be appropriately extended to ensure the complete curing of the second adhesive layer 2005.

[0167] In combination Figures 7 to 11 In any of the above, after the base 2001, the acetate film 2002 and the protective layer 2003 are attached together, a cover bottom layer 2006 can be formed on the side of the protective layer 2003 away from the acetate film 2002, and the cover bottom layer 2006 is located on the side surface of the shell 200 facing the inside of the electronic device 10. For example, a plurality of ink layers can be printed or sprayed on the side of the protective layer 2003 away from the acetate film 2002 as the cover bottom layer 2006.

[0168] In addition, a reinforcing layer 2007 can also be formed on the outer surface of the base 2001, that is, the side surface of the base 2001 away from the acetate film 2002. For example, a UV adhesive layer can be formed on the outer surface of the base 2001 by flow coating or UV transfer printing technology, and the UV adhesive layer becomes the reinforcing layer 2007 after curing.

[0169] In combination Figure 11 In any of the above, when other structural layers are arranged 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.

[0170] For example, the structure layer 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 away from the 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 away from the acetate film 2002, and then the silicon oxide layer 20081 is formed on the side of the zirconium oxide layer 20082 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.

[0171] On this basis, the structure layer between the protective layer 2003 and the cover bottom can further include a UV texture layer 2010, and the UV texture layer 2010 can be arranged 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 away from the acetate film 2002, the UV texture layer 2010 can be formed on the protective layer 2003 by a UV transfer process, and then the plating layer 2008 is formed on the UV texture layer 2010.

[0172] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship between 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.

[0173] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the embodiments of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

Claims

1. An electronic device comprising a display screen and a housing, characterized in that, The shell comprises: a base body comprising an outer surface and an inner surface arranged oppositely; the base body is a composite board composed of polycarbonate and polymethyl methacrylate; an acetate film arranged on the side of the inner surface of the base body; a protective layer arranged on the side of the acetate film away from the base body; the protective layer is a composite board composed of polycarbonate and polymethyl methacrylate; a first adhesive layer arranged between the base body and the acetate film, and a second adhesive layer arranged between the protective layer and the acetate film; a cover bottom layer arranged on the side of the protective layer away from the acetate film; at least one coating layer arranged between the cover bottom layer and the protective layer; at least one of the coating layers comprises: a silicon oxide layer attached to the cover bottom layer; a zirconium oxide layer arranged between the silicon oxide layer and the protective layer; an ink layer arranged between the silicon oxide layer and the zirconium oxide layer; a UV texture layer arranged between the protective layer and the coating layer, and formed on the protective layer; a reinforcing layer arranged on the outer surface of the base body.

2. The electronic device of claim 1, wherein, At least one of the first adhesive layer and the second adhesive layer is a UV adhesive layer.

3. The electronic device of claim 1 or 2, wherein, The thickness of the base body ranges from 0.30mm to 0.45mm, and the thickness of the protective layer ranges from 0.05mm to 0.15mm.

4. The electronic device of claim 1 or 2, wherein, The thickness of the acetate film ranges from 0.05mm to 0.15mm.

5. The electronic device of claim 1 or 2, wherein, The display screen is mounted on the shell.

6. A method of manufacturing a housing of an electronic device, the housing being for mounting a display screen of the electronic device, characterized by, Comprises: providing a base body and an acetate film, and connecting the inner surface of the base body and the acetate film in a fit manner; providing a protective layer and attaching the protective layer to the side surface of the acetate film away from the base body in a fit manner; forming a cover bottom layer on the side of the protective layer away from the acetate film; wherein the base body and the protective layer are respectively composite boards composed of polycarbonate and polymethyl methacrylate; connecting the base body and the acetate film in a fit manner, comprising: forming a first adhesive layer on the surface of one of the base body and the acetate film; connecting the base body and the acetate film in a fit manner through the first adhesive layer; attaching the protective layer to the side surface of the acetate film away from the base body in a fit manner, comprising: forming a second adhesive layer on the side surface of the acetate film away from the base body; attaching the protective layer to the side surface of the acetate film away from the base body in a fit manner through the second adhesive layer; The method further comprises: forming at least one coating layer between the cover bottom layer and the protective layer; at least one of the coating layers comprises: a silicon oxide layer attached to the cover bottom layer; and a zirconium oxide layer arranged between the silicon oxide layer and the protective layer; forming an ink layer between the silicon oxide layer and the zirconium oxide layer; forming a UV texture layer between the protective layer and the coating layer, and the UV texture layer is formed on the protective layer; forming a reinforcing layer on the outer surface of the base body.

7. The method of producing a case of an electronic device according to claim 6, wherein When the first adhesive layer is a UV adhesive layer, connecting the base body and the acetate film in a fit manner through the first adhesive layer comprises: An ultraviolet lamp is arranged on the side where the cellulose acetate membrane is located, and the ultraviolet light emitted by the ultraviolet lamp passes through the cellulose acetate membrane to the first adhesive layer to cure the first adhesive layer.

Images