CN107864581B

CN107864581B - Shell manufacturing method, shell and electronic equipment

Info

Publication number: CN107864581B
Application number: CN201711052519.4A
Authority: CN
Inventors: 陈明仁; 侯体波
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2020-03-06
Anticipated expiration: 2037-10-30
Also published as: CN107864581A

Abstract

The embodiment of the application discloses a shell manufacturing method, a shell and electronic equipment, wherein the shell manufacturing method comprises the following steps: providing a shell substrate, and carrying out oxidation treatment on the outer surface of the shell substrate to form an oxide film on the outer surface of the shell substrate; sequentially dyeing the oxide film with a first color from the fourth edge to the second edge, wherein the dyeing time is sequentially reduced, the first color is formed on the oxide film, and the first color gradually becomes lighter from the fourth edge to the second edge; and sequentially dyeing the second color on the oxide film from the second side to the fourth side, wherein the dyeing time is sequentially reduced, the second color is formed on the oxide film, and the second color gradually becomes lighter from the second side to the fourth side, so that a first color close to the fourth side, a second color close to the second side and a superposed color between the fourth side and the second side are formed on the oxide film. The embodiment of the application can reduce the process.

Description

Shell manufacturing method, shell and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a shell manufacturing method, a shell and electronic equipment.

Background

At present, in order to meet the requirements of different users, the colors of shells of electronic devices, such as mobile phones and tablet computers, are different, and in the prior art, the processes of multiple oxidation, multiple dyeing and the like are required in the manufacturing process of the shell colors, which is often complex.

Disclosure of Invention

The embodiment of the application provides a shell manufacturing method, a shell and electronic equipment, which can reduce shell manufacturing procedures.

In a first aspect, an embodiment of the present application provides a method for manufacturing a housing, where the housing is applied to an electronic device, and the method for manufacturing the housing includes:

providing a shell substrate, wherein the shell substrate comprises a first edge, a second edge, a third edge and a fourth edge which are connected end to end;

performing oxidation treatment on the outer surface of the shell substrate to form an oxide film on the outer surface of the shell substrate;

sequentially performing dyeing treatment of a first color on the oxide film from the first edge to the third edge, wherein the dyeing time is sequentially reduced, so that a first color is formed on the oxide film, and the first color gradually becomes lighter from the first edge to the third edge;

and sequentially dyeing the second color on the oxide film from the third edge to the first edge, wherein the dyeing time is sequentially reduced, the second color is formed on the oxide film, and the second color gradually becomes lighter from the third edge to the first edge, so that the first color close to the first edge, the second color close to the third edge and a superposed color between the first edge and the third edge are formed on the oxide film.

In a second aspect, embodiments of the present application further provide a housing, where the housing is formed by using the housing manufacturing method described above.

In a third aspect, an embodiment of the present application further provides a housing applied in an electronic device, where the housing includes an inner surface and an outer surface that are disposed opposite to each other, the housing includes a first side, a second side, a third side, and a fourth side that are connected end to end, the housing further includes an oxide film on the outer surface, the oxide film has a first color, a second color, and an additive color, and the additive color is formed by overlapping and superimposing the first color and the second color; the first color is located on the first edge, the first color gradually becomes lighter in the direction from the first edge to the third edge, the second color is located on the third edge, the second color gradually becomes lighter in the direction from the third edge to the first edge, and the superimposed color is located between the first edge and the third edge.

In a fourth aspect, an embodiment of the present application further provides an electronic device, which includes a housing, where the housing is the housing described above.

The shell manufacturing method provided by the embodiment of the application comprises the steps of firstly, providing a shell substrate, wherein the shell substrate comprises a first side, a second side, a third side and a fourth side which are connected end to end, carrying out oxidation treatment on the outer surface of the shell substrate, and forming an oxidation film on the outer surface of the shell substrate; sequentially performing dyeing treatment of a first color on the oxide film from the first edge to the third edge, wherein the dyeing time is sequentially reduced, so that a first color is formed on the oxide film, and the first color gradually becomes lighter from the first edge to the third edge; and sequentially dyeing the second color on the oxide film from the third edge to the first edge, wherein the dyeing time is sequentially reduced, the second color is formed on the oxide film, and the second color gradually becomes lighter from the third edge to the first edge, so that the first color close to the first edge, the second color close to the third edge and a superposed color between the first edge and the third edge are formed on the oxide film. The embodiment of the application can form two colors of gradually changed contrast colors on the outer surface of the shell through one-time oxidation and two-time dyeing, so that the requirements of users are not required to be met, and the process can be reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a housing according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 4 is a cross-sectional view in the direction a-a of fig. 3.

Fig. 5 is another cross-sectional view in the direction a-a of fig. 3.

Fig. 6 is another cross-sectional view in the direction a-a of fig. 3.

Fig. 7 is another cross-sectional view in the direction a-a of fig. 3.

Fig. 8 is another cross-sectional view in the direction a-a of fig. 3.

Fig. 9 is another cross-sectional view in the direction a-a of fig. 3.

Fig. 10 is another schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 11 is a cross-sectional view of fig. 10 in the direction B-B.

Fig. 12 is a schematic structural diagram of a back cover outer surface subjected to sand blasting according to an embodiment of the present application.

Fig. 13 is another schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 14 is a cross-sectional view in the direction of C-C of fig. 13.

Fig. 15 is another schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 16 is a cross-sectional view in the direction D-D of fig. 15.

Fig. 17 is a schematic structural diagram of a rear cover substrate according to an embodiment of the present application.

Fig. 18 is another schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 19 is another schematic structural diagram of the housing according to the embodiment of the present application.

Fig. 20 is another schematic structural diagram of a rear cover according to an embodiment of the present application.

Fig. 21 is another schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 22 is a schematic flow chart of a method for manufacturing a rear cover according to an embodiment of the present application.

Fig. 23 is a process diagram of a method for manufacturing a back cover according to an embodiment of the present disclosure.

Fig. 24 is a schematic flow chart of a painting process according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The embodiment of the application provides a shell manufacturing method, a shell substrate, a shell and electronic equipment. The details will be described below separately.

In the present embodiment, the method for manufacturing the rear cover will be described in terms of a method for manufacturing the rear cover, which may form a housing that may be provided in an electronic device, such as a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), and the like.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 1 comprises a housing 10, a display 20, a printed circuit board 30, and a battery 40.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a housing according to an embodiment of the present disclosure. Wherein, the casing 10 may include a cover plate 11, a middle frame 12 and a rear cover 13, the cover plate 11, the middle frame 12 and the rear cover 13 are combined with each other to form the casing 10, and the casing 10 has a closed space formed by the cover plate 11, the middle frame 12 and the rear cover 13 to accommodate the display screen 20, the printed circuit board 30, the battery 40 and the like. In some embodiments, the cover plate 11 is covered on the middle frame 12, the rear cover 13 is covered on the middle frame 12, the cover plate 11 and the rear cover 13 are located on opposite sides of the middle frame 12, the cover plate 11 and the rear cover 13 are oppositely arranged, and the closed space of the housing 10 is located between the cover plate 11 and the rear cover 13.

The cover plate 11 may be a transparent glass cover plate. In some embodiments, the cover plate 11 may be a glass cover plate made of a material such as sapphire. The middle frame 12 may be a metal casing, such as an aluminum alloy middle frame 12. It should be noted that the material of the frame 12 in the embodiment of the present application is not limited to this, and other manners may also be adopted, such as: the middle frame 12 can be a ceramic middle frame or a glass middle frame. For another example: the middle frame 12 may be a plastic middle frame. Also for example: the middle frame 12 may be a structure in which metal and plastic are matched with each other, and the plastic part may be formed by injection molding on a metal plate. Wherein the rear cover 13 may be a metal rear cover, such as an aluminum alloy rear cover.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a rear cover according to an embodiment of the present disclosure. The rear cover 13 may include an inner surface 131 and an outer surface 132 opposite to each other, the inner surface 131 of the rear cover 13 is close to the middle frame 12 and the cover plate 11 to form an inner surface of the housing 10, and the outer surface 132 of the rear cover 13 is far from the middle frame 12 and the cover plate 11 to form an outer surface of the housing 10. The rear cover 13 may further include an opening 133, and the opening 133 may be mounted with a camera.

In some embodiments, the rear cover 13 includes a first side 111, a second side 112, a third side 113, and a fourth side 114 that are connected end-to-end, wherein the first side 111 and the third side 113 are opposite, and the second side 112 and the fourth side 114 are opposite. In some embodiments, the second side 112 may be located at the bottom of the electronic device 1, the fourth side 114 may be located at the top of the electronic device 1, and the first side 111 and the third side 113 may be located at both sides of the electronic device 1. Wherein the opening 133 may be located at the fourth side 114.

Referring to fig. 4, fig. 4 is a cross-sectional view taken along a-a direction of fig. 3. The rear cover 13a may include a rear cover substrate 137, an oxide layer 134, and a paint layer 136.

The rear cover substrate 137 may be made of aluminum, such as aluminum alloy. The rear cover substrate 137 includes an inner surface 131 and an outer surface 132, the inner surface of the rear cover substrate 137 may be understood as an inner surface of the rear cover 13, and the outer surface of the rear cover substrate 137 may be understood as an outer surface before the rear cover is not oxidized, painted, or the like.

Wherein an oxide layer 134 is formed on the outer surface 132 of the back cover substrate 137. The oxide layer 134 may be formed by a single oxidation to form an oxide layer 134. Such as: the oxide layer 134 is formed by monochromatic oxidation, and may be formed by coloring after the oxidation process. It should be noted that in some embodiments, a multi-layer oxide layer may also be formed by two or more oxidations.

Such as: referring to fig. 5, fig. 5 is another cross-sectional view taken along a-a direction of fig. 3. Fig. 5 differs from fig. 4 in that: the oxide layer 134 of the back cover 13b includes two layers, i.e., a first oxide layer 1341 and a second oxide layer 1342. A first oxide layer 1341 is formed on the outer surface 132 of the back cover substrate 137 and a second oxide layer 1342 is formed on the first oxide layer 1341, which may cover only a portion of the first oxide layer in some embodiments. The first oxide layer 1341 and the second oxide layer 1342 may increase the bonding force with the paint layer 136. The multi-layer structure of the oxide layer is not illustrated here. In some embodiments, the first oxide layer may be a colored oxide layer, and the second oxide layer may also be a colored oxide layer. The color of the first oxide layer may be different from or the same as the color of the second oxide layer.

Wherein the paint layer 136 is formed on the oxide layer 134, and the oxide layer 134 is located between the paint layer 136 and the back cover substrate 137. In some embodiments, the paint layer 136 may be formed by spraying a layer of paint on the oxide layer 134. The paint layer 136 is located on the outermost layer of the outer surface of the rear cover 13, and the surface of the paint layer is smooth and flat, so that fingerprint is not easy to stick on the paint layer, and the outer surface of the rear cover can be kept clean and smooth.

It is noted that in some embodiments, two or more layers of paint may be sprayed on the oxide layer 134 to form two or more paint layers. Such as: referring to fig. 6, fig. 6 is another cross-sectional view taken along a-a direction of fig. 3. Fig. 6 differs from fig. 4 in that: the paint layers 136 of the rear cover 13c include a first paint layer 1361 and a second paint layer 1362. The first paint layer 1361 is formed on the oxide layer 134 and the second paint layer 1362 is formed on the first paint layer 1361. In some embodiments, the thickness of the second paint layer 1362 is greater than the thickness of the first paint layer 1361, and further, the thickness of the second paint layer 1362 is twice the thickness of the first paint layer 1361, such as the thickness of the second paint layer 1362 is 10um and the thickness of the first paint layer 1361 is 5 um. It should be noted that there may be some error value in the production process, such as an error value of 0.5um, for example, between the second paint layer 1362 and the first paint layer 1361. The setting of second paint layer and first paint layer thickness can provide better protection to the back lid surface, makes the bonding inseparabler moreover between the two-layer paint layer.

For another example: referring to fig. 7, fig. 7 is another cross-sectional view taken along a-a direction of fig. 3. Fig. 7 differs from fig. 4 in that: the paint layers 136 of the rear cover 13d include a first paint layer 1361, a second paint layer 1362 and a third paint layer 1363. The first paint layer 1361 is formed on the oxide layer 134, the second paint layer 1362 is formed on the first paint layer 1361, and the third paint layer 1363 is formed on the second paint layer 1362. Forming two or three paint layers on the oxide layer 134 may increase the bonding force between the oxide layer and the paint layer, and may provide better protection for the rear cover. In some embodiments, the thickness of the third paint layer 1363 is greater than the thickness of the second paint layer 1362, and the thickness of the second paint layer 1362 is greater than the thickness of the first paint layer 1361. Further, the thickness of the third paint layer 1363 is twice the thickness of the second paint layer 1362, the thickness of the second paint layer 1362 is twice the thickness of the first paint layer 1361, for example, the thickness of the third paint layer 1363 is 8um, the thickness of the second paint layer 1362 is 4um, and the thickness of the first paint layer 1361 is 2 um.

In some embodiments, the thicknesses of the third paint layer 1363, the second paint layer 1362, and the first paint layer 1361 are sequentially reduced by equal thickness, such as the thickness of the third paint layer 1363 is 9um, the thickness of the second paint layer 1362 is 6um, and the thickness of the first paint layer 1361 is 3 um. The setting of third paint layer, second paint layer and first paint layer thickness can provide better protection to the back lid surface, makes bonding more inseparabler between the three-layer paint layer moreover.

In some embodiments, the paint layer may be provided transparently. It should be noted that when the paint layers are at least two layers, at least one of the paint layers may be disposed to be transparent. Further, all paint layers are arranged in a transparent mode. The back cover oxide layer is the color of the outer surface of the back cover.

To increase the bonding force between the paint layer 136 and the oxide layer 134, in some embodiments, please refer to fig. 8, which is another cross-sectional view of fig. 3 along the direction a-a. Fig. 8 differs from fig. 4 in that: the rear cover 13e may further include a bonding layer 135. The bonding layer 135 is formed on the oxide layer 134, and the paint layer 136 is formed on the bonding layer 135. In some embodiments, the bonding layer 135 may be formed on the oxide layer 134 by PVD (Physical Vapor Deposition). The bonding layer 135 is positioned between the oxide layer 134 and the paint layer 136, and may increase the bonding force between the oxide layer 134 and the paint layer 136. It should be noted that, in the embodiments of the present application, the bonding layer may also be formed on the oxide layer in other manners to increase the bonding force between the oxide layer and the paint layer.

In some embodiments, referring to fig. 9, fig. 9 is another cross-sectional view taken along a-a direction of fig. 3, where fig. 9 differs from fig. 4 in that: back lid 13f back lid base plate 137's surface forms sandblast layer 1371 that has the concave-convex structure, and the concave-convex structure on this sandblast layer 1371 can adopt the mode of sandblast to form through the sandblast machine for back lid base plate 137 surface is clean, coarse, and then can increase the cohesion that forms between oxide layer 134 and the paint layer 136 on this sandblast layer 1371. In some embodiments, the sandblasted layer 1371 covers the entire outer surface of the back cover substrate 137. Note that the blasting layer 1371 may have a convex structure or a concave structure.

In some embodiments, please refer to fig. 10, and fig. 10 is a schematic structural diagram of a rear cover according to an embodiment of the present disclosure. The outer surface of the rear cover 13g includes two pre-blasting regions 115, and the two pre-blasting regions 115 are spaced apart from each other. Specifically, two pre-sandblasting areas 115 are respectively adjacent to the first side 111 and the third side 113. Namely, a pre-blasting area 115 is disposed adjacent to the first edge 111, or a pre-blasting area 115 is disposed adjacent to the first edge 111; another pre-sandblasting area 115 is located adjacent to the third edge 113, or one pre-sandblasting area 115 is located adjacent to the third edge 113.

In some embodiments, the pre-blasting region 115 may be treated by blasting with a blasting machine to form the concave-convex structure in the pre-blasting region 115. Specifically, referring to fig. 11, fig. 11 is a cross-sectional view taken along the direction B-B in fig. 10. A sandblasted layer 1373 having a concave-convex structure is formed in the pre-sandblasted region 115, and the sandblasted layer 1373 has two portions, i.e., a first sandblasted layer 1371 and a second sandblasted layer 1372. Wherein the first sandblasting layer 1371 is formed on one of the pre-sandblasting areas 115, and the first sandblasting layer 1371 is adjacent to the first side 111. Wherein the second blasting layer 1372 is formed on the other pre-blasting region 115, the second blasting layer 1372 being adjacent to the third side 113. The first blasting layer 1371 and the second blasting layer 1372 are spaced apart from each other. It should be noted that the sandblasting layer 1373 may also have a protruding structure or a recessed structure.

In some embodiments, please refer to fig. 12, fig. 12 is a schematic structural view illustrating a sandblasting process performed on an outer surface of a rear cover according to an embodiment of the present disclosure. The distance between the second side 112 and the fourth side 114 is H1, the sandblasting layer 1373 is close to the second side 112, and the height of the sandblasting layer 1373 in the direction from the second side 112 to the fourth side 113 is H2, wherein 2/5H1 < H2 < 4/5H 1. It should be noted that in some other embodiments, the height of the sandblasting layer 1373 can be set according to actual requirements.

The width of the sandblasting layer 1373 in the direction from the first side 111 to the third side 113 is W, wherein W is more than 1cm and less than 2 cm. It should be noted that the width of the sandblasting layer 1373 can be set according to actual requirements.

In some embodiments, the blasting layer 1373 may be an arc-shaped structure, and a bending direction of the arc-shaped structure may be a direction from the first side 111 to the third side 113.

It should be noted that, in the process of holding the electronic device 1, the area where the user holds the electronic device 1 for a long time is the outer surface of the housing of the electronic device 1, specifically, the user holds the electronic device 1 to the two side edges of the rear cover of the housing. More specifically, the width of the outer surface of the back cover in the width direction is 1-2cm, and the width of the fingers is 1-2 cm. In addition, the height duration for the user to hold the electronic apparatus 1 with the hand is more than half of the height of the electronic apparatus 1. Therefore, according to the habit of holding the electronic device 1 by a user, the region and the like, the sandblasting treatment is performed at the two side edge positions of the rear cover, and a sandblasting layer with a concave-convex structure can be formed, so that the friction force can be increased, and the anti-skid effect can be increased.

It should be noted that the pre-blasting area 115 according to the embodiment of the present application is not limited thereto, and may be one. Specifically, referring to fig. 13 and 14, fig. 13 is another structural schematic view of a rear cover according to an embodiment of the present application, and fig. 14 is a cross-sectional view of fig. 13 in a direction C-C. The differences between fig. 13 and 14 and fig. 10 and 11 are that: the pre-blasting area 115 is one, and the pre-blasting area 115 is close to the first edge 111, or the pre-blasting area 115 is adjacent to the first edge 111.

It should be noted that, when there is one pre-blasting region 115, one pre-blasting region 115 may be disposed near the third side 113.

It should be noted that the paint layer may be formed on the entire outer surface of the rear cover, or may be formed on the sandblast layer. When the paint layer is formed on the blasting layer, the paint layer may overlap the blasting layer. When the paint layers are two or more, one of the paint layers may be disposed on the sandblasted layer, or one or more of the paint layers may be disposed on the entire outer surface of the rear cover.

In some embodiments, please refer to fig. 15, and fig. 15 is another structural schematic diagram of the rear cover according to the embodiment of the present application. The rear cover 13i includes a first oxide film 1343 and a second oxide film 1344. Note that the first oxide film 1343 can refer to the first oxide layer 1341 described above. Specifically, referring to fig. 16, fig. 16 is a cross-sectional view taken along the direction D-D in fig. 15. The second oxide film 1344 and the first oxide film 1343 are arranged side by side on the outer surface of the rear cover 13 i. The thickness of the second oxide film 1344 is greater than the thickness of the first oxide film 1343, and the outer surface of the second oxide film 1344 and the outer surface of the first oxide film 1343 are on the same surface.

Referring to fig. 17, fig. 17 is a schematic structural diagram of a rear cover substrate according to an embodiment of the present disclosure. The back cover substrate 137 includes a first oxide film 1343 and a predetermined pattern 1375 formed by laser etching at an outer surface 132 thereof, and the predetermined pattern 1375 is formed by laser etching.

In some embodiments, the distance from the predetermined pattern 1375 to the outer surface of the first oxide film 1343 is greater than the thickness of the first oxide film 1343.

It should be noted that the structure of the rear cover is not limited to this, for example: the rear cover may include two or more oxide layers, two or more paint layers. For another example: the rear cover may include two or more oxide layers, two or more paint layers, and an anchor layer. For another example: the rear cover may include two or more oxide layers, two or more paint layers, and a sandblast layer. It should be noted that the number of layers of the oxide layer, the sandblasting layer, the bonding layer and the paint layer is within the protection scope of the embodiments of the present application, and will not be illustrated herein.

In some embodiments, please refer to fig. 18, and fig. 18 is another structural schematic diagram of the rear cover according to the embodiment of the present application. The rear cover 13j includes a first side 111, a second side 112, a third side 113 and a fourth side 114 connected end to end, which can be referred to above. The rear cover 13j includes an inner surface and an outer surface, as can be seen in detail above. The rear cover 13j includes an opening 133, as can be seen in detail above. The back cover 13j includes an oxide film 134j, which can be referred to the above oxide layer 134, and is not described herein again. In some embodiments, the back cover 13j forms a first color 1345, a second color 1346, and an overlay color 1347 on the oxide film 134 j.

The first color 1345 is located on the fourth side 114, and the first color 1345 gradually becomes lighter from the fourth side 114 to the second side 112.

The second color 1346 is located on the second side 112, and the second color 1346 gradually becomes lighter from the second side 112 to the fourth side 114.

The superimposed color 1347 is formed by overlapping and superimposing a first color 1345 and a second color 1346; an overlay color 1347 is located between fourth edge 114 and second edge 112. Therefore, the color on the surface of the rear cover 13j presents a gradual change color collision effect, the color transition is uniform, all colors are on the same oxidation film plane, no boundary line exists between the colors, no step is generated, and the hand feeling and appearance integrity of the product are ensured; in addition, the scheme does not need operation processes such as ink shielding, oxide film removing and the like, and compared with the existing oxidation dyeing scheme, the process can be reduced, and the cost is reduced. The gradual change refers to a color that changes from light to dark, or from dark to light, or from one color to another color. The contrast color refers to the matching of contrast colors, including intense color matching or complementary color matching.

In some embodiments, the first color 1345 may be blue, the second color 1346 may be red, and the superimposed color 1347 is purple. Note that the colors of the first color 1345, the second color 1346, and the superimposed color 1347 in the embodiment of the present application are not limited to these colors. It should be further noted that the gradient impact color is not limited to the two-color impact gradient, and the embodiment of the present application may also be applied to multiple colors.

The area of the oxide film 134j having the first color 1345 is the same as the area having the second color 1346. Further, the portion of the oxide film 134j having the first color 1345 and the portion having the second color 1346 are axisymmetric with respect to the portion having the superimposed color 1347.

For example, please refer to fig. 19, and fig. 19 is another schematic structural diagram of the housing according to the embodiment of the present application. Among them, a case 10a shown in fig. 19 includes a cover plate 16 and a rear cover 17. In some embodiments, the cover plate 16 is directly covered on the rear cover 17, the cover plate 16 and the rear cover 17 are combined with each other to form the housing 10a, and the housing 10a has a closed space formed by the cover plate 16 and the rear cover 17 to accommodate the display 20, the printed circuit board 30, the battery 40, and the like. Compared with the housing 10 shown in fig. 2, the housing 10a does not include the middle frame, or the middle frame 12 and the rear cover 13 in fig. 2 are integrally formed to form a rear cover 17 structure (of course, the middle frame structure may be named herein). Specifically, please refer to fig. 20, fig. 20 is another schematic structural diagram of the rear cover according to the embodiment of the present application. In some embodiments, the rear cover 17 includes an inner surface 171 and an outer surface 172, with the inner surface 171 and the outer surface 172 being oppositely disposed to form the entire surface of the rear cover 17. The various layers of the rear cover 17 can be referred to as the rear cover 13, and are not described in detail here.

The printed circuit board 30 is installed in the housing 10, the printed circuit board 30 may be a main board of the electronic device 1, and functional components such as an antenna, a motor, a microphone, a camera, a light sensor, a receiver, and a processor may be integrated on the printed circuit board 30. In some embodiments, the printed circuit board 30 is secured within the housing 10. Specifically, the printed circuit board 30 may be screwed to the middle frame 12 by screws, or may be snapped to the middle frame 12 by a snap-fit manner. It should be noted that the way of fixing the printed circuit board 30 to the middle frame 12 is not limited to this, and other ways, such as a way of fixing by a snap and a screw, may also be used.

Wherein the battery 40 is mounted in the housing 10, and the battery 40 is electrically connected to the printed circuit board 30 to supply power to the electronic device 1. The case 10 may serve as a battery cover of the battery 40. The case 10 covers the battery 40 to protect the battery 40, and particularly, the rear cover 13 covers the battery 40 to protect the battery 40, reducing damage to the battery 40 due to a collision, a fall, or the like of the electronic apparatus 1.

Wherein the display screen 20 is installed in the housing 10, and at the same time, the display screen 20 is electrically connected to the printed circuit board 30 to form a display surface of the electronic device 1. The display screen 20 includes a display area 14 and a non-display area 15. The display area 14 may be used to display a screen of the electronic device 1 or provide a user with touch control. The top area of the non-display area 15 is provided with an opening for transmitting sound and light, and the bottom of the non-display area 15 can be provided with functional components such as a fingerprint module, a touch key and the like. The cover plate 11 is mounted on the display screen 20 to cover the display screen 20, and forms the same display area and non-display area as the display screen 20, which can be referred to specifically as the display area and the non-display area of the display screen 20.

The structure of the display screen 21 is not limited to this. For example, the display screen may be a full-screen or an opposite-type screen, specifically, please refer to fig. 21, and fig. 21 is another schematic structural diagram of the electronic device according to the embodiment of the present application. The electronic device in fig. 21 differs from the electronic device in fig. 1 in that: the non-display area 15a is directly formed on the display screen 20a, for example, the non-display area 15a of the display screen 20a is provided with a transparent structure so that an optical signal can pass through, or the non-display area of the display screen 20a is directly provided with an opening or a notch for light conduction, and the like, and a front camera, a photoelectric sensor, and the like can be arranged at the position of the non-display area so that the front camera can take a picture and the photoelectric sensor can detect. The display area 14a is spread over the entire surface of the electronic apparatus 1 a. It should be noted that the components of the housing 10, the printed circuit board 30, the battery 40, and the like in the electronic device 1a can refer to the above contents, and are not described herein again.

It should be noted that the display screen may also be displayed in full screen without setting the non-display area.

In order to further describe the housing structure of the embodiments of the present application, a housing manufacturing method is taken as an example and described in detail below. The manufacturing method of the housing may specifically include a rear cover manufacturing method and a middle frame manufacturing method. The following description will be made by taking a method for manufacturing a case and a method for manufacturing a rear cover as an example, and it is to be understood that the method for manufacturing a case in the embodiment of the present application is not limited to the rear cover.

Referring to fig. 22 and 23 together, fig. 22 is a schematic flow chart of a method for fabricating a back cover according to an embodiment of the present disclosure, and fig. 23 is a process diagram of the method for fabricating a back cover according to the embodiment of the present disclosure. The manufacturing method of the rear cover comprises the following steps:

in step 101, a back cover substrate 137 is provided. The rear cover substrate 137 may be a metal material, such as an aluminum material, and further, such as an aluminum alloy. The rear cover substrate 137 may be obtained as it is, or may be obtained by processing a plate material, for example, by performing a process such as forging or aging on an aluminum alloy plate material.

The back cover substrate 137 may include an inner surface and an outer surface that are oppositely disposed, and the back cover substrate 137 and the inner surface and the outer surface thereof may refer to the above contents, which are not described herein again. The rear cover substrate 137 may further include a first side 111, a second side 112, a third side 113, and a fourth side 114 that are connected end to end, which may be referred to above specifically, and are not described herein again. The rear cover substrate 137 includes an opening 133, which can be referred to above and will not be described herein.

In step 102, the outer surface of the rear cover substrate 137 is subjected to oxidation treatment, and an oxide film 134j is formed on the outer surface of the rear cover substrate 137.

Specifically, the back cover substrate 137 is anodized to form the oxide film 134 j.

In some embodiments, before the oxidation treatment is performed on the outer surface of the rear cover substrate 137, the outer surface of the rear cover substrate 137 may be ground and polished, and then the first oxidation treatment is performed on the outer surface of the rear cover substrate 137 after the grinding and polishing treatment, so that the polishing treatment effect is better, and the surface of the rear cover substrate 137 is smoother.

Specifically, the grinding process may be understood as a rough process before the polishing process. That is, the outer surface of the rear cover substrate 137 may be subjected to rough polishing once and then to fine polishing once, thereby completing the polishing process. So that the outer surface of the back cover substrate is flat.

In some embodiments, the outer surface of the back cover substrate 137 may be polished mechanically, chemically, electrochemically, ultrasonically, or the like. So that the surface roughness of the rear cover substrate 137 is reduced to obtain a bright, flat surface of the outer surface of the rear cover substrate 137. The chemical polishing process is to regularly dissolve the outer surface of the rear cover substrate 137 to be smooth and flat. The electrochemical polishing method is to immerse the outer surface of the back cover substrate 137 as an anode and the insoluble metal as a cathode into an electrolytic bath simultaneously, and generate a selective anode solution by direct current, so that the brightness of the outer surface of the back cover substrate 137 is increased. The mechanical polishing is performed by cutting the outer surface of the rear cover substrate 137, and plastically deforming the outer surface of the rear cover substrate 137 to remove the polished convex portion, thereby obtaining a smooth surface. The ultrasonic polishing is carried out by putting the rear cover substrate 137 into an abrasive suspension and putting the suspension and the ultrasonic field together, and grinding and polishing the abrasive on the surface of the workpiece by means of the oscillation action of ultrasonic waves.

In step 103, the oxide film 134j is sequentially dyed with the first color 1345 in a direction from the fourth edge 114 to the second edge 112, and the dyeing time is sequentially reduced, so that the first color 1345 is formed on the oxide film 134j, and the first color 1345 gradually becomes lighter in a direction from the fourth edge 114 to the second edge 112.

Specifically, the rear cover substrate 137 is placed in a first staining solution having the first color 1345 in a direction from the fourth edge 114 to the second edge 112, and gradually immersed in the first staining solution, thereby staining the oxide film 134 j. The speed of immersing the rear cover substrate 137 into the first staining solution gradually increases, and/or the speed of taking out the rear cover substrate 137 from the first staining solution gradually decreases.

In some embodiments, the anodized aluminum alloy rear cover substrate 137 may be gradually dipped from the fourth side 114 to the second side 112 into a first color staining bath having a first color staining solution upside down by using a lifting device. And the total height of the falling is divided into a plurality of sections, the fourth edge 114 of the rear cover substrate 137 at the initial position is flush with the liquid level in the dyeing tank, the rear cover substrate 137 is gradually immersed into the tank for dyeing, the descending height of each section is set, the descending speed is slow first and then fast, different parts of the rear cover substrate 137 have different dyeing time, the color of the part close to the fourth edge 114 is darker, and the color of the part close to the second edge 112 is gradually lighter due to short dyeing time, so that the gradual change effect is presented. For gradual change, the above contents may be referred to, and are not described herein again.

In step 104, the oxide film 134j is sequentially dyed with the second color 1346 in a direction from the second side 112 to the fourth side 114, and the dyeing time is sequentially reduced, so that the second color 1346 is formed on the oxide film 134j, and the second color 1346 gradually becomes lighter in a direction from the second side 112 to the fourth side 114, so that the oxide film 134j forms the first color 1345 near the fourth side 114, the second color 1346 near the second side 112, and the superimposed color 1347 between the fourth side 114 and the second side 112.

Specifically, the rear cover substrate 137 is placed in a second staining solution having a second color 1346 in a direction from the second side 112 to the fourth side 114, and gradually immersed in the second staining solution, thereby staining the oxide film 134 j. The speed of immersing the rear cover substrate 137 into the second staining solution gradually increases, and/or the speed of taking out the rear cover substrate 137 from the second staining solution gradually decreases.

In some embodiments, the product dyed with the first color and the gradated color can be taken out of the dyeing tank by using a lifting device, put into an oven for baking for 5 minutes, turned over again, and gradually descended and immersed into a second color dyeing tank, and the first color dyeing process can be specifically performed. Due to the difference in dyeing time, the color of the portion near the second side 112 is darker and gradually becomes lighter from the second side 112 to the fourth side 114. According to the hue superposition principle, the hue of the first color is shown near the fourth edge 114, the hue of the second color is shown near the second edge 112, and the middle color of the two hues, i.e., the superposition color, is shown in the whole color-changing impact effect of the two hues. The collision color can be referred to above, and is not described herein.

In some embodiments, the first color 1345 may be blue, the second color 1346 may be red, and the superimposed color 1347 is purple. Note that the colors of the first color 1345, the second color 1346, and the superimposed color 1347 in the embodiment of the present application are not limited to these colors. It should be further noted that the gradient impact color is not limited to the two-color impact gradient, and the embodiment of the present application may also be applied to multiple colors. It should be noted that, in the dyeing process, not only the direction from the fourth edge to the second edge first, but also the direction from the second edge to the fourth edge; or the direction from the second side to the fourth side and then the direction from the fourth side to the second side; the direction from the first edge to the third edge can be firstly carried out, and then the direction from the third edge to the first edge can be carried out; the direction from the third edge to the first edge can be first, and then the direction from the first edge to the third edge can be further carried out. It is to be understood that the dyeing direction is not limited thereto, and may be from one corner to an opposite corner position.

As can be seen from the above, in the embodiment of the present application, a first color 1345, a second color 1346, and a superimposed color 1347 formed by superimposing the first color 1345 and the second color 1346 on each other can be formed on the oxide film 134j by performing the dyeing process with one anodization, two different directions, different positions, and different time controls. Therefore, the color on the surface of the rear cover 13j presents a gradual change color collision effect, the color transition is uniform, all colors are on the same oxide film 134j plane, no boundary line exists between the colors, no step is generated, and the hand feeling and appearance integrity of the product are ensured; in addition, the scheme does not need operation processes such as ink shielding, oxide film removing and the like, and compared with the existing oxidation dyeing scheme, the process can be reduced, and the cost is reduced. The gradual change refers to a color that changes from light to dark, or from dark to light, or from one color to another color. The contrast color refers to the matching of contrast colors, including intense color matching or complementary color matching.

In some embodiments, the outer surface of the dyed rear cover substrate may be subjected to at least one painting process to form at least one paint layer on the oxide film 134 j. The at least one paint layer is positioned on the outermost layer of the outer surface of the rear cover, the surface of the paint layer is smooth and flat, fingerprints are not easy to stick, and the outer surface of the rear cover can be kept clean and smooth.

In some embodiments, a single painting process may be performed on the oxide film to form a single paint layer, or two or more painting processes may be performed on the oxide film to form two or more paint layers. The oxide film may be directly subjected to a single painting process to form a single paint layer, or the oxide film may be subjected to two or more painting processes to form two or more paint layers.

In some embodiments, after the painting process is performed at least once on the outer surface of the back cover after the dyeing process, the outer surface of the back cover may be baked at least once, and a high temperature baking may be used to dry the paint sprayed on the outer surface of the back cover to form a paint layer. For example, the baking temperature is 80 ℃ and the baking time is 1 hour, and the outer surface of the rear cover is baked. It should be noted that, after each paint spraying treatment, a baking treatment may be performed. Referring to fig. 24, fig. 24 is a schematic flow chart of the painting process according to an embodiment of the present application. The process of the paint spraying treatment comprises the following steps:

in step 1051, a first painting process is performed on the outer surface of the dyed rear cover. In particular to spraying a layer of transparent paint.

In some embodiments, the first painting process may be performed on the entire outer surface of the rear cover, that is, the first painting process may be performed on the entire outer surface of the rear cover.

In step 1052, a first baking process is performed on the outer surface of the rear cover after the first paint spraying process, so as to form a first paint layer on the outer surface of the rear cover. The first painting process and the baking process may increase the bonding force of the oxide film and the first paint.

In some embodiments, the first paint layer may cover the entire outer surface of the rear cover. In other embodiments, the first paint layer may cover a portion of the outer surface of the rear cover.

In step 1053, a second painting process is performed on the outer surface of the rear cover after the first baking process. And performing secondary paint spraying treatment on the outer surface of the rear cover after the primary baking treatment, and spraying transparent paint.

In some embodiments, the second painting process may be performed on the entire outer surface of the rear cover, or may be performed on a partial region of the outer surface of the rear cover.

It should be noted that, in the first painting process and the second painting process, at least one painting process is performed to cover the entire outer surface of the rear cover.

In step 1054, a second baking process is performed on the outer surface of the rear cover after the second painting process, and a second paint layer is formed on the outer surface of the rear cover.

Wherein the second paint layer may be formed on the first paint layer. The second paint layer may also be formed on the oxide layer and the first paint layer. In some embodiments, at least one of the first and second paint layers covers the entire outer surface of the rear cover.

In some embodiments, the first and second paint layers are both formed of clear paint. It should be noted that one of the first and second paint layers may be a transparent paint layer.

It should be noted that three paint spraying treatments and three baking treatments may also be performed, and are not described herein again. The thickness relationship among the paint layers can be referred to above, and is not described herein again. Further, the painting treatment and the baking treatment may be performed three or more times.

In some embodiments, the outer surface of the dyed rear cover may be subjected to a physical vapor deposition process prior to the painting process to form a bonding layer on the outer surface of the rear cover. And then carrying out paint spraying treatment on the outer surface of the rear cover after physical vapor deposition treatment.

Specifically, after the dyeing process, in order to increase the bonding force between the paint layer and the oxide film, a bonding layer may be formed on the oxide film by physical vapor deposition, and then a paint spraying process may be performed on the bonding layer to form the paint layer on the bonding layer. The bonding layer can increase the bonding force of the oxide film and the paint layer, and the protective effect on the outer surface of the rear cover is better.

To sum up, the method for manufacturing the rear cover provided by the embodiment of the application can sequentially form the oxidation film and the at least one paint layer on the outer surface of the rear cover, the paint layer is formed on the outermost layer of the outer surface of the rear cover, the surface of the paint layer is high and transparent, so that the surface of the paint layer is smooth and flat and is not easy to stick fingerprints, and the outer surface of the rear cover can be kept clean.

Those skilled in the art will appreciate that the structure of the electronic device 1 shown in fig. 1 does not constitute a limitation of the electronic device 1. The electronic device 1 may comprise more or fewer components than shown, or some components may be combined, or a different arrangement of components. The electronic device 1 may further include a memory, a bluetooth module, etc., which will not be described herein.

The above detailed descriptions of the method for manufacturing the housing, the housing substrate, the housing, and the electronic device provided in the embodiments of the present application are provided, and specific examples are applied herein to explain the principles and embodiments of the present application, and the descriptions of the above embodiments are only used to help understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A shell manufacturing method is applied to electronic equipment, and is characterized by comprising the following steps:

sequentially performing dyeing treatment of a first color on the oxide film from the fourth edge to the second edge, wherein the dyeing time is sequentially reduced, so that a first color is formed on the oxide film, and the first color gradually becomes lighter from the fourth edge to the second edge;

sequentially dyeing the oxide film with a second color from the second edge to the fourth edge, wherein the dyeing time is sequentially reduced, the second color is formed on the oxide film, and the second color gradually becomes lighter from the second edge to the fourth edge, so that the first color close to the fourth edge, the second color close to the second edge and a superimposed color between the fourth edge and the second edge are formed on the oxide film;

performing paint spraying treatment on the outer surface of the oxidized shell for at least three times, and forming at least three paint layers on the outer surface of the shell, wherein the three paint layers comprise a first paint layer, a second paint layer and a third paint layer, the first paint layer is formed on the oxide film, the second paint layer is formed on the first paint layer, and the third paint layer is formed on the second paint layer;

the thicknesses of the third paint layer, the second paint layer and the first paint layer are sequentially decreased in an equal thickness mode; or

The thickness of the third paint layer is twice the thickness of the second paint layer, which is twice the thickness of the first paint layer, to prevent fingerprint sticking on the outer surface of the housing.

2. The method of manufacturing a case according to claim 1, wherein the step of sequentially performing a first color dyeing process on the oxide film from the fourth edge to the second edge, and sequentially decreasing the dyeing time, to form a first color on the oxide film, the first color gradually becoming lighter in a direction from the fourth edge to the second edge, includes:

and placing the shell substrate into a first dyeing solution with the first color from the fourth edge to the second edge, and gradually immersing the shell substrate into the first dyeing solution to dye the oxide film.

3. The method for manufacturing a housing according to claim 2, wherein the step of dyeing the oxide film by placing the housing substrate in a first dyeing solution having the first color and gradually immersing the housing substrate in the first dyeing solution from the fourth edge to the second edge comprises:

the speed of the shell substrate gradually immersed into the first dyeing liquid gradually becomes faster.

4. The method for manufacturing a case according to claim 2 or 3, wherein the step of dyeing the oxide film by placing the case substrate in a first dyeing solution having the first color and gradually immersing the case substrate in the first dyeing solution from the fourth edge to the second edge comprises:

the speed of taking out the housing substrate from the first staining solution gradually decreases.

5. The method for manufacturing a case according to claim 2, wherein the step of sequentially performing a second color dyeing process on the oxide film from the second side to the fourth side and sequentially decreasing the dyeing time to form a second color on the oxide film, the second color gradually becoming lighter in a direction from the second side to the fourth side so that the first color near the fourth side, the second color near the second side, and a superimposed color between the fourth side and the second side are formed on the oxide film, comprises:

the housing substrate is placed in a second staining solution having the second color and gradually immersed in the second staining solution from the second side to the fourth side, and the oxide film is stained.

6. The method for manufacturing a case according to claim 5, wherein the step of dyeing the oxide film by placing the case substrate in a second dyeing solution having the second color and gradually immersing the case substrate in the second dyeing solution from the second side to the fourth side comprises:

the speed of the shell substrate gradually immersed into the second dyeing liquid gradually becomes faster.

7. The method for manufacturing a case according to claim 5 or 6, wherein the step of dyeing the oxide film by placing the case substrate in a second dyeing solution having the second color and gradually immersing the case substrate in the second dyeing solution from the second side to the fourth side includes:

the speed of taking out the housing substrate from the second staining solution gradually becomes slower.

8. The method of manufacturing a case according to claim 1, wherein the step of dyeing the oxide film with a first color is performed in a direction from the fourth edge to the second edge, and the dyeing time is reduced in a sequence, so that a first color is formed on the oxide film, and the first color is gradually reduced in a direction from the fourth edge to the second edge, and the method further comprises:

and carrying out baking treatment on the shell substrate with the first color.

9. The method of claim 8, wherein the baking time is five minutes.

10. The method of claim 1, wherein the housing substrate further comprises an opening proximate the first edge.

11. The method of manufacturing a case according to claim 1, wherein the step of forming an oxide film on the outer surface of the case substrate by oxidizing the outer surface of the case substrate includes:

and carrying out anodic oxidation treatment on the outer surface of the shell substrate to form an oxide film on the outer surface of the shell substrate.

12. The method of making a housing of claim 1, wherein the first color is blue, the second color is red, and the superimposed color is purple.

13. The method for manufacturing a case according to claim 1, wherein the step of performing at least three paint spraying processes on the outer surface of the case after the oxidation process comprises:

performing primary paint spraying treatment on the outer surface of the shell after the oxidation treatment;

carrying out primary baking treatment on the outer surface of the shell after the primary paint spraying treatment to form a first paint layer on the outer surface of the shell, wherein the first paint layer is formed on the oxide film;

carrying out secondary paint spraying treatment on the outer surface of the shell subjected to the primary baking treatment;

carrying out second baking treatment on the outer surface of the shell subjected to the second paint spraying treatment to form a second paint layer on the outer surface of the shell, wherein the second paint layer is formed on the first paint layer;

carrying out third paint spraying treatment on the outer surface of the shell subjected to the second baking treatment;

and carrying out third baking treatment on the outer surface of the shell subjected to the third paint spraying treatment to form a third paint layer on the outer surface of the shell.

14. The method of claim 1 wherein at least one of the first, second and third paint layers is a transparent paint layer.

15. The method of claim 1 wherein the thickness of the third paint layer is 8um, the thickness of the second paint layer is 4um, and the thickness of the first paint layer is 2 um.

16. The method of claim 1, wherein the thickness of the third paint layer is 9um, the thickness of the second paint layer is 6um, and the thickness of the first paint layer is 3 um.

17. A shell applied to electronic equipment is characterized in that the shell comprises an inner surface and an outer surface which are oppositely arranged, the shell comprises a first edge, a second edge, a third edge and a fourth edge which are connected end to end, the shell further comprises an oxide film and at least three paint layers, the oxide film is located on the outer surface, the oxide film has a first color, a second color and an overlapped color, and the overlapped color is formed by overlapping and superposing the first color and the second color; the first color is located on the fourth side, the first color gradually becomes lighter in the direction from the fourth side to the second side, the second color is located on the second side, the second color gradually becomes lighter in the direction from the second side to the fourth side, and the superimposed color is located between the fourth side and the second side;

the oxide film is formed on the outer surface of the housing, and the at least three paint layers include a first paint layer formed on the oxide film, a second paint layer formed on the first paint layer, and a third paint layer formed on the second paint layer;

18. The housing of claim 17, wherein the oxide film has the same area of the first color as the area of the second color.

19. The housing according to claim 18, wherein the oxide film has a portion of the first color and a portion of the second color that are axisymmetric with respect to the portion of the superimposed color.

20. The housing of claim 17, further comprising an aperture proximate the first edge.

21. The housing of claim 17, wherein the first color is blue, the second color is red, and the superimposed color is purple.

22. The housing according to any one of claims 17 to 21, wherein at least one of the first, second and third paint layers is provided transparent.

23. The housing according to any of the claims 17 to 21, characterized in that the thickness of the third paint layer is 8um, the thickness of the second paint layer is 4um and the thickness of the first paint layer is 2 um.

24. The housing according to any of the claims 17 to 21, characterized in that the thickness of the third paint layer is 9um, the thickness of the second paint layer is 6um and the thickness of the first paint layer is 3 um.

25. An electronic device, comprising a housing according to any one of claims 17 to 24.