Housing, coating mechanism, manufacturing method for housing, and electronic device

Abstract

Disclosed is an electronic device. The electronic device comprises a housing. The housing comprises a substrate and a coating, the coating is arranged on the surface of the substrate, and the thickness difference of the coating between any two adjacent side surfaces of the substrate is smaller than or equal to a preset threshold. Also disclosed are a coating mechanism and a manufacturing method for the housing.

Description

Shell, coating mechanism, shell manufacturing method and electronic device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202410710695.6, filed on May 31, 2024, entitled "A shell, coating mechanism, shell manufacturing method and electronic device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of coating technology, in particular to a shell, coating mechanism, shell manufacturing method and electronic device. BACKGROUND

[0004] The surface of the shell of the electronic device is provided with a film layer, and the film layer is widely used in changing the performance of the shell of the electronic device. However, in the electronic device shell provided by the related technology, the thickness uniformity of the film layer of the shell of the electronic device is poor, and the problem of color difference is prone to occur.

[0005] DISCLOSURE

[0006] The purpose of the present application is to provide a coating mechanism, a shell, a shell manufacturing method and an electronic device. In the shell provided in the embodiments of the present application, the difference between the thicknesses of the coatings on different side surfaces of the substrate is small, and the uniformity of the thickness of the coating of the substrate is good.

[0007] The first aspect of the present application provides a shell, comprising a substrate; and a coating, the coating is arranged on the surface of the substrate, and the difference between the thicknesses of the coating on any two adjacent side surfaces of the substrate is less than or equal to a preset threshold value.

[0008] In some embodiments, the preset threshold value is less than or equal to 50 nm.

[0009] In some embodiments, the color difference of the coating on any two adjacent side surfaces of the substrate satisfies: ΔL < 5, Δa < 3, Δb < 3.

[0010] In some embodiments, the coating comprises a primer layer, an intermediate coating layer and a surface coating layer arranged in sequence, and the primer layer is arranged between the substrate and the intermediate coating layer.

[0011] In some embodiments, the surface coating layer contains at least one of nitrogen silicon chromium, titanium nitride, chromium nitride, tungsten carbide and carbon nitrogen silicon chromium, and the thickness of the surface coating layer is between 200 nm ± 20 nm.

[0012] In some embodiments, the surface coating layer further contains vanadium element.

[0013] In some embodiments, the intermediate plating layer comprises at least one of chromium nitride and chromium silicon nitride.

[0014] In some embodiments, the intermediate plating layer comprises a first plating layer and a second plating layer arranged in a stack; at least one of the first plating layer and the second plating layer comprises vanadium element; the first plating layer has a thickness of 200 nm ± 20 nm, and the second plating layer has a thickness of 200 nm ± 20 nm.

[0015] In some embodiments, the intermediate plating layer comprises a plurality of first plating layers and a plurality of second plating layers arranged in a stack alternately; at least one of the plurality of first plating layers and the plurality of second plating layers comprises vanadium element; the first plating layer has a thickness of 200 nm ± 20 nm, and the second plating layer has a thickness of 200 nm ± 20 nm.

[0016] In some embodiments, among the plurality of first plating layers, one of the first plating layers is arranged between the base layer and the second plating layer, and another of the first plating layers is arranged between the surface plating layer and the second plating layer.

[0017] In some embodiments, the first plating layer comprises chromium nitride, and the second plating layer comprises chromium silicon nitride.

[0018] In some embodiments, the base layer comprises chromium element, and the base layer has a thickness of 300 nm ± 30 nm.

[0019] In some embodiments, the substrate is made of metal.

[0020] In some embodiments, the substrate and the coating layer further comprise an oxidation layer therebetween, and the oxidation layer has a thickness of 10,000 nm ± 3,000 nm.

[0021] The second aspect of the present application provides a plating mechanism for forming a coating layer on a surface of a substrate, the plating mechanism comprising: a particle source, the particle source being arranged apart from the substrate, the substrate comprising a first side and a second side adjacent to each other, the particle source being configured to sputter film layer particles toward the first side and the second side; a first rotating shaft, the first rotating shaft being connected to the substrate; and a driving assembly, an output end of the driving assembly being connected to the first rotating shaft, the driving assembly being configured to drive the first rotating shaft to rotate at different speeds, the first rotating shaft being configured to drive the substrate to rotate at different speeds, so as to reduce a difference between a thickness of the coating layer on the first side and a thickness of the coating layer on the second side.

[0022] In some embodiments, the substrate comprises a first state and a second state, in the first state, the first side faces the particle source, and a first distance exists between the first side and the particle source; in the second state, the second side faces the particle source, and a second distance exists between the second side and the particle source, wherein the first distance is smaller than the second distance; during switching from the first state to the second state, the rotation speed of the substrate gradually decreases; during switching from the second state to the first state, the rotation speed of the substrate gradually increases.

[0023] In some embodiments, the driving assembly comprises a driving member, a first elliptical gear and a second elliptical gear, the output end of the driving member is connected to the first elliptical gear, the first elliptical gear and the second elliptical gear are meshed, the second elliptical gear is connected to the first rotation shaft, and the axis of the second elliptical gear is collinear with the axis of the first rotation shaft; the driving member drives the first elliptical gear to rotate, the first elliptical gear drives the second elliptical gear to rotate, and the second elliptical gear drives the first rotation shaft to rotate.

[0024] In some embodiments, in the first state, the tooth part corresponding to the long axis of the first elliptical gear is meshed with the tooth part corresponding to the short axis of the second elliptical gear; in the second state, the tooth part corresponding to the short axis of the first elliptical gear is meshed with the tooth part corresponding to the long axis of the second elliptical gear.

[0025] In some embodiments, the driving member comprises a driving motor, a driving gear and a second rotation shaft; the output end of the driving motor is connected to the driving gear, the driving gear is connected to the second rotation shaft, the first elliptical gear is connected to the second rotation shaft, and the axis of the first elliptical gear is collinear with the axis of the second rotation shaft; the driving motor drives the driving gear to rotate, the driving gear drives the second rotation shaft to rotate, and the second rotation shaft drives the first elliptical gear to rotate.

[0026] In some embodiments, the driving gear comprises a first auxiliary gear and a second auxiliary gear; the driving motor is connected to the first auxiliary gear, the first auxiliary gear and the second auxiliary gear are meshed, the second auxiliary gear is connected to the second rotation shaft, and the axis of the second auxiliary gear is collinear with the axis of the second rotation shaft; the driving motor drives the first auxiliary gear to rotate, the first auxiliary gear drives the second auxiliary gear to rotate, and the second auxiliary gear drives the second rotation shaft to rotate.

[0027] The third aspect of the present application provides a manufacturing method of a shell, the manufacturing method comprising: disposing a coating layer on a side surface of a substrate, and making a difference between thicknesses of the coating layer on any two adjacent side surfaces of the substrate less than or equal to a preset threshold value, to obtain the shell.

[0028] In some embodiments, the disposing of the coating layer on the side surface of the substrate specifically comprises: plating a base layer on a surface of the substrate; plating an intermediate plating layer on a surface of the base layer away from the surface of the substrate; and plating a surface plating layer on a surface of the intermediate plating layer away from the surface of the substrate.

[0029] In some embodiments, the material of the substrate comprises metal; and before the plating of the base layer on the surface of the substrate, the manufacturing method further comprises: performing an oxidation treatment on the substrate to form an oxidation layer on the surface of the substrate.

[0030] The fourth aspect of the present application provides an electronic device, comprising a device main body and the shell according to any one of the above embodiments, wherein the device main body is accommodated in the shell.

[0031] In the shell provided by the embodiments of the present application, the shell comprises a substrate and a coating layer, the coating layer is disposed on a surface of the substrate, and a difference between thicknesses of the coating layer on any two adjacent side surfaces of the substrate is less than or equal to a preset threshold value. The difference between thicknesses of the coating layer on different side surfaces of the substrate is small, so that the uniformity of the thickness of the coating layer of the substrate is good, and the problem of color difference on the surface of the substrate due to different thicknesses of the coating layer is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0033] FIG. 1 is a schematic diagram of a perspective structure of a substrate provided by an embodiment of the present application.

[0034] FIG. 2 is a schematic diagram of a cross-sectional structure of a shell provided by an embodiment of the present application.

[0035] FIG. 3 is a schematic diagram of a cross-sectional structure of a shell provided by another embodiment of the present application.

[0036] FIG. 4 is a schematic diagram of a perspective structure of a plating mechanism provided by an embodiment of the present application.

[0037] FIG. 5 is a schematic diagram of a perspective structure of a plating mechanism provided by another embodiment of the present application.

[0038] FIG. 6 is a schematic diagram of a flow of a manufacturing method of a shell provided by an embodiment of the present application.

[0039] Fig. 7 is a perspective structural schematic diagram of an electronic device provided by an embodiment of the present application.

[0040] Marker explanation: 100, coating; 110, primer layer; 120, intermediate plating layer; 130, surface plating layer; 121, first plating layer; 122, second plating layer; 200, shell; 210, oxidation layer; 220, substrate; 201, back plate; 202, frame; 221, first side; 222, second side; 223, end face; 300, electronic device; 310, device body; 400, plating mechanism; 410, particle source; 420, first rotating shaft; 430, driving assembly; 431, driving piece; 432, first oval gear; 433, second oval gear; 4331, second tooth part; 4321, first tooth part; 4311, driving motor; 4312, driving gear; 4313, second rotating shaft; 4314, first auxiliary gear; 4315, second auxiliary gear. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items.

[0044] Some embodiments of the present application will be described in detail below with reference to the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0045] Referring to FIGS. 1-3, the embodiment of the present application provides a shell 200, which comprises a substrate 220 and a coating layer 100, the coating layer 100 is arranged on the surface of the substrate 220, and the difference between the thicknesses of the coating layer 100 on any two adjacent sides of the substrate 220 is less than or equal to a preset threshold. The difference between the thicknesses of the coating layer 100 on any two adjacent sides of the substrate 220 is small, the uniformity of the thickness of the coating layer of the substrate 220 is good, and the problem of color difference on the surface of the substrate 220 due to different coating thicknesses can be avoided.

[0046] In the embodiment of the present application, the preset threshold is less than or equal to 50 nm. For example, the preset threshold is 50 nm, that is, the absolute value of the difference between the thicknesses of the coating layer 100 on any two adjacent sides is less than or equal to 50 nm. Of course, other preset thresholds can be set according to the use requirements, for example, the preset threshold can also be 40 nm, that is, the absolute value of the difference between the thicknesses of the coating layer 100 on any two adjacent sides is less than or equal to 40 nm; for example, the preset threshold can also be 30 nm, that is, the absolute value of the difference between the thicknesses of the coating layer 100 on any two adjacent sides is less than or equal to 30 nm, which is not listed one by one.

[0047] In the embodiment of the present application, the surface of the substrate 220 comprises two first sides 221, two second sides 222 and two end faces 223, the two first sides 221 are arranged opposite along the length direction of the substrate 220, the two second sides are arranged opposite along the width direction of the substrate 220, and the two end faces 223 are arranged opposite along the thickness direction of the substrate 220. The first side 221, the second side 222 and the end face 223 are arranged adjacent to each other and at an angle between each other. For example, the substrate 220 is a cuboid structure, that is, the first side 221, the second side 222 and the end face 223 are perpendicular to each other, and the surface of the substrate 220 is more regular, which is convenient for processing. In other embodiments, the substrate 220 can also have other structures, for example, a triangular prism structure, a pentagonal prism structure or other shapes, which are not limited here.

[0048] The difference in coating thickness between any two adjacent sides of the substrate 220 refers to the difference between the coating thickness on the first side 221 and the coating thickness on the second side 222. Specifically, the coating thickness on the first side 221 is determined by cutting the housing 200 along a direction parallel to the first side 221 to create at least one first slice, then selecting at least one location on the first slice to test the coating thickness, obtaining a first thickness value. If there are multiple first thickness values, the first average value is taken. The coating thickness on the second side 222 is determined by cutting the housing 200 along a direction parallel to the second side 222 to create at least one second slice, then selecting at least one location on the second slice to test the coating thickness, obtaining a second thickness value. If there are multiple second thickness values, the second average value is taken. The difference in coating thickness between any two adjacent sides refers to the absolute value of the difference between the first thickness value and the second thickness value. Alternatively, the difference in coating thickness between any two adjacent sides can also refer to the absolute value of the difference between the first average value and the second average value.

[0049] In the embodiments of this application, the substrate 220 is made of metal, that is, the substrate 220 is made of metal material, and the substrate 220 may be made of aluminum, aluminum alloy, zinc, zinc alloy, magnesium, cadmium, titanium alloy or other materials.

[0050] An oxide layer 210 is also included between the substrate 220 and the coating 100. The oxide layer 210 is formed on the surface of the substrate 220 and has good adhesion properties, which helps to improve the adhesion between the coating 100 and the substrate 220. The coating 100 is disposed on the surface of the oxide layer 210 facing away from the substrate 220. On the one hand, it is used to give the shell 200 different colors, and on the other hand, it can increase the hardness of the shell 200 and enhance its wear resistance. The oxide layer 210 refers to a thin film formed on the surface of the substrate 220 under the action of an applied current in a corresponding electrolyte and under specific process conditions. The oxide layer 210 has advantages such as decorative properties, insulation, and improved adhesion to organic coatings or inorganic covering layers. The thickness of the oxide layer is between 10000nm ± 3000nm to improve the connection reliability of the substrate 220. Optionally, the thickness of the oxide layer 210 can be, but is not limited to, 7000nm, 8000nm, 9000nm, 10000nm, 11000nm, 12000nm, and 13000nm, which will not be listed here.

[0051] In other embodiments, the substrate 220 may be made of a non-metallic material. For example, the substrate 220 may be made of glass; or, for example, the substrate 220 may be made of ceramic. The substrate 220 is made of a non-metallic material, and the coating 100 is directly disposed on the surface of the substrate 220.

[0052] In some embodiments, the color difference of the coating 100 on any two adjacent sides of the substrate 220 satisfies: AL < 5, Da < 3, Db < 3. The color difference of the coating 100 on any two adjacent sides of the substrate 220 refers to the color difference of the coating on the first side 221 and the second side 222. The color difference of the coating on the first side 221 and the second side 222 is small, the color consistency of the first side 221 and the second side 222 is strong, and the problem of shell color difference can be avoided.

[0053] The color value of the coating 100 includes a first color value L, a second color value a, and a third color value b. The first color value L represents a range from black to white, and the range of the first color value L is 0 to 100, wherein the first color value L is 0, indicating black; the first color value L is 100, indicating white. The second color value a represents a range from green to magenta, and the range of the second color value a is -128 to +127, wherein the second color value a is -128, indicating green; the second color value a is +127, indicating magenta. The third color value b represents a range from blue to yellow, and the range of the third color value b is -128 to +127, wherein the third color value b is -128, indicating blue; the third color value b is +127, indicating yellow.

[0054] Generally, a color difference meter is used to measure the first color value L, the second color value a, and the third color value b of the surface of the shell 200. Specifically, the color value test is performed at least one place on the first side 221 to obtain L1, a1, and b1. If there are multiple L1, multiple a1, and multiple b1, the average value of the multiple L1, the average value of the multiple a1, and the average value of the multiple b1 are taken. The color difference test is performed at least one place on the second side 222 to obtain L2, a2, and b2. If there are multiple L2, multiple a2, and multiple b2, the average value of the multiple L2, the average value of the multiple a2, and the average value of the multiple b2 are taken.

[0055] The color difference of the coating 100 on the first side 221 and the second side 222 should satisfy the following conditions: AL is equal to the absolute value of the difference between L1 and L2, Da is equal to the absolute value of the difference between a1 and a2, Db is equal to the absolute value of the difference between b1 and b2. The color difference of the coating 100 on the first side 221 and the second side 222 should also satisfy the following conditions: AL is equal to the absolute value of the difference between the average value of the multiple L1 and the average value of the multiple L2, Da is equal to the absolute value of the difference between the average value of the multiple a1 and the average value of the multiple a2, Db is equal to the absolute value of the difference between the average value of the multiple b1 and the average value of the multiple b2.

[0056] In some embodiments, the coating 100 comprises a primer layer 110, an intermediate plating layer 120 and a surface plating layer 130 arranged in sequence, the primer layer 110 is arranged between the substrate 220 (or the oxidation layer 210) and the intermediate plating layer 120. The surface plating layer 130 comprises at least one of nitride silicon chromium, titanium nitride, chromium nitride, tungsten carbide and carbon-nitride silicon chromium. By changing the composition of the surface plating layer 130, the surface plating layer 130 can present different colors, that is, the surface of the shell 200 can present different colors.

[0057] In some embodiments, if the surface plating layer 130 comprises nitride silicon chromium, the coating 100 presents purple color. In some embodiments, if the surface plating layer 130 comprises titanium nitride, the surface of the shell 200 presents gold color. In some embodiments, if the surface plating layer 130 comprises chromium nitride, the surface of the shell 200 presents silver color. In some embodiments, if the surface plating layer 130 comprises tungsten carbide or carbon-nitride silicon chromium, the surface of the shell 200 presents black color. In some embodiments, the surface plating layer 130 comprises two or more different components, and the surface of the shell 200 can present more rich colors. In other embodiments, the thickness of the surface plating layer 130 can also be changed by interference principle to make the surface of the shell 200 present different colors.

[0058] In the embodiments of the present application, the thickness of the surface plating layer 130 is between 200 nm±20 nm. When the thickness of the surface plating layer 130 is within the above range, the hardness of the surface plating layer 130 can be improved, and the wear resistance of the surface plating layer 130 can be enhanced. In some embodiments, the thickness of the surface plating layer 130 can be, but is not limited to, 180 nm, 190 nm, 200 nm, 210 nm, 220 nm, and the like.

[0059] The surface plating layer 130 comprises at least one of chromium nitride and nitride silicon chromium. During the use of the coating 100, the chromium ions and silicon ions in the surface plating layer 130 can combine with the oxygen ions in the air, respectively, the chromium ions combine with the oxygen ions to form chromium oxide, and the silicon ions combine with the oxygen ions to form silicon oxide. The chromium oxide and the silicon oxide have corrosion resistance, which can improve the corrosion resistance of the coating 100.

[0060] The surface plating layer 130 comprises vanadium element. During the use of the shell 200, the vanadium element exists in the surface plating layer 130 in the form of vanadium ions, the vanadium ions in the surface plating layer 130 combine with the oxygen ions in the air, thereby forming vanadium oxide. The hardness of the vanadium oxide is high, which can enhance the overall hardness of the coating 100, thereby improving the wear resistance of the coating 100 and avoiding the problem of color difference on the surface of the shell due to scratching.

[0061] In some embodiments, as shown in FIG. 2, the intermediate plating layer 120 includes a first plating layer 121 and a second plating layer 122, which are arranged between the primer layer 110 and the surface plating layer 130, and are stacked with each other, so as to improve the hardness of the coating 100.

[0062] At least one of the first plating layer 121 and the second plating layer 122 contains vanadium elements, so as to improve the wear resistance of the coating 100.

[0063] In some embodiments, the first plating layer 121 contains vanadium elements, which exist in the form of vanadium ions in the first plating layer 121 during the use of the coating 100, and combine with oxygen ions in the air to form vanadium oxide, which has high hardness and can enhance the overall hardness of the coating 100, so as to improve the wear resistance of the coating 100.

[0064] In some embodiments, the second plating layer 122 contains vanadium elements, which exist in the form of vanadium ions in the second plating layer 122 during the use of the coating 100, and combine with oxygen ions in the air to form vanadium oxide, which has high hardness and can enhance the overall hardness of the coating 100, so as to improve the wear resistance of the coating 100.

[0065] In some embodiments, the first plating layer 121 and the second plating layer 122 both contain vanadium elements, which exist in the form of vanadium ions in the first plating layer 121 and the second plating layer 122 during the use of the coating 100, and combine with oxygen ions in the air to form vanadium oxide, which has high hardness and can enhance the overall hardness of the coating 100, so as to improve the wear resistance of the coating 100.

[0066] In the present embodiment, the thickness of the first plating layer 121 is between 200 nm±20 nm, which can improve the hardness of the first plating layer 121 and enhance the wear resistance of the first plating layer 121. Optionally, the thickness of the first plating layer 121 can be, but is not limited to, 180 nm, 190 nm, 200 nm, 210 nm, 220 nm, and the like.

[0067] The thickness of the second plating layer 122 is between 200 nm±20 nm, which can improve the hardness of the second plating layer 122 and enhance the wear resistance of the second plating layer 122. Optionally, the thickness of the second plating layer 122 can be, but is not limited to, 180 nm, 190 nm, 200 nm, 210 nm, 220 nm, and the like.

[0068] In some embodiments, as shown in FIG. 3, the intermediate plating layer 120 includes a plurality of first plating layers 121 and a plurality of second plating layers 122, the plurality of first plating layers 121 and the plurality of second plating layers 122 are arranged between the base layer 110 and the surface plating layer 130, and the plurality of first plating layers 121 and the plurality of second plating layers 122 are arranged alternately, which can improve the hardness of the coating 100.

[0069] At least one of the plurality of first plating layers 121 and the plurality of second plating layers 122 contains vanadium elements, that is, at least one of the plurality of first plating layers 121 contains vanadium elements, or at least one of the plurality of second plating layers 122 contains vanadium elements, or at least one of the plurality of first plating layers 121 and at least one of the plurality of second plating layers 122 contain vanadium elements, which can improve the wear resistance of the coating 100.

[0070] For example, one of the plurality of first plating layers 121 is arranged between the base layer 110 and the second plating layer 122, and the other first plating layer 121 is arranged between the surface plating layer 130 and the second plating layer 122. In this example, the number of first plating layers 121 is three, and the number of second plating layers 122 is two. From the surface plating layer 130 to the oxidation layer 210, the coating 100 includes the surface plating layer 130, the first first plating layer 121, the first second plating layer 122, the second first plating layer 121, the second second plating layer 122, the third first plating layer 121, and the base layer 110. Among them, the first plating layer 121 contains chromium nitride, and the second plating layer 122 contains chromium silicon nitride. Of course, the first plating layer 121 can contain chromium silicon nitride, and the second plating layer 122 can contain chromium nitride.

[0071] In other examples, the number of first plating layers 121 can be other numbers, which can be but not limited to two, four, five, ten, etc., and the number of second plating layers 122 can be other numbers, which can be but not limited to one, three, four, nine, etc., which are not limited here.

[0072] In some embodiments, the base layer 110 contains chromium single element, which has high corrosion resistance and slow oxidation rate. In addition, the chromium single element also has high hardness, which can improve the impact resistance of the coating 100.

[0073] In this embodiment, the thickness of the base layer 110 is between 300 nm ± 30 nm, and the thickness of the base layer 110 within the above range can protect the oxidation layer 210. In some embodiments, the thickness of the base layer 110 can be but not limited to 270 nm, 280 nm, 290 nm, 300 nm, 310 nm, 320 nm, 330 nm, which are not listed one by one.

[0074] Please refer to FIG. 4 and FIG. 5, the embodiment of the present application provides a coating mechanism 400, the coating mechanism 400 includes a particle source 410, a first rotating shaft 420 and a driving assembly 430. The coating mechanism 400 is used for forming a coating layer 100 on the surface of a substrate 220. The surface of the substrate 220 is provided with an oxidation layer 210, and the coating mechanism 400 is used for forming the coating layer 100 on the surface of the oxidation layer 210. The oxidation layer 210 has good adhesion, which is beneficial to improve the bonding force between the coating layer 100 and the oxidation layer 210, thereby increasing the reliability of the connection between the coating layer 100 and the oxidation layer 210.

[0075] The particle source 410 is arranged apart from the substrate 220, wherein the position of the particle source 410 is fixed relative to the driving assembly 430, the substrate 220 can rotate around the central line direction, and the extension direction of the central line of the substrate 220 is parallel to the thickness direction of the substrate 220. The distance between the first side surface 221 and the particle source 410 and the distance between the second side surface 222 and the particle source 410 are different, the particle source 410 is used for sputtering film layer particles to the first side surface 221 and the second side surface 222 of the substrate 220, the film layer particles are deposited on the first side surface 221, and the film layer particles are deposited on the second side surface 222, thereby forming a coating layer on the first side surface 221 and the second side surface 222.

[0076] The first rotating shaft 420 is connected with the substrate 220, and the axis of the first rotating shaft 420 is collinear with the central line of the substrate 220. The output end of the driving assembly 430 is connected with the first rotating shaft 420, the driving assembly 430 is used for driving the first rotating shaft 420 to rotate at different speeds, and the first rotating shaft 420 is used for driving the substrate 220 to rotate at different speeds, so as to reduce the difference between the coating thickness of the first side surface 221 and the coating thickness of the second side surface 222, and make the uniformity of the coating thickness of the substrate 220 good.

[0077] In the embodiment of the present application, the substrate 220 includes a first state and a second state during rotation around the central line. When the substrate 220 is in the first state, the first side surface 221 faces the particle source 410, and the first side surface 221 has a first distance D1 from the particle source 410. When the substrate 220 is in the second state, the second side surface 222 faces the particle source 410, and the second side surface 222 has a second distance D2 from the particle source 410. The first distance D1 is less than the second distance D2. During the process of switching the substrate 220 from the first state to the second state, the rotation speed of the substrate 220 gradually decreases, and during the process of switching the substrate 220 from the second state to the first state, the rotation speed of the substrate 220 gradually increases.

[0078] It should be understood that the spacing between the surface of the substrate 220 and the particle source 410 is negatively correlated with the deposition rate of the surface of the substrate 220 directly sputtered by the particle source 410. The greater the spacing between the surface of the substrate 220 and the particle source 410, the smaller the deposition rate of the surface of the substrate 220 directly sputtered by the particle source 410; the smaller the spacing between the surface of the substrate 220 and the particle source 410, the greater the deposition rate of the surface of the substrate 220 directly sputtered by the particle source 410. Therefore, the thickness of the coating 100 of the substrate 220 is negatively correlated with the spacing between the surface of the substrate 220 and the particle source 410, the greater the spacing between the surface of the substrate 220 and the particle source 410, the smaller the thickness of the coating 100 of the substrate 220, and the smaller the spacing between the surface of the substrate 220 and the particle source 410, the greater the thickness of the coating 100 of the substrate 220.

[0079] The rotation speed of the substrate 220 is negatively correlated with the deposition time of the surface of the substrate 220 directly sputtered by the particle source 410. The greater the rotation speed of the substrate 220, the less the deposition time of the surface of the substrate 220 directly sputtered by the particle source 410; the smaller the rotation speed of the substrate 220, the more the deposition time of the surface of the substrate 220 directly sputtered by the particle source 410. Therefore, the thickness of the coating 100 of the substrate 220 is negatively correlated with the rotation speed of the substrate 220, the faster the rotation speed of the substrate 220, the smaller the thickness of the coating 100 of the substrate 220, and the slower the rotation speed of the substrate 220, the greater the thickness of the coating 100 of the substrate 220.

[0080] In the coating mechanism provided by the related art, the output end of the driving assembly is connected to the first rotating shaft, the driving assembly drives the first rotating shaft to rotate at the same speed, and the first rotating shaft drives the substrate to rotate at the same speed, and different sides of the substrate rotate at the same speed. The deposition time of different sides of the substrate directly sputtered by the particle source is basically the same. However, because the distances of different sides of the substrate to the particle source are different, the coating thickness uniformity of the substrate is poor when the coating mechanism provided by the related art is used to coat the surface of the substrate. In addition, for a substrate with an interference color coating, such as a substrate with a purple, blue, green, or other interference color coating, poor coating thickness uniformity can cause the color of the surface of the substrate to be uneven, and the surface of the substrate is prone to color difference.

[0081] In the coating mechanism 400 provided in the embodiments of the present application, when the substrate 220 is in the first state, the first side surface 221 faces the particle source 410, the distance between the first side surface 221 and the particle source 410 is small, the deposition rate of the first side surface 221 directly sputtered by the particle source 410 is high; the rotation speed of the substrate 220 is fast, and the deposition time of the first side surface 221 directly sputtered by the particle source 410 is short. When the substrate 220 is in the second state, the second side surface 222 faces the particle source 410, the distance between the second side surface 222 and the particle source 410 is large, the deposition rate of the second side surface 222 directly sputtered by the particle source 410 is low; the rotation speed of the substrate 220 is slow, and the deposition time of the second side surface 222 directly sputtered by the particle source 410 is short.

[0082] Therefore, the coating mechanism 400 provided in the embodiments of the present application can reduce the difference between the coating thickness of the first side surface 221 and the coating thickness of the second side surface 222 when the substrate 220 is coated on the surface, and improve the uniformity of the coating 100. In addition, for the substrate with an interference color coating, such as a substrate with a purple, blue, green or other interference color coating, the improvement of the uniformity of the thickness of the coating can avoid the problem of different colors on the surface of the substrate 220 due to the different thicknesses of the coating 100.

[0083] In the connection relationship between the substrate 220 and the first rotating shaft 420, the substrate 220 is provided with a first connecting hole, the first connecting hole of the substrate 220 penetrates the two end surfaces 223 along the thickness direction of the substrate 220, the first rotating shaft 420 is fixed in the first connecting hole of the substrate 220, and the hole wall surface of the above-mentioned first connecting hole abuts against the first rotating shaft 420, so as to fixedly connect the first rotating shaft 420 with the substrate 220. In other embodiments, one of the end surfaces 223 of the substrate 220 is provided with a first connecting hole, the first connecting hole is recessed in the above-mentioned end surface 223, one end of the first rotating shaft 420 is inserted into the first connecting hole, so as to fix the first rotating shaft 420 in the first connecting hole; the cooperation mode of the first rotating shaft 420 and the above-mentioned first connecting hole can be but is not limited to clamping, threading, gluing or other modes, which are not limited herein. In other embodiments, the substrate 220 is not provided with the first connecting hole, and one end of the first rotating shaft 420 is fixed with one of the end surfaces 223 of the substrate 220 by gluing.

[0084] In some embodiments, the driving assembly 430 comprises a driving member 431, a first oval gear 432 and a second oval gear 433, the output end of the driving member 431 is connected to the first oval gear 432, the first oval gear 432 and the second oval gear 433 are meshingly connected, the second oval gear 433 is connected to the first rotating shaft 420, and the axis of the second oval gear 433, the axis of the first rotating shaft 420 and the center line of the base plate 220 are collinear. The driving member 431 drives the first oval gear 432 to rotate, the first oval gear 432 drives the second oval gear 433 to rotate, and the second oval gear 433 drives the first rotating shaft 420 to rotate.

[0085] Specifically, the first oval gear 432 comprises a first surface, a second surface and a first peripheral surface, the first surface and the second surface are oppositely arranged along the thickness direction of the first oval gear 432, the first peripheral surface is connected between the first surface and the second surface, and the first peripheral surface is provided with a plurality of first tooth portions 4321 which are arranged in a circumferential direction around the axis of the first oval gear 432. The second oval gear 433 comprises a third surface, a fourth surface and a second peripheral surface, the third surface and the fourth surface are oppositely arranged along the thickness direction of the second oval gear 433, the second peripheral surface is connected between the third surface and the fourth surface, and the second peripheral surface is provided with a plurality of second tooth portions 4331 which are arranged in a circumferential direction around the axis of the second oval gear 433. The first oval gear 432 and the second oval gear 433 are meshingly connected through the first tooth portions 4321 and the second tooth portions 4331.

[0086] In the embodiments of the present application, the first surface and the second surface of the first oval gear 432 are elliptical, the third surface and the fourth surface of the second oval gear 433 are elliptical, the shapes and sizes of the first surface, the second surface, the third surface and the fourth surface are the same, the ratio of the length of the major axis to the length of the minor axis of the first oval gear 432 is in the range of 1.15 to 1.5, and the ratio of the length of the major axis to the length of the minor axis of the second oval gear 433 is in the range of 1.15 to 1.5.

[0087] It can be understood that the length of the major axis of the first oval gear 432 is the length of the major axis of the first surface or the second surface, and the length of the minor axis of the first oval gear 432 is the length of the minor axis of the first surface or the second surface. The length of the major axis of the second oval gear 433 is the length of the major axis of the third surface or the fourth surface, and the length of the minor axis of the second oval gear 433 is the length of the minor axis of the third surface or the fourth surface.

[0088] In the process of driving the first elliptical gear 432 to rotate by the driving member 431, the linear speed of the first circumferential surface of the first elliptical gear 432 is the same as the linear speed of the second circumferential surface of the second elliptical gear 433. In the first elliptical gear 432, the distance between the two adjacent first tooth portions 4321 and the axis of the first elliptical gear 432 is different. In the second elliptical gear 433, the distance between the two adjacent second tooth portions 4331 and the axis of the second elliptical gear 433 is different. The first elliptical gear 432 drives the second elliptical gear 433 to rotate at different angular speeds, the second elliptical gear 433 drives the first rotating shaft 420 to rotate at different angular speeds, and the first rotating shaft 420 drives the substrate 220 to rotate at different angular speeds. The rotation speed of the first side surface 221 of the substrate 220 is different from that of the second side surface 222.

[0089] In the embodiments of the present application, as shown in FIG. 5, when the substrate 220 is in the first state, the tooth portion corresponding to the long axis of the first elliptical gear 432 is in meshing connection with the tooth portion corresponding to the short axis of the second elliptical gear 433. As shown in FIG. 4, when the substrate 220 is in the second state, the tooth portion corresponding to the short axis of the first elliptical gear 432 is in meshing connection with the tooth portion corresponding to the long axis of the second elliptical gear 433.

[0090] Specifically, the first side surface 221 is perpendicular to the second side surface 222, and the long axis direction of the second elliptical gear 433 is parallel to the first side surface 221. When the substrate 220 is in the first state, that is, when the first side surface 221 faces the particle source 410, the first side surface 221 is parallel to the long axis direction of the second elliptical gear 433, and the long axis direction of the second elliptical gear 433 is perpendicular to the long axis direction of the first elliptical gear 432. When the substrate 220 is in the second state, that is, when the second side surface 222 faces the particle source 410, the second side surface 222 is parallel to the short axis direction of the second elliptical gear 433, and the short axis direction of the second elliptical gear 433 is perpendicular to the short axis direction of the first elliptical gear 432. In this way, in the process of switching the substrate 220 from the first state to the second state, the rotation speed of the substrate 220 gradually decreases; or, in the process of switching the substrate 220 from the second state to the first state, the rotation speed of the substrate 220 gradually increases.

[0091] It can be understood that the short axis direction of the first elliptical gear 432 refers to the short axis direction of the first surface or the second surface, the long axis direction of the first elliptical gear 432 refers to the long axis direction of the first surface or the second surface, the short axis direction of the second elliptical gear 433 refers to the short axis direction of the third surface or the fourth surface, and the long axis direction of the second elliptical gear 433 refers to the long axis direction of the third surface or the fourth surface.

[0092] In other embodiments, the first side surface 221 is perpendicular to the second side surface 222, and the angle between the long axis direction of the second oval gear 433 and the first side surface 221 ranges from 0° to 90°.

[0093] In other embodiments, the substrate 220 is a cylindrical structure, that is, the distance between the first side surface 221 of the substrate 220 and the particle source 410 is the same as the distance between the second side surface 222 of the substrate 220 and the particle source 410. The first oval gear 432 is a circular gear, and the second oval gear 433 is a circular gear, that is, the first surface and the second surface of the first oval gear 432 are circular, the third surface and the fourth surface of the second oval gear 433 are circular, the shapes and sizes of the first surface, the second surface, the third surface, and the fourth surface are the same, and the ratio of the length of the long axis to the length of the short axis of the first surface is 1, that is, the length of the long axis is the same as the length of the short axis.

[0094] In the connection relationship between the second oval gear 433 and the first rotating shaft 420, the second oval gear 433 is provided with a second connecting hole, the second connecting hole of the second oval gear 433 penetrates the third surface and the fourth surface of the second oval gear 433, and the first rotating shaft 420 is fixed in the second connecting hole of the second oval gear 433. The hole wall surface of the above-mentioned second connecting hole abuts against the first rotating shaft 420, so as to fixedly connect the first rotating shaft 420 and the second oval gear 433. In other embodiments, the surface of the second oval gear 433 facing the substrate 220 is provided with a second connecting hole, the second connecting hole is recessed in the surface of the second oval gear 433 facing the substrate 220, one end of the first rotating shaft 420 is inserted into the second connecting hole, so as to fix the first rotating shaft 420 in the second connecting hole; the cooperation mode of the first rotating shaft 420 and the above-mentioned second connecting hole can be but is not limited to clamping, threading, gluing, or other modes, which are not limited herein. In other embodiments, the surface of the second oval gear 433 is not provided with a second connecting hole, and one end of the first rotating shaft 420 is fixed to the surface of the second oval gear 433 facing the substrate 220 by gluing.

[0095] In some embodiments, the driving member 431 includes a driving motor 4311, a driving gear 4312, and a second rotating shaft 4313; the output end of the driving motor 4311 is connected to the driving gear 4312, the driving gear 4312 is connected to the second rotating shaft 4313, and the first oval gear 432 is connected to the second rotating shaft 4313; the axis of the first oval gear 432 and the axis of the second rotating shaft 4313 are collinear, the driving motor 4311 drives the driving gear 4312 to rotate, the driving gear 4312 drives the second rotating shaft 4313 to rotate, and the second rotating shaft 4313 drives the first oval gear 432 to rotate. The driving motor 4311 is used to drive the driving gear 4312 to rotate, which is convenient to operate.

[0096] Further, the driving gear 4312 comprises a first auxiliary gear 4314 and a second auxiliary gear 4315; the driving motor 4311 is connected with the first auxiliary gear 4314, the first auxiliary gear 4314 is connected with the second auxiliary gear 4315 in a meshing mode, and the second auxiliary gear 4315 is connected with the second rotating shaft 4313. The axis of the second auxiliary gear 4315 is collinear with the axis of the second rotating shaft 4313. The driving motor 4311 drives the first auxiliary gear 4314 to rotate, the first auxiliary gear 4314 drives the second auxiliary gear 4315 to rotate, and the second auxiliary gear 4315 drives the second rotating shaft 4313 to rotate.

[0097] In the embodiment, the first auxiliary gear 4314 and the second auxiliary gear 4315 are circular gears, and the radii of the first auxiliary gear 4314 and the second auxiliary gear 4315 are different, so that the rotating speed ratio of the first auxiliary gear 4314 and the second auxiliary gear 4315 can be changed, and the rotating speed of the second rotating shaft 4313 can be changed. The rotating speed of the second rotating shaft 4313 can be adjusted by adjusting the radius ratio of the first auxiliary gear 4314 and the second auxiliary gear 4315, and the operation is convenient.

[0098] In the connection relationship between the second auxiliary gear 4315 and the second rotating shaft 4313, the second auxiliary gear 4315 is provided with a third connecting hole, the third connecting hole of the second auxiliary gear 4315 penetrates the second auxiliary gear 4315 along the thickness direction of the second auxiliary gear 4315, and the second rotating shaft 4313 is fixed in the third connecting hole of the second auxiliary gear 4315. The hole wall surface of the third connecting hole abuts against the second rotating shaft 4313, so that the second rotating shaft 4313 is fixedly connected with the second auxiliary gear 4315. In other embodiments, one surface of the second auxiliary gear 4315 is provided with a third connecting hole, the third connecting hole is recessed in the surface of the second auxiliary gear 4315, one end of the second rotating shaft 4313 is inserted into the third connecting hole, so that the second rotating shaft 4313 is fixed in the third connecting hole. The matching mode of the second rotating shaft 4313 and the third connecting hole can be but is not limited to clamping, threading, gluing or other modes, which is not limited herein. In other embodiments, the second auxiliary gear 4315 is not provided with the third connecting hole, and one end of the second rotating shaft 4313 is fixed to the surface of the second auxiliary gear 4315 by gluing.

[0099] In some embodiments, the film coating mechanism 400 comprises a plurality of particle sources 410 corresponding to different materials. When coating the surface of the substrate 220, only different particle sources 410 need to be turned on, so that different material films can be coated on the surface of the substrate 220.

[0100] In combination with FIGS. 2-5, the coating mechanism 400 includes a base layer particle source for depositing a base layer 110 on a surface of the oxide layer 210 of the substrate 220. In this example, the base layer particle source is a chromium particle source.

[0101] The coating mechanism 400 also includes an intermediate layer particle source for depositing an intermediate layer 120 on a surface of the base layer 110 away from the substrate 220. Of course, vanadium can be added to the intermediate layer particle source to increase the overall hardness of the intermediate layer 120, thereby increasing the wear resistance of the coating 100. In this example, the intermediate layer particle source is at least one of a chromium nitride particle source or a chromium silicon nitride particle source. The intermediate layer particle source includes a first layer particle source and a second layer particle source.

[0102] Illustratively, as shown in FIG. 2, the first layer particle source is used to deposit a first layer 121 on a surface of the base layer 110 away from the substrate 220. The second layer particle source is used to deposit a second layer 122 on a surface of the first layer 121 away from the substrate 220.

[0103] Illustratively, as shown in FIG. 3, the first layer particle source is used to deposit a first first layer 121 on a surface of the base layer 110 away from the substrate 220. The second layer particle source is used to deposit a first second layer 122 on a surface of the first first layer 121 away from the substrate 220. The first layer particle source is used to deposit a second first layer 121 on a surface of the first second layer 122 away from the substrate 220. The second layer particle source is used to deposit a second second layer 122 on a surface of the second first layer 121 away from the substrate 220. The first layer particle source is used to deposit a third first layer 121 on a surface of the second second layer 122 away from the substrate 220.

[0104] The coating mechanism 400 also includes a surface layer particle source for depositing a surface layer 130 on a surface of the intermediate layer 120 away from the substrate 220. Of course, vanadium can be added to the surface layer particle source to increase the overall hardness of the surface layer 130, thereby increasing the wear resistance of the coating 100. In this example, the surface layer particle source is at least one of a chromium silicon nitride particle source, a titanium nitride particle source, a chromium nitride particle source, a tungsten carbide particle source, or a chromium silicon carbon nitride particle source.

[0105] Referring to FIG. 6, the present application provides a method for manufacturing a shell. The method includes: disposing a coating on a side of a substrate, and making a difference between thicknesses of the coating on any two adjacent sides of the substrate less than or equal to a preset threshold, to obtain the shell in the above embodiments. Specifically, the method includes the following steps:

[0106] 601. depositing a primer layer on the surface of the substrate.

[0107] The primer layer is deposited by vacuum magnetron sputtering. The deposition mechanism includes a primer layer particle source, wherein the primer layer particle source is a chromium particle source.

[0108] Atoms and atomic groups in the chromium particle source sputter onto the surface of the oxide layer. Since the atoms and atomic groups in the chromium particle source have a certain kinetic energy, they can bombard the surface of the oxide layer, thereby depositing a primer layer on the surface of the oxide layer away from the substrate. The thickness of the primer layer is between 300 nm ± 30 nm, which can protect the oxide layer.

[0109] 602. depositing an intermediate layer on the surface of the primer layer away from the substrate.

[0110] Similar to step 601, the deposition mechanism includes an intermediate layer particle source, which is at least one of a chromium nitride particle source or a chromium silicon nitride particle source. Atoms and atomic groups in the intermediate layer particle source sputter onto the surface of the primer layer. Since the atoms and atomic groups in the intermediate layer particle source have a certain kinetic energy, they can bombard the surface of the primer layer, thereby depositing an intermediate layer on the surface of the primer layer away from the substrate. In some embodiments, vanadium is added to the intermediate layer particle source, which enhances the overall hardness of the intermediate layer and thus improves the wear resistance of the coating.

[0111] In some embodiments, the intermediate layer particle source includes a first layer particle source and a second layer particle source. The first layer particle source deposits a first layer on the surface of the primer layer away from the substrate, and the second layer particle source deposits a second layer on the surface of the first layer away from the substrate. The thickness of the first layer is between 200 nm ± 20 nm, which can improve the hardness and wear resistance of the first layer. The thickness of the second layer is between 200 nm ± 20 nm, which can improve the hardness and wear resistance of the second layer.

[0112] In some embodiments, the intermediate coating particle source includes a first coating particle source and a second coating particle source. In this embodiment, the intermediate coating includes three first coating layers and two second coating layers. From the oxide layer to the undercoat direction, the first coating particle source coats a first first coating layer on the surface of the undercoat layer facing away from the substrate; the second coating particle source coats a first second coating layer on the surface of the first first coating layer facing away from the substrate; the first coating particle source coats a second first coating layer on the surface of the first second coating layer facing away from the substrate; the second coating particle source coats a second second coating layer on the surface of the second first coating layer facing away from the substrate; and the first coating particle source coats a third first coating layer on the surface of the second second coating layer facing away from the substrate. The thickness of the first coating layer is between 200 nm ± 20 nm, which can improve the hardness and wear resistance of the first coating layer. The thickness of the second coating layer is also between 200 nm ± 20 nm, which can improve the hardness and wear resistance of the second coating layer.

[0113] 603. A surface plating layer is deposited on the surface of the intermediate plating layer that is away from the substrate.

[0114] Similar to step 602, the coating mechanism includes a surface coating particle source, which is at least one of a chromium-nitrogen-silicon-nitride particle source, a titanium nitride particle source, a chromium nitride particle source, a tungsten carbide particle source, and a carbon-nitrogen-silicon-chromium particle source. Atoms and atomic groups in the surface coating particle source are sputtered onto the surface of the intermediate coating. Because the atoms and atomic groups in the chromium-nitrogen-silicon-nitride particle source possess kinetic energy, they can bombard the surface of the intermediate coating, thereby depositing a surface coating on the surface of the intermediate coating away from the substrate. In some embodiments, vanadium is added to the surface coating particle source to enhance the overall hardness of the surface coating, thereby improving the wear resistance of the coating. The thickness of the surface coating is between 200 nm ± 20 nm, which can both improve the hardness of the surface coating and enhance its wear resistance.

[0115] In some embodiments, the substrate is made of metal, and the substrate is oxidized before an underlayer is deposited on the surface of the substrate to form an oxide layer on the surface of the substrate.

[0116] Referring to Figure 7, this application provides an electronic device 300. Specifically, the electronic device 300 can be any of various types of computer system devices that are mobile or portable and perform wireless communication, wherein Figure 7 exemplarily illustrates one form. The electronic device 300 includes a device body 310 and a housing 200 provided in the above embodiments. Because the electronic device 300 uses the housing 200 provided in any of the above embodiments, the housing thickness of the electronic device 300 is highly uniform, thereby avoiding the color difference problem caused by different coating thicknesses of the housing 200; in addition, the housing 200 of the electronic device 300 has high hardness and good wear resistance.

[0117] The housing 200 has an accommodating space, and the device body 310 is fixed to the accommodating space. Specifically, the device body 310 may be, but is not limited to, a mobile phone, a portable gaming device, a computer, a portable internet device, a music player, a data storage device, other handheld devices, or a head-mounted device. In some cases, the device body 310 can perform multiple functions, such as playing music, displaying videos, storing pictures, and receiving and sending telephone calls.

[0118] This embodiment uses a mobile phone as an example to illustrate the structure of the electronic device 300, and should not be construed as limiting this application. It is understood that the specific type of the electronic device 300 is not particularly limited, and includes, but is not limited to, mobile phones, laptops, tablets, game consoles, wearable devices, etc. Furthermore, those skilled in the art will understand that the device body 310 includes the essential structures and components of the electronic device 300. For example, taking a mobile phone as an example, the device body 310 may also include structures and components commonly found in mobile phones, such as a CPU, camera module, fingerprint module, battery, and electroacoustic module, which will not be described in detail here. The CPU, camera module, fingerprint module, battery, electroacoustic module, and other structures and components can be accommodated within an accommodating space.

[0119] The housing 200 includes a back panel 201 and a frame 202. The back panel 201 can be integrally formed with the frame 202, or it can be separately set with the frame 202 and detachably connected by means of snap-fit, screws or other means. No specific restrictions are made here.

[0120] The housing 200 of this application will be described in further detail below through specific embodiments.

[0121] Example 1: The housing includes a substrate and a coating. The first and second sides of the substrate have different lengths. An oxide layer is provided on the surface of the substrate. A coating is formed on the surface of the oxide layer of the substrate by the coating mechanism in any of the above embodiments. From the coating to the surface of the substrate, the coating includes a surface plating layer, a first first plating layer, a first second plating layer, a second first plating layer, a second second plating layer, a third first plating layer, and an undercoat. The surface plating layer, the first first plating layer, the first second plating layer, the second first plating layer, the second second plating layer, the third first plating layer, and the undercoat are respectively silicon-nitrogen chromium, chromium nitride, silicon-nitrogen chromium, chromium nitride, silicon-nitrogen chromium, chromium nitride, and elemental chromium. In the coating mechanism, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.15, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.15.

[0122] Example 2: The difference between Example 2 and Example 1 is the ratio of the length of the major axis to the length of the minor axis. In Example 2, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.2, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.2.

[0123] Example 3: The difference between Example 3 and Example 1 is the ratio of the length of the major axis to the length of the minor axis. In Example 3, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.25, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.25.

[0124] Example 4: The difference between Example 4 and Example 1 is the ratio of the length of the major axis to the length of the minor axis. In Example 4, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.3, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.3.

[0125] Example 5: The difference between Example 5 and Example 1 is the ratio of the length of the major axis to the length of the minor axis. In Example 5, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.4, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.4.

[0126] Example 6: The difference between Example 6 and Example 1 is the ratio of the length of the major axis to the length of the minor axis. In Example 6, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.5, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.5.

[0127] Example 7: The difference between Example 7 and Example 1 is that, from the surface of the coating to the substrate, the surface plating of the coating, the first first plating, the first second plating, the second first plating, the second second plating, and the third first plating all include vanadium, and the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1.25, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.25.

[0128] Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that in the coating mechanism of Comparative Example 1, the first elliptical gear is a circular gear and the second elliptical gear is a circular gear. That is, the ratio of the length of the major axis to the length of the minor axis of the first elliptical gear is 1, and the ratio of the length of the major axis to the length of the minor axis of the second elliptical gear is 1.

[0129] Product performance testing experiments were conducted on the housings provided in the above comparative examples and embodiments. The product performance testing experiments included:

[0130] The coating thickness of the shell was measured using a scanning electron microscope (SEM). Specifically, the shell was cut along a direction parallel to the first side surface, creating three first slices; and the shell was cut along a direction parallel to the second side surface, creating three second slices. Five locations were selected from each first slice for coating thickness testing, and a first average value was recorded. Five locations were selected from each second slice for coating thickness testing, and a second average value was recorded. The difference between the first average value and the second average value represents the difference in thickness between the first and second sides of the shell.

[0131] The LAB color values ​​on the surface of the housing were measured using a colorimeter. Specifically, six positions were taken on the first and second sides respectively to measure the LAB color values. The average first color value L3, the average second color value a3, and the average third color value b3 were calculated for the six positions on the first side; the average first color value L4, the average second color value a4, and the average third color value b4 were calculated for the six positions on the second side. The first average color value difference is equal to the absolute value of the difference between L3 and L4, the second average color value difference is equal to the absolute value of the difference between a3 and a4, and the third average color value difference is equal to the absolute value of the difference between b3 and b4.

[0132] The casing is subjected to a steel wool abrasion resistance test. Specifically, the steel wool abrasion resistance testing equipment includes an abrasion tester; weights (1000gf for fingerprint-resistant parts, and 500gf for plastic painted parts and coated parts); steel wool: No. 0000 steel wool (20mm*20mm area, loosened thickness 10mm±2.5mm); pressure head fixture (pressure head size: 10*10mm); test sample: the test sample can be cut from the casing, with a size not less than 40*20mm.

[0133] Test Method: Step 1: Assemble the indenter onto the abrasion tester bracket, ensuring two opposite edges of the indenter are parallel to the direction of movement. Add weights to counterweight the indenter, ensuring the downward force on the indenter surface meets the counterweight requirements. Step 2: Fix the test sample onto the fixture, positioning the test surface directly beneath the indenter. Step 3: Place a suitably sized piece of steel wool directly beneath the indenter, ensuring most of the steel wool's grain direction is perpendicular to the machine's movement direction and acts on the test sample surface. Step 5: Set the abrasion tester parameters: the required number of pre-grinding cycles in the non-test area before the steel wool test (one round trip counts as one cycle). Unidirectional displacement: 30mm; Speed: 40 cycles / min.

[0134] Acceptance criteria for steel wool abrasion resistance test: After the test, the product's surface coating should show no obvious scratches or discoloration.

[0135] The shell was tested for resistance to artificial sweat. Specifically, the first step was to prepare artificial sweat, which consisted of 2.5g NaCl, 2.19g NH4Cl, 0.63g urea, 1.88g lactic acid, 0.32g acetic acid, and 125ml purified water. The second step was to adjust the pH value. A pH of 4.7 using sodium hydroxide resulted in acidic sweat; a pH of 9.5 using sodium hydroxide resulted in alkaline sweat. The testing steps were as follows: First, clean and dry the work surface, and place a clean glass plate on the test surface. Second, place a 12-inch lint-free cloth in a beaker, and use a graduated cylinder to measure 16ml of the prepared acidic sweat solution, evenly dripping it onto the lint-free cloth. Then, remove the lint-free cloth and lay it flat on the glass plate. Third, place the test sample on the lint-free cloth. Fourth, wrap the test sample with the lint-free cloth. Fifth, fold the excess lint-free cloth over the test sample. Step 6: Horizontally transfer the wrapped test samples into a No. 8 PE sealed bag. Step 7: Clean the test table and glass plate. Step 8: Replace the test sweat with alkaline sweat and repeat the above steps. Step 9: Continue wrapping all sweat test samples, ensuring the PE bags for alkaline sweat samples are separate from those for acidic sweat samples. Step 10: Place all test samples in a 55°C, 95% relative humidity test chamber and store for 48 hours.

[0136] Remove the test sample, dry it in a 55℃ dry environment for 2 hours, and then allow it to recover at room temperature for 2 hours. Inspect the front and back of the sample for any abnormalities such as peeling, missing areas, wrinkles, shrinkage, impurities, scratches, or wear. Repeat steps two through nine for samples that pass the test, replacing the sweat and lint-free cloth each time, and continue maintaining the sample in a 55℃, 95% relative humidity chamber for 72 hours. Remove the test sample, dry it in a 55℃ dry environment for 2 hours, and then allow it to recover at room temperature for 2 hours. Inspect the front and back of the sample for any abnormalities such as peeling, missing areas, wrinkles, shrinkage, impurities, scratches, or wear.

[0137] The table below summarizes the results of SEM measurements of the coating thickness of the housings on the test samples provided in the comparative examples and various embodiments:

[0138] As can be seen from the table above, in the shell provided in this application embodiment, the thickness difference between the first side and the second side is less than or equal to 46.37 nm, and the coating thickness of the shell has good uniformity.

[0139] The table below summarizes the results of measuring the LAB color values ​​using a colorimeter on the test samples provided in the comparative examples and various embodiments:

[0140] As can be seen from the table above, in the shell provided in this application embodiment, the color difference between the first side and the second side is small, and the color consistency of the shell surface is strong.

[0141] The table below summarizes the results of the steel wool abrasion resistance test on the test samples provided in the comparative examples and various embodiments:

[0142] As can be seen from the table above, the steel wool in the housing provided in this application embodiment has a wear resistance of up to 20,000 cycles, indicating good wear resistance.

[0143] The table below summarizes the results of the artificial sweat resistance test on the test samples provided in the comparative examples and various embodiments:

[0144] As can be seen from the table above, the shell provided in the embodiments of this application has good corrosion resistance and strong anti-aging properties.

[0145] The above description is an exemplary embodiment of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A housing (200) characterized by, The shell (200) comprises: a substrate (220); and a coating layer (100) disposed on a surface of the substrate (220), a difference between thicknesses of the coating layer (100) on any two adjacent sides of the substrate (220) is less than or equal to a preset threshold value.

2. The housing (200) according to claim 1, characterized in that The preset threshold value is less than or equal to 50 nm.

3. The housing (200) according to claim 1 or 2, characterized in that Color differences of the coating layer (100) on any two adjacent sides of the substrate (220) satisfy: ΔL < 5, Δa < 3, and Δb < 3.

4. The housing (200) according to any one of claims 1-3, characterized in that, The coating layer (100) comprises a primer layer (110), an intermediate plating layer (120), and a surface plating layer (130) disposed in sequence, the primer layer (110) is disposed between the substrate (220) and the intermediate plating layer (120).

5. The housing (200) according to claim 4, characterized in that The surface plating layer (130) contains at least one of nitrided chromium, titanium nitride, chromium nitride, tungsten carbide, and carbon-nitrogen-silicon-chromium, and the thickness of the surface plating layer (130) is between 200 nm ± 20 nm.

6. The housing (200) of claim 5, characterized by The surface plating layer (130) further contains vanadium elements.

7. The housing (200) of claim 4, characterized by The intermediate plating layer (120) contains at least one of chromium nitride and silicon-chromium-nitride.

8. The housing (200) according to any one of claims 4-7, characterized in that, The intermediate plating layer (120) comprises a first plating layer (121) and a second plating layer (122) disposed in sequence, at least one of the first plating layer (121) and the second plating layer (122) contains vanadium elements, the thickness of the first plating layer (121) is between 200 nm ± 20 nm, and the thickness of the second plating layer (122) is between 200 nm ± 20 nm.

9. The housing (200) according to any one of claims 4-7, characterized in that, The intermediate plating layer (120) comprises a plurality of first plating layers (121) and a plurality of second plating layers (122), the plurality of first plating layers (121) and the plurality of second plating layers (122) are alternately disposed in sequence, at least one of the plurality of first plating layers (121) and the plurality of second plating layers (122) contains vanadium elements, the thickness of the first plating layer (121) is between 200 nm ± 20 nm, and the thickness of the second plating layer (122) is between 200 nm ± 20 nm.

10. The housing (200) of claim 9, characterized by Among the plurality of first plating layers (121), one of the first plating layers (121) is disposed between the primer layer (110) and the second plating layer (122), and another of the first plating layers (121) is disposed between the surface plating layer (130) and the second plating layer (122).

11. The housing (200) according to claim 9 or 10, characterized in that The first plating layer (121) contains chromium nitride, and the second plating layer (122) contains silicon-chromium-nitride.

12. The housing (200) according to any one of claims 4-11, characterized in that, The primer layer (110) contains elemental chromium, and the thickness of the primer layer (110) is between 300 nm ± 30 nm.

13. The housing (200) according to any one of claims 1-12, characterized in that, The substrate (220) is made of metal.

14. The housing (200) according to any one of claims 1-13, characterized in that, An oxidation layer (210) is further disposed between the substrate (220) and the coating layer (100), and the thickness of the oxidation layer (210) is between 10,000 nm ± 3,000 nm.

15. A coating mechanism (400), characterized by, The plating mechanism (400) is used to form a coating layer (100) on a surface of a substrate (220), and the plating mechanism (400) comprises: A particle source (410) is arranged to be spaced apart from the substrate (220), the substrate (220) comprises a first side (221) and a second side (222) adjacent to each other, the particle source (410) is configured to sputter film layer particles to the first side (221) and the second side (222); A first rotating shaft (420) is connected to the substrate (220); and A driving assembly (430) is connected to the first rotating shaft (420), the driving assembly (430) is configured to drive the first rotating shaft (420) to rotate at different speeds, and the first rotating shaft (420) is configured to drive the substrate (220) to rotate at different speeds, so as to reduce the difference between the coating thickness of the first side (221) and the coating thickness of the second side (222).

16. The coating mechanism (400) of claim 15, wherein, The substrate (220) comprises a first state and a second state, in the first state, the first side (221) faces the particle source (410), and the first side (221) and the particle source (410) have a first distance; in the second state, the second side (222) faces the particle source (410), and the second side (222) and the particle source (410) have a second distance, wherein the first distance is less than the second distance; During the switching from the first state to the second state, the rotation speed of the substrate (220) gradually decreases; during the switching from the second state to the first state, the rotation speed of the substrate (220) gradually increases.

17. The coating mechanism (400) of claim 16, wherein, The driving assembly (430) comprises a driving member (431), a first elliptical gear (432) and a second elliptical gear (433), the output end of the driving member (431) is connected to the first elliptical gear (432), the first elliptical gear (432) and the second elliptical gear (433) are meshed, the second elliptical gear (433) is connected to the first rotating shaft (420), and the axis of the second elliptical gear (433) is collinear with the axis of the first rotating shaft (420); The driving member (431) drives the first elliptical gear (432) to rotate, the first elliptical gear (432) drives the second elliptical gear (433) to rotate, and the second elliptical gear (433) drives the first rotating shaft (420) to rotate.

18. The coating mechanism (400) of claim 17, wherein, In the first state, the long axis of the first elliptical gear (432) corresponds to the tooth part which is meshed with the short axis of the second elliptical gear (433); in the second state, the short axis of the first elliptical gear (432) corresponds to the tooth part which is meshed with the long axis of the second elliptical gear (433).

19. The coating mechanism (400) according to claim 17 or 18, characterized in that, The driving member (431) comprises a driving motor (4311), a driving gear (4312) and a second rotating shaft (4313); the output end of the driving motor (4311) is connected with the driving gear (4312), the driving gear (4312) is connected with the second rotating shaft (4313), the first elliptical gear (432) is connected with the second rotating shaft (4313), and the axis of the first elliptical gear (432) is collinear with the axis of the second rotating shaft (4313); The driving motor (4311) drives the driving gear (4312) to rotate, the driving gear (4312) drives the second rotating shaft (4313) to rotate, and the second rotating shaft (4313) drives the first elliptical gear (432) to rotate.

20. The coating mechanism (400) of claim 19, wherein, The driving gear (4312) comprises a first auxiliary gear (4314) and a second auxiliary gear (4315); the driving motor (4311) is connected with the first auxiliary gear (4314), the first auxiliary gear (4314) is connected with the second auxiliary gear (4315) in a meshing mode, the second auxiliary gear (4315) is connected with the second rotating shaft (4313), and the axis of the second auxiliary gear (4315) is collinear with the axis of the second rotating shaft (4313); The driving motor (4311) drives the first auxiliary gear (4314) to rotate, the first auxiliary gear (4314) drives the second auxiliary gear (4315) to rotate, and the second auxiliary gear (4315) drives the second rotating shaft (4313) to rotate.

21. A method of making a case, comprising: The manufacturing method comprises: disposing a coating on the side surface of a substrate, and making the difference between the thicknesses of the coating on any two adjacent side surfaces of the substrate less than or equal to a preset threshold value, to obtain the shell.

22. The method of making a housing according to claim 21, wherein, The disposing of the coating on the side surface of the substrate specifically comprises: plating a base layer (601) on the surface of the substrate; plating an intermediate plating layer (602) on the surface of the base layer away from the substrate; plating a surface plating layer (603) on the surface of the intermediate plating layer away from the substrate.

23. The method of making a case of claim 22, wherein, The material of the substrate comprises metal; before the plating of the base layer on the surface of the substrate, the manufacturing method further comprises: performing an oxidation treatment on the substrate to form an oxidation layer on the surface of the substrate.

24. An electronic device (300), characterized by The electronic device (300) comprises: a device body (310); and The shell (200) according to any one of claims 1-14, wherein the device body (310) is accommodated in the shell (200).

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