Shell structure and preparation method thereof, and electronic equipment

Abstract

The embodiments of the present application provide a shell structure and a preparation method thereof, and an electronic device, and relate to the technical field of electronic devices. The shell structure includes: a substrate, including a first surface and a second surface relative to each other, a plurality of protrusions of M rows and N columns are formed on the first surface, wherein M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1, and the first surface includes at least one functional area; a functional layer, located on the side of the first surface away from the second surface, and arranged on the functional area of ​​the first surface. Since the plurality of protrusions arranged in an array form a super-hydrophilic surface structure, a better hydrophobic effect can be obtained when a hydrophobic treatment is performed on the super-hydrophilic surface structure, and a better hydrophilic effect can be obtained when a hydrophilic treatment is performed on the super-hydrophilic surface structure.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a housing structure and a preparation method thereof, and an electronic device. Background Art

[0002] With the rapid development of terminals such as smart phones and tablet computers, various terminal shells have emerged. For example, terminal shells include glass shells, plastic shells, metal shells, ceramic shells, and shells composed of metal, glass, fiberglass board, composite board, injection molded parts and other base materials and plain leather.

[0003] During daily use of electronic products such as smartphones and tablets, the surfaces of glass, plastic, and metal shells are easily sticky with fingerprints, sebum, and other dirt from users; shells composed of base materials such as metal, glass, fiberglass boards, composite panels, injection molded parts, and plain leather may have the problem of base materials and plain leather peeling off. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a housing structure and a preparation method thereof, and an electronic device, which can solve the problem that the surfaces of existing glass housings, plastic housings, metal housings, etc. are easily adhered to the user's fingerprints, sebum and other dirt, and the housing composed of metal, glass, fiberglass board, composite board, injection molding and other substrates and plain leather is spliced, and the substrate and plain leather are peeled off.

[0005] In a first aspect, an embodiment of the present application provides a shell structure, which includes: a substrate and a functional layer, the substrate includes a first surface and a second surface relative to each other, a plurality of protrusions in M ​​rows and N columns are formed on the first surface, wherein M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1, and the first surface includes at least one functional area; the functional layer is located on a side of the first surface away from the second surface, and is arranged on the functional area of ​​the first surface.

[0006] Since the multiple protrusions evenly arranged on the first surface form a super-hydrophilic surface structure, when hydrophobic treatment is performed on the super-hydrophilic surface structure, a better hydrophobic effect (static contact angle above 130°) can be obtained to reduce the degree of oil contamination. In addition, when hydrophilic treatment is performed on the super-hydrophilic surface structure, a better hydrophilic effect (static contact angle below 20°) can be obtained to improve the bonding strength between the second functional layer and the first surface.

[0007] For example, the functional layer can be a hydrophobic layer, a plain leather, or a portion of the hydrophobic layer and a portion of the plain leather to form a spliced ​​shell structure. Of course, the functional layer is not limited to the above examples, and those skilled in the art can set the functional layer according to actual conditions.

[0008] According to the first aspect, the first surface includes a first functional area and a second functional area, and the functional layer includes a first functional layer and a second functional layer; the first functional layer is arranged on the first functional area of ​​the first surface, and the second functional layer is arranged on the second functional area of ​​the first surface.

[0009] Such an arrangement can meet different housing structure requirements, making the application range of the housing structure wider.

[0010] Of course, the first surface may also include more functional areas, and then more functional layers may be arranged on more functional areas to meet different housing structure requirements.

[0011] According to the first aspect, or any implementation of the first aspect, the first functional layer includes a hydrophobic layer.

[0012] Since the multiple protrusions evenly arranged on the first surface form a super-hydrophilic surface structure, the hydrophobic layer provided on the structure has a better hydrophobic effect (static contact angle of more than 130°), which can reduce the degree of oil contamination.

[0013] According to the first aspect, or any implementation of the first aspect above, the material of the hydrophobic layer includes perfluoropolyether or silane-based substances.

[0014] Of course, the material of the hydrophobic layer is not limited to perfluoropolyether or silane substances, and those skilled in the art can select the material of the hydrophobic layer according to actual conditions.

[0015] According to the first aspect, or any implementation of the first aspect, the second functional layer includes a plain leather.

[0016] Since the multiple protrusions evenly arranged on the first surface form a super-hydrophilic surface structure, the bonding strength between the plain leather and the first surface can be improved, thereby avoiding the problem of peeling between the plain leather and the substrate.

[0017] According to the first aspect, or any implementation of the first aspect, the shape of the protrusion includes a cuboid, a prism, a cone or a cylinder.

[0018] Of course, the shape of the protrusion is not limited to a cuboid, a prism, a pyramid or a cylinder, and those skilled in the art can set the shape of the protrusion according to actual conditions.

[0019] When the shape of the protrusion is a prism, the wear resistance of the shell structure can be improved.

[0020] According to the first aspect, or any implementation of the first aspect above, when the shape of the protrusion includes a rectangular parallelepiped or a prism, the side length of the protrusion and the distance between two adjacent protrusions satisfy: 0.9≤H1 / H2≤1.1; wherein H1 is the side length of the protrusion, and H2 is the distance between two adjacent protrusions.

[0021] This arrangement can avoid the problem that when H1 / H2 is too large, the wear resistance of the shell structure is poor, and when H1 / H2 is too small, the hydrophobic effect is poor.

[0022] Exemplarily, H1 / H2 is equal to 1, 0.9 or 1.1, etc.

[0023] According to the first aspect, or any implementation of the first aspect, 2 μm≤H1≤50 μm, 2 μm≤H2≤50 μm, and 2 μm≤H3≤50 μm, wherein H3 is the height of the protrusion.

[0024] This arrangement can avoid the problem that when H1, H2 and / or H3 are too large, the wear resistance of the shell structure is poor, and when H1, H2 and / or H3 are too small, the hydrophobic effect is poor.

[0025] Exemplarily, H1 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm.

[0026] Exemplarily, H2 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm.

[0027] Exemplarily, H3 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm.

[0028] H1, H2 and H3 may be the same or different, or any two of them may be the same.

[0029] According to the first aspect, or any implementation of the first aspect above, the substrate includes metal, glass, fiberglass board, composite board or injection molded part.

[0030] Of course, the material of the substrate is not limited to metal, glass, fiberglass board, composite board or injection molded parts, and those skilled in the art can select the material of the substrate according to actual conditions.

[0031] According to the first aspect, or any implementation of the first aspect, the static contact angle of the first surface of the substrate is less than or equal to 20°.

[0032] It is understandable that when the heights of the protrusions are different, different static contact angles can be obtained. Therefore, the height of the protrusions can be set according to the requirements for the static contact angle of the first surface of the substrate.

[0033] According to the first aspect, or any implementation of the first aspect above, the functional layer is a hydrophobic layer, and the static contact angle of the hydrophobic layer is greater than or equal to 130°. That is, the shell structure provided in the present application can achieve a better hydrophobic effect.

[0034] In a second aspect, an embodiment of the present application provides an electronic device, which includes the housing structure according to the first aspect and any one of the first aspects.

[0035] The second aspect and any implementation of the second aspect correspond to the first aspect and any implementation of the first aspect respectively. The technical effects corresponding to the second aspect and any implementation of the second aspect can refer to the technical effects corresponding to the above-mentioned first aspect and any implementation of the first aspect, which will not be repeated here.

[0036] In a third aspect, an embodiment of the present application provides a method for preparing a shell structure. The method for preparing a shell structure provided in an embodiment of the present application is used to prepare the shell structure as described in the first aspect;

[0037] The method for preparing the shell structure includes: providing a substrate, the substrate including a first surface and a second surface relative to each other; using a femtosecond laser to perform laser engraving on the first surface to form a plurality of raised portions in M ​​rows and N columns, wherein M is a positive integer greater than or equal to 1, N is a positive integer greater than or equal to 1, and the first surface includes at least one functional area; and setting a functional layer on the functional area of ​​the first surface.

[0038] The third aspect and any implementation of the third aspect correspond to the first aspect and any implementation of the first aspect, respectively. The technical effects corresponding to the third aspect and any implementation of the third aspect can refer to the technical effects corresponding to the first aspect and any implementation of the first aspect, which will not be repeated here.

[0039] According to the third aspect, the first surface includes a first functional area and a second functional area; and a functional layer is provided on the functional area of ​​the first surface, comprising: providing the first functional layer on the first functional area of ​​the first surface; and providing the second functional layer on the second functional area of ​​the first surface.

[0040] According to the third aspect, or any implementation of the third aspect above, the first functional layer includes a hydrophobic layer; the first functional layer is set on the first functional area of ​​the first surface, including: using perfluoropolyether or silane to immerse or deposit on the first functional area of ​​the first surface to form a hydrophobic layer on the first functional area of ​​the first surface.

[0041] According to the third aspect, or any implementation of the third aspect above, the second functional layer includes a plain leather; the second functional layer is set on the second functional area of ​​the first surface, including: using a hydrophilic surface chemical modifier to treat the second functional area of ​​the first surface; and setting the plain leather on the second functional area of ​​the first surface by an adhesive.

[0042] The present application limits the specific materials of the hydrophilic surface chemical modifier, and those skilled in the art can select them according to actual conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0044] Figure 2 An exploded schematic diagram of an electronic device provided in an embodiment of the present application;

[0045] Figure 3a-3d It is a schematic diagram of the back structure of the electronic device when it has different housing structures;

[0046] Figure 4 A membrane layer diagram of a shell structure provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the structure of a substrate provided in an embodiment of the present application;

[0048] Figure 6 A partial stereoscopic view of the first surface provided in an embodiment of the present application;

[0049] Figure 7 This is a characterization diagram of the substrate provided in the embodiment of the present application having super-hydrophilicity after being etched by femtosecond laser;

[0050] Figure 8 A membrane layer diagram of another shell structure provided in an embodiment of the present application;

[0051] Fig. 9 A schematic diagram of the front structure of another substrate provided in an embodiment of the present application;

[0052] Fig.10 A schematic diagram of the front structure of another substrate provided in an embodiment of the present application;

[0053] Fig.11 A schematic diagram of the front structure of another substrate provided in an embodiment of the present application;

[0054] Fig.12 A schematic diagram of a three-dimensional structure of a protrusion provided in an embodiment of the present application;

[0055] Fig.13A flow chart of a method for preparing a shell structure provided in an embodiment of the present application;

[0056] Fig.14 A typical surface morphology and size diagram of the first surface after femtosecond laser engraving provided in an embodiment of the present application;

[0057] Figure 15-18 A topographical image of a plurality of protrusions at different heights formed in M ​​rows and N columns on the first surface of the substrate provided in an embodiment of the present application by a femtosecond laser engraving process;

[0058] Fig.19 The present invention provides a trend diagram of the surface roughness and static contact angle of the first surface of the protrusion at different heights and the static contact angle of the first surface after AF coating after femtosecond laser treatment. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0061] The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects rather than to describe a specific order of objects. For example, a first target object and a second target object are used to distinguish different target objects rather than to describe a specific order of target objects.

[0062] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0063] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more than two. For example, multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.

[0064] The embodiment of the present application provides an electronic device, which may be a mobile phone, a laptop computer, a tablet computer, a personal digital assistant (PDA), a smart wearable device (such as a smart watch, a smart bracelet, a smart head-mounted display, smart glasses), etc. The embodiment of the present application does not specifically limit the specific form of the above electronic device. For the convenience of explanation, the following description takes the electronic device as an example.

[0065] See also Figure 1 , Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application, wherein: Figure 1 (1) is a schematic diagram of the front structure of an electronic device. Figure 1 (2) is a schematic diagram of the back structure of an electronic device. Figure 1 As shown, the mobile phone 100 includes a shell structure (when the electronic device is a mobile phone, tablet computer, etc., it can also be called a battery cover or a back cover, etc.; when the electronic device is a laptop computer, smart watch, etc., it can also be called a structural member or a shell, etc.) 10, a display panel 20, and a middle frame 30 between the shell structure 10 and the display panel 20.

[0066] Figure 1 In the embodiment, the mobile phone 100 is in a rectangular flat plate shape. In other optional embodiments of the present application, the shape of the electronic device can also be a square flat plate shape, a circular flat plate shape, an elliptical flat plate shape, etc. Of course, the electronic device can also be a foldable electronic device, etc.

[0067] See also Figure 2 , Figure 2 The following is a schematic diagram of an explosion of an electronic device provided in an embodiment of the present application. Figure 2 As shown, the housing structure 10, the display panel 20 and the middle frame 30 can enclose a housing cavity. The housing cavity is provided with structures such as a printed circuit board (PCB) 40, a battery 50 and a functional device 60. In an embodiment of the present application, the PCB 40 includes a main board 41 and a sub-board 42, and the functional device 60 includes, for example, a flash 61, a rear camera 62, etc. The rear camera 62 can be electrically connected to the main board 41 through an FPC 70. The number of rear cameras 62 can be one or more. When the number of rear cameras 62 is multiple, the functions of the multiple rear cameras 62 may be different. For example, in one possible implementation method, one of the rear cameras 62 is responsible for the main camera, one of the rear cameras 62 is responsible for zooming, and one of the rear cameras 62 is responsible for wide angle, etc.

[0068] The mobile phone 100 further includes a camera decoration piece 80 for decorating the camera. A decoration hole 11 is opened on the shell structure 10 . The camera decoration piece 80 is arranged at the decoration hole 11 , and the rear camera 62 is opposite to the decoration piece body 80 .

[0069] The shell structure 10 may include a glass shell, a plastic shell, a metal shell, etc.; it may also include a shell composed of a base material such as metal, glass, fiberglass board, composite board, injection molding, etc. and a plain leather, or a shell composed of four materials, metal, glass, plain leather, and composite board.

[0070] For example, see Figure 3a-3d ,in, Figure 3a-3d Schematic diagram of the back structure of the electronic device when it has different housing structures. Figure 3a-3c As shown, the shell structure 10d is a shell structure composed of glass and plain leather, wherein area ① is glass and area ② is plain leather. When the shell structure 10d is a shell structure composed of glass and plain leather, the glass can be used as a substrate, and then the plain leather is bonded to the glass substrate and the corresponding area ②. Figure 3d As shown, the shell structure 10d is a shell structure composed of a composite sheet and a metal, wherein area ① is a composite sheet and area ② is a metal. When the shell structure 10d is a shell structure composed of a composite sheet and a metal, the composite sheet can be used as a substrate, and then a metal layer is arranged on the composite sheet substrate and in the corresponding area ②.

[0071] Understandably, Figure 3a-3d In the embodiment, when the shape of the camera decoration 80 changes, the shape of the decoration hole 11 opened on the shell structure 10 will also change accordingly.

[0072] In the daily use of electronic products such as smart phones and tablets, in order to prevent the glass shell, plastic shell, metal shell and other surfaces from being easily adhered to the user's fingerprints, sebum and other dirt, a hydrophobic layer is generally formed by spraying or coating directly on the substrates such as metal, glass, fiberglass board, composite board, injection molded parts, etc. after abrasive grinding (AG) treatment. That is, a super hydrophobic and oleophobic coating is provided on the surface on the side that can be touched by the user to improve the cover's ability to resist dirt.

[0073] In order to arrange the plain leather on a substrate such as metal, glass, fiberglass board, composite board, injection molded part, etc., an adhesive layer is arranged between the plain leather and the substrate.

[0074] However, research has found that after AG treatment, the surface structure is limited and the hydrophobicity is insufficient (water drop angle is less than 115°), and the oil resistance is weak. In addition, the glass / composite board substrate used for bonding the plain leather is weakly hydrophilic, and the bonding force cannot be effectively improved, and the plain leather may peel off.

[0075] Based on this, an embodiment of the present application provides a shell structure, including a substrate and a functional layer, wherein the functional layer is arranged on one side of the substrate, wherein a super-hydrophilic surface structure is formed on the surface of the substrate facing the functional layer, and the super-hydrophilic surface structure is a plurality of raised portions arranged in an array formed by a femtosecond laser laser engraving process. Since the super-hydrophilic surface structure is a plurality of raised portions arranged in an array, when a hydrophobic treatment is performed on the super-hydrophilic surface structure, a better hydrophobic effect (static contact angle of more than 130°) can be obtained, the degree of oil contamination is reduced, and, when a hydrophilic treatment is performed on the super-hydrophilic surface structure, a better hydrophilic effect (static contact angle of less than 20°) can be obtained to improve the bonding strength.

[0076] The specific structure of the housing structure and its preparation process are described in detail below in conjunction with the electronic device.

[0077] First, the specific structure of the housing structure will be described.

[0078] See also Figure 4 , Figure 5 and Figure 6 , Figure 4 A membrane layer diagram of a shell structure provided in an embodiment of the present application, Figure 5 A schematic diagram of the structure of a substrate provided in an embodiment of the present application, Figure 6 A partial stereoscopic view of the first surface provided in an embodiment of the present application, wherein: Figure 5 (1) is a schematic diagram of the front structure of the substrate. Figure 5 (2) Figure 5 (1) Cross-section along the AA' direction. Figure 4 , Figure 5 and Figure 6 As shown, the shell structure 10 includes a substrate 101, and the substrate 101 includes a metal substrate, a glass substrate, a glass fiber board substrate, a composite board substrate, an injection molded part substrate, etc. The embodiment of the present application does not limit the specific material of the substrate 101. The substrate 101 includes a first surface 1011 and a second surface 1012 opposite to each other. When the first surface 1011 is laser engraved by a femtosecond laser, a plurality of protrusions 10111 evenly distributed in M ​​rows and N columns can be formed on the first surface 1011, wherein M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1.

[0079] From the foregoing content, it can be known that the shell structure 10 can be a single shell structure such as a glass shell, a plastic shell or a metal shell, or it can be a shell composed of a base material such as metal, glass, fiberglass board, composite board, injection molding and a plain leather, or it can be a shell composed of four materials, namely metal, glass, plain leather and composite board, which are spliced ​​together.

[0080] Therefore, continue to see Figure 4 , Figure 5 and Figure 6 When the shell structure 10 is a shell composed of a base material such as metal, glass, glass fiber board, composite board, injection molding and plain leather, or when the shell structure 10 is a shell composed of four materials such as metal, glass, plain leather and composite board, the first surface 1011 may include a first functional area 1011a and a second functional area 1012b. A first functional layer 1021 is provided on the first functional area 1011a of the first surface 1011, wherein the first functional layer 1021 may be a hydrophobic layer 1021; a second functional layer 1022 is provided on the second functional area 1012b of the first surface 1011, wherein the second functional layer 1022 may be plain leather, for example, the plain leather may be provided on the second functional area 1012b of the first surface 1011 by adhesive.

[0081] Exemplarily, when the first functional layer 1021 is a hydrophobic layer 1021, for example, a substance such as perfluoropolyether or silane can be used for immersion baking or deposition to form the hydrophobic layer 1021 on the first functional region 1011a of the first surface 1011. Since a plurality of evenly arranged and relatively large number of protrusions 10111 are provided on the first surface 1011, when a hydrophobic substance such as perfluoropolyether or silane is provided on the first functional region 1011a of the first surface 1011, the surface area carrying the substance such as perfluoropolyether or silane increases, so that the area of ​​the substance such as perfluoropolyether or silane increases and is evenly distributed, that is, more substances such as perfluoropolyether or silane can be laid on a larger bearing surface, and the substances such as perfluoropolyether or silane are evenly distributed. Thus, compared to the hydrophobic layer formed after the AG process, since the structure on the surface treated by the AG process is a random structure, when the hydrophobic substances such as perfluoropolyether or silane are set, the hydrophobic substances such as perfluoropolyether or silane are unevenly distributed, so that the hydrophobicity of the hydrophobic layer formed here is insufficient (water drop angle is less than 115°). In the embodiment of the present application, the hydrophobic layer formed on the multiple uniformly arranged protrusions 10111 can obtain a higher water drop angle, for example, the water drop angle can be increased from 115° to 140°, the hydrophobic effect is better, and even super hydrophobicity is achieved, reducing the degree of oil contamination.

[0082] For example, when the second functional layer 1022 is a plain leather, since the first surface 1011 forms a super-hydrophilic surface structure by a femtosecond laser laser engraving process, the static contact angle of the surface of the substrate 101 should be less than 20° (e.g. Figure 7 As shown), therefore, when an adhesive such as acrylic pressure-sensitive adhesive or hot-melt adhesive film is used to bond the plain leather to the substrate 101, the bonding strength can be increased to avoid the problem of the substrate 101 and the plain leather peeling off when the bonding force between the substrate 101 and the plain leather is insufficient.

[0083] That is to say, in the embodiment of the present application, the shell structure 10 formed by splicing can not only improve the adhesion between the substrate and the plain leather, but also reduce the degree of oil contamination.

[0084] When the housing structure 10 is a single housing structure such as a glass housing, a plastic housing or a metal housing, see Figure 8 , Figure 8 This is another membrane layer diagram of a shell structure provided in an embodiment of the present application. Figure 8 As shown, a third functional layer 1023 is disposed on the entire area of ​​the first surface 1011 , wherein the third functional layer 1023 may be a hydrophobic layer or a plain leather.

[0085] Exemplarily, when the third functional layer 1023 is a hydrophobic layer, for example, a substance such as perfluoropolyether or silane can be used for dipping or deposition to form a hydrophobic layer on the first surface 1011. Since a plurality of evenly arranged and relatively large number of protrusions 10111 are provided on the first surface 1011, when a hydrophobic substance such as perfluoropolyether or silane is provided on the first surface 1011, the surface area for carrying the substance such as perfluoropolyether or silane increases, so that the area for carrying the substance such as perfluoropolyether or silane increases and is evenly distributed, that is, more substances such as perfluoropolyether or silane can be laid on a larger bearing surface, and the distribution of the substances such as perfluoropolyether or silane is even. Thus, compared to the hydrophobic layer formed after the AG process, since the structure on the surface treated by the AG process is a random structure, when the hydrophobic substances such as perfluoropolyether or silane are set, the hydrophobic substances such as perfluoropolyether or silane are unevenly distributed, so that the hydrophobicity of the hydrophobic layer formed here is insufficient (water drop angle is less than 115°). In the embodiment of the present application, the hydrophobic layer formed on the multiple uniformly arranged protrusions 10111 can obtain a higher water drop angle, for example, the water drop angle can be increased from 115° to 140°, the hydrophobic effect is better, and even super hydrophobicity is achieved, reducing the degree of oil contamination.

[0086] Exemplarily, when the third functional layer 1023 is a plain leather, since the first surface 1011 forms a super hydrophilic surface structure through a femtosecond laser engraving process, wherein the static contact angle of the surface of the substrate 101 should be below 20°, therefore, when an adhesive such as an acrylic pressure-sensitive adhesive or a hot-melt adhesive film is used to bond the plain leather to the substrate 101, the bonding strength can be increased to avoid the problem of the substrate 101 and the plain leather peeling off when the bonding force between the substrate 101 and the plain leather is insufficient.

[0087] Regarding the shape of the protrusion 10111, the embodiment of the present application does not limit the shape of the protrusion 10111, and those skilled in the art can set it according to actual conditions.

[0088] In one possible implementation, see Figure 5 and Figure 6, the raised portion 10111 is a prism.

[0089] When the protrusion 10111 is a prism, the wear resistance of the shell structure 10 can be improved.

[0090] It should be noted that Figure 5 and Figure 6 The description is made by taking a quadrangular prism as an example, but it does not constitute a limitation of the present application. In other optional embodiments of the present application, the protrusion 10111 may also be a pentagonal prism (not shown in the figure) or a hexagonal prism (such as Fig. 9 shown) etc.

[0091] In another possible implementation, see Fig.10 , Fig.10 This is a schematic diagram of the front structure of another substrate provided in the embodiment of the present application. Fig.10 As shown, the raised portion 10111 is a rectangular parallelepiped.

[0092] Exemplarily, the first surface 1011 includes a first edge 1011a and a second edge 1011b disposed opposite to each other along a first direction X, and a third edge 1011c and a fourth edge 1011d disposed opposite to each other along a second direction Y. A plurality of protrusions 10111 are arranged from the third edge 1011c to the fourth edge 1011d, and each protrusion 10111 extends from the first edge 1011a to the second edge 1011b, and the first direction X is perpendicular to the second direction Y.

[0093] In another possible implementation, see Fig.11 , Fig.11 This is a schematic diagram of the front structure of another substrate provided in the embodiment of the present application. Fig.11 As shown, the protrusion 10111 is a cylinder.

[0094] In another possible implementation, see Fig.12 , Fig.12 This is a schematic diagram of a three-dimensional structure of a protrusion provided in an embodiment of the present application. Fig.12 As shown, the raised portion 10111 is a cone.

[0095] Regarding the size of the protruding structure 10111, the embodiment of the present application does not limit the size of the protruding portion 10111, and those skilled in the art can set it according to actual conditions.

[0096] In one possible implementation, see Figure 5 , 2μm≤H1≤50μm, 2μm≤H2≤50μm, and 2μm≤H3≤50μm, wherein H1 is the side length of the protrusion 10111 , H2 is the distance between two adjacent protrusions 10111 , and H3 is the height of the protrusion 10111 .

[0097] Exemplarily, H1 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm, etc. H2 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm, etc. H3 is 2 μm, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm, etc.

[0098] This arrangement can avoid the problem that when H1, H2 and / or H3 are too large, the wear resistance of the shell structure is poor, and when H1, H2 and / or H3 are too small, the hydrophobic effect is poor.

[0099] It should be noted that H1, H2 and H3 may all be the same, or all be different, or two of them may be the same, and any relationship may be satisfied between H1, H2 and H3. Exemplarily, when the shape of the raised portion includes a cuboid or a prism, the side length of the raised portion and the distance between two adjacent raised portions satisfy: 0.9≤H1 / H2≤1.1. Exemplarily, H1 / H2 is equal to 1, 0.9 or 1.1, etc.

[0100] It is understandable that the above-mentioned size and shape can be set by setting the parameters used when using femtosecond laser to perform laser engraving on the surface of the substrate to form the desired size and shape.

[0101] The above content introduces the structure of the housing structure 10. Figure 4 The shell structure shown in the figure is used to illustrate the preparation process of the shell structure. Since the preparation method of the shell structure can be used to prepare the above shell structure, it has the same beneficial effects as the shell structure. For details not described in detail in this embodiment, reference can be made to the embodiment of the above shell structure.

[0102] See also Fig.13 , Fig.13 A flowchart of a method for preparing a shell structure provided in an embodiment of the present application is shown in FIG. Fig.13 As shown, the steps of the method for preparing the shell structure provided in the embodiment of the present application specifically include:

[0103] S101 , providing a substrate 101 , wherein the substrate 101 includes a first surface 1011 and a second surface 1012 opposite to each other.

[0104] The substrate 101 includes a metal substrate, a glass substrate, a fiberglass board substrate, a composite board substrate, an injection molded part substrate, etc. The embodiment of the present application does not limit the specific material of the substrate 101.

[0105] S102 , forming a plurality of protrusions 10111 in M ​​rows and N columns on the first surface 1011 of the substrate 101 by a femtosecond laser engraving process, wherein the first surface 1011 may include a first functional area 1011a and a second functional area 1012b .

[0106] A plurality of protrusions 10111 in M ​​rows and N columns are formed on the first surface 1011 of the substrate 101 by femtosecond laser engraving, wherein M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1. The specific values ​​of M and N are not limited in the present embodiment.

[0107] Combination Fig.14 , Fig.14 The typical morphology and size diagram of the first surface after femtosecond laser engraving provided in the embodiment of the present application, wherein: Fig.14 (1) is the morphology diagram, Fig.14 (2) is the dimension drawing. Fig.14 This is only an example and does not constitute a limitation to the present application.

[0108] The first surface 1011 may include different functional regions, such as a first functional region 1011 a and a second functional region 1012 b , so that different functional layers may be formed in different regions.

[0109] It is understandable that the first surface 1011 may not be divided into regions, so that a functional layer may be provided in the entire region of the first surface 1011 .

[0110] S103 , using perfluoropolyether or silane or other substances to perform immersion baking or deposition on the first functional region 1011 a of the first surface 1011 , so as to form a hydrophobic layer 1021 on the first functional region 1011 a of the first surface 1011 .

[0111] Since the first surface 1011 is provided with a plurality of evenly arranged and large number of raised portions 10111, therefore, when a hydrophobic substance such as perfluoropolyether or silane is set on the first functional area 1011a of the first surface 1011, the surface area of ​​the substances such as perfluoropolyether or silane increases, so that the area of ​​the substances such as perfluoropolyether or silane increases, and the distribution is uniform, that is, more substances such as perfluoropolyether or silane can be laid on a larger bearing surface, and the distribution of the substances such as perfluoropolyether or silane is uniform. In this way, compared to the hydrophobic layer formed after the AG process, since the structure on the surface treated by the AG process is a random structure, in this way, the hydrophobicity of the hydrophobic layer formed here is insufficient (water drop angle 115 ° or less). In the embodiment of the present application, the hydrophobic layer formed on the evenly arranged multiple raised portions 10111 can obtain a higher water drop angle, for example, the water drop angle can be increased from 115 ° to 140 °, and the hydrophobic effect is better, even reaching super-hydrophobicity, reducing the degree of oil contamination.

[0112] S104 , setting the plain leather on the second functional area 1012 b of the first surface 1011 by adhesive.

[0113] When the first surface 1011 is provided with a plain leather in the second functional area 1012b, since the first surface 1011 is formed with a super-hydrophilic surface structure by a femtosecond laser laser engraving process, the static contact angle of the surface of the substrate 101 should be less than 20° (e.g. Figure 7 As shown), therefore, when an adhesive such as acrylic pressure-sensitive adhesive or hot-melt adhesive film is used to bond the plain leather to the substrate 101, the bonding strength can be increased to avoid the problem of the substrate 101 and the plain leather peeling off when the bonding force between the substrate 101 and the plain leather is insufficient.

[0114] The shell structure prepared by the above-mentioned shell structure preparation method has the dual characteristics of better hydrophobic effect (static contact angle above 130°), reducing the degree of oil contamination, and obtaining better hydrophilic effect (static contact angle below 20°) when hydrophilic treatment is performed on the super-hydrophilic surface structure to improve the bonding strength.

[0115] The beneficial effects of the housing structure provided by the embodiment of the present application are described below in combination with experiments, wherein the description is made by taking a glass substrate as an example.

[0116] See also Figure 15-19 , Figure 15-18 The topography images of a plurality of protrusions 10111 in M ​​rows and N columns formed on the first surface 1011 of the substrate 101 by a femtosecond laser laser engraving process at different heights are shown respectively, wherein: Fig.15 (1) is a morphology diagram of multiple protrusions 10111 when the protrusion 10111 is 5 μm. Fig.15(2) is a representation diagram of the static contact angle of the first surface 1011 when the protrusion 10111 is 5 μm, Fig.15 (3) is a characterization diagram of the static contact angle of the first surface 1011 after an anti-fingerprint film (AF), i.e., a hydrophobic layer, is provided when the protrusion 10111 is 5 μm; Fig.16 (1) is a morphology diagram of a plurality of protrusions 10111 when the protrusion 10111 is 10 μm. Fig.16 (2) is a representation diagram of the static contact angle of the first surface 1011 when the protrusion 10111 is 10 μm and an anti-fingerprint film (AF) is provided, that is, a hydrophobic layer is provided; Fig.17 (1) is a morphology diagram of multiple protrusions 10111 when the protrusion 10111 is 15 μm. Fig.17 (2) is a representation diagram of the static contact angle of the first surface 1011 when the protrusion 10111 is 15 μm and an anti-fingerprint film (AF) is provided, that is, a hydrophobic layer is provided; Fig.18 (1) is a morphology diagram of multiple protrusions 10111 when the protrusion 10111 is 20 μm. Fig.18 (2) is a characterization diagram of the static contact angle of the first surface 1011 when the protrusion 10111 is 20 μm and an anti-fingerprint film (AF) is provided, that is, a hydrophobic layer is provided. Fig.19 The surface roughness and static contact angle of the first surface 1011 at different heights of the protrusion 10111 are shown, and the trend diagram of the static contact angle of the first surface 1011 after femtosecond laser treatment and AF coating is shown, wherein: Fig.19 The middle horizontal axis is the height of the surface microcolumns (5μm, 10μm, 15μm and 20μm respectively), the left vertical axis represents the water drop angle in degrees, and the right vertical axis represents the roughness in μm. Fig.19 The bar graph on the left in the middle represents the static contact angle of the first surface 1011 after femtosecond laser treatment, and the bar graph on the right represents the static contact angle after AF coating.

[0117] Depend on Figure 15-19It can be seen that when the height of the raised portion 10111 is increased from 5μm to 20μm, when the depth of the laser-engraved micro-column is 5μm, the surface roughness of the first surface 1011 is 1.59μm, and the static contact angle is 4°; when the height of the raised portion 10111 is increased to 10μm, the surface roughness of the first surface 1011 can be increased to 3.15μm, and the static contact angle is reduced to 1°. When the height of the raised portion 10111 is increased to 15μm, the surface roughness of the first surface 1011 can be increased to 3.68μm, and the static contact angle is reduced to 1°. When the height of the raised portion 10111 is increased to 20μm, the surface roughness of the first surface 1011 can be increased to 4.23μm, and the static contact angle is reduced to 0°. After AF coating is performed on the first surface 1011 after femtosecond laser treatment, as the height of the protrusion 10111 increases, the maximum static water contact angle can increase from 130° to 140° (136°, 134°, 139° and 140° respectively), that is, as the height of the protrusion 10111 increases, the roughness shows a downward trend, the water contact angle of the first surface 1011 after laser engraving shows a downward trend, and the static contact angle after AF coating shows an upward trend.

[0118] It can be concluded that the shell structure provided in the embodiment of the present application has a better hydrophobic effect (static contact angle above 130°), which reduces the degree of oil contamination, and when hydrophilic treatment is performed on the super hydrophilic surface structure, a better hydrophilic effect (static contact angle below 20°) can be obtained to improve the bonding strength.

[0119] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A housing structure, characterized in that: include: A substrate, comprising a first surface and a second surface opposite to each other, wherein a plurality of protrusions in M ​​rows and N columns are formed on the first surface, wherein the protrusions are cones, M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1; 2 μm ≤ H1 ≤ 50 μm, 30 μm ≤ H2 ≤ 50 μm, and 20 μm ≤ H3 ≤ 50 μm, H1 is the side length of the protrusion, H2 is the distance between two adjacent protrusions, and H3 is the height of the protrusion, so that the first surface forms a super-hydrophilic surface structure; a functional layer, located on a side of the first surface facing away from the second surface, and disposed on the functional area of ​​the first surface; The first surface includes a first functional area and a second functional area, and the functional layer includes a first functional layer and a second functional layer; the first functional layer is arranged on the first functional area of ​​the first surface, and the second functional layer is arranged on the second functional area of ​​the first surface; the first functional layer includes a hydrophobic layer, and the hydrophobic layer on the super hydrophilic surface structure formed on the first surface has a better hydrophobic effect; the second functional layer includes a plain leather, and the bonding strength between the plain leather on the super hydrophilic surface structure formed on the first surface and the first surface is improved.

2. The housing structure according to claim 1, characterized in that: The material of the hydrophobic layer is perfluoropolyether or silane.

3. The housing structure according to claim 1 or 2, characterized in that: The substrate is metal, glass, glass fiber board, composite board or injection molded part.

4. The housing structure according to any one of claims 1 to 3, characterized in that: The static contact angle of the first surface of the substrate is less than or equal to 20°.

5. The housing structure according to claim 4, characterized in that: The static contact angle of the hydrophobic layer is greater than or equal to 130°.

6. An electronic device, characterized in that: The invention comprises the housing structure as described in any one of claims 1 to 5.

7. A method for preparing a shell structure, characterized in that: Used to prepare the shell structure according to any one of claims 1 to 5; The method for preparing the shell structure comprises: Providing a substrate, the substrate comprising a first surface and a second surface opposite to each other; Performing laser engraving on the first surface using a femtosecond laser to form a plurality of raised portions in M ​​rows and N columns, wherein M is a positive integer greater than or equal to 1, and N is a positive integer greater than or equal to 1; The first functional area of ​​the first surface is dipped or deposited with perfluoropolyether or silane to form the hydrophobic layer on the first functional area of ​​the first surface, and the second functional area of ​​the first surface is treated with a hydrophilic surface chemical modifier; the plain leather is set on the second functional area of ​​the first surface by an adhesive.

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