Patent Publication Number: US-2023164256-A1

Title: Cover body structure, back cover, and electronic device

Description:
This application claims priority to Chinese Patent Application No. 202011255192.2, filed with the China National Intellectual Property Administration on Nov. 11, 2020 and entitled “COVER BODY STRUCTURE, BACK COVER, AND ELECTRONIC DEVICE”, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     This application relates to the field of electronic device technologies, and in particular, to a cover body structure, a back cover, and an electronic device. 
     BACKGROUND 
     Housings of electronic devices such as smartphones and tablet computers include cover body structures including glass cover plates and plastic edge portions. With the development of technologies and the improvement of people&#39;s living standards, users hope that the outer surface of a glass cover plate and the outer surface of a plastic edge portion in such a cover body structure are continuously connected without interruption, to meet the users&#39; requirements for the appearance delicacy of the electronic device. In addition, users hope that the glass cover plate and the plastic edge portion in such a cover body structure are tightly fixed, to improve the structural strength of the housing of the electronic device. However, in the related art, such a cover body structure usually cannot meet the requirements for both the appearance delicacy and the structural strength. 
     SUMMARY 
     Embodiments of this application provide a cover body structure, a back cover, and an electronic device, which can improve the structural strength of the cover body structure while ensuring the appearance delicacy of the cover body structure. 
     To achieve the foregoing objective, the following technical solutions are used in the embodiments of this application: 
     According to a first aspect, some embodiments of this application provide a cover body structure. The cover body structure includes a glass cover plate, a first ink layer, a first glue layer, and a plastic edge portion. The first ink layer is disposed at least on an edge of the glass cover plate; the first glue layer is disposed on the first ink layer on the edge of the glass cover plate; and the plastic edge portion is disposed on the first glue layer on the edge of the glass cover plate. the first glue layer is a glue layer viscous at least at an injection molding temperature of the plastic edge portion, and the first ink layer is an ink layer that is able to withstand the injection molding temperature of the plastic edge portion. 
     In the foregoing technical solutions, because the first ink layer and the first glue layer are added between the edge of the glass cover plate and the plastic edge portion, and the bonding strength between an ink material and a glass material is better, the roughness of a surface of the glass cover plate can be improved by using the first ink layer. When the glass cover plate is bonded to the plastic edge portion by using the first glue layer, the first glue layer can penetrate a micro recessed region on a surface of the first ink layer, which increases an actual bonding area between the glass cover plate and the plastic edge portion in a unit region, thereby increasing a bonding force between the glass cover plate and the plastic edge portion. In addition, because the first glue layer is a glue layer viscous at least at the injection molding temperature of the plastic edge portion, and the first ink layer is an ink layer that is able to withstand the injection molding temperature of the plastic edge portion, the plastic edge portion can be molded on the edge of the glass cover plate through an injection molding process to match an edge size of the glass cover plate by using a molten plastic material that does not have a specific shape, thereby ensuring the appearance delicacy of the cover body structure. 
     In a possible implementation of the first aspect, the glass cover plate includes an outer surface, an inner surface, and a first side surface located between an edge circumference of the outer surface and an edge circumference of the inner surface, the inner surface includes an edge region, the first ink layer is disposed at least on the edge region, the first glue layer is disposed on the first ink layer on the edge region, the plastic edge portion is disposed on the first side surface and the first glue layer on the edge region, the plastic edge portion is disposed around an edge circumference of the glass cover plate, and the plastic edge portion and the glass cover plate enclose an accommodating groove on a side of the inner surface away from the outer surface. In this way, a part of the first side surface close to the outer surface and a part of the first side surface close to the inner surface do not need to be provided with step surfaces through a computer numerical control processing technology, and therefore, a processing technology of the cover body structure is simple. 
     In a possible implementation of the first aspect, an inner surface of the plastic edge portion is provided with at least three first positioning post pull-out holes, the at least three first positioning post pull-out holes are evenly arranged around the edge circumference of the glass cover plate, the first positioning post pull-out hole extends along a direction perpendicular to the glass cover plate, and a partial region of the edge region and a partial region of the first side surface form a partial inner surface region of the first positioning post pull-out hole. In this way, the first positioning post pull-out hole can avoid a positioning post, so that the glass cover plate can be positioned on an injection molding machine by using at least three positioning posts. 
     In a possible implementation of the first aspect, the first glue layer is a thermally activated glue layer, activated in a first temperature range, and solidified in a second temperature range; the first temperature range includes the injection molding temperature of the plastic edge portion; and a maximum temperature value of the second temperature range is less than a minimum temperature value of the first temperature range. In this way, after the first glue layer is disposed on the first ink layer on the edge of the glass cover plate, the first glue layer may be heated or cooled to the second temperature range to solidify the first glue layer, which helps to transport the glass cover plate provided with the first ink layer and the first glue layer to the injection molding machine, thereby avoiding an undesirable phenomenon such as being bonded to another device or being scraped during transportation. 
     In a possible implementation of the first aspect, the thermally activated glue layer is in a fluid state and viscous at a temperature of 200° C. to 400° C., and is in a solid state and not viscous at 0° C. to 40° C. 
     In a possible implementation of the first aspect, the second temperature range includes a temperature range in a normal temperature state. In this way, after the first glue layer is disposed on the first ink layer on the edge of the glass cover plate, the first glue layer can be solidified as long as the first glue layer is cooled to a normal temperature. Therefore, no other heating or cooling device is needed to maintain the temperature of the first glue layer to keep the first glue layer in a solidified state during transportation. 
     In a possible implementation of the first aspect, a material of the first glue layer includes at least one of organic silica glue, phenolic resin glue, urea-formaldehyde resin glue, temperature-resistant epoxy glue, or polyimide glue. 
     In a possible implementation of the first aspect, the glass cover plate includes an outer surface, an inner surface, and a first side surface located between an edge circumference of the outer surface and an edge circumference of the inner surface, the glass cover plate further includes a first step surface and a second side surface, the first step surface is located outside an edge of the outer surface, both the first step surface and the outer surface face a side that is of a plane on which the outer surface is located and that is away from a plane on which the inner surface is located, the first step surface has an outer edge away from a center of the outer surface and an inner edge close to the center of the outer surface, the outer edge of the first step surface is connected to an edge of the first side surface close to the outer surface, the second side surface is connected between the inner edge of the first step surface and the outer surface, and a distance from the first step surface to the inner surface is less than a distance from the outer surface to the inner surface; and the first ink layer is disposed at least on the first step surface, the first glue layer is disposed at least on the first ink layer on the first step surface, and the plastic edge portion is disposed on the first side surface, the first glue layer on the first step surface, and the second side surface. In this way, when the plastic edge portion is molded on the first side surface, the first glue layer on the first step surface, and the second side surface through an injection molding process, an outer surface of the plastic edge portion can be continuously connected to the outer surface of the glass cover plate, thereby ensuring the appearance delicacy of the cover body structure. Both the first step surface and the outer surface face the side that is of the plane on which the outer surface is located and that is away from the plane on which the inner surface is located, the first ink layer is disposed on the first step surface, and the first glue layer is disposed on the first ink layer on the first step surface, thereby facilitating the arrangement of the first ink layer and the first glue layer on the edge of the glass cover plate. The plastic edge portion is disposed on the first side surface on the edge of the glass cover plate, the first glue layer on the first step surface, and the second side surface, and the plastic edge portion can form an inward buckling structure. When the cover body structure is applied to a housing of the electronic device, the plastic edge portion can apply a force directed to an inner side of the glass cover plate to the glass cover plate, to prevent the glass cover plate from falling off the plastic edge portion. 
     In a possible implementation of the first aspect, an edge of the first side surface close to the inner surface is connected to the edge circumference of the inner surface. 
     In a possible implementation of the first aspect, a central region of the inner surface is provided with at least one positioning groove. The at least one positioning groove is used for cooperating with positioning posts on the injection molding machine to fix the glass cover plate provided with the first ink layer and the first glue layer to a preset position on the injection molding machine, to facilitate a subsequent operation of molding the plastic edge portion on the edge of the glass cover plate. 
     In a possible implementation of the first aspect, the positioning groove is a circular groove, and there are a plurality of positioning grooves. 
     In a possible implementation of the first aspect, the positioning groove is a rectangular groove, a square groove, a triangular groove, or a kidney-shaped groove, and there is one positioning groove. 
     In a possible implementation of the first aspect, the glass cover plate further includes a second step surface and a third side surface, the second step surface is located outside an edge of the inner surface, both the second step surface and the inner surface face a side that is of the plane on which the inner surface is located and that is away from the plane on which the outer surface is located, the second step surface has an outer edge away from a center of the inner surface and an inner edge close to the center of the inner surface, the outer edge of the second step surface is connected to an edge of the first side surface close to the inner surface, the third side surface is connected between the inner edge of the second step surface and the inner surface, and a distance from the second step surface to the outer surface is less than a distance from the inner surface to the outer surface; and the plastic edge portion is further disposed on the second step surface and the third side surface. In this way, a bonding area between the plastic edge portion and the glass cover plate can be increased by using the second step surface and the third side surface, thereby further increasing a bonding force between the plastic edge portion and the glass cover plate, and improving the structural strength of the cover body structure. The second step surface and the third side surface may further cooperate with positioning posts to position the glass cover plate on the injection molding machine. 
     In a possible implementation of the first aspect, the glass cover plate further includes a second step surface and a third side surface, the second step surface is located outside an edge of the inner surface, both the second step surface and the inner surface face a side that is of the plane on which the inner surface is located and that is away from the plane on which the outer surface is located, the second step surface has an outer edge away from a center of the inner surface and an inner edge close to the center of the inner surface, the outer edge of the second step surface is connected to an edge of the first side surface close to the inner surface, the third side surface is connected between the inner edge of the second step surface and the inner surface, and a distance from the second step surface to the outer surface is less than a distance from the inner surface to the outer surface; and the first ink layer is further disposed on the second step surface, the first glue layer is further disposed on the first ink layer on the second step surface, and the plastic edge portion is further disposed on the first glue layer on the second step surface and the third side surface. In this way, a bonding area between the plastic edge portion and the glass cover plate can be increased by using the second step surface and the third side surface, a bonding force between the plastic edge portion and the second step surface in a unit area can be also increased by using the first ink layer and the first glue layer that are on the second step surface, thereby further increasing a bonding force between the plastic edge portion and the glass cover plate, and improving the structural strength of the cover body structure. The second step surface and the third side surface may further cooperate with positioning posts to position the glass cover plate on the injection molding machine. 
     In a possible implementation of the first aspect, the glass cover plate includes an outer surface, an inner surface, and a first side surface located between an edge circumference of the outer surface and an edge circumference of the inner surface, an edge of the first side surface close to the outer surface is connected to an edge circumference of the outer surface, the glass cover plate further includes a second step surface and a third side surface, the second step surface is located outside an edge of the inner surface, both the second step surface and the inner surface face a side that is of a plane on which the inner surface is located and that is away from a plane on which the outer surface is located, the second step surface has an outer edge away from a center of the inner surface and an inner edge close to the center of the inner surface, the outer edge of the second step surface is connected to an edge of the first side surface close to the inner surface, the third side surface is connected between the inner edge of the second step surface and the inner surface, and a distance from the second step surface to the outer surface is less than a distance from the inner surface to the outer surface; and the first ink layer is disposed on the second step surface, the first glue layer is disposed on the first ink layer on the second step surface, the plastic edge portion is disposed on the first side surface, the first glue layer on the second step surface, and the third side surface. In this way, both the second step surface and the inner surface face the side that is of the plane on which the inner surface is located and that is away from the plane on which the outer surface is located, the first ink layer is disposed on the second step surface, and the first glue layer is disposed on the first ink layer on the second step surface, thereby facilitating the arrangement of the first ink layer and the first glue layer on the edge of the glass cover plate. The second step surface and the third side surface may further cooperate with positioning posts to position the glass cover plate on the injection molding machine. 
     In a possible implementation of the first aspect, there are a plurality of second step surfaces, the plurality of second step surfaces are arranged along the edge of the inner surface, and outer edges of the plurality of second step surfaces are all connected to the first side surface; and there are also a plurality of third side surfaces, a quantity of the plurality of third side surfaces is equal to a quantity of the plurality of second step surfaces, the plurality of third side surfaces are in a one-to-one correspondence to the plurality of second step surfaces, and each third side surface is connected between an inner edge of the second step surface corresponding to the third side surface and the inner surface. The structure is simple, and there are fewer computer numerical control processing regions on the glass cover plate. 
     In a possible implementation of the first aspect, the plurality of second step surfaces include at least three second step surfaces evenly arranged around the edge circumference of the inner surface, positions that are on an inner surface of the plastic edge portion and that correspond to the at least three second step surfaces are provided with second positioning post pull-out holes, the second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate, and the second step surface and the third side surface connected to the second step surface form a partial inner surface region of the second positioning post pull-out hole. In this way, the second positioning post pull-out hole can avoid the positioning post, so that the glass cover plate can be positioned on the injection molding machine by using the at least three positioning posts, which is simple and easy to implement. 
     In a possible implementation of the first aspect, the second step surface is disposed around the edge circumference of the inner surface, and the third side surface is disposed around the edge circumference of the inner surface. The structure is simple, and it is convenient to operate when the second step surface is processed by computer numerical control. 
     In a possible implementation of the first aspect, the second step surface includes at least three step surface regions, the at least three step surface regions are evenly arranged around the edge circumference of the inner surface, positions that are on an inner surface of the plastic edge portion and that correspond to the at least three step surface regions are provided with second positioning post pull-out holes, the second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate, and the step surface region and a partial region of the third side surface connected to the step surface region form a partial inner surface region of the second positioning post pull-out hole. In this way, the glass cover plate is positioned on the injection molding machine by using the at least three positioning posts, which is simple and easy to implement. 
     In a possible implementation of the first aspect, the first ink layer includes at least one of a color ink layer, a black ink layer, a white ink layer, or a transparent ink layer. 
     In a possible implementation of the first aspect, the first ink layer is disposed on the edge of the glass cover plate through at least one of a glass direct molding process, a silk screen printing process, or a pad printing process. 
     According to a second aspect, some embodiments of this application provide a back cover. The back cover includes a back cover body and the cover body structure according to any one of the technical solutions of the first aspect. The back cover body includes an outer surface and an inner surface opposite to each other, and an opening passing through the outer surface of the back cover body and the inner surface of the back cover body is provided on the back cover body; and the cover body structure is disposed at the opening, an orientation of an outer surface of a glass cover plate of the cover body structure is the same as an orientation of the outer surface of the back cover body, and a plastic edge portion of the cover body structure is fixed to an edge of the back cover body at the opening. 
     According to the foregoing solutions, the back cover includes the cover body structure according to any one of the technical solutions of the first aspect. Because the structural strength and appearance delicacy of the cover body structure are better, improvements in the structural strength and appearance delicacy of the back cover are facilitated. 
     In a possible implementation of the second aspect, the back cover further includes a second ink layer and a second glue layer. The second ink layer is disposed at least on the edge of the back cover body at the opening. The second glue layer is disposed on the second ink layer on the edge of the back cover body at the opening. The plastic edge portion is further disposed on the second glue layer on the edge of the back cover body at the opening. The second glue layer is a glue layer viscous at least at an injection molding temperature of the plastic edge portion, and the second ink layer is an ink layer that is able to withstand the injection molding temperature of the plastic edge portion. In this way, the plastic edge portion of the cover body structure and the edge of the back cover body at the opening can be molded into a whole through an injection molding process. The structure is simple with relatively high bonding strength while ensuring the appearance delicacy of the back cover. 
     According to a third aspect, some embodiments of this application provide an electronic device. The electronic device includes a camera module and the cover body structure according to any one of the technical solutions of the first aspect or includes a camera module and the back cover according to any one of the technical solutions of the second aspect. The camera module is disposed on an inner side of the cover body structure, and a light-incident surface of the camera module faces a glass cover plate of the cover body structure. 
     In the foregoing technical solutions, because the electronic device includes the cover body structure according to any one of the technical solutions of the first aspect or the back cover according to any one of the technical solutions of the second aspect, the back cover according to any one of the technical solutions of the second aspect includes the cover body structure according to any one of the technical solutions of the first aspect, and the structural strength and appearance delicacy of the cover body structure are better, improvements in the structural strength and appearance delicacy of the electronic device are facilitated. 
     In a possible implementation of the third aspect, the camera module is a rear-facing camera module. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1   a    is a front view of an electronic device according to some embodiments of this application; 
         FIG.  1 B  is an exploded view of the electronic device shown in  FIG.  1     a;    
         FIG.  1   c    is a schematic cross-sectional structural diagram of the electronic device shown in  FIG.  1   a    along an A-A direction; 
         FIG.  2   a    is a schematic cross-sectional structural diagram of a cover body structure according to some embodiments of this application; 
         FIG.  2   b    is a three-dimensional view of a cover body structure according to some other embodiments of this application; 
         FIG.  3    is a three-dimensional view of a glass cover plate in a cover body structure according to some embodiments of this application; 
         FIG.  4    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of the glass cover plate shown in  FIG.  3    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod; 
         FIG.  5    is a cross-sectional view of the cover body structure shown in  FIG.  4   ; 
         FIG.  6    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of the glass cover plate shown in  FIG.  3    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate is switched to be clamped by an outer surface and an inner surface of the glass cover plate by using a structure such as a vacuum sucker or ebonite; 
         FIG.  7    is a three-dimensional view of a glass cover plate in a cover body structure according to some other embodiments of this application; 
         FIG.  8    is a schematic cross-sectional structural diagram of a cover body structure according to some other embodiments of this application; 
         FIG.  9    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of a glass cover plate in the cover body structure shown in  FIG.  8    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod; 
         FIG.  10    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of a glass cover plate in the cover body structure shown in  FIG.  8    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate is switched to be clamped by an outer surface and an inner surface of the glass cover plate by using a structure such as a vacuum sucker or ebonite; 
         FIG.  11    is a schematic cross-sectional structural diagram of a cover body structure according to some other embodiments of this application; 
         FIG.  12    is a schematic cross-sectional structural diagram of a cover body structure according to some other embodiments of this application; 
         FIG.  13    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of a glass cover plate in the cover body structure shown in  FIG.  12    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod; 
         FIG.  14    is a schematic cross-sectional structural diagram of the cover body structure shown in  FIG.  13   ; 
         FIG.  15    is a three-dimensional view of a cover body structure obtained after a plastic edge portion is molded on an edge of a glass cover plate in the cover body structure shown in  FIG.  12    when the glass cover plate is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate is switched to be clamped by an outer surface and an inner surface of the glass cover plate by using a structure such as a vacuum sucker or ebonite; 
         FIG.  16    is a schematic structural diagram of applying the cover body structure shown in  FIG.  12    to a back cover in the electronic device shown in  FIG.  1   a    to  FIG.  1     c;    
         FIG.  17    is another schematic structural diagram of applying the cover body structure shown in  FIG.  12    to a back cover in the electronic device shown in  FIG.  1   a    to  FIG.  1     c;  and 
         FIG.  18    is a schematic cross-sectional structural diagram of an electronic device according to some embodiments of this application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     In the embodiments of this application, terms “first” and “second” are used merely for the purpose of description, and shall not be construed as indicating or implying relative importance or implying a quantity of indicated technical features. Therefore, features defining “first” and “second” may explicitly or implicitly include one or more such features. 
     It should be noted that, in the embodiments of this application, the terms “include”, “comprise”, and any variants thereof are intended to cover a non-exclusive inclusion. Therefore, in the context of a process, method, object, or apparatus that includes a series of elements, the process, method, object, or apparatus not only includes such elements, but also includes other elements not specified expressly, or may include inherent elements of the process, method, object, or apparatus. Without more limitations, elements defined by the sentence “including one” does not exclude that there are still other same elements in the processes, methods, objects, or apparatuses. 
     This application provides an electronic device. The electronic device may be a portable electronic apparatus or another suitable electronic apparatus. For example, the electronic device may be a notebook computer, a tablet computer, a smaller device such as a mobile phone, a watch, a pendant device or another wearable or micro device, a cellular phone, or a media player. 
       FIG.  1   a    is a front view of an electronic device according to some embodiments of this application.  FIG.  1 B  is an exploded view of the electronic device shown in  FIG.  1     a.    FIG.  1   c    is a schematic cross-sectional structural diagram of the electronic device shown in  FIG.  1   a    along an A-A direction. In the embodiments, the electronic device is a mobile phone. The electronic device includes a front cover plate  10 , a middle frame  20 , a back cover  30 , a display module  40 , and a camera module  50 . 
     The middle frame  20  includes a middle plate  210  and a frame  220  arranged around an edge circumference of the middle plate  210 . The front cover plate  10  and the back cover  30  are stacked on two opposite sides of the middle plate  210  and fixed to the frame  220 . The front cover plate  10 , the back cover  30 , and the frame  220  form a part of a housing of the electronic device. 
     The display module  40  is configured to display an image or a video. The display module  40  is attached to a surface of the front cover plate  10  close to the middle plate  210 . A display surface of the display module  40  faces the front cover plate  10 . The front cover plate  100  is configured to protect the display module  40  and transmit image light of the display module  40 . 
     The camera module  50  is a rear-facing camera module. The camera module  50  is disposed between the middle plate  210  and the back cover  30 . At present, due to the limitation of the structural complexity, a size of the camera module  50  along an optical axis is difficult to shrink. In addition, as users pursue an ultra-thin electronic device body, an electronic device is becoming increasingly thin. Therefore, to avoid the camera module  50 , the back cover  30  includes a back cover body  310 . An opening  330  is provided on the back cover body  310 . An object side end of the camera module  50  (that is, an end of the camera module  50  close to a photographed landscape during working) stretches into the opening  330 . On this basis, in order to protect the camera module, the back cover  30  further includes a decorative cover  320 . The decorative cover  320  is installed at the opening  330  and fixed to an edge of the back cover at the opening  330 . The decorative cover  320  covers the object side end of the camera module  50  to protect the camera module  50 , and the decorative cover  320  is provided with a light-transmissive region. The light-transmissive region is opposite to a light-incident surface of the camera module  50 . The decorative cover  320  also forms a part of the housing of the electronic device. 
     Because the glass cover plate is characterized by good light transmission and low price, and the plastic is characterized by being easy to form a curved appearance and low costs, the cover body structure including the glass cover plate and a plastic edge portion disposed on an edge of the glass cover plate has been widely applied to the electronic device shown in  FIG.  1   a    to  FIG.  1     c.  For example, the front cover plate  10  includes a light-transmissive glass cover plate and a plastic edge portion disposed on an edge of the glass cover plate. The plastic edge portion is configured to meet 2.5D or 3D appearance design requirements of the front cover plate  10 . In another example, the decorative cover  320  includes a glass cover plate and a plastic edge portion disposed around an edge circumference of the glass cover plate. The plastic edge portion is configured to fix relative positions of the glass cover plate and the back cover  30  and seal a gap between the edge circumference of the glass cover plate and the edge circumference of the back cover at the opening  330 . 
     To mold the cover body structure including the glass cover plate and the plastic edge portion, the glass cover plate and the plastic edge portion may be molded separately, and the glass cover plate and the plastic edge portion with a determinate shape are then assembled through gluing. However, in this way, a gap usually occurs between the glass cover plate and a plastic frame due to the limitation of processing accuracy or assembly accuracy, which makes it difficult to ensure the appearance delicacy of the cover body structure. To resolve the problem, the plastic edge portion may be directly molded on the edge of the glass cover plate through an injection molding process to match an edge size of the glass cover plate by using a molten plastic material in an indeterminate shape, thereby avoiding occurrence of a gap between the plastic edge portion and the glass cover plate, and further ensuring the appearance delicacy of the cover body structure. However, due to a weak bonding force between glass and plastic, if the plastic edge portion is directly molded on a surface of the glass cover plate, the connection strength between the plastic edge portion and the glass cover plate is relatively low, which further causes relatively low structural strength of the cover body structure. 
     In order to improve the structural strength of the cover body structure while ensuring the appearance delicacy of the cover body structure, this application provides a cover body structure. The cover body structure forms a part of the housing of the electronic device. Specifically, the cover body structure may be a front cover plate of the electronic device or a decorative cover of a camera module of the electronic device, which is not specifically limited herein. 
       FIG.  2   a    is a schematic cross-sectional structural diagram of a cover body structure  1  according to some embodiments of this application. The cover body structure  1  includes a glass cover plate  11 , a first ink layer  12 , a first glue layer  13 , and a plastic edge portion  14 . 
     The material of the glass cover plate  11  is glass, and the shape of the glass cover plate  11  includes, but is not limited to, a circular flat plate shape, an elliptical flat plate shape, a triangular flat plate shape, a square flat plate shape, and a polygonal flat plate shape. 
     The glass cover plate  11  includes an outer surface  100  and an inner surface  200  opposite to each other, and a first side surface  300  located between an edge circumference of the outer surface  100  and an edge circumference of the inner surface  200 . 
     The outer surface  100  refers to a surface facing the outside of an electronic device when the glass cover plate  11  is applied to the electronic device, and the outer surface  100  is a plane. 
     The inner surface  200  refers to a surface facing the inside of the electronic device when the glass cover plate  11  is applied to the electronic device, and the inner surface  200  is a plane parallel to the outer surface  100 . 
     The first side surface  300  is an annular surface surrounding the edge circumference of the outer surface  100  (or the inner surface  200 ). The first side surface  300  may be perpendicular to the outer surface  100  (or the inner surface  200 ), or may tilt relative to the outer surface  100  (or the inner surface  200 ). This is not specifically limited herein. In the embodiment shown in  FIG.  2   a   , the first side surface  300  is perpendicular to the outer surface  100  (or the inner surface  200 ). This cannot be considered as a special limitation on this application. 
     An edge of the first side surface  300  close to the outer surface  100  may be connected to the edge circumference of the outer surface  100 , or may be separated from a part of an edge of the outer surface  100  by using a middle surface, or may be separated from the edge circumference of the outer surface  100  by using a middle surface. This is not specifically limited herein. In the embodiment shown in  FIG.  2   a   , the edge of the first side surface  300  close to the outer surface  100  is separated from the edge circumference of the outer surface  100  by using a middle surface including a first step surface  400  and a second side surface  500 . This cannot be considered as a special limitation on this application. 
     Similarly, an edge of the first side surface  300  close to the inner surface  200  may be connected to the edge circumference of the inner surface  200 , or may be separated from a part of an edge of the inner surface  200  by using a middle surface, or may be separated from the edge circumference of the inner surface  200  by using a middle surface. This is not specifically limited herein. In the embodiment shown in  FIG.  2   a   , the edge of the first side surface  300  close to the inner surface  200  is connected to the edge circumference of the inner surface  200 . This cannot be considered as a special limitation on this application. 
     In this embodiment of this application, an edge region of the outer surface  100 , a middle surface between the outer surface  100  and the first side surface  300 , the first side surface  300 , a middle surface between the first side surface  300  and the inner surface  200 , and an edge region of the inner surface  200  form an edge of the glass cover plate  11 . 
     The first ink layer  12  may be at least one of a black ink layer, a color ink layer, a white ink layer, or a transparent ink layer. This is not specifically limited herein. 
     The first ink layer  12  is disposed at least on the edge of the glass cover plate  11 . That is, the first ink layer  12  may be disposed on only the edge of the glass cover plate  11 , or the first ink layer  12  may be disposed on another region of the glass cover plate  11  such as a central region of the inner surface  200  in addition to the edge of the glass cover plate  11 . 
     A part of the first ink layer  12  disposed on the edge of the glass cover plate  11  may be disposed on a partial region of the edge of the glass cover plate  11 , for example, the edge region of the outer surface  100 , the middle surface between the outer surface  100  and the first side surface  300 , the middle surface between the first side surface  300  and the inner surface  200 , or the edge region of the inner surface  200 , or may be disposed on an entire region of the edge of the glass cover plate  11 . This is not specifically limited herein. 
     The first ink layer  12  may be disposed at least on the edge of the glass cover plate  11  through at least one of a glass direct molding (glass direct molding, GDM) process, a silk screen printing process, or a pad printing process. This is not specifically limited herein. 
     The first glue layer  13  is disposed on the first ink layer  12  on the edge of the glass cover plate  11 . In some embodiments, the first glue layer  13  may be disposed on the first ink layer  12  on the edge of the glass cover plate  11  through at least one of a blade coating process, a roll coating process, a dip coating process, or a spray coating process. This is not specifically limited herein. 
     The material of the plastic edge portion  14  includes, but is not limited to, at least one of polyethylene glycol terephthalate (polyethylene glycol terephthalate, PET), polyphenylene sulfide (polyphenylene sulfide, PPS), or polyethylene (polyethylene, PE). 
     The plastic edge portion  14  is molded at least on the first glue layer  13  on the edge of the glass cover plate  11  through an injection molding process. That is, the plastic edge portion  14  is molded on the edge of the glass cover plate  11  through an injection molding process, and at least a part of the plastic edge portion  14  covers the first glue layer  13 . 
     The plastic edge portion  14  may be molded on one side edge of the glass cover plate  11 , two side edges opposite to each other, or three adjacent side edges, or may be molded on the edge circumference of the glass cover plate  11 . This is not specifically limited herein. In the embodiment shown in  FIG.  2   a   , the plastic edge portion  14  is molded on the edge circumference of the glass cover plate  11  through an injection molding process. This cannot be considered as a special limitation on this application. 
     The injection molding process of the plastic edge portion  14  may be as follows: First, the glass cover plate  11  provided with the first ink layer  12  and the first glue layer  13  is carried on and fixed to a preset position on an injection molding machine; second, an injection mold is closed (that is, a mold closing process), to enclose a mold cavity with the same shape as a contour shape of the plastic edge portion  14 , and connect the mold cavity to the edge of the glass cover plate  11 ; next, a molten plastic material is injected into the mold cavity by using pressure, and the molten plastic material is bonded at least to the first glue layer  13  on the edge of the glass cover plate  11 ; and finally, the plastic material is cooled to solidify the plastic material, and the solidified plastic material is the plastic edge portion  14 . 
     The plastic edge portion  14  is molded at least on the first glue layer  13  on the edge of the glass cover plate  11  through an injection molding process, and during the injection molding process, the plastic material in a molten state is in contact with the first glue layer  13 . Therefore, to avoid a case that the first glue layer  13  loses viscosity during the injection molding process, the first glue layer  13  needs to be a glue layer viscous at least at an injection molding temperature of the plastic edge portion  14  (that is, a temperature of the plastic material in a molten state). For example, if the injection molding temperature of the plastic edge portion  14  is 380° C. to 400° C., the first glue layer  13  is a glue layer viscous at least at a temperature of 380° C. to 400° C. 
     The first glue layer  13  may be a glue layer viscous at all temperatures, or may be a glue layer viscous only at the injection molding temperature of the plastic edge portion  14 , or may be a glue layer viscous in a relatively large temperature range including the injection molding temperature of the plastic edge portion  14 . This is not specifically limited herein. 
     In some embodiments, the first glue layer  13  is a thermally activated glue layer. The thermally activated glue layer is a type of glue layer that is in a fluid state and viscous at a relatively high temperature and that is solid and not viscous at a relatively low temperature. For example, the thermally activated glue layer is in a fluid state and viscous at a temperature of 200° C. to 400° C., and is solid and not viscous at 0° C. to 40° C. Specifically, the first glue layer  13  is activated in a first temperature range. In this case, the first glue layer  13  is viscous. The first temperature range includes the injection molding temperature of the plastic edge portion  14 . Specifically, the first temperature range may include only the injection molding temperature of the plastic edge portion  14 , or may be a relatively large temperature range including the injection molding temperature of the plastic edge portion  14 . This is not specifically limited herein. The first glue layer  13  is solidified in a second temperature range. A maximum temperature value of the second temperature range is less than a minimum temperature value of the first temperature range. In this way, after the first glue layer  13  is disposed on the first ink layer  12  on the edge of the glass cover plate  11 , the first glue layer  13  may be heated or cooled to the second temperature range to solidify the first glue layer  13 , which helps to transport the glass cover plate  11  provided with the first ink layer  12  and the first glue layer  13  to the injection molding machine, thereby avoiding an undesirable phenomenon such as being bonded to another device or being scraped during transportation. 
     In the foregoing embodiment, specific values of the first temperature range and the second temperature range are not limited, as long as the first temperature range includes the injection molding temperature of the plastic edge portion  14  and the maximum temperature value of the second temperature range is less than the minimum temperature value of the first temperature range. 
     In some embodiments, the second temperature range of the first glue layer  13  includes a temperature range in a normal temperature state. In this way, after the first glue layer  13  is disposed on the first ink layer  12  on the edge of the glass cover plate  11 , the first glue layer  13  can be solidified as long as the first glue layer  13  is cooled to a normal temperature. Therefore, no other heating or cooling device is needed to maintain the temperature of the first glue layer  13  to keep the first glue layer  13  in a solidified state during transportation. 
     A material of the first glue layer  13  may include at least one of organic silica glue, phenolic resin glue, urea-formaldehyde resin glue, temperature-resistant epoxy glue, or polyimide glue. This is not specifically limited herein. 
     Similarly, the plastic edge portion  14  is molded at least on the first glue layer  13  on the edge circumference of the glass cover plate  11  through an injection molding process; and during the injection molding process, the plastic material in a molten state is in contact with the first glue layer  13 , the first ink layer  12  is adjacent to the first glue layer  13 , and the temperature of the plastic material in a molten state is inevitably transferred to the first ink layer  12 . Therefore, in order to prevent an undesirable phenomenon such as discoloring or falling off the glass cover plate  11  due to being heated from occurring in the first ink layer  12 , the first ink layer  12  needs to be an ink layer that can withstand the injection molding temperature of the plastic edge portion  14 . For example, if the injection molding temperature of the plastic edge portion  14  is 380° C. to 400° C., the first ink layer  12  is an ink layer that can withstand a temperature of 400° C. In another example, if the injection molding temperature of the plastic edge portion  14  is 380° C., the first ink layer  12  is an ink layer that can withstand a temperature of 380° C. 
     In this embodiment of this application, because the plastic edge portion  14  is molded on the edge of the glass cover plate  11  through an injection molding process and matches an edge size of the glass cover plate  11  in this process by using a molten plastic material that does not have a specific shape, an outer surface of the plastic edge portion  14  can be continuously connected to the outer surface of the glass cover plate  11 , thereby ensuring the appearance delicacy of the cover body structure  1 . In addition, because the first ink layer  12  is disposed at least on the edge of the glass cover plate  11 , and a bonding force per unit area between an ink layer and glass is greater than a bonding force in a unit bonding area between plastic and glass when the plastic is directly molded on the glass through an injection molding process, it can be learned that a bonding force between the first ink layer  12  and the glass cover plate  11  is larger. Further, the first glue layer  13  is disposed at least on the first ink layer  12  on the edge of the glass cover plate  11 , a bonding force per unit area between a glue layer and ink is also greater than a bonding force in a unit bonding area between plastic and glass when the plastic is directly molded on the glass through an injection molding process. Therefore, it can be learned that a bonding force between the first glue layer  13  and the first ink layer  12  is larger. Still further, because the plastic edge portion  14  is disposed at least on the first glue layer  13  on the edge of the glass cover plate  11  through an injection molding process, and a bonding force per unit area between plastic and a glue layer is greater than a bonding force in a unit bonding area between plastic and glass when the plastic is directly molded on the glass through an injection molding process, a bonding force between the plastic edge portion  14  and the first glue layer  13  is larger. Based on the above, bonding forces per unit area of bonding surfaces of different media between the edge of the glass cover plate  11  and the plastic edge portion  14  are all greater than a bonding force in a unit bonding area between plastic and glass when the plastic is directly molded on the glass through an injection molding process. Therefore, the structural strength of the cover body structure  1  provided in this embodiment of this application is larger. 
     In the foregoing embodiment, structure forms of the edge of the glass cover plate  11  may be various. Correspondingly, disposition positions of the first ink layer  12 , the first glue layer  13 , and the plastic edge portion  14  are also different. Specifically, the structure forms of the edge of the glass cover plate  11  and the disposition positions of the first ink layer  12 , the first glue layer  13 , and the plastic edge portion  14  may include the following embodiment  1  to embodiment  3 . 
     Embodiment 1: Still referring to  FIG.  2   a   , the glass cover plate  11  includes the outer surface  100 , the inner surface  200 , and the first side surface  300  located between the edge circumference of the outer surface  100  and the edge circumference of the inner surface  200 . In addition, the glass cover plate  11  further includes a first step surface  400  and a second side surface  500 . 
     In some embodiments, the first step surface  400  and the second side surface  500  are processed and molded by using a milling cutter on a computer numerical control (computer numerical control, CNC) machine tool. 
     The first step surface  400  is located outside an edge of the outer surface  100 . That is, the first step surface  400  is located on a side of the edge of the outer surface  100  away from a center of the outer surface  100 . 
     The first step surface  400  may be a relatively small surface located outside one side edge of the outer surface  100 , or may be a relatively large annular surface disposed around an edge circumference of the outer surface  100 . This is not specifically limited herein. In the embodiment shown in  FIG.  2   a   , the first step surface  400  is an annular surface disposed around the edge circumference of the outer surface  100 . This cannot be considered as a special limitation on this application. 
     Both the first step surface  400  and the outer surface  100  face a side that is of a plane on which the outer surface  100  is located and that is away from a plane on which the inner surface  200  is located. In other words, that is, if a part of space located on the side that is of the plane on which the outer surface  100  is located and that is away from the plane on which the inner surface  200  is located is defined as an outer space of the glass cover plate  11 , the first step surface  400  and the outer surface  100  are both opposite to the outer space of the glass cover plate  11 . 
     The first step surface  400  has an outer edge disposed away from the center of the outer surface  100  and an inner edge disposed close to the center of the outer surface  100 . The outer edge of the first step surface  400  is connected to an edge of the first side surface  300  close to the outer surface  100 . The second side surface  500  is connected between the inner edge of the first step surface  400  and the outer surface  100 . A distance from the first step surface  400  to the inner surface  200  is less than a distance from the outer surface  100  to the inner surface  200 . That is, a distance from each part of the first step surface  400  to the inner surface  200  is less than the distance from the outer surface  100  to the inner surface  200 . 
     The first step surface  400  may be a plane or a curved surface. This is not specifically limited herein. When the first step surface  400  is a plane, the first step surface  400  may be parallel to the outer surface  100  (or the inner surface  200 ), or may tilt relative to the outer surface  100  (or the inner surface  200 ). This is not specifically limited herein. 
     The second side surface  500  may be a plane or a curved surface. This is not specifically limited herein. The second side surface  500  may be perpendicular to the outer surface  100  (or the inner surface  200 ), or may tilt relative to the outer surface  100  (or the inner surface  200 ). This is not specifically limited herein. 
     The first ink layer  12  is disposed at least on the first step surface  400 , the first glue layer  13  is disposed at least on the first ink layer  12  on the first step surface  400 , and the plastic edge portion  14  is molded at least on the first side surface  300 , the first glue layer  13  on the first step surface  400 , and the second side surface  500  through an injection molding process. 
     In this way, in the first aspect, because the plastic edge portion  14  is molded on the first side surface  300 , the first glue layer  13  on the first step surface  400 , and the second side surface  500  through an injection molding process, an outer surface of the plastic edge portion  14  can be continuously connected to the outer surface of the glass cover plate  11 , thereby ensuring the appearance delicacy of the cover body structure  1 . In the second aspect, both the first step surface  400  and the outer surface  100  face the side that is of the plane on which the outer surface  100  is located and that is away from the plane on which the inner surface  200  is located, the first ink layer  12  is disposed on the first step surface  400 , and the first glue layer  13  is disposed on the first ink layer  12  on the first step surface  400 , thereby facilitating the arrangement of the first ink layer  12  and the first glue layer  13  on the edge of the glass cover plate  11 . In the third aspect, because the plastic edge portion  14  is molded on the first side surface  300  on the edge of the glass cover plate  11 , the first glue layer  13  on the first step surface  400 , and the second side surface  500  through an injection molding process, the plastic edge portion  14  can form an inward buckling structure. When the cover body structure  1  is applied to a housing of the electronic device, the plastic edge portion  14  can apply a force directed to an inner side of the glass cover plate  11  (that is, a side that is of a plane on which the inner surface  200  is located and that is away from a plane on which the outer surface  100  is located) to the glass cover plate  11 , to prevent the glass cover plate  11  from falling off the plastic edge portion  14 . 
     In the foregoing embodiment, an edge of the first side surface  300  close to the inner surface  200  may be connected to the edge circumference of the inner surface  200 , or may be separated from at least a part of an edge of the inner surface  200  by using a middle surface. This is not specifically limited herein. Specifically, a connection form between the first side surface  300  and the inner surface  200  and disposition positions of the first ink layer  12 , the first glue layer  13 , and the plastic edge portion  14  may include the following first implementation to third implementation. 
     The first implementation: Still referring to  FIG.  2   a   , the edge of the first side surface  300  close to the inner surface  200  is directly connected to the edge circumference of the inner surface  200 . 
     On this basis, to fix the glass cover plate  11  provided with the first ink layer  12  and the first glue layer  13  to a preset position on an injection molding machine before the plastic edge portion  14  is injection molded, in some embodiments, referring to  FIG.  2   b    being a three-dimensional view of the cover body structure  1  according to some other embodiments of this application, a central region of the inner surface  200  of the glass cover plate  11  is provided with at least one positioning groove  201 . The at least one positioning groove  201  is used for cooperating with positioning posts on the injection molding machine to fix the glass cover plate  11  provided with the first ink layer  12  and the first glue layer  13  to the preset position on the injection molding machine, to facilitate a subsequent operation of molding the plastic edge portion  14  on the edge of the glass cover plate  11 . 
     The positioning groove  201  may be a through groove that passes through the glass cover plate  11  or a groove that does not passes through the glass cover plate  11 . This is not specifically limited herein. 
     The positioning groove  201  may be a rectangular groove, a square groove, a triangular groove, a circular groove, a kidney-shaped groove, or the like.  FIG.  2   b    only shows an example in which the positioning groove  201  is a rectangular groove. This cannot be considered as a special limitation on this application. 
     There may be one or more positioning grooves  201 .  FIG.  2   b    only shows an example in which there is one positioning groove  201 . This cannot be considered as a special limitation on this application. 
     It should be noted that, when the positioning groove  201  is a circular groove, to position the glass cover plate  11 , a plurality of positioning grooves  201  are needed. 
     In addition, it should be noted that, when the positioning groove  201  is a through groove passing through the glass cover plate  11 , after the plastic edge portion  14  is molded on the edge of the glass cover plate  11 , the positioning groove  201  needs to be filled with a transparent material to ensure the appearance of the glass cover plate  11 . 
     The second implementation: The edge of the first side surface  300  close to the inner surface  200  is separated from at least a part of the edge of the inner surface  200  by using a middle surface. Specifically,  FIG.  3    is a three-dimensional view of the glass cover plate  11  in the cover body structure  1  according to some embodiments of this application. The glass cover plate  11  further includes a second step surface  600  and a third side surface  700 . 
     In some embodiments, the second step surface  600  and the third side surface  700  are processed and molded by using a milling cutter on a computer numerical control (computer numerical control, CNC) machine tool. 
     The second step surface  600  is located outside an edge of the inner surface  200 . That is, the second step surface  600  is located on a side of the edge of the inner surface  200  away from a center of the inner surface  200 . 
     The second step surface  600  may be a relatively small surface located outside one side edge of the inner surface  200 , or may be a relatively large annular surface disposed around an edge circumference of the inner surface  200 . This is not specifically limited herein. In the embodiment shown in  FIG.  3   , the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 . This cannot be considered as a special limitation on this application. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , there may be one or more second step surfaces  600 . This is not specifically limited herein. When there are a plurality of second step surfaces  600 , the plurality of second step surfaces  600  are arranged along the edge of the inner surface  200 . Specifically, a quantity of the plurality of second step surfaces  600  may be 3, 4, 5, 8, 10, 16, or the like. This is not specifically limited herein.  FIG.  3    only shows an example in which there are four second step surfaces  600 . This cannot be considered as a special limitation on this application. In some other embodiments,  FIG.  7    is a three-dimensional view of the glass cover plate  11  in the cover body structure  1  according to some other embodiments of this application. The quantity of the plurality of second step surfaces  600  is 16. 
     Both the second step surface  600  and the inner surface  200  face a side that is of a plane on which the inner surface  200  is located and that is away from a plane on which the outer surface  100  is located. In other words, that is, if a part of space located on the side that is of the plane on which the inner surface  200  is located and that is away from the plane on which the outer surface  100  is located is defined as an inner side space of the glass cover plate  11 , the second step surface  600  and the inner surface  200  are both opposite to the inner side space of the glass cover plate  11 . 
     The second step surface  600  has an outer edge disposed away from the center of the inner surface  200  and an inner edge disposed close to the center of the inner surface  200 . The outer edge of the second step surface  600  is connected to the edge of the first side surface  300  close to the inner surface  200 . The third side surface  700  is connected between the inner edge of the second step surface  600  and the inner surface  200 . A distance from the second step surface  600  to the outer surface  100  is less than a distance from the inner surface  200  to the outer surface  100 . That is, a distance from each part of the second step surface  600  to the outer surface  100  is less than the distance from the inner surface  200  to the outer surface  100 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 . 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600 , outer edges of the plurality of second step surfaces  600  are all connected to the first side surface  300 . Correspondingly, there are also a plurality of third side surfaces  700 , a quantity of the plurality of third side surfaces  700  is equal to a quantity of the plurality of second step surfaces  600 , the plurality of third side surfaces  700  are in a one-to-one correspondence to the plurality of second step surfaces  600 , and each third side surface  700  is connected between an inner edge of the second step surface  600  corresponding to the third side surface  700  and the inner surface  200 . In the embodiment shown in  FIG.  3   , there are four second step surfaces  600 , and there are also four third side surfaces  700 . In the embodiment shown in  FIG.  7   , there are  16  second step surfaces  600 , and there are also  16  third side surfaces  700 . A groove enclosed by the second step surface  600  and the third side surface  700  corresponding to the second step surface  600  includes, but is not limited to, a rectangular groove, a square groove, a semicircular groove, and a dovetail groove. This is not specifically limited herein. 
     The second step surface  600  may be a plane or a curved surface. This is not specifically limited herein. When the second step surface  600  is a plane, the second step surface  600  may be parallel to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The third side surface  700  may be a plane or a curved surface. This is not specifically limited herein. The third side surface  700  may be perpendicular to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The plastic edge portion  14  is further molded on the second step surface  600  and the third side surface  700  through an injection molding process. 
     In this way, on the one hand, a bonding area between the plastic edge portion  14  and the glass cover plate  11  can be increased by using the second step surface  600  and the third side surface  700 , thereby further increasing a bonding force between the plastic edge portion  14  and the glass cover plate  11  and improving the structural strength of the cover body structure  1 . On the other hand, the second step surface  600  and the third side surface  700  may further cooperate with positioning posts to position the glass cover plate  11  on the injection molding machine. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600  and a plurality of third side surfaces  700 , to enable the second step surfaces  600  and the third side surfaces  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the plurality of second step surfaces  600  include at least three second step surfaces  600  arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to the at least three second step surfaces  600  and respectively attaching side surfaces of the at least three positioning posts to third side surfaces  700  connected to the at least three second step surfaces  600 , to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. The shape of the positioning post on the injection molding machine is not limited to cylindrical, rectangular, or other regular or irregular profiling structures. 
     It should be noted that in the foregoing embodiment, when the shape of the glass cover plate  11  is a circular flat plate shape, the glass cover plate  11  can be positioned by using three positioning posts and one ejector rod. When the shape of the glass cover plate  11  is a square flat plate shape or a rectangular flat plate shape, the glass cover plate  11  can be positioned only if four positioning posts and one ejector rod are used. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
       FIG.  4    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  shown in  FIG.  3    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod. The plastic edge portion  14  has an inner surface  800 . The inner surface  800  of the plastic edge portion  14  refers to a surface of the plastic edge portion  14  facing the inside of the electronic device when the cover body structure  1  is used as a part of the housing of the electronic device. Positions on the inner surface  800  of the plastic edge portion  14  that correspond to the at least three second step surfaces  600  are provided with second positioning post pull-out holes  802 .  FIG.  5    is a cross-sectional view of the cover body structure  11  shown in  FIG.  4   . The second positioning post pull-out hole  802  extends along a direction perpendicular to the glass cover plate  11 , and the second step surface  600  and the third side surface  700  connected to the second step surface  600  form a partial inner surface region of the second positioning post pull-out hole  802 . 
       FIG.  6    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  shown in  FIG.  3    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. When the plastic edge portion  14  is switched to a state in which the glass cover plate  11  is clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite, the positioning of the glass cover plate  11  by using the at least three positioning posts and the ejector rod is canceled. In this way, no positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14  in the molded cover body structure  1 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , and the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 , to enable the second step surface  600  and the third side surface  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the second step surface  600  includes at least three step surface regions arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to the at least three step surface regions and respectively attaching side surfaces of the at least three positioning posts to partial regions of third side surfaces connected to the at least three step surface regions, to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, positions on the inner surface of the plastic edge portion  14  that correspond to the at least three step surface regions are provided with second positioning post pull-out holes. The second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate  11 , and the step surface region and a partial region of the third side surface connected to the step surface region form a partial inner surface region of the second positioning post pull-out hole. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite, no positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     The third implementation: The edge of the first side surface  300  close to the inner surface  200  is separated from at least a part of the edge of the inner surface  200  by using a middle surface. Specifically,  FIG.  8    is a schematic cross-sectional structural diagram of a cover body structure  1  according to some other embodiments of this application. The glass cover plate  11  further includes a second step surface  600  and a third side surface  700 . 
     In some embodiments, the second step surface  600  and the third side surface  700  are processed and molded by using a milling cutter on a computer numerical control (computer numerical control, CNC) machine tool. 
     The second step surface  600  is located outside an edge of the inner surface  200 . That is, the second step surface  600  is located on a side of the edge of the inner surface  200  away from a center of the inner surface  200 . 
     The second step surface  600  may be a relatively small surface located outside one side edge of the inner surface  200 , or may be a relatively large annular surface disposed around an edge circumference of the inner surface  200 . This is not specifically limited herein. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , there may be one or more second step surfaces  600 . This is not specifically limited herein. When there are a plurality of second step surfaces  600 , the plurality of second step surfaces  600  are arranged along the edge of the inner surface  200 . 
     In the embodiment shown in  FIG.  8   , the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 . This cannot be considered as a special limitation on this application. 
     Both the second step surface  600  and the inner surface  200  face a side that is of a plane on which the inner surface  200  is located and that is away from a plane on which the outer surface  100  is located. In other words, that is, if a part of space located on the side that is of the plane on which the inner surface  200  is located and that is away from the plane on which the outer surface  100  is located is defined as an inner side space of the glass cover plate  11 , the second step surface  600  and the inner surface  200  are both opposite to the inner side space of the glass cover plate  11 . 
     The second step surface  600  has an outer edge disposed away from the center of the inner surface  200  and an inner edge disposed close to the center of the inner surface  200 . The outer edge of the second step surface  600  is connected to the edge of the first side surface  300  close to the inner surface  200 . The third side surface  700  is connected between the inner edge of the second step surface  600  and the inner surface  200 . A distance from the second step surface  600  to the outer surface  100  is less than a distance from the inner surface  200  to the outer surface  100 . That is, a distance from each part of the second step surface  600  to the outer surface  100  is less than the distance from the inner surface  200  to the outer surface  100 . 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600 , outer edges of the plurality of second step surfaces  600  are all connected to the first side surface  300 . Correspondingly, there are also a plurality of third side surfaces  700 , a quantity of the plurality of third side surfaces  700  is equal to a quantity of the plurality of second step surfaces  600 , the plurality of third side surfaces  700  are in a one-to-one correspondence to the plurality of second step surfaces  600 , and each third side surface  700  is connected between an inner edge of the second step surface  600  corresponding to the third side surface  700  and the inner surface  200 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 . 
     The second step surface  600  may be a plane or a curved surface. This is not specifically limited herein. When the second step surface  600  is a plane, the second step surface  600  may be parallel to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The third side surface  700  may be a plane or a curved surface. This is not specifically limited herein. The third side surface  700  may be perpendicular to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The first ink layer  12  is further disposed on the second step surface  600 , the first glue layer  13  is further disposed on the first ink layer  12  on the second step surface  600 , and the plastic edge portion  14  is further molded on the first glue layer  13  on the second step surface  600  and the third side surface  700  through an injection molding process. 
     In this way, on the one hand, a bonding area between the plastic edge portion  14  and the glass cover plate  11  can be increased by using the second step surface  600  and the third side surface  700 , and a bonding force between the plastic edge portion  14  and the second step surface  600  in a unit area can be also increased by using the first ink layer  12  and the first glue layer  13  that are on the second step surface  600 , thereby further increasing a bonding force between the plastic edge portion  14  and the glass cover plate  11  and improving the structural strength of the cover body structure  1 . On the other hand, the second step surface  600  and the third side surface  700  may further cooperate with positioning posts to position the glass cover plate  11  on the injection molding machine. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600  and a plurality of third side surfaces  700 , to enable the second step surfaces  600  and the third side surfaces  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the plurality of second step surfaces  600  include at least three second step surfaces  600  arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to surfaces of the first glue layers  13  on the at least three second step surfaces  600  and respectively attaching side surfaces of the at least three positioning posts to third side surfaces  700  connected to the at least three second step surfaces  600 , to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, positions on the inner surface  800  of the plastic edge portion  14  that correspond to the at least three second step surfaces  600  are provided with second positioning post pull-out holes. The second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate  11 , and the surface of the first glue layer  13  on the second step surface  600  and the third side surface  700  connected to the second step surface  600  form a partial inner surface region of the second positioning post pull-out hole. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite, no positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , and the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 , to enable the second step surface  600  and the third side surface  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the second step surface  600  includes at least three step surface regions arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to surfaces of the first glue layers  13  on the at least three step surface regions and respectively attaching side surfaces of the at least three positioning posts to partial regions of third side surfaces connected to the at least three step surface regions, to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
       FIG.  9    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  in the cover body structure  1  shown in  FIG.  8    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod. Positions on the inner surface  800  of the plastic edge portion  14  that correspond to the at least three step surface regions are provided with second positioning post pull-out holes  802 . The second positioning post pull-out hole  802  extends along a direction perpendicular to the glass cover plate  11 , and the surface of the first glue layer  13  on the step surface region and a partial region of the third side surface connected to the step surface region form a partial inner surface region of the second positioning post pull-out hole  802 . 
       FIG.  10    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  in the cover body structure  1  shown in  FIG.  8    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. No positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     Embodiment 2:  FIG.  11    is a schematic cross-sectional structural diagram of a cover body structure  1  according to some other embodiments of this application. The edge of the first side surface  300  close to the outer surface  100  is connected to the edge circumference of the outer surface  100 . The glass cover plate  11  includes the outer surface  100 , the inner surface  200 , and the first side surface  300  located between the edge circumference of the outer surface  100  and the edge circumference of the inner surface  200 . In addition, the glass cover plate  11  further includes a second step surface  600  and a third side surface  700 . 
     In some embodiments, the second step surface  600  and the third side surface  700  are processed and molded by using a milling cutter on a computer numerical control (computer numerical control, CNC) machine tool. 
     The second step surface  600  is located outside an edge of the inner surface  200 . That is, the second step surface  600  is located on a side of the edge of the inner surface  200  away from a center of the inner surface  200 . 
     The second step surface  600  may be a relatively small surface located outside one side edge of the inner surface  200 , or may be a relatively large annular surface disposed around an edge circumference of the inner surface  200 . This is not specifically limited herein. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , there may be one or more second step surfaces  600 . This is not specifically limited herein. When there are a plurality of second step surfaces  600 , the plurality of second step surfaces  600  are arranged along the edge of the inner surface  200 . 
     In the embodiment shown in  FIG.  11   , the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 . This cannot be considered as a special limitation on this application. 
     Both the second step surface  600  and the inner surface  200  face a side that is of a plane on which the inner surface  200  is located and that is away from a plane on which the outer surface  100  is located. In other words, that is, if a part of space located on the side that is of the plane on which the inner surface  200  is located and that is away from the plane on which the outer surface  100  is located is defined as an inner side space of the glass cover plate  11 , the second step surface  600  and the inner surface  200  are both opposite to the inner side space of the glass cover plate  11 . 
     The second step surface  600  has an outer edge disposed away from the center of the inner surface  200  and an inner edge disposed close to the center of the inner surface  200 . The outer edge of the second step surface  600  is connected to the edge of the first side surface  300  close to the inner surface  200 . The third side surface  700  is connected between the inner edge of the second step surface  600  and the inner surface  200 . A distance from the second step surface  600  to the outer surface  100  is less than a distance from the inner surface  200  to the outer surface  100 . That is, a distance from each part of the second step surface  600  to the outer surface  100  is less than the distance from the inner surface  200  to the outer surface  100 . 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600 , outer edges of the plurality of second step surfaces  600  are all connected to the first side surface  300 . Correspondingly, there are also a plurality of third side surfaces  700 , a quantity of the plurality of third side surfaces  700  is equal to a quantity of the plurality of second step surfaces  600 , the plurality of third side surfaces  700  are in a one-to-one correspondence to the plurality of second step surfaces  600 , and each third side surface  700  is connected between an inner edge of the second step surface  600  corresponding to the third side surface  700  and the inner surface  200 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 . 
     The second step surface  600  may be a plane or a curved surface. This is not specifically limited herein. When the second step surface  600  is a plane, the second step surface  600  may be parallel to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The third side surface  700  may be a plane or a curved surface. This is not specifically limited herein. The third side surface  700  may be perpendicular to the inner surface  200  (or the outer surface  100 ), or may tilt relative to the inner surface  200  (or the outer surface  100 ). This is not specifically limited herein. 
     The first ink layer  12  is disposed on the second step surface  600 , the first glue layer  13  is disposed on the first ink layer  12  on the second step surface  600 , and the plastic edge portion  14  is molded on the first side surface  300 , the first glue layer  13  on the second step surface  600 , and the third side surface  700  through an injection molding process. 
     In this way, in the first aspect, because the plastic edge portion  14  is molded on the first side surface  300 , the first glue layer  13  on the second step surface  600 , and the third side surface  700  through an injection molding process, an outer surface of the plastic edge portion  14  can be continuously connected to the outer surface of the glass cover plate  11 , thereby ensuring the appearance delicacy of the cover body structure  1 . In the second aspect, both the second step surface  600  and the inner surface  200  face a side that is of a plane on which the inner surface  200  is located and that is away from a plane on which the outer surface  100  is located, the first ink layer  12  is disposed on the second step surface  600 , and the first glue layer  13  is disposed on the first ink layer  12  on the second step surface  600 , thereby facilitating the arrangement of the first ink layer  12  and the first glue layer  13  on the edge of the glass cover plate  11 . In the third aspect, the second step surface  600  and the third side surface  700  may further cooperate with positioning posts to position the glass cover plate  11  on the injection molding machine. 
     When the second step surface  600  is a relatively small surface located outside one side edge of the inner surface  200 , and there are a plurality of second step surfaces  600  and a plurality of third side surfaces  700 , to enable the second step surfaces  600  and the third side surfaces  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the plurality of second step surfaces  600  include at least three second step surfaces  600  arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to surfaces of the first glue layers  13  on the at least three second step surfaces  600  and respectively attaching side surfaces of the at least three positioning posts to third side surfaces  700  connected to the at least three second step surfaces  600 , to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, positions on the inner surface  800  of the plastic edge portion  14  that correspond to the at least three second step surfaces  600  are provided with second positioning post pull-out holes. The second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate  11 , and the surface of the first glue layer  13  on the second step surface  600  and the third side surface  700  connected to the second step surface  600  form a partial inner surface region of the second positioning post pull-out hole. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite, no positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     When the second step surface  600  is an annular surface disposed around the edge circumference of the inner surface  200 , and the third side surface  700  is also an annular surface disposed around the edge circumference of the inner surface  200 , to enable the second step surface  600  and the third side surface  700  to cooperate with positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the second step surface  600  includes at least three step surface regions arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by respectively attaching top surfaces of at least three positioning posts on the injection molding machine to surfaces of the first glue layers  13  on the at least three step surface regions and respectively attaching side surfaces of the at least three positioning posts to partial regions of third side surfaces connected to the at least three step surface regions, to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, positions on the inner surface  800  of the plastic edge portion  14  that correspond to the at least three step surface regions are provided with second positioning post pull-out holes. The second positioning post pull-out hole extends along a direction perpendicular to the glass cover plate  11 , and the surface of the first glue layer  13  on the step surface region and a partial region of the third side surface connected to the step surface region form a partial inner surface region of the second positioning post pull-out hole. 
     In the cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  when the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface and the inner surface of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite, no positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     Embodiment 3:  FIG.  12    is a schematic cross-sectional structural diagram of a cover body structure  1  according to some other embodiments of this application. The edge of the first side surface  300  close to the outer surface  100  is connected to the edge circumference of the outer surface  100 , and the edge of the first side surface  300  close to the inner surface  200  is connected to the edge circumference of the inner surface  200 . 
     The inner surface  200  includes an edge region A. The edge region A may be a relatively small region located on one side edge of the inner surface  200  or a relatively large annular region located around the edge circumference of the inner surface  200 . In the embodiment shown in  FIG.  12   , the edge region A is an annular region located around the edge circumference of the inner surface  200 . This cannot be considered as a special limitation on this application. 
     The first ink layer  12  is disposed at least on the edge region A. That is, the first ink layer  12  may be disposed only on the edge region A or disposed on other regions in addition to the edge region A. This is not specifically limited herein. 
     In the embodiment shown in  FIG.  12   , the first ink layer  12  is disposed on the entire inner surface  200  including the edge region A. In this case, if the cover body structure  1  is used as a front cover plate of the electronic device and a decorative cover of the camera module, a transparent ink layer needs to be selected as the first ink layer  12 . If the cover body structure  1  is used as a back cover of the electronic device, a light-proof ink layer such as a black ink layer, a color ink layer, or a white ink layer needs to be selected as the first ink layer  12 , to hide a circuit structure in the electronic device. 
     In some other embodiments, the cover body structure  1  is used as a decorative cover of the camera module. The first ink layer  12  is disposed on regions on the inner surface  200  other than a light entering region. The light entering region is used for ensuring a light entering amount of the camera module. In this embodiment, a light-proof ink layer such as a black ink layer, a color ink layer, or a white ink layer may be selected as the first ink layer  12 . 
     The first glue layer  13  is disposed on the first ink layer  12  on the edge region A. The plastic edge portion  14  is molded on the first side surface  300  and the first glue layer  13  on the edge region A through an injection molding process. 
     In this way, on the one hand, the integrity of the glass cover plate  11  can be ensured without processing a step surface on the glass cover plate  11 . On the other hand, the first side surface  300  and the inner surface  200  can cooperate with the positioning posts on the injection molding machine to position the glass cover plate  11 . 
     In the foregoing embodiment, to enable the first side surface  300  and the inner surface  200  to cooperate with the positioning posts on the injection molding machine to position the glass cover plate  11 , in some embodiments, the inner surface  200  includes at least three positioning regions B arranged evenly around the edge circumference of the inner surface  200 . In this way, the glass cover plate  11  can be fixed, by disposing step surfaces on edges of top surfaces of at least three positioning posts on the injection molding machine and side surfaces connected between the step surfaces and the top surfaces, attaching the step surfaces on the edges of the top surfaces of the at least three positioning posts to the at least three positioning regions B, and respectively attaching the side surfaces that are on the edges of the top surfaces of the at least three positioning posts and that are connected to the step surfaces to partial regions of the first side surface  300  connected to the at least three positioning regions B, to a position on a plane on which the glass cover plate is located. On this basis, an ejector rod is added on a side of the outer surface  100  of the glass cover plate  11  away from the inner surface  200 , and a top surface of the ejector rod is attached to the outer surface  100  of the glass cover plate  11  to fix the glass cover plate  11  to a position on a plane perpendicular to the plane on which the glass cover plate is located, thereby realizing positioning. Such a positioning manner is simple and easy to implement. 
     The plastic edge portion  14  may be molded on the edge of the glass cover plate  11  when the glass cover plate  11  is in a state of being positioned by using the at least three positioning posts and the ejector rod, or may be molded on the edge of the glass cover plate  11  after the glass cover plate  11  is positioned by using the at least three positioning posts and the ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. This is not specifically limited herein. 
       FIG.  13    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  in the cover body structure  1  shown in  FIG.  12    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod. Positions on an inner surface  800  of the plastic edge portion  14  that correspond to the at least three positioning regions B are provided with first positioning post pull-out holes  801 .  FIG.  14    is a schematic cross-sectional structural diagram of the cover body structure  1  shown in  FIG.  13   . The first positioning post pull-out hole  801  extends along a direction perpendicular to the glass cover plate  11 , and the surface of the first glue layer  13  on the positioning region B and a partial region of the first side surface  300  connected to the positioning region B form a partial inner surface region of the first positioning post pull-out hole  801 . 
       FIG.  15    is a three-dimensional view of a cover body structure  1  obtained after the plastic edge portion  14  is molded on the edge of the glass cover plate  11  in the cover body structure  1  shown in  FIG.  12    when the glass cover plate  11  is positioned by using at least three positioning posts and one ejector rod and then the glass cover plate  11  is switched to be clamped by the outer surface  100  and the inner surface  200  of the glass cover plate  11  by using a structure such as a vacuum sucker or ebonite. No positioning post pull-out hole exists on the inner surface  800  of the plastic edge portion  14 , thereby ensuring the surface integrity and structural strength of the cover body structure  1 . 
     In the cover body structure  1  shown in  FIG.  12   , a laser engraving surface or a step surface may be further disposed on the first side surface  300  of the glass cover plate  11  to increase a bonding area between the first side surface  300  and the plastic edge portion  14 , thereby further increasing the bonding strength between the plastic edge portion  14  and the glass cover plate  11 . 
     It should be noted that, in this embodiment of this application, an edge structure form of the glass cover plate  11  and disposition positions of the first ink layer  12 , the first glue layer  13 , and the plastic edge portion  14  are not limited to the foregoing embodiment 1, embodiment 2, and embodiment 3, and further include other feasible embodiments, as long as conditions that the first ink layer  12  is disposed at least on the edge of the glass cover plate  11 , the first glue layer  13  is disposed on the first ink layer  12  on the edge of the glass cover plate  11 , and the plastic edge portion  14  is molded at least on the first glue layer  13  on the edge of the glass cover plate  11  through an injection molding process are satisfied. This is not specifically limited herein. 
     Based on any one of the foregoing embodiments of the cover body structure  1 , the cover body structure  1  can form the front cover plate  10  of the electronic device shown in  FIG.  1   a    to  FIG.  1     c.  In this case, the plastic edge portion  14  is configured to meet 2.5D or 3D appearance design requirements for one side edge, two side edges, three side edge, or an edge circumference of the front cover plate  10 . For example, in the embodiments shown in  FIG.  2   a   ,  FIG.  5   ,  FIG.  8   , and  FIG.  11   , the outer surface of the plastic edge portion  14  is a curved surface and the inner surface is a plane. The plastic edge portion  14  of such a structure can meet 2.5D appearance design requirements of edges of the front cover plate  10 . The plastic edge portion  14  may also form the decorative cover  320  of the electronic device shown in  FIG.  1   a    to  FIG.  1     c.  In this case, the plastic edge portion  14  is disposed around the edge circumference of the glass cover plate  11 , and an accommodating groove  900  is enclosed between the plastic edge portion  14  and the glass cover plate  11  on a side of the inner surface  200  away from the outer surface  100 . The accommodating groove  900  is used for accommodating an object side end of the camera module  50 . 
     When the cover body structure  1  is used as the decorative cover  320  of the electronic device shown in  FIG.  1   a    to  FIG.  1     c,  for example, referring to  FIG.  16    being a schematic structural diagram of applying the cover body structure  1  shown in  FIG.  12    to the back cover  30  in the electronic device shown in  FIG.  1   a    to  FIG.  1     c,  the back cover body  310  includes an outer surface M and an inner surface N, the outer surface M of the back cover body  310  refers to a surface of the back cover body  310  facing the outside of the electronic device when the back cover is applied to the electronic device, the inner surface N of the back cover body  310  refers to a surface of the back cover body  310  facing the inside of the electronic device when the back cover is applied to the electronic device, and the opening  330  passes through the outer surface M and the inner surface N. 
     An orientation of the outer surface  100  of the glass cover plate  11  of the cover body structure  1  is the same as an orientation of the outer surface M of the back cover body  310 , and the plastic edge portion  14  of the cover body structure  1  is fixed to an edge circumference of the back cover body  310  at the opening  330 . 
     In the back cover  30  provided in the foregoing embodiment, because the back cover  30  includes the cover body structure  1  used as the decorative cover of the camera module, and the bonding strength between the glass cover plate  11  of the cover body structure  1  and the plastic edge portion  14  is better, the structural strength and stability of the back cover  30  can be ensured. 
     In the foregoing embodiment, the plastic edge portion  14  of the cover body structure  1  may be fixed to an edge circumference of the back cover body  310  at the opening  330  through a process such as gluing, engagement, or threaded connection. This is not specifically limited herein. 
     In some embodiments,  FIG.  17    is another schematic structural diagram of applying the cover body structure  1  shown in  FIG.  12    to the back cover  30  in the electronic device shown in  FIG.  1   a    to  FIG.  1     c.  The back cover further includes a second ink layer  2  and a second glue layer  3 . 
     The second ink layer  2  may be at least one of a black ink layer, a color ink layer, a white ink layer, or a transparent ink layer. This is not specifically limited herein. 
     The second ink layer  2  is disposed at least on an edge of the back cover body  310  at the opening  330 . That is, the second ink layer  2  may be disposed on only the edge of the back cover body  310  at the opening  330 , or the second ink layer  2  may be disposed on another region on the inner surface of the back cover body  310  in addition to the edge of the back cover body  310  at the opening  330 . 
     A part of the second ink layer  2  disposed on the edge of the back cover body  310  at the opening  330  may be disposed on a partial region of the edge of the back cover body  310  at the opening  330 , or may be disposed on an entire region of an edge circumference of the back cover body  310  at the opening  330 . This is not specifically limited herein. 
     The second ink layer  2  may be disposed at least on the edge of the back cover body  310  at the opening  330  through at least one of a glass direct molding process, a silk screen printing process, or a pad printing process. This is not specifically limited herein. 
     The second glue layer  3  is disposed on the second ink layer  2  on the edge of the back cover body  310  at the opening  330 . In some embodiments, the first glue layer  13  may be disposed on the second ink layer  2  on the edge of the back cover body  310  at the opening  330  through at least one of a blade coating process, a roll coating process, a dip coating process, or a spray coating process. This is not specifically limited herein. 
     The plastic edge portion  14  is further molded at least on the second glue layer  3  on the edge circumference of the back cover body  310  at the opening  330  through an injection molding process. 
     The second glue layer  3  is a glue layer viscous at least at an injection molding temperature of the plastic edge portion  14 . In some embodiments, the material of the second glue layer  3  is the same as the material of the first glue layer  13 . 
     The second ink layer  2  is an ink layer that can withstand the injection molding temperature of the plastic edge portion  14 . In some embodiments, the material of the second ink layer  2  is the same as the material of the first ink layer  12 . 
     In this way, the plastic edge portion  14  of the cover body structure  1  and the edge circumference of the back cover body  310  at the opening  330  can be molded into a whole through an injection molding process. The structure is simple with relatively high bonding strength while ensuring the appearance delicacy of the back cover. 
     This application further provides an electronic device. The electronic device may include, but is not limited to, a notebook computer, a tablet computer, a mobile phone, a watch, a pendant device or another wearable or micro device, a cellular phone, or a media player. 
       FIG.  18    is a schematic cross-sectional structural diagram of an electronic device according to some embodiments of this application. The electronic device includes the cover body structure  1  described in any one of the foregoing embodiments and a camera module  50  or includes the back cover  30  described in any one of the foregoing embodiments and a camera module  50 .  FIG.  18    shows only a schematic cross-sectional structural diagram of an electronic device including the back cover  30  described in any one of the foregoing embodiments and a camera module  50 . This cannot be considered as a special limitation on the structure of the electronic device. For example, the camera module  50  is a rear-facing camera module. The camera module  50  is disposed on an inner side of the cover body structure  1 , and a light-incident surface of the camera module  50  faces a glass cover plate  11  of the cover body structure  1 . The inner side of the cover body structure  1  refers to a side of the cover body structure  1  facing the inside of the electronic device when the cover body structure  1  is applied to the electronic device. 
     In the electronic device provided in the foregoing embodiment, because the electronic device includes the cover body structure  1  or the back cover  30  described in any one of the foregoing embodiments, the back cover  30  provided in any one of the foregoing embodiments includes the cover body structure  1  described in any one of the foregoing embodiments, and the structural strength and appearance delicacy of the cover body structure  1  are better, improvements in the structural strength and appearance delicacy of the electronic device are facilitated. 
     In the descriptions of this specification, the described specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of the embodiments or examples. 
     The foregoing embodiments are merely intended for describing the technical solutions of this application, but not for limiting this application. Although this application is described in detail with reference to the foregoing embodiments, a person of ordinary skill in the art is to understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of this application.