CN107896461B

CN107896461B - Shell, manufacturing method thereof and mobile terminal

Info

Publication number: CN107896461B
Application number: CN201711118323.0A
Authority: CN
Inventors: 唐义梅
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-11-13
Filing date: 2017-11-13
Publication date: 2020-09-08
Anticipated expiration: 2037-11-13
Also published as: CN107896461A

Abstract

The application provides a manufacturing method of a shell, which comprises the following steps: providing a shell base body; forming a substrate on the shell base body, wherein the substrate and the shell base body are arranged in a laminated mode; processing the shell body and the substrate to form an antenna micro-seam, wherein the cross section of the substrate at the bottom of the antenna micro-seam is convex in the middle and concave on two sides; filling sealing glue in the antenna micro-gap; and forming a sealing layer for sealing the antenna micro-seam. The application also provides a shell and a mobile terminal. The application can improve the sealing quality of the shell in the mobile terminal.

Description

Shell, manufacturing method thereof and mobile terminal

Technical Field

The application relates to the technical field of mobile terminals, in particular to a shell, a manufacturing method of the shell and a mobile terminal with the shell.

Background

At present, a micro-slit is always arranged on a shell to install a functional component or transmit optical signals, electric signals and the like. Based on this structure, in order to ensure the overall aesthetic appearance and the dustproof and waterproof performance of the case, it is necessary to seal the micro-gap by a filling medium. If the sealing process of the filling medium is poor, the sealing performance of the shell is reduced.

Disclosure of Invention

The application provides a shell, a manufacturing method thereof and a mobile terminal with the shell, so that the sealing quality of the shell in the mobile terminal is improved.

The application provides a manufacturing method of a shell, which comprises the following steps:

providing a shell base body;

forming a substrate on the shell base body, wherein the substrate and the shell base body are arranged in a laminated mode;

processing the shell body and the substrate to form an antenna micro-seam, wherein the cross section of the substrate at the bottom of the antenna micro-seam is convex in the middle and concave on two sides;

filling sealing glue in the antenna micro-gap;

and forming a sealing layer for sealing the antenna micro-seam.

The application provides a casing, the casing include the casing base member with the base of the range upon range of setting of casing base member, run through the casing base member just extends to the antenna micro-gap of base and fill in sealing layer in the antenna micro-gap, the base has the laminating the roof of sealing layer, the cross-section of roof is middle arch and both sides are sunken.

The application also provides a mobile terminal, which comprises the shell.

According to the shell, the manufacturing method of the shell and the mobile terminal, the antenna micro-gap is processed on the base and the shell base body which are arranged in a stacked mode, the cross section of the base at the bottom of the antenna micro-gap is in the shape of the middle protrusion and the two sides depression, after the antenna micro-gap is filled with the sealing glue, the sealing glue can be filled in the gap between the antenna micro-gap and the base preferentially, the problem that the sealing quality of the sealing layer is poor due to the fact that the sealing glue enters the gap after the antenna micro-gap is filled with the sealing glue, and air bubbles are generated in the sealing layer and the like is solved, and therefore the forming quality and the sealing quality of the sealing layer are improved; in addition, the cross section of the substrate is in a shape of a middle bulge and two sides of a recess, and the contact area between the sealing layer and the substrate can be increased, so that the attaching strength between the sealing layer and the substrate is increased, the sealing quality of the shell is improved, and the reliability of the mobile terminal is improved.

Drawings

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

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

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

Fig. 3 is a partially enlarged structural view of a housing in the prior art.

Fig. 4 is a schematic partial enlarged structural diagram of a housing according to an embodiment of the present application.

Fig. 5 is a schematic partial enlarged structural diagram of a housing according to an embodiment of the present application.

Fig. 6 is a flowchart of a method for manufacturing a housing according to an embodiment of the present disclosure.

Fig. 7 is a schematic structural diagram of step 101 of a housing manufacturing method according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of step 102 of a housing manufacturing method provided in an embodiment of the present application.

Fig. 9 is a schematic structural diagram of step 102 of a housing manufacturing method provided in an embodiment of the present application.

Fig. 10 is a schematic structural diagram of step 103 of a housing manufacturing method provided in an embodiment of the present application.

Fig. 11 is a schematic structural diagram of step 103a of a housing manufacturing method according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of step 103b of a housing manufacturing method according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of step 103b of a housing manufacturing method according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of a step 1032 of a housing manufacturing method provided in an embodiment of the present application.

Fig. 15 is a schematic structural diagram of step 104 of a method for manufacturing a housing according to an embodiment of the present application.

Detailed Description

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

In addition, the following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be used to practice the present application. Directional phrases used in this application, such as, for example, "top," "bottom," "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used for better and clearer illustration and understanding of the present application and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

The numerical range represented by "to" in the present specification means a range including numerical values before and after "to" as a minimum value and a maximum value, respectively. In the drawings, structures that are similar or identical are denoted by the same reference numerals.

Referring to fig. 1, fig. 1 is a mobile terminal 100 according to an embodiment of the present disclosure, where the mobile terminal 100 may be any device with communication and storage functions, for example: the system comprises intelligent equipment with a network function, such as a tablet computer, a mobile phone, an electronic reader, a remote controller, a Personal Computer (PC), a notebook computer, vehicle-mounted equipment, a network television, wearable equipment and the like.

Referring to fig. 1, the mobile terminal 100 includes a housing 110, and the housing 110 is used for encapsulating a functional device 130. The functional device 130 includes an antenna. The housing 110 is made of metal, and the metal housing 110 shields electromagnetic waves radiated by the antenna, so that the built-in antenna of the mobile terminal 100 cannot receive and transmit electrical signals. In order to solve the problem of shielding the metal case 110 of the mobile terminal 100 from electromagnetic waves, the antenna micro-gap 120 is processed on the metal case 110, and then the antenna micro-gap 120 is filled with an insulating medium to seal the metal case 110, so that the built-in antenna of the mobile terminal 100 radiates signals through the antenna micro-gap 120. However, in the process of forming the antenna micro-gap 120, the filling medium is not well combined with the inner wall of the antenna micro-gap 120, which may cause problems such as poor sealing or generation of bubbles, thereby affecting the overall strength and waterproof performance of the housing 110.

Referring to fig. 2, fig. 2 is a diagram illustrating a housing 110 according to an embodiment of the present disclosure, which can be used as a battery back case of the mobile terminal 100. The housing 110 includes a housing base 111, a base 112 stacked on the housing base 111, an antenna micro-gap 120 penetrating the housing base 111 and extending to the base 112, and a sealing layer 113 filled in the antenna micro-gap 120. The substrate 112 has a top wall 1121 that conforms to the sealing layer 113. The top wall 1121 has a cross section that is convex in the middle and concave in both sides.

In this embodiment, the sealing layer 113 is formed by filling a sealing glue into the antenna micro-gap 120 and curing the sealing glue.

In this embodiment, referring to fig. 3, the housing base 111 is made of metal, and the substrate 112 is made of injection molded plastic. Due to the unstable combination of plastic and metal, there is a high possibility that a gap 114 exists between the housing base 111 and the substrate 112. After the sealing glue is filled in the antenna micro-gap 120, the filling of the sealing glue is stopped, and the sealing glue is cured, and after the filling of the sealing glue is stopped, the sealing glue may enter the gap 114 between the housing base 111 and the substrate 112, so that defects such as bubbles are formed in the sealing layer 113.

By processing the antenna micro-seam 120 on the substrate 112 and the shell body 111 which are arranged in a stacked manner, and enabling the cross section of the substrate 112 at the bottom of the antenna micro-seam 120 to be in a shape of a convex middle part and concave two sides, after the antenna micro-seam 120 is filled with sealing glue, the sealing glue can be filled in a gap 114 between the antenna micro-seam 120 and the substrate 112 preferentially, so that the problem that the sealing quality of the sealing layer 113 is poor and the like due to the fact that the sealing glue enters the gap 114 after the antenna micro-seam 120 is filled with the sealing glue is solved, and the forming quality and the sealing quality of the sealing layer 113 are improved; in addition, the cross section of the substrate 112 is convex in the middle and concave in the two sides, and the contact area between the sealing layer 113 and the substrate 112 can be increased, so that the attaching strength between the sealing layer 113 and the substrate 112 is increased, the sealing quality of the shell 110 is improved, and the reliability of the mobile terminal 100 is improved.

In one possible embodiment, referring to fig. 4 and 5, the substrate 112 includes a first groove 1122 and a second groove 1123, and a protrusion 1124 formed between the first groove 1122 and the second groove 1123. The antenna micro-slot 120 includes a first side wall 1201 and a second side wall 1202 disposed opposite each other. The first groove 1122 is smoothly connected to the first sidewall 1201, and the second groove 1123 is smoothly connected to the second sidewall 1202. Since the first groove 1122 is smoothly connected to the first sidewall 1201 so that the gap 114 between the housing base 111 and the substrate 112 is exposed to the inner wall of the antenna micro-gap 120, the sealing glue can easily enter the gap 114 when the sealing glue is filled, thereby reducing the occurrence of defects such as air bubbles in the sealing layer 113 and improving the sealing quality of the housing 110.

Referring to fig. 6 to 7, fig. 6 is a method 10 for manufacturing a housing 110 according to an embodiment of the present disclosure. The manufacturing method of the shell comprises the following steps.

Step 101, providing a shell base 111.

In this embodiment, referring to fig. 7, the shell substrate 111 is first cut from the shell 110, and then is subjected to multiple stamping by a die to form a shell 110 with a uniform thickness, and then the shell 110 is subjected to machining, milling, grinding, and cutting by a Computer Numerical Control (CNC) machine to form the shell substrate 111. The housing base 111 is substantially in the form of a rectangular plate. The housing base 111 has a first surface 1111 and a second surface 1112 disposed opposite to the first surface 1111. The first surface 1111 and the second surface 1112 may be flat surfaces or arc surfaces. Wherein the first surface 1111 faces the functional device 130 in the housing 110, and the second surface 1112 faces the external environment.

Step 102, please refer to fig. 8 and 9, a substrate 112 is formed on the housing base 111, and the substrate 112 and the housing base 111 are stacked.

In this embodiment, a substrate 112 is molded on the first surface 1111 of the housing base 111. The base 112 and the housing base 111 are stacked. The substrate 112 is used to provide a supporting force when the antenna micro-slots 120 are cut on the housing base 111, so as to prevent the housing base 111 from bending and deforming.

In one embodiment, the substrate 112 is formed using an injection molding process. The molding process of the substrate 112 includes the following steps.

Step 1021, providing a mold. Referring to fig. 8, the mold includes an upper mold 151 and a lower mold 152. The upper mold 151 and the lower mold 152 correspond to the second surface 1112 and the first surface 1111, respectively.

Step 1022, placing the housing base 111 into the mold. The first surface 1111 of the housing base 111 is disposed on the lower mold 152, the second surface 1112 faces the upper mold 151, and a smaller gap 153 is reserved between the first surface 1111 and the lower mold 152.

Step 1023, a base 112 stock material is injected into the mold. The substrate 112 starting material is in a liquid state. The base 112 starting material is injected into the gap 153 between the first surface 1111 and the upper die 151.

In step 1024, please refer to fig. 9, the substrate 112 is formed. The upper mold 151 and the lower mold 152 are pressed against each other, the raw material of the substrate 112 is pressed to mold the substrate 112, and the substrate 112 is molded on the first surface 1111 of the housing base 111.

Step 103, please refer to fig. 10-14, the housing base 111 and the substrate 112 are processed to form the antenna micro-slot 120. The cross section of the substrate 112 at the bottom of the antenna micro-slot 120 is a middle protrusion 1124 and two side recesses.

In this embodiment, the housing base 111 is made of metal and is used for preparing a rear battery cover of the mobile terminal 100. The metal case 110 shields electromagnetic waves, so that the built-in antenna of the mobile terminal 100 cannot receive and transmit electric signals. In order to solve the problem of shielding electromagnetic waves by the metal case 110 of the mobile terminal 100, the antenna micro-slot 120 is formed on the metal case 110, so that the built-in antenna of the mobile terminal 100 radiates signals through the antenna micro-slot 120.

In this embodiment, referring to fig. 10, the housing base 111 is horizontally (referring to the drawing) placed on a computer numerical control machine, and the CNC milling cutter 155 is used to cut the antenna micro-seam 120 on the housing base 111. The milling cutter cuts from the second surface 1112 toward the first surface 1111, and the milling cutter 155 cuts through the housing base 111 and then cuts into the substrate 112 to form the antenna micro-slot 120 extending through the housing base 111 and into the substrate 112 as the substrate 112 is attached to the first surface 1111. It should be understood that, in the present embodiment, the milling cutter 155 cuts the housing base 111 by penetrating from the first surface 1111 toward the second surface 1112, instead of cutting the housing base 111 into two separate pieces. When cutting the plurality of antenna micro-slots 120, the substrate 112 may be used to support the housing base 111, and the substrate 112 keeps the cutting process between the adjacent antenna micro-slots 120 from bending and deforming.

In this embodiment, after the antenna micro-gap 120 is formed, the bottom of the antenna micro-gap 120 corresponding to the substrate 112 may have a shape of a middle protrusion 1124 and two side recesses.

In a first embodiment, referring to fig. 11-13, in the process of processing the housing base 111 and the substrate 112, the antenna micro-gap 120 may be formed by multiple cutting, which includes the following steps.

Step 103a, referring to fig. 11, the shell substrate 111 is cut by a milling cutter 156 to form the initial micro-gap 121. The initial micro-slits 121 extend through the housing base 111. By setting a cutting program, after the case base 111 is cut, cutting of the case base 111 is stopped, and an initial micro-crack 121 is formed on the case base 111. The initial micro-gap 121 extends only through the housing base 111, but not through the substrate 112.

Step 103b, referring to fig. 12 and 13, the substrate 112 is cut through the initial micro-slits 121. A first groove 1122 and a second groove 1123 are machined on the substrate 112, and a protrusion 1124 is formed between the first groove 1122 and the second groove 1123. In this step, the milling cutter 157 with a smaller cutting head size is replaced, the milling cutter passes through the initial micro-slit 121 to machine the substrate 112 and cut a first groove 1122 on the substrate 112, and then the milling cutter is controlled to machine a second groove 1123 on the other side of the substrate 112, and a protrusion 1124 is formed between the first groove 1122 and the second groove 1123.

In the second embodiment, in the process of processing the housing base 111 and the substrate 112, the antenna micro-gap 120 may be formed by one-time cutting, which specifically includes the following steps.

In step 1030, referring to fig. 14, a cutter is used to cut the housing base 111 and the substrate 112, and a first groove 1122 and a second groove 1123 and a protrusion 1124 between the first groove 1122 and the second groove 1123 are formed on the substrate 112.

In one embodiment, step 1030 includes the following steps.

Step 1031, providing a cutter 158, wherein the cutter 158 is a circular blade, and the section of the tool tip of the cutter 158 is in a shape of bulges at two sides and a concave middle part.

And 1032, vertically placing the cutter 158 and the shell base body 111, controlling the cutter 158 to rotate at a high speed and cutting the shell base body 111 and the substrate 112. The cutter 158 cuts the housing base 111 and then cuts into the substrate 112.

Step 1033, after the tip of the tool 158 cuts into the substrate 112, the tool 158 is controlled to stop cutting. Since the cross section of the cutting tip of the cutting tool 158 is convex at two sides and concave at the middle, the cutting tool 158 forms two grooves, i.e., a first groove 1122 and a second groove 1123, on the substrate 112.

In this embodiment, the cutting process of the antenna micro-gap 120 can be completed at one time by using the cutter 158 having the section of the cutter point with the protrusions 1124 at both sides and the recess in the middle, thereby simplifying the process and improving the manufacturing efficiency of the housing 110.

In one embodiment, after the step 103 of processing the housing body 111 and the substrate 112 to form the antenna micro-gap 120, the first groove 1122 is smoothly connected to the inner wall of one side of the initial micro-gap 121, and the second groove 1123 is smoothly connected to the inner wall of the other side of the initial micro-gap 121.

And 104, filling sealing glue in the antenna micro-gap 120.

In one embodiment, referring to fig. 2, the step 104 of filling the antenna micro-gap 120 with the sealing glue includes:

step 1041, filling a first sealing glue in the antenna micro-gap 120. The first sealing glue fills the first groove 1122 and the second groove 1123.

1042, curing the first sealing glue, and forming a first sealing layer 1131. The first sealing layer 1131 covers the substrate 112.

In this embodiment, after the antenna micro-gap 120 is filled with the sealing glue, the sealing glue may be preferentially filled in the gap 114 between the antenna micro-gap 120 and the substrate 112, so as to reduce the problem that the sealing quality of the sealing layer 113 is poor due to bubbles generated in the sealing layer 113 after the sealing glue is filled in the antenna micro-gap 120 and enters the gap 114, and the like, thereby improving the molding quality of the sealing layer 113, further improving the sealing quality of the housing 110, and improving the reliability of the mobile terminal 100.

In one embodiment, referring to fig. 15, the step 104 of filling the antenna micro-gap 120 with the first sealing glue further includes:

step 1043, filling a second sealing glue on the first sealing layer 1131.

Step 1044 of curing the second sealing glue, and forming a second sealing layer 1132 to fill the antenna micro-gap 120.

In this embodiment, after the antenna micro-gap 120 is filled with the first sealing glue, the first sealing glue is filled in the gap 114 between the antenna micro-gap 120 and the substrate 112, the formed first sealing layer 1131 may seal the gap 114 between the antenna micro-gap 120 and the substrate 112, and then the first sealing layer 1131 is filled with the second sealing glue to form the second sealing layer 1132, and the second sealing layer 1132 fills the antenna micro-gap 120. The problem that the sealing quality of the sealing layer 113 is poor due to bubbles generated in the sealing layer 113 caused by the fact that the sealing glue enters the gap 114 after filling the antenna micro-gap 120 can be solved, so that the molding quality of the sealing layer 113 is improved, the sealing quality of the shell 110 is improved, and the reliability of the mobile terminal 100 is improved.

In this embodiment, the first sealing glue and the second sealing glue may be made of the same or different materials.

Optionally, the viscosity of the first sealing glue may be less than the viscosity of the second sealing glue. The first sealing glue has better fluidity, so that the first sealing glue can flow into the gap 114 between the housing base 111 and the substrate 112 after being filled in the antenna micro-gap 120, so as to reduce the defects of air bubbles, poor sealing, glue leakage and the like formed in the sealing layer 113.

In other embodiments, after the second sealing layer 1132 is formed, the antenna micro-gap 120 may be filled after the sealing glue is filled for multiple times and cured for multiple times.

Optionally, the second sealing glue includes a coloring material, and the coloring material makes the second sealing glue appear white, gold, silver, and the like, and after the second sealing layer 1132 is formed, the second sealing layer 1132 forms a colored sealing tape, which can play a role of marking and decorating.

And 105, forming a sealing layer 113, and sealing the antenna micro-gap 120.

Optionally, in step 105, the first sealing glue may be cured by a heat curing process or an ultraviolet light curing process. In the process of curing the first sealing glue by a heating and curing process, the temperature of the heat curing may be 80-100 ℃, and a lower temperature is selected as far as possible for curing, so as to avoid that the first sealing glue cracks or shrinks or deforms or separates from the inner side wall of the antenna micro-gap 120 due to an excessively high curing temperature. Optionally, the heat curing time may be 0.5 to 2 hours.

Step 106, grinding the shell body 111, and removing the overflowing sealing glue to enable the sealing layer 113 to be flush with the surface of the shell body 111.

In summary, although the present application has been described with reference to the preferred embodiments, the present application is not limited to the preferred embodiments, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application is defined by the appended claims.

Claims

1. A shell manufacturing method is characterized by comprising the following steps:

providing a shell base body;

processing the shell body and the substrate to form an antenna micro-seam, wherein a first groove and a second groove are formed on the substrate, a bulge is formed between the first groove and the second groove, and the cross section of the substrate at the bottom of the antenna micro-seam is convex in the middle and concave on two sides;

filling sealing glue in the antenna micro-seam, wherein the sealing glue is filled in the joint of the antenna micro-seam between the edge of the shell body and the substrate, so that bubbles generated in the sealing layer due to the fact that the sealing glue enters the gap of the joint after filling the antenna micro-seam are reduced;

forming a sealing layer for sealing the antenna micro-gap;

wherein, fill sealed glue in the antenna micro-gap, include:

filling first sealing glue in the antenna micro-gap, wherein the first sealing glue is filled in the first groove and the second groove;

curing the first sealing glue, and forming a first sealing layer, wherein the first sealing layer covers the substrate;

filling second sealing glue on the first sealing layer;

curing the second sealing glue, and forming a second sealing layer to fill the antenna micro-gap;

wherein the viscosity of the first sealing glue is less than the viscosity of the second sealing glue.

2. The method of claim 1, wherein the step of processing the housing base and the substrate to form the antenna micro-slot comprises:

cutting the shell substrate to form initial micro-seams, wherein the initial micro-seams penetrate through the shell substrate;

cutting the substrate through the initial micro-slit to form a first groove and a second groove on the substrate, wherein a protrusion is formed between the first groove and the second groove.

3. The method of claim 1, wherein the step of processing the housing base and the substrate to form the antenna micro-slot comprises:

and cutting the shell body and the substrate by using a cutter, and forming a first groove and a second groove and a bulge positioned between the first groove and the second groove on the substrate.

4. The method of manufacturing a housing according to claim 3, wherein the step of cutting the housing base and the substrate using a cutter includes:

providing a cutter, wherein the section of a cutter point of the cutter is in a shape of protruding on two sides and sunken in the middle;

controlling the cutter to cut off the shell matrix and then cut into the substrate;

and controlling the cutter to stop cutting.

5. The method for manufacturing a housing according to claim 2, wherein after the step of processing the housing base and the substrate to form the antenna micro-gap, the first groove is smoothly connected to an inner wall of one side of the initial micro-gap, and the second groove is smoothly connected to an inner wall of the other side of the initial micro-gap.

6. A shell is characterized by comprising a shell body, a substrate, an antenna micro-gap and a sealing layer, wherein the substrate is stacked on the shell body, the antenna micro-gap penetrates through the shell body and extends to the substrate, the sealing layer is filled in the antenna micro-gap, the substrate is provided with a top wall attached to the sealing layer, the cross section of the top wall is convex in the middle and concave on two sides, the substrate comprises a first groove, a second groove and a bulge formed between the first groove and the second groove, first sealing glue is filled in the first groove and the second groove, the first sealing glue is cured to form a first sealing layer, and the first sealing layer covers the substrate; the first sealing layer is also filled with second sealing glue, and the second sealing glue is cured to form a second sealing layer and fills the antenna micro-gap; wherein the viscosity of the first sealing glue is less than the viscosity of the second sealing glue.

7. The housing of claim 6 wherein the antenna slit includes first and second oppositely disposed sidewalls, the first recess being smoothly connected to the first sidewall and the second recess being smoothly connected to the second sidewall.

8. A mobile terminal characterized in that it comprises a housing according to claim 6 or 7.