CN112468638A - Glass fiber shell with built-in antenna and preparation method thereof - Google Patents
Glass fiber shell with built-in antenna and preparation method thereof Download PDFInfo
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- CN112468638A CN112468638A CN202011334232.2A CN202011334232A CN112468638A CN 112468638 A CN112468638 A CN 112468638A CN 202011334232 A CN202011334232 A CN 202011334232A CN 112468638 A CN112468638 A CN 112468638A
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- glass fiber
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- fiber layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
- H04M1/185—Improving the rigidity of the casing or resistance to shocks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a glass fiber shell with a built-in antenna and a preparation method thereof, and the glass fiber shell comprises a first glass fiber layer, wherein a countersunk hole penetrates through the first glass fiber layer along the left-right direction, a connecting piece is arranged in the countersunk hole and is matched with the countersunk hole, the right end of the connecting piece is positioned in the right end part of the countersunk hole, a first coarsening treatment layer is arranged on the left end surface of the connecting piece, a first conductive layer is arranged on the first coarsening treatment layer, a first conductive layer is formed by metal spraying on the first coarsening treatment layer, a second glass fiber layer is arranged on the left side surface of the first conductive layer, the second glass fiber layer covers the first conductive layer, the first glass fiber layer and the connecting piece from left to right, and a contact structure is arranged on the right end surface of the connecting piece. The invention has the advantages of high strength, difficult deformation and the like.
Description
Technical Field
The invention belongs to the technical field of electronic equipment, and particularly relates to a glass fiber shell with a built-in antenna and a preparation method thereof.
Background
The antenna of the electronic equipment such as the existing mobile phone is usually arranged in the mobile phone, along with the increase of the functions of the mobile phone, the number of corresponding electronic components is more and more, the utilization rate of the internal space of the mobile phone reaches the limit, and along with the arrival of the 5G era, the number of the antenna is obviously increased, in order to meet the requirement of antenna design, the antenna is inevitably required to be arranged as far as possible from the internal metal parts, therefore, the mobile phone antenna is arranged outside the mobile phone shell, namely, the antenna is not arranged inside the mobile phone to become the mainstream, a method for preparing the antenna on the shell is appeared on the market, but the shell prepared by adopting the method is mostly made of plastic and other materials, the strength is small, and the deformation is easy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the glass fiber shell with the built-in antenna, which is high in strength and not easy to deform, and the preparation method of the glass fiber shell.
In order to solve the technical problems, the invention adopts the following technical scheme:
a glass fiber shell with an internal antenna is characterized in that: including first glass fiber layer, run through first glass fiber layer along left right direction on the first glass fiber layer and seted up the counter bore, install the connecting piece in the counter bore, connecting piece and counter bore looks adaptation, the right-hand member of connecting piece is located the right-hand member portion of counter bore, the left end of connecting piece is worn out first glass fiber layer left and is extended to the left side on first glass fiber layer and the left end extrusion of connecting piece and be the slice, be equipped with first alligatoring processing layer on the left end face of connecting piece, be equipped with first conducting layer on the first alligatoring processing layer, metal spraying forms first conducting layer on the first alligatoring processing layer, be equipped with second glass fiber layer on the left side of first conducting layer, second glass fiber layer covers at first conducting layer from left right side, on first glass fiber layer and the connecting piece, be equipped with the contact structure on the right-hand member face of connecting piece.
The connecting piece is a rivet, and the left end of the rivet is connected with the first conductive layer.
The first conductive layer is composed of one or more layers of metal particles or powder coatings.
The invention also discloses a preparation method of the glass fiber shell with the built-in antenna, which comprises the following steps:
s1, taking glass fiber cloth to manufacture a first glass fiber layer, punching the first glass fiber layer by using punching equipment, penetrating the first glass fiber layer, and forming a countersunk hole with a small left and a large right on the first glass fiber layer;
s2, taking a rivet, inserting the rivet into the countersunk hole of the first glass fiber layer in the S1 from right to left, positioning the rivet cap of the rivet in the right end part of the countersunk hole, and penetrating the rivet rod of the rivet through the countersunk hole from right to left to extend to the left side of the first glass fiber layer in the S1;
s3, extruding the rivet rod of the rivet extending to the left side of the first glass fiber layer in the S1 by utilizing extrusion equipment, wherein the left end part of the rivet rod of the rivet is extruded into a sheet shape;
s4, shielding partial areas on the left side surface and the right side surface of the first glass fiber layer and the left end part and the right side surface of the rivet in the S1, and exposing the areas needing spraying on the left side surface and the right side surface of the first glass fiber layer and the left end part of the rivet in the S1;
s5, processing a corresponding antenna pattern groove position on the left side surface of the rivet rod extruded into a sheet shape in the rivet in S3;
s6, performing surface treatment on the antenna groove to form a first coarsening treatment layer;
s7, spraying metal particles or powder on the first coarsening layer through a metal spraying technology to form the first conductive layer and enable the first conductive layer to be connected with the left side surface of the rivet rod, extruded into a sheet shape, of the rivet in the S3;
s8, removing the shielding in S4;
and S9, covering glass fiber cloth on the left side surface of the first conducting layer, the left side surface of the first glass fiber layer, the upper side surface and the lower side surface of the first conducting layer and the upper side surface and the lower side surface of the end part of one end, extending out of the first glass fiber layer, of the rivet rod, pressing to manufacture a second glass fiber layer, and cutting to obtain the glass fiber shell with the built-in antenna.
Preferably, the depth value of the antenna pattern groove in step S5 is 0.01 to 0.1 mm.
Preferably, the diameter of the metal particles in the step S7 is 2 to 100 μm.
Preferably, the metal particles or powder in step S7 are sprayed with one or more layers, and the thickness of the first conductive layer is 0.02-0.5 mm.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention utilizes a first glass fiber layer made of glass fiber cloth, then punches a hole on the first glass fiber layer to install a connecting piece, then forms an antenna by metal spraying, finally covers the glass fiber cloth to press a second glass fiber layer, and finally cuts the glass fiber layer into the glass fiber shell with the built-in antenna, and the invention made of the glass fiber cloth has the characteristics of high strength and difficult deformation, thereby meeting the market demand;
in conclusion, the invention has the advantages of high strength, difficult deformation and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of a method for manufacturing a glass fiber housing with an internal antenna according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the glass fiber housing with an internal antenna of the present invention is mainly made of plastic and other materials, and the housing made of the material is mainly suitable for electronic products such as mobile phones with low value, low strength, easy deformation, and high value in the market, and has high requirements for the housing, and the housing has high strength and is not easy to deform, and the housing comprises a first glass fiber layer 1, a countersunk hole is formed on the first glass fiber layer 1 along the left-right direction, a connecting piece 2 is installed in the countersunk hole, the connecting piece 2 is adapted to the countersunk hole, the form of the countersunk hole is not limited, the countersunk hole can be a single-headed countersunk hole or a double-headed countersunk hole, and any form of the countersunk hole is covered in the protection range of the present invention, and the right end of the connecting piece 2 is located in the right end portion of the countersunk hole, the left end of the connecting piece 2 penetrates through the first glass fiber layer 1 to the left of the first glass fiber layer 1 to extend to the left of the first glass fiber layer 1, the left end of the connecting piece 2 is extruded and formed into a sheet shape, the left end face of the connecting piece 2 is provided with a first coarsening processing layer 5, the first coarsening processing layer is provided with a corresponding antenna pattern groove position, the groove position has a certain depth which is usually 0.01-0.1mm lower than the left end face of the connecting piece 2, the groove position is filled up by a metal spraying technology to form a first conductive layer 3, the first coarsening processing layer 5 is provided with a first conductive layer 3, the first coarsening processing layer 5 is sprayed with metal to form the first conductive layer 3, the first conductive layer 3 can form connecting structures such as connecting wires, antennas and the like on the left side face of the connecting piece 2, namely the first conductive layer 3 is an antenna, the invention does not specifically limit the connecting circuit structure formed by the, the left side surface of the first conducting layer 3 is provided with the second glass fiber layer 4, the second glass fiber layer 4 covers the first conducting layer 3, the first glass fiber layer 1 and the connecting piece from left to right, namely the second glass fiber layer 4 is respectively connected with the left side surface of the first glass fiber layer 1, the upper side surface and the lower side surface of the first conducting layer 3 and the upper side surface and the lower side surface of the end part of the connecting piece 2 extending out of one end of the first glass fiber layer 1, and the connecting piece 2 is provided with the contact structure, so that the glass fiber cloth has the characteristics of high strength and difficult deformation, and the glass fiber cloth is composed of the first glass fiber layer 1, the second glass fiber layer 4 and other parts and has the characteristics of high strength and difficult deformation, and can meet the market requirements.
The connecting piece 2 is a rivet, two ends of the rivet are respectively connected with the first conducting layer and the contact structure, correspondingly, the connecting piece can also be other matched parts such as an insert, the rivet can be made of copper or copper alloy and the like, and at the moment, a new conducting layer does not need to be formed on the right end face of the connecting piece such as the rivet and the like and the connecting piece can be directly used as the contact structure for connection.
The contact structure comprises a second coarsening layer and a second conducting layer, the second coarsening layer is arranged on the inner end face of the communicating structure, the second conducting layer is positioned on the inner side face of the second coarsening layer, and the first conducting layer 3 and the second conducting layer are respectively composed of one or more layers of metal particles or powder coatings.
The first conductive layer 3 and the second conductive layer are respectively one or more of a zinc coating, a zinc alloy coating, a tin alloy coating, an aluminum alloy coating, a copper coating or a copper alloy coating.
As shown in fig. 2, the invention also discloses a method for preparing the glass fiber shell with the built-in antenna, which comprises the following steps:
s1, taking glass fiber cloth, manufacturing a first glass fiber layer, punching on the first glass fiber layer by using punching equipment, penetrating the first glass fiber layer, forming a countersunk hole with a small left and a large right on the first glass fiber layer, and carrying out a production process flow of the glass fiber cloth, namely mixing the glass fiber and the polypropylene fiber, opening, carding by sending into a carding machine, laying a net by using a lapping machine, then needling by using a needling machine set to obtain a semi-finished felt, rolling by using a flat hot press, carrying out press molding, and finally cutting into the glass fiber cloth;
s2, taking a rivet, inserting the rivet into the countersunk hole of the first glass fiber layer in the S1 from right to left, positioning the rivet cap of the rivet in the right end part of the countersunk hole, and penetrating the rivet rod of the rivet through the countersunk hole from right to left to extend to the left side of the first glass fiber layer in the S1;
s3, extruding the rivet rod of the rivet extending to the left side of the first glass fiber layer in the S1 by utilizing an extruding device, extruding the left end part of the rivet rod of the rivet into a sheet shape, wherein the rivet is dumbbell-shaped, when the connecting piece is an adaptive plug-in piece, one part of the plug-in piece is inserted into the counter bore from right to left, the other part of the plug-in piece is inserted into the counter bore from left to right and is connected with the adaptive plug-in piece of the part, the adaptive plug-in piece is the connecting piece, the effect of acting on the rivet in the invention is the same, correspondingly, in the following operation steps, the operations of shielding the left side surface of the plug-in piece and roughening the first roughening layer 5 are formed by roughening treatment, the specific process is the same as that of the left end surface of the rivet, the detailed description is omitted, and correspondingly, the effect of acting on the rivet by other materials by the connecting piece is the same, are intended to be covered by the scope of the present invention;
s4, shielding partial areas on the left side surface and the right side surface of the first glass fiber layer and the left end portion and the right side surface of the rivet in the S1, exposing areas needing spraying on the left side surface and the right side surface of the first glass fiber layer and the left end portion of the rivet in the S1, and adopting a mode of shielding treatment that a thin layer material is used for wrapping a shell, and removing the thin material corresponding to the areas needing metal spraying treatment through equipment such as a laser engraving machine and the like, so that the areas needing metal spraying are exposed;
s5, processing corresponding antenna pattern groove positions on the left side surface of the rivet rod extruded into a sheet shape in the rivet in S3, wherein the depth of the antenna pattern groove positions is 0.01-0.1 mm;
s6, performing surface treatment on the antenna groove position to form a first coarsening treatment layer 5;
when the right end face of the connecting piece cannot be directly used as a contact mechanism for connection, a contact structure can be formed on the right end face of the connecting piece, namely, a step S7 is added to form a second coarsening treatment layer on the right side face of the rivet cap of the rivet;
s8, spraying metal particles or powder on the first coarsened layer 5 through a metal spraying technology to form the first conductive layer 3, connecting the first conductive layer 3 with the left side surface of the rivet rod extruded into a sheet shape of the rivet in S3, wherein the thickness of the first conductive layer 3 is 0.02-0.5mm, the metal spraying technology comprises thermal spraying and cold spraying, the diameter of the metal particles is 2-100 μm, and the thermal spraying refers to a technology that powder or wire-shaped metal or nonmetal materials are heated to a molten or semi-molten state by a certain heat source (such as electric arc, plasma spraying or combustion flame, and the like), and then sprayed on the surface of a treated substrate at a certain speed by high-speed gas to deposit and form surface coatings with various functions; cold spraying means that metal particles are not melted in the whole spraying process, compressed air is utilized to accelerate the metal particles, the metal particles are flattened on the surface of a substrate and are firmly attached, in the embodiment, a conductive material is selected as a material of a coating layer, and a conductive layer is formed by spraying, in addition, different mixed materials can be further included in the material of the coating layer, so that the coating layer has one or more performances in the aspects of wear resistance, corrosion resistance, oxidation resistance, heat conduction and the like while obtaining the conductive performance;
then, step S9 is added, metal particles or powder are sprayed on the second roughened layer by a metal spraying technique to form a second conductive layer and the second conductive layer is connected to the right side of the rivet cap of the rivet, the thickness of the second conductive layer is 0.02-0.5mm, the second conductive layer can be formed by a metal spraying manner or by an LDS technique or a PDS technique, specifically, the LDS technique is a technique of using laser direct forming technique, i.e. using laser engraving technique to directly plate a metal antenna on the support, more specifically, using a laser engraving machine to form the second conductive layer on the second roughened layer, the PDS technique is a technique of coating a conductive material on the surface of the workpiece by a planar printing process, and then forming a conductive three-dimensional circuit by means of copper plating or multilayer silver paste printing, more specifically, forming the second conductive layer by copper plating or multilayer silver paste printing on the second roughened layer 6, similarly, the first conductive layer 3 (i.e., the antenna) may be formed by another process (e.g., LDS or PDS), which is provided for use in conjunction with the present invention;
s10, removing the shielding in S4, specifically removing the shielding jig or the wrapped thin-layer material used in the step S4;
s11, covering fiberglass cloth on the left side of the first conductive layer 3, the left side of the first fiberglass layer 1, the upper and lower sides of the first conductive layer 3, and the upper and lower sides of the end of the rivet stem protruding out of the first fiberglass layer 1, then pressing to prepare a second glass fiber layer, wherein the manufacturing process flow of the second glass fiber layer is introduced, the specific process is not repeated, after a new second glass fiber layer is prepared, cutting and reprocessing are carried out to obtain the glass fiber shell with the built-in antenna, when the glass fiber cloth is pressed, the glass fiber cloth has a melting process, the glass fiber material entering the melting state has certain fluidity, i.e. the glass fibre material entering the molten state will flow inside the covered press area, so that the press area is completely filled and the surface is flat.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A glass fiber shell with an internal antenna is characterized in that: including first glass fiber layer, run through first glass fiber layer along left right direction on the first glass fiber layer and seted up the counter bore, install the connecting piece in the counter bore, connecting piece and counter bore looks adaptation, the right-hand member of connecting piece is located the right-hand member portion of counter bore, the left end of connecting piece is worn out first glass fiber layer left and is extended to the left side on first glass fiber layer and the left end extrusion of connecting piece and be the slice, be equipped with first alligatoring processing layer on the left end face of connecting piece, be equipped with first conducting layer on the first alligatoring processing layer, metal spraying forms first conducting layer on the first alligatoring processing layer, be equipped with second glass fiber layer on the left side of first conducting layer, second glass fiber layer covers at first conducting layer from left right side, on first glass fiber layer and the connecting piece, be equipped with the contact structure on the right-hand member face of connecting piece.
2. The fiberglass housing of an internal antenna of claim 1, wherein: the connecting piece is a rivet, and the left end of the rivet is connected with the first conductive layer.
3. The fiberglass housing of an internal antenna of claim 2, wherein: the first conductive layer is composed of one or more layers of metal particles or powder coatings.
4. A preparation method of a glass fiber shell with a built-in antenna is characterized by comprising the following steps: the method comprises the following steps:
s1, taking glass fiber cloth, pressing the glass fiber cloth into a first glass fiber layer, punching the glass fiber layer by using punching equipment, penetrating the first glass fiber layer, and forming a countersunk hole with a small left and a large right on the first glass fiber layer;
s2, taking a rivet, inserting the rivet into the countersunk hole of the first glass fiber layer in the S1 from right to left, positioning the rivet cap of the rivet in the right end part of the countersunk hole, and penetrating the rivet rod of the rivet through the countersunk hole from right to left to extend to the left side of the first glass fiber layer in the S1;
s3, extruding the rivet rod of the rivet extending to the left side of the first glass fiber layer in the S1 by utilizing extrusion equipment, wherein the left end part of the rivet rod of the rivet is extruded into a sheet shape;
s4, shielding partial areas on the left side surface and the right side surface of the first glass fiber layer and the left end part and the right side surface of the rivet in the S1, and exposing the areas needing spraying on the left side surface and the right side surface of the first glass fiber layer and the left end part of the rivet in the S1;
s5, processing a corresponding antenna pattern groove position on the left side surface of the rivet rod extruded into a sheet shape in the rivet in S3;
s6, performing surface treatment on the antenna groove to form a first coarsening treatment layer;
s7, spraying metal particles or powder on the first coarsening layer through a metal spraying technology to form the first conductive layer and enable the first conductive layer to be connected with the left side surface of the rivet rod, extruded into a sheet shape, of the rivet in the S3;
s8, removing the shielding in S4;
and S9, covering glass fiber cloth on the left side surface of the first conducting layer, the left side surface of the first glass fiber layer, the upper side surface and the lower side surface of the first conducting layer and the upper side surface and the lower side surface of the end part of one end, extending out of the first glass fiber layer, of the rivet rod, pressing to manufacture a second glass fiber layer, and cutting to obtain the glass fiber shell with the built-in antenna.
5. The method for manufacturing a glass fiber housing of an internal antenna according to claim 4, wherein: the depth value of the antenna pattern groove in the step S5 is 0.01-0.1 mm.
6. The method for manufacturing a glass fiber housing of an internal antenna according to claim 4, wherein: the diameter of the metal particles in the step S7 is 2 to 100 μm.
7. The method for manufacturing a glass fiber housing of an internal antenna according to claim 4, wherein: and spraying one or more layers of metal particles or powder in the step S7 to form the first conductive layer with the thickness of 0.02-0.5 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334232.2A CN112468638A (en) | 2020-11-24 | 2020-11-24 | Glass fiber shell with built-in antenna and preparation method thereof |
| CN202110442747.2A CN112911049A (en) | 2020-11-24 | 2021-04-23 | Glass fiber shell with built-in antenna and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334232.2A CN112468638A (en) | 2020-11-24 | 2020-11-24 | Glass fiber shell with built-in antenna and preparation method thereof |
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| CN112468638A true CN112468638A (en) | 2021-03-09 |
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| CN202110442747.2A Pending CN112911049A (en) | 2020-11-24 | 2021-04-23 | Glass fiber shell with built-in antenna and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023232088A1 (en) * | 2022-06-02 | 2023-12-07 | 华为技术有限公司 | Rear casing of terminal device, terminal device, and manufacturing method for rear casing of terminal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416695A (en) * | 2019-08-13 | 2019-11-05 | 东莞美景科技有限公司 | Antenna structure of metal spraying and preparation method thereof |
| CN210224271U (en) * | 2019-08-13 | 2020-03-31 | 东莞美景科技有限公司 | Antenna structure for electronic equipment and electronic equipment |
| CN210576415U (en) * | 2019-12-17 | 2020-05-19 | 深圳市兴飞科技有限公司 | Smart mobile phone glass cover antenna arrangement structure and mobile phone |
| CN111954409B (en) * | 2020-08-13 | 2021-09-14 | 东莞美景科技有限公司 | Preparation method of shell with built-in antenna |
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- 2020-11-24 CN CN202011334232.2A patent/CN112468638A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023232088A1 (en) * | 2022-06-02 | 2023-12-07 | 华为技术有限公司 | Rear casing of terminal device, terminal device, and manufacturing method for rear casing of terminal device |
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| CN112911049A (en) | 2021-06-04 |
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