CN110072331B

CN110072331B - Shielding grounding structure and terminal equipment

Info

Publication number: CN110072331B
Application number: CN201910387851.9A
Authority: CN
Inventors: 张洲川
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-03-27
Anticipated expiration: 2039-05-10
Also published as: CN110072331A

Abstract

The application relates to the technical field of electronic product manufacturing, and provides a shielding grounding structure and terminal equipment, wherein the shielding grounding structure is used for electrically connecting a printed circuit board and a metal frame body and comprises a shielding grounding unit; the shielding grounding unit comprises a shielding cover and an elastic sheet part, and the shielding cover and the elastic sheet part are integrally formed; the shielding cover is used for being connected with the printed circuit board, and the printed circuit board is electrically connected with the metal frame body through the elastic piece part, so that the printed circuit board is electrically conducted with the metal frame body; the shielding cover and the elastic sheet part are integrally formed, so that the elastic sheet part can be formed simultaneously when the shielding cover is manufactured, the material quantity is reduced, and the manufacturing cost is favorably reduced; because printed circuit board passes through spring plate portion and metal framework electric connection, consequently avoided direct extrusion printed circuit board at the connection-process to can not cause the harm to printed circuit board.

Description

Shielding grounding structure and terminal equipment

Technical Field

The present application relates to the field of electronic product manufacturing technologies, and in particular, to a shielding ground structure and a terminal device.

Background

A Printed Circuit Board (PCB) is an important electronic component, which is a support for electronic components and a carrier for electrical connection, and the electronic components are mounted on the PCB to perform specific functions, such as a computer motherboard, a terminal device circuit board, and a signal transmitting and receiving circuit board. The PCB board on which the electronic components are mounted functions as an integral structure, but it essentially includes a plurality of different signal units, each of which is mounted on a different area of the PCB board and performs a different function.

When the PCB is applied to a mobile device, in order to ensure good operation, the PCB needs to be in contact with the metal middle frame to achieve grounding, thereby playing roles of preventing static electricity and improving stability. However, at present, the PCB and the metal middle frame are grounded through a specially arranged spring plate, which results in high material cost.

Disclosure of Invention

An object of this application is to provide a shielding ground structure to PCB board and metal center need lead to the technical problem that the material cost is high through the shell fragment ground connection that sets up specially among the solution prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the shielding grounding structure is used for electrically connecting a printed circuit board and a metal frame and comprises a shielding grounding unit;

the shielding grounding unit comprises a shielding cover and an elastic sheet part, and the shielding cover and the elastic sheet part are integrally formed;

the shielding case is used for being connected with the printed circuit board, and the printed circuit board passes through the spring piece part with metal framework electric connection.

In one embodiment, the shielding cover is provided with an accommodating through groove, and the elastic piece part is arranged in the accommodating through groove.

In one embodiment, the elastic piece portion includes a connecting portion and a cantilever elastic leg, the connecting portion is connected to the shielding case, the cantilever elastic leg extends outward from the connecting portion, and the cantilever elastic leg is electrically connected to the metal frame.

In one embodiment, a side surface of the cantilever spring foot facing the metal frame body is provided with a convex point.

In one embodiment, the number of the cantilever spring feet is two, and the two cantilever spring feet extend outwards and oppositely from the connecting part to form a spring foot through hole.

In one embodiment, the shielding ground structure further includes a locking unit, and the locking unit is used for locking the printed circuit board, the cantilever spring leg and the metal frame.

In one embodiment, the locking unit comprises a screw, and the screw penetrates through the printed circuit board, the spring pin through hole and the metal frame body.

The present application further provides a terminal device, which includes a printed circuit board, a metal frame and the shielding grounding structure.

In one embodiment, the printed circuit board is connected to the shield can of the shield ground structure by soldering.

In one embodiment, the terminal device is a mobile phone, and the metal frame body is a mobile phone middle frame.

The application provides a shielding ground structure's beneficial effect lies in at least: shield cover and shell fragment portion integrated into one piece, consequently can the simultaneous molding shell fragment portion when the preparation shield cover, reduced material quantity, reduced the preparation process simultaneously, be favorable to reducing the cost of manufacture. Simultaneously, because shield cover and shell fragment portion integrated into one piece for inside the clearance transfer of shell fragment portion and shield cover has promoted space utilization. Moreover, because printed circuit board passes through spring plate portion and metal framework electric connection, consequently avoided direct extrusion printed circuit board at the connection-process to can not cause the harm to printed circuit board.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions 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 without creative efforts.

Fig. 1 is a schematic structural diagram of a shielding ground unit in a shielding ground structure provided in an embodiment of the present application;

FIG. 2 is a partially enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic cross-sectional structure diagram of a shielding ground structure provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. When an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly disposed on the other element. The terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positions based on those shown in the drawings, and are for convenience of description only and should not be construed as limiting the technical solution.

Referring to fig. 1 and fig. 3, the present embodiment provides a shielding grounding structure 10 for electrically connecting a printed circuit board 20 and a metal frame 30, including a shielding grounding unit 11; the shielding grounding unit 11 comprises a shielding cover 111 and an elastic sheet part 112, and the shielding cover 111 and the elastic sheet part 112 are integrally formed; the shielding cover 111 is used for electrically connecting with the printed circuit board 20, and the elastic sheet portion 112 is electrically connected with the metal frame 30, so that the printed circuit board 20 can be electrically connected with the metal frame 30 through the elastic sheet portion 112, and the printed circuit board 20 and the metal frame 30 are electrically conducted. It should be understood that the shield 111 and the spring part 112 are made of conductive material, such as metal.

In one embodiment, the shield ground structure 10 may be applied in a variety of devices, such as mobile terminal devices, wherein the structure of the shield enclosure 111 is adapted to the structure of the printed circuit board 20.

The printed circuit board 20 is integrated with a plurality of electronic components, which are easy to generate electromagnetic interference during working, thereby causing disorder of the whole device function and failure of normal working. Therefore, in order to avoid mutual interference between electronic components, the shielding cover 111 is disposed on the surface of the printed circuit board 20 in the present embodiment, and the shielding cover 111 can effectively shield electromagnetic signals. Meanwhile, in order to further improve the anti-static effect of the printed circuit board 20 and improve the stability, the printed circuit board 20 needs to be grounded, so that the static electricity on the printed circuit board 20 can be conducted rapidly.

When grounding the printed circuit board 20, the following methods can be adopted:

(1) the shell is grounded through a conventional elastic sheet, wherein the elastic sheet is fixedly connected with the printed circuit board through welding and is electrically communicated with the printed circuit board, and the elastic sheet is electrically connected with the shell through a contact part of the elastic sheet, so that the printed circuit board and the shell are grounded. However, when the conventional elastic sheet is grounded, an area needs to be occupied separately, so that the space utilization rate is reduced, and meanwhile, the conventional elastic sheet needs to consume extra materials, processing cost and the like, so that the cost is increased.

(2) The printed circuit board is directly pressed and grounded through the screw, and is pressed and contacted with the shell through the pressing effect of the screw, so that the printed circuit board is conducted with the shell. However, the mode of adopting the screw pressfitting has the unstable problem of contact, and the reliability is not high, leads to printed circuit board damage with the direct pressfitting of printed board and casing simultaneously easily.

The present embodiment provides a completely different way to electrically connect the printed circuit board 20 and the metal frame 30, so as to ground the printed circuit board 20. The embodiment provides a shielding grounding structure 10, wherein the shielding cover 111 and the elastic sheet part 112 are integrally formed, so that the elastic sheet part 112 can be simultaneously formed while the shielding cover 111 is manufactured, the number of materials is reduced, the manufacturing processes are reduced, and the manufacturing cost is favorably reduced. Meanwhile, as the shielding case 111 and the elastic sheet part 112 are integrally formed, the gap between the elastic sheet part 112 and the shielding case 111 is transferred to the inside of the shielding case 111, and the space utilization rate is improved. Meanwhile, since the printed circuit board 20 is electrically connected to the metal frame 30 through the elastic piece portion 112, the printed circuit board 20 is prevented from being directly pressed during the connection process, so that the printed circuit board 20 is not damaged.

Referring to fig. 1 and fig. 2, in an embodiment, the printed circuit board 20 has a through hole, the shielding cover 111 has a receiving through groove 1110, the position of the receiving through groove 1110 corresponds to the position of the through hole on the printed circuit board 20, and the elastic sheet portion 112 is disposed in the receiving through groove 1110. In a specific application, the receiving through groove 1110 is located at an edge of the shielding can 111, for example, a notch may be formed at the edge of the shielding can 111. The cross-sectional shape of the receiving through groove 1110 may be set as required, and may be, for example, a semicircular shape, a semi-elliptical shape, or a rectangular shape, which is not limited herein, as long as the elastic sheet portion 112 can be completely received. Through setting up the holding through groove 1110, can play good holding effect to shell fragment portion 112, shell fragment portion 112 need not to occupy extra space, has promoted space utilization. The elastic sheet part 112 can be disposed on one side of the accommodating through groove 1110 close to the metal frame 30, which is beneficial for the close attachment of the elastic sheet part 112 and the metal frame 30 during connection, so that the connection is more stable. Of course, the elastic sheet portion 112 may be disposed at other positions in the accommodating through groove 1110, which is not limited herein.

Referring to fig. 1 and fig. 2, the elastic piece portion 112 further includes a connecting portion 1121 and a cantilever elastic leg 1122, the connecting portion 1121 is connected to the shielding shell 111, the cantilever elastic leg 1122 extends outward from the connecting portion 1121, and the cantilever elastic leg 1122 is used for electrically connecting to the metal frame 30. The free end of the cantilever spring foot 1122 is in a suspended state and has an elastic force, so that the cantilever spring foot 1122 provides a resilient force when contacting the metal frame 30, so that the cantilever spring foot is fully contacted with the metal frame 30 to ensure stable connection. Of course, the free end of the cantilever spring foot 1122 may be located in the accommodating through groove 1110, or may extend out of the accommodating through groove 1110, which is not limited herein.

In one embodiment, the number of the cantilever spring feet 1122 is one, and a spring foot through hole 1123 is formed in the middle of the cantilever spring foot 1122. The shape of the arm spring 1122 may be set as needed, and may be, for example, a circular ring shape, a square shape, or the like, or the shape of the spring through-hole 1123 may be a circular shape, a rectangular shape, or the like.

Referring to fig. 2, in an embodiment, the number of the cantilever spring legs 1122 is two, and the two cantilever spring legs 1122 extend outward from the connecting portion 1121 to form spring leg through holes 1123, at which time the free ends of the two cantilever spring legs 1122 can extend toward each other to be in contact with each other or have a certain distance therebetween, and at this time, the two cantilever spring legs 1122 can form a ring-like structure.

Referring to fig. 2, in order to further increase the connection tightness between the cantilever spring foot 1122 and the metal frame 30, a protruding point 1124 is further disposed on a side surface of the cantilever spring foot 1122 facing the metal frame 30, and the number and the position of the protruding point 1124 may be set according to requirements, for example, the protruding point 1124 may be disposed at a free end of the cantilever spring foot 1122, or may be disposed at an end of the cantilever spring foot 1122 close to the connection portion 1121, and the number of the protruding points 1124 may be one, two, four or more. By providing the bumps 1124, the cantilever spring feet 1122 can be more fully contacted with the metal frame 30, and the connection is more stable.

Referring to fig. 3, in one embodiment, the shielding ground structure 10 further includes a locking unit 12, and the locking unit 12 is used for locking the printed circuit board 20, the cantilever spring foot 1122 and the metal frame 30. The locking mode of the locking unit 12 can be determined according to the requirement, for example, the locking unit 12 includes a screw, a connecting hole is formed in a position of the metal frame 30 corresponding to the through hole of the printed circuit board 20, and the screw can sequentially pass through the through hole of the printed circuit board 20, the spring pin through hole 1123 and the connecting hole of the metal frame 30, so that the remaining metal frames 30 of the printed circuit board 20 can be tightly connected together, and the requirement on the manufacturing size of the screw is not high. Meanwhile, the cantilever spring foot 1122 is arranged between the cantilever spring foot 1122 and the metal frame 30, so that the cantilever spring foot 1122 and the metal frame 30 are mutually extruded in the pressing process, the printed circuit board 20 cannot be directly extruded, and the printed circuit board 20 is prevented from being damaged due to extrusion. Moreover, because the spring pin through hole 1123 can be an annular spring plate or a similar annular spring plate, the anti-loosening performance of the screw can be effectively improved when the spring pin through hole is matched and connected with the screw. Of course, in other embodiments, the locking unit 12 may have other forms, and is not limited to the above-mentioned screw, and is not limited herein.

In one embodiment, when the free ends of the two cantilever spring legs 1122 extend to a certain distance, the diameter of the spring leg through hole 1123 may be slightly smaller than the diameter of the screw, and when the screw passes through the spring leg through hole 1123, the two cantilever spring legs 1122 deform outwards due to the acting force applied by the screw, and the resilience force generated by the two cantilever spring legs 1122 can clasp the screw, so that the connection between the two cantilever spring legs 1122 and the screw is more stable. Of course, in other embodiments, the diameter of the spring foot through hole 1123 may be larger than the diameter of the screw, and is not limited herein.

The shielding grounding structure 10 provided by the present embodiment has at least the following beneficial effects:

(1) the shielding cover 111 and the elastic sheet part 112 are integrally formed, so that the elastic sheet part 112 can be formed simultaneously when the shielding cover 111 is manufactured, the material quantity is reduced, the manufacturing procedures are reduced, and the manufacturing cost is reduced.

(2) Because shield cover 111 and shell fragment portion 112 integrated into one piece for the clearance of shell fragment portion 112 and shield cover 111 shifts inside shield cover 111, has promoted space utilization.

(3) Because the printed circuit board 20 is electrically connected with the metal frame 30 through the elastic piece portion 112, the printed circuit board 20 is prevented from being directly extruded in the connection process, and the printed circuit board 20 is not damaged.

(4) The provision of the protruding points 1124 on the cantilever spring legs 1122 of the spring portion 112 makes the contact between the cantilever spring legs 1122 and the metal frame 30 more sufficient, and the connection is more stable.

(5) By adopting a screw compression type connection mode, the contact with the metal frame body 30 can be ensured, and meanwhile, the requirement on the manufacturing size of the screw is not high.

(6) The spring pin through hole 1123 can be an annular spring plate or a similar annular spring plate, and can effectively improve the anti-loosening performance of the screw when being matched and connected with the screw.

Referring to fig. 3, the present embodiment is further directed to a terminal device 1, which includes a printed circuit board 20, a metal frame 30 and the shielding grounding structure 10, wherein the printed circuit board 20 is electrically connected to the metal frame 30 through an elastic sheet portion 112 of the shielding grounding structure 10. The printed circuit board 20 is connected to the shielding cover 111 of the shielding ground structure 10 by soldering, so as to ensure that the shielding cover 111 can play a good role in preventing electromagnetic interference with the printed circuit board 20. The printed circuit board 20 may integrate electronic components such as a processor, a storage unit, a power management module, and a baseband chip of the terminal device 1. Of course, the terminal device 1 may also include other components, such as a battery, a microphone, and electronic components such as a camera assembly, which are not listed completely here. Since the terminal device 1 adopts the shielding grounding structure 10, it has good electrostatic and electromagnetic interference resistance.

In one embodiment, the terminal device 1 is a mobile phone, the metal frame 30 is a mobile phone middle frame, and the printed circuit board 20 is disposed inside the mobile phone. Of course, in other embodiments, the terminal device 1 may also be other types of electronic devices, and is not limited herein.

Fig. 4 is a schematic structural diagram of a terminal device 1 according to an embodiment of the present application. The terminal device 1 may include a Radio Frequency (RF) circuit 101, a memory 102 including at least one computer-readable storage medium, an input unit 103, a display unit 104, a sensor 105, an audio circuit 106, a Wireless Fidelity (WiFi) module 107, a processor 108 including at least one processing core, and a power supply 109. It should be understood that the terminal device 1 structure shown in fig. 4 does not constitute a limitation of the terminal device 1, and may comprise more or less components than those shown, or some components may be combined, or a different arrangement of components.

The rf circuit 101 may be used for receiving and transmitting information, or receiving and transmitting signals during a call, and in particular, receives downlink information of a base station and then sends the received downlink information to the at least one processor 108 for processing; in addition, data relating to uplink is transmitted to the base station. In general, the radio frequency circuit 101 includes, but is not limited to, an antenna, at least one amplifier, a tuner, at least one oscillator, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the radio frequency circuit 101 may also communicate with networks and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to global system for Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), and the like.

The memory 102 may be used to store applications and data. The memory 102 stores applications containing executable code. The application programs may constitute various functional modules. The processor 108 executes various functional applications and data processing by running application programs stored in the memory 102. The memory 102 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the terminal device 1, and the like. Further, the memory 102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 102 may also include a memory controller to provide the processor 108 and the input unit 103 access to the memory 102.

The input unit 103 may be used to receive input numbers, character information, or user characteristic information, such as a fingerprint, and generate a keyboard, mouse, joystick, optical, or trackball signal input related to user setting and function control. In particular, in a particular embodiment, the input unit 103 may include a touch-sensitive surface as well as other input devices. The touch-sensitive surface, also referred to as a touch display screen or a touch pad, may collect touch operations by a user (e.g., operations by a user on or near the touch-sensitive surface using a finger, a stylus, or any other suitable object or attachment) thereon or nearby, and drive the corresponding connection device according to a predetermined program. Alternatively, the touch sensitive surface may comprise two parts, a touch detection means and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 108, and can receive and execute commands sent by the processor 108.

The display unit 104 may be used to display information input by or provided to the user and various graphical user interfaces of the terminal device 1, which may be constituted by graphics, text, icons, video and any combination thereof. The display unit 104 may include a display panel. Alternatively, the display panel may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch-sensitive surface may overlay the display panel, and when a touch operation is detected on or near the touch-sensitive surface, the touch operation is transmitted to the processor 108 to determine the type of touch event, and then the processor 108 provides a corresponding visual output on the display panel according to the type of touch event. Although in FIG. 4 the touch-sensitive surface and the display panel are shown as two separate components to implement input and output functions, in some embodiments the touch-sensitive surface may be integrated with the display panel to implement input and output functions. It is understood that the display screen may include the input unit 103 and the display unit 104.

The terminal device 1 may also include at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that adjusts the brightness of the display panel according to the brightness of ambient light, and a proximity sensor that turns off the display panel and/or the backlight when the terminal device 1 is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the mobile phone is stationary, and can be used for applications of recognizing the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured in the terminal device 1, detailed descriptions thereof are omitted.

The audio circuit 106 may provide an audio interface between the user and the terminal device 1 via a speaker, a microphone. The audio circuit 106 can convert the received audio data into an electrical signal, transmit the electrical signal to a speaker, and convert the electrical signal into a sound signal to output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit 106 and converted into audio data, which is then processed by the audio data output processor 108, and then transmitted to, for example, another terminal device 1 via the radio frequency circuit 101, or the audio data is output to the memory 102 for further processing. The audio circuit 106 may also comprise an earphone socket to provide communication of a peripheral earphone with the terminal device 1.

Wireless fidelity (WiFi) belongs to short-distance wireless transmission technology, and the terminal device 1 can help the user to send and receive e-mail, browse web pages, access streaming media and the like through the wireless fidelity module 107, and provides wireless broadband internet access for the user. Although fig. 4 shows the wireless fidelity module 107, it is understood that it does not belong to the essential constitution of the terminal device 1, and may be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 108 is a control center of the terminal device 1 and may be referred to as a main controller, and the processor 108 connects various parts of the terminal device 1 by various interfaces and lines, and executes various functions of the terminal device 1 and processes data by running or executing an application program stored in the memory 102 and calling data stored in the memory 102, thereby monitoring the terminal device 1 as a whole. Optionally, the processor 108 may include one or more processing cores; alternatively, the processor 108 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 108.

The terminal device 1 further includes a power supply 109 for supplying power to the respective components. Preferably, the power supply 109 may be logically connected to the processor 108 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system. The power supply 109 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.

Although not shown in fig. 4, the terminal device 1 may further include a bluetooth module or the like, which is not described in detail herein. In specific implementation, the above modules may be implemented as independent entities, or may be combined arbitrarily to be implemented as the same or several entities, and specific implementation of the above modules may refer to the foregoing method embodiments, which are not described herein again.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shielding grounding structure is used for electrically connecting a printed circuit board and a metal frame body and is characterized by comprising a shielding grounding unit;

the shielding cover is used for being connected with the printed circuit board, and the printed circuit board is electrically connected with the metal frame body through the elastic piece part;

the shielding cover is provided with an accommodating through groove, and the elastic piece part is arranged in the accommodating through groove.

2. The shielding grounding structure of claim 1, wherein the spring portion includes a connecting portion and a cantilever spring leg, the connecting portion is connected to the shielding cover, the cantilever spring leg extends outward from the connecting portion, and the cantilever spring leg is used for electrically connecting to the metal frame.

3. The shielding grounding structure of claim 2, wherein a side surface of said cantilever spring leg facing said metal frame is provided with a convex point.

4. The shielding grounding structure of claim 2, wherein the number of said cantilever spring legs is two, and two of said cantilever spring legs extend outwardly and oppositely from said connecting portion to form a spring leg through hole.

5. The shielding grounding structure of claim 4, wherein the shielding grounding structure further comprises a locking unit for locking the printed circuit board, the cantilever spring leg and the metal frame.

6. The shielding grounding structure of claim 5, wherein the locking unit comprises a screw, and the screw is inserted into the printed circuit board, the spring pin through hole and the metal frame.

7. A terminal device, comprising a printed circuit board, a metal frame, and the shielding ground structure of any one of claims 1 to 6.

8. The terminal device of claim 7, wherein the printed circuit board is connected to the shield can of the shield ground structure by soldering.

9. The terminal device according to claim 7, wherein the terminal device is a mobile phone, and the metal frame body is a mobile phone middle frame.