Grounding spring, circuit board structure and electronic device

Abstract

Some embodiments of the present application provide a grounding spring, a circuit board structure and an electronic device. The grounding spring is suitable for electrical connection of a circuit board and a metal back plate. The circuit board is mounted on the metal back plate. The grounding spring comprises a contact arm, a fixed spring arm and a limiting spring arm arranged on opposite sides of the contact arm respectively. The fixed spring arm is used for connecting the circuit board. The contact arm is used for abutting against the metal back plate. The limiting spring arm is configured to limit and support the circuit board when the circuit board is deformed in a direction close to the metal back plate under pressure. The limiting spring arm can cooperate with the fixed spring arm to support and limit the circuit board when the circuit board is deformed under pressure, thereby preventing the circuit board from being deformed too much to cause damage to the solder joint. In addition, other structures are not required to support the circuit board, which can reduce the number of parts of the electronic device and simplify the assembly process.

Description

Technical Field

[0001] Some embodiments of this application relate to the field of electronic product technology, and in particular to a grounding spring, circuit board structure, and electronic device. Background Technology

[0002] Currently, a television is typically composed of a television screen, a television back panel, a PCBA assembly, and other components. The television back panel serves as a support, and the screen, PCBs, etc., are mounted on the television back panel. The television back panel is made of conductive metal and usually serves as a ground plane. The grounding network of all PCBs is connected to the television back panel through screw holes. Therefore, the television back panel makes a significant contribution to EMC, ESD suppression, and radio frequency performance.

[0003] Typically, the TV motherboard is mounted to the TV back panel using screws, which secure the motherboard to the back panel through screw holes. To pass EMC testing, a grounding spring is usually placed between the back of the TV motherboard and the TV back panel. After the screws are tightened, the grounding spring is sandwiched between the TV motherboard and the TV back panel, and the ground return current enters the TV back panel through the grounding spring. However, the grounding spring only serves to ground the circuit board; the TV motherboard still requires additional structural support. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, some embodiments of this application provide a grounding spring, a circuit board structure, and an electronic device.

[0005] Some embodiments of this application provide a grounding spring suitable for electrical connection between a circuit board and a metal backplate. The circuit board is mounted on the metal backplate. The grounding spring includes a contact arm and a fixed spring arm and a limiting spring arm respectively disposed on opposite sides of the contact arm. The fixed spring arm is used to connect the circuit board, and the contact arm is used to abut against the metal backplate.

[0006] The limiting arm is configured to limit and support the circuit board when it is deformed by pressure toward the metal back plate.

[0007] This grounding spring connects to the circuit board via a fixed spring arm, while the contact arm abuts against the metal back plate, achieving an electrical connection between the circuit board and the metal back plate, thus grounding the circuit board. The limiting spring arm, in conjunction with the fixed spring arm, supports and limits the circuit board when it deforms under pressure, preventing excessive deformation that could damage the solder joints. Furthermore, it eliminates the need for other structures to support the circuit board, reducing the number of electronic device components and simplifying the assembly process.

[0008] In some embodiments, the fixing spring arm includes a first connecting arm and a fixing arm arranged at an angle. The first connecting arm is connected to the contact arm and is arranged at a first preset angle. The fixing arm extends from the first connecting arm toward the limiting spring arm and is used to connect the circuit board.

[0009] By setting a fixed arm that extends towards the limiting spring arm, the fixed arm connects to the circuit board, increasing the contact area between the fixed spring arm and the circuit board. This ensures stable grounding of the circuit board while also improving the support effect of the grounding spring on the circuit board.

[0010] In some embodiments, the limiting spring arm includes a second connecting arm and a limiting arm arranged at an angle. The second connecting arm is connected to the contact arm and is arranged at a second preset angle. The limiting arm extends from the second connecting arm toward the fixed spring arm. The limiting arm is used to support the circuit board or the fixed arm when the circuit board is deformed by pressure.

[0011] The aforementioned limiting arm extends from the second connecting arm toward or away from the fixed spring arm. Thus, when the circuit board is deformed under pressure, the limiting arm increases the contact area between the limiting spring arm and the circuit board or the fixed arm, thereby improving the support and limiting effect on the circuit board.

[0012] In some embodiments, the limiting arm is located between the fixed arm and the contact arm; the limiting arm and the fixed arm have a preset gap, which is used to allow the limiting arm to abut against and support the fixed arm when the circuit board is deformed by pressure.

[0013] In this situation, when the circuit board is under pressure, the limiting arm can abut against the fixed arm to support and limit the circuit board. In this way, the limiting arm does not come into contact with the circuit board, thus avoiding damage to the circuit board.

[0014] In some embodiments, the contact arm is tilted, and one end of the contact arm that connects to the fixed spring arm is relatively close to the circuit board.

[0015] Because of the inclined design of the contact arm, as the grounding spring is installed from the circuit board to the metal backplate, as the circuit board approaches the metal backplate, the circuit board presses the contact arm through the fixed spring arm, causing the contact arm to gradually change from an inclined state relative to the metal backplate to a state parallel to the metal backplate. This allows the grounding spring to be pressed between the circuit board and the metal backplate, enabling the grounding spring to stably contact the metal backplate through the contact arm, thus achieving stable grounding of the circuit board.

[0016] In some embodiments, the fixed spring arm is provided with a claw, which is configured to be soldered to the circuit board.

[0017] By setting up claws, the grounding spring and the circuit board can be welded together, thereby improving the connection stability of the grounding spring and the circuit board.

[0018] Some embodiments of this application provide a circuit board structure, including a circuit board and a grounding spring as described in the above embodiments, wherein the fixing spring arm is connected to the circuit board.

[0019] In some embodiments, the circuit board has through holes;

[0020] The fixing arm of the fixed spring arm is located on the front side of the circuit board, and the limiting arm of the limiting spring arm is located on the back side of the circuit board and directly opposite the through hole. There is a preset gap between the limiting arm and the fixing arm.

[0021] In this situation, when the circuit board is under pressure, the limiting arm can abut against the fixed arm to limit and support the circuit board. In this way, the limiting arm does not come into contact with the circuit board, thus avoiding damage to the circuit board.

[0022] In some embodiments, the circuit board has through holes;

[0023] The claw of the fixed elastic arm extends into the through hole and is then welded to the circuit board.

[0024] The grounding spring is pre-installed through the cooperation of the claws and the through holes. Then the claws are soldered to the circuit board to fix the grounding spring to the circuit board.

[0025] Some embodiments of this application provide an electronic device, including a metal backplate and a circuit board structure as described in the above embodiments;

[0026] The circuit board is mounted on the metal back plate, the contact arm of the grounding spring abuts against the metal back plate, and there is a set gap between the limiting arm of the limiting spring arm and the fixing arm of the fixing spring arm.

[0027] When the contact arm of the grounding spring contacts the metal backplate, electrical conductivity is achieved between the circuit board and the metal backplate, thus grounding the circuit board. The presence of a set gap allows the circuit board to deform towards the metal backplate under pressure, but after a certain deformation, the limiting arm contacts the fixing arm, preventing the deformation of the circuit board from being too large and causing damage to the solder joints. In this way, the grounding of the circuit board is satisfied, and support is also provided for the circuit board, eliminating the need for other structures to support the circuit board. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0030] Figure 1 Schematic diagram of the structure of the grounding spring provided in some embodiments of this application Figure 1 ;

[0031] Figure 2 Schematic diagram of the structure of the grounding spring provided in some embodiments of this application Figure 2 ;

[0032] Figure 3 A top view schematic diagram of a grounding spring provided in some embodiments of this application;

[0033] Figure 4 for Figure 3 Schematic sectional view along the middle AA direction;

[0034] Figure 5 This is a top view schematic diagram of a circuit board structure provided in some embodiments of this application;

[0035] Figure 6 for Figure 5 A cross-sectional view of the circuit board structure in the diagram;

[0036] Figure 7 A cross-sectional schematic diagram of an electronic device provided in some embodiments of this application;

[0037] Figure 8 for Figure 7 A magnified view of a portion of point B in the middle;

[0038] Figure 9 This is a cross-sectional schematic diagram of a circuit board structure provided in some embodiments of this application;

[0039] Figure 10 This is a cross-sectional schematic diagram of an electronic device provided in some embodiments of this application.

[0040] Among them, 1. Grounding spring; 11. Contact arm; 12. Fixing spring arm; 121. First connecting arm; 122. Fixing arm; 13. Limiting spring arm; 131. Second connecting arm; 132. Limiting arm; 14. Claw;

[0041] 2. Circuit board; 21. Through hole;

[0042] 3. Metal back panel. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0045] Currently, the motherboard of a TV is fixed to the metal backplate of the TV with screws. In order to pass EMC testing, a grounding spring is usually placed between the motherboard and the metal backplate. After the screws are tightened, the grounding spring is clamped between the motherboard and the metal backplate. The ground return current enters the metal backplate through the grounding spring. However, the grounding spring only serves to enable the circuit board to achieve the grounding function. The motherboard still needs to have an additional structure for support, which results in more components, more assembly steps for the motherboard, and low assembly efficiency.

[0046] Based on the above problems, this application provides a grounding spring, a circuit board structure, and an electronic device. By setting a limiting spring arm on the grounding spring, the circuit board is limited and supported after being deformed by a preset distance under pressure. This allows the grounding spring to not only ground the circuit board but also limit and support the circuit board, preventing the circuit board from undergoing large deformation and causing damage to the solder joints.

[0047] In some embodiments, such as Figures 1 to 10 As shown, this application provides a grounding spring 1, which is suitable for the electrical connection between a circuit board 2 and a metal back plate 3. The circuit board 2 is mounted on the metal back plate 3, and the function of the grounding spring 1 is to ground the circuit board 2.

[0048] The grounding spring 1 includes a contact arm 11 and a fixed spring arm 12 and a limiting spring arm 13 respectively disposed on opposite sides of the contact arm 11. The fixed spring arm 12 is used to connect the circuit board 2, and the contact arm 11 is used to abut against the metal back plate 3. The limiting spring arm 13 is used to limit and support the circuit board 2 when it is deformed in the direction close to the metal back plate 3 under pressure.

[0049] It should be noted that the contact arm 11, the fixing spring arm 12, and the limiting spring arm 13 are integrally formed, resulting in high structural strength and good overall integrity. For example, they are sheet metal parts formed by bending, and the grounding spring 1 can be made of 0.3mm sheet metal, so that the grounding spring 1 can have a certain degree of elasticity and effectively support the circuit board 2 to prevent the circuit board 2 from continuing to deform.

[0050] In addition, the material of the aforementioned grounding spring 1 is stainless steel, such as stainless steel SUS-301.

[0051] Understandably, the grounding spring 1 is connected to the circuit board 2 via the fixed spring arm 12, while the contact arm 11 abuts against the metal back plate 3, thereby achieving an electrical connection between the circuit board 2 and the metal back plate 3 and grounding the circuit board 2. The limiting spring arm 13 can cooperate with the fixed spring arm 12 to support and limit the circuit board 2 when it is deformed under pressure, thereby preventing excessive deformation of the circuit board 2 from causing damage to the solder joints. Furthermore, no other structure is needed to support the circuit board 2, which can reduce the number of electronic device components and simplify the assembly process.

[0052] In some embodiments, refer to Figures 1 to 4 The aforementioned fixed spring arm 12 includes a first connecting arm 121 and a fixed arm 122 arranged at an angle. The first connecting arm 121 is connected to the contact arm 11 and is arranged at a first preset angle α. The fixed arm 122 extends from the first connecting arm 121 toward the direction close to the limiting spring arm 13. The fixed arm 122 is used to connect the circuit board 2.

[0053] Understandably, by setting a fixed arm 122, which extends towards the limiting spring arm 13, the fixed arm 122 is connected to the circuit board 2, which increases the contact area between the fixed spring arm 12 and the circuit board 2. This ensures that the circuit board 2 is stably grounded, and also helps to improve the support effect of the grounding spring 1 on the circuit board 2.

[0054] In some embodiments, refer to Figures 1 to 4 The aforementioned limiting spring arm 13 includes a second connecting arm 131 and a limiting arm 132 arranged at an angle. The second connecting arm 131 is connected to the contact arm 11 and is arranged at a second preset angle β. The limiting arm 132 extends from the second connecting arm 131 toward the direction of approaching or moving away from the fixed spring arm 12. The limiting arm 132 is used to abut against the circuit board 2 or the fixed arm 122 when the circuit board 2 is pressed.

[0055] Understandably, the limiting arm 132 extends from the second connecting arm 131 toward the direction of approaching or moving away from the fixed spring arm 12. Thus, when the circuit board 2 is deformed by pressure, the setting of the limiting arm 132 can increase the contact area between the limiting spring arm 13 and the circuit board 2 or the fixed arm 122, thereby improving the support and limiting effect on the circuit board 2.

[0056] The second connecting arm 131 serves to connect the limiting arm 132 and the contact arm 11. The limiting arm 132 can be configured to extend towards the fixed spring arm 12, thus forming a "C"-shaped structure with the limiting arm 132, the second connecting arm 131 and the contact arm 11. Alternatively, the limiting arm 132 can be configured to extend away from the fixed spring arm 12, thus forming a "Z"-shaped structure with the limiting arm 132, the second connecting arm 131 and the contact arm 11.

[0057] Reference Figure 4 The aforementioned limiting arm 132 extends toward the fixed spring arm 12.

[0058] For example, in one case, the limiting arm 132 is located between the fixed arm 122 and the contact arm 11, and there is a preset gap between the limiting arm 132 and the fixed arm 122, so that when the circuit board 2 is deformed by pressure, the limiting arm 132 abuts against the supporting fixed arm 122.

[0059] Reference Figures 4 to 6 The circuit board 2 has a through hole 21. After the grounding spring 1 is installed on the circuit board 2, the fixing arm 122 is located on the front of the circuit board 2 and covers at least part of the through hole 21. The limiting arm 132 is located on the back of the circuit board 2 and faces the through hole 21. There is a preset gap L1 between the limiting arm 132 and the fixing arm 122. In this case, when the circuit board 2 is compressed, the limiting arm 132 can abut against the fixing arm 122 to limit and support the circuit board 2. In this way, the limiting arm 132 does not contact the circuit board 2, which can avoid damage to the circuit board 2.

[0060] When the circuit board 2 is installed on the metal back plate 3, the limiting arm 132 and the fixing arm 122 do not contact each other when the circuit board 2 is not deformed under pressure. However, when the circuit board 2 is deformed under pressure, the limiting arm 132 and the fixing arm 122 contact each other to support and limit the circuit board 2, thus preventing the circuit board 2 from undergoing large deformation.

[0061] For example, in another scenario, after the grounding spring is installed onto the circuit board, the limiting arm is located on the back of the circuit board and has a preset gap with the circuit board. In this case, when the circuit board is compressed, the limiting arm can directly contact the circuit board to limit and support the circuit board. That is, the limiting arm acts directly on the circuit board, which can reduce the area of ​​the through hole (the deformation of the grounding spring during installation is caused by pressure and passes through the through hole) or eliminate the need to open a hole on the circuit board.

[0062] It should be noted that the first preset included angle α is an obtuse angle, and the second preset included angle β can be selected as either an obtuse angle or an acute angle. Furthermore, in its natural state, the second connecting arm 131 and the first connecting arm 121 can be set to be parallel or non-parallel.

[0063] For example, refer to Figure 6 and Figure 7 The first preset included angle α is an obtuse angle, the second preset included angle β is an acute angle, and the second connecting arm 131 and the first connecting arm 121 are parallel. At this time, the grounding spring 1 is in the following state when installed between the circuit board 2 and the metal backplate 3: Figure 7 As shown.

[0064] For example, refer to Figure 9 and Figure 10 The first preset included angle α is an obtuse angle, the second preset included angle β is an obtuse angle, and the second connecting arm 131 and the first connecting arm 121 are not parallel. Thus, after installation, the grounding spring 1 has the contact arm 11 parallel to the metal back plate 3, while the second connecting arm 131 and the first connecting arm 121 both form an obtuse angle with the contact arm 11. At this point, the grounding spring 1, after installation, forms a trapezoidal structure. When the circuit board 2 is pressed and squeezes the grounding spring 1, the force exerted by the circuit board 2 on the limiting spring arm 13 and the fixing spring arm 12 has opposite directions in the extension direction of the contact arm 11, or makes the limiting spring arm 13 and the fixing spring arm 12 of the grounding spring 1 perpendicular to the contact arm 11. This helps maintain the stability of the grounding spring 1, thereby stably supporting and limiting the circuit board 2.

[0065] In some embodiments, refer to Figures 1 to 4 The contact arm 11 is inclined, and one end of the contact arm 11 that is connected to the fixed spring arm 12 is relatively close to the circuit board 2.

[0066] Understandably, due to the inclined setting of the contact arm 11, when the grounding spring 1 is installed on the metal back plate 3 of the circuit board 2, as the circuit board 2 approaches the metal back plate 3, the circuit board 2 squeezes the contact arm 11 through the fixing spring arm 12, so that the contact arm 11 gradually changes from an inclined state relative to the metal back plate 3 to a state parallel to the metal back plate 3. In this way, the grounding spring 1 can be squeezed between the circuit board 2 and the metal back plate 3, so that the grounding spring 1 can stably contact the metal back plate 3 through the contact arm 11, and realize the stable grounding of the circuit board 2.

[0067] In some embodiments, refer to Figures 1 to 4 The aforementioned fixed spring arm 12 is provided with a claw 14, which is configured to be soldered to the circuit board 2.

[0068] The circuit board 2 has a through hole, into which the claw 14 can extend. The claw 14 is soldered to the circuit board 2. Thus, the grounding spring 1 and the circuit board 2 are pre-installed through the cooperation of the claw 14 and the through hole. Then, by soldering the claw 14 to the circuit board 2, the grounding spring 1 and the circuit board 2 are stably connected.

[0069] Reference Figures 4 to 6This application provides a circuit board structure, which includes a circuit board 2 and a grounding spring 1 as described in the above embodiment, wherein the fixing arm 12 of the grounding spring 1 is connected to the circuit board 2.

[0070] In some embodiments, the circuit board 2 has a through hole. The fixed spring arm 12 is provided with a claw 14, which extends into the through hole and is soldered to the circuit board 2.

[0071] In other words, the grounding spring 1 is pre-installed through the cooperation of the claw 14 and the through hole, and then the claw 14 is welded to the circuit board 2 to realize the connection and fixation of the grounding spring 1 and the circuit board 2.

[0072] In some embodiments, a through hole 21 is provided on the circuit board 2, the fixing arm 122 of the fixing spring arm 12 is disposed on the front side of the circuit board 2, the limiting arm 32 of the limiting spring arm 13 is located on the back side of the circuit board 2 and is directly opposite the through hole 21, and there is a preset gap L1 between the limiting arm 132 and the fixing arm 122.

[0073] The circuit board 2 is provided with a through hole 21 through which the grounding spring 1 passes. The fixing arm 122 and the contact arm 11 of the fixing spring arm 12 are located on opposite sides of the through hole 21 along its axial direction. The through hole 21 allows the grounding spring 1 to extend through it into the space between the metal back plate 3 and the circuit board 2. The fixing arm 122 of the fixing spring arm 12 is located on the side of the circuit board 2 away from the metal back plate 3. The first connecting arm 121 passes through the through hole, while the contact arm 11 and the limiting spring arm 13 are both located on the side of the circuit board 2 closer to the metal back plate 3.

[0074] Thus, after the circuit board 2 is mounted on the metal back plate 3, the fixing arm 122 is located on the front of the circuit board 2, while the limiting arm 132 is located on the back of the circuit board 2 and directly opposite the through hole 21. When the circuit board 2 is pressed, the limiting arm 132 can abut against the fixing arm 122 to limit and support the circuit board 2. In this way, the limiting arm 132 does not contact the circuit board 2, thus avoiding damage to the circuit board 2.

[0075] Refer to Figure 7 and Figure 8 This application provides an electronic device. This electronic device can be a television, monitor, tablet computer, or other electronic device with a screen.

[0076] In some embodiments, the electronic device includes a metal backplate 3, which provides support, and the screen, circuit board, etc. are mounted on the metal backplate 3.

[0077] In some embodiments, the electronic device further includes the circuit board structure described in the above embodiments. The circuit board 2 is mounted on a metal backplate 3, the contact arm 11 of the grounding spring 1 abuts against the metal backplate 3, and a set gap L2 exists between the limiting arm 132 of the limiting spring arm 13 and the fixing arm 122 of the fixing spring arm 12.

[0078] For example, in one case, the circuit board 2 has a through hole 21. After the grounding spring 1 is installed on the circuit board 2, the fixing arm 122 is located on the front side of the circuit board 2 and covers at least part of the through hole 21, while the limiting arm 132 is located on the back side of the circuit board 2 and faces the through hole 21. When the circuit board 2 is installed on the metal back plate 3, there is a set gap L2 between the limiting arm 132 and the fixing arm 122 (e.g., ...). Figure 8 (As shown).

[0079] Understandably, after the grounding spring 1 is assembled between the circuit board 2 and the metal back plate 3, the fixing arm 122 and the limiting arm 132 do not contact each other, but have a set gap. The existence of this set gap allows the circuit board 2 to deform toward the metal back plate 3 when it is under pressure. However, after a certain deformation, the limiting arm 132 abuts against the fixing arm 122, so that the deformation of the circuit board 2 is not too large and will cause damage to the solder joint. In this way, the grounding of the circuit board 2 can be satisfied, and the circuit board 2 can be supported without the need to set up other structures to support the circuit board 2.

[0080] In this grounding spring 1, after installation, the contact arm 11, the limiting arm 132, and the fixing arm 122 are parallel to each other. That is, the contact arm 11 is parallel to the limiting arm 132 and the fixing arm 122. In this way, the contact arm 11 can increase the contact area with the metal back plate 3, thereby ensuring a stable electrical connection between the circuit board 2 and the metal back plate 3, and ensuring the stable grounding of the circuit board 2. The limiting arm 132 can increase the contact area with the circuit board 2 when supporting and limiting the circuit board 2, thereby achieving stable support and limiting of the circuit board 2.

[0081] It should be noted that after the grounding spring 1 is installed, the contact arm 11 is parallel to the metal back plate 3. That is, at this time, the contact arm 11 is in full contact with the metal back plate 3 along its length. This not only ensures stable contact between the grounding spring 1 and the metal back plate 3, but also allows the circuit board 2 to be supported by the limiting spring arm 13 after a certain deformation when the circuit board 2 is pressed, without having to go through the process of the contact arm 11 being pressed and gradually becoming parallel to the metal back plate 3. In other words, it reduces the deformation of the circuit board 2 when supported by the limiting spring arm 13.

[0082] Reference Figures 1 to 8 For example, this application provides an electronic device that includes a metal backplate 3 and a circuit board structure. This electronic device may be a television.

[0083] The circuit board structure includes a circuit board 2, which is mounted on a metal backplate 3.

[0084] The aforementioned circuit board structure also includes a grounding spring 1. The grounding spring 1 includes a contact arm 11 and a fixed spring arm 12 and a limiting spring arm 13 respectively disposed on opposite sides of the contact arm 11. The fixed spring arm 12 is used to connect the circuit board 2, and the contact arm 11 is used to abut against the metal back plate 3. The limiting spring arm 13 is used to limit and support the circuit board 2 when it is deformed in the direction close to the metal back plate 3 under pressure.

[0085] The fixed spring arm 12 includes a first connecting arm 121 and a fixed arm 122 arranged at an angle. The first connecting arm 121 is connected to the contact arm 11 and is arranged at a first preset angle α. The fixed arm 122 extends from the first connecting arm 121 toward the limiting spring arm 13 and is used to connect the circuit board 2. The limiting spring arm 13 includes a second connecting arm 131 and a limiting arm 132 arranged at an angle. The second connecting arm 131 is connected to the contact arm 11 and is arranged at a second preset angle β. The limiting arm 132 extends from the second connecting arm 131 toward the fixed spring arm 12 and is used to abut against the fixed arm 122 to limit and support the circuit board 2.

[0086] The circuit board 2 has a through hole, and the fixing arm 122 is located on the side of the circuit board 2 away from the metal back plate 3. The fixing arm 122 is provided with a claw 14 that can be inserted into the through hole, and the claw 14 is soldered to the circuit board 2.

[0087] In its natural state, the contact arm 11 is inclined. After the fixing arm 122 is connected to the circuit board 2, one end of the contact arm 11 connected to the fixing spring arm 12 is relatively close to the circuit board 2. After being installed on the circuit board 2 and the metal back plate 3, the contact arm 11 is parallel to the metal back plate 3, and the angle between the first connecting arm 121 and the second connecting arm 131 and the contact arm 11 is an obtuse angle.

[0088] Furthermore, along the length of the fixed arm 122, the length of the fixed arm 122 is greater than the length of the limiting arm 132, and the fixed arm 122 extends above the limiting arm 132. The length of the fixed arm 122 is also greater than the length of the contact arm 11. The fixed spring arm 12 and the limiting spring arm 13 are located on opposite sides of the contact arm 11 along its length.

[0089] The circuit board 2 has a through hole 21. After the grounding spring 1 is installed on the circuit board 2, the fixing arm 122 is located on the front of the circuit board 2 and covers at least part of the through hole 21. The limiting arm 132 is located on the back of the circuit board 2 and faces the through hole 21. There is a set gap L2 between the limiting arm 132 and the fixing arm 122. The set gap L2 can be selected from 0.5mm to 2mm. When the set gap L2 is less than 0.5mm, the deformation of the circuit board 2 is small. When the circuit board 2 is under pressure, it may break due to the limiting arm 132 and the fixing arm 122. When the set gap L2 is greater than 2mm, the deformation of the circuit board 2 is large, which may easily lead to damage to the solder joints on the circuit board 2. Therefore, the set gap L2 is selected from 0.5mm to 2mm so that the circuit board 2 can deform to a certain extent, but not to the point of excessive deformation.

[0090] It should be noted that the limiting arm 132 and the fixing arm 122 of the grounding spring 1 have a preset gap L1 in their natural state. The preset gap L1 is greater than the set gap L2. This is because the contact arm 11 is tilted. Thus, during the process of installing the circuit board 2 onto the metal back plate 3, the end of the contact arm 11 connected to the limiting spring arm 12 first contacts the metal back plate 3. As the fixing arm 122 descends, the contact arm 11 is gradually compressed and rotated. The distance between the fixing arm 122 and the limiting arm 132 continuously decreases, eventually decreasing from the preset gap L1 to the set gap L2.

[0091] After the grounding spring 1 is installed between the circuit board 2 and the metal back plate 3, the aforementioned contact arm 11, limiting arm 132, and fixing arm 122 are parallel to each other. This increases the contact area of ​​the contact arm 11 with the metal back plate 3, thereby ensuring a stable electrical connection between the circuit board 2 and the metal back plate 3, and ensuring stable grounding of the circuit board 2. The limiting arm 132 increases the contact area with the fixing arm 122 when supporting and limiting the circuit board 2, thus enabling the limiting spring arm 132 and the fixing spring arm 122 to cooperate in providing stable support and limiting for the circuit board 2.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grounding spring, characterized in that, Suitable for electrical connection between a circuit board and a metal backplate, wherein the circuit board is mounted on the metal backplate, and the grounding spring includes a contact arm and a fixing spring arm and a limiting spring arm respectively disposed on opposite sides of the contact arm, wherein the fixing spring arm is used to connect the circuit board, and the contact arm is used to abut against the metal backplate; The limiting arm is configured to limit and support the circuit board when it is deformed by pressure toward the metal back plate.

2. The grounding spring according to claim 1, characterized in that, The fixed spring arm includes a first connecting arm and a fixed arm arranged at an angle. The first connecting arm is connected to the contact arm and is arranged at a first preset angle. The fixed arm extends from the first connecting arm toward the limiting spring arm and is used to connect the circuit board.

3. The grounding spring according to claim 2, characterized in that, The limiting arm includes a second connecting arm and a limiting arm arranged at an angle. The second connecting arm is connected to the contact arm and is arranged at a second preset angle. The limiting arm extends from the second connecting arm toward the fixed arm. The limiting arm is used to abut against and support the circuit board or the fixed arm when the circuit board is deformed by pressure.

4. The grounding spring according to claim 3, characterized in that, The limiting arm is located between the fixed arm and the contact arm, and there is a preset gap between the limiting arm and the fixed arm, so that when the circuit board is deformed by pressure, the limiting arm abuts against and supports the fixed arm.

5. The grounding spring according to claim 1, characterized in that, The contact arm is inclined, and one end of the contact arm that connects to the fixed spring arm is relatively close to the circuit board.

6. The grounding spring according to claim 1, characterized in that, The fixed spring arm is provided with a claw, which is configured to be welded to the circuit board.

7. A circuit board structure, characterized in that, It includes a circuit board and a grounding spring as described in any one of claims 1-6, wherein the fixing spring arm is connected to the circuit board.

8. The circuit board structure according to claim 7, characterized in that, The circuit board has through holes; The fixing arm of the fixed spring arm is located on the front side of the circuit board, and the limiting arm of the limiting spring arm is located on the back side of the circuit board and directly opposite the through hole. There is a preset gap between the limiting arm and the fixing arm.

9. The circuit board structure according to claim 7, characterized in that, The circuit board has through holes; The claw of the fixed elastic arm extends into the through hole and is then welded to the circuit board.

10. An electronic device, characterized in that, Includes a metal backplate and a circuit board structure as described in any one of claims 7-9; The circuit board is mounted on the metal back plate, the contact arm of the grounding spring abuts against the metal back plate, and there is a set gap between the limiting arm of the limiting spring arm and the fixing arm of the fixing spring arm.

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