Circuit board assembly and electronic device

Abstract

The present application provides a circuit board assembly and an electronic device, relating to the technical field of electronic devices, and is used to solve the problem that the distance between an existing circuit board and a component electrically connected thereto is relatively large. The circuit board assembly provided by the present application includes a circuit board body and a spring piece. The circuit board body has a first surface, and a recessed portion is provided on the first surface. The spring piece includes a fixing portion and a movable portion. The fixing portion is fixed on the circuit board body, the movable portion is connected to the fixing portion, and the movable portion extends toward the side of the circuit board body away from the first surface. At least a part of the movable portion is located within the recessed portion in the vertical projection on the plane where the first surface is located, and the movable portion can extend into the recessed portion. The above structure is equivalent to using the space occupied by the circuit board body in its own thickness direction to accommodate the movable portion of the spring piece, so that the height of the spring piece protruding from the first surface in the limit state is smaller, thereby further reducing the distance between the flexible circuit board and the circuit board body, which is beneficial to the thinning of the electronic device.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of electronic devices, and in particular, to a circuit board assembly and an electronic device. Background Art

[0002] With the development of electronic devices, electronic devices are increasingly pursuing thinness, lightness, and miniaturization. In an electronic device, the distance between a circuit board and a component electrically connected thereto (the component may be an electronic component or another circuit board) will have a significant impact on the volume of the electronic device and the utilization rate of the internal space of the electronic device.

[0003] For example, in an electronic device, the main board and the flexible circuit board are electrically connected by the metal contacts on the flexible circuit board abutting against the spring pieces fixed on the main board. However, limited by the existing structural design, the distance between the flexible circuit board and the main board is relatively large after electrical connection, resulting in low utilization rate of the internal space of the electronic device and being unfavorable for the thinness and lightness of the electronic device. Summary of the Invention

[0004] Embodiments of the present application provide a circuit board assembly and an electronic device, which are used to solve the problem that the distance between the existing circuit board and the component electrically connected thereto is relatively large, which is unfavorable for the thinness and lightness of the electronic device.

[0005] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, embodiments of the present application provide a circuit board assembly, which includes a circuit board body and a spring piece.

[0007] The circuit board body has a first surface, and a recessed portion is provided on the first surface. The spring piece includes a fixing portion and a movable portion. The fixing portion is fixed on the circuit board body, the movable portion is connected to the fixing portion, and the movable portion extends toward the side of the circuit board body away from the first surface. Wherein, at least a part of the movable portion is located within the recessed portion in the vertical projection on the plane where the first surface is located, and the movable portion can extend into the recessed portion.

[0008] For ease of understanding, hereinafter, it is assumed that the flexible circuit board is electrically connected to the circuit board body and is located on the side of the circuit board body away from the first surface as an example.

[0009] The circuit board assembly provided in the first aspect of the present application is configured such that a recess is provided on the first surface of the circuit board body, and at least a part of the movable portion of the elastic piece is located within the recess in the vertical projection on the plane where the first surface is located. When the movable portion of the elastic piece is deformed under pressure, the movable portion of the elastic piece can extend into the recess. The above structural design is equivalent to using the space occupied by the circuit board body in its own thickness direction to accommodate the movable portion of the elastic piece, so that the height of the elastic piece protruding from the first surface in the extreme state (i.e., the state where the elastic piece has the largest deformation) is smaller, thereby further reducing the distance between the flexible circuit board and the circuit board body, and further improving the utilization rate of the internal space of the electronic device, which is beneficial to the thin and light design of the electronic device.

[0010] Combined with the first aspect, in a possible implementation, the circuit board body has a second surface facing away from the first surface, and the first surface and the second surface are distributed along the thickness direction of the circuit board body. The recess penetrates from the first surface to the second surface. In this way, there is more space on the circuit board body to accommodate the deformed elastic piece. In other words, the recess penetrating the circuit board body can satisfy a larger deformation of the elastic piece. For example, the elastic piece is in a V shape, one end of which is fixed on the first surface of the circuit board body, the bent portion thereof is in contact with the flexible circuit board, and the other end is a movable end. When the pressure on the bent portion of the elastic piece is relatively large, the other end of the elastic piece can not only extend into the recess from the first surface of the circuit board body, but also extend out of the recess from the second surface of the circuit board body. It can be seen that the above structural design further reduces the distance between the flexible circuit board and the circuit board body after electrical connection, and further improves the utilization rate of the internal space of the electronic device, which is beneficial to the thin and light design of the electronic device.

[0011] Combined with the first aspect, in another possible implementation, the fixed portion of the elastic piece is fixed to the first surface. In this way, a part of the elastic piece after being pressed down can extend into the recess from one end of the recess located on the first surface, making the height of the elastic piece protruding from the first surface smaller and further reducing the distance between the flexible circuit board and the circuit board body. And in this case, the minimum distance between the flexible circuit board and the circuit board body is the thickness of the elastic piece.

[0012] Combined with the first aspect, in another possible implementation, the fixed portion of the elastic piece is fixed to the second surface, and the movable portion passes through the recess and extends to the side of the circuit board body away from the first surface. In this way, it is only necessary to make a very small part of the movable portion of the elastic piece extend out from one end of the recess located on the first surface to achieve contact with the metal contact on the flexible circuit board. In this case, the minimum distance between the flexible circuit board and the circuit board body can be less than the thickness of the elastic piece.

[0013] In combination with the first aspect, in another possible implementation, the fixing part of the elastic piece is the bottom plate, and the movable part of the elastic piece is the elastic arm. Wherein, in the thickness direction of the bottom plate, the elastic arm arches away from the bottom plate, and the highest point of the arch of the elastic arm is the contact part, and the contact part is located on the side of the circuit board body away from the first surface.

[0014] Since the elastic arm is generally relatively thin and not convenient for direct soldering to the circuit board body. Even after direct soldering, during the repeated deformation process of the elastic arm, the soldering position between the elastic arm and the circuit board body is prone to solder joint detachment. Therefore, the elastic arm can be arranged on the bottom plate, for example, the elastic arm and the bottom plate are integrally stamped, and then the bottom plate is soldered to the circuit board body, thus facilitating the fixation of the elastic piece. The contact part is used to contact the metal contact on the flexible circuit board.

[0015] In combination with the first aspect, in another possible implementation, the recess covers the vertical projection of the elastic arm on the plane where the first surface is located. That is to say, the vertical projection of the elastic arm on the plane where the first surface is located is entirely within the recess. During the downward pressing of the elastic arm, even if the part with the largest deformation amount on the elastic arm is close to the bottom plate, it can be ensured that this part can extend into the recess. That is to say, the elastic arm will never contact the circuit board body, and the circuit board body will not hinder the deformation process of the elastic arm.

[0016] In combination with the first aspect, in another possible implementation, both ends of the elastic arm are fixedly connected to the bottom plate respectively. In this way, when the contact part of the elastic arm is pressed, the triangle formed by the elastic arm and the bottom plate can make the mechanism of the elastic piece more stable. Under the extrusion of the flexible circuit board, the elastic arm of the elastic piece will produce elastic deformation, and the distance between the contact part of the elastic arm and the bottom plate will gradually decrease. After the flexible circuit board is installed in place, the contact part of the elastic arm will always be in contact with the metal contact on the flexible circuit board, thus ensuring the stability of the electrical connection between the flexible circuit board and the circuit board body.

[0017] In combination with the first aspect, in another possible implementation, there are two bottom plates, namely the first bottom plate and the second bottom plate, and the first bottom plate and the second bottom plate are respectively fixed on both sides of the recess. The elastic arm is located between the first bottom plate and the second bottom plate, and one end of the elastic arm is fixedly connected to the side of the first bottom plate close to the second bottom plate, and the other end of the elastic arm is fixedly connected to the side of the second bottom plate close to the first bottom plate. In this way, the structure of the elastic piece is greatly simplified, and the elastic piece can be directly formed by bending a metal plate, which is beneficial to the miniaturization and lightweight of the elastic piece.

[0018] In combination with the first aspect, in another possible implementation, the elastic arm includes a first branch arm and a second branch arm. The first end of the first branch arm is fixedly connected to the first bottom plate. The first branch arm extends away from the bottom plate. The second end of the first branch arm is fixedly connected to the first end of the second branch arm. The second end of the second branch arm is fixedly connected to the second bottom plate. The first branch arm and the second branch arm are bent toward the side close to each other respectively, and a contact portion is formed at the connection of the first branch arm and the second branch arm. In this way, by fixedly connecting the first branch arm and the second branch arm to the first bottom plate and the second bottom plate respectively, and the contact portion is located at the connection of the first branch arm and the second branch arm, when the elastic arm is compressed, both the first branch arm and the second branch arm will produce a certain degree of elastic deformation, so that the elastic arm can have better elasticity, which is beneficial to keep the contact portion of the elastic arm in close fit with the flexible circuit board, and improve the stability of the electrical connection between the flexible circuit board and the circuit board body. And a smooth transition treatment can also be carried out at the connection of the first branch arm and the second branch arm, so as to increase the contact area between the elastic arm and the flexible circuit board while preventing the contact portion from scratching the flexible circuit board.

[0019] In addition, since the first branch arm and the second branch arm are bent toward the side close to each other respectively, during the process of the elastic deformation of the elastic arm under pressure, the first branch arm and the second branch arm can only approach each other. In this case, when the elastic piece is fixed on the first surface of the circuit board body, the parts of the first branch arm and the second branch arm close to the bottom plate will extend into the recessed portion. When the elastic piece is fixed on the second surface of the circuit board body, the parts of the first branch arm and the second branch arm away from the bottom plate will extend into the recessed portion.

[0020] In combination with the first aspect, in another possible implementation, one end of the elastic arm is a fixed end and the other end is a movable end. The fixed end is fixedly connected to the bottom plate, and the movable end is located on the side of the circuit board body away from the first surface.

[0021] Taking the case where the bottom plate of the elastic piece is fixed on the first surface of the circuit board body as an example, at this time, the elastic arm is completely located on the side of the first surface away from the second surface. When the flexible circuit board of the electronic device is electrically connected to the circuit board body, under the extrusion of the flexible circuit board, the elastic arm of the elastic piece will produce elastic deformation, and the movable end of the elastic arm will gradually approach the first surface and then extend into the recessed portion. That is to say, the movement of the movable end of the elastic arm will not be blocked by the first surface of the circuit board body, and the distance between the contact portion and the bottom plate can be further reduced, so that the distance between the flexible circuit board and the circuit board body is also further reduced.

[0022] In combination with the first aspect, in another possible implementation, the elastic arm includes a first arm and a second arm. The first end of the first arm is a fixed end and is fixedly connected to the bottom plate. The first arm extends away from the bottom plate. The second end of the first arm is fixedly connected to the first end of the second arm. A contact portion is formed at the connection between the first arm and the second arm. The second end of the second arm is a movable end. Since both the first arm and the second arm have a certain length, it is convenient to perform a smooth transition treatment at the connection between the first arm and the second arm, thereby increasing the contact area between the elastic arm and the flexible circuit board while preventing the contact portion from scratching the flexible circuit board.

[0023] In combination with the first aspect, in another possible implementation, the bottom plate and the elastic arm are integrally formed. For example, the bottom plate and the elastic arm can be directly formed by stamping or bending on a metal plate, with higher raw material utilization rate and being beneficial to reducing production costs.

[0024] In combination with the first aspect, in another possible implementation, a plurality of elastic pieces are provided, and the plurality of elastic pieces are arranged in an array on the circuit board body. For example, the plurality of elastic pieces can be respectively and correspondingly abutted against a plurality of metal contacts on the flexible circuit board.

[0025] In the second aspect, the present application provides an electronic device, which includes a housing, a flexible circuit board, and the circuit board assembly provided in the first aspect above. Among them, both the flexible circuit board and the circuit board assembly are arranged in the housing. The flexible circuit board is attached to the inner wall of the housing. The flexible circuit board abuts against the movable portion of the elastic piece, and at least part of the movable portion is located in the recessed portion.

[0026] It can be understood that for the beneficial effects that can be achieved by the electronic device described in the second aspect and any of its possible implementations provided above, reference can be made to the beneficial effects in the first aspect and any of its possible implementations, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the electronic device provided by the embodiment of the present application;

[0028] Figure 2 is the above Figure 1 exploded view of the structure of the electronic device;

[0029] Figure 3 is a partial cross-sectional schematic diagram of a battery electrically connected to the circuit board body provided by the embodiment of the present application;

[0030] Figure 4 is Figure 3 partial enlarged view of part A in;

[0031] Figure 5Schematic diagram of the structure of a circuit board assembly provided by an embodiment of the present application;

[0032] Figure 6 For Figure 5 Partial cross-sectional schematic diagram of the electrical connection between the circuit board assembly in

[0033] Figure 7 Schematic diagram of the structure of another circuit board assembly provided by an embodiment of the present application;

[0034] Figure 8 Schematic diagram of the structure of a spring piece provided by an embodiment of the present application;

[0035] Figure 9 Partial cross-sectional schematic diagram of a circuit board assembly provided by an embodiment of the present application;

[0036] Figure 10 Schematic diagram of the structure of another spring piece provided by an embodiment of the present application;

[0037] Figure 11 Schematic diagram of the structure of yet another circuit board assembly provided by an embodiment of the present application;

[0038] Figure 12 For Figure 11 Partial cross-sectional schematic diagram of the electrical connection between the circuit board assembly in

[0039] Figure 13 Schematic diagram of step one for manufacturing a spring piece by bending a metal plate;

[0040] Figure 14 Schematic diagram of step two for manufacturing a spring piece by bending a metal plate;

[0041] Figure 15 Schematic diagram of step three for manufacturing a spring piece by bending a metal plate;

[0042] Figure 16 Schematic diagram of the structure of yet another spring piece provided by an embodiment of the present application;

[0043] Figure 17 Partial cross-sectional schematic diagram of another circuit board assembly provided by an embodiment of the present application;

[0044] Figure 18 For Figure 17 Partial cross-sectional schematic diagram of the electrical connection between the circuit board assembly in

[0045] Figure 19 Partial cross-sectional schematic diagram of yet another circuit board assembly provided by an embodiment of the present application;

[0046] Figure 20 For Figure 19Partial cross-sectional schematic diagram of the circuit board assembly in electrical connection with the flexible circuit board.

[0047] Reference numerals:

[0048] 01, electronic device; 10, display module; 11, light-transmitting cover plate; 12, display screen; 20, housing; 21, rear cover; 22, frame; 23, middle plate; 30, camera module; 40, circuit board assembly; 41, circuit board body; 410, recess; 410a, first recess; 410b, second recess; 410c, third recess; 410d, fourth recess; 411, first surface; 412, second surface; 42, elastic piece; 42a, first elastic piece; 42b, second elastic piece; 42c, third elastic piece; 42d, fourth elastic piece; 421, elastic arm; 421a, fixed end; 421b, contact part; 421c, movable end; 4211, first arm; 4212, second arm; 4201, first bending part; 4202, second bending part; 422, bottom plate; 422a, first bottom plate; 422b, second bottom plate; 50, camera decorative cover; 60, battery; 70, flexible circuit board. Detailed implementation manners

[0049] In order to make the purpose, technical solutions and advantages of the application clearer, the following further elaborates on the application in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and are not used to limit the application.

[0050] In the description of this application, it should be clear that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and does not mean that the indicated device or element must have a specific orientation or position. Therefore, it should not be construed as a limitation to this application. The "quantity" should not be construed as a limitation to this application either.

[0051] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] An embodiment of the present application provides an electronic device 01. Specifically, the electronic device 01 may be a portable electronic device or other types of electronic devices. For example, the electronic device may be a mobile phone, a tablet personal computer, a personal digital assistant (PDA), a monitor, a wearable device, etc. For the convenience of description below, the electronic device 01 is taken as an example of a mobile phone for illustration.

[0053] Please refer to Figure 1 and Figure 2 as shown, Figure 1 which is a schematic diagram of the overall structure of the electronic device 01 provided by an embodiment of the present application, Figure 2 and Figure 1 is an exploded view of the structure of the electronic device 01 in the above. As can be seen from the above, in this embodiment, the electronic device 01 is a mobile phone, and the electronic device 01 may have an approximate rectangular plate-like structure. The electronic device 01 may include a display module 10, a housing 20, a camera module 30, a circuit board body 41, a camera decorative cover 50, a battery 60, and a flexible circuit board 70.

[0054] For the convenience of the following description, an XYZ coordinate system is established, and it is defined that the width direction of the electronic device 01 is the X-axis direction, the length direction of the electronic device 01 is the Y-axis direction, and the thickness direction of the electronic device 01 is the Z-axis direction. It can be understood that Figure 1 and Figure 2 only schematically show some components included in the electronic device 01, and the actual shape, actual size, actual position, and actual structure of these components are not limited by Figure 1 and Figure 2 .

[0055] The above display module 10 is used to display images, videos, etc. The display module 10 may include a light-transmitting cover plate 11 and a display screen 12 (English name: panel, also known as a display panel), and the light-transmitting cover plate 11 and the display screen 12 are stacked. The material of the light-transmitting cover plate 11 includes but is not limited to glass. For example, the light-transmitting cover plate 11 may adopt a common light-transmitting cover plate to protect the display screen to avoid damage to the display screen caused by external forces and can also play a role in dust prevention. Or, the light-transmitting cover plate 11 may also adopt a light-transmitting cover plate with a touch function to enable the electronic device 01 to have a touch function, thereby making it more convenient for users to use. Therefore, the present application does not make special limitations on the specific material of the light-transmitting cover plate 11.

[0056] In addition, the above-mentioned display screen 12 can be a flexible display screen or a rigid display screen. For example, the display screen 12 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode display screen, a micro light-emitting diode display screen, a microorganic light-emitting diode display screen, a quantum dot light-emitting diode (QLED) display screen, or a liquid crystal display (LCD).

[0057] The above-mentioned housing 20 is used to protect the electronic components inside the electronic device 01. The housing 20 can include a rear cover 21 and a frame 22. The rear cover 21 is located on the side of the display screen 12 away from the light-transmitting cover plate 11 and is stacked with the light-transmitting cover plate 11 and the display screen 12. The frame 22 is located between the light-transmitting cover plate 11 and the rear cover 21. The rear cover 21 is fixed to the frame 22. Exemplarily, the rear cover 21 can be fixed to the frame 22 by means of adhesion, screw connection, welding, snap connection, etc. The light-transmitting cover plate 11 can be fixed to the frame 22 by adhesive so that the light-transmitting cover plate 11, the rear cover 21, and the frame 22 enclose an accommodation cavity inside the electronic device 01. The above-mentioned display screen 12, the circuit board body 41, and the camera module 30 are all arranged in this internal accommodation space.

[0058] In some embodiments, the above-mentioned housing 20 can further include a middle plate 23. The middle plate 23 is arranged in the above-mentioned accommodation cavity and is located on the side of the display screen 12 away from the light-transmitting cover plate 11. The middle plate 23 is fixedly connected to the frame 22 to form the middle frame of the electronic device 01. Exemplarily, the middle plate 23 and the frame 22 can be fixedly connected by means of adhesion, screw connection, welding, snap connection, etc.; or, the middle plate 23 and the frame 22 can also be an integrally formed structure, that is, the middle plate 23 and the frame 22 form a structural member as a whole. The middle plate 23 divides the above-mentioned accommodation cavity into two independent spaces. One space is located between the light-transmitting cover plate 11 and the middle plate 23, and the display screen 12 is located in this space. The other space is located between the middle plate 23 and the rear cover 21, and the above-mentioned circuit board body 41, camera module 30, and battery 60 are all arranged in this space.

[0059] The above camera module 30 is used to implement video or image shooting and can achieve autofocus (AF, AutoFocus), so that it can be applicable to a variety of shooting scenarios. The above camera module 30 can be arranged at a position near one edge of the rear cover 21 as shown in Figure 2 . Or, the camera module 30 can be located at the middle position of the upper part of the rear cover 21 (not shown in Figure 2 ). Therefore, the present application does not make special limitations on the specific position of the camera module 30.

[0060] The above camera decorative cover 50 is used to prevent foreign matters such as dust from entering the interior of the electronic device 01 or the camera module 30, and to prevent the camera module 30 from being scratched or impacted by external objects.

[0061] The above circuit board body 41 is used to arrange the electronic components of the electronic device 01 and realize the electrical connection between the electronic components. Exemplarily, the electronic components can be a control chip (such as a system-on-chip, SOC), a graphics control chip (graphics processing unit, GPU), a universal memory (universal flash storage, UFS), a receiver, a flash module, a resistor, a capacitor, an inductor, etc.

[0062] Among them, the circuit board body 41 can be a main board, a screen circuit board, a camera circuit board, a power circuit board, etc., and the present application does not make special limitations on this. For the convenience of description below, the circuit board body 41 is taken as an example of the main board for introduction.

[0063] At this time, the circuit board body 41 is fixed on the rear cover 21, and the battery 60 is electrically connected to the circuit board body 41 through a flexible circuit board 70, so as to supply power to various electronic components on the circuit board body 41. Specifically, please refer to Figure 3 shown in Figure 3 , which is a partial cross-sectional view (parallel to the YZ plane) of the electrical connection between a battery 60 and a circuit board body 41 provided by an embodiment of the present application. Among them, the electronic device 01 further includes a spring piece 42. The flexible circuit board 70 is located between the circuit board body 41 and the rear cover 21 and is attached to the rear cover 21. The spring piece 42 is fixed on one side of the circuit board body 41 facing the rear cover 21. One end of the flexible circuit board 70 is connected to the battery 60, and the metal contact at the other end of the flexible circuit board 70 abuts against the spring piece 42, so as to realize the electrical connection between the battery 60 and the circuit board body 41.

[0064] However, in the above structure, no matter how large the deformation amount of the spring piece 42 is, the spring piece 42 as a whole can only be on one side of the circuit board body 41 close to the flexible circuit board 70. For example, please continue to refer to Figure 3 , and in combination withFigure 4 As shown Figure 4 is Figure 3 a partial enlarged view of area A in Figure 4 . The shrapnel 42 is V-shaped, with its first end fixed on the circuit board body 41, its bent portion abutting against the flexible circuit board 70, and its second end being the movable end. When the shrapnel 42 is pressed down, the second end of the shrapnel 42 gradually approaches the circuit board body 41, and the limit position that the shrapnel 42 can reach (

[0065] the position shown by the dotted line in Figure 5 and Figure 6 is the abutment of its second end against the circuit board body 41. At this time, there is still a large gap between the flexible circuit board 70 and the circuit board body 41. However, limited by the shrapnel 42, the distance between the flexible circuit board 70 and the circuit board body 41 cannot be further reduced, which results in low utilization rate of the internal space of the electronic device 01 and is not conducive to the thinning of the electronic device 01. Figure 5 Figure 6 Figure 5 To solve the above problems, an embodiment of the present application provides a circuit board assembly 40. Please refer to

[0066] Figure 6

[0067]

[0068]

[0067] It can be understood that the fixed part of the shrapnel 42 and the circuit board body 41 can be electrically connected by means such as welding, riveting, threaded connection, conductive adhesive bonding, etc. The material of the shrapnel 42 can be a metal with good conductivity such as copper, aluminum, silver, etc. The present application does not make special limitations on this.

[0068] The number of the elastic pieces 42 can be one or multiple, depending on the number of metal contacts on the flexible circuit board 70. This application does not make special limitations on this. When there are multiple metal contacts (such as positive contacts, negative contacts, ground contacts, etc.) on the flexible circuit board 70, correspondingly, multiple elastic pieces 42 are also provided on the circuit board body 41, and the multiple elastic pieces 42 are respectively in abutting connection with the multiple metal contacts of the flexible circuit board 70 one by one. In addition, the multiple elastic pieces 42 can share one recess 410, or one recess 410 can be correspondingly provided for each elastic piece 42, as long as it can be satisfied that when each elastic piece 42 is squeezed, the part of the elastic piece 42 protruding from the first surface 411 can extend into the recess 410. This application does not make special limitations on this.

[0069] The cross-section of the recess 410 can be a regular or irregular shape such as a circle, a rectangle, a trapezoid, etc. This application does not make special limitations on this.

[0070] The above-mentioned recess 410 can be a groove. For example, the depth of the recess 410 is one-third, one-half, two-thirds, etc. of the thickness of the circuit board body 41. The recess 410 can also be a through hole, that is, the recess 410 penetrates the circuit board body 41. This application does not make special limitations on this.

[0071] When the recess 410 penetrates the circuit board body 41, the fixing part of the above-mentioned elastic piece 42 can be fixed on the first surface 411 of the circuit board body 41, or can be fixed on the second surface 412. In the following embodiments, the case where the fixing part of the elastic piece 42 is fixed on the first surface 411 is taken as an example for introduction.

[0072] Exemplarily, please continue to refer to Figure 5 As shown, four elastic pieces 42 are provided on the first surface 411 of the circuit board body 41. The four elastic pieces 42 are respectively a first elastic piece 42a, a second elastic piece 42b, a third elastic piece 42c and a fourth elastic piece 42d. The four elastic pieces 42 are arranged in a rectangular array of two rows and two columns. Correspondingly, four recesses 410 are formed on the first surface 411 of the circuit board body 41. The four recesses 410 are respectively a first recess 410a, a second recess 410b, a third recess 410c and a fourth recess 410d. The four recesses 410 are also arranged in a rectangular array of two rows and two columns. The depth of each recess 410 is one-half of the thickness of the circuit board body 41. Among them, the first recess 410a corresponds to the first elastic piece 42a, the second recess 410b corresponds to the second elastic piece 42b, the third recess 410c corresponds to the third elastic piece 42c, and the fourth recess 410d corresponds to the fourth elastic piece 42d. The vertical projection of the movable part of each elastic piece 42 on the plane where the first surface 411 is located is located in the corresponding recess 410.

[0073] In this way, when each elastic piece 42 is deformed under pressure, the movable part of the elastic piece 42 can extend into the corresponding recess 410. That is to say, the above structural design is equivalent to using the space occupied by the circuit board body 41 in its own thickness direction (parallel to the Z-axis) to accommodate the movable part of the elastic piece 42, so that the height of the elastic piece 42 protruding from the first surface 411 is smaller in the extreme state (that is, after the circuit board assembly 40 is installed in place, the state where the elastic piece 42 has the largest amount of deformation), thereby further reducing the distance between the flexible circuit board 70 and the circuit board body 41, and further improving the utilization rate of the internal space of the electronic device 01, which is beneficial to the thinning of the electronic device 01.

[0074] Exemplarily, please refer to Figure 7 as shown in Figure 7 which is a schematic structural diagram of another circuit board assembly 40 provided by an embodiment of the present application. Figure 7 in the above Figure 5 The difference from the circuit board assembly 40 in Figure 5 is that the four elastic pieces 42 in

[0075] are grouped in pairs of two, that is, the first elastic piece 42a and the second elastic piece 42b are in one group, and the third elastic piece 42c and the fourth elastic piece 42d are in another group. A recess 410 is formed in the circuit board body 41 and penetrates from the first surface 411 to the second surface 412. The two groups of elastic pieces are respectively fixed on both sides of the recess 410 and are arranged staggeredly. The vertical projection of the movable part of each elastic piece 42 on the plane where the first surface 411 is located is located in the same recess 410. In this way, when each elastic piece 42 is deformed under pressure, the movable part of the elastic piece 42 can extend into the recess 410, and since the two groups of elastic pieces are arranged staggeredly, no interference will occur between the two groups of elastic pieces. Figure 5 and combine with Figure 8 as shown in Figure 8 which is a schematic structural diagram of an elastic piece 42 provided by an embodiment of the present application. Among them, the fixed part of the elastic piece 42 can be the bottom plate 422, the movable part of the elastic piece 42 can be the elastic arm 421, the bottom plate 422 is fixed on the circuit board body 41, the elastic arm 421 is arranged on the bottom plate 422, and the elastic arm 421 extends toward the side of the first surface 411 away from the second surface 412. The elastic arm 421 is used to abut against the metal contact of the flexible circuit board 70.

[0076] In this way, the bottom plate 422 can increase the contact area between the elastic piece 42 and the circuit board body 41, which is convenient for fixing the elastic piece 42. When the elastic arm 421 is squeezed, at least part of the elastic arm 421 protruding from the first surface 411 can extend into the recess 410.

[0077] It can be understood that the elastic arm 421 and the bottom plate 422 can be connected by means such as welding, bonding, clamping, etc. Alternatively, the elastic arm 421 and the bottom plate 422 can also be connected as an integrally formed structure, that is, the elastic arm 421 and the bottom plate 422 form an integral structural member, and there is no separation fault between the two. Compared with the split structure, the integrally formed structure is more firm and is convenient for production and manufacturing (for example, it can be formed at one time by processes such as stamping, casting, 3D printing, etc.).

[0078] Further, the recessed portion 410 covers the vertical projection of the elastic arm 421 on the plane where the first surface 411 of the circuit board body 41 is located. That is to say, the vertical projection of the elastic arm 421 on the plane where the first surface 411 is located is entirely within the recessed portion 410. In this way, during the downward pressing process of the elastic arm 421, it will never contact the circuit board body 41, that is, the circuit board body 41 will not hinder the deformation process of the elastic arm 421.

[0079] For example, please refer to Figure 9 shown in Figure 9 which is a partial cross-sectional view (parallel to the YZ plane) of a circuit board assembly 40 provided by an embodiment of the present application. The circuit board body 41 is arranged parallel to the XY plane, the bottom plate 422 is fixed on the first surface 411 of the circuit board body 41, and the recessed portion 410 penetrates through the circuit board body 41. The elastic arm 421 is in an S shape, and the elastic arm 421 can be divided into a first bending portion 4201 and a second bending portion 4202. The first bending portion 4201 bends towards the direction close to the circuit board body 41, and the second bending portion 4202 bends towards the direction away from the circuit board body 41.

[0080] During the downward pressing process of the elastic arm 421, the elastic arm 421 rotates around the bottom plate 422 (as shown by the dotted line in Figure 9 ). At the same time, it may also be accompanied by a gradual decrease in the curvature of the first bending portion 4201. When the elastic arm 421 is pressed down to a certain extent, the first bending portion 4201 will first extend into the recessed portion 410. During this process, the first bending portion 4201 will not contact the circuit board body 41.

[0081] On the above basis, please refer back to Figure 8 shown in. The elastic arm 421 can include a first branch arm 4211 and a second branch arm 4212 that are connected. The connection portion of the first branch arm 4211 and the second branch arm 4212 arches towards the side away from the bottom plate 422 to form a contact portion 421b for abutting against the flexible circuit board 70. After the elastic piece 42 is installed on the circuit board body 41, the contact portion 421b is located on the side of the first surface 411 away from the second surface 412.

[0082] It can be understood that the lengths of the first arm 4211 and the second arm 4212 may be equal or unequal. The elastic arm 421 may be fixed to the bottom plate 422 at both ends simultaneously, or one end of the elastic arm 421 may be fixed to the bottom plate 422 while the other end is suspended. This application does not make special limitations on this.

[0083] Exemplarily, please continue to refer to Figure 8 as shown. The elastic sheet 42 is formed by one-time stamping. The bottom plate 422 is rectangular, and the elastic arm 421 is V-shaped. The bottom plate 422 is arranged parallel to the XY plane, and the thickness direction of the bottom plate 422 is parallel to the Z axis. The elastic arm 421 is connected to the edge of the bottom plate 422 and extends toward the side away from the second surface 412 of the first surface 411.

[0084] One end of the elastic arm 421 is a fixed end 421a, and the other end is a movable end 421c. The fixed end 421a, the contact portion 421b, and the movable end 421c are distributed in sequence. Among them, the length of the first arm 4211 is greater than the length of the second arm 4212. The first end of the first arm 4211 is the fixed end 421a and is fixedly connected to the first wall plate 4221. The first arm 4211 extends away from the bottom plate 422. The second end of the first arm 4211 is fixedly connected to the first end of the second arm 4212. The connection portion between the first arm 4211 and the second arm 4212 forms the contact portion 421b. The second end of the second arm 4212 is the movable end 421c.

[0085] To prevent the contact portion 421b from scratching the flexible circuit board 70 and increase the contact area between the contact portion 421b and the flexible circuit board 70, a smooth transition treatment can also be performed at the connection portion between the first arm 4211 and the second arm 4212.

[0086] When the circuit board body 41 is installed in place, please continue to refer to Figure 8 as shown. Under the extrusion of the flexible circuit board 70, the elastic arm 421 will produce elastic deformation. The angle α between the first arm 4211 and the bottom plate 422 gradually increases, and the contact portion 421b and the movable end 421c move toward the bottom plate 422. After the circuit board body 41 is installed in place, the contact portion 421b will always be in contact with the metal contact of the flexible circuit board 70, thereby ensuring the stability of the electrical connection between the flexible circuit board 70 and the circuit board body 41. At the same time, the movable end 421c of the elastic arm 421 (i.e., the second end of the second arm 4212) will extend into the recess 410, thereby further reducing the distance between the flexible circuit board 70 and the circuit board body 41, which is more conducive to the thinning of the electronic device 01.

[0087] Exemplarily, please refer to Figure 10 and Figure 11 as shown, Figure 10Another structural schematic diagram of the elastic sheet 42 provided by the embodiment of the present application. Figure 11 Another structural schematic diagram of the circuit board assembly 40 provided by the embodiment of the present application. Both ends of the elastic arm 421 are fixed on the bottom plate 422. Among them, the lengths of the first branch arm 4211 and the second branch arm 4212 are the same. The first end of the first branch arm 4211 is fixedly connected to the bottom plate 422. The first branch arm 4211 extends in the positive Z-axis direction and gradually moves away from the bottom plate 422. The second end of the first branch arm 4211 is fixedly connected to the first end of the second branch arm 4212. The second end of the second branch arm 4212 is fixedly connected to the bottom plate 422, and the first branch arm 4211 and the second branch arm 4212 are bent toward the side close to each other respectively.

[0088] In this way, since the first branch arm 4211 and the second branch arm 4212 are bent toward the side close to each other respectively, and the distances between both ends of the elastic arm 421 are fixed and remain unchanged. Therefore, during the process of the elastic arm 421 being compressed and deformed, please refer to Figure 12 as shown. Figure 12 is Figure 11 A partial cross-sectional schematic diagram (parallel to the YZ plane) of the circuit board assembly 40 and the flexible circuit board 70 electrically connected in

[0089] Please continue to refer to Figure 10 and Figure 11 as shown. Two bottom plates 422 can be provided, namely the first bottom plate 422a and the second bottom plate 422b. The first bottom plate 422a and the second bottom plate 422b are respectively fixed on both sides of the recess 410. The elastic arm 421 is located between the first bottom plate 422a and the second bottom plate 422b, and one end of the elastic arm 421 is fixedly connected to the side of the first bottom plate 422a close to the second bottom plate 422b, and the other end of the elastic arm 421 is fixedly connected to the side of the second bottom plate 422b close to the first bottom plate 422a.

[0090] With this setting, the structure of the elastic sheet 42 is simplified, so that the elastic sheet 42 with the above structure can be directly formed by bending a metal plate, which is beneficial to the miniaturization and light weight of the elastic sheet 42.

[0091] For example, please refer to Figure 13 , Figure 14 and Figure 15 as shown. Figure 13 is a schematic diagram of the first step of manufacturing the elastic sheet 42 by bending a metal plate. Figure 14Schematic diagram of the second step for manufacturing the elastic piece 42 by bending a metal plate Figure 15 Schematic diagram of the third step for manufacturing the elastic piece 42 by bending a metal plate

[0092] During production, first mark three folding lines along the length direction on a long strip of metal plate, which are the first folding line a1, the second folding line a2, and the third folding line a3 in sequence. Assume the metal plate is placed parallel to the XY plane, and all three folding lines are parallel to the Y axis. Then first bend the metal plate at the position of the second folding line a2 by a first angle in the positive Z-axis direction, and then bend the metal plate at the positions of the first folding line a1 and the third folding line a3 by a second angle in the negative Z-axis direction, and the aforementioned Figure 10 elastic piece 42 shown in can be obtained. The part between the first folding line a1 and the first end of the metal plate is the first bottom plate 422a, the part between the first folding line a1 and the second folding line a2 is the first support arm 4211, the part between the second folding line a2 and the third folding line a3 is the second support arm 4212, and the part between the third folding line a3 and the second end of the metal plate is the second bottom plate 422b

[0093] In practical applications, the area of the bottom plate 422 can also be appropriately increased, thereby improving the installation convenience of the elastic piece 42 and the stability after the elastic piece 42 is connected to the circuit board body 41. For example, please refer to Figure 16 shown in Figure 16 Schematic diagram of another structure of the elastic piece 42 provided by the embodiment of the present application Figure 16 In, the widths of the first bottom plate 422a and the second bottom plate 422b in the X-axis direction are both greater than the width of the elastic arm 421 in the X-axis direction

[0094] The above embodiments introduce the fixing of the elastic piece 42 on the first surface 411 of the circuit board body 41. Next, taking the fixing of the elastic piece 42 on the second surface 412 of the circuit board body 41 as an example for introduction

[0095] Please refer to Figure 17 shown in Figure 17 Partial cross-sectional schematic diagram (parallel to the YZ plane) of another circuit board assembly 40 provided by the embodiment of the present application. When the elastic piece 42 is fixed on the second surface 412 of the circuit board body 41, the recess 410 needs to penetrate from its first surface 411 to the second surface 412 along the thickness direction of the circuit board body 41, that is, the recess 410 is a through hole, and the elastic piece 42 is inserted into the recess 410 and extends out from one end of the recess 410 located on the first surface 411

[0096] At this time, only by making the elastic piece 42 protrude a very small part from the first surface 411 can the contact with the metal contact on the flexible circuit board 70 be realized. In this case, the minimum distance between the flexible circuit board 70 and the circuit board body 41 can be less than the thickness of the elastic piece 42.

[0097] Exemplarily, please continue to refer to Figure 17 as shown in Figure 17 In the circuit board assembly 40 in Figure 8 the elastic piece 42 is fixed on the second surface 412 of the circuit board body 41. Specifically, the bottom plate 422 of the elastic piece 42 is fixed on the second surface 412 of the circuit board body 41, the first arm 4211 of the elastic arm 421 passes through the recess 410, and the second arm 4212 of the elastic arm 421 is completely located on the side of the first surface 411 away from the second surface 412. In this way, the contact portion 421b and the movable end 421c are also located on the side of the first surface 411 away from the second surface 412.

[0098] Please refer to Figure 18 as shown in Figure 18 which is Figure 17 a partial cross-sectional view (parallel to the YZ plane) of the circuit board assembly 40 in

[0099] Exemplarily, please refer to Figure 19 as shown in Figure 19 which is a partial cross-sectional view (parallel to the YZ plane) of another circuit board assembly 40 provided by an embodiment of the present application. Figure 19 In the circuit board assembly 40 in Figure 10 the elastic piece 42 is fixed on the second surface 412 of the circuit board body 41. Specifically, the first bottom plate 422a and the second bottom plate 422b are both fixed on the second surface 412 of the circuit board body 41 and are respectively located on both sides of the recess 410. The first arm 4211 and the second arm 4212 both pass through the recess 410, and the contact portion 421b formed at the connection of the first arm 4211 and the second arm 4212 is located on the side of the first surface 411 away from the second surface 412.

[0100] Please refer toFigure 20 As shown Figure 20 is Figure 19 a partial cross-sectional view (parallel to the YZ plane) of the circuit board assembly 40 and the flexible circuit board 70 in being electrically connected. When the elastic arm 421 is pressed down, the included angle β between the first arm 4211 and the second arm 4212 gradually decreases, the curvature of the first arm 4211 and the second arm 4212 gradually increases, the contact portion 421b moves towards the circuit board body 41, and the portions of the first arm 4211 and the second arm 4212 protruding from the first surface 411 will gradually extend into the recess 410, and the flexible circuit board 70 and the circuit board body 41 gradually approach. When the contact portion 421b of the elastic arm 421 also extends into the recess 410, the distance between the flexible circuit board 70 and the circuit board body 41 is zero.

[0101] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0102] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A circuit board assembly, characterized in that: include: A circuit board body, the circuit board body having a first surface and a second surface that are opposite to each other, the first surface and the second surface are distributed along the thickness direction of the circuit board body, a recessed portion is provided on the first surface, and the recessed portion passes through from the first surface to the second surface; A spring sheet, the spring sheet is used for electrical connection between the circuit board body and other components; the spring sheet includes a fixed portion and a movable portion, the fixed portion is fixed on the circuit board body, the movable portion is connected to the fixed portion, and the movable portion extends to a side of the circuit board body away from the first surface; Wherein, a vertical projection of at least part of the movable portion on the plane where the first surface is located is located in the recessed portion, and the movable portion can extend into the recessed portion; The fixed portion of the elastic sheet is fixed to the second surface, and the movable portion passes through the recessed portion and extends toward a side of the circuit board body away from the first surface.

2. The circuit board assembly according to claim 1, characterized in that: The fixed part of the spring sheet is a bottom plate, and the movable part of the spring sheet is an elastic arm; Wherein, in the thickness direction of the bottom plate, the elastic arm is arched toward a side away from the bottom plate, the highest point of the arch of the elastic arm is a contact portion, and the contact portion is located on a side of the circuit board body away from the first surface.

3. The circuit board assembly according to claim 2, characterized in that: The recessed portion covers a vertical projection of the elastic arm on the plane where the first surface is located.

4. The circuit board assembly according to claim 2, characterized in that: Two ends of the elastic arm are fixedly connected to the bottom plate respectively.

5. The circuit board assembly according to claim 4, characterized in that: The base plates are provided with two, namely a first base plate and a second base plate; the first base plate and the second base plate are respectively fixed on both sides of the recessed portion; the elastic arm is located between the first base plate and the second base plate, and one end of the elastic arm is fixedly connected to a side of the first base plate close to the second base plate, and the other end of the elastic arm is fixedly connected to a side of the second base plate close to the first base plate.

6. The circuit board assembly according to claim 5, characterized in that: The elastic arm includes a first support arm and a second support arm; the first end of the first support arm is fixedly connected to the first base plate; the first support arm extends in a direction away from the base plate; the second end of the first support arm is fixedly connected to the first end of the second support arm; the second end of the second support arm is fixedly connected to the second base plate; the first support arm and the second support arm are respectively bent toward one side close to each other, and the connection between the first support arm and the second support arm forms the contact portion.

7. The circuit board assembly according to claim 2, characterized in that: One end of the elastic arm is a fixed end, and the other end of the elastic arm is a movable end. The fixed end is fixedly connected to the bottom plate, and the movable end is located on a side of the circuit board body away from the first surface.

8. The circuit board assembly according to claim 7, characterized in that: The elastic arm includes a first support arm and a second support arm, the first end of the first support arm is the fixed end and is fixedly connected to the base plate; the first support arm extends in a direction away from the base plate; the second end of the first support arm is fixedly connected to the first end of the second support arm, the connection between the first support arm and the second support arm forms the contact portion, and the second end of the second support arm is the movable end.

9. The circuit board assembly according to claim 2, characterized in that: The bottom plate and the elastic arm are integrally formed.

10. The circuit board assembly according to claim 1, characterized in that: A plurality of the spring sheets are provided, and the plurality of the spring sheets are distributed in an array on the circuit board body.

11. An electronic device, characterized in that: It comprises a shell, a flexible circuit board and a circuit board assembly according to any one of claims 1 to 10, wherein the flexible circuit board and the circuit board assembly are both arranged in the shell, the flexible circuit board is attached to the inner wall of the shell, the flexible circuit board abuts against the movable part of the spring, and at least part of the movable part is located in the recessed part.

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