Patent Description:
Due to the small size of an electronic device, available space inside the electronic device is limited. An electronic device usually needs to accommodate components such as a screen, a battery, a printed circuit board, and a camera module within limited space, which poses high requirements on efficient space utilization of the electronic device.

In the related art, some electronic products use stack-type circuit boards. A stack-type circuit board includes a plurality of stacked circuit boards, and the circuit boards are used for carrying electronic components. The stack-type circuit board makes full use of vertical space of the circuit board, thereby reducing space occupied by a conventional two-dimensional planar circuit board. However, in the stack-type circuit board, a shielding case needs to be provided for an electronic component that requires electromagnetic shielding, and the shielding case causes a larger vertical dimension of the stack-type circuit board. As a result, the stack-type circuit board occupies a large vertical space.

Chinese patent application <CIT> discloses circuit board device comprising two circuit boards, electrically connected by the bendable connecting members, and which can be stacked. European patent application <CIT> discloses an electromagnetic shielding plate, an electromagnetic shield structure, and entertainment device. US patent application <CIT> discloses a shield structure for use in an electronic apparatus including a shield case for covering a first and second circuitry block and for isolating each other.

Embodiments of this application provide a circuit board assembly and an electronic device, which can solve the problem that the stack-type circuit board occupies a large vertical space in the related art.

According to a first aspect, this application provides a circuit board assembly, including: a first circuit board and a second circuit board stacked with the first circuit board, the first circuit board is provided with a first shielding frame on a surface facing toward the second circuit board, the second circuit board is provided with a second shielding frame on a surface facing toward the first circuit board, and opposite end portions of the first shielding frame and the second shielding frame are connected to a shared shielding cover, so that the shared shielding cover, the first shielding frame, and the first circuit board define a first shielding cavity, and the shared shielding cover (<NUM>), the second shielding frame, and the second circuit board define a second shielding cavity.

In the circuit board assembly provided in the embodiments of this application, the shielding frames on the opposite surfaces of the first circuit board and the second circuit board share a shared shielding cover, so that the electromagnetic shielding needs of components on the opposite surfaces of the two adjacent circuit boards can be satisfied, and it is also advantageous to reduce the vertical size of the circuit board assembly, and reduce the vertical space occupied by the circuit board assembly, thereby meeting the electromagnetic shielding needs of the components within a limited space.

In the first aspect, at least one of the first shielding frame and the second shielding frame is detachably connected to the shared shielding cover. This helps achieve both the assembly efficiency and assembly flexibility of the circuit board assembly.

In the first aspect, at least one of the first shielding frame and the second shielding frame includes: a shielding frame body and an elastic abutment portion, where the elastic abutment portion is disposed at an end portion of the shielding frame body that faces toward the shared shielding cover, and the elastic abutment portion abuts against the shared shielding cover. This helps achieve both the assembly efficiency and assembly flexibility of the circuit board assembly.

In the first aspect, the elastic abutment portion comprises a plurality of elastic plates configured to form a closed ring structure.

In a possible implementation, the elastic abutment portion is tilted relative to the shielding frame body, and in a direction away from the shielding frame body, the elastic abutment portion is tilted toward the interior of the shielding cavity. This helps reduce the space occupied by the second shielding frame.

According to a second aspect, this application provides an electronic device, including: a housing and the circuit board assembly described above, where the circuit board assembly is disposed in an accommodating space of the housing.

The circuit assembly provided in the embodiments of this application may be applied to an electronic device <NUM>. The electronic device <NUM> may be a mobile terminal a fixed terminal, or a foldable device with circuit assemblies, for example, a desktop computer, a laptop, a tablet computer, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a handheld computer, an intercom, a netbook, a POS machine, a personal digital assistant (personal digital assistant, PDA) or the like.

<FIG> is a three-dimensional schematic structural diagram of an electronic device. <FIG> is an exploded schematic structural diagram of an electronic device. Referring to <FIG> and <FIG>, the electronic device <NUM> provided in the embodiments of this application may include: a housing <NUM> that can provide a structural framework for the electronic device <NUM>. The housing <NUM> has an accommodating space, and a circuit board assembly <NUM> may be disposed in the accommodating space. In addition, the accommodating space may further be used to accommodate a battery <NUM>, a speaker, a microphone, a receiver, or a camera module of the electronic device <NUM>.

Referring to <FIG> and <FIG>, in some embodiments, when the electronic device <NUM> has a display function, the electronic device may further have a display screen <NUM>, and the display screen <NUM> is mounted on the housing <NUM>. The display screen <NUM> and the housing <NUM> jointly define the accommodating space. The display screen <NUM> may be electrically connected to the circuit board assembly <NUM>, and can receive a control signal from the circuit board assembly <NUM> and display content accordingly.

Referring to <FIG>, in some embodiments, the housing <NUM> may include a middle frame <NUM> and a rear cover <NUM> connected to each other, and the rear cover <NUM> is at the rear side of the middle frame <NUM>. The display screen <NUM> is located in front of the middle frame <NUM>. A circuit board assembly <NUM> may be arranged between the display screen <NUM> and the rear cover <NUM>. In other embodiments, the housing <NUM> may be one-piece or split-type housing made of metal, plastic, or the like, and the implementation process may be the same or similar to the embodiments of this application.

Referring to <FIG>, in some embodiments, the middle frame <NUM> may include a metal middle plate <NUM> and a frame <NUM> connected to each other. The frame <NUM> is disposed around the periphery of the metal middle plate <NUM>, and the rear side of the metal middle frame <NUM> may be in seal fit with the edge of the rear cover <NUM>. The metal middle plate <NUM> is located in front of the rear cover <NUM>. A circuit board assembly <NUM> and a battery <NUM> may be disposed on the metal middle plate <NUM>.

<FIG> is an exposed three-dimensional diagram of a circuit board assembly in the related art. <FIG> is a schematic diagram of a cross-sectional structure of <FIG> taken along an A-A direction. Arrows Z in <FIG> are used for indicating a vertical direction.

Referring to <FIG>, in the related art, the circuit board assembly 20a includes: a plurality of stacked circuit boards. The plurality of circuit boards vertically stacked. For example, the circuit board assembly 20a includes: a first circuit board 21a and a second circuit board 23a stacked with the first circuit board 21a. The first circuit board 21a has a first surface and a second surface opposite to each other. The second circuit board 23a has a third surface and fourth surface opposite to each other. The second surface of the first circuit board 21a is disposed opposite to the third surface of the second circuit board 23a.

The first circuit board 21a is used for carrying a first component 22a. The first component 22a may be disposed on the first surface or the second surface of the first circuit board 21a. The first component 22a may alternatively be disposed on the first surface and the second surface of the first circuit board 21a. The first component 22a includes, but is not limited to, one or more of a system on a chip (system on a chip, SoC), a dynamic random access memory (such as a double data rate synchronous dynamic random access memory (double data rate synchronous dynamic random access memory, DDRSDRAM), a power management unit, a flash memory (flash memory, such as an embedded multimedia card, a universal flash storage (universal flash storage, UFS), or so like), a radio frequency (radio frequency, RF), and a power amplifier. The first component 22a may form an electrical connection with the first circuit board 21a through a welding process such as reflow welding.

The SoC may include one or more processing units. For example, the SoC may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural-network processing unit (neural-network processing unit, NPU), or so like. Different processing units may be independent components or may be integrated in one or more units.

The second circuit board 23a is used for carrying a second component 24a. The second component 24a may be disposed on the third surface or the fourth surface of the second circuit board 23a. The second component 24a may alternatively be disposed on the third surface and the fourth surface of the second circuit board 23a. The second component 24a includes, but is not limited to, one or more of a SoC, a dynamic random access memory, a power management unit, a flash memory chip, an RF, and a power amplifier. The second component 24a may form an electrical connection with the second circuit board 23a through a welding process such as reflow welding.

In some embodiments, the circuit board assembly 20a further includes: a connecting plate <NUM> that is connected between the first circuit board 21a and the second circuit board 23a. The connecting plate <NUM> an achieve not only a structural connection between the first circuit board 21a and the second circuit board 23a, but also an electrical connection between the first circuit board 21a and the second circuit board 23a. One or more connecting plates may be connected between the second circuit board 23a and the first circuit board 21a.

A signal transmitted by the connecting plate <NUM> includes, but is not limited to, one or more of a radio frequency signal, a ground signal, and a power signal. The radio frequency signal includes high frequency, very high frequency and super high frequency, with the frequency ranging from <NUM> (kilohertz) to <NUM> (gigahertz). For example, the first component 22a includes an RF, the second component 24a includes an SOC, and the connecting plate <NUM> is configured to transmit a radio frequency signal between the RF and the SOC.

For example, the connecting plate <NUM> includes a plate body, a signal transmission portion, and a grounding portion. One end of the plate body is connected to the first circuit board 21a, and the other end of the plate body is connected to the second circuit board 23a. The plate body is provided with a signal transmission hole and at least one grounding hole. The signal transmission hole extends from one end of the plate body to the other end of the plate body. The signal transmission portion is arranged in the signal transmission hole. The signal transmission portion connects the first circuit board 21a and the second circuit board 23a. The signal transmission portion is configured to transmit a signal between the first circuit board 21a and the second circuit board 23a. At least one grounding hole extends from one end of the plate body to the other end of the plate body, and extends along a same path as the signal transmission hole. At least one grounding hole surrounds the signal transmission hole and is spaced apart from the signal transmission hole. The grounding portion is arranged in at least one grounding hole. The grounding portion connects the first circuit board 21a and the second circuit board 23a. The grounding portion is configured to connect the ground of the first circuit board 21a and the ground of the second circuit board 23a. In this case, the first circuit board 21a, the grounding portion, and the second circuit board 23a achieve grounding continuity.

In some embodiments, the circuit board assembly 20a may further include a thermal radiation layer that is made of an interface material and configured to conduct heat generated by the first component 22a or the second component 24a to the outside, thereby achieving the purpose of reducing the temperature of the first component 22a or the second component 24a. The thermal radiation layer is, for example, a thermal conductive film made of a graphene material. The thermal radiation layer may be adhered to the surface of the first component 22a or the second component 24a. Taking the first component 22a as an example: when the first component 22a generates heat in operation, the heat may be conducted to the interface material, and the heat is conducted to the outside through thermal radiation of the interface material, thereby reducing the temperature of the first component 22a, protecting the first component 22a from overheating and damage, and further preventing the frequency of the first component 22a from decreasing due to overheating, and improving the performance of the first component 22a.

Referring to <FIG>, the second surface of the first circuit board 21a is provided with a shielding case <NUM>. The shielding case <NUM> may be a metal shielding case. The shielding case <NUM> is used for covering part of or all of the first component 22a mounted on the second surface. For example, the shielding case <NUM> is of a box structure with an opening. The box structure includes a frame body and a cover body, the cover body is connected to one end of the frame body, and an opening is provided at the other end of the frame body. The end of the frame body at which the opening is provided fits the first circuit board 21a. In this way, the shielding case <NUM> and the first circuit board 21a can define a closed shielding cavity, thereby suppressing the electromagnetic interference for the covered first component 22a. The shielding case <NUM> may be made of a lightweight sheet of aluminum, thereby reducing the overall weight of the circuit board assembly 20a.

<FIG> is an exploded schematic structural diagram of another circuit board assembly in the related art. <FIG> is a schematic diagram of a cross-sectional structure of <FIG> taken along a B-B direction. Arrows Z in <FIG> and <FIG> are used for indicating a vertical direction.

Referring to <FIG> and <FIG>, in the related art, in order to improve the layout density of components and further reduce the volume of the circuit board assembly 20a, the third surface of the second circuit board 23a may be provided with the second component 24a. Correspondingly, the third surface may further be provided with a shielding case <NUM>. The shielding case <NUM> is used for covering part of or all of the second component 24a mounted on the third surface, thereby suppressing the electromagnetic interference for the covered second component 24a. The structure and material of the shielding case <NUM> on the third surface may be the same as or similar to those of the shielding case <NUM> on the second surface. There is a vertical gap between the shielding case <NUM> on the second surface and the shielding case <NUM> on the third surface, and the vertical gap allows for manufacturing tolerances, so as to reduce the difficulty of assembly. However, the added shielding case <NUM> on the third surface, and the vertical gap between the shielding cases <NUM> on the second surface and the third surface cause an increase in the vertical size of the circuit board assembly. As a result, the circuit board assembly 20a occupies a large vertical space, which is adverse to the lightweight design of the electronic device. Therefore, how to meet the electromagnetic shielding needs of the first component 22a and the second component 24a in a limited space is one of the problems to be solved urgently.

In order to overcome the foregoing problem, the embodiments of this application provide a circuit board assembly <NUM>. Shielding frames on opposite surfaces of two adjacent circuit boards share a shared shielding cover, so that the electromagnetic shielding needs of components on the opposite surfaces of the two adjacent circuit boards can be satisfied, and it is also advantageous to reduce the vertical size of the circuit board assembly <NUM>, and reduce the vertical space occupied by the circuit board assembly <NUM>, thereby meeting the electromagnetic shielding needs of the components within a limited space.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to an embodiment of this application. <FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly taken along a C-C direction in <FIG> according to an embodiment of this application. Arrows Z in <FIG> and <FIG> are used for indicating a vertical direction.

Referring to <FIG> and <FIG>, in some embodiments, a second surface of a first circuit board <NUM> is provided with a first shielding frame <NUM>, a third surface of a second circuit board <NUM> is provided with a second shielding frame <NUM>, and the first shielding frame <NUM> and the second shielding frame <NUM> share a shared shielding cover <NUM>. The first circuit board <NUM>, the first shielding frame <NUM>, and the shared shielding cover <NUM> define a shielding cavity for accommodating the first component <NUM>, thereby suppressing electromagnetic interference for the first component <NUM>; and the second circuit board <NUM>, the second shielding frame <NUM>, and the shared shielding cover <NUM> define a shielding cavity for accommodating the second component <NUM>, thereby suppressing the electromagnetic interference for the accommodated second component <NUM>. In this way, the first shielding frame <NUM> and the second shielding frame <NUM> share the shared shielding cover <NUM>, which not only achieves electromagnetic interference suppression for the first component <NUM> and the second component <NUM> that are located on two opposite surfaces, but also saves the vertical space occupied by at least one shielding cover and the assembly gap. This helps reduce the vertical space occupied by the circuit board assembly <NUM>, and is advantageous to the lightweight design of the electronic device, thereby meeting the electromagnetic shielding needs of the first component <NUM> and the second component <NUM> within a limited space.

The first shielding frame <NUM> may be prismatic, cylindrical, or conical. The second shielding frame <NUM> may be prismatic, cylindrical, or conical. The shape of the shared shielding cover <NUM> matches at least one of the first shielding frame <NUM> and the second shielding frame <NUM>. For example, the first shielding frame <NUM> may be prismatic, the second shielding frame <NUM> may be prismatic, and the shared shielding cover <NUM> is of a polygonal plate-like structure. The first shielding frame <NUM> may be cylindrical, the second shielding frame <NUM> may be cylindrical, and the shared shielding cover <NUM> is of a circular plate-like structure.

One or more first shielding frames <NUM> may be provided. One or more second shielding frames <NUM> may be provided. One or more shared shielding covers <NUM> may be provided, and the quantity of shared shielding covers <NUM> may match a smaller one of the quantities of first shielding covers and second shielding covers. The quantity of first shielding frames <NUM> and the quantity of second shielding frames <NUM> may be specified according to actual needs. The quantity of first shielding frames <NUM> may or may not be equal to the quantity of second shielding frames <NUM>.

For example, there may be a plurality of first shielding frames <NUM> and one second shielding frame <NUM>, and one shared shielding cover <NUM> may be provided. There may be one first shielding frames <NUM> and a plurality of second shielding frames <NUM>, and one shared shielding covers <NUM> may be provided. There may be a plurality of first shielding frames <NUM> and a plurality of second shielding frames <NUM>, where the quantity of the first shielding frames <NUM> is less than the quantity of the second shielding frames <NUM>, and the quantity of the shared shielding covers <NUM> may be less than or equal to the quantity of the first shielding frames <NUM>. There may be a plurality of first shielding frames <NUM> and a plurality of second shielding frames <NUM>, where the quantity of the second shielding frames <NUM> is less than the quantity of the first shielding frames <NUM>, and the quantity of the shared shielding covers <NUM> may be less than or equal to the quantity of the second shielding frames <NUM>.

In some examples, when the first component <NUM> on the first surface needs to be shielded, the shielding case <NUM> may be disposed at a corresponding position on the first surface. Alternatively, when the second component <NUM> on the fourth surface needs to be shielded, the shielding case <NUM> may be disposed at a corresponding position on the fourth surface. Alternatively, when a device on one surface requires electromagnetic shielding in corresponding regions of the second surface and the third surface, the shielding case <NUM> may be provided on the corresponding surface. For example, in the first component <NUM> arranged on the second surface and the second component <NUM> arranged at a corresponding position on the third surface, when only the first component <NUM> needs to be shielded, the shielding case <NUM> may be provided at the position of the first component <NUM>.

In the embodiments of this application, the first shielding frame <NUM> and the second shielding frame <NUM> sharing the shared shielding cover <NUM> may be implemented in many manners. For example, the shared shielding cover <NUM> may be connected to the first shielding frame <NUM> in a non-detachable manner, and the shared shielding cover <NUM> is detachably connected to the second shielding frame <NUM>. Alternatively, the shared shielding cover <NUM> may be detachably connected to the first shielding frame <NUM>, and the shared shielding cover <NUM> is connected to the second shielding frame <NUM> in a non-detachable manner. Alternatively, the shared shielding cover <NUM> may be detachably connected to the first shielding frame <NUM> and the second shielding frame <NUM>. Alternatively, the shared shielding cover <NUM> may be connected to the first shielding frame <NUM> and the second shielding frame <NUM> in a non-detachable manner. The detachable connection includes at least one of the following: abutment, clamping and plugging. The non-detachable connection includes at least one of the following: integral forming, or bonding by a welding machine. Definitely, the detachable connection and the non-detachable connection are not limited thereto, and this embodiment merely shows an example for illustration.

In addition, it should be noted that: the quantity of circuit boards in the circuit board assembly is not limited to two, and the quantity of circuit boards in the circuit board assembly may be more than two. The specific quantity of circuit boards is not limited in the embodiments of this application.

For ease of description, the embodiments of this application and the corresponding drawings take two circuit boards as an example. When the quantity of circuit boards in the circuit board assembly is more than two, one of two circuit boards adjacent to each other may be the first circuit board and the other is the second circuit board. When the quantity of circuit boards in the circuit board assembly is more than two, the implementation process thereof is similar to this embodiment of this application. Details are not described again in this embodiment.

For example, the circuit board assembly may include three circuit boards stacked vertically in sequence, the top and bottom circuit boards may be first circuit boards, and the circuit board located in the middle may be a second circuit board, that is, the three circuit boards may be: a first circuit board, a second circuit board, and a first circuit board in sequence from top to bottom. In another example, the circuit board assembly may include four circuit boards stacked vertically in sequence, and the four circuit boards may be: a first circuit board, a second circuit board, a first circuit board, and a second circuit board in sequence from top to bottom. In further another example, the circuit board assembly may include three circuit boards stacked vertically in sequence, and the three circuit boards may alternatively be: a second circuit board, a first circuit board, and a second circuit board in sequence from top to bottom. It can be understood that, the layout of the circuit boards in the circuit board assembly is not limited thereto, and this embodiment merely shows an example for description.

The implementation of the first shielding frame <NUM> and the second shielding frame <NUM> sharing the shared shielding cover <NUM> is described in detail below in conjunction with the accompanying drawings.

Referring to <FIG> and <FIG>, in a possible implementation, in order to achieve both the assembly efficiency and assembly flexibility, the shared shielding cover <NUM> may be connected to the first shielding frame <NUM> in a non-detachable manner; and the shared shielding cover <NUM> may abut against the second shielding frame <NUM>. The second shielding frame <NUM> has a shielding frame body <NUM> and an elastic abutment portion <NUM>, and the elastic abutment portion <NUM> is disposed at an end of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM>. The second shielding frame <NUM> may abut against the shared shielding cover <NUM> through the elastic abutment portion <NUM>. The elastic abutment portion <NUM> may abut against a surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM>. The elastic abutment portion <NUM> may be made of an elastic material having an electromagnetic shielding effect. The elastic abutment portion <NUM> and the shielding frame body <NUM> may be integrally formed, or welded or plugged together.

The elastic abutment portion <NUM> may be tilted relative to the shielding frame body <NUM>, and tilted toward the interior of the shielding cavity, so as to reduce the space occupied by the second shielding frame <NUM>. Definitely, the elastic abutment portion <NUM> may be tilted relative to the shielding frame body <NUM> toward the outside of the shielding cavity; alternatively, the elastic abutment portion <NUM> and the shielding frame body <NUM> are both arranged vertically.

In this way, when the second shielding frame <NUM> is assembled with the shared shielding cover <NUM>, the shared shielding cover <NUM> exerts a certain force on the elastic abutment portion <NUM>, and the elastic abutment portion <NUM> stores elastic potential energy under the force. Under the action of the elastic potential energy, the elastic abutment portion <NUM> can be tightly pressed against the surface of the shared shielding cover <NUM>, which helps ensure the connection reliability between the second shielding frame <NUM> and the shared shielding cover <NUM>.

The elastic abutment portion <NUM> includes a plurality of elastic plates. As shown in <FIG>, the plurality of elastic plates are connected to form a closed ring structure, so that the second shielding frame <NUM>, the shared shielding cover <NUM> and the second circuit board <NUM> define a closed shielding cavity. Alternatively, the plurality of elastic plates are located at an end of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM> and are arranged on two opposite end surfaces.

In this way, when the second shielding frame <NUM> is assembled with the shared shielding cover <NUM>, the shared shielding cover <NUM> exerts a certain force on the elastic plates. Under the force, the elastic plates are elastically deformed and store elastic potential energy. Under the action of the elastic potential energy, the elastic plates can be tightly pressed against the surface of the shared shielding cover <NUM>, which helps ensure the connection reliability between the second shielding frame <NUM> and the shared shielding cover <NUM>.

In order to avoid the deviation of the second shielding frame <NUM> relative to the shared shielding cover <NUM>, the surface of the shared shielding cover <NUM> may be provided with a groove, and the elastic abutment portion <NUM> fits the groove to achieve a limiting effect to avoid the deviation of the second shielding frame <NUM> relative to the shared shielding cover <NUM>.

In other examples, the elastic abutment portion <NUM> may alternatively include an elastic protrusion and a spring that abuts between the elastic protrusion and the shielding frame body <NUM>. In this way, when the second shielding frame <NUM> is assembled with the shared shielding cover <NUM>, under the force exerted by the shared shielding cover <NUM>, the spring is compressed and stores elastic potential energy. Under the action of the elastic potential energy, the elastic protrusion can be tightly pressed against the surface of the shared shielding cover <NUM>. The elastic protrusion may be hemispherical, cylindrical, or tapered. The layout of the elastic protrusion may be similar to that of the elastic plate, which is not described again herein.

In other examples, the elastic abutment portion <NUM> may alternatively include a torsion spring, where one end of the torsion spring is connected to the shielding frame body <NUM>, and the other end of the torsion spring is used for abutting against the surface of the shared shielding cover <NUM>. In this way, when the second shielding frame <NUM> is assembled with the shared shielding cover <NUM>, under the force exerted by the shared shielding cover <NUM>, the torsion spring generates torque and stores potential energy, so that the torsion spring can be tightly pressed against the surface of the shared shielding cover <NUM>. The layout of the torsion spring may be similar to the layout of the elastic plate, which is not described again herein.

In other embodiments, the elastic abutment portion <NUM> may alternatively be located on the outer periphery of the first shielding frame <NUM>, and the elastic abutment portion <NUM> may abut against the outer surface of the first shielding frame <NUM> that is away from the shielding cavity.

In some other embodiments, the shared shielding cover <NUM> may be connected to the second shielding frame <NUM> in a non-detachable manner. The first shielding frame <NUM> may abut against the shared shielding cover <NUM> or the second shielding frame <NUM>. The implementation of this embodiment may be similar to the foregoing embodiments.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to a comparative example of this application. <FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly taken along a D-D direction in <FIG> according to a comparative embodiment of this application. Arrows Z in <FIG> and <FIG> are used for indicating a vertical direction.

Referring to <FIG> and <FIG>, in a possible implementation, the second shielding frame <NUM> is inserted on an outer side at an end, which is close to the shared shielding cover <NUM>, of the first shielding frame <NUM>. An outer surface of the first shielding frame <NUM> is provided with a first clamping slot <NUM>, and the second shielding frame <NUM> is provided with a first protrusion portion <NUM>. In this way, the second shielding frame <NUM> is clamped with the first shielding frame <NUM> through fitting between the first protrusion portion <NUM> and the first clamping slot <NUM>, thereby detachably connecting the second shielding frame <NUM> to the shared shielding cover <NUM>.

The shared shielding cover <NUM> may be connected to the first shielding frame <NUM> in a non-detachable manner. The first clamping slot <NUM> is disposed in a region, which is close to the shared shielding cover <NUM>, on the outer surface of the first shielding frame <NUM>, to further reduce the occupied space.

As shown in <FIG>, some of the outer surfaces of the first shielding frame <NUM> are provided with the first clamping slots <NUM>. For example, two opposite outer surfaces of the first shielding frame <NUM> are provided with the first clamping slots <NUM>, and correspondingly, the corresponding two surfaces of the second shielding frame <NUM> are provided with the first protrusion portions <NUM>, so as to reduce the difficulty of assembly.

<FIG> is a schematic structural diagram of a first shielding frame and a shared shielding cover according to a comparative example of this application. Referring to <FIG>, all the outer surfaces of the first shielding frame <NUM> may be provided with the first clamping slots <NUM>. Two opposite surfaces of the second shielding frame <NUM> may be provided with the first protrusion portions <NUM> to reduce the difficulty of assembly. Alternatively, all the outer surfaces of the second shielding frame <NUM> may be provided with the first protrusion portions <NUM> to define a more closed shielding cavity.

As shown in <FIG> and <FIG>, the first clamping slot <NUM> may include a strip-shaped blind hole structure, and the blind hole structure extends along a circumferential direction of the first shielding frame <NUM>. Each outer surface of the first shielding frame <NUM> may be provided with one first clamping slot <NUM>. Definitely, each outer surface of the first shielding frame <NUM> may be provided with a plurality of first clamping slots <NUM> that arranged in parallel at intervals, and the first protrusion portion <NUM> may fit one of the plurality of first clamping slots <NUM> of the same outer surface. As shown in <FIG>, all outer surfaces of the first shielding frame <NUM> are provided with the first clamping slots <NUM>, and the first clamping slots <NUM> on adjacent outer surfaces are communicated.

Correspondingly, the first protrusion portion <NUM> may include a strip-shaped rib. At least some of the surfaces of the second shielding frame <NUM> may be provided with ribs to correspond to at least some of the plurality of first clamping slots <NUM>. Alternatively, the first protrusion portion <NUM> may include a clamping block. There may be a plurality of clamping blocks arranged at intervals. The clamping blocks may be disposed on at least some of the surfaces of the second shielding frame <NUM> to correspond to at least some of the plurality of first clamping slots <NUM>.

<FIG> is a schematic structural diagram of a first shielding frame and a shared shielding cover according to another comparative example of this application. Referring to <FIG>, the first clamping slot <NUM> may include a rectangular blind hole structure, or a circular blind hole structure. There is a plurality of first clamping slots <NUM> uniformly distributed at intervals. Each outer surface of the first shielding frame <NUM> may be provided with a plurality of first clamping slots <NUM> distributed at intervals. The plurality of first clamping slots <NUM> may be distributed in one row or a plurality of rows. Correspondingly, the first protrusion portion <NUM> may include a clamping block. There may be a plurality of clamping blocks, and the plurality of clamping blocks are spaced apart. The clamping blocks may be disposed corresponding to at least some of the plurality of first clamping slots <NUM>.

In some examples, in a direction toward the first clamping slot <NUM>, the vertical dimension of at least part of the cross section of the first protrusion portion <NUM> along the D-D direction is gradually reduced to form a first guiding surface. For example, the cross section of the first protrusion portion <NUM> in the D-D direction may be hemispherical, trapezoidal, or triangular. This helps the first protrusion portion <NUM> to enter the first clamping slot <NUM>, thereby improving the assembly efficiency. Definitely, the cross section of the first clamping slot <NUM> in the D-D direction may be rectangular.

In other examples, in order to help the first protrusion portion <NUM> to enter the first clamping slot <NUM> and improve the assembly efficiency, in the direction toward the first protrusion portion <NUM>, the vertical dimension of at least part of the cross section of the first clamping slot <NUM> along the D-D direction may be gradually increased, for example, at least part of the cross section of the first clamping slot <NUM> along the D-D direction may be trapezoidal or hemispherical. Definitely, the cross section of the first protrusion portion <NUM> along the D-D direction may also be rectangular.

<FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly according to another comparative example of this application, and the arrow Z in <FIG> is used for indicating a vertical direction. For the cross-sectional direction of <FIG>, refer to the D-D direction in <FIG>.

Referring to <FIG>, in some embodiments, an outer surface of the first shielding frame <NUM> may be provided with a first protrusion portion <NUM>, and the second shielding frame <NUM> may be provided with a first clamping slot <NUM>. The shared shielding cover <NUM> may be connected to the second shielding frame <NUM> in a non-detachable manner. The structure and layout of the first clamping slot <NUM> may be the same as or similar to those in the foregoing embodiment, and the structure and layout of the first protrusion portion <NUM> may be the same as or similar to those in the foregoing example. Details are not described again herein.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to further another comparative example of this application. <FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly taken along an E-E direction in <FIG> according to a comparative embodiment of this application Arrows Z in <FIG> and <FIG> are used for indicating a vertical direction.

Referring to <FIG> and <FIG>, in a possible implementation, a plurality of columns <NUM> may be disposed on a surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM>, and the plurality of columns <NUM> on the surface are clamped with the first shielding frame <NUM>. A plurality of columns <NUM> may be disposed on a surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM>, and the plurality of columns <NUM> on the surface are clamped with the second shielding frame <NUM>. In this way, when the first shielding frame <NUM> and second shielding frame <NUM> are assembled with the shared shielding cover <NUM>, it is less difficult to clamp the first shielding frame <NUM> and second shielding frame <NUM> with the plurality of columns <NUM>, thereby improving the assembly efficiency.

The column <NUM> may be a cylinder or a prism. A plurality of columns <NUM> located at the same edge may be arranged at interval. The plurality of columns <NUM> located at the same edge may be evenly distributed. The columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM> may be opposite to or staggered from the columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM>.

In general, the height of the column <NUM> in the vertical direction may be equal to or less than the height of the corresponding shielding frame, so that the first shielding frame <NUM> is in contact with the second surface of the first circuit board <NUM> and the surface of the shared shielding cover <NUM> to form a relatively closed shielding cavity, and the second shielding frame <NUM> is in contact with the third surface of the second circuit board <NUM> and the surface of the shared shielding cover <NUM> to form a relatively closed shielding cavity.

During assembly, the columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM> may be in contact with the second surface of the first circuit board <NUM>, and the columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM> may be in contact with the third surface of the second circuit board <NUM>, so that the columns <NUM> can further achieve a support function. Alternatively, the columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM> may be spaced apart from the second surface of the first circuit board <NUM>, and the columns <NUM> on the surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM> may be spaced apart from the third surface of the second circuit board <NUM>.

In some examples, a surface of the column <NUM> may be provided with a second protrusion portion <NUM>; the first shielding frame <NUM> and the second shielding frame <NUM> may be each provided with a second clamping slot <NUM> that fits the second protrusion portion <NUM>.

The second protrusion portion <NUM> may be a strip-shaped rib, and the rib may extend in a direction parallel to a surface of the shared shielding cover <NUM>. Taking the column <NUM> being quadrangular as an example, the column <NUM> is provided with a second protrusion portion <NUM> on a surface that faces toward the first shielding frame <NUM> or the second shielding frame <NUM>, and the second protrusion portion <NUM> extends to two surfaces adjacent to the current surface. Definitely, in other examples, the second protrusion portion <NUM> may alternatively be a block-shaped or hemispherical protrusion structure.

The second protrusion portion <NUM> may have a second guiding surface used for guiding the second protrusion portion <NUM> into the corresponding second clamping slot <NUM>. The second guiding surface may be an oblique surface or a curved surface.

The arrangement position of the second clamping slot <NUM> matches the second protrusion portion <NUM>. On inner surfaces that faces toward the columns <NUM>, the first shielding frame <NUM> and the second shielding frame <NUM> are provided with second clamping slots <NUM> in regions corresponding to the second protrusion portions <NUM>.

In some examples, the second clamping slot <NUM> may be a strip-shaped blind hole structure. The length direction of the second clamping slot <NUM> may extend along an arrangement direction of the second protrusion portions <NUM> on the same edge. Taking the first shielding frame <NUM> being quadrilateral as an example, the second clamping slot <NUM> is provided on the surface of the first shielding frame <NUM> that faces toward the columns <NUM> and extends to two surfaces adjacent to the current surface. All the second protrusion portions <NUM> on the same edge can fit the strip-shaped second clamping slot <NUM>. In this way, even if a manufacturing error occurs, the second protrusion portion <NUM> can fit the second clamping slot <NUM> smoothly, making it less difficult to clamp the first shielding frame <NUM> and the second shielding frame <NUM> with the plurality of columns <NUM>.

In other examples, the second clamping slot <NUM> may be a rectangular blind hole structure, or a circular blind hole structure. A plurality of second clamping slots <NUM> are uniformly distributed at intervals, and the arrangement positions and quantity of the second clamping slots <NUM> match the second protrusion portions <NUM>. In the specific implementation, the size of the second clamping slot <NUM> may be slightly larger than the size of the second protrusion portion <NUM>, to allow for manufacturing errors, thereby making it less difficult to clamp the first shielding frame <NUM> and the second shielding frame <NUM> with the plurality of columns <NUM>.

The second clamping slot <NUM> is only required to have a shape that can accommodate a matching second protrusion portion <NUM>. For example, referring to <FIG>, when the cross section of the second protrusion portion <NUM> along the E-E direction is hemispherical, the cross section of the second clamping slot <NUM> along the E-E direction may be hemispherical, or the cross section of the second clamping slot <NUM> along the E-E direction may be polygonal. When the cross section of the second protrusion portion <NUM> along the E-E direction is polygonal, the cross section of the second clamping slot <NUM> along the E-E direction may be polygonal or hemispherical.

In other examples, the first shielding frame <NUM> and the second shielding frame <NUM> may be provided with the second protrusion portions <NUM>, and the surface of the column <NUM> may be provided with a second clamping slot <NUM> that fits the second protrusion portion <NUM>. The implementation of the second protrusion portion <NUM> and the second clamping slot <NUM> may be the same as or similar to those in the foregoing examples.

Referring to <FIG>, in some embodiments, some of the plurality of columns <NUM> may be distributed on edges of a surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM>, and other columns <NUM> may be distributed on edges of a surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM>, to improve the connection reliability between the first shielding frame <NUM> and the shared shielding cover <NUM>, and between the second shielding frame <NUM> and the shared shielding cover <NUM>. For example, when the shared shielding cover <NUM> is a circular plate-like structure, the columns <NUM> may be evenly distributed at intervals in the circumferential direction. When the shared shielding cover <NUM> is a rectangular plate-like structure, the columns <NUM> may be evenly distributed along the rectangle at intervals.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to still another comparative example of this application. Referring to <FIG>, in some examples, some of the plurality of columns <NUM> may be distributed on two opposite edges of a surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM>, and other columns <NUM> may be distributed on two opposite edges of a surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM>, to reduce the assembly difficulty of the first shielding frame <NUM>, the second shielding frame <NUM>, and the shared shielding cover <NUM>. For example, when the shared shielding cover <NUM> is a rectangular plate-like structure, the columns <NUM> may be distributed on two opposite side edges of the rectangular plate-like structure.

In other examples, the shared shielding cover <NUM> may be provided with a plurality of columns <NUM> on a surface facing toward the first shielding frame <NUM>, and the plurality of columns <NUM> are clamped with the first shielding frame <NUM>. The second shielding frame <NUM> may be clamped with the first shielding frame <NUM>, or the second shielding frame <NUM> may abut against the shared shielding cover <NUM>, or the second shielding frame <NUM> may be connected to the shared shielding cover <NUM> in a non-detachable manner. The implementation of the clamping between the columns <NUM> and the first shielding frame <NUM> may be the same as or similar to that in the foregoing example.

In other examples, the shared shielding cover <NUM> may be provided with a plurality of columns <NUM> on a surface facing toward the second shielding frame <NUM>, and the plurality of columns <NUM> are clamped with the second shielding frame <NUM>. The first shielding frame <NUM> may be clamped with the second shielding frame <NUM>, or the first shielding frame <NUM> may abut against the shared shielding cover <NUM>, or the first shielding frame <NUM> may be connected to the shared shielding cover <NUM> in a non-detachable manner. The implementation of the clamping between the columns <NUM> and the second shielding frame <NUM> may be the same as or similar to that in the foregoing example.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to further another comparative example of this application. <FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly taken along an F-F direction in <FIG> according to a comparative example of this application. Arrows Z in <FIG> and <FIG> are used for indicating a vertical direction.

Referring to <FIG> and <FIG>, in some examples, the first shielding frame <NUM> and the second shielding frame <NUM> may be plugged with the shared shielding cover <NUM> to improve assembly flexibility. The shared shielding cover <NUM> are provided with slots <NUM> on surfaces facing toward the first shielding frame <NUM> and the second shielding frame <NUM>, and the first shielding frame <NUM> and the second shielding frame <NUM> are inserted in the corresponding slots <NUM>.

The slots <NUM> on the surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM> are used as an example for description. It can be understood that, when at least some of the slots <NUM> on the surface of the shared shielding cover <NUM> that faces toward the second shielding frame <NUM> are communicated, the implementation process may be similar to that of the slots <NUM> on the surface of the shared shielding cover <NUM> that faces toward the first shielding frame <NUM>.

In some examples, a plurality of slots <NUM> located on a same surface of the shared shielding cover <NUM> may be communicated. The plurality of slots <NUM> may be communicated to define a mating space that matches the shape of the first shielding frame <NUM>. For example, when the first shielding frame <NUM> is prismatic, at least some of the slots <NUM> are communicated and the defined matching space may be a quadrilateral annular space. In another example, when the first shielding frame <NUM> is cylindrical, at least some of the slots <NUM> are communicated and the defined matching space may be a quadrilateral annular space. End surfaces of an end of the first shielding frame <NUM> that faces toward the shared shielding cover <NUM> may be inserted into the corresponding slots <NUM>, so that the first shielding frame <NUM>, the shared shielding cover <NUM>, the first circuit board <NUM> define a relatively closed shielding cavity.

In other examples, the slots <NUM> may not be communicated. For example, slots <NUM> are provided on two opposite edges of a surface of the shared shielding cover <NUM>. Correspondingly, among the plurality of end surfaces of the end of the first shielding frame <NUM> that faces toward the shared shielding cover <NUM>, two corresponding end surfaces are provided with extending portions that are inserted in the corresponding slots <NUM>, and other end surfaces of the end of the first shielding frame <NUM> that faces toward the shared shielding cover <NUM> may be in contact with the second surface of the first circuit board <NUM>.

In other examples, one of the first shielding frame <NUM> and the second shielding frame <NUM> may be plugged with the shared shielding cover <NUM>. For example, the shared shielding cover <NUM> is provided with a slot <NUM> on a surface facing toward the second shielding frame <NUM>, and the second shielding frame <NUM> may be inserted into the slot <NUM>. The shared shielding cover <NUM> may be connected to the first shielding frame <NUM> in a non-detachable manner, or the first shielding frame <NUM> abuts against the shared shielding cover <NUM>, or the first shielding frame <NUM> is clamped with the second shielding frame <NUM>, or the first shielding frame <NUM> is clamped with the columns on the shared shielding cover <NUM>. In another example, the shared shielding cover <NUM> is provided with a slot <NUM> on a surface that faces toward the first shielding frame <NUM>, and the first shielding frame <NUM> may be inserted into the slot <NUM>. The shared shielding cover <NUM> may be connected to the second shielding frame <NUM> in a non-detachable manner, or the second shielding frame <NUM> abuts against the shared shielding cover <NUM>, or the second shielding frame <NUM> is clamped with the first shielding frame <NUM>, or the second shielding frame <NUM> is clamped with the columns on the shared shielding cover <NUM>.

<FIG> is an exploded schematic structural diagram of a circuit board assembly according to still another comparative example of this application. <FIG> is a schematic diagram of a cross-sectional structure of a circuit board assembly taken along a G-G direction in <FIG> according to a comparative example of this application.

Referring to <FIG> and <FIG>, in some examples, the second shielding frame <NUM> may be detachably connected to the shared shielding cover <NUM> by a magnetic attraction force. The second shielding frame <NUM> may include a shielding frame body <NUM> and a magnetic attraction portion <NUM>. The magnetic attraction portion <NUM> slidably fits an end portion of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM>, and the magnetic attraction portion <NUM> is further engaged with the shared shielding cover <NUM>. The magnetic attraction portion <NUM> may be a magnet. The first shielding frame <NUM> may be connected to the shared shielding cover <NUM> in a non-detachable manner. Definitely, the first shielding frame <NUM> may abut against, or may be clamped or plugged with the shared shielding cover <NUM>.

The magnetic attraction portion <NUM> may be of a closed annular structure to improve connection reliability. For example, the shielding frame body <NUM> is cylindrical and the magnetic attraction portion is circular. In another example, the shielding frame body <NUM> is prismatic, and the magnetic attraction portion is also prismatic.

Alternatively, opposite sides of an end portion of the shielding frame body <NUM> are each provided with a magnetic attraction portion <NUM>. For example, the shielding frame body <NUM> is cylindrical and the magnetic attraction portion is arc-shaped. In another example, the shielding frame body <NUM> is prismatic and the magnetic attraction portion is elongated.

Alternatively, a plurality of block-shaped magnetic attraction portions <NUM> are provided, and the plurality of magnetic attraction portions <NUM> may be distributed at intervals in a circumferential direction of the shielding frame body <NUM>.

In some examples, the magnetic attraction portion <NUM> has a sliding groove <NUM> that extends axially along the shielding frame body <NUM>. The magnetic attraction portion <NUM> may be provided with a sliding groove <NUM>; alternatively, the magnetic attraction portion <NUM> includes a plurality of plate-like magnets, where two of the magnets are opposite to each other and spaced apart to form a sliding groove <NUM>, and another magnet is connected to end portions of the two magnets to be in contact with the shared shielding cover <NUM>. An end portion of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM> is slidably disposed in the sliding groove <NUM>. This helps increase the contact area between the magnetic attraction portion and the shielding frame body <NUM>, thereby improving the connection reliability.

<FIG> is a first assembly schematic diagram of magnetic attraction portions according to a comparative example of this application. <FIG> is a second assembly schematic diagram of magnetic attraction portions according to a comparative example of this application. The magnetic attraction portion <NUM> on the left side in <FIG> is located in an original position, and the magnetic attraction portion <NUM> on the right side in <FIG> is located in an assembly position in contact with the shared shielding cover <NUM>. The magnetic attraction portion <NUM> on the left side in <FIG> slides away from an original position toward an assembly position, and the magnetic attraction portion <NUM> on the right side in <FIG> is about to reach the assembly position.

Referring to <FIG> and <FIG>, during assembly, an end portion of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM> is inserted into the sliding groove <NUM> of the magnetic attraction portion <NUM>. When the magnetic attraction force between the magnetic attraction portion <NUM> and the shared shielding cover <NUM> is less than or equal to the gravity of the magnetic attraction portion <NUM> (the magnetic attraction portion <NUM> on the left side in <FIG>), the magnetic attraction portion <NUM> may be arranged at the end portion of the shielding frame body <NUM> under the action of the gravity of the magnetic attraction portion <NUM>. The magnetic attraction portion <NUM> may slide toward the shared shielding cover <NUM> under the action of an external force. When the magnetic attraction force between the magnetic attraction portion <NUM> and the shared shielding cover <NUM> is greater than the gravity of the magnetic attraction portion <NUM> (the magnetic attraction portion <NUM> shown in <FIG>), the magnetic attraction portion <NUM> may slide to the assembly position in contact with the shared shielding cover <NUM> under the action of the magnetic attraction force (the magnetic attraction portion <NUM> on the right side in <FIG>). It can be understood that, a smaller distance between the magnetic attraction portion <NUM> and the shared shielding cover <NUM> causes a larger magnetic attraction force between the magnetic attraction portion <NUM> and the shared shielding cover <NUM>.

In other examples, the magnetic attraction portion <NUM> may be disposed on an outer surface of the shielding frame body <NUM>, and the magnetic attraction portion <NUM> can slide relative to the outer surface of the shielding frame body <NUM> to be in contact with the shared shielding cover <NUM>.

In other examples, the magnetic attraction portion <NUM> may be disposed on an inner surface of the shielding frame body <NUM>, and the magnetic attraction portion <NUM> can slide relative to the inner surface of the shielding frame body <NUM> to be in contact with the shared shielding cover <NUM>.

<FIG> is a schematic diagram of a cross-sectional structure of a magnetic attraction portion taken along a G-G direction in <FIG> according to a comparative example of this application. Referring to <FIG>, in order to improve the shielding effect, the surface of the magnetic attraction portion <NUM> may be provided with an electromagnetic shielding layer <NUM> made of an electromagnetic shielding material. When the magnetic attraction portion <NUM> is provided with a sliding groove <NUM>, the magnetic attraction portion <NUM> is provided with an electromagnetic shielding layer <NUM> on a surface facing toward the shared shielding cover <NUM>. The magnetic attraction portion <NUM> is provided with an electromagnetic shielding layer <NUM> on an inner surface facing towards the shielding cavity, or the magnetic attraction portion <NUM> is provided with an electromagnetic shielding layer <NUM> on an outer surface away from the shielding cavity. When the magnetic attraction portion <NUM> is formed by a plurality of magnets connected together, the electromagnetic shielding layers <NUM> are provided on surfaces of the magnets that face toward the shared shielding covers <NUM>. The electromagnetic shielding layer <NUM> may also be provided on a surface of the magnet located on an inner side or outer side of the shielding frame body <NUM>.

Alternatively, the magnetic attraction portion <NUM> includes a plurality of plate-like magnets, where two of the magnets are opposite to each other and spaced apart to form a sliding groove <NUM>, another magnet is connected to end portions of the two magnets to be in contact with the shared shielding cover <NUM>. An end portion of the shielding frame body <NUM> that faces toward the shared shielding cover <NUM> is slidably disposed in the sliding groove <NUM>.

In other examples, the first shielding frame <NUM> may be connected to the shared shielding cover <NUM> by a magnetic attraction force, and the implementation process is similar to that of the foregoing examples. The second shielding frame <NUM> may be connected to the shared shielding cover <NUM> in a non-detachable manner. Definitely, the second shielding frame <NUM> may abut against, or may be clamped or plugged with the shared shielding cover <NUM>.

In other examples, the first shielding frame <NUM> and the second shielding frame <NUM> are separately connected to the shared shielding cover <NUM> by a magnetic attraction force, and the implementation process is similar to that of the foregoing examples.

In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly stipulated and restricted, terms "installation", "joint connection", and "connection" should be understood broadly, which, for example, may be a fixed connection, or may be an indirect connection by using a medium, or may be an internal communication between two components, or may be an interactive relationship between two components. A person of ordinary skill in the art can understand specific meanings of the foregoing terms in the embodiments of this application according to a specific situation.

The embodiments of this application imply that the mentioned apparatus or element needs to have a particular direction and be constructed and operated in the particular direction, and therefore cannot be understood as a limitation on the embodiments of this application. In the description of the embodiments of this application, unless otherwise specifically limited, "a plurality of" means two or more than two.

In the specification, claims, and the foregoing accompanying drawings of the embodiments of this application, the terms "first", "second" are intended to distinguish between similar objects rather than indicating a specific order. It should be understood that data used in this way is interchangeable in a suitable case, so that the embodiments of the embodiments of this application described herein can be implemented in a sequence in addition to the sequence shown or described herein. In addition, the terms "comprising", "having", or any other variant thereof are intended to cover a non-exclusive inclusion.

The term "more" in this specification refers to two or more than two. The term "and/or" in this specification is only an association relationship for describing associated objects, and represents that three relationships may exist, for example, A and/or B may represent the following three cases: A exists separately, both A and B exist, and B exists separately.

Understandably, various reference numerals in the embodiments of this application are merely for differentiation for ease of description, and are not intended to limit the scope of the embodiments of this application.

Claim 1:
A circuit board assembly (<NUM>), comprising: a first circuit board (<NUM>) and a second circuit board (<NUM>) stacked with the first circuit board (<NUM>), wherein the first circuit board (<NUM>) is provided with a first shielding frame (<NUM>) on a surface facing toward the second circuit board (<NUM>), the second circuit board (<NUM>) is provided with a second shielding frame (<NUM>) on a surface facing toward the first circuit board (<NUM>), and opposite end portions of the first shielding frame (<NUM>) and the second shielding frame (<NUM>) are connected to a shared shielding cover (<NUM>), so that the shared shielding cover (<NUM>), the first shielding frame (<NUM>), and the first circuit board (<NUM>) define a first shielding cavity, and the shared shielding cover (<NUM>), the second shielding frame (<NUM>), and the second circuit board (<NUM>) define a second shielding cavity;
wherein at least one of the first shielding frame (<NUM>) and the second shielding frame (<NUM>) comprises: a shielding frame body (<NUM>) and an elastic abutment portion (<NUM>), the elastic abutment portion (<NUM>) is disposed at an end portion of the shielding frame body (<NUM>) that faces toward the shared shielding cover (<NUM>), and the elastic abutment portion (<NUM>) abuts against the shared shielding cover (<NUM>);
wherein the elastic abutment portion (<NUM>) comprises a plurality of elastic plates configured to form a closed ring structure;
wherein at least one of the first shielding frame (<NUM>) and the second shielding frame (<NUM>) is detachably connected to the shared shielding cover (<NUM>).