Insertion loss test assembly and insertion loss test system

Abstract

The utility model provides an insertion loss test assembly and an insertion loss test system. The insertion loss test assembly comprises a housing, a first joint installation structure and a second joint installation structure. The shell is provided with a sliding groove. The first joint mounting structure includes a moving member and a fixed member assembled to the moving member. And the fixing piece is used for fixing the joint. The second joint mounting structure is assembled to one end of the chute. And the moving part and the sliding groove are installed in a sliding mode, and the moving part is used for forming a first variable installation position between the first connector installation structure and the second connector installation structure and used for installing a circuit board. As the moving part and the sliding groove are installed in a sliding mode, the size of the first variable installation position can be changed so as to adapt to test circuit boards of different sizes, the application range of the insertion loss test assembly is widened, the test cost is reduced, and the test period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of insertion loss testing, and in particular to an insertion loss testing component and an insertion loss testing system. Background Art

[0002] Amplifiers are crucial components in electronic circuits. For example, LNAs (Low Noise Amplifiers) are widely used across a wide range of frequency bands due to their low noise, wide bandwidth, and high gain. Currently, insertion loss test enclosures are typically used to test amplifiers and their components to assess insertion loss during signal transmission and control the product's electrical signal quality. Traditional insertion loss test enclosures cannot accommodate amplifiers with varying size requirements (for example, test circuit boards of varying sizes). Different sizes of test enclosures must be manufactured for different amplifier components, increasing testing costs and lengthening testing cycles. Utility Model Content

[0003] The present application provides an insertion loss test component and an insertion loss test system to solve related technical problems.

[0004] An insertion loss test assembly comprises: a housing, a first connector mounting structure, and a second connector mounting structure; the housing is provided with a slide groove; the first connector mounting structure comprises a movable part and a fixed part assembled to the movable part; the fixed part is used to fix the connector; the second connector mounting structure is assembled to one end of the slide groove; the movable part is slidably mounted on the slide groove to form a first variable mounting position between the first connector mounting structure and the second connector mounting structure for mounting a circuit board.

[0005] Furthermore, the fixing member includes a plurality of fixing blocks, and the plurality of fixing blocks are slidably mounted to one side of the moving member; the plurality of fixing blocks form a second variable mounting position for mounting the joint.

[0006] Furthermore, the movable member is provided with a connecting hole, and the fixed block is provided with a connecting groove; the first joint mounting structure further comprises a first connecting member, and the first connecting member passes through the connecting groove and is connected to the connecting hole.

[0007] Furthermore, the fixing block is provided with a plurality of the connecting grooves, and the extension directions of the plurality of connecting grooves are different.

[0008] Furthermore, the housing includes a fixing plate, the fixing plate is fixed to one end of the slide slot, and the second joint mounting structure is assembled to a side of the fixing plate away from the slide slot.

[0009] Furthermore, the slide groove passes through the shell and forms an opening in the shell; the moving member can be slidably connected to the slide groove through the opening.

[0010] Furthermore, the shell includes a box body and a cover body, and the box body and the cover body are assembled to form a closed space.

[0011] Furthermore, it also includes a second connecting member; the box body includes a pair of plates arranged opposite to each other, the pair of plates forming the slide groove, and the plates are provided with long holes; the second connecting member is connected to the moving member through the long holes.

[0012] Furthermore, the shell is made of metal material.

[0013] Furthermore, the housing is provided with a conductive contact surface for electrically connecting with a circuit board.

[0014] Furthermore, the housing is provided with a hole structure for grounding the insertion loss test assembly.

[0015] The present application also provides an insertion loss test system, including a circuit board, a first connector, a second connector and the above-mentioned insertion loss test assembly; the circuit board is assembled to the first variable mounting position; the first connector is fixed to the fixing member, and the second connector is fixed to the second connector mounting structure.

[0016] Furthermore, it also includes a holding strip and a third connecting member, and the third connecting member passes through the holding strip, the circuit board and the shell, so that the holding strip and the shell clamp and fix the circuit board.

[0017] The technical solution provided by this application can achieve at least the following technical effects: Due to the sliding installation of the movable member and the slide groove, the size of the first variable installation position can be changed. The insertion loss test assembly can adapt to test circuit boards of different sizes, thereby expanding the application range of the insertion loss test assembly, reducing testing costs, and shortening the test cycle.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0020] Figure 1 is a structural diagram of an insertion loss test system in an exemplary embodiment of the present application;

[0021] Figure 2 yes Figure 1Partial structural diagram of the insertion loss test system;

[0022] Figure 3 yes Figure 1 Diagram of the assembly of the medium insertion loss test system and a circuit board of another size;

[0023] Figure 4 yes Figure 1 Structural breakdown diagram of the insertion loss test system;

[0024] Figure 5 yes Figure 1 The structure diagram of the middle box;

[0025] Figure 6 yes Figure 1 Structural diagram of the moving parts;

[0026] Figure 7 yes Figure 4 Structural diagram of the fixed block;

[0027] Figure 8 yes Figure 4 Structural diagram of the second joint installation structure.

[0028] Description of the accompanying drawings: housing 10; slide 101; first section 1011; second section 1012; third section 1013; first variable mounting position 102; opening 103; hole structure 104; box body 11; fixing plate 111; first through hole 1111; plate 112; long hole 1121; cover 12; bolt 13; first joint mounting structure 20; second variable mounting position 200; moving member 21; connecting hole 210; first Part 211; second part 212; third part 213; second through hole 214; assembly hole 215; fixing member 22; fixing block 221; base 2211; protrusion 2212; arcuate surface 2213; connecting groove 222; first connecting member 23; second connector mounting structure 30; main body 31; pin 32; second connecting member 40; circuit board 50; first connector 60; second connector 70; pressure strip 80; third connecting member 90. DETAILED DESCRIPTION

[0029] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0030] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0031] Amplifiers are important components in electronic circuits. To control the electrical performance and quality of products, insertion loss testing of amplifiers and their components is currently common practice. Traditional insertion loss testing assemblies are unable to accommodate amplifiers with varying size requirements. Different insertion loss testing assemblies must be manufactured for different amplifiers, increasing testing costs and extending test cycles. This application provides an insertion loss testing assembly and system to address related technical issues.

[0032] like Figure 1 and Figure 2 As shown, the present application provides an insertion loss test assembly, which includes a housing 10, a first connector mounting structure 20 and a second connector mounting structure 30. The housing 10 is provided with a slide 101. The first connector mounting structure 20 includes a moving part 21 and a fixing part 22 assembled to the moving part 21. The fixing part 22 is used to fix the connector. The second connector mounting structure 30 is assembled to one end of the slide 101. The moving part 21 is slidably installed with the slide 101 to form a first variable mounting position 102 between the first connector mounting structure 20 and the second connector mounting structure 30 for mounting a circuit board.

[0033] Since the moving member 21 is slidably installed with the slide slot 101 , the size of the first variable installation position 102 can be changed to adapt to test circuit boards of different sizes, thereby increasing the applicability of the insertion loss test assembly, reducing test costs, and shortening the test cycle.

[0034] The first connector 60 can be an SMA connector (SubMiniature version A connector) or an N-type connector, and the specific type is not limited. The second connector 70 can also be an SMA connector or an N-type connector, and the specific type is also not limited.

[0035] like Figure 4As shown, in one embodiment, the housing 10 may include a box body 11 and a cover body 12. The box body 11 and the cover body 12 are assembled to form a sealed space. This sealed space reduces the impact of the external environment on the test environment, allowing the insertion loss test assembly of this application to adapt to different loss test environments, such as normal temperature environments and low temperature environments. In low temperature environments, the sealed space reduces heat loss, allowing the insertion loss test assembly to function properly.

[0036] The box body 11 and cover 12 can be assembled using bolts 13, providing high installation strength and rapid installation efficiency. Furthermore, the bolted connection facilitates disassembly and facilitates replacement of the circuit board 50 under test, improving the efficiency of insertion loss testing and further shortening the test cycle.

[0037] Specifically, the cover 12 can be rectangular, and the number of bolts 13 can be six. Four bolts 13 are secured to the four corners of the cover 12, and two bolts 13 are secured to the middle of the longer sides of the cover 12, providing a high connection strength for the cover 12. In other embodiments, the fixing method between the box body 11 and the cover 12 is not limited, and can also be a snap-fit ​​connection.

[0038] In one embodiment, the housing 10 may be made of metal material. The metal housing 10 can play a certain electromagnetic shielding role, preventing external electromagnetic interference with the internal enclosed space, thereby improving the accuracy of the insertion loss test.

[0039] At the same time, setting the housing 10 to metal can ensure the electrical connection between the housing 10 and the circuit board, and the housing 10 can be used for grounding without setting an additional grounding point, which simplifies the circuit design. In other embodiments, a conductive contact surface (not shown in the figure) can be provided on the housing 10 for electrical connection with the circuit board. Specifically, the surface of the housing 10 in contact with the circuit board 50 can be gold-plated or conductively oxidized so that the housing 10 and the circuit board 50 are well bonded. In these embodiments, a hole structure 104 can be provided on the housing 10 for grounding the insertion loss test assembly.

[0040] like Figure 5 As shown, the chute 101 may include a first section 1011, a second section 1012, and a third section 1013. The first section 1011, the second section 1012, and the third section 1013 are arranged along the depth direction of the chute 101. The width of the first section 1011 is greater than that of the second section 1012, and the width of the second section 1012 is greater than that of the third section 1013.

[0041] Accordingly, if Figure 6As shown, the moving member 21 may include a first portion 211, a second portion 212, and a third portion 213. The second portion 212 is formed to protrude from the first portion 211. The third portion 213 is formed to protrude from the second portion 212. The first portion 211 cooperates with the first section 1011. The second portion 212 cooperates with the second section 1012. The third portion 213 cooperates with the third section 1013.

[0042] The chute 101 is stepped, and the shape of the moving member 21 matches the shape of the chute 101. The stepped chute 101 can provide positioning when the moving member 21 slides, improve the sliding stability of the moving member 21, and improve the efficiency of installing the moving member 21, further shortening the test cycle. In other embodiments, the chute 101 can be uniform in width to reduce processing difficulty and reduce testing costs.

[0043] In one embodiment, if Figures 3 to 5 As shown, the housing 10 may include a fixing plate 111. Specifically, the fixing plate 111 may be a part of the box body 11. The fixing plate 111 is provided with a first through hole 1111 for passing the tail pin of the second connector 70 so that the second connector 70 is electrically connected to the circuit board. Figure 6 As shown, the moving member 21 is provided with a second through hole 214 for passing the tail pin of the first connector 60 so that the first connector 60 can be electrically connected to the circuit board.

[0044] A fixed plate 111 is secured to one end of the chute 101, and the second connector mounting structure 30 is assembled to the side of the fixed plate 111 facing away from the chute 101. By securing the second connector mounting structure 30 to the fixed plate 111, adjusting the size of the first variable mounting position 102 only requires moving the first connector mounting structure 20. Furthermore, the fixed plate 111 serves as a reference for the sliding movement of the movable member 21, facilitating dimensional measurement of the first variable mounting position 102 and further improving the efficiency of the insertion loss test assembly.

[0045] In other embodiments, the first connector mounting structure 20 and the second connector mounting structure 30 can both be slidably mounted on the slide groove 101, thereby improving the degree of freedom during the insertion loss test. The size of the first variable mounting position 102 and the relative position in the housing 10 can be changed, further improving the applicability of the insertion loss test assembly.

[0046] In one embodiment, if Figure 5As shown, the chute 101 can pass through the housing 10 and form an opening 103 in the housing 10. The moving member 21 can be slidably connected to the chute 101 through the opening 103. By forming the opening 103 in the housing 10, the moving member 21 can be directly installed into the chute 101 along the extension direction of the chute 101, thereby improving the installation efficiency of the moving member 21, further improving the efficiency of the test, and shortening the test cycle.

[0047] In other embodiments, both ends of the chute 101 may be blocked by the housing 10, and the moving member 21 may be installed from the middle of the chute 101. In the embodiment where the housing 10 includes a box body 11 and a cover body 12, since both ends of the chute 101 are blocked, no opening is formed on the box body 11, thereby improving the airtightness of the housing 10 and further reducing external interference with the enclosed space within the housing 10.

[0048] In one embodiment, if Figure 5 As shown, the box body 11 includes a pair of plates 112 arranged opposite to each other. The pair of plates 112 form a slide groove 101. The plate 112 is provided with a long hole 1121. In this embodiment, please refer to Figure 4 As shown, the insertion loss test assembly further includes a second connector 40, which is connected to the movable member 21 through the elongated hole 1121. By fixing the movable member 21, the mounting strength of the movable member 21 is increased, and the movable member 21 is prevented from displacement during the insertion loss test, thereby improving the test efficiency.

[0049] Specifically, the second connecting member 40 can be a bolt. Figure 6 As shown, the movable member 21 is provided with an assembly hole 215. When installing the insertion loss test assembly, the second connecting member 40 can be pre-installed into the assembly hole 215. As the movable member 21 slides within the chute 101, the second connecting member 40 can slide within the elongated hole 1121. After the movable member 21 slides to the preset position, the second connecting member 40 can be fully tightened into the assembly hole 215 to secure the movable member 21.

[0050] The material of the moving member 21 can be metal. Specifically, the material of the moving member 21 can be stainless steel, aluminum alloy, copper alloy, etc. The specific material type of the moving member 21 is not limited.

[0051] In one embodiment, if Figure 1 and 2 As shown, the fixing member 22 may include a plurality of fixing blocks 221, and the plurality of fixing blocks 221 are slidably mounted to one side of the moving member 21. The plurality of fixing blocks 221 surround a second variable mounting position 200 for mounting the joint.

[0052] Since multiple fixed blocks 221 are slidably installed with the movable part 21, the fixed blocks 221 can change the size of the second variable mounting position 200 by sliding, so that the second variable mounting position 200 can adapt to the installation of connectors with different size requirements, thereby improving the applicability of the insertion loss test component, reducing the test cost, and shortening the test cycle.

[0053] In this embodiment, if Figure 4 、 Figure 6 and Figure 7 As shown, a connecting hole 210 may be provided on the moving member 21. The fixing block 221 is provided with a connecting groove 222. The first joint mounting structure 20 further includes a first connecting member 23, which passes through the connecting groove 222 and is connected to the connecting hole 210.

[0054] When assembling the fixed block 221, the first connecting member 23 can be first assembled to the connecting hole 210 through the connecting groove 222 for pre-installation. When the fixed block 221 slides along the connecting groove 222, the first connecting member 23 and the connecting groove 222 can play a guiding and positioning role, thereby improving the installation efficiency of the fixed block 221.

[0055] When the second variable installation position 200 surrounded by the plurality of fixing blocks 221 reaches a preset size, the first connecting member 23 is fixedly connected to the connecting hole 210, and the fixing blocks 221 are clamped and fixed. Specifically, the first connecting member 23 can be a bolt.

[0056] In this embodiment, the fixed block 221 may be provided with multiple connection slots 222 extending in different directions. By providing multiple connection slots 222 extending in different directions, the fixed block 221 can be moved in multiple directions, expanding the range of sizes that the second variable mounting position 200 can change, further reducing testing costs and shortening testing cycles.

[0057] like Figure 4 、 Figure 6 and Figure 7 As shown, the number of connecting holes 210 on the movable member 21 can be four. The number of fixed blocks 221 can be two. On each fixed block 221, the number of connecting grooves 222 can be two. The four connecting grooves 222 are aligned with the four connecting holes 210 one by one. On each fixed block 221, the extending directions of the two connecting grooves 222 can be perpendicular to each other. When installing the joint, the moving direction of the fixed block 221 can be determined according to the size requirements of the joint, and the first connecting member 23 can be inserted into the appropriate connecting groove 222.

[0058] Specifically, in Figure 4In the coordinate system shown, the Z1-Z2 direction represents the vertical direction of the insertion loss test assembly, and the X1-X2 direction represents the front-to-back direction. Of the two connecting slots 222, one extends vertically along the Z1-Z2 direction, and the other extends horizontally along the X1-X2 direction. When the fixing block 221 needs to move vertically, the first connecting member 23 passes through the vertical connecting slot 222. When the fixing block 221 needs to move forward and backward, the first connecting member 23 passes through the horizontal connecting slot 222.

[0059] like Figure 7 As shown, the fixing block 221 may include a base 2211 and a protrusion 2212. The protrusion 2212 is provided with an arcuate surface 2213 that is concave toward the base 2211. The arcuate surfaces of the plurality of fixing blocks 221 together form a circular second variable mounting position 200 for mounting the joint.

[0060] like Figures 1 to 4 As shown, the present application also provides an insertion loss test system, comprising a circuit board 50, a first connector 60, a second connector 70, and the aforementioned insertion loss test assembly. The circuit board 50 is assembled to the first variable mounting position 102. The first connector 60 is fixed to the fixing member 22. The second connector 70 is fixed to the second connector mounting structure 30.

[0061] Because the insertion loss test assembly can adapt to different amplifier components, the insertion loss test system has low testing costs and a short test cycle. The insertion loss test system of this application can be applied to loss testing of low-noise amplifiers in radio telescopes, wireless communications, satellite communications, radar, wireless television, mobile phones, and other applications, regardless of the specific scenario.

[0062] The first joint 60 can be connected to the first joint mounting structure 20 by a pin, and the second joint 70 can be connected to the second joint mounting structure 30 by a pin. The specific structural forms of the first joint mounting structure 20 and the second joint mounting structure 30 can be the same or different.

[0063] Specifically, taking the second joint mounting structure 30 as an example, please refer to Figure 8 As shown, the second connector mounting structure 30 may include a body 31 and a pin 32, and the pin 32 is fixed to the second connector 70. The pin connection has high strength, avoids looseness, and improves the stability of the insertion loss test assembly.

[0064] In one embodiment, if Figure 4As shown, the insertion loss test system may also include a holding strip 80 and a third connector 90. The third connector 90 passes through the holding strip 80, the circuit board 50, and the housing 10, so that the holding strip 80 and the housing 10 clamp and secure the circuit board 50. The provision of the holding strip 80 improves the mounting strength of the circuit board 50 and enhances the stability of the insertion loss test system. Specifically, the third connector 90 can be a bolt, which provides high mounting strength and high assembly and disassembly efficiency.

[0065] In an embodiment where the housing 10 is made of metal or a conductive contact surface is provided on the housing 10, the pressure strip 80 increases the strength of the circuit board 50 mounted to the housing 10, improves the contact stability between the circuit board 50 and the housing 10, ensures the electrical connection between the circuit board 50 and the housing 10, and further improves the stability of the insertion loss test system.

[0066] In one embodiment, there may be two holding strips 80, symmetrically distributed on both sides of the circuit board 50, to provide a better fixation effect. In this embodiment, there may be six third connectors 90, with three third connectors 90 connected to each holding strip 80, to further improve the fixation effect on the circuit board 50. In other embodiments, the number and distribution of holding strips 80 and the number and distribution of third connectors 90 are not limited.

[0067] The material of the bead 80 can be metal with high strength. Specifically, it can be stainless steel, aluminum alloy, copper alloy, etc. The specific material type of the bead 80 is not limited.

[0068] like Figures 3 to 5 As shown, when installing the circuit board 50, first, the circuit board 50 is placed on the housing 10. Then, the pressure strip 80 is fixed to the housing 10 via the third connecting member 90, and the circuit board 50 is clamped and fixed. After that, the moving member 21 is installed in the slide groove and fixed to the housing 10 via the second connecting member 40.

[0069] Next, proceed to connector installation. First, install the first connector 60 to the movable member 21 and the second connector 70 to the fixed plate 111, ensuring that the tail pins of the first connector 60 and the second connector 70 are in close contact with the circuit board 50. Then, secure the first connector 60 with the fixing block 221 and the second connector 70 with the second connector mounting structure 30. Finally, solder the first and second connectors 60 and 70 to the circuitry of the circuit board 50.

[0070] After the circuit board and the connector are installed, the first connector 60 and the second connector 70 can be connected to cables and an insertion loss tester, such as a network analyzer, to perform an insertion loss test.

[0071] Figure 2 and Figure 3 The structural diagrams of the insertion loss test system in different embodiments are shown respectively. Figure 2 In the embodiment shown, the size of the circuit board 50 is relatively large, and the moving member 21 is fixed to one end of the slide slot 101. Figure 3 In the illustrated embodiment, the size of the circuit board 50 is relatively small, and the moving member 21 can be moved through the slide slot 101 to the middle position of the slide slot 101 to adapt to the size of the circuit board 50 .

[0072] During testing, the amplifier components can be placed on the circuit board 50, and the first connector 60 and the second connector 70 can be electrically connected to each other. Alternatively, the first connector 60 and the second connector 70 can be directly electrically connected to perform insertion loss testing of the connectors.

[0073] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. An insertion loss test assembly, characterized in that: include: A housing, a first joint mounting structure and a second joint mounting structure; the housing is provided with a slide groove; The first joint mounting structure includes a moving part and a fixing part assembled to the moving part; the fixing part is used to fix the joint; the second joint mounting structure is assembled to one end of the slide groove; The moving member is slidably mounted on the sliding groove to form a first variable mounting position between the first joint mounting structure and the second joint mounting structure for mounting a circuit board.

2. The insertion loss test assembly according to claim 1, characterized in that: The fixing member includes a plurality of fixing blocks, and the plurality of fixing blocks are slidably mounted to one side of the moving member; the plurality of fixing blocks form a second variable mounting position for mounting the joint.

3. The insertion loss test assembly according to claim 2, characterized in that: The movable member is provided with a connecting hole, and the fixed block is provided with a connecting groove; the first joint mounting structure further comprises a first connecting member, and the first connecting member passes through the connecting groove and is connected to the connecting hole.

4. The insertion loss test assembly according to claim 3, characterized in that: The fixing block is provided with a plurality of connecting grooves, and the extension directions of the plurality of connecting grooves are different.

5. The insertion loss test assembly according to claim 1, characterized in that: The housing includes a fixing plate fixed to one end of the slide slot, and the second joint mounting structure is assembled to a side of the fixing plate facing away from the slide slot.

6. The insertion loss test assembly according to claim 1, characterized in that: The slide groove passes through the housing and forms an opening in the housing; the moving member can be slidably connected to the slide groove through the opening.

7. The insertion loss test assembly according to claim 1, characterized in that: The shell includes a box body and a cover body, and the box body and the cover body are assembled to form a closed space.

8. The insertion loss test assembly according to claim 7, characterized in that: It also includes a second connecting member; the box body includes a pair of plates arranged opposite to each other, the pair of plates forming the slide groove, and the plates are provided with long holes; the second connecting member is connected to the moving member through the long holes.

9. The insertion loss test assembly according to claim 7, characterized in that: The shell is made of metal material.

10. The insertion loss test assembly according to claim 1, characterized in that: The housing is provided with a conductive contact surface for electrically connecting with the circuit board.

11. The insertion loss test assembly according to claim 1, characterized in that: The housing is provided with a hole structure for grounding the insertion loss test assembly.

12. An insertion loss test system, characterized in that: include: A circuit board, a first connector, a second connector, and an insertion loss test assembly according to any one of claims 1 to 11; The circuit board is assembled to the first variable mounting position; the first connector is fixed to the fixing member, and the second connector is fixed to the second connector mounting structure.

13. The insertion loss test system according to claim 12, wherein: It also includes a holding strip and a third connecting member, wherein the third connecting member passes through the holding strip, the circuit board and the shell, so that the holding strip and the shell clamp and fix the circuit board.

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