Electric connection expansion module with improved structure

Abstract

The utility model discloses an electric connection expansion module with an improved structure, a crimping type connector is clamped between a function expansion card and a circuit board, a back plate covers one side of the circuit board back to the crimping type connector, at least two avoiding holes are arranged on the crimping type connector and a plastic body of the circuit board at intervals, and the circuit board is provided with a plurality of through holes. At least two connecting screws penetrate through the receding holes to lock and fix the backboard and the function expansion card, so that an upper contact and a lower contact of a conductive end on the crimping type connector are elastically and tightly abutted against electrical connection points on the surface of the function expansion card and the surface of the circuit board respectively, and a supporting structure is arranged between the backboard and the circuit board. According to the utility model, the technical problem of deformation of the circuit board and the function expansion card is effectively relieved, the communication stability of the function expansion module is ensured, and the reliability of the function expansion module is improved. And the thin development requirement of 3C products is met.

Description

Technical Field

[0001] This utility model relates to a functional expansion module, and more particularly to an improved electrical connection expansion module. Background Technology

[0002] To expand the functionality of the circuit board while maintaining a thin overall thickness, crimp connectors are commonly used to achieve crimp-connection between the expansion card and the circuit board. During assembly, the crimp connector is sandwiched between the expansion card and the circuit board. A backplate is then stacked on the back of the circuit board. Multiple clearance holes are provided on the plastic bodies of the crimp connector and the circuit board. Connecting screws pass through these clearance holes to connect the backplate and the expansion card, ensuring the crimp connector is tightly clamped between them. The upper and lower contact points of several terminals on the crimp connector elastically abut against the electrical connection points on the expansion card and the circuit board, thus enabling signal conduction between the expansion card and the circuit board.

[0003] However, under the combined force of the connecting screw's connecting force G and the normal force F of the crimp connector's terminals, the circuit board and function expansion card will deform and form an arc-shaped structure, which will cause a loss of terminal force and affect contact performance.

[0004] Currently, to address this issue, a reinforcing cover 16 is often added to the top of the expansion card in the expansion module as a support to prevent deformation of the circuit board and the expansion card. However, due to the addition of the reinforcing cover, the overall assembly height H2 of the expansion module in this improved solution is greater than the overall assembly height H1 of the expansion module in the traditional solution. This severely restricts the development needs of 3C products, given the current trend towards thinner and lighter designs. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an improved electrical connection expansion module. This improved electrical connection expansion module can effectively alleviate the technical problem of circuit board and function expansion card deformation, while not increasing the assembly height of the function expansion module, thus meeting the needs of the thin design development of 3C products.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an improved electrical connection expansion module, including a function expansion card, a crimp connector, a circuit board, a back plate, and connecting screws. The crimp connector is sandwiched between the function expansion card and the circuit board. The back plate covers the side of the circuit board facing away from the crimp connector. At least two clearance holes are provided at intervals on the plastic bodies of the crimp connector and the circuit board. At least two connecting screws pass through the clearance holes to lock and fix the back plate and the function expansion card, so that the conductive terminals on the crimp connector extend from the upper and lower contacts on the upper and lower sides of the crimp connector and elastically abut against the electrical connection points on the surfaces of the function expansion card and the circuit board, respectively. A support structure is provided between the back plate and the circuit board. The support structure is located between two adjacent connecting screws. The two ends of the support structure can abut against the opposing surfaces of the back plate and the circuit board to prevent the circuit board from deforming.

[0007] As a further improvement of this utility model, the support structure is a first rib that protrudes upward on the surface of the back plate facing the circuit board.

[0008] As a further improvement of this utility model, the support structure is a second rib that protrudes upward on the surface of the circuit board facing the back plate.

[0009] As a further improvement of this utility model, the support structure is a convex arc surface formed by bending and deforming the back plate toward the circuit board side.

[0010] As a further improvement of this utility model, the connecting screws are arranged at even intervals along the length direction of the functional expansion module to form at least one row, with at least two connecting screws in each row. One row of connecting screws is located in the middle position of the width direction of the crimp connector, or multiple rows of connecting screws are symmetrically distributed in the middle and both sides of the width direction of the crimp connector.

[0011] As a further improvement of this utility model, at least one support structure is provided between two adjacent connecting screws spaced apart along the length direction of the functional expansion module, and multiple support structures are spaced apart along the width direction of the functional expansion module.

[0012] As a further improvement of this utility model, the structure in which the connecting screw passes through the clearance hole to fix the back plate and the function expansion card together is as follows: the back plate is provided with riveting holes that are directly opposite to the clearance holes, and also with a riveting nut. A radially expanding riveting protrusion is formed on the outer circumference of one end of the riveting nut, and riveting teeth are formed on the outer circumference of the riveting protrusion. The riveting protrusion of the riveting nut is riveted into the riveting hole of the back plate, and the riveting teeth are engaged and fixedly connected with the side wall of the riveting hole. The height of the riveting ring of the riveting nut is less than that of the back plate. The plate thickness ensures that the rivet ring does not protrude from the back plate surface facing the circuit board. The portion of the rivet nut extending beyond the back plate surface is accommodated within the clearance holes of the crimp connector and the circuit board, and the length of the portion of the rivet nut extending beyond the back plate surface is less than the sum of the thicknesses of the crimp connector and the circuit board. The plastic body of the function expansion card has through holes that are directly opposite the clearance holes. The connecting screw passes through the through holes and is screwed into the rivet nut. The head of the connecting screw stops on the surface of the plastic body of the function expansion card facing away from the crimp connector.

[0013] As a further improvement of this utility model, the upper and lower sides of the crimp connector are provided with a plurality of raised positioning posts facing each other. Each raised positioning post is distributed on the edge of the plastic body of the crimp connector. The function expansion card, circuit board and back plate are provided with positioning holes for the raised positioning posts to be inserted and positioned.

[0014] The beneficial technical effects of this utility model are as follows: By setting a support structure made of insulating material between the back plate and the circuit board of the functional expansion module, this utility model effectively supports the back of the circuit board, thereby effectively reducing the deformation of the circuit board and the functional expansion card. Furthermore, by setting ribs on the back plate or circuit board to form the support structure, this utility model can, to some extent, offset the stress caused by the deformation of the circuit board and the functional expansion card, thus alleviating the deformation. Additionally, by designing the back plate with a curved structure between adjacent connecting screws, which bends towards the circuit board, the curved structure of the back plate acts as a counter-deformation compensation. This utility model effectively alleviates the technical problem of circuit board and functional expansion card deformation through a simple structure, ensuring a stable connection between the crimp connector terminals and the functional expansion card and circuit board, ensuring the communication stability of the functional expansion module, and simultaneously effectively reducing the overall assembly height of the functional expansion module, fully meeting the needs of the thin design development of 3C products. Attached Figure Description

[0015] Figure 1 An exploded 3D view of a traditional functional expansion module;

[0016] Figure 2 A 3D diagram of a traditional function expansion module;

[0017] Figure 3Before terminal compression Figure 2 Sectional view along line AA;

[0018] Figure 4 for Figure 3 Enlarged view of section B;

[0019] Figure 5 After terminal compression Figure 2 Sectional view along line AA;

[0020] Figure 6 for Figure 5 Enlarged view of section C;

[0021] Figure 7 This is a schematic diagram of the force distribution of a traditional functional expansion module;

[0022] Figure 8 This is a schematic diagram of the stress and deformation of a traditional functional expansion module.

[0023] Figure 9 An exploded view of the existing solution for the functional expansion module;

[0024] Figure 10 A 3D view of the existing solution for the functional expansion module;

[0025] Figure 11 After terminal compression Figure 10 Sectional view along the DD direction;

[0026] Figure 12 A schematic diagram of the stress and deformation of the existing solution for the functional expansion module;

[0027] Figure 13 This is a perspective view of the present utility model;

[0028] Figure 14 This is an exploded perspective view of the first embodiment of this utility model;

[0029] Figure 15 This is a perspective view of the backplate in the first embodiment of this utility model;

[0030] Figure 16 This is a front view of the back panel in the first embodiment of this utility model;

[0031] Figure 17 for Figure 16 Enlarged view of section E in the middle;

[0032] Figure 18 This is a top view of the back plate in the first embodiment of this utility model;

[0033] Figure 19 This is a cross-sectional view of the structural principle of the first embodiment of this utility model;

[0034] Figure 20 for Figure 19 Enlarged view of the middle section (I);

[0035] Figure 21 This is a schematic diagram of the first embodiment of the present invention under stress and deformation.

[0036] Figure 22 This is a cross-sectional view of the structural principle of the second embodiment of this utility model;

[0037] Figure 23 for Figure 22 Enlarged view of the middle J section;

[0038] Figure 24 This is a schematic diagram of the second embodiment of the present invention under stress and deformation.

[0039] Figure 25 This is a front view of the back panel in the third embodiment of this utility model;

[0040] Figure 26 This is a top view of the back plate in the third embodiment of this utility model;

[0041] Figure 27 This is a cross-sectional view of the structural principle of the third embodiment of this utility model;

[0042] Figure 28 A simplified linear spring model used for CAE simulation analysis was adopted for the three schemes;

[0043] Figure 29 for Figure 28 Enlarged view of the central X-section. Detailed Implementation

[0044] Example: An improved electrical connection expansion module includes a function expansion card 1, a crimp connector 2, a circuit board 3, a backplate 4, and connecting screws 5. The crimp connector 2 is sandwiched between the function expansion card 1 and the circuit board 3. The backplate 4 covers the side of the circuit board 3 facing away from the crimp connector 2. At least two clearance holes 6 are provided at intervals on the plastic bodies of the crimp connector 2 and the circuit board 3. At least two connecting screws 5 pass through the clearance holes 6 to lock and fix the backplate 4 to the function expansion card 1, so that the conductive terminals 7 on the crimp connector 2 extend from the upper contacts 71 and lower contacts 72 on the upper and lower sides of the crimp connector 2 and elastically abut against the electrical connection points 8 on the surfaces of the function expansion card 1 and the circuit board 3, respectively. A support structure is provided between the backplate 4 and the circuit board 3. The support structure is located between two adjacent connecting screws 5. The two ends of the support structure can abut against the opposing surfaces of the backplate 4 and the circuit board 3 to prevent the circuit board 3 from deforming.

[0045] During assembly, the function expansion card 1, crimp connector 2, circuit board 3, and backplate 4 are stacked sequentially from top to bottom. Then, the backplate 4 and function expansion card 1 are fixed together by passing the connecting screws 5 through the clearance holes 6 on the plastic bodies of the crimp connector 2 and circuit board 3. The support structure is placed between the backplate 4 and the circuit board 3, and the support structure supports the circuit board 3. When the connecting screws 5 are tightened, the circuit board 3 is supported by the support structure, which can offset the stress that causes the circuit and function expansion card 1 to deform to a certain extent, thereby relieving the deformation of the circuit and function expansion card 1. This ensures that the upper contact 71 and lower contact 72 of the crimp connector 2 terminals are in stable contact with the electrical connection points 8 on the surface of the function expansion card 1 and circuit board 3, so as to maintain stable communication when the function expansion module is used.

[0046] The supporting structure is a first rib 9 that protrudes upward on the surface of the back plate 4 facing the circuit board 3. The first rib 9 can be integrally formed on the surface of the back plate 4. The cross-section of the first rib 9 can be of various shapes, such as circular, square, rectangular, elliptical, etc. After the connecting screw 5 is tightened, it plays an effective supporting role for the circuit board 3.

[0047] The supporting structure is a second rib 10 that protrudes upward on the surface of the circuit board 3 facing the back plate 4. The second rib 10 can be integrally formed on the back of the plastic body of the circuit board 3, or pasted on the back of the plastic body. The cross-section of the second rib 10 can be various shapes, such as circular, square, rectangular, elliptical, etc. After the connecting screw 5 is tightened, it plays an effective supporting role for the circuit board 3.

[0048] The supporting structure is a convex arc surface 11 formed by bending and deforming the back plate 4 towards the circuit board 3. During the forming process, the back plate 4 itself has an arc structure that deforms in the opposite direction, which can play a role in compensating for the reverse deformation, thereby reducing the deformation of the circuit board 3 and the function expansion card 1.

[0049] The connecting screws 5 are arranged at even intervals along the length of the functional expansion module to form at least one row, with at least two connecting screws 5 in each row. One row of connecting screws 5 is located in the middle of the width of the crimp connector 2, or multiple rows of connecting screws 5 are symmetrically distributed in the middle and on both sides of the width of the crimp connector 2. In common functional expansion modules, three connecting screws 5 are arranged in a row in the middle along the length of the functional expansion module, and these three connecting screws 5 realize the assembly connection of the entire module.

[0050] At least one support structure is provided between two adjacent connecting screws 5 arranged at intervals along the length direction of the functional expansion module, and multiple support structures are arranged at intervals along the width direction of the functional expansion module. This allows the support structures to be evenly distributed in the area of ​​the circuit board 3 with the greatest deformation, thereby achieving effective support for the circuit board 3. For example, two, three, or more support structures can be provided between two adjacent connecting screws 5 arranged along the length direction of the functional expansion module. These support structures are arranged along the width direction of the functional expansion module and form a symmetrical arrangement, which can effectively support the deformation area of ​​the circuit board 3.

[0051] The structure in which the connecting screw 5 passes through the clearance hole 6 to fix the back plate 4 and the function expansion card 1 together is as follows: The back plate 4 is provided with riveting holes that are directly opposite to the clearance holes 6, and also has a riveting nut 12. One end of the riveting nut 12 has a radially outwardly expanding riveting protrusion formed on its outer circumference, and the outer circumference of the riveting protrusion has riveting teeth. The riveting protrusion of the riveting nut 12 is riveted into the riveting hole of the back plate 4, and the riveting teeth are engaged and fixedly connected with the side wall of the riveting hole. The height of the riveting ring of the riveting nut 12 is less than the thickness of the back plate 4 so that the riveting ring does not protrude. On the surface of the backplate 4 facing the circuit board 3, the portion of the rivet nut 12 extending out of the backplate 4 is accommodated within the clearance hole 6 of the crimp connector 2 and the circuit board 3, and the length of the portion of the rivet nut 12 extending out of the backplate 4 is less than the sum of the thicknesses of the crimp connector 2 and the circuit board 3. The plastic body of the function expansion card 1 is provided with through holes 13 that are directly opposite to the clearance holes 6. The connecting screw 5 passes through the through holes 13 and is screwed to the rivet nut 12. The head of the connecting screw 5 is stopped on the surface of the plastic body of the function expansion card 1 facing away from the crimp connector 2.

[0052] The crimp connector 2 has multiple raised positioning posts 14 facing each other on its upper and lower sides. These posts are distributed along the edge of the plastic body of the crimp connector 2. The expansion card 1, circuit board 3, and backplate 4 each have corresponding positioning holes 15 for the raised positioning posts to be inserted and positioned. During assembly, the positioning posts 14 are inserted into the positioning holes 15 for positioning, facilitating the tightening of the connecting screws 5.

[0053] The deformation of the functional expansion module using the traditional solution, the functional expansion module using the existing improved solution (adding a reinforcing cover plate), and the functional expansion module using the solution of this utility model were analyzed using CAE simulation analysis software. Due to the large number of terminals affecting the calculation time during CAE analysis, a simplified linear spring model with Spring stiffness = 1N (100gF) / mm was used (e.g., ...). Figure 28 (as described above) to obtain rapid analysis results, which are shown in the table below:

[0054]

[0055] Existing improvement plan: Install a reinforcing top cover and use a flat back plate 4. Simulation results show that the total gap is 0.137mm.

[0056] Traditional solution: No top cover installed, using a flat backplate 4, simulation results show that the total gap is 0.21mm;

[0057] The present invention is as follows: without the top cover, a back plate with convex ribs is used. The simulation results show that the total gap is 0.127 mm.

[0058] The above analysis results show that adding a rib in the middle of the backplate 4 can achieve better results than adding a topcover, and can effectively reduce the module assembly height.

Claims

1. An improved electrical connection expansion module, comprising a functional expansion card (1), a crimp connector (2), a circuit board (3), a backplate (4), and connecting screws (5), wherein the crimp connector is sandwiched between the functional expansion card and the circuit board, the backplate covers the side of the circuit board facing away from the crimp connector, and at least two clearance holes (6) are provided at intervals on the plastic bodies of the crimp connector and the circuit board, and at least two connecting screws pass through the clearance holes to lock and fix the backplate to the functional expansion card, such that the conductive terminals (7) on the crimp connector protrude from the upper contacts (71) and lower contacts (72) on the upper and lower sides of the crimp connector and elastically abut against the electrical connection points (8) on the surface of the functional expansion card and the circuit board, characterized in that: A support structure is provided between the back plate and the circuit board. The support structure is located between two adjacent connecting screws. Both ends of the support structure can press tightly against the opposing surfaces of the back plate and the circuit board to prevent the circuit board from deforming.

2. The structurally improved electrical connection expansion module according to claim 1, characterized in that: The support structure is a first rib (9) that protrudes upward on the surface of the back plate facing the circuit board.

3. The structurally improved electrical connection expansion module according to claim 1, characterized in that: The support structure is a second rib (10) that protrudes upward on the surface of the circuit board facing the back plate.

4. The structurally improved electrical connection expansion module according to claim 1, characterized in that: The supporting structure is a convex arc surface (11) formed by bending and deforming the back plate toward the circuit board side.

5. The structurally improved electrical connection expansion module according to claim 2, 3 or 4, characterized in that: The connecting screws are arranged at even intervals along the length of the functional expansion module to form at least one row, with at least two connecting screws in each row. One row of connecting screws is located in the middle of the width direction of the crimp connector, or multiple rows of connecting screws are symmetrically distributed in the middle and both sides of the width direction of the crimp connector.

6. The structurally improved electrical connection expansion module according to claim 5, characterized in that: The two adjacent connecting screws arranged at intervals along the length direction of the functional expansion module are provided with at least one support structure in between, and the multiple support structures are arranged at intervals along the width direction of the functional expansion module.

7. The structurally improved electrical connection expansion module according to claim 1, characterized in that: The structure in which the connecting screw passes through the clearance hole to fix the back plate and the function expansion card together is as follows: The back plate is provided with riveting holes that are directly opposite the clearance holes, and also with a riveting nut (12). One end of the riveting nut has a radially outwardly expanding riveting protrusion formed on its outer circumference, and the outer circumference of the riveting protrusion has riveting teeth. The riveting protrusion of the riveting nut is riveted into the riveting hole of the back plate, and the riveting teeth are engaged and fixedly connected with the side wall of the riveting hole. The height of the riveting ring of the riveting nut is less than the thickness of the back plate so that the riveting... The ring does not protrude from the surface of the back plate facing the circuit board. The portion of the rivet nut extending from the surface of the back plate is accommodated in the clearance hole of the crimp connector and the circuit board. The length of the portion of the rivet nut extending from the surface of the back plate is less than the sum of the thicknesses of the crimp connector and the circuit board. The plastic body of the functional expansion card is provided with through holes (13) that are directly opposite the clearance holes. The connecting screw passes through the through holes and is screwed to the rivet nut. The head of the connecting screw is stopped on the surface of the plastic body of the functional expansion card facing away from the crimp connector.

8. The structurally improved electrical connection expansion module according to claim 1, characterized in that: The crimp connector has multiple raised positioning posts (14) facing each other on both the upper and lower sides. Each raised positioning post is distributed on the edge of the plastic body of the crimp connector. The function expansion card, circuit board and back plate are provided with positioning holes (15) for the raised positioning posts to be inserted and positioned.

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