Floating shielding cavity for ultra-low short board spacing connector

Abstract

A floating shielding cavity for an ultra-low board spacing connector is arranged between a main board and a daughter board which are connected through the connector and comprises a frame body with a solid structure and a shielding cavity defined by the frame body, and the connector needing to be shielded is located in the shielding cavity. The frame body is of a porous structure formed by winding and weaving metal wires, and intersection points of the metal wires are in contact to form a conductive net. According to the utility model, the axial compression capability in the length direction is realized, and the shielding performance reduction caused by elasticity attenuation can be avoided after long-time use, so that high isolation and shielding between low-spacing PCBs and between signals of small connector products become possible.

Description

Technical Field

[0001] The utility model belongs to the field of connectors, and in particular relates to a floating shielding cavity used for an ultra-low board spacing connector. Background Art

[0002] With the development of communication technology, 5G communication antennas and RRUs are now merged into AAUs, which greatly increases channel capacity. At the same time, due to the higher degree of integration of equipment, the requirements for the distribution of devices inside the equipment and the integration of PCB board stacking are getting higher and higher. Ultra-low inter-board connectors are mainly used between parallel boards to connect the main board and the corresponding sub-board to achieve the transmission of high-frequency, low-frequency and other signals between boards. Due to the large number of signal types, different signals will form certain interference, especially the interference of high-frequency signals is an urgent problem to be solved. When general connectors are used, a certain amount of floating is required in the vertical direction. At the same time, due to the large number of inter-board connectors, the sub-board will be arched under the action of the connector. In order to ensure good transmission and shielding effects, higher requirements are put forward for reliable contact between the shielding cavity and the connector in the vertical direction.

[0003] Currently, there are two main types of shielding structures that can provide axial elasticity: shielding springs and conductive rubber.

[0004] The shrapnel structure can achieve a certain vertical floating through the cantilever design, which is suitable for general large board spacing usage scenarios. However, for small size and ultra-low board spacing usage scenarios, if a larger vertical floating is required, the requirement cannot be met due to the limitation of the cantilever length, and the shrapnel easily loses its elasticity at high temperatures and has poor reliability. In particular, if the shrapnel structure is used for shielding cavities, the shielding effect is poor due to the gaps in the shrapnel cavity structure.

[0005] Conductive rubber is achieved by adding a conductive medium to the rubber material. It maintains a certain elasticity of the original rubber while also having a conductive effect, thereby achieving a shielding effect. However, in actual use, due to the doping of the conductive medium in the rubber, the rubber ages and the performance deteriorates after long-term use, and the shielding effect cannot be achieved through long-term use. Utility Model Content

[0006] The purpose of the utility model is to provide a floating shielding cavity for an ultra-low profile board spacing connector, which will not cause a reduction in shielding performance due to elastic force attenuation after long-term use, thereby solving the above-mentioned technical problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a floating shielding cavity for an ultra-low board spacing connector, which is arranged between a main board and a sub-board connected by a connector, and includes a frame with a solid structure and a shielding cavity surrounded by the frame, and the connector to be shielded is located in the shielding cavity; the frame is a porous structure formed by winding and weaving metal wires, and the intersections of the metal wires are in contact to form a conductive mesh.

[0008] The beneficial effects are as follows: with the help of the elasticity of the metal wire and the porous structure formed, the frame has good elasticity in the direction perpendicular to the board surface, and maintains reliable contact with the main board and the sub-board during the floating process, achieving reliable shielding performance within the floating range of the entire connector; the various intersections of the metal wire contact to form a conductive network, avoiding the generation of inductance and ensuring shielding performance.

[0009] The metal wire filling rate of the frame in the natural state is 16%-20%.

[0010] The beneficial effect is that, as a preferred solution, the floating performance and shielding performance of the product can be further guaranteed.

[0011] The frame has a compression amount of not less than 20% of its overall height.

[0012] The beneficial effect is that, as a preferred solution, it can ensure reliable connection contact within a wide range of travel and achieve reliable shielding performance within the floating range of the entire connector.

[0013] The metal wire is in a wavy shape before winding.

[0014] The beneficial effect is that during the compression process, the intersections between the wave crests can be brought into contact with each other and the elasticity of the frame in a direction perpendicular to the plate surface can be ensured.

[0015] The shielding cavity in the frame is a single cavity or multiple cavities.

[0016] The beneficial effect is that a suitable cavity structure can be selected according to actual conditions.

[0017] One end of the frame is in a free state, and the other end is fixed on the sub-board or the main board.

[0018] The two ends of the frame are respectively fixed on the sub-board and the main board.

[0019] The end of the frame is fixed on the sub-board or the main board by welding or bonding.

[0020] Both ends of the frame are in a free state and are clamped between the main board and the sub-board.

[0021] The beneficial effect is that a variety of feasible solutions are provided for the connection between the utility model and the main board and the sub-board, which is conducive to the user to choose according to the needs.

[0022] The beneficial effects of the utility model are as follows: the floating shielding cavity of the utility model is woven from metal wires such as copper alloy wires or stainless steel wires to form a porous, irregular, randomly wound frame structure. The metal wires have the ability to maintain their own shape after heat treatment and have high elasticity. After winding and weaving, the metal wires are in contact with each other in a compressed state to form a transmission network, avoiding the generation of inductance and ensuring good shielding performance. The utility model has an axial compression capacity perpendicular to the board surface direction (i.e., its own length direction), and the shielding performance will not be reduced due to elastic force attenuation after long-term use, making high isolation and shielding between low-spacing PCBs and between signals of small connector products possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the metal wire winding and weaving of the frame body in the utility model;

[0025] Figure 3 It is a schematic diagram of the shape of the metal wire used in the utility model before winding;

[0026] Figure 4 A schematic diagram of a scenario in which the utility model is applied;

[0027] Markings in the figure: 1, frame, 2, shielding cavity, 3, metal wire, 4, main board, 5, daughter board, 6, first connector, 7, second connector, 8, third connector. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0029] A floating shielding cavity for an ultra-low profile connector, wherein the ultra-low profile connector is located between two parallel PCBs, the two PCBs being a main board and a sub-board respectively, and the floating shielding cavity being arranged outside the connector requiring signal shielding to avoid signal interference between the connectors.

[0030] See attached Figure 1 As shown, the floating shielding cavity comprises a frame 1 of a solid structure and a shielding cavity 2 surrounded by the frame 1, and the connector to be shielded is located in the shielding cavity 2. The shielding cavity 2 of the floating shielding cavity is a single cavity or a multi-cavity, for example Figure 1The two cavities shown form a rectangular cavity in the shape of a Chinese character 'ri'. The specific number of shielding cavities can be selected according to the actual situation.

[0031] As Figure 2 shown, the frame 1 is an irregular porous structure randomly wound and woven with conductive and elastic metal wires. When the metal wires are wound, after bending, winding, and weaving, they are then molded under pressure to form a complete shield cavity that is closed on all four sides. When winding, the metal wires are wound around a mold with a specific shape to process a frame with a corresponding shape. After winding and before pressing, there are certain gaps between different turns and layers, and the height after winding is 3 - 5 times the height of the frame 1 after pressing. After pressing, the intersections of the metal wires come into contact to form a conductive network.

[0032] Preferably, when using a metal wire to wind and weave the frame, a single metal wire is used for winding and weaving. This can ensure that there are no breaks in the middle of the metal wire, preventing the overall structure from being damaged and ensuring the transmission of the elasticity of the metal wire. Additionally, from a process perspective, after determining the size of the shield cavity and the filling rate of the metal wire, the length of the wire can be determined. If multiple metal wires are used, there needs to be a certain overlapping area between their endpoints, and it is difficult to control the size of the overlapping area during the winding process, which makes it difficult to control the length of the metal wire.

[0033] The filling rate of the metal wire of the frame 1 is 16% - 20%. The filling rate calculation method is the ratio of the volume V 丝线体积 of the wire used in the product to the volume V 产品体积 of the product. The product volume is the product of the cross-sectional area of the product and the overall length of the product. Since the cross-section of the product is an irregular circle or square, the cross-sectional area is calculated by projection, taking the average value of the sum of the projected areas of any three cross-sections of the product. The frame 1 has a compression amount of not less than 20% of its overall height. The compression amount calculation method is the ratio of the height of the frame 1 after being compressed to the height of the frame 1 in its natural state.

[0034] To ensure the elasticity of the frame 1 after being manufactured, that is, the above-mentioned compression amount, before winding the metal wire 3, heat treatment and wire bending pretreatment are required to form a shape as Figure 3 shown, in a wavy shape; after the metal wire 3 is processed, it forms a shape with certain wire bending round corners, wire bending depth h, and wire bending width L, so that during the compression process, the intersections between the wave peaks can come into contact with each other and ensure the elasticity of the frame 1.

[0035] Preferably, the metal wire 3 of the present invention is a copper alloy wire or a stainless steel wire.

[0036] The usage scenario of the present invention is as Figure 4As shown, between the two PCB boards, a plurality of connectors are provided, namely, a first connector 6, a second connector 7 and a third connector 8, wherein the second connector 7 and the third connector 8 need to be shielded and isolated to avoid mutual interference of the two signals. The floating shielding cavity of the utility model is installed outside the two connectors, and the two ends of the frame 1 of the floating shielding cavity are clamped between the main board 4 and the sub-board 5, or one end is a free end and the other end is welded or bonded to the PCB board, or both ends are welded or bonded to the two PCB boards. In use, due to the porous structure of the frame 1 and the elasticity of the metal wire 3, the entire floating shielding cavity can have good elasticity in the direction perpendicular to the board surface, and the metal wires 3 are in contact with each other to form a transmission network, avoiding the generation of inductance and ensuring shielding performance.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A floating shielding cavity for an ultra-low profile board spacing connector, arranged between a main board and a daughter board connected by the connector, characterized in that: It comprises a frame with a solid structure and a shielding cavity surrounded by the frame, wherein the connector to be shielded is located in the shielding cavity; the frame is a porous structure formed by winding and weaving metal wires, and each intersection of the metal wires contacts to form a conductive network.

2. A floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The metal wire filling rate of the frame in the natural state is 16%-20%.

3. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The frame has a compression amount of not less than 20% of its overall height.

4. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The metal wire is in a wavy shape before winding.

5. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The shielding cavity in the frame is a single cavity or multiple cavities.

6. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: One end of the frame is in a free state, and the other end is fixed on the sub-board or the main board.

7. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The two ends of the frame are respectively fixed on the sub-board and the main board.

8. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: The end of the frame is fixed on the sub-board or the main board by welding or bonding.

9. The floating shielding cavity for an ultra-low profile board spacing connector according to claim 1, characterized in that: Both ends of the frame are in a free state and are clamped between the main board and the sub-board.

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