A ribbon cable signal transmission assembly
By employing a ribbon cable signal transmission assembly with shielded metal parts and mechanical terminal top contacts in the FPC electrical connector, the problems of poor shielding performance and complex soldering are solved, thereby improving signal transmission quality and equipment stability, while reducing production difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CVILUX TECH SUZHOU
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-26
AI Technical Summary
The shielding performance of existing FPC electrical connectors is poor, which causes external electromagnetic interference to couple into the internal components of the connector, affecting signal transmission quality and equipment stability. At the same time, the complex PCB layout and high soldering difficulty lead to production cost and reliability issues.
A ribbon cable signal transmission assembly was designed, which uses shielded metal parts to conduct electricity through mechanical terminal top contacts, eliminating the soldering step with the PCB board. By combining the FFC ribbon cable and FPC electrical connector, a complete shielding structure is formed, which increases the mechanical connection strength and electrical connection reliability.
It effectively blocks external electromagnetic interference, improves signal transmission quality and stability, reduces production complexity and difficulty, ensures the positional accuracy of mechanical terminals and the reliability of electrical connections, reduces problems such as poor soldering, and improves equipment performance and stability.
Smart Images
Figure CN224288791U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic component manufacturing technology, and in particular to a ribbon cable signal transmission assembly. Background Technology
[0002] In modern electronic devices, with the continuous enrichment of product functions and the trend towards miniaturization and lightweight design, higher requirements are placed on the performance and structural design of internal connection components. As a key component for realizing the internal circuit connections of electronic devices, the performance of the ribbon cable signal transmission assembly directly affects the stability and reliability of the entire device.
[0003] The ribbon cable signal transmission assembly consists of an FPC electrical connector and an FFC ribbon cable. The quality of the shielding performance of the FPC electrical connector directly affects the electromagnetic compatibility of the entire electronic device. If the shielding performance of the FPC electrical connector is poor, external electromagnetic interference can easily couple into the connector, thereby interfering with signal transmission, leading to signal distortion, increased bit error rate, and other problems, seriously affecting the normal operation of the electronic device.
[0004] Currently, FPC electrical connectors mainly consist of several parts: an insulating base, terminals, mechanical terminals, a flip-type pressure-applying component, and a shielding metal component. When the FPC cable is inserted into the insulating base, it is locked in place by the flip-type pressure-applying component. The FPC cable is elastically pressed and electrically connected by multiple terminals. The flip-type pressure-applying component uses multiple linear array mechanical terminals to elastically press and limit movement. The shielding metal component covers the insulating base and is grounded to form the first electromagnetic shielding layer. Multiple linear array mechanical terminals are soldered to the PCB board and independently grounded to form the second electromagnetic shielding layer. The PCB board needs to have multiple grounding solder points pre-laid to achieve the grounding design of the mechanical terminals. Furthermore, in actual production, PCB board layout space is often limited. Too many solder points significantly increase the complexity of the PCB board's circuit framework design and manufacturing, leading to high production costs. In addition, soldering is extremely difficult and labor-intensive. Furthermore, the soldering quality between the mechanical terminals and the PCB board is difficult to guarantee consistently. In actual soldering operations, problems such as cold solder joints and detachment frequently occur, leading to ineffective grounding of the mechanical terminals. This prevents the second electromagnetic shielding layer from functioning properly and fails to effectively block external electromagnetic interference from affecting the internal circuitry. In electronic devices with high electromagnetic compatibility requirements, this can cause serious problems, impacting the device's performance and stability. Therefore, it is urgent for technicians to address these issues. Utility Model Content
[0005] Therefore, in view of the above-mentioned existing problems and defects, the development and design team of this utility model collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by the development and design team members, which ultimately led to the emergence of this ribbon cable signal transmission assembly.
[0006] To address the aforementioned technical problems, this utility model relates to a ribbon cable signal transmission assembly, composed of an FPC electrical connector and an FFC ribbon cable. The FPC electrical connector includes an insulating base, terminals, mechanical terminals, a flip-type pressure-applying component, a front locking component, a rear locking component, and a shielding metal component. The insulating base simultaneously forms ribbon cable insertion slots, terminal insertion slots, and mechanical terminal insertion slots. Multiple mechanical terminals work together to elastically apply pressure and limit the flip-type pressure-applying component. When the FFC ribbon cable is inserted into the ribbon cable insertion slot and the flip-type pressure-applying component is locked, the FFC ribbon cable is elastically pressed by multiple terminals, resulting in electrical conductivity. Both the front and rear locking components are mounted on the insulating base and work together to lock the flip-type pressure-applying component. The shielding metal component is grounded, and after it is assembled in a snap-fit manner relative to the insulating base, each mechanical terminal contacts the shielding metal component, resulting in electrical conductivity.
[0007] As a further improvement to the technical solution of this utility model, the shielding metal part is a sheet metal part, which is composed of a vertical bending arm, an upper contact arm, a front grounding pin, and a rear grounding pin connected together. The vertical bending arm, the front grounding pin, and the rear grounding pin are all extended from the upper contact arm and bent at 90°. Along its length, the vertical bending arm has a series of punched inward bending fingers. The insulating rubber base also has a front insertion slot for inserting the front grounding pin and a rear insertion slot for inserting the rear grounding pin. After the shielding metal part is assembled with the insulating rubber base, the upper contact arm contacts the top wall of the insulating rubber base, and the tail ends of each mechanical terminal are elastically contacted by the punched inward bending fingers. Both the front grounding pin and the rear grounding pin penetrate the insulating rubber base, and both are soldered to the PCB board and grounded.
[0008] As a further improvement to the technical solution of this utility model, a first left-side anti-detachment protrusion and a first right-side anti-detachment protrusion are formed by extending outward from the front and rear sidewalls of the front grounding pin, respectively. A second left-side anti-detachment protrusion and a second right-side anti-detachment protrusion are formed by extending outward from the front and rear sidewalls of the rear grounding pin, respectively. After the shielding metal part is assembled with the insulating rubber seat in a snap-fit manner, a local area of the insulating rubber seat undergoes adaptive yielding deformation, and the first left-side anti-detachment protrusion, the first right-side anti-detachment protrusion, the second left-side anti-detachment protrusion, and the second right-side anti-detachment protrusion are recessed into it.
[0009] As a further improvement to the technical solution of this utility model, a front material removal groove is formed on the insulating rubber base at a set distance from the front insertion slot. A rear material removal groove is formed on the insulating rubber base at a set distance from the rear insertion slot.
[0010] As a further improvement to the technical solution of this utility model, the FFC cable includes a conductive transmission unit, a short-state shield, and a long-state shield. Both the short-state and long-state shields are grounded, working together to form an electromagnetic wave isolation barrier around the conductive transmission unit, and creating a wired port area to partially expose the conductive transmission unit. The conductive transmission unit consists of parallel power transmission wires and signal transmission wires. Multiple signal transmission wires are centrally arranged, while power transmission wires are positioned on either side. After the FFC cable is assembled with the FPC electrical connector, a single power transmission wire is simultaneously pressed against at least two terminals.
[0011] As a further improvement to the technical solution of this utility model, the width of the power transmission wire is W1 and the width of the signal transmission wire is W2, then W1≥2.5W2, and 0.5mm≤W1≤0.85mm.
[0012] In practical applications, the ribbon cable signal transmission assembly disclosed in this utility model can achieve at least the following beneficial technical effects, specifically:
[0013] 1) After the shielding metal parts are grounded, they are electrically connected to each mechanical terminal through mutual contact to form a complete shielding structure. This shielding structure can effectively block external electromagnetic interference from entering the FPC electrical connector, and at the same time prevent the internally transmitted electrical signals from generating electromagnetic radiation to the outside, thereby improving the quality and stability of signal transmission and reducing the impact of electromagnetic interference on surrounding electronic equipment;
[0014] 2) Each mechanical terminal is assembled within an insulating base using an embedded method, eliminating the need for soldering to the PCB board. Its translational freedom is limited by the shielding metal component. This reduces the soldering steps in the FPC electrical connector production process, lowering the complexity and difficulty of production operations. Furthermore, thanks to the shielding metal component, the positional accuracy of the mechanical terminals during operation is effectively guaranteed, and the electrical connection between the mechanical terminals and the shielding metal component is ensured to be more stable and reliable. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a three-dimensional schematic diagram of the ribbon cable signal transmission assembly disclosed in this utility model.
[0017] Figure 2 This is a three-dimensional schematic diagram of the FPC electrical connector in the ribbon cable signal transmission assembly disclosed in this utility model.
[0018] Figure 3 yes Figure 2 Top view.
[0019] Figure 4 This is a three-dimensional schematic diagram of the insulating rubber base in the ribbon cable signal transmission assembly disclosed in this utility model.
[0020] Figure 5 This is a three-dimensional schematic diagram of the mechanical terminals in the ribbon cable signal transmission assembly disclosed in this utility model.
[0021] Figure 6 This is a three-dimensional schematic diagram of the shielding metal component in the cable signal transmission assembly disclosed in this utility model.
[0022] Figure 7 This is a three-dimensional schematic diagram of the shielding metal component in the cable signal transmission assembly disclosed in this utility model from another perspective.
[0023] Figure 8 yes Figure 6 A magnified view of part of I.
[0024] Figure 9 yes Figure 3 AA sectional view.
[0025] Figure 10 yes Figure 3 BB cross-sectional view.
[0026] Figure 11 yes Figure 3 CC section view.
[0027] Figure 12 This is a three-dimensional schematic diagram of the FFC cable in the cable signal transmission assembly disclosed in this utility model.
[0028] Figure 13 yes Figure 12 A magnified view of part II.
[0029] Figure 14 This is a schematic diagram showing the state of each terminal in the ribbon cable signal transmission assembly disclosed in this utility model after it has been pressed against the conduction transmission unit.
[0030] Figure 15 yes Figure 14 A magnified view of part III.
[0031] 1-FPC electrical connector; 11-Insulating base; 111-Cable insertion slot; 112-Terminal mounting slot; 113-Mechanical terminal mounting slot; 114-Front insertion slot; 115-Rear insertion slot; 116-Front ejector slot; 117-Rear ejector slot; 12-Terminal; 13-Mechanical terminal; 14-Flipping pressure component; 15-Front locking component; 16-Rear locking component; 17-Shielding metal component; 171-Vertical bending arm; 1 711-Punching inner bending finger; 172-Upper mounting arm; 173-Front grounding foot; 1731-First left anti-detachment protrusion; 1732-First right anti-detachment protrusion; 174-Rear grounding foot; 1741-Second left anti-detachment protrusion; 1742-Second right anti-detachment protrusion; 2-FFC cable; 21-Conduction transmission unit; 211-Power transmission wire; 212-Signal transmission wire; 22-Short-state shield; 23-Long-state shield. Detailed Implementation
[0032] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0033] The contents disclosed in this utility model will be further described in detail below with reference to specific embodiments. Figure 1 A perspective view of the ribbon cable signal transmission assembly disclosed in this utility model is shown, which is composed of an FPC electrical connector 1 and an FFC ribbon cable 2. The FPC electrical connector 1 and the FFC ribbon cable 2 cooperate with each other to allow current to flow smoothly between different circuit parts, ensuring the transmission of electrical signals between various components of the electronic device, thereby supporting the normal operation of the device.
[0034] like Figure 2 , Figure 3 , Figure 9As shown, the FPC electrical connector 1 mainly consists of several parts, including an insulating base 11, terminals 12, mechanical terminals 13, a flip-type pressure-applying component 14, a front locking component 15, a rear locking component 16, and a shielding metal component 17. The insulating base 11 simultaneously forms a cable insertion groove 111, a terminal insertion groove 112, and a mechanical terminal insertion groove 113 (e.g., ...). Figure 4 (As shown in the diagram). Multiple mechanical terminals 13 are arranged in a linear array and work together to apply elastic pressure, and a limiting flip-type pressure member 14 is engaged. When the FFC cable 2 is inserted into the cable insertion slot 111 and the flip-type pressure member 14 is locked, the FFC cable 2 is elastically pressed by multiple terminals 12 and electrically connected (as shown in the diagram). Figure 14 , Figure 15 (As shown in the diagram). Both the front locking member 15 and the rear locking member 16 are mounted on the insulating base 11, and they work together to lock the flipping pressure member 14. The shielding metal member 17 is grounded, and after it is assembled in a snap-fit manner relative to the insulating base 11, each mechanical terminal 13 is in contact with the shielding metal member 17 and electrically connected.
[0035] like Figures 6-8 As shown, the shielding metal part 17 is a sheet metal part, which is formed by connecting a vertical bending arm 171, an upper contact arm 172, a front grounding foot 173, and a rear grounding foot 174. The vertical bending arm 171, the front grounding foot 173, and the rear grounding foot 174 all extend from the upper contact arm 172 and are bent at 90°. Along its length, the vertical bending arm 171 has a series of punched inwardly bent fingers 1711. For example... Figure 4 As shown, the insulating base 11 has a front insertion slot 114 for inserting the front grounding pin 173 and a rear insertion slot 115 for inserting the rear grounding pin 174. After the shielded metal part 17 is assembled with the insulating base 11, the upper abutment arm 172 contacts the top wall of the insulating base 11, and the tail ends of each mechanical terminal 13 are elastically contacted by the punched inner bending finger 1711, thus achieving electrical conduction. Both the front grounding pin 173 and the rear grounding pin 174 penetrate the insulating base 11, and both are soldered to the PCB board and grounded.
[0036] In the above technical solution, after the shielding metal part 17 is grounded, it is electrically connected to each mechanical terminal 13 through mutual contact to form a complete shielding structure. This effectively blocks external electromagnetic interference from entering the FPC electrical connector, while also preventing the internally transmitted electrical signals from generating electromagnetic radiation to the outside, thereby improving the quality and stability of signal transmission and reducing the impact of electromagnetic interference on surrounding electronic equipment.
[0037] Furthermore, each mechanical terminal 13 is assembled into the insulating base 11 by an embedded method, eliminating the need for soldering to the PCB board, and its translational freedom is limited by the shielding metal part 17. As... Figure 5 As shown, the mechanical terminal 13 eliminates the grounding solder pad (shown as a dashed line) found in conventional designs. This reduces the soldering steps in the FPC electrical connector 1 production process, lowering the complexity and difficulty of production operations. Furthermore, thanks to the shielding metal part 17, the positional accuracy of the mechanical terminal 13 during operation is effectively guaranteed, and the electrical connection between the mechanical terminal 13 and the shielding metal part 17 is made more stable and reliable, thus ensuring proper grounding of each mechanical terminal 13.
[0038] It is also important to note that, thanks to the presence of the shielding metal part 17, the top wall of the insulating base 11 is continuously pressed against it. This effectively ensures that the top wall of the insulating base 11 maintains good flatness during long-term use, preventing it from "arching" due to uneven stress or external forces, and ensuring that the FPC electrical connector can perform normally.
[0039] According to feedback from assembly components, during the transit period of the FPC electrical connector at the workstation before formal soldering to the PCB board, the shielding metal part 17 frequently becomes loose or falls off from the insulating base 11, which inevitably affects the smooth progress of subsequent soldering and fixing processes to the PCB board. Therefore, as a further optimization of the above technical solution, such as... Figure 6 , Figure 7 As shown, a first left-side anti-detachment protrusion 1731 and a first right-side anti-detachment protrusion 1732 extend outward from the front and rear sidewalls of the front grounding pin 173, respectively. A second left-side anti-detachment protrusion 1741 and a second right-side anti-detachment protrusion 1742 extend outward from the front and rear sidewalls of the rear grounding pin 174, respectively. After the shielding metal part 17 is assembled with the insulating base 11 in a snap-fit manner, a local area of the insulating base 11 undergoes adaptive yielding deformation, and the first left-side anti-detachment protrusion 1731, the first right-side anti-detachment protrusion 1732, the second left-side anti-detachment protrusion 1741, and the second right-side anti-detachment protrusion 1742 are all sunk into it (e.g., Figure 10 , Figure 11 (As shown in the diagram). This structure, similar to a mortise and tenon joint in mechanics, greatly increases the mechanical connection strength between the shielding metal part 17 and the insulating base 11. Compared to ordinary simple snap-fit connections, it can withstand greater external forces such as pulling and vibration.
[0040] Furthermore, considering the need to balance the wall thickness of the insulating adhesive base and improve the injection molding quality of the insulating adhesive base 11, as a further optimization of the above technical solution, such as Figure 4As shown, a front ejector groove 116 is formed on the insulating base 11 near the front insertion slot 114. A rear ejector groove 117 is formed on the insulating base near the rear insertion slot 115. In this way, during the injection molding process, the wall thickness of the insulating base 11 is ensured to be more uniform, so as to reduce the uneven shrinkage caused by material accumulation.
[0041] Figure 12 A three-dimensional schematic diagram of the FFC cable disclosed in this utility model is shown. It can be seen that the FFC cable 2 is mainly composed of several parts, including a transmission unit 21, a short-state shield 22, and a long-state shield 23. Both the short-state shield 22 and the long-state shield 23 are grounded, working together to form an electromagnetic wave isolation barrier around the transmission unit 21, and creating a wired port area to partially expose the transmission unit 21. The transmission unit 21 consists of parallel power transmission conductors 211 and signal transmission conductors 212. Multiple signal transmission conductors 212 are centrally located, while the power transmission conductors 211 are positioned on either side. This effectively reduces the impact of external interference on the signal transmission conductors 212, ensuring accurate and rapid data transmission, maintaining signal integrity, and improving the quality and efficiency of data transmission.
[0042] As a further optimization of the above technical solution, the power transmission conductor 211 is preferably a tin-plated flat copper wire, and it has been widened, specifically as follows: Figure 13 As shown, the width of the power transmission wire 211 is W1, and the width of the signal transmission wire 212 is W2. Therefore, W1 ≥ 2.5W2, and 0.5mm ≤ W1 ≤ 0.85mm. After the FFC cable 2 is fully assembled with the FPC connector 1, the single power transmission wire 211 is simultaneously pressed against both terminals 12 (e.g., ...). Figure 14 , Figure 15 (As shown in the diagram). In this way, on the one hand, the current shunting effect of the ribbon cable signal transmission assembly is optimized, greatly improving its current transmission capability; on the other hand, the number of power transmission contact points of the power transmission conductor 211 is multiplied, thereby significantly reducing contact resistance and reducing problems such as heat generation and voltage drop caused by poor contact, making it easier to pass the temperature rise test during the performance testing phase.
[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A ribbon cable signal transmission assembly, comprising an FPC electrical connector and an FFC ribbon cable; characterized in that, The FPC electrical connector includes an insulating base, terminals, mechanical terminals, a flip-type pressure-applying component, a front locking component, a rear locking component, and a shielding metal component. The insulating base is simultaneously formed with a cable insertion slot, a terminal insertion slot, and a mechanical terminal insertion slot. Multiple mechanical terminals work together to elastically apply pressure and limit the flip-type pressure-applying component. When the FPC cable is inserted into the cable insertion slot and the flip-type pressure-applying component is locked, the FPC cable is elastically pressed by multiple terminals and electrically connected. Both the front and rear locking components are mounted on the insulating base and work together to lock the flip-type pressure-applying component. The shielding metal component is grounded, and after it is assembled with the insulating base, each mechanical terminal contacts the shielding metal component and is electrically connected.
2. The ribbon cable signal transmission assembly according to claim 1, characterized in that, The shielding metal component is a sheet metal part, which is formed by connecting a vertical bending arm, an upper contact arm, a front grounding pin, and a rear grounding pin; the vertical bending arm, the front grounding pin, and the rear grounding pin are all extended from the upper contact arm and bent at 90°; along Along its length, the vertical bending arm is formed with a series of punched inward bending fingers; the insulating rubber base is simultaneously formed with a front insertion slot for inserting the front grounding pin and a rear insertion slot for inserting the rear grounding pin. After the shielding metal parts are assembled with the insulating base in a snap-fit manner, the upper abutment arm contacts the top wall of the insulating base, and the tail ends of each mechanical terminal are elastically contacted by the punched inner bending finger; the front grounding pin and the rear grounding pin both penetrate the insulating base, and both are soldered to the PCB board and grounded.
3. The ribbon cable signal transmission assembly according to claim 2, characterized in that, The front and rear sidewalls of the front grounding foot extend outward to form a first left anti-detachment protrusion and a first right anti-detachment protrusion, respectively; the front and rear sidewalls of the rear grounding foot extend outward to form a second left anti-detachment protrusion and a second right anti-detachment protrusion, respectively. After the shielding metal component is assembled with the insulating rubber seat in a snap-fit manner, a local area of the insulating rubber seat undergoes adaptive yielding deformation, and the first left anti-detachment protrusion, the first right anti-detachment protrusion, the second left anti-detachment protrusion, and the second right anti-detachment protrusion sink into it.
4. The ribbon cable signal transmission assembly according to claim 2, characterized in that, A front material removal groove is formed on the insulating rubber base at a set distance from the front insertion slot; a rear material removal groove is formed on the insulating rubber base at a set distance from the rear insertion slot.
5. The ribbon cable signal transmission assembly according to any one of claims 1-4, characterized in that, The FFC cable includes a transmission unit, a short-state shield, and a long-state shield. Both the short-state and long-state shields are grounded, working together to form an electromagnetic wave isolation barrier around the transmission unit and creating a wired port area to partially expose the transmission unit. The transmission unit consists of parallel power transmission wires and signal transmission wires. Multiple signal transmission wires are centrally located, while the power transmission wires are positioned on either side. After the FFC cable is assembled with the FPC connector, each power transmission wire is simultaneously pressed against at least two terminals.
6. The ribbon cable signal transmission assembly according to claim 5, characterized in that, The width of the power transmission line is W1, and the width of the signal transmission line is W2. Then W1 ≥ 2.5W2, and 0.5mm ≤ W1 ≤ 0.85mm.