High-frequency flexible flat cable (FFC) and flat cable plug-in mounting structure
By setting residual posts to remove gaps in the cable port area of the FFC cable and adopting a modular design in the electrical connector, the problem of poor signal transmission in the FFC cable was solved, achieving high-quality signal transmission and stable electrical performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-03
AI Technical Summary
After the FFC cable is inserted into the electrical connector, the short post-like structure remaining at the end of the signal terminal causes problems such as radiation effect, signal reflection, attenuation, distortion, delay and mode coupling during signal transmission. In addition, poor contact and increased resistance affect the signal transmission quality.
Design a high-frequency FFC cable, including a conductor layer, a long-state insulation layer, a short-state insulation layer, and a non-metallic reinforcing plate. Remove gaps by setting residual posts in the online port area, and use modularly designed terminal blocks and pressure contact sets in the electrical connector to ensure stable electrical conduction between the signal conductor and the terminal.
It effectively eliminates residual pile effect, reduces resistance and inductance in signal transmission, improves signal quality, and ensures stable and reliable electrical and mechanical performance, making it suitable for high-frequency circuits and high-speed data transmission.
Smart Images
Figure CN224082209U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flexible flat cable manufacturing technology, and in particular to a high-frequency FFC flat cable and a flat cable insertion structure. Background Technology
[0002] FFC cables, also known as Flexible Flat Cables, allow for flexible selection of the number and spacing of wires, making wiring more convenient and significantly reducing the size of electronic products. FFC cables are suitable for data transmission between moving parts and motherboards, between PCBs, and in miniaturized electrical devices, and are widely used in mobile phones, tablets, cameras, medical equipment, and automotive electronics.
[0003] Currently, in the industry, FFC (Flexible Cable Concrete) cables are used to insert into electrical connectors, with their conductor and insulation layers flush at the end. However, after the FFC cable is inserted and electrically connected to the connector, short, stake-like structures remain at the signal terminal ends, resulting in cable stub formation. This leads to radiation effects during signal transmission, causing signal reflection, attenuation, distortion, delay, and mode coupling, among other signal transmission problems. Furthermore, poor contact and increased resistance in the signal conductors of the FFC cable also negatively impact signal transmission quality. Therefore, it is imperative for those skilled in the art to address these issues. Utility Model Content
[0004] 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 high-frequency FFC cable.
[0005] To address the aforementioned technical problems, this utility model relates to a high-frequency FFC cable, comprising a conductor layer, a long-state insulation layer, a short-state insulation layer, and non-metallic reinforcing plates. The conductor layer consists of multiple parallel signal conductors and power conductors. The long-state and short-state insulation layers work together to enclose the conductor layer, forming a wire opening area to partially expose the signal and power conductors. Two non-metallic reinforcing plates are attached and bonded to the long-state, short-state, and conductor layers. Multiple signal conductors are arranged in a concentrated manner, while the power conductors are positioned on either side. The long-state insulation layer, non-metallic reinforcing plates, and signal conductors are all retracted to form a notch for removing residual posts within the wire opening area.
[0006] As a further improvement to the technical solution disclosed in this utility model, the width of the line opening area is S1, and the width of the notch after removing the residual pile is S2. Then S2 < S1, and 0.3mm ≤ S2 ≤ 1.5mm.
[0007] As a further improvement to the technical solution disclosed in this utility model, both the signal conductor and the power conductor are preferably gold-plated flat-angle copper wires, and the cutting angle A of both is controlled within 0.5°.
[0008] As a further improvement to the technical solution disclosed in this utility model, anti-detachment notches are respectively provided on both sides of the high-frequency FFC cable. The anti-detachment notches are located on the outside of the power conductor and pass through the long-state insulation layer, the non-metallic reinforcing plate and the short-state insulation layer in sequence.
[0009] Furthermore, the present invention also discloses a ribbon cable insertion structure, which includes an electrical connector and the aforementioned high-frequency FFC ribbon cable.
[0010] As a further improvement to the technical solution disclosed in this utility model, the electrical connector includes an insulating base, a flip-up component, a set of pressure contacts, and a set of terminals. The insulating base has a recessed insertion groove for inserting a high-frequency FFC cable, extending from front to back. The terminal set consists of multiple signal terminals and power terminals of the high-frequency FFC cable, linearly arranged within the insulating base and along its width, for electrically conducting the high-frequency FFC cable. The pressure contact set consists of multiple pressure contacts linearly arranged within the insulating base and along its width, for applying an elastic constraint force to the flip-up component. The flip-up component is hinged to the insulating base. During the circumferential flipping process of the flip-up component, the high-frequency FFC cable, due to the pressure force from the flip-up component, moves towards the terminal set, allowing the signal conductors and power conductors to electrically conduct with the signal terminals and power terminals respectively.
[0011] As a further improvement to the technical solution disclosed in this utility model, the distance d between the contact of the signal terminal and the notch for removing the residual stake is 0.25mm.
[0012] Regarding high-frequency FFC cables, the beneficial technical effects that can be achieved through innovative design are mainly reflected in the following two aspects, specifically:
[0013] 1) Multiple signal conductors are arranged in a concentrated manner, while power conductors are arranged on both sides of them. This arrangement can effectively reduce electromagnetic interference between signal conductors and weaken the adverse effects of the magnetic field generated during the transmission of current by the power conductor on the transmission of electrical signals. This is beneficial to improving the transmission quality of high-frequency signals, reducing signal attenuation, distortion and delay, and ensuring that signals are transmitted stably and with high quality.
[0014] 2) Thanks to the opening of the residual stake removal gap, the residual stakes at the end of the FFC high-frequency cable can be eliminated. This not only effectively avoids problems such as poor contact and excessive resistance caused by the residual stake effect, ensuring that the FFC high-frequency cable has excellent electrical and mechanical performance, but also solves problems such as poor signal transmission such as signal reflection, attenuation, distortion, delay and mode coupling, thus ensuring the signal transmission quality.
[0015] Regarding the cable connector structure, the beneficial technical effects that can be achieved through innovative design are mainly reflected in the following three aspects, specifically:
[0016] 1) The signal terminal contacts are as close as possible to the end of the FFC high-frequency cable, the residual stake effect of the cable is weakened and eliminated, thereby reducing the resistance and inductance in the signal transmission process, thus reducing signal attenuation and delay, and significantly improving the speed and quality of signal transmission. It is especially suitable for high-frequency circuits and high-speed data transmission scenarios with extremely high requirements for signal transmission speed and accuracy.
[0017] 2) Multiple pressure contacts work together to apply an elastic constraint force to the flipping component, which can not only effectively improve the pressure stability of the flipping component on the ribbon cable, ensuring that the FFC high-frequency ribbon cable can stably and reliably achieve electrical conduction with the terminal block, but also prevent the FFC high-frequency ribbon cable from being damaged by the rigid pressure force from the flipping component even when the electrical connector is subjected to a certain degree of impact or vibration.
[0018] 3) Both the terminal block assembly and the crimping contact assembly adopt a modular design, giving the electrical connector extremely high flexibility and versatility. In practical applications, the number and layout of signal terminals, power terminals, and crimping contacts can be flexibly adjusted according to the specifications and functional requirements of different high-frequency FFC cables. Attached Figure Description
[0019] 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.
[0020] Figure 1 This is a three-dimensional schematic diagram of the ribbon cable insertion structure disclosed in this utility model.
[0021] Figure 2 This is a three-dimensional schematic diagram of the electrical connector in the cable insertion structure disclosed in this utility model.
[0022] Figure 3 yes Figure 2The front view.
[0023] Figure 4 yes Figure 3 AA sectional view.
[0024] Figure 5 yes Figure 3 BB cross-sectional view.
[0025] Figure 6 This is a three-dimensional schematic diagram of the insulating rubber base in the cable insertion structure disclosed in this utility model.
[0026] Figure 7 This is a three-dimensional schematic diagram of the flip-up component in the cable insertion structure disclosed in this utility model.
[0027] Figure 8 This is a three-dimensional schematic diagram of the high-frequency FFC cable disclosed in this utility model from one perspective.
[0028] Figure 9 This is a three-dimensional schematic diagram of the high-frequency FFC cable disclosed in this utility model from another perspective.
[0029] Figure 10 yes Figure 8 A magnified view of part of I.
[0030] Figure 11 yes Figure 9 A magnified view of part II.
[0031] Figure 12 yes Figure 1 The front view.
[0032] Figure 13 yes Figure 12 CC section view.
[0033] Figure 14 yes Figure 12 DD sectional view.
[0034] Figure 15 yes Figure 12 EE sectional view.
[0035] Figure 16 yes Figure 15 A magnified view of part III.
[0036] Figure 17 This is a comparison chart of the insertion loss performance of electrical connectors.
[0037] Figure 18 This is a comparison chart of return loss performance tests for electrical connectors.
[0038] 1-Electrical connector; 11-Insulating base; 111-Insertion recess; 12-Flipping component; 121-Left anti-detachment limiting arm; 122-Right anti-detachment limiting arm; 13-Pressing contact assembly; 131-Pressing contact; 14-Terminal assembly; 141-Signal terminal; 142-Power terminal; 2-High-frequency FFC cable; 21-Conductor layer; 211-Signal conductor; 212-Power conductor; 22-Long-state insulation layer; 23-Short-state insulation layer; 24-Non-metallic reinforcing plate; 25-Residual post removal notch; 26-Left anti-detachment notch; 27-Right anti-detachment notch. Detailed Implementation
[0039] 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.
[0040] The contents disclosed in this utility model will be further described in detail below with reference to specific embodiments. Figures 8-11 The diagram shows the structure of the high-frequency FFC cable disclosed in this utility model. It can be seen that the high-frequency FFC cable 2 mainly consists of a conductor layer 21, a long-state insulation layer 22, a short-state insulation layer 23, and a non-metallic reinforcing plate 24. The conductor layer 21 consists of multiple parallel signal conductors 211 and power conductors 212. The long-state insulation layer 22 and the short-state insulation layer 23 work together to wrap the signal conductors 211 and power conductors 212, forming a wired area to partially expose the signal conductors 211 and power conductors 212. The only difference between the long-state insulation layer 22 and the short-state insulation layer 23 is their design length. Both possess excellent electrical insulation performance, mechanical protection performance, and interference shielding performance. The material can be preferably selected from PVC, PI, TPE, or PET, usually determined based on factors such as the application scenario, voltage level, and wire specifications of the high-frequency FFC cable 2. Two non-metallic reinforcing plates 24 are used to enhance the strength, rigidity, and stability of the area near the end of the high-frequency FFC cable 2. These plates are attached and bonded to the long-state insulation layer 22, the short-state insulation layer 23, and the conductor layer 21. Multiple signal conductors 211 are arranged in a concentrated manner, while power conductors 212 are positioned on either side of them. The long-state insulation layer 22, the non-metallic reinforcing plates 24, and the signal conductors 211 are all retracted to form a residual post removal notch 25 within the cable opening area.
[0041] Thanks to the presence of the residual stake removal notch 25, the residual stake at the end of the FFC high-frequency cable 2 is eliminated. This effectively avoids problems such as poor contact and excessive resistance caused by the residual stake effect, ensuring that the FFC high-frequency cable 2 has excellent electrical and mechanical performance. On the other hand, signal transmission problems such as signal reflection, attenuation, distortion, delay, and mode coupling of the high-frequency FFC cable 2 are solved, and the signal transmission quality is guaranteed.
[0042] Furthermore, it should be noted that multiple signal conductors 211 are arranged in a concentrated manner, while power conductors 212 are arranged on both sides of them. This arrangement can effectively reduce electromagnetic interference between signal conductors 211 and weaken the adverse effects of the magnetic field generated during the transmission of current by the power conductor 212 on the transmission of electrical signals. This is beneficial to improving the transmission quality of high-frequency signals, reducing signal attenuation, distortion and delay, and ensuring that signals are transmitted stably and with high quality.
[0043] Experimental results show that variations in the width of the notch 25 (residual stake removal notch 25) alter the effective conductive area and line distribution of the high-frequency FFC cable 2, thus affecting the characteristic impedance of signal transmission. If the width of the notch 25 is too wide, signal attenuation increases during transmission, affecting signal integrity and quality, especially for high-frequency signals. Furthermore, an excessively wide notch 25 may make the high-frequency FFC cable 2 more susceptible to damage during installation and use, affecting its mechanical properties. Therefore, as a further optimization of the above technical solution, such as... Figure 9 As shown in the figure, the width of the line opening area is set as S1, and the width of the gap 25 after removing the residual pile is S2. Then S2 < S1, and 0.3mm ≤ S2 ≤ 1.5mm.
[0044] According to common knowledge, gold-plated copper wire is relatively soft, which makes it easy to process and shape the high-frequency FFC cable 2, such as through processes like pressing and bending. This allows it to better adapt to different application scenarios and installation requirements. Therefore, in this embodiment, both the signal conductor 211 and the power conductor 212 are preferably gold-plated flat-angle copper wire.
[0045] Furthermore, as a further optimization of the above technical solution, the plug-in terminals of the high-frequency FFC cable 2 need to be beveled. Assuming the bevel angle of the cut between the signal conductor 211 and the power conductor 212 is A, then A ≤ 0.5°. This helps maintain the stability of the characteristic impedance of the signal transmission; on the other hand, it minimizes impedance changes encountered by the signal during transmission, reducing signal reflection and thus improving the quality and efficiency of signal transmission, especially in high-speed signal transmission scenarios.
[0046] In addition, this utility model also discloses a ribbon cable plug-in structure, such as Figure 1As shown, it mainly consists of an electrical connector 1 and a high-frequency FFC cable 2. The high-frequency FFC cable 2 is used to transmit high-frequency signals, while the electrical connector 1 provides a reliable connection interface, enabling high-frequency data signals to be transmitted efficiently between the motherboard and components such as the RF module.
[0047] like Figures 2-5 As shown, the electrical connector 1 mainly consists of several parts, including an insulating base 11, a flip-up component 12, a pressure contact assembly 13, and a terminal assembly 14. The insulating base 11 is injection molded from thermoplastic or thermosetting resin, and has a recessed groove formed on it for inserting a high-frequency FFC cable, extending from front to back (e.g., ...). Figure 6 (As shown in the diagram). The terminal block assembly 14 consists of multiple signal terminals 141 and power terminals 142 inserted into the insulating base 11 and arranged linearly along the width of the insulating base 11, used for electrically conducting the high-frequency FFC cable 2. The contact assembly 13 consists of multiple contact members 131 inserted into the insulating base 11 and arranged linearly along the width of the insulating base 11, used for applying an elastic constraint force to the flipping member 12. The flipping member 12 is hinged to the insulating base 11. During the circumferential flipping process of the flipping member 12, the high-frequency FFC cable 2 is displaced towards the terminal block assembly 14 due to the pressure force from the flipping member 12, and the signal conductor 211 and power conductor 212 are electrically connected to the signal terminal 141 and power terminal 142 respectively (e.g., Figures 12-14 (As shown in the image). And as... Figure 13 As shown, the distance d between the contact of signal terminal 141 and the residual post removal notch 25 is 0.25mm.
[0048] Thanks to the notch 25 formed on the high-frequency FFC cable 2 to remove residual posts, the signal terminal 141 contact can be as close as possible to the end of the FFC high-frequency cable 2 when the high-frequency FFC cable 2 is fully inserted relative to the electrical connector 1. Just as... Figure 17 , 18 As shown, the residual stake effect of the ribbon cable is weakened or eliminated, thereby reducing the resistance and inductance during signal transmission, thus reducing signal attenuation and delay, and significantly improving the speed and quality of signal transmission. It is especially suitable for high-frequency circuits and high-speed data transmission scenarios with extremely high requirements for signal transmission speed and accuracy.
[0049] Furthermore, the multiple pressing contacts 131 work together to apply an elastic constraint force to the flipping member 12, which can not only effectively improve the pressing stability of the flipping member 12 on the high-frequency FFC cable 2, ensuring that the FFC high-frequency cable 2 can stably and reliably achieve electrical conduction with the terminal block assembly 14, but also prevent the FFC high-frequency cable 2 from being damaged by the rigid pressing force from the flipping member 12 even when the electrical connector 1 is subjected to a certain degree of impact or vibration.
[0050] It should also be noted that in the above technical solution, both the terminal block assembly 14 and the contact assembly 13 adopt a modular design, giving the electrical connector 1 extremely high flexibility and versatility. In practical applications, the quantity and layout of the signal terminals 141, power terminals 142, and contact 131 can be flexibly adjusted according to the specifications and functional requirements of different high-frequency FFC cables 2.
[0051] For high-frequency FFC cables that transmit high-frequency signals or high-speed data, such as hard drive data cables and display data cables in computers, pulling them off may disrupt the integrity of signal transmission, causing signal distortion, delays, and bit errors, affecting the normal operation of the equipment. For example, it may cause screen flickering or image distortion. Therefore, as a further optimization of the above technical solution, such as... Figures 8-11 As shown, the high-frequency FFC cable 2 has a left-side anti-detachment notch 26 and a right-side anti-detachment notch 27 positioned opposite each other on both sides. Both the left-side anti-detachment notch 26 and the right-side anti-detachment notch 27 are located outside the power conductor 212 and sequentially penetrate the long-state insulation layer 22, the non-metallic reinforcing plate 24, and the short-state insulation layer 23. Figure 7 As shown, the flip-up component 12 has a left anti-detachment limiting arm 121 and a right anti-detachment limiting arm 122 formed on it. When the high-frequency FFC cable 2 is inserted into the electrical connector 1 and is stably pressed against by the flip-up component 12, the left anti-detachment limiting arm 121 and the right anti-detachment limiting arm 122 pass through the left anti-detachment notch 26 and the right anti-detachment notch 27 respectively (e.g., Figure 15 , 16 As shown in the figure, the axial displacement degree of freedom of the high-frequency FFC cable 2 is restricted, which effectively avoids the phenomenon that the high-frequency FFC cable 2 will come out of the electrical connector 1 due to the dragging force.
[0052] 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 high-frequency FFC cable, comprising a conductor layer, a long-state insulation layer, a short-state insulation layer, and non-metallic reinforcing plates; the conductor layer is composed of multiple parallel signal conductors and power conductors; the long-state insulation layer and the short-state insulation layer cooperate to wrap the conductor layer and form a wire port area to partially expose the signal conductors and the power conductors; the number of non-metallic reinforcing plates is 2, and they are attached and bonded to the long-state insulation layer, the short-state insulation layer, and the conductor layer, characterized in that: Multiple signal conductors are arranged in a concentrated manner, while the power conductors are arranged in the regions on both sides thereof; the elongated insulating layer, the non-metallic reinforcing plate, and the signal conductors are all retracted in length to form a residual post removal gap in the line opening area.
2. The high-frequency FFC cable according to claim 1, characterized in that, The width of the line opening area is S1, and the width of the notch after removing the residual pile is S2. Then S2 < S1, and 0.3mm ≤ S2 ≤ 1.5mm.
3. The high-frequency FFC cable according to claim 1, characterized in that, Both the signal conductor and the power conductor are gold-plated flat-angle copper wires, and the cutting angle A of both is controlled within 0.5°.
4. The high-frequency FFC cable according to claim 1, characterized in that, The high-frequency FFC cable has anti-detachment notches on both sides; the anti-detachment notches are located on the outside of the power conductor and pass through the long-state insulation layer, the non-metallic reinforcing plate and the short-state insulation layer in sequence.
5. The ribbon cable insertion structure according to claim 1, characterized in that, It includes electrical connectors and high-frequency FFC cables as described in any one of claims 1-4.
6. The ribbon cable insertion structure according to claim 5, characterized in that, The electrical connector includes an insulating base, a flip-up component, a set of pressure contacts, and a set of terminals. The insulating base has a recessed insertion groove formed within it for inserting the high-frequency FFC cable, extending from front to back. The set of terminals consists of multiple signal terminals and power terminals of the high-frequency FFC cable, linearly arranged within the insulating base and along its width, for electrically conducting the high-frequency FFC cable. The set of pressure contacts consists of multiple pressure contacts linearly arranged within the insulating base and along its width, for applying an elastic constraint force to the flip-up component. The flip-up component is hinged to the insulating base. During the circumferential flipping process of the flip-up component, the high-frequency FFC cable undergoes displacement towards the set of terminals due to the pressure force from the flip-up component, allowing the signal conductor and power conductor to electrically conduct with the signal terminal and power terminal respectively.
7. The ribbon cable insertion structure according to claim 6, characterized in that, If the distance d between the contact of the signal terminal and the notch for removing the residual stake is less than 0.25 mm.