Flat cable signal transmission assembly

Abstract

The invention relates to the technical field of electric connector manufacturing, in particular to a flat cable signal transmission assembly which is formed by combining an FPC electric connector and an FFC flat cable. In terms of the FPC electric connector, the plurality of mechanical terminals cooperate to elastically apply pressure and limit and turn over the pressure applying piece. And when the FFC is inserted in place relative to the flat cable inserting groove and the turnover pressing piece is locked, the FFC is elastically pressed and contacted by the plurality of wiring terminals cooperatively. The front lock catch piece and the rear lock catch piece cooperate to lock the overturning pressure piece. The shielding metal piece is grounded, and after the shielding metal piece is assembled, all the mechanical terminals abut against the shielding metal piece to be electrically conducted. Therefore, on one hand, the electromagnetic shielding performance of the FPC electric connector is effectively improved; and on the other hand, the step of welding the mechanical terminal and the PCB is omitted, and the degree of freedom of translational motion of the mechanical terminal is limited by the shielding metal piece, so that the electrical connection between the mechanical terminal and the shielding metal piece is ensured to be more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic component manufacturing, and particularly to a flexible cable signal transmission assembly. Background Art

[0002] In modern electronic devices, with the continuous enrichment of product functions and the development trend of miniaturization and light weight, higher requirements are put forward for the performance and structural design of internal connection components. As a key component for realizing the internal circuit connection of electronic devices, the performance of the flexible cable signal transmission assembly directly affects the stability and reliability of the entire device.

[0003] The flexible cable signal transmission assembly is composed of an FPC electrical connector and an FFC flexible cable. 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 is easily coupled into the electrical connector, thereby interfering with signal transmission, resulting in problems such as signal distortion and increased bit error rate, seriously affecting the normal operation of the electronic device.

[0004] Regarding the current industry situation, the FPC electrical connector mainly consists of an insulating rubber seat, a wiring terminal, a mechanical terminal, a flipping pressing member, and a shielding metal member, etc. After the FFC flexible cable is inserted into place relative to the insulating rubber seat, it is locked by means of the flipping pressing member, and the FFC flexible cable is elastically pressed and electrically conducted by multiple wiring terminals in cooperation. The flipping pressing member is elastically pressed and limited by multiple linear array mechanical terminals in cooperation. The shielding metal member is buckled on the insulating rubber seat and grounded to form a first electromagnetic shielding layer. Multiple linearly arrayed mechanical terminals are welded to the PCB board and are each independently grounded to form a second electromagnetic shielding layer. And the PCB board needs to be pre-laid out with multiple grounding soldering points to realize the grounding design of the mechanical terminals. Moreover, in actual production, the layout space of the PCB board is often limited. The layout of too many soldering points will greatly increase the complexity of the circuit frame design and manufacturing of the PCB board, thereby resulting in a high production cost. In addition, the soldering difficulty is extremely high and the workload is large. And it is difficult to ensure the consistency of the welding quality between the mechanical terminal and the PCB board. Problems such as virtual soldering and desoldering often occur in actual soldering operations, resulting in the mechanical terminal being unable to be effectively grounded, and the function of the second electromagnetic shielding layer cannot be normally realized, and it cannot effectively block the influence of external electromagnetic interference on the internal circuit, which may cause serious problems in electronic devices with high requirements for electromagnetic compatibility, affecting the performance and stability of the device. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the Invention

[0005] Therefore, in view of the above existing problems and defects, the R & D and design team of the present invention collected relevant materials, conducted multi-party evaluations and considerations, and through continuous experiments and modifications by the R & D and design team members, finally led to the emergence of the flexible cable signal transmission assembly.

[0006] To solve the above technical problems, the present invention relates to a flexible cable signal transmission assembly, which is composed of an FPC electrical connector and an FFC flexible cable. The FPC electrical connector includes an insulating rubber seat, a wiring terminal, a mechanical terminal, a flipping pressure member, a front locking member, a rear locking member, and a shielding metal member. A flexible cable insertion groove, a wiring terminal embedding groove, and a mechanical terminal embedding groove are simultaneously formed on the insulating rubber seat. A plurality of mechanical terminals cooperate to elastically apply pressure and limit the flipping pressure member. When the FFC flexible cable is inserted into place relative to the flexible cable insertion groove and the flipping pressure member is locked, the FFC flexible cable is elastically pressed and electrically conducted by a plurality of wiring terminals in cooperation. The front locking member and the rear locking member are both based on the insulating rubber seat for embedding, and the two cooperate to lock the flipping pressure member. The shielding metal member is grounded, and after it is assembled to the insulating rubber seat in a snap-fit manner, each mechanical terminal is in contact with the shielding metal member and electrically conducted.

[0007] As a further improvement of the technical solution of the present invention, the shielding metal member is a sheet metal part, which is connected by a vertical bending arm, an upper abutting arm, a front grounding foot, and a rear grounding foot. The vertical bending arm, the front grounding foot, and the rear grounding foot all extend from the upper abutting arm and are bent at 90°. Along its length direction, a series of punching inner bending fingers are formed on the vertical bending arm. A front insertion groove for inserting the front grounding foot and a rear insertion groove for inserting the rear grounding foot are simultaneously formed on the insulating rubber seat. After the shielding metal member is assembled to the insulating rubber seat in a snap-fit manner, the upper abutting arm is in contact with the top wall of the insulating rubber seat, and the tails of each mechanical terminal are elastically contacted by the punching inner bending fingers one by one. The front grounding foot and the rear grounding foot both penetrate the insulating rubber seat, and both are soldered and fixed to the PCB board and grounded.

[0008] As a further improvement of the technical solution of the present invention, a first left anti-disengagement protrusion and a first right anti-disengagement protrusion are respectively extended outward from the front and rear side walls of the front grounding foot. A second left anti-disengagement protrusion and a second right anti-disengagement protrusion are respectively extended outward from the front and rear side walls of the rear grounding foot. After the shielding metal member is assembled to the insulating rubber seat in a snap-fit manner, the local area of the insulating rubber seat undergoes self-adaptive yielding deformation, and the first left anti-disengagement protrusion, the first right anti-disengagement protrusion, the second left anti-disengagement protrusion, and the second right anti-disengagement protrusion sink therein.

[0009] As a further improvement of the technical solution of the present invention, a front material-removing groove is formed on the insulating rubber seat at a set distance from the front insertion groove. A rear material-removing groove is formed on the insulating rubber seat at a set distance from the rear insertion groove.

[0010] As a further improvement of the technical solution of the present invention, the FFC flexible cable includes a conduction and transmission unit, a short-state shielding body, and a long-state shielding body. Both the short-state shielding body and the long-state shielding body are grounded, and cooperate with each other to form an electromagnetic wave isolation barrier around the conduction and transmission unit, and form a wire port area to partially expose the conduction and transmission unit. The conduction and transmission unit is composed of power transmission wires and signal transmission wires arranged in parallel. A plurality of signal transmission wires are arranged in the middle, and the power transmission wires are arranged in the areas on both sides thereof. And after the FFC flexible cable is inserted and combined with the FPC electrical connector, a single power transmission wire is simultaneously pressed by at least two terminal blocks.

[0011] As a further improvement of the technical solution of the present invention, if the width value of the power transmission wire is W1 and the width value of the signal transmission wire is W2, then W1≥2.5W2, and 0.5mm≤W1≤0.85mm.

[0012] In practical applications, the flexible cable signal transmission assembly disclosed by the present invention can at least achieve the following beneficial technical effects:

[0013] 1) After the shielding metal part is grounded and electrically connected to each mechanical terminal in a mutually abutting manner 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 electrical signals transmitted internally from generating electromagnetic radiation to the outside world, thereby improving the quality and stability of signal transmission and reducing the impact of electromagnetic interference on surrounding electronic devices;

[0014] 2) Each mechanical terminal is assembled in the insulating rubber seat by an inlay method, eliminating the step of soldering to the PCB board, and its translational movement freedom is limited by the shielding metal part. In this way, on the one hand, the soldering process in the production process of the FPC electrical connector is reduced, and the complexity and difficulty of production operations are reduced; on the other hand, due to the setting of the shielding metal part, the position accuracy of the mechanical terminal during operation can be effectively guaranteed, and the electrical connection between the mechanical terminal and the shielding metal part can be ensured to be more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a three-dimensional schematic diagram of the flexible cable signal transmission assembly disclosed in the present invention.

[0017] Figure 2 It is a three-dimensional schematic diagram of the FPC electrical connector in the flexible cable signal transmission assembly disclosed in the present invention.

[0018] Figure 3 It is Figure 2 the top view of

[0019] Figure 4 It is a three-dimensional schematic diagram of the insulating rubber seat in the flexible cable signal transmission assembly disclosed in the present invention.

[0020] Figure 5 It is a three-dimensional schematic diagram of the mechanical terminal in the flexible cable signal transmission assembly disclosed in the present invention.

[0021] Figure 6 It is a three-dimensional schematic diagram of one perspective of the shielding metal part in the flexible cable signal transmission assembly disclosed in the present invention.

[0022] Figure 7 It is a three-dimensional schematic diagram of another perspective of the shielding metal part in the flexible cable signal transmission assembly disclosed in the present invention.

[0023] Figure 8 It is Figure 6 the enlarged view of part I of

[0024] Figure 9 It is Figure 3 the sectional view taken along line A-A of

[0025] Figure 10 It is Figure 3 the sectional view taken along line B-B of

[0026] Figure 11 It is Figure 3 the sectional view taken along line C-C of

[0027] Figure 12 It is a three-dimensional schematic diagram of the FFC flexible cable in the flexible cable signal transmission assembly disclosed in the present invention.

[0028] Figure 13 It is Figure 12 the enlarged view of part II of

[0029] Figure 14 It is a schematic diagram of the state of each wiring terminal in the flexible cable signal transmission assembly disclosed in the present invention after being pressed against the conduction transmission unit.

[0030] Figure 15 It is Figure 14 the enlarged view of part III of

[0031] 1 - FPC electrical connector; 11 - insulating rubber base; 111 - flexible cable insertion slot; 112 - terminal insertion slot; 113 - mechanical terminal insertion slot; 114 - front insertion slot; 115 - rear insertion slot; 116 - front material removal slot; 117 - rear material removal slot; 12 - terminal; 13 - mechanical terminal; 14 - flipping pressure member; 15 - front locking member; 16 - rear locking member; 17 - shielding metal part; 171 - vertical bending arm; 1711 - blanking inner bending finger; 172 - upper abutting arm; 173 - front grounding pin; 1731 - first left anti - detachment protrusion; 1732 - first right anti - detachment protrusion; 174 - rear grounding pin; 1741 - second left anti - detachment protrusion; 1742 - second right anti - detachment protrusion; 2 - FFC flexible cable; 21 - conduction and transmission unit; 211 - power transmission wire; 212 - signal transmission wire; 22 - short - state shielding body; 23 - long - state shielding body. Detailed implementation manners

[0032] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "left", "right", "upper", "lower", "front", "rear", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0033] The following will further elaborate on the content disclosed in the present invention in conjunction with specific embodiments. Figure 1 The three - dimensional schematic diagram of the flexible cable signal transmission assembly disclosed in the present invention is shown. It can be seen that it is composed of an FPC electrical connector 1 and an FFC flexible cable 2. The FPC electrical connector 1 and the FFC flexible cable 2 cooperate with each other, enabling current to flow smoothly between different circuit parts, ensuring the electrical signal transmission between various components of the electronic device, and thus supporting the normal operation of the device.

[0034] As Figure 2 , Figure 3 , Figure 9 shown, the FPC electrical connector 1 mainly consists of several parts such as an insulating rubber base 11, a terminal 12, a mechanical terminal 13, a flipping pressure member 14, a front locking member 15, a rear locking member 16, and a shielding metal part 17. Among them, a flexible cable insertion slot 111, a terminal insertion slot 112, and a mechanical terminal insertion slot 113 are simultaneously formed on the insulating rubber base 11 (as Figure 4 shown). A plurality of mechanical terminals 13 are arranged in a linear array and cooperate to elastically apply pressure and limit the flipping pressure member 14. When the FFC flexible cable 2 is inserted into the flexible cable insertion slot 111 in place and the flipping pressure member 14 is locked, the FFC flexible cable 2 is elastically pressed and electrically conducted by a plurality of terminals 12 (asFigure 14 , Figure 15 As shown in Figure 15 . The front locking fastener 15 and the rear locking fastener 16 are both based on the insulating rubber seat 11 for embedding, and the two cooperate to lock the flipping pressing member 14. The shielding metal part 17 is grounded, and after it is assembled to the insulating rubber seat 11 in a snap-fit manner, each mechanical terminal 13 is in top contact with the shielding metal part 17 and is electrically conductive.

[0035] As Figures 6 - 8 shown in Figures 6 - 8 , the shielding metal part 17 is a sheet metal part, which is formed by connecting a vertical bending arm 171, an upper abutting arm 172, a front grounding leg 173 and a rear grounding leg 174. The vertical bending arm 171, the front grounding leg 173 and the rear grounding leg 174 all extend from the upper abutting arm 172 and are bent at 90°. Along its length direction, a series of blanking inner bending fingers 1711 are formed on the vertical bending arm 171. As Figure 4 shown in Figure 4 , a front insertion slot 114 for inserting the front grounding leg 173 and a rear insertion slot 115 for inserting the rear grounding leg 174 are simultaneously formed on the insulating rubber seat 11. After the shielding metal part 17 is assembled to the insulating rubber seat 11 in a snap-fit manner, the upper abutting arm 172 is in contact with the top wall of the insulating rubber seat 11, and the tails of each mechanical terminal 13 are elastically contacted by the blanking inner bending fingers 1711 one by one to achieve electrical conduction. The front grounding leg 173 and the rear grounding leg 174 both penetrate the insulating rubber seat 11, and both are soldered and fixed to the PCB board and grounded.

[0036] In the above technical solution, after the shielding metal part 17 is grounded, it is electrically conductive with each mechanical terminal 13 by means of mutual top contact to form a complete shielding structure. In this way, it effectively blocks external electromagnetic interference from entering the FPC electrical connector, and at the same time can also prevent the electrical signals transmitted inside 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 devices.

[0037] Furthermore, each mechanical terminal 13 is assembled in the insulating rubber seat 11 by an embedding method, omitting the step of soldering to the PCB board, and its translational movement freedom is limited by the shielding metal part 17. As Figure 5 shown in Figure 5 , the grounding soldering leg in the conventional design of the mechanical terminal 13 is removed (shown in dotted lines). In this way, on the one hand, the welding process in the production process of the FPC electrical connector 1 is reduced, and the complexity and difficulty of production operations are reduced; on the other hand, due to the setting of the shielding metal part 17, the position accuracy of the mechanical terminal 13 during operation can be effectively guaranteed, and the electrical connection between the mechanical terminal 13 and the shielding metal part 17 is more stable and reliable, thereby ensuring that each mechanical terminal 13 is properly grounded.

[0038] Here, it should be emphasized that, also due to the presence of the shielding metal part 17, the top wall of the insulating rubber seat 11 is constantly touched by it throughout its length. In this way, it effectively ensures that the top wall of the insulating rubber seat 11 always maintains good flatness during long-term application, avoiding the occurrence of the "arching" phenomenon due to uneven stress or external force, and ensuring the normal performance of the FPC electrical connector.

[0039] According to the feedback of the assembly component, during the transfer of the FPC electrical connector in the previous process before welding with the PCB board, the shielding metal part 17 is prone to loosen or fall off from the insulating rubber seat 11, which will inevitably affect the smooth progress of the subsequent welding and fixing process with the PCB board. In view of this, as a further optimization of the above technical solution, as Figure 6 、 Figure 7 shown, the front and rear side walls of the front grounding pin 173 respectively extend outward to form a first left anti-loosening protrusion 1731 and a first right anti-loosening protrusion 1732. The front and rear side walls of the rear grounding pin 174 respectively extend outward to form a second left anti-loosening protrusion 1741 and a second right anti-loosening protrusion 1742. After the shielding metal part 17 is assembled with the insulating rubber seat 11 in a snap-fit manner, the local area of the insulating rubber seat 11 undergoes self-adaptive yielding deformation, and the first left anti-loosening protrusion 1731, the first right anti-loosening protrusion 1732, the second left anti-loosening protrusion 1741, and the second right anti-loosening protrusion 1742 are all sunken therein (as Figure 10 、 Figure 11 shown). In this way, similar to the mortise and tenon structure in the mechanical field, it greatly increases the mechanical connection strength between the shielding metal part 17 and the insulating rubber seat 11. Compared with the ordinary simple snap-fit connection method, it can withstand greater external force pulling, vibration and other conditions.

[0040] Furthermore, considering the aspect of balancing the wall thickness of the insulating rubber seat and improving the injection molding quality of the insulating rubber seat 11, as a further optimization of the above technical solution, as Figure 4 shown, adjacent to the front insertion slot 114, a front material scooping slot 116 is formed on the insulating rubber seat 11. Adjacent to the rear insertion slot 115, a rear material scooping slot 117 is formed on the insulating rubber seat. In this way, during the injection molding process, it ensures that the wall thickness of the insulating rubber seat 11 is more uniform, so as to reduce the uneven shrinkage phenomenon caused by material accumulation.

[0041] Figure 12The three-dimensional schematic diagram of the FFC flexible cable disclosed in the present invention is shown. It can be seen that the FFC flexible cable 2 is mainly composed of a conduction and transmission unit 21, a short-state shielding body 22, a long-state shielding body 23 and other parts combined. Both the short-state shielding body 22 and the long-state shielding body 23 are grounded, and cooperate with each other to form an electromagnetic wave isolation barrier around the conduction and transmission unit 21, and a wire port area is formed to partially expose the conduction and transmission unit 21. The conduction and transmission unit 21 is composed of power transmission wires 211 and signal transmission wires 212 arranged in parallel. Multiple signal transmission wires 212 are arranged in the middle, and the power transmission wires 211 are arranged in the areas on both sides. In this way, the influence of external interference on the signal transmission wires 212 is effectively reduced, ensuring that data can be transmitted accurately and quickly, maintaining the integrity of the signal, and improving the quality and efficiency of data transmission.

[0042] As a further optimization of the above technical solution, the power transmission wire 211 is preferably a tinned flat copper wire and has been widened. Specifically: as Figure 13 shown, if the width value of the power transmission wire 211 is W1 and the width value of the signal transmission wire 212 is W2, then W1≥2.5W2, and 0.5mm≤W1≤0.85mm. After the FFC flexible cable 2 is completely inserted and combined with the FPC electrical connector 1, a single power transmission wire 211 is simultaneously pressed by two wiring terminals 12 (as Figure 14 , Figure 15 shown). In this way, on the one hand, the current shunting effect of the cable signal transmission assembly is optimized, greatly improving its current transmission capacity; on the other hand, the power transmission contact points of the power transmission wire 211 are doubled, thus greatly reducing the contact resistance and reducing problems such as heat generation and voltage drop caused by poor contact, and it is easy to pass the temperature rise test during the performance test stage.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flexible cable signal transmission assembly is composed of an FPC electrical connector and an FFC flexible cable; characterized in that, The FPC electrical connector includes an insulating rubber seat, a wiring terminal, a mechanical terminal, a flipping pressing member, a front locking member, a rear locking member, and a shielding metal member; a flexible cable insertion groove, a wiring terminal embedding groove, and a mechanical terminal embedding groove are simultaneously formed on the insulating rubber seat; a plurality of the mechanical terminals cooperate to elastically press and limit the flipping pressing member; when the FFC flexible cable is inserted into place relative to the flexible cable insertion groove and the flipping pressing member is locked, the FFC flexible cable is elastically pressed and electrically contacted by a plurality of the wiring terminals; the front locking member and the rear locking member are both based on the insulating rubber seat for embedding, and the two cooperate to lock the flipping pressing member; the shielding metal member is grounded, and after it is assembled to the insulating rubber seat in a snap-fit manner, each of the mechanical terminals is in abutting contact with the shielding metal member and is electrically conductive.

2. The flexible printed circuit signal transmission assembly according to claim 1, wherein, The shielding metal member is a sheet metal part, which is connected by a vertical bending arm, an upper abutting arm, a front grounding leg, and a rear grounding leg; the vertical bending arm, the front grounding leg, and the rear grounding leg all extend from the upper abutting arm and are bent at 90°; along its length direction, a series of blanking inner bending fingers are formed on the vertical bending arm; a front insertion groove for inserting the front grounding leg and a rear insertion groove for inserting the rear grounding leg are simultaneously formed on the insulating rubber seat; After the shielding metal member is assembled to the insulating rubber seat in a snap-fit manner, the upper abutting arm is in contact with the top wall of the insulating rubber seat, and the tail ends of each of the mechanical terminals are elastically abutted by the blanking inner bending fingers one by one; the front grounding leg and the rear grounding leg both penetrate the insulating rubber seat, and both are soldered and fixed to the PCB board and are grounded.

3. The flexible printed circuit signal transmission assembly according to claim 2, wherein A first left anti-disengagement protrusion and a first right anti-disengagement protrusion are respectively extended outward from the front and rear side walls of the front grounding leg; a second left anti-disengagement protrusion and a second right anti-disengagement protrusion are respectively extended outward from the front and rear side walls of the rear grounding leg; After the shielding metal member is assembled to the insulating rubber seat in a snap-fit manner, a local area of the insulating rubber seat undergoes self-adaptive yielding deformation, and the first left anti-disengagement protrusion, the first right anti-disengagement protrusion, the second left anti-disengagement protrusion, and the second right anti-disengagement protrusion sink therein.

4. The flexible cable signal transmission assembly according to claim 2, wherein At a set distance from the front insertion groove, a front material scooping groove is formed on the insulating rubber seat; at a set distance from the rear insertion groove, a rear material scooping groove is formed on the insulating rubber seat.

5. The flexible cable signal transmission assembly according to any one of claims 1-4, characterized in that, The FFC flexible cable includes a conduction and transmission unit, a short-state shielding body, and a long-state shielding body; both the short-state shielding body and the long-state shielding body are grounded, and cooperate with each other to form an electromagnetic wave isolation barrier around the conduction and transmission unit, and form a wire port area to partially expose the conduction and transmission unit; the conduction and transmission unit is composed of power transmission wires and signal transmission wires arranged in parallel; multiple signal transmission wires are arranged in the middle, and the power transmission wires are arranged in the areas on both sides thereof; and after the FFC flexible cable is inserted and combined with the FPC electrical connector, a single power transmission wire is simultaneously pressed by at least two of the wiring terminals.

6. The flexible cable signal transmission assembly according to claim 5, wherein, If the width value of the power transmission wire is W1 and the width value of the signal transmission wire is W2, then W1 ≥ 2.5W2, and 0.5 mm ≤ W1 ≤ 0.85 mm.

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