A rigid-flex printed board, a flex board assembly, and a connector

Abstract

The utility model discloses for promoting the production efficiency of low frequency cable assembly, disclose a rigid and flexible printed board, flexible board assembly and connector. The rigid and flexible printed board includes rigid area one, rigid area two of both end parts, and the flexible area between rigid area one, rigid area two, rigid area one, rigid area two are used respectively for the contact piece one of pressure connection connector device one, the contact piece two of connector device two, the flexible board assembly includes the connector device one with contact piece one, the connector device two with contact piece two, and the rigid area one, rigid area two of both ends of rigid and flexible printed board are pressure connected with one end of contact piece one, contact piece two respectively, the connector adopts the flexible board assembly. The technical scheme provided by the utility model can improve production efficiency greatly, reduce the process difficulty and cost, improve product quality consistency, optimize structure and performance, enhance the adaptation flexibility.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency connector technology, and in particular to a rigid-flex printed circuit board, a flexible board assembly, and a connector.

[0002] Background technology.

[0003] In the field of low-frequency signal transmission, low-frequency cable assemblies such as CB-02-00-8097 are widely used, and their traditional structure is as follows: Figure 1 As shown, it mainly consists of J30J connector 100, surface-mount terminal block 200, AF conductor 300, heat shrink tubing, and other components. Based on the actual needs of product installation and use, this type of cable assembly requires the AF conductor 300 to be compressed by 2mm during assembly to meet the overall assembly space and connection requirements of the equipment. However, existing low-frequency cable assemblies such as CB-02-00-8097 have the following obvious defects in production, assembly, and practical application: First, after the cable and connector contacts are crimped, potting is required. This process not only increases the complexity of production operations but also significantly extends the overall production cycle, making it difficult to meet the needs of efficient mass production. Second, to ensure that the cable can achieve a compression of 2mm during use (15mm in its natural state and 13mm in its compressed state), the conductors need to be pre-shaped. Furthermore, the cable assembly shape cannot exceed the range of the mounting holes on the J30J connector end. The conductor shaping is difficult and the process stability is poor, which is not conducive to standardized mass production and also brings many inconveniences to on-site installation. Third, the assembly process of the entire assembly requires a high level of skill from the operators and must be completed by skilled professionals, leading to increased labor costs, poor product economy, and also affecting the consistency of product quality due to differences in human operation. The aforementioned problems have limited the production efficiency and application effect of low-frequency cable assemblies such as CB-02-00-8097. Therefore, it is urgent to improve their structure and process to address the shortcomings of existing technologies.

[0004] It should be noted that the above technical information is intended only to enhance the understanding of the overall background technology of this utility model, and should not be regarded as an admission or in any form implying that the above technical information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings in the aforementioned background technology, this utility model proposes a rigid-flex printed circuit board, a flexible board assembly, and a connector. The technical problem to be solved is: how to improve the production efficiency of low-frequency cable assemblies.

[0006] The technical solution of this utility model is as follows: A rigid-flex printed circuit board (PCB) includes two rigid regions at both ends, and a flexible region between them. The rigid regions are used to press-fit contact one of a first connecting device and contact two of a second connecting device, respectively. This technical solution is a basic solution for rigid-flex PCBs, featuring rigid regions at both ends and a flexible region in the middle. The rigid regions are used to press-fit the contacts of the two connecting devices. The advantages include: solving the problem of pre-shaping required for traditional AF conductors: the flexible region in the middle is inherently flexible and can directly meet the mm compression requirements, eliminating the need for complex pre-shaping of the conductors, reducing molding difficulty, and adapting to mass production; improving assembly convenience: the stable structure of the rigid regions at both ends makes it easier to align and press-fit the conductors with the contacts of the connecting devices compared to flexible conductors, avoiding the secondary soldering problem of surface-mount connectors, and eliminating potting and shaping processes during component assembly, resulting in good economic efficiency and simplified assembly operations; optimizing structural reliability: the integrated rigid-flex structure avoids weak points in the connection between the conductors and contacts, improving signal transmission stability and component mechanical strength.

[0007] Based on the above technical solution, as a preferred technical solution for the rigid-flex printed circuit board, both rigid region one and rigid region two are provided with crimping holes for crimping contact one and contact two. This technical solution is a preferred solution for crimping holes in rigid-flex printed circuit boards, achieving precise positioning crimping: the crimping holes provide a clear assembly reference for the contact, avoiding offset during crimping and improving crimping accuracy and consistency; simplifying the crimping process: the contact can directly mate with the rigid region through the crimping holes without additional positioning tooling, shortening assembly time and reducing reliance on worker skills; enhancing connection firmness: the mechanical mating structure between the crimping holes and the contact is less prone to loosening compared to simple surface crimping, improving the component's resistance to vibration and impact.

[0008] Based on the above technical solutions, as a preferred technical solution for the rigid-flex printed circuit board, one end of both contact element one and contact element two is provided with a fisheye terminal that matches the crimping hole. This technical solution is a preferred solution where one end of the contact element is provided with a fisheye terminal that matches the crimping hole, replacing the potting process: the interference fit between the fisheye terminal and the crimping hole can achieve a reliable connection without the need for potting sealant, significantly shortening the production cycle and reducing process complexity; it enables rapid assembly: the fisheye terminal can be directly inserted into the crimping hole to complete the connection without complex crimping equipment, improving assembly efficiency and adapting to mass production; it ensures connection stability: the elastic deformation of the fisheye structure can compensate for assembly errors, while forming a tight contact, reducing contact resistance, and ensuring stable low-frequency signal transmission.

[0009] Based on the above technical solutions, as a preferred technical solution for the rigid-flexible printed circuit board, the fisheye terminal includes a tip for direct insertion into the crimp hole and a step that engages with the end face of the crimp hole. Between the tip and the step is an elliptical hole structure that deforms under pressure. This technical solution is a preferred embodiment of the fisheye terminal with a tip, step, and elliptical hole structure, improving assembly convenience: the tip guides the fisheye terminal to be quickly inserted into the crimp hole, reducing assembly alignment time and operational difficulty; achieving precise positioning: the step engages with the end face of the crimp hole, accurately positioning the insertion depth of the fisheye terminal, avoiding over-insertion or under-insertion, ensuring assembly consistency; enhancing connection reliability: after being deformed under pressure, the elliptical hole structure fits tightly against the inner wall of the crimp hole, forming multi-point contact, improving the mechanical strength and electrical contact stability of the connection, while also possessing a certain buffering capacity to adapt to vibration conditions.

[0010] Based on the above technical solutions, as a preferred technical solution for the rigid-flex printed circuit board, one end of contact one and contact two are respectively used for crimping rigid region one and rigid region two, and the other end of contact one and contact two are respectively used for surface mounting of the corresponding printed circuit board. This technical solution is a preferred solution where the other end of the contact is used for surface mounting of the corresponding printed circuit board, simplifying the connection process: after avoiding the secondary soldering problem of surface mount connectors, only one end of the surface mount connection can be completed by automated mounting equipment. Compared with traditional wire soldering or crimping, it improves assembly efficiency and reduces labor costs; improves integration: the surface mount connection between the contact and the printed circuit board reduces redundant connection structures, making the overall component more compact and adapting to the miniaturization requirements of equipment; ensures connection consistency: automated surface mounting avoids differences in human operation, reduces problems such as cold solder joints and false solder joints, and improves product quality stability.

[0011] A flexible printed circuit board (FPCB) assembly includes a first connector with a first contact element and a second connector with a second contact element. The rigid regions one and two at both ends of the rigid-flex printed circuit board described in any of the above technical solutions are respectively pressed against one end of the first contact element and one end of the second contact element. This technical solution is a fundamental technical solution for FPCB assemblies and includes the following beneficial effects: Integrated and optimized structure: Integrating the connector with the rigid-flex printed circuit board replaces the traditional dispersed structure of "connector + wire + terminal," simplifying the overall assembly structure and reducing assembly steps; Solving many defects of traditional assemblies: Inheriting the advantages of rigid-flex printed circuit boards, while achieving direct docking of the two connectors, avoiding wire transfer losses, improving signal transmission efficiency, and eliminating the need for potting and pre-correction, shortening the production cycle; Improved adaptability: The size and flexible area length of the rigid-flex printed circuit board can be flexibly adjusted according to equipment installation requirements to adapt to different assembly spaces.

[0012] Based on the above technical solutions, as a preferred technical solution for the flexible circuit board assembly, the first connecting device includes a housing and a printed circuit board, with one end of the contact being crimped to a rigid region and the other end being surface-mounted to the printed circuit board; the second connecting device includes a housing and a printed circuit board, with one end of the contact being crimped to a rigid region and the other end being surface-mounted to the printed circuit board. The flexible circuit board assembly provided by this technical solution, with its connecting devices comprising a housing and a printed circuit board, is a preferred solution where both ends of the contact are crimped and surface-mounted, offering the following advantages: Improved structural integrity: The housing provides protection for the internal printed circuit board and contact, enhancing the assembly's resistance to electromagnetic interference and mechanical protection; Efficient switching: One end of the contact is crimped to the rigid-flex printed circuit board, and the other end is surface-mounted to the printed circuit board inside the connecting device, forming an efficient signal transmission path of "rigid-flex printed circuit board - contact - connecting device printed circuit board," reducing signal attenuation; Adaptation to automated production: The combination of surface mounting and crimping processes is compatible with automated production lines, significantly improving batch production efficiency and reducing reliance on skilled workers.

[0013] Based on the above technical solutions, as a preferred technical solution for the flexible plate assembly, the flexible area is located on the same side of connecting device one and connecting device two. This technical solution is a preferred solution for the flexible plate assembly where the flexible area is located on the same side of the two connecting devices, and has the following beneficial effects: Optimized spatial layout: The flexible area is concentrated on the same side, avoiding interference with other components of the equipment, adapting to compact installation space, and improving the layout flexibility of the assembly within the equipment; Convenient maintenance: The flexible area has a fixed position, allowing for quick location of deformed parts during maintenance, reducing maintenance difficulty; Improved deformation stability: The flexible area concentrates the force, avoiding structural fatigue caused by dispersed deformation, and extending the service life of the assembly.

[0014] Based on the above technical solutions, as a preferred technical solution for the flexible circuit board assembly, an elastic element for auxiliary positioning is provided between the first connecting device and the second connecting device. This technical solution is a preferred solution for providing an auxiliary positioning elastic element between the two connecting devices in the flexible circuit board assembly, and has the following beneficial effects: Achieving precise assembly: The elastic element can assist the two connecting devices in quick alignment during assembly, reducing assembly errors and improving assembly efficiency; Compensating for assembly tolerances: The deformation capability of the elastic element can compensate for the dimensional tolerances between the connecting device and the rigid-flex printed circuit board, ensuring reliable connection; Buffering external stress: When the equipment vibrates or the temperature changes, the elastic element can absorb impact and deformation stress, preventing damage to the rigid-flex printed circuit board or contact parts due to stress concentration, and improving the reliability of the assembly.

[0015] A connector comprising the flexible board assembly described in any of the above technical solutions. It has the following beneficial effects: Improved connector performance: Inheriting all the advantages of the flexible board assembly, the connector features high production efficiency, simple assembly, and stable quality, overcoming the shortcomings of traditional low-frequency connectors that rely on wires; Enhanced compatibility: Flexible board assemblies with different structures can be selected according to different low-frequency signal transmission requirements, adapting to equipment in various fields such as communication and instrumentation; Reduced usage costs: The connector has a short production cycle and low failure rate, not only reducing manufacturing costs but also reducing subsequent maintenance costs, thus improving economic efficiency.

[0016] Compared with existing technologies, this utility model not only provides a novel rigid-flex printed circuit board (PCB), a novel flexible PCB assembly, and a novel connector. The core of this utility model lies in its hierarchical design of "rigid-flex PCB - flexible PCB assembly - connector," comprehensively addressing the pain points of traditional low-frequency cable assemblies such as CB-02-00-8097 from both structural optimization and process simplification perspectives. The overall beneficial effects are as follows: 1. Significantly improve production efficiency: Eliminate cumbersome processes such as potting and wire pre-alignment, and adopt simplified processes such as fisheye crimping and automated surface mounting, shortening the production cycle by more than 30% and making it suitable for mass production; 2. Reduced process difficulty and cost: Assembly can be completed without skilled workers, reducing labor costs by 20%-40%, while also reducing auxiliary costs such as positioning tooling and potting materials; 3. Improve product quality consistency: Standardized rigid-flexible structure, precise crimping and positioning, and automated assembly avoid differences caused by human operation, increasing the product qualification rate to over 98%; 4. Optimized structure and performance: The integrated rigid-flexible structure not only meets the 2mm compression requirement, but also improves the mechanical strength and vibration resistance of the components, and reduces signal transmission attenuation by 5%-10%; 5. Enhanced adaptability: The size of the rigid-flex printed circuit board, the position of the flexible area, and the specifications of the connecting devices can be adjusted according to the equipment space and signal transmission requirements to adapt to low-frequency signal transmission scenarios in multiple fields. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0018] Figure 1 This refers to low-frequency cable assemblies in the existing technology; Figure 2 This is the front view of the present invention; Figure 3 for Figure 2 The left view; Figure 4 for Figure 3 A partial sectional view; Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0019] Explanation of icon numbers: J30J connector 100, surface-mount terminal block 200, AF wire 300; Connecting device 1, housing 1-0, contact 1-1; Connector 2, housing 2-0, contact 2-1; 3. Rigid-flexible printed circuit board, 3-0 crimping hole, 3-1 rigid area one, 3-2 rigid area two, 3-3 flexible area; Fisheye terminal 4, tip 4-1, elliptical hole structure 4-2, step 4-3. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the core concept of the present utility model and the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0022] It should be noted that, in the description of this application, unless otherwise stated, "several" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," etc., indicating orientation or positional relationships are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0024] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0025] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0027] A flexible board assembly, such as Figure 2 and Figure 3 As shown, a rigid-flex printed circuit board includes a rigid region 3-1 and a rigid region 3-2 at both ends, with a flexible region 3-3 between the rigid regions 3-1 and 3-2. The rigid regions 3-1 and 3-2 are used to press the contact 1-1 of the connecting device 1 and the contact 2-1 of the connecting device 2, respectively.

[0028] This embodiment presents a basic solution for a rigid-flex printed circuit board (PCB), featuring rigid regions at both ends and a flexible region in the middle. The rigid regions are used to crimp the contacts of two connecting devices. The advantages include: Solving the problem of pre-shaping required for traditional AF conductors: The flexible region in the middle is inherently flexible, directly meeting the 2mm compression requirement without complex pre-shaping of the conductors, reducing molding difficulty and adapting to mass production; Improving assembly convenience: The stable structure of the rigid regions at both ends makes it easier to align and crimp the conductors with the contacts compared to flexible conductors, avoiding the secondary soldering issues of surface-mount connectors. Furthermore, it eliminates potting and shaping processes during component assembly, resulting in good economic efficiency and simplified assembly operations; Optimizing structural reliability: The integrated rigid-flexible structure avoids weak points in the connection between the conductors and contacts, improving signal transmission stability and component mechanical strength.

[0029] As a preferred implementation: Structural parameters: The overall length of the rigid-flex printed circuit board is 50mm. The rigid area 1 (3-1) and the rigid area 2 (3-2) are both 10mm×8mm×1.6mm and are made of FR-4 epoxy resin substrate (Tg≥130℃). The middle flexible area 3-3 is 30mm×8mm×0.2mm and is made of polyimide (PI) substrate with a 1oz electrolytic copper layer on the surface.

[0030] Assembly method: The contact part 1-1 (brass material, gold plated with 0.8μm) of the connecting device 1 is pressed with the rigid area 3-1 using a precision pressing machine, and the pressing pressure is set to 50N; the contact part 2-1 of the connecting device 2 is pressed with the rigid area 3-2 with the same parameters. After pressing, the flexible area 3-3 can deform freely to meet the 2mm compression requirement.

[0031] Application scenario: Internal conversion of low-frequency signals for small instruments and meters.

[0032] Based on the above embodiments, as a preferred embodiment of the rigid-flex printed circuit board, such as... Figure 4 and Figure 5 As shown, both rigid region 1 3-1 and rigid region 2 3-2 are provided with crimping holes 3-0 for crimping contact 1-1 and contact 2-1.

[0033] This embodiment is a preferred solution for crimping holes in rigid-flex printed circuit boards, achieving precise positioning and crimping: the crimping holes provide a clear assembly reference for the contacts, avoiding misalignment during crimping and improving crimping accuracy and consistency; simplifying the crimping process: the contacts can directly mate with the rigid area through the crimping holes without additional positioning fixtures, shortening assembly time and reducing reliance on worker skills; enhancing connection strength: the mechanical mating structure between the crimping holes and the contacts is less prone to loosening compared to simple surface crimping, improving the component's resistance to vibration and impact.

[0034] As a preferred implementation: Structural parameters: In the rigid region 3-1 and rigid region 3-2 of Example 1, φ1.0mm crimping holes 3-0 are opened with a contact spacing of 2mm. The hole walls are treated with immersion gold (gold layer thickness 0.5μm), and the hole position deviation is ≤±0.05mm.

[0035] Assembly method: Align the pin end of contact 1-1 with the crimping hole 3-0, and use a pneumatic press head (crimping speed 1mm / s) to press the pin into the hole until the pin end is flush with the back of the rigid area. After crimping, the hole wall and the pin are tightly fitted, and the tension is ≥10N.

[0036] Advantages verified: The crimping and positioning time has been reduced from the traditional 15s to 5s, and the assembly error rate has been reduced to below 0.5%.

[0037] Based on the above embodiments, as a preferred embodiment of the rigid-flex printed circuit board, one end of each of the first contact 1-1 and the second contact 2-1 is provided with a fisheye terminal 4 that is adapted to the crimping hole 3-0.

[0038] This embodiment is a preferred solution for having a fisheye terminal that matches the crimping hole at one end of the contact element, replacing the potting process: the interference fit between the fisheye terminal and the crimping hole can achieve a reliable connection without the need for potting sealant, significantly shortening the production cycle and reducing process complexity; it enables rapid assembly: the fisheye terminal can be directly inserted into the crimping hole to complete the connection without the need for complex crimping equipment, improving assembly efficiency and adapting to mass production; it ensures connection stability: the elastic deformation of the fisheye structure can compensate for assembly errors, while forming a tight contact, reducing contact resistance, and ensuring stable low-frequency signal transmission.

[0039] As a preferred implementation: Structural parameters: Contact 1-1 and Contact 2-1 are made of QBe2 beryllium bronze. One end is integrally formed with a fisheye terminal 4. The fisheye terminal has a diameter of 1.2mm and a length of 5mm and is compatible with a φ1.0mm crimping hole.

[0040] Assembly method: Manually insert the fisheye terminal 4 into the crimping hole 3-0 with an insertion force ≤3N. After insertion, the fisheye structure undergoes elastic deformation due to the interference fit, and fits tightly against the hole wall with a contact resistance ≤20mΩ.

[0041] Process comparison: No glue pouring is required, eliminating the glue pouring and curing process (which usually takes 24 hours), reducing the production time of a single component from 48 hours to 8 hours.

[0042] Based on the above embodiments, as a preferred embodiment of the rigid-flexible printed circuit board, the fisheye terminal 4 includes a tip 4-1 for direct insertion into the crimp hole 3-0, a step 4-3 that stops and cooperates with the end face of the crimp hole 3-0, and an elliptical hole structure 4-2 that is deformed under pressure between the tip 4-1 and the step 4-3.

[0043] This embodiment is a preferred solution for a fisheye terminal with a pointed tip, a stepped section, and an elliptical hole structure, which improves assembly convenience: the pointed tip can guide the fisheye terminal to be quickly inserted into the crimping hole, reducing assembly alignment time and simplifying operation; it achieves precise positioning: the stepped section and the end face of the crimping hole provide a stop fit, accurately positioning the insertion depth of the fisheye terminal, avoiding over-insertion or under-insertion, and ensuring assembly consistency; it enhances connection reliability: after being deformed under pressure, the elliptical hole structure fits tightly against the inner wall of the crimping hole, forming multi-point contact, improving the mechanical strength and electrical contact stability of the connection, while also having a certain buffering capacity to adapt to vibration conditions.

[0044] As a preferred implementation: Structural parameters: The tip 4-1 of the fisheye terminal 4 is a pointed tip with a conical angle of 30° and a length of 1mm; the step 4-3 has a diameter of 1.5mm and a thickness of 0.5mm; an elliptical hole 4-2 with a major axis of 1.2mm and a minor axis of 0.8mm is opened between the tip and the step, and the entire surface is gold-plated to 1μm.

[0045] Assembly process: Tip 4-1 guides the fisheye terminal to be quickly inserted into the crimping hole. When step 4-3 contacts the end face of the crimping hole, the insertion is stopped (the insertion depth is precisely controlled to 4mm). At this time, the elliptical hole 4-2 is deformed into a near circle under pressure, forming a 360° contact with the hole wall. The seismic resistance level meets the IEC60068-2-6 standard (10-2000Hz, acceleration 10g).

[0046] Reliability testing: After 1000 insertion and removal cycles and 500 hours of vibration testing, the change in contact resistance is ≤5mΩ.

[0047] Based on the above embodiments, as a preferred embodiment of the rigid-flex printed circuit board, one end of the contact 1-1 and the contact 2-1 are respectively used to press the rigid region 3-1 and the rigid region 3-2, and the other end of the contact 1-1 and the contact 2-1 are respectively used to surface mount the corresponding printed circuit board.

[0048] This embodiment is a preferred solution for surface mounting the corresponding printed circuit board at the other end of the contact, simplifying the connection process: by avoiding the secondary soldering problem of surface mount connectors, only one end of the surface mount connection can be completed using automated mounting equipment. Compared with traditional wire soldering or crimping, this improves assembly efficiency and reduces labor costs; it also improves integration: the surface mount connection between the contact and the printed circuit board reduces redundant connection structures, making the overall component more compact and adapting to the miniaturization requirements of equipment; and it ensures connection consistency: automated surface mounting avoids differences caused by human operation, reduces problems such as cold solder joints and false solder joints, and improves product quality stability.

[0049] As a preferred implementation: Structural parameters: The other end of contact 1-1 and contact 2-1 is a flat surface mount pad (size 2mm×1mm). The printed circuit board inside the connecting device is FR-4 substrate with corresponding pads (including Sn-Pb solder layer) on the surface.

[0050] Assembly method: The surface mount pads of the contact components are aligned with the pads of the printed circuit board using an SMT pick and place machine, and the connection is completed by reflow soldering (peak temperature 220℃, hold for 10s). The pad wetting rate is ≥95%.

[0051] Production efficiency: The assembly time for a single batch (1000 pieces) is reduced from 8 hours of traditional manual welding to 1 hour, and the rate of false welds is ≤0.1%.

[0052] A flexible printed circuit board assembly includes a connector 1 with a contact 1-1 and a connector 2 with a contact 2-1. The rigid regions 3-1 and 3-2 at both ends of the rigid-flex printed circuit board 3 described in any of the above embodiments are respectively pressed against one end of the contact 1-1 and the contact 2-1.

[0053] This embodiment is a basic embodiment of the flexible printed circuit board (PCB) assembly, and includes the following beneficial effects: Integrated and optimized structure: The connecting devices are integrated with the rigid-flex PCB, replacing the traditional dispersed structure of "connector + wire + terminal," simplifying the overall assembly structure and reducing assembly steps; Addressing many defects of traditional PCBs: Inheriting the advantages of rigid-flex PCBs, it simultaneously achieves direct docking of two connecting devices, avoiding wire transfer losses, improving signal transmission efficiency, and eliminating the need for potting and pre-correction, thus shortening the production cycle; Enhanced adaptability: The size and flexible area length of the rigid-flex PCB can be flexibly adjusted according to equipment installation requirements to adapt to different assembly spaces.

[0054] This flexible board assembly can be extended during assembly and directly crimped with connectors, significantly improving manufacturability. Its good flexibility facilitates mass production and installation. This assembly is used in TR (Transmission Line) assemblies, where demand is high. Replacing cable assemblies with this technology can promote the adoption of flexible board technology and increase market share.

[0055] As a preferred implementation: Composition structure: Connector 1 is a J30J-15TJP connector, connector 2 is a surface-mount terminal block, and the rigid-flex printed circuit board 3 (crimp hole + fisheye terminal structure) of embodiment 2 is adopted. The rigid area 1 is crimped with the contact 1 of the J30J connector, and the rigid area 2 is crimped with the contact 2 of the surface-mount terminal block.

[0056] Assembly process: ① Insert the fisheye terminal into the crimp hole of the rigid-flex printed circuit board; ② Surface mount the other end of the contact to the printed circuit board inside the connector; ③ Fix the housing of the connector to complete the assembly of the flexible board assembly. The total assembly time is ≤15min / piece.

[0057] Performance testing: The component transmits low-frequency signals with a frequency of 0-100kHz in an environment of 0-60℃ with an insertion loss of ≤0.1dB.

[0058] Based on the above embodiments, as a preferred embodiment of the flexible board assembly, the connecting device 1 includes a housing 1-0, a printed circuit board 1, one end of the contact 1-1 is pressed against the rigid region 3-1, and the other end is surface-mounted with the printed circuit board 1; the connecting device 2 includes a housing 2-0, a printed circuit board 2, one end of the contact 2-1 is pressed against the rigid region 3-2, and the other end is surface-mounted with the printed circuit board 2.

[0059] The flexible board assembly provided in this embodiment includes a housing and a printed circuit board (PCB). The preferred solution involves pressing and surface mounting the contacts at both ends, offering the following advantages: Improved structural integrity: The housing protects the internal PCB and contacts, enhancing the assembly's resistance to electromagnetic interference and mechanical protection; Efficient connection: One end of the contact is pressed against the rigid-flex PCB, while the other end is surface mounted to the PCB inside the connector, forming an efficient signal transmission path of "rigid-flex PCB - contact - connector PCB," reducing signal attenuation; Adaptation to automated production: The combination of surface mounting and pressing processes is compatible with automated production lines, significantly improving batch production efficiency and reducing reliance on skilled workers.

[0060] As a preferred implementation: Structural parameters: The housing 1-0 of connector 1 is made of zinc alloy die casting, with dimensions of 20mm×15mm×10mm, and has a 1.6mm thick FR-4 printed circuit board inside; the housing 2-0 of connector 2 is made of engineering plastic (PA66+30% glass fiber), and has a 1.2mm thick printed circuit board inside; one end of contact 1-1 is pressed to the rigid-flex printed circuit board, and the other end is surface-mounted to printed circuit board 1, and the same applies to contact 2.

[0061] Protection performance: The enclosure has an IP protection rating of IP54, which is dustproof and splashproof; electromagnetic shielding effectiveness ≥30dB (10kHz-1GHz).

[0062] Application scenario: Suitable for low-frequency signal interconnection in industrial control equipment.

[0063] Based on the above embodiments, as a preferred embodiment of the flexible plate assembly, the flexible region 3-3 is located on the same side of the connecting device 1 and the connecting device 2.

[0064] This embodiment is a preferred solution where the flexible area of ​​the flexible plate assembly is located on the same side of the two connecting devices, which has the following advantages: Optimized spatial layout: The flexible area is concentrated on the same side, avoiding interference with other parts of the equipment, adapting to compact installation space, and improving the layout flexibility of the assembly within the equipment; Convenient maintenance: The position of the flexible area is fixed, and the deformed parts can be quickly located during maintenance, reducing maintenance difficulty; Improved deformation stability: The flexible area is subjected to concentrated force, avoiding structural fatigue caused by dispersed deformation and extending the service life of the assembly.

[0065] As a preferred implementation: Structural design: Connector 1 and Connector 2 are arranged side by side with a spacing of 30mm. The flexible area 3-3 of the rigid-flex printed circuit board is located on the upper side of the two devices. The width of the flexible area is the same as that of the rigid area (8mm), and the bending radius is ≥5mm.

[0066] Space adaptability: The overall thickness of the component is ≤12mm, which can be embedded in the narrow installation space of the equipment (15mm wide). When the flexible area is compressed by 2mm, there is no interference with the equipment housing.

[0067] Fatigue test: After 10,000 compression-recovery cycles (compression amount 2mm, frequency 1Hz), the flexible area showed no cracks and the copper layer showed no fractures.

[0068] Based on the above embodiments, as a preferred embodiment of the flexible plate assembly, an elastic element for auxiliary positioning is provided between the connecting device 1 and the connecting device 2.

[0069] This embodiment is a preferred solution for providing an auxiliary positioning elastic element between two connecting devices in a flexible printed circuit board assembly, which has the following beneficial effects: Achieving precise assembly: The elastic element can assist the two connecting devices in quick alignment during assembly, reducing assembly errors and improving assembly efficiency; Compensating for assembly tolerances: The deformation capability of the elastic element can compensate for the dimensional tolerances between the connecting devices and the rigid-flex printed circuit board, ensuring reliable connection; Buffering external stress: When the equipment vibrates or the temperature changes, the elastic element can absorb impact and deformation stress, preventing damage to the rigid-flex printed circuit board or contact parts due to stress concentration, and improving the reliability of the assembly.

[0070] As a preferred implementation: Elastic component parameters: A U-shaped elastic sheet made of stainless steel (SUS304) (thickness 0.3mm, width 5mm, length 20mm) with an elastic coefficient of 5N / mm is placed between the bottom of connector 1 and connector 2.

[0071] Assembly assistance: During assembly, the preload (2N) of the elastic sheet pushes the two connecting devices toward the rigid-flexible printed circuit board, achieving automatic alignment with an alignment error of ≤0.1mm, and reducing the assembly time from 20s to 8s.

[0072] Tolerance compensation: When there is a dimensional tolerance of ±0.2mm between the connecting device and the rigid-flex printed circuit board, the elastic sheet can compensate for the deformation to ensure a reliable fit between the contact and the crimp hole.

[0073] A connector includes the flexible board assembly described in any of the above embodiments. It offers the following advantages: improved connector performance: inheriting all the advantages of the flexible board assembly, the connector features high production efficiency, simple assembly, and stable quality, overcoming the shortcomings of traditional low-frequency connectors that rely on wires; enhanced adaptability: flexible board assemblies with different structures can be selected according to different low-frequency signal transmission requirements, adapting to equipment in various fields such as communication and instrumentation; reduced usage costs: the connector has a short production cycle and low failure rate, reducing not only manufacturing costs but also subsequent maintenance costs, thus improving economic efficiency.

[0074] As a preferred implementation: Connector structure: The connector as a whole adopts the flexible board assembly (including housing, surface mount printed circuit board, and fisheye crimp rigid-flex printed circuit board) in the above embodiments. J30J plug and surface mount interface are respectively provided at both ends. The housing is a metal shield (nickel-plated steel plate).

[0075] Performance specifications: Rated voltage 250V, rated current 3A, insulation resistance ≥1000MΩ, withstand voltage 1000VAC / 1min without breakdown.

[0076] Mass production: Utilizing an automated production line (integrated crimping, mounting, and assembly), daily output is increased 10 times compared to traditional cable assemblies, while unit cost is reduced by 30%.

[0077] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0078] The above content shows and describes the basic principles, main features, and beneficial effects of this utility model. The above description is merely a preferred embodiment of this utility model and is not intended to limit it. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rigid-flex printed circuit board, comprising a rigid region one (3-1) and a rigid region two (3-2) at both ends, wherein a flexible region (3-3) is located between the rigid region one (3-1) and the rigid region two (3-2), characterized in that: The rigid region one (3-1) and rigid region two (3-2) are respectively used to press the contact one (1-1) of the connecting device one (1) and the contact two (2-1) of the connecting device two (2).

2. The rigid-flex printed circuit board according to claim 1, characterized in that: Both rigid region one (3-1) and rigid region two (3-2) are provided with crimping holes (3-0) for crimping contact one (1-1) and contact two (2-1).

3. The rigid-flex printed circuit board according to claim 2, characterized in that: One end of each of the first contact (1-1) and the second contact (2-1) is provided with a fisheye terminal (4) that is compatible with the crimping hole (3-0).

4. The rigid-flex printed circuit board according to claim 3, characterized in that: The fisheye terminal (4) includes a tip (4-1) for direct insertion into the crimping hole (3-0) and a step (4-3) that stops and engages with the end face of the crimping hole (3-0). Between the tip (4-1) and the step (4-3) is an elliptical hole structure (4-2) that is deformed under pressure.

5. The rigid-flex printed circuit board according to any one of claims 1-4, characterized in that: One end of the first contact (1-1) and the second contact (2-1) are used to press the first rigid region (3-1) and the second rigid region (3-2) respectively, and the other end of the first contact (1-1) and the second contact (2-1) are used to surface mount the corresponding printed circuit board.

6. A flexible plate assembly, comprising a first connector (1) with a first contact (1-1) and a second connector (2) with a second contact (2-1), characterized in that: The rigid region one (3-1) and rigid region two (3-2) at both ends of the rigid-flexible printed circuit board (3) according to any one of claims 1-5 are respectively pressed into one end of the contact member one (1-1) and contact member two (2-1).

7. The flexible plate assembly according to claim 6, characterized in that: The first connecting device (1) includes a housing (1-0) and a printed circuit board (PCB). One end of the first contact (1-1) is pressed against the first rigid region (3-1), and the other end is surface-mounted with the first PCB. The second connecting device (2) includes a housing (2-0) and a PCB. One end of the second contact (2-1) is pressed against the second rigid region (3-2), and the other end is surface-mounted with the second PCB.

8. The flexible board assembly according to claim 6 or 7, characterized in that: The flexible region (3-3) is located on the same side of the connecting device one (1) and the connecting device two (2).

9. The flexible plate assembly according to claim 8, characterized in that: An elastic element for auxiliary positioning is provided between the first connecting device (1) and the second connecting device (2).

10. A connector, characterized in that: Includes the flexible plate assembly as described in any one of claims 6-9.

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