Splicing structure and method of rigid-flex board cable

Abstract

The invention relates to a continuous connection structure and method of a rigid-flexible combined board, and the structure comprises a rigid printed board transverse projection structure, the surface of the rigid printed board transverse projection structure is provided with a welding surface, the welding surface is provided with flexible structures, and the mode of assembling and connecting the rigid printed board transverse projection structure and a plurality of flexible structures is adopted. By utilizing the characteristic that the length of the flexible structure can be automatically controlled, the rigid-flexible combined board with any length can be processed, and by arranging the bosses at the end parts of the transverse bulge structures of the rigid printed board, a plurality of welding surfaces are formed and are used for being welded with a plurality of flexible structures, so that the stability and reliability of the welding structure can be enhanced, and the reliability of a product is improved; the operation is simple, special requirements on processing equipment are met, and the production cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of flexible cables, and in particular to a connection structure and method of a rigid-flexible board. Background Art

[0002] Rigid-flex boards are important components of rigid-flex cables, but due to the limitation of equipment processing size, the maximum processing size of rigid-flex boards can only reach 1000mm*600mm; but in actual system applications, the overall demand puts forward the demand for rigid-flex cable assembly products with lengths of 1.5 meters, 2.5 meters, 2.9 meters, 5 meters, 10 meters, etc. To solve this problem, the usual practice is to solve the problem from the production equipment, and realize the production of rigid-flex boards with a length of more than 1.5 meters through equipment modification, process improvement or introduction of new equipment, but the equipment cost is too high. Even if equipment is introduced or technical transformation is carried out, there is still a limit on the length of the product, which cannot meet various length requirements, and the product qualification rate is low.

[0003] For example, the patent application document with publication number CN115515343A specifically discloses an ultra-long multi-layer flexible area bonded rigid-flexible board and its processing method, which solves the problem of poor filling of the bonding between soft boards in the process of producing ultra-long multi-layer flexible area bonded rigid-flexible boards, resulting in uncompacted holes and stratified bubbles, and effectively improves the pressure filling performance, making multiple soft boards more firmly bonded during the pressing process, effectively preventing the existence of voids and stratified bubbles between soft boards, ensuring product reliability, and meeting customer quality requirements for rigid-flexible boards. However, it does not solve customer requirements for the length of rigid-flexible boards.

[0004] For example, the patent application document with the publication number CN212544169U specifically discloses an ultra-long multi-layer flexible structural component, including a flexible area and rigid areas welded to the two ends of the flexible area. Because the two ends of the flexible area are respectively provided with a reinforcement structure at the intersection with the rigid area, the reinforcement structure includes a flexible receiving groove, a crossbeam, a screw column, and an adhesive coating. When in use, first use one end of the flexible area to pass through the flexible receiving groove to the other side of the rigid area, and then use the middle end of the crossbeam to precisely fit the flexible area, and the two ends of the crossbeam are fixed to the rigid area through screw columns. The adhesive layer is coated between the inner surface of the crossbeam and the upper surface of the flexible area, so that the flexible area can be precisely fitted and fixed at the specified position on the rigid area. This technology is for the connection performance of the flexible structure connection point.

[0005] In summary, the current existing technology still fails to solve the customer's requirements for various lengths of rigid-flex boards. Therefore, a method for lengthening a rigid-flex board that can meet the customer's requirements for various lengths of rigid-flex boards is designed without introducing special equipment and conducting targeted technical changes. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a connection structure and method for a rigid-flexible board.

[0007] The present invention is implemented in this way, providing a connection structure of a rigid-flexible board, characterized in that it includes a lateral protrusion structure of a rigid printed board, a welding surface is arranged on the surface of the lateral protrusion structure of the rigid printed board, and a flexible structure is arranged on the welding surface.

[0008] Furthermore, the right end of the transverse protruding structure of the rigid printed circuit board is arranged as a boss, and the number of the bosses arranged is at least one.

[0009] Furthermore, the number of the welding surfaces is at least 4, and for every additional boss, the number of the welding surfaces increases by 2.

[0010] Furthermore, the welding surface includes a first welding surface, a second welding surface, a third welding surface and a fourth welding surface, the first welding surface and the second welding surface are symmetrical about the horizontal center axis of the lateral protrusion structure of the rigid printed circuit board, and the third welding surface and the fourth welding surface are symmetrical about the horizontal center axis of the boss.

[0011] Furthermore, a pad A is provided at the right end portion of the first welding surface in contact with the flexible structure, and a pad A is provided at the right end portion of the second welding surface in contact with the flexible structure, and the positions of the pads A of the first welding surface and the pads A of the second welding surface correspond to each other.

[0012] Furthermore, a pad A is provided at the right end of the third welding surface in contact with the flexible structure, and a pad A is provided at the right end of the fourth welding surface in contact with the flexible structure, and the pad A of the third welding surface corresponds to the pad A of the fourth welding surface.

[0013] Furthermore, a pad B is provided on the surface of the flexible structure in contact with the welding surface, and the pad B corresponds to the position of the welding point on the pad A, and the number of the welding points is 3-6.

[0014] Furthermore, the pad B (9) and the pad A (8) are configured as surface mount gold fingers.

[0015] Another object of the present invention is to provide a method for connecting a connection mechanism of a rigid-flexible board, the method for connecting a rigid-flexible board comprising the following steps:

[0016] (1) Set the rigid-wound combined board >1.5 meters as a rigid printed board lateral protrusion structure and multiple flexible structures;

[0017] (2) The end of the rigid printed circuit board transverse protrusion structure is set as a transverse protrusion structure, a vertically symmetrical welding surface is set on the surface of the rigid printed circuit board transverse protrusion structure, and the same number of the flexible structures as the welding surfaces are set;

[0018] (3) a surface mount gold finger pad A is provided at the end of the welding surface, and a surface mount gold finger pad B is provided on the single side surface of the flexible structure, wherein the soldering point positions of the pad A and the pad B correspond to each other;

[0019] (4) placing the surface of the flexible structure provided with the pad B on the welding surface so that the welding point of the pad A and the welding point of the pad B overlap, and then welding the overlapping welding points;

[0020] (5) After welding, glue is placed at the welding point to complete the assembly of the rigid-flexible board >1.5 meters.

[0021] Furthermore, the flexible structure is a flexible printed circuit board, and its length is adjustable.

[0022] In summary, the beneficial effects of the present invention are:

[0023] (1) The present invention adopts a rigid printed circuit board transverse protrusion structure and a plurality of flexible structures for assembly and connection; and utilizes the characteristic that the length of the flexible structure can be controlled by itself to process a rigid-flexible board of any length.

[0024] (2) The present invention provides bosses at the ends of the transverse protruding structures of the rigid printed circuit board to form multiple welding surfaces for welding with multiple flexible structures, thereby enhancing the stability and reliability of the welding structure and improving the reliability of the product.

[0025] (3) The connection structure of the present invention has low requirements for processing equipment and low production costs, which achieves the feasibility of equipment production and processing, solves the high cost problem of equipment upgrade and equipment modification, and shortens the product production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0027] Figure 1 It is a front structural schematic diagram of a first embodiment of a lateral protrusion structure of a rigid printed circuit board of the present invention;

[0028] Figure 2 is a top view of a first embodiment of a lateral protrusion structure of a rigid printed circuit board of the present invention;

[0029] Figure 3 It is a schematic diagram of the front structure of the flexible structure of the present invention;

[0030] Figure 4is a top view of the flexible structure of the present invention;

[0031] Figure 5 It is a schematic diagram corresponding to the first embodiment of the lateral protrusion structure of the rigid printed circuit board of the present invention and the flexible structure pad;

[0032] Figure 6 It is a schematic diagram of the connection structure of the first embodiment of the rigid-flex board of the present invention;

[0033] Figure 7 It is a schematic diagram of the connection structure of the second embodiment of the rigid-flex board of the present invention;

[0034] Explanation of the accompanying drawings: 1-lateral raised structure of the rigid printed circuit board, 2-flexible structure, 3-boss, 4-first welding surface, 5-second welding surface, 6-third welding surface, 7-fourth welding surface, 8-pad A, 9-pad B, 10-fifth welding surface, 11-sixth welding surface. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Combination Figures 1 to 7 The figure shows a specific embodiment of a rigid-flexible board connection structure and method provided by the present invention, and the specific contents are as follows:

[0037] The first embodiment of the present invention provides a connection structure of a rigid-flexible board, including a rigid printed board transverse protrusion structure 1, a welding surface is arranged on the surface of the rigid printed board transverse protrusion structure 1, and a flexible structure 2 is arranged on the welding surface. The rigid printed board transverse protrusion structure 1 and the flexible structure 2 are arranged to be assembled and connected, and the manufacturability of the rigid printed board structure and the manufacturability of the purely flexible long printed board are utilized. By arranging a boss 3 at the end of the rigid printed board transverse protrusion structure 1, the rigid printed board transverse protrusion structure 1 and the flexible structure 2 are connected, so as to achieve the effect of connecting a rigid-flexible board with a length of more than 1.5 meters.

[0038] In this embodiment, the right end of the rigid printed circuit board transverse protrusion structure 1 is set as a boss 3, and the number of the boss 3 is at least one. The number of the boss 3 can be increased according to actual needs to meet various connection requirements.

[0039] like Figure 6As shown, the number of the boss 3 is set to 1, the number of the welding surfaces is 4, including a first welding surface 4, a second welding surface 5, a third welding surface 6 and a fourth welding surface 7, and the number of the flexible structures 2 is 4.

[0040] In this embodiment, the number of the welding surfaces is at least 4. For every additional boss 3, the number of the welding surfaces increases by 2. The upper and lower surfaces of the boss 3 are both provided with welding surfaces. Therefore, the number of welding surfaces is set to an even number, thereby enhancing the stability of the welding structure.

[0041] In this embodiment, the welding surface includes a first welding surface 4, a second welding surface 5, a third welding surface 6 and a fourth welding surface 7. The first welding surface 4 and the second welding surface 5 are symmetrical about the horizontal center axis of the rigid printed circuit board lateral protrusion structure 1, and the third welding surface 6 and the fourth welding surface 7 are symmetrical about the horizontal center axis of the boss 3. The symmetrical setting enhances the stability and reliability of the connection structure.

[0042] In this embodiment, a pad A8 is set at the right end portion of the first welding surface 4 that contacts the flexible structure 2, and a pad A8 is set at the right end portion of the second welding surface 5 that contacts the flexible structure 2. The pad A8 of the first welding surface 4 corresponds to the pad A8 of the second welding surface 5 in position. By setting the pad, a fixed connection between the welding surface and the flexible structure 2 is achieved. The symmetrical setting of the pad ensures the stability of the welding effect and improves the reliability of the welding structure.

[0043] In this embodiment, a pad A8 is set at the right end portion of the third welding surface 6 that contacts the flexible structure 2, and a pad A8 is set at the right end portion of the fourth welding surface 7 that contacts the flexible structure 2. The pad A8 of the third welding surface 6 corresponds to the pad A8 of the fourth welding surface 7 in position. The fixed connection between the welding surface and the flexible structure 2 is achieved by setting the pads. The symmetrical setting of the pads ensures the stability of the welding effect and improves the reliability of the welding structure.

[0044] In this embodiment, a pad B9 is set on the surface of the flexible structure 2 that contacts the welding surface, and the pad B9 corresponds to the position of the soldering point on the pad A8. The number of the soldering points is 3-6, which enhances the welding reliability. Six soldering points are preferred. When three soldering points are used, the area of ​​each soldering point is larger than the area of ​​each soldering point when six soldering points are used.

[0045] In this embodiment, the pads B9 and A8 are configured as surface mount gold fingers, which are thin and flat, thereby improving the connection stability and reliability of the welding process.

[0046] The second embodiment of the present invention is as follows Figure 7As shown, the number of bosses 3 is set to 2, the number of welding surfaces is 6, including a first welding surface 4, a second welding surface 5, a third welding surface 6, a fourth welding surface 7, a fifth welding surface 10 and a sixth welding surface 11, and the number of flexible structures 2 is 6.

[0047] The method for connecting a rigid-flex board structure provided by an embodiment of the present invention comprises the following steps:

[0048] Step 1: Set the rigid-wound combined board of >1.5 meters as a rigid printed board transverse protrusion structure 1 and multiple flexible structures 2;

[0049] Step 2: The end of the rigid printed circuit board transverse protrusion structure 1 is set as a transverse protrusion structure 3, a vertically symmetrical welding surface is set on the surface of the rigid printed circuit board transverse protrusion structure 1, and the same number of the flexible structures 2 as the welding surface is set;

[0050] Step 3: a surface mount gold finger pad A8 is provided at the end of the welding surface, and a surface mount gold finger pad B9 is provided on a single side surface of the flexible structure 2, wherein the soldering point positions of the pad A8 and the pad B9 correspond to each other;

[0051] Step 4: Place the surface of the flexible structure 2 provided with the pad B9 on the welding surface, so that the welding point of the pad A8 and the welding point of the pad B9 overlap, and then weld the overlapping welding points;

[0052] Step 5: After welding, place glue at the welding point to complete the assembly of the rigid-flexible board > 1.5 meters.

[0053] In this embodiment, the flexible structure 2 is a flexible printed circuit board, and its length is adjustable, which can meet the requirements of different connection lengths.

[0054] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A connection structure of a rigid-flex board, characterized in that: The invention comprises a rigid printed circuit board transverse protrusion structure (1), a welding surface is arranged on the surface of the rigid printed circuit board transverse protrusion structure (1), and a flexible structure (2) is arranged on the welding surface.

2. The connection structure of the rigid-flex board according to claim 1, characterized in that: The right end of the rigid printed circuit board transverse protrusion structure (1) is arranged as a boss (3), and the number of the boss (3) arranged is at least one.

3. The connection structure of the rigid-flex board according to claim 2, characterized in that: The number of the welding surfaces is at least 4, and for each additional boss (3), the number of the welding surfaces increases by 2.

4. The connection structure of the rigid-flex board according to claim 3, characterized in that: The welding surface comprises a first welding surface (4), a second welding surface (5), a third welding surface (6) and a fourth welding surface (7); the first welding surface (4) and the second welding surface (5) are symmetrical about the horizontal center axis of the rigid printed circuit board transverse protrusion structure (1); and the third welding surface (6) and the fourth welding surface (7) are symmetrical about the horizontal center axis of the boss (3).

5. The connection structure of the rigid-flex board according to claim 4, characterized in that: A soldering pad A (8) is provided at the right end portion of the first soldering surface (4) in contact with the flexible structure (2), and a soldering pad A (8) is provided at the right end portion of the second soldering surface (5) in contact with the flexible structure (2), and the positions of the soldering pad A (8) of the first soldering surface (4) and the soldering pad A (8) of the second soldering surface (5) correspond to each other.

6. The connection structure of the rigid-flex board according to claim 4, characterized in that: A soldering pad A (8) is provided at the right end portion of the third soldering surface (6) in contact with the flexible structure (2), and a soldering pad A (8) is provided at the right end portion of the fourth soldering surface (7) in contact with the flexible structure (2), and the positions of the soldering pad A (8) of the third soldering surface (6) and the soldering pad A (8) of the fourth soldering surface (7) correspond to each other.

7. The connection structure of the rigid-flex board according to claim 1, characterized in that: A soldering pad B (9) is arranged on the surface of the flexible structure (2) that contacts the soldering surface. The soldering pad B (9) corresponds to the soldering point position on the soldering pad A (8). The number of the soldering points is 3-6.

8. The connection structure of the rigid-flex board according to claim 7, characterized in that: The pad B (9) and the pad A (8) are configured as surface mount gold fingers.

9. A method for connecting a rigid-flex board according to any one of claims 1 to 8, characterized in that: The method for connecting the rigid-flex board comprises the following steps: S1: The rigid-wound combined board with a length of more than 1.5 meters is set as a rigid printed board transverse protrusion structure (1) and multiple flexible structures (2); S2: The end of the rigid printed circuit board transverse protrusion structure (1) is set as a transverse protrusion structure (3), a vertically symmetrical welding surface is set on the surface of the rigid printed circuit board transverse protrusion structure (1), and the same number of the flexible structures (2) as the welding surfaces is set; S3: a surface mounted gold finger pad A (8) is provided at the end of the welding surface, and a surface mounted gold finger pad B (9) is provided on a single side surface of the flexible structure (2), wherein the soldering point positions of the pad A (8) and the pad B (9) correspond to each other; S4: placing the surface of the flexible structure (2) provided with the soldering pad B (9) on the welding surface, so that the soldering point of the soldering pad A (8) and the soldering point of the soldering pad B (9) overlap, and then welding the overlapped soldering points; S5: After welding, glue is placed at the welding point to complete the assembly of the rigid-flexible board >1.5 meters.

10. The method for connecting a rigid-flex board according to claim 9, characterized in that: The flexible structure (2) is a flexible printed circuit board, and its length is adjustable.

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