CN113325527B

CN113325527B - Active connector and rigid-flexible printed board assembly thereof

Info

Publication number: CN113325527B
Application number: CN202110587673.1A
Authority: CN
Inventors: 殷向阳; 周超; 黄锦源; 张新建
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2022-04-01
Anticipated expiration: 2041-05-27
Also published as: CN113325527A

Abstract

The utility model provides an active connector, includes the electric plug, just gentle printed board subassembly and optical cable subassembly, the electric plug includes the electric plug casing and locates the electric mortice needle in the electric plug casing, and optical cable subassembly includes the sleeve that extends along the fore-and-aft direction, and telescopic front end is equipped with the external screw thread that sets up on the electric plug casing periphery and cooperatees in order to realize the coupling nut of optical cable subassembly and electric plug assembly, and the sleeve front end is equipped with the convex key, and electric plug casing rear end is equipped with and makes with the convex key cooperation in order to twist the in-process at coupling nut the recess of sleeve along the axial translation forward, just gentle printed board subassembly's front end is equipped with the jack, and just gentle printed board subassembly is installed at the rear end of electric plug casing and is twisted to the back that targets in place with telescopic front end butt in order to realize axial positioning at optical cable subassembly, and electric mortice needle plug cooperation this moment. The invention can avoid the torsion damage of the optical fiber in the connector, so that the rigid-flexible printed board assembly is easy to assemble and repair, and the stress of the pins of the optical module is avoided.

Description

Active connector and rigid-flexible printed board assembly thereof

Technical Field

The invention belongs to the technical field of connectors, and particularly relates to an active connector and a rigid-flexible printed board assembly thereof.

Background

Compared with the traditional communication cable, the optical fiber has the advantages of light weight, low loss, electromagnetic interference resistance, high transmission rate and the like, and is increasingly used in the civil and military industries. However, in use, it is found that, in the case of the optical connector which needs to be plugged or unplugged, besides the quality factor of the equipment itself, the contamination of the optical connector can also result in the increase of the link loss and even the damage of the optical transmission system. In order to avoid equipment performance failure caused by end surface pollution, a user needs to inspect and maintain an optical path in a network in a fixed period through a special instrument, a large amount of manpower and material resources are consumed, and meanwhile, the normal operation period of equipment is also influenced. In such an environment, active optical cable assemblies have emerged. The active optical cable component is characterized in that the photoelectric conversion circuit is stripped from the integrated equipment and integrated in the connector, the connection interface of the connector is realized through the electric contact piece, and the optical fiber connection interface is sealed in the shell of the connector accessory, so that the optical fiber transmission is realized, the problem of optical pollution is fundamentally solved, the plugging and unplugging adaptability of the connector in a severe environment is enhanced, and the reliability of an optical network is obviously improved.

The active optical cable assembly is formed by refitting the existing connector under the condition of not changing the electrical interface of the existing connector, and the normal use of the mating connector is not influenced. The round active optical cable assembly has the characteristics of quick locking, large accessory space, strong tensile strength, strong waterproof capability and the like, and is particularly suitable for severe environments which have large installation space and need to be frequently disassembled, such as field operation retraction, laying and the like; the large accessory space can contain a plurality of layers of printed boards, so that relatively complex signal processing is completed.

Referring to fig. 1, the structure of the current active connector generally includes a combination of an electrical connector plug 100, a sleeve member 200, and an optical cable assembly 300, which are connected by screw-thread fit; the printed board assembly 400 is mounted in the internal cavity of the electrical connector and sleeve member, which has the disadvantage that during assembly of the cable assembly 3, the cable 600 must be controlled from following rotation and the twisting of the optical fibers 302 cannot be seen, with the risk of fiber breakage, when the tail sleeve 301 and tail nut 500 are tightened.

Referring to fig. 2, in the prior art, a printed board is used as a carrier for photoelectric conversion in an active optical cable connector, and in order to fully utilize the cylindrical cavity space of the connector, the structure form of the connector is a rigid-flexible-rigid form, and the connector cannot be in a fixed form, a structural member needs to be assembled into a whole in an auxiliary manner, so that the connector can be assembled better. Referring to fig. 3, the flexible board 401 is bent, the rigid boards 402 are supported by an annular gasket 403, the annular gasket and the rigid printed board are bonded and fixed by epoxy glue, and the laser 404 and the detector 405 are directly welded to the rigid printed board at the rear end. This fixing has the following drawbacks:

firstly, in order to ensure the consistency of bonding and firm bonding, a special tool needs to be designed for ensuring, and the assembly process is complex;

secondly, when the glue is coated, the glue solution is easy to flow to a non-bonding surface, and hidden quality troubles exist;

and thirdly, the curing period of the glue solution is long, so that the assembly period of the product is influenced.

And fourthly, the annular gasket and the rigid printed board need a large enough matching surface to ensure reliable bonding, and the limited space for placing the printed board devices is occupied.

And the glue solution is bonded and fixed, the reworkability is poor, heating treatment is needed during disassembly, and the risk of damaging the printed board exists.

Sixthly, because the heights of the laser and the detector are different, the smooth surface positioning surfaces are inconsistent, namely the smooth surfaces are not on the same horizontal plane in the axial direction, welding and fixing the laser and the detector easily causes stress on welding spots of the laser and the detector, and the hidden danger of damage exists.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an active connector and a rigid-flexible printed board assembly thereof, which can avoid the torsion damage of optical fibers in the connector, make the rigid-flexible printed board assembly easy to assemble and repair, and avoid the stress of pins of an optical module.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. An active connector according to the present invention includes an electrical plug, a rigid-flexible printed board assembly, and an optical cable assembly, the electric plug comprises an electric plug shell and an electric plug pin arranged in the electric plug shell, the optical cable assembly comprises a sleeve extending along the front-back direction, the front end of the sleeve is provided with a connecting nut which is matched with external threads arranged on the periphery of the electric plug shell to realize the assembly of the optical cable assembly and the electric plug, the front end of the sleeve is provided with a convex key, the rear end of the electric plug shell is provided with a groove which is matched with the convex key to enable the sleeve to move forwards along the axial direction in the screwing process of the connecting nut, the front end of the rigid-flexible printed board assembly is provided with a jack, the rigid-flexible printed board assembly is installed at the rear end of the electric plug shell and is connected with the front end of the sleeve in an abutting mode to achieve axial positioning after the optical cable assembly is screwed in place, and at the moment, the jack is in plug-in fit with the electric plug pin to achieve conductive connection of the electric plug and the rigid-flexible printed board assembly.

Furthermore, the rigid-flexible printed board assembly comprises rigid printed boards which are arranged at intervals in the front and back and flexible printed boards which enable the rigid printed boards to be electrically connected, and the rigid printed boards are fixed together through a support piece; the jack is arranged on the rigid printed board at the front end, the module support frame is arranged on the rigid printed board at the rear end, the optical module is arranged on the module support frame, and the optical module is electrically connected with the rigid printed board through the flexible board.

Furthermore, the module support frame is U-shaped and comprises an installation part and support parts symmetrically arranged on two sides of the installation part, the support parts are bent towards the radial direction to form fixing parts, and the fixing parts are fixedly connected with the rigid printed board; and a space for accommodating the optical module is formed between the module support frame and the rigid printed board.

Furthermore, the optical module comprises a laser and a detector, and the rear end light surfaces of the laser and the detector are located on the same diameter surface in the axial direction.

Furthermore, an optical fiber contact pin is fixedly arranged in the sleeve through a contact pin mounting plate, the rear end of the optical fiber contact pin is connected with an optical fiber in the optical cable, and the front end of the optical fiber contact pin is correspondingly contacted and conducted with the rear end light surface of the laser and the detector.

Furthermore, the mounting part is provided with a clamping groove for mounting the optical module, and the clamping groove is provided with an opening for radially embedding the optical module. The detector and the laser are respectively provided with a flange, after the optical module is clamped in the clamping groove, the flange is in axial stop fit with the mounting plate body at the clamping groove, and the optical module is limited forwards in the axial direction.

Furthermore, a connecting cover plate is arranged at the rear end of the module supporting frame, and a radial positioning through hole for the light module to penetrate is formed in the connecting cover plate.

Furthermore, each fixing part is convexly provided with a positioning key, the rear end of the electric plug shell is provided with a positioning key groove matched with the positioning key, and when the rigid-flexible printed board assembly is buckled at the rear end of the electric plug shell, the positioning key and the positioning key groove are axially in stop fit to realize axial forward positioning and radial rotation stopping of the rigid-flexible printed board assembly.

Furthermore, the sizes of the two positioning keys are different so as to realize the error-proofing of the rigid-flexible printed board assembly.

Furthermore, the supporting piece comprises a first supporting piece and a second supporting piece, the first supporting piece penetrates through all the rigid printed boards in the front-back direction and is welded with all the rigid printed boards, the second supporting piece is sleeved outside the first supporting piece, and the second supporting piece is abutted between the adjacent rigid printed boards.

Furthermore, a guide hole is formed in the connecting cover plate, and a guide column which is matched with the guide hole in an axial guide mode is arranged on the contact pin mounting plate.

Compared with the prior art, the invention has the beneficial effects that:

1. the active connector provided by the invention is a connector with a two-body structure, can realize one-step screwing of an optical cable assembly and an electric connector plug, can avoid the risk of torsion damage of optical fibers in the interior, and is simpler in structural composition.

2. The invention designs a rigid-flexible printed board assembly, on one hand, a novel series structure is provided, a plurality of rigid-flexible printed boards are fixed together, and the design scheme is simple to operate, easy to repair and space-saving; on the other hand, the optical module support frame is designed, so that the problem of stress of pins of an optical module in the prior art can be solved, the axial and radial positioning of the optical module can be more accurately realized, and the optical module support frame has an anti-misassembly function.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of a prior art active connector.

Fig. 2 to 3 are schematic structural views of a rigid-flexible printed board assembly in the prior art.

Fig. 4 is a schematic diagram of an active connector according to the present invention.

Fig. 5 is a perspective view of an electrical plug and cable assembly.

Fig. 6 is a perspective view of a rigid-flexible printed board assembly (without an attachment cover plate).

Fig. 7 is a schematic cross-sectional view of a rigid-flexible printed board assembly.

Fig. 8 is a side view of a rigid-flexible printed board assembly.

Fig. 9 is an enlarged view of a portion a of fig. 7.

Fig. 10 is a perspective view of the support member.

Fig. 11 is a structural view of the module support frame.

Fig. 12 is a perspective view of a rigid-flexible printed board assembly.

Fig. 13 is a schematic view of the rigid-flexible printed board assembly installed into an electrical plug.

Fig. 14 is a schematic view of an active connector with a dust cap.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments.

An embodiment of an active connector, shown in fig. 4-13, comprises an electrical plug 1, a rigid-flexible printed board assembly 2, and an optical cable assembly 3; the electric plug 1 is an existing standard plug and comprises an electric plug shell 11 extending along the front-back direction, external threads are arranged on the periphery of the electric plug shell 11, an insulator and a contact element arranged on the insulator are arranged in the electric plug shell, the front end of the contact element is a wire spring hole contact element in plug-in fit with the adapter connector, and the rear end of the contact element is an electric plug pin extending backwards and extending out of the rear end face of the insulator.

Optical cable subassembly 3 includes the sleeve 31 that extends along the fore-and-aft direction, and the front end of sleeve 31 is equipped with coupling nut 32, and coupling nut 32 is used for closing with the one step of twisting of realizing optical cable subassembly and electric plug with the external screw thread fit on the electric plug casing 11 periphery, is equipped with contact pin mounting panel 4 in the sleeve, is equipped with a plurality of optic fibre contact pin 5 on the contact pin mounting panel 4. The optical fiber contact pin is an existing optical fiber contact pin with axial elastic floating capacity, the front end of the optical fiber contact pin is a needle head used for being connected with an optical module, the rear end of the optical fiber contact pin is connected with an optical fiber in an optical cable, and a spring is arranged inside the optical fiber contact pin so as to realize elastic insertion with the rear end smooth surface of the optical module; in this embodiment, the pin mounting plate 4 may be fixed to the inner wall of the sleeve 31 by using a snap spring. Furthermore, a convex key 311 extending forwards along the axial direction is arranged on the front end face of the sleeve 31, a groove 111 corresponding to the convex key is formed in the rear end face of the electrical plug shell 11, when the optical cable assembly and the electrical plug are fastened through threads, the convex key and the groove are aligned in advance, the sleeve is clamped to prevent the sleeve from rotating, the connecting nut 32 is rotated, the sleeve is translated along the axial direction in the assembling process, the rotating action relative to the electrical plug shell is avoided, and after the assembly is in place, the key groove is matched, and the sleeve cannot rotate relative to the electrical plug shell; in the whole assembling process, the optical fiber 61 in the sleeve is ensured not to be subjected to torsion, so that the product is more reliable. The optical cable rear end sealing connection has optical cable 6, specifically, sleeve rear end inside is equipped with presss from both sides cover 7, presss from both sides the cover and with optical cable 6 periphery interference fit for the optical cable has certain axial tensile strength, is equipped with seal 8 in pressing from both sides the cover, and the seal endotheca is established the optical cable, the two also can be interference fit, and optic fibre in the optical cable is connected with the rear end of optic fibre contact pin 5 after wearing out from the seal. The rear end of the sleeve is also provided with a tail accessory 9 which is used for fixing the optical cable and has waterproof sealing performance, the tail accessory is in the prior art, the tail accessory is screwed at the rear end of the sleeve through an accessory nut 91, so that a pressing sleeve inside the tail accessory and the optical cable are mutually pressed to fix the optical cable in the tail accessory, and a tail spring 92 arranged at the rear end of the tail accessory is sleeved on the optical cable 6 and used for preventing the optical cable from being broken and damaged.

The rigid-flexible printed board assembly 2 is arranged in an inner cavity formed between the electric plug shell and the sleeve, the rigid-flexible printed board assembly 2 comprises rigid printed boards 21 arranged at intervals in the front and back direction and flexible printed boards 22 electrically connected with adjacent rigid printed boards, the rigid printed boards are fixed together through a support piece 23, the support piece 23 comprises a first support piece 231 and a second support piece 232, and the first support piece and the second support piece are easy-to-weld parts; the first support 231 penetrates all the rigid printed boards 21 in the front-rear direction, and is welded to the rigid printed boards, thereby fixing the multilayer rigid printed boards in series. Preferably, the first supporting pieces are arranged in plurality and distributed along the circumferential direction, so that the structural strength of the rigid-flexible printed board assembly is improved; the first supporting member 231 is a cylindrical structural member with steps, the second supporting member 232 is a cylindrical structure, and the first supporting member sequentially comprises a first small-diameter section 2311, a supporting section 2312, a sleeving section 2313 and a second small-diameter section 2314 from back to front, first, the diameter of the second small-diameter section is the same, the diameter of the sleeving section is smaller than that of the supporting section and larger than that of the second small-diameter section, the sleeving end is sleeved in the second supporting piece, three rigid printed boards are arranged in the embodiment, the first small-diameter section is penetrated in the rigid printed board at the rear end and welded with the rigid printed board, the supporting section is supported between the rigid printed board at the rear end and the middle rigid printed board, the step is used for limiting the axial installation of the rigid board, the sleeving section is located between the middle rigid printed board and the front end rigid printed board and sleeved inside the second supporting piece, the second supporting piece is supported between the front rigid printed board and the middle rigid printed board, and the second small-diameter section penetrates out of the front end rigid printed board and is welded and fixed with the front end rigid printed board. In this embodiment, the external diameter of second support piece and the biggest external diameter (supporting section) of first support piece are 1.7mm, and this greatly reduced the occupation space of connecting in series fixed rigid-flexible rigid printed board, and the repairability improves. In other embodiments, if more rigid printed boards are provided, for example, four rigid printed boards are provided, each first supporting member is matched with two second supporting members, the sleeving section is sleeved in each second supporting member, that is, the length of the sleeving section is extended, the first small-diameter section is welded with the rear-end rigid board, the second small-diameter section is welded with the front-end rigid board, the second supporting member is supported between adjacent rigid printed boards which are not at the rear end, and the like, so that the supporting members can be matched with and fixed by the more rigid printed boards.

The jack 24 which is in adaptive plug connection with the electric plug pin is welded on the rigid printed board at the front end in the rigid-flexible printed board assembly, so that the electrical connection between the rigid-flexible printed board assembly 2 and the electric plug 1 is realized; the jack 24 is preferably a wire spring hole structure with a pin 241 at its rear end that plugs into the rigid printed board. A module support frame 25 is arranged at the rear end of the rigid printed board at the rear end, the module support frame is of a U-shaped plate structure and comprises a mounting portion 251 used for mounting the optical module 10 and supporting portions 252 symmetrically arranged on two sides of the mounting portion, the mounting portion 251 is arranged in parallel with the rigid printed board, the supporting portions 252 are arranged perpendicular to the rigid printed board, each supporting portion is bent towards the radial direction and extends outwards to form a fixing portion 253, and the fixing portion is used for mounting the module support frame at the rear end of the rigid printed board through a bolt 2532; specifically, the supporting block 27 is arranged at the front end of the rigid printed board, an internal thread hole is formed in the supporting block, a bolt 2532 penetrates through the rigid printed board and then is in threaded connection with the supporting block to fix the module supporting frame, a boss 271 is arranged at the rear end of the supporting block 27, and the rigid printed board at the rear end is provided with a guide hole 211 matched with the boss, so that the internal thread hole is just aligned with a bolt hole in the rigid printed board after the supporting block is buckled on the rigid printed board, and therefore assembly is facilitated; the fixing portion 253 is provided with a positioning key 2531 protruding outward in the radial direction. An installation space for accommodating the optical module 10 is formed between the module support frame and the rigid printed board at the rear end, a clamping groove 2533 for axially positioning the optical module is formed in the installation portion 253, and the clamping groove 2533 is provided with an opening 2534 for radially embedding the optical module 10 into the clamping groove, namely, the clamping groove is communicated with the outer peripheral surface of the installation portion board, so that the installation efficiency of the optical module can be effectively improved. The optical module 10 includes a laser 101 and a detector 102, and the laser and the detector are both provided with flanges 103 in axial stop fit with corresponding card slots. The laser and the detector are both connected with the rigid printed board 21 through the flexible board 104, so that the stress problem of welding pins of the laser and the detector is avoided, and the rear end light surfaces of the laser and the detector are kept consistent in the axial direction, namely the rear ends of the optical modules and the surfaces matched with the optical fiber contact pins are located on the same radial surface, and when the optical fiber contact pins are oppositely inserted with the corresponding optical modules, the compression amount of springs of the optical fiber contact pins is ensured to be consistent, so that the optical connection state is more stable. The rear end of the module support frame is provided with a connecting cover plate 26 to realize radial fixation of the laser and the detector, the connecting cover plate 26 is provided with a radial positioning through hole 261 for corresponding penetration of each optical module, and the connecting cover plate is fixed on the mounting part 253 of the module support frame through a screw 263.

The rear end face of the electric plug shell 11 is provided with a positioning key groove 112 matched with the positioning key 2531, when the rigid-flexible printed board assembly is installed, the positioning key is aligned with the positioning key groove, then the rigid-flexible printed board assembly is buckled into the rear end of the electric plug shell, the positioning key and the positioning key groove are in stop fit in the axial direction to achieve axial installation limiting of the rigid-flexible printed board assembly, the positioning key and the positioning key groove are in stop fit in the radial direction to achieve radial rotation prevention of the rigid-flexible printed board assembly, and at the moment, the electric contact pin is connected with the jack 24 in an inserting mode. Preferably, the radial width of two navigation keys is different, two navigation keys are different in size, and correspondingly, the groove width of positioning key groove and navigation key size are designed to be mutually adapted, and this can play the mistake proofing dress of rigid-flexible printed board subassembly. After the sleeve is installed in place, the front end of the sleeve 11 is in stop fit with the fixing portion 253 in the axial direction, so that the rigid-flexible printed board assembly 2 is axially positioned; preferably, the sleeve 31 front end still protruding be equipped with the auxiliary key 312 of locating the keyway matching, the auxiliary key gets into corresponding locating the keyway and with locating key butt after the sleeve is installed in place to realize the further axial fixity of rigid-flexible printed board subassembly. The connection cover plate 26 is provided with a guide hole 262, the pin mounting plate 4 is provided with a guide column 41, and the guide column is matched with the guide hole to realize the error-proofing insertion of the optical fiber pin, the laser and the detector; in the embodiment, two guide holes are arranged, and a pair of asymmetric through holes are formed in the two guide holes. The length that the guide post protrudes in contact pin installation department front end face is greater than the fiber optic inserting needle to make the guide post cooperate with the bullport direction in advance at the installation of guide optical cable subassembly, realize the accurate grafting of fiber optic inserting needle and corresponding optical module, avoid leading to fiber optic inserting needle front end atress to damage when the misloading.

Preferably, the rigid printed board 2 is further provided with a relief hole 28 for passing the low-voltage signal line and the power line, so that the internal space of the connector is fully utilized and the volume of the connector is reduced. Preferably, referring to fig. 14, a dust cap 113 is further connected to the electrical plug housing 11 via a connection cord, and covers the electrical plug tip when the active connector is not in use, and seals the electrical plug tip port.

When the active connector is assembled, the rigid-flexible printed board assembly 2 is firstly buckled into the rear end of the electric plug 1, the positioning key is matched with the positioning key groove to carry out radial rotation stopping and axial front end limiting on the rigid-flexible printed board assembly, and the electric plug pin is mutually inserted and matched with the jack; and then screwing the optical cable assembly and the electric plug, aligning the convex key with the groove, clamping the sleeve, rotating the connecting nut, enabling the convex key to enter the groove until the front end of the sleeve abuts against the module support frame to be regarded as that the optical cable assembly is screwed in place, realizing axial positioning of the rigid-flexible printed board assembly at the moment, and correspondingly contacting and conducting the optical fiber contact pin and the optical module.

In this embodiment, the optical modules are two lasers and two detectors, so as to implement transmission and reception of optical signals. In addition, in other embodiments, the support member may also be a cylindrical structure having an inner hole for a bolt to pass through, and the bolt passes through the rigid printed board and the support member in the front-back direction and tightens and fixes the printed board and the support frame together; the number of the rigid printed boards is at least two. Or, the first supporting piece does not comprise a supporting section, the supporting section is also set to be a sleeved end, and therefore the second supporting piece needs to be sleeved between the rear-end rigid printed board and the middle rigid printed board, at the moment, the first supporting piece penetrates through all the rigid boards, and the second supporting piece is welded between any two adjacent rigid printed boards, so that the secondary welding and reinforcing effects are achieved.

The rigid-flexible printed board assembly in the embodiment of the present invention, i.e., the embodiment of the active connector described above, is not described herein again.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the present invention without departing from the scope of the present invention, and still fall within the scope of the present invention.

Claims

1. The utility model provides an active connector, includes electric plug, rigid-flexible printed board subassembly and optical cable subassembly, the electric plug includes the electric plug casing and locates the electric contact pin in the electric plug casing, its characterized in that: the optical cable assembly comprises a sleeve extending along the front-back direction, a connecting nut matched with external threads arranged on the periphery of an electrical plug shell to assemble the optical cable assembly and an electrical plug is arranged at the front end of the sleeve, a convex key is arranged at the front end of the sleeve, a groove matched with the convex key is arranged at the rear end of the electrical plug shell to enable the sleeve to move forwards along the axial direction in the screwing process of the connecting nut, a jack is arranged at the front end of the rigid-flexible printed board assembly, the rigid-flexible printed board assembly is installed at the rear end of the electrical plug shell and is abutted against the front end of the sleeve to realize axial positioning after the optical cable assembly is screwed in place, and the jack is in plug-in fit with an electrical plug pin to realize conductive connection of the electrical plug and the rigid-flexible printed board assembly; the rigid-flexible printed board assembly comprises rigid printed boards and flexible printed boards, wherein the rigid printed boards are arranged at intervals in the front and back, the flexible printed boards enable the rigid printed boards to be electrically connected, and the rigid printed boards are fixed together through a support; the jack is arranged on the rigid printed board at the front end, the module support frame is arranged on the rigid printed board at the rear end, the optical module is arranged on the module support frame, and the optical module is electrically connected with the rigid printed board through the flexible board; the module support frame comprises a mounting portion and supporting portions symmetrically arranged on two sides of the mounting portion, the supporting portions are bent towards the radial direction to form fixing portions, the fixing portions are fixedly connected with the rigid printed board, a space for accommodating the optical module is formed between the module support frame and the rigid printed board, each fixing portion is convexly provided with a positioning key, a positioning key groove is formed in the rear end of the electric plug shell, and when the rigid-flexible printed board assembly is buckled at the rear end of the electric plug shell, the positioning keys and the positioning key grooves are axially in stop fit to achieve axial forward positioning and radial rotation stopping of the rigid-flexible printed board assembly.

2. An active connector according to claim 1, wherein: the module support frame is U-shaped.

3. An active connector according to claim 1, wherein: the optical module comprises a plurality of lasers and detectors, and the rear end light surfaces of the lasers and the detectors are axially located on the same diameter surface.

4. An active connector according to claim 3, wherein: an optical fiber contact pin is fixedly arranged in the sleeve through a contact pin mounting plate, the rear end of the optical fiber contact pin is connected with an optical fiber in the optical cable, and the front end of the optical fiber contact pin is correspondingly contacted and conducted with the rear end smooth surfaces of the laser and the detector.

5. An active connector according to claim 3, wherein: the mounting portion is provided with a clamping groove for mounting the optical module, and the clamping groove is provided with an opening for radially embedding the optical module.

6. An active connector according to claim 5, wherein: and the rear end of the module mounting frame is provided with a connecting cover plate, and the connecting cover plate is provided with a radial positioning through hole for the light module to penetrate through.

7. An active connector according to claim 1, wherein: the sizes of the two positioning keys are different so as to realize the wrong installation prevention of the rigid-flexible printed board assembly.

8. An active connector according to claim 1, wherein: the supporting piece comprises a first supporting piece and a second supporting piece, the first supporting piece penetrates through all the rigid printed boards in the front-back direction and is welded with all the rigid printed boards, the second supporting piece is sleeved outside the first supporting piece, and the second supporting piece is abutted between the adjacent rigid printed boards.

9. An active connector according to claim 6, wherein: the connecting cover plate is provided with a guide hole, and the contact pin mounting plate is provided with a guide column which is matched with the guide hole in an axial guide mode.

10. Rigid-flexible printed board subassembly, its characterized in that: the rigid-flexible printed board assembly of any one of claims 1 to 9 comprising the active connector.