Anti-electromagnetic interference shielding type optical fiber connector structure and manufacturing method

Abstract

The invention discloses an anti-electromagnetic interference shielding type optical fiber connector structure and a manufacturing method, and belongs to the technical field of optical fiber connectors. The optical fiber connector structure comprises a shielding conductive shell, and the two ends of the shielding conductive shell are connected with a first connecting piece and a locking assembly respectively; the end, away from the shielding conductive shell, of the first connecting piece is fixedly provided with an annular conductive contact piece, a bearing inner core base is coaxially arranged in the shielding conductive shell, the bearing inner core base and the shielding conductive shell are connected through a compensation assembly, and the bearing inner core base is composed of a structure with two large cylinders at the two ends and a small cylinder in the middle. And an optical fiber insertion core assembly is coaxially arranged in the bearing inner core seat. By adopting the structure and the manufacturing method, the electromagnetic absorption layer is arranged between the outer wall of the bearing inner core seat and the shielding conductive shell, and high-frequency electromagnetic waves entering the shell are absorbed and attenuated by using a ferrite or carbon nanotube composite wave-absorbing material, so that electromagnetic reflection and secondary interference are reduced, and the overall anti-interference performance is improved.

Description

Technical Field

[0001] This invention relates to the field of fiber optic connector technology, and in particular to a shielded fiber optic connector structure and manufacturing method that is resistant to electromagnetic interference. Background Technology

[0002] Fiber optic connectors are essential components in optical communication systems, enabling rapid connection and disconnection of optical fibers. They are widely used in communication networks, data centers, industrial control, and power systems. Their primary function is to achieve low-loss optical signal transmission between two optical fibers while ensuring the stability and reliability of the connection structure.

[0003] In power systems, rail transportation, industrial automation equipment, and high-power electronic equipment environments, strong electromagnetic interference is common. High-frequency electromagnetic waves and electromagnetic pulses can easily enter the connector through equipment gaps or discontinuities in cable shielding, affecting the fiber optic communication module. Although the optical signal itself is not affected by electromagnetic interference, fiber optic connectors typically contain metal structural components, photoelectric conversion devices, and sensing elements. When electromagnetic interference enters through the connector housing or cable shielding layer, it can easily create parasitic currents or electromagnetic coupling in the connection structure, thus affecting the stable operation of the equipment.

[0004] Existing fiber optic connectors typically achieve basic electromagnetic shielding through a metal housing, but in practical applications, the following problems still exist: there are assembly gaps or tolerances between the internal components of the connector and the metal housing. When the connector is used in a plugging, unplugging, or vibration environment, it is prone to micro-movements, resulting in unstable shielding contact and forming an electromagnetic leakage path. Summary of the Invention

[0005] The purpose of this invention is to provide a shielded fiber optic connector structure and manufacturing method that resists electromagnetic interference, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a shielded fiber optic connector structure resistant to electromagnetic interference, comprising a shielded conductive shell, a first connector and a locking assembly connected to both ends of the shielded conductive shell, an annular conductive contact fixedly installed at the end of the first connector away from the shielded conductive shell, a bearing inner core seat coaxially disposed inside the shielded conductive shell, the bearing inner core seat and the shielded conductive shell being connected by a compensation assembly, the bearing inner core seat being composed of a structure of large cylinders at both ends and a small cylinder in the middle, and a fiber optic ferrule assembly coaxially disposed inside the bearing inner core seat.

[0007] Preferably, the small cylinder is provided with an annular groove.

[0008] Preferably, the fiber optic ferrule assembly includes a ferrule body, a ferrule retaining sleeve, and elastic limiting members. The ferrule body is disposed in the axial region of the inner core seat, and one end of the ferrule body extends out of the end face of the first connector to form a mating end. The ferrule retaining sleeve is sleeved on the other end of the ferrule body. Several elastic limiting members are provided, and the elastic limiting members are fixedly disposed at equal intervals between the ferrule retaining sleeve and the inner core seat.

[0009] Preferably, the insert body is a cylindrical ceramic insert.

[0010] Preferably, the compensation component includes an annular conductive floating element and elastic conductive contacts. The annular conductive floating element is sleeved in an annular groove, and the axial length of the annular groove is greater than the axial length of the annular conductive floating element. The elastic conductive contacts are evenly distributed around the outer periphery of the annular conductive floating element.

[0011] Preferably, the elastic conductive contact is configured as an arc-shaped spring structure.

[0012] Preferably, the annular conductive floating component is provided with a number of grooves corresponding to the elastic conductive contact piece. The size of the groove is larger than the size of the end face of the elastic conductive contact piece. One end of the elastic conductive contact piece is fixedly connected to the inner wall of the shielding conductive shell, and the other end is pressed against the groove.

[0013] Preferably, an electromagnetic absorption layer is fixedly disposed between the outer wall of the bearing inner core seat and the inner wall of the shielding conductive shell, and is located on one side of the compensation component.

[0014] Preferably, the locking assembly includes a voltage-conducting sleeve, a clamping sleeve, and a locking screw sleeve. One end of the voltage-conducting sleeve is disposed on the outer periphery of the rear end of the shielding conductive housing, and the clamping sleeve is disposed on the other end of the voltage-conducting sleeve. It is shaped like a frustum and has anti-slip teeth on its inner wall. The locking screw sleeve has an internal thread on its inner wall, which mates with the external thread on the outer side of the clamping sleeve.

[0015] The present invention also provides a method for manufacturing a shielded fiber optic connector structure resistant to electromagnetic interference, comprising the following steps: S1. A hollow cylindrical shielding conductive shell is prepared by CNC turning or precision machining, and an installation space is reserved on the inner wall of the shell for installing compensation components and electromagnetic absorption layer; S2. Prepare the load-bearing inner core seat by precision injection molding or ceramic sintering, and process an annular groove structure on its outer surface; S3. Install the annular conductive floating component into the annular groove of the bearing inner core seat, and fix several elastic conductive contact pieces on the inner wall of the shielding conductive shell so that the ends of the elastic conductive contact pieces and the groove of the annular conductive floating component form a sliding conductive contact structure. S4. Install an annular electromagnetic absorption layer between the outer wall of the bearing inner core seat and the inner wall of the shielding conductive shell, and fix it on one side of the compensation component. S5. Install the fiber optic ferrule assembly into the center hole of the bearing inner core seat, and position and axially compensate the ferrule body by means of the ferrule fixing sleeve and elastic limiting component. S6. Install a voltage-conducting sleeve, a clamping sleeve and a locking screw sleeve in sequence at the rear end of the shielding conductive shell to form a locking structure for clamping the optical cable shielding layer. S7. Insert the optical fiber from the tail of the connector and connect it to the fixing hole inside the ferrule body. Then tighten the locking screw to press the clamping sleeve against the braided shielding layer of the optical cable, thereby completing the overall assembly of the optical fiber connector.

[0016] Therefore, the present invention, employing the above-described shielded fiber optic connector structure and manufacturing method for resisting electromagnetic interference, has the following beneficial effects: (1) By using the ring-shaped conductive floating component and the elastic conductive contact to form a sliding conductive contact structure, the ring-shaped conductive floating component can generate a small axial float, thereby maintaining a stable conductive state under connector assembly tolerance, insertion and removal micro-motion or vibration environment, avoiding the formation of shielding breakpoints and improving electromagnetic shielding continuity.

[0017] (2) The inner core is made of insulating material and is connected to the shielding shell through a compensation component. This allows the internal fiber optic ferrule assembly to reduce the direct impact of shell vibration on the ferrule while ensuring coaxial accuracy, thereby improving the stability of the fiber optic connection and the insertion / removal life.

[0018] (3) An electromagnetic absorption layer is set between the outer wall of the inner core seat and the shielded conductive shell. Ferrite or carbon nanotube composite absorbing materials are used to absorb and attenuate the high-frequency electromagnetic waves entering the shell, thereby reducing electromagnetic reflection and secondary interference and improving the overall anti-interference performance.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a shielded fiber optic connector structure that resists electromagnetic interference, according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a shielded fiber optic connector structure that resists electromagnetic interference, according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the annular conductive floating component according to an embodiment of the present invention; Figure Labels 1. Shielded conductive shell; 2. First connector; 3. Locking assembly; 31. Conductive sleeve; 32. Compression sleeve; 33. Locking screw sleeve; 4. Annular conductive contact; 5. Bearing inner core seat; 6. Compensation assembly; 61. Annular conductive floating component; 62. Elastic conductive contact piece; 7. Annular groove; 8. Fiber optic ferrule assembly; 81. Ferrule body; 82. Ferrule fixing sleeve; 83. Elastic limiting component; 9. Groove; 10. Electromagnetic absorption layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] Example like Figures 1-3 As shown, the present invention provides a shielded fiber optic connector structure for resisting electromagnetic interference, including a shielded conductive shell 1, which is a hollow cylindrical shell structure. The shielded conductive shell 1 is connected to a first connector 2 and a locking assembly 3 at both ends. An annular conductive contact 4 is fixedly installed at the end of the first connector 2 away from the shielded conductive shell 1.

[0024] A load-bearing inner core seat 5 is coaxially disposed inside the shielded conductive housing 1, and the load-bearing inner core seat 5 and the shielded conductive housing 1 are connected by a compensation component 6. The load-bearing inner core seat 5 is made of insulating material and is configured as a stepped cylindrical sleeve structure, that is, the load-bearing inner core seat 5 consists of a structure with large cylinders at both ends and a small cylinder in the middle, and annular grooves 7 are provided on the cylinders. The insulating material is preferably PEEK (polyetheretherketone) or zirconium oxide ceramic, which has insulation performance, mechanical strength and high temperature resistance, and can effectively isolate the electrical interference between the internal core assembly and the external shielding housing, while ensuring load-bearing stability.

[0025] An optical fiber ferrule assembly 8 is coaxially arranged inside the inner core seat 5. The optical fiber ferrule assembly 8 includes a ferrule body 81, a ferrule retaining sleeve 82, and elastic limiting members 83. The ferrule body 81 is a cylindrical ceramic ferrule. The ferrule body 81 is located in the axial region of the inner core seat 5, and one end of the ferrule body 81 extends out of the end face of the first connector 2 to form a mating end. The ferrule retaining sleeve 82 is fitted onto the other end of the ferrule body 81 to limit the radial sway of the ferrule (optical fiber). Several elastic limiting members 83 are provided and fixedly arranged between the ferrule retaining sleeve 82 and the inner core seat 5 to provide axial spring compensation. The elastic limiting members 83 are springs. After the optical fiber passes through the tail section, it connects to a predetermined fixing hole inside the ferrule body 81 to form an optical signal transmission path.

[0026] The compensation component 6 includes an annular conductive floating element 61 and elastic conductive contacts 62. The annular conductive floating element 61 is fitted inside an annular groove 7, and the axial length of the annular groove 7 is greater than the axial length of the annular conductive floating element 61 by a difference of 1.0-2.0 mm, allowing the annular conductive floating element 61 to float slightly within ±0.5 mm along the axial direction. The elastic conductive contacts 62 are evenly spaced around the outer periphery of the annular conductive floating element 61 and are configured as arc-shaped springs. The annular conductive floating element 61 has several grooves 9 corresponding to the elastic conductive contacts 62. One end of each elastic conductive contact 62 is fixedly connected to the inner wall of the shielded conductive housing 1, and the other end is pressed against the groove 9. The size of the groove 9 is larger than the size of the end face of the elastic conductive contact 62, allowing the elastic conductive contact 62 to slide within the groove 9, achieving sliding conductive contact with the shielded conductive housing 1. The annular structure of the annular conductive floating element 61 ensures continuous circumferential conduction, eliminating shielding breaks caused by assembly tolerances and insertion / removal micro-movements.

[0027] An electromagnetic absorption layer 10 is fixedly disposed between the outer wall of the inner core seat 5 and the inner wall of the shielded conductive shell 1, and is located on one side of the axial direction of the compensation component 6. The electromagnetic absorption layer 10 is preferably an annular thin layer structure, used to absorb high-frequency electromagnetic waves entering the interior of the shielded conductive shell 1. The electromagnetic absorption layer 10 is made of ferrite or carbon nanotube composite absorbing material.

[0028] The locking assembly 3 includes a voltage-conducting sleeve 31, a clamping sleeve 32, and a locking screw sleeve 33. One end of the voltage-conducting sleeve 31 is located on the outer periphery of the rear end of the shielding conductive housing 1. The clamping sleeve 32 is located on the other end of the voltage-conducting sleeve 31. It is truncated cone-shaped, with a larger front and a smaller rear, and is made of stainless steel. The inner wall is provided with anti-slip teeth, which are used to clamp the braided shielding layer on the outside of the optical cable. The inner wall of the locking screw sleeve 33 is provided with internal threads, which cooperate with the external threads provided on the outside of the clamping sleeve 32. The axial clamping force is generated by tightening the threads, which drives the truncated cone-shaped clamping sleeve 32 to retract inward, thereby achieving uniform circumferential clamping of the braided shielding layer of the optical cable, forming a rear grounding path and a complete shielding closed loop.

[0029] Working Principle: When the fiber optic connector is connected to the mating connector, the ferrule body 81 in the fiber optic ferrule assembly 8 extends through the end of the first connector 2 and aligns with the ferrule at the other end, achieving low-loss transmission of optical signals. During the connection process, the optical signal enters the fixed hole inside the ferrule body 81 through the optical fiber and is transmitted along the fiber core to the other end device, completing the optical communication connection. Simultaneously, the shielding conductive shell 1 outside the connector forms an integral metal shielding structure. When external electromagnetic interference reaches the connector, it is first reflected and isolated by the shielding conductive shell 1, thus blocking most electromagnetic waves from entering the connector. When some high-frequency electromagnetic interference enters the shell through the connection gap or structural gap, the electromagnetic absorption layer 10, located between the outer wall of the inner core seat 5 and the shielding conductive shell 1, absorbs and attenuates the electromagnetic waves, thereby reducing internal electromagnetic reflection and interference propagation. The annular conductive floating element 61 maintains conductive contact with the shielding conductive shell 1 through the elastic conductive contact 62, and can also float slightly along the axial direction. When the connector experiences slight displacement during insertion, removal, or vibration, the elastic conductive contact 62 can slide within the groove 9 of the annular conductive floating member 61, thus maintaining stable conductive contact and ensuring the continuity of electromagnetic shielding inside the shielded conductive housing 1. During optical cable installation, the end of the optical cable passes through the locking assembly 3 into the connector. The braided shielding layer on the outside of the optical cable is pressed by the compression sleeve 32, and the axial clamping force is generated by tightening the threads of the locking screw sleeve 33, causing the compression sleeve 32 to radially contract and tightly press against the optical cable shielding layer, thereby reliably connecting the optical cable shielding layer to the shielded conductive housing 1 and forming a stable grounding path.

[0030] The present invention also provides a method for manufacturing a shielded fiber optic connector structure resistant to electromagnetic interference, comprising the following steps: S1. A hollow cylindrical shielding conductive shell is prepared by CNC turning or precision machining, and an installation space is reserved on the inner wall of the shell for installing compensation components and electromagnetic absorption layer; S2. Prepare the load-bearing inner core seat by precision injection molding or ceramic sintering, and process an annular groove structure on its outer surface; S3. Install the annular conductive floating component into the annular groove of the bearing inner core seat, and fix several elastic conductive contact pieces on the inner wall of the shielding conductive shell so that the ends of the elastic conductive contact pieces and the groove of the annular conductive floating component form a sliding conductive contact structure. S4. Install an annular electromagnetic absorption layer between the outer wall of the bearing inner core seat and the inner wall of the shielding conductive shell, and fix it on one side of the compensation component. S5. Install the fiber optic ferrule assembly into the center hole of the bearing inner core seat, and position and axially compensate the ferrule body by means of the ferrule fixing sleeve and elastic limiting component. S6. Install a voltage-conducting sleeve, a clamping sleeve and a locking screw sleeve in sequence at the rear end of the shielding conductive shell to form a locking structure for clamping the optical cable shielding layer. S7. Insert the optical fiber from the tail of the connector and connect it to the fixing hole inside the ferrule body. Then tighten the locking screw to press the clamping sleeve against the braided shielding layer of the optical cable, thereby completing the overall assembly of the optical fiber connector.

[0031] Therefore, the present invention adopts the above-mentioned electromagnetic interference-resistant shielded fiber optic connector structure and manufacturing method. Through the cooperation of the conductive sleeve, the clamping sleeve and the locking screw in the locking assembly, the braided shielding layer of the optical cable can be uniformly clamped by the frustoconical clamping sleeve to achieve large-area conductive contact. And through the shielded conductive shell, a stable grounding path is formed, thereby constructing a complete shielded grounding closed-loop structure.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A shielded fiber optic connector structure resistant to electromagnetic interference, characterized in that: The device includes a shielded conductive shell, with a first connector and a locking assembly connected to both ends of the shielded conductive shell. An annular conductive contact is fixedly installed at the end of the first connector away from the shielded conductive shell. A load-bearing inner core seat is coaxially arranged inside the shielded conductive shell. The load-bearing inner core seat and the shielded conductive shell are connected by a compensation assembly. The load-bearing inner core seat is composed of a structure with large cylinders at both ends and a small cylinder in the middle. An optical fiber ferrule assembly is coaxially arranged inside the load-bearing inner core seat.

2. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 1, characterized in that: The small cylinder has an annular groove.

3. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 1, characterized in that: The fiber optic ferrule assembly includes a ferrule body, a ferrule retaining sleeve, and elastic limiting members. The ferrule body is located in the axial region of the inner core seat, and one end of the ferrule body extends out of the end face of the first connector to form a mating end. The ferrule retaining sleeve is fitted on the other end of the ferrule body. Several elastic limiting members are provided and are fixedly arranged at equal intervals between the ferrule retaining sleeve and the inner core seat.

4. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 3, characterized in that: The insert body is a cylindrical ceramic insert.

5. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 2, characterized in that: The compensation component includes an annular conductive floating element and elastic conductive contacts. The annular conductive floating element is fitted inside an annular groove, and the axial length of the annular groove is greater than the axial length of the annular conductive floating element. The elastic conductive contacts are evenly distributed around the outer periphery of the annular conductive floating element.

6. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 5, characterized in that: The elastic conductive contact is designed as an arc-shaped spring structure.

7. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 6, characterized in that: The annular conductive floating component has several grooves corresponding to the elastic conductive contact. The size of the grooves is larger than the size of the end face of the elastic conductive contact. One end of the elastic conductive contact is fixedly connected to the inner wall of the shielded conductive shell, and the other end is pressed against the groove.

8. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 1, characterized in that: An electromagnetic absorption layer is fixedly disposed between the outer wall of the bearing inner core seat and the inner wall of the shielding conductive shell, and is located on one side of the compensation component.

9. The electromagnetic interference-resistant shielded fiber optic connector structure according to claim 1, characterized in that: The locking assembly includes a voltage-conducting sleeve, a clamping sleeve, and a locking screw sleeve. One end of the voltage-conducting sleeve is located on the outer periphery of the rear end of the shielded conductive housing. The clamping sleeve is located at the other end of the voltage-conducting sleeve, is truncated cone-shaped, and has anti-slip teeth on its inner wall. The locking screw sleeve has an internal thread on its inner wall, which mates with the external thread on the outer side of the clamping sleeve.

10. A manufacturing method for manufacturing an electromagnetic interference-resistant shielded fiber optic connector structure as described in any one of claims 1-9, comprising the following steps: S1. A hollow cylindrical shielding conductive shell is prepared by CNC turning or precision machining, and an installation space is reserved on the inner wall of the shell for installing compensation components and electromagnetic absorption layer; S2. Prepare the load-bearing inner core seat by precision injection molding or ceramic sintering, and process an annular groove structure on its outer surface; S3. Install the annular conductive floating component into the annular groove of the bearing inner core seat, and fix several elastic conductive contact pieces on the inner wall of the shielding conductive shell so that the ends of the elastic conductive contact pieces and the groove of the annular conductive floating component form a sliding conductive contact structure. S4. Install an annular electromagnetic absorption layer between the outer wall of the bearing inner core seat and the inner wall of the shielding conductive shell, and fix it on one side of the compensation component. S5. Install the fiber optic ferrule assembly into the center hole of the bearing inner core seat, and position and axially compensate the ferrule body by means of the ferrule fixing sleeve and elastic limiting component. S6. Install a voltage-conducting sleeve, a clamping sleeve and a locking screw sleeve in sequence at the rear end of the shielding conductive shell to form a locking structure for clamping the optical cable shielding layer. S7. Insert the optical fiber from the tail of the connector and connect it to the fixing hole inside the ferrule body. Then tighten the locking screw to press the clamping sleeve against the braided shielding layer of the optical cable, thereby completing the overall assembly of the optical fiber connector.

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