LC duplex fiber optic connector

Abstract

The utility model discloses a kind of LC double-core fiber connector, it is related to optical fiber communication technical field, including connector main body, tail cover and locking mechanism, connector main body includes main body part and the two insertion parts formed in one end of main body part, insertion part is used to insert fiber optic adapter, the opposite two outer side walls of main body part are respectively equipped with first insertion hole and second insertion hole;Tail cover is slidably sleeved in the end of main body part away from insertion part;Locking mechanism has locking portion, insertion part and transmission part, transmission part is drivingly connected with tail cover, insertion part can be inserted in first insertion hole or second insertion hole, locking portion is used to insert fiber optic adapter and is connected with fiber optic adapter;Wherein, when tail cover slides away from insertion part, tail cover drives transmission part to rotate around insertion part, to make locking portion and fiber optic adapter separate. The LC double-core fiber connector of the utility model not only improves the integrity and structural strength of LC double-core fiber connector, but also retains the function of changing polarity.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber communication technology, and in particular to an LC dual-core optical fiber connector. Background Technology

[0002] Fiber optic connectors are used in conjunction with fiber optic adapters to achieve fiber optic interconnection and are widely used in local area networks (LANs) and data centers. Fiber optic connectors connect to the ends of optical fibers, while fiber optic adapters have jacks at both ends for the fiber optic connector to insert, thus enabling the internal optical path to be aligned.

[0003] A dual-core fiber optic connector, also known as a duplex fiber optic connector, contains two optical fibers, one for data transmission and the other for data reception (upstream and downstream). The compatible fiber optic adapter also has two jacks: an upstream jack and a downstream jack. For example... Figure 11 As shown, duplex fiber optic connectors can be manufactured in either Type A or Type B polarity. Type A is a straight-through connector, where fiber 1 (marked F1) is connected to fiber 2 at the other end; this is typically deployed in FTTH (Fiber to the Home) networks. Type B is a crossover connector, where fiber 1 is routed to fiber 2 (marked F2) on the other side; this is typically deployed in full-duplex networks to connect the transmitting and receiving ports. Traditional LC dual-core fiber optic connectors use a multi-part splicing design. The part inserted into the fiber optic adapter and the part remaining outside the adapter are spliced ​​together and can rotate to achieve polarity switching. During long-term use or frequent insertion and removal, the splice is prone to loosening, leading to decreased fiber alignment accuracy, increased optical signal transmission loss, and even connection interruption. Utility Model Content

[0004] The main purpose of this invention is to propose an LC dual-core fiber optic connector, which aims to improve the overall integrity and structural strength of the LC dual-core fiber optic connector while retaining the pole-switching function.

[0005] To achieve the above objectives, the LC dual-core fiber optic connector proposed in this utility model includes a connector body, a tail sleeve, and a locking mechanism. The connector body includes a main body portion and two insertion portions formed at one end of the main body portion. The insertion portions are used to insert a fiber optic adapter. The two opposite outer side walls of the main body portion are respectively provided with a first insertion hole and a second insertion hole. The tail sleeve is slidably sleeved on the end of the main body portion away from the insertion portions. The locking mechanism has a locking portion, a insertion portion, and a transmission portion. The transmission portion is motive-connected to the tail sleeve. The insertion portion can be inserted into the first insertion hole or the second insertion hole. The locking portion is used to insert into the fiber optic adapter and engage with the fiber optic adapter. When the tail sleeve slides away from the insertion portions, the tail sleeve drives the transmission portion to rotate around the insertion portion, so that the locking portion disengages from the fiber optic adapter.

[0006] In one embodiment, the tail sleeve is provided with an unlocking ramp; the locking mechanism includes a support member and a lever arm, the support member having the insertion portion formed thereon, the lever arm having a locking portion and a transmission portion formed at both ends, the locking portion abutting against the insertion portion, the transmission portion being disposed opposite to the unlocking ramp, the support member being connected to the lever arm between the locking portion and the transmission portion, the locking portion having a locking protrusion for engaging with the fiber optic adapter; when the tail sleeve slides away from the insertion portion, the unlocking ramp slides against the transmission portion and pushes the transmission portion to rotate around the support member, so that the locking protrusion disengages from the fiber optic adapter.

[0007] In one embodiment, the tail sleeve is provided with a clearance hole, and the side wall of the clearance hole near the insertion part is formed with an unlocking slope, and the side wall of the clearance hole away from the insertion part is formed with a safety hole; the transmission part extends into the clearance hole, and the transmission part is formed with a safety protrusion, which extends into the safety hole; when the tail sleeve slides away from the insertion part, the safety protrusion disengages from the safety hole, and the unlocking slope slides against the transmission part.

[0008] In one embodiment, the sidewall of the safety hole is provided with an anti-detachment groove, and the side of the safety protrusion facing the opening of the avoidance hole is provided with an anti-detachment protrusion, which engages with the anti-detachment groove; when the tail sleeve slides away from the insertion part, the anti-detachment protrusion engages with the anti-detachment groove.

[0009] In one embodiment, the connector body includes an upper housing and a lower housing that are detachably connected to each other. A portion of the main body is disposed in the upper housing and another portion is disposed in the lower housing. A portion of the insertion portion is disposed in the upper housing and another portion is disposed in the lower housing. The upper housing and the lower housing enclose a fiber distribution cavity and two ferrule cavities. Both ferrule cavities are connected to one end of the fiber distribution cavity. A ferrule port communicating with the external space is formed on the side wall of the ferrule cavity away from the fiber distribution cavity. A fiber inlet communicating with the external space is formed on the side wall of the fiber distribution cavity away from the ferrule cavity. The two ferrule cavities are respectively located in the two insertion portions, and the fiber distribution cavity is located in the main body.

[0010] In one embodiment, the LC dual-core fiber optic connector further includes a ferrule assembly, which includes a ferrule body, a first heat-shrink tubing, and a spring. A portion of the ferrule body is disposed within the ferrule cavity, and another portion of the ferrule body extends into the ferrule port. The first heat-shrink tubing is sleeved on the end of the ferrule body away from the ferrule port, and the spring is sleeved on the outside of the first heat-shrink tubing and connects the ferrule body to the inner wall of the ferrule cavity.

[0011] In one embodiment, a guide member is provided in the fiber distribution cavity. The guide member gradually contracts along the direction from the ferrule cavity to the fiber inlet to form two guide slopes. The two guide slopes are respectively connected to the inner wall of one of the ferrule cavities.

[0012] In one embodiment, a first polarity marking portion and a second polarity marking portion are respectively provided on the two opposite outer side walls of the main body, and an observation window is also provided on the side of the tail sleeve facing away from the locking mechanism; the first polarity marking portion or the second polarity marking portion is exposed in the observation window.

[0013] In one embodiment, the LC dual-core fiber optic connector further includes a connecting tube and a second heat-shrink tubing; the connecting tube is inserted into the end of the main body away from the insertion portion, and the second heat-shrink tubing is sleeved on the end of the connecting tube away from the main body.

[0014] In one embodiment, the inner wall of the tail sleeve is provided with a travel limiting groove, and the outer wall of the main body is provided with a limiting protrusion, the limiting protrusion being limited within the travel limiting groove.

[0015] This utility model proposes an LC dual-core fiber optic connector comprising a connector body, a tail sleeve, and a locking mechanism. The connector body includes a main body portion and two insertion portions formed at one end of the main body portion. The insertion portions are used to insert fiber optic adapters. A first insertion hole and a second insertion hole are respectively provided on the opposite two outer side walls of the main body portion. The tail sleeve is slidably fitted onto the end of the main body portion away from the insertion portions. The locking mechanism has a locking portion, a insertion portion, and a transmission portion. The transmission portion is drively connected to the tail sleeve. The insertion portion can be inserted into either the first or second insertion hole. The locking portion is used to insert into and engage with the fiber optic adapter. When the tail sleeve slides away from the insertion portions, the tail sleeve drives the transmission portion to rotate around the insertion portion, thereby disengaging the locking portion from the fiber optic adapter. This utility model improves the integrity and structural strength of the fiber optic connector by forming an insertion portion and a main body portion on the connector body. The insertion portion is used to insert into the fiber optic adapter, while the main body portion remains outside the fiber optic adapter. Furthermore, the main body portion and the insertion portion are an integral structure, improving the integrity and structural strength of the fiber optic connector. Additionally, a first insertion hole and a second insertion hole are respectively provided on both sides of the main body portion, and the locking mechanism can select one of them for insertion, such as... Figure 12 As shown, when the locking mechanism is switched from one of the plug holes to the other, the positions of the left and right optical fibers are interchanged, thus achieving pole switching. Therefore, the LC dual-core fiber optic connector of this invention not only improves the overall integrity and structural strength of the LC dual-core fiber optic connector, but also retains the pole switching function. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a structural embodiment of the LC dual-core fiber optic connector provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the structure of the LC dual-core fiber optic connector from another perspective; Figure 3 for Figure 1 Top view of the LC dual-core fiber optic connector; Figure 4 for Figure 3 Cross-sectional view along line A-A'; Figure 5 for Figure 3 Cross-sectional view along line B-B'; Figure 6 for Figure 1 Exploded view of the LC dual-core fiber optic connector; Figure 7 for Figure 6 A schematic diagram of the locking mechanism; Figure 8 for Figure 1 Cross-sectional view of a medium-sized LC dual-core fiber optic connector; Figure 9 for Figure 6 Schematic diagram of the middle tail sleeve; Figure 10 for Figure 6 A schematic diagram of the structure of the connector body and ferrule assembly; Figure 11 A schematic diagram of the polarity of a full-duplex fiber optic connector; Figure 12 This is a schematic diagram of the LC dual-core fiber optic connector pole switching provided by this utility model.

[0018] Explanation of icon numbers: 100, LC dual-core fiber optic connector; 1. Connector body; 1a. First insertion hole; 1b. Second insertion hole; 11. Main body; 11a. Fiber splitting cavity; 11b. Fiber inlet; 111. Guide; 112. Guide slope; 113. First polarity marking; 114. Second polarity marking; 115. Limiting protrusion; 12. Insertion part; 12a. Ferrule cavity; 12b. Ferrule port; 13. Upper housing; 14. Lower housing; 2. Tail sleeve; 21. Unlocking ramp; 2a. Clearance hole; 2b. Safety hole; 2c. Anti-detachment groove; 2d. Travel limit groove; 2f. Observation window; 3. Locking mechanism; 31. Lever arm; 311. Locking part; 3111. Locking protrusion; 312. Transmission part; 3121. Safety protrusion; 3122. Anti-detachment protrusion; 32. Support member; 321. Insertion part; 4. Insert assembly; 41. Insert body; 42. First heat shrink tubing; 43. Spring; 51. Connecting tube; 52. Second heat shrink tubing.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. 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 embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This utility model proposes an LC dual-core fiber optic connector 100.

[0024] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment of this utility model, the LC dual-core fiber optic connector 100 includes a connector body 1, a tail sleeve 2, and a locking mechanism 3. The connector body 1 includes a main body portion 11 and two insertion portions 12 formed at one end of the main body portion 11. The insertion portions 12 are used to insert fiber optic adapters. The two opposite outer side walls of the main body portion 11 are respectively provided with a first insertion hole 1a and a second insertion hole 1b. The tail sleeve 2 is slidably sleeved on the end of the main body portion 11 away from the insertion portions 12. The locking mechanism 3 has a locking portion 311, a insertion portion 321, and a transmission portion 312. The transmission portion 312 is connected to the tail sleeve 2. The insertion portion 321 can be inserted into the first insertion hole 1a or the second insertion hole 1b. The locking portion 311 is used to insert the fiber optic adapter and engage with the fiber optic adapter. When the tail sleeve 2 slides away from the insertion portion 12, the tail sleeve 2 drives the transmission portion 312 to rotate around the insertion portion 321, so that the locking portion 311 disengages from the fiber optic adapter.

[0025] In this embodiment, the connector body 1 is the core of the entire device, integrally injection molded from high-strength PBT material. The body 11 and the two insertion parts 12 formed at one end are a seamless integrated structure—the insertion parts 12 are inserted into the fiber optic adapter, while the body 11 remains outside the fiber optic adapter. This integrated design completely eliminates the gaps of traditional splicing structures, significantly improving the integrity and structural strength of the fiber optic connector, effectively resisting the impact of frequent insertion and removal impacts and environmental temperature changes on the structure, and avoiding the problem of loosening after long-term use. The insertion parts 12 are symmetrically distributed side by side, and their outer diameter matches the inner diameter of the fiber optic adapter's socket. The body 11 has a first insertion hole 1a and a second insertion hole 1b on opposite outer side walls. The two holes can communicate with each other, and their diameters match the insertion part 321 of the locking mechanism 3. The locking mechanism 3 can switch between the first insertion hole 1a and the second insertion hole 1b, thereby realizing the pole-switching function.

[0026] The tail sleeve 2 is fitted onto the end of the main body 11 away from the insertion part 12. It can be made of elastic PVC material, which combines flexibility and anti-slip properties for easy gripping and operation. The inner wall of the tail sleeve 2 slides against the outer wall of the main body 11. The tail sleeve 2 can also slide axially along the main body 11 through the cooperation of the guide groove and the slide rail, restricting the tail sleeve 2 to move only along the axial direction of the main body 11 to prevent sliding, twisting and displacement. The end of the tail sleeve 2 away from the insertion part 12 is provided with a cable fixing hole and an elastic section. The elastic section plays a protective role and avoids the influence of cable pulling on the internal connection of the connector.

[0027] The locking mechanism 3 is an integrated elastic plastic component with dual functions of connection locking and pole switching. It includes a locking part 311, a plug-in part 321, and a transmission part 312. The inclined guide surface at the end of the locking part 311 facilitates insertion into the locking groove when the fiber optic adapter is inserted, and provides a stable holding force after engagement to prevent accidental dislodgement. The plug-in part 321 can be a cylindrical protrusion that is interference-fitted with the first or second plug-in hole 1b to ensure that the locking mechanism 3 does not rotate on its own when not in operation. The plug-in part 12 can also be an elastic buckle that is elastically engaged with the first or second plug-in hole 1b. The transmission part 312 is an extension that extends to contact the tail sleeve 2. When the tail sleeve 2 slides away from the plug-in part 12, it squeezes and pushes the transmission part 312 to rotate around the plug-in part 12, causing the locking part 311 to disengage from the locking groove of the fiber optic adapter, thus completing the unlocking operation. During the polarity switching operation, the insertion part 12 of the locking mechanism 3 is removed from one insertion hole, and then the insertion part 321 is switched and inserted into the insertion hole on the other side of the main body 11 to achieve polarity switching.

[0028] The integrated structural design of the main body 11 and the insertion part 12 fundamentally improves the overall integrity and structural strength of the LC dual-core fiber optic connector 100, avoiding the problem of decreased docking accuracy caused by loosening at the splicing point in traditional splicing designs, ensuring the positional accuracy of the insertion part 12, and reducing optical signal transmission loss caused by optical path docking misalignment; while the setting of the first insertion hole 1a and the second insertion hole 1b on both sides of the main body 11 allows the locking mechanism 3 to select one of the holes for insertion, such as Figure 12 As shown, when the locking mechanism 3 is switched from one plug hole to another, the positions of the two optical fibers on the left and right are swapped after the optical fiber adapter is inserted. This eliminates the need for a splicing and rotating structure while maintaining the pole-changing function, thus balancing structural stability and ease of operation. The transmission and cooperation design between the tail sleeve 2 and the locking mechanism 3 further simplifies and improves the unlocking operation, thereby enhancing the overall connection stability, ease of operation, and service life of the connector.

[0029] Further, please refer to Figures 2 to 5 , Figure 7 and Figure 10 In one embodiment of this utility model, the tail sleeve 2 is provided with an unlocking ramp 21; the locking mechanism 3 includes a support member 32 and a lever arm 31. An insertion part 12 is formed on the support member 32, and a locking part 311 and a transmission part 312 are formed at both ends of the lever arm 31. The locking part 311 abuts against the insertion part 12, and the transmission part 312 is disposed opposite to the unlocking ramp 21. The support member 32 is connected to the lever arm 31 between the locking part 311 and the transmission part 312. The locking part 311 is formed with a locking protrusion 3111 for engaging with the fiber optic adapter. When the tail sleeve 2 slides away from the insertion part 12, the unlocking ramp 21 slides against the transmission part 312 and pushes the transmission part 312 to rotate around the support member 32, so that the locking protrusion 3111 disengages from the fiber optic adapter.

[0030] In this embodiment, the support member 32 is an L-shaped elastic plastic sheet with one end protruding to form an insertion part 12. The insertion part 12 can be inserted into the first insertion hole 1a or the second insertion hole 1b on the main body 11. After the entire support member 32 is held tightly by the hole wall, it becomes the fulcrum of the lever arm 31. The lever arm 31 straddles the support member 32, and the center of the arm body is integrally connected to the support member 32. The center of the wall body is a rough range and does not necessarily have to strictly divide the lever arm 31 into two segments of equal length. The inner wall of the tail sleeve 2 is integrally formed with a protrusion or concavity to form an unlocking slope 21. The angle between the slope and the connector axis is less than the material self-locking angle, so that when the tail sleeve 2 slides backward, the slope and the transmission part 312 of the lever arm 31 maintain surface contact, converting the axial tension into a component force parallel to the unlocking slope 21. The transmission part 312 of the lever arm 31 therefore swings along the slope, and the locking protrusion 3111 moves down and disengages from the adapter locking groove. When the tail sleeve 2 moves forward and resets, the pressure of the slope on the transmission part 312 disappears, and the lever arm 31 relies on its own material rebound to press the locking protrusion 3111 back into the locking groove, completing the self-locking. When switching poles, simply pull the support 32 out of the current insertion hole, rotate the main body 11 half a turn, and then press the support 32 into the other insertion hole. The direction of the locking protrusion 3111 will then be flipped, and the positions of the uplink and downlink optical fibers will be interchanged. Throughout the process, the lever arm 31 and the support 32 remain connected and do not need to be reassembled. The locking mechanism 3 in this embodiment has a clear force path, and fatigue is distributed to the two materials of the support 32 and the lever arm 31, which further improves long-term reliability.

[0031] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 9 In one embodiment of this utility model, the tail sleeve 2 is provided with a clearance hole 2a. The side wall of the clearance hole 2a near the insertion part 12 is formed with an unlocking slope 21, and the side wall of the clearance hole 2a away from the insertion part 12 is formed with a safety hole 2b. The transmission part 312 extends into the clearance hole 2a and is formed with a safety protrusion 3121. The safety protrusion 3121 extends into the safety hole 2b. When the tail sleeve 2 slides away from the insertion part 12, the safety protrusion 3121 disengages from the safety hole 2b, and the unlocking slope 21 slides against the transmission part 312.

[0032] In this embodiment, the core objective is to prevent accidental locking when the optical fiber is pulled. Since the optical fiber is connected to the connector body 1, and the connector body 1 abuts against the locking part 311 of the lever arm 31, when the optical fiber is pulled, the connector body 1 reacts to the locking part 311, applying a force that deforms the lever arm 31, causing the locking protrusion 3111 to disengage from the adapter. Simultaneously, the transmission part 312 moves away from the connector body 1 and tilts upwards. To avoid this situation, this embodiment uses a safety hole 2b and a safety protrusion 3121 to ensure that only the sliding operation of the tail sleeve 2 triggers the unlocking action, while pulling the optical fiber cannot unlock it.

[0033] Specifically, the tail sleeve 2 is provided with a clearance hole 2a. An unlocking ramp 21 is formed on the side wall of the clearance hole 2a near the connector semi-finished product, while a safety hole 2b is formed on the side wall of the clearance hole 2a away from the connector semi-finished product. The transmission part 312 of the lever arm 31 extends into the clearance hole 2a, and the transmission part 312 has a safety protrusion 3121 that extends into the safety hole 2b. When the tail sleeve 2 is pulled away from the connector semi-finished product, the safety protrusion 3121 disengages from the safety hole 2b, the unlocking ramp 21 slides against the transmission part 312, the transmission part 312 slides along the unlocking ramp 21 and moves away from the connector body 1, thereby deforming the lever arm 31 and causing the locking protrusion 3111 to disengage from the fiber optic adapter. When the optical fiber is pulled, the safety protrusion 3121 extends into the safety hole 2b, restricting the movement of the transmission part 312 of the lever arm 31. This prevents the locking part 311 and lever arm 31 from undergoing significant deformation due to the reaction force of the connector body 1, thus preventing false locking caused by pulling the optical fiber. Only when the tail sleeve 2 is pulled will the safety protrusion 3121 disengage from the safety hole 2b, and the unlocking ramp 21 will contact the transmission part 312, thereby triggering the unlocking action. This design effectively prevents false locking caused by pulling the optical fiber, improving the stability and reliability of the optical fiber connector during use.

[0034] Further, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 9 In one embodiment of this utility model, the side wall of the safety hole 2b is provided with an anti-detachment groove 2c, and the side of the safety protrusion 3121 facing the opening of the avoidance hole 2a is provided with an anti-detachment protrusion 3122, which is engaged with the anti-detachment groove 2c; when the tail sleeve 2 slides away from the insertion part 12, the anti-detachment protrusion 3122 is engaged with the anti-detachment groove 2c.

[0035] In this embodiment, to further enhance the limiting of the safety protrusion 3121 and prevent false locking when the optical fiber is pulled, an anti-detachment protrusion 3122 is provided on the side of the safety protrusion 3121 facing the opening of the clearance hole 2a, and an anti-detachment groove 2c is provided on the side wall of the safety hole 2b. The anti-detachment protrusion 3122 engages with the inner wall of the anti-detachment groove 2c, further strengthening the connection between the safety protrusion 3121 and the tail sleeve 2 and preventing false locking. Importantly, when the tail sleeve 2 is pulled to disengage the anti-detachment protrusion 3122 from the anti-detachment groove 2c or pushed to engage the anti-detachment protrusion 3122 into the anti-detachment groove 2c, the presence of the anti-detachment protrusion 3122 and the anti-detachment groove 2c provides tactile feedback. Therefore, the user can clearly know whether the safety mechanism is active or deactivated, and thus determine the next step. For example, determining whether the safety mechanism is deactivated allows the user to decide whether to continue pulling out the connector, or determining whether the safety mechanism is active allows the user to leave with peace of mind. This improves the information feedback of the safety function.

[0036] Further, please refer to Figure 6 and Figure 10 In one embodiment of the present invention, the connector body 1 includes an upper housing 13 and a lower housing 14 that are detachably connected to each other. A part of the main body 11 is disposed in the upper housing 13 and another part is disposed in the lower housing 14. A part of the insertion part 12 is disposed in the upper housing 13 and another part is disposed in the lower housing 14. The upper housing 13 and the lower housing 14 enclose a fiber distribution cavity 11a and two ferrule cavities 12a. The two ferrule cavities 12a are both connected to one end of the fiber distribution cavity 11a. A ferrule port 12b communicating with the external space is formed on the side wall of the ferrule cavity 12a away from the fiber distribution cavity 11a. A fiber inlet port 11b communicating with the external space is formed on the side wall of the fiber distribution cavity 11a away from the ferrule cavity 12a. The two ferrule cavities 12a are respectively located in the two insertion parts 12, and the fiber distribution cavity 11a is located in the main body 11.

[0037] In this embodiment, the connector body 1 is disassembled into a detachable upper shell 13 and a lower shell 14. Both shells can have a pair of mirror-image semi-cylindrical grooves and semi-square grooves at their parting surfaces, which, when closed, enclose two front ferrule cavities 12a and a rear fiber distribution cavity 11a. Alternatively, only one of the shells can have a groove, while the other can be a flat plate structure covering the groove opening. The ferrule cavity 12a is completely concealed inside the corresponding insertion part 12. The ferrule cavity 12a communicates with the external adapter guide hole via the ferrule port 12b, while the fiber distribution cavity 11a communicates with the inner cavity of the tail sleeve 2 via the fiber inlet 11b. The upper and lower housings 14 can be injection molded from the same grade of injection molding material. Several snap-fit ​​protrusions extend symmetrically from both sides of the parting surface of the upper housing 13. The fiber distribution groove or ferrule receiving groove of the lower housing 14 is provided with snap-fit ​​holes for engaging with the snap-fit ​​protrusions. During assembly, the ceramic ferrule with bare fiber is first placed into the lower housing 14, and then the upper housing 13 is closed. Each snap-fit ​​protrusion is then snapped into the snap-fit ​​hole in sequence. When maintenance is required, the upper and lower housings 14 can be pried open without damage, the ferrule can be removed for re-grinding or replacement, and then the upper housing 13 and lower housing 14 can be closed again, achieving reversible maintenance.

[0038] Further, please refer to Figure 8 and Figure 10 In one embodiment of the present invention, the LC dual-core fiber optic connector 100 further includes a ferrule assembly 4, which includes a ferrule body 41, a first heat-shrink tubing 42, and a spring 43. A portion of the ferrule body 41 is disposed within the ferrule cavity 12a, and another portion of the ferrule body 41 extends into the ferrule port 12b. The first heat-shrink tubing 42 is sleeved on the end of the ferrule body 41 away from the ferrule port 12b. The spring 43 is sleeved on the outside of the first heat-shrink tubing 42 and connects the ferrule body 41 with the inner wall of the ferrule cavity 12a.

[0039] In this embodiment, a ferrule assembly 4 is installed inside the ferrule cavity 12a. The ferrule assembly 4 consists of a ferrule body 41, a first heat-shrink tubing 42, and a spring 43. The spring 43 connects the ferrule body 41 to the inner wall of the ferrule cavity 12a. The ferrule body 41 can obtain axial floating compensation capability to reduce end face separation caused by adapter tolerance or temperature changes. The front end of the ferrule body 41 is made of zirconia ceramic, and the rear end extends into a stainless steel tail. The outer diameter of the tail is slightly smaller than the outer diameter of the ceramic, forming a step. The first heat-shrink tubing 42 is made of transparent polyolefin material. After heating and shrinking, it simultaneously covers the tail and the bare fiber, which not only reinforces the easily broken bare fiber transition area but also forms a buffer outer layer to prevent the subsequent force of the spring 43 from directly compressing the glass fiber. Spring 43 can be made of stainless steel wire with a free length greater than the depth of the ferrule cavity 12a. During assembly, it is first slipped over the already shrunk first heat shrink tubing 42, and then pushed into the ferrule cavity 12a along with the ferrule. An annular boss is provided at the bottom of the cavity; the front end of spring 43 abuts against the boss, and the rear end abuts against the tail step, forming pre-compression. When the connector is inserted into the adapter, the ceramic end face contacts the opposite ferrule, and spring 43 is further compressed. The resulting rebound force ensures that both end faces remain tightly fitted under vibration, thermal expansion and contraction, or manufacturing tolerances, avoiding reflection loss caused by air gaps. For repairs, the first heat shrink tubing 42 is reheated with a hot air gun to soften the adhesive layer, allowing the ferrule to be removed without damage. Spring 43 automatically pops out and can be reused. Therefore, it balances end face floating compensation and ease of maintenance, making it suitable for single-mode transmission scenarios with stringent return loss requirements.

[0040] Further, please refer to Figure 8 and Figure 10 In one embodiment of the present invention, a guide member 111 is provided in the fiber distribution cavity 11a. The guide member 111 gradually contracts along the direction from the insert cavity 12a to the fiber inlet 11b to form two guide slopes 112. The two guide slopes 112 are respectively connected to the inner wall of one insert cavity 12a.

[0041] In this embodiment, a guide member 111 is built into the fiber separation cavity 11a. The guide member 111 is integrally injection molded with the lower housing 14, and is wedge-shaped. It gradually expands from the fiber inlet 11b towards the two insert cavities 12a, forming symmetrical guide slopes 112. The starting point of the slope is close to the fiber inlet 11b, and the ending point is tangent to the inner wall arc of the corresponding insert cavity 12a, so that the cavity cross section smoothly transitions from a single hole to a double hole. When threading the fiber, the two bare fibers are first naturally separated by the guide slopes 112, and then slide into the corresponding insert cavity 12a along their respective slopes, achieving separation and positioning without the need for tools. The surface of the slope can be mirror polished to reduce frictional resistance and prevent scratches on the surface of the bare fibers. A gap is maintained between the top of the guide member 111 and the upper housing 13. When the insert assembly 4 is installed, this gap allows the guide member 111 to undergo slight elastic deformation when the housing is closed, absorbing accumulated dimensional errors and ensuring that the connecting surfaces of the upper and lower housings 14 fit flat. Through the gradually contracting structure of the guide 111, the fiber splitting cavity 11a completes the fiber splitting and alignment within a limited length, avoiding cross-entanglement and providing a stable foundation for the floating of the spring 43 and the end face contact.

[0042] Further, please refer to Figure 2 , Figure 6 and Figure 10 In one embodiment of the present invention, a first polarity marking part 113 and a second polarity marking part 114 are respectively provided on the two opposite outer side walls of the main body 11, and an observation window 2f is also provided on the side of the tail sleeve 2 facing away from the locking mechanism 3; the first polarity marking part 113 or the second polarity marking part 114 is exposed in the observation window 2f.

[0043] In this embodiment, a first polarity marking section 113 and a second polarity marking section 114 are respectively provided on the upper and lower outer side walls of the main body 11. They are symmetrically distributed about the axis. To distinguish between the first polarity marking section 113 and the second polarity marking section 114, they can use different colored graphics, different characters, or one concave and one convex mark, etc. A transparent observation window 2f is integrally injection molded on the back of the tail sleeve 2, and the window position corresponds to the polarity marking section. When the tail sleeve 2 is in its natural position, the currently active polarity marking section faces the window, allowing the operator to visually confirm the polarity without unplugging the connector. After rotating the main body 11 to change the polarity, the other polarity marking section immediately moves into the window area, providing immediate visual feedback. Both the polarity marking section and the observation window 2f are integrally molded with the housing, requiring no labeling or painting, and are not worn during long-term use, meeting the rapid identification needs in high-density wiring environments.

[0044] Further, please refer to Figures 4 to 6 , Figure 8In one embodiment of the present invention, the LC dual-core fiber optic connector 100 further includes a connecting tube 51 and a second heat-shrinkable tube 52; the connecting tube 51 is inserted into the end of the main body 11 away from the insertion part 12, and the second heat-shrinkable tube 52 is sleeved on the end of the connecting tube 51 away from the main body 11.

[0045] In this embodiment, a connecting tube 51 and a second heat-shrinkable tube 52 are added to the tail end of the main body 11 to form a progressively transitioning cable protection channel. The front and rear outer walls of the connecting tube 51 are provided with annular ribs. The front end of the connecting tube 51 is interference-fitted into the tail hole of the main body 11. The rear end of the connecting tube 51 is fitted with the second heat-shrinkable tube 52. After heat shrinking, the inner wall of the second heat-shrinkable tube 52 is simultaneously bonded to the annular ribs and the outer sheath of the optical cable, forming a flexible seal. The connecting tube 51 is made of a more flexible elastic plastic than the main body 11. When the optical cable swings laterally, the connecting tube 51 first undergoes bending deformation, blocking the transmission of bending force to the main body 11. After the adhesive layer cures, the second heat-shrinkable tube 52 forms a circumferential reinforcement, preventing the optical cable sheath from being flattened or torn. This two-section structure releases the stiffness gradient between the rigid shell and the flexible optical cable in stages, taking into account sealing, bending resistance, and ease of on-site assembly.

[0046] Further, please refer to Figure 2 , Figure 4 , Figure 9 and Figure 10 In one embodiment of the present invention, the inner wall of the tail sleeve 2 is provided with a travel limiting groove 2d, and the outer wall of the main body 11 is provided with a limiting protrusion 115, which is limited within the travel limiting groove 2d.

[0047] In this embodiment, a travel limiting groove 2d extending along the sliding direction of the tail sleeve 2 is formed on the top and / or bottom wall of the tail sleeve 2. The groove width matches the limiting protrusion 115 protruding from the top and / or bottom wall of the main body 11. When the limiting protrusion 115 abuts against the end of the travel limiting groove 2d away from the insertion part 12, the tail sleeve 2 is in a position close to the insertion part 12, the safety protrusion 3121 is inserted into the safety hole 2b, and the anti-disengagement protrusion 3122 is engaged with the anti-disengagement groove 2c. When the tail sleeve 2 is pulled back, When the limiting protrusion 115 slides along the groove to one end of the travel limiting groove 2d near the insertion part 12, the groove wall of the travel limiting groove 2d prevents the tail sleeve 2 from moving further backward. The transmission part 312 of the lever arm 31 slides along the unlocking inclined surface 21 on the tail sleeve 2 and rotates around the insertion part 12, gradually moving away from the main body 11 of the connector body 1. The locking part 311 of the lever arm 31 moves in the opposite direction and gradually approaches the insertion part 12, causing the locking protrusion 3111 to disengage from the locking groove inside the fiber optic adapter. The travel limiting groove 2d and the limiting protrusion 115 are integrally molded with the tail sleeve 2 and the main body 11 respectively during injection molding, eliminating the need for additional retaining springs or pins. This limits the sliding range of the tail sleeve 2 and provides the operator with a clear tactile endpoint, ensuring a stable and reliable unlocking stroke.

[0048] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An LC dual-core fiber optic connector for connecting to a fiber optic adapter, characterized in that, The LC dual-core fiber optic connector includes: The connector body (1) includes a main body (11) and two insertion parts (12) formed at one end of the main body (11). The insertion parts (12) are used to insert the fiber optic adapter. The two opposite outer side walls of the main body (11) are respectively provided with a first insertion hole (1a) and a second insertion hole (1b). Tail sleeve (2), said tail sleeve (2) being slidably fitted onto one end of the main body (11) away from the insertion part (12); and The locking mechanism (3) has a locking part (311), a plug-in part (321) and a transmission part (312). The transmission part (312) is connected to the tail sleeve (2). The plug-in part (321) can be plugged into the first plug-in hole (1a) or the second plug-in hole (1b). The locking part (311) is used to insert the fiber optic adapter and snap it into the fiber optic adapter. When the tail sleeve (2) slides away from the insertion part (12), the tail sleeve (2) drives the transmission part (312) to rotate around the plug part (321) so that the locking part (311) disengages from the fiber optic adapter.

2. The LC dual-core fiber optic connector as described in claim 1, characterized in that, The tail sleeve (2) is provided with an unlocking ramp (21); The locking mechanism (3) includes a support member (32) and a lever arm (31). The support member (32) has an insertion part (12). The lever arm (31) has a locking part (311) and a transmission part (312) at both ends. The locking part (311) abuts against the insertion part (12). The transmission part (312) is disposed opposite to the unlocking inclined surface (21). The support member (32) is connected to the lever arm (31) between the locking part (311) and the transmission part (312). The locking part (311) has a latching protrusion (3111) for engaging with the fiber optic adapter. When the tail sleeve (2) slides away from the insertion part (12), the unlocking slope (21) slides against the transmission part (312) and pushes the transmission part (312) to rotate around the support member (32) so that the card protrusion (3111) disengages from the fiber optic adapter.

3. The LC dual-core fiber optic connector as described in claim 2, characterized in that, The tail sleeve (2) is provided with a clearance hole (2a), and the side wall of the clearance hole (2a) near the insertion part (12) is formed with the unlocking slope (21), and the side wall of the clearance hole (2a) away from the insertion part (12) is formed with a safety hole (2b). The transmission part (312) extends into the clearance hole (2a), and the transmission part (312) is formed with a safety protrusion (3121), which extends into the safety hole (2b); When the tail sleeve (2) slides away from the insertion part (12), the safety protrusion (3121) disengages from the safety hole (2b), and the unlocking slope (21) slides against the transmission part (312).

4. The LC dual-core fiber optic connector as described in claim 3, characterized in that, The safety hole (2b) has an anti-detachment groove (2c) on its side wall, and the safety protrusion (3121) has an anti-detachment protrusion (3122) on the side facing the opening of the clearance hole (2a), and the anti-detachment protrusion (3122) engages with the anti-detachment groove (2c). When the tail sleeve (2) slides away from the insertion part (12), the anti-detachment protrusion (3122) engages with the anti-detachment groove (2c).

5. The LC dual-core fiber optic connector as described in claim 1, characterized in that, The connector body (1) includes an upper housing (13) and a lower housing (14) that are detachably connected to each other. A part of the main body (11) is disposed in the upper housing (13) and another part is disposed in the lower housing (14). A part of the insertion part (12) is disposed in the upper housing (13) and another part is disposed in the lower housing (14). The upper housing (13) and the lower housing (14) enclose a fiber distribution cavity (11a) and two insert cavities (12a). Both insert cavities (12a) are connected to one end of the fiber distribution cavity (11a). An insert port (12b) communicating with the external space is formed on the side wall of the insert cavity (12a) away from the fiber distribution cavity (11a). An inlet port (11b) communicating with the external space is formed on the side wall of the fiber distribution cavity (11a) away from the insert cavities (12a). The two ferrule cavities (12a) are located in the two insertion portions (12) respectively, and the fiber distribution cavity (11a) is located in the main body portion (11).

6. The LC dual-core fiber optic connector as described in claim 5, characterized in that, The LC dual-core fiber optic connector also includes a ferrule assembly (4), which includes a ferrule body (41), a first heat shrink tubing (42), and a spring (43). One part of the ferrule body (41) is disposed in the ferrule cavity (12a), and the other part of the ferrule body (41) extends into the ferrule port (12b). The first heat shrink tube (42) is sleeved on the end of the ferrule body (41) away from the ferrule port (12b). The spring (43) is sleeved on the outside of the first heat shrink tube (42) and connects the ferrule body (41) with the inner wall of the ferrule cavity (12a).

7. The LC dual-core fiber optic connector as described in claim 5, characterized in that, The fiber distribution cavity (11a) is provided with a guide (111). The guide (111) gradually contracts along the direction from the ferrule cavity (12a) to the fiber inlet (11b) to form two guide slopes (112). The two guide slopes (112) are respectively connected to the inner wall of one of the ferrule cavities (12a).

8. The LC dual-core fiber optic connector as described in any one of claims 1 to 7, characterized in that, The main body (11) has a first polarity marking part (113) and a second polarity marking part (114) respectively on its two opposite outer side walls. The tail sleeve (2) also has an observation window (2f) on the side facing away from the locking mechanism (3). The first polarity marking portion (113) or the second polarity marking portion (114) is exposed in the observation window (2f).

9. The LC dual-core fiber optic connector as described in any one of claims 1 to 7, characterized in that, The LC dual-core fiber optic connector also includes a connecting tube (51) and a second heat shrink tube (52). The connecting tube (51) is inserted into the end of the main body (11) away from the insertion part (12), and the second heat shrink tube (52) is sleeved on the end of the connecting tube (51) away from the main body (11).

10. The LC dual-core fiber optic connector as described in any one of claims 1 to 7, characterized in that, The inner wall of the tail sleeve (2) is provided with a travel limiting groove (2d), and the outer wall of the main body (11) is provided with a limiting protrusion (115). The limiting protrusion (115) is limited to the travel limiting groove (2d).

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