LC type fiber optic connector B-value testing device

Abstract

This invention relates to the field of LC connector testing technology and discloses a B-value testing device for LC fiber optic connectors. This invention solves the problem that existing LC connector B-value testing using mechanized equipment does not consider the influence of the fiber cladding mode on the test data. The invention utilizes an electric push rod, a first push plate, a second push plate, and a compression spring. Activating the electric push rod causes the upper clamping block to move upwards and outwards. This raises one end of the output and input fibers connected to the upper clamping block to a certain height, then pulls one end towards the other. Since the lower clamping block remains stationary, the movement of the upper clamping block causes the output and input fibers to be squeezed into a loop. Due to the special shape of this loop, a signal attenuation effect is generated, thereby eliminating the additional optical signal brought by the cladding mode and avoiding deviations in the test values. Furthermore, the looping is controlled mechanically, making it easier to control the loop diameter compared to manual looping, preventing excessively large loop diameters and excessive losses.

Description

Technical Field

[0001] This invention relates to the field of LC connector testing technology, specifically to a device for testing the B-value of LC type fiber optic connectors. Background Technology

[0002] The LC connector is a small fiber optic connector, a smaller version of the earlier SC fiber optic connector, with a square plastic housing featuring a 1.25 mm ceramic ferrule. Due to factors such as coaxiality and angular alignment, there is a certain error between the input and output power of the LC connector. This error is the signal attenuation value of the LC connector, also known as the B value. The B value of the LC connector can be calculated using a combination of a light source and a power meter.

[0003] Currently, the combined testing device for light sources and power meters on the market connects one end of a standard LC connector to the light source transmitter, and the other end to the test LC connector via a standard adapter. The other end of the LC connector is connected to the optical power meter via a standard optical fiber. Then, the B value is calculated using the formula α = -logP1 / P2, thus completing the B value test of the LC connector. The above testing method is based on document YD / T895-1997, entitled "Technical Conditions for Single-Mode Fiber Optic Connectors". However, the existing testing device neglects the problem that the cladding mode of the standard optical fiber can easily excite cladding mode light at the end of the fiber and enter the signal light source, which reduces the reliability of the laser test on the optical power meter and affects the final test results.

[0004] To address the aforementioned issues, an innovative design was implemented based on the existing LC-type fiber optic connector B-value detection device. Summary of the Invention

[0005] The purpose of this invention is to provide a B-value testing device for LC type fiber optic connectors. By using this device, the problem of existing LC connectors not considering the influence of fiber cladding mode on the test data when using mechanized equipment to test the B-value is solved.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an LC type fiber optic connector B-value testing device, comprising a laser emitter, a standard component, an adapter component, a testing component, and an optical power meter. The laser emitter and the optical power meter are provided with a testing platform for fixing, and the testing platform is provided with a protective component for protecting the internal installed parts. Two sets of protective components are provided. An electric push rod is fixed at the upper end of the testing platform, and a moving component is connected to one side of the electric push rod, and a fixing component is connected to the other end of the moving component.

[0007] The protective assembly includes a frame mounted on the upper part of the testing platform, and a groove is provided on one side of the frame;

[0008] The moving component includes a long rod connected to one side of the electric push rod, and a drive plate is connected to the outside of the long rod. A T-shaped block is fixed to the outside of the drive plate. Two sets of T-shaped blocks are provided. Push plate one and push plate two are slidably connected to the outside of the two sets of T-shaped blocks. A through rod is connected to the end of push plate one and push plate two. Compression springs are respectively connected between the T-shaped blocks and the inner walls of push plate one and push plate two. The slide groove is slidably connected to the through rod, and a fixing component is connected to the outside of the through rod.

[0009] The fixing components include an upper locking block fixed to the bottom surface of the frame and a lower locking block connected to the outside of the through rod.

[0010] Furthermore, the laser emitter and optical power meter are placed on the upper part of the testing platform, and the standard component includes an input optical fiber that is connected to the output end of the laser emitter, and a standard LC connector is provided at the other end of the input optical fiber.

[0011] Furthermore, the adapter assembly includes a standard LC adapter mounted on one side of the standard LC connector, and a U-shaped bracket is engaged at the bottom of the standard LC adapter. The test assembly includes a test LC connector mounted on the other side of the standard LC adapter, and an output optical fiber is connected to the other end of the test LC connector, and the output optical fiber is connected to the optical power meter.

[0012] Furthermore, the bottom of the U-shaped frame is connected to the electric push rod, and the electric push rod is positioned between the two sets of protective components. One set of protective components is fixedly connected to the testing table, while the other set of protective components is slidably connected to the testing table.

[0013] Furthermore, a rotating rod is provided through the outer side of the top of the frame, and a cover plate is fixed to the outer side of the rotating rod. An operating button is connected to the end of the rotating rod. The cover plate is movably connected to the frame through the rotating rod, and the area of ​​the cover plate is the same as the cross-sectional size of the frame.

[0014] Furthermore, the first and second push plates slide on the outer wall of the T-shaped block through the internally opened limiting groove, and the compression spring is fixed to the inner wall of the limiting groove. The first and second push plates are distributed vertically.

[0015] Furthermore, sawtooth strips are fixed to adjacent sides of the first and second push plates, and gears mesh between the two sets of sawtooth strips, with the gears located on one side of the drive plate.

[0016] Furthermore, the slide is in the shape of an inverted "L", and when the through rod is located in the vertical section of the slide, the compression spring is stretched to its maximum, and when the compression spring returns to its normal state, the through rod moves to the very end of the slide.

[0017] Furthermore, when the through rod is at its initial height, the upper and lower locking blocks are flush, and the upper and lower locking blocks engage with the input and output optical fibers.

[0018] Furthermore, a pressing component is provided inside the top of the frame, and the pressing component includes a support rod fixed to the top surface inside the frame, and a movable plate is movably connected to the lower end of the support rod. A return spring is connected between one end of the movable plate and the top surface inside the frame, and a pressing rod is provided at the other end of the movable plate. The lower locking block is in contact with the bottom surface of the movable plate, and when the lower locking block moves to the highest point, the pressing rod presses the spring piece provided at the upper end of the test LC connector.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The LC fiber optic connector B-value detection device proposed in this invention addresses the issue that existing LC connector B-value detection methods using mechanized equipment do not consider the influence of the fiber cladding mode on the detection data. This invention utilizes an electric push rod, a first push plate, a second push plate, and a compression spring. Activating the electric push rod causes the upper clamping block to move upwards and outwards, raising one end of the output and input fibers connected to the upper clamping block to a certain height before pulling it towards the other end. Since the lower clamping block remains stationary, the upper clamping block, after moving, causes the output and input fibers to be squeezed into a loop. Due to the special shape of this loop, a signal attenuation effect is generated, thereby eliminating the additional optical signal from the cladding mode and preventing deviations in the detection value. Furthermore, the looping is controlled mechanically, making it easier to control the loop diameter compared to manual looping, preventing excessively large loop diameters and excessive losses. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ;

[0024] Figure 4 This is a schematic diagram of the initial state structure of the fixed component of the present invention;

[0025] Figure 5 This is a schematic diagram of the mobile component structure of the present invention. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the mobile component structure of the present invention. Figure 2 ;

[0027] Figure 7This is a schematic diagram of the pressing component structure of the present invention. Figure 1 ;

[0028] Figure 8 This is a schematic diagram of the pressing component structure of the present invention. Figure 2 ;

[0029] Figure 9 This is a schematic diagram of the output optical fiber looping structure of the present invention.

[0030] In the diagram: 1. Testing platform; 2. Laser emitter; 3. Standard components; 31. Input fiber optic cable; 32. Standard LC connector; 4. Adapter assembly; 41. Standard LC adapter; 42. U-shaped frame; 5. Test assembly; 51. Test LC connector; 52. Output fiber optic cable; 6. Optical power meter; 7. Protective assembly; 71. Frame; 71A. Slide groove; 72. Cover plate; 73. Operating button; 8. Electric push rod; 9. Moving assembly; 91. Long rod; 92. Drive plate; 93. T-block; 94. Push plate one; 95. Compression spring; 96. Sawtooth rack; 97. Gear; 98. Push plate two; 99. Through rod; 10. Fixing assembly; 101. Upper locking block; 102. Lower locking block; 11. Pressing assembly; 111. Movable plate; 112. Support rod; 113. Return spring; 114. Compression rod. Detailed Implementation

[0031] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0033] Combination Figures 1-2 The LC type fiber optic connector B-value testing device includes a laser emitter 2, a standard component 3, an adapter component 4, a testing component 5, and an optical power meter 6. The laser emitter 2 and the optical power meter 6 are provided with a testing platform 1 for fixing at their bottoms. The testing platform 1 is provided with a protective component 7 for protecting the internal installed parts. There are two sets of protective components 7. An electric push rod 8 is fixed at the upper end of the testing platform 1. One side of the electric push rod 8 is connected to a moving component 9, and the other end of the moving component 9 is connected to a fixing component 10.

[0034] The present invention will be further described below with reference to embodiments.

[0035] Please see Figures 3-6The protective component 7 includes a frame 71 set on the upper end of the testing table 1, and a groove 71A is provided on one side of the frame 71 so that the frame 71 restricts the movement trajectory of the through rod 99.

[0036] The moving component 9 includes a long rod 91 connected to one side of the electric push rod 8, and a drive plate 92 is connected to the outside of the long rod 91. A T-shaped block 93 is fixed to the outside of the drive plate 92. Two sets of T-shaped blocks 93 are provided. Push plate 1 94 and push plate 2 98 are slidably connected to the outside of the two sets of T-shaped blocks 93. A through rod 99 is connected to the end of push plate 1 94 and push plate 2 98. Compression springs 95 are respectively connected between the T-shaped block 93 and the inner wall of push plate 1 94 and push plate 2 98. The slide groove 71A is slidably connected to the through rod 99, and a fixing component 10 is connected to the outside of the through rod 99. The electric push rod 8 can be used to make push plate 1 94 and push plate 2 98 move synchronously.

[0037] The fixing component 10 includes an upper locking block 101 fixed to the bottom surface of the frame 71 and a lower locking block 102 connected to the outside of the through rod 99, which can fix the position of the input optical fiber 31 and the output optical fiber 52.

[0038] A rotating rod is provided through the outer side of the top of the frame 71, and a cover plate 72 is fixed to the outer side of the rotating rod. An operating button 73 is connected to the end of the rotating rod. The cover plate 72 is movably connected to the frame 71 through the rotating rod, and the area of ​​the cover plate 72 is the same as the cross-sectional size of the frame 71, which facilitates the simultaneous rotation of the cover plate 72. The cover plate 72 can play a protective role during testing.

[0039] The bottom of the U-shaped frame 42 is connected to the electric push rod 8, and the electric push rod 8 is located between the two sets of protective components 7. One set of protective components 7 is fixedly connected to the testing table 1, and the other set of protective components 7 is slidably connected to the testing table 1, so that the U-shaped frame 42 can be pushed up and down by the electric push rod 8.

[0040] Push plate 1 94 and push plate 2 98 slide on the outer wall of T-block 93 through the internally opened limiting groove sleeve, and the compression spring 95 is fixed on the inner wall of the limiting groove. Push plate 1 94 and push plate 2 98 are distributed vertically.

[0041] Sawtooth strips 96 are fixed on adjacent sides of push plate 1 94 and push plate 2 98 respectively, and gears 97 mesh between the two sets of sawtooth strips 96. The gears 97 are located on one side of drive plate 92, so that the rotation of gears 97 can drive push plate 1 94 and push plate 2 98 to reset by using sawtooth strips 96.

[0042] The slide 71A is inverted "L" shape. When the through rod 99 is located in the vertical section of the slide 71A, the compression spring 95 is stretched to the maximum. When the compression spring 95 returns to the normal state, the through rod 99 moves to the end of the slide 71A, so that the compression spring 95 can push the through rod 99 to move.

[0043] When the through rod 99 is at its initial height, the upper locking block 101 and the lower locking block 102 are flush, and the upper locking block 101 and the lower locking block 102 engage with the input optical fiber 31 and the output optical fiber 52. After the upper locking block 101 moves, the input optical fiber 31 and the output optical fiber 52 can be looped.

[0044] The laser emitter 2 and the optical power meter 6 are placed on the upper part of the test station 1. The standard component 3 includes an input optical fiber 31 that is connected to the output end of the laser emitter 2, and the other end of the input optical fiber 31 is provided with a standard LC connector 32, which can ensure that the test equipment can be connected normally.

[0045] The adapter assembly 4 includes a standard LC adapter 41 mounted on one side of the standard LC connector 32, and a U-shaped bracket 42 is snapped into the bottom of the standard LC adapter 41. The test assembly 5 includes a test LC connector 51 mounted on the other side of the standard LC adapter 41, and an output optical fiber 52 is connected to the other end of the test LC connector 51. The output optical fiber 52 is connected to the optical power meter 6, so that the optical power meter 6 can calculate the output power of the output optical fiber 52.

[0046] Specifically, before testing, the standard component 3, standard LC connector 32, and standard LC adapter 41 need to be installed in place. First, connect one end of the input fiber 31 to the laser emitter 2, and connect the connector at the end of the output fiber 52 to the optical power meter 6. Then, install the input fiber 31 and the output fiber 52 on their respective fixing components 10, so that the upper locking block 101 and the lower locking block 102 are connected to the output fiber 52 and the input fiber 31 as a whole. In the initial state, the upper locking block 101 and the lower locking block 102 are at the same height. At this time, the electric push rod 8 is activated. The electric push rod 8 moves the U-shaped frame 42 upwards, simultaneously moving the long rod 91 connected to it on the outside. This causes the long rod 91 to move the drive plate 92. The drive plate 92 is slidably connected to the first push plate 94 and the second push plate 98 via two sets of T-blocks 93. When the drive plate 92 rises, it pushes the first push plate 94 and the second push plate 98 upwards. A through rod 99 is connected to one side of the first push plate 94 and the second push plate 98. The slide groove 71A is slidably connected to the through rod 99. The groove 71A is L-shaped. When the through rod 99 is driven upward to the highest point of the groove 71A, the electric push rod 8 stops. When the groove 71A moves vertically, the compression springs 95 between the grooves and the T-block 93 inside the push plates 94 and 98 connected to the two sets of through rods 99 are in a stretched state. When it moves to the highest point of the groove 71A, the lateral movement space increases. At this time, the deformation force of the compression springs 95 decreases, so that the two sets of compression springs 95 push the push plates 98 and 94 respectively. The push plate 98 and push plate 94 move outward, causing the through rod 99 to move outward along the slide groove 71A. Each set of through rods 99 is connected to an upper locking block 101 at its end. The upper locking block 101 moves upward and outward, causing one end of the output optical fiber 52 and input optical fiber 31 connected to the upper locking block 101 to first rise to a certain height and then pull one end to the other end. Since the lower locking block 102 is fixed, the upper locking block 101 will squeeze the output optical fiber 52 and input optical fiber 31 out of the circle after moving. This state can be referred to the attached diagram for explanation. Figure 1 and Figure 2When the output fiber 52 and the input fiber 31 are looped at their ends, their special shape can produce signal attenuation. Because the output fiber 52 and the input fiber 3 are bent, when the additional optical signal and signal source enter the bent section, the fiber scatters, and some light cannot pass through the bent section, causing the optical power to decrease. This just cancels out the light generation power at the cladding mode increase point, thereby eliminating the additional optical signal brought by the cladding mode and avoiding deviation in the detection value. At the same time, the looping is controlled by mechanical parts, which makes it easier to control the loop diameter than manual looping, avoiding the loop diameter being too large and avoiding excessive loss. When it is necessary to reverse the movement to restore the initial state, first remove the standard LC adapter 41, rotate the gear 97, and make the sawtooth 96 meshing with the gear 97 move inward, thereby driving the push plate 1 94 and the push plate 2 98 to move inward, so that the push plate 2 98 and the push plate 1 94 drive the through rod 99 to the corresponding position of the vertical section of the slide 71A. At this time, the electric push rod 8 is activated to retract, thereby reducing the height of the upper locking block 101.

[0047] Please see Figures 7-9 A pressing component 11 is provided inside the top of the frame 71. The pressing component 11 includes a support rod 112 fixed to the top surface inside the frame 71. A movable plate 111 is movably connected to the lower end of the support rod 112. A return spring 113 is connected between one end of the movable plate 111 and the top surface inside the frame 71. A pressing rod 114 is provided at the other end of the movable plate 111. The lower locking block 102 is in contact with the bottom surface of the movable plate 111. When the lower locking block 102 moves to the highest point, the pressing rod 114 presses the spring piece provided at the upper end of the test LC connector 51, so that the pressing rod 114 is linked when the upper locking block 101 moves, without the need for manual pressing of the spring piece.

[0048] Specifically, when LC fiber optic connectors are mated, the upper spring tab needs to be pressed. Because there are input fiber 31 and output fiber 52, traditional manual installation requires at least four presses. To reduce manual operations, initially, when the upper locking block 101 and lower locking block 102 are aligned, the movable plate 111 is horizontal. When the lower locking block 102 moves to its highest point, it lifts one end of the movable plate 111, causing it to rotate around the support rod 112. The other end of the movable plate 111 moves downwards and connects to the pressing rod 114, causing the pressing rod 111 to... 4. Moving downwards, the lower locking block 102 then moves outwards, pulling the test LC connector 51 outwards using the output fiber 52. This causes the spring at the upper end of the test LC connector 51 to be pressed by the downward-moving compression rod 114. The standard LC connector 32 at the other end of the input fiber 31 undergoes the same operation. At this time, the springs of both the standard LC connector 32 and the test LC connector 51 are pressed. Then, the standard LC adapter 41 is inserted between the standard LC connector 32 and the test LC connector 51 and installed on the U-shaped bracket 42. When the through rod 99 moves to the end of the slide 71A, the lower locking block 10... 2. No longer in contact with the movable plate 111, the movable plate 111 automatically resets due to the return spring 113. At this point, the docking with the standard LC adapter 41 is complete. The reset of the movable plate 111 causes the pressing rod 114 to stop pressing the spring, thus resetting the spring and restricting the movement of the test LC connector 51. If the gap between the standard LC connector 32 and the test LC connector 51 is larger than that between the standard LC adapter 41, one side of the frame 71 and the optical power meter 6 can be moved. One set of frames 71 is slidably connected to the test stage 1 to ensure that the standard LC adapter 41, standard LC connector 32, and test LC connector 51 are properly connected. After successful docking, the laser emitter 2 is activated to emit a stable light source with known power. The light source enters the test LC connector 51 through the standard component 3 and the standard LC adapter 41 and outputs through the optical fiber 52. The output optical fiber 52 transmits the output light source signal to the optical power meter 6. The optical power meter 6 obtains the output power, and the value can be obtained by using the calculation formula. The above test is repeated three times, and the average of the three test values ​​is the B value of the test LC connector 51. The laser emitter 2 and the optical power meter 6 are common devices on the market and are relatively mature technologies. Therefore, their internal working principles will not be described in detail.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LC-type fiber optic connector B-value testing device, comprising a laser emitter (2), a standard component (3), an adapter component (4), a testing component (5), and an optical power meter (6), characterized in that: The laser emitter (2) and the optical power meter (6) are provided with a testing platform (1) for fixing, and the testing platform (1) is provided with a protective component (7) for protecting the internal installed parts. The protective component (7) is provided in two sets. An electric push rod (8) is fixed at the upper end of the testing platform (1), and a moving component (9) is connected to one side of the electric push rod (8), and a fixing component (10) is connected to the other end of the moving component (9). The protective component (7) includes a frame (71) set at the upper end of the testing table (1), and a groove (71A) is provided on one side of the frame (71); The moving component (9) includes a long rod (91) connected to one side of the electric push rod (8), and a drive plate (92) is connected to the outside of the long rod (91). A T-shaped block (93) is fixed to the outside of the drive plate (92). Two sets of T-shaped blocks (93) are provided. Push plate one (94) and push plate two (98) are slidably connected to the outside of the two sets of T-shaped blocks (93). A through rod (99) is connected to the end of push plate one (94) and push plate two (98). A compression spring (95) is connected between the T-shaped block (93) and the inner wall of push plate one (94) and push plate two (98). The slide groove (71A) is slidably connected to the through rod (99), and a fixing component (10) is connected to the outside of the through rod (99). The fixing component (10) includes an upper locking block (101) fixed to the bottom surface of the frame (71) and a lower locking block (102) connected to the outside of the through rod (99); The laser emitter (2) and the optical power meter (6) are placed on the upper end of the testing platform (1). The standard component (3) includes an input optical fiber (31) connected to the output end of the laser emitter (2), and a standard LC connector (32) is provided at the other end of the input optical fiber (31). The slide (71A) is inverted "L" shape, and when the through rod (99) is located in the vertical section of the slide (71A), the compression spring (95) is stretched to the maximum, and when the compression spring (95) returns to the normal state, the through rod (99) moves to the end of the slide (71A); When the through rod (99) is at its initial height, the upper locking block (101) and the lower locking block (102) are flush, and the upper locking block (101) and the lower locking block (102) engage with the input optical fiber (31) and the output optical fiber (52).

2. The LC-type fiber optic connector B-value detection device according to claim 1, characterized in that: The adapter assembly (4) includes a standard LC adapter (41) mounted on one side of the standard LC connector (32), and a U-shaped bracket (42) is snapped into the bottom of the standard LC adapter (41). The test assembly (5) includes a test LC connector (51) mounted on the other side of the standard LC adapter (41), and an output optical fiber (52) is connected to the other end of the test LC connector (51), and the output optical fiber (52) is connected to the optical power meter (6).

3. The LC-type fiber optic connector B-value detection device according to claim 2, characterized in that: The bottom of the U-shaped frame (42) is connected to the electric push rod (8), and the electric push rod (8) is set between the two sets of protective components (7). One set of protective components (7) is fixedly connected to the test table (1), and the other set of protective components (7) is slidably connected to the test table (1).

4. The LC-type fiber optic connector B-value detection device according to claim 3, characterized in that: A rotating rod is provided through the outer side of the top of the frame (71), and a cover plate (72) is fixed on the outer side of the rotating rod. An operating button (73) is connected to the end of the rotating rod. The cover plate (72) is movably connected to the frame (71) through the rotating rod, and the area of ​​the cover plate (72) is the same as the cross-sectional size of the frame (71).

5. The LC-type fiber optic connector B-value detection device according to claim 1, characterized in that: The first push plate (94) and the second push plate (98) slide on the outer wall of the T-shaped block (93) through the internally opened limiting groove, and the compression spring (95) is fixed on the inner wall of the limiting groove. The first push plate (94) and the second push plate (98) are distributed vertically.

6. The LC-type fiber optic connector B-value detection device according to claim 1, characterized in that: The push plate one (94) and push plate two (98) are respectively fixed with saw teeth (96) on their adjacent sides, and a gear (97) meshes between the two sets of saw teeth (96). The gear (97) is located on one side of the drive plate (92).

7. The LC-type fiber optic connector B-value detection device according to claim 2, characterized in that: The frame (71) is provided with a pressing component (11) inside the top of the frame (71), and the pressing component (11) includes a support rod (112) fixed inside the top surface of the frame (71), and a movable plate (111) is movably connected to the lower end of the support rod (112). A return spring (113) is connected between one end of the movable plate (111) and the top surface inside the frame (71). A pressing rod (114) is provided at the other end of the movable plate (111). The lower locking block (102) is in contact with the bottom surface of the movable plate (111), and when the lower locking block (102) moves to the highest point, the pressing rod (114) presses the spring piece provided at the upper end of the test LC connector (51).

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