Electric zoom lens

Abstract

The invention discloses an electric zoom lens, which includes a lens barrel, a lens, a focusing mechanism and a detection component; the lens barrel is a hollow structure; the focusing mechanism includes a focusing component and a focusing ring, the focusing component includes a driving member, a slider and a connecting member, the focusing ring is sleeved outside the lens barrel and connected to the lens, the driving member drives the focusing ring to rotate through the slider to adjust the distance of the lens relative to the lens barrel to achieve rapid focusing; the detection component is used to detect the position change during the zooming process of the lens. The present invention can realize accurate detection of position changes during lens zooming, with high reset accuracy; can greatly reduce the number of empty return steps during the focusing process of the electric zoom lens, thereby greatly improving the focusing speed of the current electric zoom lens, and greatly reducing the difficulty of realizing the synchronous focusing function; when focusing, the lens group moves fast, which improves the focusing speed of the lens, the transmission efficiency of the transmission system is high, and the load driving capacity loss is small; and extremely low operating noise can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to an electric zoom lens. Background Art

[0002] The current electric zoom lens uses a stepper motor to drive a gear reducer (multi-stage transmission), which in turn drives a focus ring with a gear to rotate, thereby achieving the electric zoom function. This structure of using a stepper motor and a reducer to drive the lens focus has at least the following defects:

[0003] (1) Reset to zero by mechanical limit, the reset accuracy is poor.

[0004] (2) The large number of empty steps results in slow autofocus speed and difficulty in achieving synchronized focus function (it is difficult to keep the image clear during zooming).

[0005] (3) The large reduction ratio results in slow movement of the lens group during focusing, which leads to slow focusing speed.

[0006] (4) Loud noise.

[0007] (5) The transmission efficiency is low and the loss of load driving capacity is large. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide an electric zoom lens.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] An electric zoom lens comprises a lens barrel, a lens, a focusing mechanism and a detection component;

[0011] The lens barrel is a hollow structure to accommodate the lens;

[0012] The focusing mechanism comprises a focusing assembly and a focusing ring, wherein the focusing assembly comprises a driving member, a slider and a connecting member, wherein the driving member is arranged on the lens barrel and is used to drive the slider to move along the axis direction perpendicular to the lens barrel, wherein the driving member adopts a motor screw type driving structure, wherein the connecting member is movably arranged on the slider, and one end of the connecting member is hinged to the side of the lens barrel, wherein the focusing ring is movably sleeved outside the lens barrel and connected to the lens, wherein the driving member drives the focusing ring to rotate through the slider to adjust the distance of the lens relative to the lens barrel to realize fast focusing;

[0013] The detection component is used to detect the position change of the lens during zooming.

[0014] Preferably, the focusing mechanism also includes a fixed seat, which is arranged on the side of the lens barrel, the focusing assembly also includes a mounting seat, which is arranged on the fixed seat, the driving member is arranged on the mounting seat, and the side of the focusing ring is provided with a hinged seat for hingedly connecting the connecting member.

[0015] Preferably, the lens barrel comprises a front lens barrel and a rear lens barrel, the front lens barrel and the rear lens barrel are fixed together along the optical axis direction, the lens comprises a front lens and a rear lens, the front lens and the rear lens are respectively accommodated in the front lens barrel and the rear lens barrel, the focusing mechanism comprises a front focusing assembly, a front focusing ring, a rear focusing assembly and a rear focusing ring, the front focusing ring is movably mounted outside the front lens barrel and connected to the front lens, the front focusing ring is driven to rotate by the front focusing assembly to adjust the distance of the front lens relative to the front lens barrel to achieve rapid focusing, the rear focusing ring is movably mounted outside the rear lens barrel and connected to the rear lens, the rear focusing ring is driven to rotate by the rear focusing assembly to adjust the distance of the rear lens relative to the rear lens barrel to achieve rapid focusing, and the detection assembly is used to detect the position changes of the front lens and the rear lens during the zooming process.

[0016] Preferably, the focusing mechanism also includes a fixed seat, which is arranged on the side of the rear lens barrel, the front focusing assembly includes a front driving member, a front sliding block and a front connecting member, the front driving member is arranged on the fixed seat, and is used to drive the front sliding block to move along the axial direction perpendicular to the front lens barrel, the front connecting member is movably inserted into the front sliding block, and one end of which is hinged to the side of the front lens barrel, the rear focusing assembly includes a rear driving member, a rear sliding block and a rear connecting member, the rear driving member is arranged on the fixed seat, and is used to drive the rear sliding block to move along the axial direction perpendicular to the rear lens barrel, the rear connecting member is movably inserted into the rear sliding block, and one end of which is hinged to the side of the rear lens barrel.

[0017] Preferably, the front focusing assembly also includes a front mounting seat, which is arranged on the top of the fixed seat, and the front driving member is arranged on the front mounting seat. The rear focusing assembly also includes a rear mounting seat, which is arranged on the bottom of the fixed seat, and the rear driving member is arranged on the rear mounting seat. The front driving member and the rear driving member both adopt a motor screw-type driving structure, and the front slider and the rear slider are respectively screwed to the screw. The detection assembly is arranged on the fixed seat, and detects the zoom of the front lens and the rear lens by moving the front slider and the rear slider.

[0018] Preferably, the front slider and the rear slider each include a slider body, a connecting part and a sensing part, the connecting part is provided on one side of the slider body, and the sensing part is provided on the other side, the connecting part is respectively provided with a groove and a through hole, one side of the groove is provided with a screw thread matching with the lead screw, the through hole is used to penetrate the front connecting piece / rear connecting piece, and the detection component detects the zoom of the front lens and the rear lens through the movement of the sensing part.

[0019] Preferably, the detection assembly includes a mounting plate and two optical couplers, the mounting plate is arranged on the side of the fixing seat, and the two optical couplers are arranged on the mounting plate, and are respectively used to detect the movement of the sensing parts of the front slider and the rear slider.

[0020] Preferably, the front lens barrel includes a front barrel body and a connecting block, the front barrel body is a hollow structure, and a plurality of front guide openings are arranged along the circumference of the front barrel body, and the front guide openings are parallel to the axial direction of the front barrel body. A plurality of front guide blocks adapted to the front guide openings are arranged in the outer wall of the front lens, and the front guide blocks are screwed to the front focusing ring. The connecting block is arranged at the bottom of the front barrel body, and a positioning opening is arranged on the side of the connecting block, and a socket and a first mounting hole are arranged on the bottom.

[0021] Preferably, the rear lens barrel includes a rear barrel and a connecting seat, the rear barrel is a hollow structure, and the rear barrel is provided with a plurality of rear guide openings along its circumference, and the rear guide openings are parallel to the axial direction of the rear barrel, and a plurality of rear guide blocks adapted to the rear guide openings are provided in the outer wall of the rear lens, and the rear guide blocks are screwed with the rear focusing ring, and the connecting seat is arranged at the top of the rear barrel, and a mounting groove communicating with the rear barrel is provided at the top of the connecting seat, a positioning block is provided on the side of the mounting groove, and a plug column and a second mounting hole are provided at the bottom, and the lower end of the front barrel is accommodated in the mounting groove, the positioning block is matched with the positioning opening, and the plug column is matched with the plug hole, and the rear barrel and the front barrel are fixed together by a locking member passed through the second mounting hole and the first mounting hole.

[0022] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0023] 1. The present invention can realize accurate detection of position changes during lens zooming through a detection component, and has high resetting accuracy.

[0024] 2. The present invention can significantly reduce the number of empty return steps during the focusing process of the electric zoom lens, thereby greatly improving the focusing speed of the current electric zoom lens, greatly reducing the difficulty of realizing the synchronous focusing function, and ensuring clear images during the zooming process.

[0025] 3. The present invention can simultaneously reduce the reduction ratio of the transmission system, so that the lens group moves quickly during focusing, thereby improving the focusing speed of the lens. At the same time, the transmission efficiency of the transmission system is high and the loss of load driving capacity is small.

[0026] 4. The present invention can achieve extremely low operating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is one of the three-dimensional schematic diagrams of the present invention;

[0028] Figure 2 This is the second stereoscopic schematic diagram of the present invention;

[0029] Figure 3 It is one of the decomposition schematic diagrams of the present invention;

[0030] Figure 4 is a cross-sectional view of the present invention;

[0031] Figure 5 This is the second exploded schematic diagram of the present invention (partial);

[0032] Figure 6 It is a schematic diagram of the structure of the front lens barrel;

[0033] Figure 7 It is a schematic diagram of the structure of the rear lens barrel;

[0034] Figure 8 is an exploded schematic diagram of the focusing mechanism;

[0035] Fig. 9 It is a schematic diagram of the structure of the front connecting member and the rear connecting member.

[0036] Description of reference numerals:

[0037] Front lens barrel 100, front barrel body 110, front guide port 111, connection block 120, positioning port 121, plug hole 122, first mounting hole 123;

[0038] The rear lens barrel 200, the rear barrel body 210, the rear guide port 211, the connecting seat 220, the mounting groove 221, the positioning block 222, the plug post 223, and the second mounting hole 224;

[0039] Front lens 300, front guide block 310;

[0040] Rear lens 400, rear guide block 410;

[0041] Front focusing assembly 510, front driving member 511, front slider 512, front connecting member 513, front mounting seat 514, front focusing ring 520, front hinge seat 521, rear focusing assembly 530, rear driving member 531, rear slider 532, rear connecting member 533, rear mounting seat 534, rear focusing ring 540, rear hinge seat 541, fixing seat 550, slider body 561, connecting portion 562, groove 5621, through hole 5622, sensing portion 563;

[0042] Detection component 600 , mounting plate 610 , and optical coupler 620 . DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Embodiment 1

[0046] Cooperate Figure 1 and Figure 2 As shown, this embodiment discloses an electric zoom lens, including a lens barrel, a lens, a focusing mechanism and a detection component.

[0047] The lens barrel is a hollow structure to accommodate the lens. The focusing mechanism includes a focusing assembly and a focusing ring. The focusing assembly includes a driving member, a slider and a connecting member. The driving member is arranged on the lens barrel to drive the slider to move along the axis direction perpendicular to the lens barrel. The driving member adopts a motor screw type driving structure. The connecting member is movably arranged on the slider, and one end of the connecting member is hinged to the side of the lens barrel. The focusing ring is movably sleeved outside the lens barrel and connected to the lens. The driving member drives the focusing ring to rotate through the slider to adjust the distance of the lens relative to the lens barrel to achieve fast focusing.

[0048] The focusing mechanism also includes a fixed seat, which is arranged on the side of the lens barrel. The focusing assembly also includes a mounting seat, which is arranged on the fixed seat. The driving member is arranged on the mounting seat. A hinged seat is arranged on the side of the focusing ring for hinged connection.

[0049] The detection component is used to detect the position change of the lens during zooming.

[0050] Embodiment 2

[0051] Cooperate Figures 1 to 4 As shown, this embodiment discloses an electric zoom lens, including a lens barrel, a lens, a focusing mechanism and a detection component, wherein the focusing mechanism and the detection component can perform position detection on one of the front lens and the rear lens or on both the front lens and the rear lens during the focusing and zooming process. In this embodiment, the focusing mechanism and the detection component perform position detection on both the front lens and the rear lens during the focusing and zooming process.

[0052] The lens barrel includes a front lens barrel 100 and a rear lens barrel 200, which are fixed together along the optical axis direction. The lens includes a front lens 300 and a rear lens 400, which are respectively accommodated in the front lens barrel 100 and the rear lens barrel 200.

[0053] Cooperate Figure 1 , Figure 2 , Figures 5 to 7 As shown, the front lens barrel 100 includes a front barrel body 110 and a connecting block 120. The front barrel body 110 is a hollow structure. The front barrel body 110 is provided with a plurality of front guide openings 111 along its circumference. The front guide openings 111 are parallel to the axial direction of the front barrel body 110. The outer wall of the front lens 300 is provided with a plurality of front guide blocks 310 adapted to the front guide openings 111. The front guide blocks 310 are screwed with the front focusing ring 520. Under the guiding effect of the front guide openings 111, the front lens 300 moves more accurately relative to the front lens barrel 100, thereby ensuring the accuracy of the rapid focusing of the front lens 300. The connecting block 120 is provided at the bottom of the front barrel body 110. The side of the connecting block 120 is provided with a positioning opening 121, and the bottom is provided with a plug hole 122 and a first mounting hole 123.

[0054] The rear lens barrel 200 includes a rear barrel body 210 and a connecting seat 220. The rear barrel body 210 is a hollow structure. The rear barrel body 210 is provided with a plurality of rear guide openings 211 along its circumference. The rear guide openings 211 are parallel to the axial direction of the rear barrel body 210. The outer wall of the rear lens 400 is provided with a plurality of rear guide blocks 410 adapted to the rear guide openings 211. The rear guide blocks 410 are screwed to the rear focusing ring 540. Under the guiding action of the rear guide openings 211, the movement of the rear lens 400 relative to the rear lens barrel 200 is more precise, thereby ensuring the accuracy of the rapid focusing of the rear lens 400. The connection seat 220 is arranged at the top of the rear barrel 210. The top of the connection seat 220 is provided with a mounting groove 221 which is communicated with the rear barrel 210. The side of the mounting groove 221 is provided with a positioning block 222, and the bottom is provided with a plug column 223 and a second mounting hole 224. The lower end of the front barrel 110 is accommodated in the mounting groove 221. The positioning block 222 is plugged with the positioning port 121, and the plug column 223 is plugged with the plug hole 122 to ensure the position accuracy between the front barrel 110 and the rear barrel 210. The rear barrel 210 and the front barrel 110 are fixed together by a locking member (screws are used in this embodiment) passing through the second mounting hole 224 and the first mounting hole 123. Compared with the original method of installing the front barrel and the rear barrel through the main barrel, the method of fixing the front lens barrel 100 and the rear lens barrel 200 together has a simpler structure, lower cost, and smaller assembly error.

[0055] Cooperate Figures 1 to 3 , Figure 8 , Fig. 9 As shown, the focusing mechanism includes a front focusing assembly 510, a front focusing ring 520, a rear focusing assembly 530 and a rear focusing ring 540. The front focusing ring 520 is movably mounted outside the front lens barrel 100 and connected to the front lens 300. The front focusing assembly 510 drives the front focusing ring 520 to rotate to adjust the distance between the front lens 300 and the front lens barrel 100 to achieve rapid focusing. The rear focusing ring 540 is movably mounted outside the rear lens barrel 200 and connected to the rear lens 400. The rear focusing assembly 530 drives the rear focusing ring 540 to rotate to adjust the distance between the rear lens 400 and the rear lens barrel 200 to achieve rapid focusing. The detection assembly 600 is used to detect the position changes of the front lens 300 and the rear lens 400 during the zooming process.

[0056] The focusing mechanism also includes a fixed seat 550, which is arranged on the side of the rear lens barrel 200. The front focusing assembly 510 includes a front driving member 511, a front slider 512 and a front connecting member 513. The front driving member 511 is arranged on the fixed seat 550, and is used to drive the front slider 512 to move along the axial direction perpendicular to the front lens barrel 100. The front connecting member 513 is movably penetrated on the front slider 512, and one end thereof is hinged to the side of the front lens barrel 100. In the present embodiment, a front articulated seat 521 is arranged on the side of the front focusing ring 520, which is used to hinge the front connecting member 513, and the front connecting member 513 is a rod. The rear focusing assembly 530 includes a rear driving member 531, a rear slider 532 and a rear connecting member 533. The rear driving member 531 is arranged on the fixed seat 550, and is used to drive the rear slider 532 to move along the axial direction perpendicular to the rear lens barrel 200. The rear connecting member 533 is movably inserted into the rear slider 532, and one end of which is hinged to the side of the rear lens barrel 200. In this embodiment, a rear hinge seat 541 is arranged on the side of the rear focusing ring 540, which is used to hinge the rear connecting member 533. The rear connecting member 533 adopts a rod.

[0057] The front focusing assembly 510 also includes a front mounting seat 514, which is arranged on the top of the fixed seat 550, and the front driving member 511 is arranged on the front mounting seat 514. The rear focusing assembly 530 also includes a rear mounting seat 534, which is arranged on the bottom of the fixed seat 550, and the rear driving member 531 is arranged on the rear mounting seat 534. The front driving member 511 and the rear driving member 531 both adopt a motor screw-type driving structure, and the front slider 512 and the rear slider 532 are respectively screwed to the screw. The detection assembly 600 is arranged on the fixed seat 550, and it detects the zoom of the front lens 300 and the rear lens 400 through the movement of the front slider 512 and the rear slider 532.

[0058] The front slider 512 and the rear slider 532 both include a slider body 561, a connecting portion 562 and a sensing portion 563. An L-shaped connecting portion 562 is provided on one side of the slider body 561, and a sensing portion 563 is provided on the other side. A groove 5621 and a through hole 5622 are respectively provided on the connecting portion 562. A screw thread matching with the lead screw is provided on one side of the groove 5621. The through hole 5622 is used for passing the front connecting member 513 / rear connecting member 533. The detection component 600 detects the zoom of the front lens 300 and the rear lens 400 by moving the sensing portion 563.

[0059] Cooperate Figure 1 , Figure 8 and Fig. 9As shown, the detection component 600 includes a mounting plate 610 and two optocouplers 620 (the optocouplers can emit and receive light signals and output currents of different sizes according to the light signals). The mounting plate 610 is arranged on the side of the fixing seat 550, and the two optocouplers 620 are arranged on the mounting plate 610, and are respectively used to detect the movement of the front slider and the rear slider sensing part 563.

[0060] Cooperate Figures 1 to 9 As shown, the slider is driven to move by the front driving member 511 and the rear driving member 531, and then the linear motion of the slider is converted into the circular motion of the front focusing ring 520 and the rear focusing ring 540. The front focusing ring 520 and the rear focusing ring 540 then drive the front lens 300 and the rear lens 400 to move respectively through the front guide block 310 and the rear guide block 410, so as to realize the focusing function of the optical lens. During the movement of the slider, the sensing part 563 blocks the sensing light of the optical coupler 620, so that the output current of the optical coupler 620 changes. By collecting the change of the output current of the optical coupler 620, the position of the slider when the output current of the optical coupler 620 changes during the focusing process can be confirmed. This position is used as the initial position, so that the position detection during the zooming process of the lens can be realized.

[0061] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electric zoom lens, characterized in that: It includes a lens barrel, a lens, a focusing mechanism and a detection component; The lens barrel is a hollow structure to accommodate the lens; The focusing mechanism comprises a focusing assembly and a focusing ring, wherein the focusing assembly comprises a driving member, a slider and a connecting member, wherein the driving member is arranged on the lens barrel and is used to drive the slider to move along the axis direction perpendicular to the lens barrel, wherein the driving member adopts a motor screw type driving structure, wherein the connecting member is movably arranged on the slider, and one end of the connecting member is hinged to the side of the focusing ring, wherein the focusing ring is movably sleeved outside the lens barrel and connected to the lens, wherein the driving member drives the focusing ring to rotate through the slider to adjust the distance of the lens relative to the lens barrel to realize fast focusing; The detection component is used to detect the position change of the lens during zooming; The focusing mechanism further comprises a fixing seat, which is arranged on the side of the lens barrel, the focusing assembly further comprises a mounting seat, which is arranged on the fixing seat, the driving member is arranged on the mounting seat, and the side of the focusing ring is provided with an articulated seat for articulating the connecting member; The lens barrel comprises a front lens barrel and a rear lens barrel, the front lens barrel and the rear lens barrel are fixed together along the optical axis direction, the lens comprises a front lens and a rear lens, the front lens and the rear lens are respectively accommodated in the front lens barrel and the rear lens barrel, the focusing mechanism comprises a front focusing assembly, a front focusing ring, a rear focusing assembly and a rear focusing ring, the front focusing ring is movably sleeved outside the front lens barrel and connected with the front lens, the front focusing ring is driven to rotate by the front focusing assembly to adjust the distance of the front lens relative to the front lens barrel to achieve rapid focusing, the rear focusing ring is movably sleeved outside the rear lens barrel and connected with the rear lens, the rear focusing ring is driven to rotate by the rear focusing assembly to adjust the distance of the rear lens relative to the rear lens barrel to achieve rapid focusing, and the detection assembly is used to detect position changes of the front lens and the rear lens during zooming; The focusing mechanism also includes a fixed seat, which is arranged on the side of the rear lens barrel. The front focusing assembly includes a front driving member, a front slider and a front connecting member. The front driving member is arranged on the fixed seat and is used to drive the front slider to move along the axis direction perpendicular to the front lens barrel. The front connecting member is movably inserted into the front slider, and one end of which is hinged to the side of the front lens barrel. The rear focusing assembly includes a rear driving member, a rear slider and a rear connecting member. The rear driving member is arranged on the fixed seat and is used to drive the rear slider to move along the axis direction perpendicular to the rear lens barrel. The rear connecting member is movably inserted into the front slider. The rear slider is hinged at one end to the side of the rear lens barrel; the front focusing assembly also includes a front mounting seat, which is arranged at the top of the fixed seat, and the front driving member is arranged on the front mounting seat; the rear focusing assembly also includes a rear mounting seat, which is arranged at the bottom of the fixed seat, and the rear driving member is arranged on the rear mounting seat. The front driving member and the rear driving member both adopt a motor screw-type driving structure, the front slider and the rear slider are respectively screwed with the screw, and the detection assembly is arranged on the fixed seat, which detects the zoom of the front lens and the rear lens through the movement of the front slider and the rear slider.

2. The electric zoom lens according to claim 1, characterized in that: The front slider and the rear slider each include a slider body, a connecting portion and a sensing portion. The connecting portion is provided on one side of the slider body and the sensing portion is provided on the other side. A groove and a through hole are respectively provided on the connecting portion. A screw thread matching with a lead screw is provided on one side of the groove. The through hole is used to penetrate the front connecting member / rear connecting member. The detection component detects the zoom of the front lens and the rear lens by moving the sensing portion.

3. The electric zoom lens according to claim 2, characterized in that: The detection assembly includes a mounting plate and two optical couplers. The mounting plate is arranged on the side of the fixing seat. The two optical couplers are arranged on the mounting plate and are respectively used to detect the movement of the sensing parts of the front slider and the rear slider.

4. The electric zoom lens according to any one of claims 1 to 3, characterized in that: The front lens barrel includes a front barrel body and a connecting block. The front barrel body is a hollow structure. The front barrel body is provided with a plurality of front guide openings along its circumference. The front guide openings are parallel to the axial direction of the front barrel body. The outer wall of the front lens is provided with a plurality of front guide blocks adapted to the front guide openings. The front guide blocks are screwed to the front focusing ring. The connecting block is provided at the bottom of the front barrel body. The side of the connecting block is provided with a positioning opening, and the bottom is provided with a plug hole and a first mounting hole.

5. The electric zoom lens according to claim 4, characterized in that: The rear lens barrel includes a rear barrel and a connecting seat, the rear barrel is a hollow structure, and a plurality of rear guide openings are arranged on the rear barrel along its circumference, and the rear guide openings are parallel to the axial direction of the rear barrel, and a plurality of rear guide blocks adapted to the rear guide openings are arranged in the outer wall of the rear lens, and the rear guide blocks are screwed with the rear focusing ring, and the connecting seat is arranged on the top of the rear barrel, and a mounting groove communicating with the rear barrel is arranged on the top of the connecting seat, a positioning block is arranged on the side of the mounting groove, and a plug column and a second mounting hole are arranged on the bottom, and the lower end of the front barrel is accommodated in the mounting groove, the positioning block is matched with the positioning opening, and the plug column is matched with the plug hole, and the rear barrel and the front barrel are fixed together by a locking member penetrated through the second mounting hole and the first mounting hole.

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