A scanning camera off-focus measurement collimator

Abstract

The application discloses a kind of scanning camera defocus measurement collimator, comprising: front lens sleeve, the surface of the front lens sleeve is provided with clamping groove, the surface of the front lens sleeve is connected with the adapter sleeve of clamping groove, the side of the adapter sleeve away from front lens sleeve is provided with buckle groove, the surface of the adapter sleeve in buckle groove is slidably connected with connecting sleeve, the surface of the adapter sleeve in buckle groove is connected with the constraint sleeve, the inner wall of the constraint sleeve is provided with limiting groove, through the cooperation of each structure in the application, the special structure on the graph card is distributed at different distances along the axial direction by using the graph card to be placed obliquely relative to the lens optical axis, and the special design of the graph card, when using the camera to take a photo of the collimator, the clarity of different structures can reflect the relative focus position of the camera, and the ability of the equipment to detect special vehicle-mounted cameras is realized.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic performance testing technology, specifically to a collimator for defocus measurement without scanning camera. Background Technology

[0002] The core components of a vehicle-mounted camera can be categorized as follows: Focal length: The focal length determines the field of view. A smaller focal length results in a larger field of view and a wider observation range, but distant objects may not be clearly distinguishable. A larger focal length results in a smaller field of view and a narrower observation range, but distant objects can still be seen clearly. Automatic aperture lens: Video-driven type, where the lens itself contains an amplifier circuit to convert the video amplitude signal from the camera into control of the aperture motor; DC-driven type, which uses the DC voltage on the camera to directly control the aperture. Zoom lens: Zoom lenses are divided into manual and electric types. Manual zoom lenses are generally used in scientific research projects rather than in closed-circuit surveillance systems. The advantage of electric lenses is a large zoom range, allowing for both viewing a wide area and focusing on a specific detail.

[0003] However, existing processing equipment has the following shortcomings:

[0004] For example, in CN202393958U, existing testing equipment often uses a motor to change the relative position of the chart and the lens when measuring the optimal focal plane position of the camera to find the optimal imaging distance. This method involves complex systems, and the measurement must be done by scanning, which greatly prolongs the entire measurement time. This is not conducive to the requirement of shortening the production (measurement) cycle as much as possible in industrial production.

[0005] Therefore, we propose a non-scanning camera defocus measurement collimator to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a collimator for defocus measurement without scanning camera. Through the cooperation of various structures in this application, the pattern card is placed at an angle relative to the optical axis of the lens. At the same time, the specially designed pattern card distributes special structures on the pattern card at different distances along the axial direction. When the collimator is photographed by a camera, the clarity of different structures can reflect the relative focal position of the camera. This enables the device to detect special vehicle-mounted cameras, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-scanning camera defocus measurement collimator, comprising: a front lens sleeve, a groove formed on the surface of the front lens sleeve, a connecting sleeve engaged with the surface of the front lens sleeve in the groove, a snap-fit ​​groove formed on the side of the connecting sleeve away from the front lens sleeve, a connecting sleeve slidably connected to the surface of the connecting sleeve in the snap-fit ​​groove, a constraint sleeve engaged with the surface of the connecting sleeve in the snap-fit ​​groove, a limit groove formed on the inner wall of the constraint sleeve, a limit sleeve engaged with the inner wall of the constraint sleeve in the limit groove, and a tail sleeve engaged with the inner wall of the limit sleeve;

[0008] A positioning ring is fixedly connected to the inner wall of the front lens sleeve. A convex lens abuts against the inner wall of the front lens sleeve, and the convex lens abuts against the surface of the positioning ring. A concave lens abuts against the inner wall of the front lens sleeve, and the concave lens abuts against the surface of the convex lens. Through the cooperation of the various structures in this application, the pattern card is placed at an angle relative to the optical axis of the lens. Simultaneously, the specially designed pattern card distributes the special structures on the pattern card at different distances along the axial direction. When a camera takes a picture of the collimator, the clarity of different structures reflects the relative focal position of the camera, enabling the device to detect special vehicle-mounted cameras. In the novel collimator, the pattern card is placed at an angle relative to the optical axis of the lens, and the specially designed pattern card distributes the special structures (patterns) on the pattern card at different distances along the axial direction. When a camera takes a picture of the collimator, the clarity of different structures reflects the relative focal position of the camera. The specially designed pattern card placement angle and structure eliminate the need for scanning when using this system for measurement, thus greatly improving the measurement speed. This invention simplifies system modifications and significantly reduces costs. Furthermore, the tilt angle of the image card and its special structure are calculated based on camera and lens parameters. By incorporating this invention, the detection of vehicle-mounted cameras is facilitated, thereby reducing the difficulty of detecting vehicle-mounted cameras, improving the detection efficiency of vehicle-mounted cameras, and enhancing the convenience of detection equipment.

[0009] Preferably, the connecting sleeve abuts against the surface of the constraint sleeve, a limiting ring is fixedly connected to the inner wall of the constraint sleeve, an assembly cylinder abuts against the inner wall of the constraint sleeve, and the limiting ring abuts against the side surface of the assembly cylinder. The limiting ring can restrict the position of the assembly cylinder, thereby reducing the probability of the assembly cylinder's deviation and improving the stability of the assembly cylinder.

[0010] Preferably, the inner wall of the assembly cylinder has a mounting groove, and an inclined graphic card is fixedly connected to the inner wall of the mounting groove. The inclined graphic card is inclined at 45°, and the inclination spacing of the graphic on the inclined graphic card is 2mm. A sealing ring is fixedly connected to the inner wall of the constraint sleeve, and the side surface of the assembly cylinder abuts against the sealing ring. The mounting groove on the inner wall of the assembly cylinder allows for the installation of the inclined graphic card, thereby fixing the position of the inclined graphic card and achieving the transmission effect of the inclined graphic card.

[0011] Preferably, the inner wall of the limiting sleeve abuts against a light source lens, the inner wall of the limiting sleeve abuts against a constraint cylinder, the inner wall of the limiting sleeve abuts against an LED light source board, the inner wall of the limiting sleeve abuts against a restraining ring, and an isolation ring is fixedly connected to the surface of the restraining ring.

[0012] Preferably, the constraint cylinder abuts against the side surface of the light source lens, the LED light source board abuts against the side surface of the constraint cylinder, the constraint ring abuts against the surface of the LED light source board, and the isolation ring abuts against the inner wall of the limiting sleeve. The LED light source board provides light to the equipment, improving the imaging effect of the equipment's photography and video recording, thereby increasing the equipment's clarity. This solution is compact, easy to assemble for testing, and highly versatile; the light source brightness is adjustable, enhancing the product's applicability; LED supplementary lighting provides stable performance and a long lifespan; the overall structure is made of metal, ensuring structural stability and resistance to deformation; it is simple and uncomplicated to use, saving measurement time and improving efficiency; the specially designed chart placement angle and chart structure eliminate the need for scanning during measurement, greatly increasing measurement speed, simplifying system modifications, and significantly reducing costs; the chart's tilt angle and special structure are calculated based on camera and lens parameters.

[0013] Preferably, the inner wall of the tail sleeve is fitted with an end cap, and the tail sleeve abuts against the side surface of the isolation ring. The tail sleeve can support and fix the position of the end cap, and at the same time, it can work with the end cap to seal the tail of the equipment, so that the equipment is in a closed state.

[0014] Preferably, a wire is fixedly connected to the inner wall of the tail sleeve, and a plug is fixedly connected to the input end of the wire. A circular hole is opened on the surface of the end cover. The wire abuts against the inner wall of the circular hole and passes through the circular hole. The LED light source board is electrically connected to the output end of the wire. The device can be assembled on the processing terminal by using the cooperation of the wire and the plug. At the same time, power can be provided to the device through the wire.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention, through a novel collimator, places the pattern card at an angle relative to the lens optical axis. Simultaneously, a specially designed pattern card distributes special structures (patterns) along the axial direction at different distances. When a camera photographs the collimator, the clarity of these different structures reflects the camera's relative focal position. The specially designed pattern card placement angle and structure eliminate the need for scanning during measurement using this system, significantly increasing measurement speed. It also simplifies system design and greatly reduces costs. Furthermore, the pattern card's tilt angle and special structures are calculated based on camera and lens parameters. This invention facilitates the inspection of vehicle-mounted cameras, thereby reducing the difficulty of inspection, improving inspection efficiency, and enhancing the convenience of the inspection equipment.

[0017] 2. The advantages of this invention are as follows: It is compact and easy to assemble for testing, with strong versatility; the light source brightness is adjustable, enhancing the product's applicability; it uses LED supplementary lighting, which is stable and has a long lifespan; the overall structure is made of metal, ensuring structural stability and preventing deformation; it is simple and uncomplicated to use, saving measurement time and improving efficiency; the specially designed chart placement angle and chart structure eliminate the need for scanning when using this system, greatly increasing measurement speed, simplifying system modifications, and significantly reducing costs; the chart's tilt angle and special structure are calculated based on camera and lens parameters. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the main structure in a collimator for defocus measurement of a non-scanning camera according to the present invention;

[0019] Figure 2 This is an enlarged three-dimensional cross-sectional view of the collimator structure for defocus measurement using a non-scanning camera according to the present invention.

[0020] Figure 3 The present invention provides a collimator for measuring defocusing of a non-scanning camera. Figure 2 Enlarged 3D view of the structure at point A in the middle;

[0021] Figure 4 This is a three-dimensional structural view of a collimator for defocus measurement using a non-scanning camera according to the present invention, in embodiment two.

[0022] Figure 5 This is a schematic diagram of the tilt chart in the collimator for measuring defocusing of a non-scanning camera according to the present invention when it is tilted;

[0023] Figure 6 This is a schematic diagram of the tilt chart in the collimator for measuring defocusing of a non-scanning camera according to the present invention when it is tilted;

[0024] Figure 7 This is a schematic diagram of the tilt chart in the collimator for measuring defocusing of a non-scanning camera according to the present invention.

[0025] In the diagram: 1. Front lens sleeve; 2. Connecting sleeve; 3. Connecting sleeve; 4. Constraint sleeve; 5. Limiting sleeve; 6. Tail sleeve; 7. Positioning ring; 8. Convex lens; 9. Concave lens; 10. Limiting ring; 11. Assembly sleeve; 12. Mounting groove; 13. Tilt drawing; 14. Sealing ring; 15. Light source lens; 16. Constraint sleeve; 17. LED light source board; 18. Restraint ring; 19. Isolation ring; 20. End cap; 21. Wire; 22. Plug. Detailed Implementation

[0026] 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.

[0027] Example 1:

[0028] Please see Figure 1-7 As shown, the present invention provides a technical solution: a non-scanning camera defocus measurement collimator, comprising: a front lens sleeve 1, a slot is formed on the surface of the front lens sleeve 1, a connecting sleeve 2 is attached to the surface of the front lens sleeve located in the slot, a buckle groove is formed on the side of the connecting sleeve 2 away from the front lens sleeve 1, a connecting sleeve 3 is slidably connected to the surface of the connecting sleeve 2 located in the buckle groove, a constraint sleeve 4 is attached to the surface of the connecting sleeve 2 located in the buckle groove, a limit groove is formed on the inner wall of the constraint sleeve 4, a limit sleeve 5 is attached to the inner wall of the constraint sleeve 4 located in the limit groove, and a tail sleeve 6 is attached to the inner wall of the limit sleeve 5.

[0029] according to Figure 2-3As shown, a positioning ring 7 is fixedly connected to the inner wall of the front lens sleeve 1. A convex lens 8 abuts against the inner wall of the front lens sleeve 1, with the convex lens 8 abutting against the surface of the positioning ring 7. A concave lens 9 abuts against the inner wall of the front lens sleeve 1, with the concave lens 9 abutting against the surface of the convex lens 8. Through the cooperation of the various structures in this application, the pattern card is placed at an angle relative to the optical axis of the lens. At the same time, the specially designed pattern card distributes the special structures on the pattern card at different distances along the axial direction. When the camera takes a picture of the collimator, the clarity of the different structures can reflect the relative focal position of the camera, realizing the ability of the device to detect special vehicle-mounted cameras. In the new collimator, the pattern card is placed at an angle relative to the optical axis of the lens, and at the same time, the specially designed pattern card distributes the special structures on the pattern card at different distances along the axial direction. The design of the pattern card allows special structures (patterns) on the card to be distributed at different distances along the axial direction. When a camera is used to photograph the collimator, the clarity of different structures can reflect the relative focal position of the camera. The specially designed placement angle and structure of the pattern card eliminate the need for any scanning when using this system for measurement, thereby greatly improving the measurement speed. At the same time, it simplifies system modifications and significantly reduces costs. Furthermore, the tilt angle of the pattern card and the special structures on the card are calculated based on camera and lens parameters. By implementing this invention, the detection of vehicle-mounted camera heads is facilitated, thereby reducing the difficulty of detecting vehicle-mounted cameras, improving the detection efficiency of vehicle-mounted cameras, and enhancing the convenience of detection equipment.

[0030] according to Figure 2-3 As shown, the surfaces of the connecting sleeve 3 and the constraint sleeve 4 abut against each other. A limit ring 10 is fixedly connected to the inner wall of the constraint sleeve 4. An assembly cylinder 11 abuts against the inner wall of the constraint sleeve 4. The limit ring 10 abuts against the side surface of the assembly cylinder 11. The position of the assembly cylinder 11 can be restricted by the limit ring 10, thereby reducing the probability of the assembly cylinder 11 deviating and improving the stability of the assembly cylinder 11.

[0031] according to Figure 2-3 As shown, an installation groove 12 is formed on the inner wall of the assembly cylinder 11. An inclined graphic card 13 is fixedly connected to the inner wall of the mounting groove 12. The inclined graphic card 13 is set at a 45° angle, and the inclination spacing of the graphics on the inclined graphic card 13 is 2mm. A sealing ring 14 is fixedly connected to the inner wall of the constraint sleeve 4, and the side surface of the assembly cylinder 11 abuts against the sealing ring 14. The inclined graphic card 13 can be installed using the installation groove 12 formed on the inner wall of the assembly cylinder 11, thereby fixing the position of the inclined graphic card 13 to achieve the transmission effect of the inclined graphic card 13.

[0032] according to Figure 2-3As shown, the inner wall of the limiting sleeve 5 abuts against the light source lens 15, the inner wall of the limiting sleeve 5 abuts against the constraint cylinder 16, the inner wall of the limiting sleeve 5 abuts against the LED light source board 17, the inner wall of the limiting sleeve 5 abuts against the restraint ring 18, and the surface of the restraint ring 18 is fixedly connected to the isolation ring 19.

[0033] according to Figure 2-3 As shown, the constraint cylinder 16 abuts against the side surface of the light source lens 15, the LED light source board 17 abuts against the side surface of the constraint cylinder 16, the constraint ring abuts against the surface of the LED light source board 17, and the isolation ring 19 abuts against the inner wall of the limiting sleeve 5. The LED light source board 17 can provide a light source for the equipment to improve the imaging effect of the equipment's photography and video recording, thereby improving the clarity of the equipment. This solution is small in size, easy to build and test, and has strong versatility; the brightness of the light source is adjustable, enhancing the applicability of the product; LED supplementary lighting is used, which has stable performance and long life; the overall structure of the product is made of metal, making the structure stable and not easily deformed; it is simple and uncomplicated to use, saving measurement time and improving efficiency; the specially designed chart placement angle and specially designed chart structure mean that no scanning is required when using this system for measurement, thereby greatly improving the measurement speed, while making the system simple to change and greatly reducing costs; the tilt angle of the chart and the special structure on the chart are calculated based on the camera and lens parameters.

[0034] according to Figure 2-3 As shown, the end cap 20 is snapped onto the inner wall of the tail sleeve 6. The tail sleeve 6 abuts against the side surface of the isolation ring 19. The tail sleeve 6 can support and fix the position of the end cap 20, and at the same time, it can work with the end cap 20 to seal the tail of the equipment, so that the equipment is in a closed state.

[0035] Example 2:

[0036] according to Figure 1-4 As shown, a slot is provided on the surface of the front lens sleeve 1, and a connecting sleeve 2 is engaged with the surface of the front lens sleeve located in the slot. A buckle groove is provided on the side of the connecting sleeve 2 away from the front lens sleeve 1. A connecting sleeve 3 is slidably connected to the surface of the connecting sleeve 2 located in the buckle groove. A restraining sleeve 4 is engaged with the surface of the connecting sleeve 2 located in the buckle groove. A limit groove is provided on the inner wall of the restraining sleeve 4. A limit sleeve 5 is engaged with the inner wall of the limit groove. A tail sleeve 6 is engaged with the inner wall of the limit sleeve 5.

[0037] according to Figure 2-3As shown, a positioning ring 7 is fixedly connected to the inner wall of the front lens sleeve 1, and a convex lens 8 abuts against the inner wall of the front lens sleeve 1. The convex lens 8 abuts against the surface of the positioning ring 7. A concave lens 9 abuts against the inner wall of the front lens sleeve 1. The concave lens 9 abuts against the surface of the convex lens 8. Through the cooperation of the various structures in this application, the pattern card is placed at an angle relative to the optical axis of the lens. At the same time, the specially designed pattern card makes the special structures on the pattern card distributed at different distances along the axial direction. When the camera takes a picture of the collimator, the clarity of the different structures can reflect the relative focal position of the camera, realizing the ability of the device to detect special vehicle-mounted cameras.

[0038] according to Figure 2-3 As shown, the surfaces of the connecting sleeve 3 and the constraint sleeve 4 abut against each other. A limit ring 10 is fixedly connected to the inner wall of the constraint sleeve 4. An assembly cylinder 11 abuts against the inner wall of the constraint sleeve 4. The limit ring 10 abuts against the side surface of the assembly cylinder 11. The position of the assembly cylinder 11 can be restricted by the limit ring 10, thereby reducing the probability of the assembly cylinder 11 deviating and improving the stability of the assembly cylinder 11.

[0039] according to Figure 2-3 As shown, an installation groove 12 is formed on the inner wall of the assembly cylinder 11. An inclined drawing card 13 is fixedly connected to the inner wall of the assembly cylinder 11 in the installation groove 12. A sealing ring 14 is fixedly connected to the inner wall of the constraint sleeve 4. The side surface of the assembly cylinder 11 abuts against the sealing ring 14. The inclined drawing card 13 can be installed using the installation groove 12 formed on the inner wall of the assembly cylinder 11, thereby fixing the position of the inclined drawing card 13 to achieve the transmission effect of the inclined drawing card 13.

[0040] according to Figure 2-3 As shown, the inner wall of the limiting sleeve 5 abuts against the light source lens 15, the inner wall of the limiting sleeve 5 abuts against the constraint cylinder 16, the inner wall of the limiting sleeve 5 abuts against the LED light source board 17, the inner wall of the limiting sleeve 5 abuts against the restraint ring 18, and the surface of the restraint ring 18 is fixedly connected to the isolation ring 19.

[0041] according to Figure 2-3 As shown, the constraint cylinder 16 abuts against the side surface of the light source lens 15, the LED light source plate 17 abuts against the side surface of the constraint cylinder 16, the constraint ring abuts against the surface of the LED light source plate 17, and the isolation ring 19 abuts against the inner wall of the limiting sleeve 5. The LED light source plate 17 can provide light to the equipment to improve the imaging effect of the equipment's photography and video recording, thereby improving the clarity of the equipment.

[0042] The end cap 20 is snapped onto the inner wall of the tail sleeve 6. The tail sleeve 6 abuts against the side surface of the isolation ring 19. The tail sleeve 6 can be used to support and fix the position of the end cap 20.

[0043] A wire 21 is fixedly connected to the inner wall of the tail sleeve 6. A plug 22 is fixedly connected to the input end of the wire 21. A round hole is opened on the surface of the end cover 20. The wire 21 abuts against the inner wall of the round hole and passes through the round hole. The LED light source board 17 is electrically connected to the output end of the wire 21. The device can be assembled on the processing terminal by using the cooperation of the wire 21 and the plug 22. At the same time, power output can be provided to the device through the wire 21.

[0044] The overall effect of this mechanism is as follows: In the new collimator, the pattern card is placed at an angle relative to the optical axis of the lens. Simultaneously, the specially designed pattern card distributes special structures (patterns) along the axial direction at different distances. When a camera photographs the collimator, the clarity of these different structures reflects the relative focal position of the camera. The specially designed pattern card placement angle and structure eliminate the need for scanning during measurement, significantly increasing measurement speed. This also simplifies system design and greatly reduces costs. Furthermore, the tilt angle and special structures on the pattern card are calculated based on camera and lens parameters. By incorporating this invention, the detection of vehicle-mounted cameras is facilitated, thereby reducing the difficulty of detecting vehicle-mounted cameras, improving detection efficiency, and enhancing the convenience of the detection equipment.

[0045] Furthermore, the advantages of this invention are as follows: its small size facilitates the construction and testing of the mechanism, and it has strong versatility; the brightness of the light source is adjustable, enhancing the applicability of the product; it uses LED supplementary lighting, which has stable performance and a long lifespan; the overall structure of the product is made of metal, making it structurally stable and not easily deformed; it is simple and uncomplicated to use, saving measurement time and improving efficiency; the specially designed chart placement angle and chart structure mean that no scanning is required when using this system for measurement, thereby greatly improving the measurement speed, while also simplifying system modifications and significantly reducing costs; the tilt angle of the chart and the special structure on the chart are calculated based on camera and lens parameters.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A collimator for defocus measurement without scanning camera, characterized in that: include: A front lens sleeve (1) has a slot on its surface. A connecting sleeve (2) is attached to the surface of the front lens sleeve located in the slot. A buckle groove is provided on the side of the connecting sleeve (2) away from the front lens sleeve (1). A connecting sleeve (3) is slidably connected to the surface of the connecting sleeve (2) located in the buckle groove. A constraint sleeve (4) is attached to the surface of the connecting sleeve (2) located in the buckle groove. A limit groove is provided on the inner wall of the constraint sleeve (4). A limit sleeve (5) is attached to the inner wall of the limit groove. A tail sleeve (6) is attached to the inner wall of the limit sleeve (5). The inner wall of the front lens sleeve (1) is fixedly connected to a positioning ring (7), the inner wall of the front lens sleeve (1) is abutted by a convex lens (8), the convex lens (8) abuts against the surface of the positioning ring (7), the inner wall of the front lens sleeve (1) is abutted by a concave lens (9), the concave lens (9) abuts against the surface of the convex lens (8). The surface of the connecting sleeve (3) abuts against the surface of the constraint sleeve (4), the inner wall of the constraint sleeve (4) is fixedly connected to the limiting ring (10), the inner wall of the constraint sleeve (4) abuts against the assembly cylinder (11), and the limiting ring (10) abuts against the side surface of the assembly cylinder (11). The inner wall of the assembly cylinder (11) is provided with an installation groove (12). An inclined drawing card (13) is fixedly connected to the inner wall of the installation groove (12) of the assembly cylinder (11). The inclined drawing card (13) is set at a 45° angle. The inclination spacing of the inclined drawing card (13) is 2 mm. A sealing ring (14) is fixedly connected to the inner wall of the constraint sleeve (4). The side surface of the assembly cylinder (11) abuts against the sealing ring (14). The inner wall of the limiting sleeve (5) abuts against a light source lens (15), the inner wall of the limiting sleeve (5) abuts against a constraint cylinder (16), the inner wall of the limiting sleeve (5) abuts against an LED light source board (17), the inner wall of the limiting sleeve (5) abuts against a restraint ring (18), and an isolation ring (19) is fixedly connected to the surface of the restraint ring (18). The constraint cylinder (16) abuts against the side surface of the light source lens (15), the LED light source board (17) abuts against the side surface of the constraint cylinder (16), and the isolation ring (19) abuts against the inner wall of the limiting sleeve (5). The end cap (20) is snapped onto the inner wall of the tail sleeve (6), and the tail sleeve (6) abuts against the side surface of the isolation ring (19). The inner wall of the tail sleeve (6) is fixedly connected to a wire (21), and the input end of the wire (21) is fixedly connected to a plug (22); The end cap (20) has a circular hole on its surface; The wire (21) abuts against the inner wall of the circular hole, and the wire (21) is disposed through the circular hole; The LED light source board (17) is electrically connected to the output end of the wire (21).

Images