Large-aperture optical lens shooting assist device

Abstract

The invention discloses a large-aperture optical lens shooting assist device, and relates to the technical field of photographic equipment, the large-aperture optical lens shooting assist device comprises a shooting assist mechanism, one end of the shooting assist mechanism is provided with a shading mechanism, the other end of the shooting assist mechanism is provided with a protection mechanism, and a plurality of buffer mechanisms are distributed on the outer wall of the shading mechanism. The shooting auxiliary mechanism comprises an outer shield. According to the invention, the lens is protected through the outer shield, the zoom ring is arranged in the middle of the outer shield to provide a zoom adjustment effect, and the connecting seat can provide an installation connection effect, so that the focusing lens and multiple groups of lenses can be conveniently arranged inside, and an effective shooting function is further provided; and the light shield is matched with the connecting ring and is connected with the outer shield, so that a telescopic adjustment effect can be provided, the light shielding area can be adjusted according to the used light environment, and the optical auxiliary shooting effect is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of photographic equipment, in particular to a large aperture optical lens shooting aid. Background Art

[0002] With the continuous development of photography technology, large aperture optical lenses are widely used in various photography scenes, such as portrait photography, landscape photography, close-up photography, etc., to obtain beautiful picture effects with shallow depth of field, prominent subject, and blurred background. However, there are some problems in the use of large aperture lenses.

[0003] In the prior art, for example, the patent application number is CN201720792459.9, "A large aperture telephoto optical imaging device", which is arranged in sequence from the object side to the image plane: a first lens, which is an aspheric lens with a negative focal length; an aperture; a second lens, which is an aspheric lens with a positive focal length; a third lens, which is a spherical lens with a positive focal length; a fourth lens, which is an aspheric lens with a negative focal length; a fifth lens, which is an aspheric lens with a positive focal length; a filter; a photosensitive film; the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, which satisfies: f10, f40.5. The utility model realizes long focal length and large aperture imaging, can meet the requirements of uniform image quality and high brightness, and has infrared confocality, and can be applied to the monitoring field.

[0004] In existing aperture optical lens shooting equipment, large aperture lenses are prone to optical defects such as glare and ghosting in strong light environments, which affects the image quality. To address the above problems, a large aperture optical lens shooting assistant is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a large aperture optical lens shooting aid to solve the problem that when the prior art proposed in the above background technology is operated, large aperture lenses are prone to produce optical defects such as glare and ghosting in a strong light environment, thereby affecting the image quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large aperture optical lens shooting aid, comprising a shooting aid mechanism, a shading mechanism is arranged at one end of the shooting aid mechanism, a protective mechanism is arranged at the other end of the shooting aid mechanism, a plurality of buffer mechanisms are distributed on the outer wall of the shading mechanism, the shooting aid mechanism comprises an outer protective cover, the shading mechanism comprises a shading cover, a connecting ring is connected to the inner side of the shading cover, the inner side of the connecting ring is connected to the outer wall of the outer protective cover, a plurality of connecting strips and limit blocks are evenly distributed on the inner wall of the shading cover in a clockwise direction, the connecting strips and limit blocks are staggered, a plurality of guide strips are evenly distributed on the outer wall of the connecting ring, a plurality of guide grooves are evenly arranged on the outer wall of the outer protective cover, the guide grooves are movably connected to the inner side of the connecting ring, the lens is provided with a protective effect through the outer protective cover, and a zoom ring is arranged in the middle of the outer protective cover. It provides the function of zoom adjustment, and can provide the function of installation connection through the connecting seat, which makes it convenient to place the focus lens and multiple groups of lenses inside, thereby providing an effective shooting function. The lens hood is connected with the connecting ring and the outer shield, which is conducive to providing the function of telescopic adjustment, which is convenient to adjust according to the lighting environment used and the shading area, effectively improving the effect of optical assisted shooting. The connecting strips, guide strips and guide grooves are conducive to providing guidance during the telescopic adjustment process, thereby improving the stability of use and achieving efficient assisted shooting effects. When taking outdoor landscape photos, the photographer may need to shoot a wide scene. At this time, the lens hood can be retracted to the shortest state to avoid the lens hood blocking too much field of view. By extending the lens hood, the incident angle of light can be accurately controlled to minimize the interference of stray light from the surrounding environment on the close-up subject, highlight the details of the subject, and improve the texture of the picture. When photographers need to carry the auxiliary device when shooting, especially in hiking, mountaineering and other shooting activities that require the equipment to carry weight, the lens hood can be completely retracted to reduce the size of the entire auxiliary device, making it easier to store in a backpack, reducing the burden of carrying, and allowing photographers to create anytime, anywhere without being hindered by the large size of the equipment. The retractable lens hood can respond quickly according to the dynamic changes in light conditions.

[0007] Preferably, the protective mechanism includes an anti-slip ring and a connecting tube, a plurality of spring sheets are evenly distributed on the inner wall of the anti-slip ring, a rubber ring is arranged on the inner side of the anti-slip ring, the spring sheets and the rubber ring are connected to the outer wall of the connecting tube, a plurality of spring sheets are distributed on the inner side of the anti-slip ring, and the rubber ring is connected to the outside at the same time, so as to provide a buffering protection effect, and the arc ring is conducive to further increasing the wrapping property, and the outer protective ring and the anti-slip strip are arranged on the outermost side, so as to provide a protective effect, and thus to provide a further protective effect during the use of the lens, and to resist accidental collisions from all directions in daily use. Whether it is a slight bump caused by people coming and going at the shooting site, or a collision with other items during carrying and storage, the protective cover can absorb the impact force by its own elastic deformation, and avoid damage and displacement of the internal precision components such as the micro laser transmitting and receiving device in the high-precision focus auxiliary module and the aperture blade drive motor in the strong light suppression shading component due to collision, so as to ensure that the auxiliary device always maintains a precise working state, which is conducive to extending the service life and preventing the problem of reduced service life due to falling.

[0008] Preferably, the buffer mechanism includes a buffer arc plate, the inner side of which is symmetrically connected with a buffer sheet, one end of which is connected to a mounting seat, and the buffer arc plate and the mounting seat are supported by connecting the buffer sheet, which can provide elastic support.

[0009] Preferably, an arc ring is fixedly connected to one side of the anti-slip ring, the outer wall of the anti-slip ring is provided with an outer protective ring, and a plurality of anti-slip strips are evenly distributed on the outer wall of the outer protective ring. The arc ring further improves the protection performance, and the outer protective ring and the anti-slip strips further provide protection performance on the outside.

[0010] Preferably, a buffer damping rod is connected between the buffer arc plate and the mounting seat, and the outer wall of the buffer damping rod is sleeved with a spring, one end of the spring is connected to the inner wall of the buffer arc plate, and the other end of the spring is connected to the outer wall of the mounting seat. The buffer damping rod and the spring support provide a buffering and shock-absorbing effect, which is beneficial to provide elastic support, further provides a shock-absorbing and protective effect, and is beneficial to improving the use effect, thickening treatment and elastic buffer pad at the connection part with the lens.

[0011] Preferably, a lens is provided at one end of the inner side of the outer shield, and a zoom ring is provided at the middle of the outer wall of the outer shield. The lens can provide a lens shooting function, and the zoom ring can facilitate the adjustment of the shooting, thereby improving the use effect.

[0012] Preferably, a connecting seat is provided at the other end of the outer shield, and a focusing lens is provided at one end of the connecting seat. The connecting seat facilitates effective connection of the focusing lens, and the focusing lens provides an effective use effect.

[0013] Preferably, a limiting ring is arranged on the outer side of the connecting ring, and the limiting ring is connected to the inner side of the light shield. The limiting ring facilitates the provision of the limiting function, further improves the stability of use, and ensures a stable use effect.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, the outer protective cover provides protection for the lens, the zoom ring is arranged in the middle of the outer protective cover to provide a zoom adjustment function, the connecting seat can provide an installation connection function, which is convenient for arranging the focus lens and multiple lens groups inside, thereby providing an effective shooting function, and the light shielding hood is connected with the outer protective cover in conjunction with the connecting ring, so as to provide a telescopic adjustment function, and is convenient for adjusting the shading area according to the lighting environment of use, and effectively improves the effect of optical auxiliary shooting, and the connecting strip, guide strip and guide groove are conducive to providing a guiding function during the telescopic adjustment process, thereby improving the stability of use and achieving a high-efficiency auxiliary shooting effect.

[0016] 2. In the present invention, a plurality of spring sheets are distributed on the inner side of the anti-slip ring, and the anti-slip ring is connected to the outside with a rubber ring, which is conducive to providing a buffering protection effect. The arc ring is conducive to further increasing the wrapping property. The outer protective ring and the anti-slip strip are arranged on the outermost side, which is conducive to providing a protective effect, and further providing a protective effect during the use of the lens, and resisting accidental collisions from all directions in daily use. Whether it is a slight bump caused by people coming and going at the shooting scene, or a collision with other items during carrying and storage, the protective cover can absorb the impact force by its own elastic deformation, avoiding damage and displacement of internal precision components such as the micro laser transmitting and receiving device in the high-precision focus auxiliary module, the aperture blade drive motor in the strong light suppression shading component, etc. due to collision, ensuring that the auxiliary device always maintains a precise working state, which is conducive to extending the service life and preventing the problem of reduced service life due to falling.

[0017] 3. In the present invention, a buffer sheet is used to connect and support the buffer arc plate and the mounting seat. While supporting with the buffer sheet, an elastic support function can be provided. The buffer damping rod and the spring support provide a buffering and shock absorbing effect, which is beneficial to provide elastic support, further provide a shock absorbing and protective effect, and is beneficial to improve the use effect. The thickened treatment and the elastic buffer pad at the connection part with the lens are key designs for protecting the lens. On the one hand, the thickened edge can prevent the impact force from being directly transmitted to the lens during a collision, reducing the risk of damage to the lens housing. On the other hand, the elastic buffer pad provides buffering at the weak link between the auxiliary device and the lens, avoiding loose connection between the lens and the auxiliary device due to collision, and eliminating problems such as shaking of the shooting picture and inaccurate focus due to unstable connection. At the same time, it prevents the lens mount from being deformed and damaged under impact, thereby extending the service life of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A stereoscopic diagram of a large aperture optical lens shooting aid of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a large aperture optical lens shooting aid according to the present invention from another angle;

[0020] Figure 3 This is a schematic diagram of the structure of the lens portion of a large aperture optical lens shooting aid of the present invention;

[0021] Figure 4 This is a schematic structural diagram of the lens portion of a large aperture optical lens shooting aid of the present invention from another angle;

[0022] Figure 5 This is a schematic diagram of the exploded structure of a shading mechanism of a large aperture optical lens shooting aid of the present invention;

[0023] Figure 6 It is a structural schematic diagram of a protective mechanism of a large aperture optical lens shooting aid of the present invention;

[0024] Figure 7 It is a structural schematic diagram of a buffer mechanism of a large aperture optical lens shooting aid of the present invention;

[0025] Figure 8 For the present invention Figure 7 A in the figure is an enlarged structural diagram.

[0026] In the figure:

[0027] 1. Shooting auxiliary mechanism; 101. Outer protective cover; 102. Lens; 103. Zoom ring; 104. Connecting seat; 105. Focus lens; 2. Shading mechanism; 201. Shading cover; 202. Connecting strip; 203. Limit block; 204. Connecting ring; 205. Guide strip; 206. Guide groove; 3. Protective mechanism; 301. Anti-slip ring; 302. Spring sheet; 303. Rubber ring; 304. Arc ring; 305. Outer protective ring; 306. Anti-slip strip; 307. Connecting tube; 4. Buffer mechanism; 401. Buffer arc plate; 402. Buffer sheet; 403. Mounting seat; 404. Buffer damping rod; 405. Spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1: Figure 1-Figure 8 As shown, the present invention provides a technical solution: a large aperture optical lens shooting aid, comprising a shooting aid mechanism 1, a shading mechanism 2 is arranged at one end of the shooting aid mechanism 1, a protective mechanism 3 is arranged at the other end of the shooting aid mechanism 1, a plurality of buffer mechanisms 4 are distributed on the outer wall of the shading mechanism 2, the shooting aid mechanism 1 comprises an outer protective cover 101, the shading mechanism 2 comprises a shading cover 201, a connecting ring 204 is connected to the inner side of the shading cover 201, the inner side of the connecting ring 204 is connected to the outer wall of the outer protective cover 101, and a plurality of connecting strips 202 and limiters are evenly distributed along the clockwise direction on the inner wall of the shading cover 201. The outer wall of the connecting ring 204 is evenly provided with a plurality of guide strips 205, and the outer wall of the outer protective cover 101 is evenly provided with a plurality of guide grooves 206, which are movably connected to the inner side of the connecting ring 204. A lens 102 is arranged at one end of the inner side of the outer protective cover 101, a zoom ring 103 is arranged in the middle of the outer wall of the outer protective cover 101, a connecting seat 104 is arranged at the other end of the outer protective cover 101, a focusing lens 105 is arranged at one end of the connecting seat 104, and a limiting ring is arranged on the outer side of the connecting ring 204, which is connected to the inner side of the sunshade 201.

[0030] In this embodiment, the outer protective cover 101 provides protection for the lens 102, the zoom ring 103 is arranged in the middle of the outer protective cover 101 to provide a zoom adjustment function, and the connecting seat 104 can provide an installation connection function, which is convenient for arranging the focus lens 105 and multiple lens groups inside, thereby providing an effective shooting function, and the sunshade 201 is connected to the outer protective cover 101 in conjunction with the connecting ring 204, so as to provide a telescopic adjustment function, which is convenient for adjustment according to the lighting environment used, and the shading area is effectively improved. The optical auxiliary shooting effect is effectively improved by the connecting strip 202, the guide strip 205 and the guide groove 206. It is helpful to provide a guiding function during the telescopic adjustment process, thereby improving the stability of use and achieving an efficient auxiliary shooting effect. When taking outdoor landscape photos, the photographer may need to shoot a wide scene. At this time, the sunshade can be retracted to the shortest state to avoid the sunshade blocking too much field of view. The sunshade can be extended to accurately control the incident angle of light, minimize the interference of the surrounding stray light on the close-up subject, highlight the subject details, and improve the picture texture. When photographers need to carry the auxiliary device when shooting, especially in hiking, mountaineering and other shooting activities that require the equipment to carry weight, the lens hood can be completely retracted to reduce the size of the entire auxiliary device, making it easier to store in a backpack, reducing the burden of carrying, and allowing photographers to create anytime, anywhere without being hindered by the large size of the equipment. The retractable lens hood can respond quickly according to the dynamic changes in light conditions.

[0031] Example 2: Figure 6 As shown, the protective mechanism 3 includes an anti-slip ring 301 and a connecting tube 307. A plurality of spring sheets 302 are evenly distributed on the inner wall of the anti-slip ring 301. A rubber ring 303 is arranged on the inner side of the anti-slip ring 301. The spring sheet 302 and the rubber ring 303 are both connected to the outer wall of the connecting tube 307. An arc ring 304 is fixedly connected to one side of the anti-slip ring 301. An outer protective ring 305 is sleeved on the outer wall of the anti-slip ring 301. A plurality of anti-slip strips 306 are evenly distributed on the outer wall of the outer protective ring 305.

[0032] In this embodiment, a plurality of spring sheets 302 are distributed inside the anti-slip ring 301, and the rubber ring 303 is connected to the outside, so as to provide a buffering protection effect. The arc ring 304 is conducive to further increasing the wrapping property. The outer protective ring 305 and the anti-slip strip 306 are arranged on the outermost side, so as to provide a protective effect, and thus to provide a further protective effect during the use of the lens, and to resist accidental collisions from all directions in daily use. Whether it is a slight bump caused by people coming and going at the shooting site, or a collision with other items during carrying and storage, the protective cover can absorb the impact force by its own elastic deformation, and avoid the damage and displacement of the internal precision components such as the micro laser transmitting and receiving device in the high-precision focus auxiliary module and the aperture blade driving motor in the strong light suppression shading component due to collision, so as to ensure that the auxiliary device always maintains a precise working state, which is conducive to extending the service life and preventing the problem of reduced service life due to falling.

[0033] Example 3: Figure 7 and Figure 8 As shown, the buffer mechanism 4 includes a buffer arc plate 401, a buffer sheet 402 is symmetrically connected to the inner side of the buffer arc plate 401, one end of the buffer sheet 402 is connected to a mounting seat 403, a buffer damping rod 404 is connected between the buffer arc plate 401 and the mounting seat 403, and the outer wall of the buffer damping rod 404 is sleeved with a spring 405, one end of the spring 405 is connected to the inner wall of the buffer arc plate 401, and the other end of the spring 405 is connected to the outer wall of the mounting seat 403.

[0034] In this embodiment, the buffer arc plate 401 and the mounting seat 403 are connected and supported by a buffer sheet 402. While being supported by the buffer sheet 402, it can provide an elastic support. It is supported by the buffer damping rod 404 and the spring 405, and provides a buffering and shock-absorbing effect, which is beneficial to provide elastic support, further providing a shock-absorbing and protective effect, and is beneficial to improving the use effect. The thickened treatment and the elastic buffer pad at the connection with the lens are key designs to protect the lens. On the one hand, the thickened edge can prevent the impact force from being directly transmitted to the lens during a collision, reducing the risk of damage to the lens housing. On the other hand, the elastic buffer pad provides buffering at the weak link between the auxiliary device and the lens, avoiding loose connection between the lens and the auxiliary device due to collision, and eliminating problems such as shaking of the shooting picture and inaccurate focus due to unstable connection. At the same time, it prevents the lens mount from being deformed and damaged under impact, thereby extending the service life of the lens.

[0035] In the present invention, when the large aperture optical lens shooting aid is in use, first, the outer shield 101 provides protection for the lens 102, and the zoom ring 103 is arranged in the middle of the outer shield 101 to provide a zoom adjustment function. The connecting seat 104 can provide an installation connection function, which is convenient for arranging the focus lens 105 and multiple lens groups inside, thereby providing an effective shooting function. The light shielding hood 201 cooperates with the connecting ring 204 and is connected to the outer shield 101, so as to provide a telescopic adjustment function, which is convenient for adjustment according to the lighting environment used, and the light shielding area, The effect of optical assisted shooting is effectively improved. The connecting strip 202, the guide strip 205 and the guide groove 206 are helpful to provide guidance during the telescopic adjustment process, thereby improving the stability of use and achieving a highly efficient assisted shooting effect. When taking outdoor landscape photos, the photographer may need to shoot a wide scene. At this time, the lens hood can be retracted to the shortest state to prevent the lens hood from blocking too much of the field of view. By extending the lens hood, the incident angle of light can be accurately controlled, minimizing the interference of ambient stray light on the close-up subject, highlighting the subject details and improving the picture texture.

[0036] There are several spring sheets 302 distributed inside the anti-slip ring 301, and they are connected to the outside with a rubber ring 303, which is conducive to providing a buffering protection effect. The arc ring 304 is conducive to further increasing the wrapping property. The outer protective ring 305 and the anti-slip strip 306 are arranged on the outermost side, which is conducive to providing a protective effect, and further providing a protective effect during the use of the lens, and resisting accidental collisions from all directions in daily use. Whether it is a slight bump caused by people coming and going at the shooting site, or a collision with other items during carrying and storage, the protective cover can absorb the impact force by its own elastic deformation, avoiding damage and displacement of internal precision components such as the micro laser transmitting and receiving device in the high-precision focus auxiliary module and the aperture blade drive motor in the strong light suppression shading component due to collision, ensuring that the auxiliary device always maintains a precise working state, which is conducive to extending the service life and preventing the problem of reduced service life due to falling.

[0037] The buffer arc plate 401 and the mounting seat 403 are connected and supported by a buffer sheet 402. While being supported by the buffer sheet 402, it can provide an elastic support. It is supported by the buffer damping rod 404 and the spring 405, and provides a buffering and shock-absorbing effect, which is beneficial to provide elastic support, further providing a shock-absorbing and protective effect, and is beneficial to improving the use effect. The thickened treatment and the elastic buffer pad at the connection with the lens are key designs to protect the lens. On the one hand, the thickened edge can prevent the impact force from being directly transmitted to the lens during a collision, reducing the risk of damage to the lens housing. On the other hand, the elastic buffer pad provides buffering at the weak link between the auxiliary device and the lens, avoiding loose connection between the lens and the auxiliary device due to collision, and eliminating problems such as shaking of the shooting picture and inaccurate focus due to unstable connection. At the same time, it prevents the lens mount from deformation and damage due to impact, thereby extending the service life of the lens.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large aperture optical lens shooting aid, comprising a shooting aid mechanism (1), characterized in that: A shading mechanism (2) is disposed at one end of the shooting auxiliary mechanism (1), a protective mechanism (3) is disposed at the other end of the shooting auxiliary mechanism (1), a plurality of buffer mechanisms (4) are distributed on the outer wall of the shading mechanism (2), the shooting auxiliary mechanism (1) comprises an outer protective cover (101), the shading mechanism (2) comprises a shading cover (201), a connecting ring (204) is connected to the inner side of the shading cover (201), and the inner side of the connecting ring (204) is connected to the outer protective cover (101). 01), a plurality of connecting strips (202) and limiting blocks (203) are evenly distributed in a clockwise direction on the inner wall of the light shield (201), the connecting strips (202) and limiting blocks (203) are staggered, a plurality of guide strips (205) are evenly distributed on the outer wall of the connecting ring (204), and a plurality of guide grooves (206) are evenly provided on the outer wall of the outer protective cover (101), and the guide grooves (206) are movably connected to the inner side of the connecting ring (204).

2. The large aperture optical lens shooting aid according to claim 1, characterized in that: The protection mechanism (3) comprises an anti-slip ring (301) and a connecting tube (307); a plurality of spring sheets (302) are evenly distributed around the inner wall of the anti-slip ring (301); a rubber ring (303) is arranged on the inner side of the anti-slip ring (301); and both the spring sheet (302) and the rubber ring (303) are connected to the outer wall of the connecting tube (307).

3. The large aperture optical lens shooting aid according to claim 1, characterized in that: The buffer mechanism (4) comprises a buffer arc plate (401), the inner side of the buffer arc plate (401) is symmetrically connected to a buffer sheet (402), and one end of the buffer sheet (402) is connected to a mounting seat (403).

4. The large aperture optical lens shooting aid according to claim 2, characterized in that: An arc-shaped ring (304) is fixedly connected to one side of the anti-slip ring (301), an outer protective ring (305) is sleeved on the outer wall of the anti-slip ring (301), and a plurality of anti-slip strips (306) are evenly distributed on the outer wall of the outer protective ring (305).

5. The large aperture optical lens shooting aid according to claim 3, characterized in that: A buffer damping rod (404) is connected between the buffer arc plate (401) and the mounting seat (403); a spring (405) is sleeved on the outer wall of the buffer damping rod (404); one end of the spring (405) is connected to the inner wall of the buffer arc plate (401); and the other end of the spring (405) is connected to the outer wall of the mounting seat (403).

6. The large aperture optical lens shooting aid according to claim 1, characterized in that: A lens (102) is arranged at one end of the inner side of the outer protective cover (101), and a zoom ring (103) is arranged at the middle of the outer wall of the outer protective cover (101).

7. The large aperture optical lens shooting aid according to claim 1, characterized in that: The other end of the outer protective cover (101) is provided with a connecting seat (104), and one end of the connecting seat (104) is provided with a focusing lens (105).

8. The large aperture optical lens shooting aid according to claim 1, characterized in that: A limiting ring is arranged on the outer side of the connecting ring (204), and the limiting ring is connected to the inner side of the light shield (201).

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