A 2G2P wide-angle lens and its highly sealed structure

Abstract

The present invention provides a 2G2P wide-angle lens and its highly sealed structure, which includes: a lens assembly, sequentially including a first lens, a second lens, a third lens, and a fourth lens, and both end surfaces of the lens assembly are respectively fitted and sleeved with a locking assembly and a pressing assembly. By using the wide-angle lens and its sealing structure of the present invention, the IP6K9K protection level standard can be achieved.

Description

Technical Field

[0001] The present invention relates to a 2G2P wide-angle lens and its high-sealing structure, belonging to the technical field of wide-angle lenses. Background Art

[0002] A wide-angle lens is a photographic lens with a focal length shorter than that of a standard lens, a viewing angle larger than that of a standard lens, a focal length longer than that of a fish-eye lens, and a viewing angle smaller than that of a fish-eye lens; wide-angle lenses are divided into two types: ordinary wide-angle lenses and ultra-wide-angle lenses. The focal length of an ordinary wide-angle lens for a 135 camera is generally 38 - 24 mm, and the viewing angle is 60 - 84 degrees; the focal length of an ultra-wide-angle lens is 20 - 13 mm, and the viewing angle is 94 - 118 degrees. Since the wide-angle lens has a short focal length and a large viewing angle, within a short shooting distance range, it can capture a large area of scenery; the biggest feature of the wide-angle lens is that it can capture a wide range, with shooting features such as exaggerating the sense of distance and having a wide focus range. When using this type of lens, the objects in front can be magnified and the distant objects can be reduced. It is also a major feature that the images around are prone to distortion. The wide-angle lens can also adjust any point in the image to the most appropriate focal length, making the picture clearer, which can also be called full automatic focusing. In addition, when using this type of lens for shooting, there are defects such as perspective, distortion, and image aberration in the picture. The shorter the focal length of the lens and the closer the shooting distance, the more significant these defects are. Therefore, when shooting portraits, it is not advisable to be closer than 0.6 meters to avoid perspective distortion. When shooting standard portrait photos for documents with an ordinary wide-angle lens to avoid perspective distortion, it is best to take a half-waist or knee-length image; when using an ultra-wide-angle lens to shoot such portrait photos, it is best to take a full-body image and then crop it during the enlargement process. Sometimes when shooting portraits, to mitigate certain defects on the subject's face, this perspective distortion can also be consciously utilized. For example, if the subject has a narrow forehead and a wide lower jaw, shooting from a slightly higher overhead angle can offset the defects; conversely, a low-angle upward shot can be used.

[0003] A wide-angle lens is also called a short lens and is a type of photographic auxiliary lens. When assembling a wide-angle lens, a stamping lock cover is usually used, and black glue and UV glue are used to achieve the sealing effect. However, during actual assembly, the black glue may not be filled densely enough between the lens and the end cover due to the stamping lock cover. Even due to defects caused by stamping, gaps may occur in the filling position of the black glue, resulting in a reduced sealing effect. Especially when applied to underwater or places with high sealing requirements, the protective performance of the lens cannot be ensured, which may cause water vapor to enter and make the lens surface blurred, affecting the shooting effect. Moreover, during the assembly process, it is necessary to ensure both the convenience and stability of assembly and the sealing performance after assembly, which affects the assembly accuracy, increases the processing difficulty, and reduces the qualified rate of wide-angle lens production.

[0004] For example, Chinese Patent Document CN112558279A discloses a high-definition wide-angle lens, which includes a lens barrel. Inside the lens barrel, a first lens, a second lens, a third lens, and a fourth lens are sequentially installed from the object side to the image side. The first lens and the second lens are glass lenses. The concave surface of the first lens faces the image side and has a negative optical power. The second lens is a biconvex lens and has a positive optical power. A filter is provided on the image side of the fourth lens. The third lens and the fourth lens are glued together to form a combined lens. The third lens and the fourth lens are plastic aspherical lenses. The third lens is a biconvex lens and has a positive optical power. The concave surface of the fourth lens faces the object side and has a negative optical power. This wide-angle lens has the advantages of high resolution, long working distance, and wide working temperature range, but its sealing performance needs to be improved.

[0005] For example, Chinese Patent Document CN115480380B discloses a 2G4P wide-angle lens, Chinese Patent Document CN115629467A discloses a 3G3P wide-angle lens, Chinese Patent CN115657276A discloses a 5G2P wide-angle lens, etc. Their high definition is at the leading level in China, but their sealing performance needs to be further improved.

[0006] In the prior art, there is an urgent need for a technical solution for a wide-angle lens that can provide high definition and high resolution and its high-sealing structure. Summary of the Invention

[0007] In view of the technical problems existing in the prior art, the present invention aims to provide a technical solution for assembling a wide-angle lens and its high-sealing structure that can solve the problems of high resolution and high sealing performance of a 2G2P wide-angle lens.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] According to one aspect of the present invention, a 2G2P wide-angle lens is provided, which is characterized in that it sequentially includes, from the object side to the image side along the optical axis: a fourth lens, a third lens, a diaphragm, a second lens, and a first lens; the fourth lens has a negative optical power, its object side surface is a bent plane, its image side surface is a concave surface with a curvature radius of 1.87 mm, and its refractive index is 1.59; the third lens has a positive optical power, its object side surface is a plano-convex surface with a curvature radius of 11.92 mm, its image side surface is a convex surface with a curvature radius of 4.19 mm, and its refractive index is 1.697; the diaphragm is installed on the object side surface of the second lens, the object side surface of the first lens and the image side surface of the second lens are glued to form a combined lens, the second lens has a negative optical power, its object side surface is a convex surface with a curvature radius of 5.15 mm, its image side surface is a concave surface with a curvature radius of 1.75 mm, and its refractive index is 1.65; the first lens has a positive optical power, its object side surface is a convex surface with a curvature radius of 1.75 mm, its image side surface is a convex surface with a curvature radius of 8.03 mm, and its refractive index is 1.534.

[0010] Furthermore, the first lens and the second lens are made of plastic material, the third lens and the fourth lens are made of glass material, and the diaphragm is made of a high-light-shielding material with a 6.0 mm 3.92 mm aperture and is installed at a 45° oblique angle on the object side surface of the second lens.

[0011] Furthermore, the 2G2P wide-angle lens further includes:

[0012] a lens assembly, which includes a lens housing, and both ends of the surface are respectively fitted and sleeved with a locking assembly and a pressing assembly;

[0013] The locking assembly is composed of an end cap. There is a black glue layer filled between the end cap and the lens housing, and an inner ring body is provided at the edge of the inner wall of the end cap at the bottom of the black glue layer. A tensioning mechanism is threadedly sleeved on the surface of the lens housing;

[0014] The pressing assembly includes a gland, the gland is threadedly sleeved on the surface of the lens housing, and the edge of the gland is fitted and connected with the tensioning mechanism.

[0015] Furthermore, the lens housing is made of a metal material with an annular structure. The first lens, the second lens, and the third lens are respectively embedded in the lens housing. The first lens is close to the pressing assembly side and is lapped on the inner wall of the lens housing. The first lens and the second lens are glued and bonded to each other, and a first limiting ring is provided between the second lens and the third lens, and the first limiting ring is fitted and sleeved with the inside of the lens housing.

[0016] Further, one side of the third lens abuts against the edge of the first limiting ring, the first limiting ring is adhesively connected to the edge of the second lens, the other side of the third lens is adhesively connected to the second limiting ring, the second limiting ring is adhesively connected to the bottom surface of the third limiting ring, and both the second limiting ring and the third limiting ring are fitted and sleeved inside the lens housing. The top surface of the third limiting ring is adhesively connected to the fourth lens, and the third limiting ring is arranged inside the top end of the lens housing with a wider diameter.

[0017] Further, the bottom edge of the fourth lens is fitted and connected to the sealing ring, the sealing ring is embedded inside the top end of the lens housing, the diameter of the fourth lens is larger than that of the third lens, and the top edge of the fourth lens is hermetically fitted to the end cap.

[0018] According to another aspect of the present invention, there is provided a high-sealing structure for a 2G2P wide-angle lens, which is characterized in that it includes a locking assembly and the pressing assembly.

[0019] The locking assembly is composed of an end cap. There is a black glue layer filled between the end cap and the lens housing, and an inner ring body is provided at the edge of the inner wall of the end cap at the bottom of the black glue layer. A tensioning mechanism is threadedly sleeved on the surface of the lens housing.

[0020] A pressure ring is fixedly connected to the edge of the inner wall of the end cap. The pressure ring is adhesively connected to the top edge of the lens housing. There is a black glue layer filled between the pressure ring and the inner ring body, and the black glue layer is located between the lens housing and the end cap. The end cap is stamping-sleeved on the surface of the lens housing. The cross-section of the inner ring body is a U-shaped structure and contacts the bottom surface of the glue layer. The number of the inner ring bodies is two, and a bayonet is formed inside the end cap between the two inner ring bodies.

[0021] Further, the inner wall of the inner ring body is fitted and snap-connected to a block. The width of the block is the same as the width of the bayonet for the movement of the block. The top end of the block is an L-shaped structure and is located inside the inner ring body. The bottom end of the block is fitted and slidably connected to the inside of the tensioning mechanism.

[0022] Further, the tensioning mechanism includes a movable ring. The inner wall of the bottom end of the movable ring is threadedly connected to the lens housing. One side of the movable ring has a U-shaped cross-section, and a block is slidably connected inside the movable ring. A card slot corresponding to the block is provided inside the inner ring body. After the block moves, the block is fitted and snap-connected to the inside of the card slot. Magnets are fixedly connected to the outer wall of the bottom of the block and the inner wall of the movable ring in a corresponding distribution.

[0023] Further, the pressing assembly includes a gland, the gland is threadedly sleeved on the surface of the lens housing, and the edge of the gland is fitted and connected to the tensioning mechanism; a notch that fits the lens housing is formed at the top of the gland, the bottom of the abutting rod is fitted and connected to the inside of the notch, and when the gland is tightened, the gland is in contact with the bottom of the movable ring. A washer is fixedly connected to the inside of the bottom end of the gland, the washer is fitted and connected to the inside of the bottom end of the lens housing, a groove for filling the UV glue layer of the glass sheet is provided at the bottom of the lens housing, the UV glue layer of the glass sheet is bonded to the edge of the glass sheet, and the glass sheet is in contact with the bottom edge of the lens housing. The inner edge of the gland is in contact with the glass sheet for pressing and fixing the glass sheet.

[0024] Further, a plugging mechanism is provided at the bottom of the end cap. The plugging mechanism includes a plug block. The width of the plug block is the same as that of the clamping block. The plug block is fitted and inserted into the bayonet, and an arc surface that fits the black glue layer is formed at the top of the plug block. Both sides of the bottom of the plug block are fixedly connected to a first baffle and a second baffle respectively. Both the first baffle and the second baffle are annular structures, and both the first baffle and the second baffle are in contact with the bottom surfaces of the end cap and the inner ring body.

[0025] Further, a notch and a jack are respectively formed at the top and bottom of the movable ring. A resisting rod is fitted and inserted into the jack. The resisting rod is embedded in the jack, and the resisting rod is in contact with the surface of the lens housing. The cross section of the resisting rod is an L-shaped structure. The top of the resisting rod is in contact with the first baffle, and the outer wall of the movable ring is fixed to the resisting rod by screws. The number of the resisting rods is several, and several resisting rods are evenly distributed around the lens housing, and the resisting rods and the clamping blocks are staggered.

[0026] According to the present invention, the provided 2G2P wide-angle lens adopts a combination of glass and plastic and reasonably sets the optical power of each lens. Therefore, while the focal length ratio of the wide-angle lens to the focal length of the first lens is within a wide range, it can ensure that the deviation of the optical power within a wide temperature range is extremely low, and high imaging clarity can be ensured.

[0027] According to the present invention, since the diaphragm in the present invention uses a high light-shielding material developed by SOMA Company of Japan, it can greatly ensure the flatness of the light-shielding surface. Due to the 45-degree bevel installation, it can further ensure that the light passing through the diaphragm will not produce phenomena such as reflection and halo. Since the feature of the present invention lies in the combination of lens surfaces with specific curvature radii polished along the optical axis direction, therefore, not too much description is made on this diaphragm in the present invention, and it is not shown in the drawings either.

[0028] According to the present invention, since the assembly of the lens housing, the end cap and the gland is adopted to realize the assembly of the wide-angle lens, the sealing performance of each structural position is realized during the assembly. After the end cap is stamped and locked, the black glue layer is filled and compacted. Then, through the cooperation of the clamping blocks, the end cap and the lens housing are pressed tightly to ensure the stability after assembly. The plugging mechanism is used to realize the pressing and limiting after the filling of the black glue layer, ensuring the filling and sealing of each position. While the pressing component is fixed, the limiting of the plugging mechanism is realized. At the same time, the pressing component realizes the assembly and sealing of the glass sheet, realizes the assembly and sealing at both ends of the lens component, and realizes the pressing and filling of the black glue through the cooperation after the assembly at both ends of the lens, improving the sealing performance. At the same time, the overall performance of the lens appearance can be ensured, and the assembly effect and high sealing performance of the wide-angle lens can be improved.

[0029] According to the present invention, since the surfaces at both ends of the lens component are respectively fitted and sleeved with the locking component and the pressing component, by adopting the wide-angle lens and its sealing structure of the present invention, the IP6K9K protection level standard can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic perspective view of the overall three-dimensional structure of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0031] Figure 2 It is a schematic perspective view of the half-section of the lens component of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0032] Figure 3 It is a schematic perspective view of the half-section of the movable ring of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0033] Figure 4 It is a schematic perspective view of the 2G2P wide-angle lens after the clamping blocks are moved according to a specific embodiment of the present invention.

[0034] Figure 5 It is a schematic perspective view of the inner ring body of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0035] Figure 6 It is a front view of the internal structure of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0036] Figure 7 It is a side view of the internal structure of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0037] Figure 8 It is a schematic view of the appearance of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0038] Figure 9Schematic diagram of the three-dimensional structure at the abutting rod of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0039] Figure 10 Schematic diagram of the external front view structure at the movable ring and the inner ring body of the 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0040] Description of the reference numerals

[0041] 100, lens assembly; 101, lens housing; 102, first lens; 103, second lens; 104, first limiting ring; 105, third lens; 106, second limiting ring; 107, third limiting ring; 108, fourth lens; 109, sealing ring;

[0042] 200, locking assembly; 201, end cap; 202, pressure ring; 203, black glue layer; 204, inner ring body; 205, bayonet; 206, block; 207, movable ring; 208, card slot; 209, plug block; 210, first baffle; 211, second baffle; 212, arc surface; 213, notch; 214, jack; 215, abutting rod; 216, screw; 217, magnet;

[0043] 300, pressing assembly; 301, pressing cover; 302, washer; 303, notch; 304, glass sheet; 305, glass sheet UV glue layer. Specific embodiment

[0044] The present invention will be further described in detail below with reference to the accompanying drawings in conjunction with specific embodiments, but this description is exemplary, and the present invention is not limited to the scope of the specific embodiments described.

[0045] Figure 1 Schematic diagram of the overall three-dimensional structure of the 2G2P wide-angle lens according to a specific embodiment of the present invention, Figure 2 is a half-sectional view.

[0046] As Figure 1 、 2As shown, the 2G2P wide-angle lens includes a lens assembly 100, a locking assembly 200, and a pressing assembly 300, which successively include, along the optical axis from the object side to the image side: a fourth lens 108, a third lens 105, a diaphragm, a second lens 103, and a first lens 102; the fourth lens 108 has a negative focal power, its object side is a curved plane, its image side is a concave surface with a curvature radius of 1.87 mm, and the refractive index is 1.59; the third lens 105 has a positive focal power, its object side is a plano-convex surface with a curvature radius of 11.92 mm, its image side is a convex surface with a curvature radius of 4.19 mm, and the refractive index is 1.697; the diaphragm is installed on the object side surface of the second lens 103, the object side surface of the first lens 102 and the image side surface of the second lens 103 are glued to form a combined lens, the second lens 103 has a negative focal power, its object side is a convex surface with a curvature radius of 5.15 mm, its image side is a concave surface with a curvature radius of 1.75 mm, and the refractive index is 1.65; the first lens 102 has a positive focal power, its object side is a convex surface with a curvature radius of 1.75 mm, its image side is a convex surface with a curvature radius of 8.03 mm, and the refractive index is 1.534. The first lens (102) and the second lens (103) are made of plastic material, the third lens (105) and the fourth lens (108) are made of glass material, and the diaphragm is made of a 6.0 mm 3.92 mm high-light-shielding material with a 0.03 mm aperture and is installed at a 45° oblique angle on the object side surface of the second lens (103).

[0047] In the present invention, the lens group combination diagram and the optical path diagram of the wide-angle lens along the optical axis direction are not given, but only the assembly diagrams of each optical part and the mechanical structure are given. The applicant believes that the wide-angle lenses in this application and other applications of the applicant can all solve the problem of high-definition resolution. The differences are only the refractive indices, focal powers, and curvature radii of each surface type of 2G2P. Due to these differences, each wide-angle lens is used in different scenarios according to its own characteristics and advantages, such as automobiles, ships, mobile phone terminals, military products, etc. Therefore, the wide-angle lenses described in Chinese patents CN112558279A, CN115480380B, CN115629467A, and CN115657276A are incorporated herein by reference, and this article is also a series application of them, and even a solution to further solve the sealing problem of these wide-angle lenses.

[0048] Such as Figures 1 - 10As shown, the lens assembly 100 is composed of a lens housing 101. A number of lens structures are embedded inside the lens housing 101, and both ends of the lens assembly 100 are respectively fitted and sleeved with a locking assembly 200 and a pressing assembly 300; the locking assembly 200 is composed of an end cap 201. A black glue layer 203 is filled between the end cap 201 and the lens housing 101, and an inner ring 204 is provided at the inner wall edge of the end cap 201 at the bottom of the black glue layer 203. A tensioning mechanism is threadedly sleeved on the surface of the lens housing 101; the pressing assembly 300 includes a gland 301, which is threadedly sleeved on the surface of the lens housing 101, and the edge of the gland 301 is in fit connection with the tensioning mechanism.

[0049] The lens housing 101 is made of a metal material with an annular structure. A first lens 102, a second lens 103, and a third lens 105 are respectively embedded inside the lens housing 101. The first lens 102 is close to the pressing assembly 300 and lapped on the inner wall of the lens housing 101. The first lens 102 and the second lens 103 are in mutual fit connection. A first limiting ring 104 is provided between the second lens 103 and the third lens 105, and the first limiting ring 104 is fitted and sleeved inside the lens housing 101; one side of the third lens 105 is lapped with the edge of the first limiting ring 104, the first limiting ring 104 is in fit connection with the edge of the second lens 103, the other side of the third lens 105 is in fit connection with a second limiting ring 106, the second limiting ring 106 is in fit connection with the bottom surface of a third limiting ring 107, and both the second limiting ring 106 and the third limiting ring 107 are fitted and sleeved inside the lens housing 101. The top surface of the third limiting ring 107 is in fit connection with a fourth lens 108. The third limiting ring 107 is arranged inside the top end of the lens housing 101 with a wider diameter; the bottom edge of the fourth lens 108 is in fit connection with a sealing ring 109, and the sealing ring 109 is embedded inside the top end of the lens housing 101. The diameter of the fourth lens 108 is larger than that of the third lens 105, and the top edge of the fourth lens 108 is in sealing fit with the end cap 201.

[0050] In this technical solution, the first lens 102 and the second lens 103 are sequentially placed inside the lens housing 101. After the first limiting ring 104 is installed inside the lens housing 101, the third lens 105 is placed in the same way. Then, the second limiting ring 106 and the third limiting ring 107 are sequentially installed inside the lens housing 101. At this time, the fourth lens 108 is installed at the top of the lens housing 101 to press the sealing ring 109 to achieve the seal between the edge of the wide-angle lens and the lens housing 101. After assembly, the end cap 201 is stamped and locked.

[0051] As Figures 3 - 5As shown, the edge of the inner wall of the end cap 201 is fixedly connected to the pressing ring 202. The pressing ring 202 is fitted and connected to the top edge of the lens housing 101. A black glue layer 203 is filled between the pressing ring 202 and the inner ring body 204, and the black glue layer 203 is located between the lens housing 101 and the end cap 201. The end cap 201 is stamping-sleeved on the surface of the lens housing 101. The cross-section of the inner ring body 204 is a U-shaped structure and contacts the bottom surface of the glue layer. The number of the inner ring bodies 204 is two, and a bayonet 205 located inside the end cap 201 is formed between the two inner ring bodies 204. The inner wall of the inner ring body 204 is fitted and clamped with a clamping block 206. The width of the clamping block 206 is the same as the width of the bayonet 205 for the movement of the clamping block 206. The top end of the clamping block 206 is an L-shaped structure and is located inside the inner ring body 204. The bottom end of the clamping block 206 is fitted and slid inside the tensioning mechanism. The tensioning mechanism includes a movable ring 207. The inner wall of the bottom end of the movable ring 207 is threadedly connected to the lens housing 101. One side cross-section of the movable ring 207 is a U-shaped structure, and a clamping block 206 is slidably connected inside the movable ring 207. A clamping groove 208 corresponding to the clamping block 206 is formed inside the inner ring body 204. After the clamping block 206 moves, the clamping block 206 is fitted and clamped inside the clamping groove 208. Magnets 217 are fixedly connected to the outer wall of the bottom of the clamping block 206 and the inner wall of the movable ring 207 in a corresponding distribution.

[0052] In this technical solution, after the black glue layer 203 is coated on the surface of the lens housing 101 and the inner wall of the end cap 201, the end cap 201 is stamping-locked by a stamping device. At this time, the pressing ring 202 is driven to press tightly on the edge of the lens housing 101 to achieve the sealing of the connection part. At the same time, the black glue layer 203 is filled between the end cap 201 and the lens housing 101 under the pressing ring 202. After assembly, the black glue is continuously filled from the gap between the inner ring body 204 and the lens housing 101. Before filling, the movable ring 207 is rotated. The upward movement of the movable ring 207 drives the clamping block 206 to insert from the bayonet 205, and the clamping block 206 inside the movable ring 207 is rotated at this time. After the magnets 217 that cooperate with the clamping block 206 are separated, the clamping block 206 rotates to the position of the clamping groove 208. At this time, the clamping block 206 falls by gravity into the clamping groove 208. When the movable ring 207 is rotated in the reverse direction, the clamping block 206 is limited by the clamping groove 208. When the movable ring 207 rotates downward, the clamping block 206 is driven to move downward, so that the clamping block 206 pulls the inner ring body 204 and the end cap 201 to move downward, ensuring the pressing force between the end cap 201 and the top of the lens housing 101 and avoiding the loosening problem of its structure caused by long-term use.

[0053] As Figures 5 - 10As shown, a plugging mechanism is provided at the bottom of the end cap 201. The plugging mechanism includes a plug block 209. The width of the plug block 209 is the same as that of the clamping block 206. The plug block 209 is fitted and inserted into the inside of the bayonet 205. An arc surface 212 that fits with the black glue layer 203 is provided at the top of the plug block 209. Both sides of the bottom of the plug block 209 are fixedly connected to a first baffle 210 and a second baffle 211 respectively. Both the first baffle 210 and the second baffle 211 are annular structures, and both the first baffle 210 and the second baffle 211 are in fit connection with the bottom surface of the end cap 201 and the inner ring body 204; notches 213 and insertion holes 214 are respectively provided at the top and bottom of the movable ring 207. A resisting rod 215 is fitted and inserted into the inside of the insertion hole 214. The resisting rod 215 is embedded in the insertion hole 214, and the resisting rod 215 is in fit connection with the surface of the lens housing 101. The cross section of the resisting rod 215 is an L-shaped structure. The top of the resisting rod 215 is in fit connection with the first baffle 210, and the outer wall of the movable ring 207 is fixedly connected to the resisting rod 215 by screws 216. The number of the resisting rods 215 is several. The several resisting rods 215 are evenly distributed around the lens housing 101, and the resisting rods 215 and the clamping blocks 206 are staggered.

[0054] In this technical solution, after the end cap 201 is tightened and limited by the locking assembly 200, at this time, black glue is continuously filled to form the structure of the black glue layer 203. Then, the plug block 209 is fitted into the inside of the bayonet 205. At this time, the plug block 209 drives the first baffle 210 and the second baffle 211 to fit on the bottom edges of the end cap 201 and the inner ring body 204, thereby realizing the plugging after the black glue is filled, and then the assembly of the gland 301 is carried out.

[0055] A notch 303 that fits with the lens housing 101 is provided at the top of the gland 301. The inside of the notch 303 is in fit connection with the bottom of the resisting rod 215. When the gland 301 is tightened, the gland 301 is in fit connection with the bottom of the movable ring 207. A washer 302 is fixedly connected to the inside of the bottom end of the gland 301. The washer 302 is in fit connection with the inside of the bottom end of the lens housing 101. A groove for filling the UV glue layer 305 of the glass sheet 304 is provided at the bottom of the lens housing 101. The UV glue layer 305 of the glass sheet 304 is bonded to the edge of the glass sheet 304, and the glass sheet 304 is in fit connection with the bottom edge of the lens housing 101. The inner edge of the gland 301 is in fit connection with the glass sheet 304 for pressing and fixing the glass sheet 304.

[0056] In this technical solution, when the movable ring 207 rotates, since the gland 301 has not been assembled yet, at this time, the abutting rod 215 falls due to gravity and abuts on the top edge of the movable ring 207, and at the same time, it does not affect the rotation of the movable ring 207. After the movable ring 207 is rotated downward and the end cover 201 is tightened, the plug 209 is fitted inside the bayonet 205. At this time, the gland 301 is installed. The gland 301 rotates and pushes the abutting rod 215 upward, so that the abutting rod 215 moves upward inside the notch 213 and the jack 214, and the top of the abutting rod 215 pushes the first baffle 210 upward, so that the first baffle 210 and the second baffle 211 are pressed against the bottom surface of the end cover 201 and the inner ring body 204, and drives the plug 209 to be fitted inside the bayonet 205, so that the arc surface 212 at the top of the plug 209 is in contact with the black glue layer 203 to realize the pressing and sealing of the black glue layer 203. When the gland 301 is installed in place, it is in contact with the bottom surface of the movable ring 207 to improve the integrity after the lens is assembled. At the same time, the gland 301 drives the washer 302 to be fitted on the bottom edge of the lens housing 101. Before the gland 301 is installed, the glass sheet 304 and the UV glue layer 305 are filled in the bottom groove. After the glass sheet 304 is assembled, the gland 301 is installed. At the same time, the gland 301 presses the glass sheet 304, thereby forming the glass sheet 304 and the UV glue layer 305, and at the same time ensuring the pressing of the glass sheet 304 and the sealing performance of the connection position. At this time, the gland 301 and the movable ring 207 are both limited and fixed, which improves the stability of the assembled wide-angle lens and also ensures the sealing performance of the assembled position.

[0057] According to the present invention, since a combination of glass and plastic is adopted and the optical powers of the respective lenses are reasonably set, it is possible to satisfy that the focal length ratio of the wide-angle lens to the focal length of the first lens is in a wide range, while ensuring that the deviation of the optical power in a wide temperature range is extremely low, and it is possible to ensure high imaging clarity.

[0058] According to the present invention, since the assembly of the lens housing, the end cover and the gland is adopted to realize the assembly of the wide-angle lens, the sealing performance of each structural position is realized during the assembly, the assembly and sealing of both ends of the lens assembly are realized, and the pressing and filling of the black glue are realized through the cooperation after the assembly of both ends of the lens, so as to improve the sealing performance. At the same time, the overall performance of the lens appearance can be ensured, and the assembly effect and high sealing performance of the wide-angle lens can be improved.

[0059] According to the present invention, since the two ends of the lens assembly are respectively fitted and sleeved with the locking assembly and the pressing assembly, the IP6K9K protection level standard can be achieved.

[0060] The above has made a detailed description of the present invention with reference to specific embodiments. However, the present invention is not limited to the above embodiments. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but such changes and modifications should all fall within the protection scope of the present invention. The protection scope of the present invention is defined by the appended claims.

Claims

1. A 2G2P wide-angle lens, characterized in that, It sequentially includes, from the object side to the image side along the optical axis: a fourth lens (108), a third lens (105), a diaphragm, a second lens (103), and a first lens (102); the fourth lens (108) has a negative optical power, its object side surface is a bent plane, its image side surface is a concave surface with a curvature radius of 1.87 mm, and the refractive index is 1.59; the third lens (105) has a positive optical power, its object side surface is a plano-convex surface with a curvature radius of 11.92 mm, its image side surface is a convex surface with a curvature radius of 4.19 mm, and the refractive index is 1.697; the diaphragm is installed at the object side surface of the second lens (103), the object side surface of the first lens (102) and the image side surface of the second lens (103) are glued to form a combined lens, the second lens (103) has a negative optical power, its object side surface is a convex surface with a curvature radius of 5.15 mm, its image side surface is a concave surface with a curvature radius of 1.75 mm, and the refractive index is 1.65; the first lens (102) has a positive optical power, its object side surface is a convex surface with a curvature radius of 1.75 mm, its image side surface is a convex surface with a curvature radius of 8.03 mm, and the refractive index is 1.534; It includes a locking component (200) and a pressing component (300), the locking component (200) consists of an end cap (201), a black glue layer (203) is filled between the end cap (201) and the lens housing (101), and an inner ring body (204) is provided at the inner wall edge of the end cap (201) at the bottom of the black glue layer (203), and a tensioning mechanism is threadedly sleeved on the surface of the lens housing (101); A pressure ring (202) is fixedly connected to the inner wall edge of the end cap (201), the pressure ring (202) is in fit connection with the top edge of the lens housing (101), a black glue layer (203) is filled between the pressure ring (202) and the inner ring body (204), and the black glue layer (203) is located between the lens housing (101) and the end cap (201), the end cap (201) and the lens housing (101) are stamping-sleeved on the surface, the cross section of the inner ring body (204) is a U-shaped structure and is in contact with the bottom surface of the glue layer, the number of the inner ring bodies (204) is two, and a bayonet (205) located inside the end cap (201) is formed between the two inner ring bodies (204); The pressing component (300) includes a pressure cover (301), the pressure cover (301) is threadedly sleeved on the surface of the lens housing (101), and the edge of the pressure cover (301) is in fit connection with the tensioning mechanism; A notch (303) that fits the lens housing (101) is provided at the top of the gland (301). The inside of the notch (303) is fitted and connected to the bottom of the abutting rod (215). When the gland (301) is tightened, the gland (301) is in close contact with the bottom of the movable ring (207). A gasket (302) is fixedly connected inside the bottom end of the gland (301). The gasket (302) is fitted and connected to the inside of the bottom end of the lens housing (101). A groove for filling the UV glue layer (305) of the glass sheet (304) is provided at the bottom of the lens housing (101). The UV glue layer (305) of the glass sheet (304) is bonded to the edge of the glass sheet (304), and the glass sheet (304) is in close contact with the edge of the bottom end of the lens housing (101). The inner edge of the gland (301) is in close contact with the glass sheet (304) for pressing and fixing the glass sheet (304).

2. The 2G2P wide-angle lens according to claim 1, wherein The first lens (102) and the second lens (103) are made of plastic, and the third lens (105) and the fourth lens (108) are made of glass. The diaphragm has a size of 6.0 mm 3.92 mm A high-shielding material with a 0.03 mm aperture is installed on the object side surface of the second lens (103) at a 45° oblique angle.

3. The 2G2P wide-angle lens according to claim 1 or 2, characterized in that, It further includes: A lens assembly (100), the lens assembly (100) includes a lens housing (101), and both ends of the surface are respectively fitted and sleeved with a locking assembly (200) and a pressing assembly (300); The locking assembly (200) is composed of an end cap (201). A black glue layer (203) is filled between the end cap (201) and the lens housing (101). An inner ring body (204) is provided at the inner wall edge of the end cap (201) at the bottom of the black glue layer (203). A tensioning mechanism is threadedly sleeved on the surface of the lens housing (101); The pressing assembly (300) includes a gland (301). The gland (301) is threadedly sleeved on the surface of the lens housing (101), and the edge of the gland (301) is in close contact with the tensioning mechanism.

4. The 2G2P wide-angle lens according to claim 3, wherein: The lens housing (101) is made of a metal material with an annular structure. A first lens (102), a second lens (103), and a third lens (105) are respectively embedded in the lens housing (101). The first lens (102) is close to the pressing assembly (300) and overlaps on the inner wall of the lens housing (101). The first lens (102) and the second lens (103) are bonded to each other with glue. A first limiting ring (104) is provided between the second lens (103) and the third lens (105), and the first limiting ring (104) is fitted and sleeved inside the lens housing (101).

5. The 2G2P wide-angle lens according to claim 4, wherein: One side of the third lens (105) is lapped with the edge of the first limiting ring (104), the first limiting ring (104) is adhesively connected with the edge of the second lens (103), the other side of the third lens (105) is adhesively connected with the second limiting ring (106), the second limiting ring (106) is adhesively connected with the bottom surface of the third limiting ring (107), and both the second limiting ring (106) and the third limiting ring (107) are fitted and sleeved inside the lens housing (101). The top surface of the third limiting ring (107) is adhesively connected with the fourth lens (108), and the third limiting ring (107) is arranged inside the top end of the wider diameter of the lens housing (101).

6. The 2G2P wide-angle lens according to claim 5, wherein: The bottom edge of the fourth lens (108) is fitted and connected with the sealing ring (109), the sealing ring (109) is fitted inside the top end of the lens housing (101), the diameter of the fourth lens (108) is larger than that of the third lens (105), and the top edge of the fourth lens (108) is hermetically fitted with the end cap (201).

7. The 2G2P wide-angle lens according to claim 1, characterized in that: The inner wall of the inner ring body (204) is fitted and clamped with the clamping block (206). The width of the clamping block (206) is the same as that of the bayonet (205) for the movement of the clamping block (206). The top end of the clamping block (206) is of an L-shaped structure and is located inside the inner ring body (204), and the bottom end of the clamping block (206) is fitted and slid inside the tensioning mechanism.

8. The 2G2P wide-angle lens according to claim 7, wherein: The tensioning mechanism includes a movable ring (207). The inner wall of the bottom end of the movable ring (207) is threadedly connected with the lens housing (101). One side cross-section of the movable ring (207) is of a U-shaped structure, and a clamping block (206) is slidably connected inside the movable ring (207). A clamping groove (208) corresponding to the clamping block (206) is formed inside the inner ring body (204). After the clamping block (206) moves, the clamping block (206) is fitted and clamped inside the clamping groove (208). Magnets (217) corresponding to each other are fixedly connected to the outer wall of the bottom of the clamping block (206) and the inner wall of the movable ring (207).

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