2G2P wide-angle lens and high sealing structure thereof

Abstract

The invention provides a 2G2P wide-angle lens and a high sealing structure thereof, and the wide-angle lens comprises a lens assembly which sequentially comprises a first lens, a second lens, a third lens and a fourth lens, and the surfaces of the two ends of the lens assembly are respectively connected with a locking assembly and a pressing assembly in an embedded and sleeved manner. And the IP6K9K protection grade standard can be reached.

Description

Technical Field

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

[0002] A wide-angle lens is a photographic lens with a shorter focal length than a standard lens, a larger viewing angle than a standard lens, a longer focal length than a fisheye lens, and a smaller viewing angle than a fisheye 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. Due to the short focal length and large viewing angle of a wide-angle lens, a large area of ​​scenery can be captured within a relatively short shooting distance. The biggest feature of a wide-angle lens is that it can capture a wide range, and has the characteristics of exaggerating the sense of distance and having a wide focus range. When this type of lens is used, it can magnify objects in front of you and reduce objects in the distance. It is also a major feature that the images around you are easily distorted. A 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 fully automatic focus. In addition, when using this type of lens to shoot, the defects of perspective, deformation and image distortion are prone to appear in the picture. The shorter the focal length of the lens and the closer the shooting distance, the more obvious this defect is. Therefore, when shooting portraits, it is not advisable to get closer than 0.6 meters to avoid perspective distortion. In order to avoid perspective distortion when shooting with a wide-angle lens, when using an ordinary wide-angle lens to shoot standard portraits for ID cards, it is best to shoot half-waist or knee-length portraits; when using an ultra-wide-angle lens to shoot such portraits, it is best to shoot full-body portraits and then crop them during the zooming process. Sometimes when shooting portraits of people, in order to reduce certain defects on the subject's face, this perspective distortion can also be consciously used. For example, if the subject has a narrow forehead and a wide jaw, shooting from a slightly higher downward angle can offset the defects; otherwise, a low-angle upward shot can be used.

[0003] Wide-angle lens, also known as short lens, is a kind of photography auxiliary lens. When assembling wide-angle lens, stamping lock cover and black glue and UV glue are usually used to achieve sealing. However, in actual assembly, the black glue between the lens and the end cap may not be filled densely enough due to the stamping lock cover, and there may even be gaps in the black glue filling position due to defects caused by stamping, resulting in reduced sealing effect. Especially when used underwater or in places with high sealing requirements, the protective performance of the lens cannot be ensured, and water vapor may enter, blurring the mirror and affecting the shooting effect. In addition, during the assembly process, it is necessary to ensure the convenience and stability of assembly as well as the sealing after assembly, which affects the assembly accuracy, increases the difficulty of processing, and reduces the qualified rate of wide-angle lens production.

[0004] For example, Chinese patent document CN112558279A records a high-definition wide-angle lens, including a lens barrel, in which a first lens, a second lens, a third lens and a fourth lens are installed in sequence from the object side to the image side. The first lens and the second lens are glass lenses, and the concave surface of the first lens faces the image side, and has a negative optical focal length: the second lens is a double convex lens, and has a positive optical focal length; a filter is arranged on the image side of the fourth lens; the third lens and the fourth lens are glued together to form a combined lens, and the third lens and the fourth lens are plastic aspherical lenses, and the third lens is a double convex lens, and has a positive optical focal length: the concave surface of the fourth lens faces the object side, and has a negative optical focal length. The 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 records a 2G4P wide-angle lens, Chinese patent document CN115629467A records a 3G3P wide-angle lens, Chinese patent CN115657276A records a 5G2P wide-angle lens, etc. Their high definition is at the domestic leading level, but their sealing needs to be further improved.

[0006] The prior art urgently needs a technical solution for a wide-angle lens capable of providing high-definition and high-resolution images and a highly sealed structure thereof. 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 wide-angle lens assembly and its high sealing structure that can solve the problems of high resolution and high sealing performance of 2G2P wide-angle lens.

[0008] The present invention solves the above technical problems through the following technical solutions: According to one aspect of the present invention, a 2G2P wide-angle lens is provided, characterized in that it includes, in order from the object side to the image side of the optical axis: a fourth lens, a third lens, an aperture, a second lens and a first lens; the fourth lens has a negative optical focal length, and its object side surface is a curved plane, the image side surface is a concave surface with a curvature radius of 1.87 mm, and a refractive index of 1.59; the third lens has a positive optical focal length, and its object side surface is a plano-convex surface with a curvature radius of 11.92 mm, the image side surface is a convex surface with a curvature radius of 4.19 mm, and a refractive index of 1.697; the aperture is installed at 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 focal length, and its object side surface is a convex surface with a curvature radius of 5.15 mm, the image side surface is a concave surface with a curvature radius of 1.75 mm, and a refractive index of 1.65; The first lens has positive optical power, an object side surface is convex with a curvature radius of 1.75 mm, an image side surface is convex with a curvature radius of 8.03 mm, and a refractive index of 1.534.

[0009] Furthermore, the first lens and the second lens are made of plastic, the third lens and the fourth lens are made of glass, and the aperture is 6.0 mm. 3.92mm The high light-shielding material with an aperture of 0.03 mm is installed on the object side surface of the second lens at an oblique angle of 45°.

[0010] Furthermore, the 2G2P wide-angle lens further includes: The lens assembly comprises a lens housing, and surfaces at both ends thereof are respectively engaged with a locking assembly and a pressing assembly; The locking assembly is composed of an end cap, a black glue layer is filled between the end cap and the lens housing, an inner ring body is provided at the inner wall edge of the end cap located at the bottom of the black glue layer, and a tightening mechanism is threadedly sleeved on the surface of the lens housing; The pressing assembly comprises a pressing cover, which is threadedly sleeved on the surface of the lens housing, and the edge of the pressing cover is closely connected with the tensioning mechanism.

[0011] Furthermore, the lens housing is made of a metal material with an annular structure, and a first lens, a second lens and a third lens are respectively embedded in the lens housing. The first lens is close to one side of the clamping assembly and overlaps the inner wall of the lens housing. The first lens and the second lens are glued to each other, and a first limit ring is provided between the second lens and the third lens, and the first limit ring is embedded and sleeved in the interior of the lens housing.

[0012] Furthermore, one side of the third lens overlaps with the edge of the first limiting ring, the first limiting ring is fitly connected to the edge of the second lens, the other side of the third lens is fitly connected to the second limiting ring, the second limiting ring is fitly connected to the bottom surface of the third limiting ring, and the second limiting ring and the third limiting ring are both fitly connected to the inside of the lens housing, the top surface of the third limiting ring is fitly connected to the fourth lens, and the third limiting ring is arranged inside the top end of the wider diameter of the lens housing.

[0013] Furthermore, the bottom edge of the fourth lens is engaged with a sealing ring, the sealing ring is embedded inside the top end of the lens housing, the diameter of the fourth lens is greater than the diameter of the third lens, and the top edge of the fourth lens is sealed and fitted with the end cover.

[0014] According to another aspect of the present invention, a high sealing structure of a 2G2P wide-angle lens is provided, characterized in that: it comprises a locking assembly and the pressing assembly, The locking assembly is composed of an end cap, a black glue layer is filled between the end cap and the lens housing, an inner ring body is provided at the inner wall edge of the end cap located at the bottom of the black glue layer, and a tightening mechanism is threadedly sleeved on the surface of the lens housing; A pressure ring is fixedly connected to the edge of the inner wall of the end cover, and the pressure ring is fitly connected to the top edge of the lens housing. A black glue layer is filled between the pressure ring and the inner ring body, and the black glue layer is located between the lens housing and the end cover. The end cover is stamped and sleeved on the surface of the lens housing. The cross-section of the inner ring body is a U-shaped structure and contacts with the bottom surface of the glue layer. There are two inner ring bodies, and a bayonet located inside the end cover is formed between the two inner ring bodies.

[0015] Furthermore, the inner wall of the inner ring body is engaged with the block, the width of the block is the same as the width of the bayonet for movement of the block, the top of the block is an L-shaped structure and is located inside the inner ring body, and the bottom of the block is engaged and slidable inside the tensioning mechanism.

[0016] Furthermore, 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, the cross-section of one side of the movable ring is a U-shaped structure, and a card block is slidably connected to the inside of the movable ring, a card groove corresponding to the card block is opened inside the inner ring body, and after the card block moves, the card block is engaged with the inside of the card groove, and the outer wall of the bottom of the card block and the inner wall of the movable ring are fixedly connected with magnets corresponding to each other.

[0017] Furthermore, the clamping assembly includes a pressure cover, which is threadedly sleeved on the surface of the lens housing, and the edge of the pressure cover is fit-connected to the tensioning mechanism; a groove is provided on the top of the pressure cover, which is fit-connected to the lens housing, and the inside of the groove is fit-connected to the bottom of the push rod, and when the pressure cover is tightened, the pressure cover is fit-connected to the bottom of the movable ring, a gasket is fixedly connected to the inside of the bottom end of the pressure cover, and the gasket is fit-connected to the inside of the bottom end of the lens housing, a groove is provided at the bottom of the lens housing for filling the UV glue layer of the glass sheet, the UV glue layer of the glass sheet is bonded to the edge of the glass sheet, and the glass sheet is fit-connected to the bottom edge of the lens housing, and the inner edge of the pressure cover is fit-connected to the glass sheet for clamping and fixing the glass sheet.

[0018] Furthermore, a sealing mechanism is provided at the bottom of the end cover, and the sealing mechanism includes a blocking block, the width of the blocking block is the same as that of the card block, the blocking block is engaged with the inside of the card slot, and the top of the blocking block is provided with an arc surface that fits with the black glue layer, and the two sides of the bottom of the blocking block are respectively fixedly connected to the first baffle plate and the second baffle plate, the first baffle plate and the second baffle plate are both annular structures, and the first baffle plate and the second baffle plate are both fitted and connected with the end cover and the bottom surface of the inner ring body.

[0019] Furthermore, a notch and a socket are respectively provided at the top and bottom of the movable ring, a push rod is inserted into the socket, the push rod is embedded in the socket, and the push rod is fitly connected to the surface of the lens housing. The cross-section of the push rod is an L-shaped structure, the top of the push rod is fitly connected to the first baffle, and the outer wall of the movable ring is fixedly connected to the push rod by screws. There are several push rods, which are evenly distributed around the lens housing, and the push rods are staggered with the blocks.

[0020] According to the present invention, the 2G2P wide-angle lens provided adopts a glass-plastic combination and reasonably sets the optical focal length of each lens. Therefore, it is possible to meet the requirement that the focal length ratio of the wide-angle lens to the focal length of the first lens is within a wide range, while ensuring that the optical focal length deviation is extremely low within a wide temperature range, thereby ensuring higher imaging clarity.

[0021] According to the present invention, since the aperture in the present invention adopts the high light-shielding material developed by SOMA Corporation of Japan, the flatness of the light-shielding surface can be greatly guaranteed, and since it is installed at a 45-degree oblique angle, it can further ensure that the light passing through the aperture will not produce reflection, halo, etc. Since the feature of the present invention is the combination of lens surfaces with specific curvature radii ground and polished along the optical axis direction, the aperture is not described in detail in the present invention and is not shown in the drawings.

[0022] According to the present invention, since it adopts the assembly of lens housing, end cover and pressure cover to realize the assembly of wide-angle lens, the sealing performance of each structural position is realized during the assembly, and after the end cover is stamped and locked, the black glue layer is filled densely, and then the end cover and the lens housing are pressed together by the cooperation of the card block to ensure the stability after assembly, and the sealing mechanism is used to realize the pressing and limiting of the black glue layer after filling, to ensure the filling and sealing of each position, and the limiting of the sealing mechanism is realized while the pressing assembly is fixed, and the pressing assembly realizes the assembly and sealing of the glass sheet, realizes the assembly and sealing of the two ends of the lens assembly, and realizes the pressing and filling of the black glue through the cooperation of the two ends of the lens after assembly, improves the sealing performance, and can ensure the overall performance of the lens appearance, improve the assembly effect and high sealing performance of the wide-angle lens.

[0023] According to the present invention, since the surfaces at both ends of the lens assembly are respectively engaged with the locking assembly and the pressing assembly, the wide-angle lens and the sealing structure of the present invention can meet the IP6K9K protection level standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the overall three-dimensional structure of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0025] Figure 2It is a schematic diagram of a half-cut three-dimensional structure of a lens assembly of a 2G2P wide-angle lens involved in a specific embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of a half-section three-dimensional structure of a movable ring of a 2G2P wide-angle lens involved in a specific embodiment of the present invention.

[0027] Figure 4 The figure is a schematic diagram of the three-dimensional structure of a 2G2P wide-angle lens after the block is moved according to a specific embodiment of the present invention.

[0028] Figure 5 The figure is a schematic diagram of the three-dimensional structure of the inner ring of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0029] Figure 6 The figure is a front view of the internal structure of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0030] Figure 7 The figure is a side view of the internal structure of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0031] Figure 8 The figure is a schematic diagram of the appearance of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0032] Fig. 9 The figure is a schematic diagram of the three-dimensional structure of the rod stop of a 2G2P wide-angle lens according to a specific embodiment of the present invention.

[0033] Fig.10 The present invention is a schematic diagram of the external front view structure of the movable ring and the inner ring body of the 2G2P wide-angle lens involved in a specific embodiment of the present invention.

[0034] Description of Reference Numerals 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; 200, locking assembly; 201, end cover; 202, pressure ring; 203, black glue layer; 204, inner ring body; 205, bayonet; 206, clamping block; 207, movable ring; 208, clamping groove; 209, blocking block; 210, first baffle; 211, second baffle; 212, arc surface; 213, notch; 214, jack; 215, stopper; 216, screw; 217, magnet; 300, clamping assembly; 301, pressure cover; 302, gasket; 303, notch; 304, glass sheet; 305, glass sheet UV adhesive layer. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in combination with specific implementation modes with reference to the accompanying drawings. However, the description is exemplary and the present invention is not limited to the scope of the specific implementation modes described.

[0036] Figure 1 Schematic diagram of the overall three-dimensional structure of a 2G2P wide-angle lens according to a specific embodiment of the present invention. Figure 2 It is a half-section diagram.

[0037] like Figure 1 , 2 As shown, the 2G2P wide-angle lens includes a lens assembly 100, a locking assembly 200 and a pressing assembly 300, and includes in sequence from the object side to the image side along the optical axis: a fourth lens 108, a third lens 105, an aperture, a second lens 103 and a first lens 102; the fourth lens 108 has a negative optical power, and its object side surface is a curved plane, the image side surface is a concave surface with a curvature radius of 1.87 mm, and a refractive index of 1.59; the third lens 105 has a positive optical power, and its object side surface is a plano-convex surface with a curvature radius of 11.92 mm, the image side surface is a convex surface with a curvature radius of 4.19 mm, and a refractive index of 1.697; The aperture 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 together to form a combined lens. The second lens 103 has a negative optical focal length, and its object side surface is a convex surface with a curvature radius of 5.15 mm, the 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 focal length, and its object side surface is a convex surface with a curvature radius of 1.75 mm, the image side surface 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, and the third lens (105) and the fourth lens (108) are made of glass. The aperture is a 6.0 mm made by SOMA of Japan. 3.92mm The high light-shielding material with an aperture of 0.03 mm is installed on the object side surface of the second lens (103) at an oblique angle of 45°.

[0038] 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 diagram of each optical part and the mechanical structure is given. The applicant believes that the wide-angle lenses in this application and other applications of the applicant can solve the problem of high-definition resolution. The only difference is the refractive index, optical focal length and curvature radius of each 2G2P surface type. Due to these differences, each wide-angle lens is used in different scenes according to its own characteristics and advantages, such as automobiles, ships, mobile phone terminals, military products, etc. Therefore, the wide-angle lenses recorded in Chinese patents CN112558279A, CN115480380B, CN115629467A, and CN115657276A are introduced into this article by reference, and this article is also their series of applications, and even further solves the solution to the sealing problem of these wide-angle lenses.

[0039] like Figure 1-10 As shown, the lens assembly 100 is composed of a lens housing 101, in which a plurality of lens structures are embedded, and the surfaces at both ends of the lens assembly 100 are respectively engaged with a locking assembly 200 and a pressing assembly 300; the locking assembly 200 is composed of an end cover 201, a black glue layer 203 is filled between the end cover 201 and the lens housing 101, and an inner ring body 204 is provided on the inner wall edge of the end cover 201 located at the bottom of the black glue layer 203, and a tightening mechanism is threadedly sleeved on the surface of the lens housing 101; the pressing assembly 300 includes a pressure cover 301, which is threadedly sleeved on the surface of the lens housing 101, and the edge of the pressure cover 301 is fit-connected with the tightening mechanism.

[0040] The lens housing 101 is made of a metal material with an annular structure, and 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 one side of the pressing assembly 300 and overlaps the inner wall of the lens housing 101. The first lens 102 and the second lens 103 are fitted and connected to each other, and 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 with the inside of the lens housing 101; one side of the third lens 105 is overlapped with the edge of the first limiting ring 104, the first limiting ring 104 is fitted and connected to the edge of the second lens 103, and the third lens 105 The other side is fitly connected with the second limiting ring 106, the second limiting ring 106 is fitly connected with the bottom surface of the third limiting ring 107, and the second limiting ring 106 and the third limiting ring 107 are both fitted and sleeved with the inside of the lens housing 101, the top surface of the third limiting ring 107 is fitly connected with the fourth lens 108, and the third limiting ring 107 is arranged inside the top of the wider diameter of the lens housing 101; the bottom edge of the fourth lens 108 is fitly connected with the sealing ring 109, and the sealing ring 109 is embedded in the top of the lens housing 101, the diameter of the fourth lens 108 is larger than the diameter of the third lens 105, and the top edge of the fourth lens 108 is sealed and fit with the end cover 201.

[0041] In the present technical solution, the first lens 102 and the second lens 103 are placed in sequence inside the lens housing 101, and then the first limiting ring 104 is installed inside the lens housing 101. After the third lens 105 is placed in the same way, the second limiting ring 106 and the third limiting ring 107 are installed in sequence inside the lens housing 101. At this time, the fourth lens 108 is installed on the top of the lens housing 101 so that it presses the sealing ring 109 to achieve the sealing between the edge of the wide-angle lens and the lens housing 101. After assembly, the end cover 201 is stamped and locked.

[0042] like Figure 3-5As shown, the inner wall edge of the end cover 201 is fixedly connected to the pressure ring 202, and the pressure ring 202 is fitted and connected to 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 cover 201. The end cover 201 is stamped and sleeved with the surface of the lens housing 101. The cross-section of the inner ring body 204 is a U-shaped structure and contacts 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 cover 201 is formed between the two inner ring bodies 204; the inner wall of the inner ring body 204 is engaged with a card block 206, and the width of the card block 206 is the same as the width of the bayonet 205 for use The block 206 moves, the top of the block 206 is an L-shaped structure and is located inside the inner ring body 204, and the bottom of the block 206 is engaged and slidably engaged with the inside of 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, the cross-section of one side of the movable ring 207 is a U-shaped structure, and the movable ring 207 is slidably connected with the block 206, the inner ring body 204 is provided with a slot 208 corresponding to the block 206, and after the block 206 moves, the block 206 is engaged and engaged with the inside of the slot 208, and the outer wall of the bottom of the block 206 and the inner wall of the movable ring 207 are fixedly connected with magnets 217 corresponding to each other.

[0043] In the present 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 cover 201, the end cover 201 is locked by stamping equipment, which drives the pressure ring 202 to press on the edge of the lens housing 101 to achieve sealing at the connection, and at the same time, the black glue layer 203 is filled between the end cover 201 and the lens housing 101 below the pressure ring 202, and after assembly, the black glue continues to be filled from the gap between the inner ring body 204 and the lens housing 101, and before filling, the movable ring 207 is rotated, and the movable ring 207 moves upward to drive the block 206 from the bayonet 205 Insert and rotate the block 206 inside the movable ring 207, so that the magnet 217 matching the block 206 is separated, and the block 206 is rotated to the position of the slot 208. At this time, the block 206 falls into the slot 208 due to gravity. When the movable ring 207 continues to rotate in the opposite direction, the block 206 is limited by the slot 208. When the movable ring 207 rotates downward, it drives the block 206 to move downward, so that the block 206 pulls the inner ring body 204 and the end cover 201 downward, ensuring the tightening force between the end cover 201 and the top of the lens housing 101 to avoid the problem of loosening of its structure due to long-term use.

[0044] like Figure 5-10As shown, a blocking mechanism is provided at the bottom of the end cover 201, and the blocking mechanism includes a blocking block 209, the width of the blocking block 209 is the same as that of the clamping block 206, the blocking block 209 is inserted and engaged with the inside of the bayonet 205, and the top of the blocking block 209 is provided with an arc surface 212 that fits with the black glue layer 203, and the two sides of the bottom of the blocking block 209 are respectively fixedly connected with the first baffle plate 210 and the second baffle plate 211, the first baffle plate 210 and the second baffle plate 211 are both annular structures, and the first baffle plate 210 and the second baffle plate 211 are both fitted and connected with the end cover 201 and the bottom surface of the inner ring body 204; the movable ring 20 A notch 213 and a plug hole 214 are respectively provided at the top and the bottom, and a push rod 215 is inserted and inserted inside the plug hole 214. The push rod 215 is embedded inside the plug hole 214, and the push rod 215 is fitted and connected to the surface of the lens housing 101. The cross section of the push rod 215 is an L-shaped structure. The top of the push rod 215 is fitted and connected to the first baffle 210, and the outer wall of the movable ring 207 is fixedly connected to the push rod 215 by screws 216. There are several push rods 215, and the several push rods 215 are evenly distributed around the lens housing 101, and the push rods 215 and the blocks 206 are staggered.

[0045] In the present technical solution, after the end cover 201 is tightened and limited by the locking assembly 200, black glue is continued to be filled to fill it to form a structure of a black glue layer 203, and then the blocking block 209 is embedded in the bayonet 205. At this time, the blocking block 209 drives the first baffle plate 210 and the second baffle plate 211 to fit the bottom edge of the end cover 201 and the inner ring body 204, thereby achieving sealing after the black glue filling, and then the pressure cover 301 is assembled.

[0046] The top of the pressure cover 301 is provided with a slot 303 which fits with the lens housing 101, the inside of the slot 303 is engaged with the bottom of the push rod 215, and when the pressure cover 301 is tightened, the pressure cover 301 is engaged with the bottom of the movable ring 207, and the bottom of the pressure cover 301 is fixedly connected with a gasket 302, and the gasket 302 is engaged with the bottom of the lens housing 101. The bottom of the lens housing 101 is provided with a groove for filling the glass sheet 304 UV glue layer 305, the glass sheet 304 UV glue layer 305 is bonded to the edge of the glass sheet 304, and the glass sheet 304 is engaged with the bottom edge of the lens housing 101, and the inner edge of the pressure cover 301 is engaged with the glass sheet 304 for pressing and fixing the glass sheet 304.

[0047] In the present technical solution, when the movable ring 207 is rotated, because the pressure cover 301 has not been assembled yet, the push rod 215 falls due to gravity and overlaps the top edge of the movable ring 207, and does not affect the rotation of the movable ring 207. After the movable ring 207 is screwed down and the end cover 201 is tightened, the block 209 is engaged in the bayonet 205. At this time, the pressure cover 301 is installed again, and the pressure cover 301 rotates and pushes the push rod 215 to move upward, so that the push rod 215 moves upward inside the notch 213 and the insertion hole 214, so that the top of the push rod 215 pushes the first baffle plate 210 to move upward, so that the first baffle plate 210 and the second baffle plate 211 are pressed tightly against the end cover 201 and the bottom surface of the inner ring body 204, and drives the block 209 to be engaged in the bayonet 205, so that the arc surface 212 at the top of the block 209 It fits with the black glue layer 203 to achieve compression and sealing of the black glue layer 203. When the pressure cover 301 is installed in place, it fits with the bottom surface of the movable ring 207 to improve the integrity of the lens after assembly. At the same time, the pressure cover 301 drives the gasket 302 to be embedded in the bottom edge of the lens housing 101, and before the pressure cover 301 is installed, the glass piece 304 UV glue layer 305 is filled in the groove at the bottom. After the glass piece 304 is assembled, the pressure cover 301 is installed. At the same time, the pressure cover 301 presses the glass piece 304 to form the glass piece 304 UV glue layer 305, and at the same time ensures the compression of the glass piece 304 and the sealing performance of the connection position. At this time, the pressure cover 301 and the movable ring 207 are simultaneously limited and fixed, which improves the stability of the wide-angle lens after assembly while also ensuring the sealing performance of the assembly position.

[0048] According to the present invention, since a glass-plastic combination is adopted and the optical focal length of each lens is reasonably set, it is possible to meet the requirement that the focal length ratio of the wide-angle lens to the focal length of the first lens is within a wide range while ensuring that the optical focal length deviation is extremely low within a wide temperature range, thereby ensuring higher imaging clarity.

[0049] According to the present invention, since the assembly of the wide-angle lens is achieved by assembling the lens housing, the end cover and the pressure cover, the sealing performance of each structural position is achieved during the assembly, the assembly and sealing of the two ends of the lens assembly are achieved, and the compaction and filling of the black glue is achieved through the cooperation of the two ends of the lens after assembly, thereby 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 are improved.

[0050] According to the present invention, since the surfaces at both ends of the lens assembly are respectively engaged with the locking assembly and the pressing assembly, the IP6K9K protection level standard can be achieved.

[0051] The present invention has been described in detail above with reference to specific implementation modes. However, the present invention is not limited to the above implementation modes. Those skilled in the art may make various changes or modifications to these implementation modes without departing from the principle and essence of the present invention. However, these changes and modifications shall 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: The optical lens comprises, in order from the object side to the image side of the optical axis: a fourth lens (108), a third lens (105), an aperture, a second lens (103) and a first lens (102); the fourth lens (108) has a negative optical focal length, and its object side surface is a curved 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 (105) has a positive optical focal length, 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 aperture is mounted 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 together to form a combined lens, the second lens (103) has a negative optical focal length, 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 (102) has positive optical power, an object side surface is a convex surface with a radius of curvature of 1.75 mm, an image side surface is a convex surface with a radius of curvature of 8.03 mm, and a refractive index of 1.

534.

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

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

4. The 2G2P wide-angle lens as claimed in claim 3, characterized in that: 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 one side of the pressing assembly (300) and overlaps the inner wall of the lens housing (101). The first lens (102) and the second lens (103) are glued to each other, and a first limiting ring (104) is provided between the second lens (103) and the third lens (105). The first limiting ring (104) is embedded and sleeved in the lens housing (101).

5. The 2G2P wide-angle lens as claimed in claim 4, characterized in that: One side of the third lens (105) is overlapped with the edge of the first limiting ring (104), the first limiting ring (104) is fitted and connected to the edge of the second lens (103), the other side of the third lens (105) is fitted and connected to the second limiting ring (106), the second limiting ring (106) is fitted and connected to the bottom surface of the third limiting ring (107), and the second limiting ring (106) and the third limiting ring (107) are both fitted and sleeved with the inside of the lens housing (101), the top surface of the third limiting ring (107) is fitted and connected to 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 as claimed in claim 5, characterized in that: The bottom edge of the fourth lens (108) is engaged with a sealing ring (109), the sealing ring (109) is embedded inside the top end of the lens housing (101), the diameter of the fourth lens (108) is greater than the diameter of the third lens (105), and the top edge of the fourth lens (108) is sealed and fitted with the end cover (201).

7. The high sealing structure of the 2G2P wide-angle lens according to any one of claims 1 to 6, characterized in that: comprising the locking assembly (200) and the pressing assembly (300), The locking assembly (200) is composed of an end cover (201), a black glue layer (203) is filled between the end cover (201) and the lens housing (101), an inner ring body (204) is provided on the inner wall edge of the end cover (201) at the bottom of the black glue layer (203), and a tightening mechanism is threadedly sleeved on the surface of the lens housing (101); A pressure ring (202) is fixedly connected to the edge of the inner wall of the end cover (201), and the pressure ring (202) is fitted and connected to 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 cover (201). The end cover (201) is stamped and sleeved with the surface of the lens housing (101). 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. There are two inner ring bodies (204), and a bayonet (205) located inside the end cover (201) is formed between the two inner ring bodies (204).

8. The high sealing structure according to claim 7, characterized in that: The inner wall of the inner ring body (204) is engaged with the clamping block (206); the width of the clamping block (206) is the same as the width of the clamping opening (205) for 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); and the bottom end of the clamping block (206) is engaged and slidable inside the tensioning mechanism.

9. The high sealing structure according to claim 8, characterized in that: The tensioning mechanism comprises a movable ring (207), the inner wall of the bottom end of the movable ring (207) being threadedly connected to the lens housing (101), the cross-section of one side of the movable ring (207) being a U-shaped structure, and a clamping block (206) being slidably connected inside the movable ring (207), a clamping groove (208) corresponding to the clamping block (206) being provided inside the inner ring body (204), and after the clamping block (206) moves, the clamping block (206) is engaged and clamped inside the clamping groove (208), and magnets (217) corresponding to each other are fixedly connected to the outer wall of the bottom end of the clamping block (206) and the inner wall of the movable ring (207).

10. The high sealing structure according to claim 7, characterized in that: The pressing assembly (300) comprises a pressing cover (301), the pressing cover (301) is threadedly sleeved on the surface of the lens housing (101), and the edge of the pressing cover (301) is fitted and connected to the tensioning mechanism; The top of the pressure cover (301) is provided with a notch (303) that fits with the lens housing (101), the inside of the notch (303) is engaged with the bottom of the push rod (215), and when the pressure cover (301) is tightened, the pressure cover (301) is engaged with the bottom of the movable ring (207), and a gasket (302) is fixedly connected to the bottom of the pressure cover (301), and the gasket (302) is engaged with the bottom of the lens housing (101). The lens housing (101) is internally chiseled and connected, the bottom of the lens housing (101) is provided with a groove for filling the glass sheet (304) UV adhesive layer (305), the glass sheet (304) UV adhesive layer (305) is bonded to the edge of the glass sheet (304), and the glass sheet (304) is fitted and connected to the bottom edge of the lens housing (101), and the inner edge of the pressure cover (301) is fitted and connected to the glass sheet (304) for pressing and fixing the glass sheet (304).

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