Lens for eight-megapixel automatic driving visual system camera

Abstract

The invention relates to the technical field of optical design equipment, in particular to a lens for an eight-mega-pixel automatic driving vision system camera, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a lens cone and a lens cap, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from an object space to an image plane of the lens; the outer side of the image surface of the seventh lens is protective glass, and the outer side of the image surface of the protective glass is a lens imaging surface; bBAR films are plated on the image surfaces and the object surfaces of all the lenses, a red film layer is plated on the third lens, a clamping ring is arranged between part of the lenses, in the optical design process, adjustment of the number of the lenses, adjustment of arrangement, shape and optimization of materials are comprehensively considered, the full-glass lens is used, and the stability of the lens structure and the reliability of the performance are guaranteed. The lens for the eight-mega-pixel automatic driving vision system camera has the effect of improving the shooting efficiency of the lens for the eight-mega-pixel automatic driving vision system camera in the using process.

Description

Technical Field

[0001] The present application relates to the technical field of optical design equipment, and in particular to a lens for an 8-megapixel autonomous driving vision system camera. Background Art

[0002] With the continuous advancement of automotive technology, the importance of vehicle-mounted lenses as one of the key sensors for vehicles to perceive the environment is becoming increasingly prominent.

[0003] As a key component of vehicle perception of the environment, the performance of automotive lenses directly affects the safety and reliability of the system. Although traditional automotive lenses can meet basic image acquisition requirements to a certain extent, their performance in high dynamic range, high resolution and complex lighting conditions is often unsatisfactory. Therefore, the market urgently needs a new type of automotive lens that can not only provide high-definition images, but also maintain stable performance under various environmental conditions.

[0004] The 8-megapixel front-facing camera offers higher resolution with a 120° field of view, which is wider than the 50-80° field of view of mainstream products on the market, allowing them to cover a wider area while maintaining high clarity.

[0005] At present, the front-view cameras installed in vehicles are mainly installed on the front windshield. According to different visual perception tasks, they can be divided into three types: main camera, narrow-angle camera and wide-angle camera. Traditional front-view wide-angle cameras are mainly used in urban roads and low-speed driving scenes, with a field of view of 120°-150° and a detection distance of about 50 meters. The front-view narrow-angle camera is used to identify targets such as traffic lights and pedestrians. The field of view is about 30-40° and the detection distance can reach 250 meters. Due to its high resolution and wide field of view, the 8-megapixel front-view camera can cover the functions of wide-angle and narrow-angle cameras without reducing image quality, thereby enhancing the performance of use. Summary of the invention

[0006] In order to improve the shooting efficiency of the lens for an 8-megapixel autonomous driving vision system camera during use, the present application provides a lens for an 8-megapixel autonomous driving vision system camera.

[0007] The present application provides a lens for an 8-megapixel autonomous driving vision system camera, which adopts the following technical solution: a lens for an 8-megapixel autonomous driving vision system camera, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a lens barrel and a lens cap, wherein from the object space to the image plane of the lens are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens in sequence; the outer side of the image plane of the seventh lens is a protective glass and a lens imaging surface; The image surfaces and object surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all coated with BBAR films, and the third lens is coated with a red film layer; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all fixedly installed in the lens barrel, the first lens is clamped in the lens cap, and a lens cap barb is provided at the clamping position of the first lens and the lens cap; the upper and lower parts of the first lens and the second lens are tightly attached, and a first clamping ring is provided between the second lens and the third lens; The third lens and the fourth lens are fixed by a limiting step of the lens barrel; a second clamping ring is arranged between the fourth lens and the fifth lens; a third clamping ring is arranged between the sixth lens and the seventh lens, and the seventh lens is clamped in the lens barrel by the fourth clamping ring.

[0008] In a specific possible implementation manner, the object surface of the first lens is an even-order aspheric surface with a radius of curvature of 5.715 mm, and the center thickness of the first lens is 2.376 mm; the image surface of the first lens is an even-order aspheric surface with a radius of curvature of 2.443 mm, and the distance between the image surface of the first lens and the center vertex of the object surface of the second lens is 3.051 mm.

[0009] In a specific implementation scheme, the object surface of the second lens is a spherical surface with a curvature radius of -11.406 mm, and the center thickness of the second lens is 4.759 mm; the image surface of the second lens is a spherical surface with a curvature radius of -12.058 mm, and the distance between the image surface of the second lens and the central vertex of the object surface of the third lens is 0.262 mm.

[0010] In a specific implementation scheme, the object surface of the third lens is a spherical surface with a radius of curvature of 9.608 mm, and the center thickness of the third lens is 1.667 mm; the image surface of the third lens is a plane, and the distance between the image surface of the third lens and the center vertex of the object surface of the fourth lens is 2.263 mm.

[0011] In a specific possible implementation manner, the object plane of the fourth lens is a plane, and the center thickness of the fourth lens is 1.324 mm; the image plane of the fourth lens is a spherical surface, and the radius of curvature is 9.623 mm, and the distance between the image plane of the fourth lens and the center vertex of the object plane of the fifth lens is 0.1 m.

[0012] In a specific possible implementation scheme, the object surface of the fifth lens is a spherical surface with a curvature radius of 15.845 mm, and the center thickness of the fifth lens is 2.05 mm; the image surface of the fifth lens is a spherical surface with a curvature radius of 4.4016 mm, and the distance between the image surface of the fifth lens and the central vertex of the object surface of the sixth lens is 0.

[0013] In a specific possible implementation scheme, the object surface of the sixth lens is a spherical surface with a curvature radius of 4.4016 mm, and the center thickness of the sixth lens is 0.44 mm; the image surface of the sixth lens is a spherical surface with a curvature radius of 59.85 mm, and the distance between the image surface of the sixth lens and the central vertex of the object surface of the seventh lens is 1.58 mm.

[0014] In a specific implementation manner, the object surface of the seventh lens is a spherical surface with a radius of curvature of 14.072 mm, and the center thickness of the seventh lens is 1.493 mm; the image surface of the seventh lens is a plane, and the distance between the image surface of the seventh lens and the central vertex of the protective glass is 4.1 mm.

[0015] By adopting the above technical solution, the present invention adopts a large aperture, more light flux, enhances the image brightness, and improves the detail resolution, making the imaging clearer; it has high environmental adaptability and can pass the high-specification vehicle-mounted reliability test. The surface coating of the lens can improve the transmittance, reduce the loss, reduce the light reflection, and suppress the interference of stray light to improve the clarity; the optimization of adjusting the number of lenses, adjusting the arrangement, shape and materials is comprehensively considered, and the full glass lens is used to ensure the stability of the lens structure and the reliability of the performance.

[0016] In a specific feasible implementation scheme, a limiting mechanism for limiting the first clamping ring, the second clamping ring and the third clamping ring is installed on the lens barrel, and a mounting groove is opened on the lens barrel. The limiting mechanism includes a loading block, and the loading block is installed on the lens barrel. The loading block is arranged in the mounting groove. A rotating rod is rotatably installed on the loading block, and a lifting frame is connected to the rotating rod, and the lifting frame is mounted on the loading block. The lifting frame is connected to a first spring, and the end of the first spring away from the lifting frame is connected to the loading block. The first clamping ring, the second clamping ring and the third clamping ring are all installed with a push plate for pushing the rotating rod to rotate, and a driving component for pushing the rotating rod to rotate is installed on the lens barrel.

[0017] By adopting the above technical solution, when the first clamping ring, the second clamping ring and the third clamping ring are installed in the lens barrel, the push plates on the first clamping ring, the second clamping ring and the third clamping ring will resist the rotating rod and push the rotating rod to rotate on the loading block. When the rotating rod rotates, it drives the lifting frame to lift off the loading block. When the lifting frame lifts off the loading block, it pulls the first spring to deform. When the push plate slides off the rotating rod, the rotating rod loses the supporting force of the push plate, and the first spring pulls the lifting frame to contact the loading block again. At this time, the rotating rod and the lifting frame resist the push plate, so that the push plate will not separate from the lens barrel, so that the operator can quickly and safely adjust and replace the lens.

[0018] In a specific feasible implementation scheme, a slide groove is provided on the lens barrel, and the driving assembly includes a push rod, which is slidably installed on the lens barrel, one end of the push rod extends into the installation groove, and the end of the push rod extending into the installation groove abuts against the rotating rod, and one end of the push rod extends into the slide groove, and the end of the push rod extending into the slide groove is connected to a pressing plate, and the pressing plate is arranged in the slide groove, and the pressing plate is slidably connected to the lens barrel through the slide groove, and a second spring is sleeved on the push rod, and one end of the second spring is connected to the pressing plate, and the other end is connected to the lens barrel.

[0019] By adopting the above technical solution, the pressing plate is pushed, and the pressing plate drives the push rod to move and drives the rotating rod to rotate, and the rotating rod drives the lifting frame to leave the transfer fast lifting frame and rise to release the push plate, so as to facilitate the quick removal of the lens.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention adopts a large aperture, more light flux, enhances the image brightness, improves the detail resolution, and makes the image clearer; it has high environmental adaptability and can pass the high-standard vehicle-mounted reliability test. The surface coating of the lens can improve the transmittance, reduce the loss, reduce the light reflection, and suppress the interference of stray light to improve the clarity; the optimization of adjusting the number of lenses, adjusting the arrangement, shape and materials is comprehensively considered, and the full glass lens is used to ensure the stability of the lens structure and the reliability of the performance.

[0021] 2. Through the setting of the limiting mechanism, when the first clamping ring, the second clamping ring and the third clamping ring are installed in the lens barrel, the push plates on the first clamping ring, the second clamping ring and the third clamping ring will resist the rotating rod and push the rotating rod to rotate on the loading block. When the rotating rod rotates, it drives the lifting frame to lift off the loading block. When the lifting frame lifts off the loading block, it pulls the first spring to deform. When the push plate slides off the rotating rod, the rotating rod loses the supporting force of the push plate, and the first spring pulls the lifting frame to contact the loading block again. At this time, the rotating rod and the lifting frame resist the push plate, so that the push plate will not separate from the lens barrel, so that the operator can quickly and safely adjust and replace the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the optical system structure of the vehicle-mounted lens of an embodiment of the present application.

[0023] Figure 2 is an axial chromatic aberration curve diagram of an embodiment of the present application.

[0024] Figure 3 It is a vertical axis chromatic aberration curve diagram of an embodiment of the present application.

[0025] Figure 4 4 is a field curvature distortion curve diagram of an embodiment of the present application.

[0026] Figure 5 It is a relative brightness diagram of an embodiment of the present application.

[0027] Figure 6 It is a diagram of the chief ray angle (Chief Ray Angle) of an embodiment of the present application.

[0028] Figure 7 It is an MTF curve diagram of an embodiment of the present application.

[0029] Figure 8 It is a schematic diagram of the limiting mechanism of an embodiment of the present application.

[0030] Fig. 9 yes Figure 8 Enlarged view of point A in the middle.

[0031] Figure numerals: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, lens cap; 9, lens barrel; 91, mounting groove; 92, limiting mechanism; 921, loading block; 9211, storage groove; 922, rotating rod; 923, lifting frame; 924, first spring; 925, push plate; 93, slide groove; 94, driving assembly; 941, push rod; 942, pressing plate; 943, second spring; 10, first clamping ring; 11, second clamping ring; 12, third clamping ring; 13, fourth clamping ring; 14, lens cap hook. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-9 This application is described in further detail.

[0033] The present application embodiment discloses a lens for an 8-megapixel autonomous driving vision system camera, referring to Figure 1, including a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a lens barrel 9 and a lens cap 8. From the object space of the lens to the image plane, they are: the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7; the outer side of the image plane of the seventh lens 7 is the protective glass and the lens imaging surface.

[0034] The image plane and object plane of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all coated with BBAR film, and the third lens 3 has a red film layer that filters harmful ultraviolet rays and blue light. The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all fixedly installed in the lens barrel 9, the first lens 1 is clamped in the lens cap 8, and the lens cap barb 14 is provided at the junction of the first lens 1 and the lens cap 8; the upper and lower parts of the first lens 1 and the second lens 2 are tightly attached, and a first clamping ring 10 is provided between the second lens 2 and the third lens 3. The third lens 3 and the fourth lens 4 are fixed by the limiting step of the lens barrel 9; the second clamping ring 11 is provided between the fourth lens 4 and the fifth lens 5; the third clamping ring 12 is provided between the sixth lens 6 and the seventh lens 7, and the seventh lens 7 is clamped in the lens barrel 9 by the fourth clamping ring 13.

[0035] In the following text description and table, lens 1 is the first lens 1, lens 2 is the second lens 2, lens 3 is the third lens 3, lens 4 is the fourth lens 4, lens 5 is the fifth lens 5, lens 6 is the sixth lens 6, and lens 7 is the seventh lens 7.

[0036] Table 1 lists the detailed parameters of the design. The first row lists the main parameters of the lens: Focal length f=5.09 mm, aperture F / #: 1.6, total optical track length: TTL=27.00 mm.

[0037] The headings of Table 1 list: "Surface", "Type", "Radius of Curvature", "Thickness", "Refractive Index", and "Abbe Number". Lens element materials are defined by their refractive index and Abbe number. In Table 1, a blank cell in the "Refractive Index" column indicates that the value in the "Thickness" cell to its left is the distance to the next lens surface vertex.

[0038] In Table 1, the radius of curvature of the object surface is infinite, that is, a plane, and is infinitely far from the center vertex of the next surface (object surface of lens 1).

[0039] Surface 1 is the object surface of lens 1, which is an even aspheric surface with a radius of curvature of 5.715 mm. It is 2.376 mm away from the center vertex of the next surface (image surface of lens 1), that is, the center thickness of lens 1 is 2.376 mm, the refractive index is 1.809995, and the Abbe coefficient is 41.000073.

[0040] Surface 2 is the image surface of lens 1, which is an even-order aspheric surface with a radius of curvature of 2.443 mm and a distance of 3.051 mm from the next surface (object surface of lens 2).

[0041] Surface 3 is the object surface of lens 2, which is a spherical surface with a radius of curvature of -11.406 mm. It is 4.759 mm away from the center vertex of the next surface (image surface of lens 2), that is, the center thickness of lens 2 is 4.759 mm, the refractive index is 2.000689, and the Abbe coefficient is 25.435062.

[0042] Surface 4 is the image surface of lens 2, which is a spherical surface with a radius of curvature of -12.058 mm and a distance from the next surface (object surface of lens 3) of 0.262 mm.

[0043] Surface 5 is the object plane of lens 3, which is a spherical surface with a radius of curvature of 9.608 mm. The center vertex of this surface is 1.667 mm away from the center vertex of the next surface (image plane of lens 3), that is, the center thickness of lens 3 is 1.667 mm, the refractive index is 1.804009, and the Abbe coefficient is 46.567682.

[0044] Surface 6 is the image plane of lens 3, which is a plane and is 2.263 mm away from the next surface (object plane of lens 4).

[0045] Surface 7 is the object plane of lens 4, which is a plane. The center vertex of this surface is 1.324 mm away from the center vertex of the next surface (image plane of lens 4), that is, the center thickness of lens 4 is 1.324 mm, the refractive index is 1.592824, and the Abbe coefficient is 68.624378.

[0046] Surface 8 is the image surface of lens 4, which is a spherical surface with a radius of curvature of -9.623 mm and a distance of 0.1 mm from the next surface (object surface of lens 5).

[0047] Surface 9 is the object surface of lens 5, which is a spherical surface with a radius of curvature of 15.8454 mm. The center vertex of this surface is 2.05 mm away from the center vertex of the next surface (the image surface of lens 5 or the object surface of lens 6), that is, the center thickness of lens 5 is 2.05 mm, the refractive index is 1.592824, and the Abbe coefficient is 68.624378.

[0048] Surface 10 is the image plane of lens 5. Since the distance between this surface and the object plane of lens 6 is 0 and the surface curvature radius is the same, surface 11 is both the image plane of lens 5 and the object plane of lens 6. This surface is a spherical surface with a curvature radius of -4.4016 mm, 0.443 mm away from the next surface (image plane of lens 6), and the center thickness of lens 6 is 0.443 mm.

[0049] Surface 11 is the image surface of lens 6, which is a spherical surface with a curvature radius of -59.851 mm and a distance of 1.58 mm from the central vertex of the next surface (object surface of lens 7).

[0050] Surface 12 is the object surface of lens 7; this surface is a spherical surface with a radius of curvature of 14.072 mm and a distance of 1.493 mm from the center vertex of the next surface (image surface of lens 7); that is, the center thickness of lens 7 is 1.49 mm, the refractive index is 2.000689, and the Abbe coefficient is 25.435062.

[0051] Surface 13 is the image surface of lens 7; this surface is a plane and is 4.1 mm away from the central vertex of the next surface (protective glass).

[0052] Surface 14 is the object surface of the protective glass, which is a plane with an infinite radius of curvature and is 0.5 mm away from the next surface (image surface of the protective glass), that is, the protective glass is 1.0 mm thick, has a refractive index of 1.516797, and an Abbe coefficient of 64.212351.

[0053] Surface 15 is the protective glass image plane, which is a plane with an infinite radius of curvature and is 0.003 mm away from the next surface (image plane).

[0054] Surface 16 is the lens imaging surface.

[0055] The aspheric surface formula used in the embodiment of the present invention is as follows: In the present invention, the lens barrel 9 is made of lightweight and strong AL6061 aluminum alloy, which not only reduces the weight of the lens but also enhances durability.

[0056] The present invention adopts a large aperture and more light flux, which enhances the image brightness and improves the detail resolution, making the imaging clearer.

[0057] The present invention has high environmental adaptability: it can pass high-specification vehicle-mounted reliability tests.

[0058] The surface coating of the lens of the present invention can improve transmittance, reduce loss, reduce light reflection, and suppress the interference of stray light, thereby improving clarity.

[0059] The invention has temperature resistance: it has a wide working temperature range of -40 to +125°C.

[0060] During the optical design process, the present invention comprehensively considers adjusting the number of lenses, adjusting the arrangement, optimizing the shape and materials, and uses an all-glass lens to ensure the stability of the lens structure and the reliability of the performance.

[0061] In this example, the axial chromatic aberration curve, vertical chromatic aberration curve, field curvature distortion curve, relative brightness diagram, chief ray angle diagram and MTF curve diagram of the optical lens are shown as follows: Figures 2 to 7 shown.

[0062] Reference Figure 2 The offset of the axial aberration of the optical lens provided in this example is controlled within a range of -0.005 mm to 0.045 mm, and the optical lens can correct the axial aberration well. Figure 3 The vertical axis chromatic aberration of the longest wavelength and the shortest wavelength of the optical lens provided in this example is controlled within -0.5um to 5um. The optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane. Figure 4 The field curvature of the optical lens at different wavelengths provided in this example is within ±0.04 mm, the field curvature of the optical lens is effectively controlled, the FTan (Theta) distortion of the optical lens is controlled within 55%, the distortion of the optical lens at each wavelength is well controlled, the image height and the field angle have a good linear relationship, the image compression in the edge angle area is relatively smooth, and the clarity of the expanded image is effectively improved. Figure 5 and Figure 6 The optical lens provided in this example has a full field relative brightness greater than 63% and a chief ray angle less than 20 degrees. The architecture of this optical lens is conducive to achieving high relative brightness and low chief ray angle, and can be well matched with the chip sensor, which is conducive to improving the imaging quality. Figure 7 The MTF value of the optical lens provided in this example is above 0.35 in the entire field of view. In the range of 0 to 240 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0063] Reference Figure 8 and Fig. 9The lens barrel 9 is provided with a mounting groove 91, and a limiting mechanism 92 for limiting the first clamping ring 10, the second clamping ring 11 and the third clamping ring 12 is installed on the lens barrel 9. The limiting mechanism 92 includes a loading block 921, and two rotating rods 922 are rotatably installed on the loading block 921. The two rotating rods 922 are respectively arranged on both sides of the loading block 921. A lifting frame 923 is fixedly connected to the two rotating rods 922. The lifting frame 923 is mounted on the loading block 921. A receiving groove 9211 is provided on the loading block 921. A first spring 924 is fixedly installed on the loading block 921. The first spring 924 is arranged in the receiving groove 9211, and one end of the first spring 924 away from the loading block 921 is fixedly connected to the lifting frame 923. The first clamping ring 10, the second clamping ring 11 and the third clamping ring 12 are all provided with a push plate 925 for pushing the rotating rod 922 to rotate on the loading block 921.

[0064] The lens barrel 9 is provided with a slide groove 93, and a driving assembly 94 for driving the rotating rod 922 to rotate is installed on the lens barrel 9. The driving assembly 94 includes a push rod 941, which is slidably installed on the lens barrel 9. One end of the push rod 941 extends into the slide groove 93 and the other end extends into the installation groove 91. The end of the push rod 941 extending into the installation groove 91 abuts against the rotating rod 922. A pressing plate 942 is fixedly installed on the end of the push rod 941 extending into the slide groove 93. The pressing plate 942 is arranged in the slide groove 93 and slidably installed on the lens barrel 9 through the slide groove 93. A second spring 943 is sleeved on the push rod 941, and one end of the second spring 943 is fixedly connected to the pressing plate 942, and the other end is fixedly connected to the lens barrel 9.

[0065] Before the first clamp ring 10, the second clamp ring 11 and the third clamp ring 12 are installed into the lens barrel 9, the first spring 924 pulls the lifting frame 923 to make the lifting frame 923 fall on the loading block 921. When the first clamp ring 10, the second clamp ring 11 and the third clamp ring 12 are installed into the lens barrel 9, the push plates 925 on the first clamp ring 10, the second clamp ring 11 and the third clamp ring 12 will abut against the rotating rod 922 to push the rotating rod 922 to rotate on the loading block 921. When rotating, the lifting frame 923 is driven to lift off the loading block 921. When the lifting frame 923 is lifted off the loading block 921, it will pull the first spring 924 to deform. When the push plate 925 slides off the rotating rod 922, the rotating rod 922 loses the supporting force of the push plate 925, and the first spring 924 will pull the lifting frame 923 to contact with the loading block 921 again. At this time, the rotating rod 922 and the lifting frame resist the push plate 925, so that the push plate 925 will not fall off the lens barrel 9.

[0066] When the lenses in the lens barrel 9 need to be adjusted or replaced, because each lens is directly or indirectly clamped on the lens barrel 9, when the lenses near the two sides of the lens barrel 9 are removed, the internal lenses will be lost. When the first lens 1 and the second lens 2 are removed, they become loose due to the thrust and are easy to fall out of the lens barrel, thereby causing damage to the lenses. For example, the first clamping ring 10 is limited by the limiting mechanism 92. When the first lens 1 and the second lens 2 are removed, the lifting frame 823 will resist the pushing plate 925 to prevent the first clamping ring 10 from falling out of the lens barrel 9, so that when the second lens 2 is taken and placed, the third lens 3 will not fall out of the lens barrel 9. After the second lens 2 is removed and placed, the pressing plate 942 is pushed, and the pressing plate 942 drives the push rod 925 to move and drives the rotating rod 922 to rotate, so that the rotating rod 922 drives the lifting frame 923 to leave the loading block 921 again. The lifting frame 923 rises and releases the pushing plate 925, so as to facilitate the quick removal of the first retaining ring 10 and the third lens 3, which is beneficial to improving the performance of the lens during use.

[0067] The implementation principle of the embodiment of the present application is as follows: the present invention adopts a large aperture and more light flux, which enhances the image brightness and improves the detail resolution, making the imaging clearer; the surface coating of the lens improves the transmittance, reduces the loss, reduces the light reflection, and suppresses the interference of stray light to improve the clarity; the adjustment of the number of lenses, the adjustment of the arrangement, the shape and the optimization of the material are comprehensively considered, and the full glass lens is used to ensure the stability of the lens structure and the reliability of the performance, and the first clamping ring 10, the second clamping ring 11 and the third clamping ring 12 are limited by the limiting mechanism 9, so that the operator can quickly and safely adjust and replace the lens.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lens for an 8-megapixel autonomous driving vision system camera, characterized in that: The lens comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), a lens barrel (9) and a lens cap (8), wherein from the object space of the lens to the image plane, the lens comprises the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7); the outer side of the image plane of the seventh lens (7) is a protective glass and a lens imaging surface; The image surfaces and object surfaces of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all coated with BBAR films, and the third lens (3) is coated with a red film layer; The first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all fixedly mounted in the lens barrel; the first lens (1) is clamped in the lens cap (8); a lens cap barb (14) is provided at the clamping point between the first lens (1) and the lens cap (8); the upper and lower parts of the first lens (1) and the second lens (2) are tightly attached; a first clamping ring (10) is provided between the second lens (2) and the third lens (3); The third lens (3) and the fourth lens (4) are fixed by a limiting step of the lens barrel (9); a second clamping ring (11) is provided between the fourth lens (4) and the fifth lens (5); a third clamping ring (12) is provided between the sixth lens (6) and the seventh lens (7), and the seventh lens (7) is clamped in the lens barrel (9) by a fourth clamping ring (13).

2. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the first lens (1) is an even-order aspheric surface with a radius of curvature of 5.715 mm, and the center thickness of the first lens (1) is 2.376 mm; the image surface of the first lens (1) is an even-order aspheric surface with a radius of curvature of 2.443 mm, and the distance between the image surface of the first lens (1) and the center vertex of the object surface of the second lens (2) is 3.051 mm.

3. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the second lens (2) is a spherical surface with a radius of curvature of -11.406 mm, and the central thickness of the second lens (2) is 4.759 mm; the image surface of the second lens (2) is a spherical surface with a radius of curvature of -12.058 mm, and the distance between the image surface of the second lens (2) and the central vertex of the object surface of the third lens is 0.262 mm.

4. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the third lens (3) is a spherical surface with a radius of curvature of 9.608 millimeters, and the center thickness of the third lens (3) is 1.667 millimeters; the image surface of the third lens (3) is a plane, and the distance between the image surface of the third lens (3) and the center vertex of the object surface of the fourth lens (4) is 2.263 millimeters.

5. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the fourth lens (4) is a plane, and the central thickness of the fourth lens (4) is 1.324 mm; the image surface of the fourth lens (4) is a spherical surface, and the radius of curvature is 9.623 mm, and the distance between the image surface of the fourth lens (4) and the central vertex of the object surface of the fifth lens (5) is 0.1 m.

6. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the fifth lens (5) is a spherical surface with a radius of curvature of 15.845 mm, and the central thickness of the fifth lens (5) is 2.05 mm; the image surface of the fifth lens (5) is a spherical surface with a radius of curvature of 4.4016 mm, and the distance between the image surface of the fifth lens (5) and the central vertex of the object surface of the sixth lens (6) is 0.

7. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the sixth lens (6) is a spherical surface with a radius of curvature of 4.4016 mm, and the center thickness of the sixth lens (6) is 0.44 mm; the image surface of the sixth lens (6) is a spherical surface with a radius of curvature of 59.85 mm, and the distance between the image surface of the sixth lens (6) and the center vertex of the object surface of the seventh lens (7) is 1.58 mm.

8. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The object surface of the seventh lens (7) is a spherical surface with a radius of curvature of 14.072 mm, and the center thickness of the seventh lens (7) is 1.493 mm; the image surface of the seventh lens (7) is a plane, and the distance between the image surface of the seventh lens (7) and the center vertex of the protective glass is 4.1 mm.

9. The lens for an 8-megapixel autonomous driving vision system camera according to claim 1, characterized in that: The lens barrel (9) is provided with a limiting mechanism (92) for limiting the first clamping ring (10), the second clamping ring (11) and the third clamping ring (12); the lens barrel (9) is provided with a mounting groove (91); the limiting mechanism (92) comprises a loading block (921); the loading block (921) is installed on the lens barrel (9); the loading block (921) is arranged in the mounting groove (91); a rotating rod (922) is rotatably installed on the loading block (921); and the rotating rod (922) is connected to a lifting frame ( 923), the lifting frame (923) is mounted on the loading block (921), the lifting frame (923) is connected to a first spring (924), one end of the first spring (924) away from the lifting frame (923) is connected to the loading block (921), the first clamping ring (10), the second clamping ring (11) and the third clamping ring (12) are all equipped with a push plate (925) for driving the rotating rod (922) to rotate, and the lens barrel (9) is equipped with a driving component (94) for driving the rotating rod (922) to rotate.

10. The lens for an 8-megapixel autonomous driving vision system camera according to claim 9, characterized in that: The lens barrel (9) is provided with a slide groove (93), and the driving assembly (94) comprises a push rod (941), the push rod (941) is slidably mounted on the lens barrel (9), one end of the push rod (941) extends into the mounting groove (91), the end of the push rod (941) extending into the mounting groove (91) abuts against the rotating rod (922), one end of the push rod (941) extends into the slide groove (93), and the push rod (941) is arranged to rotate relative to the rotating rod (922). One end of the rod (941) extending into the slide groove (93) is connected to a pressing plate (942), the pressing plate (942) is arranged in the slide groove (93), the pressing plate (942) is slidably connected to the lens barrel (9) through the slide groove (93), and a second spring (943) is sleeved on the push rod (941), one end of the second spring (943) is connected to the pressing plate (942), and the other end is connected to the lens barrel (9).

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