Large-image-plane video small lens and camera
By combining eight lenses, including plastic and glass aspherical lenses, and optimizing the light path, the design solves the problems of small imaging surface, large size and vignetting of existing optical lenses, achieving high resolution and compact imaging effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UNION OPTECH
- Filing Date
- 2025-12-29
- Publication Date
- 2026-04-28
AI Technical Summary
Existing optical lenses suffer from problems such as small imaging surface, large size and poor imaging effect, especially in meeting the requirements of small-size assembly, and have slight vignetting and stray light interference.
It adopts an eight-lens combination design, including plastic aspherical lenses and glass aspherical lenses. Through the arrangement and combination of lenses, material selection and parameter design, it achieves high resolution and compact size of large image sensor lens. Apertures and filters are used to optimize the light path to reduce distortion and stray light.
It achieves a resolution of 12M or higher and distortion of less than or equal to 6%. The lens is compact and suitable for portable devices, with excellent imaging performance, solving the problems of small imaging area, large size and vignetting.
Smart Images
Figure CN121934239A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical lens technology, and in particular to a small video lens with a large image sensor and a camera. Background Technology
[0002] Existing optical lenses have the following drawbacks: for lenses of the same size, the imaging surface is small; large imaging surface video lenses are too large to meet the assembly requirements of small sizes; large imaging surface lenses of the same size also have poor imaging effects and slight vignetting at the edges.
[0003] Therefore, a lens with a large imaging surface, good imaging effect, and small size is needed to meet the usage requirements. Summary of the Invention
[0004] The main objective of this invention is to provide a large-image-area video lens and camera, aiming to provide a lens with a large imaging surface, good imaging effect, and small size.
[0005] To achieve the above objectives, the present invention proposes a large-image-size video lens having an object side and an image side arranged opposite each other along the optical axis. The large-image-size video lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side. The first lens, second lens, fourth lens, fifth lens, seventh lens, and eighth lens are plastic aspherical lenses, while the third lens and sixth lens are glass aspherical lenses. This ensures that the resolution of the large-image-size video lens is greater than or equal to 12M, the image plane height φ of the large-image-size video lens, and the total optical length of the large-image-size video lens is TTL. <TTL / φ≤1.5 In one embodiment, the optical focal length of the large-image-size video lens is f, and the total optical length of the large-image-size video lens is TTL, satisfying the following relationship: 3.6≤TTL / f≤4.5.
[0006] In one embodiment, the first lens, the second lens, and the third lens constitute a first lens group, and the focal length of the first lens group is f1, where 0.1 ≤ f / f1 ≤ 0.35; The fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens constitute a second lens group, and the focal length of the second lens group is f2, 1≤f / f2≤2.
[0007] In one implementation, The focal length of the first lens is f11, and -0.35 ≤ f1 / f11 ≤ -0.15; The focal length of the second lens is f12, -0.65≤f1 / f12≤-0.40; The focal length of the third lens is f13, and 3.00≤f1 / f13≤5.50; The focal length of the fourth lens is f21, and 0.40≤f2 / f21≤0.80; The focal length of the fifth lens is f22, -0.30≤f2 / f22≤-0.10; The focal length of the sixth lens is f23, and 0.90 ≤ f2 / f23 ≤ 1.30; The focal length of the seventh lens is f24, -0.70≤f2 / f24≤-0.40; The focal length of the eighth lens is f25, and 0.08≤f2 / f25≤0.15.
[0008] In one implementation, The refractive index of the first lens is nd1, where 1.533 ≤ nd1 ≤ 1.537. The refractive index of the second lens is nd2, 1.658 ≤ nd2 ≤ 1.662; The refractive index of the third lens is nd3, 1.849 ≤ nd3 ≤ 1.853; The refractive index of the fourth lens is nd4, where 1.533 ≤ nd4 ≤ 1.537; The refractive index of the fifth lens is nd5, 1.659 ≤ nd5 ≤ 1.663; The refractive index of the sixth lens is nd6, where 1.496 ≤ nd6 ≤ 1.498; The refractive index of the seventh lens is nd7, where 1.634 ≤ nd7 ≤ 1.638. The refractive index of the eighth lens is nd8, where 1.533 ≤ nd8 ≤ 1.537.
[0009] In one implementation, The Abbe number of the first lens is vd1, 55.074 ≤ vd1 ≤ 56.186; The Abbe number of the second lens is vd2, 20.177 ≤ vd2 ≤ 20.585; The Abbe number of the third lens is vd3, 39.699 ≤ vd3 ≤ 40.501; The Abbe number of the fourth lens is vd4, 55.074 ≤ vd4 ≤ 56.186; The Abbe number of the fifth lens is vd5, 20.177 ≤ vd5 ≤ 20.585; The Abbe number of the sixth lens is vd6, 80.743 ≤ vd6 ≤ 82.375; The Abbe number of the seventh lens is vd7, 23.677 ≤ vd7 ≤ 24.155; The Abbe number of the eighth lens is vd8, 55.078 ≤ vd8 ≤ 56.190.
[0010] In one embodiment, the horizontal field of view of the large-screen video lens is HFOV, HFOV≥98° and the TV distortion of the large-screen video lens is less than or equal to 6%.
[0011] In one embodiment, the large-image-size video lens further includes an aperture stop, which is disposed between the third lens and the fourth lens.
[0012] In one embodiment, the large-image-size video lens further includes a filter disposed on the image side of the eighth lens.
[0013] This invention also proposes a camera comprising a large-image-size video lens, wherein the large-image-size video lens has an object side and an image side arranged opposite each other along the optical axis, and includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side; wherein the first lens, the second lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens are plastic aspherical lenses, and the third lens and the sixth lens are glass aspherical lenses; such that the resolution of the large-image-size video lens is greater than or equal to 12M, the image plane height φ of the large-image-size video lens, and the total optical length of the large-image-size video lens is TTL, 1 <TTL / φ≤1.5。
[0014] The technical solution of this invention achieves the technical effect of large imaging surface, good imaging effect and small size by setting eight lenses, and by arranging and combining the lenses, selecting materials, allocating surface shape and designing parameters. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0016] Figure 1 A schematic diagram of the structure of an embodiment of the large-image-size video lens provided by the present invention; Figure 2 for Figure 1MTF chart of a small lens for large-format video cameras; Figure 3 for Figure 1 A schematic diagram of the light aberration curve of a medium-sized image sensor lens; Figure 4 for Figure 1 A schematic diagram of the longitudinal aberration curve of a small lens for medium-sized image sensors; Figure 5 for Figure 1 A schematic diagram of the lateral chromatic aberration curve of a medium-sized image sensor lens.
[0017] Explanation of icon numbers: 100. Large image sensor small lens; 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 2. Second lens group; 21. Fourth lens; 22. Fifth lens; 23. Sixth lens; 24. Seventh lens; 25. Eighth lens; 3. Aperture; 4. Filter.
[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0022] Existing optical lenses have the following drawbacks: for lenses of the same size, the imaging surface is small; large imaging surface video lenses are too large to meet the assembly requirements of small sizes; large imaging surface lenses of the same size also have poor imaging effects and slight vignetting at the edges.
[0023] This invention proposes a small lens for large image sensor.
[0024] Please see Figure 1 In one embodiment of the present invention, the large-image-size video lens 100 has an object side and an image side arranged opposite to each other along the optical axis. The large-image-size video lens 100 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 21, a fifth lens 22, a sixth lens 23, a seventh lens 24, and an eighth lens 25 arranged sequentially from the object side to the image side. The first lens 11, the second lens 12, the fourth lens 21, the fifth lens 22, the seventh lens 24, and the eighth lens 25 are plastic aspherical lenses, and the third lens 13 and the sixth lens 23 are glass aspherical lenses. This ensures that the resolution of the large-image-size video lens 100 is greater than or equal to 12M, the image plane height φ of the large-image-size video lens 100, and the total optical length of the large-image-size video lens 100 is TTL. <TTL / φ≤1.5。
[0025] The technical solution of this invention adopts an 8-element structure with plastic aspherical lenses as the main component and glass aspherical lenses as the auxiliary component. This structure not only utilizes the low cost and easy processing advantages of plastic lenses to control the overall cost and volume, but also uses the high optical stability of glass lenses to correct key aberrations, thus achieving a balance between image quality and cost.
[0026] The first lens 11 is set as a plastic aspherical lens, which is responsible for initially converging light. The aspherical design reduces spherical aberration, and the plastic material reduces costs and facilitates the machining of complex surfaces. The second lens 12 is set as a plastic aspherical lens, which cooperates with the first lens 11 to correct chromatic aberration / distortion and further optimize the light propagation path. The third lens 13 is set as a glass aspherical lens. The glass material has strong refractive index stability and low dispersion coefficient, and is used to accurately correct high-order aberrations and improve the sharpness of the image quality. The fourth lens 21 is set as a plastic aspherical lens, which can balance the volume of the large image plane video small lens 100 and the imaging quality. The aspherical plastic can flexibly adjust the curvature to adapt to the overall optical design. The fifth lens 22 is set as a plastic aspherical lens, which forms a combination with the fourth lens 21 to further compensate for aberrations and ensure the consistency of the edge image quality. The sixth lens 23 is set as a glass aspherical lens, and the remaining aberrations are corrected again through the high stability of the glass material, especially optimizing the imaging performance under a wide spectrum (such as color reproduction). The seventh lens 24 is set as a plastic aspherical lens, which can be used to finely adjust the light angle, adapt to the subsequent eighth lens 25 and the image plane sensor, and improve the light converging efficiency. The eighth lens 25 is set as a plastic aspherical lens, which finally corrects the light, ensures that the light is incident perpendicularly on the image plane, reduces edge blurring, and at the same time controls the total length of the large image plane video small lens 100. Finally, the resolution of the large image plane video small lens 100 meets the performance requirements of being greater than or equal to 12M, the image plane height φ of the large image plane video small lens 100, and the optical total length of the large image plane video small lens is TTL, where 1 < TTL / φ ≤ 1.5.
[0027] In one embodiment, the large-image-size video lens 100 has an optical focal length of f and an optical total length of TTL, satisfying the following relationship: 3.6≤TTL / f≤4.5. f (optical focal length): The core optical parameter of the large-screen video lens 100, which determines the field of view (the smaller the f, the wider the field of view; the larger the f, the narrower the field of view and the higher the magnification); TTL (total optical length): The total length from the object-side vertex of the large-screen video lens 100 to the image plane, which is the core indicator for measuring the compactness of the large-screen video lens 100; TTL / f (total length-to-focal length ratio): Essentially the ratio of the physical length of the large-screen video lens 100 to the optical focal length, which reflects the compactness of the large-screen video lens 100 at a specific focal length—the smaller the ratio, the more "compact" the large-screen video lens 100 (shorter TTL at the same focal length); the larger the ratio, the relatively longer the large-screen video lens 100 (longer TTL at the same focal length). The relationship 3.6≤TTL / f≤4.5 is the "core balancer" in the design of the large-screen video lens 100: Upper limit (≤4.5): Controls "size", ensuring that the large-screen video lens 100 is thin and light, and suitable for portable devices; Lower limit (≥3.6): Preserves "image quality", leaving enough space for aberration correction and light convergence of the 8-element lens, ensuring that the 12M+ resolution is met; Overall significance: Finding the optimal solution among "high-definition imaging", "compact size" and "mass production cost", so that the large-screen video lens 100 can meet the usage needs of mid-to-high-end portable devices and also has the feasibility of industrial mass production.
[0028] In one embodiment, the first lens 11, the second lens 12, and the third lens 13 constitute a first lens group 1, with a focal length of f1, where 0.1 ≤ f / f1 ≤ 0.35. The fourth lens 21, the fifth lens 22, the sixth lens 23, the seventh lens 24, and the eighth lens 25 constitute a second lens group 2, with a focal length of f2, where 1 ≤ f / f2 ≤ 2. This constraint on the focal length ratio of the two lens groups is to achieve different functions: the first lens group 1, with its low-light power (0.1 ≤ f / f1 ≤ 0.35), is responsible for "controlling the viewing angle, astigmatism, and stabilizing light," laying the foundation for high-definition imaging, while simultaneously controlling the size of the front group to ensure a compact TTL (Time-To-Lapse) display. The second lens group 2, with its medium-to-high-light power (1 ≤ f / f2 ≤ 2), is responsible for "correcting aberrations and adapting to the image plane," ultimately achieving a resolution of 12M+, while avoiding excessive size.
[0029] To achieve the aforementioned large-image-size video lens 100 effect, the lens parameters are designed as follows: Regarding the focal lengths of the lenses: the focal length of the first lens 11 is f11, -0.35≤f1 / f11≤-0.15; the focal length of the second lens 12 is f12, -0.65≤f1 / f12≤-0.40; the focal length of the third lens 13 is f13, 3.00≤f1 / f13≤5.50; and the focal length of the fourth lens 21 is f21, 0.40≤f2 / f21≤0. The focal length of the fifth lens 22 is f22, -0.30≤f2 / f22≤-0.10; the focal length of the sixth lens 23 is f23, 0.90≤f2 / f23≤1.30; the focal length of the seventh lens 24 is f24, -0.70≤f2 / f24≤-0.40; the focal length of the eighth lens 25 is f25, 0.08≤f2 / f25≤0.15.
[0030] Regarding the refractive indices of the lenses: the first lens 11 has a refractive index of nd1, 1.533≤nd1≤1.537; the second lens 12 has a refractive index of nd2, 1.658≤nd2≤1.662; the third lens 13 has a refractive index of nd3, 1.849≤nd3≤1.853; the fourth lens 21 has a refractive index of nd4, 1.533≤nd4≤1.537; the fifth lens 22 has a refractive index of nd5, 1.659≤nd5≤1.663; the sixth lens 23 has a refractive index of nd6, 1.496≤nd6≤1.498; the seventh lens 24 has a refractive index of nd7, 1.634≤nd7≤1.638; and the eighth lens 25 has a refractive index of nd8, 1.533≤nd8≤1.537.
[0031] Regarding the Abbe number of the lenses: the Abbe number of the first lens 11 is vd1, 55.074≤vd1≤56.186; the Abbe number of the second lens 12 is vd2, 20.177≤vd2≤20.585; the Abbe number of the third lens 13 is vd3, 39.699≤vd3≤40.501; and the Abbe number of the fourth lens 21 is vd4, 55.074≤vd4≤56. 186; The Abbe number of the fifth lens 22 is vd5, 20.177≤vd5≤20.585; the Abbe number of the sixth lens 23 is vd6, 80.743≤vd6≤82.375; the Abbe number of the seventh lens 24 is vd7, 23.677≤vd7≤24.155; the Abbe number of the eighth lens 25 is vd8, 55.078≤vd8≤56.190. With the design, arrangement, and combination of the above eight lenses, the horizontal viewing angle of the large-image-plane video lens 100 is HFOV, HFOV≥98°, and the TV distortion of the large-image-plane video lens 100 is less than or equal to 6%. HFOV≥98°: Defines the "ultra-wide-angle" functional attribute to meet users' needs for shooting large scenes, while controlling the difficulty of optical design and adapting to a compact size (TTL≤15.6mm); TV distortion≤6%: Ensures the practicality of the image, avoids distortion affecting the user experience, and matches the image quality requirements of 12M+ high-definition resolution; These two constraints are the final performance verification of "eight-lens grouping, multi-material aspherical surface, and focal length ratio": If HFOV≥98° and TV distortion≤6% cannot be met at the same time, it indicates that there are design flaws in the previous lens grouping, focal length ratio, and material selection; If both are met simultaneously, it proves that the large-screen video small lens 100 has achieved system optimization in "field of view, image quality, size, and cost", and is a mature mass-produced product.
[0032] The aperture stop 3 is a light-blocking element in the large-image-size video lens 100. Its core functions are: controlling the amount of light entering the sensor by adjusting the aperture size of the aperture stop 3 to adapt to different lighting environments (such as reducing the aperture in strong light and increasing the aperture in weak light) to ensure normal sensor exposure; and defining the "effective aperture" by determining the imaging beam range of the large-image-size video lens 100, filtering out stray light from the edges, and reducing the impact of stray light on image quality. In one embodiment, the large-image-size video lens 100 further includes the aperture stop 3, which is disposed between the third lens 13 and the fourth lens 21. Aperture 3 is placed between the two lens groups, which is equivalent to a "light filtering node": After the first lens group 1 initially straightens the light from the large field of view, aperture 3 filters out stray light that diverges at the edges and is prone to aberrations, allowing only the core light beam that "meets the imaging requirements" to enter the second lens group 2; the second lens group 2 no longer needs to process a large amount of stray light, and can focus on accurately correcting residual aberrations, greatly improving correction efficiency and ensuring 12M+ resolution and ≤6% low distortion (especially avoiding the accumulation of aberrations at the edge of the ultra-wide angle). The core pain points of the ultra-wide-angle large-format video lens 100 (HFOV≥98°) are "insufficient edge illumination (vignetting)" and "stray light interference". This layout can specifically solve these problems: 1. Avoid vignetting: The aperture 3 is located in the middle of the large-format video lens 100 (the middle position of the 8 lenses). The distance from the object side and the image side is relatively balanced, which allows light from the edge of the large angle to pass more smoothly and reduces the edge vignetting caused by the aperture 3 blocking the light (if the aperture 3 is too close to the object side, it will seriously block the ultra-wide-angle edge light; if it is too close to the image side, it will cause the beam to converge excessively, and the vignetting will be aggravated); 2. Suppress stray light: The stray light generated by the reflection and refraction of the lens surface of the first lens group 1 (especially the third lens 13 which is a glass aspherical surface) will be directly blocked by the aperture 3 and cannot enter the second lens group 2 to reach the image plane, avoiding glare and ghosting (such as flare when shooting against the light) in the image, and improving the image contrast and color reproduction.
[0033] The core function of filter 4 is to filter harmful light and protect the sensor, while not interfering with the imaging optical path, perfectly meeting the core requirements of "high definition + portability". Therefore, filter 4 is disposed on the image side of the eighth lens 25.
[0034] The present invention also proposes a camera, which includes a large-image-size video lens 100. The specific structure of the large-image-size video lens 100 is as described in the above embodiments. Since the camera adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The large-image-size video lens 100 has an object side and an image side arranged opposite each other along the optical axis. The large-image-size video lens 100 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 21, a fifth lens 22, a sixth lens 23, a seventh lens 24, and an eighth lens 25 arranged sequentially from the object side to the image side. The first lens 11, second lens 12, fourth lens 21, fifth lens 22, seventh lens 24, and eighth lens 25 are plastic aspherical lenses, while the third lens 13 and sixth lens 23 are glass aspherical lenses. This ensures that the resolution of the large-image-size video lens 100 is greater than or equal to 12M, the image plane height φ of the large-image-size video lens 100, and the total optical length of the large-image-size video lens 100 is TTL. <TTL / φ≤1.5。
[0035] Specific parameters for one embodiment of the present invention are as follows: The large-image-size video lens 100 in this embodiment has a focal length f = 3.96mm, an image diameter of 11.7mm, a TV distortion of 3.5%, a wavelength range of 436mm-656mm, and a TTL of 15.6mm.
[0036]
[0037] The table below shows one design value for the aspherical coefficient in the 100 large-image-size video lens: The surface profile of an aspherical lens satisfies the formula:
[0038] Where z represents the axial sagitta in the Z-direction of the aspherical surface; y represents the height of the aspherical surface; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; and k represents the conic coefficient.
[0039]
[0040] in, Figures 2 to 5 This is a simulation diagram of this embodiment.
[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A small video lens with a large image sensor, characterized in that, The large-image-size video lens has an object side and an image side arranged opposite to each other along the optical axis. The large-image-size video lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side. Among them, the first lens, the second lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens are plastic aspherical lenses, and the third lens and the sixth lens are glass aspherical lenses. The resolution of the large-image-size video lens is greater than or equal to 12M, the image plane height φ of the large-image-size video lens, and the total optical length of the large-image-size video lens are TTL, 1 <TTL / φ≤1.5。 2. The large-image-size video lens as described in claim 1, characterized in that, The large-image-size video lens has an optical focal length of f and a total optical length of TTL, satisfying the following relationship: 3.6≤TTL / f≤4.
5.
3. The large-image-size video lens as described in claim 2, characterized in that, The first lens, the second lens, and the third lens constitute a first lens group, and the focal length of the first lens group is f1, 0.1≤f / f1≤0.35; The fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens constitute a second lens group, and the focal length of the second lens group is f2, 1≤f / f2≤2.
4. The large-image-size video lens as described in claim 3, characterized in that, The focal length of the first lens is f11, and -0.35 ≤ f1 / f11 ≤ -0.15; The focal length of the second lens is f12, -0.65≤f1 / f12≤-0.40; The focal length of the third lens is f13, and 3.00≤f1 / f13≤5.50; The focal length of the fourth lens is f21, and 0.40≤f2 / f21≤0.80; The focal length of the fifth lens is f22, -0.30≤f2 / f22≤-0.10; The focal length of the sixth lens is f23, and 0.90 ≤ f2 / f23 ≤ 1.30; The focal length of the seventh lens is f24, -0.70≤f2 / f24≤-0.40; The focal length of the eighth lens is f25, and 0.08≤f2 / f25≤0.
15.
5. The large-image-size video lens as described in claim 1, characterized in that, The refractive index of the first lens is nd1, where 1.533 ≤ nd1 ≤ 1.
537. The refractive index of the second lens is nd2, 1.658 ≤ nd2 ≤ 1.662; The refractive index of the third lens is nd3, 1.849 ≤ nd3 ≤ 1.853; The refractive index of the fourth lens is nd4, where 1.533 ≤ nd4 ≤ 1.537; The refractive index of the fifth lens is nd5, 1.659 ≤ nd5 ≤ 1.663; The refractive index of the sixth lens is nd6, where 1.496 ≤ nd6 ≤ 1.498; The refractive index of the seventh lens is nd7, where 1.634 ≤ nd7 ≤ 1.
638. The refractive index of the eighth lens is nd8, where 1.533 ≤ nd8 ≤ 1.
537.
6. The large-image-size video lens as described in claim 1, characterized in that, The Abbe number of the first lens is vd1, 55.074 ≤ vd1 ≤ 56.186; The Abbe number of the second lens is vd2, 20.177 ≤ vd2 ≤ 20.585; The Abbe number of the third lens is vd3, 39.699 ≤ vd3 ≤ 40.501; The Abbe number of the fourth lens is vd4, 55.074 ≤ vd4 ≤ 56.186; The Abbe number of the fifth lens is vd5, 20.177 ≤ vd5 ≤ 20.585; The Abbe number of the sixth lens is vd6, 80.743 ≤ vd6 ≤ 82.375; The Abbe number of the seventh lens is vd7, 23.677 ≤ vd7 ≤ 24.155; The Abbe number of the eighth lens is vd8, 55.078 ≤ vd8 ≤ 56.
190.
7. The large-image-size video lens as described in claim 1, characterized in that, The horizontal field of view of the large-screen video lens is HFOV, HFOV≥98° and the TV distortion of the large-screen video lens is less than or equal to 6%.
8. The large-image-size video lens as described in claim 1, characterized in that, The large-image-size video lens also includes an aperture stop, which is disposed between the third lens and the fourth lens.
9. The large-image-size video lens as described in claim 1, characterized in that, The large-image-size video lens also includes a filter, which is disposed on the image side of the eighth lens.
10. A camera, characterized in that, Including the large-image-size video lens as described in any one of claims 1 to 9.