Camera lens and video camera

Abstract

This invention proposes a camera lens and imaging device. Based on the field of optical technology, the camera lens includes a first lens group, a second lens group, a third lens group, and an image plane arranged sequentially. The first lens group includes a first lens with positive optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power, arranged sequentially from the object side to the image side. The second lens group includes a fifth lens, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens arranged sequentially from the object side to the image side. The third lens group includes a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with negative optical power, arranged sequentially from the object side to the image side. The fifth and eleventh lenses are glass lenses, and the eighth lens is a plastic lens. The total optical length of the camera lens is TTL, satisfying TTL≤65mm. This solution achieves a camera lens with small size, large aperture, high image quality, and low cost.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and in particular to a camera lens and imaging device. Background Technology

[0002] With the rapid development of social media platforms and the popularity of short video content, more and more users tend to record and share their daily lives with others by shooting vlogs. Users not only pursue high-quality still images but also pay special attention to the expressiveness and stability of video content to ensure viewers have the best viewing experience. This has spurred the rapid growth of the high-performance, portable photography equipment market, especially action cameras that are easy to carry and operate without compromising image quality, which have gained widespread popularity among users.

[0003] Camera lenses play a crucial role in the performance of action cameras. Existing large-aperture camera lenses typically employ complex optical structures to correct aberrations, resulting in a large number of lens elements, bulky size, and heavy weight, making them unsuitable for portable shooting. Some manufacturers have introduced lightweight camera lenses, but these lenses often suffer from reduced edge sharpness, significant chromatic aberration, and poor distortion control at their widest apertures, making it difficult to achieve both a large aperture and high image quality. Summary of the Invention

[0004] The main objective of this invention is to provide a camera lens and imaging device that offers a small size, large aperture, high image quality, and low cost.

[0005] To achieve the above objectives, the present invention proposes a camera lens having an object side and an image side arranged opposite to each other along the optical axis. The camera lens includes a first lens group, a second lens group, a third lens group, and an image plane arranged sequentially from the object side to the image side. The first lens group and the third lens group are fixedly arranged, and the second lens group is movable along the optical axis to achieve focusing. The first lens group includes a first lens with positive optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power, arranged sequentially from the object side to the image side. The second lens group includes a fifth lens, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens arranged sequentially from the object side to the image side. The third lens group includes a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with negative optical power, arranged sequentially from the object side to the image side. Among them, the fifth and eleventh lenses are glass lenses, and the eighth lens is a plastic lens; The total optical length of the camera lens is TTL, which satisfies TTL≤65mm.

[0006] In one embodiment, the camera lens further includes an aperture stop disposed between the first lens group and the second lens group.

[0007] In one embodiment, the camera lens further includes a filter disposed sequentially from the object side to the image side between the eleventh lens and the image plane, the filter being used to filter out stray light.

[0008] In one embodiment, the third lens is cemented to the fourth lens, the sixth lens is cemented to the seventh lens, and the ninth lens is cemented to the tenth lens.

[0009] In one embodiment, the fifth lens, the eighth lens, and the eleventh lens are all aspherical lenses.

[0010] In one embodiment, the optical power of the fifth lens is negative, and the optical power of the eighth lens is negative; The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, and the focal length of the eleventh lens is f11, wherein: 90<f1<130, 60<f2<80, 35<f3<50, -25<f4<-15, -160<f5<-120, -30<f6 <-15, 9<f7<18, -150<f8<-110, 12<f9<17, -16<f10<-9, -120<f11<-85.

[0011] In one embodiment, the optical power of the fifth lens is negative, and the optical power of the eighth lens is negative; The first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens has a refractive index of n11 and a dispersion coefficient of v11. Wherein: 1.85≤n1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15.0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 20.0≤v11≤35.0.

[0012] In one embodiment, the optical power of the fifth lens is positive, and the optical power of the eighth lens is positive; The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, and the focal length of the eleventh lens is f11, wherein: 40<f1<65, 90<f2<120, 30<f3<45, -25<f4<-15, 800<f5<1400, -25<f6 <-15, 9<f7<18, 700<f8<950, 10<f9<20, -20<f10<-10, -110<f11<-80.

[0013] In one embodiment, the optical power of the fifth lens is positive, and the optical power of the eighth lens is positive; The first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens has a refractive index of n11 and a dispersion coefficient of v11. Wherein: 1.85≤n1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15.0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 25.0≤v11≤42.0.

[0014] The present invention also proposes a camera device, the camera device including the above-mentioned camera lens, the camera lens having an object side and an image side arranged opposite to each other along the optical axis, the camera lens including a first lens group, a second lens group, a third lens group and an image plane arranged sequentially from the object side to the image side, wherein the first lens group and the third lens group are fixedly arranged, and the second lens group is movable along the optical axis to achieve focusing; The first lens group includes a first lens with positive optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power, arranged sequentially from the object side to the image side. The second lens group includes a fifth lens, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens arranged sequentially from the object side to the image side. The third lens group includes a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with negative optical power, arranged sequentially from the object side to the image side. Among them, the fifth and eleventh lenses are glass lenses, and the eighth lens is a plastic lens; The total optical length of the camera lens is TTL, which satisfies TTL≤65mm.

[0015] The technical solution provided by this invention compensates for the change in viewing angle during camera zoom by setting a movable second lens group, thereby reducing the impact of lens breathing. By setting the fifth and eleventh lenses as glass lenses and the eighth lens as a plastic lens, the glass and plastic materials can compensate for each other. A reasonable combination of glass-plastic hybrid materials ensures good resolution in high and low temperature environments and significantly reduces lens weight. Furthermore, plastic lenses have a significant cost advantage compared to glass lenses, reducing the overall cost of the camera lens. By reasonably limiting the TTL size, the entire optical system becomes more compact, contributing to the miniaturization of the camera lens. The lens exhibits a smooth light path, allowing for greater light intake while maintaining a more compact structure. Regarding aperture, the aperture value F ≤ F ≤ 1.45, and the image plane height reaches φ27.8mm, enabling clear imaging even in low light. By employing a three-element structure using only eleven lenses and rationally setting the number of lenses and optical power in each lens group, a small-volume, large-aperture, high-image-quality, and low-cost camera lens is achieved. Attached Figure Description

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of a camera lens provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the spherical aberration curve of a mid-range camera lens; Figure 3 for Figure 1 A schematic diagram of the vertical chromatic aberration curve of a camera lens; Figure 4 for Figure 1 A schematic diagram of field curvature distortion in a mid-range camera lens; Figure 5 A schematic diagram of another embodiment of the camera lens provided by the present invention; Figure 6 for Figure 5 A schematic diagram of the spherical aberration curve of a mid-range camera lens; Figure 7 for Figure 5 A schematic diagram of the vertical chromatic aberration curve of a camera lens; Figure 8 for Figure 5 A schematic diagram of field curvature distortion in a camera lens.

[0018] Explanation of icon numbers: 1000. Camera lens; 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 2. Second lens group; 21. Fifth lens; 22. Sixth lens; 23. Seventh lens; 24. Eighth lens; 3. Third lens group; 31. Ninth lens; 32. Tenth lens; 33. Eleventh lens; 4. Aperture stop; 5. Filter; 6. Image plane.

[0019] 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

[0020] 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.

[0021] 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.

[0022] 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.

[0023] With the rapid development of social media platforms and the popularity of short video content, more and more users tend to record and share their daily lives with others by shooting vlogs. Users not only pursue high-quality still images but also pay special attention to the expressiveness and stability of video content to ensure viewers have the best viewing experience. This has spurred the rapid growth of the high-performance, portable photography equipment market, especially action cameras that are easy to carry and operate without compromising image quality, which have gained widespread popularity among users.

[0024] Camera lenses play a crucial role in the performance of action cameras. Existing large-aperture camera lenses typically employ complex optical structures to correct aberrations, resulting in a large number of lens elements, bulky size, and heavy weight, making them unsuitable for portable shooting. Some manufacturers have introduced lightweight camera lenses, but these lenses often suffer from reduced edge sharpness, significant chromatic aberration, and poor distortion control at their widest apertures, making it difficult to achieve both a large aperture and high image quality.

[0025] The main objective of this invention is to provide a camera lens and imaging device that offers a small size, large aperture, high image quality, and low cost.

[0026] Please see Figure 1 and Figure 5 This invention proposes a camera lens 1000, which has an object side and an image side arranged opposite to each other along the optical axis. The camera lens 1000 includes a first lens group 1, a second lens group 2, a third lens group 3, and an image plane 6 arranged sequentially from the object side to the image side. The first lens group 1 and the third lens group 3 are fixedly arranged, while the second lens group 2 is movable along the optical axis to achieve focusing. The first lens group 1 includes a first lens 11 with positive optical power, a second lens 12 with positive optical power, a third lens 13 with positive optical power, and an image plane 6 arranged sequentially from the object side to the image side. The fourth lens 14 has negative optical power; the second lens group 2 includes a fifth lens 21, a sixth lens 22 with negative optical power, a seventh lens 23 with positive optical power, and an eighth lens 24 arranged sequentially from the object side to the image side; the third lens group 3 includes a ninth lens 31 with positive optical power, a tenth lens 32 with negative optical power, and an eleventh lens 33 with negative optical power arranged sequentially from the object side to the image side; wherein, the fifth lens 21 and the eleventh lens 33 are glass lenses, and the eighth lens 24 is a plastic lens; the total optical length of the camera lens 1000 is TTL, satisfying TTL≤65mm.

[0027] The technical solution provided by this invention compensates for the change in viewing angle during camera zoom by setting a movable second lens group 2, thereby reducing the impact of the breathing effect. By setting the fifth lens 21 and eleventh lens 33 as glass lenses and the eighth lens 24 as a plastic lens, the glass and plastic materials can compensate for each other. A reasonable combination of glass-plastic hybrid materials ensures good resolution in high and low temperature environments and significantly reduces lens weight. Furthermore, plastic lenses have a significant cost advantage compared to glass lenses, reducing the cost of the camera lens 1000. By reasonably limiting the TTL size, the entire optical system becomes more compact, contributing to the miniaturization of the camera lens 1000. The lens has a smooth light path, allowing for greater light intake while maintaining a more compact structure. Regarding aperture, the aperture value F satisfies F≤1.45, and the image plane height can reach φ27.8mm, enabling clear imaging even in low light. By adopting a three-element structure, using only eleven lenses, and rationally setting the number of lenses and optical power in each lens group, a camera lens 1000 with small size, large aperture, high image quality, and low cost was achieved.

[0028] Furthermore, the camera lens 1000 also includes an aperture stop 4, which is disposed between the first lens group 1 and the second lens group 2. The aperture stop 4 limits the light beam aperture on the optical axis, blocking some light rays, thereby reducing light spots, improving image contrast, and also improving image quality. Adjusting the light throughput of the aperture stop 4 according to actual conditions helps to further improve image quality.

[0029] Furthermore, the filter 5 is disposed between the eleventh lens 33 and the image plane 6 to filter out stray light in non-operating wavelength bands. The filter 5 can reduce optical noise, thus reducing difficulties for subsequent optoelectronic module processing.

[0030] Furthermore, to improve the image quality of the optical system, reduce light energy loss, increase imaging clarity, protect the scale surface, and further optimize the manufacturing process to meet design requirements, in this embodiment, the third lens 13 and the fourth lens 14 are cemented together, the sixth lens 22 and the seventh lens 23 are cemented together, and the ninth lens 31 and the tenth lens 32 are cemented together. Thus, the reasonable use of cemented components and the reasonable allocation of optical power effectively correct aberrations and achieve a heat-free effect at high and low temperatures. It also effectively reduces chromatic aberration, enabling simultaneous clarity of the confocal plane in both the visible and near-infrared imaging bands.

[0031] Furthermore, the fifth lens 21, the eighth lens 24, and the eleventh lens 33 are all aspherical lenses. It should be noted that the characteristic of aspherical lenses is that the curvature changes continuously from the center to the periphery of the lens, unlike spherical lenses which have a constant curvature from the center to the periphery.

[0032] In the two embodiments provided by the present invention, please refer specifically to... Figure 1 and Figure 5 The first lens 11 is a concave-convex lens with a convex object-side surface; the second lens 12 is a concave-convex lens with a convex object-side surface; the third lens 13 is a concave-convex lens with a convex object-side surface; the fourth lens 14 is a concave-convex lens with a convex object-side surface; the fifth lens 21 is a concave-convex lens with a convex object-side surface; the sixth lens 22 is a biconcave lens; the seventh lens 23 is a biconvex lens; the eighth lens 24 is a concave-convex lens with a concave object-side surface; the ninth lens 31 is a biconvex lens; the tenth lens 32 is a biconcave lens; and the eleventh lens 33 is a concave-convex lens with a convex object-side surface.

[0033] In one embodiment of the present invention, the optical power of the fifth lens 21 is negative, the optical power of the eighth lens 24 is negative, the focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, the focal length of the third lens 13 is f13, the focal length of the fourth lens 14 is f14, the focal length of the fifth lens 21 is f21, the focal length of the sixth lens 22 is f22, the focal length of the seventh lens 23 is f23, and the focal length of the eighth lens 24 is f24. The focal lengths of the ninth lens 31, the tenth lens 32, and the eleventh lens 33 are all f31, f32, and f33, respectively; wherein 90 < f1 < 130, 60 < f2 < 80, 35 < f3 < 50, -25 < f4 < -15, -160 < f5 < -120, -30 < f6 < -15, 9 < f7 < 18, -150 < f8 < -110, 12 < f9 < 17, -16 < f10 < -9, and -120 < f11 < -85. By limiting the focal lengths of each lens, a reasonable combination of optical power can be achieved, allowing light to pass through the camera lens 1000 more smoothly and correcting the impact of aberrations on image quality to a greater extent.

[0034] Further, the first lens 11 has a refractive index of n1 and a dispersion coefficient of v1; the second lens 12 has a refractive index of n2 and a dispersion coefficient of v2; the third lens 13 has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens 14 has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens 21 has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens 22 has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens 23 has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens 24 has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens 31 has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens 32 has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens 33 has a refractive index of n11 and a dispersion coefficient of v11, wherein: 1.85 ≤ n 1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15. 0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 20.0≤v11≤35.0. This embodiment is a preferred embodiment. By combining different lenses and rationally allocating their refractive indices and dispersion coefficients, the camera lens 1000 achieves high image quality and low distortion.

[0035] Furthermore, the diameter of the first lens 1 is D1, and the image plane diameter of the camera lens 1000 is IC, satisfying: D1 < 38mm, 27.5mm ≤ IC ≤ 29.5mm. This design, by limiting the numerical relationships of the aforementioned optical system characteristics, avoids excessively large apertures in the camera lens 1000, thus meeting the installation space requirements of the final product. By limiting the specific values ​​of the total optical length and the diameter of the first lens 11, the lens size can be appropriately limited, contributing to lens miniaturization.

[0036] It is worth mentioning that the surface shape of each aspherical lens in the camera lens 1000 described in this embodiment should satisfy the following equation:

[0037] Where c is the curvature corresponding to the radius; y is the radial coordinate (its unit is the same as the lens length unit); k is the conic conic coefficient, and A, B, C, D, E, F, G, H... represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth... aspherical coefficients, respectively. These parameters allow the setting of the shape and size of the aspherical surfaces facing the object and image sides of the lens.

[0038] Specifically, when k < -1, the corresponding lens surface curve is a hyperbola; when k = -1, the corresponding lens surface curve is a parabola; when -1 < k < 0, the corresponding lens surface curve is an ellipse; when k = 0, the corresponding lens surface curve is a circle; and when k > 0, the corresponding lens surface curve is an oval.

[0039] It should be noted that the basic parameters of the camera lens 1000 in the embodiments provided in this solution are shown in Table 1, where the units of radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0040] Table 1

[0041] It should be noted that, in this embodiment, the positions of the second lens group 2 of the camera lens 1000 at infinity and the closest focusing distance are shown in Table 2, where the units of distance 1 and distance 2 are millimeters (mm).

[0042] Table 2

[0043] In this embodiment, the aspherical coefficients of each aspherical lens in the camera lens 1000 include: the quadratic surface coefficient k, the fourth-order aspherical coefficient A, the sixth-order aspherical coefficient B, the eighth-order aspherical coefficient C, the tenth-order aspherical coefficient D, the twelfth-order aspherical coefficient E, the fourteenth-order aspherical coefficient F, the sixteenth-order aspherical coefficient G, and the eighteenth-order aspherical coefficient H, as shown in Table 3 below.

[0044] Table 3

[0045] Please refer to Figure 2 Figure 1 is a schematic diagram of the spherical aberration curve of the camera lens 1000 in this embodiment. As can be seen from the figure, the spherical aberration of the camera lens 1000 at different wavelengths is controlled within the range of (-0.04mm, +0.05mm), indicating that the spherical aberration of the camera lens 1000 is well controlled.

[0046] Please refer to Figure 3Figure 1 is a schematic diagram of the chromatic aberration curve of the camera lens 1000 in this embodiment. As can be seen from the figure, the chromatic aberration of the camera lens 1000 at different wavelengths is controlled within the range of (-1μm, +6μm), indicating that the chromatic aberration of the camera lens 1000 is well controlled and can meet the requirements of wide spectrum application across the entire wavelength range.

[0047] Please refer to Figure 4 This diagram illustrates the field curvature distortion of the camera lens 1000 in this embodiment. Different colors represent different wavelengths. For the same color, the right curve represents the meridional direction, and the left curve represents the sagittal field curvature. The diagram shows that the sagittal field curvature of this lens is no greater than 0.08mm, indicating that the lens can effectively correct chromatic aberration. The other curve in the diagram is the system distortion curve. Distortion does not affect the system's sharpness, but it can cause image distortion. The optical distortion of this lens is less than 4%.

[0048] In this embodiment, the camera lens 1000 has a focal length of 43mm, an aperture of f / 1.43, an image plane diameter of 27.8mm, and a diagonal field of view of 34.5°. While having a large field of view, various aberrations of the lens are corrected, resulting in high image quality. It can also produce clear images in low light, and the lens size is small, resulting in low manufacturing cost.

[0049] In another embodiment of the present invention, the optical power of the fifth lens 21 is positive, the optical power of the eighth lens 24 is positive, the focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, the focal length of the third lens 13 is f13, the focal length of the fourth lens 14 is f14, the focal length of the fifth lens 21 is f21, the focal length of the sixth lens 22 is f22, the focal length of the seventh lens 23 is f23, and the focal length of the eighth lens 24 is f11. 24. The focal length of the ninth lens 31 is f31, the focal length of the tenth lens 32 is f32, and the focal length of the eleventh lens 33 is f33; wherein, 40 < f1 < 65, 90 < f2 < 120, 30 < f3 < 45, -25 < f4 < -15, 800 < f5 < 1400, -25 < f6 < -15, 9 < f7 < 18, 700 < f8 < 950, 10 < f9 < 20, -20 < f10 < -10, -110 < f11 < -80. By limiting the focal length of each lens, a reasonable combination of the optical power of each lens can be achieved, allowing light to pass through the camera lens 1000 more smoothly and correcting the impact of aberrations on image quality to a greater extent.

[0050] Further, the first lens 11 has a refractive index of n1 and a dispersion coefficient of v1; the second lens 12 has a refractive index of n2 and a dispersion coefficient of v2; the third lens 13 has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens 14 has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens 21 has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens 22 has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens 23 has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens 24 has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens 31 has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens 32 has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens 33 has a refractive index of n11 and a dispersion coefficient of v11, wherein: 1.85 ≤ n 1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15. 0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 25.0≤v11≤42.0. This embodiment is a preferred embodiment. By combining different lenses and rationally allocating their refractive indices and dispersion coefficients, the camera lens 1000 achieves high image quality and low distortion.

[0051] Furthermore, the diameter of the first lens 1 is D1, and the image plane diameter of the camera lens 1000 is IC, satisfying: D1 < 34mm, 27.5mm ≤ IC ≤ 29.5mm. This design, by limiting the numerical relationships of the aforementioned optical system characteristics, avoids excessively large apertures in the camera lens 1000, thus meeting the installation space requirements of the final product. By limiting the specific values ​​of the total optical length and the diameter of the first lens 11, the lens size can be appropriately limited, contributing to lens miniaturization.

[0052] It is worth mentioning that the surface shape of each aspherical lens in the camera lens 1000 described in this embodiment should satisfy the following equation:

[0053] Where c is the curvature corresponding to the radius; y is the radial coordinate (its unit is the same as the lens length unit); k is the conic conic coefficient, and A, B, C, D, E, F, G, H... represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth... aspherical coefficients, respectively. These parameters allow the setting of the shape and size of the aspherical surfaces facing the object and image sides of the lens.

[0054] Specifically, when k < -1, the corresponding lens surface curve is a hyperbola; when k = -1, the corresponding lens surface curve is a parabola; when -1 < k < 0, the corresponding lens surface curve is an ellipse; when k = 0, the corresponding lens surface curve is a circle; and when k > 0, the corresponding lens surface curve is an oval.

[0055] It should be noted that, in another embodiment of this solution, the basic parameters of the camera lens 1000 are shown in Table 4, where the units of radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0056] Table 4

[0057] It should be noted that, in this embodiment, the positions of the second lens group 2 of the camera lens 1000 at infinity and the closest focusing distance are shown in Table 5, where the units of distance 3 and distance 4 are millimeters (mm).

[0058] Table 5

[0059] In this embodiment, the aspherical coefficients of each aspherical lens in the camera lens 1000 include: the quadratic surface coefficient k, the fourth-order aspherical coefficient A, the sixth-order aspherical coefficient B, the eighth-order aspherical coefficient C, the tenth-order aspherical coefficient D, the twelfth-order aspherical coefficient E, the fourteenth-order aspherical coefficient F, the sixteenth-order aspherical coefficient G, and the eighteenth-order aspherical coefficient H, as shown in Table 6 below.

[0060] Table 6

[0061] Please refer to Figure 6 Figure 1 is a schematic diagram of the spherical aberration curve of the camera lens 1000 in this embodiment. As can be seen from the figure, the spherical aberration of the camera lens 1000 at different wavelengths is controlled within the range of (-0.02mm, +0.06mm), indicating that the spherical aberration of the camera lens 1000 is well controlled.

[0062] Please refer to Figure 7Figure 1 is a schematic diagram of the chromatic aberration curve of the camera lens 1000 in this embodiment. As can be seen from the figure, the chromatic aberration of the camera lens 1000 at different wavelengths is controlled within the range of (-1μm, +5μm), indicating that the chromatic aberration of the camera lens 1000 is well controlled and can meet the requirements of wide spectrum application across the entire wavelength range.

[0063] Please refer to Figure 8 This diagram illustrates the field curvature distortion of the camera lens 1000 in this embodiment. Different colors represent different wavelengths. For the same color, the right curve represents the meridional direction, and the left curve represents the sagittal field curvature. The diagram shows that the sagittal field curvature of this lens is no greater than 0.14mm, indicating that the lens can effectively correct chromatic aberration. The other curve in the diagram is the system distortion curve. Distortion does not affect the system's sharpness, but it can cause image distortion. The optical distortion of this lens is less than 2%.

[0064] In this embodiment, the camera lens 1000 has a focal length of 43mm, an aperture of 1.45, an image plane diameter of 27.8mm, and a diagonal field of view of 35.2°. While having a large field of view, various aberrations of the lens are corrected, resulting in high image quality. It can also produce clear images in low light conditions. Furthermore, the lens is small in size and has a low manufacturing cost.

[0065] The present invention also proposes a camera device, which includes the camera lens 1000 described above. Since the camera device includes the camera lens 1000, the specific structure of the camera lens 1000 is as described in the above embodiments. Since the camera lens 1000 of the present camera device 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.

[0066] 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 camera lens, characterized in that, The camera lens has an object side and an image side that are arranged opposite to each other along the optical axis. The camera lens is composed of a first lens group, a second lens group, a third lens group and an image plane arranged sequentially from the object side to the image side. The first lens group and the third lens group are fixedly arranged, and the second lens group is movable along the optical axis to achieve focusing. The first lens group consists of a first lens with positive optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power, arranged sequentially from the object side to the image side. The second lens group consists of a fifth lens, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens arranged sequentially from the object side to the image side. The third lens group consists of a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with negative optical power arranged sequentially from the object side to the image side. Among them, the fifth and eleventh lenses are glass lenses, and the eighth lens is a plastic lens; The total optical length of the camera lens is TTL, which satisfies TTL≤65mm; The first lens group has positive optical power, the second lens group has negative optical power, and the third lens group has negative optical power; The optical power of the fifth lens and the optical power of the eighth lens are both set to positive values, or both are set to negative values.

2. The camera lens as described in claim 1, characterized in that, The camera lens also includes an aperture stop, which is located between the first lens group and the second lens group.

3. The camera lens as described in claim 1, characterized in that, The camera lens also includes a filter disposed sequentially from the object side to the image side between the eleventh lens and the image plane, the filter being used to filter out stray light.

4. The camera lens as described in claim 1, characterized in that, The third lens is cemented to the fourth lens, the sixth lens is cemented to the seventh lens, and the ninth lens is cemented to the tenth lens.

5. The camera lens as described in claim 1, characterized in that, The fifth, eighth, and eleventh lenses are all aspherical lenses.

6. The camera lens as described in claim 1, characterized in that, The optical power of the fifth lens is negative, and the optical power of the eighth lens is negative; The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, and the focal length of the eleventh lens is f11, wherein: 90<f1<130, 60<f2<80, 35<f3<50, -25<f4<-15, -160<f5<-120, -30<f6 <-15, 9<f7<18, -150<f8<-110, 12<f9<17, -16<f10<-9, -120<f11<-85.

7. The camera lens as described in claim 1, characterized in that, The optical power of the fifth lens is negative, and the optical power of the eighth lens is negative; The first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens has a refractive index of n11 and a dispersion coefficient of v11. Wherein: 1.85≤n1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15.0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 20.0≤v11≤35.

0.

8. The camera lens as described in claim 1, characterized in that, The optical power of the fifth lens is positive, and the optical power of the eighth lens is positive. The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, and the focal length of the eleventh lens is f11, wherein: 40<f1<65, 90<f2<120, 30<f3<45, -25<f4<-15, 800<f5<1400, -25<f6 <-15, 9<f7<18, 700<f8<950, 10<f9<20, -20<f10<-10, -110<f11<-80.

9. The camera lens as described in claim 1, characterized in that, The optical power of the fifth lens is positive, and the optical power of the eighth lens is positive. The first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; the tenth lens has a refractive index of n10 and a dispersion coefficient of v10; and the eleventh lens has a refractive index of n11 and a dispersion coefficient of v11. Wherein: 1.85≤n1≤2.05, 1.43≤n2≤1.65, 1.43≤n3≤1.65, 1.80≤n4≤1.95, 1.70≤n5≤1.86, 1.60≤n6≤1.80, 1.80≤n7≤1.95, 1.50≤n8≤1.65, 1.75≤n9≤1.95, 1.75≤n10≤1.95, 1.70≤n11≤1.85, 15.0≤v1≤30.0, 60.0≤v2≤95.0, 60.0≤v3≤95.0, 15.0≤v4≤30.0, 30.0≤v5≤45.0, 23.0≤v6≤35.0, 30.0≤v7≤45.0, 50.0≤v8≤65.0, 18.0≤v9≤30.0, 18.0≤v10≤30.0, 25.0≤v11≤42.

0.

10. A camera device, characterized in that, Includes the camera lens as described in any one of claims 1 to 9.

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