Optical lens
By combining the specific optical power and surface shape of seven lenses, the imaging problem of automotive optical lenses under low-light conditions is solved, achieving high-pixel and high-resolution imaging effects, which are suitable for ADAS systems.
Patent Information
- Application Number
- CN202510743204.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2045-06-05
AI Technical Summary
Existing automotive optical lenses perform poorly in low-light conditions, making it difficult to meet the high pixel and high resolution requirements of ADAS systems.
Employing a seven-lens structure, a combination of specific optical power and surface shape, including lens combinations with negative and positive optical power, the imaging quality of the optical lens is optimized through reasonable optical power allocation and aperture stop position.
It improves the imaging quality of the optical lens, reduces aberrations, and achieves imaging effects with a large target area and large aperture, making it suitable for high-definition imaging under low-light conditions.
Smart Images
Figure CN120522858B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND
[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and vehicle optical lenses are playing an increasingly important role in the automobile industry.
[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving. It collects environmental information through various lenses and sensors to ensure the safety of drivers. In addition to the requirements of light, thin, small shape and high pixel, high resolution of the existing ADAS system lens, the optical lens is required to be able to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY
[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.
[0005] The technical scheme adopted by the present application is:
[0006] An optical lens, a total of seven lenses, including in order along the optical axis from the object side to the imaging surface:
[0007] The first lens with negative focal power, the object side surface is concave, and the image side surface is concave;
[0008] The second lens with positive focal power, the object side surface is convex, and the image side surface is concave;
[0009] The third lens with negative focal power, the object side surface is concave, and the image side surface is concave;
[0010] The fourth lens with positive focal power, the object side surface is convex, and the image side surface is convex;
[0011] The fifth lens with positive focal power, the object side surface is convex, and the image side surface is concave;
[0012] The sixth lens with negative focal power, the object side surface is convex, and the image side surface is concave;
[0013] The seventh lens with positive focal power, the object side surface is convex, and the image side surface is convex;
[0014] Wherein, the focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy: -1.3 < f3 / f5 < -1.2;
[0015] The focal length f3 of the third lens and the focal length f7 of the seventh lens satisfy: -2 < f3 / f7 < -1.8.
[0016] Further preferably, the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.7 < TTL / f < 5; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 4.6 < TTL / IH < 4.8.
[0017] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1 < IH / f < 1.1; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.3 < BFL / f < 1.4.
[0018] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.3 < f1 / f < -1.1; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 2.6 < f2 / f < 2.9.
[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -2.6 < f3 / f < -2.4; the object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.9 < R5 / f < -1.7; the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: 23 < R6 / f < 32.
[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.9 < f4 / f < 2.1; the central thickness CT4 of the fourth lens and the distance CT34 on the optical axis between the third lens and the fourth lens satisfy: 7.9 < CT4 / CT34 < 9.5.
[0021] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 2.2; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 1.3; the image side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 38 < R10 / f < 41.
[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.5 < f6 / f < -1.3; the object side surface curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 38 < R11 / f < 41; and the image side surface curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < R12 / f < 1.
[0023] It is further preferred that the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.4; the object side surface curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.9 < R13 / f < 1; and the image side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -41 < R14 / f < -38.
[0024] It is further preferred that the effective focal length f of the optical lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1.1 < f123 / f < -1; and the effective focal length f of the optical lens and the focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.95 < f4567 / f < 1.05.
[0025] It is further preferred that the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -0.65 < f1 / f5 < -0.55; and the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: 0.8 < f1 / f6 < 0.9.
[0026] The optical lens provided by the application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as large target surface, large aperture, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS
[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:
[0028] Figure 1 FIG. 1 is a structure diagram of an optical lens according to an embodiment of the present application.
[0029] Figure 2 FIG. 3 is a field curvature curve diagram of the optical lens in the embodiment 1 of the present application.
[0030] Figure 3 FIG. 5 is an F-Tan(Theta) distortion curve diagram of the optical lens in the embodiment 1 of the present application.
[0031] Figure 4 Axial aberration curve of the optical lens in Embodiment 1 of the present application.
[0032] Figure 5 Vignetting curve of the optical lens in Embodiment 1 of the present application.
[0033] Figure 6 MTF curve of the optical lens in Embodiment 1 of the present application.
[0034] Figure 7 Structure diagram of the optical lens in Embodiment 2 of the present application.
[0035] Figure 8 Curvature of field curve of the optical lens in Embodiment 2 of the present application.
[0036] Figure 9 F-Tan(Theta) distortion curve of the optical lens in Embodiment 2 of the present application.
[0037] Figure 10 Axial aberration curve of the optical lens in Embodiment 2 of the present application.
[0038] Figure 11 Vignetting curve of the optical lens in Embodiment 2 of the present application.
[0039] Figure 12 MTF curve of the optical lens in Embodiment 2 of the present application.
[0040] Figure 13 Structure diagram of the optical lens in Embodiment 3 of the present application.
[0041] Figure 14 Curvature of field curve of the optical lens in Embodiment 3 of the present application.
[0042] Figure 15 F-Tan(Theta) distortion curve of the optical lens in Embodiment 3 of the present application.
[0043] Figure 16 Axial aberration curve of the optical lens in Embodiment 3 of the present application.
[0044] Figure 17 Vignetting curve of the optical lens in Embodiment 3 of the present application.
[0045] Figure 18 MTF curve of the optical lens in Embodiment 3 of the present application.
[0046] Figure 19 Structure diagram of the optical lens in Embodiment 4 of the present application.
[0047] Figure 20 A field curvature curve plot for the optical lens of Example 4 of the present application.
[0048] Figure 21 An F-Tan(Theta) distortion curve plot for the optical lens of Example 4 of the present application.
[0049] Figure 22 An axial aberration curve plot for the optical lens of Example 4 of the present application.
[0050] Figure 23 A sagittal color aberration curve plot for the optical lens of Example 4 of the present application.
[0051] Figure 24 An MTF curve plot for the optical lens of Example 4 of the present application.
[0052] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION
[0053] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0054] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.
[0055] In the drawings, the thickness, size, and shape of lenses have been slightly exaggerated for the sake of convenience in explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.
[0056] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.
[0057] It should also be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having" when used in this specification intends that existence of stated features, elements and / or components but does not exclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.
[0058] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0059] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0060] The optical lens provided by the embodiments of the present application comprises seven lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.
[0061] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface. The second lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The third lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface. The fourth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The fifth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The sixth lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The seventh lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface.
[0062] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the third lens and the fourth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the third lens and the fourth lens, the correction of the diaphragm aberration is facilitated.
[0063] In some embodiments, the optical lens can further include a filter and a protective glass, which are sequentially arranged along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out interference light, preventing the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass protects the optical lens, prevents the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.
[0064] In some embodiments, the fifth lens and the sixth lens can be bonded to form a bonded lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; and can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.
[0065] In some embodiments, the focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy -1.3 < f3 / f5 < -1.2, and the focal length f3 of the third lens and the focal length f7 of the seventh lens satisfy -2 < f3 / f7 < -1.8. By reasonably setting the focal length relationship of the third, fifth and seventh lenses, the light is smoothly transitioned, and various aberrations of the optical lens are corrected, thereby improving the imaging quality of the optical lens. More specifically, -1.26 < f3 / f5 < -1.21, and -1.96 < f3 / f7 < -1.85.
[0066] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 4.7 < TTL / f < 5. Satisfying the above range can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens. More specifically, 4.75 < TTL / f < 4.99.
[0067] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 4.6 < TTL / IH < 4.8. Satisfying the above range ensures that the lens has a large image surface under the condition of the same total length, which can match a large-size imaging chip to realize high-definition imaging, and better realize the balance between the small total length and the large image surface of the lens. More specifically, 4.6 < TTL / IH < 4.73.
[0068] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy 1 < IH / f < 1.1. Satisfying the above range controls the image height and focal length of the optical lens within a reasonable range, which helps the optical lens to have the characteristics of a large image surface and improves the imaging quality. More specifically, 1.02 < IH / f < 1.08.
[0069] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.3 < BFL / f < 1.4. Satisfying the above range, the optical lens is limited to have a suitable back focus, the positions of the lenses are reasonably arranged, and the processing and assembling difficulty is reduced. More specifically, 1.3 < BFL / f < 1.34.
[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.3 < f1 / f < -1.1. Satisfying the above range, by setting the first lens to have a negative refractive power, the first lens can accommodate light rays of a larger angle and collect as much light as possible into the rear optical system, thereby achieving a large field of view while increasing the light flux. More specifically, -1.27 < f1 / f < -1.19.
[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 2.6 < f2 / f < 2.9. Satisfying the above range, the second lens is limited to have a suitable positive refractive power, has the effect of converging light rays, and reduces the height of peripheral light rays, which is conducive to the reduction of the aperture of the rear lens. More specifically, 2.69 < f2 / f < 2.88.
[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -2.6 < f3 / f < -2.4; the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: -1.9 < R5 / f < -1.7; and the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 23 < R6 / f < 32. Satisfying the above range, the third lens has the effect of diverging light rays, can disperse the central light rays and the edge light rays of each field of view, can make the rear optical system have a larger light receiving surface to receive the light rays emitted from the image side surface of the third lens, thereby achieving a larger light amount and being conducive to increasing the relative luminance. More specifically, -2.59 < f3 / f < -2.49; -1.85 < R5 / f < -1.77; and 23.68 < R6 / f < 31.46.
[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.9 < f4 / f < 2.1; and the central thickness CT4 of the fourth lens and the distance CT34 between the third lens and the fourth lens on the optical axis satisfy: 7.9 < CT4 / CT34 < 9.5. Satisfying the above range, the light rays are converged, the diverging light rays smoothly enter the rear optical system, the high-quality imaging of the lens is better achieved, the distortion of the edge field of view is effectively corrected, the deformation degree of the edge of the captured image is reduced, and the image quality is improved. More specifically, 1.9 < f4 / f < 2.05; and 7.95 < CT4 / CT34 < 8.96.
[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 2.2; the object-side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 1.3; the image-side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 38 < R10 / f < 41; the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: -1.1 < (R9+R10) / (R9-R10) < -1. The above ranges are satisfied, the fifth lens is limited to have appropriate positive refractive power and suitable surface shape, which is beneficial to light convergence. The fifth lens with positive refractive power and the sixth lens with negative refractive power are matched, which can adjust the optical path difference between different fields of view, improve resolution, and is beneficial to make light enter the rear lens gently, which can further reduce field curvature and correct off-axis point aberration of the optical lens. More specifically, 2.02 < f5 / f < 2.11; 1.17 < R9 / f < 1.22; 38.59 < R10 / f < 40.05; -1.07 < (R9+R10) / (R9-R10) < -1.05.
[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.5 < f6 / f < -1.3; the object-side surface curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 38 < R11 / f < 41; the image-side surface curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < R12 / f < 1. The above ranges are satisfied, the sixth lens is limited to have appropriate negative refractive power, which can diverge the light emitted by the fifth lens, make the light of the edge field have an upward trend, and is beneficial to make the image point on the imaging surface away from the optical axis, so as to realize the effect of matching with a large chip, obtain a larger picture, effectively eliminate aberration, and improve the resolving power of the optical lens. More specifically, -1.45 < f6 / f < -1.35; 38.59 < R11 / f < 40.05; 0.91 < R12 / f < 0.99.
[0076] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.4; the object-side surface curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.9 < R13 / f < 1; the image-side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -41 < R14 / f < -38; and the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: -1 < (R13+R14) / (R13-R14) < -0.9. Satisfying the above ranges, the seventh lens is limited to have positive refractive power and suitable surface shape, which is beneficial to light convergence, smooth transition of light trend to the rear, reduction of the height of light incident to the rear, slowing down of the upward trend of light, avoidance of light energy loss caused by too large angle between the main light ray and the chip when the large field of view light reaches the imaging surface, improvement of the illumination of the edge field of view, and realization of short optical total length. More specifically, 1.29 < f7 / f < 1.38; 0.91 < R13 / f < 0.98; -40.05 < R14 / f < -38.59; and -0.96 < (R13+R14) / (R13-R14) < -0.94.
[0077] In some embodiments, the effective focal length f of the optical lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1.1 < f123 / f < -1; and the effective focal length f of the optical lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.95 < f4567 / f < 1.05. Satisfying the above ranges, by reasonably setting the focal lengths of the lens groups before and after the stop, it is beneficial to balance various aberrations of the system and improve the overall imaging quality. More specifically, -1.05 < f123 / f < -1; and 0.98 < f4567 / f < 1.03.
[0078] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -0.65 < f1 / f5 < -0.55; and the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: 0.8 < f1 / f6 < 0.9. Satisfying the above ranges, by reasonably setting the focal length relationship of the first, fifth and sixth lenses, it is beneficial to smooth transition of light, correction of various aberrations of the optical lens and improvement of the imaging quality of the optical lens. More specifically, -0.61 < f1 / f5 < -0.58; and 0.84 < f1 / f6 < 0.89.
[0079] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.8 < IH / EPD < 2. Satisfying the above range is beneficial to increase the light amount and make the peripheral field of view and the central field of view more uniform in brightness. More specifically, 1.85 < IH / EPD < 1.94.
[0080] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens along the optical axis, ∑CT, and the total track length of the optical lens, TTL, satisfy: 0.63 < ∑CT / TTL < 0.67. Satisfying the above range, the total track length of the optical lens and the sum of the thicknesses of the lenses are reasonably configured, which helps to achieve high pixel characteristics and improve the imaging quality of the optical lens.
[0081] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens along the optical axis, ∑CT, and the effective focal length of the optical lens, f, satisfy: 3.04 < ∑CT / f < 3.28. Satisfying the above range, the field curvature and distortion of the optical lens can be effectively corrected, and the imaging quality of the optical lens is improved.
[0082] In some embodiments, the optical lens satisfies the following conditional expressions: 7.4 mm < f < 7.8 mm; 4.1 mm < EPD < 4.3 mm; 36 mm < TTL < 38 mm; 1.7 < Fno < 1.9; 13° < CRA < 14°; 9 mm < BFL < 11 mm; 60° < FOV < 70°; 7.5 mm < IH < 8.5 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total track length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above range, the optical lens has one or more advantages such as large target surface, large aperture, long focal length characteristics, and the like. More specifically, 7.48 mm < f < 7.78 mm; 4.14 mm < EPD < 4.3 mm; 36.83 mm < TTL < 37.57 mm; 1.79 < Fno < 1.83; 13.43° < CRA < 13.78°; 9.9 mm < BFL < 10.23 mm; 62° < FOV < 67°; 7.95 mm < IH < 8.01 mm.
[0083] In some embodiments, the material of the lenses in the optical lens provided by the present application can be glass or plastic. When the material of the lenses is plastic, the production cost can be effectively reduced. When the material of the lenses is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristics of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.
[0084] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens of the present application adopt a spherical lens, and the seventh lens adopts an aspherical lens.
[0085] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:
[0086]
[0087] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.
[0088] The present application is further described in the following embodiments. In various embodiments, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement modes, and are included in the protection scope of the present application.
[0089] Embodiment 1
[0090] Please refer to Figure 1 , which is a structural schematic diagram of an optical lens 100 provided in Embodiment 1 of the present application. The optical lens 100 includes, in order from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.
[0091] The first lens L1 has a negative focal power, the object side surface S1 thereof is a concave surface, and the image side surface S2 thereof is a concave surface.
[0092] The second lens L2 has a positive focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface.
[0093] The third lens L3 has a negative focal power, the object side surface S5 thereof is a concave surface, and the image side surface S6 thereof is a concave surface.
[0094] The fourth lens L4 has positive focal power, the object side S7 is a convex surface, and the image side S8 is a convex surface;
[0095] The fifth lens L5 has positive focal power, the object side S9 is a convex surface, and the image side is a concave surface;
[0096] The sixth lens L6 has negative focal power, the object side is a convex surface, and the image side S11 is a concave surface;
[0097] The fifth lens L5 and the sixth lens L6 form a cemented lens group with negative focal power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;
[0098] The seventh lens L7 has positive focal power, the object side S12 is a convex surface, and the image side S13 is a convex surface;
[0099] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;
[0100] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;
[0101] The imaging surface S18 is a flat surface.
[0102] The seventh lens L7 is a glass aspheric lens, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses.
[0103] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.
[0104] Table 1-1
[0105]
[0106] The surface type parameters of the aspheric lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.
[0107] Table 1-2
[0108] Face number K B C D E F S12 -3.94E+00 1.14E-03 -2.61E-05 1.09E-06 -3.30E-08 5.07E-10 S13 -9.74E+01 3.92E-04 1.61E-06 3.01E-07 -1.89E-08 4.76E-10
[0109] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve, the off-axis chromatic aberration curve, and the MTF curve of the optical lens 100 are shown in Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6
[0110] Figure 2 The field curvature curve of embodiment 1 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.01mm~0.04mm, which shows that the optical lens 100 can correct the field curvature well.
[0111] Figure 3 The F-Tan(Theta) distortion curve of embodiment 1 is shown, which represents the distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within-20%~0, which shows that the optical lens 100 can correct the distortion well.
[0112] Figure 4 The axial aberration curve of embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-0.01mm~0.04mm, which shows that the optical lens 100 can correct the axial aberration well.
[0113] Figure 5 The axial aberration curve of embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-0.01mm~0.04mm, which shows that the optical lens 100 can correct the axial aberration well.
[0114] Figure 6 The MTF(modulation transfer function) curve of embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0~160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.
[0115] Embodiment 2
[0116] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in embodiment 2 of the present application, and the main difference between the present embodiment and embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.
[0117] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.
[0118] Table 2-1
[0119]
[0120]
[0121] The surface type parameters of the aspherical lenses of the optical lens 200 in Embodiment 2 are shown in Table 2-2.
[0122] Table 2-2
[0123] Face number K B C D E F S12 -3.85E+00 1.16E-03 -2.56E-05 1.10E-06 -3.33E-08 5.28E-10 S13 -2.00E+02 4.08E-04 1.94E-06 3.08E-07 -1.83E-08 4.98E-10
[0124] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF curve of the optical lens 200 are shown in Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 respectively.
[0125] It can be seen from Figure 8 that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.01mm-0.04mm, which shows that the optical lens 200 can well correct the field curvature.
[0126] It can be seen from Figure 9 that the distortion of the optical lens is controlled within -20%-0, which shows that the optical lens 200 can well correct the distortion.
[0127] It can be seen from Figure 10 that the shift of the axial aberration is controlled within -0.01mm-0.04mm, which shows that the optical lens 200 can well correct the axial aberration.
[0128] It can be seen from Figure 11 that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1um-4um, which shows that the optical lens 200 can well correct the chromatic aberration.
[0129] It can be seen from Figure 12 that the MTF value of this embodiment is above 0.4 in the full field of view, and in the range of 0-160lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.
[0130] Embodiment 3
[0131] Referring to Figure 13 , a structural diagram of the optical lens 300 provided in Embodiment 3 of the present application is shown, and the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.
[0132] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.
[0133] Table 3-1
[0134]
[0135]
[0136] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.
[0137] Table 3-2
[0138] Face number K B C D E F S12 -3.85E+00 1.20E-03 -2.67E-05 1.11E-06 -3.28E-08 4.90E-10 S13 -1.99E+02 4.00E-04 3.72E-07 3.59E-07 -1.78E-08 3.59E-10
[0139] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF curve of the optical lens 300 are shown in Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 respectively.
[0140] As can be seen from Figure 14 , the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.01mm-0.04mm, which shows that the optical lens 300 can correct the field curvature well.
[0141] As can be seen from Figure 15 , the distortion of the optical lens is controlled within -20%-0, which shows that the optical lens 300 can correct the distortion well.
[0142] As can be seen from Figure 16 , the shift of the axial aberration is controlled within -0.01mm-0.04mm, which shows that the optical lens 300 can correct the axial aberration well.
[0143] As can be seen from Figure 17 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm-3μm, which shows that the optical lens 300 can correct the chromatic aberration well.
[0144] As can be seen from Figure 18It can be seen from the MTF curves in FIG. 6 that the MTF values of the optical lens 400 in the embodiment are all above 0.4 in the full field of view, and the MTF curves are uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-160 lp / mm, and the optical lens 400 has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.
[0145] Embodiment 4
[0146] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference between the two embodiments is that the optical parameters such as the radii of curvature of the surfaces of the lenses and the thicknesses of the lenses are different.
[0147] The related parameters of the lenses in the optical lens 400 in Embodiment 4 are shown in Table 4-1.
[0148] Table 4-1
[0149]
[0150] The surface type parameters of the aspherical lenses of the optical lens 400 in Embodiment 4 are shown in Table 4-2.
[0151] Table 4-2
[0152] Face number K B C D E F S12 -3.74E+00 1.16E-03 -2.52E-05 1.09E-06 -3.24E-08 5.23E-10 S13 -1.42E+02 4.11E-04 2.35E-06 3.17E-07 -1.79E-08 5.65E-10
[0153] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF curve of the optical lens 400 are shown in Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 respectively.
[0154] It can be seen from Figure 20 that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.02 mm-0.04 mm, which indicates that the optical lens 400 can well correct the field curvature.
[0155] It can be seen from Figure 21 that the distortion of the optical lens is controlled within -20%-0, which indicates that the optical lens 400 can well correct the distortion.
[0156] It can be seen from Figure 22 that the shift of the axial aberration is controlled within -0.01 mm-0.04 mm, which indicates that the optical lens 400 can well correct the axial aberration.
[0157] It can be seen from Figure 23As can be seen from the above table, the maximum and minimum axial chromatic aberration is controlled within -1 μm~4 μm, which indicates that the optical lens 400 can correct chromatic aberration very well.
[0158] From Figure 24 As can be seen from the above table, the MTF value of the embodiment is above 0.4 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0~160 lp / mm, and has good imaging quality and good detail resolution in the case of low frequency and high frequency.
[0159] Please refer to Table 5, the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.
[0160] Table 5
[0161]
[0162]
[0163] In summary of the above embodiments, the optical lens provided by the present application adopts seven lenses with specific optical power, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as large target surface, large aperture, high imaging quality, etc.
[0164] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0165] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. An optical lens comprising seven lenses, characterized in that, It successively includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side is concave and whose image side is concave; A second lens with a positive optical power, whose object side is convex and whose image side is concave; A third lens with a negative optical power, whose object side is concave and whose image side is concave; A fourth lens with a positive optical power, whose object side is convex and whose image side is convex; A fifth lens with a positive optical power, whose object side is convex and whose image side is concave; A sixth lens with a negative optical power, whose object side is convex and whose image side is concave; A seventh lens with a positive optical power, whose object side is convex and whose image side is convex; Wherein, the focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy: -1.3 < f3 / f5 < -1.2; The focal length f3 of the third lens and the focal length f7 of the seventh lens satisfy: -2 < f3 / f7 < -1.
8.
2. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.7 < TTL / f < 5; The overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 4.6 < TTL / IH < 4.
8.
3. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1 < IH / f < 1.1; The effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.3 < BFL / f < 1.
4.
4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.3 < f1 / f < -1.1; The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 2.6 < f2 / f < 2.
9.
5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -2.6 < f3 / f < -2.4; The object side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.9 < R5 / f < -1.7; The image side curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: 23 < R6 / f < 32.
6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.9 < f4 / f < 2.1; The central thickness CT4 of the fourth lens and the spacing CT34 between the third lens and the fourth lens on the optical axis satisfy: 7.9 < CT4 / CT34 < 9.
5.
7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 2.2; The object side curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 1.3; The image side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 38 < R10 / f < 41.
8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.5 < f6 / f < -1.3; the curvature radius R11 of the object side of the sixth lens and the effective focal length f of the optical lens satisfy: 38 < R11 / f < 41; the curvature radius R12 of the image side of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < R12 / f < 1.
9. The optical lens according to claim 1, characterized in that, The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.4; the curvature radius R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.9 < R13 / f < 1; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: -41 < R14 / f < -38.
10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1.1 < f123 / f < -1; the effective focal length f of the optical lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.95 < f4567 / f < 1.
05.
11. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -0.65 < f1 / f5 < -0.55; the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: 0.8 < f1 / f6 < 0.9.
Citation Information
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Camera shooting optical lens
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Optical lens, camera module, electronic device and vehicle
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