Optical lens
By designing a specific optical power and surface shape for six lenses, the imaging problem of automotive optical lenses under low-light conditions was solved, achieving high-definition imaging and miniaturization, while reducing aberrations and distortion.
Patent Information
- Application Number
- CN202510827578.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2045-06-20
AI Technical Summary
Existing automotive optical lenses perform poorly in low-light conditions, failing to meet the demands of high-definition imaging, and their design suffers from aberrations and distortion.
Employing a six-lens structure with a specific combination of optical power and surface shape, including a first lens with negative optical power and second to sixth lenses with positive optical power, the imaging quality of the optical lens is optimized through reasonable optical power allocation and surface design.
It achieves high-definition imaging under low-light conditions, reduces aberrations and distortions, and has advantages such as miniaturization, large target surface, large aperture, and large field of view, thus improving imaging quality.
Smart Images
Figure CN120507860B_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 the position of vehicle optical lenses in the automobile industry is continuously improved.
[0003] Electronic rearview mirror is an indirect vision device that acquires a specified field of view through a camera and a monitor system. It contains high-definition cameras, digital vision processing systems, safety systems, liquid crystal displays, and other electronic devices, and is a new type of rearview mirror that can replace traditional rearview mirrors. Electronic rearview mirrors are generally designed with a main lens and a wide-angle lens, which present images through a display screen, can provide a wider field of view, eliminate blind spots, help drivers better understand the surrounding environment, and reduce accidents. The lenses of existing electronic rearview mirrors require not only thin and small shapes and high pixel and high resolution characteristics, but also clear imaging under low illumination conditions, so an optical lens with good imaging effect needs to be developed. SUMMARY
[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with excellent imaging quality.
[0005] The technical scheme adopted by the present application is:
[0006] An optical lens, a total of six lenses, including in order along the optical axis from the object side to the imaging surface:
[0007] The first lens has negative focal power, the object side surface is concave, and the image side surface is concave;
[0008] The second lens has positive focal power;
[0009] The third lens has positive focal power, and the object side surface is convex;
[0010] The fourth lens has positive focal power, the object side surface is concave, and the image side surface is convex;
[0011] The fifth lens has negative focal power, the object side surface is convex, and the image side surface is concave;
[0012] The sixth lens has positive focal power;
[0013] Wherein, the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 0.2<(R9-R10) / (R9+R10)<0.9.
[0014] Further preferably, the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.4 < TTL / f < 2.9; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.8 < TTL / IH < 2.3.
[0015] Further preferably, the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.7 < IH / EPD < 2.7; the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < IH / f < 1.5.
[0016] Further preferably, the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 1.07 < d1 / (IH / 2) / tan(FOV / 2) < 1.81; the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 1.07 < d1 / (IH / 2) / tan(FOV / 2) < 1.81; the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 1.07 < d1 / (IH / 2) / tan(FOV / 2) < 1.81.
[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5 < f1 / f < -0.9; the effective focal length f of the optical lens and the curvature radius R1 of the object side surface of the first lens satisfy: -9 < R1 / f < -1.2; the effective focal length f of the optical lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.6 < R2 / f < 5.9.
[0018] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.7 < f2 / f < 9; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 17.
[0019] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8 < f4 / f < 25; the effective focal length f of the optical lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: -14.5 < R7 / f < -0.5; the effective focal length f of the optical lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1.3 < R8 / f < -0.4.
[0020] It is further preferred that the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.3 < f5 / f < -0.8; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.4 < R9 / f < 9; the image side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.2 < R10 / f < 0.7.
[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2 < f6 / f < 24; the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.6 < f5 / f6 < 0.
[0022] It is further preferred that the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: -0.1 < (R7-R8) / (R7+R8) < 1; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.6 < (R1+R2) / (R1-R2) < 0.9.
[0023] The optical lens provided by the application adopts six lenses with specific focal lengths, and through specific surface shape matching and reasonable focal length distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of miniaturization, large target surface, large aperture, large field of view, high imaging quality, etc. BRIEF DESCRIPTION OF DRAWINGS
[0024] The above and / or additional aspects and advantages of the application will become apparent and be readily understood from the following description, taken in connection with the accompanying drawings, in which:
[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the application.
[0026] Figure 2 FIG. 2 is an F-Tan(Theta) distortion curve diagram of the optical lens according to the embodiment 1 of the application.
[0027] Figure 3 FIG. 3 is an MTF curve diagram of the optical lens according to the embodiment 1 of the application.
[0028] Figure 4 FIG. 4 is a structural schematic diagram of an optical lens according to another embodiment of the application.
[0029] Figure 5 FIG. 5 is an F-Tan(Theta) distortion curve diagram of the optical lens according to the embodiment 2 of the application.
[0030] Figure 6MTF curve of the optical lens in embodiment 2 of the present application.
[0031] Figure 7 Structure diagram of the optical lens in embodiment 3 of the present application.
[0032] Figure 8 F-Tan(Theta) distortion curve of the optical lens in embodiment 3 of the present application.
[0033] Figure 9 MTF curve of the optical lens in embodiment 3 of the present application.
[0034] Figure 10 Structure diagram of the optical lens in embodiment 4 of the present application.
[0035] Figure 11 F-Tan(Theta) distortion curve of the optical lens in embodiment 4 of the present application.
[0036] Figure 12 MTF curve of the optical lens in embodiment 4 of the present application.
[0037] Figure 13 Structure diagram of the optical lens in embodiment 5 of the present application.
[0038] Figure 14 F-Tan(Theta) distortion curve of the optical lens in embodiment 5 of the present application.
[0039] Figure 15 MTF curve of the optical lens in embodiment 5 of the present application.
[0040] Figure 16 Structure diagram of the optical lens in embodiment 6 of the present application.
[0041] Figure 17 F-Tan(Theta) distortion curve of the optical lens in embodiment 6 of the present application.
[0042] Figure 18 MTF curve of the optical lens in embodiment 6 of the present application.
[0043] Figure 19 Structure diagram of the optical lens in embodiment 7 of the present application.
[0044] Figure 20 F-Tan(Theta) distortion curve of the optical lens in embodiment 7 of the present application.
[0045] Figure 21 MTF curve of the optical lens in embodiment 7 of the present application.
[0046] The following detailed description will further explain the present application with reference to the accompanying drawings. DETAILED DESCRIPTION
[0047] For a better understanding of the present application, various aspects of the present application will be described in relation to the annexed drawings. It is stressed that these descriptions are only examples of embodiments of the present application, and are not meant in any way to restrict the scope of the application. Throughout the description, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0048] It is to be noted that the expressions first, second, third, etc. are used in this specification only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first lens discussed below can also be referred to as a second lens or a third lens, without departing from the teachings of the present application.
[0049] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.
[0050] In this context, 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.
[0051] It is also to be understood that the use of the terms "including", "comprising", "having" and / or "containing" when used in this specification, particularly in the claims, means that existence of stated features, elements and / or components are present, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations 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 use of the term "exemplary" is intended to present an example or an illustration. It is further to be understood that the use of relational terms such as "first", "second", and the like, if any, are used solely to distinguish one from another entity or action without necessarily implying a relationship or order between the entities or actions.
[0052] 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 will be further understood that terms, such as those defined in commonly used dictionaries, 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.
[0053] 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.
[0054] The optical lens provided by the embodiment of the present application comprises six 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 and the sixth lens.
[0055] 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 can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The third lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fourth lens can have a positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The fifth 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 sixth lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface.
[0056] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the third lens and the fourth lens or between the second lens and the third 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 or between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.
[0057] In some embodiments, the optical lens can further comprise a filter, which is arranged between the sixth lens and the imaging surface. The filter is used to filter out the interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging.
[0058] In some embodiments, the fifth lens satisfies: 0.2 < (R9-R10) / (R9+R10) < 0.9. Satisfying the above range, the fifth lens is defined to have a suitable surface shape, so that the light rays of the edge field have an upward trend, and the image points on the imaging surface are away from the optical axis, so as to facilitate the realization of the effect of matching the large chip, obtain a larger picture, effectively eliminate aberration, and improve the resolving power of the optical lens. More specifically, 0.27 < (R9-R10) / (R9+R10) < 0.88.
[0059] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.4 < TTL / f < 2.9. Satisfying the above range can effectively limit the length of the lens, and facilitate the miniaturization of the optical lens. More specifically, 2.51 < TTL / f < 2.88.
[0060] In some embodiments, the optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.8 < TTL / IH < 2.3. Satisfying the above range ensures that the lens has a larger image surface under the condition of the same total length, and can match a larger 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, 1.96 < TTL / IH < 2.28.
[0061] 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: 1.7 < IH / EPD < 2.7. Satisfying the above range is beneficial to increase the light quantity, so that the peripheral field and the central field have more uniform brightness. More specifically, 1.79 < IH / EPD < 2.59.
[0062] 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: 1.1 < IH / f < 1.5. Satisfying the above range controls the image height and the focal length of the optical lens within a reasonable range, which is helpful for the optical lens to have the characteristic of large image surface and improve the imaging quality. More specifically, 1.12 < IH / f < 1.38.
[0063] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 1.07 < d1 / (IH / 2) / tan(FOV / 2) < 1.81. Satisfying the above range can satisfy the optical lens to have a large field angle and a large image surface while having a small front aperture.
[0064] In some embodiments, the first lens satisfies: 0.88 < d1 / d12 < 1.45, where d1 is the half entrance pupil diameter of the object side surface of the first lens, and d12 is the half entrance pupil diameter of the image side surface of the sixth lens. The above range and the reasonable matching of the aperture ratio of the first lens and the sixth lens facilitate the structural design and help improve the imaging quality of the optical lens.
[0065] In some embodiments, the optical lens satisfies: -2.5 < f1 / f < -0.9, where f1 is the focal length of the first lens, and f is the effective focal length of the optical lens; -9 < R1 / f < -1.2, where R1 is the curvature radius of the object side surface of the first lens, and f is the effective focal length of the optical lens; 0.6 < R2 / f < 5.9, where R2 is the curvature radius of the image side surface of the first lens, and f is the effective focal length of the optical lens; and -0.6 < (R1+R2) / (R1-R2) < 0.9, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and f is the effective focal length of the optical lens. The above ranges and the setting of the first lens with negative refractive power and appropriate surface shape help the first lens accommodate light rays with 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, -2.29 < f1 / f < -0.98; -8.62 < R1 / f < -1.29; 0.66 < R2 / f < 5.41; and -0.56 < (R1+R2) / (R1-R2) < 0.86.
[0066] In some embodiments, the optical lens satisfies: 0.7 < f2 / f < 9, where f2 is the focal length of the second lens, and f is the effective focal length of the optical lens. The above range limits the second lens to have appropriate positive refractive power, has the effect of converging light rays, makes the divergent light rays smoothly enter the rear optical system, and reduces the height of the peripheral light rays, which is conducive to the reduction of the aperture of the rear lens. More specifically, 0.8 < f2 / f < 8.7.
[0067] In some embodiments, the optical lens satisfies: 0.8 < f3 / f < 17, where f3 is the focal length of the third lens, and f is the effective focal length of the optical lens. The above range limits the third lens to have appropriate positive refractive power, which is conducive to the convergence of light rays and can effectively correct the distortion of the edge field of view, reduce the deformation degree of the edge of the captured image, and improve the image quality. More specifically, 0.83 < f3 / f < 16.2.
[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8 < f4 / f < 25; the object-side surface curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: -14.5 < R7 / f < -0.5; the image-side surface curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < R8 / f < -0.4; the object-side surface curvature radius R7 of the fourth lens and the image-side surface curvature radius R8 of the fourth lens satisfy: -0.1 < (R7-R8) / (R7+R8) < 1. Satisfying the above ranges is conducive to the convergence of light rays, shares the positive refractive power of the second lens and the third lens, can avoid excessive deflection of light rays, and better achieve high-quality imaging of the lens. More specifically, 0.81 < f4 / f < 23.27; -13.16 < R7 / f < -0.56; -1.18 < R8 / f < -0.4; -0.03 < (R7-R8) / (R7+R8) < 0.93.
[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.3 < f5 / f < -0.8; the object-side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.4 < R9 / f < 9; the image-side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.2 < R10 / f < 0.7. Satisfying the above ranges causes the light rays at the edge field of view to have an upward trend, which is conducive to the image points on the imaging surface being away from the optical axis, so as to facilitate the realization of the effect of matching a large chip, obtain a larger picture, effectively eliminate aberration, and improve the resolving power of the optical lens. More specifically, -1.24 < f5 / f < -0.9; 0.46 < R9 / f < 8.28; 0.24 < R10 / f < 0.65.
[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2 < f6 / f < 24. Satisfying the above ranges limits the sixth lens to have positive refractive power, which is conducive to the convergence of light rays, causes the light rays to have a smooth transition to the rear, reduces the height of the light rays incident to the rear, slows down the upward trend of the light rays, avoids the loss of light energy caused by the excessively large chief ray angle of the large field of view light rays reaching the imaging surface, is conducive to improving the illumination of the edge field of view, and is conducive to realizing a short total optical length. More specifically, 2.06 < f6 / f < 22.05.
[0071] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.6 < f5 / f6 < 0. Satisfying the above ranges reasonably sets the focal length relationship of the fifth lens and the sixth lens, which can avoid excessive deflection of light rays and reduce the difficulty of aberration correction. More specifically, -0.57 < f5 / f6 < -0.04.
[0072] In some embodiments, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.76 < (IH / 2) / (f x Tan(FOV / 2)) < 0.96. Satisfying the above range, the distortion of the optical lens is controlled within a reasonable range.
[0073] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 42°. Satisfying the above range, the optical lens is limited to have a suitable field angle and aperture value, capable of collecting light rays of a large angle and obtaining good imaging quality. More specifically, 36.2° < FOV / Fno < 40.01°.
[0074] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 1.06. Satisfying the above range, the optical lens is limited to have a suitable back focus, facilitating reasonable arrangement of the positions of the lenses, while reducing the difficulty of processing and assembly.
[0075] In some embodiments, the total length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first to sixth lenses along the optical axis respectively satisfy: 0.46 < ∑CT / TTL < 0.84. Satisfying the above range, the total 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.
[0076] In some embodiments, the sum ∑CT of the central thicknesses of the first to sixth lenses along the optical axis and the effective focal length f of the optical lens satisfy: 1.34 < ∑CT / f < 2.14. 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.
[0077] In some embodiments, the optical lens satisfies the following conditional expressions: 4mm < f < 5.2mm; 2.1mm < EPD < 3.3mm; 11mm < TTL < 14mm; 1.5 < Fno < 2.1; 22° < CRA < 34°; 0.9mm < BFL < 4.5mm; 60° < FOV < 85°; 5.5mm < IH < 6mm. 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. The optical lens satisfies the above ranges and has one or more advantages such as miniaturization, large target surface, large aperture, large field of view angle, and the like. More specifically, 4.18mm < f < 5.08mm; 2.2mm < EPD < 3.18mm; 11.24mm < TTL < 13.01mm; 1.59 < Fno < 2.01; 22.97° < CRA < 33.17°; 0.97mm < BFL < 4.42mm; 61° < FOV < 81°; 5.69mm < IH < 5.73mm.
[0078] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected due to the low dispersion characteristic of the glass itself. In the optical lens provided by the present application, the first lens is a glass lens, the fourth lens, the fifth lens, and the sixth lens are plastic lenses, the second lens and the third lens are glass or plastic lenses, and the glass-plastic hybrid structure is adopted, so that the cost can be effectively reduced, the aberration can be corrected, the size can be reduced, and an optical lens product with higher performance-price ratio can be provided.
[0079] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can be a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first lens of the present application is a spherical lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lenses, and the second lens and the third lens are spherical or aspherical lenses.
[0080] In various embodiments of the present application, when the lens is an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:
[0081]
[0082] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and B, C, D, E, and F are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order curved surfaces, respectively.
[0083] The application will be further described in the following embodiments. In each embodiment, 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 merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.
[0084] Embodiment 1
[0085] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application. The optical lens 100 includes, in sequence 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 stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
[0086] 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.
[0087] The second lens L2 has a positive focal power, the object side surface S3 thereof is a convex surface at the vicinity of the optical axis, and the image side surface S4 thereof is a concave surface.
[0088] The third lens L3 has a positive focal power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a convex surface.
[0089] The fourth lens L4 has a positive focal power, the object side surface S7 thereof is a concave surface, and the image side surface S8 thereof is a convex surface.
[0090] The fifth lens L5 has a negative focal power, the object side surface S9 thereof is a convex surface, and the image side surface S10 thereof is a concave surface.
[0091] The sixth lens L6 has a positive focal power, the object side surface S11 thereof is a convex surface, and the image side surface S12 thereof is a convex surface at the vicinity of the optical axis.
[0092] The object side surface S13 and the image side surface S14 of the filter G1 are both flat surfaces.
[0093] The imaging surface S15 is a flat surface.
[0094] The first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
[0095] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.
[0096] Table 1-1
[0097]
[0098] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.
[0099] Table 1-2
[0100]
[0101]
[0102] In this embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 100 are shown in Figure 2 , Figure 3 respectively.
[0103] Figure 2 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 plane, 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 -8%~0, which shows that the optical lens 100 can well correct the distortion.
[0104] Figure 3 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 this embodiment is above 0.5 within the full field of view, and in the range of 0~120 lp / 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.
[0105] Embodiment 2
[0106] Please refer to Figure 4 , which is a structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the image side surface S6 of the third lens L3 is a concave surface, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.
[0107] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.
[0108] Table 2-1
[0109]
[0110]
[0111] The surface shape parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.
[0112] Table 2-2
[0113] Figure 5 K B C D E F S3 7.66E+00 1.67E-03 -4.94E-04 5.16E-04 5.22E-05 -4.04E-05 S4 9.04E-01 1.15E-02 -3.77E-04 1.22E-03 1.39E-05 -2.62E-05 S7 -1.00E+02 6.53E-03 -2.90E-03 7.24E-04 2.83E-05 -2.33E-05 S8 -3.41E+00 -7.22E-03 -1.57E-03 2.31E-04 5.91E-06 -5.15E-06 S9 -6.75E+00 -1.12E-02 -1.01E-03 2.19E-04 1.43E-04 -3.34E-05 S10 -3.13E+00 -2.71E-03 1.11E-03 2.91E-04 -3.39E-05 -1.43E-05 S11 3.13E+01 2.68E-02 1.36E-03 -3.40E-04 -2.81E-05 4.55E-06 S12 -1.15E+01 1.42E-02 2.21E-03 -1.33E-04 -5.94E-06 5.96E-06
[0114] In the present embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 200 are shown in Figure 6 , Figure 5 respectively.
[0115] As can be seen from Figure 6 , the distortion of the optical lens is controlled within -8%~0, which indicates that the optical lens 200 can well correct the distortion.
[0116] As can be seen from Figure 7 , the MTF value of the present embodiment is above 0.48 in the full field of view, and in the range of 0~120 lp / 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.
[0117] Embodiment 3
[0118] Please refer to Figure 8 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that: the object side S3 of the second lens L2 is a concave surface; the image side S4 of the second lens L2 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.
[0119] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.
[0120] Table 3-1
[0121]
[0122]
[0123] The surface shape parameters of the aspheric lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.
[0124] Table 3-2
[0125] Figure 9 K B C D E F S3 -1.00E+02 8.39E-03 1.57E-03 -2.22E-04 2.53E-05 -2.95E-06 S4 4.43E+01 1.79E-02 1.39E-03 6.67E-04 -6.84E-05 8.81E-06 S7 -5.49E+01 2.10E-02 3.21E-03 -1.05E-03 8.69E-05 2.23E-05 S8 -2.54E+00 5.52E-03 2.36E-03 -1.99E-05 -3.86E-04 8.95E-05 S9 -1.00E+02 -5.09E-02 5.29E-03 -1.28E-03 1.48E-04 7.10E-06 S10 -5.43E+00 -1.35E-03 7.93E-04 1.09E-03 -1.84E-04 3.66E-07 S11 -1.18E-01 -5.05E-03 1.63E-03 -2.51E-04 2.43E-05 -1.05E-06 S12 -1.12E+01 -8.33E-03 -3.57E-04 7.14E-05 2.56E-06 -4.49E-07
[0126] In this embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 300 are shown in Figure 8 , Figure 9 respectively.
[0127] As can be seen from Figure 10 , the distortion of the optical lens is controlled within -8%~0, which indicates that the optical lens 300 can correct the distortion well.
[0128] As can be seen from Figure 11 , the MTF value of this embodiment is above 0.5 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 0~120 lp / mm, which has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.
[0129] Embodiment 4
[0130] Please refer to Figure 12 , 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 is that the object side S3 of the second lens L2 is a concave surface; the image side S4 of the second lens L2 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.
[0131] The related parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.
[0132] Table 4-1
[0133]
[0134] The surface shape parameters of the aspheric lenses of the optical lens 400 in Embodiment 4 are shown in Table 4-2.
[0135] Table 4-2
[0136] Figure 11 K B C D E F S3 -1.00E+02 -9.79E-03 -9.46E-07 4.67E-04 -2.11E-05 -7.04E-06 S4 -8.39E-01 -1.76E-03 -3.64E-04 5.99E-04 -6.86E-05 -9.64E-07 S7 -6.65E+00 2.09E-02 -4.97E-04 -9.79E-04 3.83E-04 -4.86E-05 S8 -4.30E+00 3.02E-02 -1.03E-02 1.90E-03 6.28E-05 -4.62E-05 S9 -4.13E+01 -3.28E-02 -1.97E-03 2.29E-03 3.39E-04 -1.46E-04 S10 -7.18E+00 -1.63E-02 7.75E-03 -7.82E-04 5.67E-04 -1.41E-04 S11 -1.00E+02 3.25E-02 5.83E-03 1.01E-04 -6.17E-04 8.75E-05 S12 2.10E+00 2.84E-02 1.62E-03 2.92E-03 -9.15E-04 1.19E-04
[0137] In this embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 400 are shown in Figure 12 , Figure 13 respectively.
[0138] As can be seen fromFigure 14 As can be seen, the distortion of the optical lens is controlled within -8% to 0, indicating that the optical lens 400 can effectively correct distortion.
[0139] from Figure 15 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.
[0140] Example 5
[0141] Please see Figure 14 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.
[0142] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.
[0143] Table 5-1
[0144]
[0145] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.
[0146] Table 5-2
[0147] Figure 15 K B C D E F S5 -3.83E-01 -9.73E-04 2.17E-04 -1.23E-04 -1.38E-05 -2.29E-06 S6 -5.08E+00 -3.54E-03 -4.64E-04 -8.44E-05 -4.93E-06 2.62E-06 S7 -4.15E+00 4.76E-04 6.08E-04 -2.49E-06 -2.03E-05 8.16E-06 S8 -2.58E+01 5.11E-03 1.85E-04 1.73E-04 8.54E-05 -1.77E-05 S9 -7.78E+01 -9.33E-03 -5.61E-03 2.75E-04 2.46E-04 -7.32E-05 S10 -4.96E-01 -1.96E-02 7.10E-05 2.36E-04 -3.64E-05 2.80E-06 S11 -1.00E+02 8.51E-03 7.29E-05 -1.13E-04 3.15E-05 -4.44E-06 S12 1.00E+02 8.84E-03 -2.78E-03 3.23E-04 8.09E-06 -3.78E-06
[0148] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 500 are shown as follows: Figure 16 , Figure 17 As shown.
[0149] from Figure 18 As can be seen, the distortion of the optical lens is controlled within -8% to 0, indicating that the optical lens 500 can effectively correct distortion.
[0150] from Figure 17 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.
[0151] Example 6
[0152] Please see Figure 18 The diagram shows a schematic of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image-side surface S4 of the second lens L2 is convex; the image-side surface S6 of the third lens L3 is concave; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.
[0153] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.
[0154] Table 6-1
[0155]
[0156] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.
[0157] Table 6-2
[0158]
[0159]
[0160] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 600 are respectively as follows: Figure 19 , Figure 20 As shown.
[0161] from Figure 21 As can be seen, the distortion of the optical lens is controlled within -15% to 0, indicating that the optical lens 600 can effectively correct distortion.
[0162] from Figure 20 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.
[0163] Example 7
[0164] Please see Figure 21Figure 7 shows a structural schematic diagram of the optical lens 700 provided in Embodiment 7 of the present application. Compared with Embodiment 1, the main difference is that the diaphragm ST is arranged between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image side S4 of the second lens L2 is a convex surface; the image side S6 of the third lens L3 is a concave surface; the image side S12 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.
[0165] The related parameters of each lens in the optical lens 700 in Embodiment 7 are shown in Table 7-1.
[0166] Table 7-1
[0167]
[0168]
[0169] The aspherical surface parameters of the optical lens 700 in Embodiment 7 are shown in Table 7-2.
[0170] Table 7-2
[0171] K B C D E F S5 -1.49E+01 1.48E-02 -1.58E-02 -3.11E-03 2.54E-03 -5.94E-04 S6 -8.72E+00 1.70E-02 -1.29E-02 -1.80E-03 1.78E-03 -3.00E-04 S7 -1.00E+02 1.61E-02 8.57E-04 -8.09E-04 3.82E-04 -3.45E-05 S8 -1.15E+00 -1.83E-02 4.18E-03 -3.03E-04 -1.76E-04 7.94E-05 S9 1.00E+02 -6.74E-02 7.62E-03 -2.39E-03 5.18E-04 -3.72E-05 S10 -6.95E-02 -3.44E-02 2.84E-03 2.49E-04 -1.02E-04 8.17E-06 S11 6.35E-01 6.45E-03 -1.29E-03 -3.26E-04 1.25E-04 -1.19E-05 S12 -1.20E-01 -1.35E-02 4.11E-04 -2.40E-05 6.28E-06 -1.04E-06
[0172] In this embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 700 are shown in Figures , .
[0173] As can be seen from Figure , the distortion of the optical lens is controlled within -25% to 0, which indicates that the optical lens 700 can well correct the distortion.
[0174] As can be seen from Figure , the MTF value of this embodiment is above 0.5 in the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view in the range of 0-120 lp / mm, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.
[0175] Table 8 shows 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 CRA at the maximum image height, the maximum field of view FOV, and the numerical value corresponding to each condition in each embodiment.
[0176] Table 8
[0177]
[0178]
[0179] In summary, the optical lens provided by the present application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of miniaturization, large target surface, large aperture, large field of view, high imaging quality, and the like.
[0180] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection 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.
[0181] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope 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, six pieces of lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis, successively comprises: a first lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a second lens with positive refractive power; a third lens with positive refractive power, the object side surface of which is a convex surface; a fourth lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fifth lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a sixth lens with positive refractive power; wherein the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 0.2<(R9-R10) / (R9+R10)<0.9; the object side surface half light entrance radius d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 1.07<d1 / (IH / 2) / tan(FOV / 2)<1.81; the object side surface half light entrance radius d1 of the first lens and the image side surface half light entrance radius d12 of the sixth lens satisfy: 0.88<d1 / d12<1.
45.
2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.4<TTL / f<2.9; 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: 1.8<TTL / IH<2.
3.
3. The optical lens of claim 1, wherein, 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: 1.7<IH / EPD<2.7; 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: 1.1<IH / f<1.
5.
4. The optical lens of claim 1, wherein, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 36.2°<FOV / Fno<40.01°.
5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5<f1 / f<-0.9; the object side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: -9<R1 / f<-1.2; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.6<R2 / f<5.
9.
6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.7<f2 / f<9; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8<f3 / f<17.
7. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8<f4 / f<25; the object side surface curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: -14.5<R7 / f<-0.5; the image side surface curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3<R8 / f<-0.
4.
8. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: -1.3 < f5 / f < -0.8; a radius of curvature R9 of an object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.4 < R9 / f < 9; a radius of curvature R10 of an image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.2 < R10 / f < 0.
7.
9. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: 2 < f6 / f < 24; the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.6 < f5 / f6 < 0.
10. The optical lens of claim 1, wherein, A radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy: -0.1 < (R7-R8) / (R7+R8) < 1; a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: -0.6 < (R1+R2) / (R1-R2) < 0.9.
Citation Information
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