Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, and the six lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a concave surface; a second lens with positive optical power, wherein the object side surface and the image side surface of the second lens are both convex surfaces; a third lens with positive optical power, wherein the image side surface of the third lens is a convex surface; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is a convex surface and the image side surface of the fourth lens is a concave surface; a fifth lens with negative optical power, wherein the image side surface of the fifth lens is a concave surface; and a sixth lens with negative optical power. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization and long focal length.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] In recent years, with the rapid development of automobile auxiliary driving technology, optical lenses are increasingly widely used in automobiles.

[0003] At present, higher requirements are put forward for the performance and structure of vehicle-mounted optical lenses for safety and other reasons. For example, due to the iterative update of the demand for lens placement position, the installation position of the lens is limited, and the demand for miniaturization of the lens is increasingly intense. At the same time, the demand for large image surface and small aperture is also increasing, in order to realize higher pixel requirements and improve the resolving power, seven, eight or more lens structures are usually selected, but this will seriously affect the miniaturization of the lens.

[0004] Therefore, how to make the optical lens realize large imaging size, small aperture, and long focal characteristics, etc., to meet the performance requirements of vehicle-mounted applications, is the goal pursued by the lens in the field. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as small aperture, large image surface, miniaturization, long focal characteristics, etc.

[0006] The present application provides an optical lens, which has a total of six lenses, and comprises, in order from the object side to the imaging surface along the optical axis:

[0007] a first lens with negative focal power, the object side surface of which is concave;

[0008] a second lens with positive focal power, both the object side surface and the image side surface of which are convex;

[0009] a third lens with positive focal power, the image side surface of which is convex;

[0010] a fourth lens with positive focal power, the object side surface of which is convex and the image side surface of which is concave;

[0011] a fifth lens with negative focal power, the image side surface of which is concave;

[0012] a sixth lens with negative focal power.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.8 < TTL / f < 2.5.

[0014] It is further preferred that the effective focal length f of the optical lens and the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.05.

[0015] It is further preferred that the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55 < IH / f < 0.7.

[0016] It is further preferred that the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.3.

[0017] It is further preferred that the real image height IH corresponding to the maximum field angle, the total optical length TTL and the maximum field angle FOV of the optical lens satisfy: 60.0 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.0.

[0018] It is further preferred that the sum of the central thicknesses of the first lens to the sixth lens ∑CT and the total optical length TTL of the optical lens satisfy: 0.55 < ∑CT / TTL < 0.8.

[0019] It is further preferred that the maximum field angle FOV, the real image height IH corresponding to the maximum field angle and the object side clear aperture D1 of the first lens of the optical lens satisfy: 3.0 < D1 / IH / tan(FOV / 2) < 3.8.

[0020] It is further preferred that the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.0 < f1 / f < -1.0.

[0021] It is further preferred that the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f2 / f < 1.8.

[0022] It is further preferred that the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.4 < f3 / f < 1.9.

[0023] It is further preferred that the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.9 < f4 / f < 1.3.

[0024] It is further preferred that the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -0.9 < f5 / f < -0.5.

[0025] It is further preferred that the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -3.0.

[0026] Further preferably, an effective focal length f of the optical lens and a curvature radius R1 of the object side of the first lens satisfy: -2.0 < R1 / f < -0.6.

[0027] Further preferably, an effective focal length f of the optical lens and a curvature radius R6 of the image side of the third lens satisfy: -1.4 < R6 / f < -0.5.

[0028] Further preferably, an effective focal length f of the optical lens and a curvature radius R10 of the image side of the fifth lens satisfy: 0.4 < R10 / f < 0.7.

[0029] Further preferably, a curvature radius R3 of the object side and a curvature radius R4 of the image side of the second lens satisfy: 2.7 < |(R3-R4) / (R3+R4)|.

[0030] Further preferably, a curvature radius R7 of the object side and a curvature radius R8 of the image side of the fourth lens satisfy: -0.88 < (R7-R8) / (R7+R8) < -0.78.

[0031] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0032] 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:

[0033] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0034] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0035] Figure 3 FIG. 6 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0036] Figure 4 FIG. 7 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0037] Figure 5 FIG. 10 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0038] Figure 6 FIG. 11 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0039] Figure 7 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0040] Figure 8 MTF curve diagram of the optical lens in Embodiment 4 of the present application.

[0041] Figure 9 Structure diagram of the optical lens in Embodiment 5 of the present application.

[0042] Figure 10 MTF curve diagram of the optical lens in Embodiment 5 of the present application.

[0043] Figure 11 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0044] Figure 12 MTF curve diagram of the optical lens in Embodiment 6 of the present application.

[0045] Figure 13 Structure diagram of the optical lens in Embodiment 7 of the present application.

[0046] Figure 14 MTF curve diagram of the optical lens in Embodiment 7 of the present application.

[0047] Figure 15 Structure diagram of the optical lens in Embodiment 8 of the present application.

[0048] Figure 16 MTF curve diagram of the optical lens in Embodiment 8 of the present application.

[0049] Figure 17 Structure diagram of the optical lens in Embodiment 9 of the present application.

[0050] Figure 18 MTF curve diagram of the optical lens in Embodiment 9 of the present application.

[0051] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0052] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. 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.

[0053] It should be noted that the terms first, second, third, etc. in the present specification are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, 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.

[0054] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0055] In the present specification, the paraxial region refers to a region near the optical axis. If the 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 the 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 imaging surface is referred to as the image side surface of the lens.

[0056] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when expressions such as "at least one of" appear after a list of one or more items, the phrase "at least one of" modifies the entire list of items and does not modify the list of items individually. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0057] Unless otherwise defined, all terms used in this specification, including technical and scientific terms, 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.

[0058] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0059] The optical lens provided by the embodiments 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.

[0060] In some embodiments, the first lens has negative focal power, which is conducive to diverging light rays. The light rays exiting the image side of the first lens can provide a larger light receiving surface for the subsequent optical system, thereby reducing the front aperture.

[0061] In some embodiments, the second lens has positive focal power, which is conducive to converging light rays. In combination with the first lens having negative focal power, the total length of the optical lens can be reduced, and the converging effect can further reduce the rear aperture. The object side and the image side of the second lens are both convex, which can receive the diverging light rays from the first lens and smoothly enter the rear. By moderately converging the front light rays, the light energy loss is reduced, which is conducive to preliminary aberration correction of the incident light rays and to achieving high resolution and improving the resolution capability of the optical lens.

[0062] In some embodiments, the third lens has positive focal power, which is conducive to receiving the converging light rays from the second lens and reducing the height of the light beam incident to the object side of the fourth lens, thereby reducing the aperture of the object side of the fourth lens. The image side of the third lens is convex, which can deflect the edge field of view light rays toward the optical axis after passing through the image side of the third lens, thereby reducing the rear aperture of the system.

[0063] In some embodiments, the fourth lens has positive focal power, which is conducive to converging light rays. In combination with the fifth lens, the aberration of the optical lens can be effectively corrected, the imaging quality can be improved, and the optical performance such as distortion can be optimized. The object side of the fourth lens is convex, and the image side is concave, which can reduce the angle between the incident light rays of the edge field of view and the surface normal of the object side, avoid light divergence, reduce sensitivity, and at the same time make the height of the edge field of view light rays incident to the fifth lens higher and the width wider, thereby improving the relative illumination of the edge field of view. The shape of the fourth lens is a crescent shape, and the difference between the changes of the two surfaces is small with temperature change, which is conducive to achieving better thermal stability at high temperatures.

[0064] In some embodiments, the fifth lens has negative focal power, which is conducive to diverging light rays, making the subsequent optical system have a larger light receiving surface, and improving the optical performance. The image side of the fifth lens is concave, which can diverge the central field of view light rays, so that the light rays can reach a higher imaging position, and at the same time, the incident angle of the light rays entering the chip is reduced, which helps to improve the illumination and reduce the chromatic aberration.

[0065] In some embodiments, the sixth lens has negative focal power, which is conducive to diverging light rays, making the peripheral light rays and the central light rays turn upward to reach a higher imaging position, thereby increasing the imaging area of the optical lens.

[0066] In some embodiments, the optical lens can further include a diaphragm, which can be located between the first lens and the second 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 first lens and the second lens, it is beneficial to effectively converge the light entering the optical lens, reduce the lens aperture of the rear end of the optical system, and reduce the sensitivity of the optical lens. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in alternative embodiments, the diaphragm can also be arranged at other positions as needed.

[0067] In some embodiments, the optical lens can further include a filter and / or a protective glass arranged between the sixth lens and the imaging surface, which can filter light with different wavelengths and prevent damage to the image-side elements (e.g., a chip) of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.8 < TTL / f < 2.5. Satisfying the above range means that the optical length of the optical lens can be effectively limited, which is beneficial to realize the miniaturization of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the maximum field of view FOV and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.05. Satisfying the above range means that the optical distortion of the optical lens can be controlled within a small range, which is beneficial to improve the imaging quality of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 0.55 < IH / f < 0.7. Satisfying the above range means that the optical lens can achieve a larger imaging surface, which is beneficial to improve the imaging quality of the optical lens.

[0071] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.3. Satisfying the above range means that the optical lens has a longer back focus, which is beneficial to reduce the assembly of the interference module and improve the production yield.

[0072] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens, the total optical length TTL, and the maximum field of view FOV satisfy: 60.0 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.0. Satisfying the above range can balance between large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0073] In some embodiments, a sum of central thicknesses of the first lens to the sixth lens ∑CT satisfies 0.55 < ∑CT / TTL < 0.8, where TTL is a total track length of the optical lens. The above range is beneficial to compress the total length and volume of the optical lens while maintaining the miniaturization of the optical lens.

[0074] In some embodiments, a maximum field of view FOV of the optical lens, a real image height IH corresponding to the maximum field of view, and an object-side aperture diameter D1 of the first lens satisfy 3.0 < D1 / IH / tan(FOV / 2) < 3.8. The above range is beneficial to balance the front aperture size and the field of view and the image surface of the optical lens, and to improve the imaging quality of the optical lens.

[0075] In some embodiments, a focal length f1 of the first lens and an effective focal length f of the optical lens satisfy -2.0 < f1 / f < -1.0. The above range is beneficial to diverge light rays, and the light rays emitted from the image-side surface of the first lens can have a larger light acceptance surface for the subsequent optical system under the same field of view, thereby reducing the front aperture.

[0076] In some embodiments, a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy 0.8 < f2 / f < 1.8. The above range is beneficial to converge light rays, and the combination of the first lens with negative optical power can reduce the total length of the optical lens and further reduce the rear aperture.

[0077] In some embodiments, a focal length f3 of the third lens and an effective focal length f of the optical lens satisfy 1.4 < f3 / f < 1.9. The above range is beneficial to receive the light rays converged from the second lens, to reduce the height of the light beam incident on the object-side surface of the fourth lens, and to reduce the aperture of the object-side surface of the fourth lens.

[0078] In some embodiments, a focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy 0.9 < f4 / f < 1.3. The above range is beneficial to converge light rays, and the combination of the fourth lens and the fifth lens can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize the optical performance such as distortion.

[0079] In some embodiments, a focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy -0.9 < f5 / f < -0.5. The above range is beneficial to diverge light rays, to make the subsequent optical system have a larger light acceptance surface, and to effectively correct various aberrations caused by the front lens and improve the imaging quality of the optical lens.

[0080] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f <-3.0. Satisfying the above range is beneficial to diverging light rays, making peripheral light rays and central light rays turn upward to reach a higher imaging position, and increasing the imaging area of the optical lens.

[0081] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R1 of the object side surface of the first lens satisfy: -2.0 < R1 / f < -0.6. Satisfying the above range can diverge light rays passing through the object side surface of the first lens, so that the subsequent optical system has a larger light acceptance surface.

[0082] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -1.4 < R6 / f < -0.5. Satisfying the above range can make the edge field of view light rays deviate towards the optical axis after passing through the image side surface of the third lens, which is beneficial to reducing the system rear aperture.

[0083] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0.4 < R10 / f < 0.7. Satisfying the above range can diverge central field of view light rays, so that the light rays can reach a higher imaging position, while reducing the incidence angle of the light rays into the chip, which is helpful to improve the illumination and reduce the chromatic aberration.

[0084] In some embodiments, the radius of curvature R3 of the object side surface and the radius of curvature R4 of the image side surface of the second lens satisfy: 2.7 < |(R3-R4) / (R3+R4)|. Satisfying the above range can accept the diverged light rays from the first lens and make them smoothly enter the rear; by moderately converging the front light rays, the light rays transition smoothly, reducing the loss of light energy, which is beneficial to the preliminary aberration correction of the incident light rays, and is beneficial to realizing high resolution and improving the resolution capability of the optical lens.

[0085] In some embodiments, the radius of curvature R7 of the object side surface and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.88 < (R7-R8) / (R7+R8) < -0.78. Satisfying the above range can reduce the angle between the edge field of view incident light rays and the surface normal of the object side surface, avoid light divergence, reduce sensitivity, and at the same time make the edge field of view exit light rays higher in height and wider in width when reaching the fifth lens, thereby improving the relative illumination of the edge field of view.

[0086] In some embodiments, the fourth lens and the fifth lens can be glued to form a glued 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; 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.

[0087] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth 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 optical lens.

[0088] In various embodiments of the present application, when the lenses adopt aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0089]

[0090] 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 A, B, C, D, E and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order surface coefficients, respectively.

[0091] 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.

[0092] Embodiment 1

[0093] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the present application. The optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.

[0094] The first lens L1 has a negative focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface. The second lens L2 has a positive focal power, and the object side S3 and the image side S4 are both convex surfaces. The third lens L3 has a positive focal power, and the object side S5 and the image side S6 are both convex surfaces. The fourth lens L4 has a positive focal power, the object side S7 is a convex surface, and the image side S8 is a concave surface. The fifth lens L5 has a negative focal power, the object side S8 is a convex surface, and the image side S9 is a concave surface. The fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface is S8. The sixth lens L6 has a negative focal power, the object side S10 is a convex surface, and the image side S11 is a concave surface. The object side S12 and the image side S13 of the filter G1 are both flat surfaces. The imaging surface S14 is a flat surface.

[0095] The first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses; the second lens L2 and the sixth lens L6 are glass aspherical lenses.

[0096] The first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses; the second lens L2 and the sixth lens L6 are glass aspherical lenses.

[0097] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0098] Table 1-1

[0099]

[0100]

[0101] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0102] Table 1-2

[0103] Face number K A B C D E F S3 -3.95E+01 0.00E+00 0.00E+00 -5.44E-06 3.12E-07 -9.14E-09 1.04E-10 S4 9.22E-01 0.00E+00 0.00E+00 -6.20E-07 5.40E-08 -1.44E-09 1.55E-11 S10 1.38E+01 0.00E+00 -1.51E-03 6.21E-05 -6.97E-06 3.13E-07 -5.37E-09 S11 2.40E+00 0.00E+00 -1.28E-03 6.53E-05 -6.09E-06 2.68E-07 -4.09E-09

[0104] In this embodiment, Figure 2 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 0.3 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.

[0105] Embodiment 2

[0106] Please refer to Figure 3 , which is a structural schematic diagram of the optical lens provided in Embodiment 2 of the application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of the lens surface and the lens thickness are different.

[0107] The related parameters of the lenses in the optical lens in Embodiment 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110]

[0111] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 2 are shown in Table 2-2.

[0112] Table 2-2

[0113] Face number K A B C D E F S3 -1.34E+00 0.00E+00 0.00E+00 -4.05E-06 3.08E-07 -9.54E-09 1.14E-10 S4 -4.94E+00 0.00E+00 0.00E+00 -4.73E-07 6.08E-08 -1.35E-09 1.27E-11 S10 7.15E+00 0.00E+00 -3.03E-04 -3.40E-05 6.48E-06 -2.71E-07 3.95E-09 S11 8.00E+01 0.00E+00 2.54E-04 -4.45E-05 7.68E-06 -3.05E-07 4.73E-09

[0114] From Figure 4 It can be seen from the MTF values in the full field of view are above 0.2, in the range of 0-120 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in the case of low frequency and high frequency.

[0115] Embodiment 3

[0116] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens provided in embodiment 3 of the present application, compared with embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness of the cemented lens are different.

[0117] The related parameters of each lens in the optical lens in embodiment 3 are shown in Table 3-1.

[0118] Table 3-1

[0119]

[0120]

[0121] The surface type parameters of the aspherical lens of the optical lens in embodiment 3 are shown in Table 3-2.

[0122] Table 3-2

[0123] Face number K A B C D E F S3 -2.47E-01 0.00E+00 0.00E+00 -4.01E-06 3.07E-07 -9.23E-09 1.07E-10 S4 -8.13E+00 0.00E+00 0.00E+00 8.45E-08 5.85E-08 -1.30E-09 1.27E-11 S11 7.05E+01 0.00E+00 -7.18E-04 -3.79E-05 6.57E-06 -2.62E-07 4.09E-09 S12 8.00E+01 0.00E+00 -3.98E-04 -4.57E-05 7.41E-06 -2.92E-07 4.68E-09

[0124] From Figure 6 It can be seen from the MTF values in the full field of view are above 0.3, in the range of 0-120 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has better imaging quality and better detail resolution capability in the case of low frequency and high frequency.

[0125] Embodiment 4

[0126] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens provided in embodiment 4 of the present application, compared with embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness of the cemented lens are different.

[0127] The related parameters of each lens in the optical lens in embodiment 4 are shown in Table 4-1.

[0128] Table 4-1

[0129]

[0130]

[0131] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0132] Table 4-2

[0133] Face number K A B C D E F S3 -2.17E-01 0.00E+00 0.00E+00 -4.21E-06 3.07E-07 -9.01E-09 1.01E-10 S4 -1.43E+01 0.00E+00 0.00E+00 4.89E-07 5.54E-08 -1.34E-09 1.33E-11 S11 -8.00E+01 0.00E+00 -9.38E-04 -4.03E-05 6.78E-06 -2.53E-07 3.52E-09 S12 3.77E+01 0.00E+00 -7.76E-04 -4.69E-05 7.53E-06 -2.83E-07 4.15E-09

[0134] It can be seen from Figure 8 that the MTF values of the present embodiment are all above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have qualified imaging quality and qualified detail resolution ability in both low and high frequency cases.

[0135] Embodiment 5

[0136] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main difference of the present embodiment 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.

[0137] The related parameters of the lenses in the optical lens in Embodiment 5 are shown in Table 5-1.

[0138] Table 5-1

[0139]

[0140]

[0141] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0142] Table 5-2

[0143] Face number K A B C D E F S3 -4.99E+01 0.00E+00 0.00E+00 -5.84E-06 3.03E-07 -9.21E-09 1.11E-10 S4 2.43E+00 0.00E+00 0.00E+00 -6.94E-07 5.60E-08 -1.40E-09 1.45E-11 S10 1.37E+01 0.00E+00 -1.59E-03 6.05E-05 -6.97E-06 3.13E-07 -5.37E-09 S11 2.40E+00 0.00E+00 -1.30E-03 6.48E-05 -6.09E-06 2.69E-07 -4.04E-09

[0144] It can be seen from Figure 10 that the MTF values of the present embodiment are all above 0.3 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have better imaging quality and better detail resolution ability in both low and high frequency cases.

[0145] Embodiment 6

[0146] Please refer to Figure 11The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0147] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0148] Table 6-1

[0149]

[0150] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0151] Table 6-2

[0152] Face number K A B C D E F S3 -2.71E+00 0.00E+00 0.00E+00 -4.33E-06 2.99E-07 -9.44E-09 1.14E-10 S4 -4.91E+00 0.00E+00 0.00E+00 -7.98E-07 5.55E-08 -1.32E-09 1.22E-11 S10 6.29E+00 0.00E+00 -9.97E-04 -2.36E-05 6.99E-06 -2.73E-07 3.61E-09 S11 8.00E+01 0.00E+00 -3.63E-04 -3.67E-05 8.24E-06 -3.05E-07 4.45E-09

[0153] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.2 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 qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0154] Example 7

[0155] Please see Figure 13 The figure shown is a schematic diagram of the optical lens provided in Embodiment 7 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the lens is cemented, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0156] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0157] Table 7-1

[0158]

[0159] The surface profile parameters of the aspherical lens in Example 7 are shown in Table 7-2.

[0160] Table 7-2

[0161] Face number K A B C D E F S3 -9.67E-01 0.00E+00 0.00E+00 -4.33E-06 3.06E-07 -9.01E-09 1.03E-10 S4 -1.54E+01 0.00E+00 0.00E+00 3.80E-07 5.48E-08 -1.32E-09 1.39E-11 S10 -8.00E+01 0.00E+00 -1.24E-03 -4.39E-05 6.84E-06 -2.48E-07 3.43E-09 S11 3.45E+01 0.00E+00 -1.05E-03 -5.34E-05 7.80E-06 -2.77E-07 3.66E-09

[0162] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.3 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 8

[0164] Please see Figure 15 The figure shown is a schematic diagram of the optical lens provided in Embodiment 8 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the lens is cemented, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0165] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0166] Table 8-1

[0167]

[0168] The surface profile parameters of the aspherical lens in Example 8 are shown in Table 8-2.

[0169] Table 8-2

[0170] Face number K A B C D E F S3 -1.97E+00 0.00E+00 0.00E+00 -4.13E-06 3.00E-07 -9.34E-09 1.13E-10 S4 -6.94E+00 0.00E+00 0.00E+00 -3.50E-07 5.41E-08 -1.22E-09 1.16E-11 S10 8.00E+01 0.00E+00 -1.34E-03 -3.89E-05 6.85E-06 -2.51E-07 3.36E-09 S11 -8.00E+01 0.00E+00 -7.81E-04 -4.47E-05 7.88E-06 -2.86E-07 4.13E-09

[0171] from Figure 16 As can be seen, the MTF value of this embodiment is above 0.3 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.

[0172] Example 9

[0173] Please see Figure 17 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 9 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0174] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0175] Table 9-1

[0176]

[0177] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0178] Table 9-2

[0179] Face number K A B C D E F S3 -4.34E+00 0.00E+00 0.00E+00 -3.00E-06 7.61E-08 -2.79E-09 2.12E-11 S4 -5.06E+01 0.00E+00 0.00E+00 2.81E-06 -7.44E-08 6.92E-10 -2.71E-12 S10 1.45E+01 0.00E+00 -4.30E-04 -1.27E-05 -1.11E-06 6.34E-08 -8.86E-10 S11 8.00E+01 0.00E+00 8.23E-05 -3.12E-05 9.37E-07 -1.30E-08 4.00E-10

[0180] from Figure 18It can be seen that the MTF value of the embodiment is above 0.3 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 capability in the case of low frequency and high frequency.

[0181] Please refer to Table 10, the optical properties 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 and the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0182] Table 10

[0183]

[0184] Table 10 (continued)

[0185]

[0186]

[0187] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, etc.

[0188] 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.

[0189] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several 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 six lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a concave object side. A second lens with positive optical power has convex surfaces on both its object-side and image-side surfaces. The third lens with positive optical power has a convex image-side surface; The fourth lens with positive optical power has a convex object side and a concave image side. The fifth lens has negative optical power and its image-side surface is concave. A sixth lens with negative optical power; The effective focal length f and the total optical length TTL of the optical lens satisfy: 1.8 <TTL / f<2.5; The object-side radius of curvature R7 and the image-side radius of curvature R8 of the fourth lens satisfy: -0.88 < (R7 - R8) / (R7 + R8) < -0.

78.

2. The optical lens according to claim 1, characterized in that, The effective focal length f and the total optical length TTL of the optical lens satisfy the following condition: 1.92≤TTL / f≤2.

36.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 0.55 <IH / f<0.7。 4. The optical lens according to claim 1, characterized in that, The effective focal length f and the optical back focal length BFL of the optical lens satisfy: 0.2 <BFL / f<0.3。 5. The optical lens according to claim 1, characterized in that, The true image height IH, total optical length TTL, and maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy the following condition: 60.0 < 180° × TTL / (IH / 2) / (FOV / 2) < 80.

0.

6. The optical lens according to claim 1, characterized in that, The sum of the center thicknesses of the first lens to the sixth lens, ∑CT, and the total optical length TTL of the optical lens satisfy the following condition: 0.55 < ∑CT / TTL < 0.

8.

7. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens, the true image height (IH) corresponding to the maximum field of view, and the object-side aperture (D1) of the first lens satisfy the following condition: 3.0 <D1 / IH / tan(FOV / 2)<3.8。 8. The optical lens according to claim 1, characterized in that, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy the condition: -6.56 ≤ f6 / f < -3.

0.

9. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R3 and the image-side radius of curvature R4 of the second lens satisfy: 2.7 < |(R3-R4) / (R3+R4)| ≤ 21.

59.

10. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R7 and the image-side radius of curvature R8 of the fourth lens satisfy: -0.84≤(R7-R8) / (R7+R8)≤-0.82.

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