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; a second lens with positive optical power, the object side surface and the image side surface of the second lens are both convex; a third lens with positive optical power, the object side surface and the image side surface of the third lens are both convex; a fourth lens with positive optical power, the object side surface of the fourth lens is convex; a fifth lens with negative optical power, the image side surface of the fifth lens is concave; 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 demand for updating iteration of the placement position of the lens, 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 high 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, so as 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 refractive power;

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

[0009] a third lens with positive refractive power, both the object side surface and the image side surface of which are convex;

[0010] a fourth lens with positive refractive power, the object side surface of which is convex;

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

[0012] a sixth lens with negative refractive power.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 2.0 < TTL / f < 2.5.

[0014] Further preferably, the effective focal length f of the optical lens, 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.

[0015] Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 0.55<IH / f<0.7.

[0016] Further preferably, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2<BFL / f<0.4.

[0017] Further preferably, the real image height IH corresponding to the maximum field of view angle, the total track length TTL and the maximum field of view angle FOV of the optical lens satisfy: 70.0<180°xTTL / (IH / 2) / (FOV / 2)<80.0.

[0018] Further preferably, the sum ∑CT of the central thicknesses of each lens of the first lens to the sixth lens and the total track length TTL of the optical lens satisfy: 0.5<∑CT / TTL<0.8.

[0019] Further preferably, the maximum field of view angle FOV, the real image height IH corresponding to the maximum field of view angle and the entrance pupil diameter D1 of the first lens of the optical lens satisfy: 3.1<D1 / IH / tan(FOV / 2)<3.8.

[0020] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.8<f1 / f<-1.0.

[0021] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.8<f2 / f<2.3.

[0022] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2<f3 / f<1.9.

[0023] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8<f4 / f<1.3.

[0024] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.0<f5 / f<-0.5.

[0025] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f<-1.0.

[0026] Further preferably, the effective focal length f of the optical lens and the entrance pupil diameter D1 of the first lens satisfy: 0.5<D1 / f<0.9.

[0027] It is further preferred that an effective focal length f of the optical lens and an image-side radius of curvature R10 of the fifth lens satisfy: 0.4 < R10 / f < 1.0.

[0028] It is further preferred that an object-side radius of curvature R3 and an image-side radius of curvature R4 of the second lens satisfy: 1.05 < |(R3-R4) / (R3+R4)|.

[0029] It is further preferred that an object-side radius of curvature R5 and an image-side radius of curvature R6 of the third lens satisfy: 1.01 < (R5-R6) / (R5+R6).

[0030] 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

[0031] 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:

[0032] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0033] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0034] Figure 3 FIG. 3 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0035] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0036] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0037] Figure 6 FIG. 6 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0038] Figure 7 FIG. 7 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0039] Figure 8 FIG. 8 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0040] Figure 9 FIG. 9 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0041] Figure 10 MTF curve of the optical lens in Embodiment 5 of the present application.

[0042] Figure 11 schematic structural diagram of the optical lens in Embodiment 6 of the present application.

[0043] Figure 12 MTF curve of the optical lens in Embodiment 6 of the present application.

[0044] Figure 13 schematic structural diagram of the optical lens in Embodiment 7 of the present application.

[0045] Figure 14 MTF curve of the optical lens in Embodiment 7 of the present application.

[0046] Figure 15 schematic structural diagram of the optical lens in Embodiment 8 of the present application.

[0047] Figure 16 MTF curve of the optical lens in Embodiment 8 of the present application.

[0048] Figure 17 schematic structural diagram of the optical lens in Embodiment 9 of the present application.

[0049] Figure 18 MTF curve of the optical lens in Embodiment 9 of the present application.

[0050] Figure 19 schematic structural diagram of the optical lens in Embodiment 10 of the present application.

[0051] Figure 20 MTF curve of the optical lens in Embodiment 10 of the present application.

[0052] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0053] 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.

[0054] It should be noted that in the present specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, 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.

[0055] 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 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.

[0056] In this document, 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0057] It should also be understood that the words "comprise", "comprising", "has", "having", "include", "including" and / or "contains", "containing", when used in this specification, indicate the presence of the 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, it indicates that any one of the listed items can be present, or a combination of two or more of the listed items can be present. In addition, when describing embodiments of the present application, the word "may" means "one or more embodiments of the present application". Furthermore, the word "exemplary" is intended to mean an example or illustration.

[0058] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0059] It should be noted that the embodiments 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 combination with the embodiments.

[0060] 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.

[0061] In some embodiments, the first lens has a negative focal power, which is conducive to diverging light rays. Under the same field of view angle condition, the light rays emitted through the image side surface of the first lens can make the subsequent optical system have a larger light ray acceptance surface, thereby reducing the front aperture.

[0062] In some embodiments, the second lens has positive refractive power, which is conducive to converging light rays, and in combination with the first lens having negative refractive power, can reduce the total length of the optical lens and further reduce the back 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 ray transition is smooth, the light energy loss is reduced, which is conducive to preliminary aberration correction of the incident light rays, conducive to achieving high resolution, and improving the resolution capability of the optical lens.

[0063] In some embodiments, the third lens has positive refractive power, which is conducive to receiving the converging light rays from the second lens, reducing the height of the light beam incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens. The object side and the image side of the third lens are both convex, 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, is conducive to correcting the stop aberration, and further improving the imaging quality of the optical lens.

[0064] In some embodiments, the fourth lens has positive refractive power, which is conducive to converging light rays, and in combination with the fifth lens, can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize the optical performance such as distortion. The object side of the fourth lens is convex, which can compress light rays, smoothly and smoothly incident to the fifth lens, reduce the sensitivity of the optical lens, and also enable the light rays to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0065] In some embodiments, the fifth lens has negative refractive power, which is conducive to diverging light rays, enabling the subsequent optical system to have a larger light acceptance surface, improving the optical performance, effectively correcting various aberrations caused by the front lens, and improving the imaging quality of the optical lens. 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 incidence angle of the light rays entering the chip is reduced, which helps to improve the illumination and reduce the chromatic aberration.

[0066] In some embodiments, the sixth lens has negative refractive power, which is conducive to diverging light rays, enabling the peripheral light rays and the central light rays to turn upward and reach a higher imaging position, and increasing the imaging area of the optical lens.

[0067] In some embodiments, the optical lens can further include a stop, which can be located between the first lens and the second lens. It can be understood that the stop is used to limit the amount of light to change the brightness of the image. When the stop is located between the first lens and the second lens, it is conducive to effectively converging the light rays entering the optical lens, reducing the lens aperture of the rear end of the optical system, and reducing the sensitivity of the optical lens. However, it should be noted that the position of the stop disclosed herein is only an example and not a limitation; in alternative embodiments, the stop can also be arranged at other positions according to actual needs.

[0068] In some embodiments, the optical lens can further comprise a filter and / or a protective glass disposed between the sixth lens and the imaging surface, capable of filtering light with different wavelengths and preventing damage to the image-side elements (e.g., a chip) of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the total track length TTL satisfy: 2.0 < TTL / f < 2.5. Satisfying the above range means that the optical length of the optical lens can be effectively limited, which is conducive to realizing the miniaturization of the optical lens.

[0070] 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 smaller range, which is conducive to improving the imaging quality of the optical lens.

[0071] 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 conducive to improving the imaging quality of the optical lens.

[0072] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.2 < BFL / f < 0.4. Satisfying the above range means that the optical lens has a longer back focus, which is conducive to reducing the assembly of the interference module and improving the production yield.

[0073] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens, the total track length TTL, and the maximum field of view FOV satisfy: 70.0 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.0. Satisfying the above range can achieve a balance between large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0074] In some embodiments, the sum ∑CT of the center thicknesses of the first lens to the sixth lens and the total track length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.8. Satisfying the above range is conducive to compressing the total length and volume of the optical lens and maintaining the miniaturization of the optical lens.

[0075] In some embodiments, the maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the light entrance aperture D1 of the object side of the first lens satisfy: 3.1 < D1 / IH / tan(FOV / 2) < 3.8. Satisfying the above range can balance the front aperture size of the optical lens, the field of view, and the image surface, and improve the imaging quality of the optical lens.

[0076] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.8 < f1 / f < -1.0. Satisfying the above range is conducive to diverging light rays, and under the same field of view condition, the light rays emitted from the image side of the first lens can have a larger light acceptance surface for the subsequent optical system, thereby reducing the front aperture.

[0077] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f2 / f < 2.3. Satisfying the above range is conducive to converging light rays, and in combination with the first lens having negative refractive power, the total length of the optical lens can be reduced, and the converging effect on the light rays can further reduce the rear aperture.

[0078] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f3 / f < 1.9. Satisfying the above range is conducive to receiving the light rays converged from the second lens, reducing the height of the light beam incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0079] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8 < f4 / f < 1.3. Satisfying the above range is conducive to converging light rays, and 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.

[0080] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.0 < f5 / f < -0.5. Satisfying the above range is conducive to diverging light rays, so that the subsequent optical system has a larger light acceptance surface, and the optical performance can be effectively corrected to improve the imaging quality of the optical lens.

[0081] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -1.0. Satisfying the above range is conducive to diverging light rays, so that the peripheral light rays and the central light rays are turned upward to reach a higher imaging position, thereby increasing the imaging area of the optical lens.

[0082] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.5 < R7 / f < 0.9. Satisfying the above range can compress the light rays, make the light rays smoothly incident to the fifth lens, reduce the sensitivity of the optical lens, and make the light rays turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[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 < 1.0. Satisfying the above range can diverge the central field of view light rays, make the light rays reach a higher imaging position, and reduce the incidence angle of the light rays entering the chip, thereby improving the illumination and reducing the chromatic aberration.

[0084] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface satisfy: 1.05 < |(R3-R4) / (R3+R4)|. Satisfying the above range can receive the diverged light rays from the first lens and make the light rays smoothly enter the rear; by moderately converging the front light rays, the light rays transition smoothly, the light energy loss is reduced, the incident light rays are preliminarily aberration-corrected, the high resolution is realized, and the resolution capability of the optical lens is improved.

[0085] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface satisfy: 1.01 < (R5-R6) / (R5+R6). Satisfying the above range can reduce the angle between the edge field of view incident light rays and the normal of the object side surface, avoid light ray divergence, reduce the sensitivity, and be beneficial to correcting the stop aberration, thereby further improving the imaging quality of the optical lens.

[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, improve the imaging quality of the optical lens, reduce the assembly sensitivity of the optical lens, and further reduce the processing difficulty of the optical lens and improve 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 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.

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

[0089]

[0090] 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 quadratic curved 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 curved surface coefficients, respectively.

[0091] 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 preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, replacement, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and should be included in the protection scope of the 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 application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a stop 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, the object side S3 and the image side S4 are convex surfaces; the third lens L3 has a positive focal power, 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

[0095] 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, and 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; and the imaging surface S14 is a flat surface.

[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

[0097] L2 and the sixth lens L6 are glass aspherical lenses.

[0098] The related parameters of each lens in the optical lens in the embodiment 1 are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101]

[0102] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0103] Table 1-2

[0104] 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

[0105] In the present 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. It can be seen from the figure that the MTF value of the present 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 both low and high frequency cases.

[0106] Embodiment 2

[0107] Please refer to Figure 3 , which is a structural schematic diagram of the optical lens provided in Embodiment 2 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 are different.

[0108] The related parameters of each lens in the optical lens in Embodiment 2 are shown in Table 2-1.

[0109] Table 2-1

[0110]

[0111]

[0112] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 2 are shown in Table 2-2.

[0113] Table 2-2

[0114] 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

[0115] It can be seen from Figure 4 that the MTF value of the present embodiment is above 0.2 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 qualified imaging quality and qualified detail resolution ability in both low and high frequency cases.

[0116] Embodiment 3

[0117] Referring to FIG. 3, a structural schematic diagram of an optical lens provided in Embodiment 3 of the present application is shown. Compared with Embodiment 1, the main difference of the present embodiment is that the cemented lens, the radius of curvature of each lens surface, the lens thickness and other optical parameters are different. Figure 5

[0118] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0119] Table 3-1

[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 the above, it can be seen that the MTF value of the present 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. Figure 6 Embodiment 4

[0125]

[0126] Referring to FIG. 4, a structural schematic diagram of an optical lens provided in Embodiment 4 of the present application is shown. Compared with Embodiment 1, the main difference of the present embodiment is that the cemented lens, the radius of curvature of each lens surface, the lens thickness and other optical parameters are different. Figure 7

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

[0131] Table 4-2

[0132]

[0133]

[0134] From the above, it can be seen that the MTF value of the present 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. Figure 8 ​​​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.

[0135] Example 5

[0136] Please see Figure 9 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 5 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.

[0137] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0138] Table 5-1

[0139]

[0140] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0141] Table 5-2

[0142] 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

[0143] from Figure 10 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.

[0144] Example 6

[0145] Please see Figure 11 The 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.

[0146] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0147] Table 6-1

[0148]

[0149] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0150] Table 6-2

[0151] 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

[0152] As can be seen from Figure 12 , the MTF value of the embodiment is above 0.2 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 qualified imaging quality and qualified detail resolution capability in low frequency and high frequency cases.

[0153] Embodiment 7

[0154] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens provided in the embodiment 7 of the present application, and compared with the embodiment 1, the main difference of the embodiment 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.

[0155] The related parameters of each lens in the optical lens in the embodiment 7 are shown in Table 7-1.

[0156] Table 7-1

[0157]

[0158] The surface type parameters of the aspherical lens of the optical lens in the embodiment 7 are shown in Table 7-2.

[0159] Table 7-2

[0160] 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

[0161] As can be seen from Figure 14 , 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 better imaging quality and better detail resolution capability in low frequency and high frequency cases.

[0162] Embodiment 8

[0163] Please refer to Figure 15 , which is a structural schematic diagram of the optical lens provided in the embodiment 8 of the present application, and compared with the embodiment 1, the main difference of the embodiment 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.

[0164] The related parameters of each lens in the optical lens in the embodiment 8 are shown in Table 8-1.

[0165] Table 8-1

[0166]

[0167] The surface type parameters of the aspherical lens of the optical lens in the embodiment 8 are shown in Table 8-2.

[0168] Table 8-2

[0169] 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

[0170] As can be seen from Figure 16 , 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 ability in the case of low frequency and high frequency.

[0171] Embodiment 9

[0172] Referring to Figure 17 , a structural schematic diagram of an optical lens provided in the embodiment 9 of the present application is shown, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0173] The related parameters of each lens in the optical lens in the embodiment 9 are shown in Table 9-1.

[0174] Table 9-1

[0175]

[0176]

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

[0178] Table 9-2

[0179] Face number K A B C D E F S3 -6.02E+00 0.00E+00 0.00E+00 -1.01E-06 6.94E-09 -1.05E-09 2.22E-11 S4 5.00E+01 0.00E+00 0.00E+00 -4.88E-07 5.03E-08 -1.03E-09 1.10E-11 S10 -6.13E+00 0.00E+00 -1.06E-03 -5.15E-05 -1.01E-06 1.03E-07 -6.36E-10 S11 -3.76E+00 0.00E+00 -7.81E-04 -4.68E-05 5.14E-07 6.00E-08 -4.41E-10

[0180] As can be seen from Figure 18 , the MTF value of the embodiment is above 0.2 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 qualified imaging quality and qualified detail resolution ability in the case of low frequency and high frequency.

[0181] Embodiment 10

[0182] Referring to Figure 19 , a structural schematic diagram of an optical lens provided in the embodiment 10 of the present application is shown, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0183] The related parameters of each lens in the optical lens in the embodiment 10 are shown in Table 10-1.

[0184] Table 10-1

[0185]

[0186]

[0187] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 10 are shown in Table 10-2.

[0188] Table 10-2

[0189] Face number K A B C D E F S3 -2.64E+01 0.00E+00 0.00E+00 -5.31E-06 3.08E-07 -9.82E-09 1.20E-10 S4 3.82E+01 0.00E+00 0.00E+00 -5.70E-07 4.55E-08 -1.15E-09 1.41E-11 S10 -2.43E+01 0.00E+00 -3.95E-03 2.12E-04 -6.89E-06 1.43E-07 -1.53E-09 S11 -4.19E+00 0.00E+00 -3.48E-03 2.19E-04 -7.73E-06 1.85E-07 -2.21E-09

[0190] It can be seen from Figure 20 The MTF values of the present embodiment are all above 0.4 in the full field of view, and the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view in the range of 0-120 lp / mm, and have good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0191] Please refer to Table 11 for 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 values corresponding to each conditional expression in each embodiment.

[0192] Table 11

[0193]

[0194]

[0195] Table 11 (continued)

[0196]

[0197]

[0198] 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.

[0199] In the description of the present specification, the description of 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0200] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within 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 plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power; a second lens with positive refractive power, both the object side surface and the image side surface of which are convex; a third lens with positive refractive power, both the object side surface and the image side surface of which are convex; a fourth lens with positive refractive power, the object side surface of which is convex; a fifth lens with negative refractive power, the image side surface of which is concave; a sixth lens with negative refractive power; The effective focal length f of the optical lens and the total track length TTL satisfy: 2.0 < TTL / f < 2.

5. The object side surface curvature radius R5 and the image side surface curvature radius R6 of the third lens satisfy: 1.01 < (R5-R6) / (R5+R6) ≤ 45.

58. The effective focal length f of the optical lens, 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×Tan(FOV / 2)) < 1.

05.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the total track length TTL satisfy: 2.2 ≤ TTL / f ≤ 2.

36.

3. The optical lens of claim 1, wherein, 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.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.

4.

5. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field of view, the total track length TTL and the maximum field of view FOV of the optical lens satisfy: 70.0 < 180°×TTL / (IH / 2) / (FOV / 2) < 80.

0.

6. The optical lens of claim 1, wherein, The sum of the central thicknesses of the first lens to the sixth lens ∑CT and the total track length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.

8.

7. The optical lens of claim 1, wherein, The maximum field of view FOV, the real image height IH corresponding to the maximum field of view and the object side surface light aperture D1 of the first lens of the optical lens satisfy: 3.1 < D1 / IH / tan(FOV / 2) < 3.

8.

8. The optical lens of claim 1, wherein, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -6.73 ≤ f6 / f < -1.

0.

9. The optical lens of claim 1, wherein, The object side surface curvature radius R3 and the image side surface curvature radius R4 of the second lens satisfy: 1.05 < |(R3-R4) / (R3+R4)| ≤ 21.

59.

10. The optical lens of claim 1, wherein, The object side surface curvature radius R5 and the image side surface curvature radius R6 of the third lens satisfy: 1.04 ≤ (R5-R6) / (R5+R6) ≤ 45.

58. The effective focal length f of the optical lens, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view satisfy: 0.97 ≤ (IH / 2) / (f×Tan(FOV / 2)) ≤ 1.02.

Images