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 both the object side and the image side of the first lens are concave; a second lens with positive optical power, wherein the object side of the second lens is convex; a third lens with positive optical power; a fourth lens with positive optical power, wherein the object side of the fourth lens is convex; a fifth lens with negative optical power; 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-focus characteristics.

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 six lenses, and comprises, along the optical axis from the object side to the imaging surface:

[0007] a first lens with negative focal power, both the object side surface and the image side surface of which are concave;

[0008] a second lens with positive focal power, the object side surface of which is convex;

[0009] a third lens with positive focal power;

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

[0011] a fifth lens with negative focal power;

[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: 1.9 < 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 of the optical lens and the maximum field of view angle FOV satisfy: 64.0<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<0.85.

[0019] Further preferably, the maximum field of view angle FOV of the optical lens, the real image height IH corresponding to the maximum field of view angle and the entrance pupil diameter D1 of the first lens satisfy: 3.2<D1 / IH / tan(FOV / 2)<4.2.

[0020] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f<-0.8.

[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.

[0022] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8<f3 / f<2.3.

[0023] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5<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: -1.9<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<-0.6.

[0026] Further preferably, the effective focal length f of the optical lens and the entrance pupil diameter D1 of the first lens satisfy: 0.9<D1 / f<2.8.

[0027] It is further preferred that an effective focal length f of the optical lens and a curvature radius R7 on the object side of the fourth lens satisfy: 0.4 < R7 / f < 1.0.

[0028] It is further preferred that a curvature radius R1 on the object side of the first lens and a curvature radius R2 on the image side satisfy: 1.10 < |(R1-R2) / (R1+R2)|.

[0029] 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, and long focal length. BRIEF DESCRIPTION OF DRAWINGS

[0030] 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:

[0031] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0032] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0033] Figure 3 FIG. 3 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0034] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0035] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0036] Figure 6 FIG. 6 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0037] Figure 7 FIG. 7 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0038] Figure 8 FIG. 8 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0039] Figure 9 FIG. 9 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0040] Figure 10 FIG. 10 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0041] Figure 11The structure diagram of the optical lens in the embodiment 6 of the present application.

[0042] Figure 12 The MTF curve diagram of the optical lens in the embodiment 6 of the present application.

[0043] Figure 13 The structure diagram of the optical lens in the embodiment 7 of the present application.

[0044] Figure 14 The MTF curve diagram of the optical lens in the embodiment 7 of the present application.

[0045] Figure 15 The structure diagram of the optical lens in the embodiment 8 of the present application.

[0046] Figure 16 The MTF curve diagram of the optical lens in the embodiment 8 of the present application.

[0047] Figure 17 The structure diagram of the optical lens in the embodiment 9 of the present application.

[0048] Figure 18 The MTF curve diagram of the optical lens in the embodiment 9 of the present application.

[0049] Figure 19 The structure diagram of the optical lens in the embodiment 10 of the present application.

[0050] Figure 20 The MTF curve diagram of the optical lens in the embodiment 10 of the present application.

[0051] Figure 21 The structure diagram of the optical lens in the embodiment 11 of the present application.

[0052] Figure 22 The MTF curve diagram of the optical lens in the embodiment 11 of the present application.

[0053] Figure 23 The structure diagram of the optical lens in the embodiment 12 of the present application.

[0054] Figure 24 The MTF curve diagram of the optical lens in the embodiment 12 of the present application.

[0055] Figure 25 The structure diagram of the optical lens in the embodiment 13 of the present application.

[0056] Figure 26 The MTF curve diagram of the optical lens in the embodiment 13 of the present application.

[0057] Figure 27 The structure diagram of the optical lens in the embodiment 14 of the present application.

[0058] Figure 28 MTF curve diagram of the optical lens in Embodiment 14 of the present application.

[0059] Figure 29 schematic structural diagram of the optical lens in Embodiment 15 of the present application.

[0060] Figure 30 MTF curve diagram of the optical lens in Embodiment 15 of the present application.

[0061] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0062] 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 specification, 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.

[0063] It should be noted that the expressions first, second, third, etc. in the present specification 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.

[0064] 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.

[0065] In this context, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0066] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing" when used in this specification, means that the stated features, elements and / or components are present, but not excluding the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, it modifies the entire list of features, not individual elements of the list. In addition, when describing embodiments of the present application, "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0067] 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 the present application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0068] 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 accompanying drawings and in combination with the embodiments.

[0069] 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.

[0070] In some embodiments, the first lens has a negative focal power, which is beneficial for diverging light rays. Under the same field of view angle condition, the light rays emitted from the image side of the first lens can provide a larger light ray acceptance surface for the subsequent optical system, thereby reducing the front aperture. The object side and the image side of the first lens are both concave, which can diverge the large-angle light rays passing through the first lens, thereby facilitating the correction of large-angle light ray aberration by the rear optical system and improving the imaging quality of the optical lens.

[0071] In some embodiments, the second lens has a positive focal power, which is beneficial for converging light rays. In combination with the first lens having a negative focal 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. The object side of the second lens is convex, which can receive the diverging light rays from the first lens and quickly converge the diverging light rays, thereby avoiding the emission of diverging light rays from the lens and reducing the loss of light energy.

[0072] In some embodiments, the third lens has a positive focal power, which is beneficial for receiving the converging light rays from the second lens, thereby reducing the height of the light beam incident on the object side of the fourth lens and reducing the aperture of the object side of the fourth lens.

[0073] 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 aberration of the optical lens, improve imaging quality, and optimize optical performance such as distortion.

[0074] In some embodiments, the fifth lens has negative refractive power, which is conducive to diverging light rays, allowing the subsequent optical system to have a larger light acceptance surface, improving optical performance, and effectively correcting various aberrations caused by the front lens to improve the imaging quality of the optical lens.

[0075] In some embodiments, the sixth lens has negative refractive power, which is conducive to diverging light rays, allowing peripheral light rays and central light rays to be turned upward to reach a higher imaging position, thereby increasing the imaging area of the optical lens.

[0076] In some embodiments, the optical lens can further include a diaphragm, which can be located between the first lens and the third lens. It can be understood that the diaphragm is used to limit the amount of light entering to change the brightness of the image. When the diaphragm is located between the first lens and the third lens, it is conducive to effectively converging the light entering the optical lens, reducing the lens aperture at 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 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.

[0077] In some embodiments, the optical lens can further include a filter and / or protective glass arranged between the sixth lens and the imaging surface, which can filter light with different wavelengths to prevent damage to the image side elements (e.g., chips) of the optical lens.

[0078] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.9 < 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.

[0079] In some embodiments, 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. Satisfying the above range means that the optical distortion of the optical lens can be controlled within a small range, which is conducive to improving the imaging quality of the optical lens.

[0080] 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 angle satisfy: 0.55<IH / f<0.7. Satisfying the above range indicates that the optical lens can achieve a larger imaging surface, which is beneficial to improve the imaging quality of the optical lens.

[0081] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2<BFL / f<0.4. Satisfying the above range indicates 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.

[0082] In some embodiments, the real image height IH corresponding to the maximum field of view angle, the total optical length TTL of the optical lens, and the maximum field of view angle FOV satisfy: 64.0<180°xTTL / (IH / 2) / (FOV / 2)<80.0. Satisfying the above range can achieve a balance between large image height, long focal length, and miniaturization, thereby improving the imaging quality of the optical lens.

[0083] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy: 0.5<∑CT / TTL<0.85. Satisfying the above range is beneficial to compress the total length and volume of the optical lens, thereby maintaining the miniaturization of the optical lens.

[0084] In some embodiments, the maximum field of view angle FOV of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the object side light aperture D1 of the first lens satisfy: 3.2<D1 / IH / tan(FOV / 2)<4.2. Satisfying the above range can ensure that the front aperture size of the optical lens is balanced between the field of view angle and the image surface, thereby improving the imaging quality of the optical lens.

[0085] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f<-0.8. Satisfying the above range is beneficial to diverge light rays, and under the same field of view angle condition, the light rays emitted from the image side of the first lens can make the subsequent optical system have a larger light acceptance surface, thereby reducing the front aperture.

[0086] 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. Satisfying the above range is beneficial to converge light rays, and in combination with the first lens having negative optical power, the total length of the optical lens can be reduced, and the converging effect of the light rays can further reduce the rear aperture.

[0087] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8 < f3 / f < 2.3. Satisfying the above range is conducive to receiving light rays converged from the second lens, reducing the height of the light beam when incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0088] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < f4 / f < 1.3. Satisfying the above range is conducive to converging light rays, effectively correcting aberrations of the optical lens in cooperation with the fifth lens, improving imaging quality, and optimizing optical performance such as distortion.

[0089] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.9 < f5 / f < -0.5. Satisfying the above range is conducive to diverging light rays, allowing the subsequent optical system to have a larger light acceptance surface, improving optical performance, and effectively correcting various aberrations caused by the front lens to improve the imaging quality of the optical lens.

[0090] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -0.6. Satisfying the above range is conducive to diverging light rays, allowing peripheral light rays and central light rays to turn upward and reach a higher imaging position, thereby increasing the imaging area of the optical lens.

[0091] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R3 of the object side of the second lens satisfy: 0.9 < R3 / f < 2.8. Satisfying the above range can receive diverging light rays from the first lens, quickly converge the diverging light rays, avoid the diverging light rays from exiting the lens, and reduce light energy loss.

[0092] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side of the fourth lens satisfy: 0.4 < R7 / f < 1.0. Satisfying the above range can compress light rays to smoothly enter the fifth lens, reduce the sensitivity of the optical lens, and also allow the light rays to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0093] In some embodiments, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side satisfy: 1.10 < |(R1-R2) / (R1+R2)|. Satisfying the above range can diverge large-angle light rays passing through the first lens, which is conducive to correcting large-angle light ray aberrations in the rear optical system and improving the imaging quality of the optical lens.

[0094] In some embodiments, the fourth lens and the fifth lens can be bonded to form a bonded lens, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens; and can also reduce assembly sensitivity of the optical lens, thereby reducing processing difficulty of the optical lens and improving assembly yield of the optical lens.

[0095] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures 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.

[0096] In various embodiments of the present application, when the lenses are aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0097]

[0098] 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.

[0099] The present application will be 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, 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.

[0100] Embodiment 1

[0101] Please refer to Figure 1 , which is a structural schematic diagram of an optical lens provided in embodiment 1 of the present application. The optical lens includes, in order from the object side to the imaging surface along the optical axis, 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.

[0102] The first lens L1 has negative focal power, and both the object side S1 and the image side S2 are concave surfaces; the second lens L2 has positive focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface; the third lens L3 has positive focal power, and both the object side S5 and the image side S6 are convex surfaces; the fourth lens L4 has positive focal power, and both the object side S7 and the image side S8 are convex surfaces; the fifth lens L5 has negative focal power, and both the object side S8 and the image side S9 are concave surfaces, 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 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.

[0103] S14 is a flat surface.

[0104] 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.

[0105] 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.

[0106] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0107] Table 1-1

[0108]

[0109]

[0110] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0111] Table 1-2

[0112] Surface number K A B C D E F S3 -5.05E+00 0.00E+00 0.00E+00 -5.70E-06 2.65E-07 -7.49E-09 7.69E-11 S4 1.46E+01 0.00E+00 0.00E+00 -1.25E-06 4.18E-08 -7.93E-10 5.92E-12 S10 -3.77E+00 0.00E+00 -2.21E-03 4.28E-05 -6.47E-06 3.86E-07 -6.69E-09 S11 -1.84E+00 0.00E+00 -2.24E-03 6.70E-05 -6.21E-06 3.69E-07 -6.48E-09

[0113] 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 in 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 both low and high frequency cases.

[0114] Embodiment 2

[0115] Please refer to Figure 3The figure shown is a schematic diagram of the optical lens provided in Embodiment 2 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.

[0116] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0117] Table 2-1

[0118]

[0119]

[0120] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0121] Table 2-2

[0122] Surface number K A B C D E F S3 -5.37E+00 0.00E+00 0.00E+00 -5.80E-06 2.64E-07 -7.37E-09 7.31E-11 S4 1.19E+01 0.00E+00 0.00E+00 -7.91E-07 4.04E-08 -8.89E-10 8.18E-12 S10 -7.44E-01 0.00E+00 1.87E-03 -5.82E-05 6.74E-06 -3.40E-07 5.70E-09 S11 -5.50E+00 0.00E+00 1.67E-03 -5.41E-05 7.46E-06 -3.40E-07 5.31E-09

[0123] from Figure 4 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.

[0124] Example 3

[0125] Please see Figure 5 The figure shown is a schematic diagram of the optical lens provided in Embodiment 3 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.

[0126] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0127] Table 3-1

[0128]

[0129]

[0130] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0131] Table 3-2

[0132] Surface number K A B C D E F S3 -3.39E+00 0.00E+00 0.00E+00 -5.79E-06 2.48E-07 -7.42E-09 7.54E-11 S4 1.69E+01 0.00E+00 0.00E+00 -1.43E-06 2.56E-08 -7.33E-10 6.07E-12 S10 -5.67E-01 0.00E+00 1.65E-03 -5.02E-05 6.62E-06 -3.40E-07 5.78E-09 S11 -4.84E+00 0.00E+00 1.67E-03 -5.18E-05 7.47E-06 -3.44E-07 5.46E-09

[0133] from Figure 6As 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.

[0134] Example 4

[0135] Please see Figure 7 The figure shown is a schematic diagram of the optical lens provided in Embodiment 4 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.

[0136] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0137] Table 4-1

[0138]

[0139] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0140] Table 4-2

[0141]

[0142]

[0143] from Figure 8 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 5

[0145] 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.

[0146] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0147] Table 5-1

[0148]

[0149] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0150] Table 5-2

[0151] Surface 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

[0152] As can be seen from Figure 10 , the MTF value of the optical lens provided in 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.

[0153] Embodiment 6

[0154] Referring to Figure 11 , a structural schematic diagram of an optical lens provided in Embodiment 6 of the present application is shown, and 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.

[0155] The related parameters of each lens in the optical lens in Embodiment 6 are shown in Table 6-1.

[0156] Table 6-1

[0157]

[0158] The surface type parameters of the aspherical lens of the optical lens in Embodiment 6 are shown in Table 6-2.

[0159] Table 6-2

[0160] Surface 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

[0161] As can be seen from Figure 12 , the MTF value of the optical lens provided in 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.

[0162] Embodiment 7

[0163] Referring to Figure 13 , a structural schematic diagram of an optical lens provided in Embodiment 7 of the present application is shown, and 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.

[0164] The related parameters of each lens in the optical lens in Embodiment 7 are shown in Table 7-1.

[0165] Table 7-1

[0166]

[0167] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 7 are shown in Table 7-2.

[0168] Table 7-2

[0169] Surface 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 S11 -8.00E+01 0.00E+00 -1.24E-03 -4.39E-05 6.84E-06 -2.48E-07 3.43E-09 S12 3.45E+01 0.00E+00 -1.05E-03 -5.34E-05 7.80E-06 -2.77E-07 3.66E-09

[0170] It can be seen from Figure 14 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 good imaging quality and good detail resolution ability in low and high frequency cases.

[0171] Embodiment 8

[0172] Referring to Figure 15 , a structure schematic diagram of the optical lens provided in Embodiment 8 of the present application is shown, and 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.

[0173] The related parameters of each lens in the optical lens in Embodiment 8 are shown in Table 8-1.

[0174] Table 8-1

[0175]

[0176] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 8 are shown in Table 8-2.

[0177] Table 8-2

[0178] Surface 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 S11 8.00E+01 0.00E+00 -1.34E-03 -3.89E-05 6.85E-06 -2.51E-07 3.36E-09 S12 -8.00E+01 0.00E+00 -7.81E-04 -4.47E-05 7.88E-06 -2.86E-07 4.13E-09

[0179] It can be seen from Figure 16 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 good imaging quality and good detail resolution ability in low and high frequency cases.

[0180] Embodiment 9

[0181] Referring to Figure 17 , a structure schematic diagram of the optical lens provided in Embodiment 9 of the present application is shown, and 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.

[0182] The related parameters of each lens in the optical lens in Embodiment 9 are shown in Table 9-1.

[0183] Table 9-1

[0184]

[0185]

[0186] The surface profile parameters of the aspherical lens of the optical lens in Example 9 are shown in Table 9-2.

[0187] Table 9-2

[0188] Surface number K A B C D E F S3 -4.55E+00 0.00E+00 0.00E+00 -5.68E-06 2.70E-07 -7.37E-09 7.13E-11 S4 1.97E+01 0.00E+00 0.00E+00 -1.19E-06 4.08E-08 -8.22E-10 5.81E-12 S10 -9.02E-01 0.00E+00 -1.85E-03 3.53E-05 -7.26E-06 3.68E-07 -5.50E-09 S11 -6.85E-01 0.00E+00 -1.72E-03 3.07E-05 -6.49E-06 3.94E-07 -6.45E-09

[0189] As can be seen from Figure 18 , 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 good imaging quality and good detail resolution ability in both low and high frequency cases.

[0190] Example 10

[0191] Referring to Figure 19 , a structural schematic diagram of the optical lens provided in Example 10 of the present application is shown, and the present embodiment mainly differs from Example 1 in that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0192] The related parameters of the lenses in the optical lens in Example 10 are shown in Table 10-1.

[0193] Table 10-1

[0194]

[0195]

[0196] The surface profile parameters of the aspherical lens of the optical lens in Example 10 are shown in Table 10-2.

[0197] Table 10-2

[0198] Surface number K A B C D E F S3 -5.01E+01 0.00E+00 0.00E+00 -5.07E-06 2.82E-07 -4.83E-09 3.41E-11 S4 -5.00E+01 0.00E+00 0.00E+00 1.70E-06 6.25E-08 2.15E-10 1.25E-11 S10 9.51E+00 0.00E+00 -1.71E-03 2.47E-05 5.76E-06 -2.94E-07 4.63E-09 S11 6.47E+01 0.00E+00 -1.39E-03 1.37E-05 5.77E-06 -2.67E-07 4.09E-09

[0199] As can be seen from Figure 20 , 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.

[0200] Example 11

[0201] Referring to Figure 21Figure 11 shows a structural schematic diagram of an optical lens provided in Embodiment 11 of the present application. Compared with Embodiment 1, the main difference of the present embodiment lies in that the optical parameters such as the radius of curvature of each lens surface and the thickness of the lens are different.

[0202] The related parameters of each lens in the optical lens in Embodiment 11 are shown in Table 11-1.

[0203] Table 11-1

[0204]

[0205]

[0206] The surface type parameters of the aspherical lens of the optical lens in Embodiment 11 are shown in Table 11-2.

[0207] Table 11-2

[0208] Surface number K A B C D E F S3 -1.54E+01 0.00E+00 0.00E+00 -4.22E-06 1.24E-07 -1.12E-09 -1.35E-11 S4 -3.64E+01 0.00E+00 0.00E+00 5.47E-07 1.51E-08 1.41E-09 -1.73E-11 S10 9.28E+00 0.00E+00 -2.01E-03 1.09E-04 -4.15E-07 -8.36E-08 1.97E-09 S11 7.29E+01 0.00E+00 -1.96E-03 1.03E-04 -6.81E-07 -5.59E-08 1.26E-09

[0209] It can be seen from Figure 22 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 in the case of low frequency and high frequency, it has qualified imaging quality and qualified detail resolution capability.

[0210] Embodiment 12

[0211] Please refer to Figure 23 Figure 12 shows a structural schematic diagram of an optical lens provided in Embodiment 12 of the present application. Compared with Embodiment 1, the main difference of the present embodiment lies in that the optical parameters such as the radius of curvature of each lens surface and the thickness of the lens are different.

[0212] The related parameters of each lens in the optical lens in Embodiment 12 are shown in Table 12-1.

[0213] Table 12-1

[0214]

[0215] The surface type parameters of the aspherical lens of the optical lens in Embodiment 12 are shown in Table 12-2.

[0216] Table 12-2

[0217] Surface number K A B C D E F S3 -4.76E+00 0.00E+00 0.00E+00 -5.02E-06 8.57E-08 -1.77E-09 -1.11E-11 S4 5.00E+01 0.00E+00 0.00E+00 -9.94E-07 -3.22E-08 4.89E-10 -3.21E-12 S10 7.85E+00 0.00E+00 -1.39E-03 9.71E-07 -1.58E-06 8.04E-09 1.00E-09 S11 2.49E+00 0.00E+00 -1.18E-03 -1.18E-06 -1.00E-06 2.14E-08 3.49E-10

[0218] It can be seen from Figure 24As 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.

[0219] Example 13

[0220] Please see Figure 25 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 13 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.

[0221] The relevant parameters of each lens in the optical lens of Example 13 are shown in Table 13-1.

[0222] Table 13-1

[0223]

[0224] The surface profile parameters of the aspherical lens in the optical lens of Example 13 are shown in Table 13-2.

[0225] Table 13-2

[0226]

[0227]

[0228] from Figure 26 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.

[0229] Example 14

[0230] Please see Figure 27 The figure shown is a schematic diagram of the optical lens provided in Embodiment 14 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is the setting of aspherical lenses, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0231] The relevant parameters of each lens in the optical lens of Example 14 are shown in Table 14-1.

[0232] Table 14-1

[0233]

[0234] The surface profile parameters of the aspherical lens in the optical lens of Example 14 are shown in Table 14-2.

[0235] Table 14-2

[0236] Surface number K A B C D E F S1 1.92E-01 0.00E+00 -4.44E-05 8.60E-07 -6.58E-08 3.09E-09 -4.58E-11 S2 6.84E+01 0.00E+00 3.30E-05 -2.97E-08 1.63E-08 -6.15E-12 -4.14E-12 S10 -1.35E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -5.28E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0237] As can be seen from Figure 28 , the MTF value of the optical lens provided in the embodiment is above 0.4 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.

[0238] Embodiment 15

[0239] Please refer to Figure 29 , which is a structural schematic diagram of the optical lens provided in the embodiment 15 of the present application, 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.

[0240] The related parameters of each lens in the optical lens in the embodiment 15 are shown in Table 15-1.

[0241] Table 15-1

[0242]

[0243] The surface type parameters of the aspherical lens of the optical lens in the embodiment 15 are shown in Table 15-2.

[0244] Table 15-2

[0245] Surface number K A B C D E F S3 6.35E+00 0.00E+00 -8.17E-06 2.66E-07 7.33E-08 -1.67E-09 2.44E-11 S4 -2.60E+00 0.00E+00 4.18E-05 -2.90E-07 1.49E-07 -4.02E-09 6.10E-11 S10 1.72E+01 0.00E+00 -4.92E-03 1.62E-04 -5.97E-06 1.99E-07 -3.07E-09 S11 2.69E+00 0.00E+00 -5.09E-03 1.93E-04 -8.90E-06 2.78E-07 -4.30E-09

[0246] As can be seen from Figure 30 , the MTF value of the optical lens provided in the embodiment is above 0.5 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 excellent imaging quality and excellent detail resolution ability in the case of low frequency and high frequency.

[0247] Please refer to Table 16, which is the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH and the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0248] Table 16

[0249]

[0250] Table 16 (continued)

[0251]

[0252]

[0253] Table 16

[0254]

[0255]

[0256] In summary, the optical lens provided by the present application optimizes the shape, focal length, thickness and spacing of each lens, improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, etc.

[0257] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0258] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are 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 surface along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, both the object side surface and the image side surface of which are concave; a second lens with positive refractive power, the object side surface of which is convex; a third lens with positive refractive power; a fourth lens with positive refractive power, the object side surface of which is convex; a fifth lens with negative refractive power; a sixth lens with negative refractive power; the effective focal length f of the optical lens and the total track length TTL satisfy: 1.9 < TTL / f < 2.5; the object side surface curvature radius R1 and the image side surface curvature radius R2 of the first lens satisfy: 1.10 < |(R1-R2) / (R1+R2)|; the real image height IH corresponding to the maximum field angle of the optical lens, the total track length TTL and the maximum field angle FOV satisfy: 64.0 < 180°×TTL / (IH / 2) / (FOV / 2) < 80.

0.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the total track length TTL satisfy: 1.99 ≤ TTL / f ≤ 2.

37.

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 angle 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 angle of the optical lens, the total track length TTL and the maximum field angle FOV satisfy: 66.03 ≤ 180°×TTL / (IH / 2) / (FOV / 2) ≤ 77.

54.

6. The optical lens of claim 1, wherein, The sum ∑CT of the central 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.

85.

7. The optical lens of claim 1, wherein, The maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle and the object side surface light aperture D1 of the first lens satisfy: 3.2 < D1 / IH / tan(FOV / 2) < 4.

2.

8. The optical lens of claim 1, wherein, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.61 ≤ f1 / f < -0.

8.

9. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f2 / f ≤ 3.

66.

10. 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: -6.67 ≤ f6 / f < -0.

6.

11. The optical lens of claim 1, wherein, The object side surface curvature radius R1 and the image side surface curvature radius R2 of the first lens satisfy: 1.19 ≤ |(R1-R2) / (R1+R2)| ≤ 7.71.

Images