Optical lens

Abstract

The utility model discloses an optical lens. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along an optical axis from an object side to an image side, the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the fourth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a plane; the sixth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; wherein the total length TTL of an optical system of the optical lens and the entrance pupil diameter ENPD meet the condition that ENPD / TTL is greater than or equal to 0.1. The optical lens provided by the utility model has the characteristics of high imaging definition, small volume and large aperture.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of optical devices, and in particular to an optical lens. Background Art

[0002] With technological advancements, optical lenses are widely used in various fields, and the performance requirements for optical lenses in these fields are becoming increasingly higher. For example, when optical lenses are used in the field of assisted driving, to ensure driving safety and stability, the assisted driving system requires an optical lens with a high resolution to capture high-definition images as the basis for assisted driving.

[0003] However, existing optical lenses cannot combine the characteristics of high resolution, large aperture, small size and high imaging clarity, which limits the application scenarios of existing optical lenses. Utility Model Content

[0004] The utility model provides an optical lens, which satisfies the requirements of large aperture and small volume while ensuring the optical lens has high resolution and high imaging clarity.

[0005] The utility model provides an optical lens, which comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence along the optical axis from the object side to the image side;

[0006] The first lens has negative optical power, and the object-side surface of the first lens is convex and the image-side surface is concave;

[0007] The second lens has positive refractive power, and the object-side surface of the second lens is concave and the image-side surface is convex;

[0008] The third lens has positive refractive power, and the object-side surface and the image-side surface of the third lens are convex;

[0009] The fourth lens has positive refractive power, and the object-side surface and the image-side surface of the fourth lens are convex;

[0010] The fifth lens has negative optical power, and the object-side surface of the fifth lens is concave and the image-side surface is flat;

[0011] The sixth lens has positive refractive power, and the object-side surface of the sixth lens is convex and the image-side surface is concave;

[0012] The total length TTL of the optical system of the optical lens and the entrance pupil diameter ENPD satisfy the following relationship: ENPD / TTL≥0.1.

[0013] Optionally, the total optical system length TTL of the optical lens and the image height H of the optical lens at the maximum field of view satisfy the following relationship: 7<TTL / H<8.

[0014] Optionally, the focal length F of the optical lens and the total length TTL of the optical system of the optical lens satisfy the following relationship: TTL / F<4.5.

[0015] Optionally, the optical back focus BFL of the optical lens and the total length TTL of the optical system of the optical lens satisfy: BFL / TTL>0.4.

[0016] Optionally, the refractive index Nd1 of the first lens satisfies: Nd1 ≥ 1.7.

[0017] Optionally, the Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens satisfy: 3<Vd4 / Vd5<3.5;

[0018] A refractive index Nd4 of the fourth lens element and a refractive index Nd5 of the fifth lens element satisfy the following relationship: 0.8<Nd4 / Nd5<0.9.

[0019] Optionally, the focal lengths of the first lens to the sixth lens satisfy:

[0020] -2 <f1 / F<0;

[0021] 0<f2 / F<15;

[0022] 0<f3 / F<2;

[0023] 0<f4 / F<2;

[0024] -2 <f5 / F<0;

[0025] 0 <f6 / F<4.5;

[0026] Among them, F is the focal length value of the optical lens, f1 is the focal length value of the first lens, f2 is the focal length value of the second lens, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, f5 is the focal length value of the fifth lens, and f6 is the focal length value of the sixth lens.

[0027] Optionally, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the relationship: -1.5<f4 / f5<-0.5.

[0028] Optionally, a central curvature radius R1 of the object-side surface of the first lens, a central curvature radius R2 of the image-side surface of the first lens, and a central thickness d1 of the first lens satisfy the following relationship: 0.8≤R1 / (R2+d1)≤1.5.

[0029] Optionally, a central curvature radius R1 of the object-side surface of the first lens and a focal length F of the optical lens satisfy the relationship: 0.5<R1 / F<1.

[0030] Optionally, a central curvature radius R3 of the object-side surface of the second lens, a central curvature radius R4 of the image-side surface of the second lens, and a central thickness d2 of the second lens satisfy the following relationship: 0.8≤R3 / (R4+d2)≤1.5.

[0031] Optionally, a central curvature radius R8 of the object-side surface of the fourth lens and a focal length F of the optical lens satisfy the relationship: 1<R8 / F<1.5.

[0032] Optionally, a central curvature radius R11 of the image surface of the sixth lens and a focal length F of the optical lens satisfy the following relationship: 1<R11 / F<1.5.

[0033] Optionally, the fourth lens and the fifth lens form a cemented lens.

[0034] Optionally, the focal length f45 of the cemented lens formed by the fourth lens and the fifth lens satisfies the following relationship with the focal length F of the optical lens: 5≤|f45 / F|≤8.

[0035] Optionally, the optical lens further includes: an aperture; the aperture is located in the optical path between the third lens and the fourth lens.

[0036] The technical solution of the utility model adopts seven lenses with optical power to form an optical lens, reasonably distributes the optical power of each lens, and sets the total optical system length TTL and entrance pupil diameter ENPD of the optical lens to meet TTL / ENPD≤13. This enables the optical lens to have a high imaging resolution while meeting the requirements of a small volume and a large aperture, thereby broadening the application field of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of an optical lens provided by the utility model;

[0038] Figure 2 yes Figure 1 Schematic diagram of the light fan of the optical lens shown;

[0039] Figure 3 yes Figure 1 Schematic diagram of the axial aberration curve of the optical lens shown;

[0040] Figure 4 yes Figure 1 Schematic diagram of field curvature distortion curve of the optical lens shown;

[0041] Figure 5 A schematic structural diagram of another optical lens provided by the present invention;

[0042] Figure 6 yes Figure 5 Schematic diagram of the light fan of the optical lens shown;

[0043] Figure 7 yes Figure 5 Schematic diagram of the axial aberration curve of the optical lens shown;

[0044] Figure 8 yes Figure 5 Schematic diagram of field curvature distortion curve of the optical lens shown;

[0045] Figure 9 A schematic structural diagram of another optical lens provided by the present invention;

[0046] Figure 10 yes Figure 9 Schematic diagram of the light fan of the optical lens shown;

[0047] Figure 11 yes Figure 9 Schematic diagram of the axial aberration curve of the optical lens shown;

[0048] Figure 12 yes Figure 9 Schematic diagram of the field curvature distortion curve of the optical lens shown. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be fully described below in conjunction with the drawings in the embodiments of the present invention through specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention, which is obvious to those skilled in the art. Therefore, the present invention is intended to cover modifications and changes of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents.

[0050] Furthermore, the words “first”, “second” and similar terms used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “one”, “an” or “the” do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as “include” or “comprise” mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, descriptions such as “same” and “equal” involved in the embodiments of the present disclosure do not mean that the two objects are exactly the same in size or shape. Approximately the same or approximately equal within a certain error range is allowed.

[0051] It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other if there is no contradiction.

[0052] Figure 1 This is a schematic diagram of the structure of an optical lens provided by an embodiment of the present utility model. Figure 1 As shown, the optical lens includes: a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50 and a sixth lens 60 arranged in sequence along the optical axis from the object side to the image side; the first lens 10 has a negative optical focal power; the second lens 20 has a positive optical focal power; the third lens 30 has a positive optical focal power; the fourth lens 40 has a positive optical focal power; the fifth lens 50 has a negative optical focal power; and the sixth lens 60 has a positive optical focal power.

[0053] It can be understood that the optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, and it characterizes the ability of an optical system to deflect light. The larger the absolute value of the optical power, the stronger the ability to bend light, and the smaller the absolute value of the optical power, the weaker the ability to bend light. When the optical power is a positive number, the refraction of light is convergent; when the optical power is a negative number, the refraction of light is divergent. The optical power can be used to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a certain lens, and can also be used to characterize a system formed by multiple lenses (i.e., a lens group).

[0054] In this embodiment, each of the first lens 10 to the sixth lens 60 can be fixed to a lens barrel ( Figure 1(not shown in the figure), by setting the first lens 10 to have a negative optical power, the optical lens has a larger field of view angle; setting the second lens 20 to have a positive optical power, thereby correcting the spherical aberration and coma of the light passing through the first lens 10, improving the clarity and resolution of the image; setting the third lens 30 to have a positive optical power, which facilitates a smoother passage of light through the system, facilitates the correction of field curvature and astigmatism, and improves the clarity and quality of the image; setting the fourth lens 40 to have a positive optical power and the fifth lens 50 to have a negative optical power, which facilitates a smoother passage of light through the optical system of the optical lens, while also increasing the imaging area of ​​the optical lens and improving the clarity and quality of the image; setting the sixth lens 60 to have a positive optical power, which helps to balance the various aberrations generated by the fifth lens 50 and improve the imaging quality of the optical system of the optical lens. In this way, by using six lenses with optical powers to form the optical lens and rationally allocating the optical powers of each lens, the optical lens can achieve high imaging resolution while also having the characteristics of a large aperture and a small size.

[0055] Optionally, the object side surface of the first lens 10 is convex and the image side surface is concave; the object side surface of the second lens 20 is concave and the image side surface is convex; the object side surface of the third lens 30 is convex and the image side surface is convex; the object side surface of the fourth lens 40 is convex and the image side surface is convex; the object side surface of the fifth lens 50 is concave and the image side surface is flat; the object side surface of the sixth lens 60 is convex and the image side surface is concave.

[0056] The object-side surface of a lens can be understood as the surface of the lens closest to the object plane, and the image-side surface of a lens can be understood as the surface of the lens closest to the image plane. In this embodiment, by rationally arranging the shapes of each lens, the requirements for miniaturization and large aperture of the optical lens are met while ensuring clear imaging quality, allowing the optical lens to be applied in a wider range of application scenarios. Furthermore, the image-side surface of the fifth lens 50 is flat, which facilitates assembly between lenses and reduces assembly sensitivity.

[0057] Optionally, the total optical length TTL of the optical lens and the entrance pupil diameter ENPD satisfy the following relationship: ENPD / TTL ≥ 0.1. This setting is conducive to achieving a large aperture characteristic and providing more incident light for the optical lens.

[0058] Optionally, the total optical system length (TTL) of the optical lens and the image height (H) of the optical lens at the maximum field of view satisfy the following relationship: 7 < TTL / H < 8. This configuration can achieve a large image area while further compressing the total length of the optical lens, enabling a miniaturized design of the optical lens and facilitating its installation on other imaging devices.

[0059] Optionally, the relationship between the focal length value F of the optical lens and the total optical system length TTL of the optical lens satisfies: TTL / F < 4.5. With such a setting, the total optical system length of the optical lens can be better controlled, and a miniaturized optical lens can be obtained.

[0060] Optionally, the relationship between the back focal length BFL of the optical lens and the total optical system length TTL of the optical lens satisfies: BFL / TTL > 0.4. With such a setting, on the basis of achieving miniaturization, it is beneficial to have a longer back focal length, which is conducive to the assembly of each module in the optical lens.

[0061] Optionally, the refractive index Nd1 of the first lens 10 satisfies: Nd1 ≥ 1.7, that is, the material of the first lens 10 is preferably a high refractive index material, which is beneficial to a smaller front aperture and is beneficial to the improvement of imaging quality.

[0062] Optionally, the relationship between the Abbe number Vd4 of the fourth lens 40 and the Abbe number Vd5 of the fifth lens 50 satisfies: 3 < Vd4 / Vd5 < 3.5; the relationship between the refractive index Nd4 of the fourth lens 40 and the refractive index Nd5 of the fifth lens 50 satisfies: 0.8 < Nd4 / Nd5 < 0.9. In this way, the fourth lens 40 and the fifth lens 50 can have a large difference in Abbe number and refractive index, which is more conducive to the elimination of chromatic aberration.

[0063] Optionally, the focal length values of the first lens 10 to the sixth lens 60 satisfy: -2 < f1 / F < 0; 0 < f2 / F < 15; 0 < f3 / F < 2; 0 < f4 / F < 2; -2 < f5 / F < 0; 0 < f6 / F < 4.5; where F is the focal length value of the optical lens, f1 is the focal length value of the first lens 10, f2 is the focal length value of the second lens 20, f3 is the focal length value of the third lens 30, f4 is the focal length value of the fourth lens 40, f5 is the focal length value of the fifth lens 50, and f6 is the focal length value of the sixth lens 60.

[0064] Among them, by setting the ratio of the focal length value f1 of the first lens 10 to the focal length value F of the optical lens to be greater than -2 and less than 0, that is, the first lens 10 has an appropriate negative optical focal length, which is beneficial to expanding the field of view angle of the optical lens; by setting the ratio of the focal length value f2 of the second lens 20 to the focal length value F of the optical lens to be greater than 0 and less than 15, that is, the second lens 20 has an appropriate positive optical focal length, the second lens can converge the light and make the light transition smoothly to the rear; by setting the ratio of the focal length value f of the third lens 30 to the focal length value F of the optical lens to be greater than 0 and less than 15, that is, the ratio of the focal length value f3 of the third lens 30 to the focal length value F of the optical lens is set to be greater than 0 and less than 2, that is, the third lens 30 has an appropriate positive optical focal length, which is beneficial to the smooth transition of light, facilitates the correction of astigmatism and field curvature, and improves the imaging quality of the optical lens. quality; by setting the ratio of the focal length value of the fourth lens 40 to the focal length value F of the optical lens to be greater than 0 and less than 2, that is, reasonably setting the focal length of the fourth lens 40, the optical power of the entire optical system can be reasonably distributed, which is conducive to achieving temperature characteristics and ensuring that the optical lens can still ensure good imaging quality under high and low temperature conditions; by setting the ratio of the focal length value of the fifth lens 50 to the focal length value F of the optical lens to be greater than -2 and less than 0, that is, the fifth lens 50 has an appropriate negative optical power, which is conducive to increasing the imaging area of ​​the optical lens, balancing the aberration, and improving the imaging quality of the optical lens; by setting the ratio of the focal length value of the sixth lens 60 to the focal length value F of the optical lens to be greater than 0 and less than 4.5, that is, the sixth lens 60 has a shorter focal length, which is conducive to collecting light, ensuring the amount of light transmitted, and improving the relative illumination, so that the brightness of the optical lens at the image plane is improved.

[0065] Optionally, the fourth lens 40 and the fifth lens 50 form a cemented lens.

[0066] By forming a cemented lens with the fourth lens 40 and the fifth lens 50, the air gap between the fourth lens 40 and the fifth lens 50 can be reduced, thereby helping to reduce the overall length of the optical lens. Simultaneously, the cemented lens can minimize or eliminate chromatic aberration, allowing the various aberrations of the optical lens to be fully corrected. While maintaining a compact structure, it can improve resolution, optimize optical properties such as distortion, reduce light loss caused by reflections between the lenses, and increase illumination, thereby improving image quality and enhancing the clarity of the optical lens. Furthermore, the use of a cemented lens can reduce the number of components between the two lenses, simplify the assembly process during the optical lens manufacturing process, reduce costs, and reduce the sensitivity to tolerances such as tilt and deflection that occur during the lens unit assembly process.

[0067] Optionally, the focal length f4 of the fourth lens element 40 and the focal length f5 of the fifth lens element 50 satisfy the following relationship: -1.5 < f4 / f5 < -0.5. Thus, by setting the focal length ratio of the cemented lens (fourth lens element 40 with positive optical power and fifth lens element 50 with negative optical power) to be greater than -1.5 and less than -0.5, chromatic aberration can be eliminated.

[0068] Optionally, the focal length f45 of the cemented lens formed by the fourth lens 40 and the fifth lens 50 and the focal length F of the optical lens satisfy the following relationship: 5≤|f45 / F|≤8.

[0069] Among them, by making the absolute value of the ratio of the overall focal length value f45 of the cemented lens composed of the fourth lens 40 and the fifth lens 50 to the focal length value F of the optical lens greater than or equal to 5 and less than or equal to 8, the light trend between the fourth lens 40 and the fifth lens 50 can be controlled, the aberration caused by the large angle can be reduced, and the structure of the lens can be made compact, which is conducive to miniaturization and reduced sensitivity.

[0070] Optionally, the central radius of curvature R1 of the object-side surface of the first lens 10, the central radius of curvature R2 of the image-side surface of the first lens 10, and the central thickness d1 of the first lens 10 satisfy the following relationship: 0.8 ≤ R1 / (R2 + d1) ≤ 1.5. This configuration allows the shape of the first lens 10 to approximate concentric circles, resulting in an optical path difference between the peripheral and central rays, thus diverging the central ray. This also facilitates reducing the front diameter of the optical lens, reducing the size of the optical lens, and promoting miniaturization and low cost.

[0071] Optionally, the central radius of curvature R1 of the object-side surface of the first lens 10 and the focal length F of the optical lens satisfy the following relationship: 0.5 < R1 / F < 1. Thus, by setting the lower limit of the ratio between the central radius of curvature R1 of the object-side surface of the first lens 10 and the focal length F of the optical lens to 0.5, the field of view of the optical lens is increased, thereby meeting the requirements of wide-range photography. By setting the upper limit of the ratio between the central radius of curvature R1 of the object-side surface of the first lens 10 and the focal length F of the optical lens to 1, the effective aperture of the first lens 10 is reduced, thereby facilitating miniaturization of the optical lens.

[0072] Optionally, the central curvature radius R3 of the object-side surface of the second lens 20, the central curvature radius R4 of the image-side surface of the second lens 20, and the central thickness d2 of the second lens 20 satisfy the following relationship: 0.8≤R3 / (R4+d2)≤1.5. This configuration allows the shape of the second lens 20 to approximate a concentric circle, resulting in an optical path difference between the peripheral and central rays, thus diverging the central ray. This also helps reduce the front diameter of the optical lens, reducing the size of the optical lens, and promoting miniaturization and low cost.

[0073] Optionally, a central curvature radius R8 of the object-side surface of the fourth lens 40 and a focal length F of the optical lens satisfy the relationship: 1<R8 / F<1.5.

[0074] Optionally, the central curvature radius R11 of the image surface of the sixth lens 60 and the focal length F of the optical lens satisfy the relationship: 1<R11 / F<1.5.

[0075] Among them, by making the ratio of the central curvature radius R8 of the object side surface of the fourth lens 40 to the focal length value F of the optical lens greater than 1 and less than 1.5, the ratio of the central curvature radius R11 of the image surface of the sixth lens 60 to the focal length value F of the optical lens is also greater than 1 and less than 1.5, so that the central curvature radius R8 of the object side surface of the fourth lens 40 and the central curvature radius R11 of the image surface of the sixth lens 60 can have the same value orientation, thereby changing the relative position of the pupil image of the secondary reflected ghost image of the object side surfaces of the fourth lens 40 and the sixth lens 60 on the focal plane, and making the pupil image of the ghost image away from the focal plane, effectively reducing the relative energy value of the ghost image, and improving the quality of the imaging picture of the optical lens.

[0076] Optionally, the optical lens further includes: an aperture 70 ; the aperture 70 is located in the optical path between the third lens 30 and the fourth lens 40 .

[0077] Specifically, the aperture 70 can adjust the propagation direction of the light beam, which is beneficial for improving imaging quality. The aperture 70 is located in the optical path between the third lens 30 and the fourth lens 40. The aperture 70 can be set near the image-side surface of the third lens 30. It can reduce the generation of optical lens astigmatism and help to focus the light entering the optical system, reducing the diameter of the optical lens rear port.

[0078] Optionally, the optical lens further includes: a filter 80, which is arranged in the light path between the sixth lens 60 and the image plane to filter out stray light and improve the imaging effect. In an exemplary embodiment, the filter 80 can be an infrared filter.

[0079] In summary, the embodiment of the present invention utilizes six lenses having different optical powers to form an optical lens, rationally distributes the optical powers of the lenses, and rationally selects materials and designs the shapes of the lenses, thereby enabling the optical lens to simultaneously meet the requirements of small size, large aperture, high resolution, and high resolution. The optical lens can have a high presentation clarity, which is conducive to broadening the application field of optical lenses.

[0080] Specific embodiments of the optical lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0081] In a feasible embodiment, Table 1 details the following in a feasible implementation manner: Figure 1The specific optical physical parameters of the optical lens are shown.

[0082] Table 1 Optical physical parameter design of an optical lens

[0083] Example 1 Lower limit Upper limit TTL / H 7.244 7.000 8 TTL / F 4.169 4.5 BFL / F 0.421 0.400 ENPD / TTL 0.148 0.100 f1 / F -1.691 -2.000 0 f2 / F 14.182 0.000 15 f3 / F 1.545 0.000 2 f4 / F 0.993 0.000 2 f5 / F -1.108 -2.000 0 f6 / F 4.376 0.000 4.5 f4 / f5 -0.897 -1.500 -0.5 |F45 / F| 5.079 5.000 8 R1 / (R2+d1) 1.040 0.800 1.5 R3 / (R4+d2) 1.454 0.800 1.5 R1 / F 0.814 0.500 1 R8 / F 1.342 1.000 1.5 R11 / F 1.399 1.000 1.5 Vd4 / Vd5 2.881 3.000 3.5 Nd4 / Nd5 0.863 0.800 0.9

[0084] Table 2 shows the design parameters of the surface type, curvature radius, thickness and material of each lens in an optical lens corresponding to Table 1.

[0085] Table 2 Parameter design of each lens in the optical lens

[0086] Surface number Surface type Radius of curvature thickness Materials (nd) Material (vd) 1 Aspheric 5.70 2.65 1.806 40.91 2 Aspheric 2.83 3.06 3 spherical surface -8.93 3.40 1.871 40.73 4 spherical surface -9.54 0.38 5 spherical surface 9.92 6.50 1.729 54.68 6 spherical surface -28.54 0.08 STO (aperture) PL Infinity 1.70 8 spherical surface 9.40 2.60 1.593 68.53 9 spherical surface -6.63 2.30 1.847 23.78 10 spherical surface Infinity 0.60 11 Aspheric 9.80 3.00 1.690 52.81 12 Aspheric 15.91 0.60 13 spherical surface Infinity 0.30 1.517 64.20 14 spherical surface Infinity 1.50 15 spherical surface Infinity 0.50 1.517 64.20 16 spherical surface Infinity 0.05 IMA Infinity /

[0087] The optical lens of this embodiment includes a first lens 10, a second lens 20, a third lens 30, an aperture 70, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a filter glass 80, arranged sequentially along the optical axis from the object side to the image side. The surface numbers are numbered according to the order of the surfaces of the lenses, where "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface is curved toward the image side, and a negative value indicating that the surface is curved toward the object side. "Infinity" represents that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air.

[0088] In the optical lens of this embodiment, the first lens element 10 and the sixth lens element 60 are aspherical lenses. The object-side surface S1 and the image-side surface S2 of the first lens element 10 are both aspherical surfaces, and the object-side surface S11 and the image-side surface S12 of the sixth lens element 60 are both aspherical surfaces. The aspherical surface shape of this embodiment can be defined by the following aspherical surface formula, but is not limited to the following expression method:

[0089]

[0090] Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of y along the optical axis, c = 1 / R, R is the radius of curvature of the aspheric surface near the optical axis, k is the cone coefficient, A, B, C, D, E, F, and G correspond to the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order coefficients of the aspheric polynomial, respectively.

[0091] Table 3 Aspheric coefficients of an optical lens

[0092] Serial number K A B C D E F G S1 -1.70 -8.E-04 -8.E-05 2.E-06 1.E-08 -7.E-10 0.E+00 0.E+00 S2 -0.71 -4.E-03 -3.E-04 3.E-05 -9.E-07 -5.E-08 8.E-09 0.E+00 S11 3.31 -1.E-03 1.E-04 -1.E-05 4.E-07 6.E-09 0.E+00 2.E-11 S12 9.87 -4.E-03 3.E-04 -3.E-05 1.E-06 8.E-09 -2.E-09 0.E+00

[0093] Among them, -8.E-04 means that the coefficient A of the surface number S1 is -8×10 -4 .

[0094] Figure 2 yes Figure 1 The schematic diagram of the light fan of the optical lens is shown in Figure 2 As shown in the figure, the schematic diagrams of light fan at different field angles (0.00°, 10.00°, 16.00°, 20.00°, 30.00°, 40.00°, 45.00°, 50.00°) are respectively reflected. In the schematic diagram of light fan at each field angle, curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of optical lens imaging. Figure 2 It can be seen that the deviation of the light relative to the main light coordinate is controlled within ±25um, which shows that the optical lens can better control the aberration.

[0095] Figure 3 yes Figure 1 The schematic diagram of the axial aberration curve of the optical lens shown in FIG. Figure 3 As shown in the figure, the curves of different colors represent the different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of optical lens imaging. Figure 3 It can be seen that the offset of axial aberration is controlled within ±0.025mm, which shows that the optical lens can correct axial aberration well.

[0096] Figure 4 yes Figure 1 The schematic diagram of field curvature distortion of the optical lens is shown in Figure 4 As shown in the figure, the curves of different colors represent different wavelengths of system imaging (656nm, 588nm, 546nm, 486nm, 436nm). Figure 4 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.03mm, indicating that the optical lens can correct the field curvature well.

[0097] In another possible embodiment, Figure 5 This is a schematic diagram of the structure of another optical lens provided by an embodiment of the present invention. Table 4 describes in detail another feasible implementation method. Figure 5 The specific optical physical parameters of the optical lens are shown.

[0098] Table 4 Another optical physical parameter design of optical lens

[0099] Example 2 Lower limit Upper limit TTL / H 7.391 7.000 8 TTL / F 4.256 4.5 BFL / F 0.421 0.400 ENPD / TTL 0.145 0.100 f1 / F -1.692 -2.000 0 f2 / F 14.192 0.000 15 f3 / F 1.569 0.000 2 f4 / F 0.991 0.000 2 f5 / F -1.093 -2.000 0 f6 / F 4.308 0.000 4.5 f4 / f5 -0.907 -1.500 -0.5 |F45 / F| 5.114 5.000 8 R1 / (R2+d1) 1.040 0.800 1.5 R3 / (R4+d2) 1.454 0.800 1.5 R1 / F 0.814 0.500 1 R8 / F 1.343 1.000 1.5 R11 / F 1.410 1.000 1.5 Vd4 / Vd5 2.881 3.000 3.5 Nd4 / Nd5 0.863 0.800 0.9

[0100] Table 5 shows the design parameters of the surface type, curvature radius, thickness and material of each lens in another optical lens corresponding to Table 4.

[0101] Table 5 Another parameter design of each lens in the optical lens

[0102] Surface number Surface type Radius of curvature thickness Materials (nd) Material (vd) 1 Aspheric 5.70 2.65 1.806 40.91 2 Aspheric 2.83 3.06 3 spherical surface -8.93 3.40 1.871 40.73 4 spherical surface -9.54 0.55 5 spherical surface 9.95 7.00 1.729 54.68 6 spherical surface -29.45 0.08 STO (aperture) PL Infinity 1.42 8 spherical surface 9.40 2.80 1.593 68.53 9 spherical surface -6.54 2.30 1.847 23.78 10 spherical surface Infinity 0.60 11 Aspheric 9.87 3.00 1.690 52.81 12 Aspheric 16.37 0.60 13 spherical surface Infinity 0.30 1.517 64.20 14 spherical surface Infinity 1.50 15 spherical surface Infinity 0.50 1.517 64.20 16 spherical surface Infinity 0.05 IMA Infinity /

[0103] The optical lens of this embodiment includes a first lens 10, a second lens 20, a third lens 30, an aperture 70, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a filter glass 80, arranged sequentially along the optical axis from the object side to the image side. The surface numbers are numbered according to the order of the surfaces of the lenses, where "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface is curved toward the image side, and a negative value indicating that the surface is curved toward the object side. "Infinity" represents that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air.

[0104] In the optical lens of this embodiment, the first lens element 10 and the sixth lens element 60 are aspherical lenses. The object-side surface S1 and the image-side surface S2 of the first lens element 10 are both aspherical surfaces, and the object-side surface S11 and the image-side surface S12 of the sixth lens element 60 are both aspherical surfaces. The aspherical surface shape of this embodiment can be defined by the following aspherical surface formula, but is not limited to the following expression method:

[0105]

[0106] Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of y along the optical axis, c = 1 / R, R is the radius of curvature of the aspheric surface near the optical axis, k is the cone coefficient, A, B, C, D, E, F, and G correspond to the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order coefficients of the aspheric polynomial, respectively.

[0107] Table 6 Aspheric coefficients of another optical lens

[0108] Serial number K A B C D E F G S1 -1.8 -7.E-04 -7.E-05 2.E-06 2.E-08 -8.E-10 0.E+00 0.E+00 S2 -0.7 -4.E-03 -3.E-04 3.E-05 -1.E-06 -6.E-08 1.E-08 0.E+00 S11 2.7 -1.E-03 1.E-04 -1.E-05 5.E-07 5.E-09 0.E+00 3.E-11 S12 12.1 -3.E-03 3.E-04 -2.E-05 9.E-07 1.E-08 -2.E-09 0.E+00

[0109] Among them, -7.E-04 means that the coefficient A of the surface number S1 is -7×10 -4 .

[0110] Figure 6 yes Figure 5The schematic diagram of the light fan of the optical lens is shown in Figure 6 As shown in the figure, the schematic diagrams of light fan at different field angles (0.00°, 10.00°, 16.00°, 20.00°, 30.00°, 40.00°, 45.00°, 50.00°) are respectively reflected. In the schematic diagram of light fan at each field angle, curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of optical lens imaging. Figure 6 It can be seen that the deviation of the light relative to the main light coordinate is controlled within ±25um, which shows that the optical lens can better control the aberration.

[0111] Figure 7 yes Figure 5 The schematic diagram of the axial aberration curve of the optical lens shown in FIG. Figure 7 As shown in the figure, the curves of different colors represent different wavelengths of system imaging (656nm, 588nm, 546nm, 486nm, 436nm). Figure 7 It can be seen that the offset of axial aberration is controlled within ±0.025mm, which shows that the optical lens can correct axial aberration well.

[0112] Figure 8 yes Figure 5 The schematic diagram of the light fan of the optical lens is shown in Figure 8 As shown in the figure, the curves of different colors represent different wavelengths of system imaging (656nm, 588nm, 546nm, 486nm, 436nm). Figure 8 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.03mm, indicating that the optical lens can correct the field curvature well.

[0113] In another possible embodiment, Figure 9 This is a schematic diagram of the structure of another optical lens provided by the embodiment of the present invention. Table 7 describes in detail another feasible implementation method. Figure 9 The specific optical physical parameters of the optical lens are shown.

[0114] Table 7 Another optical physical parameter design of optical lens

[0115] Example 3 Lower limit Upper limit TTL / H 7.322 7.000 8 TTL / F 4.242 4.5 BFL / F 0.470 0.400 ENPD / TTL 0.147 0.100 f1 / F -1.624 -2.000 0 f2 / F 13.939 0.000 15 f3 / F 1.594 0.000 2 f4 / F 1.063 0.000 2 f5 / F -1.174 -2.000 0 f6 / F 3.270 0.000 4.5 f4 / f5 -0.906 -1.500 -0.5 |F45 / F| 5.139 5.000 8 R1 / (R2+d1) 1.059 0.800 1.5 R3 / (R4+d2) 1.474 0.800 1.5 R1 / F 0.835 0.500 1 R8 / F 1.411 1.000 1.5 R11 / F 1.144 1.000 1.5 Vd4 / Vd5 2.881 3.000 3.5 Nd4 / Nd5 0.863 0.800 0.9

[0116] Table 8 shows the design parameters of the surface type, curvature radius, thickness and material of each lens in another optical lens corresponding to Table 7.

[0117] Table 8 Another parameter design of each lens in the optical lens

[0118] Surface number Surface type Radius of curvature thickness Materials (nd) Material (vd) 1 Aspheric 5.82 2.66 1.806 40.91 2 Aspheric 2.83 3.06 3 spherical surface -9.00 3.40 1.835 42.73 4 spherical surface -9.50 0.08 5 spherical surface 11.08 5.94 1.729 54.68 6 spherical surface -23.56 0.08 STO (aperture) PL Infinity 2.00 8 spherical surface 9.82 3.27 1.593 68.53 9 spherical surface -6.99 2.31 1.847 23.78 10 spherical surface Infinity 0.60 11 Aspheric 7.96 2.85 1.589 61.16 12 Aspheric 16.89 0.80 13 spherical surface Infinity 0.30 1.517 64.20 14 spherical surface Infinity 1.30 15 spherical surface Infinity 0.50 1.517 64.20 16 spherical surface Infinity 0.38 IMA Infinity /

[0119] The optical lens of this embodiment includes a first lens 10, a second lens 20, a third lens 30, an aperture 70, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a filter glass 80, arranged sequentially along the optical axis from the object side to the image side. The surface numbers are numbered according to the order of the surfaces of the lenses, where "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface is curved toward the image side, and a negative value indicating that the surface is curved toward the object side. "Infinity" represents that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to refract light, with a blank space representing that the current position is air.

[0120] In the optical lens of this embodiment, the first lens element 10 and the sixth lens element 60 are aspherical lenses. The object-side surface S1 and the image-side surface S2 of the first lens element 10 are both aspherical surfaces, and the object-side surface S11 and the image-side surface S12 of the sixth lens element 60 are both aspherical surfaces. The aspherical surface shape of this embodiment can be defined by the following aspherical surface formula, but is not limited to the following expression method:

[0121]

[0122] Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of y along the optical axis, c = 1 / R, R is the radius of curvature of the aspheric surface near the optical axis, k is the cone coefficient, A, B, C, D, E, F, and G correspond to the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order coefficients of the aspheric polynomial, respectively.

[0123] Table 9 Aspheric coefficients of another optical lens

[0124] Serial number K A B C D E F G S1 -1.8 -9.E-04 -8.E-05 2.E-06 8.E-09 -3.E-11 -5.E-11 9.E-13 S2 -0.7 -5.E-03 -2.E-04 2.E-05 -7.E-07 8.E-09 -3.E-10 8.E-13 S11 1.7 -1.E-03 9.E-05 -6.E-06 1.E-07 2.E-09 -6.E-11 -3.E-12 S12 5.4 -3.E-03 2.E-04 -7.E-06 7.E-08 2.E-09 2.E-10 -8.E-12

[0125] Among them, -9.E-04 means that the coefficient A of the surface number S1 is -9×10 -4 .

[0126] Figure 10 yes Figure 9 The schematic diagram of the light fan of the optical lens is shown in Figure 10As shown in the figure, the schematic diagrams of light fan at different field angles (0.00°, 10.00°, 16.00°, 20.00°, 30.00°, 40.00°, 45.00°, 50.00°) are respectively reflected. In the schematic diagram of light fan at each field angle, curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of optical lens imaging. Figure 10 It can be seen that the deviation of the light relative to the main light coordinate is controlled within ±25um, which shows that the optical lens can better control the aberration.

[0127] Figure 11 yes Figure 9 The schematic diagram of the axial aberration curve of the optical lens shown in FIG. Figure 11 As shown in the figure, the curves of different colors represent different wavelengths of system imaging (656nm, 588nm, 546nm, 486nm, 436nm). Figure 11 It can be seen that the offset of axial aberration is controlled within ±0.02mm, which shows that the optical lens can correct axial aberration well.

[0128] Figure 12 yes Figure 9 The schematic diagram of the light fan of the optical lens is shown in Figure 12 As shown in the figure, the curves of different colors represent different wavelengths of system imaging (656nm, 588nm, 546nm, 486nm, 436nm). Figure 12 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.03mm, indicating that the optical lens can correct the field curvature well.

[0129] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An optical lens, characterized in that: include: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens are arranged in sequence along the optical axis from the object side to the image side; The first lens has negative optical power, and the object-side surface of the first lens is convex and the image-side surface is concave; The second lens has positive refractive power, and the object-side surface of the second lens is concave and the image-side surface is convex; The third lens has positive refractive power, and the object-side surface and the image-side surface of the third lens are convex; The fourth lens has positive refractive power, and the object-side surface and the image-side surface of the fourth lens are convex; The fifth lens has negative optical power, and the object-side surface of the fifth lens is concave and the image-side surface is flat; The sixth lens has positive refractive power, and the object-side surface of the sixth lens is convex and the image-side surface is concave; The total length TTL of the optical system of the optical lens and the entrance pupil diameter ENPD satisfy the following relationship: ENPD / TTL≥0.

1.

2. The optical lens according to claim 1, wherein: The total optical system length TTL of the optical lens and the image height H of the optical lens at the maximum field angle satisfy the following: 7<TTL / H<8.

3. The optical lens according to claim 1, wherein: The focal length F of the optical lens and the total length TTL of the optical system of the optical lens satisfy the following relationship: TTL / F<4.

5.

4. The optical lens according to claim 1, wherein: The optical back focus BFL of the optical lens and the total length TTL of the optical system of the optical lens satisfy: BFL / TTL>0.

4.

5. The optical lens according to claim 1, wherein: The refractive index Nd1 of the first lens satisfies: Nd1 ≥ 1.

7.

6. The optical lens according to claim 5, wherein: The Abbe number Vd4 of the fourth lens element and the Abbe number Vd5 of the fifth lens element satisfy the following relationship: 3<Vd4 / Vd5<3.5; A refractive index Nd4 of the fourth lens element and a refractive index Nd5 of the fifth lens element satisfy the following relationship: 0.8<Nd4 / Nd5<0.

9.

7. The optical lens according to claim 1, wherein: The focal lengths of the first to sixth lenses satisfy: -2 <f1 / F<0; 0<f2 / F<15; 0<f3 / F<2; 0<f4 / F<2; -2 <f5 / F<0; 0 <f6 / F<4.5; Among them, F is the focal length value of the optical lens, f1 is the focal length value of the first lens, f2 is the focal length value of the second lens, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, f5 is the focal length value of the fifth lens, and f6 is the focal length value of the sixth lens.

8. The optical lens according to claim 1, wherein: The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the following relationship: -1.5<f4 / f5<-0.

5.

9. The optical lens according to claim 1, wherein: A central curvature radius R1 of the object-side surface of the first lens, a central curvature radius R2 of the image-side surface of the first lens, and a central thickness d1 of the first lens satisfy the following relationship: 0.8≤R1 / (R2+d1)≤1.

5.

10. The optical lens according to claim 1, wherein: The central curvature radius R1 of the object-side surface of the first lens and the focal length F of the optical lens satisfy the following relationship: 0.5<R1 / F<1.

11. The optical lens according to claim 1, wherein: A central curvature radius R3 of the object-side surface of the second lens, a central curvature radius R4 of the image-side surface of the second lens, and a central thickness d2 of the second lens satisfy the following relationship: 0.8≤R3 / (R4+d2)≤1.

5.

12. The optical lens according to claim 1, wherein: The central curvature radius R8 of the object-side surface of the fourth lens and the focal length F of the optical lens satisfy the following relationship: 1<R8 / F<1.

5.

13. The optical lens according to claim 1, wherein: The central curvature radius R11 of the image surface of the sixth lens and the focal length F of the optical lens satisfy the following relationship: 1<R11 / F<1.

5.

14. The optical lens according to claim 1, wherein: The fourth lens and the fifth lens form a cemented lens.

15. The optical lens according to claim 14, wherein: The focal length f45 of the cemented lens formed by the fourth lens and the fifth lens satisfies the following relationship with the focal length F of the optical lens: 5≤|f45 / F|≤8.

16. The optical lens according to claim 1, wherein: Also includes: Aperture; the aperture is located in the optical path between the third lens and the fourth lens.

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