Optical lens

Abstract

The invention 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 has the characteristics of high imaging definition, small size and large aperture.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of optical devices, and in particular to an optical lens. Background Art

[0002] With the advancement of science and technology, optical lenses are widely used in various fields, and the performance requirements of optical lenses in various fields are getting higher and higher. For example, when optical lenses are used in the field of assisted driving, in order to ensure the safety and stability of driving, the assisted driving system needs to be equipped with an optical lens with a higher resolution so as to be able to collect images with higher clarity 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. Summary of the invention

[0004] The present invention provides an optical lens, which can meet the requirements of large aperture and small volume under the premise of ensuring that the optical lens has high resolution and high imaging clarity.

[0005] The present invention 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 an optical axis from an object side to an 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 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 a concave surface, and the image side surface is a flat surface;

[0011] The sixth lens has positive 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 length TTL of the optical system of the optical lens and the image height H of the optical lens at the maximum field of view satisfy: 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: 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 and a refractive index Nd5 of the fifth lens satisfy: 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 value f4 of the fourth lens and the focal length value f5 of the fifth lens satisfy: -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: 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: 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: 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 relationship: 1<R11 / F<1.5.

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

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

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

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

[0037] Figure 1 It is a structural schematic diagram of an optical lens provided by the present invention;

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

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

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

[0048] Fig.12 yes Fig. 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 of 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] Moreover, the words "first", "second" and similar words 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", "one" or "the" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before 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" and similar words 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, the descriptions of the same, equal, etc. involved in the embodiments of the present disclosure do not mean that the two objects are completely equal in size and shape, and are allowed to be roughly the same or roughly equal within a certain error range.

[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 is a schematic diagram of the structure of an optical lens provided by an embodiment of the present invention, such as Figure 1 As shown, the optical lens comprises: 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 focal power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, and it characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power, the stronger the ability to bend light, and the smaller the absolute value of the focal power, the weaker the ability to bend light. When the focal power is a positive number, the refraction of light is convergent; when the focal power is a negative number, the refraction of light is divergent. The focal 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 lens from the first lens 10 to the sixth lens 60 can be fixed to a lens barrel ( Figure 1In the optical lens (not shown), by setting the first lens 10 to have a negative focal power, the optical lens has a larger field angle; the second lens 20 is set to have a positive focal power, so that the spherical aberration and coma of the light passing through the first lens 10 can be corrected, and the clarity and resolution of the image can be improved; the third lens 30 is set to have a positive focal power, which is conducive to the light passing through the system more smoothly, and is convenient for correcting field curvature and astigmatism, and improving the clarity and quality of the image; the fourth lens 40 is set to have a positive focal power, and the fifth lens 50 is set to have a negative focal power, which is conducive to the light passing through the optical system of the optical lens more smoothly, while increasing the imaging area of ​​the optical lens, and improving the clarity and quality of the image; the sixth lens 60 is set to have a positive focal power, which is conducive to balancing the various aberrations generated by the fifth lens 50, and improving the imaging quality of the optical system of the optical lens. In this way, by using six lenses with focal powers to form the optical lens, and reasonably allocating the focal powers of each lens, it is ensured that the optical lens can have a high imaging resolution while having the characteristics of a large aperture and a small volume.

[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 a plane; the object side surface of the sixth lens 60 is convex, and the image side surface is concave.

[0056] Among them, the object side of the lens can be understood as the surface of the lens close to the object plane, and the image side of the lens can be understood as the surface of the lens close to the image plane. In this embodiment, by reasonably setting the shape of each lens, the requirements of miniaturization and large aperture of the optical lens are met while enabling the optical lens to have clear imaging quality, so that the optical lens can be applied to a wider range of application scenarios. At the same time, the image side of the fifth lens 50 is a plane, which is conducive to the assembly between lenses and reduces assembly sensitivity.

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

[0058] Optionally, the total length TTL of the optical system of the optical lens and the image height H of the optical lens at the maximum field angle satisfy: 7<TTL / H<8. With such a setting, a large image plane can be achieved while the total length of the optical lens can be better compressed, so that the design of the optical lens can be miniaturized and easy to be mounted on other imaging devices.

[0059] Optionally, the focal length value F of the optical lens and the total optical system length TTL of the optical lens satisfy: 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 back focal length BFL of the optical lens and the total optical system length TTL of the optical lens satisfy: 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 beneficial to improving the imaging quality.

[0062] Optionally, the Abbe number Vd4 of the fourth lens 40 and the Abbe number Vd5 of the fifth lens 50 satisfy: 3 < Vd4 / Vd5 < 3.5; the refractive index Nd4 of the fourth lens 40 and the refractive index Nd5 of the fifth lens 50 satisfy: 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 eliminating 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 focal power, which is beneficial to expanding the field of view 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 focal power, 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 focal power, 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 realizing the temperature characteristic 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] Among them, by making the fourth lens 40 and the fifth lens 50 form a cemented lens, the air space between the fourth lens 40 and the fifth lens 50 can be reduced, thereby helping to reduce the total length of the optical lens; at the same time, the cemented lens can minimize or eliminate chromatic aberration, so that various aberrations of the optical lens can be fully corrected, and under the premise of compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, and the light loss caused by reflection between lenses can be reduced, and the illumination can be increased, thereby improving the image quality and the clarity of the optical lens imaging. In addition, the use of the cemented lens can also reduce the assembly components between the two lenses, simplify the assembly procedures in the optical lens manufacturing process, reduce costs, and reduce the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by the assembly process.

[0067] Optionally, the focal length f4 of the fourth lens 40 and the focal length f5 of the fifth lens 50 satisfy: -1.5<f4 / f5<-0.5. In this way, by setting the focal length ratio of the two positive and negative focal power cemented lenses of the fourth lens 40 with positive focal power and the fifth lens 50 with negative focal power to be greater than -1.5 and less than -0.5, it is beneficial to achieve the effect of eliminating chromatic aberration.

[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: 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 formed by 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, and the aberration caused by the large angle can be reduced. At the same time, the structure of the lens can be made compact, which is conducive to miniaturization and reduced sensitivity.

[0070] Optionally, the central curvature radius R1 of the object side surface of the first lens 10, the central curvature radius R2 of the image side surface of the first lens 10, and the central thickness d1 of the first lens 10 satisfy: 0.8≤R1 / (R2+d1)≤1.5. In this way, the shape of the first lens 10 can be close to concentric circles, so that there is an optical path difference between the peripheral light and the central light, and the central light is diverged, which is conducive to reducing the front port diameter of the optical lens, reducing the volume of the optical lens, and facilitating miniaturization and low cost.

[0071] Optionally, the central curvature radius R1 of the object side surface of the first lens 10 and the focal length value F of the optical lens satisfy: 0.5<R1 / F<1. In this way, by setting the lower limit of the ratio between the central curvature radius R1 of the object side surface of the first lens 10 and the focal length value F of the optical lens to 0.5, it is helpful to increase the field of view of the optical lens, thereby meeting the requirements of wide-range shooting; by setting the upper limit of the ratio between the central curvature radius R1 of the object side surface of the first lens 10 and the focal length value F of the optical lens to 1, it is helpful to reduce the effective aperture of the first lens 10, which is conducive to the 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: 0.8≤R3 / (R4+d2)≤1.5. In this way, the shape of the second lens 20 can be close to concentric circles, so that there is an optical path difference between the peripheral light and the central light, the central light is diverged, and it is beneficial to reduce the front port diameter of the optical lens, reduce the volume of the optical lens, and facilitate 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: 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 on 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 light 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 to improving the 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 of the third lens 30, which can reduce the generation of optical lens astigmatism, and is beneficial to converge the light entering the optical system and reduce the diameter of the rear port of the optical lens.

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

[0079] In summary, the embodiment of the present invention adopts six lenses with optical power to form an optical lens, and reasonably distributes the optical power of each lens, and reasonably selects materials and designs the shape of each lens, so that the optical lens can simultaneously meet the requirements of small size, large aperture, high resolution, and high resolution. The optical lens can have a higher presentation clarity, which is conducive to broadening the application field of the optical lens.

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

[0081] In a feasible embodiment, Table 1 describes in detail the following in a feasible implementation manner: Figure 1Specific optical physical parameters of the optical lens 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 (n.d.) Material (vd) 1 Aspheric 5.70 2.65 1.806 40.91 2 Aspheric 2.83 3.06 3 Spherical -8.93 3.40 1.871 40.73 4 Spherical -9.54 0.38 5 Spherical 9.92 6.50 1.729 54.68 6 Spherical -28.54 0.08 STO(Aperture) PL Infinity 1.70 8 Spherical 9.40 2.60 1.593 68.53 9 Spherical -6.63 2.30 1.847 23.78 10 Spherical Infinity 0.60 11 Aspheric 9.80 3.00 1.690 52.81 12 Aspheric 15.91 0.60 13 Spherical Infinity 0.30 1.517 64.20 14 Spherical Infinity 1.50 15 Spherical Infinity 0.50 1.517 64.20 16 Spherical 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 in sequence along the optical axis from the object side to the image side. The surface numbers are numbered according to the surface order of each lens, wherein "S1" represents the object side of the first lens, "S2" represents the image side of the first lens, and so on; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "Infinity" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from 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 deflect light, and a blank represents 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 the light, and a blank represents that the current position is air.

[0088] In the optical lens of this embodiment, the first lens 10 and the sixth lens 60 are aspherical lenses, and the object side surface S1 and the image side surface S2 of the first lens 10 are both aspherical surfaces, and the object side surface S11 and the image side surface S12 of the sixth lens 60 are both aspherical surfaces. The aspherical surface type 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 FIG. 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, indicating 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 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 means 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 FIG. Figure 4 As shown in the figure, the curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of the system imaging. Figure 4 It can be seen that the field curvature of the meridian 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 is a schematic diagram of the structure of another optical lens provided in an embodiment of the present invention. Table 4 describes in detail another feasible implementation manner. Figure 5 Specific optical physical parameters of the optical lens 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 (n.d.) Material (vd) 1 Aspheric 5.70 2.65 1.806 40.91 2 Aspheric 2.83 3.06 3 Spherical -8.93 3.40 1.871 40.73 4 Spherical -9.54 0.55 5 Spherical 9.95 7.00 1.729 54.68 6 Spherical -29.45 0.08 STO(Aperture) PL Infinity 1.42 8 Spherical 9.40 2.80 1.593 68.53 9 Spherical -6.54 2.30 1.847 23.78 10 Spherical Infinity 0.60 11 Aspheric 9.87 3.00 1.690 52.81 12 Aspheric 16.37 0.60 13 Spherical Infinity 0.30 1.517 64.20 14 Spherical Infinity 1.50 15 Spherical Infinity 0.50 1.517 64.20 16 Spherical 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 in sequence along the optical axis from the object side to the image side. The surface numbers are numbered according to the surface order of each lens, wherein "S1" represents the object side of the first lens, "S2" represents the image side of the first lens, and so on; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "Infinity" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from 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 deflect light, and a blank represents 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 the light, and a blank represents that the current position is air.

[0104] In the optical lens of this embodiment, the first lens 10 and the sixth lens 60 are aspherical lenses, and the object side surface S1 and the image side surface S2 of the first lens 10 are both aspherical surfaces, and the object side surface S11 and the image side surface S12 of the sixth lens 60 are both aspherical surfaces. The aspherical surface type 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 FIG. 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, indicating 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 (656nm, 588nm, 546nm, 486nm, 436nm) of the system imaging. Figure 7 It can be seen that the offset of axial aberration is controlled within ±0.025mm, which means 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 FIG. Figure 8 As shown in the figure, the curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of the system imaging. Figure 8 It can be seen that the field curvature of the meridian 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, Fig. 9 is a schematic diagram of the structure of another optical lens provided in an embodiment of the present invention. Table 7 describes in detail another feasible implementation method. Fig. 9 Specific optical physical parameters of the optical lens 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, material, etc. 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 (n.d.) Material (vd) 1 Aspheric 5.82 2.66 1.806 40.91 2 Aspheric 2.83 3.06 3 Spherical -9.00 3.40 1.835 42.73 4 Spherical -9.50 0.08 5 Spherical 11.08 5.94 1.729 54.68 6 Spherical -23.56 0.08 STO(Aperture) PL Infinity 2.00 8 Spherical 9.82 3.27 1.593 68.53 9 Spherical -6.99 2.31 1.847 23.78 10 Spherical Infinity 0.60 11 Aspheric 7.96 2.85 1.589 61.16 12 Aspheric 16.89 0.80 13 Spherical Infinity 0.30 1.517 64.20 14 Spherical Infinity 1.30 15 Spherical Infinity 0.50 1.517 64.20 16 Spherical 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 in sequence along the optical axis from the object side to the image side. The surface numbers are numbered according to the surface order of each lens, wherein "S1" represents the object side of the first lens, "S2" represents the image side of the first lens, and so on; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "Infinity" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from 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 deflect light, and a blank represents 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 the light, and a blank represents that the current position is air.

[0120] In the optical lens of this embodiment, the first lens 10 and the sixth lens 60 are aspherical lenses, and the object side surface S1 and the image side surface S2 of the first lens 10 are both aspherical surfaces, and the object side surface S11 and the image side surface S12 of the sixth lens 60 are both aspherical surfaces. The aspherical surface type 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] Fig.10 yes Fig. 9 The schematic diagram of the light fan of the optical lens is shown in FIG. Fig.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. Fig.10 It can be seen that the deviation of the light relative to the main light coordinate is controlled within ±25um, indicating that the optical lens can better control the aberration.

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

[0128] Fig.12 yes Fig. 9 The schematic diagram of the light fan of the optical lens is shown in FIG. Fig.12 As shown in the figure, the curves of different colors represent different wavelengths (656nm, 588nm, 546nm, 486nm, 436nm) of the system imaging. Fig.12 It can be seen that the field curvature of the meridian 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 only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and 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 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 a concave surface, and the image side surface is a flat surface; The sixth lens has positive 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, characterized in that: The total length TTL of the optical system of the optical lens and the image height H of the optical lens at the maximum field angle satisfy the following relationship: 7<TTL / H<8.

3. The optical lens according to claim 1, characterized in that: The focal length value 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, characterized in that: The optical back focus BFL of the optical lens and the total length TTL of the optical system of the optical lens satisfy the following condition: BFL / TTL>0.

4.

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

7.

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

9.

7. The optical lens according to claim 1, characterized in that: The focal lengths of the first lens to the sixth lens 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, characterized in that: The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -1.5<f4 / f5<-0.

5.

9. The optical lens according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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: 0.8≤R3 / (R4+d2)≤1.

5.

12. The optical lens according to claim 1, characterized in that: The central curvature radius R8 of the object side surface of the fourth lens satisfies the focal length F of the optical lens: 1<R8 / F<1.

5.

13. The optical lens according to claim 1, characterized in that: 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, characterized in that: The fourth lens and the fifth lens form a cemented lens.

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

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

Images