Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal power, the object side of which is a convex surface and the image side of which is a concave surface; a diaphragm; a second lens with positive focal power, the object side of which is a convex surface and the image side of which is a convex surface; a third lens with negative focal power, the object side of which is a concave surface and the image side of which is a convex surface; a fourth lens with positive focal power, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with negative focal power, the object side of which is a concave surface and the image side of which is a convex surface near the optical axis; and a filter without focal power. The optical lens provided by the application adopts five aspheric lenses with specific focal power combinations and specific surface shapes and one filter without focal power, so that the optical lens has the advantages of super-large field of view, small head, short total length, and high resolution quality.

Description

TECHNICAL FIELD

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

[0002] The lens with super large field angle (field angle greater than 150°) is widely used in VR devices, monitoring devices and vehicle-mounted video recording devices at present. However, the lens currently has basic functions and meets basic use requirements, but still has problems such as long total length, large volume and large head aperture, which not only affects the size of the device, but also affects the appearance of the device when assembled in the device. SUMMARY

[0003] Therefore, the purpose of the present application is to provide an optical lens which has at least the advantages of super large field angle, small head, high resolution quality and the like.

[0004] The present application achieves the above-mentioned purposes through the following technical solutions.

[0005] The present application provides an optical lens, which comprises, in order from the object side to the imaging surface along the optical axis: a first lens with negative focal length, the object side surface of which is convex, and the image side surface of which is concave; a diaphragm; a second lens with positive focal length, the object side surface of which is convex, and the image side surface of which is convex; a third lens with negative focal length, the object side surface of which is concave, and the image side surface of which is convex; a fourth lens with positive focal length, the object side surface of which is convex, and the image side surface of which is convex; and a fifth lens with negative focal length, the object side surface of which is concave, and the image side surface of which is convex at the near optical axis; wherein the optical lens satisfies the following conditional expressions: 8 < R32 / R31 < 15; and 4 < φ52 / φ32 < 8; wherein R32 represents the curvature radius of the image side surface of the third lens, R31 represents the curvature radius of the object side surface of the third lens, φ52 represents the focal length of the image side surface of the fifth lens, and φ32 represents the focal length of the image side surface of the third lens.

[0006] Compared with the prior art, the optical lens provided by the present application has the characteristics of super large field angle, small head, short total length and high resolution quality by reasonably distributing the thickness and focal length of the five lenses and reasonably controlling the surface shape of each lens, and better meets the use requirements of the device equipped with the super wide-angle lens. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 The structure schematic diagram of the optical lens provided by the first embodiment of the present application is shown in the figure;

[0008] Figure 2 The optical distortion (F-θ distortion) curve of the optical lens in the first embodiment of the present application is shown in the figure;

[0009] Figure 3 A relative illumination curve diagram of the optical lens in the first embodiment of the present application;

[0010] Figure 4 A relative illumination curve diagram of the optical lens in the first embodiment of the present application;

[0011] Figure 5 A structure schematic diagram of the optical lens provided by the second embodiment of the present application;

[0012] Figure 6 An optical distortion (F-θ distortion) curve diagram of the optical lens in the second embodiment of the present application;

[0013] Figure 7 A relative illumination curve diagram of the optical lens in the second embodiment of the present application;

[0014] Figure 8 A relative illumination curve diagram of the optical lens in the second embodiment of the present application;

[0015] Figure 9 A structure schematic diagram of the optical lens provided by the third embodiment of the present application;

[0016] Figure 10 An optical distortion (F-θ distortion) curve diagram of the optical lens in the third embodiment of the present application;

[0017] Figure 11 A relative illumination curve diagram of the optical lens in the third embodiment of the present application;

[0018] Figure 12 A relative illumination curve diagram of the optical lens in the third embodiment of the present application; DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application is only for the purpose of describing the specific embodiments and is not intended to limit the present application. Throughout the specification, the same reference numbers refer to the same elements.

[0021] The present application provides an optical lens, which comprises, in sequence along an optical axis from an object side to an image plane, a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, and a filter.

[0022] wherein the first lens has negative refractive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has positive refractive power, the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the third lens has negative refractive power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the fourth lens has positive refractive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; and the fifth lens has negative refractive power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex at the near optical axis; and the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses.

[0023] In some embodiments, the optical lens satisfies the following conditional expressions:

[0024] FOV≥167°; (1)

[0025] 8<R32 / R31<15; (2)

[0026] 4<φ52 / φ32<8; (3)

[0027] wherein FOV represents the maximum field of view of the optical lens, R32 represents the radius of curvature of the image side surface of the third lens, R31 represents the radius of curvature of the object side surface of the third lens, φ52 represents the refractive power of the image side surface of the fifth lens, and φ32 represents the refractive power of the image side surface of the third lens. The combination of multiple aspherical lenses, through specific surface shape matching and reasonable refractive power distribution, while meeting the above conditional expressions (1) to (3), reasonably distributing the values of R32 / R31 and φ52 / φ32, so that the optical lens has the characteristics of super large field of view (FOV≥167°), small head, short total length, and high resolution quality.

[0028] In some embodiments, the optical lens satisfies the following conditional expressions:

[0029] 8.0<R11 / R12<9.5; (4)

[0030] -1.25<φ1 / φ2<-1.15; (5)

[0031] 0.30<SAG11 / SAG12<0.45; (6)

[0032] wherein R11 represents a curvature radius of the object side surface of the first lens, R12 represents a curvature radius of the image side surface of the first lens, φ1 represents a refractive power of the first lens, φ2 represents a refractive power of the second lens, SAG11 represents a sag of the object side surface of the first lens, and SAG12 represents a sag of the image side surface of the first lens. The above conditional expressions (4) to (6) are satisfied, and by reasonably controlling the surface shape and the refractive power of the first lens, the incident light rays are beneficially diverged, the incident angle of the light rays when entering the diaphragm is reduced, and the field of view of the optical lens is beneficially increased.

[0033] In some embodiments, the optical lens satisfies the following conditional expression:

[0034] 0.8 < CT1 / CT12 < 1.2; (7)

[0035] 0.7 < D12 / f < 1.0; (8)

[0036] wherein CT1 represents a center thickness of the first lens, CT12 represents an air gap of the first lens and the second lens on the optical axis, D12 represents an effective diameter of the image side surface of the first lens, and f represents an effective focal length of the optical lens. The above conditional expressions (7) and (8) are satisfied, and by reasonably controlling the relationship between the center thickness of the first lens and the air gap of the first lens and the second lens, and controlling the relationship between the effective diameter of the image side surface of the first lens and the effective focal length of the optical lens, the first lens and the second lens are beneficially arranged more compactly, the head diameter of the optical lens is reduced, and the requirement of a small head of the optical lens is satisfied.

[0037] In some embodiments, the optical lens satisfies the following conditional expression:

[0038] 1.8 < CT2 / CT3 < 2.0; (9)

[0039] 0.20 < (CT23+CT34) / CTb < 0.27; (10)

[0040] CT2 / CT3>0.5 (9) CT23 / CTb<0.1 (10) wherein CT2 represents the center thickness of the second lens, CT3 represents the center thickness of the third lens, CT23 represents the air gap of the second lens and the third lens on the optical axis, CT34 represents the air gap of the third lens and the fourth lens on the optical axis, and CTb represents the sum of the air gaps of the first lens to the fifth lens on the optical axis. The condition formula (9) is satisfied, the relationship between the center thickness of the second lens and the center thickness of the third lens is reasonably controlled, which is conducive to increasing the center thickness of the third lens and conducive to the structural design and processing of the third lens. The condition formula (10) is satisfied, the proportion of the air gap of the second lens and the third lens and the air gap of the third lens and the fourth lens in the sum of the air gaps of the first lens to the fifth lens on the optical axis is reasonably controlled, which is conducive to making the second lens, the third lens and the fourth lens more compact, conducive to shortening the total length of the optical lens and realizing the miniaturization of the optical lens.

[0041] In some embodiments, the optical lens satisfies the following condition formula:

[0042] -2<φ3 / f<-1.6; (11)

[0043] 0.070<CT3 / TTL<0.074; (12)

[0044] 4<(SAG41-SAG32) / CT34<6; (13)

[0045] wherein φ3 represents the optical power of the third lens, f represents the effective focal length of the optical lens, CT3 represents the center thickness of the third lens, TTL represents the total optical length of the optical lens, SAG41 represents the sag of the object side surface of the fourth lens, SAG32 represents the sag of the image side surface of the third lens, and CT34 represents the air gap of the third lens and the fourth lens on the optical axis. The condition formulas (11) to (13) are satisfied, the surface type and the center thickness of the third lens are reasonably controlled, which is conducive to correcting the spherical aberration generated by excessive folding of light rays through the first lens and the second lens and conducive to improving the imaging quality of the optical system.

[0046] In some embodiments, the optical lens satisfies the following condition formula:

[0047] -1.0<SAG41 / SAG42<-0.8; (14)

[0048] 11<CT4 / CT45<14; (15)

[0049] Wherein, SAG41 represents the sagittal height of the object side surface of the fourth lens, SAG42 represents the sagittal height of the image side surface of the fourth lens, CT4 represents the center thickness of the fourth lens, and CT45 represents the air gap between the fourth lens and the fifth lens on the optical axis. Satisfying the above-mentioned conditional equations (14) and (15) and rationally controlling the surface shape and center thickness of the fourth lens facilitates correction of field curvature in different fields of view and improves the imaging quality of the optical system.

[0050] In some embodiments, the optical lens satisfies the following conditional formula:

[0051] 0.45 <R51 / R52<0.55; (16)

[0052] 2.1<(CT5-SAG51-SAG52) / CT5<2.5; (17)

[0053] Wherein, R51 represents the radius of curvature of the object side of the fifth lens, R52 represents the radius of curvature of the image side of the fifth lens, CT5 represents the center thickness of the fifth lens, SAG51 represents the sagittal height of the object side of the fifth lens, and SAG52 represents the sagittal height of the image side of the fifth lens. Satisfying the above-mentioned conditional equations (16) and (17) and rationally controlling the surface shape and center thickness of the fifth lens is beneficial for correcting coma aberration in a large field of view and improving the imaging quality of the off-axis field of view.

[0054] In some embodiments, the optical lens satisfies the following conditional formula:

[0055] 0.4 <D21 / D11<0.5; (18)

[0056] 0.6 <D31 / D11<0.7; (19)

[0057] Wherein, D11 represents the effective diameter of the objective side of the first lens, D21 represents the effective diameter of the objective side of the second lens, and D31 represents the effective diameter of the objective side of the third lens. Satisfying the above conditional equations (18) and (19) and rationally controlling the effective diameters of the objective sides of the first, second, and third lenses can help reduce the head diameter of the optical lens.

[0058] In some embodiments, the optical lens satisfies the following conditional formula:

[0059] 0.10 <CTb / TTL<0.15; (20)

[0060] 0.24 <FFL / TTL<0.30; (21)

[0061] Wherein, CTb represents the sum of air gap of each lens of the first lens to the fifth lens on the optical axis, FFL represents the distance from the fifth lens image side surface to the imaging surface on the optical axis, and TTL represents the total length of the optical lens. The condition formula (20) is satisfied, the proportion of the sum of air gap of each lens of the first lens to the fifth lens on the optical axis in the total length is reasonably controlled, which is conducive to making all lens distribution more compact, reducing the total length of the lens, and realizing the miniaturization of the lens; the condition formula (21) is satisfied, the proportion of the optical back focus in the total length is reasonably controlled, which is conducive to reducing the risk of interference between the mechanism and the lens, and facilitating the mechanism design of the product.

[0062] In some embodiments, the optical lens satisfies the following condition formula:

[0063] 57.3 < f * FOV / IH < 60.0; (22)

[0064] Wherein, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. The condition formula (22) is satisfied, the relationship between the effective focal length, the field of view angle and the image height is reasonably controlled, which is conducive to reducing the optical distortion of the lens and improving the imaging quality of the image edge.

[0065] In some embodiments, the optical lens satisfies the following condition formula:

[0066] 1.15 < Nd1 / Nd2 < 1.25; (23)

[0067] Wherein, Nd1 represents the refractive index of the first lens, and Nd2 represents the refractive index of the second lens. The condition formula (23) is satisfied, the refractive indices of the first lens and the second lens are reasonably controlled, the refractive index of the first lens is increased, which is conducive to reducing the incident angle of light entering the diaphragm and increasing the field of view angle of the optical lens.

[0068] As an embodiment, all-plastic lenses can be used, or glass-plastic hybrid lenses can be used, both of which can achieve good imaging effect; in the present application, in order to obtain better optical performance and better matching processing technology, one piece of molded glass lens and four pieces of plastic lens are combined, the refractive power of each lens is reasonably distributed and the aspheric surface shape is optimized, so that the optical lens has at least the advantages of super large field of view angle, small head, short total length, and high resolution quality.

[0069] The application will be further described in the following embodiments. In each embodiment, the thickness, radius of curvature, material selection of each lens in the optical lens are different, and the specific differences can be seen from the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0070] In each embodiment of the application, when the lens is a aspherical lens, the surface shape of the aspherical lens satisfies the following equation:

[0071]

[0072] Wherein, z is the distance vector height of the aspherical surface at a height of h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient, A 2i is the aspherical surface type coefficient of the 2i-th order.

[0073] First embodiment

[0074] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the first embodiment of the application. The optical lens 100 includes, in order from the object side to the imaging surface S13 along the optical axis, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a filter G1.

[0075] Specifically, the first lens L1 has a negative focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has a positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface; the third lens L3 has a negative focal power, the object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface; the fourth lens L4 has a positive focal power, the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface; the fifth lens L5 has a negative focal power, the object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface at the near optical axis; the object side surface of the filter G1 is S11, and the image side surface is S12. Among them, the first lens L1 is a molded aspherical lens, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are plastic aspherical lenses.

[0076] The related parameters of each lens in the optical lens 100 provided in the first embodiment of the application are shown in Table 1.

[0077] Table 1

[0078]

[0079]

[0080] The surface type coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in Table 2.

[0081] Table 2

[0082]

[0083] In this embodiment, the structural diagram, optical distortion (F-θ distortion), relative luminance and curve graph of the relative axial chromatic aberration of the optical lens 100 are shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 respectively.

[0084] Figure 2 The optical distortion (F-θ distortion) curve of the optical lens 100 in this embodiment is shown, which represents the distortion at different image heights on the imaging plane, and it can be seen from the graph that the optical distortion is controlled within ±5%, which indicates that the distortion of the optical lens 100 is well corrected.

[0085] Figure 3 The relative luminance curve of the optical lens 100 in this embodiment is shown, which represents the ratio of the luminance of different fields of view to the central field of view, and it can be seen from the graph that the relative luminance of the maximum field of view is controlled to be more than 30%, which indicates that the relative luminance of each field of view of the optical lens 100 is good.

[0086] Figure 4 The relative axial chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the relative axial chromatic aberration value between light of different wavelengths and light of the main wavelength, and it can be seen from the graph that the relative axial chromatic aberration value of light of each wavelength is controlled to be within ±3.5μm, which indicates that the relative axial chromatic aberration of the optical lens 100 is well corrected.

[0087] Second Embodiment

[0088] Referring to Figure 5 , a structural schematic diagram of an optical lens 200 provided in the second embodiment of the present application is shown, and the optical lens 200 in this embodiment is basically the same as that in the first embodiment, and the differences are shown in Table 3 and Table 4.

[0089] The related parameters of each lens in the optical lens 200 provided in the second embodiment of the present application are shown in Table 3.

[0090] Table 3

[0091]

[0092] The surface type coefficients of the aspherical surfaces of the optical lens 200 in this embodiment are shown in Table 4.

[0093] Table 4

[0094]

[0095]

[0096] In this embodiment, the structural diagram, optical distortion (F-theta distortion), relative luminance and curve graph of the relative axial chromatic aberration of the optical lens 200 are shown in Figure 5 , Figure 6 , Figure 7 and Figure 8 respectively. As can be seen from the graphs, the optical distortion is controlled within ±5%, which indicates that the distortion of the optical lens 200 is well corrected; the relative luminance of the maximum field of view is controlled to be more than 30%, which indicates that the relative luminance of each field of view of the optical lens 200 is good; the relative axial chromatic aberration value of light of each wavelength is controlled to be within ±3.5 μm, which indicates that the relative axial chromatic aberration of the optical lens 200 is well corrected.

[0097] Third Embodiment

[0098] Referring to Figure 9 , a structural diagram of an optical lens 300 provided in the third embodiment of the present application is shown, the optical lens 300 in this embodiment is basically the same as that in the first embodiment, and the differences are shown in Table 5 and Table 6.

[0099] The related parameters of each lens in the optical lens 300 provided in the third embodiment of the present application are shown in Table 5.

[0100] Table 5

[0101]

[0102]

[0103] The surface type coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in Table 6.

[0104] Table 6

[0105]

[0106] In this embodiment, the structural diagram, optical distortion (F-theta distortion), relative luminance and curve graph of the relative axial chromatic aberration of the optical lens 300 are shown in Figure 9 , Figure 10 , Figure 11 and Figure 12As shown in the figure, the optical distortion is controlled within ±5%, which indicates that the distortion of the optical lens 300 is well corrected; the relative luminance of the maximum field of view is controlled above 30%, which indicates that the relative luminance of each field of view of the optical lens 300 is good; the value of the sagittal chromatic aberration of light of each wavelength is controlled within ±3.5 μm, which indicates that the sagittal chromatic aberration of the optical lens 300 is well corrected.

[0107] Table 7 is the optical characteristics corresponding to the above three embodiments, mainly including the effective focal length f, the aperture number F# of the system, the total optical length TTL, the maximum field of view angle FOV and the image height IH corresponding to the maximum field of view angle FOV, and the numerical value corresponding to each of the above condition formulas.

[0108] Table 7

[0109]

[0110] In summary, the optical lens provided by the present application adopts five aspheric lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the FOV of the optical lens can reach more than 167°, the effective diameter of the first lens is within 1.2 mm, the five lenses are arranged compactly and the TTL of the lens is below 2.9 mm, so that the optical lens has the advantages of super large field of view, small head, short total length and high resolution quality.

[0111] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as the limitation of the scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising five lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: a first lens having negative optical power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; Aperture; a second lens having positive refractive power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is convex; a third lens having negative optical power, wherein the object-side surface of the third lens is concave and the image-side surface of the third lens is convex; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; a fifth lens having negative optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex near the optical axis; Wherein, the optical lens satisfies the following conditional formula: 8 <R32 / R31<15; 4<φ52 / φ32<8; Among them, R32 represents the curvature radius of the image side surface of the third lens, R31 represents the curvature radius of the object side surface of the third lens, φ52 represents the optical focal length of the image side surface of the fifth lens, and φ32 represents the optical focal length of the image side surface of the third lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 8.0 <R11 / R12<9.5; -1.25<φ1 / φ2<-1.15; 0.30 <SAG11 / SAG12<0.45; Among them, R11 represents the curvature radius of the object side of the first lens, R12 represents the curvature radius of the image side of the first lens, φ1 represents the optical focal length of the first lens, φ2 represents the optical focal length of the second lens, SAG11 represents the sag of the object side of the first lens, and SAG12 represents the sag of the image side of the first lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.8 <CT1 / CT12<1.2; 0.7 <D12 / f<1.0; Wherein, CT1 represents the center thickness of the first lens, CT12 represents the air gap between the first lens and the second lens on the optical axis, D12 represents the effective diameter of the image side of the first lens, and f represents the effective focal length of the optical lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 1.8 <CT2 / CT3<2.0; 0.20<(CT23+CT34) / CTb<0.27; Wherein, CT2 represents the center thickness of the second lens, CT3 represents the center thickness of the third lens, CT23 represents the air gap between the second lens and the third lens on the optical axis, CT34 represents the air gap between the third lens and the fourth lens on the optical axis, and CTb represents the sum of the air gaps between the first lens to the fifth lens on the optical axis.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -2.0<φ3 / f<-1.6; 0.070 <CT3 / TTL<0.075; 4<(SAG41-SAG32) / CT34<6; Among them, φ3 represents the optical power of the third lens, f represents the effective focal length of the optical lens, CT3 represents the center thickness of the third lens, TTL represents the total optical length of the optical lens, SAG41 represents the sagittal height of the object side of the fourth lens, SAG32 represents the sagittal height of the image side of the third lens, and CT34 represents the air gap between the third lens and the fourth lens on the optical axis.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -1.0 <SAG41 / SAG42<-0.8; 11 <CT4 / CT45<14; Among them, SAG41 represents the sagittal height of the object side of the fourth lens, SAG42 represents the sagittal height of the image side of the fourth lens, CT4 represents the center thickness of the fourth lens, and CT45 represents the air gap between the fourth lens and the fifth lens on the optical axis.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.45 <R51 / R52<0.55; 2.1<(CT5-SAG51-SAG52) / CT5<2.5; Among them, R51 represents the curvature radius of the objective side of the fifth lens, R52 represents the curvature radius of the image side of the fifth lens, CT5 represents the center thickness of the fifth lens, SAG51 represents the sag of the objective side of the fifth lens, and SAG52 represents the sag of the image side of the fifth lens.

8. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.4 <D21 / D11<0.5; 0.6 <D31 / D11<0.7; Wherein, D11 represents the effective diameter of the objective side of the first lens, D21 represents the effective diameter of the objective side of the second lens, and D31 represents the effective diameter of the objective side of the third lens.

9. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 57.3 <f*FOV / IH<60.0; Wherein, f represents the effective focal length of the optical lens, FOV represents the maximum field of view of the optical lens, and IH represents the real image height corresponding to the maximum field of view of the optical lens.

10. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 1.15 <Nd1 / Nd2<1.25; Wherein, Nd1 represents the refractive index of the first lens, and Nd2 represents the refractive index of the second lens.

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