Optical lens

Abstract

The application discloses an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a first lens with negative focal length, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative focal length, the object side of which is a concave surface; a third lens with positive focal length, the object side of which is a convex surface; a diaphragm; a fourth lens with positive focal length, 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 length; a sixth lens with positive focal length, the object side of which is a convex surface; and a seventh lens with negative focal length; wherein the image height IH corresponding to the maximum half field angle of the optical lens and the effective focal length f of the optical lens satisfy 1.0 < IH / f < 1.4. The application can effectively reduce the total length and volume of the optical lens and realize the characteristics of large field angle, small distortion, high pixels and the like.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an optical lens. Background Technology

[0002] As people's income levels rise, the number of people who enjoy outdoor sports has surged. However, while enjoying the fun of sports and outdoor experiences, recording life and wonderful moments has also become a basic need for everyone. As people's love for photography grows, their pursuit of image quality has become more diversified. They demand both high-definition image quality and a wide field of view to capture wide-ranging, visually impactful scenes. At the same time, lightweight action cameras with excellent image stabilization are becoming increasingly popular among outdoor sports enthusiasts. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of a large field of view, small size, and high pixel count.

[0004] This invention discloses an optical lens, comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens with negative optical power, the object side of which is convex and the image side of which is concave; a second lens with negative optical power, the object side of which is concave; a third lens with positive optical power, the object side of which is convex; an aperture stop; a fourth lens with positive optical power, the object side of which is convex and the image side of which is convex; a fifth lens with negative optical power; a sixth lens with positive optical power, the object side of which is convex; and a seventh lens with negative optical power; wherein the image height IH corresponding to the maximum half-field angle of view of the optical lens and the effective focal length f of the optical lens satisfy the condition: 1.0 < IH / f < 1.4.

[0005] Compared with the prior art, the beneficial effects of the present invention are: by using a combination of seven lenses, and by reasonably setting the optical power and surface shape of each lens, as well as the thickness and spacing between each lens, the total length and volume of the optical lens can be effectively reduced, and characteristics such as large field of view, large image plane, small distortion, and high pixel count can be achieved. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention.

[0007] Figure 2 This is a distortion curve diagram of the optical lens according to the first embodiment of the present invention.

[0008] Figure 3 This is a chromatic aberration curve of the optical lens according to the first embodiment of the present invention.

[0009] Figure 4 This is an axial aberration curve of the optical lens according to the first embodiment of the present invention.

[0010] Figure 5 This is an MTF curve of the optical lens according to the first embodiment of the present invention.

[0011] Figure 6 This is a relative illumination curve of the optical lens according to the first embodiment of the present invention.

[0012] Figure 7 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention.

[0013] Figure 8 This is a distortion curve diagram of the optical lens according to the second embodiment of the present invention.

[0014] Figure 9 This is a chromatic aberration curve of the optical lens according to the second embodiment of the present invention.

[0015] Figure 10 This is an axial aberration curve of the optical lens according to the second embodiment of the present invention.

[0016] Figure 11 This is an MTF curve of the optical lens according to the second embodiment of the present invention.

[0017] Figure 12 This is a relative illumination curve of the optical lens according to the second embodiment of the present invention.

[0018] Figure 13 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention.

[0019] Figure 14 This is a distortion curve diagram of the optical lens according to the third embodiment of the present invention.

[0020] Figure 15 This is a chromatic aberration curve of the optical lens according to the third embodiment of the present invention.

[0021] Figure 16 This is an axial aberration curve of the optical lens according to the third embodiment of the present invention.

[0022] Figure 17 This is an MTF curve of the optical lens according to the third embodiment of the present invention.

[0023] Figure 18 This is a relative illumination curve of the optical lens according to the third embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0025] 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 this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0026] The present invention provides an optical lens, which includes, in sequence along the optical axis from the object side to the imaging plane: a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter, wherein the optical centers of each lens are located on the same straight line.

[0027] The first lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. The second lens has negative optical power, its object-side surface is concave, and its image-side surface is convex near the optical axis. The third lens has positive optical power, its object-side surface is convex, and its image-side surface is either convex or concave near the optical axis. The fourth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The fifth lens has negative optical power, its object-side surface is concave, and its image-side surface is concave. The sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is either convex or concave. The seventh lens has negative optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis.

[0028] In some embodiments, the image height IH corresponding to the maximum half-field angle of the optical lens and the effective focal length f of the optical lens satisfy the condition: 1.0 < IH / f < 1.4. Satisfying this range is beneficial for controlling the field of view of the optical lens, giving it the characteristics of a large field of view and a large image plane.

[0029] In some implementations, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy the following condition: 2.5 < f / EPD < 3.0. Meeting this range is beneficial for controlling the relative aperture of the optical lens, thereby allowing for reasonable adjustment of the amount of light entering the optical system and the relative illumination.

[0030] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy the condition: -3.0 < f1 / f < -2.0. Satisfying this range allows light entering the first lens to converge well into the optical system, while also reducing the difficulty of aberration correction and ensuring the imaging quality of the optical lens.

[0031] In some embodiments, the radius of curvature R21 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy the following condition: -1.5 < R21 / f < -1.0; the radius of curvature R21 of the object-side surface of the second lens and the radius of curvature R22 of the image-side surface of the second lens satisfy the following condition: 0.05 < R21 / R22 < 0.25. Meeting these ranges, by rationally setting the surface shape of the second lens, helps to reduce the incident angle of light entering the optical system, reduces the difficulty of aberration correction, and ensures the imaging quality of the optical lens.

[0032] In some embodiments, the center thickness CT3 of the third lens and the effective focal length f of the optical lens satisfy the condition: 0.42 < CT3 / f < 0.50. Meeting this range allows for proper control of the thickness of the third lens, which facilitates adjustment of its optical power and promotes a smoother transition of light.

[0033] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following condition: -2.2 < f2 / f3 < -1.5; the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy the following condition: 0.8 < CT2 / CT3 < 1.3. Meeting these ranges, by rationally setting the focal length and center thickness of the second and third lenses, helps to reduce the difficulty of correcting optical system distortion and improve the resolution of the optical lens.

[0034] In some embodiments, the radius of curvature R51 of the object-side surface of the fifth lens and the radius of curvature R52 of the image-side surface of the fifth lens satisfy the condition: -1.5 < R51 / R52 < -0.2. Meeting this range allows for a more reasonable setting of the surface shape of the fifth lens, which helps to reduce the incident angle CRA of the principal ray, improve the relative illumination of the optical system, better correct off-axis rays, reduce higher-order aberrations, and improve the overall imaging quality of the optical lens.

[0035] In some embodiments, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the center thickness CT6 of the sixth lens, along with the edge thicknesses ET4 of the fourth lens, ET5 of the fifth lens, and ET6 of the sixth lens, satisfy the following ratio: 0.8 < (CT4 + CT5 + CT6) / (ET4 + ET5 + ET6) < 1.3. Meeting this range, and by reasonably controlling the ratio of the center thickness to the edge thickness of the fourth, fifth, and sixth lenses, helps ensure the feasibility of lens manufacturing and improves the yield rate of optical lenses.

[0036] In some embodiments, the effective aperture D62 of the sixth lens on the image side and the effective aperture D71 of the seventh lens on the object side satisfy the condition: 0.65 < D62 / D71 < 0.8. Meeting this range facilitates control of the light emission angle of the optical lens, enabling the chip to better receive light.

[0037] In some embodiments, the radius of curvature R72 of the image-side surface of the seventh lens and the effective focal length f of the optical lens satisfy the following condition: 0.5 < R72 / f < 1.0; the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy the following condition: -5.0 < f7 / f < -2.5. Meeting these ranges allows for further adjustment of the light emission angle and improvement of the imaging quality of the optical lens through reasonable adjustment of the focal length and surface shape of the seventh lens.

[0038] In some implementations, the image height IH corresponding to the maximum half-field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy the following condition: 3.2 < IH / EPD < 3.7. Satisfying this range is beneficial for balancing the image plane size and the relative illumination at the edge of the field of view, achieving a balance between a large field of view and miniaturization.

[0039] In some implementations, the combined focal length f456 of the fourth, fifth, and sixth lenses satisfies the condition that 4.5 < f456 / f < 5.5 with the effective focal length f of the optical lens. Meeting this range helps eliminate higher-order aberrations in the optical lens, improves resolution, and optimizes the imaging effect.

[0040] In some implementations, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 4.0 < TTL / f < 5.0. By satisfying this range and reasonably controlling the ratio of the total optical length to the focal length of the optical lens, miniaturization can be achieved while ensuring better light convergence on the imaging surface, which is beneficial for achieving a balance between a large image size and miniaturization.

[0041] In some implementations, the optical back focal length (EFL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 0.3 < EFL / f < 0.5. Meeting this range allows the optical lens to have a longer optical back focal length, which is beneficial for the assembly of the optical lens.

[0042] As one implementation method, the optical lens provided by the present invention can use all-plastic lenses or a hybrid glass-plastic combination, both of which can achieve good imaging results. In the embodiment of the present invention, the optical lens uses a hybrid glass-plastic combination. By rationally allocating the optical power of each lens and optimizing the aspherical shape, the optical lens has at least the advantages of good imaging quality, a large field of view, and miniaturization.

[0043] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0044] In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface shape of the lens satisfies the following equation: Where z represents the distance vector from the aspherical surface to the vertex along the optical axis at a height of h, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0045] First Embodiment

[0046] Please see Figure 1 The diagram shows a schematic of the structure of an optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0047] Specifically, the first lens L1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens L2 has negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex near the optical axis; the third lens L3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave near the optical axis; the fourth lens L4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S6 is concave near the optical axis. Side surface S8 is convex; the fifth lens L5 has negative optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave; the sixth lens L6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave; the seventh lens L7 has negative optical power, the object side surface S13 of the seventh lens is convex near the optical axis, and the image side surface S14 of the seventh lens is concave near the optical axis; the object side surface S15 and the image side surface S16 of the filter G1 are both planar.

[0048] The relevant parameters of each lens in the optical lens 100 provided in this embodiment are shown in Table 1.

[0049] Table 1

[0050]

[0051] In this embodiment, the aspherical surface profile system of each lens in the optical lens 100 is shown in Table 2.

[0052] Table 2

[0053]

[0054]

[0055] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 The figures shown are the distortion curve, transverse chromatic aberration curve, axial aberration curve, MTF curve, and relative illumination curve of the optical lens 100. Among them, from... Figure 2 As can be seen, the distortion value is controlled within ±5%, indicating that the distortion correction of the optical lens 100 is good; from Figure 3 As can be seen, the transverse chromatic aberration between the longest and shortest wavelengths is controlled within ±3μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 4 As can be seen, the axial aberrations of the longest and shortest wavelengths are controlled within ±0.02mm, indicating that the axial aberration correction of optical lens 100 is good; from Figure 5 As can be seen, the MTF value is above 0.65 throughout the entire field of view. Within the range of 0–100 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good image quality and detail resolution at both low and high frequencies. Figure 6 As can be seen, the relative illumination value of the optical lens is still greater than 0.5 at the maximum half field of view, indicating that the optical lens has excellent relative illumination.

[0056] Second Embodiment

[0057] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 200 provided in the second embodiment of the present invention. The structure of the optical lens 200 in this embodiment is basically the same as that of the optical lens 100 in the first embodiment. The main differences are: the image side of the sixth lens is convex, the object side and image side of the seventh lens have inflection points, and the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0058] Specifically, the relevant parameters of each lens in the optical lens 200 provided in this embodiment are shown in Table 3.

[0059] Table 3

[0060]

[0061]

[0062] In this embodiment, the aspherical surface coefficients of each lens in the optical lens 200 are shown in Table 4.

[0063] Table 4

[0064]

[0065]

[0066] Please refer to Figure 8 , Figure 9 , Figure 10 , Figure 11 as well as Figure 12 The figures shown are the distortion curve, transverse chromatic aberration curve, axial aberration curve, MTF curve, and relative illumination curve of the optical lens 100. Among them, from... Figure 8 As can be seen, the distortion value is controlled within ±4%, indicating that the distortion correction of the optical lens 100 is good; from Figure 9 As can be seen, the transverse chromatic aberration between the longest and shortest wavelengths is controlled within ±3μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 10 As can be seen, the axial aberrations of the longest and shortest wavelengths are controlled within ±0.02mm, indicating that the axial aberration correction of optical lens 100 is good; from Figure 11 As can be seen, the MTF value is above 0.63 throughout the entire field of view. Within the range of 0–100 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good image quality and detail resolution at both low and high frequencies. Figure 12 As can be seen, the relative illumination value of the optical lens is still greater than 0.58 at the maximum half field of view, indicating that the optical lens has excellent relative illumination.

[0067] Third Embodiment

[0068] Please see Figure 13 The diagram shows a structural schematic of the optical lens 300 provided in the third embodiment of the present invention. The structure of the optical lens 300 in this embodiment is roughly the same as that of the optical lens 100 in the first embodiment. The main differences are: the image side of the sixth lens is convex, the object side and image side of the seventh lens have inflection points, and the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0069] Specifically, the relevant parameters of each lens in the optical lens 300 provided in this embodiment are shown in Table 5.

[0070] Table 5

[0071]

[0072]

[0073] In this embodiment, the aspherical surface coefficients of each lens in the optical lens 300 are shown in Table 6.

[0074] Table 6

[0075] Face number k [A2] [A4] [A6] A8 <!-- 8 -->]] S3 6.23E-02 0.00E+00 1.27E-02 -9.61E-04 7.24E-05 S4 8.26E+01 0.00E+00 1.33E-02 -6.98E-04 1.60E-04 S7 -1.23E+00 0.00E+00 -5.89E-03 -3.66E-03 -3.88E-03 S8 -2.07E+00 0.00E+00 -1.35E-02 -1.64E-02 7.38E-03 S9 1.83E+00 0.00E+00 -2.13E-02 -6.12E-03 5.79E-03 S10 -1.44E+01 0.00E+00 -9.38E-03 2.79E-03 5.43E-04 S11 -1.83E+01 0.00E+00 -1.47E-03 -1.35E-03 1.33E-03 S12 -1.68E+00 0.00E+00 -8.08E-03 2.86E-03 -5.89E-04 S13 -1.15E+01 0.00E+00 -3.76E-02 2.69E-03 8.29E-05 S14 -4.26E+00 0.00E+00 -2.23E-02 2.92E-03 -2.55E-04 Face number <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 -4.32E-07 -5.62E-07 6.20E-08 -2.06E-09 S4 -3.60E-05 4.82E-06 -2.49E-07 1.23E-08 S7 1.75E-03 -1.88E-04 -3.93E-03 3.72E-03 S8 -2.59E-03 -1.09E-04 5.44E-05 1.67E-04 S9 -1.54E-03 1.19E-04 6.15E-05 1.81E-05 S10 -1.55E-04 -1.59E-06 1.50E-06 -1.76E-07 S11 -1.75E-04 -6.67E-07 6.58E-07 8.86E-08 S12 1.22E-04 -5.98E-06 -1.16E-07 1.43E-07 S13 -2.13E-05 -8.84E-07 3.27E-07 -1.31E-08 S14 9.55E-06 2.38E-07 -4.02E-08 1.06E-09

[0076] Please refer to Figure 14 , Figure 15 , Figure 16 , Figure 17 as well as Figure 18 The figures shown are the distortion curve, transverse chromatic aberration curve, axial aberration curve, MTF curve, and relative illumination curve of the optical lens 100. Among them, from... Figure 14 As can be seen, the distortion value is controlled within ±4%, indicating that the distortion correction of the optical lens 100 is good; from Figure 15 As can be seen, the transverse chromatic aberration between the longest and shortest wavelengths is controlled within ±3μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 16 As can be seen, the axial aberrations of the longest and shortest wavelengths are controlled within ±0.02mm, indicating that the axial aberration correction of optical lens 100 is good; from Figure 17 As can be seen, the MTF value is above 0.63 throughout the entire field of view. Within the range of 0–100 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good image quality and detail resolution at both low and high frequencies. Figure 18 As can be seen, the relative illumination value of the optical lens is still greater than 0.56 at the maximum half field of view, indicating that the optical lens has excellent relative illumination.

[0077] Table 7 shows the optical characteristics corresponding to the three embodiments above, mainly including the effective focal length f, aperture number FNO, total optical length TTL, entrance pupil diameter EPD, maximum field of view FOV, image height IH corresponding to the maximum half field of view, and the values ​​corresponding to each of the above conditions in each embodiment.

[0078] Table 7

[0079] First Embodiment Second Embodiment Third Embodiment f(mm) 3.139 3.126 3.128 FNO 2.808 2.810 2.792 TTL(mm) 14.5 14.5 14.5 EPD (mm) 1.121 1.116 1.117 FOV (°) 152.2 152.2 152.2 IH(mm) 4.0 4.0 4.0 IH / f 1.274 1.280 1.279 f / EPD 2.800 2.801 2.801 f1 / f -2.523 -2.687 -2.734 R21 / f -1.453 -1.274 -1.272 R21 / R22 0.213 0.058 0.059 CT3 / f 0.478 0.454 0.455 f2 / f3 -2.099 -1.536 -1.532 CT2 / CT3 1.221 0.896 0.896 R51 / R52 -0.225 -1.164 -1.169 (CT4+CT5+CT6) / (ET4+ET5+ET6) 1.011 1.224 1.210 D62 / D71 0.707 0.778 0.769 R72 / f 0.901 0.650 0.643 IH / EPD 3.568 3.584 3.580 f7 / f -4.507 -3.202 -3.092 f456 / f 4.832 4.957 4.942 TTL / f 4.619 4.639 4.636 EFL / f 0.369 0.454 0.440

[0080] In summary, the optical lens provided by the embodiments of the present invention has at least the following advantages:

[0081] (1) Because glass has better light transmittance and higher refractive index, the optical lens provided by the present invention can have good thermal stability in high and low temperature environments through the reasonable combination of seven glass-plastic hybrid lenses, and has better light transmittance and optical performance, thus realizing high pixel imaging of the lens.

[0082] (2) The optical lens provided by the present invention uses seven glass-plastic hybrid lenses. Through specific surface shape matching and reasonable optical power distribution, it meets the requirements of a large field of view of the lens, and at the same time has the advantages of high pixel count and good resolution.

[0083] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: A first lens with negative optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave. A second lens with negative optical power, wherein the object side of the second lens is concave; A third lens with positive optical power, wherein the object side of the third lens is convex; Aperture; A fourth lens with positive optical 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 with negative optical power; A sixth lens with positive optical power, wherein the object side of the sixth lens is convex; A seventh lens with negative optical power; Wherein, the image height IH corresponding to the maximum half field of view of the optical lens and the effective focal length f of the optical lens satisfy: 1.0 < IH / f < 1.4; The optical lens satisfies the following condition: the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the effective focal length f of the optical lens satisfy: 4.5 < f456 / f < 5.

5.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.0 < f1 / f < -2.

0.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditions: the radius of curvature R21 of the object side of the second lens and the effective focal length f of the optical lens satisfy: -1.5 < R21 / f < -1.0; the radius of curvature R21 of the object side of the second lens and the radius of curvature R22 of the image side of the second lens satisfy: 0.05 < R21 / R22 < 0.

25.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the center thickness CT3 of the third lens and the effective focal length f of the optical lens satisfy: 0.42 < CT3 / f < 0.

50.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditions: the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -2.2 < f2 / f3 < -1.5; the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy: 0.8 < CT2 / CT3 < 1.

3.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the radius of curvature R51 of the object side of the fifth lens and the radius of curvature R52 of the image side of the fifth lens satisfy: -1.5 < R51 / R52 < -0.

2.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the center thickness CT6 of the sixth lens, and the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, and the edge thickness ET6 of the sixth lens satisfy: 0.8 < (CT4 + CT5 + CT6) / (ET4 + ET5 + ET6) < 1.

3.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the effective aperture D62 of the image side of the sixth lens and the effective aperture D71 of the object side of the seventh lens satisfy: 0.65 < D62 / D71 < 0.

8.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the radius of curvature R72 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R72 / f < 1.

0.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: the image height IH corresponding to the maximum half field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.2 < IH / EPD < 3.

7.

11. The optical lens according to claim 1, characterized in that, The image height IH corresponding to the maximum half field of view of the optical lens and the effective focal length f of the optical lens satisfy: 1.274≤IH / f≤1.280; The optical lens satisfies the following condition: the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the effective focal length f of the optical lens satisfy: 4.832≤f456 / f≤4.957.

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