Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an image plane, in sequence: a diaphragm; a first lens with positive refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative refractive power, both the object side and the image side of which are concave surfaces; a third lens with positive refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a fourth lens with refractive power, the object side of which is a concave surface and the image side of which is a convex surface; a fifth lens with positive refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis; and a sixth lens with negative refractive power, the image side of which is a concave surface near the optical axis; wherein at least one of the first lens to the sixth lens is a non-spherical lens. The optical lens provided by the application has the advantages of at least a large aperture and high imaging quality, and can meet the use requirements of portable electronic devices.

Description

Technical Field

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

[0002] Currently, with the improvement of people's material lives, people have also begun to pursue spiritual fulfillment. In recent years, with the rapid development of the internet and communication technologies, portable electronic devices have become increasingly popular among consumers. With the widespread adoption of smartphones, the mobile phone industry has flourished, and the public's demands for mobile phones are constantly increasing. The camera function of mobile phones has become a crucial factor in people's purchasing decisions, leading mobile phone manufacturers to place new demands on the imaging lens assemblies in mobile phones.

[0003] Meanwhile, as image sensor performance improves and size decreases, the design freedom of corresponding lenses is decreasing, and the design difficulty is increasing daily. Therefore, how to ensure high image quality in mobile phones while maintaining the system's large aperture characteristics and compressing the overall system length to a usable range is a pressing problem to be solved. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of a large aperture and high image quality, and can meet the needs of portable electronic devices.

[0005] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: an aperture stop; a first lens with positive optical power, having a convex object side and a concave image side; a second lens with negative optical power, having both its object side and image side concave; a third lens with positive optical power, having a convex object side and a concave image side; a fourth lens with optical power, having a concave object side and a convex image side; a fifth lens with positive optical power, having a convex object side near the optical axis and a concave image side near the optical axis; and a sixth lens with negative optical power, having a concave image side near the optical axis; wherein the effective focal length f of the optical lens and the entrance pupil diameter EPD satisfy the condition: f / EPD < 1.8.

[0006] Compared with existing technologies, the optical lens provided by this invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, the optical lens has good image quality and can match a 108M imaging chip. At the same time, by reasonably configuring the lens aperture size, the amount of light entering the system can be increased and the depth of field during shooting can be reduced, thus meeting market demands. Attached Figure Description

[0007] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0008] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention;

[0009] Figure 2 This is an F-tanθ distortion curve of the optical lens according to the first embodiment of the present invention;

[0010] Figure 3 This is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention;

[0011] Figure 4 This is a graph showing the on-axis spherical aberration and chromatic aberration of the optical lens according to the first embodiment of the present invention.

[0012] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention;

[0013] Figure 6 This is an F-tanθ distortion curve of the optical lens according to the second embodiment of the present invention;

[0014] Figure 7 This is a field curvature curve diagram of the optical lens according to the second embodiment of the present invention;

[0015] Figure 8 This is a graph showing the on-axis spherical aberration and chromatic aberration of the optical lens according to the second embodiment of the present invention.

[0016] Figure 9 This is a schematic diagram of the optical lens structure according to the third embodiment of the present invention;

[0017] Figure 10 This is an F-tanθ distortion curve of the optical lens according to the third embodiment of the present invention;

[0018] Figure 11 This is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention;

[0019] Figure 12 This is a graph showing the on-axis spherical aberration and chromatic aberration of the optical lens according to the third embodiment of the present invention.

[0020] Figure 13 This is a schematic diagram of the structure of the optical lens according to the fourth embodiment of the present invention;

[0021] Figure 14 This is an F-tanθ distortion curve of the optical lens according to the fourth embodiment of the present invention;

[0022] Figure 15 This is a field curvature curve diagram of the optical lens according to the fourth embodiment of the present invention;

[0023] Figure 16This is a graph showing the on-axis spherical aberration and chromatic aberration of the optical lens according to the fourth embodiment of the present invention.

[0024] Figure 17 This is a schematic diagram of the optical lens structure according to the fifth embodiment of the present invention;

[0025] Figure 18 This is an F-tanθ distortion curve of the optical lens according to the fifth embodiment of the present invention;

[0026] Figure 19 This is a field curvature curve diagram of the optical lens according to the fifth embodiment of the present invention;

[0027] Figure 20 This is a graph showing the on-axis spherical aberration and chromatic aberration of the optical lens according to the fifth embodiment of the present invention. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] This invention proposes an optical lens with a total of six lenses, which are arranged along the optical axis from the object side to the imaging plane as follows: aperture stop, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and filter.

[0031] The first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The second lens has negative optical power, and both its object-side and image-side surfaces are concave. The third lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The fourth lens has optical power, its object-side surface is concave, and its image-side surface is convex. The fifth lens has positive optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The sixth lens has negative optical power, and its image-side surface is concave near the optical axis.

[0032] The optical lens provided by this invention uses a combination of six lenses with optical power, and through specific surface shape matching and reasonable optical power distribution, and by placing the aperture stop in front of the first lens, the optical lens has good imaging quality under the condition of satisfying a large aperture.

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

[0034] f / EPD < 1.8; (1)

[0035] Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When condition (1) is satisfied, the amount of light entering the optical system can be increased, while the depth of field during shooting can be reduced, thereby ensuring the imaging quality of the system in darker environments. More preferably, the effective focal length f and the entrance pupil diameter EPD of the optical lens satisfy condition: 1.7 <f / EPD<1.8。

[0036] In some embodiments, the optical lens satisfies the following condition:

[0037] 2.75 <EPD×tanθ<2.85;(2)

[0038] Wherein, EPD represents the entrance pupil diameter of the optical lens, and θ represents the maximum half-field angle of the optical lens. When the above condition (2) is satisfied, the amount of light entering the optical system can be effectively increased, ensuring the imaging quality of the system in dark environments.

[0039] In some embodiments, the optical lens satisfies the following condition:

[0040] 4.1 < (f5 - f6) / f < 4.3; (3)

[0041] Where f represents the effective focal length of the optical lens, f5 represents the effective focal length of the fifth lens, and f6 represents the effective focal length of the sixth lens. When the above condition (3) is satisfied, the optical power of the fifth and sixth lenses can be reasonably allocated, the surface shape of the fifth and sixth lenses can be controlled, which is beneficial to the correction of off-axis aberrations and improves the imaging quality of the overall optical system.

[0042] In some embodiments, the optical lens satisfies the following condition:

[0043] 6.1mm <TTL<6.2mm;(4)

[0044] 0.06 <CT4 / TTL<0.07;(5)

[0045] Where TTL represents the total optical length of the optical lens, and CT4 represents the center thickness of the fourth lens. When the above conditions (4) and (5) are met, the center thickness of the fourth lens can be reasonably allocated, which is beneficial to achieving the compactness of the imaging lens group structure and at the same time beneficial to correcting off-axis aberrations.

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

[0047] 0.8%<[IH-(f×tanθ)] / (f×tanθ)<1.6%; (6)

[0048] Where θ represents the maximum half-field angle of the optical lens, IH represents the image height corresponding to the maximum half-field angle of the optical lens, and f represents the effective focal length of the optical lens. When the above condition (6) is satisfied, it indicates that the distortion of the optical lens is well corrected and the shape reproduction of the captured image is extremely high; if the value of [IH-(f×tanθ)] / (f×tanθ) exceeds the lower limit, the optical system has a large negative distortion, the captured image will be barrel-shaped, which will affect the imaging effect; if the value of [IH-(f×tanθ)] / (f×tanθ) exceeds the upper limit, the optical system has a large positive distortion, the captured image will be pincushion-shaped, which will also affect the imaging effect.

[0049] In some embodiments, the optical lens satisfies the following condition:

[0050] 1.32 <f12 / f<1.42;(7)

[0051] Where f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the optical lens. When the above condition (7) is satisfied, the optical power of the first lens and the second lens can be effectively allocated, the rate of light convergence can be effectively slowed down, the light in the optical system can be smoothly imaged, the difficulty of aberration correction is reduced, and the imaging quality of the lens is improved.

[0052] In some embodiments, the optical lens satisfies the following condition:

[0053] 3 <f3 / f<5;(8)

[0054] 2 <R32 / R31<2.6;(9)

[0055] Where f3 represents the effective focal length of the third lens, f represents the effective focal length of the optical lens, R31 represents the radius of curvature of the object side of the third lens, and R32 represents the radius of curvature of the image side of the third lens. When the above conditions (8) and (9) are satisfied, the shape change of the third lens can be slowed down by adjusting the focal length and surface shape of the third lens, thereby reducing the system sensitivity, improving the formability of the lens, and increasing the manufacturing yield.

[0056] In some embodiments, the optical lens satisfies the following condition:

[0057] 5.9 <f / (SP45+SP56)<7.1;(10)

[0058] Where SP45 represents the air gap on the optical axis between the fourth lens and the fifth lens, SP56 represents the air gap on the optical axis between the fifth lens and the sixth lens, and f represents the effective focal length of the optical lens. When the above condition (10) is satisfied, the spherical aberration and chromatic aberration of the system can be better corrected by adjusting the position of the fifth lens in the optical system, thereby improving the imaging quality of the optical lens.

[0059] In some embodiments, the optical lens satisfies the following condition:

[0060] 0.7 <SAG51 / CT5<1.1;(11)

[0061] 1.1 <SAG52 / CT5<1.5;(12)

[0062] Wherein, SAG51 represents the sag at the maximum effective aperture on the object side of the fifth lens, SAG52 represents the sag at the maximum effective aperture on the image side of the fifth lens, and CT5 represents the center thickness of the fifth lens. When the above conditions (11) and (12) are satisfied, the field curvature sensitivity of the entire optical system can be reasonably controlled by adjusting the surface shape of the fifth lens, reducing the contribution of the fifth lens to astigmatism and coma in the entire optical system. At the same time, it is beneficial to reduce the surface shape complexity of the object side and image side of the fifth lens, and improve the processing and production yield.

[0063] In some embodiments, the optical lens satisfies the following condition:

[0064] 0.34 <CT3 / CT1<0.40;(13)

[0065] Wherein, CT3 represents the center thickness of the third lens, and CT1 represents the center thickness of the first lens. When the above condition (13) is met, the field curvature contribution of the two lenses can be reasonably controlled by adjusting the center thicknesses of the first and third lenses, which is beneficial to the optimization of off-axis aberrations by subsequent lenses.

[0066] In some embodiments, the optical lens satisfies the following condition:

[0067] Nd2>1.6; (14)

[0068] Nd5>1.6; (15)

[0069] Wherein, Nd2 represents the refractive index of the material of the second lens, and Nd5 represents the refractive index of the material of the fifth lens. When the above conditions (14) and (15) are satisfied, by setting the second lens and the fifth lens to be made of materials within a specific refractive index range, they can complement other lenses, effectively reducing the lens size while improving the imaging quality of the optical lens.

[0070] In some embodiments, the object-side surface of the sixth lens in the optical lens is concave near the optical axis; in other embodiments, the object-side surface of the sixth lens is convex near the optical axis. Different combinations of surface shapes for the sixth lens can all enable the system to achieve good imaging results.

[0071] As one implementation method, the first to sixth lenses can be made entirely of plastic or a combination of glass and plastic; both methods achieve good imaging results. In this application, the first to sixth lenses are all made entirely of plastic, and all are plastic aspherical lenses. Using aspherical lenses can effectively correct aberrations, improve image quality, and provide optical performance products with higher cost-effectiveness.

[0072] In various embodiments of the present invention, when an aspherical lens is used, the surface shape of the aspherical lens satisfies the following equation:

[0073]

[0074] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the conic coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0075] First Embodiment

[0076] Please see Figure 1 The above is a schematic diagram of the structure of the 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 S15, an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1, and the optical centers of each lens are located on the same straight line.

[0077] Specifically, the first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens L2 has negative optical power, with both its object-side surface S3 and image-side surface S4 being concave; the third lens L3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave; the fourth lens L4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex; the fifth lens L5 has positive optical power, with its object-side surface S9 being convex near the optical axis and its image-side surface S10 being concave near the optical axis; the sixth lens L6 has negative optical power, with its object-side surface S11 being concave near the optical axis and its image-side surface S12 being concave near the optical axis; the filter G1 has an object-side surface S13 and an image-side surface S14; wherein, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastic aspherical lenses.

[0078] The relevant parameters of each lens element in the optical lens 100 provided in this embodiment are shown in Table 1.

[0079] Table 1

[0080]

[0081] The surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0082] Table 2

[0083] Face number K A4 A6 A8 A10 S1 3.98E-01 -1.68E-02 2.36E-02 -3.40E-02 2.47E-02 S2 5.94E+00 -2.07E-02 -1.67E-02 5.74E-02 -8.65E-02 S3 8.85E+01 -4.44E-02 6.09E-02 -2.34E-02 -4.40E-03 S4 6.39E+01 -2.75E-02 1.64E-02 8.35E-02 -1.38E-01 S5 2.40E+01 -6.48E-02 1.06E-02 -1.71E-02 -3.79E-03 S6 4.24E+01 -3.67E-02 1.56E-02 -4.99E-02 6.23E-02 S7 -1.02E+02 -1.53E-01 1.44E-01 -1.10E-01 4.56E-02 S8 4.34E+00 -7.90E-02 5.66E-02 -3.38E-02 1.44E-02 S9 2.17E+00 -3.79E-02 4.05E-03 -5.63E-03 1.74E-03 S10 5.78E+00 -5.80E-04 -1.05E-02 8.30E-04 1.65E-04 S11 9.13E+01 -5.32E-02 7.32E-03 4.89E-05 -6.23E-05 S12 -1.97E-01 -4.79E-02 6.87E-03 -9.52E-04 8.85E-05 Face number A12 A14 A16 A18 A20 S1 -8.82E-03 -4.03E-04 1.34E-03 -3.61E-04 1.60E-05 S2 8.11E-02 -5.01E-02 1.94E-02 -4.27E-03 4.06E-04 S3 1.35E-02 -1.23E-02 7.45E-03 -2.56E-03 3.85E-04 S4 1.00E-01 -4.38E-02 2.31E-02 -1.37E-02 3.62E-03 S5 1.41E-02 -3.00E-02 3.90E-02 -2.57E-02 6.71E-03 S6 -5.16E-02 1.34E-02 1.28E-02 -1.13E-02 2.76E-03 S7 -4.04E-03 -6.01E-03 3.90E-03 -1.56E-03 3.13E-04 S8 -1.80E-03 -3.63E-04 1.22E-04 -2.25E-05 2.81E-06 S9 -4.87E-05 -4.80E-05 -9.21E-06 4.98E-06 -4.42E-07 S10 1.45E-05 -1.46E-05 2.49E-07 3.64E-07 -2.95E-08 S11 2.11E-06 1.92E-07 -6.82E-09 -6.10E-10 2.74E-11 S12 -2.75E-06 -2.43E-07 1.89E-08 -7.94E-11 -1.40E-11

[0084] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures shown are the F-tanθ distortion curve, field curvature curve, and on-axis spherical aberration and chromatic aberration curves of the optical lens 100. Figure 2 As can be seen, the absolute value of F-tanθ distortion is controlled within 1.6%, indicating that the F-tanθ distortion correction of the optical lens 100 is good; from Figure 3 As can be seen, the field curvature is controlled within ±0.1mm, indicating that the field curvature correction of the optical lens 100 is good; from Figure 4 As can be seen, the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm, indicating that the on-axis aberration correction of the optical lens 100 is good. In this embodiment, the optical lens 100 has a total optical length of only 6.19mm while achieving a maximum field of view of 86.2°, and from... Figure 2 , Figure 3 , Figure 4 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0085] Second Embodiment

[0086] Please see Figure 5 This is a schematic diagram of the structure of the optical lens 200 provided in the second embodiment of the present invention. The main differences between the optical lens 200 provided in the second embodiment and the optical lens 100 provided in the first embodiment are: the object side surface S11 of the sixth lens is convex near the optical axis, the fourth lens L4 has negative optical power, and the curvature radius and air gap of each lens are different.

[0087] The relevant parameters of each lens element in the optical lens 200 provided in this embodiment are shown in Table 3.

[0088] Table 3

[0089]

[0090] The surface coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0091] Table 4

[0092] Face number K A4 A6 A8 A10 S1 3.94E-01 -1.68E-02 2.35E-02 -3.40E-02 2.47E-02 S2 5.35E+00 -2.11E-02 -1.68E-02 5.74E-02 -8.65E-02 S3 -1.00E+02 -4.41E-02 6.10E-02 -2.33E-02 -4.39E-03 S4 6.39E+01 -2.67E-02 1.69E-02 8.37E-02 -1.38E-01 S5 2.42E+01 -6.37E-02 1.13E-02 -1.68E-02 -3.70E-03 S6 3.29E+01 -3.78E-02 1.55E-02 -4.99E-02 6.24E-02 S7 -8.43E+01 -1.52E-01 1.43E-01 -1.11E-01 4.54E-02 S8 4.36E+00 -7.90E-02 5.65E-02 -3.39E-02 1.43E-02 S9 2.17E+00 -3.80E-02 4.22E-03 -5.60E-03 1.74E-03 S10 5.78E+00 2.24E-05 -1.05E-02 8.31E-04 1.65E-04 S11 -1.04E+02 -5.32E-02 7.33E-03 4.91E-05 -6.23E-05 S12 -1.97E-01 -4.79E-02 6.87E-03 -9.52E-04 8.84E-05 Face number A12 A14 A16 A18 A20 S1 -8.83E-03 -4.06E-04 1.34E-03 -3.61E-04 1.59E-05 S2 8.11E-02 -5.01E-02 1.94E-02 -4.27E-03 4.06E-04 S3 1.35E-02 -1.23E-02 7.45E-03 -2.56E-03 3.86E-04 S4 1.00E-01 -4.38E-02 2.31E-02 -1.37E-02 3.61E-03 S5 1.41E-02 -3.00E-02 3.89E-02 -2.57E-02 6.69E-03 S6 -5.15E-02 1.34E-02 1.28E-02 -1.13E-02 2.75E-03 S7 -4.06E-03 -6.01E-03 3.91E-03 -1.56E-03 3.15E-04 S8 -1.80E-03 -3.62E-04 1.23E-04 -2.23E-05 2.87E-06 S9 -4.86E-05 -4.80E-05 -9.22E-06 4.98E-06 -4.42E-07 S10 1.45E-05 -1.46E-05 2.49E-07 3.64E-07 -2.95E-08 S11 2.11E-06 1.92E-07 -6.83E-09 -6.10E-10 2.74E-11 S12 -2.75E-06 -2.43E-07 1.89E-08 -7.93E-11 -1.40E-11

[0093] Please refer to Figure 6 , Figure 7 as well as Figure 8 The figures shown are the F-tanθ distortion curve, field curvature curve, and on-axis spherical aberration and chromatic aberration curves of the optical lens 200. Figure 6 As can be seen, the absolute value of F-tanθ distortion is controlled within 1.6%, indicating that the F-tanθ distortion correction of the optical lens 200 is good; from Figure 7 As can be seen, the field curvature is controlled within ±0.3mm, indicating that the field curvature correction of the 200mm optical lens is relatively good; from Figure 8 As can be seen, the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm, indicating that the on-axis aberration correction of the 200mm optical lens is relatively good. From Figure 6 , Figure 7 , Figure 8 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0094] Third Embodiment

[0095] Please see Figure 9 This is a schematic diagram of the structure of the optical lens 300 provided in the third embodiment of the present invention. The main difference between the optical lens 300 provided in the third embodiment and the optical lens 100 provided in the first embodiment is that the fourth lens L4 has negative optical power, and the curvature radius and air gap of each lens are different.

[0096] The relevant parameters of each lens element in the optical lens 300 provided in this embodiment are shown in Table 5.

[0097] Table 5

[0098]

[0099] The surface shape coefficients of each aspherical surface of the optical lens 300 in this embodiment are shown in Table 6.

[0100] Table 6

[0101] Face number K A4 A6 A8 A10 S1 3.89E-01 -1.60E-02 2.31E-02 -3.40E-02 2.47E-02 S2 5.65E+00 -2.06E-02 -1.68E-02 5.73E-02 -8.65E-02 S3 9.49E+01 -4.23E-02 6.09E-02 -2.34E-02 -4.39E-03 S4 6.42E+01 -2.69E-02 1.72E-02 8.35E-02 -1.38E-01 S5 2.44E+01 -6.38E-02 9.16E-03 -1.77E-02 -3.88E-03 S6 4.48E+01 -3.65E-02 1.61E-02 -4.99E-02 6.23E-02 S7 -8.16E+01 -1.52E-01 1.44E-01 -1.10E-01 4.56E-02 S8 4.38E+00 -7.91E-02 5.67E-02 -3.39E-02 1.43E-02 S9 2.18E+00 -3.67E-02 4.15E-03 -5.63E-03 1.74E-03 S10 5.78E+00 -2.84E-04 -1.04E-02 8.34E-04 1.65E-04 S11 -1.00E+02 -5.31E-02 7.33E-03 4.89E-05 -6.23E-05 S12 -1.96E-01 -4.75E-02 6.85E-03 -9.53E-04 8.84E-05 Face number A12 A14 A16 A18 A20 S1 -8.82E-03 -4.04E-04 1.34E-03 -3.63E-04 1.52E-05 S2 8.11E-02 -5.01E-02 1.94E-02 -4.27E-03 4.06E-04 S3 1.35E-02 -1.23E-02 7.45E-03 -2.56E-03 3.85E-04 S4 9.99E-02 -4.39E-02 2.31E-02 -1.37E-02 3.64E-03 S5 1.41E-02 -2.99E-02 3.89E-02 -2.56E-02 6.74E-03 S6 -5.15E-02 1.33E-02 1.28E-02 -1.12E-02 2.80E-03 S7 -4.02E-03 -6.01E-03 3.91E-03 -1.55E-03 3.17E-04 S8 -1.81E-03 -3.66E-04 1.22E-04 -2.25E-05 2.81E-06 S9 -4.88E-05 -4.80E-05 -9.22E-06 4.98E-06 -4.42E-07 S10 1.45E-05 -1.46E-05 2.49E-07 3.64E-07 -2.95E-08 S11 2.11E-06 1.92E-07 -6.82E-09 -6.10E-10 2.74E-11 S12 -2.75E-06 -2.43E-07 1.89E-08 -7.90E-11 -1.40E-11

[0102] Please refer to Figure 10 , Figure 11 as well as Figure 12 The figures shown are the F-tanθ distortion curve, field curvature curve, and on-axis spherical aberration and chromatic aberration curves of the optical lens 300. Figure 10 As can be seen, the absolute value of F-tanθ distortion is controlled within 1.6%, indicating that the F-tanθ distortion correction of the 300mm optical lens is relatively good; from Figure 11 As can be seen, the field curvature is controlled within ±0.08mm, indicating that the field curvature correction of the 300mm optical lens is good; from Figure 12 As can be seen, the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm, indicating that the on-axis aberration correction of the 300mm optical lens is relatively good. From Figure 10 , Figure 11 , Figure 12 It can be seen that the aberrations of the 300 optical lens are well balanced, resulting in good optical imaging quality.

[0103] Fourth embodiment

[0104] Please see Figure 13 This is a schematic diagram of the structure of the optical lens 400 provided in the fourth embodiment of the present invention. The main difference between the optical lens 400 provided in the fourth embodiment and the optical lens 100 provided in the first embodiment is that the fourth lens L4 has negative optical power, and the curvature radius and air gap of each lens are different.

[0105] The relevant parameters of each lens element in the optical lens 400 provided in this embodiment are shown in Table 7.

[0106] Table 7

[0107]

[0108] The surface coefficients of each aspherical surface of the optical lens 400 in this embodiment are shown in Table 8.

[0109] Table 8

[0110] Face number K A4 A6 A8 A10 S1 3.52E-01 -1.71E-02 2.37E-02 -3.39E-02 2.47E-02 S2 4.80E+00 -2.14E-02 -1.71E-02 5.74E-02 -8.65E-02 S3 -1.00E+02 -4.04E-02 6.11E-02 -2.38E-02 -4.47E-03 S4 6.11E+01 -1.90E-02 1.64E-02 8.40E-02 -1.38E-01 S5 1.95E+01 -5.57E-02 1.54E-02 -1.66E-02 -4.05E-03 S6 8.89E+01 -3.12E-02 1.74E-02 -4.95E-02 6.24E-02 S7 -1.01E+02 -1.52E-01 1.40E-01 -1.10E-01 4.63E-02 S8 5.25E+00 -7.61E-02 5.49E-02 -3.43E-02 1.44E-02 S9 2.19E+00 -3.87E-02 4.05E-03 -5.61E-03 1.74E-03 S10 5.81E+00 -1.07E-03 -1.04E-02 8.38E-04 1.65E-04 S11 1.00E+02 -5.33E-02 7.33E-03 4.87E-05 -6.24E-05 S12 -1.90E-01 -4.83E-02 6.89E-03 -9.51E-04 8.85E-05 Face number A12 A14 A16 A18 A20 S1 -8.83E-03 -4.16E-04 1.33E-03 -3.62E-04 1.71E-05 S2 8.11E-02 -5.01E-02 1.94E-02 -4.27E-03 4.05E-04 S3 1.36E-02 -1.23E-02 7.46E-03 -2.57E-03 3.76E-04 S4 1.00E-01 -4.37E-02 2.32E-02 -1.37E-02 3.58E-03 S5 1.42E-02 -2.96E-02 3.93E-02 -2.56E-02 6.51E-03 S6 -5.15E-02 1.34E-02 1.28E-02 -1.13E-02 2.72E-03 S7 -3.82E-03 -6.04E-03 3.85E-03 -1.58E-03 3.21E-04 S8 -1.77E-03 -3.51E-04 1.24E-04 -2.26E-05 2.55E-06 S9 -4.82E-05 -4.80E-05 -9.22E-06 4.98E-06 -4.42E-07 S10 1.45E-05 -1.46E-05 2.48E-07 3.64E-07 -2.95E-08 S11 2.11E-06 1.92E-07 -6.78E-09 -6.08E-10 2.70E-11 S12 -2.75E-06 -2.44E-07 1.89E-08 -7.93E-11 -1.40E-11

[0111] Please refer to Figure 14 , Figure 15 as well as Figure 16 The figures shown are the F-tanθ distortion curve, field curvature curve, and on-axis spherical aberration and chromatic aberration curves of the optical lens 400, respectively. Figure 14 As can be seen, the absolute value of F-tanθ distortion is controlled within 1.6%, indicating that the F-tanθ distortion correction of the 400mm optical lens is relatively good; from Figure 15 As can be seen, the field curvature is controlled within ±0.12mm, indicating that the field curvature correction of the 400mm optical lens is good; from Figure 16 As can be seen, the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm, indicating that the on-axis aberration correction of the 400mm optical lens is quite good. From Figure 14 , Figure 15 , Figure 16 It can be seen that the aberrations of the 400mm optical lens are well balanced, resulting in good optical imaging quality.

[0112] Fifth embodiment

[0113] Please see Figure 17 This is a schematic diagram of the structure of the optical lens 500 provided in the fifth embodiment of the present invention. The main differences between the optical lens 500 provided in the fifth embodiment and the optical lens 100 provided in the first embodiment are: the object-side surface S11 of the sixth lens L6 is convex near the optical axis, the fourth lens L4 has negative optical power, and the curvature radius and air gap of each lens are different.

[0114] The relevant parameters of each lens element in the optical lens 500 provided in this embodiment are shown in Table 9.

[0115] Table 9

[0116]

[0117] The surface coefficients of each aspherical surface of the optical lens 500 in this embodiment are shown in Table 10.

[0118] Table 10

[0119] Face number K A4 A6 A8 A10 S1 3.91E-01 -1.64E-02 2.31E-02 -3.39E-02 2.47E-02 S2 4.63E+00 -2.20E-02 -1.67E-02 5.74E-02 -8.65E-02 S3 -1.00E+02 -4.22E-02 6.10E-02 -2.36E-02 -4.53E-03 S4 6.40E+01 -2.52E-02 1.71E-02 8.31E-02 -1.38E-01 S5 2.50E+01 -6.21E-02 9.42E-03 -1.77E-02 -3.99E-03 S6 5.12E+01 -3.49E-02 1.55E-02 -5.01E-02 6.22E-02 S7 -7.55E+01 -1.47E-01 1.44E-01 -1.11E-01 4.54E-02 S8 4.58E+00 -7.15E-02 5.74E-02 -3.40E-02 1.43E-02 S9 2.13E+00 -3.50E-02 4.11E-03 -5.60E-03 1.74E-03 S10 5.78E+00 7.75E-04 -1.03E-02 8.38E-04 1.65E-04 S11 -1.00E+02 -5.34E-02 7.33E-03 4.93E-05 -6.23E-05 S12 -2.00E-01 -4.79E-02 6.83E-03 -9.51E-04 8.86E-05 Face number A12 A14 A16 A18 A20 S1 -8.82E-03 -4.07E-04 1.34E-03 -3.62E-04 1.59E-05 S2 8.11E-02 -5.01E-02 1.94E-02 -4.27E-03 4.06E-04 S3 1.35E-02 -1.23E-02 7.47E-03 -2.56E-03 3.82E-04 S4 9.98E-02 -4.39E-02 2.31E-02 -1.37E-02 3.66E-03 S5 1.40E-02 -3.00E-02 3.89E-02 -2.57E-02 6.70E-03 S6 -5.16E-02 1.34E-02 1.28E-02 -1.13E-02 2.77E-03 S7 -4.06E-03 -6.00E-03 3.91E-03 -1.56E-03 3.15E-04 S8 -1.82E-03 -3.64E-04 1.23E-04 -2.21E-05 2.91E-06 S9 -4.84E-05 -4.81E-05 -9.23E-06 4.98E-06 -4.42E-07 S10 1.46E-05 -1.46E-05 2.49E-07 3.63E-07 -2.96E-08 S11 2.11E-06 1.92E-07 -6.82E-09 -6.09E-10 2.74E-11 S12 -2.74E-06 -2.43E-07 1.89E-08 -8.05E-11 -1.41E-11

[0120] Please refer to Figure 18 , Figure 19 as well as Figure 20 The figures shown are the F-tanθ distortion curve, field curvature curve, and on-axis spherical aberration and chromatic aberration curves of the optical lens 500. Figure 18 As can be seen, the absolute value of F-tanθ distortion is controlled within 1.7%, indicating that the F-tanθ distortion correction of the 500mm optical lens is relatively good; from Figure 19 As can be seen, the field curvature is controlled within ±0.13mm, indicating that the field curvature correction of the 500mm optical lens is relatively good; from Figure 20 It can be seen that the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm, indicating that the on-axis aberration correction of the 500mm optical lens is quite good. From Figure 18 , Figure 19 , Figure 20 It can be seen that the aberrations of the 500 optical lens are well balanced, resulting in good optical imaging quality.

[0121] Please refer to Table 11, which shows the optical characteristics of the optical lenses provided in the above five embodiments, including the maximum field of view 2θ, total optical length TTL, half image height IH, effective focal length f, and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0122] Table 11

[0123]

[0124] As can be seen from the F-tanθ distortion curves, field curvature curves, and on-axis spherical aberration and chromatic aberration curves of the various embodiments above, the absolute value of the F-tanθ distortion of the optical lens in each embodiment is within 1.7%, the field curvature is within ±0.3mm, and the on-axis spherical aberration and chromatic aberration are controlled within ±0.05mm. This indicates that the optical lens provided by the present invention has advantages such as high imaging quality and large aperture, and at the same time has good resolution.

[0125] In summary, the optical lens provided by this invention uses a combination of six aspherical lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, the optical lens has the advantages of good image quality and large aperture.

[0126] 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.

[0127] 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 present 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 this patent should be determined by the appended claims.

Claims

1. An optical lens comprising six lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: Aperture; A first lens with positive 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 both the object-side and image-side surfaces of the second lens are concave. A third lens with positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is concave; A fourth lens with optical power, wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex; A fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex near the optical axis and the image-side surface of the fifth lens is concave near the optical axis; A sixth lens with negative optical power, wherein the image-side surface of the sixth lens is concave near the optical axis; The effective focal length f of the optical lens and the entrance pupil diameter EPD satisfy the condition: f / EPD<1.8; The optical lens satisfies the following condition: 4.1 < (f5 - f6) / f < 4.3; 1.32 <f12 / f<1.42; Where f represents the effective focal length of the optical lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, and f12 represents the combined focal length of the first lens and the second lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 2.75 <EPD×tanθ<2.85; Wherein, EPD represents the entrance pupil diameter of the optical lens, and θ represents the maximum half field of view of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.76 ≤ f / EPD < 1.8; 4.1 < (f5 - f6) / f < 4.3; Wherein, EPD represents the entrance pupil diameter of the optical lens, f represents the effective focal length of the optical lens, f5 represents the effective focal length of the fifth lens, and f6 represents the effective focal length of the sixth lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 6.1mm <TTL<6.2mm; 0.06 <CT4 / TTL<0.07; Wherein, TTL represents the total optical length of the optical lens, and CT4 represents the center thickness of the fourth lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.8%<[IH-(f×tanθ)] / (f×tanθ)<1.6%; Wherein, θ represents the maximum half field of view of the optical lens, IH represents the image height corresponding to the maximum half field of view of the optical lens, and f represents the effective focal length of the optical lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.353 ≤ f12 / f ≤ 1.407; Where f represents the effective focal length of the optical lens, and f12 represents the combined focal length of the first lens and the second lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 3 <f3 / f<5; 2 <R32 / R31<2.6; Wherein, f3 represents the effective focal length of the third lens, f represents the effective focal length of the optical lens, R31 represents the radius of curvature of the object side of the third lens, and R32 represents the radius of curvature of the image side of the third lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 5.9 <f / (SP45+SP56)<7.1; Wherein, SP45 represents the air gap on the optical axis between the fourth lens and the fifth lens, SP56 represents the air gap on the optical axis between the fifth lens and the sixth lens, and f represents the effective focal length of the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.7 <SAG51 / CT5<1.1; 1.1 <SAG52 / CT5<1.5; Wherein, SAG51 represents the sag at the maximum effective aperture on the object side of the fifth lens, SAG52 represents the sag at the maximum effective aperture on the image side of the fifth lens, and CT5 represents the center thickness of the fifth lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.34 <CT3 / CT1<0.40; Wherein, CT3 represents the center thickness of the third lens, and CT1 represents the center thickness of the first lens.

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