Optical lens

Abstract

The present invention discloses an optical lens. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with positive optical power, whose image side is convex; a diaphragm; a second lens with positive optical power, whose object side is concave and whose image side is convex; a third lens with negative optical power, whose object side is convex near the optical axis and has at least one inflection point, and whose image side is concave near the optical axis and has at least one inflection point. By reasonably distributing the optical power and surface shape of the three lenses, the present invention has a compact structure, has good distortion correction while meeting a large viewing angle, achieves a balance of miniaturization, large wide angle, small distortion, and high imaging quality, and can effectively improve the user's camera experience.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and particularly to an optical lens. Background Art

[0002] At present, with the popularization of portable electronic devices (such as smart phones, tablets, endoscopes), and the popularity of social, video, and live broadcast software, people's love for photography is increasing. Camera lenses have become a standard configuration for portable electronic devices. Since portable electronic devices are developing towards thinner and ultra-wide-angle directions, higher requirements are put forward for the camera lenses mounted on portable electronic devices, which should have sufficient optical performance and imaging ability, and a smaller volume. However, most current camera lenses have problems of large volume and large distortion, making it difficult to meet the application requirements of thin and light devices and high imaging quality photography, and unable to bring a better visual experience to consumers. Summary of the Invention

[0003] Therefore, the purpose of the present invention is to provide an optical lens, which has at least the advantages of miniaturization, large field of view angle, and maintaining excellent optical distortion and high imaging quality.

[0004] The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with positive optical power, whose image side is convex; a diaphragm; a second lens with positive optical power, whose object side is concave and image side is convex; a third lens with negative optical power, whose object side is convex near the optical axis and has at least one inflection point, and whose image side is concave near the optical axis and has at least one inflection point; the optical lens satisfies the following conditional expressions: 100° < 2θ < 118°; 0.888 < [Tan(θ) × f] / IH < 1.114; where θ represents half of the maximum field of view angle of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual maximum semi-image height of the optical lens.

[0005] Compared with the prior art, the optical lens provided by the present invention uses three lenses with specific refractive powers, through specific optical power distribution, and by setting a diaphragm between the first lens and the second lens, making the optical lens have the advantages of miniaturization and large field of view angle; at the same time, through reasonable surface shape matching, the optical lens can maintain excellent optical distortion while having a large field of view angle, better meeting the use requirements of miniaturization, wide-angle, and high imaging quality of portable electronic devices. Brief Description of the Drawings

[0006] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0007] Figure 1Schematic diagram of the optical lens according to the first embodiment of the present invention;

[0008] Figure 2 F-Theta distortion curve graph of the optical lens according to the first embodiment of the present invention;

[0009] Figure 3 Paraxial field curvature curve graph of the optical lens according to the first embodiment of the present invention;

[0010] Figure 4 Transverse chromatic aberration graph of the optical lens according to the first embodiment of the present invention;

[0011] Figure 5 Schematic diagram of the optical lens according to the second embodiment of the present invention;

[0012] Figure 6 F-Theta distortion curve graph of the optical lens according to the second embodiment of the present invention;

[0013] Figure 7 Paraxial field curvature curve graph of the optical lens according to the second embodiment of the present invention;

[0014] Figure 8 Transverse chromatic aberration graph of the optical lens according to the second embodiment of the present invention;

[0015] Figure 9 Schematic diagram of the optical lens according to the third embodiment of the present invention;

[0016] Figure 10 F-Theta distortion curve graph of the optical lens according to the third embodiment of the present invention;

[0017] Figure 11 Paraxial field curvature curve graph of the optical lens according to the third embodiment of the present invention;

[0018] Figure 12 Transverse chromatic aberration graph of the optical lens according to the third embodiment of the present invention. Detailed implementation manners

[0019] To make the objectives, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention 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 technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. Throughout the specification, the same reference numerals refer to the same elements.

[0021] The present invention provides an optical lens, which has a total of three lenses. Along the optical axis, from the object side to the imaging surface, it sequentially includes: a first lens, a diaphragm, a second lens, a third lens, and a filter.

[0022] Among them, the first lens has a positive optical power, and the image side surface of the first lens is convex; the second lens has a positive optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the third lens has a negative optical power, the object side surface of the third lens is convex near the optical axis and has at least one inflection point, and the image side surface of the third lens is concave near the optical axis and has at least one inflection point; at the same time, the first lens, the second lens, and the third lens are all aspherical lenses.

[0023] The optical lens of the present invention adopts three aspherical lenses with specific refractive powers. Through specific optical power distribution and by setting a diaphragm between the first lens and the second lens, the optical lens has the advantages of miniaturization and a large field of view; at the same time, through reasonable surface shape matching, while having a large field of view, the optical lens can maintain excellent optical distortion, better meeting the usage requirements of miniaturization, wide-angle, and high imaging quality of portable electronic devices.

[0024] In some embodiments, the optical lens satisfies the following conditional expressions:

[0025] 100° < 2θ < 118°; (1)

[0026] 0.888 < [Tan(θ) × f] / IH < 1.114; (2)

[0027] Among them, 2θ represents the maximum field of view angle of the optical lens, θ represents half of the maximum field of view angle of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual maximum semi-image height of the optical lens. When the above conditional expressions (1) and (2) are satisfied, while having a large visible angle, the distortion aberration of the system can be effectively eliminated, so as to reduce the obvious deformation of the image around due to excessive stretching of the image caused by excessive distortion, greatly improving the reduction degree of the image relative to the real object, thereby obtaining a better shooting experience.

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

[0029] 0.70 < IH / TTL < 0.82; (3)

[0030] Among them, IH represents the actual maximum semi-image height of the optical lens, and TTL represents the overall optical length of the optical lens. When the above condition formula (3) is satisfied, by reasonably controlling the ratio of the semi-image height to the overall length of the optical system, it is beneficial to achieve a large imaging target surface for the optical system, and the pixel size can be increased under the same number of pixels, improving the acceptance energy efficiency of the chip for the light collected by the lens, thereby improving the imaging quality, and at the same time facilitating the maintenance of the miniaturization of the lens.

[0031] In some embodiments, the optical lens satisfies the following condition formula:

[0032] 0.246 < (R31 - R32) / (R31 + R32) < 0.562; (4)

[0033] Among them, R31 represents the curvature radius of the object side surface of the third lens, and R32 represents the curvature radius of the image side surface of the third lens. When the above condition formula (4) is satisfied, the surface shape and focal length of the third lens can be reasonably controlled, enabling the third lens to meet the design of a thin lens, which is beneficial to shortening the overall optical length, and at the same time facilitating the correction of optical distortion, greatly improving the reduction degree of the captured image.

[0034] In some embodiments, the optical lens satisfies the following condition formula:

[0035] 0.385 < f / TTL < 0.755; (5)

[0036] Among them, f represents the effective focal length of the optical lens, and TTL represents the overall optical length of the optical lens. When the above condition formula (5) is satisfied, the optical lens can have a longer effective focal length, while being beneficial to shortening the overall length of the lens, maintaining the miniaturization of the lens, and achieving an effective balance between a large viewing angle and miniaturization.

[0037] In some embodiments, the optical lens satisfies the following condition formula:

[0038] -195 < f1 / SAG11 < -98; (6)

[0039] Among them, f1 represents the effective focal length of the first lens, and SAG11 represents the sagitta at the maximum aperture of the object side surface of the first lens. When the above condition formula (6) is satisfied, by controlling the ratio of the focal length of the first lens to the negative sagitta at the maximum aperture of the object side surface, it is beneficial to increase the viewing angle of the optical system and at the same time shorten the overall system length; if it exceeds the lower limit, the marginal ray deflection is too slow, and the incident angle of the light reaching the diaphragm cannot be effectively compressed, which is not conducive to increasing the viewing angle; if it exceeds the upper limit, the negative sagitta at the maximum aperture of the object side surface of the first lens is too large, resulting in difficulty in processing and forming the lens.

[0040] In some embodiments, the optical lens satisfies the following conditional formula:

[0041] 0.385 < f / f1 < 0.755; (7)

[0042] Wherein, f represents the effective focal length of the optical system, and f1 represents the effective focal length of the first lens. When the above conditional formula (7) is satisfied, by restricting the ratio of the effective focal length of the optical lens to the effective focal length of the first lens, the light passing through the first lens can be made smoother, and while shortening the total length, the sensitivity of the imaging lens can be reduced.

[0043] In some embodiments, the optical lens satisfies the following conditional formula:

[0044] 1.65 < CT2 / ET2 < 3.625; (8)

[0045] Wherein, CT2 represents the thickness of the second lens on the optical axis, and ET2 represents the edge thickness of the second lens. When the above conditional formula (8) is satisfied, by reasonably controlling the thickness ratio of the second lens, it is possible to avoid the phenomenon that the plastic is difficult to fill the relatively thick center position due to the excessive thickness ratio of the lens during the molding process, resulting in air entrapment in the final product and affecting the imaging effect; at the same time, if the thickness ratio is too small, the total length of the optical system will become longer, which is not conducive to the miniaturization of the lens.

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

[0047] 0.49 < (CT1 + CT2 + AC1) / TTL < 0.62; (9)

[0048] Wherein, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, AC1 represents the air gap on the optical axis from the first lens to the second lens, and TTL represents the optical total length of the optical lens. When the above conditional formula (9) is satisfied, by restricting the center thicknesses of the first lens and the second lens and the air gap between the first lens and the second lens, the feasibility of processing and assembling the first lens and the second lens can be ensured, and at the same time, it is beneficial to shorten the total length of the optical system.

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

[0050] 0.477 < SD12 / SD21 < 0.710; (10)

[0051] Among them, SD12 represents the semi-aperture of the largest light-passing area on the image side of the first lens, and SD21 represents the semi-aperture of the largest light-passing area on the object side of the second lens. When the above condition formula (10) is satisfied, the light deflection can tend to be slow while reducing the head size, and the effects of maintaining the miniaturization of the system head and reducing the system sensitivity can be achieved.

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

[0053] 0.005 < AC2 / TTL < 0.028; (11)

[0054] Among them, AC2 represents the air gap on the optical axis from the second lens to the third lens, and TTL represents the overall optical length of the optical lens. When the above condition formula (11) is satisfied, by reasonably distributing the air gap on the optical axis from the second lens to the third lens, the light deflection from the second lens to the third lens can tend to be slow, effectively reducing the system sensitivity and improving the manufacturing yield.

[0055] In some embodiments, the optical lens satisfies the following condition formula:

[0056] 0.774 < (YR31 + YR32) / IH < 1.053; (12)

[0057] Among them, YR31 represents the vertical distance from the inflection point on the object side of the third lens to the optical axis, YR32 represents the vertical distance from the inflection point on the image side of the third lens to the optical axis, and IH represents the actual maximum semi-image height of the optical lens. When the above condition formula (12) is satisfied, the positions of the inflection points on the object side and the image side of the third lens can be reasonably restricted, which helps to strengthen the coma correction of the off-axis field of view and well converge the field curvature, improving the imaging quality.

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

[0059] 0.278 < (R21 - R22) / (R21 + R22) < 0.969; (13)

[0060] Among them, R21 represents the curvature radius of the object side of the second lens, and R22 represents the curvature radius of the image side of the second lens. When the above condition formula (13) is satisfied, by adjusting the surface shape of the object side and the image side of the second lens near the optical axis, the shape change of the second lens can be slowed down, the generation of stray light can be reduced, and the manufacturability of the lens can be improved.

[0061] In some embodiments, the object side surface of the first lens in the optical lens is convex. In other embodiments, the object side surface of the first lens in the optical lens is concave. Different combinations of surface types of the first lens can enable the system to achieve good imaging effects.

[0062] As an implementation, the first lens, the second lens, and the third lens can be combined with all-plastic aspherical lenses or with glass spherical lenses. To further improve the imaging quality of the system, in this application, the first lens to the third lens are all made of plastic aspherical lenses. Using aspherical lenses can effectively reduce costs, correct aberrations, and provide optical performance products with higher cost performance.

[0063] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0064] In each embodiment of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface type of the lens all satisfies the following equation:

[0065]

[0066] Where h is the perpendicular distance from a point on the aspherical surface to the optical axis, z is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic, and A 2i is the aspherical surface type coefficient of the 2i-th order.

[0067] First Embodiment

[0068] Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 sequentially includes, along the optical axis from the object side to the imaging surface S9, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, and a filter G1.

[0069] Among them, the first lens L1 has a positive optical power. The object side S1 of the first lens is convex, and the image side S2 of the first lens is convex. The second lens L2 has a positive optical power. The object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The third lens L3 has a negative optical power. The object side S5 of the third lens is convex near the optical axis and has at least one inflection point. The image side S6 of the third lens is concave near the optical axis and has at least one inflection point. The first lens L1, the second lens L2, and the third lens L3 are all plastic aspherical lenses. The object side of the filter G1 is S7, and the image side is S8.

[0070] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0071] Table 1

[0072]

[0073] In this embodiment, the aspherical parameters of each lens in the optical lens 100 are shown in Table 2.

[0074] Table 2

[0075] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> S1 3.72E+02 -4.91E-01 2.00E+00 -3.15E+01 S2 -1.23E+01 -9.55E-01 2.24E+00 1.21E+00 S3 7.30E-01 6.70E-02 -3.11E+00 2.52E+01 S4 -7.53E-01 8.64E-01 -1.70E+00 1.35E+00 S5 -8.08E+00 -5.28E-02 -7.86E-01 1.65E+00 S6 -3.61E+00 -2.89E-01 1.88E-01 -7.94E-02 Face number <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S1 2.35E+02 -1.01E+03 2.29E+03 -2.16E+03 S2 -1.90E+02 2.16E+03 -1.06E+04 1.92E+04 S3 -1.67E+02 6.21E+02 -8.28E+02 1.76E+02 S4 1.78E+00 -5.63E+00 3.54E-01 1.10E+01 S5 -1.95E+00 1.38E+00 -5.33E-01 8.27E-02 S6 5.42E-03 1.13E-02 -5.32E-03 7.39E-04

[0076] Please refer to Figure 2 、 Figure 3 and Figure 4 , which respectively show the F-Theta distortion curve graph, paraxial field curvature curve graph, and lateral chromatic aberration curve graph of the optical lens 100. As can be seen from Figure 2 , the optical distortion is controlled within ±2%, indicating that the distortion of the optical lens 100 is well corrected. As can be seen from Figure 3 , the field curvature is controlled within ±0.05 mm, indicating that the field curvature of the optical lens 100 is well corrected. As can be seen from Figure 4 , the lateral chromatic aberration at different wavelengths is controlled within ±3.2 microns, indicating that the lateral chromatic aberration of the optical lens 100 is well corrected. As can be seen from Figure 2 、 Figure 3 、 Figure 4 , the aberrations of the optical lens 100 are well balanced, and it has good optical imaging quality.

[0077] Second Embodiment

[0078] As Figure 5 shown, it is a schematic structural diagram of the optical lens 200 provided in this embodiment. The optical lens 200 in this embodiment is substantially the same as the above first embodiment, and the main difference lies in that: the object side S1 of the first lens of the optical lens 200 in this embodiment is concave near the optical axis, and there are differences in the curvature radius, aspherical coefficient, and thickness of each lens surface type.

[0079] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0080] Table 3

[0081]

[0082] In this embodiment, the aspheric parameters of each lens in the optical lens 200 are shown in Table 4.

[0083] Table 4

[0084] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> S1 0.00E+00 -4.34E-01 -6.48E-01 7.08E-01 S2 -2.77E+00 -3.23E-01 -1.31E+00 1.26E+01 S3 2.30E+01 -2.27E-01 7.69E-01 -7.30E+00 S4 -2.58E+00 -4.50E-01 -1.15E-01 -2.85E-01 S5 -1.29E+01 -4.11E-01 -1.53E-01 1.60E-01 S6 -3.80E+00 -3.14E-01 1.89E-01 -4.09E-02 Face number <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S1 9.36E+00 4.58E+01 -5.49E+02 1.07E+03 S2 -9.29E+00 -1.21E+02 -4.18E+02 9.80E+02 S3 1.03E+01 8.06E+01 -2.74E+02 2.60E+02 S4 -1.91E-01 2.68E-01 2.65E-01 1.32E+00 S5 1.64E-01 -4.97E-02 1.52E-01 -2.61E-01 S6 6.37E-04 -1.64E-03 -1.74E-04 3.39E-04

[0085] Please refer to Figure 6 、 Figure 7 and Figure 8 , which respectively show the F-Theta distortion curve graph, paraxial field curvature curve graph, and lateral chromatic aberration curve graph of the optical lens 200. It can be seen from Figure 6 that the optical distortion is controlled within ±1%, indicating that the distortion of the optical lens 200 is well corrected; it can be seen from Figure 7 that the field curvature is controlled within ±0.10 mm, indicating that the field curvature of the optical lens 200 is well corrected; it can be seen from Figure 8 that the lateral chromatic aberration at different wavelengths is controlled within ±3 microns, indicating that the lateral chromatic aberration of the optical lens 200 is well corrected; it can be seen from Figure 6 、 Figure 7 、 Figure 8 that the aberrations of the optical lens 200 are well balanced and it has good optical imaging quality.

[0086] Third Embodiment

[0087] As Figure 9 shown, it is a schematic structural diagram of the optical lens 300 provided in this embodiment. The optical lens 300 in this embodiment is substantially the same as the above-mentioned first embodiment, and the main differences are: the object side surface S1 of the first lens of the optical lens 300 in this embodiment is concave at the near optical axis, and there are differences in the curvature radius, aspheric coefficient, and thickness of each lens surface.

[0088] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0089] Table 5

[0090]

[0091]

[0092] In this embodiment, the aspherical parameters of each lens in the optical lens 300 are shown in Table 6.

[0093] Table 6

[0094] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> S1 0.00E+00 -7.67E-01 5.85E-01 -1.17E+01 S2 1.88E+00 -4.31E-01 -2.46E+00 1.92E+01 S3 1.87E+02 -1.36E-01 1.41E+00 -6.62E+00 S4 -2.73E+00 -2.30E-01 1.79E-02 -3.90E-02 S5 -2.87E+01 -3.02E-01 -2.15E-01 2.99E-01 S6 -3.90E+00 -2.10E-01 1.37E-01 -6.10E-02 Face number <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S1 1.15E+01 2.75E+02 -1.18E+03 8.15E+02 S2 -3.81E+01 -2.24E+02 2.87E+02 2.40E+03 S3 6.26E+00 7.51E+01 -2.42E+02 2.20E+02 S4 -1.33E-01 3.52E-01 1.24E-01 -4.88E-02 S5 -2.23E-01 -3.82E-01 9.72E-01 -5.21E-01 S6 1.66E-02 -1.81E-03 -1.85E-04 3.85E-05

[0095] Please refer to Figure 10 、 Figure 11 and Figure 12 , which respectively show the F-Theta distortion curve graph, paraxial field curvature curve graph, and lateral chromatic aberration curve graph of the optical lens 300. As can be seen from Figure 10 , the optical distortion is controlled within ±2.5%, indicating that the distortion of the optical lens 300 is well corrected; as can be seen from Figure 11 , the field curvature is controlled within ±0.05 mm, indicating that the field curvature of the optical lens 300 is well corrected; as can be seen from Figure 12 , the lateral chromatic aberration at different wavelengths is controlled within ±3 microns, indicating that the lateral chromatic aberration of the optical lens 300 is well corrected; as can be seen from Figure 10 、 Figure 11 、 Figure 12 , the aberrations of the optical lens 300 are well balanced, and it has good optical imaging quality.

[0096] Please refer to Table 7, which shows the optical characteristics corresponding to the optical lenses provided in the above three embodiments, including the maximum field of view angle 2θ, total optical length TTL, semi-image height IH, effective focal length f of the optical lens, and the relevant values corresponding to each of the foregoing conditional expressions.

[0097] Table 7

[0098] First embodiment Second embodiment Third embodiment 2θ (°) 108.000 104.956 104.956 TTL (mm) 2.732 2.517 2.708 IH (mm) 2.090 1.989 1.978 f (mm) 1.528 1.507 1.538 EPD 0.673 0.661 0.674 f1 (mm) 2.23 3.53 3.02 f2 (mm) 1.27 1.03 1.10 f3 (mm) -1.90 -1.33 -1.22 [Tan(θ) × f] / IH 1.006 0.986 1.012 IH / TTL 0.765 0.790 0.730 (R31 - R32) / (R31 + R32) 0.273 0.356 0.511 f / TTL 0.686 0.427 0.510 f1 / SAG11 -173.1 -177.6 -109.6 f / f1 0.686 0.427 0.510 CT2 / ET2 2.178 3.296 1.834 (CT1 + CT2 + AC1) / TTL 0.564 0.528 0.596 SD12 / SD21 0.691 0.530 0.541 AC2 / TTL 0.007 0.026 0.009 (YR31 + YR32) / IH 0.860 0.874 0.958 (R21 - R22) / (R21 + R22) 0.308 0.732 0.881

[0099] From the distortion curves, paraxial field curvature curves, and lateral chromatic aberration curve graphs of each of the above embodiments, it can be seen that the F-Theta distortion values of the optical lenses in each embodiment are within ±2.5%, the field curvature values are within ±0.10 mm, and the lateral chromatic aberration is within ±3.2 microns, indicating that the optical lenses provided in the embodiments of the present invention have the advantages of small volume, large field of view angle, and can maintain excellent optical distortion, and at the same time have good resolution.

[0100] In summary, the optical lens provided in the embodiment of the present invention adopts three plastic aspherical lenses with specific refractive powers, and through specific optical power distribution, the optical lens has the advantages of miniaturization and large field of view angle; at the same time, through reasonable surface shape matching, while the lens has a large field of view angle, it maintains excellent optical distortion, better meeting the use requirements of miniaturization, wide angle, and high imaging quality of portable electronic devices.

[0101] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. 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 invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0102] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. An optical lens, characterized in that, It sequentially includes from the object side to the imaging plane along the optical axis: A first lens with positive optical power, and the image side of the first lens is convex; A diaphragm; A second lens with positive optical power, the object side of the second lens is concave, and the image side of the second lens is convex; A third lens with negative optical power, the object side of the third lens is convex near the optical axis and has at least one inflection point, and the image side of the third lens is concave near the optical axis and has at least one inflection point; Wherein, the optical lens satisfies the following conditional expressions: 100° < 2θ < 118°; 0.888 < [Tan(θ) × f] / IH < 1.114; Wherein, θ represents half of the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual maximum semi-image height of the optical lens.

2. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 0.70 < IH / TTL < 0.82; Wherein, IH represents the actual maximum semi-image height of the optical lens, and TTL represents the overall optical length of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.246 < (R31 - R32) / (R31 + R32) < 0.562; Wherein, 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.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.385 < f / TTL < 0.755; Wherein, f represents the effective focal length of the optical lens, and TTL represents the overall optical length of the optical lens.

5. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: -195 < f1 / SAG11 < -98; Wherein, f1 represents the effective focal length of the first lens, and SAG11 represents the sagitta at the maximum aperture of the object side of the first lens.

6. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 1.65 < CT2 / ET2 < 3.625; Wherein, CT2 represents the thickness of the second lens on the optical axis, and ET2 represents the edge thickness of the second lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.49 < (CT1 + CT2 + AC1) / TTL < 0.62; Wherein, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, AC1 represents the air gap on the optical axis from the first lens to the second lens, and TTL represents the overall optical length of the optical lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.477 < SD12 / SD21 < 0.710; Wherein, SD12 represents the semi-aperture of the maximum light-passing area of the image side of the first lens, and SD21 represents the semi-aperture of the maximum light-passing area of the object side of the second lens.

9. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 0.005 < AC2 / TTL < 0.028; Wherein, AC2 represents the air gap on the optical axis from the second lens to the third lens, and TTL represents the overall optical length of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.774 < (YR31 + YR32) / IH < 1.053; Among them, YR31 represents the perpendicular distance from the inflection point on the object side of the third lens to the optical axis, YR32 represents the perpendicular distance from the inflection point on the image side of the third lens to the optical axis, and IH represents the actual maximum semi-image height of the optical lens.

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