Optical lens and electronic equipment

Abstract

The invention belongs to the technical field of optics, and particularly relates to an optical lens and electronic equipment. The optical lens comprises an aperture diaphragm and a plurality of lenses which are sequentially and coaxially arranged from an object side to an image side, the side, facing the object side, of the aperture diaphragm is provided with the plurality of lenses, and a diaphragm front lens group is formed; one side, facing the image side, of the aperture diaphragm is provided with a plurality of lenses to form a diaphragm rear lens group; the number of the lenses of the diaphragm front lens group is the same as that of the lenses of the diaphragm rear lens group, and distortion is offset symmetrically, so that reduction of optical distortion of the optical lens is facilitated; the diaphragm front lens group has negative focal power, the diaphragm rear lens group has positive focal power, the diaphragm front lens group and the diaphragm rear lens group form aberration compensation, and the imaging performance of the optical lens is improved. The lens closest to the object side has the positive focal power so as to converge off-axis light beams with a large angle, the large field angle of the optical lens is achieved, meanwhile, the clear aperture of a light path is reduced, and then miniaturization of the light path structure is achieved.

Description

Optical lenses and electronic equipment

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on July 14, 2023, with application number 202310871488.4 and invention name “Optical lens and electronic device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of optical technology, and in particular to an optical lens and an electronic device. Background Art

[0003] With the development of image processing and computer technology, machine vision technology has been widely used due to its advantages such as high precision, fast speed, and high stability. Among them, optical lenses are an important component. The design of optical lenses directly affects the image quality, and the image quality directly affects the operating speed and accuracy of the camera.

[0004] In related technologies, the relative illumination of an optical lens directly affects the uniformity of image brightness. A higher relative illumination of an optical lens results in a more consistent image brightness distribution, eliminating the need for HDR (High-Dynamic Range) processing and improving capture speed.

[0005] However, existing optical lenses cannot simultaneously meet the requirements of clear imaging with a large field of view and high relative illumination. There is an obvious lack of illumination at the edge of the field of view, resulting in a large difference in brightness between the middle and edges of the image. Technical Solutions

[0006] The present disclosure provides an optical lens and electronic equipment, which have a large field-of-view imaging capability, high resolution and low distortion optical performance, high illumination uniformity across the entire field of view, and low cost.

[0007] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] A first aspect of the present disclosure provides an optical lens, comprising an aperture stop and a plurality of lenses coaxially arranged in sequence from the object side to the image side, wherein the aperture stop has a plurality of lenses on the side facing the object side, forming an aperture front lens group; the aperture stop has a plurality of lenses on the side facing the image side, forming an aperture rear lens group; the number of lenses in the aperture front lens group is the same as the number of lenses in the aperture rear lens group; the aperture front lens group has negative optical power, and the aperture rear lens group has positive optical power; the lens closest to the object side has positive optical power.

[0009] Compared with the prior art, the optical lens provided by the first aspect of the present disclosure has the following advantages:

[0010] The optical lens disclosed herein comprises an aperture stop and multiple lenses coaxially arranged from the object side to the image side. The aperture stop has multiple lenses on the side facing the object side, forming a front lens group; the aperture stop has multiple lenses on the side facing the image side, forming a rear lens group. The number of lenses in the front lens group and the rear lens group are the same, symmetrically offsetting distortion, thereby facilitating reduction of optical distortion in the optical lens. The front lens group has negative focal power, while the rear lens group has positive focal power. The front and rear lens groups compensate for aberrations, improving the imaging performance of the optical lens. The lens closest to the object side has positive focal power to converge off-axis light beams at larger angles, achieving a wide field of view for the optical lens, while reducing the clear aperture of the optical path, thereby miniaturizing the optical path structure. The optical lens disclosed herein provides clear imaging within a wide range, while exhibiting both high resolution and low distortion. It also has high relative illumination, resulting in more uniform illumination across the image plane.

[0011] As an improvement to the above-mentioned optical lens disclosed in the present invention, among the multiple lenses, the two lenses closest to the image side have positive optical power.

[0012] As an improvement to the above-mentioned optical lens disclosed in the present invention, the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens coaxially arranged in sequence from the object side to the image side; the first lens is the lens closest to the object side; the eleventh lens and the twelfth lens are the two lenses closest to the image side; the aperture stop is located between the sixth lens and the seventh lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens form the aperture front lens group, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens form the aperture rear lens group.

[0013] As an improvement to the above optical lens disclosed in the present invention, the second lens and the third lens respectively have negative optical power; and the fourth lens has positive optical power.

[0014] As an improvement to the above optical lens disclosed herein, the fifth lens and the sixth lens are a cemented lens group, and the difference between the Abbe number V5 of the fifth lens and the Abbe number V6 of the sixth lens is greater than 15.

[0015] As an improvement to the above optical lens disclosed in the present invention, a surface of the seventh lens facing the aperture stop is a concave surface.

[0016] As an improvement to the above optical lens disclosed herein, the ninth lens and the tenth lens are a cemented lens group, and the difference between the Abbe number V9 of the ninth lens and the Abbe number V10 of the tenth lens is greater than 45.

[0017] As an improvement to the above-mentioned optical lens of the present disclosure, the first lens, the second lens, and the third lens form a first lens group, and the focal length fa of the first lens group satisfies -25mm≤fa≤-5mm; the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens form a second lens group, and the focal length fb of the second lens group satisfies 5mm≤fb≤25mm; the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens form a third lens group, and the focal length fc of the third lens group satisfies 5mm≤fc≤25mm.

[0018] As an improvement to the above-mentioned optical lens disclosed in the present invention, the focal length fa of the first lens group satisfies -15mm≤fa≤-5mm; the focal length fb of the second lens group satisfies 10mm≤fb≤20mm; and the focal length fc of the third lens group satisfies 10mm≤fc≤20mm.

[0019] As an improvement to the above-mentioned optical lens disclosed in the present invention, the focal length fa of the first lens group and the focal length f of the optical lens satisfy 0.7<|fa / f|<5; the focal length fb of the second lens group and the focal length f of the optical lens satisfy 1.5<fb / f<6; the focal length fc of the third lens group and the focal length f of the optical lens satisfy 1.5<fb / f<6.

[0020] As an improvement to the above-mentioned optical lens disclosed in the present invention, the first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a convex-concave lens, the fourth lens is a convex-concave lens, the fifth lens is a convex-concave lens, the sixth lens is a convex-concave lens, the seventh lens is a convex-concave lens, the eighth lens is a convex-concave lens, the ninth lens is a biconcave lens, the tenth lens is a biconvex lens, the eleventh lens is a plano-convex lens, and the twelfth lens is a convex-concave lens.

[0021] As an improvement to the above-mentioned optical lens disclosed in the present invention, the curvature radius R11 of the incident surface of the first lens satisfies 15mm≤R11≤25mm, and the curvature radius R12 of the exit surface satisfies 30mm≤R12≤40mm; the curvature radius R21 of the incident surface of the second lens satisfies 10mm≤R21≤20mm, and the curvature radius R22 of the exit surface satisfies 5mm≤R22≤15mm; the curvature radius R31 of the incident surface of the third lens satisfies 15mm≤R31≤25mm, and the curvature radius R32 of the exit surface satisfies 5mm≤R32 ≤15mm; the curvature radius R41 of the incident surface of the fourth lens satisfies -110mm≤R41≤-100mm, and the curvature radius R42 of the exit surface satisfies -30mm≤R42≤-20mm; the curvature radius R51 of the incident surface of the fifth lens satisfies 10mm≤R51≤20mm, and the curvature radius R52 of the exit surface satisfies 170mm≤R52≤180mm; the curvature radius R61 of the incident surface of the sixth lens satisfies 170mm≤R61≤180mm, and the curvature radius R62 of the exit surface satisfies 5mm≤R62 ≤15mm; the curvature radius R71 of the incident surface of the seventh lens satisfies -25mm≤R71≤-15mm, and the curvature radius R72 of the exit surface satisfies -15mm≤R72≤-5mm; the curvature radius R81 of the incident surface of the eighth lens satisfies 10mm≤R81≤20mm, and the curvature radius R82 of the exit surface satisfies 30mm≤R82≤40mm; the curvature radius R91 of the incident surface of the ninth lens satisfies -75mm≤R91≤-65mm, and the curvature radius R92 of the exit surface satisfies 10mm≤R92≤20mm m; the curvature radius R101 of the incident surface of the tenth lens satisfies 10mm≤R101≤20mm, and the curvature radius R102 of the exit surface satisfies -20mm≤R102≤-10mm; the curvature radius R111 of the incident surface of the eleventh lens satisfies infinity, and the curvature radius R112 of the exit surface satisfies -25mm≤R112≤-15mm; the curvature radius R121 of the incident surface of the twelfth lens satisfies 15mm≤R121≤25mm, and the curvature radius R122 of the exit surface satisfies 65mm≤R122≤75mm.

[0022] As an improvement to the above-mentioned optical lens disclosed in the present invention, the curvature radius R51 of the incident surface of the fifth lens and the curvature radius R62 of the exit surface of the sixth lens satisfy 0.5<R51 / R62<5; the curvature radius R91 of the incident surface of the ninth lens and the curvature radius R102 of the exit surface of the tenth lens satisfy 2.5<R91 / R102<7.5.

[0023] As an improvement to the above-mentioned optical lens of the present invention, the center thickness GT1 of the first lens satisfies 3mm≤GT1≤6mm; the center thickness GT2 of the second lens satisfies 1mm≤GT2≤4mm; the center thickness GT3 of the third lens satisfies 1mm≤GT3≤4mm; the center thickness GT4 of the fourth lens satisfies 2mm≤GT4≤5mm; the center thickness GT5 of the fifth lens satisfies 1mm≤GT5≤4mm; the center thickness GT6 of the sixth lens satisfies 1mm≤GT6≤4mm; the center thickness GT7 of the seventh lens satisfies 1mm≤GT7≤4mm; the center thickness GT8 of the eighth lens satisfies 3mm≤GT≤6mm; the center thickness GT9 of the ninth lens satisfies 1mm≤GT9≤4mm; the center thickness GT10 of the tenth lens satisfies 2mm≤GT10≤5mm; the center thickness GT11 of the eleventh lens satisfies 1mm≤GT1≤4mm; and the center thickness GT12 of the twelfth lens satisfies 2mm≤GT1≤5mm.

[0024] As an improvement to the above-mentioned optical lens disclosed in the present invention, the center thickness GT5 of the fifth lens and the center thickness GT6 of the sixth lens satisfy 0.2<GT5 / GT6<4; the center thickness GT9 of the ninth lens and the center thickness GT10 of the tenth lens satisfy 0.2<GT5 / GT6<2.

[0025] As an improvement to the above-mentioned optical lens disclosed in the present invention, an air spacing distance AT1 between the first lens and the second lens along the optical axis satisfies 0mm≤AT1≤2mm; an air spacing distance AT2 between the second lens and the third lens along the optical axis satisfies 3mm≤AT2≤5mm; an air spacing distance AT3 between the third lens and the fourth lens along the optical axis satisfies 3mm≤AT3≤5mm; an air spacing distance AT4 between the fourth lens and the fifth lens along the optical axis satisfies 0mm≤AT4≤2mm; an air spacing distance AT5 between the sixth lens and the aperture stop along the optical axis satisfies 3mm≤AT5≤5mm; and an air spacing distance AT6 between the aperture stop and the seventh lens along the optical axis satisfies 3mm≤AT6≤5mm. An air spacing distance AT6 along the optical axis satisfies 0mm≤AT6≤2mm; an air spacing distance AT7 along the optical axis between the seventh lens and the eighth lens satisfies 0mm≤AT7≤2mm; an air spacing distance AT8 along the optical axis between the eighth lens and the ninth lens satisfies 2mm≤AT8≤4mm; an air spacing distance AT9 along the optical axis between the tenth lens and the eleventh lens satisfies 0mm≤AT9≤2mm; an air spacing distance AT10 along the optical axis between the eleventh lens and the twelfth lens satisfies 0mm≤AT10≤2mm; and an air spacing distance BFL along the optical axis between the twelfth lens and the image plane satisfies 8mm≤BFL≤10mm.

[0026] As an improvement to the above optical lens disclosed herein, an air distance AT5 between the sixth lens and the aperture stop along the optical axis and an air distance AT6 between the aperture stop and the seventh lens along the optical axis satisfy 3<AT5+AT6<7.

[0027] As an improvement to the above optical lens disclosed in the present invention, the air spacing distance BFL between the twelfth lens and the image plane along the optical axis and the total optical length TTL of the optical lens satisfy 0.13<BFL / TTL<0.25.

[0028] As an improvement to the above optical lens disclosed herein, the focal length f1 of the first lens satisfies 35mm≤f1≤45mm; the focal length f2 of the second lens satisfies -20mm≤f2≤-10mm; the focal length f3 of the third lens satisfies -20mm≤f3≤-10mm; the focal length f4 of the fourth lens satisfies 10mm≤f4≤20mm; the focal length f5 of the fifth lens satisfies 15mm≤f5≤25mm; the focal length f6 of the sixth lens satisfies -20mm≤f6≤ -10mm; the focal length f7 of the seventh lens satisfies 15mm≤f7≤25mm; the focal length f8 of the eighth lens satisfies 25mm≤f8≤35mm; the focal length f9 of the ninth lens satisfies -25mm≤f9≤-15mm; the focal length f10 of the tenth lens satisfies 130mm≤f10≤140mm; the focal length f11 of the eleventh lens satisfies 20mm≤f11≤30mm; and the focal length f12 of the twelfth lens satisfies 20mm≤f12≤30mm.

[0029] As an improvement to the above-mentioned optical lens of the present invention, the focal length f1 of the first lens satisfies 5.5<f1 / f<11.5 with the focal length f of the optical lens; the focal length f2 of the second lens satisfies 1.5<|f2 / f|<5 with the focal length f of the optical lens; the focal length f3 of the third lens satisfies 1.5<|f3 / f|<5 with the focal length f of the optical lens; the focal length f4 of the fourth lens satisfies 1.5<f4 / f<5 with the focal length f of the optical lens; the focal length f5 of the fifth lens satisfies 2.5<f5 / f<6.5 with the focal length f6 of the sixth lens satisfies 1.5<|f 6 / f|<5; the focal length f7 of the seventh lens satisfies 2.5<f7 / f<6.5 with the focal length f of the optical lens; the focal length f8 of the eighth lens satisfies 4<f8 / f<9 with the focal length f of the optical lens; the focal length f9 of the ninth lens satisfies 2.5<|f9 / f|<6.5 with the focal length f9 of the ninth lens; the focal length f10 of the tenth lens satisfies 21.5<f10 / f<35 with the focal length f of the optical lens; the focal length f11 of the eleventh lens satisfies 3<f11 / f<7.5 with the focal length f12 of the twelfth lens satisfies 3<f12 / f<7.5 with the focal length f12 of the optical lens.

[0030] As an improvement to the above-mentioned optical lens disclosed in the present invention, the refractive index N1 of the first lens satisfies 1.9≤N1≤2.0, and the Abbe number V1 satisfies 15≤V1≤20; the refractive index N2 of the second lens satisfies 1.9≤N2≤2.0, and the Abbe number V2 satisfies 30≤V2≤35; the refractive index N3 of the third lens satisfies 1.8≤N3≤1.9, and the Abbe number V3 satisfies 35≤V3≤40; the refractive index N4 of the fourth lens satisfies 1.6≤N4≤1.7, and the Abbe number V4 satisfies 55≤V4≤60; the refractive index N5 of the fifth lens satisfies 1.6≤N5≤1.7, and the Abbe number V5 satisfies 55≤V5≤60; the refractive index N6 of the sixth lens satisfies 1.5≤N6≤1.6, and the Abbe number V6 satisfies 40≤V6≤4 5; the refractive index N7 of the seventh lens satisfies 1.6≤N7≤1.7, and the Abbe number V7 satisfies 55≤V7≤60; the refractive index N8 of the eighth lens satisfies 1.7≤N8≤1.8, and the Abbe number V8 satisfies 25≤V8≤30; the refractive index N9 of the ninth lens satisfies 1.9≤N9≤2.0, and the Abbe number V9 satisfies 25≤V9≤30; the refractive index N10 of the tenth lens satisfies 1.4≤N10≤1.5, and the Abbe number V10 satisfies 70≤V10≤75; the refractive index N11 of the eleventh lens satisfies 1.8≤N11≤1.9, and the Abbe number V11 satisfies 35≤V11≤40; the refractive index N12 of the twelfth lens satisfies 1.8≤N12≤1.9, and the Abbe number V12 satisfies 40≤V12≤45.

[0031] As an improvement of the above-mentioned optical lens disclosed in the present invention, the focal length f of the optical lens satisfies 3mm≤f≤8mm; the aperture number Fno of the optical lens satisfies F1.2≤Fno≤F16; the field of view angle FOV of the optical lens satisfies 70°≤FOV≤120°; and the image side target surface size IMG of the optical lens satisfies 8mm≤IMG≤16mm.

[0032] As an improvement of the above-mentioned optical lens disclosed in the present invention, the focal length f of the optical lens satisfies 4mm≤f≤6mm; the aperture number Fno of the optical lens satisfies F1.2≤Fno≤F16; the field of view angle FOV of the optical lens satisfies 75°≤FOV≤90°; the image side target surface size IMG of the optical lens satisfies 8mm≤IMG≤11mm; the working band WL of the optical lens satisfies 600nm≤WL≤650nm; and the total optical length TTL of the optical lens satisfies 45mm≤TTL≤55mm.

[0033] As an improvement of the above-mentioned optical lens disclosed in the present invention, the focal length f of the optical lens and the image-side target surface size IMG of the optical lens satisfy 0.2<f / IMG<0.9.

[0034] As an improvement to the above optical lens disclosed in the present invention, all lenses of the optical lens are spherical lenses.

[0035] As an improvement to the above-mentioned optical lens disclosed in the present invention, all lenses of the optical lens are glass lenses.

[0036] As an improvement of the above-mentioned optical lens disclosed in the present invention, the field curvature value of the optical lens is greater than -0.05mm and less than 0.05mm, the distortion of the optical lens is less than 0.5%; and the contrast of the MTF value of the optical lens at 200lp / mm is greater than 0.3.

[0037] As an improvement of the above-mentioned optical lens disclosed in the present invention, the relative illumination of the full field of view of the optical lens is greater than 78%.

[0038] A second aspect of the present disclosure provides an electronic device, which includes the optical lens described in the first aspect.

[0039] The electronic device provided in the second aspect of the present disclosure includes the optical lens described in the first aspect, so the electronic device provided in the second aspect of the present disclosure also has the same advantages as the optical lens described in the first aspect.

[0040] As an improvement to the above-mentioned electronic device disclosed in the present invention, the electronic device is a camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0042] FIG1 is a schematic structural diagram of an optical lens provided in an embodiment of the present disclosure;

[0043] FIG2 is a diagram of field curvature of an optical lens provided by an embodiment of the present disclosure;

[0044] FIG3 is a distortion diagram of an optical lens provided by an embodiment of the present disclosure;

[0045] FIG4 is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure;

[0046] FIG5 is a relative illumination curve diagram of an optical lens provided by an embodiment of the present disclosure;

[0047] Figure 6 is a real shot of a lens with a relative illumination of 30%;

[0048] FIG7 is a real picture of the optical lens provided by an embodiment of the present disclosure at a relative illumination of 78%;

[0049] FIG8 is a diagram of field curvature of the optical lens provided in Example 1 of the present disclosure;

[0050] FIG9 is a distortion diagram of the optical lens provided in Example 1 of the present disclosure;

[0051] FIG10 is an MTF curve diagram of the optical lens provided in Example 1 of the present disclosure;

[0052] FIG11 is a relative illumination curve diagram of the optical lens provided in Example 1 of the present disclosure;

[0053] FIG12 is a field curvature diagram of the optical lens provided in Example 2 of the present disclosure;

[0054] FIG13 is a distortion diagram of the optical lens provided in Example 2 of the present disclosure;

[0055] FIG14 is an MTF curve diagram of the optical lens provided in Example 2 of the present disclosure;

[0056] FIG15 is a relative illumination curve diagram of the optical lens provided in Example 2 of the present disclosure;

[0057] FIG16 is a diagram of field curvature of the optical lens provided in Example 3 of the present disclosure;

[0058] FIG17 is a distortion diagram of the optical lens provided in Example 3 of the present disclosure;

[0059] FIG18 is an MTF curve diagram of the optical lens provided in Example 3 of the present disclosure;

[0060] FIG19 is a relative illumination curve diagram of the optical lens provided in Example 3 of the present disclosure. Modes for Carrying Out the Invention

[0061] With the development of image processing and computer technology, machine vision technology has been widely used due to its advantages such as high precision, fast speed, and high stability. Among them, optical lenses are an important component. The design of optical lenses directly affects the image quality, and the image quality directly affects the operating speed and accuracy of the camera.

[0062] Image brightness distribution is influenced by both the illumination distribution and the relative illumination of the optical lens. For example, in a 3D structured light projection module, the illuminated image is typically bright in the center and dark at the edges. The relative illumination of the optical lens directly impacts image brightness uniformity. A higher relative illumination of the optical lens results in a more consistent image brightness distribution, enabling the use of a consistent exposure time to capture the target without requiring HDR (High-Dynamic Range) processing, thus improving capture speed.

[0063] However, existing optical lenses cannot simultaneously meet the requirements of clear imaging with a large field of view and high relative illumination. There is an obvious lack of illumination at the edge of the field of view, resulting in a large difference in brightness between the middle and edges of the image.

[0064] In some lenses, these requirements are achieved through complex optical system structures and aspherical lenses. However, due to the high requirements for lens processing and assembly, the actual imaging performance of the finished lens can fall far short of the designed performance. Furthermore, aspherical glass lenses incur high costs, leading to limited mass production. Furthermore, aspherical plastic lenses suffer from poor stability and high-temperature resistance, making them unsuitable for the required application environments.

[0065] In view of this, the embodiments of the present disclosure provide an optical lens that can meet the requirements of clear imaging within a sufficiently large field of view angle, while having optical performance of high resolution and low distortion, and high relative illumination; and all lenses use full-spherical glass material to ensure low cost.

[0066] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0067] FIG1 is a schematic structural diagram of an optical lens provided in an embodiment of the present disclosure.

[0068] In conjunction with Figure 1, an embodiment of the present disclosure provides an optical lens, which includes: an aperture stop 10 and a plurality of lenses coaxially arranged in sequence from the object side to the image side. Based on the direction in Figure 1, the left side is the object side and the right side is the image side. The aperture stop 10 has a plurality of lenses on the side facing the object side, forming an aperture front lens group; the aperture stop 10 has a plurality of lenses on the side facing the image side, forming an aperture rear lens group. In this way, there are multiple lenses on both sides of the aperture stop 10. The number of lenses in the aperture front lens group is the same as the number of lenses in the aperture rear lens group, so that the number of lenses of the entire optical lens is symmetrical about the aperture stop 10, symmetrically offsetting the distortion, thereby helping to reduce the optical distortion of the optical lens.

[0069] The aperture front lens group of the embodiment of the present disclosure has negative optical focal length, and the aperture rear lens group has positive optical focal length. The aperture front lens group and the aperture rear lens group form aberration compensation to improve the imaging performance of the optical lens.

[0070] The lens closest to the object side has positive optical power, which can converge off-axis light beams with a larger angle to achieve a large field of view of the optical lens, while reducing the aperture of the optical path, thereby achieving miniaturization of the optical path structure.

[0071] Among the multiple lenses of an optical lens, the two lenses closest to the image side have positive optical power, which is beneficial to reducing the incident angle of the main light of the edge field of view on the image plane, so that the imaging ability of the main light of the edge field of view is close to the imaging ability of the main light of the central field of view, thereby making the illumination difference between the edge field of view and the central field of view smaller, which is beneficial to improving the relative illumination and thus improving the uniformity of the image plane illumination; at the same time, it is beneficial to balance the field curvature and off-axis aberrations.

[0072] Among the multiple lenses in the aperture front lens group, there is a first group of cemented lenses. The difference in Abbe numbers between the two lenses in the first group of cemented lenses is greater than 15, which can eliminate chromatic aberration generated in the early light path and improve the imaging performance of the optical lens.

[0073] Among the multiple lenses of the rear lens group of the aperture, there is a second group of cemented lenses. The difference in Abbe numbers between the two lenses of the second group of cemented lenses is greater than 45, which is conducive to chromatic aberration correction of the light beam converging on the image plane.

[0074] The lens closest to the aperture stop 10 and located on the image side of the aperture stop 10 has a very small air gap between it and the aperture stop 10, and the surface of the lens facing the aperture stop 10 is concave, which is beneficial to reducing the angle of light incident on the lens surface and correcting the aberration of the optical lens.

[0075] Continuing with Figure 1, the multiple lenses of the optical lens of the present embodiment are divided into a first lens group 1, a second lens group 2, and a third lens group 3. The first lens group 1, the second lens group 2, and the third lens group 3 are arranged in order from the object side to the image side. The first lens group 1, the second lens group 2, and the third lens group 3 each include at least one lens, which may include a doublet of a separated lens or a cemented lens. These lenses may be entirely spherical lenses, entirely aspherical lenses, or a combination of spherical and aspherical lenses.

[0076] All lenses in the embodiments of the present disclosure are spherical lenses, which are easy to process and have low cost.

[0077] Lenses can be made of colorless optical glass or optical plastic. Optical plastic offers low mass production costs, easy processing of aspheric surfaces, and lightweight properties. Optical glass offers stable mechanical and thermal properties, and by combining different refractive indices and Abbe numbers, chromatic aberration can be eliminated, improving image quality. Industrial robots operate in diverse environments and require high ambient temperature stability.

[0078] All lenses in the embodiments of the present disclosure are glass lenses. Compared with plastic materials, glass materials have higher transmittance and better imaging effects. In addition, the physical and chemical stability of glass materials is better than that of plastic materials, and they can better adapt to various environments, thereby extending the service life of optical lenses.

[0079] In the embodiment of the present disclosure, the parameters of the optical lens are shown in Table 1.

[0080] Table 1 Parameters of optical lens

[0081]

[0082] It should be noted that the above parameter ranges include endpoint values. For example, the focal length f of the optical lens satisfies 3mm≤f≤8mm. Therefore, the optical lens of the embodiment of the present disclosure is a short-focus lens with a large field of view and high resolution.

[0083] Table 1 above introduces the overall performance parameters of the optical lens. The performance parameters of the three lens groups are shown in Table 2. The axial spacing in Table 2 refers to the spacing along the optical axis.

[0084] Table 2 Parameters of each lens group of the optical lens

[0085]

[0086] The axial spacing between two lens groups refers to the axial spacing along the optical axis between the two closest lenses in the two adjacent lens groups. The axial spacing d12 between the first lens group 1 and the second lens group 2 satisfies 2mm≤d12≤5mm. This means that the spacing d12 along the optical axis between the center of the exit surface of the lens closest to the second lens group 2 in the first lens group 1 and the center of the incident surface of the lens closest to the first lens group 1 in the second lens group 2 satisfies 2mm≤d12≤5mm. The axial spacing d23 between the second lens group 2 and the third lens group 3 satisfies 1mm≤d23≤4mm. This means that the spacing d23 along the optical axis between the center of the exit surface of the lens closest to the third lens group 3 in the second lens group 2 and the center of the incident surface of the lens closest to the second lens group 2 in the third lens group 3 satisfies 1mm≤d23≤4mm.

[0087] The specific lens structure of the optical lens according to the embodiment of the present disclosure is described in detail below with reference to FIG. 1 .

[0088] The multiple lenses of the optical lens of the embodiment of the present disclosure are composed of a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a tenth lens G10, an eleventh lens G11 and a twelfth lens G12 which are coaxially arranged in sequence from the object side to the image side.

[0089] The aperture stop 10 is located between the sixth lens element G6 and the seventh lens element G7. The first lens element G1, the second lens element G2, the third lens element G3, the fourth lens element G4, the fifth lens element G5 and the sixth lens element G6 form the aperture front lens group. The seventh lens element G7, the eighth lens element G8, the ninth lens element G9, the tenth lens element G10, the eleventh lens element G11 and the twelfth lens element G12 form the aperture rear lens group.

[0090] The first lens G1, the second lens G2 and the third lens G3 form a first lens group 1; the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7 and the eighth lens G8 form a second lens group 2; the ninth lens G9, the tenth lens G10, the eleventh lens G11 and the twelfth lens G12 form a third lens group 3.

[0091] The first lens G1 is the lens closest to the object side. As such, the first lens G1 has positive refractive power and can converge off-axis light beams at a larger angle to achieve a large field of view of the optical lens while reducing the aperture of the optical path, thereby miniaturizing the optical path structure.

[0092] The second lens G2 and the third lens G3 each have negative optical power. Combined with the positive optical power of the first lens G1, they can quickly deflect the light beam angle and reduce the angle between the light beam and the optical axis. The fourth lens G4 has positive optical power, which facilitates beam expansion and increases the divergence angle of the light, thereby increasing the amount of light reaching the image plane and enabling the optical lens to meet the requirements of large target areas. The fourth lens of the disclosed embodiment has a high Abbe number, allowing it to directly correct chromatic aberration of the imaging beam of the first lens group 1.

[0093] The fifth lens element G5 and the sixth lens element G6 are a cemented lens group located on the object-facing side of the aperture stop 10, forming the first cemented lens group of the optical lens. The difference in Abbe numbers between the fifth lens element G5 and the sixth lens element G6 is greater than 15, which eliminates chromatic aberration generated in the initial optical path and improves the imaging performance of the optical lens.

[0094] The seventh lens element G7 is closest to the aperture stop 10 and is located on the image side of the aperture stop 10. The surface of the seventh lens element G7 facing the aperture stop 10 is concave, and the axial air gap between the seventh lens element G7 and the aperture stop 10 is very small, which helps to reduce the angle at which light enters the lens surface and correct optical aberrations.

[0095] The eighth lens G8 is made of a material with a small Abbe number, which can directly reduce the difference in the convergence point positions between different wavelengths and reduce axial chromatic aberration.

[0096] The ninth lens element G9 and the tenth lens element G10 are cemented together and located on the image-facing side of the aperture stop 10, forming the second cemented lens group in the optical lens. The difference between the Abbe numbers V9 and V10 of the ninth lens element G9 and the tenth lens element G10 is greater than 45, enabling chromatic aberration correction of the light beam converging on the image plane.

[0097] The eleventh lens G11 and the twelfth lens G12 are the two lenses closest to the image side. As such, the eleventh lens G11 and the twelfth lens G12 have positive refractive power, which helps reduce the angle of incidence of the principal ray of the peripheral field of view on the image plane, so that the imaging power of the principal ray of the peripheral field of view is close to that of the principal ray of the central field of view, thereby reducing the difference in illumination between the peripheral field of view and the central field of view, which helps improve the relative illumination and thus improve the uniformity of the illumination on the image plane. At the same time, it helps balance field curvature and off-axis aberrations.

[0098] The embodiment of the present disclosure can effectively balance and process various aberrations through the above-mentioned lens combination structure, thereby improving the imaging performance of the optical system.

[0099] The optical lens disclosed herein does not set vignetting during the design process, so that as much light as possible from the edge of the field of view passes through the lens and reaches the image plane, thereby enabling the lens to obtain a higher relative illumination and ensuring the uniformity of the imaging picture.

[0100] Each lens or lens assembly in the disclosed embodiments has a unique functional focus, resulting in superior performance. Each lens has a reasonable power distribution and material combination. The following details the performance parameters of each lens.

[0101] Continuing with Figure 1 , the first lens G1 is a convex-concave lens, the second lens G2 is a convex-concave lens, the third lens G3 is a convex-concave lens, the fourth lens G4 is a convex-concave lens, the fifth lens G5 is a convex-concave lens, the sixth lens G6 is a convex-concave lens, the seventh lens G7 is a convex-concave lens, the eighth lens G8 is a convex-concave lens, the ninth lens G9 is a biconcave lens, the tenth lens G10 is a biconvex lens, the eleventh lens G11 is a plano-convex lens, and the twelfth lens G12 is a convex-concave lens. While ensuring the optical path size and volume of the lens, the lenses of the disclosed embodiments have a simple structure, good machinability, and are easy to process, which helps reduce costs. Example 1

[0102] In some possible embodiments, the focal length f of the optical lens satisfies 4mm≤f≤6mm; the aperture number Fno of the optical lens satisfies F1.2≤Fno≤F16; the field of view angle FOV of the optical lens satisfies 75°≤FOV≤90°; the image side target surface size IMG of the optical lens satisfies 8mm≤IMG≤11mm; the working band WL of the optical lens satisfies 600nm≤WL≤650nm; and the total optical length TTL of the optical lens satisfies 45mm≤TTL≤55mm.

[0103] The focal length f of the optical lens and the image side target surface size IMG of the optical lens satisfy 0.2<f / IMG<0.9.

[0104] The focal length fa of the first lens group 1 satisfies -15 mm ≤ fa ≤ -5 mm; the focal length fb of the second lens group 2 satisfies 10 mm ≤ fb ≤ 20 mm; and the focal length fc of the third lens group 3 satisfies 10 mm ≤ fc ≤ 20 mm.

[0105] The focal length fa of the first lens group 1 and the focal length f of the optical lens satisfy 0.7<|fa / f|<5; the focal length fb of the second lens group 2 and the focal length f of the optical lens satisfy 1.5<fb / f<6; the focal length fc of the third lens group 3 and the focal length f of the optical lens satisfy 1.5<fb / f<6.

[0106] The curvature radius R11 of the incident surface of the first lens G1 satisfies 15mm≤R11≤25mm, and the curvature radius R12 of the exit surface satisfies 30mm≤R12≤40mm; the curvature radius R21 of the incident surface of the second lens G2 satisfies 10mm≤R21≤20mm, and the curvature radius R22 of the exit surface satisfies 5mm≤R22≤15mm; the curvature radius R31 of the incident surface of the third lens G3 satisfies 15mm≤R31≤25mm, and the curvature radius R32 of the exit surface satisfies 5mm≤R32≤15mm; the incident surface of the fourth lens G4 satisfies The curvature radius R41 of the incident surface satisfies -110mm≤R41≤-100mm, and the curvature radius R42 of the exit surface satisfies -30mm≤R42≤-20mm; the curvature radius R51 of the incident surface of the fifth lens G5 satisfies 10mm≤R51≤20mm, and the curvature radius R52 of the exit surface satisfies 170mm≤R52≤180mm; the curvature radius R61 of the incident surface of the sixth lens G6 satisfies 170mm≤R61≤180mm, and the curvature radius R62 of the exit surface satisfies 5mm≤R62≤15mm; the curvature radius R62 of the incident surface of the seventh lens G6 satisfies 170mm≤R61≤180mm, and the curvature radius R62 of the exit surface satisfies 5mm≤R62≤15mm; The curvature radius R71 of the incident surface of G7 satisfies -25mm≤R71≤-15mm, and the curvature radius R72 of the exit surface satisfies -15mm≤R72≤-5mm; the curvature radius R81 of the incident surface of the eighth lens G8 satisfies 10mm≤R81≤20mm, and the curvature radius R82 of the exit surface satisfies 30mm≤R82≤40mm; the curvature radius R91 of the incident surface of the ninth lens G9 satisfies -75mm≤R91≤-65mm, and the curvature radius R92 of the exit surface satisfies 10mm≤R92≤20mm; the curvature radius R91 of the incident surface of the tenth lens G9 satisfies The radius of curvature R101 of the incident surface of lens G10 satisfies 10mm≤R101≤20mm, and the radius of curvature R102 of the exit surface satisfies -20mm≤R102≤-10mm; the radius of curvature R111 of the incident surface of lens 11 satisfies infinity, and the radius of curvature R112 of the exit surface satisfies -25mm≤R112≤-15mm; the radius of curvature R121 of the incident surface of lens 12 satisfies 15mm≤R121≤25mm, and the radius of curvature R122 of the exit surface satisfies 65mm≤R122≤75mm. In conjunction with FIG1 , the incident surface of a lens is the surface of the lens facing the object side; the exit surface of the lens is the surface of the lens facing the image side.

[0107] The curvature radius R51 of the incident surface of the fifth lens G5 and the curvature radius R62 of the exit surface of the sixth lens G6 satisfy 0.5<R51 / R62<5; the curvature radius R91 of the incident surface of the ninth lens G9 and the curvature radius R102 of the exit surface of the tenth lens G10 satisfy 2.5<R91 / R102<7.5.

[0108] The center thickness GT1 of the first lens G1 satisfies 3mm≤GT1≤6mm; the center thickness GT2 of the second lens G2 satisfies 1mm≤GT2≤4mm; the center thickness GT3 of the third lens G3 satisfies 1mm≤GT3≤4mm; the center thickness GT4 of the fourth lens G4 satisfies 2mm≤GT4≤5mm; the center thickness GT5 of the fifth lens G5 satisfies 1mm≤GT5≤4mm; the center thickness GT6 of the sixth lens G6 satisfies 1mm≤GT6≤4mm; the center thickness GT7 of the seventh lens G7 satisfies 1mm≤GT7≤4mm; the center thickness GT8 of the eighth lens G8 satisfies 3mm≤GT≤6mm; the center thickness GT9 of the ninth lens G9 satisfies 1mm≤GT9≤4mm; the center thickness GT10 of the tenth lens G10 satisfies 2mm≤GT10≤5mm; the center thickness GT11 of the eleventh lens G11 satisfies 1mm≤GT1≤4mm; and the center thickness GT12 of the twelfth lens G12 satisfies 2mm≤GT1≤5mm. The center thickness of a lens refers to the thickness of the center of the lens along the optical axis.

[0109] The center thickness GT5 of the fifth lens G5 and the center thickness GT6 of the sixth lens G6 satisfy 0.2<GT5 / GT6<4; the center thickness GT9 of the ninth lens G9 and the center thickness GT10 of the tenth lens G10 satisfy 0.2<GT5 / GT6<2.

[0110] The air distance AT1 between the first lens G1 and the second lens G2 along the optical axis satisfies 0mm≤AT1≤2mm; the air distance AT2 between the second lens G2 and the third lens G3 along the optical axis satisfies 3mm≤AT2≤5mm; the air distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis satisfies 3mm≤AT3≤5mm; the air distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis satisfies 0mm≤AT4≤2mm; the air distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis satisfies 3mm≤AT5≤5mm; the air distance A along the optical axis between the aperture stop 10 and the seventh lens G7 satisfies T6 satisfies 0mm≤AT6≤2mm; an air distance AT7 between the seventh lens G7 and the eighth lens G8 along the optical axis satisfies 0mm≤AT7≤2mm; an air distance AT8 between the eighth lens G8 and the ninth lens G9 along the optical axis satisfies 2mm≤AT8≤4mm; an air distance AT9 between the tenth lens G10 and the eleventh lens G11 along the optical axis satisfies 0mm≤AT9≤2mm; an air distance AT10 between the eleventh lens G11 and the twelfth lens G12 along the optical axis satisfies 0mm≤AT10≤2mm; and an air distance BFL between the twelfth lens G12 and the image plane along the optical axis satisfies 8mm≤BFL≤10mm.

[0111] The air spacing AT6 between the seventh lens element G7 and the aperture stop 10 along the optical axis satisfies 0 mm ≤ AT6 ≤ 2 mm, indicating a relatively small spacing. Furthermore, the surface of the seventh lens element G7 facing the aperture stop 10 is concave, which helps reduce the angle at which light rays are incident on the lens surface and correct systematic aberrations.

[0112] An air distance AT5 between the sixth lens G6 and the aperture stop along the optical axis and an air distance AT6 between the aperture stop and the seventh lens G7 along the optical axis satisfy 3<AT5+AT6<7.

[0113] An air distance BFL between the twelfth lens G12 and the image plane along the optical axis and a total optical length TTL of the optical lens satisfy 0.13<BFL / TTL<0.25.

[0114] The focal length f1 of the first lens G1 satisfies 35mm≤f1≤45mm; the focal length f2 of the second lens G2 satisfies -20mm≤f2≤-10mm; the focal length f3 of the third lens G3 satisfies -20mm≤f3≤-10mm; the focal length f4 of the fourth lens G4 satisfies 10mm≤f4≤20mm; the focal length f5 of the fifth lens G5 satisfies 15mm≤f5≤25mm; the focal length f6 of the sixth lens G6 satisfies -20mm≤f6≤-10mm; the focal length f7 of the seventh lens G7 satisfies The focal length f7 of G7 satisfies 15 mm ≤ f7 ≤ 25 mm; the focal length f8 of the eighth lens element G8 satisfies 25 mm ≤ f8 ≤ 35 mm; the focal length f9 of the ninth lens element G9 satisfies -25 mm ≤ f9 ≤ -15 mm; the focal length f10 of the tenth lens element G10 satisfies 130 mm ≤ f10 ≤ 140 mm; the focal length f11 of the eleventh lens element G11 satisfies 20 mm ≤ f11 ≤ 30 mm; and the focal length f12 of the twelfth lens element G12 satisfies 20 mm ≤ f12 ≤ 30 mm.

[0115] The focal length f1 of the first lens G1 satisfies 5.5<f1 / f<11.5 with the focal length f of the optical lens; the focal length f2 of the second lens G2 satisfies 1.5<|f2 / f|<5 with the focal length f of the optical lens; the focal length f3 of the third lens G3 satisfies 1.5<|f3 / f|<5 with the focal length f of the optical lens; the focal length f4 of the fourth lens G4 satisfies 1.5<f4 / f<5 with the focal length f of the optical lens; the focal length f5 of the fifth lens G5 satisfies 2.5<f5 / f<6.5 with the focal length f6 of the sixth lens G6 satisfies 1.5<|f6 / f|<5 with the focal length f of the optical lens; the focal length f7 of the seventh lens G7 satisfies 1.5<|f7 / f|<5 with the focal length f7 of the optical lens; the focal length f8 of the sixth lens G8 satisfies 1.5<|f8 / f|<5 with the focal length f8 of the optical lens; the focal length f9 of the seventh lens G9 satisfies 1.5<|f9 / f|<5 with the focal length f9 of the optical lens; the focal length f10 of the seventh lens G9 satisfies 1.5<|f10 / f|<5 with the focal length f11 of the optical lens The focal length f7 of the lens G7 satisfies 2.5<f7 / f<6.5 with the focal length f of the optical lens; the focal length f8 of the eighth lens G8 satisfies 4<f8 / f<9 with the focal length f of the optical lens; the focal length f9 of the ninth lens G9 satisfies 2.5<|f9 / f|<6.5 with the focal length f of the optical lens; the focal length f10 of the tenth lens G10 satisfies 21.5<f10 / f<35 with the focal length f of the optical lens; the focal length f11 of the eleventh lens G11 satisfies 3<f11 / f<7.5 with the focal length f12 of the twelfth lens G12 satisfies 3<f12 / f<7.5 with the focal length f of the optical lens.

[0116] The refractive index N1 of the first lens element G1 satisfies 1.9≤N1≤2.0, and the Abbe number V1 satisfies 15≤V1≤20; the refractive index N2 of the second lens element G2 satisfies 1.9≤N2≤2.0, and the Abbe number V2 satisfies 30≤V2≤35; the refractive index N3 of the third lens element G3 satisfies 1.8≤N3≤1.9, and the Abbe number V3 satisfies 35≤V3≤40; the refractive index N4 of the fourth lens element G4 satisfies 1.6≤N4≤1.7, and the Abbe number V4 satisfies 55≤V4≤60; the refractive index N5 of the fifth lens element G5 satisfies 1.6≤N5≤1.7, and the Abbe number V5 satisfies 55≤V5≤60; the refractive index N6 of the sixth lens element G6 satisfies 1.5≤N6≤1.6, and the Abbe number V6 satisfies 40≤V6≤45; the refractive index N8 of the seventh lens element G7 satisfies The refractive index N7 satisfies 1.6≤N7≤1.7, and the Abbe number V7 satisfies 55≤V7≤60; the refractive index N8 of the eighth lens element G8 satisfies 1.7≤N8≤1.8, and the Abbe number V8 satisfies 25≤V8≤30; the refractive index N9 of the ninth lens element G9 satisfies 1.9≤N9≤2.0, and the Abbe number V9 satisfies 25≤V9≤30; the refractive index N10 of the tenth lens element G10 satisfies 1.4≤N10≤1.5, and the Abbe number V10 satisfies 70≤V10≤75; the refractive index N11 of the eleventh lens element G11 satisfies 1.8≤N11≤1.9, and the Abbe number V11 satisfies 35≤V11≤40; the refractive index N12 of the twelfth lens element G12 satisfies 1.8≤N12≤1.9, and the Abbe number V12 satisfies 40≤V12≤45. The embodiments of the present disclosure define the material properties of each lens by defining the refractive index and Abbe number of each lens.

[0117] The fourth lens element G4 has a relatively high Abbe number (V4) of 55≤V4≤60, enabling direct chromatic aberration correction of the imaging beam from the first lens group 1. The eighth lens element G8 has a relatively low Abbe number (V8) of 25≤V8≤30, minimizing differences in convergence points between different wavelengths and reducing axial chromatic aberration.

[0118] The parameters of each lens in this embodiment can be calculated using optical design software or through a ray tracing algorithm, but the present disclosure does not limit the design tools and design process.

[0119] The performance of the optical lens according to the embodiment of the present disclosure is described below with reference to Figures 2 to 7. Figure 2 is a field curvature diagram of the optical lens according to the embodiment of the present disclosure; Figure 3 is a distortion diagram of the optical lens according to the embodiment of the present disclosure; Figure 4 is an MTF curve diagram of the optical lens according to the embodiment of the present disclosure; Figure 5 is a relative illumination curve diagram of the optical lens according to the embodiment of the present disclosure; Figure 6 is an actual image of the lens at a relative illumination of 30%; and Figure 7 is an actual image of the optical lens according to the embodiment of the present disclosure at a relative illumination of 78%.

[0120] Referring to the field curvature diagram in Figure 2, the ordinate represents the field of view, and the abscissa is in millimeters. The solid and dashed lines represent the meridional and sagittal components of field curvature at different wavelengths within the operating band. The solid line represents the field curvature component in the meridional direction, which is perpendicular to the optical axis; the dashed line represents the field curvature component in the sagittal direction, which is along the optical axis. The field curvature of the optical lens disclosed herein is greater than -0.05 mm and less than 0.05 mm across the entire field of view.

[0121] Referring to the distortion diagram in Figure 3, the ordinate represents the field of view, and the abscissa represents the distortion value. Each curve represents the distortion value at different wavelengths within the operating band. The optical lens disclosed herein has a distortion of less than 0.5%, resulting in minimal distortion in the full-frame image, ensuring image authenticity.

[0122] Figure 4 shows an MTF (Modulation Transfer Function) curve. The horizontal axis represents spatial frequency in line pairs per millimeter (lp / mm), and the vertical axis represents contrast, ranging from 0 to 1. The solid and dashed lines represent the meridional and sagittal components of the MTF at different fields of view. The solid line represents the contrast component in the meridional direction, which is perpendicular to the optical axis; the dashed line represents the contrast component in the sagittal direction, which is along the optical axis. The higher the two curves, and the closer they are, the better the image quality. Across the entire field of view, the optical lens's MTF value at a contrast ratio of 200 lp / mm is greater than 0.3, demonstrating extremely high resolution and enabling application in ultra-high-pixel sensors, enabling precision inspection.

[0123] As shown in the relative illumination curve in Figure 5, the horizontal axis is the field of view, and the unit is mm. Among them, 0mm is the center field of view, 4.65mm is half the diagonal length of the imaging image sensor, and 4.65mm represents the edge field of view. The vertical axis is the relative illumination, and the value range is 0 to 1. The optical lens of the embodiment of the present disclosure has a relative illumination of 100% in the center field of view, and a relative illumination of greater than 78% in the edge field of view. In this way, the relative illumination of the full field of view of the optical lens of the present disclosure is greater than 78%, which can ensure the uniformity of the entire picture. There will be no dark corners even at the edge of the picture, and the difference between the edge brightness and the center brightness is small.

[0124] Combined with Figures 6 and 7, the actual images taken with a lens at a relative illumination of 30% show dark corners at the edges and poor brightness uniformity across the frame. The actual images taken with the optical lens of the present disclosure at a relative illumination of 78% show high brightness uniformity across the frame. Furthermore, combined with Figures 6 and 7, the relative illumination of the lens significantly affects the uniformity of the overall image. The optical lens of the present disclosure embodiment has a relative illumination of greater than 78% across the entire field of view, resulting in high illumination uniformity in the image.

[0125] Therefore, the optical lens designed in the present disclosure is a wide-angle lens with low distortion and high-resolution imaging performance, high mass producibility and low cost; at the same time, compared with the current industrial lenses of the same focal length, the relative illumination is further improved.

[0126] The optical lens provided by the embodiment of the present disclosure can be applied to detection and identification application fields, and has a large field of view and high resolution; it has low distortion performance, which makes the image distortion less, and has a high relative illumination, which makes the image surface illumination more uniform.

[0127] Example 2

[0128] In some embodiments, the focal length f of the optical lens satisfies 4.7mm≤f≤5.5mm; the aperture number Fno of the optical lens satisfies F1.9≤Fno≤F2.0; the field of view angle FOV of the optical lens satisfies 82°≤FOV≤83°; the image side target surface size IMG of the optical lens satisfies 8.3mm≤IMG≤9.8mm; the working band WL of the optical lens satisfies 630nm≤WL≤650nm; and the total optical length TTL of the optical lens satisfies 46mm≤TTL≤55mm.

[0129] The focal length f of the optical lens in the embodiment of the present disclosure and the image-side target surface size IMG of the optical lens satisfy 0.45<f / IMG<0.67.

[0130] In the embodiment of the present disclosure, the focal length fa of the first lens group 1 satisfies -9.2 mm ≤ fa ≤ -7.8 mm; the focal length fb of the second lens group 2 satisfies 11.9 mm ≤ fb ≤ 14.0 mm; and the focal length fc of the third lens group 3 satisfies 10.3 mm ≤ fc ≤ 12.2 mm.

[0131] The focal length fa of the first lens group 1 and the focal length f of the optical lens satisfy 1.4<|fa / f|<2.0; the focal length fb of the second lens group 2 and the focal length f of the optical lens satisfy 2.1<fb / f<3.0; the focal length fc of the third lens group 3 and the focal length f of the optical lens satisfy 1.8<fc / f<2.6.

[0132] An axial distance d12 between the first lens group 1 and the second lens group 2 satisfies 3.1 mm ≤ d12 ≤ 3.7 mm; an axial distance d23 between the second lens group 2 and the third lens group 3 satisfies 2.3 mm ≤ d23 ≤ 2.8 mm.

[0133] An axial distance d12 between the first lens group 1 and the second lens group 2 and an axial distance d23 between the second lens group 2 and the third lens group 3 satisfy 1.1<d12 / d23<1.7.

[0134] The radius of curvature R11 of the incident surface of the first lens G1 satisfies 17.4 mm ≤ R11 ≤ 20.5 mm, and the radius of curvature R12 of the exit surface satisfies 32.7 mm ≤ R12 ≤ 38.3 mm. The radius of curvature R21 of the incident surface of the second lens G2 satisfies 14.1 mm ≤ R21 ≤ 16.7 mm, and the radius of curvature R22 of the exit surface satisfies 6.2 mm ≤ R22 ≤ 7.4 mm. The radius of curvature R31 of the incident surface of the third lens G3 satisfies 16.2 mm ≤ R31 ≤ 19.1 mm, and the radius of curvature R32 of the exit surface satisfies 5.7 mm ≤ R32 ≤ 6.8 mm. The fourth lens G4 The curvature radius R41 of the incident surface satisfies -106.5mm≤R41≤-90.9mm, and the curvature radius R42 of the exit surface satisfies -27.6mm≤R42≤-23.5mm; the curvature radius R51 of the incident surface of the fifth lens element G5 satisfies 12.1mm≤R51≤14.2mm, and the curvature radius R52 of the exit surface satisfies 156.0mm≤R52≤182.7mm; the curvature radius R61 of the incident surface of the sixth lens element G6 satisfies 156.0mm≤R61≤182.7mm, and the curvature radius R62 of the exit surface satisfies 6.8mm≤R62≤8.0mm; The radius of curvature R71 of the incident surface of lens G7 satisfies -18.0 mm ≤ R71 ≤ -15.3 mm, and the radius of curvature R72 of the exit surface satisfies -7.7 mm ≤ R72 ≤ -6.5 mm; the radius of curvature R81 of the incident surface of the eighth lens G8 satisfies 12.4 mm ≤ R81 ≤ 14.6 mm, and the radius of curvature R82 of the exit surface satisfies 28.1 mm ≤ R82 ≤ 33.0 mm; the radius of curvature R91 of the incident surface of the ninth lens satisfies -73.5 mm ≤ R91 ≤ -62.7 mm, and the radius of curvature R92 of the exit surface satisfies 12.4 mm ≤ R92 ≤ 14.6 mm; The radius of curvature R101 of the incident surface of lens G10 satisfies 12.4 mm ≤ R101 ≤ 14.6 mm, and the radius of curvature R102 of the exit surface satisfies -12.7 mm ≤ R102 ≤ -10.7 mm; the radius of curvature R111 of the incident surface of the eleventh lens G11 is infinite, and the radius of curvature R112 of the exit surface satisfies -22.4 mm ≤ R112 ≤ -19.0 mm; the radius of curvature R121 of the incident surface of the twelfth lens G12 satisfies 15.7 mm ≤ R121 ≤ 18.5 mm, and the radius of curvature R122 of the exit surface satisfies 78.5 mm ≤ R122 ≤ 92.0 mm.

[0135] In the first cemented lens group, the curvature radius R51 of the incident surface of the fifth lens element G5 and the curvature radius R62 of the exit surface of the sixth lens element G6 satisfy 1.5<R51 / R62<2.1; in the second cemented lens group, the curvature radius R91 of the incident surface of the ninth lens element and the curvature radius R102 of the exit surface of the tenth lens element G10 satisfy 4.9<R91 / R102<6.9.

[0136] The center thickness GT1 of the first lens G1 satisfies 3.8mm≤GT1≤4.6mm; the center thickness GT2 of the second lens G2 satisfies 1.2mm≤GT2≤1.5mm; the center thickness GT3 of the third lens G3 satisfies 1.1mm≤GT3≤1.3mm; the center thickness GT4 of the fourth lens G4 satisfies 2.0mm≤GT4≤2.4mm; the center thickness GT5 of the fifth lens G5 satisfies 1.0mm≤GT5≤1.3mm; the center thickness GT6 of the sixth lens G6 satisfies 1.3mm≤GT6≤1.6mm; the center thickness GT7 of the seventh lens G7 satisfies 1.1mm≤GT7≤1.3mm; the center thickness GT8 of the sixth lens G8 satisfies 1.1mm≤GT8≤1.6mm; the center thickness GT9 of the seventh lens G9 satisfies 1.1mm≤GT9≤1.3mm; the center thickness GT1 of the first lens G1 satisfies 3.8mm≤GT1≤4.6mm; the center thickness GT1 of the second lens G2 satisfies 1.2mm≤GT2≤1.5mm; the center thickness GT3 of the third lens G3 satisfies 1.1mm≤GT3≤1.3mm; the center thickness GT4 of the fourth lens G4 satisfies 2.0mm≤GT4≤2.4mm; the center thickness GT5 of the fifth lens G5 satisfies 1.0mm≤GT5≤1.3mm; the center thickness GT6 of the sixth lens G6 satisfies 1.3mm≤GT6≤1.6mm; the center thickness GT1 of the sixth lens G6 satisfies 1.1mm≤GT1≤1.6mm; the center thickness GT1 of the sixth lens G6 satisfies 1.1mm≤GT1≤1.6mm; the The center thickness GT7 of G7 satisfies 1.2 mm ≤ GT7 ≤ 1.5 mm; the center thickness GT8 of the eighth lens G8 satisfies 3.6 mm ≤ GT8 ≤ 4.3 mm; the center thickness GT9 of the ninth lens satisfies 1.2 mm ≤ GT9 ≤ 1.5 mm; the center thickness GT10 of the tenth lens G10 satisfies 3.3 mm ≤ GT10 ≤ 3.9 mm; the center thickness GT11 of the eleventh lens G11 satisfies 2.0 mm ≤ GT11 ≤ 2.4 mm; and the center thickness GT12 of the twelfth lens G12 satisfies 2.3 mm ≤ GT12 ≤ 2.8 mm.

[0137] In the first cemented lens group, the center thickness GT5 of the fifth lens G5 and the center thickness GT6 of the sixth lens G6 satisfy 0.6<GT5 / GT6<14; in the second cemented lens group, the center thickness GT9 of the ninth lens and the center thickness GT10 of the tenth lens G10 satisfy 0.3<GT5 / GT6<0.5.

[0138] The air distance AT1 between the first lens G1 and the second lens G2 along the optical axis satisfies 0.08mm≤AT1≤0.11mm; the air distance AT2 between the second lens G2 and the third lens G3 along the optical axis satisfies 3.49mm≤AT2≤4.10mm; the air distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis satisfies 3.10mm≤AT3≤3.64mm; the air distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis satisfies 0.08mm≤AT4≤0.11mm; the fifth lens G5 and the sixth lens G6 are cemented lenses; the air distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis satisfies 2.99mm≤AT5≤3.51mm; the air distance AT6 between the aperture stop 10 and the seventh lens G7 along the optical axis satisfies The optical axis of the optical lens element is 0.26 mm ≤ AT6 ≤ 0.31 mm; the air distance AT7 between the seventh lens element G7 and the eighth lens element G8 along the optical axis satisfies 1.45 mm ≤ AT7 ≤ 1.71 mm; the air distance AT8 between the eighth lens element G8 and the ninth lens element G9 along the optical axis satisfies 2.37 mm ≤ AT8 ≤ 2.78 mm; the ninth lens element G9 and the tenth lens element G10 are a cemented lens; the air distance AT9 between the tenth lens G10 and the eleventh lens G11 along the optical axis satisfies 0.08 mm ≤ AT9 ≤ 0.11 mm; the air distance AT10 between the eleventh lens G11 and the twelfth lens G12 along the optical axis satisfies 0.08 mm ≤ AT10 ≤ 0.11 mm; and the air distance BFL between the twelfth lens G12 and the image plane along the optical axis satisfies 7.72 mm ≤ BFL ≤ 9.05 mm.

[0139] An air distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis and an air distance AT6 between the aperture stop 10 and the seventh lens G7 along the optical axis satisfy 3.25<AT5+AT6<3.82.

[0140] An air distance BFL between the twelfth lens G12 and the image plane along the optical axis and a total optical length TTL of the system satisfy 0.14<BFL / TTL<0.2.

[0141] The focal length f1 of the first lens element G1 satisfies 35.7 mm ≤ f1 ≤ 41.9 mm; the focal length f2 of the second lens element G2 satisfies -16.0 mm ≤ f2 ≤ -13.5 mm; the focal length f3 of the third lens element G3 satisfies -12.5 mm ≤ f3 ≤ -10.6 mm; the focal length f4 of the fourth lens element G4 satisfies 47.7 mm ≤ f4 ≤ 55.9 mm; the focal length f5 of the fifth lens element G5 satisfies 20.1 mm ≤ f5 ≤ 23.6 mm; the focal length f6 of the sixth lens element G6 satisfies -14.1 mm ≤ f6 ≤ -12.0 mm; the focal length f7 of the seventh lens element G7 satisfies The focal length f7 of G7 satisfies 17.2 mm ≤ f7 ≤ 20.3 mm; the focal length f8 of the eighth lens element G8 satisfies 27.6 mm ≤ f8 ≤ 32.4 mm; the focal length f9 of the ninth lens element G9 satisfies -20.6 mm ≤ f9 ≤ -17.5 mm; the focal length f10 of the tenth lens element G10 satisfies 117.6 mm ≤ f10 ≤ 137.7 mm; the focal length f11 of the eleventh lens element G11 satisfies 21.7 mm ≤ f12 ≤ 25.5 mm; and the focal length f12 of the twelfth lens element G12 satisfies 23.4 mm ≤ f13 ≤ 27.4 mm.

[0142] The focal length f1 of the first lens G1 satisfies 6.4<f1 / f<9.0 with the focal length f of the lens; the focal length f2 of the second lens G2 satisfies 2.4<|f2 / f|<3.0 with the focal length f of the lens; the focal length f3 of the third lens G3 satisfies 1.9<|f3 / f|<2.7 with the focal length f of the lens; the focal length f4 of the fourth lens G4 satisfies 8.6<f4 / f<11.9 with the focal length f of the lens; the focal length f5 of the fifth lens G5 satisfies 3.6<f5 / f<5.1 with the focal length f6 of the sixth lens G6 satisfies 2.1<|f6 / f|<3 with the focal length f of the lens; the focal length f6 of the seventh lens G7 satisfies 1.9<|f3 / f|<2.7 with the focal length f3 of the third lens G7; the focal length f7 of the fourth lens G7 satisfies 8.6<f4 / f<11.9 with the focal length f3 of the fourth lens G7; the focal length f7 of the fifth lens G7 satisfies 3.6<f7 / f<5.1 with the focal length f3 of the fifth lens G7; the focal length f7 of the sixth lens G7 satisfies 2.1<|f7 / f|<3 with the focal length f3 of the sixth lens G7; the focal length f7 of the seventh lens G7 satisfies 1.9<|f7 / f|<2.7 with the focal length f3 of the third lens G7; the focal length f7 of the fourth lens G7 satisfies 1.9<|f7 / f|<2.7 with the focal length f3 of the third lens G7 The focal length f7 of the eighth lens element G7 satisfies 3.1<f7 / f<4.4 with the focal length f of the lens; the focal length f8 of the eighth lens element G8 satisfies 5.0<f8 / f<6.9 with the focal length f of the lens; the focal length f9 of the ninth lens element G9 satisfies 3.1<|f9 / f|<4.4 with the focal length f of the lens; the focal length f10 of the tenth lens G10 satisfies 21.4<f10 / f<29.3 with the focal length f11 of the eleventh lens G11 satisfies 3.9<f11 / f<5.5 with the focal length f of the lens; and the focal length f12 of the twelfth lens G12 satisfies 4.2<f12 / f<5.9 with the focal length f of the lens.

[0143] The refractive index N1 of the first lens G1 satisfies 1.93≤N1≤1.98, and the Abbe number V1 satisfies 17.7≤V1≤18.2; the refractive index N2 of the second lens G2 satisfies 1.88≤N2≤1.93, and the Abbe number V2 satisfies 31.1≤V2≤31.6; the refractive index N3 of the third lens G3 satisfies 1.86≤N3≤1.91, and the Abbe number V3 satisfies 38.9≤V3≤39.4; the fourth lens The refractive index N4 of G4 satisfies 1.63≤N4≤1.68, and the Abbe number V4 satisfies 57.1≤V4≤57.6; the refractive index N5 of the fifth lens element G5 satisfies 1.59≤N5≤1.64, and the Abbe number V5 satisfies 56.5≤V5≤57.0; the refractive index N6 of the sixth lens element G6 satisfies 1.55≤N6≤1.60, and the Abbe number V6 satisfies 42.5≤V6≤43.0; the refractive index N6 of the seventh lens element G7 satisfies 1.55≤N6≤1.60, and the Abbe number V6 satisfies 42.5≤V6≤43.0; The refractive index N7 satisfies 1.60≤N7≤1.65, and the Abbe number V7 satisfies 56.5≤V7≤57.0; the refractive index N8 of the eighth lens element G8 satisfies 1.72≤N8≤1.77, and the Abbe number V8 satisfies 28.0≤V8≤28.5; the refractive index N9 of the ninth lens element G9 satisfies 1.95≤N9≤2.0, and the Abbe number V9 satisfies 25.2≤V9≤25.7; the refractive index N1 of the tenth lens element G10 satisfies 0 satisfies 1.47≤N10≤1.52, and the Abbe number V10 satisfies 70.1≤V10≤70.6; the refractive index N11 of the eleventh lens G11 satisfies 1.85≤N11≤1.90, and the Abbe number V11 satisfies 39.0≤V11≤39.5; the refractive index N12 of the twelfth lens G12 satisfies 1.80≤N12≤1.85, and the Abbe number V12 satisfies 42.5≤V12≤43.0.

[0144] Example 1

[0145] In some embodiments, the focal length f of the optical lens is 4.8 mm; the aperture number Fno of the optical lens is F2.0; the field of view angle FOV of the optical lens satisfies 82.7°; the image side target surface size IMG satisfies 8.5 mm; the working band WL of the optical lens satisfies 630 nm ≤ WL ≤ 650 nm; and the total optical length TTL of the optical lens satisfies 47.5 mm.

[0146] The focal length fa of the first lens group 1 is -7.97 mm; the focal length fb of the second lens group 2 is 12.2 mm; and the focal length fc of the third lens group 3 is 10.6 mm.

[0147] The axial distance d12 between the first lens group 1 and the second lens group 2 meets 3.17 mm; the axial distance d23 between the second lens group 2 and the third lens group 3 meets 2.43 mm.

[0148] The curvature radii of each lens are as follows: the curvature radius R11 of the incident surface of the first lens G1 is 17.86mm, and the curvature radius R12 of the exit surface is 33.42mm; the curvature radius R21 of the incident surface of the second lens G2 is 14.50mm, and the curvature radius R22 of the exit surface is 6.42mm; the curvature radius R31 of the incident surface of the third lens G3 is 16.58mm, and the curvature radius R32 of the exit surface is 5. 85mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -92.90mm, and the curvature radius R42 of the exit surface is -24.03mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 12.36mm, and the curvature radius R52 of the exit surface is 159.41mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 159.41mm, and the curvature radius R62 of the exit surface is 6.96m m; the curvature radius R71 of the incident surface of the seventh lens G7 is -15.65mm, and the curvature radius R72 of the exit surface is -6.64mm; the curvature radius R81 of the incident surface of the eighth lens G8 is 12.70mm, and the curvature radius R82 of the exit surface is 28.77mm; the curvature radius R91 of the incident surface of the ninth lens G9 is -64.13mm, and the curvature radius R92 of the exit surface is 12.70mm; the curvature radius R91 of the incident surface of the tenth lens G9 is -64.13mm, and the curvature radius R92 of the exit surface is 12.70mm; The curvature radius R101 of the incident surface of lens G10 is 12.70 mm, and the curvature radius R102 of the exit surface is -11.00 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is infinite, and the curvature radius R112 of the exit surface is -19.48 mm; the curvature radius R121 of the incident surface of the twelfth lens G12 is 16.13 mm, and the curvature radius R122 of the exit surface is 80.21 mm.

[0149] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 3.96 mm; the center thickness GT2 of the second lens G2 is 1.29 mm; the center thickness GT3 of the third lens G3 is 1.13 mm; the center thickness GT4 of the fourth lens G4 is 2.05 mm; the center thickness GT5 of the fifth lens G5 is 1.12 mm; the center thickness GT6 of the sixth lens G6 is 1.35 mm; the center thickness GT7 of the seventh lens G7 is 1.30 mm; the center thickness GT8 of the eighth lens G8 is 3.70 mm; the center thickness GT9 of the ninth lens G9 is 1.30 mm; the center thickness GT10 of the tenth lens G10 is 3.39 mm; the center thickness GT11 of the eleventh lens G11 is 2.08 mm; and the center thickness GT12 of the twelfth lens G12 is 2.43 mm.

[0150] The air spacing between the lenses is as follows: the air spacing distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.09 mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 3.57 mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 3.17 mm; the air spacing distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.09 mm; the fifth lens G5 and the sixth lens G6 are cemented lenses; the air spacing distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis is 3.06 mm; the air spacing distance AT5 between the aperture stop 10 and the seventh lens G7 .... The air distance AT6 along the optical axis is 0.27 mm; the air distance AT7 along the optical axis between the seventh lens element G7 and the eighth lens element G8 is 1.49 mm; the air distance AT8 along the optical axis between the eighth lens element G8 and the ninth lens element G9 is 2.43 mm; the ninth lens element G9 and the tenth lens element G10 are a cemented lens; the air distance AT9 along the optical axis between the tenth lens element G10 and the eleventh lens element G11 is 0.09 mm; the air distance AT10 along the optical axis between the eleventh lens element G11 and the twelfth lens element G12 is 0.09 mm; and the air distance BFL along the optical axis between the twelfth lens G12 and the image plane is 7.89 mm.

[0151] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 36.55 mm; the focal length f2 of the second lens G2 is -13.89 mm; the focal length f3 of the third lens G3 is -10.84 mm; the focal length f4 of the fourth lens G4 is 48.77 mm; the focal length f5 of the fifth lens G5 is 20.54 mm; the focal length f6 of the sixth lens G6 is -12.30 mm; the focal length f7 of the seventh lens G7 is 17.64 mm; the focal length f8 of the eighth lens G8 is 28.21 mm; the focal length f9 of the ninth lens G9 is -17.95 mm; the focal length f10 of the tenth lens G10 is 120.17 mm; the focal length f11 of the eleventh lens G11 is 22.19 mm; and the focal length f12 of the twelfth lens G12 is 23.91 mm.

[0152] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.95, and the Abbe number V1 is 17.9; the refractive index N2 of the second lens G2 is 1.90, and the Abbe number V2 is 31.3; the refractive index N3 of the third lens G3 is 1.88, and the Abbe number V3 is 39.2; the refractive index N4 of the fourth lens G4 is 1.66, and the Abbe number V4 is 57.3; the refractive index N5 of the fifth lens G5 is 1.61, and the Abbe number V5 is 56.7; and the refractive index N6 of the sixth lens G6 is 1.57, and the Abbe number V6 is 42. 8; the refractive index N7 of the seventh lens element G7 is 1.62, and the Abbe number V7 is 56.7; the refractive index N8 of the eighth lens element G8 is 1.74, and the Abbe number V8 is 28.3; the refractive index N9 of the ninth lens element G9 is 2.00, and the Abbe number V9 is 25.4; the refractive index N10 of the tenth lens element G10 is 1.49, and the Abbe number V10 is 70.4; the refractive index N11 of the eleventh lens element G11 is 1.88, and the Abbe number V11 is 39.2; the refractive index N12 of the twelfth lens G12 is 1.83, and the Abbe number V12 is 42.7.

[0153] With reference to the field curvature diagram shown in FIG8 , the field curvature value of the optical lens in this example is greater than −0.05 mm and less than 0.05 mm within the full field of view.

[0154] Combined with the distortion diagram shown in FIG9 , the distortion of the optical lens of this example is less than 0.5%, and the full-frame distortion of the imaging is small, which helps to ensure the authenticity of the imaging.

[0155] Combined with the MTF curve shown in FIG10 , the optical lens of this example has a contrast ratio greater than or equal to 0.3 at a spatial frequency of 200 cycles / mm over the entire field of view, indicating extremely high resolution.

[0156] In conjunction with the relative illumination curve shown in Figure 11, the horizontal axis at 0mm represents the center field of view, and 4.26mm represents the edge field of view. The optical lens in this example has a relative illumination of 100% at the center field of view, and a relative illumination of greater than 76% at the edge field of view. Thus, the relative illumination of the entire field of view of this example optical lens exceeds 76%, ensuring uniformity across the entire image. Even at the edges of the image, there is no vignetting, and the difference in brightness between the edges and the center is minimal.

[0157] Example 2

[0158] In some embodiments, the focal length f of the optical lens is 5.4 mm; the aperture number Fno of the optical lens is F2.0; the field of view angle FOV of the optical lens satisfies 82.7°; the image side target surface size IMG satisfies 9.6 mm; the working band WL of the optical lens satisfies 630 nm ≤ WL ≤ 650 nm; and the total optical length TTL of the optical lens satisfies 53.3 mm.

[0159] The focal length fa of the first lens group 1 is -8.97 mm; the focal length fb of the second lens group 2 is 13.73 mm; and the focal length fc of the third lens group 3 is 11.92 mm.

[0160] The axial distance d12 between the first lens group 1 and the second lens group 2 meets 3.57 mm; the axial distance d23 between the second lens group 2 and the third lens group 3 meets 2.73 mm.

[0161] The curvature radii of each lens are as follows: the curvature radius R11 of the incident surface of the first lens G1 is 20.09mm, and the curvature radius R12 of the exit surface is 37.59mm; the curvature radius R21 of the incident surface of the second lens G2 is 16.31mm, and the curvature radius R22 of the exit surface is 7.22mm; the curvature radius R31 of the incident surface of the third lens G3 is 18.66mm, and the curvature radius R32 of the exit surface is 6. 58mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -104.50mm, and the curvature radius R42 of the exit surface is -27.03mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 13.90mm, and the curvature radius R52 of the exit surface is 179.32mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 179.32mm, and the curvature radius R62 of the exit surface is 7.83m m; the curvature radius R71 of the incident surface of the seventh lens G7 is -17.61mm, and the curvature radius R72 of the exit surface is -7.47mm; the curvature radius R81 of the incident surface of the eighth lens G8 is 14.28mm, and the curvature radius R82 of the exit surface is 32.37mm; the curvature radius R91 of the incident surface of the ninth lens G9 is -72.13mm, and the curvature radius R92 of the exit surface is 14.29mm; the curvature radius R91 of the incident surface of the tenth lens G9 is -72.13mm, and the curvature radius R92 of the exit surface is 14.29mm; The curvature radius R101 of the incident surface of lens G10 is 14.29 mm, and the curvature radius R102 of the exit surface is -12.38 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is infinite, and the curvature radius R112 of the exit surface is -21.91 mm; the curvature radius R121 of the incident surface of the twelfth lens G12 is 18.14 mm, and the curvature radius R122 of the exit surface is 90.22 mm.

[0162] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 4.45 mm; the center thickness GT2 of the second lens G2 is 1.45 mm; the center thickness GT3 of the third lens G3 is 1.27 mm; the center thickness GT4 of the fourth lens G4 is 2.31 mm; the center thickness GT5 of the fifth lens G5 is 1.26 mm; the center thickness GT6 of the sixth lens G6 is 1.51 mm; the center thickness GT7 of the seventh lens G7 is 1.46 mm; the center thickness GT8 of the eighth lens G8 is 4.17 mm; the center thickness GT9 of the ninth lens G9 is 1.46 mm; the center thickness GT10 of the tenth lens G10 is 3.81 mm; the center thickness GT11 of the eleventh lens G11 is 2.34 mm; and the center thickness GT12 of the twelfth lens G12 is 2.73 mm.

[0163] The air spacing between the lenses is as follows: the air spacing distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.10 mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 4.02 mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 3.57 mm; the air spacing distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.10 mm; the fifth lens G5 and the sixth lens G6 are cemented lenses; the air spacing distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis is 3.44 mm; the air spacing distance AT5 between the aperture stop 10 and the seventh lens G7 along the optical axis is 3.57 mm. The air distance AT6 along the optical axis is 0.30 mm; the air distance AT7 along the optical axis between the seventh lens G7 and the eighth lens G8 is 1.67 mm; the air distance AT8 along the optical axis between the eighth lens G8 and the ninth lens G9 is 2.73 mm; the ninth lens G9 and the tenth lens G10 are a cemented lens; the air distance AT9 along the optical axis between the tenth lens G10 and the eleventh lens G11 is 0.10 mm; the air distance AT10 along the optical axis between the eleventh lens G11 and the twelfth lens G12 is 0.10 mm; and the air distance BFL along the optical axis between the twelfth lens G12 and the image plane is 8.88 mm.

[0164] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 41.11 mm; the focal length f2 of the second lens G2 is -15.62 mm; the focal length f3 of the third lens G3 is -12.19 mm; the focal length f4 of the fourth lens G4 is 54.86 mm; the focal length f5 of the fifth lens G5 is 23.10 mm; the focal length f6 of the sixth lens G6 is -13.83 mm; the focal length f7 of the seventh lens G7 is 19.84 mm; the focal length f8 of the eighth lens G8 is 31.74 mm; the focal length f9 of the ninth lens G9 is -20.19 mm; the focal length f10 of the tenth lens G10 is 135.24 mm; the focal length f11 of the eleventh lens G11 is 24.96 mm; and the focal length f12 of the twelfth lens G12 is 26.89 mm.

[0165] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.95, and the Abbe number V1 is 17.9; the refractive index N2 of the second lens G2 is 1.90, and the Abbe number V2 is 31.3; the refractive index N3 of the third lens G3 is 1.88, and the Abbe number V3 is 39.2; the refractive index N4 of the fourth lens G4 is 1.66, and the Abbe number V4 is 57.3; the refractive index N5 of the fifth lens G5 is 1.61, and the Abbe number V5 is 56.7; the refractive index N6 of the sixth lens G6 is 1.57, and the Abbe number V6 is 4 The seventh lens G7 has a refractive index N7 of 1.62 and an Abbe number V7 of 56.7. The eighth lens G8 has a refractive index N8 of 1.74 and an Abbe number V8 of 28.3. The ninth lens G9 has a refractive index N9 of 2.00 and an Abbe number of 25.4. The tenth lens G10 has a refractive index N10 of 1.49 and an Abbe number V10 of 70.4. The eleventh lens G11 has a refractive index N11 of 1.88 and an Abbe number V11 of 39.2. The twelfth lens G12 has a refractive index N12 of 1.83 and an Abbe number of 42.7.

[0166] With reference to the field curvature diagram shown in FIG12 , the field curvature value of the optical lens in this example is greater than −0.05 mm and less than 0.05 mm within the full field of view.

[0167] Combined with the distortion diagram shown in FIG13 , the distortion of the optical lens of this example is less than 0.5%, and the full-frame distortion of the imaging is small, which helps to ensure the authenticity of the imaging.

[0168] Combined with the MTF curve shown in FIG14 , the optical lens of this example has a contrast ratio greater than 0.29 at a spatial frequency of 200 cycles / mm over the entire field of view, indicating extremely high resolution.

[0169] In conjunction with the relative illumination curve shown in Figure 15, the horizontal axis at 0mm represents the center field of view, and 4.79mm represents the edge field of view. The optical lens in this example has a relative illumination of 100% at the center field of view, and a relative illumination of greater than 76% at the edge field of view. Thus, the relative illumination of the entire field of view of this example optical lens exceeds 76%, ensuring uniformity across the entire image. Even at the edges of the image, there is no vignetting, and the difference in brightness between the edges and the center is minimal.

[0170] Example 3

[0171] In some embodiments, the focal length of the optical lens satisfies 5.25mm≤f≤5.35mm; the aperture number Fno of the optical lens satisfies F1.9≤Fno≤F2.0; the field of view angle FOV of the optical lens satisfies 82.5°≤FOV≤83°; the image side target surface size IMG of the optical lens satisfies 9.3mm≤IMG≤9.5mm; the working band WL of the optical lens satisfies 630nm≤WL≤650nm; and the total optical length TTL of the optical lens satisfies 51mm≤TTL≤53mm.

[0172] In the embodiment of the present disclosure, the focal length f of the optical lens and the image-side target surface size IMG of the optical lens satisfy 0.55<f / IMG<0.58.

[0173] In the embodiment of the present disclosure, the focal length fa of the first lens group 1 satisfies -8.9 mm ≤ fa ≤ -8.7 mm; the focal length fb of the second lens group 2 satisfies 13.3 mm ≤ fb ≤ 13.6 mm; and the focal length fc of the third lens group 3 satisfies 11.5 mm ≤ fc ≤ 11.9 mm.

[0174] The focal length fa of the first lens group 1 and the focal length f of the optical lens satisfy 1.6<|fa / f|<1.7; the focal length fb of the second lens group 2 and the focal length f of the optical lens satisfy 2.4<fb / f<2.6; the focal length fc of the third lens group 3 and the focal length f of the optical lens satisfy 2.1<fc / f<2.3.

[0175] An axial distance d12 between the first lens group 1 and the second lens group 2 satisfies 3.4 mm ≤ d12 ≤ 3.6 mm; an axial distance d23 between the second lens group 2 and the third lens group 3 satisfies 2.6 mm ≤ d23 ≤ 2.8 mm.

[0176] An axial distance d12 between the first lens group 1 and the second lens group 2 and an axial distance d23 between the second lens group 2 and the third lens group 3 satisfy 1.2<d12 / d23<1.4.

[0177] The curvature radius of each lens is as follows: the curvature radius R11 of the incident surface of the first lens G1 satisfies 19.5mm≤R11≤20.0mm, and the curvature radius R12 of the exit surface satisfies 30.6mm≤R12≤37.3mm; the curvature radius R21 of the incident surface of the second lens G2 satisfies 15.9mm≤R21≤16.2mm, and the curvature radius R22 of the exit surface satisfies 7.0mm≤R22≤7.2mm; the curvature radius R31 of the incident surface of the third lens G3 satisfies 18.1mm≤R31≤18.5mm, and the curvature radius R32 of the exit surface satisfies 6.4mm≤R32≤6.6 mm; the radius of curvature R41 of the incident surface of the fourth lens element G4 satisfies -103.6mm≤R41≤-101.6mm, and the radius of curvature R42 of the exit surface satisfies -26.8mm≤R42≤-26.2mm; the radius of curvature R51 of the incident surface of the fifth lens element G5 satisfies 13.5mm≤R51≤13.8mm, and the radius of curvature R52 of the exit surface satisfies 174.3mm≤R52≤177.7mm; the radius of curvature R61 of the incident surface of the sixth lens element G6 satisfies 174.3mm≤R61≤177.7mm, and the radius of curvature R62 of the exit surface satisfies 7.6mm≤R62≤7. 8mm; the curvature radius R71 of the incident surface of the seventh lens element G7 satisfies -17.5mm≤R71≤-17.1mm, and the curvature radius R72 of the exit surface satisfies -7.4mm≤R72≤-7.2mm; the curvature radius R81 of the incident surface of the eighth lens element G8 satisfies 13.8mm≤R81≤14.2mm, and the curvature radius R82 of the exit surface satisfies 31.4mm≤R82≤32.1mm; the curvature radius R91 of the incident surface of the ninth lens element G9 satisfies -71.5mm≤R91≤-70.1mm, and the curvature radius R92 of the exit surface satisfies 13.8mm≤R92≤14.2mm m; the radius of curvature R101 of the incident surface of the tenth lens G10 satisfies 13.8 mm ≤ R101 ≤ 14.2 mm, and the radius of curvature R102 of the exit surface satisfies -12.3 mm ≤ R102 ≤ -12.0 mm; the radius of curvature R111 of the incident surface of the eleventh lens G11 is infinite, and the radius of curvature R112 of the exit surface satisfies -21.8 mm ≤ R112 ≤ -21.3 mm; the radius of curvature R121 of the incident surface of the twelfth lens G12 satisfies 17.6 mm ≤ R121 ≤ 18.0 mm, and the radius of curvature R122 of the exit surface satisfies 87.7 mm ≤ R122 ≤ 89.4 mm.

[0178] In the first group of cemented lenses, the curvature radius R51 of the incident surface of G5 and the curvature radius R62 of the exit surface of G6 satisfy 1.7<R51 / R62<1.9; in the second group of cemented lenses, the curvature radius R91 of the incident surface of G9 and the curvature radius R102 of the exit surface of G10 satisfy 5.6<R91 / R102<6.0.

[0179] The center thickness GT1 of the first lens G1 satisfies 4.3mm≤GT1≤4.5mm; the center thickness GT2 of the second lens G2 satisfies 1.4mm≤GT1≤1.5mm; the center thickness GT3 of the third lens G3 satisfies 1.2mm≤GT1≤1.3mm; the center thickness GT4 of the fourth lens G4 satisfies 2.2mm≤GT1≤2.3mm; the center thickness GT5 of the fifth lens G5 satisfies 1.2mm≤GT1≤1.3mm; the center thickness GT6 of the sixth lens G6 satisfies 1.4mm≤GT1≤1.5mm; the center thickness GT6 of the seventh lens G7 satisfies 1.4mm≤GT1≤1.5mm; The center thickness GT7 of G7 satisfies 1.4 mm ≤ GT1 ≤ 1.5 mm; the center thickness GT8 of the eighth lens G8 satisfies 4.0 mm ≤ GT1 ≤ 4.2 mm; the center thickness GT9 of the ninth lens G9 satisfies 1.4 mm ≤ GT1 ≤ 1.5 mm; the center thickness GT10 of the tenth lens G10 satisfies 3.7 mm ≤ GT1 ≤ 3.8 mm; the center thickness GT11 of the eleventh lens G11 satisfies 2.2 mm ≤ GT1 ≤ 2.4 mm; and the center thickness GT12 of the twelfth lens G12 satisfies 2.6 mm ≤ GT1 ≤ 2.8 mm.

[0180] In the first cemented lens group, the center thickness GT5 of the fifth lens G5 and the center thickness GT6 of the sixth lens G6 satisfy 0.8<GT5 / GT6<1.0; in the second cemented lens group, the center thickness GT9 of the ninth lens G9 and the center thickness GT10 of the tenth lens G10 satisfy 0.35<GT5 / GT6<0.45.

[0181] The air spacing between the lenses is as follows: the air spacing distance AT1 between the first lens G1 and the second lens G2 along the optical axis satisfies 0.09mm≤AT1≤0.10mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis satisfies 3.90mm≤AT2≤3.99mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis satisfies 3.46mm≤AT3≤3.54mm; the air spacing distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis satisfies 0.09mm≤AT4≤0.10mm; the fifth lens G5 and the sixth lens G6 are cemented lenses; the air spacing distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis satisfies 3.34mm≤AT5≤3.42mm; the air spacing distance AT5 between the aperture stop 10 and the seventh lens G7 along the optical axis satisfies Distance AT6 satisfies 0.29 mm ≤ AT6 ≤ 0.30 mm; an air distance AT7 between the seventh lens G7 and the eighth lens G8 along the optical axis satisfies 1.62 mm ≤ AT7 ≤ 1.66 mm; an air distance AT8 between the eighth lens G8 and the ninth lens G9 along the optical axis satisfies 2.65 mm ≤ AT8 ≤ 2.71 mm; the ninth lens G9 and the tenth lens G10 are a cemented lens; an air distance AT9 between the tenth lens G10 and the eleventh lens G11 along the optical axis satisfies 0.09 mm ≤ AT9 ≤ 0.10 mm; an air distance AT10 between the eleventh lens G11 and the twelfth lens G12 along the optical axis satisfies 0.09 mm ≤ AT10 ≤ 0.10 mm; and an air distance BFL between the twelfth lens G12 and the image plane along the optical axis satisfies 8.63 mm ≤ BFL ≤ 8.80 mm.

[0182] An air distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis and an air distance AT6 between the aperture stop 10 and the seventh lens G7 along the optical axis satisfy 3.63<AT5+AT6<3.72.

[0183] An air distance BFL between the twelfth lens G12 and the image plane along the optical axis and a total optical length TTL of the system satisfy 0.16<BFL / TTL<0.8.

[0184] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 satisfies 39.9 mm ≤ f1 ≤ 40.8 mm; the focal length f2 of the second lens G2 satisfies -15.5 mm ≤ f2 ≤ -15.1 mm; the focal length f3 of the third lens G3 satisfies -12.1 mm ≤ f3 ≤ -11.8 mm; the focal length f4 of the fourth lens G4 satisfies 53.3 mm ≤ f4 ≤ 54.4 mm; the focal length f5 of the fifth lens G5 satisfies 22.4 mm ≤ f5 ≤ 22.9 mm; and the focal length f6 of the sixth lens G6 satisfies -13.8 mm ≤ f6 ≤ -13.4 mm. The focal length f7 of the seventh lens G7 satisfies 19.2 mm ≤ f7 ≤ 19.7 mm; the focal length f8 of the eighth lens G8 satisfies 30.8 mm ≤ f8 ≤ 31.5 mm; the focal length f9 of the ninth lens G9 satisfies -20.1 mm ≤ f9 ≤ -19.6 mm; the focal length f10 of the tenth lens G10 satisfies 131.4 mm ≤ f10 ≤ 134.0 mm; the focal length f11 of the eleventh lens G11 satisfies 24.2 mm ≤ f11 ≤ 24.8 mm; and the focal length f12 of the twelfth lens G12 satisfies 26.1 mm ≤ f12 ≤ 26.7 mm.

[0185] The focal length f1 of the first lens G1 satisfies 7.4<f1 / f<7.8 with the focal length f of the lens; the focal length f2 of the second lens G2 satisfies 2.8<|f2 / f|<3.0 with the focal length f of the lens; the focal length f3 of the third lens G3 satisfies 2.2<|f3 / f|<2.4 with the focal length f of the lens; the focal length f4 of the fourth lens G4 satisfies 9.9<f4 / f<10.4 with the focal length f5 of the fifth lens G5 satisfies 4.1<f5 / f<4.4 with the focal length f6 of the sixth lens G6 satisfies 2.5<|f6 / f|<2.7 with the focal length f7 of the lens; The focal length f7 of G7 satisfies 3.5<f7 / f<3.7 with the focal length f of the lens; the focal length f8 of the eighth lens G8 satisfies 5.7<f8 / f<6.0 with the focal length f of the lens; the focal length f9 of the ninth lens G9 satisfies 3.6<|f9 / f|<3.9 with the focal length f of the lens; the focal length f10 of the tenth lens G10 satisfies 24.5<f10 / f<25.3 with the focal length f11 of the eleventh lens G11 satisfies 4.5<f11 / f<4.8 with the focal length f12 of the twelfth lens G12 satisfies 4.8<f12 / f<5.1 with the focal length f12 of the lens.

[0186] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 satisfies 1.94≤N1≤1.96, and the Abbe number V1 satisfies 17.8≤V1≤18.0; the refractive index N2 of the second lens G2 satisfies 1.89≤N2≤1.91, and the Abbe number V2 satisfies 31.2≤V2≤31.4; the refractive index N3 of the third lens G3 satisfies 1.87≤N3≤1.89, and the Abbe number V3 satisfies 39.1≤V 3≤39.3; the refractive index N4 of the fourth lens element G4 satisfies 1.65≤N4≤1.67, and the Abbe number V4 satisfies 57.2≤V4≤57.4; the refractive index N5 of the fifth lens element G5 satisfies 1.60≤N5≤1.62, and the Abbe number V5 satisfies 56.6≤V5≤56.8; the refractive index N6 of the sixth lens element G6 satisfies 1.56≤N6≤1.58, and the Abbe number V6 satisfies 42.7≤V6≤42.9; The refractive index N7 of the seventh lens G7 satisfies 1.61≤N7≤1.63, and the Abbe number V7 satisfies 56.6≤V7≤57.8; the refractive index N8 of the eighth lens G8 satisfies 1.73≤N8≤1.75, and the Abbe number V8 satisfies 28.2≤V8≤28.4; the refractive index N9 of the ninth lens G9 satisfies 1.99≤N9≤2.0, and the Abbe number V9 satisfies 25.3≤V9≤25.5; the refractive index N9 of the tenth lens G10 satisfies The refractive index N10 satisfies 1.48≤N10≤1.50, and the Abbe number V10 satisfies 70.3≤V10≤70.5; the refractive index N11 of the eleventh lens G11 satisfies 1.87≤N11≤1.89, and the Abbe number V11 satisfies 39.1≤V11≤39.3; the refractive index N12 of the twelfth lens G12 satisfies 1.82≤N12≤1.84, and the Abbe number V12 satisfies 42.6≤V12≤43.8.

[0187] Example 3

[0188] In some embodiments, the focal length f of the optical lens is 5.3 mm; the aperture number Fno of the optical lens is F2.0; the field of view angle FOV of the optical lens is 82.7°; the image side target surface size IMG is 9.4 mm; the working band WL of the optical lens satisfies 630 nm ≤ WL ≤ 650 nm; and the total optical length TTL of the optical lens is 52.3 mm.

[0189] The focal length fa of the first lens group 1 is -8.80 mm; the focal length fb of the second lens group 2 is 13.47 mm; and the focal length fc of the third lens group 3 is 11.70 mm.

[0190] The axial distance d12 between the first lens group 1 and the second lens group 2 meets 3.50 mm; the axial distance d23 between the second lens group 2 and the third lens group 3 meets 2.68 mm.

[0191] The curvature radii of each lens are as follows: the curvature radius R11 of the incident surface of the first lens G1 is 19.71mm, and the curvature radius R12 of the exit surface is 36.90mm; the curvature radius R21 of the incident surface of the second lens G2 is 16.01mm, and the curvature radius R22 of the exit surface is 7.09mm; the curvature radius R31 of the incident surface of the third lens G3 is 18.31mm, and the curvature radius R32 of the exit surface is 6. 46mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -102.56mm, and the curvature radius R42 of the exit surface is -26.53mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 13.64mm, and the curvature radius R52 of the exit surface is 176.00mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 176.00mm, and the curvature radius R62 of the exit surface is 7.69m m; the curvature radius R71 of the incident surface of the seventh lens G7 is -17.28mm, and the curvature radius R72 of the exit surface is -7.33mm; the curvature radius R81 of the incident surface of the eighth lens G8 is 14.02mm, and the curvature radius R82 of the exit surface is 31.77mm; the curvature radius R91 of the incident surface of the ninth lens G9 is -70.80mm, and the curvature radius R92 of the exit surface is 14.02mm; the curvature radius R91 of the incident surface of the tenth lens G9 is -70.80mm, and the curvature radius R92 of the exit surface is 14.02mm; The curvature radius R101 of the incident surface of lens G10 is 14.02 mm, and the curvature radius R102 of the exit surface is -12.15 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is infinite, and the curvature radius R112 of the exit surface is -21.51 mm; the curvature radius R121 of the incident surface of the twelfth lens G12 is 17.81 mm, and the curvature radius R122 of the exit surface is 88.55 mm.

[0192] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 4.37 mm; the center thickness GT2 of the second lens G2 is 1.43 mm; the center thickness GT3 of the third lens G3 is 1.25 mm; the center thickness GT4 of the fourth lens G4 is 2.27 mm; the center thickness GT5 of the fifth lens G5 is 1.24 mm; the center thickness GT6 of the sixth lens G6 is 1.49 mm; the center thickness GT7 of the seventh lens G7 is 1.44 mm; the center thickness GT8 of the eighth lens G8 is 4.09 mm; the center thickness GT9 of the ninth lens G9 is 1.44 mm; the center thickness GT10 of the tenth lens G10 is 3.74 mm; the center thickness GT11 of the eleventh lens G11 is 2.30 mm; and the center thickness GT12 of the twelfth lens G12 is 2.68 mm.

[0193] The air spacing between the lenses is as follows: the air spacing distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.10 mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 3.94 mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 3.50 mm; the air spacing distance AT4 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.10 mm; the fifth lens G5 and the sixth lens G6 are cemented lenses; the air spacing distance AT5 between the sixth lens G6 and the aperture stop 10 along the optical axis is 3.38 mm; the air spacing distance AT5 between the aperture stop 10 and the seventh lens G7 along the optical axis is 3.70 mm. The air distance AT6 along the optical axis is 0.29 mm; the air distance AT7 along the optical axis between the seventh lens element G7 and the eighth lens element G8 is 1.64 mm; the air distance AT8 along the optical axis between the eighth lens element G8 and the ninth lens element G9 is 2.68 mm; the ninth lens element G9 and the tenth lens element G10 are a cemented lens; the air distance AT9 along the optical axis between the tenth lens element G10 and the eleventh lens element G11 is 0.10 mm; the air distance AT10 along the optical axis between the eleventh lens element G11 and the twelfth lens element G12 is 0.10 mm; and the air distance BFL along the optical axis between the twelfth lens G12 and the image plane is 8.71 mm.

[0194] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 40.35 mm; the focal length f2 of the second lens G2 is -15.33 mm; the focal length f3 of the third lens G3 is -11.97 mm; the focal length f4 of the fourth lens G4 is 53.85 mm; the focal length f5 of the fifth lens G5 is 22.67 mm; the focal length f6 of the sixth lens G6 is -13.58 mm; the focal length f7 of the seventh lens G7 is 19.47 mm; the focal length f8 of the eighth lens G8 is 31.15 mm; the focal length f9 of the ninth lens G9 is -19.82 mm; the focal length f10 of the tenth lens G10 is 132.74 mm; the focal length f11 of the eleventh lens G11 is 24.50 mm; and the focal length f12 of the twelfth lens G12 is 26.39 mm.

[0195] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.95, and the Abbe number V1 is 17.9; the refractive index N2 of the second lens G2 is 1.90, and the Abbe number V2 is 31.3; the refractive index N3 of the third lens G3 is 1.88, and the Abbe number V3 is 39.2; the refractive index N4 of the fourth lens G4 is 1.66, and the Abbe number V4 is 57.3; the refractive index N5 of the fifth lens G5 is 1.61, and the Abbe number V5 is 56.7; the refractive index N6 of the sixth lens G6 is 1.57, and the Abbe number V6 is 4 The seventh lens G7 has a refractive index N7 of 1.62 and an Abbe number V7 of 56.7. The eighth lens G8 has a refractive index N8 of 1.74 and an Abbe number V8 of 28.3. The ninth lens G9 has a refractive index N9 of 2.00 and an Abbe number of 25.4. The tenth lens G10 has a refractive index N10 of 1.49 and an Abbe number V10 of 70.4. The eleventh lens G11 has a refractive index N11 of 1.88 and an Abbe number V11 of 39.2. The twelfth lens G12 has a refractive index N12 of 1.83 and an Abbe number of 42.7.

[0196] Combined with the field curvature diagram shown in FIG16 , the field curvature value of the optical lens of this example is greater than −0.05 mm and less than 0.05 mm within the full field of view.

[0197] Combined with the distortion diagram shown in FIG17 , the distortion of the optical lens of this example is less than 0.5%, and the full-frame distortion of the imaging is small, which helps to ensure the authenticity of the imaging.

[0198] Combined with the MTF curve shown in FIG18 , the optical lens of this example has a contrast ratio greater than or equal to 0.3 at a spatial frequency of 200 cycles / mm over the entire field of view, indicating extremely high resolution.

[0199] In conjunction with the relative illumination curve shown in Figure 19, the horizontal axis at 0mm represents the center field of view, and 4.79mm represents the edge field of view. The optical lens in this example has a relative illumination of 100% at the center field of view, and a relative illumination of greater than 76% at the edge field of view. Thus, the relative illumination of this optical lens across the entire field of view exceeds 76%, ensuring uniformity across the entire image. Even at the edges of the image, there is no vignetting, and the difference in brightness between the edges and the center is minimal.

[0200] Example 4

[0201] The present disclosure also provides an electronic device comprising the optical lens of the above embodiment. The structure, function and effect of the optical lens provided in this embodiment are the same as those of the above embodiment, and the details can be referred to the above embodiment, which will not be described again here.

[0202] In some embodiments, the electronic device of the present disclosure is a camera, which can be a monocular camera, a binocular camera, or a 3D camera.

[0203] In the above description, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An optical lens, characterized in that: include: An aperture stop and a plurality of lenses coaxially arranged in sequence from the object side to the image side, wherein the aperture stop has a plurality of lenses on the side facing the object side to form an aperture front lens group; The aperture stop has a plurality of lenses on the side facing the image side, forming an aperture rear lens group; the number of lenses in the aperture front lens group is the same as the number of lenses in the aperture rear lens group; the aperture front lens group has a negative optical power, and the aperture rear lens group has a positive optical power; The lens closest to the object side has positive optical power.

2. The optical lens according to claim 1, characterized in that: Among the plurality of lenses, two lenses closest to the image side have positive refractive power.

3. The optical lens according to claim 2, characterized in that: The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are coaxially arranged in sequence from the object side to the image side; the first lens is the lens closest to the object side; the eleventh lens and the twelfth lens are the two lenses closest to the image side; The aperture stop is located between the sixth lens and the seventh lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens form the stop front lens group, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens form the stop rear lens group.

4. The optical lens according to claim 3, characterized in that: The second lens and the third lens have negative refractive power respectively; and the fourth lens has positive refractive power.

5. The optical lens according to claim 3, characterized in that: The fifth lens and the sixth lens are a cemented lens group, and a difference between an Abbe number V5 of the fifth lens and an Abbe number V6 of the sixth lens is greater than 15.

6. The optical lens according to claim 3, characterized in that: A surface of the seventh lens facing the aperture stop is a concave surface.

7. The optical lens according to claim 3, characterized in that: The ninth lens and the tenth lens are a cemented lens group, and a difference between an Abbe number V9 of the ninth lens and an Abbe number V10 of the tenth lens is greater than 45.

8. The optical lens according to claim 3, characterized in that: The first lens, the second lens and the third lens form a first lens group, and the focal length fa of the first lens group satisfies -25mm≤fa≤-5mm; The fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens form a second lens group, and the focal length fb of the second lens group satisfies 5mm≤fb≤25mm; The ninth lens, the tenth lens, the eleventh lens, and the twelfth lens form a third lens group, and a focal length fc of the third lens group satisfies 5 mm≤fc≤25 mm.

9. The optical lens according to claim 8, characterized in that: The focal length fa of the first lens group satisfies -15mm≤fa≤-5mm; The focal length fb of the second lens group satisfies 10 mm ≤ fb ≤ 20 mm; The focal length fc of the third lens group satisfies 10 mm≤fc≤20 mm.

10. The optical lens according to claim 8, characterized in that: The focal length fa of the first lens group and the focal length f of the optical lens satisfy 0.7<|fa / f|<5; The focal length fb of the second lens group and the focal length f of the optical lens satisfy 1.5<fb / f<6; The focal length fc of the third lens group and the focal length f of the optical lens satisfy 1.5<fb / f<6.

11. The optical lens according to any one of claims 3 to 10, characterized in that: The first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a convex-concave lens, the fourth lens is a convex-concave lens, the fifth lens is a convex-concave lens, the sixth lens is a convex-concave lens, the seventh lens is a convex-concave lens, the eighth lens is a convex-concave lens, the ninth lens is a biconcave lens, the tenth lens is a biconvex lens, the eleventh lens is a plano-convex lens, and the twelfth lens is a convex-concave lens.

12. The optical lens according to any one of claims 3 to 10, characterized in that: The curvature radius R11 of the incident surface of the first lens satisfies 15mm≤R11≤25mm, and the curvature radius R12 of the exit surface satisfies 30mm≤R12≤40mm; the curvature radius R21 of the incident surface of the second lens satisfies 10mm≤R21≤20mm, and the curvature radius R22 of the exit surface satisfies 5mm≤R22≤15mm; the curvature radius R31 of the incident surface of the third lens satisfies 15mm≤R31≤25mm, and the curvature radius R32 of the exit surface satisfies 5mm≤R32≤15mm; the fourth lens The curvature radius R41 of the incident surface satisfies -110mm≤R41≤-100mm, and the curvature radius R42 of the exit surface satisfies -30mm≤R42≤-20mm; the curvature radius R51 of the incident surface of the fifth lens satisfies 10mm≤R51≤20mm, and the curvature radius R52 of the exit surface satisfies 170mm≤R52≤180mm; the curvature radius R61 of the incident surface of the sixth lens satisfies 170mm≤R61≤180mm, and the curvature radius R62 of the exit surface satisfies 5mm≤R62≤15mm; The curvature radius R71 of the incident surface of the seventh lens satisfies -25mm≤R71≤-15mm, and the curvature radius R72 of the exit surface satisfies -15mm≤R72≤-5mm; the curvature radius R81 of the incident surface of the eighth lens satisfies 10mm≤R81≤20mm, and the curvature radius R82 of the exit surface satisfies 30mm≤R82≤40mm; the curvature radius R91 of the incident surface of the ninth lens satisfies -75mm≤R91≤-65mm, and the curvature radius R92 of the exit surface satisfies 10mm≤R92≤20mm; The curvature radius R101 of the incident surface of the tenth lens satisfies 10mm≤R101≤20mm, and the curvature radius R102 of the exit surface satisfies -20mm≤R102≤-10mm; the curvature radius R111 of the incident surface of the eleventh lens satisfies infinity, and the curvature radius R112 of the exit surface satisfies -25mm≤R112≤-15mm; the curvature radius R121 of the incident surface of the twelfth lens satisfies 15mm≤R121≤25mm, and the curvature radius R122 of the exit surface satisfies 65mm≤R122≤75mm.

13. The optical lens according to any one of claims 3 to 10, characterized in that: A curvature radius R51 of the incident surface of the fifth lens and a curvature radius R62 of the exit surface of the sixth lens satisfy 0.5<R51 / R62<5; a curvature radius R91 of the incident surface of the ninth lens and a curvature radius R102 of the exit surface of the tenth lens satisfy 2.5<R91 / R102<7.

5.

14. The optical lens according to any one of claims 3 to 10, characterized in that: The center thickness GT1 of the first lens satisfies 3mm≤GT1≤6mm; the center thickness GT2 of the second lens satisfies 1mm≤GT2≤4mm; the center thickness GT3 of the third lens satisfies 1mm≤GT3≤4mm; the center thickness GT4 of the fourth lens satisfies 2mm≤GT4≤5mm; the center thickness GT5 of the fifth lens satisfies 1mm≤GT5≤4mm; the center thickness GT6 of the sixth lens satisfies 1mm≤GT6≤4mm; the center thickness GT7 of the seventh lens satisfies 1mm≤GT7≤4mm; the center thickness GT8 of the eighth lens satisfies 3mm≤GT≤6mm; the center thickness GT9 of the ninth lens satisfies 1mm≤GT9≤4mm; the center thickness GT10 of the tenth lens satisfies 2mm≤GT10≤5mm; the center thickness GT11 of the eleventh lens satisfies 1mm≤GT1≤4mm; and the center thickness GT12 of the twelfth lens satisfies 2mm≤GT1≤5mm.

15. The optical lens according to any one of claims 3 to 10, characterized in that: The central thickness GT5 of the fifth lens and the central thickness GT6 of the sixth lens satisfy 0.2<GT5 / GT6<4; the central thickness GT9 of the ninth lens and the central thickness GT10 of the tenth lens satisfy 0.2<GT5 / GT6<2.

16. The optical lens according to any one of claims 3 to 10, characterized in that: The air spacing distance AT1 between the first lens and the second lens along the optical axis satisfies 0mm≤AT1≤2mm; the air spacing distance AT2 between the second lens and the third lens along the optical axis satisfies 3mm≤AT2≤5mm; the air spacing distance AT3 between the third lens and the fourth lens along the optical axis satisfies 3mm≤AT3≤5mm; the air spacing distance AT4 between the fourth lens and the fifth lens along the optical axis satisfies 0mm≤AT4≤2mm; the air spacing distance AT5 between the sixth lens and the aperture stop along the optical axis satisfies 3mm≤AT5≤5mm; the air spacing distance AT6 between the aperture stop and the seventh lens along the optical axis satisfies 3mm≤AT6≤5mm. The air spacing distance AT6 satisfies 0mm≤AT6≤2mm; the air spacing distance AT7 between the seventh lens and the eighth lens along the optical axis satisfies 0mm≤AT7≤2mm; the air spacing distance AT8 between the eighth lens and the ninth lens along the optical axis satisfies 2mm≤AT8≤4mm; the air spacing distance AT9 between the tenth lens and the eleventh lens along the optical axis satisfies 0mm≤AT9≤2mm; the air spacing distance AT10 between the eleventh lens and the twelfth lens along the optical axis satisfies 0mm≤AT10≤2mm; the air spacing distance BFL between the twelfth lens and the image plane along the optical axis satisfies 8mm≤BFL≤10mm.

17. The optical lens according to any one of claims 3 to 10, characterized in that: An air spacing distance AT5 between the sixth lens and the aperture stop along the optical axis and an air spacing distance AT6 between the aperture stop and the seventh lens along the optical axis satisfy 3<AT5+AT6<7.

18. The optical lens according to any one of claims 3 to 10, characterized in that: The air spacing distance BFL between the twelfth lens and the image plane along the optical axis and the total optical length TTL of the optical lens satisfy 0.13<BFL / TTL<0.

25.

19. The optical lens according to any one of claims 3 to 10, characterized in that: The focal length f1 of the first lens satisfies 35mm≤f1≤45mm; the focal length f2 of the second lens satisfies -20mm≤f2≤-10mm; the focal length f3 of the third lens satisfies -20mm≤f3≤-10mm; the focal length f4 of the fourth lens satisfies 10mm≤f4≤20mm; the focal length f5 of the fifth lens satisfies 15mm≤f5≤25mm; the focal length f6 of the sixth lens satisfies -20mm≤f6≤-10mm; The focal length f7 of the seventh lens satisfies 15mm≤f7≤25mm; the focal length f8 of the eighth lens satisfies 25mm≤f8≤35mm; the focal length f9 of the ninth lens satisfies -25mm≤f9≤-15mm; the focal length f10 of the tenth lens satisfies 130mm≤f10≤140mm; the focal length f11 of the eleventh lens satisfies 20mm≤f11≤30mm; and the focal length f12 of the twelfth lens satisfies 20mm≤f12≤30mm.

20. The optical lens according to any one of claims 3 to 10, characterized in that: The focal length f1 of the first lens satisfies 5.5<f1 / f<11.5 with the focal length f of the optical lens; the focal length f2 of the second lens satisfies 1.5<|f2 / f|<5 with the focal length f of the optical lens; the focal length f3 of the third lens satisfies 1.5<|f3 / f|<5 with the focal length f of the optical lens; the focal length f4 of the fourth lens satisfies 1.5<f4 / f<5 with the focal length f of the optical lens; the focal length f5 of the fifth lens satisfies 2.5<f5 / f<6.5 with the focal length f of the optical lens; the focal length f6 of the sixth lens satisfies 1.5<|f6 / f|<5 with the focal length f of the optical lens; The focal length f7 of the seventh lens satisfies 2.5<f7 / f<6.5 with the focal length f of the optical lens; the focal length f8 of the eighth lens satisfies 4<f8 / f<9 with the focal length f of the optical lens; the focal length f9 of the ninth lens satisfies 2.5<|f9 / f|<6.5 with the focal length f of the optical lens; the focal length f10 of the tenth lens satisfies 21.5<f10 / f<35 with the focal length f of the optical lens; the focal length f11 of the eleventh lens satisfies 3<f11 / f<7.5 with the focal length f of the optical lens; the focal length f12 of the twelfth lens satisfies 3<f12 / f<7.5 with the focal length f of the optical lens.

21. The optical lens according to claim 3, characterized in that: The refractive index N1 of the first lens satisfies 1.9≤N1≤2.0, and the Abbe number V1 satisfies 15≤V1≤20; the refractive index N2 of the second lens satisfies 1.9≤N2≤2.0, and the Abbe number V2 satisfies 30≤V2≤35; the refractive index N3 of the third lens satisfies 1.8≤N3≤1.9, and the Abbe number V3 satisfies 35≤V3≤40; the refractive index N4 of the fourth lens satisfies 1.6≤N4≤1.7, and the Abbe number V4 satisfies 55≤V4≤60; the refractive index N5 of the fifth lens satisfies 1.6≤N5≤1.7, and the Abbe number V5 satisfies 55≤V5≤60; the refractive index N6 of the sixth lens satisfies 1.5≤N6≤1.6, and the Abbe number V6 satisfies 40≤V6≤45; The refractive index N7 satisfies 1.6≤N7≤1.7, and the Abbe number V7 satisfies 55≤V7≤60; the refractive index N8 of the eighth lens satisfies 1.7≤N8≤1.8, and the Abbe number V8 satisfies 25≤V8≤30; the refractive index N9 of the ninth lens satisfies 1.9≤N9≤2.0, and the Abbe number V9 satisfies 25≤V9≤30; the refractive index N10 of the tenth lens satisfies 1.4≤N10≤1.5, and the Abbe number V10 satisfies 70≤V10≤75; the refractive index N11 of the eleventh lens satisfies 1.8≤N11≤1.9, and the Abbe number V11 satisfies 35≤V11≤40; the refractive index N12 of the twelfth lens satisfies 1.8≤N12≤1.9, and the Abbe number V12 satisfies 40≤V12≤45.

22. The optical lens according to any one of claims 1 to 10, characterized in that: The focal length f of the optical lens satisfies 3mm≤f≤8mm; the aperture number Fno of the optical lens satisfies F1.2≤Fno≤F16; the field of view FOV of the optical lens satisfies 70°≤FOV≤120°; and the image side target surface size IMG of the optical lens satisfies 8mm≤IMG≤16mm.

23. The optical lens according to claim 22, characterized in that: The focal length f of the optical lens satisfies 4mm≤f≤6mm; the aperture number Fno of the optical lens satisfies F1.2≤Fno≤F16; the field of view FOV of the optical lens satisfies 75°≤FOV≤90°; the image side target surface size IMG of the optical lens satisfies 8mm≤IMG≤11mm; the working band WL of the optical lens satisfies 600nm≤WL≤650nm; and the total optical length TTL of the optical lens satisfies 45mm≤TTL≤55mm.

24. The optical lens according to claim 23, characterized in that: The focal length f of the optical lens and the image target surface size IMG of the optical lens satisfy 0.2<f / IMG<0.

9.

25. The optical lens according to any one of claims 1 to 10, characterized in that: All lenses of the optical lens are spherical lenses.

26. The optical lens according to any one of claims 1 to 10, characterized in that: All lenses of the optical lens are glass lenses.

27. The optical lens according to any one of claims 1 to 10, characterized in that: The field curvature value of the optical lens is greater than -0.05mm and less than 0.05mm, and the distortion of the optical lens is less than 0.5%; The MTF value of the optical lens has a contrast ratio greater than 0.3 at 200 lp / mm.

28. The optical lens according to any one of claims 1 to 10, characterized in that: The full-field relative illumination of the optical lens is greater than 78%.

29. An electronic device, characterized in that: The electronic device comprises the optical lens according to any one of claims 1-28.

30. The electronic device according to claim 29, characterized in that The electronic device is a camera.

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