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 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 and an eleventh lens which are sequentially and coaxially arranged from the object side to the image side. The first lens has positive focal power, and the second lens and the third lens have negative focal power; the fourth lens and the fifth lens are cemented lenses, the fourth lens has negative focal power, and the fifth lens has positive focal power; the sixth lens, the seventh lens, the eighth lens and the ninth lens all have positive focal power; the tenth lens and the eleventh lens respectively have negative focal power, and the half field angle of the optical lens is 30-40 degrees; the image space target surface size IMG of the optical lens is 8-14 mm; the effective focal length f of the optical lens is 6-10 mm.

Description

Technical Field

[0001] The present disclosure relates to the field of optical technology, and in particular to an optical lens and an electronic device. Background Art

[0002] With the development of image processing and computer technology, machine vision technology has become increasingly widely used due to its advantages such as high precision, fast speed, and high stability. Lenses are an important component of machine vision technology, and the requirements for lenses are becoming increasingly higher.

[0003] Among them, the lens resolution directly affects the detection accuracy; the lens relative illumination affects the detection speed and detection accuracy; the lens temperature drift characteristics also affect the detection precision and accuracy. The lens field of view angle directly affects the shooting range.

[0004] Therefore, it is necessary to provide a wide-angle lens with high resolution, high uniformity and low temperature drift. Summary of the Invention

[0005] The present disclosure provides an optical lens and an electronic device. The optical lens is clearly formed within a large field of view angle and has the characteristics of high resolution, high uniformity and low temperature drift.

[0006] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0007] A first aspect of the present disclosure provides an optical lens, comprising: 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, and an eleventh lens, which are coaxially arranged in sequence from the object side to the image side;

[0008] The first lens has positive focal power, and the second lens and the third lens have negative focal power; the fourth lens and the fifth lens are cemented lenses, and the difference in Abbe numbers between the fourth lens and the fifth lens is greater than 25; the fourth lens has negative focal power, and the fifth lens has positive focal power; the sixth lens, the seventh lens, the eighth lens, and the ninth lens all have positive focal power; an aperture stop is provided between the seventh lens and the eighth lens, and the incident surface of the eighth lens facing the aperture stop is a concave surface; the tenth lens and the eleventh lens are cemented lenses, and the difference in Abbe numbers between the tenth lens and the eleventh lens is greater than 45; the tenth lens and the eleventh lens each have negative focal power;

[0009] The eleven lenses of the optical lens include at least two lens groups, and each lens group includes at least two lenses with the same refractive index and Abbe number;

[0010] The half field angle of the optical lens is 30° to 40°; the image target surface size IMG of the optical lens is 8mm to 14mm; and the effective focal length f of the optical lens is 6mm to 10mm.

[0011] Compared with the prior art, the optical lens provided by the first aspect of the present disclosure has the following advantages:

[0012] The optical lens provided herein comprises eleven lenses arranged coaxially from the object side to the image side. The first lens has positive power, which can converge off-axis light beams at large angles while reducing the optical path aperture, thereby miniaturizing the optical path structure. The second and third lenses have negative power, which, combined with the positive power of the first lens, form a positive and negative power combination, effectively deflecting the light angle and reducing the angle between the light beam and the optical axis.

[0013] The fourth and fifth lenses are cemented together, with the fourth lens having negative optical power and the fifth lens having positive optical power. They form the first cemented lens group of the eleven optical elements. The difference in Abbe numbers between the fourth and fifth lenses is greater than 25, further eliminating chromatic aberration introduced by the initial optical path.

[0014] The sixth, seventh, eighth, and ninth lenses all have positive optical power. Through reasonable design and material selection, the positive optical power lenses minimize the negative impact of temperature changes on the optical system, thereby improving the reliability and imaging accuracy of the equipment in extreme environments.

[0015] An aperture stop is provided between the seventh and eighth lenses. The incident surface of the eighth lens facing the aperture stop is concave, which helps to reduce the angle of light incident on the lens surface and correct system aberrations. The tenth and eleventh lenses are cemented lenses, and the difference in Abbe numbers between the tenth and eleventh lenses is greater than 45; the tenth and eleventh lenses each have negative optical power. It can effectively correct chromatic aberration of the light beam converging on the image plane, ensuring that the focus positions of light rays of different wavelengths coincide. The last two lenses of the optical lens are double-cemented, which can correct chromatic aberration and field curvature for large aperture systems and improve edge sharpness.

[0016] By setting lenses with the same refractive index, their refractive index changes in a consistent manner when the temperature changes. The Abbe number, a parameter that measures the chromatic aberration of a material, is the same. Setting the same Abbe number means consistent dispersion characteristics. This synchronizes the dispersion changes with temperature, helping to reduce chromatic aberration caused by temperature changes and improve the thermal stability of the optical lens.

[0017] The disclosed lens combination structure effectively balances various aberrations, thereby improving the imaging performance and thermal stability of the optical system. The disclosed optical lens has clear imaging within a wide field of view, while also having high resolution, high uniformity, and athermalization characteristics.

[0018] As an improvement to the above optical lens disclosed herein, the refractive index and Abbe number of the second lens, the eighth lens, and the ninth lens are respectively the same;

[0019] The refractive index and Abbe number of the fourth lens and the sixth lens are respectively the same.

[0020] As an improvement to the above optical lens disclosed herein, the first lens, the second lens, and the third lens form a front lens group;

[0021] The fourth lens, the fifth lens, the sixth lens and the seventh lens form a middle lens group;

[0022] The eighth lens, the ninth lens, the tenth lens, and the eleventh lens form a rear lens group;

[0023] The front lens group has negative optical power; the middle lens group and the rear lens group each have positive optical power;

[0024] An axial distance d12 between the front lens group and the middle lens group, and an axial distance d23 between the middle lens group and the rear lens group satisfy d23>d12.

[0025] As an improvement of the above optical lens disclosed in the present invention, the focal length fa of the front lens group is -18mm to -8mm;

[0026] The focal length fb of the middle lens group is 13mm to 23mm;

[0027] The focal length fc of the rear lens group is 13mm to 23mm;

[0028] An axial distance d12 between the front lens group and the middle lens group is 2 mm to 7 mm; an axial distance d23 between the middle lens group and the rear lens group is 9 mm to 14 mm.

[0029] As an improvement to the above-mentioned optical lens of the present disclosure, the focal length fa of the front lens group and the effective focal length f of the optical lens satisfy 1.50<|fa / f|<1.51, the focal length fb of the middle lens group and the effective focal length f of the optical lens satisfy 2.40<fb / f<2.45, and the focal length fc of the rear lens group and the effective focal length f of the optical lens satisfy 2.30<fc / f<2.31;

[0030] An axial distance d12 between the front lens group and the middle lens group, and an axial distance d23 between the middle lens group and the rear lens group satisfy 0.3<d12 / d23<0.4.

[0031] As an improvement to the above optical lens disclosed herein, the first lens has a positive thermo-optic coefficient, the second lens has a positive thermo-optic coefficient, and the third lens has a negative thermo-optic coefficient; the fourth lens has a negative thermo-optic coefficient, and the fifth lens has a positive thermo-optic coefficient; the sixth lens has a negative thermo-optic coefficient; the seventh lens has a negative thermo-optic coefficient; the eighth lens has a positive thermo-optic coefficient, and the ninth lens has a positive thermo-optic coefficient; the tenth lens has a positive thermo-optic coefficient; and the eleventh lens has a negative thermo-optic coefficient.

[0032] The first lens, the second lens, the eighth lens, and the ninth lens have the same refractive index;

[0033] The fourth lens, the sixth lens, and the seventh lens have the same refractive index.

[0034] 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 biconvex lens, the fifth lens is a biconvex lens, the sixth lens is a biconvex lens, the seventh lens is a convex-concave lens, the eighth lens is a concave-convex lens, the ninth lens is a biconvex lens, the tenth lens is a biconvex lens, and the eleventh lens is a concave-convex lens.

[0035] As an improvement of the above-mentioned optical lens of the present disclosure, the curvature radius R11 of the incident surface of the first lens is 29.0mm~42.5mm, and the curvature radius R12 of the exit surface is 110.9mm~162.2mm; the curvature radius R21 of the incident surface of the second lens is 16.7mm~24.5mm, and the curvature radius R22 of the exit surface is 6.8mm~10.1mm; the curvature radius R31 of the incident surface of the third lens is 25.0mm~36.7mm, and the curvature radius R32 of the exit surface is 25.0mm~36.7mm. The curvature radius R32 of the incident surface of the fourth lens is 7.1mm~10.5mm; the curvature radius R41 of the incident surface of the fourth lens is -14.1mm~-9.6mm, and the curvature radius R42 of the exit surface is 12.4mm~18.2mm; the curvature radius R51 of the incident surface of the fifth lens is 12.4mm~18.2mm, and the curvature radius R52 of the exit surface is -21.7mm~-14.8mm; the curvature radius R61 of the incident surface of the sixth lens is 51.6mm~75.5mm mm, the curvature radius R62 of the exit surface is -29.3mm~-23.7mm; the curvature radius R71 of the incident surface of the seventh lens is 25.6mm~37.5mm, and the curvature radius R72 of the exit surface is 258.2mm~377.5mm; the curvature radius R81 of the incident surface of the eighth lens is -376.2mm~-257.3mm, and the curvature radius R82 of the exit surface is -28.2mm~-19.2mm; the curvature radius R 91 is 40.1mm~58.8mm, and the curvature radius R92 of the exit surface is -48.3mm~-33.0mm; the curvature radius R101 of the incident surface of the tenth lens is 26.8mm~39.2mm, and the curvature radius R102 of the exit surface is -12.0mm~-8.1mm; the curvature radius R111 of the incident surface of the eleventh lens is -12.0mm~-8.1mm, and the curvature radius R112 of the exit surface is -68.9mm~-47.1mm.

[0036] As an improvement to the above optical lens disclosed herein, a curvature radius R41 of the incident surface of the fourth lens and a curvature radius R52 of the exit surface of the fifth lens satisfy 0.4<R41 / R52<1.0;

[0037] A curvature radius R101 of the incident surface of the tenth lens and a curvature radius R112 of the exit surface of the eleventh lens satisfy 0.3<|R101 / R112|<0.9.

[0038] As an improvement to the above-mentioned optical lens disclosed in the present invention, the center thickness GT1 of the first lens is 3.3 mm to 4.9 mm; the center thickness GT2 of the second lens is 0.9 mm to 1.5 mm; the center thickness GT3 of the third lens is 0.9 mm to 1.5 mm; the center thickness GT4 of the fourth lens is 0.9 mm to 1.4 mm; the center thickness GT5 of the fifth lens is 3.6 mm to 5.3 mm; the center thickness GT6 of the sixth lens is 2.6 mm to 3.8 mm; the center thickness GT7 of the seventh lens is 1.9 mm to 2.8 mm; the center thickness GT8 of the eighth lens is 1.5 mm to 2.3 mm; the center thickness GT9 of the ninth lens is 1.5 mm to 2.4 mm; the center thickness GT10 of the tenth lens is 2.4 mm to 3.6 mm; and the center thickness GT11 of the eleventh lens is 0.8 mm to 1.2 mm.

[0039] As an improvement of the above optical lens disclosed in the present invention, the center thickness GT4 of the fourth lens and the center thickness GT5 of the fifth lens satisfy 0.16<GT4 / GT5<0.4;

[0040] The central thickness GT10 of the tenth lens and the central thickness GT11 of the eleventh lens satisfy 2.0<GT10 / GT11<4.5.

[0041] As an improvement to the above-mentioned optical lens disclosed in the present invention, the air spacing distance AT1 between the first lens and the second lens along the optical axis is 0.07mm-0.11mm; the air spacing distance AT2 between the second lens and the third lens along the optical axis is 3.40mm-5.00mm; the air spacing distance AT3 between the third lens and the fourth lens along the optical axis is 3.59mm-5.26mm; the fourth lens and the fifth lens are cemented lenses; the air spacing distance AT4 between the fifth lens and the sixth lens along the optical axis is 0.07mm-0.10mm; the air spacing distance AT5 between the sixth lens and the seventh lens along the optical axis is 0.11m m~0.18mm; the air distance AT6 between the seventh lens and the aperture stop along the optical axis is 6.57mm~9.61mm; the air distance AT7 between the aperture stop and the eighth lens along the optical axis is 2.74mm~4.02mm; the air distance AT8 between the eighth lens and the ninth lens along the optical axis is 0.07mm~0.12mm; the air distance AT9 between the ninth lens and the tenth lens along the optical axis is 0.07mm~0.11mm; the tenth lens and the eleventh lens are cemented lenses; the air distance BFL between the eleventh lens and the image plane along the optical axis is 9.05mm~13.24mm.

[0042] As an improvement to the above optical lens disclosed herein, an air distance AT6 between the seventh lens and the aperture stop along the optical axis and an air distance AT7 between the aperture stop and the eighth lens along the optical axis satisfy 9.3<AT6+AT7<13.7;

[0043] The air distance BFL between the eleventh lens and the image plane along the optical axis and the total optical length TTL of the system satisfy 0.13<BFL / TTL<0.3.

[0044] As an improvement to the above optical lens disclosed herein, the focal length f1 of the first lens is 62.7 mm to 91.6 mm; the focal length f2 of the second lens is -28.6 mm to -19.6 mm; the focal length f3 of the third lens is -22.1 mm to -15.1 mm; the focal length f4 of the fourth lens is -15.0 mm to -10.3 mm; the focal length f5 of the fifth lens is 24.5 mm to 35.8 mm; and the focal length f6 of the sixth lens is 24.5 mm to 35.8 mm. The focal length f6 of the lens is 19.7 mm to 28.8 mm; the focal length f7 of the seventh lens is 33.6 mm to 49.1 mm; the focal length f8 of the eighth lens is 33.7 mm to 49.3 mm; the focal length f9 of the ninth lens is 18.1 mm to 26.4 mm; the focal length f10 of the tenth lens is -90.7 mm to -62.0 mm; and the focal length f11 of the eleventh lens is -73.9 mm to -50.6 mm.

[0045] As an improvement to the above-mentioned optical lens of the present invention, the focal length f1 of the first lens satisfies 6.6<f1 / f<14.1 with the effective focal length f of the optical lens; the focal length f2 of the second lens satisfies 2.0<|f2 / f|<4.4 with the effective focal length f of the optical lens; the focal length f3 of the third lens satisfies 1.5<|f3 / f|<3.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens satisfies 1.0<|f4 / f|<2.4 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens satisfies 2.5<f5 / f<5.6 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens satisfies The effective focal length f of the optical lens satisfies 2.0<f6 / f<4.5; the focal length f7 of the seventh lens satisfies 3.5<f7 / f<7.6 with the effective focal length f of the optical lens; the focal length f8 of the eighth lens satisfies 3.5<f8 / f<7.6 with the effective focal length f of the optical lens; the focal length f9 of the ninth lens satisfies 1.9<f9 / f<4.1 with the effective focal length f of the optical lens; the focal length f10 of the tenth lens satisfies 6.5<|f10 / f|<1.4 with the effective focal length f of the optical lens; and the focal length f11 of the eleventh lens satisfies 5.3<f11 / f<11.4 with the effective focal length f of the optical lens.

[0046] As an improvement of the above-mentioned optical lens disclosed in the present invention, the refractive index N1 of the first lens is 1.6-1.65, and the Abbe number V1 is 60-60.5; the refractive index N2 of the second lens is 1.6-1.65, and the Abbe number V2 is 63-63.5; the refractive index N3 of the third lens is 1.65-1.7, and the Abbe number V3 is 55.5-56; the refractive index N4 of the fourth lens is 1.85-1.9, and the Abbe number V4 is 23.5-24.0; the refractive index N5 of the fifth lens is 1.7-1.75, and the Abbe number V5 is 54.5-55; the refractive index N6 of the sixth lens is 1.65-1.75, and the Abbe number V6 is 54.5-55. N6 is 1.85-1.9, and the Abbe number V6 is 23.5-24; the refractive index N7 of the seventh lens is 1.85-1.9, and the Abbe number V7 is 30-30.5; the refractive index N8 of the eighth lens is 1.6-1.65, and the Abbe number V8 is 63-63.5; the refractive index N9 of the ninth lens is 1.6-1.65, and the Abbe number is 63-63.5; the refractive index N10 of the tenth lens is 1.55-1.6, and the Abbe number V10 is 68-68.5; the refractive index N11 of the eleventh lens is 1.9-1.95, and the Abbe number V11 is 20.5-21.

[0047] As an improvement of the above-mentioned optical lens of the present disclosure, the effective focal length f of the optical lens is 6.5 mm to 9.5 mm, the aperture number Fno is F2.3, the half field angle is 35.6°, the image side target surface size IMG is 8.92 mm to 13.04 mm, the operating band is 400 nm to 700 nm, and the total optical length TTL of the system is 46.4 mm to 67.8 mm;

[0048] The effective focal length f of the optical lens and the image target surface size IMG of the optical lens satisfy 0.7<f / IMG<0.75.

[0049] As an improvement to the above-mentioned optical lens of the present disclosure, the field curvature value of the full field of view of the optical lens is less than 0.05 mm;

[0050] The distortion curve of the optical lens changes monotonically over the entire field of view;

[0051] The full-field MTF value of the optical lens has a contrast ratio of greater than 0.7 at a spatial frequency of 90 lp / mm;

[0052] The full-field MTF value of the optical lens has a contrast attenuation of zero at a spatial frequency of 600 lp / mm;

[0053] The full-field relative illumination of the optical lens is greater than 93%.

[0054] As an improvement of the above-mentioned optical lens of the present disclosure, within the range of -20°C to 60°C, the change in contrast of the full-field MTF value of the optical lens at a spatial frequency of 90 lp / mm is less than 0.05;

[0055] In the temperature range of -20°C to 60°C, the focus shift variation of the optical lens is less than 0.005mm.

[0056] As an improvement of the above-mentioned optical lens disclosed in the present invention, each lens of the optical lens is a glass lens, and each lens of the optical lens is a spherical lens.

[0057] A second aspect of the present disclosure provides an electronic device, which includes the optical lens described in the first aspect.

[0058] 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.

[0059] 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

[0060] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments of the present disclosure or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present disclosure. These drawings and text descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0061] Figure 1 A schematic structural diagram of an optical lens provided in an embodiment of the present disclosure;

[0062] Figure 2 A field curvature diagram of the optical lens provided in an embodiment of the present disclosure;

[0063] Figure 3 A distortion diagram of the optical lens provided in an embodiment of the present disclosure;

[0064] Figure 4 An MTF curve diagram of the optical lens provided in an embodiment of the present disclosure;

[0065] Figure 5 An MTF curve diagram of the optical lens provided by an embodiment of the present disclosure when the contrast is attenuated to 0;

[0066] Figure 6 A relative illumination curve diagram of the optical lens provided in an embodiment of the present disclosure;

[0067] Figure 7 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure when focusing at 20°C;

[0068] Figure 8 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure when focusing at -20°C;

[0069] Figure 9 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure when focusing at 60°C;

[0070] Figure 10 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure in a defocused state when focusing at 20°C;

[0071] Figure 11 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure in a defocused state when focusing at -20°C;

[0072] Figure 12 This is an MTF curve diagram of the optical lens provided by an embodiment of the present disclosure in the defocus state when focusing at 60°C. DETAILED DESCRIPTION

[0073] With the development of image processing and computer technology, machine vision technology has become increasingly widely used due to its advantages such as high precision, fast speed, and high stability. Lenses are an important component of machine vision technology, and the requirements for lenses are becoming increasingly higher.

[0074] Among them, the lens's field of view, resolution, uniformity of image plane illumination, and temperature drift characteristics directly affect detection accuracy.

[0075] In the fields of industrial inspection and machine vision, high-resolution lenses are a key component in overcoming bottlenecks in precision manufacturing quality control. Traditional lenses, due to their insufficient resolution, struggle to clearly capture micron-level defects or achieve sub-pixel dimensional measurements, leading to increased missed inspection rates for precision components and severely restricting the yield and efficiency of automated production. Therefore, high-resolution lenses, by improving image resolution and edge contrast, precisely adapt to high-pixel sensors, enabling high-precision and reliable inspection.

[0076] In 3D structured light detection, the illumination image of the projection module is typically bright in the center and dark at the edges. The final image brightness distribution is a function of both the illumination distribution and the relative illumination of the imaging lens. Therefore, a higher relative illumination of the lens results in a more consistent image brightness distribution, making it easier to capture the target object with a consistent exposure time, eliminating the need for HDR (High Dynamic Range) and other techniques. This significantly increases the capture speed of the 3D camera.

[0077] In complex industrial environments, lens thermal drift caused by temperature fluctuations severely restricts the stability and reliability of optical inspection systems. Traditional industrial lenses are susceptible to focus shift, image distortion, and MTF degradation in high-temperature production lines, extreme outdoor temperature swings, or continuous operation due to material thermal expansion coefficient mismatch and the thermal sensitivity of the optomechanical structure. These issues can lead to reduced inspection accuracy and increased false positives. Therefore, improving the thermal stability of lenses can effectively eliminate temperature interference with imaging resolution, geometric measurement accuracy, and long-term repeatability, ensuring that industrial vision systems maintain stability in demanding environments without the need for external temperature control.

[0078] Existing lenses cannot achieve high-definition imaging across a wide enough field of view. They also suffer from significant shortcomings, such as insufficient illumination at the edges of the field of view, resulting in low uniformity across the entire field of view. Furthermore, most lenses have poor temperature stability and are unable to achieve stable imaging without focus shift across the entire temperature range of -20°C to 60°C.

[0079] Some lenses may achieve these goals through complex optical systems and aspherical lenses. However, due to the high demands placed on 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.

[0080] In view of this, the embodiments of the present disclosure provide an optical lens that can improve the uniformity of relative illumination compared to lenses of the same focal length under the premise of wide field of view; and at the same time has the characteristics of high resolution and low temperature drift.

[0081] In addition, the lens uses a spherical glass material, which is relatively low in cost.

[0082] 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.

[0083] The embodiments of the present disclosure provide an optical lens that can achieve clear imaging within a sufficiently large field of view, and has high resolution, high uniformity, athermalization, and low cost.

[0084] Combine Figure 1 The optical lens of the embodiment of the present disclosure includes: a front lens group L1, a middle lens group L2 and a rear lens group L3 coaxially arranged in sequence from the object side to the image side.

[0085] The three lens groups can each be composed of at least one lens, which can be a double separated lens or a cemented lens. The lenses of the three lens groups can be spherical lenses, aspherical lenses, or a combination of spherical lenses and aspherical lenses.

[0086] 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.

[0087] The optical lens of the embodiment of the present disclosure has a half-field angle of 30° to 40°, an image target surface size IMG of the optical lens is 8mm to 14mm, an effective focal length f of the optical lens is 6mm to 10mm, and an aperture number Fno is F2.0 to F2.4.

[0088] Among them, the focal length fa of the front lens group L1 is -18mm to -8mm; the focal length fb of the middle lens group L2 is 13mm to 23mm; and the focal length fc of the rear lens group L3 is 13mm to 23mm.

[0089] The axial distance d12 between the front lens group L1 and the middle lens group L2 is 2 mm to 7 mm, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 9 mm to 14 mm. In this disclosure, the axial distance refers to the distance along the optical axis.

[0090] In some embodiments of the present disclosure, the effective focal length f of the optical lens is 6.5mm~9.5mm, the aperture number Fno is F2.3, the half field of view angle is 35.6°, the image side target surface size IMG is 8.92mm~13.04mm, the working band is 400nm~700nm, and the total optical length TTL of the system is 46.4mm~67.8mm.

[0091] The effective focal length f of the optical lens and the image side target surface size IMG of the optical lens satisfy 0.7<f / IMG<0.75.

[0092] Continue to refer to Figure 1 The optical lens of the embodiment of the present disclosure includes: 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 and an eleventh lens G11, which are coaxially arranged in sequence from the object side to the image side.

[0093] from Figure 1 It can be seen that under the premise of ensuring the optical path size and volume of the optical lens, the structure of the optical lens is simple and the machinability of each lens is good.

[0094] The first lens G1, the second lens G2 and the third lens G3 form a front lens group L1;

[0095] The fourth lens G4, the fifth lens G5, the sixth lens G6 and the seventh lens G7 form a middle lens group L2;

[0096] The eighth lens G8, the ninth lens G9, the tenth lens G10, and the eleventh lens G11 form a rear lens group L3;

[0097] The front lens group L1 has negative optical power; the middle lens group L2 and the rear lens group L3 have positive optical power respectively, forming a "negative-positive-positive" power distribution, effectively suppressing field curvature and distortion.

[0098] The axial distance d12 between front lens group L1 and middle lens group L2, and the axial distance d23 between middle lens group L2 and rear lens group L3 satisfy d23>d12. Thus, by compressing the axial distance d12 between front lens group L1 and middle lens group L2 and expanding the axial distance d23 between middle lens group L2 and rear lens group L3, optical space is reserved for thermal compensation of the rear lens group.

[0099] In some embodiments of the present disclosure, the focal length fa of the front lens group L1 and the effective focal length f of the optical lens satisfy 1.50<|fa / f|<1.51, the focal length fb of the middle lens group L2 and the effective focal length f of the optical lens satisfy 2.40<fb / f<2.45, and the focal length fc of the rear lens group L3 and the effective focal length f of the optical lens satisfy 2.30<fc / f<2.31;

[0100] The axial distance d12 between the front lens group L1 and the middle lens group L2 and the axial distance d23 between the middle lens group L2 and the rear lens group L3 satisfy 0.3<d12 / d23<0.4.

[0101] Each lens or lens group of the disclosed optical lens has its own unique functional focus, making the performance parameters more excellent. Each lens has a reasonable optical power distribution and material combination.

[0102] In the embodiment of the present disclosure, the first lens G1 has positive refractive power, which can converge off-axis light beams with a large angle while reducing the optical path aperture, thereby achieving miniaturization of the optical path structure.

[0103] The second lens G2 and the third lens G3 have negative optical power, which forms a positive and negative optical power combination with the positive optical power of the first lens G1, which can deflect the angle of the light as quickly as possible and reduce the angle between the light beam and the optical axis.

[0104] The fourth lens element G4 and the fifth lens element G5 are a cemented lens. The fourth lens element G4 has negative refractive power, while the fifth lens element G5 has positive refractive power. The fourth lens element G4 and the fifth lens element G5 form the first cemented lens group of the eleven optical lens elements. The difference in Abbe numbers between the fourth lens element G4 and the fifth lens element G5 is greater than 25, further eliminating chromatic aberration caused by the initial optical path.

[0105] The sixth lens element G6, the seventh lens element G7, the eighth lens element G8, and the ninth lens element G9 all have positive optical power. Through reasonable design and material selection, the positive optical power lenses minimize the negative impact of temperature changes on the optical system, thereby improving the reliability and imaging accuracy of the device in extreme environments.

[0106] An aperture stop ST is provided between the seventh lens G7 and the eighth lens G8. The incident surface of the eighth lens G8 facing the aperture stop ST is concave, which helps reduce the angle at which light rays enter the lens surface and correct system aberrations. The seventh lens G7 and the eighth lens G8 are two lenses on either side of the aperture stop ST. The difference in optical power between the seventh lens G7 and the eighth lens G8 is small, and the difference in focal length between the seventh lens G7 and the eighth lens G8 is small. For example, the difference in focal length between the seventh lens G7 and the eighth lens G8 is less than or equal to 0.2 mm, and the optical power is the inverse of the focal length. This effectively improves aberration correction, especially symmetrical aberrations. The angle of light rays incident on the aperture stop ST is symmetrical with the angle of exit, reducing light obstruction at large angles and improving the uniformity of illumination at the edge of the field of view. Lens groups with similar optical powers are less sensitive to assembly errors such as decentering and tilt, which helps improve the lens assembly yield. The combination of lenses with similar optical power can optimize the optical path folding, shorten the total optical length TTL, and meet the needs of lens miniaturization.

[0107] The tenth lens element, G10, and the eleventh lens element, G11, are cemented together, with the difference in Abbe number between the two lenses exceeding 45. Both lenses have negative refractive power. This effectively corrects chromatic aberration of the light beams converging on the image plane, ensuring that light of different wavelengths coincides with each other. The final two elements of the optical lens are double-cemented, correcting chromatic aberration and field curvature for large aperture systems, enhancing edge sharpness.

[0108] The present disclosure can effectively balance and process various aberrations through the above-mentioned lens combination structure, thereby improving the imaging performance and thermal stability of the optical system.

[0109] No vignetting is set during the design process of the optical lens disclosed in the present invention, so that as much peripheral field light as possible 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.

[0110] Each lens of the optical lens disclosed herein is a glass lens. Compared to plastic, glass has higher transmittance and better imaging effects. In addition, glass is much more physically and chemically stable than plastic, making it more adaptable to various environments and having a longer service life.

[0111] Each lens of the optical lens disclosed herein is a spherical lens. Glass spherical lenses are much cheaper than glass aspherical lenses.

[0112] Temperature drift of an optical lens refers to changes in optical performance caused by temperature variations. The main sources of temperature drift are thermal expansion and the thermo-optical coefficient (dn / dT). Thermal expansion is the physical dimensional change of the lens and lens due to temperature changes, which alters the lens spacing or curvature, and thus affects the focal length. The thermo-optical coefficient is the change in the refractive index of the lens material due to temperature changes, which directly affects the optical path and image quality.

[0113] In the embodiment of the present disclosure, the eleven lenses of the optical lens include at least two lens groups, and each lens group includes at least two lenses with the same refractive index and Abbe number.

[0114] For example, the refractive index and Abbe number of the second lens G2, the eighth lens G8, and the ninth lens G9 are respectively the same; the refractive index and Abbe number of the fourth lens G4 and the sixth lens G6 are respectively the same.

[0115] By setting lenses with the same refractive index, their refractive index changes in unison as the temperature changes. The Abbe number, a parameter that measures the chromatic aberration of a material, is the same. By setting the Abbe number to be the same, the dispersion characteristics are consistent, and the dispersion changes in sync with temperature changes, which helps reduce the deterioration of chromatic aberration caused by temperature changes.

[0116] Thermo-optic coefficient (dn / dT) is a physical quantity that describes the rate of change of an optical material's refractive index n with temperature T. Measured in Kelvin (or °C), it directly reflects the effect of temperature changes on the material's optical properties.

[0117] In the embodiment of the present disclosure, the first lens G1 has a positive thermo-optic coefficient, which weakens its positive optical power when the temperature rises, thereby offsetting the focus shift caused by the expansion of the lens barrel.

[0118] The second lens G2 has a positive thermo-optic coefficient, and the third lens G3 has a negative thermo-optic coefficient. The third lens G3 uses a material with a higher negative dn / dt value, which enhances the negative optical power when the temperature rises and actively induces the focus to move forward.

[0119] The fourth lens element G4 has a negative thermo-optic coefficient, and the fifth lens element G5 has a positive thermo-optic coefficient. Thus, the two lenses in the cemented lens have a negative thermo-optic coefficient and a positive thermo-optic coefficient, respectively, which cancel each other out.

[0120] The sixth lens G6 has a negative thermo-optic coefficient; the seventh lens G7 has a negative thermo-optic coefficient; the eighth lens G8 has a positive thermo-optic coefficient; and the ninth lens G9 has a positive thermo-optic coefficient.

[0121] The tenth lens G10 has a positive thermo-optic coefficient, which enhances its positive power at low temperatures to counteract material shrinkage. The eleventh lens G11 has a negative thermo-optic coefficient, which produces a strong negative power at high temperatures. The two lenses in the cemented lens have negative and positive thermo-optic coefficients, respectively, which compensate for each other. For example, the negative thermo-optic coefficient of the eleventh lens G11 is -15×10 -6 / ℃.

[0122] The first lens G1, the second lens G2, the eighth lens G8, and the ninth lens G9 all have the same refractive index. The fourth lens G4, the sixth lens G6, and the seventh lens G7 all have the same refractive index. By using lenses with the same refractive index, the refractive index of the lenses changes in a consistent manner with temperature fluctuations, helping to reduce temperature drift.

[0123] The Abbe number of the first lens G1 is smaller than that of the second lens G2, and the Abbe number of the third lens G3 is smaller than that of the second lens G2, forming a gradient in the thermal expansion coefficient of the material and starting a thermal drift compensation chain.

[0124] The center thickness of the second lens G2 is the same as the center thickness of the third lens G3 , and both are smaller than the center thickness of the first lens G1 , which helps to reduce thermal stress deformation.

[0125] The Abbe number of the fourth lens element G4 is smaller than that of the fifth lens element G5. The difference in the Abbe numbers of the two lenses in the cemented lens creates a high-low heat dissipation combination, which helps to eliminate axial chromatic aberration.

[0126] In the disclosed embodiment, 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 biconvex lens, the fifth lens G5 is a biconvex lens, the sixth lens G6 is a biconvex 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 biconvex lens, the tenth lens G10 is a biconvex lens, and the eleventh lens G11 is a convex-concave lens.

[0127] In the embodiment of the present disclosure, the curvature radius R11 of the incident surface of the first lens G1 is 29.0mm~42.5mm, and the curvature radius R12 of the exit surface is 110.9mm~162.2mm; the curvature radius R21 of the incident surface of the second lens G2 is 16.7mm~24.5mm, and the curvature radius R22 of the exit surface is 6.8mm~10.1mm; the curvature radius R31 of the incident surface of the third lens G3 is 25.0mm~36.7mm, and the curvature radius R3 2 is 7.1mm to 10.5mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -14.1mm to -9.6mm, and the curvature radius R42 of the exit surface is 12.4mm to 18.2mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 12.4mm to 18.2mm, and the curvature radius R52 of the exit surface is -21.7mm to -14.8mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 51.6mm to 75.5mm, and the curvature radius R62 of the exit surface is 51.6mm to 75.5mm. The curvature radius R62 of the incident surface of the seventh lens G7 is -29.3mm to -23.7mm; the curvature radius R71 of the incident surface of the seventh lens G7 is 25.6mm to 37.5mm, and the curvature radius R72 of the exit surface is 258.2mm to 377.5mm; the curvature radius R81 of the incident surface of the eighth lens G8 is -376.2mm to -257.3mm, and the curvature radius R82 of the exit surface is -28.2mm to -19.2mm; the curvature radius R91 of the incident surface of the ninth lens G9 is The angle of curvature of the incident surface of the tenth lens G10 is 40.1mm~58.8mm, and the radius of curvature R92 of the exit surface is -48.3mm~-33.0mm; the radius of curvature R101 of the incident surface of the tenth lens G10 is 26.8mm~39.2mm, and the radius of curvature R102 of the exit surface is -12.0mm~-8.1mm; the radius of curvature R111 of the incident surface of the eleventh lens G11 is -12.0mm~-8.1mm, and the radius of curvature R112 of the exit surface is -68.9mm~-47.1mm.

[0128] Combine Figure 1 The incident surface of the lens is the surface facing the object side; the exit surface of the lens is the surface facing the image side.

[0129] In the embodiment of the present disclosure, the curvature radius R41 of the incident surface of the fourth lens G4 and the curvature radius R52 of the exit surface of the fifth lens G5 satisfy 0.4<R41 / R52<1.0;

[0130] A curvature radius R101 of the incident surface of the tenth lens G10 and a curvature radius R112 of the exit surface of the eleventh lens G11 satisfy 0.3<|R101 / R112|<0.9.

[0131] In the disclosed embodiment, the center thickness GT1 of the first lens G1 is 3.3 mm to 4.9 mm; the center thickness GT2 of the second lens G2 is 0.9 mm to 1.5 mm; the center thickness GT3 of the third lens G3 is 0.9 mm to 1.5 mm; the center thickness GT4 of the fourth lens G4 is 0.9 mm to 1.4 mm; the center thickness GT5 of the fifth lens G5 is 3.6 mm to 5.3 mm; the center thickness GT6 of the sixth lens G6 is 2.6 mm to 3.8 mm; the center thickness GT7 of the seventh lens G7 is 1.9 mm to 2.8 mm; the center thickness GT8 of the eighth lens G8 is 1.5 mm to 2.3 mm; the center thickness GT9 of the ninth lens G9 is 1.5 mm to 2.4 mm; the center thickness GT10 of the tenth lens G10 is 2.4 mm to 3.6 mm; and the center thickness GT11 of the eleventh lens G11 is 0.8 mm to 1.2 mm. The center thickness of a lens refers to the thickness of the center of the lens along the optical axis.

[0132] In the embodiment of the present disclosure, the center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.16<GT4 / GT5<0.4;

[0133] The center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.0<GT10 / GT11<4.5.

[0134] In the embodiment of the present disclosure, the air distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.07 mm to 0.11 mm; the air distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 3.40 mm to 5.00 mm; the air distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 3.59 mm to 5.26 mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air distance AT4 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.07 mm to 0.10 mm; the air distance AT5 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.11 mm to 0.18 mm. mm; the air distance AT6 along the optical axis between the seventh lens G7 and the aperture stop ST is 6.57 mm to 9.61 mm; the air distance AT7 along the optical axis between the aperture stop ST and the eighth lens G8 is 2.74 mm to 4.02 mm; the air distance AT8 along the optical axis between the eighth lens G8 and the ninth lens G9 is 0.07 mm to 0.12 mm; the air distance AT9 along the optical axis between the ninth lens G9 and the tenth lens G10 is 0.07 mm to 0.11 mm; the tenth lens G10 and the eleventh lens G11 are a cemented lens; and the air distance BFL along the optical axis between the eleventh lens G11 and the image plane is 9.05 mm to 13.24 mm.

[0135] In the embodiment of the present disclosure, an air distance AT6 between the seventh lens G7 and the aperture stop ST along the optical axis and an air distance AT7 between the aperture stop ST and the eighth lens G8 along the optical axis satisfy 9.3<AT6+AT7<13.7;

[0136] An air distance BFL between the eleventh lens G11 and the image plane along the optical axis and a total optical length TTL of the system satisfy 0.13<BFL / TTL<0.3.

[0137] In the disclosed embodiment, the focal length f1 of the first lens G1 is 62.7 mm to 91.6 mm; the focal length f2 of the second lens G2 is -28.6 mm to -19.6 mm; the focal length f3 of the third lens G3 is -22.1 mm to -15.1 mm; the focal length f4 of the fourth lens G4 is -15.0 mm to -10.3 mm; the focal length f5 of the fifth lens G5 is 24.5 mm to 35.8 mm; the focal length f6 of the sixth lens G6 is 24.5 mm to 35.8 mm; The focal length f6 of the seventh lens element G7 is 19.7 mm to 28.8 mm; the focal length f7 of the eighth lens element G8 is 33.6 mm to 49.1 mm; the focal length f8 of the eighth lens element G8 is 33.7 mm to 49.3 mm; the focal length f9 of the ninth lens element G9 is 18.1 mm to 26.4 mm; the focal length f10 of the tenth lens G10 is -90.7 mm to -62.0 mm; and the focal length f11 of the eleventh lens G11 is -73.9 mm to -50.6 mm.

[0138] In the embodiment of the present disclosure, the focal length f1 of the first lens G1 satisfies 6.6<f1 / f<14.1 with the effective focal length f of the optical lens; the focal length f2 of the second lens G2 satisfies 2.0<|f2 / f|<4.4 with the effective focal length f of the optical lens; the focal length f3 of the third lens G3 satisfies 1.5<|f3 / f|<3.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens G4 satisfies 1.0<|f4 / f|<2.4 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens G5 satisfies 2.5<f5 / f<5.6 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens G6 satisfies the effective focal length f of the optical lens satisfies 2.0<f6 / f<4.5; the focal length f7 of the seventh lens G7 and the effective focal length f of the optical lens satisfy 3.5<f7 / f<7.6; the focal length f8 of the eighth lens G8 and the effective focal length f of the optical lens satisfy 3.5<f8 / f<7.6; the focal length f9 of the ninth lens G9 and the effective focal length f of the optical lens satisfy 1.9<f9 / f<4.1; the focal length f10 of the tenth lens G10 and the effective focal length f of the optical lens satisfy 6.5<|f10 / f|<1.4; the focal length f11 of the eleventh lens G11 and the effective focal length f of the optical lens satisfy 5.3<f11 / f<11.4.

[0139] In the disclosed embodiment, the refractive index N1 of the first lens element G1 is 1.6 to 1.65, and the Abbe number V1 is 60 to 60.5; the refractive index N2 of the second lens element G2 is 1.6 to 1.65, and the Abbe number V2 is 63 to 63.5; the refractive index N3 of the third lens element G3 is 1.65 to 1.7, and the Abbe number V3 is 55.5 to 56; the refractive index N4 of the fourth lens element G4 is 1.85 to 1.9, and the Abbe number V4 is 23.5 to 24.0; the refractive index N5 of the fifth lens element G5 is 1.7 to 1.75, and the Abbe number V5 is 54.5 to 55; the refractive index N6 of the sixth lens element G6 is 1. The refractive index N7 of the seventh lens element G7 is 1.85-1.9, and the Abbe number V7 is 30-30.5; the refractive index N8 of the eighth lens element G8 is 1.6-1.65, and the Abbe number V8 is 63-63.5; the refractive index N9 of the ninth lens element G9 is 1.6-1.65, and the Abbe number is 63-63.5; the refractive index N10 of the tenth lens element G10 is 1.55-1.6, and the Abbe number V10 is 68-68.5; the refractive index N11 of the eleventh lens G11 is 1.9-1.95, and the Abbe number V11 is 20.5-21.

[0140] The shape, processing tolerance and assembly tolerance of each lens of the optical lens disclosed in the present invention are reasonable, which effectively improves the production yield.

[0141] The present disclosure provides a wide-angle, athermal, fixed-focus lens that, through a three-group, eleven-lens architecture coupled with precise optical parameter coupling, simultaneously achieves a large aperture, a large field of view, high uniformity, high resolution, and ultra-high temperature stability in a compact system overall length.

[0142] Among them, the first lens G1, the second lens G2 and the third lens G3 in the front lens group L1 are all full concave-convex lenses, forming a "negative-positive-positive" optical power distribution, which can suppress field curvature and distortion.

[0143] In the embodiment of the present disclosure, eleven lenses are made of eight optical materials, which limits the types of lens materials and helps improve thermal stability and mass production consistency.

[0144] The first lens element, G1, is a convex-concave positive lens with weak positive power. As a wide-angle entrance portal, its large radius of curvature mitigates wide-angle light deflection and suppresses wide-angle distortion. The first lens element, G1, is constructed of a material with a high Abbe number (V1), for example, 60.3, which reduces the effects of chromatic aberration on the periphery of the field of view.

[0145] The second lens G2 and the third lens G3 both have strong negative optical power and constitute the core of field curvature correction, offsetting the warping of the wide-angle image plane of the front group through reverse curvature.

[0146] In some embodiments, the radius of curvature R41 of the incident surface of the fourth lens element G4 and the radius of curvature R52 of the exit surface of the fifth lens element G5 satisfy 0.6 < R41 / R52 < 0.7; and the center thickness GT4 of the fourth lens element G4 and the center thickness GT5 of the fifth lens element G5 satisfy 0.2 < GT4 / GT5 < 0.3. This higher dispersion of the fourth lens element G4 than that of the fifth lens element G5 facilitates elimination of axial chromatic aberration. For example, the refractive index N4 of the fourth lens element G4 is 1.85, and the Abbe number V4 is 23.8; the refractive index N5 of the fifth lens element G5 is 1.73, and the Abbe number V5 is 54.7.

[0147] The sixth lens element G6 is a biconvex positive lens with core positive power. The refractive index of the sixth lens element G6 is relatively high, for example, 1.85, which can compress the light deflection angle and reduce the sensitivity to spherical aberration.

[0148] The seventh lens G7 is a convex-concave positive lens with a large curvature on its exit surface, which can smoothly converge light. In conjunction with the spacing of the aperture stop ST, it constrains and locks the angle of the main optical fiber and suppresses temperature-induced image plane shift.

[0149] The eighth lens element G8 is a meniscus negative lens that can compensate for off-axis aberrations and forms a negative-positive lens pair with the ninth lens element G9 to offset marginal field dispersion.

[0150] The aperture stop ST is disposed between the seventh lens element G7 and the eighth lens element G8 to construct a nearly symmetrical optical path, thereby self-balancing the front and rear focal length changes when the temperature changes.

[0151] The ninth lens element, G9, is a biconvex positive lens with strong positive power, which helps improve relative illumination at the edge. It is made of a low-dispersion material. For example, its Abbe number V9 is 63.4, which helps balance the chromatic aberration of the eighth lens element, G8.

[0152] The tenth lens G10 and the eleventh lens G11 form a cemented lens in the second group. The tenth lens G10 is a biconvex lens, and the tenth lens G11 is a meniscus lens. By utilizing the curvature ratio and thickness ratio, and combining the refractive index and Abbe number of the materials, lateral chromatic aberration can be suppressed.

[0153] Combine Figure 2 In the field curvature diagram, the ordinate is 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.

[0154] Combine Figure 3 The vertical axis is the field of view, and the horizontal axis is the distortion value. Each curve represents the distortion value at different wavelengths within the working band.

[0155] In the present disclosure, the field curvature value of the optical lens in the full field of view is less than 0.05mm; the distortion curve of the optical lens changes monotonically in the full field of view; it can ensure that the entire imaging picture has less distortion, which is convenient for algorithm correction and thus ensures the imaging effect.

[0156] Combine Figure 4 and Figure 5 The MTF (Modulation Transfer Function) curve shows spatial frequency on the horizontal axis in line periods per millimeter (also called line pairs per millimeter, lp / mm). The vertical axis shows contrast, ranging from 0 to 1. The solid and dashed lines represent the meridional and sagittal components of the MTF for 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 are and the closer they are, the better the image quality.

[0157] Combine Figure 4 The full-field MTF value of the optical lens of the embodiment of the present disclosure has a contrast ratio greater than 0.7 at a spatial frequency of 90lp / mm, and the full-field MTF curve is close to the diffraction limit curve. Figure 4In the figure, the black line is the diffraction-limited curve, which represents the theoretical maximum value of contrast as a function of spatial frequency in an ideal, aberration-free optical system. The MTF curve of any actual lens cannot exceed this curve; it can only approximate it.

[0158] The diffraction limit curve in the MTF curve represents the physical ceiling of the optical system's resolution, determined by wavelength and aperture. A design that closely adheres to the diffraction limit indicates near-perfect lens aberration correction and excellent overall performance. As a result, the lens of the disclosed embodiments achieves extremely high resolution and can be used with ultra-high-pixel chips.

[0159] Combine Figure 5 , the full-field MTF value of the optical lens of the embodiment of the present disclosure has a contrast attenuation of zero at a spatial frequency of 600lp / mm.

[0160] Combine Figure 6 The horizontal axis of the illumination curve is the field of view, in degrees. 0° represents the center field of view, and 35.6° represents the edge field of view. The vertical axis represents the relative illumination, with a value range of 0 to 1. The full-field relative illumination of the optical lens disclosed herein is greater than 93%. The high relative illumination ensures uniformity across the entire image, with no dark corners even at the edges of the image, and very little difference in brightness between the edges and the center.

[0161] Figure 7 、 Figure 8 、 Figure 9 The following are MTF (Modulation Transfer Function) curves of the optical lens according to the embodiment of the present disclosure when focusing at 20°C, -20°C and 60°C respectively.

[0162] In the range of -20°C to 60°C, the contrast change of the full-field MTF value of the optical lens at a spatial frequency of 90lp / mm is less than 0.05, indicating that the optical lens of the embodiment of the present disclosure has a low temperature drift characteristic.

[0163] Figure 10 、 Figure 11 as well as Figure 12 The following graphs show the MTF (Modulation Transfer Function) curves for an embodiment of the present disclosure at 20°C, -20°C, and 60°C defocus conditions. In this graph, the horizontal axis represents the focal shift (abbreviated as focal shift) in millimeters, while 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.

[0164] Combine Figure 10After focusing at 20°C, the modulation transfer function of each field of view in the defocus state has the maximum contrast when the focus shift is 0; and the contrast is greater than 0.7 at 90 line pairs / mm.

[0165] In the range of -20℃ to 60℃, the focus offset change of the optical lens is less than 0.005mm, indicating that the optical lens disclosed in the present invention has good temperature stability and is suitable for high-precision imaging requirements under harsh temperature conditions.

[0166] Through the above description of the characteristics of the optical lens of the present invention, the optical lens of the embodiment of the present invention is a wide-angle industrial lens with high resolution, high uniformity, extremely high mass production and extremely low cost. At the same time, compared with the current industrial lenses, the athermal characteristics are further improved.

[0167] Three specific examples of optical lenses are introduced below.

[0168] Example 1

[0169] In the example disclosed herein, the effective focal length f of the optical lens is 6.5 mm, the aperture number Fno is F / 2.3, the half field of view angle is 35.6°, the image side target surface size IMG is 8.92 mm, the working band is 400 nm to 700 nm, and the total optical length TTL of the system is 46.4 mm.

[0170] The focal length fa of front lens group L1 is -9.78mm, the focal length fb of middle lens group L2 is 14.84mm, and the focal length fc of rear lens group L3 is 14.97mm. The axial distance d12 between front lens group L1 and middle lens group L2 is 3.6mm, and the axial distance d23 between middle lens group L2 and rear lens group L3 is 9.3mm.

[0171] The curvature radius of each lens is as follows: the curvature radius R11 of the incident surface of the first lens G1 is 29.03mm, and the curvature radius R12 of the exit surface is 110.93mm; the curvature radius R21 of the incident surface of the second lens G2 is 16.71mm, and the curvature radius R22 of the exit surface is 6.85mm; the curvature radius R31 of the incident surface of the third lens G3 is 25.07mm, and the curvature radius R32 of the exit surface is 7.13mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -9.60mm, and the curvature radius R42 of the exit surface is 12.43mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 12.43mm, and the curvature radius R52 of the exit surface is -14.84mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 51.64mm. The radius of curvature of the incident surface of the seventh lens G7 is R71, which is 25.60 mm, and the radius of curvature of the exit surface is R72, which is 258.26 mm. The radius of curvature of the incident surface of the eighth lens G8 is R81, which is -257.34 mm, and the radius of curvature of the exit surface is R82, which is -19.24 mm. The radius of curvature of the incident surface of the ninth lens G9 is R91, which is 40.17 mm, and the radius of curvature of the exit surface is R92, which is -33.03 mm. The radius of curvature of the incident surface of the tenth lens G10 is R101, which is 26.80 mm, and the radius of curvature of the exit surface is R102, which is -8.16 mm. The radius of curvature of the incident surface of the eleventh lens G11 is R111, which is -8.16 mm, and the radius of curvature of the exit surface is R112, which is -47.11 mm.

[0172] A curvature radius R41 of the incident surface of the fourth lens G4 and a curvature radius R52 of the exit surface of the fifth lens G5 satisfy 0.6<R41 / R52<0.7;

[0173] A curvature radius R101 of the incident surface of the tenth lens G10 and a curvature radius R112 of the exit surface of the eleventh lens G11 satisfy 0.5<|R101 / R112|<0.6.

[0174] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 3.32 mm; the center thickness GT2 of the second lens G2 is 0.97 mm; the center thickness GT3 of the third lens G3 is 0.97 mm; the center thickness GT4 of the fourth lens G4 is 0.96 mm; the center thickness GT5 of the fifth lens G5 is 3.61 mm; the center thickness GT6 of the sixth lens G6 is 2.60 mm; the center thickness GT7 of the seventh lens G7 is 1.90 mm; the center thickness GT8 of the eighth lens G8 is 1.52 mm; the center thickness GT9 of the ninth lens G9 is 1.59 mm; the center thickness GT10 of the tenth lens G10 is 2.42 mm; and the center thickness GT11 of the eleventh lens G11 is 0.81 mm.

[0175] The center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2<GT4 / GT5<0.3;

[0176] The center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.9<GT10 / GT11<3.0.

[0177] 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 0.07mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 3.40mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 3.59mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air spacing distance AT4 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.07; the air spacing distance AT5 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0. .11; the air distance AT6 along the optical axis between the seventh lens G7 and the aperture stop ST is 6.57 mm; the air distance AT7 along the optical axis between the aperture stop ST and the eighth lens G8 is 2.74 mm; the air distance AT8 along the optical axis between the eighth lens G8 and the ninth lens G9 is 0.07 mm; the air distance AT9 along the optical axis between the ninth lens G9 and the tenth lens G10 is 0.07 mm; the tenth lens G10 and the eleventh lens G11 are a cemented lens; and the air distance BFL along the optical axis between the eleventh lens G11 and the image plane is 9.05 mm.

[0178] An air distance AT6 between the seventh lens G7 and the aperture stop ST along the optical axis and an air distance AT7 between the aperture stop ST and the eighth lens G8 along the optical axis satisfy 9.3<AT6+AT7<9.4.

[0179] An air distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.19<BFL / TTL<0.20 with respect to the total optical length TTL of the system.

[0180] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 62.7 mm; the focal length f2 of the second lens G2 is -19.6 mm; the focal length f3 of the third lens G3 is -15.1 mm; the focal length f4 of the fourth lens G4 is -10.3 mm; the focal length f5 of the fifth lens G5 is 24.5 mm; the focal length f6 of the sixth lens G6 is 19.7 mm; the focal length f7 of the seventh lens G7 is 33.6 mm; the focal length f8 of the eighth lens G8 is 33.7 mm; the focal length f9 of the ninth lens G9 is 18.1 mm; the focal length f10 of the tenth lens G10 is -62.0 mm; and the focal length f11 of the eleventh lens G11 is -50.6 mm.

[0181] The focal length f1 of the first lens G1 satisfies 9.6<f1 / f<9.7 with the effective focal length f of the optical lens; the focal length f2 of the second lens G2 satisfies 3.0<|f2 / f|<3.1 with the effective focal length f of the optical lens; the focal length f3 of the third lens G3 satisfies 2.3<|f3 / f|<2.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens G4 satisfies 1.5<|f4 / f|<1.6 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens G5 satisfies 3.7<f5 / f<3.8 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens G6 satisfies f satisfies 3.0<f6 / f<3.1; the focal length f7 of the seventh lens G7 and the effective focal length f of the optical lens satisfy 5.1<f7 / f<5.2; the focal length f8 of the eighth lens G8 and the effective focal length f of the optical lens satisfy 5.1<f8 / f<5.2; the focal length f9 of the ninth lens G9 and the effective focal length f of the optical lens satisfy 2.7<f9 / f<2.8; the focal length f10 of the tenth lens G10 and the effective focal length f of the optical lens satisfy 9.5<|f10 / f|<9.6; the focal length f11 of the eleventh lens G11 and the effective focal length f of the optical lens satisfy 7.7<f11 / f<7.8.

[0182] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.62, and the Abbe number V1 is 60.3; the refractive index N2 of the second lens G2 is 1.62, and the Abbe number V2 is 63.4; the refractive index N3 of the third lens G3 is 1.68, and the Abbe number V3 is 55.5; the refractive index N4 of the fourth lens G4 is 1.85, and the Abbe number V4 is 23.8; the refractive index N5 of the fifth lens G5 is 1.73, and the Abbe number V5 is 54.7; the refractive index of the sixth lens G6 is 1.68, and the Abbe number V3 is 55.5; The refractive index N6 of the seventh lens element G7 is 1.85, and the Abbe number V6 is 23.8; the refractive index N7 of the seventh lens element G7 is 1.85, and the Abbe number V7 is 30.1; the refractive index N8 of the eighth lens element G8 is 1.62, and the Abbe number V8 is 63.4; the refractive index N9 of the ninth lens element G9 is 1.62, and the Abbe number V10 is 63.4; the refractive index N10 of the tenth lens element G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index N11 of the eleventh lens G11 is 1.92, and the Abbe number V11 is 20.9.

[0183] Example 2

[0184] In the example disclosed herein, the effective focal length f of the optical lens is 8 mm, the aperture number Fno is F / 2.3, the half field of view angle is 35.6°, the image side target surface size IMG is 10.98 mm, the working band is 400 nm to 700 nm, and the total optical length TTL of the system is 57.1 mm.

[0185] The focal length fa of front lens group L1 is -12.04mm, the focal length fb of middle lens group L2 is 18.26mm, and the focal length fc of rear lens group L3 is 18.43mm. The axial distance d12 between front lens group L1 and middle lens group L2 is 4.4mm, and the axial distance d23 between middle lens group L2 and rear lens group L3 is 11.5mm.

[0186] The curvature radius of each lens is as follows: the curvature radius R11 of the incident surface of the first lens G1 is 35.73mm, and the curvature radius R12 of the exit surface is 136.53mm; the curvature radius R21 of the incident surface of the second lens G2 is 20.57mm, and the curvature radius R22 of the exit surface is 8.43mm; the curvature radius R31 of the incident surface of the third lens G3 is 30.85mm, and the curvature radius R32 of the exit surface is 8.77mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -11.81mm, and the curvature radius R42 of the exit surface is 15.30mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 15.30mm, and the curvature radius R52 of the exit surface is -18.26mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 63.56m m, and the radius of curvature R62 of the exit surface is -29.22mm; the radius of curvature R71 of the incident surface of the seventh lens element G7 is 31.51mm, and the radius of curvature R72 of the exit surface is 317.86mm; the radius of curvature R81 of the incident surface of the eighth lens element G8 is -316.73mm, and the radius of curvature R82 of the exit surface is -23.68mm; the radius of curvature R91 of the incident surface of the ninth lens element G9 is 49.44mm, and the radius of curvature R92 of the exit surface is -40.66mm; the radius of curvature R101 of the incident surface of the tenth lens G10 is 32.99mm, and the radius of curvature R102 of the exit surface is -10.04mm; the radius of curvature R111 of the incident surface of the eleventh lens G11 is -10.04mm, and the radius of curvature R112 of the exit surface is -57.98mm.

[0187] A curvature radius R41 of the incident surface of the fourth lens G4 and a curvature radius R52 of the exit surface of the fifth lens G5 satisfy 0.6<R41 / R52<0.7;

[0188] A curvature radius R101 of the incident surface of the tenth lens G10 and a curvature radius R112 of the exit surface of the eleventh lens G11 satisfy 0.5<|R101 / R112|<0.6.

[0189] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 4.08 mm; the center thickness GT2 of the second lens G2 is 1.19 mm; the center thickness GT3 of the third lens G3 is 1.20 mm; the center thickness GT4 of the fourth lens G4 is 1.18 mm; the center thickness GT5 of the fifth lens G5 is 4.44 mm; the center thickness GT6 of the sixth lens G6 is 3.19 mm; the center thickness GT7 of the seventh lens G7 is 2.34 mm; the center thickness GT8 of the eighth lens G8 is 1.87 mm; the center thickness GT9 of the ninth lens G9 is 1.96 mm; the center thickness GT10 of the tenth lens G10 is 2.98 mm; and the center thickness GT11 of the eleventh lens G11 is 1.00 mm.

[0190] The center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2<GT4 / GT5<0.3;

[0191] The center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.9<GT10 / GT11<3.0.

[0192] 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 0.08mm; the air spacing distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 4.18mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 4.42mm; the fourth lens G4 and the fifth lens G5 are a cemented lens; the air spacing distance AT4 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.09; and the air spacing distance AT5 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0. 14; the air distance AT6 along the optical axis between the seventh lens G7 and the aperture stop ST is 8.09 mm; the air distance AT7 along the optical axis between the aperture stop ST and the eighth lens G8 is 3.37 mm; the air distance AT8 along the optical axis between the eighth lens G8 and the ninth lens G9 is 0.09 mm; the air distance AT9 along the optical axis between the ninth lens G9 and the tenth lens G10 is 0.08 mm; the tenth lens G10 and the eleventh lens G11 are a cemented lens; and the air distance BFL along the optical axis between the eleventh lens G11 and the image plane is 11.14 mm.

[0193] An air distance AT6 between the seventh lens G7 and the aperture stop ST along the optical axis and an air distance AT7 between the aperture stop ST and the eighth lens G8 along the optical axis satisfy 11.4<AT6+AT7<11.5.

[0194] An air distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.19<BFL / TTL<0.20 with respect to the total optical length TTL of the system.

[0195] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 77.1 mm; the focal length f2 of the second lens G2 is -24.1 mm; the focal length f3 of the third lens G3 is -18.6 mm; the focal length f4 of the fourth lens G4 is -12.7 mm; the focal length f5 of the fifth lens G5 is 30.2 mm; the focal length f6 of the sixth lens G6 is 24.3 mm; the focal length f7 of the seventh lens G7 is 41.3 mm; the focal length f8 of the eighth lens G8 is 41.5 mm; the focal length f9 of the ninth lens G9 is 22.2 mm; the focal length f10 of the tenth lens G10 is -76.3 mm; and the focal length f11 of the eleventh lens G11 is -62.2 mm.

[0196] The focal length f1 of the first lens G1 satisfies 9.6<f1 / f<9.7 with the effective focal length f of the optical lens; the focal length f2 of the second lens G2 satisfies 3.0<|f2 / f|<3.1 with the effective focal length f of the optical lens; the focal length f3 of the third lens G3 satisfies 2.3<|f3 / f|<2.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens G4 satisfies 1.5<|f4 / f|<1.6 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens G5 satisfies 3.7<f5 / f<3.8 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens G6 satisfies f satisfies 3.0<f6 / f<3.1; the focal length f7 of the seventh lens G7 and the effective focal length f of the optical lens satisfy 5.1<f7 / f<5.2; the focal length f8 of the eighth lens G8 and the effective focal length f of the optical lens satisfy 5.1<f8 / f<5.2; the focal length f9 of the ninth lens G9 and the effective focal length f of the optical lens satisfy 2.7<f9 / f<2.8; the focal length f10 of the tenth lens G10 and the effective focal length f of the optical lens satisfy 9.5<|f10 / f|<9.6; the focal length f11 of the eleventh lens G11 and the effective focal length f of the optical lens satisfy 7.7<f11 / f<7.8.

[0197] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.62, and the Abbe number V1 is 60.3; the refractive index N2 of the second lens G2 is 1.62, and the Abbe number V2 is 63.4; the refractive index N3 of the third lens G3 is 1.68, and the Abbe number V3 is 55.5; the refractive index N4 of the fourth lens G4 is 1.85, and the Abbe number V4 is 23.8; the refractive index N5 of the fifth lens G5 is 1.73, and the Abbe number V5 is 54.7; the refractive index of the sixth lens G6 is 1.68, and the Abbe number V3 is 55.5; The refractive index N6 of the seventh lens element G7 is 1.85, and the Abbe number V6 is 23.8; the refractive index N7 of the seventh lens element G7 is 1.85, and the Abbe number V7 is 30.1; the refractive index N8 of the eighth lens element G8 is 1.62, and the Abbe number V8 is 63.4; the refractive index N9 of the ninth lens element G9 is 1.62, and the Abbe number V10 is 63.4; the refractive index N10 of the tenth lens element G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index N11 of the eleventh lens G11 is 1.92, and the Abbe number V11 is 20.9.

[0198] Example 3

[0199] In the example disclosed herein, the effective focal length f of the optical lens is 9.5 mm, the aperture number Fno is F / 2.3, the half field of view angle is 35.6°, the image side target surface size IMG is 13.04 mm, the working band is 400 nm to 700 nm, and the total optical length TTL of the system is 67.8 mm.

[0200] The focal length fa of front lens group L1 is -14.30mm, the focal length fb of middle lens group L2 is 21.69mm, and the focal length fc of rear lens group L3 is 21.88mm. The axial distance d12 between front lens group L1 and middle lens group L2 is 5.25mm, and the axial distance d23 between middle lens group L2 and rear lens group L3 is 13.61mm.

[0201] The curvature radius of each lens is as follows: the curvature radius R11 of the incident surface of the first lens G1 is 42.43mm, and the curvature radius R12 of the exit surface is 162.13mm; the curvature radius R21 of the incident surface of the second lens G2 is 24.42mm, and the curvature radius R22 of the exit surface is 10.01mm; the curvature radius R31 of the incident surface of the third lens G3 is 36.64mm, and the curvature radius R32 of the exit surface is 10.42mm; the curvature radius R41 of the incident surface of the fourth lens G4 is -14.03mm, and the curvature radius R42 of the exit surface is 18.16mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 18.16mm, and the curvature radius R52 of the exit surface is -21.68mm; the curvature radius R61 of the incident surface of the sixth lens G6 is 75.48mm. The radius of curvature of the incident surface of the seventh lens G7 is R71, which is 37.42 mm, and the radius of curvature of the exit surface is R72, which is 377.46 mm. The radius of curvature of the incident surface of the eighth lens G8 is R81, which is -376.12 mm, and the radius of curvature of the exit surface is R82, which is -28.12 mm. The radius of curvature of the incident surface of the ninth lens G9 is R91, which is 58.71 mm, and the radius of curvature of the exit surface is R92, which is -48.28 mm. The radius of curvature of the incident surface of the tenth lens G10 is R101, which is 39.17 mm, and the radius of curvature of the exit surface is R102, which is -11.93 mm. The radius of curvature of the incident surface of the eleventh lens G11 is R111, which is -11.93 mm, and the radius of curvature of the exit surface is R112, which is -68.85 mm.

[0202] A curvature radius R41 of the incident surface of the fourth lens G4 and a curvature radius R52 of the exit surface of the fifth lens G5 satisfy 0.6<R41 / R52<0.7;

[0203] A curvature radius R101 of the incident surface of the tenth lens G10 and a curvature radius R112 of the exit surface of the eleventh lens G11 satisfy 0.5<|R101 / R112|<0.6.

[0204] The center thicknesses of the lenses are as follows: the center thickness GT1 of the first lens G1 is 4.85 mm; the center thickness GT2 of the second lens G2 is 1.41 mm; the center thickness GT3 of the third lens G3 is 1.42 mm; the center thickness GT4 of the fourth lens G4 is 1.40 mm; the center thickness GT5 of the fifth lens G5 is 5.28 mm; the center thickness GT6 of the sixth lens G6 is 3.79 mm; the center thickness GT7 of the seventh lens G7 is 2.77 mm; the center thickness GT8 of the eighth lens G8 is 2.22 mm; the center thickness GT9 of the ninth lens G9 is 2.32 mm; the center thickness GT10 of the tenth lens G10 is 3.53 mm; and the center thickness GT11 of the eleventh lens G11 is 1.19 mm.

[0205] The center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2<GT4 / GT5<0.3;

[0206] The center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.9<GT10 / GT11<3.0.

[0207] 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 4.97 mm; the air spacing distance AT3 between the third lens G3 and the fourth lens G4 along the optical axis is 5.25 mm; the fourth lens G4 and the fifth lens G5 are a cemented lens; the air spacing distance AT4 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.11 mm; and the air spacing distance AT5 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0. 17; the air distance AT6 along the optical axis between the seventh lens G7 and the aperture stop ST is 9.60 mm; the air distance AT7 along the optical axis between the aperture stop ST and the eighth lens G8 is 4.01 mm; the air distance AT8 along the optical axis between the eighth lens G8 and the ninth lens G9 is 0.11 mm; the air distance AT9 along the optical axis between the ninth lens G9 and the tenth lens G10 is 0.10 mm; the tenth lens G10 and the eleventh lens G11 are a cemented lens; and the air distance BFL along the optical axis between the eleventh lens G11 and the image plane is 13.23 mm.

[0208] An air distance AT6 between the seventh lens G7 and the aperture stop ST along the optical axis and an air distance AT7 between the aperture stop ST and the eighth lens G8 along the optical axis satisfy 13.55<AT6+AT7<13.65.

[0209] An air distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.19<BFL / TTL<0.20 with respect to the total optical length TTL of the system.

[0210] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 91.6 mm; the focal length f2 of the second lens G2 is -28.6 mm; the focal length f3 of the third lens G3 is -22.1 mm; the focal length f4 of the fourth lens G4 is -15.0 mm; the focal length f5 of the fifth lens G5 is 35.8 mm; the focal length f6 of the sixth lens G6 is 28.8 mm; the focal length f7 of the seventh lens G7 is 49.1 mm; the focal length f8 of the eighth lens G8 is 49.3 mm; the focal length f9 of the ninth lens G9 is 26.4 mm; the focal length f10 of the tenth lens G10 is -90.7 mm; and the focal length f11 of the eleventh lens G11 is -73.9 mm.

[0211] The focal length f1 of the first lens G1 satisfies 9.6<f1 / f<9.7 with the effective focal length f of the optical lens; the focal length f2 of the second lens G2 satisfies 3.0<|f2 / f|<3.1 with the effective focal length f of the optical lens; the focal length f3 of the third lens G3 satisfies 2.3<|f3 / f|<2.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens G4 satisfies 1.5<|f4 / f|<1.6 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens G5 satisfies 3.7<f5 / f<3.8 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens G6 satisfies f satisfies 3.0<f6 / f<3.1; the focal length f7 of the seventh lens G7 and the effective focal length f of the optical lens satisfy 5.1<f7 / f<5.2; the focal length f8 of the eighth lens G8 and the effective focal length f of the optical lens satisfy 5.1<f8 / f<5.2; the focal length f9 of the ninth lens G9 and the effective focal length f of the optical lens satisfy 2.7<f9 / f<2.8; the focal length f10 of the tenth lens G10 and the effective focal length f of the optical lens satisfy 9.5<|f10 / f|<9.6; the focal length f11 of the eleventh lens G11 and the effective focal length f of the optical lens satisfy 7.7<f11 / f<7.8.

[0212] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.62, and the Abbe number V1 is 60.3; the refractive index N2 of the second lens G2 is 1.62, and the Abbe number V2 is 63.4; the refractive index N3 of the third lens G3 is 1.68, and the Abbe number V3 is 55.5; the refractive index N4 of the fourth lens G4 is 1.85, and the Abbe number V4 is 23.8; the refractive index N5 of the fifth lens G5 is 1.73, and the Abbe number V5 is 54.7; the refractive index of the sixth lens G6 is 1.68, and the Abbe number V3 is 55.5; The refractive index N6 of the seventh lens element G7 is 1.85, and the Abbe number V6 is 23.8; the refractive index N7 of the seventh lens element G7 is 1.85, and the Abbe number V7 is 30.1; the refractive index N8 of the eighth lens element G8 is 1.62, and the Abbe number V8 is 63.4; the refractive index N9 of the ninth lens element G9 is 1.62, and the Abbe number V10 is 63.4; the refractive index N10 of the tenth lens element G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index N11 of the eleventh lens G11 is 1.92, and the Abbe number V11 is 20.9.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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: 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, and an eleventh lens arranged coaxially in sequence from the object side to the image side; The first lens has positive focal power, and the second lens and the third lens have negative focal power; the fourth lens and the fifth lens are cemented lenses, and the difference in Abbe numbers between the fourth lens and the fifth lens is greater than 25; the fourth lens has negative focal power, and the fifth lens has positive focal power; the sixth lens, the seventh lens, the eighth lens, and the ninth lens all have positive focal power; an aperture stop is provided between the seventh lens and the eighth lens, and the incident surface of the eighth lens facing the aperture stop is a concave surface; the tenth lens and the eleventh lens are cemented lenses, and the difference in Abbe numbers between the tenth lens and the eleventh lens is greater than 45; the tenth lens and the eleventh lens each have negative focal power; The eleven lenses of the optical lens include at least two lens groups, and each lens group includes at least two lenses with the same refractive index and Abbe number; The half field angle of the optical lens is 30° to 40°; the image target surface size IMG of the optical lens is 8mm to 14mm; and the effective focal length f of the optical lens is 6mm to 10mm.

2. The optical lens according to claim 1, wherein: The refractive index and Abbe number of the second lens, the eighth lens, and the ninth lens are respectively the same; The refractive index and Abbe number of the fourth lens and the sixth lens are respectively the same.

3. The optical lens according to claim 1, wherein: The first lens, the second lens and the third lens form a front lens group; The fourth lens, the fifth lens, the sixth lens and the seventh lens form a middle lens group; The eighth lens, the ninth lens, the tenth lens, and the eleventh lens form a rear lens group; The front lens group has negative optical power; the middle lens group and the rear lens group each have positive optical power; An axial distance d12 between the front lens group and the middle lens group, and an axial distance d23 between the middle lens group and the rear lens group satisfy d23>d12.

4. The optical lens according to claim 3, wherein: The focal length fa of the front lens group is -18mm to -8mm; The focal length fb of the middle lens group is 13mm to 23mm; The focal length fc of the rear lens group is 13mm to 23mm; An axial distance d12 between the front lens group and the middle lens group is 2 mm to 7 mm; an axial distance d23 between the middle lens group and the rear lens group is 9 mm to 14 mm.

5. The optical lens according to claim 3, wherein: The focal length fa of the front lens group and the effective focal length f of the optical lens satisfy 1.50<|fa / f|<1.51, the focal length fb of the middle lens group and the effective focal length f of the optical lens satisfy 2.40<fb / f<2.45, and the focal length fc of the rear lens group and the effective focal length f of the optical lens satisfy 2.30<fc / f<2.31; An axial distance d12 between the front lens group and the middle lens group and an axial distance d23 between the middle lens group and the rear lens group satisfy 0.3<d12 / d23<0.

4.

6. The optical lens according to claim 1, wherein: The first lens has a positive thermo-optic coefficient, the second lens has a positive thermo-optic coefficient, and the third lens has a negative thermo-optic coefficient; The fourth lens has a negative thermo-optic coefficient, and the fifth lens has a positive thermo-optic coefficient; The sixth lens has a negative thermo-optic coefficient; The seventh lens has a negative thermo-optic coefficient; The eighth lens has a positive thermo-optic coefficient, and the ninth lens has a positive thermo-optic coefficient; The tenth lens has a positive thermo-optic coefficient; The eleventh lens has a negative thermo-optic coefficient; The first lens, the second lens, the eighth lens, and the ninth lens have the same refractive index; The fourth lens, the sixth lens, and the seventh lens have the same refractive index.

7. The optical lens according to claim 1, wherein: 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 biconvex lens, the fifth lens is a biconvex lens, the sixth lens is a biconvex lens, the seventh lens is a convex-concave lens, the eighth lens is a concave-convex lens, the ninth lens is a biconvex lens, the tenth lens is a biconvex lens, and the eleventh lens is a concave-convex lens.

8. The optical lens according to claim 1, wherein: The curvature radius R11 of the incident surface of the first lens is 29.0mm~42.5mm, and the curvature radius R12 of the exit surface is 110.9mm~162.2mm; the curvature radius R21 of the incident surface of the second lens is 16.7mm~24.5mm, and the curvature radius R22 of the exit surface is 6.8mm~10.1mm; the curvature radius R31 of the incident surface of the third lens is 25.0mm~36.7mm, and the curvature radius R32 of the exit surface is 7.1mm m~10.5mm; the curvature radius R41 of the incident surface of the fourth lens is -14.1mm~-9.6mm, and the curvature radius R42 of the exit surface is 12.4mm~18.2mm; the curvature radius R51 of the incident surface of the fifth lens is 12.4mm~18.2mm, and the curvature radius R52 of the exit surface is -21.7mm~-14.8mm; the curvature radius R61 of the incident surface of the sixth lens is 51.6mm~75.5mm, and the curvature radius R62 of the exit surface is 12.4mm~18.2mm. The radius R62 is -29.3mm to -23.7mm; the curvature radius R71 of the incident surface of the seventh lens is 25.6mm to 37.5mm, and the curvature radius R72 of the exit surface is 258.2mm to 377.5mm; the curvature radius R81 of the incident surface of the eighth lens is -376.2mm to -257.3mm, and the curvature radius R82 of the exit surface is -28.2mm to -19.2mm; the curvature radius R91 of the incident surface of the ninth lens is 4 The angle of curvature of the incident surface of the tenth lens is 0.1mm~58.8mm, and the radius of curvature R92 of the exit surface is -48.3mm~-33.0mm; the radius of curvature R101 of the incident surface of the tenth lens is 26.8mm~39.2mm, and the radius of curvature R102 of the exit surface is -12.0mm~-8.1mm; the radius of curvature R111 of the incident surface of the eleventh lens is -12.0mm~-8.1mm, and the radius of curvature R112 of the exit surface is -68.9mm~-47.1mm.

9. The optical lens according to claim 8, wherein: The curvature radius R41 of the incident surface of the fourth lens and the curvature radius R52 of the exit surface of the fifth lens satisfy 0.4<R41 / R52<1.0; A curvature radius R101 of the incident surface of the tenth lens and a curvature radius R112 of the exit surface of the eleventh lens satisfy 0.3<|R101 / R112|<0.

9.

10. The optical lens according to claim 1, wherein: The center thickness GT1 of the first lens is 3.3 mm to 4.9 mm; the center thickness GT2 of the second lens is 0.9 mm to 1.5 mm; the center thickness GT3 of the third lens is 0.9 mm to 1.5 mm; the center thickness GT4 of the fourth lens is 0.9 mm to 1.4 mm; the center thickness GT5 of the fifth lens is 3.6 mm to 5.3 mm; the center thickness GT6 of the sixth lens is 2.6 mm to 3.8 mm; the center thickness GT7 of the seventh lens is 1.9 mm to 2.8 mm; the center thickness GT8 of the eighth lens is 1.5 mm to 2.3 mm; the center thickness GT9 of the ninth lens is 1.5 mm to 2.4 mm; the center thickness GT10 of the tenth lens is 2.4 mm to 3.6 mm; and the center thickness GT11 of the eleventh lens is 0.8 mm to 1.2 mm.

11. The optical lens according to claim 10, wherein: The center thickness GT4 of the fourth lens and the center thickness GT5 of the fifth lens satisfy 0.16<GT4 / GT5<0.4; The central thickness GT10 of the tenth lens and the central thickness GT11 of the eleventh lens satisfy 2.0<GT10 / GT11<4.

5.

12. The optical lens according to claim 1, wherein: An air distance AT1 between the first lens and the second lens along the optical axis is 0.07 mm to 0.11 mm; an air distance AT2 between the second lens and the third lens along the optical axis is 3.40 mm to 5.00 mm; an air distance AT3 between the third lens and the fourth lens along the optical axis is 3.59 mm to 5.26 mm; the fourth lens and the fifth lens are cemented lenses; an air distance AT4 between the fifth lens and the sixth lens along the optical axis is 0.07 mm to 0.10 mm; and an air distance AT5 between the sixth lens and the seventh lens along the optical axis is 0.11 mm to 0.18 mm. The air distance AT6 between the seventh lens and the aperture stop along the optical axis is 6.57 mm to 9.61 mm; the air distance AT7 between the aperture stop and the eighth lens along the optical axis is 2.74 mm to 4.02 mm; the air distance AT8 between the eighth lens and the ninth lens along the optical axis is 0.07 mm to 0.12 mm; the air distance AT9 between the ninth lens and the tenth lens along the optical axis is 0.07 mm to 0.11 mm; the tenth lens and the eleventh lens are cemented lenses; and the air distance BFL between the eleventh lens and the image plane along the optical axis is 9.05 mm to 13.24 mm.

13. The optical lens according to claim 12, wherein: The air distance AT6 between the seventh lens and the aperture stop along the optical axis and the air distance AT7 between the aperture stop and the eighth lens along the optical axis satisfy 9.3<AT6+AT7<13.7; The air distance BFL between the eleventh lens and the image plane along the optical axis and the total optical length TTL of the system satisfy 0.13<BFL / TTL<0.

3.

14. The optical lens according to claim 1, wherein: The focal length f1 of the first lens is 62.7 mm to 91.6 mm; the focal length f2 of the second lens is -28.6 mm to -19.6 mm; the focal length f3 of the third lens is -22.1 mm to -15.1 mm; the focal length f4 of the fourth lens is -15.0 mm to -10.3 mm; the focal length f5 of the fifth lens is 24.5 mm to 35.8 mm; the focal length f6 of the sixth lens is 19.7 mm to 28.8 mm; the focal length f7 of the seventh lens is 33.6 mm to 49.1 mm; the focal length f8 of the eighth lens is 33.7 mm to 49.3 mm; the focal length f9 of the ninth lens is 18.1 mm to 26.4 mm; the focal length f10 of the tenth lens is -90.7 mm to -62.0 mm; and the focal length f11 of the eleventh lens is -73.9 mm to -50.6 mm.

15. The optical lens according to claim 14, wherein: The focal length f1 of the first lens satisfies 6.6<f1 / f<14.1 with the effective focal length f of the optical lens; the focal length f2 of the second lens satisfies 2.0<|f2 / f|<4.4 with the effective focal length f of the optical lens; the focal length f3 of the third lens satisfies 1.5<|f3 / f|<3.4 with the effective focal length f of the optical lens; the focal length f4 of the fourth lens satisfies 1.0<|f4 / f|<2.4 with the effective focal length f of the optical lens; the focal length f5 of the fifth lens satisfies 2.5<f5 / f<5.6 with the effective focal length f of the optical lens; the focal length f6 of the sixth lens satisfies The focal lengths f satisfy 2.0<f6 / f<4.5; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy 3.5<f7 / f<7.6; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy 3.5<f8 / f<7.6; the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy 1.9<f9 / f<4.1; the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy 6.5<|f10 / f|<1.4; the focal length f11 of the eleventh lens and the effective focal length f of the optical lens satisfy 5.3<f11 / f<11.

4.

16. The optical lens according to claim 1, wherein: The refractive index N1 of the first lens is 1.6-1.65, and the Abbe number V1 is 60-60.5; the refractive index N2 of the second lens is 1.6-1.65, and the Abbe number V2 is 63-63.5; the refractive index N3 of the third lens is 1.65-1.7, and the Abbe number V3 is 55.5-56; the refractive index N4 of the fourth lens is 1.85-1.9, and the Abbe number V4 is 23.5-24.0; the refractive index N5 of the fifth lens is 1.7-1.75, and the Abbe number V5 is 54.5-55; the refractive index N6 of the sixth lens is 1.85- The optical system comprises a first lens element, a second lens element, and a second lens element. The first lens element comprises a first lens element and a second lens element. The first lens element comprises a first lens element and a second lens element. The first lens element comprises a first lens element and a second lens element. The first lens element comprises a first lens element and a second lens element. The first lens element comprises a first lens element and a second lens element.

17. The optical lens according to claim 1, wherein: The optical lens has an effective focal length f of 6.5 mm to 9.5 mm, an aperture number Fno of F2.3, a half field angle of 35.6°, an image target surface size IMG of 8.92 mm to 13.04 mm, an operating wavelength of 400 nm to 700 nm, and a total optical length TTL of 46.4 mm to 67.8 mm. The effective focal length f of the optical lens and the image target surface size IMG of the optical lens satisfy 0.7<f / IMG<0.

75.

18. The optical lens according to any one of claims 1 to 17, wherein: The field curvature value of the full field of view of the optical lens is less than 0.05mm; The distortion curve of the optical lens changes monotonically over the entire field of view; The full-field MTF value of the optical lens has a contrast ratio of greater than 0.7 at a spatial frequency of 90 lp / mm; The full-field MTF value of the optical lens has a contrast attenuation of zero at a spatial frequency of 600 lp / mm; The full-field relative illumination of the optical lens is greater than 93%.

19. The optical lens according to any one of claims 1 to 17, wherein: In the range of -20°C to 60°C, the change in contrast of the full-field MTF value of the optical lens at a spatial frequency of 90lp / mm is less than 0.05; In the temperature range of -20°C to 60°C, the focus shift variation of the optical lens is less than 0.005mm.

20. The optical lens according to any one of claims 1 to 17, wherein: Each lens of the optical lens is a glass lens, and each lens of the optical lens is a spherical lens.

21. An electronic device, characterized in that: The optical lens comprises the optical lens according to any one of claims 1 to 20.

22. The electronic device according to claim 21, wherein: The electronic device is a camera.

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