Optical lens, camera and movable platform

Abstract

The utility model relates to the technical field of image acquisition, in particular to an optical lens, a camera and a movable platform. The optical lens comprises a first lens group and a second lens group which are sequentially arranged from an object side to an image side, the first lens group has negative focal power, the second lens group has positive focal power, the first lens group comprises a first lens closest to the object side, and the first lens is an aspheric glass lens with negative focal power. By applying the technical scheme of the invention, the problem of low imaging accuracy of a camera in the related technology can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of image acquisition, and in particular to an optical lens, a camera and a movable platform. Background Art

[0002] In recent years, with the continuous development of science and technology, cars have begun to move towards autonomous driving. For cars to achieve assisted driving and autonomous driving, target recognition and obstacle recognition systems based on high-definition on-board imaging lenses are essential. Autonomous driving obtains external information through on-board imaging lenses, etc., and perceives the surrounding environment of the car after image algorithm processing, so that it can drive autonomously safely.

[0003] Currently, most of the automotive imaging lenses on the market are wide-angle lenses or ultra-wide-angle lenses with a large field of view. This type of lens can collect light from a large field of view, thereby obtaining as much external information as possible.

[0004] However, while this type of lens can accurately identify objects near the vehicle body, it has poor accuracy in identifying distant targets and small obstacles, and is unable to provide timely warnings for distant targets and small obstacles, affecting the safety of autonomous vehicles when driving at high speeds. Utility Model Content

[0005] The present application provides an optical lens, a camera and a movable platform to solve the problem of low accuracy of the camera in the related art.

[0006] In one aspect, the present application provides an optical lens, comprising: a first lens group and a second lens group arranged in sequence from the object side to the image side, wherein:

[0007] The first lens group has negative optical power, the second lens group has positive optical power, the first lens group includes a first lens closest to the object side, and the first lens is an aspherical glass lens with negative optical power.

[0008] In some embodiments, the light passing diameter of the first lens is D1, the maximum image circle diameter of the imaging surface of the optical lens is IMH, the distance between the outermost end point on the object side of the first lens of the optical lens and the imaging surface is TTL, and D1, IMH and TTL satisfy:

[0009] D1 / IMH≤1.2, and IMH / TTL≥0.28.

[0010] In some embodiments, the material of the first lens satisfies:

[0011] Nd>1.70 and Vd>40,

[0012] Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

[0013] In some embodiments, the second lens group further includes a second lens closest to the object side, the second lens has positive optical power, and both the object-side surface and the image-side surface of the second lens are convex surfaces.

[0014] In some embodiments, the material of the second lens satisfies:

[0015] Nd<1.7 and Vd≥55,

[0016] Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

[0017] In some embodiments, the first lens group further includes a third lens, which is disposed at the image side of the first lens. The third lens is a glass lens with negative optical power. The object side surface of the third lens is concave, and the image side surface is convex.

[0018] In some embodiments, the second lens group further includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed at the image side end of the second lens;

[0019] The fourth lens has positive power, the fifth lens has negative power, the sixth lens has positive power, and the seventh lens has negative power.

[0020] In some embodiments, the fourth lens and the fifth lens form a cemented lens with positive power, and the Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens satisfy: Vd4-Vd5≥40.

[0021] In some embodiments, the first lens group includes a first lens and a third lens arranged in sequence from the object side to the image side, and the second lens group includes a second lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side;

[0022] The object side surface of the first lens is convex, and the image side surface is concave;

[0023] The third lens has negative optical power, the object side surface of the third lens is concave, and the image side surface is convex;

[0024] The second lens has positive power, and the object side surface of the third lens is convex, and the image side surface is convex;

[0025] The fourth lens has positive refractive power, and the object-side surface and image-side surface of the fourth lens are convex;

[0026] The fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens is an aspherical glass lens with negative optical power. In some embodiments, the optical lens further includes an aperture, which is disposed between the first lens group and the second lens group;

[0027] and / or,

[0028] The optical lens also includes a filter and an image plane, which are sequentially arranged at the image side end of the second lens group.

[0029] In some embodiments, the optical focal length f1 of the first lens group satisfies: -30 mm ≤ f1 ≤ -15 mm;

[0030] and / or,

[0031] The optical focal length f2 of the second lens group satisfies: 5mm≤f2≤15mm;

[0032] and / or,

[0033] The optical focal length f1 of the first lens group and the optical focal length f2 of the second lens group satisfy: -6≤f1 / f2≤-1.

[0034] On the other hand, the present application also provides a camera including the above-mentioned optical lens.

[0035] On the other hand, the present application also provides a movable platform, including the above-mentioned camera.

[0036] The optical lens provided by the present application is arranged on the object side by setting the first lens group with negative optical power and the image side by setting the second lens group with positive optical power, so that the first lens group can obtain a distant target, so that the optical lens can clearly capture the details of the distant scene and improve the recognition accuracy of the distant target. The second lens group with positive optical power can help focus on small targets, so that the lens can effectively capture the details of small targets and improve the recognition accuracy of small targets. The miniaturization and high pixel of the optical lens are ensured by setting the first lens as an aspherical glass lens with negative optical power, so that the pixel of the optical lens can reach the level of tens of millions. In addition, the first lens helps to improve the field of view acquisition range, and with the material of its aspherical glass, it can ensure high pixel while meeting the miniaturization of the optical lens, which helps to achieve the miniaturization of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 A schematic diagram of the structure of an optical lens provided in an embodiment of the present application;

[0039] Figure 2a A schematic diagram of a first group of optical aberrations of the optical lens provided in an embodiment of the present application;

[0040] Figure 2bA schematic diagram of a second group of optical aberrations of the optical lens provided in an embodiment of the present application;

[0041] Figure 3 An astigmatism curve diagram of the optical lens provided in an embodiment of the present application;

[0042] Figure 4 A distortion curve diagram of the optical lens provided in an embodiment of the present application;

[0043] Figure 5a A schematic diagram of a first group of points of an optical lens provided in an embodiment of the present application;

[0044] Figure 5b A schematic diagram of a second group of points of the optical lens provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of the MTF curve of the optical lens provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of the chromatic aberration of magnification of the optical lens provided in an embodiment of the present application.

[0047] Description of reference numerals:

[0048] 10. Optical lens;

[0049] 100, first lens group; 110, first lens; 120, third lens;

[0050] 200, second lens group; 210, second lens; 220, fourth lens; 230, fifth lens; 240, sixth lens; 250, seventh lens;

[0051] 300, aperture;

[0052] 400, filter;

[0053] 500. Imaging surface. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] Cameras play an important role in the field of vehicle autonomous driving systems, aircraft (such as drones), and robot vision acquisition, and have multiple functions. Taking vehicle autonomous driving as an example, cameras have the following functions: Environmental perception: The camera can monitor the roads, traffic signs, vehicles, and pedestrians around the vehicle in real time to help the system identify and understand the surrounding environment. Lane keeping: The camera can monitor the position of the vehicle on the road and help the system keep the vehicle in the correct lane. Forward collision warning: The camera can monitor the vehicles and obstacles ahead to help the system issue collision warnings and take avoidance measures in time. Pedestrian and animal recognition: The camera can recognize pedestrians and animals to help the system avoid collisions during driving. Traffic signal recognition: The camera can recognize the status of traffic lights to help the system make corresponding driving decisions. Blind spot monitoring: The camera can monitor the blind spots of the vehicle to help the system remind the driver or make automatic avoidance. These functions make the camera play a vital role in the autonomous driving system and improve the safety and automation level of the vehicle.

[0056] How to identify long-distance and small targets is crucial in the above-mentioned environmental perception, forward collision warning, and pedestrian and animal recognition functions.

[0057] Currently, most of the optical lenses on the market are wide-angle lenses or ultra-wide-angle lenses with a large field of view. This type of lens can collect light from a larger field of view, thereby obtaining as much external information as possible.

[0058] However, this type of lens is large in size and can accurately identify objects near the vehicle body, but has poor recognition accuracy for distant targets and small obstacles. It is unable to provide timely warnings for distant targets and small obstacles, affecting the safety of autonomous vehicles when driving at high speeds.

[0059] In view of this, the present application provides an optical lens camera and a movable platform, which realizes the miniaturization of the optical lens and the precision of recognition by setting lens groups with different optical focal lengths and matching appropriate lenses in each lens group.

[0060] The optical lens and camera provided in the embodiments of the present application are described below with reference to the accompanying drawings.

[0061] It should be noted that lens and camera are two common concepts in the field of photography and videography, and there are the following differences between them: Lens is a component of photographic equipment, which is used to focus light and gather light onto a photosensitive element (such as film or sensor) to form an image. Lenses usually include components such as lenses, apertures, and focus rings, and different shooting effects can be achieved according to parameters such as focal length and aperture size. The lens is the core component in the photography process and directly affects the image quality and effect. Camera refers to an overall device that includes components such as lenses, photosensitive elements, and image processing chips, which are used to capture, process, and output image or video signals. Cameras can be independent devices or integrated into mobile phones, computers, surveillance cameras, and other devices. Cameras usually include components such as lenses, sensors, and processors to achieve image or video acquisition and processing.

[0062] It should also be noted that the actual use scenarios of the optical lens and camera of this embodiment are not limited to vehicles, but can also be applied to other movable devices to meet the needs of movable devices for image acquisition during movement, such as framing of aircraft such as drones, and field of view acquisition of mechanical structures such as robots and robotic arms.

[0063] like Figure 1 As shown, the optical lens 10 provided in this embodiment includes: a first lens group 100 and a second lens group 200 arranged in sequence from the object side to the image side.

[0064] The first lens group 100 has negative optical power, the second lens group 200 has positive optical power, and the first lens group 100 includes a first lens 110 closest to the object side. The first lens 110 is an aspherical glass lens with negative optical power.

[0065] By applying the technical solution of this embodiment, the first lens group 100 with negative optical power can be used to expand the light beam, so that the light diverges after passing through the lens, thereby achieving focusing on a distant target. Secondly, the first lens group 100 with negative optical power can correct spherical distortion and chromatic aberration, and improve the imaging quality of the optical system. At the same time, the negative optical power lens can also be used to adjust the optical path, change the propagation direction and focal length of the light, and optimize the performance of the optical system.

[0066] The second lens group 200 with positive power can focus the incident light to a focal point, thereby focusing and imaging the light. This helps capture the details of distant targets and improves the clarity of imaging. In addition, the second lens group 200 with positive power can also be used to correct spherical distortion and chromatic aberration, thereby improving the imaging quality of the optical system.

[0067] In addition, the spherical lens will cause spherical distortion due to the limitation of its curvature radius. In this embodiment, the first lens 110 closest to the object side in the first lens group 100 is set as an aspherical glass lens, and the aspherical curvature is used to eliminate or reduce this distortion and improve the imaging quality. In addition, the curvature of the aspherical lens can be optimized according to the requirements of the optical path design, thereby reducing aberrations and improving the performance of the optical system. At the same time, the first lens 110 has a negative optical power, which has a wide field of view acquisition range. With its aspherical glass material, it can meet the miniaturization of the optical lens 10 while ensuring high pixels, which helps to achieve the miniaturization of the optical lens 10.

[0068] Therefore, in this embodiment, by setting the first lens group 100 with negative optical power on the object side and the second lens group 200 with positive optical power on the image side, the first lens group 100 helps to acquire distant targets, so that the lens can clearly capture the details of distant scenes and improve the recognition accuracy of distant targets. The second lens group 200 with positive optical power can help focus on small targets, so that the lens can effectively capture the details of small targets and improve the recognition accuracy of small targets. By setting the first lens 110 as an aspherical glass lens with negative optical power, the miniaturization and high pixel of the optical lens 10 are ensured, so that the pixel of the optical lens 10 can reach tens of millions.

[0069] In some embodiments, the optical lens 10 further includes an imaging surface 500; the light passing diameter of the first lens 110 is D1, the maximum image circle diameter of the imaging surface 500 of the optical lens 10 is IMH, the distance between the outermost end point on the object side of the first lens 110 of the optical lens 10 and the imaging surface 500 is TTL, and D1, IMH and TTL satisfy:

[0070] D1 / IMH≤1.2, and IMH / TTL≥0.28.

[0071] In the above structure, the light diameter D1 determines the amount of light received by the first lens 110, which directly affects the brightness and signal-to-noise ratio of the image. A larger D1 can improve the brightness of the image, but it will also increase the size and cost of the lens.

[0072] The maximum image circle diameter IMH of the imaging plane 500 refers to the maximum acceptable object size on the imaging plane 500. This parameter is related to the field angle and focal length of the lens. The size of IMH determines the field of view of the lens, that is, the range of scenes that the lens can capture.

[0073] The distance TTL between the outermost end point on the object side and the imaging surface is the total tracking length of the lens, which affects the focal length of the lens and the design of the optical system. A shorter TTL is beneficial to reducing the size and weight of the lens, but at the same time it may limit the focal length and field of view of the lens.

[0074] D1 / IMH≤1.2 means that the light diameter D1 will not exceed 1.2 times of the maximum image circle diameter IMH of the imaging surface. This ensures that sufficient light passes through without significantly increasing the size of the lens, thereby obtaining a better imaging effect.

[0075] IMH / TTL ≥ 0.28 indicates that the maximum image circle diameter IMH of the imaging plane is at least 0.28 times the total tracking length TTL, thereby ensuring that the lens has sufficient field of view to capture the desired scene while maintaining a compact design of the lens.

[0076] Therefore, making D1, IMH and TTL satisfy D1 / IMH≤1.2 and IMH / TTL≥0.28 makes the optical lens both compact and has good optical performance, which helps the optical lens meet the occasions with strict requirements on lens size, field of view and imaging quality such as automobile safety monitoring and autonomous driving.

[0077] Illustratively, the ratio of D1 / IMH includes but is not limited to 0.6, 0.8, 1.0, and 1.2; the ratio of IMH / TTL includes but is not limited to 0.28, 0.30, and 0.32.

[0078] Furthermore, in some embodiments, the material of the first lens 110 satisfies: Nd>1.70 and Vd>40,

[0079] Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

[0080] In the above structure, the Nd value is greater than 1.70, which indicates that the material of the first lens 110 has a strong refractive power for d-light (usually yellow light, sodium D-ray with a wavelength of about 589.3 nanometers), that is, the first lens 110 has a higher refractive index. A higher refractive index indicates that the light is bent more when passing through the first lens 110.

[0081] It should be noted that the Vd value (also called the dispersion coefficient or Abbe number) represents the degree of dispersion of the material. Dispersion is the phenomenon that when light passes through a substance, light of different wavelengths will have different refractive indices, resulting in different focusing points and chromatic aberration. The larger the Vd value, the smaller the dispersion of the material, and vice versa. Therefore, the material of the first lens 110 satisfies: Nd>1.70 and Vd>40, which means that the first lens 110 has a larger d-light refractive power and a lower degree of dispersion, so that the first lens 110 can maintain low dispersion while being able to change the optical path.

[0082] Therefore, the material of the first lens 110 has a high refractive index and a low dispersion coefficient, which allows the lens to be designed to be lighter and thinner, while providing high-quality imaging effects, reducing chromatic aberration, and improving imaging clarity and contrast.

[0083] In some embodiments, the second lens group 200 also includes a second lens 210 closest to the object side, the second lens 210 has positive optical power, the second lens 210 has a first end face close to the object side and a second end face close to the image side, the first end face of the second lens 210 is convexly arranged toward the object side, and the second end face of the second lens 210 is convexly arranged toward the image side.

[0084] In the above structure, the second lens group 200 includes a second lens 210 closest to the object side, which has a positive optical focal length, indicating that the second lens 210 can converge the incident light to form a real image. The design of the second lens 210 includes two end faces, the first end face is close to the object side and also convex to the object side, and the second end face is close to the image side and also convex to the image side. On the one hand, this arrangement helps to reduce the reflection and scattering of light inside the lens and improve the transmittance of the optical system. In addition, the convex end face can change the path of light inside the lens, thereby optimizing the focus of light and improving the image quality.

[0085] Furthermore, in some embodiments, the material of the second lens 210 satisfies:

[0086] Nd<1.7 and Vd≥55,

[0087] Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

[0088] In the above structure, the lens material with Nd less than 1.7 and Vd greater than or equal to 55 indicates that the second lens 210 has a relatively low refractive index and a relatively high dispersion coefficient.

[0089] Specifically, a material with a lower d-index (Nd) means that light is less bent when passing through the lens, which helps reduce aberrations, especially spherical aberrations. Therefore, the second lens 210 can be used to correct or reduce aberrations introduced by other lens components and improve imaging quality.

[0090] Vd≥55 indicates that the Vd value of the second lens 210 is at least 55. The larger the Vd value, the smaller the dispersion degree of the material. Therefore, the second lens 210 has a lower dispersion degree while having a smaller d-light refractive index, which means that it can better keep the focus points of different color lights consistent, thereby improving the chromatic aberration correction performance of the image.

[0091] Therefore, the second lens 210, as part of the second lens group, can further focus the light, ensure that the light converges correctly on the image plane, and form a clear real image. It can also correct the residual aberrations introduced by the previous lens components, such as spherical aberration, coma, etc.

[0092] In some embodiments, the first lens group 100 further includes a third lens 120, which is disposed at the image side end of the first lens 110, and is a glass lens with negative optical power. In addition, the third lens 120 has a first end surface close to the object side and a second end surface close to the image side, the object side surface of the third lens 120 is a concave surface, and the image side surface is a convex surface, that is, the third lens 120 is a meniscus-shaped negative optical power glass lens.

[0093] In the above structure, the third lens 120 is a part of the first lens group 100. Its negative optical power characteristic enables it to diverge the incident parallel light beam, so that the light path emitted through the third lens 120 becomes smooth, which helps to correct the aberrations generated by the optical lens, especially spherical aberration and axial chromatic aberration.

[0094] In addition, since the third lens 120 is disposed at the image side end of the first lens 110, it can further adjust and optimize the imaging effect of the first lens 110. Specifically, the object side surface of the third lens 120 is a concave surface, and the image side surface is a convex surface. Such a design helps to reduce the overall thickness of the lens group, and may also help to control the propagation of the light path, reduce the reflection and scattering of light between lenses, thereby improving the light transmittance and imaging quality of the optical system.

[0095] In addition, the concave end surface of the third lens 120 may help reduce the overall volume of the lens group, making the entire optical system more compact. At the same time, the design of the concave end surface may also help improve the anti-reflection performance of the optical system, because the concave surface can guide light to enter the lens more effectively.

[0096] In some embodiments, the second lens group 200 further includes a fourth lens 220, a fifth lens 230, a sixth lens 240 and a seventh lens 250 which are sequentially arranged at the image side end of the second lens 210, wherein the fourth lens 220 has positive optical power, the fifth lens 230 has negative optical power, the sixth lens 240 has positive optical power, and the seventh lens 250 has negative optical power.

[0097] In the above structure, the second lens 210 has positive focal power, and its function is to converge the light. The fourth lens 220 also has positive focal power, and continues to enhance the function of converging the light. The fifth lens 230 has negative focal power, and it will diverge the light again. This can be used to correct the excessive convergence that may be introduced by the second lens 210 and the fourth lens 220, thereby improving the imaging quality. The sixth lens 240 has positive focal power, and further converges the light, while the seventh lens 250 is an aspherical glass lens with negative focal power. The aspherical lens can effectively correct aberrations, especially spherical aberration and coma, and also helps to further adjust the focal length and shape of the light.

[0098] In addition, the second lens 210 and the fourth lens 220 are both structures with convex object side and image side. The structure of the two lenses combined together and the materials of the two lenses (specific Nd and Vd values ​​can be used to limit the materials of the lenses) help to expand the applicable temperature of the lenses, effectively reduce the back focus temperature drift of the imaging lens, and improve its optical stability in low and high temperature states. Further, in some embodiments, the fourth lens 220 and the fifth lens 230 form a cemented lens with positive focal length, and the Abbe number Vd4 of the fourth lens 220 and the Abbe number Vd5 of the fifth lens 230 satisfy: Vd4-Vd5≥40.

[0099] In the above structure, both sides of the fourth lens 220 are positive optical focal length glass lenses convex outward, and the fifth lens 230 is a meniscus-shaped negative optical focal length glass lens with a concave object side surface and a convex image side surface. The fourth lens 220 and the fifth lens 230 form a cemented lens with positive optical focal length, which can further reduce the dispersion of the system, effectively improve the imaging quality, and achieve high pixels.

[0100] Exemplarily, the difference between Vd4 and Vd5 includes, but is not limited to, 40, 45, and 50.

[0101] It should be noted that, in some embodiments, the optical lens may include 7 lenses. Specifically, the first lens group 100 includes a first lens 110 and a third lens 120 arranged in sequence from the object side to the image side, the first lens 110 is an aspherical glass lens with negative optical power, and the third lens 120 is a glass lens with negative optical power.

[0102] The second lens group 200 includes a second lens 210 , a fourth lens 220 , a fifth lens 230 , a sixth lens 240 and a seventh lens 250 which are sequentially arranged from the object side to the image side.

[0103] Among them, the object side surface of the first lens is convex, and the image side surface is concave; the third lens has negative optical power, the object side surface of the third lens is concave, and the image side surface is convex; the second lens has positive optical power, the object side surface of the second lens is convex, and the image side surface is convex; the fourth lens has positive optical power, the object side surface of the fourth lens is convex, and the image side surface is convex; the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens is an aspherical glass lens with negative optical power.

[0104] In the above structure, the first lens 110 and the third lens 120 constitute the first lens group 100. The third lens 120 has negative optical power, so that the first lens group 100 can diverge light, correct aberrations, and change the propagation direction of light, so that the subsequent second lens group 200 can focus light more effectively.

[0105] The second lens group 200 includes the second lens 210 to the seventh lens 250. The second lens 210 has positive optical power, and its function is to converge the light. The fourth lens 220 also has positive optical power, and continues to strengthen the function of converging the light. The fifth lens 230 has negative optical power, and it will diverge the light again. This can be used to correct the excessive convergence that may be introduced by the second lens 210 and the fourth lens 220, thereby improving the imaging quality. The sixth lens 240 has positive optical power and further converges the light, and the seventh lens 250 is an aspherical glass lens with negative optical power. The aspherical lens can effectively correct aberrations, especially spherical aberration and coma, and also helps to further adjust the focus and shape of the light.

[0106] The lens combination of the above optical lens and their respective optical power configuration enable the optical lens to achieve the best imaging effect, which helps to improve the clarity of distant targets and small targets. The interaction between the lenses can correct various optical aberrations and improve the resolution and contrast of the image. The first lens and the seventh lens use aspherical glass lenses to further improve the performance of the optical system. Aspherical lenses can provide better imaging quality than traditional spherical lenses.

[0107] It should be noted that, in some embodiments, the optical lens 10 further includes an aperture 300, a filter 400 and an imaging surface 500, the aperture 300 is arranged between the first lens group 100 and the second lens group 200, and the filter 400 and the imaging surface 500 are sequentially arranged at the image side end of the second lens group 200.

[0108] In the above structure, the aperture 300 can adjust the amount of light entering the lens. The aperture 300 is located between the first lens group 100 and the second lens group 200, so that the depth of field and exposure can be controlled according to different lighting conditions and shooting requirements. Exemplarily, the aperture 300 is composed of a plurality of movable shutters, and the size of the aperture 300 can be adjusted by changing the opening and closing degree of the blades, thereby affecting the light intensity entering the lens and the clarity of the image.

[0109] The filter 400 is used to filter out unnecessary light, such as ultraviolet rays or light of a specific wavelength, and can also be used to enhance the saturation of certain colors or create special visual effects. The filter 400 is placed at the image side of the second lens group 200, so that all light passes through the filter 400 after being focused by the lens, thereby ensuring that the imaging result meets the expected visual effect.

[0110] The imaging plane 500 is the final imaging plane of the optical system, which receives light from the lens group and forms an image. In an optical lens, the image plane may be an image sensor, such as a CMOS or CCD sensor, which is responsible for capturing image data and converting it into electronic signals for further processing.

[0111] Further, in some embodiments, the optical focal length f1 of the first lens group 100 satisfies: -30mm≤f1≤-15mm. The first lens group 100 has negative optical power, and the range of the optical focal length f1 is set between -30mm and -15mm, so that the first lens group 100 has a strong divergence ability, which helps to achieve a wider field of view and improve the field of view acquisition range.

[0112] Exemplarily, the values ​​of f1 include but are not limited to -30mm, -25mm, -20mm, and -15mm.

[0113] In some embodiments, the optical focal length f2 of the second lens group 200 satisfies: 5 mm ≤ f2 ≤ 15 mm. The second lens group 200 has positive optical power, and can correct the aberration generated by the first lens group 100 to improve the imaging quality.

[0114] Exemplarily, the value of f2 includes but is not limited to 5 mm, 10 mm, and 15 mm.

[0115] In some embodiments, the optical focal length f1 of the first lens group 100 and the optical focal length f2 of the second lens group 200 satisfy: -6≤f1 / f2≤-1. The above arrangement enables the first lens group 100 to have a strong divergence effect, while the second lens group 200 has a strong convergence effect. This enables the camera to correct aberrations, increase depth of field, and control imaging clarity, which helps to increase the clarity of distant objects and small objects.

[0116] Figure 2 to Figure 7 for Figure 1 Optical performance test chart of the camera.

[0117] in, Figure 2a A schematic diagram of a first group of optical aberrations of the optical lens provided in an embodiment of the present application; Figure 2b A schematic diagram of the second set of optical aberrations of the optical lens provided in the embodiment of the present application. Figure 2a Neutralization Figure 2b The left and right figures respectively represent the optical path difference of the optical lens in the meridian direction and the sagittal direction. Different curves represent different wavelengths. The flatter the curve in the figure, the smaller the phase difference of the optical lens. It can be seen from the figure that the optical lens of this embodiment has a smaller aberration.

[0118] Figure 3 The astigmatism curve diagram of the optical lens provided in the embodiment of the present application indicates the astigmatism of the optical lens. Specifically, the horizontal axis of the diagram indicates the magnitude of the field curvature, and the vertical axis indicates the field of view from 0° to 50°. Different curves represent different wavelengths, and the wavelength is selected based on the range of visible light. Figure 3The field curvature under different fields of view can be shown. It can be seen from the figure that the optical lens of this embodiment has a better anti-astigmatism effect.

[0119] Figure 4 This is a distortion curve diagram of the optical lens provided in the embodiment of the present application. Specifically, Figure 4 The horizontal axis represents the magnitude of distortion, and the vertical axis represents the field of view from 0° to 50°. Figure 4 It is used to indicate the distortion value under different field of view angles. Figure 4 It can be seen that Figure 4 The curve in the figure is smooth, and the optical lens of this embodiment has a good anti-distortion effect.

[0120] Figure 5a A schematic diagram of a first group of points of an optical lens provided in an embodiment of the present application, Figure 5b This is a schematic diagram of the second set of points of the optical lens provided in the embodiment of the present application. The scattered points in the figure are the point diagram of light in 360° directions hitting the image plane, and the distance from the scattered points to the origin represents the optical path difference.

[0121] It has the function of evaluating the imaging quality of the optical lens and detecting aberrations. It can be seen from the figure that the optical lens of this embodiment has good imaging quality and small aberrations.

[0122] Figure 6 It is a schematic diagram of the MTF curve of the optical lens, that is, the optical modulation function curve, which has the function of describing the ability of the lens imaging system to reproduce details of different spatial frequencies. The MTF curve quantifies the imaging performance of the lens by comparing the relationship between the contrast transmitted by the system and the input contrast. The high and low values ​​on the left reflect the clarity of the optical lens imaging, and different curves represent the clarity capabilities of different positions in practice. It can be seen from the figure that the optical lens of this embodiment has higher imaging quality, lower aberration and chromatic aberration.

[0123] Figure 7 This is a schematic diagram of the magnification chromatic aberration of an optical lens. The magnification chromatic aberration schematic diagram is used to characterize the difference in the focusing ability of the optical lens for light of different wavelengths during the imaging process. This difference will cause light of different colors to not perfectly overlap on the imaging plane, resulting in chromatic aberration. This diagram can characterize the chromatic aberration performance of the optical system. Different lines represent different wavelengths. The vertical axis represents the field of view from 0° to 50°. As can be seen from the figure, the optical lens of this embodiment has a lower chromatic aberration.

[0124] On the other hand, the present application also provides a camera (not shown in the figure), and an embodiment of the camera includes the above-mentioned optical lens 10. Since the optical lens 10 has the advantages of high pixel, high clarity for identifying long-distance targets and small targets, and small size, the camera having it also has the above-mentioned advantages.

[0125] On the other hand, the present application also provides a movable platform (not shown in the figure), including the above-mentioned camera. Since the camera has the advantages of high pixel, high clarity in identifying distant targets and small targets, and small size, the movable platform having it has the advantages of high safety, small size, and easy installation.

[0126] Specifically, the movable platform can be a movable device such as a vehicle, an aircraft (such as a drone) and a robot. Since the movable platform is equipped with the camera of this embodiment, the first lens group 100 helps to obtain a distant target, so that the lens can clearly capture the details of the distant scene and improve the recognition accuracy of the distant target. The second lens group 200 with positive optical power can help focus on small targets, so that the camera can effectively capture the details of small targets and improve the recognition accuracy of small targets. By setting the first lens 110 as an aspherical glass lens with negative optical power, the miniaturization and high pixel of the optical lens 10 are guaranteed, so that the pixel of the optical lens 10 can reach tens of millions.

[0127] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0128] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0129] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0130] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0131] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by 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 implementation modes of the present application.

Claims

1. An optical lens, characterized in that: include: A first lens group and a second lens group are arranged in sequence from the object side to the image side, wherein: The first lens group has negative optical power, the second lens group has positive optical power, the first lens group includes a first lens closest to the object side, and the first lens is an aspherical glass lens with negative optical power.

2. The optical lens according to claim 1, characterized in that: The light passing diameter of the first lens is D1, the maximum image circle diameter of the imaging surface of the optical lens is IMH, the distance between the outermost end point on the object side of the first lens of the optical lens and the imaging surface is TTL, and the D1, the IMH and the TTL satisfy: D1 / IMH≤1.2, and IMH / TTL≥0.28; and / or, The material of the first lens satisfies: Nd>1.70 and Vd>40, Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

3. The optical lens according to claim 1, characterized in that: The second lens group further includes a second lens closest to the object side, the second lens has positive refractive power, and both the object side surface and the image side surface of the second lens are convex surfaces; and / or, The first lens group also includes a third lens, which is arranged at the image side end of the first lens. The third lens is a glass lens with negative optical power. The object side surface of the third lens is a concave surface, and the image side surface is a convex surface.

4. The optical lens according to claim 3, characterized in that: The material of the second lens satisfies: Nd<1.7 and Vd≥55, Among them, Nd represents the d-light refractive index of the lens material, and Vd represents the d-light dispersion coefficient of the lens material.

5. The optical lens according to claim 3, characterized in that: The second lens group further includes a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged at the image side end of the second lens; The fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power.

6. The optical lens according to claim 5, characterized in that: The fourth lens and the fifth lens form a cemented lens with positive power, and the Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens satisfy: Vd4-Vd5≥40.

7. The optical lens according to claim 1, characterized in that: The first lens group includes a first lens and a third lens arranged in sequence from the object side to the image side, and the second lens group includes a second lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side; The object side surface of the first lens is convex, and the image side surface is concave; The third lens has negative optical power, the object side surface of the third lens is concave, and the image side surface is convex; The second lens has positive power, the object side surface of the third lens is convex, and the image side surface is convex; The fourth lens has positive refractive power, the object side surface of the fourth lens is convex, and the image side surface is convex; The fifth lens has negative power, the sixth lens has positive power, and the seventh lens is an aspherical glass lens with negative power.

8. The optical lens according to any one of claims 1 to 7, characterized in that: The optical focal length f1 of the first lens group satisfies: -30mm≤f1≤-15mm; and / or, The optical focal length f2 of the second lens group satisfies: 5mm≤f2≤15mm; and / or, The optical focal length f1 of the first lens group and the optical focal length f2 of the second lens group satisfy: -6≤f1 / f2≤-1.

9. A camera, characterized in that: The optical lens comprises any one of claims 1 to 8.

10. A movable platform, characterized in that: Including the camera described in claim 9.

Images