Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device. The optical lens comprises first to sixth lenses in sequence from a first side to a second side along an optical axis. The optical power of the first to third lenses is negative, and the optical power of the fourth to sixth lenses is positive. The first side of the first lens is a convex surface, and the second side of the first lens is a concave surface. The first side of the second lens is a convex surface, and the second side of the second lens is a concave surface. The first side of the third lens is a concave surface, and the second side of the third lens is a convex surface. At least one side of each of the fourth to sixth lenses is a convex surface. The optical lens satisfies -2.05 <= (F1+F2+F3) / (F4+F5+F6) <= -1.07.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens and electronic device. Background Technology

[0002] With the development of intelligent driving technology, most car manufacturers now equip their vehicles with LiDAR lenses as the "eyes" of intelligent driving. The demand for LiDAR lenses is also increasing with the development of automotive intelligence. The wide-angle LiDAR lens of this invention can accurately detect obstacles around the vehicle and is an indispensable part of intelligent driving. However, existing lenses are large and cannot meet the current automotive requirements for reducing the size of LiDAR. Furthermore, existing large field-of-view receiving lenses have large aperture values ​​(FNO) and small light-gathering diameters, resulting in light tilting at the edges of the field of view. Additionally, considering the requirements for aberration correction, when the light incident angle is large, the correction of the rear lens is difficult, leading to poor image quality. Summary of the Invention

[0003] The first aspect of this application provides an optical lens comprising, sequentially from a first side to a second side along an optical axis, a first lens having negative optical power, a second lens having negative optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having positive optical power, and a sixth lens having positive optical power. The first lens has a first convex surface and a second concave surface; the second lens has a first convex surface and a second concave surface; the third lens has a first concave surface and a second convex surface; at least one side of the fourth lens is convex; at least one side of the fifth lens is convex; and at least one side of the sixth lens is convex. The optical lens has six lenses with optical power; the optical lens satisfies: -2.05≤(F1+F2+F3) / (F4+F5+F6)≤-1.07, where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens.

[0004] A second aspect of this application provides an electronic device, including an optical lens and at least one of an imaging element and a light source; wherein the imaging element is used to convert an optical image or optical information formed by the optical lens into an electrical signal; wherein the light source is located on a second side of the optical lens, and the light emitted by the light source is projected onto a first side of the optical lens after passing through the optical lens, forming an image or an illuminated area on the first side of the optical lens.

[0005] The first lens has a negative optical power and a convex shape facing the object side, which facilitates the collection of light from a wide field of view, increasing luminous flux. Light rays diffused from the first lens enter the second lens, which also has a negative optical power and a convex shape facing the object side, further diffusing the light rays and reducing the angle of incidence for a smoother transition. Light rays exiting the second lens then enter the third lens, a concave-convex negative optical power lens using a meniscus lens bent towards the first side to reduce the angle of incidence and avoid introducing significant spherical aberration and coma. Light rays exiting the third lens then enter the subsequent fourth, fifth, and sixth lenses. Each lens has a positive optical power and at least one convex side, which helps to smooth the light path through the remaining three lenses, reducing aberrations and coma. By controlling the focal length ratio of the front and rear lens groups within the range of -2.05 ≤ (F1+F2+F3) / (F4+F5+F6) ≤ -1.07, the refraction angles of the light from the front and rear groups can be balanced, preventing excessive tilting of light at the edges and ensuring uniform resolution from the center to the edge of the image. A ratio that is too small will result in excessive refractive power of the front lens group, leading to significant aberrations such as coma and field curvature. A ratio that is too large will prevent the front lens group from effectively diffusing light, resulting in a large incident angle of light entering the rear lens group and increased pressure on the rear phase correction. Attached Figure Description

[0006] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0007] Figures 1 to 14 Schematic diagrams of the optical lenses of Embodiments 1 to 14 of this application are shown;

[0008] Figure 15 A schematic diagram of the modulation transfer function (MTF) curve of the optical lens according to Embodiment 3 of this application is shown;

[0009] Figure 16 A schematic diagram of the modulation transfer function (MTF) curve of the optical lens according to Embodiment 5 of this application is shown;

[0010] Figure 17 A schematic diagram of the modulation transfer function (MTF) curve of an optical lens according to Embodiment 6 of this application is shown. Detailed Implementation

[0011] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0012] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0013] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0014] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0015] It should also be understood that the terms "comprising," "including," and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0016] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The features, principles, and other aspects of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] An optical lens according to an exemplary embodiment of this application may include, for example, six lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged sequentially from the first side to the second side along the optical axis.

[0019] In an exemplary embodiment, the optical lens provided in this application can be used as a light receiving lens or a light emitting lens, wherein: the light receiving lens is generally used to collect light from the object-side space, and the collected light is used to form detection information, including but not limited to imaging, laser point clouds, etc.; the light emitting lens is generally used to transmit light from the light emitting unit to the object-side space, and the light transmitted to the object-side space can be divided into projection light for forming a projected image, detection light for detecting target information, or illumination, etc., according to the function of the light.

[0020] It is understood that when the optical lens provided in this application is used as a light-receiving lens such as a camera lens, a lidar receiver lens, a microscope lens, or a telescope lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the image side (such as the side where a photoelectric sensor or retina is located). That is, light from the object side can be imaged or received on the image side, for example, a camera lens may be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc. When the optical lens provided in this application is used as a light-emitting lens such as a projection lens or a lidar transmitter lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the light source side.

[0021] In some possible implementations, the optical lens provided in this application can also simultaneously perform both light receiving and light transmitting functions. For example, the optical lens provided in this application is used in a lidar system with shared light and light paths, where the optical lens simultaneously performs the functions of emitting laser light and receiving radar echo beams. As another example, the optical lens provided in this application is used in a system integrating optical communication and lidar, where the optical lens simultaneously performs the functions of emitting modulated optical signals and receiving radar echo beams.

[0022] In an exemplary embodiment, the first lens has negative optical power, with a first convex side and a second concave side. The first lens is a negative optical power lens, and its shape is convex towards the object side, which facilitates the collection of light rays with a large field of view, increases luminous flux, and diffuses the light collected by the first lens to the rear of the first lens.

[0023] In an exemplary embodiment, the second lens has negative optical power, with its first side being convex and its second side being concave. The second lens is a negative optical power lens, and its shape convex towards the object side, which helps to further diffuse the light in front, reduce the light angle, and allow for a smoother light transition.

[0024] In an exemplary embodiment, the third lens has negative optical power, its first side is concave and its second side is convex. The third lens is a concave-convex negative optical power lens, using a meniscus lens that is bent towards the first side to reduce the incident angle of light and avoid introducing large spherical aberration and coma.

[0025] In an exemplary embodiment, the fourth lens has positive optical power, with its first side surface being concave and its second side surface being convex. This concave-convex positive optical power lens further converges light rays from the front, balances aberrations, and improves overall resolution.

[0026] In an exemplary embodiment, the fourth lens has positive optical power, with its first side surface being convex and its second side surface being concave. The fourth lens is a positive optical power lens with both convex and concave surfaces. The convex first side surface allows light to converge appropriately, which is beneficial for receiving light emitted from the third lens, further reducing the height of the light rays within the lens, and decreasing the aperture of the rear lens. The concave image side surface has a relatively gentle shape, which facilitates a smooth transition of light and initially corrects aberrations in the light incident on the fifth lens.

[0027] In an exemplary embodiment, the fourth lens has positive optical power, with its first side surface being convex and its second side surface being convex. The fourth lens is a convex-convex positive optical power lens, which facilitates the rapid convergence of light to the image plane. The fact that both the first and second sides are convex allows divergent light to be better converged to the rear optical lens, improving resolution.

[0028] In an exemplary embodiment, the fifth lens has positive optical power, its first side surface is convex, its second side surface is convex, and the fifth lens is a convex-convex positive optical power lens, which is conducive to the rapid convergence of light to the image plane. The first side surface and the second side surface are both convex, which can better converge the diverging light to the rear optical lens and improve the resolution.

[0029] In an exemplary embodiment, the fifth lens has positive optical power, with its first side surface being convex and its second side surface being concave. The fifth lens is a positive optical power lens with convex and concave surfaces. The convex first side surface allows light to converge appropriately, which is beneficial for receiving light emitted from the fourth lens, further reducing the height of the light in the lens, and reducing the aperture of the lens at the rear end. The concave second side surface has a relatively flat shape, which is beneficial for a smooth transition of light and initially corrects the aberration of the light incident on the sixth lens.

[0030] In an exemplary embodiment, the fifth lens has positive optical power, with a concave first side and a convex second side. The fifth lens is a concave-convex lens with positive optical power. The concave first side has a relatively gentle surface shape, which helps to smoothly transition light and reduce aberrations in the outgoing light. The convex second side allows for proper convergence of light, which helps to reduce the height of the outgoing light and thus the diameter of the rear lens.

[0031] In an exemplary embodiment, the sixth lens has positive optical power, with its first side surface being convex and its second side surface being convex. The sixth lens is a convex-convex positive optical power lens, which is beneficial for converging light rays and making the light path transition smoothly; it makes the light rays converge smoothly to the image plane, and works with the fifth lens to correct aberrations and improve image quality.

[0032] In an exemplary embodiment, the sixth lens has positive optical power, with its first side being concave and its second side being convex. The sixth lens is a concave-convex lens with positive optical power. The first side is concave, with a relatively gentle surface shape, which is conducive to a smooth transition of light. The second side is convex, which converges the light from the front, allowing the light to converge smoothly to the image plane.

[0033] In an exemplary embodiment, the optical lens may further include an aperture stop, which may be disposed, for example, between the third lens and the fourth lens. By placing an aperture stop between the third and fourth lenses, it is beneficial for light to transition smoothly to the rear of the system, reducing the aperture of the rear lens and decreasing the sensitivity of the optical lens during assembly. It should be understood that placing the aperture stop between the third and fourth lenses is merely exemplary, and this application does not impose specific limitations on it; the aperture stop may be placed in other positions as needed.

[0034] In an exemplary embodiment, the first and second sides of the sixth lens each have at least one inflection point. This arrangement allows edge rays to converge better onto the image plane, effectively reducing aberrations such as coma and field curvature, increasing the angle between the upper and lower rays in the edge field of view, and improving relative illumination.

[0035] In an exemplary embodiment, the first and second sides of the third lens, the first and second sides of the fourth lens, and the first and second sides of the sixth lens may have one or more aspherical surfaces, which can reasonably control the light deflection of each field of view, effectively reduce various aberrations such as spherical aberration, coma, and distortion, and improve the performance of the optical lens.

[0036] In an exemplary embodiment, the optical lens may further include a filter located between the sixth lens and the image plane to filter light of different wavelengths. The optical lens may also, as needed, have a protective glass between the filter and the image plane to prevent damage to internal components (e.g., chips) of the optical lens.

[0037] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a photocoupled device (CCD), a complementary metal oxide semiconductor device (CMOS), an avalanche photodiode detector (APD), a single-photon avalanche photodiode detector (SPAD), a silicon photomultiplier (SiPM), etc.

[0038] In an exemplary embodiment, the optical lens may further include a light source disposed on the second side. Optionally, the light source disposed on the second side may be an edge-emitting laser (EEL), a vertical-cavity surface-emitting laser (VCSEL), a fiber laser, an LED light source, a fluorescent laser light source, or a tri-color laser light source, etc.

[0039] In the various embodiments provided in this application, the parameters of the optical lens have the following meanings: FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, DMAX is the maximum aperture of the lens in the optical lens, D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, T56 is the distance between the fifth and sixth lenses on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the radius of curvature of the first side of the first lens, R7 is the radius of curvature of the first side of the fourth lens, and R8 is the radius of curvature of the second side of the fourth lens.

[0040] In an exemplary embodiment, the optical lens satisfies 47.85 ≤ (FOV×F) / H / 1° ≤ 84.27. Preferably, 56.30 ≤ (FOV×F) / H / 1° ≤ 73.28. By adjusting FOV, F, and H within this range, the light distribution in a wide-angle lens can be balanced, allowing the wide-angle light collected by the front negative power lens to be converged by the rear positive power lens, resulting in a complete and clear image on the image plane. This balances the integrity of the field of view coverage with imaging accuracy, improving the practical performance of the wide-angle system.

[0041] In an exemplary embodiment, the optical lens satisfies 6.03 ≤ TTL / F ≤ 12.21. Preferably, 7.093 ≤ TTL / F ≤ 10.62. By limiting the TTL / F within a reasonable range, it avoids insufficient spacing between the front and rear lens groups and congested optical paths due to an excessively short total optical length, allowing sufficient space to adjust the lens positions and prevent aberrations (such as distortion and coma) from becoming concentrated and difficult to correct. It also avoids an excessively long total length that would result in a bloated system, adapting to the miniaturization requirements of wide-angle lenses. Simultaneously, a reasonable ratio of positive and negative optical power lenses allows for coordinated space for optical power, ensuring a smooth transition of light from divergence to convergence in a wide field of view, improving the imaging quality of the edge field of view, and facilitating control of lens thickness and spacing parameters, reducing manufacturing and assembly difficulty, and balancing performance and structural compactness.

[0042] In an exemplary embodiment, the optical lens satisfies 0.013≤TTL / H / FOV×1°≤0.035. Preferably, 0.016≤TTL / H / FOV×1°≤0.030. With the same image height and field of view ratio, the length of the lens can be effectively limited. If the ratio is too large, the TTL will be relatively long, directly increasing the lens size and violating the miniaturization requirements of automotive equipment. If the ratio is too small, the TTL will be too short, leading to insufficient lens spacing. This results in a cramped optical path connection between the first three negative power lenses and the last three positive power lenses, necessitating increased lens thickness or complex curved surfaces to compensate for aberrations, indirectly increasing the size.

[0043] In an exemplary embodiment, the optical lens satisfies 1.07 ≤ TTL / DMAX ≤ 1.94. Preferably, 1.263 ≤ TTL / DMAX ≤ 1.682. If the ratio is too small, the TTL is too short and the DMAX is too large, making it difficult for the diverging rays from the first two negative power lenses to be effectively converged by the last three positive power lenses over short distances, easily causing off-axis aberrations (such as coma). If the ratio is too large, the TTL is too long, increasing the size, and the DMAX is too small, limiting the amount of light entering the lens and affecting the imaging effect. This range ensures that the DMAX is sufficient to receive light from a large field of view, while the TTL is compact enough to fit the vehicle space, making the optical path connection between the front and rear lens groups smooth, achieving a balance between size and performance while ensuring light intake and aberration correction.

[0044] In an exemplary embodiment, the optical lens satisfies 0.32 ≤ (F×θ) / D ≤ 0.78. Preferably, 0.38 ≤ (F×θ) / D ≤ 0.674. Controlling (F×θ) / D within this range ensures that D matches F and θ, allowing the first lens to fully receive light from a wide field of view while effectively controlling the lens's front aperture, thus meeting the requirements of lidar for a wide field of view and small size. If the ratio is too small, D will be too large, resulting in a larger lens size and affecting compatibility with the user end; if the ratio is too large, D will be too small, limiting the amount of light received and reducing the detection range of the radar lens.

[0045] In an exemplary embodiment, the optical lens satisfies 0 < D / H / FOV × 1° ≤ 0.021. Preferably, 0.01 ≤ D / H / FOV × 1° ≤ 0.018. This range allows D to be adapted to H and FOV, balancing beam utilization and structural practicality in wide-angle scenes, improving the imaging stability of the lens in different field-of-view areas. The lower limit ensures that the aperture of the first side S1 of the first lens L1 is not too small, avoiding the blocking of light rays at the edge of a large FOV due to insufficient diameter (reducing vignetting), ensuring uniform light intake in all areas of the image plane, and maintaining consistent image brightness. The upper limit restricts the excessive increase in the aperture of the first side S1 of the first lens L1, preventing the lens size from exceeding the standard (adapting to the needs of compact scenarios such as automotive), while reducing the processing difficulty and weight burden caused by a large diameter.

[0046] In an exemplary embodiment, the optical lens satisfies 0.40 ≤ D / H / F × 1mm ≤ 1.23. Preferably, 0.48 ≤ D / H / F × 1mm ≤ 1.065. This range coordinates the synergistic relationship between D, H, and F, balancing beam utilization and structural compactness in large field-of-view scenarios, and improving the imaging stability and engineering practicality of the lens under different operating conditions. When the aperture of the first side surface S1 of the first lens L1 is too small, it avoids the edge field-of-view light being blocked due to insufficient aperture of the first side surface S1 in large image height H (corresponding to a large field of view) or short focal length F scenarios (reducing vignetting), ensuring uniform light intake in all areas of the image plane, maintaining consistent image brightness, and especially adapting to the edge field-of-view requirements of large field-of-view lenses. An upper limit restricts the excessive increase of the aperture of the first side surface S1 of the first lens L1 to prevent the lens size from exceeding the limit.

[0047] In an exemplary embodiment, the optical lens satisfies 0 < |(HF×θ) / (F×θ)| ≤ 0.26. Preferably, 0.0002 ≤ |(HF×θ) / (F×θ)| ≤ 0.219. This range controls the relative deviation between the actual image height and the ideal image height, ensuring image realism and application reliability. The lower limit ensures the deviation is within a reasonable range, avoiding compatibility issues (such as mismatch with sensor characteristics) caused by the image height excessively approaching the ideal value, and ensuring coordinated imaging proportions in different areas of the image plane. The upper limit limits excessive deviation, preventing excessive deviation between the actual image height and the ideal value from causing imaging distortion (such as target size stretching or position shift), ensuring the accuracy of target shape and position restoration in large field-of-view scenes, meeting the accuracy requirements for scene detail capture and target recognition, and improving the lens's scene restoration capability in practical applications.

[0048] In an exemplary embodiment, the optical lens satisfies 0.09 ≤ BFL / TTL ≤ 0.22. Preferably, 0.108 ≤ BFL / TTL ≤ 0.191. The BFL to TTL ratio is reasonable, which avoids the BFL being too small, which would cause excessive power pressure on the last lens and thus lead to a large off-axis aberration, while also ensuring that the BFL is not too long, which would result in an excessively large overall lens size and thus a large space occupation in the vehicle.

[0049] In an exemplary embodiment, the optical lens satisfies 0.26 ≤ F / H ≤ 0.53. Preferably, 0.313 ≤ F / H ≤ 0.455. A reasonable ratio of F to H can reduce aberrations such as field curvature and astigmatism caused by an imbalance between focal length and image height. Especially at the edges of a large field of view, it allows for more uniform focusing accuracy of light in different areas of the image plane, improving overall image clarity. The lower limit ensures that F is not too small: avoiding excessive image stretching caused by a relatively large H (especially in large field-of-view scenes), preventing the target from being affected by proportional distortion on the image plane (such as misjudging object size), and maintaining the normal size relationship between near and far targets in the scene. The upper limit limits F from becoming excessively large: avoiding insufficient field of view coverage caused by a relatively small H, ensuring that light from the edges of a large field of view can be fully mapped onto the image plane, without wasting the effective area of ​​the sensor, and ensuring complete imaging of edge details in wide-angle scenes.

[0050] In an exemplary embodiment, the optical lens satisfies 0.85 ≤ F / ENPD ≤ 1.61. Preferably, 1.000 ≤ F / ENPD ≤ 1.400. Controlling the relationship between focal length and ENPD avoids insufficient light transmission, ensures sufficient image plane brightness in low-light environments, adapts to the complex lighting requirements of LiDAR, avoids excessively small F / ENPD (i.e., excessively large relative aperture), prevents a surge in spherical aberration and coma caused by a large aperture, and ensures image sharpness; the upper limit restricts an excessively large ratio (excessively small relative aperture).

[0051] In an exemplary embodiment, the optical lens satisfies 0.042 ≤ F / ENPD / D×1mm ≤ 0.094. Preferably, 0.050 ≤ F / ENPD / D×1mm ≤ 0.082. A reasonable ratio can coordinate the divergence and convergence rhythm of the light beam in the optical path, reduce aberrations (such as spherical aberration and coma) caused by the mismatch between ENPD, D, and F, and ensure clear and stable imaging of targets in both near and far blind zones in lidar operation, balancing optical performance and engineering practicality.

[0052] In an exemplary embodiment, the optical lens satisfies 0.67 ≤ T56 / F ≤ 2.49. Preferably, 0.792 ≤ T56 / F ≤ 2.159. By controlling the ratio of the distance between the fifth lens L5 and the sixth lens L6 on the optical axis to the total effective focal length of the optical lens within this range, the aberration correction effect and the TTL of the lens can be well balanced. If the two positive lenses are too close, there is insufficient space for off-axis ray correction, the light is quickly compressed, and astigmatism cannot be fully corrected. If the two lenses are too far apart, the light from the first lens is not received by the second lens in time, resulting in increased field curvature and an excessively long lens TTL, affecting assembly practicality.

[0053] In an exemplary embodiment, the optical lens satisfies 2.79 ≤ |F1 / F| ≤ 7.73. Preferably, 3.282 ≤ |F1 / F| ≤ 6.73. Adjusting the ratio of the focal length of the first lens L1 to the focal length of the lens within this range ensures that the divergence capability of the first element is moderate, which can fully receive light from a large field of view while avoiding excessive correction burden on the subsequent group. This ensures wide field of view coverage while helping to control aberrations and adapting to the performance and space requirements of the lidar. If the absolute value of the ratio is too small, the divergence capability of the first element is weak, making it difficult to capture light from the edge of a large field of view and limiting the detection range; if the absolute value is too large, the divergence is too strong, which will lead to excessive dispersion of light, easily causing distortion and coma, and increasing the aberration correction pressure on the subsequent group.

[0054] In an exemplary embodiment, the optical lens satisfies 2.12 ≤ |F2 / F| ≤ 6.90. Preferably, 2.504 ≤ |F2 / F| ≤ 5.998. Adjusting the ratio of the effective focal length of the second lens L2 to the total effective focal length of the optical lens within this range ensures that the second lens L2 has sufficient refractive power to further diverge the light emitted from the first lens L1, further reducing the angle of light incident on the rear lens group, so that the light transitions smoothly at the rear.

[0055] In an exemplary embodiment, the optical lens satisfies: 0.20 ≤ F2 / F3 ≤ 1.20. Preferably, 0.236 ≤ F2 / F3 ≤ 1.041. By adjusting this ratio within this range, the divergence capabilities of the second lens L2 and the third lens L3 are reasonably allocated, ensuring the lens's ability to receive light from a wide field of view while avoiding spherical aberration and coma caused by the excessively high optical power of the second lens L2, thus reducing the aberration correction pressure on the rear lens group.

[0056] In an exemplary embodiment, the optical lens satisfies -12.87 ≤ F3 / F ≤ -3.94. Preferably, -11.19 ≤ F3 / F ≤ -4.63. The third lens L3 is a transition lens between the front and rear optical power groups. Controlling F3 / F within this range can effectively compensate for the field distortion caused by the negative optical power lens group in the front group and improve the edge resolution of the image.

[0057] In an exemplary embodiment, the optical lens satisfies -3.76 ≤ F3 / F4 ≤ -0.85. Preferably, -3.265 ≤ F3 / F4 ≤ -1.006. The third lens L3 and the fourth lens L4 together serve as the transition optical path between the positive and negative optical powers of the front and rear groups. By controlling this ratio within this range, spherical aberration and coma generated by the negative optical power lens of the front group can be effectively compensated, while ensuring that the incident angle of light from the positive optical power lens of the rear group is reduced, thereby avoiding the pressure of rear aberration correction.

[0058] In an exemplary embodiment, the optical lens satisfies: 0.92 ≤ |R1 / F1| ≤ 2.90. Preferably, 1.087 ≤ |R1 / F1| ≤ 2.521. Controlling the curvature ratio of the first side surface S1 of the first lens L1 to the focal length within this range allows the first lens to efficiently guide light across a wide field of view, reducing aberrations while ensuring full field-of-view clarity and uniform light flux. If the curvature of the first side surface S1 of the first lens is too gentle, the light-gathering ability is weak, light rays at the edges of the wide field of view are easily diffused, exacerbating coma and astigmatism, and making edge vignetting more pronounced. If the curvature is too steep, the incident angle at the edge of the lens is large, which will introduce more off-axis aberrations and easily cause total internal reflection, resulting in vignetting at the edges.

[0059] In an exemplary embodiment, the optical lens satisfies: 2.46 ≤ F4 / F ≤ 6.69. Preferably, 2.896 ≤ F4 / F ≤ 5.816. By controlling the optical power of the fourth lens L4 to this range, the optical power of the fourth lens is ensured to be moderate, which can smoothly connect the optical paths of the third and fifth lenses, and can also work with the rear positive optical power lens to efficiently converge the diverging light from the front group, balancing aberration correction. If F4 is too small, the fourth lens will focus the light too strongly, which will easily lead to rapid convergence of light, aggravating spherical aberration and coma, and increasing the correction burden on the fifth lens; if F4 is too large, its focusing ability is insufficient, making it difficult to receive the light from the third lens and effectively guide it to the fifth lens, which may lead to optical path divergence and blurred imaging at the edges of a large field of view.

[0060] In an exemplary embodiment, the optical lens satisfies: 0.05 ≤ |R7 / R8| ≤ 7.53. Preferably, 0.062 ≤ |R7 / R8| ≤ 6.54. The fourth lens L4 is the lens that transitions between positive and negative optical power in the optical lens. If R7 / R8 is too small, the curvature difference between lens S1 and S2 is small, the positive optical power is weak, and it cannot effectively gather the diverging off-axis light rays transmitted from the front negative film, which will aggravate field curvature and astigmatism; if R7 / R8 is too large, the S2 surface is too steep, the light refraction changes abruptly, and coma is easily generated.

[0061] In an exemplary embodiment, the optical lens satisfies: 2.79 ≤ F5 / F ≤ 6.63. Preferably, 3.288 ≤ F5 / F ≤ 5.758. By controlling the L5 optical power to this range, the optical power of the fifth lens is ensured to be moderate. If the F5 is too small, the fifth lens will focus the light too strongly, which will easily lead to rapid convergence of light, aggravating spherical aberration and coma, and increasing the correction burden on the sixth lens. If the F5 is too large, its focusing ability is insufficient, making it difficult to receive the light from the fourth lens and effectively guide it to the sixth lens, which may lead to optical path divergence and blurred imaging at the edges of a large field of view.

[0062] In an exemplary embodiment, the optical lens satisfies: 2.22 ≤ F6 / F ≤ 4.26. Preferably, 2.612 ≤ F6 / F ≤ 3.705. By controlling this ratio within this range, the light-gathering ability of the sixth lens is ensured to be moderate, ensuring that the light is smoothly converged to the image plane, while also finely correcting residual aberrations, guaranteeing a flat image plane and clear imaging across the entire field of view, while also taking into account the compactness of the lens structure, perfectly adapting to the dual requirements of high image quality and space constraints of lidar.

[0063] In an exemplary embodiment, the optical lens satisfies: 0.85 ≤ F5 / F6 ≤ 2.11. Preferably, 1.005 ≤ F5 / F6 ≤ 1.833. By matching the focal length ratio of the last two positive power lenses within this range, the power distribution of the last two lenses is balanced, which can effectively correct coma, astigmatism, and other off-axis aberrations, improve the edge resolution of the lens, and at the same time avoid additional aberrations introduced by excessively large focal lengths of a single lens element.

[0064] In an exemplary embodiment, the optical lens satisfies -0.98 ≤ (1 / F1 + 1 / F2 + 1 / F3) / (1 / F4 + 1 / F5 + 1 / F6) ≤ -0.57. Preferably, -0.853 ≤ (1 / F1 + 1 / F2 + 1 / F3) / (1 / F4 + 1 / F5 + 1 / F6) ≤ -0.670. By controlling the ratio of the optical power of the front and rear lens groups within this range, the refraction angles of the light from the front and rear groups can be balanced, avoiding excessive tilting of edge light and ensuring uniform resolution from the center to the edge of the image. If the ratio is too small, the refractive power of the front lens will be too strong, resulting in large aberrations such as coma and field curvature in the front lens group. If the ratio is too large, the front lens group will not be able to effectively diffuse the light, resulting in a large incident angle of light entering the rear lens group and a large pressure on the rear phase correction.

[0065] In an exemplary embodiment, the optical lens satisfies -2.05 ≤ (F1+F2+F3) / (F4+F5+F6) ≤ -1.07. Preferably, -1.781 ≤ (F1+F2+F3) / (F4+F5+F6) ≤ -1.270. By controlling the focal length ratio of the front and rear lens groups within this range, the refraction angles of the light from the front and rear groups can be balanced, avoiding excessive tilting of edge light and ensuring uniform resolution from the center to the edge of the image. If the ratio is too small, the refractive power of the front lens will be too strong, resulting in large aberrations such as coma and field curvature in the front lens group. If the ratio is too large, the front lens group will not be able to effectively diffuse the light, resulting in a large incident angle of light entering the rear lens group and a large pressure on the rear phase correction.

[0066] The optical lens according to the above embodiments of this application can employ multiple lenses, such as the six lenses mentioned above. By rationally allocating the optical parameters of each lens, the optical lens achieves small aperture, miniaturization, high resolution, low sensitivity, large angular resolution, large field of view, long back focal length, low distortion, small principal angle, high illumination, and good manufacturability. It can also be well-matched to, for example, automotive chips without producing vignetting. This optical lens exhibits excellent temperature performance, with minimal changes in imaging effect at high and low temperatures, and stable image quality. Therefore, the optical lens according to the above embodiments of this application can better meet the requirements of, for example, automotive applications.

[0067] Those skilled in the art should understand that the total optical length (TTL) of the optical lens used above refers to the on-axis distance from the first side of the first lens to the imaging plane or image source plane; the back focal length (BFL) of the optical lens refers to the on-axis distance from the second side of the sixth lens to the imaging plane or image source plane; and the maximum field of view (FOV) of the optical lens is related to the image height (H), which refers to the field of view corresponding to the image height (H).

[0068] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the optical lens is not limited to including six lenses. If desired, the optical lens may also include other numbers of lenses.

[0069] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings. It should be understood that the units for the radius of curvature and thickness / distance in the basic parameters of the optical lens are mm.

[0070] Example 1

[0071] The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0072] like Figure 1 As shown, the optical lens, along the optical axis from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An aperture stop STO can be positioned between the third lens L3 and the fourth lens L4. The sixth lens L6 has at least one inflection point on its first side surface S11.

[0073] The first lens L1 has negative optical power, with its first side surface S1 being convex and its second side surface S2 being concave. The second lens L2 has negative optical power, with its first side surface S3 being convex and its second side surface S4 being concave. The third lens L3 has negative optical power, with its first side surface S6 being concave and its second side surface S7 being convex. The fourth lens L4 has positive optical power, with its first side surface S8 being concave and its second side surface S9 being convex. The fifth lens L5 has positive optical power, with its first side surface S10 being convex and its second side surface S11 being convex. The sixth lens L6 has positive optical power, with its first side surface S12 being convex and its second side surface S13 being convex.

[0074] An image plane (IMA) is provided on the second side of the optical lens. When the IMA is the imaging plane, light from the object passes through each surface sequentially and is finally imaged onto the IMA. When the IMA is the image source plane, light from the IMA passes through each surface sequentially and is finally projected onto the object. Table 1 shows the basic parameters of the optical lens of Embodiment 1.

[0075] Table 1

[0076]

[0077] In Embodiment 1, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0078] ;

[0079] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for the aspherical surfaces S12 and S13 in Example 1.

[0080] Table 2

[0081]

[0082] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.49 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 1 has good imaging quality.

[0083] Example 2

[0084] The following is for reference Figure 2 Describes an optical lens according to Embodiment 2 of this application. For example... Figure 2As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Table 3 shows the basic parameters of the optical lens of Embodiment 2.

[0085] Table 3

[0086]

[0087] In Embodiment 2, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 4 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S12 and S13 in Embodiment 2.

[0088] Table 4

[0089]

[0090] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.54 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 2 has good imaging quality.

[0091] Example 3

[0092] The following is for reference Figure 3 Describes an optical lens according to Embodiment 3 of this application. For example... Figure 3 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Table 5 shows the basic parameters of the optical lens of Embodiment 3.

[0093] Table 5

[0094]

[0095] In Example 3, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 6 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S12 and S13 in Example 3.

[0096] Table 6

[0097]

[0098] from Figure 15 As can be seen, the MTF value of the edge field of view of the optical lens of Example 3 exceeds 0.83 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens given in Example 3 has good imaging quality.

[0099] Example 4

[0100] The following is for reference Figure 4 Describes an optical lens according to Embodiment 4 of this application. For example... Figure 4 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second side surface S11 of the fifth lens L5 is concave; and the sixth lens L6 has at least one inflection point only on its second side surface S13. Table 7 shows the basic parameters of the optical lens of Embodiment 4.

[0101] Table 7

[0102]

[0103] In Example 4, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S12 and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 8 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S12 and S13 in Example 4.

[0104] Table 8

[0105]

[0106] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.55 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 4 has good imaging quality.

[0107] Example 5

[0108] The following is for reference Figure 5 Describes an optical lens according to Embodiment 5 of this application. For example... Figure 5 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Table 9 shows the basic parameters of the optical lens of Embodiment 5.

[0109] Table 9

[0110]

[0111] In Example 5, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 10 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S12 and S13 in Example 5.

[0112] Table 10

[0113]

[0114] from Figure 16 As can be seen, the MTF value of the edge field of view of the optical lens of Example 5 exceeds 0.65 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens given in Example 5 has good imaging quality.

[0115] Example 6

[0116] The following is for reference Figure 6 Describes an optical lens according to Embodiment 6 of this application. For example... Figure 6 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Table 11 shows the basic parameters of the optical lens of Embodiment 6.

[0117] Table 11

[0118]

[0119] In Example 6, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 12 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S12 and S13 in Example 6.

[0120] Table 12

[0121]

[0122] from Figure 17 As can be seen, the MTF value of the edge field of view of the optical lens of Example 6 exceeds 0.73 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens given in Example 6 has good imaging quality.

[0123] Example 7

[0124] The following is for reference Figure 7 Describes an optical lens according to Embodiment 7 of this application. For example... Figure 7 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; and the second side surface S11 of the fifth lens L5 is concave. Table 13 shows the basic parameters of the optical lens of Embodiment 7.

[0125] Table 13

[0126]

[0127] In Example 7, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 14 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10 and A12 of the aspherical surfaces S12 and S13 in Example 7.

[0128] Table 14

[0129]

[0130] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.61 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 7 has good imaging quality.

[0131] Example 8

[0132] The following is for reference Figure 8 Describes an optical lens according to Embodiment 8 of this application. For example... Figure 8 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the first side surface S10 of the fifth lens L5 is concave; and the first side surface S12 and the second side surface S13 of the sixth lens L6 each have at least one inflection point. Table 15 shows the basic parameters of the optical lens of Embodiment 8.

[0133] Table 15

[0134]

[0135] In Example 8, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S12 and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 16 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S5, S6, S12 and S13 in Example 8.

[0136] Table 16

[0137]

[0138] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.57 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 8 has good imaging quality.

[0139] Example 9

[0140] The following is for reference Figure 9 Describes an optical lens according to Embodiment 9 of this application. For example... Figure 9As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the first side surface S10 of the fifth lens L5 is concave, and the first side surface S12 of the sixth lens L6 is concave; the first side surface S12 and the second side surface S13 of the sixth lens L6 each have at least one inflection point. Table 17 is a basic parameter table of the optical lens of Embodiment 9.

[0141] Table 17

[0142]

[0143] In Example 9, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S12 and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 18 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S5, S6, S12 and S13 in Example 9.

[0144] Table 18

[0145]

[0146] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.62 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 9 has good imaging quality.

[0147] Example 10

[0148] The following is for reference Figure 10 Describes an optical lens according to Embodiment 10 of this application. For example... Figure 10 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; and the second side surface S10 of the fifth lens L5 is concave.

[0149] Table 19 shows the basic parameters of the optical lens of Example 10.

[0150] Table 19

[0151]

[0152] In Example 10, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 20 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical surface S12 and S13 in Example 10.

[0153] Table 20

[0154]

[0155] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.54 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 10 has good imaging quality.

[0156] Example 11

[0157] The following is for reference Figure 11 Describes an optical lens according to Embodiment 11 of this application. For example... Figure 11 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; and the first side surface S8 of the fourth lens L4 is convex. Table 21 shows the basic parameters of the optical lens of Embodiment 11.

[0158] Table 21

[0159]

[0160] In Example 11, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 22 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S12 and S13 in Example 11.

[0161] Table 22

[0162]

[0163] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.52 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 11 has good imaging quality.

[0164] Example 12

[0165] The following is for reference Figure 12 Describes an optical lens according to Embodiment 12 of this application. For example... Figure 12 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the first side surface S8 of the fourth lens L4 is convex, and the second side surface S9 of the fourth lens L4 is concave; the sixth lens L6 has at least one inflection point only on its second side surface S13. Table 23 shows the basic parameters of the optical lens of Embodiment 12.

[0166] Table 23

[0167]

[0168] In Example 12, the first side surface S8 and the second side surface S9 of the fourth lens L4, and the first side surface S12 and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 24 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S8, S9, S12 and S13 in Example 12.

[0169] Table 24

[0170]

[0171] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.48 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 12 has good imaging quality.

[0172] Example 13

[0173] The following is for reference Figure 13 Describes an optical lens according to Embodiment 13 of this application. For example... Figure 13 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; and the first side surface S8 of the fourth lens L4 is convex. Table 25 shows the basic parameters of the optical lens of Embodiment 13.

[0174] Table 25

[0175]

[0176] In Example 13, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 26 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S12 and S13 in Example 13.

[0177] Table 26

[0178]

[0179] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.60 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 13 has good imaging quality.

[0180] Example 14

[0181] The following is for reference Figure 14 Describes an optical lens according to Embodiment 14 of this application. For example... Figure 14As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; and the first side surface S8 of the fourth lens L4 is convex. Table 27 shows the basic parameters of the optical lens of Embodiment 14.

[0182] Table 27

[0183]

[0184] In Example 14, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 28 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S12 and S13 in Example 14.

[0185] Table 28

[0186]

[0187] In this embodiment, the MTF value of the edge field of view of the optical lens exceeds 0.67 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens provided in Embodiment 14 has good imaging quality.

[0188] Tables 29-1 and 29-2 provide the basic parameters of the optical lenses used in Examples 1-14. The unit for FOV in the tables is °, θ is a dimensionless parameter, and the units for other parameters are mm.

[0189] Table 29-1

[0190]

[0191] Table 29-2

[0192]

[0193] In summary, the relationships in each embodiment of Examples 1-14 satisfy the relationships shown in Tables 30-1 and 30-2.

[0194] Table 30-1

[0195]

[0196] Table 30-2

[0197]

[0198] This application also provides an electronic device including an optical lens as described in the exemplary embodiments above and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The imaging element is disposed on a second side of the optical lens, for example, on an imaging surface, and may be, for example, a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). Light from the first side is imaged on the second side after passing through the optical lens.

[0199] This application also provides an electronic device including an optical lens and a light source as described in the exemplary embodiments above, with the light source located on a second side of the optical lens. Light emitted from the light source is projected onto a first side of the optical lens after passing through it, forming an image or illuminating an area on the first side.

[0200] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens characterized in that, comprises, in order along the optical axis from the first side to the second side: a first lens with negative refractive power, a first side of the first lens being convex, a second side of the first lens being concave; a second lens with negative refractive power, a first side of the second lens being convex, a second side of the second lens being concave; a third lens with negative refractive power, a first side of the third lens being concave, a second side of the third lens being convex; a fourth lens with positive refractive power, at least one side of the fourth lens being convex; a fifth lens with positive refractive power, at least one side of the fifth lens being convex; a sixth lens with positive refractive power, at least one side of the sixth lens being convex; a number of lenses with refractive power in the optical lens is six; the optical lens satisfies: -2.05≤(F1+F2+F3) / (F4+F5+F6)≤-1.07, wherein F1 is an effective focal length of the first lens, F2 is an effective focal length of the second lens, F3 is an effective focal length of the third lens, F4 is an effective focal length of the fourth lens, F5 is an effective focal length of the fifth lens, and F6 is an effective focal length of the sixth lens.

2. The optical lens of claim 1, wherein, a first side of the fourth lens is concave, a second side of the fourth lens is convex; or, a first side of the fourth lens is convex, a second side of the fourth lens is convex; or, a first side of the fourth lens is convex, a second side of the fourth lens is concave; and / or, a first side of the fifth lens is concave, a second side of the fifth lens is convex; or, a first side of the fifth lens is convex, a second side of the fifth lens is convex; or, a first side of the fifth lens is convex, a second side of the fifth lens is concave; and / or, a first side of the sixth lens is concave, a second side of the sixth lens is convex; or, a first side of the sixth lens is convex, a second side of the sixth lens is convex.

3. The optical lens according to claim 1 or 2, characterized in that, the optical lens satisfies at least one of the following relationships: 47.85≤(FOV×F) / H / 1°≤84.27, 6.03≤TTL / F≤12.21, 0.013≤TTL / H / FOV×1°≤0.035, 1.073≤TTL / DMAX≤1.94, 0.32≤(F×θ) / D≤0.78, 0 Wherein, FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, DMAX is the maximum light aperture of the lens in the optical lens, θ is the radian value of the maximum field of view of the optical lens, D is the maximum light aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens.

4. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: 0.67≤T56 / F≤2.49; wherein, T56 is the distance between the fifth lens and the sixth lens on the optical axis, and F is the total effective focal length of the optical lens.

5. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: 2.79≤|F1 / F|≤7.73; wherein, F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens.

6. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: 2.12≤|F2 / F|≤6.90; wherein, F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical lens.

7. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: 0.20≤F2 / F3≤1.20; wherein, F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens.

8. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: -12.87≤F3 / F≤-3.94; wherein, F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens.

9. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: -3.76≤F3 / F4≤-0.85; wherein, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

10. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: 0.92≤|R1 / F1|≤2.90; wherein, R1 is the curvature radius of the first side of the first lens, and F1 is the effective focal length of the first lens.

11. The optical lens of claim 1 or 2, wherein, The optical lens satisfies: 2.46≤F4 / F≤6.69; wherein, F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the optical lens.

12. The optical lens of claims 1 or 2, wherein, The optical lens satisfies: 0.05≤|R7 / R8|≤7.53; wherein, R7 is the curvature radius of the first side of the fourth lens, and R8 is the curvature radius of the second side of the fourth lens.

13. The optical lens of claims 1 or 2, wherein, The optical lens satisfies: 2.79≤F5 / F≤6.63; wherein, F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens.

14. The optical lens of claims 1 or 2, wherein, The optical lens satisfies: 2.22≤F6 / F≤4.26; wherein, F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens.

15. The optical lens of claims 1 or 2, wherein, The optical lens satisfies: 0.85≤F5 / F6≤2.11; wherein, F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens.

16. The optical lens of claims 1 or 2, wherein, The optical lens satisfies: -0.98≤(1 / F1+1 / F2+1 / F3) / (1 / F4+1 / F5+1 / F6)≤-0.57; wherein, F1 is an effective focal length of the first lens, F2 is an effective focal length of the second lens, F3 is an effective focal length of the third lens, F4 is an effective focal length of the fourth lens, F5 is an effective focal length of the fifth lens, and F6 is an effective focal length of the sixth lens.

17. The optical lens of claims 1 or 2, wherein, The optical lens satisfies at least one of the following relationships: 56.30≤(FOVxF) / H / 1°≤73.28, 7.093≤TTL / F≤10.62, 0.016≤TTL / H / FOV / 1°≤0.030, 1.263≤TTL / DMAX≤1.682, 0.380≤(FxQ) / D≤0.674, 0.01≤D / H / FOVx1°≤0.018, 0.48≤D / H / Fx1mm≤1.065, 0.0002≤|(H-FxQ) / (FxQ)|≤0.219, 0.108≤BFL / TTL≤0.191, 0.313≤F / H≤0.455, 1.000≤F / ENPD≤1.400, 0.050≤F / ENPD / Dx1mm≤0.082, 0.792≤T56 / F≤2.159, 3.282≤|F1 / F|≤6.73, 2.504≤|F2 / F|≤5.998, 0.236≤F2 / F3≤1.041, -11.190≤F3 / F≤-4.63, -3.265≤F3 / F4≤-1.006, 1.087≤|R1 / F1|≤2.521, 2.896≤F4 / F≤5.816, 0.062≤|R7 / R8|≤6.54, 3.288≤F5 / F≤5.758, 2.612≤F6 / F≤3.705, 1.005≤F5 / F6≤1.833, -0.853≤(1 / F1+1 / F2+1 / F3) / (1 / F4+1 / F5+1 / F6)≤-0.670, -1.781≤(F1+F2+F3) / (F4+F5+F6)≤-1.270; Wherein, FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, DMAX is the maximum clear aperture of the lens in the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, T56 is the distance on the optical axis between the fifth lens and the sixth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the curvature radius of the first side of the first lens, R7 is the curvature radius of the first side of the fourth lens, and R8 is the curvature radius of the second side of the fourth lens.

18. An electronic device, comprising: Comprise: The optical lens according to any one of claims 1-17; And At least one of an imaging element and a light source; Wherein, the imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal; Wherein, the light source is located on the second side of the optical lens, the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and an image or an illuminated area is formed on the first side of the optical lens.

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