Optical lenses and electronic devices

Abstract

This invention provides an optical lens and an electronic device. The optical lens consists of six lenses, which, along the optical axis from the first side to the second side, sequentially include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the optical lens satisfies: -0.42 ≤ T56 / R10 ≤ -0.25, where T56 is the air gap between the fifth and sixth lenses on the optical axis, and R10 is the radius of curvature of the second side of the fifth lens. This invention solves the problem in existing optical lenses of the difficulty in simultaneously achieving a large field of view, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical lens and an electronic device. Background Technology

[0002] In recent years, with the development of technology, the demand for optical lenses in daily life has been increasing, and optical lenses are being applied in more and more scenarios. For example, in automotive autonomous driving assistance systems, the emerging autonomous driving technology places extremely high demands on the vehicle's ability to perceive its surroundings. LiDAR is a key device for detecting information around a vehicle, and the optical lens mounted on a LiDAR is a crucial component for this ability to perceive the surrounding environment.

[0003] With the rapid development of autonomous driving assistance systems in automobiles, the optical lenses used in LiDAR are evolving towards miniaturization and high performance. Simultaneously, as the safety requirements of these systems increase, higher collimation performance is typically required in optical lenses to ensure more accurate signal detection and maintain the concentration of laser energy. Currently, optical lenses often employ the addition of aspherical mirrors to guarantee collimation performance. However, these lenses are relatively large, costly, and have a large chief ray angle (CRA), which is detrimental to achieving properly collimated laser emission.

[0004] In other words, existing optical lenses suffer from the problem of not being able to simultaneously achieve a large field of view, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and an electronic device to solve the problem that existing optical lenses cannot simultaneously achieve a large field of view, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising six lenses, which sequentially include, from a first side to a second side along the optical axis: a first lens having negative optical power, a first side surface of the first lens being convex, and a second side surface of the first lens being concave; a second lens having negative optical power, a first side surface of the second lens being convex, and a second side surface of the second lens being concave; a third lens having negative optical power, a first side surface of the third lens being convex, and a second side surface of the third lens being concave; a fourth lens having positive optical power, a first side surface of the fourth lens being convex, and a second side surface of the fourth lens being convex; a fifth lens having positive optical power, a second side surface of the fifth lens being convex; and a sixth lens having positive optical power, a first side surface of the sixth lens being convex; the optical lens satisfies: -0.42≤T56 / R10≤-0.25, where T56 is the air gap between the fifth and sixth lenses on the optical axis, and R10 is the radius of curvature of the second side surface of the fifth lens.

[0007] Furthermore, the first side surface of the fifth lens is concave.

[0008] Furthermore, the first side surface of the fifth lens is convex.

[0009] Furthermore, the first side surface of the fifth lens is a plane.

[0010] Furthermore, the second side surface of the sixth lens is concave.

[0011] Furthermore, the second side surface of the sixth lens is convex.

[0012] Furthermore, the second side surface of the sixth lens is a plane.

[0013] Furthermore, the third and fourth lenses form a cemented lens.

[0014] Furthermore, the optical lens satisfies: 0.34≤F / H≤0.42, where F is the effective focal length of the optical lens and H is the image height corresponding to the maximum field of view of the optical lens.

[0015] Furthermore, the optical lens satisfies: -12≤F3 / F≤-5, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens.

[0016] Furthermore, the optical lens satisfies: 0.8≤(CT3+CT4) / F4≤1.3, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens.

[0017] Furthermore, the optical lens satisfies: 0.8≤F1 / F2≤1.4, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens.

[0018] Furthermore, the optical lens satisfies: -3.5≤F1 / F≤-2.3, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens.

[0019] Furthermore, the optical lens satisfies: -3.5≤F2 / F≤-2.3, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens.

[0020] Furthermore, the optical lens satisfies: 1.8≤F4 / F≤2.8, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens.

[0021] Furthermore, the optical lens satisfies: 2.2≤F34 / F≤5.5, where F34 is the combined focal length of the third and fourth lenses, and F is the effective focal length of the optical lens.

[0022] Furthermore, the optical lens satisfies: 3≤F5 / F≤10, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the optical lens.

[0023] Furthermore, the optical lens satisfies: 3.8≤F6 / F≤7, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the optical lens.

[0024] Furthermore, the optical lens satisfies: 2≤F6 / T56≤4.8, where F6 is the effective focal length of the sixth lens and T56 is the air gap between the fifth and sixth lenses on the optical axis.

[0025] Furthermore, the optical lens satisfies: 0.18≤d34 / F5≤0.65, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and F5 is the effective focal length of the fifth lens.

[0026] Furthermore, the optical lens satisfies: 3≤d34 / T45≤100, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and T45 is the air gap on the optical axis between the fourth lens and the fifth lens.

[0027] Furthermore, the optical lens satisfies at least one of the following relationships: 10≤TTL / F≤12, 0.02≤TTL / H / FOV≤0.03, 1.7≤TTL / DMAX≤2.2, 0.46≤(F×θ) / D≤0.57, 0.01≤D / H / FOV≤0.015, 0.9≤D / H / F≤1.1, 0.1≤BFL / TTL≤0.18, 0.13≤F / ENPD / D≤0.18, and 0.09≤(H / 2) / (F×t) an(θ / 2))≤0.12; where TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, DMAX is the maximum aperture of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, D is the aperture on 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.

[0028] Furthermore, the optical lens satisfies at least one of the following relationships: -1.8≤R8 / R7≤-0.8, 0.65≤F5 / F6≤1.85, -7.8≤R10 / F≤-3, 3.3≤R1 / R2≤5.5, -0.25≤SAG10 / (D10 / 2)≤-0.05, 0.14≤SAG11 / (D11 / 2)≤0.41, 0≤TAN(CRA)×BFL≤0.2, -1.6≤R5 / F2≤-0.75, and 4≤d34 / T45≤74; where R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R7 is the radius of curvature of the first side surface of the fourth lens, and R8 is the radius of curvature of the second side surface of the fourth lens. R10 is the radius of curvature of the second side surface of the fifth lens, F is the effective focal length of the optical lens, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, BFL is the optical back focal length of the optical lens, SAG10 is the sag of the second side surface of the fifth lens, SAG11 is the sag of the first side surface of the sixth lens, D10 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the fifth lens, D11 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the sixth lens, CRA is the incident angle of the principal ray of the maximum field of view of the optical lens on the imaging plane, d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and T45 is the air gap on the optical axis between the fourth lens and the fifth lens.

[0029] Furthermore, the optical lens satisfies at least one of the following relationships: 10.6≤TTL / F≤11.5, 0.023≤TTL / H / FOV≤0.026, 1.8≤TTL / DMAX≤2.1, 0.49≤(F×θ) / D≤0.55, 0.012≤D / H / FOV≤0.014, 0.94≤D / H / F≤1.05, 0.1 2≤BFL / TTL≤0.17, 0.35≤F / H≤0.4, 0.14≤F / ENPD / D≤0.17, 0.1≤(H / 2) / (F×tan(θ / 2) )≤0.11, -0.4≤T56 / R10≤-0.28, -11≤F3 / F≤-7, -1.55≤R8 / R7≤-0.95, 0.9≤(CT3+CT4 ) / F4≤1.2, 0.9≤F1 / F2≤1.3, -3.3≤F1 / F≤-2.5, -3.3≤F2 / F≤-2.5, 2≤F4 / F≤2.6, 3≤F34 / F≤5, 4.2≤F5 / F≤8.5, 4.5≤F6 / F≤6.2, 0.9≤F5 / F6≤1.7, 2.4≤F6 / T56≤4.1, -7≤R10 / F≤-3.5, 3.8≤R1 / R2≤5, -0.21≤SAG10 / (D10 / 2)≤-0.09, 0.19≤SAG11 / (D11 / 2)≤0.36, 0.01≤TAN(CRA)×BFL≤0.16, 0.25≤d34 / F5≤0.54, 5≤d34 / T45≤64 and -1.4≤R5 / F2≤-0.9; where FOV is the maximum field of view of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, CRA is the incident angle of the principal ray at the imaging plane of the maximum field of view of the optical lens, F is the effective focal length of the optical 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, F34 is the combined focal length of the third and fourth lenses, BFL is the optical back focal length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, DMAX is the maximum aperture of the optical lens, D is the aperture on the first side of the first lens corresponding to the maximum field of view of the optical lens, and D10 is the aperture on the second side of the fifth lens corresponding to the maximum field of view of the optical lens. The aperture corresponding to the large field of view is defined as follows: D11 is the aperture corresponding to the maximum field of view of the optical lens on the first side of the sixth lens; R1 is the radius of curvature of the first side of the first lens; R2 is the radius of curvature of the second side of the first lens; R5 is the radius of curvature of the first side of the third lens; R7 is the radius of curvature of the first side of the fourth lens; R8 is the radius of curvature of the second side of the fourth lens; R10 is the radius of curvature of the second side of the fifth lens; CT3 is the center thickness of the third lens on the optical axis; CT4 is the center thickness of the fourth lens on the optical axis; SAG10 is the sag of the second side of the fifth lens; SAG11 is the sag of the first side of the sixth lens; d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis; T45 is the air gap between the fourth and fifth lenses on the optical axis; T56 is the air gap between the fifth and sixth lenses on the optical axis.

[0030] According to another aspect of the present invention, an electronic device is provided, comprising the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0031] This application provides a six-element optical lens. The first, second, and third lenses are configured with negative optical power and convex-concave shapes, enabling the collection of light at large angles, ensuring sufficient light transmission, adjusting light path, and improving imaging performance at the edges of the field of view. The fourth lens is configured with positive optical power, and both its first and second sides are convex, allowing it to work with the first three lenses with negative optical power to correct aberrations. The fifth lens is configured with positive optical power and its second side is convex, further correcting aberrations while compressing the forward beam to ensure a small aperture for the sixth lens, which is beneficial for achieving a small CRA (Current Aspect Ratio). Setting the sixth lens with positive optical power and a convex first side further converges the light, contributing to a small CRA. Simultaneously, constraining T56 / R10 within the range of -0.42 to -0.25 ensures that the second side of the fifth lens is more convex, allowing forward light to converge quickly. Combined with a larger air gap between the fifth and sixth lenses, this ensures that the principal ray in each field of view is close to the corresponding image height at the intersection point of the first side of the sixth lens. Maintaining a large air gap ensures that the principal rays in each field of view are nearly parallel to the optical axis, thereby guaranteeing high receiving efficiency and image quality on the imaging surface. This ultimately results in a wide field of view, a small CRA (Cost Aspect Ratio), and high image quality for the optical lens. Especially for optical lenses used in lidar transmission, it enables high emission collimation performance, allowing the collimation of the optical lens to be less than 0.4°, meaning the average angle of deviation of all outgoing rays from the optical axis is less than 0.4°. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figures 1 to 14 Cross-sectional views of the optical lenses of Embodiments 1 to 14 of the present invention are shown respectively;

[0034] Figures 15 to 28 MTF curves of the optical lenses of Embodiments 1 to 14 of the present invention are shown respectively;

[0035] Figure 29 A light transmission diagram of the optical lens in Comparative Example 1 is shown;

[0036] Figure 30 The MTF curve of the optical lens in Comparative Example 1 is shown.

[0037] The above figures include the following reference numerals:

[0038] STO, Aperture Stop; L1, First Lens; S1, First Side of First Lens; S2, Second Side of First Lens; L2, Second Lens; S3, First Side of Second Lens; S4, Second Side of Second Lens; L3, Third Lens; S5, First Side of Third Lens; S6, Second Side of Third Lens; L4, Fourth Lens; S7, First Side of Fourth Lens; S8, Second Side of Fourth Lens; L5, Fifth Lens; S9, First Side of Fifth Lens; S10, Second Side of Fifth Lens; L6, Sixth Lens; S11, First Side of Sixth Lens; S12, Second Side of Sixth Lens; IMA, Imaging Surface. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0042] 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.

[0043] 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.

[0044] 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 object side is called the first side surface of the lens, and the surface of each lens closest to the image side is called the second side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0045] 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 element to the object-side space, and the light transmitted to the object-side space can be divided into projection light for forming a projection image or detection light for detecting target information, etc., according to the function of the light.

[0046] 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 closer to the photoelectric sensor or the retina), meaning that light from the object can form an image on the image side. Examples include camera lenses used in devices such as vehicle-mounted cameras, infrared cameras, drone cameras, night vision cameras, and security monitoring cameras. When the optical lens provided in this application is used 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.

[0047] 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 radar, where the optical lens simultaneously performs the functions of emitting modulated optical signals and receiving radar echo beams.

[0048] To address the challenges of simultaneously achieving a large field of view, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance in existing optical lenses, this invention provides an optical lens and an electronic device.

[0049] In some alternative embodiments, please refer to Figures 1 to 28 The optical lens consists of six lenses with optical power: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. These six lenses are arranged sequentially from the first side to the second side along the optical axis.

[0050] In some alternative embodiments, the first lens has negative optical power, a first side surface of the first lens is convex, and a second side surface of the first lens is concave. The first lens, being closest to the first side in the optical lens, is set to negative optical power, and its first side surface is convex. This facilitates beam convergence, reducing the diameter of the received beam and thus decreasing the size of the rear lens. Ultimately, this contributes to the miniaturization of the optical lens and reduces manufacturing costs. Simultaneously, the second side surface of the first lens is designed to be concave, making the first lens overall meniscus with the concave side facing the second side. This allows light to enter the rear optical system smoothly, thus mitigating the trajectory of edge rays and reducing the incident angle of the principal rays in each field of view, thereby improving the imaging quality of the optical lens.

[0051] In some alternative embodiments, the second lens has negative optical power, a first convex surface, and a second concave surface. The negative optical power and convex first surface of the second lens allow it to slightly converge the light beam diffused by the first lens, adjusting the light path and helping to reduce the aperture of subsequent third to sixth lenses, thus achieving cost reduction. Simultaneously, the concave second surface of the second lens, matching the shape of the first lens, ensures that both the first and second lenses are large-angle lenses, which facilitates light convergence in a wide-angle field of view, thereby adjusting the path of edge beams and ensuring the optical lens has a large field of view.

[0052] In some alternative embodiments, the third lens has negative optical power, a first convex surface, and a second concave surface. Setting the third lens to negative optical power and a convex first surface slightly converges the diffused light beams from the first and second lenses, smoothing the light path and thus alleviating the resolving pressure on the edge fields of view from the second surface of the third lens and the fourth to sixth lenses behind it. Setting the second surface of the third lens to be concave further adjusts and expands the light beam, ensuring that each field-of-view beam is incident on the fourth to sixth lenses with slight beam expansion, guaranteeing high imaging quality at the edge fields of view. Specifically, when the optical lens is applied to a lidar transmitter, the third lens provides high collimation performance over a large field of view.

[0053] In some alternative embodiments, the fourth lens has positive optical power, and both its first and second sides are convex. By setting the fourth lens to positive optical power, and ensuring that both its first and second sides are convex, optical power compensation is achieved with the first three lenses, which have negative optical power, thus achieving a balance in optical power. The design of the first, second, and third lenses having negative optical power helps to expand the field of view of the optical lens, while the fourth lens, with its first and second sides being convex, converges and focuses the beams diffused by the first three lenses with negative optical power, initiating the converging imaging process of the optical lens.

[0054] In some alternative embodiments, the third lens and the fourth lens are cemented together to form a cemented lens. The combination of the positive and negative optical powers of the fourth and third lenses can smoothly transition the light transmitted from the front to the rear optical system, allowing various aberrations in the optical lens to be fully corrected. In particular, it has a good adjustment effect on spherical aberration in the central field of view and coma in the large field of view, which is beneficial to improving the imaging quality of the optical lens. As an intermediate transition, the cemented lens can balance the optical power distribution of the front group, prevent the optical lens from being excessively elongated, and facilitate a more compact overall axial length. This aligns with the industry trend of miniaturization in LiDAR modules and is conducive to achieving excellent performance in large field of view emission and high collimation output.

[0055] In some alternative embodiments, the fifth lens has positive optical power, a concave first side surface, and a convex second side surface. Setting the fifth lens to positive optical power and having a concave first side surface smooths the light path, which is beneficial for correcting edge field-of-view aberrations and thus improving the imaging performance of the optical lens. Simultaneously, the convex second side surface of the fifth lens compresses the forward beam, ensuring a smaller aperture for the sixth lens and making the intersection point of the principal ray of each field of view with the first side surface of the sixth lens close to the corresponding image height, which is beneficial for achieving a small CRA (Collateral Recognition Aberration). Optionally, for optical lenses used in lidar transmission, the above design can significantly improve transmission collimation performance.

[0056] In some alternative embodiments, the fifth lens has positive optical power, and both its first and second sides are convex. Setting the fifth lens to positive optical power and cooperating with the fourth lens allows for a second convergence adjustment of the light beam, reducing the resolving pressure on the fourth lens. Simultaneously, the convexity of both sides of the fifth lens facilitates smooth convergence of the forward light beam, improving the imaging quality of the optical lens. This also reduces the aperture of the rear sixth lens, thus achieving miniaturization. Optionally, for optical lenses used in lidar emission, the above design achieves both high-quality collimation performance and the trend towards miniaturization.

[0057] In some alternative embodiments, the fifth lens has positive optical power, a first side surface that is planar, and a second side surface that is convex. Setting the fifth lens to positive optical power and having a planar first side surface smooths the light path while improving its manufacturability and reducing assembly difficulty. The convex second side surface of the fifth lens compresses the forward light beam, thereby ensuring a smaller aperture for the subsequent sixth lens and guaranteeing the miniaturization of the optical lens.

[0058] In some alternative embodiments, the sixth lens has positive optical power, a convex first side, and a concave second side. By setting the sixth lens to positive optical power and having a convex first side, it works in conjunction with the fourth and fifth lenses to effectively converge the already converging light beam a third time. The beam is then passed to the second side of the sixth lens for final resolution. The concave second side of the sixth lens creates a crescent shape facing the second side, effectively smoothing the path of light after passing through the fourth and fifth lenses, contributing to a small CRA (Cost Reduction Aspect) and high image quality in the optical lens.

[0059] In some alternative embodiments, the sixth lens has positive optical power, and both its first and second sides are convex. Setting the sixth lens to positive optical power and having both sides convex gives it strong positive refractive power, thereby effectively converging the light beam onto the imaging plane. Because the effective focal length of the sixth lens is relatively small, it complements the third, fourth, and fifth lenses in the preceding transition lens group, thus performing final aberration correction and ensuring high image quality from the optical lens.

[0060] In some alternative embodiments, the sixth lens has positive optical power, a convex first side, and a flat second side. By setting the sixth lens to positive optical power and having a convex first side, it works in conjunction with the preceding fourth and fifth lenses to further converge the light beam and transmit it to the second side for final resolution. The flat second side of the sixth lens helps to smooth the light path while reducing the sensitivity of the sixth lens, ensuring image quality.

[0061] In some optional embodiments, the optical lens satisfies: -0.42 ≤ T56 / R10 ≤ -0.25, where T56 is the air gap between the fifth and sixth lenses on the optical axis, and R10 is the radius of curvature of the second side surface of the fifth lens. By limiting -0.42 ≤ T56 / R10 ≤ -0.25, the second side surface of the fifth lens is made more convex, allowing the forward light rays to converge quickly after passing through the second side surface of the fifth lens. Combined with the larger air gap between the fifth and sixth lenses, this ensures that the principal ray of each field of view is close to the corresponding image height at the intersection point of the first side surface of the sixth lens. Maintaining a large air gap allows the principal rays of each field of view to be nearly parallel to the optical axis, thus ensuring high receiving efficiency and image quality of the imaging surface while limiting the size of the optical lens. Ultimately, this achieves a wide field of view, a small CRA (Collateral Radiation Aspect Ratio), and high image quality, allowing the collimation of the optical lens to be less than 0.4°, meaning the average angle of deviation of all outgoing rays from the optical axis is less than 0.4°. This is particularly beneficial for optical lenses used in lidar transmission, enabling high transmission collimation performance. Preferably, the optical lens can further satisfy -0.4≤T56 / R10≤-0.28, thereby achieving a wider field of view, a smaller CRA, and higher image quality. More preferably, the optical lens can further satisfy -0.3899≤T56 / R10≤-0.2896, thereby improving the imaging performance of the optical lens.

[0062] Optionally, the first and second lenses of the optical lens form a wide-angle focusing lens group, the third and fourth lenses form a transition lens group, and the fifth and sixth lenses serve as an imaging lens group.

[0063] In some alternative embodiments, the optical lens also has an aperture stop located between the second lens and the third lens. Positioning the aperture stop between the second and third lenses helps to effectively concentrate the light entering the optical lens, thereby reducing the lens aperture at the rear end of the optical lens and lowering the assembly sensitivity of the optical lens.

[0064] In some optional embodiments, the optical lens satisfies: 0.34 ≤ F / H ≤ 0.42, where F is the effective focal length of the optical lens and H is the image height corresponding to the maximum field of view of the optical lens. By limiting 0.34 ≤ F / H ≤ 0.42, the effective focal length and image height of the optical lens are controlled within a certain range, which is beneficial to improving the imaging quality of the optical lens. Preferably, the optical lens may further satisfy 0.35 ≤ F / H ≤ 0.4, which is beneficial to further improving the resolution of the optical lens. More preferably, the optical lens may further satisfy 0.3759 ≤ F / H ≤ 0.3843, which is beneficial to further improving the imaging quality of the optical lens.

[0065] In some optional embodiments, the optical lens satisfies: -12 ≤ F3 / F ≤ -5, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens. By limiting -12 ≤ F3 / F ≤ -5, it is known that the effective focal length of the third lens is relatively large. On the one hand, this allows for adjustment of the incident angle of the large field-of-view light transmitted by the lens with negative focal length in front, thereby ensuring that the fourth to sixth lenses behind have small apertures, which is beneficial for compressing the size of the optical lens and reducing material costs. On the other hand, it allows for aberration balance adjustment of the large field-of-view light gathered by the first and second lenses with negative optical power, especially adjusting the coma of the large field of view, ultimately achieving high imaging quality of the optical lens. Preferably, the optical lens can further satisfy -11 ≤ F3 / F ≤ -7, further reducing the size and aberrations of the optical lens. More preferably, the optical lens can further satisfy -10.6537 ≤ F3 / F ≤ -7.4994, which is beneficial for improving the imaging quality of the optical lens and reducing its size.

[0066] In some optional embodiments, the optical lens satisfies: 2.2 ≤ F34 / F ≤ 5.5, where F34 is the combined focal length of the third and fourth lenses, and F is the effective focal length of the optical lens. By limiting 2.2 ≤ F34 / F ≤ 5.5, the third and fourth lenses are cemented lenses, serving as an intermediate combination in the optical lens system and playing a crucial transitional role. Maintaining the ratio of the combined focal length of the third and fourth lenses to the effective focal length of the optical lens within a certain range effectively corrects aberrations introduced by the first and second lenses. In particular, it has a good adjustment effect on spherical aberration in the central field of view and coma in the large field of view, ultimately ensuring high imaging quality of the optical lens. Preferably, the optical lens can further satisfy 3 ≤ F34 / F ≤ 5 to further reduce aberrations. More preferably, the optical lens can further satisfy 3.2387 ≤ F34 / F ≤ 4.7634, which is beneficial for improving the imaging quality of the optical lens.

[0067] In some optional embodiments, the optical lens satisfies: 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens. By limiting 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, the cemented lens formed by the cementing of the third and fourth lenses serves as an intermediate transition lens, resulting in a thicker intermediate transition lens and a smaller effective focal length of the fourth lens. This balances the optical power distribution of the front and rear optical systems, preventing excessive elongation of the optical lens and achieving a smaller overall length, thus realizing miniaturization. Preferably, the optical lens can further satisfy 0.9 ≤ (CT3 + CT4) / F4 ≤ 1.2, further reducing the size of the optical lens. More preferably, the optical lens can further satisfy 0.9496 ≤ (CT3 + CT4) / F4 ≤ 1.1678, further reducing the size of the optical lens.

[0068] In some optional embodiments, the optical lens satisfies: 2.2≤F34 / F≤5.5, 0.8≤(CT3+CT4) / F4≤1.3, where F34 is the combined focal length of the third and fourth lenses, F is the effective focal length of the optical lens, CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens. This setting helps to simultaneously ensure excellent imaging performance and miniaturization requirements of the optical lens. In particular, when the optical lens used in the LiDAR module satisfies 0.8≤(CT3+CT4) / F4≤1.3 and 2.2≤F34 / F≤5.5, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens can further satisfy 3≤F34 / F≤5 and 0.9≤(CT3+CT4) / F4≤1.2 to further reduce the aberrations and size of the optical lens. More preferably, the optical lens can further satisfy 3.2387≤F34 / F≤4.7634 and 0.9496≤(CT3+CT4) / F4≤1.1678, which is beneficial to improving the imaging quality of the optical lens and at the same time allows the size of the optical lens to be further reduced.

[0069] In some optional embodiments, the optical lens satisfies: 0.8 ≤ F1 / F2 ≤ 1.4, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens. By limiting 0.8 ≤ F1 / F2 ≤ 1.4, both the first and second lenses are negative lenses with similar focal lengths. This combination of negative focal lengths allows for rapid light collection and adjustment of the large field-of-view beam at the front of the optical lens, ensuring that subsequent lenses such as the third lens have a smaller aperture, while simultaneously achieving both a large field-of-view characteristic and a small size advantage. Preferably, the optical lens can further satisfy 0.9 ≤ F1 / F2 ≤ 1.3 to guarantee both a large field-of-view characteristic and a small size advantage. More preferably, the optical lens can further satisfy 0.9495 ≤ F1 / F2 ≤ 1.2554, which is beneficial for achieving miniaturization while satisfying a large field-of-view characteristic.

[0070] In some optional embodiments, the optical lens satisfies: -3.5 ≤ F1 / F ≤ -2.3, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens. By limiting -3.5 ≤ F1 / F ≤ -2.3, the first lens receives light rays incident at large angles into the optical lens, expanding the field of view of the optical lens, and also helping to reduce the sensitivity of the optical lens, thus achieving a miniaturized design of the optical lens. Preferably, the optical lens may further satisfy -3.3 ≤ F1 / F ≤ -2.5, which is beneficial for expanding the field of view and reducing sensitivity. More preferably, the optical lens may further satisfy -3.2611 ≤ F1 / F ≤ -2.7062, further expanding the field of view.

[0071] In some optional embodiments, the optical lens satisfies: -3.5 ≤ F2 / F ≤ -2.3, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens. By limiting -3.5 ≤ F2 / F ≤ -2.3, the second lens has a negative focal length and a relatively small focal length, which allows for a second adjustment of the full-field-of-view beam, a second deflection of the large-field-of-view beam, and redirection of the beam towards the transition lens group, thereby facilitating the realization of a large field of view for the optical lens. Preferably, the optical lens may further satisfy -3.3 ≤ F2 / F ≤ -2.5, which facilitates further adjustment of the light path and increases the field of view. More preferably, the optical lens may further satisfy -3.2310 ≤ F2 / F ≤ -2.5977, further achieving a large field of view for the optical lens.

[0072] In one optional embodiment, the optical lens satisfies: 1.8 ≤ F4 / F ≤ 2.8, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens. By limiting 1.8 ≤ F4 / F ≤ 2.8, the fourth lens is a positive lens, and its effective focal length is relatively small. As part of the transition lens group of the optical lens, the fourth lens plays a crucial role in transmitting the light beam to the final imaging lens group, achieving aberration complementarity with the preceding and following optical systems, thereby achieving high imaging quality. Preferably, the optical lens can further satisfy 2 ≤ F4 / F ≤ 2.6 to improve the imaging quality. More preferably, the optical lens can further satisfy 2.0681 ≤ F4 / F ≤ 2.5253 to further improve the imaging quality.

[0073] In one optional embodiment, the optical lens satisfies: 3 ≤ F5 / F ≤ 10, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the optical lens. By limiting 3 ≤ F5 / F ≤ 10, the fifth lens is a positive lens, and its effective focal length is relatively large. As part of the imaging lens group, the fifth lens initially converges the light beams from the front wide-angle convergent lens group and the transition lens group, ensuring that the effective focal length of the fifth lens is within a certain range. This helps control the degree of light convergence and improves the imaging quality of the optical lens. Preferably, the optical lens can further satisfy 4.2 ≤ F5 / F ≤ 8.5, which further improves the imaging quality. More preferably, the optical lens can further satisfy 4.4865 ≤ F5 / F ≤ 8.2400, further improving the imaging quality.

[0074] In one optional embodiment, the optical lens satisfies: 3.8 ≤ F6 / F ≤ 7, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the optical lens. By limiting 3.8 ≤ F6 / F ≤ 7, the sixth lens is a positive lens, and its effective focal length is relatively large. As part of the imaging lens group, the sixth lens performs the final imaging of the beam initially converged by the fifth lens, ensuring that the effective focal length of the sixth lens is within a certain range, which is beneficial for achieving high imaging quality. Preferably, the optical lens can further satisfy 4.5 ≤ F6 / F ≤ 6.2, which is beneficial for improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 4.5334 ≤ F6 / F ≤ 6.1544, which further improves the imaging quality of the optical lens.

[0075] In one optional embodiment, the optical lens satisfies: 2≤F6 / T56≤4.8, where F6 is the effective focal length of the sixth lens, and T56 is the air gap between the fifth and sixth lenses on the optical axis. By limiting 2≤F6 / T56≤4.8, the air gap between the fifth and sixth lenses is appropriately lengthened, and the effective focal length of the sixth lens is controlled. This facilitates the smooth convergence of light from the second side of the fifth lens to the first side of the sixth lens, reducing the pressure on the sixth lens to correct aberrations, allowing light to converge smoothly onto the imaging plane, improving image quality, and simultaneously ensuring the miniaturization of the optical lens design. Preferably, the optical lens can further satisfy 2.4≤F6 / T56≤4.1, which helps to reduce the overall optical length while improving image quality. More preferably, the optical lens can further satisfy 2.4238≤F6 / T56≤4.0819, further reducing the overall optical length while improving image quality.

[0076] In one optional embodiment, the optical lens satisfies: 0.18 ≤ d34 / F5 ≤ 0.65, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and F5 is the effective focal length of the fifth lens. By limiting 0.18 ≤ d34 / F5 ≤ 0.65 and appropriately increasing the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, the distribution of optical power at the front and rear of the optical lens can be balanced, preventing the optical lens from being excessively elongated, thereby achieving a smaller overall length of the optical lens, miniaturization, and reasonable control of the effective focal length of the fifth lens, which is conducive to the smooth convergence of light onto the imaging plane and improves the imaging quality of the optical lens. In particular, when the optical lens is applied to a lidar module, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens can further satisfy 0.25 ≤ d34 / F5 ≤ 0.54, which is beneficial to reducing the overall optical length while improving the imaging quality. More preferably, the optical lens can further satisfy 0.2551 ≤ d34 / F5 ≤ 0.5379, further reducing the overall optical length while improving the imaging quality.

[0077] In one optional embodiment, the optical lens satisfies: 3 ≤ d34 / T45 ≤ 100, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and T45 is the air gap on the optical axis between the fourth lens and the fifth lens. By limiting 3 ≤ d34 / T45 ≤ 100, the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens is appropriately increased, and the air gap between the fourth lens and the fifth lens is made smaller. This balances the front-to-back optical power distribution of the optical lens, which is beneficial for achieving both high imaging quality and miniaturization. In particular, when the optical lens is applied to a lidar module, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens can further satisfy 4 ≤ d34 / T45 ≤ 74, which is beneficial for reducing the total optical length while achieving high imaging quality. More preferably, the optical lens further satisfies 5 ≤ ​​d34 / T45 ≤ 64, which further reduces the total optical length while achieving high imaging quality. Ideally, the optical lens can satisfy 5.4588≤d34 / T45≤63.3970, enabling the optical lens to achieve both high imaging quality and miniaturization.

[0078] In one optional embodiment, the optical lens satisfies: 10 ≤ TTL / F ≤ 12; where TTL is the total optical length of the optical lens and F is the effective focal length of the optical lens. Limiting the optical lens to 10 ≤ TTL / F ≤ 12 helps reduce its total optical length, thus miniaturizing it. Preferably, the optical lens further satisfies 10.6 ≤ TTL / F ≤ 11.5, which further reduces its total optical length and achieves miniaturization. More preferably, the optical lens further satisfies 10.6595 ≤ TTL / F ≤ 11.4757, which further reduces its size.

[0079] In one optional embodiment, the optical lens satisfies: 0.02 ≤ TTL / H / FOV ≤ 0.03; where TTL is the total optical length of the optical lens, FOV is the maximum field of view of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. By limiting 0.02 ≤ TTL / H / FOV ≤ 0.03, it is beneficial to reduce the total optical length of the optical lens while maintaining the field of view, which is beneficial to miniaturization of the optical lens. Preferably, the optical lens can further satisfy 0.023 ≤ TTL / H / FOV ≤ 0.026, which is beneficial to reducing the total optical length and miniaturization of the optical lens. More preferably, the optical lens can further satisfy 0.0236 ≤ TTL / H / FOV ≤ 0.0256, which is beneficial to further reduce the size of the optical lens.

[0080] In one optional embodiment, the optical lens satisfies: 1.7 ≤ TTL / DMAX ≤ 2.2; where TTL is the total optical length of the optical lens, and DMAX is the maximum aperture of the optical lens. By limiting 1.7 ≤ TTL / DMAX ≤ 2.2, it is beneficial to reduce the total optical length of the optical lens while ensuring that the maximum aperture of the optical lens is within a reasonable range, which is conducive to a more compact optical lens. Preferably, the optical lens can further satisfy 1.8 ≤ TTL / DMAX ≤ 2.1, which is beneficial to miniaturization of the optical lens. More preferably, the optical lens can further satisfy 1.8006 ≤ TTL / DMAX ≤ 2.0527, which is beneficial to miniaturization of the optical lens.

[0081] In one optional embodiment, the optical lens satisfies: 0.46 ≤ (F × θ) / D ≤ 0.57; where F is the effective focal length of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, and D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens. By limiting 0.46 ≤ (F × θ) / D ≤ 0.57, the front aperture of the optical lens can be made smaller, reducing the size of the optical lens. Preferably, the optical lens can further satisfy 0.49 ≤ (F × θ) / D ≤ 0.55, which is beneficial for miniaturizing the optical lens. More preferably, the optical lens can further satisfy 0.4947 ≤ (F × θ) / D ≤ 0.5459, which is beneficial for further reducing the size of the optical lens.

[0082] In one optional embodiment, the optical lens satisfies: 0.01 ≤ D / H / FOV ≤ 0.015; where FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens. By limiting 0.01 ≤ D / H / FOV ≤ 0.015, the front aperture is small, enabling miniaturization. Preferably, the optical lens can further satisfy 0.012 ≤ D / H / FOV ≤ 0.014, which is beneficial for miniaturization of the optical lens. More preferably, the optical lens can further satisfy 0.0122 ≤ D / H / FOV ≤ 0.0133, which is beneficial for further reducing the size of the optical lens.

[0083] In one optional embodiment, the optical lens satisfies: 0.9 ≤ D / H / F ≤ 1.1; where F is the effective focal length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens. By limiting 0.9 ≤ D / H / F ≤ 1.1, under the condition of a fixed focal length, the optical lens can be provided with the characteristics of a large imaging surface and a small front aperture. Preferably, the optical lens can further satisfy 0.94 ≤ D / H / F ≤ 1.05, which is beneficial to further reduce the front aperture and facilitates miniaturization. More preferably, the optical lens can further satisfy 0.9466 ≤ D / H / F ≤ 1.0418, which is beneficial to further reduce the front aperture and facilitates miniaturization.

[0084] In one optional embodiment, the optical lens satisfies: 0.1 ≤ BFL / TTL ≤ 0.18; where TTL is the total optical length of the optical lens, and BFL is the optical back focal length of the optical lens. By limiting 0.1 ≤ BFL / TTL ≤ 0.18, the back focal length of the optical lens is reasonably controlled, which on the one hand allows for a smaller incident angle of the principal ray on the imaging plane, and simultaneously achieves miniaturization of the optical lens; on the other hand, it leaves sufficient space for the external module. Preferably, the optical lens can further satisfy 0.12 ≤ BFL / TTL ≤ 0.17, balancing the volume and space of the optical lens, which is beneficial for miniaturization. More preferably, the optical lens can further satisfy 0.1211 ≤ BFL / TTL ≤ 0.1648, further balancing the volume and space of the optical lens, which is beneficial for miniaturization.

[0085] In one optional embodiment, the optical lens satisfies: 0.13 ≤ F / ENPD / D ≤ 0.18; where F is the effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, and D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens. By limiting 0.13 ≤ F / ENPD / D ≤ 0.18, a small aperture is ensured while meeting the requirement of high-energy laser emission, thus achieving miniaturization of the optical lens. Preferably, the optical lens can further satisfy 0.14 ≤ F / ENPD / D ≤ 0.17, which is beneficial for miniaturization. More preferably, the optical lens can further satisfy 0.1498 ≤ F / ENPD / D ≤ 0.1624, which is beneficial for miniaturization.

[0086] In one optional embodiment, the optical lens satisfies: 0.09 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.12; where H is the image height corresponding to the maximum field of view of the optical lens, F is the effective focal length of the optical lens, and θ is the radian value corresponding to the maximum field of view of the optical lens. By limiting 0.09 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.12, the ratio of the actual image height to the ideal image height is reflected, controlling the optical distortion of the optical lens, which is beneficial for achieving a wide field of view. Preferably, the optical lens can further satisfy 0.1 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.11, which is beneficial for achieving a large field of view and high imaging quality. More preferably, the optical lens can further satisfy 0.1070 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.1094, which is beneficial for further ensuring a large field of view and high imaging quality.

[0087] In one optional embodiment, the optical lens satisfies: -1.8 ≤ R8 / R7 ≤ -0.8; where R7 is the radius of curvature of the first side surface of the fourth lens, and R8 is the radius of curvature of the second side surface of the fourth lens. By limiting -1.8 ≤ R8 / R7 ≤ -0.8, both the first and second sides of the fourth lens are convex surfaces, and their curvature is close to or equal, providing higher positive refractive power and undertaking the main converging task. This allows for positive power compensation with the front-end optical system, resulting in superior imaging performance. It also avoids excessive refraction of light rays after passing through the first and second sides of the fourth lens, thus improving image quality. Preferably, the optical lens can further satisfy -1.55 ≤ R8 / R7 ≤ -0.95, which helps optimize the light path through the optical lens and improve image quality. More preferably, the optical lens can further satisfy -1.6035 ≤ R8 / R7 ≤ -0.9963, which further improves the image quality of the optical lens.

[0088] In one optional embodiment, the optical lens satisfies: 0.65 ≤ F5 / F6 ≤ 1.85; where F5 is the effective focal length of the fifth lens and F6 is the effective focal length of the sixth lens. By limiting 0.65 ≤ F5 / F6 ≤ 1.85, both the fifth and sixth lenses are positive lenses with similar focal lengths, playing a decisive role as the imaging group of the optical lens. The close ratio of the effective focal lengths of the fifth and sixth lenses, maintained within a certain range, allows for further compensation and adjustment of the optical lens aberrations, ultimately resulting in image formation and achieving high imaging performance. Preferably, the optical lens can further satisfy 0.9 ≤ F5 / F6 ≤ 1.7, which is beneficial for further reducing optical lens aberrations and improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 0.9376 ≤ F5 / F6 ≤ 1.6754, which is beneficial for further improving the imaging quality of the optical lens.

[0089] In one optional embodiment, the optical lens satisfies: -7.8 ≤ R10 / F ≤ -3; where R10 is the radius of curvature of the second side surface of the fifth lens, and F is the effective focal length of the optical lens. By limiting -7.8 ≤ R10 / F ≤ -3, the second side surface of the fifth lens is more convex, and the light rays in front converge quickly after passing through the second side surface of the fifth lens, which is beneficial for reducing the aperture of the sixth lens. Preferably, the optical lens can further satisfy -7 ≤ R10 / F ≤ -3.5, reducing the aperture of the sixth lens and facilitating the miniaturization of the optical lens. More preferably, the optical lens can further satisfy -6.7249 ≤ R10 / F ≤ -3.8045, further reducing the aperture of the sixth lens and facilitating the miniaturization of the optical lens.

[0090] In one optional embodiment, the optical lens satisfies: 2≤F6 / T56≤4.8, -7.8≤R10 / F≤-3; where R10 is the radius of curvature of the second side surface of the fifth lens, F is the effective focal length of the optical lens, F6 is the effective focal length of the sixth lens, and T56 is the air gap between the fifth and sixth lenses on the optical axis. The combination of R10 / F and F6 / T56, through the design of a relatively convex second side surface of the fifth lens, an air gap between the fifth and sixth lenses, and a relatively long effective focal length of the sixth lens, ensures that the principal rays of each field of view passing through the fifth lens are nearly parallel to the optical axis. This guarantees high receiving efficiency and imaging quality for the imaging chip, thereby enabling the optical lens to simultaneously achieve a wide field of view, a small CRA (Collateral Radiation Aspect Ratio), and high imaging quality. In particular, when the optical lens is applied to a lidar transmitting lens, it can achieve high transmission collimation performance. Preferably, the optical lens can further satisfy 0.9≤F5 / F6≤1.7 and -7≤R10 / F≤-3.5, which is beneficial for further reducing the aberrations and aperture of the optical lens, ensuring miniaturization while improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 0.9376≤F5 / F6≤1.6754 and -6.7249≤R10 / F≤-3.8045, which is beneficial for further improving the imaging quality of the optical lens and ensuring miniaturization.

[0091] In one optional embodiment, the optical lens satisfies: 3.3 ≤ R1 / R2 ≤ 5.5; where R1 is the radius of curvature of the first side surface of the first lens, and R2 is the radius of curvature of the second side surface of the first lens. By limiting 3.3 ≤ R1 / R2 ≤ 5.5, the first lens has a meniscus shape with its concave surface facing the second side, and the radius of curvature of the first side surface of the first lens is greater than the radius of curvature of the second side surface, which is beneficial for beam collection in a wide-angle field of view, thus achieving a large field of view for the optical lens. Preferably, the optical lens may further satisfy 3.8 ≤ R1 / R2 ≤ 5, which is beneficial for improving the field of view of the optical lens. More preferably, the optical lens may further satisfy 3.8151 ≤ R1 / R2 ≤ 4.9320, which is beneficial for further increasing the field of view of the optical lens.

[0092] In one optional embodiment, the optical lens satisfies: -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05; where SAG10 is the sag of the second side surface of the fifth lens, and D10 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the fifth lens. By limiting -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05, the sag and aperture of the second side surface of the fifth lens are reasonably controlled, compressing the forward beam and thus ensuring a smaller aperture for the sixth lens, which is beneficial for miniaturizing the optical lens. Preferably, the optical lens can further satisfy -0.21 ≤ SAG10 / (D10 / 2) ≤ -0.09, which is beneficial for further miniaturizing the optical lens. More preferably, the optical lens can further satisfy -0.2085 ≤ SAG10 / (D10 / 2) ≤ -0.0966, which is beneficial for further miniaturizing the optical lens.

[0093] In one optional embodiment, the optical lens satisfies: 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41; where SAG11 is the sag of the first side surface of the sixth lens, and D11 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the sixth lens. By limiting 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41, the sag and aperture of the first side surface of the sixth lens are reasonably controlled, the beam trend is controlled, and the final imaging is performed, ensuring that the subtended angle of the sixth lens is within a certain range. This is beneficial for the optical lens to achieve high resolution and high imaging quality. Preferably, the optical lens can further satisfy 0.19 ≤ SAG11 / (D11 / 2) ≤ 0.36 to achieve high resolution and further improve the imaging quality. More preferably, the optical lens can further satisfy 0.1936 ≤ SAG11 / (D11 / 2) ≤ 0.3518, which is beneficial for further improving the imaging quality.

[0094] In one optional embodiment, the optical lens satisfies: 0 ≤ TAN(CRA) × BFL ≤ 0.2; where CRA is the incident angle of the principal ray at the imaging plane in the maximum field of view of the optical lens, and BFL is the optical back focal length of the optical lens. By limiting 0 ≤ TAN(CRA) × BFL ≤ 0.2, the incident angle of the principal ray in the maximum field of view of the optical lens is small, which is beneficial to ensuring a high receiving efficiency of the imaging chip and improving the imaging quality of the optical lens. In particular, for optical lenses used in lidar emission, it is beneficial to the high-energy emission of the laser and improve the light output efficiency. Preferably, the optical lens can further satisfy 0.01 ≤ TAN(CRA) × BFL ≤ 0.16 to further improve the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 0.0111 ≤ TAN(CRA) × BFL ≤ 0.1516 to further improve the imaging quality of the optical lens.

[0095] In one optional embodiment, the optical lens satisfies: -1.6 ≤ R5 / F2 ≤ -0.75; where R5 is the radius of curvature of the first side of the third lens, and F2 is the effective focal length of the second lens. By limiting -1.6 ≤ R5 / F2 ≤ -0.75, the ratio of the radius of curvature of the first side of the third lens to the effective focal length of the second lens is reasonably controlled, which can adjust the trend of the continuously diffused light after passing through the second lens to be slightly smoother, thereby alleviating the resolving pressure on the edge field of view of the subsequent third to sixth lenses, and thus improving the imaging quality of the optical lens. Preferably, the optical lens can further satisfy -1.4 ≤ R5 / F2 ≤ -0.9 to balance the optical path trend of the optical lens, which is beneficial to further improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy -1.3980 ≤ R5 / F2 ≤ -0.9259, which is beneficial to further improve the resolving power of the optical lens and further improve the imaging quality of the optical lens.

[0096] It should be noted that the total optical length TTL of the optical lens is the distance on the optical axis between the first side surface of the first lens and the imaging plane of the optical lens; the optical back focal length BFL is the distance on the optical axis between the second side surface of the sixth lens and the imaging plane of the optical lens; the sagitta SAG10 of the second side surface of the fifth lens is the distance on the optical axis between the intersection of the second side surface of the fifth lens and the optical axis of the optical lens and the vertex of the effective radius of the second side surface of the fifth lens; and the sagitta SAG11 of the first side surface of the sixth lens is the distance on the optical axis between the intersection of the first side surface of the sixth lens and the optical axis of the optical lens and the vertex of the effective radius of the first side surface of the sixth lens.

[0097] In another alternative implementation, the effective focal length of the third lens can be set to be larger by controlling -12≤F3 / F≤-5. In this case, the incident angle of the large field of view light transmitted by the first and second lenses can be adjusted, thereby ensuring that the apertures of the subsequent fourth, fifth and sixth lenses are smaller, compressing the volume of the optical lens and reducing material costs. At the same time, aberration balance adjustment is performed on the large field of view light gathered by the first and second lenses with negative optical power, especially the coma adjustment under the large field of view, ultimately achieving high imaging quality of the optical lens.

[0098] In another optional embodiment, by setting -1.7≤R8 / R7≤-0.8, 0.8≤(CT3+CT4) / F4≤1.3, and 2.2≤F34 / F≤5.5, the radii of curvature of the first and second sides of the fourth lens are close to or equal, and both the first and second sides of the fourth lens are convex surfaces. Together with the third lens, they form a thick lens group, generating high positive refractive power, undertaking the main converging task, and maintaining superior performance. The cemented joint between the third and fourth lenses serves as an intermediate transition. The thicker cemented lens helps improve structural stability and optical performance. Simultaneously, the smaller effective focal length of the fourth lens balances the optical power distribution of the front and rear optical systems, preventing excessive elongation of the optical lens, thereby achieving a smaller overall length of the optical lens, conforming to the miniaturization trend of radar modules. Optionally, the aforementioned optical lens may also include a filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the imaging plane.

[0099] The optical lens in this application can employ multiple lenses, such as the six lenses mentioned above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. The use of aspherical lenses helps correct system aberrations and improves resolving power. Specifically, when the imaging quality of the optical lens is of primary concern, all six lenses can be aspherical lenses.

[0100] In an exemplary embodiment, the first to sixth lenses can all be glass lenses. Optical lenses made of glass can suppress the shift in the back focus of the optical lens due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids lens blurring caused by high and low temperature variations in the operating environment, thus preventing interference with normal lens use. For example, an all-glass optical lens has a wider temperature range, maintaining stable optical performance within the range of -40℃ to 105℃. Specifically, when resolution and reliability are of primary concern, the first to sixth lenses can all be aspherical glass lenses. Of course, in applications with lower temperature stability requirements, the first to sixth lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Alternatively, the first to sixth lenses in the optical lens can also be made of a combination of plastic and glass.

[0101] 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 necessary, the optical lens may also include other numbers of lenses.

[0102] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0103] It should be noted that in the basic structural parameter tables of the optical lenses in Examples 1 to 14, the units of radius of curvature (Radius) and thickness (Thickness / distance) are all millimeters (mm), Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity. In the MTF curves of the optical lenses in Examples 1 to 14, the horizontal axis represents spatial frequency, with units of lp / mm (Spatial Frequency in cycles per mm); the vertical axis represents the modulus of the OTF (Optical Transfer Function). Specifically, 0.00 (deg) - Tangential represents the curve at 0° meridional field of view, i.e., the curve at the center of the meridional field of view; 0.00 (deg) - Sagittal represents the curve at 0° sagittal field of view, i.e., the curve at the center of the sagittal field of view; 46.74 (deg) - Tangential represents the curve at 46.74° meridional field of view; 46.74 (deg) - Sagittal represents the curve at 46.74° sagittal field of view; 85.3 (deg) - Tangential represents the curve at 85.3° meridional field of view; 85.3 (deg) - Sagittal represents the curve at 85.3° sagittal field of view.

[0104] Example 1

[0105] like Figure 1 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0106] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 1 shows the basic structural parameters of the optical lens in Embodiment 1.

[0107] Table 1

[0108]

[0109] Figure 15 The MTF curve of the optical lens in Embodiment 1 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 15 As can be seen, the optical lens achieves a resolution of over 0.75 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0110] Example 2

[0111] like Figure 2 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0112] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 2 shows the basic structural parameters of the optical lens in Embodiment 2.

[0113] Table 2

[0114]

[0115] Figure 16 The MTF curve of the optical lens in Embodiment 2 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 16 As can be seen, the optical lens achieves a resolution of over 0.78 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0116] Example 3

[0117] like Figure 3 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0118] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 3 shows the basic structural parameters of the optical lens in Embodiment 3.

[0119] Table 3

[0120]

[0121] Figure 17 The MTF curve of the optical lens in Embodiment 3 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 17 As can be seen, the optical lens achieves a resolution of over 0.78 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0122] Example 4

[0123] like Figure 4 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0124] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 4 shows the basic structural parameters of the optical lens in Embodiment 4.

[0125] Table 4

[0126]

[0127] Figure 18 The MTF curve of the optical lens in Embodiment 4 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 18 As can be seen, the optical lens achieves a resolution of over 0.72 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0128] Example 5

[0129] like Figure 5 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0130] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 5 shows the basic structural parameters of the optical lens in Embodiment 5.

[0131] Table 5

[0132]

[0133] Figure 19 The MTF curve of the optical lens in Embodiment 5 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 19 As can be seen, the optical lens achieves a resolution of over 0.54 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0134] Example 6

[0135] like Figure 6 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0136] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 6 shows the basic structural parameters of the optical lens in Embodiment 6.

[0137] Table 6

[0138]

[0139] Figure 20 The MTF curve of the optical lens of Embodiment Six is ​​shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 20 As can be seen, the optical lens achieves a resolution of over 0.43 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0140] Example 7

[0141] like Figure 7 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0142] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 7 shows the basic structural parameters of the optical lens in Embodiment 7.

[0143] Table 7

[0144]

[0145] Figure 21 The MTF curve of the optical lens of Embodiment Seven is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 21 As can be seen, the optical lens achieves a resolution of over 0.75 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0146] Example 8

[0147] like Figure 8 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0148] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 8 shows the basic structural parameters of the optical lens of Embodiment 8.

[0149] Table 8

[0150]

[0151] Figure 22 The MTF curve of the optical lens of Embodiment 8 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 22 As can be seen, the optical lens achieves a resolution of over 0.76 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0152] Example 9

[0153] like Figure 9 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0154] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is flat, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 9 shows the basic structural parameters of the optical lens of Embodiment 9.

[0155] Table 9

[0156]

[0157] Figure 23 The MTF curve of the optical lens of Embodiment Nine is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 23 As can be seen, the optical lens achieves a resolution of over 0.80 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0158] Example 10

[0159] like Figure 10 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0160] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is flat, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 10 shows the basic structural parameters of the optical lens of Embodiment 10.

[0161] Table 10

[0162]

[0163] Figure 24 The MTF curve of the optical lens of Embodiment 10 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 24 As can be seen, the optical lens achieves a resolution of over 0.81 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0164] Example 11

[0165] like Figure 11 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0166] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is flat. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 11 shows the basic structural parameters of the optical lens of Embodiment Eleven.

[0167] Table 11

[0168]

[0169] Figure 25 The MTF curve of the optical lens of Embodiment Eleven is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 25 As can be seen, the optical lens achieves a resolution of over 0.67 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0170] Example 12

[0171] like Figure 12 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0172] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is flat. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 12 shows the basic structural parameters of the optical lens of Embodiment Twelve.

[0173] Table 12

[0174]

[0175] Figure 26 The MTF curve of the optical lens of Embodiment Twelve is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 26 As can be seen, the optical lens achieves a resolution of over 0.67 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0176] Example 13

[0177] like Figure 13 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0178] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is flat, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is flat. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 13 shows the basic structural parameters of the optical lens of Embodiment Thirteen.

[0179] Table 13

[0180]

[0181] Figure 27 The MTF curve of the optical lens of Embodiment Thirteen is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 27 As can be seen, the optical lens achieves a resolution of over 0.70 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0182] Example 14

[0183] like Figure 14 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0184] In this embodiment, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is flat, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is flat. The third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging plane IMA. Table 14 shows the basic structural parameters of the optical lens of Embodiment Fourteen.

[0185] Table 14

[0186]

[0187] Figure 28 The MTF curve of the optical lens of Embodiment Fourteen is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 28 As can be seen, the optical lens achieves a resolution of over 0.69 at 28 lp / mm, producing a uniform image that meets the requirements for high resolution and demonstrates excellent imaging performance.

[0188] Comparative Example 1

[0189] like Figure 29 As shown, the optical lens, from the object side to the image side, includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging plane IMA.

[0190] In Comparative Example 1, the first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. In this lens, the third lens E3 and the fourth lens E4 form a cemented lens, and the aperture stop STO is located between the second lens E2 and the third lens E3. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging plane IMA. Table 15 shows the basic structural parameters of the optical lens in Comparative Example 1.

[0191] Table 15

[0192]

[0193] Compared with Examples 1 to 7, in the optical lens of Comparative Example 1, T56 is only 2.004mm. At this time, T56 / R10=-0.169. The air gap between the fifth lens and the sixth lens on the optical axis is relatively small. The angle between the edge field of view rays and the optical axis is too large, which is not conducive to the imaging surface receiving light and affects the imaging quality. Figure 30 The MTF curve of the optical lens in Comparative Example 1 is shown, which represents the optical lens's ability to transmit light of different wavelengths. Figure 30 As can be seen, the minimum resolution of this optical lens is as low as 0.27 at 28 lp / mm, resulting in a blurry image and poor imaging quality.

[0194] Compared with Examples 1 to 7, it can be seen that increasing the air gap between the fifth lens and the sixth lens on the optical axis can effectively ensure that the height of the intersection point of the principal rays of each field of view at the first side of the sixth lens is close to the corresponding image height, so that the principal rays of each field of view are nearly parallel to the optical axis. This ensures that the imaging surface has high receiving efficiency and imaging quality while limiting the size of the optical lens, and ultimately achieves a wide field of view, a small CRA, and high imaging quality for the optical lens.

[0195] It should be noted that the air gap between the fifth and sixth lenses on the optical axis cannot be extended indefinitely. To ensure the miniaturization of the optical lens and the imaging quality, the optical lens needs to be constrained to satisfy -0.42≤T56 / R10≤-0.25.

[0196] In summary, Examples 1 to 7 satisfy the relationships shown in Table 16, and Examples 8 to 14 satisfy the relationships shown in Table 17.

[0197] Table 16

[0198]

[0199] Table 17

[0200]

[0201] Table 18 shows the parameter values ​​of the optical lenses in Examples 1 to 7, and Table 19 shows the parameter values ​​of the optical lenses in Examples 8 to 14.

[0202] Table 18

[0203]

[0204] Table 19

[0205]

[0206] This application also provides an electronic device, including the aforementioned optical lens and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element may be a photosensitive coupler (CCD) or a complementary metal oxide semiconductor device (CMOS). The electronic device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This electronic device is equipped with the optical lens described above.

[0207] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0208] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0209] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0210] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens consists of six lenses, and the optical lens comprises, sequentially from the first side to the second side along the optical axis: A first lens having negative optical power, a first side surface of the first lens being convex, and a second side surface of the first lens being concave; The second lens has negative optical power, the first side of the second lens is convex, and the second side of the second lens is concave. The third lens has negative optical power, the first side of the third lens is convex, and the second side of the third lens is concave. The fourth lens has positive optical power, and the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is convex. The fifth lens has positive optical power, and the second side surface of the fifth lens is convex. The sixth lens has positive optical power, and the first side surface of the sixth lens is convex. The optical lens satisfies: -0.42≤T56 / R10≤-0.25, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and R10 is the radius of curvature of the second side surface of the fifth lens; The optical lens satisfies the following condition: -3.5≤F2 / F≤-2.3, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The first side surface of the fifth lens is concave; or The first side surface of the fifth lens is a convex surface; or The first side surface of the fifth lens is a plane.

3. The optical lens according to claim 1, characterized in that, The second side surface of the sixth lens is concave; or The second side surface of the sixth lens is a convex surface; or The second side surface of the sixth lens is a plane.

4. The optical lens according to claim 1, characterized in that, The third lens and the fourth lens are cemented together to form a cemented lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.34≤F / H≤0.42, where F is the effective focal length of the optical lens and H is the image height corresponding to the maximum field of view of the optical lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -12≤F3 / F≤-5, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.8≤(CT3+CT4) / F4≤1.3, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.8 ≤ F1 / F2 ≤ 1.4, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -3.5≤F1 / F≤-2.3, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.8≤F4 / F≤2.8, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 2.2≤F34 / F≤5.5, where F34 is the combined focal length of the third lens and the fourth lens, and F is the effective focal length of the optical lens.

12. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 3≤F5 / F≤10, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the optical lens.

13. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 3.8≤F6 / F≤7, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the optical lens.

14. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 2≤F6 / T56≤4.8, where F6 is the effective focal length of the sixth lens and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

15. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.18≤d34 / F5≤0.65, where d34 is the distance between the first side surface of the third lens and the second side surface of the fourth lens on the optical axis, and F5 is the effective focal length of the fifth lens.

16. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 3≤d34 / T45≤100, where d34 is the distance between the first side surface of the third lens and the second side surface of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

17. The optical lens according to any one of claims 1 to 16, characterized in that, The optical lens satisfies at least one of the following relationships: 10≤TTL / F≤12, 0.02≤TTL / H / FOV≤0.03, 1.7≤TTL / DMAX≤2.2, 0.46≤(F×θ) / D≤0.57, 0.01≤D / H / FOV≤0.015, 0.9≤D / H / F≤1.1, 0.1≤BFL / TTL≤0.18, 0.13≤F / ENPD / D≤0.18 and 0.09≤(H / 2) / (F×tan(θ / 2))≤0.12; Wherein, TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, DMAX is the maximum aperture of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, D is the aperture on 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.

18. The optical lens according to any one of claims 1 to 16, characterized in that, The optical lens satisfies at least one of the following relationships: -1.8≤R8 / R7≤-0.8, 0.65≤F5 / F6≤1.85, -7.8≤R10 / F≤-3, 3.3≤R1 / R2≤5.5, -0.25≤SAG10 / (D10 / 2)≤-0.05, 0.14≤SAG11 / (D11 / 2)≤0.41, 0≤TAN(CRA)×BFL≤0.2, -1.6≤R5 / F2≤-0.75 and 4≤d34 / T45≤74; Wherein, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R7 is the radius of curvature of the first side surface of the fourth lens, R8 is the radius of curvature of the second side surface of the fourth lens, R10 is the radius of curvature of the second side surface of the fifth lens, F is the effective focal length of the optical lens, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, BFL is the optical back focal length of the optical lens, and SAG10 is the... The sag of the second side surface of the fifth lens is given by SAG11, the sag of the first side surface of the sixth lens is given by D10, the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the fifth lens is given by D11, the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the sixth lens is given by CRA, the incident angle of the principal ray of the maximum field of view of the optical lens on the imaging plane is given by CRA, d34 is the distance between the first side surface of the third lens and the second side surface of the fourth lens on the optical axis is given by T45, and the air gap between the fourth lens and the fifth lens on the optical axis is given by T45.

19. The optical lens according to any one of claims 1 to 16, characterized in that, The optical lens satisfies at least one of the following relationships: 10.6≤TTL / F≤11.5, 0.023≤TTL / H / FOV≤0.026, 1.8≤TTL / DMAX≤2.1, 0.49≤(F×θ) / D≤0.55, 0.012≤D / H / FOV≤0.014, 0.94≤D / H / F≤1.05, 0.12≤BFL / TTL≤0.17, 0.35≤F / H≤0.4, 0.14≤F / ENPD / D≤0.17, 0.1≤(H / 2) / (F×tan(θ / 2))≤0.11, -0.4≤T56 / R10≤-0.28, -11≤F3 / F≤-7, -1.65≤R8 / R7≤-0.95, 0.9≤(CT3+CT4) / F4≤1.2, 0.9≤F1 / F2≤1.3, -3.3≤F1 / F≤-2.5、-3.3≤F2 / F≤-2.5、2≤F4 / F≤2.6、3≤F34 / F≤5、 4.2≤F5 / F≤8.5, 4.5≤F6 / F≤6.2, 0.9≤F5 / F6≤1.7, 2.4≤F6 / T56≤4.1 -7≤R10 / F≤-3.5, 3.8≤R1 / R2≤5, -0.21≤SAG10 / (D10 / 2)≤-0.09, 0.19≤SAG11 / (D11 / 2)≤0.36, 0.01≤TAN(CRA)×BFL≤0.16, 0.25≤d34 / F5≤0.54, 5≤d34 / T45≤64 and -1.4≤R5 / F2≤-0.9; Wherein, FOV is the maximum field of view of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, CRA is the incident angle of the principal ray of the maximum field of view of the optical lens on the imaging plane, F is the effective focal length of the optical 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, F34 is the combined focal length of the third and fourth lenses, BFL is the optical back focal length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, DMAX is the maximum aperture of the optical lens, D is the aperture on the first side of the first lens corresponding to the maximum field of view of the optical lens, and D10 is the aperture on the second side of the fifth lens corresponding to the maximum field of view of the optical lens. The aperture corresponding to the angle, D11 is the aperture corresponding to the maximum field of view of the optical lens on the first side of the sixth lens, R1 is the radius of curvature of the first side of the first lens, R2 is the radius of curvature of the second side of the first lens, R5 is the radius of curvature of the first side of the third lens, R7 is the radius of curvature of the first side of the fourth lens, R8 is the radius of curvature of the second side of the fourth lens, R10 is the radius of curvature of the second side of the fifth lens, CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, SAG10 is the sag of the second side of the fifth lens, SAG11 is the sag of the first side of the sixth lens, d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

20. An electronic device, characterized in that, It includes an optical lens according to any one of claims 1 to 19 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images