Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment. The optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from a first side to a second side along an optical axis, the second lens has negative focal power; the third lens has positive focal power; the fourth lens has negative focal power; the first side surface of the fifth lens is a convex surface, and the second side surface of the fifth lens is a concave surface; the first side surface of the sixth lens is a convex surface, and the second side surface of the sixth lens is a concave surface; wherein the number of lenses with focal power in the optical lens is six; the curvature radius R10 of the second side face of the fifth lens and the optical total length TTL of the optical lens meet the condition that R10 / TTL is larger than or equal to 0.09 and smaller than or equal to 2.82. The curvature radius R12 of the second side face of the sixth lens and the focal length F4 of the fourth lens meet the condition that R12 / F4 is larger than or equal to-0.41 and smaller than or equal to-0.05.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical lens and an electronic device. Background Art

[0002] In recent years, with the rapid development of automobile assisted driving technology, optical lenses are being used more and more widely in automobiles, such as vehicle-mounted optical lenses or lidar lenses.

[0003] In the automotive automated driving assistance system, the LiDAR lens is a key component for detecting information around the car. In order to meet the evolving usage needs of the automated driving assistance system, the LiDAR lens has a development trend towards miniaturization and small FNO.

[0004] Due to the high safety requirements of automobile driving assistance systems, in order to achieve more accurate signal detection, a small FNO is usually used to increase the amount of light entering and the number of lenses is increased to improve image quality. However, such optical lenses are relatively large in size and expensive, which is not conducive to miniaturization and cost reduction. Summary of the invention

[0005] On one hand, the present application provides an optical lens, which includes, in order from the first side to the second side along the optical axis: a first lens with negative optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with optical power, whose first side surface is convex and whose second side surface is concave; and a sixth lens with optical power, whose first side surface is convex and whose second side surface is concave; wherein the number of lenses with optical power in the optical lens is six; a curvature radius R10 of the second side surface of the fifth lens and the optical total length TTL of the optical lens satisfy: 0.09≤R10 / TTL≤2.82; a curvature radius R12 of the second side surface of the sixth lens and the focal length F4 of the fourth lens satisfy: -0.41≤R12 / F4≤-0.05.

[0006] On the other hand, the present application provides an electronic device. The electronic device includes the optical lens provided by the present application, and also includes at least one of an imaging element and a light source, wherein the imaging element is used to convert an optical image formed by the optical lens into an electrical signal; and the light emitted by the light source is projected to a target area after passing through the optical lens to form an image or illuminate the area.

[0007] The optical lens according to the embodiment of the present application includes six lenses with optical power, which are respectively the first lens to the sixth lens arranged in sequence from the first side to the second side along the optical axis. The optical lens can meet the following conditional formulas: 0.09≤R10 / TTL≤2.82; -0.41≤R12 / F4≤-0.05, wherein the light passing through the fourth lens is adjusted by the fifth lens and the sixth lens, and then emitted from the second side surface of the sixth lens, and finally hits the imaging surface; by controlling the ratio range of the radius of curvature of the second side surface of the fifth lens to the total optical length of the optical lens, that is, 0.09≤R10 / TTL≤2.82, the relative position of the pupil image of the secondary reflection ghost image on the second side surface of the fifth lens on the focal plane can be changed, so that the pupil image of the ghost image is far away from the focal plane, effectively The relative energy value of the ghost image is reduced, and the quality of the lens imaging picture is improved; and the ratio range of the curvature radius of the second side of the fifth lens and the optical total length of the optical lens is controlled, and the light output from the fifth lens can also be finally adjusted, so that the light is smoothly incident on the sixth lens, and the light is finally emitted from the second side of the sixth lens and hits the imaging surface; further reasonably matching the ratio of the curvature radius of the second side of the sixth lens to the focal length of the fourth lens, that is, -0.41≤R12 / F4≤-0.05, controlling the focal power of the fourth lens to be negative, and the second side of the sixth lens to be concave, so that the second side of the sixth lens can receive the light diverged by the fourth lens, which is conducive to the smooth transition of the light trend passing through the sixth lens, improving the lens resolution, and at the same time, it is conducive to collecting light and ensuring the amount of light. In this way, by controlling the focal power of the fourth lens, the second side of the fifth lens, and the curvature of the second side of the sixth lens within the above range, the relative position of the pupil image of the secondary reflection ghost image on the focal plane can be changed synchronously, so that the pupil image of the ghost image is far away from the focal plane, effectively reducing the relative energy value of the ghost image, and improving the quality of the lens imaging picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Other features, purposes and advantages of the present utility model will become more apparent through the detailed description of the following embodiments in conjunction with the accompanying drawings. In the accompanying drawings: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 The schematic diagrams of the structures of the optical lenses according to Embodiments 1 to 13 of the present application are shown respectively; Fig.14 , Fig.15 and Fig.16Schematic diagrams of MTF curves of optical lenses according to Embodiment 4, Embodiment 9 and Embodiment 13 of the present application are respectively shown. DETAILED DESCRIPTION

[0009] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0010] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0011] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0012] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, the surface of each lens closest to the second side is called the second side surface of the lens, and the surface of the optical lens closest to the second side is called the second side surface of the optical lens.

[0013] It should be understood that the optical lens provided in the present application can be used for both video and projection, and can also be used as a laser radar lens. When the optical lens provided in the present application is used for a camera lens or a laser radar receiving end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image side. The light from the object side can be imaged on the image side, for example, wherein the camera lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc.; when the optical lens provided in the present application is used for a projection lens or a radar transmitting end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the light source side. The second side of the optical lens may be provided with a light source, and the light source may provide light with or without image information. The light from the light source side passes through the optical lens and is projected to the target area on the first side (object side), for example, an image can be formed on the first side or an area can be illuminated.

[0014] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0015] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0016] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0017] The features, principles and other aspects of the present application are described in detail below.

[0018] In an exemplary embodiment, the optical lens may include, for example, six lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in sequence from the first side to the second side along the optical axis.

[0019] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens, in which case the second side of the optical lens can be an image source side, and the first side can be an object side. The second side of the optical lens is provided with an image source surface of the optical lens.

[0020] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a vehicle-mounted camera lens or a laser radar receiving end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side. The second side of the optical lens is provided with an imaging surface of the optical lens.

[0021] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0022] In an exemplary embodiment, the first lens may have a negative optical power, and its first side surface is a concave surface and the second side surface is a convex surface. The first lens has a negative optical power, which plays a role in diffusing light, collects as much light of a large field of view as possible to enter the rear optical system, and is conducive to achieving a large field of view. The shape of the first lens is a meniscus and convex to the second side, wherein the first side surface is a concave surface, which is conducive to receiving sufficient light, and the second side surface is a convex surface, which can converge the front light and increase the optical path of the large-angle field of view.

[0023] In an exemplary embodiment, the first lens may have negative optical power, and its first side surface is convex and its second side surface is concave. The first lens has negative optical power, is in the shape of a meniscus and is concave toward the second side, wherein the first side surface is convex, which is conducive to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0024] In an exemplary embodiment, the first lens may have negative optical power, and its first side surface is concave, and its second side surface is concave. The first lens has negative optical power and is biconcave in shape, wherein the first side surface is concave to facilitate receiving sufficient light, and the second side surface is concave to allow light to be smoothly incident on the system for imaging.

[0025] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface is a concave surface, and its second side surface is a convex surface. The second lens has a negative optical power and has a divergent effect on the light, and receives the light passing through the first lens, so that the height of the edge field of view light beam is higher and the width is wider, which is conducive to improving the relative illumination of the edge field of view. The shape of the second lens is a meniscus and convex to the second side, wherein the first side surface is a concave surface, which is conducive to receiving sufficient light, and the second side surface is a convex surface, which can converge the front light and increase the optical path of the large-angle field of view.

[0026] In an exemplary embodiment, the second lens may have negative optical power, and its first side surface is convex and its second side surface is concave. The second lens is in the shape of a meniscus and is concave toward the second side, wherein the first side surface is convex, which is conducive to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0027] In an exemplary embodiment, the second lens may have negative optical power, and its first side surface is concave, and its second side surface is concave. The second lens has negative optical power and is biconcave in shape, wherein the first side surface is concave to facilitate receiving sufficient light, and the second side surface is concave to allow the light to be smoothly incident on the system for imaging.

[0028] In an exemplary embodiment, the third lens may have positive power, and its first side surface is concave and its second side surface is convex. The third lens has positive power, and when used with the second lens having negative power, it is beneficial to converge the light diffused by the second lens, further making the light trend more stable. The third lens is in the shape of a meniscus and convex to the second side, wherein the first side surface is concave, which is beneficial to receiving sufficient light, and the second side surface is convex, which can converge the light in front and increase the optical path of a large-angle field of view.

[0029] In an exemplary embodiment, the third lens may have positive optical power, a first side surface of which is convex, and a second side surface of which is concave. The third lens has positive optical power, is in the shape of a meniscus and is concave toward the second side, wherein the first side surface is convex, which is conducive to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0030] In an exemplary embodiment, the third lens may have positive optical power, a first side surface thereof is convex, and a second side surface thereof is convex. The third lens has positive optical power and a biconvex shape, which is conducive to converging the front light and adjusting the light trend. The biconvex structure makes it easier to adjust the light.

[0031] In an exemplary embodiment, the fourth lens may have a negative optical power, and its first side surface is concave and the second side surface is convex. The optical power of the fourth lens is negative, which is conducive to slightly diverging the light converged by the front group, so that the light smoothly transitions to the fifth lens, which is conducive to achieving a long back focus. The shape of the fourth lens is a meniscus and convex to the second side, wherein the first side surface is concave, which is conducive to receiving sufficient light, and the second side surface is convex, which can converge the front light and increase the optical path of a large-angle field of view.

[0032] In an exemplary embodiment, the fourth lens may have negative optical power, and its first side surface is convex and its second side surface is concave. The fourth lens has negative optical power, a meniscus shape and is concave toward the second side, wherein the first side surface is convex, which is conducive to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0033] In an exemplary embodiment, the fourth lens may have negative optical power, and its first side surface is concave, and its second side surface is concave. The fourth lens has negative optical power and is biconcave in shape, wherein the first side surface is concave to facilitate receiving sufficient light, and the second side surface is concave to allow light to be smoothly incident on the system for imaging.

[0034] In an exemplary embodiment, the fifth lens may have a negative optical power, and its first side surface is a convex surface, and its second side surface is a concave surface. The fifth lens has a negative optical power, which diffuses the light and allows the light to transition as smoothly as possible; the fifth lens is in the shape of a meniscus and is concave toward the second side, wherein the first side surface is a convex surface that is conducive to receiving light with a large field of view, and the second side surface is a concave surface that allows the light to be smoothly incident on the system for imaging.

[0035] In an exemplary embodiment, the fifth lens may have positive optical power, and its first side surface is convex and its second side surface is concave. The fifth lens has positive optical power, which enhances the convergence of light and makes the trend of the rear group of light flat, which is conducive to achieving a small CRA (Chief Ray Angle) and better matching with various chips; the fifth lens is in the shape of a meniscus and concave to the second side, wherein the first side surface is convex, which is conducive to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0036] In an exemplary embodiment, the sixth lens may have positive optical power, and its first side surface is convex and its second side surface is concave. The sixth lens has positive optical power and can receive front light, which is beneficial to improve resolution. The sixth lens is in the shape of a meniscus and is concave toward the second side, wherein the first side surface is convex, which is beneficial to receiving light with a large field of view, and the second side surface is concave, which can smoothly incident light into the system for imaging.

[0037] In an exemplary embodiment, the sixth lens may have a negative optical power, and its first side surface is a convex surface and the second side surface is a concave surface. The optical power of the sixth lens is negative, which is conducive to a smooth transition of light to the image plane. The shape of the sixth lens is a meniscus and is concave toward the second side, wherein the first side surface is a convex surface, which is conducive to receiving light with a large field of view, and the second side surface is a concave surface, which can smoothly incident light into the system for imaging.

[0038] In an exemplary embodiment, an aperture may be provided in the optical lens. For example, the aperture may be provided between the third lens and the fourth lens, or between the fourth lens and the fifth lens. The provision of the aperture is conducive to effectively converging the light entering the optical lens, reducing the lens aperture at the rear end of the optical system, and reducing the assembly sensitivity of the system. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be provided at other positions according to actual needs.

[0039] In an exemplary embodiment, the optical lens according to the present application can simultaneously satisfy the following conditions: 0.09≤R10 / TTL≤2.82; -0.41≤R12 / F4≤-0.05, wherein R10 is the radius of curvature of the second side surface of the fifth lens, TTL is the total optical length of the optical lens, that is, the distance from the first side surface of the first lens to the imaging surface (or image source surface) of the optical lens on the optical axis, R12 is the radius of curvature of the second side surface of the sixth lens, and F4 is the focal length of the fourth lens. When 0.09≤R10 / TTL≤2.82 is satisfied, the relative position of the pupil image of the secondary reflection ghost image on the second side surface of the fifth lens can be changed on the focal plane, so that the pupil image of the ghost image is far away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the lens imaging picture; when -0.41≤R12 / F4≤-0.05 is satisfied, the focal length of the fourth lens is controlled to be negative, and the second side surface of the sixth lens is concave, so that the second side surface of the sixth lens can receive the light diverged by the fourth lens. A reasonable combination of the curvature radius of the second side surface of the sixth lens and the focal length of the fourth lens is beneficial to making the light passing through the sixth lens transition smoothly, improving the lens resolution, and at the same time beneficial to collecting light and ensuring the amount of light transmitted. More specifically, the optical lens can further satisfy: 0.11≤R10 / TTL≤2.36; -0.34≤R12 / F4≤-0.07. By controlling the ratio of the radius of curvature of the second side surface of the fifth lens to TTL, and the ratio range of the radius of curvature of the second side surface of the sixth lens to the focal length of the fourth lens, the pupil image of the ghost image can be further moved away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the lens imaging picture; at the same time, it is conducive to a smoother transition of the light trend, and is conducive to light collection, ensuring the amount of light transmitted, and improving the resolution.

[0040] In an exemplary embodiment, the optical lens according to the present application may satisfy: -13.72≤F2 / F≤-1.45, wherein F2 is the focal length of the second lens, and F is the focal length of the entire optical lens group. By satisfying this conditional formula, the focal length of the second lens is reasonably allocated, and the focal length of the second lens is controlled to be negative and have a large focal length value, the light that has been diffused in front can be smoothly transitioned and further diffused, thereby increasing the amount of light entering the system and achieving a small FNO. More specifically, the optical lens may further satisfy: -11.41≤F2 / F≤-1.81. By controlling the ratio of the focal length of the second lens to the focal length of the entire optical lens group within this range, it is beneficial to make the light transition more smoothly and further diffuse, thereby further increasing the amount of light entering the system and achieving a small FNO.

[0041] In an exemplary embodiment, the optical lens according to the present application may satisfy: 56.9°≤(FOV*F) / H≤61.7°, where 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. Satisfying this conditional formula is conducive to the optical lens simultaneously satisfying the characteristics of telephoto, large field of view / large image height, and large angular resolution. More specifically, the optical lens may further satisfy: 57.9°≤(FOV F) / H≤60.7°, which is conducive to the optical lens to further meet the characteristics of long focal length, large field of view / large image height, and large angular resolution.

[0042] In an exemplary embodiment, the optical lens according to the present application may satisfy: 3.35≤TTL / F≤5.3. Satisfying this conditional expression can achieve a small TTL while ensuring the focal length, thereby satisfying the miniaturization of the optical system. More specifically, the optical lens may further satisfy: 3.7≤TTL / F≤4.92, which is conducive to further miniaturizing the optical system while ensuring the focal length.

[0043] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤TTL / H / FOV×1°≤0.31. Satisfying this conditional formula can effectively limit the length of the lens when the image height and the field of view angle are constant, thereby realizing miniaturization of the lens. More specifically, the optical lens may further satisfy: 0.22≤TTL / H / FOV×1°≤0.29, which is conducive to further limiting the length of the lens, thereby realizing miniaturization of the lens.

[0044] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5≤TTL / DMAX≤3.4, where DMAX is the maximum value of the maximum aperture of each optical surface in the first lens to the sixth lens. When this condition is satisfied, under a certain maximum aperture, the entire optical system is made more compact by controlling the total optical length, which is conducive to miniaturization. More specifically, the optical lens may further satisfy: 1.8≤TTL / DMAX≤2.96, which is conducive to further miniaturization of the optical system.

[0045] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.25≤(F θ) / D≤0.44, where θ is the radian value corresponding to the maximum field of view of the optical lens, and D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens. Satisfying this conditional formula and controlling the ratio of the entire set of focal length, field of view and aperture of the optical lens can make the front port aperture of the lens smaller and reduce the imaging system volume of the lens. More specifically, the optical lens can further satisfy: 0.29≤(F θ) / D≤0.41, which is conducive to further controlling the small front diameter of the lens and reducing the volume of the imaging system of the lens.

[0046] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.06≤D / H / FOV×1°≤0.13. When this conditional formula is satisfied, under the condition of a certain image height and field of view angle, by controlling the aperture size, it is beneficial to make the front port diameter small, thereby achieving miniaturization. More specifically, the optical lens may further satisfy: 0.07≤D / H / FOV×1°≤0.12, which is beneficial to further control the front port diameter of the lens to be smaller and achieve miniaturization.

[0047] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.12≤D / H / F×1mm≤0.23. Satisfying this conditional formula, under the condition of a certain focal length, by controlling the ratio of the aperture and the image height, it is beneficial to provide a large target surface for the lens and realize the characteristics of a small aperture. More specifically, the optical lens may further satisfy: 0.14≤D / H / F×1mm≤0.21, which is beneficial to further provide a large target surface for the lens and realize the characteristics of a small aperture.

[0048] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03≤BFL / TTL≤0.19, where BFL is the back focal length of the optical lens, that is, the distance from the second side surface of the sixth lens to the imaging surface (or image source surface) of the optical lens on the optical axis. Satisfying this conditional formula can meet the special requirements of the short back focal length of the optical lens, while ensuring the reserved space for component installation and focusing, the total length of the system can be reduced, which is conducive to miniaturization. More specifically, the optical lens may further satisfy: 0.06≤BFL / TTL≤0.16, which is conducive to further satisfying the short back focal length of the optical lens while ensuring the miniaturization of the system.

[0049] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.79≤F / H≤2.0. Satisfying this conditional expression can control the focal length and image height within a certain range, which is conducive to improving the resolution. More specifically, the optical lens may further satisfy: 1.82≤F / H≤1.92, which is conducive to further improving the resolution.

[0050] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.56≤F / ENPD≤1.24, where ENPD is the entrance pupil diameter of the optical lens. Satisfying this conditional expression is conducive to achieving a small FNO and increasing the amount of light. More specifically, the optical lens may further satisfy: 0.7≤F / ENPD≤1.1, which is conducive to further achieving a small FNO and increasing the amount of light.

[0051] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤F / ENPD / D×1mm≤0.06. Satisfying this conditional formula is conducive to ensuring a small aperture while satisfying a high light flux, thereby realizing miniaturization of the lens. More specifically, the optical lens may further satisfy: 0.02≤F / ENPD / D×1mm≤0.05, which is conducive to further ensuring a small aperture while satisfying a high light flux, thereby realizing miniaturization of the lens.

[0052] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.62≤DST / F≤2.5, where DST is the effective aperture of the diaphragm. When this conditional expression is satisfied, by controlling the ratio of the diaphragm aperture to the effective focal length of the system to make it larger, the corresponding lens aperture is larger, further achieving high light throughput. More specifically, the optical lens may further satisfy: 0.98≤DST / F≤2.04, which is conducive to further achieving high light throughput.

[0053] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.9≤(H / 2) / (F tan(θ / 2))≤0.98. This condition is met, and a high angular resolution is achieved by controlling the ratio of the actual image height to the ideal image height. More specifically, the optical lens can further satisfy: 0.91≤(H / 2) / (F tan(θ / 2))≤0.97, which is conducive to further achieving large angular resolution.

[0054] In an exemplary embodiment, the optical lens according to the present application may satisfy: -16.5≤F1 / F≤-1.12, where F1 is the focal length of the first lens. This conditional formula is satisfied, and the focal length of the first lens is reasonably allocated, so that the focal length of the first lens is negative and the focal length value is large, which is conducive to smooth transition and diffusion of light, thereby increasing the amount of light entering the system, and ultimately achieving a small FNO. More specifically, the optical lens may further satisfy: -11.58≤F1 / F≤-2.65, which is conducive to further smooth transition and diffusion of light, thereby increasing the amount of light entering the system, and ultimately achieving a small FNO.

[0055] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.2≤F3 / F≤3.8, where F3 is the focal length of the third lens. When this condition is satisfied, the third lens is controlled to be positive and the focal length of the third lens is reasonably allocated to converge the light rays diverging in front, increase the optical path of the light rays in the edge field of view, and thus improve the image quality. More specifically, the optical lens may further satisfy: 1.76≤F3 / F≤3.28, which is conducive to the third lens further converging the light rays diverging in front, increasing the optical path of the light rays in the edge field of view, and improving the image quality.

[0056] In an exemplary embodiment, the optical lens according to the present application may satisfy: -14.1≤F4 / F≤-1.7, where F4 is the focal length of the fourth lens. This conditional formula is satisfied, and the focal length of the fourth lens is reasonably allocated, so that the focal length of the fourth lens is negative and the focal length value is large, which can make the light that has been converged in front to transition and diffuse smoothly, thereby increasing the amount of light entering the system and ultimately achieving a small FNO. More specifically, the optical lens may further satisfy: -11.49≤F4 / F≤-4.27, which is beneficial for the fourth lens to further make the light that has been converged in front to transition and diffuse smoothly, thereby further increasing the amount of light entering the system and ultimately achieving a small FNO.

[0057] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤(R9-CT5) / R10≤1.1, wherein R9 is the radius of curvature of the first side of the fifth lens, CT5 is the center thickness of the fifth lens, and R10 is the radius of curvature of the second side of the fifth lens. To meet this conditional formula, the shape of the fifth lens is controlled to be a meniscus, and the relationship ratio of the radius of curvature of the first side, the center thickness, and the radius of curvature of the second side is reasonably controlled to make the light transition as smoothly as possible, which is beneficial to reduce the sensitivity of the system and improve the resolution. More specifically, the optical lens may further satisfy: 0.05≤(R9-CT5) / R10≤0.71, which can further make the light transition smoothly, which is beneficial to further reduce the sensitivity of the system and improve the resolution.

[0058] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤(R11-CT6) / R12≤1.5, wherein R11 is the radius of curvature of the first side of the sixth lens, R12 is the radius of curvature of the second side of the sixth lens, and CT6 is the center thickness of the sixth lens. To meet this conditional expression, the shape of the sixth lens is controlled to be a meniscus, and the relationship ratio of the radius of curvature of the first side, the middle thickness, and the radius of curvature of the second side is reasonably controlled to make the light transition as smoothly as possible, which is beneficial to reduce the sensitivity of the system and improve the resolution. More specifically, the optical lens may further satisfy: 0.01≤(R11-CT6) / R12≤1.032, which can further make the light transition smoothly, which is beneficial to further reduce the sensitivity of the system and improve the resolution.

[0059] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤R9 / R10≤2.4. This conditional expression is satisfied, so that the fifth lens is in a meniscus shape, and the two side faces are oriented in the same direction, and the overall light beam is converged. When the R value ratio on both sides is controlled within this range, the central spherical aberration, edge field curvature, and astigmatism values ​​introduced by the fifth lens as a whole can be effectively reduced, thereby improving the image quality. More specifically, the optical lens may further satisfy: 0.09≤R9 / R10≤1.6, which may further effectively reduce the central spherical aberration, edge field curvature, and astigmatism values ​​introduced by the fifth lens as a whole, thereby improving the image quality.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1≤R11 / R12≤2. To satisfy this conditional expression, the sixth lens is in a meniscus shape, and the two side faces are oriented in the same direction, and the overall light beam is converged. When the ratio of the R values ​​on both sides is controlled within this range, the central spherical aberration, edge field curvature, and astigmatism values ​​introduced by the sixth lens as a whole can be effectively reduced, thereby improving the image quality. More specifically, the optical lens may further satisfy: 0.21≤R11 / R12≤1.5, which may further effectively reduce the central spherical aberration, edge field curvature, and astigmatism values ​​introduced by the sixth lens as a whole, thereby improving the image quality.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.14≤R9 / TTL≤0.32. This conditional formula is satisfied, and the ratio of the radius of curvature of the first side surface of the fifth lens to the total optical length is controlled, and the received light is deflected inward, which is conducive to reducing the diameter of the back port and achieving miniaturization. More specifically, the optical lens may further satisfy: 0.17≤R9 / TTL≤0.28, which is conducive to further reducing the diameter of the back port and achieving miniaturization.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤R11 / TTL≤0.53. This conditional formula is satisfied, and the ratio of the radius of curvature of the first side surface of the sixth lens to the total optical length is controlled, and the received light passing through the sixth lens is deflected inward, which is conducive to reducing the diameter of the back port and achieving miniaturization. More specifically, the optical lens may further satisfy: 0.1≤R11 / TTL≤0.42, which is conducive to further reducing the diameter of the back port and achieving miniaturization.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03≤R12 / TTL≤0.86. By satisfying this conditional formula, the ratio of the radius of curvature of the second side of the sixth lens to the total optical length can be controlled to allow light to enter as smoothly as possible, which is beneficial to the low sensitivity of the system and improves the resolution. More specifically, the optical lens may further satisfy: 0.13≤R12 / TTL≤0.66, which is beneficial to further reduce the sensitivity of the system and improve the resolution.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤R9 / |F5|≤1.1, where F5 is the focal length of the fifth lens. By satisfying this conditional formula, the ratio of the radius of curvature of the first side of the fifth lens to the focal length of the fifth lens is controlled, and light can be converged, more light is collected to enter, and the resolution is improved. More specifically, the optical lens may further satisfy: 0.07≤R9 / |F5|≤0.72, which is conducive to further converging light, collecting more light to enter, and improving the resolution.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤R10 / |F5|≤11.3. By satisfying this conditional formula, the ratio of the radius of curvature of the second side of the fifth lens to the focal length of the fifth lens can be controlled to allow light to enter as smoothly as possible, which is beneficial to reducing the sensitivity of the system and improving the resolution. More specifically, the optical lens may further satisfy: 0.05≤R10 / |F5|≤7.3, which is beneficial to further reducing the sensitivity of the system and improving the resolution.

[0066] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.02≤R11 / |F6|≤1, where F6 is the focal length of the sixth lens. Satisfying this conditional expression and controlling the ratio of the radius of curvature of the first side surface of the sixth lens to the focal length of the sixth lens is conducive to converging light and improving resolution. More specifically, the optical lens may further satisfy: 0.12≤R11 / |F6|≤0.68, which is conducive to the sixth lens further converging light and improving resolution.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤R12 / |F6|≤4.5. By satisfying this conditional formula, the ratio of the radius of curvature of the second side of the sixth lens to the focal length of the fifth lens can be controlled to allow light to enter as smoothly as possible, which is beneficial to reducing the sensitivity of the system and improving the resolution. More specifically, the optical lens may further satisfy: 0.09≤R12 / |F6|≤3.1, which is beneficial to further reducing the sensitivity of the system and improving the resolution.

[0068] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.85≤F / F1+F / F2≤-0.03. This conditional expression is satisfied, and the sum of the ratios of the focal lengths of the first lens and the second lens to the total focal length is controlled, so that the light passing through the first lens and the second lens of the front group smoothly transitions and diffuses, thereby increasing the amount of light entering the system and ultimately achieving a small FNO. More specifically, the optical lens may further satisfy: -0.7≤F / F1+F / F2≤-0.19, which is conducive to further increasing the amount of light entering the system and ultimately achieving a small FNO.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: -18≤F2 / (CT2+T23)≤-0.6, wherein CT2 is the center thickness of the second lens, and T23 is the air gap between the second lens and the third lens on the optical axis, that is, the distance from the second side of the second lens to the first side of the third lens along the optical axis. By satisfying this conditional formula, the ratio of the focal length of the second lens to the center thickness of the second lens and the sum of the air gaps between the second lens and the third lens is controlled, and the light emitted through the second lens can be smoothly transitioned, which is beneficial to the low sensitivity of the system and improves the resolution. More specifically, the optical lens may further satisfy: -12.6≤F2 / (CT2+T23)≤-1.6, and the smooth transition of the light emitted through the second lens can be further controlled, which is beneficial to further ensure the low sensitivity of the system and improve the resolution.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.49≤F3 / F4≤-0.12. This conditional expression is satisfied, and the focal length ratio of the third lens to the fourth lens is controlled, so that the light rays converged by the third lens and the fourth lens can smoothly transition, which is beneficial to the low sensitivity of the system and improves the resolution. More specifically, the optical lens may further satisfy: -0.42≤F3 / F4≤-0.19, which is beneficial to further ensure the low sensitivity of the system and improve the resolution.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤|F5| / F≤17. When this condition is satisfied, the focal length of the fifth lens is reasonably allocated, so that the light passing through the fifth lens can transition smoothly, thereby improving the resolution. More specifically, the optical lens may further satisfy: 1.5≤|F5| / F≤11.5, which is conducive to further allowing the light passing through the fifth lens to transition smoothly, thereby improving the resolution.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.3≤|F6| / F≤18. When this condition is satisfied, the focal length of the sixth lens is reasonably allocated, so that the light passing through the sixth lens can transition smoothly, thereby improving the resolution. More specifically, the optical lens may further satisfy: 0.8≤|F6| / F≤11.6, which is conducive to further allowing the light passing through the sixth lens to transition smoothly, thereby improving the resolution.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.0003≤T12 / TTL≤0.12, wherein T12 is the air spacing between the first lens and the second lens on the optical axis, that is, the distance from the second side of the first lens to the first side of the second lens along the optical axis. By satisfying this conditional formula, the distance between the first lens and the second lens is controlled so that the light diverges quickly, which can effectively limit the length of the lens and is conducive to miniaturization of the lens. More specifically, the optical lens may further satisfy: 0.001≤T12 / TTL≤0.08, which is conducive to further miniaturization of the lens.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.6°≤FOV / F×1mm≤2.0°. By satisfying this conditional formula, the ratio of the field of view angle of the optical lens to the overall focal length is controlled, and long-distance detection can be achieved. More specifically, the optical lens may further satisfy: 1.7°≤FOV / F×1mm≤1.9°, which is conducive to further achieving long-distance detection.

[0075] According to the optical lens of the above-mentioned embodiment of the present application, by reasonably setting the number of lenses and the shape and optical focal length of each lens, it is possible to meet the requirements of small FNO, high light throughput, high resolution, etc. while meeting the miniaturization of the system.

[0076] In an exemplary embodiment, at least one of the optical surfaces of the first lens to the sixth lens of the optical lens has an inflection. The setting of the inflection is conducive to further correcting the light, so that the light smoothly transitions to the next surface, and the inflection can correct the edge light angle, reduce the edge field aberration, and improve the resolution. In an exemplary embodiment, the second side surface of the fifth lens or the first side surface of the sixth lens may have an inflection point. The setting of the inflection point is conducive to achieving better correction of the aberration of the light emitted from different fields of view while maintaining the overall shape of the lens.

[0077] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the sixth lens and the imaging plane to filter light with different wavelengths to prevent damage to the image-side element (e.g., chip) of the optical lens.

[0078] In an exemplary embodiment, the first lens to the sixth lens may be a spherical lens or an aspherical lens. Exemplarily, at least one of the first lens to the sixth lens is an aspherical lens. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, or even all lenses use aspherical lenses.

[0079] In an exemplary embodiment, the sixth lens may be an aspherical lens, or the fifth lens and the sixth lens may both be aspherical lenses. Since the aspherical lens has different curvatures at different positions, the light trend can be adjusted to converge to the image plane, which can better correct aberrations and improve resolution. It should be emphasized that, according to actual needs, other lenses may also use aspherical mirror surfaces.

[0080] In an exemplary embodiment, the first to sixth lenses may be glass lenses or plastic lenses. The present application does not specifically limit the specific number of glass lenses and plastic lenses. Specifically, when focusing on resolution quality and reliability, the first to sixth lenses may all be glass aspherical lenses. Optical lenses made of glass can suppress the deviation of the back focus of imaging system components with temperature changes to improve system stability. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Of course, the first to sixth lenses of the optical lens can also be made of a combination of plastic and glass. Of course, in applications where temperature stability requirements are lower, the first to sixth lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce production costs.

[0081] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0082] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0083] Example 1

[0084] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0085] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the first side to the second side along the optical axis.

[0086] In this embodiment, the optical lens further includes a stop STO, and the stop STO is disposed between the fourth lens L4 and the fifth lens L5.

[0087] The first lens L1 has negative optical power, and its first side surface S1 is concave, and the second side surface S2 is convex. The second lens L2 has negative optical power, and its first side surface S3 is convex, and the second side surface S4 is concave. The third lens L3 has positive optical power, and its first side surface S5 is convex, and the second side surface S6 is concave. The fourth lens L4 has negative optical power, and its first side surface S7 is convex, and the second side surface S8 is concave. The fifth lens L5 has negative optical power, and its first side surface S10 is convex, and the second side surface S11 is concave. The sixth lens L6 has positive optical power, and its first side surface S12 is convex, and the second side surface S13 is concave.

[0088] In this embodiment, the optical lens may further include a filter L7 and a protective glass L8 located between the sixth lens L6 and the imaging plane (or image source plane) IMA, the filter L7 has a first side surface S14 and a second side surface S15, and the protective glass L8 has a first side surface S16 and a second side surface S17.

[0089] When IMA is an imaging surface, light from the object passes through each surface S1 to S17 in sequence and is finally imaged on IMA. When IMA is an image source surface, light from IMA passes through each surface S17 to S1 in sequence and is finally projected on the object.

[0090] Table 1 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0091] Table 1

[0092] In this embodiment, the first side surface S10 and the second side surface S11 of the fifth lens L5 and the first side surface S12 and the second side surface S13 of the sixth lens L6 of the optical lens are aspherical mirror surfaces. The surface shape of each aspherical mirror surface can be defined by but not limited to the following aspherical formula (1).

[0093] (1)

[0094] in, x The aspheric surface is at a height of h When the position is , the distance vector height from the vertex of the aspherical surface; c is the paraxial curvature of the aspheric surface, c =1 / R (i.e., the paraxial curvature c is the radius of curvature in Table 1 above R The inverse of ); k is the cone coefficient; Ai Aspheric i -th order correction factor.

[0095] Table 2 shows the parameters of the aspheric mirror surface that can be used in this embodiment, wherein the surface shape of each aspheric mirror surface can be defined by the formula (1) given in the above embodiment 1.

[0096] Table 2

[0097] The optical lens of Example 1 has an MTF (Modulation Transfer Function) value of more than 0.607 at a spatial frequency of 50 lp / mm (cycles / millimeter). In terms of the RMS (Root Mean Square Radius) of the spot diagram, in the edge field of view, the root mean square radius of the spot on the image plane is 4.221 μm; in terms of the diffraction circle energy, within a circle with a diameter of 15 μm on the image plane, the proportion of the spot energy in the total light energy exceeds 98.092%. The optical lens provided in Example 1 has a high resolution.

[0098] Example 2

[0099] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0100] Figure 2 FIG. 2 is a schematic diagram of the structure of an optical lens of Example 2. Compared with Example 1, the difference in optical power and shape of this embodiment is that the first side surface S3 of the second lens L2 is a concave surface.

[0101] Table 3 shows the parameters of each lens of the optical lens of Example 2.

[0102] Table 3

[0103] Table 4 shows the parameters of the aspheric lens that can be used in Example 2, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0104] Table 4

[0105] The MTF value of the optical lens of Example 2 at a spatial frequency of 50lp / mm exceeds 0.688. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 4.008μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 98.266%. The optical lens given in Example 2 has a high resolution.

[0106] Example 3

[0107] The following reference Figure 3 Describe the optical lens according to Example 3 of the present application.

[0108] Figure 3 FIG. 3 is a schematic diagram of the structure of an optical lens of Example 3. Compared with Example 1, the differences in optical power and shape of this embodiment are as follows: the second side surface S2 of the first lens L1 is a concave surface; the first side surface S3 of the second lens L2 is a concave surface, and the second side surface S4 is a convex surface; the second side surface S6 of the third lens L3 is a convex surface.

[0109] Table 5 shows the parameters of each lens of the optical lens of Example 3.

[0110] Table 5

[0111] Table 6 shows the parameters of the aspheric lens that can be used in Example 3, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0112] Table 6

[0113] The MTF value of the optical lens of Example 3 at a spatial frequency of 50lp / mm exceeds 0.766. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.620μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.649%. The optical lens given in Example 3 has a high resolution.

[0114] Example 4

[0115] The following reference Figure 4 Describe the optical lens according to Example 4 of the present application.

[0116] Figure 4 FIG. 4 is a schematic diagram of the structure of an optical lens of Example 4. Compared with Example 1, the differences in optical power and shape of this embodiment are as follows: the first side surface S1 of the first lens L1 is convex, and the second side surface S2 is concave; the first side surface S3 of the second lens L2 is concave, and the second side surface S4 is convex; the second side surface S6 of the third lens L3 is convex.

[0117] Table 7 shows the parameters of each lens of the optical lens of Example 4.

[0118] Table 7

[0119] Table 8 shows the parameters of the aspheric lens that can be used in Example 4, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0120] Table 8

[0121] The MTF value of the optical lens of Example 4 at a spatial frequency of 50lp / mm exceeds 0.762. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.416μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.773%. The optical lens given in Example 4 has a high resolution.

[0122] Example 5

[0123] The following reference Figure 5 Describe the optical lens according to Example 5 of the present application.

[0124] Figure 5 FIG. 5 is a schematic diagram of the structure of an optical lens of Example 5. Compared with Example 1, the differences in optical power and shape of this embodiment are as follows: the first side surface S3 of the second lens L2 is a concave surface, and the second side surface S4 is a convex surface; the first side surface S5 of the third lens L3 is a concave surface, and the second side surface S6 is a convex surface.

[0125] In this embodiment, the second side surface S11 of the fifth lens L5 has an inflection point.

[0126] Table 9 shows the parameters of each lens of the optical lens of Example 5.

[0127] Table 9

[0128] Table 10 shows parameters of the aspheric lens that can be used in Example 5, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0129] Table 10

[0130] The MTF value of the optical lens of Example 5 at a spatial frequency of 50lp / mm exceeds 0.596. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 5.710μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.590%. The optical lens given in Example 5 has a high resolution.

[0131] Example 6

[0132] The following reference Figure 6 Describe the optical lens according to Example 6 of the present application.

[0133] Figure 6 FIG. 6 is a schematic diagram of the structure of an optical lens of Example 6. Compared with Example 1, the differences in optical power and shape of this embodiment are as follows: the first side surface S3 of the second lens L2 is concave, and the second side surface S4 is convex; the first side surface S5 of the third lens L3 is concave, and the second side surface S6 is convex; the first side surface S7 of the fourth lens L4 is concave, and the second side surface S8 is convex; the fifth lens L5 has positive optical power; and the sixth lens L6 has negative optical power.

[0134] Table 11 shows the parameters of each lens of the optical lens of Example 6.

[0135] Table 11

[0136] Table 12 shows parameters of the aspheric lens that can be used in Example 6, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0137] Table 12

[0138] The MTF value of the optical lens of Example 6 at a spatial frequency of 50lp / mm exceeds 0.621. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 5.023μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.975%. The optical lens given in Example 6 has a high resolution.

[0139] Example 7

[0140] The following reference Figure 7 Describe the optical lens according to Example 7 of the present application.

[0141] Figure 7 FIG. 7 is a schematic diagram of the structure of an optical lens of Example 7. Compared with Example 1, the differences in optical power and shape of this embodiment are: the second side surface S2 of the first lens L1 is concave; the first side surface S3 of the second lens L2 is concave, and the second side surface S4 is convex; the second side surface S6 of the third lens L3 is convex; the first side surface S7 of the fourth lens L4 is concave, and the second side surface S8 is convex; the fifth lens L5 has positive optical power; and the sixth lens L6 has negative optical power.

[0142] In this embodiment, the first side surface S12 of the sixth lens L6 has an inflection point.

[0143] Table 13 shows the parameters of each lens of the optical lens of Example 7.

[0144] Table 13

[0145] Table 14 shows parameters of the aspheric lens that can be used in Example 7, wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 above.

[0146] Table 14

[0147] The MTF value of the optical lens of Example 7 at a spatial frequency of 50lp / mm exceeds 0.778. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.756μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.740%. The optical lens given in Example 7 has a high resolution.

[0148] Example 8

[0149] The following reference Figure 8 Describe the optical lens according to Example 8 of the present application.

[0150] Figure 8 FIG. 8 is a schematic diagram of the structure of an optical lens of Example 8. Compared with Example 1, the differences in optical power and shape of this embodiment are: the first side surface S1 of the first lens L1 is convex, and the second side surface S2 is concave; the first side surface S3 of the second lens L2 is concave; the first side surface S7 of the fourth lens L4 is concave, and the second side surface S8 is convex; the fifth lens L5 has positive optical power; and the sixth lens L6 has negative optical power.

[0151] Table 15 shows the parameters of each lens of the optical lens of Example 8.

[0152] Table 15

[0153] Table 16 shows parameters of the aspheric lens that can be used in Example 8, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0154] Table 16

[0155] The MTF value of the optical lens of Example 8 at a spatial frequency of 50lp / mm exceeds 0.591. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 6.623μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.223%. The optical lens given in Example 8 has a high resolution.

[0156] Example 9

[0157] The following reference Fig. 9 Describe the optical lens according to Example 9 of the present application.

[0158] Fig. 9 FIG. 9 is a schematic diagram of the structure of an optical lens of Example 9. Compared with Example 1, the differences in optical power and shape of this embodiment are: the first side surface S7 of the fourth lens L4 is concave, and the second side surface S8 is convex; the fifth lens L5 has positive optical power; and the sixth lens L6 has negative optical power.

[0159] Table 17 shows the parameters of each lens of the optical lens of Example 9.

[0160] Table 17

[0161] Table 18 shows parameters of the aspheric lens that can be used in Example 9, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0162] Table 18

[0163] The MTF value of the optical lens of Example 9 at a spatial frequency of 50lp / mm exceeds 0.838. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.163μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 98.309%. The optical lens given in Example 9 has a high resolution.

[0164] Example 10

[0165] The following reference Fig.10 An optical lens according to Example 10 of the present application is described.

[0166] Fig.10FIG. 1 is a schematic diagram of the structure of an optical lens of Example 10. Compared with Example 1, the differences in optical power and shape of this embodiment are: the first side surface S3 of the second lens L2 is concave, and the second side surface S4 is convex; the first side surface S7 of the fourth lens L4 is concave; the fifth lens L5 has positive optical power; and the sixth lens L6 has negative optical power.

[0167] Table 19 shows the parameters of each lens of the optical lens of Example 10.

[0168] Table 19

[0169] Table 20 shows parameters of the aspheric lens that can be used in Example 10, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0170] Table 20

[0171] The MTF value of the optical lens of Example 10 at a spatial frequency of 50lp / mm exceeds 0.519. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 7.852μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 98.803%. The optical lens provided in Example 10 has a high resolution.

[0172] Embodiment 11

[0173] The following reference Fig.11 Describe the optical lens according to Example 11 of the present application.

[0174] Fig.11 FIG. 1 is a schematic diagram of the structure of an optical lens of Example 11. Compared with Example 1, this embodiment is different from Example 1 in that the aperture position is set between the third lens L3 and the fourth lens L4. In addition, the differences in optical power and shape are as follows: the second side surface S2 of the first lens L1 is concave; the first side surface S3 of the second lens L2 is concave, and the second side surface S4 is convex; the second side surface S6 of the third lens L3 is convex; and the fifth lens L5 has positive optical power.

[0175] Table 21 shows the parameters of each lens of the optical lens of Example 11.

[0176] Table 21

[0177] Table 22 shows parameters of the aspheric lens that can be used in Example 11, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0178] Table 22

[0179] The MTF value of the optical lens of Example 11 at a spatial frequency of 50lp / mm exceeds 0.746. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 3.487μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.711%. The optical lens given in Example 11 has a high resolution.

[0180] Example 12

[0181] The following reference Fig.12 Describe the optical lens according to Example 12 of the present application.

[0182] Fig.12 1 is a schematic diagram of the structure of an optical lens of Example 12. Compared with Example 1, this embodiment is different from Example 1 in that the aperture position is set between the third lens L3 and the fourth lens L4. In addition, the differences in optical power and shape are as follows: the first side surface S1 of the first lens L1 is convex, and the second side surface S2 is concave; the first side surface S3 of the second lens L2 is concave; the first side surface S5 of the third lens L3 is concave, and the second side surface S6 is convex; the first side surface S8 of the fourth lens L4 is concave, and the second side surface S9 is convex; the fifth lens L5 has positive optical power.

[0183] Table 23 shows the parameters of each lens of the optical lens of Example 12.

[0184] Table 23

[0185] Table 24 shows parameters of the aspheric lens that can be used in Example 12, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0186] Table 24

[0187] The MTF value of the optical lens of Example 12 at a spatial frequency of 50lp / mm exceeds 0.792. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.924μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 97.637%. The optical lens given in Example 12 has a high resolution.

[0188] Embodiment 13

[0189] The following reference Fig.13 Describe the optical lens according to Example 13 of the present application.

[0190] Fig.13 FIG. 1 is a schematic diagram of the structure of an optical lens of Example 13. Compared with Example 1, this embodiment is different from Example 1 in that the aperture position is set between the third lens L3 and the fourth lens L4. In addition, the differences in optical power and shape are as follows: the second side surface S6 of the third lens L3 is a convex surface; the first side surface S8 of the fourth lens L4 is a concave surface, and the second side surface S9 is a convex surface; the fifth lens L5 has positive optical power.

[0191] Table 25 shows the parameters of each lens of the optical lens of Example 13.

[0192] Table 25

[0193] Table 26 shows parameters of the aspheric lens that can be used in Example 13, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0194] Table 26

[0195] The MTF value of the optical lens of Example 13 at a spatial frequency of 50lp / mm exceeds 0.807. In terms of the RMS of the spot diagram, in the edge field of view, the root mean square radius of the light spot on the image plane is 2.361μm; in terms of the diffraction circle energy, within a circle with a diameter of 15μm on the image plane, the proportion of the light spot energy in the total light energy exceeds 98.379%. The optical lens given in Example 13 has a high resolution.

[0196] Table 27 below shows some parameters of the optical lenses of the above-mentioned Embodiments 1 to 13, such as the focal length F of the entire optical lens group, the entrance pupil diameter ENPD, the total optical length TTL, the maximum field of view angle FOV, the arc value θ corresponding to the maximum field of view angle, and the focal length of each lens, etc. Among them, the unit of each focal length value, distance or effective radius value is millimeter (mm), and the unit of FOV is degree (°).

[0197] Table 27

[0198] In summary, the optical lenses of the above-mentioned embodiments 1 to 13 satisfy the conditional formula shown in Table 28 below.

[0199] Table 28

[0200] Fig.14 , Fig.15 and Fig.16 The MTF curve diagrams of the optical lenses according to the fourth, ninth and thirteenth embodiments of the present application are shown respectively. The MTF curve diagram can be used to represent the imaging modulation degree of the lens at different spatial frequencies under each field of view. The horizontal axis represents the spatial frequency, and the vertical axis represents the MTF value, i.e., the OTF (Optical Transfer Function) modulus. Fig.14 , Fig.15 and Fig.16 It can be seen that the MTF value of the optical lens of the present application within the spatial frequency of 50lp / mm is greater than 0.5, and can even exceed 0.7 or 0.8, so it has a higher resolution capability and can achieve good imaging quality.

[0201] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application, and may also include at least one of an imaging element and a light source, wherein the imaging element is used to convert an optical image formed by the optical lens into an electrical signal; the light emitted by the light source is projected to the target area after passing through the optical lens to form an image or illuminate the area. The electronic device can be an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device can also be an independent imaging device such as a vehicle-mounted camera, or a projection module or imaging module integrated in a driving assistance system.

[0202] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: The optical lens includes, in sequence from the first side to the second side along the optical axis: a first lens having negative optical power; a second lens having negative optical power; a third lens having positive refractive power; a fourth lens having negative optical power; a fifth lens having optical power, wherein the first side surface is convex and the second side surface is concave; and a sixth lens having optical power, wherein the first side surface is convex and the second side surface is concave; wherein the number of lenses having optical power in the optical lens is six; The radius of curvature R10 of the second side surface of the fifth lens and the total optical length TTL of the optical lens satisfy: 0.09≤R10 / TTL≤2.82; A radius of curvature R12 of the second side surface of the sixth lens and a focal length F4 of the fourth lens satisfy: -0.41≤R12 / F4≤-0.

05.

2. The optical lens according to claim 1, characterized in that: The first side surface of the first lens is a concave surface, and the second side surface is a convex surface; or the first side surface is a convex surface, and the second side surface is a concave surface; or the first side surface is a concave surface, and the second side surface is a concave surface; The first side surface of the second lens is a concave surface, and the second side surface is a convex surface; or the first side surface is a convex surface, and the second side surface is a concave surface; or the first side surface is a concave surface, and the second side surface is a concave surface; The first side surface of the third lens is a concave surface, and the second side surface is a convex surface; or the first side surface is a convex surface, and the second side surface is a concave surface; or the first side surface is a convex surface, and the second side surface is a convex surface; The first side surface of the fourth lens is a concave surface, and the second side surface is a convex surface; or the first side surface is a convex surface, and the second side surface is a concave surface; or the first side surface is a concave surface, and the second side surface is a concave surface; The fifth lens has positive or negative optical power; The sixth lens has positive or negative power.

3. The optical lens according to claim 1 or 2, characterized in that: The optical lens further includes a diaphragm; the optical lens satisfies at least one of the following conditional expressions: 56.9°≤(FOV F) / H≤61.7°; 3.35≤TTL / F≤5.3; 0.2≤TTL / H / FOV×1°≤0.31; 0.25≤(F θ) / D≤0.44; 0.06≤D / H / FOV×1°≤0.13; 0.12≤D / H / F×1mm≤0.23; 0.9≤(H / 2) / (F tan(θ / 2))≤0.98; 1.79≤F / H≤2.0; 1.5≤TTL / DMAX≤3.4; 0.01≤F / ENPD / D×1mm≤0.06; 0.62≤DST / F≤2.5; 0.56≤F / ENPD≤1.24; Among them, FOV is the maximum field of view of the optical lens, F is the entire 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, θ is the radian value corresponding to the maximum field of view of the optical lens, DMAX is the maximum value of the maximum clear aperture of each optical surface of the first lens to the sixth lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, and DST is the effective aperture of the aperture.

4. The optical lens according to claim 1 or 2, characterized in that: The focal length F1 of the first lens and the focal length F of the entire optical lens group satisfy: -16.5≤F1 / F≤-1.

12.

5. The optical lens according to claim 1 or 2, characterized in that: The focal length F3 of the third lens and the focal length F of the entire optical lens group satisfy: 1.2≤F3 / F≤3.

8.

6. The optical lens according to claim 1 or 2, characterized in that: The optical lens meets at least one of the following conditions: 0.01≤R9 / R10≤2.4; 0.14≤R9 / TTL≤0.32; 0.01≤R9 / |F5|≤1.1; 0.01≤R10 / |F5|≤11.3; 0.5≤|F5| / F≤17; Among them, R9 is the curvature radius of the first side surface of the fifth lens, R10 is the curvature radius of the second side surface of the fifth lens, TTL is the total optical length of the optical lens, F5 is the focal length of the fifth lens, and F is the entire group focal length of the optical lens.

7. The optical lens according to claim 1 or 2, characterized in that: The optical lens meets at least one of the following conditions: 0.1≤R11 / R12≤2; 0.01≤R11 / TTL≤0.53; 0.03≤R12 / TTL≤0.86; 0.02≤R11 / |F6|≤1; 0.01≤R12 / |F6|≤4.5; 0.3≤|F6| / F≤18; Among them, R11 is the curvature radius of the first side surface of the sixth lens, R12 is the curvature radius of the second side surface of the sixth lens, TTL is the total optical length of the optical lens, F6 is the focal length of the sixth lens, and F is the entire group focal length of the optical lens.

8. The optical lens according to claim 1 or 2, characterized in that: The optical lens meets at least one of the following conditions: -0.85≤F / F1+F / F2≤-0.03; 0.0003≤T12 / TTL≤0.12; Among them, F is the focal length of the entire set of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and TTL is the total optical length of the optical lens.

9. The optical lens according to claim 1 or 2, characterized in that: A focal length F2 of the second lens, a center thickness CT2 of the second lens, and an air interval T23 between the second lens and the third lens on the optical axis satisfy: -18≤F2 / (CT2+T23)≤-0.

6.

10. The optical lens according to claim 1 or 2, characterized in that: The focal length F3 of the third lens and the focal length F4 of the fourth lens satisfy: -0.49≤F3 / F4≤-0.

12.

11. The optical lens according to claim 1 or 2, characterized in that: The focal length F4 of the fourth lens and the focal length F of the entire optical lens group satisfy: -14.1≤F4 / F≤-1.

7.

12. The optical lens according to claim 1 or 2, characterized in that: The focal length F2 of the second lens and the focal length F of the entire optical lens group satisfy: -13.72≤F2 / F≤-1.

45.

13. The optical lens according to claim 1 or 2, characterized in that: A curvature radius R9 of a first side surface of the fifth lens, a curvature radius R10 of a second side surface of the fifth lens, and a center thickness CT5 of the fifth lens satisfy: 0.01≤(R9-CT5) / R10≤1.

1.

14. The optical lens according to claim 1 or 2, characterized in that: A curvature radius R11 of a first side surface of the sixth lens, a curvature radius R12 of a second side surface of the sixth lens, and a center thickness CT6 of the sixth lens satisfy: 0.01≤(R11-CT6) / R12≤1.

5.

15. The optical lens according to claim 1 or 2, characterized in that: The back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.03≤BFL / TTL≤0.

19.

16. The optical lens according to claim 1 or 2, characterized in that: The maximum field of view FOV of the optical lens and the entire focal length F of the optical lens satisfy the following conditions: 1.6°≤FOV / F×1mm≤2.0°.

17. The optical lens according to claim 1 or 2, characterized in that: The optical lens further includes a diaphragm; the optical lens satisfies at least one of the following conditions: 57.9°≤(FOV F) / H≤60.7°;3.7≤TTL / F≤4.92;0.22≤TTL / H / FOV×1°≤0.29;1.8≤TTL / DMAX≤2.96;0.29≤(F θ) / D≤0.41; 0.07≤D / H / FOV×1°≤0.12;0.14≤D / H / F×1mm≤0.21;0.06≤BFL / TTL≤0.16;1.82≤F / H≤1.92;0.7≤F / ENPD≤1.1;0.02≤F / ENPD / D×1mm≤0.05;0.98≤DST / F≤2.04;0.91≤(H / 2) / (F tan(θ / 2))≤0.97;-11.58≤F1 / F≤-2.65;-11.41≤F2 / F≤-1.81;1.76≤F3 / F≤3.28;-11.49≤F4 / F≤-4.27;0.11≤R10 / TTL≤2.36;-0.34≤R12 / F4≤-0.07;0.05≤(R9-CT5) / R10≤0.71;0.01≤(R11-CT6) / R12≤1.032;0.09≤R9 / R10≤1.6;0.21≤R11 / R12≤1.5;0.17≤R9 / TTL≤0.28;0.1≤R11 / TTL≤0.42;0.13≤R12 / TTL≤0.66;0.07≤R9 / |F5|≤0.72;0.05≤R10 / |F5|≤7.3;0.12≤R11 / |F6|≤0.68;0.09≤R12 / |F6|≤3.1;-0.7≤F / F1+F / F2≤-0.19;-12.6≤F2 / (CT2+T23)≤-1.6;-0.42≤F3 / F4≤-0.19;1.5≤|F5| / F≤11.5;0.8≤|F6| / F≤11.6;0.001≤T12 / TTL≤0.08;1.7°≤FOV / F×1mm≤1.9°; Wherein, FOV is the maximum field of view of the optical lens, F is the focal length of the entire group 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, DMAX is the maximum value of the maximum clear aperture of each optical surface from the first lens to the sixth lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, BFL is the back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, DST is the effective aperture of the aperture, F1 is the focal length of the first lens, and F2 is the focal length of the second lens. wherein: F3 is the focal length of the third lens, F4 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, R9 is the curvature radius of the first side surface of the fifth lens, R10 is the curvature radius of the second side surface of the fifth lens, R11 is the curvature radius of the first side surface of the sixth lens, R12 is the curvature radius of the second side surface of the sixth lens, CT5 is the center thickness of the fifth lens, CT6 is the center thickness of the sixth lens, CT2 is the center thickness of the second lens, T12 is the air spacing between the first lens and the second lens on the optical axis, and T23 is the air spacing between the second lens and the third lens on the optical axis.

18. An electronic device, characterized in that: The optical lens according to any one of claims 1 to 17, further comprising at least one of an imaging element and a light source, wherein: The imaging element is used to convert the optical image formed by the optical lens into an electrical signal; The light emitted by the light source is projected onto the target area after passing through the optical lens to form an image or illuminate an area.

Images