Optical Lens and Electronic Device

Abstract

The present application discloses an optical lens and an electronic device. The optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens with a negative optical power; a second lens with a negative optical power; a third lens with a positive optical power; a fourth lens with a negative optical power; a fifth lens with an optical power, whose first side is convex and second side is concave; and a sixth lens with an optical power, whose first side is convex and second side is concave; wherein, the number of lenses with optical power in the optical lens is six; the radius of curvature R10 of the second side of the fifth lens and the overall optical length TTL of the optical lens satisfy: 0.09 ≤ R10 / TTL ≤ 2.82; the radius of curvature R12 of the second side of the sixth lens and the focal length F4 of the fourth lens satisfy: -0.41 ≤ R12 / F4 ≤ -0.05.

Description

Technical Field

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

[0002] In recent years, with the rapid development of automotive assisted driving technology, optical lenses have been increasingly widely used in automobiles, such as in-vehicle optical lenses or lidar lenses.

[0003] In an automotive autonomous driving assistance system, a lidar lens is a key device for detecting information around the vehicle. To meet the ever-growing usage requirements of the automotive autonomous driving assistance system, lidar lenses tend to be miniaturized and have a small F-number (FNO).

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

[0005] On the one hand, the present application provides an optical lens. The optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens with a negative focal power; a second lens with a negative focal power; a third lens with a positive focal power; a fourth lens with a negative focal power; a fifth lens with a focal power, whose first side is convex and second side is concave; and a sixth lens with a focal power, whose first side is convex and second side is concave; wherein, the number of lenses with a focal power in the optical lens is six; the radius of curvature R10 of the second side of the fifth lens and the total optical length TTL of the optical lens satisfy: 0.09 ≤ R10 / TTL ≤ 2.82; the radius of curvature R12 of the second side 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 further 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; the light emitted by the light source is projected onto a target area 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:

[0009] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 The schematic diagrams of the structures of the optical lenses according to Embodiments 1 to 13 of the present application are shown respectively;

[0010] Figure 14 , Figure 15and Figure 16 Schematically show the MTF curves of the optical lenses according to Embodiment 4, Embodiment 9, and Embodiment 13 of the present application respectively. Detailed implementation manners

[0011] 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 the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

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

[0013] In the drawings, for the sake of convenience of illustration, the thickness, dimensions, and shapes of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0014] 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.

[0015] It should be understood that the optical lens provided in the present application can be used for imaging, projection, and lidar lenses. When the optical lens provided in the present application is used as an imaging lens or a lidar receiving end lens, the "first side" involved in this article can refer to the object side, and the "second side" can refer to the image side. Light from the object side can be imaged on the image side, for example. Among them, the imaging lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security surveillance camera, etc.; when the optical lens provided in the present application is used as a projection lens or a radar transmitting end lens, the "first side" involved in this article can refer to the object side, and the "second side" can refer to the light source side. A light source can be provided on the second side of the optical lens. The light source can provide light with or without image information. The light from the light source side is projected onto the target area on the first side (object side) after passing through the optical lens, for example, an image can be formed or an area can be illuminated on the first side.

[0016] It should also be understood that the terms "comprising", "including", "having", "containing" and / or "including" when used in this specification denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0017] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0018] It should be noted that, without 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 drawings and in conjunction with the embodiments.

[0019] The features, principles and other aspects of the present application will be described in detail below.

[0020] In an exemplary embodiment, the optical lens may include, for example, six lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged in sequence along the optical axis from the first side to the second side.

[0021] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a lidar transmitting end lens. At this time, the second side of the optical lens can be the image source side, and the first side can be the object side. The image source surface of the optical lens is provided on the second side of the optical lens.

[0022] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, an in-vehicle camera lens or a lidar receiving end lens. At this time, the first side of the optical lens can be the object side, and the second side can be the image side. The light from the object side can be imaged on the image side. The imaging surface of the optical lens is provided on the second side of the optical lens.

[0023] In an exemplary embodiment, the optical lens may further include a photosensitive element provided on the second side. Optionally, the photosensitive element provided on the second side can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0024] In an exemplary embodiment, the first lens may have a negative optical power. Its first side is concave, and its second side is convex. The first lens having a negative optical power plays a role in diffusing light, collecting as much light as possible in a large field of view and entering the rear optical system, which is beneficial to achieving a large field of view angle. The shape of the first lens is meniscus and convex towards the second side, where the first side being concave is beneficial for receiving sufficient light, and the second side being convex can converge the light in front, increasing the optical path of the large-angle field of view.

[0025] In an exemplary embodiment, the first lens may have a negative optical power. Its first side is convex, and its second side is concave. The first lens having a negative optical power has a meniscus shape and is concave towards the second side. Among them, the first side being convex is beneficial for receiving light in a large field of view, and the second side being concave can make the light enter the system gently for imaging.

[0026] In an exemplary embodiment, the first lens may have a negative optical power. Its first side is concave, and its second side is concave. The first lens having a negative optical power has a double-concave shape, where the first side being concave is beneficial for receiving sufficient light, and the second side being concave can make the light enter the system gently for imaging.

[0027] In an exemplary embodiment, the second lens may have a negative optical power. Its first side is concave, and its second side is convex. The second lens having a negative optical power has a diverging effect on light, receiving the light passing through the first lens, making the height of the marginal field beam higher and the width wider, which is beneficial to improving the relative illuminance of the marginal field of view. The shape of the second lens is meniscus and convex towards the second side, where the first side being concave is beneficial for receiving sufficient light, and the second side being convex can converge the light in front, increasing the optical path of the large-angle field of view.

[0028] In an exemplary embodiment, the second lens may have a negative focal power, with its first side being convex and the second side being concave. The shape of the second lens is meniscus and concave towards the second side, where the convex first side is beneficial for receiving light from a large field of view, and the concave second side can smoothly incident the light into the system for imaging.

[0029] In an exemplary embodiment, the second lens may have a negative focal power, with its first side being concave and the second side being concave. The second lens has a negative focal power and is double concave in shape, where the concave first side is beneficial for receiving sufficient light, and the concave second side can smoothly incident the light into the system for imaging.

[0030] In an exemplary embodiment, the third lens may have a positive focal power, with its first side being concave and the second side being convex. The third lens has a positive focal power and, when paired with the second lens having a negative focal power, is beneficial for converging the light diffused by the second lens and further making the light path more stable. The shape of the third lens is meniscus and convex towards the second side, where the concave first side is beneficial for receiving sufficient light, and the convex second side can converge the light in front to increase the optical path of the large-angle field of view.

[0031] In an exemplary embodiment, the third lens may have a positive focal power, with its first side being convex and the second side being concave. The third lens has a positive focal power and is meniscus in shape and concave towards the second side, where the convex first side is beneficial for receiving light from a large field of view, and the concave second side can smoothly incident the light into the system for imaging.

[0032] In an exemplary embodiment, the third lens may have a positive focal power, with its first side being convex and the second side being convex. The third lens has a positive focal power and is double convex in shape, which is beneficial for converging the light in front and adjusting the light path, and the double convex structure makes it easier to adjust the light.

[0033] In an exemplary embodiment, the fourth lens may have a negative focal power, with its first side being concave and the second side being convex. The focal power of the fourth lens is negative, which is beneficial for slightly diverging the light converged by the front group, enabling the light to smoothly transition to the fifth lens and facilitating the realization of a long back focal length. The shape of the fourth lens is meniscus and convex towards the second side, where the concave first side is beneficial for receiving sufficient light, and the convex second side can converge the light in front to increase the optical path of the large-angle field of view.

[0034] In an exemplary embodiment, the fourth lens may have a negative focal power, with its first side being convex and the second side being concave. The focal power of the fourth lens is negative and is meniscus in shape and concave towards the second side, where the convex first side is beneficial for receiving light from a large field of view, and the concave second side can smoothly incident the light into the system for imaging.

[0035] In an exemplary embodiment, the fourth lens may have a negative focal power, with its first side being concave and its second side being concave. The fourth lens has a negative focal power and is in a biconcave shape. The fact that the first side is concave is conducive to receiving sufficient light, and the fact that the second side is concave allows the light to be incident on the system gently for imaging.

[0036] In an exemplary embodiment, the fifth lens may have a negative focal power, with its first side being convex and its second side being concave. The fifth lens has a negative focal power and diffuses the light, enabling the light to transition as smoothly as possible. The shape of the fifth lens is meniscus and concave towards the second side. The fact that the first side is convex is conducive to receiving light from a large field of view, and the fact that the second side is concave allows the light to be incident on the system gently for imaging.

[0037] In an exemplary embodiment, the fifth lens may have a positive focal power, with its first side being convex and its second side being concave. The fifth lens has a positive focal power and strengthens the converging effect on the light, making the light path of the rear group of light rays flat, which is conducive to achieving a small CRA (Chief Ray Angle) and better matching with various chips. The shape of the fifth lens is meniscus and concave towards the second side. The fact that the first side is convex is conducive to receiving light from a large field of view, and the fact that the second side is concave allows the light to be incident on the system gently for imaging.

[0038] In an exemplary embodiment, the sixth lens may have a positive focal power, with its first side being convex and its second side being concave. The sixth lens has a positive focal power and can receive the front-end light, which is conducive to improving the resolution. The shape of the sixth lens is meniscus and concave towards the second side. The fact that the first side is convex is conducive to receiving light from a large field of view, and the fact that the second side is concave allows the light to be incident on the system gently for imaging.

[0039] In an exemplary embodiment, the sixth lens may have a negative focal power, with its first side being convex and its second side being concave. The sixth lens has a negative focal power, which is conducive to making the light transition smoothly to the image plane. The shape of the sixth lens is meniscus and concave towards the second side. The fact that the first side is convex is conducive to receiving light from a large field of view, and the fact that the second side is concave allows the light to be incident on the system gently for imaging.

[0040] In an exemplary embodiment, a diaphragm may be provided in the optical lens. For example, the diaphragm may be provided between the third lens and the fourth lens, or the diaphragm may be provided between the fourth lens and the fifth lens. The setting of the diaphragm 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 diaphragm disclosed here is only an example and not a limitation; in alternative embodiments, the diaphragm may also be set at other positions according to actual needs.

[0041] 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.

[0042] 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.

[0043] In an exemplary embodiment, the optical lens according to the present application can satisfy: 56.9° ≤ (FOV * F) / H ≤ 61.7°, where FOV is the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. Meeting this conditional expression is conducive to the optical lens simultaneously satisfying characteristics such as long focal length, large field of view angle / large image height, and large angular resolution. More specifically, the optical lens can further satisfy: 57.9° ≤ (FOV F) / H ≤ 60.7°, which is conducive to the optical lens further satisfying characteristics such as long focal length, large field of view angle / large image height, and large angular resolution.

[0044] In an exemplary embodiment, the optical lens according to the present application can satisfy: 3.35 ≤ TTL / F ≤ 5.3. Meeting this conditional expression can achieve a small TTL while ensuring the optical power, thereby meeting the miniaturization of the optical system. More specifically, the optical lens can further satisfy: 3.7 ≤ TTL / F ≤ 4.92, which is conducive to further achieving the miniaturization of the optical system while ensuring the optical power.

[0045] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.2 ≤ TTL / H / FOV × 1° ≤ 0.31. Meeting this conditional expression can effectively limit the length of the lens under the condition of a certain image height and field of view angle, thereby achieving the miniaturization of the lens. More specifically, the optical lens can further satisfy: 0.22 ≤ TTL / H / FOV × 1° ≤ 0.29, which is conducive to further limiting the length of the lens, thereby achieving the miniaturization of the lens.

[0046] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.5 ≤ TTL / DMAX ≤ 3.4, where DMAX is the maximum value among the maximum clear apertures of each optical surface from the first lens to the sixth lens. Meeting this conditional expression, under the condition of a certain maximum clear aperture, by controlling the overall optical length, the entire optical system can be made more compact, which is conducive to miniaturization. More specifically, the optical lens can further satisfy: 1.8 ≤ TTL / DMAX ≤ 2.96, which is conducive to further achieving the miniaturization of the optical system.

[0047] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.25 ≤ (F θ) / D ≤ 0.44, where θ is the radian value corresponding to the maximum field of view angle of the optical lens, and D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens. Meeting this conditional expression and controlling the ratio of the overall focal length, field of view angle, and clear aperture of the optical lens can make the front aperture of the lens smaller, reducing the volume of the imaging system of the lens. More specifically, the optical lens can further satisfy: 0.29 ≤ (F θ) / D ≤ 0.41 is beneficial for further controlling the smaller front aperture of the lens and reducing the volume of the lens imaging system.

[0048] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.06 ≤ D / H / FOV × 1° ≤ 0.13. Satisfying this conditional expression, when the image height and the field of view angle are fixed, by controlling the size of the light passing aperture, it is beneficial to make the front aperture small, thereby achieving miniaturization. More specifically, the optical lens can further satisfy: 0.07 ≤ D / H / FOV × 1° ≤ 0.12, which is beneficial for further controlling the smaller front aperture of the lens and achieving miniaturization.

[0049] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.12 ≤ D / H / F × 1mm ≤ 0.23. Satisfying this conditional expression, under the condition of a fixed focal length, by controlling the ratio of the light passing aperture to the image height, it is beneficial to provide a large target surface for the lens and achieve the characteristic of a small aperture. More specifically, the optical lens can further satisfy: 0.14 ≤ D / H / F × 1mm ≤ 0.21, which is beneficial for further providing a large target surface for the lens and achieving the characteristic of a small aperture.

[0050] In an exemplary embodiment, the optical lens according to the present application can 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 expression can meet the special requirement of the short back focal length of the optical lens, while ensuring the installation space of the components and the reserved space for focusing, and reducing the total length of the system, which is beneficial for miniaturization. More specifically, the optical lens can further satisfy: 0.06 ≤ BFL / TTL ≤ 0.16, which is beneficial for further meeting the short back focal length of the optical lens while ensuring the miniaturization of the system.

[0051] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.79 ≤ F / H ≤ 2.0. Satisfying this conditional expression can control the focal length and the image height within a certain range, which is beneficial for improving the resolution. More specifically, the optical lens can further satisfy: 1.82 ≤ F / H ≤ 1.92, which is beneficial for further improving the resolution.

[0052] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.56 ≤ F / ENPD ≤ 1.24, where ENPD is the entrance pupil diameter of the optical lens. Satisfying this conditional expression is beneficial for achieving a small FNO and increasing the light passing amount. More specifically, the optical lens can further satisfy: 0.7 ≤ F / ENPD ≤ 1.1, which is beneficial for further achieving a small FNO and increasing the light passing amount.

[0053] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.01 ≤ F / ENPD / D×1mm ≤ 0.06. Satisfying this conditional expression is beneficial to ensuring a small aperture while meeting the requirement of high light throughput, thereby realizing miniaturization of the lens. More specifically, the optical lens can further satisfy: 0.02 ≤ F / ENPD / D×1mm ≤ 0.05, which is beneficial to further ensuring a small aperture while meeting the requirement of high light throughput, and realizing miniaturization of the lens.

[0054] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.62 ≤ DST / F ≤ 2.5, where DST is the effective aperture of the diaphragm. Satisfying this conditional expression, by controlling the ratio of the diaphragm aperture to the effective focal length of the system to be relatively large, the corresponding lens aperture is larger, further realizing high light throughput. More specifically, the optical lens can further satisfy: 0.98 ≤ DST / F ≤ 2.04, which is beneficial to further realizing high light throughput.

[0055] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.9 ≤ (H / 2) / (F tan(θ / 2)) ≤ 0.98. Satisfying this conditional expression, by controlling the ratio of the actual image height to the ideal image height, high angular resolution is achieved. More specifically, the optical lens can further satisfy: 0.91 ≤ (H / 2) / (F tan(θ / 2)) ≤ 0.97, which is beneficial to further achieving high angular resolution.

[0056] In an exemplary embodiment, the optical lens according to the present application can satisfy: -16.5 ≤ F1 / F ≤ -1.12, where F1 is the focal length of the first lens. Satisfying this conditional expression, the focal length of the first lens is reasonably allocated so that the focal length of the first lens is negative and has a relatively large value, which is beneficial to the smooth transition and diffusion of light, thereby increasing the light input of the system and finally realizing a small FNO. More specifically, the optical lens can further satisfy: -11.58 ≤ F1 / F ≤ -2.65, which is beneficial to further smooth transition and diffusion of light, thereby increasing the light input of the system and finally realizing a small FNO.

[0057] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.2 ≤ F3 / F ≤ 3.8, where F3 is the focal length of the third lens. Satisfying this conditional expression, the third lens is controlled to be positive and by reasonably allocating the focal length of the third lens, the diverging light in front is converged, increasing the optical path of the light in the edge field of view, thereby improving the image quality. More specifically, the optical lens can further satisfy: 1.76 ≤ F3 / F ≤ 3.28, which is beneficial to the third lens further converging the diverging light in front, increasing the optical path of the light in the edge field of view, and improving the image quality.

[0058] 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. By satisfying this conditional expression and reasonably allocating the focal length of the fourth lens, such that the focal length of the fourth lens is negative and has a relatively large value, the light that has been converged in the front can be smoothly transitioned and diffused, thereby increasing the light input amount of the system and ultimately achieving a small FNO. More specifically, the optical lens may further satisfy: -11.49 ≤ F4 / F ≤ -4.27, which is conducive to the fourth lens further smoothly transitioning and diffusing the light that has been converged in the front, thereby further increasing the light input amount of the system and ultimately achieving a small FNO.

[0059] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ (R9 - CT5) / R10 ≤ 1.1, where R9 is the radius of curvature of the first side surface of the fifth lens, CT5 is the central thickness of the fifth lens, and R10 is the radius of curvature of the second side surface of the fifth lens. By satisfying this conditional expression, controlling the shape of the fifth lens to be meniscus, and reasonably controlling the ratio relationship of the radius of curvature of its first side surface, central thickness, and the radius of curvature of the second side surface, the light can be made to transition smoothly as much as possible, which is conducive to reducing the sensitivity of the system and improving 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, conducive to further reducing the sensitivity of the system and improving the resolution.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ (R11 - CT6) / R12 ≤ 1.5, where R11 is the radius of curvature of the first side surface of the sixth lens, R12 is the radius of curvature of the second side surface of the sixth lens, and CT6 is the central thickness of the sixth lens. By satisfying this conditional expression, controlling the shape of the sixth lens to be meniscus, and reasonably controlling the ratio relationship of the radius of curvature of its first side surface, central thickness, and the radius of curvature of the second side surface, the light can be made to transition smoothly as much as possible, which is conducive to reducing the sensitivity of the system and improving 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, conducive to further reducing the sensitivity of the system and improving the resolution.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ R9 / R10 ≤ 2.4. Meeting this conditional expression makes the fifth lens in a meniscus shape with the same orientation of both side surfaces, converging the overall light beam. When the ratio of the R values on both sides is controlled within this range, the central spherical aberration, marginal 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 can further effectively reduce the central spherical aberration, marginal field curvature, and astigmatism values introduced by the fifth lens as a whole, thereby improving the image quality.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1 ≤ R11 / R12 ≤ 2. Meeting this conditional expression makes the sixth lens in a meniscus shape with the same orientation of both side surfaces, converging the overall light beam. When the ratio of the R values on both sides is controlled within this range, the central spherical aberration, marginal 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 can further effectively reduce the central spherical aberration, marginal field curvature, and astigmatism values introduced by the sixth lens as a whole, thereby improving the image quality.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.14 ≤ R9 / TTL ≤ 0.32. Meeting this conditional expression controls the ratio of the curvature radius of the first side surface of the fifth lens to the overall optical length, deflecting the received light inward, which is beneficial for reducing the rear port diameter and achieving miniaturization. More specifically, the optical lens may further satisfy: 0.17 ≤ R9 / TTL ≤ 0.28, which is beneficial for further reducing the rear port diameter and achieving miniaturization.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ R11 / TTL ≤ 0.53. Meeting this conditional expression controls the ratio of the curvature radius of the first side surface of the sixth lens to the overall optical length, deflecting the received light passing through the sixth lens inward, which is beneficial for reducing the rear port diameter and achieving miniaturization. More specifically, the optical lens may further satisfy: 0.1 ≤ R11 / TTL ≤ 0.42, which is beneficial for further reducing the rear port diameter and achieving miniaturization.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03 ≤ R12 / TTL ≤ 0.86. Meeting this conditional expression controls the ratio of the curvature radius of the second side surface of the sixth lens to the overall optical length, enabling the light to enter as smoothly as possible, which is beneficial for the low sensitivity of the system and improving the resolution. More specifically, the optical lens may further satisfy: 0.13 ≤ R12 / TTL ≤ 0.66, which is beneficial for further reducing the system sensitivity and improving the resolution.

[0066] 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 expression and controlling the ratio of the curvature radius of the first side surface of the fifth lens to the focal length of the fifth lens, light can be converged, more light can be collected and entered, and the resolution can be improved. More specifically, the optical lens may further satisfy: 0.07 ≤ R9 / |F5| ≤ 0.72, which is beneficial for further converging light, collecting more light and entering, and improving the resolution.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ R10 / |F5| ≤ 11.3. By satisfying this conditional expression and controlling the ratio of the curvature radius of the second side surface of the fifth lens to the focal length of the fifth lens, the light can enter as smoothly as possible, which is beneficial for 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 for 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: 0.02 ≤ R11 / |F6| ≤ 1, where F6 is the focal length of the sixth lens. By satisfying this conditional expression and controlling the ratio of the curvature radius of the first side surface of the sixth lens to the focal length of the sixth lens, it is beneficial for converging light and improving the resolution. More specifically, the optical lens may further satisfy: 0.12 ≤ R11 / |F6| ≤ 0.68, which is beneficial for the sixth lens to further converge light and improve the resolution.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 ≤ R12 / |F6| ≤ 4.5. By satisfying this conditional expression and controlling the ratio of the curvature radius of the second side surface of the sixth lens to the focal length of the fifth lens, the light can enter as smoothly as possible, which is beneficial for 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 for further reducing the sensitivity of the system and improving the resolution.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.85 ≤ F / F1 + F / F2 ≤ -0.03. By satisfying this conditional expression and controlling the sum of the ratios of the focal lengths of the first lens and the second lens to the total focal length, the light passing through the first lens and the second lens in the front group can be smoothly transitioned and diffused, thereby increasing the light input of the system and finally achieving a small FNO. More specifically, the optical lens may further satisfy: -0.7 ≤ F / F1 + F / F2 ≤ -0.19, which is beneficial for further increasing the light input of the system and finally achieving a small FNO.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: -18 ≤ F2 / (CT2 + T23) ≤ -0.6, where CT2 is the central 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 along the optical axis from the second side surface of the second lens to the first side surface of the third lens. By satisfying this conditional formula and controlling the ratio relationship between the focal length of the second lens and the sum of the central thickness of the second lens and the air gap between the second lens and the third lens, the light rays emitted from 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, which can further control the smooth transition of the light rays emitted from the second lens, and is beneficial to further ensuring the low sensitivity of the system and improving the resolution.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.49 ≤ F3 / F4 ≤ -0.12. By satisfying this conditional formula and controlling the focal length ratio of the third lens and the fourth lens, the light rays converged by the third lens and the fourth 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: -0.42 ≤ F3 / F4 ≤ -0.19, which is beneficial to further ensuring the low sensitivity of the system and improving the resolution.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5 ≤ |F5| / F ≤ 17. By satisfying this conditional formula and reasonably allocating the focal length of the fifth lens, the light rays passing through the fifth lens can be smoothly transitioned, and the resolution is improved. More specifically, the optical lens may further satisfy: 1.5 ≤ |F5| / F ≤ 11.5, which is beneficial to further smoothly transitioning the light rays passing through the fifth lens and improving the resolution.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.3 ≤ |F6| / F ≤ 18. By satisfying this conditional formula and reasonably allocating the focal length of the sixth lens, the light rays passing through the sixth lens can be smoothly transitioned, and the resolution is improved. More specifically, the optical lens may further satisfy: 0.8 ≤ |F6| / F ≤ 11.6, which is beneficial to further smoothly transitioning the light rays passing through the sixth lens and improving the resolution.

[0075] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.0003 ≤ T12 / TTL ≤ 0.12, where T12 is the air gap between the first lens and the second lens on the optical axis, that is, the distance along the optical axis from the second side surface of the first lens to the first side surface of the second lens. By satisfying this conditional formula and controlling the distance between the first lens and the second lens, the light rays can diverge rapidly, effectively limiting the length of the lens and facilitating the miniaturization of the lens. More specifically, the optical lens can further satisfy: 0.001 ≤ T12 / TTL ≤ 0.08, which is beneficial for further realizing the miniaturization of the lens.

[0076] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.6° ≤ FOV / F×1mm ≤ 2.0°. By satisfying this conditional formula and controlling the ratio of the field of view angle to the overall focal length of the optical lens, long-distance detection can be achieved. More specifically, the optical lens can further satisfy: 1.7° ≤ FOV / F×1mm ≤ 1.9°, which is beneficial for further realizing long-distance detection.

[0077] Through reasonable settings of the number of lenses, the shapes and optical powers of each lens, the optical lens according to the above embodiments of the present application can meet the requirements of small FNO, high light throughput, high resolution, etc. while satisfying the miniaturization of the system.

[0078] In an exemplary embodiment, at least one surface of each optical surface of the first lens to the sixth lens of the optical lens has an anastigmatism. The setting of anastigmatism is beneficial for further correcting light rays, enabling the light rays to transition smoothly to the next surface, and anastigmatism can correct the angles of marginal light rays, reduce marginal 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 anastigmatism point. The setting of the anastigmatism point is beneficial for better correcting the aberration of the light rays emitted from different fields of view on the premise of maintaining the overall shape of the lens.

[0079] In an exemplary embodiment, according to needs, 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 surface to filter light rays with different wavelengths and prevent damage to the image-side elements (such as chips) of the optical lens.

[0080] In an exemplary embodiment, the first lens to the sixth lens can be spherical lenses or aspherical lenses. 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 continuously changes from the center to the periphery of the lens. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging 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 reflecting the imaging quality, the number of aspherical lenses can be increased, or even all lenses can be aspherical lenses.

[0081] In an exemplary embodiment, the sixth lens may be an aspherical lens, or both the fifth lens and the sixth lens may be aspherical lenses. Since different positions of an aspherical lens have different curvatures, the light path can be adjusted to converge onto the image plane, which can better correct aberration and improve resolution. It should be emphasized that, according to actual needs, other lenses may also adopt aspherical surfaces.

[0082] In an exemplary embodiment, the first lens to the sixth lens 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 lens to the sixth lens may all be glass aspherical lenses. An optical lens made of glass can suppress the shift of the back focal length of the imaging system components with temperature changes, so as to improve system stability. At the same time, using glass material can avoid problems such as blurred imaging of the lens and affecting the normal use of the lens caused by high and low temperature changes in the use environment. Of course, the first lens to the sixth lens of the optical lens may also be made of a combination of plastic and glass. Of course, in application scenarios with lower requirements for temperature stability, the first lens to the sixth lens in the optical lens may also be all made of plastic. Making an optical lens with plastic can effectively reduce the manufacturing cost.

[0083] However, those skilled in the art should understand that, without departing from the technical solutions 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.

[0084] The following further describes specific embodiments of an optical lens applicable to the above embodiments with reference to the accompanying drawings.

[0085] Embodiment 1

[0086] The following refers to Figure 1 Describe the optical lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical lens according to Embodiment 1 of the present application is shown.

[0087] As Figure 1 shown, the optical lens sequentially 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 along the optical axis from the first side to the second side.

[0088] 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.

[0089] The first lens L1 has a negative optical power, its first side S1 is concave, and its second side S2 is convex. The second lens L2 has a negative optical power, its first side S3 is convex, and its second side S4 is concave. The third lens L3 has a positive optical power, its first side S5 is convex, and its second side S6 is concave. The fourth lens L4 has a negative optical power, its first side S7 is convex, and its second side S8 is concave. The fifth lens L5 has a negative optical power, its first side S10 is convex, and its second side S11 is concave. The sixth lens L6 has a positive optical power, its first side S12 is convex, and its second side S13 is concave.

[0090] 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 surface (or image source surface) IMA. The filter L7 has a first side S14 and a second side S15, and the protective glass L8 has a first side S16 and a second side S17.

[0091] When IMA is the imaging surface, the light from the object sequentially passes through the surfaces S1 to S17 and finally forms an image on IMA. When IMA is the image source surface, the light from IMA sequentially passes through the surfaces S17 to S1 and finally projects onto the object.

[0092] Table 1 shows the radius of curvature R, thickness / distance, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of Embodiment 1.

[0093] Table 1

[0094]

[0095] In this embodiment, the first side S10 and the second side S11 of the fifth lens L5 of the optical lens, and the first side S12 and the second side S13 of the sixth lens L6 are aspherical mirror surfaces, and the surface types of the aspherical mirror surfaces can be defined by, but not limited to, the following aspherical formula (1).

[0096] (1)

[0097] Where x is the sagitta of the aspherical surface along the optical axis at a position with a height of h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c =1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i -th order correction coefficient of the aspherical surface.

[0098] Table 2 shows the parameters of the aspherical mirror surfaces that can be used in this embodiment. Among them, each aspherical surface type can be defined by formula (1) given in Embodiment 1 above.

[0099] Table 2

[0100]

[0101] The MTF (Modulation Transfer Function) value of the optical lens of Embodiment 1 at a spatial frequency of 50 lp / mm (cycles / mm) exceeds 0.607. In terms of the RMS (Root Mean Square Radius) of the spot diagram, at the edge field of view, the RMS radius of the spot on the image plane is 4.221 μm; in terms of the energy entering the diffraction circle, 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 given in Embodiment 1 has a high resolving power.

[0102] Embodiment 2

[0103] The following refers to Figure 2 Describe the optical lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted.

[0104] Figure 2 Shown is a schematic structural diagram of the optical lens of Embodiment 2. Compared with Embodiment 1, the difference in optical power and shape is that the first side surface S3 of the second lens L2 is a concave surface.

[0105] Table 3 shows the parameters of each lens of the optical lens of Embodiment 2.

[0106] Table 3

[0107]

[0108] Table 4 shows the parameters of the aspherical lenses that can be used in Embodiment 2. Among them, each aspherical surface type can be defined by formula (1) given in Embodiment 1 above.

[0109] Table 4

[0110]

[0111] The MTF value of the optical lens of Example 2 at a spatial frequency of 50 lp / mm exceeds 0.688. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 4.008 μm; in terms of the energy entering the diffraction circle, 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 98.266%. The optical lens given in Example 2 has a high resolving power.

[0112] Example 3

[0113] The following refers to Figure 3 Describe the optical lens according to Embodiment 3 of the present application.

[0114] Figure 3 Shown is a schematic structural diagram of the optical lens of Example 3. Compared with Example 1, the differences in optical power and shape are as follows: the second side S2 of the first lens L1 is concave; the first side S3 of the second lens L2 is concave, and the second side S4 is convex; the second side S6 of the third lens L3 is convex.

[0115] Table 5 shows the parameters of each lens of the optical lens of Example 3.

[0116] Table 5

[0117]

[0118] Table 6 shows the parameters of the aspherical lenses that can be used in Example 3. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0119] Table 6

[0120]

[0121] The MTF value of the optical lens of Example 3 at a spatial frequency of 50 lp / mm exceeds 0.766. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.620 μm; in terms of the energy entering the diffraction circle, 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 97.649%. The optical lens given in Example 3 has a high resolving power.

[0122] Example 4

[0123] The following refers to Figure 4 Describe the optical lens according to Embodiment 4 of the present application.

[0124] Figure 4The following is a schematic structural diagram of the optical lens according to Embodiment 4. Compared with Embodiment 1, the differences in optical power and shape are as follows: the first side S1 of the first lens L1 is a convex surface, and the second side S2 is a concave surface; the first side S3 of the second lens L2 is a concave surface, and the second side S4 is a convex surface; the second side S6 of the third lens L3 is a convex surface.

[0125] Table 7 shows the parameters of each lens of the optical lens according to Embodiment 4.

[0126] Table 7

[0127]

[0128] Table 8 shows the parameters of the aspherical lenses that can be used in Embodiment 4. Among them, each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0129] Table 8

[0130]

[0131] The MTF value of the optical lens according to Embodiment 4 exceeds 0.762 at a spatial frequency of 50 lp / mm. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.416 μm; in terms of the energy entering the diffraction circle, 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 97.773%. The optical lens given in Embodiment 4 has a high resolution.

[0132] Embodiment 5

[0133] The following is a reference Figure 5 to describe the optical lens according to Embodiment 5 of the present application.

[0134] Figure 5 The following is a schematic structural diagram of the optical lens according to Embodiment 5. Compared with Embodiment 1, the differences in optical power and shape are as follows: the first side S3 of the second lens L2 is a concave surface, and the second side S4 is a convex surface; the first side S5 of the third lens L3 is a concave surface, and the second side S6 is a convex surface.

[0135] In this embodiment, the second side S11 of the fifth lens L5 has an inflection point.

[0136] Table 9 shows the parameters of each lens of the optical lens according to Embodiment 5.

[0137] Table 9

[0138]

[0139] Table 10 shows the parameters of the aspherical lenses that can be used in Example 5. Among them, each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0140] Table 10

[0141]

[0142] The MTF value of the optical lens of Example 5 at a spatial frequency of 50 lp / mm exceeds 0.596. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 5.710 μm; in terms of the energy entering the diffraction circle, 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 97.590%. The optical lens given in Example 5 has a high resolving power.

[0143] Example 6

[0144] The following refers to Figure 6 Describe the optical lens according to Embodiment 6 of the present application.

[0145] Figure 6 The structural schematic diagram of the optical lens of Example 6 is shown. Compared with Example 1, the differences in optical power and shape are as follows: the first side S3 of the second lens L2 is concave, and the second side S4 is convex; the first side S5 of the third lens L3 is concave, and the second side S6 is convex; the first side S7 of the fourth lens L4 is concave, and the second side S8 is convex; the fifth lens L5 has a positive optical power; the sixth lens L6 has a negative optical power.

[0146] Table 11 shows the parameters of each lens of the optical lens of Example 6.

[0147] Table 11

[0148]

[0149] Table 12 shows the parameters of the aspherical lenses that can be used in Example 6. Among them, each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0150] Table 12

[0151]

[0152] The MTF value of the optical lens of Example 6 at a spatial frequency of 50 lp / mm exceeds 0.621. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 5.023 μm; in terms of the energy entering the diffraction circle, 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 97.975%. The optical lens given in Example 6 has a high resolving power.

[0153] Example 7

[0154] The following refers to Figure 7 Describe the optical lens according to Example 7 of the present application.

[0155] Figure 7 The structural schematic diagram of the optical lens of Example 7 is shown. Compared with Example 1, the differences in optical power and shape are as follows: the second side S2 of the first lens L1 is concave; the first side S3 of the second lens L2 is concave and the second side S4 is convex; the second side S6 of the third lens L3 is convex; the first side S7 of the fourth lens L4 is concave and the second side S8 is convex; the fifth lens L5 has positive optical power; the sixth lens L6 has negative optical power.

[0156] In this embodiment, the first side S12 of the sixth lens L6 has an inflection point.

[0157] Table 13 shows the parameters of each lens of the optical lens of Example 7.

[0158] Table 13

[0159]

[0160] Table 14 shows the parameters of the aspherical lenses that can be used in Example 7. Among them, each aspherical surface type can be defined by formula (1) given in the above Example 1.

[0161] Table 14

[0162]

[0163] The MTF value of the optical lens of Example 7 exceeds 0.778 at a spatial frequency of 50 lp / mm. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.756 μm; in terms of the energy entering the diffraction circle, 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 97.740%. The optical lens given in Example 7 has a high resolution.

[0164] Example 8

[0165] The following refers to Figure 8 Describe the optical lens according to Example 8 of the present application.

[0166] Figure 8The structural schematic diagram of the optical lens of Embodiment 8 is shown. Compared with Embodiment 1, the differences in optical power and shape are as follows: The first side S1 of the first lens L1 is a convex surface, and the second side S2 is a concave surface; the first side S3 of the second lens L2 is a concave surface; the first side S7 of the fourth lens L4 is a concave surface, and the second side S8 is a convex surface; the fifth lens L5 has a positive optical power; the sixth lens L6 has a negative optical power.

[0167] Table 15 shows the parameters of each lens of the optical lens of Embodiment 8.

[0168] Table 15

[0169]

[0170] Table 16 shows the parameters of the aspherical lenses that can be used in Embodiment 8. Among them, each aspherical surface type can be defined by formula (1) given in Embodiment 1 above.

[0171] Table 16

[0172]

[0173] The MTF value of the optical lens of Embodiment 8 at a spatial frequency of 50 lp / mm exceeds 0.591. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 6.623 μm; in terms of the energy entering the diffraction circle, 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 97.223%. The optical lens given in Embodiment 8 has a high resolution.

[0174] Embodiment 9

[0175] The following refers to Figure 9 Describe the optical lens according to Embodiment 9 of the present application.

[0176] Figure 9 The structural schematic diagram of the optical lens of Embodiment 9 is shown. Compared with Embodiment 1, the differences in optical power and shape are as follows: The first side S7 of the fourth lens L4 is a concave surface, and the second side S8 is a convex surface; the fifth lens L5 has a positive optical power; the sixth lens L6 has a negative optical power.

[0177] Table 17 shows the parameters of each lens of the optical lens of Embodiment 9.

[0178] Table 17

[0179]

[0180] Table 18 shows the parameters of the aspherical lenses that can be used in Embodiment 9. Among them, each aspherical surface type can be defined by formula (1) given in Embodiment 1 above.

[0181] Table 18

[0182]

[0183] The MTF value of the optical lens of Example 9 at a spatial frequency of 50 lp / mm exceeds 0.838. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.163 μm; in terms of the energy entering the diffraction circle, 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 98.309%. The optical lens given in Example 9 has a high resolution.

[0184] Example 10

[0185] The following refers to Figure 10 Describe the optical lens according to Embodiment 10 of the present application.

[0186] Figure 10 The structural schematic diagram of the optical lens of Example 10 is shown. Compared with Example 1, the differences in optical power and shape are as follows: the first side S3 of the second lens L2 is concave, and the second side S4 is convex; the first side S7 of the fourth lens L4 is concave; the fifth lens L5 has a positive optical power; the sixth lens L6 has a negative optical power.

[0187] Table 19 shows the parameters of each lens of the optical lens of Example 10.

[0188] Table 19

[0189]

[0190] Table 20 shows the parameters of the aspherical lenses that can be used in Example 10. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0191] Table 20

[0192]

[0193] The MTF value of the optical lens of Example 10 at a spatial frequency of 50 lp / mm exceeds 0.519. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 7.852 μm; in terms of the energy entering the diffraction circle, 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 98.803%. The optical lens given in Example 10 has a high resolution.

[0194] Example 11

[0195] The following refers to Figure 11Describe the optical lens according to Embodiment 11 of the present application.

[0196] Figure 11 The structural schematic diagram of the optical lens of Embodiment 11 is shown. Compared with Embodiment 1, what is different from Embodiment 1 is that the diaphragm 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 S2 of the first lens L1 is concave; the first side S3 of the second lens L2 is concave, and the second side S4 is convex; the second side S6 of the third lens L3 is convex; the fifth lens L5 has positive optical power.

[0197] Table 21 shows the parameters of each lens of the optical lens of Embodiment 11.

[0198] Table 21

[0199]

[0200] Table 22 shows the parameters of the aspherical lenses that can be used in Embodiment 11. Among them, each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0201] Table 22

[0202]

[0203] The MTF value of the optical lens of Embodiment 11 at a spatial frequency of 50 lp / mm exceeds 0.746. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 3.487 μm; in terms of the energy entering the diffraction circle, 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 97.711%. The optical lens given in Embodiment 11 has high resolution.

[0204] Embodiment 12

[0205] The following refers to Figure 12 Describe the optical lens according to Embodiment 12 of the present application.

[0206] Figure 12 The structural schematic diagram of the optical lens of Embodiment 12 is shown. Compared with Embodiment 1, what is different from Embodiment 1 is that the diaphragm 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 S1 of the first lens L1 is convex, and the second side S2 is concave; the first side S3 of the second lens L2 is concave; the first side S5 of the third lens L3 is concave, and the second side S6 is convex; the first side S8 of the fourth lens L4 is concave, and the second side S9 is convex; the fifth lens L5 has positive optical power.

[0207] Table 23 shows the parameters of each lens of the optical lens of Example 12.

[0208] Table 23

[0209]

[0210] Table 24 shows the parameters of the aspherical lenses that can be used in Example 12. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0211] Table 24

[0212]

[0213] The MTF value of the optical lens of Example 12 at a spatial frequency of 50 lp / mm exceeds 0.792. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.924 μm; in terms of the energy entering the diffraction circle, 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 97.637%. The optical lens given in Example 12 has a high resolving power.

[0214] Example 13

[0215] The following refers to Figure 13 Describe the optical lens according to Embodiment 13 of the present application.

[0216] Figure 13 Shown is a schematic structural diagram of the optical lens of Example 13. Compared with Example 1, what is different from Example 1 is that the aperture stop is arranged 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 S6 of the third lens L3 is convex; the first side S8 of the fourth lens L4 is concave, and the second side S9 is convex; the fifth lens L5 has a positive optical power.

[0217] Table 25 shows the parameters of each lens of the optical lens of Example 13.

[0218] Table 25

[0219]

[0220] Table 26 shows the parameters of the aspherical lenses that can be used in Example 13. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0221] Table 26

[0222]

[0223] The MTF value of the optical lens of Embodiment 13 at a spatial frequency of 50 lp / mm exceeds 0.807. In terms of the RMS of the spot diagram, at the edge field of view, the root mean square radius of the spot on the image plane is 2.361 μm; in terms of the energy entering the diffraction circle, 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 98.379%. The optical lens given in Embodiment 13 has a high resolution.

[0224] Table 27 below shows some parameters of the optical lenses of the above Embodiments 1 to 13, such as the overall focal length F of the optical lens, the entrance pupil diameter ENPD, the overall optical length TTL, the maximum field of view angle FOV, the radian value θ corresponding to the maximum field of view angle, and the focal lengths of each lens, etc. Among them, the units of each focal length value, distance or effective radius value are all millimeters (mm), and the unit of FOV is degrees (°).

[0225] Table 27

[0226]

[0227] In summary, the optical lenses of the above Embodiments 1 to 13 satisfy the conditional expressions shown in Table 28 below.

[0228] Table 28

[0229]

[0230] Figure 14 、 Figure 15 and Figure 16 respectively show schematic diagrams of the MTF curves of the optical lenses according to Embodiment 4, Embodiment 9, and Embodiment 13 of the present application. The MTF curve diagram can be used to represent the modulation of the lens imaging at different spatial frequencies in each field of view. In the figure, the horizontal axis represents the spatial frequency, and the vertical axis represents the MTF value, that is, the modulus value of the OTF (Optical Transfer Function). From Figure 14 、 Figure 15 and Figure 16 it can be known that the MTF values of the optical lenses of the present application within a spatial frequency of 50 lp / mm are all greater than 0.5, and can even exceed 0.7 or 0.8. Therefore, they have high resolution capabilities and can achieve good imaging quality.

[0231] The present application also provides an electronic device, which may include an optical lens according to the above embodiments of the present application, and may further include at least one of an imaging element and a light source. The imaging element is configured to convert an optical image formed by the optical lens into an electrical signal; the light emitted by the light source is projected onto a target area through the optical lens to form an image or illuminate the area. The electronic device may be an independent electronic device such as a detection distance camera, or an imaging module integrated on a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or a projection module or an imaging module integrated on an assisted driving system.

[0232] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. 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 the specific combination of the above technical features, and 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 technical solution formed by mutually replacing the above features with the technical features (but not limited to) having 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; The 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; 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.

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; Wherein, F is the focal length of the entire optical lens set, F1 is the focal length of the first lens, F2 is the focal length of the second lens, T12 is the air distance between the first lens and the second lens on the optical axis, 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 F2 of the second lens and the focal length F of the entire optical lens group satisfy: -13.72≤F2 / F≤-1.

45.

12. 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.

13. 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.

14. 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.

15. 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°.

16. 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, F2 is the focal length of the second lens, and F3 is the focal length of the first lens. is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 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.

17. An electronic device, characterized in that: The optical lens according to any one of claims 1 to 16, 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