Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device. The optical lens comprises, in sequence from a first side to a second side along an optical axis, a first lens with negative optical power, a first side surface of the first lens being a convex surface and a second side surface of the first lens being a concave surface; a second lens with negative optical power; a third lens with positive optical power, both the first side surface and the second side surface of the third lens being convex surfaces; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with positive optical power; a seventh lens with positive optical power; the number of lenses with optical power in the optical lens is seven; the optical lens further comprises a diaphragm arranged between the third lens and the fourth lens; the optical lens satisfies: -0.9<=F1 / F3<=-0.5 and 1.7<=F3 / F<=2.8; wherein, F1 is the focal length of the first lens; F3 is the focal length of the third lens; and F is the total effective focal length of the optical lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular to an optical lens and an electronic device. BACKGROUND

[0002] In recent years, with the continuous progress of science and technology and the continuous development of society, the market has increasingly high requirements for optical lenses applied to various scenes; especially with the development of intelligent driving technology, vehicle-mounted lenses such as laser radar lenses, as key components for obtaining external information, have increasingly high demands.

[0003] However, in order to meet safety requirements and obtain a larger detection range, most laser radar lenses on the market currently choose to increase the field of view angle, which also makes the volume of these lenses large (the total optical length is large) and the aperture small (the light throughput is low), which is not conducive to adapting to the needs of various terminal devices. SUMMARY

[0004] Although the existing laser radar lens has a large field of view angle, it has the problems of large volume and small aperture, and the present application provides an optical lens and an electronic device, which can increase the light intake while realizing a small volume, meet the needs of various terminal devices, such as cameras, projection lamps, or laser radars, etc.

[0005] The first aspect of the present application provides such an optical lens, which comprises, in order along the optical axis from the first side to the second side: a first lens with negative optical power, the first side of the first lens being a convex surface, and the second side of the first lens being a concave surface; a second lens with negative optical power; a third lens with positive optical power, the first side and the second side of the third lens being convex surfaces; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with positive optical power; a seventh lens with positive optical power; the number of lenses with optical power in the optical lens is seven; the optical lens further comprises a diaphragm arranged between the third lens and the fourth lens; the optical lens satisfies -0.9≤F1 / F3≤-0.5 and 1.7≤F3 / F≤2.8; wherein F1 is the focal length of the first lens; F3 is the focal length of the third lens; F is the total effective focal length of the optical lens.

[0006] In this way, the optical lens adopts seven lenses with optical power, and satisfies the relationship -0.9≤F1 / F3≤-0.5 and 1.7≤F3 / F≤2.8. On one hand, the first lens is a negative lens with a convex shape towards the object side and has a diverging effect on light rays, which is conducive to collecting light rays of a large field of view, increasing light flux, and diffusing the light rays collected by the first lens to the image side of the first lens to achieve a large field of view angle imaging. Meanwhile, the third lens is a positive lens with a biconvex shape and has a significant converging effect on light rays, which can appropriately flatten the light rays from the second lens, reduce the degree of divergence, and enable the light rays to smoothly transition to the rear lens. On the other hand, by limiting the relationship between the focal length of the first lens and the focal length of the third lens, the light rays emitted from the third lens to the stop are in a certain diverging state, which can increase the entrance pupil diameter of the optical lens, thereby reducing the aperture number under the condition of a certain focal length, and further increasing the light intake of the optical lens. Moreover, by limiting the relationship between the focal length of the third lens and the total effective focal length of the optical lens, the optical path required for the light rays emitted from the third lens to converge to the stop is relatively short, thereby reducing the total optical length of the optical lens, which is conducive to adapting to the needs of various terminal devices, such as cameras, projection lamps, or laser radars, etc.

[0007] It is worth noting that the focal length F1 of the first lens is negative, and the focal length F3 of the third lens is positive: if F1 / F3<-0.9, the diverging state of the light rays emitted from the third lens to the stop is relatively weak, which is not conducive to increasing the entrance pupil diameter of the optical lens; and if F1 / F3>-0.5, the diverging state of the light rays emitted from the third lens to the stop is too strong, so that the light rays emitted from the third lens cannot be incident to the fourth lens relatively smoothly, resulting in excessive aberration and affecting the imaging quality. In addition, the focal length F3 of the third lens and the total effective focal length F of the optical lens are both positive: if F3 / F<1.7, the focal length F3 of the third lens is too small, and the converging effect on the light rays is too strong, which will reduce the entrance pupil diameter of the optical lens, thereby reducing the light flux of the optical lens; and if F3 / F>2.8, although the light rays can be quickly converged to the stop, the light rays emitted from the third lens are relatively divergent, which is easy to cause a large amount of aberration and increase the difficulty of subsequent aberration correction.

[0008] According to an example embodiment of the present application, the curvature radius R9 of the first side surface of the fifth lens and the curvature radius R10 of the second side surface of the fifth lens satisfy: 1≤R9 / R10≤4.2.

[0009] According to an example embodiment of the present application, the curvature radius R1 of the first side surface of the first lens and the curvature radius R3 of the first side surface of the second lens satisfy: 0.5≤R1 / R3≤3.

[0010] According to an example embodiment of the present application, the optical lens further comprises a stop disposed between the third lens and the fourth lens; the optical lens satisfies at least one of the following relationships: 0.24≤L_stop / TTL≤0.41 and -0.3≤F3 / F4≤-0.17; wherein L_stop is a distance on the optical axis between the stop and a first side surface of the first lens; TTL is a total track length of the optical lens; F3 is a focal length of the third lens; and F4 is a focal length of the fourth lens.

[0011] According to an example embodiment of the present application, a focal length F1 of the first lens and a total effective focal length F of the optical lens satisfy: -1.9≤F1 / F≤-1.2.

[0012] According to an example embodiment of the present application, a focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -9≤F2 / F≤-5.

[0013] According to an example embodiment of the present application, a focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: 2.3≤F6 / F≤12.

[0014] According to an example embodiment of the present application, a focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 2.7≤F7 / F≤15.

[0015] According to an example embodiment of the present application, the optical lens satisfies at least one of the following relationships: 0.7≤(F×θ) / D≤1.1, 0.1≤BFL / TTL≤0.3 and 0.14≤T_DIR / TTL≤0.3; wherein F is a total effective focal length of the optical lens; θ is a radian value of a maximum field of view angle of the optical lens; D is a maximum light passing aperture of a first side surface of the first lens corresponding to the maximum field of view angle of the optical lens; BFL is an optical back focus of the optical lens; TTL is a total track length of the optical lens; and T_DIR is a total air gap of all adjacent lenses in the optical lens on the optical axis.

[0016] According to an example embodiment of the present application, a focal length F1 of the first lens and a focal length F2 of the second lens satisfy: -0.26 / mm≤1 / F1+1 / F2≤-0.17 / mm.

[0017] According to an example embodiment of the present application, the optical lens satisfies at least one of the following relationships: 2.5≤F5 / F≤6, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm and -2.1≤F4 / TTL≤-1.2; or, the optical lens satisfies at least one of the following relationships: F5 / F≤-25, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm and -2.1≤F4 / TTL≤-1.2; wherein F5 is the focal length of the fifth lens; F is the total effective focal length of the optical lens; F6 is the focal length of the sixth lens; F7 is the focal length of the seventh lens; F4 is the focal length of the fourth lens; and TTL is the total track length of the optical lens.

[0018] According to an example embodiment of the present application, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy: 0.47≤CT6 / CT7≤1.85.

[0019] According to an example embodiment of the present application, the total track length TTL of the optical lens and the clear aperture D on the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: 1.4≤TTL / D≤2.2.

[0020] According to an example embodiment of the present application, the first side surface of the second lens is convex, and the second side surface of the second lens is concave; the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is concave.

[0021] According to an example embodiment of the present application, the fifth lens has positive refractive power, the first side surface of the fifth lens is concave, the second side surface of the fifth lens is convex, and the focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: 2.5≤F5 / F≤6; or, the fifth lens has negative refractive power, the first side surface of the fifth lens is concave, the second side surface of the fifth lens is concave, and the focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: F5 / F≤-25.

[0022] According to an example embodiment of the present application, the first side surface and the second side surface of the sixth lens are both convex; or, the first side surface of the sixth lens is convex, and the second side surface of the sixth lens is concave; or, the first side surface of the sixth lens is concave, and the second side surface of the sixth lens is convex.

[0023] According to an example embodiment of the present application, the first side surface and the second side surface of the seventh lens are both convex; or, the first side surface of the seventh lens is convex, and the second side surface of the seventh lens is concave; or, the first side surface of the seventh lens is concave, and the second side surface of the seventh lens is convex.

[0024] According to one exemplary embodiment of the present application, the optical lens satisfies at least one of the following relationships: -0.81≤F1 / F3≤-0.58, 1.9≤F3 / F≤2.5, 1≤R9 / R10≤3.7, 0.55≤R1 / R3≤2.7, 0.29≤L_stop / TTL≤0.36, -0.27≤F3 / F4≤-0.17, -1.7≤F1 / F≤-1.4, -7.5≤F2 / F≤-6, 2.5≤F6 / F≤11, 3≤F7 / F≤13, 0.8≤(F x θ) / D≤0.95, 0.11≤BFL / TTL≤0.28, 0.16≤T_DIR / TTL≤0.27, -0.23 / mm≤1 / F1+1 / F2≤-0.2 / mm, 3.0≤F5 / F≤5, 0.1 / mm≤1 / F6+1 / F7≤0.19 / mm, -1.9≤F4 / TTL≤-1.4, 0.5≤CT6 / CT7≤1.7, and 1.6≤TTL / D≤1.9; or, the optical lens satisfies at least one of the following relationships: -0.81≤F1 / F3≤-0.58, 1.9≤F3 / F≤2.5, 1≤R9 / R10≤3.7, 0.55≤R1 / R3≤2.7, 0.29≤L_stop / TTL≤0.36, -0.27≤F3 / F4≤-0.17, -1.7≤F1 / F≤-1.4, -7.5≤F2 / F≤-6, 2.5≤F6 / F≤11, 3≤F7 / F≤13, 0.8≤(F x θ) / D≤0.95, 0.11≤BFL / TTL≤0.28, 0.16≤T_DIR / TTL≤0.27, -0.23 / mm≤1 / F1+1 / F2≤-0.2 / mm, -100≤F5 / F≤-25, 0.1 / mm≤1 / F6+1 / F7≤0.19 / mm, -1.9≤F4 / TTL≤-1.4, 0.5≤CT6 / CT7≤1.7, and 1.6≤TTL / D≤1.9.9; wherein, F1 is a focal length of the first lens; F3 is a focal length of the third lens; F is a total effective focal length of the optical lens; R9 is a radius of curvature of a first side of the fifth lens; R10 is a radius of curvature of a second side of the fifth lens; R1 is a radius of curvature of a first side of the first lens; R3 is a radius of curvature of a first side of the second lens; L_stop is a distance between the stop and the first side of the first lens on the optical axis; TTL is a total track length of the optical lens; F4 is a focal length of the fourth lens; F2 is a focal length of the second lens; F6 is a focal length of the sixth lens; F7 is a focal length of the seventh lens; theta is a radian value of a maximum field angle of the optical lens; D is a clear aperture on the first side of the first lens corresponding to the maximum field angle of the optical lens; BFL is a back focal length of the optical lens; T_DIR is a total air gap of all adjacent lenses in the optical lens on the optical axis; F5 is a focal length of the fifth lens; CT6 is a center thickness of the sixth lens on the optical axis; and CT7 is a center thickness of the seventh lens on the optical axis.

[0025] A second aspect of the present application provides an electronic device including any of the optical lenses described above, and at least one of an imaging element and a light source.

[0026] The imaging element is configured to convert an optical image or optical information formed by the optical lens into an electrical signal.

[0027] The light source is located on the second side of the optical lens, and light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side of the optical lens.

[0028] According to an example embodiment of the present application, the electronic device is a laser radar, a camera, or a projection lamp.

[0029] According to an example embodiment of the present application, the receiving end lens of the laser radar is the optical lens, the first side of the optical lens is an object side, and the second side of the optical lens is an image side.

[0030] A third aspect of the present application provides a vehicle including any of the electronic devices described above.

[0031] The fourth aspect of the present application provides an optical lens comprising, in order from a first side to a second side along an optical axis: a first lens having negative optical power, the first side of the first lens being convex, and the second side of the first lens being concave; a second lens having negative optical power, the first side of the second lens being convex, and the second side of the second lens being concave; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; the number of lenses having optical power in the optical lens is seven; the optical lens satisfies -1.9≤F1 / F≤-1.2 and -9≤F2 / F≤-5; wherein F1 is the focal length of the first lens; F is the total effective focal length of the optical lens; and F2 is the focal length of the second lens.

[0032] In this way, the optical lens of the present application adopts seven lenses having optical power and satisfies the relationship -1.9≤F1 / F≤-1.2 and -9≤F2 / F≤-5; on the one hand, the first lens is a negative lens with a convex shape towards the object side and has a diverging effect on light rays, which is conducive to collecting light rays in a large field of view, increasing light flux, and diffusing the light rays collected by the first lens to the image side of the first lens to achieve large field angle imaging; at the same time, the second lens is a negative lens with a shape like a crescent moon and concave towards the image side, which is conducive to further diffusing light rays in front and reducing the angle of light rays so that the light rays can transition smoothly; on the other hand, not only is the focal length of the first lens and the total effective focal length of the optical lens controlled within a reasonable range, but also the focal length of the second lens and the total effective focal length of the optical lens are controlled within a reasonable range, so that the light beam can transition smoothly while achieving large field of view collection through the first lens with negative optical power, which is conducive to reducing aberration and improving image quality.

[0033] It is worth noting that the focal length F1 of the first lens is negative, and this relationship F1 / F plays a key role in the angle of incidence and the initial convergence or divergence of light rays in the lens: if F1 / F<-1.9, the light divergence ability will be insufficient, which will affect the light throughput and imaging quality of the lens; if F1 / F>-1.2, the divergence of light rays from the object side space will be too strong, which will easily introduce a large amount of aberration. In addition, the focal length F2 of the second lens is negative: if F2 / F<-9, the divergence of the second lens to the light rays from the first lens will be weak, which is not conducive to aberration correction; if F2 / F>-5, it is not conducive to the smooth transition of light rays received by the first lens, which is easy to introduce more aberration.

[0034] The fifth aspect of the present application provides an optical lens comprising, in order from a first side to a second side along an optical axis: a first lens having negative refractive power, the first side of the first lens being convex, and the second side of the first lens being concave; a second lens having negative refractive power; a third lens having positive refractive power, the first side and the second side of the third lens being convex; a fourth lens having negative refractive power, the first side of the fourth lens being convex, and the second side of the fourth lens being concave; a fifth lens having refractive power; a sixth lens having positive refractive power; and a seventh lens having positive refractive power, wherein the number of lenses having refractive power in the optical lens is seven, and the optical lens satisfies -0.9≤F1 / F3≤-0.5 and -0.3≤F3 / F4≤-0.17, wherein F1 is the focal length of the first lens, F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens.

[0035] In this way, the optical lens of the present application adopts seven lenses having refractive power and satisfies the relationship -0.9≤F1 / F3≤-0.5 and -0.3≤F3 / F4≤-0.17. On the one hand, the first lens is a negative lens with a convex shape towards the object side and has a diverging effect on light rays, which is conducive to collecting light rays in a large field of view, increasing the light flux, and diffusing the light rays collected by the first lens to the image side of the first lens to achieve a large field of view angle. The third lens is a positive lens with a biconvex shape and has a significant converging effect on light rays, which can appropriately flatten the light rays from the second lens, reduce the degree of divergence, and enable the light rays to smoothly transition to the rear lenses. The fourth lens is a negative lens with a meniscus shape and convex towards the object side, which can effectively diffuse the light rays entering the fourth lens after exiting the third lens, so that the exiting light rays have a larger angle with the optical axis, thereby achieving a smaller total optical length at the same image height. In addition, the large angle between the exiting light rays of the fourth lens and the optical axis also enables the incident area of the rear lenses to be larger, which is conducive to the correction of aberrations by the rear lenses. On the other hand, not only does the relationship between the focal length of the first lens and the focal length of the third lens enable the light rays exiting the third lens to be in a certain state of divergence, which can increase the entrance pupil diameter of the optical lens, thereby reducing the aperture number under the condition of a certain focal length and increasing the light intake of the optical lens, but also the relationship between the focal length of the third lens and the focal length of the fourth lens enables the light rays to transition smoothly and improves the resolving power of the optical lens.

[0036] It is worth noting that the focal length F1 of the first lens is negative and the focal length F3 of the third lens is positive: if F1 / F3<-0.9, the divergence state of the light rays exiting the third lens to the diaphragm is relatively weak, which is not conducive to increasing the entrance pupil diameter of the optical lens; and if F1 / F3>-0.5, the divergence state of the light rays exiting the third lens to the diaphragm is too strong, so that the light rays exiting the third lens cannot be incident to the fourth lens relatively gently, resulting in too large aberration and affecting the imaging quality. In addition, the relationship F3 / F4 has a significant impact on the light deflection ability of the intermediate transition group of the optical lens: if F3 / F4<-0.3, the convergence ability of the third lens becomes weak and the divergence ability of the fourth lens becomes strong, so that the divergence ability of the light rays is too strong, and then under the condition of ensuring the optical total length, the correction pressure on the subsequent lenses is too large, which is not conducive to improving the resolving power; and if F3 / F4>-0.17, the convergence ability of the third lens becomes strong and the divergence ability of the fourth lens becomes weak, so that the edge ray slope after the third lens drops sharply, and the fourth lens cannot effectively control the light ray trend, resulting in too large incident angle of the rear end light rays, thereby introducing too much aberration, which is also not conducive to improving the resolving power.

[0037] The sixth aspect of the present application provides an optical lens, which comprises, in order from the first side to the second side along the optical axis: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having refractive power; a sixth lens having positive refractive power; and a seventh lens having positive refractive power; wherein the number of lenses having refractive power in the optical lens is seven; the optical lens satisfies 2.3≤F6 / F≤12 and 2.7≤F7 / F≤15; wherein F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, and F is the total effective focal length of the optical lens.

[0038] In this way, the optical lens of the present application adopts seven lenses having refractive power and satisfies the relationship 2.3≤F6 / F≤12 and 2.7≤F7 / F≤15; not only the relationship between the focal length of the sixth lens and the total effective focal length of the optical lens is limited, but also the front end light rays are converged by the sixth lens having positive refractive power, so that the light ray trend is smoothly transitioned, which is conducive to improving the image quality; and the relationship between the focal length of the seventh lens and the total effective focal length of the optical lens is also limited, and the front end light rays are further converged by the seventh lens having positive refractive power, so that the light rays are smoothly converged to the image plane, which is conducive to ensuring that the system obtains the best imaging effect.

[0039] It is worth noting that the sixth lens, as the penultimate lens in the optical lens, is used for the final fine adjustment of the light rays to ensure that the optical system obtains the best imaging effect: if F6 / F < 2.3, the adjustment range of the sixth lens for the light rays will be too large, which is not conducive to the smooth transition of the light rays and the improvement of the image quality; if F6 / F > 12, the adjustment range of the sixth lens for the light rays will be too weak, which cannot reflect the adjustment effect of the sixth lens. In addition, the seventh lens, as the last lens in the optical lens, is used for the final correction of aberration to ensure that the optical system obtains the best imaging effect, and also plays a fine adjustment role for the light rays: if F7 / F < 2.7, the adjustment range of the seventh lens for the light rays will be too large, which is not conducive to the smooth transition of the light rays and the improvement of the image quality; if F7 / F > 15, the adjustment range of the seventh lens for the light rays will be too weak, which cannot reflect the adjustment effect of the seventh lens. BRIEF DESCRIPTION OF DRAWINGS

[0040] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings. In the drawings:

[0041] Figure 1 A structural schematic diagram of an optical lens according to Embodiment 1 of the application is shown;

[0042] Figure 2 A spot diagram of the optical lens according to Embodiment 1 of the application is shown;

[0043] Figure 3 A structural schematic diagram of an optical lens according to Embodiment 2 of the application is shown;

[0044] Figure 4 A spot diagram of the optical lens according to Embodiment 2 of the application is shown;

[0045] Figure 5 A structural schematic diagram of an optical lens according to Embodiment 3 of the application is shown;

[0046] Figure 6 A spot diagram of the optical lens according to Embodiment 3 of the application is shown;

[0047] Figure 7 A structural schematic diagram of an optical lens according to Embodiment 4 of the application is shown;

[0048] Figure 8 A spot diagram of the optical lens according to Embodiment 4 of the application is shown;

[0049] Figure 9 A structural schematic diagram of an optical lens according to Embodiment 5 of the application is shown;

[0050] Figure 10 A point spread function diagram of the optical lens according to Embodiment 5 of the present application is shown;

[0051] Figure 11 A structural schematic diagram of the optical lens according to Embodiment 6 of the present application is shown;

[0052] Figure 12 A point spread function diagram of the optical lens according to Embodiment 6 of the present application is shown;

[0053] Figure 13 A structural schematic diagram of the optical lens according to Embodiment 7 of the present application is shown;

[0054] Figure 14 A point spread function diagram of the optical lens according to Embodiment 7 of the present application is shown;

[0055] Figure 15 A structural schematic diagram of the optical lens according to Embodiment 8 of the present application is shown;

[0056] Figure 16 A point spread function diagram of the optical lens according to Embodiment 8 of the present application is shown;

[0057] Figure 17 A structural schematic diagram of the optical lens according to Embodiment 9 of the present application is shown;

[0058] Figure 18 A point spread function diagram of the optical lens according to Embodiment 9 of the present application is shown;

[0059] Figure 19 A structural schematic diagram of the optical lens according to Embodiment 10 of the present application is shown;

[0060] Figure 20 A point spread function diagram of the optical lens according to Embodiment 10 of the present application is shown;

[0061] Figure 21 A structural schematic diagram of the optical lens according to Embodiment 11 of the present application is shown;

[0062] Figure 22 A point spread function diagram of the optical lens according to Embodiment 11 of the present application is shown;

[0063] Figure 23 A structural schematic diagram of the optical lens according to Embodiment 12 of the present application is shown;

[0064] Figure 24 A point spread function diagram of the optical lens according to Embodiment 12 of the present application is shown;

[0065] Figure 25 A structural schematic diagram of the optical lens according to Embodiment 13 of the present application is shown;

[0066] Figure 26 A point spread function diagram of the optical lens according to Embodiment 13 of the present application is shown;

[0067] Figure 27 A structural schematic diagram of the optical lens according to Embodiment 14 of the present application is shown;

[0068] Figure 28 A point spread function diagram of the optical lens according to Embodiment 14 of the present application is shown;

[0069] Figure 29 A structural schematic diagram of the optical lens according to Embodiment 15 of the present application is shown;

[0070] Figure 30 A point spread function diagram of the optical lens according to Embodiment 15 of the present application is shown;

[0071] Figure 31 A structural schematic diagram of the optical lens according to Comparative Example 1 of the present application is shown;

[0072] Figure 32 A point spread function diagram of the optical lens according to Comparative Example 1 of the present application is shown;

[0073] Figure 33 A structural schematic diagram of the optical lens according to Comparative Example 2 of the present application is shown;

[0074] Figure 34 A point spread function diagram of the optical lens according to Comparative Example 2 of the present application is shown;

[0075] Figure 35 A structural schematic diagram of the optical lens according to Comparative Example 3 of the present application is shown. DETAILED DESCRIPTION

[0076] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive in nature and is in no way intended to limit the scope of the present application. Throughout the description, like reference numerals refer to like elements.

[0077] It should be noted that in the present specification, the terms first, second, third, etc. are merely used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0078] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0079] In this document, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, 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 referred to as the first side surface of the lens, and the surface of each lens closest to the second side is referred to as the second side surface of the lens.

[0080] It should also be understood that the use of the term "including", "including" and / or "having" when used in this specification intends to mean that there are additions to 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 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.

[0081] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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 the terms (for example, terms defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0082] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. The features, principles and other aspects of the present application are described in detail below.

[0083] The optical lens according to the exemplary embodiments of the present application can include, for example, seven lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in order from a first side to a second side along an optical axis.

[0084] In example embodiments, the optical lens provided in the present application can be used as a light receiving lens or a light emitting lens. The light receiving lens is generally used to collect light from an object space, and the collected light is used to form detection information, including but not limited to imaging, laser point cloud, etc. The light emitting lens is generally used to transmit light from a light emitting unit to the object space. According to the effect of the light, the light transmitted to the object space can be divided into projection light used to form a projection image or detection light used to detect target object information, etc.

[0085] It is worth noting that, in the case where the optical lens provided in the present application is used as a light receiving lens such as a camera lens, a laser radar receiving end lens, a microscope lens or a telescope lens, the "first side" referred to herein can refer to an object side, and the "second side" can refer to an image side (e.g., a side where a photosensor or a retina is located), that is, light from the object side can be imaged on the image side via the optical lens. 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. In the case where the optical lens provided in the present application is used as a light emitting lens such as a projection lens or a laser radar transmitting end lens, the "first side" referred to herein can refer to an object side, and the "second side" can refer to a light source side, that is, light from the light source side can be projected on the object side via the optical lens.

[0086] In some possible embodiments, the optical lens provided in the present application can also simultaneously assume light receiving and light emitting functions. For example, the optical lens provided in the present application is used in a laser radar system sharing a light path, and the optical lens simultaneously assumes the functions of emitting laser and receiving a radar return light beam. For another example, the optical lens provided in the present application is used in a system integrating optical communication and radar, and the optical lens simultaneously assumes the functions of emitting a modulated light signal and receiving a radar return light beam.

[0087] In addition, the laser radar mentioned in the present application can be implemented as a mechanical laser radar, a semi-solid laser radar or a pure solid laser radar.

[0088] In example embodiments, the first lens can have a negative optical power, the first side thereof can be implemented as a convex surface, and the second side thereof can be implemented as a concave surface. In the above embodiment, the first lens is a negative lens, has a diverging effect on light, and is convex to the object side, which is beneficial to collect light of a large field of view, increase light flux, and diffuse the light collected by the first lens to the rear (image side) of the first lens, thereby realizing imaging of a large field of view. Meanwhile, the first side of the first lens is provided as a convex surface, which is beneficial to the sliding of water droplets in actual application, and reduces the influence of external environment such as water droplets on imaging quality. The material of the first lens is not limited in the present application, for example, the first lens can use glass, plastic or the like.

[0089] In an example embodiment, the second lens can have a negative focal power, the first side surface thereof can be implemented as a convex surface, and the second side surface thereof can be implemented as a concave surface. In the above embodiment, the second lens is a negative lens, has a meniscus shape and is concave toward the image side, and is beneficial to further diffuse the front light rays and reduce the light ray angles, so that the light rays can be smoothly transitioned.

[0090] In an example embodiment, the third lens can have a positive focal power, the first side surface thereof can be implemented as a convex surface, and the second side surface thereof can be implemented as a convex surface. In the above embodiment, the third lens is a positive lens, has a biconvex shape and has a significant converging effect on the light rays, can appropriately smooth the light rays from the second lens and reduce the degree of divergence, so that the light rays can be smoothly transitioned to the rear lens.

[0091] In an example embodiment, the fourth lens can have a negative focal power, the first side surface thereof can be implemented as a convex surface, and the second side surface thereof can be implemented as a concave surface. In the above embodiment, the fourth lens is a negative lens, has a meniscus shape and is convex toward the object side, can have a good diffusing effect on the light rays entering the fourth lens after being emitted by the third lens, so that the emitted light rays have a larger included angle with the main optical axis, thereby achieving a smaller total optical length at the same image height. In addition, the larger included angle between the emitted light rays of the fourth lens and the main optical axis can also make the incident area of the rear lens larger, which is beneficial to the correction of aberration by the rear lens.

[0092] It is worth noting that if the first side surface of the fourth lens is implemented as a concave surface and the second side surface thereof is implemented as a convex surface, i.e., the fourth lens has a meniscus shape and is convex toward the image side, a larger total optical length is achieved at the same image height, resulting in a larger volume of the optical lens, which is not conducive to the miniaturization design of the terminal device, such as the miniaturization requirement of various vehicle-mounted terminals. For example, the fourth lens in each of Embodiments 1 to 15 is a convex-concave lens, and accordingly, the maximum total optical length of the optical lens is only 22.4 mm; while in Comparative Example 1, the fourth lens is a concave-convex lens, and accordingly, the total optical length of the optical lens reaches 30.7964 mm.

[0093] In a possible implementation, the fifth lens has a focal power. For example, the fifth lens has a positive focal power, or the fifth lens has a negative focal power.

[0094] In the case where the fifth lens has a positive focal power, the first side surface of the fifth lens can be implemented as a concave surface, and the second side surface thereof can be implemented as a convex surface. In the above embodiment, the fifth lens is a positive lens, has a meniscus shape and is concave toward the object side, can reduce the incident angle of the light rays entering the fifth lens, is beneficial to balance the convergence difference between the edge light rays and the near-axis light rays, and reduces the astigmatism at a large field angle. It is worth noting that the asymmetric folding of the off-axis light rays can cause a comet-shaped light spot; and the smooth path design can ensure the symmetric convergence of the light rays and reduce such asymmetry.

[0095] In the case that the fifth lens has negative refractive power, the first side surface of the fifth lens can be implemented as a convex surface, and the second side surface can be implemented as a concave surface. In the above implementation, the fifth lens is a negative lens, which is shaped as a meniscus convex to the object side. The larger focal length can also reduce the incident angle of the light rays entering the fifth lens, which is conducive to balancing the convergence difference between the marginal rays and the paraxial rays, and reducing the coma of the large field angle.

[0096] In the example implementation, the sixth lens can have positive refractive power, and the surface shape of the sixth lens can be implemented as a convex-concave shape, a concave-convex shape, or a convex-convex shape.

[0097] In the case that the sixth lens has positive refractive power, the first side surface of the sixth lens is implemented as a convex surface, and the second side surface is implemented as a convex surface. The sixth lens is a positive lens, which is shaped as a biconvex shape, which is conducive to converging the light rays, so that the light rays transition smoothly. At the same time, the light rays can reach the image plane more quickly, reducing the total length of the lens. In addition, the marginal field of view light rays will be deflected towards the optical axis after passing through the sixth lens, which is conducive to reducing the aperture of the rear end of the lens and performing preliminary aberration correction on the incident light rays.

[0098] In the case that the sixth lens has positive refractive power, the first side surface of the sixth lens is implemented as a convex surface, and the second side surface is implemented as a concave surface. The sixth lens is a positive lens, and the first side surface is set as a convex surface, so that the light rays can be appropriately converged, which is conducive to receiving the light rays emitted by the fifth lens, further reducing the height of the light rays in the lens, and facilitating the reduction of the aperture of the rear end. At the same time, the second side surface of the sixth lens is set as a concave surface, and the surface shape is relatively flat, which is conducive to the smooth transition of the light rays, so as to preliminarily correct the aberration of the light rays incident to the sixth lens.

[0099] In the case that the sixth lens has positive refractive power, the first side surface of the sixth lens is implemented as a concave surface, and the second side surface is implemented as a convex surface. The sixth lens is a positive lens, and the first side surface is set as a concave surface, which is conducive to the smooth transition of the light rays, reducing the aberration of the emitted light rays. At the same time, the second side surface of the sixth lens is set as a convex surface, so that the light rays can be appropriately converged, which is conducive to reducing the height of the emitted light rays, and facilitating the reduction of the aperture of the rear end.

[0100] In the example implementation, the seventh lens can have positive refractive power, and the surface shape of the sixth lens can be implemented as a convex-concave shape, a concave-convex shape, or a convex-convex shape.

[0101] In the case that the seventh lens has positive refractive power, the first side surface of the seventh lens is implemented as a convex surface, and the second side surface is implemented as a convex surface. The seventh lens is a positive lens, which is shaped as a biconvex shape, which is conducive to converging the light rays, so that the light rays transition smoothly and converge to the image plane. At the same time, the seventh lens can cooperate with the sixth lens to correct the aberration together, improving the image quality.

[0102] In the case that the seventh lens has positive refractive power, the first side surface thereof is implemented as a convex surface, and the second side surface thereof is implemented as a concave surface, the seventh lens is a positive lens, the first side surface thereof is provided as a convex surface, so that the light rays are properly converged, which is beneficial to receiving the light rays emitted via the sixth lens, further reduces the height of the light rays in the lens, and facilitates the reduction of the aperture; meanwhile, the second side surface of the seventh lens is provided as a concave surface, and the surface profile is relatively flat, which is beneficial to the flat emission of the light rays and the improvement of the image quality.

[0103] In the case that the seventh lens has positive refractive power, the first side surface thereof is implemented as a concave surface, and the second side surface thereof is implemented as a convex surface, the seventh lens is a positive lens, the first side surface thereof is provided as a concave surface, and the surface profile is relatively flat, which is beneficial to the flat transition of the light rays; meanwhile, the second side surface of the seventh lens is provided as a convex surface, which can converge the front light rays, so that the light rays are stably converged to the image plane.

[0104] In the example embodiment, the optical lens can further include a diaphragm, which can be arranged between the third lens and the fourth lens. By arranging the diaphragm between the third lens and the fourth lens, the light rays entering the optical system can be effectively collected, the lens aperture at the front end of the optical system can be reduced, and the assembly sensitivity of the system can be reduced.

[0105] In the example embodiment, one or more spherical surfaces can be included in the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens. In addition, in other embodiments of the present application, one or more aspheric surfaces can be included in the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, so that the deflection of the light rays in each field of view can be reasonably controlled, various aberrations such as spherical aberration, coma, distortion and the like can be effectively reduced, and the performance of the optical lens can be improved.

[0106] In the example embodiment, the optical lens can further include a filter located between the seventh lens and the image plane, so as to filter the light rays with different wavelengths. The optical lens can further arrange a protective glass between the filter and the image plane according to actual needs, so as to prevent the internal elements (for example, a chip) of the optical lens from being damaged.

[0107] In the example embodiment, the optical lens can further include a photoelectric sensor arranged on the second side. Optionally, the photoelectric sensor arranged on the second side can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0108] In an exemplary embodiment, the focal length F1 of the first lens and the focal length F3 of the third lens can satisfy the following relationship: -0.9 ≤ F1 / F3 ≤ -0.5. Preferably, -0.81 ≤ F1 / F3 ≤ -0.58. By controlling this relationship, the light emitted from the third lens to the aperture stop maintains a certain divergence, increasing the entrance pupil diameter of the optical lens. This allows the aperture number to be reduced while maintaining a constant focal length, thereby increasing the amount of light entering the optical lens.

[0109] It is worth noting that the focal length F1 of the first lens is negative, and the focal length F3 of the third lens is positive: if F1 / F3 is less than -0.9, the divergence of the light emitted from the third lens to the aperture is relatively weak, which is not conducive to increasing the entrance pupil diameter of the optical lens; while if F1 / F3 is greater than -0.5, the divergence of the light emitted from the third lens to the aperture is too strong, preventing the light emitted from the third lens from being incident on the fourth lens relatively smoothly, resulting in excessive aberrations and affecting image quality. For example, in Comparative Example 2, the F1 / F3 of the optical lens is equal to -0.417, that is, greater than -0.5. Simulation results show that its RMS (Root Mean Square) radius is large, aberrations are large, and image quality is poor. In Comparative Example 3, the F1 / F3 of the optical lens is equal to -1.097, that is, less than -0.9. Simulation results show that its entrance pupil diameter is small, and the amount of light entering the optical lens is poor.

[0110] In an exemplary embodiment, the focal length F3 of the third lens and the total effective focal length F of the optical lens can satisfy the following relationship: 1.7 ≤ F3 / F ≤ 2.8. Preferably, 1.9 ≤ F3 / F ≤ 2.5. By controlling this relationship, the optical path required for light emitted from the third lens to converge to the aperture is shortened, thereby reducing the overall optical length of the optical lens and facilitating adaptation to the needs of various terminal devices, such as cameras, projectors, or lidar.

[0111] It is worth noting that the focal length F3 of the third lens and the total effective focal length F of the optical lens are both positive: if F3 / F < 1.7, the focal length F3 of the third lens is too small, and the convergence effect on light is too strong, which will reduce the entrance pupil diameter of the optical lens and thus reduce the luminous flux of the optical lens; and if F3 / F > 2.8, although the light can be quickly converged to the aperture, the light emitted from the third lens is more divergent, which is likely to cause a large amount of aberrations, making subsequent aberration correction more difficult.

[0112] In addition, the combination of the above-mentioned relationship -0.9≤F1 / F3≤-0.5 and the relationship 1.7≤F3 / F≤2.8 not only makes the light rays exiting from the third lens to the stop in a certain divergent state by limiting the relationship between the focal length of the first lens and the focal length of the third lens, so as to increase the entrance pupil diameter of the optical lens, thereby reducing the F-number under the condition of a certain focal length, and further increasing the light intake of the optical lens, but also makes the light rays exiting from the third lens converge to the stop in a shorter optical path, thereby reducing the total optical length of the optical lens. In other words, the combination of the relationship F3 / F and the relationship F1 / F3 can realize large light intake, high resolution and miniaturization of the optical lens.

[0113] In the example embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the radius of curvature R10 of the second side surface of the fifth lens satisfy: 1≤R9 / R10≤4.2. Preferably, 1≤R9 / R10≤3.7. By controlling the relationship, the convergence difference between the marginal rays and the paraxial rays can be balanced, and the coma of the large field angle can be reduced. It can be understood that the radius of curvature of the first side surface and the second side surface of the fifth lens are both greater than 0: if R9 / R10<1, R9 and R10 are too close, and in combination with the large divergence angle of the light rays exiting from the fourth lens, the marginal rays are easily refracted at a large angle at the fifth lens, which is not conducive to balancing the convergence difference between the marginal rays and the paraxial rays, and coma of the large field angle is prone to occur; and if R9 / R10>4.2, the marginal rays are also easily refracted at a large angle at the exit surface of the fifth lens under the premise of ensuring that the light rays exiting from the fourth lens enter the fifth lens at a small angle, which is also not conducive to balancing the convergence difference between the marginal rays and the paraxial rays, and coma of the large field angle is prone to occur.

[0114] In the example embodiment, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R3 of the first side surface of the second lens satisfy: 0.5≤R1 / R3≤3. Preferably, 0.55≤R1 / R3≤2.7. It can be understood that although the first side surface with a positive radius of curvature in the first lens is conducive to collecting large-angle incident light rays, which is beneficial to improve the light flux; however, if the incident angle of the light rays entering the lens is large, the focusing positions of the marginal rays and the paraxial rays will have large spherical aberration. However, the above-mentioned relationship R1 / R3 makes the radius of curvature R3 of the first side surface of the second lens less than twice the radius of curvature R1 of the first side surface of the first lens, so that the incident angle of the light rays from the first lens when entering the second lens is small, thereby avoiding the generation of large aberrations such as spherical aberration and coma, which is conducive to further improving the light flux and resolution performance of the optical lens.

[0115] In the exemplary embodiment, the distance L_stop between the stop and the first side surface of the first lens on the optical axis can satisfy 0.24≤L_stop / TTL≤0.41, where TTL is the total track length of the optical lens. Preferably, 0.29≤L_stop / TTL≤0.36. It can be understood that if L_stop / TTL is too large, the aperture of the first lens will be too large, which is not conducive to the miniaturization of the optical lens.

[0116] It is worth noting that the present application combines the relationship 0.24≤L_stop / TTL≤0.41 with the above relationship -0.9≤F1 / F3≤-0.5, not only by limiting the relationship between the focal length of the first lens and the focal length of the third lens, so that the light rays exiting from the third lens to the stop are in a certain divergent state, the entrance pupil diameter of the optical lens can be increased, thereby reducing the aperture number under the condition of a certain focal length, and further increasing the light quantity of the optical lens; but also by limiting the relationship between the distance between the stop and the first side surface of the first lens on the optical axis and the total track length, avoiding the aperture of the first lens being too large, which is conducive to the miniaturization of the optical lens, thereby realizing the large light quantity, high resolution and miniaturization of the optical lens.

[0117] In the exemplary embodiment, the focal length F3 of the third lens and the focal length F4 of the fourth lens can satisfy -0.3≤F3 / F4≤-0.17. Preferably, -0.27≤F3 / F4≤-0.17. By controlling the relationship, the light rays are smoothly transitioned, and the resolving power of the optical lens is improved. It can be understood that the relationship F3 / F4 has a significant impact on the light deflection ability of the middle transition group of the optical lens: if F3 / F4<-0.3, the convergence ability of the third lens will be weakened, and the divergence ability of the fourth lens will be strengthened, so that the divergence ability of the light rays is too strong, and the correction pressure on the subsequent lenses is too large under the condition of ensuring the total track length, which is not conducive to improving the resolving power; and if F3 / F4>-0.17, the convergence ability of the third lens will be strengthened, and the divergence ability of the fourth lens will be weakened, so that the edge ray slope after the third lens drops sharply, and the fourth lens cannot effectively control the light ray trend, resulting in a large incident angle of the rear light rays, thereby introducing too much aberration, which is also not conducive to improving the resolving power.

[0118] It is worth noting that the present application combines the relationship -0.3≤F3 / F4≤-0.17 with the above relationship 1.7≤F3 / F≤2.8, not only by limiting the relationship between the focal length of the third lens and the focal length of the fourth lens, so that the light rays are smoothly transitioned, and the resolving power of the optical lens is improved; but also by limiting the relationship between the focal length of the third lens and the total effective focal length of the optical lens, so that the optical path required for the light rays exiting from the third lens to converge to the stop is relatively short, thereby reducing the total track length of the optical lens, and further realizing the miniaturization and high resolution of the optical lens.

[0119] In addition, the present application can also combine the relationship -0.3≤F3 / F4≤-0.17 with the above relationship -0.9≤F1 / F3≤-0.5, not only by limiting the relationship between the focal length of the third lens and the focal length of the fourth lens to make the light transition smoothly, but also by limiting the relationship between the focal length of the first lens and the focal length of the third lens to make the light emitted from the third lens to the stop be in a certain divergent state, so as to increase the entrance pupil diameter of the optical lens, thereby reducing the aperture number under the condition of a certain focal length, and further increasing the light quantity of the optical lens, so as to ensure that the overall light trend is smooth, thereby facilitating the improvement of the resolving power and the increase of the light quantity.

[0120] In the example embodiment, the focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy -1.9≤F1 / F≤-1.2. Preferably, -1.7≤F1 / F≤-1.4. By controlling the relationship F1 / F, the light beam can be smoothly transitioned while realizing large field of view light collection, which is conducive to reducing aberration and improving image quality. It can be understood that the focal length F1 of the first lens is negative, and the relationship F1 / F plays a key role in the light incidence angle and the preliminary convergence or divergence of the lens: if F1 / F<-1.9, the light divergence ability will be insufficient, thereby affecting the light quantity and imaging quality of the lens; if F1 / F>-1.2, the divergence of the light from the object side space will be too strong, which is easy to introduce a large amount of aberration.

[0121] In the example embodiment, the focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy -9≤F2 / F≤-5. Preferably, -7.5≤F2 / F≤-6. By controlling the relationship F2 / F, the smooth transition of the light received by the first lens is facilitated, which is conducive to correcting the aberration introduced by the first lens and improving the image quality. It can be understood that the focal length F2 of the second lens is negative: if F2 / F<-9, the divergence of the light from the first lens by the second lens will be weak, which is not conducive to aberration correction; if F2 / F>-5, the smooth transition of the light received by the first lens will be not conducive, which is easy to introduce more aberration.

[0122] It is worth noting that the present application can combine the relationship -9≤F2 / F≤-5 with the above-mentioned relationship -1.9≤F1 / F≤-1.2, thereby not only controlling the focal length of the first lens and the total effective focal length of the optical lens within a reasonable range, but also achieving a smooth transition of the light beam while achieving a large field of view through the first lens with a negative optical focal length, thereby reducing aberrations and improving image quality; and controlling the focal length of the second lens and the total effective focal length of the optical lens within a reasonable range, thereby helping to receive a smooth transition of light from the first lens through the second lens with a negative optical focal length, correcting the aberrations introduced by the first lens, and facilitating the improvement of image quality, thereby achieving a large field of view and high resolution of the optical lens.

[0123] In addition, the present application can also combine the relationship -9≤F2 / F≤-5 with other relationships -1.9≤F1 / F≤-1.2 and 1.7≤F3 / F≤2.8 to control the focal length of the first lens and the total effective focal length of the optical lens within a reasonable range. The first lens with negative focal power can realize smooth transition of light beams while achieving a large field of view, thereby reducing aberrations and improving image quality. The focal length of the second lens and the total effective focal length of the optical lens can be controlled within a reasonable range. The second lens with negative focal power helps to receive the smooth transition of light from the first lens, correct the aberrations introduced by the first lens, and facilitate improving image quality. By limiting the relationship between the focal length of the third lens and the total effective focal length of the optical lens, the optical path required for the light emitted from the third lens to converge to the aperture is shorter, thereby reducing the total optical length of the optical lens, and then realizing a large field of view, miniaturization and high resolution of the optical lens.

[0124] In an exemplary embodiment, the focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: 2.3≤F6 / F≤12. Preferably, 2.5≤F6 / F≤11. By controlling this relationship, the sixth lens with a positive focal length can converge the front light, so that the light transitions smoothly, which is beneficial to improving image quality. It can be understood that the sixth lens, as the second-to-last lens in the optical lens, is used to make the final fine-tuning of the light so that the light is accurately focused on the detector to ensure that the optical system obtains the best imaging effect: if F6 / F<2.3, the adjustment amplitude of the light by the sixth lens will be too large, which is not conducive to the smooth transition of the light and the improvement of image quality; if F6 / F>12, the adjustment amplitude of the light by the sixth lens will be too weak, and the adjustment effect of the sixth lens cannot be reflected.

[0125] In the example embodiment, the focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 2.7≤F7 / F≤15. Preferably, 3≤F7 / F≤13. By controlling the relationship, the front-end light rays can be further converged by the seventh lens with positive focal length, so that the light rays are smoothly converged to the image plane, which is beneficial to improve the image quality. It can be understood that, as the last lens in the optical lens, the seventh lens is used to bear the final correction of aberration, to ensure that the optical system obtains the best imaging effect, and also fine-tunes the light rays: if F7 / F<2.7, the adjustment range of the light rays by the seventh lens will be too large, which is not conducive to the smooth transition of the light rays and the improvement of the image quality; if F7 / F>15, the adjustment range of the light rays by the seventh lens will be too weak, which cannot reflect the adjustment effect of the seventh lens.

[0126] It is worth noting that, by combining the relationship 2.7≤F7 / F≤15 with the relationship 2.3≤F6 / F≤12 described above, not only the relationship between the focal length of the sixth lens and the total effective focal length of the optical lens is limited, the front-end light rays are converged by the sixth lens with positive focal length, so that the light rays are smoothly transitioned, which is beneficial to improve the image quality; but also the relationship between the focal length of the seventh lens and the total effective focal length of the optical lens is limited, the front-end light rays are further converged by the seventh lens with positive focal length, so that the light rays are smoothly converged to the image plane, which is beneficial to ensure that the system obtains the best imaging effect, thereby realizing high resolution of the optical lens.

[0127] According to the example embodiment of the present application, the optical lens can satisfy at least one of the following relationships: 0.7≤(F×θ) / D≤1.1, 0.1≤BFL / TTL≤0.3 and 0.14≤T_DIR / TTL≤0.3; to realize miniaturization of the optical lens; wherein F is the total effective focal length of the optical lens; θ is the radian value of the maximum field of view angle of the optical lens; D is the maximum light passing diameter of the first side of the first lens corresponding to the maximum field of view angle of the optical lens; BFL is the optical back focal length of the optical lens; TTL is the total optical length of the optical lens; T_DIR is the total air gap of all adjacent lenses in the optical lens on the optical axis.

[0128] In the example embodiment, the total effective focal length F of the optical lens, the radian value θ of the maximum field of view angle of the optical lens, and the maximum light passing diameter D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens can satisfy: 0.7≤(F×θ) / D≤1.1. Preferably, 0.8≤(F×θ) / D≤0.95. By controlling the relationship, the aperture of the front end of the lens can be reduced, which is beneficial to reduce the volume of the imaging system of the lens and realize small aperture of the optical lens.

[0129] In the example embodiments, the optical back focal length BFL of the optical lens and the total track length TTL of the optical lens can satisfy: 0.1≤BFL / TTL≤0.3. Preferably, 0.11≤BFL / TTL≤0.28. By controlling the relationship, the back focal length of the optical lens can be reasonably controlled, which is conducive to reserving space for the installation and focusing of the optical elements while ensuring miniaturization, and avoiding interference between structural members. It can be understood that if BFL / TTL<0.1, the equipment assembly and adjustment are not conducive, the assembly efficiency is reduced, and the installation cost is increased; if BFL / TTL>0.3, the volume of the optical system is easily too large, which is not conducive to the miniaturization of the optical lens.

[0130] In the example embodiments, the total air gap T_DIR of all adjacent lenses in the optical lens on the optical axis and the total track length TTL of the optical lens can satisfy: 0.14≤T_DIR / TTL≤0.3. Preferably, 0.16≤T_DIR / TTL≤0.27. By controlling the relationship, the proportion of invalid space can be compressed, and the structure of the optical system can be compacted; at the same time, the reduction of the air gap means the increase of the coupling degree between lenses, which also helps to reduce the assembly sensitivity of the lenses.

[0131] In the example embodiments, the focal length F1 of the first lens and the focal length F2 of the second lens satisfy: -0.26 / mm≤1 / F1+1 / F2≤-0.17 / mm. Preferably, -0.23 / mm≤1 / F1+1 / F2≤-0.2 / mm. By controlling the relationship, the optical lens has a larger field of view, and is also conducive to the miniaturization and high resolution of the optical lens. It can be understood that the focal lengths of the first lens and the second lens are both negative, and the relationship 1 / F1+1 / F2 plays a decisive role in the initial divergence of the incident light, which in turn affects the field of view, volume, aberration, etc. of the optical lens: if 1 / F1+1 / F2<-0.26 / mm, the divergence ability of the first lens and the second lens to the light is too strong, which makes the light excessively diverge before entering the third lens, significantly increases the incident height of the light on the third lens and the fourth lens, and thus introduces a large amount of coma and high-order aberration; at the same time, the excessive divergence of the light by the first lens and the second lens also increases the subsequent lens spacing to lengthen the convergence path, and forces the maximum aperture of the lens to increase, thereby making the overall volume of the optical lens larger; if 1 / F1+1 / F2>-0.17 / mm, the divergence of the light by the first lens and the second lens is weak, which reduces the light collection ability of the optical lens, thereby reducing the light flux of the lens, and thus the imaging effect is poor in a dark environment.

[0132] According to the exemplary embodiments of the present application, the optical lens satisfies at least one of the following relationships: 2.5≤F5 / F≤6, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm and -2.1≤F4 / TTL≤-1.2; or, the optical lens satisfies at least one of the following relationships: F5 / F≤-25, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm and -2.1≤F4 / TTL≤-1.2; to achieve high resolution of the optical lens; wherein F5 is the focal length of the fifth lens; F is the total effective focal length of the optical lens; F6 is the focal length of the sixth lens; F7 is the focal length of the seventh lens; F4 is the focal length of the fourth lens; and TTL is the total optical length of the optical lens.

[0133] In the exemplary embodiments, the focal length F5 of the fifth lens and the total effective focal length F of the optical lens can satisfy 2.5≤F5 / F≤6 or F5 / F≤-25. Preferably, 3.0≤F5 / F≤5 or -100≤F5 / F≤-25. By controlling the relationship, the focal length of the fifth lens is reasonably distributed, which can reduce the incident angle of light incident to the fifth lens, and is conducive to balancing the convergence difference of edge light and near-axis light, and reducing the coma of large field angle.

[0134] In the exemplary embodiments, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens can satisfy 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm. Preferably, 0.1 / mm≤1 / F6+1 / F7≤0.19 / mm. By controlling the relationship, it is helpful to improve the imaging quality and structural compactness of the optical lens, etc.

[0135] It is worth noting that if 1 / F6+1 / F7<0.09 / mm, the convergence ability of the sixth lens and the seventh lens to light will be insufficient, which cannot effectively compensate for the field curvature of the first five lenses, so that the spot diameter becomes large, which significantly affects the detection ability; and if 1 / F6+1 / F7>0.2 / mm, the radius of curvature of the sixth lens and the seventh lens will be too small, which will cause the spherical aberration to increase significantly. It can be understood that when light passes through a lens, if the refraction angle of the edge light is too large, the edge light and the near-axis light will be focused at different positions, forming spherical aberration; and the smooth light path can make the light of different heights converge at the same focal point by optimizing the curvature of the lens; in addition, by balancing the paths of edge light and near-axis light, the entire image plane can tend to be flat, avoiding edge blur.

[0136] In the exemplary embodiments, the focal length F4 of the fourth lens and the total track length TTL of the optical lens can satisfy: -2.1≤F4 / TTL≤-1.2. Preferably, -1.9≤F4 / TTL≤-1.4. By controlling the relationship, the slope of the light beam in the middle region can be effectively adjusted, and high resolution of the optical lens can be achieved. It can be understood that if F4 / TTL<-2.1, i.e. the focal length of the fourth lens is too long, the optical power is weak, the divergence ability of the fourth lens is insufficient, and the spherical aberration and coma of the first three lenses cannot be effectively compensated, resulting in the last three lenses needing to bear more correction pressure, which is easy to introduce field area and distortion; and if F4 / TTL>-1.1, i.e. the focal length of the fourth lens is too short, the optical power is strong, the divergence ability of the fourth lens is too strong, the light beam emitted by the fourth lens is excessively divergent, resulting in the last three lenses needing to converge with greater curvature, resulting in the increase of aberration (such as astigmatism, chromatic aberration, etc.) of the edge field of view, and the processing difficulty of the lens is increased.

[0137] In the exemplary embodiments, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy: 0.47≤CT6 / CT7≤1.85. Preferably, 0.5≤CT6 / CT7≤1.7. By controlling the relationship, the thicknesses of the sixth lens and the seventh lens are close, which facilitates the smooth convergence of light rays to the image plane, helps the optical lens to have small light deflection change at high and low temperatures, and ensures that the optical lens has good temperature performance.

[0138] In the exemplary embodiments, the total track length TTL of the optical lens and the maximum light aperture D on the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: 1.4≤TTL / D≤2.2. Preferably, 1.6≤TTL / D≤1.9. By controlling the relationship, the length of the optical lens can be ensured to be sufficient to support the effective spacing between the lenses, avoid the light power superposition out of control due to the excessive density of the lenses (such as insufficient spacing between positive and negative lenses, which cannot fully compensate for aberration, etc.), and also ensure that the lens aperture is not too small relative to the length of the lens, so as to ensure that the light aperture matches the focal length, avoid the vignetting effect caused by insufficient aperture, and improve the energy utilization rate and signal-to-noise ratio of the receiving system. It can be understood that if TTL / D<1.4, the spacing between the lenses will be too short, causing the light power of the positive and negative lenses to be unable to be effectively superimposed, thereby introducing more aberration; and if TTL / D>2.2, the lens aperture will be too small relative to the length of the lens, causing the light rays of the edge field of view to be blocked, thereby affecting the field angle of the optical lens.

[0139] In the example embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens can satisfy: 1≤F / ENPD≤1.5. Preferably, 1.2≤F / ENPD≤1.3. It can be understood that the aperture value of the receiving end lens of the laser radar is usually between 0.8 and 2.8, and the present application controls the relationship to make the optical lens have a smaller aperture value, which is beneficial to collect more light and realize clear imaging in a low light environment. Therefore, when the optical lens is used as the receiving end lens of the laser radar, the detection distance and detection accuracy of the laser radar can be effectively improved.

[0140] In the example embodiment, the total optical length TTL of the optical lens and the total effective focal length F of the optical lens can satisfy: 5.1≤TTL / F≤7. Preferably, 6≤TTL / F≤6.1. By controlling the relationship, the length of the optical lens can be effectively limited to realize the miniaturization of the optical lens.

[0141] In the example embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens can satisfy: 0.011 / °≤TTL / H / FOV≤0.016 / °. Preferably, TTL / H / FOV=0.014 / °. By controlling the relationship, the length of the lens can be effectively limited under the same image height and field of view ratio, which is convenient for realizing the miniaturization of the lens.

[0142] In the example embodiment, the maximum light passing aperture D on the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens can satisfy: 0.006 / °≤D / H / FOV≤0.009 / °. Preferably, 0.007 / °≤D / H / FOV≤0.008 / °. By controlling the relationship, the maximum light passing aperture of the lens can be effectively limited under the same image height and field of view ratio, which is convenient for realizing the miniaturization of the lens.

[0143] In the example embodiment, the maximum light passing aperture D on the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens can satisfy: 0.28≤D / H / F≤0.45. Preferably, 0.33≤D / H / F≤0.38. By controlling the relationship, the lens can be provided with the characteristics of large image height and small aperture under the condition of a certain focal length.

[0144] In the exemplary embodiment, the focal length F4 of the fourth lens and the combined focal length F123 of the first lens, the second lens and the third lens can satisfy: 0.137≤F4 / F123≤2.456. Preferably, 0.15≤F4 / F123≤2.2. By controlling the relationship, the divergence ability of the fourth lens is ensured to match the optical power of the combination of the first three lenses, so that the edge light rays are incident to the fourth lens with a moderate slope after passing through the first three lenses, avoiding the light rays from rising sharply in height due to strong convergence of the first three lenses and strong divergence of the fourth lens, which is beneficial to improve the overall resolving power of the optical lens.

[0145] The optical lens according to the above-described embodiments of the present application can employ multiple lenses, for example, the seven lenses described above. By reasonably allocating the optical parameters of each lens, the optical lens is small in aperture and size, high in resolving power, low in sensitivity, large in angular resolution, large in field of view, long in back focal length, small in distortion, small in chief ray angle, high in illumination, and processable, and can be well matched with various application end chips, for example, vehicle-mounted chips, and can better inhibit the dark corner phenomenon. The optical lens has good temperature performance, and the imaging effect changes little at high and low temperatures, and the image quality is stable. Therefore, the optical lens according to the above-described embodiments of the present application can better meet the requirements of, for example, vehicle-mounted applications.

[0146] Those skilled in the art should understand that the total optical length TTL of the optical lens used in the above is the axial distance from the first side of the first lens to the imaging surface or image source surface; the back focal length BFL of the optical lens is the axial distance from the second side of the seventh lens to the imaging surface or image source surface; and the maximum field of view FOV of the optical lens is related to the image height H, which refers to the corresponding field of view using the image height H.

[0147] In addition, the present application focuses on protecting the lens architecture, and the lens surface type is not limited to spherical or aspherical; if the focus is on the resolution quality, the lenses can all use aspherical lenses. The lens material is also not limited to plastic and glass; if the focus is on the temperature performance, the lenses can all use glass lenses.

[0148] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although the seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If necessary, the optical lens can also include other numbers of lenses. Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0149] Embodiment 1

[0150] The following refers to Figure 1 An optical lens according to Embodiment 1 of the present application is described. As shown in FIG. 1, the optical lens includes seven lenses, which are sequentially arranged from the object side to the image side as follows: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. Figure 1As shown, the optical lens comprises, in order along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. A stop STO can be disposed between the third lens L3 and the fourth lens L4.

[0151] The first lens L1 has a negative refractive power, the first side S1 thereof is convex, and the second side S2 thereof is concave.

[0152] The second lens L2 has a negative refractive power, the first side S3 thereof is convex, and the second side S4 thereof is concave.

[0153] The third lens L3 has a positive refractive power, the first side S5 thereof is convex, and the second side S6 thereof is convex.

[0154] The fourth lens L4 has a negative refractive power, the first side S7 thereof is convex, and the second side S8 thereof is concave.

[0155] The fifth lens L5 has a positive refractive power, the first side S9 thereof is concave, and the second side S10 thereof is convex.

[0156] The sixth lens L6 has a positive refractive power, the first side S11 thereof is convex, and the second side S12 thereof is convex.

[0157] The seventh lens L7 has a positive refractive power, the first side S13 thereof is convex, and the second side S14 thereof is convex.

[0158] The second side of the optical lens is provided with an image plane IMA, a filter IR and a protection glass CG are disposed between the seventh lens L7 and the image plane IMA, the filter IR has a first side S15 and a second side S16, and the protection glass CG has a first side S17 and a second side S18. When the IMA is an imaging plane, light from an object sequentially passes through each surface and is finally imaged on the image plane IMA. When the IMA is a light source plane, light from the IMA sequentially passes through each surface and is finally projected on an object. Table 1 shows the basic parameter table of the optical lens of Embodiment 1, the units of the radius of curvature and the thickness / distance are mm.

[0159] Table 1

[0160]

[0161] From Figure 2From the above, the RMS radii of the optical lens in Example 1 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 13.675um, 13.701um, 13.852um, 13.741um, 13.717um, 13.387um, 12.933um, 12.437um, 14.644um, 20.194um, 27.553um, and 34.358um, respectively. It is clear that the optical lens in Example 1 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 1 has good imaging quality.

[0162] Example 2

[0163] The following reference Figure 3 The optical lens according to embodiment 2 of the present application is described. Figure 3 As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different. Table 2 shows the basic parameters of the optical lens of embodiment 2.

[0164] Table 2

[0165]

[0166] from Figure 4 From the above, the RMS radii of the optical lens in Example 2 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 15.029um, 14.961um, 14.825um, 14.189um, 13.610um, 13.150um, 12.911um, 13.261um, 15.579um, 19.592um, 25.839um, and 32.599um, respectively. It is easy to see that the light spot diffraction and dispersion of the optical lens in Example 2 are small, and the energy concentration is high. Therefore, the optical lens provided in Example 2 has good imaging quality.

[0167] Example 3

[0168] The following reference Figure 5 The optical lens according to embodiment 3 of the present application is described. Figure 5As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens L7 is concave. Table 3 shows the basic parameters of the optical lens of Example 3.

[0169] Table 3

[0170]

[0171] from Figure 6 From the above, the RMS radii of the optical lens in Example 3 are respectively implemented as 9.824um, 9.558um, 9.291um, 10.030um, 11.716um, 13.536um, 14.420um, 14.418um, 14.562um, 21.242um, 33.114um, and 45.230um at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50°. It is easy to see that the light spot diffraction and dispersion of the optical lens in Example 3 are small and the energy concentration is high. Therefore, the optical lens provided in Example 3 has good imaging quality.

[0172] Example 4

[0173] The following reference Figure 7 The optical lens according to embodiment 4 of the present application is described. Figure 7 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens L7 is concave. Table 4 shows the basic parameters of the optical lens of Example 4.

[0174] Table 4

[0175]

[0176] from Figure 8From the above, the RMS radii of the optical lens in Example 4 are 10.371um, 10.136um, 9.784um, 10.012um, 10.841um, 11.949um, 12.651um, 13.213um, 14.352um, 21.222um, 33.230um, and 45.390um at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50°, respectively. It is clear that the optical lens in Example 4 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 4 has better imaging quality.

[0177] Example 5

[0178] The following reference Figure 9 The optical lens according to embodiment 5 of the present application is described. Figure 9 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the first side surface S13 of the seventh lens L7 is concave. Table 5 shows the basic parameters of the optical lens of Example 5.

[0179] Table 5

[0180]

[0181] from Figure 10 From the above, the RMS radii of the optical lens in Example 5 are 13.061um, 12.608um, 11.651um, 11.142um, 11.665um, 12.887um, 13.780um, 14.530um, 16.435um, 23.418um, 34.402um, and 45.168um at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50°, respectively. It is clear that the optical lens in Example 5 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 5 has better imaging quality.

[0182] Example 6

[0183] The following reference Figure 11 The optical lens according to embodiment 6 of the present application is described. Figure 11As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the first side surface S13 of the seventh lens L7 is concave. Table 6 shows the basic parameters of the optical lens of Example 6.

[0184] Table 6

[0185]

[0186] from Figure 12 From the above, the RMS radii of the optical lens in Example 6 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 13.761um, 13.314um, 12.377um, 11.863um, 12.350um, 13.608um, 14.401um, 14.779um, 16.902um, 23.860um, 34.608um, and 45.805um, respectively. It is clear that the optical lens in Example 6 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 6 has good imaging quality.

[0187] Example 7

[0188] The following reference Figure 13 The optical lens according to embodiment 7 of the present application is described. Figure 13 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S12 of the sixth lens L6 is concave. Table 7 shows the basic parameters of the optical lens of Example 7.

[0189] Table 7

[0190]

[0191] from Figure 14From the above, the RMS radii of the optical lens in Example 7 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 11.230 μm, 11.023 μm, 10.793 μm, 11.061 μm, 11.584 μm, 12.251 μm, 12.992 μm, 14.500 μm, 16.046 μm, 22.146 μm, 33.141 μm, and 45.301 μm, respectively. It is clear that the optical lens in Example 7 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 7 has good imaging quality.

[0192] Example 8

[0193] The following reference Figure 15 The optical lens according to Example 8 of the present application is described. Figure 15 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S12 of the sixth lens L6 is concave. Table 8 shows the basic parameters of the optical lens of Example 8.

[0194] Table 8

[0195]

[0196] from Figure 16 From the above, the RMS radii of the optical lens in Example 8 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 11.038um, 10.861um, 10.669um, 10.940um, 11.429um, 12.073um, 12.832um, 14.368um, 15.974um, 21.917um, 32.623um, and 45.018um, respectively. It is clear that the optical lens in Example 8 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 8 has good imaging quality.

[0197] Example 9

[0198] The following reference Figure 17 The optical lens according to Example 9 of the present application is described. Figure 17As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the first side surface S11 of the sixth lens L6 is concave. Table 9 shows the basic parameters of the optical lens of Example 9.

[0199] Table 9

[0200]

[0201] from Figure 18 From the above, the RMS radii of the optical lens in Example 9 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 11.073um, 11.079um, 11.185um, 11.432um, 11.364um, 11.269um, 11.611um, 13.364um, 14.927um, 20.489um, 31.110um, and 42.222um, respectively. It is clear that the optical lens in Example 9 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 9 has good imaging quality.

[0202] Example 10

[0203] The following reference Figure 19 The optical lens according to embodiment 10 of the present application is described. Figure 19 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the first side surface S11 of the sixth lens L6 is concave. Table 10 shows the basic parameters of the optical lens of Example 10.

[0204] Table 10

[0205]

[0206] from Figure 20From the above, the RMS radii of the optical lens in Example 10 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 10.348um, 10.759um, 11.333um, 11.970um, 11.867um, 11.255um, 11.111um, 12.918um, 15.893um, 22.031um, 32.769um, and 44.014um, respectively. It is clear that the optical lens in Example 10 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 10 has good imaging quality.

[0207] Example 11

[0208] The following reference Figure 21 The optical lens according to embodiment 11 of the present application is described. Figure 21 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the fifth lens has negative optical power, and the first side surface of the fifth lens is convex and the second side surface is concave; the first side surface S11 of the sixth lens L6 is concave. Table 11 shows the basic parameters of the optical lens of Example 11.

[0209] Table 11

[0210]

[0211] from Figure 22 From the above, the RMS radii of the optical lens in Example 11 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 11.660 μm, 11.545 μm, 10.626 μm, 9.154 μm, 8.013 μm, 8.271 μm, 9.514 μm, 11.826 μm, 14.526 μm, 17.886 μm, 23.205 μm, and 29.238 μm, respectively. It is clear that the optical lens in Example 11 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 11 has good imaging quality.

[0212] Example 12

[0213] The following reference Figure 23 The optical lens according to embodiment 12 of the present application is described. Figure 23As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens L7 is concave. Table 12 shows the basic parameters of the optical lens of Example 12.

[0214] Table 12

[0215]

[0216] from Figure 24 From the above, the RMS radii of the optical lens in Example 12 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 12.505um, 12.239um, 11.806um, 11.850um, 12.665um, 13.789um, 14.462um, 14.977um, 17.034um, 22.984um, 35.747um, and 43.343um, respectively. It is clear that the optical lens in Example 12 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 12 has good imaging quality.

[0217] Example 13

[0218] The following reference Figure 25 The optical lens according to embodiment 13 of the present application is described. Figure 25 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens L7 is concave. Table 13 shows the basic parameters of the optical lens of Example 13.

[0219] Table 13

[0220]

[0221] from Figure 26From the above, the RMS radii of the optical lens in Example 13 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 10.635um, 10.323um, 9.821um, 10.351um, 11.676um, 12.590um, 12.701um, 13.363um, 15.957um, 21.420um, 33.348um, and 44.758um, respectively. It is clear that the optical lens in Example 13 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 13 has good imaging quality.

[0222] Example 14

[0223] The following reference Figure 27 The optical lens according to embodiment 14 of the present application is described. Figure 27 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the fifth lens element has negative optical power, and the first side surface of the fifth lens element is convex and the second side surface is concave; the first side surface S11 of the sixth lens element L6 is concave. Table 14 shows the basic parameters of the optical lens of Example 14.

[0224] Table 14

[0225]

[0226] from Figure 28 From the above, the RMS radii of the optical lens in Example 14 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 12.531 μm, 12.737 μm, 12.884 μm, 12.301 μm, 11.625 μm, 10.867 μm, 10.942 μm, 12.197 μm, 14.761 μm, 18.483 μm, 24.541 μm, and 31.667 μm, respectively. It is clear that the optical lens in Example 14 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 14 has good imaging quality.

[0227] Example 15

[0228] The following reference Figure 29 The optical lens according to embodiment 15 of the present application is described. Figure 29As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the fifth lens element has negative optical power, and the first side surface of the fifth lens element is convex and the second side surface is concave; the first side surface S11 of the sixth lens element L6 is concave. Table 15 shows the basic parameters of the optical lens of Example 15.

[0229] Table 15

[0230]

[0231] from Figure 30 As can be seen, the RMS radii of the optical lens in Example 15 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are 12.604um, 12.509um, 12.402um, 12.470um, 12.499um, 11.765um, 11.701um, 12.666um, 15.734um, 20.781um, 27.222um, and 32.926um, respectively. It is clear that the optical lens in Example 15 has a smaller diffraction spot and higher energy concentration. Therefore, the optical lens in Example 15 has good imaging quality.

[0232] Comparative Example 1

[0233] The following reference Figure 31 The optical lens according to Comparative Example 1 of the present application is described. Figure 31 As shown, the main difference between this comparative example and Examples 1 to 15 lies in the different surface profiles of the fourth lens element. As can be seen from the foregoing, the first side surface S7 of the fourth lens element L4 in Examples 1 to 15 is convex, and the second side surface S8 is concave. In contrast, the first side surface S7 of the fourth lens element L4 in Comparative Example 1 is concave, and the second side surface S8 is convex. Table 16 shows the basic parameters of the optical lens element of Comparative Example 1.

[0234] Table 16

[0235]

[0236] From Table 16, it is easy to see that the total optical length TTL of the optical lens in Comparative Example 1 reaches 30.7964 mm, while the maximum TTL of Examples 1 to 15 is 22.4 mm, which is much smaller than the TTL of Comparative Example 1. Figure 32From the above, we can see that the RMS radius of the optical lens in Comparative Example 1 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are respectively implemented as 12.270um, 11.896um, 11.690um, 11.162um, 9.824um, 9.033um, 9.272um, 12.165um, 17.305um, 23.905um, 34.006um, and 45.929um. It is easy to see that the imaging performance of Comparative Example 1 is close to that of Examples 1 to 15. It can be seen that in the optical lens architecture provided in the present application, the surface shape of the fourth lens L4 has a great influence on the volume of the optical lens. Setting the first side surface S7 of the fourth lens L4 to a convex surface and the second side surface S8 to a concave surface can significantly reduce the total optical length TTL of the optical lens, which is conducive to the miniaturization design of the terminal device.

[0237] Comparative Example 2

[0238] The following reference Figure 33 The optical lens according to Comparative Example 2 of the present application is described. Figure 33 As shown, the main difference between this comparative example and Examples 1 to 15 is that the F1 / F3 ratios of Examples 1 to 15 all satisfy the relationship -0.9 ≤ F1 / F3 ≤ -0.5, while the F1 / F3 ratio of Comparative Example 2 is -0.417, exceeding the upper limit of the above conditional expression. Table 17 shows the basic parameters of the optical lens of Comparative Example 2.

[0239] Table 17

[0240]

[0241] from Figure 34 From the above, the RMS radii of the optical lens in Comparative Example 2 at field angles of 0.00°, 8.00°, 16.00°, 24.00°, 32.00°, 40.00°, 46.75°, 56.00°, 64.50°, 72.00°, 79.60°, and 85.50° are respectively implemented as 13.091um, 13.312um, 14.130um, 15.046um, 16.379um, 18.258um, 20.001um, 21.440um, 20.291um, 29.525um, 42.144um, and 50.897um. It is easy to see that the light spot diffraction and dispersion of the optical lens in Comparative Example 2 are larger than those in Examples 1 to 15, and the energy concentration is poor.

[0242] Therefore, based on the optical architecture provided in the embodiments of the present application, if F1 / F3 is greater than -0.5, the divergence state of the light rays exiting from the third lens L3 to the stop is too strong, so that the light rays exiting from the third lens L3 cannot be incident to the fourth lens L4 relatively gently, resulting in too large aberration and affecting the imaging quality.

[0243] Comparative Example 3

[0244] The following refers to Figure 35 An optical lens according to Comparative Example 3 of the present application is described. As shown in Table 18, the main difference between Comparative Example 3 and Examples 1-15 is that F1 / F3 of Comparative Example 3 is -1.097, which is outside the range -0.9≤F1 / F3≤-0.5 of Examples 1-15. Figure 35

[0245] Table 18

[0246]

[0247] As can be seen from Table 19-1 and Table 19-2 below, the entrance pupil diameter ENPD of the optical lens in Comparative Example 3 is equal to 2.657, while the entrance pupil diameter ENPD of the optical lenses in the remaining examples is greater than 2.888. It can be seen that, based on the optical architecture provided in the embodiments of the present application, if F1 / F3 is less than -0.9, the divergence state of the light rays exiting from L3 to the stop is too weak, which is not conducive to increasing the entrance pupil diameter of the optical lens.

[0248] Table 19-1 and Table 19-2 give the basic parameters of the optical lenses in Examples 1-15 and Comparative Examples 1-3, such as F, ENPD, TTL, H, FOV, θ, D, BFL, F1, F2, F3, F4, F5, F6, F7, R1, R3, R5, R6, R8, R9, R10, CT6, CT7, F13, T_DIR and L_stop.

[0249] Table 19-1

[0250]

[0251] Table 19-2

[0252]

[0253] In summary, the relationship in Examples 1-15 and Comparative Examples 1-3 satisfies the relationships shown in Table 20-1 and Table 20-2.

[0254] Table 20-1 ​

[0255]

[0256] Table 20-2

[0257]

[0258] The present application also provides an electronic device comprising the optical lens in the above example embodiments and at least one of an imaging element and a light source; wherein the imaging element is configured to convert optical image or optical information formed by the optical lens into an electrical signal; and wherein the light source is located at the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side of the optical lens.

[0259] It is worth noting that the electronic device can be implemented as a laser radar, a camera or a projection lamp, but is not limited thereto. Accordingly, the optical lens can be used as a light emitting lens or a light receiving lens. For example, when the electronic device is a camera, the electronic device can comprise the optical lens in the above example embodiments and a photosensor configured to convert optical image formed by the optical lens into an electrical signal, the photosensor being disposed at the second side of the optical lens, for example, on the imaging surface, and can be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0260] When the electronic device is a projection lamp, the electronic device can comprise the optical lens in the above example embodiments and a light source, the light source being located at the second side of the optical lens. The light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0261] In addition, when the electronic device is a laser radar, the receiving end lens of the laser radar can be implemented as the optical lens described above, the first side of the optical lens being the object side, and the second side of the optical lens being the image side.

[0262] It is worth noting that the electronic device implemented as a laser radar can include the first device and the second device, the first device can be implemented as a laser radar transmitting device, and the second device can be implemented as a laser radar receiving device. The first device can include the optical lens and the light source in the above exemplary embodiments, the light source is located at the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens and forms an image or illuminates an area on the first side. The second device can include the optical lens and the photoelectric sensor for converting the optical image formed by the optical lens into an electrical signal in the above exemplary embodiments, the photoelectric sensor is arranged at the second side of the optical lens (for example, arranged on the imaging surface), and the photoelectric sensor can be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), and the light from the first side is imaged on the second side after passing through the optical lens.

[0263] It is worth mentioning that the application also provides a vehicle, which can include the above electronic device for obtaining information.

[0264] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and also covers other technical solutions formed by any combinations of the above technical features or their equivalent features without departing from the concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An optical lens, characterized in that: The device comprises, in order from the first side to the second side along the optical axis: a first lens having negative optical power, wherein a first side surface of the first lens is convex and a second side surface of the first lens is concave; a second lens having negative optical power; a third lens having positive optical power, wherein the first side surface and the second side surface of the third lens are both convex surfaces; a fourth lens element having negative optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; The optical lens comprises seven lenses having optical power; the optical lens further comprises a stop disposed between the third lens and the fourth lens; The optical lens satisfies the following requirements: -0.9≤F1 / F3≤-0.5 and 1.7≤F3 / F≤2.8; Among them, F1 is the focal length of the first lens; F3 is the focal length of the third lens; and F is the total effective focal length of the optical lens.

2. The optical lens according to claim 1, wherein: A curvature radius R9 of the first side surface of the fifth lens and a curvature radius R10 of the second side surface of the fifth lens satisfy: 1≤R9 / R10≤4.

2.

3. The optical lens according to claim 1, wherein: A curvature radius R1 of the first side surface of the first lens and a curvature radius R3 of the first side surface of the second lens satisfy: 0.5≤R1 / R3≤3.

4. The optical lens according to claim 1, wherein: The optical lens satisfies at least one of the following relationships: 0.24≤L_stop / TTL≤0.41 and -0.3≤F3 / F4≤-0.17; Wherein, L_stop is the distance between the aperture and the first side surface of the first lens on the optical axis; TTL is the total optical length of the optical lens; F3 is the focal length of the third lens; and F4 is the focal length of the fourth lens.

5. The optical lens according to claim 1, wherein: The focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy the following: -1.9≤F1 / F≤-1.

2.

6. The optical lens according to claim 1 or claim 5, wherein: The focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -9≤F2 / F≤-5.

7. The optical lens according to claim 1, wherein: The focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy the following: 2.3≤F6 / F≤12.

8. The optical lens according to claim 1 or claim 7, wherein: The focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the following: 2.7≤F7 / F≤15.

9. The optical lens according to any one of claims 1 to 5 and 7, wherein: The optical lens satisfies at least one of the following relationships: 0.7≤(F×θ) / D≤1.1, 0.1≤BFL / TTL≤0.3, and 0.14≤T_DIR / TTL≤0.3; Wherein, F is the total effective focal length of the optical lens; θ is the radian value of the maximum field of view of the optical lens; D is the clear aperture corresponding to the maximum field of view of the optical lens on the first side surface of the first lens; BFL is the optical back focus of the optical lens; TTL is the total optical length of the optical lens; T_DIR is the sum of the air gaps between all adjacent lenses in the optical lens on the optical axis.

10. The optical lens according to any one of claims 1 to 5 and 7, wherein: The focal length F1 of the first lens and the focal length F2 of the second lens satisfy: -0.26 / mm≤1 / F1+1 / F2≤-0.17 / mm.

11. The optical lens according to any one of claims 1 to 5 and 7, wherein: The optical lens satisfies at least one of the following relationships: 2.5≤F5 / F≤6, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm, and -2.1≤F4 / TTL≤-1.2; or, the optical lens satisfies at least one of the following relationships: F5 / F≤-25, 0.09 / mm≤1 / F6+1 / F7≤0.2 / mm, and -2.1≤F4 / TTL≤-1.2; Among them, F5 is the focal length of the fifth lens; F is the total effective focal length of the optical lens; F6 is the focal length of the sixth lens; F7 is the focal length of the seventh lens; F4 is the focal length of the fourth lens; TTL is the total optical length of the optical lens.

12. The optical lens according to any one of claims 1 to 5 and claim 7, wherein: A center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy the following: 0.47≤CT6 / CT7≤1.

85.

13. The optical lens according to any one of claims 1 to 5 and 7, wherein: The total optical length TTL of the optical lens and the clear aperture D corresponding to the maximum field angle of the optical lens on the first side surface of the first lens satisfy the following conditions: 1.4≤TTL / D≤2.

2.

14. The optical lens according to any one of claims 1 to 5 and 7, wherein: The first side surface of the second lens is convex, and the second side surface of the second lens is concave; the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is concave.

15. The optical lens according to any one of claims 1 to 5 and 7, wherein: The fifth lens has positive power, a first side surface of the fifth lens is concave, a second side surface of the fifth lens is convex, and a focal length F5 of the fifth lens and a total effective focal length F of the optical lens satisfy the following: 2.5≤F5 / F≤6; Alternatively, the fifth lens has negative optical power, the first side surface of the fifth lens is convex, the second side surface of the fifth lens is concave, and the focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: F5 / F≤-25.

16. The optical lens according to any one of claims 1 to 5 and claim 7, wherein: The first side surface and the second side surface of the sixth lens are both convex surfaces; Alternatively, 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; Alternatively, the first side surface of the sixth lens is concave, and the second side surface of the sixth lens is convex.

17. The optical lens according to any one of claims 1 to 5 and claim 7, wherein: The first side surface and the second side surface of the seventh lens are both convex surfaces; Alternatively, the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a concave surface; Alternatively, the first side surface of the seventh lens is concave, and the second side surface of the seventh lens is convex.

18. The optical lens according to any one of claims 1 to 5 and claim 7, wherein: The optical lens satisfies at least one of the following relationships: -0.81≤F1 / F3≤-0.58, 1.9≤F3 / F≤2.5, 1≤R9 / R10≤3.7, 0.55≤R1 / R3≤2.7, 0.29≤L_stop / TTL≤0.36, -0.27≤F3 / F4≤-0.17, -1.7≤F1 / F≤-1.4, -7.5≤F2 / F≤-6, 2.5≤F6 / F≤11, 3≤F7 / F≤1 3. 0.8≤(F×θ) / D≤0.95, 0.11≤BFL / TTL≤0.28, 0.16≤T_DIR / TTL≤0.27, -0.23 / mm≤1 / F1+1 / F2≤-0.2 / mm, 3.0≤F5 / F≤5, 0.1 / mm≤1 / F6+1 / F7≤0.19 / mm, -1.9≤F4 / TTL≤-1.4, 0.5≤CT6 / CT7≤1.7 and 1.6≤TTL / D≤1.9; Alternatively, the optical lens satisfies at least one of the following relationships: -0.81≤F1 / F3≤-0.58, 1.9≤F3 / F≤2.5, 1≤R9 / R10≤3.7, 0.55≤R1 / R3≤2.7, 0.29≤L_stop / TTL≤0.36, -0.27≤F3 / F4≤-0.17, -1.7≤F1 / F≤-1.4, -7.5≤F2 / F≤-6, 2.5≤F6 / F≤11, 3≤F7 / F≤1 3. 0.8≤(F×θ) / D≤0.95, 0.11≤BFL / TTL≤0.28, 0.16≤T_DIR / TTL≤0.27, -0.23 / mm≤1 / F1+1 / F2≤-0.2 / mm, -100≤F5 / F≤-25, 0.1 / mm≤1 / F6+1 / F7≤0.19 / mm, -1.9≤F4 / TTL≤-1.4, 0.5≤CT6 / CT7≤1.7 and 1.6≤TTL / D≤1.9; Wherein, F1 is the focal length of the first lens; F3 is the focal length of the third lens; F is the total effective focal length of the optical 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; R1 is the curvature radius of the first side surface of the first lens; R3 is the curvature radius of the first side surface of the second lens; L_stop is the distance between the aperture and the first side surface of the first lens on the optical axis; TTL is the total optical length of the optical lens; F4 is the focal length of the fourth lens; F2 is the curvature radius of the second lens; F6 is the focal length of the sixth lens; F7 is the focal length of the seventh lens; θ is the radian value of the maximum field of view of the optical lens; D is the clear aperture corresponding to the maximum field of view of the optical lens on the first side surface of the first lens; BFL is the optical back focus of the optical lens; T_DIR is the sum of the air gaps of all adjacent lenses in the optical lens on the optical axis; F5 is the focal length of the fifth lens; CT6 is the center thickness of the sixth lens on the optical axis; CT7 is the center thickness of the seventh lens on the optical axis.

19. An electronic device, characterized in that include: The optical lens according to any one of claims 1 to 18; as well as at least one of an imaging element and a light source; The imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal; The light source is located on the second side of the optical lens, and the light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side of the optical lens.

Images