Imaging lens

Abstract

The utility model discloses an imaging lens. The utility model relates to a zoom lens, which sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with focal power from an object side to an image side along an optical axis, the first lens has focal power, the eighth lens has focal power, the ninth lens has positive focal power, the tenth lens has negative focal power, and the eleventh lens has positive focal power. Wherein the number of the lenses with the focal power of the imaging lens is 11. The combined focal length fa of the first lens to the fourth lens and the combined focal length fb of the fifth lens to the eleventh lens meet the condition that fa / fb is larger than or equal to 13.7 and smaller than or equal to 15.37.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to an imaging lens. BACKGROUND

[0002] With the development of science and technology, the demand for road monitoring is increasingly valued, and higher requirements are put forward for imaging lenses applicable to the field of road monitoring. For example, the imaging lens needs to have a wider use object distance range, a larger aperture and a higher resolution.

[0003] However, the imaging lens usually has some problems, for example, the imaging lens has a small aperture, the picture uniformity is not high, and the imaging quality is poor; or the use object distance of the imaging lens is narrow, which cannot meet the use demand of multiple scenes; or the imaging lens has poor picture quality in dim environment; or the main light angle of the imaging lens is large, which cannot be matched with multiple different chips. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an imaging lens, which comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, a seventh lens with refractive power, an eighth lens with refractive power, a ninth lens with positive refractive power, a tenth lens with negative refractive power, and an eleventh lens with positive refractive power. The number of lenses with refractive power in the imaging lens is eleven. The combined focal length fa of the first lens to the fourth lens and the combined focal length fb of the fifth lens to the eleventh lens satisfy: 13.7≤fa / fb≤15.37.

[0005] According to an example embodiment of the present application, the object side surface of the first lens is convex, and the image side surface is convex. The object side surface of the second lens is concave, and the image side surface is concave. The object side surface of the third lens is convex, and the image side surface is convex. The object side surface of the fourth lens is concave, and the image side surface is concave. The object side surface of the fifth lens is concave, and the image side surface is concave. The object side surface of the sixth lens is convex, and the image side surface is convex. The seventh lens and the eighth lens are meniscus lenses convex in different directions. The object side surface of the ninth lens is convex, and the image side surface is convex. The image side surface of the tenth lens is concave. The object side surface of the eleventh lens is convex, and the image side surface is convex.

[0006] According to an example embodiment of the present application, the first lens and the second lens are cemented to form a cemented lens; or, the third lens and the fourth lens are cemented to form a cemented lens; or, the fifth lens and the sixth lens are cemented to form a cemented lens; or, the seventh lens and the eighth lens are cemented to form a cemented lens; or, the ninth lens and the tenth lens are cemented to form a cemented lens; or, the seventh lens, the eighth lens and the ninth lens are cemented to form a cemented lens.

[0007] According to an example embodiment of the present application, the sign of the power of the seventh lens and the eighth lens are opposite.

[0008] According to an example embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions: 1.75≤f / f1≤2; -1.5≤f / f2≤-0.9; 0.9≤f12 / f≤1; wherein f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f12 is the combined focal length of the first lens and the second lens.

[0009] According to an example embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions: 1≤f / f3≤1.5; -3.2≤f / f4≤-2.8; wherein f is the total effective focal length of the imaging lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0010] According to an example embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions: -3≤f / f5≤-2.4; 1.2≤f / f6≤1.7; -1.3≤f56 / f≤-1; wherein f is the total effective focal length of the imaging lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

[0011] According to an example embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions: -2.5≤f / f10≤-0.5; 1.4≤f / f11≤1.55; wherein f is the total effective focal length of the imaging lens, f10 is the effective focal length of the tenth lens, and f11 is the effective focal length of the eleventh lens.

[0012] According to an example embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions: 2≤TTL / f≤2.5; 0.7≤BFL / f≤0.8; 0.3≤Dmax / TTL≤0.45; wherein TTL is the total track length of the imaging lens, f is the total effective focal length of the imaging lens, BFL is the back focal length of the imaging lens, and Dmax is the maximum aperture of the imaging lens.

[0013] According to one exemplary embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions:

[0014] 1.8≤f / f1≤1.92; -1.05≤f / f2≤-0.95; 1.05≤f / f3≤1.15; -3.05≤f / f4≤-2.85; -2.92≤f / f5≤-2.4; 1.25≤f / f6≤1.65; -1.2≤f56 / f≤-1; 1.2≤|f / f7|≤1.7; 1.7≤|f / f8|≤2.4; 1.5≤|f / f8|≤2.5; 1.5≤f / f9≤1.9; 1.65≤f / f9≤1.86; -2.25≤f / f10≤-0.85; 1.45≤f / f11≤1.55; 13.9≤fa / fb≤15.2; 1.3≤f / (R42-R51)≤1.35; 1.3≤f / (R42-R51)≤1.4; 0.7≤BFL / f≤0.76; 2.1≤TTL / f≤2.2; 0.35≤Dmax / TTL≤0.4;

[0015] wherein f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f12 is the combined focal length of the first lens and the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f56 is the combined focal length of the fifth lens and the sixth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, f9 is the effective focal length of the ninth lens, f10 is the effective focal length of the tenth lens, f11 is the effective focal length of the eleventh lens, fa is the combined focal length of the first lens to the fourth lens, fb is the combined focal length of the fifth lens to the eleventh lens, R42 is the radius of curvature of the image side surface of the fourth lens, R51 is the radius of curvature of the object side surface of the fifth lens, BFL is the back focal length of the imaging lens, TTL is the total optical length of the imaging lens, and Dmax is the maximum clear aperture of the lens in the imaging lens. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as taken in conjunction with the accompanying drawings. In the drawings:

[0017] Figure 1 A structure schematic diagram of the imaging lens according to Embodiment 1 of the present application is shown;

[0018] Figure 2 A distortion curve of the imaging lens according to Embodiment 1 of the present application is shown;

[0019] Figure 3A structural schematic diagram of the imaging lens according to Embodiment 2 of the present application is shown;

[0020] Figure 4 A distortion curve of the imaging lens according to Embodiment 2 of the present application is shown;

[0021] Figure 5 A structural schematic diagram of the imaging lens according to Embodiment 3 of the present application is shown;

[0022] Figure 6 A distortion curve of the imaging lens according to Embodiment 3 of the present application is shown;

[0023] Figure 7 A structural schematic diagram of the imaging lens according to Embodiment 4 of the present application is shown;

[0024] Figure 8 A distortion curve of the imaging lens according to Embodiment 4 of the present application is shown;

[0025] Figure 9 A structural schematic diagram of the imaging lens according to Embodiment 5 of the present application is shown;

[0026] Figure 10 A distortion curve of the imaging lens according to Embodiment 5 of the present application is shown. DETAILED DESCRIPTION

[0027] For better understanding of the present application, various aspects of the present application are described in detail with reference to the accompanying drawings. It should be understood that these detailed description is only a description of exemplary embodiments of the present application, and does not limit the scope of the present application in any way.

[0028] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake 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.

[0029] 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 object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0030] It should also be understood that the words "comprise", "comprising", "has", "having", "include", "including", "contain", "containing", "may" and / or "including", when used in this specification, specify the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or groups thereof. It should be noted that the expressions first, second, third and the like in this specification merely distinguish one feature from another feature, but do not imply any limitation on the features. It should be explained that the longitudinal direction stated herein is the direction perpendicular to the optical axis.

[0031] Unless otherwise defined, all terms used in this document have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms 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.

[0032] 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 accompanying drawings and in conjunction with the embodiments.

[0033] The imaging lens according to the exemplary embodiments of the present application can include, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens. Any two adjacent lenses among the first lens to the eleventh lens can have a separation distance.

[0034] In the exemplary embodiments, the imaging lens can include a prism located on the image side of the eleventh lens. The prism can be used to split the light into a first light path and a second light path, the first light path can be, for example, a light path corresponding to the visible light rays among the incident light rays, and the second light path can be, for example, a light path corresponding to the infrared light rays among the incident light rays. By using the color information characteristics of the visible light rays and the brightness information characteristics of the infrared light rays to obtain imaging information, respectively, and fusing the information of the two light paths, all-weather high-quality color imaging pictures can be achieved.

[0035] In the exemplary embodiments, the first lens and the second lens can be cemented to form a cemented lens. The third lens and the fourth lens can be cemented to form a cemented lens. The fifth lens and the sixth lens can be cemented to form a cemented lens. The seventh lens and the eighth lens can be cemented to form a cemented lens. The ninth lens and the tenth lens can be cemented to form a cemented lens.

[0036] In the exemplary embodiments, the first lens and the second lens can be cemented to form a cemented lens. The third lens and the fourth lens can be cemented to form a cemented lens. The fifth lens and the sixth lens can be cemented to form a cemented lens. The seventh lens, the eighth lens, and the ninth lens can be cemented to form a cemented lens.

[0037] In exemplary embodiments, the first lens can have positive refractive power. The object side surface of the first lens can be convex, and the image side surface can be convex. The first lens is a positive lens, and the first lens is configured to be biconvex, which can properly converge light rays from the object side, so that the light rays exiting the first lens are deflected toward the optical axis, and in the case of achieving a large aperture, the light passing aperture of the rear lens is compressed, which is conducive to the miniaturization of the imaging lens and reduces production costs. As an example, the first lens can use a material with high refractive index, which is conducive to quickly reducing the height of the light rays exiting the first lens, generating smaller field curvature and astigmatism, and improving the resolving power of the imaging lens.

[0038] In exemplary embodiments, the second lens can have negative refractive power. The object side surface of the second lens can be concave, and the image side surface can be concave. The second lens is a negative lens, and the second lens is configured to be biconcave, which, in the case of achieving a large aperture, can properly diverge the light rays from the first lens and smoothly transition to the rear system, reduce the sensitivity of the imaging lens, and improve the image quality of the imaging lens. It also helps to balance the high and low temperature characteristics of the imaging lens and achieve the athermalization of the imaging lens. The second lens and the first lens with positive refractive power are cemented to form a cemented lens, which can reduce the chromatic aberration generated by the imaging lens and reduce the generation of spherical aberration, astigmatism, and coma. It is conducive to improving the imaging quality of the imaging lens, and also helps to reduce the tolerance sensitivity of the imaging lens and improve the production yield of the imaging lens.

[0039] In exemplary embodiments, the third lens can have positive refractive power. The object side surface of the third lens can be convex, and the image side surface can be convex. The third lens is a positive lens, and the third lens is configured to be biconvex, which is conducive to properly converging the light rays passing through the second lens and reducing the light passing aperture of the rear lens, thereby achieving the miniaturization of the imaging lens. The third lens and the fourth lens with negative refractive power are cemented to form a cemented lens, which can effectively control the light ray trend, so that the light rays smoothly transition to the rear system, which is conducive to reducing the tolerance sensitivity of the imaging lens and improving the production yield of the imaging lens. It also helps to correct the system chromatic aberration and improve the imaging quality of the imaging lens.

[0040] In the example embodiment, the fourth lens can have negative refractive power. The object side surface of the fourth lens can be concave, and the image side surface can be concave. The fourth lens is a negative lens and is configured to be biconcave, which can properly diverge the light rays from the third lens and smoothly transition the light rays to the rear system, reduce the sensitivity of the imaging lens, and improve the image quality of the imaging lens. The fourth lens and the third lens with positive refractive power form a cemented lens, which can effectively correct the residual chromatic aberration and spherical aberration generated by the first lens and the second lens, ensure that the aperture stop lens group formed by the first lens to the fourth lens has good chromatic aberration and spherical aberration correction capability, and reduce the sensitivity of the aperture stop lens group.

[0041] In the example embodiment, the fifth lens can have negative refractive power. The object side surface of the fifth lens can be concave, and the image side surface can be concave. The fifth lens is a negative lens and is configured to be biconcave. The fifth lens and the sixth lens with positive refractive power form a cemented lens, which can effectively correct the chromatic aberration, spherical aberration, and astigmatism of the imaging lens, improve the resolving performance of the imaging lens, and effectively balance the high and low temperature performance of the imaging lens.

[0042] In the example embodiment, the sixth lens can have positive refractive power. The object side surface of the sixth lens can be convex, and the image side surface can be convex. The sixth lens is a positive lens and is configured to be biconvex. The sixth lens and the fifth lens with negative refractive power form a cemented lens, which can effectively correct the chromatic aberration of the imaging lens, improve the resolving performance of the imaging lens, and help reduce the generation of chromatic aberration, spherical aberration, astigmatism, and coma, thereby improving the image quality of the imaging lens.

[0043] In the example embodiment, the seventh lens can have positive refractive power. The object side surface of the seventh lens can be convex, and the image side surface can be convex. The seventh lens is a positive lens and is configured to be biconvex. The seventh lens and the eighth lens with negative refractive power form a cemented lens, which can effectively balance the high and low temperature characteristics of the imaging lens, achieve athermalization of the imaging lens, and correct the residual aberration and astigmatism generated by the fifth lens and the sixth lens, thereby improving the image quality of the imaging lens.

[0044] In the example embodiment, the seventh lens can have negative refractive power. The object side surface of the seventh lens can be concave, and the image side surface can be concave. The seventh lens is a negative lens and is configured to be biconcave. The seventh lens and the eighth lens with positive refractive power form a cemented lens, which can effectively balance the high and low temperature characteristics of the imaging lens, achieve athermalization of the imaging lens, and correct the residual aberration and astigmatism generated by the fifth lens and the sixth lens, thereby improving the image quality of the imaging lens.

[0045] In an exemplary embodiment, the eighth lens element may have negative optical power. Both the object-side surface and the image-side surface of the eighth lens element may be concave. Properly configuring the optical power and surface shape of the eighth lens element effectively controls the trajectory of light, ensuring a smooth transition of light rays raised by the fifth and sixth lenses to the rear image plane. This in turn allows the light rays to better match the chip size, facilitating the large image surface characteristics of the imaging lens.

[0046] In an exemplary embodiment, the eighth lens element may have positive optical power. Both the object-side surface and the image-side surface of the eighth lens element may be convex. The eighth lens element is a positive lens element with a biconvex configuration, which effectively controls the trajectory of light and compresses the angle of light emitted from the image-side surface of the eighth lens element. This allows the light rays, elevated by the fifth and sixth lenses, to smoothly transition to the rear image plane, thereby better matching the light to the chip size and facilitating the large image surface characteristics of the imaging lens.

[0047] In an exemplary embodiment, the ninth lens element may have positive refractive power. Both the object-side surface and the image-side surface of the ninth lens element may be convex. The ninth lens element is a positive lens element, and its biconvex shape effectively balances the high and low temperature characteristics of the imaging lens, achieving athermalization of the imaging lens.

[0048] In an exemplary embodiment, the tenth lens element may have negative optical power. The object-side surface of the tenth lens element may be convex or concave, and the image-side surface may be concave. The tenth lens element is a negative lens element with a concave image-side surface, effectively raising the light beam height, increasing the image plane and back focus length of the imaging lens, thereby achieving a large image area and long back focus. The tenth lens element is cemented with the ninth lens element, which has positive optical power, to form a cemented lens. This effectively corrects residual chromatic aberration generated by the preceding lenses, such as the first through eighth lenses, thereby improving image quality.

[0049] In an exemplary embodiment, the eleventh lens element may have positive optical power. The object-side surface and image-side surface of the eleventh lens element may be convex. The eleventh lens element is a positive lens element, and its biconvex configuration allows for appropriate convergence of light from the front and a smooth transition to the imaging plane. This effectively corrects residual aberrations and chromatic aberrations of the overall system, as well as residual astigmatism generated by the fifth through ninth lenses, thereby improving resolution. The eleventh lens element introduces positive distortion, effectively correcting overall distortion in the system and achieving low distortion in the imaging lens.

[0050] In an example embodiment, the imaging lens can further include a diaphragm. The diaphragm can be located between the fourth lens and the fifth lens. The lens group formed by the first lens to the fourth lens is a front diaphragm lens group, and the lens group formed by the fifth lens to the eleventh lens is a rear diaphragm lens group. The front diaphragm lens group and the rear diaphragm lens group form a double Gauss symmetric structure, thereby achieving a wide effective focal length range, while facilitating correction of the off-axis aberration and chromatic aberration of the imaging lens, further effectively reducing the tolerance sensitivity of the imaging lens, and improving the overall resolution performance and tolerance performance of the imaging lens.

[0051] In an example embodiment, the imaging lens can further include a filter for correcting color deviation.

[0052] In an example embodiment, the image height H corresponding to the maximum field of view angle of the imaging lens can satisfy: H≥17.5mm, and further, H can be 17.52mm.

[0053] In an example embodiment, the total effective focal length f of the imaging lens can satisfy: 45mm

[0054] In an example embodiment, any one of the first lens to the eleventh lens can be a glass lens or a plastic lens. The glass lens can effectively suppress the shift of the back focal length of the imaging lens due to temperature change, improve the stability of the imaging lens, effectively avoid imaging blur caused by high-temperature or low-temperature environment, ensure normal use of the imaging lens, facilitate the athermalization of the imaging lens, and better correct the system chromatic aberration, thereby improving the resolution capability of the imaging lens. The plastic lens can effectively reduce the cost of the imaging lens. As an example, any one of the first lens to the eleventh lens is a glass lens, which is conducive to improving the imaging quality and reliability of the imaging lens. For example, when the first lens to the eleventh lens are all glass lenses, the working temperature range of the imaging lens is wide, and the optical performance can be maintained stable in the range of -30°C to 75°C. As an example, part of the first lens to the eleventh lens is a glass lens, and the remaining part is a plastic lens. The imaging lens adopts a glass-plastic hybrid form, which can effectively reduce the cost of the imaging lens.

[0055] In the example embodiments, the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens can satisfy: 1.75≤f / f1≤2. In an example, 1.8≤f / f1≤1.92. Reasonably configuring the ratio of the total effective focal length of the imaging lens to the effective focal length of the first lens can properly converge the incident light, quickly reduce the height of the light exiting from the image side of the first lens, reduce the generation of field curvature and astigmatism, and improve the resolving power of the imaging lens. At the same time, it is also beneficial to reduce the aperture size of the rear lens, realize the miniaturization of the imaging lens, and reduce the production cost of the imaging lens.

[0056] In the example embodiments, the effective focal length f2 of the second lens and the total effective focal length f of the imaging lens can satisfy: -1.5≤f / f2≤-0.9. In an example, -1.05≤f / f2≤-0.95. Reasonably configuring the ratio of the total effective focal length of the imaging lens to the effective focal length of the second lens can properly diverge the light exiting from the first lens and smoothly transition to the rear system, which is beneficial to reduce the sensitivity of the imaging lens and improve the image quality of the imaging lens. At the same time, it is also beneficial to balance the high and low temperature characteristics of the imaging lens and realize the athermalization of the imaging lens.

[0057] In the example embodiments, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the imaging lens can satisfy: 0.9≤f12 / f≤1. Reasonably configuring the ratio of the combined focal length of the first lens and the second lens to the total effective focal length of the imaging lens can effectively reduce the chromatic aberration generated by the imaging lens. At the same time, the cemented lens formed by the first lens and the second lens generates positive spherical aberration, which can effectively balance the spherical aberration generated by other lenses, reduce the generation of aberration and coma, and improve the imaging quality of the imaging lens. At the same time, it is also beneficial to reduce the tolerance sensitivity of the imaging lens and improve the production yield of the imaging lens.

[0058] In the example embodiments, the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens can satisfy: 1≤f / f3≤1.5. In an example, 1.05≤f / f3≤1.15. Reasonably configuring the ratio of the total effective focal length of the imaging lens to the effective focal length of the third lens can properly converge the light exiting from the second lens, reduce the aperture size of the rear lens, and realize the miniaturization of the imaging lens. At the same time, it is also beneficial to correct the aberrations such as spherical aberration and coma generated by the first lens and the second lens, and further correct the chromatic aberration generated by the first lens and the second lens, thereby improving the resolving power.

[0059] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens can satisfy: -3.2≤f / f4≤-2.8. In an example, -3.05≤f / f4≤-2.85. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the fourth lens can properly diverge the light rays from the third lens and smoothly transition them to the rear system, which is conducive to achieving a large aperture; at the same time, it is conducive to reducing the sensitivity of the imaging lens, compensating for the spherical aberration and coma aberration and other aberrations generated by the first lens and the second lens, and further correcting the chromatic aberration generated by the first lens and the second lens, thereby improving the resolving power.

[0060] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens can satisfy: -3≤f / f5≤-2.4. In an example, -2.92≤f / f5≤-2.4. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the fifth lens is conducive to correcting aberrations, such as balancing the aberrations generated by the first lens to the fourth lens and avoiding the aberrations generated by the stop, thereby achieving high image quality and thermalization of the imaging lens; at the same time, it smoothly raises the large field of view light rays, changes the parallel light trend of the light beam to a divergent trend, which is conducive to achieving a large aperture of the imaging lens, lengthening the back focal length, and achieving a large target surface and a small chief ray angle of the imaging lens.

[0061] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens can satisfy: 1.2≤f / f6≤1.7. In an example, 1.25≤f / f6≤1.65. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the sixth lens is conducive to correcting aberrations, such as balancing the aberrations generated by the first lens to the fourth lens and avoiding the aberrations generated by the stop, thereby achieving high image quality and thermalization of the imaging lens; at the same time, it is conducive to smoothly raising the large field of view light ray trend, lengthening the back focal length, and achieving a large target surface and a small chief ray angle of the imaging lens.

[0062] In exemplary embodiments, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the imaging lens can satisfy: -1.3≤f56 / f≤-1. In an example, -1.2≤f56 / f≤-1. Reasonably configuring the ratio of the combined focal length of the fifth lens and the sixth lens and the total effective focal length of the imaging lens is conducive to reducing the residual chromatic aberration and aberration generated by the first lens to the fourth lens, thereby improving the resolving performance of the imaging lens; at the same time, it is conducive to smoothly raising the large field of view light ray trend, reducing the tolerance sensitivity of the imaging lens, and improving the production yield of the imaging lens.

[0063] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f7 of the seventh lens can satisfy: 1.2≤|f / f7|≤1.7. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the seventh lens helps to balance the high and low temperature characteristics of the imaging lens, realizes the athermalization of the imaging lens, and also corrects the residual spherical aberration and coma generated by the fifth lens and the sixth lens, thereby improving the image quality of the imaging lens.

[0064] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f8 of the eighth lens can satisfy: 1.5≤|f / f8|≤2.5. In an example, 1.7≤|f / f8|≤2.4. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the eighth lens can effectively control the light path, so that the light rays lifted by the fifth lens and the sixth lens transition smoothly to the rear image plane, which helps the light rays to better match the chip size and realize the large target surface characteristic.

[0065] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f9 of the ninth lens can satisfy: 1.5≤f / f9≤1.9. In an example, 1.65≤f / f9≤1.86. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the ninth lens can effectively compress the deflection angle of the light rays when exiting the ninth lens, so that the light rays change from a diverging trend to a converging trend, reduce the optical path, and reduce the clear aperture of the rear lens, which helps to realize the miniaturization and athermalization of the imaging lens. At the same time, it can also reduce the generation of spherical aberration, which helps to correct the coma generated by the imaging lens and ensure that the imaging lens has good tolerance performance.

[0066] In exemplary embodiments, the total effective focal length f of the imaging lens and the effective focal length f10 of the tenth lens can satisfy: -2.5≤f / f10≤-0.5. In an example, -2.25≤f / f10≤-0.85. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the tenth lens can effectively control the light path, properly diverge the light rays exiting the ninth lens, compensate for the correction of the small target surface caused by the ninth lens, and make the light rays better match the chip size, which helps to realize the large target surface characteristic of the imaging lens. At the same time, it is also helpful to correct the residual chromatic aberration generated by the first lens to the eighth lens, thereby improving the image quality of the imaging lens.

[0067] In the example embodiments, the total effective focal length f of the imaging lens and the effective focal length f11 of the eleventh lens can satisfy: 1.4≤f / f11≤1.55. In an example, 1.45≤f / f11≤1.55. Reasonably configuring the ratio of the total effective focal length of the imaging lens and the effective focal length of the eleventh lens can properly converge the light rays from the tenth lens, smoothly transition the light rays to the image plane, effectively correct the residual spherical aberration and residual chromatic aberration generated by the overall system, correct the residual astigmatism generated by the fifth lens to the ninth lens, improve the resolving power of the imaging lens, and at the same time introduce positive distortion, which can effectively correct the overall distortion of the system to achieve the small distortion characteristic of the imaging lens.

[0068] In the example embodiments, the combined focal length fa of the first lens to the fourth lens and the combined focal length fb of the fifth lens to the eleventh lens can satisfy: 13.7≤fa / fb≤15.37. In an example, 13.9≤fa / fb≤15.2. Reasonably configuring the focal length ratio of the front lens group and the rear lens group is conducive to achieving the large aperture characteristic of the imaging lens, lengthening the back focal length of the imaging lens, improving the image quality, and at the same time, reducing the tolerance sensitivity of the imaging lens and improving the production yield.

[0069] In the example embodiments, the total effective focal length f of the imaging lens, the curvature radius R42 of the image side of the fourth lens, and the curvature radius R51 of the object side of the fifth lens can satisfy: 1.3≤f / (R42-R51)≤1.4. In an example, 1.3≤f / (R42-R51)≤1.35. Reasonably configuring the relationship between the total effective focal length of the imaging lens, the curvature radius of the image side of the fourth lens, and the curvature radius of the object side of the fifth lens is helpful to achieve the large aperture characteristic of the imaging lens.

[0070] In the example embodiments, the back focal length BFL of the imaging lens and the total effective focal length f of the imaging lens can satisfy: 0.7≤BFL / f≤0.8. In an example, 0.7≤BFL / f≤0.76. Reasonably configuring the ratio of the back focal length of the imaging lens and the total effective focal length of the imaging lens can constrain the back focal length of the imaging lens on the basis of miniaturization, which is conducive to splitting light by a prism to obtain light information of different wavelengths and realizing the fusion of two light path information.

[0071] In the example embodiments, the total optical length TTL of the imaging lens and the total effective focal length f of the imaging lens can satisfy: 2≤TTL / f≤2.5. In an example, 2.1≤TTL / f≤2.2. Reasonably configuring the ratio of the total optical length of the imaging lens and the total effective focal length of the imaging lens is conducive to realizing the miniaturization of the imaging lens.

[0072] In the exemplary embodiments, the maximum total aperture Dmax of the lenses in the imaging lens and the total optical length TTL of the imaging lens can satisfy: 0.3≤Dmax / TTL≤0.45. In an example, 0.35≤Dmax / TTL≤0.4. The ratio of the maximum total aperture of the lenses in the reasonable configuration and the total optical length of the imaging lens, by restricting the maximum total aperture of the imaging lens, facilitates the miniaturization of the imaging lens under the condition that the total optical length of the imaging lens is constant.

[0073] The imaging lens according to the above embodiments of the present application can adopt multiple lenses, for example, the eleven lenses above, by reasonably allocating the optical parameters such as the focal length, surface type, etc. of each lens, at least one of high resolution, large aperture, large target, athermalization, wide use distance range, double optical path imaging, etc. can be achieved. The imaging lens provided by the present application has a large aperture, for example, FNO≥1.1, as an example, 1.2≤FNO≤1.6, which can maintain high-quality full-color monitoring pictures in a weak light environment of 0.0005Lux, and meet the 4K high image quality characteristics, while meeting the wide distance characteristics of 1.5m to infinity.

[0074] However, those skilled in the art should understand that the number of lenses constituting the imaging 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 specification.

[0075] The specific embodiments of the imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0076] Example 1

[0077] The following refers to Figure 1 An imaging lens according to Embodiment 1 of the present application is described. Figure 1 A structural schematic diagram of the imaging lens according to Embodiment 1 of the present application is shown.

[0078] As Figure 1 shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a prism PG along the optical axis from the object side to the image side. A stop STO is arranged between the fourth lens L4 and the fifth lens L5. The first lens L1 and the second lens L2 are cemented to form a cemented lens. The third lens L3 and the fourth lens L4 are cemented to form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented to form a cemented lens. The seventh lens L7, the eighth lens L8 and the ninth lens L9 are cemented to form a cemented lens.

[0079] The first lens L1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a convex surface.

[0080] The second lens L2 has negative refractive power, the object side surface S2 is a concave surface, and the image side surface S3 is a concave surface.

[0081] The third lens L3 has positive refractive power, the object side surface S4 is a convex surface, and the image side surface S5 is a convex surface.

[0082] The fourth lens L4 has negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0083] The fifth lens L5 has negative refractive power, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface.

[0084] The sixth lens L6 has positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.

[0085] The seventh lens L7 has positive refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface.

[0086] The eighth lens L8 has negative refractive power, the object side surface S12 is a concave surface, and the image side surface S13 is a concave surface.

[0087] The ninth lens L9 has positive refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a convex surface.

[0088] The tenth lens L10 has negative refractive power, the object side surface S15 is a convex surface, and the image side surface S16 is a concave surface.

[0089] The eleventh lens L11 has positive refractive power, the object side surface S17 is a convex surface, and the image side surface S18 is a convex surface.

[0090] The object side surface S19 and the image side surface S20 of the prism PG are planar surfaces.

[0091] Light from the object sequentially passes through the surfaces S1-S6, S8-S20 and is finally imaged on the imaging plane IMA. It should be noted that the surfaces S1-S6, S8-S20 are not shown in Figure 1 .

[0092] Table 1 shows the basic parameter table of the imaging lens of Embodiment 1, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0093]

[0094]

[0095] Table 1

[0096] In the embodiment, the value of the aperture number Fno of the imaging lens is 1.21. The value of the absolute value of the optical distortion DIS of the imaging lens is 2.27%. The value of the chief ray angle of the imaging lens is 9.81°.

[0097] Figure 2 The distortion curve of the imaging lens of embodiment 1 is shown. Therefore, the imaging lens given in embodiment 1 can achieve good imaging quality.

[0098] Example 2

[0099] The following refers to Figure 3 An imaging lens according to embodiment 2 of the present application is described. Figure 3 The structure diagram of the imaging lens according to embodiment 2 of the present application is shown.

[0100] As Figure 3 shown, the imaging lens sequentially includes, along the optical axis from the object side to the image 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, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a prism PG. A stop STO is arranged between the fourth lens L4 and the fifth lens L5. The first lens L1 and the second lens L2 are cemented to form a cemented lens. The third lens L3 and the fourth lens L4 are cemented to form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented to form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented to form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented to form a cemented lens.

[0101] The first lens L1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a convex surface.

[0102] The second lens L2 has negative refractive power, the object side surface S2 is a concave surface, and the image side surface S3 is a concave surface.

[0103] The third lens L3 has positive refractive power, the object side surface S4 is a convex surface, and the image side surface S5 is a convex surface.

[0104] The fourth lens L4 has negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0105] The fifth lens L5 has negative refractive power, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface.

[0106] The sixth lens L6 has positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.

[0107] The seventh lens L7 has negative refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface.

[0108] The eighth lens L8 has positive refractive power, the object-side surface S12 is convex, and the image-side surface S13 is convex.

[0109] The ninth lens L9 has positive refractive power, the object-side surface S14 is convex, and the image-side surface S15 is convex.

[0110] The tenth lens L10 has negative refractive power, the object-side surface S15 is concave, and the image-side surface S16 is concave.

[0111] The eleventh lens L11 has positive refractive power, the object-side surface S17 is convex, and the image-side surface S18 is convex.

[0112] The object-side surface S19 and the image-side surface S20 of the prism PG are planar.

[0113] Light from the object passes through the surfaces S1-S6, S8-S20 in sequence and is ultimately imaged on the image plane IMA. It should be noted that the surfaces S1-S6, S8-S20 are not shown in Figure 3 .

[0114] Table 2 shows the basic parameters of the imaging lens of Example 2, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0115]

[0116]

[0117] Table 2

[0118] In this embodiment, the value of the Fno of the imaging lens is 1.21. The absolute value of the DIS of the imaging lens is 2.01%. The value of the HFOV of the imaging lens is 9.72°.

[0119] Figure 4 The distortion curve of the imaging lens of Example 2 is shown. Therefore, the imaging lens given in Example 2 can achieve good imaging quality.

[0120] Example 3

[0121] The imaging lens according to Example 3 of the present application is described below with reference to Figure 5 . Figure 5 The structure of the imaging lens according to Example 3 of the present application is shown in FIG. 3.

[0122] As Figure 5As shown, the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a prism PG. A stop STO is disposed between the fourth lens L4 and the fifth lens L5. The first lens L1 and the second lens L2 are cemented to form a cemented lens. The third lens L3 and the fourth lens L4 are cemented to form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented to form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented to form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented to form a cemented lens.

[0123] The first lens L1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a convex surface.

[0124] The second lens L2 has negative refractive power, the object side surface S2 is a concave surface, and the image side surface S3 is a concave surface.

[0125] The third lens L3 has positive refractive power, the object side surface S4 is a convex surface, and the image side surface S5 is a convex surface.

[0126] The fourth lens L4 has negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0127] The fifth lens L5 has negative refractive power, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface.

[0128] The sixth lens L6 has positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.

[0129] The seventh lens L7 has negative refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface.

[0130] The eighth lens L8 has positive refractive power, the object side surface S12 is a convex surface, and the image side surface S13 is a convex surface.

[0131] The ninth lens L9 has positive refractive power, the object side surface S14 is a convex surface, and the image side surface S15 is a convex surface.

[0132] The tenth lens L10 has negative refractive power, the object side surface S15 is a concave surface, and the image side surface S16 is a concave surface.

[0133] The eleventh lens L11 has positive refractive power, the object side surface S17 is a convex surface, and the image side surface S18 is a convex surface.

[0134] The object side surface S19 and the image side surface S20 of the prism PG are flat surfaces.

[0135] The light from the object passes through the surfaces S1-S6, S8-S20 in sequence and is finally imaged on the imaging surface IMA. Figure 5 Not shown.

[0136] Table 3 shows the basic parameters of the imaging lens of Example 3, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0137]

[0138] Table 3

[0139] In this embodiment, the aperture number Fno of the imaging lens is 1.21, the absolute value of the optical distortion DIS of the imaging lens is 1.97%, and the principal ray angle of the imaging lens is 9.57°.

[0140] Figure 6 FIG3 shows the distortion curve of the imaging lens of Example 3. Therefore, the imaging lens of Example 3 can achieve good imaging quality.

[0141] Example 4

[0142] The following reference Figure 7 An imaging lens according to Example 4 of the present application will be described. Figure 7 Schematic diagram of the structure of an imaging lens according to Example 4 of the present application.

[0143] like Figure 7 As shown, the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a prism PG. A stop STO is disposed between the fourth lens L4 and the fifth lens L5. The first lens L1 and the second lens L2 are cemented together to form a cemented lens. The third lens L3 and the fourth lens L4 are cemented together to form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented together to form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens.

[0144] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0145] The second lens L2 has negative refractive power, and its object-side surface S2 and image-side surface S3 are concave.

[0146] The third lens L3 has positive refractive power, and its object-side surface S4 and image-side surface S5 are convex.

[0147] The fourth lens L4 has negative refractive power, the object side S5 is a concave surface, and the image side S6 is a concave surface.

[0148] The fifth lens L5 has negative refractive power, the object side S8 is a concave surface, and the image side S9 is a concave surface.

[0149] The sixth lens L6 has positive refractive power, the object side S9 is a convex surface, and the image side S10 is a convex surface.

[0150] The seventh lens L7 has negative refractive power, the object side S11 is a concave surface, and the image side S12 is a concave surface.

[0151] The eighth lens L8 has positive refractive power, the object side S12 is a convex surface, and the image side S13 is a convex surface.

[0152] The ninth lens L9 has positive refractive power, the object side S14 is a convex surface, and the image side S15 is a convex surface.

[0153] The tenth lens L10 has negative refractive power, the object side S15 is a concave surface, and the image side S16 is a concave surface.

[0154] The eleventh lens L11 has positive refractive power, the object side S17 is a convex surface, and the image side S18 is a convex surface.

[0155] The object side S19 and the image side S20 of the prism PG are planar surfaces.

[0156] The light from the object sequentially passes through the surfaces S1-S6, S8-S20 and finally forms an image on the image plane IMA. It should be noted that the surfaces S1-S6, S8-S20 are not shown in the Figure 7 .

[0157] Table 4 shows the basic parameters of the imaging lens of embodiment 4, wherein the units of the radius of curvature, thickness / distance are millimeter (mm).

[0158]

[0159]

[0160] Table 4

[0161] In this embodiment, the value of the Fno of the imaging lens is 1.21. The absolute value of the DIS of the imaging lens is 2.00%. The value of the HFOV of the imaging lens is 9.7°.

[0162] Figure 8 The distortion curve of the imaging lens of embodiment 4 is shown. Therefore, the imaging lens given in embodiment 4 can achieve good imaging quality.

[0163] Example 5

[0164] The following reference Figure 9 An imaging lens according to Example 5 of the present application will be described. Figure 9 Schematic diagram of the structure of an imaging lens according to Example 5 of the present application.

[0165] like Figure 9 As shown, the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a prism PG. A stop STO is disposed between the fourth lens L4 and the fifth lens L5. The first lens L1 and the second lens L2 are cemented together to form a cemented lens. The third lens L3 and the fourth lens L4 are cemented together to form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented together to form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens.

[0166] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0167] The second lens L2 has negative refractive power, and its object-side surface S2 and image-side surface S3 are concave.

[0168] The third lens L3 has positive refractive power, and its object-side surface S4 and image-side surface S5 are convex.

[0169] The fourth lens L4 has negative refractive power, and its object-side surface S5 and image-side surface S6 are concave.

[0170] The fifth lens L5 has negative refractive power, and its object-side surface S8 and image-side surface S9 are concave.

[0171] The sixth lens L6 has positive refractive power, and its object-side surface S9 and image-side surface S10 are convex.

[0172] The seventh lens L7 has negative refractive power, and its object-side surface S11 and image-side surface S12 are concave.

[0173] The eighth lens L8 has positive refractive power, and its object-side surface S12 and image-side surface S13 are convex.

[0174] The ninth lens L9 has positive refractive power, and its object-side surface S14 and image-side surface S15 are convex.

[0175] The tenth lens L10 has negative refractive power, and its object-side surface S15 and image-side surface S16 are concave.

[0176] The eleventh lens L11 has positive refractive power, the object side S17 is a convex surface, and the image side S18 is a convex surface.

[0177] The object side S19 and the image side S20 of the prism PG are planar surfaces.

[0178] Light from the object sequentially passes through the surfaces S1-S6, S8-S20 and is finally imaged on the imaging plane IMA. It should be noted that the surfaces S1-S6, S8-S20 are not shown in Figure 9

[0179] Table 5 shows the basic parameters of the imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0180]

[0181]

[0182] Table 5

[0183] In this embodiment, the value of the Fno of the imaging lens is 1.21. The absolute value of the DIS of the imaging lens is 1.84%. The value of the HFOV of the imaging lens is 10.29°.

[0184] Figure 10 The distortion curve of the imaging lens of Example 5 is shown. Therefore, the imaging lens given in Example 5 can achieve good imaging quality.

[0185] In summary, the conditional expressions in Examples 1-5 satisfy the relationships shown in Table 6.

[0186] Conditional / Example 1 2 3 4 5 f / f1 1.86 1.83 1.82 1.83 1.90 f / f2 -1.01 -0.98 -0.97 -0.98 -1.01 f12 / f 0.97 0.99 0.99 0.99 0.95 f / f3 1.07 1.09 1.09 1.09 1.12 f / f4 -2.96 -2.90 -2.90 -2.90 -3.02 f / f5 -2.89 -2.43 -2.44 -2.44 -2.43 f / f6 1.63 1.31 1.31 1.31 1.29 f56 / f -1.12 -1.15 -1.15 -1.15 -1.09 |f / f7| 1.23 1.61 1.61 1.61 1.66 |f / f8| 1.71 2.31 2.31 2.31 2.39 f / f9 1.84 1.69 1.69 1.69 1.73 f / f10 -0.88 -2.18 -2.19 -2.18 -2.22 f / f11 1.49 1.49 1.49 1.49 1.51 fa / fb 15.17 14.58 14.40 14.53 14.96 f / (R42-R51) 1.33 1.32 1.31 1.31 1.31 BFL / f 0.75 0.74 0.74 0.74 0.74 TTL / f 2.16 2.19 2.19 2.19 2.15 Dmax / TTL 0.39 0.38 0.38 0.38 0.39

[0187] Table 6

[0188] The present application also provides an imaging device, whose electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), which is equipped with the imaging lens described above.

[0189] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the 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 imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens element having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having optical power; an eighth lens having optical power; a ninth lens element having positive optical power; a tenth lens having negative optical power; Eleventh lens with positive refractive power The imaging lens has eleven lenses with optical power. The combined focal length fa of the first to fourth lenses and the combined focal length fb of the fifth to eleventh lenses satisfy the following: 13.7≤fa / fb≤15.

37.

2. The imaging lens according to claim 1, wherein: The object-side surface of the first lens is convex, and the image-side surface is convex; The object side surface of the second lens is concave, and the image side surface is concave; The object-side surface of the third lens is convex, and the image-side surface is convex; The object-side surface of the fourth lens is concave, and the image-side surface is concave; The object-side surface of the fifth lens is concave, and the image-side surface is concave; The object-side surface of the sixth lens is convex, and the image-side surface is convex; The object-side surface of the ninth lens is convex, and the image-side surface is convex; The image side surface of the tenth lens is concave; The object-side surface of the eleventh lens is convex, and the image-side surface is convex.

3. The imaging lens according to claim 1, wherein: The first lens and the second lens are cemented to form a cemented lens; or, The third lens and the fourth lens are cemented together to form a cemented lens; or, The fifth lens and the sixth lens are cemented together to form a cemented lens; or, The seventh lens and the eighth lens are cemented together to form a cemented lens; or, The ninth lens and the tenth lens are cemented together to form a cemented lens; or, The seventh lens, the eighth lens, and the ninth lens are cemented together to form a cemented lens.

4. The imaging lens according to claim 3, wherein: The signs of the optical powers of the seventh lens and the eighth lens are opposite in positive and negative properties.

5. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditional expressions: 1.75≤f / f1≤2; -1.5≤f / f2≤-0.9; 0.9≤f12 / f≤1; Wherein, f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f12 is the combined focal length of the first lens and the second lens.

6. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditional expressions: 1≤f / f3≤1.5; -3.2≤f / f4≤-2.8; Wherein, f is the total effective focal length of the imaging lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

7. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditional expressions: -3≤f / f5≤-2.4; 1.2≤f / f6≤1.7; -1.3≤f56 / f≤-1; Wherein, f is the total effective focal length of the imaging lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

8. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditional expressions: -2.5≤f / f10≤-0.5; 1.4≤f / f11≤1.55; Wherein, f is the total effective focal length of the imaging lens, f10 is the effective focal length of the tenth lens, and f11 is the effective focal length of the eleventh lens.

9. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditional expressions: 2≤TTL / f≤2.5; 0.7≤BFL / f≤0.8; 0.3≤Dmax / TTL≤0.45; Wherein, TTL is the total optical length of the imaging lens, f is the total effective focal length of the imaging lens, BFL is the back focal length of the imaging lens, and Dmax is the maximum clear aperture of the imaging lens.

10. The imaging lens according to any one of claims 1 to 4, wherein: The imaging lens satisfies at least one of the following conditions: 1.8≤f / f1≤1.92; -1.05≤f / f2≤-0.95; 1.05≤f / f3≤1.15; -3.05≤f / f4≤-2.85; -2.92≤f / f5≤-2.4; 1.25≤f / f6≤1.65; -1.2≤f56 / f≤-1; 1.2≤|f / f7|≤1.7; 1.7≤|f / f8|≤2.4; 1.5≤|f / f8|≤2.5; 1.5≤f / f9≤1.9; 1.65≤f / f9≤1.86; -2.25≤f / f10≤-0.85; 1.45≤f / f11≤1.55; 13.9≤fa / fb≤15.2; 1.3≤f / (R 42-R51)≤1.35; 1.3≤f / (R42-R51)≤1.4; 0.7≤BFL / f≤0.76; 2.1≤TTL / f≤2.2; 0.35≤Dmax / TTL≤0.4; Wherein, f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f12 is the combined focal length of the first and second lenses, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f56 is the combined focal length of the fifth and sixth lenses, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, f9 is the effective focal length of the ninth lens, f10 is the effective focal length of the tenth lens, f11 is the effective focal length of the eleventh lens, fa is the combined focal length of the first to fourth lenses, fb is the combined focal length of the fifth to eleventh lenses, R42 is the radius of curvature of the image-side surface of the fourth lens, R51 is the radius of curvature of the object-side surface of the fifth lens, BFL is the back focal length of the imaging lens, TTL is the total optical length of the imaging lens, and Dmax is the maximum clear aperture of the imaging lens.

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