Imaging lens

Abstract

The invention discloses an imaging lens. The invention 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 positive and negative attributes of the symbols of the focal power of the seventh lens and the eighth lens are opposite. The number of the lenses with the focal power of the imaging lens is 11.

Description

Technical Field

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

[0002] With the development of science and technology, the demand for road monitoring has become increasingly important, and higher requirements have been put forward for imaging lenses that can be used in the field of road monitoring. For example, the imaging lens needs to have a wider object distance range, a larger aperture and a higher resolution.

[0003] However, imaging lenses usually have some problems. For example, the imaging lens has a small aperture, low picture uniformity, and poor imaging quality; or the imaging lens has a narrow object distance and cannot meet the requirements of multiple scenes; or the imaging lens has poor image quality in dim environments; or the imaging lens has a large main light angle and cannot match a variety of different chips. Summary of the invention

[0004] On one hand, the present application provides such an imaging lens, which includes, from the object side to the image side along the optical axis, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with optical power, an eighth lens with optical power, a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with positive optical power. The signs of the optical power of the seventh lens and the eighth lens are opposite in positive and negative properties. The number of lenses with optical power in the imaging lens is eleven.

[0005] According to an exemplary 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 exemplary embodiment of the present application, the first lens and the second lens are cemented to form a cemented lens; the third lens and the fourth lens are cemented to form a cemented lens; and the fifth lens and the sixth lens are cemented to form a cemented lens.

[0007] According to an exemplary embodiment of the present application, the seventh lens and the eighth lens are cemented to form a cemented lens; and the ninth lens and the tenth lens are cemented to form a cemented lens.

[0008] According to an exemplary embodiment of the present application, the seventh lens, the eighth lens and the ninth lens are cemented to form a cemented lens.

[0009] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f1 of the first lens satisfy: 1.75≤f / f1≤2.

[0010] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f2 of the second lens satisfy: -1.5≤f / f2≤-0.9.

[0011] According to an exemplary embodiment of the present application, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the imaging lens satisfy: 0.9≤f12 / f≤1.

[0012] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: 1≤f / f3≤1.5.

[0013] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: -3.2≤f / f4≤-2.8.

[0014] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: -3≤f / f5≤-2.4.

[0015] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens satisfy: 1.2≤f / f6≤1.7.

[0016] According to an exemplary embodiment of the present application, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the imaging lens satisfy: -1.3≤f56 / f≤-1.

[0017] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f7 of the seventh lens satisfy: 1.2≤|f / f7|≤1.7.

[0018] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f8 of the eighth lens satisfy: 1.5≤|f / f8|≤2.5.

[0019] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f9 of the ninth lens satisfy: 1.5≤f / f9≤1.9.

[0020] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f10 of the tenth lens satisfy: -2.5≤f / f10≤-0.5.

[0021] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens and the effective focal length f11 of the eleventh lens satisfy: 1.4≤f / f11≤1.55.

[0022] According to an exemplary embodiment of the present application, the combined focal length fa of the first to fourth lenses and the combined focal length fb of the fifth to eleventh lenses satisfy: 13.7≤fa / fb≤15.37.

[0023] According to an exemplary embodiment of the present application, the total effective focal length f of the imaging lens, the curvature radius R42 of the image side surface of the fourth lens, and the curvature radius R51 of the object side surface of the fifth lens satisfy: 1.3≤f / (R42-R51)≤1.4.

[0024] According to an exemplary embodiment of the present application, the back focal length BFL of the imaging lens and the total effective focal length f of the imaging lens satisfy: 0.7≤BFL / f≤0.8.

[0025] According to an exemplary embodiment of the present application, the total optical length TTL of the imaging lens and the total effective focal length f of the imaging lens satisfy: 2≤TTL / f≤2.5.

[0026] According to an exemplary embodiment of the present application, the maximum full aperture Dmax of the lens in the imaging lens and the total optical length TTL of the imaging lens satisfy: 0.3≤Dmax / TTL≤0.45.

[0027] According to an exemplary embodiment of the present application, the imaging lens satisfies at least one of the following conditional expressions:

[0028] 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; 1.7≤|f / f8|≤2.4; 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; 0.7≤BFL / f≤0.76; 2.1≤TTL / f≤2.2; 0.35≤Dmax / TTL≤0.4;

[0029] 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 full aperture of the lenses in the imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. In the drawings:

[0031] Figure 1 A schematic structural diagram of an imaging lens according to Embodiment 1 of the present application is shown;

[0032] Figure 2 shows a distortion curve of the imaging lens according to Example 1 of the present application;

[0033] Figure 3 A schematic structural diagram of an imaging lens according to Embodiment 2 of the present application is shown;

[0034] Figure 4 shows a distortion curve of an imaging lens according to Embodiment 2 of the present application;

[0035] Figure 5 A schematic structural diagram of an imaging lens according to Embodiment 3 of the present application is shown;

[0036] Figure 6 shows a distortion curve of an imaging lens according to Embodiment 3 of the present application;

[0037] Figure 7 A schematic structural diagram of an imaging lens according to Embodiment 4 of the present application is shown;

[0038] Figure 8 shows a distortion curve of an imaging lens according to Embodiment 4 of the present application;

[0039] Fig. 9 A schematic structural diagram of an imaging lens according to Embodiment 5 of the present application is shown;

[0040] Fig.10 The distortion curve of the imaging lens according to Example 5 of the present application is shown. DETAILED DESCRIPTION

[0041] In order to better understand 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 descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way.

[0042] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0044] It should also be understood that the terms "include", "comprising", "having", "including" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. It should be noted that the longitudinal direction stated herein is the direction perpendicular to the optical axis.

[0045] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. Terms should be interpreted as having the same meaning as they have in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] The imaging lens according to the exemplary embodiment of the present application may include 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 arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses among the first lens to the eleventh lens may have a spacing distance therebetween.

[0048] In an exemplary embodiment, the imaging lens may include a prism located on the image side of the eleventh lens. The prism may be used to split the light into a first light path and a second light path, the first light path may be, for example, a light path corresponding to a visible light in the incident light, and the second light path may be, for example, a light path corresponding to an infrared light in the incident light. By using the color information characteristics of the visible light and the brightness information characteristics of the infrared light to respectively obtain imaging information, and fusing the information of the two light paths, it is possible to achieve all-weather high-quality color imaging images.

[0049] In an exemplary embodiment, the first lens and the second lens may be cemented to form a cemented lens. The third lens and the fourth lens may be cemented to form a cemented lens. The fifth lens and the sixth lens may be cemented to form a cemented lens. The seventh lens and the eighth lens may be cemented to form a cemented lens. The ninth lens and the tenth lens may be cemented to form a cemented lens.

[0050] In an exemplary embodiment, the first lens and the second lens may be cemented to form a cemented lens. The third lens and the fourth lens may be cemented to form a cemented lens. The fifth lens and the sixth lens may be cemented to form a cemented lens. The seventh lens, the eighth lens, and the ninth lens may be cemented to form a cemented lens.

[0051] In an exemplary embodiment, the first lens may have a positive optical power. The object side surface of the first lens may be a convex surface, and the image side surface may be a convex surface. The first lens is a positive lens, and the first lens is set to be biconvex, which can appropriately converge the light from the object side, so that the light emitted from the first lens is deflected in a direction close to the optical axis. When a large aperture is achieved, the aperture of the rear lens is compressed, which is conducive to miniaturization of the imaging lens and reduction of production costs. As an example, the first lens can be made of a material with a high refractive index, which is conducive to quickly reducing the height of the light emitted from the first lens, generating smaller field curvature and astigmatism, and improving the resolution performance of the imaging lens.

[0052] In an exemplary embodiment, the second lens may have negative optical power. The object side surface of the second lens may be concave, and the image side surface may be concave. The second lens is a negative lens, and the second lens is set to be biconcave. When a large aperture is achieved, the light from the first lens can be appropriately diverged and smoothly transitioned to the rear system, thereby reducing the sensitivity of the imaging lens and improving the image quality of the imaging lens. It also helps to balance the high and low temperature characteristics of the imaging lens and achieve athermalization of the imaging lens. The second lens is bonded to the first lens with positive optical power to form a bonded lens, which can reduce the chromatic aberration generated by the imaging lens, and reduce the generation of spherical aberration, astigmatism and coma, which is beneficial to improving the imaging quality of the imaging lens. It also helps to reduce the tolerance sensitivity of the imaging lens and improve the production yield of the imaging lens.

[0053] In an exemplary embodiment, the third lens may have positive optical power. The object side surface of the third lens may be convex, and the image side surface may be convex. The third lens is a positive lens, and the third lens is set to be biconvex, which is conducive to properly converging the light passing through the second lens, reducing the aperture of the rear lens, and realizing the miniaturization of the imaging lens. The third lens is bonded with the fourth lens with negative optical power to form a bonded lens, which can effectively control the trend of light, so that the light smoothly transitions 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; at the same time, it is also conducive to correcting the system chromatic aberration and improving the imaging quality of the imaging lens.

[0054] In an exemplary embodiment, the fourth lens may have negative power. The object side surface of the fourth lens may be concave, and the image side surface may be concave. The fourth lens is a negative lens, and the fourth lens is set to be biconcave, which can appropriately diverge the light from the third lens and smoothly transition it to the rear system, reduce the sensitivity of the imaging lens, and improve the image quality of the imaging lens. The fourth lens is cemented with the third lens having positive power to 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 front group lens group formed by the first lens to the fourth lens has good chromatic aberration and spherical aberration correction capabilities, and reduce the sensitivity of the aperture front lens group.

[0055] In an exemplary embodiment, the fifth lens may have negative power. The object side surface of the fifth lens may be concave, and the image side surface may be concave. The fifth lens is a negative lens and is arranged in a biconcave shape. The fifth lens is cemented with the sixth lens having positive power to form a cemented lens, which can effectively correct the chromatic aberration, spherical aberration and astigmatism of the imaging lens, improve the resolution performance of the imaging lens, and effectively balance the high and low temperature performance of the imaging lens.

[0056] In an exemplary embodiment, the sixth lens may have positive power. The object side surface of the sixth lens may be convex, and the image side surface may be convex. The sixth lens is a positive lens and is arranged in a biconvex shape. The sixth lens is cemented with the fifth lens having negative power to form a cemented lens, which can effectively correct the chromatic aberration of the imaging lens, improve the resolution performance of the imaging lens, and at the same time help to reduce the generation of chromatic aberration, spherical aberration, astigmatism, and coma, and improve the image quality of the imaging lens.

[0057] In an exemplary embodiment, the seventh lens may have positive power. The object side surface of the seventh lens may be convex, and the image side surface may be convex. The seventh lens is a positive lens and is arranged in a biconvex shape. The seventh lens is cemented with the eighth lens having negative power to form a cemented lens, which can effectively balance the high and low temperature characteristics of the imaging lens and realize the athermalization of the imaging lens; at the same time, the residual aberration and astigmatism generated by the fifth lens and the sixth lens can be corrected to improve the image quality of the imaging lens.

[0058] In an exemplary embodiment, the seventh lens may have negative power. The object side surface of the seventh lens may be concave, and the image side surface may be concave. The seventh lens is a negative lens and is arranged in a biconcave shape. The seventh lens is cemented with the eighth lens having positive power to form a cemented lens, which can effectively balance the high and low temperature characteristics of the imaging lens and realize the athermalization of the imaging lens; at the same time, the residual aberration and astigmatism generated by the fifth lens and the sixth lens can be corrected to improve the image quality of the imaging lens.

[0059] In an exemplary embodiment, the eighth lens may have negative optical power. The object side surface of the eighth lens may be a concave surface, and the image side surface may be a concave surface. Reasonable configuration of the optical power and surface shape of the eighth lens can effectively control the trend of light, so that the light raised by the fifth lens and the sixth lens smoothly transitions to the rear image surface, thereby making the light better match the chip size, which is conducive to realizing the large target surface characteristics of the imaging lens.

[0060] In an exemplary embodiment, the eighth lens may have positive power. The object side surface of the eighth lens may be convex, and the image side surface may be convex. The eighth lens is a positive lens and is arranged in a biconvex shape, which can effectively control the trend of light, compress the angle of light emission on the image side surface of the eighth lens, so that the light raised by the fifth lens and the sixth lens smoothly transitions to the rear image surface, thereby making the light better match the chip size, which is conducive to realizing the large target surface characteristics of the imaging lens.

[0061] In an exemplary embodiment, the ninth lens may have positive power. The object side surface of the ninth lens may be convex, and the image side surface may be convex. The ninth lens is a positive lens, and the ninth lens is set to be biconvex, which can effectively balance the high and low temperature characteristics of the imaging lens and realize the athermalization of the imaging lens.

[0062] In an exemplary embodiment, the tenth lens may have negative power. The object side surface of the tenth lens is convex or concave, and the image side surface may be concave. The tenth lens is a negative lens, and its image side surface is set to be concave, which can effectively raise the height of the light, increase the image surface and back focus length of the imaging lens, thereby achieving a large target surface and long back focus characteristics of the imaging lens. The tenth lens is cemented with the ninth lens having positive power to form a cemented lens, which can effectively correct the residual chromatic aberration generated by the front lenses such as the first lens to the eighth lens, and improve the image quality of the imaging lens.

[0063] In an exemplary embodiment, the eleventh lens may have positive power. The object side surface of the eleventh lens may be convex, and the image side surface may be convex. The eleventh lens is a positive lens, and the eleventh lens is set to be biconvex, which can appropriately converge the light from the front and smoothly transition it to the imaging surface, while effectively correcting the residual aberration and residual chromatic aberration of the overall system, as well as the residual astigmatism generated by the fifth lens to the ninth lens, and improving the resolution capability. The eleventh lens introduces positive distortion, which can effectively correct the overall distortion of the system, thereby achieving low distortion of the imaging lens.

[0064] In an exemplary embodiment, the imaging lens may further include an aperture. The aperture may be located between the fourth lens and the fifth lens. The lens group formed by the first lens to the fourth lens is the aperture front lens group, and the lens group formed by the fifth lens to the eleventh lens is the aperture rear lens group. The aperture front lens group and the aperture rear lens group form a double Gaussian symmetric structure, thereby achieving a wide range of object distances, while facilitating the correction of off-axis aberrations and chromatic aberrations 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.

[0065] In an exemplary embodiment, the imaging lens may further include a filter for correcting color deviation.

[0066] In an exemplary embodiment, the image height H corresponding to the maximum field angle of the imaging lens may satisfy: H ≥ 17.5 mm, and further, H may be 17.52 mm.

[0067] In an exemplary embodiment, the total effective focal length f of the imaging lens may satisfy: 45 mm < f < 55 mm, and further, f may be 50 mm.

[0068] In an exemplary embodiment, any one of the first to eleventh lenses may be a glass lens or a plastic lens. The glass lens can effectively suppress the deviation of the back focal length of the imaging lens caused by temperature changes, and improve the stability of the imaging lens; at the same time, the glass lens can effectively avoid the problem of imaging blur caused by high temperature environment or low temperature environment, ensure the normal use of the imaging lens, and is conducive to realizing the athermalization of the imaging lens, and better corrects the system chromatic aberration, and improves the resolution ability of the imaging lens. The plastic lens can effectively reduce the cost of the imaging lens. As an example, any one of the first to eleven lenses is a glass lens, which is conducive to improving the imaging quality and reliability of the imaging lens; for example, when the first to eleven lenses are all glass lenses, the operating temperature range of the imaging lens is wider, and stable optical performance can be maintained in the range of -30°C to 75°C. As an example, some of the lenses in the first to eleven lenses are glass lenses, and the remaining lenses are plastic lenses. The imaging lens adopts a glass-plastic hybrid form, which can effectively reduce the cost of the imaging lens.

[0069] In an exemplary embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens may satisfy: 1.75≤f / f1≤2. In one example, 1.8≤f / f1≤1.92. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the first lens can appropriately converge the incident light, quickly reduce the height of the light when it emerges from the image side of the first lens, reduce the generation of field curvature and astigmatism, and improve the resolution 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.

[0070] In an exemplary embodiment, 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 one example, -1.05≤f / f2≤-0.95. Reasonable configuration of 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 emitted by the first lens and make it 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 beneficial to balance the high and low temperature characteristics of the imaging lens and realize the athermalization of the imaging lens.

[0071] In an exemplary embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the imaging lens may satisfy: 0.9≤f12 / f≤1. Reasonable configuration of 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 produced by the imaging lens. At the same time, the cemented lens formed by the first lens and the second lens produces positive spherical aberration, which can effectively balance the spherical aberration produced by other lenses, reduce the generation of aberrations and coma, and improve the imaging quality of the imaging lens; at the same time, it is beneficial to reduce the tolerance sensitivity of the imaging lens and improve the production yield of the imaging lens.

[0072] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens may satisfy: 1≤f / f3≤1.5. In one example, 1.05≤f / f3≤1.15. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the third lens can appropriately converge the light emitted by 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 beneficial to correct 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 resolution capability.

[0073] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens may satisfy: -3.2≤f / f4≤-2.8. In one example, -3.05≤f / f4≤-2.85. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the fourth lens can properly diverge the light from the third lens and smoothly transition it 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 aberrations such as spherical aberration and coma 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 resolution capability.

[0074] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens may satisfy: -3≤f / f5≤-2.4. In one example, -2.92≤f / f5≤-2.4. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the fifth lens is conducive to correcting aberrations, for example, balancing the aberrations generated by the first to fourth lenses and avoiding aberrations generated by the aperture, thereby achieving high image quality and athermalization of the imaging lens; at the same time, the light of a large field of view is steadily raised, so that the parallel light trend of the light beam is transformed into a divergent trend, which is conducive to realizing a large aperture of the imaging lens, lengthening the back focus length, and realizing a large target surface and a small principal light angle of the imaging lens.

[0075] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens may satisfy: 1.2≤f / f6≤1.7. In one example, 1.25≤f / f6≤1.65. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the sixth lens is conducive to correcting aberrations, for example, balancing the aberrations generated by the first lens to the fourth lens and avoiding aberrations generated by the aperture, which is conducive to achieving high image quality and athermalization of the imaging lens; at the same time, it is conducive to smoothly raising the light trend of a large field of view, lengthening the back focus length, and realizing a large target surface and a small principal light angle of the imaging lens.

[0076] In an exemplary embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the imaging lens may satisfy: -1.3≤f56 / f≤-1. In one example, -1.2≤f56 / f≤-1. Reasonable configuration of the ratio of the combined focal length of the fifth lens and the sixth lens to 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, and improving the resolution performance of the imaging lens; at the same time, it is conducive to smoothly raising the large field of view light trend, reducing the tolerance sensitivity of the imaging lens, and improving the production yield of the imaging lens.

[0077] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f7 of the seventh lens may satisfy: 1.2≤|f / f7|≤1.7. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the seventh lens is conducive to balancing the high and low temperature characteristics of the imaging lens, achieving athermalization of the imaging lens, and at the same time correcting the residual spherical aberration and astigmatism generated by the fifth lens and the sixth lens, thereby improving the image quality of the imaging lens.

[0078] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f8 of the eighth lens may satisfy: 1.5≤|f / f8|≤2.5. In one example, 1.7≤|f / f8|≤2.4. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the eighth lens can effectively control the light trend, so that the light lifted by the fifth lens and the sixth lens smoothly transitions to the rear image plane, which is conducive to better matching the light with the chip size and achieving large target surface characteristics.

[0079] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f9 of the ninth lens may satisfy: 1.5≤f / f9≤1.9. In one example, 1.65≤f / f9≤1.86. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the ninth lens can effectively compress the deflection angle of the light when it is emitted from the ninth lens, so that the light is converted from a divergent trend to a convergent trend, reducing the optical path and reducing the aperture of the rear lens, which is conducive to miniaturization and athermalization of the imaging lens; at the same time, it can also reduce the generation of spherical aberration, which is conducive to correcting the coma generated by the imaging lens, and ensuring that the imaging lens has good tolerance performance.

[0080] In an exemplary embodiment, 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 one example, -2.25≤f / f10≤-0.85. Reasonable configuration of the ratio of the total effective focal length of the imaging lens to the effective focal length of the tenth lens can effectively control the trend of light, properly diverge the light emitted by the ninth lens, compensate for the small target surface caused by the ninth lens, make the light better match the chip size, and help to achieve the large target surface characteristics of the imaging lens; at the same time, it is also beneficial to the residual chromatic aberration generated by the front lenses such as the first lens to the eighth lens, and improve the image quality of the imaging lens.

[0081] In an exemplary embodiment, the total effective focal length f of the imaging lens and the effective focal length f11 of the eleventh lens may satisfy: 1.4≤f / f11≤1.55. In one example, 1.45≤f / f11≤1.55. By rationally configuring the ratio of the total effective focal length of the imaging lens to the effective focal length of the eleventh lens, the light from the tenth lens can be properly converged, so that the light can smoothly transition 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 to ninth lenses, and improve the resolution of the imaging lens; at the same time, the introduction of positive distortion can effectively correct the overall distortion of the system and achieve the small distortion characteristics of the imaging lens.

[0082] In an exemplary embodiment, the combined focal length fa of the first to fourth lenses and the combined focal length fb of the fifth to eleventh lenses may satisfy: 13.7≤fa / fb≤15.37. In one example, 13.9≤fa / fb≤15.2. Reasonable configuration of the focal length ratio of the lens group before the aperture and the lens group after the aperture 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 helping to reduce the tolerance sensitivity of the imaging lens and improve the production yield.

[0083] In an exemplary embodiment, the total effective focal length f of the imaging lens, the curvature radius R42 of the image side surface of the fourth lens, and the curvature radius R51 of the object side surface of the fifth lens may satisfy: 1.3≤f / (R42-R51)≤1.4. In one example, 1.3≤f / (R42-R51)≤1.35. Reasonable configuration of the relationship between the total effective focal length of the imaging lens, the curvature radius of the image side surface of the fourth lens, and the curvature radius of the object side surface of the fifth lens helps to achieve the large aperture characteristics of the imaging lens.

[0084] In an exemplary embodiment, the back focal length BFL of the imaging lens and the total effective focal length f of the imaging lens may satisfy: 0.7≤BFL / f≤0.8. In one example, 0.7≤BFL / f≤0.76. Reasonable configuration of the ratio of the back focal length of the imaging lens to the total effective focal length of the imaging lens constrains the back focal length of the imaging lens on the basis of miniaturization, which is conducive to obtaining light information of different wavelengths through prism splitting and realizing the fusion of information of two optical paths.

[0085] In an exemplary embodiment, the total optical length TTL of the imaging lens and the total effective focal length f of the imaging lens may satisfy: 2≤TTL / f≤2.5. In one example, 2.1≤TTL / f≤2.2. Reasonable configuration of the ratio of the total optical length of the imaging lens to the total effective focal length of the imaging lens is conducive to miniaturization of the imaging lens.

[0086] In an exemplary embodiment, the maximum clear aperture Dmax of the lens in the imaging lens and the total optical length TTL of the imaging lens may satisfy: 0.3≤Dmax / TTL≤0.45. In one example, 0.35≤Dmax / TTL≤0.4. The ratio of the maximum clear aperture of the lens in a reasonable configuration to the total optical length of the imaging lens is conducive to miniaturization of the imaging lens by constraining the maximum clear aperture of the imaging lens when the total optical length of the imaging lens is constant.

[0087] The imaging lens according to the above-mentioned embodiment of the present application can use multiple lenses, such as the eleven lenses mentioned above, and by reasonably allocating the optical parameters such as the focal length and surface shape of each lens, it can achieve at least one of high resolution, large aperture, large target surface, athermalization, wide range of object distance, dual-light path imaging, etc. The imaging lens provided in the present application has a large aperture, such as FNO ≥ 1.1, as an example, 1.2 ≤ FNO ≤ 1.6, which can maintain high-quality full-color monitoring images in a weak light environment of 0.0005 Lux, and meet the 4K high image quality characteristics, while meeting the wide object distance characteristics of 1.5m to infinity.

[0088] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging lens can be changed to obtain the various results and advantages described in this specification.

[0089] Specific embodiments of the imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0090] Example 1

[0091] The following reference Figure 1 An imaging lens according to Embodiment 1 of the present application is described. Figure 1 Schematic diagram of the structure of an imaging lens according to Embodiment 1 of the present application.

[0092] like Figure 1 As shown, the imaging lens 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 in order from the object side to the image side along the optical axis. The aperture 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.

[0093] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0094] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0095] The third lens L3 has positive refractive power, and its object-side surface S4 is convex and its image-side surface S5 is convex.

[0096] The fourth lens L4 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0097] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0098] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0099] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0100] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0101] The ninth lens L9 has positive refractive power, and its object-side surface S13 is convex, and its image-side surface S14 is convex.

[0102] The tenth lens L10 has negative refractive power, and its object-side surface S15 is convex, and its image-side surface S16 is concave.

[0103] The eleventh lens L11 has positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex.

[0104] The object-side surface S19 and the image-side surface S20 of the prism PG are flat surfaces.

[0105] 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 1 Not shown in FIG.

[0106] Table 1 shows the basic parameters of the imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0107] Table 1

[0108] 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 2.27%, and the main light angle of the imaging lens is 9.81°.

[0109] Figure 2 The distortion curve of the imaging lens of Example 1 is shown. Therefore, the imaging lens of Example 1 can achieve good imaging quality.

[0110] Example 2

[0111] The following reference Figure 3 An imaging lens according to Embodiment 2 of the present application is described. Figure 3 Schematic diagram of the structure of an imaging lens according to Embodiment 2 of the present application.

[0112] like Figure 3As shown, the imaging lens 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 in order from the object side to the image side along the optical axis. The aperture 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.

[0113] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0114] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0115] The third lens L3 has positive refractive power, and its object-side surface S4 is convex and its image-side surface S5 is convex.

[0116] The fourth lens L4 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0117] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0118] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0119] The seventh lens L7 has negative refractive power, and its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0120] The eighth lens L8 has positive refractive power, and its object-side surface S12 is convex, and its image-side surface S13 is convex.

[0121] The ninth lens L9 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0122] The tenth lens L10 has negative refractive power, and its object-side surface S15 is concave, and its image-side surface S16 is concave.

[0123] The eleventh lens L11 has positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex.

[0124] The object-side surface S19 and the image-side surface S20 of the prism PG are flat surfaces.

[0125] 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 3 Not shown in FIG.

[0126] Table 2 shows the basic parameters of the imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0127] Table 2

[0128] 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 2.01%, and the principal light angle of the imaging lens is 9.62°.

[0129] Figure 4 The distortion curve of the imaging lens of Example 2 is shown. Therefore, the imaging lens provided in Example 2 can achieve good imaging quality.

[0130] Example 3

[0131] The following reference Figure 5 An imaging lens according to Embodiment 3 of the present application is described. Figure 5 Schematic diagram of the structure of an imaging lens according to Embodiment 3 of the present application.

[0132] like Figure 5 As shown, the imaging lens 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 in order from the object side to the image side along the optical axis. The aperture 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.

[0133] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0134] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0135] The third lens L3 has positive refractive power, and its object-side surface S4 is convex and its image-side surface S5 is convex.

[0136] The fourth lens L4 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0137] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0138] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0139] The seventh lens L7 has negative refractive power, and its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0140] The eighth lens L8 has positive refractive power, and its object-side surface S12 is convex, and its image-side surface S13 is convex.

[0141] The ninth lens L9 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0142] The tenth lens L10 has negative refractive power, and its object-side surface S15 is concave, and its image-side surface S16 is concave.

[0143] The eleventh lens L11 has positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex.

[0144] The object-side surface S19 and the image-side surface S20 of the prism PG are flat surfaces.

[0145] 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 in FIG.

[0146] Table 3 shows the basic parameters of the imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0147]

[0148] Table 3

[0149] 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 main light angle of the imaging lens is 9.57°.

[0150] Figure 6 The distortion curve of the imaging lens of Example 3 is shown. Therefore, the imaging lens provided in Example 3 can achieve good imaging quality.

[0151] Example 4

[0152] The following reference Figure 7 An imaging lens according to Embodiment 4 of the present application is described. Figure 7 Schematic diagram of the structure of an imaging lens according to Embodiment 4 of the present application.

[0153] like Figure 7 As shown, the imaging lens 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 in order from the object side to the image side along the optical axis. The aperture 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.

[0154] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0155] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0156] The third lens L3 has positive refractive power, and its object-side surface S4 is convex and its image-side surface S5 is convex.

[0157] The fourth lens L4 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0158] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0159] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0160] The seventh lens L7 has negative refractive power, and its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0161] The eighth lens L8 has positive refractive power, and its object-side surface S12 is convex, and its image-side surface S13 is convex.

[0162] The ninth lens L9 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0163] The tenth lens L10 has negative refractive power, and its object-side surface S15 is concave, and its image-side surface S16 is concave.

[0164] The eleventh lens L11 has positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex.

[0165] The object-side surface S19 and the image-side surface S20 of the prism PG are flat surfaces.

[0166] 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 7 Not shown in FIG.

[0167] Table 4 shows the basic parameter table of the imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0168] Table 4

[0169] 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 2.00%, and the main light angle of the imaging lens is 9.7°.

[0170] Figure 8 The distortion curve of the imaging lens of Example 4 is shown. Therefore, the imaging lens provided in Example 4 can achieve good imaging quality.

[0171] Example 5

[0172] The following reference Fig. 9 An imaging lens according to Embodiment 5 of the present application is described. Fig. 9 Schematic diagram of the structure of an imaging lens according to Embodiment 5 of the present application.

[0173] like Fig. 9 As shown, the imaging lens 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 in order from the object side to the image side along the optical axis. The aperture 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.

[0174] The first lens L1 has positive refractive power, and its object-side surface S1 is convex, and its image-side surface S2 is convex.

[0175] The second lens L2 has negative refractive power, and its object-side surface S2 is concave, and its image-side surface S3 is concave.

[0176] The third lens L3 has positive refractive power, and its object-side surface S4 is convex and its image-side surface S5 is convex.

[0177] The fourth lens L4 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0178] The fifth lens L5 has negative refractive power, and its object-side surface S8 is concave and its image-side surface S9 is concave.

[0179] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0180] The seventh lens L7 has negative refractive power, and its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0181] The eighth lens L8 has positive refractive power, and its object-side surface S12 is convex, and its image-side surface S13 is convex.

[0182] The ninth lens L9 has positive refractive power, and its object-side surface S14 is convex, and its image-side surface S15 is convex.

[0183] The tenth lens L10 has negative refractive power, and its object-side surface S15 is concave, and its image-side surface S16 is concave.

[0184] The eleventh lens L11 has positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex.

[0185] The object-side surface S19 and the image-side surface S20 of the prism PG are flat surfaces.

[0186] The light from the object passes through the surfaces S1-S6, S8-S20 in sequence and is finally imaged on the imaging surface IMA. Fig. 9 Not shown in FIG.

[0187] Table 5 shows the basic parameter table of the imaging lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0188]

[0189] Table 5

[0190] 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 1.84%, and the main light angle of the imaging lens is 10.29°.

[0191] Fig.10Graph 1 shows the distortion curve of the imaging lens of Example 5. Therefore, the imaging lens of Example 5 can achieve good imaging quality.

[0192] In summary, the conditional expressions in Examples 1 to 5 satisfy the relationship shown in Table 6.

[0193] Conditional / Example 1 2 3 4 5 f / f1 1.86 1.83 1.82 1.83 1.90 f / f2 -1.01 -0.97 -0.97 -0.98 -1.01 f12 / f 0.97 0.98 0.99 0.99 0.95 f / f3 1.07 1.08 1.09 1.09 1.12 f / f4 -2.96 -2.89 -2.90 -2.90 -3.02 f / f5 -2.89 -2.44 -2.44 -2.44 -2.43 f / f6 1.63 1.31 1.31 1.31 1.29 f56 / f -1.12 -1.14 -1.15 -1.15 -1.09 |f / f7| 1.23 1.62 1.61 1.61 1.66 |f / f8| 1.71 2.32 2.31 2.31 2.39 f / f9 1.84 1.70 1.69 1.69 1.73 f / f10 -0.88 -2.19 -2.19 -2.18 -2.22 f / f11 1.49 1.49 1.49 1.49 1.51 fa / fb 15.17 13.93 14.40 14.53 14.96 f / (R42-R51) 1.33 1.32 1.31 1.31 1.31 BFL / f 0.75 0.75 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

[0194] Table 6

[0195] The present application also provides an imaging device, whose electronic photosensitive element may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and the imaging device is equipped with the imaging lens described above.

[0196] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

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 refractive power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive refractive power; a seventh lens having optical power; an eighth lens having optical power; a ninth lens having positive refractive power; a tenth lens having negative optical power; an eleventh lens having positive refractive power; The seventh lens and the eighth lens have opposite signs of optical power. The imaging lens has eleven lenses with optical power.

2. The imaging lens according to claim 1, characterized in that: 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 a convex surface, and the image side surface is a convex surface; The image side surface of the tenth lens is a concave surface; The object side surface of the eleventh lens is a convex surface, and the image side surface is a convex surface.

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

4. The imaging lens according to claim 1, wherein: The seventh lens and the eighth lens are cemented to form a cemented lens; the ninth lens and the tenth lens are cemented to form a cemented lens.

5. The imaging lens according to claim 1, wherein: The seventh lens, the eighth lens and the ninth lens are cemented together to form a cemented lens.

6. The imaging lens according to any one of claims 1 to 5, characterized in that: The total effective focal length f of the imaging lens and the effective focal length f1 of the first lens satisfy: 1.75≤f / f1≤2.

7. The imaging lens according to any one of claims 1 to 5, characterized in that: The total effective focal length f of the imaging lens and the effective focal length f2 of the second lens satisfy: -1.5≤f / f2≤-0.

9.

8. The imaging lens according to any one of claims 1 to 5, characterized in that: The combined focal length f12 of the first lens and the second lens and the total effective focal length f of the imaging lens satisfy the following: 0.9≤f12 / f≤1.

9. The imaging lens according to any one of claims 1 to 5, characterized in that: The total effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy: 1≤f / f3≤1.

5.

10. The imaging lens according to any one of claims 1 to 5, characterized in that: The total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: -3.2≤f / f4≤-2.8.

Images