Imaging lens

Abstract

The application discloses an imaging lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with negative or positive refractive power, a seventh lens with positive or negative refractive power, an eighth lens with negative or positive refractive power, a ninth lens with positive or negative refractive power, a tenth lens with negative or positive refractive power, and an eleventh lens with negative or positive refractive power; the adjacent two lenses among the sixth lens, the seventh lens and the eighth lens have opposite refractive power; the number of lenses with negative refractive power among the ninth lens, the tenth lens and the eleventh lens is two; the imaging lens satisfies the condition formula: 0.707≤FG1 / F≤1.856; wherein FG1 is the combined effective focal length of the first lens to the fifth lens, and F is the effective focal length of the imaging lens.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to an imaging lens. Background Technology

[0002] With the continuous advancement of optical technology, aiming lenses need to be used in various complex environmental conditions. Therefore, adaptability technologies for different environments are constantly developing, which places higher demands on aiming lenses. First, as handheld products, aiming lenses prioritize portability; their weight and size must be sufficiently small, thus requiring miniaturization. Second, to meet the need for discerning minute details, high image quality is required. Third, to meet the requirements of low-light conditions such as dusk and dawn, aiming lenses must be able to achieve infrared confocal functionality.

[0003] The following shortcomings still exist in the current market for observation and aiming lenses:

[0004] 1. Existing observation and aiming lenses cannot simultaneously achieve miniaturization and high image quality;

[0005] 2. Existing observation and aiming lenses cannot simultaneously achieve infrared confocal functionality and high image quality;

[0006] Therefore, designing a viewing lens with features such as miniaturization, high resolution, and infrared confocal focus has become a market trend. Summary of the Invention

[0007] This application provides an imaging lens, which, along the optical axis from the object side to the image side, sequentially includes: a first lens having positive optical power; a second lens having positive optical power; a third lens having negative optical power; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having either positive or negative optical power; a seventh lens having either positive or negative optical power; an eighth lens having either positive or negative optical power; a ninth lens having either positive or negative optical power; a tenth lens having either positive or negative optical power; and an eleventh lens having either positive or negative optical power; the imaging lens has an optical... The number of lenses with different focal lengths is eleven; adjacent lenses in the sixth, seventh, and eighth lenses have opposite optical powers; the number of lenses with negative optical powers in the ninth, tenth, and eleventh lenses is two; when the eighth lens has a negative optical power, the eleventh lens also has a negative optical power; when the eighth lens has a positive optical power, the ninth lens has a negative optical power; the imaging lens satisfies the condition: 0.707≤FG1 / F≤1.856; where FG1 is the combined effective focal length of the first to fifth lenses, and F is the effective focal length of the imaging lens.

[0008] According to an exemplary embodiment of this application, the optical power of the sixth, eighth, tenth, and eleventh lenses is negative, and the optical power of the seventh and ninth lenses is positive; or the optical power of the sixth, eighth, ninth, and eleventh lenses is negative, and the optical power of the seventh and tenth lenses is positive; or the optical power of the seventh, ninth, and tenth lenses is negative, and the optical power of the sixth, eighth, and eleventh lenses is positive; or the optical power of the seventh, ninth, and eleventh lenses is negative, and the optical power of the sixth, eighth, and tenth lenses is positive.

[0009] According to an exemplary embodiment of this application, the object-side surface of the first lens is convex, and the image-side surface is concave; the object-side surface of the second lens is convex, and the image-side surface is convex, concave, or planar; the object-side surface of the third lens is convex, concave, or planar, and the image-side surface is concave; the object-side surface of the fourth lens is convex, and the image-side surface is convex, concave, or planar; the object-side surface of the fifth lens is convex, concave, or planar, and the image-side surface is concave; and the object-side surface of the sixth lens is convex, and the image-side surface is convex or concave.

[0010] According to an exemplary embodiment of this application, the seventh lens is convex-convex, the eighth lens is concave-concave, the ninth lens is convex-convex, the tenth lens is concave-convex, concave-concave, or concave-flat, and the eleventh lens is concave-convex; or the seventh lens is convex-convex, the eighth lens is concave-concave, the ninth lens is convex-concave, the tenth lens is convex-convex, and the eleventh lens is concave-convex or concave-concave; or the seventh lens is convex-concave, the eighth lens is convex-concave, the ninth lens is convex-concave, the tenth lens is convex-convex, and the eleventh lens is concave-convex; or the seventh lens is convex-concave, the eighth lens is convex-convex, concave-convex, or flat-convex, the ninth lens is concave-convex, the tenth lens is concave-concave, and the eleventh lens is convex-convex; or the tenth lens is concave-convex, and the eleventh lens is concave-convex; or the seventh lens is concave-concave, the eighth lens is concave-convex, the ninth lens is concave-convex, the tenth lens is convex-convex, and the eleventh lens is concave-concave.

[0011] According to an exemplary embodiment of this application, the second lens, the third lens, the fourth lens and the fifth lens are cemented together to form a first cemented lens group, the sixth lens, the seventh lens and the eighth lens are cemented together to form a second cemented lens group, and at least two of the ninth lens, the tenth lens and the eleventh lens are cemented together to form a third cemented lens group; the first lens to the eighth lens are combined to form a first lens group; and the ninth lens to the eleventh lens are combined to form a second lens group.

[0012] According to an exemplary embodiment of this application, the second lens, the third lens, the fourth lens and the fifth lens are cemented together to form a first cemented lens group, the sixth lens and the seventh lens are cemented together to form a second cemented lens group, the eighth lens and the ninth lens are cemented together to form a third cemented lens group, and the tenth lens and the eleventh lens are cemented together to form a fourth cemented lens group; the first to the seventh lenses are combined to form a first lens group; and the eighth to the eleventh lenses are combined to form a second lens group.

[0013] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: -1.547≤FG2 / F≤-0.390, 0.982≤FA1 / F≤4.794, 0.370≤FA2 / F≤1.439, -0.167≤(RG21-RG22) / TG2≤0.829, 0.761≤T1 / T2≤1.251, 1.985≤FA1 / T1≤9.629, where FG2 is the combined effective focal length of the first cemented lens group and the second cemented lens group, and FA1 is the first lens group. The total effective focal length of the group, FA2 is the total effective focal length of the second lens group, RG21 is the radius of curvature of the object side of the first lens of the second cemented lens group, RG22 is the radius of curvature of the image side of the last lens of the second cemented lens group, TG2 is the center distance between the object side of the first lens of the second cemented lens group and the image side of the last lens of the second cemented lens group, T1 is the center distance between the object side of the first lens and the image side of the last lens of the second cemented lens group, and T2 is the center distance between the image side of the last lens of the second cemented lens group and the image plane of the imaging lens.

[0014] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.743≤F1 / F≤1.242, 0.446≤F2 / F≤1.037, -0.490≤F3 / F≤-0.303, 0.365≤F4 / F≤0.622, -1.310≤F5 / F≤-0.427, -0.938≤F6 / F F≤0.647, -0.537≤F7 / F≤0.462, -0.294≤F8 / F≤0.321, -0.935≤F9 / F≤0.251, -0.58 4≤F10 / F≤0.388, -1.255≤F11 / F≤0.627, -1.993≤(RG11-RG12) / TG1≤0.100, 0.849 ≤BFL / H≤1.570, where F1 is the effective focal length of the first lens, F2 is the effective focal length of 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, 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, RG11 is the radius of curvature of the object-side surface of the second lens, RG12 is the radius of curvature of the image-side surface of the fifth lens, TG1 is the center distance from the object-side surface of the second lens to the image-side surface of the fifth lens, BFL is the center distance from the image-side surface of the eleventh lens to the image plane of the imaging lens, and H is the total image height of the imaging lens.

[0015] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: -1.406≤FG2 / F≤-0.433, 1.091≤FA1 / F≤4.358, 0.411≤FA2 / F≤1.308, -0.152≤(RG21-RG22) / TG2≤0.754, 0.845≤T1 / T2≤1.137, 2.205≤FA1 / T1≤8.754, where FG2 is the combined effective focal length of the first cemented lens group and the second cemented lens group, and FA1 is the first lens group. The total effective focal length of the group, FA2 is the total effective focal length of the second lens group, RG21 is the radius of curvature of the object side of the first lens of the second cemented lens group, RG22 is the radius of curvature of the image side of the last lens of the second cemented lens group, TG2 is the center distance between the object side of the first lens of the second cemented lens group and the image side of the last lens of the second cemented lens group, T1 is the center distance between the object side of the first lens and the image side of the last lens of the second cemented lens group, and T2 is the center distance between the image side of the last lens of the second cemented lens group and the image plane of the imaging lens.

[0016] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.826≤F1 / F≤1.129, 0.495≤F2 / F≤0.943, -0.445≤F3 / F≤-0.337, 0.405≤F4 / F≤0.565, -1.191≤F5 / F≤-0.474, -0.853≤F6 / F≤0.5 88, -0.488≤F7 / F≤0.420, -0.267≤F8 / F≤0.292, -0.850≤F9 / F≤0.228, -0.531≤F10 / F ≤0.353, -1.141≤F11 / F≤0.570, 0.785≤FG1 / F≤1.687, -1.812≤(RG11-RG12) / TG1≤0. 091, 0.943≤BFL / H≤1.427, where F1 is the effective focal length of the first lens, F2 is the effective focal length of 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, 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, RG11 is the radius of curvature of the object side of the second lens, RG12 is the radius of curvature of the image side of the fifth lens, TG1 is the center distance from the object side of the second lens to the image side of the fifth lens, BFL is the center distance between the image side of the eleventh lens and the image plane of the imaging lens, and H is the total image height of the imaging lens.

[0017] The imaging lens of this application achieves at least one of the following beneficial effects by reasonably setting the number of lenses (e.g., eleven), reasonably allocating the optical power of each lens, optimizing the surface shape of each lens, and reasonably setting the range of parameters: miniaturization (TTL≤54.1mm), large aperture (maximum aperture FNO=1.8), large target surface (matching 1 / 1.8″ chip), long focal length (F=50mm), infrared confocal, and high resolution. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. In the drawings:

[0019] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown;

[0020] Figure 2 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown;

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

[0022] Figure 4 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown;

[0023] Figure 5 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown;

[0024] Figure 6 A schematic diagram of the imaging lens according to Embodiment 6 of this application is shown;

[0025] Figure 7 A schematic diagram of the imaging lens according to Embodiment 7 of this application is shown. Detailed Implementation

[0026] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0027] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0028] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0029] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprises," 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 terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. It should be noted that the longitudinal direction stated herein is perpendicular to the optical axis.

[0030] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] An imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side, 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.

[0033] In an exemplary embodiment, the first lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The positive optical power of the first lens allows it to collect light rays as close to the optical axis as possible, which helps reduce the effective aperture of the rear lens, thereby achieving lens miniaturization. The convex object-side surface and concave image-side surface effectively reduce various aberrations, except for spherical aberration and chromatic aberration, generated by light passing through the first lens, thus improving the resolving power of the imaging lens.

[0034] In an exemplary embodiment, the second lens may have positive optical power, and its object-side surface may be convex, while its image-side surface may be either convex or concave. The positive optical power and convex object-side surface of the second lens can appropriately compress light rays, effectively reducing coma and chromatic aberration generated by light passing through the second lens, thus improving the imaging quality of the imaging lens.

[0035] However, those skilled in the art should understand that, since the radius of curvature of the image side of the second lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, and usually have little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0036] In an exemplary embodiment, the third lens may have negative optical power, and its object-side surface may be convex or concave, while its image-side surface may be concave. The negative optical power and concave image-side surface of the third lens effectively reduce various aberrations, except for spherical aberration and on-axis chromatic aberration, generated by light passing through it, thus improving the resolving power of the imaging lens.

[0037] However, those skilled in the art should understand that, since the curvature radius of the object side of the third lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, which usually has little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large curvature radius as the optimization boundary condition for this surface does not require any creative effort.

[0038] In an exemplary embodiment, the fourth lens may have positive optical power, and its object-side surface may be convex, while its image-side surface may be either convex or concave. The fourth lens having positive optical power and a convex object-side surface effectively balances the spherical aberration and axial chromatic aberration generated by light passing through the first lens, while also effectively reducing other aberrations generated by light passing through the fourth lens, thus improving the imaging quality of the imaging lens.

[0039] However, those skilled in the art should understand that, since the radius of curvature of the image side of the fourth lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, and usually have little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0040] In an exemplary embodiment, the fifth lens may have negative optical power, and its object-side surface may be convex or concave, while its image-side surface may be concave. The fifth lens having negative optical power and a concave image-side surface effectively balances the spherical aberration and chromatic aberration generated by light passing through the first lens, thus improving the imaging quality of the imaging lens; simultaneously, it helps to reduce the effective aperture of the rear lens, thereby achieving lens miniaturization.

[0041] However, those skilled in the art should understand that, since the curvature radius of the object side of the fifth lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, which usually has little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large curvature radius as the optimization boundary condition for this surface does not require any creative effort.

[0042] In an exemplary embodiment, the sixth lens may have negative optical power, with its object-side surface being convex and its image-side surface being concave. The negative optical power, convex object-side surface, and concave image-side surface of the sixth lens effectively reduce field curvature and chromatic aberration caused by light passing through it, thus improving the imaging quality of the imaging lens.

[0043] In an exemplary embodiment, the sixth lens may have positive optical power, and its object-side surface may be convex, while its image-side surface may be either convex or concave. The sixth lens having positive optical power and a convex object-side surface allows for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens.

[0044] In an exemplary embodiment, the seventh lens may have positive optical power, and its object-side surface may be convex, while its image-side surface may be either convex or concave. The seventh lens having positive optical power and a convex object-side surface effectively balances the spherical aberration and chromatic aberration generated by light passing through the first lens, thus improving the imaging quality of the imaging lens.

[0045] In an exemplary embodiment, the seventh lens may have negative optical power, and its object-side surface may be convex or concave, while its image-side surface may be concave. The negative optical power and concave image-side surface of the seventh lens allow for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens.

[0046] In an exemplary embodiment, the eighth lens may have negative optical power, and its object-side surface may be convex or concave, while its image-side surface may be concave. The eighth lens's negative optical power and concave image-side surface effectively balance the spherical aberration and chromatic aberration generated by light passing through the first lens, thus improving the imaging quality of the imaging lens.

[0047] In an exemplary embodiment, the eighth lens may have positive optical power, and its object-side surface may be convex or concave, while its image-side surface may be convex. The eighth lens having positive optical power and a convex image-side surface effectively reduces coma and chromatic aberration generated by light passing through it, while also effectively balancing spherical aberration generated by light passing through the preceding optical system, thus improving the imaging quality of the imaging lens.

[0048] However, those skilled in the art should understand that, since the curvature radius of the object side of the eighth lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, and usually have little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large curvature radius as the optimization boundary condition for this surface does not require any creative effort.

[0049] In an exemplary embodiment, the ninth lens may have positive optical power, and its object-side surface may be convex, as may its image-side surface. The fact that the ninth lens has positive optical power, and that both its object-side and image-side surfaces are convex, allows for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens.

[0050] In an exemplary embodiment, the ninth lens may have negative optical power, and its object-side surface may be convex or concave, and its image-side surface may be convex or concave. The convex object-side surface and concave image-side surface of the ninth lens allow for a smooth transition of light within the optical system, which helps reduce the tolerance sensitivity of the imaging lens; the concave object-side surface and convex image-side surface effectively elevate the light rays, which is beneficial for achieving a large target area effect in the imaging lens.

[0051] In an exemplary embodiment, the ninth lens may have negative optical power, and its object-side surface may be convex, while its image-side surface may be concave. The convex object-side surface and concave image-side surface of the ninth lens allow for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens.

[0052] In an exemplary embodiment, the ninth lens may have negative optical power, and its object-side surface may be concave, while its image-side surface may be convex. The concave object-side surface and convex image-side surface of the ninth lens effectively elevate the light rays, which is beneficial for achieving a large target area effect in the imaging lens.

[0053] In an exemplary embodiment, the tenth lens may have negative optical power, and its object-side surface may be concave, while its image-side surface may be convex or concave. The tenth lens's negative optical power and concave object-side surface allow for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens. Furthermore, when paired with an eleventh lens having the opposite optical power, it effectively reduces various aberrations caused by light passing through the tenth lens, thereby improving the imaging quality of the imaging lens.

[0054] However, those skilled in the art should understand that, since the radius of curvature of the image side of the tenth lens is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, and usually have little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0055] In an exemplary embodiment, the tenth lens may have positive optical power, and its object-side surface may be convex, as may its image-side surface. The tenth lens having positive optical power, and both its object-side and image-side surfaces being convex, allows for a smooth transition of light across the optical system, which helps reduce the tolerance sensitivity of the imaging lens.

[0056] In an exemplary embodiment, the eleventh lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be convex or concave. The eleventh lens having negative optical power and a concave object-side surface can effectively balance the spherical aberration generated by light passing through the preceding optical system, which is beneficial for improving the imaging quality of the optical lens; at the same time, it can effectively elevate the light rays, which is beneficial for achieving a large target area effect in the imaging lens.

[0057] In an exemplary embodiment, the eleventh lens may have positive optical power, and its object-side surface may be convex or concave, while its image-side surface may be convex. The eleventh lens, having positive optical power and a convex image-side surface, combined with the tenth lens having the opposite optical power, can effectively reduce various aberrations generated by light passing through the eleventh lens, thus improving the imaging quality of the imaging lens.

[0058] In an exemplary embodiment, the second lens, the third lens, the fourth lens, and the fifth lens are cemented together to form a first cemented lens group, which can effectively reduce the chromatic aberration of the imaging lens and help the imaging lens achieve the effect of infrared confocal focus.

[0059] In an exemplary embodiment, the sixth lens and the seventh lens are cemented together to form a second cemented lens group, or the sixth lens, the seventh lens and the eighth lens are cemented together to form a second cemented lens group, which can effectively correct the astigmatism caused by the front optical system of the imaging lens and help improve the lens resolution.

[0060] In an exemplary embodiment, the eighth lens and the ninth lens are cemented together to form a third cemented lens group, or the ninth lens and the tenth lens are cemented together to form a third cemented lens group, or the ninth lens, the tenth lens and the eleventh lens are cemented together to form a third cemented lens group, so that the light transitions smoothly between the optical systems, which helps to reduce the tolerance sensitivity of the imaging lens.

[0061] In an exemplary embodiment, the tenth lens and the eleventh lens are cemented together to form a fourth cemented lens group, which allows light to transition smoothly to the image plane of the imaging lens, thus helping to reduce the tolerance sensitivity of the imaging lens.

[0062] In an exemplary embodiment, the first to eighth lenses are combined to form a first lens group, or the first to seventh lenses are combined to form a first lens group. This can effectively reduce chromatic aberration in the imaging lens, which is beneficial for the imaging lens to achieve infrared confocal effect. At the same time, it can effectively correct astigmatism caused by the front optical system in the imaging lens, which is beneficial for improving the lens's resolving power.

[0063] In an exemplary embodiment, the eighth to eleventh lenses are combined to form a second lens group, or the ninth to eleventh lenses are combined to form a second lens group, so that the light transitions smoothly to the image plane of the imaging lens, which helps to reduce the tolerance sensitivity of the imaging lens.

[0064] In an exemplary embodiment, the total optical length (TTL) of the imaging lens can satisfy: TTL≤54.1mm, and further, TTL can satisfy: 53.9mm≤TTL≤54.1mm, thereby achieving the miniaturization requirement of the imaging lens.

[0065] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.743 ≤ F1 / F ≤ 1.242, where F1 is the effective focal length of the first lens and F is the effective focal length of the imaging lens. By making the imaging lens satisfy the above condition, the light rays are brought as close to the optical axis as possible, which helps to reduce the effective aperture of the rear lens, thereby achieving lens miniaturization and also helping to meet the requirements of a large aperture. Preferably, the imaging lens can further satisfy the condition: 0.826 ≤ F1 / F ≤ 1.129, which is even more conducive to achieving lens miniaturization and meeting the requirements of a large aperture.

[0066] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.446 ≤ F2 / F ≤ 1.037, where F2 is the effective focal length of the second lens and F is the effective focal length of the imaging lens. By satisfying the above condition, coma and chromatic aberration caused by light passing through the second lens can be effectively reduced, which is beneficial to improving the imaging quality of the imaging lens. Preferably, the imaging lens can further satisfy the condition: 0.495 ≤ F2 / F ≤ 0.943, which is even more beneficial to improving the imaging quality of the imaging lens.

[0067] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.490 ≤ F3 / F ≤ -0.303, where F3 is the effective focal length of the third lens and F is the effective focal length of the imaging lens. By satisfying the above condition, various aberrations, except for spherical aberration and on-axis chromatic aberration, generated by light passing through the third lens can be effectively reduced, which is beneficial to improving the resolving power of the imaging lens. Preferably, the imaging lens can further satisfy the condition: -0.445 ≤ F3 / F ≤ -0.337, which is even more beneficial to improving the resolving power of the imaging lens.

[0068] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.365 ≤ F4 / F ≤ 0.622, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the spherical aberration and axial chromatic aberration generated by light passing through the first lens can be effectively balanced, while other aberrations generated by light passing through the fourth lens can be effectively reduced, which is beneficial to improving the imaging quality of the imaging lens. Preferably, the imaging lens can further satisfy the condition: 0.405 ≤ F4 / F ≤ 0.565, which is even more beneficial to improving the imaging quality of the imaging lens.

[0069] In an exemplary embodiment, the imaging lens can satisfy the condition: -1.310 ≤ F5 / F ≤ -0.427, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the spherical aberration and axial chromatic aberration generated by light passing through the first lens can be effectively balanced, which is beneficial to improving the imaging quality of the imaging lens; at the same time, it is beneficial to reduce the effective aperture of the rear lens, thereby realizing the lens miniaturization function. Preferably, the imaging lens can further satisfy the condition: -1.191 ≤ F5 / F ≤ -0.474, which is even more beneficial to improving the imaging quality of the imaging lens and realizing the lens miniaturization function.

[0070] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.938 ≤ F6 / F ≤ 0.647, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the field curvature and chromatic aberration caused by light passing through the sixth lens can be effectively reduced, which is beneficial to improving the imaging quality of the imaging lens; at the same time, the light transitions smoothly between optical systems, which is beneficial to reducing the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy the condition: -0.853 ≤ F6 / F ≤ 0.588, which is even more beneficial to improving the imaging quality of the imaging lens and reducing the tolerance sensitivity of the imaging lens.

[0071] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.537 ≤ F7 / F ≤ 0.462, where F7 is the effective focal length of the seventh lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the spherical aberration and axial chromatic aberration generated by light passing through the first lens can be effectively balanced, which is beneficial to improving the imaging quality of the imaging lens; at the same time, it allows light to transition smoothly between optical systems, which is beneficial to reducing the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy the condition: -0.488 ≤ F7 / F ≤ 0.420, which is even more beneficial to improving the imaging quality of the imaging lens and reducing the tolerance sensitivity of the imaging lens.

[0072] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.294 ≤ F8 / F ≤ 0.321, where F8 is the effective focal length of the eighth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the spherical aberration and axial chromatic aberration generated by light passing through the first lens can be effectively balanced, while the coma and axial chromatic aberration generated by light passing through the eighth lens can be effectively reduced, which is beneficial to improving the imaging quality of the imaging lens. Preferably, the imaging lens can further satisfy the condition: -0.267 ≤ F8 / F ≤ 0.292, which is even more beneficial to improving the imaging quality of the imaging lens.

[0073] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.935 ≤ F9 / F ≤ 0.251, where F9 is the effective focal length of the ninth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the light transitions smoothly between optical systems, which helps reduce the tolerance sensitivity of the imaging lens; furthermore, it can effectively elevate the light, which is beneficial for achieving a large target area effect in the imaging lens. Preferably, the imaging lens can further satisfy the condition: -0.850 ≤ F9 / F ≤ 0.228, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens and achieving a large target area effect in the imaging lens.

[0074] In an exemplary embodiment, the imaging lens can satisfy: -0.584 ≤ F10 / F ≤ 0.388, where F10 is the effective focal length of the tenth lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the light transitions smoothly between optical systems, which helps reduce the tolerance sensitivity of the imaging lens; at the same time, it effectively reduces various aberrations generated by the light passing through the tenth lens, which helps improve the imaging quality of the imaging lens. Preferably, the imaging lens can further satisfy: -0.531 ≤ F10 / F ≤ 0.353, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens and improving the imaging quality of the imaging lens.

[0075] In an exemplary embodiment, the imaging lens can satisfy the condition: -1.255 ≤ F11 / F ≤ 0.627, where F11 is the effective focal length of the eleventh lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the spherical aberration generated by light passing through the preceding optical system can be effectively balanced, which is beneficial to improving the imaging quality of the optical lens; at the same time, it can effectively elevate the light rays, which is beneficial to achieving a large target area effect of the imaging lens. Preferably, the imaging lens can further satisfy the condition: -1.141 ≤ F11 / F ≤ 0.570, which is even more beneficial to improving the imaging quality of the optical lens and achieving a large target area effect of the imaging lens.

[0076] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.707 ≤ FG1 / F ≤ 1.856, where FG1 is the combined effective focal length of the first to fifth lenses, and F is the effective focal length of the imaging lens. By satisfying the above condition, the chromatic aberration of the imaging lens can be effectively reduced, which is beneficial for the imaging lens to achieve infrared confocal effect. Preferably, the imaging lens can further satisfy the condition: 0.785 ≤ FG1 / F ≤ 1.687, which is even more beneficial for the imaging lens to achieve infrared confocal effect.

[0077] In an exemplary embodiment, the imaging lens can satisfy the condition: -1.547 ≤ FG2 / F ≤ -0.390, where FG2 is the combined effective focal length of the first cemented lens group and the second cemented lens group, and F is the effective focal length of the imaging lens. By satisfying the above condition, the chromatic aberration of the imaging lens can be effectively reduced, which is beneficial for achieving infrared confocality; at the same time, it can effectively correct the astigmatism caused by the front optical system, which is beneficial for improving the lens's resolving power. Preferably, the imaging lens can further satisfy the condition: -1.406 ≤ FG2 / F ≤ -0.433, which is even more beneficial for achieving infrared confocality and improving the lens's resolving power.

[0078] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.982 ≤ FA1 / F ≤ 4.794, where FA1 is the total effective focal length of the first lens group and F is the effective focal length of the imaging lens. By satisfying the above condition, the chromatic aberration of the imaging lens can be effectively reduced, which is beneficial for the imaging lens to achieve infrared confocal effect; at the same time, when paired with the second lens group, it can effectively balance various aberrations generated by the imaging lens, which is beneficial for improving the lens resolution. Preferably, the imaging lens can further satisfy the condition: 1.091 ≤ FA1 / F ≤ 4.358, which is more conducive to the imaging lens achieving infrared confocal effect and improving the lens resolution.

[0079] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.370 ≤ FA2 / F ≤ 1.439, where FA2 is the total effective focal length of the second lens group and F is the effective focal length of the imaging lens. By satisfying the above condition, the light transitions smoothly between optical systems, which helps reduce the tolerance sensitivity of the imaging lens; furthermore, it can effectively elevate the light, which is beneficial for achieving a large target area effect in the imaging lens. Preferably, the imaging lens can further satisfy the condition: 0.411 ≤ FA2 / F ≤ 1.308, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens and achieving a large target area effect in the imaging lens.

[0080] In an exemplary embodiment, the imaging lens can satisfy: -1.993≤(RG11-RG12) / TG1≤0.100, where RG11 is the radius of curvature of the object-side surface of the second lens, RG12 is the radius of curvature of the image-side surface of the fifth lens, and TG1 is the center distance from the object-side surface of the second lens to the image-side surface of the fifth lens. By satisfying the above condition, the light transitions smoothly between optical systems, which helps to reduce the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy: -1.812≤(RG11-RG12) / TG1≤0.091, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0081] In an exemplary embodiment, the imaging lens can satisfy: -0.167≤(RG21-RG22) / TG2≤0.829, where RG21 is the radius of curvature of the object-side surface of the first lens in the second cemented lens group, RG22 is the radius of curvature of the image-side surface of the last lens in the second cemented lens group, and TG2 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens in the second cemented lens group. By satisfying the above condition, the light transitions smoothly between optical systems, which helps to reduce the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy: -0.152≤(RG21-RG22) / TG2≤0.754, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0082] In an exemplary embodiment, the imaging lens can satisfy: 0.761 ≤ T1 / T2 ≤ 1.251, where T1 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens in the second cemented lens group, and T2 is the center distance between the image-side surface of the last lens in the second cemented lens group and the image plane of the imaging lens. By satisfying the above condition, the light transitions smoothly between optical systems, which helps reduce the tolerance sensitivity of the imaging lens; it also helps the lens achieve a telephoto effect. Preferably, the imaging lens can further satisfy: 0.845 ≤ T1 / T2 ≤ 1.137, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens and achieving a telephoto effect.

[0083] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.849 ≤ BFL / H ≤ 1.570, where BFL is the center distance between the image side of the eleventh lens and the image plane of the imaging lens, and H is the full image height of the imaging lens. By satisfying the above condition, the imaging lens can simultaneously meet the requirements of a large target area and a long back focal length. Preferably, the imaging lens can further satisfy the condition: 0.943 ≤ BFL / H ≤ 1.427, which is even more conducive to simultaneously meeting the requirements of a large target area and a long back focal length.

[0084] In an exemplary embodiment, the imaging lens can satisfy: 1.985≤FA1 / T1≤9.629, where FA1 is the total effective focal length of the first lens group, and T1 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens in the second cemented lens group. By satisfying the above condition, the chromatic aberration of the imaging lens can be effectively reduced, which is beneficial for achieving infrared confocal effect; at the same time, it allows for a smooth transition of light between optical systems, which is beneficial for reducing the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy: 2.205≤FA1 / T1≤8.754, which is even more beneficial for achieving infrared confocal effect and reducing the tolerance sensitivity of the imaging lens.

[0085] The imaging lens according to the above embodiments of this application employs eleven lenses. By rationally allocating the optical parameters such as the optical power and surface shape of each lens, at least one beneficial effect can be achieved, such as miniaturization (TTL≤54.1mm), large aperture (maximum aperture FNO=1.8), large target surface (matching 1 / 1.8″ chip), long focal length (F=50mm), infrared confocal, and high resolution.

[0086] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the imaging lens can be changed to obtain the various results and advantages described in this specification.

[0087] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the imaging lens applicable to the above-described embodiments.

[0088] Example 1

[0089] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown.

[0090] like Figure 1 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0091] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0092] The second lens L2 has positive optical power, with its object side S3 being convex and its image side S4 being concave.

[0093] The third lens L3 has negative optical power, with its object side S4 being convex and its image side S5 being concave.

[0094] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0095] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0096] The sixth lens L6 has negative optical power, with its object side S8 being convex and its image side S9 being concave.

[0097] The seventh lens L7 has positive optical power, and its object side S9 is convex, and its image side S10 is convex.

[0098] The eighth lens L8 has negative optical power, and its object side S10 is concave, and its image side S11 is concave.

[0099] The ninth lens L9 has positive optical power, and its object side S12 is convex, and its image side S13 is convex.

[0100] The tenth lens L10 has negative optical power, with its object side S13 being concave and its image side S14 being convex.

[0101] The eleventh lens L11 has negative optical power, with its object side S15 being concave and its image side S16 being convex.

[0102] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6, the seventh lens L7 and the eighth lens L8 are cemented together to form the second cemented lens group; the ninth lens L9 and the tenth lens L10 are cemented together to form the third cemented lens group.

[0103] The first lens L1 to the eighth lens L8 are combined to form the first lens group A1, and the ninth lens L9 to the eleventh lens L11 are combined to form the second lens group A2.

[0104] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0105] The imaging lens also includes a protective glass / filter CG disposed between the eleventh lens L11 and the image plane IMA, which has an object side S17 and an image side S18.

[0106] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 1 Not shown in the image.

[0107] Table 1 shows the basic parameters of the imaging lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0108] Table 1

[0109] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 34.139 3.814 2.001 25.47 S2 spherical 122.726 0.901 STO spherical Infinity 0.100 S3 spherical 22.967 5.173 1.593 68.34 S4 spherical 3078.245 0.800 1.654 39.54 S5 spherical 14.216 5.466 1.593 68.34 S6 spherical -15828.834 0.800 1.728 28.32 S7 spherical 24.573 2.495 S8 spherical 15.512 0.800 1.954 32.31 S9 spherical 9.123 4.549 1.593 68.34 S10 spherical -72.630 0.800 2.001 25.43 S11 spherical 14.329 8.620 S12 spherical 33.432 4.349 2.001 29.15 S13 spherical -16.386 0.800 1.618 63.39 S14 spherical -2814.416 2.433 S15 spherical -22.683 3.500 1.618 63.39 S16 spherical -66.898 0.100 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0110] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 54mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the center field of view at a spatial frequency of 250lp / mm is 0.66, and the MTF value of the peripheral field of view is 0.44.

[0111] Example 2

[0112] Figure 2 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown.

[0113] like Figure 2 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0114] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0115] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0116] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0117] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0118] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0119] The sixth lens L6 has negative optical power, with its object side S8 being convex and its image side S9 being concave.

[0120] The seventh lens L7 has positive optical power, and its object side S9 is convex, and its image side S10 is convex.

[0121] The eighth lens L8 has negative optical power, and its object side S10 is concave, and its image side S11 is concave.

[0122] The ninth lens L9 has negative optical power, with its object side S12 being convex and its image side S13 being concave.

[0123] The tenth lens L10 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0124] The eleventh lens L11 has negative optical power, with its object side S15 being concave and its image side S16 being convex.

[0125] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6, the seventh lens L7 and the eighth lens L8 are cemented together to form the second cemented lens group; the ninth lens L9 and the tenth lens L10 are cemented together to form the third cemented lens group.

[0126] The first lens L1 to the eighth lens L8 are combined to form the first lens group A1, and the ninth lens L9 to the eleventh lens L11 are combined to form the second lens group A2.

[0127] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0128] The imaging lens also includes a protective glass / filter CG disposed between the eleventh lens L11 and the image plane IMA, which has an object side S17 and an image side S18.

[0129] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 2 Not shown in the image.

[0130] Table 2 shows the basic parameters of the imaging lens in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0131] Table 2

[0132] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 31.798 3.942 1.808 22.70 S2 spherical 106.514 1.015 STO spherical Infinity 0.100 S3 spherical 22.500 6.100 1.744 44.90 S4 spherical -92.139 0.800 1.654 39.54 S5 spherical 13.210 5.867 1.438 94.52 S6 spherical -81.186 0.800 1.855 24.80 S7 spherical 43.729 0.100 S8 spherical 18.058 0.800 1.847 23.78 S9 spherical 11.829 4.568 1.438 94.52 S10 spherical -36.964 0.800 1.923 20.88 S11 spherical 18.993 7.955 S12 spherical 203.380 0.800 1.487 70.44 S13 spherical 18.839 2.785 2.001 25.43 S14 spherical -50.819 8.169 S15 spherical -14.921 0.800 1.593 68.34 S16 spherical -28.208 0.100 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0133] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 54.001mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the center field of view at a spatial frequency of 250lp / mm is 0.62, and the MTF value of the peripheral field of view is 0.37.

[0134] Example 3

[0135] Figure 3 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown.

[0136] like Figure 3 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0137] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0138] The second lens L2 has positive optical power, with its object side S3 being convex and its image side S4 being concave.

[0139] The third lens L3 has negative optical power, with its object side S4 being convex and its image side S5 being concave.

[0140] The fourth lens L4 has positive optical power, with its object side S5 being convex and its image side S6 being concave.

[0141] The fifth lens L5 has negative optical power, its object side S6 is convex, and its image side S7 is concave.

[0142] The sixth lens L6 has negative optical power, with its object side S8 being convex and its image side S9 being concave.

[0143] The seventh lens L7 has positive optical power, and its object side S9 is convex, and its image side S10 is convex.

[0144] The eighth lens L8 has negative optical power, and its object side S10 is concave, and its image side S11 is concave.

[0145] The ninth lens L9 has negative optical power, with its object side S12 being convex and its image side S13 being concave.

[0146] The tenth lens L10 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0147] The eleventh lens L11 has negative optical power, and its object side S15 is concave, as is its image side S16.

[0148] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6, the seventh lens L7 and the eighth lens L8 are cemented together to form the second cemented lens group; the ninth lens L9 and the tenth lens L10 are cemented together to form the third cemented lens group.

[0149] The first lens L1 to the eighth lens L8 are combined to form the first lens group A1, and the ninth lens L9 to the eleventh lens L11 are combined to form the second lens group A2.

[0150] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0151] The imaging lens also includes a protective glass / filter CG disposed between the eleventh lens L11 and the image plane IMA, which has an object side S17 and an image side S18.

[0152] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 3 Not shown in the image.

[0153] Table 3 shows the basic parameters of the imaging lens of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0154] Table 3

[0155] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 35.791 3.723 2.001 25.47 S2 spherical 133.130 0.843 STO spherical Infinity 0.100 S3 spherical 21.626 6.049 1.593 68.34 S4 spherical 824.507 0.800 1.654 39.54 S5 spherical 13.193 5.288 1.497 81.61 S6 spherical 182.828 1.322 1.808 22.70 S7 spherical 31.038 2.618 S8 spherical 14.130 0.800 1.770 29.81 S9 spherical 8.862 5.541 1.438 94.52 S10 spherical -173.606 0.800 1.741 27.76 S11 spherical 10.485 8.916 S12 spherical 25.875 2.867 1.923 20.88 S13 spherical 7.446 3.825 1.921 23.96 S14 spherical -17.240 0.275 S15 spherical -17.595 0.800 1.593 68.34 S16 spherical 48.592 0.933 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0156] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 54mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the central field of view at a spatial frequency of 250lp / mm is 0.64, and the MTF value of the peripheral field of view is 0.35.

[0157] Example 4

[0158] Figure 4 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown.

[0159] like Figure 4 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0160] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0161] The second lens L2 has positive optical power, with its object side S3 being convex and its image side S4 being concave.

[0162] The third lens L3 has negative optical power, with its object side S4 being convex and its image side S5 being concave.

[0163] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0164] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0165] The sixth lens L6 has negative optical power, with its object side S8 being convex and its image side S9 being concave.

[0166] The seventh lens L7 has positive optical power, with its object side S9 being convex and its image side S10 being concave.

[0167] The eighth lens L8 has negative optical power, with its object side S10 being convex and its image side S11 being concave.

[0168] The ninth lens L9 has negative optical power, with its object side S12 being convex and its image side S13 being concave.

[0169] The tenth lens L10 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0170] The eleventh lens L11 has negative optical power, with its object-side surface S14 being concave and its image-side surface S15 being convex.

[0171] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6, the seventh lens L7 and the eighth lens L8 are cemented together to form the second cemented lens group; the ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form the third cemented lens group.

[0172] The first lens L1 to the eighth lens L8 are combined to form the first lens group A1, and the ninth lens L9 to the eleventh lens L11 are combined to form the second lens group A2.

[0173] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0174] The imaging lens also includes a protective glass / filter CG disposed between the eleventh lens L11 and the image plane IMA, which has an object side S16 and an image side S17.

[0175] Light from the object passes sequentially through surfaces S1 to S17 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S17... Figure 4 Not shown in the image.

[0176] Table 4 shows the basic parameters of the imaging lens in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0177] Table 4

[0178] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 35.494 3.575 2.001 25.47 S2 spherical 106.420 1.019 STO spherical Infinity 0.100 S3 spherical 22.407 4.900 1.593 68.34 S4 spherical 146.837 0.800 1.654 39.54 S5 spherical 13.053 6.105 1.497 81.61 S6 spherical -3990.512 3.000 1.808 22.70 S7 spherical 49.230 1.714 S8 spherical 15.695 0.800 1.603 38.01 S9 spherical 8.096 5.914 1.497 81.61 S10 spherical 467.314 0.800 2.003 28.32 S11 spherical 10.033 6.037 S12 spherical 35.961 1.392 2.001 25.47 S13 spherical 6.771 4.031 2.003 28.32 S14 spherical -9.764 0.800 1.804 46.57 S15 spherical -672.837 4.512 S16 spherical Infinity 1.200 1.517 64.20 S17 spherical Infinity 7.300 IMA spherical Infinity - - -

[0179] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 53.999mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the center field of view at a spatial frequency of 250lp / mm is 0.65, and the MTF value of the peripheral field of view is 0.38.

[0180] Example 5

[0181] Figure 5 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown.

[0182] like Figure 5 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0183] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0184] The second lens L2 has positive optical power, with its object side S3 being convex and its image side S4 being concave.

[0185] The third lens L3 has negative optical power, with its object side S4 being convex and its image side S5 being concave.

[0186] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0187] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0188] The sixth lens L6 has positive optical power, with its object side S8 being convex and its image side S9 being concave.

[0189] The seventh lens L7 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0190] The eighth lens L8 has positive optical power, and its object side S11 is convex, and its image side S12 is convex.

[0191] The ninth lens L9 has negative optical power, with its object side S12 being concave and its image side S13 being convex.

[0192] The tenth lens L10 has negative optical power, and its object side S14 is concave, as is its image side S15.

[0193] The eleventh lens L11 has positive optical power, and its object-side surface S15 is convex, while its image-side surface S16 is convex.

[0194] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6 and the seventh lens L7 are cemented together to form the second cemented lens group; the eighth lens L8 and the ninth lens L9 are cemented together to form the third cemented lens group; the tenth lens L10 and the eleventh lens L11 are cemented together to form the fourth lens group.

[0195] The first lens L1 to the seventh lens L7 are combined to form the first lens group A1, and the eighth lens L8 to the eleventh lens L11 are combined to form the second lens group A2.

[0196] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0197] The imaging lens also includes a protective glass / filter CG disposed between the eleventh lens L11 and the image plane IMA, which has an object side S17 and an image side S18.

[0198] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 5 Not shown in the image.

[0199] Table 5 shows the basic parameters of the imaging lens of Example 5, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0200] Table 5

[0201] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 50.459 3.738 2.001 25.47 S2 spherical 423.654 0.519 STO spherical Infinity 3.000 S3 spherical 25.177 4.306 1.593 68.34 S4 spherical 229.629 0.900 1.654 39.54 S5 spherical 13.732 6.160 1.593 68.34 S6 spherical -81.898 0.800 1.805 25.46 S7 spherical 25.748 0.300 S8 spherical 11.745 5.372 1.593 68.34 S9 spherical 53.897 0.800 1.603 38.01 S10 spherical 8.780 9.209 S11 spherical 127.464 2.794 1.847 23.78 S12 spherical -8.788 0.800 1.883 39.22 S13 spherical -46.244 3.350 S14 spherical -21.789 0.800 1.808 22.70 S15 spherical 26.951 2.051 1.904 31.32 S16 spherical -29.738 0.600 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0202] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 53.999mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the central field of view at a spatial frequency of 250lp / mm is 0.65, and the MTF value of the peripheral field of view is 0.27.

[0203] Example 6

[0204] Figure 6 A schematic diagram of the imaging lens according to Embodiment 6 of this application is shown.

[0205] like Figure 6 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0206] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0207] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0208] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0209] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0210] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0211] The sixth lens L6 has positive optical power, with its object side S8 being convex and its image side S9 being concave.

[0212] The seventh lens L7 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0213] The eighth lens L8 has positive optical power, and its object side S11 is convex, and its image side S12 is convex.

[0214] The ninth lens L9 has negative optical power, with its object side S12 being concave and its image side S13 being convex.

[0215] The tenth lens L10 has negative optical power, with its object side S14 being concave and its image side S15 being convex.

[0216] The eleventh lens L11 has positive optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex.

[0217] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6 and the seventh lens L7 are cemented together to form the second cemented lens group; the eighth lens L8 and the ninth lens L9 are cemented together to form the third cemented lens group; the tenth lens L10 and the eleventh lens L11 are cemented together to form the fourth lens group.

[0218] The first lens L1 to the seventh lens L7 are combined to form the first lens group A1, and the eighth lens L8 to the eleventh lens L11 are combined to form the second lens group A2.

[0219] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0220] The imaging lens also includes a protective glass / filter CG disposed between the ninth lens L9 and the image plane IMA, which has an object side surface S17 and an image side surface S18.

[0221] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 6 Not shown in the image.

[0222] Table 6 shows the basic parameters of the imaging lens of Example 6, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0223] Table 6

[0224] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 45.649 3.909 2.001 25.47 S2 spherical 310.311 0.597 STO spherical Infinity 3.000 S3 spherical 26.950 4.712 1.593 68.34 S4 spherical -196.421 0.900 1.654 39.54 S5 spherical 14.467 5.666 1.593 68.34 S6 spherical -76.749 0.800 1.805 25.46 S7 spherical 25.854 0.300 S8 spherical 12.342 4.228 1.593 68.34 S9 spherical 36.608 0.800 1.648 33.89 S10 spherical 11.000 10.790 S11 spherical 60.318 2.989 1.755 27.53 S12 spherical -8.712 0.800 1.744 44.90 S13 spherical -57.395 2.838 S14 spherical -11.981 0.800 1.728 28.32 S15 spherical -62.590 1.771 1.904 31.32 S16 spherical -18.582 0.598 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0225] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 53.998mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the central field of view at a spatial frequency of 250lp / mm is 0.63, and the MTF value of the peripheral field of view is 0.26.

[0226] Example 7

[0227] Figure 7 A schematic diagram of the imaging lens according to Embodiment 7 of this application is shown.

[0228] like Figure 7 As shown, the imaging lens includes, in sequence 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, and an eleventh lens L11.

[0229] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0230] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0231] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0232] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0233] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0234] The sixth lens L6 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.

[0235] The seventh lens L7 has negative optical power, and its object side S9 is concave, and its image side S10 is concave.

[0236] The eighth lens L8 has positive optical power, with its object side S11 being concave and its image side S12 being convex.

[0237] The ninth lens L9 has negative optical power, with its object side S12 being concave and its image side S13 being convex.

[0238] The tenth lens L10 has positive optical power, and its object side S14 is convex, and its image side S15 is convex.

[0239] The eleventh lens L11 has negative optical power, and its object side S15 is concave, as is its image side S16.

[0240] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group; the sixth lens L6 and the seventh lens L7 are cemented together to form the second cemented lens group; the eighth lens L8 and the ninth lens L9 are cemented together to form the third cemented lens group; the tenth lens L10 and the eleventh lens L11 are cemented together to form the fourth lens group.

[0241] The first lens L1 to the seventh lens L7 are combined to form the first lens group A1, and the eighth lens L8 to the eleventh lens L11 are combined to form the second lens group A2.

[0242] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0243] The imaging lens also includes a protective glass / filter CG disposed between the ninth lens L9 and the image plane IMA, which has an object side surface S17 and an image side surface S18.

[0244] Light from the object passes sequentially through surfaces S1 to S18 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S18... Figure 7 Not shown in the image.

[0245] Table 7 shows the basic parameters of the imaging lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0246] Table 7

[0247] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 32.377 4.257 1.923 20.88 S2 spherical 189.707 0.635 STO spherical Infinity 0.120 S3 spherical 29.133 5.236 1.593 68.34 S4 spherical -83.955 0.900 1.689 31.16 S5 spherical 13.633 6.239 1.497 81.61 S6 spherical -74.096 0.800 1.923 20.88 S7 spherical 36.493 0.120 S8 spherical 11.830 5.628 1.593 68.34 S9 spherical -47.903 0.800 1.487 70.44 S10 spherical 8.466 6.907 S11 spherical -18.017 4.249 1.741 27.76 S12 spherical -7.482 0.800 2.003 28.32 S13 spherical -17.772 1.496 S14 spherical 34.289 2.260 2.001 29.15 S15 spherical -35.865 0.800 1.487 70.44 S16 spherical 29.830 4.255 S17 spherical Infinity 1.200 1.517 64.20 S18 spherical Infinity 7.300 IMA spherical Infinity - - -

[0248] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 54.002mm, the aperture value is 1.8, the holographic height is 9.12mm, the MTF value of the central field of view at a spatial frequency of 250lp / mm is 0.66, and the MTF value of the peripheral field of view is 0.41.

[0249] In summary, the conditional expressions in Examples 1 to 7 satisfy the relationships shown in Table 8. In Table 8, the unit for all parameters is millimeters (mm).

[0250] Table 8

[0251] Conditional / Example 1 2 3 4 5 6 7 F1 / F 0.917 1.085 0.951 1.029 1.129 1.052 0.826 F2 / F 0.777 0.495 0.745 0.876 0.943 0.803 0.740 F3 / F -0.434 -0.350 -0.408 -0.436 -0.445 -0.409 -0.337 F4 / F 0.478 0.528 0.565 0.522 0.405 0.419 0.473 F5 / F -0.668 -0.657 -0.919 -1.191 -0.481 -0.474 -0.522 F6 / F -0.491 -0.853 -0.656 -0.574 0.482 0.588 0.331 F7 / F 0.278 0.420 0.388 0.329 -0.348 -0.488 -0.293 F8 / F -0.236 -0.267 -0.264 -0.203 0.194 0.204 0.292 F9 / F 0.228 -0.850 -0.242 -0.169 -0.247 -0.277 -0.266 F10 / F -0.531 0.278 0.121 0.090 -0.293 -0.406 0.353 F11 / F -1.141 -1.089 -0.432 -0.245 0.316 0.570 -0.663 FG1 / F 0.806 0.841 0.837 0.785 1.393 1.429 1.687 FG2 / F -0.485 -0.564 -0.463 -0.433 -1.285 -1.406 -0.926 FA1 / F 2.476 4.358 2.331 3.455 1.312 1.243 1.091 FA2 / F 0.529 0.522 0.455 0.411 1.033 1.308 1.229 (RG11-RG12) / TG1 -0.131 -1.565 -0.699 -1.812 -0.047 0.091 -0.559 (RG21-RG22) / TG2 0.192 -0.152 0.510 0.754 0.480 0.267 0.523 T1 / T2 0.908 0.855 1.068 1.137 0.921 0.856 0.845 BFL / H 0.943 0.943 1.034 1.427 0.998 0.998 1.399 FA1 / T1 4.818 8.754 4.179 6.014 2.533 2.495 2.205

[0252] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging lens, characterized in that, Along the optical axis from the object side to the image side, in sequence: A first lens with positive optical power; A second lens with positive optical power; A third lens with negative optical power; A fourth lens with positive optical power; A fifth lens with negative optical power; A sixth lens with negative or positive optical power; A seventh lens with positive or negative optical power; An eighth lens with negative or positive optical power; A ninth lens with positive or negative optical power; A tenth lens with negative or positive optical power; and An eleventh lens with negative or positive optical power; The imaging lens has eleven lenses with optical power. The sixth lens, the seventh lens, and the eighth lens have opposite optical powers between adjacent lenses; The number of lenses with negative optical power among the ninth lens, the tenth lens, and the eleventh lens is two; When the eighth lens has negative optical power, the eleventh lens has negative optical power; When the eighth lens has a positive optical power, the ninth lens has a negative optical power; The imaging lens satisfies the condition: 0.707≤FG1 / F≤1.856; Wherein, FG1 is the combined effective focal length of the first lens to the fifth lens, and F is the effective focal length of the imaging lens.

2. The imaging lens according to claim 1, characterized in that: The optical power of the sixth lens, the eighth lens, the tenth lens, and the eleventh lens is negative, while the optical power of the seventh lens and the ninth lens is positive; or The optical power of the sixth lens, the eighth lens, the ninth lens, and the eleventh lens is negative, while the optical power of the seventh lens and the tenth lens is positive; or The seventh, ninth, and tenth lenses have negative optical power, while the sixth, eighth, and eleventh lenses have positive optical power; or The seventh, ninth, and eleventh lenses have negative optical power, while the sixth, eighth, and tenth lenses have positive optical power.

3. 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 concave. The object-side surface of the second lens is convex, and the image-side surface is convex, concave, or planar. The object-side shape of the third lens is convex, concave, or flat, while the image-side shape is concave. The object-side shape of the fourth lens is convex, and the image-side shape is convex, concave, or planar. The object-side shape of the fifth lens is convex, concave, or flat, while the image-side shape is concave. The object-side surface of the sixth lens is convex, and the image-side surface is either convex or concave.

4. The imaging lens according to claim 1, characterized in that: The seventh lens is convex-convex, the eighth lens is concave-concave, the ninth lens is convex-convex, the tenth lens is concave-convex, concave-concave, or concave-flat, and the eleventh lens is concave-convex. or The seventh lens is convex-convex, the eighth lens is concave-concave, the ninth lens is convex-concave, the tenth lens is convex-convex, and the eleventh lens is either concave-convex or concave-concave; or The seventh lens is convex-concave, the eighth lens is convex-concave, the ninth lens is convex-concave, the tenth lens is convex-convex, and the eleventh lens is concave-convex; or The seventh lens is convex-concave in shape, the eighth lens is convex-convex, concave-convex, or plano-convex in shape, the ninth lens is concave-convex in shape, the tenth lens is concave-concave in shape, and the eleventh lens is convex-convex in shape, or the tenth lens is concave-convex in shape and the eleventh lens is concave-convex in shape. or The seventh lens has a concave-concave shape, the eighth lens has a concave-convex shape, the ninth lens has a concave-convex shape, the tenth lens has a convex-convex shape, and the eleventh lens has a concave-concave shape.

5. The imaging lens according to claim 1, characterized in that: The second lens, the third lens, the fourth lens, and the fifth lens are cemented together to form a first cemented lens group; the sixth lens, the seventh lens, and the eighth lens are cemented together to form a second cemented lens group; and at least two of the ninth lens, the tenth lens, and the eleventh lens are cemented together to form a third cemented lens group. The first lens to the eighth lens are combined to form a first lens group; the ninth lens to the eleventh lens are combined to form a second lens group.

6. The imaging lens according to claim 1, characterized in that: The second lens, the third lens, the fourth lens, and the fifth lens are cemented together to form a first cemented lens group; the sixth lens and the seventh lens are cemented together to form a second cemented lens group; the eighth lens and the ninth lens are cemented together to form a third cemented lens group; and the tenth lens and the eleventh lens are cemented together to form a fourth cemented lens group. The first lens to the seventh lens are combined to form a first lens group; the eighth lens to the eleventh lens are combined to form a second lens group.

7. The imaging lens according to any one of claims 5 or 6, characterized in that, The imaging lens satisfies at least one of the following conditions: -1.547≤FG2 / F≤-0.390, 0.982≤FA1 / F≤4.794, 0.370≤FA2 / F≤1.439 -0.167≤(RG21-RG22) / TG2≤0.829, 0.761≤T1 / T2≤1.251, 1.985≤FA1 / T1≤9.629, Wherein, FG2 is the combined effective focal length of the first cemented lens group and the second cemented lens group, FA1 is the total effective focal length of the first lens group, FA2 is the total effective focal length of the second lens group, RG21 is the radius of curvature of the object-side surface of the first lens of the second cemented lens group, RG22 is the radius of curvature of the image-side surface of the last lens of the second cemented lens group, TG2 is the center distance between the object-side surface of the first lens of the second cemented lens group and the image-side surface of the last lens of the second cemented lens group, T1 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens of the second cemented lens group, and T2 is the center distance between the image-side surface of the last lens of the second cemented lens group and the image plane of the imaging lens.

8. The imaging lens according to any one of claims 1 to 6, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.743≤F1 / F≤1.242, 0.446≤F2 / F≤1.037, -0.490≤F3 / F≤-0.303, 0.365≤F4 / F≤0.622, -1.310≤F5 / F≤-0.427, -0.938≤F6 / F≤0.647, -0.537≤F7 / F≤0.462, -0.294≤F8 / F≤0.321, -0.935≤F9 / F≤0.251, -0.584≤F10 / F≤0.388, -1.255≤F11 / F≤0.627, -1.993≤(RG11-RG12) / TG1≤0.100, 0.849≤BFL / H≤1.570, Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of 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, 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, RG11 is the radius of curvature of the object-side surface of the second lens, RG12 is the radius of curvature of the image-side surface of the fifth lens, TG1 is the center distance from the object-side surface of the second lens to the image-side surface of the fifth lens, BFL is the center distance between the image-side surface of the eleventh lens and the image plane of the imaging lens, and H is the total image height of the imaging lens.

9. The imaging lens according to any one of claims 5 or 6, characterized in that, The imaging lens satisfies at least one of the following conditions: -1.406≤FG2 / F≤-0.433, 1.091≤FA1 / F≤4.358, 0.411≤FA2 / F≤1.308 -0.152≤(RG21-RG22) / TG2≤0.754, 0.845≤T1 / T2≤1.137, 2.205≤FA1 / T1≤8.754, Wherein, FG2 is the combined effective focal length of the first cemented lens group and the second cemented lens group, FA1 is the total effective focal length of the first lens group, FA2 is the total effective focal length of the second lens group, RG21 is the radius of curvature of the object-side surface of the first lens of the second cemented lens group, RG22 is the radius of curvature of the image-side surface of the last lens of the second cemented lens group, TG2 is the center distance between the object-side surface of the first lens of the second cemented lens group and the image-side surface of the last lens of the second cemented lens group, T1 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens of the second cemented lens group, and T2 is the center distance between the image-side surface of the last lens of the second cemented lens group and the image plane of the imaging lens.

10. The imaging lens according to any one of claims 1 to 6, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.826≤F1 / F≤1.129, 0.495≤F2 / F≤0.943, -0.445≤F3 / F≤-0.337, 0.405≤F4 / F≤0.565 -1.191≤F5 / F≤-0.474, -0.853≤F6 / F≤0.588, -0.488≤F7 / F≤0.420, -0.267≤F8 / F≤0.292, -0.850≤F9 / F≤0.228, -0.531≤F10 / F≤0.353, -1.141≤F11 / F≤0.570, 0.785≤FG1 / F≤1.687 -1.812≤(RG11-RG12) / TG1≤0.091, 0.943≤BFL / H≤1.427, Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of 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, 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, RG11 is the radius of curvature of the object-side surface of the second lens, RG12 is the radius of curvature of the image-side surface of the fifth lens, TG1 is the center distance from the object-side surface of the second lens to the image-side surface of the fifth lens, BFL is the center distance between the image-side surface of the eleventh lens and the image plane of the imaging lens, and H is the total image height of the imaging lens.

Images