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 negative or positive refractive power, a third lens with positive or negative refractive power, a fourth lens with negative or positive refractive power, a fifth lens with positive or negative refractive power, a sixth lens with positive or negative refractive power, a seventh lens with negative or positive refractive power, an eighth lens with positive or negative refractive power, and a ninth lens with negative or positive refractive power; the imaging lens has five lenses with positive refractive power and four lenses with negative refractive power; the adjacent two lenses among the second lens, the third lens and the fourth lens have opposite refractive powers; the sixth lens and the seventh lens have opposite refractive powers; and the imaging lens satisfies the condition formula: 0.164<=H / F<=0.295, wherein H is the total image height of the imaging 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, the requirements for imaging accuracy of observation and aiming lenses in complex environments have increased significantly. Large target surface imaging, with its advantages of high resolution, wide dynamic range, and strong detail reproduction, has become the core development direction of high-end observation and aiming lenses. To adapt to all-weather handheld observation and aiming scenarios, lenses also need to take into account miniaturized structure, high-quality imaging, and infrared confocal day and night observation capabilities, while matching high-definition imaging configurations with telephoto lenses and large apertures.

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

[0004] 1. Existing sighting lenses are mostly adapted to small and medium target surfaces of 1 / 2″ and below, making it difficult to adapt to large target surfaces such as 1 / 1.8″ and 1 / 1.2″, which easily leads to problems such as vignetting and poor edge image quality;

[0005] 2. When adapting conventional optical structures to large target surfaces, the lens size needs to be greatly increased, making it impossible to simultaneously meet the requirements of miniaturization and large target surfaces.

[0006] 3. Traditional sighting lenses with infrared confocal capability have limited optical correction capabilities. When adapting to imaging of various large target surfaces, the image quality degrades significantly after switching between visible light and infrared, and cannot simultaneously meet the needs of high-definition imaging of large target surfaces and all-weather observation with infrared confocal capability.

[0007] Therefore, designing a viewing and aiming lens that is suitable for imaging large target surfaces and also features miniaturization, high resolution, infrared confocal focus, telephoto, and large aperture is the current development trend in the industry. Summary of the Invention

[0008] This application provides an imaging lens, which sequentially comprises, along the optical axis from the object side to the image side: a first lens having positive optical power; a second lens having negative or positive optical power; a third lens having positive or negative optical power; a fourth lens having negative or positive optical power; a fifth lens having positive or negative optical power; a sixth lens having positive or negative optical power; a seventh lens having negative or positive optical power; an eighth lens having positive or negative optical power; and a ninth lens having negative or positive optical power; the number of lenses with positive optical power in the imaging lens is [number missing]. Fifth, the number of lenses with negative optical power is four; adjacent lenses in the second, third, and fourth lenses have opposite optical powers; the sixth and seventh lenses have opposite optical powers; the number of lenses with negative optical power in the seventh, eighth, and ninth lenses is two; when the fourth lens has negative optical power, the eighth lens has positive optical power; the imaging lens satisfies the condition: 0.164≤H / F≤0.295; where H is the holoimage height of the imaging lens and F is the effective focal length of the imaging lens.

[0009] According to an exemplary embodiment of this application, the optical power of the second lens, fourth lens, seventh lens, and ninth lens is negative, and the optical power of the third lens, fifth lens, sixth lens, and eighth lens is positive; or the optical power of the third lens, sixth lens, eighth lens, and ninth lens is negative, and the optical power of the second lens, fourth lens, fifth lens, and seventh lens is positive; or the optical power of the third lens, fifth lens, seventh lens, and eighth lens is negative, and the optical power of the second lens, fourth lens, sixth lens, and ninth lens is positive; or the optical power of the third lens, fifth lens, seventh lens, and ninth lens is negative, and the optical power of the second lens, fourth lens, sixth lens, and eighth lens is positive.

[0010] According to an exemplary embodiment of this application, the object-side surface of the first lens is convex, and the image-side surface is convex, concave, or flat; the object-side surface of the second lens is convex, and the image-side surface is convex or concave; the shape of the third lens is convex-convex, the shape of the fourth lens is concave-concave, the shape of the fifth lens is convex-concave, the shape of the sixth lens is convex-convex, the shape of the seventh lens is concave-concave, the shape of the eighth lens is convex-convex, and the shape of the ninth lens is concave-concave; or the shape of the third lens is concave-concave, the shape of the fourth lens is convex-concave, the shape of the fifth lens is convex-convex, the shape of the sixth lens is concave-concave, the shape of the seventh lens is convex-convex, the shape of the eighth lens is concave-concave, and the shape of the ninth lens is concave-concave. The shape is concave-convex; or the third lens is concave-concave, the fourth lens is convex-convex, the fifth lens is concave-concave, the sixth lens is convex-convex, the seventh lens is concave-concave, the eighth lens is convex-concave, and the object side of the ninth lens is convex, while the image side is convex, concave, or flat; or the third lens is concave-concave, the fourth lens is convex-convex, the fifth lens is concave-concave, the sixth lens is convex-convex or convex-concave, the seventh lens is concave-concave or convex-concave, the eighth lens is convex-convex, and the object side of the ninth lens is concave, while the image side is convex, concave, or flat.

[0011] According to an exemplary embodiment of this application, the second lens, the third lens, the fourth lens, and the fifth lens form a first lens group, the sixth lens and the seventh lens form a second lens group, and the eighth lens and the ninth lens form a third lens group; or the second lens, the third lens, and the fourth lens form a first lens group, the fifth lens and the sixth lens form a second lens group, and the seventh lens, the eighth lens, and the ninth lens form a third lens group; or the second lens, the third lens, the fourth lens, and the fifth lens form a first lens group, the sixth lens forms a second lens group, and the seventh lens, the eighth lens, and the ninth lens form a third lens group.

[0012] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: -1.846≤FG1 / F≤22.367, -0.975≤FG2 / F≤27.462, 0.516≤FG3 / F≤1.001, 1.463≤FA1 / F≤2.323. 1.607≤FA1 / FG3≤3.977, 0.155≤dG23 / TTL≤0.287, -6.183≤(RG11-RG12) / TG1≤0.468, 0.296≤(RG21-RG22) / TG2≤1.678, where FG1 is the total effective focal length of the first lens group, FG2 is the total effective focal length of the second lens group, FG3 is the total effective focal length of the third lens group, FA1 is the combined effective focal length of the first lens, the first lens group, and the second lens group, and dG23 is the image-side surface of the last lens in the second lens group and the image-side surface of the first lens in the third lens group. The center distance between the object-side and image-side surfaces, TTL is the total optical length of the imaging lens, RG11 is the radius of curvature of the object-side surface of the first lens in the first lens group, RG12 is the radius of curvature of the image-side surface of the last lens in the first lens group, TG1 is the center distance between the object-side and image-side surfaces of the first and last lenses in the first lens group, RG21 is the radius of curvature of the object-side surface of the first lens in the second lens group, RG22 is the radius of curvature of the image-side surface of the last lens in the second lens group, and TG2 is the center distance between the object-side and image-side surfaces of the first and last lenses in the second lens group.

[0013] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.781≤F1 / F≤1.08, -0.647≤F2 / F≤1.267, -0.463≤F3 / F≤0.413, -0.37≤F4 / F≤0.678, -0.492≤F5 / F≤0.645, -0.287≤F6 / F≤27.462, -0.4≤F7 / F≤0.288. -0.574≤F8 / F≤0.299,-1.161≤F9 / F≤0.221,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, and F9 is the effective focal length of the ninth lens.

[0014] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.132≤BFL / TTL≤0.279, 3.627≤TTL / H≤6.513, where BFL is the center distance between the image-side surface of the ninth lens and the image-side surface of the imaging lens, and TTL is the total optical length of the imaging lens.

[0015] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: -1.678≤FG1 / F≤20.334, -0.886≤FG2 / F≤24.965, 0.573≤FG3 / F≤0.91, 1.626≤FA1 / F≤2.112, 1.786≤FA1 / FG3≤3.615, 0.172≤dG23 / TTL≤0.261, -5.621≤(RG11-RG12) / TG1≤0.425, 0.329≤(RG21-RG22) / TG2≤1.525, where FG1 is the total effective focal length of the first lens group, FG2 is the total effective focal length of the second lens group, FG3 is the total effective focal length of the third lens group, and FA1 is the total effective focal length of the second lens group. The combined effective focal length of the first lens, the first lens group, and the second lens group; dG23 is the center distance between the image-side surface of the last lens in the second lens group and the object-side surface of the first lens in the third lens group; TTL is the total optical length of the imaging lens; RG11 is the radius of curvature of the object-side surface of the first lens in the first lens group; RG12 is the radius of curvature of the image-side surface of the last lens in the first lens group; TG1 is the center distance between the object-side surface of the first lens in the first lens group and the image-side surface of the last lens in the first lens group; RG21 is the radius of curvature of the object-side surface of the first lens in the second lens group; RG22 is the radius of curvature of the image-side surface of the last lens in the second lens group; and TG2 is the center distance between the object-side surface of the first lens in the second lens group and the image-side surface of the last lens in the second lens group.

[0016] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.868≤F1 / F≤0.982, -0.588≤F2 / F≤1.152, -0.421≤F3 / F≤0.375, -0.336≤F4 / F≤0.616, -0.447≤F5 / F≤0.586, -0.261≤F6 / F≤24.965, -0.364≤F7 / F≤0.26 2, -0.522≤F8 / F≤0.272, -1.055≤F9 / F≤0.201, 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, and F9 is the effective focal length of the ninth lens.

[0017] According to an exemplary embodiment of this application, the imaging lens satisfies at least one of the following conditions: 0.147≤BFL / TTL≤0.254, 4.03≤TTL / H≤5.921, 0.182≤H / F≤0.268, where BFL is the center distance between the image-side surface of the ninth lens and the image-side surface of the imaging lens, and TTL is the total optical length of the imaging lens.

[0018] The imaging lens of this application achieves at least one of the following beneficial effects by reasonably setting the number of lenses (e.g., nine), reasonably allocating the optical power of each lens, optimizing the surface shape of each lens, and reasonably setting the range of parameters: miniaturization (TTL≤54.5mm), large aperture (maximum aperture FNO=1.8), large target surface (matching 1 / 1.2″ or 1 / 1.8″ chip), long focal length (F=50mm), infrared confocal, and high resolution. Attached Figure Description

[0019] 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:

[0020] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown;

[0021] Figure 2 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown;

[0022] Figure 3 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown;

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

[0024] Figure 5 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown. Detailed Implementation

[0025] To better understand this application, various aspects of this application are described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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, and a ninth lens.

[0032] In an exemplary embodiment, the first lens may have positive optical power, and its object-side surface may be convex, while its image-side surface may be concave. The positive optical power of the first lens allows it to collect light rays so that they are as close to the optical axis as possible, which helps to reduce the effective aperture of the rear lens, thereby achieving lens miniaturization. The convex object-side surface effectively reduces coma caused by light passing through the first lens, which helps to improve the imaging quality of the imaging lens.

[0033] However, those skilled in the art should understand that since the radius of curvature of the image side of the first 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 radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0034] In an exemplary embodiment, the second lens may have positive optical power, and its object-side surface may be convex, as may its image-side surface. The fact that the second lens has positive optical power and both its object-side and image-side surfaces are convex 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] In an exemplary embodiment, the second 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 second lens can appropriately diverge light rays, widening the gaps between edge light rays and effectively reducing various aberrations generated by light passing through the second lens, thus improving the imaging quality of the imaging lens.

[0036] In an exemplary embodiment, the third lens may have negative optical power, and its object-side surface may be concave, as may its image-side surface. The negative optical power, concave object-side surface, and concave image-side surface of the third lens can effectively balance the spherical aberration introduced by the first lens, thereby improving the imaging quality of the imaging lens.

[0037] In an exemplary embodiment, the third lens may have positive optical power, and its object-side surface may be convex, as may its image-side surface. The fact that the third lens has positive optical power and both its object-side and image-side surfaces are convex can effectively balance the spherical aberration and on-axis chromatic aberration introduced by the first lens, while also effectively reducing astigmatism and field curvature caused by the light passing through the third lens, thus improving the imaging quality of the imaging lens.

[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 can effectively reduce field curvature and transverse chromatic aberration caused by light passing through it, thus improving the imaging quality of the imaging lens.

[0039] In an exemplary embodiment, the fourth lens may have negative optical power, and its object-side surface may be concave, as may its image-side surface. The negative optical power, concave object-side surface, and concave image-side surface of the fourth lens can effectively balance the spherical aberration and on-axis chromatic aberration introduced by the light passing through the first lens, while also effectively reducing other aberrations generated by the light passing through the fourth lens, thus improving the imaging quality of the imaging lens.

[0040] In an exemplary embodiment, the fifth lens may have negative optical power, and its object-side surface may be concave, as may its image-side surface. The negative optical power, concave object-side surface, and concave image-side surface of the fifth lens can effectively balance the spherical aberration and chromatic aberration introduced by 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] In an exemplary embodiment, the fifth 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 fifth lens having positive optical power and a convex object-side surface can effectively balance the spherical aberration and axial chromatic aberration generated by light passing through the preceding optical system, while also effectively reducing field curvature caused by light passing through the fifth lens, thus improving the imaging quality of the imaging lens.

[0042] 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.

[0043] In an exemplary embodiment, the sixth lens may have negative optical power, and its object-side surface may be concave, as may its image-side surface. The negative optical power, concave object-side surface, and concave image-side surface of the sixth lens effectively balance the spherical aberration and chromatic aberration generated by light passing through the preceding optical system, thus improving the imaging quality of the imaging lens; simultaneously, it diverges light, which is beneficial for the lens to achieve a telephoto effect.

[0044] 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 effectively reduce astigmatism and chromatic aberration caused by light passing through it, thus improving the imaging quality of the imaging lens.

[0045] In an exemplary embodiment, the seventh lens may have positive optical power, and both its object-side and image-side surfaces may be convex. The seventh lens having positive optical power, with both its object-side and image-side surfaces being convex, effectively balances the spherical aberration generated by light passing through the preceding optical system, thus improving the imaging quality 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 negative optical power and concave image-side surface of the eighth lens effectively reduce coma caused by light passing through it, thus improving the imaging quality of the imaging lens.

[0047] In an exemplary embodiment, the eighth lens may have positive optical power, and both its object-side and image-side surfaces may be convex. The fact that the eighth lens has positive optical power and both its object-side and image-side surfaces are convex effectively reduces astigmatism caused by light passing through it, thus improving the imaging quality of the imaging lens.

[0048] In an exemplary embodiment, the ninth lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The ninth lens, having positive optical power and a convex object-side surface, combined with the eighth lens having the opposite optical power, allows light to transition smoothly to the image plane, which helps reduce the tolerance sensitivity of the imaging lens.

[0049] In an exemplary embodiment, the ninth lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be convex or concave. The ninth 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 imaging 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.

[0050] However, those skilled in the art should understand that, since the radius of curvature of the image side of the ninth 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.

[0051] In an exemplary embodiment, the second lens, the third lens, the fourth lens and the fifth lens are cemented together to form a four-cemented lens, or the second lens, the third lens and the fourth lens are cemented together to form a three-cemented lens, which can effectively reduce the transverse chromatic aberration of the imaging lens and help the imaging lens achieve the effect of infrared confocal focus.

[0052] In an exemplary embodiment, the fifth lens and the sixth lens are cemented together to form a cemented doublet, or the sixth lens and the seventh lens are cemented together to form a cemented doublet, so that the light transitions smoothly between the optical systems, which helps to reduce the tolerance sensitivity of the imaging lens.

[0053] In an exemplary embodiment, the seventh lens and the eighth lens are cemented together to form a cemented doublet lens, or the eighth lens and the ninth lens are cemented together to form a cemented doublet lens, which can effectively correct various aberrations caused by the preceding optical system and improve the resolving power of the imaging lens.

[0054] In an exemplary embodiment, the second lens, the third lens, the fourth lens, and the fifth lens form a first lens group, the sixth lens and the seventh lens form a second lens group, and the eighth lens and the ninth lens form a third lens group; or the second lens, the third lens, and the fourth lens form a first lens group, the fifth lens and the sixth lens form a second lens group, and the seventh lens, the eighth lens, and the ninth lens form a third lens group; or the second lens, the third lens, the fourth lens, and the fifth lens form a first lens group, the sixth lens form a second lens group, and the seventh lens, the eighth lens, and the ninth lens form a third lens group.

[0055] In an exemplary embodiment, the total optical length (TTL) of the imaging lens can satisfy: TTL≤54.5mm, and further, TTL can satisfy: 52.9mm≤TTL≤54.1mm, thereby achieving the miniaturization requirement of the imaging lens.

[0056] In an exemplary embodiment, the aperture value of the imaging lens can satisfy: FNO≤1.9, and further, FNO can satisfy: 1.8≤FNO≤1.9, thereby achieving the large aperture requirement for the imaging lens.

[0057] In an exemplary embodiment, the holographic height H of the imaging lens can satisfy: H≤13.5mm, and further, H can satisfy: 9.12mm≤H≤13.4mm, thus achieving the requirement for a large target surface of the imaging lens.

[0058] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.781 ≤ F1 / F ≤ 1.08, 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: 0.868 ≤ F1 / F ≤ 0.982, which is even more conducive to achieving lens miniaturization and meeting the requirements of a large aperture.

[0059] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.647 ≤ F2 / F ≤ 1.267, 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, various aberrations generated 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: -0.588 ≤ F2 / F ≤ 1.152, which is even more beneficial to improving the imaging quality of the imaging lens.

[0060] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.463 ≤ F3 / F ≤ 0.413, 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, the spherical aberration and on-axis chromatic aberration introduced by the light passing through the first lens can be effectively balanced, while the astigmatism and field curvature generated by the light passing through the third 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: -0.421 ≤ F3 / F ≤ 0.375, which is even more beneficial to improving the imaging quality of the imaging lens.

[0061] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.37 ≤ F4 / F ≤ 0.678, 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 on-axis chromatic aberration introduced by the light passing through the first lens can be effectively balanced, while other aberrations generated by the 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: -0.336 ≤ F4 / F ≤ 0.616, which is even more beneficial to improving the imaging quality of the imaging lens.

[0062] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.492 ≤ F5 / F ≤ 0.645, 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 on-axis chromatic aberration generated by light passing through the preceding optical system can be effectively balanced, while the field curvature generated by light passing through the fifth lens can be effectively reduced, 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: -0.447 ≤ F5 / F ≤ 0.586, which is more beneficial to improving the imaging quality of the imaging lens and realizing the lens miniaturization function.

[0063] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.287 ≤ F6 / F ≤ 27.462, 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 light transitions smoothly between optical systems, which helps reduce the tolerance sensitivity of the imaging lens; at the same time, it can effectively balance the spherical aberration and on-axis chromatic aberration generated by the light passing through the preceding optical system, which helps improve the imaging quality of the imaging lens; in addition, it can effectively diverge the light, which is beneficial for the lens to achieve a telephoto effect. Preferably, the imaging lens can further satisfy the condition: -0.261 ≤ F6 / F ≤ 24.965, which is more conducive to reducing the tolerance sensitivity of the imaging lens, improving the imaging quality of the imaging lens, and achieving a telephoto effect.

[0064] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.4 ≤ F7 / F ≤ 0.288, 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 generated by light passing through the preceding optical system can be effectively balanced, while the astigmatism and on-axis chromatic aberration generated by light passing through the seventh 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: -0.364 ≤ F7 / F ≤ 0.262, which is even more beneficial to improving the imaging quality of the imaging lens.

[0065] In an exemplary embodiment, the imaging lens can satisfy the condition: -0.574 ≤ F8 / F ≤ 0.299, 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 coma and astigmatism 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: -0.522 ≤ F8 / F ≤ 0.272, which is even more beneficial to improving the imaging quality of the imaging lens.

[0066] In an exemplary embodiment, the imaging lens can satisfy: -1.161≤F9 / F≤0.221, 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; at the same time, it can effectively balance the spherical aberration generated by the light passing through the preceding optical system, which helps improve the imaging quality of the imaging lens; in addition, 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: -1.055≤F9 / F≤0.201, which is more conducive to reducing the tolerance sensitivity of the imaging lens, improving the imaging quality of the imaging lens, and achieving a large target area effect of the imaging lens.

[0067] In an exemplary embodiment, the imaging lens can satisfy the condition: -1.846 ≤ FG1 / F ≤ 22.367, where FG1 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 transverse 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: -1.678 ≤ FG1 / F ≤ 20.334, which is even more beneficial for the imaging lens to achieve infrared confocal effect.

[0068] In an exemplary embodiment, the imaging lens can satisfy: -0.975 ≤ FG2 / F ≤ 27.462, where FG2 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 to reduce the tolerance sensitivity of the imaging lens. Preferably, the imaging lens can further satisfy: -0.886 ≤ FG2 / F ≤ 24.965, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0069] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.516 ≤ FG3 / F ≤ 1.001, where FG3 is the total effective focal length of the third lens group and F is the effective focal length of the imaging lens. By satisfying the above condition, various aberrations caused by the front optical system can be effectively corrected, which is beneficial to improving the lens's resolving power. Preferably, the imaging lens can further satisfy the condition: 0.573 ≤ FG3 / F ≤ 0.91, which is even more beneficial to improving the lens's resolving power.

[0070] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.132 ≤ BFL / TTL ≤ 0.279, where BFL is the center distance between the image-side surface of the ninth lens and the image-side surface of the imaging lens, and TTL is the total optical length of the imaging lens. By satisfying the above condition, the optical back focal length of the imaging lens can be effectively increased, which is beneficial to improving the compatibility of the imaging lens. Preferably, the imaging lens can further satisfy the condition: 0.147 ≤ BFL / TTL ≤ 0.254, which is even more beneficial to improving the compatibility of the imaging lens.

[0071] In an exemplary embodiment, the imaging lens can satisfy the condition: 3.627 ≤ TTL / H ≤ 6.513, where TTL is the total optical length of the imaging lens and H is the full image height of the imaging lens. By making the imaging lens satisfy the above condition, the image height of the imaging lens can be effectively increased, which is beneficial to achieving a large target area effect. Preferably, the imaging lens can further satisfy: 4.03 ≤ TTL / H ≤ 5.921, which is even more conducive to achieving a large target area effect.

[0072] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.164 ≤ H / F ≤ 0.295, where H is the holographic height of the imaging lens and F is the effective focal length of the imaging lens. By satisfying the above condition, the imaging lens can simultaneously achieve both a large target area and a telephoto effect. Preferably, the imaging lens can further satisfy the condition: 0.182 ≤ H / F ≤ 0.268, which is even more beneficial for the imaging lens to simultaneously achieve both a large target area and a telephoto effect.

[0073] In an exemplary embodiment, the imaging lens can satisfy the condition: 1.463 ≤ FA1 / F ≤ 2.323, where FA1 is the combined effective focal length of the first lens, the first lens group, and the second lens group, and F is the effective focal length of the imaging lens. By satisfying the above condition, the refraction angle of light passing through the front lens group can be effectively balanced, avoiding excessive tilting of edge light, ensuring uniform resolution from the center to the edge of the image, and thus improving the resolving power of the imaging lens. Preferably, the imaging lens can further satisfy the condition: 1.626 ≤ FA1 / F ≤ 2.112, which is even more conducive to improving the resolving power of the imaging lens.

[0074] In an exemplary embodiment, the imaging lens can satisfy: 1.607 ≤ FA1 / FG3 ≤ 3.977, where FA1 is the combined effective focal length of the first lens, the first lens group, and the second lens group, and FG3 is the total effective focal length of the third 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: 1.786 ≤ FA1 / FG3 ≤ 3.615, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0075] In an exemplary embodiment, the imaging lens can satisfy the condition: 0.155 ≤ dG23 / TTL ≤ 0.287, where dG23 is the center distance between the image-side surface of the last lens in the second lens group and the object-side surface of the first lens in the third lens group, and TTL is the total optical 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 and facilitates the lens to achieve a telephoto effect. Preferably, the imaging lens can further satisfy the condition: 0.172 ≤ dG23 / TTL ≤ 0.261, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens and achieving a telephoto effect.

[0076] In an exemplary embodiment, the imaging lens can satisfy: -6.183 ≤ (RG11-RG12) / TG1 ≤ 0.468, where RG11 is the radius of curvature of the object-side surface of the first lens in the first lens group, RG12 is the radius of curvature of the image-side surface of the last lens in the first lens group, and TG1 is the center distance between the object-side surface of the first lens and the image-side surface of the last lens in the first 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: -5.621 ≤ (RG11-RG12) / TG1 ≤ 0.425, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0077] In an exemplary embodiment, the imaging lens can satisfy: 0.296 ≤ (RG21-RG22) / TG2 ≤ 1.678, where RG21 is the radius of curvature of the object-side surface of the first lens in the second lens group, RG22 is the radius of curvature of the image-side surface of the last lens in the second 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 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: 0.329 ≤ (RG21-RG22) / TG2 ≤ 1.525, which is even more beneficial for reducing the tolerance sensitivity of the imaging lens.

[0078] The imaging lens according to the above embodiments of this application employs nine 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≤54.5mm), large aperture (maximum aperture FNO=1.8), large target surface (matching 1 / 1.2″ or 1 / 1.8″ chip), long focal length (F=50mm), infrared confocal, and high resolution.

[0079] 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.

[0080] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the imaging lens applicable to the above-described embodiments.

[0081] Example 1

[0082] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown.

[0083] like Figure 1As 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, and a ninth lens L9 along the optical axis.

[0084] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0085] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0086] The third lens L3 has positive optical power, and its object side S4 is convex, while its image side S5 is convex.

[0087] The fourth lens L4 has negative optical power, and its object side S5 is concave, as is its image side S6.

[0088] The fifth lens L5 has positive optical power, with its object side S6 being convex and its image side S7 being concave.

[0089] The sixth lens L6 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.

[0090] The seventh lens L7 has negative optical power, and its object side S9 is concave, and its image side S10 is concave.

[0091] The eighth lens L8 has positive optical power, and its object side S11 is convex, and its image side S12 is convex.

[0092] The ninth lens L9 has negative optical power, and its object side S13 is concave, as is its image side S14.

[0093] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form a four-cemented lens (first lens group G1); the sixth lens L6 and the seventh lens L7 are cemented together to form a doublet lens (second lens group G2); the eighth lens L8 and the ninth lens L9 form the third lens group G3.

[0094] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0095] 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 S15 and an image side surface S16.

[0096] Light from the object passes sequentially through surfaces S1 to S16 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S16 are... Figure 1 Not shown in the image.

[0097] 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).

[0098] Table 1

[0099] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 29.106 3.821 2.001 25.43 S2 spherical 80.980 1.445 STO spherical Infinity 0.844 S3 spherical 38.242 0.900 1.589 61.25 S4 spherical 11.847 8.290 1.593 68.34 S5 spherical -142.653 0.800 1.728 28.32 S6 spherical 13.535 4.286 1.593 68.34 S7 spherical 115.223 0.300 S8 spherical 13.110 3.931 1.497 81.61 S9 spherical -87.877 3.000 2.003 28.32 S10 spherical 10.827 12.095 S11 spherical 31.588 3.668 2.001 25.43 S12 spherical -22.929 1.388 S13 spherical -19.804 1.301 1.713 53.83 S14 spherical 70.713 0.731 S15 spherical Infinity 1.200 1.517 64.20 S16 spherical Infinity 6.000 IMA spherical Infinity - - -

[0100] 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 0.63, and the MTF value of the peripheral field of view is 0.21.

[0101] Example 2

[0102] Figure 2 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown.

[0103] 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, and a ninth lens L9 along the optical axis.

[0104] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0105] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0106] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0107] The fourth lens L4 has positive optical power, with its object side S5 being convex and its image side S6 being concave.

[0108] The fifth lens L5 has positive optical power, and its object side S7 is convex, and its image side S8 is convex.

[0109] The sixth lens L6 has negative optical power, and its object side S8 is concave, as is its image side S9.

[0110] The seventh lens L7 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0111] The eighth lens L8 has negative optical power, and its object side S11 is concave, and its image side S12 is concave.

[0112] The ninth lens L9 has negative optical power, with its object side S13 being concave and its image side S14 being convex.

[0113] The second lens L2, the third lens L3, and the fourth lens L4 are cemented together to form a cemented triplet lens (first lens group G1); the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet lens (second lens group G2); the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet lens; the seventh lens L7, the eighth lens L8, and the ninth lens L9 form the third lens group G3.

[0114] The imaging lens also includes an aperture stop STO, which can be set between the sixth lens L6 and the seventh lens L7.

[0115] 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 S15 and an image side surface S16.

[0116] Light from the object passes sequentially through surfaces S1 to S16 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S16 are... Figure 2 Not shown in the image.

[0117] 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).

[0118] Table 2

[0119] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 29.164 4.251 1.923 20.89 S2 spherical 90.759 1.325 S3 spherical 26.036 4.884 1.438 94.52 S4 spherical -825.122 1.000 1.620 36.35 S5 spherical 13.371 5.445 1.497 81.61 S6 spherical 89.713 0.300 S7 spherical 14.846 4.237 1.497 81.61 S8 spherical -774.472 1.000 1.946 17.94 S9 spherical 12.726 2.122 STO spherical Infinity 11.692 S10 spherical 33.280 2.800 1.805 25.46 S11 spherical -15.047 0.800 1.487 70.39 S12 spherical 85.754 3.696 S13 spherical -14.167 1.647 1.487 70.39 S14 spherical -39.913 0.600 S15 spherical Infinity 1.200 1.517 64.20 S16 spherical Infinity 6.000 IMA spherical Infinity - - -

[0120] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 52.999mm, 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 0.52, and the MTF value of the peripheral field of view is 0.35.

[0121] Example 3

[0122] Figure 3 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown.

[0123] 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, and a ninth lens L9 along the optical axis.

[0124] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0125] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0126] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0127] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0128] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0129] The sixth lens L6 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.

[0130] The seventh lens L7 has negative optical power, and its object side S9 is concave, and its image side S10 is concave.

[0131] The eighth lens L8 has negative optical power, with its object side S11 being convex and its image side S12 being concave.

[0132] The ninth lens L9 has positive optical power, with its object side S12 being convex and its image side S13 being concave.

[0133] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form a four-cemented lens (first lens group G1); the sixth lens L6 and the seventh lens L7 are cemented together to form a cemented doublet lens (second lens group G2); the eighth lens L8 and the ninth lens L9 are cemented together to form a cemented doublet lens (third lens group G3).

[0134] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0135] 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 S14 and an image side surface S15.

[0136] Light from the object passes sequentially through surfaces S1 to S15 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S15 are... Figure 3 Not shown in the image.

[0137] 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).

[0138] Table 3

[0139] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 34.039 4.246 1.911 35.28 S2 spherical 174.153 0.679 STO spherical Infinity 0.200 S3 spherical 24.852 5.700 1.593 68.34 S4 spherical -132.243 0.950 1.654 39.54 S5 spherical 11.000 6.928 1.593 68.34 S6 spherical -76.958 0.700 2.001 25.43 S7 spherical 20.044 0.513 S8 spherical 14.630 3.920 1.923 20.88 S9 spherical -56.766 1.193 1.805 25.46 S10 spherical 10.499 11.508 S11 spherical 36.171 0.700 1.904 31.32 S12 spherical 9.547 3.185 1.954 32.31 S13 spherical 888.581 0.421 S14 spherical Infinity 0.757 1.517 64.20 S15 spherical Infinity 12.400 IMA spherical Infinity - - -

[0140] In this embodiment, the effective focal length of the imaging lens is 50.001mm, the total optical length is 54mm, the aperture value is 1.9, the holographic height is 13.4mm, 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 0.28.

[0141] Example 4

[0142] Figure 4 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown.

[0143] 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, and a ninth lens L9 along the optical axis.

[0144] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0145] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0146] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0147] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0148] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0149] The sixth lens L6 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.

[0150] The seventh lens L7 has negative optical power, and its object side S9 is concave, and its image side S10 is concave.

[0151] The eighth lens L8 has positive optical power, and its object side S11 is convex, and its image side S12 is convex.

[0152] The ninth lens L9 has negative optical power, and its object side S12 is concave, and its image side S13 is concave.

[0153] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form a four-cemented lens (first lens group G1); the sixth lens L6 and the seventh lens L7 are cemented together to form a cemented doublet lens (second lens group G2); the eighth lens L8 and the ninth lens L9 are cemented together to form a cemented doublet lens (third lens group G3).

[0154] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0155] 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 S14 and an image side surface S15.

[0156] Light from the object passes sequentially through surfaces S1 to S15 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S15 are... Figure 4 Not shown in the image.

[0157] 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).

[0158] Table 4

[0159] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 35.229 4.203 1.883 39.22 S2 spherical 198.524 0.632 STO spherical Infinity 0.256 S3 spherical 24.126 6.393 1.593 68.34 S4 spherical -107.020 0.950 1.654 39.54 S5 spherical 11.000 6.541 1.593 68.34 S6 spherical -103.582 0.700 2.001 25.43 S7 spherical 27.371 1.035 S8 spherical 19.330 5.376 1.923 20.88 S9 spherical -30.198 0.744 1.850 30.06 S10 spherical 9.995 9.268 S11 spherical 29.078 3.462 1.703 52.41 S12 spherical -10.995 0.700 1.570 49.45 S13 spherical 620.654 0.584 S14 spherical Infinity 0.757 1.517 64.20 S15 spherical Infinity 12.400 IMA spherical Infinity - - -

[0160] In this embodiment, the effective focal length of the imaging lens is 49.975mm, the total optical length is 54.001mm, the aperture value is 1.9, the holographic height is 13.4mm, 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 0.27.

[0161] Example 5

[0162] Figure 5 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown.

[0163] 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, and a ninth lens L9 along the optical axis.

[0164] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0165] The second lens L2 has positive optical power, and its object side S3 is convex, while its image side S4 is convex.

[0166] The third lens L3 has negative optical power, and its object side S4 is concave, as is its image side S5.

[0167] The fourth lens L4 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.

[0168] The fifth lens L5 has negative optical power, and its object side S6 is concave, as is its image side S7.

[0169] The sixth lens L6 has positive optical power, with its object side S8 being convex and its image side S9 being concave.

[0170] The seventh lens L7 has negative optical power, with its object side S10 being convex and its image side S11 being concave.

[0171] The eighth lens L8 has positive optical power, and its object side S11 is convex, and its image side S12 is convex.

[0172] The ninth lens L9 has negative optical power, with its object side S13 being concave and its image side S14 being convex.

[0173] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are cemented together to form a four-cemented lens (first lens group G1); the sixth lens L6 forms the second lens group G2; the seventh lens L7 and the eighth lens L8 are cemented together to form a doublet lens; the seventh lens L7, the eighth lens L8 and the ninth lens L9 form the third lens group G3.

[0174] The imaging lens also includes an aperture stop STO, which can be set between the first lens L1 and the second lens L2.

[0175] 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 S15 and an image side surface S16.

[0176] Light from the object passes sequentially through surfaces S1 to S16 and is ultimately imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S16 are... Figure 5 Not shown in the image.

[0177] 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).

[0178] Table 5

[0179] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number S1 spherical 37.874 3.384 1.804 46.57 S2 spherical 1365.753 0.263 STO spherical Infinity 0.200 S3 spherical 26.560 4.367 1.593 68.34 S4 spherical -178.661 0.700 1.654 39.54 S5 spherical 11.679 7.075 1.593 68.34 S6 spherical -49.862 0.700 1.835 42.73 S7 spherical 21.102 0.200 S8 spherical 13.211 5.364 1.946 17.94 S9 spherical 10.666 11.805 S10 spherical 128.918 0.700 1.723 37.99 S11 spherical 12.123 2.870 1.834 37.21 S12 spherical -30.461 2.115 S13 spherical -19.224 0.700 2.001 29.15 S14 spherical -30.380 0.400 S15 spherical Infinity 0.757 1.517 64.20 S16 spherical Infinity 12.400 IMA spherical Infinity - - -

[0180] In this embodiment, the effective focal length of the imaging lens is 50mm, the total optical length is 54mm, the aperture value is 1.9, the holographic height is 13.4mm, the MTF value of the central field of view at a spatial frequency of 250lp / mm is 0.59, and the MTF value of the peripheral field of view is 0.31.

[0181] In summary, the conditional expressions in Examples 1 to 5 satisfy the relationships shown in Table 6. In Table 6, the unit for all parameters is millimeters (mm).

[0182] Table 6

[0183] Conditional / Example 1 2 3 4 5 F1 / F 0.868 0.891 0.910 0.982 0.954 F2 / F -0.588 1.152 0.713 0.687 0.778 F3 / F 0.375 -0.421 -0.308 -0.312 -0.329 F4 / F -0.336 0.616 0.333 0.348 0.330 F5 / F 0.508 0.586 -0.314 -0.447 -0.348 F6 / F 0.464 -0.261 0.256 0.281 24.965 F7 / F -0.188 0.262 -0.216 -0.181 -0.364 F8 / F 0.272 -0.522 -0.289 0.240 0.211 F9 / F -0.429 -0.917 0.201 -0.387 -1.055 FG1 / F 20.334 6.989 -0.734 -1.678 -0.927 FG2 / F -0.427 -0.591 12.547 -0.886 24.965 FG3 / F 0.573 0.910 0.681 0.584 0.803 BFL / TTL 0.147 0.147 0.251 0.254 0.251 TTL / H 5.921 5.811 4.030 4.030 4.030 H / F 0.182 0.182 0.268 0.268 0.268 FA1 / F 1.836 1.626 1.817 2.112 1.800 FA1 / FG3 3.206 1.786 2.668 3.615 2.242 dG23 / TTL 0.224 0.261 0.213 0.172 0.219 (RG11-RG12) / TG1 -5.392 -5.621 0.337 -0.223 0.425 (RG21-RG22) / TG2 0.329 0.405 0.808 1.525 0.474

[0184] 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 having negative or positive optical power; A third lens with positive or negative optical power; A fourth lens with negative or positive optical power; A fifth lens with positive or negative optical power; A sixth lens with positive or negative optical power; A seventh lens with negative or positive optical power; An eighth lens with positive or negative optical power; and A ninth lens with negative or positive optical power; The imaging lens has five lenses with positive optical power and four lenses with negative optical power. The second lens, the third lens, and the fourth lens have opposite optical powers between adjacent lenses; The sixth lens and the seventh lens have opposite optical powers; The number of lenses with negative optical power among the seventh lens, the eighth lens, and the ninth lens is two; When the fourth lens has negative optical power, the eighth lens has positive optical power; The imaging lens satisfies the condition: 0.164 ≤ H / F ≤ 0.295; Wherein, H is the holographic height of the imaging lens, and F is the effective focal length of the imaging lens.

2. The imaging lens according to claim 1, characterized in that: The second, fourth, seventh, and ninth lenses have negative optical power, while the third, fifth, sixth, and eighth lenses have positive optical power; or The third, sixth, eighth, and ninth lenses have negative optical power, while the second, fourth, fifth, and seventh lenses have positive optical power; or The third, fifth, seventh, and eighth lenses have negative optical power, while the second, fourth, sixth, and ninth lenses have positive optical power; or The third, fifth, seventh, and ninth lenses have negative optical power, while the second, fourth, sixth, and eighth 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 either convex, concave, or flat. The object-side surface of the second lens is convex, and the image-side surface is either convex or concave. The third lens is convex-convex, the fourth lens is concave-concave, the fifth lens is convex-concave, the sixth lens is convex-convex, the seventh lens is concave-concave, the eighth lens is convex-convex, and the ninth lens is concave-concave; or The third lens has a concave-concave shape, the fourth lens has a convex-concave shape, the fifth lens has a convex-convex shape, the sixth lens has a concave-concave shape, the seventh lens has a convex-convex shape, the eighth lens has a concave-concave shape, and the ninth lens has a concave-convex shape. or The third lens is concave-concave, the fourth lens is convex-convex, the fifth lens is concave-concave, the sixth lens is convex-convex, the seventh lens is concave-concave, the eighth lens is convex-concave, and the object-side surface of the ninth lens is convex, while the image-side surface is convex, concave, or flat; or The third lens is concave-concave in shape, the fourth lens is convex-convex in shape, the fifth lens is concave-concave in shape, the sixth lens is convex-convex or convex-concave in shape, the seventh lens is concave-concave or convex-concave in shape, the eighth lens is convex-convex in shape, and the object side of the ninth lens is concave, while the image side is convex, concave, or flat.

4. The imaging lens according to claim 1, characterized in that: The second lens, the third lens, the fourth lens, and the fifth lens form a first lens group; the sixth lens and the seventh lens form a second lens group; and the eighth lens and the ninth lens form a third lens group. or The second lens, the third lens, and the fourth lens form a first lens group; the fifth lens and the sixth lens form a second lens group; and the seventh lens, the eighth lens, and the ninth lens form a third lens group. or The second lens, the third lens, the fourth lens, and the fifth lens form a first lens group; the sixth lens forms a second lens group; and the seventh lens, the eighth lens, and the ninth lens form a third lens group.

5. The imaging lens according to claim 4, characterized in that, The imaging lens satisfies at least one of the following conditions: -1.846≤FG1 / F≤22.367, -0.975≤FG2 / F≤27.462, 0.516≤FG3 / F≤1.001, 1.463≤FA1 / F≤2.323, 1.607≤FA1 / FG3≤3.977, 0.155≤dG23 / TTL≤0.287 -6.183≤(RG11-RG12) / TG1≤0.468, 0.296≤(RG21-RG22) / TG2≤1.678, Wherein, FG1 is the total effective focal length of the first lens group, FG2 is the total effective focal length of the second lens group, FG3 is the total effective focal length of the third lens group, FA1 is the combined effective focal length of the first lens, the first lens group, and the second lens group, dG23 is the center distance between the image-side surface of the last lens of the second lens group and the object-side surface of the first lens of the third lens group, TTL is the total optical length of the imaging lens, RG11 is the radius of curvature of the object-side surface of the first lens of the first lens group, RG12 is the radius of curvature of the image-side surface of the last lens of the first lens group, TG1 is the center distance between the object-side surface of the first lens of the first lens group and the image-side surface of the last lens of the first lens group, RG21 is the radius of curvature of the object-side surface of the first lens of the second lens group, RG22 is the radius of curvature of the image-side surface of the last lens of the second lens group, and TG2 is the center distance between the object-side surface of the first lens of the second lens group and the image-side surface of the last lens of the second lens group.

6. The imaging lens according to any one of claims 1 to 4, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.781≤F1 / F≤1.08, -0.647≤F2 / F≤1.267, -0.463≤F3 / F≤0.413, -0.37≤F4 / F≤0.678 -0.492≤F5 / F≤0.645, -0.287≤F6 / F≤27.462, -0.4≤F7 / F≤0.288, -0.574≤F8 / F≤0.299, -1.161≤F9 / F≤0.221, 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, and F9 is the effective focal length of the ninth lens.

7. The imaging lens according to any one of claims 1 to 4, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.132≤BFL / TTL≤0.279, 3.627≤TTL / H≤6.513 Wherein, BFL is the center distance between the image-side surface of the ninth lens and the image-side surface of the imaging lens, and TTL is the total optical length of the imaging lens.

8. The imaging lens according to claim 4, characterized in that, The imaging lens satisfies at least one of the following conditions: -1.678≤FG1 / F≤20.334, -0.886≤FG2 / F≤24.965, 0.573≤FG3 / F≤0.91, 1.626≤FA1 / F≤2.112, 1.786≤FA1 / FG3≤3.615, 0.172≤dG23 / TTL≤0.261, -5.621≤(RG11-RG12) / TG1≤0.425, 0.329≤(RG21-RG22) / TG2≤1.525, Wherein, FG1 is the total effective focal length of the first lens group, FG2 is the total effective focal length of the second lens group, FG3 is the total effective focal length of the third lens group, FA1 is the combined effective focal length of the first lens, the first lens group, and the second lens group, dG23 is the center distance between the image-side surface of the last lens of the second lens group and the object-side surface of the first lens of the third lens group, TTL is the total optical length of the imaging lens, RG11 is the radius of curvature of the object-side surface of the first lens of the first lens group, RG12 is the radius of curvature of the image-side surface of the last lens of the first lens group, TG1 is the center distance between the object-side surface of the first lens of the first lens group and the image-side surface of the last lens of the first lens group, RG21 is the radius of curvature of the object-side surface of the first lens of the second lens group, RG22 is the radius of curvature of the image-side surface of the last lens of the second lens group, and TG2 is the center distance between the object-side surface of the first lens of the second lens group and the image-side surface of the last lens of the second lens group.

9. The imaging lens according to any one of claims 1 to 4, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.868≤F1 / F≤0.982, -0.588≤F2 / F≤1.152, -0.421≤F3 / F≤0.375, -0.336≤F4 / F≤0.616 -0.447≤F5 / F≤0.586, -0.261≤F6 / F≤24.965, -0.364≤F7 / F≤0.262, -0.522≤F8 / F≤0.272 -1.055≤F9 / F≤0.201, 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, and F9 is the effective focal length of the ninth lens.

10. The imaging lens according to any one of claims 1 to 4, characterized in that, The imaging lens satisfies at least one of the following conditions: 0.147≤BFL / TTL≤0.254, 4.03≤TTL / H≤5.921, 0.182≤H / F≤0.268 BFL is the center distance between the image-side surface of the ninth lens and the image-side surface of the imaging lens, and TTL is the total optical length of the imaging lens.

Images