Optical imaging lens

Abstract

The optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has positive focal power; the seventh lens has negative focal power; the eighth lens has positive focal power; the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface. The number of the lenses with focal power in the optical imaging lens is nine.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, to an optical imaging lens. Background Art

[0002] With the increasing emphasis on work in the field of public safety, people have put forward higher requirements for the demand and imaging quality of security fixed-focus lenses such as surveillance facilities.

[0003] Currently, security lenses with an aperture of F1.6 - F2.5 and smaller apertures usually adopt dual-band confocal technology to achieve day and night shooting, but the switching between day and night states requires relatively complex structural support; while using day-night full-color technology can optimize the structure. Compared with the traditional dual-band confocal technology, the structure of day-night full-color technology is simpler, which is more conducive to cost control and efficient and convenient production.

[0004] In order to achieve day-night full-color, an optical lens needs to have a larger aperture. However, large-aperture lenses (such as FNO ≤ 1.1) usually have a longer overall optical length, resulting in a larger lens volume, and the lens resolution often only meets the standard of 5MP, which does not match the pursuit of miniaturization and high resolution in the security field, and it is difficult to simultaneously achieve a large aperture, miniaturization, and high lens resolution.

[0005] Therefore, in view of the above deficiencies of the prior art, the present invention provides an optical imaging lens that can simultaneously meet the requirements of a large aperture, a large target surface, low cost, miniaturization, high illuminance, and 4K high resolution. Summary of the Invention

[0006] This application provides an optical imaging lens, which sequentially includes, along the optical axis from the object side to the image side: a first lens with a negative focal power; a second lens with a negative focal power, having a concave object surface and a convex image surface; a third lens with a positive focal power; a fourth lens with a negative focal power; a fifth lens with a positive focal power; a sixth lens with a positive focal power; a seventh lens with a negative focal power; an eighth lens with a positive focal power; and a ninth lens with a positive focal power, having a convex object surface and a concave image surface. The number of lenses with focal power in this optical imaging lens is nine.

[0007] According to an exemplary embodiment of the present application, the object surface of the first lens of this optical imaging lens is convex and the image surface is concave; the object surface of the third lens is convex and the image surface is concave; the object surface of the fourth lens is convex and the image surface is concave; the object surface of the fifth lens is convex and the image surface is convex; the object surface of the sixth lens is convex and the image surface is convex; the object surface of the seventh lens is concave and the image surface is concave; the object surface of the eighth lens is convex and the image surface is convex.

[0008] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: -35 ≤ f2 / f ≤ -21, 5.56 ≤ f3 / f ≤ 12.8, 1.91 ≤ fa / f ≤ 3.41, -1.02 ≤ f7 / f8 ≤ -0.58, 18 ≤ f9 / f ≤ 30, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, fa is the combined effective focal length of the fourth lens and the fifth 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, and f is the total effective focal length of the optical imaging lens.

[0009] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: 0.14 ≤ f / TTL ≤ 0.19, 5.73 ≤ TTL / BFL ≤ 7.26, 0.10 ≤ d12 / TTL ≤ 0.15, 0.32 ≤ DM3 / TTL ≤ 0.42, 0.14 ≤ da / TTL ≤ 0.23, 0.21 ≤ (d67 + d78 + d7) / f ≤ 0.32, where f is the total effective focal length of the optical imaging lens, TTL is the overall optical length of the optical imaging lens, BFL is the back focal length of the optical imaging lens, d12 is the on-axis air gap distance from the image side of the first lens to the object side of the second lens, DM3 is the clear aperture value of the object side of the third lens, da is the on-axis distance from the object side of the fourth lens to the image side of the fifth lens, d67 is the on-axis air gap distance from the image side of the sixth lens to the object side of the seventh lens, d78 is the on-axis air gap distance from the image side of the seventh lens to the object side of the eighth lens, and d7 is the central thickness of the seventh lens.

[0010] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: 0.018 ≤ |ND3 - ND2| / f ≤ 0.032, 6.34 ≤ |VD5 - VD4| / f ≤ 13.60, 0.009 ≤ |SAG1 - SAG2| / f ≤ 0.06, where ND2 is the refractive index of the second lens, ND3 is the refractive index of the third lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, f is the total effective focal length of the optical imaging lens, SAG1 is the sag value at the full clear aperture of the object side of the ninth lens, and SAG2 is the sag value at the half clear aperture of the object side of the ninth lens.

[0011] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: -32.20 ≤ f2 / f ≤ -21.58, 6.17 ≤ f3 / f ≤ 11.64, 2.12 ≤ fa / f ≤ 3.11, -0.93 ≤ f7 / f8 ≤ -0.65, 18.26 ≤ f9 / f ≤ 28.08, 0.16 ≤ f / TTL ≤ 0.18, 6.36 ≤ TTL / BFL ≤ 6.61, 0.11 ≤ d12 / TTL ≤ 0.14, 0.35 ≤ DM3 / TTL ≤ 0.38, 0.16 ≤ da / TTL ≤ 0.21, 0.23 ≤ (d67 + d78 + d7) / f ≤ 0.29, 0.02 ≤ |ND3 - ND2| / f ≤ 0.03, 7.04 ≤ |VD5 - VD4| / f ≤ 12.37, 0.01 ≤ |SAG1 - SAG2| / f ≤ 0.055, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, fa is the combined effective focal length of the fourth lens and the fifth 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, f is the total effective focal length of the optical imaging lens, TTL is the overall optical length of the optical imaging lens, BFL is the back focal length of the optical imaging lens, d12 is the on-axis air separation distance from the image side of the first lens to the object side of the second lens, DM3 is the clear aperture value of the object side of the third lens, da is the on-axis distance from the object side of the fourth lens to the image side of the fifth lens, d67 is the on-axis air separation distance from the image side of the sixth lens to the object side of the seventh lens, d78 is the on-axis air separation distance from the image side of the seventh lens to the object side of the eighth lens, d7 is the center thickness of the seventh lens, ND2 is the refractive index of the second lens, ND3 is the refractive index of the third lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, SAG1 is the sag value at the full clear aperture of the object side of the ninth lens, and SAG2 is the sag value at the half clear aperture of the object side of the ninth lens.

[0012] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: -1.87 ≤ f1 / f ≤ -1.66, 1.39 ≤ f5 / f ≤ 1.87, 2.41 ≤ f6 / f ≤ 3.32, -2.23 ≤ f7 / f ≤ -1.77, where f1 is the effective focal length of the first 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, and f is the total effective focal length of the optical imaging lens.

[0013] According to an exemplary embodiment of the present application, the optical imaging lens satisfies at least one of the following conditional expressions: -4.63 ≤ f4 / f ≤ -3.15, 2.39 ≤ f8 / f ≤ 2.74, where f4 is the effective focal length of the fourth lens, f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the optical imaging lens.

[0014] By reasonably setting the number of lenses (e.g., nine lenses) in the optical imaging lens of the present application, reasonably distributing the optical power of each lens, and optimizing the surface shape of each lens, the optical imaging lens provided by the present application simultaneously satisfies the characteristics of a large aperture (FNO ≤ 1.1), miniaturization (TTL ≤ 30.2 mm), a large target surface (matching a 1 / 1.8" chip), high illuminance (relative illuminance ≥ 45%), and 4K high resolution. Description of the Drawings

[0015] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0016] Figure 1 is a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application;

[0017] Figure 2 is a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application;

[0018] Figure 3 is a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application;

[0019] Figure 4 is a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application;

[0020] Figure 5 is a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application;

[0021] Figure 6 is a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application. Detailed Embodiments

[0022] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0024] In the drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0025] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0026] It should also be understood that terms such as "comprising", "having", "including", etc., 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. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0027] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] According to an exemplary embodiment of the present application, the optical imaging lens may sequentially include nine lenses with optical power along the optical axis from the object side to the image side, namely, 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.

[0030] In the exemplary embodiment, the first lens of the optical imaging lens has a negative optical power. The object side surface of the first lens is convex, and the image side surface is concave. Such a setting can effectively converge the incident light, diverge the large-field light entering the optical system to the rear optical system, and effectively increase the light transmission amount.

[0031] In the exemplary embodiment, since the curvature radius value of the object side surface of the first lens is relatively large, it is easy for the convex surface, flat surface, and concave surface to change or be finely adjusted with each other, and generally has a small impact on the overall technical effect of the optical system. Those skilled in the art can use the surface with a relatively large curvature radius as the optimization boundary condition. Obviously, no creative work is required.

[0032] In the exemplary embodiment, the second lens of the optical imaging lens has a negative optical power. The object side surface of the second lens is concave, and the image side surface is convex. Such a setting is beneficial to controlling the light path, making the light transition smoothly, effectively correcting aberration, and improving the resolution of the lens; at the same time, it effectively controls the height of light transmission, enables the light to better pass through the aperture and be transmitted to the rear of the optical system, increases the light transmission amount, and realizes a large aperture of the optical lens.

[0033] In the exemplary embodiment, the third lens of the optical imaging lens has a positive optical power. The object side surface of the third lens is convex, and the image side surface is concave. Such a setting can effectively balance the aberration generated by the light passing through the aperture, is beneficial to improving the image quality, and is also beneficial to realizing stable optical performance of the lens under high and low temperature conditions.

[0034] In the exemplary embodiment, the fourth lens of the optical imaging lens has a negative optical power. The object side surface of the fourth lens is convex, and the image side surface is concave. Such a setting can effectively control the light path and balance the field curvature of the optical system, which is beneficial to realizing high image quality of the lens.

[0035] In the exemplary embodiment, the fifth lens of the optical imaging lens has a positive optical power. The object side surface of the fifth lens is convex, and the image side surface is convex. Such a setting can balance the spherical aberration of the optical system, which is beneficial to realizing high image quality. The fifth lens cooperates with the fourth lens with negative optical power, which is beneficial to better balancing the chromatic aberration of the optical system. At the same time, it can better control the light path, make the light transition smoothly, effectively reduce the tolerance sensitivity between the lenses, is beneficial to improving the production yield of the lens, and can also improve the imaging quality of the lens to achieve 4K high resolution.

[0036] In an exemplary embodiment, the fourth lens has a negative optical power, and the fifth lens has a positive optical power. The fourth lens and the fifth lens can form a doublet lens, effectively balancing the axial chromatic aberration, improving the imaging quality of the lens, and achieving a high resolution of 4K. At the same time, it can also effectively reduce the tolerance sensitivity between the lenses, which is beneficial to ensuring the production yield of the lens.

[0037] In an exemplary embodiment, the sixth lens of the optical imaging lens has a positive optical power. The object side of the sixth lens is convex, and the image side is convex. Such a setting helps to balance the astigmatism of the optical system and improve the imaging quality of the lens.

[0038] In an exemplary embodiment, the seventh lens of the optical imaging lens has a negative optical power. The object side of the seventh lens is concave, and the image side is concave. Such a setting can effectively balance the negative spherical aberration generated by the positive lens at the rear end of the optical system, which is beneficial to achieving 4K resolution. At the same time, it can effectively and smoothly transmit light, reduce the tolerance sensitivity, and improve the production yield of the lens.

[0039] In an exemplary embodiment, the eighth lens of the optical imaging lens has a positive optical power. The object side of the eighth lens is convex, and the image side is convex. Such a setting can effectively control the trend of light, make the light transition smoothly, balance the field curvature of the entire optical system, and at the same time effectively control the trend of light, ensure the transmission height of light, which is beneficial to achieving a large image plane.

[0040] In an exemplary embodiment, the ninth lens of the optical imaging lens has a positive optical power. The object side of the ninth lens is convex, and the image side is concave. Such a setting can further adjust the trend of light at the end of the optical system, ensure the light height of the light transmitted to the imaging plane, which is beneficial to achieving a large image plane, and at the same time is also beneficial to achieving a high illuminance of the optical system.

[0041] In an exemplary embodiment, the optical imaging lens satisfies: -35 ≤ f2 / f ≤ -21, where f2 is the effective focal length of the second lens, and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the second lens to the total effective focal length of the optical imaging lens, it helps the light to transition smoothly, effectively control the transmission height of the light, make the light better pass through the aperture and transmit to the rear of the optical system, increase the light transmission amount, make the aperture number FNO of the optical lens ≤ 1.1, achieve a large aperture of the lens, and at the same time is also beneficial to correcting aberration and improving the resolution of the lens. In addition, setting a larger focal length of the second lens can reduce its tolerance sensitivity, which is beneficial to production and processing and ensures the lens quality. More specifically, f2 and f further satisfy -32.20 ≤ f2 / f ≤ -21.58.

[0042] In an exemplary embodiment, the optical imaging lens satisfies: 5.56 ≤ f3 / f ≤ 12.8, where f3 is the effective focal length of the third lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the third lens to the total effective focal length of the optical imaging lens, the smooth transmission of light is effectively controlled, which helps to achieve a large aperture of the optical imaging lens, so that the aperture FNO ≤ 1.1. At the same time, it can also balance the aberration generated when light passes through the aperture, improving the imaging quality of the lens. In addition, setting the third lens to have a positive focal power value is beneficial to balancing the spherical aberration generated by the lens due to high and low temperatures, improving the high and low temperature performance. More specifically, f3 and f can further satisfy 6.17 ≤ f3 / f ≤ 11.64.

[0043] In an exemplary embodiment, the optical imaging lens satisfies: 1.91 ≤ fa / f ≤ 3.41, where fa is the combined effective focal length of the fourth lens and the fifth lens, and f is the total effective focal length of the optical imaging lens. By reasonably configuring the ratio of the combined effective focal length of the fourth lens and the fifth lens to the total effective focal length of the optical imaging lens, the system chromatic aberration can be effectively reduced, the resolution can be improved, and the high-resolution performance of 4K resolution can be achieved; at the same time, the tolerance sensitivity between lenses can be reduced, which is beneficial to improving the production yield. More specifically, fa and f can further satisfy 2.12 ≤ fa / f ≤ 3.11.

[0044] In an exemplary embodiment, the optical imaging lens satisfies: -1.02 ≤ f7 / f8 ≤ -0.58, where f7 is the effective focal length of the seventh lens and f8 is the effective focal length of the eighth lens. By reasonably distributing the ratio of the effective focal lengths of the seventh lens and the eighth lens, the combined use of positive and negative lenses is realized, the aberration of the optical system is effectively reduced, and high resolution of the lens is achieved. More specifically, f7 and f8 can further satisfy -0.93 ≤ f7 / f8 ≤ -0.65.

[0045] In an exemplary embodiment, the optical imaging lens satisfies: 18 ≤ f9 / f ≤ 30, where f9 is the effective focal length of the ninth lens and f is the total effective focal length of the optical imaging lens. By reasonably distributing the ratio of the effective focal length of the ninth lens to the total effective focal length of the optical imaging lens, the trend of light at the end of the optical system can be further adjusted, the light height and the light passing amount of the light transmitted to the imaging surface can be guaranteed, which is beneficial to achieving a large target surface and high illumination. At the same time, it can also effectively balance the off-axis aberration, which is beneficial to ensuring the image quality under a large target surface. In addition, setting the ninth lens to have a larger focal length can reduce the tolerance sensitivity of its lens, which is beneficial to production and processing and ensures the lens quality. More specifically, f9 and f can further satisfy 18.26 ≤ f9 / f ≤ 28.08.

[0046] In an exemplary embodiment, the optical imaging lens satisfies: 0.14 ≤ f / TTL ≤ 0.19, where f is the total effective focal length of the optical imaging lens and TTL is the overall optical length of the optical imaging lens. When the focal length value of a certain optical imaging lens is satisfied, by reasonably controlling the overall optical length of the optical imaging lens, a smaller overall optical length is obtained, which is beneficial to realizing the miniaturization of the lens. More specifically, f and TTL further satisfy 0.16 ≤ f / TTL ≤ 0.18.

[0047] In an exemplary embodiment, the optical imaging lens satisfies: 5.73 ≤ TTL / BFL ≤ 7.26, where TTL is the overall optical length of the optical imaging lens and BFL is the back focal length of the optical imaging lens. On the basis of realizing miniaturization, by controlling the back focal length of the optical lens, the back focal of the lens is made longer, which helps to reserve space for the installation of optical elements, facilitates the assembly of the optical lens, avoids interference, and improves the assembly yield of the optical lens. More specifically, TTL and BFL further satisfy 6.36 ≤ TTL / BFL ≤ 6.61.

[0048] In an exemplary embodiment, the optical imaging lens satisfies: 0.10 ≤ d12 / TTL ≤ 0.15, where d12 is the on-axis air gap distance from the image side of the first lens to the object side of the second lens, and TTL is the overall optical length of the optical imaging lens. By reasonably setting the ratio of the on-axis air gap distance from the image side of the first lens to the object side of the second lens to the overall optical length of the optical imaging lens, it is beneficial to reduce the off-axis aberration generated at the front end of the lens and improve the resolution performance of the edge field of view. More specifically, d12 and TTL further satisfy 0.11 ≤ d12 / TTL ≤ 0.14.

[0049] In an exemplary embodiment, the optical imaging lens satisfies: 0.32 ≤ DM3 / TTL ≤ 0.42, where DM3 is the total clear aperture value of the object side of the third lens, and TTL is the overall optical length of the optical imaging lens. By controlling the ratio of the total clear aperture value of the object side of the third lens to the overall optical length of the optical imaging lens, the volume of the optical system can be controlled, which is beneficial to the miniaturization of the lens. More specifically, DM3 and TTL further satisfy 0.35 ≤ DM3 / TTL ≤ 0.38.

[0050] In an exemplary embodiment, the optical imaging lens satisfies: 0.14 ≤ da / TTL ≤ 0.23, where da is the on-axis distance from the object side of the fourth lens to the image side of the fifth lens, and TTL is the overall optical length of the optical imaging lens. By reasonably distributing the ratio of the on-axis distance from the object side of the fourth lens to the image side of the fifth lens to the overall optical length of the optical imaging lens, it helps to balance the system aberration and at the same time reduce the material cost brought by the lens thickness, which is beneficial to realizing low cost. More specifically, da and TTL further satisfy 0.16 ≤ da / TTL ≤ 0.21.

[0051] In an exemplary embodiment, the optical imaging lens satisfies: 0.21 ≤ (d67 + d78 + d7) / f ≤ 0.32, where d67 is the on-axis air spacing distance from the image side of the sixth lens to the object side of the seventh lens, d78 is the on-axis air spacing distance from the image side of the seventh lens to the object side of the eighth lens, d7 is the central thickness of the seventh lens, and f is the total effective focal length of the optical imaging lens. Reasonably allocating the central thickness of the seventh lens and the air spacing distances before and after the seventh lens helps to ensure actual processability while reducing system astigmatism, which is beneficial to achieving high resolution. More specifically, d67, d78, d7, and f further satisfy 0.23 ≤ (d67 + d78 + d7) / f ≤ 0.29.

[0052] In an exemplary embodiment, the optical imaging lens satisfies: 0.018 ≤ |ND3 - ND2| / f ≤ 0.032, where ND2 is the refractive index of the second lens, ND3 is the refractive index of the third lens, and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the refractive index difference between the second lens and the third lens to the total effective focal length of the optical imaging lens, the aberration generated when light passes through the aperture can be reduced, which is beneficial to the clear imaging of the lens. More specifically, ND3, ND2, and f further satisfy 0.02 ≤ |ND3 - ND2| / f ≤ 0.03.

[0053] In an exemplary embodiment, the optical imaging lens satisfies: 6.34 ≤ |VD5 - VD4| / f ≤ 13.60, where VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, and f is the total effective focal length of the optical imaging lens. By reasonably matching the Abbe numbers of the fourth lens and the fifth lens, the axial chromatic aberration of the system can be effectively balanced, the risk of purple fringing in the product can be reduced, which is beneficial to the color restoration degree of the lens picture and improves the imaging quality of the lens. More specifically, VD4, VD5, and f further satisfy 7.04 ≤ |VD5 - VD4| / f ≤ 12.37.

[0054] In an exemplary embodiment, the optical imaging lens satisfies: 0.009 ≤ |SAG1 - SAG2| / f ≤ 0.06, where SAG1 is the sagitta value at the full aperture of the object side of the ninth lens, SAG2 is the sagitta value at the half aperture of the object side of the ninth lens, and f is the total effective focal length of the optical imaging lens. By reasonably controlling the lens shape of the ninth lens so that the object side of the ninth lens has at least one inflection point, it is beneficial to balance the coma of the optical system and ensure high image quality in the edge field of view when meeting a large target surface. Exemplarily, the optical imaging lens further satisfies 0.01 ≤ |SAG1 - SAG2| / f ≤ 0.055.

[0055] In an exemplary embodiment, the optical imaging lens satisfies: -1.87 ≤ f1 / f ≤ -1.66, where f1 is the effective focal length of the first lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the first lens to the total effective focal length of the optical imaging lens, the incident light can be effectively converged, the large-field light entering the optical system can be diverged to the rear of the optical system, the light passing amount can be effectively increased, the illuminance of the optical system can be improved, and at the same time, the field angle can be effectively enlarged.

[0056] In an exemplary embodiment, the optical imaging lens satisfies: 1.39 ≤ f5 / f ≤ 1.87, where f5 is the effective focal length of the fifth lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the fifth lens to the total effective focal length of the optical imaging lens, the spherical aberration of the system can be balanced, which is beneficial to achieving high image quality under a large target surface.

[0057] In an exemplary embodiment, the optical imaging lens satisfies: 2.41 ≤ f6 / f ≤ 3.32, where f6 is the effective focal length of the sixth lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical imaging lens, the astigmatism generated by the light passing through the two spherical lenses of the fourth lens and the fifth lens can be balanced, which is beneficial to improving the resolution.

[0058] In an exemplary embodiment, the optical imaging lens satisfies: -2.23 ≤ f7 / f ≤ -1.77, where f7 is the effective focal length of the seventh lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the seventh lens to the total effective focal length of the optical imaging lens, positive spherical aberration can be introduced to balance the negative spherical aberration generated when the light passes through the two positive lenses of the eighth lens and the ninth lens, which is beneficial to improving the resolution.

[0059] In an exemplary embodiment, the optical imaging lens satisfies: -4.63 ≤ f4 / f ≤ -3.15, where f4 is the effective focal length of the fourth lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical imaging lens, the light can be effectively converged, and at the same time, the field curvature can be corrected, which is beneficial to the lens to achieve miniaturization and high image quality.

[0060] In an exemplary embodiment, the optical imaging lens satisfies: 2.39 ≤ f8 / f ≤ 2.74, where f8 is the effective focal length of the eighth lens and f is the total effective focal length of the optical imaging lens. By reasonably controlling the ratio of the effective focal length of the eighth lens to the total effective focal length of the optical imaging lens, the field curvature of the overall optical system can be effectively balanced, and the resolution of the lens can be improved; at the same time, the direction of the light can be effectively controlled, the height of the light transmission can be ensured, and the light can be quickly focused on the imaging surface, which is beneficial to achieving a large target surface.

[0061] In an exemplary embodiment, by adopting the combination of a spherical lens and an aspherical lens, the present application is conducive to reducing the processing difficulty of the lens; at the same time, through material combination, an athermal design can be achieved. The present application does not specifically limit the specific number of the spherical lens and the aspherical lens. When focusing on reflecting the imaging quality, the number of aspherical lenses can be increased, and even all lenses can be aspherical lenses. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After adopting an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality of the lens. However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the lens surface type constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. Exemplarily, in the present application, the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical lenses, and the fourth lens and the fifth lens are spherical lenses.

[0062] Those skilled in the art should understand that the refractive index temperature coefficient dn / dt and abnormal dispersion of plastics are relatively large. Reasonably matching an appropriate amount of plastic materials is conducive to high and low temperature balance, but too many plastic lenses are not conducive to system stability. The optical lens made of glass can suppress the shift of the back focal length of the optical lens with temperature change to improve system stability; at the same time, using glass materials can avoid the problem that the imaging of the lens is blurred due to the high and low temperature changes in the use environment, which affects the normal use of the lens. Using glass materials is conducive to the athermalization of the lens. In addition, using glass materials can also better correct the chromatic aberration of the system, improve the resolution of the lens, and at the same time reduce the generation of ghost images. As an example, in the present application, the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens adopt plastic materials, and the fourth lens and the fifth lens adopt glass materials. Such a setting can enable the optical imaging lens to have a wide temperature range and maintain stable optical performance in the range of -40°C to 80°C.

[0063] In an exemplary embodiment, the total optical length TTL of the optical imaging lens of the present application can satisfy: TTL ≤ 30.2 mm. The total optical length is short, the structure is compact, and the miniaturization of the lens can be achieved.

[0064] In an exemplary embodiment, the image height H corresponding to the maximum field of view angle of the optical imaging lens of the present application can satisfy: H ≥ 8.8 mm. Further, H can satisfy: 8.8 mm ≤ H ≤ 8.85 mm. A large target surface of the lens can be achieved.

[0065] In an exemplary embodiment, the aperture number Fno of the optical imaging lens of the present application satisfies: Fno ≤ 1.1. Further, Fno can satisfy: 1.0 ≤ Fno ≤ 1.09, which can ensure that the optical imaging lens has the characteristic of a large aperture, enabling the lens to have a large light transmission amount, realizing full-color imaging day and night for the lens, and the relative illuminance of the lens ≥ 45%.

[0066] The optical imaging lens of the present application may further include a diaphragm for restricting light beams. The diaphragm is beneficial to converging the light rays entering the optical lens, reducing the maximum light transmission aperture of the optical lens, and reducing the assembly sensitivity of the optical system, so as to further improve the imaging quality of the optical lens. It should be noted that the diaphragm can be set at any position between or on one side of any lenses according to actual needs. Exemplarily, the diaphragm is set between the second lens and the third lens.

[0067] The optical imaging lens of the present application has excellent resolution. When the spatial frequency is 150 lp / mm, the MTF values within the entire field of view are all above 0.4, and it can be paired with a camera to achieve 4K high-resolution characteristics.

[0068] Optionally, in other alternative exemplary embodiments, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0069] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although nine lenses are described as an example in the embodiment, the optical imaging lens is not limited to including nine lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0070] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the drawings.

[0071] Embodiment 1

[0072] Figure 1 The structural schematic diagram of the optical imaging lens of Embodiment 1 of the present application is shown. As Figure 1 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0073] The first lens L1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface.

[0074] The second lens L2 has a negative optical power, its object side S3 is concave, and its image side S4 is convex.

[0075] The third lens L3 has a positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0076] The fourth lens L4 has a negative optical power, its object side S7 is convex, and its image side S8 is concave.

[0077] The fifth lens L5 has a positive optical power, its object side S8 is convex, and its image side S9 is convex.

[0078] The sixth lens L6 has a positive optical power, its object side S10 is convex, and its image side S11 is convex.

[0079] The seventh lens L7 has a negative optical power, its object side S12 is concave, and its image side S13 is concave.

[0080] The eighth lens L8 has a positive optical power, its object side S14 is convex, and its image side S15 is convex.

[0081] The ninth lens L9 has a positive optical power, its object side S16 is convex, and its image side S17 is concave.

[0082] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0083] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0084] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. The light from the object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 1 not shown.

[0085] Table 1 shows the basic parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0086] Table 1

[0087]

[0088] In Embodiment 1, the object sides and the image sides of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0089]

[0090] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspheric mirror surface in Example 1.

[0091] Table 2

[0092]

[0093]

[0094] For the optical imaging lens of Example 1, when the spatial frequency is 150 lp / mm, the MTF values within the entire field of view are all above 0.45, and during the process from the center to the edge of the field of view, the MTF curve decreases uniformly and smoothly, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the field of view angle is the largest, the relative illumination value of the optical imaging lens is 46%, indicating that the imaging system has good relative illumination.

[0095] Example 2

[0096] Figure 2 Shows a schematic structural diagram of the optical imaging lens of Example 2 of the present application. As Figure 2 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0097] The first lens L1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface.

[0098] The second lens L2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface.

[0099] The third lens L3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface.

[0100] The fourth lens L4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface.

[0101] The fifth lens L5 has a positive optical power, its object side surface S8 is a convex surface, and its image side surface S9 is a convex surface.

[0102] The sixth lens L6 has a positive optical power, its object side S10 is convex, and its image side S11 is convex.

[0103] The seventh lens L7 has a negative optical power, its object side S12 is concave, and its image side S13 is concave.

[0104] The eighth lens L8 has a positive optical power, its object side S14 is convex, and its image side S15 is convex.

[0105] The ninth lens L9 has a positive optical power, its object side S16 is convex, and its image side S17 is concave.

[0106] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0107] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0108] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. The light from the object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 2 herein.

[0109] Table 3 shows the basic parameter table of the optical imaging lens of Embodiment 2, wherein the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0110] Table 3

[0111]

[0112] In Embodiment 2, the object sides and the image sides of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical surfaces, and the surface profiles of the respective aspherical lenses can be defined by, but not limited to, the formula (1) given in the above Embodiment 1. Table 4 below gives the conic coefficients k and the higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the respective aspherical surfaces in Embodiment 2.

[0113] Table 4

[0114]

[0115]

[0116] When the spatial frequency of the optical imaging lens of this Embodiment 2 is 150 lp / mm, the MTF values within the entire field of view are all above 0.44, and the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the field of view angle is at its maximum, the relative illumination value of the optical imaging lens is 47%, indicating that the imaging system has good relative illumination.

[0117] Embodiment 3

[0118] Figure 3 The structural schematic diagram of the optical imaging lens of Embodiment 3 of the present application is shown. As Figure 3 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0119] The first lens L1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface.

[0120] The second lens L2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface.

[0121] The third lens L3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface.

[0122] The fourth lens L4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface.

[0123] The fifth lens L5 has a positive optical power, its object side surface S8 is a convex surface, and its image side surface S9 is a convex surface.

[0124] The sixth lens L6 has a positive optical power, its object side surface S10 is a convex surface, and its image side surface S11 is a convex surface.

[0125] The seventh lens L7 has a negative optical power, its object side surface S12 is a concave surface, and its image side surface S13 is a concave surface.

[0126] The eighth lens L8 has a positive optical power, its object side surface S14 is a convex surface, and its image side surface S15 is a convex surface.

[0127] The ninth lens L9 has a positive optical power, its object side surface S16 is a convex surface, and its image side surface S17 is a concave surface.

[0128] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0129] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0130] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. Light from the object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 3 the figure.

[0131] Table 5 shows the basic parameter table of the optical imaging lens of Embodiment 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0132] Table 5

[0133]

[0134]

[0135] In Embodiment 3, the object sides and the image sides of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the formula (1) given in Embodiment 1 above. Table 6 below gives the conic coefficients k and the higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the respective aspherical surfaces in Embodiment 3.

[0136] Table 6

[0137] Face number k A4 A6 A8 A10 A12 A14 A16 S1 83.77 -5.26E-04 3.28E-05 -1.07E-06 1.50E-08 -8.11E-11 0.00E+00 0.00E+00 S2 -1.02 3.87E-04 1.07E-04 -6.99E-06 6.51E-07 -1.23E-08 -7.43E-10 3.97E-11 S3 -1.36 1.91E-03 -8.71E-05 7.04E-06 -3.83E-07 1.36E-08 -2.58E-10 4.45E-12 S4 -1.00 1.67E-03 -3.41E-05 1.52E-06 -8.58E-08 3.46E-09 -1.12E-10 1.29E-12 S5 -5.65 7.78E-04 -1.62E-05 8.85E-07 -2.20E-08 1.11E-10 7.87E-12 -1.19E-13 S6 -22.03 -1.13E-05 1.26E-05 3.07E-07 -9.18E-09 1.92E-11 7.66E-12 -7.47E-14 S10 -2.81 -1.05E-03 3.41E-05 -1.63E-06 3.77E-08 2.23E-09 -1.73E-10 4.21E-12 S11 8.73 5.32E-04 -1.17E-04 1.94E-06 2.26E-07 -8.79E-10 -6.28E-10 1.61E-11 S12 36.28 6.99E-05 -1.35E-05 -5.04E-06 6.24E-07 -1.32E-08 -4.69E-10 1.54E-11 S13 -24.02 3.22E-04 -2.82E-05 1.81E-06 3.10E-08 -3.31E-10 -8.57E-11 6.90E-13 S14 2.58 5.71E-04 -3.03E-05 1.17E-06 -1.39E-09 -6.50E-10 2.17E-11 -1.49E-13 S15 -2.07 2.64E-04 5.27E-07 -9.93E-07 5.01E-08 -5.28E-10 -4.60E-11 2.31E-12 S16 -4.28 -1.62E-03 -9.73E-05 1.31E-06 2.08E-07 -1.95E-09 -3.22E-10 7.32E-12 S17 -1.05 -3.65E-03 -5.04E-05 5.66E-06 -4.17E-08 -3.87E-09 1.55E-11 1.82E-12

[0138] For the optical imaging lens of this Embodiment 3, when the spatial frequency is 150 lp / mm, the MTF values within the entire field of view are all above 0.43, and the MTF curve uniformly and smoothly decreases during the process from the center to the edge field of view, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the maximum field of view angle is reached, the relative illumination value of the optical imaging lens is 47%, indicating that the imaging system has good relative illumination.

[0139] Embodiment 4

[0140] Figure 4 shows a schematic structural diagram of the optical imaging lens of Embodiment 4 of the present application. As Figure 4 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0141] The first lens L1 has a negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0142] The second lens L2 has a negative optical power, with its object side S3 being concave and its image side S4 being convex.

[0143] The third lens L3 has a positive optical power, with its object side S5 being convex and its image side S6 being concave.

[0144] The fourth lens L4 has a negative optical power, with its object side S7 being convex and its image side S8 being concave.

[0145] The fifth lens L5 has a positive optical power, with its object side S8 being convex and its image side S9 being convex.

[0146] The sixth lens L6 has a positive optical power, with its object side S10 being convex and its image side S11 being convex.

[0147] The seventh lens L7 has a negative optical power, with its object side S12 being concave and its image side S13 being concave.

[0148] The eighth lens L8 has a positive optical power, with its object side S14 being convex and its image side S15 being convex.

[0149] The ninth lens L9 has a positive optical power, with its object side S16 being convex and its image side S17 being concave.

[0150] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0151] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0152] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. Light from an object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 4 not shown.

[0153] Table 7 shows the basic parameter table of the optical imaging lens of Example 4, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0154] Table 7

[0155]

[0156]

[0157] In Embodiment 4, the object side and the image side of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are both aspherical surfaces. The surface profiles of the aspherical lenses can be defined by, but are not limited to, the formula (1) given in Embodiment 1 above. Table 8 below gives the conic coefficients k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspherical surfaces in Embodiment 4.

[0158] Table 8

[0159] Face number k A4 A6 A8 A10 A12 A14 A16 S1 34.92 -4.32E-04 2.97E-05 -1.02E-06 1.68E-08 -1.17E-10 0.00E+00 0.00E+00 S2 -0.91 4.91E-04 1.06E-04 -6.97E-06 6.96E-07 -1.40E-08 -1.00E-09 6.16E-11 S3 -1.12 1.67E-03 -7.66E-05 6.53E-06 -3.99E-07 1.40E-08 -1.81E-10 8.67E-14 S4 -0.79 1.51E-03 -3.26E-05 1.59E-06 -8.64E-08 3.47E-09 -1.00E-10 1.05E-12 S5 -5.80 7.13E-04 -1.69E-05 8.78E-07 -2.19E-08 9.61E-11 7.58E-12 -1.09E-13 S6 -26.23 -5.55E-05 1.33E-05 2.93E-07 -1.07E-08 -1.44E-11 7.17E-12 -5.69E-14 S10 -2.34 -9.87E-04 3.86E-05 -1.55E-06 3.83E-08 2.14E-09 -1.83E-10 3.80E-12 S11 -6.85 6.15E-04 -1.16E-04 2.02E-06 2.28E-07 -9.56E-10 -6.42E-10 1.60E-11 S12 33.98 -5.26E-05 -1.50E-05 -5.08E-06 6.29E-07 -1.32E-08 -4.70E-10 1.53E-11 S13 -17.14 5.15E-04 -2.90E-05 1.91E-06 3.83E-08 -1.92E-10 -8.80E-11 5.56E-13 S14 2.54 4.70E-04 -2.64E-05 1.38E-06 1.61E-09 -6.65E-10 1.80E-11 -5.47E-13 S15 -0.77 1.66E-04 8.36E-07 -8.25E-07 5.34E-08 -8.16E-10 -6.07E-11 2.26E-12 S16 -4.10 -1.64E-03 -1.12E-04 1.07E-06 2.22E-07 -1.62E-09 -3.36E-10 6.81E-12 S17 -1.14 -3.67E-03 -6.75E-05 5.98E-06 -3.72E-08 -3.96E-09 1.67E-11 1.56E-12

[0160] For the optical imaging lens of Embodiment 4, when the spatial frequency is 150 lp / mm, the MTF values within the entire field of view are all above 0.41, and the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the field of view angle is the largest, the relative illumination value of the optical imaging lens is 47%, indicating that the imaging system has good relative illumination.

[0161] Embodiment 5

[0162] Figure 5 The structural schematic diagram of the optical imaging lens of Embodiment 5 of the present application is shown. As Figure 5 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0163] The first lens L1 has a negative optical power. Its object side S1 is a convex surface, and its image side S2 is a concave surface.

[0164] The second lens L2 has a negative optical power. Its object side S3 is a concave surface, and its image side S4 is a convex surface.

[0165] The third lens L3 has a positive optical power. Its object side S5 is a convex surface, and its image side S6 is a concave surface.

[0166] The fourth lens L4 has a negative optical power. Its object side S7 is a convex surface, and its image side S8 is a concave surface.

[0167] The fifth lens L5 has a positive optical power. Its object side S8 is a convex surface, and its image side S9 is a convex surface.

[0168] The sixth lens L6 has a positive optical power. Its object side S10 is a convex surface, and its image side S11 is a convex surface.

[0169] The seventh lens L7 has a negative optical power. Its object side S12 is a concave surface, and its image side S13 is a concave surface.

[0170] The eighth lens L8 has a positive focal power, its object side S14 is convex, and its image side S15 is convex.

[0171] The ninth lens L9 has a positive focal power, its object side S16 is convex, and its image side S17 is concave.

[0172] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0173] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0174] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. The light from the object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 5 not shown.

[0175] Table 9 shows the basic parameter table of the optical imaging lens of Embodiment 5, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0176] Table 9

[0177]

[0178]

[0179] In Embodiment 5, the object sides and the image sides of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the formula (1) given in Embodiment 1 above. Table 10 below gives the conic coefficients k and the higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspherical surfaces in Embodiment 5.

[0180] Table 10

[0181] Face number k A4 A6 A8 A10 A12 A14 A16 S1 22.29 -7.36E-04 3.56E-05 -9.36E-07 1.41E-08 -9.70E-11 0.00E+00 0.00E+00 S2 -1.14 1.67E-04 9.56E-05 -8.17E-06 6.84E-07 -1.24E-08 -1.15E-09 5.91E-11 S3 -1.21 1.63E-03 -1.36E-04 7.91E-06 -3.32E-07 1.16E-08 -2.94E-10 5.74E-12 S4 -0.82 1.59E-03 -4.44E-05 1.62E-06 -7.17E-08 3.87E-09 -1.07E-10 8.62E-13 S5 -8.34 8.02E-04 -1.54E-05 8.18E-07 -2.22E-08 1.44E-10 8.68E-12 -1.61E-13 S6 -16.07 1.99E-04 1.42E-05 2.41E-07 -1.50E-08 7.41E-11 1.82E-11 -3.77E-13 S10 -2.70 -1.07E-03 3.35E-05 -1.65E-06 3.28E-08 1.85E-09 -1.81E-10 4.97E-12 S11 7.83 5.35E-04 -1.18E-04 2.01E-06 2.30E-07 -8.68E-10 -6.27E-10 1.66E-11 S12 36.39 -1.33E-04 -1.54E-05 -5.10E-06 6.33E-07 -1.31E-08 -4.67E-10 1.57E-11 S13 -13.25 6.17E-04 -2.59E-05 2.15E-06 4.16E-08 -4.11E-10 -1.05E-10 -3.25E-14 S14 2.85 6.49E-04 -2.59E-05 1.19E-06 -6.80E-10 -2.94E-10 2.38E-11 -1.04E-12 S15 -0.66 1.93E-04 -7.89E-06 -1.18E-06 5.88E-08 -2.74E-10 -4.75E-11 1.56E-12 S16 -4.56 -1.96E-03 -9.30E-05 1.68E-06 2.07E-07 -2.25E-09 -3.40E-10 6.99E-12 S17 -1.06 -3.66E-03 -4.79E-05 5.50E-06 -4.64E-08 -3.93E-09 2.39E-11 1.45E-12

[0182] When the spatial frequency of the optical imaging lens in this Embodiment 5 is 150 lp / mm, the MTF values within the entire field of view are all above 0.48, and the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the field of view is at its maximum, the relative illumination value of the optical imaging lens is 50%, indicating that the imaging system has good relative illumination.

[0183] Embodiment 6

[0184] Figure 6 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application. As Figure 6 shown, the optical imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0185] The first lens L1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave.

[0186] The second lens L2 has a negative optical power, its object side surface S3 is concave, and its image side surface S4 is convex.

[0187] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave.

[0188] The fourth lens L4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave.

[0189] The fifth lens L5 has a positive optical power, its object side surface S8 is convex, and its image side surface S9 is convex.

[0190] The sixth lens L6 has a positive optical power, its object side surface S10 is convex, and its image side surface S11 is convex.

[0191] The seventh lens L7 has a negative optical power, its object side surface S12 is concave, and its image side surface S13 is concave.

[0192] The eighth lens L8 has a positive optical power, its object side surface S14 is convex, and its image side surface S15 is convex.

[0193] The ninth lens L9 has a positive optical power, its object side surface S16 is convex, and its image side surface S17 is concave.

[0194] Among them, the fourth lens L4 and the fifth lens L5 form a doublet lens.

[0195] The optical imaging lens further includes a stop STO, and the stop STO can be disposed between the second lens L2 and the third lens L3.

[0196] The optical imaging lens may further include a filter (not shown) having an object side and an image side and / or a protective glass PB having an object side S18 and an image side S19. The filter can be used to correct color deviation, and the protective glass PB can be used to protect the image sensing chip located at the imaging surface. Light from the object sequentially passes through the surfaces S1 to S19 and finally forms an image on the imaging surface IMA. It should be noted that the surfaces S1 to S19 are not shown in Figure 6 the figure.

[0197] Table 11 shows the basic parameter table of the optical imaging lens of Embodiment 6, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0198] Table 11

[0199]

[0200] In Embodiment 6, the object sides and the image sides of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the formula (1) given in the above Embodiment 1. Table 12 below gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the respective aspherical surfaces in Embodiment 6.

[0201] Table 12

[0202] Face number k A4 A6 A8 A10 A12 A14 A16 S1 -90.31 -7.51E-04 3.68E-05 -9.33E-07 1.32E-08 -8.35E-11 0.00E+00 0.00E+00 S2 -1.22 1.14E-04 1.06E-04 -8.64E-06 6.89E-07 -1.11E-08 -1.11E-09 5.46E-11 S3 -1.26 1.67E-03 -1.38E-04 8.00E-06 -3.23E-07 1.17E-08 -3.33E-10 6.38E-12 S4 -0.89 1.64E-03 -4.64E-05 1.65E-06 -7.16E-08 3.86E-09 -1.03E-10 5.00E-13 S5 -8.75 8.23E-04 -1.52E-05 8.20E-07 -2.22E-08 1.42E-10 8.54E-12 -1.60E-13 S6 -18.80 2.03E-04 1.51E-05 2.63E-07 -1.45E-08 7.75E-11 1.82E-11 -3.94E-13 S10 -2.41 -1.08E-03 3.20E-05 -1.65E-06 3.05E-08 1.73E-09 -1.82E-10 5.21E-12 S11 8.74 5.29E-04 -1.20E-04 1.96E-06 2.30E-07 -8.12E-10 -6.26E-10 1.64E-11 S12 35.53 -1.49E-04 -1.49E-05 -5.05E-06 6.34E-07 -1.31E-08 -4.70E-10 1.56E-11 S13 -11.30 4.69E-04 -2.44E-05 2.20E-06 4.22E-08 -3.08E-10 -9.95E-11 -6.60E-14 S14 2.83 6.58E-04 -2.72E-05 1.25E-06 2.87E-09 -2.35E-10 2.33E-11 -1.03E-12 S15 -2.71 2.87E-04 -1.03E-05 -1.28E-06 5.53E-08 -3.32E-10 -4.61E-11 1.70E-12 S16 -4.54 -1.82E-03 -1.04E-04 1.30E-06 2.08E-07 -2.03E-09 -3.34E-10 7.21E-12 S17 -1.23 -3.73E-03 -4.88E-05 5.50E-06 -4.94E-08 -3.94E-09 2.79E-11 1.65E-12

[0203] For the optical imaging lens of this Embodiment 5, when the spatial frequency is 150 lp / mm, the MTF values within the entire field of view are all above 0.46, and during the process from the center to the edge field of view, the MTF curve decreases uniformly and smoothly, indicating that the optical imaging lens has good imaging quality and good detail resolution ability; moreover, when the field of view angle is the largest, the relative illumination value of the optical imaging lens is 48%, indicating that the imaging system has good relative illumination.

[0204] In summary, the optical imaging lenses in Embodiments 1 to 6 respectively satisfy the relationships shown in Table 13. Among them, the units of the parameters f, H, and DW3 of the optical imaging lens in each embodiment are millimeter (mm), and FNO has no unit.

[0205] Table 13

[0206]

[0207]

[0208] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power; The second lens has a negative optical power, the object side surface of which is concave and the image side surface of which is convex; a third lens having positive refractive power; a fourth lens having negative optical power; a fifth lens having positive refractive power; a sixth lens having positive refractive power; a seventh lens having negative optical power; an eighth lens having positive refractive power; and The ninth lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The number of lenses having optical power in the optical imaging lens is nine.

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

3. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: -35≤f2 / f≤-21, 5.56≤f3 / f≤12.8, 1.91≤fa / f≤3.41, -1.02≤f7 / f8≤-0.58, 18≤f9 / f≤30, Among them, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, fa is the combined effective focal length of the fourth lens and the fifth 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, and f is the total effective focal length of the optical imaging lens.

4. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: 0.14≤f / TTL≤0.19, 5.73≤TTL / BFL≤7.26, 0.10≤d12 / TTL≤0.15, 0.32≤DM3 / TTL≤0.42, 0.14≤da / TTL≤0.23, 0.21≤(d67+d78+d7) / f≤0.32, Among them, f is the total effective focal length of the optical imaging lens, TTL is the total optical length of the optical imaging lens, BFL is the optical back focus of the optical imaging lens, d12 is the axial air spacing distance from the image side of the first lens to the object side of the second lens, DM3 is the full aperture value of the object side of the third lens, da is the axial distance from the object side of the fourth lens to the image side of the fifth lens, d67 is the axial air spacing distance from the image side of the sixth lens to the object side of the seventh lens, d78 is the axial air spacing distance from the image side of the seventh lens to the object side of the eighth lens, and d7 is the center thickness of the seventh lens.

5. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: 0.018≤|ND3-ND2| / f≤0.032, 6.34≤|VD5-VD4| / f≤13.60, 0.009≤|SAG1-SAG2| / f≤0.06, Among them, ND2 is the refractive index of the second lens, ND3 is the refractive index of the third lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, f is the total effective focal length of the optical imaging lens, SAG1 is the sag value of the object side of the ninth lens at the full aperture, and SAG2 is the sag value of the object side of the ninth lens at the half aperture.

6. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: -32.20≤f2 / f≤-21.58, 6.17≤f3 / f≤11.64, 2.12≤fa / f≤3.11, -0.93≤f7 / f8≤-0.65, 18.26≤f9 / f≤28.08, 0.16≤f / TTL≤0.18, 6.36≤TTL / BFL≤6.61, 0.11≤d12 / TTL≤0.14, 0.35≤DM3 / TTL≤0.38, 0.16≤da / TTL≤0.21, 0.23≤(d67+d78+d7) / f≤0.29, 0.02≤|ND3-ND2| / f≤0.03, 7.04≤|VD5-VD4| / f≤12.37, 0.01≤|SAG1-SAG2| / f≤0.055, Wherein, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, fa is the combined effective focal length of the fourth lens and the fifth 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, f is the total effective focal length of the optical imaging lens, TTL is the total optical length of the optical imaging lens, BFL is the optical back focus of the optical imaging lens, d12 is the axial air spacing distance from the image side surface of the first lens to the object side surface of the second lens, DM3 is the full aperture value of the object side surface of the third lens, and da is the total effective focal length of the optical imaging lens. The on-axis distance from the object side of the fourth lens to the image side of the fifth lens, d67 is the on-axis air spacing distance from the image side of the sixth lens to the object side of the seventh lens, d78 is the on-axis air spacing distance from the image side of the seventh lens to the object side of the eighth lens, d7 is the center thickness of the seventh lens, ND2 is the refractive index of the second lens, ND3 is the refractive index of the third lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, SAG1 is the sagittal value of the object side of the ninth lens at the full aperture of the light passing through, and SAG2 is the sagittal value of the object side of the ninth lens at the half aperture of the light passing through.

7. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: -1.87≤f1 / f≤-1.66, 1.39≤f5 / f≤1.87, 2.41≤f6 / f≤3.32, -2.23≤f7 / f≤-1.77, Among them, f1 is the effective focal length of the first 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, and f is the total effective focal length of the optical imaging lens.

8. The optical imaging lens according to claim 1 or 2, characterized in that: The optical imaging lens satisfies at least one of the following conditions: -4.63≤f4 / f≤-3.15, 2.39≤f8 / f≤2.74, Among them, f4 is the effective focal length of the fourth lens, f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the optical imaging lens.

Images