Optical imaging lens

Abstract

The present application relates to an optical imaging lens, comprising a lens barrel, and an imaging lens group and a plurality of spacer elements arranged in the lens barrel, the imaging lens group comprising a first lens, a second lens and a third lens; the plurality of spacer elements comprising a first spacer element and a second spacer element; the optical imaging lens satisfies: 66.89°≤HFOV≤82.73°; 5.63≤D0m / TD*Fno≤7.04; 0.94≤|f12| / (D2m-d2m)≤3.54; wherein, HFOV is half of the maximum field of view angle of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, TD is the axial distance from the object side surface of the first lens to the image side surface of the third lens; Fno is the aperture number of the optical imaging lens, f12 is the combined focal length of the first lens and the second lens, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element. The optical imaging lens of the present application can effectively solve the problem of stray light by constraining the second spacer element, and has the advantages of large field of view angle and slight stray light.

Description

TECHNICAL FIELD

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

[0002] With the development of optical lenses, lenses gradually develop towards large image surface and large field of view. Wide-angle lenses have a wide range of applications due to their wide coverage and ability to highlight details and levels of scenes. In addition to the mobile phone field, the market demand for security, automobiles, and unmanned aerial vehicles is increasing. However, conventional wide-angle lenses, such as the Chinese invention patent with publication number CN119395860B, disclose an optical imaging lens comprising a lens barrel, an optical lens group, and a spacer element group arranged in the lens barrel. The optical lens group comprises, in order from the object side to the image side along the optical axis, a first lens with negative focal power, a second lens with positive focal power, and a third lens with positive focal power. The object side of the first lens is concave, and the image side is concave. The image side of the second lens is convex. The object side of the third lens is convex. The spacer element group comprises a second spacer element arranged on the image side of the second lens and in contact with the image side of the second lens. At a large field of view, incident light is easily reflected at the position of the intermediate lens mechanism, causing stray light problems and affecting the imaging quality. Therefore, it is urgent to provide an optical imaging lens to reduce stray light at a large field of view. SUMMARY

[0003] To solve the above-mentioned problems in the prior art, the purpose of the present application is to provide an optical imaging lens to reduce stray light of the optical imaging lens at a large field of view.

[0004] To achieve the above-mentioned purpose of the application, the present application provides an optical imaging lens comprising a lens barrel, an imaging lens group, and a plurality of spacer elements arranged in the lens barrel,

[0005] The imaging lens group comprises, in order from the object side to the image side along the optical axis, a first lens with negative focal power, a second lens with positive focal power, and a third lens with positive focal power. The first lens to the third lens are arranged in order along the optical axis from the object side to the image side. Each lens has at least one object side surface facing the object side and one image side surface facing the image side. The object side surface and the image side surface of the first lens are both concave. The object side surface of the second lens is convex. The image side surface of the third lens is convex. There is an air gap between adjacent lenses.

[0006] The plurality of spacer elements comprises a first spacer element located between the first lens and the second lens and at least partially abutting the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and at least partially abutting the image side surface of the second lens.

[0007] The optical imaging lens satisfies:

[0008] 66.89°≤HFOV≤82.73°;

[0009] 5.63≤D0m / TD*Fno≤7.04;

[0010] 0.94≤|f12| / (D2m-d2m)≤3.54;

[0011] wherein HFOV is half of a maximum field of view angle of the optical imaging lens, D0m is an outer diameter of an image side end of the lens barrel, TD is an on-axis distance from an object side surface of the first lens to an image side surface of the third lens, Fno is an F number of the optical imaging lens, f12 is a combined focal length of the first lens and the second lens, D2m is an outer diameter of the image side surface of the second spacer element, and d2m is an inner diameter of the image side surface of the second spacer element.

[0012] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 0.99≤EP01 / (CT1+T12)≤1.69;

[0013] wherein EP01 is a separation distance in the direction along the optical axis from an object side end of the lens barrel to an object side surface of the first spacer element, CT1 is a central thickness of the first lens in the optical axis direction, and T12 is an air separation of the first lens and the second lens in the optical axis direction.

[0014] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 0.64≤d1m / d2s≤2.08;

[0015] wherein d1m is an inner diameter of the image side surface of the first spacer element, and d2s is an inner diameter of the object side surface of the second spacer element.

[0016] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.84≤d0m / f3≤3.96;

[0017] wherein d0m is an inner diameter of the image side end of the lens barrel, and f3 is an effective focal length of the third lens.

[0018] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.50≤(D1s-d1s) / R2≤3.99;

[0019] wherein D1s is an outer diameter of the object side surface of the first spacer element, d1s is an inner diameter of the object side surface of the first spacer element, and R2 is a curvature radius of the image side surface of the first lens.

[0020] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.17≤CT2 / EP12≤1.84.

[0021] wherein CT2 is a central thickness of the second lens on the optical axis, and EP12 is a distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis.

[0022] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 2.22≤d0s / d1s≤4.31.

[0023] wherein d0s is an inner diameter of the object side end of the lens barrel, and d1s is an inner diameter of the object side surface of the first spacer element.

[0024] According to one of the technical solutions of the present application, the optical imaging lens satisfies: -0.38≤(d2s+d2m) / R4≤0.59.

[0025] wherein d2s is an inner diameter of the object side surface of the second spacer element, d2m is an inner diameter of the image side surface of the second spacer element, and R4 is a curvature radius of the image side surface of the second lens.

[0026] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 3.16≤ImgH / (D0m-d0m)≤4.35.

[0027] wherein ImgH is half of the diagonal length of an effective pixel area on an imaging surface of the optical imaging lens, D0m is an outer diameter of the image side end of the lens barrel, and d0m is an inner diameter of the image side end of the lens barrel.

[0028] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.57≤L / (EP01+EP12)≤2.34.

[0029] wherein L is a maximum length of the lens barrel along the direction of the optical axis, EP01 is a spacer distance from the object side end of the lens barrel to the object side surface of the first spacer element along the optical axis, and EP12 is a distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis.

[0030] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 5.05≤EP12*V2 / f23≤6.84.

[0031] Wherein, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction, V2 is the Abbe number of the second lens, and f23 is the combined focal length of the second lens and the third lens.

[0032] According to one of the technical solutions of the present application, the optical imaging lens satisfies: -1.00≤d2m / R5*N3≤0.08.

[0033] Wherein, d2m is the inner diameter of the image side surface of the second spacer element, R5 is the curvature radius of the object side surface of the third lens, and N3 is the refractive index of the third lens.

[0034] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.07≤f / EP01≤2.30.

[0035] Wherein, f is the effective focal length of the optical imaging lens, and EP01 is the interval distance from the object side end of the lens barrel to the object side surface of the first spacer element in the direction along the optical axis.

[0036] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 0.89≤(R2+R3) / d1m≤4.20.

[0037] Wherein, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, and d1m is the inner diameter of the image side surface of the first spacer element.

[0038] The optical imaging lens of the present application is a wide-angle lens composed of three lenses. By reasonably setting the optical lens, half of the maximum field angle of view of the lens satisfies: 66.89°≤HFOV≤82.73°. The outer diameter D0m of the image side end of the lens barrel, the on-axis distance TD from the object side surface of the first lens to the image side surface of the last lens, and the aperture number FNO of the optical system satisfy: 5.63≤D0m / TD*Fno≤7.04, which constrains the overall size of the optical lens to ensure the miniaturization of the wide-angle lens. In the design of the miniaturized wide-angle optical lens, the wide-angle lens has a wide shooting range and a large field angle of view, and the incident light is easy to be reflected at the mechanism position of the middle lens, causing the problem of stray light. In order to solve this problem, the present application constrains |f12| / (D2m-d2m) within a reasonable range, which is conducive to the shielding of the reflected outgoing light of the second lens by the second spacer element, reduces the entry of edge light into the third lens, effectively improves the problem of stray light, and improves the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative work on the basis of these drawings.

[0040] Figure 1 The structural arrangement diagram and the schematic diagram of partial parameters of an optical imaging lens according to the present application are shown;

[0041] Figure 2A 、 Figure 2B and Figure 2C The structural schematic diagrams of three optical imaging lenses according to the first embodiment of the present application are shown;

[0042] Figure 3A 、 Figure 3B 、 Figure 3C and Figure 3D The magnification chromatic aberration curve, the on-axis chromatic aberration curve and the astigmatism curve, the distortion curve of the optical imaging lens according to the first embodiment of the present application are shown respectively;

[0043] Figure 4A 、 Figure 4B and Figure 4C The structural schematic diagrams of three optical imaging lenses according to the second embodiment of the present application are shown;

[0044] Figure 5A 、 Figure 5B 、 Figure 5C and Figure 5D The magnification chromatic aberration curve, the on-axis chromatic aberration curve and the astigmatism curve, the distortion curve of the optical imaging lens according to the second embodiment of the present application are shown respectively;

[0045] Figure 6A 、 Figure 6B and Figure 6C The structural schematic diagrams of three optical imaging lenses according to the third embodiment of the present application are shown;

[0046] Figure 7A 、 Figure 7B 、 Figure 7C and Figure 7D The magnification chromatic aberration curve, the on-axis chromatic aberration curve and the astigmatism curve, the distortion curve of the optical imaging lens according to the third embodiment of the present application are shown respectively;

[0047] Figure 8A and Figure 8B The optical path diagram and the spot diagram of the optical imaging lens satisfying HFOV=80°, D0m / TD*Fno=6, |f12| / (D2m-d2m)=4 are shown;

[0048] Figure 9A and Figure 9B An optical path diagram and a spot diagram are shown when the optical imaging lens satisfies: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 0.5;

[0049] Figure 10A and Figure 10B An optical path diagram and a spot diagram are shown when the optical imaging lens satisfies: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 1.5;

[0050] Figure 11A and Figure 11B An optical path diagram and a spot diagram are shown when the optical imaging lens satisfies: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 2.5. DETAILED DESCRIPTION

[0051] For a better understanding of the present application, various aspects of the application will now be described in more detail. It is to be understood that these detailed descriptions are merely descriptive of exemplary embodiments of the application and are not intended in any way to limit the scope of the application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0052] It is noted that, in this specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be called the second lens or the third lens, without departing from the teachings of the present application.

[0053] In the drawings, the thickness, size, and shape of lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0054] In this context, 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 convexity or concavity of the surface in the paraxial region can be judged according to the positive or negative of the R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens data in the optical software). In terms of the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; in terms of the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. The object side surface of the spacer element refers to the surface of the spacer element located at the most object side and perpendicular to the optical axis, the image side surface of the spacer element refers to the surface of the spacer element located at the most image side and perpendicular to the optical axis, the object side end surface of the lens barrel refers to the surface of the lens barrel located at the most object side and perpendicular to the optical axis, and the image side end surface of the lens barrel refers to the surface of the lens barrel located at the most image side and perpendicular to the optical axis.

[0055] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Furthermore, the word "exemplary" is intended to mean an example or an illustration.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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 the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0057] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The following embodiments only express several implementation manners of the present application, which are described in detail and specifically, but should not be understood as limitations to the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

[0058] As Figure 1As shown, according to the first aspect of the present application, an optical imaging lens group is provided, which comprises three lenses, a first lens with negative focal power, both the object side surface and the image side surface of which are concave; a second lens with positive focal power, the object side surface of which is convex; and a third lens with positive focal power, the image side surface of which is convex.

[0059] The first to third lenses are arranged in sequence along the optical axis from the object side to the image side, each lens has at least one object side surface facing the object side and one image side surface facing the image side, and there is an air gap between adjacent lenses.

[0060] The plurality of spacing elements at least includes: a first spacing element located between the first lens and the second lens and at least partially abutting against the image side surface of the first lens; and a second spacing element located between the second lens and the third lens and at least partially abutting against the image side surface of the second lens.

[0061] The imaging lens group and the plurality of spacing elements are accommodated in a lens barrel, the lens barrel includes an object side end surface, an image side end surface, an outer annular surface and an inner annular surface, and the inner annular surface of the lens barrel is stepped along the optical axis of the optical imaging lens.

[0062] By reasonably distributing the focal power of each lens and the combination of convex and concave surfaces, on the one hand, chromatic aberration and spherical aberration can be effectively reduced, and the color accuracy and clarity of the image can be improved; on the other hand, the focal length and the depth of field can be controlled to achieve a good background blur effect; at the same time, the distribution of light is optimized, optical distortion is reduced, and the uniformity and brightness of the image are improved; in addition, the sharpness, contrast and color saturation of the image are also improved, and a high-quality imaging effect is achieved.

[0063] In some embodiments of the present application, the optical imaging lens can further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive elements located on the image plane.

[0064] In some embodiments of the present application, the optical imaging lens satisfies: 66.89°≤HFOV≤82.73°; 5.63≤D0m / TD*Fno≤7.04; 0.94≤|f12| / (D2m-d2m)≤3.54; wherein HFOV is half of the maximum field of view angle of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, TD is the on-axis distance from the object side surface of the first lens to the image side surface of the third lens; Fno is the aperture number of the optical imaging lens, f12 is the combined focal length of the first lens and the second lens, D2m is the outer diameter of the image side surface of the second spacing element, and d2m is the inner diameter of the image side surface of the second spacing element.

[0065] The application is a wide-angle lens composed of three lenses. By reasonably setting the optical lens, half of the maximum field of view angle of the lens satisfies 66.89°≤HFOV≤82.73°; the outer diameter D0m of the image side end of the lens barrel, the axial distance TD from the object side surface of the first lens to the image side surface of the last lens, and the aperture number FNO of the optical system satisfy 5.63≤D0m / TD*Fno≤7.04, thereby restricting the overall size of the optical lens to ensure the miniaturization of the wide-angle lens. In the design of the miniaturized wide-angle lens, the wide-angle lens has a wide shooting range and a large field of view angle, and the incident light is easy to be reflected at the mechanism position of the middle lens, thereby causing the problem of stray light. In order to solve the problem, |f12| / (D2m-d2m) is constrained within a reasonable range, which is conducive to the shielding of the second lens by the second spacer element to the reflected outgoing light, reduces the edge light entering the third lens, effectively improves the problem of stray light, and improves the imaging quality.

[0066] For example, when HFOV=80° and D0m / TD*Fno=6, the above relationship is satisfied. When |f12| / (D2m-d2m)=4 is set, the upper limit of the range is exceeded, as shown in Figure 8A and Figure 8B , the stray light is serious; when |f12| / (D2m-d2m)=0.5 is set, the lower limit of the range is exceeded, as shown in Figure 9A and Figure 9B , the stray light is serious; when |f12| / (D2m-d2m)=1.5 is set, the above relationship is satisfied, as shown in Figure 10A and Figure 10B , the stray light is slight; when |f12| / (D2m-d2m)=2.5 is set, the above relationship is satisfied, as shown in Figure 11A and Figure 11B , the stray light is slight.

[0067] In some embodiments of the application, the optical imaging lens satisfies 0.99≤EP01 / (CT1+T12)≤1.69; wherein EP01 is the interval distance of the object side end of the lens barrel to the object side surface of the first spacer element in the direction along the optical axis, CT1 is the center thickness of the first lens in the optical axis, and T12 is the air interval of the first lens and the second lens in the optical axis.

[0068] By controlling the distance of the object side end of the lens barrel to the object side surface of the first spacer element in the optical axis, the size of the object side thickness of the lens barrel and the mechanism edge thickness of the first lens can be limited, which is conducive to the design of the lens forming gate and the forming filling of the lens barrel. Then, by controlling the center thickness of the first lens in the optical axis, the overall thickness of the first lens can be controlled, and the thickness ratio can be controlled, which is conducive to injection molding.

[0069] In some embodiments of the present application, the optical imaging lens satisfies: 0.64≤d1m / d2s≤2.08; wherein d1m is the inner diameter of the image side surface of the first spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.

[0070] By controlling the inner diameter of the image side surface of the first spacer element and the inner diameter of the object side surface of the second spacer element, the light rays passing through the edge positions of the image side effective surface and the object side effective surface of the second lens can be constrained, on the one hand, to block part of the non-effective light from entering the second lens structure to generate stray light, and on the other hand, to block the exiting light reflected by the second lens structure, thereby reducing the risk of stray light and improving the picture quality.

[0071] In some embodiments of the present application, the optical imaging lens satisfies: 1.84≤d0m / f3≤3.96; wherein d0m is the inner diameter of the image side end of the lens barrel, and f3 is the effective focal length of the third lens.

[0072] By controlling the effective focal length of the third lens, the face trend of the third lens can be controlled to ensure the angle of the chief ray incident angle, and by controlling the inner diameter of the image side end of the lens barrel, the distance of the edge chief ray can be adjusted to ensure that the light is not blocked.

[0073] In some embodiments of the present application, the optical imaging lens satisfies: 1.17≤CT2 / EP12≤1.84; wherein CT2 is the center thickness of the second lens on the optical axis, and EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction.

[0074] By this condition, the distance from the first spacer element to the second spacer element along the optical axis direction is controlled, which can control the edge thickness of the second lens and is beneficial to the processing and molding of the lens; the second lens is thick in the middle and thin at the edge, and by controlling the center thickness of the second lens, the thickness ratio of the second lens can be controlled within a suitable range, thereby reducing the risk of appearance joint line and stray light and improving the appearance and imaging quality.

[0075] In some embodiments of the present application, the optical imaging lens satisfies: 2.22≤d0s / d1s≤4.31; wherein d0s is the inner diameter of the object side end of the lens barrel, and d1s is the inner diameter of the object side surface of the first spacer element.

[0076] By controlling the inner diameter of the object side surface of the lens barrel, it is ensured that the incident light entering the lens is not blocked, thereby ensuring the optical FOV value; and by controlling the inner diameter of the object side surface of the first spacer element, the non-effective light of the optical system can be blocked and intercepted to prevent entering the second and third lenses, thereby reducing the stray light and being more beneficial to the imaging of the lens.

[0077] In some embodiments of the present application, the optical imaging lens satisfies: -0.38≤(d2s+d2m) / R4≤0.59; wherein d2s is the inner diameter of the object side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element; and R4 is the radius of curvature of the image side surface of the second lens.

[0078] By controlling the inner diameters of the object side surface and the image side surface of the second spacer element, the angle of the chamfered bevel of the inner hole of the second spacer element can be adjusted, the angle of the reflected stray light can be changed, the reflected light can not enter the image plane, and the picture quality can be ensured. By controlling the radius of curvature of the image side surface of the second lens, it can be ensured that the effective edge does not interfere with the inner hole of the second spacer element.

[0079] In some embodiments of the present application, the optical imaging lens satisfies: 3.16≤ImgH / (D0m-d0m)≤4.35; wherein ImgH is half of the diagonal line length of the effective pixel area on the imaging plane of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, and d0m is the inner diameter of the image side end of the lens barrel.

[0080] By controlling the inner diameter of the image side end of the lens barrel, it can be ensured that the effective area of the imaging plane is not blocked to ensure the optical main value. By controlling the difference between the outer diameter and the inner diameter of the image side of the lens barrel, i.e., the thickness of the rear end, it can be ensured that the lens barrel meets the size requirements for machining and MTF testing.

[0081] In some embodiments of the present application, the optical imaging lens satisfies: 1.57≤L / (EP01+EP12)≤2.34; wherein L is the maximum height of the optical imaging lens, EP01 is the interval distance between the object side end of the lens barrel and the object side surface of the first spacer element in the direction along the optical axis, and EP12 is the distance between the image side surface of the first spacer element and the object side surface of the second spacer element in the direction along the optical axis.

[0082] By controlling the above condition formula, the ratio of the maximum height of the lens barrel to the interval distance between the object side end of the lens barrel and the object side surface of the first spacer element and the distance between the first spacer element and the second spacer element can be controlled, so that the miniaturization requirement of the lens can be met.

[0083] In some embodiments of the present application, the optical imaging lens satisfies: 5.05≤EP12*V2 / f23≤6.84; wherein EP12 is the distance between the image side surface of the first spacer element and the object side surface of the second spacer element in the direction along the optical axis, V2 is the Abbe number of the second lens, and f23 is the combined focal length of the second lens and the third lens.

[0084] The Abbe number of the lens determines the size of the refractive index of the lens. By controlling the ratio of the combined focal length of the second lens and the third lens to the Abbe number of the second lens, the trend and direction of the light between the second lens and the third lens can be controlled, the sensitivity of the lens can be reduced, and the distance between the first spacing element and the second spacing element on the optical axis can be controlled to ensure the edge thickness of the second lens and the processability.

[0085] In some embodiments of the application, the optical imaging lens satisfies: -1.00≤d2m / R5*N3≤0.08; wherein d2m is the inner diameter of the image side surface of the second spacing element, R5 is the curvature radius of the object side surface of the third lens, and N3 is the refractive index of the third lens.

[0086] By controlling the refractive index and the curvature radius of the object side surface of the third lens, the transmission of the light according to the set position and direction can be controlled to ensure the optical stability, and by controlling the inner diameter of the image side surface of the second spacing element, the light before the second lens can be converged to ensure the optical Fno.

[0087] In some embodiments of the application, the optical imaging lens satisfies: 1.07≤f / EP01≤2.30; wherein f is the effective focal length of the optical imaging lens, and EP01 is the interval distance between the object side end of the lens barrel and the object side surface of the first spacing element in the direction along the optical axis.

[0088] By controlling the interval distance between the object side end of the lens barrel and the object side surface of the first spacing element in the direction along the optical axis, the distance from the lens image surface to the object side surface of the lens barrel can be controlled to ensure that the light with a large field angle is normally transmitted to the inside of the optical surface without being blocked and interfered, and by controlling the effective focal length of the optical imaging system, the total height of the lens can be directly controlled to ensure the miniaturization of the lens and reduce the space occupation in the whole machine.

[0089] In some embodiments of the application, the optical imaging lens satisfies: 1.50≤(D1s-d1s) / R2≤3.99; wherein D1s is the outer diameter of the object side surface of the first spacing element, and d1s is the inner diameter of the object side surface of the first spacing element.

[0090] By controlling the outer diameter and the inner diameter of the object side surface of the first spacing element, the reflected stray light in the structure of the first lens and the stray light at the edge of the first lens can be shielded to avoid entering the second lens, and by controlling the curvature radius of the image side surface of the first lens, the angle of the light out of the first lens in each field of view can be effectively controlled, which is conducive to the transmission of the light.

[0091] In some embodiments of the application, the optical imaging lens satisfies: 0.89≤(R2+R3) / d1m≤4.20; wherein R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, and d1m is the inner diameter of the image side surface of the first spacing element.

[0092] By controlling the curvature radius of the first lens image side surface and the second lens object side surface, the trend of the surface shape of the two lenses can be directly controlled, and the direction angle of the light rays on the lens surface is controlled to refract, the main optical value parameters are ensured, the inner diameter of the first spacing element is also controlled, and the edge ineffective light rays can be shielded to prevent the generation and transmission of stray light.

[0093] The second aspect of the present application provides such an optical imaging lens. The optical imaging lens can include a lens barrel and an optical lens group and a plurality of spacing elements arranged in the lens barrel. The optical lens group can include a first lens, a second lens and a third lens arranged in order from the object side to the image side along the optical axis, the first lens has a negative focal power, and both the object side surface and the image side surface thereof are concave; the second lens has a positive focal power, and the object side surface thereof is convex; the third lens has a positive focal power, and the image side surface thereof is convex. The plurality of spacing elements can include a first spacing element located between the first lens and the second lens and at least partially abutting against the image side surface of the first lens; and a second spacing element located between the second lens and the third lens and at least partially abutting against the image side surface of the second lens.

[0094] The optical imaging lens satisfies: 1.50≤(D1s-d1s) / R2≤3.99; wherein D1s is the outer diameter of the object side surface of the first spacing element, and d1s is the inner diameter of the object side surface of the first spacing element.

[0095] By controlling the outer diameter and the inner diameter of the object side surface of the first spacing element, the first lens structure internal reflection stray light and the first lens edge stray light can be shielded to avoid entering the second lens; and by controlling the curvature radius of the image side surface of the first lens, the angle of the light rays of each field of view of the first lens can be effectively controlled, which is conducive to the transmission of the light rays.

[0096] The optical imaging lens according to the above-mentioned embodiments of the present application can adopt multiple lenses, for example, three lenses as mentioned above. By reasonably allocating the focal power, surface shape of each lens and the arrangement of each spacing element, etc., the span of each gear of the lens and the lens barrel is relatively uniform, the light converging ability is enhanced, and the imaging quality of the optical imaging lens is improved.

[0097] In some embodiments of the present application, the lens material in the optical imaging lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristics of the glass. The optical lens provided by the present application can adopt a full-plastic lens structure, which not only has excellent imaging performance, but also has a relatively compact structure, and can better achieve the balance between miniaturization and high image quality of the lens.

[0098] In some embodiments of the present application, the first lens, the second lens and the third lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce aberration of an optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the second lens and the third lens of the present application can all adopt an aspherical lens, which can effectively reduce aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and achieving miniaturization of the lens.

[0099] When the lens adopts an aspherical lens, each aspherical surface shape of the optical lens satisfies the following equation:

[0100] In the above formula, is the height perpendicular to the optical axis at the position of the optical axis; is the axial distance from the curved surface to the vertex; represents the curvature at the vertex of the aspherical curved surface; is the conic coefficient; , , , , , , ··· respectively represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, and so on aspherical coefficients.

[0101] The present application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and are all included in the protection scope of the present application.

[0102] Embodiment one

[0103] The optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 according to the first embodiment of the present application are described below with reference to Figures 2A to 3D Figure 2A , Figure 2B and Figure 2C respectively show the structural schematic diagram of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 according to the first embodiment of the present application.

[0104] As shown in Figure 2A , Figure 2B and​Figure 2C As shown, the structural schematic diagrams of optical imaging lenses 1001, 1002, and 1003 all include a lens barrel structure, imaging lens groups E1 to E3, and multiple spacer elements P1 to P2.

[0105] In Embodiment 1, the schematic diagrams of optical imaging lenses 1001, 1002, and 1003 employ the same imaging lens group. The imaging lens group, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, and a third lens E3. The first lens E1 has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with both its object-side surface S5 and image-side surface S6 being convex. Light from the object passes sequentially through surfaces S1 to S6 and is finally imaged onto the imaging surface. In Table 1, S7 and S9 can be the object-side surfaces of filters or protective glass, S8 and S10 can be the image-side surfaces of filters or protective glass, and S11 is the imaging surface (S7, S8, S9, S10, and S11 are as follows). Figure 2A As shown in the figure (other figures omitted), OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located between the second lens and the third lens.

[0106] Table 1 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units for radius of curvature and thickness are millimeters (mm).

[0107]

[0108] Table 1

[0109] Table 2 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0110]

[0111] Table 2

[0112] like Figure 2A , Figure 2B and Figure 2CAs shown, the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 each includes two spacer elements, which are a first spacer element P1 and a second spacer element P2 respectively. The first spacer element P1 is arranged between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, and the second spacer element P2 is arranged between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2. In the embodiment, the first spacer element P1 and the second spacer element P2 are spacers. The above spacer elements P1 and P2 can block the entry of external stray light, make the lens barrel better abut, and enhance the structural stability of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003.

[0113] The optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 can differ in the size of the spacer elements, the lens non-effective diameter region and the lens barrel structure parameters. Table 3 shows the basic parameter table of the spacer elements and the lens barrel of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment One. As an example, the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 each has one lens barrel.

[0114]

[0115] Table 3

[0116] Figure 3A The lateral chromatic aberration curve of the optical imaging lens of Embodiment One is shown, which represents the deviation of the light rays of different image heights after passing through the lens. Figure 3B The on-axis chromatic aberration curve of the optical imaging lens of Embodiment One is shown, which represents the deviation of the converging points of light rays of different wavelengths after passing through the lens. Figure 3C The astigmatism curve of the optical imaging lens of Embodiment One is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 3D The distortion curve of the optical imaging lens of Embodiment One is shown, which represents the distortion size values corresponding to different image heights. According to the Figures 3A to 3D It can be seen that the optical imaging lens given in Embodiment One can achieve good imaging quality.

[0117] Embodiment Two

[0118] The following refers to Figures 4A to 5D The optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 according to Embodiment Two of the present application are described. Figure 4A 、 Figure 4B and Figure 4CSchematic diagrams of the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of this application are shown respectively.

[0119] like Figure 4A , Figure 4B and Figure 4C As shown, the structural schematic diagrams of optical imaging lenses 2001, 2002 and 2003 all include a lens barrel structure, imaging lens groups E1 to E3 and multiple spacer elements P1 to P2.

[0120] In Embodiment 2, the schematic diagrams of optical imaging lenses 2001, 2002, and 2003 employ the same imaging lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, and a third lens E3. The first lens E1 has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens E2 has positive optical power, and both its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has positive optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. Light from the object passes sequentially through surfaces S1 to S6 and is ultimately imaged onto the imaging surface. In Table 4, S7 and S9 (not shown in the figure) can be the object side of the filter or protective glass, S8 and S10 (not shown in the figure) can be the image side of the filter or protective glass, S11 (not shown in the figure) is the imaging plane, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located between the second lens and the third lens.

[0121] Table 4 lists the relevant parameters of each lens in the optical imaging lens of this embodiment. The units for radius of curvature and thickness are millimeters (mm).

[0122]

[0123] Table 4

[0124] Table 5 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0125]

[0126] Table 5

[0127] like Figure 4A , Figure 4B and Figure 4CAs shown, the optical imaging lenses 2001, 2002 and 2003 each includes two spacer elements, which are the first spacer element P1 and the second spacer element P2, respectively. Since the positions of the above two spacer elements are the same as those of the spacer elements of the optical imaging lenses 1001, 1002 and 1003 of Embodiment One, no further description is provided herein.

[0128] The optical imaging lenses 2001, 2002 and 2003 can differ in the size of the spacer elements, the lens non-effective diameter region and the barrel structure parameters. Table 6 shows the basic parameter table of the spacer elements and the barrels of the optical imaging lenses 2001, 2002 and 2003 of Embodiment Two. As an example, the optical imaging lenses 2001, 2002 and 2003 each has one barrel.

[0129]

[0130] Table 6

[0131] Figure 5A The lateral chromatic aberration curves of the optical imaging lenses of Embodiment Two are shown, which represent the deviation of the light rays of different image heights via the lenses. Figure 5B The on-axis chromatic aberration curves of the optical imaging lenses of Embodiment Two are shown, which represent the deviation of the converging focal points of light rays of different wavelengths via the lenses. Figure 5C The astigmatism curves of the optical imaging lenses of Embodiment Two are shown, which represent the meridional image surface curvature and the sagittal image surface curvature. Figure 5D The distortion curves of the optical imaging lenses of Embodiment Two are shown, which represent the distortion size values corresponding to different image heights. According to the distortion curves, the optical imaging lenses of Embodiment Two can achieve good imaging quality. Figures 5A to 5D It can be known that the optical imaging lenses given in Embodiment Two can achieve good imaging quality.

[0132] Embodiment Three

[0133] The following refers to Figures 6A to 7D The optical imaging lenses 3001, 3002 and 3003 according to Embodiment Three of the present application are described. Figure 6A , Figure 6B and Figure 6C The structural schematic diagrams of the optical imaging lenses 3001, 3002 and 3003 according to Embodiment Three of the present application are shown, respectively.

[0134] As Figure 6A , Figure 6B and Figure 6CAs shown, the structural schematic diagrams of optical imaging lenses 3001, 3002, and 3003 all include a lens barrel structure, imaging lens groups E1 to E3, and multiple spacer elements P1 to P2.

[0135] In Embodiment 3, the schematic diagrams of optical imaging lenses 3001, 3002, and 3003 employ the same imaging lens group. The imaging lens group, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, and a third lens E3. The first lens E1 has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens E2 has positive optical power, and both its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. Light from the object passes sequentially through surfaces S1 to S6 and is ultimately imaged onto the imaging surface. In Table 7, S7 and S9 (not shown in the figure) can be the object side of the filter or protective glass, S8 and S10 (not shown in the figure) can be the image side of the filter or protective glass, S11 (not shown in the figure) is the imaging plane, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located between the first lens and the second lens.

[0136] Table 7 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units for radius of curvature and thickness are millimeters (mm).

[0137]

[0138] Table 7

[0139] Table 8 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0140]

[0141] Table 8

[0142] like Figure 6A , Figure 6B and Figure 6CAs shown, the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 each includes two spacer elements, which are the first spacer element P1 and the second spacer element P2, respectively. Since the positions of the above two spacer elements are the same as those of the spacer elements of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment One, no further elaboration is made.

[0143] The optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 can differ in the size of the spacer elements, the lens non-effective diameter region and the barrel structure parameters. Table 9 shows the basic parameter table of the spacer elements and the barrel of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 of Embodiment Three. As an example, the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 each has one barrel.

[0144]

[0145] Table 9

[0146] Figure 7A The lateral chromatic aberration curves of the optical imaging lens of Embodiment Three are shown, which represent the deviation of light rays of different image heights via the lens on the imaging plane. Figure 7B The on-axis chromatic aberration curves of the optical imaging lens of Embodiment Three are shown, which represent the deviation of converging focal points of light rays of different wavelengths via the lens. Figure 7C The astigmatism curves of the optical imaging lens of Embodiment Three are shown, which represent the meridional image surface curvature and the sagittal image surface curvature. Figure 7D The distortion curves of the optical imaging lens of Embodiment Three are shown, which represent the distortion size values corresponding to different image heights. According to the Figures 7A to 7D It can be known that the optical imaging lens given in Embodiment Three can achieve good imaging quality.

[0147] In summary, the optical parameters of the optical imaging lens 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Embodiment One to Embodiment Three are shown in Table 10 below.

[0148]

[0149] Table 10

[0150] The optical imaging lens 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Embodiment One to Embodiment Three satisfy the relationships shown in Table 11.

[0151]

[0152] Table 11

[0153] The above description is only preferred embodiments of the present application and the explanation of the technical principles of the application. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens comprising a lens barrel, and an imaging lens group and a plurality of spacer elements disposed in the lens barrel, characterized in that, the imaging lens group comprises, in order from the object side to the image side along the optical axis, a first lens having negative refractive power, a second lens having positive refractive power, and a third lens having positive refractive power; the object side surface and the image side surface of the first lens are both concave; the object side surface of the second lens is convex; and the image side surface of the third lens is convex; the plurality of spacer elements comprises at least a second spacer element located between the second lens and the third lens and at least partially abutting against the image side surface of the second lens; the optical imaging lens satisfies: 66.89° ≤ HFOV ≤ 82.73°; 5.63 ≤ D0m / TD*Fno ≤ 7.04; 0.94 ≤ |f12| / (D2m-d2m) ≤ 3.54; wherein HFOV is half of the maximum field of view angle of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, TD is the on-axis distance from the object side surface of the first lens to the image side surface of the third lens, Fno is the F-number of the optical imaging lens, f12 is the combined focal length of the first lens and the second lens, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element. 2.The optical imaging lens according to claim 1, wherein, the plurality of spacer elements further comprises a first spacer element located between the first lens and the second lens and at least partially abutting against the image side surface of the first lens; the optical imaging lens satisfies: 0.99 ≤ EP01 / (CT1+T12) ≤ 1.69; wherein EP01 is the separation distance in the direction along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, CT1 is the central thickness of the first lens in the optical axis, and T12 is the air separation of the first lens and the second lens in the optical axis. 3.The optical imaging lens according to claim 2, wherein, the optical imaging lens satisfies: 0.64 ≤ d1m / d2s ≤ 2.08; wherein d1m is the inner diameter of the image side surface of the first spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. 4.The optical imaging lens according to claim 2, wherein, the optical imaging lens satisfies: 1.50 ≤ (D1s-d1s) / R2 ≤ 3.99; wherein D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element, and R2 is the radius of curvature of the image side surface of the first lens.

5. The optical imaging lens according to claim 2, characterized in that, the optical imaging lens satisfies: 1.17 ≤ CT2 / EP12 ≤ 1.84; wherein CT2 is the central thickness of the second lens in the optical axis, and EP12 is the distance in the direction along the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element. 6.The optical imaging lens according to claim 2, wherein, the optical imaging lens satisfies: 2.22 ≤ d0s / d1s ≤ 4.31; wherein d0s is the inner diameter of the object side end surface of the lens barrel, and d1s is the inner diameter of the object side surface of the first spacer element. 7.The optical imaging lens according to claim 2, wherein, the optical imaging lens satisfies: 1.57 ≤ L / (EP01+EP12) ≤ 2.34; Wherein, L is the maximum length of the lens barrel along the direction of the optical axis, EP01 is the interval distance of the object side end surface of the lens barrel to the object side surface of the first spacer element in the direction of the optical axis, EP12 is the distance of the image side surface of the first spacer element to the object side surface of the second spacer element in the direction of the optical axis. 8.The optical imaging lens according to claim 2, wherein, The optical imaging lens satisfies: 5.05≤EP12*V2 / f23≤6.84; Wherein, EP12 is the distance of the image side surface of the first spacer element to the object side surface of the second spacer element in the direction of the optical axis, V2 is the Abbe number of the second lens, and f23 is the combined focal length of the second lens and the third lens. 9.The optical imaging lens according to claim 2, wherein, The optical imaging lens satisfies: 1.07≤f / EP01≤2.30; Wherein, f is the effective focal length of the optical imaging lens, and EP01 is the interval distance of the object side end surface of the lens barrel to the object side surface of the first spacer element in the direction of the optical axis. 10.The optical imaging lens according to claim 2, wherein, The optical imaging lens satisfies: 0.89≤(R2+R3) / d1m≤4.20; Wherein, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, and d1m is the inner diameter of the image side surface of the first spacer element.

11. The optical imaging lens according to any of claims 1-10, wherein, The optical imaging lens satisfies: -1.00≤d2m / R5*N3≤0.08; Wherein, d2m is the inner diameter of the image side surface of the second spacer element, R5 is the curvature radius of the object side surface of the third lens, and N3 is the refractive index of the third lens.

12. The optical imaging lens according to any one of claims 1-10, wherein, The optical imaging lens satisfies: 1.84≤d0m / f3≤3.96; Wherein, d0m is the inner diameter of the image side end surface of the lens barrel, and f3 is the effective focal length of the third lens.

13. The optical imaging lens according to any one of claims 1-10, wherein, The optical imaging lens satisfies: -0.38≤(d2s+d2m) / R4≤0.59; Wherein, d2s is the inner diameter of the object side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and R4 is the curvature radius of the image side surface of the second lens.

14. The optical imaging lens according to any of claims 1-10, wherein, The optical imaging lens satisfies: 3.16≤ImgH / (D0m-d0m)≤4.35; Wherein, ImgH is half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging lens, D0m is the outer diameter of the image side end surface of the lens barrel, and d0m is the inner diameter of the image side end surface of the lens barrel.

Images