Optical imaging lens

Abstract

The invention relates to an optical imaging lens, which comprises a lens barrel, and an imaging lens group and a plurality of spacing elements which are arranged in the lens barrel, and is characterized in that the imaging lens group comprises a first lens, a second lens and a third lens; the plurality of spacing elements comprise a first spacing element and a second spacing element; the optical imaging lens meets the following conditions: HFOV is more than or equal to 66.89 degrees and less than or equal to 82.73 degrees; 5.63 < = D0m / TD * Fno < = 7.04; 0.94 < = f12 / (D2m-d2m) < = 3.54; wherein HFOV is half of the maximum field angle of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, and 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 spacing element, and d2m is the inner diameter of the image side surface of the second spacing element. According to the optical imaging lens, the problem of stray light can be effectively solved by constraining the second spacing element, and the optical imaging lens has the advantages of large field angle, slight stray light and the like.

Description

Technical Field

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

[0002] With the development of optical lenses, lenses are gradually moving towards larger image surfaces and wider fields of view. Wide-angle lenses, thanks to their wide coverage and ability to highlight details and layering, are finding increasingly widespread application. Beyond mobile phones, market demand is growing in security, automotive, and drone applications. However, conventional wide-angle lenses, such as those in Chinese invention patent publication number "CN119395860B," disclose an optical imaging lens comprising a lens barrel, an optical lens assembly, and a spacer assembly positioned within the barrel. The optical lens assembly comprises, in order from the object side to the image side of the optical axis, a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power. The first lens has a concave object-side surface and a concave image-side surface; the second lens has a convex image-side surface; and the third lens has a convex object-side surface. The spacer assembly includes a second spacer positioned on the image-side surface of the second lens and in contact with the image-side surface. At wide fields of view, incident light is easily reflected by the intermediate lens element, causing stray light and affecting image quality. Therefore, how to provide an optical imaging lens to reduce stray light at a large field of view has become an urgent problem to be solved. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, an object of the present invention 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 object, the present invention provides an optical imaging lens, comprising a lens barrel, an imaging lens group and a plurality of spacer elements disposed in the lens barrel. The imaging lens group includes, in order from the object side to the image side along the optical axis: a first lens having negative optical power, a second lens having positive optical power, and a third lens having positive optical power; the first lens to the third lens are arranged in order from the object side to the imaging plane side along the optical axis, each lens having at least an object-side surface facing the object side and an image-side surface facing the imaging plane side, the object-side surface and the image-side surface of the first lens are both concave surfaces; the object-side surface of the second lens is a convex surface; the image-side surface of the third lens is a convex surface; and an air gap is provided between adjacent lenses; The plurality of spacer elements include a first spacer element located between the first lens and the second lens and at least partially in contact with 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 in contact with the image side surface of the second lens; The optical imaging lens meets the following requirements: 66.89°≤HFOV≤82.73°; 5.63≤D0m / TD*Fno≤7.04; 0.94≤|f12| / (D2m-d2m)≤3.54; Among them, HFOV is half of the maximum field of view 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 spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

[0005] According to a technical solution of the present invention, the optical imaging lens satisfies: 0.99≤EP01 / (CT1+T12)≤1.69; Among them, EP01 is the spacing distance from the object side end of the lens barrel to the object side surface of the first spacer element along the optical axis, CT1 is the center thickness of the first lens on the optical axis, and T12 is the air spacing between the first lens and the second lens on the optical axis.

[0006] According to a technical solution of the present invention, 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.

[0007] According to a technical solution of the present invention, 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.

[0008] According to a technical solution of the present invention, 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 curvature radius of the image-side surface of the first lens.

[0009] According to a technical solution of the present invention, 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.

[0010] According to a technical solution of the present invention, 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.

[0011] According to a technical solution of the present invention, 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.

[0012] According to a technical solution of the present invention, the optical imaging lens satisfies: 3.16≤ImgH / (D0m-d0m)≤4.35; Among them, ImgH is half of the diagonal 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 of the lens barrel, and d0m is the inner diameter of the image side end of the lens barrel.

[0013] According to a technical solution of the present invention, 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 spacing 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 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.

[0014] According to a technical solution of the present invention, the optical imaging lens satisfies: 5.05≤EP12*V2 / f23≤6.84; 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, V2 is the Abbe number of the second lens, and f23 is the combined focal length of the second lens and the third lens.

[0015] According to a technical solution of the present invention, 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.

[0016] According to a technical solution of the present invention, 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 spacing distance from the object side end of the lens barrel to the object side surface of the first spacing element along the optical axis.

[0017] According to a technical solution of the present invention, 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.

[0018] The optical imaging lens of the present application is a wide-angle lens composed of three lenses. By properly setting the optical lenses, half of the lens' maximum field of view satisfies the following conditions: 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 of the first lens to the image side of the last lens, and the aperture number FNO of the optical system satisfy the following conditions: 5.63≤D0m / TD*Fno≤7.04, constraining the overall size of the optical lens to ensure the miniaturization of the wide-angle lens. In the design of a miniaturized wide-angle optical lens, the wide-angle lens has a wide shooting range and a large field of view. The incident light is easily reflected at the mechanical position of the middle lens, resulting in stray light. To solve this problem, the present application constrains |f12| / (D2m-d2m) within a reasonable range, which is conducive to the second spacer element blocking the outgoing light reflected by the second lens, while reducing the marginal light entering the third lens, effectively improving the stray light problem and enhancing the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0020] Figure 1 A schematic diagram showing the structural arrangement and some parameters of an optical imaging lens according to the present invention is shown; Figure 2A 、 Figure 2B and Figure 2C Schematic diagrams of the structures of three optical imaging lenses according to the first embodiment of the present application are shown; Figure 3A 、 Figure 3B 、 Figure 3C and Figure 3D 1. The magnification chromatic aberration curve, the axial chromatic aberration curve, the astigmatism curve, and the distortion curve of the optical imaging lens according to the first embodiment of the present application are respectively shown; Figure 4A 、 Figure 4B and Figure 4C Schematic diagrams of the structures of three optical imaging lenses according to the second embodiment of the present application are shown; Figure 5A 、 Figure 5B 、 Figure 5C and Figure 5D 1. The magnification chromatic aberration curve, the axial chromatic aberration curve, the astigmatism curve, and the distortion curve of the optical imaging lens according to the second embodiment of the present application are respectively shown; Figure 6A 、 Figure 6B and Figure 6C Schematic diagrams of the structures of three optical imaging lenses according to the third embodiment of the present application are shown; Figure 7A 、 Figure 7B 、 Figure 7C and Figure 7D 1. The magnification chromatic aberration curve, the axial chromatic aberration curve, the astigmatism curve, and the distortion curve of the optical imaging lens according to the third embodiment of the present application are respectively shown; Figure 8A and Figure 8B The optical path diagram and spot diagram are shown when the optical imaging lens meets the following conditions: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 4; Figure 9A and Figure 9B The optical path diagram and spot diagram are shown when the optical imaging lens meets the following conditions: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 0.5; Figure 10A and Figure 10B The optical path diagram and spot diagram are shown when the optical imaging lens meets the following conditions: HFOV = 80°, D0m / TD*Fno = 6, |f12| / (D2m-d2m) = 1.5; Figure 11A and Figure 11B The optical path diagram and spot diagram are shown when the optical imaging lens meets the following conditions: HFOV=80°, D0m / TD*Fno=6, |f12| / (D2m-d2m)=2.5. DETAILED DESCRIPTION

[0021] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to 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.

[0022] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0023] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0024] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it indicates that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it indicates that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined by the positive or negative R value (R refers to the radius of curvature of the paraxial region, typically the R value in the lens database in optical software). For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface. For the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface. The object-side surface of the spacer element refers to the surface of the spacer element that is located most on the object side and perpendicular to the optical axis. The image-side surface of the spacer element refers to the surface of the spacer element that is located most on the 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 that is located most on the object side and perpendicular to the optical axis. The image-side end surface of the lens barrel refers to the surface of the lens barrel that is located most on the image side and perpendicular to the optical axis.

[0025] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0026] 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 commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following examples only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be understood as limiting the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application.

[0028] like Figure 1 According to a first aspect of the present invention, an optical imaging lens assembly is provided, comprising three lenses: a first lens having negative optical power, whose object-side surface and image-side surface are both concave; a second lens having positive optical power, whose object-side surface is convex; and a third lens having positive optical power, whose image-side surface is convex. The first to third lenses are arranged in sequence along the optical axis from the object side to the imaging surface side. Each lens has at least an object-side surface facing the object side and an image-side surface facing the imaging surface side. There is an air gap between adjacent lenses.

[0029] The plurality of spacer elements include at least: a first spacer element located between the first lens and the second lens, at least partially supporting the image side surface of the first lens; a second spacer element located between the second lens and the third lens, at least partially supporting the image side surface of the second lens.

[0030] The imaging lens group and multiple spacer elements are accommodated in the lens barrel. The lens barrel includes an object side end face, an image side end face, an outer annular surface and an inner annular surface. Along the optical axis direction of the optical imaging lens, the inner annular surface of the lens barrel is stepped.

[0031] By rationally allocating the optical 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 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 improved to achieve high-quality imaging effects.

[0032] In some embodiments of the present invention, the optical imaging lens may further include a color filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0033] In some embodiments of the present invention, the optical imaging lens satisfies the following conditions: 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 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 element to the image-side surface of the third lens element; Fno is the aperture number of the optical imaging lens, f12 is the combined focal length of the first lens element and the second lens element, 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.

[0034] The present application is a wide-angle lens composed of three lenses. By properly setting the optical lenses, half of the lens's maximum field of view satisfies the following conditions: 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 of the first lens to the image side of the last lens, and the aperture number FNO of the optical system satisfy the following conditions: 5.63≤D0m / TD*Fno≤7.04. This constrains the overall size of the optical lens to ensure the miniaturization of the wide-angle lens. In the design of a miniaturized wide-angle lens, the wide-angle lens has a wide shooting range and a large field of view. Incident light is easily reflected at the structural position of the middle lens, causing stray light. To solve this problem, the present application constrains |f12| / (D2m-d2m) within a reasonable range, which facilitates the second spacer element to block the outgoing light reflected by the second lens, while reducing the marginal light from entering the third lens, effectively improving the stray light problem and enhancing the imaging quality.

[0035] For example, when HFOV=80° and D0m / TD*Fno=6, the above relationship is satisfied. At this time, setting |f12| / (D2m-d2m)=4 exceeds the upper limit of the range, such as Figure 8A and Figure 8B As shown in the figure, the stray light is serious; when setting |f12| / (D2m-d2m)=0.5, it exceeds the lower limit of the range, such as Figure 9A and Figure 9B As shown, the stray light is serious; setting |f12| / (D2m-d2m)=1.5 satisfies the above relationship, as shown in Figure 10A and Figure 10B As shown, the stray light is slight; setting |f12| / (D2m-d2m)=2.5 satisfies the above relationship, as shown in Figure 11A and Figure 11B As shown, the stray light is slight.

[0036] In some embodiments of the present invention, the optical imaging lens satisfies the following: 0.99≤EP01 / (CT1+T12)≤1.69; wherein EP01 is the distance along the optical axis between the object-side end of the lens barrel and the object-side surface of the first spacer element, CT1 is the center thickness of the first lens element on the optical axis, and T12 is the air spacing between the first lens element and the second lens element on the optical axis.

[0037] By controlling the distance on the optical axis from the object side end of the lens barrel to the object side surface of the first spacer element, the object side thickness of the lens barrel and the side thickness of the first lens structure can be limited, which is beneficial to the design of the lens molding gate and the molding and filling of the lens barrel. By controlling the center thickness of the first lens on the optical axis, the overall thickness of the first lens can be controlled, and the thickness ratio can be controlled, which is beneficial to injection molding.

[0038] In some embodiments of the present invention, 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.

[0039] 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 passing through the edge of the image-side effective surface and the object-side effective surface of the second lens can be constrained. On the one hand, some ineffective light can be blocked from entering the second lens structure and reflecting to generate stray light. On the other hand, the outgoing light reflected by the second lens structure can be blocked, reducing the risk of stray light and improving image quality.

[0040] In some embodiments of the present invention, 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.

[0041] By controlling the effective focal length of the third lens, the surface trend of the third lens can be controlled to ensure the angle of incidence of the main light. At the same time, by controlling the inner diameter of the image side end of the lens barrel, the distance from the edge of the main light can be adjusted to ensure that the light is not blocked.

[0042] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: 1.17≤CT2 / EP12≤1.84; wherein CT2 is the center thickness of the second lens element 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.

[0043] By controlling the distance from the first spacer element to the second spacer element along the optical axis through this conditional expression, the edge thickness of the second lens can be controlled, which is beneficial for lens processing and molding. The second lens is thick in the middle and thin at the edges. By controlling the center thickness of the second lens, the thickness ratio of the second lens can be controlled within an appropriate range, reducing the risk of weld lines and stray light in the molding appearance, and improving the appearance and imaging quality.

[0044] In some embodiments of the present invention, 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.

[0045] By controlling the inner diameter of the object side of the lens barrel, the incident light entering the lens is not blocked, thereby ensuring the optical FOV value; by controlling the inner diameter of the object side of the first spacer element, invalid light from the optical system can be blocked and intercepted to prevent it from entering the second and third lenses, reducing stray light and being more conducive to lens imaging.

[0046] In some embodiments of the present invention, the optical imaging lens satisfies the following: -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 element.

[0047] By controlling the inner diameters of the object-side and image-side surfaces of the second spacer element, the chamfer angle of the second spacer element's inner aperture can be adjusted, changing the angle of stray light reflection to prevent reflected light from entering the image plane, thereby ensuring image quality. Simultaneously, controlling the curvature radius of the image-side surface of the second lens ensures that the effective diameter edge does not interfere with the inner aperture of the second spacer element.

[0048] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: 3.16≤ImgH / (D0m-d0m)≤4.35; wherein ImgH is half the diagonal 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.

[0049] By controlling the inner diameter of the image-side end of the lens barrel, the effective area of ​​the imaging surface can be ensured not to be blocked, thereby guaranteeing the optical principal value. By controlling the difference between the image-side outer diameter and the inner diameter of the lens barrel, that is, the thickness of the rear end, the requirements for the supporting dimensions during the processing and forming of the lens barrel and the MTF test can be guaranteed.

[0050] In some embodiments of the present invention, the optical imaging lens satisfies the following: 1.57≤L / (EP01+EP12)≤2.34; where L is the maximum height of the optical imaging lens, EP01 is the distance along the optical axis from the object-side end of the lens barrel to the object-side surface of the first spacer element, and EP12 is the distance along the optical axis from the image-side surface of the first spacer element to the object-side surface of the second spacer element.

[0051] By controlling the above conditional expressions, the ratio of the maximum height of the lens barrel to the distance between the object side end of the lens barrel and the object side of the first spacing element and the distance between the first spacing element and the second spacing element can be controlled to meet the requirements of miniaturization of the lens.

[0052] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: 5.05≤EP12*V2 / f23≤6.84; 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, V2 is the Abbe number of the second lens element, and f23 is the combined focal length of the second lens element and the third lens element.

[0053] The Abbe number of a lens determines its refractive index. By controlling the ratio of the combined focal length of the second and third lenses to the Abbe number of the second lens, the trend and direction of light between the second and third lenses can be controlled, reducing the sensitivity of the lens. At the same time, controlling the distance from the first spacer element to the second spacer element on the optical axis can ensure the edge thickness of the second lens and ensure processability.

[0054] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: -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 radius of curvature of the object-side surface of the third lens element, and N3 is the refractive index of the third lens element.

[0055] By controlling the refractive index of the third lens and the curvature radius of the object side, the light can be controlled to transmit in the set direction and position to ensure optical stability. At the same time, by controlling the inner diameter of the image side of the second spacer element, the light in front of the second lens can be converged to ensure the optical Fno.

[0056] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: 1.07≤f / EP01≤2.30; wherein f is the effective focal length of the optical imaging lens, and EP01 is the distance between the object-side end of the lens barrel and the object-side surface of the first spacer element along the optical axis.

[0057] By controlling the 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 plane to the object side surface of the lens barrel can be controlled, ensuring that light with a large field of view is normally transmitted to the interior of the optical surface without being blocked or interfered with. At the same time, by controlling the effective focal length of the optical imaging system, the total height of the lens can be directly controlled, ensuring the miniaturization of the lens and reducing the space occupied by the entire device.

[0058] In some embodiments of the present invention, 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, and d1s is the inner diameter of the object-side surface of the first spacer element.

[0059] By controlling the outer and inner diameters of the object side of the first spacer element, stray light reflected from within the first lens structure and from the edge of the first lens can be blocked to prevent it from entering the second lens. At the same time, controlling the curvature radius of the image side of the first lens can effectively control the angle of the light emitted from each field of view of the first lens, which is beneficial to the transmission of light.

[0060] In some embodiments of the present invention, the optical imaging lens satisfies the following condition: 0.89≤(R2+R3) / d1m≤4.20; wherein R2 is the radius of curvature of the image-side surface of the first lens element, R3 is the radius of curvature of the object-side surface of the second lens element, and d1m is the inner diameter of the image-side surface of the first spacer element.

[0061] By controlling the curvature radius of the image side surface of the first lens and the object side surface of the second lens, the surface trends of the two lenses can be directly controlled, thereby controlling the refraction of light in a set direction and angle on the lens surface to ensure the optical main value parameters. At the same time, controlling the inner diameter of the first spacer element can also block invalid edge light and prevent the generation and transmission of stray light.

[0062] The second aspect of the present application provides an optical photography lens. The optical photography lens may include a lens barrel, an optical lens group and a plurality of spacer elements disposed in the lens barrel. The optical lens group may include a first lens, a second lens and a third lens arranged in sequence from the object side to the image side along the optical axis, the first lens having negative optical power, and its object side surface and image side surface are both concave; the second lens having positive optical power, and its object side surface is convex; the third lens having positive optical power, and its image side surface is convex. The plurality of spacer elements may include a first spacer element located between the first lens and the second lens, at least partially resting on the image side surface of the first lens; and a second spacer element located between the second lens and the third lens, at least partially resting on the image side surface of the second lens.

[0063] 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, and d1s is the inner diameter of the object-side surface of the first spacer element.

[0064] By controlling the outer and inner diameters of the object side of the first spacer element, stray light reflected from within the first lens structure and from the edge of the first lens can be blocked to prevent it from entering the second lens. At the same time, controlling the curvature radius of the image side of the first lens can effectively control the angle of the light emitted from each field of view of the first lens, which is beneficial to the transmission of light.

[0065] The optical imaging lens according to the above-described embodiment of the present application can utilize multiple lenses, such as the three lenses described above. By rationally allocating the optical power, surface shape, and arrangement of the spacer elements of each lens, the span of each position of the lens and lens barrel can be made uniform, thereby enhancing the light convergence capability and improving the imaging quality of the optical imaging lens.

[0066] In some embodiments of the present invention, the lens material of the optical imaging lens provided herein can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Alternatively, when the lens material is glass, the inherent low dispersion of glass can be used to effectively correct the geometric chromatic aberration of the optical system. The optical lens provided herein can utilize an all-plastic lens structure, which not only provides excellent imaging performance but also makes the lens structure more compact, effectively achieving a balance between miniaturization and high image quality.

[0067] In some embodiments of the present invention, the first, second, and third lenses may be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number and size of lenses, and better achieving lens miniaturization. More specifically, the first, second, and third lenses of the present invention may all be aspherical lenses, which can effectively reduce the aberrations of the optical lens, thereby reducing the number and size of lenses, and achieving lens miniaturization.

[0068] When the lens adopts an aspheric lens, the shapes of the aspheric surfaces of the optical lens satisfy the following equations:

[0069] In the above formula, is along the optical axis, and the height perpendicular to the optical axis is The axial distance from the surface to the vertex at the position; represents the curvature at the vertex of the aspheric surface; is the cone coefficient; 、 、 、 、 、 、 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0070] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0071] Example 1 The following reference Figures 2A to 3D An optical imaging lens 1001 , an optical imaging lens 1002 , and an optical imaging lens 1003 according to a first embodiment of the present application are described. Figure 2A 、 Figure 2B and Figure 2C Schematic diagrams of the structures of an optical imaging lens 1001, an optical imaging lens 1002, and an optical imaging lens 1003 according to the first embodiment of the present application are respectively shown.

[0072] like Figure 2A 、 Figure 2B and Figure 2C As shown, the structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 all include a lens barrel structure, imaging lens groups E1 to E3 and a plurality of spacer elements P1 to P2.

[0073] In Example 1, the structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 use the same imaging lens group, and the imaging lens group includes, from the object side to the image side, a first lens E1, a second lens E2 and a third lens E3. Among them, the first lens E1 has negative optical focal length, and its object side surface S1 and image side surface S2 are both concave surfaces. The second lens E2 has positive optical focal length, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical focal length, and its object side surface S5 and image side surface S6 are both convex surfaces. The light from the object passes through each surface S1 to S6 in sequence and is finally imaged on the imaging surface. S7 and S9 in Table 1 can be the object side surfaces of the filter or protective glass, S8 and S10 can be the image side surfaces of the filter or protective glass, and S11 is the imaging surface (S7, S8, S9, S10, S11 are as follows): Figure 2A As shown in the figure, the other figures are omitted), OBJ (not shown in the figure) is the object distance, STO (not shown in the figure) is the aperture, and the aperture is located between the second lens and the third lens.

[0074] Table 1 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units of curvature radius and thickness are both millimeters.

[0075]

[0076] Table 1 Table 2 lists the aspheric coefficients of the aspheric lenses of the zoom lens of this embodiment, including: A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0077]

[0078] Table 2 like Figure 2A 、 Figure 2B and Figure 2C As shown, optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003 each include two spacer elements: a first spacer element P1 and a second spacer element P2. The first spacer element P1 is disposed between the first lens element E1 and the second lens element E2 and contacts the image-side surface of the first lens E1. The second spacer element P2 is disposed between the second lens element E2 and the third lens element E3 and contacts the image-side surface of the second lens E2. In this embodiment, the first spacer element P1 and the second spacer element P2 are spacers. These spacers P1 and P2 block excess external light, allowing the lenses to better support the lens barrel and enhance the structural stability of the optical imaging lenses 1001, 1002, and 1003.

[0079] The optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003 may differ in the size of the spacer element, the lens non-effective diameter area, and the lens barrel structural parameters. Table 3 shows the basic parameters of the spacer element and lens barrel of the optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003 in Example 1. As an example, the optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003 each have a lens barrel.

[0080]

[0081] Table 3 Figure 3A The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 3B The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 3C The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 3D The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion value corresponding to different image heights. Figures 3A to 3D It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0082] Example 2 The following reference 4A to 5D The optical imaging lens 2001 , the optical imaging lens 2002 , and the optical imaging lens 2003 according to the second embodiment of the present application are described. Figure 4A 、 Figure 4B and Figure 4C Schematic diagrams of the structures of an optical imaging lens 2001, an optical imaging lens 2002, and an optical imaging lens 2003 according to the second embodiment of the present application are respectively shown.

[0083] like Figure 4A 、 Figure 4B and Figure 4C As shown, the structural schematic diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 all include a lens barrel structure, imaging lens groups E1 to E3 and a plurality of spacer elements P1 to P2.

[0084] In Example 2, the structural schematics of optical imaging lenses 2001, 2002, and 2003 utilize the same imaging lens group, which includes, from the object side to the image side, a first lens E1, a second lens E2, and a third lens E3. First lens E1 has negative optical power, with both its object-side surface S1 and image-side surface S2 being concave. Second lens E2 has positive optical power, with both its object-side surface S3 and image-side surface S4 being convex. 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 an object sequentially passes through surfaces S1 to S6 and is ultimately imaged on the imaging surface. In Table 4, S7 and S9 (not shown in the figure) can be the object side surfaces of the filter or the protective glass, S8 and S10 (not shown in the figure) can be the image side surfaces of the filter or the protective glass, S11 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, which is located between the second lens and the third lens.

[0085] Table 4 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units of curvature radius and thickness are both millimeters.

[0086]

[0087] Table 4 Table 5 lists the aspheric coefficients of the aspheric lenses of the zoom lens of this embodiment, including: A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0088]

[0089] Table 5 like Figure 4A 、 Figure 4B and Figure 4CAs shown, the optical imaging lens 2001, the optical imaging lens 2002, and the optical imaging lens 2003 each include two spacer elements, namely a first spacer element P1 and a second spacer element P2. Since the positions of the two spacer elements are the same as those of the optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 in Example 1, their further description is omitted.

[0090] Optical imaging lenses 2001, 2002, and 2003 may differ in the size of their spacer elements, the non-effective lens diameter area, and the structural parameters of their lens barrels. Table 6 shows basic parameters of the spacer elements and lens barrels of optical imaging lenses 2001, 2002, and 2003 in Example 2. As an example, each of optical imaging lenses 2001, 2002, and 2003 has a lens barrel.

[0091]

[0092] Table 6 Figure 5A The chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 5B The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 5C The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 5D The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion value corresponding to different image heights. 5A to 5D It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0093] Example 3 The following reference 6A to 7D The optical imaging lens 3001 , the optical imaging lens 3002 , and the optical imaging lens 3003 according to the third embodiment of the present application are described. Figure 6A 、 Figure 6B and Figure 6C Schematic diagrams of the structures of an optical imaging lens 3001, an optical imaging lens 3002, and an optical imaging lens 3003 according to the third embodiment of the present application are respectively shown.

[0094] like Figure 6A 、 Figure 6B and Figure 6CAs shown, the structural schematic diagrams of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 all include a lens barrel structure, imaging lens groups E1 to E3 and a plurality of spacer elements P1 to P2.

[0095] In Example 3, the structural schematics of optical imaging lenses 3001, 3002, and 3003 employ the same imaging lens group, which includes, from the object side to the image side, a first lens E1, a second lens E2, and a third lens E3. The first lens E1 has negative optical power, with both its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has positive optical power, with both its object-side surface S3 and image-side surface S4 being 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 an object sequentially passes through each surface S1 to S6 and is ultimately imaged on the imaging surface. In Table 7, S7 and S9 (not shown in the figure) can be the object side surfaces of the filter or the protective glass, S8 and S10 (not shown in the figure) can be the image side surfaces of the filter or the protective glass, S11 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, which is located between the first lens and the second lens.

[0096] Table 7 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units of curvature radius and thickness are both millimeters.

[0097]

[0098] Table 7 Table 8 lists the aspheric coefficients of the aspheric lenses of the zoom lens of this embodiment, including: A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0099]

[0100] Table 8 like Figure 6A 、 Figure 6B and Figure 6C As shown, the optical imaging lens 3001, the optical imaging lens 3002, and the optical imaging lens 3003 each include two spacer elements, namely a first spacer element P1 and a second spacer element P2. Since the positions of the two spacer elements are the same as those of the optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 in Example 1, their further description is omitted.

[0101] The optical imaging lens 3001, optical imaging lens 3002, and optical imaging lens 3003 may differ in the size of the spacer element, the lens non-effective diameter area, and the lens barrel structural parameters. Table 9 shows the basic parameters of the spacer element and lens barrel of the optical imaging lens 3001, optical imaging lens 3002, and optical imaging lens 3003 in Example 3. As an example, the optical imaging lens 3001, optical imaging lens 3002, and optical imaging lens 3003 each have a lens barrel.

[0102]

[0103] Table 9 Figure 7A The chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 7B The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 7C The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7D The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion value corresponding to different image heights. 7A to 7D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0104] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002, and 3003 of Examples 1 to 3 are shown in Table 10 below.

[0105]

[0106] Table 10 The optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002, and 3003 of Examples 1 to 3 satisfy the relationship shown in Table 11.

[0107]

[0108] Table 11 The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to technical solutions formed by a specific combination of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, comprising a lens barrel, an imaging lens group disposed within the lens barrel, and a plurality of spacer elements, characterized in that: The imaging lens group includes, in order from the object side to the image side along the optical axis: a first lens having negative optical power, a second lens having positive optical power, and a third lens having positive optical 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 include at least a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; The optical imaging lens meets the following requirements: 66.89°≤HFOV≤82.73°; 5.63≤D0m / TD*Fno≤7.04; 0.94≤|f12| / (D2m-d2m)≤3.54; Among them, HFOV is half of the maximum field of view 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 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 include: a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; The optical imaging lens satisfies the following conditions: 0.99≤EP01 / (CT1+T12)≤1.69; Among them, EP01 is the spacing distance from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis, CT1 is the center thickness of the first lens on the optical axis, and T12 is the air spacing between the first lens and the second lens on the optical axis.

3. The optical imaging lens according to claim 2, wherein: The optical imaging lens satisfies the following conditions: 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 the following conditions: 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 curvature radius of the image-side surface of the first lens.

5. The optical imaging lens according to claim 2, wherein: The optical imaging lens satisfies the following conditions: 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.

6. The optical imaging lens according to claim 2, wherein: The optical imaging lens satisfies the following conditions: 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 the following conditions: 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 spacing distance between the object side end face of the lens barrel and the object side face of the first spacer element along the optical axis, and EP12 is the distance between the image side face of the first spacer element and the object side face of the second spacer element along the optical axis.

8. The optical imaging lens according to claim 2, wherein: The optical imaging lens satisfies the following conditions: 5.05≤EP12*V2 / f23≤6.84; 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, 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 spacing distance from the object-side end surface of the lens barrel to the object-side surface of the first spacing element along the optical axis.

10. The optical imaging lens according to claim 2, wherein: The optical imaging lens satisfies the following conditions: 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 one of claims 1 to 10, wherein: The optical imaging lens satisfies the following conditions: -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 to 10, wherein: The optical imaging lens satisfies the following conditions: 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 to 10, wherein: The optical imaging lens satisfies the following conditions: -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 one of claims 1 to 10, wherein: The optical imaging lens satisfies the following conditions: 3.16≤ImgH / (D0m-d0m)≤4.35; Among them, ImgH is half of the diagonal 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