Optical imaging lens

Abstract

The invention discloses an optical imaging lens. The optical imaging lens comprises a lens barrel, an optical lens group and a spacing element group, wherein the optical lens group and the spacing element group are arranged in the lens barrel. The optical lens group sequentially comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power from the object side to the image side along the optical axis. Wherein the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface. The spacer element group includes a second spacer element disposed on and in contact with the image side surface of the second lens. Half Semi-FOV of the maximum field angle of the optical imaging lens meets the following condition: 71 degrees < Semi-FOV < = 74.5 degrees; and the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second spacing element and the inner diameter d2m of the image side surface of the second spacing element meet the condition that V2 / (d2s + d2m) is greater than 3.20 mm <-1 > and less than 5.60 mm <-1 >.

Description

Technical Field

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

[0002] Time of Flight (TOF) lens is an optical imaging lens that obtains depth information based on the time-of-flight ranging method to achieve three-dimensional imaging and spatial measurement. It is widely used in virtual reality, face recognition, autonomous driving, machine vision and other fields.

[0003] When the optical imaging lens is used as a TOF lens, the optical imaging lens usually has the characteristic of a large field of view. However, in order to achieve the characteristic of a large field of view of the optical imaging lens, the optical imaging lens usually has a flip-down structure, which will cause more stray light to be generated at the position of the second lens, thereby affecting the imaging quality of the optical imaging lens. Summary of the invention

[0004] On the one hand, the present application provides such an optical imaging lens, which includes a lens barrel and an optical lens group and a spacer element group placed in the lens barrel. The optical lens group includes a first lens with negative optical focal length, a second lens with positive optical focal length and a third lens with positive optical focal length in sequence from the object side to the image side along the optical axis. Among them, the object side surface of the first lens is concave, and the image side surface is concave; the image side surface of the second lens is convex; and the object side surface of the third lens is convex. The spacer element group includes a second spacer element placed on the image side surface of the second lens and in contact with the image side surface of the second lens. Among them, the number of lenses with optical focal length in the optical imaging lens is three. Semi-FOV, half of the maximum field of view angle of the optical imaging lens, satisfies: 71°<Semi-FOV≤74.5°; the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 3.20mm -1 <V2 / (d2s+d2m)<5.60mm -1 .

[0005] According to an exemplary embodiment of the present application, a center thickness CT2 of the second lens on the optical axis and a curvature radius R2 of the image-side surface of the first lens satisfy: 0.55<CT2 / R2≤0.75.

[0006] According to an exemplary embodiment of the present application, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the third lens, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 3.80<TD / (D0s-d0s)<7.85.

[0007] According to an exemplary embodiment of the present application, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the curvature radius R1 of the object-side surface of the first lens satisfy: 0.65≤f1×N1 / R1<1.35.

[0008] According to an exemplary embodiment of the present application, half of the image height ImgH corresponding to the maximum field angle of the optical imaging lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 0.35<ImgH / (D0m-d0m)≤0.90.

[0009] According to an exemplary embodiment of the present application, the total effective focal length f of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 0.30<f / (d0s-d0m)<0.90.

[0010] According to an exemplary embodiment of the present application, the outer diameter D0m of the image side end surface of the lens barrel, the maximum length L of the lens barrel along the direction of the optical axis, the total effective focal length f of the optical imaging lens, and the sum ΣCT of the center thickness of each lens in the optical lens group on the optical axis satisfy: 0.44≤D0m / L×f / ΣCT<0.75.

[0011] According to an exemplary embodiment of the present application, the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens and the inner diameter d2m of the image side surface of the second spacer element satisfy: -4.30<(R4-R5) / d2m<-2.10.

[0012] According to an exemplary embodiment of the present application, the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, and the center thickness CT2 of the second lens on the optical axis satisfy: 6.20<(|R4|+|R5|) / CT2<9.60.

[0013] According to an exemplary embodiment of the present application, the spacer element group also includes a second auxiliary spacer element disposed on the image side surface of the second spacer element and in contact with the image side surface of the second spacer element; the maximum thickness CP2 of the second spacer element, the maximum thickness CP2b of the second auxiliary spacer element and the aperture number Fno of the optical imaging lens satisfy: 0.95mm<(CP2+CP2b)×Fno<2.00mm.

[0014] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens; the distance TD from the object side surface of the first lens to the image side surface of the third lens on the optical axis and the distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis satisfy: 4.65<TD / EP12<9.15.

[0015] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens; the combined focal length f23 of the second lens and the third lens, the refractive index N2 of the second lens and the distance EP12 along the optical axis between the image side surface of the first spacer element and the object side surface of the second spacer element satisfy: 1.25<|f23| / (N2×EP12)<5.10.

[0016] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; the refractive index N1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis satisfy: 1.73mm<N1×(CT1+EP01)≤2.5mm.

[0017] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; the total effective focal length f of the optical imaging lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 0.18≤f / (D1m-d1m)≤0.35.

[0018] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens; the inner diameter d1m of the image side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the curvature radius R1 of the object side surface of the first lens satisfy: -1.00<(d1m+d1s) / R1≤-0.40.

[0019] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis, the distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis, and the maximum length L of the lens barrel along the direction of the optical axis satisfy: 0.35<(EP01+EP12) / L<0.45.

[0020] The optical imaging lens provided in the present application adopts three lenses, and the optical imaging lens satisfies "71°<Semi-FOV≤74.5°", which can realize the characteristics of a large field of view angle of the optical imaging lens. However, in this case, the optical imaging lens is usually in an inverted structure, which will cause more stray light to be generated at the position of the second lens, thereby affecting the imaging quality of the optical imaging lens. Therefore, by controlling the ratio of the Abbe number of the second lens to the sum of the inner diameters of the object side and the image side of the second spacing element within a certain range, it is beneficial to improve the improvement effect on stray light, thereby reducing the stray light projected onto the imaging surface and improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which: Figure 1 A parameter annotation diagram of an optical imaging lens according to the present application is shown; Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown; Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown; Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown; Figure 5 , Figure 6 , Figure 7 , Figure 8 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens according to Examples 1, 2 and 3 of the present application are shown; Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown; Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown; Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown; Fig.12 , Fig.13 , Fig.14 , Fig.15 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens according to Examples 4, 5 and 6 of the present application are shown; Fig.16 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown; Fig.17A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown; Fig.18 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown; Fig.19 , Fig. 20 , Fig.21 , Fig. 22 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens according to Examples 7, 8 and 9 of the present application are shown; Fig.23 and Fig.24 It is shown that the optical imaging lens of the present application satisfies V2 / (d2s+d2m)=7.2mm -1 Stray light path diagram and spot diagram; Fig.25 and Fig.26 It is shown that the optical imaging lens of the present application satisfies V2 / (d2s+d2m)=2.8mm -1 Stray light path diagram and spot diagram; Fig. 27 and Fig.28 It is shown that the optical imaging lens of the present application satisfies V2 / (d2s+d2m)=4.5mm -1 The stray light path diagram and spot diagram. DETAILED DESCRIPTION

[0022] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only 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.

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

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

[0025] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side (e.g., the human eye side) is called the object side surface of the lens, and the surface of each lens closest to the image side (e.g., the display screen side) is called the image side surface of the lens.

[0026] The optical imaging lens of the exemplary embodiment of the present application can be simulated by software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging lens can be simulated by CODEV software. In the process of simulation using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape model of the software and / or tool used.

[0027] It should also be understood that the terms "including" and / or "having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the term "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.

[0028] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0029] 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 present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Figure 1 The structure arrangement diagram of the optical imaging lens of the exemplary embodiment of the present application and the schematic diagram of some parameters are shown. It should be understood by those skilled in the art that some parameters commonly used in some fields, such as d1m and D1m, are not shown in the figure. Figure 1 Shown in. Figure 1 Only some parameters of the optical imaging lens and the spacer element of the present application are shown as examples. Figure 1, d0s represents the inner diameter of the object side end surface of the lens barrel, D0s represents the outer diameter of the object side end surface of the lens barrel, d0m represents the inner diameter of the image side end surface of the lens barrel, D0m represents the outer diameter of the image side end surface of the lens barrel, d1s represents the inner diameter of the object side surface of the first spacing element, D1s represents the outer diameter of the object side surface of the first spacing element, d2s represents the inner diameter of the object side surface of the second spacing element, D2s represents the outer diameter of the object side surface of the second spacing element, d2m represents the inner diameter of the image side surface of the second spacing element, D2m represents the outer diameter of the image side surface of the second spacing element, d 2bs represents the inner diameter of the object side surface of the second auxiliary spacer element, D2bs represents the outer diameter of the object side surface of the second auxiliary spacer element, CP1 represents the maximum thickness of the first spacer element, CP2 represents the maximum thickness of the second spacer element, CP2b represents the maximum thickness of the second auxiliary spacer element, L represents the maximum length of the lens barrel along the direction of the optical axis, EP01 represents the distance between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis, and EP12 represents the distance between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis.

[0031] For a three-piece wide-angle lens, the optical imaging lens is usually in a flip-up structure, which will cause more stray light to be generated at the position of the second lens, thereby affecting the imaging quality of the optical imaging lens.

[0032] refer to Figure 2 , Figure 3 , Figure 4 , Fig. 9 , Fig.10 , Fig.11 , Fig.16 , Fig.17 and Fig.18 In the first aspect of the present application, an optical imaging lens is provided, which may include a lens barrel and an optical lens group and a spacer element group disposed in the lens barrel. The optical lens group may include a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power in sequence from the object side to the image side along the optical axis. Among them, the object side surface of the first lens is concave, and the image side surface is concave; the image side surface of the second lens is convex; and the object side surface of the third lens is convex. The spacer element group may include a second spacer element, and the second spacer element is disposed on the image side surface of the second lens and is at least partially in contact with the image side surface of the second lens. Among them, the number of lenses with optical power in the optical imaging lens is three. Semi-FOV, half of the maximum field of view angle of the optical imaging lens, may satisfy: 71°<Semi-FOV≤74.5°. Reasonable configuration of half of the maximum field of view angle of the optical imaging lens can realize the large field of view angle characteristic of the optical imaging lens.

[0033] In some embodiments, the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second spacing element, and the inner diameter d2m of the image side surface of the second spacing element may satisfy: 3.20 mm-1 <V2 / (d2s+d2m)<5.60mm -1 By controlling the ratio of the Abbe number of the second lens to the sum of the inner diameters of the object side and the image side of the second spacing element within a certain range, it is beneficial to improve the improvement effect on stray light, thereby reducing the stray light emitted to the imaging surface and improving the imaging quality of the optical imaging lens.

[0034] Combine the following Fig.23 , Fig.24 , Fig.25 , Fig.26 , Fig. 27 and Fig.28 To describe the imaging effect when the optical imaging lens satisfies 71°<Semi-FOV≤74.5°, where: Fig.23 and Fig.24 The optical imaging lenses satisfy V2 / (d2s+d2m)=7.2mm -1 Stray light path diagram and spot diagram; Fig.25 and Fig.26 The optical imaging lens satisfies V2 / (d2s+d2m)=2.8mm -1 Stray light path diagram and spot diagram; Fig. 27 and Fig.28 The optical imaging lenses satisfy V2 / (d2s+d2m)=4.5mm -1 The stray light path diagram and spot diagram.

[0035] When the optical lens satisfies V2 / (d2s+d2m)=7.2mm -1 When the Abbe number of the second lens and the inner diameter of the second spacing element are set unreasonably, this will cause the light to be incident on the inner diameter surface of the second spacing element and reflected by the inner diameter surface, thereby generating more stray light (such as Fig.24 ). When the optical lens satisfies V2 / (d2s+d2m)=2.8mm -1 When the Abbe number of the second lens and the inner diameter of the second spacing element are set unreasonably, the second spacing element will be unable to effectively intercept the stray light emitted from the non-effective diameter part of the second lens, thereby generating more stray light (such as Fig.26 ). However, when the optical imaging lens satisfies V2 / (d2s+d2m)=4.5mm -1 When the Abbe number of the second lens and the inner diameter of the second spacing element are within a reasonable range, the second spacing element can effectively intercept the stray light emitted from the non-effective diameter portion of the second lens, and avoid the stray light generated by the light incident on the inner diameter surface of the second spacing element. The stray light of the optical imaging lens is significantly reduced (e.g. Fig.28 ). It can be seen that by controlling the optical imaging lens to meet 71°<Semi-FOV≤74.5° and 3.20mm-1 <V2 / (d2s+d2m)<5.60mm -1 , which can reduce stray light and improve the imaging quality of optical imaging lenses.

[0036] In an exemplary embodiment, the optical imaging lens may further include a stop. The stop may be disposed between the first lens and the second lens.

[0037] In an exemplary embodiment, the spacer element group may include one or more of a first spacer element, a second spacer element, and a second auxiliary spacer element. Reasonable use of spacer elements can effectively avoid stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0038] In an exemplary embodiment, the outer peripheral surface of at least one lens in the optical lens group may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the lens may be smaller than the outer diameter of the non-trimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the non-trimmed portion of the lens. For example, the outer diameter of the object side surface of the lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the object side, and the outer diameter of the image side surface of the lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the image side.

[0039] In an exemplary embodiment, the outer peripheral surface of at least one of the spacer elements in the spacer element group may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer element may be smaller than the outer diameter of the non-trimmed portion of the spacer element. When the outer peripheral surface of the spacer element has a trimmed portion, the outer diameter of the spacer element generally refers to the outer diameter of the non-trimmed portion of the spacer element. For example, the outer diameter of the object side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element closest to the object side, and the outer diameter of the image side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element closest to the image side.

[0040] In an exemplary embodiment, the center thickness CT2 of the second lens on the optical axis and the curvature radius R2 of the image side surface of the first lens may satisfy: 0.55<CT2 / R2≤0.75. Reasonable configuration of the ratio of the center thickness of the second lens on the optical axis to the curvature radius of the image side surface of the first lens can make the curvature of the image side surface of the first lens appropriate, ensure that the image side surface of the first lens has a sufficiently wide mechanism portion (for example, a non-effective diameter portion), thereby ensuring that there is a sufficient bearing width between the first lens and the first spacing element and that the first lens has sufficient stray light improvement space; at the same time, the center thickness of the second lens on the optical axis can be limited, thereby improving the performance stability of the optical imaging lens during the production process and improving the optical performance of the optical imaging lens.

[0041] In an exemplary embodiment, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the third lens, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel can satisfy: 3.80<TD / (D0s-d0s)<7.85. By controlling the above conditional expression, the inner and outer diameters of the object side end surface of the lens barrel can be limited, and it can be ensured that the object side end surface of the lens barrel has sufficient adsorption space. At the same time, under the condition of meeting the minimum thickness of the lens barrel molding process, the distance on the optical axis from the object side surface of the first lens to the image side surface of the third lens can be reduced as much as possible, so as to realize the miniaturization of the optical imaging lens and facilitate the assembly of the optical imaging lens and the whole device.

[0042] In an exemplary embodiment, the spacer element group may include a first spacer element. The first spacer element may be placed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The distance TD from the object side surface of the first lens to the image side surface of the third lens on the optical axis and the distance EP12 from the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis may satisfy: 4.65<TD / EP12<9.15. By controlling the above conditional expression, the edge thickness of the second lens can be constrained, which is beneficial to the smooth molding of the second lens. At the same time, the proportion of the edge thickness of the second lens in the entire optical imaging lens can be limited, thereby improving the stability of the optical imaging lens.

[0043] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be placed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The second spacer element is placed on the image side surface of the second lens and at least partially contact the image side surface of the second lens. The combined focal length f23 of the second lens and the third lens, the refractive index N2 of the second lens, and the distance EP12 on the optical axis between the image side surface of the first spacer element and the object side surface of the second spacer element may satisfy: 1.25<|f23| / (N2×EP12)<5.10. By controlling the above conditional expression, the curved shapes of the image side surface of the second lens and the object side surface of the third lens can be constrained, and in combination with the refractive index of the second lens, the assembly stability of the second lens can be effectively improved to ensure that the ghost image energy threshold of the optical imaging lens is at a reasonable level; at the same time, the distance on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element can be limited, so that the optical imaging lens has sufficient space for stray light improvement and improves the stability of the optical imaging lens in the reliability experiment.

[0044] In an exemplary embodiment, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the curvature radius R1 of the object side surface of the first lens can satisfy: 0.65≤f1×N1 / R1<1.35. By controlling the above conditional expression, the effective radius of the first lens can be constrained, thereby improving the optical performance of the optical imaging lens; at the same time, the curvature degree of the object side surface of the first lens can be limited, thereby avoiding the first lens from being unable to be processed due to an excessively large curvature radius, thereby improving the processability of the first lens. In addition, due to the limitation of the shape, the first lens will bulge out of the lens barrel. By controlling the curvature radius of the object side surface of the first lens, the bulge degree of the first lens can be controlled, thereby preventing the first lens from interfering with other components in the entire device, thereby improving the assembly yield of the optical imaging lens.

[0045] In an exemplary embodiment, half of the image height ImgH corresponding to the maximum field of view of the optical imaging lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel can satisfy: 0.35<ImgH / (D0m-d0m)≤0.90. By controlling the above conditional expression, the half image height of the optical imaging lens can be constrained. The larger the half image height, the larger the outer diameter of the image side end surface of the lens barrel, and the larger the light transmission space, thereby ensuring the imaging quality of the optical imaging lens; at the same time, the inner diameter and outer diameter of the image side end surface of the lens barrel can be limited, so that the lens barrel can be supported by the lens during the assembly process.

[0046] In an exemplary embodiment, the total effective focal length f of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel may satisfy: 0.30<f / (d0s-d0m)<0.90. By controlling the above conditional expression, the inner diameters of the object side end surface and the image side end surface of the lens barrel can be constrained, thereby constraining the light transmission of the optical imaging lens, reducing the stray light of the optical imaging lens, and improving the imaging quality of the optical imaging lens.

[0047] In an exemplary embodiment, the spacer element group may include a first spacer element. The first spacer element may be placed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The refractive index N1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis may satisfy: 1.73mm<N1×(CT1+EP01)≤2.5mm. By controlling the above conditional formula, the distance between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis can be constrained to avoid blocking of light by the lens barrel and ensure the transmission efficiency of light in the first lens; at the same time, the center thickness of the first lens on the optical axis can be limited, so that the overall shape of the first lens is uniform, which is conducive to the processing and molding of the first lens.

[0048] In an exemplary embodiment, the spacer element group may include a first spacer element. The first spacer element may be placed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The total effective focal length f of the optical imaging lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element may satisfy: 0.18≤f / (D1m-d1m)≤0.35. By controlling the above conditional expression, the inner diameter of the image side surface of the first spacer element can be controlled within a certain range to ensure that the optical imaging lens has a certain stray light improvement effect; at the same time, limiting the outer diameter of the image side surface of the first spacer element can enable the first lens to have sufficient adsorption and dispensing space; at the same time, the effective focal length of the optical imaging lens is within a reasonable range, which is beneficial for the optical imaging lens to have a larger imaging area and improve the imaging quality.

[0049] In an exemplary embodiment, the spacer element group may include a first spacer element. The first spacer element may be placed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The inner diameter d1m of the image side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the curvature radius R1 of the object side surface of the first lens may satisfy: -1.00<(d1m+d1s) / R1≤-0.40. By controlling the above conditional expression, the inner diameter and outer diameter of the first spacer element can be constrained to ensure that the first spacer element effectively blocks stray light; at the same time, the curvature radius of the object side surface of the first lens can be limited, so that the angle of the outgoing light of the first lens is reasonable, the generation of stray light is reduced, and the clarity of the imaging is ensured.

[0050] In an exemplary embodiment, the outer diameter D0m of the image side end surface of the lens barrel, the maximum length L of the lens barrel along the direction of the optical axis, the total effective focal length f of the optical imaging lens, and the sum of the center thickness of each lens in the optical lens group on the optical axis ΣCT can satisfy: 0.44≤D0m / L×f / ΣCT<0.75. By controlling the above conditional expression, the maximum length of the lens barrel along the direction of the optical axis can be constrained within a reasonable range, the volume of the optical imaging lens can be reduced, and the optical imaging lens can be made ultra-thin. At the same time, when the optical imaging lens meets certain optical performance, the optical imaging lens has sufficient application space.

[0051] In an exemplary embodiment, the spacer element group may include a second spacer element and a second auxiliary spacer element. The second spacer element is placed on the image side surface of the second lens and is in at least partial contact with the image side surface of the second lens. The second auxiliary spacer element may be placed on the image side surface of the second spacer element and is in at least partial contact with the image side surface of the second spacer element. The maximum thickness CP2 of the second spacer element, the maximum thickness CP2b of the second auxiliary spacer element and the aperture number Fno of the optical imaging lens may satisfy: 0.95mm<(CP2+CP2b)×Fno<2.00mm. By controlling the above conditional expression, it can be ensured that the second spacer element has sufficient space for stray light improvement, and the maximum thickness of the second spacer element is constrained within a reasonable range to avoid affecting the assembly stability due to its excessive maximum thickness; at the same time, it can also limit the aperture number of the optical imaging lens, which is beneficial to ensure that the optical imaging lens has sufficient light input and improve the imaging quality.

[0052] In an exemplary embodiment, the spacer element group may include a second spacer element. The second spacer element is placed on the image side surface of the second lens and is in at least partial contact with the image side surface of the second lens. The radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the inner diameter d2m of the image side surface of the second spacer element may satisfy: -4.30<(R4-R5) / d2m<-2.10. By controlling the above-mentioned conditional formula, it is helpful to control the degree of deflection of light between the second lens and the third lens, and improve the imaging quality of the optical imaging lens; at the same time, it is also possible to limit the inner diameter of the image side surface of the second spacer element, so that the second spacer element effectively blocks stray light, reduces stray light of the optical imaging lens, and improves the imaging quality of the optical imaging lens.

[0053] In an exemplary embodiment, the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, and the center thickness CT2 of the second lens on the optical axis can satisfy: 6.20<(|R4|+|R5|) / CT2<9.60. By controlling the above conditional expression, the degree of deflection of light between the second lens and the third lens can be controlled, and the imaging quality of the optical imaging lens can be improved; at the same time, the center thickness of the second lens on the optical axis can be constrained, avoiding the difficulty of processing due to the excessive center thickness of the second lens and the excessive edge thickness, thereby improving the processability of the second lens.

[0054] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be placed on the image side of the first lens and at least partially contact the image side of the first lens. The second spacer element is placed on the image side of the second lens and at least partially contact the image side of the second lens. The distance EP01 between the object side end face of the lens barrel and the object side of the first spacer element along the optical axis, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and the maximum length L of the lens barrel along the direction of the optical axis may satisfy: 0.35<(EP01+EP12) / L<0.45. By controlling the above conditional expression, the edge thickness of the first lens and the second lens and the height of the glue dispensing at the non-effective diameter part of the first lens can be constrained, so that the head structure of the optical imaging lens does not block light, and the smooth molding of the first lens and the second lens and the glue dispensing space of the first lens are ensured; at the same time, the maximum length of the lens barrel along the direction of the optical axis can be limited, so that the lens barrel does not interfere with the module in the whole device when the lens barrel does not block light.

[0055] According to the above-mentioned embodiment of the present application, the optical imaging lens can use three lenses, at least one spacer element and a lens barrel. By reasonably allocating the parameters of each lens, each spacer element and the lens barrel, it can be ensured that the optical imaging lens has a large field of view, reduce the risk of stray light of the optical imaging lens, and improve the imaging quality of the optical imaging lens.

[0056] In an embodiment of the present application, at least one of the surfaces of each lens in the first lens to the third lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens to the seventh lens are both aspherical surfaces.

[0057] It should be understood that the present application is concerned with how to overcome the problem of introducing more stray light due to the realization of a large field of view characteristic. The specific focal power distribution of the three lenses and the surface configuration of each lens are not the focus of the present application, and these configurations can be adjusted accordingly as needed. In other words, although the embodiments of the present application show several specific focal power distributions and surface configurations for the optical lens group, and show specific sizes for the spacer element group, it should be understood that these embodiments are only exemplary, and the optical lens group in the present application should not be limited to the several specific situations shown in the embodiments, but should be widely understood as a three-piece optical lens group with a large field of view.

[0058] The second aspect of the present application provides such an optical imaging lens, which may include a lens barrel and an optical lens group and a spacer element group assembled in the lens barrel. The optical lens group may include a first lens, a second lens, and a third lens in sequence from the object side to the image side along the optical axis. The number of lenses with optical power in the optical imaging lens is three. The spacer element group may include a second spacer element. The second spacer element is placed on the image side of the second lens and is in at least partial contact with the image side of the second lens.

[0059] The number of lenses with optical power of the optical imaging lens is three. The maximum field of view FOV of the optical imaging lens can satisfy: 71°<Semi-FOV≤74.5°; the total effective focal length f of the optical imaging lens, the inner diameter d0s of the object side end face of the lens barrel, and the inner diameter d0m of the image side end face of the lens barrel can satisfy: 0.30<f / (d0s-d0m)<0.90. By controlling the optical imaging lens to satisfy 71°<Semi-FOV≤74.5° and 0.30<f / (d0s-d0m)<0.90, the large field of view angle characteristic of the optical imaging lens can be achieved, and the inner diameters of the object side end face and the image side end face of the lens barrel are within a reasonable range, thereby constraining the light transmittance of the optical imaging lens, reducing the stray light of the optical imaging lens, and improving the imaging quality of the optical imaging lens.

[0060] Those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0061] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0062] Example 1

[0063] The following reference Figure 2 An optical imaging lens according to Embodiment 1 of the present application is described.

[0064] like Figure 2 As shown, the optical imaging lens includes a lens barrel P0, a spacer element group and an optical lens group. The optical lens group includes a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2.

[0065] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. In the example, an optical element may be further provided on the image side of the third lens E3, and the optical element may be, for example, a filter or a protective glass, and the optical element has an object side surface S7 and an image side surface S8. Light from the object passes through each surface S1 to S8 in sequence and is finally imaged on an imaging surface S9 (not shown).

[0066] The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b. The spacer elements can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

[0067] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0068] Table 1

[0069] The object side surface and the image side surface of any lens among the first lens E1 to the third lens E3 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula: (1) in, is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric surface S1-S6 in Example 1.

[0070] Table 2

[0071] Example 2

[0072] The following is based on Figure 3 An optical imaging lens according to Embodiment 2 of the present application is described.

[0073] like Figure 3As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0074] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Example 1 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 1 are shown in Table 8 below.

[0075] Example 3

[0076] The following reference Figure 4 An optical imaging lens according to Embodiment 3 of the present application is described.

[0077] like Figure 4 As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0078] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Example 1 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 1 are shown in Table 8 below.

[0079] Figure 5 The axial chromatic aberration curves of the optical imaging lenses of Examples 1, 2 and 3 are shown, which represent the deviation of the focal point of light rays of different wavelengths after passing through the optical imaging lens. Figure 6 The astigmatism curves of the optical imaging lenses of Examples 1, 2 and 3 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 7 The distortion curves of the optical imaging lenses of Examples 1, 2 and 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 8 The magnification chromatic aberration curves of the optical imaging lenses of Examples 1, 2 and 3 are shown, which represent the aberration of different image heights of light on the imaging surface after passing through the lens. Figures 5 to 8 It can be seen that the optical imaging lenses provided in Examples 1, 2 and 3 can achieve good imaging quality.

[0080] Example 4

[0081] The following reference Fig. 9 An optical imaging lens according to Embodiment 4 of the present application is described.

[0082] like Fig. 9 As shown, the optical imaging lens includes a lens barrel P0, a spacer element group and an optical lens group. The optical lens group includes a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2.

[0083] The first lens E1 has negative power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. In the example, an optical element may be provided on the image side of the third lens E3, and the optical element may be, for example, a filter or a protective glass, and the optical element has an object side surface S7 and an image side surface S8. Light from the object passes through each surface S1 to S8 in sequence and is finally imaged on an imaging surface S9 (not shown).

[0084] The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b. The spacer elements can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

[0085] Table 3 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0086] Table 3

[0087] The object side surface and the image side surface of any lens among the first lens E1 to the third lens E3 are aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface S1-S6 in Example 4.

[0088] Table 4

[0089] Example 5

[0090] The following is based on Fig.10 An optical imaging lens according to Embodiment 5 of the present application is described.

[0091] like Fig.10 As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0092] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Example 4 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 4 are shown in Table 8 below.

[0093] Example 6

[0094] The following reference Fig.11 An optical imaging lens according to Embodiment 3 of the present application is described.

[0095] like Fig.11 As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0096] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Example 4 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 4 are shown in Table 8 below.

[0097] Fig.12The axial chromatic aberration curves of the optical imaging lenses of Examples 4, 5 and 6 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.13 The astigmatism curves of the optical imaging lenses of Examples 4, 5 and 6 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.14 The distortion curves of the optical imaging lenses of Examples 4, 5 and 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.15 The magnification chromatic aberration curves of the optical imaging lenses of Examples 4, 5 and 6 are shown, which represent the aberration of different image heights on the imaging surface after the light passes through the lens. Figures 12 to 15 It can be seen that the optical imaging lenses provided in Examples 4, 5 and 6 can achieve good imaging quality.

[0098] Example 7

[0099] The following reference Fig.16 An optical imaging lens according to Embodiment 7 of the present application is described.

[0100] like Fig.16 As shown, the optical imaging lens includes a lens barrel P0, a spacer element group and an optical lens group. The optical lens group includes a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2.

[0101] The first lens E1 has negative power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. In the example, an optical element may be provided on the image side of the third lens E3, and the optical element may be, for example, a filter or a protective glass, and the optical element has an object side surface S7 and an image side surface S8. Light from the object passes through each surface S1 to S8 in sequence and is finally imaged on an imaging surface S9 (not shown).

[0102] The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b. The spacer elements can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

[0103] Table 5 shows the basic parameters of the optical imaging lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0104] Table 5

[0105] The object side surface and the image side surface of any lens among the first lens E1 to the third lens E3 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface S1-S6 in Example 7.

[0106] Table 6

[0107] Example 8

[0108] The following is based on Fig.17 An optical imaging lens according to Example 8 of the present application is described.

[0109] like Fig.17 As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0110] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Example 7 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 7 are shown in Table 8 below.

[0111] Example 9

[0112] The following reference Fig.18 An optical imaging lens according to Example 9 of the present application is described.

[0113] like Fig.18 As shown, the optical imaging lens includes a lens barrel P0 and a spacer element group and an optical lens group disposed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, and a third lens E3 arranged in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. The spacer element group may include a first spacer element P1, a second spacer element P2, and a second auxiliary spacer element P2b.

[0114] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Example 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Example 7 is that the structure size of at least part of the elements in the lens barrel P0 and the spacer element group is different. The values ​​of multiple parameters of the lens barrel P0 and the spacer element group included in the optical imaging lens of this embodiment and Example 7 are shown in Table 8 below.

[0115] Fig.19 The axial chromatic aberration curves of the optical imaging lenses of Examples 7, 8 and 9 are shown, which indicate the deviation of the focal point of light rays of different wavelengths after passing through the optical imaging lens. Fig. 20 The astigmatism curves of the optical imaging lenses of Examples 7, 8 and 9 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.21 The distortion curves of the optical imaging lenses of Examples 7, 8 and 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig. 22 The magnification chromatic aberration curves of the optical imaging lenses of Examples 7, 8 and 9 are shown, which represent the aberration of different image heights of light on the imaging surface after passing through the lens. Figures 19 to 22 It can be seen that the optical imaging lenses provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0116] Table 7 shows the optical parameters of each of Examples 1-9.

[0117] Table 7

[0118] Table 8 shows the values ​​of d1s, d1m, D1m, d2s, d2m, d0s, d0m, D0s, D0m, EP01, EP12, CP2, CP2b and L parameters in each embodiment of embodiments 1-9. At least some of the above parameters can be calculated according to Figure 1 The measurement is carried out using the marking method shown.

[0119] Table 8

[0120] Table 9 shows the values ​​of the conditional expressions of each of Examples 1 to 9.

[0121] Table 9

[0122] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. An optical imaging lens, characterized in that: include: An optical lens group, comprising, 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; wherein the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the image side surface of the second lens is a convex surface; and the object side surface of the third lens is a convex surface; a spacer element group including a second spacer element disposed on and in contact with the image side surface of the second lens; and A lens barrel, wherein the optical lens group and the spacer element group are placed in the lens barrel; Wherein, the optical imaging lens has three lenses with optical power; Half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfies: 71°<Semi-FOV≤74.5°; The Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 3.20 mm -1 <V2 / (d2s+d2m)<5.60mm -1 .

2. The optical imaging lens according to claim 1, wherein: A central thickness CT2 of the second lens on the optical axis and a curvature radius R2 of the image side surface of the first lens satisfy: 0.55<CT2 / R2≤0.

75.

3. The optical imaging lens according to claim 1, wherein: A distance TD from the object side surface of the first lens to the image side surface of the third lens on the optical axis, an outer diameter D0s of the object side end surface of the lens barrel, and an inner diameter d0s of the object side end surface of the lens barrel satisfy: 3.80<TD / (D0s-d0s)<7.

85.

4. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the curvature radius R1 of the object-side surface of the first lens satisfy: 0.65≤f1×N1 / R1<1.

35.

5. The optical imaging lens according to claim 1, wherein: Half of the image height ImgH corresponding to the maximum field angle of the optical imaging lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 0.35<ImgH / (D0m-d0m)≤0.

90.

6. The optical imaging lens according to claim 1, wherein: The total effective focal length f of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 0.30<f / (d0s-d0m)<0.

90.

7. The optical imaging lens according to claim 1, wherein: The outer diameter D0m of the image side end surface of the lens barrel, the maximum length L of the lens barrel along the direction of the optical axis, the total effective focal length f of the optical imaging lens and the sum ΣCT of the center thickness of each lens in the optical lens group on the optical axis satisfy: 0.44≤D0m / L×f / ΣCT<0.

75.

8. The optical imaging lens according to claim 1, wherein: The curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, and the inner diameter d2m of the image side surface of the second spacer element satisfy: -4.30<(R4-R5) / d2m<-2.

10.

9. The optical imaging lens according to claim 1, wherein: A curvature radius R4 of the image side surface of the second lens, a curvature radius R5 of the object side surface of the third lens, and a center thickness CT2 of the second lens on the optical axis satisfy: 6.20<(|R4|+|R5|) / CT2<9.

60.

10. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a second auxiliary spacer element disposed on the image side surface of the second spacer element and in contact with the image side surface of the second spacer element; The maximum thickness CP2 of the second spacer element, the maximum thickness CP2b of the second auxiliary spacer element and the aperture number Fno of the optical imaging lens satisfy: 0.95mm<(CP2+CP2b)×Fno<2.00mm.

11. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The distance TD from the object side surface of the first lens to the image side surface of the third lens on the optical axis and the distance EP12 from the image side surface of the first spacing element and the object side surface of the second spacing element along the optical axis satisfy: 4.65<TD / EP12<9.

15.

12. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The combined focal length f23 of the second lens and the third lens, the refractive index N2 of the second lens, and the distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis satisfy: 1.25<|f23| / (N2×EP12)<5.

10.

13. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The refractive index N1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacing element along the optical axis satisfy: 1.73mm<N1×(CT1+EP01)≤2.5mm.

14. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The total effective focal length f of the optical imaging lens, the outer diameter D1m of the image side surface of the first spacing element, and the inner diameter d1m of the image side surface of the first spacing element satisfy: 0.18≤f / (D1m-d1m)≤0.

35.

15. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; An inner diameter d1m of the image side surface of the first spacer element, an inner diameter d1s of the object side surface of the first spacer element, and a curvature radius R1 of the object side surface of the first lens satisfy: -1.00<(d1m+d1s) / R1≤-0.

40.

16. The optical imaging lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element along the optical axis, the distance EP12 between the image side face of the first spacer element and the object side face of the second spacer element along the optical axis, and the maximum length L of the lens barrel along the direction of the optical axis satisfy the following conditions: 0.35<(EP01+EP12) / L<0.45.

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