Optical imaging lens

Abstract

The present invention provides an optical imaging lens. Along the optical axis direction of the optical imaging lens from the object side to the image side, it sequentially includes: a first lens with a positive optical power; a second lens with a negative optical power; a third lens with a positive optical power; wherein, the effective focal length f of the optical imaging lens satisfies: f > 20 mm; and the relationship between the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfies: -3.0 < f / f2 < -2.0. The present invention solves the problem of poor imaging quality existing in the camera lens in the prior art.

Description

Technical Field

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

[0002] With the development of science and technology, the trend of miniaturization of camera lenses has become increasingly obvious. As we all know, the more pixels a CMOS (complementary metal oxide semiconductor) has, the more times the photos it can be magnified. Based on this principle, when using a large CMOS to shoot, an algorithm can be used to crop the image so that only a part of the image is displayed and this part is magnified to create a zoom effect. This method of achieving zoom is also called digital zoom. The disadvantage of this method is that the more the image is magnified, the fewer pixels there are, and the blurrier the photo.

[0003] That is to say, the camera lens in the prior art has the problem of poor imaging quality. Summary of the invention

[0004] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of poor imaging quality of the camera lens in the prior art.

[0005] In order to achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens is provided, which comprises, in order from the object side to the image side along the optical axis direction of the optical imaging lens: a first lens having positive focal power; a second lens having negative focal power; a third lens having positive focal power; wherein the effective focal length f of the optical imaging lens satisfies: f>20mm; the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy: -3.0 <f / f2<-2.0。

[0006] Furthermore, the actual propagation distance of the principal ray from the object side of the first lens to the imaging surface of the optical imaging lens satisfies the following relationship between the equivalent distance TL in air and the entrance pupil diameter EPD of the optical imaging lens: 3.0 <TL / EPD<3.5。

[0007] Furthermore, the effective focal length f3 of the third lens and the equivalent distance FL in the air of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface of the optical imaging lens satisfy the following relationship: 0.6 <f3 / FL≤1.0。

[0008] Furthermore, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following relationship: 1.5 <f / f1<2.0。

[0009] Furthermore, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 <f1 / f3≤1.0。

[0010] Furthermore, the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 2.0 <f1 / R1<3.0。

[0011] Furthermore, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 2.0≤R1 / R4<3.0.

[0012] Furthermore, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 3.0<(R3+R4) / (R3-R4)<5.0.

[0013] Furthermore, the effective focal length f of the optical imaging lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1.5≤f / R6<-1.0.

[0014] Furthermore, the air distance T23 between the second lens and the third lens on the optical axis and the center thickness CT3 of the third lens satisfy: 1.0 <T23 / CT3≤1.6。

[0015] Furthermore, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens satisfy: 1.0 <V1 / (V2+V3)<1.5。

[0016] Furthermore, the optical imaging lens further includes a reflective mirror E4, which is disposed between the third lens E3 and an imaging surface S9 of the optical imaging lens.

[0017] According to another aspect of the present invention, an optical imaging lens is provided, which includes, in order from the object side to the image side along the optical axis direction of the optical imaging lens: a first lens having positive focal power; a second lens having negative focal power; and a third lens having positive focal power; wherein the effective focal length f of the optical imaging lens satisfies: f>20 mm; and the effective focal length f of the optical imaging lens and the maximum half field of view Semi-FOV of the optical imaging lens satisfy: 2.5 <f*tan(Semi-FOV)<3.5。

[0018] Furthermore, the actual propagation distance of the principal ray from the object side of the first lens to the imaging surface of the optical imaging lens satisfies the following relationship between the equivalent distance TL in air and the entrance pupil diameter EPD of the optical imaging lens: 3.0 <TL / EPD<3.5。

[0019] Furthermore, the effective focal length f3 of the third lens and the equivalent distance FL in the air of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface of the optical imaging lens satisfy the following relationship: 0.6 <f3 / FL≤1.0。

[0020] Furthermore, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following relationship: 1.5 <f / f1<2.0。

[0021] Furthermore, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 <f1 / f3≤1.0。

[0022] Furthermore, the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 2.0 <f1 / R1<3.0。

[0023] Furthermore, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 2.0≤R1 / R4<3.0.

[0024] Furthermore, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 3.0<(R3+R4) / (R3-R4)<5.0.

[0025] Furthermore, the effective focal length f of the optical imaging lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1.5≤f / R6<-1.0.

[0026] Furthermore, the air distance T23 between the second lens and the third lens on the optical axis and the center thickness CT3 of the third lens satisfy: 1.0 <T23 / CT3≤1.6。

[0027] Furthermore, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens satisfy: 1.0 <V1 / (V2+V3)<1.5。

[0028] Furthermore, the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy: -3.0 <f / f2<-2.0。

[0029] Furthermore, the optical imaging lens further includes a reflective mirror E4, which is disposed between the third lens E3 and an imaging surface S9 of the optical imaging lens.

[0030] The technical solution of the present invention is applied, and the optical imaging lens includes a first lens, a second lens and a third lens in order from the object side to the image side along the optical axis direction, wherein the first lens has a positive focal power; the second lens has a negative focal power; and the third lens has a positive focal power; wherein the effective focal length f of the optical imaging lens satisfies: f>20mm; the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy: -3.0 <f / f2<-2.0。

[0031] Through the reasonable arrangement of the optical focal length, astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens can be greatly improved. The use of a positive, negative and positive combination of lenses can better demonstrate the performance of the optical system. The purpose of reasonably controlling the effective focal length f of the optical imaging lens to be greater than 20mm is to meet the focal length requirements of the telephoto end during the zooming process. By reasonably controlling the ratio of the effective focal length f of the optical imaging lens to the effective focal length f2 of the second lens, the optical focal length of the second lens E2 can be effectively controlled to be a negative value, and the optical focal length between each lens can be reasonably distributed to give full play to the optical performance of the optical imaging lens and ensure the imaging quality of the optical imaging lens. In addition, the optical imaging lens of the present invention is a small telephoto lens. During the shooting process, the optical imaging lens can be switched to achieve a zoom effect and realize optical zoom. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 A schematic structural diagram of an optical imaging lens according to Example 1 of the present invention is shown;

[0034] Figures 2 to 5 They are shown respectively Figure 1 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens;

[0035] Figure 6 A schematic structural diagram of an optical imaging lens according to Example 2 of the present invention is shown;

[0036] Figures 7 to 10 They are shown respectively Figure 6 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens;

[0037] Fig.11 A schematic structural diagram of an optical imaging lens according to Example 3 of the present invention is shown;

[0038] Figures 12 to 15 They are shown respectively Fig.11The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens;

[0039] Fig.16 A schematic structural diagram of an optical imaging lens according to Example 4 of the present invention is shown;

[0040] Figures 17 to 20 They are shown respectively Fig.16 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens;

[0041] Fig.21 A schematic structural diagram of an optical imaging lens according to Example 5 of the present invention is shown;

[0042] Figure 22 to Figure 25 They are shown respectively Fig.21 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens.

[0043] The above drawings include the following reference numerals:

[0044] STO, aperture; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, reflector; S7, object side surface of the reflector; S8, image side surface of the reflector; S9, imaging surface. DETAILED DESCRIPTION

[0045] 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 invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0047] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0048] In order to solve the problem of poor imaging quality of camera lenses in the prior art, the present invention provides an optical imaging lens.

[0049] Embodiment 1

[0050] As shown Figures 1 to 25 in the figure, along the optical axis direction of the optical imaging lens from the object side to the image side, it successively includes a first lens E1, a second lens E2, and a third lens E3. The first lens E1 has a positive optical power; the second lens E2 has a negative optical power; the third lens E3 has a positive optical power. Among them, the effective focal length f of the optical imaging lens satisfies: f > 20 mm; the relationship between the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfies: -3.0 < f / f2 < -2.0.

[0051] Through the reasonable arrangement of the optical power, astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens can be greatly improved. Using a combination of positive, negative, and positive lenses can better demonstrate the performance of this optical system. Reasonably controlling the effective focal length f of the optical imaging lens to be greater than 20 mm aims to meet the focal length requirements at the long focal end during the zooming process. By reasonably controlling the ratio of the effective focal length f of the optical imaging lens to the effective focal length f2 of the second lens, the optical power of the second lens E2 can be effectively controlled to be negative, and the optical power can be reasonably distributed among the lenses, giving full play to the optical performance of the optical imaging lens and ensuring the imaging quality of the optical imaging lens. In addition, the optical imaging lens of the present invention is a small long-focus lens, and during shooting, the optical imaging lens can be controlled to switch to achieve a zoom effect and realize optical zoom.

[0052] Preferably, the relationship between the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfies: -2.8 < f / f2 < -2.1.

[0053] In this embodiment, for the principal ray in the optical imaging lens, the equivalent distance TL in air of the actual propagation path from the object side surface of the first lens to the imaging surface of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 3.0 < TL / EPD < 3.5. Preferably, the equivalent distance TL in air of the actual propagation path from the object side surface of the first lens to the imaging surface of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 3.1 < TL / EPD < 3.4. Such a setting is beneficial to increasing the entrance pupil diameter of the optical system, increasing the light input, while reducing the total length of the optical system, effectively reducing the system volume, reducing the space required for assembly, and ensuring the miniaturization of the optical imaging lens.

[0054] In this embodiment, the effective focal length f3 of the third lens and the equivalent distance FL in air of the actual propagation path of the chief ray from the image side of the third lens to the imaging surface of the optical imaging lens satisfy: 0.6 < f3 / FL ≤ 1.0. Preferably, the effective focal length f3 of the third lens and the equivalent distance FL in air of the actual propagation path of the chief ray from the image side of the third lens to the imaging surface of the optical imaging lens satisfy: 0.7 < f3 / FL ≤ 1.0. Such a setting is beneficial to controlling the optical power of the third lens E3 to be positive and is beneficial to improving the imaging quality of the optical imaging lens.

[0055] In this embodiment, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.5 < f / f1 < 2.0. Preferably, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.7 < f / f1 < 1.8. Such a setting is beneficial to controlling the optical power of the first lens E1 to be positive, can constrain the optical power for reasonable distribution, and improve the performance upper limit of the optical imaging lens.

[0056] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 < f1 / f3 ≤ 1.0. Preferably, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.7 ≤ f1 / f3 ≤ 1.0. Such a setting can effectively control the effective focal lengths f1 of the first lens and f3 of the third lens to be close to each other and both be positive values, can effectively and reasonably distribute the optical power, so as to meet the design requirements.

[0057] In this embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 2.0 < f1 / R1 < 3.0. Preferably, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 2.1 ≤ f1 / R1 ≤ 2.6. Such a setting can effectively control the machining included angle of the object side S1 of the first lens, so that the first lens E1 has processability.

[0058] In this embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R4 of the image side of the second lens satisfy: 2.0 ≤ R1 / R4 < 3.0. The radius of curvature R1 of the object side of the first lens and the radius of curvature R4 of the image side of the second lens satisfy: 2.0 ≤ R1 / R4 < 2.8. Since the aperture of the optical imaging lens of the present application is large and the number of lenses is small, such a setting is beneficial to converging light rays and ensuring imaging clarity.

[0059] In this embodiment, the following condition is satisfied between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: 3.0 < (R3 + R4) / (R3 - R4) < 5.0. Preferably, the following condition is satisfied between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: 3.1 < (R3 + R4) / (R3 - R4) < 4.0. Such a setting is conducive to controlling the shape of the second lens E2 to be a negative meniscus shape. Since the first lens E1 and the third lens E3 are both positive lenses, the second lens E2 must be a negative lens to offset the aberration.

[0060] In this embodiment, the following condition is satisfied between the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens: -1.5 ≤ f / R6 < -1.0. Preferably, the following condition is satisfied between the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens: -1.5 ≤ f / R6 ≤ -1.1. Such a setting is conducive to controlling the radius of curvature R6 of the image side surface of the third lens, making the third lens E3 a positive lens to meet the design requirements.

[0061] In this embodiment, the following condition is satisfied between the air spacing T23 on the optical axis between the second lens and the third lens and the central thickness CT3 of the third lens: 1.0 < T23 / CT3 ≤ 1.6. Preferably, the following condition is satisfied between the air spacing T23 on the optical axis between the second lens and the third lens and the central thickness CT3 of the third lens: 1.1 < T23 / CT3 ≤ 1.6. Such a setting is conducive to the air spacing T23 on the optical axis between the second lens and the third lens, and at the same time can control the central thickness CT3 of the third lens, making the optical imaging lens processable.

[0062] In this embodiment, the following condition is satisfied between the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens: 1.0 < V1 / (V2 + V3) < 1.5. Preferably, the following condition is satisfied between the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens: V1 / (V2 + V3) = 1.27. Since it is difficult to optimize the chromatic aberration in the case of only three lenses in a long focal length optical system, the purpose of such a setting is to optimize the chromatic aberration of the optical imaging lens to the best.

[0063] In this embodiment, the effective focal length f of the optical imaging lens and the maximum semi-field of view Semi-FOV of the optical imaging lens satisfy: 2.5 < f * tan(Semi-FOV) < 3.5. Preferably, the effective focal length f of the optical imaging lens and the maximum semi-field of view Semi-FOV of the optical imaging lens satisfy: 2.6 < f * tan(Semi-FOV) < 3.2. In the optical imaging lens, there is a convertible relationship among the focal length, the field of view angle, and the image height. The purpose of such a setting is to enable the optical imaging lens to match a larger chip, thereby obtaining better imaging quality.

[0064] In this embodiment, the optical imaging lens further includes a mirror E4, and the mirror E4 is disposed between the third lens E3 and the imaging surface S9 of the optical imaging lens. Since the back focal length of the optical imaging lens is relatively long, adding the mirror E4 in the optical imaging lens can effectively reduce the volume of the optical imaging lens to meet the requirement of miniaturization.

[0065] Embodiment 2

[0066] The optical imaging lens sequentially includes a first lens E1, a second lens E2, and a third lens E3 along the optical axis direction of the optical imaging lens from the object side to the image side. The first lens E1 has a positive optical power; the second lens E2 has a negative optical power; the third lens E3 has a positive optical power. Among them, the effective focal length f of the optical imaging lens satisfies: f > 20 mm; the effective focal length f of the optical imaging lens and the maximum semi-field of view Semi-FOV of the optical imaging lens satisfy: 2.5 < f * tan(Semi-FOV) < 3.5.

[0067] By reasonably arranging the optical power, astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens can be greatly improved. Using a combination of positive, negative, and positive lenses can better exhibit the performance of this optical system. The purpose of reasonably controlling the effective focal length f of the optical imaging lens to be greater than 20 mm is to meet the focal length requirement at the long focal end during the zooming process. Preferably, the effective focal length f of the optical imaging lens and the maximum semi-field of view Semi-FOV of the optical imaging lens satisfy: 2.6 < f * tan(Semi-FOV) < 3.2. In the optical imaging lens, there is a convertible relationship among the focal length, the field of view angle, and the image height. The purpose of such a setting is to enable the optical imaging lens to match a larger chip, thereby obtaining better imaging quality.

[0068] In this embodiment, the equivalent distance TL in air of the actual propagation path of the chief ray from the object side surface of the first lens to the imaging surface of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 3.0 < TL / EPD < 3.5. Preferably, the equivalent distance TL in air of the actual propagation path of the chief ray from the object side surface of the first lens to the imaging surface of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 3.1 < TL / EPD < 3.4. Such a setting is beneficial to increasing the entrance pupil diameter of the optical system, increasing the amount of incident light, while reducing the total length of the optical system, effectively reducing the system volume, reducing the space required for assembly, and ensuring the miniaturization of the optical imaging lens.

[0069] In this embodiment, the effective focal length f3 of the third lens and the equivalent distance FL in air of the actual propagation path of the chief ray from the image side surface of the third lens to the imaging surface of the optical imaging lens satisfy: 0.6 < f3 / FL ≤ 1.0. Preferably, the effective focal length f3 of the third lens and the equivalent distance FL in air of the actual propagation path of the chief ray from the image side surface of the third lens to the imaging surface of the optical imaging lens satisfy: 0.7 < f3 / FL ≤ 1.0. Such a setting is beneficial to controlling the optical power of the third lens E3 to be positive and beneficial to improving the imaging quality of the optical imaging lens.

[0070] In this embodiment, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.5 < f / f1 < 2.0. Preferably, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.7 < f / f1 < 1.8. Such a setting is beneficial to controlling the optical power of the first lens E1 to be positive, being able to constrain the optical power for reasonable distribution, and improving the performance upper limit of the optical imaging lens.

[0071] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 < f1 / f3 ≤ 1.0. Preferably, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.7 ≤ f1 / f3 ≤ 1.0. Such a setting can effectively control the effective focal length f1 of the first lens and the effective focal length f3 of the third lens to be close and both positive at the same time, can effectively and reasonably distribute the optical power, so as to meet the design requirements.

[0072] In this embodiment, the following condition is satisfied between the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens: 2.0 < f1 / R1 < 3.0. Preferably, the following condition is satisfied between the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens: 2.1 ≤ f1 / R1 ≤ 2.6. Such a setting can effectively control the machining included angle of the object side surface S1 of the first lens, making the first lens E1 machinable.

[0073] In this embodiment, the following condition is satisfied between the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R4 of the image side surface of the second lens: 2.0 ≤ R1 / R4 < 3.0. The following condition is satisfied between the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R4 of the image side surface of the second lens: 2.0 ≤ R1 / R4 < 2.8. Since the aperture of the optical imaging lens of this application is relatively large and the number of lenses is relatively small, such a setting is beneficial to converge light and ensure imaging clarity.

[0074] In this embodiment, the following condition is satisfied between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: 3.0 < (R3 + R4) / (R3 - R4) < 5.0. Preferably, the following condition is satisfied between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: 3.1 < (R3 + R4) / (R3 - R4) < 4.0. Such a setting is beneficial to control the shape of the second lens E2 to be a negative meniscus. Since the first lens E1 and the third lens E3 are both positive lenses, the second lens E2 must be a negative lens to offset the aberration.

[0075] In this embodiment, the following condition is satisfied between the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens: -1.5 ≤ f / R6 < -1.0. Preferably, the following condition is satisfied between the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens: -1.5 ≤ f / R6 ≤ -1.1. Such a setting is beneficial to control the radius of curvature R6 of the image side surface of the third lens, making the third lens E3 a positive lens to meet the design requirements.

[0076] In this embodiment, the following condition is satisfied between the air spacing T23 on the optical axis between the second lens and the third lens and the central thickness CT3 of the third lens: 1.0 < T23 / CT3 ≤ 1.6. Preferably, the following condition is satisfied between the air spacing T23 on the optical axis between the second lens and the third lens and the central thickness CT3 of the third lens: 1.1 < T23 / CT3 ≤ 1.6. Such a setting is beneficial to the air spacing T23 on the optical axis between the second lens and the third lens, and at the same time can control the central thickness CT3 of the third lens, making the optical imaging lens machinable.

[0077] In this embodiment, the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, and the Abbe number V3 of the third lens satisfy: 1.0 < V1 / (V2 + V3) < 1.5. Preferably, the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, and the Abbe number V3 of the third lens satisfy: V1 / (V2 + V3) = 1.27. Since it is difficult to optimize chromatic aberration in a long focal length optical system with only three lenses, the purpose of this setting is to optimize the chromatic aberration of the optical imaging lens to the best.

[0078] In this embodiment, the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy: -3.0 < f / f2 < -2.0. Preferably, the effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy: -2.8 < f / f2 < -2.1. By reasonably controlling the ratio of the effective focal length f of the optical imaging lens to the effective focal length f2 of the second lens, the optical power of the second lens E2 can be effectively controlled to be negative, the optical power between each lens can be reasonably distributed, the optical performance of the optical imaging lens can be fully exerted, and the imaging quality of the optical imaging lens can be guaranteed. In addition, the optical imaging lens of the present invention is a small-sized long focal length lens, and during shooting, the optical imaging lens can be controlled to switch to achieve a zoom effect and realize optical zoom.

[0079] In this embodiment, the optical imaging lens further includes a mirror E4, and the mirror E4 is disposed between the third lens E3 and the imaging surface S9 of the optical imaging lens. Since the back focal length of the optical imaging lens is relatively long, adding the mirror E4 in the optical imaging lens can effectively reduce the volume of the optical imaging lens to meet the miniaturization requirement.

[0080] The optical imaging lens in this application can adopt multiple lenses, such as the three lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial distance between each lens, etc., the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging lens more conducive to production and processing and applicable to portable electronic devices such as smart phones. The above-mentioned optical imaging lens also has the advantages of large aperture, ultra-thin, and good imaging quality, and can meet the miniaturization requirements of intelligent electronic products.

[0081] In this application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0082] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although three lenses are used as an example in the embodiments, the optical imaging lens is not limited to including three lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0083] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0084] It should be noted that any one of the following examples 1 to 5 is applicable to all embodiments of the present application.

[0085] Example 1

[0086] like Figures 1 to 5 As shown, the optical imaging lens of Example 1 of the present application is described. Figure 1 A schematic diagram of the optical imaging lens structure of Example 1 is shown.

[0087] like Figure 1 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a reflector E4 and an imaging surface S9.

[0088] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The reflector E4 has an object side surface S7 of the reflector and an image side surface S8 of the reflector. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0089] In this example, the total effective focal length f of the optical imaging lens is 26.09 mm, and the relative aperture Fno of the optical imaging lens is 3.3.

[0090] Table 1 shows a basic structural parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0091]

[0092] Table 1

[0093] In Example 1, the object side surface and the image side surface of any lens from 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:

[0094]

[0095] Wherein, x 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 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspheric mirror surface S1-S6 in Example 1.

[0096]

[0097]

[0098] Table 2

[0099] Figure 2 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 after passing through the optical imaging lens. Figure 3 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 4 The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 5 The magnification 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 optical imaging lens.

[0100] according to Figures 2 to 5 It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] like Figures 6 to 10 As shown, the optical imaging lens of Example 2 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Figure 6 A schematic structural diagram of the optical imaging lens of Example 2 is shown.

[0103] like Figure 6 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a reflector E4 and an imaging surface S9.

[0104] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The reflector E4 has an object side surface S7 of the reflector and an image side surface S8 of the reflector. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0105] In this example, the total effective focal length f of the optical imaging lens is 25 mm, and the relative aperture Fno of the optical imaging lens is 3.4.

[0106] Table 3 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0107]

[0108]

[0109] Table 3

[0110] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0111] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.5454E-01 -3.1364E-02 -3.7850E-03 -7.3851E-03 -6.1899E-04 -8.1127E-04 -7.7071E-05 S2 4.3260E-01 -6.5305E-02 -5.4048E-03 -7.6665E-03 1.8850E-04 -1.0533E-03 1.8993E-04 S3 -8.7388E-01 1.0395E-01 -2.5983E-02 8.9453E-03 -5.1489E-03 9.1496E-04 -5.2417E-04 S4 -6.2898E-01 1.0479E-01 -2.0364E-02 1.2442E-02 -4.2223E-03 1.8047E-03 -3.5033E-05 S5 1.9956E-01 -3.3230E-02 -9.9769E-03 -1.7185E-04 -2.0971E-03 1.3732E-04 4.6887E-04 S6 1.7200E-01 -2.0911E-02 -7.3880E-03 -1.8806E-03 -1.1550E-03 5.3835E-05 2.8858E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -4.2018E-05 3.8802E-05 -4.7304E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 3.1007E-04 -3.5199E-04 -3.7194E-07 -1.9869E-05 4.6428E-05 0.0000E+00 0.0000E+00 S3 1.1993E-04 -4.9254E-04 1.2782E-04 -6.5535E-05 4.4889E-05 0.0000E+00 0.0000E+00 S4 2.9573E-05 -1.8809E-04 4.8807E-05 -3.0565E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 -5.5230E-05 -5.7148E-05 -4.1420E-05 1.2251E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 -7.0289E-05 -2.3639E-05 -2.6609E-05 1.6421E-05 0.0000E+00 0.0000E+00 0.0000E+00

[0112] Table 4

[0113] Figure 7 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 after passing through the optical imaging lens. Figure 8 The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 9 The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.10 The magnification 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 optical imaging lens.

[0114] according to Figures 7 to 10 It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0115] Example 3

[0116] like Figures 11 to 15As shown, the optical imaging lens of Example 3 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.11 A schematic structural diagram of the optical imaging lens of Example 3 is shown.

[0117] like Fig.11 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a reflector E4 and an imaging surface S9.

[0118] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The reflector E4 has an object side surface S7 of the reflector and an image side surface S8 of the reflector. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0119] In this example, the total effective focal length f of the optical imaging lens is 24.90 mm, and the relative aperture Fno of the optical imaging lens is 3.2.

[0120] Table 5 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0121]

[0122] Table 5

[0123] Table 6 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0124]

[0125]

[0126] Table 6

[0127] Fig.12 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 after passing through the optical imaging lens. Fig.13 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14 The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.15The magnification 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 optical imaging lens.

[0128] according to Figures 12 to 15 It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0129] Example 4

[0130] like Figures 16 to 20 As shown, the optical imaging lens of Example 4 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.16 A schematic structural diagram of the optical imaging lens of Example 4 is shown.

[0131] like Fig.16 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a reflector E4 and an imaging surface S9.

[0132] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The reflector E4 has an object side surface S7 of the reflector and an image side surface S8 of the reflector. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0133] In this example, the total effective focal length f of the optical imaging lens is 24.90 mm, and the relative aperture Fno of the optical imaging lens is 3.2.

[0134] Table 7 shows a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0135]

[0136] Table 7

[0137] Table 8 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 4, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0138] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.2496E-01 -5.4257E-03 -2.6069E-03 -6.0148E-03 -1.1621E-03 -1.2587E-03 -5.0606E-05 S2 5.8303E-01 -5.9115E-02 -6.8803E-03 -5.7016E-03 -1.3723E-03 -6.6194E-04 2.2518E-04 S3 -9.6018E-01 7.3115E-02 -1.1404E-02 6.0901E-03 -2.9814E-03 1.2393E-03 -7.7051E-04 S4 -7.1917E-01 7.4261E-02 -1.0591E-02 7.4953E-03 -2.6018E-03 1.8866E-03 -5.9035E-04 S5 1.9933E-01 -2.7667E-02 -2.9178E-03 1.5580E-03 -1.4402E-03 6.1329E-04 -1.2864E-04 S6 1.7137E-01 -2.2022E-03 -1.1249E-03 -1.2654E-04 -8.3758E-04 1.6466E-04 -8.1917E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.2025E-04 1.2805E-04 -1.8157E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 4.4126E-04 6.2165E-05 -1.1288E-04 1.0709E-05 -3.2381E-08 0.0000E+00 0.0000E+00 S3 6.3229E-04 -3.0066E-04 6.6475E-05 1.1107E-05 -6.8690E-06 0.0000E+00 0.0000E+00 S4 5.7397E-04 -3.6231E-04 8.9237E-05 -7.9823E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 3.3166E-04 -1.5809E-04 -1.8639E-05 9.6252E-06 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.2576E-04 -7.3799E-05 -6.3443E-06 5.5960E-06 0.0000E+00 0.0000E+00 0.0000E+00

[0139] Table 8

[0140] Fig.17The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.18 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.19 The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 20 The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0141] according to Figures 17 to 20 It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0142] Example 5

[0143] like Figure 21 to Figure 25 As shown, the optical imaging lens of Example 5 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.21 A schematic structural diagram of the optical imaging lens of Example 5 is shown.

[0144] like Fig.21 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a reflector E4 and an imaging surface S9.

[0145] The first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The reflector E4 has an object side surface S7 of the reflector and an image side surface S8 of the reflector. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0146] In this example, the total effective focal length f of the optical imaging lens is 25.20 mm, and the relative aperture Fno of the optical imaging lens is 3.3.

[0147] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0148]

[0149] Table 9

[0150] Table 10 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, where each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0151] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.1376E-01 -9.5760E-03 -5.0461E-03 -7.4008E-03 -1.5441E-03 -1.2825E-03 -1.1528E-05 S2 5.6147E-01 -6.6027E-02 -8.7385E-03 -7.2451E-03 -1.0623E-03 -6.1076E-04 3.4537E-04 S3 -9.5439E-01 7.7585E-02 -1.1183E-02 6.3707E-03 -3.0387E-03 1.1739E-03 -7.8784E-04 S4 -7.1856E-01 7.8648E-02 -1.0657E-02 8.3570E-03 -2.7322E-03 1.8613E-03 -6.9120E-04 S5 2.0619E-01 -2.6543E-02 -3.9188E-03 1.3813E-03 -1.5505E-03 5.8117E-04 -1.8789E-04 S6 1.6835E-01 -2.1344E-03 -2.5151E-03 -5.7639E-04 -9.4115E-04 1.5172E-04 -8.5423E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.1095E-04 1.3442E-04 -2.0382E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 3.8406E-04 8.2631E-05 -1.3427E-04 1.1752E-05 9.1107E-07 0.0000E+00 0.0000E+00 S3 6.2779E-04 -2.9311E-04 7.5303E-05 3.5707E-06 -6.3021E-06 0.0000E+00 0.0000E+00 S4 5.7578E-04 -3.5874E-04 1.0105E-04 -9.9643E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.9283E-04 -1.5781E-04 -1.1542E-05 1.1706E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.1441E-04 -6.5525E-05 -4.7775E-06 5.5983E-06 0.0000E+00 0.0000E+00 0.0000E+00

[0152] Table 10

[0153] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0154]

[0155]

[0156] Table 11

[0157] Table 12 shows the effective focal length f of the optical imaging lens of Examples 1 to 5, the effective focal length f1 to f3 of each lens, and the relative aperture Fno of the optical imaging lens.

[0158] Parameters / Examples 1 2 3 4 5 f1(mm) 14.78 14.46 14.03 13.94 14.15 f2(mm) -11.94 -10.37 -9.19 -9.58 -9.36 f3(mm) 20.98 16.69 14.40 15.47 14.75 f(mm) 26.09 25.00 24.90 24.90 25.20 Fno 3.3 3.4 3.2 3.2 3.3

[0159] Table 12

[0160] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0161] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0162] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0163] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0164] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens has three lenses with optical power, which include: a first lens, wherein the first lens has positive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface; a second lens, wherein the second lens has negative optical power, an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a concave surface; a third lens having positive optical power, an object-side surface of the third lens being a convex surface, and an image-side surface of the third lens being a convex surface; The effective focal length f of the optical imaging lens satisfies: 20 mm <f≤26.09mm; The effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens satisfy the following: -2.71≤f / f2≤-2.19; The effective focal length f3 of the third lens and the equivalent distance FL of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface of the optical imaging lens in the air satisfy the following conditions: 0.7 <f3 / FL≤1.0。 2. The optical imaging lens according to claim 1, wherein: The actual propagation distance of the principal light in the optical imaging lens from the object side surface of the first lens to the imaging surface of the optical imaging lens satisfies the following relationship between the equivalent distance TL in air and the entrance pupil diameter EPD of the optical imaging lens: 3.12≤TL / EPD≤3.

36.

3. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.7 <f / f1<1.8。 4. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy the following: 0.70≤f1 / f3≤1.

0.

5. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the curvature radius R1 of the object-side surface of the first lens satisfy: 2.1≤f1 / R1≤2.

6.

6. The optical imaging lens according to claim 1, wherein: A curvature radius R1 of the object-side surface of the first lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 2.06≤R1 / R4≤2.

71.

7. The optical imaging lens according to claim 1, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy the following relationship: 3.17≤(R3+R4) / (R3-R4)≤3.

94.

8. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1.45≤f / R6≤-1.

10.

9. An optical imaging lens, characterized in that: The optical imaging lens has three lenses with optical power, which include: a first lens, wherein the first lens has positive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface; a second lens, wherein the second lens has negative optical power, an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a concave surface; a third lens having positive optical power, an object-side surface of the third lens being a convex surface, and an image-side surface of the third lens being a convex surface; The effective focal length f of the optical imaging lens satisfies: 20 mm <f≤26.09mm; The effective focal length f of the optical imaging lens and the maximum half field of view Semi-FOV of the optical imaging lens satisfy the following relationship: 2.69≤f*tan(Semi-FOV)≤3.19; The effective focal length f3 of the third lens and the equivalent distance FL of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface of the optical imaging lens in the air satisfy the following conditions: 0.7 <f3 / FL≤1.0。

Images