Optical imaging lens

Abstract

The application provides an optical imaging lens, which comprises, in sequence from the object side to the image side of the optical imaging lens: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power, the object side surface of the third lens being a convex surface, and the image side surface of the third lens being a concave surface; and a fourth lens with positive refractive power, the object side surface of the fourth lens being a convex surface, and the image side surface of the fourth lens being a concave surface; wherein the following conditions are met: 0 < (R5+R6) / f3 < 6, where R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and f3 is the effective focal length of the third lens; V4 / V3 > 1, where V4 is the Abbe number of the fourth lens, and V3 is the Abbe number of the third lens; and 3

Description

TECHNICAL FIELD

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

[0002] With the progress of science and technology, the technical innovation of mobile phone camera of major mobile phone manufacturers is also in full swing, and further pursuit of higher performance of mobile phone camera in all aspects. In recent years, long focus has become one of the focuses of major manufacturers. However, the rear lens of the existing four-piece optical imaging lens, especially the third lens and the fourth lens, needs to bear more correction functions of aberration, chromatic aberration and the like, and the lens surface type is relatively complex, and the processing difficulty is high. Therefore, how to design the shape and optical parameters of the rear lens of the optical imaging lens so that the optical imaging lens has good processing performance while meeting high image quality is a relatively difficult problem. SUMMARY

[0003] The main purpose of the present application is to provide an optical imaging lens to solve the problem that the high image quality and processability of the optical imaging lens in the prior art are difficult to be considered.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical imaging lens is provided, the optical imaging lens has only four lenses, the four lenses are all plastic materials, and sequentially include: a first lens, the first lens has positive refractive power, the object side surface of the first lens and the image side surface of the first lens are both aspheric surfaces; a second lens, the second lens has negative refractive power, the object side surface of the second lens and the image side surface of the second lens are both aspheric surfaces; a third lens, the third lens has positive refractive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens, the fourth lens has positive refractive power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; wherein the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0<(R5+R6) / f3<6; the Abbe number V4 of the fourth lens and the Abbe number V3 of the third lens satisfy: V4 / V3>1; the central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens and the air gap T34 of the third lens and the fourth lens on the optical axis satisfy: 3<CT4 / T34<8.

[0005] Further, the air gap of the third lens and the fourth lens on the optical axis is the smallest among the air gaps of all adjacent two lenses on the optical axis, and the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.6<(R5+R6) / (R7+R8)<7.1.

[0006] Further, an air gap T12 on the optical axis between the first lens and the second lens, an air gap T23 on the optical axis between the second lens and the third lens satisfy: 0.2 < T12 / T23 < 3.

[0007] Further, a distance BFL on the optical axis from the image side surface of the fourth lens to the imaging plane of the optical imaging lens, a central thickness CT4 on the optical axis of the fourth lens satisfy: 7.17 ≤ BFL / CT4 < 18.

[0008] Further, an effective focal length f3 of the third lens, an effective focal length f of the optical imaging lens satisfy: 0 < f3 / f < 1.8.

[0009] Further, a total sum ∑AT of air gaps on the optical axis of any two adjacent lenses, an air gap T23 on the optical axis between the second lens and the third lens satisfy: 1.5 < ∑AT / T23 < 4.5.

[0010] Further, an effective focal length f4 of the fourth lens, an effective focal length f of the optical imaging lens satisfy: 0 < f4 / f < 2.

[0011] Further, a curvature radius R1 of the object side surface of the first lens, a central thickness CT1 on the optical axis of the first lens satisfy: 1.8 < R1 / CT1 < 4.

[0012] Further, an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a curvature radius R4 of the image side surface of the second lens satisfy: 0 < (f1+f2) / R4 < 2.

[0013] Further, an edge thickness ET1 at the maximum effective diameter of the first lens, an edge thickness ET2 at the maximum effective diameter of the second lens satisfy: 1 < ET2 / ET1 < 4.

[0014] Further, a central thickness CT1 on the optical axis of the first lens, an edge thickness ET1 at the maximum effective diameter of the first lens satisfy: 2.04 ≤ CT1 / ET1 < 4.2.

[0015] Further, among the four lenses, the number of lenses with Abbe number greater than 50 is equal to the number of lenses with Abbe number less than 50.

[0016] Further, an effective half aperture DT11 of the object side surface of the first lens, an effective half aperture DTN1 of the object side surface of the Nth lens satisfy: DT11 / DTN1 > 1, where N takes 2, 3, 4.

[0017] Further, a central thickness CT4 of the fourth lens on the optical axis, an on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens satisfy: 0 < CT4 / SAG41 < 2.

[0018] Further, a maximum value Nmax of the refractive index of all the lenses is less than 1.7, and a maximum value Vmax of the Abbe number of all the lenses is less than 60.

[0019] Further, a distance BFL on the optical axis between the image side surface of the fourth lens and the imaging surface of the optical imaging lens, and a sum CT of the central thicknesses of all the lenses on the optical axis satisfy: 1 < BFL / CT < 3.5.

[0020] According to another aspect of the present application, there is provided an optical imaging lens, the optical imaging lens comprising a plurality of imaging lens groups, an optical axis of the optical imaging lens comprising an X axis and a Y axis perpendicular to each other, the optical imaging lens comprising in order from an object side to an image side thereof: a first imaging lens group, the first imaging lens group being distributed along the X axis, the first imaging lens group comprising in order from the object side to the image side thereof a first lens to a fourth lens, the third lens and the fourth lens each having positive refractive power; a second imaging lens group, the second imaging lens group comprising in order from the object side to the image side thereof a prism distributed along the X axis and a parallel plate distributed along the Y axis, the prism being cemented with the parallel plate; wherein an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens, and an effective focal length f of the optical imaging lens satisfy: TTL / f < 1.2.

[0021] Further, a radius of curvature R5 of the object side surface of the third lens, a radius of curvature R6 of the image side surface of the third lens, and an effective focal length f3 of the third lens satisfy: 0 < (R5+R6) / f3 < 6.

[0022] Further, an Abbe number V4 of the fourth lens and an Abbe number V3 of the third lens satisfy: V4 / V3 > 1.

[0023] Further, a central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens, and an air separation T34 of the third lens and the fourth lens on the optical axis satisfy: 3 < CT4 / T34 < 8.

[0024] Further, the air separation of the third lens and the fourth lens on the optical axis is the smallest among the air separations of all the adjacent two lenses on the optical axis, and a radius of curvature R5 of the object side surface of the third lens, a radius of curvature R6 of the image side surface of the third lens, a radius of curvature R7 of the object side surface of the fourth lens, and a radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.6 < (R5+R6) / (R7+R8) < 7.1.

[0025] Further, an air separation T12 of the first lens and the second lens on the optical axis, an air separation T23 of the second lens and the third lens on the optical axis satisfy: 0.2 < T12 / T23 < 3.

[0026] Further, a distance BFL of the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis satisfy: 7.17 ≤ BFL / CT4 < 18.

[0027] Further, an effective focal length f3 of the third lens, an effective focal length f of the optical imaging lens satisfy: 0 < f3 / f < 1.8.

[0028] Further, a total sum ∑AT of the air separations of any two adjacent lenses on the optical axis, an air separation T23 of the second lens and the third lens on the optical axis satisfy: 1.5 < ∑AT / T23 < 4.5.

[0029] Further, an effective focal length f4 of the fourth lens, an effective focal length f of the optical imaging lens satisfy: 0 < f4 / f < 2.

[0030] Further, a curvature radius R1 of the object side surface of the first lens, a central thickness CT1 of the first lens on the optical axis satisfy: 1.8 < R1 / CT1 < 4.

[0031] Further, an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a curvature radius R4 of the image side surface of the second lens satisfy: 0 < (f1+f2) / R4 < 2.

[0032] Further, an edge thickness ET1 at the maximum effective diameter of the first lens, an edge thickness ET2 at the maximum effective diameter of the second lens satisfy: 1 < ET2 / ET1 < 4.

[0033] Further, a central thickness CT1 of the first lens on the optical axis, an edge thickness ET1 at the maximum effective diameter of the first lens satisfy: 2.04 ≤ CT1 / ET1 < 4.2.

[0034] Further, among the first lens to the fourth lens, the number of lenses with Abbe number greater than 50 is equal to the number of lenses with Abbe number less than 50.

[0035] Further, an effective half aperture DT11 of the object side surface of the first lens, an effective half aperture DTN1 of the object side surface of the Nth lens satisfy: DT11 / DTN1 > 1, where N takes 2, 3, 4.

[0036] Further, a central thickness CT4 of the fourth lens on the optical axis, an on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens satisfy: 0 < CT4 / SAG41 < 2.

[0037] Further, a maximum value Nmax of the refractive index of all the lenses is less than 1.7, and a maximum value Vmax of the Abbe number of all the lenses is less than 60.

[0038] Further, a distance BFL of the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, and a sum CT of the central thicknesses of all the lenses on the optical axis satisfy: 1 < BFL / ∑CT < 3.5.

[0039] Further, the first lens has positive refractive power; and / or the second lens has negative refractive power; and / or the object side surface of the third lens is convex; and / or the image side surface of the third lens is concave; and / or the object side surface of the fourth lens is convex; and / or the image side surface of the fourth lens is concave.

[0040] The optical imaging lens has only four lenses, and the four lenses are all made of plastic material, sequentially including, from the object side to the image side of the optical imaging lens: a first lens having positive refractive power, the object side surface and the image side surface of the first lens are both aspheric surfaces; a second lens having negative refractive power, the object side surface and the image side surface of the second lens are both aspheric surfaces; a third lens having positive refractive power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; and a fourth lens having positive refractive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; wherein the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0 < (R5+R6) / f3 < 6; the Abbe number V4 of the fourth lens and the Abbe number V3 of the third lens satisfy: V4 / V3 > 1; and the central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens and the air gap T34 of the third lens and the fourth lens on the optical axis satisfy: 3 < CT4 / T34 < 8.

[0041] The present application controls the refractive power, surface type, R5, R6, f3, V4, V3, CT4, and T34 of each lens, improves the aberration and chromatic aberration of the optical imaging lens, improves the imaging quality, reduces the processing difficulty of the third lens and the fourth lens, reduces the deflection angle of light at the third lens and the fourth lens, thereby reducing the lens sensitivity, uses the plastic material lens to effectively reduce the cost, and realizes the complex surface of the high order term by injection molding, thereby improving the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0042] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0043] Figure 1 A schematic diagram of the structure of an optical imaging lens of Example 1 of the present invention is shown;

[0044] Figures 2 to 5 They are shown respectively Figure 1 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in the image;

[0045] Figure 6 A schematic diagram of the structure of the optical imaging lens of Example 2 of the present invention is shown;

[0046] Figures 7 to 10 They are shown respectively Figure 6 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in the image;

[0047] Figure 11 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention is shown;

[0048] Figures 12 to 15 They are shown respectively Figure 11 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in the image;

[0049] Figure 16 A schematic diagram of the structure of the optical imaging lens of Example 4 of the present invention is shown;

[0050] Figures 17 to 20 They are shown respectively Figure 16 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in the image;

[0051] Figure 21 A schematic diagram of the structure of the optical imaging lens of Example 5 of the present invention is shown;

[0052] Figures 22 to 25 They are shown respectively Figure 21 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in the image;

[0053] Figure 26 A schematic diagram of the structure of the optical imaging lens of Example Six of the present invention is shown;

[0054] Figures 27 to 30 They are shown respectively Figure 26The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens.

[0055] The above figures include the following reference numerals:

[0056] STO, Aperture Stop; E1, First Lens; S1, Object-side Face of First Lens; S2, Image-side Face of First Lens; E2, Second Lens; S3, Object-side Face of Second Lens; S4, Image-side Face of Second Lens; E3, Third Lens; S5, Object-side Face of Third Lens; S6, Image-side Face of Third Lens; E4, Fourth Lens; S7, Object-side Face of Fourth Lens; S8, Image-side Face of Fourth Lens; P1, Prism; P2, Parallel Plate; S9, Object-side Face of Filter; S10, Image-side Face of Filter; S11, Imaging Surface. Detailed Implementation

[0057] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0058] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0059] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0060] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0061] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0062] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 is called the object-side surface of the lens, and the surface of each lens closest to the image side is called the image-side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0063] To address the challenge of balancing high image quality and manufacturability in existing optical imaging lenses, this invention provides an optical imaging lens.

[0064] Example 1

[0065] like Figures 1 to 30 As shown, the optical imaging lens has only four lenses, all made of plastic. From the object side to the image side, the lenses are sequentially a first lens, a second lens, a third lens, and a fourth lens. The first lens has positive optical power, and both its object-side and image-side surfaces are aspherical. The second lens has negative optical power, and both its object-side and image-side surfaces are aspherical. The third lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The fourth lens has positive optical power... The fourth lens has a convex object-side surface and a concave image-side surface. The radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the effective focal length f3 of the third lens satisfy the following: 0 < (R5 + R6) / f3 < 6. The Abbe number V4 of the fourth lens and the Abbe number V3 of the third lens satisfy the following: V4 / V3 > 1. The center thickness CT4 of the fourth lens on the optical axis of the imaging lens and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following: 3. <CT4 / T34<8。

[0066] This application improves the aberrations and chromatic aberrations of optical imaging lenses by controlling the optical power, surface shape, and R5, R6, f3, V4, V3, CT4, and T34 of each lens, thereby enhancing image quality. It also reduces the manufacturing difficulty of the third and fourth lenses, resulting in smaller deflection angles of light at the third and fourth lenses, thus reducing lens sensitivity. At the same time, the use of plastic lenses effectively reduces costs, and injection molding can achieve complex surface shapes with higher orders, further improving image quality.

[0067] Preferably, the following condition is met among the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens: 0.5 < (R5+R6) / f3 < 5.5.

[0068] Preferably, the following condition is met among the Abbe number V4 of the fourth lens and the Abbe number V3 of the third lens: 1.1 < V4 / V3 < 3.0.

[0069] Preferably, the following condition is met among the central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens, and the air separation T34 of the third lens and the fourth lens on the optical axis: 3.5 < CT4 / T34 < 7.5.

[0070] In the embodiment, the air separation of the third lens and the fourth lens on the optical axis is the smallest among the air separations of all adjacent two pieces of lenses on the optical axis, and the following condition is met among the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens: 1.6 < (R5+R6) / (R7+R8) < 7.1. By limiting (R5+R6) / (R7+R8) within a reasonable range, the reasonable distribution of the curvature radius is conducive to weakening the sensitivity of the optical imaging lens, conducive to achieving high resolution characteristics, while ensuring good processability; the smaller air separation of the third lens and the fourth lens on the optical axis is conducive to compressing the overall height of the optical imaging lens, and conducive to assembly. Preferably, 1.8 < (R5+R6) / (R7+R8) < 7.0.

[0071] In the embodiment, the following condition is met among the air separation T12 of the first lens and the second lens on the optical axis, and the air separation T23 of the second lens and the third lens on the optical axis: 0.2 < T12 / T23 < 3. By limiting T12 / T23 within a reasonable range, the size of the optical imaging lens can be effectively reduced, avoiding the volume of the optical imaging lens being too large, while reducing the assembly difficulty of the lens and achieving a higher space utilization. Preferably, 0.3 < T12 / T23 < 2.9.

[0072] In the embodiment, the following condition is met among the distance BFL of the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis: 7.17 ≤ BFL / CT4 < 18. By limiting BFL / CT4 within a reasonable range, a larger value of BFL is conducive to improving the focal length and further improving the long-focus zoom ratio. Preferably, 7.17 ≤ BFL / CT4 < 17.50.

[0073] In the embodiment, the effective focal length f3 of the third lens and the effective focal length f of the optical imaging lens satisfy: 0 < f3 / f < 1.8. By limiting f3 / f to a reasonable range, the aberration generated by the lens group at the rear end can be balanced, and thus good imaging quality and high resolving power can be achieved. Preferably, 0.2 < f3 / f < 1.5.

[0074] In the embodiment, the sum ∑AT of the air intervals of any two adjacent lenses on the optical axis and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 1.5 < ∑AT / T23 < 4.5. By limiting ∑AT / T23 to a reasonable range, the air gap of the optical imaging lens can be reasonably distributed, the processing and assembly characteristics can be ensured, and problems such as interference between front and rear lenses during assembly caused by too small gap can be avoided. Preferably, 1.6 < ∑AT / T23 < 4.4.

[0075] In the embodiment, the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 0 < f4 / f < 2. By limiting f4 / f to a reasonable range, a smaller exit angle can be controlled, and the matching with the photosensitive element and the band-pass filter can be increased. Preferably, 0.5 < f4 / f < 1.5.

[0076] In the embodiment, the curvature radius R1 of the object side surface of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.8 < R1 / CT1 < 4. By limiting R1 / CT1 to a reasonable range, the first lens can be prevented from being too curved, the deflection angle of light on the first lens can be reduced, the surface optical sensitivity and the tilt sensitivity of the first lens can be reduced, and the molding and surface stability can be improved. Preferably, 1.9 < R1 / CT1 < 3.8.

[0077] In the embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 0 < (f1+f2) / R4 < 2. By limiting (f1+f2) / R4 to a reasonable range, the second lens can be prevented from being too curved, the surface optical sensitivity can be reduced, and the molding and surface stability can be improved. Preferably, 0.5 < (f1+f2) / R4 < 1.8.

[0078] In the embodiment, the edge thickness ET1 of the first lens at the maximum effective diameter and the edge thickness ET2 of the second lens at the maximum effective diameter satisfy: 1 < ET2 / ET1 < 4. By limiting ET2 / ET1 to a reasonable range, the edge thicknesses of the first lens and the second lens are reasonably distributed, the lenses are easy to be injection molded, and the processability of the optical imaging lens is improved. Preferably, 1.1 < ET2 / ET1 < 3.8.

[0079] In the embodiment, the center thickness CT1 of the first lens on the optical axis, the edge thickness ET1 of the first lens at the maximum effective diameter satisfy: 2.04≤CT1 / ET1<4.2. By limiting CT1 / ET1 within a reasonable range, the processability of the first lens can be ensured, and the yield can be improved. Preferably, 2.04≤CT1 / ET1<4.00.

[0080] In the embodiment, among the four lenses, the number of lenses with Abbe number greater than 50 is equal to the number of lenses with Abbe number less than 50. Reasonable distribution of low-refractive and high-refractive lens materials is conducive to balancing the off-axis chromatic aberration between lenses and obtaining better imaging quality.

[0081] In the embodiment, the effective half aperture DT11 of the object side of the first lens, the effective half aperture DTN1 of the object side of the Nth lens satisfy: DT11 / DTN1>1, where N is 2, 3, 4. By limiting DT11 / DTN1 within a reasonable range, the larger effective half aperture of the first lens is conducive to realizing a larger light flux, which can improve the resolving power of the system. Preferably, 1.05<DT11 / DTN1<1.50.

[0082] In the embodiment, the center thickness CT4 of the fourth lens on the optical axis, the on-axis distance SAG41 between the intersection of the object side of the fourth lens and the optical axis and the effective radius vertex of the object side of the fourth lens satisfy: 0<CT4 / SAG41<2. By limiting CT4 / SAG41 within a reasonable range, the fourth lens is prevented from being too curved, reducing the processing difficulty, while the optical imaging lens has better balanced chromatic aberration and distortion. Preferably, 0.5<CT4 / SAG41<1.8.

[0083] In the embodiment, the maximum value Nmax of the refractive index of all lenses is less than 1.7, and the maximum value Vmax of the Abbe number of all lenses is less than 60. The materials used by each lens are common materials in plastic materials, which are easy to process, can realize the characteristics of light and thin optical imaging lens, and have low cost, which can save production cost.

[0084] In the embodiment, the distance BFL of the image side of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, the sum ∑CT of the center thicknesses of all lenses on the optical axis satisfy: 1<BFL / ∑CT<3.5. By limiting BFL / ∑CT within a reasonable range, a larger value of BFL is conducive to improving the focal length and further improving the long focal zoom ratio. Preferably, 1.2<BFL / ∑CT<3.2.

[0085] Embodiment two

[0086] As Figures 1 to 30As shown, the optical imaging lens comprises a plurality of imaging lens groups, an optical axis of the optical imaging lens comprises an X axis and a Y axis perpendicular to each other, the optical imaging lens comprises a first imaging lens group and a second imaging lens group in sequence from an object side to an image side of the optical imaging lens, the first imaging lens group is distributed along the X axis, the first imaging lens group comprises a first lens to a fourth lens in sequence from the object side to the image side of the optical imaging lens, the third lens and the fourth lens both have positive focal power; the second imaging lens group comprises a prism distributed along the X axis and a parallel flat plate distributed along the Y axis in sequence from the object side to the image side of the optical imaging lens, the prism is cemented with the parallel flat plate; wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens and an effective focal length f of the optical imaging lens satisfy: TTL / f < 1.2.

[0087] The present application can effectively fold light rays by arranging the prism in the second imaging lens group, so as to achieve the purpose of reducing the height of the lens. The parallel flat plate cemented with the prism can weaken the stray light related to the reflecting surface of the prism, and improve the imaging quality. By keeping TTL / f within a reasonable range, the overall height of the lens can be reduced while ensuring the imaging quality.

[0088] Wherein, after the light rays pass through the folding effect of the prism, the optical axis is changed from the X axis to the Y axis perpendicular thereto, thereby reducing the height of the lens in the X axis direction, so as to realize the miniaturization and thinness of the optical imaging lens.

[0089] Preferably, an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens and an effective focal length f of the optical imaging lens satisfy: 1.0 < TTL / f < 1.8.

[0090] In the present embodiment, a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, and an effective focal length f3 of the third lens satisfy: 0 < (R5+R6) / f3 < 6. By limiting (R5+R6) / f3 within a reasonable range, the aberration of the optical imaging lens can be improved, the imaging quality can be improved, and the processing difficulty of the third lens can be reduced. Preferably, 0.5 < (R5+R6) / f3 < 5.5.

[0091] In the present embodiment, an Abbe number V4 of the fourth lens and an Abbe number V3 of the third lens satisfy: V4 / V3 > 1. By limiting V4 / V3 within a reasonable range, the chromatic aberration can be reduced. Preferably, 1.1 < V4 / V3 < 3.0.

[0092] In the embodiment, the central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens, and the air gap T34 of the third lens and the fourth lens on the optical axis satisfy: 3 < CT4 / T34 < 8. By limiting CT4 / T34 within a reasonable range, a smaller light deflection angle is facilitated to reduce the sensitivity of the third lens and the fourth lens. Preferably, 3.5 < CT4 / T34 < 7.5.

[0093] In the embodiment, the air gap of the third lens and the fourth lens on the optical axis is the smallest among the air gaps of all adjacent two lenses on the optical axis, and the curvature radius R5 of the object side of the third lens, the curvature radius R6 of the image side of the third lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R8 of the image side of the fourth lens satisfy: 1.6 < (R5+R6) / (R7+R8) < 7.1. By limiting (R5+R6) / (R7+R8) within a reasonable range, a reasonable distribution of the curvature radius facilitates to weaken the sensitivity of the optical imaging lens, facilitates to achieve high resolution characteristics, while ensuring good processability; the smaller air gap of the third lens and the fourth lens on the optical axis facilitates to compress the overall height of the optical imaging lens, and facilitates assembly. Preferably, 1.8 < (R5+R6) / (R7+R8) < 7.0.

[0094] In the embodiment, the air gap T12 of the first lens and the second lens on the optical axis, and the air gap T23 of the second lens and the third lens on the optical axis satisfy: 0.2 < T12 / T23 < 3. By limiting T12 / T23 within a reasonable range, the size of the optical imaging lens can be effectively reduced to avoid the volume of the optical imaging lens being too large, while reducing the assembly difficulty of the lenses and achieving a higher space utilization. Preferably, 0.3 < T12 / T23 < 2.9.

[0095] In the embodiment, the distance BFL of the image side of the fourth lens to the imaging plane of the optical imaging lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 7.17 ≤ BFL / CT4 < 18. By limiting BFL / CT4 within a reasonable range, a larger value of BFL is maintained to facilitate to improve the focal length and further improve the long-focus zoom ratio. Preferably, 7.17 ≤ BFL / CT4 < 17.50.

[0096] In the embodiment, the effective focal length f3 of the third lens, and the effective focal length f of the optical imaging lens satisfy: 0 < f3 / f < 1.8. By limiting f3 / f within a reasonable range, the aberration generated by the lens group at the rear end can be balanced, and then a good imaging quality is obtained to achieve high resolution performance. Preferably, 0.2 < f3 / f < 1.5.

[0097] In the embodiment, the sum of air gaps of any two adjacent lenses on the optical axis ∑AT, the air gap T23 between the second lens and the third lens on the optical axis satisfy: 1.5 < ∑AT / T23 < 4.5. By limiting ∑AT / T23 in a reasonable range, the air gaps of the optical imaging lens can be reasonably distributed, the processing and assembly characteristics can be ensured, and problems such as interference between front and rear lenses in the assembly process caused by too small gaps can be avoided. Preferably, 1.6 < ∑AT / T23 < 4.4.

[0098] In the embodiment, the effective focal length f4 of the fourth lens, the effective focal length f of the optical imaging lens satisfy: 0 < f4 / f < 2. By limiting f4 / f in a reasonable range, a smaller exit angle can be controlled, and the matching with the photosensitive element and the band-pass filter can be increased. Preferably, 0.5 < f4 / f < 1.5.

[0099] In the embodiment, the curvature radius R1 of the object side surface of the first lens, the central thickness CT1 of the first lens on the optical axis satisfy: 1.8 < R1 / CT1 < 4. By limiting R1 / CT1 in a reasonable range, the first lens can be prevented from being too curved, the deflection angle of light on the first lens can be reduced, the surface optical sensitivity and the tilt sensitivity of the first lens can be reduced, and the molding and surface stability are beneficial. Preferably, 1.9 < R1 / CT1 < 3.8.

[0100] In the embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the curvature radius R4 of the image side surface of the second lens satisfy: 0 < (f1+f2) / R4 < 2. By limiting (f1+f2) / R4 in a reasonable range, the second lens can be prevented from being too curved, the surface optical sensitivity can be reduced, and the molding and surface stability are beneficial. Preferably, 0.5 < (f1+f2) / R4 < 1.8.

[0101] In the embodiment, the edge thickness ET1 of the first lens at the maximum effective diameter, the edge thickness ET2 of the second lens at the maximum effective diameter satisfy: 1 < ET2 / ET1 < 4. By limiting ET2 / ET1 in a reasonable range, the edge thicknesses of the first lens and the second lens are reasonably distributed, the lens is easy to be injection molded, and the processability of the optical imaging lens is improved. Preferably, 1.1 < ET2 / ET1 < 3.8.

[0102] In the embodiment, the central thickness CT1 of the first lens on the optical axis, the edge thickness ET1 of the first lens at the maximum effective diameter satisfy: 2.04 ≤ CT1 / ET1 < 4.2. By limiting CT1 / ET1 in a reasonable range, the processability of the first lens can be ensured, and the yield is improved. Preferably, 2.04 ≤ CT1 / ET1 < 4.00.

[0103] In the embodiment, the number of lenses with Abbe number greater than 50 is equal to the number of lenses with Abbe number less than 50 in the four lenses. The reasonable distribution of low-refractive lens material and high-refractive lens material is beneficial to balance the off-axis chromatic aberration among the lenses and obtain better imaging quality.

[0104] In the embodiment, the effective half aperture of the object side of the first lens DT11 and the effective half aperture of the object side of the Nth lens DTN1 satisfy DT11 / DTN1>1, where N is 2, 3 or 4. By limiting DT11 / DTN1 in a reasonable range, the larger effective half aperture of the first lens is beneficial to realize larger light flux and improve the resolving power of the system. Preferably, 1.05<DT11 / DTN1<1.50.

[0105] In the embodiment, the central thickness CT4 of the fourth lens on the optical axis, the on-axis distance SAG41 between the intersection of the object side of the fourth lens and the optical axis and the effective radius vertex of the object side of the fourth lens satisfy 0<CT4 / SAG41<2. By limiting CT4 / SAG41 in a reasonable range, the fourth lens is prevented from being too curved, the processing difficulty is reduced, and the optical imaging lens has better balanced chromatic aberration and distortion. Preferably, 0.5<CT4 / SAG41<1.8.

[0106] In the embodiment, the maximum refractive index Nmax of all the lenses is less than 1.7, and the maximum Abbe number Vmax of all the lenses is less than 60. The materials used by the lenses are common materials in plastic materials, which are easy to process, can realize the characteristics of thin and light optical imaging lens, and are low in cost, thereby saving production cost.

[0107] In the embodiment, the distance BFL between the image side of the fourth lens and the imaging surface of the optical imaging lens on the optical axis and the sum ∑CT of the central thicknesses of all the lenses on the optical axis satisfy 1<BFL / ∑CT<3.5. By limiting BFL / ∑CT in a reasonable range, a larger value of BFL is beneficial to improve the focal length and further improve the long-focus zoom ratio. Preferably, 1.2<BFL / ∑CT<3.2.

[0108] Optionally, the first lens has positive refractive power; the second lens has negative refractive power; the object side of the third lens is convex; the image side of the third lens is concave; the object side of the fourth lens is convex; and the image side of the fourth lens is concave. Through the design of the surface type or refractive power of each lens, the aberration and chromatic aberration of the optical imaging lens are improved, and the imaging quality is improved.

[0109] Optionally, the optical imaging lens can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0110] The optical imaging lens in the present application can adopt multiple lenses, for example, four lenses as described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and 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, so that the optical imaging lens is more conducive to production and processing and can be applied to portable electronic devices such as smart phones. The optical imaging lens described above also has the advantages of large aperture, large field of view, ultra-thin, and good imaging quality, which can meet the miniaturization requirements of smart electronic products.

[0111] In the present application, at least one of the lens surfaces of each lens is a non-spherical surface. The characteristic of a non-spherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with constant curvature from the center of the lens to the periphery of the lens, a non-spherical lens has better curvature radius characteristics, which has the advantages of improving distortion aberration and improving astigmatism aberration. After using a non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0112] However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although four lenses are described as an example in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens can also include other numbers of lenses.

[0113] The specific surface shape and parameters of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0114] It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

[0115] Example One

[0116] As shown in Figures 1 to 5 , the optical imaging lens of example one of the present application is described. Figure 1 The structural schematic diagram of the optical imaging lens of example one is shown.

[0117] As shown in Figure 1 , the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a stop STO, a prism P1, a parallel plate P2, a filter, and an imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X axis, and the prism P1 to the imaging surface S11 are distributed along the Y axis.

[0118] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has negative refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is concave. The third lens E3 has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is concave. The filter has the object side S9 of the filter and the image side S10 of the filter. Light from an object sequentially passes through each surface S1 to S10 and is finally imaged on the imaging surface S11.

[0119] Table 1 shows the basic structure parameter table of the optical imaging lens of Example One, wherein the units of the radius of curvature, thickness / distance, focal length are all millimeters (mm).

[0120] Surface No. Surface Type Curvature Radius Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity S1 Asphere 2.6566 1.0717 1.55 56.14 -0.0127 S2 Asphere 69.6887 0.3272 0.0000 S3 Asphere -88.8483 0.3300 1.62 25.93 0.0000 S4 Asphere 1.6412 0.2679 -3.3922 S5 Asphere 3.3254 0.4282 1.67 20.37 0.2297 S6 Asphere 12.6172 0.0700 46.2903 S7 Asphere 1.7605 0.3250 1.55 56.14 -0.1504 S8 (STO) Asphere 2.1739 0.6000 -4.9899 Sphere Infinity 1.3900 1.57 56.04 P1 Sphere Infinity 1.3900 1.57 56.04 P2 Sphere Infinity 1.3900 1.57 56.04 Sphere Infinity 3.8871 S9 Sphere Infinity 0.2100 1.52 64.20 S10 Sphere Infinity 1.1717

[0121] Table 1

[0122] In Example One, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0123]

[0124] wherein x is the distance from the vertex of the aspherical surface when the aspherical surface is at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each aspherical surface S1-S8 in Example One.

[0125]

[0126]

[0127] Table 2

[0128] Figure 2 The axial chromatic aberration curve of the optical imaging lens of Example One is shown, which represents the convergence focal point deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 3 The astigmatism curve of the optical imaging lens of Example One is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 4 The distortion curve of the optical imaging lens of Example One is shown, which represents the distortion size value corresponding to different field angles.Figure 5 The focal power chromatic aberration curve of the optical imaging lens of Example One is shown, which represents the deviation of light rays at different image heights on the imaging plane after passing through the optical imaging lens.

[0129] According to Figures 2 to 5 It can be seen that the optical imaging lens given in Example One can achieve good imaging quality.

[0130] Example Two

[0131] As Figures 6 to 10 shown, the optical imaging lens of Example Two of the present application is described. Figure 6 The structural schematic diagram of the optical imaging lens of Example Two is shown. For the sake of brevity, some similar descriptions with Example One will be omitted.

[0132] As Figure 6 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a stop STO, a prism P1, a parallel plate P2, a filter, and an imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X-axis, and the prism P1 to the imaging surface S11 are distributed along the Y-axis.

[0133] The first lens E1 has positive focal 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 focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 and an image side surface S10 of the filter. Light from the object sequentially passes through each surface S1 to S10 and is finally imaged on the imaging surface S11.

[0134] Table 3 shows the basic structural parameter table of the optical imaging lens of Example Two, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm).

[0135]

[0136]

[0137] Table 3

[0138] In Example Two, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the formula (1) in Example One.

[0139] The high order term coefficients of each aspherical surface S1-S8 in Example Two are shown in Table 4.

[0140] Surface No. A4 A6 A8 A10 A12 A14 A16 S1 -5.0991E-02 -1.5812E-02 -2.6259E-03 9.6973E-04 3.8943E-04 2.7015E-04 3.7050E-05 S2 1.8494E-01 -3.6746E-02 8.2371E-03 -3.1492E-05 -5.9001E-06 7.0357E-04 -3.3295E-04 S3 8.9670E-02 1.0635E-03 2.5629E-03 1.7324E-04 -6.1699E-04 9.8020E-04 -6.8112E-04 S4 -4.0259E-01 -1.3269E-02 -7.5345E-03 -1.7304E-03 1.8978E-03 -3.4316E-04 7.0161E-04 S5 -5.7238E-02 -1.2692E-02 -7.8784E-03 -2.9304E-03 3.4324E-03 -1.4317E-03 1.2352E-03 S6 7.3472E-02 -4.9270E-03 -5.1143E-03 -3.4833E-04 1.6450E-03 -8.1069E-04 3.5294E-04 S7 -2.5124E-01 -3.2994E-02 -4.8446E-03 8.5199E-04 6.8904E-05 1.9783E-04 -1.5600E-04 S8 -8.5832E-02 -2.8281E-02 -6.2638E-04 3.8750E-04 -1.1957E-04 2.5369E-04 -1.8180E-04 Surface No. A18 A20 A22 A24 A26 A28 A30 S1 4.8365E-05 1.6194E-06 -2.4850E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 3.1808E-04 -1.8224E-04 9.8028E-05 -3.4761E-05 8.7797E-06 0.0000E+00 0.0000E+00 S3 5.2497E-04 -3.7285E-04 2.3025E-04 -1.1764E-04 4.6115E-05 -1.2741E-05 2.8718E-06 S4 -2.7751E-04 2.0166E-04 -9.8035E-05 3.4687E-05 -7.8516E-05 5.2557E-05 -1.0798E-05 S5 -5.9672E-04 5.0725E-04 -1.4280E-04 4.4280E-05 -8.4790E-05 2.5028E-05 0.0000E+00 S6 -2.9302E-04 2.9488E-04 -5.9368E-05 6.0961E-06 -1.0401E-05 -6.0372E-07 0.0000E+00 S7 -7.8057E-05 6.0956E-05 1.5470E-05 -7.7627E-06 1.0976E-06 -4.2257E-07 1.0042E-07 S8 4.1003E-05 -1.7299E-05 2.2051E-05 -8.7817E-06 0.0000E+00 0.0000E+00 0.0000E+00

[0141] Table 4

[0142] Figure 7 The axial chromatic aberration curve of the optical imaging lens of Example Two is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 8 The astigmatism curve of the optical imaging lens of Example Two is shown, which represents the meridional image curvature and sagittal image curvature. Figure 9 The distortion curve of the optical imaging lens of Example Two is shown, which represents the distortion size values corresponding to different field angles. Figure 10 The lateral chromatic aberration curve of the optical imaging lens of Example Two is shown, which represents the deviation of light rays on the imaging surface after passing through the optical imaging lens.

[0143] According to Figures 7 to 10 It can be seen that the optical imaging lens of Example Two can achieve good imaging quality.

[0144] Example Three

[0145] As Figures 11 to 15 shown, the optical imaging lens of Example Three of the present application is described. Figure 11 The structural schematic diagram of the optical imaging lens of Example Three is shown. For the sake of brevity, part of the similar description with Example One will be omitted.

[0146] As Figure 11 shown, the optical imaging lens sequentially includes, from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a prism P1, a parallel plate P2, a filter, and an imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X axis, and the prism P1 to the imaging surface S11 are distributed along the Y axis.

[0147] The first lens E1 has positive refractive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens E2 has negative refractive power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The third lens E3 has positive refractive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 and an image side surface S10. The light from the object sequentially passes through each surface S1-S10 and finally forms an image on the imaging surface S11.

[0148] Table 5 shows the basic structure parameter table of the optical imaging lens of Example Three, wherein the units of the radius of curvature, the thickness / distance, and the focal length are millimeters (mm).

[0149] Surface No. Surface Type Curvature Radius Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity S1 (STO) Asphere 3.7417 1.0000 1.55 56.14 0.0066 S2 Asphere -12.2712 0.7686 1.7868 S3 Asphere -15.9836 0.2825 1.58 32.55 -5.5189 S4 Asphere 1.7401 0.5028 -3.1310 S5 Asphere 3.5264 0.4446 1.58 33.73 -0.5865 S6 Asphere 13.0376 0.0748 50.6063 S7 Asphere 2.9109 0.4337 1.54 56.00 0.9027 S8 Asphere 5.8459 0.5985 0.7900 Sphere Infinity 1.5700 1.57 56.04 P1 Sphere Infinity 1.5700 1.57 56.04 P2 Sphere Infinity 1.5700 1.57 56.04 Sphere Infinity 2.4557 S9 Sphere Infinity 0.2000 1.52 64.20 S10 Sphere Infinity 2.2447

[0150] Table 5

[0151] In Example Three, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the formula (1) in Example One.

[0152] Table 6 gives the high-order term coefficients of the aspherical surfaces S1-S8 that can be used in Example Three.

[0153]

[0154]

[0155] Table 6

[0156] Figure 12 The axial chromatic aberration curve of the optical imaging lens of Example Three is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 13 The astigmatism curve of the optical imaging lens of Example Three is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 14 The distortion curve of the optical imaging lens of Example Three is shown, which represents the distortion size values corresponding to different field angles. Figure 15 The magnification chromatic aberration curve of the optical imaging lens of Example Three is shown, which represents the deviation of light rays on the imaging surface after passing through the optical imaging lens.

[0157] According to Figures 12 to 15 It can be known that the optical imaging lens given in Example Three can achieve good imaging quality.

[0158] Example Four

[0159] As Figures 16 to 20 shown, the optical imaging lens of Example Four of the present application is described. Figure 16 The structural schematic diagram of the optical imaging lens of Example Four is shown. For the sake of brevity, part of the similar description with Example One will be omitted.

[0160] As Figure 16 shown, the optical imaging lens sequentially comprises, from the object side to the image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the prism P1, the parallel plate P2, the filter, and the imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X-axis, and the prism P1 to the imaging surface S11 are distributed along the Y-axis.

[0161] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is convex. The second lens E2 has negative refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is concave. The third lens E3 has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is concave. The filter has the object side S9 of the filter and the image side S10 of the filter. The light from the object sequentially passes through the surfaces S1-S10 and is finally imaged on the imaging surface S11.

[0162] Table 7 shows the basic structure parameter table of the optical imaging lens of Example Four, wherein the units of the radius of curvature, the thickness / distance, and the focal length are millimeters (mm).

[0163]

[0164]

[0165] Table 7

[0166] In Example Four, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but not limited to, the formula (1) in Example One.

[0167] Table 8 gives the high-order term coefficients of the aspherical surfaces S1-S8 that can be used in Example Four.

[0168] Surface No. A4 A6 A8 A10 A12 A14 A16 S1 -5.7020E-03 -7.0444E-03 -4.0351E-03 -1.0739E-03 -3.0487E-04 5.4941E-05 3.2892E-05 S2 2.3534E-01 -3.2160E-02 2.2224E-03 1.2820E-03 -1.0830E-03 1.4176E-03 -5.8972E-04 S3 1.2154E-01 6.2576E-03 -5.0847E-03 5.1739E-03 -2.6222E-03 2.1385E-03 -9.5882E-04 S4 -5.9986E-02 2.1594E-03 -8.8551E-03 1.4726E-04 1.2724E-04 6.2256E-05 4.3806E-04 S5 -3.4731E-02 6.2130E-03 -3.0687E-03 -4.2158E-03 2.9679E-03 -1.1155E-03 1.0419E-03 S6 5.4801E-02 3.1576E-03 6.4879E-04 -3.6955E-03 2.7784E-03 -1.2089E-03 8.9958E-04 S7 -2.3043E-01 -2.1819E-02 -2.3626E-03 -1.3457E-03 9.7874E-04 -4.7027E-04 3.7983E-04 S8 -6.7763E-02 -1.4466E-02 -1.9759E-04 -6.9621E-05 3.9168E-05 7.5553E-05 -4.4752E-05 Surface No. A18 A20 A22 A24 A26 A28 A30 S1 4.5916E-05 2.0876E-05 1.1251E-05 -6.3014E-07 -5.1371E-06 -1.4317E-06 -5.4190E-07 S2 5.4284E-04 -2.4441E-04 6.0439E-05 -1.0537E-04 7.5856E-05 -1.9377E-05 -6.8610E-07 S3 7.1606E-04 -3.5183E-04 8.3548E-05 -1.0725E-04 8.8976E-05 -3.7190E-05 7.3362E-06 S4 -9.4909E-05 3.2623E-04 -1.9966E-04 -6.7761E-05 -1.0939E-05 3.9727E-05 -6.9066E-06 S5 -4.7996E-04 6.7913E-04 -2.8572E-04 -7.3961E-05 -5.4644E-05 4.7253E-05 -1.3949E-06 S6 -6.7279E-04 6.2484E-04 -2.4637E-04 5.5075E-05 -7.1392E-05 2.7624E-05 -2.9948E-06 S7 -3.6275E-04 2.6738E-04 -1.1474E-04 4.9518E-05 -2.3464E-05 4.6256E-06 4.4806E-07 S8 3.3644E-07 4.1893E-06 8.7813E-06 -7.9755E-06 4.8001E-06 -4.0954E-06 1.4694E-06

[0169] Table 8

[0170] Figure 17 The axial chromatic aberration curve of the optical imaging lens of Example Four is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 18 The astigmatism curve of the optical imaging lens of Example Four is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 19 The distortion curve of the optical imaging lens of Example Four is shown, which represents the distortion size values corresponding to different field angles. Figure 20 The magnification chromatic aberration curve of the optical imaging lens of Example Four is shown, which represents the deviation of light rays on the imaging surface after passing through the optical imaging lens.

[0171] According to Figures 17 to 20 It can be seen that the optical imaging lens given in Example Four can achieve good imaging quality.

[0172] Example Five

[0173] As shown in Figures 21 to 25 the optical imaging lens of example five is described. Figure 21 The structural schematic diagram of the optical imaging lens of example five is shown. For brevity, the description similar to example one will be omitted.

[0174] As shown in Figure 21 the optical imaging lens comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a stop STO, a prism P1, a parallel plate P2, a filter, and an imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X axis, and the prism P1 to the imaging surface S11 are distributed along the Y axis.

[0175] The first lens E1 has positive refractive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens E2 has negative refractive power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The third lens E3 has positive refractive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 of the filter and an image side surface S10 of the filter. The light from the object sequentially passes through each surface S1 to S10 and is finally imaged on the imaging surface S11.

[0176] Table 9 shows the basic structural parameter table of the optical imaging lens of example five, wherein the units of the curvature radius, the thickness / distance, and the focal length are all millimeters (mm).

[0177] Surface No. Surface Type Curvature Radius Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity S1 Asphere 3.4632 1.4358 1.55 56.14 -0.1951 S2 Asphere -5.6224 0.4366 -1.9914 S3 Asphere -5.9607 0.4300 1.58 31.06 -6.3388 S4 Asphere 1.7089 0.3350 -3.2363 S5 Asphere 3.5320 0.4981 1.64 24.50 -0.5660 S6 Asphere 12.2345 0.0748 52.5299 S7 Asphere 2.7519 0.4912 1.54 55.71 0.8249 S8 (STO) Asphere 4.4596 0.5985 0.9465 Sphere Infinity 1.3000 1.57 56.04 P1 Sphere Infinity 1.3000 1.57 56.04 P2 Sphere Infinity 1.3000 1.57 56.04 Sphere Infinity 3.6750 S9 Sphere Infinity 0.2100 1.52 64.20 S10 Figure 22 Figure 23 1.5150

[0178] Table 9

[0179] In example five, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but not limited to, the formula (1) in example one.

[0180] Table 10 gives the high-order term coefficients of the aspherical surfaces S1-S8 that can be used in example five.

[0181]

[0182]

[0183] Table 10

[0184] Figure 24On-axis chromatic aberration curves of the optical imaging lens of Example Five are shown, which represent the convergence point deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 25 Astigmatism curves of the optical imaging lens of Example Five are shown, which represent the meridional image curvature and sagittal image curvature. Figures 22 to 25 Distortion curves of the optical imaging lens of Example Five are shown, which represent the distortion size values corresponding to different field angles. Figures 26 to 30 Lateral chromatic aberration curves of the optical imaging lens of Example Five are shown, which represent the deviation of light rays on the imaging plane at different image heights after passing through the optical imaging lens.

[0185] According to Figure 26 It can be known that the optical imaging lens given in Example Five can achieve good imaging quality.

[0186] Example Six

[0187] As Figure 26 shown, the optical imaging lens of Example Six of the present application is described. Surface No. A structural schematic diagram of the optical imaging lens of Example Six is shown. For the sake of brevity, part of the similar description with Example One will be omitted.

[0188] As Surface Type shown, the optical imaging lens sequentially comprises, from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a prism P1, a parallel plate P2, a filter, and an imaging surface S11. Among them, the first lens E1 to the prism P1 are distributed along the X axis, and the prism P1 to the imaging surface S11 are distributed along the Y axis.

[0189] The first lens E1 has positive refractive power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a convex surface. The second lens E2 has negative refractive power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The filter has an object side surface S9 and an image side surface S10 of the filter. Light from the object sequentially passes through each surface S1 to S10 and is finally imaged on the imaging surface S11.

[0190] Table 11 shows the basic structural parameter table of the optical imaging lens of Example Six, wherein the units of the curvature radius, the thickness / distance, and the focal length are all millimeters (mm).

[0191] Curvature Radius Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity S1 (STO) Asphere Asphere Asphere 2.7462 1.1141 1.55 56.14 0.0193 S2 Asphere -180.8562 0.3933 99.0000 S3 Asphere 50.0000 0.3087 1.62 24.45 -99.0000 S4 Asphere 1.7657 0.2126 -3.4465 S5 Asphere 4.6289 0.6187 1.65 23.18 0.8133 S6 Asphere 8.8828 0.1210 36.1561 S7 Sphere 1.7805 0.5072 1.63 25.62 0.1435 S8 Infinity 2.3726 0.6281 -1.3563 Sphere Infinity 1.6000 1.57 56.04 P1 Sphere Infinity 1.6000 1.57 56.04 P2 Sphere Infinity 1.6000 1.57 56.04 Sphere Infinity 0.8043 S9 Sphere Infinity 0.2100 1.52 64.20 S10 Surface No. Surface No. 2.6204

[0192] Table 11

[0193] In Example Six, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by, but not limited to, the formula (1) in Example One.

[0194] Table 12 gives the high-order term coefficients of the aspherical surfaces S1-S8 used in Example Six.

[0195] Figure 27 A4 A6 A8 A10 A12 A14 A16 S1 2.6716E-02 -3.0561E-03 -1.3863E-03 -7.9351E-04 -1.3518E-04 -7.1486E-05 -1.3196E-05 S2 1.5549E-01 -2.2413E-02 2.7563E-03 -2.2708E-03 6.6851E-04 -3.0124E-04 9.2253E-05 S3 1.2781E-02 8.4685E-03 3.6033E-03 -2.8497E-03 1.3906E-03 -6.1365E-04 1.9720E-04 S4 -4.6191E-02 1.3433E-02 -1.3569E-03 1.3724E-03 -2.6814E-04 8.7289E-05 -7.9792E-05 S5 1.0063E-02 3.3932E-03 -1.1070E-02 4.9974E-03 -1.8446E-03 6.4437E-04 -2.2645E-04 S6 2.9872E-02 2.4720E-02 -1.9446E-02 7.2811E-03 -3.2406E-03 1.2842E-03 -4.9744E-04 S7 -2.6106E-01 2.5428E-02 -1.5087E-02 5.9883E-03 -2.9936E-03 1.3016E-03 -5.4062E-04 S8 -6.9014E-02 1.1188E-02 -1.5109E-03 6.0268E-04 -2.2474E-04 8.8448E-05 -2.6578E-05 Figure 28 A18 A20 A22 A24 A26 A28 A30 S1 -1.2422E-06 -2.9010E-06 5.4958E-07 3.0636E-08 4.4208E-07 0.0000E+00 0.0000E+00 S2 -1.0225E-05 -7.4385E-06 7.8696E-06 -2.3144E-06 2.1865E-07 0.0000E+00 0.0000E+00 S3 -2.0350E-05 -3.5822E-05 3.7525E-05 -2.0166E-05 5.9410E-06 -7.1843E-07 0.0000E+00 S4 1.0226E-04 -9.5898E-05 4.5766E-05 -7.1194E-06 -2.7333E-06 8.7580E-07 0.0000E+00 S5 1.0197E-04 -6.7533E-05 2.2249E-05 3.8538E-06 -5.7234E-06 1.7250E-06 0.0000E+00 S6 1.7381E-04 -7.5021E-05 2.8368E-05 -6.2424E-06 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.9815E-04 -7.5990E-05 2.8757E-05 -7.7970E-06 1.0017E-06 0.0000E+00 0.0000E+00 S8 1.3623E-06 4.0980E-07 -3.5107E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0196] Table 12

[0197] Figure 29 The axial chromatic aberration curve of the optical imaging lens arrangement of Example Six is shown, which represents the deviation of convergent focal points of light rays of different wavelengths after passing through the optical imaging lens arrangement. Figure 30 The astigmatism curve of the optical imaging lens arrangement of Example Six is shown, which represents the meridional image curvature and sagittal image curvature. Figures 27 to 30 The distortion curve of the optical imaging lens arrangement of Example Six is shown, which represents the distortion size values corresponding to different field angles of view. Conditional Expression / Example The lateral chromatic aberration curve of the optical imaging lens arrangement of Example Six is shown, which represents the deviation of different image heights on the imaging plane after passing through the optical imaging lens arrangement.

[0198] According to TTL / f It can be seen that the optical imaging lens arrangement given in Example Six can achieve good imaging quality.

[0199] In summary, Examples One to Six respectively satisfy the relationships shown in Table 13.

[0200] (R5+R6) / f3 1 2 3 4 5 6 V4 / V3 1.07 1.08 1.14 1.08 1.11 1.10 CT4 / T34 2.40 5.19 2.05 1.60 2.09 0.97 (R5+R6) / (R7+R8) 2.76 2.76 1.66 2.17 2.27 1.11 T12 / T23 4.64 5.74 5.80 5.74 6.57 4.19 BFL / CT4 4.05 6.78 1.89 3.58 2.19 3.25 BFL / ∑CT 1.22 2.72 1.53 0.43 1.30 1.85 f3 / f 16.21 17.09 14.92 12.36 10.99 7.17 f4 / f 2.45 2.32 2.99 2.17 1.89 1.43 CT4 / SAG41 0.55 0.42 0.67 0.83 0.62 1.25 CT1 / ET1 1.11 1.29 0.84 0.84 0.99 0.75 ∑AT / T23 0.84 0.74 1.06 1.09 1.66 1.22 R1 / CT1 2.95 3.50 3.81 3.50 2.13 2.04 (f1+f2) / R4 2.48 4.26 2.68 1.73 2.53 3.42 ET2 / ET1 2.48 2.94 3.74 2.16 2.41 2.47 DT11 / DT21 1.48 0.75 1.55 0.58 1.13 1.15 DT11 / DT31 2.24 3.06 3.53 2.80 1.55 1.17 DT11 / DT41 1.11 1.09 1.14 1.06 1.19 1.17 Basic Data / Example 1.33 1.26 1.31 1.28 1.35 1.31 TTL (mm) 1.41 1.40 1.35 1.39 1.46 1.31

[0201] Table 13

[0202] Table 14 gives some parameters of the optical imaging lens arrangements of Examples One to Six, Fno represents the F number of the optical imaging lens arrangement, ImgH represents the image height, and Semi-FOV represents half of the maximum field angle of view of the optical imaging lens arrangement.

[0203] ImgH (mm) 1 2 3 4 5 6 Semi-FOV (°) 12.86 12.87 13.72 12.87 13.60 12.34 Fno 2.60 2.60 2.53 2.60 2.60 2.60 f (mm) 12.1 12.1 11.9 12.2 11.8 12.9 f1 (mm) 3.1 3.1 2.6 3.1 3.1 3.1 f2 (mm) 11.99 11.95 12.00 11.94 12.26 11.22 f3 (mm) 5.03 3.31 5.37 2.98 4.16 4.96 f4 (mm) -2.59 -1.78 -2.67 -1.85 -2.23 -2.94 BFL (mm) 6.63 4.96 8.08 9.96 7.56 13.98 SAG41 (mm) 13.26 15.38 10.09 9.97 12.12 8.44 ET1 (mm) 5.27 5.39 6.47 5.31 5.40 3.63 ET2 (mm) 0.38 0.43 0.41 0.39 0.30 0.41 ​ 0.36 0.34 0.26 0.38 0.67 0.55 ​ 0.82 1.03 0.93 1.06 1.05 0.64

[0204] Table 14

[0205] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens arrangement described above.

[0206] Obviously, the above-described embodiments are only some, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the protection scope of the present application.

[0207] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0208] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0209] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to those embodiments; instead, they will include, in addition to the above-described embodiments, all embodiments that are equivalent in whole or in part to the embodiments described and illustrated above, and which fall within the scope of the present application. Accordingly, the scope of the present application is defined only by the following claims.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens is composed of two imaging lens groups, an optical axis of the optical imaging lens comprises X-axis and Y-axis perpendicular to each other, and sequentially comprises, from an object side to an image side of the optical imaging lens: The first imaging lens group is distributed along the X-axis, the first imaging lens group has four lenses with optical power, sequentially comprises, from the object side to the image side of the optical imaging lens, first lens to fourth lens, the third lens and the fourth lens both have positive optical power, the first lens has positive optical power, the object side surface of the first lens is convex, the second lens has negative optical power, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; The second imaging lens group is sequentially composed of a prism distributed along the X-axis and a parallel flat plate distributed along the Y-axis, from the object side to the image side of the optical imaging lens, the prism and the parallel flat plate are cemented together; Wherein, an on-axis distance TTL from the object side surface of the first lens to an imaging surface of the optical imaging lens, and an effective focal length f of the optical imaging lens satisfy: 1.07≤TTL / f≤1.14; A center thickness CT4 of the fourth lens on the optical axis, and an on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens satisfy: 0.74≤CT4 / SAG41≤1.

66. 2.The optical imaging lens according to claim 1, wherein, A curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, and an effective focal length f3 of the third lens satisfy: 0.97≤(R5+R6) / f3≤5.

19. 3.The optical imaging lens according to claim 1, wherein, An Abbe number V4 of the fourth lens and an Abbe number V3 of the third lens satisfy: 2.76≥V4 / V3≥1.

11. 4.The optical imaging lens according to claim 1, wherein, A center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens, and an air gap T34 of the third lens and the fourth lens on the optical axis satisfy: 4.19≤CT4 / T34≤6.

57.

5. The optical imaging lens according to claim 1, characterized in that, The air gap of the third lens and the fourth lens on the optical axis is the smallest among air gaps of all adjacent two lenses on the optical axis, and a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, a curvature radius R7 of the object side surface of the fourth lens, and a curvature radius R8 of the image side surface of the fourth lens satisfy: 1.89≤(R5+R6) / (R7+R8)≤6.

78. 6.The optical imaging lens according to claim 1, wherein, An air gap T12 of the first lens and the second lens on the optical axis, and an air gap T23 of the second lens and the third lens on the optical axis satisfy: 0.43≤T12 / T23≤2.

72. 7.The optical imaging lens according to claim 1, wherein, A distance BFL on the optical axis from an image side surface of the fourth lens to an imaging surface of the optical imaging lens, a central thickness CT4 on the optical axis of the fourth lens satisfy: 7.17≤BFL / CT4≤17.

09. 8.The optical imaging lens according to claim 1, wherein, An effective focal length f3 of the third lens, an effective focal length f of the optical imaging lens satisfy: 0.42≤f3 / f≤1.

25. 9.The optical imaging lens according to claim 1, wherein, A sum ∑AT of air spacings on the optical axis of any two adjacent lenses, an air spacing T23 on the optical axis of the second lens and the third lens satisfy: 1.73≤∑AT / T23≤4.

26. 10.The optical imaging lens according to claim 1, wherein, An effective focal length f4 of the fourth lens, an effective focal length f of the optical imaging lens satisfy: 0.75≤f4 / f≤1.

29. 11.The optical imaging lens according to claim 1, wherein, A curvature radius R1 of an object side surface of the first lens, a central thickness CT1 on the optical axis of the first lens satisfy: 2.16≤R1 / CT1≤3.

74. 12.The optical imaging lens according to claim 1, wherein, An effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a curvature radius R4 of an image side surface of the second lens satisfy: 0.58≤(f1+f2) / R4≤1.

55.

13. The optical imaging lens according to any of claims 1-12, wherein, An edge thickness ET1 at a maximum effective diameter of the first lens, an edge thickness ET2 at a maximum effective diameter of the second lens satisfy: 1.17≤ET2 / ET1≤3.

53. 14.The optical imaging lens according to any one of claims 1 to 12, wherein, A central thickness CT1 on the optical axis of the first lens, an edge thickness ET1 at a maximum effective diameter of the first lens satisfy: 2.04≤CT1 / ET1≤3.

81. ​ 15. The optical imaging lens according to any one of claims 1-12, wherein, Among the first lens to the fourth lens, the number of lenses with Abbe number greater than 50 is equal to the number of lenses with Abbe number less than 50.

16. The optical imaging lens according to any one of claims 1-12, wherein, An effective half diameter DT11 of an object side surface of the first lens, an effective half diameter DTN1 of an object side surface of the Nth lens satisfy: 1.46≥DT11 / DTN1≥1.06, where N is 2, 3, 4.

17. The optical imaging lens according to any one of claims 1-12, wherein, A maximum value Nmax of refractive index of all the lenses satisfy: 1.58≤Nmax<1.7, a maximum value Vmax of Abbe number of all the lenses satisfy: 56.14≤Vmax<60.

18. The optical imaging lens according to any one of claims 1-12, wherein, A distance BFL on the optical axis from an image side surface of the fourth lens to an imaging surface of the optical imaging lens, a sum ∑CT of central thicknesses on the optical axis of all the lenses satisfy: 1.43≤BFL / ∑CT≤2.99.

Images