Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens barrel, the lens group is composed of six lenses, and the six lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side; the spacing element group comprises a first spacing element, a second spacing element and a third spacing element; the formula is as follows: 0.30 lt; (T12 + T23) / CT2 < = 0.80; the formula is as follows: 3.90 degrees / mmlt; the method comprises the following steps: carrying out FOV / Llt; 4.95 degrees / mm; 0.75 lt is satisfied; (EP01 + EP23) / EP12lt; and 1.17. The optical imaging lens solves the problem that a six-piece optical imaging lens in the prior art meets the wide-angle requirement, so that the sensitivity of the lens is increased, and the imaging performance is affected.

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 rapid development of electronic technology, portable electronic devices such as smart phones, tablet computers, driving recorders and sports cameras have become popular rapidly. These devices have put forward higher requirements on the relevant technologies of the optical imaging lenses installed on them, especially in wide-angle imaging.

[0003] In order to obtain a wide shooting field of view and meet a deeper depth of field, as well as to present clear details of the entire scene, the demand for wide-angle optical imaging lenses is increasing. Taking a six-piece optical imaging lens as an example, the current six-piece optical imaging lens usually increases the thickness and size of the lens in order to meet the wide-angle characteristics. The increase in the overall size of the lens is likely to lead to an increase in the sensitivity of the lens, which is likely to affect the performance peak and field curvature of the optical imaging lens, affecting the imaging performance, and ultimately leading to poor imaging quality.

[0004] That is to say, the six-element optical imaging lens in the prior art has the problem that meeting the wide-angle requirement leads to increased lens sensitivity, thus affecting the imaging performance. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the six-lens optical imaging lens in the prior art has an increased sensitivity of the lens in order to meet the wide-angle requirement, thereby affecting the imaging performance.

[0006] In order to achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; the air gap T12 between the first lens and the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the central thickness CT2 of the second lens satisfy: 0.30 < (T12 + T23) / CT2 ≤ 0.80; the half of the maximum field of view Semi-FOV of the optical imaging lens and the maximum axial height L of the lens barrel satisfy: 3.90° / mm < Semi-FOV / L < 4.95° / mm; the interval distance EP01 along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, the interval distance EP23 along the optical axis from the second spacer element to the third spacer element, and the interval distance EP12 along the optical axis from the first spacer element to the second spacer element satisfy: 0.75 < (EP01 + EP23) / EP12 < 1.17.

[0007] According to another aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The object side surface of the first lens is convex, and the image side surface is concave. The object side surface of the second lens is concave, and the image side surface is convex. The object side surface of the third lens is convex, and the image side surface is convex. The object side surface of the fourth lens is convex, and the image side surface is concave. The object side surface of the fifth lens is convex, and the image side surface is convex. The image side surface of the sixth lens is concave. The spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following relationships are satisfied among the effective focal length f2 of the second lens, the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, and the central thickness CT2 of the second lens: 7.05 mm < f2 / (EP12 / CT2) < 16.40 mm. The following relationship is satisfied among the effective focal length f4 of the fourth lens, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element: -0.95 < f4 / (D4s - d4s) < -0.70. The following relationship is satisfied among the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, and the outer diameter D3s of the object side of the third spacer element: 0.15 mm -1 < f3 / CT3 / D3s < 0.35 mm -1 .

[0008] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel and six lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses, the first spacer element, the second spacer element, and the third spacer element and setting the optical imaging lens to satisfy 0.30 < (T12 + T23) / CT2 ≤ 0.80 and 3.90° / mm < Semi-FOV / L < 4.95° / mm, the characteristics of wide angle can be satisfied. However, the central thickness of the second lens is relatively large. As the front-end lens, the increase in its size leads to an increase in its sensitivity, which has a greater impact on the performance of the optical imaging lens. Therefore, by restricting 0.75 < (EP01 + EP23) / EP12 < 1.17, it is beneficial to restrict the edge thicknesses of the first lens, the second lens, and the third lens, and further control the edge thickness of the second lens and the thickness ratio between the central effective diameter region and the edge structure region of the second lens, reduce the optical sensitivity of the second lens, such as the influence of eccentricity, tilt, surface shape, etc., improve the peak value of the MTF defocus curve, make the field curvature more concentrated, increase the imaging performance, and ensure the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0010] Figure 1 The dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention is shown;

[0011] Figure 2 The dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention is shown;

[0012] Figure 3 The structural schematic diagram of the optical imaging lens of Embodiment 1-1 of the present invention is shown;

[0013] Figure 4 The structural schematic diagram of the optical imaging lens of Embodiment 1-2 of the present invention is shown;

[0014] Figure 5 The structural schematic diagram of the optical imaging lens of Embodiment 1-3 of the present invention is shown;

[0015] Figure 6 and Figure 7 respectively show the axial chromatic aberration curve and the astigmatism curve of the optical imaging lens of Embodiment 1 of the present invention;

[0016] Figure 8 The structural schematic diagram of the optical imaging lens of Embodiment 2-1 of the present invention is shown;

[0017] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0018] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0019] Fig.11 and Fig.12 The axial chromatic aberration curve and the astigmatism curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0020] Fig.13 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0021] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0022] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-3 of the present invention is shown;

[0023] Fig.16 and Fig.17 The axial chromatic aberration curve and the astigmatism curve of the optical imaging lens of the third embodiment of the present invention are respectively shown;

[0024] Fig.18 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0025] Fig.19 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0026] Fig. 20 A schematic structural diagram of an optical imaging lens according to Embodiment 4-3 of the present invention is shown;

[0027] Fig.21 and Fig. 22 The axial chromatic aberration curve and the astigmatism curve of the optical imaging lens of the fourth embodiment of the present invention are respectively shown;

[0028] Fig.23 and Fig.24 The wavefront tolerance sensitivity analysis curve and the MTF defocus curve are respectively shown when an optical imaging lens satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=0.5;

[0029] Fig.25 and Fig.26A wavefront tolerance sensitivity analysis curve and an MTF defocus curve are respectively shown when the optical imaging lens of an optional embodiment of the present invention satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=0.96;

[0030] Fig. 27 and Fig.28 The wavefront tolerance sensitivity analysis curve and MTF defocus curve are respectively shown when another optical imaging lens satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=1.5.

[0031] The above drawings include the following reference numerals:

[0032] P0, lens barrel; 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, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; P1, first spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element; P5, fifth spacing element. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0037] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0038] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In the present application, the left side is the object side and the right side is the image side.

[0039] In order to solve the problem that the six-element optical imaging lens in the prior art has an increased sensitivity of the lens in order to meet the wide-angle requirement, thereby affecting the imaging performance, the present invention provides an optical imaging lens.

[0040] like Figures 1 to 28As shown, in an alternative embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially contacting the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and at least partially contacting the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially contacting the image side surface of the third lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the central thickness CT2 of the second lens satisfy: 0.30 < (T12 + T23) / CT2 ≤ 0.80. The half of the maximum field of view Semi-FOV of the optical imaging lens and the maximum axial height L of the lens barrel satisfy: 3.90° / mm < Semi-FOV / L < 4.95° / mm. The interval distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the interval distance EP23 from the second spacer element to the third spacer element along the optical axis, and the interval distance EP12 from the first spacer element to the second spacer element along the optical axis satisfy: 0.75 < (EP01 + EP23) / EP12 < 1.17.

[0041] The optical imaging lens of the present application consists of a lens barrel and six lenses and multiple spacer elements disposed in the lens barrel. By reasonably arranging the positions of the six lenses, the first spacer element, the second spacer element, and the third spacer element and setting the optical imaging lens to satisfy 0.30 < (T12 + T23) / CT2 ≤ 0.80 and 3.90° / mm < Semi-FOV / L < 4.95° / mm, the characteristics of a wide angle can be satisfied. However, the central thickness of the second lens is relatively large. As the front-end lens, the increase in its size leads to an increase in its sensitivity, which has a greater impact on the performance of the optical imaging lens. Therefore, by restricting 0.75 < (EP01 + EP23) / EP12 < 1.17 in the present application, it is beneficial to restrict the edge thicknesses of the first lens, the second lens, and the third lens, and further control the edge thickness of the second lens and the thickness ratio between the central effective diameter region and the edge structure region of the second lens, reduce the optical sensitivity of the second lens, such as the influence on eccentricity, tilt, surface shape, etc., improve the peak value of the MTF defocus curve, make the field curvature more concentrated, increase the imaging performance, and ensure the imaging quality.

[0042] In addition, in the present application, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens and a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens.

[0043] In addition, refer to Table 1 and Figure 23 to Figure 28 As shown, Fig.23 and Fig.24 The wavefront tolerance sensitivity analysis curve and MTF defocus curve are respectively shown when the optical imaging lens satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=0.5. Fig.25 and Fig.26 The wavefront tolerance sensitivity analysis curve and MTF defocus curve are respectively shown when the optical imaging lens satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=0.96. Fig. 27 and Fig.28 The wavefront tolerance sensitivity analysis curve and MTF defocus curve are respectively shown when the optical imaging lens satisfies (T12+T23) / CT2=0.41, Semi-FOV / L=4.90° / mm and (EP01+EP23) / EP12=1.5.

[0044] Depend on Fig.23 and Fig.24 It can be seen that when (EP01+EP23) / EP12=0.5 is satisfied, the light of the third lens becomes steeper, the overall field curvature is larger, the peak value of most fields of view in the MTF defocus curve is lower, the eccentricity and tilt are more sensitive, and the performance is poor. Fig.25 and Fig.26 It can be seen that when (EP01+EP23) / EP12=0.96 is satisfied, the edge thickness of the second lens and the third lens is moderate, the MTF defocus curve is more concentrated, most of the field of view peaks are higher, the optical sensitivity is low, and the performance is better. Fig. 27 and Fig.28 It can be seen that when (EP01+EP23) / EP12=1.5 is satisfied, the edge surface sensitivity of the second lens increases, the MTF peak decreases, most of the field curvatures are more positive, and the performance is poor. It can be seen that when (EP01+EP23) / EP12 is in the range of 0.75 to 1.15, the tolerance sensitivity curve and the MTF defocus curve of the optical imaging lens perform best. Therefore, the present application constrains the edge thickness of the first lens, the second lens, and the third lens by constraining 0.75<(EP01+EP23) / EP12<1.17, and controls the edge thickness of the second lens within a reasonable range, thereby reducing the optical sensitivity of the second lens, such as eccentricity, tilt, surface shape, etc., and improving the peak value of the MTF defocus curve, making the field curvature more concentrated, increasing the imaging performance, and ensuring the imaging quality.

[0045] Table 1

[0046]

[0047] In this embodiment, the following relationships are satisfied among the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, the central thickness CT5 of the fifth lens, and the maximum axial height L of the lens barrel: 0.44 < (CT2 + CT3 + CT5) / L < 0.60; and the following relationship is satisfied between the object-side outer diameter D5s of the fifth spacer element and the object-side outer diameter D1s of the first spacer element: 1.05 < D5s / D1s < 1.40. By controlling the central thicknesses of the second lens, the third lens, and the fifth lens on the optical axis, the space occupancy of each lens within the optical imaging lens is controlled. Meanwhile, by controlling the relationship between the object-side outer diameter of the fifth spacer element and the object-side outer diameter of the first spacer element within a certain range, the step difference from the object side to the image side of the optical imaging lens can be coordinated with the lenses to control the overall size of the optical imaging lens.

[0048] In this embodiment, the following relationship is satisfied between the distance EP01 along the optical axis from the object-side surface of the lens barrel to the object-side surface of the first spacer element and the distance SAG01 along the optical axis from the intersection of the object-side surface of the first lens and the optical axis to the object-side surface of the lens barrel: 1.35 < EP01 / SAG01 < 9.55. By controlling this condition, the strength of the surface of the object side of the first lens that abuts against the lens barrel is ensured, thereby ensuring the assembly stability of the optical imaging lens. At the same time, the edge thickness of the first lens is ensured, making the first lens more conducive to molding. Within this control range, the problem of the object-side surface of the first lens protruding from the lens barrel and scratching the lens is also avoided.

[0049] In this embodiment, the sum of the air gaps ∑AT between any two adjacent lenses among the first lens to the sixth lens on the optical axis satisfies 0.10 < ∑AT / L < 0.35 with respect to the maximum axial height L of the lens barrel; the sum of the air gaps ∑AT between adjacent lenses among the first lens to the sixth lens on the optical axis satisfies 1.35 < ∑AT / ∑CP < 21.65 with respect to the sum ∑CP of the maximum thicknesses of all spacer elements. By controlling the sum of the air gaps between all adjacent two lenses on the optical axis within a certain range, the maximum axial height of the lens barrel can be controlled to reach a reasonable size, minimizing the length of the entire optical imaging lens as much as possible. Controlling the sum of the maximum thicknesses of all spacer elements is, on the one hand, to reduce the overall length of the optical imaging lens, and on the other hand, to avoid too large tolerances for relatively thick spacer elements, which may cause the lenses to protrude from the bottom surface of the lens barrel when all lenses and all spacer elements are at their extreme tolerances during assembly, thereby avoiding the risk of scratching the lenses during assembly and transportation. It should be noted here that all the above-mentioned spacer elements specifically refer to all spacer elements in the entire optical imaging lens, specifically including the first spacer element to the fifth spacer element and all auxiliary spacer elements. Preferably, 1.35 < ∑AT / ∑CP < 2.75.

[0050] It should be noted that the maximum axial height L of the lens barrel is specifically the distance on the optical axis of the optical imaging lens from the object side of the lens barrel to the image side of the lens barrel.

[0051] In this embodiment, the radius of curvature R4 of the image side of the second lens, the refractive index N2 of the second lens, and the interval distance EP12 between the first spacer element and the second spacer element in the optical axis direction satisfy: -3.70 ≤ R4×N2 / EP12 < -2.25. By controlling this conditional expression, the distortion can be reduced, the total deflection angle of the marginal field light rays on the surfaces of the second lens and the third lens can be reasonably controlled within a reasonable range, and at the same time, the sensitivity of the entire optical system can be effectively reduced.

[0052] In this embodiment, the object-side outer diameter D4s of the fourth spacer element, the effective focal length f4 of the fourth lens, and the radius of curvature R8 of the image side of the fourth lens satisfy: -5.45 mm < D4s / (f4 / R8) < -4.85 mm. By controlling this condition, the influence of the fourth lens on the light path can be effectively controlled, the light ray angles in the marginal field can be within a reasonable range, and combined with the object-side outer diameter of the fourth spacer element, the marginal light can be effectively absorbed.

[0053] In this embodiment, the following condition is satisfied among the effective focal length f4 of the fourth lens, the object-side outer diameter D4s of the fourth spacer element, and the object-side inner diameter d4s of the fourth spacer element: -0.95 < f4 / (D4s - d4s) ≤ -0.70. By reasonably controlling the relationship between the effective focal length of the fourth lens and the difference between the object-side outer and inner diameters of the fourth spacer element within a certain range, it is possible to reasonably balance the positive third-order spherical aberration and the posterior fifth-order spherical aberration generated by the front and rear optical elements, which is beneficial to improving the imaging quality of the on-axis field of view.

[0054] In this embodiment, the following condition is satisfied between the maximum outer diameter OD1 of the first lens and the maximum outer diameter OD2 of the second lens: 18.00 < OD1 / (OD2 - OD1) < 23.00. By controlling the maximum outer diameters of the first lens and the second lens, the aperture size at the front end of the optical imaging lens can be ensured. While ensuring the uniform wall thickness of the lens barrel, the head space of the lens can be made smaller, which is beneficial for the optical imaging lens to achieve a miniaturized design.

[0055] In this embodiment, the following condition is satisfied among the effective focal length f2 of the second lens, the central thickness CT2 of the second lens, and the object-side outer diameter D2s of the second spacer element: 0.28mm -1 < f2 / CT2 / D2s < 0.90mm -1 . By controlling the effective focal length of the second lens, the light path inside the lens can be better controlled. By controlling the central thickness of the second lens and the object-side outer diameter of the second spacer element, the overall thickness of the second lens can be made more uniform and reasonable. While ensuring better molding, it is possible to prevent the ineffective light path outside the aspherical surface edge from entering the subsequent optical system, reducing the generation and intensity of stray light, and improving the imaging quality.

[0056] In this embodiment, the following condition is satisfied among the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, and the object-side outer diameter D3s of the third spacer element: 0.15mm -1 < f3 / CT3 / D3s < 0.35mm -1 . By controlling this condition, while ensuring the additivity of the third lens, the ghost images generated by the third lens can be effectively improved, which is beneficial to reducing the overall stray light of the optical imaging lens.

[0057] In this embodiment, the first lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the sixth lens has negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; and the image side surface of the sixth lens is concave. By reasonably planning the focal power and surface shape of each lens, the light from the first lens through the middle lens to the last lens can be more reasonably controlled, which is conducive to avoiding ghost images, and at the same time makes the structure of the entire optical imaging lens more reasonable, the wall thickness of the lens barrel more uniform, reduces the processing difficulty of the lens barrel, and improves the stability of the optical imaging lens.

[0058] In this embodiment, the spacing distance EP45 from the fourth spacing element to the fifth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the maximum thickness CP5 of the fifth spacing element and the center thickness CT4 of the fourth lens satisfy: -0.20<(EP45-CP4-CP5) / CT4<3.70. By controlling the relationship between the fourth lens and the fourth spacing element, the optimal bearing position can be adopted for the fourth lens, which is used to improve the assembly stability and reduce the field curvature change of the external field after high temperature and high humidity; by controlling the maximum thickness of the fifth spacing element and the center thickness of the fourth lens, the edge thickness and outer diameter of the lens can be effectively controlled, and the limit process during lens production can be improved, thereby improving the assembly stability and optical performance of the optical imaging lens. Preferably, 0.30<(EP45-CP4-CP5) / CT4<3.70.

[0059] In this embodiment, the center thickness CT2 of the second lens, the center thickness CT5 of the fifth lens, the center thickness CT3 of the third lens and the center thickness CT4 of the fourth lens satisfy: 1.70<(CT2+CT5) / (CT3+CT4)<2.40; the spacing distance EP23 from the second spacer element to the third spacer element along the optical axis, the spacing distance EP34 from the third spacer element to the fourth spacer element along the optical axis and the spacing distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis satisfy: 1.35<(EP23+EP34) / EP45<2.45. By reasonably controlling the center thickness of each lens, the thickness ratio of the lens itself is ensured to be within a certain range, which is conducive to molding, and the convergence trend of the incident light through each lens can be ensured, so that the main light in the incident light is transmitted in each lens according to a predetermined path; controlling the distance between each spacer element can effectively block the redundant light path between the effective diameters of the aspheric surface, reduce the risk of stray light, and improve the imaging quality of the entire optical imaging lens.

[0060] Optionally, the optical imaging lens in the embodiments of the present application can be simulated through software and / or tools such as ZEMAX, CODEV, etc. During the simulation using the above-mentioned software and / or tools, the surface profiles of the respective lenses can be appropriately adjusted according to the surface profiles自带 by the used software and / or tool.

[0061] In addition, in another alternative embodiment of the present application, an optical imaging lens is further provided. The optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the image side surface of the sixth lens is concave; the spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; between the effective focal length f2 of the second lens, the spacing distance EP12 along the optical axis direction from the first spacer element to the second spacer element, and the central thickness CT2 of the second lens, it satisfies: 7.05mm < f2 / (EP12 / CT2) < 16.40mm; between the effective focal length f4 of the fourth lens, the outer diameter D4s on the object side of the fourth spacer element, and the inner diameter d4s on the object side of the fourth spacer element, it satisfies: -0.95 < f4 / (D4s - d4s) < -0.70; between the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, and the outer diameter D3s on the object side of the third spacer element, it satisfies: 0.15mm -1 < f3 / CT3 / D3s < 0.35mm -1 。

[0062] The optical imaging lens of the present application is composed of a lens barrel, six lenses disposed in the lens barrel, and a plurality of spacer elements. By reasonably distributing the optical powers and surface profiles of the six lenses, the positions of the first spacer element to the fourth spacer element, and setting the optical imaging lens to satisfy 7.05mm < f2 / (EP12 / CT2) < 16.40mm, -0.95 < f4 / (D4s - d4s) < -0.70, and 0.15mm -1<f3 / CT3 / D3s<0.35mm -1 , which can reasonably constrain the thickness of the second lens, and at the same time constrain the thickness ratio of the central effective diameter area and the edge structure area of ​​the second lens, thereby reducing the optical sensitivity of the second lens. By reasonably controlling the relationship between the effective focal length of the fourth lens and the difference between the inner and outer diameters of the object side of the fourth spacing element within a certain range, the positive third-order spherical aberration and the rear fifth-order spherical aberration generated by the front and rear optical elements can be reasonably balanced, which is beneficial to improving the imaging quality of the on-axis field of view. By controlling the effective focal length of the third lens, the central thickness of the third lens and the outer diameter of the object side of the third spacing element, while ensuring the additivity of the third lens, the ghost image generated by the third lens can be effectively improved, which is beneficial to improving the overall stray light quality of the optical imaging lens.

[0063] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0064] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0065] The optical imaging lens in the present application may use multiple lenses, such as the six lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0066] 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 six lenses are described as an example in the embodiments, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0067] Figure 1 and Figure 2 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 The parameters such as D5s, D4s, D3s, D2s, D1s, d4s, EP01, EP12, EP23, EP34, L, CP4, EP45, CP5 are indicated in the figure. Figure 2OD1, OD2, and SAG01 are marked in the middle to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0068] 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. It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3; in embodiment 4, there are three examples of embodiment 4-1, embodiment 4-2, and embodiment 4-3. The parameters such as the radius of curvature, center thickness, and spacing distance between lenses and high-order coefficients of the optical imaging lens in the three examples of the same embodiment are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the fifth spacing element are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0069] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0070] Embodiment 1

[0071] like Figures 3 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 3 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 4 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-2 is shown, Figure 5 The schematic diagram of the structure of the optical imaging lens of Embodiment 1-3 is shown.

[0072] like Figures 3 to 5 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fourth auxiliary spacing element P4b, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0073] like Figure 3, which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface of the fourth auxiliary spacer element P4b, and the image side surface of the fourth auxiliary spacer element P4b is respectively in contact with the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens.

[0074] like Figure 4 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0075] like Figure 5 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-3. In this example, a fifth auxiliary spacer element P5b is further provided on the image side of the fifth spacer element P5, and the object side surface and image side surface of the fifth auxiliary spacer element P5b are respectively abutted against the image side surface of the fifth spacer element P5 and the object side surface S11 of the sixth lens. The abutting manner of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0076] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2. (Unit: mm)

[0077] Table 2

[0078] Example / Parameters D1s D2s D3s d4s D4s D5s EP01 EP12 EP23 1-1 8.100 8.300 8.500 4.472 8.900 11.100 0.895 2.765 1.754 1-2 8.300 8.500 8.700 4.472 9.100 11.300 0.845 2.765 1.854 1-3 8.000 8.200 8.400 4.472 8.800 10.143 0.745 2.747 1.928 Parameters\Example EP34 CP4 EP45 CP5 L SAG01 OD1 OD2 ∑CP 1-1 1.828 0.022 2.563 0.022 14.000 0.538 7.700 8.100 0.955 1-2 1.729 0.022 2.462 0.022 14.000 0.538 7.900 8.300 0.856 1-3 1.668 0.022 2.088 0.722 14.000 0.538 7.600 8.000 1.677

[0079] In Embodiment 1, 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 concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. 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 convex surface. 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 object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface.

[0080] In Embodiment 1, half of the maximum field of view Semi-FOV of the optical imaging lens is 68.56°, the total effective focal length f of the optical imaging lens is 3.937 mm, the effective focal length f1 of the first lens is -6.913 mm, the effective focal length f2 of the second lens is 18.084 mm, the effective focal length f3 of the third lens is 3.490 mm, the effective focal length f4 of the fourth lens is -3.841 mm, the effective focal length f5 of the fifth lens is 3.463 mm, and the effective focal length f6 of the sixth lens is -4.967 mm.

[0081] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0082] Table 3

[0083]

[0084]

[0085] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the sixth lens E6 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0086]

[0087] 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, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 3; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 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-S12 in Example 1.

[0088] Table 4

[0089]

[0090]

[0091] Figure 6 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature.

[0092] according to Figure 6 and Figure 7It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0093] Embodiment 2

[0094] like Figures 8 to 12 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig. 9 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-2. Fig.10 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0095] like Figures 8 to 10 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0096] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens.

[0097] like Fig. 9 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0098] like Fig.10 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0099] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5. (Unit: mm)

[0100] Table 5

[0101]

[0102]

[0103] In the second embodiment, 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 concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. 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 convex surface. 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 object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface.

[0104] In Example 2, half of the maximum field of view Semi-FOV of the optical imaging lens is 64.91°, the total effective focal length f of the optical imaging lens is 4.018 mm, the effective focal length f1 of the first lens is -7.020 mm, the effective focal length f2 of the second lens is 14.493 mm, the effective focal length f3 of the third lens is 3.776 mm, the effective focal length f4 of the fourth lens is -4.191 mm, the effective focal length f5 of the fifth lens is 3.967 mm, and the effective focal length f6 of the sixth lens is -4.740 mm.

[0105] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0106] Table 6

[0107]

[0108] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirror surfaces S1-S12 in Example 2.

[0109] Table 7

[0110]

[0111]

[0112] Fig.11The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.12 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature.

[0113] according to Fig.11 and Fig.12 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0114] Embodiment 3

[0115] like Figures 13 to 17 As shown, the optical imaging lens of embodiment 3 is described. Fig.13 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-2. Fig.15 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0116] like Figures 13 to 15 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0117] like Fig.13 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens.

[0118] like Fig.14 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0119] like Fig.15, which is a schematic diagram of the structure of the optical imaging lens of Example 3-3. In this example, a second auxiliary spacer element P2b is further provided on the image side of the second spacer element P2, and the object side surface and image side surface of the second auxiliary spacer element P2b are respectively abutted against the image side surface of the second spacer element P2 and the object side surface S5 of the third lens. The abutting manner of the remaining spacer elements is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and no further description is given here.

[0120] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8. (Unit: mm)

[0121] Table 8

[0122] Example / Parameters D1s D2s D3s d4s D4s D5s EP01 EP12 EP23 1-1 8.109 8.300 8.500 4.259 9.504 11.100 0.759 2.454 1.893 1-2 8.509 8.700 8.900 4.456 9.904 10.700 0.659 2.476 1.971 1-3 7.809 8.000 8.400 4.686 9.204 10.500 0.809 2.454 1.872 Example / Parameters EP34 CP4 EP45 CP5 L SAG01 OD1 OD2 ∑CP 1-1 1.808 0.022 2.475 0.022 13.700 0.317 7.700 8.110 0.110 1-2 1.858 0.022 2.505 0.022 13.700 0.317 8.100 8.510 0.110 1-3 2.111 0.022 2.408 0.022 13.700 0.317 7.400 7.810 0.909

[0123] In the third embodiment, 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 concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. 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 convex surface. 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 object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface.

[0124] In Example 3, half of the maximum field of view Semi-FOV of the optical imaging lens is 54.02°, the total effective focal length f of the optical imaging lens is 4.511 mm, the effective focal length f1 of the first lens is -6.995 mm, the effective focal length f2 of the second lens is 16.267 mm, the effective focal length f3 of the third lens is 3.699 mm, the effective focal length f4 of the fourth lens is -4.131 mm, the effective focal length f5 of the fifth lens is 3.604 mm, and the effective focal length f6 of the sixth lens is -4.215 mm.

[0125] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0126] Table 9

[0127]

[0128] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface S1-S12 in Example 3.

[0129] Table 10

[0130]

[0131]

[0132] Fig.16 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.17 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature.

[0133] according to Fig.16 and Fig.17 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0134] Embodiment 4

[0135] like Figures 18 to 22 As shown, the optical imaging lens of Example 4 is described. Fig.18 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-1. Fig.19 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-2. Fig. 20 A schematic structural diagram of the optical imaging lens of Example 4-3 is shown.

[0136] like Figures 18 to 20 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a second auxiliary spacing element P2b, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a fifth auxiliary spacing element P5b, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0137] like Fig.18, which is a schematic diagram of the structure of the optical imaging lens of Example 4-1. In this example, the object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, and the image side surface of the second auxiliary spacer element P2b is in contact with the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer element P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b, and the image side surface of the fifth auxiliary spacer element P5b is in contact with the object side surface S11 of the sixth lens.

[0138] like Fig.19 FIG. 4 is a schematic diagram of the structure of the optical imaging lens of Example 4-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0139] like Fig. 20 FIG. 4 is a schematic diagram of the structure of the optical imaging lens of Example 4-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0140] In summary, the structural parameters of the optical imaging lens of Example 4 in Example 4-1, Example 4-2, and Example 4-3 are shown in Table 11. (Unit: mm)

[0141] Table 11

[0142]

[0143]

[0144] In Embodiment 4, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave.

[0145] In Example 4, half of the maximum field of view Semi-FOV of the optical imaging lens is 60.01°, the total effective focal length f of the optical imaging lens is 3.822 mm, the effective focal length f1 of the first lens is -6.095 mm, the effective focal length f2 of the second lens is 6.758 mm, the effective focal length f3 of the third lens is 4.495 mm, the effective focal length f4 of the fourth lens is -4.354 mm, the effective focal length f5 of the fifth lens is 4.968 mm, and the effective focal length f6 of the sixth lens is -6.090 mm.

[0146] Table 12 shows a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0147] Table 12

[0148]

[0149] Table 13 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S1-S12 in Example 4.

[0150] Table 13

[0151]

[0152]

[0153] Fig.21 The axial chromatic aberration curve of the optical imaging lens of the fourth embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 22 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature.

[0154] according to Fig.21 and Fig. 22 It can be seen that the optical imaging lens provided in the fourth embodiment can achieve good imaging quality.

[0155] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0156] Table 14

[0157]

[0158]

[0159] Table 15 shows the effective focal length of each lens of the optical imaging lens of Examples 1 to 4, half of the maximum field of view Semi-FOV of the optical imaging lens, and the total effective focal length f of the optical imaging lens.

[0160] Table 15

[0161] Optical parameters / Examples Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Semi-FOV(°) 68.56 64.91 54.02 60.01 f(mm) 3.937 4.018 4.511 3.822 f1(mm) -6.913 -7.020 -6.995 -6.095 f2(mm) 18.084 14.493 16.267 6.758 f3(mm) 3.490 3.776 3.699 4.495 f4(mm) -3.841 -4.191 -4.131 -4.354 f5(mm) 3.463 3.967 3.604 4.968 f6(mm) -4.967 -4.740 -4.215 -6.090

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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 invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of six lenses, and the six lenses are, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; The spacer element group includes a first spacer element disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens; The air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the center thickness CT2 of the second lens satisfy the following: 0.30<(T12+T23) / CT2≤0.80; The half of the maximum field of view angle Semi-FOV of the optical imaging lens and the maximum axial height L of the lens barrel satisfy the following conditions: 3.90° / mm <Semi-FOV / L<4.95° / mm; The spacing distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacing element along the optical axis, the spacing distance EP23 from the second spacing element to the third spacing element along the optical axis, and the spacing distance EP12 from the first spacing element to the second spacing element along the optical axis satisfy: 0.75<(EP01+EP23) / EP12<1.

17.

2. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens, The center thickness CT2 of the second lens, the center thickness CT3 of the third lens, the center thickness CT5 of the fifth lens and the maximum axial height L of the lens barrel satisfy the following: 0.44<(CT2+CT3+CT5) / L<0.60; The object side outer diameter D5s of the fifth spacing element and the object side outer diameter D1s of the first spacing element satisfy: 1.05 <D5s / D1s<1.40。 3. The optical imaging lens according to claim 1, wherein: The spacing distance EP01 from the object side of the lens barrel to the object side of the first spacing element along the optical axis direction and the distance SAG01 from the intersection of the object side of the first lens and the optical axis to the object side of the lens barrel along the optical axis direction satisfy: 1.35 <EP01 / SAG01<9.55。 4. The optical imaging lens according to claim 1, wherein: The sum of air intervals ΣAT of adjacent lenses from the first lens to the sixth lens on the optical axis and the maximum axial height L of the lens barrel satisfy the following: 0.10<ΣAT / L<0.35; The sum of air intervals ΣAT between adjacent lenses of the first lens to the sixth lens on the optical axis and the sum of maximum thicknesses ΣCP of all spacing elements satisfy the following: 1.35<ΣAT / ΣCP<21.

65.

5. The optical imaging lens according to claim 1, wherein: The sum of air intervals ΣAT between adjacent lenses of the first lens to the sixth lens on the optical axis and the sum of maximum thicknesses ΣCP of all spacing elements satisfy the following: 1.35<ΣAT / ΣCP<2.

75.

6. The optical imaging lens according to claim 1, wherein: The curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens, and the spacing distance EP12 from the first spacing element to the second spacing element along the optical axis direction satisfy: -3.70≤R4×N2 / EP12<-2.

25.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The object side outer diameter D4s of the fourth spacer element, the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -5.45 mm <D4s / (f4 / R8)<-4.85mm。 8. The optical imaging lens according to claim 7, wherein: The effective focal length f4 of the fourth lens, the object side outer diameter D4s of the fourth spacing element and the object side inner diameter d4s of the fourth spacing element satisfy: -0.95 <f4 / (D4s-d4s)≤-0.70。 9. The optical imaging lens according to claim 8, wherein: The maximum outer diameter OD1 of the first lens and the maximum outer diameter OD2 of the second lens satisfy: 18.00 <OD1 / (OD2-OD1)<23.00。 10. The optical imaging lens according to claim 9, characterized in that: The effective focal length f2 of the second lens, the center thickness CT2 of the second lens and the object side outer diameter D2s of the second spacer element satisfy: 0.28 mm -1 <f2 / CT2 / D2s<0.90mm -1 。 11. The optical imaging lens according to claim 10, wherein: The effective focal length f3 of the third lens, the center thickness CT3 of the third lens and the object side outer diameter D3s of the third spacer element satisfy: 0.15 mm -1 <f3 / CT3 / D3s<0.35mm -1 。 12. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens. The spacing distance EP45 from the fourth spacing element to the fifth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the maximum thickness CP5 of the fifth spacing element and the center thickness CT4 of the fourth lens satisfy: -0.2<(EP45-CP4-CP5) / CT4<3.

7.

13. The optical imaging lens according to claim 12, wherein: 0.30<(EP45-CP4-CP5) / CT4<3.70; and / or, The center thickness CT2 of the second lens, the center thickness CT5 of the fifth lens, the center thickness CT3 of the third lens and the center thickness CT4 of the fourth lens satisfy: 1.70<(CT2+CT5) / (CT3+CT4)<2.40; the spacing distance EP23 from the second spacer element to the third spacer element along the optical axis, the spacing distance EP34 from the third spacer element to the fourth spacer element along the optical axis and the spacing distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis satisfy: 1.35<(EP23+EP34) / EP45<2.45.

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