Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, seven lenses and a plurality of spacer elements arranged in the lens barrel, the maximum effective radius DT41 of the object side of the fourth lens, the maximum effective radius DT51 of the object side of the fifth lens satisfy 1.17<DT51 / DT41<1.33, the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side of the fourth spacer element, the inner diameter d4s of the object side of the fourth spacer element satisfy-0.04<(D4s-d4s) / f45<0.81, the inner diameter d4m of the image side of the fourth spacer element and the maximum effective radius DT51 of the object side of the fifth lens satisfy 1.73<d4m / DT51<1.92. The application solves the problem that the optical lens in the prior art has serious stray light caused by correcting the aberration of the middle lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical lens. Background Art

[0002] With the development of electronic devices, more and more electronic devices have a camera function, and the requirements for the imaging quality of optical lenses are gradually increasing. Usually, the number of lenses is increased to improve the imaging quality of the optical lens. However, with the increase in the number of lenses, the negative impacts are also increasing. For example, in order to correct the aberration of the middle lens, the problem of stray light follows. Usually, the aberration can be corrected by restricting the effective diameter of the middle lens, but this easily leads to an increase in the step difference between two adjacent lenses, which easily introduces stray light and affects the imaging quality.

[0003] That is to say, in the prior art, there is a problem that the stray light is serious in the optical lens in order to correct the aberration of the middle lens. Summary of the Invention

[0004] The main object of the present invention is to provide an optical lens to solve the problem that the stray light is serious in the optical lens in the prior art in order to correct the aberration of the middle lens.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical lens including a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis direction from the object side to the image side. The first lens has a positive optical power, the seventh lens has a negative optical power, the object side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the spacer element group at least includes a fourth spacer element, and the fourth spacer element is located between the fourth lens and the fifth lens and is in partial contact with the image side surface of the fourth lens; the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 1.17 < DT51 / DT41 < 1.33; the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -0.04 < (D4s - d4s) / f45 < 0.81; the inner diameter d4m of the image side surface of the fourth spacer element and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 1.73 < d4m / DT51 < 1.92.

[0006] According to another aspect of the present invention, an optical lens is provided, which includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in sequence along the optical axis from the object side to the image side. The first lens has a positive optical power, and the seventh lens has a negative optical power. The spacer element group at least includes a fourth spacer element, which is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens. The following relationships are satisfied between the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT51 of the object side surface of the fifth lens: 1.17 < DT51 / DT41 < 1.33. The following relationship is satisfied among the inner diameter d4s of the object side surface of the fourth spacer element, the curvature radius R8 of the image side surface of the fourth lens, and the refractive index N4 of the fourth lens: 1.95 < R8*N4 / d4s < 5.15.

[0007] According to another aspect of the present invention, an optical lens is provided, which includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in sequence along the optical axis from the object side to the image side. The first lens has a positive optical power, and the seventh lens has a negative optical power. The spacer element group at least includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the fifth spacer element is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens. The following relationship is satisfied among the spacing distance EP45 along the optical axis between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element, the central thickness CT5 of the fifth lens, and the air spacing T45 between the fourth lens and the fifth lens on the optical axis: 0.36 < EP45 / (T45 + CT5) < 0.60. The following relationship is satisfied among the curvature radius R9 of the image side surface of the fifth lens, the curvature radius R10 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element: -4.09 < R10 / d5s + R11 / d5m < 1.13.

[0008] Further, the following relationship is satisfied between the inner diameter d4m of the image side surface of the fourth spacer element and the spacing distance |SAG51| along the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the object side surface of the non-effective diameter region of the fifth lens: 5.40 < d4m / |SAG51| < 14.20.

[0009] Further, the following relationship is satisfied between the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element: -0.26 < d4s / f4 < 0.15.

[0010] Furthermore, the inner diameter d0s of the object-side end face of the lens barrel, the maximum effective radius DT71 of the object-side surface of the seventh lens, and the maximum effective radius DT11 of the object-side surface of the first lens satisfy the following relationship: 2.45 <d0s / (DT71-DT11)<3.40。

[0011] Furthermore, the spacer element group also includes a fifth spacer element, which is located between the fifth and sixth lenses and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, the center thickness CT5 of the fifth lens, and the air gap T45 between the fourth and fifth lenses along the optical axis satisfy: 0.36 <EP45 / (T45+CT5)<0.60。

[0012] Furthermore, the spacer group also includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis and the combined focal length f45 of the fourth and fifth lenses satisfy: 0 ≤ EP45 / f45 < 0.21.

[0013] Furthermore, the spacer group also includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and the spacing distance |SAG51| between the object-side surface of the fifth lens and the intersection of the optical axis and the object-side surface of the fifth lens and the object-side surface of the non-effective diameter region of the fifth lens along the optical axis satisfy the following: 0.38 < |SAG51| / EP45 < 1.24.

[0014] Furthermore, the spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image side of the third lens. The maximum effective radius DT41 of the object side of the fourth lens, the maximum effective radius DT42 of the image side of the fourth lens, and the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis satisfy: 5.28 < (DT41 + DT42) / EP34 < 14.6.

[0015] Furthermore, the spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The outer diameter D3s of the object-side surface of the third spacer element and the outer diameter D4s of the object-side surface of the fourth spacer element satisfy the following relationship: 1.08 <D4s / D3s<1.62。

[0016] Furthermore, the spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer element along the optical axis satisfy: 4.82 <T34 / CP3<6.84。

[0017] Furthermore, the spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The inner diameter d3s of the object-side surface of the third spacer element, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: -0.2 <d3s / (R5+R6)<0.2。

[0018] Furthermore, the spacer element group also includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis and the center thickness CT3 of the third lens satisfy the following condition: 0.56. <EP23 / CT3<1.3。

[0019] Furthermore, the spacer element group also includes a second spacer element, which is located between the second lens and the third lens and contacts the image-side surface of the second lens. The inner diameter d2s of the object-side surface of the second spacer element and the maximum effective radius DT31 of the object-side surface of the third lens satisfy the following condition: 2.00 <d2s / DT31<2.25。

[0020] Furthermore, the spacer element group also includes a second spacer element and a fifth spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface of the second lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The inner diameter d5s of the object-side surface of the fifth spacer element, the inner diameter d2s of the object-side surface of the second spacer element, the effective focal length f5 of the fifth lens, and the effective focal length f2 of the second lens satisfy the following condition: -0.04 < (d5s - d2s) / (f5 - f2) < 0.10.

[0021] Applying the technical solution of the present invention, the optical lens includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses, which are sequentially arranged along the optical axis direction from the object side to the image side, namely the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens. The first lens has a positive optical power, and the seventh lens has a negative optical power. The object side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the spacer element group at least includes a fourth spacer element, and the fourth spacer element is located between the fourth lens and the fifth lens and is in partial contact with the image side surface of the fourth lens; the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 1.17 < DT51 / DT41 < 1.33; the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -0.04 < (D4s - d4s) / f45 < 0.81; the inner diameter d4m of the image side surface of the fourth spacer element and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 1.73 < d4m / DT51 < 1.92.

[0022] The optical lens of the present application consists of a lens barrel, seven lenses and at least one spacer element. When 1.17 < DT51 / DT41 < 1.33, where DT41 is the maximum effective radius of the object side of the fourth lens and DT51 is the maximum effective radius of the object side of the fifth lens, by constraining the relationship between the maximum effective radii of the object sides of the fourth lens and the fifth lens, the apertures of the fourth lens and the fifth lens can be constrained to ensure the aberration correction effect of the fourth lens and the fifth lens, which is beneficial to improving the imaging quality. However, this is likely to cause an excessive step difference between the fourth lens and the fifth lens, and further affect the stray light generated by reflection, scattering or diffraction between the fourth lens and the fifth lens. These stray lights will reduce the contrast of the image and affect the imaging quality, especially in a high-brightness or strong light source environment. In the present application, by constraining (D4s - d4s) / f45 within a reasonable range, the light passing range and blocking range between the fourth lens and the fifth lens can be controlled, ensuring that the size of the fourth spacer element matches the combined focal length of the fourth lens and the fifth lens, reducing the light hitting the mechanical area of the lens, thereby reducing the generation of stray light and improving the stray light problem. If (D4s - d4s) / f45 is less than -0.04, the width of the fourth spacer element is too short, which is likely to cause some light to leak at the edge of the fourth spacer element and become stray light, interfering with the imaging quality. If (D4s - d4s) / f45 is greater than 0.81, the effective length of the fourth spacer element is too long, relative to the combined focal length f45 of the fourth lens and the fifth lens being too large, and the light is reflected and refracted more when passing through the fourth spacer element, which will also increase the generation of stray light. In addition, when the optical lens in the present application further satisfies 1.73 < d4m / DT51 < 1.92, the scattering and diffraction of light at the edge of the fourth spacer element or the edges of the fourth lens and the fifth lens can be reduced, thereby further improving the stray light problem at the fourth lens and the fifth lens. If d4m / DT51 is less than 1.73, the inner diameter of the fourth spacer element is too small, and the fourth spacer element is likely to block the imaging light, thus affecting the illuminance of the optical lens, and at the same time increasing the unnecessary reflection and scattering of light inside the optical lens, resulting in the aggravation of the stray light problem. If d4m / DT51 is greater than 1.92, the inner diameter of the fourth spacer element is too large, which will cause stray light to enter the edge of the fifth lens, and then reflect and scatter in the optical lens to generate new stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 It shows a dimension marking diagram of the optical lens of an optional embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of the optical lens of Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 The diagram shows the structural schematics of the optical lenses of embodiments 1-2 of the present invention;

[0027] Figure 4 The diagram shows the structural schematics of the optical lenses of embodiments 1-3 of the present invention;

[0028] Figures 5 to 7 The on-axis chromatic aberration, astigmatism curves, and distortion curves of the optical lens of Embodiment 1 of the present invention are shown respectively.

[0029] Figure 8 A schematic diagram of the optical lens of Embodiment 2-1 of the present invention is shown;

[0030] Figure 9 A schematic diagram of the optical lens of Embodiment 2-2 of the present invention is shown;

[0031] Figure 10 The diagram shows the structural schematics of the optical lenses of embodiments 2-3 of the present invention;

[0032] Figures 11 to 13 The on-axis chromatic aberration, astigmatism curves, and distortion curves of the optical lens of Embodiment 2 of the present invention are shown respectively.

[0033] Figure 14 A schematic diagram of the optical lens of Embodiment 3-1 of the present invention is shown;

[0034] Figure 15 A schematic diagram of the optical lens of Embodiment 3-2 of the present invention is shown;

[0035] Figure 16 A schematic diagram of the optical lens of Embodiment 3-3 of the present invention is shown;

[0036] Figures 17 to 19 The on-axis chromatic aberration, astigmatism curves, and distortion curves of the optical lens of Embodiment 3 of the present invention are shown respectively;

[0037] Figure 20 An optical path diagram of an optical lens according to an alternative embodiment of the present invention is shown;

[0038] Figure 21 It shows Figure 20 The light spot diagram of the optical lens in the image;

[0039] Figure 22 An optical path diagram of an example optical lens is shown;

[0040] Figure 23 It shows Figure 22 The light spot diagram of the optical lens in the image;

[0041] Figure 24 An optical path diagram of an optical lens is shown in another example;

[0042] Figure 25 It shows Figure 24 The light spot diagram of the optical lens in the image. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the concavity and convexity are judged by the positive and negative values of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software). Taking the object side surface as an example, when the R value is positive, it is judged as convex, and when the R value is negative, it is judged as concave; taking the image side surface as an example, when the R value is positive, it is judged as concave, and when the R value is negative, it is judged as convex. In this application, the left side is the object side and the right side is the image side.

[0049] In order to solve the problem of serious stray light caused by correcting the aberration of the middle lens in the prior art, the present invention provides an optical lens.

[0050] As Figures 1 to 19 shown, the optical lens includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of seven lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis direction from the object side to the image side; the spacer element group at least includes a fourth spacer element, and the fourth spacer element is located between the fourth lens and the fifth lens and is in partial contact with the image side surface of the fourth lens; the following relationships are satisfied among the maximum effective radius DT41 of the object side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens: 1.17 < DT51 / DT41 < 1.33; the following relationships are satisfied among the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element: -0.04 < (D4s - d4s) / f45 < 0.81; the following relationship is satisfied between the inner diameter d4m of the image side surface of the fourth spacer element and the maximum effective radius DT51 of the object side surface of the fifth lens: 1.73 < d4m / DT51 < 1.92.

[0051] The optical lens of the present application consists of a lens barrel, seven lenses and at least one spacer element. The first lens has a positive optical power. By constraining the first lens to have a positive optical power, it is beneficial for large-angle light rays to converge into the optical imaging lens, which is beneficial for increasing the light flux. The seventh lens has a negative optical power, which can balance the aberration brought by the front system and appropriately diverge the light rays transmitted to the imaging surface. When the maximum effective radius DT41 of the object side of the fourth lens and the maximum effective radius DT51 of the object side of the fifth lens satisfy 1.17 < DT51 / DT41 < 1.33, by constraining the relationship between the maximum effective radii of the object sides of the fourth lens and the fifth lens, the apertures of the fourth lens and the fifth lens can be constrained to ensure the aberration correction effect of the fourth lens and the fifth lens, which is beneficial for improving the imaging quality. However, this easily leads to an excessive step difference between the fourth lens and the fifth lens, and further affects the stray light generated by reflection, scattering or diffraction between the fourth lens and the fifth lens. These stray lights will reduce the contrast of the image and affect the imaging quality, especially in a high-brightness or strong light source environment. In the present application, by constraining (D4s - d4s) / f45 within a reasonable range, the light passing range and the blocking range between the fourth lens and the fifth lens can be controlled, ensuring that the size of the fourth spacer element matches the combined focal length of the fourth lens and the fifth lens, reducing the light rays hitting the mechanism area of the lens, thereby reducing the generation of stray light and improving the stray light problem. If (D4s - d4s) / f45 is less than -0.04, the width of the fourth spacer element is too short, which easily causes some light rays to leak at the edge of the fourth spacer element and become stray light, interfering with the imaging quality. If (D4s - d4s) / f45 is greater than 0.81, the effective length of the fourth spacer element is too long, relative to the combined focal length f45 of the fourth lens and the fifth lens being too large, and the light rays are more reflected and refracted when passing through the fourth spacer element, which will also increase the generation of stray light. In addition, when the optical lens in the present application further satisfies 1.73 < d4m / DT51 < 1.92, the scattering and diffraction of light rays at the edge of the fourth spacer element or the edges of the fourth lens and the fifth lens can also be reduced, thereby further improving the stray light problem at the fourth lens and the fifth lens. If d4m / DT51 is less than 1.73, the inner diameter of the fourth spacer element is too small, and the fourth spacer element easily blocks the imaging light rays, thereby affecting the illuminance of the optical lens. At the same time, it will also increase the unnecessary reflection and scattering of light rays inside the optical lens, resulting in the aggravation of the stray light problem. If d4m / DT51 is greater than 1.92, the inner diameter of the fourth spacer element is too large, which will cause stray light to enter the edge of the fifth lens, and then reflect and scatter in the optical lens to generate new stray light.

[0052] In addition, referring to Table 1 below and Figures 20 to 25 as shown, Figure 20The optical path diagram of an optical imaging lens is shown when DT51 / DT41 = 1.19, (D4s - d4s) / f45 = -0.02, d4m / DT51 = 1.88, and the light ray is 21.5°. Figure 21 It shows Figure 20 the spot diagram of the optical imaging lens in Figure 21 and Figure 20 It can be seen that there is no obvious stray light around the central spot, the stray light energy is weakened, the stray light is improved, and the performance is better. Figure 22 The optical path diagram of an optical imaging lens is shown when DT51 / DT41 = 1.19, (D4s - d4s) / f45 = -0.25, d4m / DT51 = 1.47, and the light ray is 21.5°. Figure 23 It shows Figure 22 the spot diagram of the optical imaging lens in Figure 23 It can be seen from Figure 22 that there are dot-like stray lights around the central spot, the stray light energy is strong, the stray light has a great influence on the imaging quality, the performance is poor, and at the same time, combined with Figure 24 It can be known that the stray light is mainly formed by the reflection of the optical structure areas of the fourth lens and the fifth lens. Figure 25 It shows Figure 24 the spot diagram of the optical imaging lens in Figure 25 It can be seen from Figure 24 that there are multiple dot-like stray lights around the central spot, the stray light energy is strong, the stray light has a great influence on the imaging quality, the performance is poor, and at the same time, combined with

[0053] Conditional expression The scope of conditions met (this application) Less than the condition range (Example 1) Greater than the condition range (Example 2) DT51 / DT41 1.19 1.19 1.19 (D4s-d4s) / f45 -0.02 -0.25 1.19 d4m / DT51 1.88 1.47 2.78 Light path diagram and light spot diagram Figure 20 and Figure 21 Figure 22 and Figure 23 Figure 24 and Figure 25

[0054] Table 1

[0055] In the above Figure 20 、 Figure 22 and Figure 24 the incident angle of the light ray is approximately one-fourth of the field angle.

[0056] It should be noted that in this application, (D4s - d4s) / f45 and d4m / DT51 are restricted within a reasonable range to constrain the relationship between the fourth lens, the fourth spacer element, and the fifth lens, so as to control the light transmission path from the fourth lens to the fifth lens and solve the problem of stray light caused when DT51 / DT41 is within the range of 1.17 to 1.33. When (D4s - d4s) / f45 and d4m / DT51 meet the above range, the purpose of improving stray light can be achieved, which does not depend on the optical power of other lenses and the surface shape of the lenses. The optical power and surface shape of other lenses are further optimizations of the optical imaging lens based on this. The optical power of other lenses can be positive or negative according to the design requirements of the actual optical system, and the surface shape of other lenses can be convex or concave according to the design requirements of the optical system. When the optical system satisfies: 1.17 < DT51 / DT41 < 1.33; -0.04 < (D4s - d4s) / f45 < 0.81; 1.73 < d4m / DT51 < 1.92, the optical imaging lens can reduce the influence of stray light while meeting the aberration requirements.

[0057] For example, in some alternative embodiments, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The optical lens can perform lens stray light simulation through software and / or tools such as LIGHTOOS, ASAP, etc. The optical lens in this application uses ASAP for simulation. During the simulation process using software and / or tools such as the above, the surface shape of each lens can be simulated according to the built-in surface shape of the software and / or tool used and adjusted appropriately.

[0058] In some alternative embodiments, the inner diameter d4m of the image side surface of the fourth spacer element, and the distance |SAG51| along the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the object side surface of the non-effective diameter region of the fifth lens satisfy: 5.40 < d4m / |SAG51| < 14.20. By restricting d4m / |SAG51| within a reasonable range, the aberration correction of the optical lens can be optimized while reducing aberration, improving the imaging clarity of the optical lens. At the same time, the relative sizes of the fourth spacer element and the fifth lens are constrained, which helps to optimize the overall size of the optical lens. While maintaining the imaging quality, the size of the optical lens is reduced, so as to facilitate increasing the application range of the optical lens. Limiting the inner diameter of the fourth spacer element can ensure the shielding range of the fifth lens and reduce the entry of stray light into the rear optical system.

[0059] In some optional embodiments, the following relationship is satisfied between the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element: -0.26 < d4s / f4 < 0.15. By constraining d4s / f4 within a reasonable range, the deflection angle of light in the fourth lens can be controlled, facilitating the imaging light to smoothly pass through the fourth spacer element and enter the rear optical system. Constraining the relationship between the inner diameter of the object side surface of the fourth spacer element and the effective focal length of the fourth lens can reduce imaging defects such as aberration and distortion, improve the imaging clarity and accuracy of the system, and at the same time enhance the reliability of the optical lens under conditions such as temperature change and vibration.

[0060] In some optional embodiments, the following relationship is satisfied among the inner diameter d0s of the object side end face of the lens barrel, the maximum effective radius DT71 of the object side surface of the seventh lens, and the maximum effective radius DT11 of the object side surface of the first lens: 2.45 < d0s / (DT71 - DT11) < 3.40. By constraining d0s / (DT71 - DT11) within a reasonable range and restricting the relationship between the aperture of the object side end of the lens barrel and the maximum effective radius of the lens within the lens group, the relative dimensions of the lens within the lens group and the aperture of the object side end face of the lens barrel can be ensured, reducing the movement or deformation of the lens within the lens barrel, which is beneficial to improving the assembly stability of the optical lens and ensuring the long-term performance of the optical system.

[0061] In some optional embodiments, the spacer element group further includes a fifth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and is partially in contact with the image side surface of the fifth lens. The following relationship is satisfied among the spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, the central thickness CT5 of the fifth lens, and the air spacing T45 between the fourth lens and the fifth lens on the optical axis: 0.36 < EP45 / (T45 + CT5) < 0.60. By constraining EP45 / (T45 + CT5) within a reasonable range, the manufacturing and assembly accuracy can be improved. Even if there are certain errors, the optical system can still maintain good imaging performance. At the same time, the edge thickness and central thickness of the fifth lens can be constrained within a reasonable range to ensure the structural strength of the fifth lens and improve the assembly stability. At the same time, restricting the air spacing between the fourth lens and the fifth lens helps to optimize the light transmission efficiency between the lenses, reduce light loss and scattering, and improve the overall performance of the optical system.

[0062] In some optional embodiments, the spacer group further includes a fifth spacer element, located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and the combined focal length f45 of the fourth and fifth lenses, satisfy: 0 ≤ EP45 / f45 < 0.21. By constraining EP45 / f45 within a reasonable range, the spacing between the fourth and fifth spacers can be ensured to be within a reasonable range, avoiding space waste caused by an excessively large spacing between the fourth and fifth spacers, and also avoiding excessive compactness of the optical system structure caused by an excessively small spacing between the fourth and fifth spacers, which would significantly affect manufacturing tolerances. Simultaneously, the combined focal length of the fourth and fifth lenses affects the converging or diverging ability of these two lens combinations. Constraining EP45 / f45 can indirectly control the range of the combined focal length f45, thereby optimizing the focal length adjustment capability of the optical system.

[0063] In some optional embodiments, the spacer group further includes a fifth spacer element located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and the spacing distance |SAG51| between the object-side surface of the fifth lens and the intersection of the optical axis and the object-side surface of the fifth lens and the non-effective diameter region along the optical axis satisfy the following: 0.38 < |SAG51| / EP45 < 1.24. By precisely controlling the ratio of |SAG51| to EP45, aberration correction of the optical system can be optimized, especially aberrations such as field curvature and distortion, thereby improving image quality. At the same time, a reasonable ratio of |SAG51| to EP45 helps ensure the compactness of the optical system. If |SAG51| is too large, it may lead to an increase in the overall size of the optical system, while if EP45 is too large, it may waste space and is not conducive to the compact design of the system.

[0064] In some optional embodiments, the spacer group further includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The maximum effective radius DT41 of the object-side surface of the fourth lens, the maximum effective radius DT42 of the image-side surface of the fourth lens, and the spacing EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis satisfy the following condition: 5.28 < (DT41 + DT42) / EP34 < 14.6. By constraining (DT41 + DT42) / EP34 within a reasonable range, the size and shape of the fourth lens can be constrained. Simultaneously, constraining the distance between the third and fourth spacers helps to constrain the edge thickness of the fourth lens, thereby reducing the overall size of the optical system while ensuring image quality.

[0065] In some optional embodiments, the spacer element group further includes a third spacer element. The third spacer element is located between the third lens and the fourth lens and contacts a part of the image side surface of the third lens. The following condition is satisfied between the outer diameter D3s of the object side surface of the third spacer element and the outer diameter D4s of the object side surface of the fourth spacer element: 1.08 < D4s / D3s < 1.62. By restricting D4s / D3s within a reasonable range, unnecessary spacer elements can be reduced or their sizes can be adjusted while ensuring the performance of the optical system, which can reduce material costs and processing costs. At the same time, the reasonable proportional relationship also helps to improve the stability and durability of the system, thereby reducing maintenance costs. Meanwhile, restricting the outer diameters of the object side surfaces of the third spacer element and the fourth spacer element is beneficial to controlling the inner diameter size of the lens barrel, which is conducive to the miniaturization of the optical lens while ensuring the structural strength of the lens barrel.

[0066] In some optional embodiments, the spacer element group further includes a third spacer element. The third spacer element is located between the third lens and the fourth lens and contacts a part of the image side surface of the third lens. The following condition is satisfied between the air gap T34 on the optical axis between the third lens and the fourth lens and the maximum thickness CP3 of the third spacer element along the optical axis direction: 4.82 < T34 / CP3 < 6.84. By restricting T34 / CP3 within a reasonable range, aberration can be reduced, resolution and contrast can be improved, etc. Restricting the air gap on the optical axis between the third lens and the fourth lens and the maximum thickness of the third spacer element along the optical axis direction within a reasonable range helps to reduce the scattering and absorption of light at the third lens, the fourth lens, and the third spacer element, thereby improving the light transmittance of the optical lens and helping to improve the relative illumination.

[0067] In some optional embodiments, the spacer element group further includes a third spacer element. The third spacer element is located between the third lens and the fourth lens and contacts a part of the image side surface of the third lens. The following condition is satisfied among the inner diameter d3s of the object side surface of the third spacer element, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens: -0.2 < d3s / (R5 + R6) < 0.2. By restricting d3s / (R5 + R6) within a reasonable range, it helps to reduce the aberration in the optical system, especially spherical aberration and coma, etc. At the same time, it can enhance the mechanical stability of the optical system and reduce the displacement caused by vibration or temperature changes. In addition, restricting the relationship among the inner diameter d3s of the object side surface of the third spacer element, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens is beneficial to controlling the deflection degree of light in the third lens, so that the imaging light can smoothly pass through the third spacer element. At the same time, the third spacer element blocks the non-imaging light emitted from the third lens, which is beneficial to reducing the stray light entering the rear system, thereby improving the imaging quality.

[0068] In some optional embodiments, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts a part of the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts a part of the image side surface of the third lens. The distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction and the central thickness CT3 of the third lens satisfy: 0.56 < EP23 / CT3 < 1.3. By constraining EP23 / CT3 within a reasonable range, the spatial layout of the optical system can be optimized, and the reasonable positional relationship among the second spacer element, the third spacer element, and the third lens can be ensured, thereby avoiding unnecessary loss and interference of light in the optical system, and at the same time contributing to reducing aberrations in the optical system, especially field curvature and distortion, etc. In addition, the relationship between the edge thickness and the central thickness of the third lens can also be constrained to ensure the structural strength of the third lens, improve the assembly stability of the optical lens, and at the same time reduce the appearance of welding marks on the third lens and the risk of stray light generated at the welding mark position.

[0069] In some optional embodiments, the spacer element group further includes a second spacer element. The second spacer element is located between the second lens and the third lens and contacts a part of the image side surface of the second lens. The inner diameter d2s of the object side surface of the second spacer element and the maximum effective radius DT31 of the object side surface of the third lens satisfy: 2.00 < d2s / DT31 < 2.25. By constraining d2s / DT31 within a reasonable range, it is ensured that the light passing through the second spacer element can smoothly enter the third lens, and at the same time, the risk of introducing stray light due to the excessive aperture of the object side surface of the third lens is avoided, ensuring that the light can propagate along the expected path when passing through the optical system, reducing unnecessary reflections and scattering, and thus reducing the influence of stray light and ghost images.

[0070] In some optional embodiments, the spacer element group further includes a second spacer element and a fifth spacer element. The second spacer element is located between the second lens and the third lens and contacts a part of the image side surface of the second lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts a part of the image side surface of the fifth lens. The inner diameter d5s of the object side surface of the fifth spacer element, the inner diameter d2s of the object side surface of the second spacer element, the effective focal length f5 of the fifth lens, and the effective focal length f2 of the second lens satisfy: -0.04 < (d5s - d2s) / (f5 - f2) < 0.10. By constraining (d5s - d2s) / (f5 - f2) within a reasonable range, the size and focal length relationship of the above optical elements are precisely controlled, effectively reducing the adjustment difficulty and workload during the assembly process, thereby improving the assembly efficiency and accuracy. At the same time, the deflection degree of light in the second lens and the fifth lens is controlled to ensure that the light is transmitted along the preset path and the imaging quality of the optical lens is guaranteed.

[0071] In another alternative embodiment of the present application, the optical lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses, which are, in order along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The spacer element group includes at least a fourth spacer element, which is located between the fourth lens and the fifth lens and is in partial contact with the image side surface of the fourth lens. The following relationships are satisfied between the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT51 of the object side surface of the fifth lens: 1.17 < DT51 / DT41 < 1.33. The following relationships are satisfied between the inner diameter d4s of the object side surface of the fourth spacer element, the curvature radius R8 of the image side surface of the fourth lens, and the refractive index N4 of the fourth lens: 1.95 < R8*N4 / d4s < 5.15.

[0072] The optical lens of the present application consists of a lens barrel, seven lenses, and at least one spacer element. When 1.17 < DT51 / DT41 < 1.33 is satisfied between the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT51 of the object side surface of the fifth lens, by constraining the relationship between the maximum effective radii of the object side surfaces of the fourth lens and the fifth lens, the apertures of the fourth lens and the fifth lens can be constrained to ensure the aberration correction effect of the fourth lens and the fifth lens, which is beneficial to improving the imaging quality. However, this easily leads to an excessive step difference between the fourth lens and the fifth lens, thereby affecting the stray light generated by reflection, scattering, or diffraction between the fourth lens and the fifth lens. These stray lights will reduce the contrast of the image and affect the imaging quality, especially in a high-brightness or strong light source environment. By constraining R8*N4 / d4s within a reasonable range, the present application can control the optical path of light in the fourth lens, and further control the angular range of the light exiting the fourth lens, so that the angular range of the light exiting the fourth lens is correlated with the inner diameter of the fourth spacer element, ensuring that the imaging light passes through the fourth spacer element smoothly. At the same time, the fourth spacer element blocks the non-imaging light, reducing the stray light generated in the structural region between the fourth lens and the fifth lens, which is beneficial to improving the imaging quality of the optical lens.

[0073] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0074] In another optional embodiment of the present application, the optical lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis from the object side to the image side. The spacer element group includes at least a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and is partially in contact with the image side surface of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and is partially in contact with the image side surface of the fifth lens. The spacing distance EP45 along the optical axis between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element, the central thickness CT5 of the fifth lens, and the air spacing T45 between the fourth lens and the fifth lens on the optical axis satisfy: 0.36 < EP45 / (T45 + CT5) < 0.60. The radius of curvature R9 of the image side surface of the fifth lens, the radius of curvature R10 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -4.09 < R10 / d5s + R11 / d5m < 1.13.

[0075] The optical lens of the present application consists of a lens barrel, seven lenses, and at least two spacer elements. When the spacing distance EP45 along the optical axis between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element, the central thickness CT5 of the fifth lens, and the air spacing T45 between the fourth lens and the fifth lens on the optical axis satisfy: 0.36 < EP45 / (T45 + CT5) < 0.60, the spacing distance EP45 along the optical axis between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element is relatively small with respect to (T45 + CT5), resulting in a relatively large distance between the structural region of the image side surface of the fifth lens and the center of the image side surface of the fifth lens on the optical axis. This easily causes the optical effective region of the image side surface of the fifth lens to be closer to the image side surface with respect to the structural region of the object side surface of the sixth lens. When light exits from the image side surface of the fifth lens, it is prone to deflect into the optical structure region of the sixth lens, and the light reflects and scatters in the optical structure region of the sixth lens, thereby forming stray light. By constraining R10 / d5s + R11 / d5m within a reasonable range, the present application can control the deflection angle of light on the image side surface of the fifth lens and the object side surface of the sixth lens, and at the same time limit the inner diameter size of the fifth spacer element to absorb the light deflected into the optical structure region of the sixth lens, thereby reducing the stray light formed in the optical structure region of the sixth lens.

[0076] Of course, other parametric expressions in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0077] Optionally, the above optical lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0078] The optical lens in this application may employ multiple lenses, such as the seven lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0079] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0080] Figure 1 A schematic diagram showing the dimensions of an optical lens according to this application is provided. Figure 1 The parameters d2s, d3s, D3s, d4s, d4m, D4s, d0s, d5s, d0s, CP3, EP23, EP34, EP45, and |SAG51| are clearly and intuitively illustrated to provide a clear understanding of their meaning. To facilitate the description of the optical lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0081] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0082] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 2-3. In the three examples within the same embodiment, the curvature radius, center thickness, and other parameters of the optical lens from the first to the seventh lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, the second spacer element, and the third spacer element, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0083] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to this application.

[0084] Example 1

[0085] like Figures 2 to 7 As shown, the optical lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical lens structure of Embodiments 1-2 is shown. Figure 4 A schematic diagram of the optical lens structure of Embodiments 1-3 is shown.

[0086] like Figures 2 to 4 As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, and a seventh spacer element P7.

[0087] like Figure 2 The diagram shows a schematic of the optical lens structure of Embodiment 1-1. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel. The object-side surface and image-side surface of the first spacer element are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer element are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer element are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface of the seventh spacer element is in contact with the image-side surface S14 of the seventh lens.

[0088] like Figure 3 The diagram shows a schematic of the optical lens structure of Embodiment 1-2. The optical lens also includes a first main auxiliary spacer element P1b, a first auxiliary spacer element P1c, and a sixth main auxiliary spacer element P6b. The first main auxiliary spacer element P1b and the first auxiliary spacer element P1c are located between the first spacer element P1b and the second lens E2. The first auxiliary spacer element P1c is in contact with the object side surface of the second lens. The sixth main auxiliary spacer element P6b is located between the sixth auxiliary spacer element P6b and the seventh lens E7. The contact and abutment methods of other spacer elements are similar to those in Embodiment 1-1, and can be referred to the relevant descriptions in Embodiment 1-1, which will not be repeated here.

[0089] like Figure 4 The diagram shows a schematic representation of the optical lens in Embodiments 1-3. The optical lens also includes a first primary auxiliary spacer element P1b, a first auxiliary spacer element P1c, a sixth primary auxiliary spacer element P6b, and a sixth secondary auxiliary spacer element P6c. The first primary auxiliary spacer element P1b and the first auxiliary spacer element P1c are located between the first spacer element P1b and the second lens E2. The first auxiliary spacer element P1c is in contact with the object-side surface of the second lens. The sixth primary auxiliary spacer element P6b and the sixth secondary auxiliary spacer element P6c are located between the sixth auxiliary spacer element P6b and the seventh lens E7. The sixth secondary auxiliary spacer element P6c is in contact with the object-side surface of the seventh lens. The contact and abutment methods of the other spacer elements are similar to those in Embodiments 1-1, and can be referred to the relevant descriptions in Embodiments 1-1, which will not be repeated here.

[0090] In summary, the structural parameters of the optical lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 9.

[0091] In Embodiment 1, the first lens has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fifth lens has negative optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 2 below, OBJ is the object plane, STO is the aperture stop, the aperture stop is located on the first lens, S15 and S16 are the object side and image side of the filter or protective glass, respectively, and S17 is the imaging plane.

[0092] Table 2 shows the basic structural parameters of the optical lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0093]

[0094]

[0095] Table 2

[0096] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical.

[0097] The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0098]

[0099] Where x is the distance vector from the vertex of the aspherical surface 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 reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1-S14 in Example 1.

[0100] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.4070E-04 2.0635E-03 -1.5607E-03 6.9748E-04 -2.0161E-04 3.7098E-05 -4.2503E-06 2.7533E-07 -7.6724E-09 S2 9.4494E-03 -7.7669E-03 3.5432E-03 -1.2859E-03 3.3108E-04 -5.6376E-05 5.9900E-06 -3.5934E-07 9.2661E-09 S3 1.5237E-02 -1.1100E-02 4.2166E-03 -1.0823E-03 1.8531E-04 -8.9003E-06 -2.9654E-06 5.5619E-07 -2.9834E-08 S4 9.1548E-04 -2.4641E-03 1.7814E-03 -1.0922E-03 4.6078E-04 -1.0545E-04 1.2185E-05 -5.1368E-07 -6.2326E-09 S5 5.2699E-03 -4.6850E-03 3.3287E-03 -2.4488E-03 1.0752E-03 -2.9025E-04 4.7000E-05 -4.1250E-06 1.5026E-07 S6 -6.3120E-03 -8.6990E-05 2.3264E-03 -2.1027E-03 8.6928E-04 -2.2399E-04 3.5806E-05 -3.1439E-06 1.1357E-07 S7 6.9832E-05 -1.1149E-02 7.4656E-03 -3.7487E-03 1.3770E-03 -3.5607E-04 5.8663E-05 -5.3731E-06 2.0534E-07 S8 1.1241E-02 -1.3219E-02 6.0653E-03 -2.1098E-03 5.4312E-04 -1.0118E-04 1.2850E-05 -9.8239E-07 3.3540E-08 S9 1.3251E-02 -1.3344E-03 -1.9877E-03 1.2989E-03 -4.2230E-04 7.8706E-05 -8.4271E-06 4.7893E-07 -1.1124E-08 S10 -3.8161E-02 1.3799E-02 -4.8774E-03 1.4149E-03 -2.8841E-04 3.7283E-05 -2.8398E-06 1.1517E-07 -1.9079E-09 S11 7.2205E-03 -2.6350E-03 -7.6442E-04 3.8370E-04 -7.3011E-05 6.8896E-06 -3.0998E-07 4.5884E-09 4.1229E-11 S12 3.2530E-02 -1.2397E-02 1.9822E-03 -1.6228E-04 6.1318E-07 1.0667E-06 -8.7748E-08 2.9367E-09 -3.6716E-11 S13 -4.4929E-02 4.5008E-03 -1.4765E-04 -2.9946E-06 3.9503E-07 -1.3256E-08 2.1719E-10 -1.7618E-12 5.5884E-15 S14 -1.8380E-02 1.4712E-03 -4.7890E-05 9.0421E-07 -9.8897E-08 6.3763E-09 -1.6953E-10 2.0199E-12 -9.0139E-15

[0101] Table 3

[0102] Figure 5 The on-axis chromatic aberration curve of the optical lens of Embodiment 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 6 The astigmatism curve of the optical lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the optical lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0103] according to Figures 5 to 7 As can be seen, the optical lens given in Example 1 can achieve good imaging quality.

[0104] Example 2

[0105] like Figures 8 to 13 As shown, the optical lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical lens of Embodiment 2-2 is shown. Figure 10 A schematic diagram of the optical lens of Embodiments 2-3 is shown.

[0106] like Figures 8 to 10As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth main auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, a fifth main auxiliary spacer element P5b, a sixth lens E6, a sixth spacer element P6, a sixth main auxiliary spacer element P6b, a seventh lens E7, and a seventh spacer element P7.

[0107] like Figure 8 The diagram shows a schematic of the optical lens structure of Embodiment 2-1. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel. The object-side surface and image-side surface of the first spacer element are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element are in contact with the image-side surface S8 of the fourth lens and the object-side surface of the fourth main auxiliary spacer element, respectively. The image-side surface of the fourth main auxiliary spacer element is in contact with the object-side surface S9 of the fifth lens. The object-side surface and image-side surface of the fifth spacer element are in contact with the image-side surface S10 of the fifth lens and the object-side surface of the fifth main auxiliary spacer element, respectively. The image-side surface of the fifth main auxiliary spacer element is in contact with the object-side surface S11 of the sixth lens. The object-side and image-side surfaces of the sixth spacer element are in contact with the image-side surface S12 of the sixth lens and the object-side surface of the sixth main auxiliary spacer element, respectively. The image-side surface of the sixth main auxiliary spacer element is in contact with the object-side surface S13 of the seventh lens. The object-side surface of the seventh spacer element is in contact with the image-side surface S14 of the seventh lens.

[0108] like Figure 9 The diagram shown is a schematic representation of the optical lens in Embodiment 2-2. The optical lens also includes a fourth auxiliary spacer element P4c and a fifth auxiliary spacer element P5c. The fourth auxiliary spacer element P4c is located between the fourth main auxiliary spacer element P4b and the fifth lens E5, and the fifth auxiliary spacer element P5c is located between the fifth main auxiliary spacer element P5b and the sixth lens E6. The contact methods of the other spacer elements are similar to those in Embodiment 2-1, and can be found in the relevant descriptions in Embodiment 2-1; they will not be repeated here.

[0109] like Figure 10The diagram shows a schematic of the optical lens in Embodiment 2-3. The optical lens also includes a fourth auxiliary spacer element P4c, a fifth auxiliary spacer element P5c, and a sixth auxiliary spacer element P6c. The fourth auxiliary spacer element P4c is located between the fourth main auxiliary spacer element P4b and the fifth lens E5. The fifth auxiliary spacer element P5c is located between the fifth main auxiliary spacer element P5b and the sixth lens E6. The sixth auxiliary spacer element P6c is located between the sixth main auxiliary spacer element P6b and the seventh lens E7. The contact methods of the other spacer elements are similar to those in Embodiment 2-1, and can be found in the relevant descriptions in Embodiment 2-1; they will not be repeated here.

[0110] In summary, the structural parameters of the optical lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 9.

[0111] In Embodiment 2, the first lens has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fifth lens has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 4 below, OBJ is the object plane, STO is the aperture stop, the aperture stop is located on the first lens, S15 and S16 are the object side and image side of the filter or protective glass, respectively, and S17 is the imaging plane.

[0112] Table 4 shows the basic structural parameters of the optical lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0113]

[0114] Table 4

[0115] Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspherical.

[0116]

[0117]

[0118] Table 5

[0119] Figure 11 The on-axis chromatic aberration curve of the optical lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 12 The astigmatism curve of the optical lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curve of the optical lens in Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0120] according to Figures 11 to 13 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0121] Example 3

[0122] like Figures 14 to 19 As shown, the optical lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical lens of Embodiment 3-2 is shown. Figure 16 A schematic diagram of the optical lens of Embodiment 3-3 is shown.

[0123] like Figures 14 to 16 As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a sixth main auxiliary spacer element P6b, a seventh lens E7, and a seventh spacer element P7.

[0124] like Figure 14The diagram shows a schematic of the optical lens structure of Embodiment 3-1. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel. The object-side surface and image-side surface of the first spacer element are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer element are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer element are in contact with the image-side surface S12 of the sixth lens and the object-side surface of the sixth main auxiliary spacer element, respectively. The image-side surface of the sixth main auxiliary spacer element is in contact with the object-side surface S13 of the seventh lens. The object side of the seventh spacer element is in contact with the image side S14 of the seventh lens.

[0125] like Figure 15 The diagram shown is a structural schematic of the optical lens of Embodiment 3-2. The bearing and contact methods of the other spacer elements are similar to those of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0126] like Figure 16 The diagram shown is a structural schematic of the optical lens in Embodiment 3-3. The optical lens also includes a sixth auxiliary spacer element P6c, which is located between the sixth main auxiliary spacer element P6b and the seventh lens E7. The contact method of other spacer elements is similar to that in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1; it will not be repeated here.

[0127] In summary, the structural parameters of the optical lens in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 9.

[0128] In Embodiment 3, the first lens has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fifth lens has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 6 below, OBJ is the object plane, STO is the aperture stop, the aperture stop is located on the first lens, S15 and S16 are the object side and image side of the filter or protective glass, respectively, and S17 is the imaging plane.

[0129] Table 6 shows the basic structural parameters of the optical lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0130]

[0131] Table 6

[0132] Table 7 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspherical.

[0133] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.8196E-05 1.4647E-03 -1.0757E-03 4.8095E-04 -1.3264E-04 2.2730E-05 -2.3138E-06 1.2307E-07 -2.5557E-09 S2 -1.1551E-02 5.4917E-03 -1.2230E-03 1.4065E-04 -8.9834E-06 3.3522E-07 -7.2981E-09 8.6067E-11 -4.2543E-13 S3 1.7241E-03 -1.0164E-02 8.9724E-03 -4.4902E-03 1.4537E-03 -3.0937E-04 4.1773E-05 -3.2074E-06 1.0593E-07 S4 8.1942E-03 -6.6060E-03 1.7088E-03 9.5979E-04 -1.0614E-03 4.2974E-04 -9.0981E-05 9.9892E-06 -4.4074E-07 S5 3.8751E-03 -3.8277E-03 2.2449E-03 -2.2949E-03 1.3433E-03 -4.7207E-04 9.7892E-05 -1.0728E-05 4.7394E-07 S6 2.5817E-03 -6.5809E-03 3.4699E-03 -2.0548E-03 7.6107E-04 -2.0427E-04 4.2633E-05 -5.5058E-06 2.9729E-07 S7 -1.3354E-02 1.6497E-03 -5.3748E-03 4.7336E-03 -2.4130E-03 7.1176E-04 -1.1639E-04 9.4954E-06 -2.8216E-07 S8 -8.0422E-03 6.3229E-04 -9.7683E-04 3.4460E-04 -3.6965E-05 -1.1572E-05 4.4664E-06 -5.8592E-07 2.8479E-08 S9 7.3095E-03 3.1236E-03 -3.2833E-03 1.3703E-03 -3.5205E-04 5.7448E-05 -5.7950E-06 3.2674E-07 -7.7916E-09 S10 2.5960E-02 -2.1602E-02 8.0364E-03 -2.0203E-03 3.5870E-04 -4.3476E-05 3.3543E-06 -1.4621E-07 2.7143E-09 S11 5.7678E-02 -2.5964E-02 7.9710E-03 -1.8780E-03 2.9368E-04 -2.8747E-05 1.6624E-06 -5.0667E-08 6.0387E-10 S12 1.4004E-02 3.9464E-03 -2.8329E-03 5.8543E-04 -6.5201E-05 4.2679E-06 -1.6215E-07 3.2813E-09 -2.7185E-11 S13 -6.2062E-02 1.1226E-02 -1.3096E-03 1.0120E-04 -4.9691E-06 1.5094E-07 -2.7237E-09 2.6642E-11 -1.0856E-13 S14 -3.4937E-02 7.2338E-03 -1.0388E-03 9.3118E-05 -5.0972E-06 1.6893E-07 -3.2896E-09 3.4513E-11 -1.5025E-13

[0134] Table 7

[0135] Figure 17 The on-axis chromatic aberration curve of the optical lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 18 The astigmatism curve of the optical lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curve of the optical lens in Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0136] according to Figures 17 to 19 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

[0137] In summary, the optical lenses of Examples 1 to 3 respectively satisfy the relationships shown in Table 8.

[0138]

[0139]

[0140] Table 8

[0141] Table 9 shows some parameters (unit: mm) of the optical lenses of Examples 1 to 3.

[0142] Parameters / Examples 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d2s 4.795 4.795 4.795 4.396 4.394 4.394 4.955 4.473 4.955 d3s 4.940 4.940 4.940 4.533 4.530 4.530 4.508 4.491 4.508 D3s 7.600 7.600 7.600 5.549 5.546 5.546 7.300 7.283 7.300 d4s 5.507 5.507 5.540 5.452 5.448 5.448 5.298 5.282 5.298 d4m 5.463 5.463 5.535 5.408 5.404 5.404 5.254 5.141 5.254 D4s 8.387 8.387 8.387 8.850 8.846 8.846 9.500 9.484 9.500 d5s 6.510 6.510 6.748 6.828 6.822 6.822 6.712 6.698 6.712 d5m 6.510 6.510 6.704 6.779 6.778 6.778 6.646 6.632 6.646 d0s 7.230 7.230 7.230 6.465 6.465 6.465 5.276 5.258 5.276 EP23 0.403 0.403 0.403 0.339 0.716 0.743 0.324 0.324 0.324 CP3 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 EP34 0.556 0.556 0.579 0.889 0.339 0.339 0.914 0.914 0.914 EP45 0.631 0.631 0.578 0.956 0.889 0.889 1.008 1.008 1.008 |SAG51| 0.726 0.726 0.702 0.381 0.500 0.500 0.948 0.948 0.948 f 6.650 6.650 6.650 6.650 6.650 6.650 6.859 6.859 6.859 f1 11.777 11.777 11.777 9.616 9.616 9.616 9.524 9.524 9.524 f2 80.795 80.795 80.795 -36.561 -36.561 -36.561 -38.556 -38.556 -38.556 f3 -208.445 -208.445 -208.445 24.422 24.422 24.422 37.904 37.904 37.904 f4 41.347 41.347 41.347 -22.868 -22.868 -22.868 -90.193 -90.193 -90.193 f5 -31.697 -31.697 -31.697 6.610 6.610 6.610 5.043 5.043 5.043 f6 7.711 7.711 7.711 -11.118 -11.118 -11.118 -7.669 -7.669 -7.669 f7 -7.711 -7.711 -7.711 -48.880 -48.880 -48.880 -12.398 -12.398 -12.398 f45 -163.419 -163.419 -163.419 8.657 8.657 8.657 5.318 5.318 5.318 FOV 86.521 86.521 86.521 85.409 85.409 85.409 86.117 86.117 86.117

[0143] Table 9

[0144] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0145] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0146] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0147] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0148] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that, It includes a lens barrel and a lens assembly and a spacer assembly disposed within the lens barrel. The lens group consists of seven lenses arranged sequentially along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has positive optical power; the seventh lens has negative optical power; the object side of the third lens is convex; the object side of the fourth lens is convex, and the image side of the fourth lens is concave; the object side of the fifth lens is concave, and the image side of the fifth lens is convex; the object side of the sixth lens is convex, and the image side of the sixth lens is concave. The spacer group includes at least a fourth spacer element, which is located between the fourth lens and the fifth lens and contacts the image-side portion of the fourth lens; The maximum effective radius DT41 of the object-side surface of the fourth lens and the maximum effective radius DT51 of the object-side surface of the fifth lens satisfy the following relationship: 1.17 <DT51 / DT41<1.33; The combined focal length f45 of the fourth lens and the fifth 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 satisfy the following condition: -0.04 < (D4s - d4s) / f45 < 0.81; The inner diameter d4m of the image-side surface of the fourth spacer element and the maximum effective radius DT51 of the object-side surface of the fifth lens satisfy the following relationship: 1.73 <d4m / DT51<1.92。 2. The optical lens according to claim 1, characterized in that, The inner diameter d4m of the image-side surface of the fourth spacer element and the spacing distance |SAG51| from the intersection of the object-side surface of the fifth lens and the optical axis to the object-side surface of the non-effective diameter region of the fifth lens along the optical axis satisfy the following: 5.40 <d4m / |SAG51|≤14.20。 3. The optical lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the inner diameter d4s of the object-side surface of the fourth spacer element satisfy the following condition: -0.26 <d4s / f4<0.15。 4. The optical lens according to claim 1, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel, the maximum effective radius DT71 of the object-side surface of the seventh lens, and the maximum effective radius DT11 of the object-side surface of the first lens satisfy the following relationship: 2.45 <d0s / (DT71-DT11)<3.40。 5. The optical lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, the center thickness CT5 of the fifth lens, and the air gap T45 between the fourth and fifth lenses along the optical axis satisfy: 0.36 <EP45 / (T45+CT5)<0.60。 6. The optical lens according to claim 1, characterized in that, The spacer group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0 ≤ EP45 / f45 < 0.

21.

7. The optical lens according to claim 1, characterized in that, The spacer group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and the spacing distance |SAG51| between the object-side surface of the fifth lens and the intersection of the optical axis and the object-side surface of the fifth lens and the object-side surface of the non-effective diameter region of the fifth lens along the optical axis satisfy the following: 0.38 < |SAG51| / EP45 < 1.

24.

8. The optical lens according to claim 1, characterized in that, The spacer group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The maximum effective radius DT41 of the object-side surface of the fourth lens, the maximum effective radius DT42 of the image-side surface of the fourth lens, and the spacing distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis satisfy the following: 5.28 < (DT41 + DT42) / EP34 < 14.

6.

9. The optical lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The outer diameter D3s of the object-side surface of the third spacer element and the outer diameter D4s of the object-side surface of the fourth spacer element satisfy the following condition: 1.08 <D4s / D3s<1.62。 10. The optical lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer element along the optical axis satisfy: 4.82 <T34 / CP3<6.84。 11. The optical lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The inner diameter d3s of the object-side surface of the third spacer element, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy the following relationship: -0.2 <d3s / (R5+R6)<0.2。 12. The optical lens according to any one of claims 1 to 11, characterized in that, The spacer element group further includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The spacing distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis and the center thickness CT3 of the third lens satisfy: 0.

56. <EP23 / CT3<1.3。 13. The optical lens according to any one of claims 1 to 11, characterized in that, The spacer element group further includes a second spacer element, which is located between the second lens and the third lens and contacts the image-side surface of the second lens. The inner diameter d2s of the object-side surface of the second spacer element and the maximum effective radius DT31 of the object-side surface of the third lens satisfy the following condition: 2.00 <d2s / DT31<2.25。 14. The optical lens according to any one of claims 1 to 11, characterized in that, The spacer element group further includes a second spacer element and a fifth spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface of the second lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The inner diameter d5s of the object-side surface of the fifth spacer element, the inner diameter d2s of the object-side surface of the second spacer element, the effective focal length f5 of the fifth lens, and the effective focal length f2 of the second lens satisfy the following condition: -0.04 < (d5s - d2s) / (f5 - f2) < 0.10.

Images