Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are arranged in the lens barrel; the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens meet the following conditions: 5.90 mmlt; f * tan (FOV / 2) lt; the thickness is 6.30 mm; the outer diameter D6m of the image side surface of the sixth spacing element and the curvature radius R13 of the object side surface of the seventh lens meet the following condition: 4.85 lt; d6m / R13lt; 5.25, 5.25; the spacing distance EP67 between the sixth spacing element and the seventh spacing element in the optical axis direction and the spacing distance SAG71 between the intersection point of the object side face of the seventh lens and the optical axis and the object side face of the optical structure area of the seventh lens in the optical axis direction meet the formula: 0.40 lt; eP67 / SAG71 is less than or equal to 0.85. According to the invention, the problem of serious stray light of a rear end group of an optical lens with a large image plane characteristic in the prior art is solved.

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, the functions of electronic devices have gradually become diversified. As a result, the demand for optical lenses is continuously increasing, and at the same time, the imaging requirements for optical lenses are gradually improving. With the progress of optical technology, the imaging quality of optical lenses has been significantly improved, but it still cannot meet the requirements of large image planes.

[0003] In order to meet the requirements of large image planes, the number of lenses is usually increased to improve the imaging quality and expand the image plane. However, with the increase in the number of lenses, the risk of stray light in the optical lens is also gradually rising. In particular, the clear aperture of the rear lens group of the optical lens is relatively large, which easily forms reflected stray light at the rear end of the optical lens, affecting the imaging quality.

[0004] That is to say, in the prior art, the optical lens with the characteristic of a large image plane has a serious problem of stray light in the rear lens group. Summary of the Invention

[0005] The main object of the present invention is to provide an optical lens to solve the problem of serious stray light in the rear lens group of the optical lens with the characteristic of a large image plane in the prior art.

[0006] 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 is composed of seven lenses, and the seven lenses are sequentially arranged along the optical axis direction from the object side to the image side, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group includes at least a sixth spacer element and a seventh spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and is in partial contact with the image side surface of the seventh lens. The effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy: 5.90mm < f × tan(FOV / 2) < 6.30mm; the outer diameter D6m of the image side surface of the sixth spacer element and the curvature radius R13 of the object side surface of the seventh lens satisfy: 4.85 < D6m / R13 < 5.25; the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction and the spacing distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the object side surface of the optical structure region of the seventh lens along the optical axis direction satisfy: 0.40 < EP67 / |SAG71| ≤ 0.85.

[0007] According to another aspect of the present invention, there is provided an optical lens, which includes a lens barrel, a lens group and a spacer element group disposed 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 seventh lens has a negative optical power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the spacer element group includes at least a sixth spacer element and a seventh spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and is in partial contact with the image side surface of the seventh lens; the effective focal length f of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 5.90mm < f×tan(FOV / 2) < 6.30mm; the outer diameter D6m of the image side surface of the sixth spacer element and the curvature radius R13 of the object side surface of the seventh lens satisfy: 4.85 < D6m / R13 < 5.25; the axial spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction and the effective focal length f7 of the seventh lens satisfy: -36.00 < f7 / EP67 < -11.25.

[0008] According to another aspect of the present invention, there is provided an optical lens, which includes a lens barrel, a lens group and a spacer element group disposed 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 seventh lens has a negative optical power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the spacer element group includes at least a seventh spacer element. The seventh spacer element is located on the image side of the seventh lens and is in partial contact with the image side surface of the seventh lens; the effective focal length f of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 5.90mm < f×tan(FOV / 2) < 6.30mm; the inner diameter d0m of the image side end surface of the lens barrel and the effective radius DT72 of the image side surface of the seventh lens satisfy: 2.4 < d0m / DT72 < 2.8; the inner diameter d7m of the image side surface of the seventh spacer element, the curvature radius R14 of the image side surface of the seventh lens, and the refractive index N7 of the seventh lens satisfy: 10.30 < d7m / R14*N7 < 12.05.

[0009] Furthermore, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the maximum thickness CP6 of the sixth spacer element along the optical axis direction satisfy: 36.55 ≤ T67 / CP6 < 49.10.

[0010] Furthermore, the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis, and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: 8.35 < d6s / EP67 < 15.15.

[0011] Furthermore, the spacing distance SAG61 along the optical axis from the intersection of the object side surface of the sixth lens and the optical axis to the object side surface of the optical structure region of the sixth lens, and the spacing distance SAG62 along the optical axis from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the optical structure region of the sixth lens satisfy: 1.40 < |SAG61| / |SAG62| < 3.35.

[0012] Furthermore, the inner diameter d0m of the image side end face of the lens barrel and the inner diameter d7m of the image side surface of the seventh spacer element satisfy: 1.05 < d0m / d7m < 1.15.

[0013] Furthermore, the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis, and the effective focal length f7 of the seventh lens satisfy: -36.00 < f7 / EP67 < -11.25.

[0014] Furthermore, the distance L along the optical axis between the object side end face and the image side end face of the lens barrel, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 5.20 < L / (CT6 + CT7) < 7.10.

[0015] Furthermore, the combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R10 of the image side surface of the fifth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.70 < f56 / (R10 + R11) < 0.95.

[0016] Furthermore, the outer diameter D6m of the image side surface of the sixth spacer element and the maximum effective radius DT71 of the object side surface of the seventh lens satisfy: 2.40 < D6m / DT71 < 2.75.

[0017] Furthermore, the spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and is in partial contact with the image side surface of the fifth lens. The spacing distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis, the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 1.05 < (EP56 + EP67) / (CT6 + CT7) < 1.85.

[0018] Furthermore, 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 portion of the fifth lens. The following condition is satisfied between the inner diameter d5s of the object-side surface of the fifth spacer element and the outer diameter D5s of the object-side surface of the fifth spacer element: 1.45 < D5s / d5s < 1.80.

[0019] Furthermore, 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 portion of the fifth lens. The following condition is satisfied between the inner diameter d5s of the object-side surface of the fifth spacer element and the maximum effective radius DT61 of the object-side surface of the sixth lens: 1.75 < d5s / DT61 < 1.95.

[0020] Furthermore, the spacer element group further includes 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 following condition is satisfied among the inner diameter d4m of the image-side surface of the fourth spacer element, the maximum effective radius DT51 of the object-side surface of the fifth lens, and the maximum effective radius DT71 of the object-side surface of the seventh lens: 2.75 < d4m / (DT71 - DT51) < 3.45.

[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 as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens. The spacer element group at least includes a sixth spacer element and a seventh spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and contacts the image-side portion of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and contacts the image-side portion of the seventh lens. The following conditions are satisfied between the effective focal length f of the optical lens and the maximum field of view FOV of the optical lens: 5.90 mm < f×tan(FOV / 2) < 6.30 mm. The following condition is satisfied between the outer diameter D6m of the image-side surface of the sixth spacer element and the curvature radius R13 of the object-side surface of the seventh lens: 4.85 < D6m / R13 < 5.25. The following condition is satisfied between the axial spacing distance EP67 between the sixth spacer element and the seventh spacer element and the axial spacing distance SAG71 from the intersection point of the object-side surface of the seventh lens and the optical axis to the object-side surface of the optical structure region of the seventh lens: 0.40 < EP67 / |SAG71| ≤ 0.85.

[0022] The present application provides a seven-piece optical lens with a large image plane and satisfying 5.90mm < f×tan(FOV / 2) < 6.30mm, 4.85 < D6m / R13 < 5.25. Since the outer diameter of the image side of the sixth spacer element is larger than the curvature radius of the object side of the seventh lens, the light deflection ability of the object side of the seventh lens is strong, which makes the light prone to large-angle deflection to the spacer elements on both sides of the lens to form reflected stray light, resulting in serious stray light in the optical lens. To reduce the generation of such stray light, the present application confines EP67 / |SAG71| within a reasonable range, which can confine the optical path of the light, avoid the distance between the sixth spacer element and the seventh spacer element being too small, causing some light to be deflected to the sixth spacer element for reflection, and also avoid the distance between the sixth spacer element and the seventh spacer element being too large, causing some light to be deflected to the seventh spacer element for reflection, effectively reducing the risk of generating stray light at the position of the seventh lens and improving the imaging quality of the optical lens. 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 of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0025] Figure 2 It shows the schematic structural diagram of the optical lens of Embodiment 1-1 of the present invention;

[0026] Figure 3 It shows the schematic structural diagram of the optical lens of Embodiment 1-2 of the present invention;

[0027] Figure 4 It shows the schematic structural diagram of the optical lens of Embodiment 1-3 of the present invention;

[0028] Figures 5 to 7 It respectively shows the axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of Embodiment 1 of the present invention;

[0029] Figure 8 It shows the schematic structural diagram of the optical lens of Embodiment 2-1 of the present invention;

[0030] Figure 9 It shows the schematic structural diagram of the optical lens of Embodiment 2-2 of the present invention;

[0031] Figure 10 It shows the schematic structural diagram of the optical lens of Embodiment 2-3 of the present invention;

[0032] Figures 11 to 13 Show the axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of Embodiment 2 of the present invention respectively;

[0033] Figure 14 Show the schematic structural diagram of the optical lens of Embodiment 3-1 of the present invention;

[0034] Figure 15 Show the schematic structural diagram of the optical lens of Embodiment 3-2 of the present invention;

[0035] Figure 16 Show the schematic structural diagram of the optical lens of Embodiment 3-3 of the present invention;

[0036] Figures 17 to 19 Show the axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of Embodiment 3 of the present invention respectively;

[0037] Figure 20 Show the illumination gray-scale diagram of the optical lens of an alternative embodiment of the present invention when the light is at the semi-field angle;

[0038] Figure 21 Show the illumination gray-scale diagram of the optical lens of an alternative embodiment of the present invention when the light is at the full-field angle;

[0039] Figure 22 Show the illumination gray-scale diagram of the optical lens in an example when the light is at the semi-field angle;

[0040] Figure 23 Show the illumination gray-scale diagram of the optical lens in an example when the light is at the full-field angle;

[0041] Figure 24 Show the illumination gray-scale diagram of the optical lens in another example when the light is at the semi-field angle;

[0042] Figure 25 Show the illumination gray-scale diagram of the optical lens in another example when the light is at the full-field angle. Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the orientation terms such as "upper", "lower", "top", and "bottom" generally refer to the directions shown in the drawings or to the directions of the components themselves in the vertical, perpendicular, or gravitational directions. Similarly, for the sake of easy understanding and description, "inner" and "outer" refer to the inner and outer sides relative to the contours of the respective components. However, the above orientation terms are not used to limit the present invention.

[0046] It should be noted that in this specification, the expressions such as "first", "second", "third", etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, for the sake of easy explanation, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The 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 positive and negative of the R value (R refers to the radius of curvature of the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side as an example, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; taking the image side as an example, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex. In the present 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 in the rear group of an optical lens with large image plane characteristics in the prior art, the present invention provides an optical lens.

[0050] Such as Figures 1 to 19As shown, the optical lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group is composed 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 object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group includes at least a sixth spacer element and a seventh spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and is in partial contact with the image side surface of the seventh lens. The effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy: 5.90 mm < f × tan(FOV / 2) < 6.30 mm. The outer diameter D6m of the image side surface of the sixth spacer element and the curvature radius R13 of the object side surface of the seventh lens satisfy: 4.85 < D6m / R13 < 5.25. The axial spacing distance EP67 between the sixth spacer element and the seventh spacer element, and the axial spacing distance SAG71 from the intersection of the object side surface of the seventh lens and the optical axis to the object side surface of the optical structure region of the seventh lens satisfy: 0.40 < EP67 / |SAG71| ≤ 0.85.

[0051] This application provides a seven-piece optical lens with a large image plane that satisfies 5.90 mm < f × tan(FOV / 2) < 6.30 mm and 4.85 < D6m / R13 < 5.25. Since the outer diameter of the image side surface of the sixth spacer element is relatively large compared to the curvature radius of the object side surface of the seventh lens, the light deflection ability of the object side surface of the seventh lens is relatively strong, which makes it easy for light to be deflected at a large angle to the spacer elements on both sides of the lens to form reflected stray light, resulting in serious stray light in the optical lens. To reduce the generation of such stray light, this application constrains EP67 / |SAG71| within a reasonable range, which can constrain the optical path of light, avoid the distance between the sixth spacer element and the seventh spacer element being too small, causing some light to be deflected to the sixth spacer element for reflection, and also avoid the distance between the sixth spacer element and the seventh spacer element being too large, causing some light to be deflected to the seventh spacer element for reflection, effectively reducing the risk of generating stray light at the position of the seventh lens and improving the imaging quality of the optical lens.

[0052] In addition, referring to Table 1 below and Figures 20 to 25 as shown, Figure 20 shows the illumination gray-scale diagram when f × tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.49, and the light is at the half field of view angle. For example, the half field of view angle is 42.5°. Figure 21Shows an illumination gray-scale diagram that satisfies f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.49 and the illumination when the light is at the full field of view angle. For example, the full field of view angle is 85°. From Figure 20 and Figure 21 it can be seen that the illumination is uniform and there is no fine stray light. Figure 22 Shows an illumination gray-scale diagram that satisfies f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.35 and the illumination when the light is at the half field of view angle. Figure 23 Shows an illumination gray-scale diagram that satisfies f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.35 and the illumination when the light is at the full field of view angle. From Figure 22 and Figure 23 it can be seen that there is arc-shaped stray light visible on the illumination gray-scale diagram. Figure 24 Shows an illumination gray-scale diagram that satisfies f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 1.26 and the illumination when the light is at the half field of view angle. Figure 25 Shows an illumination gray-scale diagram that satisfies f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 1.26 and the illumination when the light is at the full field of view angle. From Figure 22 and Figure 23 it can be seen that there is arc-shaped stray light visible on the illumination gray-scale diagram. At the same time, by making a horizontal comparison of Figure 20 , Figure 22 and Figure 24 it can be seen that Figure 22 and Figure 24 there is fine arc-shaped stray light visible on the right side, and the brightness is extremely high. By making a horizontal comparison of Figure 21 , Figure 23 and Figure 25 it can be seen that Figure 23 and Figure 25 there is strip-shaped arc-shaped stray light visible at the upper right corner. Thus, it can be seen that when the optical lens satisfies 0.40 < EP67 / |SAG71| ≤ 0.85, the reflected stray light formed at the sixth spacer element and the seventh spacer element can be reduced, achieving the purpose of improving the stray light. When the conditional formula EP67 / |SAG71| ≤ 0.4, the spacer distance between the sixth spacer element and the seventh spacer element in the optical axis direction is relatively small. At a specific angle, the imaging light will be reflected on the sixth spacer element, causing arc-shaped stray light in the optical system and affecting the imaging quality. When the conditional formula EP67 / |SAG71| > 0.85, the spacer distance between the sixth spacer element and the seventh spacer element in the optical axis direction is relatively large. At a specific angle, the imaging light is emitted on the seventh spacer element, causing arc-shaped stray light in the optical system and reducing the imaging quality of the light system.

[0053]

[0054] Table 1

[0055] It should be noted that in this application, EP67 / |SAG71| is restricted within a reasonable range, the distance between the sixth spacer element and the seventh spacer element is constrained, and the transmission path of light at the seventh lens is controlled to solve the problem of stray light when f×tan(FOV / 2) is in the range of 5.90 mm to 6.30 mm and D6m / R13 is in the range of 4.85 to 5.25. When EP67 / |SAG71| is in the range of 0.40 to 0.85, the purpose of improving stray light can be achieved, which does not depend on the optical power of the lens and the surface shape of the lens. The optical power and surface shape of the lens are further optimizations of the optical imaging lens on this basis. The optical powers of the other lenses can be positive or negative according to the design requirements of the actual optical system, and the surface shapes of the other lenses can be convex or concave according to the design requirements of the optical system. When the optical system satisfies 5.90 mm < f×tan(FOV / 2) < 6.30 mm, 4.85 < D6m / R13 < 5.25, and 0.40 < EP67 / |SAG71| ≤ 0.85, the optical lens can reduce the influence of stray light while meeting the requirements of a large image plane.

[0056] For example, in some alternative embodiments, 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 conducive to improving the light flux. For another example, in some alternative embodiments, the second lens has a negative optical power, which can balance the aberration brought by the front positive lens and appropriately diverge the light rays to ensure the image plane. For another example, in some alternative embodiments, the third lens has a positive optical power, which can appropriately converge the light rays, facilitating the smooth transition of the light rays to the subsequent optical system. For another example, in some alternative embodiments, the fourth lens has a negative optical power, which can balance the aberration brought by the front positive lens and improve the imaging quality. For another example, in some alternative embodiments, the fifth lens has a positive optical power, which is beneficial for appropriately converging the light rays. For another example, in some embodiments, 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 plane, further meeting the requirements of a large image plane. For another 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 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 stray light simulation of the lens through software and / or tools such as LIGHTOOS and ASAP. The optical lens in this application uses LIGHTOOS for simulation. During the simulation using software and / or tools such as the above, the surface profiles of each lens can be simulated according to the built-in surface profiles of the software and / or tools used and adjusted appropriately.

[0057] In some alternative embodiments, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the maximum thickness CP6 of the sixth spacer element along the optical axis direction satisfy: 36.55 ≤ T67 / CP6 < 49.10. By constraining T67 / CP6 within a reasonable range, the spacing distance between the optical structure regions of the sixth lens and the seventh lens and the spacing distance at the center can be constrained to control the path difference between the marginal rays and the central rays, optimize the focusing of the off-axis rays, achieve the purpose of reducing spherical aberration and astigmatism, and thus improve the imaging quality of the optical lens.

[0058] In some alternative embodiments, the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: 8.35 < d6s / EP67 < 15.15. By constraining d6s / EP67 within a reasonable range, it is beneficial to control the marginal rays, enabling more light rays to pass through the seventh lens and participate in imaging, while meeting the requirements of a large image plane and improving the overall imaging quality of the lens.

[0059] In some alternative embodiments, the distance SAG61 along the optical axis from the intersection of the object side surface of the sixth lens and the optical axis to the object side surface of the optical structure region of the sixth lens, and the distance SAG62 along the optical axis from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the optical structure region of the sixth lens satisfy: 1.40 < |SAG61| / |SAG62| < 3.35. By constraining |SAG61| / |SAG62| within a reasonable range, the structural form of the sixth lens can be controlled, ensuring the processing feasibility of the sixth lens while improving the structural strength and stiffness of the sixth lens, which is beneficial to enhancing the stability of the sixth lens assembly.

[0060] In some alternative embodiments, the inner diameter d0m of the image side end face of the lens barrel and the inner diameter d7m of the image side surface of the seventh spacer element satisfy: 1.05 < d0m / d7m < 1.15. By constraining d0m / d7m within a reasonable range, it is beneficial for the beam propagation path to be smoother, and at the same time, the propagation height of the beam is controlled within a reasonable range to ensure the clarity of the optical lens imaging.

[0061] In some alternative embodiments, the distance EP67 along the optical axis between the sixth spacer element and the seventh spacer element, and the effective focal length f7 of the seventh lens satisfy: -36.00 < f7 / EP67 < -11.25. By constraining f7 / EP67 within a reasonable range, the degree of deflection of the seventh lens to the light is controlled, reducing the light deflected to the seventh spacer element and the generation of stray light. At the same time, it is beneficial to focus all the incident light to the imaging surface, which is beneficial to improving the focusing ability of the optical lens and ensuring the stability of the field curvature of the optical lens.

[0062] In some alternative embodiments, the distance L along the optical axis between the object side end face and the image side end face of the lens barrel, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 5.20 < L / (CT6 + CT7) < 7.10. By constraining L / (CT6 + CT7) within a reasonable range, the central thicknesses of the sixth lens and the seventh lens are ensured, which is beneficial to enhancing the structural strength and stiffness of the sixth lens and the seventh lens, reducing the beam offset caused by mechanical stress or vibration, and enhancing the stability of the optical lens.

[0063] In some alternative embodiments, the combined focal length f56 of the fifth lens and the sixth lens, the radius of curvature R10 of the image side of the fifth lens, and the radius of curvature R11 of the object side of the sixth lens satisfy: -0.70 < f56 / (R10 + R11) < 0.95. By constraining f56 / (R10 + R11) within a reasonable range, the deflection degree of light rays by the fifth lens and the sixth lens is controlled, and further the rationality of the position of the focusing point of the light rays after passing through the fifth lens and the sixth lens is controlled, which is beneficial to reducing aberrations such as field curvature, distortion, and spherical aberration of the optical lens and improving the imaging quality of the optical lens.

[0064] In some alternative embodiments, the outer diameter D6m of the image side of the sixth spacer element and the maximum effective radius DT71 of the object side of the seventh lens satisfy: 2.40 < D6m / DT71 < 2.75. By constraining D6m / DT71 within a reasonable range, it is beneficial to control the degree of light ray occlusion by the sixth spacer element, and then the light condensing ability of the seventh lens can be improved, thereby effectively suppressing stray light and ghost images of the optical lens and improving the imaging quality of the optical lens.

[0065] In some alternative 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 in partial contact with the image side of the fifth lens. The axial spacing distance EP56 between the fifth spacer element and the sixth spacer element, the axial spacing distance EP67 between the sixth spacer element and the seventh spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 1.05 < (EP56 + EP67) / (CT6 + CT7) < 1.85. By constraining (EP56 + EP67) / (CT6 + CT7) within a reasonable range, the ratio of the edge thickness to the central thickness of the sixth lens and the seventh lens can be indirectly constrained, making the thickness ratio of the sixth lens and the seventh lens more uniform, ensuring the structural strength of the sixth lens and the seventh lens, and avoiding the breakage of the sixth lens and the seventh lens during the assembly process.

[0066] In some alternative 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 in partial contact with the image side of the fifth lens. The inner diameter d5s of the object side of the fifth spacer element and the outer diameter D5s of the object side of the fifth spacer element satisfy: 1.45 < D5s / d5s < 1.80. By constraining D5s / d5s within a reasonable range, the size of the fifth spacer element is ensured, which is beneficial to achieving the purpose of improving the strength and stiffness of the fifth spacer element and avoiding deformation and warping of the fifth spacer element during the assembly process of the optical lens, which affects the imaging quality of the optical lens.

[0067] In some alternative embodiments, the spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side portion of the fifth lens. The inner diameter d5s of the object side of the fifth spacer element and the maximum effective radius DT61 of the object side of the sixth lens satisfy: 1.75 < d5s / DT61 < 1.95. By constraining d5s / DT61 within a reasonable range, it is beneficial to control the aperture of the light incident on the sixth lens, and then control the range of the light incident on the sixth lens, effectively reducing the risk of stray light generated by the fifth spacer element.

[0068] In some alternative embodiments, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side portion of the fourth lens. The inner diameter d4m of the image side of the fourth spacer element, the maximum effective radius DT51 of the object side of the fifth lens, and the maximum effective radius DT71 of the object side of the seventh lens satisfy: 2.75 < d4m / (DT71 - DT51) < 3.45. By constraining d4m / (DT71 - DT51) within a reasonable range, the range of the incident light can be controlled, the light transmission amount can be ensured, and it is beneficial to improve the relative illuminance of the optical lens. By constraining the difference between the maximum effective radii of the object sides of the seventh lens and the fifth lens, the light can be effectively controlled to be better focused in the rear group, thereby improving the field curvature of the optical lens and the imaging quality of the optical lens.

[0069] 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 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 includes at least a sixth spacer element and a seventh spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and in contact with the image-side portion of the sixth lens, and the seventh spacer element is located on the image side of the seventh lens and in contact with the image-side portion of the seventh lens; the effective focal length f of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 5.90 mm < f × tan(FOV / 2) < 6.30 mm; the outer diameter D6m of the image side of the sixth spacer element and the curvature radius R13 of the object side of the seventh lens satisfy: 4.85 < D6m / R13 < 5.25; the interval distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction and the effective focal length f7 of the seventh lens satisfy: -36.00 < f7 / EP67 < -11.25.

[0070] This embodiment provides a seven - element optical lens with a large image plane and satisfying 5.90mm < f×tan(FOV / 2) < 6.30mm, 4.85 < D6m / R13 < 5.25. Since the outer diameter of the image - side surface of the sixth spacer element is larger than the curvature radius of the object - side surface of the seventh lens, the light - deflecting ability of the object - side surface of the seventh lens is relatively strong. As a result, light is prone to large - angle deflection to the spacer elements on both sides of the lens, forming reflected stray light, which causes serious stray light in the optical lens. To reduce the generation of this stray light, by constraining f7 / EP67 within a reasonable range, the optical path of light propagating through the seventh lens and the degree of light deflection by the seventh lens can be constrained, avoiding the distance between the sixth spacer element and the seventh spacer element being too small, which may cause some light to deflect to the sixth spacer element and be reflected, and also avoiding the distance between the sixth spacer element and the seventh spacer element being too large, which may cause some light to deflect to the seventh spacer element and be reflected. This effectively reduces the risk of generating stray light at the position of the seventh lens and improves the imaging quality of the optical lens.

[0071] Of course, other parametric forms in the above - mentioned embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0072] According to another aspect of the present invention, an optical lens is provided, including a lens barrel, a lens group, and a spacer - element group disposed within the lens barrel. The lens group is composed of seven lenses, and the lenses of the lens group are sequentially arranged along the optical - axis direction from the object side to the image side as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens. The spacer - element group includes at least a seventh spacer element, which is located on the image side of the seventh lens and is in partial contact with the image - side surface of the seventh lens. The effective focal length f of the optical lens and the maximum field - of - view angle FOV of the optical lens satisfy: 5.90mm < f×tan(FOV / 2) < 6.30mm. The inner diameter d0m of the image - side end face of the lens barrel and the effective radius DT72 of the image - side surface of the seventh lens satisfy: 2.4 < d0m / DT72 < 2.8. The inner diameter d7m of the image - side surface of the seventh spacer element, the curvature radius R14 of the image - side surface of the seventh lens, and the refractive index N7 of the seventh lens satisfy: 10.30 < d7m / R14*N7 < 12.05.

[0073] This embodiment provides a seven - element optical lens with a large image plane and satisfying 5.90mm < f×tan(FOV / 2) < 6.30mm, 2.4 < d0m / DT72 < 2.8. Since the inner diameter of the image - side end face of the lens barrel is relatively large compared to the effective radius of the image - side surface of the seventh lens, it is easy to cause some marginal rays not to reach the imaging plane, resulting in a relatively low relative illumination of the optical lens and affecting the imaging quality. In this application, d7m / R14*N7 is restricted within a reasonable range to ensure the deflection angle of the rays after passing through the seventh lens, reduce the rays deflected outside the imaging plane, reduce the light - energy loss, ensure the light intensity reaching the imaging plane, and is beneficial to improving the relative illumination of the optical lens.

[0074] Of course, other parametric forms in the above - mentioned embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0075] Optionally, the above - mentioned optical lens may further include a protective glass for protecting the photosensitive element located on the imaging plane.

[0076] In the optical lens of this application, multiple lenses can be used, such as the seven - element lenses mentioned above. In this application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature - radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0077] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although the seven - element lens is described as an example in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may further include other numbers of lenses.

[0078] Figure 1 A schematic diagram of the dimension marking of an optical lens of this application is shown. Figure 1 Parameters such as d5s, D5s, d6s, D6m, d7m, d0m, EP56, EP67, CP6, L, SAG61, SAG62, SAG71 are marked in it to clearly and intuitively understand the meaning of these parameters. For the convenience of describing the surface shape of the optical lens and specific lenses, these parameters will no longer be shown in the drawings when specific embodiments are described later.

[0079] The following further describes, with reference to the drawings, examples of the specific surface shapes and parameters of the optical lens applicable to the above - mentioned embodiments.

[0080] 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; in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 2-3. For the optical lens, parameters such as the curvature radius and central thickness of the first lens to the seventh lens, the spacing distance between the lenses, and the high-order term coefficients are the same under the three examples in the same embodiment. However, parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, the second spacer element, and the third spacer element, as well as the shapes of some lenses are different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0081] It should be noted that any of the examples in the following Embodiments 1 to 3 is applicable to this application.

[0082] Embodiment 1

[0083] As Figures 2 to 7 shown, the optical lens of Embodiment 1 is described. Figure 2 The schematic structural diagram of the optical lens of Embodiment 1-1 is shown, Figure 3 The schematic structural diagram of the optical lens of Embodiment 1-2 is shown, Figure 4 The schematic structural diagram of the optical lens of Embodiment 1-3 is shown.

[0084] As Figures 2 to 4 shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes 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, which are arranged in sequence from the object side to the image side.

[0085] As Figure 2As shown, it is a schematic structural diagram of the optical lens of Embodiment 1-1. In this example, the object side S1 of the first lens is in contact with the barrel part. The object side and the image side of the first spacer element are respectively in partial contact with the image side S2 of the first lens and the object side S3 of the second lens. The object side and the image side of the second spacer element are respectively in partial contact with the image side S4 of the second lens and the object side S5 of the third lens. The object side and the image side of the third spacer element are respectively in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens. The object side and the image side of the fourth spacer element are respectively in partial contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens. The object side and the image side of the fifth spacer element are respectively in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens. The object side and the image side of the sixth spacer element are respectively in partial contact with the image side S12 of the sixth lens and the object side S13 of the seventh lens. The object side of the seventh spacer element is in partial contact with the image side S14 of the seventh lens.

[0086] As Figure 3 shown, it is a schematic structural diagram of the optical lens of Embodiment 1-2. The bearing and abutting manners of each spacer element are similar to those of Embodiment 1-1. For relevant descriptions, reference can be made to Embodiment 1-1, and details will not be elaborated here.

[0087] As Figure 4 shown, it is a schematic structural diagram of the optical lens of Embodiment 1-3. The bearing and abutting manners of each spacer element are similar to those of Embodiment 1-1. For relevant descriptions, reference can be made to Embodiment 1-1, and details will not be elaborated here.

[0088] 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.

[0089] In Embodiment 1, the first lens has a positive optical power. The object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens has a negative optical power. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens has a positive optical power. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens has a negative optical power. The object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is concave. The fifth lens has a positive optical power. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is concave. The sixth lens has a positive optical power. The object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens has a negative optical power. The object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. OBJ in Table 2 is the object surface, STO is the aperture stop, the aperture stop is located on the first lens, S15 and S16 are the object side and the image side of the filter or protective glass, and S17 is the imaging surface.

[0090] Table 2 shows the basic structural parameter table of the optical lens in the first embodiment, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0091]

[0092]

[0093] Table 2

[0094] In the first embodiment, the object side and the image side of the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface profiles of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0095]

[0096] where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, 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 correction coefficient of the i-th order of the aspherical surface. Table 3 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each aspherical mirror surface S1 - S14 in the first embodiment.

[0097] Plane number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.6531E-03 5.3237E-03 -4.6039E-03 2.3803E-03 -7.6798E-04 1.5556E-04 -1.9195E-05 1.3161E-06 -3.8438E-08 S2 2.4386E-02 -2.3242E-02 1.4336E-02 -6.3324E-03 1.9364E-03 -3.9413E-04 5.0484E-05 -3.6528E-06 1.1298E-07 S3 2.6671E-02 -2.5283E-02 1.5478E-02 -7.0332E-03 2.2550E-03 -4.8101E-04 6.4233E-05 -4.8119E-06 1.5297E-07 S4 1.1659E-02 -9.4144E-03 5.8634E-03 -3.1323E-03 1.2151E-03 -3.0823E-04 4.8339E-05 -4.2366E-06 1.5912E-07 S5 1.2453E-02 -1.3635E-03 -7.0544E-03 6.1624E-03 -2.8086E-03 7.5335E-04 -1.1849E-04 1.0097E-05 -3.5914E-07 S6 -1.3373E-03 -2.6830E-04 -1.8526E-03 1.3347E-03 -6.8014E-04 2.1882E-04 -4.0395E-05 3.9009E-06 -1.5323E-07 S7 -1.2150E-02 1.1865E-02 -1.6575E-02 1.1551E-02 -4.8959E-03 1.2841E-03 -2.0092E-04 1.7086E-05 -6.0614E-07 S8 -1.2855E-02 1.7901E-02 -1.8493E-02 1.0685E-02 -3.8759E-03 8.7783E-04 -1.1865E-04 8.6931E-06 -2.6458E-07 S9 -2.6261E-02 3.1417E-02 -2.6565E-02 1.4190E-02 -4.8105E-03 1.0103E-03 -1.2640E-04 8.6125E-06 -2.4591E-07 S10 -3.0160E-02 8.5730E-03 -4.4355E-03 1.9737E-03 -5.3735E-04 8.3943E-05 -7.1928E-06 3.0688E-07 -4.8965E-09 S11 2.2605E-02 -6.0763E-03 -4.3177E-05 2.4950E-04 -6.5838E-05 9.5443E-06 -8.5878E-07 4.4856E-08 -1.0140E-09 S12 2.0188E-02 5.3577E-04 -2.5789E-03 7.4067E-04 -1.0997E-04 9.5742E-06 -4.8647E-07 1.3322E-08 -1.5191E-10 S13 -3.9940E-02 4.6216E-03 -4.4583E-04 1.7429E-05 2.4418E-06 -3.3363E-07 1.6332E-08 -3.6735E-10 3.1805E-12 S14 -2.1622E-02 2.2468E-03 -3.2142E-05 -3.2293E-05 4.7766E-06 -3.2240E-07 1.1629E-08 -2.1667E-10 1.6392E-12

[0098] Table 3

[0099] Figure 5 Shows the axial chromatic aberration curve of the optical lens in the first embodiment, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical lens. Figure 6 Shows the astigmatism curve of the optical lens in the first embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 Shows the distortion curve of the optical lens in the first embodiment, which represents the distortion magnitude values corresponding to different field angles.

[0100] According to Figures 5 to 7 it can be seen that the optical lens given in the first embodiment can achieve good imaging quality.

[0101] The second embodiment

[0102] As Figures 8 to 13 shown, the optical lens in the second embodiment is described. Figure 8 Shows the structural schematic diagram of the optical lens in Embodiment 2 - 1 Figure 9 Shows the structural schematic diagram of the optical lens in Embodiment 2 - 2 Figure 10 Shows the structural schematic diagram of the optical lens in Embodiment 2 - 3

[0103] As Figures 8 to 10 shown, the optical lens includes a lens barrel, seven lenses and a plurality of spacer elements. The lens barrel includes 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, which are arranged in sequence from the object side to the image side.

[0104] As Figure 8 shown, it is a schematic structural diagram of the optical lens of Embodiment 2-1. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element are in partial 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 the image side surface of the second spacer element are in partial 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 the image side surface of the third spacer element are in partial 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 the image side surface of the fourth spacer element are in partial 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 the image side surface of the fifth spacer element are in partial 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 the image side surface of the sixth spacer element are in partial 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 partial contact with the image side surface S14 of the seventh lens.

[0105] As Figure 9 shown, it is a schematic structural diagram of the optical lens of Embodiment 2-2. The bearing and abutting manners of the respective spacer elements are similar to those in Embodiment 2-1, and reference can be made to the relevant descriptions in Embodiment 2-1, which will not be elaborated here.

[0106] As Figure 10 shown, it is a schematic structural diagram of the optical lens of Embodiment 2-3. The bearing and abutting manners of the respective spacer elements are similar to those in Embodiment 2-1, and reference can be made to the relevant descriptions in Embodiment 2-1, which will not be elaborated here.

[0107] In summary, the structural parameters of the optical lens in Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are as shown in Table 9.

[0108] In the second embodiment, the first lens has a positive optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens has a negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens has a positive optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens has a negative optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens has a positive optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens has a positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens has a negative optical power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. OBJ in Table 4 is the object surface, STO is the aperture stop, the aperture stop is located on the first lens, S15 and S16 are the object side surface and the image side surface of the filter or the protective glass, and S17 is the imaging surface.

[0109] Table 4 shows the basic structural parameter table of the optical lens in the second embodiment, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0110]

[0111] Table 4

[0112] Table 5 shows the high-order term coefficients applicable to each aspherical mirror surface in the second embodiment, where each aspherical surface type can be defined by the formula (1) given in the first embodiment above. In this embodiment, the object side surface and the image side surface of the first lens to the seventh lens are all aspherical surfaces.

[0113]

[0114]

[0115] Table 5

[0116] Figure 11 shows the axial chromatic aberration curve of the optical lens in the second embodiment, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical lens. Figure 12 shows the astigmatism curve of the optical lens in the second embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 shows the distortion curve of the optical lens in the second embodiment, which represents the distortion magnitude values corresponding to different field angles.

[0117] According to Figures 11 to 13 it can be known that the optical lens given in the second embodiment can achieve good imaging quality.

[0118] The third embodiment

[0119] 14 to Figure 19 As shown, the optical lens of Embodiment 3 is described. Figure 14 The schematic structural diagram of the optical lens of Embodiment 3-1 is shown. Figure 15 The schematic structural diagram of the optical lens of Embodiment 3-2 is shown. Figure 16 The schematic structural diagram of the optical lens of Embodiment 3-3 is shown.

[0120] As Figures 14 to 16 shown, the optical lens includes a lens barrel, seven lenses and a plurality of spacer elements. The lens barrel includes 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, which are arranged in sequence from the object side to the image side.

[0121] As Figure 14 shown, it is the schematic structural diagram of the optical lens of Embodiment 3-1. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element are in partial 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 the image side surface of the second spacer element are in partial 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 the image side surface of the third spacer element are in partial 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 the image side surface of the fourth spacer element are in partial 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 the image side surface of the fifth spacer element are in partial 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 the image side surface of the sixth spacer element are in partial 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 partial contact with the image side surface S14 of the seventh lens.

[0122] As Figure 15 shown, it is the schematic structural diagram of the optical lens of Embodiment 3-2. The abutting and contacting manners of each spacer element are similar to those of Embodiment 3-1, and reference can be made to the relevant descriptions in Embodiment 3-1, which will not be elaborated here.

[0123] As Figure 16 shown, it is the schematic structural diagram of the optical lens of Embodiment 3-3. The abutting and contacting manners of each spacer element are similar to those of Embodiment 3-1, and reference can be made to the relevant descriptions in Embodiment 3-1, which will not be elaborated here.

[0124] In summary, the structural parameters of the optical lens of Embodiment 3 under Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3 are shown in Table 9.

[0125] In Embodiment 3, the first lens has a positive optical power. The object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens has a negative optical power. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens has a positive optical power. The object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The fourth lens has a negative optical power. The object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is concave. The fifth lens has a positive optical power. The object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex. The sixth lens has a negative optical power. The object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens has a negative optical power. The object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. OBJ in Table 6 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, and S17 is the imaging plane.

[0126] Table 6 shows the basic structural parameter table of the optical lens of Embodiment 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0127]

[0128] Table 6

[0129] Table 7 shows the high-order term coefficients applicable to each aspherical mirror surface in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above. In this embodiment, the object sides and image sides of the first lens to the seventh lens are all aspherical surfaces.

[0130]

[0131]

[0132] Table 7

[0133] Figure 17 shows the axial chromatic aberration curve of the optical lens of Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical lens. Figure 18 shows the astigmatism curve of the optical lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 19 shows the distortion curve of the optical lens of Embodiment 3, which represents the distortion magnitude values corresponding to different field angles.

[0134] According to Figures 17 to 19 it can be known that the optical lens given in Embodiment 3 can achieve good imaging quality.

[0135] In summary, the optical lenses of Embodiment 1 to Embodiment 3 respectively satisfy the relationships shown in Table 8.

[0136] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f × tan(HFOV) 5.94 5.94 5.94 6.14 6.14 6.14 6.26 6.26 6.26 D6m / R13 4.90 5.05 4.98 5.15 5.23 5.15 4.89 5.07 4.95 EP67 / |SAG71| 0.49 0.57 0.41 0.80 0.72 0.85 0.68 0.65 0.73 (EP56 + EP67) / (CT6 + CT7) 1.17 1.17 1.08 1.79 1.82 1.82 1.44 1.44 1.57 T67 / CP6 36.55 36.55 36.55 49.08 49.08 49.08 42.19 42.19 42.19 d6s / EP67 13.34 11.63 15.12 8.37 9.40 8.58 9.24 9.09 9.46 |SAG61| / |SAG62| 1.60 1.42 1.46 2.72 3.20 3.34 1.72 1.64 2.31 D5s / d5s 1.72 1.73 1.79 1.64 1.71 1.62 1.49 1.59 1.56 d0m / d7m 1.14 1.11 1.12 1.11 1.11 1.11 1.10 1.08 1.10 f7 / EP67 -31.18 -27.10 -35.97 -11.29 -12.61 -11.29 -15.88 -15.88 -15.88 d4m / (DT71 - DT51) 3.42 3.42 3.43 3.05 2.98 3.11 2.81 2.79 2.85 L / (CT6 + CT7) 5.34 5.22 5.34 7.07 7.07 7.07 6.34 6.24 6.34 f56 / (R10 + R11) 0.30 0.30 0.30 -0.68 -0.68 -0.68 0.93 0.93 0.93 d5s / DT61 1.81 1.87 1.78 1.88 1.84 1.91 1.94 1.89 1.88 D6m / DT71 2.62 2.71 2.67 2.70 2.74 2.70 2.44 2.53 2.47

[0137] Table 8

[0138] Table 9 shows some parameters (unit: mm) of the optical lenses of Embodiment 1 to Embodiment 3.

[0139]

[0140]

[0141] Table 9

[0142] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0143] Obviously, the above-described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0144] It should be noted that the terms used herein are only for describing specific embodiments, rather than intending to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0145] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0146] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: The invention comprises 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 comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis direction, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a concave surface, the seventh lens has negative optical power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; The spacer element group includes at least a sixth spacer element and a seventh spacer element, the sixth spacer element is located between the sixth lens and the seventh lens and is in contact with the image side surface of the sixth lens, and the seventh spacer element is located on the image side of the seventh lens and is in contact with the image side surface of the seventh lens; The effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy the following conditions: 5.90 mm <f×tan(FOV / 2)<6.30mm; The outer diameter D6m of the image side surface of the sixth spacer element and the curvature radius R13 of the object side surface of the seventh lens satisfy: 4.85 <D6m / R13<5.25; The spacing distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis direction and the spacing distance SAG71 from the intersection of the object side surface of the seventh lens and the optical axis to the object side surface of the optical structure area of ​​the seventh lens along the optical axis direction satisfy: 0.40 <EP67 / |SAG71|≤0.85。 2. The optical lens according to claim 1, characterized in that: An air interval T67 between the sixth lens and the seventh lens on the optical axis and a maximum thickness CP6 of the sixth spacing element along the optical axis satisfy the following ratio: 36.55≤T67 / CP6<49.

10.

3. The optical lens according to claim 1, characterized in that: The spacing distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis direction and the inner diameter d6s of the object side surface of the sixth spacing element satisfy: 8.35 <d6s / EP67<15.15。 4. The optical lens according to claim 1, characterized in that: A spacing distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the object side surface of the optical structure area of ​​the sixth lens along the optical axis direction, and a spacing distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the optical structure area of ​​the sixth lens along the optical axis direction satisfy the following: 1.40<|SAG61| / |SAG62|<3.

35.

5. The optical lens according to claim 1, characterized in that: The inner diameter d0m of the image side end surface of the lens barrel and the inner diameter d7m of the image side surface of the seventh spacing element satisfy: 1.05 <d0m / d7m<1.15。 6. The optical lens according to claim 1, characterized in that: The spacing distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis direction and the effective focal length f7 of the seventh lens satisfy: -36.00 <f7 / EP67<-11.25。 7. The optical lens according to claim 1, characterized in that: The distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel along the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 5.20 <L / (CT6+CT7)<7.10。 8. The optical lens according to claim 1, characterized in that: The combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R10 of the image side surface of the fifth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.70 <f56 / (R10+R11)<0.95。 9. The optical lens according to claim 1, characterized in that: The outer diameter D6m of the image side surface of the sixth spacer element and the maximum effective radius DT71 of the object side surface of the seventh lens satisfy: 2.40 <D6m / DT71<2.75。 10. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element 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, and a spacing distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis, a spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy the following conditions: 1.05<(EP56+EP67) / (CT6+CT7)<1.85.

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