Optical lens

Abstract

The present invention provides an optical lens. The optical lens includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The effective focal length f of the optical lens and the maximum field 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 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 spacer distance EP67 between the sixth spacer element and the seventh spacer element in the optical axis direction, and the spacer distance SAG71 in the optical axis direction 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. The present invention solves the problem of serious stray light in the rear group of the optical lens with large image plane characteristics in the prior art.

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 become increasingly 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] To meet the requirements of large image planes, the number of lenses is usually increased to improve 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 also gradually increases. In particular, the clear aperture of the rear lens group of the optical lens is relatively large, which is likely to form 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 characteristics 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 characteristics 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 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 is partially in 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 partially in contact with the image side surface of the seventh lens. The effective focal length f of the optical lens and the maximum field 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 radius of curvature 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, 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 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 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 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 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 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 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.

[0008] 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 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 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 at least includes 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 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] Further, the air interval 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 EP67 between the sixth and seventh spacer elements along the optical axis, and the inner diameter d6s of the object side of the sixth spacer element, satisfy the following condition: 8.35 <d6s / EP67<15.15。

[0011] Furthermore, the distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the distance SAG62 between the object side surface of the sixth lens and the optical structure area of ​​the sixth lens along the optical axis, and the distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the distance SAG62 between the image side surface of the sixth lens and the optical structure area of ​​the sixth lens along the optical axis, satisfy the following condition: 1.40 < |SAG61| / |SAG62| < 3.35.

[0012] Furthermore, the inner diameter d0m of the image-side end face of the lens tube and the inner diameter d7m of the image-side surface of the seventh spacer element satisfy the following relationship: 1.05 <d0m / d7m<1.15。

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

[0014] Furthermore, the distance L between the object-side end face and the image-side end face 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 the following condition: 5.20 <L / (CT6+CT7)<7.10。

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

[0016] Furthermore, 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 the following relationship: 2.40 <D6m / DT71<2.75。

[0017] 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 EP56 between the fifth and sixth spacers along the optical axis, the spacing distance EP67 between the sixth and seventh spacers 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 the following: 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 surface portion of the fifth lens. The inner diameter d5s and the outer diameter D5s of the object-side surface of the fifth spacer element satisfy: 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 surface portion of the fifth lens. 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 satisfy: 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 surface portion of the fourth lens. 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 satisfy: 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 surface portion of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and contacts the image-side surface portion of the seventh lens. The effective focal length f of the optical lens and the maximum field 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 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.

[0022] The present application provides a seven - element optical lens with a large image plane, satisfying 5.90mm < f×tan(FOV / 2) < 6.30mm and 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 deflecting ability of the object side of the seventh lens on light is strong. As a result, light is prone to be deflected at a large angle to the spacer elements on both sides of the lens to form reflected stray light, leading to 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 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. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not unduly limit the present invention. In the drawings:

[0024] Figure 1 The dimension marking diagram of the optical lens of an optional embodiment of the present invention is shown;

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

[0026] Figure 3 The schematic structural diagram of the optical lens of Embodiment 1 - 2 of the present invention is shown;

[0027] Figure 4 The schematic structural diagram of the optical lens of Embodiment 1 - 3 of the present invention is shown;

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

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

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

[0031] Figure 10 The schematic structural diagram of the optical lens of Embodiment 2 - 3 of the present invention is shown;

[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 This diagram shows the illuminance grayscale of an optical lens according to an alternative embodiment of the present invention at half field of view.

[0038] Figure 21 The image shows a grayscale diagram of the illuminance of an optical lens according to an alternative embodiment of the present invention at the full field of view;

[0039] Figure 22 The image shows a grayscale diagram of the illumination of an optical lens at half field of view in one example.

[0040] Figure 23 The image shows a grayscale diagram of the illumination of an example optical lens at the full field of view.

[0041] Figure 24 Another example of an optical lens is shown in grayscale at half field of view;

[0042] Figure 25 Another example of an optical lens is shown in grayscale at full field of view. 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 paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0049] To address the problem of severe stray light in the rear array of existing optical lenses with large image plane characteristics, this invention provides an optical lens.

[0050] like 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 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 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 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 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 deflecting ability of the object side surface of the seventh lens on light rays is strong, which makes it easier for light rays to be deflected at large angles 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 confines EP67 / |SAG71| within a reasonable range, which can confine the optical path of light rays, avoid the distance between the sixth spacer element and the seventh spacer element being too small, which may cause some light rays 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, which may cause some light rays 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 an illumination grayscale image when f × tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.49, and the light rays are at the half-field angle. For example, the half-field angle is 42.5°. Figure 21The illuminance gray scale map is shown where f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.49, and 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 illuminance is uniform and there is no fine stray light. Figure 22 The illuminance gray scale map is shown where f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.35, and the light is at the half field of view angle. Figure 23 The illuminance gray scale map is shown where f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 0.35, and the light is at the full field of view angle. From Figure 22 and Figure 23 it can be seen that arc-shaped stray light is visible on the illuminance gray scale map. Figure 24 The illuminance gray scale map is shown where f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 1.26, and the light is at the half field of view angle. Figure 25 The illuminance gray scale map is shown where f×tan(FOV / 2) = 5.94, D6m / R13 = 4.9, EP67 / |SAG71| = 1.26, and the light is at the full field of view angle. From Figure 22 and Figure 23 it can be seen that arc-shaped stray light is visible on the illuminance gray scale map. At the same time, by horizontally comparing Figure 20 , Figure 22 and Figure 24 it can be seen that Figure 22 and Figure 24 show fine arc-shaped stray light on the right side, and the brightness is extremely high. By horizontally comparing Figure 21 , Figure 23 and Figure 25 it can be seen that Figure 23 and Figure 25 show strip-shaped arc-shaped stray light 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 stray light improvement. When the conditional expression EP67 / |SAG71| ≤ 0.4, the spacing 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 expression EP67 / |SAG71| > 0.85, the spacing 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 stray light problem 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. The optical system satisfies: when 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 optional 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 increasing the light flux. For another example, in some optional 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 optional embodiments, the third lens has a positive optical power, which can appropriately converge the light rays and is beneficial for the light rays to smoothly transition to the rear optical system. For another example, in some optional 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 optional 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 to further meet the requirements of a large image plane. For another example, in some optional 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 profile of each lens can be simulated according to the built-in surface profile of the used software and / or the used tool and adjusted appropriately.

[0057] In some optional 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 thereby improve the imaging quality of the optical lens.

[0058] In some optional 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 optional 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 improving the stability of the assembly of the sixth lens group.

[0060] In some optional embodiments, 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 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, ensuring the clarity of the imaging of the optical lens.

[0061] In some optional embodiments, the 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. By constraining f7 / EP67 within a reasonable range, the degree of deflection of the light by the seventh lens is controlled, reducing the light deflected to the seventh spacer element and reducing the generation of stray light. At the same time, it is beneficial to focus all the light incident on the seventh lens onto 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 optional embodiments, the distance L along the optical axis between the object side end surface and the image side end surface 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 improving 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 optional 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 convergence 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 optional 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-gathering 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 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 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 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 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 may affect the imaging quality of the optical lens.

[0067] In some optional embodiments, 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 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 optional embodiments, 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 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, ensuring the light transmission amount, which is beneficial to improving 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 better focus in the rear-end 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 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 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, and 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 effective focal length f of the optical lens and the maximum field 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 spacing distance EP67 of 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 - lens 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 deflecting ability of the object - side surface of the seventh lens to light is stronger. 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 such stray light, by constraining f7 / EP67 within a reasonable range, the optical path of light propagating through the seventh lens and the degree of deflection of the seventh lens to light 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 and a lens group and a spacer element group disposed within 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: 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 seventh spacer element, which is located on the image side of the seventh lens and partially contacts the image - side surface of the seventh lens; between the effective focal length f of the optical lens and the maximum field - of - view angle FOV of the optical lens, it satisfies: 5.90mm < f×tan(FOV / 2) < 6.30mm; between 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, it satisfies: 2.4 < d0m / DT72 < 2.8; between 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, it satisfies: 10.30 < d7m / R14*N7 < 12.05.

[0073] This embodiment provides a seven - lens 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 light 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 constrained within a reasonable range to ensure the deflection angle of the light rays after passing through the seventh lens, reduce the light rays deflected outside the imaging plane, reduce the loss of light energy, 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 expressions in the above - mentioned embodiment 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] The optical lens in this application can adopt multiple lenses, such as the seven 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 solution 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 - lens case is described in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also 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 the 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 describing specific embodiments 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 embodiment.

[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; 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.

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

[0082] Example 1

[0083] 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.

[0084] 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.

[0085] like Figure 2The 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.

[0086] like Figure 3 The diagram shown is a structural schematic of the optical lens of Embodiment 1-2. The bearing and contact methods of each spacer element are similar to those of Embodiment 1-1. Please refer to the relevant description in Embodiment 1-1, which will not be repeated here.

[0087] like Figure 4 The diagram shown is a structural schematic of the optical lens of Embodiment 1-3. The bearing and contact method of each spacer element is similar to that of Embodiment 1-1. Please refer to the relevant description in Embodiment 1-1. It will not be repeated 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 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 concave. 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 convex, and its image-side surface S10 is concave. 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, 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, and S17 is the imaging plane.

[0090] 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).

[0091]

[0092]

[0093] Table 2

[0094] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0095]

[0096] 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.

[0097] Face 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 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.

[0100] according to Figures 5 to 7 As can be seen, the optical lens given in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] 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.

[0103] like Figures 8 to 10 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.

[0104] 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 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.

[0105] like Figure 9 The diagram shown is a structural schematic of the optical lens of Embodiment 2-2. The bearing and contact method of each spacer element is similar to that of Embodiment 2-1. Please refer to the relevant description in Embodiment 2-1. It will not be repeated here.

[0106] like Figure 10 The diagram shown is a structural schematic of the optical lens of Embodiment 2-3. The bearing and contact method of each spacer element is similar to that of Embodiment 2-1. Please refer to the relevant description in Embodiment 2-1. It will not be repeated here.

[0107] 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.

[0108] 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 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 4, 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, and S17 is the imaging plane.

[0109] 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).

[0110]

[0111] Table 4

[0112] 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.

[0113]

[0114]

[0115] Table 5

[0116] 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.

[0117] according to Figures 11 to 13 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0118] Example 3

[0119] 14 to Figure 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.

[0120] 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 seventh lens E7, and a seventh spacer element P7.

[0121] like Figure 14 The 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 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.

[0122] like Figure 15 The diagram shown is a structural schematic of the optical lens of Embodiment 3-2. The bearing and contact method of each spacer element is similar to that of Embodiment 3-1. Please refer to the relevant description in Embodiment 3-1. It will not be repeated here.

[0123] like Figure 16 The diagram shown is a structural schematic of the optical lens of Embodiment 3-3. The bearing and contact method of each spacer element is similar to that of Embodiment 3-1. Please refer to the relevant description in Embodiment 3-1. It will not be repeated here.

[0124] 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.

[0125] 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, 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, and S17 is the imaging plane.

[0126] 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).

[0127]

[0128] Table 6

[0129] 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.

[0130]

[0131]

[0132] Table 7

[0133] 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.

[0134] according to Figures 17 to 19 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

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

[0136] Conditional expression / Embodiment 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f x 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 Examples 1 to 3.

[0139]

[0140]

[0141] Table 9

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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, The lens barrel comprises a lens barrel body, a lens group and a spacer element group arranged in the lens barrel body, The lens group is composed of seven lenses, the lens group is 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 object side surface of the sixth lens is convex, the image side surface of the sixth lens is concave, the seventh lens has negative refractive 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 comprises 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 partially contacts the image side surface of the sixth lens, and the seventh spacer element is located on the image side of the seventh lens and partially contacts the image side surface of the seventh lens; The effective focal length f of the optical lens and the maximum field 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 radius of curvature R13 of the object side surface of the seventh lens satisfy: 4.85<D6m / R13<5.25; The interval distance EP67 of the sixth spacer element and the seventh spacer element along the optical axis direction, the interval distance SAG71 of the object side surface of the seventh lens to 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.

2. The optical lens of claim 1, wherein, The air interval T67 of 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.

3. The optical lens of claim 1, wherein, The interval distance EP67 of 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.

4. The optical lens of claim 1, wherein, The interval distance SAG61 of the object side surface of the sixth lens to the object side surface of the optical structure region of the sixth lens along the optical axis direction, and the interval distance SAG62 of the image side surface of the sixth lens to the image side surface of the optical structure region of the sixth lens along the optical axis direction satisfy: 1.40<|SAG61| / |SAG62|<3.

35.

5. The optical lens of claim 1, wherein, 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 spacer element satisfy: 1.05<d0m / d7m<1.

15.

6. The optical lens of claim 1, wherein, The interval distance EP67 of 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.

7. The optical lens of claim 1, wherein, A distance L of an object side end surface of the lens barrel and an image side end surface of the lens barrel in the optical axis direction, a central thickness CT6 of the sixth lens on the optical axis, and a central thickness CT7 of the seventh lens on the optical axis satisfy 5.20 < L / (CT6 + CT7) < 7.

10.

8. The optical lens of claim 1, wherein, A combined focal length f56 of the fifth lens and the sixth lens, a radius of curvature R10 of an image side surface of the fifth lens, and a radius of curvature R11 of an object side surface of the sixth lens satisfy -0.70 < f56 / (R10 + R11) < 0.

95.

9. The optical lens of claim 1, wherein, An outer diameter D6m of an image side surface of the sixth spacer element and a maximum effective radius DT71 of an object side surface of the seventh lens satisfy 2.40 < D6m / DT71 < 2.

75.

10. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and partially in contact with an image side surface of the fifth lens, and a separation distance EP56 of the fifth spacer element and the sixth spacer element in the optical axis direction, a separation distance EP67 of the sixth spacer element and the seventh spacer element in the optical axis direction, a central thickness CT6 of the sixth lens on the optical axis, and a central thickness CT7 of the seventh lens on the optical axis satisfy 1.05 < (EP56 + EP67) / (CT6 + CT7) < 1.

85.

11. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and partially in contact with an image side surface of the fifth lens, and an inner diameter d5s of an object side surface of the fifth spacer element and an outer diameter D5s of the object side surface of the fifth spacer element satisfy 1.45 < D5s / d5s < 1.

80.

12. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and partially in contact with an image side surface of the fifth lens, and an inner diameter d5s of an object side surface of the fifth spacer element and a maximum effective radius DT61 of an object side surface of the sixth lens satisfy 1.75 < d5s / DT61 < 1.

95.

13. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and partially in contact with an image side surface of the fourth lens, and an inner diameter d4m of an image side surface of the fourth spacer element, a maximum effective radius DT51 of an object side surface of the fifth lens, and a maximum effective radius DT71 of an object side surface of the seventh lens satisfy 2.75 < d4m / (DT71 - DT51) < 3.45.

Images