Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, a lens set and a spacer component accommodated in the lens barrel; the lens set comprises, in sequence from an object side to an image side along an optical axis direction: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, a seventh lens with positive refractive power and an eighth lens with refractive power; the optical lens satisfies: 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45; and 2.00 < (D5s-d5s) / EP45 < 5.85.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an optical lens. Background Technology

[0002] Eight-element optical lenses, due to their superior aberration correction capabilities, high image resolution, and excellent detail reproduction, have gradually become standard equipment in high-end professional imaging equipment. However, on the other hand, because of the large number of lenses, the image quality of these lenses is highly dependent on the spacing between adjacent lenses, especially the spacing between lenses located at the center of the lens. Taking the fifth lens as an example, there is a significant difference in the air gaps before and after the fifth lens, and the air gap between the fourth and fifth lenses is particularly sensitive, affecting the propagation path of light between the lenses. Non-imaging light rays are prone to multiple reflections on the lens surface, eventually entering the imaging plane and forming stray light. Summary of the Invention

[0003] This application provides an optical lens that can effectively suppress the reflection of non-imaging light rays on the lens surface at its center position, reduce the amount of stray light entering the imaging surface, and thus improve the imaging quality of the optical lens.

[0004] This application provides an optical lens, including a lens barrel and a lens group and a spacer assembly housed within the lens barrel;

[0005] The lens group comprises, arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, having a convex object side and a concave image side; a second lens with positive optical power, having a convex object side and a concave image side; a third lens with negative optical power, having a convex object side and a concave image side; a fourth lens with negative optical power, having a convex object side and a concave image side; a fifth lens with positive optical power, having a convex object side and a concave image side; a sixth lens with negative optical power, having a concave object side and a concave image side; a seventh lens with positive optical power, having a convex object side and a convex image side; and an eighth lens with optical power, having a concave object side and a convex image side.

[0006] The spacing assembly includes a fourth spacing element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fifth spacing element located between the fifth lens and the sixth lens and in contact with the image side of the fifth lens;

[0007] The optical lens satisfies: 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45; and 2.00 < (D5s - d5s) / EP45 < 5.85; where T45 is the air gap between the fourth and fifth lenses on the optical axis, T56 is the air gap between the fifth and sixth lenses on the optical axis, f5 is the effective focal length of the fifth lens, f is the effective focal length of the optical lens, D5s is the outer diameter of the object-side surface of the fifth spacer element, d5s is the inner diameter of the object-side surface of the fifth spacer element, and EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis.

[0008] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.45 < D6m / (CT6+T67) < 6.90; where D6m is the outer diameter of the image-side surface of the sixth spacer element, CT6 is the center thickness of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0009] In some embodiments of this application, the spacer assembly includes a first spacer element located between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens; the optical lens satisfies: 8.65 < R3 / EP12 < 11.80; where R3 is the radius of curvature of the object-side surface of the second lens, and EP12 is the distance along the optical axis between the image-side surface of the first spacer element and the object-side surface of the second spacer element.

[0010] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens, and an eighth spacing element located on the image side of the eighth lens and in contact with the image side of the eighth lens; the optical lens satisfies: 2.00 < EP78 / CT8 < 2.50; where EP78 is the distance along the optical axis between the image side of the seventh spacing element and the object side of the eighth spacing element, and CT8 is the center thickness of the eighth lens.

[0011] In some embodiments of this application, the spacing assembly includes a sixth spacing element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: -4.00 < f6 / (d5m+d6s) ≤ -2.55; where f6 is the effective focal length of the sixth lens, d5m is the inner diameter of the image-side surface of the fifth spacing element, and d6s is the inner diameter of the object-side surface of the sixth spacing element.

[0012] In some embodiments of this application, the spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 4.85 < TD / T78 < 5.45 and -3.85 < d7m / R15 < -2.15; where TD is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, d7m is the inner diameter of the image-side surface of the seventh spacer element, and R15 is the radius of curvature of the object-side surface of the eighth lens.

[0013] In some embodiments of this application, the spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image side of the second lens; the optical lens satisfies: 3.20≤f12 / (D2s-d2s)≤4.65; where f12 is the combined focal length of the first lens and the second lens, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

[0014] In some embodiments of this application, the optical lens satisfies: 8.05 < d4s / T45 < 8.80; where d4s is the inner diameter of the object side of the fourth spacer element, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0015] In some embodiments of this application, the spacer assembly is located between the first lens and the second lens and is in contact with the image side of the first lens; the optical lens satisfies: 6.30 < f1 / d1s < 7.30; where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side of the first spacer element.

[0016] In some embodiments of this application, the spacing assembly includes an eighth spacing element located on the image side of the eighth lens and in contact with the image side surface of the eighth lens; the optical lens satisfies: -0.90 < (R15 + R16) / d8s < -0.30; where R15 is the radius of curvature of the object side surface of the eighth lens, R16 is the radius of curvature of the image side surface of the eighth lens, and d8s is the inner diameter of the object side surface of the eighth spacing element.

[0017] In some embodiments of this application, the spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens; the optical lens satisfies: 5.45 < D3s / (EP23+CT3) < 6.20; where D3s is the outer diameter of the object-side surface of the third spacer element, EP23 is the distance along the optical axis between the image-side surface of the second spacer element and the object-side surface of the third spacer element, and CT3 is the center thickness of the third lens.

[0018] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 5.05≤d7s / CT7<6.80; where d7s is the inner diameter of the object side of the seventh spacing element and CT7 is the center thickness of the seventh lens.

[0019] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.35 < R12 / R13 ≤ 7.20 and 1.65 < CP6 / T67 < 2.55; wherein, R12 is the radius of curvature of the image-side surface of the sixth lens, R13 is the radius of curvature of the object-side surface of the seventh lens, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0020] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 3.55 < (EP45 + EP56) / T56 < 6.35; where EP45 is the distance along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, EP56 is the distance along the optical axis between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0021] In some embodiments of this application, the optical lens satisfies: -7.15≤D4s×V4 / f4<-5.20; where D4s is the outer diameter of the object side of the fourth spacer element, V4 is the Abbe number of the fourth lens, and f4 is the effective focal length of the fourth lens.

[0022] The optical lens of this application consists of a lens barrel, eight lenses, and at least two spacer elements, satisfying 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45. This is beneficial for controlling the field curvature of each field of view within a reasonable range and balancing the spherical aberration and field curvature of the optical system. However, there is a large difference in the air gaps before and after the fifth lens, and the air gap between the fourth and fifth lenses is relatively sensitive, which affects the propagation path of light between the lenses. Non-imaging light rays are prone to multiple reflections on the lens surface, eventually entering the imaging plane and forming stray light. Based on this, this application, by constraining the relationship between the inner and outer diameter difference (D5s-d5s) of the object side of the fifth spacer element and the distance EP45 along the optical axis between the image side of the fourth spacer element and the object side of the fifth spacer element, rationally designs the thickness of the fifth spacer element and the edge of the fifth lens. This can effectively intercept the light reflected from the fifth lens, while reducing the phenomenon of light entering the fifth lens after being reflected at the surface of the sixth lens and undergoing multiple total internal reflections, effectively improving the stray light problem and enhancing the imaging quality of the optical lens. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structural parameters of an optical lens according to one embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application;

[0025] Figure 3 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application;

[0026] Figure 4 This is a schematic diagram of the structure of an optical lens according to Embodiment 3 of this application;

[0027] Figure 5A A schematic diagram of the magnification chromatic aberration curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2, and Embodiment 3 of this application is shown.

[0028] Figure 5B A schematic diagram of the on-axis chromatic aberration curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0029] Figure 5C A schematic diagram of the astigmatism curves of the optical lenses according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0030] Figure 6 This is a schematic diagram of the structure of an optical lens according to Embodiment 4 of this application;

[0031] Figure 7This is a schematic diagram of the structure of an optical lens according to Embodiment 5 of this application;

[0032] Figure 8 This is a schematic diagram of the structure of an optical lens according to Embodiment Six of this application;

[0033] Figure 9A A schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 4, 5, and 6 according to this application is shown.

[0034] Figure 9B A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 4, 5, and 6 according to this application is shown.

[0035] Figure 9C A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0036] Figure 10 This is a schematic diagram of the structure of an optical lens according to Embodiment Seven of this application;

[0037] Figure 11 This is a schematic diagram of the structure of an optical lens according to Embodiment 8 of this application;

[0038] Figure 12 This is a schematic diagram of the structure of an optical lens according to Embodiment Nine of this application;

[0039] Figure 13A A schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0040] Figure 13B A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0041] Figure 13C A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0042] Figure 14A and Figure 14B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=5.43;

[0043] Figure 15A and Figure 15BThe spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=5.58;

[0044] Figure 16A and Figure 16B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=1.25;

[0045] Figure 17A and Figure 17B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=7.76. Detailed Implementation

[0046] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] 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.

[0048] 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 strictly to scale.

[0049] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location 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 by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, when the R value is positive, it is considered convex, and when the R value is negative, it is considered concave; for the image-side surface, when the R value is positive, it is considered concave, and when the R value is negative, it is considered convex.

[0050] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] like Figure 1 As shown, one embodiment of this application proposes an optical lens, which includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel.

[0054] The lens group comprises, arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, having a convex object side and a concave image side; a second lens with positive optical power, having a convex object side and a concave image side; a third lens with negative optical power, having a convex object side and a concave image side; a fourth lens with negative optical power, having a convex object side and a concave image side; a fifth lens with positive optical power, having a convex object side and a concave image side; a sixth lens with negative optical power, having a concave object side and a concave image side; a seventh lens with positive optical power, having a convex object side and a convex image side; and an eighth lens with optical power, having a concave object side and a convex image side.

[0055] The spacing assembly includes a fourth spacing element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fifth spacing element located between the fifth lens and the sixth lens and in contact with the image side of the fifth lens.

[0056] The optical lens satisfies the following conditions: 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45; and 2.00 < (D5s - d5s) / EP45 < 5.85;

[0057] Wherein, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, f5 is the effective focal length of the fifth lens, f is the effective focal length of the optical lens, D5s is the outer diameter of the object side of the fifth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis.

[0058] In the above embodiments of this application, the optical lens consists of a lens barrel, eight lenses, and at least two spacer elements, satisfying 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45, which is beneficial for controlling the field curvature of each field of view within a reasonable range and balancing the spherical aberration and field curvature of the optical system. However, there is a large difference in the air gaps before and after the fifth lens, and the air gap between the fourth and fifth lenses is relatively sensitive, which affects the propagation path of light between the lenses. Non-imaging light is prone to multiple reflections on the lens surface, eventually entering the imaging plane and forming stray light. Based on this, this application, by constraining the relationship between the inner and outer diameter difference (D5s-d5s) of the object side of the fifth spacer element and the distance EP45 along the optical axis between the image side of the fourth spacer element and the object side of the fifth spacer element, rationally designs the thickness of the fifth spacer element and the edge of the fifth lens. This can effectively intercept the light reflected by the fifth lens, while reducing the phenomenon of light entering the fifth lens after being reflected at the surface of the sixth lens and undergoing multiple total internal reflections, effectively improving the stray light problem and enhancing the imaging quality of the optical lens.

[0059] For example, Figure 14A and Figure 14B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=5.43; Figure 15A and Figure 15B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=5.58; Figure 16A and Figure 16B The spot pattern and stray light path diagram of the optical lens are shown respectively when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25 and (D5s-d5s) / EP45=1.25; Figure 17A and Figure 17B The image shows the spotlight pattern and stray light path diagram of the optical lens when the incident light angle is 36°, T45 / T56=2.13, f5 / f=3.25, and (D5s-d5s) / EP45=7.76. It is easy to see from the figures that... Figure 14A , Figure 14B , Figure 15A and Figure 15BAs shown, when the relationships T45 / T56 are greater than 1.80 and less than 2.50, f5 / f are greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 are greater than 2.00 and less than 5.85, by reasonably setting (D5s-d5s) and EP45, stray light can be effectively blocked during propagation, thereby reducing the amount of stray light reaching the image side and helping to improve image quality; for example... Figure 16A and Figure 16B As shown, when the relationship T45 / T56 is greater than 1.80 and less than 2.50, f5 / f is greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 is less than 2.00, then (D5s-d5s) is relatively small and EP45 is relatively large. Stray light rays undergo multiple total internal reflections inside the fifth lens, easily bypassing the fifth spacer element and directly illuminating the sixth lens, leading to an increase in stray light on the imaging plane. Figure 17A and Figure 17B As shown, when the relationship T45 / T56 is greater than 1.80 and less than 2.50, f5 / f is greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 is greater than 5.85, (D5s-d5s) is larger and EP45 is smaller. That is, the distance between the fourth and fifth spacer elements is closer, and the light is more likely to be reflected on the object side of the sixth lens and re-enter the fifth lens. Multiple total internal reflections occur inside the fifth lens, and stray light is not easily intercepted, eventually producing arc-shaped stray light at the imaging plane.

[0060] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.45 < D6m / (CT6+T67) < 6.90; where D6m is the outer diameter of the image-side surface of the sixth spacer element, CT6 is the center thickness of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0061] This formula can reasonably limit T67, reducing the risk of interference between the sixth and seventh lenses during optical lens assembly. Simultaneously, the formula also considers the structural strength of the sixth lens, ensuring uniform mechanical stress distribution during lens assembly and preventing eccentricity or structural deformation due to dimensional mismatch, thus improving lens reliability.

[0062] In some embodiments of this application, the spacer assembly includes a first spacer element located between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens; the optical lens satisfies: 8.65 < R3 / EP12 < 11.80; where R3 is the radius of curvature of the object-side surface of the second lens, and EP12 is the distance along the optical axis between the image-side surface of the first spacer element and the object-side surface of the second spacer element.

[0063] The curvature of the second lens can be controlled by the above relationship, optimizing the propagation angle and path of light in the first spacer element, the second lens, and the second spacer element. This ensures that enough light enters the subsequent lenses, while avoiding an increase in the internal reflection path of the second lens due to excessive edge thickness, thereby reducing stray light generation and improving the performance of the optical lens.

[0064] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens, and an eighth spacing element located on the image side of the eighth lens and in contact with the image side of the eighth lens; the optical lens satisfies: 2.00 < EP78 / CT8 < 2.50; where EP78 is the distance along the optical axis between the image side of the seventh spacing element and the object side of the eighth spacing element, and CT8 is the center thickness of the eighth lens.

[0065] The above relationship can constrain the shape of the eighth lens, so that the ratio between the edge thickness and the center thickness of the eighth lens is within a reasonable range, ensuring the thickness uniformity of the eighth lens, avoiding stress concentration or breakage during the assembly process, and facilitating the processing and forming of the eighth lens.

[0066] In some embodiments of this application, the spacing assembly includes a sixth spacing element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: -4.00 < f6 / (d5m+d6s) ≤ -2.55; where f6 is the effective focal length of the sixth lens, d5m is the inner diameter of the image-side surface of the fifth spacing element, and d6s is the inner diameter of the object-side surface of the sixth spacing element.

[0067] By controlling the relationship between the effective focal length of the sixth lens, the image-side inner diameter of the fifth spacer element, and the object-side inner diameter of the sixth spacer element, the refraction angle of light in the sixth lens can be reduced. At the same time, the fifth and sixth spacers element can block some stray light within the lens, reducing stray light generated by the sixth lens and improving the image quality of the lens.

[0068] In some embodiments of this application, the spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 4.85 < TD / T78 < 5.45 and -3.85 < d7m / R15 < -2.15; where TD is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, d7m is the inner diameter of the image-side surface of the seventh spacer element, and R15 is the radius of curvature of the object-side surface of the eighth lens.

[0069] By controlling the ratio of TD / T78, the lens distribution can be adjusted, which helps to correct aberrations and compress the lens length. By constraining the relationship between d7m and R15, the seventh spacer element can effectively block stray light entering the eighth lens. At the same time, the radius of curvature of the image side of the eighth lens can adjust the optical power of the eighth lens, thereby controlling the exit angle of light at the edge of the eighth lens.

[0070] In some embodiments of this application, the spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image side of the second lens; the optical lens satisfies: 3.20≤f12 / (D2s-d2s)≤4.65; where f12 is the combined focal length of the first lens and the second lens, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

[0071] By limiting the range of the ratio of f12 to (D2s-d2s), it can be ensured that effective light rays are not blocked by the second spacer element, while non-imaging light rays can be effectively blocked by the second spacer element, thereby reducing stray light and improving the image quality of the lens. If the ratio of f12 to (D2s-d2s) is too large, it indicates that the aperture of the second spacer element is too large, and the second spacer element cannot effectively block excess non-imaging light rays and is difficult to effectively suppress stray light; if the ratio of f12 to (D2s-d2s) is too small, it indicates that the aperture of the second spacer element is too small, and the second spacer element will block effective imaging light rays, affecting image quality.

[0072] In some embodiments of this application, the optical lens satisfies: 8.05 < d4s / T45 < 8.80; where d4s is the inner diameter of the object side of the fourth spacer element, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0073] By properly controlling the range of this relationship, the fourth spacer element can effectively block stray light from the edge of the fourth lens image side, while limiting the deflection angle of the light rays emitted from the fourth lens. This helps to adjust the focusing and distribution of light in the lens group, thereby reducing aberrations and improving the clarity and contrast of the image.

[0074] In some embodiments of this application, the spacer assembly is located between the first lens and the second lens and is in contact with the image side of the first lens; the optical lens satisfies: 6.30 < f1 / d1s < 7.30; where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side of the first spacer element.

[0075] By limiting the range of f1 / d1s, the propagation path and light flux of light in the first lens can be controlled. At the same time, the inner diameter of the object side of the first spacer element can effectively block non-imaging light from entering the imaging surface, thereby improving the imaging performance of the optical lens.

[0076] In some embodiments of this application, the spacing assembly includes an eighth spacing element located on the image side of the eighth lens and in contact with the image side surface of the eighth lens; the optical lens satisfies: -0.90 < (R15 + R16) / d8s < -0.30; where R15 is the radius of curvature of the object side surface of the eighth lens, R16 is the radius of curvature of the image side surface of the eighth lens, and d8s is the inner diameter of the object side surface of the eighth spacing element.

[0077] By reasonably controlling the range of this relationship, the focusing difference of light before and after refraction at the eighth lens can be reduced, thereby reducing spherical aberration. It also helps to control the refraction and focusing of light in different directions, ensuring that light can be focused on the same plane in both vertical and horizontal directions, thus improving image quality and reducing light dispersion.

[0078] In some embodiments of this application, the spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens; the optical lens satisfies: 5.45 < D3s / (EP23+CT3) < 6.20; where D3s is the outer diameter of the object-side surface of the third spacer element, EP23 is the distance along the optical axis between the image-side surface of the second spacer element and the object-side surface of the third spacer element, and CT3 is the center thickness of the third lens.

[0079] By reasonably controlling the range of this relationship, the edge thickness and center thickness of the third lens can be constrained within a reasonable range, thereby improving the feasibility of forming the third lens; at the same time, by limiting the outer diameter of the object side of the third spacer element, the outer diameter of the image side of the third lens can be constrained, realizing the overall uniformity requirement of the third lens and helping to improve the assembly stability of the third lens.

[0080] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 5.05≤d7s / CT7<6.80; where d7s is the inner diameter of the object side of the seventh spacing element and CT7 is the center thickness of the seventh lens.

[0081] By limiting the range of d7s / CT7, the propagation path of light within the seventh lens can be optimized. If d7s / CT7 is too large, the seventh spacer element will not be able to block excess light, affecting image quality. If d7s / CT7 is too small, it will affect the light transmission of the seventh lens, making the optical system prone to vignetting and causing dark corners at the image edges.

[0082] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.35 < R12 / R13 ≤ 7.20 and 1.65 < CP6 / T67 < 2.55; wherein, R12 is the radius of curvature of the image-side surface of the sixth lens, R13 is the radius of curvature of the object-side surface of the seventh lens, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0083] The image-side radius of curvature of the sixth lens is larger than that of the object-side radius of curvature of the seventh lens, which may make the lens more sensitive to assembly offset. Under this condition, constraining CP6 and T67 helps to control the positions of the sixth and seventh lenses, reduce lens offset during assembly, and thus improve the assembly stability of the lenses.

[0084] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 3.55 < (EP45 + EP56) / T56 < 6.35; where EP45 is the distance along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, EP56 is the distance along the optical axis between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0085] By limiting the range of (EP45+EP56) / T56, it is helpful to constrain the edge thickness of the fifth lens and the edge thickness of the sixth lens, thereby improving the deformation resistance and structural strength of the fifth and sixth lenses; at the same time, controlling the air gap between the fifth and sixth lenses on the optical axis can prevent interference and scratches between the fifth and sixth lenses during assembly.

[0086] In some embodiments of this application, the optical lens satisfies: -7.15≤D4s×V4 / f4<-5.20; where D4s is the outer diameter of the object side of the fourth spacer element, V4 is the Abbe number of the fourth lens, and f4 is the effective focal length of the fourth lens.

[0087] By controlling the above relationship, it is possible to avoid optical path blockage or imaging plane shift caused by D4s being too large or f4 being too small. At the same time, it is also possible to effectively control the dispersion coefficient of the fourth lens, which is beneficial to ensure the light transmittance of the fourth lens, reduce dispersion, and improve imaging clarity.

[0088] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the optical lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, the optical lens may also include other numbers of spacers than those described in the above embodiments, as needed.

[0089] Some specific, non-limiting embodiments of the above-described implementations of this application are described in more detail below with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical lens (not shown in the figure), STO represents the aperture stop (not shown in the figure), S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the fifth lens E5, S10 represents the image-side plane of the fifth lens E5, S11 represents the object-side plane of the sixth lens E6, S12 represents the image-side plane of the sixth lens E6, S13 represents the object-side plane of the seventh lens E7, S14 represents the image-side plane of the seventh lens E7, S15 represents the object-side plane of the eighth lens E8, S16 represents the image-side plane of the eighth lens E8, S17 represents the object-side plane of the filter, S18 represents the image-side plane of the filter, and S19 represents the imaging plane.

[0090] Example 1

[0091] like Figure 2 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes the following lenses arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0092] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7; and an eighth spacing element P8 located on the image side of the eighth lens E8 and in contact with the image-side surface S16 of the eighth lens E8.

[0093] In this embodiment, the first lens E1 has positive optical power, the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is concave; the second lens E2 has positive optical power, the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is concave; the third lens E3 has negative optical power, the object-side surface S5 of the third lens E3 is convex, and the image-side surface S6 of the third lens E3 is concave; the fourth lens E4 has negative optical power, the object-side surface S7 of the fourth lens E4 is convex, and the image-side surface S8 of the fourth lens E4 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens E7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens E8 has negative optical power, its object-side surface S15 is concave, and its image-side surface S16 is convex.

[0094] In addition, Table 1 shows the basic optical parameters of the optical lens of Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0095] Table 1: Basic optical parameters of the optical lens in Example 1

[0096]

[0097] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation:

[0098] ;

[0099] in, Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; 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); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1 to S16 in Example 1.

[0100] Table 2-1: Aspherical coefficient table of the optical lens in Example 1

[0101]

[0102] Table 2-2: Aspherical coefficients of the optical lens in Example 1

[0103]

[0104] Example 2

[0105] like Figure 3 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 1, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0106] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2-1 and 2-2. However, the optical lens of Embodiment 2 has different structural parameters than the optical lens of Embodiment 1 above, that is, the difference between Embodiment 2 and Embodiment 1 above lies in the fact that the dimensional values ​​of some structural parameters in the optical lens are different.

[0107] Specifically, the values ​​of the relevant structural parameters in this second embodiment and the first embodiment are shown in Table 8 below, and the schematic diagrams of each parameter in the optical lens structure diagram are shown below. Figure 1 As shown.

[0108] Example 3

[0109] like Figure 4 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 1, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0110] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2-1 and 2-2. However, the optical lens of Embodiment 3 has different structural parameters than the optical lens of Embodiment 1 above, that is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below.

[0111] The magnification chromatic aberration curves of the optical lenses in Examples 1, 2, and 3 are as follows: Figure 5AAs shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the on-axis chromatic aberration curves of the optical lenses in Embodiments 1, 2, and 3 are as follows: Figure 5B As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Embodiments 1, 2, and 3 are shown below. Figure 5C As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 5A , Figure 5B and Figure 5C It can be seen that the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0112] Example 4

[0113] like Figure 6 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes the following lenses arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0114] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7; and an eighth spacing element P8 located on the image side of the eighth lens E8 and in contact with the image-side surface S16 of the eighth lens E8.

[0115] In this embodiment, the first lens E1 has positive optical power, the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is concave; the second lens E2 has positive optical power, the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is concave; the third lens E3 has negative optical power, the object-side surface S5 of the third lens E3 is convex, and the image-side surface S6 of the third lens E3 is concave; the fourth lens E4 has negative optical power, the object-side surface S7 of the fourth lens E4 is convex, and the image-side surface S8 of the fourth lens E4 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens E7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens E8 has positive optical power, its object-side surface S15 is concave, and its image-side surface S16 is convex.

[0116] In addition, Table 3 shows the basic optical parameters of the optical lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0117] Table 3: Basic optical parameters of the optical lens in Example 4

[0118]

[0119] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 4-1 and 4-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S16 in Embodiment 4.

[0120] Table 4-1: Aspherical coefficient table of the optical lens in Example 4

[0121]

[0122] Table 4-2: Aspherical coefficient table of the optical lens in Example 4

[0123]

[0124] Example 5

[0125] like Figure 7As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 4, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0126] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. However, the optical lens of Embodiment 5 has different structural parameters than the optical lens of Embodiment 4 above, that is, the difference between Embodiment 5 and Embodiment 4 above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below.

[0127] Example 6

[0128] like Figure 8 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 4, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0129] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. However, the optical lens of Embodiment 6 has different structural parameters than the optical lens of Embodiment 4 above, that is, the difference between Embodiment 6 and Embodiment 4 above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below.

[0130] The magnification chromatic aberration curves of the optical lenses in Examples 4, 5, and 6 are as follows: Figure 9A As shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the on-axis chromatic aberration curves of the optical lenses in Embodiments 4, 5, and 6 are as follows. Figure 9B As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Examples 4, 5, and 6 are shown below. Figure 9C As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 9A , Figure 9B and Figure 9C It can be seen that the optical lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0131] Example 7

[0132] like Figure 10 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes the following lenses arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0133] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7; and an eighth spacing element P8 located on the image side of the eighth lens E8 and in contact with the image-side surface S16 of the eighth lens E8.

[0134] In this embodiment, the first lens E1 has positive optical power, the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is concave; the second lens E2 has positive optical power, the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is concave; the third lens E3 has negative optical power, the object-side surface S5 of the third lens E3 is convex, and the image-side surface S6 of the third lens E3 is concave; the fourth lens E4 has negative optical power, the object-side surface S7 of the fourth lens E4 is convex, and the image-side surface S8 of the fourth lens E4 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens E7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens E8 has positive optical power, its object-side surface S15 is concave, and its image-side surface S16 is convex.

[0135] In addition, Table 5 shows the basic optical parameters of the optical lens of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0136] Table 5: Basic optical parameters of the optical lens in Example 7

[0137]

[0138] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 6-1 and 6-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S16 in Embodiment 7.

[0139] Table 6-1: Aspherical coefficient table of the optical lens in Example 7

[0140]

[0141] Table 6-2: Aspherical coefficient table of the optical lens in Example 7

[0142]

[0143] Example 8

[0144] like Figure 11 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 7, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0145] It is worth noting that, compared with Embodiment Seven above, the optical lens of Embodiment Eight has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment Eight is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical lens of Embodiment Eight has different structural parameters than the optical lens of Embodiment Seven above, that is, the difference between Embodiment Eight and Embodiment Seven is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment Eight are shown in Table 8 below.

[0146] Example 9

[0147] like Figure 12As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are the same as in Embodiment 7, and the number of spacer elements and the installation position of each spacer element in the spacer assembly are the same as in Embodiment 1.

[0148] It is worth noting that, compared with Embodiment Seven above, the optical lens of Embodiment Nine has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment Nine is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical lens of Embodiment Nine has different structural parameters than the optical lens of Embodiment Seven above, that is, the difference between Embodiment Nine and Embodiment Seven above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment Nine are shown in Table 8 below.

[0149] The magnification chromatic aberration curves of the optical lenses in Examples 7, 8, and 9 are as follows: Figure 13A As shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the on-axis chromatic aberration curves of the optical lenses in Embodiments 7, 8, and 9 are as follows. Figure 13B As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Embodiments 7, 8, and 9 are shown below. Figure 13C As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 13A , Figure 13B and Figure 13C It can be seen that the optical lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0150] In summary, the optical parameters of the optical lenses in Examples 1 to 9 are shown in Table 7 below.

[0151] Table 7: Optical Parameters of Optical Lenses

[0152]

[0153] Furthermore, the specific structural parameters of the optical lenses in Examples 1 to 9 are shown in Table 8, and the units of the values ​​shown in Table 8 are all millimeters (mm).

[0154] Table 8: Structural Parameters of Optical Lenses

[0155]

[0156] In summary, the optical lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0157] Table 9: Relationships Satisfied by Optical Lenses

[0158]

[0159] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0160] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical lens, characterized in that: The system includes a lens barrel and a lens assembly and spacer assembly housed within the lens barrel. The lens assembly comprises, arranged sequentially along the optical axis from the object side to the image side: a first lens with positive optical power, having a convex object side and a concave image side; a second lens with positive optical power, having a convex object side and a concave image side; a third lens with negative optical power, having a convex object side and a concave image side; a fourth lens with negative optical power, having a convex object side and a concave image side; a fifth lens with positive optical power, having a convex object side and a concave image side; a sixth lens with negative optical power, having a concave object side and a concave image side; a seventh lens with positive optical power, having a convex object side and a convex image side; and an eighth lens with optical power, having a concave object side and a convex image side. The spacing assembly includes a fourth spacing element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fifth spacing element located between the fifth lens and the sixth lens and in contact with the image side of the fifth lens; The optical lens satisfies the following conditions: 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45; and 2.00 < (D5s - d5s) / EP45 < 5.85; Wherein, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, f5 is the effective focal length of the fifth lens, f is the effective focal length of the optical lens, D5s is the outer diameter of the object side of the fifth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis.

2. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.45 < D6m / (CT6+T67) < 6.90; where D6m is the outer diameter of the image-side surface of the sixth spacer element, CT6 is the center thickness of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

3. The optical lens according to claim 1, characterized in that, The spacer assembly includes a first spacer element located between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens; the optical lens satisfies: 8.65 < R3 / EP12 < 11.80; where R3 is the radius of curvature of the object-side surface of the second lens, and EP12 is the distance along the optical axis between the image-side surface of the first spacer element and the object-side surface of the second spacer element.

4. The optical lens according to claim 1, characterized in that, The spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens, and an eighth spacer element located on the image-side surface of the eighth lens and in contact with the image-side surface of the eighth lens; the optical lens satisfies: 2.00 < EP78 / CT8 < 2.50; where EP78 is the distance along the optical axis between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element, and CT8 is the center thickness of the eighth lens.

5. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: -4.00 < f6 / (d5m+d6s) ≤ -2.55; where f6 is the effective focal length of the sixth lens, d5m is the inner diameter of the image-side surface of the fifth spacer element, and d6s is the inner diameter of the object-side surface of the sixth spacer element.

6. The optical lens according to claim 1, characterized in that, The spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 4.85 < TD / T78 < 5.45 and -3.85 < d7m / R15 < -2.15; where TD is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, d7m is the inner diameter of the image-side surface of the seventh spacer element, and R15 is the radius of curvature of the object-side surface of the eighth lens.

7. The optical lens according to claim 1, characterized in that, The spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image side of the second lens; the optical lens satisfies: 3.20≤f12 / (D2s-d2s)≤4.65; where f12 is the combined focal length of the first lens and the second lens, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 8.05 < d4s / T45 < 8.80; where d4s is the inner diameter of the object side of the fourth spacer element, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

9. The optical lens according to claim 1, characterized in that, The spacer assembly is located between the first lens and the second lens and is in contact with the image side of the first lens; the optical lens satisfies: 6.30 < f1 / d1s < 7.30; where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side of the first spacer element.

10. The optical lens according to claim 1, characterized in that, The spacing assembly includes an eighth spacing element located on the image side of the eighth lens and in contact with the image side surface of the eighth lens; the optical lens satisfies: -0.90 < (R15 + R16) / d8s < -0.30; where R15 is the radius of curvature of the object side surface of the eighth lens, R16 is the radius of curvature of the image side surface of the eighth lens, and d8s is the inner diameter of the object side surface of the eighth spacing element.

11. The optical lens according to claim 1, characterized in that, The spacer assembly includes a second spacer element located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens; the optical lens satisfies: 5.45 < D3s / (EP23+CT3) < 6.20; where D3s is the outer diameter of the object-side surface of the third spacer element, EP23 is the distance along the optical axis between the image-side surface of the second spacer element and the object-side surface of the third spacer element, and CT3 is the center thickness of the third lens.

12. The optical lens according to claim 1, characterized in that, The spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 5.05≤d7s / CT7<6.80; where d7s is the inner diameter of the object side of the seventh spacer element and CT7 is the center thickness of the seventh lens.

13. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 5.35 < R12 / R13 ≤ 7.20 and 1.65 < CP6 / T67 < 2.55; where R12 is the radius of curvature of the image-side surface of the sixth lens, R13 is the radius of curvature of the object-side surface of the seventh lens, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

14. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical lens satisfies: 3.55 < (EP45 + EP56) / T56 < 6.35; where EP45 is the distance along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, EP56 is the distance along the optical axis between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

15. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -7.15≤D4s×V4 / f4<-5.20; where D4s is the outer diameter of the object side of the fourth spacer element, V4 is the Abbe number of the fourth lens, and f4 is the effective focal length of the fourth lens.

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