Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and a spacing assembly, wherein the lens group and the spacing assembly are accommodated in the lens barrel; the lens group comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from the object side to the image side in the optical axis direction. A seventh lens with positive focal power and an eighth lens with focal power; the optical lens satisfies the following conditions: T45 / T56 is more than 1.80 and less than 2.50; f5 / f is more than 2.90 and less than 3.45; and 2.00 < (D5s-d5s) / EP45 < 5.85.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging, in particular to an optical lens. BACKGROUND

[0002] Optical lenses with eight lenses gradually become the standard configuration of high-end professional imaging equipment because of their excellent aberration correction ability, high image resolution and high detail performance. However, on the other hand, due to the large number of lenses, the imaging quality of such optical lenses has high requirements for the spacing between adjacent lenses, especially the lens spacing at the center position of the lens. Taking the fifth lens as an example, the air gap before and after the fifth lens has a large gap, and the air gap between the fourth lens and the fifth lens is sensitive, which will affect the propagation path of light between lenses. Non-imaging light is easily reflected multiple times on the lens surface and eventually enters the imaging surface to form stray light. SUMMARY

[0003] The present application provides an optical lens which can effectively suppress the reflection of non-imaging light 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] The present application provides an optical lens, comprising a lens barrel, a lens group and a spacer assembly accommodated in the lens barrel;

[0005] The lens group comprises, in order from the object side to the image side along the optical axis direction: a first lens with positive refractive power, whose object side surface is convex and whose image side surface is concave; a second lens with positive refractive power, whose object side surface is convex and whose image side surface is concave; a third lens with negative refractive power, whose object side surface is convex and whose image side surface is concave; a fourth lens with negative refractive power, whose object side surface is convex and whose image side surface is concave; a fifth lens with positive refractive power, whose object side surface is convex and whose image side surface is concave; a sixth lens with negative refractive power, whose object side surface is concave and whose image side surface is concave; a seventh lens with positive refractive power, whose object side surface is convex and whose image side surface is convex; and an eighth lens with refractive power, whose object side surface is concave and whose image side surface is convex.

[0006] The spacer assembly comprises a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image side surface 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; wherein T45 is an air separation of the fourth lens and the fifth lens on the optical axis, T56 is an air separation of the fifth lens and the sixth lens on the optical axis, f5 is an effective focal length of the fifth lens, f is an effective focal length of the optical lens, D5s is an outer diameter of an object side surface of the fifth spacer element, d5s is an inner diameter of the object side surface of the fifth spacer element, and EP45 is a distance between an image side surface of the fourth spacer element and an object side surface of the fifth spacer element along the optical axis.

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

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

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

[0011] In some embodiments of the 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; wherein f6 is the effective focal length of the sixth lens, d5m is the image side inner diameter of the fifth spacing element, and d6s is the object side inner diameter of the sixth spacing element.

[0012] In some embodiments of the 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 surface of the seventh lens; the optical lens satisfies: 4.85 < TD / T78 < 5.45 and -3.85 < d7m / R15 < -2.15; wherein 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 spacing on the optical axis between the seventh lens and the eighth lens, d7m is the image side inner diameter of the seventh spacing element, and R15 is the object side surface curvature radius of the eighth lens.

[0013] In some embodiments of the application, the spacing assembly includes a second spacing 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: 3.20 ≤ f12 / (D2s-d2s) ≤ 4.65; wherein f12 is the combined focal length of the first lens and the second lens, D2s is the object side outer diameter of the second spacing element, and d2s is the object side inner diameter of the second spacing element.

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

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

[0016] In some embodiments of the 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; wherein R15 is the object side surface curvature radius of the eighth lens, R16 is the image side surface curvature radius of the eighth lens, and d8s is the object side inner diameter of the eighth spacing element.

[0017] In some embodiments of the application, the spacer assembly comprises 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; wherein D3s is the outer diameter of the object side surface of the third spacer element, EP23 is the distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis, and CT3 is the center thickness of the third lens.

[0018] In some embodiments of the application, the spacer assembly comprises 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: 5.05 ≤ d7s / CT7 < 6.80; wherein d7s is the inner diameter of the object side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0019] In some embodiments of the application, the spacer assembly comprises 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 separation of the sixth lens and the seventh lens along the optical axis.

[0020] In some embodiments of the application, the spacer assembly comprises 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; wherein 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, EP56 is the distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and T56 is the air separation of the fifth lens and the sixth lens along the optical axis.

[0021] In some embodiments of the application, the optical lens satisfies: -7.15 ≤ D4s x V4 / f4 < -5.20; wherein D4s is the outer diameter of the object side surface 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 the present application is composed of a lens barrel, eight lenses and at least two spacer elements, and satisfies 1.80 < T45 / T56 < 2.50; 2.90 < f5 / f < 3.45, which is conducive to 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 gap in the air gap before and after the fifth lens, and the air gap between the fourth lens and the fifth lens is relatively sensitive, which will affect the propagation path of light between lenses, and non-imaging light is easy to reflect multiple times on the lens surface and finally enter the imaging surface to form stray light. Based on this, by constraining the relationship between the inner and outer diameter difference (D5s-d5s) of the object side surface of the fifth spacer element and the distance EP45 of the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, the thickness of the fifth spacer element and the edge of the fifth lens is reasonably designed, which can effectively intercept the reflected light of the fifth lens, at the same time reduce the phenomenon that the light reflected on the surface of the sixth lens enters the fifth lens and multiple total reflection occurs, effectively improve the problem of stray light, and improve the imaging quality of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural parameter schematic diagram of an optical lens according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of an optical lens according to embodiment one of the present application;

[0025] Figure 3 is a structural schematic diagram of an optical lens according to embodiment two of the present application;

[0026] Figure 4 is a structural schematic diagram of an optical lens according to embodiment three of the present application;

[0027] Figure 5A shows the relative aperture aberration curve of the optical lens according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0028] Figure 5B shows the on-axis chromatic aberration curve of the optical lens according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0029] Figure 5C shows the astigmatism curve of the optical lens according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0030] Figure 6 is a structural schematic diagram of an optical lens according to embodiment four of the present application;

[0031] Figure 7is a structural schematic diagram of an optical lens according to Embodiment Five of the present application;

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

[0033] Figure 9A shows a schematic diagram of the relative illumination curves of the optical lenses according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

[0034] Figure 9B shows a schematic diagram of the axial chromatic aberration curves of the optical lenses according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

[0035] Figure 9C shows a schematic diagram of the astigmatism curves of the optical lenses according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

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

[0037] Figure 11 is a structural schematic diagram of an optical lens according to Embodiment Eight of the present application;

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

[0039] Figure 13A shows a schematic diagram of the relative illumination curves of the optical lenses according to the above Embodiment Seven, the above Embodiment Eight and the above Embodiment Nine of the present application;

[0040] Figure 13B shows a schematic diagram of the axial chromatic aberration curves of the optical lenses according to the above Embodiment Seven, the above Embodiment Eight and the above Embodiment Nine of the present application;

[0041] Figure 13C shows a schematic diagram of the astigmatism curves of the optical lenses according to the above Embodiment Seven, the above Embodiment Eight and the above Embodiment Nine of the present application;

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

[0043] Figure 15A and Figure 15BThe spot diagram and stray light path diagram of the optical lens are respectively shown when the incident light ray 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 diagram and stray light path diagram of the optical lens are respectively shown when the incident light ray 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 diagram and stray light path diagram of the optical lens are respectively shown when the incident light ray angle is 36°, T45 / T56 = 2.13, f5 / f = 3.25 and (D5s-d5s) / EP45 = 7.76. DETAILED DESCRIPTION

[0046] For a better understanding of the present application, various aspects of the application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only examples of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Throughout the specification, like reference numerals refer to like 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 the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0048] In the drawings, the thickness, size, and shape of lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn 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 set comprises, in order from the object side to the image side along the optical axis direction: a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fourth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a sixth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is concave; a seventh lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; and an eighth lens with refractive power, the object side surface of which is concave, and the image side surface of which is convex.

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

[0056] The optical lens satisfies: 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 interval of the fourth lens and the fifth lens on the optical axis, T56 is the air interval of 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 surface of the fifth interval element, d5s is the inner diameter of the object side surface of the fifth interval element, and EP45 is the distance between the image side surface of the fourth interval element and the object side surface of the fifth interval element along the optical axis direction.

[0058] In the above embodiments of the present application, the optical lens is composed of a lens barrel, eight lenses and at least two spacer elements, and satisfies 1.80 < T45 / T56 < 2.50 and 2.90 < f5 / f < 3.45, which is beneficial to control the field curvature of each field of view within a reasonable range and balance the spherical aberration and the field curvature of the optical system. However, there is a large gap between the air gaps in front of and behind the fifth lens, and the air gap between the fourth lens and the fifth lens is relatively sensitive, which will affect the propagation path of light between lenses. Non-imaging light is easily reflected multiple times on the lens surface and finally enters the imaging surface to form stray light. Based on this, by constraining the relationship between the inner and outer diameter difference (D5s-d5s) of the object side surface of the fifth spacer element and the distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, the thickness of the fifth spacer element and the edge of the fifth lens is reasonably designed, which can effectively intercept the reflected light of the fifth lens, reduce the phenomenon that the light reflected on the surface of the sixth lens enters the fifth lens and multiple total reflection occurs, effectively improve the stray light problem, and improve the imaging quality of the optical lens.

[0059] Exemplarily, Figure 14A and Figure 14B respectively show the spot diagram and the 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 = 5.43; Figure 15A and Figure 15B respectively show the spot diagram and the 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 = 5.58; Figure 16A and Figure 16B respectively show the spot diagram and the 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 = 1.25; Figure 17A and Figure 17B respectively show the spot diagram and the 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. As can be seen from the figures: Figure 14A , Figure 14B , Figure 15A and Figure 15BAs shown in FIG. 5, when the relationship T45 / T56 is in a range greater than 1.80 and less than 2.50, f5 / f is in a range greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 is in a range greater than 2.00 and less than 5.85, (D5s-d5s) and EP45 can be reasonably set to effectively block stray light during propagation, thereby reducing the amount of stray light reaching the image side and helping to improve imaging quality. Figure 16A and Figure 16B As shown in FIG. 5, when the relationship T45 / T56 is in a range greater than 1.80 and less than 2.50, f5 / f is in a range greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 is in a range less than 2.00, (D5s-d5s) is small and EP45 is large, the stray light rays inside the fifth lens undergo multiple total reflections, easily avoiding the shielding of the fifth spacer element and directly irradiating the sixth lens, resulting in an increase in the amount of stray light on the imaging surface. Figure 17A and Figure 17B As shown in FIG. 5, when the relationship T45 / T56 is in a range greater than 1.80 and less than 2.50, f5 / f is in a range greater than 2.90 and less than 3.45, and (D5s-d5s) / EP45 is in a range greater than 5.85, (D5s-d5s) is large and EP45 is small, that is, the distance between the fourth spacer element and the fifth spacer element is close, and the light rays are easily reflected on the object side of the sixth lens, re-entering the fifth lens and undergoing multiple total reflections inside the fifth lens. The stray light rays are not easily intercepted, and ultimately produce arc-shaped stray light at the imaging surface.

[0060] In some embodiments of the present 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 of the sixth lens; and the optical lens satisfies 5.45 < D6m / (CT6+T67) < 6.90; wherein D6m is the image side outer diameter of the sixth spacer element, CT6 is the center thickness of the sixth lens, and T67 is the air gap of the sixth lens and the seventh lens on the optical axis.

[0061] This relationship can reasonably limit T67 and reduce the risk of mutual interference between the sixth lens and the seventh lens during assembly of the optical lens. At the same time, the above relationship can also take into account the structural strength of the sixth lens, ensuring that the mechanical stress is evenly distributed during assembly of the lens, preventing the sixth lens from being eccentric or deformed due to size mismatch, and helping to improve the reliability of the lens.

[0062] In some embodiments of the present application, the spacing assembly comprises a first spacing 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 spacing 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; wherein R3 is the curvature radius of the object-side surface of the second lens, and EP12 is the distance between the image-side surface of the first spacing element and the object-side surface of the second spacing element along the optical axis.

[0063] The above relationship can control the bending degree of the second lens, optimize the propagation angle and path of light in the first spacing element, the second lens and the second spacing element, ensure that sufficient light enters the subsequent lens, and at the same time avoid the increase of internal reflection light path of the second lens due to the too large edge thickness of the second lens, thereby reducing the generation of stray light and improving the performance of the optical lens.

[0064] In some embodiments of the present application, the spacing assembly comprises a seventh spacing 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 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: 2.00 < EP78 / CT8 < 2.50; wherein EP78 is the distance between the image-side surface of the seventh spacing element and the object-side surface of the eighth spacing element along the optical axis, 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, ensure the thickness uniformity of the eighth lens, avoid the problem of stress concentration or fracture of the eighth lens during assembly, and be conducive to the processing and molding of the eighth lens.

[0066] In some embodiments of the present application, the spacing assembly comprises 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; wherein 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 inner diameter of the image-side surface of the fifth spacing element and the inner diameter of the object-side surface of the sixth spacing element, the refractive angle of light in the sixth lens can be reduced, and at the same time the fifth spacing element and the sixth spacing element can block a part of the stray light in the lens, reduce the stray light generated by the sixth lens, and improve the imaging quality of the lens.

[0068] In some embodiments of the 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 surface of the seventh lens; and the optical lens satisfies: 4.85 < TD / T78 < 5.45 and -3.85 < d7m / R15 < -2.15; wherein 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 spacing on the optical axis between the seventh lens and the eighth lens, d7m is the inner diameter of the image side surface of the seventh spacing element, and R15 is the curvature radius of the object side surface of the eighth lens.

[0069] By controlling the proportional relationship of TD / T78, the distribution of lenses can be adjusted, which helps to correct aberration and compress the length of the lens; by restricting the relationship between d7m and R15, the seventh spacing element can effectively block stray light entering the eighth lens, and the curvature radius of the image side surface of the eighth lens can adjust the refractive power of the eighth lens, thereby controlling the exit angle of light at the edge of the eighth lens.

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

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

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

[0073] By reasonably controlling the range of the relationship, the fourth spacing element can effectively intercept the edge stray light of the image side of the fourth lens, while limiting the deflection angle of the outgoing light of the fourth lens, which helps to adjust the focusing and distribution of light in the lens group, thereby reducing aberration and improving the clarity and contrast of imaging.

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

[0075] By limiting the range of f1 / d1s, the propagation path and light flux size of the light in the first lens can be controlled, and the object side inner diameter of the first spacing 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 the present 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 of the eighth lens; and the optical lens satisfies: -0.90 < (R15+R16) / d8s < -0.30; wherein R15 is the curvature radius of the object side of the eighth lens, R16 is the curvature radius of the image side of the eighth lens, and d8s is the inner diameter of the object side of the eighth spacing element.

[0077] By reasonably controlling the range of the relationship, the focusing difference of light before and after refraction at the eighth lens can be reduced, thereby reducing spherical aberration, and it is also helpful to control the refraction and focusing of light in different directions to ensure that light can be focused on the same plane in the vertical and horizontal directions, thereby improving imaging quality and reducing light dispersion.

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

[0079] By reasonably controlling the range of the relationship, the edge thickness and the center thickness of the third lens can be constrained in a reasonable range, so as to improve the forming feasibility of the third lens; meanwhile, by limiting the outer diameter of the object side surface of the third spacer element, the outer diameter size of the image side surface of the third lens can be constrained, the uniformity requirement of the third lens as a whole is realized, and the assembly stability of the third lens is improved.

[0080] In some embodiments of the present 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: 5.05≤d7s / CT7<6.80; wherein d7s is the inner diameter of the object side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0081] By limiting the range of d7s / CT7, the propagation path of light in the seventh lens can be optimized; if d7s / CT7 is too large, the seventh spacer element cannot intercept excess light, affecting the imaging quality; if d7s / CT7 is too small, the light flux of the seventh lens will be affected, the optical system is prone to vignetting, and the imaging edge is prone to appear dark corners.

[0082] In some embodiments of the present 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

[0083] The image side surface curvature radius of the sixth lens is larger than the object side surface curvature radius of the seventh lens, which may cause the lens to be more sensitive to assembly offset. Under this condition, by limiting CP6 and T67, the positions of the sixth lens and the seventh lens can be controlled, the offset of the lens in the assembly process is reduced, and the assembly stability of the lens is improved.

[0084] In some embodiments of the present application, the interval component includes a sixth interval 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; wherein EP45 is the distance between the image side surface of the fourth interval element and the object side surface of the fifth interval element along the optical axis direction, EP56 is the distance between the image side surface of the fifth interval element and the object side surface of the sixth interval element along the optical axis direction, and T56 is the air interval of the fifth lens and the sixth lens on the optical axis.

[0085] By limiting the range of (EP45+EP56) / T56, the fifth lens edge thickness and the sixth lens edge thickness are constrained, the anti-deformation ability and the structural strength of the fifth lens and the sixth lens are improved, and the air interval of the fifth lens and the sixth lens on the optical axis is controlled, so that interference and scratches of the fifth lens and the sixth lens during assembly are avoided.

[0086] In some embodiments of the present application, the optical lens satisfies: -7.15≤D4s×V4 / f4<-5.20; wherein D4s is the outer diameter of the object side surface of the fourth interval 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, the light path obstruction or the imaging plane deviation caused by too large D4s or too small f4 is avoided, the dispersion coefficient of the fourth lens is effectively controlled, the light transmittance of the fourth lens is ensured, the dispersion phenomenon is reduced, and the imaging clarity is improved.

[0088] It should be noted that those skilled in the art should understand that the number of interval elements constituting the optical lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification, which are not specifically limited by the present application. For example, the optical lens can also include other numbers of interval elements different from those described in the above embodiments according to needs.

[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: Aspheric surface coefficient table of the optical lens of Example One

[0103]

[0104] Example Two

[0105] As Figure 3 shown in the figure, in this example, the optical lens comprises a lens barrel and a lens group and a spacer assembly accommodated in the lens barrel; the number of lenses and the arrangement of lenses in the lens group are consistent with those of Example One, and the number of spacer elements and the mounting positions of the spacer elements in the spacer assembly are consistent with those of Example One.

[0106] It is worth noting that, compared with the above-mentioned Example One, the optical lens of this example has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this example is the same as Table 1, and the aspheric surface coefficient table is the same as Table 2-1 and Table 2-2. However, the optical lens of this example and the optical lens of the above-mentioned Example One have different structural parameters, i.e., the difference between this example and the above-mentioned Example One lies in that the size values of some structural parameters in the optical lens are different.

[0107] Specifically, the values of each relevant structural parameter in this example and the above-mentioned Example One are shown in Table 8 below, respectively, and the schematic in the structural diagram of the optical lens is shown in Figure 1 .

[0108] Example Three

[0109] As Figure 4 shown in the figure, in this example, the optical lens comprises a lens barrel and a lens group and a spacer assembly accommodated in the lens barrel; the number of lenses and the arrangement of lenses in the lens group are consistent with those of Example One, and the number of spacer elements and the mounting positions of the spacer elements in the spacer assembly are consistent with those of Example One.

[0110] It is worth noting that, compared with the above-mentioned Example One, the optical lens of this example has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this example is the same as Table 1, and the aspheric surface coefficient table is the same as Table 2-1 and Table 2-2. However, the optical lens of this example and the optical lens of the above-mentioned Example One have different structural parameters, i.e., the difference between this example and the above-mentioned Example One lies in that the size values of some structural parameters in the optical lens are different. Specifically, the values of each relevant structural parameter in this example are shown in Table 8 below, respectively.

[0111] The lateral chromatic aberration curves of the optical lenses in Example One, Example Two and Example Three are shown in 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 refractive power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is concave; the second lens E2 has positive refractive power, the object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is concave; the third lens E3 has negative refractive power, the object side S5 of the third lens E3 is convex, and the image side S6 of the third lens E3 is concave; the fourth lens E4 has negative refractive power, the object side S7 of the fourth lens E4 is convex, and the image side S8 of the fourth lens E4 is concave; the fifth lens E5 has positive refractive power, the object side S9 of the fifth lens E5 is convex, and the image side S10 of the fifth lens E5 is concave; the sixth lens E6 has negative refractive power, the object side S11 of the sixth lens E6 is concave, and the image side S12 of the sixth lens E6 is concave; the seventh lens E7 has positive refractive power, the object side S13 of the seventh lens E7 is convex, and the image side S14 of the seventh lens E7 is convex; the eighth lens E8 has positive refractive power, the object side S15 of the eighth lens E8 is concave, and the image side S16 of the eighth lens E8 is convex.

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

[0117] Table 3: Basic optical parameter table of the optical lens of Embodiment Four

[0118]

[0119] In this embodiment, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by the aspherical surface formula given in Embodiment One above. The high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of the aspherical surfaces S1 to S16 that can be used in Embodiment Four are given in the following Table 4-1 and Table 4-2.

[0120] Table 4-1: Aspherical surface coefficient table of the optical lens of Embodiment Four

[0121]

[0122] Table 4-2: Aspherical surface coefficient table of the optical lens of Embodiment Four

[0123]

[0124] Embodiment Five

[0125] As 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 Example Seven, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0136] Table 5: Basic optical parameters table of the optical lens of Example Seven

[0137]

[0138] In this example, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by the aspherical surface formula given in the above-mentioned Example One. The following Table 6-1 and Table 6-2 give the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 which can be used for each aspherical mirror surface S1 to S16 in Example Seven.

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

[0140]

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

[0142]

[0143] Example Eight

[0144] As Figure 11 shown in this example, the optical lens includes a lens barrel, and a lens group and a spacer assembly accommodated in the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are consistent with those of Example Seven, and the number of spacer elements and the mounting positions of each spacer element in the spacer assembly are consistent with those of Example One.

[0145] It is worth noting that, compared with the above-mentioned Example Seven, the optical lens of this Example Eight has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this Example Eight is the same as Table 5, and the aspherical surface coefficient table is the same as Table 6-1 and Table 6-2. However, the optical lens of this Example Eight has different structural parameters from the optical lens of the above-mentioned Example Seven, i.e., the difference between this Example Eight and the above-mentioned Example Seven lies in that the size values of some structural parameters in the optical lens are different. Specifically, the values of each relevant structural parameter in this Example Eight are shown in Table 8 below.

[0146] Example Nine

[0147] As Figure 12As shown in the embodiment, the optical lens comprises a lens barrel, and a lens group and a spacer assembly accommodated in the lens barrel; the number of lenses and the arrangement of the lenses in the lens group are consistent with those of embodiment seven, and the number of spacer elements and the mounting positions of the spacer elements in the spacer assembly are consistent with those of embodiment one.

[0148] It is worth noting that, compared with the above-mentioned embodiment seven, the optical lens of the embodiment nine has the same optical parameters, i.e., the basic optical parameter table of the optical lens of the embodiment nine is the same as table 5, and the aspheric surface coefficient table is the same as table 6-1 and table 6-2. However, the optical lens of the embodiment nine and the optical lens of the above-mentioned embodiment seven have different structural parameters, i.e., the embodiment nine and the above-mentioned embodiment seven are different in that the size values of some structural parameters in the optical lens are different. Specifically, the values of each relevant structural parameter in the embodiment nine are shown in table 8 as follows.

[0149] The lateral chromatic aberration curve of the optical lens in embodiment seven, embodiment eight and embodiment nine is shown in Figure 13A , which represents the deviation of different image heights of light rays after passing through the optical lens; the on-axis chromatic aberration curve of the optical lens in embodiment seven, embodiment eight and embodiment nine is shown in Figure 13B , which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens; the astigmatism curve of the optical lens in embodiment seven, embodiment eight and embodiment nine is shown in Figure 13C , which represents the meridional image surface curvature and sagittal image surface curvature. According to Figure 13A , Figure 13B and Figure 13C , it can be known that the optical lens in embodiment seven, embodiment eight and embodiment nine can achieve good imaging quality.

[0150] In summary, in embodiment one to embodiment nine, the optical parameters of the optical lens are shown in table 7 as follows.

[0151] Table 7: Optical parameter table of optical lens

[0152]

[0153] In addition, the structural parameters of the optical lens in embodiment one to embodiment nine are shown in table 8 as follows, and the units of the values shown in table 8 are millimeters (mm).

[0154] Table 8: Structural parameter table of optical lens

[0155]

[0156] In summary, the optical lens in embodiment one to embodiment nine satisfies the relationship shown in table 9, which is shown in table 9 as follows.

[0157] Table 9: List of relationships satisfied by the optical lens

[0158]

[0159] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not result in a contradiction, it shall be considered within the scope of the present disclosure.

[0160] The above embodiments merely express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to 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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