Optical lens

Abstract

The application discloses an optical lens, comprising a lens barrel, a lens set and a plurality of spacers arranged in the lens barrel, wherein the lens set comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the plurality of spacers comprises a seventh spacer arranged between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens, and an eighth spacer arranged on the image side of the eighth lens and in contact with the image side surface of the eighth lens; the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d8s of the object side surface of the eighth spacer satisfy: -7 < (d7s + d8s) / (d7s - d8s) < -4; the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.15 < (f7 + f8) / (f7 - f8) < 0.3; and the refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens satisfy: 50 < (N8 + N7) / (N8 - N7) < 80.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] In recent years, with the continuous innovation of science and technology, the market has placed higher demands on the overall performance of lenses used in electronic products. In particular, some high-end imaging electronic products, in order to be applicable to a wider range of fields, not only require high image quality from lenses, but also increasingly higher requirements for their reliability and aesthetics. This poses a great challenge to the design of optical systems and structures.

[0003] Compared to lenses used in previous electronic imaging products, the updates and improvements in these performance or key parameters, along with enhanced reliability, have significantly increased the competitive advantage of high-quality lenses in the market. High image quality means a lens has a stronger ability to reproduce objects, displaying clearer images and lines, and producing more realistic images. The reliability of a lens with excellent optical performance determines the breadth of its applications, and the lens barrel and spacers are crucial components affecting lens reliability. Therefore, an excellent lens barrel and spacer structure design is particularly important. A streamlined, integrated lens barrel with uniform wall thickness and a small tilt angle contributes significantly to improving the overall reliability of the lens. Properly setting the width of the spacer ring and reducing the presence of long cantilevered spacers within the lens allows for a wider operating temperature range, enabling the lens to maintain reliable and stable imaging capabilities even in extreme temperature environments.

[0004] Furthermore, improper selection of the radius of curvature and refractive index of the last lens in an optical lens can lead to extremely low or even complete incompatibility between the manufactured lens and the back-end module. Therefore, in order to meet the market's application demand for high-quality lenses required for high-end imaging electronic products, it is of great practical significance to rationally design the spatial arrangement of the lens barrel, spacers, and lenses, reduce the compatibility risk between the optical lens and the back-end module, and realize an eight-element optical lens with high imaging quality, high reliability, and a more aesthetically pleasing design. Summary of the Invention

[0005] The present application provides an optical lens, which includes: a lens barrel, a lens group and a plurality of spacers disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the plurality of spacers include: a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; and an eighth spacer disposed on the image side of the eighth lens and in contact with the image side surface of the eighth lens; the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d8s of the object side surface of the eighth spacer satisfy: -7 < (d7s + d8s) / (d7s - d8s) < -4; the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.15 < (f7 + f8) / (f7 - f8) < 0.3; and the refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens satisfy: 50 < (N8 + N7) / (N8 - N7) < 80.

[0006] In one embodiment, the optical lens satisfies: 1.6 < V7 / V8 < 1.9 and -6.0 < f78 / (R7 + R8) < -3.5, where V7 is the Abbe number of the seventh lens, V8 is the Abbe number of the eighth lens, f78 is the combined focal length of the seventh lens and the eighth lens, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens.

[0007] In one embodiment, the optical lens satisfies: 0.1 < |(f2 + f3) / (R4 + R6)| < 0.9, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R4 is the curvature radius of the image side surface of the second lens, and R6 is the curvature radius of the image side surface of the third lens.

[0008] In one embodiment, the plurality of spacers further include: a second spacer disposed between the second lens and the third lens and in contact with the image side surface of the second lens; and a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical lens satisfies: 0.9 < d2s / d3s < 1.0 and 1.3 < EP23 / (CT2 - CT3) < 1.6, where d2s is the inner diameter of the object side surface of the second spacer, d3s is the inner diameter of the object side surface of the third spacer, EP23 is the spacer distance between the second spacer and the third spacer along the optical axis direction, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis.

[0009] In one embodiment, the plurality of spacers further includes: a second spacer disposed between the second lens and the third lens and in contact with the image side surface of the second lens; and a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical lens satisfies: 7.6 < CT2×(N2 + N3) / CT3 < 8.1 and 25.4 < EP23 / CP3 < 27.8, where N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, EP23 is the axial spacing distance between the second spacer and the third spacer, and CP3 is the maximum thickness of the third spacer along the optical axis.

[0010] In one embodiment, the plurality of spacers further includes: a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical lens satisfies: 1.1 < V4 / V7 < 1.6 and 0.9 < (f4 + f7) / (d4m + d7m) < 1.2, where V4 is the Abbe number of the fourth lens, V7 is the Abbe number of the seventh lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, d4m is the inner diameter of the image side surface of the fourth spacer, and d7m is the inner diameter of the image side surface of the seventh spacer.

[0011] In one embodiment, the plurality of spacers further includes: a second spacer disposed between the second lens and the third lens and in contact with the image side surface of the second lens; a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; and a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical lens satisfies: -70 < (f3 - f2) / EP23 < -40 and 45 < (f4 - f3) / EP34 < 80, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, EP23 is the axial spacing distance between the second spacer and the third spacer, and EP34 is the axial spacing distance between the third spacer and the fourth spacer.

[0012] In one embodiment, the plurality of spacers further includes: a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; and a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the optical lens satisfies: 0.7 < (R7 + R8) / d4s < 1.1 and 0.8 < (R9 + R10) / d5s < 1.0, where R7 is the radius of curvature of the object side surface of the fourth lens, R8 is the radius of curvature of the image side surface of the fourth lens, R9 is the radius of curvature of the object side surface of the fifth lens, R10 is the radius of curvature of the image side surface of the fifth lens, d4s is the inner diameter of the object side surface of the fourth spacer, and d5s is the inner diameter of the object side surface of the fifth spacer.

[0013] In one embodiment, the optical lens satisfies: 0.8 < (f7 + f8) / (CP7 + EP78 + CP8) < 2.0, where f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, CP7 is the maximum thickness of the seventh spacer along the optical axis direction, CP8 is the maximum thickness of the eighth spacer along the optical axis direction, and EP78 is the spacer distance between the seventh spacer and the eighth spacer along the optical axis direction.

[0014] In one embodiment, the plurality of spacers further includes: a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; and a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical lens satisfies: -15.5 < f3 / (D3s - d3s) < -7.5 and 7.5 < f4 / (D4s - d4s) < 10.0, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side surface of the third spacer, D3s is the outer diameter of the object side surface of the third spacer, f4 is the effective focal length of the fourth lens, d4s is the inner diameter of the object side surface of the fourth spacer, and D4s is the outer diameter of the object side surface of the fourth spacer.

[0015] In one embodiment, the plurality of spacers further includes: a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; and a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; the optical lens satisfies: 1.1 < N5 / N6 < 1.3 and -3.7 < (R10 / D5m)×(R12 / D6m) < -0.8, where N5 is the refractive index of the fifth lens, N6 is the refractive index of the sixth lens, R10 is the radius of curvature of the image side surface of the fifth lens, R12 is the radius of curvature of the image side surface of the sixth lens, D5m is the outer diameter of the image side surface of the fifth spacer, and D6m is the outer diameter of the image side surface of the sixth spacer.

[0016] In one embodiment, the optical lens satisfies: |CT6×V6 / f6| < 1.6, where CT6 is the central thickness of the sixth lens on the optical axis, V6 is the Abbe number of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0017] In one embodiment, the plurality of spacers further includes: a second spacer disposed between the second lens and the third lens and contacting the image side surface of the second lens; and a third spacer disposed between the third lens and the fourth lens and contacting the image side surface of the third lens; the optical lens satisfies: 25 < EP23 / CP3 < 28 and |CT4 / R7| < 0.2, where EP23 is the spacing distance between the second spacer and the third spacer in the optical axis direction, CP3 is the maximum thickness of the third spacer in the optical axis direction, CT4 is the central thickness of the fourth lens on the optical axis, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0018] In one embodiment, the plurality of spacers further includes: a fifth spacer disposed between the fifth lens and the sixth lens and contacting the image side surface of the fifth lens; and a sixth spacer disposed between the sixth lens and the seventh lens and contacting the image side surface of the sixth lens; the optical lens satisfies: -0.4 < D6s / R11 < 0.4 and 0.9 < V6×CP5 / CT6 < 1.1, where D6s is the outer diameter of the object side surface of the sixth spacer, R11 is the radius of curvature of the object side surface of the sixth lens, V6 is the Abbe number of the sixth lens, CP5 is the maximum thickness of the fifth spacer in the optical axis direction, and CT6 is the central thickness of the sixth lens on the optical axis.

[0019] The optical lens provided in this application includes eight lenses and multiple spacers. If the radii of curvature on both the object side and image side of the eighth lens and the refractive index of the eighth lens are not properly selected, the manufactured lens will have extremely low or even complete incompatibility with the back-end module. To reduce the risk of incompatibility between the optical lens and the back-end module, the optical lens provided in this application satisfies -7<(d7s+d8s) / (d7s-d8s)<-4, 0.15<(f7+f8) / (f7-f8)<0.3, and 50<(N8+N7) / (N8-N7)<80. On the one hand, by controlling the effective focal length of the seventh and eighth lenses and the annular band difference of the seventh and eighth spacers, structurally, it helps in the design and arrangement of the seventh and eighth lenses and the seventh and eighth spacers, as well as the processing of each individual component in the front-end stage. Manufacturing processes can minimize the risk of incompatibility between the optical lens and the back-end module. On the other hand, because the inner diameter of the side of the seventh and eighth spacers is constrained, stray light will be generated at the edges of the seventh and eighth imaging lenses, resulting in an increase in stray light on the imaging surface. At this time, the refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens are constrained to satisfy 50 < (N8 + N7) / (N8 - N7) < 80, which will change the light propagation path and deflection angle, so that the stray light can be blocked outside the seventh and eighth spacers, thereby reducing stray light on the imaging surface. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1A A structural layout diagram and schematic diagram of some parameters of an optical lens according to this application are shown;

[0022] Figure 1B The stray light diagram of the optical lens is shown when (N8+N7) / (N8-N7)=30;

[0023] Figure 1C The stray light diagram of the optical lens is shown when (N8+N7) / (N8-N7)=90;

[0024] Figure 1D The stray light diagram of the optical lens is shown when (N8+N7) / (N8-N7)=60;

[0025] Figure 2A A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown;

[0026] Figure 2B A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown;

[0027] Figure 2CA schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown;

[0028] Figures 3A to 3C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical lenses according to Embodiments 1 to 3 of this application are shown respectively.

[0029] Figure 4A A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown;

[0030] Figure 4B A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown;

[0031] Figure 4C A schematic diagram of the structure of an optical lens according to Embodiment 6 of this application is shown;

[0032] Figures 5A to 5C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical lenses according to Embodiments 4 to 6 of this application are shown respectively.

[0033] Figure 6A A schematic diagram of the structure of an optical lens according to Embodiment 7 of this application is shown;

[0034] Figure 6B A schematic diagram of the structure of an optical lens according to Embodiment 8 of this application is shown;

[0035] Figure 6C A schematic diagram of the structure of an optical lens according to Embodiment 9 of this application is shown; and

[0036] Figures 7A to 7C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical lenses according to Embodiments 7 to 9 of this application are shown respectively. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0041] 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.

[0042] 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 the 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.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer, etc. of that embodiment.

[0044] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1AThis diagram illustrates the structural layout and some parameters of an optical lens according to this application. Those skilled in the art will understand that some lens parameters commonly used in the art, such as the center thickness CT2 of the second lens on the optical axis, are not shown. Figure 1A As shown in the figure, Figure 1A The following is merely an example illustrating some parameters of the lens barrel and spacer of an optical lens according to this application, in order to better understand the present invention. Figure 1A As shown, EP23 is the spacing between the second and third spacers along the optical axis; EP34 is the spacing between the third and fourth spacers along the optical axis; EP78 is the spacing between the seventh and eighth spacers along the optical axis; CP3 is the maximum thickness of the third spacer along the optical axis; CP5 is the maximum thickness of the fifth spacer along the optical axis; CP7 is the maximum thickness of the seventh spacer along the optical axis; CP8 is the maximum thickness of the eighth spacer along the optical axis; d1s represents the inner diameter of the object-side surface of the first spacer; d2s represents the inner diameter of the object-side surface of the second spacer; d3s represents the inner diameter of the object-side surface of the third spacer; d 4s is the inner diameter of the object side of the fourth spacer, d5s is the inner diameter of the object side of the fifth spacer, D1s is the outer diameter of the object side of the first spacer, D4s is the outer diameter of the object side of the fourth spacer, D3s is the outer diameter of the object side of the third spacer, D6s is the outer diameter of the object side of the sixth spacer, d8s is the inner diameter of the object side of the eighth spacer, d1m is the inner diameter of the image side of the first spacer, D1m is the outer diameter of the image side of the first spacer, d4m is the inner diameter of the image side of the fourth spacer, D5m is the outer diameter of the image side of the fifth spacer, D6m is the outer diameter of the image side of the sixth spacer, and D7m is the outer diameter of the image side of the seventh spacer.

[0045] An optical lens according to an exemplary embodiment of this application includes a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group includes, in sequence along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein any two adjacent lenses among the first lens to the eighth lens may have a spacer distance between them.

[0046] In an exemplary embodiment, the plurality of spacers may include at least one of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, a seventh spacer, and an eighth spacer, wherein the first spacer is disposed between the first lens and the second lens and contacts the image-side surface of the first lens; the second spacer is disposed between the second lens and the third lens and contacts the image-side surface of the second lens; the third spacer is disposed between the third lens and the fourth lens and contacts the image-side surface of the third lens; the fourth spacer is disposed between the fourth lens and the fifth lens and contacts the image-side surface of the fourth lens; the fifth spacer is disposed between the fifth lens and the sixth lens and contacts the image-side surface of the sixth lens; the sixth spacer is disposed between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens; the seventh spacer is disposed between the seventh lens and the eighth lens and contacts the image-side surface of the seventh lens; and the eighth spacer is disposed on the image-side surface of the eighth lens and contacts the image-side surface of the eighth lens.

[0047] It should be understood that this application does not specifically limit the number of spacers; any number of spacers may be included between any two lenses, and the entire optical lens may also include any number of spacers. Spacers help the optical lens intercept excess reflective light paths, reducing stray light and ghosting. Adding auxiliary support between spacers and the lens barrel helps improve problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0048] In an exemplary embodiment, the optical lens according to this application satisfies: -7 < (d7s + d8s) / (d7s - d8s) < -4, 0.15 < (f7 + f8) / (f7 - f8) < 0.3, and 50 < (N8 + N7) / (N8 - N7) < 80, where d7s is the inner diameter of the object-side surface of the seventh spacer, d8s is the inner diameter of the object-side surface of the eighth spacer, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, N7 is the refractive index of the seventh lens, and N8 is the refractive index of the eighth lens. Constraining the relationship between the inner diameters of the object-side surfaces of the seventh and eighth spacers and the effective focal lengths of the seventh and eighth lenses helps the optical lens to better project images onto the image plane, achieving optimal relative illumination and resolution. Simultaneously, it allows for a wider range of surface profile shapes and material options for the eighth lens, minimizing the risk of incompatibility between the lens and the back-end module. However, because the inner diameter of the side of the seventh and eighth spacers is constrained, stray light will be generated at the edges of the seventh and eighth imaging lenses, resulting in an increase in stray light on the imaging surface. At this time, the refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens satisfy 50<(N8+N7) / (N8-N7)<80, which will change the light propagation path and deflection angle, so that the stray light can be blocked outside the seventh and eighth spacers, thus reducing the stray light on the imaging surface.

[0049] For example, Figure 1B The stray light diagram of the optical lens when (N8 + N7) / (N8 - N7) = 30 is shown. Figure 1C The stray light diagram of the optical lens when (N8 + N7) / (N8 - N7) = 90 is shown. Figure 1D The stray light diagram of the optical lens when (N8 + N7) / (N8 - N7) = 60 is shown. It can be seen that when the refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens satisfy the range of the conditional formula 50 < (N8 + N7) / (N8 - N7) < 80, the stray light on the imaging surface is the least.

[0050] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.6 < V7 / V8 < 1.9 and -6.0 < f78 / (R7 + R8) < -3.5, where V7 is the Abbe number of the seventh lens, V8 is the Abbe number of the eighth lens, f78 is the combined focal length of the seventh lens and the eighth lens, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens. By satisfying 1.6 < V7 / V8 < 1.9 and -6.0 < f78 / (R7 + R8) < -3.5, the combined focal length of the seventh and eighth lenses, the refractive indices of the seventh and eighth lenses, and the curvature radii of the object side surface and the image side surface of the fourth lens are mutually restricted to control the surface shape of the effective diameter of the fourth lens in the system. On the one hand, the light transmitted through the fourth lens is effectively focused and received on the lens behind it. On the other hand, the chromatic aberration of the lens imaging can be better controlled, and it is beneficial to the design and arrangement of the fourth lens mechanism.

[0051] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.1 < |(f2 + f3) / (R4 + R6)| < 0.9, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R4 is the curvature radius of the image side surface of the second lens, and R6 is the curvature radius of the image side surface of the third lens. By controlling the effective focal lengths of the second lens and the third lens and the curvature radii of their image side surfaces, the surface shapes of these two adjacent lenses are controlled. On the premise of satisfying the light flux of the second spacer, the imaging is made clearer, which is beneficial to avoiding the phenomenon that the distance between these two adjacent lenses is too small and interfering with these two lenses during the assembly of the second spacer, resulting in extremely difficult assembly.

[0052] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.9 < d2s / d3s < 1.0 and 1.3 < EP23 / (CT2 - CT3) < 1.6, where d2s is the inner diameter of the object side surface of the second spacer, d3s is the inner diameter of the object side surface of the third spacer, EP23 is the spacing distance between the second spacer and the third spacer along the optical axis direction, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By mutually constraining the inner diameters of the object side surfaces of the second spacer and the third spacer, and the central thicknesses of the second lens and the third lens, the design limit of the second spacer caused by the large difference in the central thicknesses of the adjacent second and third lenses is effectively avoided, and the risk of being unable to actually produce is greatly reduced.

[0053] In an exemplary embodiment, the optical lens according to the present application can satisfy: 7.6 < CT2×(N2 + N3) / CT3 < 8.1 and 25.4 < EP23 / CP3 < 27.8, where N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, EP23 is the spacing distance between the second spacer and the third spacer along the optical axis direction, and CP3 is the maximum thickness of the third spacer along the optical axis direction. By constraining the central thicknesses, refractive indices of the second lens and the third lens, the spacing distance between the second spacer and the third spacer along the optical axis direction, and the maximum thickness of the third spacer, while meeting the market demand for optical performance, the stacking design of the lens and the spacer and the manufacturing of single components are better balanced.

[0054] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.1 < V4 / V7 < 1.6 and 0.9 < (f4 + f7) / (d4m + d7m) < 1.2, where V4 is the Abbe number of the fourth lens, V7 is the Abbe number of the seventh lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, d4m is the inner diameter of the image side surface of the fourth spacer, and d7m is the inner diameter of the image side surface of the seventh spacer. Satisfying 1.1 < V4 / V7 < 1.6 and 0.9 < (f4 + f7) / (d4m + d7m) < 1.2 is more conducive to the passing and blocking of the light flux between the fourth lens and the seventh lens, making the front optical system and the rear optical system of the fourth lens more accurately承接, facilitating the structural arrangement to meet the streamline design, and enabling the optical performance and appearance of the lens to reach the best state.

[0055] In an exemplary embodiment, the optical lens according to this application satisfies: -70 < (f3-f2) / EP23 < -40 and 45 < (f4-f3) / EP34 < 80, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, EP23 is the distance between the second and third spacers along the optical axis, and EP34 is the distance between the third and fourth spacers along the optical axis. Satisfying -70 < (f3-f2) / EP23 < -40 and 45 < (f4-f3) / EP34 < 80 controls the effective focal lengths of the second, third, and fourth lenses, which is beneficial for better reception of the light projected by the second, third, and fourth lenses. At the same time, controlling the spacing of the second, third, and fourth spacers can better ensure the thickness of the non-imaging mechanism of the second, third, and fourth lenses, making assembly more stable, reliable, and improving subsequent stray light.

[0056] In an exemplary embodiment, the optical lens according to this application can satisfy: 0.7 < (R7 + R8) / d4s < 1.1 and 0.8 < (R9 + R10) / d5s < 1.0, where R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, R9 is the radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, d4s is the inner diameter of the object side of the fourth spacer, and d5s is the inner diameter of the object side of the fifth spacer. Satisfying 0.7 < (R7 + R8) / d4s < 1.1 and 0.8 < (R9 + R10) / d5s < 1.0, the mutual constraint between the curvature radii of the object and image sides of the fourth and fifth lenses and the inner diameters of the fourth and fifth spacers helps to control the transmission and reception of effective light between the fourth and fifth lenses. The constraint on the outer ring of the inner diameter of the fourth and fifth spacers can better block unnecessary light and help reduce stray light.

[0057] In an exemplary embodiment, the optical lens according to this application satisfies: 0.8 < (f7 + f8) / (CP7 + EP78 + CP8) < 2.0, where f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, CP7 is the maximum thickness of the seventh spacer along the optical axis, CP8 is the maximum thickness of the eighth spacer along the optical axis, and EP78 is the distance between the seventh and eighth spacers along the optical axis. Satisfying 0.8 < (f7 + f8) / (CP7 + EP78 + CP8) < 2.0, by constraining the effective focal lengths of the seventh and eighth lenses, the thicknesses of the seventh and eighth spacers, and the distance between them, allows for a better distribution of the effective focal lengths of the seventh and eighth lenses and the thicknesses of the seventh and eighth spacers, which is more beneficial to their contribution to the entire lens, resulting in better image quality and reducing the risk of imaging anomalies such as astigmatism and distortion.

[0058] In an exemplary embodiment, the optical lens according to the present application can satisfy: -15.5 < f3 / (D3s - d3s) < -7.5 and 7.5 < f4 / (D4s - d4s) < 10.0, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side surface of the third spacer, D3s is the outer diameter of the object side surface of the third spacer, f4 is the effective focal length of the fourth lens, d4s is the inner diameter of the object side surface of the fourth spacer, and D4s is the outer diameter of the object side surface of the fourth spacer. Satisfying -15.5 < f3 / (D3s - d3s) < -7.5 and 7.5 < f4 / (D4s - d4s) < 10.0, through the mutual constraint of the effective focal lengths of the third and fourth lenses and the annular difference of the third and fourth spacers, it helps the optical system design at the front end of the system while taking into account the annular width of the third and fourth spacers. Not only is it more suitable for mass production, but the mutual constraint of the relationship also helps the design of the non-effective diameter structure of the lens.

[0059] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.1 < N5 / N6 < 1.3 and -3.7 < (R10 / D5m)×(R12 / D6m) < -0.8, where N5 is the refractive index of the fifth lens, N6 is the refractive index of the sixth lens, R10 is the radius of curvature of the image side surface of the fifth lens, R12 is the radius of curvature of the image side surface of the sixth lens, D5m is the outer diameter of the image side surface of the fifth spacer, and D6m is the outer diameter of the image side surface of the sixth spacer. By controlling the mutual constraint of the radius of curvature of the image side surfaces of the fifth and sixth lenses and the outer diameters of the fifth and sixth spacers, the shape matching characteristics of the lens barrel can be better controlled, making the lens assembly more stable. However, at the same time, the change in the radius of curvature will cause stray light in the lens. At this time, by controlling the refractive indices of the fifth and sixth lenses, the excess stray light can be eliminated.

[0060] In an exemplary embodiment, the optical lens according to the present application can satisfy: |CT6×V6 / f6| < 1.6, where CT6 is the central thickness of the sixth lens on the optical axis, V6 is the Abbe number of the sixth lens, and f6 is the effective focal length of the sixth lens. Satisfying |CT6×V6 / f6| < 1.6, by constraining the central thickness, Abbe number, and effective focal length of the sixth lens, it is beneficial to reduce the stray light at the imaging of the lens and at the sixth lens, improving the imaging quality.

[0061] In an exemplary embodiment, the optical lens according to the present application can satisfy: 25 < EP23 / CP3 < 28 and |CT4 / R7| < 0.2, where EP23 is the spacing distance between the second spacer and the third spacer along the optical axis direction, CP3 is the maximum thickness of the third spacer along the optical axis direction, CT4 is the central thickness of the fourth lens on the optical axis, and R7 is the curvature radius of the object side surface of the fourth lens. By comprehensively constraining the spacing between the second and third spacers, the maximum thickness of the third spacer, the central thickness of the fourth lens, and the curvature radius of the object side surface of the fourth lens, a certain space is left for the design of the non-effective diameter mechanism of the third lens, the central thickness of the fourth lens is constrained, and the situation that the spacing between the fourth lens and its adjacent lenses is too small is avoided to the greatest extent, which is beneficial to ensuring the reliability of the lens and making the imaging of the lens more stable and reliable during use.

[0062] In an exemplary embodiment, the optical lens according to the present application can satisfy: -0.4 < D6s / R11 < 0.4 and 0.9 < V6×CP5 / CT6 < 1.1, where D6s is the outer diameter of the object side surface of the sixth spacer, R11 is the curvature radius of the object side surface of the sixth lens, V6 is the Abbe number of the sixth lens, CP5 is the maximum thickness of the fifth spacer along the optical axis direction, and CT6 is the central thickness of the sixth lens on the optical axis. By jointly and mutually constraining the outer diameter of the object side surface of the sixth spacer, the curvature radius of the object side surface of the sixth lens, the Abbe number of the sixth lens, the central thickness, and the thickness of the fifth spacer, it is beneficial to compensate for a certain single component with high sensitivity and difficult manufacturability that appears inside the lens; under the requirements of low dispersion and high image quality, the optical effects generated by the lens and the spacer are mutually offset, and finally the best imaging state is achieved.

[0063] In an exemplary embodiment, the first lens may have a negative optical power, the second lens may have a positive optical power, the third lens may have a negative optical power, the fourth lens may have a positive optical power, the fifth lens may have a positive or negative optical power, the sixth lens may have a positive or negative optical power, the seventh lens may have a positive optical power, and the eighth lens may have a negative optical power.

[0064] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the eighth lens are aspherical surfaces.

[0065] In an exemplary embodiment, the optical lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0066] The optical lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers among the lenses, the range of each lens-lens fit with the lens barrel is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the ultra-thin, large-image-plane, and miniaturized optical lens. However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical lens is not limited to including eight lenses. If necessary, the optical lens may also include other numbers of lenses.

[0067] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings. Specifically, referring to... Figures 2A to 3C Description of optical lenses according to embodiments 1, 2, and 3 of this application; see reference Figures 4A to 5C Description of optical lenses according to embodiments 4, 5, and 6 of this application; see also 6A to Figure 7C The optical lenses according to embodiments 7, 8, and 9 of this application are described.

[0068] Example 1

[0069] Figure 2A A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown. Figure 2A As shown, the optical lens of Embodiment 1 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers.

[0070] like Figure 2A As shown, the lens group of the optical lens in Embodiment 1, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E7, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging plane (IMG).

[0071] Table 1 shows the basic parameters of the lens group of the optical lens of Example 1, where the units for radius of curvature, thickness and effective focal length are millimeters (mm).

[0072]

[0073]

[0074] Table 1

[0075] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0076]

[0077] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 give the higher-order coefficients A4, A6, A8, A16, A27, A18, A19 ... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0078] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.19E-01 6.58E-03 -7.65E-03 1.76E-03 -4.74E-04 1.58E-04 -2.65E-05 S2 8.79E-02 5.01E-02 -1.48E-02 3.20E-03 -7.87E-04 1.93E-04 -6.61E-05 S3 -4.06E-01 2.24E-02 -5.75E-03 1.24E-03 1.84E-04 -2.97E-04 -1.31E-04 S4 -3.88E-01 -7.57E-04 2.31E-02 -7.49E-03 1.98E-03 -1.40E-03 1.58E-04 S5 -4.85E-01 1.02E-01 -2.22E-02 4.89E-03 -2.53E-03 1.44E-04 1.33E-04 S6 -6.07E-01 1.14E-01 -2.73E-02 6.41E-03 -2.75E-03 5.57E-04 -4.53E-05 S7 -1.81E-01 2.53E-03 1.64E-02 -6.95E-03 1.13E-03 -6.27E-04 2.06E-04 S8 2.42E-01 -4.74E-02 7.34E-03 -2.55E-03 7.04E-04 -2.36E-04 6.81E-06 S9 -3.31E-01 8.02E-02 -1.38E-02 3.24E-03 -7.67E-04 1.76E-04 -2.00E-04 S10 -4.03E-01 1.17E-01 -1.84E-02 6.71E-03 -2.00E-03 8.31E-04 -3.90E-04 S11 2.50E-01 3.49E-02 -4.31E-04 5.25E-04 -2.10E-04 2.57E-04 3.46E-04 S12 -6.15E-01 5.26E-02 -1.91E-03 -1.07E-03 4.49E-03 -1.38E-03 1.07E-03 S13 -1.12E+00 5.04E-02 8.61E-02 -1.76E-02 5.04E-03 -3.48E-03 1.49E-03 S14 -4.66E-02 -1.86E-02 7.92E-02 -1.69E-02 4.03E-03 -2.99E-03 4.96E-06 S15 -2.22E+00 2.32E-01 -1.10E-01 1.24E-02 -5.94E-03 -2.87E-03 -9.92E-04 S16 -4.06E+00 7.64E-01 -2.38E-01 8.90E-02 -3.36E-02 1.06E-02 -3.83E-03

[0079] Table 2-1

[0080]

[0081]

[0082] Table 2-2

[0083] Table 3 shows the values ​​of the effective focal length f of the optical lens in this embodiment, and the combined focal length f78 of the seventh lens and the eighth lens.

[0084] parameter f(mm) f78(mm) numerical values 6.36 -19.64

[0085] Table 3

[0086] like Figure 2AAs shown, the optical lens of Embodiment 1 further includes eight spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The first spacer P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; the sixth spacer P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens; the seventh spacer P7 is positioned on the image side of the seventh lens and at least partially contacts the image side of the seventh lens; and the eighth spacer P8 is positioned on the image side of the eighth lens and at least partially contacts the image side of the eighth lens. Table 4 shows the basic parameters of the spacer of the optical lens in Embodiment 1. The unit of each parameter in Table 4 is millimeters (mm). The aforementioned spacer can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0087] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 4.563 4.563 6.410 6.410 4.709 5.069 6.801 6.008 6.594 6.568 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 5.951 8.106 8.302 8.302 5.959 5.959 8.498 8.253 0.594 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.370 0.022 0.022 1.502 0.511

[0088] Table 4

[0089] Example 2

[0090] Figure 2B A schematic diagram of the optical lens according to Embodiment 2 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0091] like Figure 2B As shown, the optical lens of Embodiment 2 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens groups of the optical lens of Embodiment 2 are exactly the same as those of the optical lens of Embodiment 1, and their basic parameters are detailed in Tables 1 to 3, and will not be repeated here.

[0092] like Figure 2BAs shown, the optical lens of Embodiment 2 also includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 2 are the same as those in Embodiment 1, and will not be described again. Table 5 shows the basic parameters of the spacers in the optical lens of Embodiment 2, where all parameters are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0093] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 4.466 4.466 6.641 6.641 4.760 5.120 6.852 6.059 6.645 6.619 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 5.993 8.158 8.353 8.353 6.011 6.011 8.549 8.304 0.594 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.491 0.022 0.022 1.452 0.511

[0094] Table 5

[0095] Example 3

[0096] Figure 2C A schematic diagram of the optical lens according to Embodiment 3 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0097] like Figure 2C As shown, the optical lens of Embodiment 3 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens groups of the optical lens of Embodiment 3 are exactly the same as those of the optical lens of Embodiment 1, and their basic parameters are detailed in Tables 1 to 3, and will not be repeated here.

[0098] like Figure 2C As shown, the optical lens of Embodiment 3 further includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 3 are the same as those in Embodiment 1, and will not be repeated. Table 6 shows the basic parameters of the spacers in the optical lens of Embodiment 3; all parameters in Table 6 are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0099]

[0100] Table 6

[0101] Figure 3A The on-axis chromatic aberration curves of the optical lenses of Examples 1 to 3 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3BThe astigmatism curves of the optical lenses of Examples 1 to 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of the optical lenses of Examples 1 to 3 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 3A to 3C It can be seen that the optical lenses of Examples 1 to 3 can achieve good imaging quality.

[0102] Example 4

[0103] Figure 4A A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown. Figure 4A As shown, the optical lens of Embodiment 4 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers.

[0104] like Figure 4A As shown, the lens group of the optical lens in Embodiment 4, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E7, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging plane (IMG).

[0105] Table 7 shows the basic parameters of the lens group of the optical lens of Example 4, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0106]

[0107]

[0108] Table 7

[0109] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.53E-01 1.78E-04 -6.07E-03 1.69E-03 -4.18E-04 6.97E-05 -5.64E-05 S2 1.19E-01 4.35E-02 -1.44E-02 3.39E-03 -7.73E-04 1.57E-04 -4.76E-05 S3 -4.28E-01 2.96E-02 -8.30E-03 1.68E-03 2.13E-04 -3.43E-04 -6.65E-05 S4 -3.88E-01 -3.79E-03 2.54E-02 -9.59E-03 3.07E-03 -2.05E-03 5.97E-04 S5 -4.07E-01 8.98E-02 -1.85E-02 3.70E-03 -2.34E-03 -2.97E-05 3.02E-04 S6 -6.02E-01 1.17E-01 -2.68E-02 6.37E-03 -3.13E-03 9.20E-04 -1.83E-04 S7 -1.78E-01 2.00E-03 1.66E-02 -7.74E-03 1.55E-03 -5.61E-04 1.75E-04 S8 2.12E-01 -4.33E-02 4.57E-03 -2.00E-03 5.36E-04 -1.76E-04 -1.39E-06 S9 -2.77E-01 8.59E-02 -1.12E-02 3.18E-03 -9.14E-04 1.54E-04 -9.64E-05 S10 -2.94E-01 1.05E-01 -1.30E-02 5.35E-03 -1.66E-03 5.40E-04 -2.57E-04 S11 2.33E-01 3.42E-02 1.75E-03 4.52E-04 -1.22E-04 1.29E-04 2.84E-04 S12 -5.27E-01 3.72E-02 2.70E-03 -2.76E-03 4.41E-03 -8.85E-04 9.57E-04 S13 -9.80E-01 2.06E-02 9.03E-02 -1.61E-02 2.90E-03 -2.14E-03 1.45E-03 S14 5.52E-02 -3.22E-02 8.13E-02 -1.35E-02 1.82E-03 -2.10E-03 1.27E-04 S15 -2.21E+00 2.21E-01 -1.07E-01 1.24E-02 -6.44E-03 -2.49E-03 -1.32E-03 S16 -3.89E+00 7.25E-01 -2.20E-01 8.19E-02 -3.05E-02 9.75E-03 -3.79E-03

[0110] Table 8-1

[0111]

[0112]

[0113] Table 8-2

[0114] Table 9 shows the values ​​of the effective focal length f of the optical lens in this embodiment, and the combined focal length f78 of the seventh lens and the eighth lens.

[0115] parameter f(mm) f78(mm) numerical values 6.28 -19.00

[0116] Table 9

[0117] like Figure 4A As shown, the optical lens of Embodiment 4 further includes eight spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The first spacer P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; the sixth spacer P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens; the seventh spacer P7 is positioned on the image side of the seventh lens and at least partially contacts the image side of the seventh lens; and the eighth spacer P8 is positioned on the image side of the eighth lens and at least partially contacts the image side of the eighth lens. Table 10 shows the basic parameters of the spacer of the optical lens in Embodiment 4. The unit of each parameter in Table 10 is millimeters (mm). The aforementioned spacer can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0118] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 5.421 5.552 5.914 6.062 5.345 5.525 7.349 6.625 7.774 7.272 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 6.216 9.775 9.970 9.970 6.029 6.029 10.166 8.555 0.610 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.429 0.022 0.022 1.536 0.739

[0119] Table 10

[0120] Example 5

[0121] Figure 4B A schematic diagram of the optical lens according to Embodiment 5 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 4 are omitted.

[0122] like Figure 4B As shown, the optical lens of Embodiment 5 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens group of the optical lens of Embodiment 5 is exactly the same as that of the optical lens of Embodiment 4, and its basic parameters are detailed in Tables 7 to 9, and will not be repeated here.

[0123] like Figure 4B As shown, the optical lens of Embodiment 5 also includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 5 are the same as those in Embodiment 4, and will not be repeated. Table 11 shows the basic parameters of the spacers in the optical lens of Embodiment 5; all parameters in Table 11 are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0124] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 5.421 5.777 5.914 6.287 5.345 5.525 7.349 6.625 7.774 7.272 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 6.216 9.775 9.970 9.970 6.029 6.029 10.166 8.555 0.610 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.429 0.022 0.022 1.536 0.739

[0125] Table 11

[0126] Example 6

[0127] Figure 4C A schematic diagram of the optical lens according to Embodiment 6 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 4 are omitted.

[0128] like Figure 4C As shown, the optical lens of Embodiment 6 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens group of the optical lens of Embodiment 6 is exactly the same as that of the optical lens of Embodiment 4, and its basic parameters are detailed in Tables 7 to 9, and will not be repeated here.

[0129] like Figure 4C As shown, the optical lens of Embodiment 6 further includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 6 are the same as those in Embodiment 4, and will not be repeated. Table 12 shows the basic parameters of the spacers in the optical lens of Embodiment 6; all parameters in Table 12 are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0130] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 5.421 5.777 5.914 6.287 5.345 5.525 7.349 6.625 7.774 7.272 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 6.216 9.775 9.970 9.970 6.029 6.029 10.166 8.555 0.610 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.429 0.022 0.022 1.536 0.989

[0131] Table 12

[0132] Figure 5A The on-axis chromatic aberration curves of the optical lenses of Examples 4 to 6 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5BThe astigmatism curves of the optical lenses of Examples 4 to 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of the optical lenses of Examples 4 to 6 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 5A to 5C It can be seen that the optical lenses of Examples 4 to 6 can achieve good imaging quality.

[0133] Example 7

[0134] Figure 6A A schematic diagram of the structure of an optical lens according to Embodiment 7 of this application is shown. Figure 6A As shown, the optical lens of Embodiment 7 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers.

[0135] like Figure 6A As shown, the lens group of the optical lens in Embodiment 7, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E7, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging plane (IMG).

[0136] Table 13 shows the basic parameters of the lens group of the optical lens of Example 7, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 14-1 and 14-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0137]

[0138] Table 13

[0139]

[0140]

[0141] Table 14-1

[0142] Face number A18 A20 A22 A24 A26 A28 A30 S1 1.46E-05 -6.41E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 3.36E-05 -9.76E-06 -1.02E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 -2.73E-05 -4.72E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -1.44E-04 2.26E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -7.31E-05 2.76E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 -2.37E-05 1.57E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 -4.25E-05 1.51E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 3.38E-06 -3.07E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S9 2.19E-05 -7.85E-05 -6.29E-06 -6.95E-07 0.00E+00 0.00E+00 0.00E+00 S10 1.01E-04 -7.47E-05 -7.75E-06 -1.24E-06 -2.04E-07 0.00E+00 0.00E+00 S11 8.41E-05 4.24E-05 -6.19E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S12 -1.93E-04 1.10E-04 4.54E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S13 1.24E-04 -3.61E-05 -9.90E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S14 -2.74E-05 -1.51E-04 -6.58E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S15 -1.03E-03 -4.04E-04 -1.09E-04 -3.60E-05 -1.25E-05 -4.46E-06 -1.36E-06 S16 5.93E-04 1.98E-05 -3.53E-08 -6.34E-09 0.00E+00 0.00E+00 0.00E+00

[0143] Table 14-2

[0144] Table 15 shows the values ​​of the effective focal length f of the optical lens in this embodiment, and the combined focal length f78 of the seventh lens and the eighth lens.

[0145] parameter f(mm) f78(mm) numerical values 6.33 -37.99

[0146] Table 15

[0147] like Figure 6A As shown, the optical lens of Embodiment 7 further includes eight spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The first spacer P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; the sixth spacer P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens; the seventh spacer P7 is positioned on the image side of the seventh lens and at least partially contacts the image side of the seventh lens; and the eighth spacer P8 is positioned on the image side of the eighth lens and at least partially contacts the image side of the eighth lens. Table 16 shows the basic parameters of the spacer of the optical lens in Embodiment 7. The unit of each parameter in Table 16 is millimeters (mm). The aforementioned spacer can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0148] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 5.315 5.315 6.915 6.915 5.390 5.550 7.172 6.251 7.584 6.946 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 6.032 8.784 8.912 8.912 6.117 6.117 9.041 9.951 0.563 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.384 0.022 0.022 1.584 0.511

[0149] Table 16

[0150] Example 8

[0151] Figure 6B A schematic diagram of the optical lens according to Embodiment 8 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 7 are omitted.

[0152] like Figure 6B As shown, the optical lens of Embodiment 8 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens group of the optical lens of Embodiment 8 is exactly the same as that of the optical lens of Embodiment 7, and its basic parameters are detailed in Tables 13 to 15, and will not be repeated here.

[0153] like Figure 6BAs shown, the optical lens of Embodiment 8 further includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 8 are the same as those in Embodiment 7, and will not be described again. Table 17 shows the basic parameters of the spacers in the optical lens of Embodiment 8; all parameters in Table 17 are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0154]

[0155]

[0156] Table 17

[0157] Example 9

[0158] Figure 6C A schematic diagram of the optical lens according to Embodiment 9 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 7 are omitted.

[0159] like Figure 6C As shown, the optical lens of Embodiment 9 includes a lens barrel P0, lens groups E1 to E8, and multiple spacers. The lens group of the optical lens of Embodiment 9 is exactly the same as that of the optical lens of Embodiment 7, and its basic parameters are detailed in Tables 13 to 15, and will not be repeated here.

[0160] like Figure 6C As shown, the optical lens of Embodiment 9 also includes eight spacers: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a seventh spacer P7, and an eighth spacer P8. The positions of spacers P1 to P8 in Embodiment 9 are the same as those in Embodiment 7, and will not be repeated. Table 18 shows the basic parameters of the spacers in the optical lens of Embodiment 9; all parameters in Table 18 are in millimeters (mm). These spacers can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical lens.

[0161] parameter d1s d1m D1s D1m d2s d3s D3s d4s d4m D4s numerical values 5.566 5.614 6.554 6.284 5.358 5.525 7.146 6.225 7.559 6.921 parameter d5s D5m D6s D6m d7s d7m D7m d8s EP23 CP3 numerical values 6.007 8.758 8.887 8.887 6.201 6.092 9.015 9.926 0.563 0.022 parameter EP34 CP5 CP7 EP78 CP8 numerical values 0.384 0.022 0.022 1.584 1.054

[0162] Table 18

[0163] Figure 7AThe on-axis chromatic aberration curves of the optical lenses of Embodiments 7 to 9 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of the optical lenses of Examples 7 to 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of the optical lenses of Examples 7 to 9 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 7A to 7C It can be seen that the optical lenses of Examples 7 to 9 can achieve good imaging quality.

[0164] In summary, the optical lenses of Examples 1 to 9 satisfy the relationships shown in Table 19.

[0165]

[0166]

[0167] Table 19

[0168] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0169] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, include: The lens barrel, the lens assembly and multiple spacers disposed within the lens barrel, wherein, The lens group comprises, in sequence along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; The plurality of spacers includes: A seventh spacer is positioned between the seventh lens and the eighth lens and contacts the image-side surface of the seventh lens; and The eighth spacer is placed on the image side of the eighth lens and is in contact with the image side surface of the eighth lens; The optical lens has eight lenses with optical power. The first lens has negative optical power and its object side is concave. The second lens has positive optical power, with its object side being convex and its image side being concave. The third lens has negative optical power, and its object side is convex while its image side is concave. The fourth lens has positive optical power, and its object side is convex, as is its image side; The fifth lens has negative optical power, the sixth lens has positive optical power, or both the fifth lens and the sixth lens have positive or negative optical power. The object-side surface of the fifth lens is convex, and the image-side surface is concave. The image-side surface of the sixth lens is convex. The seventh lens has positive optical power, and both its object-side and image-side surfaces are convex. The eighth lens has negative optical power and its image-side surface is concave. The inner diameter d7s of the object side of the seventh spacer and the inner diameter d8s of the object side of the eighth spacer satisfy: -6.242≤(d7s+d8s) / (d7s-d8s)≤-4.178; and The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.189 ≤ (f7 + f8) / (f7 - f8) ≤ 0.268; and The refractive index N7 of the seventh lens and the refractive index N8 of the eighth lens satisfy the following condition: 53.330≤(N8+N7) / (N8-N7)≤75.

030.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditions: 1.659≤V7 / V8≤1.826 and -5.922≤f78 / (R7+R8)≤-3.805, where V7 is the Abbe number of the seventh lens, V8 is the Abbe number of the eighth lens, f78 is the combined focal length of the seventh and eighth lenses, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.124≤|(f2+f3) / (R4+R6)|≤0.840, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R4 is the radius of curvature of the image-side surface of the second lens, and R6 is the radius of curvature of the image-side surface of the third lens.

4. The optical lens according to claim 1, characterized in that, The plurality of spacers also include: A second spacer is positioned between the second lens and the third lens and contacts the image-side surface of the second lens; and The third spacer is placed between the third lens and the fourth lens and is in contact with the image side of the third lens; The optical lens satisfies the following conditions: 0.929≤d2s / d3s≤0.971 and 1.381≤EP23 / (CT2-CT3)≤1.546, where d2s is the inner diameter of the object side of the second spacer, d3s is the inner diameter of the object side of the third spacer, EP23 is the distance between the second spacer and the third spacer along the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

5. The optical lens according to claim 1, characterized in that, The plurality of spacers also include: A second spacer is positioned between the second lens and the third lens and contacts the image-side surface of the second lens; and The third spacer is placed between the third lens and the fourth lens and is in contact with the image side of the third lens; The optical lens satisfies the following conditions: 7.651≤CT2×(N2+N3) / CT3≤8.025 and 25.586≤EP23 / CP3≤27.741, where N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, EP23 is the spacing between the second spacer and the third spacer along the optical axis, and CP3 is the maximum thickness of the third spacer along the optical axis.

6. The optical lens according to claim 1, characterized in that, The plurality of spacers also include: The fourth spacer is placed between the fourth lens and the fifth lens and is in contact with the image side of the fourth lens; The optical lens satisfies the following conditions: 1.137≤V4 / V7≤1.581 and 0.921≤(f4+f7) / (d4m+d7m)≤1.135, where V4 is the Abbe number of the fourth lens, V7 is the Abbe number of the seventh lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, d4m is the inner diameter of the image-side surface of the fourth spacer, and d7m is the inner diameter of the image-side surface of the seventh spacer.

7. The optical lens according to claim 1, characterized in that, The plurality of spacers also include: The second spacer is placed between the second lens and the third lens and is in contact with the image side of the second lens; A third spacer is positioned between the third lens and the fourth lens and contacts the image-side surface of the third lens; and The fourth spacer is placed between the fourth lens and the fifth lens and is in contact with the image side of the fourth lens; The optical lens satisfies the following conditions: -65.728≤(f3-f2) / EP23≤-43.685 and 46.909≤(f4-f3) / EP34≤79.127, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, EP23 is the distance between the second spacer and the third spacer along the optical axis, and EP34 is the distance between the third spacer and the fourth spacer along the optical axis.

8. The optical lens according to claim 1, characterized in that, The plurality of spacers also include: A fourth spacer is positioned between the fourth lens and the fifth lens and contacts the image-side surface of the fourth lens; and The fifth spacer is placed between the fifth lens and the sixth lens and is in contact with the image side of the fifth lens; The optical lens satisfies the following conditions: 0.754≤(R7+R8) / d4s≤1.031 and 0.838≤(R9+R10) / d5s≤0.934, where R7 is the radius of curvature of the object-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, d4s is the inner diameter of the object-side surface of the fourth spacer, and d5s is the inner diameter of the object-side surface of the fifth spacer.

9. The optical lens according to any one of claims 1 to 8, characterized in that, The optical lens satisfies: 0.862≤(f7+f8) / (CP7+EP78+CP8)≤1.900, where f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, CP7 is the maximum thickness of the seventh spacer along the optical axis, CP8 is the maximum thickness of the eighth spacer along the optical axis, and EP78 is the spacing between the seventh and eighth spacers along the optical axis.

10. The optical lens according to any one of claims 1 to 3, characterized in that, The plurality of spacers also include: A third spacer is positioned between the third lens and the fourth lens and contacts the image-side surface of the third lens; and The fourth spacer is placed between the fourth lens and the fifth lens and is in contact with the image side of the fourth lens; The optical lens satisfies the following conditions: -15.391≤f3 / (D3s-d3s)≤-7.935 and 7.801≤f4 / (D4s-d4s)≤9.534, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object-side surface of the third spacer, D3s is the outer diameter of the object-side surface of the third spacer, f4 is the effective focal length of the fourth lens, d4s is the inner diameter of the object-side surface of the fourth spacer, and D4s is the outer diameter of the object-side surface of the fourth spacer.

11. The optical lens according to any one of claims 1 to 7, characterized in that, The plurality of spacers also include: A fifth spacer is positioned between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens; and The sixth spacer is placed between the sixth lens and the seventh lens and is in contact with the image side of the sixth lens; The optical lens satisfies the following conditions: 1.133≤N5 / N6≤1.140 and -3.555≤(R10 / D5m)×(R12 / D6m)≤-0.977, where N5 is the refractive index of the fifth lens, N6 is the refractive index of the sixth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, R12 is the radius of curvature of the image-side surface of the sixth lens, D5m is the outer diameter of the image-side surface of the fifth spacer, and D6m is the outer diameter of the image-side surface of the sixth spacer.

12. The optical lens according to any one of claims 1 to 8, characterized in that, The optical lens satisfies: 0.029≤|CT6×V6 / f6|≤1.573, where CT6 is the center thickness of the sixth lens on the optical axis, V6 is the Abbe number of the sixth lens, and f6 is the effective focal length of the sixth lens.

13. The optical lens according to any one of claims 1 to 3, characterized in that, The plurality of spacers also include: A second spacer is positioned between the second lens and the third lens and contacts the image-side surface of the second lens; and The third spacer is placed between the third lens and the fourth lens and is in contact with the image side of the third lens; The optical lens satisfies: 25.586≤EP23 / CP3≤27.741 and 0.143≤|CT4 / R7|≤0.165, where EP23 is the spacing between the second spacer and the third spacer along the optical axis, CP3 is the maximum thickness of the third spacer along the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and R7 is the radius of curvature of the object side surface of the fourth lens.

14. The optical lens according to any one of claims 1 to 7, characterized in that, The plurality of spacers also include: A fifth spacer is positioned between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens; and The sixth spacer is placed between the sixth lens and the seventh lens and is in contact with the image side of the sixth lens; The optical lens satisfies the following conditions: -0.307≤D6s / R11≤0.303 and 0.969≤V6×CP5 / CT6≤1.073, where D6s is the outer diameter of the object side of the sixth spacer, R11 is the radius of curvature of the object side of the sixth lens, V6 is the Abbe number of the sixth lens, CP5 is the maximum thickness of the fifth spacer along the optical axis, and CT6 is the center thickness of the sixth lens along the optical axis.

Images