Optical lens and camera

Abstract

The application discloses an optical lens and a camera, and relates to the technical field of optical systems, wherein the optical lens has an object side and an image side oppositely arranged along the optical axis direction, and the optical lens comprises a diaphragm, a first lens to an eighth lens arranged in sequence from the object side to the image side; the first lens, the third lens, the fourth lens, the sixth lens and the seventh lens have positive refractive powers; the second lens, the fifth lens and the eighth lens have negative refractive powers; wherein the passing aperture of the diaphragm is adjustable, so that the aperture value of the optical lens is adjustable in the range greater than or equal to 1.8 and less than or equal to 4.0; the total optical length of the optical lens is TTL, TTL is less than or equal to 11 mm, and the imaging quality of the optical lens is greater than or equal to 50 million pixels. The technical scheme provided by the application realizes small size, large-aperture light entering and small-aperture depth-of-field control by adopting an adjustable diaphragm and an eight-lens structure, and supports high resolution of more than 50 million pixels through reasonable distribution of positive and negative refractive powers.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to an optical lens and a camera. Background Technology

[0002] With the continuous development of portable electronic devices, major manufacturers have increasingly higher requirements for the size and performance of the optical imaging lenses used in them. For example, in the camera systems of mobile devices such as drones, mobile phones, and action cameras, in order to meet the application requirements of small space while taking into account excellent optical performance such as high image quality, it is usually necessary to constrain the local size and individual lens parameters, which makes it difficult to make the lens aperture large and mostly fixed aperture, resulting in poor manufacturability and low manufacturing yield.

[0003] Therefore, there is a need for an optical lens that can meet the requirements of small size and high resolution when setting an adjustable aperture, in order to meet the needs of electronic device development and user experience. Summary of the Invention

[0004] The main objective of this invention is to provide an optical lens and a camera, which aims to provide an optical lens with an adjustable aperture that meets the requirements of small size and high pixel count.

[0005] To achieve the above objectives, the present invention proposes an optical lens having an object side and an image side arranged opposite to each other along the optical axis. The optical lens includes an aperture stop, 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 arranged sequentially from the object side to the image side. The first, third, fourth, sixth, and seventh lenses have positive optical power; the second, fifth, and eighth lenses have negative optical power. The aperture stop is adjustable, allowing the aperture value of the optical lens to be adjustable within a range greater than or equal to 1.8 and less than or equal to 4.0. The total optical length of the optical lens is TTL, where TTL ≤ 11 mm, and the imaging quality of the optical lens is greater than or equal to 50 megapixels.

[0006] In one embodiment, the object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is concave. The object-side surface of the third lens is convex, and the image-side surface is concave. The object-side surface of the fourth lens is concave, and the image-side surface is convex. The object-side surface of the fifth lens is concave, and the image-side surface is convex. The object-side surface of the sixth lens is concave, and the image-side surface is convex. The object-side surface of the seventh lens is concave, and the image-side surface is convex. The object-side surface of the eighth lens is concave, and the image-side surface is convex.

[0007] In one embodiment, the first lens is configured as a glass aspherical lens; The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are configured as plastic aspherical lenses.

[0008] In one embodiment, the effective focal length of the optical lens is EFL, and the optical lens satisfies TTL / EFL≤1.3.

[0009] In one embodiment, the optical lens further includes: A photosensitive chip is disposed on the image side of the eighth lens; A filter is disposed between the eighth lens and the photosensitive chip.

[0010] In one embodiment, the diameter D1 of the first lens satisfies: D1≤6mm; The image plane diameter of the optical lens is IC, which satisfies the condition: IC ≤ 16.4 mm.

[0011] In one embodiment, the focal length of the first lens is f1, where 9mm ≤ f1 ≤ 16mm; The focal length of the second lens is f2, -30mm≤f2≤-18mm; The focal length of the third lens is f3, 10mm≤f3≤20mm; The focal length of the fourth lens is f4, 15mm≤f4≤30mm; The focal length of the fifth lens is f5, -18mm≤f5≤-9mm; The focal length of the sixth lens is f6, where 20mm ≤ f6 ≤ 35mm; The focal length of the seventh lens is f7, 45mm≤f7≤65mm; The focal length of the eighth lens is f8, -15mm≤f8≤-8mm.

[0012] In one embodiment, the refractive index of the first lens is n1, where 1.60 ≤ n1 ≤ 1.85; The refractive index of the second lens is n2, where 1.60 ≤ n2 ≤ 1.70; The refractive index of the third lens is n3, where 1.50 ≤ n3 ≤ 1.60; The refractive index of the fourth lens is n4, where 1.50 ≤ n4 ≤ 1.60; The refractive index of the fifth lens is n5, where 1.60 ≤ n5 ≤ 1.70; The refractive index of the sixth lens is n6, where 1.50 ≤ n6 ≤ 1.60; The refractive index of the seventh lens is n7, where 1.60 ≤ n7 ≤ 1.70; The refractive index of the eighth lens is n8, where 1.50 ≤ n8 ≤ 1.60.

[0013] In one embodiment, the dispersion coefficient of the first lens is v1, where 50.0 ≤ v1 ≤ 95.0; The dispersion coefficient of the second lens is v2, 18.0≤v2≤26.0; The dispersion coefficient of the third lens is v3, 50.0≤v3≤65.0; The dispersion coefficient of the fourth lens is v4, 50.0≤v4≤65.0; The dispersion coefficient of the fifth lens is v5, 18.0≤v5≤26.0; The dispersion coefficient of the sixth lens is v6, 50.0≤v6≤65.0; The dispersion coefficient of the seventh lens is v7, 18.0≤v7≤26.0; The dispersion coefficient of the eighth lens is v8, where 50.0 ≤ v8 ≤ 65.0.

[0014] The present invention also proposes a camera, the camera including an optical lens, wherein the optical lens has an object side and an image side arranged opposite to each other along the optical axis, the optical lens including an aperture stop, 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 arranged sequentially from the object side to the image side; the first lens, the third lens, the fourth lens, the sixth lens, and the seventh lens have positive optical power; the second lens, the fifth lens, and the eighth lens have negative optical power; wherein the aperture of the aperture stop is adjustable so that the aperture value of the optical lens is adjustable within the range of greater than or equal to 1.8 and less than or equal to 4.0, the total optical length of the optical lens is TTL, TTL≤11mm, and the imaging quality of the optical lens is greater than or equal to 50 megapixels.

[0015] The technical solution of this invention achieves a small size while taking into account both large aperture light intake and small aperture depth of field control by using an adjustable aperture combined with an eight-lens structure. Through reasonable allocation of positive and negative optical power, it supports high resolution of 50 million pixels and above. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the optical lens provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the spherical aberration curve of a medium optical lens; Figure 3 for Figure 1 A schematic diagram of the transverse chromatic aberration curve of a medium optical lens; Figure 4 for Figure 1 A schematic diagram of the light aberration curve of a medium optical lens; Figure 5 for Figure 1 A schematic diagram of field curvature distortion in a medium-sized optical lens; Figure 6 for Figure 1 MTF chart of a medium-temperature optical lens at 20℃; Figure 7 for Figure 1 Through focus diagram of a medium-temperature optical lens at 20°C; Figure 8 for Figure 1 Through focus diagram of a medium-sized optical lens at -20℃; Figure 9 for Figure 1 Through focus diagram corresponding to 60° for a medium optical lens.

[0018] Explanation of icon numbers: 100. Optical lens; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Eighth lens; 9. Aperture stop; 10. Photosensitive chip; 11. Filter.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] With the continuous development of portable electronic devices, manufacturers are placing increasingly higher demands on the size and performance of the optical imaging lenses used in these devices. For example, in camera systems of mobile devices such as drones, mobile phones, and action cameras, to meet the application requirements of small spaces while also maintaining excellent optical performance such as high image quality, it is often necessary to constrain local dimensions and individual lens parameters. This typically results in limited aperture size, often leading to fixed apertures, poor manufacturability, and low manufacturing yield. Therefore, there is a need for an optical lens that can meet the requirements of small size and high pixel count while incorporating an adjustable aperture, in order to satisfy the development of electronic devices and the user experience needs.

[0024] This invention proposes an optical lens.

[0025] Please see Figure 1In one embodiment of the present invention, the optical lens 100 has an object side and an image side arranged opposite to each other along the optical axis. The optical lens 100 includes an aperture stop 9, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8 arranged sequentially from the object side to the image side. The optical powers of the first lens 1, the third lens 3, the fourth lens 4, the sixth lens 6, and the seventh lens 7 are positive; the optical powers of the second lens 2, the fifth lens 5, and the eighth lens 8 are negative. The aperture of the aperture stop 9 is adjustable so that the aperture value of the optical lens 100 is adjustable within the range of greater than or equal to 1.8 and less than or equal to 4.0. The total optical length of the optical lens 100 is TTL, where TTL ≤ 11 mm, and the imaging quality of the optical lens 100 is greater than or equal to 50 million pixels.

[0026] In the technical solution of the present invention, the aperture stop 9 is set on the object side of the first lens 1 and is located at the foremost position. It can adjust the amount of light entering the lens to adapt to different ambient brightness; adjust the aperture value to achieve depth of field control; cut off off-axis stray light and suppress glare; improve off-axis aberration and enhance the imaging quality of the entire field of view. The first lens 1 bears the main positive optical power of the optical lens 100, performs initial convergence of incident light rays, and shares the optical power pressure with subsequent lenses; it also performs initial correction of primary spherical aberration and suppresses on-axis aberration in the central region under large aperture. The second lens 2 diffuses some light rays, alleviating the excessive concentration of the front group's optical focal length and preventing a sharp deterioration of spherical aberration and coma at large apertures; it also adjusts the incident angle of the principal ray, improving the initial distribution of field curvature and astigmatism. The third lens 3 focuses on correcting coma and minor spherical aberration, improving the center sharpness of the off-axis field of view; The fourth lens 4 bears the key positive optical power of the system and is an important lens for achieving high relative aperture (large aperture). It focuses on correcting astigmatism and field curvature, and improving the resolution at the edge of the large field of view; it further optimizes on-axis chromatic aberration, and provides the foundation for 50-megapixel high resolution; The fifth lens 5, together with the fourth and sixth lenses 6, forms a positive-negative-positive combination, which effectively corrects chromatic aberration and higher-order spherical aberration; it also adjusts the beam convergence speed to avoid overburdening the rear lens group, which is beneficial for compressing TTL. The sixth lens 6 continues to converge the beam, ensuring the system's effective focal length and aperture range (F1.8~4.0); it also finely corrects residual spherical aberration and coma, improving high-frequency detail resolution in the center field of view. The seventh lens 7 undertakes the final stage of main positive optical power, completing the final convergent imaging; it focuses on correcting astigmatism and distortion across the entire field of view, ensuring that the edge image quality does not collapse or deform; it optimizes off-axis aberration, so that the edge field of view can also reach the high MTF level required for 50 million pixels; The eighth lens 8 finally corrects residual field curvature and astigmatism, achieving a near-flat field imaging effect.

[0027] It adopts a front-mounted adjustable aperture 9 combined with an eight-element lens structure, which balances large aperture light intake and small aperture depth of field control, making it highly adaptable to different scenes. Its simple structure and small size keep the total optical length within 11mm. The overall structure is compact and easy to integrate into thin and light electronic products such as mobile phones and wearable devices. The positive and negative optical power are reasonably distributed to effectively correct spherical aberration, coma, astigmatism, field curvature and chromatic aberration, and support high resolution of 50 million pixels and above.

[0028] For the specific shapes of each lens, please refer to [reference needed]. Figure 1 Specifically: the object-side surface of the first lens 1 is convex, and the image-side surface is concave; the object-side surface of the second lens 2 is convex, and the image-side surface is concave; the object-side surface of the third lens 3 is convex, and the image-side surface is concave; the object-side surface of the fourth lens 4 is concave, and the image-side surface is convex; the object-side surface of the fifth lens 5 is concave, and the image-side surface is convex; the object-side surface of the sixth lens 6 is concave, and the image-side surface is convex; the object-side surface of the seventh lens 7 is concave, and the image-side surface is convex; and the object-side surface of the eighth lens 8 is concave, and the image-side surface is convex.

[0029] Regarding the materials of each lens, the first lens 1 is set as a glass aspherical lens. Glass material has excellent refractive index stability, high temperature resistance, and optical uniformity, which can effectively reduce the impact of temperature changes on image quality, avoid light refraction deviation, and ensure the stability of 50-megapixel high resolution. At the same time, the strong wear resistance of glass material can improve the reliability of the lens for long-term use and adapt to the complex operating environment of electronic devices. The second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are set as plastic aspherical lenses. Plastic material has low density and light weight, which can significantly reduce the overall weight of the lens and meet the lightweight requirements of small electronic devices. At the same time, plastic material is easy to mass-produce through injection molding, with high molding precision, which can effectively control production costs and meet the requirements of large-scale mass production. Moreover, injection molding can accurately achieve aspherical surface shape without the need for subsequent complex grinding processing.

[0030] While ensuring that the effective focal length (EFL) meets the imaging field of view requirements, by controlling the ratio of total optical length (TTL) to effective focal length (EFL) to be ≤1.3, the axial dimension of the system can be further compressed, ensuring that the compact requirement of TTL≤11mm is stably achieved, adapting to the installation space of thin and light electronic devices, and conforming to the development trend of small electronic devices.

[0031] In one specific embodiment, the optical lens 100 further includes a photosensitive chip 10 and a filter 11. The photosensitive chip 10 is disposed on the image side of the eighth lens 8; the filter 11 is disposed between the eighth lens 8 and the photosensitive chip 10. The photosensitive chip 10, as the core imaging component of the lens, has the core function of receiving the optical light rays that are finally converged by the eighth lens 8 and performing photoelectric conversion on them, that is, converting the invisible optical signal into a processable electrical signal, and then outputting a high-definition digital image through subsequent signal processing. The filter 11 is positioned between the eighth lens 8 and the image sensor 10, and its main functions are to filter light, protect the image sensor, and improve image quality. First, it filters infrared light, stray light, and harmful light from the incident light, avoiding color distortion caused by infrared light, reducing stray light interference with the photoelectric conversion process of the image sensor 10, reducing image noise, and ensuring the accuracy and clarity of the image color to meet the imaging requirements of 50 million pixels. Second, it protects the image sensor 10, preventing strong light and harmful light from directly irradiating the image sensor 10, reducing chip wear, and improving the stability of the lens during long-term use. The diameter D1 of the first lens 1 satisfies: D1≤6mm. As the component closest to the object side of the lens, the diameter of the first lens 1 directly affects the overall radial dimension of the lens. Limiting D1≤6mm effectively compresses the radial volume of the lens, which, in conjunction with the axial dimension constraints of TTL≤11mm and TTL / EFL≤1.3, achieves overall lens miniaturization. The image plane diameter IC of the optical lens 100 satisfies: IC≤16.4mm. Adapting to miniaturization design and compressing the overall lens volume: The image plane diameter directly determines the size of the photosensitive chip 10. Limiting IC≤16.4mm allows for the matching of a small, high-pixel photosensitive chip 10, avoiding an increase in the size of the photosensitive chip 10 due to an excessively large image plane, thereby avoiding redundancy in the radial and axial volume of the lens. This, in conjunction with the constraints of TTL≤11mm, TTL / EFL≤1.3, and D1≤6mm, further optimizes the overall compactness of the lens.

[0032] The specific parameters for each lens are as follows: The focal length of the first lens 1 is f1, 9mm≤f1≤16mm; the focal length of the second lens 2 is f2, -30mm≤f2≤-18mm; the focal length of the third lens 3 is f3, 10mm≤f3≤20mm; the focal length of the fourth lens 4 is f4, 15mm≤f4≤30mm; the focal length of the fifth lens 5 is f5, -18mm≤f5≤-9mm; the focal length of the sixth lens 6 is f6, 20mm≤f6≤35mm; the focal length of the seventh lens 7 is f7, 45mm≤f7≤65mm; and the focal length of the eighth lens 8 is f8, -15mm≤f8≤-8mm.

[0033] The refractive index of the first lens 1 is n1, 1.60≤n1≤1.85; the refractive index of the second lens 2 is n2, 1.60≤n2≤1.70; the refractive index of the third lens 3 is n3, 1.50≤n3≤1.60; the refractive index of the fourth lens 4 is n4, 1.50≤n4≤1.60; the refractive index of the fifth lens 5 is n5, 1.60≤n5≤1.70; the refractive index of the sixth lens 6 is n6, 1.50≤n6≤1.60; the refractive index of the seventh lens 7 is n7, 1.60≤n7≤1.70; and the refractive index of the eighth lens 8 is n8, 1.50≤n8≤1.60.

[0034] The dispersion coefficient of the first lens 1 is v1, 50.0≤v1≤95.0; the dispersion coefficient of the second lens 2 is v2, 18.0≤v2≤26.0; the dispersion coefficient of the third lens 3 is v3, 50.0≤v3≤65.0; the dispersion coefficient of the fourth lens 4 is v4, 50.0≤v4≤65.0; the dispersion coefficient of the fifth lens 5 is v5, 18.0≤v5≤26.0; the dispersion coefficient of the sixth lens 6 is v6, 50.0≤v6≤65.0; the dispersion coefficient of the seventh lens 7 is v7, 18.0≤v7≤26.0; and the dispersion coefficient of the eighth lens 8 is v8, 50.0≤v8≤65.0.

[0035] In one specific embodiment: the optical lens 100 has a focal length f = 8.949 mm, an aperture value F = 1.829, an image plane diameter of 16.4 m, and a diagonal field of view of 84°.

[0036] Table 1: Specific parameters of each lens:

[0037] Table 2: Conicity and Asphericity of Aspherical Lenses The surface profile of an aspherical lens satisfies the formula:

[0038] Where z represents the axial sagitta in the Z direction of the aspherical surface; y represents the height of the aspherical surface; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the conic coefficient; and the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms represent higher-order aspherical coefficients, respectively.

[0039]

[0040] The present invention also proposes a camera, which includes an optical lens 100. The specific structure of the optical lens 100 is as described in the above embodiments. Since the camera adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The optical lens 100 has an object side and an image side arranged opposite each other along the optical axis. The optical lens 100 includes an aperture stop 9, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8 arranged sequentially from the object side to the image side. The first lens 1, the third lens 3, the fourth lens 4, the sixth lens 6, and the seventh lens 7 have positive optical power; the second lens 2, the fifth lens 5, and the eighth lens 8 have negative optical power. The aperture of the aperture stop 9 is adjustable, so that the aperture value of the optical lens 100 is adjustable within the range of greater than or equal to 1.8 and less than or equal to 4.0. The total optical length of the optical lens 100 is TTL, where TTL ≤ 11 mm, and the imaging quality of the optical lens 100 is greater than or equal to 50 million pixels.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens has an object side and an image side that are arranged opposite to each other along the optical axis. The optical lens includes an aperture stop, 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 arranged sequentially from the object side to the image side. The first lens, the third lens, the fourth lens, the sixth lens, and the seventh lens have positive optical power; the second lens, the fifth lens, and the eighth lens have negative optical power. The aperture of the stop is adjustable so that the aperture value of the optical lens is adjustable within the range of greater than or equal to 1.8 and less than or equal to 4.

0. The total optical length of the optical lens is TTL, TTL≤11mm, and the imaging quality of the optical lens is greater than or equal to 50 million pixels.

2. The optical lens as described in claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is concave. The object-side surface of the third lens is convex, and the image-side surface is concave. The object-side surface of the fourth lens is concave, and the image-side surface is convex. The object-side surface of the fifth lens is concave, and the image-side surface is convex. The object-side surface of the sixth lens is concave, and the image-side surface is convex. The object-side surface of the seventh lens is concave, and the image-side surface is convex. The object-side surface of the eighth lens is concave, and the image-side surface is convex.

3. The optical lens as described in claim 2, characterized in that, The first lens is configured as a glass aspherical lens; The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are configured as plastic aspherical lenses.

4. The optical lens as described in claim 1, characterized in that, The effective focal length of the optical lens is EFL, and the optical lens satisfies TTL / EFL≤1.

3.

5. The optical lens as described in claim 1, characterized in that, The optical lens also includes: A photosensitive chip is disposed on the image side of the eighth lens; A filter is disposed between the eighth lens and the photosensitive chip.

6. The optical lens as described in claim 1, characterized in that, The diameter D1 of the first lens satisfies: D1≤6mm; The image plane diameter of the optical lens is IC, which satisfies the condition: IC ≤ 16.4 mm.

7. The optical lens as described in claim 1, characterized in that, The focal length of the first lens is f1, where 9mm ≤ f1 ≤ 16mm; The focal length of the second lens is f2, -30mm≤f2≤-18mm; The focal length of the third lens is f3, 10mm≤f3≤20mm; The focal length of the fourth lens is f4, 15mm≤f4≤30mm; The focal length of the fifth lens is f5, -18mm≤f5≤-9mm; The focal length of the sixth lens is f6, where 20mm ≤ f6 ≤ 35mm; The focal length of the seventh lens is f7, 45mm≤f7≤65mm; The focal length of the eighth lens is f8, -15mm≤f8≤-8mm.

8. The optical lens as described in claim 1, characterized in that, The refractive index of the first lens is n1, where 1.60 ≤ n1 ≤ 1.85; The refractive index of the second lens is n2, where 1.60 ≤ n2 ≤ 1.70; The refractive index of the third lens is n3, where 1.50 ≤ n3 ≤ 1.60; The refractive index of the fourth lens is n4, where 1.50 ≤ n4 ≤ 1.60; The refractive index of the fifth lens is n5, where 1.60 ≤ n5 ≤ 1.70; The refractive index of the sixth lens is n6, where 1.50 ≤ n6 ≤ 1.60; The refractive index of the seventh lens is n7, where 1.60 ≤ n7 ≤ 1.70; The refractive index of the eighth lens is n8, where 1.50 ≤ n8 ≤ 1.

60.

9. The optical lens as described in claim 1, characterized in that, The dispersion coefficient of the first lens is v1, 50.0≤v1≤95.0; The dispersion coefficient of the second lens is v2, 18.0≤v2≤26.0; The dispersion coefficient of the third lens is v3, 50.0≤v3≤65.0; The dispersion coefficient of the fourth lens is v4, 50.0≤v4≤65.0; The dispersion coefficient of the fifth lens is v5, 18.0≤v5≤26.0; The dispersion coefficient of the sixth lens is v6, 50.0≤v6≤65.0; The dispersion coefficient of the seventh lens is v7, 18.0≤v7≤26.0; The dispersion coefficient of the eighth lens is v8, where 50.0 ≤ v8 ≤ 65.

0.

10. A camera, characterized in that, Includes the optical lens as described in any one of claims 1 to 9.

Images