An optical lens

Abstract

This invention discloses an optical lens comprising ten lenses arranged sequentially along the optical axis from the object plane to the image plane. The first lens is a glass spherical lens with negative optical power; the second lens is a plastic aspherical lens with negative optical power; the third lens is a plastic aspherical lens with positive optical power; the fourth lens is a plastic aspherical lens with negative optical power; the fifth lens is a glass spherical lens with positive optical power; the sixth lens is a glass spherical lens with positive optical power; the seventh lens is a glass spherical lens with negative optical power; the eighth lens is a glass spherical lens with positive optical power; the ninth lens is a plastic aspherical lens with negative optical power; and the tenth lens is a plastic aspherical lens with positive optical power. Through this arrangement, and by rationally combining the optical power, position, shape, and material of each lens, a confocal infrared optical lens with ultra-large light transmission, a large target area, and an ultra-wide angle is designed.

Description

Technical Field

[0001] The present invention relates to the field of optical device technology, and in particular to an optical lens. Background Technology

[0002] In the digital age, security and public safety work is booming, leading to a surge in demand for surveillance equipment. Compared to zoom lenses, fixed-focus lenses are simpler to design and manufacture, producing clear, stable, and detailed images of moving objects, making them essential in the security monitoring industry. Within the security monitoring lens field, with technological advancements, ultra-wide-angle fixed-focus lenses have gained widespread application due to their high image quality and ability to capture wide-angle shots outdoors.

[0003] Currently, the mainstream fixed-focus large-aperture lenses on the market typically have parameters close to F1.0, are equipped with a 1 / 2.7-inch sensor, and have a large lens size. At night, they need to use supplemental lighting or switch between filters of different thicknesses to ensure the image quality of the lens at night. They still have problems such as insufficient target size, insufficient field of view, insufficient size, and poor filter versatility. Summary of the Invention

[0004] This invention provides an optical lens composed of 5 glass and 5 plastic lenses, achieving an aperture of f / 1.0, a total optical length of no more than 22.5 mm, an imaging target surface that can be matched with a 1 / 2.5-inch chip, and a field of view close to 160°, thus meeting the market demand for infrared confocal optical lenses.

[0005] This invention provides an optical lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture stop, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object plane to the image plane;

[0006] The first lens is a glass spherical lens with negative optical power; the second lens is a plastic aspherical lens with negative optical power; the third lens is a plastic aspherical lens with positive optical power; the fourth lens is a plastic aspherical lens with negative optical power; the fifth lens is a glass spherical lens with positive optical power; the sixth lens is a glass spherical lens with positive optical power; the seventh lens is a glass spherical lens with negative optical power; the eighth lens is a glass spherical lens with positive optical power; the ninth lens is a plastic aspherical lens with negative optical power; and the tenth lens is a plastic aspherical lens with positive optical power.

[0007] Optionally, along the optical axis from the object plane to the image plane, the surface of the lens facing the object plane is called the object-side surface, and the surface of the lens closer to the image plane is called the image-side surface.

[0008] The first lens has a convex object-side surface and a concave image-side surface; the second lens has a concave object-side surface and a convex image-side surface; the third lens has a convex image-side surface; the fourth lens has a concave object-side surface and a convex image-side surface; the fifth lens has a convex image-side surface; the sixth lens has a convex object-side surface and a convex image-side surface; the seventh lens has a concave object-side surface and a concave image-side surface; the eighth lens has a convex object-side surface and a convex image-side surface; the ninth lens has a concave image-side surface; and the tenth lens has a convex object-side surface and a convex image-side surface.

[0009] Optionally, the optical power of each lens satisfies the following formula:

[0010] -0.63≤Φ1 / Φ≤-0.48;-0.38≤Φ2 / Φ≤-0.20;

[0011] 0.29≤Φ3 / Φ≤0.44; -0.18≤Φ4 / Φ≤-0.01;

[0012] 0.19≤Φ5 / Φ≤0.45; -0.38≤Φ9 / Φ≤-0.08;

[0013] 0.32≤Φ10 / Φ≤0.43;

[0014] Wherein, Φ1, Φ2, Φ3, Φ4, Φ5, Φ9, and Φ10 represent the optical power of the first lens to the fifth lens, the ninth lens, and the tenth lens, respectively, and Φ represents the overall optical power of the optical lens.

[0015] Optionally, the sixth lens, the seventh lens, and the eighth lens are cemented together to form a cemented lens group.

[0016] Optionally, the total optical power of the three-cement lens group satisfies the following formula: 0.05≤Φ678 / Φ≤0.28;

[0017] Wherein, Φ678 represent the total optical power of the three-cement lens group composed of the sixth lens, the seventh lens and the eighth lens, respectively, and Φ represents the overall optical power of the optical lens.

[0018] Optionally, the refractive index and Abbe number of each lens satisfy the following conditional formula:

[0019] 1.8 <Nd1,21.1<Vd1<44;1.51<Nd2<1.64,19.1<Vd2<60;

[0020] 19.1 <Vd4<60;1.8<Nd5,17.1<Vd5<38.3;

[0021] 1.48 <Nd6<1.67,65.3<Vd6<88.3;1.49<Nd8<1.62,63<Vd8<98;

[0022] 1.6 <Nd9<1.7,19.1<Vd9<30;

[0023] Wherein, Nd1, Nd2, Nd5, Nd6, Nd8, and Nd9 represent the refractive indices of the first lens, the second lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens, respectively, and Vd1, Vd2, Vd4, Vd5, Vd6, Vd8, and Vd9 represent the Abbe numbers of the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens, respectively.

[0024] Optionally, the entrance pupil diameter ENPD of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: ENPD / TTL≥0.12.

[0025] Optionally, the central radius of curvature R1 of the first lens object side surface and the effective focal length EFFL of the optical lens satisfy the following:

[0026] 3.0 < R1 / EFFL < 5.2.

[0027] Optionally, the optical back focal length (BFL) of the optical lens and the optical total length (TTL) of the optical lens satisfy the following condition: 0.186 ≤ BFL / TTL ≤ 0.202.

[0028] Optionally, a filter may also be included, which is located between the tenth lens and the image plane.

[0029] The optical lens provided in this embodiment of the invention includes 10 lenses arranged sequentially from the object plane to the image plane along the optical axis. The optical power of the first lens to the tenth lens is negative-negative-positive-negative-positive-positive-negative-positive-positive-negative-positive. By setting the above, the optical power, position, shape and material of each lens are reasonably matched, and the design of an infrared confocal optical lens with ultra-large light transmission, large target area and ultra-wide angle is realized. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of this application;

[0031] Figure 2 An axial aberration curve of an optical lens provided in Embodiment 1 of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of this application;

[0033] Figure 4 An axial aberration curve of the optical lens provided in Embodiment 2 of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the optical lens provided in Embodiment 3 of this application;

[0035] Figure 6 An axial aberration curve of the optical lens provided in Embodiment 3 of this application;

[0036] Figure 7 This is a schematic diagram of the structure of the optical lens provided in Embodiment 4 of this application;

[0037] Figure 8 This is an axial aberration curve of the optical lens provided in Embodiment 4 of this application. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] Figure 1 This is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of this application, with reference to... Figure 1 An optical lens provided in this embodiment of the invention includes a lens extending from the object plane along the optical axis ( Figure 1 The lenses arranged sequentially from the image plane IMA are: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, aperture STO, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, and tenth lens L10.

[0040] The first lens L1 is a glass spherical lens with negative optical power; the second lens L2 is a plastic aspherical lens with negative optical power; the third lens L3 is a plastic aspherical lens with positive optical power; the fourth lens L4 is a plastic aspherical lens with negative optical power; the fifth lens L5 is a glass spherical lens with positive optical power; the sixth lens L6 is a glass spherical lens with positive optical power; the seventh lens L7 is a glass spherical lens with negative optical power; the eighth lens L8 is a glass spherical lens with positive optical power; the ninth lens L9 is a plastic aspherical lens with negative optical power; and the tenth lens L10 is a plastic aspherical lens with positive optical power.

[0041] refer to Figure 1In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 can be arranged sequentially along the optical axis from the object plane to the image plane in a single lens barrel. Figure 1 (Not shown in the image). It should be noted that... Figure 1 The structural diagrams in the subsequent embodiments are for illustrative purposes only, and shapes such as aspherical surfaces are not represented in accordance with actual conditions.

[0042] Optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, and its value is the reciprocal of the focal length. It characterizes the ability of an optical lens to deflect light. The larger the absolute value of optical power, the stronger the bending ability of light; the smaller the absolute value of optical power, the weaker the bending ability of light. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a lens group formed by multiple lenses.

[0043] refer to Figure 1 The first lens L1 and the second lens L2, with negative optical power, diverge the incident light, which can increase the entrance pupil of the light. The third lens L3, with positive optical power, converges the light. The fourth lens L4, with negative optical power, diverges the light again. The fifth lens L5 and the sixth lens L6, with positive optical power, converge the light again. The seventh lens L7, with negative optical power, diverges the light again. The eighth lens L8, with positive optical power, converges the light again. The ninth lens L9, with negative optical power, diverges the light again. Finally, the tenth lens L10, with positive optical power, converges the light and forms an image on the image plane IMA. By reasonably combining the optical power of the first lens L1 to the tenth lens L10, it is beneficial to realize the design of an infrared confocal optical lens with ultra-large light transmission, large target area, and ultra-wide angle.

[0044] In this embodiment, the aperture stop STO can be positioned between a fifth lens with positive optical power and a sixth lens with positive optical power. The aperture stop STO, positioned between the fifth lens L5 and the sixth lens L6 with positive optical power, restricts the beam or field of view in the optical lens by adjusting the propagation direction of the light beam emitted from the fifth lens L5 to the incident surface of the sixth lens L6. Simultaneously, the fifth lens L5 at the front of the aperture stop STO converges the light, resulting in a larger light aperture before the light enters the aperture stop STO, increasing the aperture of the optical lens. This avoids stray light such as reflections at the aperture stop STO position and, to a certain extent, adjusts lens aberrations, ensuring aberration balance and stable high and low temperature performance, meeting the usage requirements under different conditions.

[0045] The rear end of the STO aperture uses a sixth lens (L6) with positive optical power to converge light along the optical axis, compressing the beam aperture and limiting the propagation angle and direction of the light, thereby adjusting the angle of incidence of the light entering the seventh lens (L7) with negative optical power. Furthermore, the eighth lens (L8) with positive optical power, the ninth lens (L9) with negative optical power, and the tenth lens (L10) with positive optical power are used in combination to converge, expand, and reconverge the expanded beam, correcting aberrations at the rear of the lens. This facilitates the formation of a clear image on the IMA image plane, stabilizes the image quality of the optical lens, and simultaneously helps meet the target surface requirements of the optical lens.

[0046] Among them, the aperture stop STO includes the aperture stop and the field stop. The aperture stop refers to the stop that restricts the beam the most, and the field stop refers to the stop that restricts the field of view (size) the most.

[0047] Considering that glass is more stable than plastic in high and low temperature environments, and that glass lenses have stronger light-reflecting capabilities, this application uses glass spherical lenses for the first lens L1, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. This helps reduce the number of lenses, decrease lens size, reduce focus drift caused by thermal effects, and improve the stability of fixed-focus lenses. Considering that aspherical lenses have excellent control over optical aberrations and higher-order optical aberrations, the second lens L2, third lens L3, fourth lens L4, ninth lens L9, and tenth lens L10 are all plastic aspherical lenses. This reduces lens costs while simultaneously controlling optical aberrations and higher-order optical aberrations.

[0048] This application, through its 5G5P (i.e., 5 glass lenses and 5 plastic lenses) configuration, enables the optical lens to maintain excellent resolution across a wide temperature range, meeting the application requirements of security and public safety fields. For example, it maintains good performance without focus shifting when exposed to ambient temperatures ranging from -40°C to 80°C.

[0049] It should be noted that the materials of the glass spherical lens and the plastic aspherical lens are various types of glass known to those skilled in the art, and this application embodiment will not elaborate on or limit them.

[0050] In this embodiment of the application, the plastic aspherical lens of the optical lens satisfies the following formula:

[0051]

[0052] Where z represents the axial sagitta in the Z direction of the aspherical surface; r represents the distance from a point on the aspherical surface to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the fitted conic coefficients; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0053] Optional, see reference Figure 1 Along the optical axis from the object plane to the image plane, the surface of the lens facing the object plane is called the object-side surface, and the surface of the lens closer to the image plane is called the image-side surface. The object-side surface of the first lens L1 is convex, and the image-side surface is concave; the object-side surface of the second lens L2 is concave, and the image-side surface is convex; the image-side surface of the third lens L3 is convex; the object-side surface of the fourth lens L4 is concave, and the image-side surface is convex; the image-side surface of the fifth lens L5 is convex; the object-side surface of the sixth lens L6 is convex, and the image-side surface is convex; the object-side surface of the seventh lens L7 is concave, and the image-side surface is concave; the object-side surface of the eighth lens L8 is convex, and the image-side surface is convex; the image-side surface of the ninth lens L9 is concave; and the object-side surface of the tenth lens L10 is convex, and the image-side surface is convex.

[0054] In this design, concave lenses diverge transmitted light, while convex lenses converge transmitted light. This application achieves clear imaging through the proper configuration of the surface shapes of the first lens L1 to the tenth lens L10.

[0055] Based on the above embodiments, refer to Figure 1 The optical power of the first lens L1 satisfies the following formula: -0.63≤Φ1 / Φ≤-0.48. Where Φ1 represents the optical power of the first lens L1, and Φ represents the overall optical power of the optical lens.

[0056] Specifically, the first lens L1 is a convex-concave glass spherical lens with negative optical power. The aforementioned optical power design ensures that the optical lens can transmit light at a large angle, achieving an ultra-wide-angle design.

[0057] Based on the above embodiments, refer to Figure 1 The optical power of the second lens L2 to the fourth lens L4 satisfies the following formula:

[0058] -0.38≤Φ2 / Φ≤-0.20;0.29≤Φ3 / Φ≤0.44;-0.18≤Φ4 / Φ≤-0.01;

[0059] Wherein, Φ2, Φ3, and Φ4 represent the optical power of the second lens L2, the third lens L3, and the fourth lens L4, respectively.

[0060] Specifically, the second lens L2 is a concave-convex plastic aspherical lens with negative optical power, the third lens L3 is a plastic aspherical lens with positive optical power, and the fourth lens L4 is a concave-convex plastic aspherical lens with negative optical power. When the optical powers of the second lens L2, the third lens L3, and the fourth lens L4 meet this range, it can not only effectively reduce the light deflection angle, but also facilitate the correction of aberrations, and at the same time, it is beneficial to realize a large target surface.

[0061] Based on the above embodiments, refer to Figure 1 The optical power of the fifth lens L5 satisfies the following formula: 0.19≤Φ5 / Φ≤0.45. Where Φ5 represents the optical power of the fifth lens L5.

[0062] Specifically, the fifth lens L5 is a glass spherical lens with positive optical power. When the optical power meets this range, it can effectively reduce the angle of light deflection and the effective diameter of the light rays in the lens, so as to meet the lens structure and achieve a large aperture.

[0063] Based on the above embodiments, refer to Figure 1 The sixth lens L6, the seventh lens L7, and the eighth lens L8 are cemented together to form a cemented triplet lens group. This effectively reduces the air gap between the sixth lens L6, the seventh lens L7, and the eighth lens L8, reduces the overall length of the optical lens, and also helps to eliminate chromatic aberration.

[0064] Optionally, the total optical power of the three-layer cemented lens group satisfies the following formula: 0.05≤Φ678 / Φ≤0.28. Wherein, Φ678 represents the total optical power of the three-layer cemented lens group composed of the sixth lens L6, the seventh lens L7, and the eighth lens L8, and Φ represents the overall optical power of the optical lens.

[0065] Specifically, the sixth lens L6 is a biconvex glass spherical lens with positive optical power, the seventh lens L7 is a biconcave glass spherical lens with negative optical power, and the eighth lens L8 is a biconvex glass spherical lens with positive optical power. When the optical power of the three-layer cemented lens group composed of the sixth lens L6, the seventh lens L7, and the eighth lens L8 meets this range, it is beneficial for the normal use of the lens in high and low temperature environments.

[0066] Based on the above embodiments, refer to Figure 1 The optical power of the ninth lens L9 and the tenth lens L10 satisfies the following formula:

[0067] -0.38≤Φ9 / Φ≤-0.08;0.32≤Φ10 / Φ≤0.43;

[0068] Wherein, Φ9 and Φ10 represent the optical power of the ninth lens L9 and the tenth lens L10, respectively.

[0069] Specifically, the ninth lens L9 is a plastic aspherical lens with negative optical power, and the tenth lens L10 is a biconvex plastic aspherical lens with positive optical power. When the optical powers of the ninth lens L9 and the tenth lens L10 meet this range, it is beneficial to correct aberrations, thereby promoting the improvement of image quality.

[0070] In summary, by reasonably matching the optical power of the first lens L1 to the tenth lens L10, this application can correct the aberrations of the entire lens, form a clear image on the image plane IMA, and stabilize the imaging quality of the optical lens.

[0071] Refractive index is the ratio of the speed of light in a vacuum to the speed of light in a medium. It is mainly used to describe a material's ability to refract light. Different materials have different refractive indices; the higher the refractive index, the slower the light travels in that material. The Abbe number is an index used to represent the dispersion ability of a transparent medium; it can also be called the dispersion coefficient. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion, the larger the Abbe number. Generally speaking, refractive index and Abbe number are inversely proportional. This means that materials with higher refractive indices tend to have lower Abbe numbers, and vice versa.

[0072] Based on the above embodiments, refer to Figure 1 The refractive indices and Abbe numbers of the first lens L1 and the fifth lens L5 satisfy the following formula:

[0073] 1.8 <Nd1,21.1<Vd1<44;1.8<Nd5,17.1<Vd5<38.3。

[0074] Wherein, Nd1 and Nd5 represent the refractive indices of the first lens L1 and the fifth lens L5, respectively, and Vd1 and Vd5 represent the Abbe numbers of the first lens L1 and the fifth lens L5, respectively.

[0075] Specifically, when the refractive index and Abbe number of the first lens L1 and the fifth lens L5 are within this range, it can be ensured that the optical lens can transmit light at a large angle, and the lens aperture meets the structural assembly requirements, while also helping to reduce the overall length and volume of the lens.

[0076] Based on the above embodiments, refer to Figure 1 The refractive indices and Abbe numbers of the second lens L2 and the ninth lens L9 satisfy the following formula:

[0077] 1.51 <Nd2<1.64,19.1<Vd2<60;19.1<Vd4<60;

[0078] 1.6 <Nd9<1.7,19.1<Vd9<30。

[0079] Wherein, Nd2 and Nd9 represent the refractive indices of the second lens L2 and the ninth lens L9, respectively, and Vd2, Vd4, and Vd9 represent the Abbe numbers of the second lens L2, the fourth lens L4, and the ninth lens L9, respectively.

[0080] Specifically, when the refractive index and Abbe number of the second lens L2, the fourth lens L4 and the ninth lens L9 are within this range, the matching of the optical lens material 5G5P can be guaranteed, thereby ensuring chromatic aberration and smooth light transition, thus ensuring assembly tolerance.

[0081] Based on the above embodiments, refer to Figure 1 The refractive indices and Abbe numbers of the sixth lens L6 and the eighth lens L8 satisfy the following formula:

[0082] 1.48 <Nd6<1.67,65.3<Vd6<88.3;1.49<Nd8<1.62,63<Vd8<98。

[0083] Where Nd6 and Nd8 represent the refractive indices of the sixth lens L6 and the eighth lens L8, respectively, and Vd6 and Vd8 represent the Abbe numbers of the sixth lens L6 and the eighth lens L8, respectively.

[0084] Specifically, when the sixth lens L6 and the eighth lens L8 are within this range, the chromatic aberration of the optical lens can be guaranteed, thereby achieving infrared confocal focus and making the CG filter more versatile.

[0085] This application uses five glass lenses: the first lens L1, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are glass spherical lenses. Compared with plastic lenses, by selecting glass lenses with higher refractive indices, the lens's ability to refract light can be effectively increased. At the same time, the range of choices for the refractive index and Abbe number of glass lenses is wide. By reasonably matching the refractive index and Abbe number of each lens, the chromatic aberration of the optical lens can be corrected to a large extent, thus playing a role in eliminating chromatic aberration.

[0086] Based on the above embodiments, refer to Figure 1 The central curvature radius R1 of the object side of the first lens L1 and the effective focal length EFFL (EFFL) of the optical lens satisfy the following condition: 3.0 < R1 / EFFL < 5.2.

[0087] The ratio of a lens's radius of curvature to its focal length directly affects the lens's imaging effect and optical performance. Regarding focal length changes: as the radius of curvature of a lens increases, its focal length also increases. That is, since a larger radius of curvature means a smaller degree of bending of the lens, the degree of light refraction within the lens decreases, leading to an increase in focal length. Regarding image quality: changes in the radius of curvature also affect the lens's image quality. A smaller radius of curvature results in stronger light divergence or convergence, thus affecting image sharpness and contrast. The effective focal length (EFFL) refers to the distance from the optical center (principal point) of the lens to the image plane (focal point). A longer EFFL allows for magnifying distant objects; a shorter EFFL allows for a wider shooting range.

[0088] Based on this, this application controls the ratio of the center curvature radius R1 of the object side of the first lens L1 to the effective focal length EFFL of the optical lens within this range, which helps to improve the light transmission brightness of the lens.

[0089] Based on the above embodiments, refer to Figure 1 The entrance pupil diameter (ENPD) of the optical lens and the total track length (TTL) of the optical lens satisfy the following condition: ENPD / TTL > 0.12.

[0090] The entrance pupil refers to the equivalent aperture formed after light enters the optical system and is refracted or reflected. The entrance pupil diameter (ENPD) determines how much light the optics can collect, directly affecting the brightness and resolution of the image. The total optical length (TTL) of an optical lens refers to the distance from the object-side surface of the first lens (L1) to the image plane.

[0091] This application achieves lens miniaturization by reasonably controlling the ratio of the entrance pupil diameter (ENPD) to the total optical length (TTL) of the optical lens to be greater than 0.12. This allows for control of the incident light beam aperture, increases the field of view and light intake of the optical lens, effectively compresses the size of the optical lens, and improves image brightness and resolution while ensuring the lens's large aperture characteristics.

[0092] Based on the above embodiments, refer to Figure 1 The optical back focal length (BFL) of the optical lens and the optical total length (TTL) of the optical lens satisfy the following condition: 0.186 ≤ BFL / TTL ≤ 0.202.

[0093] In this context, the optical back focal length (BFL) of an optical lens refers to the distance from the last surface of the lens to the image plane along the optical axis, specifically the distance from the image-side surface of the tenth lens L10 in this application to the image plane IMA. The optical back focal length (BFL) directly affects the final image quality and the space requirements for lens installation. By appropriately setting the optical back focal length (BFL) and total optical length (TTL) within this range, the assembly yield of the optical lens can be improved, and space can be reserved for the installation of optical components, facilitating lens assembly.

[0094] Based on the above embodiments, the optical lens may further include a filter CG, disposed in the optical path between the tenth lens L10 and the image plane IMA. The filter CG serves to filter light and protect the photosensitive chip in the imaging sensor. This application adopts a 5G5P structural design, which has high versatility of the filter CG. The filtering range of the filter CG is 436nm to 850nm. The imaging chip is used to convert the light signals collected by the optical lens into electrical signals, thereby ensuring the imaging effect of the optical lens.

[0095] Reference Figure 1 As shown in the embodiments of this application, each lens of the optical lens can be fixed inside a lens barrel and sealed or vacuum-encapsulated to ensure the stability and clarity of each lens surface and to ensure image quality. This is not shown in the embodiments of this application.

[0096] In summary, the optical lens provided in this embodiment of the invention adopts a 10-lens structure. By reasonably allocating parameters such as the material, optical power, center thickness of each lens, and on-axis spacing between each lens, the aberrations of the lens in the wavelength range of 436-850nm are reasonably corrected and balanced. This enables the optical lens to achieve excellent characteristics such as superior imaging, compact structure, large light transmission, large target surface, infrared confocal, and ultra-wide angle.

[0097] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0098] Example 1

[0099] Continue to refer to Figure 1 The optical lens provided in Embodiment 1 of the present invention includes a lens along the optical axis from the object plane ( Figure 1 (Not shown in the image) The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the aperture STO, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10 and the filter CG are arranged sequentially from the image plane IMA.

[0100] The first lens L1 is a glass spherical lens with negative optical power; the second lens L2 is a plastic aspherical lens with negative optical power; the third lens L3 is a plastic aspherical lens with positive optical power; the fourth lens L4 is a plastic aspherical lens with negative optical power; the fifth lens L5 is a glass spherical lens with positive optical power; the sixth lens L6 is a glass spherical lens with positive optical power; the seventh lens L7 is a glass spherical lens with negative optical power; the eighth lens L8 is a glass spherical lens with positive optical power; the ninth lens L9 is a plastic aspherical lens with negative optical power; and the tenth lens L10 is a plastic aspherical lens with positive optical power. A filter CG is positioned between the tenth lens L10 and the image plane IMA. The filter CG serves to filter light and protect the photosensitive chip in the imaging sensor.

[0101] refer to Figure 1 The optical lens has an effective focal length (EFFL) of 2.976mm, an aperture of F# of 1.082, and an image sensor size of [missing information]. The corresponding field of view is 159.00°, and the total optical length (TTL) of the optical lens is no greater than 22.5 mm. Table 1 details the specific optical physical parameters of each lens in the optical lens provided in Embodiment 1 of the present invention.

[0102] Table 1 Design values ​​of optical physical parameters of optical lenses

[0103]

[0104]

[0105] In Table 1, the surface number S is assigned according to the surface sequence of each lens; "STO" represents the aperture stop of the optical lens; IMA represents the image plane; the radius of curvature R represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "Infinity" indicates that the surface is flat and the radius of curvature is infinite; thickness represents the central axial distance between the current surface and the next surface; refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating that the current position is air and the refractive index is 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface; half-aperture represents half of the lens aperture. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0106] In this embodiment, the aspherical lens of the optical lens can satisfy the following formula:

[0107]

[0108] Where z represents the axial sagitta in the Z direction of the aspherical surface; r represents the distance from a point on the aspherical surface to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the fitted conic coefficients; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0109] For example, Table 2 details the aspherical coefficients of each lens in this embodiment one of feasible implementations.

[0110] Table 2 Design values ​​of aspherical coefficients for each lens in optical lenses.

[0111] Face number A B C D E F S3 2.02688E-03 -6.78334E-05 -3.41404E-05 5.48081E-06 -2.84209E-07 4.38500E-09 S4 6.19789E-03 -9.77718E-04 5.15747E-05 -3.48360E-06 -2.22050E-07 4.16850E-08 S5 -7.96240E-03 1.99331E-04 -3.30071E-05 -7.15764E-06 2.27480E-07 5.66055E-08 S6 -1.43760E-03 -2.88431E-05 -1.34223E-05 -6.40167E-07 -5.76158E-09 1.62190E-08 S7 2.15234E-04 -9.53909E-05 -1.94025E-06 -8.54906E-07 -6.31715E-08 9.62591E-09 S8 7.82609E-04 3.93060E-05 -2.40639E-06 -1.20166E-07 6.79716E-09 2.05140E-10 S16 2.81150E-04 -1.73926E-04 6.14630E-06 2.78739E-07 -6.81194E-09 5.65011E-11 S17 -1.70365E-03 -1.49628E-04 -3.75124E-06 7.16126E-07 1.17335E-08 -8.72204E-10 S18 -4.24740E-03 6.10874E-05 -1.74804E-05 1.71038E-07 5.93046E-08 -1.19993E-09 S19 8.32364E-06 -6.53443E-05 4.80437E-06 -6.07167E-07 2.10389E-08 2.16098E-10

[0112] Where 2.02688E-03 indicates that the coefficient A of surface number S3 is 2.02688 * 10^6. -3 And so on.

[0113] Furthermore, several performance tests were conducted on the optical lens provided in Embodiment 1, and the specific test results are as follows:

[0114] Figure 2 The axial aberration curve of the optical lens provided in Embodiment 1 of this application is shown in the reference diagram. Figure 2 The vertical direction represents the normalized aperture, with 0 indicating the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of image formation by the optical lens. Figure 2 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the optical lens is well controlled at each wavelength, which can meet the requirements of wide spectrum applications.

[0115] Example 2

[0116] Figure 3 This is a schematic diagram of the optical lens provided in Embodiment 2 of this application, with reference to... Figure 3 Embodiment 2 of this application provides an optical lens including an optical lens extending from the object plane along the optical axis ( Figure 1 The first lens L1, the second lens L2, the aperture STO, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10 and the filter CG are arranged sequentially from the image plane IMA (not shown).

[0117] The first lens L1 is a glass spherical lens with negative optical power; the second lens L2 is a plastic aspherical lens with negative optical power; the third lens L3 is a plastic aspherical lens with positive optical power; the fourth lens L4 is a plastic aspherical lens with negative optical power; the fifth lens L5 is a glass spherical lens with positive optical power; the sixth lens L6 is a glass spherical lens with positive optical power; the seventh lens L7 is a glass spherical lens with negative optical power; the eighth lens L8 is a glass spherical lens with positive optical power; the ninth lens L9 is a plastic aspherical lens with negative optical power; and the tenth lens L10 is a plastic aspherical lens with positive optical power. A filter CG is positioned between the tenth lens L10 and the image plane IMA. The filter CG serves to filter light and protect the photosensitive chip in the imaging sensor.

[0118] In this embodiment, the aperture stop STO can also be positioned between the second lens L2, which has negative optical power, and the third lens L3, which has positive optical power. The aperture stop STO can adjust the propagation direction of the light beam emitted from the second lens L2 to the incident surface of the third lens L3, thereby limiting the light beam or the field of view in the optical lens.

[0119] refer to Figure 3 The optical lens has an effective focal length (EFFL) of 2.949mm, an aperture of F# of 1.078, and an image sensor size of [missing information]. The corresponding field of view is 160.52°, and the total optical length (TTL) of the optical lens is no greater than 22.5 mm. Table 3 details the specific optical physical parameters of each lens in the optical lens provided in Embodiment 2 of the present invention.

[0120] Table 3 Design values ​​of optical physical parameters for optical lenses

[0121]

[0122] In Table 3, the surface number S is assigned according to the surface sequence of each lens; the radius of curvature R represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "Infinity" indicates that the surface is flat with an infinite radius of curvature; thickness represents the central axial distance between the current surface and the next surface; refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating that the current location is air and the refractive index is 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface; half-aperture represents half the lens aperture. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0123] In this embodiment, the aspherical lens of the optical lens can satisfy the following formula:

[0124]

[0125] Where z represents the axial sagitta in the Z direction of the aspherical surface; r represents the distance from a point on the aspherical surface to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the fitted conic coefficients; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0126] For example, Table 4 details the aspherical coefficients of each lens in Embodiment 2 of this application with a feasible implementation method.

[0127] Table 4 Design values ​​of aspherical coefficients for various lenses in optical lenses.

[0128] Face number A B C D E F S3 7.16586E-04 1.04942E-04 -3.03651E-05 5.57190E-06 -5.40783E-07 2.13626E-08 S4 4.93696E-03 -5.33448E-04 8.01492E-05 -3.17333E-06 -3.35718E-07 3.05495E-08 S6 -4.34546E-03 1.41848E-04 6.91025E-06 -3.08418E-06 2.65937E-07 -1.45823E-08 S7 -6.40133E-04 6.83917E-05 -3.11748E-06 -4.17226E-08 6.03274E-09 -1.73392E-09 S8 9.98021E-04 4.92702E-05 -4.97246E-07 1.98954E-07 2.46506E-08 -6.89121E-10 S9 -1.27550E-04 2.16681E-05 9.61427E-07 -2.40630E-08 -1.32037E-09 6.82570E-10 S16 -1.48556E-03 -1.16722E-04 5.43402E-06 -1.82485E-08 -5.69387E-08 2.07517E-09 S17 -3.98773E-03 -1.77149E-04 1.50722E-06 5.45513E-07 6.43162E-09 -1.39675E-09 S18 -4.85792E-03 1.66721E-04 -1.46251E-05 9.31605E-07 7.40314E-08 -4.16636E-09 S19 1.30133E-03 2.76775E-05 1.31826E-05 -6.27629E-07 1.88151E-08 5.01399E-10

[0129] Where 7.16586E-04 indicates that the coefficient A of surface number S3 is 7.16586 * 10^6. -4 And so on.

[0130] Furthermore, the performance parameters of the optical lens provided in Example 2 were tested, and the test results are as follows:

[0131] Figure 4 The axial aberration curve of the optical lens provided in Embodiment 2 of this application is shown in the reference diagram. Figure 4 The vertical direction represents the normalized aperture, with 0 indicating the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of image formation by the optical lens. Figure 4 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the optical lens is well controlled at each wavelength, which can meet the requirements of wide spectrum applications.

[0132] Example 3

[0133] Figure 5 This is a schematic diagram of the optical lens provided in Embodiment 3 of this application, with reference to... Figure 5 Embodiment 3 of this application provides an optical lens including an optical lens extending from the object plane along the optical axis ( Figure 1 (Not shown in the image) The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the aperture STO, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10 and the filter CG are arranged sequentially from the image plane IMA.

[0134] The first lens L1 is a glass spherical lens with negative optical power; the second lens L2 is a plastic aspherical lens with negative optical power; the third lens L3 is a plastic aspherical lens with positive optical power; the fourth lens L4 is a plastic aspherical lens with negative optical power; the fifth lens L5 is a glass spherical lens with positive optical power; the sixth lens L6 is a glass spherical lens with positive optical power; the seventh lens L7 is a glass spherical lens with negative optical power; the eighth lens L8 is a glass spherical lens with positive optical power; the ninth lens L9 is a plastic aspherical lens with negative optical power; and the tenth lens L10 is a plastic aspherical lens with positive optical power. A filter CG is positioned between the tenth lens L10 and the image plane IMA. The filter CG serves to filter light and protect the photosensitive chip in the imaging sensor.

[0135] refer to Figure 5 The optical lens has an effective focal length (EFFL) of 2.999mm, an aperture of F# of 1.032, and an image sensor size of [missing information]. The corresponding field of view is 159.44°, and the total optical length (TTL) of the optical lens is no greater than 22.5 mm. Table 5 details the specific optical physical parameters of each lens in the optical lens provided in Embodiment 3 of the present invention.

[0136] Table 5 Design values ​​of optical physical parameters for optical lenses

[0137]

[0138]

[0139] In Table 5, the surface number S is assigned according to the surface sequence of each lens; the radius of curvature R represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "Infinity" indicates that the surface is flat with an infinite radius of curvature; thickness represents the central axial distance between the current surface and the next surface; refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating that the current location is air and the refractive index is 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface; half-aperture represents half the lens aperture. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0140] In this embodiment, the aspherical lens of the optical lens can satisfy the following formula:

[0141]

[0142] Where z represents the axial sagitta in the Z direction of the aspherical surface; r represents the distance from a point on the aspherical surface to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the fitted conic coefficients; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0143] For example, Table 6 details the aspherical coefficients of each lens in Embodiment 3 of this application with a feasible implementation.

[0144] Table 6 Design values ​​of aspherical coefficients for various lenses in optical lenses.

[0145]

[0146]

[0147] Where 1.55135E-03 indicates that the coefficient A of surface number S3 is 1.55135 * 10. -3 And so on.

[0148] Furthermore, the performance parameters of the optical lens provided in Example 3 were tested, and the test results are as follows:

[0149] Figure 6 The axial aberration curve of the optical lens provided in Embodiment 3 of this application is shown in the reference diagram. Figure 6 The vertical direction represents the normalized aperture, with 0 indicating the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of image formation by the optical lens. Figure 6 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the optical lens is well controlled at each wavelength, which can meet the requirements of wide spectrum applications.

[0150] Example 4

[0151] Figure 7 This is a schematic diagram of the structure of the optical lens provided in Embodiment 4 of this application, with reference to... Figure 7 Embodiment 4 of this application provides an optical lens including an optical lens extending from the object plane along the optical axis ( Figure 1 The first lens L1, the second lens L2, the aperture STO, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10 and the filter CG are arranged sequentially from the image plane IMA (not shown).

[0152] The first lens L1 is a glass spherical lens with negative optical power; the second lens L2 is a plastic aspherical lens with negative optical power; the third lens L3 is a plastic aspherical lens with positive optical power; the fourth lens L4 is a plastic aspherical lens with negative optical power; the fifth lens L5 is a glass spherical lens with positive optical power; the sixth lens L6 is a glass spherical lens with positive optical power; the seventh lens L7 is a glass spherical lens with negative optical power; the eighth lens L8 is a glass spherical lens with positive optical power; the ninth lens L9 is a plastic aspherical lens with negative optical power; and the tenth lens L10 is a plastic aspherical lens with positive optical power. A filter CG is positioned between the tenth lens L10 and the image plane IMA. The filter CG serves to filter light and protect the photosensitive chip in the imaging sensor.

[0153] In this embodiment, the aperture stop STO can be positioned between the second lens L2, which has negative optical power, and the third lens L3, which has positive optical power. The aperture stop STO can adjust the propagation direction of the light beam emitted from the second lens L2 to the incident surface of the third lens L3, thereby limiting the light beam or the field of view in the optical lens.

[0154] refer to Figure 7 The optical lens has an effective focal length (EFFL) of 2.969mm, an aperture of F# of 1.079, and an image sensor size of [missing information]. The corresponding field of view is 159.40°, and the total optical length (TTL) of the optical lens is no greater than 22.5 mm. Table 7 details the specific optical physical parameters of each lens in the optical lens provided in Embodiment 4 of the present invention.

[0155] Table 7 Design values ​​of optical physical parameters for optical lenses

[0156]

[0157]

[0158] In Table 7, the surface number S is assigned according to the surface sequence of each lens; the radius of curvature R represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "Infinity" indicates that the surface is flat with an infinite radius of curvature; thickness represents the central axial distance between the current surface and the next surface; refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating that the current location is air and the refractive index is 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface; half-aperture represents half the lens aperture. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0159] In this embodiment, the aspherical lens of the optical lens can satisfy the following formula:

[0160]

[0161] Where z represents the axial sagitta in the Z direction of the aspherical surface; r represents the distance from a point on the aspherical surface to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the fitted conic coefficients; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0162] For example, Table 8 details the aspherical coefficients of each lens in Embodiment 4 of this application with a feasible implementation.

[0163] Table 8 Design values ​​of aspherical coefficients for various lenses in optical lenses.

[0164] Face number A B C D E F S3 3.76949E-04 1.45924E-04 -3.16477E-05 5.22740E-06 -5.29223E-07 2.18370E-08 S4 4.86091E-03 -5.11883E-04 7.54181E-05 -3.03335E-06 -2.92385E-07 2.51312E-08 S6 -4.24721E-03 1.48925E-04 3.77714E-06 -2.72739E-06 2.31575E-07 -1.22165E-08 S7 -7.31578E-04 6.17835E-05 -4.01642E-06 -5.68429E-08 7.35587E-09 -1.15878E-09 S8 9.64755E-04 4.59792E-05 -5.10546E-07 2.23604E-07 2.68540E-08 -9.29166E-10 S9 -7.79515E-05 2.83445E-05 1.35744E-06 7.07030E-09 -8.35380E-10 3.96859E-10 S16 -1.23229E-03 -1.18856E-04 5.55237E-06 -2.91171E-08 -5.34253E-08 1.53938E-09 S17 -3.87281E-03 -1.75098E-04 2.20905E-06 5.15023E-07 2.51035E-09 -1.36835E-09 S18 -4.92289E-03 1.68108E-04 -1.38359E-05 9.04619E-07 7.54205E-08 -4.19501E-09 S19 1.30332E-03 2.47445E-05 1.32693E-05 -6.77475E-07 2.10210E-08 5.92618E-10

[0165] Where 3.76949E-04 indicates that the coefficient A of surface number S3 is 3.76949 * 10. -4 And so on.

[0166] Furthermore, the performance parameters of the optical lens provided in Example 4 were tested, and the test results are as follows:

[0167] Figure 8 The axial aberration curve of the optical lens provided in Embodiment 4 of this application is shown in the figure. Figure 8 The vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of image formation by the optical lens. Figure 8 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the optical lens is well controlled at each wavelength, which can meet the requirements of wide spectrum applications.

[0168] In summary, the optical physical parameters of the first lens to the tenth lens in Embodiments 1, 2, 3 and 4 of this application are shown in Table 7.

[0169] Table 7 Design values ​​of optical physical parameters for optical lenses

[0170]

[0171]

[0172] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An optical lens, characterized in that, The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object plane to the image plane; the optical lens contains 10 lenses with optical power. The first lens is a glass spherical lens with negative optical power; the second lens is a plastic aspherical lens with negative optical power; the third lens is a plastic aspherical lens with positive optical power; the fourth lens is a plastic aspherical lens with negative optical power; the fifth lens is a glass spherical lens with positive optical power; the sixth lens is a glass spherical lens with positive optical power; the seventh lens is a glass spherical lens with negative optical power; the eighth lens is a glass spherical lens with positive optical power; the ninth lens is a plastic aspherical lens with negative optical power; and the tenth lens is a plastic aspherical lens with positive optical power. The optical power of each lens satisfies the following formula: -0.63≤Φ1 / Φ≤-0.48;-0.38≤Φ2 / Φ≤-0.20; 0.29≤Φ3 / Φ≤0.44; -0.18≤Φ4 / Φ≤-0.01; 0.19≤Φ5 / Φ≤0.45; -0.38≤Φ9 / Φ≤-0.08; 0.32≤Φ10 / Φ≤0.43; Wherein, Φ1, Φ2, Φ3, Φ4, Φ5, Φ9, and Φ10 represent the optical power of the first lens to the fifth lens, the ninth lens, and the tenth lens, respectively, and Φ represents the overall optical power of the optical lens.

2. The optical lens according to claim 1, characterized in that, Along the optical axis from the object plane to the image plane, the surface of the lens facing the object plane is called the object-side surface, and the surface of the lens closer to the image plane is called the image-side surface. The first lens has a convex object-side surface and a concave image-side surface; the second lens has a concave object-side surface and a convex image-side surface; the third lens has a convex image-side surface; the fourth lens has a concave object-side surface and a convex image-side surface; the fifth lens has a convex image-side surface; the sixth lens has a convex object-side surface and a convex image-side surface; the seventh lens has a concave object-side surface and a concave image-side surface; the eighth lens has a convex object-side surface and a convex image-side surface; the ninth lens has a concave image-side surface; and the tenth lens has a convex object-side surface and a convex image-side surface.

3. The optical lens according to claim 1, characterized in that, The sixth lens, the seventh lens, and the eighth lens are cemented together to form a cemented triplet lens group.

4. The optical lens according to claim 3, characterized in that, The total optical power of the triplex lens group satisfies the following formula: 0.05≤Φ678 / Φ≤0.28; Wherein, Φ678 represent the total optical power of the three-cement lens group composed of the sixth lens, the seventh lens and the eighth lens, respectively, and Φ represents the overall optical power of the optical lens.

5. The optical lens according to claim 1, characterized in that, The refractive index and Abbe number of each lens satisfy the following conditional formula: 1.8 <Nd1,21.1<Vd1<44;1.51<Nd2<1.64,19.1<Vd2<60; 19.1 <Vd4<60;1.8<Nd5,17.1<Vd5<38.3; 1.48 <Nd6<1.67,65.3<Vd6<88.3;1.49<Nd8<1.62,63<Vd8<98; 1.6 <Nd9<1.7,19.1<Vd9<30; Wherein, Nd1, Nd2, Nd5, Nd6, Nd8, and Nd9 represent the refractive indices of the first lens, the second lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens, respectively, and Vd1, Vd2, Vd4, Vd5, Vd6, Vd8, and Vd9 represent the Abbe numbers of the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens, respectively.

6. The optical lens according to claim 1, characterized in that, The entrance pupil diameter ENPD of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: ENPD / TTL≥0.

12.

7. The optical lens according to claim 1, characterized in that, The central radius of curvature R1 of the first lens object side surface satisfies the following relationship with the effective focal length EFFL of the optical lens: 3.0 < R1 / EFFL < 5.

2.

8. The optical lens according to claim 1, characterized in that, The optical back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following condition: 0.186 ≤ BFL / TTL ≤ 0.

202.

9. The optical lens according to claim 1, characterized in that, It also includes a filter located between the tenth lens and the image plane.

Images