Optical lens

Abstract

The invention discloses an optical lens, which comprises ten lenses sequentially arranged from an object plane to an image plane along an optical axis, and is characterized in that the first lens is a glass spherical lens with negative focal power; the second lens is a plastic aspheric lens with negative focal power; the third lens is a plastic aspheric lens with positive focal power; the fourth lens is a plastic aspheric lens with negative focal power; the fifth lens is a glass spherical lens with positive focal power; the sixth lens is a glass spherical lens with positive focal power; the seventh lens is a glass spherical lens with negative focal power; the eighth lens is a glass spherical lens with positive focal power; the ninth lens is a plastic aspheric lens with negative focal power; and the tenth lens is a plastic aspheric lens with positive focal power. Through the arrangement, the focal power, the position, the shape and the material of each lens are reasonably matched, and the design of the infrared confocal optical lens with ultra-large light transmission, large target surface and ultra-wide angle is realized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of optical devices, and in particular to an optical lens. Background Art

[0002] In the digital age, work in the fields of security and public safety is in full swing, so the demand for monitoring facilities is also increasing. Compared with zoom lenses, fixed-focus lenses are simple to design and manufacture, and the images of moving objects taken are clear and stable, with delicate pictures, making them occupy an important position in the security monitoring industry. In the field of security monitoring lenses, with the development of technology, ultra-wide-angle fixed-focus lenses have been widely used in the security field due to their high imaging quality and the ability to shoot at a wide angle outdoors.

[0003] The parameters of the mainstream fixed-focus large-aperture lenses on the market are usually close to F1.0, with a 1 / 2.7-inch chip, and the lens is large in size. At the same time, fill light is required at night or filters of different thicknesses are switched to ensure the quality of lens imaging at night. There are still problems such as the target surface is not large enough, the field of view is not wide enough, the size is not small enough, and the filter is not universal. Summary of the invention

[0004] The present invention provides an optical lens, which is composed of 5 glass lenses and 5 plastic lenses, and realizes an aperture of 1.0. The total optical length is no more than 22.5 mm, the imaging target surface can match a 1 / 2.5-inch chip, and the field of view angle is close to 160°, which meets the market demand for infrared confocal optical lenses.

[0005] An embodiment of the present invention provides an optical lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from an object plane to an image plane along an optical axis;

[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 direction from the object plane to the image plane along the optical axis, the surface of the lens facing the object plane is the object side surface, and the surface of the lens close to the image plane is the image side surface;

[0008] 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 concave, and the image side surface is convex; the image side surface of the third lens is convex; the object side surface of the fourth lens is concave, and the image side surface is convex; the image side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface is convex; the object side surface of the seventh lens is concave, and the image side surface is concave; the object side surface of the eighth lens is convex, and the image side surface is convex; the image side surface of the ninth lens is concave; the object side surface of the tenth lens is convex, and the image side surface is convex.

[0009] Optionally, the focal length of each lens satisfies the following conditional 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] Among them, Φ1, Φ2, Φ3, Φ4, Φ5, Φ9, and Φ10 respectively represent the optical powers of the first lens to the fifth lens, the ninth lens, and the tenth lens, 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 triplet lens group.

[0016] Optionally, the total focal length of the triplet lens group satisfies the following conditional formula: 0.05≤Φ678 / Φ≤0.28;

[0017] Among them, Φ678 respectively represents the total optical power of the three-cemented lens group composed of the sixth lens, the seventh lens and the eighth lens, 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] Among them, 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, an entrance pupil diameter ENPD of the optical lens and a total optical length TTL of the optical lens satisfy: ENPD / TTL≥0.12.

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

[0026] 3.0<R1 / EFFL<5.2.

[0027] Optionally, the optical back focus BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.186≤BFL / TTL≤0.202.

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

[0029] The optical lens provided by an embodiment of the present invention includes 10 lenses arranged in sequence from the object plane to the image plane along the optical axis, and the optical powers of the first lens to the tenth lens are negative-negative-positive-negative-positive-positive-negative-positive-negative-positive. Through the above arrangement, the optical power, position, shape and material of each lens are reasonably matched to achieve the design of an infrared confocal optical lens with ultra-large light transmission, large target surface and ultra-wide angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of an optical lens provided in Example 1 of the present application;

[0031] Figure 2 This is an axial aberration curve diagram of the optical lens provided in Example 1 of the present application;

[0032] Figure 3 A schematic diagram of the structure of an optical lens provided in Example 2 of the present application;

[0033] Figure 4 Axial aberration curve diagram of the optical lens provided in Example 2 of the present application;

[0034] Figure 5 A schematic diagram of the structure of an optical lens provided in Embodiment 3 of the present application;

[0035] Figure 6 This is an axial aberration curve diagram of the optical lens provided in Example 3 of the present application;

[0036] Figure 7 A schematic diagram of the structure of an optical lens provided in Embodiment 4 of the present application;

[0037] Figure 8 This is an axial aberration curve diagram of the optical lens provided in Example 4 of the present application. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the structure of the optical lens provided in Example 1 of the present application, refer to Figure 1 An optical lens provided by an embodiment of the present invention includes: Figure 1 : A first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a tenth lens L10 are arranged in sequence from the image plane IMA to the image plane (not shown).

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

[0041] refer to Figure 1In the embodiment of the present application, 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 in sequence along the optical axis from the object plane to the image plane in a lens barrel ( Figure 1 It should be noted that Figure 1 The structural schematic diagrams corresponding to the subsequent embodiments are only schematic diagrams of the structures, and the shapes such as aspherical surfaces are not represented according to the actual situation.

[0042] Among them, the focal length is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam. Its value is the reciprocal of the focal length, and it characterizes the ability of the optical lens to deflect light. The larger the absolute value of the focal length, the stronger the ability to bend light, and the smaller the absolute value of the focal length, the weaker the ability to bend light. When the focal length is a positive number, the refraction of light is convergent; when the focal length is a negative number, the refraction of light is divergent. The focal length can be used to characterize a refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a lens, and can also be used to characterize a lens formed by multiple lenses (i.e., a lens group).

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

[0044] In the embodiment of the present application, the aperture STO can be set between the fifth lens with positive focal power and the sixth lens with positive focal power. The aperture STO is set between the fifth lens L5 and the sixth lens L6 with positive focal power. By adjusting the propagation direction of the light beam emitted from the fifth lens L5 to the incident surface of the sixth lens L6, the light beam or field of view in the optical lens is limited. At the same time, the fifth lens L5 used at the front end of the aperture STO converges the light, so that the light has a larger light aperture before entering the aperture STO, increasing the aperture of the optical lens, avoiding the generation of stray light such as reflection at the position of the aperture STO, and being able to adjust the aberration of the lens to a certain extent, ensuring the aberration balance of the lens and the stability of high and low temperature performance, meeting the use requirements under different conditions.

[0045] The sixth lens L6 with positive focal length is used at the rear end of the aperture STO to converge the light along the optical axis, which can compress the beam aperture and limit the propagation angle and direction of the light, thereby adjusting the incident angle of the light entering the seventh lens L7 with negative focal length. Furthermore, the eighth lens L8 with positive focal length, the ninth lens L9 with negative focal length, and the tenth lens L10 with positive focal length are used in combination to converge the light beam after expansion, and then converge the beam again, which can correct the aberration at the rear end of the lens, which is conducive to forming a clear image on the image plane IMA, stabilizing the imaging quality of the optical lens, and at the same time, it is conducive to achieving the target surface requirements of the optical lens.

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

[0047] Considering that glass material has more stable performance than plastic material in high and low temperature environments, and glass lenses have stronger light turning ability. The present application sets the first lens L1, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 to use glass spherical lenses, which helps to reduce the number of lenses, reduce the size of the lens, reduce the focus problem caused by thermal effects, and improve the stability of fixed-focus lenses. Considering that aspherical lenses have a good ability to control optical aberrations and optical higher-order aberrations, the second lens L2, the third lens L3, the fourth lens L4, the ninth lens L9 and the tenth lens L10 are all plastic aspherical lenses, which can reduce the cost of the lens while controlling optical aberrations and optical higher-order aberrations.

[0048] The present application can also make the optical lens have good resolution in the high and low temperature range through the composition of 5G5P (i.e., 5 glass lenses and 5 plastic lenses), meeting the application requirements in the fields of security and public safety. For example, when the ambient temperature changes from -40 to 80°C, the focus will not shift and good performance can be maintained.

[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 the embodiments of the present application will not elaborate on this and will not limit this.

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

[0051]

[0052] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspheric polynomial, respectively.

[0053] Optional, reference Figure 1 , along the direction from the object plane to the image plane of the optical axis, the surface of the lens facing the object plane is the object side surface, and the surface of the lens close to the image plane is 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; the object side surface of the tenth lens L10 is convex, and the image side surface is convex.

[0054] The concave lens has a diverging effect on the transmitted light, and the convex lens has a converging effect on the transmitted light. The present application can achieve clear imaging of the optical lens by reasonably setting the surface shapes of the first lens L1 to the tenth lens L10.

[0055] Based on the above embodiments, Figure 1 , the focal length of the first lens L1 satisfies the following conditional formula: -0.63≤Φ1 / Φ≤-0.48, wherein Φ1 represents the focal length of the first lens L1, and Φ represents the overall focal length of the optical lens.

[0056] Specifically, the first lens L1 is a convex-concave glass spherical lens with negative optical power. The above optical power design is adopted to ensure that the optical lens can pass light at a large angle to achieve an ultra-wide-angle design.

[0057] Based on the above embodiments, Figure 1 , the refractive powers of the second lens L2 to the fourth lens L4 satisfy the following conditional 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 powers 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 aspheric lens with negative power, the third lens L3 is a plastic aspheric lens with positive power, and the fourth lens L4 is a concave-convex plastic aspheric lens with negative power. When the power of the second lens L2, the third lens L3 and the fourth lens L4 meets this range, it can not only effectively reduce the light deflection angle, but also facilitate the correction of aberrations and achieve a large target surface.

[0061] Based on the above embodiments, Figure 1 , the power of the fifth lens L5 satisfies the following conditional formula: 0.19≤Φ5 / Φ≤0.45, where Φ5 represents the 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, the light deflection angle and the effective light diameter of the lens can be effectively reduced to meet the lens structure and achieve a large aperture of the lens.

[0063] Based on the above embodiments, Figure 1 The sixth lens L6, the seventh lens L7 and the eighth lens L8 are cemented together to form a triplet lens group, which can effectively reduce the air space between the sixth lens L6, the seventh lens L7 and the eighth lens L8, reduce the total length of the optical lens, and help to eliminate chromatic aberration.

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

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

[0066] Based on the above embodiments, Figure 1 , the refractive powers of the ninth lens L9 and the tenth lens L10 satisfy the following conditional formula:

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

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

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

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

[0071] Among them, the refractive index is the ratio of the speed of light in a vacuum to the speed of light in the medium. It is mainly used to describe the material's ability to refract light. Different materials have different refractive indices. The higher the refractive index, the slower the light propagates in the 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 milder the dispersion of the medium, the larger the Abbe number. Generally speaking, the refractive index and the 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, Figure 1 , the refractive index and Abbe number of the first lens L1 and the fifth lens L5 satisfy the following conditional 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 the 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 pass light at a large angle, and the lens aperture meets the structural assembly requirements, while helping to reduce the overall length and volume of the lens.

[0076] Based on the above embodiments, Figure 1 , the refractive index and Abbe number of the second lens L2 and the ninth lens L9 satisfy the following conditional 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 the Abbe number of the second lens L2, the fourth lens L4 and the ninth lens L9 are within the range, the combination of the optical lens materials 5G5P can be guaranteed, thereby ensuring the chromatic aberration and smooth light transition, thereby ensuring the assembly tolerance.

[0081] Based on the above embodiments, Figure 1 , the refractive index and Abbe number of the sixth lens L6 and the eighth lens L8 satisfy the following conditional formula:

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

[0083] Wherein 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 confocality, making the filter CG more versatile.

[0085] This application uses 5 glass lenses, and 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 index, the refractive ability of the lenses to light can be effectively increased. At the same time, the refractive index and Abbe number of glass lenses have a wide range of choices. 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, thereby playing a role in achromatism.

[0086] Based on the above embodiments, Figure 1 , a central curvature radius R1 of the object side surface of the first lens L1 and an effective focal length EFFL (Effective Focal Length, EFFL) of the optical lens satisfy: 3.0<R1 / EFFL<5.2.

[0087] Among them, the ratio between the radius of curvature of the lens and the focal length directly affects the imaging effect and optical performance of the lens. For focal length changes: when the radius of curvature of the lens increases, its focal length will also increase. In other words, since the increase in the radius of curvature means that the curvature of the lens decreases, the degree of refraction of light inside the lens decreases, resulting in an increase in focal length. As for imaging quality: the change in the radius of curvature will also affect the imaging quality of the lens. A smaller radius of curvature will lead to a stronger divergence or convergence of light, which will affect the clarity and contrast of the image. The effective focal length EFFL refers to the distance from the optical center (principal point) of the optical lens to the imaging surface (focus). The longer the effective focal length EFFL, the more distant objects can be magnified and imaged; the shorter the effective focal length EFFL, the wider the shooting range.

[0088] Based on this, the present application controls the ratio of the central 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, Figure 1 , the entrance pupil diameter ENPD (Entrance Pupil Diameter, ENPD) of the optical lens and the total optical track length TTL (Total Track Length, TTL) of the optical lens satisfy: ENPD / TTL>0.12.

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

[0091] The present application reasonably controls the ratio of the entrance pupil diameter ENPD of the optical lens to the total optical length TTL of the optical lens to be greater than 0.12, thereby controlling the beam aperture of the incident light, increasing the field angle and the amount of light entering the optical lens, effectively compressing the volume of the optical lens, realizing the miniaturization of the lens, and at the same time improving the brightness and resolution of the image, thereby ensuring the large aperture characteristics of the lens.

[0092] Based on the above embodiments, Figure 1 , the optical back focus BFL (Back Focal Length, BFL) of the optical lens and the optical total length TTL of the optical lens satisfy: 0.186≤BFL / TTL≤0.202.

[0093] Among them, the optical back focus BFL of the optical lens refers to the distance from the last side of the lens in the optical lens to the image plane along the optical axis, that is, the distance from the image side of the tenth lens L10 to the image plane IMA in this application. The optical back focus BFL directly affects the final imaging quality of the optical lens and the space requirements for installation. By reasonably setting the optical back focus BFL and the total optical length TTL of the optical lens to meet this range, the assembly yield of the optical lens can be improved, and it is also helpful to reserve space for the installation of optical components and facilitate lens assembly. .

[0094] On the basis of the above embodiment, the optical lens may further include a filter CG, which is arranged in the optical path between the tenth lens L10 and the image plane IMA. The filter CG plays the role of filtering and protecting the photosensitive chip in the imaging sensor. The present application adopts the structural design of 5G5P, which has high versatility of the filter CG. The filter CG has a filtering range of 436nm to 850nm. Among them, the imaging chip is used to convert the light signal collected by the optical lens into an electrical signal, thereby ensuring the imaging effect of the optical lens.

[0095] Reference Figure 1 As shown, each lens of the optical lens provided in the embodiment of the present application can be fixed in a lens barrel and sealed or vacuum packaged to ensure the stability and clarity of the mirror surface of each lens and to ensure the imaging quality, which is not shown in the embodiment of the present application.

[0096] In summary, the optical lens provided in the embodiment of the present invention adopts a 10-lens structure. By reasonably allocating parameters such as the material, optical focal length, center thickness of each lens, and on-axis spacing between each lens, the aberration of the lens in the wavelength range of 436 to 850 nm is reasonably corrected and balanced, so that the above-mentioned optical lens can achieve excellent imaging, compact structure, large light transmission, large target surface, infrared confocal, ultra-wide angle and other excellent characteristics.

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

[0098] Embodiment 1

[0099] Continue to refer Figure 1 The first embodiment of the present invention provides an optical lens according to the embodiment of the present invention, comprising: Figure 1 : In the figure (not shown), 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 in sequence from the image plane IMA to the image plane IMA.

[0100] The first lens L1 is a glass spherical lens with negative power; the second lens L2 is a plastic aspherical lens with negative power; the third lens L3 is a plastic aspherical lens with positive power; the fourth lens L4 is a plastic aspherical lens with negative power; the fifth lens L5 is a glass spherical lens with positive power; the sixth lens L6 is a glass spherical lens with positive power; the seventh lens L7 is a glass spherical lens with negative power; the eighth lens L8 is a glass spherical lens with positive power; the ninth lens L9 is a plastic aspherical lens with negative power; and the tenth lens L10 is a plastic aspherical lens with positive power. The filter CG is arranged between the tenth lens L10 and the image plane IMA, and the filter CG plays the role of filtering light and protecting the photosensitive chip in the imaging sensor.

[0101] refer to Figure 1 The effective focal length EFFL of the optical lens is 2.976mm, the aperture F# is 1.082, and the imaging target size is The corresponding field of view angle 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 the first embodiment of the present invention.

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

[0103]

[0104]

[0105] Among them, the surface number S in Table 1 is numbered according to the surface order of each lens; "STO" represents the aperture of the optical lens; IMA represents the image plane; the radius of curvature R represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane; "Infinity" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air with a refractive index of 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface to the light; the half-aperture represents half of the lens aperture. Among them, the more severe the medium dispersion, the smaller the Abbe number; conversely, the milder the medium dispersion, the larger the Abbe number.

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

[0107]

[0108] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspheric polynomial, respectively.

[0109] Exemplarily, Table 2 describes in detail the aspheric coefficients of each lens in the first embodiment in a feasible implementation manner.

[0110] Table 2 Design values ​​of aspheric coefficients of each lens in the optical lens

[0111] Surface 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] Among them, 2.02688E-03 means that the coefficient A of the surface number S3 is 2.02688*10 -3 , and so on.

[0113] Furthermore, a number of performance tests were conducted on the optical lens provided in Example 1, and the test results are as follows:

[0114] Figure 2 This is an axial aberration curve diagram of the optical lens provided in Example 1 of the present application, referring to Figure 2 , the vertical direction represents the normalization of the aperture, 0 represents the optical axis, the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of optical lens imaging, which are 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 at each wavelength is well controlled and can meet the needs of wide spectrum applications.

[0115] Embodiment 2

[0116] Figure 3 This is a schematic diagram of the structure of the optical lens provided in Example 2 of the present application, refer to Figure 3 Embodiment 2 of the present application provides an optical lens including: Figure 1 : In the figure (not shown) to the image plane IMA, 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 in sequence.

[0117] The first lens L1 is a glass spherical lens with negative power; the second lens L2 is a plastic aspherical lens with negative power; the third lens L3 is a plastic aspherical lens with positive power; the fourth lens L4 is a plastic aspherical lens with negative power; the fifth lens L5 is a glass spherical lens with positive power; the sixth lens L6 is a glass spherical lens with positive power; the seventh lens L7 is a glass spherical lens with negative power; the eighth lens L8 is a glass spherical lens with positive power; the ninth lens L9 is a plastic aspherical lens with negative power; and the tenth lens L10 is a plastic aspherical lens with positive power. The filter CG is arranged between the tenth lens L10 and the image plane IMA, and the filter CG plays the role of filtering light and protecting the photosensitive chip in the imaging sensor.

[0118] The aperture STO in the embodiment of the present application can also be set between the second lens L2 with negative focal power and the third lens L3 with positive focal power. The aperture STO can adjust the propagation direction of the light beam emitted by the second lens L2 to the incident surface of the third lens L3, and limit the light beam or field of view in the optical lens.

[0119] refer to Figure 3 The effective focal length EFFL of the optical lens is 2.949mm, the aperture F# is 1.078, and the imaging target size is The corresponding field of view angle 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 the second embodiment of the present invention.

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

[0121]

[0122] Among them, the surface number S in Table 3 is numbered according to the surface order of each lens; the radius of curvature R represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side; "Infinity" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air with a refractive index of 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface to the light; the half-aperture represents half of the lens aperture. Among them, the more severe the medium dispersion, the smaller the Abbe number; conversely, the milder the medium dispersion, the larger the Abbe number.

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

[0124]

[0125] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspheric polynomial, respectively.

[0126] Exemplarily, Table 4 describes in detail the aspheric coefficients of each lens in Example 2 of the present application in a feasible implementation manner.

[0127] Table 4 Design values ​​of aspheric coefficients of each lens in the optical lens

[0128] Surface 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] Among them, 7.16586E-04 means that the coefficient A of the surface number S3 is 7.16586*10 -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 This is an axial aberration curve diagram of the optical lens provided in Example 2 of the present application, referring to Figure 4 , the vertical direction represents the normalization of the aperture, 0 represents the optical axis, the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of optical lens imaging, which are 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 at each wavelength is well controlled and can meet the needs of wide spectrum applications.

[0132] Embodiment 3

[0133] Figure 5 This is a schematic diagram of the structure of the optical lens provided in Example 3 of the present application, refer to Figure 5 Embodiment 3 of the present application provides an optical lens including: Figure 1 : In the figure (not shown), 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 in sequence from the image plane IMA to the image plane IMA.

[0134] The first lens L1 is a glass spherical lens with negative power; the second lens L2 is a plastic aspherical lens with negative power; the third lens L3 is a plastic aspherical lens with positive power; the fourth lens L4 is a plastic aspherical lens with negative power; the fifth lens L5 is a glass spherical lens with positive power; the sixth lens L6 is a glass spherical lens with positive power; the seventh lens L7 is a glass spherical lens with negative power; the eighth lens L8 is a glass spherical lens with positive power; the ninth lens L9 is a plastic aspherical lens with negative power; and the tenth lens L10 is a plastic aspherical lens with positive power. The filter CG is arranged between the tenth lens L10 and the image plane IMA, and the filter CG plays the role of filtering light and protecting the photosensitive chip in the imaging sensor.

[0135] refer to Figure 5 The effective focal length EFFL of the optical lens is 2.999mm, the aperture F# is 1.032, and the imaging target surface size is The corresponding field of view angle 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 the third embodiment of the present invention.

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

[0137]

[0138]

[0139] Among them, the surface number S in Table 5 is numbered according to the surface order of each lens; the radius of curvature R represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side; "Infinity" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air with a refractive index of 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface to the light; the half-aperture represents half of the lens aperture. Among them, the more severe the medium dispersion, the smaller the Abbe number; conversely, the milder the medium dispersion, the larger the Abbe number.

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

[0141]

[0142] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspheric polynomial, respectively.

[0143] Exemplarily, Table 6 describes in detail the aspheric coefficients of each lens in Example 3 of the present application in a feasible implementation manner.

[0144] Table 6 Design values ​​of aspheric coefficients of each lens in the optical lens

[0145]

[0146]

[0147] Among them, 1.55135E-03 means that the coefficient A of the 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 This is an axial aberration curve diagram of the optical lens provided in Example 3 of the present application, referring to Figure 6 , the vertical direction represents the normalization of the aperture, 0 represents the optical axis, the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of optical lens imaging, which are 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 at each wavelength is well controlled and can meet the needs of wide spectrum applications.

[0150] Embodiment 4

[0151] Figure 7 This is a schematic diagram of the structure of the optical lens provided in Example 4 of the present application, refer to Figure 7 Embodiment 4 of the present application provides an optical lens including: Figure 1 : In the figure (not shown) to the image plane IMA, 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 in sequence.

[0152] The first lens L1 is a glass spherical lens with negative power; the second lens L2 is a plastic aspherical lens with negative power; the third lens L3 is a plastic aspherical lens with positive power; the fourth lens L4 is a plastic aspherical lens with negative power; the fifth lens L5 is a glass spherical lens with positive power; the sixth lens L6 is a glass spherical lens with positive power; the seventh lens L7 is a glass spherical lens with negative power; the eighth lens L8 is a glass spherical lens with positive power; the ninth lens L9 is a plastic aspherical lens with negative power; and the tenth lens L10 is a plastic aspherical lens with positive power. The filter CG is arranged between the tenth lens L10 and the image plane IMA, and the filter CG plays the role of filtering light and protecting the photosensitive chip in the imaging sensor.

[0153] Among them, the aperture STO in the embodiment of the present application can be set between the second lens L2 with negative focal power and the third lens L3 with positive focal power. The aperture STO can adjust the propagation direction of the light beam emitted by the second lens L2 to the incident surface of the third lens L3, and limit the light beam or field of view in the optical lens.

[0154] refer to Figure 7 The effective focal length EFFL of the optical lens is 2.969mm, the aperture F# is 1.079, and the imaging target surface size is The corresponding field of view angle 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 the fourth embodiment of the present invention.

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

[0156]

[0157]

[0158] Among them, the surface number S in Table 7 is numbered according to the surface order of each lens; the radius of curvature R represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side; "Infinity" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the refractive index Nd represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air with a refractive index of 1. The Abbe number Vd represents the dispersion characteristics of the material between the current surface and the next surface to the light; the half-aperture represents half of the lens aperture. Among them, the more severe the medium dispersion, the smaller the Abbe number; conversely, the milder the medium dispersion, the larger the Abbe number.

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

[0160]

[0161] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspheric polynomial, respectively.

[0162] Exemplarily, Table 8 describes in detail the aspheric coefficients of each lens in Example 4 of the present application in a feasible implementation manner.

[0163] Table 8 Design values ​​of aspheric coefficients of each lens in the optical lens

[0164] Surface 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] Among them, 3.76949E-04 means that the coefficient A of the 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 This is an axial aberration curve diagram of the optical lens provided in Example 4 of the present application, referring to Figure 8 The vertical vertex represents the maximum pupil radius; the horizontal vertex represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of optical lens imaging. 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 at each wavelength is well controlled and can meet the needs of wide spectrum applications.

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

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

[0170]

[0171]

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

Claims

1. An optical lens, characterized in that: comprising 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 in sequence from the object plane to the image plane along the optical axis; 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.

2. The optical lens according to claim 1, characterized in that: Along the direction from the object plane to the image plane of the optical axis, the surface of the lens facing the object plane is the object side surface, and the surface of the lens close to the image plane is the image side surface; 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 concave, and the image side surface is convex; the image side surface of the third lens is convex; the object side surface of the fourth lens is concave, and the image side surface is convex; the image side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface is convex; the object side surface of the seventh lens is concave, and the image side surface is concave; the object side surface of the eighth lens is convex, and the image side surface is convex; the image side surface of the ninth lens is concave; the object side surface of the tenth lens is convex, and the image side surface is convex.

3. The optical lens according to claim 1, characterized in that: The optical power of each lens satisfies the following conditional 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; Among them, Φ1, Φ2, Φ3, Φ4, Φ5, Φ9, and Φ10 respectively represent the optical powers of the first lens to the fifth lens, the ninth lens, and the tenth lens, and Φ represents the overall optical power of the optical lens.

4. 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 triplet lens group.

5. The optical lens according to claim 4, characterized in that: The total focal length of the triplet lens group satisfies the following conditional formula: 0.05≤Φ678 / Φ≤0.28; Among them, Φ678 respectively represents the total optical power of the three-cemented lens group composed of the sixth lens, the seventh lens and the eighth lens, and Φ represents the overall optical power of the optical lens.

6. 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; Among them, 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.

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

12.

8. The optical lens according to claim 1, characterized in that: The central curvature radius R1 of the object side of the first lens and the effective focal length EFFL of the optical lens satisfy: 3.0<R1 / EFFL<5.

2.

9. The optical lens according to claim 1, characterized in that: The optical back focus BFL of the optical lens and the total optical length TTL of the optical lens satisfy the following relationship: 0.186≤BFL / TTL≤0.

202.

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

Images