Optical lens, camera module and terminal equipment

Abstract

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises eight lenses, the first lens has negative refractive power, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface; the second lens element with negative refractive power has a concave object-side surface and a convex image-side surface, respectively. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, respectively. The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The seventh lens element with negative refractive power has a concave object-side surface and a convex image-side surface, respectively. The object side surface and the image side surface of the eighth lens are respectively a convex surface and a concave surface. The optical lens satisfies the following relational expressions: 65 DEG < = FOV < = 80 DEG, and 7.8 DEG < = TTL / IMGH < = 10.5.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular, to an optical lens, a camera module, and a terminal device. Background Art

[0002] With the rapid development of automotive assisted driving technology, the application of optical lenses in automobiles has become increasingly widespread. Especially in the fields of in-vehicle reverse imaging systems, dash cams, automatic parking systems, panoramic imaging systems, and road navigation, optical lenses have become indispensable key components.

[0003] In an autonomous driving assistance system, an in-vehicle lens is a key device for obtaining external information. For safety considerations, the performance requirements for in-vehicle lenses in actual application scenarios are very strict. First of all, the in-vehicle lens needs to have a clearer and wider field of view to fully collect environmental information and ensure driving safety; secondly, the in-vehicle lens needs to have the performance of clear imaging at both close and long distances; in addition, the in-vehicle lens should also meet the requirements of a thin and light design.

[0004] In summary, there is a need in the art for an optical lens with characteristics such as miniaturization, high pixel count, and large field of view to meet the requirements of autonomous driving applications. Summary of the Invention

[0005] Embodiments of the present application disclose an optical lens, a camera module, and a terminal device. The optical lens has characteristics such as miniaturization, high pixel count, and large field of view, and can meet the requirements of an autonomous driving assistance system.

[0006] To achieve the above object, in a first aspect, the present application discloses an optical lens, which has a total of eight lenses with refractive power. The optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence along the optical axis from the object side to the image side; The first lens has negative refractive power. The object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; The second lens has negative refractive power. The object side surface of the second lens is concave near the optical axis, and the image side surface of the second lens is convex near the optical axis; The third lens has positive refractive power. The object side surface and the image side surface of the third lens are both convex near the optical axis; The fourth lens has positive refractive power. The object side surface and the image side surface of the fourth lens are both convex near the optical axis; The fifth lens has negative refractive power. The object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; The sixth lens has a positive refractive power, and both the object side and the image side of the sixth lens are convex near the optical axis; The seventh lens has a negative refractive power. The object side of the seventh lens is concave near the optical axis, and the image side of the seventh lens is convex near the optical axis; The object side of the eighth lens is convex near the optical axis, and the image side of the eighth lens is concave near the optical axis; The optical lens satisfies the following relationship: 65° ≤ FOV ≤ 80° and 7.8 ≤ TTL / IMGH ≤ 10.5; Wherein, FOV is the maximum field of view angle of the optical lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens.

[0007] In the optical lens provided by this application, the first lens has a negative optical power, the object side is convex, and the image side is concave. That is, the first lens is in a meniscus shape with the convex side facing the object side, which can effectively collect incident light with a large field of view angle and increase the field of view angle of the fixed-focus lens. The second lens has a negative optical power, the object side is concave, and the image side is convex, which can initially correct the astigmatism of the optical lens and effectively control the light path at the same time to achieve a larger aperture. The third lens has a positive optical power, and the object side is convex, which can effectively collect and compress the incident light on the object side, make the light transition smoothly to the optical system on the image side, and improve the illuminance of the optical lens. The fourth lens has a positive optical power, and both the object side and the image side are convex, which is beneficial to reducing the incident angle of light after passing through the aperture, so that more light enters the optical lens on the image side and improves the illuminance of the optical lens. The fifth lens has a negative optical power, the object side is concave, and the image side is convex. The fifth lens cooperates with the fourth lens, which is beneficial to correcting and balancing various aberrations, improving the resolution of the optical lens, effectively reducing the tolerance sensitivity, and improving the imaging quality of the optical system. The sixth lens has a positive optical power, and both the object side and the image side are convex near the optical axis, which can converge light, reduce the overall optical length, and further realize the miniaturized design of the optical lens. The seventh lens has a negative optical power, the object side is concave, and the image side is convex, which can correct the astigmatism of the optical lens and effectively control the light path at the same time to achieve a larger aperture. The seventh lens cooperates with the sixth lens to further balance aberrations and correct chromatic aberration, improving the imaging quality of the optical system. Through the specific surface shape matching and reasonable optical power distribution of the optical lens, the imaging quality of the optical lens can be improved, aberrations can be reduced, the imaging quality of the optical lens can be improved, making the optical lens have the characteristics of miniaturization, high pixel and large field of view angle, and can meet the requirements of the autonomous driving assistance system.

[0008] The optical lens satisfies the relationship 65° ≤ FOV ≤ 80°. By reasonably setting the maximum field of view angle of the optical lens, sufficient field of view angle can be provided for the optical lens to meet the requirement of large field of view angle of the optical lens.

[0009] The optical lens satisfies the relationship 7.8 ≤ TTL / IMGH ≤ 10.5. Under the condition of a certain image height of the optical lens, by controlling the ratio of the image height to the total optical length of the optical lens, the optical lens has a smaller total length to achieve miniaturization.

[0010] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationships: 5.5 ≤ TTL / F ≤ 6.8, and / or, 1.3 ≤ F / IMGH ≤ 1.8, and / or, 1.5 ≤ FNO ≤ 1.6; Wherein, F is the focal length of the optical lens, and FNO is the aperture number of the optical lens.

[0011] The optical lens satisfies the relationship 5.5 ≤ TTL / F ≤ 6.8, which is beneficial to realizing the miniaturization of the optical lens, improving the resolution, and reducing the lens sensitivity. At the same time, it can also make the optical lens have a wide-angle characteristic.

[0012] The optical lens satisfies the relationship 1.3 ≤ F / IMGH ≤ 1.8. By restricting the ratio of the focal length of the optical lens to the image height corresponding to the maximum field of view angle of the optical lens within a reasonable range, it is beneficial for the optical lens to achieve the large image plane characteristic and improve the resolution of the optical lens.

[0013] The optical lens satisfies the relationship 1.5 ≤ FNO ≤ 1.6. By restricting the aperture number of the optical lens, it can meet the large aperture required by the optical lens, improve the light input amount, make the illumination of the optical lens high, and enable it to have good imaging quality in darker environments such as at night or on rainy and cloudy days, meeting the requirements of large aperture and high resolution.

[0014] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationships: 1.9 ≤ R1 / R2 ≤ 3.5, and / or, -1.4 ≤ F / R3 ≤ -0.9; Wherein, R1 is the curvature radius of the object side surface of the first lens at the optical axis, R2 is the curvature radius of the image side surface of the first lens at the optical axis, F is the focal length of the optical lens, and R3 is the curvature radius of the object side surface of the second lens at the optical axis.

[0015] The optical lens satisfies the relationship 1.9 ≤ R1 / R2 ≤ 3.5. By reasonably matching the ratio relationship between the curvature radii of the object side and the image side of the first lens on the optical axis, the surface type difference of the first lens is reasonably set, which is beneficial to controlling the shape of the first lens, correcting the aberration generated by itself, and improving the imaging quality.

[0016] The optical lens satisfies the relationship -1.4 ≤ F / R3 ≤ -0.9. By appropriately increasing the curvature radius of the object side of the second lens on the optical axis within a certain range and reasonably controlling the ratio of the focal length of the optical lens to the curvature radius of the object side of the second lens on the optical axis, the convex surface can face the image side, further converge the light, suppress the edge field of view, and thus improve the imaging quality of the optical lens.

[0017] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationships: -3.0 ≤ R5 / R4 ≤ -1.3, and / or, 1.1 ≤ CT3 / ET3 ≤ 1.45, and / or, -0.9 ≤ (R9 - R10) / (R9 + R10) ≤ -0.85; Wherein, R5 is the curvature radius of the object side of the third lens on the optical axis, R4 is the curvature radius of the image side of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, ET3 is the distance in the optical axis direction from the maximum effective aperture of the object side of the third lens to the maximum effective aperture of the image side of the third lens, R9 is the curvature radius of the object side of the fifth lens on the optical axis, and R10 is the curvature radius of the image side of the fifth lens on the optical axis.

[0018] The optical lens satisfies the relationship -3.0 ≤ R5 / R4 ≤ -1.3. By appropriately controlling the curvature radius of the image side of the second lens on the optical axis and the curvature radius of the object side of the third lens on the optical axis within a certain range, the aberration of the optical lens can be corrected and the light passing through the lens can be ensured to be gentle, thereby improving the imaging stability of the optical lens.

[0019] The optical lens satisfies the relationship 1.1 ≤ CT3 / ET3 ≤ 1.45, which can reasonably control the thickness ratio of the third lens, thereby optimizing the surface type of the third lens, being beneficial to the effective convergence of large-angle incident light, and making the light passing through the third lens have a small deflection angle, so that the generation of stray light can be reduced, and good imaging performance can be ensured.

[0020] The optical lens satisfies the relationship -0.9 ≤ (R9 - R10) / (R9 + R10) ≤ -0.85. By reasonably matching the ratio relationship between the curvature radii of the object side and the image side of the fifth lens on the optical axis, the surface type of the fifth lens can be reasonably set, which is beneficial to controlling the shape of the fifth lens, correcting the aberration generated by itself, and improving the imaging quality.

[0021] As an alternative implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions: -6.0 ≤ F1 / CT1 ≤ -2.2, and / or, 1.8 ≤ F4 / CT4 ≤ 3.8, and / or, 2.8 ≤ F6 / CT6 ≤ 3.7; Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F4 is the focal length of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, F6 is the focal length of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis.

[0022] The optical lens satisfying the relational expression -6.0 ≤ F1 / CT1 ≤ -2.2 can reasonably limit the relationship between the focal length and the thickness of the first lens, facilitate the correction of aberration, and contribute to improving the assembly yield of the optical lens.

[0023] The optical lens satisfying the relational expression 1.8 ≤ F4 / CT4 ≤ 3.8, by reasonably controlling the relationship between the focal length and the thickness of the fourth lens, the focal length of the fourth lens will not be too large, facilitating the correction of aberration, and can reduce the tolerance sensitivity of the fourth lens, reduce the processing difficulty of the process, and is beneficial to improving the assembly yield of the optical lens.

[0024] The optical lens satisfying the relational expression 2.8 ≤ F6 / CT6 ≤ 3.7, by reasonably controlling the relationship between the focal length and the thickness of the sixth lens, the focal length of the sixth lens will not be too large, facilitating the correction of aberration, and can reduce the tolerance sensitivity of the sixth lens, reduce the processing difficulty of the process, and is beneficial to improving the assembly yield of the optical lens.

[0025] As an alternative implementation, in the embodiment of the first aspect of the present application, the image side of the fourth lens is glued to the object side of the fifth lens, the image side of the sixth lens is glued to the object side of the seventh lens, and the optical lens satisfies the following relational expressions: 3.9 ≤ F45 / F ≤ 12, and / or, -1.3 mm ≤ (F6 / Vd6) + (F7 / Vd7) ≤ -0.5 mm, and / or, 2.3 ≤ F67 / F ≤ 3.3, and / or, -7 ≤ F7 / F ≤ -3; Wherein, F45 is the combined focal length of the fourth lens and the fifth lens, F is the focal length of the optical lens, F6 is the focal length of the sixth lens, Vd6 is the Abbe number of the sixth lens, F7 is the focal length of the seventh lens, Vd7 is the Abbe number of the seventh lens, and F67 is the combined focal length of the sixth lens and the seventh lens.

[0026] The optical lens satisfies the relation 3.9 ≤ F45 / F ≤ 12. By reasonably matching the focal lengths of the cemented lens composed of the fourth lens and the fifth lens, it is beneficial to correct chromatic aberration and balance various aberrations, improve the resolution ability, effectively reduce the tolerance sensitivity, and enhance the imaging quality of the optical lens.

[0027] The optical lens satisfies the relation -1.3 mm ≤ (F6 / Vd6) + (F7 / Vd7) ≤ -0.5 mm. By reasonably controlling the sum of the ratio of the focal length to the Abbe number of the sixth lens and the ratio of the focal length to the Abbe number of the seventh lens, the dispersion of the optical lens can be effectively offset, which is beneficial to achieving confocal for both visible light and infrared bands.

[0028] The optical lens satisfies the relation 2.3 ≤ F67 / F ≤ 3.3. By reasonably matching the focal lengths of the cemented lens, it is beneficial to correct chromatic aberration and balance various aberrations, improve the resolution ability, effectively reduce the tolerance sensitivity, and enhance the imaging quality of the optical lens.

[0029] The optical lens satisfies the relation -7 ≤ F7 / F ≤ -3. By reasonably configuring the focal length of the seventh lens, it is beneficial to correct the aberration of the optical lens and improve the imaging quality.

[0030] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relations: 1.5 ≤ SD1 / IMGH ≤ 2.0, and / or, 1.55 ≤ SD1 / SD16 ≤ 1.95, and / or, 1.0 ≤ SD6 / SD7 ≤ 1.25; Wherein, SD1 is the maximum effective semi-aperture of the object side of the first lens, SD16 is the maximum effective semi-aperture of the image side of the eighth lens, SD6 is the maximum effective semi-aperture of the image side of the third lens, and SD7 is the maximum effective semi-aperture of the object side of the fourth lens.

[0031] The optical lens satisfies the relation 1.5 ≤ SD1 / IMGH ≤ 2.0. By reasonably controlling the size of the maximum effective aperture of the object side of the first lens, it is beneficial to achieve the miniaturized design of the optical lens.

[0032] The optical lens satisfies the relation 1.55 ≤ SD1 / SD16 ≤ 1.95. By reasonably controlling the ratio of the maximum effective semi-aperture of the object side of the first lens to the maximum effective semi-aperture of the image side of the eighth lens, the optical lens has the characteristic of a small aperture, can effectively converge the light, and enable the light to better enter the imaging surface of the optical lens.

[0033] The optical lens satisfies the relation 1.0 ≤ SD6 / SD7 ≤ 1.25. In this way, the fourth lens has the characteristic of a small aperture, which can effectively converge the light rays of the third lens, enabling the light rays to better enter the imaging surface of the optical lens.

[0034] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relations: 8.0°·mm -1 ≤ FOV / F ≤ 13.0°·mm -1 , and / or, 25mm ≤ TTL*IMGH / F ≤ 32mm, and / or, 42° ≤ FOV / FNO ≤ 54°, and / or, 1.9 ≤ ∑CT / ∑AT ≤ 2.3; Wherein, F is the focal length of the optical lens, FNO is the aperture number of the optical lens, ∑CT is the sum of the thicknesses of all the lenses from the first lens to the eighth lens on the optical axis, and ∑AT is the sum of the air intervals between adjacent two lenses from the first lens to the eighth lens.

[0035] The optical lens satisfies the relation 8.0°·mm -1 ≤ FOV / F ≤ 13.0°·mm -1 , by reasonably controlling the ratio range between the maximum field of view angle and the focal length of the optical lens, it helps to ensure the low sensitivity of the optical lens. At the same time, it also helps to achieve a smaller chief ray angle, a long back focal length, and a high resolution.

[0036] The optical lens satisfies the relation 25mm ≤ TTL*IMGH / F ≤ 32mm. This relation reflects the constraint situation of the optical lens in terms of the characteristics of the target surface size and volume. When this relation is satisfied, it can meet the requirement of the fixed-focus lens to adapt to a large-size imaging surface (imaging chip), meet the market demand for the miniaturization of the fixed-focus lens, and enable the fixed-focus lens to meet the market demands of both a large target surface and miniaturization at the same time.

[0037] The optical lens satisfies the relation 42° ≤ FOV / FNO ≤ 54°. By reasonably controlling the relationship between the field of view angle and the aperture number of the optical lens, providing a reasonable field of view angle and aperture number for the optical lens, it can balance the design difficulty and the requirement of the field of view angle. At the same time, it enables the aperture to change within a reasonable range, providing a combined effect of a large viewing angle and a large aperture, and meeting the characteristics of the optical lens having a large aperture, a high relative illuminance, and a small distortion.

[0038] The optical lens satisfies the relationship 1.9 ≤ ∑CT / ∑AT ≤ 2.3. By reasonably controlling the ratio of the sum of the thicknesses of all lenses on the optical axis to the sum of the air gaps between adjacent two lenses among the first lens to the seventh lens, the overall structure of the optical lens is made more compact, which is beneficial to shortening the total length of the optical lens, thereby realizing the miniaturization of the optical lens.

[0039] In a second aspect, the present application discloses an imaging module, which includes an image sensor and the above optical lens, and the image sensor is disposed on the image side of the optical lens.

[0040] In a third aspect, the present application discloses a terminal device, which includes a housing and the above imaging module, and the imaging module is disposed in the housing.

[0041] Compared with the prior art, the beneficial effects of the present application are as follows: In the optical lens provided by the present application, the first lens has a negative optical power, the object side is convex, and the image side is concave, that is, the first lens is in a meniscus shape with the convex side facing the object side, which can effectively collect incident light with a large field of view angle and increase the field of view angle of the fixed-focus lens. The second lens has a negative optical power, the object side is concave, and the image side is convex, which can initially correct the astigmatism of the optical lens and effectively control the light path at the same time to achieve a larger aperture. The third lens has a positive optical power, and the object side is convex, which can effectively collect and compress the incident light on the object side, so that the light smoothly transitions to the optical system on the image side and improves the illuminance of the optical lens. The fourth lens has a positive optical power, and both the object side and the image side are convex, which is beneficial to depressing the incident angle of the light after passing through the aperture, so that more light enters the optical lens on the image side and improves the illuminance of the optical lens. The fifth lens has a negative optical power, the object side is concave, and the image side is convex. The setting of the fifth lens in cooperation with the fourth lens is beneficial to correcting and balancing various aberrations, improving the resolution ability of the optical lens, and effectively reducing the tolerance sensitivity and improving the imaging quality of the optical system. The sixth lens has a positive optical power, and both the object side and the image side are convex near the optical axis, which can converge the light, reduce the optical total length, and further realize the miniaturization design of the optical lens. The seventh lens has a negative optical power, the object side is concave, and the image side is convex, which can correct the astigmatism of the optical lens and effectively control the light path at the same time to achieve a larger aperture. The seventh lens in cooperation with the sixth lens can further balance the aberrations, correct the chromatic aberration, and improve the imaging quality of the optical system. Through the specific surface shape matching and reasonable optical power distribution, the optical lens can improve the imaging quality of the optical lens, reduce the aberrations, improve the imaging quality of the optical lens, make the optical lens have the characteristics of miniaturization, high pixel and large field of view angle, and can meet the requirements of the autonomous driving assistance system.

[0042] The optical lens satisfies the relation 65° ≤ FOV ≤ 80°. By reasonably setting the maximum field of view angle of the optical lens, sufficient field of view angle can be provided for the optical lens to meet the requirement of large field of view angle of the optical lens.

[0043] The optical lens satisfies the relation 7.8 ≤ TTL / IMGH ≤ 10.5. Under the condition of a certain image height of the optical lens, by controlling the ratio of the image height to the total optical length of the optical lens, the optical lens can have a smaller total length to achieve miniaturization. Brief Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic structural diagram of the optical lens disclosed in Embodiment 1 of the present application; Figure 2 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 1 of the present application; Figure 3 It is a schematic structural diagram of the optical lens disclosed in Embodiment 2 of the present application; Figure 4 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 2 of the present application; Figure 5 It is a schematic structural diagram of the optical lens disclosed in Embodiment 3 of the present application; Figure 6 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 3 of the present application; Figure 7 It is a schematic structural diagram of the optical lens disclosed in Embodiment 4 of the present application; Figure 8 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 4 of the present application; Figure 9 It is a schematic structural diagram of the optical lens disclosed in Embodiment 5 of the present application; Figure 10 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Embodiment 5 of the present application; Figure 11 It is a schematic structural diagram of the optical lens disclosed in Embodiment 6 of the present application; Figure 12The spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical lens disclosed in Embodiment 6 of the present application; Figure 13 The structural schematic diagram of the optical lens disclosed in Embodiment 7 of the present application; Figure 14 The spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical lens disclosed in Embodiment 7 of the present application; Figure 15 The structural schematic diagram of the camera module disclosed in the present application; Figure 16 The structural schematic diagram when the terminal device disclosed in the present application is an automobile. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0047] In the present application, terms such as "upper", "front", "rear", "top", "inner", "outer", "middle", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0048] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances.

[0049] In addition, the term "arrangement" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0051] The application of the assisted driving system in automobiles is increasing, which puts forward higher requirements for the accurate recording and judgment of the assisted driving system for the surrounding environment of the vehicle body, especially on cloudy days, evenings or nights with weak light. To meet these requirements, the optical lens applied to the assisted driving system needs to have a large aperture, high relative illuminance and a large target surface, so as to improve the brightness when the optical lens takes pictures and improve the clarity of imaging. In addition, in low-light environments, such as night environments, the optical lens also needs to be able to clearly obtain the situation of the road surface and the surrounding environment, which requires the optical lens to be able to respond to infrared light. That is to say, it is required that the optical lens can achieve confocal shooting in different light environments (visible light and infrared light).

[0052] However, for the optical lenses in the related art, it is necessary to increase the number or size of the lenses to improve the resolution of the optical lens, which goes against the trend of miniaturization design. Or, when the optical lens has the characteristics of high-definition shooting, the accuracy of imaging needs to be sacrificed. That is to say, there are often obvious chromatic aberration, astigmatism and distortion. Or, the shooting performance of the optical lens in low-light environments is low and cannot meet the usage requirements in rainy days or at night.

[0053] The technical solution of the present application will be further described below in conjunction with the embodiments and the drawings.

[0054] Please refer to Figure 1 , the present application discloses an optical lens 100, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power, and the eighth lens L8 has a positive refractive power or a negative refractive power. When imaging, light enters 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 and the eighth lens L8 in sequence from the object side of the first lens L1, and finally forms an image on the imaging surface SI of the optical lens 100.

[0055] Further, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 of the first lens L1 is concave near the optical axis; the object side surface S3 of the second lens L2 is concave near the optical axis, and the image side surface S4 of the second lens L2 is convex near the optical axis; the object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 of the third lens L3 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is convex near the optical axis, and the image side surface S8 of the fourth lens L4 is convex near the optical axis; the object side surface S9 of the fifth lens L5 is concave near the optical axis, and the image side surface S10 of the fifth lens L5 is convex near the optical axis; the object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S12 of the sixth lens L6 is convex near the optical axis; the object side surface S13 of the seventh lens L7 is concave near the optical axis, and the image side surface S14 of the seventh lens L7 is convex near the optical axis; the object side surface S15 of the eighth lens L8 is convex near the optical axis, and the image side surface S16 of the eighth lens L8 is concave on the optical axis.

[0056] Optionally, all the lenses in the optical lens 100 can be made of glass material, or all can be made of plastic material, or some lenses are made of glass material and some lenses are made of plastic material. Preferably, all the lenses in the optical lens 100 are made of glass material. The lens made of glass can suppress the shift of the back focal length of the optical lens 100 caused by temperature change, so as to improve the stability of the optical lens 100. At the same time, using glass material can avoid the imaging blur of the optical lens 100 caused by the high and low temperature changes in the use environment, which affects the normal use of the optical lens 100.

[0057] Optionally, the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be spherical lenses, and the second lens L2 and the eighth lens L8 can be aspherical lenses. Combining spherical lenses and aspherical lenses can improve high-order aberrations, and thus improve the imaging quality of the optical lens 100. Among them, the second lens L2 and the eighth lens L8 are set as aspherical surfaces. Through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens 100 can be improved, the aberration can be reduced, and the imaging quality of the optical lens 100 can be improved.

[0058] In some embodiments, the optical lens 100 further includes a diaphragm 102. The diaphragm 102 can be an aperture diaphragm and / or a field diaphragm, and it can be disposed between the image side surfaces S6 of the third lens L3 of the optical lens 100. It can be understood that in other embodiments, the diaphragm 102 can also be disposed between other lenses, and the setting is adjusted according to the actual situation, and no specific limitation is made in this embodiment.

[0059] In some embodiments, the optical lens 100 further includes a filter 110. The filter 110 can be disposed between the image side S16 of the eighth lens L8 and the imaging surface SI of the optical lens 100. The filter 110 is used to filter out stray light, enabling the optical lens 100 to image more clearly and accurately. Of course, in other embodiments, the filter 110 can also be disposed between other lenses and adjusted according to actual situations, and no specific limitation is made in this embodiment. In this embodiment, the optical lens 100 can clearly image in both visible light and infrared light environments and has good infrared confocal characteristics, that is, the optical lens 100 can also image and obtain good imaging effects in dim environments and other special application scenarios. Preferably, the filter 110 can be made of glass. Of course, in other embodiments, the filter 110 can also be made of optical glass coating or filters 110 of other materials, which can be selected according to actual needs, and no specific limitation is made in this embodiment.

[0060] In some embodiments, the optical lens 100 further includes a protective glass 120. The protective glass 120 is disposed between the filter 110 and the imaging surface 101, so that it can be close to the image sensor during subsequent assembly, thereby playing a protective role.

[0061] In one embodiment, the optical lens 100 satisfies the relation 65° ≤ FOV ≤ 80°. By reasonably setting the maximum field of view angle of the optical lens 100, a sufficient field of view angle can be provided for the optical lens 100 to meet the large field of view angle requirements of the optical lens 100.

[0062] In one embodiment, the optical lens 100 satisfies the relation 7.8 ≤ TTL / IMGH ≤ 10.5. When the image height of the optical lens 100 is certain, by controlling the ratio of the total optical length TTL to the image height IMGH of the optical lens 100, the optical lens 100 can have a smaller total length to achieve miniaturization.

[0063] With the above settings, the first lens L1 has a negative optical power, the object side S1 is convex, and the image side S2 is concave. That is, the first lens L1 is in the shape of a meniscus with the convex side facing the object side, which can effectively collect incident light with a large field angle and increase the field angle of the fixed-focus lens. The second lens L2 has a negative optical power, the object side S3 is concave, and the image side S4 is convex, which can initially correct the astigmatism of the optical lens 100 and effectively control the light path at the same time to achieve a larger aperture. The third lens L3 has a positive optical power, and the object side S5 is convex, which can effectively collect and compress the incident light on the object side, making the light smoothly transition to the optical system on the image side and improving the illuminance of the optical lens 100. The fourth lens L4 has a positive optical power, and both the object side S7 and the image side S8 are convex, which is beneficial to reducing the incident angle of light after passing through the aperture STO, enabling more light to enter the optical lens 100 on the image side and improving the illuminance of the optical lens 100. The fifth lens L5 has a negative optical power, the object side S9 is concave, and the image side S10 is convex. The fifth lens L5 cooperates with the fourth lens L4, which is beneficial to correcting and balancing various aberrations, improving the resolution of the optical lens 100, and effectively reducing the tolerance sensitivity and enhancing the imaging quality of the optical system. The sixth lens L6 has a positive optical power, and both the object side S11 and the image side S12 are convex near the optical axis, which can converge light, reduce the overall optical length, and further achieve the miniaturized design of the optical lens 100. The seventh lens L7 has a negative optical power, the object side S13 is concave, and the image side S14 is convex, which can correct the astigmatism of the optical lens 100 and effectively control the light path at the same time to achieve a larger aperture. The seventh lens L7 cooperates with the sixth lens L6 to further balance aberrations and correct chromatic aberration, enhancing the imaging quality of the optical system. Through the specific surface shape combination and reasonable optical power distribution, the optical lens 100 can improve the imaging quality of the optical lens 100, reduce aberrations, and enhance the imaging quality of the optical lens 100, making the optical lens 100 have the characteristics of miniaturization, high pixel, and large field angle, and meeting the requirements of the autonomous driving assistance system.

[0064] In one embodiment, the optical lens 100 satisfies the relationship 5.5 ≤ TTL / F ≤ 6.8. By reasonably controlling the relationship between the overall optical length TTL and the focal length F of the optical lens 100, it is beneficial to achieve the miniaturization of the optical lens 100, improve the resolution, and reduce the lens sensitivity. At the same time, it can also make the optical lens 100 have a wide-angle characteristic.

[0065] In one embodiment, the optical lens 100 satisfies the relationship 1.3 ≤ F / IMGH ≤ 1.8, where F is the focal length of the optical lens 100. By reasonably configuring the ratio range of the focal length F of the optical lens 100 to the image height IMGH of the optical lens 100, it is beneficial to realize the miniaturization of the optical lens 100, improve the resolution ability, reduce the sensitivity of the optical lens 100, and at the same time enable the optical lens 100 to have a wide-angle characteristic.

[0066] In one embodiment, the optical lens 100 satisfies the relationship 1.5 ≤ FNO ≤ 1.6, where FNO is the f-number of the optical lens 100. By restricting the f-number FNO of the optical lens 100, it is possible to meet the large aperture required by the optical lens 100, increase the light input, make the illuminance of the optical lens 100 high, and enable it to have good imaging quality even in a relatively dark environment such as at night or on a rainy or cloudy day, meeting the requirements of a large aperture and high resolution.

[0067] In one embodiment, the optical lens 100 satisfies the relationship 1.9 ≤ R1 / R2 ≤ 3.5, where R1 is the curvature radius of the object side surface S1 of the first lens L1 on the optical axis, and R2 is the curvature radius of the image side surface S2 of the first lens L1 on the optical axis. By reasonably matching the ratio relationship between the curvature radii of the object side surface S1 and the image side surface S2 of the first lens L1 on the optical axis, the surface type difference of the first lens L1 is set reasonably, which is beneficial to controlling the shape of the first lens L1, correcting the aberration generated by itself, and improving the imaging quality.

[0068] In one embodiment, the optical lens 100 further satisfies the relational expressions: 0.5 ≤ R3 / R4 ≤ 0.65, -15 ≤ R5 / R6 ≤ -2, -2.1 ≤ R7 / R8 ≤ -0.8, 14 ≤ R10 / R9 ≤ 20, -1.6 ≤ R11 / R12 ≤ -0.6, 1.7 ≤ R14 / R13 ≤ 2.6, 1.0 ≤ R15 / R16 ≤ 4.0. Wherein, R3 is the curvature radius of the object side surface S3 of the second lens L2 at the optical axis, R4 is the curvature radius of the image side surface S4 of the second lens L2 at the optical axis, R5 is the curvature radius of the object side surface S5 of the third lens L3 at the optical axis, R6 is the curvature radius of the image side surface S6 of the third lens L3 at the optical axis, R7 is the curvature radius of the object side surface S7 of the fourth lens L4 at the optical axis, R8 is the curvature radius of the image side surface S8 of the fourth lens L4 at the optical axis, R9 is the curvature radius of the object side surface S9 of the fifth lens L5 at the optical axis, R10 is the curvature radius of the image side surface S10 of the fifth lens L5 at the optical axis, R11 is the curvature radius of the object side surface S11 of the sixth lens L6 at the optical axis, R12 is the curvature radius of the image side surface S12 of the sixth lens L6 at the optical axis, R13 is the curvature radius of the object side surface S13 of the seventh lens L7 at the optical axis, R14 is the curvature radius of the image side surface S14 of the seventh lens L7 at the optical axis, R15 is the curvature radius of the object side surface S15 of the eighth lens L8 at the optical axis, and R16 is the curvature radius of the image side surface S16 of the eighth lens L8 at the optical axis.

[0069] By reasonably matching the ratio relationship between the curvature radii of the object side surface and the image side surface of each lens at the optical axis, the surface type differences of each lens are reasonably set, which is beneficial to controlling the shape of each lens, correcting the aberration generated by itself, and improving the imaging quality.

[0070] In one embodiment, the optical lens 100 further satisfies the relational expression: -0.9 ≤ (R9 - R10) / (R9 + R10) ≤ -0.85. By reasonably matching the ratio relationship between the curvature radii of the object side surface S9 and the image side surface S10 of the fifth lens L5 at the optical axis, the surface type of the fifth lens L5 can be reasonably set, which is beneficial to controlling the shape of the fifth lens L5, correcting the aberration generated by itself, and improving the imaging quality.

[0071] In one embodiment, the curvature radius R4 of the image side surface S4 of the second lens L2 at the optical axis and the curvature radius R5 of the object side surface S5 of the third lens L3 at the optical axis further satisfy the relational expression: -3.0 ≤ R5 / R4 ≤ -1.3. By appropriately controlling the curvature radius R4 of the image side surface S4 of the second lens L2 on the optical axis and the curvature radius R5 of the object side surface S5 of the third lens L3 on the optical axis within a certain range, the aberration of the optical lens 100 can be corrected and the light passing through the lens can be made gentle, thereby improving the imaging stability of the optical lens 100.

[0072] In one embodiment, the optical lens 100 satisfies the relation -1.4 ≤ F / R3 ≤ -0.9. By appropriately increasing the curvature radius of the object side surface S3 of the second lens L2 on the optical axis within a certain range, the convex surface can face the image side, further converge the light, suppress the peripheral field of view, and thus improve the imaging quality of the optical lens 100.

[0073] In one embodiment, the optical lens 100 satisfies the relation 1.1 ≤ CT3 / ET3 ≤ 1.45. CT3 is the thickness of the third lens L3 on the optical axis, and ET3 is the distance in the optical axis direction from the maximum effective aperture of the object side surface S5 of the third lens L3 to the maximum effective aperture of the image side surface S6 of the third lens L3. In this way, the thickness ratio of the third lens L3 can be reasonably controlled, thereby optimizing the surface shape of the third lens L3, facilitating the effective convergence of large-angle incident light, and enabling the light passing through the third lens L3 to have a small deflection angle, so as to reduce the generation of stray light and further ensure good imaging performance.

[0074] In one embodiment, the optical lens 100 also satisfies the relation -6.0 ≤ F1 / CT1 ≤ -2.2. F1 is the focal length of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis. In this way, the relationship between the focal length F1 and the thickness CT1 of the first lens L1 can be reasonably restricted, facilitating aberration correction and contributing to improving the assembly yield of the optical lens 100.

[0075] In one embodiment, the optical lens 100 satisfies the relation 1.8 ≤ F4 / CT4 ≤ 3.8. F4 is the focal length of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis. By reasonably controlling the relationship between the focal length F4 and the thickness CT4 of the fourth lens L4, the focal length F4 of the fourth lens L4 will not be too large, facilitating aberration correction, and reducing the tolerance sensitivity of the fourth lens L4 and the processing difficulty of the manufacturing process, which is beneficial to improving the assembly yield of the optical lens 100.

[0076] In one embodiment, the optical lens 100 satisfies the relation 2.8 ≤ F6 / CT6 ≤ 3.7. F6 is the focal length of the sixth lens L6, and CT6 is the thickness of the sixth lens L6 on the optical axis. By reasonably controlling the relationship between the focal length F6 and the thickness CT6 of the sixth lens L6, the focal length F6 of the sixth lens L6 will not be too large, facilitating aberration correction, and reducing the tolerance sensitivity of the sixth lens L6 and the processing difficulty of the manufacturing process, which is beneficial to improving the assembly yield of the optical lens 100.

[0077] In one embodiment, the fourth lens L4 and the fifth lens L5 form a cemented lens, that is, the image side surface S8 of the fourth lens L4 is cemented to the object side surface S9 of the fifth lens L5, and the combined focal length of the cemented lens is F45. The combined focal length F45 of the cemented lens and the focal length F of the optical lens 100 satisfy the relation 3.9 ≤ F45 / F ≤ 12. By reasonably matching the focal length F45 of the cemented lens formed by the fourth lens L4 and the fifth lens L5, it is beneficial to correct chromatic aberration and balance various aberrations, improve the resolution ability, and can effectively reduce the tolerance sensitivity and improve the imaging quality of the optical lens 100.

[0078] In one embodiment, the optical lens satisfies the relation -1.3 mm ≤ (F6 / Vd6) + (F7 / Vd7) ≤ -0.5 mm, where F6 is the focal length of the sixth lens L6, Vd6 is the Abbe number of the sixth lens L6, F7 is the focal length of the seventh lens L7, and Vd7 is the Abbe number of the seventh lens L7. By reasonably controlling the sum of the ratio of the focal length F6 to the Abbe number Vd6 of the sixth lens L6 and the ratio of the focal length F7 to the Abbe number Vd7 of the seventh lens L7, the chromatic dispersion of the optical lens 100 can be effectively offset, which is beneficial to achieving confocal for both visible light and infrared bands.

[0079] In one embodiment, the sixth lens L6 and the seventh lens L7 form a cemented lens, that is, the image side surface S12 of the sixth lens L6 is cemented to the object side surface S13 of the seventh lens L7, and the combined focal length of the cemented lens is F67. The combined focal length F67 of the cemented lens and the focal length F of the optical lens 100 satisfy the relation 2.3 ≤ F67 / F ≤ 3.3. Reasonably matching the focal length of the cemented lens is beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolution ability, and can effectively reduce the tolerance sensitivity and improve the imaging quality of the optical lens 100.

[0080] In one embodiment, the optical lens 100 satisfies the relation -7 ≤ F7 / F ≤ -3, where F7 is the focal length of the seventh lens L7. By reasonably configuring the focal length of the seventh lens L7, it is beneficial to correct the aberration of the optical lens 100 and improve the imaging quality.

[0081] In one embodiment, the optical lens 100 also satisfies the relations -2.4 ≤ F1 / F ≤ -1.7, -6.5 ≤ F2 / F ≤ -3.0, 1.8 ≤ F3 / F ≤ 3.5, 1.3 ≤ F4 / F ≤ 1.6, -2.5 ≤ F5 / F ≤ -1.3, 1.4 ≤ F6 / F ≤ 1.8, |F8 / F| ≥ 3. Wherein, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, F5 is the focal length of the fifth lens L5, and F8 is the focal length of the eighth lens L8. Satisfying the above relations can make the distribution of optical power uniform and reasonable, the aberration easy to correct, and the image quality perform well.

[0082] In one embodiment, the optical lens 100 satisfies the relation 1.5 ≤ SD1 / IMGH ≤ 2.0, where SD1 is the maximum effective semi-aperture of the object side S1 of the first lens L1. By reasonably controlling the size of the maximum effective aperture of the object side S1 of the first lens L1, it is beneficial to achieve the miniaturized design of the optical lens 100.

[0083] In one embodiment, the optical lens 100 satisfies the relation 1.55 ≤ SD1 / SD16 ≤ 1.95, where SD16 is the maximum effective semi-aperture of the image side S16 of the eighth lens L8. By reasonably controlling the ratio of the maximum effective semi-aperture of the object side S1 of the first lens L1 to the maximum effective semi-aperture of the image side S16 of the eighth lens L8, the optical lens 100 has the characteristic of a small aperture, can effectively converge the light rays, and enables the light rays to better enter the imaging surface of the optical lens 100.

[0084] In one embodiment, the optical lens 100 satisfies the relation 1.0 ≤ SD6 / SD7 ≤ 1.25, where SD6 is the maximum effective semi-aperture of the image side S6 of the third lens L3, and SD7 is the maximum effective semi-aperture of the object side S7 of the fourth lens L4. In this way, the fourth lens L4 has the characteristic of a small aperture, can effectively converge the light rays of the third lens L3, and enables the light rays to better enter the imaging surface of the optical lens 100.

[0085] In one embodiment, the optical lens 100 satisfies the relation 8.0°·mm -1 ≤ FOV / F ≤ 13.0°·mm -1 , by reasonably controlling the ratio range between the maximum field of view FOV and the focal length F of the optical lens 100, it helps to ensure the low sensitivity of the optical lens 100. At the same time, it also helps to achieve a smaller principal ray angle, a long back focal length, and a high resolution.

[0086] In one embodiment, the optical lens 100 satisfies the relation 25mm ≤ TTL*IMGH / F ≤ 32mm. This relation reflects the constraint situation of the optical lens 100 in terms of the characteristics of the target surface size and volume. When this relation is satisfied, it can meet the requirement of the fixed-focus lens to adapt to a large-size imaging surface (imaging chip), meet the market demand for the miniaturization of the fixed-focus lens, and enable the fixed-focus lens to meet the market demands of both a large target surface and miniaturization.

[0087] In one embodiment, the optical lens 100 satisfies the relationship 42° ≤ FOV / FNO ≤ 54°. By reasonably controlling the relationship between the field of view FOV and the f-number FNO of the optical lens 100, a reasonable field of view FOV and f-number FNO are provided for the optical lens 100, which can balance the design difficulty and the requirement of the field of view. At the same time, the aperture can be varied within a reasonable range to provide a combined effect of a large viewing angle and a large aperture, meeting the characteristics of the optical lens 100 having a large aperture, high relative illumination, and small distortion.

[0088] In one embodiment, the optical lens 100 satisfies the relationship 1.9 ≤ ∑CT / ∑AT ≤ 2.3, where ∑CT is the sum of the thicknesses of all the lenses on the optical axis from the first lens L1 to the eighth lens L8, and ∑AT is the sum of the air gaps between adjacent lenses from the first lens L1 to the eighth lens L8. By reasonably controlling the ratio relationship between the sum of the thicknesses of all the lenses on the optical axis and the sum of the air gaps between adjacent lenses from the first lens L1 to the eighth lens L8, the overall structure of the optical lens 100 is made more compact, which is beneficial to shortening the total length of the optical lens 100, thereby realizing the miniaturization of the optical lens 100.

[0089] In one embodiment, the optical lens 100 satisfies the relationship 0.4 ≤ BFL / F ≤ 0.54, where BFL is the distance on the optical axis from the image side S16 of the eighth lens L8 to the imaging surface SI of the optical lens 100. This is beneficial to achieving a balance between good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical lens 100, it can avoid interference between the optical lens 100 and other components, and reduce the assembly process difficulty of the camera module equipped with the optical lens 100.

[0090] Example 1 Figure 1Schematic structural diagram of the optical lens 100 disclosed in Embodiment 1 of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter 110, and a protective glass 120, which are sequentially arranged along the optical axis from the object side to the image side. Among them, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 of the first lens L1 is concave near the optical axis; the object side surface S3 of the second lens L2 is concave near the optical axis, and the image side surface S4 of the second lens L2 is convex near the optical axis; the object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 of the third lens L3 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is convex near the optical axis, and the image side surface S8 of the fourth lens L4 is convex near the optical axis; the object side surface S9 of the fifth lens L5 is concave near the optical axis, and the image side surface S10 of the fifth lens L5 is convex near the optical axis; the object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S12 of the sixth lens L6 is convex near the optical axis; the object side surface S13 of the seventh lens L7 is concave near the optical axis, and the image side surface S14 of the seventh lens L7 is convex near the optical axis; the eighth lens L8 has a positive refractive power, the object side surface S15 of the eighth lens L8 is convex near the optical axis, and the image side surface S16 of the eighth lens L8 is concave near the optical axis. Among them, the fourth lens L4 and the fifth lens L5 are cemented, and the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 can be regarded as the same surface; the sixth lens L6 and the seventh lens L7 are cemented, and the image side surface S12 of the sixth lens L6 and the object side surface S13 of the seventh lens L7 can be regarded as the same surface.

[0091] Specifically, taking the focal length F = 7.03 mm of the optical lens 100, the aperture number FNO = 1.503 of the optical lens 100, and the maximum field of view angle FOV = 76° of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 1 below. Among them, the components along the optical axis of the optical lens 100 from the object side to the image side are arranged in the order of the components in Table 1 from top to bottom. In the same lens, the surface with a smaller surface number is the object side surface of the lens, and the surface with a larger surface number is the image side surface of the lens. For example, surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1 respectively. The Y radius in Table 1 is the curvature radius of the object side surface or the image side surface with the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis. The value in the "thickness" parameter column of the aperture stop 102 is the distance from the aperture stop 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis. By default, the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop 102 is set on the image side of the vertex of the next surface. If the thickness of the aperture stop 102 is positive, the aperture stop 102 is on the object side of the vertex of the next surface. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, Abbe number, etc. in Table 1 are all obtained under the reference wavelength of 587.5618 nm, and the focal length is obtained under the reference wavelength of 555 nm.

[0092] Table 1

[0093] In Embodiment 1, the object side surface S3 and the image side surface S4 of the second lens L2, and the object side surface S15 and the image side surface S16 of the eighth lens L8 are all aspherical surfaces. Then, the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula: ; where x is the sagitta, the distance from the vertex of the aspherical surface at the position with a height of h along the optical axis direction; c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (that is, the paraxial curvature c is the reciprocal of the curvature radius Y in Table 1 above); K is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces of the third lens L3 and the seventh lens L7.

[0094] Table 2

[0095] Figure 2 are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical lens 100 disclosed in Embodiment 1 of the present application.Figure 2 Among them, (A) is the spherical aberration diagram of the optical lens 100 at wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, 650 nm, 800 nm, 830 nm, 850 nm, 870 nm, and 900 nm. Among them, the abscissa along the X-axis direction represents the focus shift, with the unit of mm, and the ordinate along the Y-axis direction represents the normalized field of view. From Figure 2 As can be seen from (A) in

[0096] Figure 2 Among them, (B) is the ray astigmatism diagram of the optical lens 100 in Embodiment 1 at a wavelength of 555 nm. Among them, the abscissa along the X-axis direction represents the focus shift, with the unit of mm, and the ordinate along the Y-axis direction represents the field angle, with the unit of °. In the astigmatism diagram, T represents the curvature of the imaging surface SI in the meridional direction, and S represents the curvature of the imaging surface SI in the sagittal direction. From Figure 2 As can be seen from (B) in

[0097] Figure 2 Among them, (C) is the distortion diagram of the optical lens 100 in Embodiment 1 at a wavelength of 555 nm. Among them, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the field angle, with the unit of °. From Figure 2 As can be seen from (C) in

[0098] Embodiment 2 Figure 3 This is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 2 of the present application. The surface type of the lens and the refractive power of the lens of the optical lens 100 in Embodiment 2 are roughly the same as the positive and negative combinations of the surface type of the lens and the refractive power of the lens of the optical lens 100 in Embodiment 1. The main difference is that the eighth lens L8 has a negative refractive power.

[0099] Specifically, taking the focal length F = 7.05 mm of the optical lens 100, the aperture number FNO = 1.6 of the optical lens 100, and the maximum field of view angle FOV = 76° of the optical lens 100 as examples, the other parameters of the optical lens 100 are given in Table 3 below. The definitions of the parameters can be obtained from the descriptions of the foregoing embodiments and will not be elaborated here. The refractive index, Abbe number, etc. in Table 2 are obtained at the reference wavelength of 587.5618 nm, and the focal length is obtained at the reference wavelength of 555 nm. In addition, for the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to the description in the foregoing Embodiment 1 and will not be elaborated here.

[0100] Table 3

[0101] Table 4 gives the high-order term coefficients of the aspherical surfaces of the second lens L2 and the eighth lens L8 that can be used in Embodiment 2. Among them, the aspherical surface types can be defined by the formulas given in Embodiment 1.

[0102] Table 4

[0103] Please refer to Figure 4 , from Figure 4 in the (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 in this embodiment has good imaging quality. In addition, regarding Figure 4 in (A), Figure 4 in (B), and Figure 4 in (C), the wavelengths corresponding to the curves can refer to the content described in (A), Figure 2 in (B), Figure 2 in (C), Figure 2 in (C) in Embodiment 1 and will not be elaborated here.

[0104] Embodiment 3 Figure 5 This is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 3 of the present application. The surface types of the lenses and the positive and negative combinations of the refractive powers of the lenses in the optical lens 100 in Embodiment 3 are the same as those of the lenses in the optical lens 100 in Embodiment 1 and will not be elaborated here.

[0105] Specifically, taking the focal length F = 7.03 mm of the optical lens 100, the aperture number FNO = 1.503 of the optical lens 100, and the maximum field of view angle FOV = 76° of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 5 below. The definitions of each parameter can be obtained from the descriptions in the foregoing embodiments and will not be elaborated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at the reference wavelength of 587.5618 nm, and the focal length is obtained at the reference wavelength of 555 nm. In addition, regarding the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to that described in the foregoing Embodiment 1 and will not be elaborated here.

[0106] Table 5

[0107] Table 6 gives the high-order term coefficients of the aspherical mirror surfaces of the second lens L2 and the eighth lens L8 that can be used in Embodiment 3. Among them, each aspherical surface type can be defined by the formula given in Embodiment 1.

[0108] Table 6

[0109] Please refer to Figure 6 , from Figure 6 's (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding Figure 6 's (A), Figure 6 's (B), and Figure 6 's (C), the wavelengths corresponding to the curves can refer to the content described in Embodiment 1 regarding Figure 2 's (A), Figure 2 's (B), Figure 2 's (C), and will not be elaborated here.

[0110] Embodiment 4 Figure 7 is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 4 of the present application. In Embodiment 4, the surface type of the lens of the optical lens 100 and the positive and negative combinations of the refractive power of the lens are substantially the same as those of the lens of the optical lens 100 in Embodiment 1. The main difference is that the eighth lens L8 has a negative refractive power.

[0111] Specifically, taking the focal length F = 7.99 mm of the optical lens 100, the f-number FNO = 1.502 of the optical lens 100, and the maximum field of view angle FOV = 65° of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 7 below. The definitions of each parameter can be obtained from the descriptions of the foregoing embodiments and will not be elaborated here. The refractive index, Abbe number, etc. in Table 7 are obtained under the reference wavelength of 587.5618 nm, and the focal length is obtained under the reference wavelength of 555 nm. In addition, regarding the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to the description in the foregoing Embodiment 1 and will not be elaborated here.

[0112] Table 7

[0113] Table 8 gives the high-order term coefficients of the aspherical mirror surfaces of the second lens L2 and the eighth lens L8 that can be used in Embodiment 4. Among them, each aspherical surface type can be defined by the formula given in Embodiment 1.

[0114] Table 8

[0115] Please refer to Figure 8 , from Figure 8 in the (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding Figure 8 in (A), Figure 8 in (B), and Figure 8 in (C), the wavelengths corresponding to the curves can refer to the content described in (A), Figure 2 in (B), Figure 2 in (C), Figure 2 in (C) in Embodiment 1 and will not be elaborated here.

[0116] Embodiment 5 Figure 9 is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 5 of the present application. In Embodiment 5, the surface type of the lens of the optical lens 100 and the positive and negative combinations of the refractive powers of the lenses are substantially the same as those of the optical lens 100 in Embodiment 1. The main difference is that the eighth lens L8 has a negative refractive power.

[0117] Specifically, taking the focal length F = 6.15 mm of the optical lens 100, the aperture number FNO = 1.508 of the optical lens 100, and the maximum field of view angle FOV = 80° of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 9 below. The definitions of each parameter can be obtained from the descriptions in the foregoing embodiments and will not be elaborated here. The refractive index, Abbe number, etc. in Table 9 are obtained under the reference wavelength of 587.5618 nm, and the focal length is obtained under the reference wavelength of 555 nm. In addition, regarding the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to the description in the foregoing Embodiment 1 and will not be elaborated here.

[0118] Table 9

[0119] Table 10 gives the high-order term coefficients of each aspherical mirror surface of the second lens L2 and the eighth lens L8 that can be used in Embodiment 5, where each aspherical surface type can be defined by the formula given in Embodiment 1.

[0120] Table 10

[0121] Please refer to Figure 10 , from Figure 10 in the (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 in this embodiment has good imaging quality. In addition, regarding Figure 8 in (A), Figure 8 in (B), and Figure 8 in (C), the wavelengths corresponding to each curve can refer to the content described in (A), Figure 2 in (B), Figure 2 in (C), Figure 2 in (C) in Embodiment 1 and will not be elaborated here.

[0122] Embodiment 6 Figure 11 is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 5 of the present application. The surface types of the lenses of the optical lens 100 in Embodiment 6 and the positive and negative combinations of the refractive powers of the lenses are the same as those of the lenses of the optical lens 100 in Embodiment 1 and will not be elaborated here.

[0123] Specifically, taking the focal length F = 7.03 mm of the optical lens 100, the aperture number FNO = 1.502 of the optical lens 100, and the maximum field of view angle FOV = 76° of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 11 below. The definitions of the parameters can be obtained from the descriptions in the foregoing embodiments and will not be elaborated here. The refractive index, Abbe number, etc. in Table 11 are obtained under the reference wavelength of 587.5618 nm, and the focal length is obtained under the reference wavelength of 555 nm. In addition, regarding the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to Embodiment 1 described above and will not be elaborated here.

[0124] Table 11

[0125] Table 12 gives the high-order term coefficients of the aspherical surfaces of the second lens L2 and the eighth lens L8 that can be used in Embodiment 6. Among them, each aspherical surface type can be defined by the formula given in Embodiment 1.

[0126] Table 12

[0127] Please refer to Figure 12 , from Figure 12 in the (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 in this embodiment has good imaging quality. In addition, regarding Figure 12 in (A), Figure 12 in (B), and Figure 12 in (C), the wavelengths corresponding to the curves can refer to the content described in Embodiment 1 regarding Figure 2 in (A), Figure 2 in (B), Figure 2 in (C), and will not be elaborated here.

[0128] Embodiment 7 Figure 13 This is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 7 of the present application. The surface types of the lenses and the positive and negative combinations of the refractive powers of the lenses in the optical lens 100 in Embodiment 7 are the same as those of the lenses in the optical lens 100 in Embodiment 1 and will not be elaborated here.

[0129] Specifically, taking the focal length F = 7.04 mm of the optical lens 100, the aperture number FNO = 1.502 of the optical lens 100, and the maximum field of view angle FOV = 76° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in Table 9 below. And the definitions of each parameter can be obtained from the descriptions of the foregoing embodiments, which will not be elaborated here. The refractive index, Abbe number, etc. in Table 13 are all obtained at the reference wavelength of 587.5618 nm, and the focal length is obtained at the reference wavelength of 555 nm. In addition, regarding the correspondence between the surface numbers of each lens and the object side and image side of each lens, please refer to the description in Embodiment 1 above, which will not be elaborated here.

[0130] Table 13

[0131] Table 14 gives the high-order term coefficients of each aspherical mirror surface of the second lens L2 and the eighth lens L8 that can be used in Embodiment 7. Among them, each aspherical surface type can be defined by the formula given in Embodiment 1.

[0132] Table 14

[0133] Please refer to Figure 14 , from Figure 14 in the (A) spherical aberration diagram, (B) ray astigmatism diagram, and (C) distortion diagram, it can be seen that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 in this embodiment has good imaging quality. In addition, regarding Figure 14 in (A), Figure 14 in (B), and Figure 14 in (C), the wavelengths corresponding to each curve can refer to the content described in (A), Figure 2 in (B), Figure 2 in (C), Figure 2 in Embodiment 1, which will not be elaborated here.

[0134] Please refer to Table 15. Table 15 is a summary of the ratios of each relational expression in Embodiments 1 to 7 of this application.

[0135] Table 15

[0136] Please refer to Figure 15, the present application also discloses an imaging module 200, which includes an image sensor 201 and the optical lens 100 described in any one of the above embodiments 1 to 7. The image sensor 201 is disposed on the image side of the optical lens 100. Specifically, the photosensitive surface of the image sensor 201 is located on the imaging surface 101 of the optical lens 100, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The image sensor 201 can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge Coupled Device (CCD). The imaging module 200 can be an imaging module integrated on the terminal device 300 or an independent lens. It can be understood that the imaging module 200 having the above optical lens 100 has all the technical effects of the above optical lens 100, that is, the imaging module 200 can meet the requirements of a large field of view angle, a high relative illuminance, and a small-sized design. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0137] The present application also discloses a terminal device 300, which includes a housing 301 and the above imaging module 200. The imaging module 200 is disposed in the housing 301. Among them, the terminal device 300 can include, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a smart watch, a vehicle-mounted device, a drone, a monitor, etc. Please refer to Figure 16 , taking the terminal device 300 as a vehicle as an example, at this time the housing 301 can be a vehicle body, and the imaging module 200 can be disposed on the vehicle body, for example, it can be disposed inside or outside the vehicle body.

[0138] It can be understood that the terminal device 300 having the above imaging module 200 also has all the technical effects of the above optical lens 100. That is, the terminal device 300 can meet the requirements of a large field of view angle, a high relative illuminance, and a small-sized design. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0139] The above has introduced the optical lens, imaging module and terminal device disclosed in the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the optical lens, imaging module and terminal device of the present application and their core ideas; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An optical lens, characterized in that, There are a total of eight lenses with refractive power, and the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis; The first lens has negative refractive power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; The second lens has negative refractive power, the object side surface of the second lens is concave near the optical axis, and the image side surface of the second lens is convex near the optical axis; The third lens has positive refractive power, and both the object side surface and the image side surface of the third lens are convex near the optical axis; The fourth lens has positive refractive power, and both the object side surface and the image side surface of the fourth lens are convex near the optical axis; The fifth lens has negative refractive power, the object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; The sixth lens has positive refractive power, and both the object side surface and the image side surface of the sixth lens are convex near the optical axis; The seventh lens has negative refractive power, the object side surface of the seventh lens is concave near the optical axis, and the image side surface of the seventh lens is convex near the optical axis; The object side surface of the eighth lens is convex near the optical axis, and the image side surface of the eighth lens is concave near the optical axis; The optical lens satisfies the following relational expressions: 65°≤FOV≤80° and 7.8≤TTL / IMGH≤10.5; where, FOV is the maximum field of view angle of the optical lens, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 5.5≤TTL / F≤6.8, and / or, 1.3≤F / IMGH≤1.8, and / or, 1.5≤FNO≤1.6; where, F is the focal length of the optical lens, and FNO is the f-number of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 1.9≤R1 / R2≤3.5, and / or, -1.4≤F / R3≤-0.9; where, R1 is the radius of curvature of the object side surface of the first lens on the optical axis, R2 is the radius of curvature of the image side surface of the first lens on the optical axis, F is the focal length of the optical lens, and R3 is the radius of curvature of the object side surface of the second lens on the optical axis.

4. The optical lens according to claim 1, wherein The optical lens satisfies the following relational expressions: -3.0≤R5 / R4≤-1.3, and / or, 1.1≤CT3 / ET3≤1.45, and / or, -0.9≤(R9 - R10) / (R9 + R10)≤-0.85; Wherein, R5 is the radius of curvature of the object side surface of the third lens at the optical axis, R4 is the radius of curvature of the image side surface of the second lens at the optical axis, CT3 is the thickness of the third lens on the optical axis, ET3 is the distance in the optical axis direction from the maximum effective aperture of the object side surface of the third lens to the maximum effective aperture of the image side surface of the third lens, R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis.

5. The optical lens according to claim 1, wherein, The optical lens satisfies the following relational expressions: -6.0 ≤ F1 / CT1 ≤ -2, and / or, 1.8 ≤ F4 / CT4 ≤ 3.8, and / or, 2.8 ≤ F6 / CT6 ≤ 3.7; Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F4 is the focal length of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, F6 is the focal length of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis.

6. The optical lens according to claim 1, wherein The image side surface of the fourth lens is cemented to the object side surface of the fifth lens, and the image side surface of the sixth lens is cemented to the object side surface of the seventh lens. The optical lens satisfies the following relational expressions: 3.9 ≤ F45 / F ≤ 12, and / or, -1.3 mm ≤ (F6 / Vd6) + (F7 / Vd7) ≤ -0.5 mm, and / or, 2.3 ≤ F67 / F ≤ 3.3, and / or, -7 ≤ F7 / F ≤ -3; Wherein, F45 is the combined focal length of the fourth lens and the fifth lens, F is the focal length of the optical lens, F6 is the focal length of the sixth lens, Vd6 is the Abbe number of the sixth lens, F7 is the focal length of the seventh lens, Vd7 is the Abbe number of the seventh lens, and F67 is the combined focal length of the sixth lens and the seventh lens.

7. The optical lens according to claim 1, wherein The optical lens satisfies the following relational expressions: 1.5 ≤ SD1 / IMGH ≤ 2.0, and / or, 1.55 ≤ SD1 / SD16 ≤ 1.95, and / or, 1.0 ≤ SD6 / SD7 ≤ 1.25; Wherein, SD1 is the maximum effective semi-aperture of the object side surface of the first lens, SD16 is the maximum effective semi-aperture of the image side surface of the eighth lens, SD6 is the maximum effective semi-aperture of the image side surface of the third lens, and SD7 is the maximum effective semi-aperture of the object side surface of the fourth lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 8.0°·mm-1 ≤ FOV / F ≤ 13.0°·mm-1, and / or, 25 mm ≤ TTL*IMGH / F ≤ 32 mm, and / or, 42° ≤ FOV / FNO ≤ 54°, and / or, 1.9 ≤ ∑CT / ∑AT ≤ 2.3; Wherein, F is the focal length of the optical lens, FNO is the aperture number of the optical lens, ∑CT is the sum of the thicknesses of all the lenses from the first lens to the eighth lens on the optical axis, and ∑AT is the sum of the air gaps between adjacent lenses from the first lens to the eighth lens.

9. An imaging module, characterized in that, The imaging module includes an image sensor and an optical lens as described in any one of claims 1-8, and the image sensor is disposed on the image side of the optical lens.

10. A terminal device, characterized in that, It includes the imaging module as described in claim 9.

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