Optical lens, camera module and terminal device

Abstract

The application discloses an optical lens, a camera module and a terminal device. The optical lens comprises eight lenses with refractive power. The first lens has refractive power, and the object side and the image side are concave and convex respectively. The second lens has positive refractive power, and the object side and the image side are convex and concave respectively. The third lens has refractive power. The fourth lens has positive refractive power, and the image side is convex. The fifth lens has negative refractive power, and the object side and the image side are concave and convex respectively. The sixth lens has negative refractive power, and the object side and the image side are concave and convex respectively. The seventh lens has positive refractive power, and the object side and the image side are both convex. The eighth lens has negative refractive power, and the object side and the image side are convex and concave respectively. The optical lens satisfies the relationship 45deg < HFOV < 52deg. The optical lens, the camera module and the terminal device provided by the application can meet the design requirements of miniaturization and have good imaging quality.

Description

Technical Field

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

[0002] With the development of terminal device technology (such as smartphones and tablets), the demand for miniaturization and thinner designs in these devices is increasing. This necessitates that optical lenses used in these devices also possess miniaturized and thinner designs to adapt to the requirements of these devices. Simultaneously, as users pursue higher photographic performance, the requirements for image resolution and low distortion control of optical lenses are also increasing. Therefore, there is an urgent need to design an optical lens that can simultaneously meet the requirements of miniaturization and provide excellent image quality. Summary of the Invention

[0003] This application discloses an optical lens, a camera module, and a terminal device that can achieve good imaging quality while meeting the requirements of miniaturization.

[0004] To achieve the above objectives, in a first aspect, this application discloses an optical lens comprising eight lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side.

[0005] The first lens has refractive power, the object side of the first lens is concave near the optical axis, and the image side of the first lens is convex near the optical axis.

[0006] The second lens has positive refractive power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis;

[0007] The third lens has refractive power;

[0008] The fourth lens has positive refractive power, and the image-side surface of the fourth lens is convex near the optical axis.

[0009] The fifth lens has negative refractive power, the object side of the fifth lens is concave near the optical axis, and the image side of the fifth lens is convex near the optical axis.

[0010] The sixth lens has negative refractive power, the object side of the sixth lens is concave near the optical axis, and the image side of the sixth lens is convex near the optical axis.

[0011] The seventh lens has positive refractive power, and both the object-side and image-side surfaces of the seventh lens are convex near the optical axis.

[0012] The eighth lens has negative refractive power, 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.

[0013] The optical lens satisfies the following relationship:

[0014] 45deg <HFOV<52deg;

[0015] HFOV is half of the maximum field of view of the optical lens.

[0016] In the optical lens provided in this application, in order to achieve good image quality while meeting the requirements of miniaturization, the refractive power and surface shape of the eight lenses are rationally configured. Specifically, the object-side and image-side surfaces of the first lens are designed to be concave and convex near the optical axis, respectively, allowing more light to enter the first lens. The second lens has positive refractive power, and its object-side surface is convex near the optical axis while its image-side surface is concave near the optical axis, which helps to achieve better light convergence while reducing the aperture of the optical lens. The third lens has refractive power, which allows for a reasonable distribution of the optical power of the optical lens, preventing excessive concentration of optical power on one or two lenses. The fourth lens has positive refractive power, and its image-side surface is convex near the optical axis, which reduces the exit angle of peripheral light rays. The fifth lens has negative refractive power, and its object-side and image-side surfaces are concave and convex near the optical axis, respectively, which helps to improve spherical aberration of the optical lens, giving the optical lens better aberration correction capabilities. The sixth lens has negative refractive power, and its object-side and image-side surfaces are concave and convex near the optical axis, respectively. This also helps to improve spherical aberration and further enhance the aberration correction capability of the optical lens. The seventh lens has positive refractive power, and its object-side and image-side surfaces are convex near the optical axis. This provides positive refractive power to the optical lens, helping to balance the refractive power of the lens. It also improves the light-gathering ability of the optical lens and helps to correct coma, resulting in good image quality. The eighth lens provides negative refractive power, and its object-side and image-side surfaces are convex and concave near the optical axis, respectively. This allows more light to converge onto the image plane, thereby improving the image resolution and ultimately enhancing the image quality of the optical lens.

[0017] Furthermore, among the eight lenses, multiple lenses can be made into convex-concave lenses, concave-convex lenses, or biconvex lenses. This allows for better control of the thickness of the corresponding lenses, thereby reducing the overall length of the optical lens and enabling it to meet the requirements of miniaturization design.

[0018] Furthermore, when the optical lens satisfies the relational expression: 45deg<HFOV<52deg, the field of view of the optical lens can be controlled within a reasonable range, so that the optical lens has a wide-angle function.

[0019] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0020] 1.2<f2 / f<3.0; and / or, 5<|f1| / f<40; and / or, 9<|f3| / f<72; and / or, -3.0<f12 / f56<-1.0;

[0021] wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f is the focal length of the optical lens, f12 is the combined focal length of the first lens and the second lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

[0022] By defining the ratio of the focal length of the second lens to the focal length of the optical lens, that is, defining the ratio of f2 / f, the positive refractive power of the second lens can be reasonably configured to have appropriate positive refractive power, which is beneficial to enhancing the light converging ability of the optical lens, reducing the aberration of the optical lens, and thus helping to improve the imaging quality.

[0023] By defining the ratio of |f1| / f, the refractive power of the first lens can be reasonably distributed, which is beneficial to the wide-angle and miniaturized characteristics of the optical lens. That is, when the first lens provides negative refractive power, it is beneficial to expand the field of view of the optical lens, and when the first lens provides positive refractive power, it is beneficial to shorten the total length of the optical lens to realize its miniaturization characteristic.

[0024] By defining the ratio of |f3| / f, the trend of light after entering the optical lens can be effectively smoothed, which is conducive to the convergence of marginal light with a large viewing angle. When the third lens provides positive refractive power, it can make up for the deficiency of the positive refractive power of the fourth lens, reduce the sensitivity of the optical lens, and improve the imaging quality. When the third lens provides negative refractive power, it can further expand the field of view of the optical lens to realize the wide-angle function.

[0025] When the optical lens satisfies the relational expression -3.0<f12 / f56<-1.0, since the front lens group composed of the first lens and the second lens has positive refractive power, the light focusing ability of the optical lens can be enhanced, which is beneficial to shortening the total length of the optical lens, so that it further meets the miniaturization design requirements. At the same time, the rear lens group composed of the fifth lens and the sixth lens has negative refractive power, which can further expand the field of view of the optical lens, and simultaneously balance and offset the spherical aberration brought by the front lens group, so that the optical lens can achieve good imaging quality.

[0026] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expression:

[0027] -5.0<(R11+R12) / (R11-R12)<-1.0; and / or, -15<R14 / R13<0;

[0028] Wherein, R11 is the radius of curvature of the object side surface of the sixth lens at the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis, R13 is the radius of curvature of the object side surface of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis.

[0029] When the optical lens satisfies the relational expression -5.0<(R11+R12) / (R11-R12)<-1.0, the surface shape of the sixth lens can be effectively controlled, so that on the one hand, it is not only beneficial to moderate the deflection degree of light passing through the sixth lens and reduce aberrations; on the other hand, it is also beneficial to the processing and molding of the sixth lens, making it easy to process.

[0030] When the optical lens satisfies the relational expression -15<R14 / R13<0, the radii of curvature of the object side surface and the image side surface of the seventh lens near the optical axis can be controlled within a reasonable range, thereby effectively avoiding excessive bending of the seventh lens at the optical axis, improving the machinability of the seventh lens, and also helping to reduce the imaging sensitivity of the optical lens. In addition, satisfying this relational expression can also effectively reduce the angle of light entering the image sensor after passing through the seventh lens and the eighth lens, thereby reducing the coma aberration of the optical lens and helping to improve the imaging quality of the optical lens.

[0031] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expression:

[0032] 1.5<tan(HFOV)*TTL / Imgh<1.8, and / or, -3.5<f6 / f7<-1;

[0033] Wherein, HFOV is half of 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 plane of the optical lens, Imgh is half of the image height corresponding to the maximum field of view angle of the optical lens; f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

[0034] When the optical lens satisfies the relational expression 1.5<tan(HFOV)*TTL / Imgh<1.8, the field of view angle of the optical lens can be controlled within a reasonable range, which further enables the miniaturization of the optical lens, and at the same time is conducive to realizing high pixels of the optical lens and improving the imaging quality of the optical lens.

[0035] When the optical lens satisfies -3.5<f6 / f7<-1, the refractive power relationship between the sixth lens and the seventh lens of the optical lens can be effectively balanced, so that the total length of the optical lens is effectively shortened, and the mutual balance between positive and negative spherical aberrations of the optical lens can be achieved, which is beneficial to the improvement of the imaging quality of the optical lens.

[0036] As an optional implementation, in the embodiments of the first aspect of the present application, the optical lens satisfies the following relational expression:

[0037] -3.0<f8 / R15<-0.5; and / or, 0.1<(f4+f5) / R10<1.0

[0038] Wherein, f8 is the focal length of the eighth lens, R15 is the curvature radius of the object-side surface of the eighth lens at the optical axis; f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and R10 is the curvature radius of the image-side surface of the fifth lens at the optical axis.

[0039] When the optical lens satisfies the relational expression -3.0<f8 / R15<-0.5, the ratio of the focal length of the eighth lens to the curvature radius of the object-side surface of the eighth lens at the optical axis can be controlled within a reasonable range, which not only effectively prevents large-angle light from total reflection inside the eighth lens, reduces the influence of ghost images and stray light on the imaging quality, but also enables the optical lens to have good processability while maintaining miniaturization, facilitating later processing and mass production.

[0040] When the optical lens satisfies the relational expression 0.1<(f4+f5) / R10<1.0, the relationship between the focal length of the fourth lens and the focal length of the fifth lens can be reasonably configured, which is beneficial to correcting the off-axis aberration of the optical lens, improving the field curvature aberration of the optical lens, and at the same time facilitating the realization of the large image plane and ultra-thin performance of the optical lens. In addition, by reasonably controlling the curvature radius of the image-side surface of the fifth lens at the optical axis, the exit angle of light can be reduced, which is beneficial to lowering the tolerance sensitivity of the fifth lens.

[0041] As an optional implementation, in the embodiments of the first aspect of the present application, the optical lens satisfies the following relational expression:

[0042] 1.1<CT2 / T23<2.0; and / or, 0.2<CT3 / CT4<0.8;

[0043] Wherein, CT2 is the thickness of the second lens on the optical axis, T23 is the distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

[0044] When the optical lens satisfies the relational expression 1.1<CT2 / T23<2.0, it helps to reduce the overall size of the optical lens, and can also better improve the distortion of the optical lens, so as to achieve high-quality imaging.

[0045] When the optical lens satisfies the relational expression 0.2<CT3 / CT4<0.8, it is beneficial to reduce the sensitivity of the optical lens, improve the imaging resolution capability of the optical lens, and simultaneously meet the miniaturization design requirements of the optical lens.

[0046] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0047] 0.15<(CT6+CT7) / TT<0.25, and / or, 0.5<CT6 / CT7<1.0;

[0048] Wherein, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis; TT is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens.

[0049] By defining that the optical lens satisfies the relational expression 0.15<(CT6+CT7) / TT<0.25, the thickness of the sixth lens on the optical axis and the thickness of the seventh lens on the optical axis are effectively controlled, which is beneficial to reducing the total length of the optical lens and realizing its miniaturization design. At the same time, it can also avoid the situation that the thicknesses of the sixth lens and the seventh lens on the optical axis are too small, which is unfavorable to the processing and molding of the sixth lens and the seventh lens, and further can avoid the situation that the sensitivity of the optical lens is increased, resulting in the influence on the imaging quality of the optical lens.

[0050] When the optical lens satisfies the relational expression 0.5<CT6 / CT7<1.0, the risk of total reflection of stray light on the sixth lens can also be effectively reduced, and the generation of large-angle ghost images can be avoided, thereby helping to improve the imaging quality of the optical lens.

[0051] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0052] 0.2<10*|SAG41| / CT4<0.9; and / or, 1.5<SD11 / SD21<2.0;

[0053] wherein SAG41 is the distance on the optical axis from the intersection point of the object side of the fourth lens on the optical axis to the maximum effective radius of the object side of the fourth lens (i.e., the sag of the object side of the fourth lens), CT4 is the thickness of the fourth lens on the optical axis, SD11 is the maximum effective half-aperture of the object side of the first lens, and SD21 is the maximum effective half-aperture of the object side of the second lens.

[0054] By defining the optical lens to satisfy the relational expression 0.2<10*|SAG41| / CT4<0.9, it is helpful to smooth the trend of light passing through the fourth lens, so that the optical lens can obtain a larger field of view, and at the same time, it is also beneficial to control the surface profile of the fourth lens, making it easy to manufacture and mold, and reducing the defects of poor molding. Meanwhile, the limitation on the thickness of the fourth lens on the optical axis is helpful for the convergence of axial field of view light of the optical lens, so that the optical lens can obtain good imaging quality in the axial field of view.

[0055] By defining the optical lens to satisfy the relational expression 1.5<SD11 / SD21<2.0, it can effectively prevent the excessive difference between the maximum effective half-apertures of the object side of the first lens and the object side of the second lens, thereby facilitating the processing and molding of the first lens and the second lens, and improving the assembly stability of each lens of the optical lens. In addition, satisfying this relational expression can also reduce the incident angle of the light exiting from the edge of the first lens into the object side of the second lens, which is further beneficial to reducing the tilt tolerance sensitivity of the second lens.

[0056] In a second aspect, the present application discloses an imaging module, which includes an image sensor and the optical lens according to the above first aspect, and the image sensor is disposed on the image side of the optical lens.

[0057] The imaging module with the above optical lens can have good imaging quality on the basis of meeting the design requirement of miniaturization.

[0058] In a third aspect, the present application discloses a terminal device, which includes a device body and the imaging module according to the above second aspect, and the imaging module is disposed on the device body.

[0059] The terminal device with the above imaging module can have good imaging quality on the basis of meeting the design requirement of miniaturization.

[0060] Compared with the prior art, the beneficial effects of the present application lie in:

[0061] In the optical lens provided by the present application, in order to achieve good imaging quality while meeting the requirements of miniaturization design, by reasonably configuring the refractive power and surface shape of the eight lenses, that is, designing the object side and the image side of the first lens as a concave surface and a convex surface respectively at the paraxial region, more light can enter the first lens; the second lens has positive refractive power, which, together with the design that its object side is a convex surface at the paraxial region and its image side is a concave surface at the paraxial region, is beneficial to reducing the aperture of the optical lens while enabling a better convergence effect of light; the third lens has refractive power, which enables reasonable distribution of the focal power of the optical lens and prevents the focal power from being excessively concentrated on one or two of the lenses. The fourth lens has positive refractive power, which, together with the design that its image side is a convex surface at the paraxial region, can reduce the exit angle of marginal light; the fifth lens has negative refractive power, and at the same time, its object side and image side are respectively a concave surface and a convex surface at the paraxial region, which can help improve the spherical aberration of the optical lens and endow the optical lens with good aberration correction capability. The sixth lens has negative refractive power, and with its object side and image side respectively being a concave surface and a convex surface at the paraxial region, it can also help improve the spherical aberration of the optical lens and further enhance the aberration correction capability of the optical lens. The seventh lens has positive refractive power, which, together with the design that both its object side and image side are convex surfaces at the paraxial region, can provide positive refractive power for the optical lens, which is beneficial to balancing the refractive power of the optical lens, improving the light convergence capability of the optical lens, and correcting the coma of the optical lens, so that the optical lens has good imaging quality. The eighth lens provides negative refractive power, which, together with the design that its object side and image side are respectively a convex surface and a concave surface at the paraxial region, can make more light converge to the imaging surface, thereby improving the imaging resolution capability of the optical lens and further helping to improve the imaging quality of the optical lens.

[0062] Further, among the eight lenses, multiple lenses adopt the form of a convex-concave lens, a concave-convex lens or a biconvex lens, which is beneficial to controlling the thickness of the corresponding lens, thereby reducing the total length of the optical lens and enabling the optical lens to meet the miniaturization design requirements.

[0063] In addition, when the optical lens satisfies the relational expression: 45deg<HFOV<52deg, the field of view of the optical lens can be controlled within a reasonable range, so that the optical lens has a wide-angle function. Brief Description of the Drawings

[0064] In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0065] Figure 1 This is a schematic diagram of the structure of the optical lens disclosed in the first embodiment of this application;

[0066] Figure 2 The diagrams show the longitudinal spherical aberration (mm), astigmatism curve (mm), and distortion curve (%) of the optical lens disclosed in the first embodiment of this application.

[0067] Figure 3 This is a schematic diagram of the structure of the optical lens disclosed in the second embodiment of this application;

[0068] Figure 4 The diagrams show the longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical lens disclosed in the second embodiment of this application.

[0069] Figure 5 This is a schematic diagram of the structure of the optical lens disclosed in the third embodiment of this application;

[0070] Figure 6 The diagrams show the longitudinal spherical aberration (mm), astigmatism curve (mm), and distortion curve (%) of the optical lens disclosed in the third embodiment of this application.

[0071] Figure 7 This is a schematic diagram of the structure of the optical lens disclosed in the fourth embodiment of this application;

[0072] Figure 8 The diagrams show the longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical lens disclosed in the fourth embodiment of this application.

[0073] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of this application;

[0074] Figure 10 The diagrams shown in the fifth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens.

[0075] Figure 11 This is a schematic diagram of the structure of the optical lens disclosed in the sixth embodiment of this application;

[0076] Figure 12 The diagrams show the longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical lens disclosed in the sixth embodiment of this application.

[0077] Figure 13 This is a schematic diagram of the camera module disclosed in this application;

[0078] Figure 14 This is a structural diagram of the terminal device disclosed in this application when it is a mobile phone. Detailed Implementation

[0079] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0080] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0081] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0082] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0083] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0084] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0085] Please see Figure 1According to a first aspect of this application, an optical lens 100 is disclosed, comprising 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 sequentially along the optical axis O from the object side to the image side. The first lens L1 has negative or positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive or negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. During imaging, light rays enter sequentially from the object side of the first lens L1 through the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8, and are ultimately imaged onto the imaging plane 101 of the optical lens 100.

[0086] Furthermore, the object-side surface 11 of the first lens L1 is concave near the optical axis O, and the image-side surface 12 of the first lens L1 is convex near the optical axis O; the object-side surface 21 of the second lens L2 is convex near the optical axis O, and the image-side surface 22 of the second lens L2 is concave near the optical axis O; the object-side surface 31 of the third lens L3 is either convex or concave near the optical axis O, and the image-side surface 32 of the third lens L3 is either convex or concave near the optical axis O; the object-side surface 41 of the fourth lens L4 is either concave or convex near the optical axis O, and the image-side surface 42 of the fourth lens L4 is concave or concave near the optical axis O. The object-side surface 51 of the fifth lens L5 is concave near the optical axis O, and the image-side surface 52 of the fifth lens L5 is convex near the optical axis O; the object-side surface 61 of the sixth lens L6 is concave near the optical axis O, and the image-side surface 62 of the sixth lens L6 is convex near the optical axis O; the object-side surface 71 of the seventh lens is convex near the optical axis O, and the image-side surface 72 of the seventh lens is convex near the optical axis O; the object-side surface 81 of the eighth lens L8 is convex near the optical axis O, and the image-side surface 82 of the eighth lens L8 is concave near the optical axis O.

[0087] In some embodiments, the optical lens 100 can be applied to terminal devices such as smartphones, smart tablets, and monitoring equipment, and the first lens L1 to the eighth lens L8 can be made of plastic lenses to achieve the thinness and lightness of the optical lens 100 while making it easier to process complex lens surfaces.

[0088] In some embodiments, the optical lens 100 further includes an aperture stop 102, which can be an aperture stop and / or a field stop. It can be positioned between the image-side surface 32 of the second lens L2 and the object-side surface 31 of the third lens L3 of the optical lens 100; that is, this application employs a front aperture stop design. It is understood that in other embodiments, the aperture stop 102 can also be positioned between other lenses, and its placement can be adjusted according to actual conditions. This embodiment does not impose specific limitations on this.

[0089] In some embodiments, the optical lens 100 further includes a filter 90, which is disposed between the eighth lens L8 and the imaging surface 101 of the optical lens 100. In this embodiment, the filter 90 is an infrared cut-off filter, which can filter out light of other wavelengths such as infrared light, allowing only visible light to pass through, making the image more consistent with the visual experience of the human eye. Of course, the filter 90 can also be an infrared bandpass filter, which can filter out light of other wavelengths such as visible light, allowing only infrared light to pass through. By filtering out light of other wavelengths such as visible light, the image quality is improved; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image and obtain better image effects in dim environments and other special application scenarios. It is understood that the filter 90 can be made of optical glass coating, colored glass, or other materials, and can be selected according to actual needs. This embodiment does not make specific limitations.

[0090] In some embodiments, the optical lens 100 satisfies the following relationship: -3.0 <f12 / f56<-1.0;

[0091] Wherein, f12 is the combined focal length of the first lens L1 and the second lens L2, and f56 is the combined focal length of the fifth lens L5 and the sixth lens L6. Since the front lens group composed of the first lens L1 and the second lens L2 has positive refractive power, it can enhance the light focusing capability of the optical lens 100, which is beneficial to shortening the total length of the optical lens 100 and further meeting the miniaturization design requirements. Meanwhile, the rear lens group composed of the fifth lens L5 and the sixth lens L6 has negative refractive power, which can further expand the field of view of the optical lens 100, and simultaneously balance and cancel the spherical aberration introduced by the front lens group, so that the optical lens 100 can achieve good imaging quality. When f12 / f56≥-1.0, the negative refractive power of the rear lens group composed of the fifth lens L5 and the sixth lens L6 is too weak, resulting in insufficient aberration correction capability of the rear lens group, generating high-order aberrations and affecting the imaging quality of the optical lens 100. When f12 / f56≤-3.0, the positive refractive power of the front lens group composed of the first lens L1 and the second lens L2 is insufficient, which makes it difficult for the optical lens 100 to collect light, and meanwhile makes it hard to reduce the total length of the optical lens 100, which is not conducive to the miniaturization design of the optical lens 100.

[0092] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.2<f2 / f<3.0; wherein f2 is the focal length of the second lens L2, and f is the focal length of the optical lens 100. By limiting the ratio of the focal length of the second lens L2 to the focal length of the optical lens 100, that is, limiting the ratio of f2 / f, the positive refractive power of the second lens L2 can be reasonably configured to have appropriate positive refractive power, which is beneficial to enhancing the light converging capability of the optical lens 100, reducing the aberration of the optical lens 100, and further improving the imaging quality.

[0093] In some embodiments, the optical lens 100 satisfies the following relational expression: 5<|f1| / f<40;

[0094] Wherein, f1 is the focal length of the first lens L1, and f is the focal length of the optical lens 100. By limiting the ratio of |f1| / f, the refractive power of the first lens L1 can be reasonably distributed, which is beneficial to the wide-angle and miniaturization characteristics of the optical lens 100. That is, when the first lens L1 provides negative refractive power, it is beneficial to expand the field of view of the optical lens 100, and when the first lens L1 provides positive refractive power, it is beneficial to shorten the total length of the optical lens 100 to realize its miniaturization characteristic.

[0095] In some embodiments, the optical lens 100 satisfies the following relational expression: 9 < |f3| / f < 72; where f3 is the focal length of the third lens L3, and f is the focal length of the optical lens 100. By limiting the ratio of |f3| / f, the trend of light rays after entering the optical lens 100 can be effectively smoothed, which is beneficial to the convergence of marginal light rays with a large viewing angle. When the third lens L3 provides positive refractive power, it can make up for the insufficiency of the positive refractive power of the fourth lens L4, reduce the sensitivity of the optical lens 100, and improve the imaging quality. When the third lens L3 provides negative refractive power, it can further expand the field of view of the optical lens 100, so that the wide-angle function is realized.

[0096] In some embodiments, the optical lens 100 satisfies the following relational expression: -5.0 < (R11+R12) / (R11-R12) < -1.0; where R11 is the radius of curvature of the object-side surface 61 of the sixth lens L6 at the optical axis, and R12 is the radius of curvature of the image-side surface 62 of the sixth lens L6 at the optical axis. In this way, the surface shape of the sixth lens L6 can be effectively controlled, so that on the one hand, it is not only beneficial to moderate the deflection degree of light rays passing through the sixth lens L6 and reduce aberrations; on the other hand, it is also beneficial to the processing and forming of the sixth lens L6, making it easy to process.

[0097] In some embodiments, the optical lens 100 satisfies the following relational expression: -15 < R14 / R13 < 0; where R13 is the radius of curvature of the object-side surface 71 of the seventh lens L7 at the optical axis, and R14 is the radius of curvature of the image-side surface 72 of the seventh lens L7 at the optical axis. In this way, the radii of curvature of the object-side surface 71 and the image-side surface of the seventh lens L7 near the optical axis can be controlled within a reasonable range, thereby effectively preventing the seventh lens L7 from being excessively bent at the optical axis, improving the machinability of the seventh lens L7, and at the same time helping to reduce the imaging sensitivity of the optical lens 100. In addition, satisfying this relational expression can also effectively reduce the angle at which light rays enter the image sensor after passing through the seventh lens L7 and the eighth lens L8, thereby reducing the coma of the optical lens 100 and helping to improve the imaging quality of the optical lens 100.

[0098] In some embodiments, the optical lens 100 satisfies the following relational expressions: 1.5 < tan(HFOV)*TTL / Imgh < 1.8, and 45deg < HFOV < 52deg; where HFOV is half of the maximum field of view angle of the optical lens 100, TTL is the distance on the optical axis from the object side 11 of the first lens L1 to the imaging surface of the optical lens 100, and Imgh is half of the image height corresponding to the maximum field of view angle of the optical lens 100. In this way, the field of view angle of the optical lens 100 can be controlled within a reasonable range, enabling the optical lens 100 to further achieve miniaturization, while also facilitating high pixels of the optical lens 100 and improving the imaging quality of the optical lens 100. When tan(HFOV)*TTL / ImgH < 1.5, the field of view angle of the optical lens 100 is too small to meet the special needs of users, or the maximum imaging height is too large, making it difficult to correct the off-axis field aberration of the optical lens 100 and affecting the imaging quality. When tan(HFOV)*TTL / ImgH > 1.8, the field of view angle of the optical lens 100 is too large, which makes the distortion aberration of the optical lens 100 difficult to correct, resulting in severe imaging deformation and relatively low relative brightness at the edge field of view, thus affecting the imaging quality of the optical lens 100.

[0099] In some embodiments, the optical lens 100 satisfies the following relational expression: -3.5 < f6 / f7 < -1; where f6 is the focal length of the sixth lens L6, and f7 is the focal length of the seventh lens L7. In this way, the refractive power relationship between the sixth lens L6 and the seventh lens L7 of the optical lens 100 can be effectively balanced, so that the total length of the optical lens 100 is effectively shortened, and at the same time, the positive and negative spherical aberrations of the optical lens 100 can be balanced with each other, which is beneficial to the improvement of the imaging quality of the optical lens 100.

[0100] In some embodiments, the optical lens 100 satisfies the following relational expression: -3.0 < f8 / R15 < -0.5; where f8 is the focal length of the eighth lens L8, and R15 is the radius of curvature at the optical axis of the object side of the eighth lens L8.

[0101] By the limitation of this relational expression, the ratio of the focal length of the eighth lens L8 to the radius of curvature at the optical axis of the object side of the eighth lens L8 can be controlled within a reasonable range, which not only effectively avoids total reflection of large-angle light inside the eighth lens L8 and reduces the influence of ghost images and stray light on the imaging quality, but also enables the optical lens 100 to have good processability while maintaining miniaturization, facilitating later processing and mass production.

[0102] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.1<(f4+f5) / R10<1.0, where f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, and R10 is the radius of curvature of the image-side surface of the fifth lens L5 at the optical axis.

[0103] By defining through this relational expression, the relationship between the focal length of the fourth lens L4 and the focal length of the fifth lens L5 can be reasonably configured, which is beneficial to correcting off-axis aberrations of the optical lens 100, improving the field curvature aberration of the optical lens 100, and is also conducive to achieving the performance of large image plane and ultra-thinness of the optical lens 100. In addition, by reasonably controlling the radius of curvature of the image-side surface of the fifth lens L5 at the optical axis, the exit angle of light rays can be reduced, which is beneficial to lowering the tolerance sensitivity of the fifth lens L5.

[0104] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.1<CT2 / T23<2.0, where CT2 is the thickness of the second lens L2 on the optical axis, and T23 is the distance on the optical axis from the image-side surface 22 of the second lens L2 to the object-side surface 31 of the third lens L3.

[0105] When the optical lens 100 satisfies the relational expression 1.1<CT2 / T23<2.0, it can help reduce the overall size of the optical lens 100, and at the same time can better improve the distortion of the optical lens 100, so as to achieve high-quality imaging.

[0106] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.2<CT3 / CT4<0.8, where CT3 is the thickness of the third lens L3 on the optical axis, and CT4 is the thickness of the fourth lens L4 on the optical axis. This is beneficial to reducing the sensitivity of the optical lens 100, improving the imaging resolution capability of the optical lens 100, and simultaneously meeting the miniaturization design requirements of the optical lens 100.

[0107] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.15<(CT6+CT7) / TT<0.25, where CT6 is the thickness of the sixth lens L6 on the optical axis, CT7 is the thickness of the seventh lens L7 on the optical axis; TT is the distance on the optical axis from the object-side surface 11 of the first lens L1 to the image-side surface of the eighth lens L8. By limiting the optical lens 100 to satisfy the relational expression 0.15<(CT6+CT7) / TT<0.25, the thicknesses of the sixth lens L6 and the seventh lens L7 on the optical axis are effectively controlled, which is beneficial to reducing the total length of the optical lens 100 and realizing its miniaturized design. At the same time, it can also avoid the situation that the thicknesses of the sixth lens L6 and the seventh lens L7 on the optical axis are too small to be unfavorable for the processing and molding of the sixth lens L6 and the seventh lens L7, thereby avoiding the increase of the sensitivity of the optical lens 100 and the situation that affects the imaging quality of the optical lens 100.

[0108] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.5<CT6 / CT7<1.0. When the optical lens 100 satisfies the relational expression 0.5<CT6 / CT7<1.0, the risk of total reflection of stray light on the sixth lens L6 can also be effectively reduced, and the generation of large-angle ghost images can be avoided, thereby helping to improve the imaging quality of the optical lens 100.

[0109] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.2<10*|SAG41| / CT4<0.9, where SAG41 is the distance on the optical axis from the intersection point of the object-side surface 41 of the fourth lens L4 on the optical axis to the maximum effective radius position of the object-side surface 41 of the fourth lens L4 (i.e., the sagittal height of the object-side surface 41 of the fourth lens L4), and CT4 is the thickness of the fourth lens L4 on the optical axis. In this way, it helps to smooth the trend of light passing through the fourth lens L4, so that the optical lens 100 obtains a larger field of view, and at the same time, it is also beneficial to control the surface shape of the fourth lens L4, making it easy to manufacture and mold, and reducing defects of poor molding. Meanwhile, the limitation on the thickness of the fourth lens L4 on the optical axis helps the convergence of the on-axis field of view light of the optical lens 100, so that the optical lens 100 can obtain good imaging quality of the on-axis field of view.

[0110] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.5<SD11 / SD21<2.0, where SD11 is the maximum effective half-aperture of the object-side surface 11 of the first lens L1, and SD21 is the maximum effective half-aperture of the object-side surface 21 of the second lens L2. When this relational expression is satisfied, the situation that the difference between the maximum effective half-apertures of the object-side surface 11 of the first lens L1 and the object-side surface 21 of the second lens L2 is too large can be effectively prevented, which is beneficial to the processing and forming of the first lens L1 and the second lens L2, and improves the assembly stability of each lens of the optical lens 100. In addition, satisfying this relational expression can also reduce the incident angle of the marginal exit light of the first lens L1 entering the object-side surface 21 of the second lens L2, which is further beneficial to reducing the tilt tolerance sensitivity of the second lens L2.

[0111] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0112] First Embodiment

[0113] The schematic structural diagram of the optical lens 100 disclosed in the first embodiment of the present application is as shown in Figure 1 , the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 which are sequentially arranged from the object side to the image side along the optical axis O.

[0114] In this embodiment, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

[0115] Further, the object-side surface 11 and the image-side surface 12 of the first lens L1 are a concave surface and a convex surface respectively near the optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are a convex surface and a concave surface respectively near the optical axis O; the object-side surface 31 and the image-side surface 32 of the third lens L3 are a convex surface and a concave surface respectively near the optical axis O; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are both convex surfaces near the optical axis O; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are a concave surface and a convex surface respectively near the optical axis O; the object-side surface 61 and the image-side surface 62 of the sixth lens L6 are a concave surface and a convex surface respectively at the optical axis O; the object-side surface 71 and the image-side surface 72 of the seventh lens L7 are both convex surfaces at the optical axis O; the object-side surface 81 and the image-side surface 82 of the eighth lens L8 are a convex surface and a concave surface respectively at the optical axis O.

[0116] For example, all eight lenses from the first lens L1 to the eighth lens L8 can be plastic aspherical lenses, which facilitates the processing and molding of each lens of the optical lens 100, and also enables the lightweight design of the optical lens.

[0117] Specifically, taking an optical lens 100 with a focal length f = 4.43 mm, an aperture number FNO = 1.87, a maximum field of view (HFOV) of half the maximum field of view (TTL) of 51.0 degrees, and a total length TTL of 7.105 mm as an example, other parameters of the optical lens 100 are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are arranged sequentially according to the order of the elements in Table 1 from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side and image side of the first lens L1, respectively. The Y-radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side of the lens to the next surface on the optical axis O. The value of aperture 102 in the "Thickness" parameter column represents the distance from aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis O. When this value is negative, it indicates that aperture 102 is set on the image side of the vertex of the next surface. If the thickness of aperture 102 is positive, aperture 102 is on the object side of the vertex of the next surface. It can be understood that the units of 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 at a reference wavelength of 587.5618 nm.

[0118] In addition, in Tables 1 and 2 below, surface numbers 1 and 2 correspond to the object side 11 and image side 12 of the first lens L1, respectively; surface numbers 3 and 4 correspond to the object side 21 and image side 22 of the second lens L2, respectively; and so on. Surface numbers 15 and 16 correspond to the object side 81 and image side 82 of the eighth lens L8, respectively.

[0119] In the first embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0120]

[0121] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis O; c is the curvature of the aspherical surface at the optical axis O, c = 1 / Y (i.e., the paraxial curvature c is the reciprocal of the radius of curvature Y in Table 1 below); K is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients of the aspherical surface: A4, A6, A8, A10, A12, A14, A16, A18, A20.

[0122] Table 1

[0123]

[0124]

[0125] Table 2

[0126]

[0127]

[0128] Please see Figure 2 (A) in the middle Figure 2 (A) shows the longitudinal spherical aberration curves of the optical lens 100 in the first embodiment at wavelengths of 656.2725 nm, 587.5618 nm, and 486.1327 nm. Figure 2 In (A), the horizontal coordinate along the X-axis represents the focal point offset in mm, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in the first embodiment, the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0129] Please see Figure 2 (B) in the middle Figure 2 (B) in the figure shows the astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. The horizontal axis along the X-axis represents the focus shift in mm, and the vertical axis along the Y-axis represents the image height in mm. In the astigmatism curve diagram, T represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 As can be seen from (B) in the figure, the astigmatism of the optical lens 100 is well compensated at this wavelength.

[0130] Please see Figure 2 (C) in the middle, Figure 2 (C) in the figure is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 2 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618nm.

[0131] Second Embodiment

[0132] The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of this application is shown below. Figure 3 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0133] In this embodiment, regarding the refractive power of the first lens L1 to the eighth lens L8, only the refractive power of the third lens is positive, while the refractive power of the other lenses is the same as in the first embodiment, which can be referred to in the first embodiment and will not be repeated here.

[0134] Furthermore, regarding the design of the surface shapes of the first lens L1 to the eighth lens L8, only the object side of the fourth lens L4 is concave near the optical axis. The surface shape designs of the other lenses are consistent with those in the first embodiment, as described in the first embodiment, and will not be repeated here.

[0135] Specifically, the parameters of the optical lens 100 are given in Table 3 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 3 are all mm, and the refractive index, Abbe number, etc., in Table 3 are obtained at a reference wavelength of 587.5618 nm. Furthermore, regarding the correspondence between the surface numbers and the object-side and image-side surfaces of each lens, please refer to the description in the foregoing first embodiment; it will not be repeated here.

[0136] In the second embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses. The calculation method for the surface shape x of each aspherical lens can be derived from the description of the foregoing embodiments, and will not be repeated here. Table 4 below gives the higher-order coefficients of the aspherical lenses: A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0137] Table 3

[0138]

[0139]

[0140] Table 4

[0141]

[0142]

[0143] Please see Figure 4 (A) in the middle, by Figure 4 As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0144] Third Embodiment

[0145] The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of this application is shown below. Figure 5 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0146] In this embodiment, the refractive power of the first lens L1 to the eighth lens L8 is the same as in the first embodiment, and will not be repeated here. Furthermore, in the surface design of the object-side and image-side surfaces of the first lens L1 to the eighth lens L8 near the optical axis, except that the object-side surface of the fourth lens L4 is concave near the optical axis, the surface design of the object-side and image-side surfaces of the other lenses near the optical axis is the same as in the first embodiment. For details, please refer to the first embodiment, and will not be repeated here.

[0147] Specifically, the parameters of the optical lens 100 are given in Table 5 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 5 are all mm, and the refractive index, Abbe number, etc., in Table 5 are obtained at a reference wavelength of 587.5618 nm. Furthermore, regarding the correspondence between the surface numbers and the object-side and image-side surfaces of each lens, please refer to the description in the foregoing first embodiment; it will not be repeated here.

[0148] In the third embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses. The calculation method for the surface shape x of each aspherical lens can be derived from the description of the foregoing embodiments, and will not be repeated here. Table 6 below gives the higher-order coefficients of the aspherical lenses: A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0149] Table 5

[0150]

[0151] Table 6

[0152]

[0153]

[0154] Please see Figure 6 ,Depend on Figure 6 As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0155] Fourth embodiment

[0156] The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of this application is shown below. Figure 7 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0157] In this embodiment, the refractive power of the first lens L1 to the eighth lens L8 is the same as that of the first lens, except that the first lens has positive refractive power. For details, please refer to the first embodiment, which will not be repeated here.

[0158] Furthermore, the surface design of the object side and image side of the first lens L1 to the eighth lens L8 near the optical axis is consistent with that of the first embodiment, and will not be repeated here.

[0159] Specifically, the parameters of the optical lens 100 are given in Table 7 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 7 are all mm, and the refractive index, Abbe number, etc., in Table 7 are all obtained at a reference wavelength of 587.5618 nm. Furthermore, regarding the correspondence between the surface numbers and the object-side and image-side surfaces of each lens, please refer to the description in the foregoing first embodiment, which will not be repeated here.

[0160] In the fourth embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses. The calculation method for the surface shape x of each aspherical lens can be derived from the description of the foregoing embodiments, and will not be repeated here. Table 8 below gives the higher-order coefficients of the aspherical lenses: A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0161] Table 7

[0162]

[0163] Table 8

[0164]

[0165] Please see Figure 8 ,Depend on Figure 8 As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0166] Fifth Embodiment

[0167] The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of this application is shown below. Figure 9 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0168] In this embodiment, the refractive power of the first lens L1 to the eighth lens L8 is the same as that of the first lens, except that the first lens has positive refractive power. For details, please refer to the first embodiment, which will not be repeated here.

[0169] Furthermore, in the surface design of the object side and image side of the first lens L1 to the eighth lens L8 near the optical axis, except that the object side 31 of the third lens L3 is concave near the optical axis and the image side of the third lens L3 is convex near the optical axis, the surface design of the object side and image side of the other lenses near the optical axis is the same as that in the first embodiment, and will not be described again here.

[0170] Specifically, the parameters of the optical lens 100 are given in Table 9 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 9 are all mm, and the refractive index, Abbe number, etc., in Table 9 are all obtained at a reference wavelength of 587.5618 nm. Furthermore, regarding the correspondence between the surface numbers and the object-side and image-side surfaces of each lens, please refer to the description in the foregoing first embodiment, which will not be repeated here.

[0171] In the fifth embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses. The calculation method for the surface shape x of each aspherical lens can be derived from the description of the foregoing embodiments, and will not be repeated here. Table 10 below gives the higher-order coefficients of the aspherical lenses: A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0172] Table 9

[0173]

[0174]

[0175] Table 10

[0176]

[0177]

[0178] Please see Figure 10 ,Depend on Figure 10 As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 10 (A) Figure 10 (B) and Figure 10 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0179] Sixth Embodiment

[0180] The structural schematic diagram of the optical lens 100 disclosed in the sixth embodiment of this application is shown below. Figure 11 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0181] In this embodiment, except for the first lens L1 which has positive refractive power, the refractive power of the other lenses is the same as in the first embodiment, and will not be described again here.

[0182] Furthermore, the surface design of the object side and image side of the first lens L1 to the eighth lens L8 near the optical axis can be found in the first embodiment, and will not be repeated here.

[0183] Specifically, the parameters of the optical lens 100 are given in Table 11 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 11 are all mm, and the refractive index, Abbe number, etc., in Table 11 are obtained at a reference wavelength of 587.5618 nm. Furthermore, regarding the correspondence between the surface numbers and the object-side and image-side surfaces of each lens, please refer to the description in the foregoing first embodiment; it will not be repeated here.

[0184] In the sixth embodiment, the first lens L1 to the eighth lens L8 are all aspherical lenses. The calculation method for the surface shape x of each aspherical lens can be derived from the description of the foregoing embodiments, and will not be repeated here. Table 12 below gives the higher-order coefficients of the aspherical lenses: A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0185] Table 11

[0186]

[0187]

[0188] Table 12

[0189]

[0190]

[0191] Please see Figure 12,Depend on Figure 12 As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 12 (A) Figure 12 (B) and Figure 12 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0192] Refer to Table 13, which summarizes the ratios of the relationships in the first to sixth embodiments of this application.

[0193] Table 13

[0194]

[0195]

[0196] Please see Figure 13 This application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any of the first to sixth embodiments of the first aspect above. The image sensor 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the subject and project it onto the image sensor 201. The image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. It can be understood that the camera module 200 with the above-described optical lens 100 has all the technical effects of the above-described optical lens 100, that is, the camera module 200 can have good imaging quality while taking into account the design requirements of miniaturization. Since the above-described technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0197] This application also discloses a terminal device 300, which includes a device body 301 and the aforementioned camera module 200, with the camera module 200 disposed on the device body 301. The terminal device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, etc. Figure 14 As shown, taking the terminal device 300 as a mobile phone as an example, the device body 301 can be a shell, and the camera module 200 can be set in the shell or set outside the shell.

[0198] It is understood that the terminal device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical lens 100. That is, the terminal device 300 can achieve good image quality while meeting the design requirements of miniaturization. Since the aforementioned technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0199] The foregoing provides a detailed description of the optical lens, camera module, and terminal device disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the optical lens, camera module, and terminal device of this application and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical lens, characterized in that, There are a total of eight lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side; The first lens has refractive power, the object side of the first lens is concave near the optical axis, and the image side of the first lens is convex near the optical axis. The second lens has positive refractive power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis; The third lens has refractive power; The fourth lens has positive refractive power, and the image-side surface of the fourth lens is convex near the optical axis. The fifth lens has negative refractive power, the object side of the fifth lens is concave near the optical axis, and the image side of the fifth lens is convex near the optical axis. The sixth lens has negative refractive power, the object side of the sixth lens is concave near the optical axis, and the image side of the sixth lens is convex near the optical axis. The seventh lens has positive refractive power, and both the object-side and image-side surfaces of the seventh lens are convex near the optical axis. The eighth lens has negative refractive power, 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: 45deg < HFOV < 52deg; 1.5 < SD11 / SD21 < 2.0; Wherein, HFOV is half of the maximum field of view of the optical lens, SD11 is the maximum effective half-aperture of the object side of the first lens, and SD21 is the maximum effective half-aperture of the object side of the second lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 1.2 < f2 / f < 3.0; and / or, 10.595 ≤ |f1| / f < 40; and / or, 9 < |f3| / f < 72; and / or, -2.379 ≤ f12 / f56 ≤ -1.611; Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f is the focal length of the optical lens, f12 is the combined focal length of the first lens and the second lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: -3.01≤(R11+R12) / (R11-R12)<-1.0; and / or, -8.727≤R14 / R13≤-1.501; Wherein, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, R12 is the radius of curvature of the image side of the sixth lens at the optical axis, R13 is the radius of curvature of the object side of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side of the seventh lens at the optical axis.

4. The optical lens according to claim 1, characterized in that, The fourth lens and the fifth lens form a cemented lens, and the optical lens satisfies the following relationship: 1.5 < tan(HFOV)*TTL / Imgh < 1.8, and / or, -2.745 ≤ f6 / f7 ≤ -1.89; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, Imgh is half the image height corresponding to the maximum field of view of the optical lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: -3.0 < f8 / R15 < -0.5; and / or, 0.1 < (f4 + f5) / R10 < 1.0 Where f8 is the focal length of the eighth lens, R15 is the radius of curvature of the object side of the eighth lens at the optical axis; f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and R10 is the radius of curvature of the image side of the fifth lens at the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 1.1 < CT2 / T23 < 2.0; and / or, 0.2 < CT3 / CT4 < 0.8; Wherein, CT2 is the thickness of the second lens on the optical axis, T23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

7. The optical lens according to claim 1, characterized in that the optical lens satisfies the following relationship: 0.15 < (CT6 + CT7) / TT < 0.25, and / or, 0.5 < CT6 / CT7 < 1.0; in, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis; TT is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.2 < 10 * |SAG41| / CT4 < 0.9; and / or, 1.65 ≤ SD11 / SD21 ≤ 1.82; Wherein, SAG41 is the distance from the intersection of the object side surface of the fourth lens on the optical axis to the maximum effective radius of the object side surface of the fourth lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

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

10. An electronic device, characterized in that, The electronic device includes a housing and a camera module as described in claim 9, wherein the camera module is disposed in the housing.

Images