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 negative refractive power, and the object side and the image side are both concave. The second lens has positive refractive power, and the object side and the image side are a convex surface and a concave surface respectively. The third lens has positive refractive power, and the object side and the image side are both convex. The fourth lens has negative refractive power, and the object side and the image side are both concave. The fifth lens has positive refractive power, and the object side and the image side are both convex. The sixth lens has refractive power, and the object side and the image side are a convex surface and a concave surface respectively. The seventh lens has positive refractive power, and the object side and the image side are a concave surface and a convex surface respectively. The eighth lens has negative refractive power, and the object side and the image side are a concave surface and a convex surface respectively. The optical lens satisfies the relationship 1.8 < tan (FOV) * TTL / Imgh < 2.0. The optical lens, the camera module and the terminal device provided by the application can have high pixels and long focus function while meeting the design requirement of miniaturization.

Description

TECHNICAL FIELD

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

[0002] With the development of the vehicle-mounted industry, the technical requirements of automobile driving auxiliary cameras such as front view, side view, automatic cruise, ADAS (Advanced Driver Assistant System) driving recorder and reversing image are getting higher and higher.

[0003] Especially in the ADAS system, the pixels of the optical lens of the camera module commonly used at present are not high enough, and the aperture and the shooting distance are small, which cannot provide a clear field of view for the driver. If the pixels are to be increased, the number of lenses of the optical lens needs to be increased, which is not conducive to the miniaturized design of the optical lens, and it is relatively difficult to simultaneously ensure a large aperture and a long shooting distance. Therefore, how to research an optical lens that can have high pixels, a large aperture and a long focal length while taking into account the miniaturized design is a problem that needs to be solved in the industry. SUMMARY

[0004] The embodiments of the present application disclose an optical lens, a camera module and a terminal device, which can have high pixels, a large aperture and a long focal length while taking into account the miniaturized design requirements.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical lens, which has 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 in order along the optical axis from the object side to the image side.

[0006] The first lens has negative refractive power, and the object side surface and the image side surface of the first lens are concave at the near optical axis.

[0007] The second lens has positive refractive power, and the object side surface of the second lens is convex at the near optical axis.

[0008] The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are convex at the near optical axis.

[0009] The fourth lens has negative refractive power, and the object side surface and the image side surface of the fourth lens are concave at the near optical axis.

[0010] The fifth lens has positive refractive power, and the object side surface and the image side surface of the fifth lens are convex at the near optical axis.

[0011] The sixth lens has a refractive power, a convex object side surface at the near optical axis, and a concave image side surface at the near optical axis;

[0012] The seventh lens has a positive refractive power, a concave object side surface at the near optical axis, and a convex image side surface at the near optical axis;

[0013] The eighth lens has a negative refractive power, a concave object side surface at the near optical axis;

[0014] The optical lens satisfies the following relationship:

[0015] 1.8 < tan(FOV) * TTL / Imgh < 2.0;

[0016] wherein FOV is a maximum field of view angle of the optical lens, Imgh is an image height corresponding to the maximum field of view angle of the optical lens, and TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis.

[0017] The optical lens provided in the application can meet the requirements of miniaturization design while having high pixels, large aperture and long focus function. The power and surface shape of the eight lenses are reasonably configured. The first lens is provided with negative power, and the object side surface and the image side surface thereof are both concave near the optical axis, which is beneficial to the gentle entry of light into the optical lens. The second lens has positive power, and the object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis, which is beneficial to correcting the high-order aberration of the edge light of the optical lens and improving the imaging quality of the optical lens. The third lens has positive power, so that the third lens can provide positive power for the optical lens, shorten the total length of the optical lens, and the object side surface and the image side surface of the third lens are both convex near the optical axis, which is beneficial to suppressing the aberration of the optical lens and improving the image quality of the optical lens, so that high-definition imaging is realized. The fourth lens has negative power, and the fifth lens has positive power, which is beneficial to balancing the chromatic aberration of the optical lens and correcting the spherical aberration of the optical lens, so as to eliminate the aberration of the optical lens. The object side surface and the image side surface of the fourth lens are both concave near the optical axis, and the object side surface and the image side surface of the fifth lens are both convex near the optical axis, which can further converge light. The sixth lens has power, and the object side surface and the image side surface thereof are convex and concave near the optical axis, respectively, which can facilitate the optical lens to reasonably distribute the power and improve the imaging quality of the optical lens. The seventh lens has positive power, and the object side surface and the image side surface thereof are concave and convex near the optical axis, respectively, which can provide positive power for the optical lens, balance the power of the optical lens, improve the light convergence ability of the optical lens, and reduce the eccentric sensitivity of the optical lens, so as to reduce the assembly sensitivity of the optical lens and improve the assembly yield of the optical lens. The eighth lens provides negative power, and the object side surface and the image side surface thereof are concave and convex near the optical axis, respectively, which can optimize the distortion of the optical lens, reduce the incidence angle of the chief ray of the optical lens on the imaging surface, make the light enter the large-size imaging surface more gently, and avoid the case that the angle of the edge incident light is too large to cause stray light.

[0018] Further, in the eight lenses, multiple lenses adopt the mode of convex-concave lens, concave-convex lens or double-convex lens or double-concave lens, which is beneficial to controlling the thickness of the corresponding lens, thereby reducing the total length of the optical lens and meeting the miniaturization design requirements.

[0019] In addition, since the field of view range of the optical lens determines how much spatial information the optical lens acquires, by limiting the optical lens to satisfy the relationship 1.8 < tan(FOV) * TTL / Imgh < 2.0, that is, making the imaging surface of the optical lens and the field of view angle of the optical lens be in a proper proportion, sufficient field of view angle can be provided to meet the requirement of the large shooting angle of the terminal device when shooting far away, while reducing the angle of light entering the image sensor, and improving the light sensing performance of the optical lens. At the same time, by limiting the relationship between the image height and the total length of the optical lens, the design of each parameter of the optical lens is reasonable, and thus the imaging stability of the optical lens can be realized, and the design requirement of miniaturization can be met.

[0020] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0021] -8 < Rs17 / f8 < 1.9;

[0022] wherein Rs17 is the curvature radius of the image side surface of the eighth lens at the optical axis, and f8 is the focal length of the eighth lens.

[0023] Since the eighth lens has negative refractive power, by limiting the ratio of the curvature radius of the image side surface of the eighth lens at the optical axis to the focal length of the eighth lens, the aberration generated by the folding of light through the lens group before the eighth lens can be compensated, and the problem of under-correction of aberration can be reduced. At the same time, the image side surface of the eighth lens is closest to the imaging surface, and the surface shape thereof at the near optical axis is reasonably controlled, so that the deflection angle of the light before imaging can be effectively controlled. Therefore, satisfying the above relationship can also effectively shrink the width of the light bundle and reduce the angle of the chief ray incident to the imaging surface of the optical lens.

[0024] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0025] 14 < Rs1 / SAGs1 < 129;

[0026] wherein Rs1 is the curvature radius of the object side surface of the first lens at the optical axis, and SAGs1 is the distance in the optical axis direction from the intersection of the object side surface of the first lens and the optical axis to the maximum effective half aperture of the object side surface of the first lens (that is, the sag of the object side surface of the first lens, which is opposite to the direction of the optical axis).

[0027] The first lens provides negative refractive power for the optical lens, by limiting the ratio of the curvature radius of the object side surface of the first lens at the optical axis to the sag of the object side surface of the first lens, the lens surface type closest to the object side can be effectively controlled, which is beneficial to capturing more light into the optical lens, and realizing high-pixel imaging of the optical lens. When the ratio is lower than the lower limit, the absolute value of the sag of the object side surface of the first lens is too large, which causes the object side surface of the first lens to be too curved, and ghosting is prone to occur, which is not conducive to improving the imaging quality of the optical lens. If the ratio exceeds the upper limit, the absolute value of the curvature radius of the object side surface of the first lens is too large, which causes the object side surface of the first lens to be too flat, which is not conducive to controlling the surface type of the object side surface of the first lens, and further not conducive to the processing of the first lens.

[0028] As an optional implementation, in the embodiment of the first aspect of the present application,

[0029] The fourth lens and the fifth lens constitute a cemented lens, and the optical lens satisfies the following relationship:

[0030] 2 < |f45 / f| < 7.5;

[0031] Wherein, f45 is the combined focal length of the fourth lens and the fifth lens, and f is the focal length of the optical lens.

[0032] The fourth lens provides negative refractive power for the optical lens, and the fifth lens provides positive refractive power for the optical lens, by using the structure of two lenses with one positive and one negative refractive power being cemented, which is conducive to mutual correction of aberrations. When the upper limit of the relationship is exceeded, the absolute value of the combined focal length of the cemented lens is too large, the refractive power is too small, and large edge aberration and chromatic aberration are prone to occur, which is not conducive to improving the resolution performance of the optical lens; when the lower limit of the relationship is lower than the lower limit, the overall refractive power of the fourth lens and the fifth lens is too strong, which causes the lens group to easily produce serious astigmatism, which is not conducive to improving the imaging quality of the optical lens.

[0033] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0034] 4.5 < f3 / CT3 < 5.2;

[0035] Wherein, f3 is the focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis (i.e. the center thickness of the third lens).

[0036] By reasonably matching the relationship between the center thickness of the third lens and the focal length of the third lens, the tolerance sensitivity of the center thickness of the third lens can be reduced, thereby reducing the processing difficulty of the single lens, and the assembly yield of the optical lens is improved, and the production cost is further reduced. When exceeding the upper limit of the relationship, the optical lens is too sensitive to the center thickness of the third lens, and the processing of the single lens is difficult to meet the required tolerance requirement, thereby reducing the assembly yield of the optical lens; when being lower than the lower limit of the relationship, the center thickness of the third lens is too large on the premise of meeting the optical performance, and since the density of the glass lens is large, the weight of the lens is larger, which is not conducive to the miniaturization and lightweight design of the optical lens.

[0037] As an optional implementation, in the embodiment of the first aspect of the application, the optical lens satisfies the following relationship:

[0038] 22mm < TTL / FNO ≤ 25mm;

[0039] Wherein, FNO is the aperture number of the optical lens.

[0040] In this way, while meeting the miniaturization, the aperture of the optical lens is increased, so that the optical lens realizes the large aperture effect. When exceeding the upper limit of the relationship, the total length of the optical lens is too large, which is not conducive to the miniaturization design requirement of the optical lens, and when being lower than the lower limit of the relationship, the aperture number of the optical lens is increased, the aperture is reduced, which leads to insufficient light quantity of the optical lens, and the illumination of the optical lens is reduced, which not only affects the high-pixel imaging effect, but also is not conducive to the large-aperture imaging of the optical lens.

[0041] As an optional implementation, in the embodiment of the first aspect of the application, the optical lens satisfies the following relationship:

[0042] -56mm < f7*f8 / f < -34mm;

[0043] Wherein, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f is the focal length of the optical lens.

[0044] Since the seventh lens provides positive refractive power for the optical lens, and the eighth lens provides negative refractive power for the optical lens, by limiting the optical lens to satisfy the relationship, the aberrations generated by each other can be corrected, and the refractive power of the seventh lens and the eighth lens in the optical lens can be reasonably balanced, which is conducive to expanding the width of the light beam, so that the light beam with a larger angle expands in width after passing through the first lens to the sixth lens, thereby effectively utilizing the refractive power of the seventh lens and the eighth lens, making the wide light beam fully incident on the imaging surface of the optical lens, and the optical lens has a wider field of view, which is conducive to realizing high-pixel imaging.

[0045] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0046] -41<(Rs14+Rs15) / CT7<-13;

[0047] wherein Rs14 is the curvature radius of the object side surface of the seventh lens at the optical axis, Rs15 is the curvature radius of the image side surface of the seventh lens at the optical axis, and CT7 is the thickness of the seventh lens on the optical axis (i.e., the center thickness of the seventh lens).

[0048] By limiting the relationship, the variation of the surface of the seventh lens is controlled reasonably, and the risk of ghosting is reduced. When the upper limit of the relationship is exceeded, the center thickness of the seventh lens is too large, the eccentricity sensitivity of the optical lens is increased, and the assembly of the optical lens is not conducive. When the lower limit of the relationship is exceeded, the surface of the seventh lens is too curved, and the processing thereof is not conducive.

[0049] In a second aspect, the present application discloses a camera module, comprising an image sensor and the optical lens according to the first aspect, wherein the image sensor is arranged on the image side of the optical lens.

[0050] The camera module with the optical lens described above can have high pixels and wide-angle functions while meeting the design requirement of miniaturization.

[0051] In a third aspect, the present application discloses a terminal device, comprising a device body and the camera module according to the second aspect, wherein the camera module is arranged on the device body.

[0052] The terminal device with the camera module described above can have high pixels and wide-angle functions while meeting the design requirement of miniaturization.

[0053] Compared with the prior art, the present application has the following advantages:

[0054] The optical lens provided in the application can meet the requirements of miniaturization design while having high pixels, a large aperture and long focus functions. The refractive power and surface shape of the eight lenses are reasonably configured. The first lens is provided with negative refractive power, and the object side surface and the image side surface thereof are both concave near the optical axis, which is beneficial to the smooth entry of light into the optical lens. The second lens has positive refractive power, and the object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis, which is beneficial to correcting the high-order aberration of the edge light of the optical lens and improving the imaging quality of the optical lens. The third lens has positive refractive power, so that the third lens can provide positive refractive power for the optical lens, shorten the total length of the optical lens, and the object side surface and the image side surface of the third lens are both convex near the optical axis, which is beneficial to suppressing the aberration of the optical lens and improving the image quality of the optical lens, so that high-definition imaging is realized. The fourth lens has negative refractive power, and the fifth lens has positive refractive power, which is beneficial to balancing the chromatic aberration of the optical lens and correcting the spherical aberration of the optical lens, so as to eliminate the aberration of the optical lens. The object side surface and the image side surface of the fourth lens are both concave near the optical axis, and the object side surface and the image side surface of the fifth lens are both convex near the optical axis, which can further converge light. The sixth lens has refractive power, and the object side surface and the image side surface thereof are convex and concave near the optical axis, respectively, which can facilitate the optical lens to reasonably distribute the refractive power and improve the imaging quality of the optical lens. The seventh lens has positive refractive power, and the object side surface and the image side surface thereof are concave and convex near the optical axis, respectively, which can provide positive refractive power for the optical lens, balance the refractive power of the optical lens, improve the light convergence ability of the optical lens and reduce the eccentric sensitivity of the optical lens, so as to reduce the assembly sensitivity of the optical lens and improve the assembly yield of the optical lens. The eighth lens provides negative refractive power, and the object side surface and the image side surface thereof are concave and convex near the optical axis, respectively, which can optimize the distortion of the optical lens, reduce the incidence angle of the chief ray of the optical lens on the imaging surface, make the light enter the large-size imaging surface more smoothly, and avoid the case that the angle of the edge incident light is too large to cause stray light.

[0055] Further, in the eight lenses, multiple lenses adopt the mode of convex-concave lenses, concave-convex lenses or double-convex lenses or double-concave lenses, which is beneficial to controlling the thickness of the corresponding lenses, thereby reducing the total length of the optical lens and meeting the requirements of miniaturization design.

[0056] In addition, since the field of view range of the optical lens determines how much spatial information the optical lens acquires, by limiting the optical lens to satisfy the relationship 1.8 < tan(FOV) * TTL / Imgh < 2.0, that is, making the imaging surface of the optical lens and the field of view of the optical lens be in a proper proportion, sufficient field of view can be provided to meet the requirement of the large shooting angle of the terminal device when shooting far away, while reducing the angle of light entering the image sensor and improving the light sensing performance of the optical lens. At the same time, by limiting the relationship between the image height and the total length of the optical lens, the design of each parameter of the optical lens is reasonable, and thus the imaging stability of the optical lens can be realized, and the design requirement of miniaturization can be met. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0058] Figure 1 is a structural schematic diagram of the optical lens disclosed by the first embodiment of the present application;

[0059] Figure 2 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the first embodiment of the present application;

[0060] Figure 3 is a structural schematic diagram of the optical lens disclosed by the second embodiment of the present application;

[0061] Figure 4 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the second embodiment of the present application;

[0062] Figure 5 is a structural schematic diagram of the optical lens disclosed by the third embodiment of the present application;

[0063] Figure 6 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the third embodiment of the present application;

[0064] Figure 7 is a structural schematic diagram of the optical lens disclosed by the fourth embodiment of the present application;

[0065] Figure 8 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the fourth embodiment of the present application;

[0066] Figure 9 is a structural schematic diagram of an optical lens disclosed by a fifth embodiment of the present application;

[0067] Figure 10 is a longitudinal spherical aberration diagram (mm), a coma curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the fifth embodiment of the present application;

[0068] Figure 11 is a structural schematic diagram of a camera module disclosed by the present application;

[0069] Figure 12 is a structural schematic diagram of a terminal device as a mobile phone disclosed by the present application;

[0070] Figure 13 is a structural schematic diagram of a terminal device as a car disclosed by the present application. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0072] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0073] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0074] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those of ordinary skill in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific situation.

[0075] In addition, the terms "first", "second", and the like are mainly used to distinguish different devices, elements or components (the specific types and configurations can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "a plurality" is two or more.

[0076] The technical solutions of the present application will be further described below in conjunction with the embodiments and drawings.

[0077] Please refer to Figure 1 According to a first aspect of the present application, an optical lens 100 is disclosed, which comprises 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 O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a negative refractive power or a positive refractive power, the seventh lens L7 has a positive refractive power, and the eighth lens L8 has a negative refractive power. When imaging, the light rays enter 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 image on the imaging surface 101 of the optical lens 100.

[0078] Further, the object side surface 11 of the first lens L1 is concave at the near optical axis O, and the image side surface 12 of the first lens L1 is concave at the near optical axis O; the object side surface 21 of the second lens L2 is convex at the near optical axis O, and the image side surface 22 of the second lens L2 is concave or convex at the near optical axis O; the object side surface 31 of the third lens L3 is convex at the near optical axis O, and the image side surface 32 of the third lens L3 is convex at the near optical axis O; the object side surface 41 of the fourth lens L4 is concave at the near optical axis O, and the image side surface 42 of the fourth lens L4 is concave at the near optical axis O; the object side surface 51 of the fifth lens L5 is convex at the near optical axis O, and the image side surface 52 of the fifth lens L5 is convex at the near optical axis O; the object side surface 61 of the sixth lens L6 is convex at the near optical axis O, and the image side surface 62 of the sixth lens L6 is concave at the near optical axis O; the object side surface 71 of the seventh lens is concave at the near optical axis O, and the image side surface 72 of the seventh lens is convex at the near optical axis O; the object side surface 81 of the eighth lens L8 is concave at the near optical axis O, and the image side surface 82 of the eighth lens L8 is convex or concave at the near optical axis O.

[0079] In some embodiments, the optical lens 100 can be applied to terminal devices such as smart phones, smart tablets, monitoring devices, etc., and of course, can also be applied to, for example, vehicle-mounted devices, vehicles, etc., especially vehicles with ADAS assisted driving function, so the materials of 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 can all be selected as glass, so as to reduce the temperature sensitivity of the optical lens while having good optical effect, so that it can be used in different temperatures and environments. Of course, when the optical lens 100 is applied to terminal devices such as smart phones, smart tablets, etc., the first lens L1 to the eighth lens L8 can also be plastic lenses to achieve the lightness and thinness of the optical lens 100 while being easier to process complex lens surface shapes.

[0080] In some embodiments, the optical lens 100 further includes a diaphragm 102, which can be an aperture diaphragm and / or a field diaphragm, and can be arranged between the image side 32 of the third lens L3 and the object side 41 of the fourth lens L4 of the optical lens 100, that is, the design of the middle diaphragm is adopted. It can be understood that in other embodiments, the diaphragm 102 can also be arranged between other lenses, and the arrangement is adjusted according to the actual situation, which is not specifically limited in the present embodiment.

[0081] In some embodiments, the optical lens 100 further includes a filter 90, which is arranged between the eighth lens L8 and the imaging surface 101 of the optical lens 100. In the present embodiment, the filter 90 is selected as an infrared cut-off filter, so that light of other wavebands such as infrared light can be filtered out, and only visible light can pass through, so that the imaging is more in line with the visual experience of the human eye. Of course, the filter 90 can also be selected as an infrared band-pass filter, so that light of other wavebands such as visible light can be filtered out, and only infrared light can pass through, so as to improve the imaging quality; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can image and obtain better image effect in dim environments and other special application scenarios. It can be understood that the filter 90 can be made of optical glass coating film, colored glass or other material filter 90, which can be selected according to actual needs, and is not specifically limited in the present embodiment.

[0082] In some embodiments, the optical lens 100 can further include a protective glass (not shown), which can be arranged between the filter 90 and the imaging surface 101 of the optical lens 100. The protective glass can protect the lenses of the optical lens 100.

[0083] In some embodiments, the optical lens 100 satisfies the following relationship: 1.8 < tan(FOV) * TTL / Imgh < 2.0;

[0084] wherein, FOV is the maximum field of view angle of the optical lens 100, Imgh is the image height corresponding to the maximum field of view angle of the optical lens 100, and TTL is the distance from the object side surface of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis (i.e., the total length of the optical lens 100). Since the field of view angle of the optical lens 100 determines how much spatial information the optical lens 100 can obtain, by satisfying the above relationship, i.e., making the imaging surface 101 of the optical lens 100 and the field of view angle of the optical lens 100 be in a suitable proportion, a sufficient field of view angle can be provided to meet the requirement of a larger shooting angle when the terminal device is used for telephoto shooting, while reducing the angle of light entering the image sensor and improving the light sensing performance of the optical lens 100. At the same time, by limiting the relationship between the image height of the optical lens 100 and the total length of the optical lens 100, the design of each parameter of the optical lens 100 can be more reasonable, thereby achieving stable imaging of the optical lens 100 and meeting the miniaturization design requirement of the optical lens 100.

[0085] In some embodiments, the optical lens 100 satisfies the following relationship: -8 < Rs17 / f8 < 1.9; wherein, Rs17 is the curvature radius of the image side surface 82 of the eighth lens L8 at the optical axis, and f8 is the focal length of the eighth lens L8. Since the eighth lens L8 has negative refractive power, by limiting the ratio of the curvature radius of the image side surface 82 of the eighth lens L8 at the optical axis to the focal length of the eighth lens L8, the aberration caused by the folding of light by the lens group before the eighth lens L8 can be compensated, and the problem of under-correction of aberration can be reduced. At the same time, since the image side surface 82 of the eighth lens L8 is closest to the imaging surface, by reasonably controlling the surface shape thereof at the near optical axis, the deflection angle of the light before imaging can be effectively controlled. Therefore, satisfying the above relationship can also effectively shrink the width of the light bundle and reduce the angle of the chief ray incident to the imaging surface of the optical lens.

[0086] In some embodiments, the optical lens 100 satisfies the following relationship: 14 < Rs1 / SAGs1 < 129;

[0087] Rs1 / SAGs1<0.5, wherein Rs1 is a radius of curvature of the object side surface 11 of the first lens L1 at the optical axis, and SAGs1 is a distance in the direction of the optical axis from the intersection of the object side surface 11 of the first lens L1 with the optical axis to the maximum effective semi-aperture of the object side surface 11 of the first lens L1 (i.e. the sagittal height of the object side surface 11 of the first lens L1, which is opposite to the direction of the optical axis). The first lens L1 provides a negative refractive power for the optical lens 100, and by limiting the ratio of the radius of curvature of the object side surface 11 of the first lens L1 at the optical axis to the sagittal height of the object side surface 11 of the first lens L1, the lens surface shape closest to the object side can be effectively controlled, which is beneficial to capturing more light into the optical lens 100, and achieving high-pixel imaging of the optical lens 100. When the ratio is below the lower limit of the relationship, the absolute value of the sagittal height of the object side surface 11 of the first lens L1 is too large, causing the object side surface 11 of the first lens L1 to be too curved, which is prone to ghosting and is not conducive to improving the imaging quality of the optical lens 100. If the ratio exceeds the upper limit of the relationship, the absolute value of the radius of curvature of the object side surface 11 of the first lens L1 is too large, causing the object side surface 11 of the first lens L1 to be too flat, which is not conducive to controlling the surface shape of the object side surface 11 of the first lens L1, and further not conducive to the processing of the first lens L1.

[0088] In some embodiments, the fourth lens L4 and the fifth lens L5 form a cemented lens, and the optical lens 100 satisfies the following relationship: 2<|f45 / f|<7.5; wherein f45 is the combined focal length of the fourth lens L4 and the fifth lens L5, and f is the focal length of the optical lens 100. The fourth lens L4 provides a negative refractive power for the optical lens 100, and the fifth lens L5 provides a positive refractive power for the optical lens 100. By using a structure in which two lenses with one positive and one negative refractive power are cemented, the mutual correction of aberrations is facilitated. When the upper limit of the relationship is exceeded, the absolute value of the combined focal length of the cemented lens is too large, the refractive power is too small, which is prone to produce large edge aberrations and chromatic aberrations, and is not conducive to improving the resolution performance of the optical lens 100. When the lower limit of the relationship is exceeded, the overall refractive power of the fourth lens L4 and the fifth lens L5 is too strong, which is prone to cause serious astigmatism of the lens group, and is not conducive to improving the imaging quality of the optical lens 100.

[0089] In some embodiments, the optical lens 100 satisfies the following relationship: 4.5 < f3 / CT3 < 5.2; where f3 is the focal length of the third lens L3, and CT3 is the thickness of the third lens L3 on the optical axis (i.e., the center thickness of the third lens L3). By reasonably matching the center thickness of the third lens L3 and the focal length of the third lens L3, the tolerance sensitivity of the center thickness of the third lens L3 can be reduced, thereby reducing the processing difficulty of the single lens, improving the assembly yield of the optical lens 100, and further reducing the production cost. When exceeding the upper limit of the relationship, the optical lens 100 is too sensitive to the center thickness of the third lens L3, and the processing of the single lens is difficult to meet the required tolerance requirement, thereby reducing the assembly yield of the optical lens 100; when lower than the lower limit of the relationship, the center thickness of the third lens L3 is too large under the premise of meeting the optical performance, and since the density of the glass lens is large, the weight of the lens is large, which is not conducive to the miniaturization and lightweight design of the optical lens 100.

[0090] In some embodiments, the optical lens 100 satisfies the following relationship: 22mm < TTL / FNO ≤ 25mm; where FNO is the aperture number of the optical lens 100. In this way, while meeting the miniaturization requirement, the aperture of the optical lens 100 is increased, so that the optical lens 100 achieves a large-aperture effect. When exceeding the upper limit of the relationship, the total length of the optical lens 100 is too large, which is not conducive to the miniaturization design requirement of the optical lens 100, and when lower than the lower limit of the relationship, the aperture number of the optical lens 100 is increased, the aperture is reduced, which leads to insufficient light quantity of the optical lens 100, and the illumination of the optical lens 100 is reduced, which affects the high-pixel imaging effect and is not conducive to the large-aperture imaging of the optical lens 100.

[0091] In some embodiments, the optical lens 100 satisfies the following relationship: -56mm < f7*f8 / f < -34mm; where f7 is the focal length of the seventh lens L7. Since the seventh lens L7 provides positive refractive power for the optical lens 100, and the eighth lens L8 provides negative refractive power for the optical lens 100, by limiting the optical lens 100 to satisfy the relationship, the aberrations generated by each other can be corrected, and the refractive power of the seventh lens L7 and the eighth lens L8 in the optical lens 100 can be reasonably balanced, which is conducive to expanding the width of the light beam, so that the width of the light beam of a larger angle is expanded after passing through the first lens L1 to the sixth lens L6, thereby effectively utilizing the refractive power of the seventh lens L7 and the eighth lens L8, fully incident the wide light beam to the imaging surface 101 of the optical lens 100, so that the optical lens 100 has a wider field of view, which is conducive to realizing high-pixel imaging.

[0092] In some embodiments, the optical lens 100 satisfies the following relationship: -41 < (Rs14+Rs15) / CT7 < -13; where Rs14 is the radius of curvature of the object side surface 71 of the seventh lens L7 at the optical axis, Rs15 is the radius of curvature of the image side surface 72 of the seventh lens L7 at the optical axis, and CT7 is the thickness of the seventh lens L7 on the optical axis (i.e., the central thickness of the seventh lens L7).

[0093] By limiting through the relationship, it is beneficial to reasonably control the surface shape variation of the seventh lens L7 and reduce the risk of ghosting. When the upper limit of the relationship is exceeded, the central thickness of the seventh lens L7 is too large, the eccentricity sensitivity of the optical lens 100 is increased, and the assembly of the optical lens 100 is not conducive. When the lower limit of the relationship is exceeded, the surface shape of the seventh lens L7 is too curved, which is not conducive to processing.

[0094] The optical lens 100 of the present embodiment will be described in detail below in combination with specific parameters.

[0095] First embodiment

[0096] The structural schematic diagram of the optical lens 100 disclosed by the first embodiment of the present application is shown in Figure 1 The optical lens 100 includes, in order from the object side to the image side along the optical axis O, 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, and a filter 90.

[0097] In the present embodiment, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive 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.

[0098] Further, the object side surface 11 and the image side surface 12 of the first lens L1 are both concave at the near optical axis O; the object side surface 21 and the image side surface 22 of the second lens L2 are respectively convex and concave at the near optical axis O; the object side surface 31 and the image side surface 32 of the third lens L3 are both convex at the near optical axis O; the object side surface 41 and the image side surface 42 of the fourth lens L4 are both concave at the near optical axis O; the object side surface 51 and the image side surface 52 of the fifth lens L5 are both convex at the near optical axis O; the object side surface 61 and the image side surface 62 of the sixth lens L6 are respectively convex and concave at the optical axis O; the object side surface 71 and the image side surface 72 of the seventh lens L7 are respectively concave and convex at the optical axis O; and the object side surface 81 and the image side surface 82 of the eighth lens L8 are respectively concave and convex at the optical axis O.

[0099] Exemplarily, the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the eighth lens L8 are all glass spherical lenses, and the second lens L2 and the seventh lens L7 can be glass aspherical lenses. In this way, the combination of spherical lenses and aspherical lenses can improve high-order aberrations and further improve imaging quality. In addition, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

[0100] Specifically, taking the focal length f of the optical lens 100 as 22.547 mm, the aperture number FNO of the optical lens 100 as 1.6, the maximum field of view angle FOV of the optical lens 100 as 33.3 deg, and the total length TTL of the optical lens as 40 mm as examples, 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 are arranged in the order of the elements in Table 1 from top to bottom in sequence from the object side to the image side. In the same lens, the surface with a smaller surface serial number is the object side surface of the lens, and the surface with a larger surface serial number is the image side surface of the lens, for example, the surface serial numbers 1 and 2 correspond to the object side surface and the image side surface of the first lens L1 respectively. The Y radius in Table 1 is the radius of curvature of the object side surface or the image side surface with the corresponding surface serial number at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens at the optical axis O, and the second value is the distance from the image side surface of the lens to the vertex of the next surface at the optical axis O. The value in the "thickness" parameter column of the stop 102 is the distance from the vertex of the stop 102 to the vertex of the next surface at the optical axis O. 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 O. When the value is negative, it indicates that the stop 102 is arranged on the image side of the vertex of the next surface. If the thickness of the stop 102 is positive, the 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 mm. The refractive index and Abbe number in Table 1 are obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 546.07 nm.

[0101] In addition, the surface serial numbers 1 and 2 in Table 1 and Table 2 correspond to the object side surface 11 and the image side surface 12 of the first lens L1 respectively, the surface serial numbers 3 and 4 correspond to the object side surface 21 and the image side surface 22 of the second lens L2 respectively, and so on, and the surface serial numbers 16 and 17 correspond to the object side surface 81 and the image side surface 82 of the eighth lens L8 respectively.

[0102] In the first embodiment, the fourth lens L4 and the fifth lens L5 form a cemented lens, and the object side surface and the image side surface of the second lens L2 and the seventh lens L7 among the first lens L1 to the eighth lens L8 are aspherical surfaces. The surface type x of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0103]

[0104] 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.

[0105] Table 1

[0106]

[0107]

[0108] Table 2

[0109] Surface No. 3 4 14 15 K -3.0627E+00 1.5493E+01 -5.1433E+01 2.0839E+00 A4 -3.5497E-05 -7.0231E-05 -5.7469E-04 -2.6616E-04 A6 -7.4326E-07 -6.3439E-07 4.6546E-06 4.2506E-06 A8 4.3351E-09 -2.5553E-09 -3.6842E-07 -5.7863E-07 A10 -1.1503E-10 1.0340E-10 2.1617E-08 3.8653E-08 A12 8.5881E-13 -2.9028E-12 -1.0345E-09 -1.4260E-09 A14 1.9400E-15 3.6737E-14 2.8471E-11 2.7745E-11 A16 -2.2836E-17 -1.7163E-16 -3.1161E-13 -2.1912E-13

[0110] Please see Figure 2 (A) in the middle Figure 2 Figure (A) shows the longitudinal spherical aberration curves of the optical lens 100 in the first embodiment at wavelengths of 656.27 nm, 587.56 nm, 546.07 nm, 486.13 nm and 435.84 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.

[0111] Please see Figure 2 (B) in the middle Figure 2 (B) in the figure shows the light astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 546.07 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.

[0112] 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 546.07 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 2As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.07nm.

[0113] Second Embodiment

[0114] 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, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0115] In this embodiment, the refractive power of the first lens L1 to the eighth lens L8 and the surface design near the optical axis are the same as in the first embodiment, and will not be repeated here.

[0116] 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 587.6 nm, and the focal length is obtained at a reference wavelength of 546.07 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.

[0117] In the second embodiment, among the first lens L1 to the eighth lens L8, the object-side surface and image-side surface of the second lens L2 and the seventh lens L7 are both aspherical. 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 A4, A6, A8, A10, A12, A14, and A16 of the aspherical surface.

[0118] Table 3

[0119]

[0120] Table 4

[0121] Surface No. 3 4 14 15 K -4.5414E+00 1.5494E+01 -9.6563E+01 5.3454E+00 A4 -3.9787E-05 -7.0724E-05 -4.3612E-04 -3.4040E-04 A6 -6.6330E-07 -6.6172E-07 -1.5011E-07 3.6854E-06 A8 2.2821E-09 -2.5554E-09 -3.2535E-07 -5.7701E-07 A10 -7.0156E-11 1.0128E-10 2.5370E-08 3.8219E-08 A12 1.0141E-12 -2.8104E-12 -1.1644E-09 -1.3793E-09 A14 -6.5902E-15 3.6481E-14 2.8106E-11 2.6234E-11 A16 2.4222E-17 -2.0493E-16 -2.6706E-13 -2.0238E-13

[0122] Please see Figure 4 (A) in the middle Figure 4 Figure (A) shows the longitudinal spherical aberration curves of the optical lens 100 in the second embodiment at wavelengths of 656.27 nm, 587.56 nm, 546.07 nm, 486.13 nm and 435.84 nm. Figure 4In (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 4 As can be seen from (A) in the second 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.

[0123] Please see Figure 4 (B) in the middle Figure 4 (B) in the figure shows the light astigmatism diagram of the optical lens 100 in the second embodiment at a wavelength of 546.07 nm. The horizontal axis along the X-axis represents the focus shift in mm, and the vertical axis along the Y-axis represents the field of view in degrees. 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 4 As can be seen from (B) in the figure, the astigmatism of the optical lens 100 is well compensated at this wavelength.

[0124] Please see Figure 4 (C) in the middle, Figure 4 (C) in the figure is a distortion curve of the optical lens 100 in the second embodiment at a wavelength of 546.07 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 4 As can be seen from (C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.07nm.

[0125] Third Embodiment

[0126] 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, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0127] In this embodiment, except for the sixth lens L6 which has positive refractive power, the refractive power of the other lenses is the same as in the first embodiment, and will not be repeated here. Furthermore, 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 can be referred to the first embodiment, and will not be repeated here.

[0128] 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 aforementioned 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 587.6 nm, and the focal length is obtained at a reference wavelength of 546.07 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 aforementioned first embodiment, which will not be repeated here.

[0129] In the third embodiment, among the first lens L1 to the eighth lens L8, the object-side surface and image-side surface of the second lens L2 and the seventh lens L7 are both aspherical. 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 A4, A6, A8, A10, A12, A14, and A16 of the aspherical surface.

[0130] Table 5

[0131]

[0132]

[0133] Table 6

[0134] Surface No. 3 4 14 15 K -1.6110E+00 1.1914E+01 -5.1111E+00 2.4593E+00 A4 -8.9383E-06 -3.3882E-05 -5.2452E-04 -3.1894E-04 A6 -2.2668E-07 -2.4924E-07 -1.6192E-06 2.8305E-06 A8 -1.4263E-10 -4.6140E-09 -3.8162E-07 -4.1112E-07 A10 -3.1763E-11 1.1604E-10 3.2652E-08 2.7220E-08 A12 3.9574E-13 -2.6504E-12 -1.7154E-09 -9.8592E-10 A14 -4.9385E-15 2.6653E-14 4.7056E-11 1.8700E-11 A16 3.4786E-17 -9.4996E-17 -5.2281E-13 -1.4501E-13

[0135] 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 found in the second embodiment regarding... Figure 4 (A) Figure 4 (B) Figure 4 The content described in (C) will not be repeated here.

[0136] Fourth embodiment

[0137] 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, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0138] Furthermore, the refractive power and surface design of the first lens L1 to the eighth lens L8 are consistent with those of the third embodiment, and will not be repeated here.

[0139] 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 aforementioned 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 obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 546.07 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 aforementioned first embodiment, which will not be repeated here.

[0140] In the fourth embodiment, among the first lens L1 to the eighth lens L8, the object-side surface and image-side surface of the second lens L2 and the seventh lens L7 are both aspherical. 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 A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical lens in the fourth embodiment.

[0141] Table 7

[0142]

[0143] Table 8

[0144] Surface No. 3 4 14 15 K -1.4718E+00 1.5324E+01 9.9692E-02 2.8262E+00 A4 -6.5617E-06 -2.3285E-05 -5.4810E-04 -3.7850E-04 A6 -1.1284E-07 -1.2262E-07 -1.6546E-06 2.4182E-06 A8 3.9521E-10 -4.0140E-09 -4.4383E-07 -4.1396E-07 A10 -2.6561E-11 1.1643E-10 3.6338E-08 2.6984E-08 A12 3.7150E-13 -2.4724E-12 -1.8126E-09 -9.6177E-10 A14 -3.1777E-15 2.5293E-14 4.7212E-11 1.7880E-11 A16 1.3732E-17 -1.0102E-16 -5.0259E-13 -1.3632E-13

[0145] 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 found in the second embodiment regarding... Figure 4 (A) Figure 4 (B) Figure 4 The content described in (C) will not be repeated here.

[0146] Fifth embodiment

[0147] The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of this application is shown below. Figure 9As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 90 arranged sequentially along the optical axis O from the object side to the image side.

[0148] Furthermore, the refractive power of the first lens L1 to the eighth lens L8 is consistent with that of the first embodiment. Among the first lens L1 to the eighth lens L8, except that the image-side surface of the second lens L2 is convex near the optical axis and the image-side surface of the eighth lens L8 is concave near the optical axis, the surface shapes of the other lenses are consistent with those of the aforementioned embodiment.

[0149] 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 aforementioned 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 obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 546.07 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 aforementioned first embodiment, which will not be repeated here.

[0150] In the fifth embodiment, among the first lens L1 to the eighth lens L8, the object-side surface and image-side surface of the second lens L2 and the seventh lens L7 are both aspherical. 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 A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in the fifth embodiment.

[0151] Table 9

[0152]

[0153]

[0154] Table 10

[0155] Surface No. 3 4 14 15 K -4.9554E+00 9.9000E+01 -7.5667E+01 7.3130E+01 A4 1.5403E-06 2.1164E-06 -6.4874E-05 -6.3707E-05 A6 -5.3246E-08 -4.0959E-08 -1.0079E-06 -7.3292E-07 A8 -2.8781E-10 -6.9805E-11 -3.0590E-09 -1.4177E-09 A10 -1.8433E-13 -1.9044E-12 3.6089E-11 -1.9583E-11 A12 -5.2759E-14 -5.3622E-14 -8.0080E-13 -3.0093E-13 A14 -7.3415E-16 -5.8246E-16 -1.5519E-14 -1.4088E-14 A16 6.0700E-18 5.8461E-18 5.0638E-17 2.0987E-16

[0156] 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 found in the second embodiment regarding...Figure 4 (A) Figure 4 (B) Figure 4 The content described in (C) will not be repeated here.

[0157] Refer to Table 11, which summarizes the ratios of the relationships in the first to fifth embodiments of this application.

[0158] Table 11

[0159] Relationship / Embodiment First Embodiment Second Embodiment Third Embodiment Fourth Embodiment Fifth Embodiment 1.8 < tan(FOV) * TTL / ImgH < 2.0 1.942 1.942 1.942 1.942 1.942 -8 < Rs17 / f8< 1.9 0.818 1.220 1.885 1.566 -7.986 14 < Rs1 / SAGs1 < 129 128.761 25.493 53.870 41.475 14.519 2 < |f45 / f| < 7.5 3.967 4.419 7.194 5.273 2.292 4.5 < f3 / CT3 < 5.2 4.530 4.748 5.101 4.758 4.592 22 mm < TTL / FNO ≤ 25 mm 25.00 mm 24.24 mm 22.08 mm 22.12 mm 25.00 mm - 56 mm < f7*f8 / f < -34 mm -55.665 mm -53.190 mm -38.876 mm -43.965 mm -34.615 mm -41 < (Rs14 + Rs15) / CT7 < -13 -14.285 -36.243 -13.432 -16.943 -40.660

[0160] Please see Figure 11 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 fifth 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 high pixel and wide-angle functions while also meeting 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.

[0161] 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, in-vehicle device, drone, monitor, etc. Figure 12 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.

[0162] Please see Figure 13 The terminal device 300 can also be a vehicle. In this case, the device body 301 can be the vehicle body, and the camera module 200 can be installed on the vehicle body, for example, inside or outside the vehicle body.

[0163] 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, it enables the terminal device 300 to meet the design requirements of miniaturization while having high pixel count and wide-angle capabilities. Since the aforementioned technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0164] The optical lens, the camera module and the terminal device disclosed in the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the optical lens, the camera module and the terminal device of the present application and the core idea thereof. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the embodiments should not be understood as a limitation on the present application.

Claims

1. An optical lens characterized in that, There are 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 in sequence along an optical axis from an object side to an image side; The first lens has negative refractive power, and both the object side surface and the image side surface of the first lens are concave at a near optical axis; The second lens has positive refractive power, and the object side surface of the second lens is convex at a near 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 at a near optical axis; The fourth lens has negative refractive power, and both the object side surface and the image side surface of the fourth lens are concave at a near optical axis; The fifth lens has positive refractive power, and both the object side surface and the image side surface of the fifth lens are convex at a near optical axis; The sixth lens has refractive power, and the object side surface of the sixth lens is convex at a near optical axis, and the image side surface of the sixth lens is concave at a near optical axis; The seventh lens has positive refractive power, and the object side surface of the seventh lens is concave at a near optical axis, and the image side surface of the seventh lens is convex at a near optical axis; The eighth lens has negative refractive power, and the object side surface of the eighth lens is concave at a near optical axis; The optical lens satisfies the following relationship: 1.8 < tan(FOV) * TTL / Imgh < 2.0; Wherein, FOV is the maximum field of view angle of the optical lens, Imgh is the image height corresponding to the maximum field of view angle of the optical lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.

2. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: -8 < Rs17 / f8 < 1.9; Wherein, Rs17 is the curvature radius of the image side surface of the eighth lens at the optical axis, and f8 is the focal length of the eighth lens.

3. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 14 < Rs1 / SAGs1 < 129; Wherein, Rs1 is the curvature radius of the object side surface of the first lens at the optical axis, and SAGs1 is the distance from the intersection of the object side surface of the first lens and the optical axis to the maximum effective half radius of the object side surface of the first lens in the direction of the optical axis.

4. The optical lens of claim 1, wherein, The fourth lens and the fifth lens constitute a cemented lens, and the optical lens satisfies the following relationship: 2 < |f45 / f| < 7.5; Wherein, f45 is the combined focal length of the fourth lens and the fifth lens, and f is the focal length of the optical lens.

5. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 4.5 < f3 / CT3 < 5.2; Wherein, f3 is the focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis.

6. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 22 mm < TTL / FNO ≤ 25 mm; Wherein, FNO is the aperture number of the optical lens.

7. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: -56 mm < f7 * f8 / f < -34 mm; Wherein, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f is the focal length of the optical lens.

8. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: -41 < (Rs14 + Rs15) / CT7 < -13; Wherein, Rs14 is the radius of curvature of the object side surface of the seventh lens at the optical axis, Rs15 is the radius of curvature of the image side surface of the seventh lens at the optical axis, and CT7 is the thickness of the seventh lens on the optical axis.

9. An image capture module, comprising: The camera module comprises an image sensor and the optical lens according to any one of claims 1-8, and the image sensor is arranged on the image side of the optical lens.

10. A terminal device, comprising: The device body comprises a camera module according to claim 9, and the camera module is arranged on the device body.

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