Optical lens, camera module and terminal equipment

Abstract

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises six lenses, the first lens has negative refractive power, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface; the second lens has negative refractive power, and the object side surface and the image side surface of the second lens are respectively a convex surface and a concave surface; the third lens has positive refractive power, and the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has negative refractive power, and the object side surface and the image side surface of the fifth lens are concave surfaces; the sixth lens has positive refractive power, and the object side surface and the image side surface of the sixth lens are convex surfaces; the optical lens satisfies the following relational expression: 195 default; a FOVlt; 215deg, FNOlt, 215deg, FNOlt; and 1.7. According to the optical lens, the camera module and the terminal equipment, a wide angle can be achieved, and meanwhile good imaging quality can be achieved in a weak light environment.

Description

Technical Field

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

[0002] In recent years, with the rapid development of automotive assisted driving lenses, wide-angle camera lenses have been increasingly widely used in cars, and the requirements for wide-angle camera lenses have also been continuously improved, requiring a larger field of view and clearer resolution. However, the current wide-angle camera lenses have poor shooting quality in low-light environments such as night scenes and rainy days, which greatly affects the user's shooting experience. Summary of the invention

[0003] The embodiments of the present application disclose an optical lens, a camera module and a terminal device, which can achieve wide-angle imaging while also having good imaging quality in a low-light environment.

[0004] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical lens, which has a total of six lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis;

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

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

[0007] The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are both convex surfaces at the near optical axis;

[0008] The fourth lens has refractive power, and the object side surface and the image side surface of the fourth lens are both convex surfaces near the optical axis;

[0009] The fifth lens has negative refractive power, and the object side surface and the image side surface of the fifth lens are both concave surfaces at the near optical axis;

[0010] The sixth lens has positive refractive power, and the object side surface and the image side surface of the sixth lens are both convex surfaces near the optical axis;

[0011] The optical lens satisfies the following relationship:

[0012] 195deg <FOV<215deg、FNO<1.7;

[0013] Among them, FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0014] In the optical lens provided by the present application, in order to achieve wide-angle while also having good imaging quality in low-light environments, a first lens with negative refractive power is adopted. With the design that its object side and image side are convex and concave respectively, it is beneficial for large-angle incident light to enter the first lens, effectively expanding the field of view angle range, and thus facilitating the wide-angle of the optical lens. The second lens has negative refractive power. With the design that its object side and image side are convex and concave respectively, it is beneficial for the light emitted from the second lens to enter the third lens smoothly. The third lens has positive refractive power. With the design that its object side and image side are both convex, it is beneficial for reasonably distributing the refractive power of the optical lens and effectively correcting the aberration of the optical lens. By setting both the object side and image side of the fourth lens to be convex, it helps to converge the light of the optical lens, is beneficial for shortening the total length of the optical lens, and realizes miniaturized design. The fifth lens has negative refractive power. With the design that its object side and image side are both concave, it can cooperate with the fourth lens, is beneficial for correcting chromatic aberration, and reducing the risk of ghost images. The sixth lens has positive refractive power. With the design that its object side and image side are both convex, it is beneficial for correcting aberration, reducing the sensitivity of the optical lens, and improving imaging quality.

[0015] The optical lens satisfies the relationship 195deg < FOV < 215deg. By reasonably setting the maximum field of view angle of the optical lens, a larger field of view angle can be provided for the optical lens to meet the larger field of view range of the wide-angle camera lens.

[0016] The optical lens satisfies the relationship FNO < 1.7. By limiting the aperture number of the optical lens, it can meet the characteristic of the optical lens having a large aperture, improve the light input, improve the clarity of imaging, and enable it to have good shooting quality in low-light environments such as night scenes and rainy days.

[0017] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0018] 1.9 < IMGH / F < 2.2, and / or, 6 < TTL / IMGH < 7, and / or, 13.5 < TTL / F < 14;

[0019] Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, F is the focal length of the optical lens, and TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis (i.e., the total length of the optical lens).

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

[0021] |F45 / F| > 5, and / or, 1.4 < F3 / F6 < 1.9, and / or, -5.3 < F1 / F < -4.5;

[0022] Wherein, F is the focal length of the optical lens, F45 is the combined focal length of the fourth lens and the fifth lens, F1 is the focal length of the first lens, F3 is the focal length of the third lens, and F6 is the focal length of the sixth lens.

[0023] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0024] 2.3 < SD1 / IMGH < 2.9, and / or, |SAGS4 / SAGS3| > 3, and / or, 1.1 < SD4 / IMGH < 1.35;

[0025] Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, SAGS3 is the distance from the intersection of the object side of the second lens and the optical axis to the distance on the optical axis of the maximum effective aperture of the object side of the second lens (i.e., the sag height of the object side of the second lens), SAGS4 is the distance from the intersection of the image side of the second lens and the optical axis to the distance on the optical axis of the maximum effective aperture of the image side of the second lens (i.e., the sag height of the image side of the second lens), and SD4 is half of the maximum effective aperture of the image side of the second lens.

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

[0027] 2 < CT4 / CT5 < 2.5, and / or, 1 < CT12 / (CT1 + CT2) < 1.2, and / or, 1.45 < ET1 / CT1 < 1.8;

[0028] Wherein, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens (i.e., the air gap between the first lens and the second lens), CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and ET1 is the distance on the optical axis from the maximum effective aperture of the object side of the first lens to the maximum effective aperture of the image side of the first lens (i.e., the edge thickness of the first lens).

[0029] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0030] 3 < R1 / R2 < 5, and / or, 4 < R3 / R4 < 7, and / or, -2.5 < R6 / R7 < -1;

[0031] Wherein, R1 is the curvature radius of the object side surface of the first lens on the optical axis, R2 is the curvature radius of the image side surface of the first lens on the optical axis, R3 is the curvature radius of the object side surface of the second lens on the optical axis, R4 is the curvature radius of the image side surface of the second lens on the optical axis, R6 is the curvature radius of the image side surface of the third lens on the optical axis, and R7 is the curvature radius of the object side surface of the fourth lens on the optical axis.

[0032] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0033] -6 < F1 / CT1 < -4, and / or, 0.7 < SAGS1 / ET1 < 1.05;

[0034] Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, SAGS1 is the distance from the intersection point of the object side surface of the first lens and the optical axis to the maximum effective aperture of the object side surface of the first lens on the optical axis (i.e., the sagitta of the object side surface of the first lens), and ET1 is the distance in the optical axis direction from the maximum effective aperture of the object side surface of the first lens to the maximum effective aperture of the image side surface of the first lens (i.e., the edge thickness of the first lens).

[0035] As an optional implementation manner, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relational expressions:

[0036] 28deg < FOV*IMGH / TTL < 35deg, and / or, 14deg < FOV*F / TTL < 16deg;

[0037] Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, 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 (i.e., the total length of the optical lens), and F is the focal length of the optical lens.

[0038] In a second aspect, the present application discloses an imaging module, the imaging module includes an image sensor and an optical lens as described in the first aspect above, and the image sensor is disposed on the image side of the optical lens.

[0039] In a third aspect, the present application further discloses a terminal device, the terminal device includes a housing and an imaging module as described in the second aspect above, and the imaging module is disposed in the housing.

[0040] Compared with the prior art, the beneficial effects of the present application are as follows:

[0041] In the optical lens provided by the present application, in order to achieve wide-angle while also having good imaging quality in low-light environments, a first lens with negative refractive power is adopted. With the design that its object side and image side are convex and concave respectively, it is beneficial for incident light at large angles to enter the first lens, effectively expanding the field of view angle range, which is conducive to the wide-angle of the optical lens. The second lens has negative refractive power, and with the design that its object side and image side are convex and concave respectively, it is beneficial for the light emitted from the second lens to enter the third lens smoothly. The third lens has positive refractive power, and with the design that its object side and image side are both convex, it is beneficial for reasonably distributing the refractive power of the optical lens and effectively correcting the aberration of the optical lens. Setting both the object side and image side of the fourth lens as convex helps the light convergence of the optical lens, is conducive to shortening the total length of the optical lens, and achieving a miniaturized design. The fifth lens has negative refractive power, and with the design that its object side and image side are both concave, it can cooperate with the fourth lens, which is beneficial for correcting chromatic aberration and reducing the risk of ghost images. The sixth lens has positive refractive power, and with the design that its object side and image side are both convex, it is beneficial for correcting aberration, reducing the sensitivity of the optical lens, and improving the imaging quality.

[0042] The optical lens satisfies the relationship 195deg < FOV < 215deg. By reasonably setting the maximum field of view angle of the optical lens, a larger field of view angle can be provided for the optical lens to meet the larger field of view range of the wide-angle camera lens.

[0043] The optical lens satisfies the relationship FNO < 1.7. By limiting the aperture number of the optical lens, the characteristics of the optical lens with a large aperture can be satisfied, the light input amount can be increased, the imaging clarity can be improved, and it also has good shooting quality in low-light environments such as night scenes and rainy days. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0045] Figure 1 is a schematic structural diagram of the optical lens disclosed in Embodiment 1 of the present application;

[0046] Figure 2 is the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical lens disclosed in Embodiment 1 of the present application;

[0047] Figure 3is a schematic structural diagram of the optical lens disclosed in Example 2 of the present application;

[0048] Figure 4 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 2 of the present application;

[0049] Figure 5 is a schematic diagram of the structure of the optical lens disclosed in Example 3 of the present application;

[0050] Figure 6 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 3 of the present application;

[0051] Figure 7 is a schematic structural diagram of the optical lens disclosed in Example 4 of the present application;

[0052] Figure 8 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 4 of the present application;

[0053] Fig. 9 is a schematic structural diagram of the optical lens disclosed in Example 5 of the present application;

[0054] Fig.10 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 5 of the present application;

[0055] Fig.11 It is a structural schematic diagram of the camera module disclosed in this application;

[0056] Fig.12 It is a structural schematic diagram when the terminal device disclosed in this application is a car. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In this application, the terms "inside", "outside", etc. indicate positions or location relationships based on the positions or location relationships shown in the drawings. These terms are mainly used to better describe this 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.

[0059] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0060] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0062] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0063] See also Figure 1 In the optical lens 100 of the present application, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 are sequentially arranged along the optical axis from the object side to the image side. Light can enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in sequence from the object side of the first lens L1, and finally form an image on the imaging surface 101 of the optical lens 100.

[0064] Among them, the first lens L1 has negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power or negative refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has positive refractive power.

[0065] In the embodiment of the present application, the object-side surface 11 of the first lens L1 is convex at the near optical axis, and the image-side surface 12 of the first lens L1 is concave at the near optical axis; the object-side surface 21 of the second lens L2 is convex at the near optical axis, and the image-side surface 22 of the second lens L2 is concave at the near optical axis; the object-side surface 31 and the image-side surface 32 of the third lens L3 are both convex at the near optical axis; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are both convex at the near optical axis; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are both concave at the near optical axis; the object-side surface 61 and the image-side surface 62 of the sixth lens L6 are both convex at the near optical axis.

[0066] In the optical lens 100 provided in the present application, by adopting the first lens L1 with negative refractive power, and cooperating with the design that its object side surface and image side surface are convex and concave respectively, it is conducive to the incident light of large angle to enter the first lens L1, effectively expanding the field of view angle range, and thus facilitating the wide-angle of the optical lens 100; and the second lens L2 has negative refractive power, and cooperating with the design that its object side surface and image side surface are convex and concave respectively, it is conducive to the light emitted from the second lens L2 to smoothly enter the third lens L3; the third lens L3 has positive refractive power, and cooperating with the design that its object side surface and image side surface are both convex, it is conducive to the reasonable distribution of light The refractive power of the optical lens 100 can effectively correct the aberration of the optical lens 100; setting the object side surface and the image side surface of the fourth lens L4 as convex surfaces can help converge the light of the optical lens 100, shorten the total length of the optical lens 100, and achieve a miniaturized design; the fifth lens L5 has a negative refractive power, and with the design that its object side surface and image side surface are both concave surfaces, it can be cooperated with the fourth lens L4, which is beneficial to correct chromatic aberration and reduce the risk of ghost images; the sixth lens L6 has a positive refractive power, and with the design that its object side surface and image side surface are both convex surfaces, it is beneficial to correct aberration, reduce the sensitivity of the optical lens 100, and improve the imaging quality.

[0067] Optionally, all lenses in the optical lens 100 may be made of glass, or may be made of plastic, or some lenses may be made of glass and some lenses may be made of plastic. Preferably, the first lens L1 and the third lens L3 may be made of glass, and the other lenses may be made of plastic. By adopting a lens glass-plastic hybrid structure, the advantages of plastic lenses and glass lenses can be combined, so that the optical lens 100 has a good optical effect, reduces the temperature sensitivity of the optical lens 100, and can also reduce the overall weight of the optical lens 100, and can reduce the production cost of the optical lens 100.

[0068] Optionally, the first lens L1 and the third lens L3 may be spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be aspherical lenses. By combining spherical lenses and aspherical lenses, higher-order aberrations can be improved, thereby improving the imaging quality of the optical lens 100.

[0069] In some embodiments, the optical lens 100 may further include a diaphragm 102. The diaphragm 102 may be an aperture stop and / or a field stop, and it may be disposed 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. Of course, in other embodiments, the diaphragm 102 may also be disposed between other lenses, and the setting can be adjusted according to actual situations, and no specific limitation is made in this embodiment.

[0070] In some embodiments, the optical lens 100 may further include a filter 110. The filter 110 may be disposed between the image side 62 of the sixth lens L6 and the imaging surface 101 of the optical lens 100. Of course, in other embodiments, the filter 110 may also be disposed between other lenses, and the setting can be adjusted according to actual situations, and no specific limitation is made in this embodiment. In this embodiment, the filter 110 may be an infrared cut-off filter, so that light rays in other bands such as infrared light can be filtered out, and only visible light can pass through, making the imaging more in line with the visual experience of the human eye. Of course, the filter 110 may also be an infrared band-pass filter, so that light rays in other bands such as visible light can be filtered out, and only infrared light can pass through. By filtering out light rays in other bands such as visible light, the imaging quality is improved; and the optical lens 100 can be used as an infrared optical lens 100, that is, the optical lens 100 can also image and obtain good imaging effects in a dim environment and other special application scenarios. Preferably, the filter 110 may be made of glass. Of course, in other embodiments, the filter 110 may also be made of optical glass coating, or a filter 110 of other materials, which can be selected according to actual needs, and no specific limitation is made in this embodiment.

[0071] In some embodiments, the optical lens 100 may further include a protective glass 120. The protective glass 120 is disposed between the filter 110 and the imaging surface 101, and can be close to the image sensor during subsequent assembly, thereby playing a protective role.

[0072] In one embodiment, the optical lens 100 satisfies the relationship 195deg < FOV < 215deg, where FOV is the maximum field of view angle of the optical lens 100. By reasonably setting the maximum field of view angle of the optical lens 100, a larger field of view angle can be provided for the optical lens 100 to meet the larger field of view range of the wide-angle lens.

[0073] In one embodiment, the optical lens 100 may satisfy the relationship FNO < 1.7, where FNO is the aperture number of the optical lens 100. By defining the aperture number of the optical lens 100, the optical lens 100 can have the characteristic of a large aperture, improving the light input and the imaging clarity, and enabling it to have good shooting quality even in low-light environments such as night scenes and rainy days. More preferably, the optical lens 100 may satisfy the relationship 1.55 < FNO < 1.65, making the shooting quality of the optical lens 100 even better.

[0074] In one embodiment, the optical lens 100 may also satisfy the relationship 1.9 < IMGH / F < 2.2, where IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100, and F is the focal length of the optical lens 100. By reasonably configuring the ratio of the half image height to the focal length of the optical lens 100, it is beneficial for the optical lens 100 to meet the imaging requirements of high clarity, and at the same time, it is beneficial to achieve shooting within a larger field of view. When the optical lens 100 exceeds the upper limit of the above relationship, the focal length of the optical lens 100 is too short, which is not conducive to realizing the telephoto function of the optical lens 100, resulting in insufficient clarity for shooting distant scenes and affecting the imaging effect; when the optical lens 100 is below the lower limit of the above relationship, the focal length of the optical lens 100 is too long, which is not conducive to the wide-angleization of the optical lens 100 and it is difficult to shoot large-field scenes.

[0075] In one embodiment, the optical lens 100 satisfies the relationship 6 < TTL / IMGH < 7, where TTL is the total length 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. Satisfying the above relationship can reasonably control the image height of the optical lens 100, meet the large field of view angle of the optical lens 100, and at the same time, it is beneficial to control the total length of the optical lens 100, and is more conducive to realizing the characteristics of miniaturization and wide-angleization of the optical lens 100.

[0076] In one embodiment, the optical lens 100 satisfies the relationship 13.5 < TTL / F < 14, where TTL is the total length of the optical lens 100, and F is the focal length of the optical lens 100. Satisfying the above relationship can reasonably control the total length of the optical lens 100 and the focal length of the optical lens 100, so that the optical lens 100 has a reasonable focal length without causing the total length of the optical lens 100 to be too long, which is beneficial to realizing the miniaturization of the optical lens 100.

[0077] In one embodiment, the optical lens 100 satisfies the relation |F45 / F|>5, where F is the focal length of the optical lens 100, and F45 is the combined focal length of the fourth lens L4 and the fifth lens L5. By controlling the ratio of the combined focal length of the fourth lens L4 and the fifth lens L5 to the focal length of the optical lens 100 to satisfy the above relation, the refractive power of the combined lens formed by the fourth lens L4 and the fifth lens L5 can be reasonably controlled to contract light rays into the diaphragm 103, thereby facilitating the reduction of aberration and the improvement of imaging quality.

[0078] In one embodiment, the optical lens 100 satisfies the relation 1.4<F3 / F6<1.9, where F3 is the focal length of the third lens L3 and F6 is the focal length of the sixth lens L6. Satisfying the above relation is beneficial for the optical lens 100 to achieve a more reasonable refractive power distribution, can improve the light converging ability of the optical lens 100, adjust the light focusing position, and shorten the total length of the optical lens 100.

[0079] In one embodiment, the optical lens 100 satisfies the relation 2.3<SD1 / IMGH<2.9, where SD1 is half of the maximum effective aperture of the object side surface 11 of the first lens L1, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100. Satisfying the above relation enables the optical lens 100 to have a wide-angle characteristic without excessive increase in the aperture of the first lens L1, thereby facilitating the miniaturization of the optical lens 100.

[0080] In one embodiment, the optical lens 100 satisfies the relation 1.1<SD4 / IMGH<1.35, where SD4 is half of the maximum effective aperture of the image side surface 22 of the second lens L2, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100. By controlling the ratio of the semi-aperture of the image side surface 22 of the second lens L2 to the semi-image height of the optical lens 100, it can cooperate with the first lens L1 to facilitate the wide-angleization of the optical lens 100.

[0081] In one embodiment, the optical lens 100 satisfies the relation |SAGS4 / SAGS3|>3, where SAGS3 is the sagittal height of the object side surface 21 of the second lens L2, and SAGS4 is the sagittal height of the image side surface 22 of the second lens L2. Satisfying the above relation can enable the second lens L2 to correct the marginal aberration of the optical imaging system and can control the shape of the second lens L2, avoiding excessive curvature of the surface of the second lens L2, thereby facilitating the reduction of the processing difficulty of the lens.

[0082] In one embodiment, the optical lens 100 satisfies the relation 2 < CT4 / CT5 < 2.5, where CT4 is the thickness of the fourth lens L4 on the optical axis and CT5 is the thickness of the fifth lens L5 on the optical axis. By satisfying the above relation, the size of the cemented lens formed by the fourth lens L4 and the fifth lens L5 can be effectively controlled, the assembly difficulty of the lens group can be reduced, and a high space utilization rate can be achieved.

[0083] In one embodiment, the optical lens 100 satisfies the relation 1 < CT12 / (CT1 + CT2) < 1.2, where CT1 is the thickness of the first lens L1 on the optical axis, CT2 is the thickness of the second lens L2 on the optical axis, and CT12 is the air gap between the first lens L1 and the second lens L2. When the optical lens 100 exceeds the upper limit of the above relation, the air gap between the first lens L1 and the second lens L2 is too large, and there is a risk of increasing the field curvature; when the optical lens 100 is below the lower limit of the above relation, the total thickness of the first lens L1 and the second lens L2 on the optical axis is too large, which is not conducive to the miniaturized design of the optical lens 100.

[0084] In one embodiment, the optical lens 100 satisfies the relation 1.45 < ET1 / CT1 < 1.8, where ET1 is the edge thickness of the first lens L1 and CT1 is the thickness of the first lens L1 on the optical axis. By reasonably controlling the ratio of the edge thickness of the first lens L1 to the thickness of the first lens L1 on the optical axis, the thickness ratio of the first lens L1 can be reasonably controlled, thereby optimizing the surface shape of the first lens L1, which is beneficial to the effective convergence of large-angle incident light, and making the light passing through the first lens L1 have a small deflection angle, so as to reduce the generation of stray light, and further ensure good imaging performance.

[0085] In one embodiment, the optical lens 100 satisfies the relational expressions 3 < R1 / R2 < 5, 4 < R3 / R4 < 7, -2.5 < R6 / R7 < -1, R6 / R5 > -2, R7 / R8 > -10, R9 / R10 > -4, and R11 / R12 > -3. Herein, R1 is the radius of curvature of the object side surface 11 of the first lens L1 on the optical axis, R2 is the radius of curvature of the image side surface 12 of the first lens L1 on the optical axis, R3 is the radius of curvature of the object side surface 21 of the second lens L2 on the optical axis, R4 is the radius of curvature of the image side surface 22 of the second lens L2 on the optical axis, R5 is the radius of curvature of the object side surface 31 of the third lens L3 on the optical axis, R6 is the radius of curvature of the image side surface 32 of the third lens L3 on the optical axis, R7 is the radius of curvature of the object side surface 41 of the fourth lens L4 on the optical axis, R8 is the radius of curvature of the image side surface 42 of the fourth lens L4 on the optical axis, R9 is the radius of curvature of the object side surface 51 of the fifth lens L5 on the optical axis, R10 is the radius of curvature of the image side surface 52 of the fifth lens L5 on the optical axis, R11 is the radius of curvature of the object side surface 61 of the sixth lens L6 on the optical axis, and R12 is the radius of curvature of the image side surface 62 of the sixth lens L6 on the optical axis.

[0086] By satisfying the above relational expressions, the ratio between the radius of curvature of the object side surface and the image side surface of each lens on the optical axis can be reasonably matched, so that the surface type differences of each lens are reasonably set, which is beneficial to controlling the shape of each lens, correcting the aberration generated by itself, and improving the imaging quality.

[0087] In one embodiment, the optical lens 100 satisfies the relational expression -6 < F1 / CT1 < -4, where F1 is the focal length of the first lens L1 and CT1 is the thickness of the first lens L1 on the optical axis. By reasonably controlling the ratio between the focal length of the first lens L1 and the thickness of the first lens L1, it is beneficial to reasonably configure the refractive power of the first lens L1, effectively control the angle of light entering the first lens L1, and thus is beneficial to correcting aberration.

[0088] In one embodiment, the optical lens 100 satisfies the relational expression -4 < F2 / CT2 < -2, where F2 is the focal length of the second lens L2 and CT2 is the thickness of the second lens L2 on the optical axis. By satisfying this relational expression, the refractive power of the second lens L2 can cooperate with the refractive power of the first lens L1 to correct spherical aberration, so that the optical lens 100 has good imaging quality.

[0089] In one embodiment, the optical lens 100 satisfies the relational expression 0.8 < F3 / CT3 < 3, 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. It can reasonably configure the refractive power of the third lens L3, effectively control the deflection angle of light in the optical lens 100, and further reduce the sensitivity of the optical lens 100 and improve the resolution of the optical lens 100.

[0090] In one embodiment, the optical lens 100 satisfies the relation |F4 / CT4| > 1, where F4 is the focal length of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis. With such a setting, the thickness of the fourth lens L4 on the optical axis is reasonable, which is beneficial to the light weight of the optical lens 100. At the same time, it can prevent the center thickness of the fourth lens L4 from being too small, which may lead to great difficulty in the processing technology of the lens.

[0091] In one embodiment, the optical lens 100 satisfies the relation -20 < F5 / CT5 < -2, where F5 is the focal length of the fifth lens L5, and CT5 is the thickness of the fifth lens L5 on the optical axis. Satisfying the above relation enables the fifth lens L5 to cooperate with the fourth lens L4 to balance the high-order aberration and improve the quality of the optical lens 100.

[0092] In one embodiment, the optical lens 100 satisfies the relation 1 < F6 / CT6 < 2, where F6 is the focal length of the sixth lens L6, and CT6 is the thickness of the sixth lens L6 on the optical axis. Satisfying the above relation facilitates the correction of spherical aberration and chromatic aberration to improve the imaging quality of the optical lens 100.

[0093] In one embodiment, the optical lens 100 satisfies the relation 0.7 < SAGS1 / ET1 < 1.05, where SAGS1 is the sagittal height of the object side 11 of the first lens L1, and ET1 is the edge thickness of the first lens L1. Satisfying this relation can reasonably control the shape of the first lens L1, which is beneficial to reducing the assembly difficulty of the optical lens 100, thereby improving the structural stability of the optical lens 100.

[0094] In one embodiment, the optical lens 100 satisfies the relation 28deg < FOV*IMGH / TTL < 35deg, where FOV is the maximum field of view angle of the optical lens 100, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens 100, and TTL is the total length of the optical lens 100. By controlling the relationship between the maximum field of view angle of the optical lens 100, half of the image height corresponding to the maximum field of view angle, and the total length of the optical lens 100, the overall size of the optical lens 100 can be effectively shortened to adapt to more thin and light devices, and the maximum field of view angle of the optical lens 100 can be kept within a reasonable range, so that the optical lens 100 has better imaging quality. When the optical lens 100 exceeds the upper limit of the above relation, the maximum field of view angle of the optical lens 100 is too large, which is likely to cause distortion, relatively low contrast, affecting the imaging clarity, and the image height is too large, which is likely to increase the aberration, thus affecting the imaging quality of the optical lens 100; when the optical lens 100 is lower than the lower limit of the above relation, the total length of the optical lens 100 is too long, which is not conducive to the miniaturization of the optical lens 100.

[0095] In one embodiment, the optical lens 100 satisfies the relationship 14deg < FOV * F / TTL < 16deg, where FOV is the maximum field of view angle of the optical lens 100, F is the focal length of the optical lens 100, and TTL is the total length of the optical lens 100. Satisfying this relationship is beneficial to achieving wide-angle of the optical lens 100, meeting a larger field of view range, and at the same time is beneficial to achieving miniaturization of the optical lens 100.

[0096] In one embodiment, the optical lens 100 satisfies the relationships -5.3 < F1 / F < -4.5, -3 < F2 / F < -2, 3 < F3 / F < 4.5, |F4 / F| > 1, F5 / F > -20, 1 < F6 / F < 3, where F is the focal length of the optical lens 100, F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, F4 is the focal length of the fourth lens L4, F5 is the focal length of the fifth lens L5, and F6 is the focal length of the sixth lens L6. Satisfying the above formulas can make the optical power distribution of the optical lens 100 uniform and reasonable, the aberration is easy to correct, and the image quality is good.

[0097] The optical lens 100 of this embodiment will be described in detail below with specific parameters.

[0098] Embodiment 1

[0099] Figure 1 FIG. 13 is a schematic structural diagram of the optical lens 100 disclosed in Embodiment 1 of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter 110, and a protective glass 120 sequentially arranged along the optical axis from the object side to the image side. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, and the sixth lens L6 has a positive refractive power.

[0100] Specifically, taking the focal length F=0.94mm of the optical lens 100, the aperture number FNO=1.6 of the optical lens 100, and the maximum field of view FOV=212.9254deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements along the optical axis of the optical lens 100 from the object side to the image side are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side surface of the lens, and the surface with a larger surface number is the image side surface of the lens, such as surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 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 of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis. The value of the aperture 102 in the "Thickness" parameter column is the distance from the aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis. By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis. When the value is negative, it indicates that the aperture 102 is set on the image side of the next surface vertex. If the thickness of the aperture 102 is a positive value, the aperture 102 is on the object side of the next surface vertex. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, Abbe number, etc. in Table 1 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546.0740nm.

[0101] Table 1

[0102]

[0103] In Example 1, the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0104]

[0105] Among them, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the curvature of the aspheric surface at the optical axis, c=1 / Y (that is, the paraxial curvature c is the reciprocal of the curvature radius Y in Table 1 above); K is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 gives the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6.

[0106] Table 2

[0107]

[0108]

[0109] Figure 2 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 1 of the present application. Figure 2 (A) in FIG. 1 is a spherical aberration diagram of the optical lens 100 at wavelengths of 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm. The horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in the figure, the spherical aberration value of the optical lens 100 in Example 1 is better, which means that the imaging quality of the optical lens 100 in this embodiment is better.

[0110] Figure 2 (B) is the astigmatism diagram of the optical lens 100 in Example 1 at a wavelength of 546.0740 nm. The horizontal axis along the X-axis direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the field angle in degrees. T in the astigmatism diagram represents the curvature of the imaging surface 101 in the meridian 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, at this wavelength, the field curvature of the optical lens 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images, that is, the astigmatism of the optical lens 100 is well compensated.

[0111] Figure 2 (C) is a distortion diagram of the optical lens 100 in Example 1 at a wavelength of 546.0740 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view angle, in degrees. Figure 2 As can be seen from (C) in FIG. 1 , at this wavelength, the image deformation caused by the main light beam is small, and the distortion of the optical lens 100 is well corrected.

[0112] Example 2

[0113] Figure 3This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 2 of the present application. Specifically, taking the focal length F=1.02mm of the optical lens 100, the aperture number FNO=1.6 of the optical lens 100, and the maximum field angle FOV=195.02deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 3. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the refractive power of each lens and the correspondence between each face number and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0114] Table 3

[0115]

[0116] Table 4 gives the high-order coefficients of the aspheric mirror surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 that can be used in Example 2, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0117] Table 4

[0118]

[0119]

[0120] See also Figure 4 , Figure 4 (A) is a spherical aberration diagram of the optical lens 100 disclosed in Example 2 at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, 436 nm, and 410 nm. Figure 6 (B) and (C) are respectively the astigmatism diagram and distortion diagram of the optical lens 100 at a wavelength of 546 nm.

[0121] Depend on Figure 4 It can be seen from the (A) spherical aberration diagram, (B) astigmatism diagram, and (C) distortion diagram in the figure that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 of this embodiment has good imaging quality.

[0122] Example 3

[0123] Figure 5This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 3 of the present application. Specifically, taking the focal length F=0.9455mm of the optical lens 100, the aperture number FNO=1.63 of the optical lens 100, and the maximum field angle FOV=203deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 5. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the refractive power of each lens and the corresponding relationship between each face number and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0124] Table 5

[0125]

[0126]

[0127] Table 6 gives the high-order coefficients of the aspherical surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 that can be used in Example 3, wherein the surface shape of each aspherical surface can be defined by the formula given in Example 1.

[0128] Table 6

[0129]

[0130] See also Figure 6 ,Depend on Figure 6 As can be seen from the spherical aberration diagram (A), astigmatism diagram (B), and distortion diagram (C), the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in Example 2. Figure 4 (A) Figure 4 (B) Figure 4 The contents described in (C) will not be repeated here.

[0131] Example 4

[0132] Figure 7This is a schematic diagram of the structure of an optical lens 100 disclosed in Example 4 of the present application, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter 110, and a protective glass 120, which are sequentially arranged along the optical axis from the object side to the image side. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a negative refractive power, and the sixth lens L6 has a positive refractive power.

[0133] Specifically, taking the focal length F of the optical lens 100 = 0.9598 mm, the aperture number FNO of the optical lens 100 = 1.639, and the maximum field angle FOV of the optical lens 100 = 202 deg as an example, other parameters of the optical lens 100 are given in the following Table 7. The definition of each parameter can be obtained from the description of the aforementioned embodiment, and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.5618 nm, and the focal length is obtained at a reference wavelength of 546 nm.

[0134] Table 7

[0135]

[0136] Table 8 gives the high-order coefficients of the aspheric mirror surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 that can be used in Example 4, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0137] Table 8

[0138]

[0139]

[0140] See also Figure 8 , Figure 8 (A) is a spherical aberration diagram of the optical lens 100 disclosed in Example 4 at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm. Figure 6 (B) and (C) are respectively the astigmatism diagram and distortion diagram of the optical lens 100 at a wavelength of 546 nm.

[0141] Depend on Figure 8 It can be seen from the (A) spherical aberration diagram, (B) light astigmatism diagram, and (C) distortion diagram that the spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, so that the optical lens 100 of this embodiment has good imaging quality.

[0142] Example 5

[0143] Fig. 9 This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 5 of the present application. Specifically, taking the focal length F=0.9512mm of the optical lens 100, the aperture number FNO=1.63 of the optical lens 100, and the maximum field angle FOV=202deg of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 9. The definition of each parameter can be derived from the description of the aforementioned embodiments and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the refractive power of each lens, please refer to the aforementioned Example 4, which will not be repeated here. Regarding the refractive power of each lens, please refer to the aforementioned Example 4, which will not be repeated here.

[0144] Table 9

[0145]

[0146]

[0147] Table 10 gives the high-order coefficients of the aspheric surfaces of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 that can be used in Example 5, wherein the surface shape of each aspheric surface can be defined by the formula given in Example 1.

[0148] Table 10

[0149]

[0150] See also Fig.10 ,Depend on Fig.10 It can be seen from the spherical aberration diagram (A), the light astigmatism diagram (B), and the distortion diagram (C) in FIG. 1 that the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Fig.10 (A) Fig.10 (B) and Fig.10 The wavelengths corresponding to the curves in (C) can be referred to in Example 4. Figure 8 (A) Figure 8 (B) Figure 8 The contents described in (C) will not be repeated here.

[0151] Please refer to Table 11, which is a summary of the ratios of the various relationship equations in Examples 1 to 5 of the present application.

[0152] Table 11

[0153]

[0154]

[0155] See also Fig.11 The present application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any one of the embodiments 1 to 5 above, and the image sensor 201 is arranged on the image side of the optical lens 100. Specifically, the photosensitive surface of the image sensor 201 is located on the imaging surface 101 of the optical lens 100, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of the image. The image sensor 201 can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 200 can be an imaging module integrated on the terminal device 300, or it can be an independent lens. It can be understood that the camera module 200 with the above optical lens 100 has all the technical effects of the above optical lens 100, that is, the camera module 200 can achieve wide angle while also having good imaging quality in a weak light environment. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be described again here.

[0156] The present application also discloses a terminal device 300, which includes a housing 301 and the camera module 200, wherein the camera module 200 is disposed in the housing 301. The terminal device 300 may include but is not limited to a mobile phone, a tablet computer, a laptop computer, a smart watch, a vehicle-mounted device, a drone, a monitor, etc. Fig.12 Taking the terminal device 300 as a vehicle as an example, the shell 301 can be a vehicle body, and the camera module 200 can be set on the vehicle body, for example, inside the vehicle body or outside the vehicle body.

[0157] It can be understood that the terminal device 300 having the above-mentioned camera module 200 also has all the technical effects of the above-mentioned optical lens 100. That is, the terminal device 300 can achieve wide-angle imaging while also having good imaging quality in a weak light environment. Since the above-mentioned technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0158] The optical lens, camera module and terminal device disclosed in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the optical lens, camera module and terminal device of the present application and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical lens, characterized in that: There are a total of six lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis; The first lens has negative refractive power. The object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; The second lens has negative refractive power. The object side surface of the second lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; The third lens has positive refractive power. Both the object side surface and the image side surface of the third lens are convex near the optical axis; The fourth lens has refractive power. Both the object side surface and the image side surface of the fourth lens are convex near the optical axis; The fifth lens has negative refractive power. Both the object side surface and the image side surface of the fifth lens are concave near the optical axis; The sixth lens has positive refractive power. Both the object side surface and the image side surface of the sixth lens are convex near the optical axis; The optical lens satisfies the following relational expressions: 195deg < FOV < 215deg, FNO < 1.7; Wherein, FOV is the maximum field of view angle of the optical lens, and FNO is the f-number of the optical lens.

2. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 1.9 < IMGH / F < 2.2, and / or, 6 < TTL / IMGH < 7, and / or, 13.5 < TTL / F < 14; Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, F is the focal length of the optical lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens.

3. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: |F45 / F| > 5, and / or, 1.4 < F3 / F6 < 1.9, and / or, -5.3 < F1 / F < -4.5; Wherein, F is the focal length of the optical lens, F45 is the combined focal length of the fourth lens and the fifth lens, F1 is the focal length of the first lens, F3 is the focal length of the third lens, and F6 is the focal length of the sixth lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 2.3 < SD1 / IMGH < 2.9, and / or, |SAGS4 / SAGS3| > 3, and / or, 1.1 < SD4 / IMGH < 1.35; Wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, SAGS3 is the distance on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the maximum effective aperture of the object side surface of the second lens, SAGS4 is the distance on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the maximum effective aperture of the image side surface of the second lens, and SD4 is half of the maximum effective aperture of the image side surface of the second lens.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 2 < CT4 / CT5 < 2.5, and / or, 1 < CT12 / (CT1 + CT2) < 1.2, and / or, 1.45 < ET1 / CT1 < 1.8; Wherein, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and ET1 is the distance in the optical axis direction from the maximum effective aperture of the object side of the first lens to the maximum effective aperture of the image side of the first lens.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 3 < R1 / R2 < 5, and / or, 4 < R3 / R4 < 7, and / or, -2.5 < R6 / R7 < -1; Wherein, R1 is the curvature radius of the object side of the first lens on the optical axis, R2 is the curvature radius of the image side of the first lens on the optical axis, R3 is the curvature radius of the object side of the second lens on the optical axis, R4 is the curvature radius of the image side of the second lens on the optical axis, R6 is the curvature radius of the image side of the third lens on the optical axis, and R7 is the curvature radius of the object side 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 relational expressions: -6 < F1 / CT1 < -4, and / or, 0.7 < SAGS1 / ET1 < 1.05; Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, SAGS1 is the distance on the optical axis from the intersection point of the object side of the first lens and the optical axis to the maximum effective aperture of the object side of the first lens, and ET1 is the distance in the optical axis direction from the maximum effective aperture of the object side of the first lens to the maximum effective aperture of the image side of the first lens.

8. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relational expressions: 28deg < FOV*IMGH / TTL < 35deg, and / or, 14deg < FOV*F / TTL < 16deg; Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, and F is the focal length of the optical lens.

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

10. A terminal device, characterized in that: The terminal device includes a housing and the imaging module according to claim 9, and the imaging module is disposed in the housing.

Images