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 seven lenses with refractive power. The first lens has negative refractive power, and the object side surface and the image side surface of the first lens are convex and concave respectively. The second lens has negative refractive power, and the image side surface of the second lens is concave. The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are concave and convex respectively. The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are both convex. The fifth lens has negative refractive power, and the image side surface of the fifth lens is concave. The sixth lens has positive refractive power, and the object side surface and the image side surface of the sixth lens are both convex. The seventh lens has positive refractive power, and the object side surface of the seventh lens is convex. The optical lens satisfies the relationship: 11 < TTL / F < 14, and FOV is greater than or equal to 200 degrees. The optical lens, the camera module and the terminal device can have high imaging quality and meet 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 continuous iteration of the technology of the automobile industry, intelligent auxiliary driving systems have also developed rapidly, and higher requirements have been put forward for the imaging technology of vehicle-mounted lenses. While optical lenses are gradually tending to be light, thin and small, the characteristics of high pixels and large field of view have also become market demands.

[0003] However, in the trend of miniaturization design of the optical lenses on the market at present, the field of view is small and the pixels are low, which is not conducive to the high imaging quality of the optical lens. SUMMARY

[0004] The embodiments of the present application disclose an optical lens, a camera module and a terminal device, which can meet the design requirements of miniaturization while having high imaging quality.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical lens, which has seven lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh 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 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.

[0007] The second lens has negative refractive power, and the image side surface of the second lens is concave at the near optical axis.

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

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

[0010] The fifth lens has negative refractive power, and the image side surface of the fifth lens is concave at the near optical axis.

[0011] The sixth lens has positive refractive power, and the object side surface and the image side surface of the sixth lens are both convex at the near optical axis.

[0012] The seventh lens has positive refractive power, and the object side surface of the seventh lens is convex at the near optical axis.

[0013] The optical lens satisfies the following relationship:

[0014] 11<TTL / F<14, FOV≥200 deg;

[0015] Wherein, 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), F is the focal length of the optical lens, and FOV is the maximum field of view angle of the optical lens.

[0016] In the optical lens provided by the present application, in order to meet the design requirements of small size while having high imaging quality, the refractive power and surface shape of the seven lenses are reasonably configured, i.e. the first lens is set to have negative refractive power, and the object side surface and the image side surface thereof are respectively designed as convex and concave surfaces near the optical axis, which is beneficial to couple more light into the optical lens, effectively increase the field of view angle, improve the relative luminance of the edge field of view of the optical lens, and effectively avoid the occurrence of dark corners; the second lens has negative refractive power, and the image side surface thereof is designed as a concave surface near the optical axis, which makes the light passing through the first lens further coupled into the optical lens, and cooperates with the first lens to well control the aperture of the optical lens, so that the optical lens is more miniaturized; the third lens has positive refractive power, and the object side surface and the image side surface thereof are respectively designed as concave and convex surfaces near the optical axis, which can move the refractive power of the overall optical lens to the object side direction, is beneficial to slow down the light entering the optical lens, makes the light more gentle, and improves the yield; the fourth lens has positive refractive power, and the object side surface and the image side surface thereof are both designed as convex surfaces near the optical axis, which can effectively compensate for the defocus of other lenses in the optical lens in high-temperature or low-temperature environment, thereby ensuring the imaging quality of the entire optical lens in high-temperature or low-temperature environment; the fifth lens has negative refractive power, and the image side surface thereof is designed as a concave surface near the optical axis, the sixth lens has positive refractive power, and the object side surface and the image side surface thereof are both designed as convex surfaces near the optical axis, which can effectively eliminate chromatic aberration, improve the imaging quality of the optical lens, and also can reasonably distribute the refractive power of the fifth lens and the sixth lens; the seventh lens has positive refractive power, and the object side surface thereof is designed as a convex surface near the optical axis, which can correct the off-axis spherical aberration and dispersion of the optical lens, thereby improving the optical imaging quality.

[0017] By limiting the optical lens to satisfy the relationship 11 < TTL / F < 14, the focal length of the optical lens and the total length of the optical lens can be reasonably controlled, not only the miniaturization of the optical lens can be realized, but also the light can be better converged on the imaging surface, thereby the imaging quality of the optical lens is improved. When the optical lens is below the lower limit of the above relationship, the total length of the optical lens is too short relative to the focal length of the optical lens, which easily increases the sensitivity of the optical lens, and is not conducive to the convergence of light on the imaging surface; when the optical lens exceeds the upper limit of the above relationship, the total length of the optical lens is too long relative to the focal length of the optical lens, which leads to the angle of the chief ray of light entering the imaging surface being too large, the edge light of the optical lens cannot be imaged on the imaging surface, resulting in incomplete imaging information and reducing the imaging quality, and is not conducive to the miniaturization design of the optical lens. By limiting the optical lens to satisfy the relationship FOV ≥ 200 deg, the optical lens can be provided with sufficient field of view to meet the wide-angle characteristics of the optical lens.

[0018] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0019] 120 deg < FOV / FNO < 135 deg, and / or, 3.5 < H / F < 4.2, and / or, 7 < TTL / BFL < 8.1;

[0020] Wherein, FNO is the aperture number of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and BFL is the distance from the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis (i.e. back focal length).

[0021] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0022] 2 < (CT5+CT6+CT7) / F < 3, and / or, |F56 / F| > 5, and / or, 2 < F567 / F1234 < 7;

[0023] Wherein, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, F56 is the combined focal length of the fifth lens and the sixth lens, F567 is the combined focal length of the fifth lens, the sixth lens and the seventh lens, and F1234 is the combined focal length of the first lens, the second lens, the third lens and the fourth 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] 2 < F4 / CT4 < 4, and / or, -4.5 < F5 / CT5 < -3, and / or, 4 < (F4-F5) / F < 6;

[0026] wherein F4 is a focal length of the fourth lens, CT4 is a thickness of the fourth lens on the optical axis, F5 is a focal length of the fifth lens, and CT5 is a thickness of the fifth lens on the optical axis.

[0027] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0028] 0.9 < CT45 / CT34 < 11, and / or, 1 < SD6 / SD7 < 1.3;

[0029] wherein CT34 is a distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis (i.e. the air gap between the third lens and the fourth lens), CT45 is a distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis (i.e. the air gap between the fourth lens and the fifth lens), SD6 is a maximum effective half aperture of the image side surface of the third lens, and SD7 is a maximum effective half aperture of the object side surface of the fourth lens.

[0030] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0031] 3 < R1*ND1 / SD1 < 4, and / or, 3.4 < SD1 / SAG1 < 3.9, and / or, 1.1 < SD1 / H < 1.4;

[0032] wherein R1 is a curvature radius of the object side surface of the first lens at the optical axis, ND1 is a refractive index of the first lens, SD1 is a maximum effective half aperture of the object side surface of the first lens, SAG1 is a distance between the intersection of the object side surface of the first lens and the optical axis and the maximum effective aperture of the object side surface of the first lens on the optical axis (i.e. the sag of the maximum effective aperture of the object side surface of the first lens), and H is an image height corresponding to the maximum field angle 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] |SAG14 / SAG13| < 30, and / or, 1.6 < CT7 / ET7 < 2.1, and / or, 4 < F7 / F < 12;

[0035] SAG13 is a distance from an intersection of an object side surface of the seventh lens and an optical axis to a maximum effective aperture of the object side surface of the seventh lens on the optical axis (i.e., a sag of the maximum effective aperture of the object side surface of the seventh lens), SAG14 is a distance from an intersection of an image side surface of the seventh lens and the optical axis to a maximum effective aperture of the image side surface of the seventh lens on the optical axis (i.e., a sag of the maximum effective aperture of the image side surface of the seventh lens), CT7 is a thickness of the seventh lens on the optical axis, ET7 is a distance from a maximum effective half aperture of the object side surface of the seventh lens to a maximum effective half aperture of the image side surface of the seventh lens in a direction parallel to the optical axis (i.e., an edge thickness of the seventh lens), and F7 is a focal length of the seventh lens.

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

[0037] -1.5 < R7 / R8 / ND4 < -0.5, and / or, -10 < R12 / R11 < -2, and / or, |R14 / R13| < 10;

[0038] R7 is a curvature radius of the object side surface of the fourth lens at the optical axis, R8 is a curvature radius of the image side surface of the fourth lens at the optical axis, ND4 is a refractive index of the fourth lens, R11 is a curvature radius of the object side surface of the sixth lens at the optical axis, R12 is a curvature radius of the image side surface of the sixth lens at the optical axis, R13 is a curvature radius of the object side surface of the seventh lens at the optical axis, and R14 is a curvature radius of the image side surface of the seventh lens at the optical axis.

[0039] In a second aspect, the present application discloses a camera module, comprising an image sensor and the optical lens according to the first aspect.

[0040] In a third aspect, the present application discloses a terminal device, comprising a housing and the camera module according to the second aspect.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] The optical lens provided in the application can have high imaging quality and meet the design requirement of miniaturization. The refractive power and surface shape of the seven lenses are reasonably configured. The first lens is arranged to have negative refractive power, and the object side surface and the image side surface thereof are respectively arranged as a convex surface and a concave surface near the optical axis. This is beneficial to coupling more light into the optical lens, effectively increasing the field of view and improving the relative luminance of the edge field of view of the optical lens, and effectively avoiding the occurrence of dark corners. The second lens has negative refractive power, and the image side surface thereof is arranged as a concave surface near the optical axis. This makes the light passing through the first lens further coupled into the optical lens, and cooperates with the first lens to well control the aperture of the optical lens, so that the optical lens is more miniaturized. The third lens has positive refractive power, and the object side surface and the image side surface thereof are respectively arranged as a concave surface and a convex surface near the optical axis. This can move the refractive power of the overall optical lens to the object side, which is beneficial to slow down the light entering the optical lens, so that the light is more gentle, and the yield is improved. The fourth lens has positive refractive power, and the object side surface and the image side surface thereof are both arranged as a convex surface near the optical axis. This can effectively compensate for the defocus of other lenses in the optical lens in a high-temperature or low-temperature environment, thereby ensuring the imaging quality of the entire optical lens in a high-temperature or low-temperature environment. The fifth lens has negative refractive power, and the image side surface thereof is arranged as a concave surface near the optical axis. The sixth lens has positive refractive power, and the object side surface and the image side surface thereof are both arranged as a convex surface near the optical axis. This can effectively eliminate chromatic aberration, improve the imaging quality of the optical lens, and also reasonably distribute the refractive power of the fifth lens and the sixth lens. The seventh lens has positive refractive power, and the object side surface thereof is arranged as a convex surface near the optical axis. This can correct the off-axis spherical aberration and dispersion of the optical lens, thereby improving the optical imaging quality.

[0043] By limiting the optical lens to satisfy the relationship 11 < TTL / F < 14, the focal length of the optical lens and the total length of the optical lens can be reasonably controlled. Not only can the miniaturization of the optical lens be realized, but also the light can be better converged on the imaging surface, thereby improving the imaging quality of the optical lens. When the optical lens is below the lower limit of the above relationship, the total length of the optical lens is too short relative to the focal length of the optical lens, which easily increases the sensitivity of the optical lens, and is not conducive to the convergence of light on the imaging surface. When the optical lens exceeds the upper limit of the above relationship, the total length of the optical lens is too long relative to the focal length of the optical lens, which causes the angle of the chief ray entering the imaging surface to be too large, the edge light of the optical lens cannot be imaged on the imaging surface, resulting in incomplete imaging information and reducing the imaging quality, and is not conducive to the miniaturization design of the optical lens. By limiting the optical lens to satisfy the relationship FOV ≥ 200 deg, the optical lens can be provided with sufficient field of view to meet the wide-angle characteristics of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0044] 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 as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 is a structural schematic diagram of an optical lens disclosed by a first embodiment of the present application;

[0046] Figure 2 is a spherical aberration diagram (mm), a coma diagram (mm) and a distortion diagram (%) of the optical lens disclosed by the first embodiment of the present application;

[0047] Figure 3 is a structural schematic diagram of an optical lens disclosed by a second embodiment of the present application;

[0048] Figure 4 is a spherical aberration diagram (mm), a coma diagram (mm) and a distortion diagram (%) of the optical lens disclosed by the second embodiment of the present application;

[0049] Figure 5 is a structural schematic diagram of an optical lens disclosed by a third embodiment of the present application;

[0050] Figure 6 is a spherical aberration diagram (mm), a coma diagram (mm) and a distortion diagram (%) of the optical lens disclosed by the third embodiment of the present application;

[0051] Figure 7 is a structural schematic diagram of an optical lens disclosed by a fourth embodiment of the present application;

[0052] Figure 8 is a spherical aberration diagram (mm), a coma diagram (mm) and a distortion diagram (%) of the optical lens disclosed by the fourth embodiment of the present application;

[0053] Figure 9 is a structural schematic diagram of an optical lens disclosed by a fifth embodiment of the present application;

[0054] Figure 10 is a spherical aberration diagram (mm), a coma diagram (mm) and a distortion diagram (%) of the optical lens disclosed by the fifth embodiment of the present application;

[0055] Figure 11 is a structural schematic diagram of a camera module disclosed by the present application;

[0056] Figure 12 is a structural schematic diagram of a terminal device as a mobile phone disclosed by the present application;

[0057] Figure 13 is a structural schematic diagram of a terminal device as a car disclosed by the present application. DETAILED DESCRIPTION

[0058] 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 the other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0059] In the present application, the positions or location relations indicated by the terms “inner”, “outer” and the like are based on the positions or location relations shown in the drawings. These terms are mainly used for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific position, or to be constructed and operated in a specific position.

[0060] In addition, in addition to indicating the positions or location relations, the above-mentioned 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. A person of ordinary skill in the art can understand the specific meanings of these terms in the present application according to the specific circumstances.

[0061] In addition, the terms “provided with” and “provided” should be understood broadly. 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 it can be the internal communication between two devices, elements or components. A person of ordinary skill in the art can understand the specific meanings of the above-mentioned terms in the present application according to the specific circumstances.

[0062] In addition, the terms “first”, “second” and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can 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, the meaning of “multiple” is two or more.

[0063] The technical solutions of the present application will be further described below with reference to the embodiments and the drawings.

[0064] Please refer to Figure 1The optical lens 100 disclosed by the application 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 and a seventh lens L7 arranged in sequence along an optical axis from an object side to an image side. 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, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, and the seventh lens L7 has positive refractive power. When imaging, 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 and the seventh lens L7 in sequence from the object side of the first lens L1, and finally image on the imaging surface 101 of the optical lens 100.

[0065] Further, the object side surface 11 of the first lens L1 is convex at the near optical axis, 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 or concave at the near optical axis, the image side surface 22 of the second lens L2 is concave at the near optical axis, the object side surface 31 of the third lens L3 is concave at the near optical axis, the image side surface 32 of the third lens L3 is convex at the near optical axis, the object side surface 41 of the fourth lens L4 is convex at the near optical axis, the image side surface 42 of the fourth lens L4 is convex at the near optical axis, the object side surface 51 of the fifth lens L5 is convex or concave at the near optical axis, the image side surface 52 of the fifth lens L5 is concave at the near optical axis, the object side surface 61 of the sixth lens L6 is convex at the near optical axis, the image side surface 62 of the sixth lens L6 is convex at the near optical axis, the object side surface 71 of the seventh lens L7 is convex at the near optical axis, and the image side surface 72 of the seventh lens L7 is convex or concave at the near optical axis.

[0066] In the optical lens 100 provided in the application, in order to meet the design requirements of miniaturization while having high imaging quality, the refractive power and surface shape of the seven lenses are reasonably configured, that is, the first lens L1 is set to have negative refractive power, and the object side surface and the image side surface thereof are respectively designed as a convex surface and a concave surface at the near optical axis, which is beneficial to couple more light into the optical lens 100, effectively increase the field of view, improve the relative luminance of the edge field of view of the optical lens 100, and effectively avoid the occurrence of dark corners; the second lens L2 has negative refractive power, and the image side surface thereof is designed as a concave surface at the near optical axis, which makes the light passing through the first lens further coupled into the optical lens 100, and cooperates with the first lens L1 to well control the aperture of the optical lens 100, so that the optical lens 100 is more miniaturized; the third lens L3 has positive refractive power, and the object side surface and the image side surface thereof are respectively designed as a concave surface and a convex surface at the near optical axis, which can move the refractive power of the overall optical lens 100 to the object side, is beneficial to slow down the light entering the optical lens 100, makes the light more gentle, and improves the yield; the fourth lens L4 has positive refractive power, and the object side surface and the image side surface thereof are both designed as a convex surface at the near optical axis, which can effectively compensate for the defocus of other lenses in the optical lens 100 in a high-temperature or low-temperature environment, thereby ensuring the imaging quality of the entire optical lens 100 in a high-temperature or low-temperature environment; the fifth lens L5 has negative refractive power, and the image side surface thereof is designed as a concave surface at the near optical axis, the sixth lens L6 has positive refractive power, and the object side surface and the image side surface thereof are both designed as a convex surface at the near optical axis, which can effectively eliminate chromatic aberration, improve the imaging quality of the optical lens 100, and also reasonably distribute the refractive power of the fifth lens L5 and the sixth lens L6; the seventh lens L7 has positive refractive power, and the object side surface thereof is designed as a convex surface at the near optical axis, which can correct the off-axis spherical aberration and dispersion of the optical lens 100, thereby improving the optical imaging quality.

[0067] Optionally, in the above seven lenses, all can be plastic lenses, so that the overall optical lens 100 is relatively light and convenient for processing of complex surface shapes. Alternatively, in the above seven lenses, all can be glass lenses, or some lenses can be plastic lenses and some lenses can be glass lenses.

[0068] Preferably, the materials of the first lens L1 and the fourth lens L4 can be glass, and the materials of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be plastic. By adopting the lens glass-plastic hybrid architecture, the advantages of plastic lenses and glass lenses can be combined, so that the optical lens 100 has good optical effect, reduces the temperature sensitivity of the optical lens 100, reduces the overall weight of the optical lens 100, and reduces the production cost of the optical lens 100.

[0069] Optionally, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be aspherical lenses, and the first lens L1 and the fourth lens L4 can be spherical lenses. The combination of spherical lenses and aspherical lenses can improve high-order aberrations, thereby improving the imaging quality of the optical lens 100.

[0070] In some embodiments, the optical lens 100 further comprises a diaphragm 102, which can be an aperture diaphragm and / or a field diaphragm, and which can be arranged between the image side 42 of the fourth lens L4 and the object side 51 of the fifth lens L5 of the optical lens 100. It can be understood that in other embodiments, the diaphragm 102 can also be arranged between other lenses, and the arrangement can be adjusted according to actual conditions, and the present embodiment is not limited in particular.

[0071] In some embodiments, the optical lens 100 further comprises a filter 110, which can be arranged between the image side 72 of the seventh lens L7 and the imaging surface 101 of the optical lens 100. In the present embodiment, the filter 110 can be 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 110 can also be 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. By filtering out light of other wavebands such as visible light, the imaging quality is improved, and the optical lens 100 can be used as an infrared optical lens 100, i.e., the optical lens 100 can image and obtain a better image effect in a dim environment and other special application scenarios. Preferably, the filter 110 can be made of glass, and of course in other embodiments, the filter 110 can also be made of optical glass coating or other materials, and can be selected according to actual needs, and the present embodiment is not limited in particular.

[0072] In some embodiments, the optical lens 100 further comprises a protective glass 120, which is arranged between the filter 110 and the imaging surface 101, so as to be close to the image sensor during subsequent assembly, thereby playing a protective role.

[0073] In some embodiments, the optical lens 100 satisfies a relationship 11 < TTL / F < 14, TTL is a distance from the object side 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis, and F is a focal length of the optical lens 100. By reasonably controlling the focal length of the optical lens 100 and the total length of the optical lens 100, not only the miniaturization of the optical lens 100 can be realized, but also the light can be better converged on the imaging surface 101, thereby improving the imaging quality of the optical lens 100. When the optical lens 100 is below the lower limit of the above relationship, the total length of the optical lens 100 is too short relative to the focal length of the optical lens 100, which easily increases the sensitivity of the optical lens 100, and is not conducive to the convergence of light on the imaging surface 101; when the optical lens 100 exceeds the upper limit of the above relationship, the total length of the optical lens 100 is too long relative to the focal length of the optical lens 100, which causes the angle of the chief ray of light entering the imaging surface 101 to be too large, the edge light of the optical lens 100 cannot be imaged on the imaging surface 101, resulting in incomplete imaging information and reducing the imaging quality, and is not conducive to the miniaturization design of the optical lens 100.

[0074] In some embodiments, the optical lens 100 satisfies a relationship FOV ≥ 200 deg, FOV is a maximum field of view angle of the optical lens 100, which can provide sufficient field of view angle for the optical lens 100 to satisfy the wide-angle characteristic of the optical lens 100. More preferably, the optical lens 100 satisfies a relationship 200 deg ≤ FOV ≤ 210 deg.

[0075] In some embodiments, the optical lens 100 satisfies a relationship 1.5 < FNO < 1.7, FNO is an aperture number of the optical lens 100, and the optical lens 100 has a large aperture characteristic, which can improve the light amount of the optical lens 100, so that the optical lens 100 can also be applied to night or low ambient brightness scenes.

[0076] In some embodiments, the optical lens 100 satisfies a relationship 120 deg < FOV / FNO < 135 deg, FOV is a maximum field of view angle of the optical lens 100, and FNO is an aperture number of the optical lens 100. By controlling the relationship between the maximum field of view angle and the aperture number of the optical lens 100, a reasonable field of view angle and aperture number are provided for the optical lens 100, which can balance the design difficulty and the demand for field of view angle, and at the same time, the aperture changes within a reasonable range, providing a combination effect of wide field of view and large aperture, which can satisfy low-temperature or high-temperature environments, keep the picture clear, and be more conducive to improving the imaging quality.

[0077] In some embodiments, the optical lens 100 satisfies a relationship 3.5 < H / F < 4.2, H is an image height corresponding to a maximum field angle of the optical lens 100, and F is a focal length of the optical lens 100. By controlling the ratio of the image height corresponding to the maximum field angle of the optical lens 100 to the focal length of the optical lens 100, the light can be gently incident on the imaging surface 101 of the optical lens 100, thereby achieving the effect of increasing the image height.

[0078] In some embodiments, the optical lens 100 satisfies a relationship 7 < TTL / BFL < 8.1, TTL is a total length of the optical lens 100, and BFL is a distance from the image side surface 72 of the seventh lens L7 to the imaging surface 101 of the optical lens 100 on the optical axis. By limiting the ratio of the total length of the optical lens 100 to the back focal length, the total length of the optical lens 100 can be reasonably controlled to achieve miniaturization design. When the optical lens 100 exceeds the upper limit of the above relationship, the total length of the optical lens 100 is too long, which is not conducive to miniaturization. When the optical lens 100 is lower than the lower limit of the above relationship, the back focal length of the optical lens 100 is too long, which is not conducive to the large image surface effect of the optical lens 100.

[0079] In some embodiments, the optical lens 100 satisfies a relationship 2 < (CT5+CT6+CT7) / F < 3, CT5 is a thickness of the fifth lens L5 on the optical axis, CT6 is a thickness of the sixth lens L6 on the optical axis, CT7 is a thickness of the seventh lens L7 on the optical axis, and F is a focal length of the optical lens 100. In this range, the thicknesses of the lenses of the optical lens 100 can be reasonably controlled, and sufficient space is left for the back focal length of the optical lens 100 to minimize the light halo generated between the optical filter 110 and the image processor, thereby ensuring the imaging quality of the optical lens 100.

[0080] In some embodiments, the optical lens 100 satisfies a relationship |F56 / F| > 5, F56 is a combined focal length of the fifth lens L5 and the sixth lens L6, and F is a focal length of the optical lens 100. By controlling the relationship between the combined focal length of the fifth lens L5 and the sixth lens L6 and the focal length of the optical lens 100, the aberration can be corrected, and the imaging quality of the optical lens 100 can be improved. When the optical lens 100 is lower than the lower limit of the above relationship, the combined focal length of the fifth lens L5 and the sixth lens L6 is too large, the refractive power generated by the two is too weak, and large edge aberration and chromatic aberration are prone to occur, which is not conducive to improving the resolution performance of the optical lens 100. More preferably, the optical lens 100 satisfies a relationship 6 < |F56 / F| < 35.

[0081] In some embodiments, the optical lens 100 satisfies a relationship 2 < F567 / F1234 < 7, F567 is a combined focal length of the fifth lens L5, the sixth lens L6 and the seventh lens L7, F1234 is a combined focal length of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4, which is beneficial to reasonably distribute the refractive power of the front lens group and the rear lens group, thereby being beneficial to the aberration balance of the front lens group and the rear lens group, and realizing the effect of a large aperture and a large target surface of the optical lens 100.

[0082] In some embodiments, the optical lens 100 satisfies a relationship 4 < (F4-F5) / F < 6, F4 is a focal length of the fourth lens L4, F5 is a focal length of the fifth lens L5, and F is a focal length of the optical lens 100, which ensures that the focal length of the fourth lens L4, the focal length of the fifth lens L5 and the focal length of the optical lens 100 satisfy the above relationship, and in the case of satisfying the depth of field of the optical lens 100, the focal length of each lens can be effectively distributed, and the optical lens 100 has good imaging quality in both high-temperature and low-temperature environments.

[0083] In some embodiments, the optical lens 100 satisfies a relationship 0.9 < CT45 / CT34 < 11, CT34 is a distance on the optical axis from the image side surface of the third lens L3 to the object side surface of the fourth lens L4, and CT45 is a distance on the optical axis from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5, and by controlling the relationship between the air gap between the fourth lens L4 and the fifth lens L5 and the air gap between the third lens L3 and the fourth lens L4, the air gap between the fourth lens L4 and the fifth lens L5 can be reasonably controlled, and sufficient space is left for the setting of the diaphragm, thereby being beneficial to the arrangement of the optical lens 100.

[0084] In some embodiments, the optical lens 100 satisfies a relationship 1 < SD6 / SD7 < 1.3, SD6 is the maximum effective half aperture of the image side surface 32 of the third lens L3, and SD7 is the maximum effective half aperture of the object side surface 41 of the fourth lens L4, so that the fourth lens L4 has the characteristic of a small aperture, and the light rays of the third lens L3 can be effectively collected, so that the light rays enter the imaging surface 101 of the optical lens 100 better.

[0085] In some embodiments, the optical lens 100 satisfies a relationship 3 < R1*ND1 / SD1 < 4, R1 is the radius of curvature of the object side surface 11 of the first lens L1 at the optical axis, ND1 is the refractive index of the first lens L1, and SD1 is the maximum effective half aperture of the object side surface 11 of the first lens L1. Satisfying the above relationship can effectively control the aperture of the optical lens 100 within a reasonable range, and ensure the illumination of the optical lens 100, and reduce the risk of dark corners of the optical lens 100.

[0086] In some embodiments, the optical lens 100 satisfies a relationship 3.4 < SD1 / SAG1 < 3.9, SD1 is the maximum effective half aperture of the object side 11 of the first lens L1, and SAG1 is the distance from the intersection of the object side 11 of the first lens L1 and the optical axis to the maximum effective aperture of the object side 11 of the first lens L1 on the optical axis. By controlling the ratio of the maximum effective half aperture of the object side 11 of the first lens L1 to the sag of the object side 11, the size of the maximum effective half aperture of the object side 11 of the first lens L1 can be effectively controlled, and by further controlling the sag of the object side 11 of the first lens L1, the overall volume of the first lens L1 can be more effectively compressed, and the ghost risk can be reduced. When the optical lens 100 exceeds the upper limit of the above relationship, it is not conducive to reducing the maximum effective half aperture of the object side 11 of the first lens L1, which affects the smooth incidence of light on the second lens L2 and increases the ghost risk. When the optical lens 100 is lower than the lower limit of the above relationship, the sag of the object side 11 of the first lens L1 is too large, and the surface shape of the first lens L1 is too curved, which is not conducive to the processing and design of the first lens L1.

[0087] In some embodiments, the optical lens 100 satisfies a relationship 1.1 < SD1 / H < 1.4, SD1 is the maximum effective half aperture of the object side 11 of the first lens L1, and H is the image height corresponding to the maximum field of view angle of the optical lens 100. The image height of the optical lens 100 can be effectively controlled to meet the requirements of high pixels and good image quality of the optical lens 100.

[0088] In some embodiments, the optical lens 100 satisfies a relationship |SAG14 / SAG13| < 30, SAG13 is the distance from the intersection of the object side 71 of the seventh lens L7 and the optical axis to the maximum effective aperture of the object side 71 of the seventh lens L7 on the optical axis, and SAG14 is the distance from the intersection of the image side of the seventh lens L7 and the optical axis to the maximum effective aperture of the image side 72 of the seventh lens L7 on the optical axis. Satisfying the above relationship can effectively control the shape of the seventh lens L7, thereby facilitating the molding and processing of the seventh lens L7. At the same time, the field curvature generated by each lens on the object side can be adjusted to ensure the balance of the field curvature of the optical lens 100.

[0089] In some embodiments, the optical lens 100 satisfies a relationship 1.6 < CT7 / ET7 < 2.1, CT7 is the thickness of the seventh lens L7 on the optical axis, and ET7 is the distance from the maximum effective half aperture of the object side 71 of the seventh lens L7 to the maximum effective half aperture of the image side 72 of the seventh lens L7 in the direction parallel to the optical axis. By controlling the ratio of the thickness of the seventh lens L7 on the optical axis to the edge thickness, the high-order aberration generated by the optical lens 100 can be effectively balanced, and the field curvature of the seventh lens L7 can be adjusted, thereby improving the imaging quality of the optical lens 100.

[0090] In some embodiments, the optical lens 100 satisfies the relationship 4 < F7 / F < 12, F7 is the focal length of the seventh lens L7, F is the focal length of the optical lens 100, the seventh lens L7 provides positive refractive power for the entire optical lens 100 and provides the main light converging capability, by controlling the ratio of the focal length of the seventh lens L7 to the focal length of the optical lens 100, it is beneficial to reasonably distribute the positive refractive power of the optical lens 100, shorten the total length of the optical lens 100, and is beneficial to realize the miniaturization of the optical lens 100. When the optical lens 100 exceeds the upper limit of the above relationship, the focal length of the seventh lens L7 becomes larger, the light converging capability becomes worse, which leads to large light deflection and easily increases the aberration of the off-axis field of view; when the optical lens 100 is lower than the lower limit of the above relationship, the focal length of the optical lens 100 is too large, which leads to the total length of the optical lens 100 being too long, which is not conducive to the miniaturization of the optical lens 100.

[0091] In some embodiments, the optical lens 100 satisfies the relationship -1.5 < R7 / R8 / ND4 < -0.5, R7 is the curvature radius of the object side surface 41 of the fourth lens L4 at the optical axis, R8 is the curvature radius of the image side surface 42 of the fourth lens L4 at the optical axis, and ND4 is the refractive index of the fourth lens L4. The fourth lens L4 is located at the turning position of the light path, and the machinability and sensitivity are poor. By ensuring that the parameters of the fourth lens L4 satisfy the above conditions, the machinability and assembly feasibility of the fourth lens L4 can be effectively ensured, and the sensitivity of the lens can be effectively reduced, and the yield of the optical lens 100 is improved.

[0092] In some embodiments, the optical lens 100 satisfies the relationship -10 < R12 / R11 < -2, R11 is the curvature radius of the object side surface 61 of the sixth lens L6 at the optical axis, and R12 is the curvature radius of the image side surface 62 of the sixth lens L6 at the optical axis. By controlling the curvature radius ratio of the image side surface 62 and the object side surface 61 of the sixth lens L6, the surface type of the sixth lens L6 can be controlled, which is beneficial to make the light exit gently, and is also beneficial to cooperate with the fifth lens L5, and the two constitute a cemented lens.

[0093] In some embodiments, the optical lens 100 satisfies the relationship |R14 / R13| < 10, R13 is the curvature radius of the object side surface 71 of the seventh lens L7 at the optical axis, and R14 is the curvature radius of the image side surface 72 of the seventh lens L7 at the optical axis. By controlling the curvature radius ratio of the image side surface 72 and the object side surface 71 of the seventh lens L7, the main light angle of the optical lens 100 can be effectively ensured to be within a reasonable range, and the risk of color deviation of the optical lens 100 is avoided.

[0094] In some embodiments, the optical lens 100 satisfies the relationship |R1 / R3 / R11| < 2mm -1R1 is the curvature radius of the object side surface 11 of the first lens L1 at the optical axis, R3 is the curvature radius of the object side surface 21 of the second lens L2 at the optical axis, R11 is the curvature radius of the object side surface 61 of the sixth lens L6 at the optical axis, by controlling the curvature radius among the object side surface 21 of the first lens L1, the object side surface 21 of the second lens L2 and the object side surface 61 of the sixth lens L6 within the above range, the ghost image entanglement generated between them and the image plane can be avoided, thereby facilitating to improve the imaging quality.

[0095] In some embodiments, the optical lens 100 satisfies the relationship |R9 / R11 / R12|<10mm -1 R9 is the curvature radius of the object side surface 51 of the fifth lens L5 at the optical axis, R11 is the curvature radius of the object side surface 61 of the sixth lens L6 at the optical axis, R12 is the curvature radius of the image side surface 62 of the sixth lens L6 at the optical axis, by controlling the curvature radius among the object side surface 51 of the fifth lens L5, the object side surface 61 of the sixth lens L6 and the image side surface 62 of the sixth lens L6 within the above range, the chromatic aberration of the optical lens 100 can be effectively controlled, and the overall performance of the optical lens 100 is improved.

[0096] In some embodiments, the optical lens 100 satisfies the relationship |R3*CT12 / R2|>1mm, R3 is the curvature radius of the object side surface 21 of the second lens L2 at the optical axis, R2 is the curvature radius of the image side surface 12 of the first lens L1 at the optical axis, and CT12 is the distance from the image side surface 12 of the first lens L1 to the object side surface 21 of the second lens L2 at the optical axis. Satisfying the above relationship can effectively ensure the processability of the image side surface 12 of the first lens L1 while facilitating to control the air gap between the first lens L1 and the second lens L2 to meet the assembly.

[0097] In some embodiments, the optical lens 100 satisfies the relationship 2

[0098] In some embodiments, the optical lens 100 satisfies the relationship |R3 / R4|>3, R3 is the curvature radius of the object side surface 21 of the second lens L2 at the optical axis, and R4 is the curvature radius of the image side surface 22 of the second lens L2 at the optical axis, so that the light can enter the second lens L2 and exit smoothly, reducing the eccentricity sensitivity of the lens.

[0099] In some embodiments, the optical lens 100 satisfies a relationship R5 / R6<2, R5 is a curvature radius of the object side 31 of the third lens L3 at the optical axis, R6 is a curvature radius of the image side 32 of the third lens L3 at the optical axis, by reasonably matching the curvature radius of the object side 31 and the image side 32 of the third lens L3 at the optical axis, the difference of the surface type of the third lens L3 is reasonably set, the light passing through the second lens L2 is gently incident on the third lens L3, and meanwhile, the sensitivity of the third lens L3 eccentricity is reduced, and the aberration is corrected.

[0100] In some embodiments, the optical lens 100 satisfies a relationship -2<R7 / R8<0, R7 is a curvature radius of the object side 41 of the fourth lens L4 at the optical axis, R8 is a curvature radius of the image side 42 of the fourth lens L4 at the optical axis, by controlling the ratio of the curvature radius of the object side 41 and the image side 42 of the fourth lens L4 at the optical axis, the shape of the fourth lens L4 is controlled, the aberration generated by itself is corrected, and the imaging quality is improved.

[0101] In some embodiments, the optical lens 100 satisfies a relationship |R9 / R10|>5, R9 is a curvature radius of the object side 51 of the fifth lens L5 at the optical axis, R10 is a curvature radius of the image side 52 of the fifth lens L5 at the optical axis, by reasonably matching the curvature radius of the object side 51 and the image side 52 of the fifth lens L5 at the optical axis, the difference of the surface type of the fifth lens L5 is reasonably set, and the light passing through the front lens group (the first lens L1 to the fourth lens L4) is gently incident on the rear lens group.

[0102] In some embodiments, the optical lens 100 satisfies a relationship -8<F1 / CT1<-6, F1 is a focal length of the first lens L1, CT1 is a 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, the refractive power of the first lens L1 is reasonably configured, the angle of the light entering the first lens L1 is effectively controlled, and the aberration is corrected.

[0103] In some embodiments, the optical lens 100 satisfies a relationship -8<F2 / CT2<-4, F2 is a focal length of the second lens L2, CT2 is a thickness of the second lens L2 on the optical axis, the refractive power of the second lens L2 is not too strong, and can cooperate with the first lens L1 to correct the spherical aberration, so that the optical lens 100 has good imaging quality.

[0104] In some embodiments, the optical lens 100 satisfies a relationship 3 < F3 / CT3 < 20, F3 is the focal length of the third lens L3, and CT3 is the thickness of the third lens L3 on the optical axis. When the optical lens 100 exceeds the upper limit of the above relationship, the focal length of the third lens L3 is too large, the refractive power is too strong, which can cause the third lens L3 to be sensitive to changes, and the optical lens 100 is prone to large aberrations. When the optical lens 100 is lower than the lower limit of the above relationship, the thickness of the third lens L3 on the optical axis increases, which is not conducive to reducing the processing cost of the optical lens 100.

[0105] In some embodiments, the optical lens 100 satisfies a relationship 2 < F4 / CT4 < 4, F4 is the focal length of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis. The fourth lens L4 can be reasonably configured to correct the spherical aberration and chromatic aberration, thereby improving the imaging quality of the optical lens 100.

[0106] In some embodiments, the optical lens 100 satisfies a relationship -4.5 < F5 / CT5 < -3, F5 is the focal length of the fifth lens L5, and CT5 is the thickness of the fifth lens L5 on the optical axis. The fifth lens L5 can be reasonably configured to effectively control the deflection angle of the light in the optical lens 100, thereby reducing the sensitivity of the optical lens 100 and improving the resolution. When the optical lens 100 exceeds the upper limit of the above relationship, the thickness of the fifth lens L5 is too small, which causes the edge light deflection angle to be too small, which is not conducive to correcting the aberration of the optical lens 100, thereby not conducive to improving the imaging quality of the optical lens 100. When the optical lens 100 is lower than the lower limit of the above relationship, the focal length of the fifth lens L5 is too small, which causes the deflection angle of the light in the optical lens 100 to be too large, which is not conducive to the convergence of the light on the imaging surface 101.

[0107] In some embodiments, the optical lens 100 satisfies a relationship 0.8 < F6 / CT6 < 2.1, F6 is the focal length of the sixth lens L6, and CT6 is the thickness of the sixth lens L6 on the optical axis. The sixth lens L6 can cooperate with the fifth lens L5 to balance the high-order aberration and improve the quality of the optical lens 100.

[0108] In some embodiments, the optical lens 100 satisfies a relationship 4 < F7 / CT7 < 15, F7 is the focal length of the seventh lens L7, and CT7 is the thickness of the seventh lens L7 on the optical axis. By reasonably controlling the relationship between the focal length of the seventh lens L7 and the thickness of the seventh lens L7, the focal length of the seventh lens L7 will not be too large, which is conducive to correcting the aberration and reducing the tolerance sensitivity of the seventh lens L7, thereby reducing the processing difficulty and improving the assembly yield of the optical lens 100.

[0109] The optical lens 100 of the present embodiment will be described in detail below in conjunction with specific parameters.

[0110] First embodiment

[0111] The first embodiment of the present application discloses a structural schematic diagram of the optical lens 100 as shown in the figure. The optical lens 100 comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm 102, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter 110, and a protective glass 120 arranged in sequence along the optical axis from the object side to the image side. Figure 1 The object side surface 11 of the first lens L1 is convex at the vicinity of the optical axis, and the image side surface 12 of the first lens L1 is concave at the vicinity of the optical axis. The object side surface 21 of the second lens L2 is concave at the vicinity of the optical axis, and the image side surface 22 of the second lens L2 is concave at the vicinity of the optical axis. The object side surface 31 of the third lens L3 is concave at the vicinity of the optical axis, and the image side surface 32 of the third lens L3 is convex at the vicinity of the optical axis. The object side surface 41 of the fourth lens L4 is convex at the vicinity of the optical axis, and the image side surface 42 of the fourth lens L4 is convex at the vicinity of the optical axis. The object side surface 51 of the fifth lens L5 is concave at the vicinity of the optical axis, and the image side surface 52 of the fifth lens L5 is concave at the vicinity of the optical axis. The object side surface 61 of the sixth lens L6 is convex at the vicinity of the optical axis, and the image side surface 62 of the sixth lens L6 is convex at the vicinity of the optical axis. The object side surface 71 of the seventh lens L7 is convex at the vicinity of the optical axis, and the image side surface 72 of the seventh lens L7 is convex at the vicinity of the optical axis.

[0112]

[0113] ​Specifically, taking the focal length F = 1.48305 mm of the optical lens 100, the aperture number FNO = 1.55 of the optical lens 100, and half of the maximum field of view angle HFOV = 103 deg of the optical lens 100 as examples, other parameters of the optical lens 100 are given in Table 1 below. In Table 1, the elements along the optical axis of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1 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 surfaces with serial numbers 1 and 2 are 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 with the corresponding surface serial number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens at the optical axis, 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. The value in the "thickness" parameter column of the diaphragm 102 is the distance from the vertex of the diaphragm 102 to the vertex of the next surface at the optical axis, and the positive direction of the optical axis is by default from the object side surface of the first lens L1 to the image side surface of the last lens. When the value is negative, it indicates that the diaphragm 102 is disposed on the image side of the vertex of the next surface. If the thickness of the diaphragm 102 is positive, the diaphragm 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 587.5618 nm, and the focal length is obtained at a reference wavelength of 546 nm.

[0114] Table 1

[0115]

[0116] In the first embodiment, the object side surface and the image side surface of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 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:

[0117]

[0118] wherein x is the sag of the aspherical surface at a height of h along the optical axis, c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the inverse of the radius of curvature Y in Table 1 above), K is the conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7.

[0119] Table 2

[0120]

[0121]

[0122] Please see Figure 2 (A) in the middle Figure 2 (A) in the figure is a spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm. The horizontal axis along the X-axis represents the focus shift 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 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.

[0123] Please see Figure 2 (B) in the middle Figure 2 (B) in the figure shows the light astigmatism of the optical lens 100 in the first embodiment at a wavelength of 546 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 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, at this wavelength, the field curvature of the optical lens 100 is small, and the field curvature and astigmatism of each field of view are well corrected. The center and edge of the field of view have clear imaging, that is, the astigmatism of the optical lens 100 is well compensated.

[0124] Please see Figure 2 (C) in the middle, Figure 2 (C) in the diagram represents the distortion of the optical lens 100 in the first embodiment at a wavelength of 546 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 3 As can be seen from (C), at this wavelength, the image distortion caused by the main beam is small, and the distortion of the optical lens 100 is well corrected.

[0125] Second Embodiment

[0126] The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of this application is shown below. Figure 4 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop 102, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter 110, and a protective glass 120 arranged sequentially along the optical axis from the object side to the image side.

[0127] The object side surface 11 of the first lens L1 is convex at the vicinity of the optical axis, the image side surface 12 of the first lens L1 is concave at the vicinity of the optical axis; the object side surface 21 of the second lens L2 is convex at the vicinity of the optical axis, the image side surface 22 of the second lens L2 is concave at the vicinity of the optical axis; the object side surface 31 of the third lens L3 is concave at the vicinity of the optical axis, the image side surface 32 of the third lens L3 is convex at the vicinity of the optical axis; the object side surface 41 of the fourth lens L4 is convex at the vicinity of the optical axis, the image side surface 42 of the fourth lens L4 is convex at the vicinity of the optical axis; the object side surface 51 of the fifth lens L5 is convex at the vicinity of the optical axis, the image side surface 52 of the fifth lens L5 is concave at the vicinity of the optical axis; the object side surface 61 of the sixth lens L6 is convex at the vicinity of the optical axis, the image side surface 62 of the sixth lens L6 is convex at the vicinity of the optical axis; the object side surface 71 of the seventh lens L7 is convex at the vicinity of the optical axis, the image side surface 72 of the seventh lens L7 is concave at the vicinity of the optical axis.

[0128] Specifically, taking the focal length F of the optical lens 100 as 1.40831mm, the F number FNO of the optical lens 100 as 1.62, and the half of the maximum field of view angle HFOV of the optical lens 100 as 101deg as examples, other parameters of the optical lens 100 are shown in Table 3 below. And the definition of each parameter can be obtained from the foregoing description of the embodiments, which will not be repeated here. And the refractive index, Abbe number and the like in Table 3 are obtained at the reference wavelength of 587.5618nm, and the focal length is obtained at the reference wavelength of 546nm.

[0129] Table 3

[0130]

[0131] In the second embodiment, Table 4 shows the high-order term coefficients A4, A6, A8, A10, A12 of each aspheric surface of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7, wherein each aspheric surface can be defined by the formula given in the first embodiment.

[0132] Table 4

[0133]

[0134] Please refer to Figure 4 (A) in Figure 4 (A) in Figure 4As shown in (A) of FIG. 6, the optical lens 100 in the second embodiment has a better spherical aberration value, which indicates that the imaging quality of the optical lens 100 in the second embodiment is better.

[0135] As shown in (B) of FIG. 6, Figure 4 As shown in (B) of FIG. 6, Figure 4 As shown in (B) of FIG. 6, the astigmatism graph of the optical lens 100 in the second embodiment at a wavelength of 555 nm is shown. Wherein, the abscissa along the X-axis direction represents the focal shift, in mm, and the ordinate along the Y-axis direction represents the field angle, in deg. In the astigmatism graph, 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, which are calculated by Figure 4 As shown in (B) of FIG. 6, at this wavelength, the optical lens 100 has a small field curvature, and the field curvature and astigmatism of each field are well corrected, and the center and edge of the field have clear imaging, i.e., the astigmatism of the optical lens 100 is well compensated.

[0136] As shown in (C) of FIG. 6, Figure 4 As shown in (C) of FIG. 6, Figure 4 As shown in (C) of FIG. 6, the distortion graph of the optical lens 100 in the second embodiment at a wavelength of 555 nm is shown. Wherein, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the field angle, in deg. Which is calculated by Figure 5 As shown in (C) of FIG. 6, at this wavelength, the image distortion caused by the main light beam is small, and the distortion of the optical lens 100 is well corrected.

[0137] Third Embodiment

[0138] The structural schematic diagram of the optical lens 100 disclosed by the third embodiment of the present application is shown in FIG. 7. Taking the focal length F of the optical lens 100 as 1.2754 mm, the F number FNO of the optical lens 100 as 1.65, and the half of the maximum field angle HFOV of the optical lens 100 as 102.5 deg as examples, other parameters of the optical lens 100 are given in Table 5 below. And the definition of each parameter can be obtained from the foregoing description of the embodiments, which will not be repeated here. And the refractive index, Abbe number, etc. in Table 5 are obtained at a reference wavelength of 587.5618 nm, and the focal length is obtained at a reference wavelength of 546 nm. In addition, for the refractive power of each lens and the correspondence between the surface serial number and the object side surface and the image side surface of each lens, please refer to the description of the foregoing second embodiment, which will not be repeated here. Figure 6 Table 5

[0139]

[0140]

[0141] ​In the third embodiment, the high order term coefficients A4, A6, A8, A10, A12 of each aspherical surface of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7 are given in Table 6, wherein each aspherical surface can be defined by the formula given in the first embodiment.

[0142] Table 6

[0143]

[0144] Please refer to Figure 6 , the curves in (A) the spherical aberration diagram, (B) the ray fan diagram and (C) the distortion diagram of Figure 6 , it can be seen that the spherical aberration, the fan and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A) of Figure 6 , (B) of Figure 6 and (C) of Figure 4 , please refer to the descriptions of the wavelengths corresponding to the curves in (A) of Figure 4 , (B) of Figure 4 and (C) of Figure 7 of the second embodiment, which will not be repeated here.

[0145] Fourth embodiment

[0146] The structural schematic diagram of the optical lens 100 disclosed by the fourth embodiment of the present application is shown in Figure 8 , taking the focal length F of the optical lens 100 = 1.36604mm, the aperture number FNO of the optical lens 100 = 1.62, half of the maximum field angle of the optical lens 100 HFOV = 101 deg as an example, other parameters of the optical lens 100 are given in Table 7 below. And the definition of each parameter can be obtained from the foregoing description of the embodiments, which will not be repeated here. And the refractive index, Abbe number and the like in Table 7 are obtained at the reference wavelength of 587.5618nm, and the focal length is obtained at the reference wavelength of 546nm. In addition, for the refractive power of each lens and the correspondence between the surface number and the object side surface and the image side surface of each lens, please refer to the description of the second embodiment, which will not be repeated here.

[0147] Table 7

[0148]

[0149]

[0150] In the fourth embodiment, the high order term coefficients A4, A6, A8, A10, A12 of each aspherical surface of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7 are given in Table 8, wherein each aspherical surface can be defined by the formula given in the first embodiment.

[0151] Table 8

[0152]

[0153] Please refer to Figure 8 , the curves in (A) the spherical aberration diagram, (B) the ray fan diagram and (C) the distortion diagram of Figure 8 , it can be seen that the spherical aberration, the fan and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A) of Figure 8 , (B) of Figure 8 and (C) of Figure 4 , please refer to the descriptions of the wavelengths corresponding to the curves in (A) of Figure 4 , (B) of Figure 4 and (C) of Figure 9 of the second embodiment, which will not be repeated here.

[0154] Fifth embodiment

[0155] The structure diagram of the optical lens 100 disclosed by the fifth embodiment of the present application is shown in Figure 10 , taking the focal length F of the optical lens 100 = 1.39866mm, the aperture number FNO of the optical lens 100 = 1.6, half of the maximum field angle of the optical lens 100 HFOV = 100deg as an example, other parameters of the optical lens 100 are given in Table 9 below. And the definition of each parameter can be obtained from the foregoing description of the embodiments, which will not be repeated here. And the refractive index, Abbe number and the like in Table 9 are obtained at the reference wavelength of 587.5618nm, and the focal length is obtained at the reference wavelength of 546nm. In addition, for the correspondence between the surface number and the object side surface and the image side surface of each lens, please refer to the description of the second embodiment described above, which will not be repeated here.

[0156] Table 9

[0157]

[0158]

[0159] In the fifth embodiment, Table 10 shows the high-order term coefficients A4, A6, A8, A10, A12 of each aspherical surface of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7, wherein each aspherical surface can be defined by the formula given in the first embodiment.

[0160] Table 10

[0161]

[0162] Referring to Figure 10 , it can be seen from (A) the spherical aberration diagram, (B) the ray fan diagram, and (C) the distortion diagram in Figure 10 that the spherical aberration, the fan, and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to each curve in (A) of Figure 10 , (B) of Figure 10 , and (C) of Figure 4 can refer to the descriptions about (A) of Figure 4 , (B) of Figure 4 , and (C) of Relationship / Embodiments in the second embodiment, which will not be repeated here.

[0163] Referring to Table 11, Table 11 is a summary of the ratios of the relationships in the first embodiment to the fifth embodiment of the present application.

[0164] Table 11

[0165]

[0166] In some embodiments, the optical lens 100 satisfies the following relationship: -6 < F1 / F < -4, -4 < F2 / F < -2, F3 / F > 5, F4 / F > 3, -2 < F5 / F < -1, 1 < F6 / F < 2.5; wherein F1 is the focal length of the first lens L1, 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, F6 is the focal length of the sixth lens L6, F is the focal length of the optical lens 100. By satisfying the above formula, the optical power distribution can be uniform and reasonable, the aberration can be easily corrected, and the image quality can be good.

[0167] Referring to Table 12, Table 12 is the value of F1 / F, F2 / F, F3 / F, F4 / F, F5 / F, F6 / F in the first embodiment to the fifth embodiment of the present application.

[0168] Table 12

[0169] First Embodiment Second Embodiment Third Embodiment Fourth Embodiment Fifth Embodiment F1 / F F2 / F -4.9354 -4.8381 -5.7415 -5.1165 -4.8030 F3 / F -2.8975 -3.1937 -2.9824 -3.3455 -3.3920 F4 / F 5.5573 16.9605 9.1000 17.1922 19.8495 F5 / F 3.1882 3.2952 3.8702 3.5064 3.3747 F6 / F -1.5530 -1.5318 -1.8923 -1.7308 -1.6518 Figure 11 2.1599 1.5464 1.9703 1.7007 1.6366

[0170] Please refer to Figure 12 The application also discloses a camera module 200, which comprises an image sensor 201 and the optical lens 100 as described in any one of the first embodiment to the fifth embodiment, and the image sensor 201 is arranged on the image side of the optical lens 100. The photosensitive surface of the image sensor 201 is located at the imaging surface 101 of the optical lens 100, and the light rays of an object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The image sensor 201 can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 200 can be an imaging module integrated on a terminal device 300 or can be a separate lens. It can be understood that the camera module 200 with the optical lens 100 has all the technical effects of the optical lens 100, that is, the camera module 200 can have high imaging quality while meeting the design requirement of miniaturization. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be described here.

[0171] The application also discloses a terminal device 300, which comprises a housing 301 and the camera module 200 described above, and the camera module 200 is arranged on the housing 301. The terminal device 300 can include but is not limited to a mobile phone, a tablet computer, a notebook computer, a smart watch, a vehicle-mounted device, a drone, a monitor and the like. Please refer to Figure 13 Taking the terminal device 300 as a mobile phone as an example, the camera module 200 can be arranged on the housing 301.

[0172] Please refer to ​ The terminal device 300 can also be a vehicle, and the housing 301 can be a vehicle body, and the camera module 200 can be arranged on the vehicle body, for example, can be arranged inside or outside the vehicle body.

[0173] It can be understood that the terminal device 300 with the camera module 200 also has all the technical effects of the optical lens 100. That is, the terminal device 300 can have high imaging quality while meeting the design requirement of miniaturization. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be described here.

[0174] The optical lens, the camera module and the terminal device disclosed in the embodiments of the present application are described in detail, and the principles and implementation manners of the present application are described by applying specific examples; the above embodiment description 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 on the basis of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An optical lens characterized in that, There are seven lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis from the object side to the image side; The first lens has negative refractive power, the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; The second lens has negative refractive power, and the image side surface of the second lens is concave at the near optical axis; The third lens has positive refractive power, the object side surface of the third lens is concave at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are both convex at the near optical axis; The fifth lens has negative refractive power, and the image side surface of the fifth lens is concave at the near optical axis; The sixth lens has positive refractive power, and the object side surface and the image side surface of the sixth lens are both convex at the near optical axis; The seventh lens has positive refractive power, and the object side surface of the seventh lens is convex at the near optical axis; The optical lens satisfies the following relationship: 11 < TTL / F < 14, 200 deg ≤ FOV ≤ 206 deg, and 7 < TTL / BFL < 8.1; Wherein, 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, F is the focal length of the optical lens, FOV is the maximum field of view angle of the optical lens, and BFL is the distance from the image side surface of the seventh 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: 120 deg < FOV / FNO < 135 deg, and / or, 3.5 < H / F < 4.2; Wherein, FNO is the aperture number of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens.

3. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 2 < (CT5+CT6+CT7) / F < 3, and / or, |F56 / F| > 5, and / or, 2 < F567 / F1234 < 7; Wherein, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, F56 is the combined focal length of the fifth lens and the sixth lens, F567 is the combined focal length of the fifth lens, the sixth lens and the seventh lens, and F1234 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens.

4. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 2 < F4 / CT4 < 4, and / or, -4.5 < F5 / CT5 < -3, and / or, 4 < (F4-F5) / F < 6; Wherein, F4 is the focal length of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, F5 is the focal length of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis.

5. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 0.9 < CT45 / CT34 < 11, and / or, 1 < SD6 / SD7 < 1.3; CT34 is a distance on the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens, CT45 is a distance on the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens, SD6 is a maximum effective half-aperture radius of the image-side surface of the third lens, and SD7 is a maximum effective half-aperture radius of the object-side surface of the fourth lens.

6. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: 3 < R1*ND1 / SD1 < 4, and / or, 3.4 < SD1 / SAG1 < 3.9, and / or, 1.1 < SD1 / H < 1.4; wherein R1 is a curvature radius of the object-side surface of the first lens at the optical axis, ND1 is a refractive index of the first lens, SD1 is a maximum effective half-aperture radius of the object-side surface of the first lens, SAG1 is a distance on the optical axis from a point of intersection of the object-side surface of the first lens with the optical axis to a maximum effective aperture of the object-side surface of the first lens, and H is an image height corresponding to a maximum field angle of the optical lens.

7. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: |SAG14 / SAG13| < 30, and / or, 1.6 < CT7 / ET7 < 2.1, and / or, 4 < F7 / F < 12; wherein SAG13 is a distance on the optical axis from a point of intersection of the object-side surface of the seventh lens with the optical axis to a maximum effective aperture of the object-side surface of the seventh lens, SAG14 is a distance on the optical axis from a point of intersection of the image-side surface of the seventh lens with the optical axis to a maximum effective aperture of the image-side surface of the seventh lens, CT7 is a thickness of the seventh lens on the optical axis, ET7 is a distance in a direction parallel to the optical axis from a maximum effective half-aperture radius of the object-side surface of the seventh lens to a maximum effective half-aperture radius of the image-side surface of the seventh lens, and F7 is a focal length of the seventh lens.

8. The optical lens of claim 1, wherein, The optical lens satisfies the following relationship: -1.5 < R7 / R8 / ND4 < -0.5, and / or, -10 < R12 / R11 < -2, and / or, |R14 / R13| < 10; wherein R7 is a curvature radius of the object-side surface of the fourth lens at the optical axis, R8 is a curvature radius of the image-side surface of the fourth lens at the optical axis, ND4 is a refractive index of the fourth lens, R11 is a curvature radius of the object-side surface of the sixth lens at the optical axis, R12 is a curvature radius of the image-side surface of the sixth lens at the optical axis, R13 is a curvature radius of the object-side surface of the seventh lens at the optical axis, and R14 is a curvature radius of the image-side surface of the seventh lens at 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, wherein the image sensor is disposed on an image side of the optical lens.

10. A terminal device, comprising: The camera module according to claim 9 is disposed in the housing.

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