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 a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has negative refractive power, the second lens has refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has refractive power, and the sixth lens has refractive power. The fifth lens has negative refractive power, the sixth lens has positive refractive power, and the optical lens satisfies the following relational expressions: 1.5 lt; a TTL / CTALlt; 2.2, 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, and CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis. According to the optical lens provided by the invention, the light, thin and miniaturized design of the optical lens can be realized, and meanwhile, the optical lens has relatively high imaging quality.

Description

Technical Field

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

[0002] With the development of the automotive industry, in order to provide drivers with a better driving experience, camera modules are widely used in various vehicle systems (such as advanced driving assistance systems (i.e., Advanced Driving Assistance System), driving recorder systems, reversing images, etc.) to achieve functions such as automatic driving and monitoring of vehicles. However, with the development trend of miniaturization of optical lenses, it is difficult to simultaneously meet people's requirements for high-definition imaging of optical lenses. Summary of the invention

[0003] The embodiments of the present invention disclose an optical lens, a camera module and a terminal device, which can achieve a light, thin and miniaturized design of the optical lens while having high imaging quality.

[0004] In order to achieve the above-mentioned object, in a first aspect, the present invention discloses an optical lens, which has a total of six lenses with refractive power, and includes, in order from the object side to the image side along the optical axis:

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

[0006] A second lens having refractive power, wherein the image side surface of the second lens is convex at the near optical axis;

[0007] A third lens element has positive refractive power, and the image side surface of the third lens element is convex at the near optical axis;

[0008] a fourth lens having positive refractive power, wherein the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis;

[0009] a fifth lens element having negative refractive power, wherein the object side surface of the fifth lens element is concave at a position close to the optical axis;

[0010] a sixth lens element having positive refractive power, wherein the object side surface of the sixth lens element is convex near the optical axis;

[0011] The optical lens satisfies the following relationship:

[0012] 1.5 <TTL / CTAL<2.2;105deg<FOV<130deg;

[0013] Among them, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, that is, the total optical length, CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis, and FOV is the maximum field of view angle of the optical lens.

[0014] By setting the first lens to have a negative refractive power and the image side to be concave near the optical axis, it is beneficial for large-angle incident light to enter the optical lens, expanding the field of view angle range of the optical lens, thereby obtaining the characteristic of a large field of view angle; the image side of the second lens is convex near the optical axis, which can make the incident light passing through the first lens enter the optical lens more smoothly, facilitating the correction of the field curvature and astigmatism of the optical lens, enhancing the stability of the imaging effect of the optical lens, and thus improving the imaging quality of the optical lens; when light enters the third lens with a positive refractive power, due to the design that the image side of the third lens is convex near the optical axis, the light collected by the first lens and the second lens can be compressed, making the incident light transition smoothly to improve the relative illumination of the optical lens; the fourth lens has a positive refractive power, and with the configuration that both the object side and the image side are convex near the optical axis, it further strengthens the convergence of the central and peripheral field light, which is beneficial for the miniaturization design of the optical lens; the fifth lens has a negative refractive power and the object side is concave near the optical axis, which is beneficial for correcting the aberration generated in the third lens and the fourth lens and improving the imaging quality of the optical lens; the sixth lens has a positive refractive power and the object side is convex near the optical axis, which is beneficial for suppressing the principal ray deflection angle of the optical lens and reducing the risk of vignetting.

[0015] In addition, the optical lens satisfies 1.5 < TTL / CTAL < 2.2. By reasonably configuring the thicknesses of each lens and the total optical length, it is beneficial for the injection molding and assembly of each lens, improving the assembly yield of the optical lens. At the same time, each lens can perform surface shape changes and arrangements within sufficient space, effectively shortening the total optical length of the optical lens, making the overall structure of the optical lens more compact, and realizing the miniaturization and thin-and-light design of the optical lens.

[0016] In addition, the optical lens satisfies 105deg < FOV < 130deg. By reasonably configuring the maximum field of view angle of the optical lens, the optical lens has a large field of view angle, which is beneficial for the optical lens to obtain more scene content, thereby enriching the imaging information of the optical lens.

[0017] In a second aspect, the present invention discloses an imaging module, which includes an image sensor and the optical lens as described in the first aspect above. The image sensor is disposed on the image side of the optical lens. The imaging module with this optical lens can achieve a thin-and-light and miniaturized design while having high imaging quality.

[0018] In a third aspect, the present invention discloses a terminal device, the terminal device comprising a fixing part and the camera module as described in the second aspect, the camera module being arranged on the fixing part. The terminal device having the camera module can realize a light and small design while having a high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present invention;

[0021] Figure 2 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical lens disclosed in the first embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of an optical lens disclosed in a second embodiment of the present invention;

[0023] Figure 4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical lens disclosed in the second embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of an optical lens disclosed in a third embodiment of the present invention;

[0025] Figure 6 is a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical lens disclosed in the third embodiment of the present invention;

[0026] Figure 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present invention;

[0027] Figure 8 is a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical lens disclosed in the fourth embodiment of the present invention;

[0028] Fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present invention;

[0029] Fig.10 is a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical lens disclosed in the fifth embodiment of the present invention;

[0030] Fig.11 It is a structural schematic diagram of the camera module disclosed in the present invention;

[0031] Fig.12 It is a structural schematic diagram of the device terminal disclosed in the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the first aspect, the present invention discloses an optical lens, which has six lenses with refractive power, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in order from the object side to the image side along the optical axis. When imaging, light enters the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in order from the object side of the first lens, and finally forms an image on the imaging surface of the optical lens.

[0034] Further, the first lens has negative refractive power, the second lens has positive refractive power or negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, and the sixth lens has positive refractive power.

[0035] Further, the object side surface of the first lens is convex, concave or flat at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; the object side surface of the second lens is convex or concave at the near optical axis, and the image side surface of the second lens is convex at the near optical axis; the object side surface of the third lens is convex or concave at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis; the object side surface of the fifth lens is concave at the near optical axis, and the image side surface of the fifth lens is convex or concave at the near optical axis; the object side surface of the sixth lens is convex at the near optical axis, and the image side surface of the sixth lens is convex or concave at the near optical axis.

[0036] By setting the first lens to have negative refractive power and the image side surface to be concave at the near optical axis, it is beneficial for incident light at a large angle to enter the optical lens, thereby expanding the field angle range of the optical lens, thereby obtaining the characteristics of a large field angle; the image side surface of the second lens to be convex at the near optical axis can make the incident light through the first lens enter the optical lens more smoothly, which is beneficial for correcting the field curvature and astigmatism of the optical lens, enhancing the stability of the imaging effect of the optical lens, thereby improving the imaging quality of the optical lens; when the light enters the third lens with positive refractive power, since the image side surface of the third lens is convex at the near optical axis, the first lens and the second lens can be adjusted. The light collected by the lens is compressed so that the incident light transitions smoothly to improve the relative illumination of the optical lens; the fourth lens has positive refractive power, and the object side and the image side are both convex at the near optical axis, which further strengthens the convergence of the center and edge field light, thereby facilitating the miniaturization design of the optical lens; the fifth lens has negative refractive power, and the object side is concave at the near optical axis, which is conducive to correcting the aberrations generated in the third lens and the fourth lens and improving the imaging quality of the optical lens; the sixth lens has positive refractive power, and the object side is convex at the near optical axis, which is conducive to suppressing the deflection angle of the main light of the optical lens and reducing the risk of generating dark angles.

[0037] Further, in some embodiments, the material of each lens is glass, so that the optical lens has a good optical effect and reduces the temperature drift sensitivity of the optical lens. In other embodiments, the material of each lens is plastic, so as to reduce the weight of the optical lens and reduce the cost. Alternatively, it can be understood that the material of each lens of the optical lens can be selected according to actual needs, for example, all lenses are made of plastic, or all are made of glass, or lenses of different materials are mixed and used, so that the optical lens has a lower temperature drift sensitivity and a lighter overall weight, which is not specifically limited here.

[0038] In some embodiments, considering that the spherical lens has the characteristics of simple manufacturing process and low production cost, and can be convenient for flexible design of the surface shape of the lens, the imaging resolution ability of the optical lens is improved. The aspherical lens can make the object side or image side of the lens have a more flexible design, so that the lens can solve the undesirable phenomena such as unclear imaging, distorted vision or narrow field of view in the case of small size and thinness, and the optical lens can have good imaging quality without too many lenses, which is conducive to shortening the length of the optical lens. Based on this, the first lens, the second lens, the third lens, the fourth lens and the fifth lens can adopt spherical lenses, and the sixth lens is an aspherical lens. In this way, through the combined design of spherical and aspherical surfaces, not only can the processability of each lens be improved, which is conducive to surface shape design, but also the object side or image side of the lens can have a more flexible design, so that each lens can solve the undesirable phenomena such as unclear imaging, distorted vision or narrow field of view in the case of small size and thinness, and the optical lens can have good imaging quality without too many lenses, which is conducive to shortening the length of the optical lens. It can be understood that in other embodiments, the surfaces of each lens in the optical lens may be all spherical, all aspherical, or any combination of spherical and aspherical surfaces, and the specific selection can be made according to actual needs, so it is not specifically limited in this embodiment.

[0039] In some embodiments, the optical lens further includes a stop, which may be an aperture stop and / or a field stop, for example, the stop may be an aperture stop, or the stop may be a field stop, or the stop may be an aperture stop and a field stop. By arranging the stop between the image side surface of the second lens and the object side surface of the third lens or between the image side surface of the third lens and the object side surface of the fourth lens, the exit pupil can be moved away from the imaging surface, and the effective diameter of the optical lens can be reduced without reducing the telecentricity of the optical lens, thereby achieving miniaturization. It is understandable that in other embodiments, the stop may also be arranged between other lenses, and the arrangement may be adjusted according to actual conditions, and this embodiment does not specifically limit this.

[0040] In some embodiments, the optical lens further includes an infrared filter, and the infrared filter is disposed between the sixth lens and the imaging surface of the optical lens. Optionally, the infrared filter may be an infrared cutoff filter to filter out infrared light and pass visible light, so that the imaging is more in line with the visual experience of the human eye, thereby improving the imaging quality. In other embodiments, the infrared filter may be an infrared bandpass filter to allow infrared light to pass through and reflect visible light to achieve infrared imaging of the optical lens, so that the optical lens can image in a dark environment or special application scenarios and obtain better imaging quality. It is understandable that the infrared filter may be made of plastic, or may be made of optical glass coating, or an infrared filter of other materials, which may be selected according to actual needs and is not specifically limited in this embodiment.

[0041] In some embodiments, the optical lens further includes a protective glass disposed between the infrared filter and the imaging surface of the optical lens, thereby protecting the image sensor and preventing dust. The protective glass can be made of plastic, optical glass with a coating, or other materials, and can be selected according to actual needs, without specific limitation in this embodiment. It can be understood that the protective glass can be part of the optical lens or removed from the optical lens, but when the protective glass is removed, the overall optical length of the optical lens remains unchanged.

[0042] In some embodiments, the optical lens satisfies the relationship: 1.5 < TTL / CTAL < 2.2. Here, 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, and CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis.

[0043] By reasonably configuring the thicknesses and the overall optical length of each lens, it is beneficial to the injection molding and assembly of each lens, improving the assembly yield of the optical lens. At the same time, each lens can change its surface shape and be arranged within sufficient space, effectively shortening the overall optical length of the optical lens, making the overall structure of the optical lens more compact, and achieving the miniaturization and thin-and-light design of the optical lens.

[0044] In some embodiments, the optical lens satisfies the relationship: 105deg < FOV < 130deg. Further, the optical lens can satisfy the relationship: 110deg ≤ FOV ≤ 120deg. Here, FOV is the maximum field of view angle of the optical lens.

[0045] By reasonably configuring the maximum field of view angle of the optical lens, the optical lens has a large field of view angle, which is beneficial for the optical lens to capture more scene content, and thus enriches the imaging information of the optical lens.

[0046] In some embodiments, the optical lens further includes a diaphragm located between the image side surface of the second lens and the object side surface of the third lens or between the image side surface of the third lens and the object side surface of the fourth lens. The optical lens satisfies the relationship: -8.7 < EDS*TAN(FOV) / F < -6.2. Here, EDS is the maximum effective aperture of the diaphragm, FOV is the maximum field of view angle of the optical lens, and F is the focal length of the optical lens.

[0047] By reasonably configuring the relationship between the field of view angle, the diaphragm aperture and the focal length of the optical lens, it can ensure that the optical lens has sufficient image plane brightness and small distortion within the wide-angle imaging range, ensuring that the optical lens has high imaging quality characteristics and can capture the details of the photographed object well.

[0048] In some embodiments, the optical lens satisfies the relationship: 2 < F456 / F < 3. Wherein, F456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens, and F is the focal length of the optical lens.

[0049] By reasonably configuring the refractive power distribution of the fourth lens, the fifth lens, and the sixth lens, on the one hand, it is beneficial to control the height of the light beam exiting the optical lens to reduce the high-order aberrations of the optical lens; on the other hand, it can correct the influence of the field curvature generated by the first lens to the third lens on the resolving power of the optical lens.

[0050] In some embodiments, the fourth lens and the fifth lens are cemented, and a refractive power configuration method of one positive and one negative is adopted, which is beneficial to the mutual correction of the aberrations of the optical lens.

[0051] In some embodiments, the optical lens satisfies the relationship: 3.3 < SD6 / CT34 < 22.6. Wherein, SD6 is half of the maximum effective aperture of the image side of the third lens, and CT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens.

[0052] By reasonably configuring the ratio relationship between the effective aperture of the image side of the third lens and the air gap between the third lens and the fourth lens, and then controlling the height of the third lens and the fourth lens in the direction perpendicular to the optical axis, it is beneficial for the light to enter gently, and at the same time, the edge thickness of the lens will not be too small, which is beneficial to the assembly of the third lens and the fourth lens and improves the manufacturing yield of the optical lens.

[0053] In some embodiments, the optical lens satisfies the relationship: |SD1*SAGS1| < 2.5mm 2 . Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, and SAGS1 is the sagittal height at the maximum effective aperture of the object side of the first lens, that is, the distance on the optical axis from the intersection 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.

[0054] By reasonably configuring the aperture and sagittal height of the object side of the first lens, on the one hand, it can avoid the object side of the first lens from being too curved, reduce the processing difficulty of the first lens and is beneficial for large-angle light to enter the optical lens; on the other hand, it can avoid the aperture of the object side of the first lens from being too large, resulting in too large a size of the optical lens in the direction perpendicular to the optical axis, which is not conducive to the miniaturization of the optical lens.

[0055] In some embodiments, the optical lens satisfies the relationship: -5.3 < F1 / CT1 < -4.3. Wherein, F1 is the focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis.

[0056] By designing the first lens as a negative lens to provide a negative refractive power for the optical lens, it is beneficial to expand the width of the light beam, so that large-angle light can be effectively widened after being refracted and converged by the first lens and fill the pupil, enabling the large-angle light to be fully transmitted to the imaging surface of the optical lens, obtaining a wider field of view range, increasing the imaging range of the object space of the optical lens, providing a wider field of view and having a larger entrance pupil, and being able to capture all the optical information from the object space to the image space provided by the first lens for each lens, so that the optical lens can obtain more scene content, enrich the imaging information of the optical lens and obtain a clear image, thus being beneficial to reflecting the high-pixel shooting characteristics of the optical lens. When exceeding the range of the above relationship, it is not conducive to the correction of the aberration of the optical lens, reduces the imaging quality, and at the same time will also cause a relatively large weight of the first lens, which is not conducive to the lightweight design of the optical lens, or will increase the processing difficulty of the first lens and is not conducive to the processing and forming of the first lens.

[0057] In some embodiments, the optical lens satisfies the relationship: 5 < |F2 / CT2| < 30, and / or, 2 < F3 / CT3 < 6, and / or, 1 < F4 / CT4 < 3, and / or, -10 < F5 / CT5 < -4, and / or, 3 < F6 / CT6 < 10, where F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

[0058] By reasonably configuring the ratio of the focal length and the thickness on the optical axis of each lens, the tolerance sensitivity of the thickness of each lens on the optical axis in the optical lens can be reduced, thereby reducing the processing difficulty of each lens, improving the assembly yield of the optical lens, and reducing the production cost.

[0059] In some embodiments, the optical lens satisfies the relationship: |R12 / R11| < 5.8. Further, the optical lens may satisfy the relationship: 0.5 < |R12 / R11| < 5.8. Where R11 is the curvature radius of the object side surface of the sixth lens at the optical axis, and R12 is the curvature radius of the image side surface of the sixth lens at the optical axis.

[0060] By reasonably configuring the ratio of the curvature radii of the object side and the image side of the sixth lens on the optical axis, the surface shape of the sixth lens can be prevented from being too flat, so that the sixth lens can effectively converge light rays, improve the imaging quality of the optical lens, and at the same time is conducive to the sixth lens effectively correcting the aberration of the optical lens; in addition, while enabling the sixth lens to meet the requirements of optical performance, it is also conducive to preventing the surface shape of the sixth lens from being too curved, which is beneficial to reducing the processing difficulty of the sixth lens and reducing the eccentricity sensitivity and tolerance sensitivity of the optical lens, thereby improving the imaging stability of the optical lens.

[0061] In some embodiments, the optical lens satisfies the relationship: -2 < F1 / F < -1, and / or, 2 < |F2 / F| < 7, and / or, 1.5 < F3 / F < 3.9, and / or, 1.2 < F4 / F < 1.6, and / or, -1.5 < F5 / F < -0.9, and / or, 1 < F6 / F < 5. Wherein, F is the focal length of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, and F6 is the focal length of the sixth lens.

[0062] By reasonably configuring the ratio of the focal lengths of each lens to the focal length of the optical lens, the refractive power distribution of each lens can be made uniform and reasonable, the aberration of the optical lens is easy to correct, and the image quality is good.

[0063] In some embodiments, the optical lens satisfies the relationship: 4.5 < TTL / F < 5.5. Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the focal length of the optical lens.

[0064] By reasonably configuring the ratio of the overall optical length of the optical lens to the focal length, the overall length of the optical lens can be controlled while satisfying a sufficient field of view angle range, which is beneficial to the miniaturization design of the optical lens. When below the lower limit of the relationship, the focal length of the optical lens is too long, which is not conducive to meeting the field of view angle range of the optical lens, resulting in a limited field of view range of the optical lens and less object space information obtained by the optical lens; when exceeding the upper limit of the relationship, the overall optical length of the optical lens is too large, which is not conducive to the miniaturization of the optical lens.

[0065] In some embodiments, the optical lens satisfies the relationship: 4.5mm*10 -6 / ℃ < (CT4 - CT5)*(α4 - α5) < 10.5mm*10 -6 / ℃. 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, α4 is the thermal expansion coefficient of the fourth lens at 30℃~70℃, α5 is the thermal expansion coefficient of the fifth lens at 30℃~70℃, and the unit is 10 -6 / ℃.

[0066] By rationally configuring the center thickness and thermal expansion coefficient of the fourth lens and the fifth lens, it is beneficial to reduce the sensitivity of the fourth lens and the fifth lens, improve the manufacturing yield of the optical lens, and realize the miniaturization of the optical lens, while avoiding the problem of debonding caused by excessive thermal expansion difference between the fourth lens and the fifth lens.

[0067] The surface shape of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0068]

[0069] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from any point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, c = 1 / Y, Y is the radius of curvature (that is, the paraxial curvature c is the reciprocal of the Y radius in Table 1), k is the cone constant, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0070] The optical lens of the present invention will be described in detail below with reference to specific parameters.

[0071] First embodiment

[0072] The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of the present invention is as follows Figure 1 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from the object side to the image side along the optical axis O. The materials of 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 can be referred to the above specific embodiments, which will not be repeated here.

[0073] Furthermore, 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, and the sixth lens L6 has positive refractive power.

[0074] Further, the object side surface S1 of the first lens is convex at the near optical axis O, and the image side surface S2 of the first lens is concave at the near optical axis O; the object side surface S3 of the second lens is concave at the near optical axis O, and the image side surface S4 of the second lens is convex at the near optical axis O; the object side surface S5 of the third lens is convex at the near optical axis O, and the image side surface S6 of the third lens is convex at the near optical axis O; the object side surface S7 of the fourth lens is convex at the near optical axis O, and the image side surface S8 of the fourth lens is convex at the near optical axis O; the object side surface S9 of the fifth lens is concave at the near optical axis O, and the image side surface S10 of the fifth lens is convex at the near optical axis O; the object side surface S11 of the sixth lens is convex at the near optical axis O, and the image side surface S12 of the sixth lens is concave at the near optical axis O.

[0075] Specifically, taking the focal length F of the optical lens 100 as 3.45 mm, the aperture number FNO of the optical lens 100 as 2, the maximum field of view FOV of the optical lens 100 as 118.22 degrees, and the total optical length TTL of the optical lens 100 as 17.1 mm as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements from the object side to the image side along the optical axis O of the optical lens 100 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 of the lens, and the surface with a larger surface number is the image side of the lens, such as surface numbers 1 and 2 correspond to the object side S1 of the first lens and the image side S2 of the first lens, respectively. The Y radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side of the lens to the next surface on the optical axis O. The value of the aperture STO in the "Thickness" parameter column is the distance from the aperture STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. By default, the direction from the object side S1 of the first lens to the image side of the last lens is the positive direction of the optical axis O. When the value is negative, it indicates that the aperture STO is set on the image side of the next surface vertex. If the aperture STO thickness is a positive value, the aperture STO 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, and focal length in Table 1 are all obtained at a reference wavelength of 587.56nm.

[0076] The k in Table 2 is a cone constant, and Table 2 gives the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror surface in the first embodiment.

[0077] Table 1

[0078]

[0079] Table 2

[0080]

[0081] See also Figure 2 In (A), Figure 2 (A) in FIG. 2 shows the longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 656.27 nm, 587.56 nm, 546.07 nm, 486.13 nm and 435.83 nm, respectively. The abscissa along the X-axis direction represents the focus offset in mm, and the ordinate along the Y-axis direction represents the normalized field of view. It can be seen from (A) in FIG. 2 that the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0082] See also Figure 2 In (B), Figure 2 (B) in the figure shows the astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 587.56 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. In the astigmatism diagram, T represents the curvature of the imaging surface IMG in the meridian direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 2 It can be seen from (B) in FIG. 1 that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0083] See also Figure 2 (C) in Figure 2 (C) in FIG. 1 shows a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 587.56 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 distortion of the optical lens 100 is well corrected.

[0084] Second embodiment

[0085] The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of the present application is as follows Figure 3 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from the object side to the image side along the optical axis O. The materials thereof can be referred to the above specific embodiments, and will not be described in detail here.

[0086] Furthermore, 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, and the sixth lens L6 has positive refractive power.

[0087] Further, the object side surface S1 of the first lens is a plane at the near optical axis O, and the image side surface S2 of the first lens is a concave surface at the near optical axis O; the object side surface S3 of the second lens is a concave surface at the near optical axis O, and the image side surface S4 of the second lens is a convex surface at the near optical axis O; the object side surface S5 of the third lens is a convex surface at the near optical axis O, and the image side surface S6 of the third lens is a convex surface at the near optical axis O; the object side surface S7 of the fourth lens is a convex surface at the near optical axis O, and the image side surface S8 of the fourth lens is a convex surface at the near optical axis O; the object side surface S9 of the fifth lens is a concave surface at the near optical axis O, and the image side surface S10 of the fifth lens is a concave surface at the near optical axis O; the object side surface S11 of the sixth lens is a convex surface at the near optical axis O, and the image side surface S12 of the sixth lens is a convex surface at the near optical axis O.

[0088] Specifically, the focal length F of the optical lens 100 is 3.46 mm, the aperture number FNO of the optical lens 100 is 2, the maximum field of view FOV of the optical lens 100 is 118.34 degrees, and the total optical length TTL of the optical lens 100 is 17.101 mm. Other parameters in the second embodiment are given in the following Tables 3 and 4, and the definitions of each parameter can be obtained from the description of the aforementioned embodiment, and will not be repeated here.

[0089] Table 3

[0090]

[0091]

[0092] Table 4

[0093]

[0094] See also Figure 4 ,Depend on Figure 4 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the second embodiment that the longitudinal 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 4 (A) Figure 4 Middle (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0095] Third embodiment

[0096] The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of the present application is as follows: Figure 5 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from the object side to the image side along the optical axis O. The materials thereof can be referred to the above specific embodiments, and will not be described in detail here.

[0097] Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has positive refractive power.

[0098] Further, the object side surface S1 of the first lens is concave at the near optical axis O, and the image side surface S2 of the first lens is concave at the near optical axis O; the object side surface S3 of the second lens is convex at the near optical axis O, and the image side surface S4 of the second lens is convex at the near optical axis O; the object side surface S5 of the third lens is concave at the near optical axis O, and the image side surface S6 of the third lens is convex at the near optical axis O; the object side surface S7 of the fourth lens is convex at the near optical axis O, and the image side surface S8 of the fourth lens is convex at the near optical axis O; the object side surface S9 of the fifth lens is concave at the near optical axis O, and the image side surface S10 of the fifth lens is concave at the near optical axis O; the object side surface S11 of the sixth lens is convex at the near optical axis O, and the image side surface S12 of the sixth lens is convex at the near optical axis O.

[0099] Specifically, the focal length f of the optical lens 100 is 3.73 mm, the aperture number FNO of the optical lens 100 is 2, the maximum field of view FOV of the optical lens 100 is 110 degrees, and the total optical length TTL of the optical lens 100 is 16.921 mm. Other parameters in the third embodiment are given in the following Tables 5 and 6, and the definitions of each parameter can be obtained from the description of the aforementioned embodiments, and will not be repeated here.

[0100] Table 5

[0101]

[0102]

[0103] Table 6

[0104]

[0105] See also Figure 6 ,Depend on Figure 6 (A) Longitudinal spherical aberration diagram, Figure 6 (B) Astigmatism diagram and Figure 6It can be seen from the distortion curve diagram (C) in FIG. 1 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the third embodiment are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 (A) Figure 6 Middle (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0106] Fourth embodiment

[0107] The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is as follows Figure 7 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from the object side to the image side along the optical axis O. The materials thereof can be referred to the above specific embodiments, and will not be described in detail here.

[0108] Furthermore, 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, and the sixth lens L6 has positive refractive power.

[0109] Further, the object side surface S1 of the first lens is concave at the near optical axis O, and the image side surface S2 of the first lens is concave at the near optical axis O; the object side surface S3 of the second lens is concave at the near optical axis O, and the image side surface S4 of the second lens is convex at the near optical axis O; the object side surface S5 of the third lens is convex at the near optical axis O, and the image side surface S6 of the third lens is convex at the near optical axis O; the object side surface S7 of the fourth lens is convex at the near optical axis O, and the image side surface S8 of the fourth lens is convex at the near optical axis O; the object side surface S9 of the fifth lens is concave at the near optical axis O, and the image side surface S10 of the fifth lens is concave at the near optical axis O; the object side surface S11 of the sixth lens is convex at the near optical axis O, and the image side surface S12 of the sixth lens is convex at the near optical axis O.

[0110] Specifically, the focal length F of the optical lens 100 is 3.467 mm, the aperture number FNO of the optical lens 100 is 2, the maximum field of view FOV of the optical lens 100 is 118.2 degrees, and the total optical length TTL of the optical lens 100 is 17.1 mm. Other parameters in the fourth embodiment are given in the following Tables 7 and 8, and the definitions of each parameter can be obtained from the description of the aforementioned embodiments, and will not be repeated here.

[0111] Table 7

[0112]

[0113] Table 8

[0114]

[0115] See also Figure 8 ,Depend on Figure 8 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the fourth embodiment that the longitudinal 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 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0116] Fifth embodiment

[0117] The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of the present application is as follows Fig. 9 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are sequentially arranged from the object side to the image side along the optical axis O. The materials thereof can be referred to the above specific embodiments, and will not be described in detail here.

[0118] Furthermore, 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, and the sixth lens L6 has positive refractive power.

[0119] Further, the object side surface S1 of the first lens is convex at the near optical axis O, and the image side surface S2 of the first lens is concave at the near optical axis O; the object side surface S3 of the second lens is concave at the near optical axis O, and the image side surface S4 of the second lens is convex at the near optical axis O; the object side surface S5 of the third lens is convex at the near optical axis O, and the image side surface S6 of the third lens is convex at the near optical axis O; the object side surface S7 of the fourth lens is convex at the near optical axis O, and the image side surface S8 of the fourth lens is convex at the near optical axis O; the object side surface S9 of the fifth lens is concave at the near optical axis O, and the image side surface S10 of the fifth lens is concave at the near optical axis O; the object side surface S11 of the sixth lens is convex at the near optical axis O, and the image side surface S12 of the sixth lens is convex at the near optical axis O.

[0120] Specifically, the focal length F of the optical lens 100 is 3.25 mm, the aperture number FNO of the optical lens 100 is 2, the maximum field of view FOV of the optical lens 100 is 116 degrees, and the total optical length TTL of the optical lens 100 is 17.106 mm. Other parameters in the fifth embodiment are given in the following Tables 9 and 10, and the definitions of each parameter can be obtained from the description of the aforementioned embodiments, and will not be repeated here.

[0121] Table 9

[0122]

[0123] Table 10

[0124]

[0125]

[0126] See also Fig.10 ,Depend on Fig.10 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the fifth embodiment that the longitudinal 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 the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0127] Please refer to Table 11, which is a summary of the ratios of various relationship equations in the first to fifth embodiments of the present application.

[0128] Table 11

[0129]

[0130] See also Fig.11In the second aspect, the present application further discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any one of the first embodiment to the fifth embodiment of the first aspect, wherein the image sensor 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the object and project it to the image sensor 201, and the image sensor 201 is used to convert the light signal corresponding to the object into an image signal, which will not be described in detail here. It can be understood that the camera module 200 with the optical lens 100 can achieve a light and compact design while having high imaging quality.

[0131] See also Fig.12 In the third aspect, the present application further discloses a terminal device 400, which includes a housing 401 and the camera module 200 as described in the second aspect, and the camera module 200 is arranged in the housing 401. The terminal device 400 may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a smart watch, a monitor, a driving recorder, a reversing image, etc. It can be understood that the terminal device 400 having the above-mentioned camera module 200 also has all the technical effects of the above-mentioned optical lens, that is, it can achieve a light and small design while having a high imaging quality.

[0132] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0133] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens, characterized in that: There are a total of six lenses with refractive power, which sequentially include from the object side to the image side along the optical axis: The first lens has negative refractive power, and the image side of the first lens is concave near the optical axis. The second lens has refractive power, and the image side of the second lens is convex near the optical axis. The third lens has positive refractive power, and the image side of the third lens is convex near the optical axis. The fourth lens has positive refractive power, the object side of the fourth lens is convex near the optical axis, and the image side of the fourth lens is convex near the optical axis. The fifth lens has negative refractive power, and the object side of the fifth lens is concave near the optical axis. The sixth lens has positive refractive power, and the object side of the sixth lens is convex near the optical axis. The optical lens satisfies the following relationships: 1.5 < TTL / CTAL < 2.2; 105deg < FOV < 130deg; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis, and FOV is the maximum field of view angle of the optical lens.

2. The optical lens according to claim 1, characterized in that: The optical lens further includes a diaphragm, and the diaphragm is located between the image side of the second lens and the object side of the third lens or between the image side of the third lens and the object side of the fourth lens. The optical lens satisfies the relationship: -8.7 < EDS*TAN(FOV) / F < -6.2; Wherein, EDS is the maximum effective aperture of the diaphragm, and F is the focal length of the optical lens.

3. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: 2 < F456 / F < 3; Wherein, F456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens, and F is the focal length of the optical lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: 3.3 < SD6 / CT34 < 22.6; Wherein, SD6 is half of the maximum effective aperture of the image side of the third lens, and CT34 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: |SD1*SAGS1|<2.5mm 2 ; Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, and SAGS1 is the sagitta at the maximum effective aperture of the object side of the first lens.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: -5.3 < F1 / CT1 < -4.3; Wherein, F1 is the focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis.

7. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: |R12 / R11| < 5.8; Wherein, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, and R12 is the radius of curvature of the image side of the sixth lens at the optical axis.

8. The optical lens according to claim 1, characterized in that: The optical lens satisfies the relationship: -2 < F1 / F < -1, and / or, 2 < |F2 / F| < 7, and / or, 1.5 < F3 / F < 3.9, and / or, 1.2 < F4 / F < 1.6, and / or, -1.5 < F5 / F < -0.9, and / or, 1 < F6 / F < 5; Among them, F is the focal length of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, and F6 is the focal length of the sixth lens.

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

10. A terminal device, characterized in that: It comprises a fixing part and a camera module as claimed in claim 9, wherein the camera module is arranged on the fixing part.

Images