Optical lenses, camera modules and terminal equipment

Abstract

The present invention discloses an optical lens, an imaging module and a terminal device. The optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has a negative refractive power, the second lens has a refractive power, the third lens has a positive refractive power, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, and the sixth lens has a positive refractive power. The optical lens satisfies the following relationship: 1.5 < TTL / CTAL < 2.2, where 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 CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis. The optical lens provided by the present invention can achieve a thin, light and miniaturized design of the optical lens while having high imaging quality.

Description

Technical Field

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

[0002] With the development of the automotive industry, camera modules are widely used in various automotive systems (such as Advanced Driving Assistance Systems, dashcams, and reversing cameras) to provide drivers with a better driving experience and achieve functions such as autonomous driving and monitoring. However, with the trend of miniaturization of optical lenses, it is difficult to simultaneously meet people's requirements for high-definition imaging. Summary of the Invention

[0003] This invention discloses an optical lens, a camera module, and a terminal device, which can achieve a thin, light, and miniaturized optical lens while maintaining high imaging quality.

[0004] To achieve the above objectives, in a first aspect, the present invention discloses an optical lens comprising six lenses with refractive power, arranged sequentially along the optical axis from the object side to the image side:

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

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

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

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

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

[0010] The sixth lens has positive refractive power, and the object-side surface of the sixth lens 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] Where, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, i.e., the total 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 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 angle range of the optical lens, thereby obtaining the characteristic of a large field 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 the 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 is configured with both the object side and the image side being convex near the optical axis, further strengthening 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 a sufficient space, effectively shortening the total optical length of the optical lens, making the overall structure of the optical lens more compact, and achieving the miniaturization and thinness design of the optical lens.

[0016] In addition, the optical lens satisfies 105deg < FOV < 130deg. By reasonably configuring the maximum field angle of the optical lens, the optical lens has a large field 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, the imaging module includes an image sensor and the optical lens as described in the first aspect above, and the image sensor is disposed on the image side of the optical lens. The imaging module with this optical lens can achieve the thin and miniaturized design while having high imaging quality.

[0018] Thirdly, the present invention discloses a terminal device, which includes a fixing member and a camera module as described in the second aspect above, the camera module being disposed on the fixing member. The terminal device having this camera module can achieve a thin, light, and miniaturized design while possessing high imaging quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

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

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

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

[0028] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of the present invention;

[0029] Figure 10 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical lens disclosed in the fifth embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the camera module disclosed in this invention;

[0031] Figure 12 This is a schematic diagram of the structure of the device terminal disclosed in this invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In a first aspect, the present invention discloses an optical lens comprising six lenses with refractive power, arranged sequentially from the object side to the image side along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. During imaging, light rays sequentially enter the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens from the object side of the first lens, and are ultimately imaged onto the imaging plane of the optical lens.

[0034] Furthermore, the first lens has negative refractive power, the second lens has positive 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] Furthermore, the object-side surface of the first lens is convex, concave, or flat near the optical axis, and the image-side surface of the first lens is concave near the optical axis; the object-side surface of the second lens is convex or concave near the optical axis, and the image-side surface of the second lens is convex near the optical axis; the object-side surface of the third lens is convex or concave near the optical axis, and the image-side surface of the third lens is convex near the optical axis; the object-side surface of the fourth lens is convex near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis; the object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is convex or concave near the optical axis; the object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is convex or concave near the optical axis.

[0036] By designing the first lens to have negative refractive power and a concave image-side surface near the optical axis, it facilitates the entry of large-angle incident light rays into the optical lens, expanding the field of view and thus achieving a wide field of view. The second lens, with its convex image-side surface near the optical axis, allows incident light rays from the first lens to enter the optical lens more smoothly, helping to correct field curvature and astigmatism, enhancing the stability of the optical lens's imaging effect, and thus improving the image quality. When light enters the third lens, which has positive refractive power, the convex image-side surface of the third lens near the optical axis further enhances the image quality of the first and second lenses. The light collected by the lens is compressed, resulting in a smooth transition of incident light, thereby improving the relative illumination of the optical lens; the fourth lens has positive refractive power, and its configuration, with both the object-side and image-side surfaces being convex near the optical axis, further enhances the convergence of light rays in the central and peripheral fields of view, thus facilitating the miniaturization design of the optical lens; the fifth lens has negative refractive power, and its object-side surface is concave near the optical axis, which helps correct aberrations generated in the third and fourth lenses, improving the image quality of the optical lens; the sixth lens has positive refractive power, and its object-side surface is convex near the optical axis, which helps suppress the deflection angle of the principal ray of the optical lens, reducing the risk of vignetting.

[0037] Furthermore, in some embodiments, all lenses are made of glass to ensure good optical performance while reducing the lens's temperature drift sensitivity. In other embodiments, all lenses are made of plastic to reduce the lens's weight and cost. Alternatively, it can be understood that the specific materials of the lenses can be selected according to actual needs; for example, all lenses may be made of plastic, all of them of glass, or a mixture of different materials may be used to achieve both low temperature drift sensitivity and a lighter overall weight. No specific limitations are imposed here.

[0038] In some embodiments, spherical lenses are considered to have the advantages of simple manufacturing process and low production cost, and they allow for flexible design of lens surface shape, thus improving the imaging resolution of optical lenses. Aspherical lenses allow for more flexible design of the object-side or image-side of the lens, enabling the lens to effectively solve problems such as unclear imaging, distorted field of view, or narrow field of view even when the lens is small and thin. Furthermore, the optical lens does not need to incorporate too many lenses to achieve good image quality, which is beneficial for shortening the length of the optical lens. Based on this, the first, second, third, fourth, and fifth lenses can be spherical lenses, while the sixth lens is an aspherical lens. This combination of spherical and aspherical lenses not only improves the manufacturability of each lens and facilitates surface shape design, but also allows for more flexible design of the object-side or image-side of the lens. This allows each lens to effectively solve problems such as unclear imaging, distorted field of view, or narrow field of view even when the lens is small and thin, and the optical lens does not need to incorporate too many lenses to achieve good image quality, which is beneficial for shortening the length of the optical lens. It is understood that in other embodiments, the surfaces of each lens in the optical lens can be spherical, aspherical, or any combination of spherical and aspherical surfaces. The specific choice can be made according to actual needs, so no specific limitation is made in this embodiment.

[0039] In some embodiments, the optical lens further includes an aperture stop, which can be an aperture stop and / or a field stop. For example, the aperture stop can be an aperture stop, or a field stop, or both an aperture stop and a field stop. By placing the aperture 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 plane. This reduces the effective diameter of the optical lens without reducing its telecentricity, thereby achieving miniaturization. It is understood that in other embodiments, the aperture stop can also be placed between other lenses, and the setting can be adjusted according to the actual situation. This embodiment does not specifically limit this.

[0040] In some embodiments, the optical lens further includes an infrared filter disposed between the sixth lens and the imaging plane of the optical lens. Optionally, the infrared filter may be an infrared cut-off filter to filter out infrared light and allow visible light to pass through, making the image more consistent with the visual experience of the human eye, thereby improving image quality. In other embodiments, the infrared filter may be an infrared bandpass filter to allow infrared light to pass through and reflect visible light, thereby achieving infrared imaging of the optical lens, enabling the optical lens to image in low-light environments or special application scenarios and obtain better image quality. It is understood that the infrared filter may be made of plastic, optical glass with a coating, or other materials, and can be selected according to actual needs; no specific limitation is made 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, so as to protect the image sensor and prevent dust. The protective glass can be made of plastic, or made of optical glass with a coating, or other materials, and can be selected according to actual needs, and is not specifically limited in this embodiment. It can be understood that the protective glass can be part of the optical lens or can be 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. Where 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 overall optical length of each lens, it is beneficial to the injection molding and assembly of each lens, improving the assembly yield rate of the optical lens. At the same time, each lens can perform surface shape changes and arrangements 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 thinness 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. Where 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 obtain more scene content, and thus enriches the imaging information of the optical lens.

[0046] In some embodiments, the optical lens further includes an aperture 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. Where EDS is the maximum effective aperture of the aperture, 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, aperture diameter and 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 details of the photographed object well.

[0048] In some embodiments, the optical lens satisfies the relation: 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 resolution of the optical lens.

[0050] In some embodiments, the fourth lens and the fifth lens are cemented, and a positive-negative refractive power configuration 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 relation: 3.3 < SD6 / CT34 < 22.6. Wherein, SD6 is half of the maximum effective clear 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 is not 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 relation: |SD1*SAGS1| < 2.5mm 2 . Wherein, SD1 is half of the maximum effective clear 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 the size of the optical lens in the direction perpendicular to the optical axis being too large, which is not conducive to the miniaturization of the optical lens.

[0055] In some embodiments, the optical lens satisfies the relation: -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, a negative refractive power is provided for the optical lens, which is beneficial to expanding 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, so that the large-angle light can 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 all the optical information from the object space to the image space provided by the first lens for each lens can be captured, 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 relational expression, 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 the weight of the first lens to be relatively large, 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 relational expressions: 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 of each lens to the thickness on the optical axis, the tolerance sensitivity of the thickness of each lens on the optical axis in the optical lens can be reduced, thereby reducing the processing technology difficulty of each lens and improving the assembly yield of the optical lens to reduce the production cost.

[0059] In some embodiments, the optical lens satisfies the relational expression: |R12 / R11| < 5.8. Further, the optical lens may satisfy the relational expression: 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, improving the imaging quality of the optical lens. At the same time, it is also beneficial for the sixth lens to effectively correct the aberration of the optical lens. In addition, while enabling the sixth lens to meet the requirements of optical performance, it is also beneficial for the surface shape of the sixth lens not to be too curved, which is conducive 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 relational expressions: -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. Where 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 performance is good.

[0063] In some embodiments, the optical lens satisfies the relational expression: 4.5 < TTL / F < 5.5. Where 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, while the optical lens meets a sufficient field angle range, the overall length of the optical lens can be controlled, which is beneficial for the miniaturization design of the optical lens. When below the lower limit of the relational expression, the focal length of the optical lens is too long, which is not conducive to meeting the field 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 relational expression, 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 relational expression: 4.5mm*10 -6 / ℃ < (CT4 - CT5)*(α4 - α5) < 10.5mm*10 -6 / ℃. Where CT4 is the thickness of the fourth lens along the optical axis, CT5 is the thickness of the fifth lens along the optical axis, α4 is the coefficient of thermal expansion of the fourth lens under conditions of 30℃~70℃, and α5 is the coefficient of thermal expansion of the fifth lens under conditions of 30℃~70℃, with units of 10. -6 / ℃.

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

[0067] The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0068]

[0069] Where 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 vertex of the aspherical surface, c = 1 / Y, Y is the radius of curvature (i.e., the paraxial curvature c is the reciprocal of the radius of Y in Table 1), k is the conic constant, and Ai is the coefficient corresponding to the i-th higher-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] A schematic diagram of the structure of the optical lens 100 disclosed in the first embodiment of the present invention is shown below. Figure 1 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can be found in the specific embodiments described above, and 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] Furthermore, the object-side surface S1 of the first lens is convex near the optical axis O, and the image-side surface S2 of the first lens is concave near the optical axis O; the object-side surface S3 of the second lens is concave near the optical axis O, and the image-side surface S4 of the second lens is convex near the optical axis O; the object-side surface S5 of the third lens is convex near the optical axis O, and the image-side surface S6 of the third lens is convex near the optical axis O; the object-side surface S7 of the fourth lens is convex near the optical axis O, and the image-side surface S8 of the fourth lens is convex near the optical axis O; the object-side surface S9 of the fifth lens is concave near the optical axis O, and the image-side surface S10 of the fifth lens is convex near the optical axis O; the object-side surface S11 of the sixth lens is convex near the optical axis O, and the image-side surface S12 of the sixth lens is concave near the optical axis O.

[0075] Specifically, taking an optical lens 100 with a focal length F = 3.45 mm, an aperture number FNO = 2, a maximum field of view (FOV) of 118.22 degrees, and an optical length (TTL) of 17.1 mm as an example, other parameters of the optical lens 100 are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are arranged sequentially according to the order of the elements in Table 1 from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and the image side S2 of the first lens, respectively. The Y-radius in Table 1 is the radius of curvature of the corresponding object side or image side 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 stop STO in the "Thickness" parameter column represents the distance from the stop 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 this value is negative, it indicates that the stop STO is set on the image side of the vertex of the next surface. If the thickness of the stop STO is positive, the stop STO is on the object side of the vertex of the next surface. It can be understood that the units of Y radius, thickness, and focal length in Table 1 are all mm, and the refractive index, Abbe number, and focal length in Table 1 are all obtained at a reference wavelength of 587.56 nm.

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

[0077] Table 1

[0078]

[0079] Table 2

[0080]

[0081] Please see Figure 2 (A) in the middle Figure 2 Figure (A) in section 2 shows the longitudinal spherical aberration diagrams 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. 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. As can be seen from Figure (A) in section 2, the spherical aberration values ​​of the optical lens 100 in the first embodiment are better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0082] Please see Figure 2 (B) in the middle Figure 2 Figure (B) shows an 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 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 plane IMG in the meridional direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. Figure 2 As can be seen from (B) in the figure, the astigmatism of the optical lens 100 is well compensated at this wavelength.

[0083] Please see Figure 2 (C) in the middle, Figure 2 Figure (C) shows the 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 represents distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 2 As can be seen from (C), the distortion of the optical lens 100 is well corrected at this wavelength.

[0084] Second Embodiment

[0085] The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of this application is shown below. Figure 3 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated 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] Furthermore, the object-side surface S1 of the first lens is flat near the optical axis O, and the image-side surface S2 of the first lens is concave near the optical axis O; the object-side surface S3 of the second lens is concave near the optical axis O, and the image-side surface S4 of the second lens is convex near the optical axis O; the object-side surface S5 of the third lens is convex near the optical axis O, and the image-side surface S6 of the third lens is convex near the optical axis O; the object-side surface S7 of the fourth lens is convex near the optical axis O, and the image-side surface S8 of the fourth lens is convex near the optical axis O; the object-side surface S9 of the fifth lens is concave near the optical axis O, and the image-side surface S10 of the fifth lens is concave near the optical axis O; the object-side surface S11 of the sixth lens is convex near the optical axis O, and the image-side surface S12 of the sixth lens is convex near the optical axis O.

[0088] Specifically, taking the optical lens 100 with a focal length F = 3.46mm, an aperture number FNO = 2, a maximum field of view (FOV) of 118.34deg, and an optical total length (TTL) of 17.101mm as an example. Other parameters in this second embodiment are given in Tables 3 and 4 below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0089] Table 3

[0090]

[0091]

[0092] Table 4

[0093]

[0094] Please see Figure 4 ,Depend on Figure 4 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the second embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content 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 this application is shown below. Figure 5 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated 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] Furthermore, the object-side surface S1 of the first lens is concave near the optical axis O, and the image-side surface S2 of the first lens is concave near the optical axis O; the object-side surface S3 of the second lens is convex near the optical axis O, and the image-side surface S4 of the second lens is convex near the optical axis O; the object-side surface S5 of the third lens is concave near the optical axis O, and the image-side surface S6 of the third lens is convex near the optical axis O; the object-side surface S7 of the fourth lens is convex near the optical axis O, and the image-side surface S8 of the fourth lens is convex near the optical axis O; the object-side surface S9 of the fifth lens is concave near the optical axis O, and the image-side surface S10 of the fifth lens is concave near the optical axis O; the object-side surface S11 of the sixth lens is convex near the optical axis O, and the image-side surface S12 of the sixth lens is convex near the optical axis O.

[0099] Specifically, taking the optical lens 100 with a focal length f = 3.73 mm, an aperture number FNO = 2, a maximum field of view (FOV) of 110 degrees, and an optical total length (TTL) of 16.921 mm as an example. Other parameters in this third embodiment are given in Tables 5 and 6 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here.

[0100] Table 5

[0101]

[0102]

[0103] Table 6

[0104]

[0105] Please see Figure 6 ,Depend on Figure 6 (A) Longitudinal spherical aberration diagram Figure 6 (B) image scatter plot and Figure 6As can be seen from the distortion curve (C) in the third embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content 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 this application is shown below. Figure 7 As shown, the optical lens 100 includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated 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] Furthermore, the object-side surface S1 of the first lens is concave near the optical axis O, and the image-side surface S2 of the first lens is concave near the optical axis O; the object-side surface S3 of the second lens is concave near the optical axis O, and the image-side surface S4 of the second lens is convex near the optical axis O; the object-side surface S5 of the third lens is convex near the optical axis O, and the image-side surface S6 of the third lens is convex near the optical axis O; the object-side surface S7 of the fourth lens is convex near the optical axis O, and the image-side surface S8 of the fourth lens is convex near the optical axis O; the object-side surface S9 of the fifth lens is concave near the optical axis O, and the image-side surface S10 of the fifth lens is concave near the optical axis O; the object-side surface S11 of the sixth lens is convex near the optical axis O, and the image-side surface S12 of the sixth lens is convex near the optical axis O.

[0110] Specifically, taking the optical lens 100 with a focal length F = 3.467mm, an aperture number FNO = 2, a maximum field of view (FOV) of 118.2deg, and an optical total length (TTL) of 17.1mm as an example. Other parameters in this fourth embodiment are given in Tables 7 and 8 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here.

[0111] Table 7

[0112]

[0113] Table 8

[0114]

[0115] Please see Figure 8 ,Depend on Figure 8 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the fourth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content 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 this application is shown below. Figure 9 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated 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] Furthermore, the object-side surface S1 of the first lens is convex near the optical axis O, and the image-side surface S2 of the first lens is concave near the optical axis O; the object-side surface S3 of the second lens is concave near the optical axis O, and the image-side surface S4 of the second lens is convex near the optical axis O; the object-side surface S5 of the third lens is convex near the optical axis O, and the image-side surface S6 of the third lens is convex near the optical axis O; the object-side surface S7 of the fourth lens is convex near the optical axis O, and the image-side surface S8 of the fourth lens is convex near the optical axis O; the object-side surface S9 of the fifth lens is concave near the optical axis O, and the image-side surface S10 of the fifth lens is concave near the optical axis O; the object-side surface S11 of the sixth lens is convex near the optical axis O, and the image-side surface S12 of the sixth lens is convex near the optical axis O.

[0120] Specifically, taking the optical lens 100 with a focal length F = 3.25mm, an aperture number FNO = 2, a maximum field of view (FOV) of 116deg, and an optical total length (TTL) of 17.106mm as an example. Other parameters in this fifth embodiment are given in Tables 9 and 10 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here.

[0121] Table 9

[0122]

[0123] Table 10

[0124]

[0125]

[0126] Please see Figure 10 ,Depend on Figure 10 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the fifth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 10 (A) Figure 10 (B) and Figure 10 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0127] Please refer to Table 11, which summarizes the ratios of the various relationships in the first to fifth embodiments of this application.

[0128] Table 11

[0129]

[0130] Please see Figure 11Secondly, this application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any of the first to fifth embodiments of the first aspect above. The image sensor 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the subject and project it onto the image sensor 201. The image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. It can be understood that the camera module 200 with the optical lens 100 can achieve a thin, light, and miniaturized design while having high imaging quality.

[0131] Please see Figure 12 Thirdly, this application also discloses a terminal device 400, which includes a housing 401 and a camera module 200 as described in the second aspect above, the camera module 200 being disposed in the housing 401. The terminal device 400 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, dashcam, reversing camera, etc. It is understood that the terminal device 400 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical lens, namely, it can achieve a thin, lightweight, and miniaturized design while maintaining high imaging quality.

[0132] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

[0133] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, There are a total of six lenses with refractive power, which successively include, from the object side to the image side along the optical axis: The first lens, having negative refractive power, and the image side of the first lens is concave near the optical axis; The second lens, having refractive power, and the image side of the second lens is convex near the optical axis; The third lens, having positive refractive power, and the image side of the third lens is convex near the optical axis; The fourth lens, having 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, having negative refractive power, and the object side of the fifth lens is concave near the optical axis; The sixth lens, having positive refractive power, and the object side of the sixth lens is convex near the optical axis; The optical lens further includes an aperture stop, and the aperture stop 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 following relationships: 1.5 < TTL / CTAL < 2.2; 105deg < FOV < 130deg; -8.7 < EDS*TAN(FOV) / F < -6.2; Where, 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, FOV is the maximum field angle of the optical lens, EDS is the maximum effective aperture of the aperture stop, and F is the focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relationship: [[ID= ​ 3. The optical lens according to claim 1, characterized in that, ​ ​ ​ 4. The optical lens according to claim 1, characterized in that, ​ |SD1*SAGS1|<2.5mm 2 ; ​ 5. The optical lens according to claim 1, characterized in that, ​ ​ ​ 6. The optical lens according to claim 1, characterized in that, ​ ​ ​ 7. The optical lens according to claim 1, characterized in that, ​ ​ Wherein, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, 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.

8. A camera module, characterized in that, It includes an image sensor and an optical lens as described in any one of claims 1-7, wherein the image sensor is disposed on the image side of the optical lens.

9. A terminal device, characterized in that, It includes a fixing member and a camera module as described in claim 8, wherein the camera module is disposed on the fixing member.

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