A large-aperture, high-pixel and ultra-thin imaging lens

Abstract

The present invention relates to a large-aperture, high-pixel, ultra-thin imaging lens, which sequentially includes, from the object side to the image side: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The imaging lens satisfies the relational expressions: -0.27 ≤ SD31 - SD12 ≤ 0; 1.94 ≤ IMGH / FNO ≤ 2.16; where SD31 is the effective radius of the object-side surface of the third lens, SD12 is the effective radius of the image-side surface of the first lens, IMGH is the maximum image height of the imaging lens, and FNO is the aperture number of the imaging lens. The present invention can maintain high imaging quality while effectively shortening the system length and increasing the pixel count, so as to be used in small portable electronic devices that require high-order imaging quality.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and more particularly, to a large-aperture, high-pixel, ultra-thin imaging lens. Background Art

[0002] With the rapid development of technology, especially electronic technology, mobile and portable electronic devices have been rapidly popularized, driving the rapid development of related technologies for imaging modules applied to electronic devices. Imaging modules have been increasingly widely used, such as in smartphones, tablet computers, dash cams, and action cameras. The trend of thinner and lighter electronic products such as smartphones has also increased the demand for miniaturization of imaging modules. With the improvement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced, and the length of the optical imaging lens installed in the imaging module also needs to be correspondingly shortened. Traditional thin and light optical imaging lenses mostly adopt four-piece or five-piece lens structures, but the four-piece and five-piece lens structures have limitations in terms of refractive power distribution, aberration and astigmatism correction, and sensitivity distribution, and cannot further meet the imaging requirements of large aperture and high pixels. Therefore, how to effectively compress the total length of the optical imaging lens while taking into account good imaging quality is an urgent problem to be solved by those skilled in the art.

[0003] On the other hand, with the continuous improvement of mobile phone design and process level, more and more mobile phone terminal devices use ultra-narrow bezels, borderless or even full-screen designs. Especially the full-screen design, which has a large screen-to-body ratio and gives consumers a great visual impact, has become a major selling point for terminal manufacturers. Therefore, an optical imaging lens with a small head and high pixels is needed to meet the structural requirements of full-screen mobile phones. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-aperture, high-pixel, ultra-thin imaging lens, which can effectively shorten the system length and improve the pixels while maintaining high imaging quality, so as to be used in small portable electronic devices that require high-order imaging quality.

[0005] A large-aperture, high-pixel, ultra-thin imaging lens, which sequentially includes, from the object side to the image side: a diaphragm; a first lens with positive refractive power, the object-side surface of which is convex near the optical axis and the image-side surface of which is concave near the optical axis; a second lens with negative refractive power, the object-side surface of which is convex near the optical axis and the image-side surface of which is concave near the optical axis; a third lens with positive refractive power, the object-side surface of which is convex near the optical axis; a fourth lens with negative refractive power, the object-side surface of which is concave near the optical axis and the image-side surface of which is concave near the optical axis; a fifth lens with positive refractive power, the object-side surface of which is convex near the optical axis and the image-side surface of which is convex near the optical axis; and a sixth lens with negative refractive power, the object-side surface of which is concave near the optical axis and the image-side surface of which is concave near the optical axis, and the image-side surface of which has at least one inflection point; the imaging lens satisfies the relational expression:

[0006] -0.27 ≤ SD31 - SD12 ≤ 0;

[0007] 1.94 ≤ IMGH / FNO ≤ 2.16;

[0008] Wherein, SD31 is the effective radius of the object-side surface of the third lens, SD12 is the effective radius of the image-side surface of the first lens, IMGH is the maximum image height of the imaging lens, and FNO is the aperture number of the imaging lens.

[0009] Further, the imaging lens satisfies the relational expression: f / EPD ≤ 1.79; wherein, f is the focal length of the lens group and EPD is the entrance pupil diameter.

[0010] Further, the imaging lens satisfies the relational expression: 0.44 ≤ CT1 - CT2 ≤ 0.75; wherein, CT1 is the thickness of the first lens on the optical axis and CT2 is the thickness of the second lens on the optical axis.

[0011] Further, the imaging lens satisfies the relational expression: 2.5 < EPD / BL; wherein, EPD is the entrance pupil diameter and BL is the distance from the image-side surface of the sixth lens to the imaging plane.

[0012] Further, the imaging lens satisfies the relational expression: 1.29 < TTL / IMGH < 1.5; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane, and IMGH is the maximum image height of the imaging lens.

[0013] Further, the imaging lens satisfies the relational expression: -0.81 < (R12 + R13) / (R12 - R13) < -0.42; wherein, R12 is the radius of curvature of the object-side surface of the sixth lens and R13 is the radius of curvature of the image-side surface of the sixth lens.

[0014] Further, the imaging lens satisfies the relational expression: 0.87 < Yc62 / f < 152; where Yc62 is the vertical distance between the anti - curvature point closest to the optical axis on the image - side surface of the sixth lens and the optical axis, and f is the focal length of the lens group.

[0015] Further, the imaging lens satisfies the relational expression: 0.78 < f2 / f < 0.91; where f2 is the focal length of the second lens, and f is the focal length of the lens group.

[0016] Further, the imaging lens satisfies the relational expression: 0.64 < ACT / ALT < 0.7; where ACT is the total thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, and ALT is the distance on the optical axis from the object - side surface of the first lens to the image - side surface of the sixth lens.

[0017] Further, the object - side surfaces and image - side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical surfaces.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: adopting a six - lens structure and cooperating with the bending force combination of positive - negative - positive - negative - positive - negative enables the lens to have better light - converging ability. While meeting the requirements of high pixels, it effectively reduces the total length of the camera lens system group, achieving thin and light. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the large - aperture high - pixel ultra - thin imaging lens according to the first embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the vertical distance between the anti - curvature point closest to the optical axis on the image - side surface of the sixth lens and the optical axis.

[0021] Figure 3 It is an astigmatism and distortion curve diagram of the first embodiment of the present invention.

[0022] Figure 4 It is a spherical aberration curve diagram of the first embodiment of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the large - aperture high - pixel ultra - thin imaging lens according to the second embodiment of the present invention.

[0024] Figure 6 It is an astigmatism and distortion curve diagram of the second embodiment of the present invention.

[0025] Figure 7 It is a spherical aberration curve diagram of the second embodiment of the present invention.

[0026] Figure 8Schematic diagram of the structure of the large-aperture, high-pixel and ultra-thin imaging lens according to the third embodiment of the present invention.

[0027] Figure 9 Astigmatism and distortion curve graphs of the third embodiment of the present invention.

[0028] Figure 10 Spherical aberration curve graph of the third embodiment of the present invention.

[0029] Figure 11 Schematic diagram of the structure of the large-aperture, high-pixel and ultra-thin imaging lens according to the fourth embodiment of the present invention.

[0030] Figure 12 Astigmatism and distortion curve graphs of the fourth embodiment of the present invention.

[0031] Figure 13 Spherical aberration curve graph of the fourth embodiment of the present invention.

[0032] Figure 14 Schematic diagram of the structure of the large-aperture, high-pixel and ultra-thin imaging lens according to the fifth embodiment of the present invention.

[0033] Figure 15 Astigmatism and distortion curve graphs of the fifth embodiment of the present invention.

[0034] Figure 16 Spherical aberration curve graph of the fifth embodiment of the present invention.

[0035] Figure 17 Schematic diagram of the structure of the large-aperture, high-pixel and ultra-thin imaging lens according to the sixth embodiment of the present invention.

[0036] Figure 18 Astigmatism and distortion curve graphs of the sixth embodiment of the present invention.

[0037] Figure 19 Spherical aberration curve graph of the sixth embodiment of the present invention. Detailed implementation manners

[0038] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0039] In the description of the present invention, the object side refers to the side of the lens facing the object to be photographed, and the image side refers to the side of the lens facing the imaging surface. When a tangent plane is made at any point on the surface passing through the object side surface of the lens, the object side surface is always located on the image side of the tangent plane, and its radius of curvature is positive, then the object side surface of the lens is a convex surface; otherwise, the object side surface of the lens is a concave surface.

[0040] When a tangent plane is made at any point on the surface passing through the image side surface of the lens, the image side surface is always on the object side of the tangent plane, and its radius of curvature is negative, so the image side surface of the lens is a convex surface; otherwise, the image side surface of the lens is a concave surface.

[0041] If a tangent plane is made at any point on the surface passing through the object side surface or the image side surface of the lens, and the surface has part on the image side of the tangent plane and part on the object side of the tangent plane, then there is an inflection point on this surface. The judgment of the convexity and concavity of the object side and image side surfaces near the optical axis still applies the above method.

[0042] In addition, the aspheric curve equations of each lens are expressed as follows:

[0043]

[0044] Among them, Z is the distance sag from the origin of the aspheric surface when the aspheric surface is at a position with a height of r along the optical axis direction, c is the paraxial curvature of the aspheric surface (the radius of curvature R = 1 / c, that is, the reciprocal of the curvature); k is the conic coefficient; Ai is the i-th order coefficient of the aspheric surface. The high-order coefficients applied in the present invention are A4, A6, A8, A10, A12, A14, A16, A18, A20.

[0045] As Figure 1 and Figure 2 shown, in the first embodiment, the large-aperture high-pixel ultra-thin imaging lens of the present invention sequentially includes a diaphragm 10, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a filter 17 from the object side to the image side. Among them, the object side surfaces and image side surfaces of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are all aspheric surfaces.

[0046] The first lens 11 has a positive refractive power. Its object side surface is convex near the optical axis, and its image side surface is concave near the optical axis. The second lens 12 has a negative refractive power. Its object side surface is convex near the optical axis, and its image side surface is concave near the optical axis. The third lens 13 has a positive refractive power. Its object side surface is convex near the optical axis. The fourth lens 14 has a negative refractive power. Its object side surface is concave near the optical axis, and its image side surface is concave near the optical axis. The fifth lens 15 has a positive refractive power. Its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis. The sixth lens 16 has a negative refractive power. Its object side surface is concave near the optical axis, and its image side surface is concave near the optical axis, and its image side surface has at least one inflection point.

[0047] In the above structure, the object-side surface of the first lens 11 is convex, and a positive refractive power configuration is adopted, thereby strengthening and shortening the total optical length; the image-side surface of the first lens 11 is concave near the optical axis, which can effectively balance the low-order aberrations. The second lens 12 has a negative refractive power, which is beneficial to eliminating the aberrations generated by the first lens 11. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis, which helps to strengthen the correction of paraxial spherical aberration and off-axis aberration, and correct its image capture. The object-side surface of the third lens 13 is convex near the optical axis, which can effectively correct the paraxial spherical aberration and at the same time reduce the astigmatic field curvature at the periphery. The fourth lens 14 has a negative refractive power, and its object-side and image-side surfaces are double-concave structures, which helps to strengthen the correction of astigmatism, correct the coma of the off-axis field of view, and at the same time effectively reduce the tolerance sensitivity of the off-axis field of view of the system. The fifth lens 15 has a positive refractive power, and its object-side and image-side surfaces are double-convex structures, which helps to synthesize the refractive powers of the first four lenses, avoid concentrating on the fifth lens 15, and reduce the excessive bending of the lens due to the too large curvature at the periphery of the lens, thereby reducing the problem of poor molding. In addition, the structure of the fifth lens 15 helps to strengthen the correction of the coma of the off-axis field of view, and at the same time converges the field curvature well to improve the imaging quality and reduce the tolerance sensitivity of the system. The sixth lens 16 has a negative refractive power, and its image-side surface is concave near the optical axis, which helps to move the principal point of the optical imaging system away from the image-side end, thereby effectively shortening the overall length of the optical imaging system, being beneficial to the miniaturization of the system, and at the same time correcting the off-axis aberration to improve the peripheral imaging quality.

[0048] In the above structure, with reasonable material selection and refractive power matching, when specific conditions are met, the entire optical system has better light-gathering ability, meets the requirements of high pixels, and at the same time effectively reduces the total length of the camera lens system group, achieving thinness and lightness.

[0049] The imaging lens satisfies the relationship: -0.27 ≤ SD31 - SD12 ≤ 0. Wherein, SD31 is the effective radius of the object-side surface of the third lens 13, and SD12 is the effective radius of the image-side surface of the first lens 11. As a preferred embodiment, the imaging lens can further satisfy: -0.25 ≤ SD31 - SD12 ≤ -0.22, so that the head of the lens is miniaturized to meet the structural requirements of a full-screen mobile phone. If it exceeds the upper limit, the head of the lens will be too large, not meeting the narrow forehead design standard of the full screen. If it exceeds the upper limit, aberrations such as astigmatism and spherical aberration of the lens will become worse and cannot meet the imaging quality requirements.

[0050] The imaging lens also satisfies the relationship: 1.94 ≤ IMGH / FNO ≤ 2.16, thereby ensuring a large image height of the system to ensure high pixels and being compatible with multiple chips such as 48M, 32M, and 24M. At the same time, it ensures that the system has a large light-gathering aperture, the lens can obtain sufficient effective light input, improves the signal-to-noise ratio of the optical system, and is beneficial to shooting in a dark environment at night.

[0051] Preferably, the imaging lens satisfies the condition f / EPD ≤ 1.79, where f is the focal length of the lens group and EPD is the entrance pupil diameter. The reciprocal of the relative aperture of the optical imaging lens is less than 1.79, which can ensure that the lens can obtain sufficient effective light input, improve the signal-to-noise ratio of the optical system, and is beneficial to shooting in a dark environment at night.

[0052] Preferably, the imaging lens satisfies the condition 0.44 ≤ CT1 - CT2 ≤ 0.75, where CT1 is the thickness of the first lens 11 on the optical axis and CT2 is the thickness of the second lens 12 on the optical axis, thereby effectively controlling the lens thickness difference, ensuring that the proportion of poor assembly caused by excessive thickness difference during the lens assembly process is not too high, and at the same time avoiding deformation caused by uneven cooling after the lens is formed due to the excessive thickness of the first lens 11, or uneven filling of the plastic material during the lens forming due to the too thin thickness of the second lens 12.

[0053] Preferably, the imaging lens satisfies the condition 2.5 < EPD / BL, where EPD is the entrance pupil diameter and BL is the distance from the image side surface of the sixth lens 16 to the imaging surface, so as to obtain a shorter back focal length under the configuration of a large aperture, in order to further miniaturize the imaging lens group.

[0054] Preferably, the imaging lens satisfies the condition 1.29 < TTL / IMGH < 1.5, where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis and IMGH is the maximum image height of the imaging lens. Meeting the above conditions can control the ratio of the total length of the optical imaging lens to the maximum image height of the imaging surface, so that the optical imaging lens can meet the miniaturization as much as possible while meeting the conditions of high pixels.

[0055] Preferably, the imaging lens satisfies the condition -0.81 < (R12 + R13) / (R12 - R13) < -0.42, where R12 is the curvature radius of the object side surface of the sixth lens 16 and R13 is the curvature radius of the image side surface of the sixth lens 16. The above conditions can adjust the surface shape of the image side surface of the sixth lens 16 near the optical axis, slow down the shape change of the sixth lens 16, reduce the generation of stray light, improve the formability of the lens, and at the same time effectively correct the off-axis aberration of the system.

[0056] Preferably, the imaging lens satisfies the condition 0.87 < Yc62 / f < 1.52, where Yc62 is the vertical distance between the inflection point closest to the optical axis on the image side surface of the sixth lens 16 and the optical axis, and f is the focal length of the lens group, thereby suppressing the angle of off-axis light incident on the imaging surface, facilitating the control of the peripheral light angle, correcting the off-axis aberration, and at the same time maintaining sufficient imaging height and image capture range.

[0057] Preferably, the imaging lens satisfies the condition 0.78 < f1 / f < 0.91, where f1 is the focal length of the first lens 11 and f is the focal length of the lens group, so as to reconcile the refractive power ratio of the first lens 11 and the lens group, and avoid the situation that the refractive power ratio of the first lens 11 is too large, resulting in too high sensitivity of the first lens 11 and thus reducing the manufacturing yield.

[0058] Preferably, the imaging lens satisfies the condition 0.64 < ACT / ALT < 0.7, where ACT is the total thickness of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15 and the sixth lens 16 on the optical axis, and ALT is the distance on the optical axis from the object side surface of the first lens 11 to the image side surface of the sixth lens 16. Satisfying this condition can appropriately adjust the thickness of the lens, which is helpful for lens manufacturing and molding, can improve the manufacturing yield, and meeting the set range of the conditional formula helps to shorten the total length of the optical imaging system group and maintain its miniaturization for application in portable electronic products.

[0059] The imaging lens of the present invention will be described in detail through the following specific embodiments in conjunction with the accompanying drawings.

[0060] For the first embodiment, please refer to Figure 3 and Figure 4 . In the first embodiment, the imaging lens satisfies Table 1-1, Table 1-2 and Table 1-3.

[0061] Table 1-1 shows the basic parameters of the optical lens in the first embodiment:

[0062]

[0063] Table 1-2 shows the aspheric coefficients of each lens in the first embodiment:

[0064]

[0065]

[0066] Table 1-3 shows the values of each conditional expression in the first embodiment:

[0067]

[0068] For the second embodiment, please refer to Figure 5 , Figure 6 and Figure 7, the large-aperture, high-pixel and ultra-thin imaging lens of the present invention sequentially includes a diaphragm 20, a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a filter 27 from the object side to the image side. Among them, the object-side surface and the image-side surface of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, and the sixth lens 26 are all aspherical surfaces. In the second embodiment, the imaging lens satisfies Table 2-1, Table 2-2, and Table 2-3.

[0069] Table 2-1 shows the basic parameters of the optical lens in the second embodiment:

[0070]

[0071] Table 2-2 shows the aspherical coefficients of each lens in the second embodiment:

[0072]

[0073]

[0074] Table 2-3 shows the values of each conditional expression in the second embodiment:

[0075]

[0076] For the third embodiment, please refer to Figure 8 , Figure 9 and Figure 10 , in the third embodiment, the large-aperture, high-pixel and ultra-thin imaging lens of the present invention sequentially includes a diaphragm 30, a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, a sixth lens 36, and a filter 37 from the object side to the image side. Among them, the object-side surface and the image-side surface of the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35, and the sixth lens 36 are all aspherical surfaces. The imaging lens satisfies Table 3-1, Table 3-2, and Table 3-3.

[0077] Table 3-1 shows the basic parameters of the optical lens in the third embodiment:

[0078]

[0079]

[0080] Table 3-2 shows the aspherical coefficients of each lens in the third embodiment:

[0081]

[0082] Table 3-3 shows the values of each conditional expression in the third embodiment:

[0083]

[0084]

[0085] The fourth embodiment. Please refer to Figure 11 、 Figure 12 and Figure 13 In the fourth embodiment, the large-aperture, high-pixel, ultra-thin imaging lens of the present invention sequentially includes a diaphragm 40, a first lens 41, a second lens 42, a third lens 43, a fourth lens 44, a fifth lens 45, a sixth lens 46, and a filter 47 from the object side to the image side. Among them, the object-side surface and the image-side surface of the first lens 41, the second lens 42, the third lens 43, the fourth lens 44, the fifth lens 45, and the sixth lens 46 are all aspherical surfaces. The imaging lens satisfies Table 4-1, Table 4-2, and Table 4-3.

[0086] Table 4-1 shows the basic parameters of the optical lens in the fourth embodiment:

[0087]

[0088] Table 4-2 shows the aspherical coefficients of each lens in the fourth embodiment:

[0089]

[0090]

[0091] Table 4-3 shows the values of each conditional expression in the fourth embodiment:

[0092]

[0093] The fifth embodiment. Please refer to Figure 14 、 Figure 15 and Figure 16 In the fifth embodiment (the first embodiment in the original text seems to be a misstatement, assuming it should be the fifth embodiment), the large-aperture, high-pixel, ultra-thin imaging lens of the present invention sequentially includes a diaphragm 50, a first lens 51, a second lens 52, a third lens 53, a fourth lens 54, a fifth lens 55, a sixth lens 56, and a filter 57 from the object side to the image side. Among them, the object-side surface and the image-side surface of the first lens 51, the second lens 52, the third lens 53, the fourth lens 54, the fifth lens 55, and the sixth lens 56 are all aspherical surfaces. The imaging lens satisfies Table 5-1, Table 5-2, and Table 5-3.

[0094] Table 5-1 shows the basic parameters of the optical lens in the fifth embodiment:

[0095]

[0096]

[0097] Table 5-2 shows the aspherical coefficients of each lens in the fifth embodiment:

[0098]

[0099] Table 5-3 shows the values of each conditional expression in the fifth embodiment:

[0100]

[0101] For the sixth embodiment, please refer to Figure 17 , Figure 18 and Figure 19 . In the sixth embodiment, the large-aperture, high-pixel, ultra-thin imaging lens of the present invention sequentially includes a diaphragm 60, a first lens 61, a second lens 62, a third lens 63, a fourth lens 64, a fifth lens 65, a sixth lens 66, and a filter 67 from the object side to the image side. Among them, the object-side surface and the image-side surface of the first lens 61, the second lens 62, the third lens 63, the fourth lens 64, the fifth lens 65, and the sixth lens 66 are all aspherical. The imaging lens satisfies Table 6-1, Table 6-2, and Table 6-3.

[0102] Table 6-1 shows the basic parameters of the optical lens in the sixth embodiment:

[0103]

[0104] Table 6-2 shows the aspherical coefficients of each lens in the sixth embodiment:

[0105]

[0106]

[0107] Table 6-3 shows the values of each conditional expression in the sixth embodiment:

[0108]

[0109] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0110] Although the description of the present invention is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications, and changes based on the above content. Therefore, all such substitutions, improvements, and changes are included within the spirit and scope of the appended claims.

Claims

1. A large-aperture, high-pixel and ultra-thin imaging lens, characterized in that, From the object side to the image side, it sequentially includes: A diaphragm; A first lens with positive refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis; A second lens with negative refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis; A third lens with positive refractive power, whose object-side surface is convex near the optical axis; A fourth lens with negative refractive power, whose object-side surface is concave near the optical axis and whose image-side surface is concave near the optical axis; A fifth lens with positive refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is convex near the optical axis; and A sixth lens with negative refractive power, whose object-side surface is concave near the optical axis and whose image-side surface is concave near the optical axis, and whose image-side surface has at least one inflection point; The imaging lens satisfies the relationship: -0.27 ≤ SD31 - SD12 ≤ 0; 1.94 ≤ IMGH / FNO ≤ 2.16; Wherein, SD31 is the effective radius of the object-side surface of the third lens, SD12 is the effective radius of the image-side surface of the first lens, IMGH is the maximum image height of the imaging lens, and FNO is the f-number of the imaging lens; The imaging lens satisfies the relationship: 0.78 < f1 / f < 0.91; Wherein, f1 is the focal length of the first lens and f is the focal length of the lens group; The imaging lens satisfies the relationship: -0.81 < (R12 + R13) / (R12 - R13) < -0.42; Wherein, R12 is the curvature radius of the object-side surface of the sixth lens and R13 is the curvature radius of the image-side surface of the sixth lens; The imaging lens satisfies the relationship: 0.87 < Yc62 / f < 1.512; Wherein, Yc62 is the vertical distance between the inflection point closest to the optical axis on the image-side surface of the sixth lens and the optical axis, and f is the focal length of the lens group.

2. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, characterized in that, The imaging lens satisfies the relationship: f / EPD ≤ 1.79; Wherein, f is the focal length of the lens group and EPD is the entrance pupil diameter.

3. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, wherein The imaging lens satisfies the relationship: 0.44 ≤ CT1 - CT2 ≤ 0.75; Wherein, CT1 is the thickness of the first lens on the optical axis and CT2 is the thickness of the second lens on the optical axis.

4. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, wherein The imaging lens satisfies the relationship: 2.5 < EPD / BL; Wherein, EPD is the entrance pupil diameter and BL is the distance from the image-side surface of the sixth lens to the imaging surface.

5. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, characterized in that, The imaging lens satisfies the relationship: 1.29 < TTL / IMGH < 1.5; Wherein, TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface, and IMGH is the maximum image height of the imaging lens.

6. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, wherein The imaging lens satisfies the relationship: 0.64 < ACT / ALT < 0.7; Wherein, ACT is the total thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens on the optical axis, and ALT is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens.

7. The large-aperture high-pixel ultra-thin imaging lens according to claim 1, wherein The object-side surfaces and image-side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all aspherical surfaces.

Images