Optical lens

Abstract

This invention discloses an optical lens, which comprises, along the optical axis from the object side to the imaging plane, the following components in sequence: an aperture stop; a first lens with positive optical power, whose object side is convex and image side is concave; a second lens with positive optical power, whose object side is convex; a third lens with negative optical power; a fourth lens with positive optical power, whose object side is convex; a fifth lens with positive optical power, whose object side is concave and image side is convex; a sixth lens with negative optical power; and a seventh lens with negative optical power, whose object side is concave; wherein the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -7.0 < (f6 + f7) / f < -1.0. The optical lens provided by this invention features high pixel count and compact structure.

Description

Technical Field

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

[0002] Currently, with the widespread use of portable electronic devices and the popularity of social media, video, and live streaming software, people's love for photography is growing. Camera lenses have become a standard feature of electronic devices, and they have even become a primary consideration for consumers when purchasing electronic devices.

[0003] With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also moving towards ultra-thinness, full-screen displays, and ultra-high-definition imaging. This places higher demands on the camera lenses mounted on portable electronic devices, requiring them to have sufficient optical performance and imaging capabilities, as well as a certain aesthetic appeal, while keeping pace with the evolution of electronic devices. Furthermore, achieving high pixel counts without shrinking the pixel size of the sensor chip has made increasing the sensor chip size a significant development trend for high-pixel lenses. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has advantages such as small size and high pixel count, in order to meet the photography needs of consumers.

[0005] The present invention achieves the above-mentioned objectives through the following technical solutions.

[0006] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: an aperture stop; a first lens with positive optical power, the object side of which is convex and the image side of which is concave; a second lens with positive optical power, the object side of which is convex; a third lens with negative optical power; a fourth lens with positive optical power, the object side of which is convex; a fifth lens with positive optical power, the object side of which is concave and the image side of which is convex; a sixth lens with negative optical power; and a seventh lens with negative optical power, the object side of which is concave; wherein the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -7.0 < (f6 + f7) / f < -1.0.

[0007] Compared to existing technologies, the optical lens provided by this invention uses seven lenses with specific shapes and a specific combination of optical power, which gives the optical lens features such as 50M high resolution and compact structure. At the same time, the optical lens can be paired with a large-size sensor chip with a size of 1 / 1.3 inches, making the optical lens clearer when working in dim environments or in sunlight. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention.

[0009] Figure 2 This is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention.

[0010] Figure 3 This is a distortion curve diagram of the optical lens according to the first embodiment of the present invention.

[0011] Figure 4 This is an axial chromatic aberration curve of the optical lens in the first embodiment of the present invention.

[0012] Figure 5 This is a chromatic aberration curve of the optical lens in the first embodiment of the present invention.

[0013] Figure 6 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention.

[0014] Figure 7 This is a field curvature curve diagram of the optical lens according to the second embodiment of the present invention.

[0015] Figure 8 This is a distortion curve diagram of the optical lens according to the second embodiment of the present invention.

[0016] Figure 9 This is an axial chromatic aberration curve of the optical lens in the second embodiment of the present invention.

[0017] Figure 10 This is a chromatic aberration curve of the optical lens in the second embodiment of the present invention.

[0018] Figure 11 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention.

[0019] Figure 12 This is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention.

[0020] Figure 13 This is a distortion curve diagram of the optical lens according to the third embodiment of the present invention.

[0021] Figure 14 This is an axial chromatic aberration curve of the optical lens in the third embodiment of the present invention.

[0022] Figure 15 This is a chromatic aberration curve of the optical lens in the third embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0025] This invention proposes an optical lens with a total of seven lenses, which are arranged along the optical axis from the object side to the imaging plane as follows: aperture stop, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and filter, and the optical centers of each lens are located on the same straight line.

[0026] Specifically, the first lens has positive optical power, with a convex object-side surface and a concave image-side surface; the second lens has positive optical power, with a convex object-side surface; the third lens has negative optical power; the fourth lens has positive optical power, with a convex object-side surface; the fifth lens has positive optical power, with a concave object-side surface and a convex image-side surface; the sixth lens has negative optical power; and the seventh lens has negative optical power, with a concave object-side surface. The entrance pupil diameter (EPD) of the optical lens is greater than 3.5 mm, and the total optical length (TTL) of the optical lens is less than 8.2 mm. The optical lens provided by this invention features 50M high resolution and a compact structure. Furthermore, this optical lens can be paired with a large-size sensor chip with a 1 / 1.3-inch sensor, resulting in clearer imaging in low-light or sunlight conditions.

[0027] In some embodiments, the optical lens satisfies the following condition:

[0028] -7.0<(f6+f7) / f<-1.0; (1)

[0029] Where f6 represents the effective focal length of the sixth lens, f7 represents the effective focal length of the seventh lens, and f represents the effective focal length of the optical lens. When the above condition (1) is satisfied, the focal lengths of the sixth and seventh lenses can be reasonably allocated, which is beneficial to improving the aberrations at the edge of the field of view, enhancing the imaging quality of the optical lens, and ensuring that the optical lens has the characteristic of a large image plane. Furthermore, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -4.0 < (f6 + f7) / f < -3.0.

[0030] In some embodiments, the optical lens satisfies the following condition:

[0031] 1.6 < f / EPD < 2.0; (2)

[0032] Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When the above condition (2) is satisfied, it is beneficial for the optical lens to achieve a large aperture characteristic, making the image clearer when the optical lens works in dim environments or sunlight. Furthermore, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.7 < f / EPD < 1.9.

[0033] In some embodiments, the optical lens satisfies the following condition:

[0034] 1.0 < TTL / IH < 1.4; (3)

[0035] Wherein, TTL represents the total optical length of the optical lens, and IH represents the half-image height corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens. When the above condition (3) is satisfied, the total length of the optical lens can be effectively reduced, which is beneficial to the miniaturization of the optical lens. Furthermore, the total optical length TTL of the optical lens and the half-image height IH corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens satisfy: 1.2 < TTL / IH < 1.3.

[0036] In some embodiments, the optical lens satisfies the following condition:

[0037] 0.5 < f12 / f < 1.5; (4)

[0038] Where f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the optical lens. When the above condition (4) is satisfied, the focal lengths of the first lens and the second lens can be reasonably allocated, which is conducive to the smoother transmission of light to the subsequent lens group, correcting the aberrations and field curvature of the optical lens, improving the imaging quality of the optical lens, and also conducive to suppressing the back focal length of the optical lens and maintaining the miniaturization of the optical lens. Furthermore, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f12 / f < 1.3.

[0039] In some embodiments, the optical lens satisfies the following condition:

[0040] 1.2<T12 / (T23+T34)<1.8; (5)

[0041] Wherein, T12 represents the air gap between the first lens and the second lens on the optical axis, T23 represents the air gap between the second lens and the third lens on the optical axis, and T34 represents the air gap between the third lens and the fourth lens on the optical axis. When the above condition (5) is satisfied, the structure of the optical lens can be made more compact, which is beneficial to shortening the total length of the optical lens and realizing the miniaturization of the optical lens.

[0042] In some embodiments, the optical lens satisfies the following condition:

[0043] 1.5 < f4 / f5 < 2.5; (6)

[0044] 0<(R51-R52) / (R51+R52)<1.0; (7)

[0045] Where f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, R51 represents the radius of curvature of the object-side surface of the fifth lens, and R52 represents the radius of curvature of the image-side surface of the fifth lens. Satisfying the above conditions (6) and (7) allows the eccentricity sensitivity of the fifth lens to be distributed to the fourth lens, which is beneficial for improving the overall optimization space of the optical lens, thereby further enhancing the optical performance of the optical lens and achieving high-definition imaging.

[0046] In some embodiments, the optical lens satisfies the following condition:

[0047] 0 < f / (R61-R62) < 0.5; (8)

[0048] Where f represents the effective focal length of the optical lens, R61 represents the radius of curvature of the object side of the sixth lens, and R62 represents the radius of curvature of the image side of the sixth lens. When the above condition (8) is satisfied, the shape of the sixth lens can be reasonably controlled so that it can bear a suitable optical power, which helps to correct the aberrations of the optical lens and improve the imaging quality of the optical lens.

[0049] In some embodiments, the optical lens satisfies the following condition:

[0050] 2.0 < TTL / EPD < 2.5; (9)

[0051] Where TTL represents the total optical length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When the above condition (9) is satisfied, by reasonably controlling the ratio of the total optical length of the optical lens to the entrance pupil diameter, it is beneficial to shorten the total optical length of the optical lens and make the structure of the optical lens more compact.

[0052] In some embodiments, the optical lens satisfies the following condition:

[0053] 0.3<D1 / (IH×tanθ)<1.0; (10)

[0054] Where D1 represents the effective diameter of the first lens, IH represents the half-image height corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens, and θ represents the maximum half-field of view of the optical lens. When the above condition (10) is satisfied, the optical lens can have the characteristics of a large target surface, which can be matched with a 1 / 1.3-inch chip, which is beneficial to improving the resolution and image detail reproduction of the optical lens, and at the same time, it is beneficial to reduce the front diameter of the optical lens, thus realizing the miniaturization of the optical lens. Furthermore, the effective diameter D1 of the first lens, the half-image height IH corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens, and the maximum half-field of view θ of the optical lens satisfy: 0.5<D1 / (IH×tanθ)<0.7.

[0055] In some embodiments, the optical lens satisfies the following condition:

[0056] 0.7 < CT6 / CT7 < 1.1; (11)

[0057] 1.8 < CT4 / CT3 < 2.8; (12)

[0058] Wherein, CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, CT6 represents the center thickness of the sixth lens, and CT7 represents the center thickness of the seventh lens. When the above conditions (11) and (12) are satisfied, the lenses can be made more uniform and compact, which is conducive to shortening the total length of the optical lens, realizing the miniaturization of the optical lens, and at the same time, it is conducive to balancing various optical performance parameters of the optical lens and improving the imaging quality of the optical lens.

[0059] In some embodiments, the optical lens satisfies the following condition:

[0060] 6.5 mm<IH / tanθ<6.8 mm; (13)

[0061] Wherein, IH represents the half-image height corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens, and θ represents the maximum half-field of view of the optical lens. When the above condition (13) is satisfied, by reasonably controlling the ratio of IH / tanθ, the optical lens can have the characteristics of a large target surface.

[0062] In some embodiments, the optical lens satisfies the following condition:

[0063] 2.6 < DM7 / DM1 < 2.8; (14)

[0064] Wherein, DM7 represents the effective diameter of the seventh lens, and DM1 represents the effective diameter of the first lens. When the above condition (14) is satisfied, the effective diameters of the first and seventh lenses can be effectively controlled, which is beneficial to shortening the total length of the optical lens and making the structure more compact.

[0065] In some embodiments, the optical lens satisfies the following condition:

[0066] 1.0 < TTL / f < 1.5; (15)

[0067] Where TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens. When the above condition (15) is satisfied, it is beneficial to shorten the overall length of the optical lens and realize the miniaturization of the optical lens.

[0068] In some embodiments, the optical lens satisfies the following condition:

[0069] 3.5 < EPD / BFL < 5.0; (16)

[0070] Wherein, EPD represents the entrance pupil diameter of the optical lens, and BFL represents the optical back focal length of the optical lens. When the above condition (16) is satisfied, the optical lens can obtain a shorter back focal length, which is beneficial to the miniaturization of the optical lens.

[0071] In some embodiments, the optical lens satisfies the following condition:

[0072] -5.0 < f3 / f < -1.0; (17)

[0073] 0<(R31+R32) / (R31-R32)<2.0; (18)

[0074] Where f3 represents the effective focal length of the third lens, f represents the effective focal length of the optical lens, R31 represents the radius of curvature of the object side of the third lens, and R32 represents the radius of curvature of the image side of the third lens. When the above conditions (17) and (18) are satisfied, by reasonably setting the focal length and surface shape of the third lens, it is beneficial to reduce the total length of the optical lens, and at the same time better correct the aberrations of the optical lens and improve the imaging quality of the optical lens.

[0075] In some embodiments, the optical lens satisfies the following condition:

[0076] 0<(CT5+CT56) / TTL<0.3; (19)

[0077] Wherein, CT5 represents the center thickness of the fifth lens, CT56 represents the air gap between the fifth lens and the sixth lens on the optical axis, and TTL represents the total optical length of the optical lens. When the above condition (19) is satisfied, the center thickness and surface shape of the fifth lens can be effectively controlled, thereby effectively correcting the spherical aberration of the optical lens, improving image quality, and enhancing imaging quality.

[0078] In one embodiment, the present invention employs a seven-lens plastic structure, which achieves miniaturization and high resolution of the optical lens while ensuring good imaging performance. More preferably, the first, second, third, fourth, fifth, sixth, and seventh lenses are all aspherical plastic lenses, resulting in better image quality, a more compact structure, and a shorter overall optical length.

[0079] The surface shape of the aspherical lens in each embodiment of the present invention satisfies the following equation:

[0080]

[0081] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial radius of curvature of the surface, k is the quadratic surface coefficient, and A 2i is the aspherical surface shape coefficient of the 2ith order.

[0082] In the following embodiments, the thickness and radius of curvature of each lens in the optical lens are different. For details, please refer to the parameter table of each embodiment.

[0083] First Embodiment

[0084] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.

[0085] Among them, the first lens L1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens L2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens L3 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is concave near the optical axis; the fourth lens L4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave near the optical axis. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspherical lenses. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 all have positive optical power. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The sixth lens L6 has negative optical power. The object-side surface S11 of the sixth lens is convex near the optical axis, and the image-side surface S12 of the sixth lens is concave near the optical axis. The seventh lens L7 has negative optical power. The object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave near the optical axis. The object-side surface of the filter G1 is S15, and the image-side surface is S16.

[0086] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0087] Table 1

[0088]

[0089]

[0090] The aspherical surface coefficients of the optical lens 100 in this embodiment are shown in Table 2.

[0091] Table 2

[0092]

[0093]

[0094] Please refer to Figure 2 , Figure 3 , Figure 4 as well as Figure 5 The figures shown are the field curvature curve, distortion curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 100. Figure 2 As can be seen, the field curvature is controlled within ±0.05mm, indicating that the field curvature of the optical lens 100 is well corrected; from Figure 3 The distortion is controlled within ±1.8%, indicating that the distortion correction of the optical lens 100 is good; from Figure 4It can be seen that the axial chromatic aberration offset is controlled within ±0.05mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected; from Figure 5 As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths is controlled within ±2μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 2 , Figure 3 , Figure 4 as well as Figure 5 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0095] Second Embodiment

[0096] Please see Figure 6 The figure shows a schematic diagram of the structure of the optical lens 200 provided in the second embodiment of the present invention. The optical lens 200 in this embodiment is roughly the same as that in the first embodiment described above. The main differences are that the object side of the third lens is convex near the optical axis and the curvature radius and aspherical coefficient of each lens surface are different.

[0097] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0098] Table 3

[0099]

[0100]

[0101] The aspherical surface coefficients of the optical lens 200 in this embodiment are shown in Table 4.

[0102] Table 4

[0103] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> S1 1.65E-02 -1.24E-05 4.18E-04 2.69E-05 4.19E-05 S2 -3.45E-01 -5.22E-04 -1.45E-04 4.43E-04 -1.24E-04 S3 -1.20E+01 -6.67E-03 -1.46E-03 2.82E-04 4.72E-04 S4 -1.25E+01 -1.00E-02 -5.21E-03 1.16E-03 4.98E-04 S5 4.60E+02 -1.17E-02 -9.94E-03 6.04E-04 6.31E-04 S6 2.46E+01 -8.09E-03 -3.97E-03 5.54E-04 1.80E-04 S7 -6.80E+01 3.37E-03 1.40E-03 -3.83E-04 -1.06E-05 S8 0.00E+00 -8.50E-03 6.06E-04 1.20E-04 -9.46E-06 S9 1.41E+01 -2.13E-03 -1.75E-03 -1.76E-04 1.61E-05 S10 -2.39E-01 6.47E-03 -8.34E-04 -6.35E-05 -4.90E-06 S11 -3.34E+02 -1.71E-02 -6.43E-04 8.77E-05 8.02E-06 S12 4.38E-01 -1.72E-02 5.11E-04 9.37E-06 -1.31E-06 S13 -9.29E-01 -1.74E-03 9.43E-05 4.78E-06 1.19E-07 S14 -2.10E+02 -5.87E-03 2.29E-04 -2.00E-06 -3.65E-07 Face number <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 -1.51E-05 -3.85E-07 1.26E-06 S2 -1.39E-05 2.03E-05 -1.86E-06 S3 4.24E-05 -8.43E-05 1.92E-05 S4 -1.83E-05 -7.36E-05 1.56E-05 S5 -2.85E-05 -7.62E-05 1.20E-05 S6 -2.72E-05 -2.65E-05 8.39E-06 S7 9.43E-06 2.44E-06 -4.10E-07 S8 -3.99E-07 2.33E-07 8.25E-08 S9 -6.13E-06 -2.10E-06 3.88E-07 S10 3.51E-06 9.88E-08 -3.00E-08 S11 -5.52E-07 -2.09E-07 1.86E-08 S12 -1.44E-07 -1.22E-09 1.01E-09 S13 4.22E-09 6.48E-10 -6.54E-11 S14 6.07E-09 3.75E-10 -1.00E-11

[0104] Please refer to Figure 7 , Figure 8 , Figure 9 as well as Figure 10 The figures shown are the field curvature curve, distortion curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 200. Figure 7 As can be seen, the field curvature is controlled within ±0.18mm, indicating that the field curvature of the 200mm optical lens is well corrected; from Figure 8 The distortion is controlled within ±2%, indicating that the distortion correction of the 200mm optical lens is good; from Figure 9 It can be seen that the axial chromatic aberration offset is controlled within ±0.06mm, indicating that the axial chromatic aberration of the optical lens 200 is well corrected; from Figure 10As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths is controlled within ±2.5μm, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected; from Figure 7 , Figure 8 , Figure 9 as well as Figure 10 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0105] Third Embodiment

[0106] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 300 provided in the third embodiment of the present invention. The optical lens 300 in this embodiment is roughly the same as that in the first embodiment above. The main differences are: the object side of the third lens is convex near the optical axis, and the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0107] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0108] Table 5

[0109]

[0110] The aspherical surface coefficients of the optical lens 300 in this embodiment are shown in Table 6.

[0111] Table 6

[0112]

[0113] Please refer to Figure 12 , Figure 13 , Figure 14 as well as Figure 15 The figures shown are the field curvature curve, distortion curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 300. Figure 12 As can be seen, the field curvature is controlled within ±0.1mm, indicating that the field curvature of the 300mm optical lens is well corrected; from Figure 13 The distortion is controlled within ±3%, indicating that the distortion correction of the 300mm optical lens is good; from Figure 14 It can be seen that the axial chromatic aberration offset is controlled within ±0.06mm, indicating that the axial chromatic aberration of the 300mm optical lens is well corrected; from Figure 15 As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths is controlled within ±2μm, indicating that the transverse chromatic aberration of the 300mm optical lens is well corrected; from Figure 12 , Figure 13 , Figure 14 as well as Figure 15It can be seen that the aberrations of the 300mm optical lens are well balanced, resulting in good optical imaging quality.

[0114] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the three embodiments above, including the maximum field of view (FOV), total optical length (TTL), half-image height (IH), effective focal length (f), entrance pupil diameter (EPD), and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0115] Table 7

[0116] First Embodiment Second Embodiment Third Embodiment FOV (°) 87.6 87.6 87.6 TTL(mm) 8.175 7.854 8.027 f(mm) 6.548 6.313 6.351 IH(mm) 6.454 6.299 6.325 EPD (mm) 3.638 3.671 3.687 (f6+f7) / f -3.578 -3.367 -3.116 f / EPD 1.834 1.757 1.760 TTL / IH 1.267 1.247 1.269 f12 / f 1.320 1.364 1.335 T12 / (T23+T34) 1.495 1.320 1.362 f4 / f5 1.891 2.197 2.052 (R51-R52) / (R51+R52) 0.614 0.567 0.540 f / (R61-R62) 0.053 0.188 0.219 TTL / EPD 2.247 2.140 2.177 D1 / (IH×tanθ) 0.588 0.608 0.608 CT6 / CT7 0.813 1.018 0.969 CT4 / CT3 2.718 2.009 1.995 IH / tanθ(mm) 6.730 6.568 6.596 DM7 / DM1 2.766 2.628 2.716 TTL / f 1.249 1.244 1.264 EPD / BFL 4.043 4.706 4.916 f3 / f -1.980 -4.678 -4.101 (R31+R32) / (R31-R32) 0.625 1.740 1.486 (CT5+CT56) / TTL 0.112 0.156 0.136

[0117] Compared with the prior art, the optical lens provided by the present invention has at least the following advantages:

[0118] (1) The optical lens provided by the present invention can be paired with a GN1 sensor chip with a large size of 1 / 1.3 inches, so that the optical lens can produce clearer images when working in dim environments or in sunlight.

[0119] (2) The present invention uses seven plastic aspherical lenses with specific optical power and specific surface shapes to ensure better imaging quality while satisfying the requirements of more compact structure and smaller total length.

[0120] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0121] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An optical lens, wherein the optical lens comprises seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: Aperture; A first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave; A second lens with positive optical power, wherein the object side of the second lens is convex; A third lens with negative optical power; A fourth lens with positive optical power, wherein the object side of the fourth lens is convex; A fifth lens with positive optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex; A sixth lens with negative optical power; A seventh lens with negative optical power, wherein the object side of the seventh lens is concave; The effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -7.0 < (f6 + f7) / f < -1.

0.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.6 < f / EPD < 2.0; Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens; The effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -4.0 < (f6 + f7) / f < -3.

0.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.0 < TTL / IH < 1.4; Wherein, TTL represents the total optical length of the optical lens, and IH represents the half-image height corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens; The effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical lens satisfy: -3.578≤(f6+f7) / f≤-3.

116.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.5 < f12 / f < 1.5; Where f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the optical lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.2 < T12 / (T23+T34) < 1.8; Wherein, T12 represents the air gap between the first lens and the second lens on the optical axis, T23 represents the air gap between the second lens and the third lens on the optical axis, and T34 represents the air gap between the third lens and the fourth lens on the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.5 < f4 / f5 < 2.5; Where f4 represents the effective focal length of the fourth lens and f5 represents the effective focal length of the fifth lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0 < f / (R61-R62) < 0.5; Where f represents the effective focal length of the optical lens, R61 represents the radius of curvature of the object side of the sixth lens, and R62 represents the radius of curvature of the image side of the sixth lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 2.0 < TTL / EPD < 2.5; Wherein, TTL represents the total optical length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.3 < D1 / (IH×tanθ) < 1.0; Wherein, D1 represents the effective diameter of the first lens, IH represents the half-image height corresponding to the diagonal field of view of the effective pixel area on the imaging surface of the optical lens, and θ represents the maximum half-field of view of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.7 < CT6 / CT7 < 1.1; 1.8 < CT4 / CT3 < 2.8; Wherein, CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, CT6 represents the center thickness of the sixth lens, and CT7 represents the center thickness of the seventh lens.

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