Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, in sequence: a diaphragm; a first lens with negative focal length, the object side of which is a convex surface and the image side is a concave surface; a second lens with positive focal length, the object side of which is a convex surface and the image side is a concave surface; a third lens with negative focal length; a fourth lens with positive focal length, the object side of which is a convex surface and the image side is a convex surface; a fifth lens with positive focal length, the object side of which is a convex surface near the optical axis and the image side is a concave surface near the optical axis; a sixth lens with positive focal length, the object side of which is a concave surface and the image side is a convex surface; and a seventh lens with negative focal length. The optical lens has the advantages of long focal length, short depth of field, high pixel and small head.

Description

Technical Field

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

[0002] In recent years, with the rise of smartphones, major brands have increasingly demanded differentiated shooting capabilities in their flagship phones, leading to the emergence of portrait lenses. Portrait lenses are generally telephoto lenses, whose unique long focal length gives them a shallow depth of field. This allows them to effectively highlight the subject by blurring the background, resulting in more vivid portraits. Therefore, telephoto lenses are often referred to as portrait lenses.

[0003] Generally, telephoto lenses have an f / n (aperture value) of around 3.0. When shooting distant objects, their large depth of field can easily make it difficult to clearly define the subject, resulting in a weaker image. To effectively blur the background and highlight the subject, reducing the lens's f / n and increasing the aperture to narrow the depth of field has become a trend in portrait lenses. Furthermore, if the lens can be paired with a larger sensor, it can improve lens resolution and image detail reproduction, making it more competitive in the market. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of long focal length, short depth of field, and high pixel count, and can meet the usage requirements of portable electronic devices.

[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 negative optical power, wherein the object side is convex and the image side is concave; a second lens with positive optical power, wherein the object side is convex and the image side is concave; a third lens with negative optical power; a fourth lens with positive optical power, wherein the object side is convex and the image side is convex; a fifth lens with positive optical power, wherein the object side is convex near the optical axis and the image side is concave near the optical axis; a sixth lens with positive optical power, wherein the object side is concave and the image side is convex; and a seventh lens with negative optical power.

[0007] Compared to existing technologies, the optical lens provided by this invention employs seven lenses with specific optical power. Through specific surface shape combinations and reasonable optical power allocation, the optical lens possesses advantages such as excellent image quality, long focal length, short depth of field, small head, and large target surface. It can be matched with a 1 / 1.3-inch 50M (Megapixel) imaging chip to achieve ultra-high-definition imaging. At the same time, by reasonably configuring the aperture size, the amount of light entering the system can be increased while reducing the depth of field during shooting. This ensures both the image quality of the optical lens in low-light environments and the ability to effectively blur the background and highlight the focused subject during shooting, better meeting the portrait shooting needs of portable electronic devices. 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 distortion curve diagram of the optical lens according to the first embodiment of the present invention.

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

[0011] Figure 4 This is a chromatic aberration curve of the optical lens according to the first embodiment of the present invention.

[0012] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention.

[0013] Figure 6 This is a distortion curve diagram 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 chromatic aberration curve of the optical lens according to the second embodiment of the present invention.

[0016] Figure 9 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention.

[0017] Figure 10 This is a distortion curve diagram of the optical lens according to the third embodiment of the present invention.

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

[0019] Figure 12 This is a chromatic aberration curve of the optical lens according to the third embodiment of the present invention. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] The present invention proposes an optical lens, which includes, in sequence along the optical axis from the object side to the imaging plane: an aperture stop, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter, and the optical centers of each lens are located on the same straight line.

[0023] The first lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. The second lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The third lens has negative optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave. The fourth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The fifth lens has positive optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The sixth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex. The seventh lens has negative optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. At least one of the first to seventh lenses is an aspherical lens.

[0024] The optical lens provided by this invention uses a combination of seven lenses and places the aperture stop in front of the first lens. At the same time, through specific surface shape matching and reasonable optical power distribution, the optical lens has good imaging quality under the conditions of long focal length and large aperture.

[0025] In some embodiments, the optical lens satisfies the following condition:

[0026] 0.05 < SP45 / SP56 < 0.25; (1)

[0027] Wherein, SP45 represents the air gap between the fourth lens and the fifth lens near the optical axis, and SP56 represents the air gap between the fifth lens and the sixth lens near the optical axis. When the above condition (1) is satisfied, the distance between the fifth lens and the front and rear lenses can be reasonably controlled, which is beneficial to the miniaturization and compactness of the optical lens, and at the same time, it is beneficial to reduce the assembly difficulty of the optical lens. Furthermore, the air gap SP45 between the fourth lens and the fifth lens near the optical axis and the air gap SP56 between the fifth lens and the sixth lens near the optical axis satisfy: 0.1 < SP45 / SP56 < 0.23.

[0028] In some embodiments, the optical lens satisfies the following condition:

[0029] 3.0mm<EPD×tanθ<3.8mm; (2)

[0030] Wherein, EPD represents the entrance pupil diameter of the optical lens, and θ represents the maximum half-field angle of the optical lens. When the above condition (2) is satisfied, the amount of light entering the optical lens can be effectively increased, which is beneficial to ensuring the imaging quality of the optical lens in darker environments and ensuring the high imaging quality of the optical lens. Furthermore, the entrance pupil diameter EPD of the optical lens and the maximum half-field angle θ of the optical lens satisfy: 3.3mm < EPD × tanθ < 3.6mm.

[0031] In some embodiments, the optical lens satisfies the following condition:

[0032] f / EPD < 1.9; (3)

[0033] 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 (3) is satisfied, the amount of light entering the optical lens can be increased, while the depth of field during shooting can be reduced. This is beneficial to ensuring the imaging quality of the optical lens in darker environments, and at the same time, it can effectively blur the background and highlight the subject during shooting, achieving the effect of a telephoto lens. 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.

[0034] In some embodiments, the optical lens satisfies the following condition:

[0035] 1.5 < IH / EPD < 2.0; (4)

[0036] Wherein, IH represents the image height corresponding to the maximum half field of view of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When the above condition (4) is satisfied, it is beneficial to balance the image plane size and the relative illumination of the edge field of view, and to achieve a balance between a large field of view, a large aperture, and miniaturization.

[0037] In some embodiments, the optical lens satisfies the following condition:

[0038] -25.0 < f1 / f < -5.0; (5)

[0039] 1.0 < R11 / R12 < 1.5; (6)

[0040] Where f1 represents the effective focal length of the first lens, f represents the effective focal length of the optical lens, R11 represents the radius of curvature of the object side of the first lens, and R12 represents the radius of curvature of the image side of the first lens. When the above conditions (5) and (6) are satisfied, it can prevent the light entering the optical lens from being deflected too much, reduce the sensitivity of the optical lens, and at the same time help the optical lens to better balance aberrations and improve the imaging quality of the optical lens.

[0041] In some embodiments, the optical lens satisfies the following condition:

[0042] 0.5 < f² / f < 2.0; (7)

[0043] -5.0<(R21+R22) / (R21-R22)<-2.0; (8)

[0044] Where f2 represents the effective focal length of the second lens, f represents the effective focal length of the optical lens, R21 represents the radius of curvature of the object side of the second lens, and R22 represents the radius of curvature of the image side of the second lens. When the above conditions (7) and (8) are satisfied, the focal length and surface shape of the second lens can be reasonably controlled, which is conducive to the smooth transition of light. At the same time, it can correct the aberrations caused by excessive refraction of light by the first lens, improve the imaging quality of the optical lens, and reduce the processing difficulty of the optical lens.

[0045] In some embodiments, the optical lens satisfies the following condition:

[0046] 0.15 < CT3 / CT4 < 0.3; (9)

[0047] 1.0 < f4 / f < 3.0; (10)

[0048] -5.0 < f3 / f < -1.0; (11)

[0049] Wherein, CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, and f represents the effective focal length of the optical lens. When the above conditions (9) to (11) are satisfied, the focal length and center thickness of the third and fourth lenses can be reasonably allocated, which is beneficial to reducing the sensitivity of the optical lens, reducing astigmatism, effectively increasing the focal length of the optical lens, and at the same time helping to reduce the overall length of the optical lens.

[0050] In some embodiments, the optical lens satisfies the following condition:

[0051] 1.0 < f6 / f < 2.5; (12)

[0052] -6.0<f6 / (R61+R62)<-2.0; (13)

[0053] Wherein, f6 represents the effective focal length of the sixth lens, 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 conditions (12) and (13) are satisfied, the focal length and surface shape of the sixth lens can be reasonably controlled, the shape change of the sixth lens can be slowed down, the system sensitivity can be reduced, the formability of the lens can be improved, the manufacturing yield of the lens can be increased, and at the same time, it is beneficial to correct astigmatism, improve distortion, and improve the imaging quality of the optical lens.

[0054] In some embodiments, the optical lens satisfies the following condition:

[0055] 1.0 < ∑CT / ∑SP < 2.0; (14)

[0056] Wherein, ∑CT represents the sum of the center thicknesses of the first lens to the seventh lens, and ∑SP represents the sum of the air gaps between adjacent lenses from the first lens to the seventh lens. When the above condition (14) is satisfied, the proportion of the center thicknesses and air gaps of each lens inside the optical lens can be reasonably allocated, which helps to improve the manufacturability of lens forming and lens assembly, and also helps to ensure the miniaturization of the lens.

[0057] In some embodiments, the optical lens satisfies the following condition:

[0058] 1.0 < TTL / f < 1.5(15)

[0059] Where f represents the effective focal length of the optical lens, and TTL represents the total optical length of the optical lens. When the above condition (15) is satisfied, the optical lens can have a longer effective focal length and a shorter total lens length by reasonably setting the value of TTL / f, thus maintaining the miniaturization of the lens.

[0060] In some embodiments, the optical lens satisfies the following condition:

[0061] 1.5 < SD62 / SD12 < 2.0; (16)

[0062] Wherein, SD12 represents the effective aperture of the image side of the first lens, and SD62 represents the effective aperture of the image side of the sixth lens. When the above condition (16) is satisfied, the optical lens can be miniaturized and have a small head, while also helping to correct coma and field curvature in the off-axis field of view, thereby improving the imaging quality of the optical lens.

[0063] In some embodiments, the optical lens satisfies the following condition:

[0064] -1.5 < f7 / f < -0.8; (17)

[0065] 0.1 < CT7 / TTL < 0.21; (18)

[0066] Where f7 represents the effective focal length of the seventh lens, f represents the effective focal length of the optical lens, CT7 represents the center thickness of the seventh lens, and TTL represents the total optical length of the optical lens. When the above conditions (17) and (18) are met, by reasonably allocating the focal length and center thickness of the seventh lens, it is beneficial to correct the aberrations of the optical lens, and at the same time, it helps to increase the focal length of the optical lens.

[0067] In some embodiments, the optical lens satisfies the following condition:

[0068] -0.5 < SAG71 / CT7 < 0.1; (19)

[0069] -0.5 < SAG72 / CT7 < 0.2; (20)

[0070] Wherein, SAG71 represents the sag at the maximum effective aperture on the object side of the seventh lens, SAG72 represents the sag at the maximum effective aperture on the image side of the seventh lens, and CT7 represents the center thickness of the seventh lens. When the above conditions (19) and (20) are satisfied, by adjusting the surface shape of the seventh lens, the field curvature sensitivity of the entire optical lens can be reasonably reduced, the contribution of the seventh lens to astigmatism and coma in the entire optical lens can be reduced, and at the same time, it is beneficial to reduce the surface shape complexity of the object side and image side of the seventh lens, and improve the lens processing and production yield.

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

[0072] -18.0 < f1 / f2 < -2.0; (21)

[0073] Where f1 represents the effective focal length of the first lens and f2 represents the effective focal length of the second lens. When the above condition (21) is satisfied, the optical power of the first lens and the second lens can be reasonably allocated, which is conducive to quickly narrowing the incident angle of light, making the optical lens structure more compact, achieving the purpose of a small lens head, and at the same time, it is conducive to the optical lens to better balance aberrations and improve the imaging quality of the optical lens.

[0074] In some embodiments, the optical lens satisfies the following condition:

[0075] 8.0mm / rad<IH / θ<9.0mm / rad; (22)

[0076] Where θ represents the maximum half-field angle of the optical lens, and IH represents the image height corresponding to the maximum half-field angle of the optical lens. When the above condition (22) is satisfied, it indicates that the optical lens has a large imaging surface, which can match a 1 / 1.3-inch imaging chip and realize ultra-high-definition imaging.

[0077] In some embodiments, the optical lens satisfies the following condition:

[0078] -2.0 < f / R42 < 0; (23)

[0079] 0 < f / R32 < 2.0; (24)

[0080] Where f represents the effective focal length of the optical lens, R32 represents the radius of curvature of the image-side surface of the third lens, and R42 represents the radius of curvature of the image-side surface of the fourth lens. When the above conditions (23) and (24) are satisfied, it is beneficial to reduce the shape changes of the third and fourth lenses and reduce the contribution of the third and fourth lenses to astigmatism and coma in the entire optical lens.

[0081] In some embodiments, the optical lens satisfies the following condition:

[0082] 1.5 < f5 / f < 2.5; (25)

[0083] Where f5 represents the effective focal length of the fifth lens, and f represents the effective focal length of the optical lens. When the above condition (25) is satisfied, the focal length of the fifth lens can be reasonably controlled so that it can bear a certain positive optical power, which is beneficial to correct the aberration of the optical lens, reduce the tolerance sensitivity, and at the same time maintain the small distortion of the optical lens, so that the optical lens has a longer focal length.

[0084] As one implementation method, all-plastic lenses or a combination of glass and plastic can be used, both of which can achieve good imaging results. In this application, the first to seventh lenses all use all-plastic lenses. By rationally allocating the optical power of each lens and optimizing the surface shape, the optical lens can at least have the advantages of long focal length, short depth of field, high pixel count, and small head. Furthermore, the first to seventh lenses can all be plastic aspherical lenses. Using aspherical lenses can effectively correct aberrations, improve image quality, and provide a more cost-effective optical performance product.

[0085] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness and radius of curvature of each lens in the optical lens are different; for specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

[0086] In various embodiments of the present invention, when an aspherical lens is used, the surface shape of the aspherical lens satisfies the following equation:

[0087]

[0088] 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 curvature of the surface, k is the conic coefficient, and A 2i is the aspherical surface shape coefficient of the 2ith order.

[0089] First Embodiment

[0090] 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.

[0091] The first lens L1 has negative 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 convex near the optical axis, and its image-side surface S6 is concave. The fourth lens L4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens L5 has positive optical power, its object-side surface S9 is convex near the optical axis, and its image-side surface S10 is concave near the optical axis. The sixth lens L6 has positive optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex. The seventh lens L7 has negative optical power, its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is concave near the optical axis. The filter G1 has an object-side surface S15 and an image-side surface S16. Among these, 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.

[0092] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0093] Table 1

[0094]

[0095]

[0096] The surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0097] Table 2

[0098] S1 -7.31E-03 0.00E+00 -3.43E-03 9.34E-04 S2 -5.17E+00 0.00E+00 -4.51E-03 -4.76E-03 S3 -4.38E+00 0.00E+00 2.07E-02 -6.11E-03 S4 1.64E+00 0.00E+00 7.89E-03 1.37E-03 S5 -2.33E+01 0.00E+00 -3.86E-02 -4.21E-03 S6 -7.40E+00 0.00E+00 -2.60E-02 -1.33E-03 S7 -8.86E+02 0.00E+00 1.40E-02 -7.39E-03 S8 -3.38E+00 0.00E+00 -5.09E-02 2.04E-02 S9 -1.55E+01 0.00E+00 -1.39E-02 -4.85E-03 S10 -1.01E+00 0.00E+00 -1.39E-02 -4.82E-03 S11 -7.46E-01 0.00E+00 9.71E-03 -6.23E-03 S12 -8.32E-01 0.00E+00 1.97E-02 -5.65E-03 S13 -7.15E+01 0.00E+00 -5.05E-03 -4.16E-04 S14 -1.01E+01 0.00E+00 -3.84E-03 2.25E-04 Face number <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 1.22E-04 -2.90E-04 1.63E-04 -4.18E-05 S2 1.09E-03 4.44E-04 -3.69E-05 -3.84E-05 S3 -3.43E-03 1.70E-03 5.30E-04 -3.02E-04 S4 -6.06E-03 2.71E-03 -4.16E-05 -8.34E-05 S5 6.39E-03 -1.09E-03 -8.29E-04 4.35E-04 S6 2.12E-03 -3.64E-05 -6.89E-06 -2.65E-05 S7 -2.66E-04 8.71E-04 -3.25E-05 -6.30E-05 S8 -8.60E-03 1.66E-03 1.13E-04 -1.26E-04 S9 5.13E-04 6.81E-05 -4.76E-05 4.23E-06 S10 1.12E-03 -1.03E-04 -7.79E-06 1.77E-06 S11 1.07E-03 1.21E-04 -4.29E-07 -4.66E-06 S12 7.62E-04 1.03E-05 -1.03E-06 -2.56E-07 S13 1.13E-04 -1.16E-05 3.54E-07 1.65E-08 S14 -1.35E-05 4.60E-07 -1.36E-08 3.26E-10

[0099] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures shown are the distortion curve, field curvature curve, and lateral chromatic aberration curve of the optical lens 100, respectively. Figure 2 It can be seen that the optical distortion is controlled within ±2%, indicating that the distortion of the optical lens 100 has been well corrected; from Figure 3 As can be seen, the field curvature is controlled within ±0.05mm, indicating that the field curvature correction of the optical lens 100 is good; from Figure 4 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±2.2 micrometers, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 2 , Figure 3 , Figure 4 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0100] Second Embodiment

[0101] Please see Figure 5 The figure shown is 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, except that the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0102] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0103] Table 3

[0104]

[0105] The surface coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0106] Table 4

[0107]

[0108]

[0109] Please refer to Figure 6 , Figure 7 and Figure 8 The figures shown are the distortion curve, field curvature curve, and lateral chromatic aberration curve of the optical lens 200, respectively. Figure 6 It can be seen that the optical distortion is controlled within ±2%, indicating that the distortion of the 200mm optical lens has been well corrected; from Figure 7 As can be seen, the field curvature is controlled within ±0.18mm, indicating that the field curvature correction of the 200mm optical lens is relatively good; from Figure 8 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±2.5 micrometers, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected; from Figure 6 , Figure 7 , Figure 8 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0110] Third Embodiment

[0111] Please see Figure 9 The figure shown is a structural schematic diagram 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, except that the radius of curvature, aspherical coefficient and thickness of each lens surface are different.

[0112] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0113] Table 5

[0114]

[0115]

[0116] The surface shape coefficients of each aspherical surface of the optical lens 300 in this embodiment are shown in Table 6.

[0117] Table 6

[0118]

[0119]

[0120] Please refer to Figure 10 , Figure 11 and Figure 12 The figures shown are the distortion curve, field curvature curve, and lateral chromatic aberration curve of the optical lens 300, respectively. Figure 10 As can be seen, the optical distortion is controlled within ±2%, indicating that the distortion of the 300mm optical lens has been well corrected; from Figure 11 As can be seen, the field curvature is controlled within ±0.04mm, indicating that the field curvature correction of the 300mm optical lens is good; from Figure 12 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±2.2 micrometers, indicating that the transverse chromatic aberration of the 300mm optical lens is well corrected; from Figure 10 , Figure 11 , Figure 12 It can be seen that the aberrations of the 300mm optical lens are well balanced, resulting in good optical imaging quality.

[0121] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the above four embodiments, including the maximum field of view 2θ, total optical length TTL, half image height IH, effective focal length f, and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0122] Table 7

[0123]

[0124] manual

[0125]

[0126] As can be seen from the distortion curves, field curvature curves, and lateral chromatic aberration curves of the various embodiments above, the distortion values ​​of the optical lenses in each embodiment are all within ±2%, the field curvature values ​​are within ±0.18mm, and the lateral chromatic aberration is within ±2.5 micrometers. This indicates that the optical lens provided by the present invention has advantages such as long focal length, short depth of field, and small head, while also having good resolving power.

[0127] In summary, the optical lens provided by this invention employs seven aspherical lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power allocation, the optical lens possesses advantages such as excellent image quality, long focal length, short depth of field, small head, and large target surface. It can be matched with a 1 / 1.3-inch 50M (Megapixel) imaging chip to achieve ultra-high-definition imaging. At the same time, by reasonably configuring the lens aperture size, the amount of light entering the system can be increased while reducing the depth of field during shooting. This ensures both image quality in low-light environments and effective background blurring to highlight the focused subject during shooting, better meeting the portrait shooting needs of portable electronic devices.

[0128] 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.

[0129] 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, 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 negative 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 surface of the second lens is convex and the image-side surface of the second lens is concave; A third lens with negative optical power; A fourth lens with positive optical power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is convex. A fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex near the optical axis and the image-side surface of the fifth lens is concave near the optical axis; A sixth lens with positive optical power, wherein the object-side surface of the sixth lens is concave and the image-side surface of the sixth lens is convex; A seventh lens with negative optical power; The optical lens satisfies the following condition: -25.0 < f1 / f < -5.0; 1.0 < R11 / R12 < 1.5; Where f1 represents the effective focal length of the first lens, f represents the effective focal length of the optical lens, R11 represents the radius of curvature of the object side of the first lens, and R12 represents the radius of curvature of the image side of the first lens. The optical lens has seven optical power lenses.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.05 < SP45 / SP56 < 0.25; SP45 represents the air gap between the fourth lens and the fifth lens near the optical axis, and SP56 represents the air gap between the fifth lens and the sixth lens near the optical axis.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 3.0mm < EPD × tanθ < 3.8mm; Wherein, EPD represents the entrance pupil diameter of the optical lens, and θ represents the maximum half field of view of the optical lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: f / EPD < 1.9; Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.5 < IH / EPD < 2.0; Wherein, IH represents the image height corresponding to the maximum half field of view of the optical lens, and EPD represents the entrance pupil diameter of the optical lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -20.82≤f1 / f≤-5.418; 1.123≤R11 / R12≤1.235; Wherein, f1 represents the effective focal length of the first lens, f represents the effective focal length of the optical lens, R11 represents the radius of curvature of the object side of the first lens, and R12 represents the radius of curvature of the image side of the first lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.5 < f² / f < 2.0; -5.0<(R21+R22) / (R21-R22)<-2.0; Where f2 represents the effective focal length of the second lens, f represents the effective focal length of the optical lens, R21 represents the radius of curvature of the object side of the second lens, and R22 represents the radius of curvature of the image side of the second lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.15 < CT3 / CT4 < 0.3; 1.0 < f4 / f < 3.0; Wherein, CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, f4 represents the effective focal length of the fourth lens, and f represents the effective focal length of the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.0 < f6 / f < 2.5; -6.0 < f6 / (R61+R62) < -2.0; Wherein, f6 represents the effective focal length of the sixth lens, 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.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.0 < ∑CT / ∑SP < 2.0; Wherein, ∑CT represents the sum of the center thicknesses of the first lens to the seventh lens, and ∑SP represents the sum of the air gaps between adjacent lenses from the first lens to the seventh lens.

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