Optical lens

Abstract

The present invention discloses an optical lens, which comprises, in order from the object side to the imaging surface along the optical axis: an aperture; a first lens having positive focal power, whose object side surface is convex and whose image side surface is concave; a second lens having negative focal power, whose object side surface is convex and whose image side surface is concave; a third lens having positive focal power, whose object side surface is convex at the near optical axis and whose image side surface is convex; a fourth lens having negative focal power, whose object side surface is concave; a fifth lens having positive focal power, whose object side surface is concave and whose image side surface is convex; a sixth lens having positive focal power, whose object side surface is convex at the near optical axis and whose image side surface is convex; a seventh lens having negative focal power, whose object side surface is concave at the near optical axis and whose image side surface is concave at the near optical axis. The optical lens provided by the present invention has the advantages of large aperture, large image height, short total length and high resolution quality by rationally matching the focal power and surface shape of each lens.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] At present, with the popularization of portable electronic devices (such as smart phones and cameras) and the popularity of social, video and live broadcast software, people are becoming more and more fond of photography. Optical lenses have become standard for portable electronic devices. Optical lenses have even become the primary consideration for consumers when purchasing portable electronic devices.

[0003] With the continuous development of mobile information technology, consumers are demanding higher and higher image quality from smartphones and other mobile electronic products. These applications are also expanding. They require not only a short overall lens length, a large aperture design to increase light throughput, but also a larger imaging area to increase the number of camera pixels. Therefore, it is necessary to design an optical lens that combines a short overall length, a large aperture, a large image height, and excellent image quality. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an optical lens having the advantages of short total length, large aperture, large image height, and high resolution quality.

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

[0006] The present invention provides an optical lens, which comprises, along the optical axis from the object side to the imaging surface, an aperture; a first lens having positive focal power, wherein the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; a second lens having negative focal 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 having positive focal power, wherein the object-side surface of the third lens is convex at the near optical axis, and the image-side surface of the third lens is convex; a fourth lens having negative focal power, wherein the object-side surface of the fourth lens is concave; a fifth lens having positive focal 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 having positive focal power, wherein the object-side surface of the sixth lens is convex at the near optical axis, and the image-side surface of the sixth lens is convex; a seventh lens having negative focal power, wherein the object-side surface of the seventh lens is concave at the near optical axis, and the image-side surface of the seventh lens is concave at the near optical axis; the optical lens satisfies the following conditional formula: in, represents the optical power of the object-side surface of the sixth lens, represents the refractive power of the image-side surface of the sixth lens.

[0007] The optical lens provided by the present invention, by rationally matching the lens shapes and optical focal lengths of seven lenses with specific refractive powers, achieves high pixel density and large image height while being more compact in structure and having large aperture characteristics, meeting the imaging requirements of darker environments. It achieves a good balance between lens miniaturization and high pixel density, and can effectively enhance the user's camera experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0009] Figure 1 A schematic structural diagram of an optical lens provided in a first embodiment of the present invention;

[0010] Figure 2 1 is a graph showing an axial chromatic aberration curve of the optical lens in the first embodiment of the present invention, wherein the horizontal axis represents the axial chromatic aberration value (unit: mm) and the vertical axis represents the normalized pupil value;

[0011] Figure 3 1 is an optical distortion curve diagram of the optical lens in the first embodiment of the present invention, wherein the horizontal axis represents the distortion percentage and the vertical axis represents the field of view angle (unit: degree);

[0012] Figure 4 Graph showing vertical chromatic aberration of the optical lens in the first embodiment of the present invention, wherein the horizontal axis represents the vertical chromatic aberration value (unit: micrometer) and the vertical axis represents the field of view angle (unit: degree);

[0013] Figure 5 A schematic structural diagram of an optical lens provided in a second embodiment of the present invention;

[0014] Figure 6 is a graph showing an axial chromatic aberration curve of the optical lens in the second embodiment of the present invention;

[0015] Figure 7 is an optical distortion curve diagram of the optical lens in the second embodiment of the present invention;

[0016] Figure 8 is a vertical axis chromatic aberration curve of the optical lens in the second embodiment of the present invention;

[0017] Figure 9 A schematic structural diagram of an optical lens provided in a third embodiment of the present invention;

[0018] Figure 10 Graph showing axial chromatic aberration of the optical lens in the third embodiment of the present invention:

[0019] Figure 11 is an optical distortion curve diagram of the optical lens in the third embodiment of the present invention;

[0020] Figure 12 is a vertical axis chromatic aberration curve of the optical lens in the third embodiment of the present invention;

[0021] Figure 13 A schematic structural diagram of an optical lens provided in a fourth embodiment of the present invention;

[0022] Figure 14 Graph showing axial chromatic aberration of the optical lens in the fourth embodiment of the present invention:

[0023] Figure 15 is an optical distortion curve diagram of the optical lens in the fourth embodiment of the present invention;

[0024] Figure 16 FIG. 4 is a vertical chromatic aberration curve of the optical lens in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the objects, features, and advantages of the present invention more readily apparent, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The accompanying drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. Throughout the specification, the same reference numerals refer to the same elements.

[0027] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] The present invention provides an optical lens, which comprises, in order from the object side to the imaging surface along the optical axis: an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a flat glass;

[0030] The first lens has positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave.

[0031] The second lens has negative optical power, the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave.

[0032] The third lens has positive refractive power, the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex.

[0033] The fourth lens element has negative optical power, and the object side surface of the fourth lens element is concave.

[0034] The fifth lens has positive refractive power, the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is convex.

[0035] The sixth lens element has positive refractive power, the object-side surface of the sixth lens element is convex near the optical axis, and the image-side surface of the sixth lens element is convex.

[0036] The seventh lens element has negative power, the object side surface of the seventh lens element is concave at the near optical axis, and the image side surface of the seventh lens element is concave at the near optical axis.

[0037] Furthermore, the optical lens satisfies the following conditional formula:

[0038]

[0039] in, represents the optical power of the object side of the sixth lens, Represents the focal length of the image side of the sixth lens. The value of makes the optical lens have a larger image height, a larger aperture and a higher imaging quality.

[0040] In some embodiments, the optical lens satisfies the following conditional formula:

[0041] 2 <f3 / f<4;

[0042] Where f3 represents the focal length of the third lens element, and f represents the effective focal length of the optical lens. Meeting the above range provides the third lens element with an appropriately positive focal power, which helps mitigate the degree of deflection of off-axis field light within the third lens element, corrects aberrations in the off-axis field of view, and improves the resolution quality of the optical lens element.

[0043] In some embodiments, the optical lens satisfies the following conditional formula:

[0044] -12 <f4 / f<-7;

[0045] -2 <f4 / f5<-0.1;

[0046] Wherein, f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and f represents the effective focal length of the optical lens. Meeting the above range is conducive to correcting field curvature and improving the resolution quality of the optical lens.

[0047] In some embodiments, the optical lens satisfies the following conditional formula:

[0048] 5 <f5 / f<100;

[0049] Wherein, f5 represents the focal length of the fifth lens element, and f represents the effective focal length of the optical lens element. Meeting the above range enables the fifth lens element to have an appropriate positive focal power, thereby better correcting system aberrations and improving the resolution quality of the optical lens element.

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

[0051] 0.8 <f6 / f<1.25;

[0052] Wherein, f6 represents the focal length of the sixth lens element, and f represents the effective focal length of the optical lens element. Meeting the above range allows the sixth lens element to have an appropriate positive refractive power, which is beneficial for correcting spherical aberration and improving the resolution quality of the optical lens element.

[0053] In some embodiments, the optical lens satisfies the following conditional formula:

[0054] -0.8 <f7 / f<-0.5;

[0055] -0.7 <f7 / f6<-0.4;

[0056] Where f6 represents the focal length of the sixth lens element, f7 represents the focal length of the seventh lens element, and f represents the effective focal length of the optical lens. Meeting the above ranges and properly matching the focal length ratios of the sixth and seventh lenses facilitates correction of higher-order aberrations in the optical lens, resulting in higher pixel-quality imaging for the optical system.

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

[0058] -0.1 <R31 / R32<0;

[0059] -50 <R32 / f<-20;

[0060] Where R31 represents the radius of curvature of the object-side surface of the third lens, R32 represents the radius of curvature of the image-side surface of the third lens, and f represents the effective focal length of the optical lens. Meeting the above ranges allows the third lens to be a biconvex positive lens, which can reduce the degree of curvature of light entering the third lens, facilitating correction of optical distortion in the optical lens and improving overall imaging quality.

[0061] In some embodiments, the optical lens satisfies the following conditional formula:

[0062] -0.8 <R61 / R62<-0.2;

[0063] 0.5 <R61 / f<1.2;

[0064] Wherein, R61 represents the radius of curvature of the object-side surface of the sixth lens element, R62 represents the radius of curvature of the image-side surface of the sixth lens element, and f represents the effective focal length of the optical lens. Meeting the above ranges and rationally controlling the object-side and image-side surface profiles of the sixth lens element facilitates achieving a larger image height, correcting off-axis field curvature, and improving the imaging quality of the optical system.

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

[0066] 0.14 <BFL / TTL<0.16;

[0067] Where BFL represents the distance from the image side of the seventh lens element to the imaging plane on the optical axis. Meeting this range and properly allocating the back focus of the optical system can help reduce the length of the optical system, while also reducing installation interference between the lens and the chip, thereby improving assembly yield.

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

[0069] 10mm<(f×IH) / f1<11.5mm;

[0070] Where f represents the effective focal length of the optical lens, IH represents the true image height corresponding to the maximum field of view of the optical lens, and f1 represents the focal length of the first lens. By properly controlling the value of (f×IH) / f1 within the above range, a larger imaging surface can be achieved. A larger imaging surface potentially provides higher image resolution, allowing the lens to be compatible with higher-pixel chips and achieve high-pixel imaging effects.

[0071] Furthermore, the optical lens satisfies the following conditional formula:

[0072] 1.9 <IH / f<2.1;

[0073] Where IH represents the true image height corresponding to the maximum field of view of the optical lens, and f represents the effective focal length of the optical lens. By properly controlling the value of IH / f within the above range, the imaging surface of the lens can be increased, the overall length of the lens can be shortened, and a balance can be achieved between miniaturization and a large image surface.

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

[0075] 0.21 <CT1 / ∑CT<0.26;

[0076] 0.06 <CT12 / CTb<0.11;

[0077] Where CT1 represents the center thickness of the first lens on the optical axis, ∑CT represents the sum of the center thicknesses of all lenses in the optical lens on the optical axis, CT12 represents the spacing between the first and second lenses on the optical axis, and CTb represents the sum of the air spacings between the seven lenses on the optical axis. Meeting these ranges and rationally allocating the proportion of the center thickness of the first lens to the center thickness of all lenses, as well as the proportion of the spacing between the first and second lenses to the total spacing of all lenses, allows for a more compact distribution of the individual lenses, shortening the overall length of the lens and achieving miniaturization.

[0078] In some embodiments, the optical lens satisfies the following conditional formula:

[0079] 1.6 <IH / TTL<1.7;

[0080] 0.52<∑CT / TTL<0.58;

[0081] Where IH represents the true image height corresponding to the maximum field of view of the optical lens, ∑CT represents the sum of the center thicknesses of all lenses in the optical lens along the optical axis, and TTL represents the total optical length of the optical lens. Meeting the above ranges and rationally allocating the ratio of image height to total length, and the proportion of the center thickness of all lenses in the total length, can help reduce the overall length of the lens while maintaining high imaging quality, thereby achieving miniaturization.

[0082] In some embodiments, the optical lens satisfies the following conditional formula:

[0083] 0.25 <R11 / R12<0.35;

[0084] 0.63 <SAG11 / (CT1+SAG12)<0.68;

[0085] Where R11 represents the radius of curvature of the object-side surface of the first lens element, R12 represents the radius of curvature of the image-side surface of the first lens element, SAG11 represents the sag of the object-side surface of the first lens element, SAG12 represents the sag of the image-side surface of the first lens element, and CT1 represents the center thickness of the first lens element along the optical axis. By meeting the above ranges and properly controlling the surface curvature and sag of the first lens element, it is beneficial to increase the diameter of the entrance pupil, increase the aperture number of the optical system, and achieve large aperture performance.

[0086] In some embodiments, the optical lens satisfies the following conditional formula:

[0087] 2 <R21 / R22<2.5;

[0088] Where R21 represents the radius of curvature of the object-side surface of the second lens, and R22 represents the radius of curvature of the image-side surface of the second lens. Meeting these ranges and properly controlling the surface shape of the second lens facilitates smooth passage of light through the second lens, correcting spherical aberration caused by excessive deflection of light through the first lens, and ultimately improving the imaging quality of the optical system.

[0089] In some embodiments, the optical lens satisfies the following conditional formula:

[0090] 0.8 <R51 / R52<1.3;

[0091] 1.15 <SAG52 / SAG51<1.4;

[0092] Wherein, R51 represents the radius of curvature of the object-side surface of the fifth lens element, R52 represents the radius of curvature of the image-side surface of the fifth lens element, SAG51 represents the sag of the object-side surface of the fifth lens element, and SAG52 represents the sag of the image-side surface of the fifth lens element. Meeting the above ranges and rationally controlling the surface curvature and sag of the fifth lens element can reduce the optical power of the fifth lens element, facilitate smooth passage of light through the fifth lens element, and simultaneously correct aberrations across various fields of view, thereby improving the imaging quality of the optical system.

[0093] In some embodiments, the optical lens satisfies the following conditional formula:

[0094]

[0095] in, represents the optical power of the first lens, represents the optical power of the second lens, represents the optical power of the third lens, Represents the optical power of the fourth lens. Meeting the above range and properly controlling the optical power relationship of the first four lenses can help increase the focal length of the system, expand the imaging area of ​​the optical system, and accommodate chips with larger pixels.

[0096] In some embodiments, the optical lens satisfies the following conditional formula:

[0097] F#<1.8;

[0098] Wherein, F# represents the aperture number of the optical lens. When the above range is met, the aperture of the system can be increased, which is beneficial to increase the amount of light entering the system and improve the sharpness of the captured image.

[0099] In some embodiments, the image side surface of the fourth lens is concave at the optical axis. In other embodiments, the image side surface of the fourth lens is convex at the optical axis. The image side surface of the fourth lens can be configured with different surface shapes to achieve good imaging results.

[0100] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses. Using aspherical lenses can effectively correct aberrations, improve imaging quality, and provide a more cost-effective optical performance product.

[0101] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0102] In various embodiments of the present invention, when the lens is an aspheric lens, the surface shape of the aspheric lens satisfies the following equation:

[0103]

[0104] Among them, z is the distance vector height from the aspheric surface vertex when the aspheric surface is at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the conic coefficient, and A2i is the 2i-order aspheric surface coefficient.

[0105] First embodiment

[0106] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in the first embodiment of the present invention, wherein the optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a flat glass G1.

[0107] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;

[0108] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave;

[0109] The third lens L3 has positive refractive power, the object-side surface S5 of the third lens is convex at the near optical axis, and the image-side surface S6 of the third lens is convex;

[0110] The fourth lens L4 has negative optical power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is concave near the optical axis;

[0111] The fifth lens L5 has positive refractive power, the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex;

[0112] The sixth lens L6 has positive refractive 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 convex;

[0113] The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens is concave at the near optical axis, and the image-side surface S14 of the seventh lens is concave at the near optical axis.

[0114] The object side surface of the plate glass G1 is S15 and the image side surface is S16.

[0115] 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.

[0116] Table 1 shows the parameters of each lens in the optical lens 100 provided in the first embodiment of the present invention.

[0117] Table 1

[0118]

[0119] The surface coefficients of the aspheric surfaces of the optical lens 100 in this embodiment are shown in Table 2.

[0120] Table 2

[0121]

[0122] In this embodiment, the graphs of axial chromatic aberration, optical distortion and vertical chromatic aberration of the optical lens 100 are as follows: Figure 2 、 Figure 3 and Figure 4 shown.

[0123] Figure 2 The axial chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of different wavelengths in the optical axis direction. It can be seen from the figure that the axial chromatic aberration of different wavelengths is controlled within ±0.035mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected.

[0124] Figure 3 The optical F-Tan(θ) distortion curve of the optical lens 100 of this embodiment is shown, which represents the distortion at different image heights on the imaging plane. It can be seen from the figure that the optical distortion is controlled within 2%, indicating that the distortion of the optical lens 100 is well corrected.

[0125] Figure 4 The vertical chromatic aberration curve of the optical lens 100 of this embodiment is shown, which represents the vertical chromatic aberration values ​​between light of different wavelengths and the main wavelength. It can be seen from the figure that the vertical chromatic aberration values ​​of different wavelengths are within ±2μm, indicating that the vertical chromatic aberration of the optical lens 100 is well corrected.

[0126] Second embodiment

[0127] See also Figure 5 , shown is a structural schematic diagram of the optical lens 200 provided in the second embodiment of the present invention. The optical lens 200 of this embodiment is substantially the same as the first embodiment described above, with the main differences being that the image side surface S8 of the fourth lens is convex at the near optical axis, and the curvature radius, lens thickness, spacing, etc. of each lens surface are different.

[0128] Table 3 shows the parameters of each lens in the optical lens 200 provided in the second embodiment of the present invention.

[0129] Table 3

[0130]

[0131]

[0132] The surface coefficients of the aspheric surfaces of the optical lens 200 in this embodiment are shown in Table 4.

[0133] Table 4

[0134]

[0135] In this embodiment, the graphs of axial chromatic aberration, optical distortion and vertical chromatic aberration of the optical lens 200 are as follows: Figure 6 、 Figure 7 and Figure 8 As shown. Figure 6 It can be seen that the axial chromatic aberration of all wavelengths is controlled within ±0.04mm, indicating that the axial chromatic aberration of the optical lens 200 is well corrected. Figure 7It can be seen that the optical distortion is controlled within 2%, indicating that the distortion of the optical lens 200 is well corrected. Figure 8 It can be seen that the vertical chromatic aberration value of each wavelength is within ±2μm, indicating that the vertical chromatic aberration of the optical lens 200 is well corrected.

[0136] Third embodiment

[0137] See also Figure 9 , shown is a structural schematic diagram of the optical lens 300 provided in the third embodiment of the present invention. The optical lens 300 of this embodiment is roughly the same as the above-mentioned first embodiment. The main difference lies in the differences in the curvature radius, lens thickness, spacing, etc. of each lens surface.

[0138] Table 5 shows the parameters of each lens in the optical lens 300 provided in the third embodiment of the present invention.

[0139] Table 5

[0140]

[0141] The surface coefficients of the aspheric surfaces of the optical lens 300 in this embodiment are shown in Table 6.

[0142] Table 6

[0143]

[0144] In this embodiment, the graphs of axial chromatic aberration, optical distortion and vertical chromatic aberration of the optical lens 300 are as follows: Figure 10 、 Figure 11 and Figure 12 As shown. Figure 10 It can be seen that the axial chromatic aberration of all wavelengths is controlled within ±0.035mm, indicating that the axial chromatic aberration of the optical lens 300 is well corrected. Figure 11 It can be seen that the optical distortion is controlled within 2.0%, indicating that the distortion of the optical lens 300 is well corrected. Figure 12 It can be seen that the vertical chromatic aberration value of each wavelength is within ±2μm, indicating that the vertical chromatic aberration of the optical lens 300 is well corrected.

[0145] Fourth embodiment

[0146] See also Figure 13 , shown is a structural schematic diagram of the optical lens 400 provided in the fourth embodiment of the present invention. The optical lens 400 of this embodiment is roughly the same as the above-mentioned first embodiment. The main difference lies in the differences in the curvature radius, lens thickness, spacing, etc. of each lens surface.

[0147] Table 7 shows the parameters of each lens in the optical lens 400 provided in the fourth embodiment of the present invention.

[0148] Table 7

[0149]

[0150] The surface coefficients of the aspheric surfaces of the optical lens 400 in this embodiment are shown in Table 8.

[0151] Table 8

[0152]

[0153] In this embodiment, the graphs of axial chromatic aberration, optical distortion and vertical chromatic aberration of the optical lens 400 are as follows: Figure 14 、 Figure 15 and Figure 16 As shown. Figure 14 It can be seen that the axial chromatic aberration of all wavelengths is controlled within ±0.06mm, indicating that the axial chromatic aberration of the optical lens 400 is well corrected. Figure 15 It can be seen that the optical distortion is controlled within 2%, indicating that the distortion of the optical lens 400 is well corrected. Figure 16 It can be seen that the vertical chromatic aberration value of each wavelength is within ±2μm, indicating that the vertical chromatic aberration of the optical lens 400 is well corrected.

[0154] Table 9 shows the optical characteristics corresponding to the above four embodiments, mainly including the system's effective focal length f, aperture number F#, total optical length TTL, maximum field of view angle 2θ and its corresponding image height IH, as well as the numerical values ​​corresponding to each of the above conditional expressions.

[0155] Table 9

[0156]

[0157]

[0158] In summary, the optical lens provided by the present invention uses seven lenses with specific optical powers. Through the combination of specific surface shapes and reasonable optical power distribution, the lens has a relatively compact structure, realizing the miniaturization of the lens. At the same time, the lens also has a large aperture to meet the imaging requirements of light and dark environments. Moreover, the image height of the lens reaches more than 10.7mm, meeting the requirements of a large image surface and high pixels, and can match a 1 / 1.56-inch CMOS chip for clear imaging. Therefore, the optical lens provided by the present invention has the advantages of a large aperture, a large image height, a short total length, and high resolution quality.

[0159] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0160] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the image side, it includes: Aperture; a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; a second lens having negative 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 having positive refractive power, wherein the object-side surface of the third lens is convex at the near optical axis, and the image-side surface of the third lens is convex; a fourth lens having negative optical power, wherein the object-side surface of the fourth lens is concave; a fifth lens having 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 having positive refractive power, wherein the object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is convex; a seventh lens element having negative optical power, wherein the object-side surface of the seventh lens element is concave at the near optical axis, and the image-side surface of the seventh lens element is concave at the near optical axis; The optical lens satisfies the following conditional formula: 10mm<(f×IH) / f1<11.5mm; in, represents the optical power of the object-side surface of the sixth lens, represents the optical power of the image-side surface of the sixth lens, f represents the effective focal length of the optical lens, IH represents the real image height corresponding to the maximum field angle of the optical lens, and f1 represents the focal length of the first lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 2 <f3 / f<4; Wherein, f3 represents the focal length of the third lens, and f represents the effective focal length of the optical lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -12 <f4 / f<-7; -2 <f4 / f5<-0.1; Wherein, f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and f represents the effective focal length of the optical lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 5 <f5 / f<100; Wherein, f5 represents the focal length of the fifth lens, and f represents the effective focal length of the optical lens.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.8 <f6 / f<1.25; Wherein, f6 represents the focal length of the sixth lens, and f represents the effective focal length of the optical lens.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -0.8 <f7 / f<-0.5; -0.7 <f7 / f6<-0.4; Wherein, f6 represents the focal length of the sixth lens, f7 represents the focal length of the seventh lens, and f represents the effective focal length of the optical lens.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -0.1 <R31 / R32<0; -50 <R32 / f<-20; Wherein, R31 represents the curvature radius of the object side surface of the third lens, R32 represents the curvature radius of the image side surface of the third lens, and f represents the effective focal length of the optical lens.

8. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -0.8 <R61 / R62<-0.2; 0.5 <R61 / f<1.2; Wherein, R61 represents the curvature radius of the object-side surface of the sixth lens, R62 represents the curvature radius of the image-side surface of the sixth lens, and f represents the effective focal length of the optical lens.

9. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.14 <BFL / TTL<0.16; Wherein, BFL represents the distance from the image side surface of the seventh lens to the imaging surface on the optical axis, and TTL represents the total optical length of the optical lens.

10. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 1.9 <IH / f<2.1; Wherein, IH represents the real image height corresponding to the maximum field angle of the optical lens, and f represents the effective focal length of the optical lens.

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