Optical lens

Abstract

The invention provides an optical lens. From an object side to an imaging surface along an optical axis, the optical lens comprises a variable aperture diaphragm; the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface near the optical axis, and the image side surface of the fourth lens is a concave surface near the optical axis; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface near the optical axis, and the image side surface of the sixth lens is a concave surface near the optical axis; and the object side surface of the seventh lens is a convex surface near the optical axis, and the image side surface of the seventh lens is a concave surface near the optical axis. According to the optical lens provided by the invention, the imaging quality of the optical lens can be improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

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] In recent years, with the development of camera technology, the application scope of electronic devices equipped with optical lenses has become wider, such as mobile phones, tablets, laptops, and head-mounted display devices, and the requirements for optical lenses have also become more diverse. In order to allow users to have a better photo-taking experience and realize optical lenses in different scenes and requirements, optical lenses are required to have variable aperture functions and good imaging quality.

[0003] However, the design of the variable aperture and the combination of multiple lenses will result in a larger optical lens, which is difficult to meet the needs of using in lightweight and miniaturized electronic devices. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization.

[0005] The technical solution adopted by the present invention is:

[0006] An optical lens, composed of seven lenses, including the following lenses in order from the object side to the imaging surface along the optical axis:

[0007] Variable aperture diaphragm, used to adjust the aperture size;

[0008] The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave;

[0009] The second lens has a negative optical power, its object side surface is convex, and its image side surface is concave;

[0010] The third lens has positive power, its object side surface is convex, and its image side surface is convex;

[0011] a fourth lens element having negative optical power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis;

[0012] a fifth lens having positive refractive power, whose object side surface is concave and whose image side surface is convex;

[0013] a sixth lens having positive refractive power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis;

[0014] The seventh lens element has a negative optical power, the object side surface of which is convex at the near optical axis, and the image side surface of which is concave at the near optical axis;

[0015] Wherein, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum aperture value Fno of the optical lens max and the minimum aperture value Fno of the optical lens min satisfy: 4.8mm < IH / (Fno max - Fno min ) < 5mm.

[0016] Further preferably, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.69 < TTL / IH < 0.72.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.18 < f1 / f < 1.28; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2.9 < f2 / f < -2.7.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.9 < f3 / f < 2.1; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f3 / f4 < -0.15.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -13.5 < f4 / f < -9.5; the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 1.3 < R7 / R8 < 1.5.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 2.6.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 20 < f6 / f < 90.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1.1 < f7 / f < -0.9.

[0023] Further preferably, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.75 < f12 / f < 1.93.

[0024] Further preferably, the effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 1.2 < f345 / f < 1.4.

[0025] Further preferably, the effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.2 <f67 / f<-1。

[0026] Compared with the prior art, the optical lens provided by the present invention adopts a variable aperture diaphragm and seven lenses with specific optical focal lengths. Through specific surface shape matching and reasonable optical focal length distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0029] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0030] Figure 3 4 is a F-Tan(θ) distortion curve of the optical lens in Example 1 of the present invention.

[0031] Figure 4 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0033] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Figure 7 It is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0035] Figure 8 4 is a F-Tan(θ) distortion curve of the optical lens in Example 2 of the present invention.

[0036] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0037] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0038] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0039] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0040] Fig.13 4 is a F-Tan(θ) distortion curve of the optical lens in Example 3 of the present invention.

[0041] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0042] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0043] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0044] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0045] Fig.18 4 is a F-Tan(θ) distortion curve of the optical lens in Example 4 of the present invention.

[0046] Fig.19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0047] Fig. 20 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0048] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0049] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0051] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0052] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0053] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0054] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0055] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0056] The optical lens provided by the embodiment of the present invention is composed of seven lenses, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the imaging surface along the optical axis.

[0057] The optical lens provided by the embodiment of the present application further includes a diaphragm, and the diaphragm is a variable-aperture diaphragm for controlling the amount of incident light and adjusting the aperture size of the optical lens. By adjusting the distance CTst between the diaphragm and the object side of the first lens on the optical axis and the aperture size (opening size) of the diaphragm, the diaphragm has different states, so that the optical lens has different aperture values, realizing adjustable aperture. Specifically, the diaphragm is arranged on one side of the object side of the first lens, which is beneficial to adjusting the amount of incident light of the system on the light incident side of the lens and avoiding interference with other components when adjusting the aperture size and position of the diaphragm.

[0058] In some embodiments, the first lens may have a positive focal power, its object side is convex, and its image side is concave. The second lens may have a negative focal power, its object side is convex, and its image side is concave. The third lens may have a positive focal power, its object side is convex, and its image side is convex. The fourth lens may have a negative focal power, its object side is convex near the optical axis, and its image side is concave near the optical axis. The fifth lens may have a positive focal power, its object side is concave, and its image side is convex. The sixth lens may have a positive focal power, its object side is convex near the optical axis, and its image side is concave near the optical axis. The seventh lens may have a negative focal power, its object side is convex near the optical axis, and its image side is concave near the optical axis.

[0059] In some embodiments, the optical lens may further include a filter, and the filter may be arranged between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0060] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens, the maximum aperture value Fno of the optical lens max and the minimum aperture value Fno of the optical lens min satisfy: 4.8mm < IH / (Fno max - Fno min ) < 5mm. Meeting the above conditions enables the optical lens to have a larger image plane, and at the same time, the aperture value of the lens is maintained within a reasonable range, realizing the effects of higher pixel and adjustable aperture of the lens.

[0061] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.69 < TTL / IH < 0.72. Meeting the above conditions can better realize the miniaturization of the lens. At the same time, when ensuring the same total length of the lens, it has a larger image plane and can match a larger-sized imaging chip to achieve high-definition imaging.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.18 < f1 / f < 1.28. Meeting the above conditions can endow the first lens with a large positive refractive power, which is conducive to converging the light incident on the optical system from the first lens to a greater extent, facilitating the realization of a large field of view angle and a large aperture of the system.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2.9 < f2 / f < -2.7. Meeting the above conditions can diverge a wide range of light entering the system to a certain extent, which is conducive to avoiding excessive light deflection caused by the overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.9 < f3 / f < 2.1. Meeting the above conditions is conducive to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0065] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f3 / f4 < -0.15. Meeting the above conditions is conducive to the smooth transition of light, while correcting various aberrations of the optical lens and improving the imaging quality of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -13.5 < f4 / f < -9.5; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.3 < R7 / R8 < 1.5. Meeting the above conditions is conducive to diverging the light converged by the third lens, balancing the aberrations of the optical lens, and improving the imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 2.6. Meeting the above conditions is conducive to converging the diverging light to the rear optical system, shortening the optical path of the peripheral light reaching the imaging surface, effectively shortening the total length, and improving the resolution quality at the same time.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 20 < f6 / f < 90. Meeting the above conditions is conducive to the gentle convergence of light, shortening the distance to the next lens, and facilitating the reduction of the total length of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1.1 < f7 / f < -0.9. Meeting the above conditions is conducive to diverging the incident light, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, and better realizing large target surface imaging of the lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.75 < f12 / f < 1.93. Meeting the above conditions is conducive to the convergence of light, enabling the light entering the system at the front end to smoothly enter the rear optical system, making the overall optical path more gentle, optimizing aberration, and improving resolution.

[0071] In some embodiments, the effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 1.2 < f345 / f < 1.4. Meeting the above conditions is conducive to the light entering the subsequent system more gently, reducing the tolerance sensitivity of the optical system.

[0072] In some embodiments, the effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.2 < f67 / f < -1. Meeting the above conditions can diverge the incident light to a certain extent, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, thereby realizing large target surface imaging of the lens.

[0073] In some embodiments, the overall optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: 0.1 < BFL / TTL < 0.2; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.1 < BFL / f < 0.2. Meeting the above conditions can make the lens have an appropriate back focus, ensuring the compatibility between the lens and the fuselage while making the structure of the lens more compact.

[0074] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.2 < TTL / f < 1.4. Meeting the above conditions can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens.

[0075] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.9. Meeting the above conditions can not only achieve wide-angle characteristics to meet the large-range shooting requirements, but also achieve large image surface characteristics to improve the imaging quality of the optical lens.

[0076] In some embodiments, the effective focal length f of the optical lens and the image-side curvature radius R12 of the sixth lens satisfy: 0.72 < R12 / f < 0.8; the effective focal length f of the optical lens and the object-side curvature radius R13 of the seventh lens satisfy: R13 / f > 2. By satisfying the above conditions, by adopting a convex-concave surface design for the sixth lens, the transmittance of light is improved, and it can be better combined with the seventh lens to correct aberrations and improve the overall imaging quality.

[0077] In some embodiments, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -88 < f6 / f7 < -20. By satisfying the above conditions, the angle of incidence of the marginal field of view on the imaging surface can be appropriately suppressed, and more light beams can be effectively transmitted to the imaging surface, improving the relative illumination of the optical lens.

[0078] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.7 < IH / EPD < 7.6. By satisfying the above conditions, while the lens has a large image surface, it has a large adjustable range of the aperture, and the balance of a large target surface and adjustable aperture can be achieved.

[0079] In some embodiments, the aperture value Fno of the optical lens satisfies: 1.4 < Fno ≤ 4. By satisfying the above conditions, the optical lens has an F1.4-2.0-4.0 variable aperture.

[0080] In some embodiments, the optical lens satisfies the conditional formula: 6.5mm < f < 6.65mm, 1.6mm < EPD < 4.6mm, 8.5mm < TTL < 9mm, 80° < FOV < 90°, 12mm < IH < 12.5mm; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the overall optical length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. By satisfying the above conditions, it shows that the optical lens provided by the embodiments of the present invention has at least the characteristics of adjustable entrance pupil diameter, miniaturization, and large field of view angle.

[0081] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. All the lenses in the optical lens provided by the present invention are plastic lenses.

[0082] 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 may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention may all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses.

[0083] 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:

[0084]

[0085] Where z is the distance vector height from the vertex of the aspheric surface 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 quadratic surface coefficient, and A 2i is the 2i-th order aspheric surface coefficient.

[0086] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection 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 other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0087] Example 1

[0088] See also Figure 1 , shown is a schematic diagram of the structure of the optical lens 100 provided in Example 1 of the present invention, and 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 filter G1.

[0089] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0090] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0091] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex;

[0092] The fourth lens L4 has negative refractive power, an object-side surface S7 thereof is convex at the near optical axis, and an image-side surface S8 thereof is concave at the near optical axis;

[0093] The fifth lens L5 has positive refractive power, its object-side surface S9 is concave, and its image-side surface S10 is convex;

[0094] The sixth lens L6 has positive refractive power, an object-side surface S11 thereof is convex at the near optical axis, and an image-side surface S12 thereof is concave at the near optical axis;

[0095] The seventh lens L7 has negative refractive power, an object-side surface S13 thereof is convex at the near optical axis, and an image-side surface S14 thereof is concave at the near optical axis;

[0096] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0097] The imaging surface S17 is a plane.

[0098] 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.

[0099] The diaphragm ST is a variable aperture diaphragm, which is disposed on the object side of the first lens L1 and is used to control the amount of light entering and adjust the aperture size of the optical lens. By adjusting the distance CTst between the diaphragm and the object side of the first lens on the optical axis and the opening size of the diaphragm ST, the diaphragm ST can have different states, thereby making the optical lens have different aperture values.

[0100] Specifically, in this embodiment, the adjustment range of the distance CTst between the aperture and the object side of the first lens on the optical axis is -0.707 to 0.300 mm, the EPD range is 1.646 to 4.419 mm, and the Fno range is 1.49 to 4.0. As shown in Tables 1-3, when the aperture ST is in three different states, the optical lens 100 can have different aperture values. It is understood that the aperture ST includes but is not limited to these three states.

[0101] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0102] Table 1-1

[0103]

[0104] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0105] Table 1-2

[0106]

[0107]

[0108] The corresponding parameters of the optical lens 100 in Example 1 under different aperture states are shown in Tables 1-3.

[0109] Table 1-3

[0110] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.490 2.000 4.000 CTst(mm) -0.707 0.300 0.300 EPD(mm) 4.419 3.292 1.646

[0111] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which indicates the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.2mm, indicating that the optical lens 100 can correct the field curvature well.

[0112] Figure 3 The F-Tan (θ) distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the distortion value is controlled within 0 to 3%, indicating that the optical lens 100 can correct the distortion well.

[0113] Figure 4 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.05mm, indicating that the optical lens 100 can correct the axial aberration well.

[0114] Figure 5 The vertical axis chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.51 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0115] Example 2

[0116] See also Figure 6, shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0117] In this embodiment, the adjustment range of the distance CTst between the aperture and the object side of the first lens on the optical axis is -0.687 to 0.300 mm, the EPD range is 1.648 to 4.424 mm, and the Fno range is 1.49 to 4.0. As shown in Table 2-3, when the aperture ST is in three different states, the optical lens 200 can have different aperture values. It is understandable that the aperture ST includes but is not limited to these three states.

[0118] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0119] Table 2-1

[0120]

[0121] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0122] Table 2-2

[0123] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> S1 9.72E-01 -2.76E-03 1.71E-04 -7.73E-05 -2.36E-05 S2 -9.64E+01 -2.82E-03 1.45E-03 2.29E-05 -8.48E-05 S3 1.61E+00 -1.94E-02 -3.90E-04 5.72E-04 -1.33E-04 S4 -4.39E+00 4.64E-03 -6.58E-03 1.74E-03 -2.16E-04 S5 1.48E+00 3.97E-03 -2.26E-03 -3.61E-04 5.74E-05 S6 2.56E+01 -7.15E-03 -3.35E-05 -1.68E-04 5.75E-05 S7 7.48E+01 -2.76E-02 -9.01E-04 3.95E-04 1.94E-04 S8 -4.17E+01 -1.32E-02 -2.97E-03 8.54E-04 -6.48E-06 S9 -7.61E+01 -1.54E-03 -2.28E-03 2.58E-04 -1.34E-04 S10 2.18E+00 7.21E-04 2.73E-04 -5.18E-05 -1.56E-05 S11 -2.80E+00 -2.56E-02 2.97E-03 -7.08E-04 1.41E-04 S12 -1.17E+01 -1.27E-02 4.38E-04 -2.03E-05 1.31E-05 S13 3.02E+01 -4.38E-02 4.84E-03 -1.53E-04 -2.21E-05 S14 -7.24E+00 -1.80E-02 2.15E-03 -1.64E-04 6.31E-06 Face number <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 5.22E-06 3.64E-07 -5.06E-08 2.03E-09 -2.23E-10 S2 1.94E-05 -1.47E-07 3.75E-08 -4.59E-08 3.24E-09 S3 2.40E-05 -2.51E-06 -4.05E-08 2.39E-08 -3.03E-09 S4 3.66E-06 2.59E-06 6.94E-07 9.07E-08 -1.78E-08 S5 4.03E-06 3.46E-06 5.19E-07 7.68E-08 -5.81E-08 S6 1.64E-05 -4.19E-06 7.51E-08 -3.03E-08 -3.47E-09 S7 -2.01E-05 -7.07E-06 9.21E-07 2.03E-07 -2.28E-08 S8 -4.31E-06 3.22E-07 -1.50E-07 -1.29E-07 5.18E-08 S9 -6.81E-06 5.02E-06 -6.22E-07 5.93E-08 -2.56E-09 S10 -5.71E-07 -1.27E-07 6.58E-09 1.14E-08 1.65E-09 S11 -2.40E-05 1.95E-06 -5.81E-08 2.01E-10 1.41E-10 S12 -4.47E-06 4.94E-07 -1.93E-08 2.46E-11 7.42E-12 S13 3.16E-06 -1.56E-07 2.41E-09 -1.29E-11 9.27E-13 S14 -8.53E-08 -8.77E-10 2.88E-11 -7.68E-13 2.27E-14

[0124] The corresponding parameters of the optical lens 200 in Example 2 under different aperture states are shown in Table 2-3.

[0125] Table 2-3

[0126] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.490 2.000 4.000 CTst(mm) -0.687 0.300 0.300 EPD(mm) 4.424 3.296 1.648

[0127] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0128] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.3mm, indicating that the optical lens 200 can correct the field curvature well.

[0129] from Figure 8 It can be seen that the distortion value is controlled within ±3%, indicating that the optical lens 200 can correct the distortion well.

[0130] from Fig. 9It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0131] from Fig.10 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0132] Example 3

[0133] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0134] In this embodiment, the adjustment range of the distance CTst between the aperture and the object side of the first lens on the optical axis is -0.703 to 0.300 mm, the EPD range is 1.635 to 4.449 mm, and the Fno range is 1.47 to 4.0. As shown in Table 3-3, when the aperture ST is in three different states, the optical lens 300 can have different aperture values. It is understandable that the aperture ST includes but is not limited to these three states.

[0135] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0136] Table 3-1

[0137]

[0138]

[0139] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0140] Table 3-2

[0141] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> S1 9.68E-01 -2.74E-03 1.65E-04 -8.52E-05 -2.43E-05 S2 -8.81E+01 -2.73E-03 1.49E-03 3.17E-05 -8.43E-05 S3 1.64E+00 -1.93E-02 -3.26E-04 5.78E-04 -1.34E-04 S4 -4.41E+00 4.69E-03 -6.58E-03 1.72E-03 -2.17E-04 S5 2.74E+01 4.52E-03 -2.29E-03 -3.39E-04 6.47E-05 S6 2.37E+01 -6.47E-03 6.76E-05 -1.43E-04 5.73E-05 S7 7.88E+01 -2.76E-02 -7.60E-04 3.97E-04 1.93E-04 S8 -3.97E+01 -1.29E-02 -3.01E-03 8.79E-04 -3.37E-07 S9 -7.31E+01 -8.82E-04 -2.14E-03 2.64E-04 -1.36E-04 S10 2.26E+00 1.39E-03 3.70E-04 -2.12E-05 -1.01E-05 S11 -2.55E+00 -2.49E-02 3.05E-03 -7.06E-04 1.40E-04 S12 -1.29E+01 -1.17E-02 4.63E-04 -2.15E-05 1.29E-05 S13 2.06E+01 -4.40E-02 4.84E-03 -1.53E-04 -2.22E-05 S14 -7.95E+00 -1.82E-02 2.16E-03 -1.64E-04 6.31E-06 Face number <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 5.56E-06 4.61E-07 -3.81E-08 1.50E-09 -8.04E-10 S2 1.95E-05 -5.52E-08 6.23E-08 -4.34E-08 1.55E-09 S3 2.38E-05 -2.52E-06 -3.33E-08 2.60E-08 -3.23E-09 S4 3.73E-06 2.51E-06 6.90E-07 9.00E-08 -1.20E-08 S5 4.37E-06 3.20E-06 4.82E-07 7.71E-08 -5.58E-08 S6 1.56E-05 -4.41E-06 3.89E-08 -3.18E-08 -2.88E-09 S7 -1.99E-05 -7.11E-06 9.09E-07 2.04E-07 -1.79E-08 S8 -5.29E-06 -3.77E-07 -2.79E-07 -1.18E-07 6.58E-08 S9 -6.53E-06 5.39E-06 -5.20E-07 5.44E-08 -1.65E-08 S10 -2.17E-07 -1.89E-07 -2.12E-08 8.10E-09 2.36E-09 S11 -2.41E-05 1.95E-06 -5.91E-08 -2.13E-11 9.87E-11 S12 -4.48E-06 4.94E-07 -1.93E-08 2.44E-11 6.70E-12 S13 3.15E-06 -1.56E-07 2.38E-09 -1.16E-11 1.46E-12 S14 -8.54E-08 -8.82E-10 2.85E-11 -7.70E-13 2.26E-14

[0142] The corresponding parameters of the optical lens 300 in Example 3 under different aperture states are shown in Table 3-3.

[0143] Table 3-3

[0144]

[0145]

[0146] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0147] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the field curvature well.

[0148] from Fig.13 It can be seen that the distortion value is controlled within 0-2%, indicating that the optical lens 300 can correct the distortion well.

[0149] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0150] from Fig.15 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0151] Example 4

[0152] See also Fig.16 , shown is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0153] In this embodiment, the adjustment range of the distance CTst between the aperture and the object side of the first lens on the optical axis is -0.632 to 0.300 mm, the EPD range is 1.645 to 4.416 mm, and the Fno range is 1.49 to 4.0. As shown in Table 4-3, when the aperture ST is in three different states, the optical lens 400 can have different aperture values. It is understandable that the aperture ST includes but is not limited to these three states.

[0154] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0155] Table 4-1

[0156]

[0157]

[0158] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0159] Table 4-2

[0160]

[0161]

[0162] The corresponding parameters of the optical lens 400 in Example 4 under different aperture states are shown in Table 4-3.

[0163] Table 4-3

[0164] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.490 2.000 4.000 CTst(mm) -0.632 0.300 0.300 EPD(mm) 4.416 3.290 1.645

[0165] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 , Fig. 20 shown.

[0166] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the field curvature well.

[0167] from Fig.18 It can be seen that the distortion value is controlled within 0-3%, indicating that the optical lens 400 can correct the distortion well.

[0168] from Fig.19 It can be seen that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0169] from Fig. 20 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0170] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0171] Table 5

[0172]

[0173]

[0174] In summary of the above embodiments, the optical lens provided by the present invention adopts a variable aperture diaphragm and seven lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it is possible to improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization.

[0175] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0176] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, consisting of seven lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A variable aperture stop for adjusting the aperture size; A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with positive optical power, whose object side is convex and whose image side is convex; A fourth lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fifth lens with positive optical power, whose object side is concave and whose image side is convex; A sixth lens with positive optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A seventh lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; Among them, the real image height IH corresponding to the maximum field angle of the optical lens, the maximum aperture value Fno of the optical lens max The minimum aperture value Fno of the optical lens min Meet: 4.8mm <IH / (Fno max -Fno min )<5mm.

2. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.69 < TTL / IH < 0.

72.

3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.18 < f1 / f < 1.28; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2.9 < f2 / f < -2.

7.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.9 < f3 / f < 2.1; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f3 / f4 < -0.

15.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -13.5 < f4 / f < -9.5; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.3 < R7 / R8 < 1.

5.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 2.

6.

7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 20 < f6 / f < 90.

8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1.1 < f7 / f < -0.

9.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.75 < f12 / f < 1.

93.

10. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 1.2 < f345 / f < 1.

4.

11. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.2 < f67 / f < -1.

Images