Optical lens

Abstract

The application provides an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a variable aperture diaphragm, a first lens with positive refractive power, whose object side is convex and whose image side is concave, a second lens with negative refractive power, whose object side is convex and whose image side is concave, a third lens with positive refractive power, whose object side is convex and whose image side is convex, a fourth lens with negative refractive 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 refractive power, whose object side is concave and whose image side is convex, a sixth lens with positive refractive power, whose object side is convex near the optical axis and whose image side is concave near the optical axis, and a seventh lens with negative refractive power, whose object side is convex near the optical axis and whose image side is concave near the optical axis. The optical lens can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, and particularly to an optical lens. BACKGROUND

[0002] In recent years, with the development of camera technology, the application range of electronic devices equipped with optical lenses is more extensive, such as mobile phones, tablets, notebook computers, and head-mounted display devices, and the requirements for optical lenses are also more diversified. In order to enable users to have a better shooting experience, the optical lens is required to have the function of variable aperture and good imaging quality to realize shooting in different scenes and needs.

[0003] However, the design of variable aperture and the combination of multiple lenses can result in a large size of the optical lens, which is difficult to meet the use requirements of portable and miniaturized electronic devices. SUMMARY

[0004] In view of the above problems, the present application aims to provide an optical lens with one or more advantages of large aperture, adjustable aperture, large target surface, miniaturization, etc.

[0005] The technical scheme adopted by the present application is as follows:

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

[0007] A variable aperture diaphragm for adjusting the aperture size;

[0008] A first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave;

[0009] A second lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave;

[0010] A third lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex;

[0011] A fourth lens with negative refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

[0012] A fifth lens with positive refractive power, the object side surface of which is concave, and the image side surface of which is convex;

[0013] A sixth lens with positive refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

[0014] A seventh lens with negative refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

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

[0016] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of view 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 radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side 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 existing technologies, the optical lens provided by this invention adopts a variable aperture stop and seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization. Attached Figure Description

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

[0028] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

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

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

[0031] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

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

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

[0036] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0038] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 12 Field curvature curve of the optical lens in Embodiment 3 of the present application.

[0040] Figure 13 F-Tan(θ) distortion curve of the optical lens in Embodiment 3 of the present application.

[0041] Figure 14 Axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 15 Vignetting curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 16 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0044] Figure 17 Field curvature curve of the optical lens in Embodiment 4 of the present application.

[0045] Figure 18 F-Tan(θ) distortion curve of the optical lens in Embodiment 4 of the present application.

[0046] Figure 19 Axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0047] Figure 20 Vignetting curve of the optical lens in Embodiment 4 of the present application.

[0048] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0049] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like 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 the present specification, the expressions first, second, third and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

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

[0052] In this document, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, 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 specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0053] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean the presence of stated features, elements, and / or components but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0055] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

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

[0057] The optical lens provided by the embodiment of the present application further includes an aperture stop. The aperture stop is a variable-aperture stop, which is used to control the amount of incident light and adjust the aperture size of the optical lens. By adjusting the distance CTst between the aperture stop and the object side of the first lens on the optical axis and the aperture size (opening size) of the aperture stop, the aperture stop has different states, so that the optical lens has different aperture values, realizing adjustable aperture. Specifically, the aperture stop 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 aperture stop.

[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, which may be arranged between the seventh lens and the imaging surface. The filter is used to filter out interfering light and 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 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, while maintaining the aperture value of the lens within a reasonable range, achieving 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 angle of the optical lens satisfy: 0.69 < TTL / IH < 0.72. Meeting the above conditions can better achieve the miniaturization of the lens, and at the same time ensure that the lens has a larger image plane under the condition of the same total length, 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. Satisfying the above condition, the first lens has a large positive refractive power, which is conducive to a large degree of convergence of light rays from the first lens to the optical system, facilitating the realization of a large field 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. Satisfying the above condition, a large range of light rays entering the system is diverged to a certain extent, which is conducive to avoiding excessive deflection of light rays caused by the light power of the first lens being too concentrated, and reducing the difficulty of correcting aberration.

[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. Satisfying the above condition is conducive to smooth transition of light rays, 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. Satisfying the above condition is conducive to smooth transition of light rays, 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. Satisfying the above condition is conducive to diverging the light rays converged by the third lens, balancing the aberration 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. Satisfying the above condition is conducive to converging the diverging light rays to the rear optical system, which can shorten the optical path of the peripheral light rays to the imaging surface, effectively shorten the total length, and improve the resolution quality.

[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. Satisfying the above condition is conducive to gently converging light rays, which can shorten the distance to the next lens, and is conducive to reducing 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. Satisfying the above condition is conducive to diverging the incident light, making the peripheral light and the central light turn upward to reach a higher imaging position, and better achieving 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. Satisfying the above condition is conducive to converging the light, making the light entering the system from the front smoothly enter the rear optical system, making the overall light path more gentle, and optimizing the aberration and improving the 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. Satisfying the above condition 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. Satisfying the above condition can diverge the incident light to a certain extent, making the peripheral light and the central light turn upward to reach a higher imaging position, thereby achieving large target surface imaging of the lens.

[0073] In some embodiments, the total 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. Satisfying the above condition can make the lens have a suitable back focus, ensure the compatibility of the lens and the body, and make the structure of the lens more compact.

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

[0075] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.9. Satisfying the above condition can achieve wide-angle characteristics to meet the demand for wide-range shooting, and can 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 radius of curvature 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 radius of curvature R13 of the seventh lens satisfy: R13 / f > 2. By satisfying the above conditions, the transmittance of light is improved by adopting the convex-concave surface design of the sixth lens, the aberration is better corrected in cooperation with the seventh lens, and the overall imaging quality is improved.

[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 the edge field of view incident on the imaging surface is appropriately suppressed, more light beams are effectively transmitted to the imaging surface, and the relative luminance of the optical lens is improved.

[0078] In some embodiments, the real image height IH corresponding to the maximum field angle of view 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, the lens has a larger image surface while having a larger aperture adjustment range, and the balance of a large target surface and an 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 a variable aperture of F1.4-2.0-4.0.

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

[0081] In some embodiments, the material of the lens in the optical lens provided in the present application can be glass or plastic. When the material of the lens is plastic, the production cost can be effectively reduced. When the material of the lens is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristics of the glass. The lens in the optical lens provided in the present application is a plastic lens.

[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 can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all adopt an aspherical lens, which can effectively reduce aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens.

[0083] In various embodiments of the present application, when the lens adopts an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:

[0084]

[0085] wherein z is the distance from the vertex of the aspherical surface when the aspherical 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, A 2i is the aspherical surface coefficient of the 2i-th order.

[0086] The present application is further described in the following embodiments. In various embodiments, the thickness, the radius of curvature and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any change, replacement, combination or simplification made without departing from the innovative points of the present application should be regarded as equivalent replacement, and all are included in the protection scope of the present application.

[0087] Embodiment 1

[0088] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the present application. The optical lens 100 includes, in sequence along the optical axis from the object side to the imaging surface S17, a diaphragm 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 focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0090] The second lens L2 has negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0091] The third lens L3 has positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.

[0092] The fourth lens L4 has a negative focal power, the object side S7 is convex at the near optical axis, and the image side S8 is concave at the near optical axis;

[0093] The fifth lens L5 has a positive focal power, the object side S9 is concave, and the image side S10 is convex;

[0094] The sixth lens L6 has a positive focal power, the object side S11 is convex at the near optical axis, and the image side S12 is concave at the near optical axis;

[0095] The seventh lens L7 has a negative focal power, the object side S13 is convex at the near optical axis, and the image side S14 is concave at the near optical axis;

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

[0097] The imaging surface S17 is planar.

[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 stop ST is a variable aperture stop, and is arranged on the object side of the first lens L1 to control the amount of light and adjust the aperture size of the optical lens. By adjusting the distance CTst between the stop ST and the object side of the first lens on the optical axis and the aperture size of the stop ST, the stop ST has different states, so that the optical lens has different aperture values.

[0100] Specifically, in the embodiment, the adjustment range of the distance CTst between the stop and the object side of the first lens on the optical axis is -0.707-0.300mm, the EPD range is 1.646-4.419mm, and the Fno range is 1.49-4.0. 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 can be understood that the stop ST includes but is not limited to the three states.

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

[0102] Table 1-1

[0103]

[0104] The surface type parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0105] Table 1-2

[0106]

[0107]

[0108] The corresponding parameters of the optical lens 100 in embodiment 1 in 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 A field curvature curve of the optical lens 100 in the embodiment is shown, which represents the bending degree of the light rays on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.2 mm, which shows that the optical lens 100 can better correct the field curvature.

[0112] Figure 3 An F-Tan(θ) distortion curve of the optical lens 100 in the 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: °). As can be seen from the figure, the distortion value is controlled within 0-3%, which shows that the optical lens 100 can better correct the distortion.

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

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

[0115] Embodiment 2

[0116] Please refer to Figure 6Fig. 2 shows a structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present application, which mainly differs from Embodiment 1 in that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

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

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

[0119] Table 2-1

[0120]

[0121] The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0122] Table 2-2

[0123] Face number K [A4] [A6] [A8] 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 A 12 ]]> A 14 ]]> A 16 ]]> A 18 ]]> 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 Embodiment 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, the F-Tan(θ) distortion curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens 200 are shown in Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 respectively.

[0128] As can be seen from Figure 7 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.3 mm, which indicates that the optical lens 200 can better correct the field curvature.

[0129] As can be seen from Figure 8 , the distortion value is controlled within ±3%, which indicates that the optical lens 200 can better correct the distortion.

[0130] As can be seen from Figure 9It can be seen from the above table that the axial aberration offset is controlled within ±0.04 mm, which indicates that the optical lens 200 can better correct the axial aberration.

[0131] From Figure 10 It can be seen from the above table that the axial aberration offset is controlled within ±0.04 mm, which indicates that the optical lens 200 can better correct the axial aberration.

[0132] Embodiment 3

[0133] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

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

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

[0136] Table 3-1

[0137]

[0138]

[0139] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0140] Table 3-2

[0141] Face number K [A4] [A6] [A8] 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 A 12 ]]> A 14 ]]> A 16 ]]> A 18 ]]> 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 Embodiment 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, the F-Tan(θ) distortion curve, the axial aberration curve, and the axial aberration curve of the optical lens 300 are respectively as shown inFigure 12 、 Figure 13 、 Figure 14 、 Figure 15 .

[0147] From the Figure 12 , it can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, which indicates that the optical lens 300 can better correct the field curvature.

[0148] From the Figure 13 , it can be seen that the distortion value is controlled within 0-2%, which indicates that the optical lens 300 can better correct the distortion.

[0149] From the Figure 14 , it can be seen that the offset of the axial aberration is controlled within ±0.04 mm, which indicates that the optical lens 300 can better correct the axial aberration.

[0150] From the Figure 15 , it can be seen that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which indicates that the optical lens 300 can better correct the chromatic aberration.

[0151] Embodiment 4

[0152] Referring to Figure 16 , a structure schematic diagram of an optical lens 400 provided in the embodiment 4 of the present application is shown, and the main difference between the present embodiment and the embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

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

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

[0155] Table 4-1

[0156]

[0157]

[0158] The surface type parameters of the aspherical lens of the optical lens 400 in the embodiment 4 are shown in Table 4-2.

[0159] Table 4-2

[0160]

[0161]

[0162] The parameters of the optical lens 400 in Example 4 under different aperture conditions 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 transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown.

[0166] from Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens 400 can effectively correct field curvature.

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

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

[0169] from Figure 20 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 400 can correct chromatic aberration well.

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

[0171] Table 5

[0172]

[0173]

[0174] In summary, the optical lens provided by the present application adopts a variable aperture diaphragm and seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of a large aperture, an adjustable aperture, a large target surface, miniaturization, and the like.

[0175] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0176] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that, It successively 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 a positive optical power, whose object side is convex and whose image side is concave; A second lens with a negative optical power, whose object side is convex and whose image side is concave; A third lens with a positive optical power, whose object side is convex and whose image side is convex; A fourth lens with a 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 a positive optical power, whose object side is concave and whose image side is convex; A sixth lens with a 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 a 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 true image height IH corresponding to the maximum field of view of the optical lens, and the maximum aperture value Fno of the optical lens. max With the minimum aperture value Fno of the optical lens min Meets the requirement of 4.8mm <IH / (Fno max -Fno min <5mm; The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.69 < TTL / IH < 0.

72.

2. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.

9.

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