Optical lens

Abstract

The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with a positive focal power, the object side surface of which is convex; a second lens with a positive focal power, the object side surface of which is convex and the image side surface of which is concave; a third lens with a positive focal power, the object side surface of which is convex and the image side surface of which is concave; a fourth lens with a negative focal power, the object side surface of which is concave and the image side surface of which is convex; a fifth lens with a negative focal power; a sixth lens with a negative focal power; a seventh lens with a focal power; wherein, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.95 < IH / f < 1.1. The optical lens provided by the present invention can improve the imaging quality of the optical lens and reduce aberration through specific surface shape settings and reasonable focal power distribution, and has the advantage of excellent imaging quality.

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] With the rapid growth of the consumer electronics market and the popularity of social, video, and live broadcasting software, people have higher and higher requirements for the imaging quality of camera lenses. Camera lenses have even become the primary consideration for consumers when purchasing electronic devices. In particular, as people become more and more active on online social platforms, higher requirements are placed on the optical performance of electronic shooting equipment. Not only are imaging lenses required to be able to shoot clearly in darker environments, but they are also required to have the characteristics of long focal length and small depth of field to better achieve the function of blurring the background and highlighting the subject, so as to capture a more textured picture. At present, many imaging lenses have blurred image quality when shooting night scenes or indoors in poor lighting conditions. Moreover, most lenses can well image the subject when shooting close-ups, but have poor imaging for distant targets, and cannot take into account high-pixel long-distance imaging. When shooting distant objects, the subject cannot be highlighted. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0004] The technical solution adopted by the present invention is:

[0005] An optical lens, comprising seven lenses, which include:

[0006] A first lens having positive optical power, whose object side surface is convex;

[0007] The second lens has positive refractive power, its object side surface is convex, and its image side surface is concave;

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

[0009] a fourth lens having negative optical power, whose object side surface is concave and whose image side surface is convex;

[0010] a fifth lens having negative optical power;

[0011] a sixth lens having negative optical power;

[0012] a seventh lens having optical power;

[0013] The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 0.95 <IH / f<1.1。

[0014] More preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5 < f1 / f < 1.

[0015] More preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 5 < f2 / f < 25.

[0016] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3 < f3 / f < 25.

[0017] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8 < f4 / f < -1.

[0018] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -35 < f5 / f < -1.

[0019] More preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -50 < f6 / f < -0.5.

[0020] More preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.02 < f1 / f2 < 0.2; the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.5 < CT1 / CT2 < 5.

[0021] More preferably, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.15; 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: 1 < TTL / IH < 1.1.

[0022] More preferably, the true image height IH corresponding to the maximum field of view angle of the optical lens and the radian θ of the maximum half field of view angle of the optical lens satisfy: 16 mm / rad < IH / θ < 20 mm / rad.

[0023] Compared with the prior art, the optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens by setting a specific surface shape and reasonably distributing the optical power, so that the lens has one or more advantages such as long focal length, large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0025] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0026] Figure 2 Graph showing the astigmatism of the optical lens in Example 1 of the present invention.

[0027] Figure 3 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 5 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 6 Graph showing the astigmatism of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 7 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 8 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0033] Fig. 9 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0034] Fig.10 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0035] Fig.11 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0036] Fig.12 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0037] Fig.13 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0038] Fig.14 4 is an astigmatism curve diagram of the optical lens in Example 4 of the present invention.

[0039] Fig.15 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0040] Fig.16 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0041] Fig.17 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0042] Fig.18 4 is an astigmatism curve diagram of the optical lens in Example 5 of the present invention.

[0043] Fig.19 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention.

[0044] Fig. 20 Graph showing the vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0045] Fig.21 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0046] Fig. 22 4 is an astigmatism curve diagram of the optical lens in Example 6 of the present invention.

[0047] Fig.23 Graph showing the axial aberration of the optical lens in Embodiment 6 of the present invention.

[0048] Fig.24 Graph showing the vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0049] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The optical lens provided by the embodiment of the present invention comprises seven lenses in total, which include, in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

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

[0059] In some embodiments, the optical lens may further include a diaphragm, which may be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the imaging.

[0060] In some embodiments, the optical lens may further include a filter, which may be disposed 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.

[0061] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.95 < IH / f < 1.1. By satisfying the above conditions, the lens can be controlled to have a longer focal length, ensuring that the subject can be well highlighted during shooting, the background can be blurred, and better portrait shooting can be achieved.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5 < f1 / f < 1. By satisfying the above conditions, by setting the first lens to have a large positive refractive power, the incident light can be converged to a large extent, and more light can enter the system, which is beneficial to improving the light input of the lens, realizing the large aperture performance of the lens, and enabling the lens to achieve high-definition imaging even in a relatively dark environment.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 5 < f2 / f < 25; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.5 < R3 / R4 < 1. By satisfying the above conditions, by reasonably setting the focal power and surface shape of the second lens, the degree of deflection of the light entering the second lens can be effectively reduced, which is beneficial to maintaining the miniaturization of the lens head, and at the same time enables the lens to have a large aperture and increase the light flux entering the lens.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3 < f3 / f < 25; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.1 < R5 / R6 < 1. Meeting the above conditions is conducive to further convergence of light, enabling the converged light to smoothly enter the subsequent optical system and better achieving high-quality imaging of the lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8 < f4 / f < -1; 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: 0.3 < R7 / R8 < 0.8. Meeting the above conditions can balance the positive spherical aberration generated by the fourth negative lens and the negative spherical aberration generated by the previous positive lens, improve the overall imaging quality, and at the same time can reasonably control the trend of light, avoiding the problem of excessive lens sensitivity caused by excessive light deflection.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -35 < f5 / f < -1. Meeting the above conditions can control the contribution of spherical aberration of the fifth lens within a reasonable range, enabling the lens to have a high axial imaging resolution ability and facilitating high-definition imaging of the lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -50 < f6 / f < -0.5. Meeting the above conditions is conducive to increasing the divergence degree of light, increasing the area of light entering the imaging surface, achieving large target surface imaging of the lens, and improving the imaging quality of the optical lens.

[0068] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.02 < f1 / f2 < 0.2. Meeting the above conditions, by reasonably setting the ratio of the focal lengths of the first and second lenses in the lens, it is conducive to the smooth transition of light, while correcting various aberrations of the optical lens, improving the imaging quality of the optical lens, ensuring that as much light as possible enters the system, increasing the light input, and achieving large aperture imaging of the lens.

[0069] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.5 < CT1 / CT2 < 5. Meeting the above conditions can reduce the assembly deformation and assembly difficulty of the lens while meeting the requirements of assembly stability, and at the same time make the structure of the lens more compact, facilitating the miniaturization of the lens.

[0070] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.15. Meeting the above conditions can effectively limit the length of the lens and is conducive to realizing the miniaturization of the optical lens.

[0071] 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: 1 < TTL / IH < 1.1. Meeting the above conditions ensures that the lens has a larger image plane under the same total length of the lens, can match a larger-sized imaging chip to achieve high-definition imaging, and can better achieve the balance between the small total length and the large image plane of the lens.

[0072] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the radian θ of the maximum half field of view angle of the optical lens satisfy: 16 mm / rad < IH / θ < 20 mm / rad. Meeting the above conditions can make the lens have a larger imaging surface and a smaller field of view angle, and can effectively blur the background and highlight the focused subject during shooting.

[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 < 0.14; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.11 < BFL / f < 0.15. Meeting the above conditions can make the lens have an appropriate back focus, ensure the compatibility between the lens and the fuselage, and make the structure of the lens more compact.

[0074] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens, the maximum field of view angle FOV of the optical lens, and the effective focal length f of the optical lens satisfy: 50° < (f × FOV) / IH < 55°. Meeting the above conditions can better achieve the balance of the long focal length, small field of view, and large image plane of the lens.

[0075] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 40 < f × (43.27 / IH) < 45. Meeting the above conditions can make the imaging angle of view of the lens close to the human eye view angle, can better highlight the shooting theme, is conducive to enhancing the natural realism of the imaging picture, and brings a better imaging experience to users.

[0076] In some embodiments, the optical lens satisfies the conditional formula: 8mm < f < 9mm, 50° < FOV < 55°, 8mm < TTL < 9mm, 8mm < IH < 9mm, Fno < 2.1, where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, TTL represents the overall optical length of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, and Fno represents the aperture value of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of a smaller overall optical length, long focal length performance, a larger image plane, and large aperture performance, etc.

[0077] 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. On the other hand, 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. The first lens in the optical lens provided by the present invention uses a glass lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens all use plastic lenses. Adopting a glass-plastic hybrid structure can improve the thermal stability performance.

[0078] 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 use spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the 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 of the present invention can all use aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0079] In each embodiment of the present invention, when the lens uses an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0080] ;

[0081] where z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H, I, J are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order, eighteenth order, and twentieth order respectively.

[0082] 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.

[0083] Example 1

[0084] 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.

[0085] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0086] The second lens L2 has positive refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0087] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0088] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0089] The fifth lens L5 has negative refractive power, its object side surface S9 is concave, and its image side surface S10 is concave at the near optical axis;

[0090] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is convex near the optical axis;

[0091] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is concave at the near optical axis;

[0092] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0093] The imaging surface S17 is a plane.

[0094] The first lens L1 is a glass aspherical lens, and 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.

[0095] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0096] Table 1-1

[0097]

[0098] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0099] Table 1-2

[0100]

[0101] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 shown.

[0102] Figure 2 The astigmatism curve of Example 1 is shown, which represents the astigmatism of light of different wavelengths on the meridional image plane and the sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can correct the astigmatism well.

[0103] Figure 3 The axial aberration curve of Example 1 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 ±0.04mm, indicating that the optical lens 100 can better correct the axial aberration.

[0104] Figure 4 The vertical chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical 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 chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 100 can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0105] Example 2

[0106] See also Figure 5, 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 differences of this embodiment are: the object-side surface S9 of the fifth lens L5 is a convex surface at the near optical axis; the object-side surface S11 of the sixth lens L6 is a convex surface at the near optical axis; the image-side surface S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0107] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0111] Table 2-2

[0112]

[0113] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical axis chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 shown.

[0114] from Figure 6 It can be seen that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens can correct the astigmatism well.

[0115] from Figure 7 It can be seen that the offset of axial aberration is controlled within ±0.04mm, which means that the optical lens can correct axial aberration well.

[0116] from Figure 8 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0117] Example 3

[0118] See also Fig. 9 , 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 differences of this embodiment are: the object side surface S9 of the fifth lens L5 is convex at the near optical axis; the image side surface S12 of the sixth lens L6 is concave at the near optical axis; the image side surface S14 of the seventh lens L7 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0119] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0120] Table 3-1

[0121]

[0122] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0123] Table 3-2

[0124]

[0125] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical axis chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.10 , Fig.11 , Fig.12 shown.

[0126] from Fig.10 It can be seen that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens can correct the astigmatism well.

[0127] from Fig.11 It can be seen that the offset of axial aberration is controlled within ±0.04mm, which means that the optical lens can correct axial aberration well.

[0128] from Fig.12 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0129] Example 4

[0130] See also Fig.13 , 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 differences of this embodiment are: the image side surface S2 of the first lens L1 is a convex surface; the image side surface S10 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0131] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0132] Table 4-1

[0133]

[0134] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0135] Table 4-2

[0136]

[0137] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 400 are respectively as follows: Fig.14 , Fig.15 , Fig.16 shown.

[0138] from Fig.14 It can be seen that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens can correct the astigmatism well.

[0139] from Fig.15 It can be seen that the offset of axial aberration is controlled within ±0.04mm, which means that the optical lens can correct axial aberration well.

[0140] from Fig.16 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0141] Example 5

[0142] See also Fig.17 , shown is a schematic diagram of the structure of the optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, the main differences of this embodiment are: the seventh lens L7 has positive focal power; the object side surface S9 of the fifth lens L5 is convex at the near optical axis; the image side surface S12 of the sixth lens L6 is concave at the near optical axis; the image side surface S14 of the seventh lens L7 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0143] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0144] Table 5-1

[0145]

[0146] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0147] Table 5-2

[0148]

[0149] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 500 are respectively as follows: Fig.18 , Fig.19 , Fig. 20 shown.

[0150] from Fig.18 It can be seen that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens can correct the astigmatism well.

[0151] from Fig.19 It can be seen that the offset of axial aberration is controlled within ±0.04mm, which means that the optical lens can correct axial aberration well.

[0152] from Fig. 20 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0153] Example 6

[0154] See also Fig.21 , shown is a schematic diagram of the structure of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, this embodiment has the following main differences: the seventh lens L7 has positive focal power; the image side surface S12 of the sixth lens L6 is a concave surface at the near optical axis; the object side surface S13 of the seventh lens L7 is a convex surface at the near optical axis; the image side surface S14 of the seventh lens L7 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0155] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0156] Table 6-1

[0157]

[0158] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0159] Table 6-2

[0160]

[0161] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 600 are respectively as follows: Fig. 22 , Fig.23 , Fig.24 shown.

[0162] from Fig. 22 It can be seen that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens can correct the astigmatism well.

[0163] from Fig.23It can be seen that the offset of axial aberration is controlled within ±0.03mm, which means that the optical lens can correct axial aberration well.

[0164] from Fig.24 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0165] Please refer to Table 7, 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.

[0166] Table 7

[0167]

[0168] In summary of the above embodiments, the optical lens provided by the present invention has a relatively compact structure through a specific surface shape setting and a reasonable distribution of optical focal length, which effectively shortens the overall length of the optical lens, has a telephoto performance, and can achieve a shooting experience of bringing distant scenes closer, which is conducive to better achieving a shooting effect with a small depth of field, blurring the background, and highlighting the subject. At the same time, it has a larger image surface, which allows the lens to be matched with an imaging chip with an ultra-large target surface to achieve high-definition imaging, which is conducive to improving the lens resolution and image detail restoration. The present invention also has a large aperture performance, which can achieve high-definition imaging even in a dim environment, and can also reasonably correct the overall aberration of the optical lens to improve the imaging quality of the optical lens.

[0169] 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.

[0170] 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, comprising seven lenses, characterized in that: It sequentially includes from the object side to the imaging plane along the optical axis: A first lens with positive optical power, whose object side is convex; A second lens with positive 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 concave; A fourth lens with negative optical power, whose object side is concave and whose image side is convex; A fifth lens with negative optical power; A sixth lens with negative optical power; A seventh lens with optical power; Wherein, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.95 < IH / f < 1.1; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3 < f3 / f < 25.

2. 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: 0.5 < f1 / f < 1.

3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 5 < f2 / f < 25.

4. 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: -8 < f4 / f < -1.

5. 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: -35 < f5 / f < -1.

6. 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: -50 < f6 / f < -0.

5.

7. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.02 < f1 / f2 < 0.2; the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.5 < CT1 / CT2 < 5.

8. The optical lens according to claim 1, characterized in that: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.15; 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: 1 < TTL / IH < 1.

1.

9. The optical lens according to claim 1, characterized in that: The true image height IH corresponding to the maximum field of view angle of the optical lens and the radian θ of the maximum half field of view angle of the optical lens satisfy: 16 mm / rad < IH / θ < 20 mm / rad.

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