Optical lens

Abstract

The invention provides an optical lens, which sequentially comprises a first lens with positive focal power from an object side to an imaging surface along an optical axis, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from the object side to the imaging surface, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens near the optical axis is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens near the optical axis is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface near the optical axis, and the image side surface of the fifth lens is a concave surface near the optical axis; the sixth lens has positive focal power, the object side surface of the sixth lens near the optical axis is a convex surface, and the image side surface of the sixth lens is a convex surface; and the object side surface of the seventh lens is a concave surface. The optical lens provided by the invention has one or more advantages of long focus characteristic, large target surface, large aperture, high pixel and the like.

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 popularity of smart phones, the mobile phone industry is booming, and the public's various demands for mobile phones are also constantly increasing. The camera function of mobile phones has become an important factor in people's choice of mobile phones. Therefore, mobile phone manufacturers have put forward more new requirements for the lens group installed on mobile phones. At the same time, with the improvement of image sensor performance and the reduction of size, the design freedom of the corresponding lens is getting smaller and smaller, and the design difficulty is increasing day by day. Therefore, how to make the mobile phone meet the requirements of high imaging quality while ensuring that the system has high pixels, large target surface and other characteristics, and make the optical system meet the requirements of miniaturization is a problem that needs to be solved urgently. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide an optical lens having one or more advantages such as miniaturization, large target surface, large field of view, and high pixel count.

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

[0005] An optical lens, composed of seven lenses, including the following lenses in order from the object side to the imaging surface along the optical axis:

[0006] The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave;

[0007] The second lens has a negative optical power, its object side surface is convex, and its image side surface is concave;

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

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

[0010] A fifth lens having negative optical power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis;

[0011] a sixth lens having positive refractive power, whose object side surface is convex at the near optical axis and whose image side surface is convex;

[0012] A seventh lens element having negative optical power, whose object side surface is concave;

[0013] Among them, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.2; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9.

[0014] Further preferably, 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: 32 < f×(43.27 / IH) < 35.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.7 < f1 / f < 1; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.1 < R1 / R2 < 0.3.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 < R3 / R4 < 3.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.5 < f3 / f < 2.5; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.35 < R5 / R6 < 0.65.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: |f4 / f| > 20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4| < 0.1.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8 < f5 / f < -2.5; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 1 < R9 / R10 < 1.6.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.5; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -5 < R11 / R12 < -1.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.5; the effective focal length f of the optical lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: -0.5 < R13 / f < -0.1.

[0022] Further preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1 < f1 / f2 < -0.2.

[0023] Further preferably, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 4.5 < CT1 / CT2 < 7.

[0024] Further preferably, the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; the distance CT67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4.

[0025] Compared with the prior art, the optical lens provided by the present invention has a small volume through specific surface shape settings and reasonable optical power distribution; it can also achieve the characteristics of a large field of view angle and a large image plane of the lens, and can be paired with a 1-inch super-large bottom COMS chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image. In addition, the optical lens of the present invention has a long focal length characteristic, can better present larger local details, make the picture more concentrated and compact, so as to meet the local shooting requirements; at the same time, it can also reasonably correct the overall aberration of the optical lens, make the optical lens have high pixels, and improve the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 2 It is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 3 It is an F-Tanθ distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 4 It is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 5Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0033] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 8 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 2 of the present invention.

[0035] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0036] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0037] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0038] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0039] Fig.13 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 3 of the present invention.

[0040] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0041] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0042] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0043] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0044] Fig.18 4 is a F-Tanθ distortion curve of the optical lens in Example 4 of the present invention.

[0045] Fig.19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0046] Fig. 20 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0047] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The optical lens provided by the embodiment of the present invention is composed of seven lenses, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the imaging surface along the optical axis.

[0056] In some embodiments, the first lens may have positive optical power, its object side surface is convex, and its image side surface is concave. The second lens may have negative optical power, its object side surface is convex, and its image side surface is concave. The third lens may have positive optical power, its object side surface is convex, and its image side surface is concave at the near optical axis. The fourth lens may have positive optical power or negative optical power, its object side surface is concave, and its image side surface is convex at the near optical axis. The fifth lens may have negative optical power, its object side surface is convex at the near optical axis, and its image side surface is concave at the near optical axis. The sixth lens may have positive optical power, its object side surface is convex at the near optical axis, and its image side surface is convex. The seventh lens may have negative optical power, its object side surface is concave, and its image side surface may be concave or convex.

[0057] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the object side and the first lens. It is understood that the aperture is used to limit the amount of incoming light to change the brightness of the image.

[0058] 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 interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] 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 < 1.2. Meeting the above conditions can effectively limit the length of the lens and achieve miniaturization of the optical lens. The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9. Meeting the above conditions ensures that, with the same total length of the lens, it has a larger image plane, can match a larger-sized imaging chip to achieve high-definition imaging, and better realizes the balance between a small total length and a large image plane of the lens.

[0060] 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: 32 < f×(43.27 / IH) < 35. Meeting the above conditions can make the equivalent focal length of the lens have an imaging focal length of nearly 35mm for the humanities focal length, and the imaging perspective is close to the human eye perspective, which 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.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.7 < f1 / f < 1; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.1 < R1 / R2 < 0.3. Meeting 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 conducive to increasing 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 darker environment.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 < R3 / R4 < 3. Meeting the above conditions, by reasonably setting the focal length and surface shape of the second lens, the positive optical power at the front end of the optical lens can be shared, which is conducive to avoiding excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of correcting aberration.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.5 < f3 / f < 2.5; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.35 < R5 / R6 < 0.65. Meeting the above conditions, by reasonably setting the focal length and surface shape of the third lens, the light can be effectively converged, the difficulty of correcting the distortion of the edge field of view can be reduced, ensuring that the lens has a small distortion while achieving a large field of view angle, and improving the overall imaging quality.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: |f4 / f| > 20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4| < 0.1. Meeting the above conditions, by reasonably setting the refractive powers of the third lens and the fourth lens, it is beneficial for the smooth transition of light rays, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8 < f5 / f < -2.5; the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the image side of the fifth lens satisfy: 1 < R9 / R10 < 1.6. Meeting the above conditions is beneficial for reducing the deflection degree of the incident light rays, avoiding excessive aberration caused by too strong refractive changes, and at the same time is beneficial for balancing various aberrations generated by the front lens group, improving the overall imaging quality.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.5; the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: -5 < R11 / R12 < -1. Meeting the above conditions, by setting the sixth lens to have a large positive refractive power, the aberrations of the edge field of view can be effectively improved, and the overall imaging quality of the optical lens can be improved.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.5; the effective focal length f of the optical lens and the radius of curvature R13 of the object side of the seventh lens satisfy: -0.5 < R13 / f < -0.1. Meeting the above conditions, the seventh lens can provide a large negative refractive power, which is beneficial for increasing the incident angle of light rays into the image plane, further increasing the imaging area of the lens, and realizing large target surface imaging of the lens.

[0068] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1 < f1 / f2 < -0.2. Meeting the above conditions, by reasonably setting the focal length relationship of the first two lenses, it helps more light rays enter the rear optical system, increasing the field of view angle of the lens and improving the overall imaging quality at the same time.

[0069] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 4.5 < CT1 / CT2 < 7. Meeting the above conditions, by reasonably controlling the relationship between the central thicknesses of the first and second lenses, the field curvature and distortion of the off-axis field of view can be effectively improved, the resolution can be improved, and at the same time the lens forming difficulty can be reduced.

[0070] In some embodiments, the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; the distance CT67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4. Meeting the above conditions can reduce the assembly deformation and assembly difficulty of the lens while meeting the requirements of assembly stability. At the same time, by reasonably setting the central thickness and air gap of the sixth and seventh lenses, the rear-end size of the lens can be effectively controlled, realizing the miniaturization of the lens.

[0071] In some embodiments, the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 0.8 < R7 / R8 < 1.3. Meeting the above conditions can control the spherical aberration contribution of the fourth lens within a reasonable range by reasonably controlling the surface shape of the fourth lens, enabling the lens to have a high axial imaging resolution and facilitating the realization of high-definition imaging of the lens.

[0072] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -7 < f5 / f6 < -2. Meeting the above conditions is beneficial to the smooth transition of light rays and the correction of various aberrations of the optical lens by reasonably setting the ratio of the focal lengths of the fifth and sixth lenses in the lens, thereby improving the imaging quality of the optical lens.

[0073] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.5 < f1 / f7 < -1. Meeting the above conditions can increase the area of light entering the imaging surface while ensuring that as much light as possible enters the system by reasonably setting the focal length relationship between the first and last lenses in the lens, which is beneficial to realizing large-image-plane imaging of the lens and increasing the light input at the same time, achieving the large-aperture performance of the lens.

[0074] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35 < IH / EPD < 2.5. Meeting the above conditions can enable the lens to have a large entrance pupil diameter and a large imaging surface, increase the width of the incident light beam, improve the light flux, and better realize the large aperture and large image plane of the lens.

[0075] In some embodiments, the optical lens satisfies the conditional formula: 12mm < TTL < 13mm, 10mm < f < 12mm, 13.5mm < IH < 15.5mm, Fno < 1.9, 60° < FOV < 70°; where TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, Fno represents the aperture value of the optical lens, and FOV represents the maximum field of view angle 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 large image height, long focal length, large aperture, and miniaturization.

[0076] 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. Additionally, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance between the miniaturization of the lens and high image quality.

[0077] 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 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 achieving 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 adopt 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 achieving the miniaturization of the lens.

[0078] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0079]

[0080] 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.

[0081] 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.

[0082] Example 1

[0083] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: 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.

[0084] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0085] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0086] The third lens L3 has positive refractive power, its object side surface S5 is convex, and its image side surface S6 is concave near the optical axis;

[0087] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0088] The fifth lens L5 has negative refractive power, an object-side surface S9 thereof is convex at the near optical axis, and an image-side surface S10 thereof is concave at the near optical axis;

[0089] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex at the near optical axis, and its image-side surface S12 is convex;

[0090] 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;

[0091] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0092] The imaging surface S17 is a plane.

[0093] 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 are all plastic aspherical lenses.

[0094] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0098] Table 1-2

[0099]

[0100]

[0101] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which indicates the degree of curvature of light in the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens 100 can correct the field curvature well.

[0102] Figure 3 The F-Tanθ distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the distortion value is controlled within ±2.5%, indicating that the optical lens 100 can correct the distortion well.

[0103] Figure 4 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -0.04mm to 0.02mm, indicating that the optical lens 100 can correct the axial aberration well.

[0104] Figure 5 The vertical axis chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0105] Example 2

[0106] See also Figure 6 , which 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 between this embodiment and Example 1 are: the image side surface S14 of the seventh lens L7 is a convex 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]

[0114] In this embodiment, the field curvature curve, F-Tanθ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0115] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens 200 can correct the field curvature well.

[0116] from Figure 8 It can be seen that the distortion value is controlled within ±2.5%, indicating that the optical lens 200 can correct the distortion well.

[0117] from Fig. 9 It can be seen from the figure that the offset of the axial aberration is controlled within the range of -0.04 mm to 0.03 mm, which indicates that the optical lens 200 can correct the axial aberration well.

[0118] from Fig.10 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0119] Example 3

[0120] See also Fig.11, which is a schematic diagram of the structure of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment mainly differs in that: 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.

[0121] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0122] Table 3-1

[0123]

[0124] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0125] Table 3-2

[0126]

[0127]

[0128] In this embodiment, the field curvature curve, F-Tanθ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0129] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the field curvature well.

[0130] from Fig.13 It can be seen that the distortion value is controlled within ±2%, indicating that the optical lens 300 can correct the distortion well.

[0131] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0132] from Fig.15 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0133] Example 4

[0134] See also Fig.16, which is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the fourth lens L4 has negative optical power; 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.

[0135] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0136] Table 4-1

[0137]

[0138]

[0139] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0140] Table 4-2

[0141]

[0142]

[0143] In this embodiment, the field curvature curve, F-Tanθ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 , Fig. 20 shown.

[0144] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.15mm, indicating that the optical lens 400 can correct the field curvature well.

[0145] from Fig.18 It can be seen that the distortion value is controlled within ±2%, indicating that the optical lens 400 can correct the distortion well.

[0146] from Fig.19 It can be seen that the offset of the axial aberration is controlled within -0.04 mm to 0.03 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0147] from Fig. 20 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0148] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0149] Table 5

[0150]

[0151]

[0152] In summary, the optical lens provided by the present invention has at least the following advantages:

[0153] (1) Through specific surface shape settings and reasonable optical focal length distribution, it is possible to achieve an imaging effect close to the 35mm human focal length. The imaging perspective is close to the perspective of the human eye, which can capture a wide scene while retaining sufficient details and depth. When taking photos, it can better highlight the subject, which is conducive to enhancing the natural realism of the imaging picture and bringing a better imaging experience to users.

[0154] (2) The lens can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens; it can also realize the large field of view and large image surface characteristics of the lens, and can be matched with a 1-inch ultra-large bottom COMS chip, which is conducive to improving the lens resolution and image detail restoration.

[0155] (3) The lens has a telephoto characteristic, which can better present larger local details, making the picture more focused and compact, thus meeting the needs of local shooting; at the same time, it can also reasonably correct the overall aberration of the optical lens, making the optical lens have high pixels and improving the imaging quality of the optical lens.

[0156] 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.

[0157] 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, which is composed of seven lenses, characterized in that along the optical axis from the object side to the imaging surface, it successively includes: a first lens with positive optical power, its object side surface is convex, and its image side surface is concave; a second lens with negative optical power, its object side surface is convex, and its image side surface is concave; a third lens with positive optical power, its object side surface is convex, and its image side surface is concave near the optical axis; a fourth lens with optical power, its object side surface is concave, and its image side surface is convex near the optical axis; a fifth lens with negative optical power, its object side surface is convex near the optical axis, and its image side surface is concave near the optical axis; a sixth lens with positive optical power, its object side surface is convex near the optical axis, and its image side surface is convex; a seventh lens with negative optical power, its object side surface is concave; wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.2; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.8 < TTL / IH < 0.

9.

2. The optical lens according to claim 1, characterized in that 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: 32 < f×(43.27 / IH) < 35.

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: 0.7 < f1 / f < 1; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.1 < R1 / R2 < 0.

3.

4. 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: -2 < f2 / f < -1; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 < R3 / R4 < 3.

5. 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: 1.5 < f3 / f < 2.5; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.35 < R5 / R6 < 0.

65.

6. 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: |f4 / f| > 20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4| < 0.

1.

7. 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: -8 < f5 / f < -2.5; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 1 < R9 / R10 < 1.

6.

8. 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: 1 < f6 / f < 1.5; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -5 < R11 / R12 < -1.

9. 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: -0.8 < f7 / f < -0.5; the effective focal length f of the optical lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: -0.5 < R13 / f < -0.

1.

10. The optical lens according to claim 1, characterized in that the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 4.5 < CT1 / CT2 < 7.

11. The optical lens according to claim 1, characterized in that the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; the distance CT67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4.

Images