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 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 negative optical power; 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 image side is convex; a sixth lens with a negative optical power; a seventh lens with a negative optical power, whose image side is concave near the optical axis; the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.3 < IH / f < 1.6. The optical lens provided by the present invention can improve the imaging quality of the optical lens through specific surface shape matching and reasonable optical power distribution, and has the advantages 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 prevalence of remote work and online education, video conferencing has become an indispensable part of people's daily lives and work. The quality of video conferencing depends largely on the optical lens used, which places higher demands on video conferencing lenses. For example, to provide clear video quality, video conferencing lenses generally need to provide high resolution, such as 1080p or 4K. For another example, to effectively capture participants in a conference room, video conferencing lenses are often required to better blur the background and highlight the main subject. To provide good video quality even in low-light environments, video conferencing lenses are generally required to have a large aperture. Traditional video conferencing lenses have more or less certain limitations, such as low resolution and poor imaging in low-light or dim environments. Therefore, there is an urgent need to provide an optical lens that can meet the needs of video conferencing. 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 present invention provides an optical lens, comprising seven lenses, which include the following lenses in order from the object side to the imaging surface along the optical axis:

[0005] The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave;

[0006] a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave;

[0007] a third lens having negative optical power;

[0008] a fourth lens element having negative optical power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis;

[0009] a fifth lens element having positive refractive power and a convex image-side surface;

[0010] a sixth lens having negative optical power;

[0011] The seventh lens element has a negative optical power and its image-side surface is concave near the optical axis.

[0012] The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy the following conditions: 1.3 <IH / f<1.6。

[0013] Further preferably, 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: 0.8 < TTL / IH < 0.92.

[0014] Further preferably, the combined focal length f14 of the first lens, the second lens, the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f14 / f < 1.6.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.85 < f1 / f < 1.05; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.5 < f2 / f < -2.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -25 < f3 / f < -5.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -28 < f4 / f < -2; the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 1 < R7 / R8 < 1.7.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 0.85.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -10 < f6 / f < -1.8.

[0020] 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.

[0021] Further preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 6mm < IH / Fno < 6.7mm.

[0022] Further preferably, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.8 < f1 / f7 < -1; the object-side clear aperture DM11 of the first lens and the image-side clear aperture DM72 of the seventh lens satisfy: 0.37 < DM11 / DM72 < 0.47.

[0023] Compared with the existing technology, the optical lens provided by the present invention uses seven lenses with specific optical focal lengths. Through the combination of specific surface shapes and reasonable optical focal length distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as long focus, large aperture, large image height, high pixels, 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 readily understood from the description of the embodiments with reference to the following drawings, in which:

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

[0026] Figure 2 4 is an astigmatism curve diagram of the optical lens in Example 1 of the present invention.

[0027] Figure 3 2 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 1 of the present invention.

[0028] Figure 4 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0029] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0030] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0031] Figure 7 Graph showing the astigmatism of the optical lens in Example 2 of the present invention.

[0032] Figure 8 2 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 2 of the present invention.

[0033] Figure 9 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 10 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0035] Figure 11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0036] Figure 12 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0037] Figure 132 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 3 of the present invention.

[0038] Figure 14 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0039] Figure 15 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0040] Figure 16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0041] Figure 17 4 is an astigmatism curve diagram of the optical lens in Example 4 of the present invention.

[0042] Figure 18 4 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 4 of the present invention.

[0043] Figure 19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0044] Figure 20 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0045] Figure 21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0046] Figure 22 4 is an astigmatism curve diagram of the optical lens in Example 5 of the present invention.

[0047] Figure 23 4 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 5 of the present invention.

[0048] Figure 24 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0049] Figure 25 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0050] Figure 26 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0051] Figure 27 4 is an astigmatism curve diagram of the optical lens in Example 6 of the present invention.

[0052] Figure 28 4 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 6 of the present invention.

[0053] Figure 294 is an axial aberration curve diagram of the optical lens in Example 6 of the present invention.

[0054] Figure 30 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0055] Figure 31 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0056] Figure 32 4 is an astigmatism curve diagram of the optical lens in Example 7 of the present invention.

[0057] Figure 33 2 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 7 of the present invention.

[0058] Figure 34 Graph showing the axial aberration of the optical lens in Example 7 of the present invention.

[0059] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0060] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0061] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of 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.

[0062] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0063] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0064] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0065] 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 preclude 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 list of 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.

[0066] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0067] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0068] The optical lens provided in an embodiment of the present invention comprises seven lenses in total. The optical lens comprises, 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.

[0069] In some embodiments, the first lens may have a positive focal power, with its object side being convex and its image side being concave. The second lens may have a negative focal power, with its object side being convex and its image side being concave. The third lens may have a negative focal power, and its object side may be concave or convex, and its image side may be concave or convex. The fourth lens may have a negative focal power, with its object side being convex near the optical axis and its image side being concave near the optical axis. The fifth lens may have a positive focal power, and its object side may be concave or convex, and its image side is convex. The sixth lens may have a negative focal power, and its object side may be concave or convex, and its image side may be concave or convex. The seventh lens may have a negative focal power, and its object side may be concave or convex, and its image side is concave near the optical axis.

[0070] 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 can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image formation.

[0071] In some embodiments, the optical lens may further include a filter, and the filter is 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.

[0072] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.3 < IH / f < 1.6. Meeting the above conditions can enable the lens to have a large image surface and long focal length performance, and be able to match a larger-sized chip to achieve high-definition imaging.

[0073] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8 < TTL / IH < 0.92. Meeting the above conditions can better achieve the miniaturization of the lens, and at the same time ensure that the lens has a large image surface under the condition of the same overall length, and be able to match a larger-sized imaging chip to achieve high-definition imaging.

[0074] In some embodiments, the combined focal length f14 of the first lens, the second lens, the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f14 / f < 1.6. Meeting the above conditions is beneficial to the convergence of light, enabling the light entering the system from the front end to smoothly enter the rear optical system, making the overall optical path more gentle, optimizing aberrations, and improving imaging resolution.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.85 < f1 / f < 1.05; the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.08 < R1 / R2 < 0.28. Meeting the above conditions can endow the first lens with a large positive refractive power, while improving the light collection ability of the peripheral field of view, reducing the working aperture of the first lens, which is beneficial to achieving the balance of a large aperture and a small aperture.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.5 < f2 / f < -2; the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 1.2 < R3 / R4 < 1.7. Meeting the above conditions, by reasonably setting the focal length and surface shape of the second lens, the incident light can be effectively diverged, avoiding excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -25 < f3 / f < -5. Meeting the above conditions, by reasonably setting the focal length of the third lens, it is beneficial for the light to transition smoothly, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -28 < f4 / f < -2; 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 < R7 / R8 < 1.7. Meeting the above conditions, by reasonably setting the focal length and surface shape of the fourth lens, the incident light can be further diverged, the light in the central field of view can be diverged, and at the same time, combined with the bending of the edge region of the fifth lens, the exit angle of the light in the peripheral field of view can be reduced, improving the relative illumination of the peripheral field of view.

[0079] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 0.85. Meeting the above conditions, by setting the fifth lens to have a large positive optical power, the incident light at the front end can be effectively converged, which is beneficial for correcting the aberration and distortion of the peripheral field of view brought by the front lens group, enabling the lens to have a small distortion and providing a high-definition imaging effect.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -10 < f6 / f < -1.8. Meeting the above conditions, by reasonably setting the focal length of the sixth lens, the light in the peripheral field of view can be effectively diverged, and at the same time, combined with the bending of the edge region of the seventh lens, the exit angle of the light in the peripheral field of view can be reduced, improving the relative illumination of the peripheral field of view.

[0081] 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. By satisfying the above conditions, by setting the seventh lens to have a large negative optical power, the incident light can be diverged to a large extent, causing the peripheral light and the central light to turn upwards and reach a higher imaging position, better achieving large target surface imaging of the lens and improving the imaging quality.

[0082] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the F-number Fno of the optical lens satisfy: 6mm < IH / Fno < 6.7mm. By satisfying the above conditions, the lens can better achieve the balance of large target surface imaging and large aperture performance, the pixel distribution can be sparser (i.e., the pixel size is larger), noise can be reduced in a darker environment, the dynamic range will be wider, and more details can be retained in the dark part, thereby improving the picture quality.

[0083] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.8 < f1 / f7 < -1; the clear aperture DM11 of the object side of the first lens and the clear aperture DM72 of the image side of the seventh lens satisfy: 0.37 < DM11 / DM72 < 0.47. By satisfying the above conditions, by reasonably setting the ratio of the focal lengths and apertures of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0084] In some embodiments, the overall length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.3. By satisfying the above conditions, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0085] In some embodiments, the radius of curvature R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy: -1 < R10 / f < -0.2. By satisfying the above conditions, it is beneficial to better achieve the convergence of light, shorten the distance for light to reach the next lens, and is beneficial to reducing the overall length of the optical lens.

[0086] In some embodiments, the radius of curvature R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.2 < R14 / f < 3.2. By satisfying the above conditions, the angle of incidence of the peripheral field on the imaging surface can be appropriately suppressed, and more light beams can be effectively transmitted to the imaging surface, improving the relative illumination of the optical lens.

[0087] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.4 < f1 / f2 < -0.2. Meeting the above conditions, by reasonably allocating the focal lengths of the first and second lenses, it is beneficial to achieve the balance of the long focal length and high pixel of the optical lens, and at the same time, it is beneficial to shorten the total length of the optical lens.

[0088] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.3 < f5 / f6 < -0.05. Meeting the above conditions is beneficial to the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0089] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.55 < ∑CT / TTL < 0.7. Meeting the above conditions can effectively compress the total length of the optical lens, and at the same time is beneficial to the structural design and production process of the optical lens.

[0090] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.4 < IH / EPD < 2.85. Meeting the above conditions can increase the width of the light beam entering the optical lens, improving the brightness at the image plane of the optical lens and avoiding the generation of vignetting.

[0091] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.96 < (2 × f × tan(FOV / 2)) / IH < 1.02. Meeting the above conditions can make the lens have a small distortion value (such as a distortion value < 1%), reducing the degree of image deformation in the edge field of view, and capable of providing a high-definition imaging effect.

[0092] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the combined focal length f14 of the first lens, the second lens, the third lens, and the fourth lens satisfy: 0.75 < f13 / f14 < 1.1. Meeting the above conditions, by reasonably balancing the proportion of the focal lengths of the first three lenses, it is beneficial to balance various aberrations of the lens and improve the overall imaging quality.

[0093] In some embodiments, the optical lens satisfies the conditional formula: 7.5mm < f < 8.3mm, 9.2mm < TTL < 10.5mm, 1.7 < Fno < 1.9, 10.5mm < IH < 12mm, 68° < FOV < 76°, where f represents the effective focal length of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, and FOV represents the maximum field 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 following advantages: a relatively small total optical length; a relatively large imaging surface, which can be matched with a larger-sized chip to achieve high-definition imaging; a relatively large aperture value, enabling the lens to achieve high-definition imaging even in a relatively dark environment; and the characteristics of long focal length and short depth of field, which can better blur the background and highlight the subject when shooting distant scenes or people.

[0094] In some embodiments, all seven lenses in the optical lens can be made of plastic lenses or adopt a structure with a combination of glass and plastic materials. Preferably, the optical lens of the present invention adopts a structure of seven lenses with a combination of glass and plastic, which can enable the optical lens to better match a large target surface chip to achieve high-definition imaging, and at the same time can also achieve a reasonable balance among miniaturization, large image surface, and large wide angle of the optical lens. Specifically, the first lens can be made of a glass lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, and reduce the volume, providing an optical lens product with higher cost performance.

[0095] In some embodiment modes, 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 in the optical lens provided by the present invention can adopt aspherical lenses.

[0096] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0097] ;

[0098] where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively.

[0099] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0100] Example 1

[0101] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention. 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.

[0102] The first lens L1 has positive refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0103] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0104] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0105] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex at the near optical axis, and its image-side surface S8 is concave at the near optical axis;

[0106] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex near the optical axis, and its image-side surface S10 is convex;

[0107] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is convex;

[0108] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is concave near the optical axis.

[0109] The object-side surface S15 and the image-side surface S16 of the filter G1 are both flat surfaces;

[0110] The imaging surface S17 is a plane.

[0111] The first lens L1 is a glass aspherical lens; 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.

[0112] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0113] Table 1-1

[0114]

[0115] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0116] Table 1-2

[0117]

[0118] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0119] Figure 2 The astigmatism curve of the optical lens 100 in this embodiment is shown, which shows the astigmatism of light in the meridional image plane and the sagittal image plane. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0120] Figure 3 A distortion curve of f-tan(θ) for the optical lens 100 of this embodiment is shown, representing the distortion at different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the graph, the distortion value is controlled within ±1%, indicating that the optical lens 100 is capable of effectively correcting distortion.

[0121] Figure 4 The following is a graph showing the axial aberration of the optical lens 100 in this embodiment, which shows the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±0.02mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0122] Figure 5A graph showing the vertical chromatic aberration of the optical lens 100 in this embodiment shows the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging plane. 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 of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±1 μm, indicating that the optical lens 100 is capable of effectively correcting chromatic aberration.

[0123] Example 2

[0124] See also Figure 6 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0125] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0126] Table 2-1

[0127]

[0128] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0129] Table 2-2

[0130]

[0131] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are shown as follows: Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown. Figure 7 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct astigmatism well. Figure 8 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 200 can correct the distortion well. Figure 9 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 200 can correct the axial aberration well. Figure 10 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 200 can correct chromatic aberration well.

[0132] Example 3

[0133] See also Figure 11, shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S5 of the third lens L3 is convex at the near optical axis; the image-side surface S6 of the third lens L3 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0134] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0135] Table 3-1

[0136]

[0137] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0138] Table 3-2

[0139]

[0140] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are shown as follows: Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 As shown. Figure 12 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct astigmatism well. Figure 13 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 300 can correct the distortion well. Figure 14 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well. Figure 15 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 300 can correct chromatic aberration well.

[0141] Example 4

[0142] See also Figure 16 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment is that 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 400 in Example 4 are shown in Table 4-1.

[0144] Table 4-1

[0145]

[0146] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0147] Table 4-2

[0148]

[0149] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 400 are shown as follows: Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 As shown. Figure 17 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct astigmatism well. Figure 18 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 400 can correct the distortion well. Figure 19 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 400 can correct the axial aberration well. Figure 20 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 400 can correct chromatic aberration well.

[0150] Example 5

[0151] See also Figure 21 , shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S6 of the third lens L3 is concave at the near optical axis; the object-side surface S13 of the seventh lens L7 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0152] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0153] Table 5-1

[0154]

[0155] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0156] Table 5-2

[0157]

[0158] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 500 are shown as follows: Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 As shown. Figure 22 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 500 can correct the astigmatism well. Figure 23 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 500 can correct the distortion well. Figure 24 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 500 can correct the axial aberration well. Figure 25 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 500 can correct chromatic aberration well.

[0159] Example 6

[0160] See also Figure 26 , shown is a schematic structural diagram 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 image-side surface S6 of the third lens L3 is concave at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave; and the object-side surface S13 of the seventh lens L7 is convex; and the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0161] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0162] Table 6-1

[0163]

[0164] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0165] Table 6-2

[0166]

[0167] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 600 are shown as follows: Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 As shown. Figure 27It 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 600 can correct astigmatism well. Figure 28 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 600 can correct the distortion well. Figure 29 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 600 can correct the axial aberration well. Figure 30 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens 600 can correct chromatic aberration well.

[0168] Example 7

[0169] See also Figure 31 , shown is a schematic structural diagram of an optical lens 700 provided in Example 7 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S11 of the sixth lens L6 is convex at the near optical axis; the image-side surface S12 of the sixth lens L6 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0170] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0171] Table 7-1

[0172]

[0173] The surface parameters of the aspheric lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0174] Table 7-2

[0175]

[0176] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 700 are shown as follows: Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 As shown. Figure 32 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 700 can correct astigmatism well. Figure 33 It can be seen from the figure that the distortion value is controlled within ±1%, indicating that the optical lens 700 can correct the distortion well. Figure 34 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 700 can correct the axial aberration well. Figure 35It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens 700 can correct chromatic aberration well.

[0177] Please refer to Table 8, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, chief ray incidence angle CRA at the maximum image height, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0178] Table 8

[0179]

[0180] In summary of the above embodiments, the optical lens provided by the present invention adopts a seven-piece glass-plastic hybrid structure. Through the specific surface shape setting and reasonable optical focal length distribution, the optical lens structure is relatively compact, effectively shortening the overall length of the optical lens, which is conducive to miniaturization. It has a large aperture value, which enables the lens to achieve high-definition imaging even in dark environments. At the same time, it has a large imaging surface, which can match larger-sized chips to achieve high-definition imaging. It also has the characteristics of long focus and short depth of field, which can better blur the background and highlight the subject when shooting distant scenes or people. In addition, it can also reasonably correct the overall aberration of the optical lens, with the characteristics of small distortion and high pixel count, improving the imaging quality of the optical lens.

[0181] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0182] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with negative optical power; A fourth lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fifth lens with positive optical power, whose image side is convex; A sixth lens with negative optical power; A seventh lens with negative optical power, whose image side is concave near the optical axis; Wherein, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.3 < IH / f < 1.6; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -25 < f3 / f < -5; the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -28 < f4 / f < -2; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8 < TTL / IH ≤ 0.

872.

2. The optical lens according to claim 1, wherein: The combined focal length f14 of the first lens, the second lens, the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f14 / f < 1.

6.

3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.85 < f1 / f < 1.05; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.5 < f2 / f < -2.

4. The optical lens according to claim 1, wherein: 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 < R7 / R8 < 1.

7.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 0.

85.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -10 < f6 / f < -1.

8.

7. The optical lens according to claim 1, wherein: 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.

8. The optical lens according to claim 1, wherein: The true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 6mm < IH / Fno < 6.7mm.

9. The optical lens according to claim 1, wherein: The focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.8 < f1 / f7 < -1; the clear aperture DM11 of the object side of the first lens and the clear aperture DM72 of the image side of the seventh lens satisfy: 0.37 < DM11 / DM72 < 0.47.

Images