Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface; and the seventh lens has negative focal power, and the image side surface of the seventh lens is a concave surface near the optical axis. According to the optical lens provided by the invention, through specific surface shape setting and reasonable focal power distribution, the overall aberration of the optical lens can be reasonably corrected, so that the optical lens has one or more advantages of large aperture, miniaturization, high imaging quality and the like.

Description

Technical Field

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

[0002] With the rapid development of electronic devices (such as laptops, tablets, mobile phones, etc.), electronic devices that can be used for imaging have been rapidly popularized in modern video conferences. With the miniaturization development of various electronic devices, the demand for miniaturization of optical lenses provided in electronic devices has become increasingly intense. However, traditional optical lenses used in video conferences often have a relatively large volume and can no longer meet the requirements of miniaturization of electronic devices. Moreover, the imaging picture quality of traditional optical lenses is poor, especially the images and videos taken in a dim environment have poor quality and cannot meet the requirements of high-definition imaging for video conferences. How to make the imaging lens used in video conferences take into account both miniaturization and high picture quality has become a difficult problem to be solved urgently at present. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an optical lens, which has one or more advantages such as a large aperture, miniaturization, and high imaging quality.

[0004] The technical solution adopted by the present invention is as follows: An optical lens, comprising a total of seven lenses, which sequentially include from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, the object side surface of which is convex and the image side surface of which is concave; A second lens with a positive optical power, the object side surface of which is concave and the image side surface of which is convex; A third lens with a positive optical power, the object side surface of which is convex and the image side surface of which is convex; A fourth lens with a negative optical power; A fifth lens with a positive optical power; A sixth lens with a negative optical power, the object side surface of which is concave; A seventh lens with a negative optical power, the image side surface of which is concave near the optical axis; Wherein, the minimum edge thickness value ETmin among the first lens to the seventh lens and the maximum edge thickness value ETmax among the first lens to the seventh lens satisfy: 2.4 < ETmax / ETmin < 7.3.

[0005] Further preferably, 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: 4 < IH / EPD < 4.6.

[0006] Further preferably, the maximum field of view angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3 < FOV / CRA < 3.3.

[0007] More preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -4.8 < f1 / f < -2.8.

[0008] More preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 2.6 < f2 / f < 4.5.

[0009] More preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -3 < f4 / f < -1.2.

[0010] More preferably, the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 < f37 / f < 1.5.

[0011] More preferably, the central thickness CT1 of the first lens on the optical axis and the sagittal height SAGX11 corresponding to the maximum clear aperture radius at the object side end of the first lens satisfy: 0.7 < SAGX11 / CT1 < 1.2.

[0012] More preferably, the distance CT12 between the first lens and the second lens on the optical axis and the overall optical length TTL of the optical lens satisfy: 0.1 < CT12 / TTL < 0.2.

[0013] More preferably, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1 < (ET1 + ET2) / (CT1 + CT2) < 1.2.

[0014] 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 a large image height of the lens, can be paired with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; it makes the lens have a large aperture and can achieve high-definition imaging even in a dim environment; 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where: Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 It is the astigmatism curve graph of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 It is the axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 It is the structural schematic diagram of the optical lens in Embodiment 2 of the present invention.

[0020] Figure 6 It is the astigmatism curve graph of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 It is the axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 It is the structural schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0024] Figure 10 It is the astigmatism curve graph of the optical lens in Embodiment 3 of the present invention.

[0025] Figure 11 It is the axial aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 It is the structural schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0028] Figure 14 It is the astigmatism curve graph of the optical lens in Embodiment 4 of the present invention.

[0029] Figure 15 It is the axial aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0030] Figure 16 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 17 It is the structural schematic diagram of the optical lens in Embodiment 5 of the present invention.

[0032] Figure 18 It is the astigmatism curve graph of the optical lens in Embodiment 5 of the present invention.

[0033] Figure 19 It is the axial aberration curve diagram of the optical lens in Embodiment 5 of the present invention.

[0034] Figure 20 It is the lateral chromatic aberration curve diagram of the optical lens in Embodiment 5 of the present invention.

[0035] Figure 21 It is the structural schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0036] Figure 22 It is the astigmatism curve diagram of the optical lens in Embodiment 6 of the present invention.

[0037] Figure 23 It is the axial aberration curve diagram of the optical lens in Embodiment 6 of the present invention.

[0038] Figure 24 It is the lateral chromatic aberration curve diagram of the optical lens in Embodiment 6 of the present invention.

[0039] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0040] To better understand the present application, more detailed descriptions will be made for 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 do not 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.

[0041] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. 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 spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0043] In this document, 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 being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0044] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, denote 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. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. Further, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0047] The optical lens provided by the embodiment of the present invention has a total of seven lenses, which are, 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.

[0048] In some embodiments, the first lens may have a negative optical power, its object side surface is convex, and its image side surface is concave. The second lens may have a positive optical power, its object side surface is concave, and its image side surface is convex. The third lens may have a positive optical power, its object side surface is convex, and its image side surface is convex. The fourth lens may have a negative optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The fifth lens may have a positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The sixth lens may have a negative optical power, its object side surface is concave, and its image side surface may be concave or convex. The seventh lens may have a negative optical power, its object side surface may be concave or convex, and its image side surface is concave near the optical axis.

[0049] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the imaging.

[0050] In some embodiments, the optical lens may further include a filter, and the filter may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0051] In some embodiments, the minimum edge thickness value ETmin among the first lens to the seventh lens and the maximum edge thickness value ETmax among the first lens to the seventh lens satisfy: 2.4 < ETmax / ETmin < 7.3. By satisfying the above conditional formula, since the thickness of each lens has a great influence on the total length of the optical lens, in order to achieve the miniaturized design of the optical lens, the ratio of the maximum edge thickness value of the seven lenses of the optical lens to the minimum edge thickness value of the seven lenses of the optical lens is controlled to reduce the total length of the optical lens, and it helps to reduce the distortion and aberration of the optical lens, and can improve the imaging quality of the optical lens.

[0052] 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: 4 < IH / EPD < 4.6. By satisfying the above conditional formula, an optical lens with a large image plane can have a large entrance pupil diameter and a high light transmittance, thereby increasing the imaging effect when the optical lens works in a dark environment, and reducing the aberration of the edge field of view.

[0053] In some embodiments, the maximum field of view angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3 < FOV / CRA < 3.3. By satisfying the above conditional formula, by limiting the ratio of the field of view angle to the chief ray angle of incidence, the optical lens has a large field of view angle to meet the requirements of large field of view angles of electronic devices such as mobile phones and laptop computers. At the same time, reducing the angle of the chief ray incident on the imaging surface can improve the photosensitive performance of the photosensitive element and is beneficial to improving the imaging quality of the optical lens.

[0054] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -4.8 < f1 / f < -2.8. By satisfying the above conditional formula, setting the first lens of the optical lens as a lens with a negative optical power can capture the light rays entering the optical lens at large angles, expanding the field of view angle range of the optical lens; at the same time, it is also beneficial to reduce the sensitivity of the optical lens and achieve the miniaturized design of the optical lens.

[0055] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 2.6 < f2 / f < 4.5. Meeting the above conditional formula is conducive to cooperating with the first lens to make large-angle light incident on the optical lens, thereby expanding the field of view angle of the optical lens. At the same time, it is also conducive to correcting the astigmatism and chromatic aberration of the optical lens and improving the imaging quality of the optical lens.

[0056] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -3 < f4 / f < -1.2. Meeting the above conditional formula, as the middle lens of the imaging lens group, the negative refractive power provided by the fourth lens for the optical lens can better constrain the light beam, so it can be used to correct the chromatic aberration of the optical lens. At the same time, it can perform intermediate correction on the aberration generated by the decentration difference of each lens on the object side and reduce the correction pressure of the subsequent lens group.

[0057] In some embodiments, the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 < f37 / f < 1.5. Meeting the above conditional formula can reasonably configure the proportion of the combined focal length of the third lens to the seventh lens in the effective focal length of the optical lens, which is conducive to the reasonable transition of light between the third lens and the seventh lens. Thus, it is beneficial to reduce the height of the light beam exiting the optical lens, ensure the reduction of the aberration of the optical lens and the effective aperture of each lens in the third lens to the seventh lens, and meet the requirements of miniaturization design.

[0058] In some embodiments, the central thickness CT1 of the first lens on the optical axis and the sagittal height SAGX11 corresponding to the maximum clear aperture radius at the object side end of the first lens satisfy: 0.7 < SAGX11 / CT1 < 1.2. Meeting the above conditional formula, by controlling the ratio of the sagittal height of the object side surface of the first lens to the central thickness of the first lens on the optical axis, the surface shape of the object side surface can be made to tend to be curved; at the same time, a larger sagittal height is beneficial for the first lens to collect large-field light, achieve high angular resolution at the center of the optical lens, and further improve the imaging quality of the central region.

[0059] In some embodiments, the spacing CT12 between the first lens and the second lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.1 < CT12 / TTL < 0.2. Meeting the above conditional formula, by reasonably configuring the air gap between the first lens and the second lens and adjusting the total length of the optical lens at the same time, the optical lens can be made more compact, so as to ensure the imaging effect of the optical lens while reducing the decentration risk of the lens.

[0060] In some embodiments, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 1 < (ET1 + ET2) / (CT1 + CT2) < 1.2. Satisfying the above relational expression, the sum of the edge thicknesses of the first lens and the second lens is greater than the sum of the central thicknesses, which is conducive to smoothing the large-angle incident light and will not bring the pressure of aberration correction to the subsequent lenses, reducing the sensitivity of the optical lens.

[0061] In some embodiments, the overall optical length TTL of the optical lens and the f-number Fno of the optical lens satisfy: 5.1 mm < TTL / Fno < 6.4 mm. Satisfying the above conditional expression, by controlling the relationship between the overall length and the f-number of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturization design, enabling the optical lens to obtain sufficient light transmission in a dim environment and meeting the needs of high-quality and high-definition shooting.

[0062] In some embodiments, the effective focal length f of the optical lens and the f-number Fno of the optical lens satisfy: 2.1 mm < f / Fno < 2.5 mm. Satisfying the above conditional expression can ensure that the optical lens with a long focal length obtains more light input, realizes the characteristics of a large aperture, and makes the scenery captured by the optical lens brighter, improving the imaging quality.

[0063] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: -0.3 < R1 / f1 < -0.1. Satisfying the above conditional expression enables the optical lens to capture the large-angle incident light, reduces the sensitivity of the optical lens, and realizes the characteristics of miniaturization; at the same time, it can avoid the object side surface of the first lens from being too curved, reduce the sensitivity of assembly eccentricity, and improve the yield.

[0064] In some embodiments, the curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens satisfy: -0.15 < R2 / f1 < -0.05. Satisfying the above conditional expression controls the curvature radius of the image side surface of the first lens within a certain range. Most of the light rays emitted from the first lens enter the object side surface of the second lens, and the light rays are overly smooth, which is conducive to reducing light energy loss. At the same time, the light rays enter the rear lens smoothly with less aberration, which is conducive to achieving high resolution.

[0065] In some embodiments, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f1 of the first lens satisfy: -5.5 < f1 / (R1 + R2) < -2.5. Satisfying the above conditional formula can constrain the surface shapes of the object side surface and the image side surface of the first lens, which is beneficial to reducing the bending degree of light rays at the image side surface of the first lens and reducing the astigmatism of the optical lens, so as to balance the astigmatism problem brought by the large field of view angle of the optical lens, so that when the optical lens has a large field of view, the astigmatism will not be too large, thereby ensuring that the optical lens has excellent imaging quality.

[0066] In some embodiments, the optical lens satisfies the conditional formula: 11.6 mm < TTL < 12.7 mm; 4.6 mm < f < 5.1 mm; 115° < FOV < 125°; 2.1 mm < EPD < 2.5 mm; 1.9 < Fno < 2.4; 9.5 mm < IH < 10.2 mm; 3 mm < CSD11 < 3.5 mm; 2.1 mm < CSD12 < 2.6 mm; where TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CSD11 represents the clear aperture radius of the object side end of the first lens, and CSD12 represents the clear aperture radius of the image side end of the first lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least one or more of the advantages of miniaturization, large aperture, small aperture, large field of view angle, high pixel, and large image height.

[0067] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The 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 enables the structure of the lens to be relatively compact, and can better achieve the balance of miniaturization and high image quality of the lens.

[0068] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may be spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention can all 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 realizing the miniaturization of the lens.

[0069] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation: ; 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, and H are the conic coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively.

[0070] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are partially different. For specific differences, please refer to the parameter tables of each embodiment. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing 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.

[0071] Embodiment 1 Please refer to Figure 1 , which shows a schematic structural diagram of an optical lens 100 provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0072] Among them, the first lens L1 has a negative optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface; The second lens L2 has a positive optical power. Its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface; The third lens L3 has a positive optical power. Its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface; The fourth lens L4 has a negative optical power. Its object side surface S7 is a convex surface near the optical axis, and its image side surface S8 is a concave surface; The fifth lens L5 has a positive focal power, its object side S9 is concave, and its image side S10 is convex; The sixth lens L6 has a negative focal power, its object side S11 is concave, and its image side S12 is concave; The seventh lens L7 has a negative focal power, its object side S13 is convex near the optical axis, and its image side S14 is concave near the optical axis; Both the object side S15 and the image side S16 of the filter G1 are flat; The imaging surface S17 is flat.

[0073] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspherical lenses.

[0074] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0075] Table 1-1 The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0076] Table 1-2 In this embodiment, the astigmatism curve graph, the axial aberration curve graph, and the lateral chromatic aberration curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 shown.

[0077] Figure 2 shows the astigmatism curve graph of Embodiment 1, which represents the astigmatism of light rays 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 angle (unit: °). It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 100 can well correct astigmatism.

[0078] Figure 3 shows the axial aberration curve graph of Embodiment 1 of the present invention, 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 ±0.04 mm, indicating that the optical lens 100 can better correct the axial aberration.

[0079] Figure 4The vertical chromatic aberration curve diagram of Embodiment 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value (unit: μm) of each wavelength relative to the central wavelength, and the vertical axis represents the field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can excellently correct the chromatic aberration of each field of view.

[0080] Embodiment 2 Please refer to Figure 5 , which shows the structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side surface S7 of the fourth lens L4 is concave; the image side surface S8 of the fourth lens L4 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0081] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0082] Table 2-1 The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0083] Table 2-2 In this embodiment, the astigmatism curve diagram, axial aberration curve diagram, and vertical chromatic aberration curve diagram of the optical lens 200 are respectively as shown in Figure 6 , Figure 7 , Figure 8 .

[0084] From Figure 6 , it can be seen that the astigmatism between the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can well correct astigmatism.

[0085] From Figure 7 , it can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 200 can better correct the axial aberration.

[0086] From Figure 8 , it can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can excellently correct the chromatic aberration of each field of view.

[0087] Embodiment 3 Please refer to Figure 9, which shows a schematic structural diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main differences are as follows: The object side surface S9 of the fifth lens L5 is a convex surface; the image side surface S10 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0088] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0089] Table 3-1 The surface type parameters of the aspherical lenses in the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0090] Table 3-2 In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 300 are respectively as Figure 10 , Figure 11 , Figure 12 shown.

[0091] From Figure 10 it can be seen that the astigmatism between 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.

[0092] From Figure 11 it can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration better.

[0093] From Figure 12 it can be seen that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2.5 μm, indicating that the optical lens 300 can correct the chromatic aberration of each field of view extremely well.

[0094] Embodiment 4 Please refer to Figure 13 , which shows a schematic structural diagram of the optical lens 400 provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main differences are as follows: The object side surface S7 of the fourth lens L4 is a concave surface; the image side surface S12 of the sixth lens L6 is a convex surface near the optical axis; the object side surface S13 of the seventh lens L7 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0095] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0096] Table 4-1 The surface type parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0097] Table 4-2 In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 400 are respectively as Figure 14 , Figure 15 , Figure 16 shown.

[0098] From Figure 14 , it can be seen that the astigmatism between 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.

[0099] From Figure 15 , it can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 400 can correct the axial aberration better.

[0100] From Figure 16 , it can be seen that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 400 can correct the chromatic aberration of each field of view extremely well.

[0101] Embodiment 5 Please refer to Figure 17 , which shows the structural schematic diagram of the optical lens 500 provided in Embodiment 5 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side surface S7 of the fourth lens L4 is a concave surface; the object side surface S9 of the fifth lens L5 is a convex surface; the image side surface S10 of the fifth lens L5 is a concave surface; the object side surface S13 of the seventh lens L7 is a concave surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 500 in Embodiment 5 are shown in Table 5-1.

[0103] Table 5-1 The surface type parameters of the aspherical lens of the optical lens 500 in Embodiment 5 are shown in Table 5-2.

[0104] Table 5-2 In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 500 are respectively as Figure 18 , Figure 19 , Figure 20 shown.

[0105] From Figure 18It can be seen that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 500 can correct astigmatism well.

[0106] From Figure 19 it can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 500 can correct axial aberration well.

[0107] From Figure 20 it can be seen that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 500 can correct chromatic aberration of each field of view extremely well.

[0108] Embodiment 6 Please refer to Figure 21 , which shows a schematic structural diagram of the optical lens 600 provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main differences are: the object side surface S7 of the fourth lens L4 is concave; the image side surface S8 of the fourth lens L4 is convex; the object side surface S9 of the fifth lens L5 is convex; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0109] The relevant parameters of each lens in the optical lens 600 in Embodiment 6 are shown in Table 6-1.

[0110] Table 6-1 The surface type parameters of the aspherical lenses of the optical lens 600 in Embodiment 6 are shown in Table 6-2.

[0111] Table 6-2 In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 600 are respectively as Figure 22 , Figure 23 , Figure 24 shown.

[0112] From Figure 22 it can be seen that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 600 can correct astigmatism well.

[0113] From Figure 23 it can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 600 can correct axial aberration well.

[0114] From Figure 24 it can be seen that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 600 can correct chromatic aberration of each field of view extremely well.

[0115] Please refer to Table 7 for 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 true image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, the chief ray angle of incidence CRA at the maximum image height, and the values corresponding to each conditional formula in each embodiment.

[0116] Table 7 In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages: The optical lens provided by the present invention, through specific surface shape settings and reasonable optical power distribution, makes the lens have a small volume; it can also achieve a large image height of the lens, can be paired with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; makes the lens have a large aperture, and can achieve high-definition imaging even in a dim environment; 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.

[0117] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0118] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: The first lens has a negative optical power, the object side surface of which is convex, and the image side surface of which is concave; The second lens has positive refractive power, its object side surface is concave and its image side surface is convex; The third lens has positive power, its object side surface is convex, and its image side surface is convex; a fourth lens having negative optical power; a fifth lens having positive refractive power; a sixth lens having negative optical power, whose object side surface is concave; The seventh lens element has a negative optical power and its image side surface is concave at the near optical axis; The minimum edge thickness value ETmin among the first lens to the seventh lens and the maximum edge thickness value ETmax among the first lens to the seventh lens satisfy: 2.4 <ETmax / ETmin<7.3。 2. The optical lens according to claim 1, characterized in that: The real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4 <IH / EPD<4.6。 3. The optical lens according to claim 1, characterized in that: The maximum field of view FOV of the optical lens and the chief ray incident angle CRA at the maximum image height of the optical lens satisfy: 3 <FOV / CRA<3.3。 4. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -4.8 <f1 / f<-2.8。 5. The optical lens according to claim 1, characterized in that: The focal length f2 of the second lens satisfies the effective focal length f of the optical lens: 2.6 <f2 / f<4.5。 6. The optical lens according to claim 1, characterized in that: The focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: <f4 / f<-1.2。 7. The optical lens according to claim 1, characterized in that: The combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 <f37 / f<1.5。 8. The optical lens according to claim 1, characterized in that: The center thickness CT1 of the first lens on the optical axis and the vector height SAGX11 corresponding to the maximum light semi-aperture of the object side end of the first lens satisfy: 0.7 <SAGX11 / CT1<1.2。 9. The optical lens according to claim 1, characterized in that: The distance CT12 between the first lens and the second lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.1 <CT12 / TTL<0.2。 10. The optical lens according to claim 1, characterized in that: The edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 1<(ET1+ET2) / (CT1+CT2)<1.2.

Images